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longjmp.c revision 1.3 
      1 /*	$NetBSD: longjmp.c,v 1.3 2009/02/16 03:23:29 lukem 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "namespace.h"
     33 #include <sys/types.h>
     34 #include <ucontext.h>
     35 #include <signal.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 
     39 #include <machine/regnum.h>
     40 
     41 #define __LIBC12_SOURCE__
     42 #include <setjmp.h>
     43 #include <compat/include/setjmp.h>
     44 
     45 void
     46 __longjmp14(jmp_buf env, int val)
     47 {
     48 	struct sigcontext *sc = (void *)env;
     49 	ucontext_t uc;
     50 
     51 	/* Ensure non-zero SP and sigcontext magic number is present */
     52 	if (sc->sc_regs[_R_SP] == 0 || sc->sc_regs[_R_ZERO] != (mips_reg_t)0xACEDBADE)
     53 		goto err;
     54 
     55 	/* Ensure non-zero return value */
     56 	if (val == 0)
     57 		val = 1;
     58 
     59 	/*
     60 	 * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
     61 	 *
     62 	 * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
     63 	 * since libpthread may want to interpose on signal handling.
     64 	 */
     65 	uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
     66 
     67 	sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
     68 
     69 	/* Clear uc_link */
     70 	uc.uc_link = 0;
     71 
     72 	/* Save return value in context */
     73 	uc.uc_mcontext.__gregs[_R_V0] = val;
     74 
     75 	/* Copy saved registers */
     76 	uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[_R_S0];
     77 	uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[_R_S1];
     78 	uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[_R_S2];
     79 	uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[_R_S3];
     80 	uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[_R_S4];
     81 	uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[_R_S5];
     82 	uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[_R_S6];
     83 	uc.uc_mcontext.__gregs[_REG_S7] = sc->sc_regs[_R_S7];
     84 	uc.uc_mcontext.__gregs[_REG_S8] = sc->sc_regs[_R_S8];
     85 	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_regs[_R_SP];
     86 	uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[_R_RA];
     87 	uc.uc_mcontext.__gregs[_REG_EPC] = sc->sc_pc;
     88 
     89 	/* Copy FP state */
     90 	if (sc->sc_fpused) {
     91 		/* FP saved regs are $f20 .. $f31 */
     92 		memcpy(&uc.uc_mcontext.__fpregs.__fp_r.__fp_regs[20],
     93 		    &sc->sc_fpregs[20], 32 - 20);
     94 		uc.uc_mcontext.__fpregs.__fp_csr =
     95 		    sc->sc_fpregs[_R_FSR - _FPBASE];
     96 		/* XXX sc_fp_control */
     97 		uc.uc_flags |= _UC_FPU;
     98 	}
     99 
    100 	setcontext(&uc);
    101  err:
    102 	longjmperror();
    103 	abort();
    104 	/* NOTREACHED */
    105 }
    106