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Linux/arch/powerpc/kernel/kgdb.c

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  1 /*
  2  * PowerPC backend to the KGDB stub.
  3  *
  4  * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
  5  * Copyright (C) 2003 Timesys Corporation.
  6  * Copyright (C) 2004-2006 MontaVista Software, Inc.
  7  * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
  8  * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
  9  * Sergei Shtylyov <sshtylyov@ru.mvista.com>
 10  * Copyright (C) 2007-2008 Wind River Systems, Inc.
 11  *
 12  * This file is licensed under the terms of the GNU General Public License
 13  * version 2. This program as licensed "as is" without any warranty of any
 14  * kind, whether express or implied.
 15  */
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/kgdb.h>
 19 #include <linux/smp.h>
 20 #include <linux/signal.h>
 21 #include <linux/ptrace.h>
 22 #include <linux/kdebug.h>
 23 #include <asm/current.h>
 24 #include <asm/processor.h>
 25 #include <asm/machdep.h>
 26 #include <asm/debug.h>
 27 #include <asm/code-patching.h>
 28 #include <linux/slab.h>
 29 
 30 /*
 31  * This table contains the mapping between PowerPC hardware trap types, and
 32  * signals, which are primarily what GDB understands.  GDB and the kernel
 33  * don't always agree on values, so we use constants taken from gdb-6.2.
 34  */
 35 static struct hard_trap_info
 36 {
 37         unsigned int tt;                /* Trap type code for powerpc */
 38         unsigned char signo;            /* Signal that we map this trap into */
 39 } hard_trap_info[] = {
 40         { 0x0100, 0x02 /* SIGINT */  },         /* system reset */
 41         { 0x0200, 0x0b /* SIGSEGV */ },         /* machine check */
 42         { 0x0300, 0x0b /* SIGSEGV */ },         /* data access */
 43         { 0x0400, 0x0b /* SIGSEGV */ },         /* instruction access */
 44         { 0x0500, 0x02 /* SIGINT */  },         /* external interrupt */
 45         { 0x0600, 0x0a /* SIGBUS */  },         /* alignment */
 46         { 0x0700, 0x05 /* SIGTRAP */ },         /* program check */
 47         { 0x0800, 0x08 /* SIGFPE */  },         /* fp unavailable */
 48         { 0x0900, 0x0e /* SIGALRM */ },         /* decrementer */
 49         { 0x0c00, 0x14 /* SIGCHLD */ },         /* system call */
 50 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
 51         { 0x2002, 0x05 /* SIGTRAP */ },         /* debug */
 52 #if defined(CONFIG_FSL_BOOKE)
 53         { 0x2010, 0x08 /* SIGFPE */  },         /* spe unavailable */
 54         { 0x2020, 0x08 /* SIGFPE */  },         /* spe unavailable */
 55         { 0x2030, 0x08 /* SIGFPE */  },         /* spe fp data */
 56         { 0x2040, 0x08 /* SIGFPE */  },         /* spe fp data */
 57         { 0x2050, 0x08 /* SIGFPE */  },         /* spe fp round */
 58         { 0x2060, 0x0e /* SIGILL */  },         /* performance monitor */
 59         { 0x2900, 0x08 /* SIGFPE */  },         /* apu unavailable */
 60         { 0x3100, 0x0e /* SIGALRM */ },         /* fixed interval timer */
 61         { 0x3200, 0x02 /* SIGINT */  },         /* watchdog */
 62 #else /* ! CONFIG_FSL_BOOKE */
 63         { 0x1000, 0x0e /* SIGALRM */ },         /* prog interval timer */
 64         { 0x1010, 0x0e /* SIGALRM */ },         /* fixed interval timer */
 65         { 0x1020, 0x02 /* SIGINT */  },         /* watchdog */
 66         { 0x2010, 0x08 /* SIGFPE */  },         /* fp unavailable */
 67         { 0x2020, 0x08 /* SIGFPE */  },         /* ap unavailable */
 68 #endif
 69 #else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */
 70         { 0x0d00, 0x05 /* SIGTRAP */ },         /* single-step */
 71 #if defined(CONFIG_PPC_8xx)
 72         { 0x1000, 0x04 /* SIGILL */  },         /* software emulation */
 73 #else /* ! CONFIG_PPC_8xx */
 74         { 0x0f00, 0x04 /* SIGILL */  },         /* performance monitor */
 75         { 0x0f20, 0x08 /* SIGFPE */  },         /* altivec unavailable */
 76         { 0x1300, 0x05 /* SIGTRAP */ },         /* instruction address break */
 77 #if defined(CONFIG_PPC64)
 78         { 0x1200, 0x05 /* SIGILL */  },         /* system error */
 79         { 0x1500, 0x04 /* SIGILL */  },         /* soft patch */
 80         { 0x1600, 0x04 /* SIGILL */  },         /* maintenance */
 81         { 0x1700, 0x08 /* SIGFPE */  },         /* altivec assist */
 82         { 0x1800, 0x04 /* SIGILL */  },         /* thermal */
 83 #else /* ! CONFIG_PPC64 */
 84         { 0x1400, 0x02 /* SIGINT */  },         /* SMI */
 85         { 0x1600, 0x08 /* SIGFPE */  },         /* altivec assist */
 86         { 0x1700, 0x04 /* SIGILL */  },         /* TAU */
 87         { 0x2000, 0x05 /* SIGTRAP */ },         /* run mode */
 88 #endif
 89 #endif
 90 #endif
 91         { 0x0000, 0x00 }                        /* Must be last */
 92 };
 93 
 94 static int computeSignal(unsigned int tt)
 95 {
 96         struct hard_trap_info *ht;
 97 
 98         for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
 99                 if (ht->tt == tt)
100                         return ht->signo;
101 
102         return SIGHUP;          /* default for things we don't know about */
103 }
104 
105 /**
106  *
107  *      kgdb_skipexception - Bail out of KGDB when we've been triggered.
108  *      @exception: Exception vector number
109  *      @regs: Current &struct pt_regs.
110  *
111  *      On some architectures we need to skip a breakpoint exception when
112  *      it occurs after a breakpoint has been removed.
113  *
114  */
115 int kgdb_skipexception(int exception, struct pt_regs *regs)
116 {
117         return kgdb_isremovedbreak(regs->nip);
118 }
119 
120 static int kgdb_debugger_ipi(struct pt_regs *regs)
121 {
122         kgdb_nmicallback(raw_smp_processor_id(), regs);
123         return 0;
124 }
125 
126 #ifdef CONFIG_SMP
127 void kgdb_roundup_cpus(void)
128 {
129         smp_send_debugger_break();
130 }
131 #endif
132 
133 /* KGDB functions to use existing PowerPC64 hooks. */
134 static int kgdb_debugger(struct pt_regs *regs)
135 {
136         return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
137                                       DIE_OOPS, regs);
138 }
139 
140 static int kgdb_handle_breakpoint(struct pt_regs *regs)
141 {
142         if (user_mode(regs))
143                 return 0;
144 
145         if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
146                 return 0;
147 
148         if (*(u32 *)regs->nip == BREAK_INSTR)
149                 regs->nip += BREAK_INSTR_SIZE;
150 
151         return 1;
152 }
153 
154 static int kgdb_singlestep(struct pt_regs *regs)
155 {
156         if (user_mode(regs))
157                 return 0;
158 
159         kgdb_handle_exception(0, SIGTRAP, 0, regs);
160 
161         return 1;
162 }
163 
164 static int kgdb_iabr_match(struct pt_regs *regs)
165 {
166         if (user_mode(regs))
167                 return 0;
168 
169         if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
170                 return 0;
171         return 1;
172 }
173 
174 static int kgdb_break_match(struct pt_regs *regs)
175 {
176         if (user_mode(regs))
177                 return 0;
178 
179         if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
180                 return 0;
181         return 1;
182 }
183 
184 #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)
185 
186 #define PACK32(ptr, src) do {          \
187         u32 *ptr32;                   \
188         ptr32 = (u32 *)ptr;           \
189         *(ptr32++) = (src);           \
190         ptr = (unsigned long *)ptr32; \
191         } while (0)
192 
193 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
194 {
195         struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
196                                                   STACK_FRAME_OVERHEAD);
197         unsigned long *ptr = gdb_regs;
198         int reg;
199 
200         memset(gdb_regs, 0, NUMREGBYTES);
201 
202         /* Regs GPR0-2 */
203         for (reg = 0; reg < 3; reg++)
204                 PACK64(ptr, regs->gpr[reg]);
205 
206         /* Regs GPR3-13 are caller saved, not in regs->gpr[] */
207         ptr += 11;
208 
209         /* Regs GPR14-31 */
210         for (reg = 14; reg < 32; reg++)
211                 PACK64(ptr, regs->gpr[reg]);
212 
213 #ifdef CONFIG_FSL_BOOKE
214 #ifdef CONFIG_SPE
215         for (reg = 0; reg < 32; reg++)
216                 PACK64(ptr, p->thread.evr[reg]);
217 #else
218         ptr += 32;
219 #endif
220 #else
221         /* fp registers not used by kernel, leave zero */
222         ptr += 32 * 8 / sizeof(long);
223 #endif
224 
225         PACK64(ptr, regs->nip);
226         PACK64(ptr, regs->msr);
227         PACK32(ptr, regs->ccr);
228         PACK64(ptr, regs->link);
229         PACK64(ptr, regs->ctr);
230         PACK32(ptr, regs->xer);
231 
232         BUG_ON((unsigned long)ptr >
233                (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
234 }
235 
236 #define GDB_SIZEOF_REG sizeof(unsigned long)
237 #define GDB_SIZEOF_REG_U32 sizeof(u32)
238 
239 #ifdef CONFIG_FSL_BOOKE
240 #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
241 #else
242 #define GDB_SIZEOF_FLOAT_REG sizeof(u64)
243 #endif
244 
245 struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
246 {
247         { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
248         { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
249         { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
250         { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
251         { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
252         { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
253         { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
254         { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
255         { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
256         { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
257         { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
258         { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
259         { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
260         { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
261         { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
262         { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
263         { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
264         { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
265         { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
266         { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
267         { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
268         { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
269         { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
270         { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
271         { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
272         { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
273         { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
274         { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
275         { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
276         { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
277         { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
278         { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
279 
280         { "f0", GDB_SIZEOF_FLOAT_REG, 0 },
281         { "f1", GDB_SIZEOF_FLOAT_REG, 1 },
282         { "f2", GDB_SIZEOF_FLOAT_REG, 2 },
283         { "f3", GDB_SIZEOF_FLOAT_REG, 3 },
284         { "f4", GDB_SIZEOF_FLOAT_REG, 4 },
285         { "f5", GDB_SIZEOF_FLOAT_REG, 5 },
286         { "f6", GDB_SIZEOF_FLOAT_REG, 6 },
287         { "f7", GDB_SIZEOF_FLOAT_REG, 7 },
288         { "f8", GDB_SIZEOF_FLOAT_REG, 8 },
289         { "f9", GDB_SIZEOF_FLOAT_REG, 9 },
290         { "f10", GDB_SIZEOF_FLOAT_REG, 10 },
291         { "f11", GDB_SIZEOF_FLOAT_REG, 11 },
292         { "f12", GDB_SIZEOF_FLOAT_REG, 12 },
293         { "f13", GDB_SIZEOF_FLOAT_REG, 13 },
294         { "f14", GDB_SIZEOF_FLOAT_REG, 14 },
295         { "f15", GDB_SIZEOF_FLOAT_REG, 15 },
296         { "f16", GDB_SIZEOF_FLOAT_REG, 16 },
297         { "f17", GDB_SIZEOF_FLOAT_REG, 17 },
298         { "f18", GDB_SIZEOF_FLOAT_REG, 18 },
299         { "f19", GDB_SIZEOF_FLOAT_REG, 19 },
300         { "f20", GDB_SIZEOF_FLOAT_REG, 20 },
301         { "f21", GDB_SIZEOF_FLOAT_REG, 21 },
302         { "f22", GDB_SIZEOF_FLOAT_REG, 22 },
303         { "f23", GDB_SIZEOF_FLOAT_REG, 23 },
304         { "f24", GDB_SIZEOF_FLOAT_REG, 24 },
305         { "f25", GDB_SIZEOF_FLOAT_REG, 25 },
306         { "f26", GDB_SIZEOF_FLOAT_REG, 26 },
307         { "f27", GDB_SIZEOF_FLOAT_REG, 27 },
308         { "f28", GDB_SIZEOF_FLOAT_REG, 28 },
309         { "f29", GDB_SIZEOF_FLOAT_REG, 29 },
310         { "f30", GDB_SIZEOF_FLOAT_REG, 30 },
311         { "f31", GDB_SIZEOF_FLOAT_REG, 31 },
312 
313         { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
314         { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
315         { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
316         { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
317         { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
318         { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
319 };
320 
321 char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
322 {
323         if (regno >= DBG_MAX_REG_NUM || regno < 0)
324                 return NULL;
325 
326         if (regno < 32 || regno >= 64)
327                 /* First 0 -> 31 gpr registers*/
328                 /* pc, msr, ls... registers 64 -> 69 */
329                 memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
330                                 dbg_reg_def[regno].size);
331 
332         if (regno >= 32 && regno < 64) {
333                 /* FP registers 32 -> 63 */
334 #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
335                 if (current)
336                         memcpy(mem, &current->thread.evr[regno-32],
337                                         dbg_reg_def[regno].size);
338 #else
339                 /* fp registers not used by kernel, leave zero */
340                 memset(mem, 0, dbg_reg_def[regno].size);
341 #endif
342         }
343 
344         return dbg_reg_def[regno].name;
345 }
346 
347 int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
348 {
349         if (regno >= DBG_MAX_REG_NUM || regno < 0)
350                 return -EINVAL;
351 
352         if (regno < 32 || regno >= 64)
353                 /* First 0 -> 31 gpr registers*/
354                 /* pc, msr, ls... registers 64 -> 69 */
355                 memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
356                                 dbg_reg_def[regno].size);
357 
358         if (regno >= 32 && regno < 64) {
359                 /* FP registers 32 -> 63 */
360 #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
361                 memcpy(&current->thread.evr[regno-32], mem,
362                                 dbg_reg_def[regno].size);
363 #else
364                 /* fp registers not used by kernel, leave zero */
365                 return 0;
366 #endif
367         }
368 
369         return 0;
370 }
371 
372 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
373 {
374         regs->nip = pc;
375 }
376 
377 /*
378  * This function does PowerPC specific procesing for interfacing to gdb.
379  */
380 int kgdb_arch_handle_exception(int vector, int signo, int err_code,
381                                char *remcom_in_buffer, char *remcom_out_buffer,
382                                struct pt_regs *linux_regs)
383 {
384         char *ptr = &remcom_in_buffer[1];
385         unsigned long addr;
386 
387         switch (remcom_in_buffer[0]) {
388                 /*
389                  * sAA..AA   Step one instruction from AA..AA
390                  * This will return an error to gdb ..
391                  */
392         case 's':
393         case 'c':
394                 /* handle the optional parameter */
395                 if (kgdb_hex2long(&ptr, &addr))
396                         linux_regs->nip = addr;
397 
398                 atomic_set(&kgdb_cpu_doing_single_step, -1);
399                 /* set the trace bit if we're stepping */
400                 if (remcom_in_buffer[0] == 's') {
401 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
402                         mtspr(SPRN_DBCR0,
403                               mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
404                         linux_regs->msr |= MSR_DE;
405 #else
406                         linux_regs->msr |= MSR_SE;
407 #endif
408                         atomic_set(&kgdb_cpu_doing_single_step,
409                                    raw_smp_processor_id());
410                 }
411                 return 0;
412         }
413 
414         return -1;
415 }
416 
417 int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
418 {
419         int err;
420         unsigned int instr;
421         unsigned int *addr = (unsigned int *)bpt->bpt_addr;
422 
423         err = probe_kernel_address(addr, instr);
424         if (err)
425                 return err;
426 
427         err = patch_instruction(addr, BREAK_INSTR);
428         if (err)
429                 return -EFAULT;
430 
431         *(unsigned int *)bpt->saved_instr = instr;
432 
433         return 0;
434 }
435 
436 int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
437 {
438         int err;
439         unsigned int instr = *(unsigned int *)bpt->saved_instr;
440         unsigned int *addr = (unsigned int *)bpt->bpt_addr;
441 
442         err = patch_instruction(addr, instr);
443         if (err)
444                 return -EFAULT;
445 
446         return 0;
447 }
448 
449 /*
450  * Global data
451  */
452 const struct kgdb_arch arch_kgdb_ops;
453 
454 static int kgdb_not_implemented(struct pt_regs *regs)
455 {
456         return 0;
457 }
458 
459 static void *old__debugger_ipi;
460 static void *old__debugger;
461 static void *old__debugger_bpt;
462 static void *old__debugger_sstep;
463 static void *old__debugger_iabr_match;
464 static void *old__debugger_break_match;
465 static void *old__debugger_fault_handler;
466 
467 int kgdb_arch_init(void)
468 {
469         old__debugger_ipi = __debugger_ipi;
470         old__debugger = __debugger;
471         old__debugger_bpt = __debugger_bpt;
472         old__debugger_sstep = __debugger_sstep;
473         old__debugger_iabr_match = __debugger_iabr_match;
474         old__debugger_break_match = __debugger_break_match;
475         old__debugger_fault_handler = __debugger_fault_handler;
476 
477         __debugger_ipi = kgdb_debugger_ipi;
478         __debugger = kgdb_debugger;
479         __debugger_bpt = kgdb_handle_breakpoint;
480         __debugger_sstep = kgdb_singlestep;
481         __debugger_iabr_match = kgdb_iabr_match;
482         __debugger_break_match = kgdb_break_match;
483         __debugger_fault_handler = kgdb_not_implemented;
484 
485         return 0;
486 }
487 
488 void kgdb_arch_exit(void)
489 {
490         __debugger_ipi = old__debugger_ipi;
491         __debugger = old__debugger;
492         __debugger_bpt = old__debugger_bpt;
493         __debugger_sstep = old__debugger_sstep;
494         __debugger_iabr_match = old__debugger_iabr_match;
495         __debugger_break_match = old__debugger_break_match;
496         __debugger_fault_handler = old__debugger_fault_handler;
497 }
498 

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