1/* $OpenBSD: _setjmp.S,v 1.5 2020/10/21 17:22:59 kettenis Exp $ */ 2/* $NetBSD: _setjmp.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 <machine/asm.h> 41#include <machine/setjmp.h> 42 43 .hidden __jmpxor 44 45/* 46 * C library -- _setjmp, _longjmp 47 * 48 * _longjmp(a,v) 49 * will generate a "return(v)" from the last call to 50 * _setjmp(a) 51 * by restoring registers from the stack. 52 * The previous signal state is NOT restored. 53 */ 54 55ENTRY(_setjmp) 56 RETGUARD_SETUP(_setjmp, r10) 57 movq (%rsp),%r11 58 leaq __jmpxor(%rip),%rcx 59 movq %rbx,(_JB_RBX * 8)(%rdi) 60 movq %rbp,%rax 61 xorq (0*8)(%rcx),%rax 62 movq %rax,(_JB_RBP * 8)(%rdi) 63 movq %r12,(_JB_R12 * 8)(%rdi) 64 movq %r13,(_JB_R13 * 8)(%rdi) 65 movq %r14,(_JB_R14 * 8)(%rdi) 66 movq %r15,(_JB_R15 * 8)(%rdi) 67 movq %rsp,%rax 68 xorq (1*8)(%rcx),%rax 69 movq %rax,(_JB_RSP * 8)(%rdi) 70 movq %r11,%rax 71 xorq (2*8)(%rcx),%rax 72 movq %rax,(_JB_PC * 8)(%rdi) 73 xorq %rcx,%rcx 74 stmxcsr (_JB_MXCSR * 8)(%rdi) 75 fnstcw (_JB_MXCSR * 8 + 4)(%rdi) 76 77 xorq %rax,%rax 78 RETGUARD_CHECK(_setjmp, r10) 79 ret 80END(_setjmp) 81 82ENTRY(_longjmp) 83 leaq __jmpxor(%rip),%rcx 84 movq (_JB_RSP * 8)(%rdi),%r11 85 xorq (1*8)(%rcx),%r11 86 movq %r11,%rsp 87 movq (_JB_PC * 8)(%rdi),%r11 88 xorq (2*8)(%rcx),%r11 89 movq %r11,0(%rsp) 90 RETGUARD_SETUP(_longjmp, r10) 91 ldmxcsr (_JB_MXCSR * 8)(%rdi) 92 fldcw (_JB_MXCSR * 8 + 4)(%rdi) 93 movq (_JB_RBX * 8)(%rdi),%rbx 94 movq (_JB_RBP * 8)(%rdi),%r11 95 xorq (0*8)(%rcx),%r11 96 movq %r11,%rbp 97 movq (_JB_R12 * 8)(%rdi),%r12 98 movq (_JB_R13 * 8)(%rdi),%r13 99 movq (_JB_R14 * 8)(%rdi),%r14 100 movq (_JB_R15 * 8)(%rdi),%r15 101 xorq %rcx,%rcx 102 103 movl %esi,%eax 104 testl %eax,%eax 105 jnz 1f 106 incl %eax 1071: RETGUARD_CHECK(_longjmp, r10) 108 ret 109END(_longjmp) 110