mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-25 02:53:48 +08:00
eba29c8cbb
* x86-64-linux-nat.c (regmap): Removed. (supply_gregset, fill_gregset): Call x86_64_linux_(fill,supply)_gregset functions. * x86-64-linux-tdep.c (USER_*): New defines. (user_to_gdb_regmap, x86_64_core_fns): New structure. (x86_64_linux_supply_gregset, x86_64_linux_fill_gregset): New functions. (fetch_core_registers): Ditto. (_initialize_x86_64_linux_tdep): Call add_core_fns(). * x86-64-linux-tdep.h: New file. * config/i386/x86-64linux.mh (NATDEPFILES): Remove corelow.o and core-regset.o. * config/i386/x86-64linux.mt (TDEPFILES): Add corelow.o.
293 lines
8.4 KiB
C
293 lines
8.4 KiB
C
/* Target-dependent code for GNU/Linux running on x86-64, for GDB.
|
||
|
||
Copyright 2001, 2003 Free Software Foundation, Inc.
|
||
|
||
Contributed by Jiri Smid, SuSE Labs.
|
||
|
||
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 "inferior.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "osabi.h"
|
||
|
||
#include "gdb_string.h"
|
||
|
||
#include "x86-64-tdep.h"
|
||
#include "x86-64-linux-tdep.h"
|
||
|
||
/* Register indexes to 'struct user' come from <sys/reg.h>. */
|
||
|
||
#define USER_R15 0
|
||
#define USER_R14 1
|
||
#define USER_R13 2
|
||
#define USER_R12 3
|
||
#define USER_RBP 4
|
||
#define USER_RBX 5
|
||
#define USER_R11 6
|
||
#define USER_R10 7
|
||
#define USER_R9 8
|
||
#define USER_R8 9
|
||
#define USER_RAX 10
|
||
#define USER_RCX 11
|
||
#define USER_RDX 12
|
||
#define USER_RSI 13
|
||
#define USER_RDI 14
|
||
#define USER_RIP 16
|
||
#define USER_CS 17
|
||
#define USER_EFLAGS 18
|
||
#define USER_RSP 19
|
||
#define USER_SS 20
|
||
#define USER_DS 23
|
||
#define USER_ES 24
|
||
#define USER_FS 25
|
||
#define USER_GS 26
|
||
|
||
/* Mapping between the general-purpose registers in `struct user'
|
||
format and GDB's register array layout. */
|
||
|
||
static int user_to_gdb_regmap[] =
|
||
{
|
||
USER_RAX, USER_RBX, USER_RCX, USER_RDX,
|
||
USER_RSI, USER_RDI, USER_RBP, USER_RSP,
|
||
USER_R8, USER_R9, USER_R10, USER_R11,
|
||
USER_R12, USER_R13, USER_R14, USER_R15,
|
||
USER_RIP, USER_EFLAGS, USER_CS, USER_SS,
|
||
USER_DS, USER_ES, USER_FS, USER_GS
|
||
};
|
||
|
||
/* Fill GDB's register array with the general-purpose register values
|
||
in *GREGSETP. */
|
||
|
||
void
|
||
x86_64_linux_supply_gregset (char *regp)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < X86_64_NUM_GREGS; i++)
|
||
supply_register (i, regp + (user_to_gdb_regmap[i] * 8));
|
||
}
|
||
|
||
/* Fill register REGNO (if it is a general-purpose register) in
|
||
*GREGSETPS with the value in GDB's register array. If REGNO is -1,
|
||
do this for all registers. */
|
||
|
||
void
|
||
x86_64_linux_fill_gregset (char *regp, int regno)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < X86_64_NUM_GREGS; i++)
|
||
if (regno == -1 || regno == i)
|
||
regcache_collect (i, regp + (user_to_gdb_regmap[i] * 8));
|
||
}
|
||
|
||
/* The register sets used in GNU/Linux ELF core-dumps are identical to
|
||
the register sets used by `ptrace'. The corresponding types are
|
||
`elf_gregset_t' for the general-purpose registers (with
|
||
`elf_greg_t' the type of a single GP register) and `elf_fpregset_t'
|
||
for the floating-point registers. */
|
||
|
||
static void
|
||
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
|
||
int which, CORE_ADDR ignore)
|
||
{
|
||
switch (which)
|
||
{
|
||
case 0: /* Integer registers. */
|
||
if (core_reg_size != 216)
|
||
warning ("Wrong size register set in core file.");
|
||
else
|
||
x86_64_linux_supply_gregset (core_reg_sect);
|
||
break;
|
||
|
||
case 2: /* Floating point registers. */
|
||
case 3: /* "Extended" floating point registers. This is gdb-speak
|
||
for SSE/SSE2. */
|
||
if (core_reg_size != 512)
|
||
warning ("Wrong size XMM register set in core file.");
|
||
else
|
||
x86_64_supply_fxsave (core_reg_sect);
|
||
break;
|
||
|
||
default:
|
||
/* Don't know what kind of register request this is; just ignore it. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
static struct core_fns x86_64_core_fns =
|
||
{
|
||
bfd_target_elf_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
#define LINUX_SIGTRAMP_INSN0 0x48 /* mov $NNNNNNNN, %rax */
|
||
#define LINUX_SIGTRAMP_OFFSET0 0
|
||
#define LINUX_SIGTRAMP_INSN1 0x0f /* syscall */
|
||
#define LINUX_SIGTRAMP_OFFSET1 7
|
||
|
||
static const unsigned char linux_sigtramp_code[] =
|
||
{
|
||
/* mov $__NR_rt_sigreturn, %rax */
|
||
LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x0f, 0x00, 0x00, 0x00,
|
||
/* syscall */
|
||
LINUX_SIGTRAMP_INSN1, 0x05
|
||
};
|
||
|
||
#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
|
||
|
||
/* If PC is in a sigtramp routine, return the address of the start of
|
||
the routine. Otherwise, return 0. */
|
||
|
||
static CORE_ADDR
|
||
x86_64_linux_sigtramp_start (CORE_ADDR pc)
|
||
{
|
||
unsigned char buf[LINUX_SIGTRAMP_LEN];
|
||
|
||
/* We only recognize a signal trampoline if PC is at the start of
|
||
one of the two instructions. We optimize for finding the PC at
|
||
the start, as will be the case when the trampoline is not the
|
||
first frame on the stack. We assume that in the case where the
|
||
PC is not at the start of the instruction sequence, there will be
|
||
a few trailing readable bytes on the stack. */
|
||
|
||
if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
|
||
return 0;
|
||
|
||
if (buf[0] != LINUX_SIGTRAMP_INSN0)
|
||
{
|
||
if (buf[0] != LINUX_SIGTRAMP_INSN1)
|
||
return 0;
|
||
|
||
pc -= LINUX_SIGTRAMP_OFFSET1;
|
||
|
||
if (read_memory_nobpt (pc, (char *) buf, LINUX_SIGTRAMP_LEN) != 0)
|
||
return 0;
|
||
}
|
||
|
||
if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
|
||
return 0;
|
||
|
||
return pc;
|
||
}
|
||
|
||
/* Return whether PC is in a GNU/Linux sigtramp routine. */
|
||
|
||
static int
|
||
x86_64_linux_pc_in_sigtramp (CORE_ADDR pc, char *name)
|
||
{
|
||
/* If we have NAME, we can optimize the search. The trampoline is
|
||
named __restore_rt. However, it isn't dynamically exported from
|
||
the shared C library, so the trampoline may appear to be part of
|
||
the preceding function. This should always be sigaction,
|
||
__sigaction, or __libc_sigaction (all aliases to the same
|
||
function). */
|
||
if (name == NULL || strstr (name, "sigaction") != NULL)
|
||
return (x86_64_linux_sigtramp_start (pc) != 0);
|
||
|
||
return (strcmp ("__restore_rt", name) == 0);
|
||
}
|
||
|
||
/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
|
||
#define X86_64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 40
|
||
|
||
/* Assuming NEXT_FRAME is a frame following a GNU/Linux sigtramp
|
||
routine, return the address of the associated sigcontext structure. */
|
||
|
||
static CORE_ADDR
|
||
x86_64_linux_sigcontext_addr (struct frame_info *next_frame)
|
||
{
|
||
CORE_ADDR sp;
|
||
char buf[8];
|
||
|
||
frame_unwind_register (next_frame, SP_REGNUM, buf);
|
||
sp = extract_unsigned_integer (buf, 8);
|
||
|
||
/* The sigcontext structure is part of the user context. A pointer
|
||
to the user context is passed as the third argument to the signal
|
||
handler, i.e. in %rdx. Unfortunately %rdx isn't preserved across
|
||
function calls so we can't use it. Fortunately the user context
|
||
is part of the signal frame and the unwound %rsp directly points
|
||
at it. */
|
||
return sp + X86_64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
|
||
}
|
||
|
||
|
||
/* From <asm/sigcontext.h>. */
|
||
static int x86_64_linux_sc_reg_offset[X86_64_NUM_GREGS] =
|
||
{
|
||
13 * 8, /* %rax */
|
||
11 * 8, /* %rbx */
|
||
14 * 8, /* %rcx */
|
||
12 * 8, /* %rdx */
|
||
9 * 8, /* %rsi */
|
||
8 * 8, /* %rdi */
|
||
10 * 8, /* %rbp */
|
||
15 * 8, /* %rsp */
|
||
0 * 8, /* %r8 */
|
||
1 * 8, /* %r9 */
|
||
2 * 8, /* %r10 */
|
||
3 * 8, /* %r11 */
|
||
4 * 8, /* %r12 */
|
||
5 * 8, /* %r13 */
|
||
6 * 8, /* %r14 */
|
||
7 * 8, /* %r15 */
|
||
16 * 8, /* %rip */
|
||
17 * 8, /* %eflags */
|
||
-1, /* %ds */
|
||
-1, /* %es */
|
||
|
||
/* FIXME: kettenis/2002030531: The registers %fs and %gs are
|
||
available in `struct sigcontext'. However, they only occupy two
|
||
bytes instead of four, which makes using them here rather
|
||
difficult. Leave them out for now. */
|
||
-1, /* %fs */
|
||
-1 /* %gs */
|
||
};
|
||
|
||
static void
|
||
x86_64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
x86_64_init_abi (info, gdbarch);
|
||
|
||
set_gdbarch_pc_in_sigtramp (gdbarch, x86_64_linux_pc_in_sigtramp);
|
||
|
||
tdep->sigcontext_addr = x86_64_linux_sigcontext_addr;
|
||
tdep->sc_reg_offset = x86_64_linux_sc_reg_offset;
|
||
tdep->sc_num_regs = X86_64_NUM_GREGS;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
extern void _initialize_x86_64_linux_tdep (void);
|
||
|
||
void
|
||
_initialize_x86_64_linux_tdep (void)
|
||
{
|
||
add_core_fns (&x86_64_core_fns);
|
||
|
||
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_LINUX,
|
||
x86_64_linux_init_abi);
|
||
}
|