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__longjmp14.c revision 1.1 
      1 /*	$NetBSD: __longjmp14.c,v 1.1 2004/03/21 18:04:27 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christian Limpach and Matt Thomas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include "namespace.h"
     40 #include <sys/types.h>
     41 #include <ucontext.h>
     42 #include <signal.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 #include <machine/reg.h>
     46 #include <machine/alpha_cpu.h>
     47 
     48 #define __LIBC12_SOURCE__
     49 #include <setjmp.h>
     50 
     51 void
     52 __longjmp14(jmp_buf env, int val)
     53 {
     54 	struct sigcontext *sc = (void *)env;
     55 	ucontext_t uc;
     56 
     57 	/* Ensure non-zero SP */
     58 	if (sc->sc_sp == 0 || sc->sc_regs[R_ZERO] != 0xacedbade)
     59 		goto err;
     60 
     61 	/* Ensure non-zero return value */
     62 	if (val == 0)
     63 		val = -1;
     64 
     65 	/* Set _UC_SIGMASK and _UC_CPU */
     66 	uc.uc_flags = _UC_SIGMASK | _UC_CPU;
     67 
     68 	/* Clear uc_link */
     69 	uc.uc_link = 0;
     70 
     71 	/* Save return value in context */
     72 	uc.uc_mcontext.__gregs[_REG_V0] = val;
     73 
     74 	/* Copy saved registers */
     75         uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[R_S0];
     76         uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[R_S1];
     77         uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[R_S2];
     78         uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[R_S3];
     79         uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[R_S4];
     80         uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[R_S5];
     81         uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[R_S6];
     82         uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[R_RA];
     83         uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp;
     84         uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc;
     85         uc.uc_mcontext.__gregs[_REG_PS] =
     86 	   (sc->sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR;
     87 
     88 	/* Copy FP state */
     89         if (sc->sc_ownedfp) {
     90                 memcpy(&uc.uc_mcontext.__fpregs.__fp_fr,
     91                     &sc->sc_fpregs, 31 * sizeof(unsigned long));
     92                 sc->sc_fpcr = uc.uc_mcontext.__fpregs.__fp_fpcr;
     93                 /* XXX sc_fp_control */
     94                 uc.uc_flags |= _UC_FPU;
     95         }
     96 
     97 	/* Copy signal mask */
     98 	uc.uc_sigmask = sc->sc_mask;
     99 
    100 	setcontext(&uc);
    101  err:
    102 	longjmperror();
    103 	abort();
    104 	/* NOTREACHED */
    105 }
    106