xv6-cs450/setjmp.S
2006-09-06 19:22:24 +00:00

34 lines
643 B
ArmAsm

.globl setjmp
setjmp:
movl 4(%esp), %eax
movl %ebx, 0(%eax)
movl %ecx, 4(%eax)
movl %edx, 8(%eax)
movl %esi, 12(%eax)
movl %edi, 16(%eax)
movl %esp, 20(%eax)
movl %ebp, 24(%eax)
pushl 0(%esp) /* %eip */
popl 28(%eax)
movl $0, %eax /* return value */
ret
.globl longjmp
longjmp:
movl 4(%esp), %eax
movl 0(%eax), %ebx
movl 4(%eax), %ecx
movl 8(%eax), %edx
movl 12(%eax), %esi
movl 16(%eax), %edi
movl 20(%eax), %esp
movl 24(%eax), %ebp
addl $4, %esp /* pop %eip into thin air */
pushl 28(%eax) /* push new %eip */
movl $1, %eax /* return value (appears to come from setjmp!) */
ret