1/* 2 * Copyright (c) 1980 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 18#if defined(LIBC_SCCS) && !defined(lint) 19 .asciz "@(#)_setjmp.s 5.7 (Berkeley) 06/27/88" 20#endif /* LIBC_SCCS and not lint */ 21 22/* 23 * C library -- _setjmp, _longjmp 24 * 25 * _longjmp(a,v) 26 * will generate a "return(v)" from 27 * the last call to 28 * _setjmp(a) 29 * by restoring registers from the stack, 30 * The previous signal state is NOT restored. 31 */ 32 33#include "DEFS.h" 34 35ENTRY(_setjmp, 0) 36 movl 4(ap),r0 37 movl 12(fp),(r0) # save frame pointer of caller 38 movl 16(fp),4(r0) # save pc of caller 39 clrl r0 40 ret 41 42ENTRY(_longjmp, 0) 43 movl 8(ap),r0 # return(v) 44 movl 4(ap),r1 # fetch buffer 45 tstl (r1) 46 beql botch 47loop: 48 bitw $1,6(fp) # r0 saved? 49 beql 1f 50 movl r0,20(fp) 51 bitw $2,6(fp) # was r1 saved? 52 beql 2f 53 movl r1,24(fp) 54 brb 2f 551: 56 bitw $2,6(fp) # was r1 saved? 57 beql 2f 58 movl r1,20(fp) 592: 60 cmpl (r1),12(fp) 61 beql done 62 blssu botch 63 movl $loop,16(fp) 64 ret # pop another frame 65 66done: 67 cmpb *16(fp),reiins # returning to an "rei"? 68 bneq 1f 69 movab 3f,16(fp) # do return w/ psl-pc pop 70 brw 2f 711: 72 movab 4f,16(fp) # do standard return 732: 74 ret # unwind stack before signals enabled 753: 76 addl2 $8,sp # compensate for PSL-PC push 774: 78 jmp *4(r1) # done, return.... 79 80botch: 81 calls $0,_longjmperror 82 halt 83 84 .data 85reiins: rei 86