gdb/amd64-darwin-tdep.c

   1 /* Darwin support for GDB, the GNU debugger.
   2    Copyright (C) 1997-2020 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 "symtab.h"
  27 #include "regcache.h"
  28 #include "objfiles.h"
  29
  30 #include "i387-tdep.h"
  31 #include "gdbsupport/x86-xstate.h"
  32 #include "amd64-tdep.h"
  33 #include "osabi.h"
  34 #include "ui-out.h"
  35 #include "amd64-darwin-tdep.h"
  36 #include "i386-darwin-tdep.h"
  37 #include "solib.h"
  38 #include "solib-darwin.h"
  39 #include "dwarf2/frame.h"
  40
  41 /* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
  42    From <mach/i386/thread_status.h> and amd64-tdep.h.  */
  43 int amd64_darwin_thread_state_reg_offset[] =
  44 {
  45   0 * 8,                        /* %rax */
  46   1 * 8,                        /* %rbx */
  47   2 * 8,                        /* %rcx */
  48   3 * 8,                        /* %rdx */
  49   5 * 8,                        /* %rsi */
  50   4 * 8,                        /* %rdi */
  51   6 * 8,                        /* %rbp */
  52   7 * 8,                        /* %rsp */
  53   8 * 8,                        /* %r8 ...  */
  54   9 * 8,
  55   10 * 8,
  56   11 * 8,
  57   12 * 8,
  58   13 * 8,
  59   14 * 8,
  60   15 * 8,                       /* ... %r15 */
  61   16 * 8,                       /* %rip */
  62   17 * 8,                       /* %rflags */
  63   18 * 8,                       /* %cs */
  64   -1,                           /* %ss */
  65   -1,                           /* %ds */
  66   -1,                           /* %es */
  67   19 * 8,                       /* %fs */
  68   20 * 8                        /* %gs */
  69 };
  70
  71 const int amd64_darwin_thread_state_num_regs =
  72   ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
  73
  74 /* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
  75    address of the associated sigcontext structure.  */
  76
  77 static CORE_ADDR
  78 amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
  79 {
  80   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  81   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  82   CORE_ADDR rbx;
  83   gdb_byte buf[8];
  84
  85   /* A pointer to the ucontext is passed as the fourth argument
  86      to the signal handler, which is saved in rbx.  */
  87   get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
  88   rbx = extract_unsigned_integer (buf, 8, byte_order);
  89
  90   /* The pointer to mcontext is at offset 48.  */
  91   read_memory (rbx + 48, buf, 8);
  92
  93   /* First register (rax) is at offset 16.  */
  94   return extract_unsigned_integer (buf, 8, byte_order) + 16;
  95 }
  96
  97 static void
  98 x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
  99 {
 100   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 101
 102   amd64_init_abi (info, gdbarch,
 103                   amd64_target_description (X86_XSTATE_SSE_MASK, true));
 104
 105   tdep->struct_return = reg_struct_return;
 106
 107   dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
 108
 109   tdep->sigtramp_p = i386_sigtramp_p;
 110   tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
 111   tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
 112   tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
 113
 114   tdep->jb_pc_offset = 56;
 115
 116   set_solib_ops (gdbarch, &darwin_so_ops);
 117 }
 118
 119 void _initialize_amd64_darwin_tdep ();
 120 void
 121 _initialize_amd64_darwin_tdep ()
 122 {
 123   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 124                           GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
 125 }