1/* $NetBSD: setjmp.S,v 1.18 2024/04/04 00:46:41 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)setjmp.s 5.1 (Berkeley) 4/23/90 35 */ 36 37#include <machine/asm.h> 38#if defined(LIBC_SCCS) 39 RCSID("$NetBSD: setjmp.S,v 1.18 2024/04/04 00:46:41 riastradh Exp $") 40#endif 41 42/* 43 * C library -- _setjmp, _longjmp 44 * 45 * longjmp(a,v) 46 * will generate a "return(v)" from the last call to 47 * setjmp(a) 48 * by restoring registers from the stack. 49 * The previous signal state is restored. 50 */ 51 52/* 53 * setjmp(jmp_buf env@esp[4,8)) 54 * 55 * ELF symbol: __setjmp14, because the size of jmp_buf changed on some 56 * platforms in 1.4. 57 */ 58ENTRY(__setjmp14) 59 /* 60 * Save the callee-saves registers: %ebp, %ebx, %edi, %esi, 61 * plus %esp and the return address on the stack since it 62 * will be overwritten if the caller makes any subroutine 63 * calls before longjmp. 64 */ 65 movl 4(%esp),%ecx /* ecx := env */ 66 movl 0(%esp),%edx /* edx := return address */ 67 movl %edx,0(%ecx) 68 movl %ebx,4(%ecx) 69 movl %esp,8(%ecx) 70 movl %ebp,12(%ecx) 71 movl %esi,16(%ecx) 72 movl %edi,20(%ecx) 73 74 /* Get the signal mask. */ 75 leal 24(%ecx),%edx 76 77 PIC_PROLOGUE 78 pushl %edx /* oset (signal mask saved to) */ 79 pushl $0 /* set := NULL */ 80 pushl $0 /* how := 0 (ignored) */ 81#ifdef __PIC__ 82 call PIC_PLT(_C_LABEL(__sigprocmask14)) 83#else 84 call _C_LABEL(__sigprocmask14) 85#endif 86 addl $12,%esp /* pop sigprocmask args */ 87 PIC_EPILOGUE 88 89 xorl %eax,%eax /* return 0 first time around */ 90 ret 91END(__setjmp14) 92 93/* 94 * longjmp(jmp_buf env@esp[4,8), int val@[8,12)) 95 * 96 * ELF symbol: __longjmp14, because the size of jmp_buf changed on some 97 * platforms in 1.4. 98 */ 99ENTRY(__longjmp14) 100 /* 101 * Restore the callee-saves registers: %ebp, %ebx, %edi, %esi, 102 * plus %esp and the return address on the stack. 103 */ 104 movl 4(%esp),%edx /* edx := env */ 105 movl 8(%esp),%eax /* eax := val */ 106 movl 0(%edx),%ecx /* ecx := return address */ 107 movl 4(%edx),%ebx 108 movl 8(%edx),%esp 109 movl 12(%edx),%ebp 110 movl 16(%edx),%esi 111 movl 20(%edx),%edi 112 movl %ecx,0(%esp) /* restore return address */ 113 114 /* Restore the signal mask. */ 115 leal 24(%edx),%edx 116 117 pushl %eax /* save val@eax */ 118 119 PIC_PROLOGUE 120 pushl $0 /* oset := NULL */ 121 pushl %edx /* set (signal mask restored from) */ 122 pushl $3 /* how := SIG_SETMASK */ 123#ifdef __PIC__ 124 call PIC_PLT(_C_LABEL(__sigprocmask14)) 125#else 126 call _C_LABEL(__sigprocmask14) 127#endif 128 addl $12,%esp /* pop sigprocmask args */ 129 PIC_EPILOGUE 130 131 popl %eax /* restore val@eax */ 132 133 testl %eax,%eax /* val == 0? */ 134 jz 3f /* jump if val == 0 */ 135 ret /* return val@eax */ 136 1373: incl %eax /* val@eax := 1 */ 138 ret /* return val@eax */ 139END(__longjmp14) 140