lib/libc/arch/alpha/gen/__longjmp14.c

   1 /*      $NetBSD: __longjmp14.c,v 1.7 2013/03/13 08:05:46 martin 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 }