darling-gdb/gdb/amd64-darwin-tdep.c

/* Darwin support for GDB, the GNU debugger.
   Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009, 2010, 2011
   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 "gdbcore.h"
#include "target.h"
#include "floatformat.h"
#include "symtab.h"
#include "regcache.h"
#include "libbfd.h"
#include "objfiles.h"

#include "i387-tdep.h"
#include "amd64-tdep.h"
#include "osabi.h"
#include "ui-out.h"
#include "symtab.h"
#include "frame.h"
#include "gdb_assert.h"
#include "amd64-darwin-tdep.h"
#include "i386-darwin-tdep.h"
#include "solib.h"
#include "solib-darwin.h"
#include "dwarf2-frame.h"

/* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
   From <mach/i386/thread_status.h> and amd64-tdep.h.  */
int amd64_darwin_thread_state_reg_offset[] =
{
  0 * 8,			/* %rax */
  1 * 8,			/* %rbx */
  2 * 8,			/* %rcx */
  3 * 8,			/* %rdx */
  5 * 8,			/* %rsi */
  4 * 8,			/* %rdi */
  6 * 8,			/* %rbp */
  7 * 8,			/* %rsp */
  8 * 8,			/* %r8 ... */
  9 * 8,
  10 * 8,
  11 * 8,
  12 * 8,
  13 * 8,
  14 * 8,
  15 * 8,			/* ... %r15 */
  16 * 8,			/* %rip */
  17 * 8,			/* %rflags */
  18 * 8,			/* %cs */
  -1,				/* %ss */
  -1,				/* %ds */
  -1,				/* %es */
  19 * 8,			/* %fs */
  20 * 8			/* %gs */
};

const int amd64_darwin_thread_state_num_regs = 
  ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);

/* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
   address of the associated sigcontext structure.  */

static CORE_ADDR
amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR rbx;
  CORE_ADDR si;
  gdb_byte buf[8];

  /* A pointer to the ucontext is passed as the fourth argument
     to the signal handler, which is saved in rbx.  */
  get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
  rbx = extract_unsigned_integer (buf, 8, byte_order);

  /* The pointer to mcontext is at offset 48.  */
  read_memory (rbx + 48, buf, 8);

  /* First register (rax) is at offset 16.  */
  return extract_unsigned_integer (buf, 8, byte_order) + 16;
}

static void
x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  amd64_init_abi (info, gdbarch);

  tdep->struct_return = reg_struct_return;

  dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);

  tdep->sigtramp_p = i386_sigtramp_p;
  tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
  tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
  tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;

  tdep->jb_pc_offset = 148;

  set_solib_ops (gdbarch, &darwin_so_ops);
}

void
_initialize_amd64_darwin_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
                          GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
}