1 /* Darwin support for GDB, the GNU debugger.
2 Copyright (C) 1997-2013 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%lx\n"),
74 (unsigned long) current_thread);
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%lx\n"),
94 (unsigned long) current_thread);
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 x86_thread_state32_t gp_regs;
107 unsigned int gp_count = x86_THREAD_STATE32_COUNT;
111 ret = thread_get_state
112 (current_thread, x86_THREAD_STATE32, (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%lx\n"),
118 (unsigned long) current_thread);
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 x86_float_state32_t fp_regs;
133 unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
136 ret = thread_get_state
137 (current_thread, x86_FLOAT_STATE32, (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%lx\n"),
143 (unsigned long) current_thread);
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 x86_thread_state32_t gp_regs;
221 unsigned int gp_count = x86_THREAD_STATE32_COUNT;
224 ret = thread_get_state
225 (current_thread, x86_THREAD_STATE32, (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, x86_THREAD_STATE32,
236 (thread_state_t) &gp_regs,
237 x86_THREAD_STATE32_COUNT);
238 MACH_CHECK_ERROR (ret);
242 || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
244 x86_float_state32_t fp_regs;
245 unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
248 ret = thread_get_state
249 (current_thread, x86_FLOAT_STATE32, (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, x86_FLOAT_STATE32,
256 (thread_state_t) &fp_regs,
257 x86_FLOAT_STATE32_COUNT);
258 MACH_CHECK_ERROR (ret);
263 /* Support for debug registers, boosted mostly from i386-linux-nat.c. */
266 i386_darwin_dr_set (int regnum, uint32_t value)
269 thread_t current_thread;
270 x86_debug_state_t dr_regs;
272 unsigned int dr_count;
274 gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
276 current_thread = ptid_get_tid (inferior_ptid);
278 dr_regs.dsh.flavor = x86_DEBUG_STATE;
279 dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
280 dr_count = x86_DEBUG_STATE_COUNT;
281 ret = thread_get_state (current_thread, x86_DEBUG_STATE,
282 (thread_state_t) &dr_regs, &dr_count);
284 if (ret != KERN_SUCCESS)
286 printf_unfiltered (_("Error reading debug registers "
287 "thread 0x%x via thread_get_state\n"),
288 (int) current_thread);
289 MACH_CHECK_ERROR (ret);
292 switch (dr_regs.dsh.flavor)
294 case x86_DEBUG_STATE32:
298 dr_regs.uds.ds32.__dr0 = value;
301 dr_regs.uds.ds32.__dr1 = value;
304 dr_regs.uds.ds32.__dr2 = value;
307 dr_regs.uds.ds32.__dr3 = value;
310 dr_regs.uds.ds32.__dr4 = value;
313 dr_regs.uds.ds32.__dr5 = value;
316 dr_regs.uds.ds32.__dr6 = value;
319 dr_regs.uds.ds32.__dr7 = value;
324 case x86_DEBUG_STATE64:
328 dr_regs.uds.ds64.__dr0 = value;
331 dr_regs.uds.ds64.__dr1 = value;
334 dr_regs.uds.ds64.__dr2 = value;
337 dr_regs.uds.ds64.__dr3 = value;
340 dr_regs.uds.ds64.__dr4 = value;
343 dr_regs.uds.ds64.__dr5 = value;
346 dr_regs.uds.ds64.__dr6 = value;
349 dr_regs.uds.ds64.__dr7 = value;
356 ret = thread_set_state (current_thread, x86_DEBUG_STATE,
357 (thread_state_t) &dr_regs, dr_count);
359 if (ret != KERN_SUCCESS)
361 printf_unfiltered (_("Error writing debug registers "
362 "thread 0x%x via thread_get_state\n"),
363 (int) current_thread);
364 MACH_CHECK_ERROR (ret);
369 i386_darwin_dr_get (int regnum)
371 thread_t current_thread;
372 x86_debug_state_t dr_regs;
374 unsigned int dr_count;
376 gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
378 current_thread = ptid_get_tid (inferior_ptid);
380 dr_regs.dsh.flavor = x86_DEBUG_STATE;
381 dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
382 dr_count = x86_DEBUG_STATE_COUNT;
383 ret = thread_get_state (current_thread, x86_DEBUG_STATE,
384 (thread_state_t) &dr_regs, &dr_count);
386 if (ret != KERN_SUCCESS)
388 printf_unfiltered (_("Error reading debug registers "
389 "thread 0x%x via thread_get_state\n"),
390 (int) current_thread);
391 MACH_CHECK_ERROR (ret);
394 switch (dr_regs.dsh.flavor)
396 case x86_DEBUG_STATE32:
400 return dr_regs.uds.ds32.__dr0;
402 return dr_regs.uds.ds32.__dr1;
404 return dr_regs.uds.ds32.__dr2;
406 return dr_regs.uds.ds32.__dr3;
408 return dr_regs.uds.ds32.__dr4;
410 return dr_regs.uds.ds32.__dr5;
412 return dr_regs.uds.ds32.__dr6;
414 return dr_regs.uds.ds32.__dr7;
420 case x86_DEBUG_STATE64:
424 return dr_regs.uds.ds64.__dr0;
426 return dr_regs.uds.ds64.__dr1;
428 return dr_regs.uds.ds64.__dr2;
430 return dr_regs.uds.ds64.__dr3;
432 return dr_regs.uds.ds64.__dr4;
434 return dr_regs.uds.ds64.__dr5;
436 return dr_regs.uds.ds64.__dr6;
438 return dr_regs.uds.ds64.__dr7;
450 i386_darwin_dr_set_control (unsigned long control)
452 i386_darwin_dr_set (DR_CONTROL, control);
456 i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
458 gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
460 i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
464 i386_darwin_dr_get_addr (int regnum)
466 return i386_darwin_dr_get (regnum);
470 i386_darwin_dr_get_status (void)
472 return i386_darwin_dr_get (DR_STATUS);
476 i386_darwin_dr_get_control (void)
478 return i386_darwin_dr_get (DR_CONTROL);
482 darwin_check_osabi (darwin_inferior *inf, thread_t thread)
484 if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN)
486 /* Attaching to a process. Let's figure out what kind it is. */
487 x86_thread_state_t gp_regs;
488 struct gdbarch_info info;
489 unsigned int gp_count = x86_THREAD_STATE_COUNT;
492 ret = thread_get_state (thread, x86_THREAD_STATE,
493 (thread_state_t) &gp_regs, &gp_count);
494 if (ret != KERN_SUCCESS)
496 MACH_CHECK_ERROR (ret);
500 gdbarch_info_init (&info);
501 gdbarch_info_fill (&info);
502 info.byte_order = gdbarch_byte_order (target_gdbarch ());
503 info.osabi = GDB_OSABI_DARWIN;
504 if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
505 info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
508 info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
510 gdbarch_update_p (info);
514 #define X86_EFLAGS_T 0x100UL
516 /* Returning from a signal trampoline is done by calling a
517 special system call (sigreturn). This system call
518 restores the registers that were saved when the signal was
519 raised, including %eflags/%rflags. That means that single-stepping
520 won't work. Instead, we'll have to modify the signal context
521 that's about to be restored, and set the trace flag there. */
524 i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
526 enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
527 static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
528 gdb_byte buf[sizeof (darwin_syscall)];
530 /* Check if PC is at a sigreturn system call. */
531 if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
532 && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
533 && regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
540 uctx_addr = read_memory_unsigned_integer
541 (regs->uts.ts32.__esp + 4, 4, byte_order);
542 mctx_addr = read_memory_unsigned_integer
543 (uctx_addr + 28, 4, byte_order);
545 flags_addr = mctx_addr + 12 + 9 * 4;
546 read_memory (flags_addr, (gdb_byte *) &eflags, 4);
547 eflags |= X86_EFLAGS_T;
548 write_memory (flags_addr, (gdb_byte *) &eflags, 4);
557 amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
559 enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
560 static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
561 gdb_byte buf[sizeof (darwin_syscall)];
563 /* Check if PC is at a sigreturn system call. */
564 if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
565 && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
566 && (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
572 mctx_addr = read_memory_unsigned_integer
573 (regs->uts.ts64.__rdi + 48, 8, byte_order);
574 flags_addr = mctx_addr + 16 + 17 * 8;
576 /* AMD64 is little endian. */
577 read_memory (flags_addr, (gdb_byte *) &rflags, 4);
578 rflags |= X86_EFLAGS_T;
579 write_memory (flags_addr, (gdb_byte *) &rflags, 4);
588 darwin_set_sstep (thread_t thread, int enable)
590 x86_thread_state_t regs;
591 unsigned int count = x86_THREAD_STATE_COUNT;
594 kret = thread_get_state (thread, x86_THREAD_STATE,
595 (thread_state_t) ®s, &count);
596 if (kret != KERN_SUCCESS)
598 printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
603 switch (regs.tsh.flavor)
605 case x86_THREAD_STATE32:
607 __uint32_t bit = enable ? X86_EFLAGS_T : 0;
609 if (enable && i386_darwin_sstep_at_sigreturn (®s))
611 if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit)
613 regs.uts.ts32.__eflags
614 = (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) | bit;
615 kret = thread_set_state (thread, x86_THREAD_STATE,
616 (thread_state_t) ®s, count);
617 MACH_CHECK_ERROR (kret);
621 case x86_THREAD_STATE64:
623 __uint64_t bit = enable ? X86_EFLAGS_T : 0;
625 if (enable && amd64_darwin_sstep_at_sigreturn (®s))
627 if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit)
629 regs.uts.ts64.__rflags
630 = (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) | bit;
631 kret = thread_set_state (thread, x86_THREAD_STATE,
632 (thread_state_t) ®s, count);
633 MACH_CHECK_ERROR (kret);
638 error (_("darwin_set_sstep: unknown flavour: %d"), regs.tsh.flavor);
643 darwin_complete_target (struct target_ops *target)
646 amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
647 amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs;
648 amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset;
649 amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs;
652 i386_use_watchpoints (target);
654 i386_dr_low.set_control = i386_darwin_dr_set_control;
655 i386_dr_low.set_addr = i386_darwin_dr_set_addr;
656 i386_dr_low.get_addr = i386_darwin_dr_get_addr;
657 i386_dr_low.get_status = i386_darwin_dr_get_status;
658 i386_dr_low.get_control = i386_darwin_dr_get_control;
660 /* Let's assume that the kernel is 64 bits iff the executable is. */
662 i386_set_debug_register_length (8);
664 i386_set_debug_register_length (4);
667 target->to_fetch_registers = i386_darwin_fetch_inferior_registers;
668 target->to_store_registers = i386_darwin_store_inferior_registers;