1/* $NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos 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 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <machine/asm.h> 37 38#if defined(LIBC_SCCS) && !defined(lint) 39#if 0 40 RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90") 41#else 42 RCSID("$NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $") 43#endif 44#endif /* LIBC_SCCS and not lint */ 45 46/* 47 * C library -- setjmp, longjmp 48 * 49 * longjmp(a,v) 50 * will generate a "return(v)" from 51 * the last call to 52 * setjmp(a) 53 * by restoring registers from the stack, 54 * and a struct sigcontext, see <signal.h> 55 */ 56 57ENTRY(__setjmp14) 58 /* Get signal stack info. Note overlay of ss_sp and ss_size! */ 59 lea %sp@(-12),%sp /* sizeof(stack_t) */ 60 clrl %sp@ /* ss = NULL */ 61 movl %sp,%sp@(4) /* oss = stack_t on stack */ 62 jbsr PIC_PLT(_C_LABEL(__sigaltstack14)) 63 64 movl %sp@(8),%d0 /* ss_flags */ 65 andl #1,%d0 /* extract SS_ONSTACK */ 66 lea %sp@(12),%sp /* pop stack_t */ 67 68 /* Get pointer to jmp_buf; a sigcontext is at the beginning. */ 69 movl %sp@(4),%a0 70 movl %d0,%a0@ /* store onstack */ 71 clrl %a0@(4) /* unused word (old style signal mask) */ 72 73 /* Get the signal mask. */ 74 pea %a0@(28) /* oset = &sc.sc_mask */ 75 movl #0,%sp@- /* set = NULL */ 76 movl #0,%sp@- /* action = 0 <ignored> */ 77 jbsr PIC_PLT(_C_LABEL(__sigprocmask14)) 78 addl #12,%sp 79 80 movl %sp@(4),%a0 /* get jmp_buf pointer again */ 81 lea %sp@(4),%a1 /* adjust SP since we won't rts */ 82 movl %a1,%a0@(8) /* save SP */ 83 movl %a6,%a0@(12) /* save FP */ 84 clrl %a0@(16) /* no AP */ 85 movl %sp@,%a0@(20) /* save return PC */ 86 clrl %a0@(24) /* clear PS */ 87 88 /* Save remaining non-scratch regs after signal mask. */ 89 moveml #0x3CFC,%a0@(44) 90 91 clrl %d0 /* return 0 */ 92 rts 93 94