sysdeps/s390/s390-32/__longjmp.c

   1 /* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   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 <errno.h>
  21 #include <sysdep.h>
  22 #include <setjmp.h>
  23 #include <bits/setjmp.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26
  27 /* Jump to the position specified by ENV, causing the
  28    setjmp call there to return VAL, or 1 if VAL is 0.  */
  29 void
  30 __longjmp (__jmp_buf env, int val)
  31 {
  32    /* Restore registers and jump back.  */
  33    asm volatile ("lr   %%r2,%0\n\t"       /* PUT val in grp 2.  */
  34                  "ld   %%f6,48(%1)\n\t"
  35                  "ld   %%f4,40(%1)\n\t"
  36                  "lm   %%r6,%%r15,0(%1)\n\t"
  37                  "br   %%r14"
  38                  : : "r" (val == 0 ? 1 : val),
  39                  "a" (env) : "2" );
  40
  41   /* Avoid `volatile function does return' warnings.  */
  42   for (;;);
  43 }