gdb/amd64-darwin-tdep.c

   1 /* Darwin support for GDB, the GNU debugger.
   2    Copyright 1997-2002, 2005, 2008-2012 Free Software Foundation, Inc.
   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 "gdbcore.h"
  25 #include "target.h"
  26 #include "floatformat.h"
  27 #include "symtab.h"
  28 #include "regcache.h"
  29 #include "libbfd.h"
  30 #include "objfiles.h"
  31
  32 #include "i387-tdep.h"
  33 #include "amd64-tdep.h"
  34 #include "osabi.h"
  35 #include "ui-out.h"
  36 #include "symtab.h"
  37 #include "frame.h"
  38 #include "gdb_assert.h"
  39 #include "amd64-darwin-tdep.h"
  40 #include "i386-darwin-tdep.h"
  41 #include "solib.h"
  42 #include "solib-darwin.h"
  43 #include "dwarf2-frame.h"
  44
  45 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
  46    From <mach/i386/thread_status.h> and amd64-tdep.h.  */
  47 int amd64_darwin_thread_state_reg_offset[] =
  48 {
  49   0 * 8,                        /* %rax */
  50   1 * 8,                        /* %rbx */
  51   2 * 8,                        /* %rcx */
  52   3 * 8,                        /* %rdx */
  53   5 * 8,                        /* %rsi */
  54   4 * 8,                        /* %rdi */
  55   6 * 8,                        /* %rbp */
  56   7 * 8,                        /* %rsp */
  57   8 * 8,                        /* %r8 ...  */
  58   9 * 8,
  59   10 * 8,
  60   11 * 8,
  61   12 * 8,
  62   13 * 8,
  63   14 * 8,
  64   15 * 8,                       /* ... %r15 */
  65   16 * 8,                       /* %rip */
  66   17 * 8,                       /* %rflags */
  67   18 * 8,                       /* %cs */
  68   -1,                           /* %ss */
  69   -1,                           /* %ds */
  70   -1,                           /* %es */
  71   19 * 8,                       /* %fs */
  72   20 * 8                        /* %gs */
  73 };
  74
  75 const int amd64_darwin_thread_state_num_regs =
  76   ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
  77
  78 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
  79    address of the associated sigcontext structure.  */
  80
  81 static CORE_ADDR
  82 amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
  83 {
  84   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  85   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  86   CORE_ADDR rbx;
  87   CORE_ADDR si;
  88   gdb_byte buf[8];
  89
  90   /* A pointer to the ucontext is passed as the fourth argument
  91      to the signal handler, which is saved in rbx.  */
  92   get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
  93   rbx = extract_unsigned_integer (buf, 8, byte_order);
  94
  95   /* The pointer to mcontext is at offset 48.  */
  96   read_memory (rbx + 48, buf, 8);
  97
  98   /* First register (rax) is at offset 16.  */
  99   return extract_unsigned_integer (buf, 8, byte_order) + 16;
 100 }
 101
 102 static void
 103 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
 104 {
 105   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 106
 107   amd64_init_abi (info, gdbarch);
 108
 109   tdep->struct_return = reg_struct_return;
 110
 111   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 112
 113   tdep->sigtramp_p = i386_sigtramp_p;
 114   tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
 115   tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
 116   tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
 117
 118   tdep->jb_pc_offset = 56;
 119
 120   set_solib_ops (gdbarch, &darwin_so_ops);
 121 }
 122
 123 void
 124 _initialize_amd64_darwin_tdep (void)
 125 {
 126   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 127                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
 128 }