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__longjmp14.c revision 1.2 
      1 /*	$NetBSD: __longjmp14.c,v 1.2 2005/09/14 13:46:32 he 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.
      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 
     46 #define __LIBC12_SOURCE__
     47 #include <setjmp.h>
     48 #include <compat/include/setjmp.h>
     49 
     50 #include <stdio.h>
     51 #include <unistd.h>
     52 
     53 ssize_t _sys_write(int, void *, size_t);
     54 
     55 void
     56 __longjmp14(jmp_buf env, int val)
     57 {
     58 	ucontext_t uc;
     59 	struct sigcontext *sc = (void *)env;
     60 	register_t *regs = (void *)(sc + 1);
     61 	register register_t dp __asm__("r27");
     62 
     63 	/* Ensure non-zero SP */
     64 	if (sc->sc_sp == 0)
     65 		goto err;
     66 
     67 	/* Make return value non-zero */
     68 	if (val == 0)
     69 		val = 1;
     70 
     71 	/* Copy callee-saved regs */
     72 	regs -= 3;
     73 	uc.uc_mcontext.__gregs[3] = regs[3];
     74 	uc.uc_mcontext.__gregs[4] = regs[4];
     75 	uc.uc_mcontext.__gregs[5] = regs[5];
     76 	uc.uc_mcontext.__gregs[6] = regs[6];
     77 	uc.uc_mcontext.__gregs[7] = regs[7];
     78 	uc.uc_mcontext.__gregs[8] = regs[8];
     79 	uc.uc_mcontext.__gregs[9] = regs[9];
     80 	uc.uc_mcontext.__gregs[10] = regs[10];
     81 	uc.uc_mcontext.__gregs[11] = regs[11];
     82 	uc.uc_mcontext.__gregs[12] = regs[12];
     83 	uc.uc_mcontext.__gregs[13] = regs[13];
     84 	uc.uc_mcontext.__gregs[14] = regs[14];
     85 	uc.uc_mcontext.__gregs[15] = regs[15];
     86 	uc.uc_mcontext.__gregs[16] = regs[16];
     87 	uc.uc_mcontext.__gregs[17] = regs[17];
     88 	uc.uc_mcontext.__gregs[18] = regs[18];
     89 
     90 	/* Preserve the current value of DP */
     91 	uc.uc_mcontext.__gregs[27] = dp;
     92 
     93 	/* Set the desired return value. */
     94 	uc.uc_mcontext.__gregs[_REG_RET0] = val;
     95 
     96 	/*
     97 	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
     98 	 *
     99 	 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
    100 	 * since libpthread may want to interpose on signal handling.
    101 	 */
    102 	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
    103 
    104 	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
    105 
    106 	/* Clear uc_link */
    107 	uc.uc_link = 0;
    108 
    109 	/* Copy signal mask */
    110 	uc.uc_sigmask = sc->sc_mask;
    111 
    112 	/* Copy special regs */
    113 	uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps;
    114 	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp;
    115 	uc.uc_mcontext.__gregs[_REG_PCSQH] = sc->sc_pcsqh;
    116 	uc.uc_mcontext.__gregs[_REG_PCOQH] = sc->sc_pcoqh;
    117 	uc.uc_mcontext.__gregs[_REG_PCSQT] = sc->sc_pcsqt;
    118 	uc.uc_mcontext.__gregs[_REG_PCOQT] = sc->sc_pcoqt;
    119 
    120 	setcontext(&uc);
    121  err:
    122 	longjmperror();
    123 	abort();
    124 	/* NOTREACHED */
    125 }
    126