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      1 /*	$NetBSD: __longjmp14.c,v 1.8 2021/05/25 00:14:41 thorpej 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 #include <machine/reg.h>
     39 #include <machine/alpha_cpu.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 */
     52 	if (sc->sc_sp == 0 || sc->sc_regs[R_ZERO] != 0xacedbade)
     53 		goto err;
     54 
     55 	/* Ensure non-zero return value */
     56 	if (val == 0)
     57 		val = 1;
     58 
     59 	/* Set _UC_SIGMASK and _UC_CPU */
     60 	uc.uc_flags = _UC_SIGMASK | _UC_CPU;
     61 
     62 	/* Clear uc_link */
     63 	uc.uc_link = 0;
     64 
     65 	/* Save return value in context */
     66 	uc.uc_mcontext.__gregs[_REG_V0] = val;
     67 
     68 	/* Copy saved registers */
     69 	uc.uc_mcontext.__gregs[_REG_S0] = sc->sc_regs[R_S0];
     70 	uc.uc_mcontext.__gregs[_REG_S1] = sc->sc_regs[R_S1];
     71 	uc.uc_mcontext.__gregs[_REG_S2] = sc->sc_regs[R_S2];
     72 	uc.uc_mcontext.__gregs[_REG_S3] = sc->sc_regs[R_S3];
     73 	uc.uc_mcontext.__gregs[_REG_S4] = sc->sc_regs[R_S4];
     74 	uc.uc_mcontext.__gregs[_REG_S5] = sc->sc_regs[R_S5];
     75 	uc.uc_mcontext.__gregs[_REG_S6] = sc->sc_regs[R_S6];
     76 	uc.uc_mcontext.__gregs[_REG_RA] = sc->sc_regs[R_RA];
     77 	uc.uc_mcontext.__gregs[_REG_GP] = sc->sc_regs[R_GP];
     78 	uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp;
     79 	uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc;
     80 	uc.uc_mcontext.__gregs[_REG_PS] =
     81 	   (sc->sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR;
     82 
     83 	/* Copy FP state */
     84 	if (sc->sc_ownedfp) {
     85 		memcpy(&uc.uc_mcontext.__fpregs.__fp_fr,
     86 		    &sc->sc_fpregs, 31 * sizeof(unsigned long));
     87 		uc.uc_mcontext.__fpregs.__fp_fpcr = sc->sc_fpcr;
     88 		/* XXX sc_fp_control */
     89 		uc.uc_flags |= _UC_FPU;
     90 	}
     91 
     92 	/* Copy signal mask */
     93 	uc.uc_sigmask = sc->sc_mask;
     94 
     95 	setcontext(&uc);
     96  err:
     97 	longjmperror();
     98 	abort();
     99 	/* NOTREACHED */
    100 }
    101