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longjmp.c revision 1.1 
      1 /*	$NetBSD: longjmp.c,v 1.1 2005/09/17 11:49:39 tsutsui 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 
     46 #include <machine/regnum.h>
     47 
     48 #define __LIBC12_SOURCE__
     49 #include <setjmp.h>
     50 #include <compat/include/setjmp.h>
     51 
     52 void
     53 __longjmp14(jmp_buf env, int val)
     54 {
     55 	struct sigcontext *sc = (void *)env;
     56 	ucontext_t uc;
     57 
     58 	/* Ensure non-zero SP and sigcontext magic number is present */
     59 	if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != 0xACEDBADE)
     60 		goto err;
     61 
     62 	/* Ensure non-zero return value */
     63 	if (val == 0)
     64 		val = 1;
     65 
     66 	/*
     67 	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
     68 	 *
     69 	 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
     70 	 * since libpthread may want to interpose on signal handling.
     71 	 */
     72 	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
     73 
     74 	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
     75 
     76 	/* Clear uc_link */
     77 	uc.uc_link = 0;
     78 
     79 	/* Save return value in context */
     80 	uc.uc_mcontext.__gregs[_R_V0] = val;
     81 
     82 	/* Copy saved registers */
     83 	uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0];
     84 	uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1];
     85 	uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2];
     86 	uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3];
     87 	uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4];
     88 	uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5];
     89 	uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6];
     90 	uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7];
     91 	uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8];
     92 	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP];
     93 	uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA];
     94 	uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc;
     95 
     96 	/* Copy FP state */
     97 	if (sc->sc_fpused) {
     98 		/* FP saved regs are $f20 .. $f31 */
     99 		memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20],
    100 		    &sc->sc_fpregs[20], 32 - 20);
    101 		uc.uc_mcontext.__fpregs.__fp_csr =
    102 		    sc->sc_fpregs[_R_FSR - _FPBASE];
    103 		/* XXX sc_fp_control */
    104 		uc.uc_flags |= _UC_FPU;
    105 	}
    106 
    107 	setcontext(&uc);
    108  err:
    109 	longjmperror();
    110 	abort();
    111 	/* NOTREACHED */
    112 }
    113