1 /* Darwin support for GDB, the GNU debugger.
2 Copyright (C) 1997-2018 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 struct i386_darwin_nat_target final
: public x86_nat_target
<darwin_nat_target
>
48 /* Add our register access methods. */
49 void fetch_registers (struct regcache
*, int) override
;
50 void store_registers (struct regcache
*, int) override
;
53 static struct i386_darwin_nat_target darwin_target
;
55 /* Read register values from the inferior process.
56 If REGNO is -1, do this for all registers.
57 Otherwise, REGNO specifies which register (so we can save time). */
60 i386_darwin_nat_target::fetch_registers (struct regcache
*regcache
, int regno
)
62 thread_t current_thread
= ptid_get_tid (regcache_get_ptid (regcache
));
64 struct gdbarch
*gdbarch
= regcache
->arch ();
67 if (gdbarch_ptr_bit (gdbarch
) == 64)
69 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
71 x86_thread_state_t gp_regs
;
72 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
75 ret
= thread_get_state
76 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) & gp_regs
,
78 if (ret
!= KERN_SUCCESS
)
80 printf_unfiltered (_("Error calling thread_get_state for "
81 "GP registers for thread 0x%lx\n"),
82 (unsigned long) current_thread
);
83 MACH_CHECK_ERROR (ret
);
86 /* Some kernels don't sanitize the values. */
87 gp_regs
.uts
.ts64
.__fs
&= 0xffff;
88 gp_regs
.uts
.ts64
.__gs
&= 0xffff;
90 amd64_supply_native_gregset (regcache
, &gp_regs
.uts
, -1);
94 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
96 x86_float_state_t fp_regs
;
97 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
100 ret
= thread_get_state
101 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
103 if (ret
!= KERN_SUCCESS
)
105 printf_unfiltered (_("Error calling thread_get_state for "
106 "float registers for thread 0x%lx\n"),
107 (unsigned long) current_thread
);
108 MACH_CHECK_ERROR (ret
);
110 amd64_supply_fxsave (regcache
, -1, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
117 if (regno
== -1 || regno
< I386_NUM_GREGS
)
119 x86_thread_state32_t gp_regs
;
120 unsigned int gp_count
= x86_THREAD_STATE32_COUNT
;
124 ret
= thread_get_state
125 (current_thread
, x86_THREAD_STATE32
, (thread_state_t
) &gp_regs
,
127 if (ret
!= KERN_SUCCESS
)
129 printf_unfiltered (_("Error calling thread_get_state for "
130 "GP registers for thread 0x%lx\n"),
131 (unsigned long) current_thread
);
132 MACH_CHECK_ERROR (ret
);
134 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
137 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
143 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
145 x86_float_state32_t fp_regs
;
146 unsigned int fp_count
= x86_FLOAT_STATE32_COUNT
;
149 ret
= thread_get_state
150 (current_thread
, x86_FLOAT_STATE32
, (thread_state_t
) &fp_regs
,
152 if (ret
!= KERN_SUCCESS
)
154 printf_unfiltered (_("Error calling thread_get_state for "
155 "float registers for thread 0x%lx\n"),
156 (unsigned long) current_thread
);
157 MACH_CHECK_ERROR (ret
);
159 i387_supply_fxsave (regcache
, -1, &fp_regs
.__fpu_fcw
);
166 warning (_("unknown register %d"), regno
);
167 regcache_raw_supply (regcache
, regno
, NULL
);
171 /* Store our register values back into the inferior.
172 If REGNO is -1, do this for all registers.
173 Otherwise, REGNO specifies which register (so we can save time). */
176 i386_darwin_nat_target::store_registers (struct regcache
*regcache
,
179 thread_t current_thread
= ptid_get_tid (regcache_get_ptid (regcache
));
180 struct gdbarch
*gdbarch
= regcache
->arch ();
183 if (gdbarch_ptr_bit (gdbarch
) == 64)
185 if (regno
== -1 || amd64_native_gregset_supplies_p (gdbarch
, regno
))
187 x86_thread_state_t gp_regs
;
189 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
191 ret
= thread_get_state
192 (current_thread
, x86_THREAD_STATE
, (thread_state_t
) &gp_regs
,
194 MACH_CHECK_ERROR (ret
);
195 gdb_assert (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
);
196 gdb_assert (gp_regs
.tsh
.count
== x86_THREAD_STATE64_COUNT
);
198 amd64_collect_native_gregset (regcache
, &gp_regs
.uts
, regno
);
200 /* Some kernels don't sanitize the values. */
201 gp_regs
.uts
.ts64
.__fs
&= 0xffff;
202 gp_regs
.uts
.ts64
.__gs
&= 0xffff;
204 ret
= thread_set_state (current_thread
, x86_THREAD_STATE
,
205 (thread_state_t
) &gp_regs
,
206 x86_THREAD_STATE_COUNT
);
207 MACH_CHECK_ERROR (ret
);
210 if (regno
== -1 || !amd64_native_gregset_supplies_p (gdbarch
, regno
))
212 x86_float_state_t fp_regs
;
214 unsigned int fp_count
= x86_FLOAT_STATE_COUNT
;
216 ret
= thread_get_state
217 (current_thread
, x86_FLOAT_STATE
, (thread_state_t
) & fp_regs
,
219 MACH_CHECK_ERROR (ret
);
220 gdb_assert (fp_regs
.fsh
.flavor
== x86_FLOAT_STATE64
);
221 gdb_assert (fp_regs
.fsh
.count
== x86_FLOAT_STATE64_COUNT
);
223 amd64_collect_fxsave (regcache
, regno
, &fp_regs
.ufs
.fs64
.__fpu_fcw
);
225 ret
= thread_set_state (current_thread
, x86_FLOAT_STATE
,
226 (thread_state_t
) & fp_regs
,
227 x86_FLOAT_STATE_COUNT
);
228 MACH_CHECK_ERROR (ret
);
234 if (regno
== -1 || regno
< I386_NUM_GREGS
)
236 x86_thread_state32_t gp_regs
;
238 unsigned int gp_count
= x86_THREAD_STATE32_COUNT
;
241 ret
= thread_get_state
242 (current_thread
, x86_THREAD_STATE32
, (thread_state_t
) &gp_regs
,
244 MACH_CHECK_ERROR (ret
);
246 for (i
= 0; i
< I386_NUM_GREGS
; i
++)
247 if (regno
== -1 || regno
== i
)
250 (char *)&gp_regs
+ i386_darwin_thread_state_reg_offset
[i
]);
252 ret
= thread_set_state (current_thread
, x86_THREAD_STATE32
,
253 (thread_state_t
) &gp_regs
,
254 x86_THREAD_STATE32_COUNT
);
255 MACH_CHECK_ERROR (ret
);
259 || (regno
>= I386_ST0_REGNUM
&& regno
< I386_SSE_NUM_REGS
))
261 x86_float_state32_t fp_regs
;
262 unsigned int fp_count
= x86_FLOAT_STATE32_COUNT
;
265 ret
= thread_get_state
266 (current_thread
, x86_FLOAT_STATE32
, (thread_state_t
) & fp_regs
,
268 MACH_CHECK_ERROR (ret
);
270 i387_collect_fxsave (regcache
, regno
, &fp_regs
.__fpu_fcw
);
272 ret
= thread_set_state (current_thread
, x86_FLOAT_STATE32
,
273 (thread_state_t
) &fp_regs
,
274 x86_FLOAT_STATE32_COUNT
);
275 MACH_CHECK_ERROR (ret
);
280 /* Support for debug registers, boosted mostly from i386-linux-nat.c. */
283 i386_darwin_dr_set (int regnum
, CORE_ADDR value
)
286 thread_t current_thread
;
287 x86_debug_state_t dr_regs
;
289 unsigned int dr_count
;
291 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
293 current_thread
= ptid_get_tid (inferior_ptid
);
295 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE
;
296 dr_regs
.dsh
.count
= x86_DEBUG_STATE_COUNT
;
297 dr_count
= x86_DEBUG_STATE_COUNT
;
298 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
299 (thread_state_t
) &dr_regs
, &dr_count
);
300 MACH_CHECK_ERROR (ret
);
302 switch (dr_regs
.dsh
.flavor
)
304 case x86_DEBUG_STATE32
:
308 dr_regs
.uds
.ds32
.__dr0
= value
;
311 dr_regs
.uds
.ds32
.__dr1
= value
;
314 dr_regs
.uds
.ds32
.__dr2
= value
;
317 dr_regs
.uds
.ds32
.__dr3
= value
;
320 dr_regs
.uds
.ds32
.__dr4
= value
;
323 dr_regs
.uds
.ds32
.__dr5
= value
;
326 dr_regs
.uds
.ds32
.__dr6
= value
;
329 dr_regs
.uds
.ds32
.__dr7
= value
;
334 case x86_DEBUG_STATE64
:
338 dr_regs
.uds
.ds64
.__dr0
= value
;
341 dr_regs
.uds
.ds64
.__dr1
= value
;
344 dr_regs
.uds
.ds64
.__dr2
= value
;
347 dr_regs
.uds
.ds64
.__dr3
= value
;
350 dr_regs
.uds
.ds64
.__dr4
= value
;
353 dr_regs
.uds
.ds64
.__dr5
= value
;
356 dr_regs
.uds
.ds64
.__dr6
= value
;
359 dr_regs
.uds
.ds64
.__dr7
= value
;
366 ret
= thread_set_state (current_thread
, dr_regs
.dsh
.flavor
,
367 (thread_state_t
) &dr_regs
.uds
, dr_count
);
369 MACH_CHECK_ERROR (ret
);
373 i386_darwin_dr_get (int regnum
)
375 thread_t current_thread
;
376 x86_debug_state_t dr_regs
;
378 unsigned int dr_count
;
380 gdb_assert (regnum
>= 0 && regnum
<= DR_CONTROL
);
382 current_thread
= ptid_get_tid (inferior_ptid
);
384 dr_regs
.dsh
.flavor
= x86_DEBUG_STATE
;
385 dr_regs
.dsh
.count
= x86_DEBUG_STATE_COUNT
;
386 dr_count
= x86_DEBUG_STATE_COUNT
;
387 ret
= thread_get_state (current_thread
, x86_DEBUG_STATE
,
388 (thread_state_t
) &dr_regs
, &dr_count
);
389 MACH_CHECK_ERROR (ret
);
391 switch (dr_regs
.dsh
.flavor
)
393 case x86_DEBUG_STATE32
:
397 return dr_regs
.uds
.ds32
.__dr0
;
399 return dr_regs
.uds
.ds32
.__dr1
;
401 return dr_regs
.uds
.ds32
.__dr2
;
403 return dr_regs
.uds
.ds32
.__dr3
;
405 return dr_regs
.uds
.ds32
.__dr4
;
407 return dr_regs
.uds
.ds32
.__dr5
;
409 return dr_regs
.uds
.ds32
.__dr6
;
411 return dr_regs
.uds
.ds32
.__dr7
;
417 case x86_DEBUG_STATE64
:
421 return dr_regs
.uds
.ds64
.__dr0
;
423 return dr_regs
.uds
.ds64
.__dr1
;
425 return dr_regs
.uds
.ds64
.__dr2
;
427 return dr_regs
.uds
.ds64
.__dr3
;
429 return dr_regs
.uds
.ds64
.__dr4
;
431 return dr_regs
.uds
.ds64
.__dr5
;
433 return dr_regs
.uds
.ds64
.__dr6
;
435 return dr_regs
.uds
.ds64
.__dr7
;
447 i386_darwin_dr_set_control (unsigned long control
)
449 i386_darwin_dr_set (DR_CONTROL
, control
);
453 i386_darwin_dr_set_addr (int regnum
, CORE_ADDR addr
)
455 gdb_assert (regnum
>= 0 && regnum
<= DR_LASTADDR
- DR_FIRSTADDR
);
457 i386_darwin_dr_set (DR_FIRSTADDR
+ regnum
, addr
);
461 i386_darwin_dr_get_addr (int regnum
)
463 return i386_darwin_dr_get (regnum
);
467 i386_darwin_dr_get_status (void)
469 return i386_darwin_dr_get (DR_STATUS
);
473 i386_darwin_dr_get_control (void)
475 return i386_darwin_dr_get (DR_CONTROL
);
479 darwin_check_osabi (darwin_inferior
*inf
, thread_t thread
)
481 if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN
)
483 /* Attaching to a process. Let's figure out what kind it is. */
484 x86_thread_state_t gp_regs
;
485 struct gdbarch_info info
;
486 unsigned int gp_count
= x86_THREAD_STATE_COUNT
;
489 ret
= thread_get_state (thread
, x86_THREAD_STATE
,
490 (thread_state_t
) &gp_regs
, &gp_count
);
491 if (ret
!= KERN_SUCCESS
)
493 MACH_CHECK_ERROR (ret
);
497 gdbarch_info_init (&info
);
498 gdbarch_info_fill (&info
);
499 info
.byte_order
= gdbarch_byte_order (target_gdbarch ());
500 info
.osabi
= GDB_OSABI_DARWIN
;
501 if (gp_regs
.tsh
.flavor
== x86_THREAD_STATE64
)
502 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
505 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_i386
,
507 gdbarch_update_p (info
);
511 #define X86_EFLAGS_T 0x100UL
513 /* Returning from a signal trampoline is done by calling a
514 special system call (sigreturn). This system call
515 restores the registers that were saved when the signal was
516 raised, including %eflags/%rflags. That means that single-stepping
517 won't work. Instead, we'll have to modify the signal context
518 that's about to be restored, and set the trace flag there. */
521 i386_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
523 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
524 static const gdb_byte darwin_syscall
[] = { 0xcd, 0x80 }; /* int 0x80 */
525 gdb_byte buf
[sizeof (darwin_syscall
)];
527 /* Check if PC is at a sigreturn system call. */
528 if (target_read_memory (regs
->uts
.ts32
.__eip
, buf
, sizeof (buf
)) == 0
529 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
530 && regs
->uts
.ts32
.__eax
== 0xb8 /* SYS_sigreturn */)
537 uctx_addr
= read_memory_unsigned_integer
538 (regs
->uts
.ts32
.__esp
+ 4, 4, byte_order
);
539 mctx_addr
= read_memory_unsigned_integer
540 (uctx_addr
+ 28, 4, byte_order
);
542 flags_addr
= mctx_addr
+ 12 + 9 * 4;
543 read_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
544 eflags
|= X86_EFLAGS_T
;
545 write_memory (flags_addr
, (gdb_byte
*) &eflags
, 4);
554 amd64_darwin_sstep_at_sigreturn (x86_thread_state_t
*regs
)
556 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
557 static const gdb_byte darwin_syscall
[] = { 0x0f, 0x05 }; /* syscall */
558 gdb_byte buf
[sizeof (darwin_syscall
)];
560 /* Check if PC is at a sigreturn system call. */
561 if (target_read_memory (regs
->uts
.ts64
.__rip
, buf
, sizeof (buf
)) == 0
562 && memcmp (buf
, darwin_syscall
, sizeof (darwin_syscall
)) == 0
563 && (regs
->uts
.ts64
.__rax
& 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
569 mctx_addr
= read_memory_unsigned_integer
570 (regs
->uts
.ts64
.__rdi
+ 48, 8, byte_order
);
571 flags_addr
= mctx_addr
+ 16 + 17 * 8;
573 /* AMD64 is little endian. */
574 read_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
575 rflags
|= X86_EFLAGS_T
;
576 write_memory (flags_addr
, (gdb_byte
*) &rflags
, 4);
585 darwin_set_sstep (thread_t thread
, int enable
)
587 x86_thread_state_t regs
;
588 unsigned int count
= x86_THREAD_STATE_COUNT
;
591 kret
= thread_get_state (thread
, x86_THREAD_STATE
,
592 (thread_state_t
) ®s
, &count
);
593 if (kret
!= KERN_SUCCESS
)
595 printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
600 switch (regs
.tsh
.flavor
)
602 case x86_THREAD_STATE32
:
604 __uint32_t bit
= enable
? X86_EFLAGS_T
: 0;
606 if (enable
&& i386_darwin_sstep_at_sigreturn (®s
))
608 if ((regs
.uts
.ts32
.__eflags
& X86_EFLAGS_T
) == bit
)
610 regs
.uts
.ts32
.__eflags
611 = (regs
.uts
.ts32
.__eflags
& ~X86_EFLAGS_T
) | bit
;
612 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
613 (thread_state_t
) ®s
, count
);
614 MACH_CHECK_ERROR (kret
);
618 case x86_THREAD_STATE64
:
620 __uint64_t bit
= enable
? X86_EFLAGS_T
: 0;
622 if (enable
&& amd64_darwin_sstep_at_sigreturn (®s
))
624 if ((regs
.uts
.ts64
.__rflags
& X86_EFLAGS_T
) == bit
)
626 regs
.uts
.ts64
.__rflags
627 = (regs
.uts
.ts64
.__rflags
& ~X86_EFLAGS_T
) | bit
;
628 kret
= thread_set_state (thread
, x86_THREAD_STATE
,
629 (thread_state_t
) ®s
, count
);
630 MACH_CHECK_ERROR (kret
);
635 error (_("darwin_set_sstep: unknown flavour: %d"), regs
.tsh
.flavor
);
640 _initialize_i386_darwin_nat (void)
643 amd64_native_gregset64_reg_offset
= amd64_darwin_thread_state_reg_offset
;
644 amd64_native_gregset64_num_regs
= amd64_darwin_thread_state_num_regs
;
645 amd64_native_gregset32_reg_offset
= i386_darwin_thread_state_reg_offset
;
646 amd64_native_gregset32_num_regs
= i386_darwin_thread_state_num_regs
;
649 x86_dr_low
.set_control
= i386_darwin_dr_set_control
;
650 x86_dr_low
.set_addr
= i386_darwin_dr_set_addr
;
651 x86_dr_low
.get_addr
= i386_darwin_dr_get_addr
;
652 x86_dr_low
.get_status
= i386_darwin_dr_get_status
;
653 x86_dr_low
.get_control
= i386_darwin_dr_get_control
;
655 /* Let's assume that the kernel is 64 bits iff the executable is. */
657 x86_set_debug_register_length (8);
659 x86_set_debug_register_length (4);
662 add_inf_child_target (&darwin_target
);