_longjmp.s

来自「KPIT GNU Tools is a set of GNU developme」· S 代码 · 共 32 行

/
/ our buffer looks like:
/  eax,ebx,ecx,edx,esi,edi,esp,ebp,pc
/
/ _longjmp is called with two parameters:  jmp_buf*,int
/ jmp_buf* is at 4(%esp), int is at 8(%esp)
/ retaddr is, of course, at (%esp)

	.globl	_longjmp
	.globl	longjmp
_longjmp:
longjmp:
	movl	4(%esp), %ebx	/ address of buf
	movl	8(%esp), %eax	/ store return value

	movl	24(%ebx), %esp	/ restore stack
	movl	32(%ebx), %edi
/ Next line sets up return address.
	movl	%edi, 0(%esp)	
	movl	8(%ebx), %ecx
	movl	12(%ebx), %edx
	movl	16(%ebx), %esi
	movl	20(%ebx), %edi
	movl	28(%ebx), %ebp
	movl	4(%ebx), %ebx
	testl	%eax,%eax
	jne	bye
	incl	%eax		/ eax hold 0 if we are here
bye:
	ret