__setjmp14.S revision 1.4
1 /* 2 * Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /* .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" */ 36 .asciz "$NetBSD: __setjmp14.S,v 1.4 2000/06/28 19:20:17 matt Exp $" 37 #endif /* LIBC_SCCS and not lint */ 38 39 /* 40 * C library -- setjmp, longjmp 41 * 42 * longjmp(a,v) 43 * will generate a "return(v)" from 44 * the last call to 45 * setjmp(a) 46 * by restoring registers from the stack, 47 * and a struct sigcontext, see <signal.h> 48 */ 49 50 #include "DEFS.h" 51 52 ENTRY(__setjmp14, R6) 53 movl 4(ap),r6 # construct sigcontext 54 subl2 $12,sp # space for current struct sigstack 55 pushl sp # get current values 56 pushl $0 # no new values 57 calls $4,_C_LABEL(__sigaltstack14) # pop args plus signal stack value 58 movl (sp)+,(r6)+ # save onsigstack status of caller 59 pushal 24(r6) 60 pushl $0 61 pushl $0 62 calls $3,_C_LABEL(__sigprocmask14) # get signal mask 63 addl2 $4,r6 # skip old mask 64 movl (ap),r0 65 moval 4(ap)[r0],(r6)+ # save sp of caller 66 movl 12(fp),(r6)+ # save frame pointer of caller 67 movl 8(fp),(r6)+ # save argument pointer of caller 68 movl 16(fp),(r6)+ # save pc of caller 69 movpsl (r6) # save psl of caller 70 movw 4(fp),(r6) 71 clrl r0 72 ret 73 74 ENTRY(__longjmp14, 0) 75 movl 8(ap),r0 # return(v) 76 movl 4(ap),r1 # fetch buffer 77 tstl 12(r1) 78 beql botch 79 loop: 80 cmpl 12(r1),fp # are we there yet? 81 beql done 82 blssu botch 83 moval 20(fp),r2 84 blbc 6(fp),1f # was r0 saved? 85 movl r0,(r2)+ 86 1: 87 bbc $1,6(fp),2f # was r1 saved? 88 movl r1,(r2) 89 2: 90 movab loop,16(fp) 91 ret # pop another frame 92 93 done: 94 pushl r1 # pointer to sigcontext 95 calls $1,_C_LABEL(__sigreturn14) # restore previous context 96 # we should never return 97 botch: 98 calls $0,_C_LABEL(longjmperror) 99 halt 100
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