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/* 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);
}
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