_setjmp.S revision 85518
1/* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: Header: _setjmp.s,v 1.1 91/07/06 16:45:53 torek Exp 38 */ 39 40#if defined(LIBC_SCCS) && !defined(lint) 41#if 0 42 .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93" 43#else 44 RCSID("$NetBSD: _setjmp.S,v 1.4 1998/10/08 02:27:59 eeh Exp $") 45#endif 46#endif /* LIBC_SCCS and not lint */ 47 48#if defined(SYSLIBC_RCS) && !defined(lint) 49 .text 50 .asciz "$FreeBSD: head/lib/libc/sparc64/gen/_setjmp.S 85518 2001-10-26 05:40:07Z jake $" 51#endif /* SYSLIBC_RCS and not lint */ 52 53#include <machine/asm.h> 54 55/* 56 * C library -- _setjmp, _longjmp 57 * 58 * _longjmp(a,v) 59 * will generate a "return(v?v:1)" from 60 * the last call to 61 * _setjmp(a) 62 * by unwinding the call stack. 63 * The previous signal state is NOT restored. 64 */ 65 66#define JB_SP 0x0 67#define JB_PC 0x8 68#define JB_FP 0x10 69 70ENTRY(_setjmp) 71 stx %sp, [%o0 + JB_SP] /* store caller's stack pointer */ 72 stx %o7, [%o0 + JB_PC] /* ... return pc */ 73 stx %fp, [%o0 + JB_FP] /* ... and frame pointer */ 74 retl 75 clr %o0 ! return 0 76 77ENTRY(_longjmp) 78 mov 1, %g6 79 movrnz %o1, %o1, %g6 ! compute v ? v : 1 in a global register 80 mov %o0, %g1 ! save a in another global register 81 ldx [%g1 + JB_FP], %g7 /* get caller's frame */ 821: cmp %fp, %g7 ! compare against desired frame 83 bl,a 1b ! if below, 84 restore ! pop frame and loop 85 be,a 2f ! if there, 86 ldx [%g1 + JB_SP], %o2 ! fetch return %sp 87 88.Lbotch: 89 call CNAME(longjmperror) ! otherwise, went too far; bomb out 90 nop 91 illtrap 92 932: cmp %o2, %sp ! %sp must not decrease 94 bge,a 3f 95 mov %o2, %sp ! it is OK, put it in place 96 b,a .Lbotch 97 nop 983: ldx [%g1 + JB_PC], %o3 ! fetch pc 99 jmp %o3 + 8 ! success, return %g6 100 mov %g6, %o0 101 102