1 /* Darwin support for GDB, the GNU debugger.
2 Copyright 1997-2002, 2008-2012 Free Software Foundation, Inc.
4 Contributed by Apple Computer, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
30 #include "gdb_assert.h"
31 #include "i386-tdep.h"
32 #include "i387-tdep.h"
34 #include "arch-utils.h"
38 #include "darwin-nat.h"
39 #include "i386-darwin-tdep.h"
42 #include "amd64-nat.h"
43 #include "amd64-tdep.h"
44 #include "amd64-darwin-tdep.h"
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). */
51 i386_darwin_fetch_inferior_registers (struct target_ops
*ops
,
52 struct regcache
*regcache
, int regno
)
54 thread_t current_thread
= ptid_get_tid (inferior_ptid
);
56 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
59 if (gdbarch_ptr_bit (gdbarch
) == 64)
61 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
63 x86_thread_state_t gp_regs
;
64 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
67 ret
= thread_get_state
68 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) & gp_regs
,
70 if (ret
!= KERN_SUCCESS
)
72 printf_unfiltered (_("Error calling thread_get_state for "
73 "GP registers for thread 0x%ulx"),
75 MACH_CHECK_ERROR (ret
);
77 amd64_supply_native_gregset (regcache
, &gp_regs
.uts
, -1);
81 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
83 x86_float_state_t fp_regs
;
84 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
87 ret
= thread_get_state
88 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
90 if (ret
!= KERN_SUCCESS
)
92 printf_unfiltered (_("Error calling thread_get_state for "
93 "float registers for thread 0x%ulx"),
95 MACH_CHECK_ERROR (ret
);
97 amd64_supply_fxsave (regcache
, -1, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
104 if (regno
== -1 || regno
< I386_NUM_GREGS
)
106 i386_thread_state_t gp_regs
;
107 unsigned int gp_count
= i386_THREAD_STATE_COUNT
;
111 ret
= thread_get_state
112 (current_thread
, i386_THREAD_STATE
, (thread_state_t
) & gp_regs
,
114 if (ret
!= KERN_SUCCESS
)
116 printf_unfiltered (_("Error calling thread_get_state for "
117 "GP registers for thread 0x%ulx"),
119 MACH_CHECK_ERROR (ret
);
121 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
124 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
130 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
132 i386_float_state_t fp_regs
;
133 unsigned int fp_count
= i386_FLOAT_STATE_COUNT
;
136 ret
= thread_get_state
137 (current_thread
, i386_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
139 if (ret
!= KERN_SUCCESS
)
141 printf_unfiltered (_("Error calling thread_get_state for "
142 "float registers for thread 0x%ulx"),
144 MACH_CHECK_ERROR (ret
);
146 i387_supply_fxsave (regcache
, -1, &fp_regs
.__fpu_fcw
);
153 warning (_("unknown register %d"), regno
);
154 regcache_raw_supply (regcache
, regno
, NULL
);
158 /* Store our register values back into the inferior.
159 If REGNO is -1, do this for all registers.
160 Otherwise, REGNO specifies which register (so we can save time). */
163 i386_darwin_store_inferior_registers (struct target_ops
*ops
,
164 struct regcache
*regcache
, int regno
)
166 thread_t current_thread
= ptid_get_tid (inferior_ptid
);
167 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
170 if (gdbarch_ptr_bit (gdbarch
) == 64)
172 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
174 x86_thread_state_t gp_regs
;
176 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
178 ret
= thread_get_state
179 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) &gp_regs
,
181 MACH_CHECK_ERROR (ret
);
182 gdb_assert (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
);
183 gdb_assert (gp_regs
.tsh
.count
== x86_THREAD_STATE64_COUNT
);
185 amd64_collect_native_gregset (regcache
, &gp_regs
.uts
, regno
);
187 ret
= thread_set_state (current_thread
, x86_THREAD_STATE
,
188 (thread_state_t
) &gp_regs
,
189 x86_THREAD_STATE_COUNT
);
190 MACH_CHECK_ERROR (ret
);
193 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
195 x86_float_state_t fp_regs
;
197 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
199 ret
= thread_get_state
200 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
202 MACH_CHECK_ERROR (ret
);
203 gdb_assert (fp_regs
.fsh
.flavor
== x86_FLOAT_STATE64
);
204 gdb_assert (fp_regs
.fsh
.count
== x86_FLOAT_STATE64_COUNT
);
206 amd64_collect_fxsave (regcache
, regno
, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
208 ret
= thread_set_state (current_thread
, x86_FLOAT_STATE
,
209 (thread_state_t
) & fp_regs
,
210 x86_FLOAT_STATE_COUNT
);
211 MACH_CHECK_ERROR (ret
);
217 if (regno
== -1 || regno
< I386_NUM_GREGS
)
219 i386_thread_state_t gp_regs
;
221 unsigned int gp_count
= i386_THREAD_STATE_COUNT
;
224 ret
= thread_get_state
225 (current_thread
, i386_THREAD_STATE
, (thread_state_t
) & gp_regs
,
227 MACH_CHECK_ERROR (ret
);
229 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
230 if (regno
== -1 || regno
== i
)
233 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
235 ret
= thread_set_state (current_thread
, i386_THREAD_STATE
,
236 (thread_state_t
) & gp_regs
,
237 i386_THREAD_STATE_COUNT
);
238 MACH_CHECK_ERROR (ret
);
242 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
244 i386_float_state_t fp_regs
;
245 unsigned int fp_count
= i386_FLOAT_STATE_COUNT
;
248 ret
= thread_get_state
249 (current_thread
, i386_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
251 MACH_CHECK_ERROR (ret
);
253 i387_collect_fxsave (regcache
, regno
, &fp_regs
.__fpu_fcw
);
255 ret
= thread_set_state (current_thread
, i386_FLOAT_STATE
,
256 (thread_state_t
) & fp_regs
,
257 i386_FLOAT_STATE_COUNT
);
258 MACH_CHECK_ERROR (ret
);
264 /* Support for debug registers, boosted mostly from i386-linux-nat.c. */
267 i386_darwin_dr_set (int regnum
, uint32_t value
)
270 thread_t current_thread
;
271 x86_debug_state_t dr_regs
;
273 unsigned int dr_count
= x86_DEBUG_STATE_COUNT
;
275 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
277 current_thread
= ptid_get_tid (inferior_ptid
);
279 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE32
;
280 dr_regs
.dsh
.count
= x86_DEBUG_STATE32_COUNT
;
281 dr_count
= x86_DEBUG_STATE_COUNT
;
282 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
283 (thread_state_t
) &dr_regs
, &dr_count
);
285 if (ret
!= KERN_SUCCESS
)
287 printf_unfiltered (_("Error reading debug registers "
288 "thread 0x%x via thread_get_state\n"),
289 (int) current_thread
);
290 MACH_CHECK_ERROR (ret
);
296 dr_regs
.uds
.ds32
.__dr0
= value
;
299 dr_regs
.uds
.ds32
.__dr1
= value
;
302 dr_regs
.uds
.ds32
.__dr2
= value
;
305 dr_regs
.uds
.ds32
.__dr3
= value
;
308 dr_regs
.uds
.ds32
.__dr4
= value
;
311 dr_regs
.uds
.ds32
.__dr5
= value
;
314 dr_regs
.uds
.ds32
.__dr6
= value
;
317 dr_regs
.uds
.ds32
.__dr7
= value
;
321 ret
= thread_set_state (current_thread
, x86_DEBUG_STATE
,
322 (thread_state_t
) &dr_regs
, dr_count
);
324 if (ret
!= KERN_SUCCESS
)
326 printf_unfiltered (_("Error writing debug registers "
327 "thread 0x%x via thread_get_state\n"),
328 (int) current_thread
);
329 MACH_CHECK_ERROR (ret
);
334 i386_darwin_dr_get (int regnum
)
336 thread_t current_thread
;
337 x86_debug_state_t dr_regs
;
339 unsigned int dr_count
= x86_DEBUG_STATE_COUNT
;
341 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
343 current_thread
= ptid_get_tid (inferior_ptid
);
345 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE32
;
346 dr_regs
.dsh
.count
= x86_DEBUG_STATE32_COUNT
;
347 dr_count
= x86_DEBUG_STATE_COUNT
;
348 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
349 (thread_state_t
) &dr_regs
, &dr_count
);
351 if (ret
!= KERN_SUCCESS
)
353 printf_unfiltered (_("Error reading debug registers "
354 "thread 0x%x via thread_get_state\n"),
355 (int) current_thread
);
356 MACH_CHECK_ERROR (ret
);
362 return dr_regs
.uds
.ds32
.__dr0
;
364 return dr_regs
.uds
.ds32
.__dr1
;
366 return dr_regs
.uds
.ds32
.__dr2
;
368 return dr_regs
.uds
.ds32
.__dr3
;
370 return dr_regs
.uds
.ds32
.__dr4
;
372 return dr_regs
.uds
.ds32
.__dr5
;
374 return dr_regs
.uds
.ds32
.__dr6
;
376 return dr_regs
.uds
.ds32
.__dr7
;
383 i386_darwin_dr_set_control (unsigned long control
)
385 i386_darwin_dr_set (DR_CONTROL
, control
);
389 i386_darwin_dr_set_addr (int regnum
, CORE_ADDR addr
)
391 gdb_assert (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
);
393 i386_darwin_dr_set (DR_FIRSTADDR
+ regnum
, addr
);
397 i386_darwin_dr_get_addr (int regnum
)
399 return i386_darwin_dr_get (regnum
);
403 i386_darwin_dr_get_status (void)
405 return i386_darwin_dr_get (DR_STATUS
);
409 i386_darwin_dr_get_control (void)
411 return i386_darwin_dr_get (DR_CONTROL
);
415 darwin_check_osabi (darwin_inferior
*inf
, thread_t thread
)
417 if (gdbarch_osabi (target_gdbarch
) == GDB_OSABI_UNKNOWN
)
419 /* Attaching to a process. Let's figure out what kind it is. */
420 x86_thread_state_t gp_regs
;
421 struct gdbarch_info info
;
422 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
425 ret
= thread_get_state (thread
, x86_THREAD_STATE
,
426 (thread_state_t
) &gp_regs
, &gp_count
);
427 if (ret
!= KERN_SUCCESS
)
429 MACH_CHECK_ERROR (ret
);
433 gdbarch_info_init (&info
);
434 gdbarch_info_fill (&info
);
435 info
.byte_order
= gdbarch_byte_order (target_gdbarch
);
436 info
.osabi
= GDB_OSABI_DARWIN
;
437 if (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
)
438 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
441 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
443 gdbarch_update_p (info
);
447 #define X86_EFLAGS_T 0x100UL
449 /* Returning from a signal trampoline is done by calling a
450 special system call (sigreturn). This system call
451 restores the registers that were saved when the signal was
452 raised, including %eflags/%rflags. That means that single-stepping
453 won't work. Instead, we'll have to modify the signal context
454 that's about to be restored, and set the trace flag there. */
457 i386_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
459 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
460 static const gdb_byte darwin_syscall
[] = { 0xcd, 0x80 }; /* int 0x80 */
461 gdb_byte buf
[sizeof (darwin_syscall
)];
463 /* Check if PC is at a sigreturn system call. */
464 if (target_read_memory (regs
->uts
.ts32
.__eip
, buf
, sizeof (buf
)) == 0
465 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
466 && regs
->uts
.ts32
.__eax
== 0xb8 /* SYS_sigreturn */)
473 uctx_addr
= read_memory_unsigned_integer
474 (regs
->uts
.ts32
.__esp
+ 4, 4, byte_order
);
475 mctx_addr
= read_memory_unsigned_integer
476 (uctx_addr
+ 28, 4, byte_order
);
478 flags_addr
= mctx_addr
+ 12 + 9 * 4;
479 read_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
480 eflags
|= X86_EFLAGS_T
;
481 write_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
490 amd64_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
492 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch
);
493 static const gdb_byte darwin_syscall
[] = { 0x0f, 0x05 }; /* syscall */
494 gdb_byte buf
[sizeof (darwin_syscall
)];
496 /* Check if PC is at a sigreturn system call. */
497 if (target_read_memory (regs
->uts
.ts64
.__rip
, buf
, sizeof (buf
)) == 0
498 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
499 && (regs
->uts
.ts64
.__rax
& 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
505 mctx_addr
= read_memory_unsigned_integer
506 (regs
->uts
.ts64
.__rdi
+ 48, 8, byte_order
);
507 flags_addr
= mctx_addr
+ 16 + 17 * 8;
509 /* AMD64 is little endian. */
510 read_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
511 rflags
|= X86_EFLAGS_T
;
512 write_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
521 darwin_set_sstep (thread_t thread
, int enable
)
523 x86_thread_state_t regs
;
524 unsigned int count
= x86_THREAD_STATE_COUNT
;
527 kret
= thread_get_state (thread
, x86_THREAD_STATE
,
528 (thread_state_t
) ®s
, &count
);
529 if (kret
!= KERN_SUCCESS
)
531 printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
536 switch (regs
.tsh
.flavor
)
538 case x86_THREAD_STATE32
:
540 __uint32_t bit
= enable
? X86_EFLAGS_T
: 0;
542 if (enable
&& i386_darwin_sstep_at_sigreturn (®s
))
544 if ((regs
.uts
.ts32
.__eflags
& X86_EFLAGS_T
) == bit
)
546 regs
.uts
.ts32
.__eflags
547 = (regs
.uts
.ts32
.__eflags
& ~X86_EFLAGS_T
) | bit
;
548 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
549 (thread_state_t
) ®s
, count
);
550 MACH_CHECK_ERROR (kret
);
554 case x86_THREAD_STATE64
:
556 __uint64_t bit
= enable
? X86_EFLAGS_T
: 0;
558 if (enable
&& amd64_darwin_sstep_at_sigreturn (®s
))
560 if ((regs
.uts
.ts64
.__rflags
& X86_EFLAGS_T
) == bit
)
562 regs
.uts
.ts64
.__rflags
563 = (regs
.uts
.ts64
.__rflags
& ~X86_EFLAGS_T
) | bit
;
564 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
565 (thread_state_t
) ®s
, count
);
566 MACH_CHECK_ERROR (kret
);
571 error (_("darwin_set_sstep: unknown flavour: %d"), regs
.tsh
.flavor
);
576 darwin_complete_target (struct target_ops
*target
)
579 amd64_native_gregset64_reg_offset
= amd64_darwin_thread_state_reg_offset
;
580 amd64_native_gregset64_num_regs
= amd64_darwin_thread_state_num_regs
;
581 amd64_native_gregset32_reg_offset
= i386_darwin_thread_state_reg_offset
;
582 amd64_native_gregset32_num_regs
= i386_darwin_thread_state_num_regs
;
585 target
->to_fetch_registers
= i386_darwin_fetch_inferior_registers
;
586 target
->to_store_registers
= i386_darwin_store_inferior_registers
;