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/* Target-dependent code for FreeBSD/amd64.
Copyright (C) 2003-2015 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 "osabi.h"
#include "amd64-tdep.h"
#include "bsd-uthread.h"
#include "fbsd-tdep.h"
#include "solib-svr4.h"
/* Support for signal handlers. */
/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
routine. */
static const gdb_byte amd64fbsd_sigtramp_code[] =
{
0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */
0x6a, 0x00, /* pushq $0 */
0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
/* movq $SYS_sigreturn,%rax */
0x0f, 0x05 /* syscall */
};
static int
amd64fbsd_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
gdb_byte buf[sizeof amd64fbsd_sigtramp_code];
if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf))
return 0;
if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code) !=
0)
return 0;
return 1;
}
/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
address of the associated sigcontext structure. */
static CORE_ADDR
amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR sp;
gdb_byte buf[8];
/* The `struct sigcontext' (which really is an `ucontext_t' on
FreeBSD/amd64) lives at a fixed offset in the signal frame. See
<machine/sigframe.h>. */
get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 8, byte_order);
return sp + 16;
}
/* FreeBSD 5.1-RELEASE or later. */
/* Mapping between the general-purpose registers in `struct reg'
format and GDB's register cache layout.
Note that some registers are 32-bit, but since we're little-endian
we get away with that. */
/* From <machine/reg.h>. */
static int amd64fbsd_r_reg_offset[] =
{
14 * 8, /* %rax */
11 * 8, /* %rbx */
13 * 8, /* %rcx */
12 * 8, /* %rdx */
9 * 8, /* %rsi */
8 * 8, /* %rdi */
10 * 8, /* %rbp */
20 * 8, /* %rsp */
7 * 8, /* %r8 ... */
6 * 8,
5 * 8,
4 * 8,
3 * 8,
2 * 8,
1 * 8,
0 * 8, /* ... %r15 */
17 * 8, /* %rip */
19 * 8, /* %eflags */
18 * 8, /* %cs */
21 * 8, /* %ss */
-1, /* %ds */
-1, /* %es */
-1, /* %fs */
-1 /* %gs */
};
/* Location of the signal trampoline. */
CORE_ADDR amd64fbsd_sigtramp_start_addr;
CORE_ADDR amd64fbsd_sigtramp_end_addr;
/* From <machine/signal.h>. */
int amd64fbsd_sc_reg_offset[] =
{
24 + 6 * 8, /* %rax */
24 + 7 * 8, /* %rbx */
24 + 3 * 8, /* %rcx */
24 + 2 * 8, /* %rdx */
24 + 1 * 8, /* %rsi */
24 + 0 * 8, /* %rdi */
24 + 8 * 8, /* %rbp */
24 + 22 * 8, /* %rsp */
24 + 4 * 8, /* %r8 ... */
24 + 5 * 8,
24 + 9 * 8,
24 + 10 * 8,
24 + 11 * 8,
24 + 12 * 8,
24 + 13 * 8,
24 + 14 * 8, /* ... %r15 */
24 + 19 * 8, /* %rip */
24 + 21 * 8, /* %eflags */
24 + 20 * 8, /* %cs */
24 + 23 * 8, /* %ss */
-1, /* %ds */
-1, /* %es */
-1, /* %fs */
-1 /* %gs */
};
/* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
static int amd64fbsd_jmp_buf_reg_offset[] =
{
-1, /* %rax */
1 * 8, /* %rbx */
-1, /* %rcx */
-1, /* %rdx */
-1, /* %rsi */
-1, /* %rdi */
3 * 8, /* %rbp */
2 * 8, /* %rsp */
-1, /* %r8 ... */
-1,
-1,
-1, /* ... %r11 */
4 * 8, /* %r12 ... */
5 * 8,
6 * 8,
7 * 8, /* ... %r15 */
0 * 8 /* %rip */
};
static void
amd64fbsd_supply_uthread (struct regcache *regcache,
int regnum, CORE_ADDR addr)
{
gdb_byte buf[8];
int i;
gdb_assert (regnum >= -1);
for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
{
if (amd64fbsd_jmp_buf_reg_offset[i] != -1
&& (regnum == -1 || regnum == i))
{
read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
regcache_raw_supply (regcache, i, buf);
}
}
}
static void
amd64fbsd_collect_uthread (const struct regcache *regcache,
int regnum, CORE_ADDR addr)
{
gdb_byte buf[8];
int i;
gdb_assert (regnum >= -1);
for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
{
if (amd64fbsd_jmp_buf_reg_offset[i] != -1
&& (regnum == -1 || regnum == i))
{
regcache_raw_collect (regcache, i, buf);
write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
}
}
}
static void
amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* Generic FreeBSD support. */
fbsd_init_abi (info, gdbarch);
/* Obviously FreeBSD is BSD-based. */
i386bsd_init_abi (info, gdbarch);
tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
tdep->sizeof_gregset = 22 * 8;
amd64_init_abi (info, gdbarch);
tdep->sigtramp_p = amd64fbsd_sigtramp_p;
tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
/* FreeBSD provides a user-level threads implementation. */
bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);
bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);
/* FreeBSD uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64fbsd_tdep (void);
void
_initialize_amd64fbsd_tdep (void)
{
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
}
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