1/* Copyright (C) 2001-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <sysdep.h>
19#include <jmpbuf-offsets.h>
20#include <asm-syntax.h>
21#include <stap-probe.h>
22
23/* Jump to the position specified by ENV, causing the
24 setjmp call there to return VAL, or 1 if VAL is 0.
25 void __longjmp (__jmp_buf env, int val). */
26 .text
27ENTRY(__longjmp)
28 /* Restore registers. */
29 mov (JB_RSP*8)(%rdi),%R8_LP
30 mov (JB_RBP*8)(%rdi),%R9_LP
31 mov (JB_PC*8)(%rdi),%RDX_LP
32#ifdef PTR_DEMANGLE
33 PTR_DEMANGLE (%R8_LP)
34 PTR_DEMANGLE (%R9_LP)
35 PTR_DEMANGLE (%RDX_LP)
36# ifdef __ILP32__
37 /* We ignored the high bits of the %rbp value because only the low
38 bits are mangled. But we cannot presume that %rbp is being used
39 as a pointer and truncate it, so recover the high bits. */
40 movl (JB_RBP*8 + 4)(%rdi), %eax
41 shlq $32, %rax
42 orq %rax, %r9
43# endif
44#endif
45 LIBC_PROBE (longjmp, 3, LP_SIZE@%RDI_LP, -4@%esi, LP_SIZE@%RDX_LP)
46 /* We add unwind information for the target here. */
47 cfi_def_cfa(%rdi, 0)
48 cfi_register(%rsp,%r8)
49 cfi_register(%rbp,%r9)
50 cfi_register(%rip,%rdx)
51 cfi_offset(%rbx,JB_RBX*8)
52 cfi_offset(%r12,JB_R12*8)
53 cfi_offset(%r13,JB_R13*8)
54 cfi_offset(%r14,JB_R14*8)
55 cfi_offset(%r15,JB_R15*8)
56 movq (JB_RBX*8)(%rdi),%rbx
57 movq (JB_R12*8)(%rdi),%r12
58 movq (JB_R13*8)(%rdi),%r13
59 movq (JB_R14*8)(%rdi),%r14
60 movq (JB_R15*8)(%rdi),%r15
61 /* Set return value for setjmp. */
62 mov %esi, %eax
63 mov %R8_LP,%RSP_LP
64 movq %r9,%rbp
65 LIBC_PROBE (longjmp_target, 3,
66 LP_SIZE@%RDI_LP, -4@%eax, LP_SIZE@%RDX_LP)
67 jmpq *%rdx
68END (__longjmp)
69