_setjmp.S revision 1.2
1 /* $NetBSD: _setjmp.S,v 1.2 1998/09/12 16:54:14 eeh Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp 40 */ 41 42 #include <machine/asm.h> 43 #include <machine/frame.h> 44 #if defined(LIBC_SCCS) && !defined(lint) 45 #if 0 46 .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93" 47 #else 48 RCSID("$NetBSD: _setjmp.S,v 1.2 1998/09/12 16:54:14 eeh Exp $") 49 #endif 50 #endif /* LIBC_SCCS and not lint */ 51 52 /* 53 * C library -- _setjmp, _longjmp 54 * 55 * _longjmp(a,v) 56 * will generate a "return(v?v:1)" from 57 * the last call to 58 * _setjmp(a) 59 * by unwinding the call stack. 60 * The previous signal state is NOT restored. 61 */ 62 63 ENTRY(_setjmp) 64 stx %sp, [%o0+0x00+BIAS] /* store caller's stack pointer */ 65 stx %o7, [%o0+0x08+BIAS] /* ... return pc */ 66 stx %fp, [%o0+0x10+BIAS] /* ... and frame pointer */ 67 retl 68 clr %o0 ! return 0 69 70 ENTRY(_longjmp) 71 mov 1, %g6 72 movrnz %o1, %o1, %g6 ! compute v ? v : 1 in a global register 73 mov %o0, %g1 ! save a in another global register 74 ldx [%g1+0x10], %g7 /* get caller's frame */ 75 1: 76 cmp %fp, %g7 ! compare against desired frame 77 bl,a 1b ! if below, 78 restore ! pop frame and loop 79 be,a 2f ! if there, 80 ldx [%g1+0], %o2 ! fetch return %sp 81 82 Lbotch: 83 call _C_LABEL(longjmperror) ! otherwise, went too far; bomb out 84 nop 85 unimp 0 86 87 2: 88 cmp %o2, %sp ! %sp must not decrease 89 bge,a 3f 90 mov %o2, %sp ! it is OK, put it in place 91 b,a Lbotch 92 3: 93 ldx [%g1+0x8], %o3 ! fetch pc 94 jmp %o3 + 8 ! success, return %g6 95 mov %g6, %o0 96 97
Indexes created Tue Oct 14 06:10:07 GMT 2025