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 #include <stap-probe.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 #ifdef PTR_DEMANGLE
  33   uintptr_t guard = THREAD_GET_POINTER_GUARD ();
  34 # ifdef CHECK_SP
  35   CHECK_SP (env, guard);
  36 # endif
  37 #elif defined CHECK_SP
  38   CHECK_SP (env, 0);
  39 #endif
  40   register int r2 __asm ("%r2") = val == 0 ? 1 : val;
  41 #ifdef PTR_DEMANGLE
  42   register uintptr_t r3 __asm ("%r3") = guard;
  43   register void *r1 __asm ("%r1") = (void *) env;
  44 #endif
  45   /* Restore registers and jump back.  */
  46   asm volatile (
  47                 /* longjmp probe expects longjmp first argument, second
  48                    argument and target address.  */
  49 #ifdef PTR_DEMANGLE
  50                 "lm   %%r4,%%r5,32(%1)\n\t"
  51                 "xr   %%r4,%2\n\t"
  52                 "xr   %%r5,%2\n\t"
  53                 LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r4)
  54 #else
  55                 LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r14)
  56 #endif
  57
  58                 /* restore fpregs  */
  59                 "ld   %%f6,48(%1)\n\t"
  60                 "ld   %%f4,40(%1)\n\t"
  61
  62                 /* restore gregs and return to jmp_buf target  */
  63 #ifdef PTR_DEMANGLE
  64                 "lm   %%r6,%%r13,0(%1)\n\t"
  65                 "lr   %%r15,%%r5\n\t"
  66                 LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r4)
  67                 "br   %%r4"
  68 #else
  69                 "lm   %%r6,%%r15,0(%1)\n\t"
  70                 LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r14)
  71                 "br   %%r14"
  72 #endif
  73                 : : "r" (r2),
  74 #ifdef PTR_DEMANGLE
  75                     "r" (r1), "r" (r3)
  76 #else
  77                     "a" (env)
  78 #endif
  79                 );
  80
  81   /* Avoid `volatile function does return' warnings.  */
  82   for (;;);
  83 }