1/*- 2 * Copyright (c) 2002 Peter Grehan. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26/* $NetBSD: setjmp.S,v 1.3 1998/10/03 12:30:38 tsubai Exp $ */ 27 28#include <machine/asm.h> 29__FBSDID("$FreeBSD$"); 30 31#include <sys/syscall.h> 32 33/* 34 * C library -- setjmp, longjmp 35 * 36 * longjmp(a,v) 37 * will generate a "return(v?v:1)" from the last call to 38 * setjmp(a) 39 * by restoring registers from the stack. 40 * The previous signal state is restored. 41 * 42 * jmpbuf layout: 43 * +------------+ 44 * | unused | 45 * +------------+ 46 * | sig state | 47 * | | 48 * | (4 words) | 49 * | | 50 * +------------+ 51 * | saved regs | 52 * | ... | 53 */ 54 55ENTRY(setjmp) 56 mr %r6,%r3 57 li %r3,1 /* SIG_BLOCK, but doesn't matter */ 58 /* since set == NULL */ 59 li %r4,0 /* set = NULL */ 60 mr %r5,%r6 /* &oset */ 61 addi %r5,%r5,4 62 li %r0, SYS_sigprocmask /*sigprocmask(SIG_BLOCK, NULL, &oset)*/ 63 sc /*assume no error XXX */ 64 mflr %r11 /* r11 <- link reg */ 65 mfcr %r12 /* r12 <- condition reg */ 66 mr %r10,%r1 /* r10 <- stackptr */ 67 mr %r9,%r2 /* r9 <- global ptr */ 68 stmw %r9,20(%r6) 69 li %r3,0 /* return (0) */ 70 blr 71 72 .weak CNAME(longjmp) 73 .set CNAME(longjmp),CNAME(__longjmp) 74ENTRY(__longjmp) 75 lmw %r9,20(%r3) /* restore regs */ 76 mr %r6,%r4 /* save val param */ 77 mtlr %r11 /* r11 -> link reg */ 78 mtcr %r12 /* r12 -> condition reg */ 79 mr %r2,%r9 /* r9 -> global ptr */ 80 mr %r1,%r10 /* r10 -> stackptr */ 81 mr %r4,%r3 82 li %r3,3 /* SIG_SETMASK */ 83 addi %r4,%r4,4 /* &set */ 84 li %r5,0 /* oset = NULL */ 85 li %r0,SYS_sigprocmask /* sigprocmask(SIG_SET, &set, NULL) */ 86 sc /* assume no error XXX */ 87 or. %r3,%r6,%r6 88 bnelr 89 li %r3,1 90 blr 91 92 .section .note.GNU-stack,"",%progbits 93