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/* $OpenBSD: _setjmp.S,v 1.5 2020/10/21 17:22:59 kettenis Exp $ */
/* $NetBSD: _setjmp.S,v 1.1 2001/06/19 00:25:02 fvdl Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Frank van der Linden for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
#include <machine/setjmp.h>
.hidden __jmpxor
/*
* C library -- _setjmp, _longjmp
*
* _longjmp(a,v)
* will generate a "return(v)" from the last call to
* _setjmp(a)
* by restoring registers from the stack.
* The previous signal state is NOT restored.
*/
ENTRY(_setjmp)
RETGUARD_SETUP(_setjmp, r10)
movq (%rsp),%r11
leaq __jmpxor(%rip),%rcx
movq %rbx,(_JB_RBX * 8)(%rdi)
movq %rbp,%rax
xorq (0*8)(%rcx),%rax
movq %rax,(_JB_RBP * 8)(%rdi)
movq %r12,(_JB_R12 * 8)(%rdi)
movq %r13,(_JB_R13 * 8)(%rdi)
movq %r14,(_JB_R14 * 8)(%rdi)
movq %r15,(_JB_R15 * 8)(%rdi)
movq %rsp,%rax
xorq (1*8)(%rcx),%rax
movq %rax,(_JB_RSP * 8)(%rdi)
movq %r11,%rax
xorq (2*8)(%rcx),%rax
movq %rax,(_JB_PC * 8)(%rdi)
xorq %rcx,%rcx
stmxcsr (_JB_MXCSR * 8)(%rdi)
fnstcw (_JB_MXCSR * 8 + 4)(%rdi)
xorq %rax,%rax
RETGUARD_CHECK(_setjmp, r10)
ret
END(_setjmp)
ENTRY(_longjmp)
leaq __jmpxor(%rip),%rcx
movq (_JB_RSP * 8)(%rdi),%r11
xorq (1*8)(%rcx),%r11
movq %r11,%rsp
movq (_JB_PC * 8)(%rdi),%r11
xorq (2*8)(%rcx),%r11
movq %r11,0(%rsp)
RETGUARD_SETUP(_longjmp, r10)
ldmxcsr (_JB_MXCSR * 8)(%rdi)
fldcw (_JB_MXCSR * 8 + 4)(%rdi)
movq (_JB_RBX * 8)(%rdi),%rbx
movq (_JB_RBP * 8)(%rdi),%r11
xorq (0*8)(%rcx),%r11
movq %r11,%rbp
movq (_JB_R12 * 8)(%rdi),%r12
movq (_JB_R13 * 8)(%rdi),%r13
movq (_JB_R14 * 8)(%rdi),%r14
movq (_JB_R15 * 8)(%rdi),%r15
xorq %rcx,%rcx
movl %esi,%eax
testl %eax,%eax
jnz 1f
incl %eax
1: RETGUARD_CHECK(_longjmp, r10)
ret
END(_longjmp)
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