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 | |
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) |
52 | |