1/* $OpenBSD: _setjmp.S,v 1.13 2016/05/23 00:18:57 guenther Exp $ */ 2/*- 3 * Copyright (c) 2002 Steve Murphree, Jr. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Steve Murphree, Jr. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include "SYS.h" 33 34/* 35 * C library -- _setjmp, _longjmp 36 * 37 * _longjmp(a,v) 38 * will generate a "return(v)" from the last call to 39 * _setjmp(a) 40 * by restoring registers from the stack. The previous signal state is 41 * neither saved nor restored. 42 * 43 * For m88k, we define our jmp_buf length to be the size of 21 (_JBLEN) longs. 44 * The buffer layout is as follows: 45 * 46 * jmp_buf[0] return address 47 * jmp_buf[1] unused 48 * jmp_buf[2 to 19] r14 to r31 49 * jmp_buf[20] setjmp type 50 */ 51 52#define U_SETJMP_SIG 0x1764 53 54/* 55int _setjmp(jmp_buf env); 56 */ 57ENTRY(_setjmp) 58 st %r1, %r2,0 /* save registers to the environment buffer */ 59 st %r14,%r2,8 60 st %r15,%r2,12 61 st %r16,%r2,16 62 st %r17,%r2,20 63 st %r18,%r2,24 64 st %r19,%r2,28 65 st %r20,%r2,32 66 st %r21,%r2,36 67 st %r22,%r2,40 68 st %r23,%r2,44 69 st %r24,%r2,48 70 st %r25,%r2,52 71 st %r26,%r2,56 72 st %r27,%r2,60 73 st %r28,%r2,64 74 st %r29,%r2,68 75 st %r30,%r2,72 76 st %r31,%r2,76 77 or %r4,%r0,U_SETJMP_SIG /* setjmp type to _setjmp */ 78 st %r4,%r2,80 79 jmp.n %r1 80 or %r2,%r0,0 /* return 0 */ 81END(_setjmp) 82 83/* 84void _longjmp(jmp_buf env, int val); 85 */ 86ENTRY(_longjmp) 87 bcnd eq0,%r2,2f /* check for bad environment buffer address. */ 88 ld %r4,%r2,80 /* check setjmp type. */ 89 cmp %r4,%r4,U_SETJMP_SIG /* should be U_SETJMP_SIG */ 90 bb1 ne,%r4,2f /* if != U_SETJMP_SIG, abort. */ 91 92 ld %r14,%r2,8 /* restore registers from the environment buffer */ 93 ld %r15,%r2,12 94 ld %r16,%r2,16 95 ld %r17,%r2,20 96 ld %r18,%r2,24 97 ld %r19,%r2,28 98 ld %r20,%r2,32 99 ld %r21,%r2,36 100 ld %r22,%r2,40 101 ld %r23,%r2,44 102 ld %r24,%r2,48 103 ld %r25,%r2,52 104 ld %r26,%r2,56 105 ld %r27,%r2,60 106 ld %r28,%r2,64 107 ld %r29,%r2,68 108 ld %r30,%r2,72 109 ld %r31,%r2,76 110 ld %r1,%r2,0 /* restore r1 */ 111 bcnd.n ne0,%r3,1f 112 or %r2,%r3,%r0 113 or %r2,%r0,1 /* never return zero! */ 1141: jmp %r1 115 1162: subu %r31,%r31,16 /* get a temporary stack */ 117 st %r1,%r31,0 /* save r1 on stack (return address) */ 118#ifdef __PIC__ 119 bsr _libc_abort#plt /* NO RETURN */ 120#else 121 bsr _libc_abort /* NO RETURN */ 122#endif 123 ld %r1,%r31,0 /* restore r1 from stack */ 124 jmp.n %r1 /* this should not happen but we are prepared */ 125 addu %r31,%r31,16 /* restore the stack */ 126END(_longjmp) 127