gdb/amd64-darwin-tdep.c

   1 /* Darwin support for GDB, the GNU debugger.
   2    Copyright (C) 1997-2019 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
  23 /* Local non-gdb includes.  */
  24 #include "amd64-darwin-tdep.h"
  25 #include "amd64-tdep.h"
  26 #include "common/x86-xstate.h"
  27 #include "dwarf2-frame.h"
  28 #include "frame.h"
  29 #include "gdbcore.h"
  30 #include "i386-darwin-tdep.h"
  31 #include "i387-tdep.h"
  32 #include "inferior.h"
  33 #include "objfiles.h"
  34 #include "osabi.h"
  35 #include "regcache.h"
  36 #include "solib-darwin.h"
  37 #include "solib.h"
  38 #include "symtab.h"
  39 #include "target.h"
  40 #include "ui-out.h"
  41
  42 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
  43    From <mach/i386/thread_status.h> and amd64-tdep.h.  */
  44 int amd64_darwin_thread_state_reg_offset[] =
  45 {
  46   0 * 8,                        /* %rax */
  47   1 * 8,                        /* %rbx */
  48   2 * 8,                        /* %rcx */
  49   3 * 8,                        /* %rdx */
  50   5 * 8,                        /* %rsi */
  51   4 * 8,                        /* %rdi */
  52   6 * 8,                        /* %rbp */
  53   7 * 8,                        /* %rsp */
  54   8 * 8,                        /* %r8 ...  */
  55   9 * 8,
  56   10 * 8,
  57   11 * 8,
  58   12 * 8,
  59   13 * 8,
  60   14 * 8,
  61   15 * 8,                       /* ... %r15 */
  62   16 * 8,                       /* %rip */
  63   17 * 8,                       /* %rflags */
  64   18 * 8,                       /* %cs */
  65   -1,                           /* %ss */
  66   -1,                           /* %ds */
  67   -1,                           /* %es */
  68   19 * 8,                       /* %fs */
  69   20 * 8                        /* %gs */
  70 };
  71
  72 const int amd64_darwin_thread_state_num_regs =
  73   ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
  74
  75 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
  76    address of the associated sigcontext structure.  */
  77
  78 static CORE_ADDR
  79 amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
  80 {
  81   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  82   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  83   CORE_ADDR rbx;
  84   gdb_byte buf[8];
  85
  86   /* A pointer to the ucontext is passed as the fourth argument
  87      to the signal handler, which is saved in rbx.  */
  88   get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
  89   rbx = extract_unsigned_integer (buf, 8, byte_order);
  90
  91   /* The pointer to mcontext is at offset 48.  */
  92   read_memory (rbx + 48, buf, 8);
  93
  94   /* First register (rax) is at offset 16.  */
  95   return extract_unsigned_integer (buf, 8, byte_order) + 16;
  96 }
  97
  98 static void
  99 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
 100 {
 101   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 102
 103   amd64_init_abi (info, gdbarch,
 104                   amd64_target_description (X86_XSTATE_SSE_MASK, true));
 105
 106   tdep->struct_return = reg_struct_return;
 107
 108   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 109
 110   tdep->sigtramp_p = i386_sigtramp_p;
 111   tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
 112   tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
 113   tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
 114
 115   tdep->jb_pc_offset = 56;
 116
 117   set_solib_ops (gdbarch, &darwin_so_ops);
 118 }
 119
 120 void
 121 _initialize_amd64_darwin_tdep (void)
 122 {
 123   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 124                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
 125 }