sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S

   1 /* Copyright (C) 2012-2019 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 <sysdep.h>
  19
  20 ENTRY(__makecontext_ret)
  21         /* Mark r14 as undefined in order to stop unwinding here!  */
  22         cfi_undefined (r14)
  23         basr  %r14,%r7
  24         ltr   %r8,%r8                   /* Check whether uc_link is 0.  */
  25         jz    1f
  26         lr    %r2,%r8
  27         br    %r9
  28 1:      lhi   %r2,0                     /* EXIT return value.  */
  29 #ifdef NO_HIDDEN
  30         /* If SHARED and NO_HIDDEN is defined, we need to setup got pointer
  31            as HIDDEN_JUMPTARGET expands to JUMPTARGET which expands to
  32            exit@PLT.  Otherwise HIDDEN_JUMPTARGET expands to __GI_exit if
  33            SHARED is defined and to exit if SHARED is not defined.  */
  34         SYSCALL_PIC_SETUP
  35 #endif
  36         basr    %r1,0
  37 2:
  38         al      %r1,3f-2b(%r1)
  39         basr    %r14,%r1                /* Call exit.  */
  40         j       .+2                     /* Trap if exit returns for some reason.  */
  41 3:
  42         .long   HIDDEN_JUMPTARGET (exit) - 2b
  43 END(__makecontext_ret)