gdb/amd64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/amd64.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, 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 "arch-utils.h"
  23 #include "frame.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26 #include "osabi.h"
  27
  28 #include "gdb_assert.h"
  29 #include "gdb_string.h"
  30
  31 #include "amd64-tdep.h"
  32 #include "bsd-uthread.h"
  33 #include "solib-svr4.h"
  34
  35 /* Support for signal handlers.  */
  36
  37 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
  38    address of the associated sigcontext structure.  */
  39
  40 static CORE_ADDR
  41 amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
  42 {
  43   CORE_ADDR sp;
  44
  45   /* The `struct sigcontext' (which really is an `ucontext_t' on
  46      FreeBSD/amd64) lives at a fixed offset in the signal frame.  See
  47      <machine/sigframe.h>.  */
  48   sp = frame_unwind_register_unsigned (this_frame, AMD64_RSP_REGNUM);
  49   return sp + 16;
  50 }
  51 \f
  52 /* FreeBSD 5.1-RELEASE or later.  */
  53
  54 /* Mapping between the general-purpose registers in `struct reg'
  55    format and GDB's register cache layout.
  56
  57    Note that some registers are 32-bit, but since we're little-endian
  58    we get away with that.  */
  59
  60 /* From <machine/reg.h>.  */
  61 static int amd64fbsd_r_reg_offset[] =
  62 {
  63   14 * 8,                       /* %rax */
  64   11 * 8,                       /* %rbx */
  65   13 * 8,                       /* %rcx */
  66   12 * 8,                       /* %rdx */
  67   9 * 8,                        /* %rsi */
  68   8 * 8,                        /* %rdi */
  69   10 * 8,                       /* %rbp */
  70   20 * 8,                       /* %rsp */
  71   7 * 8,                        /* %r8 ...  */
  72   6 * 8,
  73   5 * 8,
  74   4 * 8,
  75   3 * 8,
  76   2 * 8,
  77   1 * 8,
  78   0 * 8,                        /* ... %r15 */
  79   17 * 8,                       /* %rip */
  80   19 * 8,                       /* %eflags */
  81   18 * 8,                       /* %cs */
  82   21 * 8,                       /* %ss */
  83   -1,                           /* %ds */
  84   -1,                           /* %es */
  85   -1,                           /* %fs */
  86   -1                            /* %gs */
  87 };
  88
  89 /* Location of the signal trampoline.  */
  90 CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0ULL;
  91 CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0ULL;
  92
  93 /* From <machine/signal.h>.  */
  94 int amd64fbsd_sc_reg_offset[] =
  95 {
  96   24 + 6 * 8,                   /* %rax */
  97   24 + 7 * 8,                   /* %rbx */
  98   24 + 3 * 8,                   /* %rcx */
  99   24 + 2 * 8,                   /* %rdx */
 100   24 + 1 * 8,                   /* %rsi */
 101   24 + 0 * 8,                   /* %rdi */
 102   24 + 8 * 8,                   /* %rbp */
 103   24 + 22 * 8,                  /* %rsp */
 104   24 + 4 * 8,                   /* %r8 ...  */
 105   24 + 5 * 8,
 106   24 + 9 * 8,
 107   24 + 10 * 8,
 108   24 + 11 * 8,
 109   24 + 12 * 8,
 110   24 + 13 * 8,
 111   24 + 14 * 8,                  /* ... %r15 */
 112   24 + 19 * 8,                  /* %rip */
 113   24 + 21 * 8,                  /* %eflags */
 114   24 + 20 * 8,                  /* %cs */
 115   24 + 23 * 8,                  /* %ss */
 116   -1,                           /* %ds */
 117   -1,                           /* %es */
 118   -1,                           /* %fs */
 119   -1                            /* %gs */
 120 };
 121
 122 /* From /usr/src/lib/libc/amd64/gen/_setjmp.S.  */
 123 static int amd64fbsd_jmp_buf_reg_offset[] =
 124 {
 125   -1,                           /* %rax */
 126   1 * 8,                        /* %rbx */
 127   -1,                           /* %rcx */
 128   -1,                           /* %rdx */
 129   -1,                           /* %rsi */
 130   -1,                           /* %rdi */
 131   3 * 8,                        /* %rbp */
 132   2 * 8,                        /* %rsp */
 133   -1,                           /* %r8 ...  */
 134   -1,
 135   -1,
 136   -1,                           /* ... %r11 */
 137   4 * 8,                        /* %r12 ...  */
 138   5 * 8,
 139   6 * 8,
 140   7 * 8,                        /* ... %r15 */
 141   0 * 8                         /* %rip */
 142 };
 143
 144 static void
 145 amd64fbsd_supply_uthread (struct regcache *regcache,
 146                           int regnum, CORE_ADDR addr)
 147 {
 148   gdb_byte buf[8];
 149   int i;
 150
 151   gdb_assert (regnum >= -1);
 152
 153   for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
 154     {
 155       if (amd64fbsd_jmp_buf_reg_offset[i] != -1
 156           && (regnum == -1 || regnum == i))
 157         {
 158           read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
 159           regcache_raw_supply (regcache, i, buf);
 160         }
 161     }
 162 }
 163
 164 static void
 165 amd64fbsd_collect_uthread (const struct regcache *regcache,
 166                            int regnum, CORE_ADDR addr)
 167 {
 168   gdb_byte buf[8];
 169   int i;
 170
 171   gdb_assert (regnum >= -1);
 172
 173   for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
 174     {
 175       if (amd64fbsd_jmp_buf_reg_offset[i] != -1
 176           && (regnum == -1 || regnum == i))
 177         {
 178           regcache_raw_collect (regcache, i, buf);
 179           write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
 180         }
 181     }
 182 }
 183
 184 static void
 185 amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 186 {
 187   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 188
 189   /* Obviously FreeBSD is BSD-based.  */
 190   i386bsd_init_abi (info, gdbarch);
 191
 192   tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
 193   tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
 194   tdep->sizeof_gregset = 22 * 8;
 195
 196   amd64_init_abi (info, gdbarch);
 197
 198   tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
 199   tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
 200   tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
 201   tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
 202   tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
 203
 204   /* FreeBSD provides a user-level threads implementation.  */
 205   bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);
 206   bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);
 207
 208   /* FreeBSD uses SVR4-style shared libraries.  */
 209   set_solib_svr4_fetch_link_map_offsets
 210     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 211 }
 212 \f
 213
 214 /* Provide a prototype to silence -Wmissing-prototypes.  */
 215 void _initialize_amd64fbsd_tdep (void);
 216
 217 void
 218 _initialize_amd64fbsd_tdep (void)
 219 {
 220   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 221                           GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
 222 }