_setjmp.S revision 1.9
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 #if defined(LIBC_SCCS) && !defined(lint) 31 /* .asciz "@(#)_setjmp.s 8.1 (Berkeley) 6/4/93" */ 32 .asciz "$NetBSD: _setjmp.S,v 1.9 2003/08/07 16:42:31 agc Exp $" 33 #endif /* LIBC_SCCS and not lint */ 34 35 /* 36 * C library -- _setjmp, _longjmp 37 * 38 * _longjmp(a,v) 39 * will generate a "return(v)" from 40 * the last call to 41 * _setjmp(a) 42 * by restoring registers from the stack, 43 * The previous signal state is NOT restored. 44 * 45 * Even though we don't use sigreturn14, we still store things in a sigcontext 46 * in order to be consistent. 47 */ 48 49 #include "DEFS.h" 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 #ifdef __ELF__ 56 movl 8(%fp),16(%r0) # save ap of caller 57 clrl %r1 # clear arg count 58 bbc $13,6(%fp),1f # was this a callg? 59 addl3 $1,(%ap),%r1 # get real arg count+1 for calls 60 1: moval 24(%fp)[%r1],8(%r0) # save sp of caller 61 movpsl 24(%r0) # save current psl 62 movw 4(%fp),24(%r0) # save psw of caller 63 movq %r6,44(%r0) # save r6/r7 64 movq %r8,52(%r0) # save r8/r9 65 movq %r10,60(%r0) # save r10/r11 66 #endif 67 clrl %r0 68 ret 69 70 ENTRY(_longjmp, 0) 71 movl 8(%ap),%r0 # return(v) 72 movl 4(%ap),%r1 # fetch buffer 73 tstl 12(%r1) # is fp null 74 beql botch 75 #ifdef __ELF__ 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 #else 85 loop: 86 bitw $1,6(%fp) # %r0 saved? 87 beql 1f 88 movl %r0,20(%fp) 89 bitw $2,6(%fp) # was %r1 saved? 90 beql 2f 91 movl %r1,24(%fp) 92 brb 2f 93 1: 94 bitw $2,6(%fp) # was %r1 saved? 95 beql 2f 96 movl %r1,20(%fp) 97 2: 98 cmpl 12(%r1),12(%fp) 99 beql done 100 blssu botch 101 movab loop,16(%fp) 102 ret # pop another frame 103 104 done: 105 cmpb *16(%fp),$2 # returning to an "rei"? 106 bneq 1f 107 movab 3f,16(%fp) # do return w/ psl-pc pop 108 brw 2f 109 1: 110 movab 4f,16(%fp) # do standard return 111 2: 112 ret # unwind stack before signals enabled 113 3: 114 addl2 $8,%sp # compensate for PSL-PC push 115 4: 116 jmp *20(%r1) # done, return.... 117 #endif /* !__ELF__ */ 118 119 botch: 120 calls $0,_C_LABEL(longjmperror) 121 halt 122
Indexes created Fri Sep 26 08:10:20 GMT 2025