ports/sysdeps/m68k/__longjmp.c

   1 /* Copyright (C) 1991-2014 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <setjmp.h>
  19 #include <stdlib.h>
  20
  21 /* Jump to the position specified by ENV, causing the
  22    setjmp call there to return VAL, or 1 if VAL is 0.  */
  23 void
  24 __longjmp (__jmp_buf env, int val)
  25 {
  26   /* This restores the FP and SP that setjmp's caller had,
  27      and puts the return address into A0 and VAL into D0. */
  28
  29 #ifdef CHECK_SP
  30   CHECK_SP (env[0].__sp);
  31 #endif
  32
  33 #if     defined(__HAVE_68881__) || defined(__HAVE_FPU__)
  34   /* Restore the floating-point registers.  */
  35   asm volatile("fmovem%.x %0, %/fp0-%/fp7" :
  36                /* No outputs.  */ : "g" (env[0].__fpregs[0]));
  37 #elif defined (__mcffpu__)
  38   asm volatile("fmovem %0, %/fp0-%/fp7" :
  39                /* No outputs.  */ : "m" (env[0].__fpregs[0]));
  40 #endif
  41
  42   /* Put VAL in D0.  */
  43   asm volatile("move%.l %0, %/d0" : /* No outputs.  */ :
  44                "g" (val == 0 ? 1 : val) : "d0");
  45
  46   asm volatile(/* Restore the data and address registers.  */
  47                "movem%.l %0, %/d1-%/d7/%/a0-%/a7\n"
  48                /* Return to setjmp's caller.  */
  49 #ifdef __motorola__
  50                "jmp (%/a0)"
  51 #else
  52                "jmp %/a0@"
  53 #endif
  54                : /* No outputs.  */ : "g" (env[0].__dregs[0])
  55                /* We don't bother with the clobbers,
  56                   because this code always jumps out anyway.  */
  57                );
  58
  59   /* Avoid `volatile function does return' warnings.  */
  60   for (;;);
  61 }