_setjmp.S revision 1.9
1 1.9 martin /* $NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin Exp $ */ 2 1.4 christos 3 1.6 pk /*- 4 1.6 pk * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 1.6 pk * All rights reserved. 6 1.1 cgd * 7 1.6 pk * This code is derived from software contributed to The NetBSD Foundation 8 1.6 pk * by Paul Kranenburg. 9 1.1 cgd * 10 1.1 cgd * Redistribution and use in source and binary forms, with or without 11 1.1 cgd * modification, are permitted provided that the following conditions 12 1.1 cgd * are met: 13 1.1 cgd * 1. Redistributions of source code must retain the above copyright 14 1.1 cgd * notice, this list of conditions and the following disclaimer. 15 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 cgd * notice, this list of conditions and the following disclaimer in the 17 1.1 cgd * documentation and/or other materials provided with the distribution. 18 1.1 cgd * 19 1.6 pk * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.6 pk * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.6 pk * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.6 pk * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.6 pk * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.6 pk * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.6 pk * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.6 pk * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.6 pk * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.6 pk * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.6 pk * POSSIBILITY OF SUCH DAMAGE. 30 1.1 cgd */ 31 1.1 cgd 32 1.4 christos #include <machine/asm.h> 33 1.6 pk #include <machine/trap.h> 34 1.6 pk 35 1.1 cgd #if defined(LIBC_SCCS) && !defined(lint) 36 1.9 martin RCSID("$NetBSD: _setjmp.S,v 1.9 2011/04/30 23:41:12 martin Exp $") 37 1.1 cgd #endif /* LIBC_SCCS and not lint */ 38 1.1 cgd 39 1.1 cgd /* 40 1.1 cgd * C library -- _setjmp, _longjmp 41 1.1 cgd * 42 1.1 cgd * _longjmp(a,v) 43 1.1 cgd * will generate a "return(v?v:1)" from 44 1.1 cgd * the last call to 45 1.1 cgd * _setjmp(a) 46 1.1 cgd * The previous signal state is NOT restored. 47 1.1 cgd */ 48 1.1 cgd 49 1.1 cgd ENTRY(_setjmp) 50 1.9 martin /* store important globals, sigsetjmp compatible */ 51 1.9 martin st %g3, [%o0 + 16] 52 1.9 martin st %g2, [%o0 + 24] 53 1.9 martin st %g4, [%o0 + 48] 54 1.9 martin st %g7, [%o0 + 52] 55 1.9 martin 56 1.2 pk st %sp, [%o0+0] /* store caller's stack pointer */ 57 1.6 pk st %o7, [%o0+4] /* and the return pc */ 58 1.1 cgd retl 59 1.1 cgd clr %o0 ! return 0 60 1.1 cgd 61 1.1 cgd ENTRY(_longjmp) 62 1.6 pk sub %sp, 64, %sp ! set up a local stack frame 63 1.6 pk tst %o1 ! compute v ? v : 1 64 1.1 cgd be,a 0f 65 1.6 pk mov 1, %o1 66 1.1 cgd 0: 67 1.6 pk t ST_FLUSHWIN ! flush register windows out to the stack 68 1.6 pk 69 1.9 martin /* restore globals */ 70 1.9 martin ld [%o0 + 16], %g3 71 1.9 martin ld [%o0 + 24], %g2 72 1.9 martin ld [%o0 + 48], %g4 73 1.9 martin ld [%o0 + 52], %g7 74 1.9 martin 75 1.6 pk /* 76 1.6 pk * We restore the saved stack pointer to %fp, then issue 77 1.6 pk * a `restore' instruction which will reload the register 78 1.6 pk * window from the stack. 79 1.6 pk */ 80 1.6 pk ld [%o0+4], %o7 /* restore return pc */ 81 1.6 pk ld [%o0+0], %fp /* and stack pointer */ 82 1.6 pk 83 1.7 pk retl ! success, return %o1 84 1.6 pk restore %o1, 0, %o0 85
Indexes created Mon Oct 27 20:09:55 GMT 2025