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. 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: _setjmp.S,v 1.8 2002/03/30 04:58:36 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 * The previous signal state is NOT restored. 48 * 49 * Even though we don't use sigreturn14, we still store things in a sigcontext 50 * in order to be consistent. 51 */ 52 53#include "DEFS.h" 54 55ENTRY(_setjmp, R6) 56 movl 4(%ap),%r0 57 movl 12(%fp),12(%r0) # save frame pointer of caller 58 movl 16(%fp),20(%r0) # save pc of caller 59#ifdef __ELF__ 60 movl 8(%fp),16(%r0) # save ap of caller 61 clrl %r1 # clear arg count 62 bbc $13,6(%fp),1f # was this a callg? 63 addl3 $1,(%ap),%r1 # get real arg count+1 for calls 641: moval 24(%fp)[%r1],8(%r0) # save sp of caller 65 movpsl 24(%r0) # save current psl 66 movw 4(%fp),24(%r0) # save psw of caller 67 movq %r6,44(%r0) # save r6/r7 68 movq %r8,52(%r0) # save r8/r9 69 movq %r10,60(%r0) # save r10/r11 70#endif 71 clrl %r0 72 ret 73 74ENTRY(_longjmp, 0) 75 movl 8(%ap),%r0 # return(v) 76 movl 4(%ap),%r1 # fetch buffer 77 tstl 12(%r1) # is fp null 78 beql botch 79#ifdef __ELF__ 80 movq 44(%r1),%r6 # restore r6/r7 81 movq 52(%r1),%r8 # restore r8/r9 82 movq 60(%r1),%r10 # restore r10/r11 83 movl 16(%r1),%ap # restore ap 84 movl 8(%r1),%sp # restore sp 85 movl 12(%r1),%fp # restore fp 86 movq 20(%r1),-(%sp) # save pc/psl to new stack 87 rei # and go back to saved pc/psl 88#else 89loop: 90 bitw $1,6(%fp) # %r0 saved? 91 beql 1f 92 movl %r0,20(%fp) 93 bitw $2,6(%fp) # was %r1 saved? 94 beql 2f 95 movl %r1,24(%fp) 96 brb 2f 971: 98 bitw $2,6(%fp) # was %r1 saved? 99 beql 2f 100 movl %r1,20(%fp) 1012: 102 cmpl 12(%r1),12(%fp) 103 beql done 104 blssu botch 105 movab loop,16(%fp) 106 ret # pop another frame 107 108done: 109 cmpb *16(%fp),$2 # returning to an "rei"? 110 bneq 1f 111 movab 3f,16(%fp) # do return w/ psl-pc pop 112 brw 2f 1131: 114 movab 4f,16(%fp) # do standard return 1152: 116 ret # unwind stack before signals enabled 1173: 118 addl2 $8,%sp # compensate for PSL-PC push 1194: 120 jmp *20(%r1) # done, return.... 121#endif /* !__ELF__ */ 122 123botch: 124 calls $0,_C_LABEL(longjmperror) 125 halt 126