gdb/amd64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/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 "regcache.h"
  27 #include "osabi.h"
  28
  29 #include "gdb_string.h"
  30
  31 #include "amd64-tdep.h"
  32 #include "solib-svr4.h"
  33
  34 /* Support for signal handlers.  */
  35
  36 /* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
  37    routine, return the address of the associated sigcontext structure.  */
  38
  39 static CORE_ADDR
  40 amd64fbsd_sigcontext_addr (struct frame_info *next_frame)
  41 {
  42   CORE_ADDR sp;
  43
  44   /* The `struct sigcontext' (which really is an `ucontext_t' on
  45      FreeBSD/amd64) lives at a fixed offset in the signal frame.  See
  46      <machine/sigframe.h>.  */
  47   sp = frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
  48   return sp + 16;
  49 }
  50 \f
  51 /* FreeBSD 5.1-RELEASE or later.  */
  52
  53 /* Mapping between the general-purpose registers in `struct reg'
  54    format and GDB's register cache layout.
  55
  56    Note that some registers are 32-bit, but since we're little-endian
  57    we get away with that.  */
  58
  59 /* From <machine/reg.h>.  */
  60 static int amd64fbsd_r_reg_offset[] =
  61 {
  62   14 * 8,                       /* %rax */
  63   11 * 8,                       /* %rbx */
  64   13 * 8,                       /* %rcx */
  65   12 * 8,                       /* %rdx */
  66   9 * 8,                        /* %rsi */
  67   8 * 8,                        /* %rdi */
  68   10 * 8,                       /* %rbp */
  69   20 * 8,                       /* %rsp */
  70   7 * 8,                        /* %r8 ... */
  71   6 * 8,
  72   5 * 8,
  73   4 * 8,
  74   3 * 8,
  75   2 * 8,
  76   1 * 8,
  77   0 * 8,                        /* ... %r15 */
  78   17 * 8,                       /* %rip */
  79   19 * 8,                       /* %eflags */
  80   18 * 8,                       /* %cs */
  81   21 * 8,                       /* %ss */
  82   -1,                           /* %ds */
  83   -1,                           /* %es */
  84   -1,                           /* %fs */
  85   -1                            /* %gs */
  86 };
  87
  88 /* Location of the signal trampoline.  */
  89 CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0;
  90 CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0;
  91
  92 /* From <machine/signal.h>.  */
  93 int amd64fbsd_sc_reg_offset[] =
  94 {
  95   24 + 6 * 8,                   /* %rax */
  96   24 + 7 * 8,                   /* %rbx */
  97   24 + 3 * 8,                   /* %rcx */
  98   24 + 2 * 8,                   /* %rdx */
  99   24 + 1 * 8,                   /* %rsi */
 100   24 + 0 * 8,                   /* %rdi */
 101   24 + 8 * 8,                   /* %rbp */
 102   24 + 22 * 8,                  /* %rsp */
 103   24 + 4 * 8,                   /* %r8 ... */
 104   24 + 5 * 8,
 105   24 + 9 * 8,
 106   24 + 10 * 8,
 107   24 + 11 * 8,
 108   24 + 12 * 8,
 109   24 + 13 * 8,
 110   24 + 14 * 8,                  /* ... %r15 */
 111   24 + 19 * 8,                  /* %rip */
 112   24 + 21 * 8,                  /* %eflags */
 113   24 + 20 * 8,                  /* %cs */
 114   24 + 23 * 8,                  /* %ss */
 115   -1,                           /* %ds */
 116   -1,                           /* %es */
 117   -1,                           /* %fs */
 118   -1                            /* %gs */
 119 };
 120
 121 void
 122 amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 123 {
 124   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 125
 126   /* Obviously FreeBSD is BSD-based.  */
 127   i386bsd_init_abi (info, gdbarch);
 128
 129   tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
 130   tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
 131   tdep->sizeof_gregset = 22 * 8;
 132
 133   amd64_init_abi (info, gdbarch);
 134
 135   tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
 136   tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
 137   tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
 138   tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
 139   tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
 140
 141   /* FreeBSD uses SVR4-style shared libraries.  */
 142   set_solib_svr4_fetch_link_map_offsets
 143     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 144 }
 145 \f
 146
 147 /* Provide a prototype to silence -Wmissing-prototypes.  */
 148 void _initialize_amd64fbsd_tdep (void);
 149
 150 void
 151 _initialize_amd64fbsd_tdep (void)
 152 {
 153   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 154                           GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
 155 }