1 /* SPDX-License-Identifier: GPL-2.0 */
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 follow
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
22 .globl kernel_setjmp
23 .type kernel_setjmp, @function
24 kernel_setjmp:
25 pop %rsi # Retu
26 xorl %eax,%eax # Retu
27 movq %rbx,(%rdi)
28 movq %rsp,8(%rdi) # Post
29 push %rsi # Make
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) # Retu
36 RET
37
38 .size kernel_setjmp,.-kernel_setjmp
39
40 .text
41 .align 4
42 .globl kernel_longjmp
43 .type kernel_longjmp, @function
44 kernel_longjmp:
45 movl %esi,%eax # Retu
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
55 .size kernel_longjmp,.-kernel_longjmp
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