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

   1 /* Copyright (C) 2001-2021 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <tls.h>
  20
  21
  22 /* The following code is only used in the shared library when we
  23    compile the reentrant version.  Otherwise each system call defines
  24    each own version.  */
  25
  26 /* The syscall stubs jump here when they detect an error.  */
  27
  28 #undef CALL_MCOUNT
  29 #define CALL_MCOUNT
  30
  31 .text
  32 ENTRY(__syscall_error)
  33 #ifndef PIC
  34 # if IS_IN (libc)
  35 #  define SYSCALL_ERROR_ERRNO __libc_errno
  36 # else
  37 #  define SYSCALL_ERROR_ERRNO errno
  38 # endif
  39         basr    %r1,0
  40 0:      lg      %r1,1f-0b(%r1)
  41         ear     %r3,%a0
  42         sllg    %r3,%r3,32
  43         ear     %r3,%a1
  44         lcr     %r2,%r2
  45         st      %r2,0(%r1,%r3)
  46         lghi    %r2,-1
  47         br      %r14
  48 1:      .quad   SYSCALL_ERROR_ERRNO@ntpoff
  49 #else
  50 # if RTLD_PRIVATE_ERRNO
  51         larl    %r1,rtld_errno
  52         lcr     %r2,%r2
  53         st      %r2,0(%r1)
  54         lghi    %r2,-1
  55         br      %r14
  56 # else
  57 #  if IS_IN (libc)
  58 #   define SYSCALL_ERROR_ERRNO __libc_errno
  59 #  else
  60 #   define SYSCALL_ERROR_ERRNO errno
  61 #  endif
  62         larl    %r1,_GLOBAL_OFFSET_TABLE_
  63         lg      %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1)
  64         ear     %r3,%a0
  65         sllg    %r3,%r3,32
  66         ear     %r3,%a1
  67         lcr     %r2,%r2
  68         st      %r2,0(%r1,%r3)
  69         lghi    %r2,-1
  70         br      %r14
  71 # endif
  72 #endif
  73
  74 END (__syscall_error)