mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
89 lines
2.7 KiB
ArmAsm
89 lines
2.7 KiB
ArmAsm
/* setjmp for x86-64.
|
|
Copyright (C) 2001-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include <pointer_guard.h>
|
|
#include <jmpbuf-offsets.h>
|
|
#include <jmp_buf-ssp.h>
|
|
#include <asm-syntax.h>
|
|
#include <stap-probe.h>
|
|
|
|
/* Don't save shadow stack register if shadow stack isn't enabled. */
|
|
#if !SHSTK_ENABLED
|
|
# undef SHADOW_STACK_POINTER_OFFSET
|
|
#endif
|
|
|
|
ENTRY (__sigsetjmp)
|
|
/* Save registers. */
|
|
movq %rbx, (JB_RBX*8)(%rdi)
|
|
#ifdef PTR_MANGLE
|
|
# ifdef __ILP32__
|
|
/* Save the high bits of %rbp first, since PTR_MANGLE will
|
|
only handle the low bits but we cannot presume %rbp is
|
|
being used as a pointer and truncate it. Here we write all
|
|
of %rbp, but the low bits will be overwritten below. */
|
|
movq %rbp, (JB_RBP*8)(%rdi)
|
|
# endif
|
|
mov %RBP_LP, %RAX_LP
|
|
PTR_MANGLE (%RAX_LP)
|
|
mov %RAX_LP, (JB_RBP*8)(%rdi)
|
|
#else
|
|
movq %rbp, (JB_RBP*8)(%rdi)
|
|
#endif
|
|
movq %r12, (JB_R12*8)(%rdi)
|
|
movq %r13, (JB_R13*8)(%rdi)
|
|
movq %r14, (JB_R14*8)(%rdi)
|
|
movq %r15, (JB_R15*8)(%rdi)
|
|
lea 8(%rsp), %RDX_LP /* Save SP as it will be after we return. */
|
|
#ifdef PTR_MANGLE
|
|
PTR_MANGLE (%RDX_LP)
|
|
#endif
|
|
movq %rdx, (JB_RSP*8)(%rdi)
|
|
mov (%rsp), %RAX_LP /* Save PC we are returning to now. */
|
|
LIBC_PROBE (setjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RAX_LP)
|
|
#ifdef PTR_MANGLE
|
|
PTR_MANGLE (%RAX_LP)
|
|
#endif
|
|
movq %rax, (JB_PC*8)(%rdi)
|
|
|
|
#ifdef SHADOW_STACK_POINTER_OFFSET
|
|
# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
|
|
/* Check if Shadow Stack is enabled. */
|
|
testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
|
|
jz L(skip_ssp)
|
|
# else
|
|
xorl %eax, %eax
|
|
# endif
|
|
/* Get the current Shadow-Stack-Pointer and save it. */
|
|
rdsspq %rax
|
|
movq %rax, SHADOW_STACK_POINTER_OFFSET(%rdi)
|
|
# if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
|
|
L(skip_ssp):
|
|
# endif
|
|
#endif
|
|
#if IS_IN (rtld)
|
|
/* In ld.so we never save the signal mask. */
|
|
xorl %eax, %eax
|
|
retq
|
|
#else
|
|
/* Make a tail call to __sigjmp_save; it takes the same args. */
|
|
jmp __sigjmp_save
|
|
#endif
|
|
END (__sigsetjmp)
|
|
hidden_def (__sigsetjmp)
|