sysdeps/m68k/__longjmp.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <setjmp.h>
  20 #include <stdlib.h>
  21
  22 /* Jump to the position specified by ENV, causing the
  23    setjmp call there to return VAL, or 1 if VAL is 0.  */
  24 void
  25 __longjmp (__jmp_buf env, int val)
  26 {
  27   /* This restores the FP and SP that setjmp's caller had,
  28      and puts the return address into A0 and VAL into D0. */
  29
  30 #if     defined(__HAVE_68881__) || defined(__HAVE_FPU__)
  31   /* Restore the floating-point registers.  */
  32   asm volatile("fmovem%.x %0, fp0-fp7" :
  33                /* No outputs.  */ : "g" (env[0].__fpregs[0]) :
  34                "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7");
  35 #endif
  36
  37   /* Put VAL in D0.  */
  38   asm volatile("move%.l %0, d0" : /* No outputs.  */ :
  39                "g" (val == 0 ? 1 : val) : "d0");
  40
  41   asm volatile(/* Restore the data and address registers.  */
  42                "movem%.l %0, d1-d7/a0-a7\n"
  43                /* Return to setjmp's caller.  */
  44 #ifdef __motorola__
  45                "jmp (a0)"
  46 #else
  47                "jmp a0@"
  48 #endif
  49                : /* No outputs.  */ : "g" (env[0].__dregs[0])
  50                /* We don't bother with the clobbers,
  51                   because this code always jumps out anyway.  */
  52                );
  53
  54   /* This call avoids `volatile function does return' warnings.  */
  55   abort ();
  56 }