| 1 |
227 |
jeremybenn |
/* Target-dependent code for NetBSD/i386.
|
| 2 |
|
|
|
| 3 |
|
|
Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003,
|
| 4 |
|
|
2004, 2007, 2008, 2009, 2010 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 "regset.h"
|
| 27 |
|
|
#include "osabi.h"
|
| 28 |
|
|
#include "symtab.h"
|
| 29 |
|
|
#include "trad-frame.h"
|
| 30 |
|
|
#include "tramp-frame.h"
|
| 31 |
|
|
|
| 32 |
|
|
#include "gdb_assert.h"
|
| 33 |
|
|
#include "gdb_string.h"
|
| 34 |
|
|
|
| 35 |
|
|
#include "i386-tdep.h"
|
| 36 |
|
|
#include "i387-tdep.h"
|
| 37 |
|
|
#include "nbsd-tdep.h"
|
| 38 |
|
|
#include "solib-svr4.h"
|
| 39 |
|
|
|
| 40 |
|
|
/* From <machine/reg.h>. */
|
| 41 |
|
|
static int i386nbsd_r_reg_offset[] =
|
| 42 |
|
|
{
|
| 43 |
|
|
|
| 44 |
|
|
1 * 4, /* %ecx */
|
| 45 |
|
|
2 * 4, /* %edx */
|
| 46 |
|
|
3 * 4, /* %ebx */
|
| 47 |
|
|
4 * 4, /* %esp */
|
| 48 |
|
|
5 * 4, /* %ebp */
|
| 49 |
|
|
6 * 4, /* %esi */
|
| 50 |
|
|
7 * 4, /* %edi */
|
| 51 |
|
|
8 * 4, /* %eip */
|
| 52 |
|
|
9 * 4, /* %eflags */
|
| 53 |
|
|
10 * 4, /* %cs */
|
| 54 |
|
|
11 * 4, /* %ss */
|
| 55 |
|
|
12 * 4, /* %ds */
|
| 56 |
|
|
13 * 4, /* %es */
|
| 57 |
|
|
14 * 4, /* %fs */
|
| 58 |
|
|
15 * 4 /* %gs */
|
| 59 |
|
|
};
|
| 60 |
|
|
|
| 61 |
|
|
/* From <machine/signal.h>. */
|
| 62 |
|
|
int i386nbsd_sc_reg_offset[] =
|
| 63 |
|
|
{
|
| 64 |
|
|
10 * 4, /* %eax */
|
| 65 |
|
|
9 * 4, /* %ecx */
|
| 66 |
|
|
8 * 4, /* %edx */
|
| 67 |
|
|
7 * 4, /* %ebx */
|
| 68 |
|
|
14 * 4, /* %esp */
|
| 69 |
|
|
6 * 4, /* %ebp */
|
| 70 |
|
|
5 * 4, /* %esi */
|
| 71 |
|
|
4 * 4, /* %edi */
|
| 72 |
|
|
11 * 4, /* %eip */
|
| 73 |
|
|
13 * 4, /* %eflags */
|
| 74 |
|
|
12 * 4, /* %cs */
|
| 75 |
|
|
15 * 4, /* %ss */
|
| 76 |
|
|
3 * 4, /* %ds */
|
| 77 |
|
|
2 * 4, /* %es */
|
| 78 |
|
|
1 * 4, /* %fs */
|
| 79 |
|
|
|
| 80 |
|
|
};
|
| 81 |
|
|
|
| 82 |
|
|
/* From <machine/mcontext.h>. */
|
| 83 |
|
|
int i386nbsd_mc_reg_offset[] =
|
| 84 |
|
|
{
|
| 85 |
|
|
11 * 4, /* %eax */
|
| 86 |
|
|
10 * 4, /* %ecx */
|
| 87 |
|
|
9 * 4, /* %edx */
|
| 88 |
|
|
8 * 4, /* %ebx */
|
| 89 |
|
|
7 * 4, /* %esp */
|
| 90 |
|
|
6 * 4, /* %ebp */
|
| 91 |
|
|
5 * 4, /* %esi */
|
| 92 |
|
|
4 * 4, /* %edi */
|
| 93 |
|
|
14 * 4, /* %eip */
|
| 94 |
|
|
16 * 4, /* %eflags */
|
| 95 |
|
|
15 * 4, /* %cs */
|
| 96 |
|
|
18 * 4, /* %ss */
|
| 97 |
|
|
3 * 4, /* %ds */
|
| 98 |
|
|
2 * 4, /* %es */
|
| 99 |
|
|
1 * 4, /* %fs */
|
| 100 |
|
|
|
| 101 |
|
|
};
|
| 102 |
|
|
|
| 103 |
|
|
static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
|
| 104 |
|
|
struct frame_info *,
|
| 105 |
|
|
struct trad_frame_cache *,
|
| 106 |
|
|
CORE_ADDR);
|
| 107 |
|
|
|
| 108 |
|
|
static const struct tramp_frame i386nbsd_sigtramp_sc16 =
|
| 109 |
|
|
{
|
| 110 |
|
|
SIGTRAMP_FRAME,
|
| 111 |
|
|
1,
|
| 112 |
|
|
{
|
| 113 |
|
|
{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
|
| 114 |
|
|
/* leal 0x10(%esp), %eax */
|
| 115 |
|
|
{ 0x50, -1 }, /* pushl %eax */
|
| 116 |
|
|
{ 0x50, -1 }, /* pushl %eax */
|
| 117 |
|
|
{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 118 |
|
|
/* movl $0x127, %eax # __sigreturn14 */
|
| 119 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 120 |
|
|
/* int $0x80 */
|
| 121 |
|
|
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 122 |
|
|
/* movl $0x1, %eax # exit */
|
| 123 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 124 |
|
|
/* int $0x80 */
|
| 125 |
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
| 126 |
|
|
},
|
| 127 |
|
|
i386nbsd_sigtramp_cache_init
|
| 128 |
|
|
};
|
| 129 |
|
|
|
| 130 |
|
|
static const struct tramp_frame i386nbsd_sigtramp_sc2 =
|
| 131 |
|
|
{
|
| 132 |
|
|
SIGTRAMP_FRAME,
|
| 133 |
|
|
1,
|
| 134 |
|
|
{
|
| 135 |
|
|
{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
|
| 136 |
|
|
/* leal 0x0c(%esp), %eax */
|
| 137 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 138 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 139 |
|
|
{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 140 |
|
|
/* movl $0x127, %eax # __sigreturn14 */
|
| 141 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 142 |
|
|
/* int $0x80 */
|
| 143 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 144 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 145 |
|
|
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 146 |
|
|
/* movl $0x1, %eax */
|
| 147 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 148 |
|
|
/* int $0x80 */
|
| 149 |
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
| 150 |
|
|
},
|
| 151 |
|
|
i386nbsd_sigtramp_cache_init
|
| 152 |
|
|
};
|
| 153 |
|
|
|
| 154 |
|
|
static const struct tramp_frame i386nbsd_sigtramp_si2 =
|
| 155 |
|
|
{
|
| 156 |
|
|
SIGTRAMP_FRAME,
|
| 157 |
|
|
1,
|
| 158 |
|
|
{
|
| 159 |
|
|
{ 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
|
| 160 |
|
|
/* movl 8(%esp),%eax */
|
| 161 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 162 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 163 |
|
|
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 164 |
|
|
/* movl $0x134, %eax # setcontext */
|
| 165 |
|
|
{ 0xcd, -1 }, { 0x80, -1 },
|
| 166 |
|
|
/* int $0x80 */
|
| 167 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 168 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 169 |
|
|
{ 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 170 |
|
|
/* movl $0x1, %eax */
|
| 171 |
|
|
{ 0xcd, -1 }, { 0x80, -1 },
|
| 172 |
|
|
/* int $0x80 */
|
| 173 |
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
| 174 |
|
|
},
|
| 175 |
|
|
i386nbsd_sigtramp_cache_init
|
| 176 |
|
|
};
|
| 177 |
|
|
|
| 178 |
|
|
static const struct tramp_frame i386nbsd_sigtramp_si31 =
|
| 179 |
|
|
{
|
| 180 |
|
|
SIGTRAMP_FRAME,
|
| 181 |
|
|
1,
|
| 182 |
|
|
{
|
| 183 |
|
|
{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
|
| 184 |
|
|
{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 185 |
|
|
/* leal 0x8c(%esp), %eax */
|
| 186 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 187 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 188 |
|
|
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 189 |
|
|
/* movl $0x134, %eax # setcontext */
|
| 190 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 191 |
|
|
/* int $0x80 */
|
| 192 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 193 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 194 |
|
|
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 195 |
|
|
/* movl $0x1, %eax */
|
| 196 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 197 |
|
|
/* int $0x80 */
|
| 198 |
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
| 199 |
|
|
},
|
| 200 |
|
|
i386nbsd_sigtramp_cache_init
|
| 201 |
|
|
};
|
| 202 |
|
|
|
| 203 |
|
|
static const struct tramp_frame i386nbsd_sigtramp_si4 =
|
| 204 |
|
|
{
|
| 205 |
|
|
SIGTRAMP_FRAME,
|
| 206 |
|
|
1,
|
| 207 |
|
|
{
|
| 208 |
|
|
{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
|
| 209 |
|
|
{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 210 |
|
|
/* leal 0x8c(%esp), %eax */
|
| 211 |
|
|
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 212 |
|
|
/* movl %eax, 0x4(%esp) */
|
| 213 |
|
|
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
|
| 214 |
|
|
/* movl $0x134, %eax # setcontext */
|
| 215 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 216 |
|
|
/* int $0x80 */
|
| 217 |
|
|
{ 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
|
| 218 |
|
|
{ 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
|
| 219 |
|
|
/* movl $0xffffffff,0x4(%esp) */
|
| 220 |
|
|
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
|
| 221 |
|
|
/* movl $0x1, %eax */
|
| 222 |
|
|
{ 0xcd, -1 }, { 0x80, -1},
|
| 223 |
|
|
/* int $0x80 */
|
| 224 |
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
| 225 |
|
|
},
|
| 226 |
|
|
i386nbsd_sigtramp_cache_init
|
| 227 |
|
|
};
|
| 228 |
|
|
|
| 229 |
|
|
static void
|
| 230 |
|
|
i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
|
| 231 |
|
|
struct frame_info *this_frame,
|
| 232 |
|
|
struct trad_frame_cache *this_cache,
|
| 233 |
|
|
CORE_ADDR func)
|
| 234 |
|
|
{
|
| 235 |
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
| 236 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 237 |
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
| 238 |
|
|
CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
|
| 239 |
|
|
CORE_ADDR base;
|
| 240 |
|
|
int *reg_offset;
|
| 241 |
|
|
int num_regs;
|
| 242 |
|
|
int i;
|
| 243 |
|
|
|
| 244 |
|
|
if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
|
| 245 |
|
|
{
|
| 246 |
|
|
reg_offset = i386nbsd_sc_reg_offset;
|
| 247 |
|
|
num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
|
| 248 |
|
|
|
| 249 |
|
|
/* Read in the sigcontext address */
|
| 250 |
|
|
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
|
| 251 |
|
|
}
|
| 252 |
|
|
else
|
| 253 |
|
|
{
|
| 254 |
|
|
reg_offset = i386nbsd_mc_reg_offset;
|
| 255 |
|
|
num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
|
| 256 |
|
|
|
| 257 |
|
|
/* Read in the ucontext address */
|
| 258 |
|
|
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
|
| 259 |
|
|
/* offsetof(ucontext_t, uc_mcontext) == 36 */
|
| 260 |
|
|
base += 36;
|
| 261 |
|
|
}
|
| 262 |
|
|
|
| 263 |
|
|
for (i = 0; i < num_regs; i++)
|
| 264 |
|
|
if (reg_offset[i] != -1)
|
| 265 |
|
|
trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
|
| 266 |
|
|
|
| 267 |
|
|
/* Construct the frame ID using the function start. */
|
| 268 |
|
|
trad_frame_set_id (this_cache, frame_id_build (sp, func));
|
| 269 |
|
|
}
|
| 270 |
|
|
|
| 271 |
|
|
|
| 272 |
|
|
static void
|
| 273 |
|
|
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
| 274 |
|
|
{
|
| 275 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 276 |
|
|
|
| 277 |
|
|
/* Obviously NetBSD is BSD-based. */
|
| 278 |
|
|
i386bsd_init_abi (info, gdbarch);
|
| 279 |
|
|
|
| 280 |
|
|
/* NetBSD has a different `struct reg'. */
|
| 281 |
|
|
tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
|
| 282 |
|
|
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
|
| 283 |
|
|
tdep->sizeof_gregset = 16 * 4;
|
| 284 |
|
|
|
| 285 |
|
|
/* NetBSD uses -freg-struct-return by default. */
|
| 286 |
|
|
tdep->struct_return = reg_struct_return;
|
| 287 |
|
|
|
| 288 |
|
|
/* NetBSD uses tramp_frame sniffers for signal trampolines. */
|
| 289 |
|
|
tdep->sigcontext_addr= 0;
|
| 290 |
|
|
tdep->sigtramp_start = 0;
|
| 291 |
|
|
tdep->sigtramp_end = 0;
|
| 292 |
|
|
tdep->sigtramp_p = 0;
|
| 293 |
|
|
tdep->sc_reg_offset = 0;
|
| 294 |
|
|
tdep->sc_num_regs = 0;
|
| 295 |
|
|
|
| 296 |
|
|
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
|
| 297 |
|
|
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
|
| 298 |
|
|
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
|
| 299 |
|
|
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
|
| 300 |
|
|
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
|
| 301 |
|
|
}
|
| 302 |
|
|
|
| 303 |
|
|
/* NetBSD ELF. */
|
| 304 |
|
|
|
| 305 |
|
|
static void
|
| 306 |
|
|
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
| 307 |
|
|
{
|
| 308 |
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
| 309 |
|
|
|
| 310 |
|
|
/* It's still NetBSD. */
|
| 311 |
|
|
i386nbsd_init_abi (info, gdbarch);
|
| 312 |
|
|
|
| 313 |
|
|
/* But ELF-based. */
|
| 314 |
|
|
i386_elf_init_abi (info, gdbarch);
|
| 315 |
|
|
|
| 316 |
|
|
/* NetBSD ELF uses SVR4-style shared libraries. */
|
| 317 |
|
|
set_solib_svr4_fetch_link_map_offsets
|
| 318 |
|
|
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
| 319 |
|
|
|
| 320 |
|
|
/* NetBSD ELF uses -fpcc-struct-return by default. */
|
| 321 |
|
|
tdep->struct_return = pcc_struct_return;
|
| 322 |
|
|
}
|
| 323 |
|
|
|
| 324 |
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
| 325 |
|
|
extern initialize_file_ftype _initialize_i386nbsd_tdep;
|
| 326 |
|
|
|
| 327 |
|
|
void
|
| 328 |
|
|
_initialize_i386nbsd_tdep (void)
|
| 329 |
|
|
{
|
| 330 |
|
|
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
|
| 331 |
|
|
i386nbsdelf_init_abi);
|
| 332 |
|
|
}
|
