171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
|
/* Target-dependent code for OpenBSD/amd64.
|
|||
|
|
|||
|
Copyright 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 "frame.h"
|
|||
|
#include "gdbcore.h"
|
|||
|
#include "osabi.h"
|
|||
|
#include "target.h"
|
|||
|
|
|||
|
#include "gdb_assert.h"
|
|||
|
#include "gdb_string.h"
|
|||
|
|
|||
|
#include "x86-64-tdep.h"
|
|||
|
|
|||
|
/* Support for signal handlers. */
|
|||
|
|
|||
|
static const int amd64obsd_page_size = 4096;
|
|||
|
|
|||
|
static int
|
|||
|
amd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
|
|||
|
{
|
|||
|
CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
|
|||
|
const char sigreturn[] =
|
|||
|
{
|
|||
|
0x48, 0xc7, 0xc0,
|
|||
|
0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
|
|||
|
0x0f, 0x05 /* syscall */
|
|||
|
};
|
|||
|
char *buf;
|
|||
|
|
|||
|
if (name)
|
|||
|
return 0;
|
|||
|
|
|||
|
/* If we can't read the instructions at START_PC, return zero. */
|
|||
|
buf = alloca (sizeof sigreturn);
|
|||
|
if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn))
|
|||
|
return 0;
|
|||
|
|
|||
|
/* Check for sigreturn(2). */
|
|||
|
if (memcmp (buf, sigreturn, sizeof sigreturn))
|
|||
|
return 0;
|
|||
|
|
|||
|
return 1;
|
|||
|
}
|
|||
|
|
|||
|
/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
|
|||
|
routine, return the address of the associated sigcontext structure. */
|
|||
|
|
|||
|
static CORE_ADDR
|
|||
|
amd64obsd_sigcontext_addr (struct frame_info *next_frame)
|
|||
|
{
|
|||
|
/* The %rsp register points at `struct sigcontext' upon entry of a
|
|||
|
signal trampoline. */
|
|||
|
return frame_unwind_register_unsigned (next_frame, X86_64_RSP_REGNUM);
|
|||
|
}
|
|||
|
|
|||
|
/* OpenBSD 3.5 or later. */
|
|||
|
|
|||
|
/* Mapping between the general-purpose registers in `struct reg'
|
|||
|
format and GDB's register cache layout. */
|
|||
|
|
|||
|
/* From <machine/reg.h>. Used for ptrace(2), but not for core dumps. */
|
|||
|
int amd64obsd_r_reg_offset[] =
|
|||
|
{
|
|||
|
14 * 8, /* %rax */
|
|||
|
13 * 8, /* %rbx */
|
|||
|
3 * 8, /* %rcx */
|
|||
|
2 * 8, /* %rdx */
|
|||
|
1 * 8, /* %rsi */
|
|||
|
0 * 8, /* %rdi */
|
|||
|
12 * 8, /* %rbp */
|
|||
|
15 * 8, /* %rsp */
|
|||
|
4 * 8, /* %r8 .. */
|
|||
|
5 * 8,
|
|||
|
6 * 8,
|
|||
|
7 * 8,
|
|||
|
8 * 8,
|
|||
|
9 * 8,
|
|||
|
10 * 8,
|
|||
|
11 * 8, /* ... %r15 */
|
|||
|
16 * 8, /* %rip */
|
|||
|
17 * 8, /* %eflags */
|
|||
|
18 * 8, /* %cs */
|
|||
|
19 * 8, /* %ss */
|
|||
|
20 * 8, /* %ds */
|
|||
|
21 * 8, /* %es */
|
|||
|
22 * 8, /* %fs */
|
|||
|
23 * 8 /* %gs */
|
|||
|
};
|
|||
|
|
|||
|
/* From <machine/signal.h>. Also used for core dumps. */
|
|||
|
static int amd64obsd_sc_reg_offset[] =
|
|||
|
{
|
|||
|
14 * 8, /* %rax */
|
|||
|
13 * 8, /* %rbx */
|
|||
|
3 * 8, /* %rcx */
|
|||
|
2 * 8, /* %rdx */
|
|||
|
1 * 8, /* %rsi */
|
|||
|
0 * 8, /* %rdi */
|
|||
|
12 * 8, /* %rbp */
|
|||
|
24 * 8, /* %rsp */
|
|||
|
4 * 8, /* %r8 ... */
|
|||
|
5 * 8,
|
|||
|
6 * 8,
|
|||
|
7 * 8,
|
|||
|
8 * 8,
|
|||
|
9 * 8,
|
|||
|
10 * 8,
|
|||
|
11 * 8, /* ... %r15 */
|
|||
|
21 * 8, /* %rip */
|
|||
|
23 * 8, /* %eflags */
|
|||
|
22 * 8, /* %cs */
|
|||
|
25 * 8, /* %ss */
|
|||
|
18 * 8, /* %ds */
|
|||
|
17 * 8, /* %es */
|
|||
|
16 * 8, /* %fs */
|
|||
|
15 * 8 /* %gs */
|
|||
|
};
|
|||
|
|
|||
|
static void
|
|||
|
amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|||
|
{
|
|||
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|||
|
|
|||
|
/* Initialize general-purpose register set details first. */
|
|||
|
tdep->gregset_reg_offset = amd64obsd_sc_reg_offset;
|
|||
|
tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset);
|
|||
|
tdep->sizeof_gregset = 26 * 8;
|
|||
|
|
|||
|
x86_64_init_abi (info, gdbarch);
|
|||
|
|
|||
|
tdep->jb_pc_offset = 7 * 8;
|
|||
|
|
|||
|
set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp);
|
|||
|
tdep->sigcontext_addr = amd64obsd_sigcontext_addr;
|
|||
|
tdep->sc_reg_offset = amd64obsd_sc_reg_offset;
|
|||
|
tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset);
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|||
|
void _initialize_amd64obsd_tdep (void);
|
|||
|
|
|||
|
void
|
|||
|
_initialize_amd64obsd_ndep (void)
|
|||
|
{
|
|||
|
/* The OpenBSD/amd64 native dependent code makes this assumption. */
|
|||
|
gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == X86_64_NUM_GREGS);
|
|||
|
|
|||
|
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
|
|||
|
GDB_OSABI_OPENBSD_ELF, amd64obsd_init_abi);
|
|||
|
}
|