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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
.text
.arch i386
.code32
/* Must match jmp_buf structure layout */
.struct 0
env_retaddr: .long 0
env_stack: .long 0
env_ebx: .long 0
env_esi: .long 0
env_edi: .long 0
env_ebp: .long 0
.previous
/*
* Save stack context for non-local goto
*/
.globl setjmp
setjmp:
/* Get jmp_buf pointer in %edx */
movl 4(%esp),%edx
/* Save return address */
movl 0(%esp),%eax
movl %eax, env_retaddr(%edx)
/* Save stack pointer */
movl %esp, env_stack(%edx)
/* Save other registers */
movl %ebx, env_ebx(%edx)
movl %esi, env_esi(%edx)
movl %edi, env_edi(%edx)
movl %ebp, env_ebp(%edx)
/* Return 0 when returning as setjmp() */
xorl %eax, %eax
ret
.size setjmp, . - setjmp
/*
* Non-local jump to a saved stack context
*/
.globl longjmp
longjmp:
/* Get jmp_buf pointer in %edx */
movl 4(%esp),%edx
/* Get result in %eax */
movl 8(%esp),%eax
/* Force result to non-zero */
testl %eax, %eax
jnz 1f
incl %eax
1: /* Restore stack pointer */
movl env_stack(%edx), %esp
/* Restore other registers */
movl env_ebx(%edx), %ebx
movl env_esi(%edx), %esi
movl env_edi(%edx), %edi
movl env_ebp(%edx), %ebp
/* Replace return address on the new stack */
popl %ecx /* discard */
pushl env_retaddr(%edx)
/* Return to setjmp() caller */
ret
.size longjmp, . - longjmp
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