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 1.4 (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 * previous signal mask, and doing a return. 34 */ 35 36#include "DEFS.h" 37 38ENTRY(setjmp, R6) 39 movl 4(fp),r6 # construct sigcontext 40 movab -8(sp),sp # space for current struct sigstack 41 pushal (sp) # get current values 42 pushl $0 # no new values 43 callf $16,_sigstack # pop args plus signal stack value 44 movl (sp)+,(r6) # save onsigstack status of caller 45 pushl $0 46 callf $8,_sigblock # get signal mask 47 movl r0,4(r6) # save signal mask of caller 48 addl3 $8,fp,8(r6) # save stack pointer of caller 49 movl (fp),12(r6) # save frame pointer of caller 50 movl -8(fp),20(r6) # save pc of caller 51 movpsl 24(r6) # save psl of caller 52 clrl r0 53 ret 54 55ENTRY(longjmp, 0) 56 movl 8(fp),r0 # return(v) 57 movl 4(fp),r1 # fetch buffer 58 tstl 12(r1) 59 beql botch 60loop: 61 cmpl 12(r1),(fp) 62 beql done 63 blssu botch 64 movl $loop,-8(fp) 65 ret # pop another frame 66 67done: 68 cmpb *-8(fp),reiins # returning to an "rei"? 69 bneq 1f 70 movab 3f,-8(fp) # do return w/ psl-pc pop 71 brw 2f 721: 73 movab 4f,-8(fp) # do standard return 742: 75 ret # unwind stack before signals enabled 763: 77 addl2 $8,sp # compensate for PSL-PC push 784: 79 pushl r1 # pointer to sigcontext 80 callf $4,_sigreturn # restore previous context 81 # we should never return 82 83botch: 84 callf $4,_longjmperror 85 halt 86 87 .data 88reiins: rei 89