1/* $OpenBSD: sigsetjmp.S,v 1.17 2016/09/22 18:23:58 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 -- sigsetjmp, siglongjmp 36 * 37 * siglongjmp(a,v) 38 * will generate a "return(v)" from the last call to 39 * sigsetjmp(a,savemask) 40 * by restoring registers from the stack, as well as the signal mask if the 41 * `savemask' parameter was non-zero. 42 * 43 * For m88k, we define our sigjmp_buf length to be the size of 22 (_JBLEN + 1) 44 * longs. The buffer layout is as follows: 45 * 46 * sigjmp_buf[0] return address 47 * sigjmp_buf[1] signal set (if used) 48 * sigjmp_buf[2 to 19] r14 to r31 49 * sigjmp_buf[20] setjmp type 50 * sigjmp_buf[21] value of `savemask' parameter 51 */ 52 53#define SIGSETJMP_SIG 0x582e 54 55/* 56int sigsetjmp(sigjmp_buf env, int savemask); 57 */ 58ENTRY(sigsetjmp) 59 st %r1, %r2,0 /* save registers to the environment buffer */ 60 st %r14,%r2,8 61 st %r15,%r2,12 62 st %r16,%r2,16 63 st %r17,%r2,20 64 st %r18,%r2,24 65 st %r19,%r2,28 66 st %r20,%r2,32 67 st %r21,%r2,36 68 st %r22,%r2,40 69 st %r23,%r2,44 70 st %r24,%r2,48 71 st %r25,%r2,52 72 st %r26,%r2,56 73 st %r27,%r2,60 74 st %r28,%r2,64 75 st %r29,%r2,68 76 st %r30,%r2,72 77 st %r31,%r2,76 78 or %r4,%r0,SIGSETJMP_SIG /* r4 now contains setjmp type */ 79 st %r4,%r2,80 /* setjmp type to _setjmp */ 80 bcnd.n eq0,%r3,1f /* skip signal stuff if savemask == 0 */ 81 st %r3,%r2,84 /* save `savemask' value */ 82 83 or %r4,%r2,0 /* save r2 in r4 */ 84 or %r3,%r0,0 /* set = empty */ 85 or %r2,%r0,1 /* how = SIG_BLOCK */ 86 __DO_SYSCALL(sigprocmask) 87 or %r0,%r0,%r0 /* NOP to fill error case of syscall */ 88 st %r2,%r4,4 /* save signal set in offset 4 of env */ 89 ld %r1,%r4,0 901: 91 jmp.n %r1 /* return 0 */ 92 or %r2,%r0,0 93END(sigsetjmp) 94 95/* 96void siglongjmp(sigjmp_buf env, int val); 97 */ 98ENTRY(siglongjmp) 99 bcnd eq0,%r2,2f /* check for bad environment buffer address. */ 100 ld %r4,%r2,80 /* check setjmp type. */ 101 cmp %r4,%r4,SIGSETJMP_SIG /* should be SIGSETJMP_SIG */ 102 bb1 ne,%r4,2f /* if != SIGSETJMP_SIG, abort. */ 103 104 ld %r14,%r2,8 /* restore registers from the environment buffer */ 105 ld %r15,%r2,12 106 ld %r16,%r2,16 107 ld %r17,%r2,20 108 ld %r18,%r2,24 109 ld %r19,%r2,28 110 ld %r20,%r2,32 111 ld %r21,%r2,36 112 ld %r22,%r2,40 113 ld %r23,%r2,44 114 ld %r24,%r2,48 115 ld %r25,%r2,52 116 ld %r26,%r2,56 117 ld %r27,%r2,60 118 ld %r28,%r2,64 119 ld %r29,%r2,68 120 ld %r30,%r2,72 121 ld %r4,%r2,84 /* get `savemask' value */ 122 bcnd.n eq0,%r4,1f 123 ld %r31,%r2,76 124 125 or %r4,%r2,0 /* save r2 in r4 */ 126 or %r5,%r3,0 /* and r3 in r5 */ 127 ld %r3,%r2,4 /* load the saved mask into r3 */ 128 or %r2,%r0,3 /* how = SIG_SETMASK */ 129 __DO_SYSCALL(sigprocmask) 130 or %r0,%r0,%r0 /* NOP to fill error case of syscall */ 131 or %r2,%r4,0 /* restore r2 */ 132 or %r3,%r5,0 /* restore r3 */ 133 1341: 135 bcnd.n ne0,%r3,1f 136 ld %r1,%r2,0 /* restore r1 */ 137 or %r3,%r0,1 /* never return zero! */ 1381: 139 jmp.n %r1 140 or %r2,%r3,%r0 141 1422: br _HIDDEN(abort) /* NO RETURN */ 143END(siglongjmp) 144