1 1.9 matt /* $NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $ */ 2 1.2 thorpej 3 1.1 paulus /*- 4 1.1 paulus * Copyright (c) 1990 The Regents of the University of California. 5 1.1 paulus * All rights reserved. 6 1.1 paulus * 7 1.1 paulus * This code is derived from software contributed to Berkeley by 8 1.1 paulus * the Systems Programming Group of the University of Utah Computer 9 1.1 paulus * Science Department. 10 1.1 paulus * 11 1.1 paulus * Redistribution and use in source and binary forms, with or without 12 1.1 paulus * modification, are permitted provided that the following conditions 13 1.1 paulus * are met: 14 1.1 paulus * 1. Redistributions of source code must retain the above copyright 15 1.1 paulus * notice, this list of conditions and the following disclaimer. 16 1.1 paulus * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 paulus * notice, this list of conditions and the following disclaimer in the 18 1.1 paulus * documentation and/or other materials provided with the distribution. 19 1.7 agc * 3. Neither the name of the University nor the names of its contributors 20 1.1 paulus * may be used to endorse or promote products derived from this software 21 1.1 paulus * without specific prior written permission. 22 1.1 paulus * 23 1.1 paulus * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.1 paulus * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.1 paulus * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.1 paulus * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.1 paulus * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.1 paulus * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.1 paulus * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.1 paulus * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.1 paulus * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.1 paulus * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.1 paulus * SUCH DAMAGE. 34 1.1 paulus */ 35 1.1 paulus 36 1.3 thorpej #include <machine/asm.h> 37 1.2 thorpej 38 1.1 paulus #if defined(LIBC_SCCS) && !defined(lint) 39 1.2 thorpej #if 0 40 1.2 thorpej RCSID("from: @(#)_setjmp.s 5.1 (Berkeley) 5/12/90") 41 1.2 thorpej #else 42 1.9 matt RCSID("$NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $") 43 1.2 thorpej #endif 44 1.1 paulus #endif /* LIBC_SCCS and not lint */ 45 1.1 paulus 46 1.1 paulus /* 47 1.1 paulus * C library -- _setjmp, _longjmp 48 1.1 paulus * 49 1.1 paulus * _longjmp(a,v) 50 1.1 paulus * will generate a "return(v)" from 51 1.1 paulus * the last call to 52 1.1 paulus * _setjmp(a) 53 1.1 paulus * by restoring registers from the stack, 54 1.1 paulus * The previous signal state is NOT restored. 55 1.1 paulus */ 56 1.1 paulus 57 1.1 paulus ENTRY(_setjmp) 58 1.8 matt movl 4(%sp),%a0 /* save area pointer */ 59 1.8 matt clrl (%a0)+ /* no old onstack */ 60 1.8 matt clrl (%a0)+ /* no old sigmask */ 61 1.8 matt movl %sp,(%a0)+ /* save old SP */ 62 1.8 matt movl %a6,(%a0)+ /* save old FP */ 63 1.8 matt clrl (%a0)+ /* no old AP */ 64 1.8 matt movl (%sp),(%a0)+ /* save old PC */ 65 1.8 matt clrl (%a0)+ /* clear PS */ 66 1.8 matt moveml #0x3CFC,(%a0) /* save other non-scratch regs */ 67 1.6 thorpej clrl %d0 /* return zero */ 68 1.1 paulus rts 69 1.9 matt END(_setjmp) 70 1.1 paulus 71 1.1 paulus ENTRY(_longjmp) 72 1.8 matt movl 4(%sp),%a0 /* save area pointer */ 73 1.6 thorpej addql #8,%a0 /* skip onstack/sigmask */ 74 1.8 matt tstl (%a0) /* ensure non-zero SP */ 75 1.1 paulus jeq botch /* oops! */ 76 1.8 matt movl 8(%sp),%d0 /* grab return value */ 77 1.1 paulus jne ok /* non-zero ok */ 78 1.6 thorpej moveq #1,%d0 /* else make non-zero */ 79 1.1 paulus ok: 80 1.8 matt movl (%a0)+,%sp /* restore SP */ 81 1.8 matt movl (%a0)+,%a6 /* restore FP */ 82 1.6 thorpej addql #4,%a0 /* skip AP */ 83 1.8 matt movl (%a0)+,(%sp) /* restore PC */ 84 1.8 matt moveml 4(%a0),#0x3CFC /* restore non-scratch regs */ 85 1.1 paulus rts 86 1.1 paulus 87 1.1 paulus botch: 88 1.5 itohy jbsr PIC_PLT(_C_LABEL(longjmperror)) 89 1.1 paulus stop #0 90 1.9 matt END(_longjmp) 91