sysdeps/unix/arm/sysdep.S

   1 /* Copyright (C) 1991-2016 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 #define _ERRNO_H
  20 #include <bits/errno.h>
  21
  22 #if IS_IN (rtld)
  23 # include <dl-sysdep.h>                 /* Defines RTLD_PRIVATE_ERRNO.  */
  24 #endif
  25
  26 #include <tls.h>
  27
  28 #undef syscall_error
  29 __syscall_error:
  30 #if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
  31         /* We translate the system's EWOULDBLOCK error into EAGAIN.
  32            The GNU C library always defines EWOULDBLOCK==EAGAIN.
  33            EWOULDBLOCK_sys is the original number.  */
  34         cmp     r0, $EWOULDBLOCK_sys /* Is it the old EWOULDBLOCK?  */
  35         it      eq
  36         moveq   r0, $EAGAIN     /* Yes; translate it to EAGAIN.  */
  37 #endif
  38
  39 #if !IS_IN (rtld)
  40         mov     r1, r0
  41         GET_TLS (r2)
  42         ldr     r2, 1f
  43 #ifdef __thumb__
  44 2:      add     r2, r2, pc
  45         ldr     r2, [r2]
  46 #else
  47 2:      ldr     r2, [pc, r2]
  48 #endif
  49         str     r1, [r0, r2]
  50         mvn     r0, #0
  51         DO_RET(lr)
  52
  53 1:      .word errno(gottpoff) + (. - 2b - PC_OFS)
  54 #elif RTLD_PRIVATE_ERRNO
  55         LDST_PCREL(str, r0, r1, C_SYMBOL_NAME(rtld_errno))
  56         mvn     r0, #0
  57         DO_RET(r14)
  58 #else
  59 #error "Unsupported non-TLS case"
  60 #endif
  61
  62 #undef  __syscall_error
  63 END (__syscall_error)