1/* $OpenBSD: sigsetjmp.S,v 1.10 2016/05/30 02:11:21 guenther Exp $ */ 2/*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include "SYS.h" 35 36 .global __jmpxor 37 38ENTRY(sigsetjmp) 39 movl 4(%esp),%ecx 40 movl 8(%esp),%eax 41 movl %eax,28(%ecx) 42 testl %eax,%eax 43 jz 1f 44 45 pushl $0 /* mask = empty */ 46 pushl $1 /* how = SIG_BLOCK */ 47 subl $4,%esp 48 movl $(SYS_sigprocmask),%eax 49 int $0x80 /* leave oset in %eax */ 50 addl $12,%esp 51 movl %eax,24(%ecx) 52 531: call 2f 542: popl %edx 55 addl $__jmpxor-2b,%edx # load cookie address 56 57 movl %ebx, 4(%ecx) 58 movl %esp, %eax 59 xorl 8(%edx),%eax # use esp cookie 60 movl %eax, 8(%ecx) 61 movl %ebp, %eax 62 xorl 0(%edx),%eax # use ebp cookie 63 movl %eax,12(%ecx) 64 movl %esi,16(%ecx) 65 movl %edi,20(%ecx) 66 movl 4(%edx),%edx # load eip cookie over cookie address 67 xorl 0(%esp),%edx 68 movl %edx, 0(%ecx) 69 xorl %eax,%eax 70 ret 71END(sigsetjmp) 72 73ENTRY(siglongjmp) 74 movl 4(%esp),%edx 75 cmpl $0,28(%edx) 76 jz 1f 77 78 pushl 24(%edx) /* mask from sc_mask */ 79 pushl $3 /* how = SIG_SETMASK */ 80 subl $4,%esp 81 movl $(SYS_sigprocmask),%eax 82 int $0x80 83 addl $12,%esp 84 851: call 2f 862: popl %ecx 87 addl $__jmpxor-2b,%ecx # load cookie address 88 89 movl 4(%esp),%edx # reload in case sigprocmask failed 90 movl 8(%esp),%eax 91 movl 4(%edx),%ebx 92 movl 8(%edx),%esi # load xor'ed esp into safe register 93 xorl 8(%ecx),%esi # use esp cookie 94 movl %esi, %esp # un-xor'ed esp is safe to use 95 movl 12(%edx),%ebp 96 xorl 0(%ecx),%ebp # use ebp cookie 97 movl 16(%edx),%esi 98 movl 20(%edx),%edi 99 100 movl 4(%ecx),%ecx # load eip cookie over cookie address 101 xorl 0(%edx),%ecx 102 testl %eax,%eax 103 jnz 2f 104 incl %eax 1052: movl %ecx,0(%esp) 106 ret 107END(siglongjmp) 108