1/* syscall error handlers
2   Copyright (C) 2011-2022 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
25ENTRY (__syscall_error)
26	mv t0, ra
27	/* Fall through to __syscall_set_errno.  */
28END (__syscall_error)
29
30/* Non-standard calling convention: argument in a0, return address in t0,
31   and clobber only t1.  */
32ENTRY (__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
501:	jr t0
51END (__syscall_set_errno)
52