mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-11-24 12:39:59 +00:00
387c058c87
from CORE_ADDR to struct frame_info *. Use safe_frame_unwind_memory instead of deprecated_read_memory_nobpt. (amd64_linux_sigtramp_p): Adjust for changed signature of and64_linux_sigtramp_start
234 lines
6.7 KiB
C
234 lines
6.7 KiB
C
/* Target-dependent code for GNU/Linux x86-64.
|
||
|
||
Copyright 2001, 2003, 2004 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 "frame.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "osabi.h"
|
||
#include "symtab.h"
|
||
|
||
#include "gdb_string.h"
|
||
|
||
#include "amd64-tdep.h"
|
||
#include "solib-svr4.h"
|
||
|
||
/* Mapping between the general-purpose registers in `struct user'
|
||
format and GDB's register cache layout. */
|
||
|
||
/* From <sys/reg.h>. */
|
||
static int amd64_linux_gregset_reg_offset[] =
|
||
{
|
||
10 * 8, /* %rax */
|
||
5 * 8, /* %rbx */
|
||
11 * 8, /* %rcx */
|
||
12 * 8, /* %rdx */
|
||
13 * 8, /* %rsi */
|
||
14 * 8, /* %rdi */
|
||
4 * 8, /* %rbp */
|
||
19 * 8, /* %rsp */
|
||
9 * 8, /* %r8 ... */
|
||
8 * 8,
|
||
7 * 8,
|
||
6 * 8,
|
||
3 * 8,
|
||
2 * 8,
|
||
1 * 8,
|
||
0 * 8, /* ... %r15 */
|
||
16 * 8, /* %rip */
|
||
18 * 8, /* %eflags */
|
||
17 * 8, /* %cs */
|
||
20 * 8, /* %ss */
|
||
23 * 8, /* %ds */
|
||
24 * 8, /* %es */
|
||
25 * 8, /* %fs */
|
||
26 * 8 /* %gs */
|
||
};
|
||
|
||
|
||
/* Support for signal handlers. */
|
||
|
||
#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
|
||
amd64_linux_sigtramp_start (struct frame_info *next_frame)
|
||
{
|
||
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
||
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 (!safe_frame_unwind_memory (next_frame, pc, buf, LINUX_SIGTRAMP_LEN))
|
||
return 0;
|
||
|
||
if (buf[0] != LINUX_SIGTRAMP_INSN0)
|
||
{
|
||
if (buf[0] != LINUX_SIGTRAMP_INSN1)
|
||
return 0;
|
||
|
||
pc -= LINUX_SIGTRAMP_OFFSET1;
|
||
|
||
if (!safe_frame_unwind_memory (next_frame, pc, buf, LINUX_SIGTRAMP_LEN))
|
||
return 0;
|
||
}
|
||
|
||
if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
|
||
return 0;
|
||
|
||
return pc;
|
||
}
|
||
|
||
/* Return whether the frame preceding NEXT_FRAME corresponds to a
|
||
GNU/Linux sigtramp routine. */
|
||
|
||
static int
|
||
amd64_linux_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);
|
||
|
||
/* 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 (amd64_linux_sigtramp_start (next_frame) != 0);
|
||
|
||
return (strcmp ("__restore_rt", name) == 0);
|
||
}
|
||
|
||
/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
|
||
#define AMD64_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
|
||
amd64_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 + AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
|
||
}
|
||
|
||
|
||
/* From <asm/sigcontext.h>. */
|
||
static int amd64_linux_sc_reg_offset[] =
|
||
{
|
||
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 */
|
||
|
||
/* FIXME: kettenis/2002030531: The registers %cs, %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, /* %cs */
|
||
-1, /* %ss */
|
||
-1, /* %ds */
|
||
-1, /* %es */
|
||
-1, /* %fs */
|
||
-1 /* %gs */
|
||
};
|
||
|
||
static void
|
||
amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
tdep->gregset_reg_offset = amd64_linux_gregset_reg_offset;
|
||
tdep->gregset_num_regs = ARRAY_SIZE (amd64_linux_gregset_reg_offset);
|
||
tdep->sizeof_gregset = 27 * 8;
|
||
|
||
amd64_init_abi (info, gdbarch);
|
||
|
||
tdep->sigtramp_p = amd64_linux_sigtramp_p;
|
||
tdep->sigcontext_addr = amd64_linux_sigcontext_addr;
|
||
tdep->sc_reg_offset = amd64_linux_sc_reg_offset;
|
||
tdep->sc_num_regs = ARRAY_SIZE (amd64_linux_sc_reg_offset);
|
||
|
||
/* GNU/Linux 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. */
|
||
extern void _initialize_amd64_linux_tdep (void);
|
||
|
||
void
|
||
_initialize_amd64_linux_tdep (void)
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
|
||
GDB_OSABI_LINUX, amd64_linux_init_abi);
|
||
}
|