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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
13c06be3 JD |
2 | # |
3 | # arch/x86_64/setjmp.S | |
4 | # | |
5 | # setjmp/longjmp for the x86-64 architecture | |
6 | # | |
7 | ||
8 | # | |
9 | # The jmp_buf is assumed to contain the following, in order: | |
10 | # %rbx | |
11 | # %rsp (post-return) | |
12 | # %rbp | |
13 | # %r12 | |
14 | # %r13 | |
15 | # %r14 | |
16 | # %r15 | |
17 | # <return address> | |
18 | # | |
19 | ||
20 | .text | |
21 | .align 4 | |
f44f1e7d FF |
22 | .globl kernel_setjmp |
23 | .type kernel_setjmp, @function | |
24 | kernel_setjmp: | |
13c06be3 JD |
25 | pop %rsi # Return address, and adjust the stack |
26 | xorl %eax,%eax # Return value | |
27 | movq %rbx,(%rdi) | |
28 | movq %rsp,8(%rdi) # Post-return %rsp! | |
29 | push %rsi # Make the call/return stack happy | |
30 | movq %rbp,16(%rdi) | |
31 | movq %r12,24(%rdi) | |
32 | movq %r13,32(%rdi) | |
33 | movq %r14,40(%rdi) | |
34 | movq %r15,48(%rdi) | |
35 | movq %rsi,56(%rdi) # Return address | |
36 | ret | |
37 | ||
f44f1e7d | 38 | .size kernel_setjmp,.-kernel_setjmp |
13c06be3 JD |
39 | |
40 | .text | |
41 | .align 4 | |
f44f1e7d FF |
42 | .globl kernel_longjmp |
43 | .type kernel_longjmp, @function | |
44 | kernel_longjmp: | |
13c06be3 JD |
45 | movl %esi,%eax # Return value (int) |
46 | movq (%rdi),%rbx | |
47 | movq 8(%rdi),%rsp | |
48 | movq 16(%rdi),%rbp | |
49 | movq 24(%rdi),%r12 | |
50 | movq 32(%rdi),%r13 | |
51 | movq 40(%rdi),%r14 | |
52 | movq 48(%rdi),%r15 | |
53 | jmp *56(%rdi) | |
54 | ||
f44f1e7d | 55 | .size kernel_longjmp,.-kernel_longjmp |