1/* $OpenBSD: setjmp.S,v 1.7 2016/05/29 22:39:21 guenther Exp $ */ 2/* $NetBSD: __setjmp14.S,v 1.1 2001/06/19 00:25:02 fvdl Exp $ */ 3 4/* 5 * Copyright (c) 2001 Wasabi Systems, Inc. 6 * All rights reserved. 7 * 8 * Written by Frank van der Linden for Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed for the NetBSD Project by 21 * Wasabi Systems, Inc. 22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 23 * or promote products derived from this software without specific prior 24 * written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 40#include "SYS.h" 41#include <machine/setjmp.h> 42 43 .section .openbsd.randomdata,"aw",@progbits 44 .align 8 45 .globl __jmpxor 46__jmpxor: 47 .zero 8*3 # (rbp, rsp, pc) 48 END(__jmpxor) 49 .type __jmpxor,@object 50 51/* 52 * C library -- _setjmp, _longjmp 53 * 54 * longjmp(a,v) 55 * will generate a "return(v)" from the last call to 56 * setjmp(a) 57 * by restoring registers from the stack. 58 * The previous signal state is restored. 59 */ 60 61ENTRY(setjmp) 62 movq %rdi,%r8 /* save jmpbuf addr */ 63 movl $1,%edi /* how = SIG_BLOCK */ 64 xorl %esi,%esi /* set = empty */ 65 movl $SYS_sigprocmask,%eax 66 syscall 67 movq %r8,%rdi /* restore jmpbuf addr */ 68 movq %rax,(_JB_SIGMASK * 8)(%rdi) 69 70 movq (%rsp),%r11 71 leaq __jmpxor(%rip),%rcx 72 movq %rbx,(_JB_RBX * 8)(%rdi) 73 movq %rbp,%rax 74 xorq (0*8)(%rcx),%rax 75 movq %rax,(_JB_RBP * 8)(%rdi) 76 movq %r12,(_JB_R12 * 8)(%rdi) 77 movq %r13,(_JB_R13 * 8)(%rdi) 78 movq %r14,(_JB_R14 * 8)(%rdi) 79 movq %r15,(_JB_R15 * 8)(%rdi) 80 movq %rsp,%rax 81 xorq (1*8)(%rcx),%rax 82 movq %rax,(_JB_RSP * 8)(%rdi) 83 movq %r11,%rax 84 xorq (2*8)(%rcx),%rax 85 movq %rax,(_JB_PC * 8)(%rdi) 86 xorq %rcx,%rcx 87 88 xorq %rax,%rax 89 ret 90END(setjmp) 91 92ENTRY(longjmp) 93 movq %rdi,%r12 94 movl %esi,%r8d 95 96 movq (_JB_SIGMASK * 8)(%rdi),%rsi /* get set from sc_mask */ 97 movl $3,%edi /* how = SIG_SETMASK */ 98 movl $SYS_sigprocmask,%eax 99 syscall 100 movl %r8d,%eax 101 102 leaq __jmpxor(%rip),%rcx 103 movq (_JB_RBX * 8)(%r12),%rbx 104 movq (_JB_RBP * 8)(%r12),%r11 105 xorq (0*8)(%rcx),%r11 106 movq %r11,%rbp 107 movq (_JB_R13 * 8)(%r12),%r13 108 movq (_JB_R14 * 8)(%r12),%r14 109 movq (_JB_R15 * 8)(%r12),%r15 110 movq (_JB_RSP * 8)(%r12),%r11 111 xorq (1*8)(%rcx),%r11 112 movq %r11,%rsp 113 movq (_JB_PC * 8)(%r12),%r11 114 xorq (2*8)(%rcx),%r11 115 movq (_JB_R12 * 8)(%r12),%r12 116 xorq %rcx,%rcx 117 118 testl %eax,%eax 119 jnz 1f 120 incl %eax 1211: movq %r11,0(%rsp) 122 ret 123END(longjmp) 124