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/* $OpenBSD: uthread_machdep_asm.S,v 1.3 2004/02/25 04:10:53 deraadt Exp $ */
/*
* Copyright (c) 2004 Theo de Raadt
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <machine/asm.h>
/*
* Switch stacks
*/
/* void _thread_machdep_switch(new, oldsave); */
ENTRY(_thread_machdep_switch)
pushq %rax
pushq %rcx
pushq %rdx
pushq %rbx
pushq %rbp
pushq %rsi
pushq %rdi
pushq %r8
pushq %r9
pushq %r10
pushq %r11
pushq %r12
pushq %r13
pushq %r14
pushq %r15
movq $0xdeaf12345678beaf, %r15
pushq %r15
movl %ds,%eax
pushq %rax
movl %es,%eax
pushq %rax
movl %fs,%eax
pushq %rax
movl %gs,%eax
pushq %rax
movq %rsp, 0(%rsi) /* *arg2 = %rsp */
movq 0(%rdi), %rsp /* %rsp = *arg1 */
popq %rax
movl %eax,%gs
popq %rax
movl %eax,%fs
popq %rax
movl %eax,%es
popq %rax
movl %eax,%ds
popq %r15 # flag word.
popq %r15
popq %r14
popq %r13
popq %r12
popq %r11
popq %r10
popq %r9
popq %r8
popq %rdi
popq %rsi
popq %rbp
popq %rbx
popq %rdx
popq %rcx
popq %rax
ret
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