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/* $OpenBSD: setjmp.S,v 1.9 2020/10/21 17:22:59 kettenis Exp $ */
/* $NetBSD: __setjmp14.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 "SYS.h"
#include <machine/setjmp.h>
.section .openbsd.randomdata,"aw",@progbits
.align 8
.globl __jmpxor
__jmpxor:
.zero 8*3 # (rbp, rsp, pc)
END(__jmpxor)
.type __jmpxor,@object
/*
* 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 restored.
*/
ENTRY(setjmp)
RETGUARD_SETUP(setjmp, r10)
movq %rdi,%r8 /* save jmpbuf addr */
movl $1,%edi /* how = SIG_BLOCK */
xorl %esi,%esi /* set = empty */
movl $SYS_sigprocmask,%eax
syscall
movq %r8,%rdi /* restore jmpbuf addr */
movq %rax,(_JB_SIGMASK * 8)(%rdi)
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)
movq %rdi,%r12
movl %esi,%r8d
movq (_JB_SIGMASK * 8)(%rdi),%rsi /* get set from sc_mask */
movl $3,%edi /* how = SIG_SETMASK */
movl $SYS_sigprocmask,%eax
syscall
movl %r8d,%eax
leaq __jmpxor(%rip),%rcx
movq (_JB_RSP * 8)(%r12),%r11
xorq (1*8)(%rcx),%r11
movq %r11,%rsp
movq (_JB_PC * 8)(%r12),%r11
xorq (2*8)(%rcx),%r11
movq %r11,0(%rsp)
RETGUARD_SETUP(longjmp, r10)
ldmxcsr (_JB_MXCSR * 8)(%r12)
fldcw (_JB_MXCSR * 8 + 4)(%r12)
movq (_JB_RBX * 8)(%r12),%rbx
movq (_JB_RBP * 8)(%r12),%r11
xorq (0*8)(%rcx),%r11
movq %r11,%rbp
movq (_JB_R13 * 8)(%r12),%r13
movq (_JB_R14 * 8)(%r12),%r14
movq (_JB_R15 * 8)(%r12),%r15
movq (_JB_R12 * 8)(%r12),%r12
xorq %rcx,%rcx
testl %eax,%eax
jnz 1f
incl %eax
1: RETGUARD_CHECK(longjmp, r10)
ret
END(longjmp)
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