/* Target-dependent code for GNU/Linux x86-64.
|
/* Target-dependent code for GNU/Linux x86-64.
|
|
|
Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
|
Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
|
Free Software Foundation, Inc.
|
Free Software Foundation, Inc.
|
Contributed by Jiri Smid, SuSE Labs.
|
Contributed by Jiri Smid, SuSE Labs.
|
|
|
This file is part of GDB.
|
This file is part of GDB.
|
|
|
This program is free software; you can redistribute it and/or modify
|
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
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 3 of the License, or
|
the Free Software Foundation; either version 3 of the License, or
|
(at your option) any later version.
|
(at your option) any later version.
|
|
|
This program is distributed in the hope that it will be useful,
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
#include "defs.h"
|
#include "defs.h"
|
#include "frame.h"
|
#include "frame.h"
|
#include "gdbcore.h"
|
#include "gdbcore.h"
|
#include "regcache.h"
|
#include "regcache.h"
|
#include "osabi.h"
|
#include "osabi.h"
|
#include "symtab.h"
|
#include "symtab.h"
|
#include "gdbtypes.h"
|
#include "gdbtypes.h"
|
#include "reggroups.h"
|
#include "reggroups.h"
|
#include "amd64-linux-tdep.h"
|
#include "amd64-linux-tdep.h"
|
|
|
#include "gdb_string.h"
|
#include "gdb_string.h"
|
|
|
#include "amd64-tdep.h"
|
#include "amd64-tdep.h"
|
#include "solib-svr4.h"
|
#include "solib-svr4.h"
|
|
|
/* Mapping between the general-purpose registers in `struct user'
|
/* Mapping between the general-purpose registers in `struct user'
|
format and GDB's register cache layout. */
|
format and GDB's register cache layout. */
|
|
|
/* From <sys/reg.h>. */
|
/* From <sys/reg.h>. */
|
static int amd64_linux_gregset_reg_offset[] =
|
static int amd64_linux_gregset_reg_offset[] =
|
{
|
{
|
10 * 8, /* %rax */
|
10 * 8, /* %rax */
|
5 * 8, /* %rbx */
|
5 * 8, /* %rbx */
|
11 * 8, /* %rcx */
|
11 * 8, /* %rcx */
|
12 * 8, /* %rdx */
|
12 * 8, /* %rdx */
|
13 * 8, /* %rsi */
|
13 * 8, /* %rsi */
|
14 * 8, /* %rdi */
|
14 * 8, /* %rdi */
|
4 * 8, /* %rbp */
|
4 * 8, /* %rbp */
|
19 * 8, /* %rsp */
|
19 * 8, /* %rsp */
|
9 * 8, /* %r8 ... */
|
9 * 8, /* %r8 ... */
|
8 * 8,
|
8 * 8,
|
7 * 8,
|
7 * 8,
|
6 * 8,
|
6 * 8,
|
3 * 8,
|
3 * 8,
|
2 * 8,
|
2 * 8,
|
1 * 8,
|
1 * 8,
|
0 * 8, /* ... %r15 */
|
0 * 8, /* ... %r15 */
|
16 * 8, /* %rip */
|
16 * 8, /* %rip */
|
18 * 8, /* %eflags */
|
18 * 8, /* %eflags */
|
17 * 8, /* %cs */
|
17 * 8, /* %cs */
|
20 * 8, /* %ss */
|
20 * 8, /* %ss */
|
23 * 8, /* %ds */
|
23 * 8, /* %ds */
|
24 * 8, /* %es */
|
24 * 8, /* %es */
|
25 * 8, /* %fs */
|
25 * 8, /* %fs */
|
26 * 8 /* %gs */
|
26 * 8 /* %gs */
|
};
|
};
|
|
|
|
|
/* Support for signal handlers. */
|
/* Support for signal handlers. */
|
|
|
#define LINUX_SIGTRAMP_INSN0 0x48 /* mov $NNNNNNNN, %rax */
|
#define LINUX_SIGTRAMP_INSN0 0x48 /* mov $NNNNNNNN, %rax */
|
#define LINUX_SIGTRAMP_OFFSET0 0
|
#define LINUX_SIGTRAMP_OFFSET0 0
|
#define LINUX_SIGTRAMP_INSN1 0x0f /* syscall */
|
#define LINUX_SIGTRAMP_INSN1 0x0f /* syscall */
|
#define LINUX_SIGTRAMP_OFFSET1 7
|
#define LINUX_SIGTRAMP_OFFSET1 7
|
|
|
static const gdb_byte linux_sigtramp_code[] =
|
static const gdb_byte linux_sigtramp_code[] =
|
{
|
{
|
/* mov $__NR_rt_sigreturn, %rax */
|
/* mov $__NR_rt_sigreturn, %rax */
|
LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x0f, 0x00, 0x00, 0x00,
|
LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x0f, 0x00, 0x00, 0x00,
|
/* syscall */
|
/* syscall */
|
LINUX_SIGTRAMP_INSN1, 0x05
|
LINUX_SIGTRAMP_INSN1, 0x05
|
};
|
};
|
|
|
#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
|
#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
|
|
|
/* If PC is in a sigtramp routine, return the address of the start of
|
/* If PC is in a sigtramp routine, return the address of the start of
|
the routine. Otherwise, return 0. */
|
the routine. Otherwise, return 0. */
|
|
|
static CORE_ADDR
|
static CORE_ADDR
|
amd64_linux_sigtramp_start (struct frame_info *next_frame)
|
amd64_linux_sigtramp_start (struct frame_info *next_frame)
|
{
|
{
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
gdb_byte buf[LINUX_SIGTRAMP_LEN];
|
gdb_byte buf[LINUX_SIGTRAMP_LEN];
|
|
|
/* We only recognize a signal trampoline if PC is at the start of
|
/* 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
|
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
|
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
|
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
|
PC is not at the start of the instruction sequence, there will be
|
a few trailing readable bytes on the stack. */
|
a few trailing readable bytes on the stack. */
|
|
|
if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
|
if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
|
return 0;
|
return 0;
|
|
|
if (buf[0] != LINUX_SIGTRAMP_INSN0)
|
if (buf[0] != LINUX_SIGTRAMP_INSN0)
|
{
|
{
|
if (buf[0] != LINUX_SIGTRAMP_INSN1)
|
if (buf[0] != LINUX_SIGTRAMP_INSN1)
|
return 0;
|
return 0;
|
|
|
pc -= LINUX_SIGTRAMP_OFFSET1;
|
pc -= LINUX_SIGTRAMP_OFFSET1;
|
if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
|
if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
|
if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
|
return 0;
|
return 0;
|
|
|
return pc;
|
return pc;
|
}
|
}
|
|
|
/* Return whether the frame preceding NEXT_FRAME corresponds to a
|
/* Return whether the frame preceding NEXT_FRAME corresponds to a
|
GNU/Linux sigtramp routine. */
|
GNU/Linux sigtramp routine. */
|
|
|
static int
|
static int
|
amd64_linux_sigtramp_p (struct frame_info *next_frame)
|
amd64_linux_sigtramp_p (struct frame_info *next_frame)
|
{
|
{
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
char *name;
|
char *name;
|
|
|
find_pc_partial_function (pc, &name, NULL, NULL);
|
find_pc_partial_function (pc, &name, NULL, NULL);
|
|
|
/* If we have NAME, we can optimize the search. The trampoline is
|
/* If we have NAME, we can optimize the search. The trampoline is
|
named __restore_rt. However, it isn't dynamically exported from
|
named __restore_rt. However, it isn't dynamically exported from
|
the shared C library, so the trampoline may appear to be part of
|
the shared C library, so the trampoline may appear to be part of
|
the preceding function. This should always be sigaction,
|
the preceding function. This should always be sigaction,
|
__sigaction, or __libc_sigaction (all aliases to the same
|
__sigaction, or __libc_sigaction (all aliases to the same
|
function). */
|
function). */
|
if (name == NULL || strstr (name, "sigaction") != NULL)
|
if (name == NULL || strstr (name, "sigaction") != NULL)
|
return (amd64_linux_sigtramp_start (next_frame) != 0);
|
return (amd64_linux_sigtramp_start (next_frame) != 0);
|
|
|
return (strcmp ("__restore_rt", name) == 0);
|
return (strcmp ("__restore_rt", name) == 0);
|
}
|
}
|
|
|
/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
|
/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
|
#define AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 40
|
#define AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 40
|
|
|
/* Assuming NEXT_FRAME is a frame following a GNU/Linux sigtramp
|
/* Assuming NEXT_FRAME is a frame following a GNU/Linux sigtramp
|
routine, return the address of the associated sigcontext structure. */
|
routine, return the address of the associated sigcontext structure. */
|
|
|
static CORE_ADDR
|
static CORE_ADDR
|
amd64_linux_sigcontext_addr (struct frame_info *next_frame)
|
amd64_linux_sigcontext_addr (struct frame_info *next_frame)
|
{
|
{
|
CORE_ADDR sp;
|
CORE_ADDR sp;
|
gdb_byte buf[8];
|
gdb_byte buf[8];
|
|
|
frame_unwind_register (next_frame,
|
frame_unwind_register (next_frame,
|
gdbarch_sp_regnum (get_frame_arch (next_frame)), buf);
|
gdbarch_sp_regnum (get_frame_arch (next_frame)), buf);
|
sp = extract_unsigned_integer (buf, 8);
|
sp = extract_unsigned_integer (buf, 8);
|
|
|
/* The sigcontext structure is part of the user context. A pointer
|
/* The sigcontext structure is part of the user context. A pointer
|
to the user context is passed as the third argument to the signal
|
to the user context is passed as the third argument to the signal
|
handler, i.e. in %rdx. Unfortunately %rdx isn't preserved across
|
handler, i.e. in %rdx. Unfortunately %rdx isn't preserved across
|
function calls so we can't use it. Fortunately the user context
|
function calls so we can't use it. Fortunately the user context
|
is part of the signal frame and the unwound %rsp directly points
|
is part of the signal frame and the unwound %rsp directly points
|
at it. */
|
at it. */
|
return sp + AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
|
return sp + AMD64_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
|
}
|
}
|
|
|
|
|
/* From <asm/sigcontext.h>. */
|
/* From <asm/sigcontext.h>. */
|
static int amd64_linux_sc_reg_offset[] =
|
static int amd64_linux_sc_reg_offset[] =
|
{
|
{
|
13 * 8, /* %rax */
|
13 * 8, /* %rax */
|
11 * 8, /* %rbx */
|
11 * 8, /* %rbx */
|
14 * 8, /* %rcx */
|
14 * 8, /* %rcx */
|
12 * 8, /* %rdx */
|
12 * 8, /* %rdx */
|
9 * 8, /* %rsi */
|
9 * 8, /* %rsi */
|
8 * 8, /* %rdi */
|
8 * 8, /* %rdi */
|
10 * 8, /* %rbp */
|
10 * 8, /* %rbp */
|
15 * 8, /* %rsp */
|
15 * 8, /* %rsp */
|
0 * 8, /* %r8 */
|
0 * 8, /* %r8 */
|
1 * 8, /* %r9 */
|
1 * 8, /* %r9 */
|
2 * 8, /* %r10 */
|
2 * 8, /* %r10 */
|
3 * 8, /* %r11 */
|
3 * 8, /* %r11 */
|
4 * 8, /* %r12 */
|
4 * 8, /* %r12 */
|
5 * 8, /* %r13 */
|
5 * 8, /* %r13 */
|
6 * 8, /* %r14 */
|
6 * 8, /* %r14 */
|
7 * 8, /* %r15 */
|
7 * 8, /* %r15 */
|
16 * 8, /* %rip */
|
16 * 8, /* %rip */
|
17 * 8, /* %eflags */
|
17 * 8, /* %eflags */
|
|
|
/* FIXME: kettenis/2002030531: The registers %cs, %fs and %gs are
|
/* FIXME: kettenis/2002030531: The registers %cs, %fs and %gs are
|
available in `struct sigcontext'. However, they only occupy two
|
available in `struct sigcontext'. However, they only occupy two
|
bytes instead of four, which makes using them here rather
|
bytes instead of four, which makes using them here rather
|
difficult. Leave them out for now. */
|
difficult. Leave them out for now. */
|
-1, /* %cs */
|
-1, /* %cs */
|
-1, /* %ss */
|
-1, /* %ss */
|
-1, /* %ds */
|
-1, /* %ds */
|
-1, /* %es */
|
-1, /* %es */
|
-1, /* %fs */
|
-1, /* %fs */
|
-1 /* %gs */
|
-1 /* %gs */
|
};
|
};
|
|
|
/* Replacement register functions which know about %orig_rax. */
|
/* Replacement register functions which know about %orig_rax. */
|
|
|
static const char *
|
static const char *
|
amd64_linux_register_name (struct gdbarch *gdbarch, int reg)
|
amd64_linux_register_name (struct gdbarch *gdbarch, int reg)
|
{
|
{
|
if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
|
if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
|
return "orig_rax";
|
return "orig_rax";
|
|
|
return amd64_register_name (gdbarch, reg);
|
return amd64_register_name (gdbarch, reg);
|
}
|
}
|
|
|
static struct type *
|
static struct type *
|
amd64_linux_register_type (struct gdbarch *gdbarch, int reg)
|
amd64_linux_register_type (struct gdbarch *gdbarch, int reg)
|
{
|
{
|
if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
|
if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
|
return builtin_type_int64;
|
return builtin_type_int64;
|
|
|
return amd64_register_type (gdbarch, reg);
|
return amd64_register_type (gdbarch, reg);
|
}
|
}
|
|
|
static int
|
static int
|
amd64_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
|
amd64_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
|
struct reggroup *group)
|
struct reggroup *group)
|
{
|
{
|
if (regnum == AMD64_LINUX_ORIG_RAX_REGNUM)
|
if (regnum == AMD64_LINUX_ORIG_RAX_REGNUM)
|
return (group == system_reggroup
|
return (group == system_reggroup
|
|| group == save_reggroup
|
|| group == save_reggroup
|
|| group == restore_reggroup);
|
|| group == restore_reggroup);
|
return default_register_reggroup_p (gdbarch, regnum, group);
|
return default_register_reggroup_p (gdbarch, regnum, group);
|
}
|
}
|
|
|
/* Set the program counter for process PTID to PC. */
|
/* Set the program counter for process PTID to PC. */
|
|
|
static void
|
static void
|
amd64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
|
amd64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
|
{
|
{
|
regcache_cooked_write_unsigned (regcache, AMD64_RIP_REGNUM, pc);
|
regcache_cooked_write_unsigned (regcache, AMD64_RIP_REGNUM, pc);
|
|
|
/* We must be careful with modifying the program counter. If we
|
/* We must be careful with modifying the program counter. If we
|
just interrupted a system call, the kernel might try to restart
|
just interrupted a system call, the kernel might try to restart
|
it when we resume the inferior. On restarting the system call,
|
it when we resume the inferior. On restarting the system call,
|
the kernel will try backing up the program counter even though it
|
the kernel will try backing up the program counter even though it
|
no longer points at the system call. This typically results in a
|
no longer points at the system call. This typically results in a
|
SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
|
SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
|
"orig_rax" pseudo-register.
|
"orig_rax" pseudo-register.
|
|
|
Note that "orig_rax" is saved when setting up a dummy call frame.
|
Note that "orig_rax" is saved when setting up a dummy call frame.
|
This means that it is properly restored when that frame is
|
This means that it is properly restored when that frame is
|
popped, and that the interrupted system call will be restarted
|
popped, and that the interrupted system call will be restarted
|
when we resume the inferior on return from a function call from
|
when we resume the inferior on return from a function call from
|
within GDB. In all other cases the system call will not be
|
within GDB. In all other cases the system call will not be
|
restarted. */
|
restarted. */
|
regcache_cooked_write_unsigned (regcache, AMD64_LINUX_ORIG_RAX_REGNUM, -1);
|
regcache_cooked_write_unsigned (regcache, AMD64_LINUX_ORIG_RAX_REGNUM, -1);
|
}
|
}
|
|
|
static void
|
static void
|
amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
{
|
{
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
tdep->gregset_reg_offset = amd64_linux_gregset_reg_offset;
|
tdep->gregset_reg_offset = amd64_linux_gregset_reg_offset;
|
tdep->gregset_num_regs = ARRAY_SIZE (amd64_linux_gregset_reg_offset);
|
tdep->gregset_num_regs = ARRAY_SIZE (amd64_linux_gregset_reg_offset);
|
tdep->sizeof_gregset = 27 * 8;
|
tdep->sizeof_gregset = 27 * 8;
|
|
|
amd64_init_abi (info, gdbarch);
|
amd64_init_abi (info, gdbarch);
|
|
|
tdep->sigtramp_p = amd64_linux_sigtramp_p;
|
tdep->sigtramp_p = amd64_linux_sigtramp_p;
|
tdep->sigcontext_addr = amd64_linux_sigcontext_addr;
|
tdep->sigcontext_addr = amd64_linux_sigcontext_addr;
|
tdep->sc_reg_offset = amd64_linux_sc_reg_offset;
|
tdep->sc_reg_offset = amd64_linux_sc_reg_offset;
|
tdep->sc_num_regs = ARRAY_SIZE (amd64_linux_sc_reg_offset);
|
tdep->sc_num_regs = ARRAY_SIZE (amd64_linux_sc_reg_offset);
|
|
|
/* GNU/Linux uses SVR4-style shared libraries. */
|
/* GNU/Linux uses SVR4-style shared libraries. */
|
set_solib_svr4_fetch_link_map_offsets
|
set_solib_svr4_fetch_link_map_offsets
|
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
|
|
/* Add the %orig_rax register used for syscall restarting. */
|
/* Add the %orig_rax register used for syscall restarting. */
|
set_gdbarch_write_pc (gdbarch, amd64_linux_write_pc);
|
set_gdbarch_write_pc (gdbarch, amd64_linux_write_pc);
|
set_gdbarch_num_regs (gdbarch, AMD64_LINUX_NUM_REGS);
|
set_gdbarch_num_regs (gdbarch, AMD64_LINUX_NUM_REGS);
|
set_gdbarch_register_name (gdbarch, amd64_linux_register_name);
|
set_gdbarch_register_name (gdbarch, amd64_linux_register_name);
|
set_gdbarch_register_type (gdbarch, amd64_linux_register_type);
|
set_gdbarch_register_type (gdbarch, amd64_linux_register_type);
|
set_gdbarch_register_reggroup_p (gdbarch, amd64_linux_register_reggroup_p);
|
set_gdbarch_register_reggroup_p (gdbarch, amd64_linux_register_reggroup_p);
|
|
|
/* Enable TLS support. */
|
/* Enable TLS support. */
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
svr4_fetch_objfile_link_map);
|
svr4_fetch_objfile_link_map);
|
}
|
}
|
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
extern void _initialize_amd64_linux_tdep (void);
|
extern void _initialize_amd64_linux_tdep (void);
|
|
|
void
|
void
|
_initialize_amd64_linux_tdep (void)
|
_initialize_amd64_linux_tdep (void)
|
{
|
{
|
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
|
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
|
GDB_OSABI_LINUX, amd64_linux_init_abi);
|
GDB_OSABI_LINUX, amd64_linux_init_abi);
|
}
|
}
|
|
|