lib/libc/arch/sparc64/gen/longjmp.c

   1 /*      $NetBSD: longjmp.c,v 1.1 2005/10/16 17:15:38 christos 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 #include <stdio.h>
  39
  40 #define __LIBC12_SOURCE__
  41 #include <setjmp.h>
  42 #include <compat/include/setjmp.h>
  43
  44 typedef struct {
  45         __greg_t        __glob[5];
  46 } __jmp_buf_regs_t;
  47
  48 void
  49 __longjmp14(jmp_buf env, int val)
  50 {
  51         struct sigcontext *sc = (void *)env;
  52         __jmp_buf_regs_t *r = (void *)&sc[1];
  53         ucontext_t uc;
  54
  55         /* Ensure non-zero SP */
  56         if (sc->sc_sp == 0)
  57                 goto err;
  58
  59         /*
  60          * Set _UC_CPU. No FPU data saved, so we can't restore
  61          * that. Set _UC_{SET,CLR}STACK according to SS_ONSTACK
  62          */
  63         memset(&uc, 0, sizeof(uc));
  64         uc.uc_flags = _UC_CPU | (sc->sc_onstack ? _UC_SETSTACK : _UC_CLRSTACK);
  65
  66         /*
  67          * Set the signal mask - this is a weak symbol, so don't use
  68          * _UC_SIGMASK in the mcontext, libpthread might override sigprocmask.
  69          */
  70         sigprocmask(SIG_SETMASK, &sc->sc_mask, NULL);
  71
  72         /* Fill other registers */
  73         uc.uc_mcontext.__gregs[_REG_CCR] = sc->sc_tstate;
  74         uc.uc_mcontext.__gregs[_REG_PC] = sc->sc_pc;
  75         uc.uc_mcontext.__gregs[_REG_nPC] = sc->sc_npc;
  76         uc.uc_mcontext.__gregs[_REG_G1] = sc->sc_g1;
  77         uc.uc_mcontext.__gregs[_REG_G2] = sc->sc_o0;
  78         uc.uc_mcontext.__gregs[_REG_G3] = r->__glob[0];
  79         uc.uc_mcontext.__gregs[_REG_G4] = r->__glob[1];
  80         uc.uc_mcontext.__gregs[_REG_G5] = r->__glob[2];
  81         uc.uc_mcontext.__gregs[_REG_G6] = r->__glob[3];
  82         uc.uc_mcontext.__gregs[_REG_G7] = r->__glob[4];
  83         uc.uc_mcontext.__gregs[_REG_O6] = sc->sc_sp;
  84
  85         /* Make return value non-zero */
  86         if (val == 0)
  87                 val = 1;
  88
  89         /* Save return value in context */
  90         uc.uc_mcontext.__gregs[_REG_O0] = val;
  91
  92         setcontext(&uc);
  93
  94  err:
  95         longjmperror();
  96         abort();
  97         /* NOTREACHED */
  98 }