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 #include "symtab.h"
  28
  29 #include "gdb_assert.h"
  30
  31 #include "amd64-tdep.h"
  32 #include "nbsd-tdep.h"
  33 #include "solib-svr4.h"
  34
  35 /* Support for signal handlers.  */
  36
  37 /* Return whether the frame preciding NEXT_FRAME corresponds to a
  38    NetBSD sigtramp routine.  */
  39
  40 static int
  41 amd64nbsd_sigtramp_p (struct frame_info *next_frame)
  42 {
  43   CORE_ADDR pc = frame_pc_unwind (next_frame);
  44   char *name;
  45
  46   find_pc_partial_function (pc, &name, NULL, NULL);
  47   return nbsd_pc_in_sigtramp (pc, name);
  48 }
  49
  50 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
  51    routine, return the address of the associated sigcontext structure.  */
  52
  53 static CORE_ADDR
  54 amd64nbsd_sigcontext_addr (struct frame_info *next_frame)
  55 {
  56   CORE_ADDR sp;
  57
  58   /* The stack pointer points at `struct sigcontext' upon entry of a
  59      signal trampoline.  */
  60   sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
  61   return sp;
  62 }
  63 \f
  64 /* NetBSD 2.0 or later.  */
  65
  66 /* Mapping between the general-purpose registers in `struct reg'
  67    format and GDB's register cache layout.  */
  68
  69 /* From <machine/reg.h>.  */
  70 int amd64nbsd_r_reg_offset[] =
  71 {
  72   14 * 8,                       /* %rax */
  73   13 * 8,                       /* %rbx */
  74   3 * 8,                        /* %rcx */
  75   2 * 8,                        /* %rdx */
  76   1 * 8,                        /* %rsi */
  77   0 * 8,                        /* %rdi */
  78   12 * 8,                       /* %rbp */
  79   24 * 8,                       /* %rsp */
  80   4 * 8,                        /* %r8 .. */
  81   5 * 8,
  82   6 * 8,
  83   7 * 8,
  84   8 * 8,
  85   9 * 8,
  86   10 * 8,
  87   11 * 8,                       /* ... %r15 */
  88   21 * 8,                       /* %rip */
  89   23 * 8,                       /* %eflags */
  90   22 * 8,                       /* %cs */
  91   25 * 8,                       /* %ss */
  92   18 * 8,                       /* %ds */
  93   17 * 8,                       /* %es */
  94   16 * 8,                       /* %fs */
  95   15 * 8                        /* %gs */
  96 };
  97
  98 static void
  99 amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 100 {
 101   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 102   int *sc_reg_offset;
 103   int i;
 104
 105   /* Initialize general-purpose register set details first.  */
 106   tdep->gregset_reg_offset = amd64nbsd_r_reg_offset;
 107   tdep->gregset_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 108   tdep->sizeof_gregset = 26 * 8;
 109
 110   amd64_init_abi (info, gdbarch);
 111
 112   tdep->jb_pc_offset = 7 * 8;
 113
 114   /* NetBSD has its own convention for signal trampolines.  */
 115   tdep->sigtramp_p = amd64nbsd_sigtramp_p;
 116   tdep->sigcontext_addr = amd64nbsd_sigcontext_addr;
 117
 118   /* Initialize the array with register offsets in `struct
 119      sigcontext'.  This `struct sigcontext' has an sc_mcontext member
 120      at offset 32, and in <machine/reg.h> we have an explicit comment
 121      saying that `struct reg' is the same as mcontext.__gregs.  */
 122   tdep->sc_num_regs = ARRAY_SIZE (amd64nbsd_r_reg_offset);
 123   tdep->sc_reg_offset = XCALLOC (tdep->sc_num_regs, int);
 124   for (i = 0; i < tdep->sc_num_regs; i++)
 125     {
 126       if (amd64nbsd_r_reg_offset[i] < 0)
 127         tdep->sc_reg_offset[i] = -1;
 128       else
 129         tdep->sc_reg_offset[i] = 32 + amd64nbsd_r_reg_offset[i];
 130     }
 131
 132   /* NetBSD uses SVR4-style shared libraries.  */
 133   set_solib_svr4_fetch_link_map_offsets
 134     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 135 }
 136 \f
 137
 138 /* Provide a prototype to silence -Wmissing-prototypes.  */
 139 void _initialize_amd64nbsd_tdep (void);
 140
 141 void
 142 _initialize_amd64nbsd_ndep (void)
 143 {
 144   /* The NetBSD/amd64 native dependent code makes this assumption.  */
 145   gdb_assert (ARRAY_SIZE (amd64nbsd_r_reg_offset) == AMD64_NUM_GREGS);
 146
 147   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 148                           GDB_OSABI_NETBSD_ELF, amd64nbsd_init_abi);
 149 }