sysdeps/unix/sysv/linux/s390/s390-64/sysdep.S

   1 /* Copyright (C) 2001-2018 Free Software Foundation, Inc.
   2    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   3    This file is part of the GNU C Library.
   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 <sysdep.h>
  20 #include <tls.h>
  21
  22
  23 /* The following code is only used in the shared library when we
  24    compile the reentrant version.  Otherwise each system call defines
  25    each own version.  */
  26
  27 /* The syscall stubs jump here when they detect an error.  */
  28
  29 #undef CALL_MCOUNT
  30 #define CALL_MCOUNT
  31
  32 .text
  33 ENTRY(__syscall_error)
  34 #ifndef PIC
  35 # if IS_IN (libc)
  36 #  define SYSCALL_ERROR_ERRNO __libc_errno
  37 # else
  38 #  define SYSCALL_ERROR_ERRNO errno
  39 # endif
  40         basr    %r1,0
  41 0:      lg      %r1,1f-0b(%r1)
  42         ear     %r3,%a0
  43         sllg    %r3,%r3,32
  44         ear     %r3,%a1
  45         lcr     %r2,%r2
  46         st      %r2,0(%r1,%r3)
  47         lghi    %r2,-1
  48         br      %r14
  49 1:      .quad   SYSCALL_ERROR_ERRNO@ntpoff
  50 #else
  51 # if RTLD_PRIVATE_ERRNO
  52         larl    %r1,rtld_errno
  53         lcr     %r2,%r2
  54         st      %r2,0(%r1)
  55         lghi    %r2,-1
  56         br      %r14
  57 # else
  58 #  if IS_IN (libc)
  59 #   define SYSCALL_ERROR_ERRNO __libc_errno
  60 #  else
  61 #   define SYSCALL_ERROR_ERRNO errno
  62 #  endif
  63         larl    %r1,_GLOBAL_OFFSET_TABLE_
  64         lg      %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1)
  65         ear     %r3,%a0
  66         sllg    %r3,%r3,32
  67         ear     %r3,%a1
  68         lcr     %r2,%r2
  69         st      %r2,0(%r1,%r3)
  70         lghi    %r2,-1
  71         br      %r14
  72 # endif
  73 #endif
  74
  75 END (__syscall_error)