sysdeps/unix/sysv/linux/loongarch/sysdep.S

   1 /* syscall error handlers
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20
  21 #if IS_IN (libc)
  22 # define errno __libc_errno
  23 #endif
  24
  25 ENTRY (__syscall_error)
  26 /* Fall through to __syscall_set_errno */
  27 END (__syscall_error)
  28
  29 /* Non-standard calling convention: argument in a0, return address in t0,
  30    and clobber only t1.
  31  */
  32 ENTRY (__syscall_set_errno)
  33
  34 /* We got here because a0 < 0, but only codes in the range [-4095, -1]
  35    represent errors.  Otherwise, just return the result normally.
  36  */
  37         li.d            t1, -4096
  38         bgeu            t1, a0, L (out)
  39         sub.w           a0, zero, a0
  40 #if RTLD_PRIVATE_ERRNO
  41         la              t1, rtld_errno
  42 #elif defined(__PIC__)
  43         la.tls.ie       t1, errno
  44         add.d           t1, tp, t1
  45 #else
  46         la.tls.le       t1, errno
  47         add.d           t1, tp, t1
  48 #endif
  49         st.w            a0, t1, 0
  50         li.d            a0, -1
  51 L (out):
  52         ret
  53 END (__syscall_set_errno)