1 /* Darwin support for GDB, the GNU debugger.
2 Copyright (C) 1997-2014 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 "i386-tdep.h"
31 #include "i387-tdep.h"
33 #include "arch-utils.h"
37 #include "darwin-nat.h"
38 #include "i386-darwin-tdep.h"
41 #include "amd64-nat.h"
42 #include "amd64-tdep.h"
43 #include "amd64-darwin-tdep.h"
46 /* Read register values from the inferior process.
47 If REGNO is -1, do this for all registers.
48 Otherwise, REGNO specifies which register (so we can save time). */
50 i386_darwin_fetch_inferior_registers (struct target_ops
*ops
,
51 struct regcache
*regcache
, int regno
)
53 thread_t current_thread
= ptid_get_tid (inferior_ptid
);
55 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
58 if (gdbarch_ptr_bit (gdbarch
) == 64)
60 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
62 x86_thread_state_t gp_regs
;
63 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
66 ret
= thread_get_state
67 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) & gp_regs
,
69 if (ret
!= KERN_SUCCESS
)
71 printf_unfiltered (_("Error calling thread_get_state for "
72 "GP registers for thread 0x%lx\n"),
73 (unsigned long) current_thread
);
74 MACH_CHECK_ERROR (ret
);
76 amd64_supply_native_gregset (regcache
, &gp_regs
.uts
, -1);
80 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
82 x86_float_state_t fp_regs
;
83 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
86 ret
= thread_get_state
87 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
89 if (ret
!= KERN_SUCCESS
)
91 printf_unfiltered (_("Error calling thread_get_state for "
92 "float registers for thread 0x%lx\n"),
93 (unsigned long) current_thread
);
94 MACH_CHECK_ERROR (ret
);
96 amd64_supply_fxsave (regcache
, -1, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
103 if (regno
== -1 || regno
< I386_NUM_GREGS
)
105 x86_thread_state32_t gp_regs
;
106 unsigned int gp_count
= x86_THREAD_STATE32_COUNT
;
110 ret
= thread_get_state
111 (current_thread
, x86_THREAD_STATE32
, (thread_state_t
) &gp_regs
,
113 if (ret
!= KERN_SUCCESS
)
115 printf_unfiltered (_("Error calling thread_get_state for "
116 "GP registers for thread 0x%lx\n"),
117 (unsigned long) current_thread
);
118 MACH_CHECK_ERROR (ret
);
120 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
123 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
129 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
131 x86_float_state32_t fp_regs
;
132 unsigned int fp_count
= x86_FLOAT_STATE32_COUNT
;
135 ret
= thread_get_state
136 (current_thread
, x86_FLOAT_STATE32
, (thread_state_t
) &fp_regs
,
138 if (ret
!= KERN_SUCCESS
)
140 printf_unfiltered (_("Error calling thread_get_state for "
141 "float registers for thread 0x%lx\n"),
142 (unsigned long) current_thread
);
143 MACH_CHECK_ERROR (ret
);
145 i387_supply_fxsave (regcache
, -1, &fp_regs
.__fpu_fcw
);
152 warning (_("unknown register %d"), regno
);
153 regcache_raw_supply (regcache
, regno
, NULL
);
157 /* Store our register values back into the inferior.
158 If REGNO is -1, do this for all registers.
159 Otherwise, REGNO specifies which register (so we can save time). */
162 i386_darwin_store_inferior_registers (struct target_ops
*ops
,
163 struct regcache
*regcache
, int regno
)
165 thread_t current_thread
= ptid_get_tid (inferior_ptid
);
166 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
169 if (gdbarch_ptr_bit (gdbarch
) == 64)
171 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
173 x86_thread_state_t gp_regs
;
175 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
177 ret
= thread_get_state
178 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) &gp_regs
,
180 MACH_CHECK_ERROR (ret
);
181 gdb_assert (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
);
182 gdb_assert (gp_regs
.tsh
.count
== x86_THREAD_STATE64_COUNT
);
184 amd64_collect_native_gregset (regcache
, &gp_regs
.uts
, regno
);
186 ret
= thread_set_state (current_thread
, x86_THREAD_STATE
,
187 (thread_state_t
) &gp_regs
,
188 x86_THREAD_STATE_COUNT
);
189 MACH_CHECK_ERROR (ret
);
192 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
194 x86_float_state_t fp_regs
;
196 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
198 ret
= thread_get_state
199 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
201 MACH_CHECK_ERROR (ret
);
202 gdb_assert (fp_regs
.fsh
.flavor
== x86_FLOAT_STATE64
);
203 gdb_assert (fp_regs
.fsh
.count
== x86_FLOAT_STATE64_COUNT
);
205 amd64_collect_fxsave (regcache
, regno
, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
207 ret
= thread_set_state (current_thread
, x86_FLOAT_STATE
,
208 (thread_state_t
) & fp_regs
,
209 x86_FLOAT_STATE_COUNT
);
210 MACH_CHECK_ERROR (ret
);
216 if (regno
== -1 || regno
< I386_NUM_GREGS
)
218 x86_thread_state32_t gp_regs
;
220 unsigned int gp_count
= x86_THREAD_STATE32_COUNT
;
223 ret
= thread_get_state
224 (current_thread
, x86_THREAD_STATE32
, (thread_state_t
) &gp_regs
,
226 MACH_CHECK_ERROR (ret
);
228 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
229 if (regno
== -1 || regno
== i
)
232 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
234 ret
= thread_set_state (current_thread
, x86_THREAD_STATE32
,
235 (thread_state_t
) &gp_regs
,
236 x86_THREAD_STATE32_COUNT
);
237 MACH_CHECK_ERROR (ret
);
241 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
243 x86_float_state32_t fp_regs
;
244 unsigned int fp_count
= x86_FLOAT_STATE32_COUNT
;
247 ret
= thread_get_state
248 (current_thread
, x86_FLOAT_STATE32
, (thread_state_t
) & fp_regs
,
250 MACH_CHECK_ERROR (ret
);
252 i387_collect_fxsave (regcache
, regno
, &fp_regs
.__fpu_fcw
);
254 ret
= thread_set_state (current_thread
, x86_FLOAT_STATE32
,
255 (thread_state_t
) &fp_regs
,
256 x86_FLOAT_STATE32_COUNT
);
257 MACH_CHECK_ERROR (ret
);
262 /* Support for debug registers, boosted mostly from i386-linux-nat.c. */
265 i386_darwin_dr_set (int regnum
, CORE_ADDR value
)
268 thread_t current_thread
;
269 x86_debug_state_t dr_regs
;
271 unsigned int dr_count
;
273 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
275 current_thread
= ptid_get_tid (inferior_ptid
);
277 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE
;
278 dr_regs
.dsh
.count
= x86_DEBUG_STATE_COUNT
;
279 dr_count
= x86_DEBUG_STATE_COUNT
;
280 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
281 (thread_state_t
) &dr_regs
, &dr_count
);
282 MACH_CHECK_ERROR (ret
);
284 switch (dr_regs
.dsh
.flavor
)
286 case x86_DEBUG_STATE32
:
290 dr_regs
.uds
.ds32
.__dr0
= value
;
293 dr_regs
.uds
.ds32
.__dr1
= value
;
296 dr_regs
.uds
.ds32
.__dr2
= value
;
299 dr_regs
.uds
.ds32
.__dr3
= value
;
302 dr_regs
.uds
.ds32
.__dr4
= value
;
305 dr_regs
.uds
.ds32
.__dr5
= value
;
308 dr_regs
.uds
.ds32
.__dr6
= value
;
311 dr_regs
.uds
.ds32
.__dr7
= value
;
316 case x86_DEBUG_STATE64
:
320 dr_regs
.uds
.ds64
.__dr0
= value
;
323 dr_regs
.uds
.ds64
.__dr1
= value
;
326 dr_regs
.uds
.ds64
.__dr2
= value
;
329 dr_regs
.uds
.ds64
.__dr3
= value
;
332 dr_regs
.uds
.ds64
.__dr4
= value
;
335 dr_regs
.uds
.ds64
.__dr5
= value
;
338 dr_regs
.uds
.ds64
.__dr6
= value
;
341 dr_regs
.uds
.ds64
.__dr7
= value
;
348 ret
= thread_set_state (current_thread
, dr_regs
.dsh
.flavor
,
349 (thread_state_t
) &dr_regs
.uds
, dr_count
);
351 MACH_CHECK_ERROR (ret
);
355 i386_darwin_dr_get (int regnum
)
357 thread_t current_thread
;
358 x86_debug_state_t dr_regs
;
360 unsigned int dr_count
;
362 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
364 current_thread
= ptid_get_tid (inferior_ptid
);
366 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE
;
367 dr_regs
.dsh
.count
= x86_DEBUG_STATE_COUNT
;
368 dr_count
= x86_DEBUG_STATE_COUNT
;
369 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
370 (thread_state_t
) &dr_regs
, &dr_count
);
371 MACH_CHECK_ERROR (ret
);
373 switch (dr_regs
.dsh
.flavor
)
375 case x86_DEBUG_STATE32
:
379 return dr_regs
.uds
.ds32
.__dr0
;
381 return dr_regs
.uds
.ds32
.__dr1
;
383 return dr_regs
.uds
.ds32
.__dr2
;
385 return dr_regs
.uds
.ds32
.__dr3
;
387 return dr_regs
.uds
.ds32
.__dr4
;
389 return dr_regs
.uds
.ds32
.__dr5
;
391 return dr_regs
.uds
.ds32
.__dr6
;
393 return dr_regs
.uds
.ds32
.__dr7
;
399 case x86_DEBUG_STATE64
:
403 return dr_regs
.uds
.ds64
.__dr0
;
405 return dr_regs
.uds
.ds64
.__dr1
;
407 return dr_regs
.uds
.ds64
.__dr2
;
409 return dr_regs
.uds
.ds64
.__dr3
;
411 return dr_regs
.uds
.ds64
.__dr4
;
413 return dr_regs
.uds
.ds64
.__dr5
;
415 return dr_regs
.uds
.ds64
.__dr6
;
417 return dr_regs
.uds
.ds64
.__dr7
;
429 i386_darwin_dr_set_control (unsigned long control
)
431 i386_darwin_dr_set (DR_CONTROL
, control
);
435 i386_darwin_dr_set_addr (int regnum
, CORE_ADDR addr
)
437 gdb_assert (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
);
439 i386_darwin_dr_set (DR_FIRSTADDR
+ regnum
, addr
);
443 i386_darwin_dr_get_addr (int regnum
)
445 return i386_darwin_dr_get (regnum
);
449 i386_darwin_dr_get_status (void)
451 return i386_darwin_dr_get (DR_STATUS
);
455 i386_darwin_dr_get_control (void)
457 return i386_darwin_dr_get (DR_CONTROL
);
461 darwin_check_osabi (darwin_inferior
*inf
, thread_t thread
)
463 if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN
)
465 /* Attaching to a process. Let's figure out what kind it is. */
466 x86_thread_state_t gp_regs
;
467 struct gdbarch_info info
;
468 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
471 ret
= thread_get_state (thread
, x86_THREAD_STATE
,
472 (thread_state_t
) &gp_regs
, &gp_count
);
473 if (ret
!= KERN_SUCCESS
)
475 MACH_CHECK_ERROR (ret
);
479 gdbarch_info_init (&info
);
480 gdbarch_info_fill (&info
);
481 info
.byte_order
= gdbarch_byte_order (target_gdbarch ());
482 info
.osabi
= GDB_OSABI_DARWIN
;
483 if (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
)
484 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
487 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
489 gdbarch_update_p (info
);
493 #define X86_EFLAGS_T 0x100UL
495 /* Returning from a signal trampoline is done by calling a
496 special system call (sigreturn). This system call
497 restores the registers that were saved when the signal was
498 raised, including %eflags/%rflags. That means that single-stepping
499 won't work. Instead, we'll have to modify the signal context
500 that's about to be restored, and set the trace flag there. */
503 i386_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
505 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
506 static const gdb_byte darwin_syscall
[] = { 0xcd, 0x80 }; /* int 0x80 */
507 gdb_byte buf
[sizeof (darwin_syscall
)];
509 /* Check if PC is at a sigreturn system call. */
510 if (target_read_memory (regs
->uts
.ts32
.__eip
, buf
, sizeof (buf
)) == 0
511 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
512 && regs
->uts
.ts32
.__eax
== 0xb8 /* SYS_sigreturn */)
519 uctx_addr
= read_memory_unsigned_integer
520 (regs
->uts
.ts32
.__esp
+ 4, 4, byte_order
);
521 mctx_addr
= read_memory_unsigned_integer
522 (uctx_addr
+ 28, 4, byte_order
);
524 flags_addr
= mctx_addr
+ 12 + 9 * 4;
525 read_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
526 eflags
|= X86_EFLAGS_T
;
527 write_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
536 amd64_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
538 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
539 static const gdb_byte darwin_syscall
[] = { 0x0f, 0x05 }; /* syscall */
540 gdb_byte buf
[sizeof (darwin_syscall
)];
542 /* Check if PC is at a sigreturn system call. */
543 if (target_read_memory (regs
->uts
.ts64
.__rip
, buf
, sizeof (buf
)) == 0
544 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
545 && (regs
->uts
.ts64
.__rax
& 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
551 mctx_addr
= read_memory_unsigned_integer
552 (regs
->uts
.ts64
.__rdi
+ 48, 8, byte_order
);
553 flags_addr
= mctx_addr
+ 16 + 17 * 8;
555 /* AMD64 is little endian. */
556 read_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
557 rflags
|= X86_EFLAGS_T
;
558 write_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
567 darwin_set_sstep (thread_t thread
, int enable
)
569 x86_thread_state_t regs
;
570 unsigned int count
= x86_THREAD_STATE_COUNT
;
573 kret
= thread_get_state (thread
, x86_THREAD_STATE
,
574 (thread_state_t
) ®s
, &count
);
575 if (kret
!= KERN_SUCCESS
)
577 printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
582 switch (regs
.tsh
.flavor
)
584 case x86_THREAD_STATE32
:
586 __uint32_t bit
= enable
? X86_EFLAGS_T
: 0;
588 if (enable
&& i386_darwin_sstep_at_sigreturn (®s
))
590 if ((regs
.uts
.ts32
.__eflags
& X86_EFLAGS_T
) == bit
)
592 regs
.uts
.ts32
.__eflags
593 = (regs
.uts
.ts32
.__eflags
& ~X86_EFLAGS_T
) | bit
;
594 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
595 (thread_state_t
) ®s
, count
);
596 MACH_CHECK_ERROR (kret
);
600 case x86_THREAD_STATE64
:
602 __uint64_t bit
= enable
? X86_EFLAGS_T
: 0;
604 if (enable
&& amd64_darwin_sstep_at_sigreturn (®s
))
606 if ((regs
.uts
.ts64
.__rflags
& X86_EFLAGS_T
) == bit
)
608 regs
.uts
.ts64
.__rflags
609 = (regs
.uts
.ts64
.__rflags
& ~X86_EFLAGS_T
) | bit
;
610 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
611 (thread_state_t
) ®s
, count
);
612 MACH_CHECK_ERROR (kret
);
617 error (_("darwin_set_sstep: unknown flavour: %d"), regs
.tsh
.flavor
);
622 darwin_complete_target (struct target_ops
*target
)
625 amd64_native_gregset64_reg_offset
= amd64_darwin_thread_state_reg_offset
;
626 amd64_native_gregset64_num_regs
= amd64_darwin_thread_state_num_regs
;
627 amd64_native_gregset32_reg_offset
= i386_darwin_thread_state_reg_offset
;
628 amd64_native_gregset32_num_regs
= i386_darwin_thread_state_num_regs
;
631 x86_use_watchpoints (target
);
633 x86_dr_low
.set_control
= i386_darwin_dr_set_control
;
634 x86_dr_low
.set_addr
= i386_darwin_dr_set_addr
;
635 x86_dr_low
.get_addr
= i386_darwin_dr_get_addr
;
636 x86_dr_low
.get_status
= i386_darwin_dr_get_status
;
637 x86_dr_low
.get_control
= i386_darwin_dr_get_control
;
639 /* Let's assume that the kernel is 64 bits iff the executable is. */
641 x86_set_debug_register_length (8);
643 x86_set_debug_register_length (4);
646 target
->to_fetch_registers
= i386_darwin_fetch_inferior_registers
;
647 target
->to_store_registers
= i386_darwin_store_inferior_registers
;