gdb/amd64-darwin-tdep.c

   1 /* Darwin support for GDB, the GNU debugger.
   2    Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4
   5    Contributed by Apple Computer, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "inferior.h"
  25 #include "gdbcore.h"
  26 #include "target.h"
  27 #include "floatformat.h"
  28 #include "symtab.h"
  29 #include "regcache.h"
  30 #include "libbfd.h"
  31 #include "objfiles.h"
  32
  33 #include "i387-tdep.h"
  34 #include "amd64-tdep.h"
  35 #include "osabi.h"
  36 #include "ui-out.h"
  37 #include "symtab.h"
  38 #include "frame.h"
  39 #include "gdb_assert.h"
  40 #include "amd64-darwin-tdep.h"
  41 #include "i386-darwin-tdep.h"
  42 #include "solib.h"
  43 #include "solib-darwin.h"
  44 #include "dwarf2-frame.h"
  45
  46 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
  47    From <mach/i386/thread_status.h> and amd64-tdep.h.  */
  48 int amd64_darwin_thread_state_reg_offset[] =
  49 {
  50   0 * 8,                        /* %rax */
  51   1 * 8,                        /* %rbx */
  52   2 * 8,                        /* %rcx */
  53   3 * 8,                        /* %rdx */
  54   5 * 8,                        /* %rsi */
  55   4 * 8,                        /* %rdi */
  56   6 * 8,                        /* %rbp */
  57   7 * 8,                        /* %rsp */
  58   8 * 8,                        /* %r8 ...  */
  59   9 * 8,
  60   10 * 8,
  61   11 * 8,
  62   12 * 8,
  63   13 * 8,
  64   14 * 8,
  65   15 * 8,                       /* ... %r15 */
  66   16 * 8,                       /* %rip */
  67   17 * 8,                       /* %rflags */
  68   18 * 8,                       /* %cs */
  69   -1,                           /* %ss */
  70   -1,                           /* %ds */
  71   -1,                           /* %es */
  72   19 * 8,                       /* %fs */
  73   20 * 8                        /* %gs */
  74 };
  75
  76 const int amd64_darwin_thread_state_num_regs =
  77   ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
  78
  79 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
  80    address of the associated sigcontext structure.  */
  81
  82 static CORE_ADDR
  83 amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
  84 {
  85   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  86   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  87   CORE_ADDR rbx;
  88   CORE_ADDR si;
  89   gdb_byte buf[8];
  90
  91   /* A pointer to the ucontext is passed as the fourth argument
  92      to the signal handler, which is saved in rbx.  */
  93   get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
  94   rbx = extract_unsigned_integer (buf, 8, byte_order);
  95
  96   /* The pointer to mcontext is at offset 48.  */
  97   read_memory (rbx + 48, buf, 8);
  98
  99   /* First register (rax) is at offset 16.  */
 100   return extract_unsigned_integer (buf, 8, byte_order) + 16;
 101 }
 102
 103 static void
 104 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
 105 {
 106   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 107
 108   amd64_init_abi (info, gdbarch);
 109
 110   tdep->struct_return = reg_struct_return;
 111
 112   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 113
 114   tdep->sigtramp_p = i386_sigtramp_p;
 115   tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
 116   tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
 117   tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
 118
 119   tdep->jb_pc_offset = 148;
 120
 121   set_solib_ops (gdbarch, &darwin_so_ops);
 122 }
 123
 124 void
 125 _initialize_amd64_darwin_tdep (void)
 126 {
 127   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 128                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
 129 }