gdb/i386-darwin-tdep.c

   1 /* Darwin support for GDB, the GNU debugger.
   2    Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009
   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 "i386-tdep.h"
  35 #include "amd64-tdep.h"
  36 #include "osabi.h"
  37 #include "ui-out.h"
  38 #include "symtab.h"
  39 #include "frame.h"
  40 #include "gdb_assert.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 i386_thread_state where we'll find the saved regs.
  47    From <mach/i386/thread_status.h> and i386-tdep.h.  */
  48 int i386_darwin_thread_state_reg_offset[] =
  49 {
  50    0 * 4,   /* EAX */
  51    2 * 4,   /* ECX */
  52    3 * 4,   /* EDX */
  53    1 * 4,   /* EBX */
  54    7 * 4,   /* ESP */
  55    6 * 4,   /* EBP */
  56    5 * 4,   /* ESI */
  57    4 * 4,   /* EDI */
  58   10 * 4,   /* EIP */
  59    9 * 4,   /* EFLAGS */
  60   11 * 4,   /* CS */
  61    8,       /* SS */
  62   12 * 4,   /* DS */
  63   13 * 4,   /* ES */
  64   14 * 4,   /* FS */
  65   15 * 4    /* GS */
  66 };
  67
  68 const int i386_darwin_thread_state_num_regs =
  69   ARRAY_SIZE (i386_darwin_thread_state_reg_offset);
  70
  71 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
  72    From <mach/i386/thread_status.h> and amd64-tdep.h.  */
  73 int amd64_darwin_thread_state_reg_offset[] =
  74 {
  75   0 * 8,                        /* %rax */
  76   1 * 8,                        /* %rbx */
  77   2 * 8,                        /* %rcx */
  78   3 * 8,                        /* %rdx */
  79   5 * 8,                        /* %rsi */
  80   4 * 8,                        /* %rdi */
  81   6 * 8,                        /* %rbp */
  82   7 * 8,                        /* %rsp */
  83   8 * 8,                        /* %r8 ... */
  84   9 * 8,
  85   10 * 8,
  86   11 * 8,
  87   12 * 8,
  88   13 * 8,
  89   14 * 8,
  90   15 * 8,                       /* ... %r15 */
  91   16 * 8,                       /* %rip */
  92   17 * 8,                       /* %rflags */
  93   18 * 8,                       /* %cs */
  94   -1,                           /* %ss */
  95   -1,                           /* %ds */
  96   -1,                           /* %es */
  97   19 * 8,                       /* %fs */
  98   20 * 8                        /* %gs */
  99 };
 100
 101 const int amd64_darwin_thread_state_num_regs =
 102   ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
 103
 104 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
 105    address of the associated sigcontext structure.  */
 106
 107 static CORE_ADDR
 108 i386_darwin_sigcontext_addr (struct frame_info *this_frame)
 109 {
 110   struct gdbarch *gdbarch = get_frame_arch (this_frame);
 111   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 112   CORE_ADDR bp;
 113   CORE_ADDR si;
 114   gdb_byte buf[4];
 115
 116   get_frame_register (this_frame, I386_EBP_REGNUM, buf);
 117   bp = extract_unsigned_integer (buf, 4, byte_order);
 118
 119   /* A pointer to the ucontext is passed as the fourth argument
 120      to the signal handler.  */
 121   read_memory (bp + 24, buf, 4);
 122   si = extract_unsigned_integer (buf, 4, byte_order);
 123
 124   /* The pointer to mcontext is at offset 28.  */
 125   read_memory (si + 28, buf, 4);
 126
 127   /* First register (eax) is at offset 12.  */
 128   return extract_unsigned_integer (buf, 4, byte_order) + 12;
 129 }
 130
 131 static CORE_ADDR
 132 amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
 133 {
 134   struct gdbarch *gdbarch = get_frame_arch (this_frame);
 135   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 136   CORE_ADDR rbx;
 137   CORE_ADDR si;
 138   gdb_byte buf[8];
 139
 140   /* A pointer to the ucontext is passed as the fourth argument
 141      to the signal handler, which is saved in rbx.  */
 142   get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
 143   rbx = extract_unsigned_integer (buf, 8, byte_order);
 144
 145   /* The pointer to mcontext is at offset 48.  */
 146   read_memory (rbx + 48, buf, 8);
 147
 148   /* First register (rax) is at offset 16.  */
 149   return extract_unsigned_integer (buf, 8, byte_order) + 16;
 150 }
 151
 152 /* Return true if the PC of THIS_FRAME is in a signal trampoline which
 153    may have DWARF-2 CFI.
 154
 155    On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE
 156    that covers only the indirect call to the user handler.
 157    Without this function, the frame is recognized as a normal frame which is
 158    not expected.  */
 159
 160 static int
 161 darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch,
 162                              struct frame_info *this_frame)
 163 {
 164   return i386_sigtramp_p (this_frame);
 165 }
 166
 167 static void
 168 i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 169 {
 170   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 171
 172   /* We support the SSE registers.  */
 173   tdep->num_xmm_regs = I386_NUM_XREGS - 1;
 174   set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
 175
 176   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 177
 178   tdep->struct_return = reg_struct_return;
 179
 180   tdep->sigtramp_p = i386_sigtramp_p;
 181   tdep->sigcontext_addr = i386_darwin_sigcontext_addr;
 182   tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset;
 183   tdep->sc_num_regs = i386_darwin_thread_state_num_regs;
 184
 185   tdep->jb_pc_offset = 20;
 186
 187   set_solib_ops (gdbarch, &darwin_so_ops);
 188 }
 189
 190 static void
 191 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
 192 {
 193   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 194
 195   amd64_init_abi (info, gdbarch);
 196
 197   tdep->struct_return = reg_struct_return;
 198
 199   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 200
 201   tdep->sigtramp_p = i386_sigtramp_p;
 202   tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
 203   tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
 204   tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
 205
 206   tdep->jb_pc_offset = 148;
 207
 208   set_solib_ops (gdbarch, &darwin_so_ops);
 209 }
 210
 211 static enum gdb_osabi
 212 i386_mach_o_osabi_sniffer (bfd *abfd)
 213 {
 214   if (!bfd_check_format (abfd, bfd_object))
 215     return GDB_OSABI_UNKNOWN;
 216
 217   if (bfd_get_arch (abfd) == bfd_arch_i386)
 218     return GDB_OSABI_DARWIN;
 219
 220   return GDB_OSABI_UNKNOWN;
 221 }
 222
 223 void
 224 _initialize_i386_darwin_tdep (void)
 225 {
 226   gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour,
 227                                   i386_mach_o_osabi_sniffer);
 228
 229   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_i386_i386,
 230                           GDB_OSABI_DARWIN, i386_darwin_init_abi);
 231
 232   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 233                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
 234 }