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

   1 /* syscall error handlers
   2    Copyright (C) 2011-2018 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    <http://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         mv t0, ra
  27         /* Fall through to __syscall_set_errno.  */
  28 END (__syscall_error)
  29
  30 /* Non-standard calling convention: argument in a0, return address in t0,
  31    and clobber only t1.  */
  32 ENTRY (__syscall_set_errno)
  33         /* We got here because a0 < 0, but only codes in the range [-4095, -1]
  34           represent errors.  Otherwise, just return the result normally.  */
  35         li t1, -4096
  36         bleu a0, t1, 1f
  37         neg a0, a0
  38 #if RTLD_PRIVATE_ERRNO
  39         sw a0, rtld_errno, t1
  40 #elif defined(__PIC__)
  41         la.tls.ie t1, errno
  42         add t1, t1, tp
  43         sw a0, 0(t1)
  44 #else
  45         lui t1, %tprel_hi(errno)
  46         add t1, t1, tp, %tprel_add(errno)
  47         sw a0, %tprel_lo(errno)(t1)
  48 #endif
  49         li a0, -1
  50 1:      jr t0
  51 END (__syscall_set_errno)