1/* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7#ifndef lint 8 .asciz "@(#)_setjmp.s 5.2 (Berkeley) 06/05/85" 9#endif not lint 10 11 12/* 13 * C library -- _setjmp, _longjmp 14 * 15 * _longjmp(a,v) 16 * will generate a "return(v)" from 17 * the last call to 18 * _setjmp(a) 19 * by restoring registers from the stack, 20 * The previous signal state is NOT restored. 21 */ 22 23#include "DEFS.h" 24 25ENTRY(_setjmp, 0) 26 movl 4(ap),r0 27 movl 12(fp),(r0) # save frame pointer of caller 28 movl 16(fp),4(r0) # save pc of caller 29 clrl r0 30 ret 31 32ENTRY(_longjmp, 0) 33 movl 8(ap),r0 # return(v) 34 movl 4(ap),r1 # fetch buffer 35 tstl (r1) 36 beql botch 37loop: 38 bitw $1,6(fp) # r0 saved? 39 beql 1f 40 movl r0,20(fp) 41 bitw $2,6(fp) # was r1 saved? 42 beql 2f 43 movl r1,24(fp) 44 brb 2f 451: 46 bitw $2,6(fp) # was r1 saved? 47 beql 2f 48 movl r1,20(fp) 492: 50 cmpl (r1),12(fp) 51 beql done 52 blssu botch 53 movl $loop,16(fp) 54 ret # pop another frame 55 56done: 57 cmpb *16(fp),reiins # returning to an "rei"? 58 bneq 1f 59 movab 3f,16(fp) # do return w/ psl-pc pop 60 brw 2f 611: 62 movab 4f,16(fp) # do standard return 632: 64 ret # unwind stack before signals enabled 653: 66 addl2 $8,sp # compensate for PSL-PC push 674: 68 jmp *4(r1) # done, return.... 69 70botch: 71 pushl $msgend-msg 72 pushl $msg 73 pushl $2 74 calls $3,_write 75 halt 76 77 .data 78msg: .ascii "_longjmp botch\n" 79msgend: 80reiins: rei 81