text: /* Darwin support for GDB, the GNU debugger.
     Copyright (C) 1997-2020 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 "symtab.h"
  #include "regcache.h"
  #include "objfiles.h"
  
  #include "i387-tdep.h"
  #include "gdbsupport/x86-xstate.h"
  #include "amd64-tdep.h"
  #include "osabi.h"
  #include "ui-out.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;
    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,
  		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
  
    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 = 56;
  
    set_solib_ops (gdbarch, &darwin_so_ops);
  }
  
  void _initialize_amd64_darwin_tdep ();
  void
  _initialize_amd64_darwin_tdep ()
  {
    gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
                            GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
  }
  