gdb/amd64nbsd-tdep.c

   1 /* Target-dependent code for NetBSD/amd64.
   2
   3    Copyright 2003, 2004 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24 #include "frame.h"
  25 #include "gdbcore.h"
  26 #include "osabi.h"
  27
  28 #include "gdb_assert.h"
  29
  30 #include "nbsd-tdep.h"
  31 #include "x86-64-tdep.h"
  32
  33 /* Support for signal handlers.  */
  34
  35 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
  36    routine, return the address of the associated sigcontext structure.  */
  37
  38 static CORE_ADDR
  39 amd64nbsd_sigcontext_addr (struct frame_info *next_frame)
  40 {
  41   CORE_ADDR sp;
  42
  43   /* The stack pointer points at `struct sigcontext' upon entry of a
  44      signal trampoline.  */
  45   sp = frame_unwind_register_unsigned (next_frame, X86_64_RSP_REGNUM);
  46   return sp;
  47 }
  48 \f
  49 /* NetBSD 2.0 or later.  */
  50
  51 /* Mapping between the general-purpose registers in `struct reg'
  52    format and GDB's register cache layout.  */
  53
  54 /* From <machine/reg.h>.  */
  55 int amd64nbsd_r_reg_offset[] =
  56 {
  57   14 * 8,                       /* %rax */
  58   13 * 8,                       /* %rbx */
  59   3 * 8,                        /* %rcx */
  60   2 * 8,                        /* %rdx */
  61   1 * 8,                        /* %rsi */
  62   0 * 8,                        /* %rdi */
  63   12 * 8,                       /* %rbp */
  64   24 * 8,                       /* %rsp */
  65   4 * 8,                        /* %r8 .. */
  66   5 * 8,
  67   6 * 8,
  68   7 * 8,
  69   8 * 8,
  70   9 * 8,
  71   10 * 8,
  72   11 * 8,                       /* ... %r15 */
  73   21 * 8,                       /* %rip */
  74   23 * 8,                       /* %eflags */
  75   22 * 8,                       /* %cs */
  76   25 * 8,                       /* %ss */
  77   18 * 8,                       /* %ds */
  78   17 * 8,                       /* %es */
  79   16 * 8,                       /* %fs */
  80   15 * 8                        /* %gs */
  81 };
  82
  83 static void
  84 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  85 {
  86   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  87   int *sc_reg_offset;
  88   int i;
  89
  90   /* Initialize general-purpose register set details first.  */
  91   tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
  92   tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
  93   tdep->sizeof_gregset = 26 * 8;
  94
  95   x86_64_init_abi (info, gdbarch);
  96
  97   tdep->jb_pc_offset = 7 * 8;
  98
  99   /* NetBSD has its own convention for signal trampolines.  */
 100   set_gdbarch_pc_in_sigtramp (gdbarch, nbsd_pc_in_sigtramp);
 101
 102   /* Initialize the array with register offsets in `struct
 103      sigcontext'.  This `struct sigcontext' has an sc_mcontext member
 104      at offset 32, and in <machine/reg.h> we have an explicit comment
 105      saying that `struct reg' is the same as mcontext.__gregs.  */
 106   tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 107   tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int);
 108   for (i = 0; i < tdep->sc_num_regs; i++)
 109     {
 110       if (amd64nbsd_r_reg_offset[i] < 0)
 111         tdep->sc_reg_offset[i] = -1;
 112       else
 113         tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i];
 114     }
 115
 116   tdep->sigcontext_addr = amd64nbsd_sigcontext_addr;
 117 }
 118 \f
 119
 120 /* Provide a prototype to silence -Wmissing-prototypes.  */
 121 void _initialize_amd64nbsd_tdep (void);
 122
 123 void
 124 _initialize_amd64nbsd_ndep (void)
 125 {
 126   /* The NetBSD/amd64 native dependent code makes this assumption.  */
 127   gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == X86_64_NUM_GREGS);
 128
 129   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 130                           GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
 131 }