[deliverable/binutils-gdb.git] / gdb / i386-darwin-nat.c

/* Darwin support for GDB, the GNU debugger.
   Copyright (C) 1997-2013 Free Software Foundation, Inc.

   Contributed by Apple Computer, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
#include "symfile.h"
#include "symtab.h"
#include "objfiles.h"
#include "gdbcmd.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "gdbarch.h"
#include "arch-utils.h"
#include "gdbcore.h"

#include "i386-nat.h"
#include "darwin-nat.h"
#include "i386-darwin-tdep.h"

#ifdef BFD64
#include "amd64-nat.h"
#include "amd64-tdep.h"
#include "amd64-darwin-tdep.h"
#endif

/* Read register values from the inferior process.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */
static void
i386_darwin_fetch_inferior_registers (struct target_ops *ops,
				      struct regcache *regcache, int regno)
{
  thread_t current_thread = ptid_get_tid (inferior_ptid);
  int fetched = 0;
  struct gdbarch *gdbarch = get_regcache_arch (regcache);

#ifdef BFD64
  if (gdbarch_ptr_bit (gdbarch) == 64)
    {
      if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
        {
          x86_thread_state_t gp_regs;
          unsigned int gp_count = x86_THREAD_STATE_COUNT;
          kern_return_t ret;

	  ret = thread_get_state
            (current_thread, x86_THREAD_STATE, (thread_state_t) & gp_regs,
             &gp_count);
	  if (ret != KERN_SUCCESS)
	    {
	      printf_unfiltered (_("Error calling thread_get_state for "
				   "GP registers for thread 0x%lx\n"),
				 (unsigned long) current_thread);
	      MACH_CHECK_ERROR (ret);
	    }
	  amd64_supply_native_gregset (regcache, &gp_regs.uts, -1);
          fetched++;
        }

      if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
        {
          x86_float_state_t fp_regs;
          unsigned int fp_count = x86_FLOAT_STATE_COUNT;
          kern_return_t ret;

	  ret = thread_get_state
            (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
             &fp_count);
	  if (ret != KERN_SUCCESS)
	    {
	      printf_unfiltered (_("Error calling thread_get_state for "
				   "float registers for thread 0x%lx\n"),
				 (unsigned long) current_thread);
	      MACH_CHECK_ERROR (ret);
	    }
          amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw);
          fetched++;
        }
    }
  else
#endif
    {
      if (regno == -1 || regno < I386_NUM_GREGS)
        {
          x86_thread_state32_t gp_regs;
          unsigned int gp_count = x86_THREAD_STATE32_COUNT;
          kern_return_t ret;
	  int i;

	  ret = thread_get_state
            (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
             &gp_count);
	  if (ret != KERN_SUCCESS)
	    {
	      printf_unfiltered (_("Error calling thread_get_state for "
				   "GP registers for thread 0x%lx\n"),
				 (unsigned long) current_thread);
	      MACH_CHECK_ERROR (ret);
	    }
	  for (i = 0; i < I386_NUM_GREGS; i++)
	    regcache_raw_supply
	      (regcache, i,
	       (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);

          fetched++;
        }

      if (regno == -1
	  || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
        {
          x86_float_state32_t fp_regs;
          unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
          kern_return_t ret;

	  ret = thread_get_state
            (current_thread, x86_FLOAT_STATE32, (thread_state_t) &fp_regs,
             &fp_count);
	  if (ret != KERN_SUCCESS)
	    {
	      printf_unfiltered (_("Error calling thread_get_state for "
				   "float registers for thread 0x%lx\n"),
				 (unsigned long) current_thread);
	      MACH_CHECK_ERROR (ret);
	    }
          i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw);
          fetched++;
        }
    }

  if (! fetched)
    {
      warning (_("unknown register %d"), regno);
      regcache_raw_supply (regcache, regno, NULL);
    }
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */

static void
i386_darwin_store_inferior_registers (struct target_ops *ops,
				      struct regcache *regcache, int regno)
{
  thread_t current_thread = ptid_get_tid (inferior_ptid);
  struct gdbarch *gdbarch = get_regcache_arch (regcache);

#ifdef BFD64
  if (gdbarch_ptr_bit (gdbarch) == 64)
    {
      if (regno == -1 || amd64_native_gregset_supplies_p (gdbarch, regno))
        {
          x86_thread_state_t gp_regs;
          kern_return_t ret;
	  unsigned int gp_count = x86_THREAD_STATE_COUNT;

	  ret = thread_get_state
	    (current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs,
	     &gp_count);
          MACH_CHECK_ERROR (ret);
	  gdb_assert (gp_regs.tsh.flavor == x86_THREAD_STATE64);
          gdb_assert (gp_regs.tsh.count == x86_THREAD_STATE64_COUNT);

	  amd64_collect_native_gregset (regcache, &gp_regs.uts, regno);

          ret = thread_set_state (current_thread, x86_THREAD_STATE,
                                  (thread_state_t) &gp_regs,
                                  x86_THREAD_STATE_COUNT);
          MACH_CHECK_ERROR (ret);
        }

      if (regno == -1 || !amd64_native_gregset_supplies_p (gdbarch, regno))
        {
          x86_float_state_t fp_regs;
          kern_return_t ret;
	  unsigned int fp_count = x86_FLOAT_STATE_COUNT;

	  ret = thread_get_state
	    (current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
	     &fp_count);
          MACH_CHECK_ERROR (ret);
          gdb_assert (fp_regs.fsh.flavor == x86_FLOAT_STATE64);
          gdb_assert (fp_regs.fsh.count == x86_FLOAT_STATE64_COUNT);

	  amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw);

	  ret = thread_set_state (current_thread, x86_FLOAT_STATE,
				  (thread_state_t) & fp_regs,
				  x86_FLOAT_STATE_COUNT);
	  MACH_CHECK_ERROR (ret);
        }
    }
  else
#endif
    {
      if (regno == -1 || regno < I386_NUM_GREGS)
        {
          x86_thread_state32_t gp_regs;
          kern_return_t ret;
          unsigned int gp_count = x86_THREAD_STATE32_COUNT;
	  int i;

          ret = thread_get_state
            (current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
             &gp_count);
	  MACH_CHECK_ERROR (ret);

	  for (i = 0; i < I386_NUM_GREGS; i++)
	    if (regno == -1 || regno == i)
	      regcache_raw_collect
		(regcache, i,
		 (char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);

          ret = thread_set_state (current_thread, x86_THREAD_STATE32,
                                  (thread_state_t) &gp_regs,
                                  x86_THREAD_STATE32_COUNT);
          MACH_CHECK_ERROR (ret);
        }

      if (regno == -1
	  || (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
        {
          x86_float_state32_t fp_regs;
          unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
          kern_return_t ret;

	  ret = thread_get_state
            (current_thread, x86_FLOAT_STATE32, (thread_state_t) & fp_regs,
             &fp_count);
	  MACH_CHECK_ERROR (ret);

	  i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw);

	  ret = thread_set_state (current_thread, x86_FLOAT_STATE32,
				  (thread_state_t) &fp_regs,
				  x86_FLOAT_STATE32_COUNT);
	  MACH_CHECK_ERROR (ret);
        }
    }
}

/* Support for debug registers, boosted mostly from i386-linux-nat.c.  */

static void
i386_darwin_dr_set (int regnum, CORE_ADDR value)
{
  int current_pid;
  thread_t current_thread;
  x86_debug_state_t dr_regs;
  kern_return_t ret;
  unsigned int dr_count;

  gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);

  current_thread = ptid_get_tid (inferior_ptid);

  dr_regs.dsh.flavor = x86_DEBUG_STATE;
  dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
  dr_count = x86_DEBUG_STATE_COUNT;
  ret = thread_get_state (current_thread, x86_DEBUG_STATE,
                          (thread_state_t) &dr_regs, &dr_count);
  MACH_CHECK_ERROR (ret);

  switch (dr_regs.dsh.flavor)
    {
    case x86_DEBUG_STATE32:
      switch (regnum)
	{
	case 0:
	  dr_regs.uds.ds32.__dr0 = value;
	  break;
	case 1:
	  dr_regs.uds.ds32.__dr1 = value;
	  break;
	case 2:
	  dr_regs.uds.ds32.__dr2 = value;
	  break;
	case 3:
	  dr_regs.uds.ds32.__dr3 = value;
	  break;
	case 4:
	  dr_regs.uds.ds32.__dr4 = value;
	  break;
	case 5:
	  dr_regs.uds.ds32.__dr5 = value;
	  break;
	case 6:
	  dr_regs.uds.ds32.__dr6 = value;
	  break;
	case 7:
	  dr_regs.uds.ds32.__dr7 = value;
	  break;
	}
      break;
#ifdef BFD64
    case x86_DEBUG_STATE64:
      switch (regnum)
	{
	case 0:
	  dr_regs.uds.ds64.__dr0 = value;
	  break;
	case 1:
	  dr_regs.uds.ds64.__dr1 = value;
	  break;
	case 2:
	  dr_regs.uds.ds64.__dr2 = value;
	  break;
	case 3:
	  dr_regs.uds.ds64.__dr3 = value;
	  break;
	case 4:
	  dr_regs.uds.ds64.__dr4 = value;
	  break;
	case 5:
	  dr_regs.uds.ds64.__dr5 = value;
	  break;
	case 6:
	  dr_regs.uds.ds64.__dr6 = value;
	  break;
	case 7:
	  dr_regs.uds.ds64.__dr7 = value;
	  break;
	}
      break;
#endif
    }

  ret = thread_set_state (current_thread, dr_regs.dsh.flavor,
                          (thread_state_t) &dr_regs.uds, dr_count);

  MACH_CHECK_ERROR (ret);
}

static CORE_ADDR
i386_darwin_dr_get (int regnum)
{
  thread_t current_thread;
  x86_debug_state_t dr_regs;
  kern_return_t ret;
  unsigned int dr_count;

  gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);

  current_thread = ptid_get_tid (inferior_ptid);

  dr_regs.dsh.flavor = x86_DEBUG_STATE;
  dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
  dr_count = x86_DEBUG_STATE_COUNT;
  ret = thread_get_state (current_thread, x86_DEBUG_STATE,
                          (thread_state_t) &dr_regs, &dr_count);
  MACH_CHECK_ERROR (ret);

  switch (dr_regs.dsh.flavor)
    {
    case x86_DEBUG_STATE32:
      switch (regnum)
	{
	case 0:
	  return dr_regs.uds.ds32.__dr0;
	case 1:
	  return dr_regs.uds.ds32.__dr1;
	case 2:
	  return dr_regs.uds.ds32.__dr2;
	case 3:
	  return dr_regs.uds.ds32.__dr3;
	case 4:
	  return dr_regs.uds.ds32.__dr4;
	case 5:
	  return dr_regs.uds.ds32.__dr5;
	case 6:
	  return dr_regs.uds.ds32.__dr6;
	case 7:
	  return dr_regs.uds.ds32.__dr7;
	default:
	  return -1;
	}
      break;
#ifdef BFD64
    case x86_DEBUG_STATE64:
      switch (regnum)
	{
	case 0:
	  return dr_regs.uds.ds64.__dr0;
	case 1:
	  return dr_regs.uds.ds64.__dr1;
	case 2:
	  return dr_regs.uds.ds64.__dr2;
	case 3:
	  return dr_regs.uds.ds64.__dr3;
	case 4:
	  return dr_regs.uds.ds64.__dr4;
	case 5:
	  return dr_regs.uds.ds64.__dr5;
	case 6:
	  return dr_regs.uds.ds64.__dr6;
	case 7:
	  return dr_regs.uds.ds64.__dr7;
	default:
	  return -1;
	}
      break;
#endif
    default:
      return -1;
    }
}

static void
i386_darwin_dr_set_control (unsigned long control)
{
  i386_darwin_dr_set (DR_CONTROL, control);
}

static void
i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
{
  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);

  i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
}

static CORE_ADDR
i386_darwin_dr_get_addr (int regnum)
{
  return i386_darwin_dr_get (regnum);
}

static unsigned long
i386_darwin_dr_get_status (void)
{
  return i386_darwin_dr_get (DR_STATUS);
}

static unsigned long
i386_darwin_dr_get_control (void)
{
  return i386_darwin_dr_get (DR_CONTROL);
}

void
darwin_check_osabi (darwin_inferior *inf, thread_t thread)
{
  if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN)
    {
      /* Attaching to a process.  Let's figure out what kind it is.  */
      x86_thread_state_t gp_regs;
      struct gdbarch_info info;
      unsigned int gp_count = x86_THREAD_STATE_COUNT;
      kern_return_t ret;

      ret = thread_get_state (thread, x86_THREAD_STATE,
			      (thread_state_t) &gp_regs, &gp_count);
      if (ret != KERN_SUCCESS)
	{
	  MACH_CHECK_ERROR (ret);
	  return;
	}

      gdbarch_info_init (&info);
      gdbarch_info_fill (&info);
      info.byte_order = gdbarch_byte_order (target_gdbarch ());
      info.osabi = GDB_OSABI_DARWIN;
      if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
	info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
					      bfd_mach_x86_64);
      else
	info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
					      bfd_mach_i386_i386);
      gdbarch_update_p (info);
    }
}

#define X86_EFLAGS_T 0x100UL

/* Returning from a signal trampoline is done by calling a
   special system call (sigreturn).  This system call
   restores the registers that were saved when the signal was
   raised, including %eflags/%rflags.  That means that single-stepping
   won't work.  Instead, we'll have to modify the signal context
   that's about to be restored, and set the trace flag there.  */

static int
i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
{
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
  gdb_byte buf[sizeof (darwin_syscall)];

  /* Check if PC is at a sigreturn system call.  */
  if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
      && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
      && regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
    {
      ULONGEST uctx_addr;
      ULONGEST mctx_addr;
      ULONGEST flags_addr;
      unsigned int eflags;

      uctx_addr = read_memory_unsigned_integer
		    (regs->uts.ts32.__esp + 4, 4, byte_order);
      mctx_addr = read_memory_unsigned_integer
		    (uctx_addr + 28, 4, byte_order);

      flags_addr = mctx_addr + 12 + 9 * 4;
      read_memory (flags_addr, (gdb_byte *) &eflags, 4);
      eflags |= X86_EFLAGS_T;
      write_memory (flags_addr, (gdb_byte *) &eflags, 4);

      return 1;
    }
  return 0;
}

#ifdef BFD64
static int
amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
{
  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
  static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
  gdb_byte buf[sizeof (darwin_syscall)];

  /* Check if PC is at a sigreturn system call.  */
  if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
      && memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
      && (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
    {
      ULONGEST mctx_addr;
      ULONGEST flags_addr;
      unsigned int rflags;

      mctx_addr = read_memory_unsigned_integer
		    (regs->uts.ts64.__rdi + 48, 8, byte_order);
      flags_addr = mctx_addr + 16 + 17 * 8;

      /* AMD64 is little endian.  */
      read_memory (flags_addr, (gdb_byte *) &rflags, 4);
      rflags |= X86_EFLAGS_T;
      write_memory (flags_addr, (gdb_byte *) &rflags, 4);

      return 1;
    }
  return 0;
}
#endif

void
darwin_set_sstep (thread_t thread, int enable)
{
  x86_thread_state_t regs;
  unsigned int count = x86_THREAD_STATE_COUNT;
  kern_return_t kret;

  kret = thread_get_state (thread, x86_THREAD_STATE,
			   (thread_state_t) &regs, &count);
  if (kret != KERN_SUCCESS)
    {
      printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
			 kret, thread);
      return;
    }

  switch (regs.tsh.flavor)
    {
    case x86_THREAD_STATE32:
      {
	__uint32_t bit = enable ? X86_EFLAGS_T : 0;

	if (enable && i386_darwin_sstep_at_sigreturn (&regs))
	  return;
	if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit)
	  return;
	regs.uts.ts32.__eflags
	  = (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) | bit;
	kret = thread_set_state (thread, x86_THREAD_STATE,
				 (thread_state_t) &regs, count);
	MACH_CHECK_ERROR (kret);
      }
      break;
#ifdef BFD64
    case x86_THREAD_STATE64:
      {
	__uint64_t bit = enable ? X86_EFLAGS_T : 0;

	if (enable && amd64_darwin_sstep_at_sigreturn (&regs))
	  return;
	if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit)
	  return;
	regs.uts.ts64.__rflags
	  = (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) | bit;
	kret = thread_set_state (thread, x86_THREAD_STATE,
				 (thread_state_t) &regs, count);
	MACH_CHECK_ERROR (kret);
      }
      break;
#endif
    default:
      error (_("darwin_set_sstep: unknown flavour: %d"), regs.tsh.flavor);
    }
}

void
darwin_complete_target (struct target_ops *target)
{
#ifdef BFD64
  amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
  amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs;
  amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset;
  amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs;
#endif

  i386_use_watchpoints (target);

  i386_dr_low.set_control = i386_darwin_dr_set_control;
  i386_dr_low.set_addr = i386_darwin_dr_set_addr;
  i386_dr_low.get_addr = i386_darwin_dr_get_addr;
  i386_dr_low.get_status = i386_darwin_dr_get_status;
  i386_dr_low.get_control = i386_darwin_dr_get_control;

  /* Let's assume that the kernel is 64 bits iff the executable is.  */
#ifdef __x86_64__
  i386_set_debug_register_length (8);
#else
  i386_set_debug_register_length (4);
#endif

  target->to_fetch_registers = i386_darwin_fetch_inferior_registers;
  target->to_store_registers = i386_darwin_store_inferior_registers;
}
Commit	Line	Data
a80b95ba	1	/* Darwin support for GDB, the GNU debugger.
0b1afbb3	2	Copyright (C) 1997-2013 Free Software Foundation, Inc.
a80b95ba TG	3
	4	Contributed by Apple Computer, Inc.
	5
	6	This file is part of GDB.
	7
	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.
	12
	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.
	17
	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/>. */
	20
	21	#include "defs.h"
	22	#include "frame.h"
	23	#include "inferior.h"
	24	#include "target.h"
	25	#include "symfile.h"
	26	#include "symtab.h"
	27	#include "objfiles.h"
	28	#include "gdbcmd.h"
	29	#include "regcache.h"
	30	#include "gdb_assert.h"
	31	#include "i386-tdep.h"
a80b95ba TG	32	#include "i387-tdep.h"
	33	#include "gdbarch.h"
	34	#include "arch-utils.h"
acdb24a9	35	#include "gdbcore.h"
a80b95ba	36
bc884eba	37	#include "i386-nat.h"
a80b95ba TG	38	#include "darwin-nat.h"
	39	#include "i386-darwin-tdep.h"
	40
5cd226f2 TG	41	#ifdef BFD64
5cd226f2 TG	42	#include "amd64-nat.h"
46187dff	43	#include "amd64-tdep.h"
5cd226f2 TG	44	#include "amd64-darwin-tdep.h"
	45	#endif
	46
a80b95ba TG	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
28439f5e PA	51	i386_darwin_fetch_inferior_registers (struct target_ops *ops,
28439f5e PA	52	struct regcache *regcache, int regno)
a80b95ba TG	53	{
	54	thread_t current_thread = ptid_get_tid (inferior_ptid);
	55	int fetched = 0;
	56	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	57
5cd226f2	58	#ifdef BFD64
a80b95ba TG	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	{
1777feb0	72	printf_unfiltered (_("Error calling thread_get_state for "
17092398	73	"GP registers for thread 0x%lx\n"),
016b7430	74	(unsigned long) current_thread);
a80b95ba TG	75	MACH_CHECK_ERROR (ret);
	76	}
	77	amd64_supply_native_gregset (regcache, &gp_regs.uts, -1);
	78	fetched++;
	79	}
	80
	81	if (regno == -1 \|\| !amd64_native_gregset_supplies_p (gdbarch, regno))
	82	{
	83	x86_float_state_t fp_regs;
	84	unsigned int fp_count = x86_FLOAT_STATE_COUNT;
	85	kern_return_t ret;
	86
	87	ret = thread_get_state
	88	(current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
	89	&fp_count);
	90	if (ret != KERN_SUCCESS)
	91	{
1777feb0	92	printf_unfiltered (_("Error calling thread_get_state for "
17092398	93	"float registers for thread 0x%lx\n"),
016b7430	94	(unsigned long) current_thread);
a80b95ba TG	95	MACH_CHECK_ERROR (ret);
a80b95ba TG	96	}
46187dff	97	amd64_supply_fxsave (regcache, -1, &fp_regs.ufs.fs64.__fpu_fcw);
a80b95ba TG	98	fetched++;
	99	}
	100	}
	101	else
5cd226f2	102	#endif
a80b95ba TG	103	{
	104	if (regno == -1 \|\| regno < I386_NUM_GREGS)
	105	{
cf9bb588 TG	106	x86_thread_state32_t gp_regs;
cf9bb588 TG	107	unsigned int gp_count = x86_THREAD_STATE32_COUNT;
a80b95ba TG	108	kern_return_t ret;
	109	int i;
	110
	111	ret = thread_get_state
cf9bb588	112	(current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
a80b95ba TG	113	&gp_count);
	114	if (ret != KERN_SUCCESS)
	115	{
1777feb0	116	printf_unfiltered (_("Error calling thread_get_state for "
17092398 TG	117	"GP registers for thread 0x%lx\n"),
17092398 TG	118	(unsigned long) current_thread);
a80b95ba TG	119	MACH_CHECK_ERROR (ret);
	120	}
	121	for (i = 0; i < I386_NUM_GREGS; i++)
	122	regcache_raw_supply
	123	(regcache, i,
	124	(char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
	125
	126	fetched++;
	127	}
	128
	129	if (regno == -1
	130	\|\| (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
	131	{
cf9bb588 TG	132	x86_float_state32_t fp_regs;
cf9bb588 TG	133	unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
a80b95ba TG	134	kern_return_t ret;
	135
	136	ret = thread_get_state
cf9bb588	137	(current_thread, x86_FLOAT_STATE32, (thread_state_t) &fp_regs,
a80b95ba TG	138	&fp_count);
	139	if (ret != KERN_SUCCESS)
	140	{
1777feb0	141	printf_unfiltered (_("Error calling thread_get_state for "
17092398 TG	142	"float registers for thread 0x%lx\n"),
17092398 TG	143	(unsigned long) current_thread);
a80b95ba TG	144	MACH_CHECK_ERROR (ret);
	145	}
	146	i387_supply_fxsave (regcache, -1, &fp_regs.__fpu_fcw);
	147	fetched++;
	148	}
	149	}
	150
	151	if (! fetched)
	152	{
	153	warning (_("unknown register %d"), regno);
	154	regcache_raw_supply (regcache, regno, NULL);
	155	}
	156	}
	157
	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). */
	161
	162	static void
28439f5e PA	163	i386_darwin_store_inferior_registers (struct target_ops *ops,
28439f5e PA	164	struct regcache *regcache, int regno)
a80b95ba TG	165	{
	166	thread_t current_thread = ptid_get_tid (inferior_ptid);
	167	struct gdbarch *gdbarch = get_regcache_arch (regcache);
	168
5cd226f2	169	#ifdef BFD64
a80b95ba TG	170	if (gdbarch_ptr_bit (gdbarch) == 64)
	171	{
	172	if (regno == -1 \|\| amd64_native_gregset_supplies_p (gdbarch, regno))
	173	{
	174	x86_thread_state_t gp_regs;
	175	kern_return_t ret;
	176	unsigned int gp_count = x86_THREAD_STATE_COUNT;
	177
	178	ret = thread_get_state
	179	(current_thread, x86_THREAD_STATE, (thread_state_t) &gp_regs,
	180	&gp_count);
	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);
	184
	185	amd64_collect_native_gregset (regcache, &gp_regs.uts, regno);
	186
	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);
	191	}
	192
	193	if (regno == -1 \|\| !amd64_native_gregset_supplies_p (gdbarch, regno))
	194	{
	195	x86_float_state_t fp_regs;
	196	kern_return_t ret;
	197	unsigned int fp_count = x86_FLOAT_STATE_COUNT;
	198
	199	ret = thread_get_state
	200	(current_thread, x86_FLOAT_STATE, (thread_state_t) & fp_regs,
	201	&fp_count);
	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);
	205
46187dff	206	amd64_collect_fxsave (regcache, regno, &fp_regs.ufs.fs64.__fpu_fcw);
a80b95ba TG	207
	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);
	212	}
	213	}
	214	else
5cd226f2	215	#endif
a80b95ba TG	216	{
	217	if (regno == -1 \|\| regno < I386_NUM_GREGS)
	218	{
cf9bb588	219	x86_thread_state32_t gp_regs;
a80b95ba	220	kern_return_t ret;
cf9bb588	221	unsigned int gp_count = x86_THREAD_STATE32_COUNT;
a80b95ba TG	222	int i;
	223
	224	ret = thread_get_state
cf9bb588	225	(current_thread, x86_THREAD_STATE32, (thread_state_t) &gp_regs,
a80b95ba TG	226	&gp_count);
	227	MACH_CHECK_ERROR (ret);
	228
	229	for (i = 0; i < I386_NUM_GREGS; i++)
	230	if (regno == -1 \|\| regno == i)
	231	regcache_raw_collect
	232	(regcache, i,
	233	(char *)&gp_regs + i386_darwin_thread_state_reg_offset[i]);
	234
cf9bb588 TG	235	ret = thread_set_state (current_thread, x86_THREAD_STATE32,
	236	(thread_state_t) &gp_regs,
	237	x86_THREAD_STATE32_COUNT);
a80b95ba TG	238	MACH_CHECK_ERROR (ret);
	239	}
	240
	241	if (regno == -1
	242	\|\| (regno >= I386_ST0_REGNUM && regno < I386_SSE_NUM_REGS))
	243	{
cf9bb588 TG	244	x86_float_state32_t fp_regs;
cf9bb588 TG	245	unsigned int fp_count = x86_FLOAT_STATE32_COUNT;
a80b95ba TG	246	kern_return_t ret;
	247
	248	ret = thread_get_state
cf9bb588	249	(current_thread, x86_FLOAT_STATE32, (thread_state_t) & fp_regs,
a80b95ba TG	250	&fp_count);
	251	MACH_CHECK_ERROR (ret);
	252
	253	i387_collect_fxsave (regcache, regno, &fp_regs.__fpu_fcw);
	254
cf9bb588 TG	255	ret = thread_set_state (current_thread, x86_FLOAT_STATE32,
	256	(thread_state_t) &fp_regs,
	257	x86_FLOAT_STATE32_COUNT);
a80b95ba TG	258	MACH_CHECK_ERROR (ret);
	259	}
	260	}
	261	}
	262
a80b95ba TG	263	/* Support for debug registers, boosted mostly from i386-linux-nat.c. */
a80b95ba TG	264
a80b95ba	265	static void
b1328b1b	266	i386_darwin_dr_set (int regnum, CORE_ADDR value)
a80b95ba TG	267	{
	268	int current_pid;
	269	thread_t current_thread;
	270	x86_debug_state_t dr_regs;
	271	kern_return_t ret;
61d82a0d	272	unsigned int dr_count;
a80b95ba TG	273
	274	gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
	275
	276	current_thread = ptid_get_tid (inferior_ptid);
	277
61d82a0d TG	278	dr_regs.dsh.flavor = x86_DEBUG_STATE;
61d82a0d TG	279	dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
a80b95ba	280	dr_count = x86_DEBUG_STATE_COUNT;
61d82a0d	281	ret = thread_get_state (current_thread, x86_DEBUG_STATE,
a80b95ba	282	(thread_state_t) &dr_regs, &dr_count);
b1328b1b	283	MACH_CHECK_ERROR (ret);
a80b95ba	284
61d82a0d	285	switch (dr_regs.dsh.flavor)
a80b95ba	286	{
61d82a0d TG	287	case x86_DEBUG_STATE32:
	288	switch (regnum)
	289	{
	290	case 0:
	291	dr_regs.uds.ds32.__dr0 = value;
	292	break;
	293	case 1:
	294	dr_regs.uds.ds32.__dr1 = value;
	295	break;
	296	case 2:
	297	dr_regs.uds.ds32.__dr2 = value;
	298	break;
	299	case 3:
	300	dr_regs.uds.ds32.__dr3 = value;
	301	break;
	302	case 4:
	303	dr_regs.uds.ds32.__dr4 = value;
	304	break;
	305	case 5:
	306	dr_regs.uds.ds32.__dr5 = value;
	307	break;
	308	case 6:
	309	dr_regs.uds.ds32.__dr6 = value;
	310	break;
	311	case 7:
	312	dr_regs.uds.ds32.__dr7 = value;
	313	break;
	314	}
	315	break;
	316	#ifdef BFD64
	317	case x86_DEBUG_STATE64:
	318	switch (regnum)
	319	{
	320	case 0:
	321	dr_regs.uds.ds64.__dr0 = value;
	322	break;
	323	case 1:
	324	dr_regs.uds.ds64.__dr1 = value;
	325	break;
	326	case 2:
	327	dr_regs.uds.ds64.__dr2 = value;
	328	break;
	329	case 3:
	330	dr_regs.uds.ds64.__dr3 = value;
	331	break;
	332	case 4:
	333	dr_regs.uds.ds64.__dr4 = value;
	334	break;
	335	case 5:
	336	dr_regs.uds.ds64.__dr5 = value;
	337	break;
	338	case 6:
	339	dr_regs.uds.ds64.__dr6 = value;
	340	break;
	341	case 7:
	342	dr_regs.uds.ds64.__dr7 = value;
	343	break;
	344	}
	345	break;
	346	#endif
a80b95ba TG	347	}
a80b95ba TG	348
b1328b1b TG	349	ret = thread_set_state (current_thread, dr_regs.dsh.flavor,
b1328b1b TG	350	(thread_state_t) &dr_regs.uds, dr_count);
a80b95ba	351
b1328b1b	352	MACH_CHECK_ERROR (ret);
a80b95ba TG	353	}
a80b95ba TG	354
b1328b1b	355	static CORE_ADDR
a80b95ba TG	356	i386_darwin_dr_get (int regnum)
	357	{
	358	thread_t current_thread;
	359	x86_debug_state_t dr_regs;
	360	kern_return_t ret;
61d82a0d	361	unsigned int dr_count;
a80b95ba TG	362
	363	gdb_assert (regnum >= 0 && regnum <= DR_CONTROL);
	364
	365	current_thread = ptid_get_tid (inferior_ptid);
	366
61d82a0d TG	367	dr_regs.dsh.flavor = x86_DEBUG_STATE;
61d82a0d TG	368	dr_regs.dsh.count = x86_DEBUG_STATE_COUNT;
a80b95ba	369	dr_count = x86_DEBUG_STATE_COUNT;
61d82a0d	370	ret = thread_get_state (current_thread, x86_DEBUG_STATE,
a80b95ba	371	(thread_state_t) &dr_regs, &dr_count);
b1328b1b	372	MACH_CHECK_ERROR (ret);
a80b95ba	373
61d82a0d	374	switch (dr_regs.dsh.flavor)
a80b95ba	375	{
61d82a0d TG	376	case x86_DEBUG_STATE32:
	377	switch (regnum)
	378	{
	379	case 0:
	380	return dr_regs.uds.ds32.__dr0;
	381	case 1:
	382	return dr_regs.uds.ds32.__dr1;
	383	case 2:
	384	return dr_regs.uds.ds32.__dr2;
	385	case 3:
	386	return dr_regs.uds.ds32.__dr3;
	387	case 4:
	388	return dr_regs.uds.ds32.__dr4;
	389	case 5:
	390	return dr_regs.uds.ds32.__dr5;
	391	case 6:
	392	return dr_regs.uds.ds32.__dr6;
	393	case 7:
	394	return dr_regs.uds.ds32.__dr7;
	395	default:
	396	return -1;
	397	}
	398	break;
	399	#ifdef BFD64
	400	case x86_DEBUG_STATE64:
	401	switch (regnum)
	402	{
	403	case 0:
	404	return dr_regs.uds.ds64.__dr0;
	405	case 1:
	406	return dr_regs.uds.ds64.__dr1;
	407	case 2:
	408	return dr_regs.uds.ds64.__dr2;
	409	case 3:
	410	return dr_regs.uds.ds64.__dr3;
	411	case 4:
	412	return dr_regs.uds.ds64.__dr4;
	413	case 5:
	414	return dr_regs.uds.ds64.__dr5;
	415	case 6:
	416	return dr_regs.uds.ds64.__dr6;
	417	case 7:
	418	return dr_regs.uds.ds64.__dr7;
	419	default:
	420	return -1;
	421	}
	422	break;
	423	#endif
	424	default:
	425	return -1;
a80b95ba TG	426	}
	427	}
	428
61d82a0d	429	static void
a80b95ba TG	430	i386_darwin_dr_set_control (unsigned long control)
	431	{
	432	i386_darwin_dr_set (DR_CONTROL, control);
	433	}
	434
61d82a0d	435	static void
a80b95ba TG	436	i386_darwin_dr_set_addr (int regnum, CORE_ADDR addr)
	437	{
	438	gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
	439
	440	i386_darwin_dr_set (DR_FIRSTADDR + regnum, addr);
	441	}
	442
61d82a0d	443	static CORE_ADDR
7b50312a	444	i386_darwin_dr_get_addr (int regnum)
a80b95ba	445	{
7b50312a	446	return i386_darwin_dr_get (regnum);
a80b95ba TG	447	}
a80b95ba TG	448
61d82a0d	449	static unsigned long
a80b95ba TG	450	i386_darwin_dr_get_status (void)
	451	{
	452	return i386_darwin_dr_get (DR_STATUS);
	453	}
	454
61d82a0d	455	static unsigned long
7b50312a PA	456	i386_darwin_dr_get_control (void)
	457	{
	458	return i386_darwin_dr_get (DR_CONTROL);
	459	}
	460
a80b95ba TG	461	void
	462	darwin_check_osabi (darwin_inferior *inf, thread_t thread)
	463	{
f5656ead	464	if (gdbarch_osabi (target_gdbarch ()) == GDB_OSABI_UNKNOWN)
a80b95ba TG	465	{
	466	/* Attaching to a process. Let's figure out what kind it is. */
	467	x86_thread_state_t gp_regs;
	468	struct gdbarch_info info;
	469	unsigned int gp_count = x86_THREAD_STATE_COUNT;
	470	kern_return_t ret;
	471
	472	ret = thread_get_state (thread, x86_THREAD_STATE,
	473	(thread_state_t) &gp_regs, &gp_count);
	474	if (ret != KERN_SUCCESS)
	475	{
	476	MACH_CHECK_ERROR (ret);
	477	return;
	478	}
	479
	480	gdbarch_info_init (&info);
	481	gdbarch_info_fill (&info);
f5656ead	482	info.byte_order = gdbarch_byte_order (target_gdbarch ());
a80b95ba TG	483	info.osabi = GDB_OSABI_DARWIN;
	484	if (gp_regs.tsh.flavor == x86_THREAD_STATE64)
	485	info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
	486	bfd_mach_x86_64);
	487	else
61d82a0d	488	info.bfd_arch_info = bfd_lookup_arch (bfd_arch_i386,
a80b95ba TG	489	bfd_mach_i386_i386);
	490	gdbarch_update_p (info);
	491	}
	492	}
	493
	494	#define X86_EFLAGS_T 0x100UL
	495
acdb24a9 TG	496	/* Returning from a signal trampoline is done by calling a
	497	special system call (sigreturn). This system call
	498	restores the registers that were saved when the signal was
	499	raised, including %eflags/%rflags. That means that single-stepping
	500	won't work. Instead, we'll have to modify the signal context
	501	that's about to be restored, and set the trace flag there. */
	502
	503	static int
	504	i386_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
	505	{
f5656ead	506	enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
acdb24a9 TG	507	static const gdb_byte darwin_syscall[] = { 0xcd, 0x80 }; /* int 0x80 */
	508	gdb_byte buf[sizeof (darwin_syscall)];
	509
	510	/* Check if PC is at a sigreturn system call. */
	511	if (target_read_memory (regs->uts.ts32.__eip, buf, sizeof (buf)) == 0
	512	&& memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
	513	&& regs->uts.ts32.__eax == 0xb8 /* SYS_sigreturn */)
	514	{
	515	ULONGEST uctx_addr;
	516	ULONGEST mctx_addr;
	517	ULONGEST flags_addr;
	518	unsigned int eflags;
	519
e17a4113 UW	520	uctx_addr = read_memory_unsigned_integer
	521	(regs->uts.ts32.__esp + 4, 4, byte_order);
	522	mctx_addr = read_memory_unsigned_integer
	523	(uctx_addr + 28, 4, byte_order);
acdb24a9 TG	524
	525	flags_addr = mctx_addr + 12 + 9 * 4;
	526	read_memory (flags_addr, (gdb_byte *) &eflags, 4);
	527	eflags \|= X86_EFLAGS_T;
	528	write_memory (flags_addr, (gdb_byte *) &eflags, 4);
	529
	530	return 1;
	531	}
	532	return 0;
	533	}
	534
5cd226f2	535	#ifdef BFD64
acdb24a9 TG	536	static int
	537	amd64_darwin_sstep_at_sigreturn (x86_thread_state_t *regs)
	538	{
f5656ead	539	enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
acdb24a9 TG	540	static const gdb_byte darwin_syscall[] = { 0x0f, 0x05 }; /* syscall */
	541	gdb_byte buf[sizeof (darwin_syscall)];
	542
	543	/* Check if PC is at a sigreturn system call. */
	544	if (target_read_memory (regs->uts.ts64.__rip, buf, sizeof (buf)) == 0
	545	&& memcmp (buf, darwin_syscall, sizeof (darwin_syscall)) == 0
	546	&& (regs->uts.ts64.__rax & 0xffffffff) == 0x20000b8 /* SYS_sigreturn */)
	547	{
	548	ULONGEST mctx_addr;
	549	ULONGEST flags_addr;
	550	unsigned int rflags;
	551
e17a4113 UW	552	mctx_addr = read_memory_unsigned_integer
e17a4113 UW	553	(regs->uts.ts64.__rdi + 48, 8, byte_order);
acdb24a9 TG	554	flags_addr = mctx_addr + 16 + 17 * 8;
	555
	556	/* AMD64 is little endian. */
	557	read_memory (flags_addr, (gdb_byte *) &rflags, 4);
	558	rflags \|= X86_EFLAGS_T;
	559	write_memory (flags_addr, (gdb_byte *) &rflags, 4);
	560
	561	return 1;
	562	}
	563	return 0;
	564	}
5cd226f2	565	#endif
acdb24a9	566
a80b95ba TG	567	void
	568	darwin_set_sstep (thread_t thread, int enable)
	569	{
	570	x86_thread_state_t regs;
	571	unsigned int count = x86_THREAD_STATE_COUNT;
	572	kern_return_t kret;
	573
	574	kret = thread_get_state (thread, x86_THREAD_STATE,
	575	(thread_state_t) &regs, &count);
	576	if (kret != KERN_SUCCESS)
	577	{
	578	printf_unfiltered (_("darwin_set_sstep: error %x, thread=%x\n"),
	579	kret, thread);
	580	return;
	581	}
acdb24a9	582
a80b95ba TG	583	switch (regs.tsh.flavor)
	584	{
	585	case x86_THREAD_STATE32:
	586	{
	587	__uint32_t bit = enable ? X86_EFLAGS_T : 0;
b1328b1b	588
acdb24a9 TG	589	if (enable && i386_darwin_sstep_at_sigreturn (&regs))
acdb24a9 TG	590	return;
a80b95ba TG	591	if ((regs.uts.ts32.__eflags & X86_EFLAGS_T) == bit)
a80b95ba TG	592	return;
1777feb0 MS	593	regs.uts.ts32.__eflags
1777feb0 MS	594	= (regs.uts.ts32.__eflags & ~X86_EFLAGS_T) \| bit;
b1328b1b	595	kret = thread_set_state (thread, x86_THREAD_STATE,
a80b95ba TG	596	(thread_state_t) &regs, count);
	597	MACH_CHECK_ERROR (kret);
	598	}
	599	break;
5cd226f2	600	#ifdef BFD64
a80b95ba TG	601	case x86_THREAD_STATE64:
	602	{
	603	__uint64_t bit = enable ? X86_EFLAGS_T : 0;
	604
acdb24a9 TG	605	if (enable && amd64_darwin_sstep_at_sigreturn (&regs))
acdb24a9 TG	606	return;
a80b95ba TG	607	if ((regs.uts.ts64.__rflags & X86_EFLAGS_T) == bit)
a80b95ba TG	608	return;
1777feb0 MS	609	regs.uts.ts64.__rflags
1777feb0 MS	610	= (regs.uts.ts64.__rflags & ~X86_EFLAGS_T) \| bit;
b1328b1b	611	kret = thread_set_state (thread, x86_THREAD_STATE,
a80b95ba TG	612	(thread_state_t) &regs, count);
	613	MACH_CHECK_ERROR (kret);
	614	}
	615	break;
5cd226f2	616	#endif
a80b95ba	617	default:
b37520b6	618	error (_("darwin_set_sstep: unknown flavour: %d"), regs.tsh.flavor);
a80b95ba TG	619	}
	620	}
	621
	622	void
	623	darwin_complete_target (struct target_ops *target)
	624	{
5cd226f2	625	#ifdef BFD64
a80b95ba TG	626	amd64_native_gregset64_reg_offset = amd64_darwin_thread_state_reg_offset;
	627	amd64_native_gregset64_num_regs = amd64_darwin_thread_state_num_regs;
	628	amd64_native_gregset32_reg_offset = i386_darwin_thread_state_reg_offset;
	629	amd64_native_gregset32_num_regs = i386_darwin_thread_state_num_regs;
5cd226f2	630	#endif
a80b95ba	631
61d82a0d TG	632	i386_use_watchpoints (target);
	633
	634	i386_dr_low.set_control = i386_darwin_dr_set_control;
	635	i386_dr_low.set_addr = i386_darwin_dr_set_addr;
	636	i386_dr_low.get_addr = i386_darwin_dr_get_addr;
	637	i386_dr_low.get_status = i386_darwin_dr_get_status;
	638	i386_dr_low.get_control = i386_darwin_dr_get_control;
	639
	640	/* Let's assume that the kernel is 64 bits iff the executable is. */
	641	#ifdef __x86_64__
	642	i386_set_debug_register_length (8);
	643	#else
	644	i386_set_debug_register_length (4);
	645	#endif
	646
a80b95ba TG	647	target->to_fetch_registers = i386_darwin_fetch_inferior_registers;
	648	target->to_store_registers = i386_darwin_store_inferior_registers;
	649	}