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/* $OpenBSD: uthread_machdep_asm.S,v 1.1 2000/09/25 01:16:40 d Exp $ */
/* David Leonard, <d@csee.uq.edu.au>. Public domain. */
#include <machine/asm.h>
/*
* Switch stacks
*/
/* void _thread_machdep_switch(new, oldsave); */
ENTRY(_thread_machdep_switch)
pushal /* pushl %eax,%ecx,%edx,%ebx,%esp,%ebp,%esi,%edi */
pushl %ds
pushl %es
pushl %fs
pushl %gs
#define DISTANCE ((8+1+1+1+1)*4)
movl (DISTANCE+8)(%esp), %eax /* %eax = arg2 */
movl %esp, 0(%eax) /* *arg2 = %esp */
movl (DISTANCE+4)(%esp), %eax /* %eax = arg1 */
movl 0(%eax), %esp /* %esp = *arg1 */
popl %gs
popl %fs
popl %es
popl %ds
popal /* popl %edi,%esi,%ebp,%esp,%ebx,%edx,%ecx,%eax */
ret
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