summaryrefslogblamecommitdiff
path: root/arch/um/sys-x86_64/setjmp.S
blob: 45f547b4043eeda6d449abfa1ccba27a85a4cab4 (plain) (tree) 
13c06be39990 ^






















































1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54






















































                                                                              
#
# arch/x86_64/setjmp.S
#
# setjmp/longjmp for the x86-64 architecture
#

#
# The jmp_buf is assumed to contain the following, in order:
#	%rbx
#	%rsp (post-return)
#	%rbp
#	%r12
#	%r13
#	%r14
#	%r15
#	<return address>
#

	.text
	.align 4
	.globl setjmp
	.type setjmp, @function
setjmp:
	pop  %rsi			# Return address, and adjust the stack
	xorl %eax,%eax			# Return value
	movq %rbx,(%rdi)
	movq %rsp,8(%rdi)		# Post-return %rsp!
	push %rsi			# Make the call/return stack happy
	movq %rbp,16(%rdi)
	movq %r12,24(%rdi)
	movq %r13,32(%rdi)
	movq %r14,40(%rdi)
	movq %r15,48(%rdi)
	movq %rsi,56(%rdi)		# Return address
	ret

	.size setjmp,.-setjmp

	.text
	.align 4
	.globl longjmp
	.type longjmp, @function
longjmp:
	movl %esi,%eax			# Return value (int)
	movq (%rdi),%rbx
	movq 8(%rdi),%rsp
	movq 16(%rdi),%rbp
	movq 24(%rdi),%r12
	movq 32(%rdi),%r13
	movq 40(%rdi),%r14
	movq 48(%rdi),%r15
	jmp *56(%rdi)

	.size longjmp,.-longjmp