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TOMOYO Linux Cross Reference
Linux/arch/powerpc/xmon/xmon.c

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  1 /*
  2  * Routines providing a simple monitor for use on the PowerMac.
  3  *
  4  * Copyright (C) 1996-2005 Paul Mackerras.
  5  * Copyright (C) 2001 PPC64 Team, IBM Corp
  6  * Copyrignt (C) 2006 Michael Ellerman, IBM Corp
  7  *
  8  *      This program is free software; you can redistribute it and/or
  9  *      modify it under the terms of the GNU General Public License
 10  *      as published by the Free Software Foundation; either version
 11  *      2 of the License, or (at your option) any later version.
 12  */
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/errno.h>
 16 #include <linux/sched/signal.h>
 17 #include <linux/smp.h>
 18 #include <linux/mm.h>
 19 #include <linux/reboot.h>
 20 #include <linux/delay.h>
 21 #include <linux/kallsyms.h>
 22 #include <linux/kmsg_dump.h>
 23 #include <linux/cpumask.h>
 24 #include <linux/export.h>
 25 #include <linux/sysrq.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/irq.h>
 28 #include <linux/bug.h>
 29 #include <linux/nmi.h>
 30 #include <linux/ctype.h>
 31 #include <linux/highmem.h>
 32 
 33 #include <asm/debugfs.h>
 34 #include <asm/ptrace.h>
 35 #include <asm/smp.h>
 36 #include <asm/string.h>
 37 #include <asm/prom.h>
 38 #include <asm/machdep.h>
 39 #include <asm/xmon.h>
 40 #include <asm/processor.h>
 41 #include <asm/pgtable.h>
 42 #include <asm/mmu.h>
 43 #include <asm/mmu_context.h>
 44 #include <asm/cputable.h>
 45 #include <asm/rtas.h>
 46 #include <asm/sstep.h>
 47 #include <asm/irq_regs.h>
 48 #include <asm/spu.h>
 49 #include <asm/spu_priv1.h>
 50 #include <asm/setjmp.h>
 51 #include <asm/reg.h>
 52 #include <asm/debug.h>
 53 #include <asm/hw_breakpoint.h>
 54 #include <asm/xive.h>
 55 #include <asm/opal.h>
 56 #include <asm/firmware.h>
 57 #include <asm/code-patching.h>
 58 
 59 #ifdef CONFIG_PPC64
 60 #include <asm/hvcall.h>
 61 #include <asm/paca.h>
 62 #endif
 63 
 64 #if defined(CONFIG_PPC_SPLPAR)
 65 #include <asm/plpar_wrappers.h>
 66 #else
 67 static inline long plapr_set_ciabr(unsigned long ciabr) {return 0; };
 68 #endif
 69 
 70 #include "nonstdio.h"
 71 #include "dis-asm.h"
 72 
 73 #ifdef CONFIG_SMP
 74 static cpumask_t cpus_in_xmon = CPU_MASK_NONE;
 75 static unsigned long xmon_taken = 1;
 76 static int xmon_owner;
 77 static int xmon_gate;
 78 #else
 79 #define xmon_owner 0
 80 #endif /* CONFIG_SMP */
 81 
 82 static unsigned long in_xmon __read_mostly = 0;
 83 static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT);
 84 
 85 static unsigned long adrs;
 86 static int size = 1;
 87 #define MAX_DUMP (128 * 1024)
 88 static unsigned long ndump = 64;
 89 static unsigned long nidump = 16;
 90 static unsigned long ncsum = 4096;
 91 static int termch;
 92 static char tmpstr[128];
 93 static int tracing_enabled;
 94 
 95 static long bus_error_jmp[JMP_BUF_LEN];
 96 static int catch_memory_errors;
 97 static int catch_spr_faults;
 98 static long *xmon_fault_jmp[NR_CPUS];
 99 
100 /* Breakpoint stuff */
101 struct bpt {
102         unsigned long   address;
103         unsigned int    instr[2];
104         atomic_t        ref_count;
105         int             enabled;
106         unsigned long   pad;
107 };
108 
109 /* Bits in bpt.enabled */
110 #define BP_CIABR        1
111 #define BP_TRAP         2
112 #define BP_DABR         4
113 
114 #define NBPTS   256
115 static struct bpt bpts[NBPTS];
116 static struct bpt dabr;
117 static struct bpt *iabr;
118 static unsigned bpinstr = 0x7fe00008;   /* trap */
119 
120 #define BP_NUM(bp)      ((bp) - bpts + 1)
121 
122 /* Prototypes */
123 static int cmds(struct pt_regs *);
124 static int mread(unsigned long, void *, int);
125 static int mwrite(unsigned long, void *, int);
126 static int handle_fault(struct pt_regs *);
127 static void byterev(unsigned char *, int);
128 static void memex(void);
129 static int bsesc(void);
130 static void dump(void);
131 static void show_pte(unsigned long);
132 static void prdump(unsigned long, long);
133 static int ppc_inst_dump(unsigned long, long, int);
134 static void dump_log_buf(void);
135 
136 #ifdef CONFIG_PPC_POWERNV
137 static void dump_opal_msglog(void);
138 #else
139 static inline void dump_opal_msglog(void)
140 {
141         printf("Machine is not running OPAL firmware.\n");
142 }
143 #endif
144 
145 static void backtrace(struct pt_regs *);
146 static void excprint(struct pt_regs *);
147 static void prregs(struct pt_regs *);
148 static void memops(int);
149 static void memlocate(void);
150 static void memzcan(void);
151 static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned);
152 int skipbl(void);
153 int scanhex(unsigned long *valp);
154 static void scannl(void);
155 static int hexdigit(int);
156 void getstring(char *, int);
157 static void flush_input(void);
158 static int inchar(void);
159 static void take_input(char *);
160 static int  read_spr(int, unsigned long *);
161 static void write_spr(int, unsigned long);
162 static void super_regs(void);
163 static void remove_bpts(void);
164 static void insert_bpts(void);
165 static void remove_cpu_bpts(void);
166 static void insert_cpu_bpts(void);
167 static struct bpt *at_breakpoint(unsigned long pc);
168 static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp);
169 static int  do_step(struct pt_regs *);
170 static void bpt_cmds(void);
171 static void cacheflush(void);
172 static int  cpu_cmd(void);
173 static void csum(void);
174 static void bootcmds(void);
175 static void proccall(void);
176 static void show_tasks(void);
177 void dump_segments(void);
178 static void symbol_lookup(void);
179 static void xmon_show_stack(unsigned long sp, unsigned long lr,
180                             unsigned long pc);
181 static void xmon_print_symbol(unsigned long address, const char *mid,
182                               const char *after);
183 static const char *getvecname(unsigned long vec);
184 
185 static int do_spu_cmd(void);
186 
187 #ifdef CONFIG_44x
188 static void dump_tlb_44x(void);
189 #endif
190 #ifdef CONFIG_PPC_BOOK3E
191 static void dump_tlb_book3e(void);
192 #endif
193 
194 #ifdef CONFIG_PPC64
195 #define REG             "%.16lx"
196 #else
197 #define REG             "%.8lx"
198 #endif
199 
200 #ifdef __LITTLE_ENDIAN__
201 #define GETWORD(v)      (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0])
202 #else
203 #define GETWORD(v)      (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
204 #endif
205 
206 static char *help_string = "\
207 Commands:\n\
208   b     show breakpoints\n\
209   bd    set data breakpoint\n\
210   bi    set instruction breakpoint\n\
211   bc    clear breakpoint\n"
212 #ifdef CONFIG_SMP
213   "\
214   c     print cpus stopped in xmon\n\
215   c#    try to switch to cpu number h (in hex)\n"
216 #endif
217   "\
218   C     checksum\n\
219   d     dump bytes\n\
220   d1    dump 1 byte values\n\
221   d2    dump 2 byte values\n\
222   d4    dump 4 byte values\n\
223   d8    dump 8 byte values\n\
224   di    dump instructions\n\
225   df    dump float values\n\
226   dd    dump double values\n\
227   dl    dump the kernel log buffer\n"
228 #ifdef CONFIG_PPC_POWERNV
229   "\
230   do    dump the OPAL message log\n"
231 #endif
232 #ifdef CONFIG_PPC64
233   "\
234   dp[#] dump paca for current cpu, or cpu #\n\
235   dpa   dump paca for all possible cpus\n"
236 #endif
237   "\
238   dr    dump stream of raw bytes\n\
239   dv    dump virtual address translation \n\
240   dt    dump the tracing buffers (uses printk)\n\
241   dtc   dump the tracing buffers for current CPU (uses printk)\n\
242 "
243 #ifdef CONFIG_PPC_POWERNV
244 "  dx#   dump xive on CPU #\n\
245   dxi#  dump xive irq state #\n\
246   dxa   dump xive on all CPUs\n"
247 #endif
248 "  e    print exception information\n\
249   f     flush cache\n\
250   la    lookup symbol+offset of specified address\n\
251   ls    lookup address of specified symbol\n\
252   m     examine/change memory\n\
253   mm    move a block of memory\n\
254   ms    set a block of memory\n\
255   md    compare two blocks of memory\n\
256   ml    locate a block of memory\n\
257   mz    zero a block of memory\n\
258   mi    show information about memory allocation\n\
259   p     call a procedure\n\
260   P     list processes/tasks\n\
261   r     print registers\n\
262   s     single step\n"
263 #ifdef CONFIG_SPU_BASE
264 "  ss   stop execution on all spus\n\
265   sr    restore execution on stopped spus\n\
266   sf  # dump spu fields for spu # (in hex)\n\
267   sd  # dump spu local store for spu # (in hex)\n\
268   sdi # disassemble spu local store for spu # (in hex)\n"
269 #endif
270 "  S    print special registers\n\
271   Sa    print all SPRs\n\
272   Sr #  read SPR #\n\
273   Sw #v write v to SPR #\n\
274   t     print backtrace\n\
275   x     exit monitor and recover\n\
276   X     exit monitor and don't recover\n"
277 #if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E)
278 "  u    dump segment table or SLB\n"
279 #elif defined(CONFIG_PPC_STD_MMU_32)
280 "  u    dump segment registers\n"
281 #elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E)
282 "  u    dump TLB\n"
283 #endif
284 "  U    show uptime information\n"
285 "  ?    help\n"
286 "  # n  limit output to n lines per page (for dp, dpa, dl)\n"
287 "  zr   reboot\n\
288   zh    halt\n"
289 ;
290 
291 static struct pt_regs *xmon_regs;
292 
293 static inline void sync(void)
294 {
295         asm volatile("sync; isync");
296 }
297 
298 static inline void store_inst(void *p)
299 {
300         asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p));
301 }
302 
303 static inline void cflush(void *p)
304 {
305         asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p));
306 }
307 
308 static inline void cinval(void *p)
309 {
310         asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p));
311 }
312 
313 /**
314  * write_ciabr() - write the CIABR SPR
315  * @ciabr:      The value to write.
316  *
317  * This function writes a value to the CIARB register either directly
318  * through mtspr instruction if the kernel is in HV privilege mode or
319  * call a hypervisor function to achieve the same in case the kernel
320  * is in supervisor privilege mode.
321  */
322 static void write_ciabr(unsigned long ciabr)
323 {
324         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
325                 return;
326 
327         if (cpu_has_feature(CPU_FTR_HVMODE)) {
328                 mtspr(SPRN_CIABR, ciabr);
329                 return;
330         }
331         plapr_set_ciabr(ciabr);
332 }
333 
334 /**
335  * set_ciabr() - set the CIABR
336  * @addr:       The value to set.
337  *
338  * This function sets the correct privilege value into the the HW
339  * breakpoint address before writing it up in the CIABR register.
340  */
341 static void set_ciabr(unsigned long addr)
342 {
343         addr &= ~CIABR_PRIV;
344 
345         if (cpu_has_feature(CPU_FTR_HVMODE))
346                 addr |= CIABR_PRIV_HYPER;
347         else
348                 addr |= CIABR_PRIV_SUPER;
349         write_ciabr(addr);
350 }
351 
352 /*
353  * Disable surveillance (the service processor watchdog function)
354  * while we are in xmon.
355  * XXX we should re-enable it when we leave. :)
356  */
357 #define SURVEILLANCE_TOKEN      9000
358 
359 static inline void disable_surveillance(void)
360 {
361 #ifdef CONFIG_PPC_PSERIES
362         /* Since this can't be a module, args should end up below 4GB. */
363         static struct rtas_args args;
364         int token;
365 
366         /*
367          * At this point we have got all the cpus we can into
368          * xmon, so there is hopefully no other cpu calling RTAS
369          * at the moment, even though we don't take rtas.lock.
370          * If we did try to take rtas.lock there would be a
371          * real possibility of deadlock.
372          */
373         token = rtas_token("set-indicator");
374         if (token == RTAS_UNKNOWN_SERVICE)
375                 return;
376 
377         rtas_call_unlocked(&args, token, 3, 1, NULL, SURVEILLANCE_TOKEN, 0, 0);
378 
379 #endif /* CONFIG_PPC_PSERIES */
380 }
381 
382 #ifdef CONFIG_SMP
383 static int xmon_speaker;
384 
385 static void get_output_lock(void)
386 {
387         int me = smp_processor_id() + 0x100;
388         int last_speaker = 0, prev;
389         long timeout;
390 
391         if (xmon_speaker == me)
392                 return;
393 
394         for (;;) {
395                 last_speaker = cmpxchg(&xmon_speaker, 0, me);
396                 if (last_speaker == 0)
397                         return;
398 
399                 /*
400                  * Wait a full second for the lock, we might be on a slow
401                  * console, but check every 100us.
402                  */
403                 timeout = 10000;
404                 while (xmon_speaker == last_speaker) {
405                         if (--timeout > 0) {
406                                 udelay(100);
407                                 continue;
408                         }
409 
410                         /* hostile takeover */
411                         prev = cmpxchg(&xmon_speaker, last_speaker, me);
412                         if (prev == last_speaker)
413                                 return;
414                         break;
415                 }
416         }
417 }
418 
419 static void release_output_lock(void)
420 {
421         xmon_speaker = 0;
422 }
423 
424 int cpus_are_in_xmon(void)
425 {
426         return !cpumask_empty(&cpus_in_xmon);
427 }
428 
429 static bool wait_for_other_cpus(int ncpus)
430 {
431         unsigned long timeout;
432 
433         /* We wait for 2s, which is a metric "little while" */
434         for (timeout = 20000; timeout != 0; --timeout) {
435                 if (cpumask_weight(&cpus_in_xmon) >= ncpus)
436                         return true;
437                 udelay(100);
438                 barrier();
439         }
440 
441         return false;
442 }
443 #endif /* CONFIG_SMP */
444 
445 static inline int unrecoverable_excp(struct pt_regs *regs)
446 {
447 #if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E)
448         /* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */
449         return 0;
450 #else
451         return ((regs->msr & MSR_RI) == 0);
452 #endif
453 }
454 
455 static int xmon_core(struct pt_regs *regs, int fromipi)
456 {
457         int cmd = 0;
458         struct bpt *bp;
459         long recurse_jmp[JMP_BUF_LEN];
460         unsigned long offset;
461         unsigned long flags;
462 #ifdef CONFIG_SMP
463         int cpu;
464         int secondary;
465 #endif
466 
467         local_irq_save(flags);
468         hard_irq_disable();
469 
470         tracing_enabled = tracing_is_on();
471         tracing_off();
472 
473         bp = in_breakpoint_table(regs->nip, &offset);
474         if (bp != NULL) {
475                 regs->nip = bp->address + offset;
476                 atomic_dec(&bp->ref_count);
477         }
478 
479         remove_cpu_bpts();
480 
481 #ifdef CONFIG_SMP
482         cpu = smp_processor_id();
483         if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
484                 /*
485                  * We catch SPR read/write faults here because the 0x700, 0xf60
486                  * etc. handlers don't call debugger_fault_handler().
487                  */
488                 if (catch_spr_faults)
489                         longjmp(bus_error_jmp, 1);
490                 get_output_lock();
491                 excprint(regs);
492                 printf("cpu 0x%x: Exception %lx %s in xmon, "
493                        "returning to main loop\n",
494                        cpu, regs->trap, getvecname(TRAP(regs)));
495                 release_output_lock();
496                 longjmp(xmon_fault_jmp[cpu], 1);
497         }
498 
499         if (setjmp(recurse_jmp) != 0) {
500                 if (!in_xmon || !xmon_gate) {
501                         get_output_lock();
502                         printf("xmon: WARNING: bad recursive fault "
503                                "on cpu 0x%x\n", cpu);
504                         release_output_lock();
505                         goto waiting;
506                 }
507                 secondary = !(xmon_taken && cpu == xmon_owner);
508                 goto cmdloop;
509         }
510 
511         xmon_fault_jmp[cpu] = recurse_jmp;
512 
513         bp = NULL;
514         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT))
515                 bp = at_breakpoint(regs->nip);
516         if (bp || unrecoverable_excp(regs))
517                 fromipi = 0;
518 
519         if (!fromipi) {
520                 get_output_lock();
521                 excprint(regs);
522                 if (bp) {
523                         printf("cpu 0x%x stopped at breakpoint 0x%lx (",
524                                cpu, BP_NUM(bp));
525                         xmon_print_symbol(regs->nip, " ", ")\n");
526                 }
527                 if (unrecoverable_excp(regs))
528                         printf("WARNING: exception is not recoverable, "
529                                "can't continue\n");
530                 release_output_lock();
531         }
532 
533         cpumask_set_cpu(cpu, &cpus_in_xmon);
534 
535  waiting:
536         secondary = 1;
537         spin_begin();
538         while (secondary && !xmon_gate) {
539                 if (in_xmon == 0) {
540                         if (fromipi) {
541                                 spin_end();
542                                 goto leave;
543                         }
544                         secondary = test_and_set_bit(0, &in_xmon);
545                 }
546                 spin_cpu_relax();
547                 touch_nmi_watchdog();
548         }
549         spin_end();
550 
551         if (!secondary && !xmon_gate) {
552                 /* we are the first cpu to come in */
553                 /* interrupt other cpu(s) */
554                 int ncpus = num_online_cpus();
555 
556                 xmon_owner = cpu;
557                 mb();
558                 if (ncpus > 1) {
559                         /*
560                          * A system reset (trap == 0x100) can be triggered on
561                          * all CPUs, so when we come in via 0x100 try waiting
562                          * for the other CPUs to come in before we send the
563                          * debugger break (IPI). This is similar to
564                          * crash_kexec_secondary().
565                          */
566                         if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
567                                 smp_send_debugger_break();
568 
569                         wait_for_other_cpus(ncpus);
570                 }
571                 remove_bpts();
572                 disable_surveillance();
573                 /* for breakpoint or single step, print the current instr. */
574                 if (bp || TRAP(regs) == 0xd00)
575                         ppc_inst_dump(regs->nip, 1, 0);
576                 printf("enter ? for help\n");
577                 mb();
578                 xmon_gate = 1;
579                 barrier();
580                 touch_nmi_watchdog();
581         }
582 
583  cmdloop:
584         while (in_xmon) {
585                 if (secondary) {
586                         spin_begin();
587                         if (cpu == xmon_owner) {
588                                 if (!test_and_set_bit(0, &xmon_taken)) {
589                                         secondary = 0;
590                                         spin_end();
591                                         continue;
592                                 }
593                                 /* missed it */
594                                 while (cpu == xmon_owner)
595                                         spin_cpu_relax();
596                         }
597                         spin_cpu_relax();
598                         touch_nmi_watchdog();
599                 } else {
600                         cmd = cmds(regs);
601                         if (cmd != 0) {
602                                 /* exiting xmon */
603                                 insert_bpts();
604                                 xmon_gate = 0;
605                                 wmb();
606                                 in_xmon = 0;
607                                 break;
608                         }
609                         /* have switched to some other cpu */
610                         secondary = 1;
611                 }
612         }
613  leave:
614         cpumask_clear_cpu(cpu, &cpus_in_xmon);
615         xmon_fault_jmp[cpu] = NULL;
616 #else
617         /* UP is simple... */
618         if (in_xmon) {
619                 printf("Exception %lx %s in xmon, returning to main loop\n",
620                        regs->trap, getvecname(TRAP(regs)));
621                 longjmp(xmon_fault_jmp[0], 1);
622         }
623         if (setjmp(recurse_jmp) == 0) {
624                 xmon_fault_jmp[0] = recurse_jmp;
625                 in_xmon = 1;
626 
627                 excprint(regs);
628                 bp = at_breakpoint(regs->nip);
629                 if (bp) {
630                         printf("Stopped at breakpoint %lx (", BP_NUM(bp));
631                         xmon_print_symbol(regs->nip, " ", ")\n");
632                 }
633                 if (unrecoverable_excp(regs))
634                         printf("WARNING: exception is not recoverable, "
635                                "can't continue\n");
636                 remove_bpts();
637                 disable_surveillance();
638                 /* for breakpoint or single step, print the current instr. */
639                 if (bp || TRAP(regs) == 0xd00)
640                         ppc_inst_dump(regs->nip, 1, 0);
641                 printf("enter ? for help\n");
642         }
643 
644         cmd = cmds(regs);
645 
646         insert_bpts();
647         in_xmon = 0;
648 #endif
649 
650 #ifdef CONFIG_BOOKE
651         if (regs->msr & MSR_DE) {
652                 bp = at_breakpoint(regs->nip);
653                 if (bp != NULL) {
654                         regs->nip = (unsigned long) &bp->instr[0];
655                         atomic_inc(&bp->ref_count);
656                 }
657         }
658 #else
659         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) {
660                 bp = at_breakpoint(regs->nip);
661                 if (bp != NULL) {
662                         int stepped = emulate_step(regs, bp->instr[0]);
663                         if (stepped == 0) {
664                                 regs->nip = (unsigned long) &bp->instr[0];
665                                 atomic_inc(&bp->ref_count);
666                         } else if (stepped < 0) {
667                                 printf("Couldn't single-step %s instruction\n",
668                                     (IS_RFID(bp->instr[0])? "rfid": "mtmsrd"));
669                         }
670                 }
671         }
672 #endif
673         insert_cpu_bpts();
674 
675         touch_nmi_watchdog();
676         local_irq_restore(flags);
677 
678         return cmd != 'X' && cmd != EOF;
679 }
680 
681 int xmon(struct pt_regs *excp)
682 {
683         struct pt_regs regs;
684 
685         if (excp == NULL) {
686                 ppc_save_regs(&regs);
687                 excp = &regs;
688         }
689 
690         return xmon_core(excp, 0);
691 }
692 EXPORT_SYMBOL(xmon);
693 
694 irqreturn_t xmon_irq(int irq, void *d)
695 {
696         unsigned long flags;
697         local_irq_save(flags);
698         printf("Keyboard interrupt\n");
699         xmon(get_irq_regs());
700         local_irq_restore(flags);
701         return IRQ_HANDLED;
702 }
703 
704 static int xmon_bpt(struct pt_regs *regs)
705 {
706         struct bpt *bp;
707         unsigned long offset;
708 
709         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
710                 return 0;
711 
712         /* Are we at the trap at bp->instr[1] for some bp? */
713         bp = in_breakpoint_table(regs->nip, &offset);
714         if (bp != NULL && offset == 4) {
715                 regs->nip = bp->address + 4;
716                 atomic_dec(&bp->ref_count);
717                 return 1;
718         }
719 
720         /* Are we at a breakpoint? */
721         bp = at_breakpoint(regs->nip);
722         if (!bp)
723                 return 0;
724 
725         xmon_core(regs, 0);
726 
727         return 1;
728 }
729 
730 static int xmon_sstep(struct pt_regs *regs)
731 {
732         if (user_mode(regs))
733                 return 0;
734         xmon_core(regs, 0);
735         return 1;
736 }
737 
738 static int xmon_break_match(struct pt_regs *regs)
739 {
740         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
741                 return 0;
742         if (dabr.enabled == 0)
743                 return 0;
744         xmon_core(regs, 0);
745         return 1;
746 }
747 
748 static int xmon_iabr_match(struct pt_regs *regs)
749 {
750         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
751                 return 0;
752         if (iabr == NULL)
753                 return 0;
754         xmon_core(regs, 0);
755         return 1;
756 }
757 
758 static int xmon_ipi(struct pt_regs *regs)
759 {
760 #ifdef CONFIG_SMP
761         if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon))
762                 xmon_core(regs, 1);
763 #endif
764         return 0;
765 }
766 
767 static int xmon_fault_handler(struct pt_regs *regs)
768 {
769         struct bpt *bp;
770         unsigned long offset;
771 
772         if (in_xmon && catch_memory_errors)
773                 handle_fault(regs);     /* doesn't return */
774 
775         if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) {
776                 bp = in_breakpoint_table(regs->nip, &offset);
777                 if (bp != NULL) {
778                         regs->nip = bp->address + offset;
779                         atomic_dec(&bp->ref_count);
780                 }
781         }
782 
783         return 0;
784 }
785 
786 static struct bpt *at_breakpoint(unsigned long pc)
787 {
788         int i;
789         struct bpt *bp;
790 
791         bp = bpts;
792         for (i = 0; i < NBPTS; ++i, ++bp)
793                 if (bp->enabled && pc == bp->address)
794                         return bp;
795         return NULL;
796 }
797 
798 static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp)
799 {
800         unsigned long off;
801 
802         off = nip - (unsigned long) bpts;
803         if (off >= sizeof(bpts))
804                 return NULL;
805         off %= sizeof(struct bpt);
806         if (off != offsetof(struct bpt, instr[0])
807             && off != offsetof(struct bpt, instr[1]))
808                 return NULL;
809         *offp = off - offsetof(struct bpt, instr[0]);
810         return (struct bpt *) (nip - off);
811 }
812 
813 static struct bpt *new_breakpoint(unsigned long a)
814 {
815         struct bpt *bp;
816 
817         a &= ~3UL;
818         bp = at_breakpoint(a);
819         if (bp)
820                 return bp;
821 
822         for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
823                 if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
824                         bp->address = a;
825                         bp->instr[1] = bpinstr;
826                         store_inst(&bp->instr[1]);
827                         return bp;
828                 }
829         }
830 
831         printf("Sorry, no free breakpoints.  Please clear one first.\n");
832         return NULL;
833 }
834 
835 static void insert_bpts(void)
836 {
837         int i;
838         struct bpt *bp;
839 
840         bp = bpts;
841         for (i = 0; i < NBPTS; ++i, ++bp) {
842                 if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
843                         continue;
844                 if (mread(bp->address, &bp->instr[0], 4) != 4) {
845                         printf("Couldn't read instruction at %lx, "
846                                "disabling breakpoint there\n", bp->address);
847                         bp->enabled = 0;
848                         continue;
849                 }
850                 if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) {
851                         printf("Breakpoint at %lx is on an mtmsrd or rfid "
852                                "instruction, disabling it\n", bp->address);
853                         bp->enabled = 0;
854                         continue;
855                 }
856                 store_inst(&bp->instr[0]);
857                 if (bp->enabled & BP_CIABR)
858                         continue;
859                 if (patch_instruction((unsigned int *)bp->address,
860                                                         bpinstr) != 0) {
861                         printf("Couldn't write instruction at %lx, "
862                                "disabling breakpoint there\n", bp->address);
863                         bp->enabled &= ~BP_TRAP;
864                         continue;
865                 }
866                 store_inst((void *)bp->address);
867         }
868 }
869 
870 static void insert_cpu_bpts(void)
871 {
872         struct arch_hw_breakpoint brk;
873 
874         if (dabr.enabled) {
875                 brk.address = dabr.address;
876                 brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
877                 brk.len = 8;
878                 __set_breakpoint(&brk);
879         }
880 
881         if (iabr)
882                 set_ciabr(iabr->address);
883 }
884 
885 static void remove_bpts(void)
886 {
887         int i;
888         struct bpt *bp;
889         unsigned instr;
890 
891         bp = bpts;
892         for (i = 0; i < NBPTS; ++i, ++bp) {
893                 if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP)
894                         continue;
895                 if (mread(bp->address, &instr, 4) == 4
896                     && instr == bpinstr
897                     && patch_instruction(
898                         (unsigned int *)bp->address, bp->instr[0]) != 0)
899                         printf("Couldn't remove breakpoint at %lx\n",
900                                bp->address);
901                 else
902                         store_inst((void *)bp->address);
903         }
904 }
905 
906 static void remove_cpu_bpts(void)
907 {
908         hw_breakpoint_disable();
909         write_ciabr(0);
910 }
911 
912 /* Based on uptime_proc_show(). */
913 static void
914 show_uptime(void)
915 {
916         struct timespec uptime;
917 
918         if (setjmp(bus_error_jmp) == 0) {
919                 catch_memory_errors = 1;
920                 sync();
921 
922                 get_monotonic_boottime(&uptime);
923                 printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec,
924                         ((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100)));
925 
926                 sync();
927                 __delay(200);                                           \
928         }
929         catch_memory_errors = 0;
930 }
931 
932 static void set_lpp_cmd(void)
933 {
934         unsigned long lpp;
935 
936         if (!scanhex(&lpp)) {
937                 printf("Invalid number.\n");
938                 lpp = 0;
939         }
940         xmon_set_pagination_lpp(lpp);
941 }
942 /* Command interpreting routine */
943 static char *last_cmd;
944 
945 static int
946 cmds(struct pt_regs *excp)
947 {
948         int cmd = 0;
949 
950         last_cmd = NULL;
951         xmon_regs = excp;
952 
953         xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
954 
955         for(;;) {
956 #ifdef CONFIG_SMP
957                 printf("%x:", smp_processor_id());
958 #endif /* CONFIG_SMP */
959                 printf("mon> ");
960                 flush_input();
961                 termch = 0;
962                 cmd = skipbl();
963                 if( cmd == '\n' ) {
964                         if (last_cmd == NULL)
965                                 continue;
966                         take_input(last_cmd);
967                         last_cmd = NULL;
968                         cmd = inchar();
969                 }
970                 switch (cmd) {
971                 case 'm':
972                         cmd = inchar();
973                         switch (cmd) {
974                         case 'm':
975                         case 's':
976                         case 'd':
977                                 memops(cmd);
978                                 break;
979                         case 'l':
980                                 memlocate();
981                                 break;
982                         case 'z':
983                                 memzcan();
984                                 break;
985                         case 'i':
986                                 show_mem(0, NULL);
987                                 break;
988                         default:
989                                 termch = cmd;
990                                 memex();
991                         }
992                         break;
993                 case 'd':
994                         dump();
995                         break;
996                 case 'l':
997                         symbol_lookup();
998                         break;
999                 case 'r':
1000                         prregs(excp);   /* print regs */
1001                         break;
1002                 case 'e':
1003                         excprint(excp);
1004                         break;
1005                 case 'S':
1006                         super_regs();
1007                         break;
1008                 case 't':
1009                         backtrace(excp);
1010                         break;
1011                 case 'f':
1012                         cacheflush();
1013                         break;
1014                 case 's':
1015                         if (do_spu_cmd() == 0)
1016                                 break;
1017                         if (do_step(excp))
1018                                 return cmd;
1019                         break;
1020                 case 'x':
1021                 case 'X':
1022                         if (tracing_enabled)
1023                                 tracing_on();
1024                         return cmd;
1025                 case EOF:
1026                         printf(" <no input ...>\n");
1027                         mdelay(2000);
1028                         return cmd;
1029                 case '?':
1030                         xmon_puts(help_string);
1031                         break;
1032                 case '#':
1033                         set_lpp_cmd();
1034                         break;
1035                 case 'b':
1036                         bpt_cmds();
1037                         break;
1038                 case 'C':
1039                         csum();
1040                         break;
1041                 case 'c':
1042                         if (cpu_cmd())
1043                                 return 0;
1044                         break;
1045                 case 'z':
1046                         bootcmds();
1047                         break;
1048                 case 'p':
1049                         proccall();
1050                         break;
1051                 case 'P':
1052                         show_tasks();
1053                         break;
1054 #ifdef CONFIG_PPC_STD_MMU
1055                 case 'u':
1056                         dump_segments();
1057                         break;
1058 #elif defined(CONFIG_44x)
1059                 case 'u':
1060                         dump_tlb_44x();
1061                         break;
1062 #elif defined(CONFIG_PPC_BOOK3E)
1063                 case 'u':
1064                         dump_tlb_book3e();
1065                         break;
1066 #endif
1067                 case 'U':
1068                         show_uptime();
1069                         break;
1070                 default:
1071                         printf("Unrecognized command: ");
1072                         do {
1073                                 if (' ' < cmd && cmd <= '~')
1074                                         putchar(cmd);
1075                                 else
1076                                         printf("\\x%x", cmd);
1077                                 cmd = inchar();
1078                         } while (cmd != '\n');
1079                         printf(" (type ? for help)\n");
1080                         break;
1081                 }
1082         }
1083 }
1084 
1085 #ifdef CONFIG_BOOKE
1086 static int do_step(struct pt_regs *regs)
1087 {
1088         regs->msr |= MSR_DE;
1089         mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
1090         return 1;
1091 }
1092 #else
1093 /*
1094  * Step a single instruction.
1095  * Some instructions we emulate, others we execute with MSR_SE set.
1096  */
1097 static int do_step(struct pt_regs *regs)
1098 {
1099         unsigned int instr;
1100         int stepped;
1101 
1102         /* check we are in 64-bit kernel mode, translation enabled */
1103         if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) {
1104                 if (mread(regs->nip, &instr, 4) == 4) {
1105                         stepped = emulate_step(regs, instr);
1106                         if (stepped < 0) {
1107                                 printf("Couldn't single-step %s instruction\n",
1108                                        (IS_RFID(instr)? "rfid": "mtmsrd"));
1109                                 return 0;
1110                         }
1111                         if (stepped > 0) {
1112                                 regs->trap = 0xd00 | (regs->trap & 1);
1113                                 printf("stepped to ");
1114                                 xmon_print_symbol(regs->nip, " ", "\n");
1115                                 ppc_inst_dump(regs->nip, 1, 0);
1116                                 return 0;
1117                         }
1118                 }
1119         }
1120         regs->msr |= MSR_SE;
1121         return 1;
1122 }
1123 #endif
1124 
1125 static void bootcmds(void)
1126 {
1127         int cmd;
1128 
1129         cmd = inchar();
1130         if (cmd == 'r')
1131                 ppc_md.restart(NULL);
1132         else if (cmd == 'h')
1133                 ppc_md.halt();
1134         else if (cmd == 'p')
1135                 if (pm_power_off)
1136                         pm_power_off();
1137 }
1138 
1139 static int cpu_cmd(void)
1140 {
1141 #ifdef CONFIG_SMP
1142         unsigned long cpu, first_cpu, last_cpu;
1143         int timeout;
1144 
1145         if (!scanhex(&cpu)) {
1146                 /* print cpus waiting or in xmon */
1147                 printf("cpus stopped:");
1148                 last_cpu = first_cpu = NR_CPUS;
1149                 for_each_possible_cpu(cpu) {
1150                         if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
1151                                 if (cpu == last_cpu + 1) {
1152                                         last_cpu = cpu;
1153                                 } else {
1154                                         if (last_cpu != first_cpu)
1155                                                 printf("-0x%lx", last_cpu);
1156                                         last_cpu = first_cpu = cpu;
1157                                         printf(" 0x%lx", cpu);
1158                                 }
1159                         }
1160                 }
1161                 if (last_cpu != first_cpu)
1162                         printf("-0x%lx", last_cpu);
1163                 printf("\n");
1164                 return 0;
1165         }
1166         /* try to switch to cpu specified */
1167         if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) {
1168                 printf("cpu 0x%x isn't in xmon\n", cpu);
1169                 return 0;
1170         }
1171         xmon_taken = 0;
1172         mb();
1173         xmon_owner = cpu;
1174         timeout = 10000000;
1175         while (!xmon_taken) {
1176                 if (--timeout == 0) {
1177                         if (test_and_set_bit(0, &xmon_taken))
1178                                 break;
1179                         /* take control back */
1180                         mb();
1181                         xmon_owner = smp_processor_id();
1182                         printf("cpu 0x%x didn't take control\n", cpu);
1183                         return 0;
1184                 }
1185                 barrier();
1186         }
1187         return 1;
1188 #else
1189         return 0;
1190 #endif /* CONFIG_SMP */
1191 }
1192 
1193 static unsigned short fcstab[256] = {
1194         0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
1195         0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
1196         0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
1197         0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
1198         0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
1199         0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
1200         0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
1201         0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
1202         0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
1203         0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
1204         0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
1205         0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
1206         0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
1207         0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
1208         0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
1209         0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
1210         0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
1211         0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
1212         0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
1213         0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
1214         0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
1215         0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
1216         0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
1217         0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
1218         0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
1219         0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
1220         0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
1221         0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
1222         0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
1223         0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
1224         0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
1225         0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
1226 };
1227 
1228 #define FCS(fcs, c)     (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
1229 
1230 static void
1231 csum(void)
1232 {
1233         unsigned int i;
1234         unsigned short fcs;
1235         unsigned char v;
1236 
1237         if (!scanhex(&adrs))
1238                 return;
1239         if (!scanhex(&ncsum))
1240                 return;
1241         fcs = 0xffff;
1242         for (i = 0; i < ncsum; ++i) {
1243                 if (mread(adrs+i, &v, 1) == 0) {
1244                         printf("csum stopped at "REG"\n", adrs+i);
1245                         break;
1246                 }
1247                 fcs = FCS(fcs, v);
1248         }
1249         printf("%x\n", fcs);
1250 }
1251 
1252 /*
1253  * Check if this is a suitable place to put a breakpoint.
1254  */
1255 static long check_bp_loc(unsigned long addr)
1256 {
1257         unsigned int instr;
1258 
1259         addr &= ~3;
1260         if (!is_kernel_addr(addr)) {
1261                 printf("Breakpoints may only be placed at kernel addresses\n");
1262                 return 0;
1263         }
1264         if (!mread(addr, &instr, sizeof(instr))) {
1265                 printf("Can't read instruction at address %lx\n", addr);
1266                 return 0;
1267         }
1268         if (IS_MTMSRD(instr) || IS_RFID(instr)) {
1269                 printf("Breakpoints may not be placed on mtmsrd or rfid "
1270                        "instructions\n");
1271                 return 0;
1272         }
1273         return 1;
1274 }
1275 
1276 static char *breakpoint_help_string =
1277     "Breakpoint command usage:\n"
1278     "b                show breakpoints\n"
1279     "b <addr> [cnt]   set breakpoint at given instr addr\n"
1280     "bc               clear all breakpoints\n"
1281     "bc <n/addr>      clear breakpoint number n or at addr\n"
1282     "bi <addr> [cnt]  set hardware instr breakpoint (POWER8 only)\n"
1283     "bd <addr> [cnt]  set hardware data breakpoint\n"
1284     "";
1285 
1286 static void
1287 bpt_cmds(void)
1288 {
1289         int cmd;
1290         unsigned long a;
1291         int i;
1292         struct bpt *bp;
1293 
1294         cmd = inchar();
1295         switch (cmd) {
1296 #ifndef CONFIG_PPC_8xx
1297         static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n";
1298         int mode;
1299         case 'd':       /* bd - hardware data breakpoint */
1300                 mode = 7;
1301                 cmd = inchar();
1302                 if (cmd == 'r')
1303                         mode = 5;
1304                 else if (cmd == 'w')
1305                         mode = 6;
1306                 else
1307                         termch = cmd;
1308                 dabr.address = 0;
1309                 dabr.enabled = 0;
1310                 if (scanhex(&dabr.address)) {
1311                         if (!is_kernel_addr(dabr.address)) {
1312                                 printf(badaddr);
1313                                 break;
1314                         }
1315                         dabr.address &= ~HW_BRK_TYPE_DABR;
1316                         dabr.enabled = mode | BP_DABR;
1317                 }
1318                 break;
1319 
1320         case 'i':       /* bi - hardware instr breakpoint */
1321                 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
1322                         printf("Hardware instruction breakpoint "
1323                                "not supported on this cpu\n");
1324                         break;
1325                 }
1326                 if (iabr) {
1327                         iabr->enabled &= ~BP_CIABR;
1328                         iabr = NULL;
1329                 }
1330                 if (!scanhex(&a))
1331                         break;
1332                 if (!check_bp_loc(a))
1333                         break;
1334                 bp = new_breakpoint(a);
1335                 if (bp != NULL) {
1336                         bp->enabled |= BP_CIABR;
1337                         iabr = bp;
1338                 }
1339                 break;
1340 #endif
1341 
1342         case 'c':
1343                 if (!scanhex(&a)) {
1344                         /* clear all breakpoints */
1345                         for (i = 0; i < NBPTS; ++i)
1346                                 bpts[i].enabled = 0;
1347                         iabr = NULL;
1348                         dabr.enabled = 0;
1349                         printf("All breakpoints cleared\n");
1350                         break;
1351                 }
1352 
1353                 if (a <= NBPTS && a >= 1) {
1354                         /* assume a breakpoint number */
1355                         bp = &bpts[a-1];        /* bp nums are 1 based */
1356                 } else {
1357                         /* assume a breakpoint address */
1358                         bp = at_breakpoint(a);
1359                         if (bp == NULL) {
1360                                 printf("No breakpoint at %lx\n", a);
1361                                 break;
1362                         }
1363                 }
1364 
1365                 printf("Cleared breakpoint %lx (", BP_NUM(bp));
1366                 xmon_print_symbol(bp->address, " ", ")\n");
1367                 bp->enabled = 0;
1368                 break;
1369 
1370         default:
1371                 termch = cmd;
1372                 cmd = skipbl();
1373                 if (cmd == '?') {
1374                         printf(breakpoint_help_string);
1375                         break;
1376                 }
1377                 termch = cmd;
1378                 if (!scanhex(&a)) {
1379                         /* print all breakpoints */
1380                         printf("   type            address\n");
1381                         if (dabr.enabled) {
1382                                 printf("   data   "REG"  [", dabr.address);
1383                                 if (dabr.enabled & 1)
1384                                         printf("r");
1385                                 if (dabr.enabled & 2)
1386                                         printf("w");
1387                                 printf("]\n");
1388                         }
1389                         for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
1390                                 if (!bp->enabled)
1391                                         continue;
1392                                 printf("%2x %s   ", BP_NUM(bp),
1393                                     (bp->enabled & BP_CIABR) ? "inst": "trap");
1394                                 xmon_print_symbol(bp->address, "  ", "\n");
1395                         }
1396                         break;
1397                 }
1398 
1399                 if (!check_bp_loc(a))
1400                         break;
1401                 bp = new_breakpoint(a);
1402                 if (bp != NULL)
1403                         bp->enabled |= BP_TRAP;
1404                 break;
1405         }
1406 }
1407 
1408 /* Very cheap human name for vector lookup. */
1409 static
1410 const char *getvecname(unsigned long vec)
1411 {
1412         char *ret;
1413 
1414         switch (vec) {
1415         case 0x100:     ret = "(System Reset)"; break;
1416         case 0x200:     ret = "(Machine Check)"; break;
1417         case 0x300:     ret = "(Data Access)"; break;
1418         case 0x380:
1419                 if (radix_enabled())
1420                         ret = "(Data Access Out of Range)";
1421                 else
1422                         ret = "(Data SLB Access)";
1423                 break;
1424         case 0x400:     ret = "(Instruction Access)"; break;
1425         case 0x480:
1426                 if (radix_enabled())
1427                         ret = "(Instruction Access Out of Range)";
1428                 else
1429                         ret = "(Instruction SLB Access)";
1430                 break;
1431         case 0x500:     ret = "(Hardware Interrupt)"; break;
1432         case 0x600:     ret = "(Alignment)"; break;
1433         case 0x700:     ret = "(Program Check)"; break;
1434         case 0x800:     ret = "(FPU Unavailable)"; break;
1435         case 0x900:     ret = "(Decrementer)"; break;
1436         case 0x980:     ret = "(Hypervisor Decrementer)"; break;
1437         case 0xa00:     ret = "(Doorbell)"; break;
1438         case 0xc00:     ret = "(System Call)"; break;
1439         case 0xd00:     ret = "(Single Step)"; break;
1440         case 0xe40:     ret = "(Emulation Assist)"; break;
1441         case 0xe60:     ret = "(HMI)"; break;
1442         case 0xe80:     ret = "(Hypervisor Doorbell)"; break;
1443         case 0xf00:     ret = "(Performance Monitor)"; break;
1444         case 0xf20:     ret = "(Altivec Unavailable)"; break;
1445         case 0x1300:    ret = "(Instruction Breakpoint)"; break;
1446         case 0x1500:    ret = "(Denormalisation)"; break;
1447         case 0x1700:    ret = "(Altivec Assist)"; break;
1448         default: ret = "";
1449         }
1450         return ret;
1451 }
1452 
1453 static void get_function_bounds(unsigned long pc, unsigned long *startp,
1454                                 unsigned long *endp)
1455 {
1456         unsigned long size, offset;
1457         const char *name;
1458 
1459         *startp = *endp = 0;
1460         if (pc == 0)
1461                 return;
1462         if (setjmp(bus_error_jmp) == 0) {
1463                 catch_memory_errors = 1;
1464                 sync();
1465                 name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr);
1466                 if (name != NULL) {
1467                         *startp = pc - offset;
1468                         *endp = pc - offset + size;
1469                 }
1470                 sync();
1471         }
1472         catch_memory_errors = 0;
1473 }
1474 
1475 #define LRSAVE_OFFSET           (STACK_FRAME_LR_SAVE * sizeof(unsigned long))
1476 #define MARKER_OFFSET           (STACK_FRAME_MARKER * sizeof(unsigned long))
1477 
1478 static void xmon_show_stack(unsigned long sp, unsigned long lr,
1479                             unsigned long pc)
1480 {
1481         int max_to_print = 64;
1482         unsigned long ip;
1483         unsigned long newsp;
1484         unsigned long marker;
1485         struct pt_regs regs;
1486 
1487         while (max_to_print--) {
1488                 if (!is_kernel_addr(sp)) {
1489                         if (sp != 0)
1490                                 printf("SP (%lx) is in userspace\n", sp);
1491                         break;
1492                 }
1493 
1494                 if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long))
1495                     || !mread(sp, &newsp, sizeof(unsigned long))) {
1496                         printf("Couldn't read stack frame at %lx\n", sp);
1497                         break;
1498                 }
1499 
1500                 /*
1501                  * For the first stack frame, try to work out if
1502                  * LR and/or the saved LR value in the bottommost
1503                  * stack frame are valid.
1504                  */
1505                 if ((pc | lr) != 0) {
1506                         unsigned long fnstart, fnend;
1507                         unsigned long nextip;
1508                         int printip = 1;
1509 
1510                         get_function_bounds(pc, &fnstart, &fnend);
1511                         nextip = 0;
1512                         if (newsp > sp)
1513                                 mread(newsp + LRSAVE_OFFSET, &nextip,
1514                                       sizeof(unsigned long));
1515                         if (lr == ip) {
1516                                 if (!is_kernel_addr(lr)
1517                                     || (fnstart <= lr && lr < fnend))
1518                                         printip = 0;
1519                         } else if (lr == nextip) {
1520                                 printip = 0;
1521                         } else if (is_kernel_addr(lr)
1522                                    && !(fnstart <= lr && lr < fnend)) {
1523                                 printf("[link register   ] ");
1524                                 xmon_print_symbol(lr, " ", "\n");
1525                         }
1526                         if (printip) {
1527                                 printf("["REG"] ", sp);
1528                                 xmon_print_symbol(ip, " ", " (unreliable)\n");
1529                         }
1530                         pc = lr = 0;
1531 
1532                 } else {
1533                         printf("["REG"] ", sp);
1534                         xmon_print_symbol(ip, " ", "\n");
1535                 }
1536 
1537                 /* Look for "regshere" marker to see if this is
1538                    an exception frame. */
1539                 if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long))
1540                     && marker == STACK_FRAME_REGS_MARKER) {
1541                         if (mread(sp + STACK_FRAME_OVERHEAD, &regs, sizeof(regs))
1542                             != sizeof(regs)) {
1543                                 printf("Couldn't read registers at %lx\n",
1544                                        sp + STACK_FRAME_OVERHEAD);
1545                                 break;
1546                         }
1547                         printf("--- Exception: %lx %s at ", regs.trap,
1548                                getvecname(TRAP(&regs)));
1549                         pc = regs.nip;
1550                         lr = regs.link;
1551                         xmon_print_symbol(pc, " ", "\n");
1552                 }
1553 
1554                 if (newsp == 0)
1555                         break;
1556 
1557                 sp = newsp;
1558         }
1559 }
1560 
1561 static void backtrace(struct pt_regs *excp)
1562 {
1563         unsigned long sp;
1564 
1565         if (scanhex(&sp))
1566                 xmon_show_stack(sp, 0, 0);
1567         else
1568                 xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
1569         scannl();
1570 }
1571 
1572 static void print_bug_trap(struct pt_regs *regs)
1573 {
1574 #ifdef CONFIG_BUG
1575         const struct bug_entry *bug;
1576         unsigned long addr;
1577 
1578         if (regs->msr & MSR_PR)
1579                 return;         /* not in kernel */
1580         addr = regs->nip;       /* address of trap instruction */
1581         if (!is_kernel_addr(addr))
1582                 return;
1583         bug = find_bug(regs->nip);
1584         if (bug == NULL)
1585                 return;
1586         if (is_warning_bug(bug))
1587                 return;
1588 
1589 #ifdef CONFIG_DEBUG_BUGVERBOSE
1590         printf("kernel BUG at %s:%u!\n",
1591                bug->file, bug->line);
1592 #else
1593         printf("kernel BUG at %px!\n", (void *)bug->bug_addr);
1594 #endif
1595 #endif /* CONFIG_BUG */
1596 }
1597 
1598 static void excprint(struct pt_regs *fp)
1599 {
1600         unsigned long trap;
1601 
1602 #ifdef CONFIG_SMP
1603         printf("cpu 0x%x: ", smp_processor_id());
1604 #endif /* CONFIG_SMP */
1605 
1606         trap = TRAP(fp);
1607         printf("Vector: %lx %s at [%lx]\n", fp->trap, getvecname(trap), fp);
1608         printf("    pc: ");
1609         xmon_print_symbol(fp->nip, ": ", "\n");
1610 
1611         printf("    lr: ", fp->link);
1612         xmon_print_symbol(fp->link, ": ", "\n");
1613 
1614         printf("    sp: %lx\n", fp->gpr[1]);
1615         printf("   msr: %lx\n", fp->msr);
1616 
1617         if (trap == 0x300 || trap == 0x380 || trap == 0x600 || trap == 0x200) {
1618                 printf("   dar: %lx\n", fp->dar);
1619                 if (trap != 0x380)
1620                         printf(" dsisr: %lx\n", fp->dsisr);
1621         }
1622 
1623         printf("  current = 0x%lx\n", current);
1624 #ifdef CONFIG_PPC64
1625         printf("  paca    = 0x%lx\t softe: %d\t irq_happened: 0x%02x\n",
1626                local_paca, local_paca->soft_enabled, local_paca->irq_happened);
1627 #endif
1628         if (current) {
1629                 printf("    pid   = %ld, comm = %s\n",
1630                        current->pid, current->comm);
1631         }
1632 
1633         if (trap == 0x700)
1634                 print_bug_trap(fp);
1635 
1636         printf(linux_banner);
1637 }
1638 
1639 static void prregs(struct pt_regs *fp)
1640 {
1641         int n, trap;
1642         unsigned long base;
1643         struct pt_regs regs;
1644 
1645         if (scanhex(&base)) {
1646                 if (setjmp(bus_error_jmp) == 0) {
1647                         catch_memory_errors = 1;
1648                         sync();
1649                         regs = *(struct pt_regs *)base;
1650                         sync();
1651                         __delay(200);
1652                 } else {
1653                         catch_memory_errors = 0;
1654                         printf("*** Error reading registers from "REG"\n",
1655                                base);
1656                         return;
1657                 }
1658                 catch_memory_errors = 0;
1659                 fp = &regs;
1660         }
1661 
1662 #ifdef CONFIG_PPC64
1663         if (FULL_REGS(fp)) {
1664                 for (n = 0; n < 16; ++n)
1665                         printf("R%.2ld = "REG"   R%.2ld = "REG"\n",
1666                                n, fp->gpr[n], n+16, fp->gpr[n+16]);
1667         } else {
1668                 for (n = 0; n < 7; ++n)
1669                         printf("R%.2ld = "REG"   R%.2ld = "REG"\n",
1670                                n, fp->gpr[n], n+7, fp->gpr[n+7]);
1671         }
1672 #else
1673         for (n = 0; n < 32; ++n) {
1674                 printf("R%.2d = %.8x%s", n, fp->gpr[n],
1675                        (n & 3) == 3? "\n": "   ");
1676                 if (n == 12 && !FULL_REGS(fp)) {
1677                         printf("\n");
1678                         break;
1679                 }
1680         }
1681 #endif
1682         printf("pc  = ");
1683         xmon_print_symbol(fp->nip, " ", "\n");
1684         if (TRAP(fp) != 0xc00 && cpu_has_feature(CPU_FTR_CFAR)) {
1685                 printf("cfar= ");
1686                 xmon_print_symbol(fp->orig_gpr3, " ", "\n");
1687         }
1688         printf("lr  = ");
1689         xmon_print_symbol(fp->link, " ", "\n");
1690         printf("msr = "REG"   cr  = %.8lx\n", fp->msr, fp->ccr);
1691         printf("ctr = "REG"   xer = "REG"   trap = %4lx\n",
1692                fp->ctr, fp->xer, fp->trap);
1693         trap = TRAP(fp);
1694         if (trap == 0x300 || trap == 0x380 || trap == 0x600)
1695                 printf("dar = "REG"   dsisr = %.8lx\n", fp->dar, fp->dsisr);
1696 }
1697 
1698 static void cacheflush(void)
1699 {
1700         int cmd;
1701         unsigned long nflush;
1702 
1703         cmd = inchar();
1704         if (cmd != 'i')
1705                 termch = cmd;
1706         scanhex((void *)&adrs);
1707         if (termch != '\n')
1708                 termch = 0;
1709         nflush = 1;
1710         scanhex(&nflush);
1711         nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES;
1712         if (setjmp(bus_error_jmp) == 0) {
1713                 catch_memory_errors = 1;
1714                 sync();
1715 
1716                 if (cmd != 'i') {
1717                         for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
1718                                 cflush((void *) adrs);
1719                 } else {
1720                         for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
1721                                 cinval((void *) adrs);
1722                 }
1723                 sync();
1724                 /* wait a little while to see if we get a machine check */
1725                 __delay(200);
1726         }
1727         catch_memory_errors = 0;
1728 }
1729 
1730 extern unsigned long xmon_mfspr(int spr, unsigned long default_value);
1731 extern void xmon_mtspr(int spr, unsigned long value);
1732 
1733 static int
1734 read_spr(int n, unsigned long *vp)
1735 {
1736         unsigned long ret = -1UL;
1737         int ok = 0;
1738 
1739         if (setjmp(bus_error_jmp) == 0) {
1740                 catch_spr_faults = 1;
1741                 sync();
1742 
1743                 ret = xmon_mfspr(n, *vp);
1744 
1745                 sync();
1746                 *vp = ret;
1747                 ok = 1;
1748         }
1749         catch_spr_faults = 0;
1750 
1751         return ok;
1752 }
1753 
1754 static void
1755 write_spr(int n, unsigned long val)
1756 {
1757         if (setjmp(bus_error_jmp) == 0) {
1758                 catch_spr_faults = 1;
1759                 sync();
1760 
1761                 xmon_mtspr(n, val);
1762 
1763                 sync();
1764         } else {
1765                 printf("SPR 0x%03x (%4d) Faulted during write\n", n, n);
1766         }
1767         catch_spr_faults = 0;
1768 }
1769 
1770 static void dump_206_sprs(void)
1771 {
1772 #ifdef CONFIG_PPC64
1773         if (!cpu_has_feature(CPU_FTR_ARCH_206))
1774                 return;
1775 
1776         /* Actually some of these pre-date 2.06, but whatevs */
1777 
1778         printf("srr0   = %.16lx  srr1  = %.16lx dsisr  = %.8x\n",
1779                 mfspr(SPRN_SRR0), mfspr(SPRN_SRR1), mfspr(SPRN_DSISR));
1780         printf("dscr   = %.16lx  ppr   = %.16lx pir    = %.8x\n",
1781                 mfspr(SPRN_DSCR), mfspr(SPRN_PPR), mfspr(SPRN_PIR));
1782         printf("amr    = %.16lx  uamor = %.16lx\n",
1783                 mfspr(SPRN_AMR), mfspr(SPRN_UAMOR));
1784 
1785         if (!(mfmsr() & MSR_HV))
1786                 return;
1787 
1788         printf("sdr1   = %.16lx  hdar  = %.16lx hdsisr = %.8x\n",
1789                 mfspr(SPRN_SDR1), mfspr(SPRN_HDAR), mfspr(SPRN_HDSISR));
1790         printf("hsrr0  = %.16lx hsrr1  = %.16lx hdec   = %.16lx\n",
1791                 mfspr(SPRN_HSRR0), mfspr(SPRN_HSRR1), mfspr(SPRN_HDEC));
1792         printf("lpcr   = %.16lx  pcr   = %.16lx lpidr  = %.8x\n",
1793                 mfspr(SPRN_LPCR), mfspr(SPRN_PCR), mfspr(SPRN_LPID));
1794         printf("hsprg0 = %.16lx hsprg1 = %.16lx amor   = %.16lx\n",
1795                 mfspr(SPRN_HSPRG0), mfspr(SPRN_HSPRG1), mfspr(SPRN_AMOR));
1796         printf("dabr   = %.16lx dabrx  = %.16lx\n",
1797                 mfspr(SPRN_DABR), mfspr(SPRN_DABRX));
1798 #endif
1799 }
1800 
1801 static void dump_207_sprs(void)
1802 {
1803 #ifdef CONFIG_PPC64
1804         unsigned long msr;
1805 
1806         if (!cpu_has_feature(CPU_FTR_ARCH_207S))
1807                 return;
1808 
1809         printf("dpdes  = %.16lx  tir   = %.16lx cir    = %.8x\n",
1810                 mfspr(SPRN_DPDES), mfspr(SPRN_TIR), mfspr(SPRN_CIR));
1811 
1812         printf("fscr   = %.16lx  tar   = %.16lx pspb   = %.8x\n",
1813                 mfspr(SPRN_FSCR), mfspr(SPRN_TAR), mfspr(SPRN_PSPB));
1814 
1815         msr = mfmsr();
1816         if (msr & MSR_TM) {
1817                 /* Only if TM has been enabled in the kernel */
1818                 printf("tfhar  = %.16lx  tfiar = %.16lx texasr = %.16lx\n",
1819                         mfspr(SPRN_TFHAR), mfspr(SPRN_TFIAR),
1820                         mfspr(SPRN_TEXASR));
1821         }
1822 
1823         printf("mmcr0  = %.16lx  mmcr1 = %.16lx mmcr2  = %.16lx\n",
1824                 mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCR2));
1825         printf("pmc1   = %.8x pmc2 = %.8x  pmc3 = %.8x  pmc4   = %.8x\n",
1826                 mfspr(SPRN_PMC1), mfspr(SPRN_PMC2),
1827                 mfspr(SPRN_PMC3), mfspr(SPRN_PMC4));
1828         printf("mmcra  = %.16lx   siar = %.16lx pmc5   = %.8x\n",
1829                 mfspr(SPRN_MMCRA), mfspr(SPRN_SIAR), mfspr(SPRN_PMC5));
1830         printf("sdar   = %.16lx   sier = %.16lx pmc6   = %.8x\n",
1831                 mfspr(SPRN_SDAR), mfspr(SPRN_SIER), mfspr(SPRN_PMC6));
1832         printf("ebbhr  = %.16lx  ebbrr = %.16lx bescr  = %.16lx\n",
1833                 mfspr(SPRN_EBBHR), mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR));
1834         printf("iamr   = %.16lx\n", mfspr(SPRN_IAMR));
1835 
1836         if (!(msr & MSR_HV))
1837                 return;
1838 
1839         printf("hfscr  = %.16lx  dhdes = %.16lx rpr    = %.16lx\n",
1840                 mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR));
1841         printf("dawr   = %.16lx  dawrx = %.16lx ciabr  = %.16lx\n",
1842                 mfspr(SPRN_DAWR), mfspr(SPRN_DAWRX), mfspr(SPRN_CIABR));
1843 #endif
1844 }
1845 
1846 static void dump_300_sprs(void)
1847 {
1848 #ifdef CONFIG_PPC64
1849         bool hv = mfmsr() & MSR_HV;
1850 
1851         if (!cpu_has_feature(CPU_FTR_ARCH_300))
1852                 return;
1853 
1854         printf("pidr   = %.16lx  tidr  = %.16lx\n",
1855                 mfspr(SPRN_PID), mfspr(SPRN_TIDR));
1856         printf("asdr   = %.16lx  psscr = %.16lx\n",
1857                 mfspr(SPRN_ASDR), hv ? mfspr(SPRN_PSSCR)
1858                                         : mfspr(SPRN_PSSCR_PR));
1859 
1860         if (!hv)
1861                 return;
1862 
1863         printf("ptcr   = %.16lx\n",
1864                 mfspr(SPRN_PTCR));
1865 #endif
1866 }
1867 
1868 static void dump_one_spr(int spr, bool show_unimplemented)
1869 {
1870         unsigned long val;
1871 
1872         val = 0xdeadbeef;
1873         if (!read_spr(spr, &val)) {
1874                 printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
1875                 return;
1876         }
1877 
1878         if (val == 0xdeadbeef) {
1879                 /* Looks like read was a nop, confirm */
1880                 val = 0x0badcafe;
1881                 if (!read_spr(spr, &val)) {
1882                         printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
1883                         return;
1884                 }
1885 
1886                 if (val == 0x0badcafe) {
1887                         if (show_unimplemented)
1888                                 printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr);
1889                         return;
1890                 }
1891         }
1892 
1893         printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val);
1894 }
1895 
1896 static void super_regs(void)
1897 {
1898         static unsigned long regno;
1899         int cmd;
1900         int spr;
1901 
1902         cmd = skipbl();
1903 
1904         switch (cmd) {
1905         case '\n': {
1906                 unsigned long sp, toc;
1907                 asm("mr %0,1" : "=r" (sp) :);
1908                 asm("mr %0,2" : "=r" (toc) :);
1909 
1910                 printf("msr    = "REG"  sprg0 = "REG"\n",
1911                        mfmsr(), mfspr(SPRN_SPRG0));
1912                 printf("pvr    = "REG"  sprg1 = "REG"\n",
1913                        mfspr(SPRN_PVR), mfspr(SPRN_SPRG1));
1914                 printf("dec    = "REG"  sprg2 = "REG"\n",
1915                        mfspr(SPRN_DEC), mfspr(SPRN_SPRG2));
1916                 printf("sp     = "REG"  sprg3 = "REG"\n", sp, mfspr(SPRN_SPRG3));
1917                 printf("toc    = "REG"  dar   = "REG"\n", toc, mfspr(SPRN_DAR));
1918 
1919                 dump_206_sprs();
1920                 dump_207_sprs();
1921                 dump_300_sprs();
1922 
1923                 return;
1924         }
1925         case 'w': {
1926                 unsigned long val;
1927                 scanhex(&regno);
1928                 val = 0;
1929                 read_spr(regno, &val);
1930                 scanhex(&val);
1931                 write_spr(regno, val);
1932                 dump_one_spr(regno, true);
1933                 break;
1934         }
1935         case 'r':
1936                 scanhex(&regno);
1937                 dump_one_spr(regno, true);
1938                 break;
1939         case 'a':
1940                 /* dump ALL SPRs */
1941                 for (spr = 1; spr < 1024; ++spr)
1942                         dump_one_spr(spr, false);
1943                 break;
1944         }
1945 
1946         scannl();
1947 }
1948 
1949 /*
1950  * Stuff for reading and writing memory safely
1951  */
1952 static int
1953 mread(unsigned long adrs, void *buf, int size)
1954 {
1955         volatile int n;
1956         char *p, *q;
1957 
1958         n = 0;
1959         if (setjmp(bus_error_jmp) == 0) {
1960                 catch_memory_errors = 1;
1961                 sync();
1962                 p = (char *)adrs;
1963                 q = (char *)buf;
1964                 switch (size) {
1965                 case 2:
1966                         *(u16 *)q = *(u16 *)p;
1967                         break;
1968                 case 4:
1969                         *(u32 *)q = *(u32 *)p;
1970                         break;
1971                 case 8:
1972                         *(u64 *)q = *(u64 *)p;
1973                         break;
1974                 default:
1975                         for( ; n < size; ++n) {
1976                                 *q++ = *p++;
1977                                 sync();
1978                         }
1979                 }
1980                 sync();
1981                 /* wait a little while to see if we get a machine check */
1982                 __delay(200);
1983                 n = size;
1984         }
1985         catch_memory_errors = 0;
1986         return n;
1987 }
1988 
1989 static int
1990 mwrite(unsigned long adrs, void *buf, int size)
1991 {
1992         volatile int n;
1993         char *p, *q;
1994 
1995         n = 0;
1996         if (setjmp(bus_error_jmp) == 0) {
1997                 catch_memory_errors = 1;
1998                 sync();
1999                 p = (char *) adrs;
2000                 q = (char *) buf;
2001                 switch (size) {
2002                 case 2:
2003                         *(u16 *)p = *(u16 *)q;
2004                         break;
2005                 case 4:
2006                         *(u32 *)p = *(u32 *)q;
2007                         break;
2008                 case 8:
2009                         *(u64 *)p = *(u64 *)q;
2010                         break;
2011                 default:
2012                         for ( ; n < size; ++n) {
2013                                 *p++ = *q++;
2014                                 sync();
2015                         }
2016                 }
2017                 sync();
2018                 /* wait a little while to see if we get a machine check */
2019                 __delay(200);
2020                 n = size;
2021         } else {
2022                 printf("*** Error writing address "REG"\n", adrs + n);
2023         }
2024         catch_memory_errors = 0;
2025         return n;
2026 }
2027 
2028 static int fault_type;
2029 static int fault_except;
2030 static char *fault_chars[] = { "--", "**", "##" };
2031 
2032 static int handle_fault(struct pt_regs *regs)
2033 {
2034         fault_except = TRAP(regs);
2035         switch (TRAP(regs)) {
2036         case 0x200:
2037                 fault_type = 0;
2038                 break;
2039         case 0x300:
2040         case 0x380:
2041                 fault_type = 1;
2042                 break;
2043         default:
2044                 fault_type = 2;
2045         }
2046 
2047         longjmp(bus_error_jmp, 1);
2048 
2049         return 0;
2050 }
2051 
2052 #define SWAP(a, b, t)   ((t) = (a), (a) = (b), (b) = (t))
2053 
2054 static void
2055 byterev(unsigned char *val, int size)
2056 {
2057         int t;
2058         
2059         switch (size) {
2060         case 2:
2061                 SWAP(val[0], val[1], t);
2062                 break;
2063         case 4:
2064                 SWAP(val[0], val[3], t);
2065                 SWAP(val[1], val[2], t);
2066                 break;
2067         case 8: /* is there really any use for this? */
2068                 SWAP(val[0], val[7], t);
2069                 SWAP(val[1], val[6], t);
2070                 SWAP(val[2], val[5], t);
2071                 SWAP(val[3], val[4], t);
2072                 break;
2073         }
2074 }
2075 
2076 static int brev;
2077 static int mnoread;
2078 
2079 static char *memex_help_string =
2080     "Memory examine command usage:\n"
2081     "m [addr] [flags] examine/change memory\n"
2082     "  addr is optional.  will start where left off.\n"
2083     "  flags may include chars from this set:\n"
2084     "    b   modify by bytes (default)\n"
2085     "    w   modify by words (2 byte)\n"
2086     "    l   modify by longs (4 byte)\n"
2087     "    d   modify by doubleword (8 byte)\n"
2088     "    r   toggle reverse byte order mode\n"
2089     "    n   do not read memory (for i/o spaces)\n"
2090     "    .   ok to read (default)\n"
2091     "NOTE: flags are saved as defaults\n"
2092     "";
2093 
2094 static char *memex_subcmd_help_string =
2095     "Memory examine subcommands:\n"
2096     "  hexval   write this val to current location\n"
2097     "  'string' write chars from string to this location\n"
2098     "  '        increment address\n"
2099     "  ^        decrement address\n"
2100     "  /        increment addr by 0x10.  //=0x100, ///=0x1000, etc\n"
2101     "  \\        decrement addr by 0x10.  \\\\=0x100, \\\\\\=0x1000, etc\n"
2102     "  `        clear no-read flag\n"
2103     "  ;        stay at this addr\n"
2104     "  v        change to byte mode\n"
2105     "  w        change to word (2 byte) mode\n"
2106     "  l        change to long (4 byte) mode\n"
2107     "  u        change to doubleword (8 byte) mode\n"
2108     "  m addr   change current addr\n"
2109     "  n        toggle no-read flag\n"
2110     "  r        toggle byte reverse flag\n"
2111     "  < count  back up count bytes\n"
2112     "  > count  skip forward count bytes\n"
2113     "  x        exit this mode\n"
2114     "";
2115 
2116 static void
2117 memex(void)
2118 {
2119         int cmd, inc, i, nslash;
2120         unsigned long n;
2121         unsigned char val[16];
2122 
2123         scanhex((void *)&adrs);
2124         cmd = skipbl();
2125         if (cmd == '?') {
2126                 printf(memex_help_string);
2127                 return;
2128         } else {
2129                 termch = cmd;
2130         }
2131         last_cmd = "m\n";
2132         while ((cmd = skipbl()) != '\n') {
2133                 switch( cmd ){
2134                 case 'b':       size = 1;       break;
2135                 case 'w':       size = 2;       break;
2136                 case 'l':       size = 4;       break;
2137                 case 'd':       size = 8;       break;
2138                 case 'r':       brev = !brev;   break;
2139                 case 'n':       mnoread = 1;    break;
2140                 case '.':       mnoread = 0;    break;
2141                 }
2142         }
2143         if( size <= 0 )
2144                 size = 1;
2145         else if( size > 8 )
2146                 size = 8;
2147         for(;;){
2148                 if (!mnoread)
2149                         n = mread(adrs, val, size);
2150                 printf(REG"%c", adrs, brev? 'r': ' ');
2151                 if (!mnoread) {
2152                         if (brev)
2153                                 byterev(val, size);
2154                         putchar(' ');
2155                         for (i = 0; i < n; ++i)
2156                                 printf("%.2x", val[i]);
2157                         for (; i < size; ++i)
2158                                 printf("%s", fault_chars[fault_type]);
2159                 }
2160                 putchar(' ');
2161                 inc = size;
2162                 nslash = 0;
2163                 for(;;){
2164                         if( scanhex(&n) ){
2165                                 for (i = 0; i < size; ++i)
2166                                         val[i] = n >> (i * 8);
2167                                 if (!brev)
2168                                         byterev(val, size);
2169                                 mwrite(adrs, val, size);
2170                                 inc = size;
2171                         }
2172                         cmd = skipbl();
2173                         if (cmd == '\n')
2174                                 break;
2175                         inc = 0;
2176                         switch (cmd) {
2177                         case '\'':
2178                                 for(;;){
2179                                         n = inchar();
2180                                         if( n == '\\' )
2181                                                 n = bsesc();
2182                                         else if( n == '\'' )
2183                                                 break;
2184                                         for (i = 0; i < size; ++i)
2185                                                 val[i] = n >> (i * 8);
2186                                         if (!brev)
2187                                                 byterev(val, size);
2188                                         mwrite(adrs, val, size);
2189                                         adrs += size;
2190                                 }
2191                                 adrs -= size;
2192                                 inc = size;
2193                                 break;
2194                         case ',':
2195                                 adrs += size;
2196                                 break;
2197                         case '.':
2198                                 mnoread = 0;
2199                                 break;
2200                         case ';':
2201                                 break;
2202                         case 'x':
2203                         case EOF:
2204                                 scannl();
2205                                 return;
2206                         case 'b':
2207                         case 'v':
2208                                 size = 1;
2209                                 break;
2210                         case 'w':
2211                                 size = 2;
2212                                 break;
2213                         case 'l':
2214                                 size = 4;
2215                                 break;
2216                         case 'u':
2217                                 size = 8;
2218                                 break;
2219                         case '^':
2220                                 adrs -= size;
2221                                 break;
2222                         case '/':
2223                                 if (nslash > 0)
2224                                         adrs -= 1 << nslash;
2225                                 else
2226                                         nslash = 0;
2227                                 nslash += 4;
2228                                 adrs += 1 << nslash;
2229                                 break;
2230                         case '\\':
2231                                 if (nslash < 0)
2232                                         adrs += 1 << -nslash;
2233                                 else
2234                                         nslash = 0;
2235                                 nslash -= 4;
2236                                 adrs -= 1 << -nslash;
2237                                 break;
2238                         case 'm':
2239                                 scanhex((void *)&adrs);
2240                                 break;
2241                         case 'n':
2242                                 mnoread = 1;
2243                                 break;
2244                         case 'r':
2245                                 brev = !brev;
2246                                 break;
2247                         case '<':
2248                                 n = size;
2249                                 scanhex(&n);
2250                                 adrs -= n;
2251                                 break;
2252                         case '>':
2253                                 n = size;
2254                                 scanhex(&n);
2255                                 adrs += n;
2256                                 break;
2257                         case '?':
2258                                 printf(memex_subcmd_help_string);
2259                                 break;
2260                         }
2261                 }
2262                 adrs += inc;
2263         }
2264 }
2265 
2266 static int
2267 bsesc(void)
2268 {
2269         int c;
2270 
2271         c = inchar();
2272         switch( c ){
2273         case 'n':       c = '\n';       break;
2274         case 'r':       c = '\r';       break;
2275         case 'b':       c = '\b';       break;
2276         case 't':       c = '\t';       break;
2277         }
2278         return c;
2279 }
2280 
2281 static void xmon_rawdump (unsigned long adrs, long ndump)
2282 {
2283         long n, m, r, nr;
2284         unsigned char temp[16];
2285 
2286         for (n = ndump; n > 0;) {
2287                 r = n < 16? n: 16;
2288                 nr = mread(adrs, temp, r);
2289                 adrs += nr;
2290                 for (m = 0; m < r; ++m) {
2291                         if (m < nr)
2292                                 printf("%.2x", temp[m]);
2293                         else
2294                                 printf("%s", fault_chars[fault_type]);
2295                 }
2296                 n -= r;
2297                 if (nr < r)
2298                         break;
2299         }
2300         printf("\n");
2301 }
2302 
2303 static void dump_tracing(void)
2304 {
2305         int c;
2306 
2307         c = inchar();
2308         if (c == 'c')
2309                 ftrace_dump(DUMP_ORIG);
2310         else
2311                 ftrace_dump(DUMP_ALL);
2312 }
2313 
2314 #ifdef CONFIG_PPC64
2315 static void dump_one_paca(int cpu)
2316 {
2317         struct paca_struct *p;
2318 #ifdef CONFIG_PPC_BOOK3S_64
2319         int i = 0;
2320 #endif
2321 
2322         if (setjmp(bus_error_jmp) != 0) {
2323                 printf("*** Error dumping paca for cpu 0x%x!\n", cpu);
2324                 return;
2325         }
2326 
2327         catch_memory_errors = 1;
2328         sync();
2329 
2330         p = &paca[cpu];
2331 
2332         printf("paca for cpu 0x%x @ %px:\n", cpu, p);
2333 
2334         printf(" %-*s = %s\n", 20, "possible", cpu_possible(cpu) ? "yes" : "no");
2335         printf(" %-*s = %s\n", 20, "present", cpu_present(cpu) ? "yes" : "no");
2336         printf(" %-*s = %s\n", 20, "online", cpu_online(cpu) ? "yes" : "no");
2337 
2338 #define DUMP(paca, name, format) \
2339         printf(" %-*s = %#-*"format"\t(0x%lx)\n", 20, #name, 18, paca->name, \
2340                 offsetof(struct paca_struct, name));
2341 
2342         DUMP(p, lock_token, "x");
2343         DUMP(p, paca_index, "x");
2344         DUMP(p, kernel_toc, "lx");
2345         DUMP(p, kernelbase, "lx");
2346         DUMP(p, kernel_msr, "lx");
2347         DUMP(p, emergency_sp, "p");
2348 #ifdef CONFIG_PPC_BOOK3S_64
2349         DUMP(p, nmi_emergency_sp, "p");
2350         DUMP(p, mc_emergency_sp, "p");
2351         DUMP(p, in_nmi, "x");
2352         DUMP(p, in_mce, "x");
2353         DUMP(p, hmi_event_available, "x");
2354 #endif
2355         DUMP(p, data_offset, "lx");
2356         DUMP(p, hw_cpu_id, "x");
2357         DUMP(p, cpu_start, "x");
2358         DUMP(p, kexec_state, "x");
2359 #ifdef CONFIG_PPC_BOOK3S_64
2360         for (i = 0; i < SLB_NUM_BOLTED; i++) {
2361                 u64 esid, vsid;
2362 
2363                 if (!p->slb_shadow_ptr)
2364                         continue;
2365 
2366                 esid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].esid);
2367                 vsid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].vsid);
2368 
2369                 if (esid || vsid) {
2370                         printf(" slb_shadow[%d]:       = 0x%016lx 0x%016lx\n",
2371                                 i, esid, vsid);
2372                 }
2373         }
2374         DUMP(p, vmalloc_sllp, "x");
2375         DUMP(p, slb_cache_ptr, "x");
2376         for (i = 0; i < SLB_CACHE_ENTRIES; i++)
2377                 printf(" slb_cache[%d]:        = 0x%016lx\n", i, p->slb_cache[i]);
2378 #endif
2379         DUMP(p, dscr_default, "llx");
2380 #ifdef CONFIG_PPC_BOOK3E
2381         DUMP(p, pgd, "p");
2382         DUMP(p, kernel_pgd, "p");
2383         DUMP(p, tcd_ptr, "p");
2384         DUMP(p, mc_kstack, "p");
2385         DUMP(p, crit_kstack, "p");
2386         DUMP(p, dbg_kstack, "p");
2387 #endif
2388         DUMP(p, __current, "p");
2389         DUMP(p, kstack, "lx");
2390         printf(" kstack_base          = 0x%016lx\n", p->kstack & ~(THREAD_SIZE - 1));
2391         DUMP(p, stab_rr, "lx");
2392         DUMP(p, saved_r1, "lx");
2393         DUMP(p, trap_save, "x");
2394         DUMP(p, soft_enabled, "x");
2395         DUMP(p, irq_happened, "x");
2396         DUMP(p, io_sync, "x");
2397         DUMP(p, irq_work_pending, "x");
2398         DUMP(p, nap_state_lost, "x");
2399         DUMP(p, sprg_vdso, "llx");
2400 
2401 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2402         DUMP(p, tm_scratch, "llx");
2403 #endif
2404 
2405 #ifdef CONFIG_PPC_POWERNV
2406         DUMP(p, core_idle_state_ptr, "p");
2407         DUMP(p, thread_idle_state, "x");
2408         DUMP(p, thread_mask, "x");
2409         DUMP(p, subcore_sibling_mask, "x");
2410 #endif
2411 
2412         DUMP(p, accounting.utime, "llx");
2413         DUMP(p, accounting.stime, "llx");
2414         DUMP(p, accounting.utime_scaled, "llx");
2415         DUMP(p, accounting.starttime, "llx");
2416         DUMP(p, accounting.starttime_user, "llx");
2417         DUMP(p, accounting.startspurr, "llx");
2418         DUMP(p, accounting.utime_sspurr, "llx");
2419         DUMP(p, accounting.steal_time, "llx");
2420 #undef DUMP
2421 
2422         catch_memory_errors = 0;
2423         sync();
2424 }
2425 
2426 static void dump_all_pacas(void)
2427 {
2428         int cpu;
2429 
2430         if (num_possible_cpus() == 0) {
2431                 printf("No possible cpus, use 'dp #' to dump individual cpus\n");
2432                 return;
2433         }
2434 
2435         for_each_possible_cpu(cpu)
2436                 dump_one_paca(cpu);
2437 }
2438 
2439 static void dump_pacas(void)
2440 {
2441         unsigned long num;
2442         int c;
2443 
2444         c = inchar();
2445         if (c == 'a') {
2446                 dump_all_pacas();
2447                 return;
2448         }
2449 
2450         termch = c;     /* Put c back, it wasn't 'a' */
2451 
2452         if (scanhex(&num))
2453                 dump_one_paca(num);
2454         else
2455                 dump_one_paca(xmon_owner);
2456 }
2457 #endif
2458 
2459 #ifdef CONFIG_PPC_POWERNV
2460 static void dump_one_xive(int cpu)
2461 {
2462         unsigned int hwid = get_hard_smp_processor_id(cpu);
2463 
2464         opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
2465         opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
2466         opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
2467         opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
2468         opal_xive_dump(XIVE_DUMP_VP, hwid);
2469         opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
2470 
2471         if (setjmp(bus_error_jmp) != 0) {
2472                 catch_memory_errors = 0;
2473                 printf("*** Error dumping xive on cpu %d\n", cpu);
2474                 return;
2475         }
2476 
2477         catch_memory_errors = 1;
2478         sync();
2479         xmon_xive_do_dump(cpu);
2480         sync();
2481         __delay(200);
2482         catch_memory_errors = 0;
2483 }
2484 
2485 static void dump_all_xives(void)
2486 {
2487         int cpu;
2488 
2489         if (num_possible_cpus() == 0) {
2490                 printf("No possible cpus, use 'dx #' to dump individual cpus\n");
2491                 return;
2492         }
2493 
2494         for_each_possible_cpu(cpu)
2495                 dump_one_xive(cpu);
2496 }
2497 
2498 static void dump_one_xive_irq(u32 num)
2499 {
2500         s64 rc;
2501         __be64 vp;
2502         u8 prio;
2503         __be32 lirq;
2504 
2505         rc = opal_xive_get_irq_config(num, &vp, &prio, &lirq);
2506         xmon_printf("IRQ 0x%x config: vp=0x%llx prio=%d lirq=0x%x (rc=%lld)\n",
2507                     num, be64_to_cpu(vp), prio, be32_to_cpu(lirq), rc);
2508 }
2509 
2510 static void dump_xives(void)
2511 {
2512         unsigned long num;
2513         int c;
2514 
2515         if (!xive_enabled()) {
2516                 printf("Xive disabled on this system\n");
2517                 return;
2518         }
2519 
2520         c = inchar();
2521         if (c == 'a') {
2522                 dump_all_xives();
2523                 return;
2524         } else if (c == 'i') {
2525                 if (scanhex(&num))
2526                         dump_one_xive_irq(num);
2527                 return;
2528         }
2529 
2530         termch = c;     /* Put c back, it wasn't 'a' */
2531 
2532         if (scanhex(&num))
2533                 dump_one_xive(num);
2534         else
2535                 dump_one_xive(xmon_owner);
2536 }
2537 #endif /* CONFIG_PPC_POWERNV */
2538 
2539 static void dump_by_size(unsigned long addr, long count, int size)
2540 {
2541         unsigned char temp[16];
2542         int i, j;
2543         u64 val;
2544 
2545         count = ALIGN(count, 16);
2546 
2547         for (i = 0; i < count; i += 16, addr += 16) {
2548                 printf(REG, addr);
2549 
2550                 if (mread(addr, temp, 16) != 16) {
2551                         printf("\nFaulted reading %d bytes from 0x"REG"\n", 16, addr);
2552                         return;
2553                 }
2554 
2555                 for (j = 0; j < 16; j += size) {
2556                         putchar(' ');
2557                         switch (size) {
2558                         case 1: val = temp[j]; break;
2559                         case 2: val = *(u16 *)&temp[j]; break;
2560                         case 4: val = *(u32 *)&temp[j]; break;
2561                         case 8: val = *(u64 *)&temp[j]; break;
2562                         default: val = 0;
2563                         }
2564 
2565                         printf("%0*lx", size * 2, val);
2566                 }
2567                 printf("\n");
2568         }
2569 }
2570 
2571 static void
2572 dump(void)
2573 {
2574         static char last[] = { "d?\n" };
2575         int c;
2576 
2577         c = inchar();
2578 
2579 #ifdef CONFIG_PPC64
2580         if (c == 'p') {
2581                 xmon_start_pagination();
2582                 dump_pacas();
2583                 xmon_end_pagination();
2584                 return;
2585         }
2586 #endif
2587 #ifdef CONFIG_PPC_POWERNV
2588         if (c == 'x') {
2589                 xmon_start_pagination();
2590                 dump_xives();
2591                 xmon_end_pagination();
2592                 return;
2593         }
2594 #endif
2595 
2596         if (c == 't') {
2597                 dump_tracing();
2598                 return;
2599         }
2600 
2601         if (c == '\n')
2602                 termch = c;
2603 
2604         scanhex((void *)&adrs);
2605         if (termch != '\n')
2606                 termch = 0;
2607         if (c == 'i') {
2608                 scanhex(&nidump);
2609                 if (nidump == 0)
2610                         nidump = 16;
2611                 else if (nidump > MAX_DUMP)
2612                         nidump = MAX_DUMP;
2613                 adrs += ppc_inst_dump(adrs, nidump, 1);
2614                 last_cmd = "di\n";
2615         } else if (c == 'l') {
2616                 dump_log_buf();
2617         } else if (c == 'o') {
2618                 dump_opal_msglog();
2619         } else if (c == 'v') {
2620                 /* dump virtual to physical translation */
2621                 show_pte(adrs);
2622         } else if (c == 'r') {
2623                 scanhex(&ndump);
2624                 if (ndump == 0)
2625                         ndump = 64;
2626                 xmon_rawdump(adrs, ndump);
2627                 adrs += ndump;
2628                 last_cmd = "dr\n";
2629         } else {
2630                 scanhex(&ndump);
2631                 if (ndump == 0)
2632                         ndump = 64;
2633                 else if (ndump > MAX_DUMP)
2634                         ndump = MAX_DUMP;
2635 
2636                 switch (c) {
2637                 case '8':
2638                 case '4':
2639                 case '2':
2640                 case '1':
2641                         ndump = ALIGN(ndump, 16);
2642                         dump_by_size(adrs, ndump, c - '');
2643                         last[1] = c;
2644                         last_cmd = last;
2645                         break;
2646                 default:
2647                         prdump(adrs, ndump);
2648                         last_cmd = "d\n";
2649                 }
2650 
2651                 adrs += ndump;
2652         }
2653 }
2654 
2655 static void
2656 prdump(unsigned long adrs, long ndump)
2657 {
2658         long n, m, c, r, nr;
2659         unsigned char temp[16];
2660 
2661         for (n = ndump; n > 0;) {
2662                 printf(REG, adrs);
2663                 putchar(' ');
2664                 r = n < 16? n: 16;
2665                 nr = mread(adrs, temp, r);
2666                 adrs += nr;
2667                 for (m = 0; m < r; ++m) {
2668                         if ((m & (sizeof(long) - 1)) == 0 && m > 0)
2669                                 putchar(' ');
2670                         if (m < nr)
2671                                 printf("%.2x", temp[m]);
2672                         else
2673                                 printf("%s", fault_chars[fault_type]);
2674                 }
2675                 for (; m < 16; ++m) {
2676                         if ((m & (sizeof(long) - 1)) == 0)
2677                                 putchar(' ');
2678                         printf("  ");
2679                 }
2680                 printf("  |");
2681                 for (m = 0; m < r; ++m) {
2682                         if (m < nr) {
2683                                 c = temp[m];
2684                                 putchar(' ' <= c && c <= '~'? c: '.');
2685                         } else
2686                                 putchar(' ');
2687                 }
2688                 n -= r;
2689                 for (; m < 16; ++m)
2690                         putchar(' ');
2691                 printf("|\n");
2692                 if (nr < r)
2693                         break;
2694         }
2695 }
2696 
2697 typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr);
2698 
2699 static int
2700 generic_inst_dump(unsigned long adr, long count, int praddr,
2701                         instruction_dump_func dump_func)
2702 {
2703         int nr, dotted;
2704         unsigned long first_adr;
2705         unsigned long inst, last_inst = 0;
2706         unsigned char val[4];
2707 
2708         dotted = 0;
2709         for (first_adr = adr; count > 0; --count, adr += 4) {
2710                 nr = mread(adr, val, 4);
2711                 if (nr == 0) {
2712                         if (praddr) {
2713                                 const char *x = fault_chars[fault_type];
2714                                 printf(REG"  %s%s%s%s\n", adr, x, x, x, x);
2715                         }
2716                         break;
2717                 }
2718                 inst = GETWORD(val);
2719                 if (adr > first_adr && inst == last_inst) {
2720                         if (!dotted) {
2721                                 printf(" ...\n");
2722                                 dotted = 1;
2723                         }
2724                         continue;
2725                 }
2726                 dotted = 0;
2727                 last_inst = inst;
2728                 if (praddr)
2729                         printf(REG"  %.8x", adr, inst);
2730                 printf("\t");
2731                 dump_func(inst, adr);
2732                 printf("\n");
2733         }
2734         return adr - first_adr;
2735 }
2736 
2737 static int
2738 ppc_inst_dump(unsigned long adr, long count, int praddr)
2739 {
2740         return generic_inst_dump(adr, count, praddr, print_insn_powerpc);
2741 }
2742 
2743 void
2744 print_address(unsigned long addr)
2745 {
2746         xmon_print_symbol(addr, "\t# ", "");
2747 }
2748 
2749 void
2750 dump_log_buf(void)
2751 {
2752         struct kmsg_dumper dumper = { .active = 1 };
2753         unsigned char buf[128];
2754         size_t len;
2755 
2756         if (setjmp(bus_error_jmp) != 0) {
2757                 printf("Error dumping printk buffer!\n");
2758                 return;
2759         }
2760 
2761         catch_memory_errors = 1;
2762         sync();
2763 
2764         kmsg_dump_rewind_nolock(&dumper);
2765         xmon_start_pagination();
2766         while (kmsg_dump_get_line_nolock(&dumper, false, buf, sizeof(buf), &len)) {
2767                 buf[len] = '\0';
2768                 printf("%s", buf);
2769         }
2770         xmon_end_pagination();
2771 
2772         sync();
2773         /* wait a little while to see if we get a machine check */
2774         __delay(200);
2775         catch_memory_errors = 0;
2776 }
2777 
2778 #ifdef CONFIG_PPC_POWERNV
2779 static void dump_opal_msglog(void)
2780 {
2781         unsigned char buf[128];
2782         ssize_t res;
2783         loff_t pos = 0;
2784 
2785         if (!firmware_has_feature(FW_FEATURE_OPAL)) {
2786                 printf("Machine is not running OPAL firmware.\n");
2787                 return;
2788         }
2789 
2790         if (setjmp(bus_error_jmp) != 0) {
2791                 printf("Error dumping OPAL msglog!\n");
2792                 return;
2793         }
2794 
2795         catch_memory_errors = 1;
2796         sync();
2797 
2798         xmon_start_pagination();
2799         while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) {
2800                 if (res < 0) {
2801                         printf("Error dumping OPAL msglog! Error: %zd\n", res);
2802                         break;
2803                 }
2804                 buf[res] = '\0';
2805                 printf("%s", buf);
2806                 pos += res;
2807         }
2808         xmon_end_pagination();
2809 
2810         sync();
2811         /* wait a little while to see if we get a machine check */
2812         __delay(200);
2813         catch_memory_errors = 0;
2814 }
2815 #endif
2816 
2817 /*
2818  * Memory operations - move, set, print differences
2819  */
2820 static unsigned long mdest;             /* destination address */
2821 static unsigned long msrc;              /* source address */
2822 static unsigned long mval;              /* byte value to set memory to */
2823 static unsigned long mcount;            /* # bytes to affect */
2824 static unsigned long mdiffs;            /* max # differences to print */
2825 
2826 static void
2827 memops(int cmd)
2828 {
2829         scanhex((void *)&mdest);
2830         if( termch != '\n' )
2831                 termch = 0;
2832         scanhex((void *)(cmd == 's'? &mval: &msrc));
2833         if( termch != '\n' )
2834                 termch = 0;
2835         scanhex((void *)&mcount);
2836         switch( cmd ){
2837         case 'm':
2838                 memmove((void *)mdest, (void *)msrc, mcount);
2839                 break;
2840         case 's':
2841                 memset((void *)mdest, mval, mcount);
2842                 break;
2843         case 'd':
2844                 if( termch != '\n' )
2845                         termch = 0;
2846                 scanhex((void *)&mdiffs);
2847                 memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
2848                 break;
2849         }
2850 }
2851 
2852 static void
2853 memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
2854 {
2855         unsigned n, prt;
2856 
2857         prt = 0;
2858         for( n = nb; n > 0; --n )
2859                 if( *p1++ != *p2++ )
2860                         if( ++prt <= maxpr )
2861                                 printf("%.16x %.2x # %.16x %.2x\n", p1 - 1,
2862                                         p1[-1], p2 - 1, p2[-1]);
2863         if( prt > maxpr )
2864                 printf("Total of %d differences\n", prt);
2865 }
2866 
2867 static unsigned mend;
2868 static unsigned mask;
2869 
2870 static void
2871 memlocate(void)
2872 {
2873         unsigned a, n;
2874         unsigned char val[4];
2875 
2876         last_cmd = "ml";
2877         scanhex((void *)&mdest);
2878         if (termch != '\n') {
2879                 termch = 0;
2880                 scanhex((void *)&mend);
2881                 if (termch != '\n') {
2882                         termch = 0;
2883                         scanhex((void *)&mval);
2884                         mask = ~0;
2885                         if (termch != '\n') termch = 0;
2886                         scanhex((void *)&mask);
2887                 }
2888         }
2889         n = 0;
2890         for (a = mdest; a < mend; a += 4) {
2891                 if (mread(a, val, 4) == 4
2892                         && ((GETWORD(val) ^ mval) & mask) == 0) {
2893                         printf("%.16x:  %.16x\n", a, GETWORD(val));
2894                         if (++n >= 10)
2895                                 break;
2896                 }
2897         }
2898 }
2899 
2900 static unsigned long mskip = 0x1000;
2901 static unsigned long mlim = 0xffffffff;
2902 
2903 static void
2904 memzcan(void)
2905 {
2906         unsigned char v;
2907         unsigned a;
2908         int ok, ook;
2909 
2910         scanhex(&mdest);
2911         if (termch != '\n') termch = 0;
2912         scanhex(&mskip);
2913         if (termch != '\n') termch = 0;
2914         scanhex(&mlim);
2915         ook = 0;
2916         for (a = mdest; a < mlim; a += mskip) {
2917                 ok = mread(a, &v, 1);
2918                 if (ok && !ook) {
2919                         printf("%.8x .. ", a);
2920                 } else if (!ok && ook)
2921                         printf("%.8x\n", a - mskip);
2922                 ook = ok;
2923                 if (a + mskip < a)
2924                         break;
2925         }
2926         if (ook)
2927                 printf("%.8x\n", a - mskip);
2928 }
2929 
2930 static void show_task(struct task_struct *tsk)
2931 {
2932         char state;
2933 
2934         /*
2935          * Cloned from kdb_task_state_char(), which is not entirely
2936          * appropriate for calling from xmon. This could be moved
2937          * to a common, generic, routine used by both.
2938          */
2939         state = (tsk->state == 0) ? 'R' :
2940                 (tsk->state < 0) ? 'U' :
2941                 (tsk->state & TASK_UNINTERRUPTIBLE) ? 'D' :
2942                 (tsk->state & TASK_STOPPED) ? 'T' :
2943                 (tsk->state & TASK_TRACED) ? 'C' :
2944                 (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' :
2945                 (tsk->exit_state & EXIT_DEAD) ? 'E' :
2946                 (tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
2947 
2948         printf("%px %016lx %6d %6d %c %2d %s\n", tsk,
2949                 tsk->thread.ksp,
2950                 tsk->pid, tsk->parent->pid,
2951                 state, task_thread_info(tsk)->cpu,
2952                 tsk->comm);
2953 }
2954 
2955 #ifdef CONFIG_PPC_BOOK3S_64
2956 void format_pte(void *ptep, unsigned long pte)
2957 {
2958         printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte);
2959         printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK);
2960 
2961         printf("Flags = %s%s%s%s%s\n",
2962                (pte & _PAGE_ACCESSED) ? "Accessed " : "",
2963                (pte & _PAGE_DIRTY)    ? "Dirty " : "",
2964                (pte & _PAGE_READ)     ? "Read " : "",
2965                (pte & _PAGE_WRITE)    ? "Write " : "",
2966                (pte & _PAGE_EXEC)     ? "Exec " : "");
2967 }
2968 
2969 static void show_pte(unsigned long addr)
2970 {
2971         unsigned long tskv = 0;
2972         struct task_struct *tsk = NULL;
2973         struct mm_struct *mm;
2974         pgd_t *pgdp, *pgdir;
2975         pud_t *pudp;
2976         pmd_t *pmdp;
2977         pte_t *ptep;
2978 
2979         if (!scanhex(&tskv))
2980                 mm = &init_mm;
2981         else
2982                 tsk = (struct task_struct *)tskv;
2983 
2984         if (tsk == NULL)
2985                 mm = &init_mm;
2986         else
2987                 mm = tsk->active_mm;
2988 
2989         if (setjmp(bus_error_jmp) != 0) {
2990                 catch_memory_errors = 0;
2991                 printf("*** Error dumping pte for task %px\n", tsk);
2992                 return;
2993         }
2994 
2995         catch_memory_errors = 1;
2996         sync();
2997 
2998         if (mm == &init_mm) {
2999                 pgdp = pgd_offset_k(addr);
3000                 pgdir = pgd_offset_k(0);
3001         } else {
3002                 pgdp = pgd_offset(mm, addr);
3003                 pgdir = pgd_offset(mm, 0);
3004         }
3005 
3006         if (pgd_none(*pgdp)) {
3007                 printf("no linux page table for address\n");
3008                 return;
3009         }
3010 
3011         printf("pgd  @ 0x%016lx\n", pgdir);
3012 
3013         if (pgd_huge(*pgdp)) {
3014                 format_pte(pgdp, pgd_val(*pgdp));
3015                 return;
3016         }
3017         printf("pgdp @ 0x%016lx = 0x%016lx\n", pgdp, pgd_val(*pgdp));
3018 
3019         pudp = pud_offset(pgdp, addr);
3020 
3021         if (pud_none(*pudp)) {
3022                 printf("No valid PUD\n");
3023                 return;
3024         }
3025 
3026         if (pud_huge(*pudp)) {
3027                 format_pte(pudp, pud_val(*pudp));
3028                 return;
3029         }
3030 
3031         printf("pudp @ 0x%016lx = 0x%016lx\n", pudp, pud_val(*pudp));
3032 
3033         pmdp = pmd_offset(pudp, addr);
3034 
3035         if (pmd_none(*pmdp)) {
3036                 printf("No valid PMD\n");
3037                 return;
3038         }
3039 
3040         if (pmd_huge(*pmdp)) {
3041                 format_pte(pmdp, pmd_val(*pmdp));
3042                 return;
3043         }
3044         printf("pmdp @ 0x%016lx = 0x%016lx\n", pmdp, pmd_val(*pmdp));
3045 
3046         ptep = pte_offset_map(pmdp, addr);
3047         if (pte_none(*ptep)) {
3048                 printf("no valid PTE\n");
3049                 return;
3050         }
3051 
3052         format_pte(ptep, pte_val(*ptep));
3053 
3054         sync();
3055         __delay(200);
3056         catch_memory_errors = 0;
3057 }
3058 #else
3059 static void show_pte(unsigned long addr)
3060 {
3061         printf("show_pte not yet implemented\n");
3062 }
3063 #endif /* CONFIG_PPC_BOOK3S_64 */
3064 
3065 static void show_tasks(void)
3066 {
3067         unsigned long tskv;
3068         struct task_struct *tsk = NULL;
3069 
3070         printf("     task_struct     ->thread.ksp    PID   PPID S  P CMD\n");
3071 
3072         if (scanhex(&tskv))
3073                 tsk = (struct task_struct *)tskv;
3074 
3075         if (setjmp(bus_error_jmp) != 0) {
3076                 catch_memory_errors = 0;
3077                 printf("*** Error dumping task %px\n", tsk);
3078                 return;
3079         }
3080 
3081         catch_memory_errors = 1;
3082         sync();
3083 
3084         if (tsk)
3085                 show_task(tsk);
3086         else
3087                 for_each_process(tsk)
3088                         show_task(tsk);
3089 
3090         sync();
3091         __delay(200);
3092         catch_memory_errors = 0;
3093 }
3094 
3095 static void proccall(void)
3096 {
3097         unsigned long args[8];
3098         unsigned long ret;
3099         int i;
3100         typedef unsigned long (*callfunc_t)(unsigned long, unsigned long,
3101                         unsigned long, unsigned long, unsigned long,
3102                         unsigned long, unsigned long, unsigned long);
3103         callfunc_t func;
3104 
3105         if (!scanhex(&adrs))
3106                 return;
3107         if (termch != '\n')
3108                 termch = 0;
3109         for (i = 0; i < 8; ++i)
3110                 args[i] = 0;
3111         for (i = 0; i < 8; ++i) {
3112                 if (!scanhex(&args[i]) || termch == '\n')
3113                         break;
3114                 termch = 0;
3115         }
3116         func = (callfunc_t) adrs;
3117         ret = 0;
3118         if (setjmp(bus_error_jmp) == 0) {
3119                 catch_memory_errors = 1;
3120                 sync();
3121                 ret = func(args[0], args[1], args[2], args[3],
3122                            args[4], args[5], args[6], args[7]);
3123                 sync();
3124                 printf("return value is 0x%lx\n", ret);
3125         } else {
3126                 printf("*** %x exception occurred\n", fault_except);
3127         }
3128         catch_memory_errors = 0;
3129 }
3130 
3131 /* Input scanning routines */
3132 int
3133 skipbl(void)
3134 {
3135         int c;
3136 
3137         if( termch != 0 ){
3138                 c = termch;
3139                 termch = 0;
3140         } else
3141                 c = inchar();
3142         while( c == ' ' || c == '\t' )
3143                 c = inchar();
3144         return c;
3145 }
3146 
3147 #define N_PTREGS        44
3148 static char *regnames[N_PTREGS] = {
3149         "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
3150         "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
3151         "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
3152         "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
3153         "pc", "msr", "or3", "ctr", "lr", "xer", "ccr",
3154 #ifdef CONFIG_PPC64
3155         "softe",
3156 #else
3157         "mq",
3158 #endif
3159         "trap", "dar", "dsisr", "res"
3160 };
3161 
3162 int
3163 scanhex(unsigned long *vp)
3164 {
3165         int c, d;
3166         unsigned long v;
3167 
3168         c = skipbl();
3169         if (c == '%') {
3170                 /* parse register name */
3171                 char regname[8];
3172                 int i;
3173 
3174                 for (i = 0; i < sizeof(regname) - 1; ++i) {
3175                         c = inchar();
3176                         if (!isalnum(c)) {
3177                                 termch = c;
3178                                 break;
3179                         }
3180                         regname[i] = c;
3181                 }
3182                 regname[i] = 0;
3183                 for (i = 0; i < N_PTREGS; ++i) {
3184                         if (strcmp(regnames[i], regname) == 0) {
3185                                 if (xmon_regs == NULL) {
3186                                         printf("regs not available\n");
3187                                         return 0;
3188                                 }
3189                                 *vp = ((unsigned long *)xmon_regs)[i];
3190                                 return 1;
3191                         }
3192                 }
3193                 printf("invalid register name '%%%s'\n", regname);
3194                 return 0;
3195         }
3196 
3197         /* skip leading "0x" if any */
3198 
3199         if (c == '') {
3200                 c = inchar();
3201                 if (c == 'x') {
3202                         c = inchar();
3203                 } else {
3204                         d = hexdigit(c);
3205                         if (d == EOF) {
3206                                 termch = c;
3207                                 *vp = 0;
3208                                 return 1;
3209                         }
3210                 }
3211         } else if (c == '$') {
3212                 int i;
3213                 for (i=0; i<63; i++) {
3214                         c = inchar();
3215                         if (isspace(c) || c == '\0') {
3216                                 termch = c;
3217                                 break;
3218                         }
3219                         tmpstr[i] = c;
3220                 }
3221                 tmpstr[i++] = 0;
3222                 *vp = 0;
3223                 if (setjmp(bus_error_jmp) == 0) {
3224                         catch_memory_errors = 1;
3225                         sync();
3226                         *vp = kallsyms_lookup_name(tmpstr);
3227                         sync();
3228                 }
3229                 catch_memory_errors = 0;
3230                 if (!(*vp)) {
3231                         printf("unknown symbol '%s'\n", tmpstr);
3232                         return 0;
3233                 }
3234                 return 1;
3235         }
3236 
3237         d = hexdigit(c);
3238         if (d == EOF) {
3239                 termch = c;
3240                 return 0;
3241         }
3242         v = 0;
3243         do {
3244                 v = (v << 4) + d;
3245                 c = inchar();
3246                 d = hexdigit(c);
3247         } while (d != EOF);
3248         termch = c;
3249         *vp = v;
3250         return 1;
3251 }
3252 
3253 static void
3254 scannl(void)
3255 {
3256         int c;
3257 
3258         c = termch;
3259         termch = 0;
3260         while( c != '\n' )
3261                 c = inchar();
3262 }
3263 
3264 static int hexdigit(int c)
3265 {
3266         if( '' <= c && c <= '9' )
3267                 return c - '';
3268         if( 'A' <= c && c <= 'F' )
3269                 return c - ('A' - 10);
3270         if( 'a' <= c && c <= 'f' )
3271                 return c - ('a' - 10);
3272         return EOF;
3273 }
3274 
3275 void
3276 getstring(char *s, int size)
3277 {
3278         int c;
3279 
3280         c = skipbl();
3281         do {
3282                 if( size > 1 ){
3283                         *s++ = c;
3284                         --size;
3285                 }
3286                 c = inchar();
3287         } while( c != ' ' && c != '\t' && c != '\n' );
3288         termch = c;
3289         *s = 0;
3290 }
3291 
3292 static char line[256];
3293 static char *lineptr;
3294 
3295 static void
3296 flush_input(void)
3297 {
3298         lineptr = NULL;
3299 }
3300 
3301 static int
3302 inchar(void)
3303 {
3304         if (lineptr == NULL || *lineptr == 0) {
3305                 if (xmon_gets(line, sizeof(line)) == NULL) {
3306                         lineptr = NULL;
3307                         return EOF;
3308                 }
3309                 lineptr = line;
3310         }
3311         return *lineptr++;
3312 }
3313 
3314 static void
3315 take_input(char *str)
3316 {
3317         lineptr = str;
3318 }
3319 
3320 
3321 static void
3322 symbol_lookup(void)
3323 {
3324         int type = inchar();
3325         unsigned long addr;
3326         static char tmp[64];
3327 
3328         switch (type) {
3329         case 'a':
3330                 if (scanhex(&addr))
3331                         xmon_print_symbol(addr, ": ", "\n");
3332                 termch = 0;
3333                 break;
3334         case 's':
3335                 getstring(tmp, 64);
3336                 if (setjmp(bus_error_jmp) == 0) {
3337                         catch_memory_errors = 1;
3338                         sync();
3339                         addr = kallsyms_lookup_name(tmp);
3340                         if (addr)
3341                                 printf("%s: %lx\n", tmp, addr);
3342                         else
3343                                 printf("Symbol '%s' not found.\n", tmp);
3344                         sync();
3345                 }
3346                 catch_memory_errors = 0;
3347                 termch = 0;
3348                 break;
3349         }
3350 }
3351 
3352 
3353 /* Print an address in numeric and symbolic form (if possible) */
3354 static void xmon_print_symbol(unsigned long address, const char *mid,
3355                               const char *after)
3356 {
3357         char *modname;
3358         const char *name = NULL;
3359         unsigned long offset, size;
3360 
3361         printf(REG, address);
3362         if (setjmp(bus_error_jmp) == 0) {
3363                 catch_memory_errors = 1;
3364                 sync();
3365                 name = kallsyms_lookup(address, &size, &offset, &modname,
3366                                        tmpstr);
3367                 sync();
3368                 /* wait a little while to see if we get a machine check */
3369                 __delay(200);
3370         }
3371 
3372         catch_memory_errors = 0;
3373 
3374         if (name) {
3375                 printf("%s%s+%#lx/%#lx", mid, name, offset, size);
3376                 if (modname)
3377                         printf(" [%s]", modname);
3378         }
3379         printf("%s", after);
3380 }
3381 
3382 #ifdef CONFIG_PPC_BOOK3S_64
3383 void dump_segments(void)
3384 {
3385         int i;
3386         unsigned long esid,vsid;
3387         unsigned long llp;
3388 
3389         printf("SLB contents of cpu 0x%x\n", smp_processor_id());
3390 
3391         for (i = 0; i < mmu_slb_size; i++) {
3392                 asm volatile("slbmfee  %0,%1" : "=r" (esid) : "r" (i));
3393                 asm volatile("slbmfev  %0,%1" : "=r" (vsid) : "r" (i));
3394 
3395                 if (!esid && !vsid)
3396                         continue;
3397 
3398                 printf("%02d %016lx %016lx", i, esid, vsid);
3399 
3400                 if (!(esid & SLB_ESID_V)) {
3401                         printf("\n");
3402                         continue;
3403                 }
3404 
3405                 llp = vsid & SLB_VSID_LLP;
3406                 if (vsid & SLB_VSID_B_1T) {
3407                         printf("  1T  ESID=%9lx  VSID=%13lx LLP:%3lx \n",
3408                                 GET_ESID_1T(esid),
3409                                 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
3410                                 llp);
3411                 } else {
3412                         printf(" 256M ESID=%9lx  VSID=%13lx LLP:%3lx \n",
3413                                 GET_ESID(esid),
3414                                 (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
3415                                 llp);
3416                 }
3417         }
3418 }
3419 #endif
3420 
3421 #ifdef CONFIG_PPC_STD_MMU_32
3422 void dump_segments(void)
3423 {
3424         int i;
3425 
3426         printf("sr0-15 =");
3427         for (i = 0; i < 16; ++i)
3428                 printf(" %x", mfsrin(i));
3429         printf("\n");
3430 }
3431 #endif
3432 
3433 #ifdef CONFIG_44x
3434 static void dump_tlb_44x(void)
3435 {
3436         int i;
3437 
3438         for (i = 0; i < PPC44x_TLB_SIZE; i++) {
3439                 unsigned long w0,w1,w2;
3440                 asm volatile("tlbre  %0,%1,0" : "=r" (w0) : "r" (i));
3441                 asm volatile("tlbre  %0,%1,1" : "=r" (w1) : "r" (i));
3442                 asm volatile("tlbre  %0,%1,2" : "=r" (w2) : "r" (i));
3443                 printf("[%02x] %08x %08x %08x ", i, w0, w1, w2);
3444                 if (w0 & PPC44x_TLB_VALID) {
3445                         printf("V %08x -> %01x%08x %c%c%c%c%c",
3446                                w0 & PPC44x_TLB_EPN_MASK,
3447                                w1 & PPC44x_TLB_ERPN_MASK,
3448                                w1 & PPC44x_TLB_RPN_MASK,
3449                                (w2 & PPC44x_TLB_W) ? 'W' : 'w',
3450                                (w2 & PPC44x_TLB_I) ? 'I' : 'i',
3451                                (w2 & PPC44x_TLB_M) ? 'M' : 'm',
3452                                (w2 & PPC44x_TLB_G) ? 'G' : 'g',
3453                                (w2 & PPC44x_TLB_E) ? 'E' : 'e');
3454                 }
3455                 printf("\n");
3456         }
3457 }
3458 #endif /* CONFIG_44x */
3459 
3460 #ifdef CONFIG_PPC_BOOK3E
3461 static void dump_tlb_book3e(void)
3462 {
3463         u32 mmucfg, pidmask, lpidmask;
3464         u64 ramask;
3465         int i, tlb, ntlbs, pidsz, lpidsz, rasz, lrat = 0;
3466         int mmu_version;
3467         static const char *pgsz_names[] = {
3468                 "  1K",
3469                 "  2K",
3470                 "  4K",
3471                 "  8K",
3472                 " 16K",
3473                 " 32K",
3474                 " 64K",
3475                 "128K",
3476                 "256K",
3477                 "512K",
3478                 "  1M",
3479                 "  2M",
3480                 "  4M",
3481                 "  8M",
3482                 " 16M",
3483                 " 32M",
3484                 " 64M",
3485                 "128M",
3486                 "256M",
3487                 "512M",
3488                 "  1G",
3489                 "  2G",
3490                 "  4G",
3491                 "  8G",
3492                 " 16G",
3493                 " 32G",
3494                 " 64G",
3495                 "128G",
3496                 "256G",
3497                 "512G",
3498                 "  1T",
3499                 "  2T",
3500         };
3501 
3502         /* Gather some infos about the MMU */
3503         mmucfg = mfspr(SPRN_MMUCFG);
3504         mmu_version = (mmucfg & 3) + 1;
3505         ntlbs = ((mmucfg >> 2) & 3) + 1;
3506         pidsz = ((mmucfg >> 6) & 0x1f) + 1;
3507         lpidsz = (mmucfg >> 24) & 0xf;
3508         rasz = (mmucfg >> 16) & 0x7f;
3509         if ((mmu_version > 1) && (mmucfg & 0x10000))
3510                 lrat = 1;
3511         printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n",
3512                mmu_version, ntlbs, pidsz, lpidsz, rasz);
3513         pidmask = (1ul << pidsz) - 1;
3514         lpidmask = (1ul << lpidsz) - 1;
3515         ramask = (1ull << rasz) - 1;
3516 
3517         for (tlb = 0; tlb < ntlbs; tlb++) {
3518                 u32 tlbcfg;
3519                 int nent, assoc, new_cc = 1;
3520                 printf("TLB %d:\n------\n", tlb);
3521                 switch(tlb) {
3522                 case 0:
3523                         tlbcfg = mfspr(SPRN_TLB0CFG);
3524                         break;
3525                 case 1:
3526                         tlbcfg = mfspr(SPRN_TLB1CFG);
3527                         break;
3528                 case 2:
3529                         tlbcfg = mfspr(SPRN_TLB2CFG);
3530                         break;
3531                 case 3:
3532                         tlbcfg = mfspr(SPRN_TLB3CFG);
3533                         break;
3534                 default:
3535                         printf("Unsupported TLB number !\n");
3536                         continue;
3537                 }
3538                 nent = tlbcfg & 0xfff;
3539                 assoc = (tlbcfg >> 24) & 0xff;
3540                 for (i = 0; i < nent; i++) {
3541                         u32 mas0 = MAS0_TLBSEL(tlb);
3542                         u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K);
3543                         u64 mas2 = 0;
3544                         u64 mas7_mas3;
3545                         int esel = i, cc = i;
3546 
3547                         if (assoc != 0) {
3548                                 cc = i / assoc;
3549                                 esel = i % assoc;
3550                                 mas2 = cc * 0x1000;
3551                         }
3552 
3553                         mas0 |= MAS0_ESEL(esel);
3554                         mtspr(SPRN_MAS0, mas0);
3555                         mtspr(SPRN_MAS1, mas1);
3556                         mtspr(SPRN_MAS2, mas2);
3557                         asm volatile("tlbre  0,0,0" : : : "memory");
3558                         mas1 = mfspr(SPRN_MAS1);
3559                         mas2 = mfspr(SPRN_MAS2);
3560                         mas7_mas3 = mfspr(SPRN_MAS7_MAS3);
3561                         if (assoc && (i % assoc) == 0)
3562                                 new_cc = 1;
3563                         if (!(mas1 & MAS1_VALID))
3564                                 continue;
3565                         if (assoc == 0)
3566                                 printf("%04x- ", i);
3567                         else if (new_cc)
3568                                 printf("%04x-%c", cc, 'A' + esel);
3569                         else
3570                                 printf("    |%c", 'A' + esel);
3571                         new_cc = 0;
3572                         printf(" %016llx %04x %s %c%c AS%c",
3573                                mas2 & ~0x3ffull,
3574                                (mas1 >> 16) & 0x3fff,
3575                                pgsz_names[(mas1 >> 7) & 0x1f],
3576                                mas1 & MAS1_IND ? 'I' : ' ',
3577                                mas1 & MAS1_IPROT ? 'P' : ' ',
3578                                mas1 & MAS1_TS ? '1' : '');
3579                         printf(" %c%c%c%c%c%c%c",
3580                                mas2 & MAS2_X0 ? 'a' : ' ',
3581                                mas2 & MAS2_X1 ? 'v' : ' ',
3582                                mas2 & MAS2_W  ? 'w' : ' ',
3583                                mas2 & MAS2_I  ? 'i' : ' ',
3584                                mas2 & MAS2_M  ? 'm' : ' ',
3585                                mas2 & MAS2_G  ? 'g' : ' ',
3586                                mas2 & MAS2_E  ? 'e' : ' ');
3587                         printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull);
3588                         if (mas1 & MAS1_IND)
3589                                 printf(" %s\n",
3590                                        pgsz_names[(mas7_mas3 >> 1) & 0x1f]);
3591                         else
3592                                 printf(" U%c%c%c S%c%c%c\n",
3593                                        mas7_mas3 & MAS3_UX ? 'x' : ' ',
3594                                        mas7_mas3 & MAS3_UW ? 'w' : ' ',
3595                                        mas7_mas3 & MAS3_UR ? 'r' : ' ',
3596                                        mas7_mas3 & MAS3_SX ? 'x' : ' ',
3597                                        mas7_mas3 & MAS3_SW ? 'w' : ' ',
3598                                        mas7_mas3 & MAS3_SR ? 'r' : ' ');
3599                 }
3600         }
3601 }
3602 #endif /* CONFIG_PPC_BOOK3E */
3603 
3604 static void xmon_init(int enable)
3605 {
3606         if (enable) {
3607                 __debugger = xmon;
3608                 __debugger_ipi = xmon_ipi;
3609                 __debugger_bpt = xmon_bpt;
3610                 __debugger_sstep = xmon_sstep;
3611                 __debugger_iabr_match = xmon_iabr_match;
3612                 __debugger_break_match = xmon_break_match;
3613                 __debugger_fault_handler = xmon_fault_handler;
3614         } else {
3615                 __debugger = NULL;
3616                 __debugger_ipi = NULL;
3617                 __debugger_bpt = NULL;
3618                 __debugger_sstep = NULL;
3619                 __debugger_iabr_match = NULL;
3620                 __debugger_break_match = NULL;
3621                 __debugger_fault_handler = NULL;
3622         }
3623 }
3624 
3625 #ifdef CONFIG_MAGIC_SYSRQ
3626 static void sysrq_handle_xmon(int key)
3627 {
3628         /* ensure xmon is enabled */
3629         xmon_init(1);
3630         debugger(get_irq_regs());
3631         if (!xmon_on)
3632                 xmon_init(0);
3633 }
3634 
3635 static struct sysrq_key_op sysrq_xmon_op = {
3636         .handler =      sysrq_handle_xmon,
3637         .help_msg =     "xmon(x)",
3638         .action_msg =   "Entering xmon",
3639 };
3640 
3641 static int __init setup_xmon_sysrq(void)
3642 {
3643         register_sysrq_key('x', &sysrq_xmon_op);
3644         return 0;
3645 }
3646 device_initcall(setup_xmon_sysrq);
3647 #endif /* CONFIG_MAGIC_SYSRQ */
3648 
3649 #ifdef CONFIG_DEBUG_FS
3650 static int xmon_dbgfs_set(void *data, u64 val)
3651 {
3652         xmon_on = !!val;
3653         xmon_init(xmon_on);
3654 
3655         return 0;
3656 }
3657 
3658 static int xmon_dbgfs_get(void *data, u64 *val)
3659 {
3660         *val = xmon_on;
3661         return 0;
3662 }
3663 
3664 DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get,
3665                         xmon_dbgfs_set, "%llu\n");
3666 
3667 static int __init setup_xmon_dbgfs(void)
3668 {
3669         debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL,
3670                                 &xmon_dbgfs_ops);
3671         return 0;
3672 }
3673 device_initcall(setup_xmon_dbgfs);
3674 #endif /* CONFIG_DEBUG_FS */
3675 
3676 static int xmon_early __initdata;
3677 
3678 static int __init early_parse_xmon(char *p)
3679 {
3680         if (!p || strncmp(p, "early", 5) == 0) {
3681                 /* just "xmon" is equivalent to "xmon=early" */
3682                 xmon_init(1);
3683                 xmon_early = 1;
3684                 xmon_on = 1;
3685         } else if (strncmp(p, "on", 2) == 0) {
3686                 xmon_init(1);
3687                 xmon_on = 1;
3688         } else if (strncmp(p, "off", 3) == 0)
3689                 xmon_on = 0;
3690         else
3691                 return 1;
3692 
3693         return 0;
3694 }
3695 early_param("xmon", early_parse_xmon);
3696 
3697 void __init xmon_setup(void)
3698 {
3699         if (xmon_on)
3700                 xmon_init(1);
3701         if (xmon_early)
3702                 debugger(NULL);
3703 }
3704 
3705 #ifdef CONFIG_SPU_BASE
3706 
3707 struct spu_info {
3708         struct spu *spu;
3709         u64 saved_mfc_sr1_RW;
3710         u32 saved_spu_runcntl_RW;
3711         unsigned long dump_addr;
3712         u8 stopped_ok;
3713 };
3714 
3715 #define XMON_NUM_SPUS   16      /* Enough for current hardware */
3716 
3717 static struct spu_info spu_info[XMON_NUM_SPUS];
3718 
3719 void xmon_register_spus(struct list_head *list)
3720 {
3721         struct spu *spu;
3722 
3723         list_for_each_entry(spu, list, full_list) {
3724                 if (spu->number >= XMON_NUM_SPUS) {
3725                         WARN_ON(1);
3726                         continue;
3727                 }
3728 
3729                 spu_info[spu->number].spu = spu;
3730                 spu_info[spu->number].stopped_ok = 0;
3731                 spu_info[spu->number].dump_addr = (unsigned long)
3732                                 spu_info[spu->number].spu->local_store;
3733         }
3734 }
3735 
3736 static void stop_spus(void)
3737 {
3738         struct spu *spu;
3739         int i;
3740         u64 tmp;
3741 
3742         for (i = 0; i < XMON_NUM_SPUS; i++) {
3743                 if (!spu_info[i].spu)
3744                         continue;
3745 
3746                 if (setjmp(bus_error_jmp) == 0) {
3747                         catch_memory_errors = 1;
3748                         sync();
3749 
3750                         spu = spu_info[i].spu;
3751 
3752                         spu_info[i].saved_spu_runcntl_RW =
3753                                 in_be32(&spu->problem->spu_runcntl_RW);
3754 
3755                         tmp = spu_mfc_sr1_get(spu);
3756                         spu_info[i].saved_mfc_sr1_RW = tmp;
3757 
3758                         tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK;
3759                         spu_mfc_sr1_set(spu, tmp);
3760 
3761                         sync();
3762                         __delay(200);
3763 
3764                         spu_info[i].stopped_ok = 1;
3765 
3766                         printf("Stopped spu %.2d (was %s)\n", i,
3767                                         spu_info[i].saved_spu_runcntl_RW ?
3768                                         "running" : "stopped");
3769                 } else {
3770                         catch_memory_errors = 0;
3771                         printf("*** Error stopping spu %.2d\n", i);
3772                 }
3773                 catch_memory_errors = 0;
3774         }
3775 }
3776 
3777 static void restart_spus(void)
3778 {
3779         struct spu *spu;
3780         int i;
3781 
3782         for (i = 0; i < XMON_NUM_SPUS; i++) {
3783                 if (!spu_info[i].spu)
3784                         continue;
3785 
3786                 if (!spu_info[i].stopped_ok) {
3787                         printf("*** Error, spu %d was not successfully stopped"
3788                                         ", not restarting\n", i);
3789                         continue;
3790                 }
3791 
3792                 if (setjmp(bus_error_jmp) == 0) {
3793                         catch_memory_errors = 1;
3794                         sync();
3795 
3796                         spu = spu_info[i].spu;
3797                         spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW);
3798                         out_be32(&spu->problem->spu_runcntl_RW,
3799                                         spu_info[i].saved_spu_runcntl_RW);
3800 
3801                         sync();
3802                         __delay(200);
3803 
3804                         printf("Restarted spu %.2d\n", i);
3805                 } else {
3806                         catch_memory_errors = 0;
3807                         printf("*** Error restarting spu %.2d\n", i);
3808                 }
3809                 catch_memory_errors = 0;
3810         }
3811 }
3812 
3813 #define DUMP_WIDTH      23
3814 #define DUMP_VALUE(format, field, value)                                \
3815 do {                                                                    \
3816         if (setjmp(bus_error_jmp) == 0) {                               \
3817                 catch_memory_errors = 1;                                \
3818                 sync();                                                 \
3819                 printf("  %-*s = "format"\n", DUMP_WIDTH,               \
3820                                 #field, value);                         \
3821                 sync();                                                 \
3822                 __delay(200);                                           \
3823         } else {                                                        \
3824                 catch_memory_errors = 0;                                \
3825                 printf("  %-*s = *** Error reading field.\n",           \
3826                                         DUMP_WIDTH, #field);            \
3827         }                                                               \
3828         catch_memory_errors = 0;                                        \
3829 } while (0)
3830 
3831 #define DUMP_FIELD(obj, format, field)  \
3832         DUMP_VALUE(format, field, obj->field)
3833 
3834 static void dump_spu_fields(struct spu *spu)
3835 {
3836         printf("Dumping spu fields at address %p:\n", spu);
3837 
3838         DUMP_FIELD(spu, "0x%x", number);
3839         DUMP_FIELD(spu, "%s", name);
3840         DUMP_FIELD(spu, "0x%lx", local_store_phys);
3841         DUMP_FIELD(spu, "0x%p", local_store);
3842         DUMP_FIELD(spu, "0x%lx", ls_size);
3843         DUMP_FIELD(spu, "0x%x", node);
3844         DUMP_FIELD(spu, "0x%lx", flags);
3845         DUMP_FIELD(spu, "%d", class_0_pending);
3846         DUMP_FIELD(spu, "0x%lx", class_0_dar);
3847         DUMP_FIELD(spu, "0x%lx", class_1_dar);
3848         DUMP_FIELD(spu, "0x%lx", class_1_dsisr);
3849         DUMP_FIELD(spu, "0x%lx", irqs[0]);
3850         DUMP_FIELD(spu, "0x%lx", irqs[1]);
3851         DUMP_FIELD(spu, "0x%lx", irqs[2]);
3852         DUMP_FIELD(spu, "0x%x", slb_replace);
3853         DUMP_FIELD(spu, "%d", pid);
3854         DUMP_FIELD(spu, "0x%p", mm);
3855         DUMP_FIELD(spu, "0x%p", ctx);
3856         DUMP_FIELD(spu, "0x%p", rq);
3857         DUMP_FIELD(spu, "0x%p", timestamp);
3858         DUMP_FIELD(spu, "0x%lx", problem_phys);
3859         DUMP_FIELD(spu, "0x%p", problem);
3860         DUMP_VALUE("0x%x", problem->spu_runcntl_RW,
3861                         in_be32(&spu->problem->spu_runcntl_RW));
3862         DUMP_VALUE("0x%x", problem->spu_status_R,
3863                         in_be32(&spu->problem->spu_status_R));
3864         DUMP_VALUE("0x%x", problem->spu_npc_RW,
3865                         in_be32(&spu->problem->spu_npc_RW));
3866         DUMP_FIELD(spu, "0x%p", priv2);
3867         DUMP_FIELD(spu, "0x%p", pdata);
3868 }
3869 
3870 int
3871 spu_inst_dump(unsigned long adr, long count, int praddr)
3872 {
3873         return generic_inst_dump(adr, count, praddr, print_insn_spu);
3874 }
3875 
3876 static void dump_spu_ls(unsigned long num, int subcmd)
3877 {
3878         unsigned long offset, addr, ls_addr;
3879 
3880         if (setjmp(bus_error_jmp) == 0) {
3881                 catch_memory_errors = 1;
3882                 sync();
3883                 ls_addr = (unsigned long)spu_info[num].spu->local_store;
3884                 sync();
3885                 __delay(200);
3886         } else {
3887                 catch_memory_errors = 0;
3888                 printf("*** Error: accessing spu info for spu %d\n", num);
3889                 return;
3890         }
3891         catch_memory_errors = 0;
3892 
3893         if (scanhex(&offset))
3894                 addr = ls_addr + offset;
3895         else
3896                 addr = spu_info[num].dump_addr;
3897 
3898         if (addr >= ls_addr + LS_SIZE) {
3899                 printf("*** Error: address outside of local store\n");
3900                 return;
3901         }
3902 
3903         switch (subcmd) {
3904         case 'i':
3905                 addr += spu_inst_dump(addr, 16, 1);
3906                 last_cmd = "sdi\n";
3907                 break;
3908         default:
3909                 prdump(addr, 64);
3910                 addr += 64;
3911                 last_cmd = "sd\n";
3912                 break;
3913         }
3914 
3915         spu_info[num].dump_addr = addr;
3916 }
3917 
3918 static int do_spu_cmd(void)
3919 {
3920         static unsigned long num = 0;
3921         int cmd, subcmd = 0;
3922 
3923         cmd = inchar();
3924         switch (cmd) {
3925         case 's':
3926                 stop_spus();
3927                 break;
3928         case 'r':
3929                 restart_spus();
3930                 break;
3931         case 'd':
3932                 subcmd = inchar();
3933                 if (isxdigit(subcmd) || subcmd == '\n')
3934                         termch = subcmd;
3935         case 'f':
3936                 scanhex(&num);
3937                 if (num >= XMON_NUM_SPUS || !spu_info[num].spu) {
3938                         printf("*** Error: invalid spu number\n");
3939                         return 0;
3940                 }
3941 
3942                 switch (cmd) {
3943                 case 'f':
3944                         dump_spu_fields(spu_info[num].spu);
3945                         break;
3946                 default:
3947                         dump_spu_ls(num, subcmd);
3948                         break;
3949                 }
3950 
3951                 break;
3952         default:
3953                 return -1;
3954         }
3955 
3956         return 0;
3957 }
3958 #else /* ! CONFIG_SPU_BASE */
3959 static int do_spu_cmd(void)
3960 {
3961         return -1;
3962 }
3963 #endif
3964 

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