sysdeps/m68k/__longjmp.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1997, 2009
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <setjmp.h>
  21 #include <stdlib.h>
  22
  23 /* Jump to the position specified by ENV, causing the
  24    setjmp call there to return VAL, or 1 if VAL is 0.  */
  25 void
  26 __longjmp (__jmp_buf env, int val)
  27 {
  28   /* This restores the FP and SP that setjmp's caller had,
  29      and puts the return address into A0 and VAL into D0. */
  30
  31 #ifdef CHECK_SP
  32   CHECK_SP (env[0].__sp);
  33 #endif
  34
  35 #if     defined(__HAVE_68881__) || defined(__HAVE_FPU__)
  36   /* Restore the floating-point registers.  */
  37   asm volatile("fmovem%.x %0, %/fp0-%/fp7" :
  38                /* No outputs.  */ : "g" (env[0].__fpregs[0]));
  39 #elif defined (__mcffpu__)
  40   asm volatile("fmovem %0, %/fp0-%/fp7" :
  41                /* No outputs.  */ : "m" (env[0].__fpregs[0]));
  42 #endif
  43
  44   /* Put VAL in D0.  */
  45   asm volatile("move%.l %0, %/d0" : /* No outputs.  */ :
  46                "g" (val == 0 ? 1 : val) : "d0");
  47
  48   asm volatile(/* Restore the data and address registers.  */
  49                "movem%.l %0, %/d1-%/d7/%/a0-%/a7\n"
  50                /* Return to setjmp's caller.  */
  51 #ifdef __motorola__
  52                "jmp (%/a0)"
  53 #else
  54                "jmp %/a0@"
  55 #endif
  56                : /* No outputs.  */ : "g" (env[0].__dregs[0])
  57                /* We don't bother with the clobbers,
  58                   because this code always jumps out anyway.  */
  59                );
  60
  61   /* Avoid `volatile function does return' warnings.  */
  62   for (;;);
  63 }