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binutils-gdb/gdb/i386-linux-tdep.c
Andrew Burgess c87df013cb gdb/i386/linux: fix possible register number conflict 
I noticed something that seemed really strange with the i386 register
numbering.

In i386-linux-tdep.h we setup I386_LINUX_ORIG_EAX_REGNUM based on
I386_PKRU_REGNUM.

However, in i386-tdep.h, enum i386_regnum ends like this:

  enum i386_regnum
  {
    ...
    I386_ZMM7H_REGNUM = I386_ZMM0H_REGNUM + 7,
    I386_PKRU_REGNUM,
    I386_PL3_SSP_REGNUM,
    I386_FSBASE_REGNUM,
    I386_GSBASE_REGNUM
  };

So I386_LINUX_ORIG_EAX_REGNUM will have the same value as
I386_PL3_SSP_REGNUM.

The I386_PL3_SSP_REGNUM was added in commit:

  commit 63b862be76
  AuthorDate: Fri Mar 29 16:38:50 2019 +0100
  CommitDate: Fri Aug 29 17:02:09 2025 +0000

      gdb, gdbserver: Add support of Intel shadow stack pointer register.

And before that, I386_FSBASE_REGNUM and I386_GSBASE_REGNUM were added
in commit:

  commit 1163a4b7a3
  AuthorDate: Tue Mar 12 13:39:02 2019 -0700
  CommitDate: Tue Mar 12 13:39:02 2019 -0700

      Support the fs_base and gs_base registers on i386.

So the SSP overlap is new, but the fs/gs base overlap has existed for
years, so why did it not cause any problems?

I think the explanation is that on i386, the fs/gs base are only used
for FreeBSD, all the calls to i386_target_description that pass true
for the segments argument are from fbsd files.  As a result, its fine
if there's numbering overlap between these i386 registers and some
Linux specific i386 registers.

OK, but what about the new SSP (shadow stack pointer) register?

I think in this case we would see problems, if the shadow stack was
supported for i386.  Here's what the docs say:

     The ‘org.gnu.gdb.i386.pl3_ssp’ feature is optional.  It should
  describe the user mode register ‘pl3_ssp’ which has 64 bits on amd64, 32
  bits on amd64 with 32-bit pointer size (X32) and 32 bits on i386.
  Following the restriction of the Linux kernel, only GDB for amd64
  targets makes use of this feature for now.

And indeed, if we look for callers of x86_supply_ssp, which supplies
the shadow stack pointer register, this is only called from amd64
specific code, either the native register fetching, or the core file
loading.  There's no calls from i386 code.

And so, again, we have register number overlap, but we avoid any
issues by not making use of these registers for i386 linux.

Here's my question: Is this super clever design aimed at saving 12
bytes (3 * 4-byte registers) of space in the i386 regcache?  Or is
this an accident where we happen to have gotten lucky?

If it's the first, then I really think there should be some comments
explaining what's going on.

If it's the second, then maybe we should fix this before it trips us
up?

This commit takes the second approach by doing the following:

  1. In i386-tdep.h move all the *_NUM_REGS constants to be members of
     'enum i386_regnum'.  The I386_NUM_REGS value can be automatically
     calculated based off the (current) last enum entry, and the
     other *_NUM_REGS constants are calculated just as they previously
     were, but are moved to keep them all together.

  2. In i386-linux-tdep.h, I386_LINUX_ORIG_EAX_REGNUM and
     I386_LINUX_NUM_REGS are moved into a new enum i386_linux_regnum,
     the name of which is inspired by i386_regnum with the addition
     of the linux tag.  The first entry in this new enum starts from
     I386_NUM_REGS rather than I386_PKRU_REGNUM.  The
     I386_LINUX_NUM_REGS will be calculated automatically by the
     compiler.

  3. In amd64-linux-nat.c, I extend amd64_linux_gregset32_reg_offset
     so that it now has entries for the 3 registers that are no longer
     aliasing, this stops an assert from the end of the file
     triggering:

     gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset)
                 == amd64_native_gregset32_num_regs);

     As I386_LINUX_NUM_REGS has now increased by 3.

  4. Given (3) I wondered why there was no assert being triggered from
     the i386 code as i386_linux_gregset_reg_offset, in i386-linux-tdep.c
     is clearly also wrong now.

     So, In i386-linux-tdep.c I've added a new assertion at the end of
     the file.

     And then I've fixed i386_linux_gregset_reg_offset by adding the 3
     new registers.

With these changes made I believe that the register number for the
$orig_eax register on i386 GNU/Linux targets should no longer be
aliasing with the SSP register.

For the reasons given above, I don't think this fixes any actual bugs,
it's more just a, lets not have unnecessary, and undocumented,
register number aliasing.

This change is visible using 'maint print registers', check out the
register number of $orig_eax before and after, it should now be +3
from where it was (changed from 72 to 75).

I did worry briefly about gdbservers that might not support XML target
descriptions and instead rely on a fixed GDB register numbering.
Though, if I'm honest, I have very little sympathy for such gdbservers
these days.  Still, they could, potentially be tripped up by this
change.  However, this is not the first time in recent years that the
value of I386_LINUX_ORIG_EAX_REGNUM has changed.  This commit also
adjusted the register number:

  commit 51547df62c
  Date:   Wed Feb 1 12:22:27 2017 +0100

      Add support for Intel PKRU register to GDB and GDBserver.

And I'm not aware of any bug reports that came from this, we certainly
didn't feel the need to adjust the register number back again.  So I'm
guessing that this renumbering will also go without issue.

Other than that, there should be no user visible changes after this
commit.

Reviewed-By: Christina Schimpe <christina.schimpe@intel.com>
2025-09-23 18:08:32 +01:00

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/* Target-dependent code for GNU/Linux i386.
Copyright (C) 2000-2025 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 "extract-store-integer.h"
#include "gdbcore.h"
#include "frame.h"
#include "value.h"
#include "regcache.h"
#include "regset.h"
#include "inferior.h"
#include "osabi.h"
#include "reggroups.h"
#include "dwarf2/frame.h"
#include "i386-tdep.h"
#include "i386-linux-tdep.h"
#include "linux-tdep.h"
#include "solib-svr4-linux.h"
#include "utils.h"
#include "glibc-tdep.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "arch-utils.h"
#include "xml-syscall.h"
#include "infrun.h"
#include "i387-tdep.h"
#include "gdbsupport/x86-xstate.h"
#include "arch/i386-linux-tdesc.h"
#include "arch/x86-linux-tdesc.h"
/* The syscall's XML filename for i386. */
#define XML_SYSCALL_FILENAME_I386 "syscalls/i386-linux.xml"
#include "record-full.h"
#include "linux-record.h"
#include "arch/i386.h"
#include "target-descriptions.h"
/* Return non-zero, when the register is in the corresponding register
group. Put the LINUX_ORIG_EAX register in the system group. */
static int
i386_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
const struct reggroup *group)
{
if (regnum == I386_LINUX_ORIG_EAX_REGNUM)
return (group == system_reggroup
|| group == save_reggroup
|| group == restore_reggroup);
return i386_register_reggroup_p (gdbarch, regnum, group);
}
/* Recognizing signal handler frames. */
/* GNU/Linux has two flavors of signals. Normal signal handlers, and
"realtime" (RT) signals. The RT signals can provide additional
information to the signal handler if the SA_SIGINFO flag is set
when establishing a signal handler using `sigaction'. It is not
unlikely that future versions of GNU/Linux will support SA_SIGINFO
for normal signals too. */
/* When the i386 Linux kernel calls a signal handler and the
SA_RESTORER flag isn't set, the return address points to a bit of
code on the stack. This function returns whether the PC appears to
be within this bit of code.
The instruction sequence for normal signals is
pop %eax
mov $0x77, %eax
int $0x80
or 0x58 0xb8 0x77 0x00 0x00 0x00 0xcd 0x80.
Checking for the code sequence should be somewhat reliable, because
the effect is to call the system call sigreturn. This is unlikely
to occur anywhere other than in a signal trampoline.
It kind of sucks that we have to read memory from the process in
order to identify a signal trampoline, but there doesn't seem to be
any other way. Therefore we only do the memory reads if no
function name could be identified, which should be the case since
the code is on the stack.
Detection of signal trampolines for handlers that set the
SA_RESTORER flag is in general not possible. Unfortunately this is
what the GNU C Library has been doing for quite some time now.
However, as of version 2.1.2, the GNU C Library uses signal
trampolines (named __restore and __restore_rt) that are identical
to the ones used by the kernel. Therefore, these trampolines are
supported too. */
#define LINUX_SIGTRAMP_INSN0 0x58 /* pop %eax */
#define LINUX_SIGTRAMP_OFFSET0 0
#define LINUX_SIGTRAMP_INSN1 0xb8 /* mov $NNNN, %eax */
#define LINUX_SIGTRAMP_OFFSET1 1
#define LINUX_SIGTRAMP_INSN2 0xcd /* int */
#define LINUX_SIGTRAMP_OFFSET2 6
static const gdb_byte linux_sigtramp_code[] =
{
LINUX_SIGTRAMP_INSN0, /* pop %eax */
LINUX_SIGTRAMP_INSN1, 0x77, 0x00, 0x00, 0x00, /* mov $0x77, %eax */
LINUX_SIGTRAMP_INSN2, 0x80 /* int $0x80 */
};
#define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code)
/* If THIS_FRAME is a sigtramp routine, return the address of the
start of the routine. Otherwise, return 0. */
static CORE_ADDR
i386_linux_sigtramp_start (const frame_info_ptr &this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
gdb_byte buf[LINUX_SIGTRAMP_LEN];
/* We only recognize a signal trampoline if PC is at the start of
one of the three 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 (this_frame, pc, buf))
return 0;
if (buf[0] != LINUX_SIGTRAMP_INSN0)
{
int adjust;
switch (buf[0])
{
case LINUX_SIGTRAMP_INSN1:
adjust = LINUX_SIGTRAMP_OFFSET1;
break;
case LINUX_SIGTRAMP_INSN2:
adjust = LINUX_SIGTRAMP_OFFSET2;
break;
default:
return 0;
}
pc -= adjust;
if (!safe_frame_unwind_memory (this_frame, pc, buf))
return 0;
}
if (memcmp (buf, linux_sigtramp_code, LINUX_SIGTRAMP_LEN) != 0)
return 0;
return pc;
}
/* This function does the same for RT signals. Here the instruction
sequence is
mov $0xad, %eax
int $0x80
or 0xb8 0xad 0x00 0x00 0x00 0xcd 0x80.
The effect is to call the system call rt_sigreturn. */
#define LINUX_RT_SIGTRAMP_INSN0 0xb8 /* mov $NNNN, %eax */
#define LINUX_RT_SIGTRAMP_OFFSET0 0
#define LINUX_RT_SIGTRAMP_INSN1 0xcd /* int */
#define LINUX_RT_SIGTRAMP_OFFSET1 5
static const gdb_byte linux_rt_sigtramp_code[] =
{
LINUX_RT_SIGTRAMP_INSN0, 0xad, 0x00, 0x00, 0x00, /* mov $0xad, %eax */
LINUX_RT_SIGTRAMP_INSN1, 0x80 /* int $0x80 */
};
#define LINUX_RT_SIGTRAMP_LEN (sizeof linux_rt_sigtramp_code)
/* If THIS_FRAME is an RT sigtramp routine, return the address of the
start of the routine. Otherwise, return 0. */
static CORE_ADDR
i386_linux_rt_sigtramp_start (const frame_info_ptr &this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
gdb_byte buf[LINUX_RT_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 (this_frame, pc, buf))
return 0;
if (buf[0] != LINUX_RT_SIGTRAMP_INSN0)
{
if (buf[0] != LINUX_RT_SIGTRAMP_INSN1)
return 0;
pc -= LINUX_RT_SIGTRAMP_OFFSET1;
if (!safe_frame_unwind_memory (this_frame, pc,
buf))
return 0;
}
if (memcmp (buf, linux_rt_sigtramp_code, LINUX_RT_SIGTRAMP_LEN) != 0)
return 0;
return pc;
}
/* Return whether THIS_FRAME corresponds to a GNU/Linux sigtramp
routine. */
static int
i386_linux_sigtramp_p (const frame_info_ptr &this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
/* If we have NAME, we can optimize the search. The trampolines are
named __restore and __restore_rt. However, they aren'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 (i386_linux_sigtramp_start (this_frame) != 0
|| i386_linux_rt_sigtramp_start (this_frame) != 0);
return (strcmp ("__restore", name) == 0
|| strcmp ("__restore_rt", name) == 0);
}
/* Return one if the PC of THIS_FRAME is in a signal trampoline which
may have DWARF-2 CFI. */
static int
i386_linux_dwarf_signal_frame_p (struct gdbarch *gdbarch,
const frame_info_ptr &this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
const char *name;
find_pc_partial_function (pc, &name, NULL, NULL);
/* If a vsyscall DSO is in use, the signal trampolines may have these
names. */
if (name && (strcmp (name, "__kernel_sigreturn") == 0
|| strcmp (name, "__kernel_rt_sigreturn") == 0))
return 1;
return 0;
}
/* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */
#define I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET 20
/* Assuming THIS_FRAME is a GNU/Linux sigtramp routine, return the
address of the associated sigcontext structure. */
static CORE_ADDR
i386_linux_sigcontext_addr (const frame_info_ptr &this_frame)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR pc;
CORE_ADDR sp;
gdb_byte buf[4];
get_frame_register (this_frame, I386_ESP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4, byte_order);
pc = i386_linux_sigtramp_start (this_frame);
if (pc)
{
/* The sigcontext structure lives on the stack, right after
the signum argument. We determine the address of the
sigcontext structure by looking at the frame's stack
pointer. Keep in mind that the first instruction of the
sigtramp code is "pop %eax". If the PC is after this
instruction, adjust the returned value accordingly. */
if (pc == get_frame_pc (this_frame))
return sp + 4;
return sp;
}
pc = i386_linux_rt_sigtramp_start (this_frame);
if (pc)
{
CORE_ADDR ucontext_addr;
/* 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. */
read_memory (sp + 8, buf, 4);
ucontext_addr = extract_unsigned_integer (buf, 4, byte_order);
return ucontext_addr + I386_LINUX_UCONTEXT_SIGCONTEXT_OFFSET;
}
error (_("Couldn't recognize signal trampoline."));
return 0;
}
/* Set the program counter for process PTID to PC. */
static void
i386_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
regcache_cooked_write_unsigned (regcache, I386_EIP_REGNUM, pc);
/* We must be careful with modifying the program counter. If we
just interrupted a system call, the kernel might try to restart
it when we resume the inferior. On restarting the system call,
the kernel will try backing up the program counter even though it
no longer points at the system call. This typically results in a
SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
"orig_eax" pseudo-register.
Note that "orig_eax" is saved when setting up a dummy call frame.
This means that it is properly restored when that frame is
popped, and that the interrupted system call will be restarted
when we resume the inferior on return from a function call from
within GDB. In all other cases the system call will not be
restarted. */
regcache_cooked_write_unsigned (regcache, I386_LINUX_ORIG_EAX_REGNUM, -1);
}
/* Record all registers but IP register for process-record. */
static int
i386_all_but_ip_registers_record (struct regcache *regcache)
{
if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_ECX_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EDX_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EBX_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_ESP_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EBP_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_ESI_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EDI_REGNUM))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EFLAGS_REGNUM))
return -1;
return 0;
}
enum i386_syscall
{
#define SYSCALL(NUMBER,NAME) \
i386_sys_ ## NAME = NUMBER,
#include "gdb/i386-syscalls.def"
#undef SYSCALL
};
/* i386_canonicalize_syscall maps from the native i386 Linux set
of syscall ids into a canonical set of syscall ids used by
process record (a mostly trivial mapping, since the canonical
set was originally taken from the i386 set). */
static enum gdb_syscall
i386_canonicalize_syscall (int syscall)
{
switch ((enum i386_syscall) syscall)
{
#define SYSCALL_MAP(SYSCALL) \
case i386_sys_ ## SYSCALL: \
return gdb_sys_ ## SYSCALL
#define SYSCALL_MAP_RENAME(SYSCALL,GDB_SYSCALL) \
case i386_sys_##SYSCALL: \
return GDB_SYSCALL;
#define UNSUPPORTED_SYSCALL_MAP(SYSCALL) \
case i386_sys_ ## SYSCALL: \
return gdb_sys_no_syscall;
SYSCALL_MAP (restart_syscall);
SYSCALL_MAP (exit);
SYSCALL_MAP (fork);
SYSCALL_MAP (read);
SYSCALL_MAP (write);
SYSCALL_MAP (open);
SYSCALL_MAP (close);
SYSCALL_MAP (waitpid);
SYSCALL_MAP (creat);
SYSCALL_MAP (link);
SYSCALL_MAP (unlink);
SYSCALL_MAP (execve);
SYSCALL_MAP (chdir);
SYSCALL_MAP (time);
SYSCALL_MAP (mknod);
SYSCALL_MAP (chmod);
SYSCALL_MAP_RENAME (lchown, gdb_sys_lchown16);
SYSCALL_MAP_RENAME (break, gdb_sys_ni_syscall17);
SYSCALL_MAP_RENAME (oldstat, gdb_sys_stat);
SYSCALL_MAP (lseek);
SYSCALL_MAP (getpid);
SYSCALL_MAP (mount);
SYSCALL_MAP_RENAME (umount, gdb_sys_oldumount);
SYSCALL_MAP_RENAME (setuid, gdb_sys_setuid16);
SYSCALL_MAP_RENAME (getuid, gdb_sys_getuid16);
SYSCALL_MAP (stime);
SYSCALL_MAP (ptrace);
SYSCALL_MAP (alarm);
SYSCALL_MAP_RENAME (oldfstat, gdb_sys_fstat);
SYSCALL_MAP (pause);
SYSCALL_MAP (utime);
SYSCALL_MAP_RENAME (stty, gdb_sys_ni_syscall31);
SYSCALL_MAP_RENAME (gtty, gdb_sys_ni_syscall32);
SYSCALL_MAP (access);
SYSCALL_MAP (nice);
SYSCALL_MAP_RENAME (ftime, gdb_sys_ni_syscall35);
SYSCALL_MAP (sync);
SYSCALL_MAP (kill);
SYSCALL_MAP (rename);
SYSCALL_MAP (mkdir);
SYSCALL_MAP (rmdir);
SYSCALL_MAP (dup);
SYSCALL_MAP (pipe);
SYSCALL_MAP (times);
SYSCALL_MAP_RENAME (prof, gdb_sys_ni_syscall44);
SYSCALL_MAP (brk);
SYSCALL_MAP_RENAME (setgid, gdb_sys_setgid16);
SYSCALL_MAP_RENAME (getgid, gdb_sys_getgid16);
SYSCALL_MAP (signal);
SYSCALL_MAP_RENAME (geteuid, gdb_sys_geteuid16);
SYSCALL_MAP_RENAME (getegid, gdb_sys_getegid16);
SYSCALL_MAP (acct);
SYSCALL_MAP_RENAME (umount2, gdb_sys_umount);
SYSCALL_MAP_RENAME (lock, gdb_sys_ni_syscall53);
SYSCALL_MAP (ioctl);
SYSCALL_MAP (fcntl);
SYSCALL_MAP_RENAME (mpx, gdb_sys_ni_syscall56);
SYSCALL_MAP (setpgid);
SYSCALL_MAP_RENAME (ulimit, gdb_sys_ni_syscall58);
SYSCALL_MAP_RENAME (oldolduname, gdb_sys_olduname);
SYSCALL_MAP (umask);
SYSCALL_MAP (chroot);
SYSCALL_MAP (ustat);
SYSCALL_MAP (dup2);
SYSCALL_MAP (getppid);
SYSCALL_MAP (getpgrp);
SYSCALL_MAP (setsid);
SYSCALL_MAP (sigaction);
SYSCALL_MAP (sgetmask);
SYSCALL_MAP (ssetmask);
SYSCALL_MAP_RENAME (setreuid, gdb_sys_setreuid16);
SYSCALL_MAP_RENAME (setregid, gdb_sys_setregid16);
SYSCALL_MAP (sigsuspend);
SYSCALL_MAP (sigpending);
SYSCALL_MAP (sethostname);
SYSCALL_MAP (setrlimit);
SYSCALL_MAP_RENAME (getrlimit, gdb_sys_old_getrlimit);
SYSCALL_MAP (getrusage);
SYSCALL_MAP (gettimeofday);
SYSCALL_MAP (settimeofday);
SYSCALL_MAP_RENAME (getgroups, gdb_sys_getgroups16);
SYSCALL_MAP_RENAME (setgroups, gdb_sys_setgroups16);
SYSCALL_MAP_RENAME (select, gdb_sys_old_select);
SYSCALL_MAP (symlink);
SYSCALL_MAP_RENAME (oldlstat, gdb_sys_lstat);
SYSCALL_MAP (readlink);
SYSCALL_MAP (uselib);
SYSCALL_MAP (swapon);
SYSCALL_MAP (reboot);
SYSCALL_MAP_RENAME (readdir, gdb_sys_old_readdir);
SYSCALL_MAP_RENAME (mmap, gdb_sys_old_mmap);
SYSCALL_MAP (munmap);
SYSCALL_MAP (truncate);
SYSCALL_MAP (ftruncate);
SYSCALL_MAP (fchmod);
SYSCALL_MAP_RENAME (fchown, gdb_sys_fchown16);
SYSCALL_MAP (getpriority);
SYSCALL_MAP (setpriority);
SYSCALL_MAP_RENAME (profil, gdb_sys_ni_syscall98);
SYSCALL_MAP (statfs);
SYSCALL_MAP (fstatfs);
SYSCALL_MAP (ioperm);
SYSCALL_MAP (socketcall);
SYSCALL_MAP (syslog);
SYSCALL_MAP (setitimer);
SYSCALL_MAP (getitimer);
SYSCALL_MAP_RENAME (stat, gdb_sys_newstat);
SYSCALL_MAP_RENAME (lstat, gdb_sys_newlstat);
SYSCALL_MAP_RENAME (fstat, gdb_sys_newfstat);
SYSCALL_MAP_RENAME (olduname, gdb_sys_uname);
SYSCALL_MAP (iopl);
SYSCALL_MAP (vhangup);
SYSCALL_MAP_RENAME (idle, gdb_sys_ni_syscall112);
SYSCALL_MAP (vm86old);
SYSCALL_MAP (wait4);
SYSCALL_MAP (swapoff);
SYSCALL_MAP (sysinfo);
SYSCALL_MAP (ipc);
SYSCALL_MAP (fsync);
SYSCALL_MAP (sigreturn);
SYSCALL_MAP (clone);
SYSCALL_MAP (setdomainname);
SYSCALL_MAP_RENAME (uname, gdb_sys_newuname);
SYSCALL_MAP (modify_ldt);
SYSCALL_MAP (adjtimex);
SYSCALL_MAP (mprotect);
SYSCALL_MAP (sigprocmask);
SYSCALL_MAP_RENAME (create_module, gdb_sys_ni_syscall127);
SYSCALL_MAP (init_module);
SYSCALL_MAP (delete_module);
SYSCALL_MAP_RENAME (get_kernel_syms, gdb_sys_ni_syscall130);
SYSCALL_MAP (quotactl);
SYSCALL_MAP (getpgid);
SYSCALL_MAP (fchdir);
SYSCALL_MAP (bdflush);
SYSCALL_MAP (sysfs);
SYSCALL_MAP (personality);
SYSCALL_MAP_RENAME (afs_syscall, gdb_sys_ni_syscall137);
SYSCALL_MAP_RENAME (setfsuid, gdb_sys_setfsuid16);
SYSCALL_MAP_RENAME (setfsgid, gdb_sys_setfsgid16);
SYSCALL_MAP_RENAME (_llseek, gdb_sys_llseek);
SYSCALL_MAP (getdents);
SYSCALL_MAP_RENAME (_newselect, gdb_sys_select);
SYSCALL_MAP (flock);
SYSCALL_MAP (msync);
SYSCALL_MAP (readv);
SYSCALL_MAP (writev);
SYSCALL_MAP (getsid);
SYSCALL_MAP (fdatasync);
SYSCALL_MAP_RENAME (_sysctl, gdb_sys_sysctl);
SYSCALL_MAP (mlock);
SYSCALL_MAP (munlock);
SYSCALL_MAP (mlockall);
SYSCALL_MAP (munlockall);
SYSCALL_MAP (sched_setparam);
SYSCALL_MAP (sched_getparam);
SYSCALL_MAP (sched_setscheduler);
SYSCALL_MAP (sched_getscheduler);
SYSCALL_MAP (sched_yield);
SYSCALL_MAP (sched_get_priority_max);
SYSCALL_MAP (sched_get_priority_min);
SYSCALL_MAP (sched_rr_get_interval);
SYSCALL_MAP (nanosleep);
SYSCALL_MAP (mremap);
SYSCALL_MAP_RENAME (setresuid, gdb_sys_setresuid16);
SYSCALL_MAP_RENAME (getresuid, gdb_sys_getresuid16);
SYSCALL_MAP (vm86);
SYSCALL_MAP_RENAME (query_module, gdb_sys_ni_syscall167);
SYSCALL_MAP (poll);
SYSCALL_MAP (nfsservctl);
SYSCALL_MAP_RENAME (setresgid, gdb_sys_setresgid16);
SYSCALL_MAP_RENAME (getresgid, gdb_sys_getresgid16);
SYSCALL_MAP (prctl);
SYSCALL_MAP (rt_sigreturn);
SYSCALL_MAP (rt_sigaction);
SYSCALL_MAP (rt_sigprocmask);
SYSCALL_MAP (rt_sigpending);
SYSCALL_MAP (rt_sigtimedwait);
SYSCALL_MAP (rt_sigqueueinfo);
SYSCALL_MAP (rt_sigsuspend);
SYSCALL_MAP (pread64);
SYSCALL_MAP (pwrite64);
SYSCALL_MAP_RENAME (chown, gdb_sys_chown16);
SYSCALL_MAP (getcwd);
SYSCALL_MAP (capget);
SYSCALL_MAP (capset);
SYSCALL_MAP (sigaltstack);
SYSCALL_MAP (sendfile);
SYSCALL_MAP_RENAME (getpmsg, gdb_sys_ni_syscall188);
SYSCALL_MAP_RENAME (putpmsg, gdb_sys_ni_syscall189);
SYSCALL_MAP (vfork);
SYSCALL_MAP_RENAME (ugetrlimit, gdb_sys_getrlimit);
SYSCALL_MAP (mmap2);
SYSCALL_MAP (truncate64);
SYSCALL_MAP (ftruncate64);
SYSCALL_MAP (stat64);
SYSCALL_MAP (lstat64);
SYSCALL_MAP (fstat64);
SYSCALL_MAP_RENAME (lchown32, gdb_sys_lchown);
SYSCALL_MAP_RENAME (getuid32, gdb_sys_getuid);
SYSCALL_MAP_RENAME (getgid32, gdb_sys_getgid);
SYSCALL_MAP_RENAME (geteuid32, gdb_sys_geteuid);
SYSCALL_MAP_RENAME (getegid32, gdb_sys_getegid);
SYSCALL_MAP_RENAME (setreuid32, gdb_sys_setreuid);
SYSCALL_MAP_RENAME (setregid32, gdb_sys_setregid);
SYSCALL_MAP_RENAME (getgroups32, gdb_sys_getgroups);
SYSCALL_MAP_RENAME (setgroups32, gdb_sys_setgroups);
SYSCALL_MAP_RENAME (fchown32, gdb_sys_fchown);
SYSCALL_MAP_RENAME (setresuid32, gdb_sys_setresuid);
SYSCALL_MAP_RENAME (getresuid32, gdb_sys_getresuid);
SYSCALL_MAP_RENAME (setresgid32, gdb_sys_setresgid);
SYSCALL_MAP_RENAME (getresgid32, gdb_sys_getresgid);
SYSCALL_MAP_RENAME (chown32, gdb_sys_chown);
SYSCALL_MAP_RENAME (setuid32, gdb_sys_setuid);
SYSCALL_MAP_RENAME (setgid32, gdb_sys_setgid);
SYSCALL_MAP_RENAME (setfsuid32, gdb_sys_setfsuid);
SYSCALL_MAP_RENAME (setfsgid32, gdb_sys_setfsgid);
SYSCALL_MAP (pivot_root);
SYSCALL_MAP (mincore);
SYSCALL_MAP (madvise);
SYSCALL_MAP (getdents64);
SYSCALL_MAP (fcntl64);
SYSCALL_MAP (gettid);
SYSCALL_MAP (readahead);
SYSCALL_MAP (setxattr);
SYSCALL_MAP (lsetxattr);
SYSCALL_MAP (fsetxattr);
SYSCALL_MAP (getxattr);
SYSCALL_MAP (lgetxattr);
SYSCALL_MAP (fgetxattr);
SYSCALL_MAP (listxattr);
SYSCALL_MAP (llistxattr);
SYSCALL_MAP (flistxattr);
SYSCALL_MAP (removexattr);
SYSCALL_MAP (lremovexattr);
SYSCALL_MAP (fremovexattr);
SYSCALL_MAP (tkill);
SYSCALL_MAP (sendfile64);
SYSCALL_MAP (futex);
SYSCALL_MAP (sched_setaffinity);
SYSCALL_MAP (sched_getaffinity);
SYSCALL_MAP (set_thread_area);
SYSCALL_MAP (get_thread_area);
SYSCALL_MAP (io_setup);
SYSCALL_MAP (io_destroy);
SYSCALL_MAP (io_getevents);
SYSCALL_MAP (io_submit);
SYSCALL_MAP (io_cancel);
SYSCALL_MAP (fadvise64);
SYSCALL_MAP (exit_group);
SYSCALL_MAP (lookup_dcookie);
SYSCALL_MAP (epoll_create);
SYSCALL_MAP (epoll_ctl);
SYSCALL_MAP (epoll_wait);
SYSCALL_MAP (remap_file_pages);
SYSCALL_MAP (set_tid_address);
SYSCALL_MAP (timer_create);
SYSCALL_MAP (timer_settime);
SYSCALL_MAP (timer_gettime);
SYSCALL_MAP (timer_getoverrun);
SYSCALL_MAP (timer_delete);
SYSCALL_MAP (clock_settime);
SYSCALL_MAP (clock_gettime);
SYSCALL_MAP (clock_getres);
SYSCALL_MAP (clock_nanosleep);
SYSCALL_MAP (statfs64);
SYSCALL_MAP (fstatfs64);
SYSCALL_MAP (tgkill);
SYSCALL_MAP (utimes);
SYSCALL_MAP (fadvise64_64);
SYSCALL_MAP_RENAME (vserver, gdb_sys_ni_syscall273);
SYSCALL_MAP (mbind);
SYSCALL_MAP (get_mempolicy);
SYSCALL_MAP (set_mempolicy);
SYSCALL_MAP (mq_open);
SYSCALL_MAP (mq_unlink);
SYSCALL_MAP (mq_timedsend);
SYSCALL_MAP (mq_timedreceive);
SYSCALL_MAP (mq_notify);
SYSCALL_MAP (mq_getsetattr);
SYSCALL_MAP (kexec_load);
SYSCALL_MAP (waitid);
SYSCALL_MAP (add_key);
SYSCALL_MAP (request_key);
SYSCALL_MAP (keyctl);
SYSCALL_MAP (ioprio_set);
SYSCALL_MAP (ioprio_get);
SYSCALL_MAP (inotify_init);
SYSCALL_MAP (inotify_add_watch);
SYSCALL_MAP (inotify_rm_watch);
SYSCALL_MAP (migrate_pages);
SYSCALL_MAP (openat);
SYSCALL_MAP (mkdirat);
SYSCALL_MAP (mknodat);
SYSCALL_MAP (fchownat);
SYSCALL_MAP (futimesat);
SYSCALL_MAP (fstatat64);
SYSCALL_MAP (unlinkat);
SYSCALL_MAP (renameat);
SYSCALL_MAP (linkat);
SYSCALL_MAP (symlinkat);
SYSCALL_MAP (readlinkat);
SYSCALL_MAP (fchmodat);
SYSCALL_MAP (faccessat);
SYSCALL_MAP (pselect6);
SYSCALL_MAP (ppoll);
SYSCALL_MAP (unshare);
SYSCALL_MAP (set_robust_list);
SYSCALL_MAP (get_robust_list);
SYSCALL_MAP (splice);
SYSCALL_MAP (sync_file_range);
SYSCALL_MAP (tee);
SYSCALL_MAP (vmsplice);
SYSCALL_MAP (move_pages);
SYSCALL_MAP (getcpu);
SYSCALL_MAP (epoll_pwait);
UNSUPPORTED_SYSCALL_MAP (utimensat);
UNSUPPORTED_SYSCALL_MAP (signalfd);
UNSUPPORTED_SYSCALL_MAP (timerfd_create);
UNSUPPORTED_SYSCALL_MAP (eventfd);
SYSCALL_MAP (fallocate);
UNSUPPORTED_SYSCALL_MAP (timerfd_settime);
UNSUPPORTED_SYSCALL_MAP (timerfd_gettime);
UNSUPPORTED_SYSCALL_MAP (signalfd4);
SYSCALL_MAP (eventfd2);
SYSCALL_MAP (epoll_create1);
SYSCALL_MAP (dup3);
SYSCALL_MAP (pipe2);
SYSCALL_MAP (inotify_init1);
UNSUPPORTED_SYSCALL_MAP (preadv);
UNSUPPORTED_SYSCALL_MAP (pwritev);
UNSUPPORTED_SYSCALL_MAP (rt_tgsigqueueinfo);
UNSUPPORTED_SYSCALL_MAP (perf_event_open);
UNSUPPORTED_SYSCALL_MAP (recvmmsg);
UNSUPPORTED_SYSCALL_MAP (fanotify_init);
UNSUPPORTED_SYSCALL_MAP (fanotify_mark);
UNSUPPORTED_SYSCALL_MAP (prlimit64);
UNSUPPORTED_SYSCALL_MAP (name_to_handle_at);
UNSUPPORTED_SYSCALL_MAP (open_by_handle_at);
UNSUPPORTED_SYSCALL_MAP (clock_adjtime);
UNSUPPORTED_SYSCALL_MAP (syncfs);
UNSUPPORTED_SYSCALL_MAP (sendmmsg);
UNSUPPORTED_SYSCALL_MAP (setns);
UNSUPPORTED_SYSCALL_MAP (process_vm_readv);
UNSUPPORTED_SYSCALL_MAP (process_vm_writev);
UNSUPPORTED_SYSCALL_MAP (kcmp);
UNSUPPORTED_SYSCALL_MAP (finit_module);
UNSUPPORTED_SYSCALL_MAP (sched_setattr);
UNSUPPORTED_SYSCALL_MAP (sched_getattr);
UNSUPPORTED_SYSCALL_MAP (renameat2);
UNSUPPORTED_SYSCALL_MAP (seccomp);
SYSCALL_MAP (getrandom);
UNSUPPORTED_SYSCALL_MAP (memfd_create);
UNSUPPORTED_SYSCALL_MAP (bpf);
UNSUPPORTED_SYSCALL_MAP (execveat);
SYSCALL_MAP (socket);
SYSCALL_MAP (socketpair);
SYSCALL_MAP (bind);
SYSCALL_MAP (connect);
SYSCALL_MAP (listen);
SYSCALL_MAP (accept4);
SYSCALL_MAP (getsockopt);
SYSCALL_MAP (setsockopt);
SYSCALL_MAP (getsockname);
SYSCALL_MAP (getpeername);
SYSCALL_MAP (sendto);
SYSCALL_MAP (sendmsg);
SYSCALL_MAP (recvfrom);
SYSCALL_MAP (recvmsg);
SYSCALL_MAP (shutdown);
UNSUPPORTED_SYSCALL_MAP (userfaultfd);
UNSUPPORTED_SYSCALL_MAP (membarrier);
UNSUPPORTED_SYSCALL_MAP (mlock2);
UNSUPPORTED_SYSCALL_MAP (copy_file_range);
UNSUPPORTED_SYSCALL_MAP (preadv2);
UNSUPPORTED_SYSCALL_MAP (pwritev2);
UNSUPPORTED_SYSCALL_MAP (pkey_mprotect);
UNSUPPORTED_SYSCALL_MAP (pkey_alloc);
UNSUPPORTED_SYSCALL_MAP (pkey_free);
SYSCALL_MAP (statx);
UNSUPPORTED_SYSCALL_MAP (arch_prctl);
UNSUPPORTED_SYSCALL_MAP (io_pgetevents);
UNSUPPORTED_SYSCALL_MAP (rseq);
SYSCALL_MAP (semget);
SYSCALL_MAP (semctl);
SYSCALL_MAP (shmget);
SYSCALL_MAP (shmctl);
SYSCALL_MAP (shmat);
SYSCALL_MAP (shmdt);
SYSCALL_MAP (msgget);
SYSCALL_MAP (msgsnd);
SYSCALL_MAP (msgrcv);
SYSCALL_MAP (msgctl);
SYSCALL_MAP (clock_gettime64);
UNSUPPORTED_SYSCALL_MAP (clock_settime64);
UNSUPPORTED_SYSCALL_MAP (clock_adjtime64);
UNSUPPORTED_SYSCALL_MAP (clock_getres_time64);
UNSUPPORTED_SYSCALL_MAP (clock_nanosleep_time64);
UNSUPPORTED_SYSCALL_MAP (timer_gettime64);
UNSUPPORTED_SYSCALL_MAP (timer_settime64);
UNSUPPORTED_SYSCALL_MAP (timerfd_gettime64);
UNSUPPORTED_SYSCALL_MAP (timerfd_settime64);
UNSUPPORTED_SYSCALL_MAP (utimensat_time64);
UNSUPPORTED_SYSCALL_MAP (pselect6_time64);
UNSUPPORTED_SYSCALL_MAP (ppoll_time64);
UNSUPPORTED_SYSCALL_MAP (io_pgetevents_time64);
UNSUPPORTED_SYSCALL_MAP (recvmmsg_time64);
UNSUPPORTED_SYSCALL_MAP (mq_timedsend_time64);
UNSUPPORTED_SYSCALL_MAP (mq_timedreceive_time64);
SYSCALL_MAP_RENAME (semtimedop_time64, gdb_sys_semtimedop);
UNSUPPORTED_SYSCALL_MAP (rt_sigtimedwait_time64);
UNSUPPORTED_SYSCALL_MAP (futex_time64);
UNSUPPORTED_SYSCALL_MAP (sched_rr_get_interval_time64);
UNSUPPORTED_SYSCALL_MAP (pidfd_send_signal);
UNSUPPORTED_SYSCALL_MAP (io_uring_setup);
UNSUPPORTED_SYSCALL_MAP (io_uring_enter);
UNSUPPORTED_SYSCALL_MAP (io_uring_register);
UNSUPPORTED_SYSCALL_MAP (open_tree);
UNSUPPORTED_SYSCALL_MAP (move_mount);
UNSUPPORTED_SYSCALL_MAP (fsopen);
UNSUPPORTED_SYSCALL_MAP (fsconfig);
UNSUPPORTED_SYSCALL_MAP (fsmount);
UNSUPPORTED_SYSCALL_MAP (fspick);
UNSUPPORTED_SYSCALL_MAP (pidfd_open);
UNSUPPORTED_SYSCALL_MAP (clone3);
UNSUPPORTED_SYSCALL_MAP (close_range);
UNSUPPORTED_SYSCALL_MAP (openat2);
UNSUPPORTED_SYSCALL_MAP (pidfd_getfd);
UNSUPPORTED_SYSCALL_MAP (faccessat2);
UNSUPPORTED_SYSCALL_MAP (process_madvise);
UNSUPPORTED_SYSCALL_MAP (epoll_pwait2);
UNSUPPORTED_SYSCALL_MAP (mount_setattr);
UNSUPPORTED_SYSCALL_MAP (quotactl_fd);
UNSUPPORTED_SYSCALL_MAP (landlock_create_ruleset);
UNSUPPORTED_SYSCALL_MAP (landlock_add_rule);
UNSUPPORTED_SYSCALL_MAP (landlock_restrict_self);
UNSUPPORTED_SYSCALL_MAP (memfd_secret);
UNSUPPORTED_SYSCALL_MAP (process_mrelease);
UNSUPPORTED_SYSCALL_MAP (futex_waitv);
UNSUPPORTED_SYSCALL_MAP (set_mempolicy_home_node);
UNSUPPORTED_SYSCALL_MAP (cachestat);
UNSUPPORTED_SYSCALL_MAP (fchmodat2);
UNSUPPORTED_SYSCALL_MAP (map_shadow_stack);
UNSUPPORTED_SYSCALL_MAP (futex_wake);
UNSUPPORTED_SYSCALL_MAP (futex_wait);
UNSUPPORTED_SYSCALL_MAP (futex_requeue);
UNSUPPORTED_SYSCALL_MAP (statmount);
UNSUPPORTED_SYSCALL_MAP (listmount);
UNSUPPORTED_SYSCALL_MAP (lsm_get_self_attr);
UNSUPPORTED_SYSCALL_MAP (lsm_set_self_attr);
UNSUPPORTED_SYSCALL_MAP (lsm_list_modules);
UNSUPPORTED_SYSCALL_MAP (mseal);
UNSUPPORTED_SYSCALL_MAP (setxattrat);
UNSUPPORTED_SYSCALL_MAP (getxattrat);
UNSUPPORTED_SYSCALL_MAP (listxattrat);
UNSUPPORTED_SYSCALL_MAP (removexattrat);
#undef SYSCALL_MAP
#undef SYSCALL_MAP_RENAME
#undef UNSUPPORTED_SYSCALL_MAP
default:
return gdb_sys_no_syscall;
}
}
/* Value of the sigcode in case of a boundary fault. */
#define SIG_CODE_BOUNDARY_FAULT 3
/* Parse the arguments of current system call instruction and record
the values of the registers and memory that will be changed into
"record_arch_list". This instruction is "int 0x80" (Linux
Kernel2.4) or "sysenter" (Linux Kernel 2.6).
Return -1 if something wrong. */
static struct linux_record_tdep i386_linux_record_tdep;
static int
i386_linux_intx80_sysenter_syscall_record (struct regcache *regcache)
{
int ret;
LONGEST syscall_native;
enum gdb_syscall syscall_gdb;
regcache_raw_read_signed (regcache, I386_EAX_REGNUM, &syscall_native);
syscall_gdb = i386_canonicalize_syscall (syscall_native);
if (syscall_gdb < 0)
{
gdb_printf (gdb_stderr,
_("Process record and replay target doesn't "
"support syscall number %s\n"),
plongest (syscall_native));
return -1;
}
if (syscall_gdb == gdb_sys_sigreturn
|| syscall_gdb == gdb_sys_rt_sigreturn)
{
if (i386_all_but_ip_registers_record (regcache))
return -1;
return 0;
}
ret = record_linux_system_call (syscall_gdb, regcache,
&i386_linux_record_tdep);
if (ret)
return ret;
/* Record the return value of the system call. */
if (record_full_arch_list_add_reg (regcache, I386_EAX_REGNUM))
return -1;
return 0;
}
#define I386_LINUX_xstate 270
#define I386_LINUX_frame_size 732
static int
i386_linux_record_signal (struct gdbarch *gdbarch,
struct regcache *regcache,
enum gdb_signal signal)
{
ULONGEST esp;
if (i386_all_but_ip_registers_record (regcache))
return -1;
if (record_full_arch_list_add_reg (regcache, I386_EIP_REGNUM))
return -1;
/* Record the change in the stack. */
regcache_raw_read_unsigned (regcache, I386_ESP_REGNUM, &esp);
/* This is for xstate.
sp -= sizeof (struct _fpstate); */
esp -= I386_LINUX_xstate;
/* This is for frame_size.
sp -= sizeof (struct rt_sigframe); */
esp -= I386_LINUX_frame_size;
if (record_full_arch_list_add_mem (esp,
I386_LINUX_xstate + I386_LINUX_frame_size))
return -1;
if (record_full_arch_list_add_end ())
return -1;
return 0;
}
/* Core of the implementation for gdbarch get_syscall_number. Get pending
syscall number from REGCACHE. If there is no pending syscall -1 will be
returned. Pending syscall means ptrace has stepped into the syscall but
another ptrace call will step out. PC is right after the int $0x80
/ syscall / sysenter instruction in both cases, PC does not change during
the second ptrace step. */
static LONGEST
i386_linux_get_syscall_number_from_regcache (struct regcache *regcache)
{
struct gdbarch *gdbarch = regcache->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* The content of a register. */
gdb_byte buf[4];
/* The result. */
LONGEST ret;
/* Getting the system call number from the register.
When dealing with x86 architecture, this information
is stored at %eax register. */
regcache->cooked_read (I386_LINUX_ORIG_EAX_REGNUM, buf);
ret = extract_signed_integer (buf, byte_order);
return ret;
}
/* Wrapper for i386_linux_get_syscall_number_from_regcache to make it
compatible with gdbarch get_syscall_number method prototype. */
static LONGEST
i386_linux_get_syscall_number (struct gdbarch *gdbarch,
thread_info *thread)
{
struct regcache *regcache = get_thread_regcache (thread);
return i386_linux_get_syscall_number_from_regcache (regcache);
}
/* The register sets used in GNU/Linux ELF core-dumps are identical to
the register sets in `struct user' that are used for a.out
core-dumps. These are also used by ptrace(2). 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.
Those types used to be available under the names `gregset_t' and
`fpregset_t' too, and GDB used those names in the past. But those
names are now used for the register sets used in the `mcontext_t'
type, which have a different size and layout. */
/* Mapping between the general-purpose registers in `struct user'
format and GDB's register cache layout. */
/* From <sys/reg.h>. */
int i386_linux_gregset_reg_offset[] =
{
6 * 4, /* %eax */
1 * 4, /* %ecx */
2 * 4, /* %edx */
0 * 4, /* %ebx */
15 * 4, /* %esp */
5 * 4, /* %ebp */
3 * 4, /* %esi */
4 * 4, /* %edi */
12 * 4, /* %eip */
14 * 4, /* %eflags */
13 * 4, /* %cs */
16 * 4, /* %ss */
7 * 4, /* %ds */
8 * 4, /* %es */
9 * 4, /* %fs */
10 * 4, /* %gs */
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1,
-1, -1, -1, -1, -1, -1, -1, -1,
/* MPX is deprecated. Yet we keep this to not give the registers below
a new number. That could break older gdbservers. */
-1, -1, -1, -1, /* MPX registers BND0 ... BND3. */
-1, -1, /* MPX registers BNDCFGU, BNDSTATUS. */
-1, -1, -1, -1, -1, -1, -1, -1, /* k0 ... k7 (AVX512) */
-1, -1, -1, -1, -1, -1, -1, -1, /* zmm0 ... zmm7 (AVX512) */
-1, /* PKRU register */
-1, /* SSP register. */
-1, -1, /* fs/gs base registers. */
11 * 4, /* "orig_eax" */
};
/* Mapping between the general-purpose registers in `struct
sigcontext' format and GDB's register cache layout. */
/* From <asm/sigcontext.h>. */
static int i386_linux_sc_reg_offset[] =
{
11 * 4, /* %eax */
10 * 4, /* %ecx */
9 * 4, /* %edx */
8 * 4, /* %ebx */
7 * 4, /* %esp */
6 * 4, /* %ebp */
5 * 4, /* %esi */
4 * 4, /* %edi */
14 * 4, /* %eip */
16 * 4, /* %eflags */
15 * 4, /* %cs */
18 * 4, /* %ss */
3 * 4, /* %ds */
2 * 4, /* %es */
1 * 4, /* %fs */
0 * 4 /* %gs */
};
/* See i386-linux-tdep.h. */
uint64_t
i386_linux_core_read_xsave_info (bfd *abfd, x86_xsave_layout &layout)
{
asection *xstate = bfd_get_section_by_name (abfd, ".reg-xstate");
if (xstate == nullptr)
return 0;
/* Check extended state size. */
size_t size = bfd_section_size (xstate);
if (size < X86_XSTATE_AVX_SIZE)
return 0;
char contents[8];
if (! bfd_get_section_contents (abfd, xstate, contents,
I386_LINUX_XSAVE_XCR0_OFFSET, 8))
{
warning (_("Couldn't read `xcr0' bytes from "
"`.reg-xstate' section in core file."));
return 0;
}
uint64_t xcr0 = bfd_get_64 (abfd, contents);
if (!i387_guess_xsave_layout (xcr0, size, layout))
return 0;
return xcr0;
}
/* See i386-linux-tdep.h. */
bool
i386_linux_core_read_x86_xsave_layout (struct gdbarch *gdbarch, bfd &cbfd,
x86_xsave_layout &layout)
{
return i386_linux_core_read_xsave_info (&cbfd, layout) != 0;
}
/* See arch/x86-linux-tdesc.h. */
void
x86_linux_post_init_tdesc (target_desc *tdesc, bool is_64bit)
{
/* Nothing. */
}
/* Get Linux/x86 target description from core dump. */
static const struct target_desc *
i386_linux_core_read_description (struct gdbarch *gdbarch,
struct target_ops *target,
bfd *abfd)
{
/* Linux/i386. */
x86_xsave_layout layout;
uint64_t xcr0 = i386_linux_core_read_xsave_info (abfd, layout);
if (xcr0 == 0)
{
if (bfd_get_section_by_name (abfd, ".reg-xfp") != nullptr)
xcr0 = X86_XSTATE_SSE_MASK;
else
xcr0 = X86_XSTATE_X87_MASK;
}
return i386_linux_read_description (xcr0);
}
/* Similar to i386_supply_fpregset, but use XSAVE extended state. */
static void
i386_linux_supply_xstateregset (const struct regset *regset,
struct regcache *regcache, int regnum,
const void *xstateregs, size_t len)
{
i387_supply_xsave (regcache, regnum, xstateregs);
}
/* Similar to i386_collect_fpregset, but use XSAVE extended state. */
static void
i386_linux_collect_xstateregset (const struct regset *regset,
const struct regcache *regcache,
int regnum, void *xstateregs, size_t len)
{
i387_collect_xsave (regcache, regnum, xstateregs, 1);
}
/* Register set definitions. */
static const struct regset i386_linux_xstateregset =
{
NULL,
i386_linux_supply_xstateregset,
i386_linux_collect_xstateregset
};
/* Iterate over core file register note sections. */
static void
i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
cb (".reg", 68, 68, &i386_gregset, NULL, cb_data);
if (tdep->xsave_layout.sizeof_xsave != 0)
cb (".reg-xstate", tdep->xsave_layout.sizeof_xsave,
tdep->xsave_layout.sizeof_xsave, &i386_linux_xstateregset,
"XSAVE extended state", cb_data);
else if (tdep->xcr0 & X86_XSTATE_SSE)
cb (".reg-xfp", 512, 512, &i386_fpregset, "extended floating-point",
cb_data);
else
cb (".reg2", 108, 108, &i386_fpregset, NULL, cb_data);
}
/* Linux kernel shows PC value after the 'int $0x80' instruction even if
inferior is still inside the syscall. On next PTRACE_SINGLESTEP it will
finish the syscall but PC will not change.
Some vDSOs contain 'int $0x80; ret' and during stepping out of the syscall
i386_displaced_step_fixup would keep PC at the displaced pad location.
As PC is pointing to the 'ret' instruction before the step
i386_displaced_step_fixup would expect inferior has just executed that 'ret'
and PC should not be adjusted. In reality it finished syscall instead and
PC should get relocated back to its vDSO address. Hide the 'ret'
instruction by 'nop' so that i386_displaced_step_fixup is not confused.
It is not fully correct as the bytes in struct
displaced_step_copy_insn_closure will not match the inferior code. But we
would need some new flag in displaced_step_copy_insn_closure otherwise to
keep the state that syscall is finishing for the later
i386_displaced_step_fixup execution as the syscall execution is already no
longer detectable there. The new flag field would mean i386-linux-tdep.c
needs to wrap all the displacement methods of i386-tdep.c which does not seem
worth it. The same effect is achieved by patching that 'nop' instruction
there instead. */
static displaced_step_copy_insn_closure_up
i386_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
CORE_ADDR from, CORE_ADDR to,
struct regcache *regs)
{
displaced_step_copy_insn_closure_up closure_
= i386_displaced_step_copy_insn (gdbarch, from, to, regs);
if (i386_linux_get_syscall_number_from_regcache (regs) != -1)
{
/* The closure returned by i386_displaced_step_copy_insn is simply a
buffer with a copy of the instruction. */
i386_displaced_step_copy_insn_closure *closure
= (i386_displaced_step_copy_insn_closure *) closure_.get ();
/* Fake nop. */
closure->buf[0] = 0x90;
}
return closure_;
}
static void
i386_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
const struct target_desc *tdesc = info.target_desc;
struct tdesc_arch_data *tdesc_data = info.tdesc_data;
const struct tdesc_feature *feature;
int valid_p;
gdb_assert (tdesc_data);
linux_init_abi (info, gdbarch, 1);
/* GNU/Linux uses ELF. */
i386_elf_init_abi (info, gdbarch);
/* Reserve a number for orig_eax. */
set_gdbarch_num_regs (gdbarch, I386_LINUX_NUM_REGS);
if (! tdesc_has_registers (tdesc))
tdesc = i386_linux_read_description (X86_XSTATE_SSE_MASK);
tdep->tdesc = tdesc;
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.i386.linux");
if (feature == NULL)
return;
valid_p = tdesc_numbered_register (feature, tdesc_data,
I386_LINUX_ORIG_EAX_REGNUM,
"orig_eax");
if (!valid_p)
return;
/* Add the %orig_eax register used for syscall restarting. */
set_gdbarch_write_pc (gdbarch, i386_linux_write_pc);
tdep->register_reggroup_p = i386_linux_register_reggroup_p;
tdep->gregset_reg_offset = i386_linux_gregset_reg_offset;
tdep->gregset_num_regs = ARRAY_SIZE (i386_linux_gregset_reg_offset);
tdep->sizeof_gregset = 17 * 4;
tdep->jb_pc_offset = 20; /* From <bits/setjmp.h>. */
tdep->sigtramp_p = i386_linux_sigtramp_p;
tdep->sigcontext_addr = i386_linux_sigcontext_addr;
tdep->sc_reg_offset = i386_linux_sc_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (i386_linux_sc_reg_offset);
tdep->xsave_xcr0_offset = I386_LINUX_XSAVE_XCR0_OFFSET;
set_gdbarch_core_read_x86_xsave_layout
(gdbarch, i386_linux_core_read_x86_xsave_layout);
set_gdbarch_process_record (gdbarch, i386_process_record);
set_gdbarch_process_record_signal (gdbarch, i386_linux_record_signal);
/* Initialize the i386_linux_record_tdep. */
/* These values are the size of the type that will be used in a system
call. They are obtained from Linux Kernel source. */
i386_linux_record_tdep.size_pointer
= gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
i386_linux_record_tdep.size__old_kernel_stat = 32;
i386_linux_record_tdep.size_tms = 16;
i386_linux_record_tdep.size_loff_t = 8;
i386_linux_record_tdep.size_flock = 16;
i386_linux_record_tdep.size_oldold_utsname = 45;
i386_linux_record_tdep.size_ustat = 20;
i386_linux_record_tdep.size_old_sigaction = 16;
i386_linux_record_tdep.size_old_sigset_t = 4;
i386_linux_record_tdep.size_rlimit = 8;
i386_linux_record_tdep.size_rusage = 72;
i386_linux_record_tdep.size_timeval = 8;
i386_linux_record_tdep.size_timezone = 8;
i386_linux_record_tdep.size_old_gid_t = 2;
i386_linux_record_tdep.size_old_uid_t = 2;
i386_linux_record_tdep.size_fd_set = 128;
i386_linux_record_tdep.size_old_dirent = 268;
i386_linux_record_tdep.size_statfs = 64;
i386_linux_record_tdep.size_statfs64 = 84;
i386_linux_record_tdep.size_sockaddr = 16;
i386_linux_record_tdep.size_int
= gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
i386_linux_record_tdep.size_long
= gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
i386_linux_record_tdep.size_ulong
= gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
i386_linux_record_tdep.size_msghdr = 28;
i386_linux_record_tdep.size_itimerval = 16;
i386_linux_record_tdep.size_stat = 88;
i386_linux_record_tdep.size_old_utsname = 325;
i386_linux_record_tdep.size_sysinfo = 64;
i386_linux_record_tdep.size_msqid_ds = 88;
i386_linux_record_tdep.size_shmid_ds = 84;
i386_linux_record_tdep.size_new_utsname = 390;
i386_linux_record_tdep.size_timex = 128;
i386_linux_record_tdep.size_mem_dqinfo = 24;
i386_linux_record_tdep.size_if_dqblk = 68;
i386_linux_record_tdep.size_fs_quota_stat = 68;
i386_linux_record_tdep.size_timespec = 8;
i386_linux_record_tdep.size_pollfd = 8;
i386_linux_record_tdep.size_NFS_FHSIZE = 32;
i386_linux_record_tdep.size_knfsd_fh = 132;
i386_linux_record_tdep.size_TASK_COMM_LEN = 16;
i386_linux_record_tdep.size_sigaction = 20;
i386_linux_record_tdep.size_sigset_t = 8;
i386_linux_record_tdep.size_siginfo_t = 128;
i386_linux_record_tdep.size_cap_user_data_t = 12;
i386_linux_record_tdep.size_stack_t = 12;
i386_linux_record_tdep.size_off_t = i386_linux_record_tdep.size_long;
i386_linux_record_tdep.size_stat64 = 96;
i386_linux_record_tdep.size_gid_t = 4;
i386_linux_record_tdep.size_uid_t = 4;
i386_linux_record_tdep.size_PAGE_SIZE = 4096;
i386_linux_record_tdep.size_flock64 = 24;
i386_linux_record_tdep.size_user_desc = 16;
i386_linux_record_tdep.size_io_event = 32;
i386_linux_record_tdep.size_iocb = 64;
i386_linux_record_tdep.size_epoll_event = 12;
i386_linux_record_tdep.size_itimerspec
= i386_linux_record_tdep.size_timespec * 2;
i386_linux_record_tdep.size_mq_attr = 32;
i386_linux_record_tdep.size_termios = 36;
i386_linux_record_tdep.size_termios2 = 44;
i386_linux_record_tdep.size_pid_t = 4;
i386_linux_record_tdep.size_winsize = 8;
i386_linux_record_tdep.size_serial_struct = 60;
i386_linux_record_tdep.size_serial_icounter_struct = 80;
i386_linux_record_tdep.size_hayes_esp_config = 12;
i386_linux_record_tdep.size_size_t = 4;
i386_linux_record_tdep.size_iovec = 8;
i386_linux_record_tdep.size_time_t = 4;
/* These values are the second argument of system call "sys_ioctl".
They are obtained from Linux Kernel source. */
i386_linux_record_tdep.ioctl_TCGETS = 0x5401;
i386_linux_record_tdep.ioctl_TCSETS = 0x5402;
i386_linux_record_tdep.ioctl_TCSETSW = 0x5403;
i386_linux_record_tdep.ioctl_TCSETSF = 0x5404;
i386_linux_record_tdep.ioctl_TCGETA = 0x5405;
i386_linux_record_tdep.ioctl_TCSETA = 0x5406;
i386_linux_record_tdep.ioctl_TCSETAW = 0x5407;
i386_linux_record_tdep.ioctl_TCSETAF = 0x5408;
i386_linux_record_tdep.ioctl_TCSBRK = 0x5409;
i386_linux_record_tdep.ioctl_TCXONC = 0x540A;
i386_linux_record_tdep.ioctl_TCFLSH = 0x540B;
i386_linux_record_tdep.ioctl_TIOCEXCL = 0x540C;
i386_linux_record_tdep.ioctl_TIOCNXCL = 0x540D;
i386_linux_record_tdep.ioctl_TIOCSCTTY = 0x540E;
i386_linux_record_tdep.ioctl_TIOCGPGRP = 0x540F;
i386_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
i386_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
i386_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
i386_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
i386_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
i386_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
i386_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
i386_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
i386_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
i386_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
i386_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541A;
i386_linux_record_tdep.ioctl_FIONREAD = 0x541B;
i386_linux_record_tdep.ioctl_TIOCINQ = i386_linux_record_tdep.ioctl_FIONREAD;
i386_linux_record_tdep.ioctl_TIOCLINUX = 0x541C;
i386_linux_record_tdep.ioctl_TIOCCONS = 0x541D;
i386_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541E;
i386_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541F;
i386_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
i386_linux_record_tdep.ioctl_FIONBIO = 0x5421;
i386_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
i386_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
i386_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
i386_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
i386_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
i386_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
i386_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
i386_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
i386_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
i386_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
i386_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
i386_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
i386_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
i386_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
i386_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
i386_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
i386_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
i386_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
i386_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
i386_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
i386_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
i386_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
i386_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
i386_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
i386_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545A;
i386_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545B;
i386_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545C;
i386_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545D;
i386_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545E;
i386_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545F;
i386_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
/* These values are the second argument of system call "sys_fcntl"
and "sys_fcntl64". They are obtained from Linux Kernel source. */
i386_linux_record_tdep.fcntl_F_GETLK = 5;
i386_linux_record_tdep.fcntl_F_GETLK64 = 12;
i386_linux_record_tdep.fcntl_F_SETLK64 = 13;
i386_linux_record_tdep.fcntl_F_SETLKW64 = 14;
i386_linux_record_tdep.arg1 = I386_EBX_REGNUM;
i386_linux_record_tdep.arg2 = I386_ECX_REGNUM;
i386_linux_record_tdep.arg3 = I386_EDX_REGNUM;
i386_linux_record_tdep.arg4 = I386_ESI_REGNUM;
i386_linux_record_tdep.arg5 = I386_EDI_REGNUM;
i386_linux_record_tdep.arg6 = I386_EBP_REGNUM;
tdep->i386_intx80_record = i386_linux_intx80_sysenter_syscall_record;
tdep->i386_sysenter_record = i386_linux_intx80_sysenter_syscall_record;
tdep->i386_syscall_record = i386_linux_intx80_sysenter_syscall_record;
/* N_FUN symbols in shared libraries have 0 for their values and need
to be relocated. */
set_gdbarch_sofun_address_maybe_missing (gdbarch, 1);
/* GNU/Linux uses SVR4-style shared libraries. */
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_solib_svr4_ops (gdbarch, make_linux_ilp32_svr4_solib_ops);
/* GNU/Linux uses the dynamic linker included in the GNU C Library. */
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
dwarf2_frame_set_signal_frame_p (gdbarch, i386_linux_dwarf_signal_frame_p);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Core file support. */
set_gdbarch_iterate_over_regset_sections
(gdbarch, i386_linux_iterate_over_regset_sections);
set_gdbarch_core_read_description (gdbarch,
i386_linux_core_read_description);
/* Displaced stepping. */
set_gdbarch_displaced_step_copy_insn (gdbarch,
i386_linux_displaced_step_copy_insn);
set_gdbarch_displaced_step_fixup (gdbarch, i386_displaced_step_fixup);
/* Functions for 'catch syscall'. */
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_I386);
set_gdbarch_get_syscall_number (gdbarch,
i386_linux_get_syscall_number);
}
INIT_GDB_FILE (i386_linux_tdep)
{
gdb_assert (ARRAY_SIZE (i386_linux_gregset_reg_offset)
== I386_LINUX_NUM_REGS);
gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_LINUX,
i386_linux_init_abi);
}
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