0528d9f717
* vaxnbsd-tdep.c (vaxnbsd_elf_init_abi): Do not set in_solib_call_trampoline to its default value of generic_in_solib_call_trampoline. * ppcobsd-tdep.c (ppcobsd_init_abi): Ditto. * m68kbsd-tdep.c (m68kbsd_elf_init_abi): Ditto. * i386obsd-tdep.c (i386obsd_elf_init_abi): Ditto. * i386nbsd-tdep.c (i386nbsdelf_init_abi): Ditto. * i386fbsd-tdep.c (i386fbsd_init_abi): Ditto. * hppabsd-tdep.c (hppabsd_init_abi): Ditto.
288 lines
7.5 KiB
C
288 lines
7.5 KiB
C
/* Target-dependent code for NetBSD/i386.
|
|
|
|
Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
|
|
2003, 2004
|
|
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 2 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, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#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 "gdb_assert.h"
|
|
#include "gdb_string.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 */
|
|
};
|
|
|
|
static void
|
|
i386nbsd_aout_supply_regset (const struct regset *regset,
|
|
struct regcache *regcache, int regnum,
|
|
const void *regs, size_t len)
|
|
{
|
|
const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
|
|
|
|
gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
|
|
|
|
i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
|
|
i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
|
|
}
|
|
|
|
static const struct regset *
|
|
i386nbsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
|
|
const char *sect_name,
|
|
size_t sect_size)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
/* NetBSD a.out core dumps don't use seperate register sets for the
|
|
general-purpose and floating-point registers. */
|
|
|
|
if (strcmp (sect_name, ".reg") == 0
|
|
&& sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
|
|
{
|
|
if (tdep->gregset == NULL)
|
|
tdep->gregset =
|
|
regset_alloc (gdbarch, i386nbsd_aout_supply_regset, NULL);
|
|
return tdep->gregset;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Under NetBSD/i386, signal handler invocations can be identified by the
|
|
designated code sequence that is used to return from a signal handler.
|
|
In particular, the return address of a signal handler points to the
|
|
following code sequence:
|
|
|
|
leal 0x10(%esp), %eax
|
|
pushl %eax
|
|
pushl %eax
|
|
movl $0x127, %eax # __sigreturn14
|
|
int $0x80
|
|
|
|
Each instruction has a unique encoding, so we simply attempt to match
|
|
the instruction the PC is pointing to with any of the above instructions.
|
|
If there is a hit, we know the offset to the start of the designated
|
|
sequence and can then check whether we really are executing in the
|
|
signal trampoline. If not, -1 is returned, otherwise the offset from the
|
|
start of the return sequence is returned. */
|
|
#define RETCODE_INSN1 0x8d
|
|
#define RETCODE_INSN2 0x50
|
|
#define RETCODE_INSN3 0x50
|
|
#define RETCODE_INSN4 0xb8
|
|
#define RETCODE_INSN5 0xcd
|
|
|
|
#define RETCODE_INSN2_OFF 4
|
|
#define RETCODE_INSN3_OFF 5
|
|
#define RETCODE_INSN4_OFF 6
|
|
#define RETCODE_INSN5_OFF 11
|
|
|
|
static const unsigned char sigtramp_retcode[] =
|
|
{
|
|
RETCODE_INSN1, 0x44, 0x24, 0x10,
|
|
RETCODE_INSN2,
|
|
RETCODE_INSN3,
|
|
RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
|
|
RETCODE_INSN5, 0x80,
|
|
};
|
|
|
|
static LONGEST
|
|
i386nbsd_sigtramp_offset (struct frame_info *next_frame)
|
|
{
|
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
|
unsigned char ret[sizeof(sigtramp_retcode)], insn;
|
|
LONGEST off;
|
|
int i;
|
|
|
|
if (!safe_frame_unwind_memory (next_frame, pc, &insn, 1))
|
|
return -1;
|
|
|
|
switch (insn)
|
|
{
|
|
case RETCODE_INSN1:
|
|
off = 0;
|
|
break;
|
|
|
|
case RETCODE_INSN2:
|
|
/* INSN2 and INSN3 are the same. Read at the location of PC+1
|
|
to determine if we're actually looking at INSN2 or INSN3. */
|
|
if (!safe_frame_unwind_memory (next_frame, pc + 1, &insn, 1))
|
|
return -1;
|
|
|
|
if (insn == RETCODE_INSN3)
|
|
off = RETCODE_INSN2_OFF;
|
|
else
|
|
off = RETCODE_INSN3_OFF;
|
|
break;
|
|
|
|
case RETCODE_INSN4:
|
|
off = RETCODE_INSN4_OFF;
|
|
break;
|
|
|
|
case RETCODE_INSN5:
|
|
off = RETCODE_INSN5_OFF;
|
|
break;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
pc -= off;
|
|
|
|
if (!safe_frame_unwind_memory (next_frame, pc, ret, sizeof (ret)))
|
|
return -1;
|
|
|
|
if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
|
|
return off;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* Return whether the frame preceding NEXT_FRAME corresponds to a
|
|
NetBSD sigtramp routine. */
|
|
|
|
static int
|
|
i386nbsd_sigtramp_p (struct frame_info *next_frame)
|
|
{
|
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
|
char *name;
|
|
|
|
find_pc_partial_function (pc, &name, NULL, NULL);
|
|
return (nbsd_pc_in_sigtramp (pc, name)
|
|
|| i386nbsd_sigtramp_offset (next_frame) >= 0);
|
|
}
|
|
|
|
/* 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 */
|
|
};
|
|
|
|
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 has different signal trampoline conventions. */
|
|
tdep->sigtramp_start = 0;
|
|
tdep->sigtramp_end = 0;
|
|
tdep->sigtramp_p = i386nbsd_sigtramp_p;
|
|
|
|
/* NetBSD uses -freg-struct-return by default. */
|
|
tdep->struct_return = reg_struct_return;
|
|
|
|
/* NetBSD has a `struct sigcontext' that's different from the
|
|
original 4.3 BSD. */
|
|
tdep->sc_reg_offset = i386nbsd_sc_reg_offset;
|
|
tdep->sc_num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
|
|
}
|
|
|
|
/* NetBSD a.out. */
|
|
|
|
static void
|
|
i386nbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
i386nbsd_init_abi (info, gdbarch);
|
|
|
|
/* NetBSD a.out has a single register set. */
|
|
set_gdbarch_regset_from_core_section
|
|
(gdbarch, i386nbsd_aout_regset_from_core_section);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
void
|
|
_initialize_i386nbsd_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_AOUT,
|
|
i386nbsdaout_init_abi);
|
|
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
|
|
i386nbsdelf_init_abi);
|
|
}
|