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i386nbsd-tdep.c
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/* Target-dependent code for NetBSD/i386.
Copyright (C) 1988-2015 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "osabi.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "nbsd-tdep.h"
#include "solib-svr4.h"
/* From <machine/reg.h>. */
static int i386nbsd_r_reg_offset[] =
{
0 * 4, /* %eax */
1 * 4, /* %ecx */
2 * 4, /* %edx */
3 * 4, /* %ebx */
4 * 4, /* %esp */
5 * 4, /* %ebp */
6 * 4, /* %esi */
7 * 4, /* %edi */
8 * 4, /* %eip */
9 * 4, /* %eflags */
10 * 4, /* %cs */
11 * 4, /* %ss */
12 * 4, /* %ds */
13 * 4, /* %es */
14 * 4, /* %fs */
15 * 4 /* %gs */
};
/* From <machine/signal.h>. */
int i386nbsd_sc_reg_offset[] =
{
10 * 4, /* %eax */
9 * 4, /* %ecx */
8 * 4, /* %edx */
7 * 4, /* %ebx */
14 * 4, /* %esp */
6 * 4, /* %ebp */
5 * 4, /* %esi */
4 * 4, /* %edi */
11 * 4, /* %eip */
13 * 4, /* %eflags */
12 * 4, /* %cs */
15 * 4, /* %ss */
3 * 4, /* %ds */
2 * 4, /* %es */
1 * 4, /* %fs */
0 * 4 /* %gs */
};
/* From <machine/mcontext.h>. */
int i386nbsd_mc_reg_offset[] =
{
11 * 4, /* %eax */
10 * 4, /* %ecx */
9 * 4, /* %edx */
8 * 4, /* %ebx */
7 * 4, /* %esp */
6 * 4, /* %ebp */
5 * 4, /* %esi */
4 * 4, /* %edi */
14 * 4, /* %eip */
16 * 4, /* %eflags */
15 * 4, /* %cs */
18 * 4, /* %ss */
3 * 4, /* %ds */
2 * 4, /* %es */
1 * 4, /* %fs */
0 * 4 /* %gs */
};
static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
struct frame_info *,
struct trad_frame_cache *,
CORE_ADDR);
static const struct tramp_frame i386nbsd_sigtramp_sc16 =
{
SIGTRAMP_FRAME,
1,
{
{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
/* leal 0x10(%esp), %eax */
{ 0x50, -1 }, /* pushl %eax */
{ 0x50, -1 }, /* pushl %eax */
{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x127, %eax # __sigreturn14 */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x1, %eax # exit */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ TRAMP_SENTINEL_INSN, -1 }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_sc2 =
{
SIGTRAMP_FRAME,
1,
{
{ 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
/* leal 0x0c(%esp), %eax */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x127, %eax # __sigreturn14 */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x1, %eax */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ TRAMP_SENTINEL_INSN, -1 }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si2 =
{
SIGTRAMP_FRAME,
1,
{
{ 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
/* movl 8(%esp),%eax */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* movl $0x134, %eax # setcontext */
{ 0xcd, -1 }, { 0x80, -1 },
/* int $0x80 */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* movl $0x1, %eax */
{ 0xcd, -1 }, { 0x80, -1 },
/* int $0x80 */
{ TRAMP_SENTINEL_INSN, -1 }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si31 =
{
SIGTRAMP_FRAME,
1,
{
{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* leal 0x8c(%esp), %eax */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* movl $0x134, %eax # setcontext */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x1, %eax */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ TRAMP_SENTINEL_INSN, -1 }
},
i386nbsd_sigtramp_cache_init
};
static const struct tramp_frame i386nbsd_sigtramp_si4 =
{
SIGTRAMP_FRAME,
1,
{
{ 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
{ 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* leal 0x8c(%esp), %eax */
{ 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
/* movl %eax, 0x4(%esp) */
{ 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
/* movl $0x134, %eax # setcontext */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
{ 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
/* movl $0xffffffff,0x4(%esp) */
{ 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
/* movl $0x1, %eax */
{ 0xcd, -1 }, { 0x80, -1},
/* int $0x80 */
{ TRAMP_SENTINEL_INSN, -1 }
},
i386nbsd_sigtramp_cache_init
};
static void
i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
CORE_ADDR base;
int *reg_offset;
int num_regs;
int i;
if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
{
reg_offset = i386nbsd_sc_reg_offset;
num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
/* Read in the sigcontext address. */
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
}
else
{
reg_offset = i386nbsd_mc_reg_offset;
num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
/* Read in the ucontext address. */
base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
/* offsetof(ucontext_t, uc_mcontext) == 36 */
base += 36;
}
for (i = 0; i < num_regs; i++)
if (reg_offset[i] != -1)
trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
/* Construct the frame ID using the function start. */
trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Obviously NetBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
/* NetBSD has a different `struct reg'. */
tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
tdep->sizeof_gregset = 16 * 4;
/* NetBSD uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
/* NetBSD uses tramp_frame sniffers for signal trampolines. */
tdep->sigcontext_addr= 0;
tdep->sigtramp_start = 0;
tdep->sigtramp_end = 0;
tdep->sigtramp_p = 0;
tdep->sc_reg_offset = 0;
tdep->sc_num_regs = 0;
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
}
/* NetBSD ELF. */
static void
i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* It's still NetBSD. */
i386nbsd_init_abi (info, gdbarch);
/* But ELF-based. */
i386_elf_init_abi (info, gdbarch);
/* NetBSD ELF uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* NetBSD ELF uses -fpcc-struct-return by default. */
tdep->struct_return = pcc_struct_return;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_i386nbsd_tdep;
void
_initialize_i386nbsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
i386nbsdelf_init_abi);
}