contrib/gdb-7/gdb/amd64dfly-tdep.c

   1 /* Target-dependent code for DragonFly/amd64.
   2
   3    Copyright (C) 2003-2013 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "arch-utils.h"
  22 #include "frame.h"
  23 #include "gdbcore.h"
  24 #include "regcache.h"
  25 #include "osabi.h"
  26
  27 #include "gdb_assert.h"
  28 #include "gdb_string.h"
  29
  30 #include "amd64-tdep.h"
  31 #include "solib-svr4.h"
  32
  33 /* Support for signal handlers.  */
  34
  35 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
  36    address of the associated sigcontext structure.  */
  37
  38 static CORE_ADDR
  39 amd64dfly_sigcontext_addr (struct frame_info *this_frame)
  40 {
  41   struct gdbarch *gdbarch = get_frame_arch (this_frame);
  42   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  43   CORE_ADDR sp;
  44   gdb_byte buf[8];
  45
  46   /* The `struct sigcontext' (which really is an `ucontext_t' on
  47      DragonFly/amd64) lives at a fixed offset in the signal frame.  See
  48      <machine/sigframe.h>.  */
  49   get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
  50   sp = extract_unsigned_integer (buf, 8, byte_order);
  51   return sp + 16;
  52 }
  53 \f
  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 amd64dfly_r_reg_offset[] =
  62 {
  63   6 * 8,                        /* %rax */
  64   7 * 8,                        /* %rbx */
  65   3 * 8,                        /* %rcx */
  66   2 * 8,                        /* %rdx */
  67   1 * 8,                        /* %rsi */
  68   0 * 8,                        /* %rdi */
  69   8 * 8,                        /* %rbp */
  70   23 * 8,                       /* %rsp */
  71   4 * 8,                        /* %r8 ... */
  72   5 * 8,
  73   9 * 8,
  74   10 * 8,
  75   11 * 8,
  76   12 * 8,
  77   13 * 8,
  78   14 * 8,                       /* ... %r15 */
  79   20 * 8,                       /* %rip */
  80   22 * 8,                       /* %eflags */
  81   21 * 8,                       /* %cs */
  82   24 * 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 amd64dfly_sigtramp_start_addr = 0x7fffffffffc0ULL;
  91 CORE_ADDR amd64dfly_sigtramp_end_addr = 0x7fffffffffe0ULL;
  92
  93 /* From <machine/signal.h>.  */
  94 int amd64dfly_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 + 23 * 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 + 20 * 8,                  /* %rip */
 113   24 + 22 * 8,                  /* %eflags */
 114   24 + 21 * 8,                  /* %cs */
 115   24 + 24 * 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 amd64dfly_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 amd64dfly_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 146 {
 147   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 148
 149   i386bsd_init_abi (info, gdbarch);
 150
 151   tdep->gregset_reg_offset = amd64dfly_r_reg_offset;
 152   tdep->gregset_num_regs = ARRAY_SIZE (amd64dfly_r_reg_offset);
 153   tdep->sizeof_gregset = 25 * 8;
 154
 155   amd64_init_abi (info, gdbarch);
 156
 157   tdep->sigtramp_start = amd64dfly_sigtramp_start_addr;
 158   tdep->sigtramp_end = amd64dfly_sigtramp_end_addr;
 159   tdep->sigcontext_addr = amd64dfly_sigcontext_addr;
 160   tdep->sc_reg_offset = amd64dfly_sc_reg_offset;
 161   tdep->sc_num_regs = ARRAY_SIZE (amd64dfly_sc_reg_offset);
 162
 163   set_solib_svr4_fetch_link_map_offsets
 164     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 165 }
 166 \f
 167
 168 /* Provide a prototype to silence -Wmissing-prototypes.  */
 169 void _initialize_amd64dfly_tdep (void);
 170
 171 void
 172 _initialize_amd64dfly_tdep (void)
 173 {
 174   gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
 175                           GDB_OSABI_DRAGONFLY, amd64dfly_init_abi);
 176 }