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

   1 /*      $NetBSD: __longjmp14.c,v 1.4 2008/04/28 20:22:57 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
  40 #define __LIBC12_SOURCE__
  41 #include <setjmp.h>
  42 #include <compat/include/setjmp.h>
  43
  44 struct _jmp_buf {
  45         struct sigcontext jb_sc;
  46         register_t jb_regs[6];
  47 };
  48
  49 void
  50 __longjmp14(jmp_buf env, int val)
  51 {
  52         struct _jmp_buf *jb = (void *)env;
  53         ucontext_t uc;
  54
  55         /* Ensure non-zero SP */
  56         if (jb->jb_sc.sc_sp == 0)
  57                 goto err;
  58
  59         /* Ensure non-zero return value */
  60         if (val == 0)
  61                 val = -1;
  62
  63         /* Set _UC_SIGMASK and _UC_CPU */
  64         uc.uc_flags = _UC_SIGMASK | _UC_CPU;
  65
  66         /* Clear uc_link */
  67         uc.uc_link = 0;
  68
  69         /* Save return value in context */
  70         uc.uc_mcontext.__gregs[_REG_R0] = val;
  71
  72         /* Copy saved registers */
  73         uc.uc_mcontext.__gregs[_REG_AP] = jb->jb_sc.sc_ap;
  74         uc.uc_mcontext.__gregs[_REG_SP] = jb->jb_sc.sc_sp;
  75         uc.uc_mcontext.__gregs[_REG_FP] = jb->jb_sc.sc_fp;
  76         uc.uc_mcontext.__gregs[_REG_PC] = jb->jb_sc.sc_pc;
  77         uc.uc_mcontext.__gregs[_REG_PSL] = jb->jb_sc.sc_ps;
  78
  79         uc.uc_mcontext.__gregs[_REG_R6] = jb->jb_regs[0];
  80         uc.uc_mcontext.__gregs[_REG_R7] = jb->jb_regs[1];
  81         uc.uc_mcontext.__gregs[_REG_R8] = jb->jb_regs[2];
  82         uc.uc_mcontext.__gregs[_REG_R9] = jb->jb_regs[3];
  83         uc.uc_mcontext.__gregs[_REG_R10] = jb->jb_regs[4];
  84         uc.uc_mcontext.__gregs[_REG_R11] = jb->jb_regs[5];
  85
  86         /* Copy signal mask */
  87         uc.uc_sigmask = jb->jb_sc.sc_mask;
  88
  89         setcontext(&uc);
  90  err:
  91         longjmperror();
  92         abort();
  93         /* NOTREACHED */
  94 }