sysdeps/s390/s390-32/__longjmp.c

   1 /* Copyright (C) 2000-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sysdep.h>
  21 #include <setjmp.h>
  22 #include <bits/setjmp.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 /* Jump to the position specified by ENV, causing the
  27    setjmp call there to return VAL, or 1 if VAL is 0.  */
  28 void
  29 __longjmp (__jmp_buf env, int val)
  30 {
  31 #ifdef PTR_DEMANGLE
  32   uintptr_t guard = THREAD_GET_POINTER_GUARD ();
  33 # ifdef CHECK_SP
  34   CHECK_SP (env, guard);
  35 # endif
  36 #elif defined CHECK_SP
  37   CHECK_SP (env, 0);
  38 #endif
  39   register int r2 __asm ("%r2") = val == 0 ? 1 : val;
  40 #ifdef PTR_DEMANGLE
  41   register uintptr_t r3 __asm ("%r3") = guard;
  42   register void *r1 __asm ("%r1") = (void *) env;
  43 #endif
  44   /* Restore registers and jump back.  */
  45   asm volatile ("ld   %%f6,48(%1)\n\t"
  46                 "ld   %%f4,40(%1)\n\t"
  47 #ifdef PTR_DEMANGLE
  48                 "lm   %%r6,%%r13,0(%1)\n\t"
  49                 "lm   %%r4,%%r5,32(%1)\n\t"
  50                 "xr   %%r4,%2\n\t"
  51                 "xr   %%r5,%2\n\t"
  52                 "lr   %%r15,%%r5\n\t"
  53                 "br   %%r4"
  54 #else
  55                 "lm   %%r6,%%r15,0(%1)\n\t"
  56                 "br   %%r14"
  57 #endif
  58                 : : "r" (r2),
  59 #ifdef PTR_DEMANGLE
  60                     "r" (r1), "r" (r3)
  61 #else
  62                     "a" (env)
  63 #endif
  64                 );
  65
  66   /* Avoid `volatile function does return' warnings.  */
  67   for (;;);
  68 }