1/* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Computer Consoles Inc. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11#if defined(LIBC_SCCS) && !defined(lint) 12 .asciz "@(#)setjmp.s 8.1 (Berkeley) 06/04/93" 13#endif /* LIBC_SCCS and not lint */ 14 15/* 16 * C library -- setjmp, longjmp 17 * 18 * longjmp(a,v) 19 * will generate a "return(v)" from 20 * the last call to 21 * setjmp(a) 22 * by restoring registers from the stack, 23 * previous signal mask, and doing a return. 24 */ 25 26#include "DEFS.h" 27 28ENTRY(setjmp, R6) 29 movl 4(fp),r6 # construct sigcontext 30 movab -8(sp),sp # space for current struct sigstack 31 pushal (sp) # get current values 32 pushl $0 # no new values 33 callf $16,_sigstack # pop args plus signal stack value 34 movl (sp)+,(r6) # save onsigstack status of caller 35 pushl $0 36 callf $8,_sigblock # get signal mask 37 movl r0,4(r6) # save signal mask of caller 38 addl3 $8,fp,8(r6) # save stack pointer of caller 39 movl (fp),12(r6) # save frame pointer of caller 40 movl -8(fp),20(r6) # save pc of caller 41 movpsl 24(r6) # save psl 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 12(r1) 49 beql botch 50loop: 51 cmpl 12(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 pushl r1 # pointer to sigcontext 70 callf $4,_sigreturn # restore previous context 71 # we should never return 72 73botch: 74 callf $4,_longjmperror 75 halt 76 77 .data 78reiins: rei 79