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Linux/arch/parisc/kernel/traps.c

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  1 /*
  2  *  linux/arch/parisc/traps.c
  3  *
  4  *  Copyright (C) 1991, 1992  Linus Torvalds
  5  *  Copyright (C) 1999, 2000  Philipp Rumpf <prumpf@tux.org>
  6  */
  7 
  8 /*
  9  * 'Traps.c' handles hardware traps and faults after we have saved some
 10  * state in 'asm.s'.
 11  */
 12 
 13 #include <linux/sched.h>
 14 #include <linux/kernel.h>
 15 #include <linux/string.h>
 16 #include <linux/errno.h>
 17 #include <linux/ptrace.h>
 18 #include <linux/timer.h>
 19 #include <linux/delay.h>
 20 #include <linux/mm.h>
 21 #include <linux/module.h>
 22 #include <linux/smp.h>
 23 #include <linux/spinlock.h>
 24 #include <linux/init.h>
 25 #include <linux/interrupt.h>
 26 #include <linux/console.h>
 27 #include <linux/bug.h>
 28 
 29 #include <asm/assembly.h>
 30 #include <asm/uaccess.h>
 31 #include <asm/io.h>
 32 #include <asm/irq.h>
 33 #include <asm/traps.h>
 34 #include <asm/unaligned.h>
 35 #include <linux/atomic.h>
 36 #include <asm/smp.h>
 37 #include <asm/pdc.h>
 38 #include <asm/pdc_chassis.h>
 39 #include <asm/unwind.h>
 40 #include <asm/tlbflush.h>
 41 #include <asm/cacheflush.h>
 42 
 43 #include "../math-emu/math-emu.h"       /* for handle_fpe() */
 44 
 45 #define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
 46                           /*  dumped to the console via printk)          */
 47 
 48 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 49 DEFINE_SPINLOCK(pa_dbit_lock);
 50 #endif
 51 
 52 static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
 53         struct pt_regs *regs);
 54 
 55 static int printbinary(char *buf, unsigned long x, int nbits)
 56 {
 57         unsigned long mask = 1UL << (nbits - 1);
 58         while (mask != 0) {
 59                 *buf++ = (mask & x ? '1' : '');
 60                 mask >>= 1;
 61         }
 62         *buf = '\0';
 63 
 64         return nbits;
 65 }
 66 
 67 #ifdef CONFIG_64BIT
 68 #define RFMT "%016lx"
 69 #else
 70 #define RFMT "%08lx"
 71 #endif
 72 #define FFMT "%016llx"  /* fpregs are 64-bit always */
 73 
 74 #define PRINTREGS(lvl,r,f,fmt,x)        \
 75         printk("%s%s%02d-%02d  " fmt " " fmt " " fmt " " fmt "\n",      \
 76                 lvl, f, (x), (x+3), (r)[(x)+0], (r)[(x)+1],             \
 77                 (r)[(x)+2], (r)[(x)+3])
 78 
 79 static void print_gr(char *level, struct pt_regs *regs)
 80 {
 81         int i;
 82         char buf[64];
 83 
 84         printk("%s\n", level);
 85         printk("%s     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n", level);
 86         printbinary(buf, regs->gr[0], 32);
 87         printk("%sPSW: %s %s\n", level, buf, print_tainted());
 88 
 89         for (i = 0; i < 32; i += 4)
 90                 PRINTREGS(level, regs->gr, "r", RFMT, i);
 91 }
 92 
 93 static void print_fr(char *level, struct pt_regs *regs)
 94 {
 95         int i;
 96         char buf[64];
 97         struct { u32 sw[2]; } s;
 98 
 99         /* FR are 64bit everywhere. Need to use asm to get the content
100          * of fpsr/fper1, and we assume that we won't have a FP Identify
101          * in our way, otherwise we're screwed.
102          * The fldd is used to restore the T-bit if there was one, as the
103          * store clears it anyway.
104          * PA2.0 book says "thou shall not use fstw on FPSR/FPERs" - T-Bone */
105         asm volatile ("fstd %%fr0,0(%1) \n\t"
106                       "fldd 0(%1),%%fr0 \n\t"
107                       : "=m" (s) : "r" (&s) : "r0");
108 
109         printk("%s\n", level);
110         printk("%s      VZOUICununcqcqcqcqcqcrmunTDVZOUI\n", level);
111         printbinary(buf, s.sw[0], 32);
112         printk("%sFPSR: %s\n", level, buf);
113         printk("%sFPER1: %08x\n", level, s.sw[1]);
114 
115         /* here we'll print fr0 again, tho it'll be meaningless */
116         for (i = 0; i < 32; i += 4)
117                 PRINTREGS(level, regs->fr, "fr", FFMT, i);
118 }
119 
120 void show_regs(struct pt_regs *regs)
121 {
122         int i, user;
123         char *level;
124         unsigned long cr30, cr31;
125 
126         user = user_mode(regs);
127         level = user ? KERN_DEBUG : KERN_CRIT;
128 
129         show_regs_print_info(level);
130 
131         print_gr(level, regs);
132 
133         for (i = 0; i < 8; i += 4)
134                 PRINTREGS(level, regs->sr, "sr", RFMT, i);
135 
136         if (user)
137                 print_fr(level, regs);
138 
139         cr30 = mfctl(30);
140         cr31 = mfctl(31);
141         printk("%s\n", level);
142         printk("%sIASQ: " RFMT " " RFMT " IAOQ: " RFMT " " RFMT "\n",
143                level, regs->iasq[0], regs->iasq[1], regs->iaoq[0], regs->iaoq[1]);
144         printk("%s IIR: %08lx    ISR: " RFMT "  IOR: " RFMT "\n",
145                level, regs->iir, regs->isr, regs->ior);
146         printk("%s CPU: %8d   CR30: " RFMT " CR31: " RFMT "\n",
147                level, current_thread_info()->cpu, cr30, cr31);
148         printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
149 
150         if (user) {
151                 printk("%s IAOQ[0]: " RFMT "\n", level, regs->iaoq[0]);
152                 printk("%s IAOQ[1]: " RFMT "\n", level, regs->iaoq[1]);
153                 printk("%s RP(r2): " RFMT "\n", level, regs->gr[2]);
154         } else {
155                 printk("%s IAOQ[0]: %pS\n", level, (void *) regs->iaoq[0]);
156                 printk("%s IAOQ[1]: %pS\n", level, (void *) regs->iaoq[1]);
157                 printk("%s RP(r2): %pS\n", level, (void *) regs->gr[2]);
158 
159                 parisc_show_stack(current, NULL, regs);
160         }
161 }
162 
163 static void do_show_stack(struct unwind_frame_info *info)
164 {
165         int i = 1;
166 
167         printk(KERN_CRIT "Backtrace:\n");
168         while (i <= 16) {
169                 if (unwind_once(info) < 0 || info->ip == 0)
170                         break;
171 
172                 if (__kernel_text_address(info->ip)) {
173                         printk(KERN_CRIT " [<" RFMT ">] %pS\n",
174                                 info->ip, (void *) info->ip);
175                         i++;
176                 }
177         }
178         printk(KERN_CRIT "\n");
179 }
180 
181 static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
182         struct pt_regs *regs)
183 {
184         struct unwind_frame_info info;
185         struct task_struct *t;
186 
187         t = task ? task : current;
188         if (regs) {
189                 unwind_frame_init(&info, t, regs);
190                 goto show_stack;
191         }
192 
193         if (t == current) {
194                 unsigned long sp;
195 
196 HERE:
197                 asm volatile ("copy %%r30, %0" : "=r"(sp));
198                 {
199                         struct pt_regs r;
200 
201                         memset(&r, 0, sizeof(struct pt_regs));
202                         r.iaoq[0] = (unsigned long)&&HERE;
203                         r.gr[2] = (unsigned long)__builtin_return_address(0);
204                         r.gr[30] = sp;
205 
206                         unwind_frame_init(&info, current, &r);
207                 }
208         } else {
209                 unwind_frame_init_from_blocked_task(&info, t);
210         }
211 
212 show_stack:
213         do_show_stack(&info);
214 }
215 
216 void show_stack(struct task_struct *t, unsigned long *sp)
217 {
218         return parisc_show_stack(t, sp, NULL);
219 }
220 
221 int is_valid_bugaddr(unsigned long iaoq)
222 {
223         return 1;
224 }
225 
226 void die_if_kernel(char *str, struct pt_regs *regs, long err)
227 {
228         if (user_mode(regs)) {
229                 if (err == 0)
230                         return; /* STFU */
231 
232                 printk(KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
233                         current->comm, task_pid_nr(current), str, err, regs->iaoq[0]);
234 #ifdef PRINT_USER_FAULTS
235                 /* XXX for debugging only */
236                 show_regs(regs);
237 #endif
238                 return;
239         }
240 
241         oops_in_progress = 1;
242 
243         oops_enter();
244 
245         /* Amuse the user in a SPARC fashion */
246         if (err) printk(KERN_CRIT
247                         "      _______________________________ \n"
248                         "     < Your System ate a SPARC! Gah! >\n"
249                         "      ------------------------------- \n"
250                         "             \\   ^__^\n"
251                         "                 (__)\\       )\\/\\\n"
252                         "                  U  ||----w |\n"
253                         "                     ||     ||\n");
254         
255         /* unlock the pdc lock if necessary */
256         pdc_emergency_unlock();
257 
258         /* maybe the kernel hasn't booted very far yet and hasn't been able 
259          * to initialize the serial or STI console. In that case we should 
260          * re-enable the pdc console, so that the user will be able to 
261          * identify the problem. */
262         if (!console_drivers)
263                 pdc_console_restart();
264         
265         if (err)
266                 printk(KERN_CRIT "%s (pid %d): %s (code %ld)\n",
267                         current->comm, task_pid_nr(current), str, err);
268 
269         /* Wot's wrong wif bein' racy? */
270         if (current->thread.flags & PARISC_KERNEL_DEATH) {
271                 printk(KERN_CRIT "%s() recursion detected.\n", __func__);
272                 local_irq_enable();
273                 while (1);
274         }
275         current->thread.flags |= PARISC_KERNEL_DEATH;
276 
277         show_regs(regs);
278         dump_stack();
279         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
280 
281         if (in_interrupt())
282                 panic("Fatal exception in interrupt");
283 
284         if (panic_on_oops) {
285                 printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
286                 ssleep(5);
287                 panic("Fatal exception");
288         }
289 
290         oops_exit();
291         do_exit(SIGSEGV);
292 }
293 
294 /* gdb uses break 4,8 */
295 #define GDB_BREAK_INSN 0x10004
296 static void handle_gdb_break(struct pt_regs *regs, int wot)
297 {
298         struct siginfo si;
299 
300         si.si_signo = SIGTRAP;
301         si.si_errno = 0;
302         si.si_code = wot;
303         si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
304         force_sig_info(SIGTRAP, &si, current);
305 }
306 
307 static void handle_break(struct pt_regs *regs)
308 {
309         unsigned iir = regs->iir;
310 
311         if (unlikely(iir == PARISC_BUG_BREAK_INSN && !user_mode(regs))) {
312                 /* check if a BUG() or WARN() trapped here.  */
313                 enum bug_trap_type tt;
314                 tt = report_bug(regs->iaoq[0] & ~3, regs);
315                 if (tt == BUG_TRAP_TYPE_WARN) {
316                         regs->iaoq[0] += 4;
317                         regs->iaoq[1] += 4;
318                         return; /* return to next instruction when WARN_ON().  */
319                 }
320                 die_if_kernel("Unknown kernel breakpoint", regs,
321                         (tt == BUG_TRAP_TYPE_NONE) ? 9 : 0);
322         }
323 
324 #ifdef PRINT_USER_FAULTS
325         if (unlikely(iir != GDB_BREAK_INSN)) {
326                 printk(KERN_DEBUG "break %d,%d: pid=%d command='%s'\n",
327                         iir & 31, (iir>>13) & ((1<<13)-1),
328                         task_pid_nr(current), current->comm);
329                 show_regs(regs);
330         }
331 #endif
332 
333         /* send standard GDB signal */
334         handle_gdb_break(regs, TRAP_BRKPT);
335 }
336 
337 static void default_trap(int code, struct pt_regs *regs)
338 {
339         printk(KERN_ERR "Trap %d on CPU %d\n", code, smp_processor_id());
340         show_regs(regs);
341 }
342 
343 void (*cpu_lpmc) (int code, struct pt_regs *regs) __read_mostly = default_trap;
344 
345 
346 void transfer_pim_to_trap_frame(struct pt_regs *regs)
347 {
348     register int i;
349     extern unsigned int hpmc_pim_data[];
350     struct pdc_hpmc_pim_11 *pim_narrow;
351     struct pdc_hpmc_pim_20 *pim_wide;
352 
353     if (boot_cpu_data.cpu_type >= pcxu) {
354 
355         pim_wide = (struct pdc_hpmc_pim_20 *)hpmc_pim_data;
356 
357         /*
358          * Note: The following code will probably generate a
359          * bunch of truncation error warnings from the compiler.
360          * Could be handled with an ifdef, but perhaps there
361          * is a better way.
362          */
363 
364         regs->gr[0] = pim_wide->cr[22];
365 
366         for (i = 1; i < 32; i++)
367             regs->gr[i] = pim_wide->gr[i];
368 
369         for (i = 0; i < 32; i++)
370             regs->fr[i] = pim_wide->fr[i];
371 
372         for (i = 0; i < 8; i++)
373             regs->sr[i] = pim_wide->sr[i];
374 
375         regs->iasq[0] = pim_wide->cr[17];
376         regs->iasq[1] = pim_wide->iasq_back;
377         regs->iaoq[0] = pim_wide->cr[18];
378         regs->iaoq[1] = pim_wide->iaoq_back;
379 
380         regs->sar  = pim_wide->cr[11];
381         regs->iir  = pim_wide->cr[19];
382         regs->isr  = pim_wide->cr[20];
383         regs->ior  = pim_wide->cr[21];
384     }
385     else {
386         pim_narrow = (struct pdc_hpmc_pim_11 *)hpmc_pim_data;
387 
388         regs->gr[0] = pim_narrow->cr[22];
389 
390         for (i = 1; i < 32; i++)
391             regs->gr[i] = pim_narrow->gr[i];
392 
393         for (i = 0; i < 32; i++)
394             regs->fr[i] = pim_narrow->fr[i];
395 
396         for (i = 0; i < 8; i++)
397             regs->sr[i] = pim_narrow->sr[i];
398 
399         regs->iasq[0] = pim_narrow->cr[17];
400         regs->iasq[1] = pim_narrow->iasq_back;
401         regs->iaoq[0] = pim_narrow->cr[18];
402         regs->iaoq[1] = pim_narrow->iaoq_back;
403 
404         regs->sar  = pim_narrow->cr[11];
405         regs->iir  = pim_narrow->cr[19];
406         regs->isr  = pim_narrow->cr[20];
407         regs->ior  = pim_narrow->cr[21];
408     }
409 
410     /*
411      * The following fields only have meaning if we came through
412      * another path. So just zero them here.
413      */
414 
415     regs->ksp = 0;
416     regs->kpc = 0;
417     regs->orig_r28 = 0;
418 }
419 
420 
421 /*
422  * This routine is called as a last resort when everything else
423  * has gone clearly wrong. We get called for faults in kernel space,
424  * and HPMC's.
425  */
426 void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long offset)
427 {
428         static DEFINE_SPINLOCK(terminate_lock);
429 
430         oops_in_progress = 1;
431 
432         set_eiem(0);
433         local_irq_disable();
434         spin_lock(&terminate_lock);
435 
436         /* unlock the pdc lock if necessary */
437         pdc_emergency_unlock();
438 
439         /* restart pdc console if necessary */
440         if (!console_drivers)
441                 pdc_console_restart();
442 
443         /* Not all paths will gutter the processor... */
444         switch(code){
445 
446         case 1:
447                 transfer_pim_to_trap_frame(regs);
448                 break;
449 
450         default:
451                 /* Fall through */
452                 break;
453 
454         }
455             
456         {
457                 /* show_stack(NULL, (unsigned long *)regs->gr[30]); */
458                 struct unwind_frame_info info;
459                 unwind_frame_init(&info, current, regs);
460                 do_show_stack(&info);
461         }
462 
463         printk("\n");
464         printk(KERN_CRIT "%s: Code=%d regs=%p (Addr=" RFMT ")\n",
465                         msg, code, regs, offset);
466         show_regs(regs);
467 
468         spin_unlock(&terminate_lock);
469 
470         /* put soft power button back under hardware control;
471          * if the user had pressed it once at any time, the 
472          * system will shut down immediately right here. */
473         pdc_soft_power_button(0);
474         
475         /* Call kernel panic() so reboot timeouts work properly 
476          * FIXME: This function should be on the list of
477          * panic notifiers, and we should call panic
478          * directly from the location that we wish. 
479          * e.g. We should not call panic from
480          * parisc_terminate, but rather the oter way around.
481          * This hack works, prints the panic message twice,
482          * and it enables reboot timers!
483          */
484         panic(msg);
485 }
486 
487 void notrace handle_interruption(int code, struct pt_regs *regs)
488 {
489         unsigned long fault_address = 0;
490         unsigned long fault_space = 0;
491         struct siginfo si;
492 
493         if (code == 1)
494             pdc_console_restart();  /* switch back to pdc if HPMC */
495         else
496             local_irq_enable();
497 
498         /* Security check:
499          * If the priority level is still user, and the
500          * faulting space is not equal to the active space
501          * then the user is attempting something in a space
502          * that does not belong to them. Kill the process.
503          *
504          * This is normally the situation when the user
505          * attempts to jump into the kernel space at the
506          * wrong offset, be it at the gateway page or a
507          * random location.
508          *
509          * We cannot normally signal the process because it
510          * could *be* on the gateway page, and processes
511          * executing on the gateway page can't have signals
512          * delivered.
513          * 
514          * We merely readjust the address into the users
515          * space, at a destination address of zero, and
516          * allow processing to continue.
517          */
518         if (((unsigned long)regs->iaoq[0] & 3) &&
519             ((unsigned long)regs->iasq[0] != (unsigned long)regs->sr[7])) { 
520                 /* Kill the user process later */
521                 regs->iaoq[0] = 0 | 3;
522                 regs->iaoq[1] = regs->iaoq[0] + 4;
523                 regs->iasq[0] = regs->iasq[1] = regs->sr[7];
524                 regs->gr[0] &= ~PSW_B;
525                 return;
526         }
527         
528 #if 0
529         printk(KERN_CRIT "Interruption # %d\n", code);
530 #endif
531 
532         switch(code) {
533 
534         case  1:
535                 /* High-priority machine check (HPMC) */
536                 
537                 /* set up a new led state on systems shipped with a LED State panel */
538                 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_HPMC);
539 
540                 parisc_terminate("High Priority Machine Check (HPMC)",
541                                 regs, code, 0);
542                 /* NOT REACHED */
543                 
544         case  2:
545                 /* Power failure interrupt */
546                 printk(KERN_CRIT "Power failure interrupt !\n");
547                 return;
548 
549         case  3:
550                 /* Recovery counter trap */
551                 regs->gr[0] &= ~PSW_R;
552                 if (user_space(regs))
553                         handle_gdb_break(regs, TRAP_TRACE);
554                 /* else this must be the start of a syscall - just let it run */
555                 return;
556 
557         case  5:
558                 /* Low-priority machine check */
559                 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_LPMC);
560                 
561                 flush_cache_all();
562                 flush_tlb_all();
563                 cpu_lpmc(5, regs);
564                 return;
565 
566         case  6:
567                 /* Instruction TLB miss fault/Instruction page fault */
568                 fault_address = regs->iaoq[0];
569                 fault_space   = regs->iasq[0];
570                 break;
571 
572         case  8:
573                 /* Illegal instruction trap */
574                 die_if_kernel("Illegal instruction", regs, code);
575                 si.si_code = ILL_ILLOPC;
576                 goto give_sigill;
577 
578         case  9:
579                 /* Break instruction trap */
580                 handle_break(regs);
581                 return;
582 
583         case 10:
584                 /* Privileged operation trap */
585                 die_if_kernel("Privileged operation", regs, code);
586                 si.si_code = ILL_PRVOPC;
587                 goto give_sigill;
588 
589         case 11:
590                 /* Privileged register trap */
591                 if ((regs->iir & 0xffdfffe0) == 0x034008a0) {
592 
593                         /* This is a MFCTL cr26/cr27 to gr instruction.
594                          * PCXS traps on this, so we need to emulate it.
595                          */
596 
597                         if (regs->iir & 0x00200000)
598                                 regs->gr[regs->iir & 0x1f] = mfctl(27);
599                         else
600                                 regs->gr[regs->iir & 0x1f] = mfctl(26);
601 
602                         regs->iaoq[0] = regs->iaoq[1];
603                         regs->iaoq[1] += 4;
604                         regs->iasq[0] = regs->iasq[1];
605                         return;
606                 }
607 
608                 die_if_kernel("Privileged register usage", regs, code);
609                 si.si_code = ILL_PRVREG;
610         give_sigill:
611                 si.si_signo = SIGILL;
612                 si.si_errno = 0;
613                 si.si_addr = (void __user *) regs->iaoq[0];
614                 force_sig_info(SIGILL, &si, current);
615                 return;
616 
617         case 12:
618                 /* Overflow Trap, let the userland signal handler do the cleanup */
619                 si.si_signo = SIGFPE;
620                 si.si_code = FPE_INTOVF;
621                 si.si_addr = (void __user *) regs->iaoq[0];
622                 force_sig_info(SIGFPE, &si, current);
623                 return;
624                 
625         case 13:
626                 /* Conditional Trap
627                    The condition succeeds in an instruction which traps
628                    on condition  */
629                 if(user_mode(regs)){
630                         si.si_signo = SIGFPE;
631                         /* Set to zero, and let the userspace app figure it out from
632                            the insn pointed to by si_addr */
633                         si.si_code = 0;
634                         si.si_addr = (void __user *) regs->iaoq[0];
635                         force_sig_info(SIGFPE, &si, current);
636                         return;
637                 } 
638                 /* The kernel doesn't want to handle condition codes */
639                 break;
640                 
641         case 14:
642                 /* Assist Exception Trap, i.e. floating point exception. */
643                 die_if_kernel("Floating point exception", regs, 0); /* quiet */
644                 __inc_irq_stat(irq_fpassist_count);
645                 handle_fpe(regs);
646                 return;
647 
648         case 15:
649                 /* Data TLB miss fault/Data page fault */
650                 /* Fall through */
651         case 16:
652                 /* Non-access instruction TLB miss fault */
653                 /* The instruction TLB entry needed for the target address of the FIC
654                    is absent, and hardware can't find it, so we get to cleanup */
655                 /* Fall through */
656         case 17:
657                 /* Non-access data TLB miss fault/Non-access data page fault */
658                 /* FIXME: 
659                          Still need to add slow path emulation code here!
660                          If the insn used a non-shadow register, then the tlb
661                          handlers could not have their side-effect (e.g. probe
662                          writing to a target register) emulated since rfir would
663                          erase the changes to said register. Instead we have to
664                          setup everything, call this function we are in, and emulate
665                          by hand. Technically we need to emulate:
666                          fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw
667                 */
668                 fault_address = regs->ior;
669                 fault_space = regs->isr;
670                 break;
671 
672         case 18:
673                 /* PCXS only -- later cpu's split this into types 26,27 & 28 */
674                 /* Check for unaligned access */
675                 if (check_unaligned(regs)) {
676                         handle_unaligned(regs);
677                         return;
678                 }
679                 /* Fall Through */
680         case 26: 
681                 /* PCXL: Data memory access rights trap */
682                 fault_address = regs->ior;
683                 fault_space   = regs->isr;
684                 break;
685 
686         case 19:
687                 /* Data memory break trap */
688                 regs->gr[0] |= PSW_X; /* So we can single-step over the trap */
689                 /* fall thru */
690         case 21:
691                 /* Page reference trap */
692                 handle_gdb_break(regs, TRAP_HWBKPT);
693                 return;
694 
695         case 25:
696                 /* Taken branch trap */
697                 regs->gr[0] &= ~PSW_T;
698                 if (user_space(regs))
699                         handle_gdb_break(regs, TRAP_BRANCH);
700                 /* else this must be the start of a syscall - just let it
701                  * run.
702                  */
703                 return;
704 
705         case  7:  
706                 /* Instruction access rights */
707                 /* PCXL: Instruction memory protection trap */
708 
709                 /*
710                  * This could be caused by either: 1) a process attempting
711                  * to execute within a vma that does not have execute
712                  * permission, or 2) an access rights violation caused by a
713                  * flush only translation set up by ptep_get_and_clear().
714                  * So we check the vma permissions to differentiate the two.
715                  * If the vma indicates we have execute permission, then
716                  * the cause is the latter one. In this case, we need to
717                  * call do_page_fault() to fix the problem.
718                  */
719 
720                 if (user_mode(regs)) {
721                         struct vm_area_struct *vma;
722 
723                         down_read(&current->mm->mmap_sem);
724                         vma = find_vma(current->mm,regs->iaoq[0]);
725                         if (vma && (regs->iaoq[0] >= vma->vm_start)
726                                 && (vma->vm_flags & VM_EXEC)) {
727 
728                                 fault_address = regs->iaoq[0];
729                                 fault_space = regs->iasq[0];
730 
731                                 up_read(&current->mm->mmap_sem);
732                                 break; /* call do_page_fault() */
733                         }
734                         up_read(&current->mm->mmap_sem);
735                 }
736                 /* Fall Through */
737         case 27: 
738                 /* Data memory protection ID trap */
739                 if (code == 27 && !user_mode(regs) &&
740                         fixup_exception(regs))
741                         return;
742 
743                 die_if_kernel("Protection id trap", regs, code);
744                 si.si_code = SEGV_MAPERR;
745                 si.si_signo = SIGSEGV;
746                 si.si_errno = 0;
747                 if (code == 7)
748                     si.si_addr = (void __user *) regs->iaoq[0];
749                 else
750                     si.si_addr = (void __user *) regs->ior;
751                 force_sig_info(SIGSEGV, &si, current);
752                 return;
753 
754         case 28: 
755                 /* Unaligned data reference trap */
756                 handle_unaligned(regs);
757                 return;
758 
759         default:
760                 if (user_mode(regs)) {
761 #ifdef PRINT_USER_FAULTS
762                         printk(KERN_DEBUG "\nhandle_interruption() pid=%d command='%s'\n",
763                             task_pid_nr(current), current->comm);
764                         show_regs(regs);
765 #endif
766                         /* SIGBUS, for lack of a better one. */
767                         si.si_signo = SIGBUS;
768                         si.si_code = BUS_OBJERR;
769                         si.si_errno = 0;
770                         si.si_addr = (void __user *) regs->ior;
771                         force_sig_info(SIGBUS, &si, current);
772                         return;
773                 }
774                 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
775                 
776                 parisc_terminate("Unexpected interruption", regs, code, 0);
777                 /* NOT REACHED */
778         }
779 
780         if (user_mode(regs)) {
781             if ((fault_space >> SPACEID_SHIFT) != (regs->sr[7] >> SPACEID_SHIFT)) {
782 #ifdef PRINT_USER_FAULTS
783                 if (fault_space == 0)
784                         printk(KERN_DEBUG "User Fault on Kernel Space ");
785                 else
786                         printk(KERN_DEBUG "User Fault (long pointer) (fault %d) ",
787                                code);
788                 printk(KERN_CONT "pid=%d command='%s'\n",
789                        task_pid_nr(current), current->comm);
790                 show_regs(regs);
791 #endif
792                 si.si_signo = SIGSEGV;
793                 si.si_errno = 0;
794                 si.si_code = SEGV_MAPERR;
795                 si.si_addr = (void __user *) regs->ior;
796                 force_sig_info(SIGSEGV, &si, current);
797                 return;
798             }
799         }
800         else {
801 
802             /*
803              * The kernel should never fault on its own address space,
804              * unless pagefault_disable() was called before.
805              */
806 
807             if (fault_space == 0 && !in_atomic())
808             {
809                 /* Clean up and return if in exception table. */
810                 if (fixup_exception(regs))
811                         return;
812                 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
813                 parisc_terminate("Kernel Fault", regs, code, fault_address);
814             }
815         }
816 
817         do_page_fault(regs, code, fault_address);
818 }
819 
820 
821 int __init check_ivt(void *iva)
822 {
823         extern u32 os_hpmc_size;
824         extern const u32 os_hpmc[];
825 
826         int i;
827         u32 check = 0;
828         u32 *ivap;
829         u32 *hpmcp;
830         u32 length;
831 
832         if (strcmp((char *)iva, "cows can fly"))
833                 return -1;
834 
835         ivap = (u32 *)iva;
836 
837         for (i = 0; i < 8; i++)
838             *ivap++ = 0;
839 
840         /* Compute Checksum for HPMC handler */
841         length = os_hpmc_size;
842         ivap[7] = length;
843 
844         hpmcp = (u32 *)os_hpmc;
845 
846         for (i=0; i<length/4; i++)
847             check += *hpmcp++;
848 
849         for (i=0; i<8; i++)
850             check += ivap[i];
851 
852         ivap[5] = -check;
853 
854         return 0;
855 }
856         
857 #ifndef CONFIG_64BIT
858 extern const void fault_vector_11;
859 #endif
860 extern const void fault_vector_20;
861 
862 void __init trap_init(void)
863 {
864         void *iva;
865 
866         if (boot_cpu_data.cpu_type >= pcxu)
867                 iva = (void *) &fault_vector_20;
868         else
869 #ifdef CONFIG_64BIT
870                 panic("Can't boot 64-bit OS on PA1.1 processor!");
871 #else
872                 iva = (void *) &fault_vector_11;
873 #endif
874 
875         if (check_ivt(iva))
876                 panic("IVT invalid");
877 }
878 

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