112 lines
3.6 KiB
ArmAsm
112 lines
3.6 KiB
ArmAsm
/* $OpenBSD: sigsetjmp.S,v 1.14 2023/12/10 16:45:51 deraadt Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "SYS.h"
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#include <machine/setjmp.h>
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.global __jmpxor
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ENTRY(sigsetjmp)
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movl 4(%esp),%ecx # parameter, pointer to env
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movl 8(%esp),%eax # parameter, savemask
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movl %eax,(_JB_SIGFLAG * 4)(%ecx)
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testl %eax,%eax
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jz 1f
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pushl $0 /* mask = empty */
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pushl $1 /* how = SIG_BLOCK */
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subl $4,%esp
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movl $(SYS_sigprocmask),%eax
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99: int $0x80 /* leave oset in %eax */
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PINSYSCALL(SYS_sigprocmask, 99b)
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addl $12,%esp
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movl %eax,(_JB_SIGMASK * 4)(%ecx)
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1: call 2f
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2: popl %edx
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addl $__jmpxor-2b,%edx # load cookie address
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movl %ebx,(_JB_EBX * 4)(%ecx)
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movl %esp,%eax
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xorl 8(%edx),%eax # use esp cookie
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movl %eax,(_JB_ESP * 4)(%ecx)
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movl %ebp,%eax
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xorl 0(%edx),%eax # use ebp cookie
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movl %eax,(_JB_EBP * 4)(%ecx)
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movl %esi,(_JB_ESI * 4)(%ecx)
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movl %edi,(_JB_EDI * 4)(%ecx)
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movl 4(%edx),%edx # load eip cookie over cookie address
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xorl 0(%esp),%edx
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movl %edx,(_JB_EIP * 4)(%ecx)
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fnstcw (_JB_FCW * 4)(%ecx)
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xorl %eax,%eax
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ret
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END(sigsetjmp)
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ENTRY(siglongjmp)
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movl 4(%esp),%edx # parameter, pointer to env
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cmpl $0,(_JB_SIGFLAG * 4)(%edx)
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jz 1f
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pushl (_JB_SIGMASK * 4)(%edx) /* mask from sc_mask */
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pushl $3 /* how = SIG_SETMASK */
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subl $4,%esp
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movl $(SYS_sigprocmask),%eax
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98: int $0x80
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PINSYSCALL(SYS_sigprocmask, 98b)
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addl $12,%esp
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1: call 2f
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2: popl %ecx
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addl $__jmpxor-2b,%ecx # load cookie address
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movl 4(%esp),%edx # reload in case sigprocmask failed
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movl 8(%esp),%eax # parameter, val
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fldcw (_JB_FCW * 4)(%edx)
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movl (_JB_EBX * 4)(%edx),%ebx
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movl (_JB_ESP * 4)(%edx),%esi
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xorl 8(%ecx),%esi # use esp cookie
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movl %esi,%esp # un-xor'ed esp is safe to use
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movl (_JB_EBP * 4)(%edx),%ebp
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xorl 0(%ecx),%ebp # use ebp cookie
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movl (_JB_ESI * 4)(%edx),%esi
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movl (_JB_EDI * 4)(%edx),%edi
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movl 4(%ecx),%ecx # load eip cookie over cookie address
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xorl (_JB_EIP * 4)(%edx),%ecx
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testl %eax,%eax
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jnz 2f
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incl %eax
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2: movl %ecx,0(%esp)
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ret
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END(siglongjmp)
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