2 Copyright (C) 2001-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
20 #include <jmpbuf-offsets.h>
21 #include <jmp_buf-ssp.h>
22 #include <asm-syntax.h>
23 #include <stap-probe.h>
25 /* Don't save shadow stack register if shadow stack isn't enabled. */
27 # undef SHADOW_STACK_POINTER_OFFSET
32 movq %rbx, (JB_RBX*8)(%rdi)
35 /* Save the high bits of %rbp first, since PTR_MANGLE will
36 only handle the low bits but we cannot presume %rbp is
37 being used as a pointer and truncate it. Here we write all
38 of %rbp, but the low bits will be overwritten below. */
39 movq %rbp, (JB_RBP*8)(%rdi)
43 mov %RAX_LP, (JB_RBP*8)(%rdi)
45 movq %rbp, (JB_RBP*8)(%rdi)
47 movq %r12, (JB_R12*8)(%rdi)
48 movq %r13, (JB_R13*8)(%rdi)
49 movq %r14, (JB_R14*8)(%rdi)
50 movq %r15, (JB_R15*8)(%rdi)
51 lea 8(%rsp), %RDX_LP /* Save SP as it will be after we return. */
55 movq %rdx, (JB_RSP*8)(%rdi)
56 mov (%rsp), %RAX_LP /* Save PC we are returning to now. */
57 LIBC_PROBE (setjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RAX_LP)
61 movq %rax, (JB_PC*8)(%rdi)
63 #ifdef SHADOW_STACK_POINTER_OFFSET
64 # if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
65 /* Check if Shadow Stack is enabled. */
66 testl $X86_FEATURE_1_SHSTK, %fs:FEATURE_1_OFFSET
71 /* Get the current Shadow-Stack-Pointer and save it. */
73 movq %rax, SHADOW_STACK_POINTER_OFFSET(%rdi)
74 # if IS_IN (libc) && defined SHARED && defined FEATURE_1_OFFSET
79 /* In ld.so we never save the signal mask. */
83 /* Make a tail call to __sigjmp_save; it takes the same args. */
87 hidden_def (__sigsetjmp)