sysdeps/s390/s390-64/__longjmp.c

   1 /* Copyright (C) 2001, 2005 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   register long int r2 __asm ("%r2") = val == 0 ? 1 : val;
  33 #ifdef PTR_DEMANGLE
  34   register uintptr_t r3 __asm ("%r3") = THREAD_GET_POINTER_GUARD ();
  35   register void *r1 __asm ("%r1") = (void *) env;
  36 #endif
  37   /* Restore registers and jump back.  */
  38   asm volatile ("ld   %%f7,104(%1)\n\t"
  39                 "ld   %%f5,96(%1)\n\t"
  40                 "ld   %%f3,88(%1)\n\t"
  41                 "ld   %%f1,80(%1)\n\t"
  42 #ifdef PTR_DEMANGLE
  43                 "lmg  %%r6,%%r13,0(%1)\n\t"
  44                 "lmg  %%r4,%%r5,64(%1)\n\t"
  45                 "xgr  %%r4,%2\n\t"
  46                 "xgr  %%r5,%2\n\t"
  47                 "lgr  %%r15,%%r5\n\t"
  48                 "br   %%r4"
  49 #else
  50                 "lmg  %%r6,%%r15,0(%1)\n\t"
  51                 "br   %%r14"
  52 #endif
  53                 : : "r" (r2),
  54 #ifdef PTR_DEMANGLE
  55                     "r" (r1), "r" (r3)
  56 #else
  57                     "a" (env)
  58 #endif
  59                 );
  60
  61   /* Avoid `volatile function does return' warnings.  */
  62   for (;;);
  63 }