1/* 2 * Copyright (c) 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * This code is derived from software contributed to Berkeley by 18 * Computer Consoles Inc. 19 */ 20 21#if defined(LIBC_SCCS) && !defined(lint) 22 .asciz "@(#)_setjmp.s 1.3 (Berkeley) 06/27/88" 23#endif /* LIBC_SCCS and not lint */ 24 25/* 26 * C library -- _setjmp, _longjmp 27 * 28 * _longjmp(a,v) 29 * will generate a "return(v)" from 30 * the last call to 31 * _setjmp(a) 32 * by restoring registers from the stack, 33 * The previous signal state is NOT restored. 34 */ 35 36#include "DEFS.h" 37 38ENTRY(_setjmp, 0) 39 movl 4(fp),r0 40 movl (fp),(r0) # save frame pointer of caller 41 movl -8(fp),4(r0) # save pc of caller 42 clrl r0 43 ret 44 45ENTRY(_longjmp, 0) 46 movl 8(fp),r0 # return(v) 47 movl 4(fp),r1 # fetch buffer 48 tstl (r1) 49 beql botch 50loop: 51 cmpl (r1),(fp) 52 beql done 53 blssu botch 54 movl $loop,-8(fp) 55 ret # pop another frame 56 57done: 58 cmpb *-8(fp),reiins # returning to an "rei"? 59 bneq 1f 60 movab 3f,-8(fp) # do return w/ psl-pc pop 61 brw 2f 621: 63 movab 4f,-8(fp) # do standard return 642: 65 ret # unwind stack before signals enabled 663: 67 addl2 $8,sp # compensate for PSL-PC push 684: 69 jmp *4(r1) # done, return.... 70 71botch: 72 callf $4,_longjmperror 73 halt 74 75 .data 76reiins: rei 77