_setjmp.S revision 1.11
1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include "DEFS.h" 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 /* .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93" */ 34 RCSID("$NetBSD: _setjmp.S,v 1.11 2024/06/29 06:52:34 rin Exp $") 35 #endif /* LIBC_SCCS and not lint */ 36 37 /* 38 * C library -- _setjmp, _longjmp 39 * 40 * _longjmp(a,v) 41 * will generate a "return(v)" from 42 * the last call to 43 * _setjmp(a) 44 * by restoring registers from the stack, 45 * The previous signal state is NOT restored. 46 * 47 * Even though we don't use sigreturn14, we still store things in a sigcontext 48 * in order to be consistent. 49 */ 50 51 ENTRY(_setjmp, R6) 52 movl 4(%ap),%r0 53 movl 12(%fp),12(%r0) # save frame pointer of caller 54 movl 16(%fp),20(%r0) # save pc of caller 55 movl 8(%fp),16(%r0) # save ap of caller 56 clrl %r1 # clear arg count 57 bbc $13,6(%fp),1f # was this a callg? 58 addl3 $1,(%ap),%r1 # get real arg count+1 for calls 59 1: moval 24(%fp)[%r1],8(%r0) # save sp of caller 60 movpsl 24(%r0) # save current psl 61 movw 4(%fp),24(%r0) # save psw of caller 62 movq %r6,44(%r0) # save r6/r7 63 movq %r8,52(%r0) # save r8/r9 64 movq %r10,60(%r0) # save r10/r11 65 clrl %r0 66 ret 67 END(_setjmp) 68 69 ENTRY(_longjmp, 0) 70 movl 8(%ap),%r0 # return(v) 71 jneq 1f 72 movl $1,%r0 73 1: movl 4(%ap),%r1 # fetch buffer 74 tstl 12(%r1) # is fp null 75 beql botch 76 movq 44(%r1),%r6 # restore r6/r7 77 movq 52(%r1),%r8 # restore r8/r9 78 movq 60(%r1),%r10 # restore r10/r11 79 movl 16(%r1),%ap # restore ap 80 movl 8(%r1),%sp # restore sp 81 movl 12(%r1),%fp # restore fp 82 movq 20(%r1),-(%sp) # save pc/psl to new stack 83 rei # and go back to saved pc/psl 84 85 botch: 86 calls $0,_C_LABEL(longjmperror) 87 halt 88 END(_longjmp) 89
Indexes created Sat Sep 27 22:09:54 GMT 2025