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

   1 /*      $NetBSD: __longjmp14.c,v 1.3 2005/12/24 21:41:01 perry 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.
   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 #define __LIBC12_SOURCE__
  40 #include <setjmp.h>
  41 #include <compat/include/setjmp.h>
  42
  43 #include <stdio.h>
  44 #include <unistd.h>
  45
  46 ssize_t _sys_write(int, void *, size_t);
  47
  48 void
  49 __longjmp14(jmp_buf env, int val)
  50 {
  51         ucontext_t uc;
  52         struct sigcontext *sc = (void *)env;
  53         register_t *regs = (void *)(sc + 1);
  54         register register_t dp __asm("r27");
  55
  56         /* Ensure non-zero SP */
  57         if (sc->sc_sp == 0)
  58                 goto err;
  59
  60         /* Make return value non-zero */
  61         if (val == 0)
  62                 val = 1;
  63
  64         /* Copy callee-saved regs */
  65         regs -= 3;
  66         uc.uc_mcontext.__gregs[3] = regs[3];
  67         uc.uc_mcontext.__gregs[4] = regs[4];
  68         uc.uc_mcontext.__gregs[5] = regs[5];
  69         uc.uc_mcontext.__gregs[6] = regs[6];
  70         uc.uc_mcontext.__gregs[7] = regs[7];
  71         uc.uc_mcontext.__gregs[8] = regs[8];
  72         uc.uc_mcontext.__gregs[9] = regs[9];
  73         uc.uc_mcontext.__gregs[10] = regs[10];
  74         uc.uc_mcontext.__gregs[11] = regs[11];
  75         uc.uc_mcontext.__gregs[12] = regs[12];
  76         uc.uc_mcontext.__gregs[13] = regs[13];
  77         uc.uc_mcontext.__gregs[14] = regs[14];
  78         uc.uc_mcontext.__gregs[15] = regs[15];
  79         uc.uc_mcontext.__gregs[16] = regs[16];
  80         uc.uc_mcontext.__gregs[17] = regs[17];
  81         uc.uc_mcontext.__gregs[18] = regs[18];
  82
  83         /* Preserve the current value of DP */
  84         uc.uc_mcontext.__gregs[27] = dp;
  85
  86         /* Set the desired return value. */
  87         uc.uc_mcontext.__gregs[_REG_RET0] = val;
  88
  89         /*
  90          * Set _UC_{SET,CLR}STACK according to SS_ONSTACK.
  91          *
  92          * Restore the signal mask with sigprocmask() instead of _UC_SIGMASK,
  93          * since libpthread may want to interpose on signal handling.
  94          */
  95         uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
  96
  97         sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
  98
  99         /* Clear uc_link */
 100         uc.uc_link = 0;
 101
 102         /* Copy signal mask */
 103         uc.uc_sigmask = sc->sc_mask;
 104
 105         /* Copy special regs */
 106         uc.uc_mcontext.__gregs[_REG_PSW] = sc->sc_ps;
 107         uc.uc_mcontext.__gregs[_REG_SP] = sc->sc_sp;
 108         uc.uc_mcontext.__gregs[_REG_PCSQH] = sc->sc_pcsqh;
 109         uc.uc_mcontext.__gregs[_REG_PCOQH] = sc->sc_pcoqh;
 110         uc.uc_mcontext.__gregs[_REG_PCSQT] = sc->sc_pcsqt;
 111         uc.uc_mcontext.__gregs[_REG_PCOQT] = sc->sc_pcoqt;
 112
 113         setcontext(&uc);
 114  err:
 115         longjmperror();
 116         abort();
 117         /* NOTREACHED */
 118 }