/* $NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <machine/asm.h> #if defined(LIBC_SCCS) && !defined(lint) #if 0 RCSID("from: @(#)_setjmp.s 5.1 (Berkeley) 5/12/90") #else RCSID("$NetBSD: _setjmp.S,v 1.9 2013/07/16 22:12:20 matt Exp $") #endif #endif /* LIBC_SCCS and not lint */ /* * C library -- _setjmp, _longjmp * * _longjmp(a,v) * will generate a "return(v)" from * the last call to * _setjmp(a) * by restoring registers from the stack, * The previous signal state is NOT restored. */ ENTRY(_setjmp) movl 4(%sp),%a0 /* save area pointer */ clrl (%a0)+ /* no old onstack */ clrl (%a0)+ /* no old sigmask */ movl %sp,(%a0)+ /* save old SP */ movl %a6,(%a0)+ /* save old FP */ clrl (%a0)+ /* no old AP */ movl (%sp),(%a0)+ /* save old PC */ clrl (%a0)+ /* clear PS */ moveml #0x3CFC,(%a0) /* save other non-scratch regs */ clrl %d0 /* return zero */ rts END(_setjmp) ENTRY(_longjmp) movl 4(%sp),%a0 /* save area pointer */ addql #8,%a0 /* skip onstack/sigmask */ tstl (%a0) /* ensure non-zero SP */ jeq botch /* oops! */ movl 8(%sp),%d0 /* grab return value */ jne ok /* non-zero ok */ moveq #1,%d0 /* else make non-zero */ ok: movl (%a0)+,%sp /* restore SP */ movl (%a0)+,%a6 /* restore FP */ addql #4,%a0 /* skip AP */ movl (%a0)+,(%sp) /* restore PC */ moveml 4(%a0),#0x3CFC /* restore non-scratch regs */ rts botch: jbsr PIC_PLT(_C_LABEL(longjmperror)) stop #0 END(_longjmp) |