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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [i386-darwin-nat.c] - Blame information for rev 842

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1 227 jeremybenn
/* Darwin support for GDB, the GNU debugger.
2
   Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2008, 2009, 2010
3
   Free Software Foundation, Inc.
4
 
5
   Contributed by Apple Computer, Inc.
6
 
7
   This file is part of GDB.
8
 
9
   This program is free software; you can redistribute it and/or modify
10
   it under the terms of the GNU General Public License as published by
11
   the Free Software Foundation; either version 3 of the License, or
12
   (at your option) any later version.
13
 
14
   This program is distributed in the hope that it will be useful,
15
   but WITHOUT ANY WARRANTY; without even the implied warranty of
16
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17
   GNU General Public License for more details.
18
 
19
   You should have received a copy of the GNU General Public License
20
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
21
 
22
#include "defs.h"
23
#include "frame.h"
24
#include "inferior.h"
25
#include "target.h"
26
#include "symfile.h"
27
#include "symtab.h"
28
#include "objfiles.h"
29
#include "gdbcmd.h"
30
#include "regcache.h"
31
#include "gdb_assert.h"
32
#include "i386-tdep.h"
33
#include "i387-tdep.h"
34
#include "gdbarch.h"
35
#include "arch-utils.h"
36
#include "gdbcore.h"
37
 
38
#include "darwin-nat.h"
39
#include "i386-darwin-tdep.h"
40
 
41
#ifdef BFD64
42
#include "amd64-nat.h"
43
#include "amd64-tdep.h"
44
#include "amd64-darwin-tdep.h"
45
#endif
46
 
47
/* Read register values from the inferior process.
48
   If REGNO is -1, do this for all registers.
49
   Otherwise, REGNO specifies which register (so we can save time).  */
50
static void
51
i386_darwin_fetch_inferior_registers (struct target_ops *ops,
52
                                      struct regcache *regcache, int regno)
53
{
54
  thread_t current_thread = ptid_get_tid (inferior_ptid);
55
  int fetched = 0;
56
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
57
 
58
#ifdef BFD64
59
  if (gdbarch_ptr_bit (gdbarch) == 64)
60
    {
61
      if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
62
        {
63
          x86_thread_state_t gp_regs;
64
          unsigned int gp_count = x86_THREAD_STATE_COUNT;
65
          kern_return_t ret;
66
 
67
          ret = thread_get_state
68
            (current_thread, x86_THREAD_STATE, (thread_state_t) & gp_regs,
69
             &gp_count);
70
          if (ret != KERN_SUCCESS)
71
            {
72
              printf_unfiltered (_("Error calling thread_get_state for GP registers for thread 0x%ulx"), current_thread);
73
              MACH_CHECK_ERROR (ret);
74
            }
75
          amd64_supply_native_gregset (regcache, &gp_regs.uts, -1);
76
          fetched++;
77
        }
78
 
79
      if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
80
        {
81
          x86_float_state_t fp_regs;
82
          unsigned int fp_count = x86_FLOAT_STATE_COUNT;
83
          kern_return_t ret;
84
 
85
          ret = thread_get_state
86
            (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
87
             &fp_count);
88
          if (ret != KERN_SUCCESS)
89
            {
90
              printf_unfiltered (_("Error calling thread_get_state for float registers for thread 0x%ulx"), current_thread);
91
              MACH_CHECK_ERROR (ret);
92
            }
93
          amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw);
94
          fetched++;
95
        }
96
    }
97
  else
98
#endif
99
    {
100
      if (regno == -1 || regno < I386_NUM_GREGS)
101
        {
102
          i386_thread_state_t gp_regs;
103
          unsigned int gp_count = i386_THREAD_STATE_COUNT;
104
          kern_return_t ret;
105
          int i;
106
 
107
          ret = thread_get_state
108
            (current_thread, i386_THREAD_STATE, (thread_state_t) & gp_regs,
109
             &gp_count);
110
          if (ret != KERN_SUCCESS)
111
            {
112
              printf_unfiltered (_("Error calling thread_get_state for GP registers for thread 0x%ulx"), current_thread);
113
              MACH_CHECK_ERROR (ret);
114
            }
115
          for (i = 0; i < I386_NUM_GREGS; i++)
116
            regcache_raw_supply
117
              (regcache, i,
118
               (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
119
 
120
          fetched++;
121
        }
122
 
123
      if (regno == -1
124
          || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
125
        {
126
          i386_float_state_t fp_regs;
127
          unsigned int fp_count = i386_FLOAT_STATE_COUNT;
128
          kern_return_t ret;
129
 
130
          ret = thread_get_state
131
            (current_thread, i386_FLOAT_STATE, (thread_state_t) & fp_regs,
132
             &fp_count);
133
          if (ret != KERN_SUCCESS)
134
            {
135
              printf_unfiltered (_("Error calling thread_get_state for float registers for thread 0x%ulx"), current_thread);
136
              MACH_CHECK_ERROR (ret);
137
            }
138
          i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw);
139
          fetched++;
140
        }
141
    }
142
 
143
  if (! fetched)
144
    {
145
      warning (_("unknown register %d"), regno);
146
      regcache_raw_supply (regcache, regno, NULL);
147
    }
148
}
149
 
150
/* Store our register values back into the inferior.
151
   If REGNO is -1, do this for all registers.
152
   Otherwise, REGNO specifies which register (so we can save time).  */
153
 
154
static void
155
i386_darwin_store_inferior_registers (struct target_ops *ops,
156
                                      struct regcache *regcache, int regno)
157
{
158
  thread_t current_thread = ptid_get_tid (inferior_ptid);
159
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
160
 
161
#ifdef BFD64
162
  if (gdbarch_ptr_bit (gdbarch) == 64)
163
    {
164
      if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
165
        {
166
          x86_thread_state_t gp_regs;
167
          kern_return_t ret;
168
          unsigned int gp_count = x86_THREAD_STATE_COUNT;
169
 
170
          ret = thread_get_state
171
            (current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs,
172
             &gp_count);
173
          MACH_CHECK_ERROR (ret);
174
          gdb_assert (gp_regs.tsh.flavor == x86_THREAD_STATE64);
175
          gdb_assert (gp_regs.tsh.count == x86_THREAD_STATE64_COUNT);
176
 
177
          amd64_collect_native_gregset (regcache, &gp_regs.uts, regno);
178
 
179
          ret = thread_set_state (current_thread, x86_THREAD_STATE,
180
                                  (thread_state_t) &gp_regs,
181
                                  x86_THREAD_STATE_COUNT);
182
          MACH_CHECK_ERROR (ret);
183
        }
184
 
185
      if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
186
        {
187
          x86_float_state_t fp_regs;
188
          kern_return_t ret;
189
          unsigned int fp_count = x86_FLOAT_STATE_COUNT;
190
 
191
          ret = thread_get_state
192
            (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
193
             &fp_count);
194
          MACH_CHECK_ERROR (ret);
195
          gdb_assert (fp_regs.fsh.flavor == x86_FLOAT_STATE64);
196
          gdb_assert (fp_regs.fsh.count == x86_FLOAT_STATE64_COUNT);
197
 
198
          amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw);
199
 
200
          ret = thread_set_state (current_thread, x86_FLOAT_STATE,
201
                                  (thread_state_t) & fp_regs,
202
                                  x86_FLOAT_STATE_COUNT);
203
          MACH_CHECK_ERROR (ret);
204
        }
205
    }
206
  else
207
#endif
208
    {
209
      if (regno == -1 || regno < I386_NUM_GREGS)
210
        {
211
          i386_thread_state_t gp_regs;
212
          kern_return_t ret;
213
          unsigned int gp_count = i386_THREAD_STATE_COUNT;
214
          int i;
215
 
216
          ret = thread_get_state
217
            (current_thread, i386_THREAD_STATE, (thread_state_t) & gp_regs,
218
             &gp_count);
219
          MACH_CHECK_ERROR (ret);
220
 
221
          for (i = 0; i < I386_NUM_GREGS; i++)
222
            if (regno == -1 || regno == i)
223
              regcache_raw_collect
224
                (regcache, i,
225
                 (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
226
 
227
          ret = thread_set_state (current_thread, i386_THREAD_STATE,
228
                                  (thread_state_t) & gp_regs,
229
                                  i386_THREAD_STATE_COUNT);
230
          MACH_CHECK_ERROR (ret);
231
        }
232
 
233
      if (regno == -1
234
          || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
235
        {
236
          i386_float_state_t fp_regs;
237
          unsigned int fp_count = i386_FLOAT_STATE_COUNT;
238
          kern_return_t ret;
239
 
240
          ret = thread_get_state
241
            (current_thread, i386_FLOAT_STATE, (thread_state_t) & fp_regs,
242
             &fp_count);
243
          MACH_CHECK_ERROR (ret);
244
 
245
          i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw);
246
 
247
          ret = thread_set_state (current_thread, i386_FLOAT_STATE,
248
                                  (thread_state_t) & fp_regs,
249
                                  i386_FLOAT_STATE_COUNT);
250
          MACH_CHECK_ERROR (ret);
251
        }
252
    }
253
}
254
 
255
 
256
/* Support for debug registers, boosted mostly from i386-linux-nat.c.  */
257
 
258
#ifndef DR_FIRSTADDR
259
#define DR_FIRSTADDR 0
260
#endif
261
 
262
#ifndef DR_LASTADDR
263
#define DR_LASTADDR 3
264
#endif
265
 
266
#ifndef DR_STATUS
267
#define DR_STATUS 6
268
#endif
269
 
270
#ifndef DR_CONTROL
271
#define DR_CONTROL 7
272
#endif
273
 
274
 
275
static void
276
i386_darwin_dr_set (int regnum, uint32_t value)
277
{
278
  int current_pid;
279
  thread_t current_thread;
280
  x86_debug_state_t dr_regs;
281
  kern_return_t ret;
282
  unsigned int dr_count = x86_DEBUG_STATE_COUNT;
283
 
284
  gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
285
 
286
  current_thread = ptid_get_tid (inferior_ptid);
287
 
288
  dr_regs.dsh.flavor = x86_DEBUG_STATE32;
289
  dr_regs.dsh.count = x86_DEBUG_STATE32_COUNT;
290
  dr_count = x86_DEBUG_STATE_COUNT;
291
  ret = thread_get_state (current_thread, x86_DEBUG_STATE,
292
                          (thread_state_t) &dr_regs, &dr_count);
293
 
294
  if (ret != KERN_SUCCESS)
295
    {
296
      printf_unfiltered (_("Error reading debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
297
      MACH_CHECK_ERROR (ret);
298
    }
299
 
300
  switch (regnum)
301
    {
302
      case 0:
303
        dr_regs.uds.ds32.__dr0 = value;
304
        break;
305
      case 1:
306
        dr_regs.uds.ds32.__dr1 = value;
307
        break;
308
      case 2:
309
        dr_regs.uds.ds32.__dr2 = value;
310
        break;
311
      case 3:
312
        dr_regs.uds.ds32.__dr3 = value;
313
        break;
314
      case 4:
315
        dr_regs.uds.ds32.__dr4 = value;
316
        break;
317
      case 5:
318
        dr_regs.uds.ds32.__dr5 = value;
319
        break;
320
      case 6:
321
        dr_regs.uds.ds32.__dr6 = value;
322
        break;
323
      case 7:
324
        dr_regs.uds.ds32.__dr7 = value;
325
        break;
326
    }
327
 
328
  ret = thread_set_state (current_thread, x86_DEBUG_STATE,
329
                          (thread_state_t) &dr_regs, dr_count);
330
 
331
  if (ret != KERN_SUCCESS)
332
    {
333
      printf_unfiltered (_("Error writing debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
334
      MACH_CHECK_ERROR (ret);
335
    }
336
}
337
 
338
static uint32_t
339
i386_darwin_dr_get (int regnum)
340
{
341
  thread_t current_thread;
342
  x86_debug_state_t dr_regs;
343
  kern_return_t ret;
344
  unsigned int dr_count = x86_DEBUG_STATE_COUNT;
345
 
346
  gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
347
 
348
  current_thread = ptid_get_tid (inferior_ptid);
349
 
350
  dr_regs.dsh.flavor = x86_DEBUG_STATE32;
351
  dr_regs.dsh.count = x86_DEBUG_STATE32_COUNT;
352
  dr_count = x86_DEBUG_STATE_COUNT;
353
  ret = thread_get_state (current_thread, x86_DEBUG_STATE,
354
                          (thread_state_t) &dr_regs, &dr_count);
355
 
356
  if (ret != KERN_SUCCESS)
357
    {
358
      printf_unfiltered (_("Error reading debug registers thread 0x%x via thread_get_state\n"), (int) current_thread);
359
      MACH_CHECK_ERROR (ret);
360
    }
361
 
362
  switch (regnum)
363
    {
364
      case 0:
365
        return dr_regs.uds.ds32.__dr0;
366
      case 1:
367
        return dr_regs.uds.ds32.__dr1;
368
      case 2:
369
        return dr_regs.uds.ds32.__dr2;
370
      case 3:
371
        return dr_regs.uds.ds32.__dr3;
372
      case 4:
373
        return dr_regs.uds.ds32.__dr4;
374
      case 5:
375
        return dr_regs.uds.ds32.__dr5;
376
      case 6:
377
        return dr_regs.uds.ds32.__dr6;
378
      case 7:
379
        return dr_regs.uds.ds32.__dr7;
380
      default:
381
        return -1;
382
    }
383
}
384
 
385
void
386
i386_darwin_dr_set_control (unsigned long control)
387
{
388
  i386_darwin_dr_set (DR_CONTROL, control);
389
}
390
 
391
void
392
i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
393
{
394
  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
395
 
396
  i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
397
}
398
 
399
void
400
i386_darwin_dr_reset_addr (int regnum)
401
{
402
  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
403
 
404
  i386_darwin_dr_set (DR_FIRSTADDR + regnum, 0L);
405
}
406
 
407
unsigned long
408
i386_darwin_dr_get_status (void)
409
{
410
  return i386_darwin_dr_get (DR_STATUS);
411
}
412
 
413
void
414
darwin_check_osabi (darwin_inferior *inf, thread_t thread)
415
{
416
  if (gdbarch_osabi (target_gdbarch) == GDB_OSABI_UNKNOWN)
417
    {
418
      /* Attaching to a process.  Let's figure out what kind it is.  */
419
      x86_thread_state_t gp_regs;
420
      struct gdbarch_info info;
421
      unsigned int gp_count = x86_THREAD_STATE_COUNT;
422
      kern_return_t ret;
423
 
424
      ret = thread_get_state (thread, x86_THREAD_STATE,
425
                              (thread_state_t) &gp_regs, &gp_count);
426
      if (ret != KERN_SUCCESS)
427
        {
428
          MACH_CHECK_ERROR (ret);
429
          return;
430
        }
431
 
432
      gdbarch_info_init (&info);
433
      gdbarch_info_fill (&info);
434
      info.byte_order = gdbarch_byte_order (target_gdbarch);
435
      info.osabi = GDB_OSABI_DARWIN;
436
      if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
437
        info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
438
                                              bfd_mach_x86_64);
439
      else
440
        info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
441
                                              bfd_mach_i386_i386);
442
      gdbarch_update_p (info);
443
    }
444
}
445
 
446
#define X86_EFLAGS_T 0x100UL
447
 
448
/* Returning from a signal trampoline is done by calling a
449
   special system call (sigreturn).  This system call
450
   restores the registers that were saved when the signal was
451
   raised, including %eflags/%rflags.  That means that single-stepping
452
   won't work.  Instead, we'll have to modify the signal context
453
   that's about to be restored, and set the trace flag there.  */
454
 
455
static int
456
i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
457
{
458
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
459
  static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
460
  gdb_byte buf[sizeof (darwin_syscall)];
461
 
462
  /* Check if PC is at a sigreturn system call.  */
463
  if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
464
      && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
465
      && regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
466
    {
467
      ULONGEST uctx_addr;
468
      ULONGEST mctx_addr;
469
      ULONGEST flags_addr;
470
      unsigned int eflags;
471
 
472
      uctx_addr = read_memory_unsigned_integer
473
                    (regs->uts.ts32.__esp + 4, 4, byte_order);
474
      mctx_addr = read_memory_unsigned_integer
475
                    (uctx_addr + 28, 4, byte_order);
476
 
477
      flags_addr = mctx_addr + 12 + 9 * 4;
478
      read_memory (flags_addr, (gdb_byte *) &eflags, 4);
479
      eflags |= X86_EFLAGS_T;
480
      write_memory (flags_addr, (gdb_byte *) &eflags, 4);
481
 
482
      return 1;
483
    }
484
  return 0;
485
}
486
 
487
#ifdef BFD64
488
static int
489
amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
490
{
491
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
492
  static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
493
  gdb_byte buf[sizeof (darwin_syscall)];
494
 
495
  /* Check if PC is at a sigreturn system call.  */
496
  if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
497
      && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
498
      && (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
499
    {
500
      ULONGEST mctx_addr;
501
      ULONGEST flags_addr;
502
      unsigned int rflags;
503
 
504
      mctx_addr = read_memory_unsigned_integer
505
                    (regs->uts.ts64.__rdi + 48, 8, byte_order);
506
      flags_addr = mctx_addr + 16 + 17 * 8;
507
 
508
      /* AMD64 is little endian.  */
509
      read_memory (flags_addr, (gdb_byte *) &rflags, 4);
510
      rflags |= X86_EFLAGS_T;
511
      write_memory (flags_addr, (gdb_byte *) &rflags, 4);
512
 
513
      return 1;
514
    }
515
  return 0;
516
}
517
#endif
518
 
519
void
520
darwin_set_sstep (thread_t thread, int enable)
521
{
522
  x86_thread_state_t regs;
523
  unsigned int count = x86_THREAD_STATE_COUNT;
524
  kern_return_t kret;
525
 
526
  kret = thread_get_state (thread, x86_THREAD_STATE,
527
                           (thread_state_t) &regs, &count);
528
  if (kret != KERN_SUCCESS)
529
    {
530
      printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
531
                         kret, thread);
532
      return;
533
    }
534
 
535
  switch (regs.tsh.flavor)
536
    {
537
    case x86_THREAD_STATE32:
538
      {
539
        __uint32_t bit = enable ? X86_EFLAGS_T : 0;
540
 
541
        if (enable && i386_darwin_sstep_at_sigreturn (&regs))
542
          return;
543
        if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit)
544
          return;
545
        regs.uts.ts32.__eflags = (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) | bit;
546
        kret = thread_set_state (thread, x86_THREAD_STATE,
547
                                 (thread_state_t) &regs, count);
548
        MACH_CHECK_ERROR (kret);
549
      }
550
      break;
551
#ifdef BFD64
552
    case x86_THREAD_STATE64:
553
      {
554
        __uint64_t bit = enable ? X86_EFLAGS_T : 0;
555
 
556
        if (enable && amd64_darwin_sstep_at_sigreturn (&regs))
557
          return;
558
        if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit)
559
          return;
560
        regs.uts.ts64.__rflags = (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) | bit;
561
        kret = thread_set_state (thread, x86_THREAD_STATE,
562
                                 (thread_state_t) &regs, count);
563
        MACH_CHECK_ERROR (kret);
564
      }
565
      break;
566
#endif
567
    default:
568
      error (_("darwin_set_sstep: unknown flavour: %d\n"), regs.tsh.flavor);
569
    }
570
}
571
 
572
void
573
darwin_complete_target (struct target_ops *target)
574
{
575
#ifdef BFD64
576
  amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
577
  amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs;
578
  amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset;
579
  amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs;
580
#endif
581
 
582
  target->to_fetch_registers = i386_darwin_fetch_inferior_registers;
583
  target->to_store_registers = i386_darwin_store_inferior_registers;
584
}

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