1/* Copyright (C) 2001-2021 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   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#include <errno.h>
20#include <tls.h>
21
22#if IS_IN (rtld)
23# include <dl-sysdep.h>		/* Defines RTLD_PRIVATE_ERRNO.  */
24#endif
25
26.globl C_SYMBOL_NAME(errno)
27.globl syscall_error
28
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 $EWOULDBLOCK_sys, %RAX_LP /* Is it the old EWOULDBLOCK?  */
35	jne notb		/* Branch if not.  */
36	movl $EAGAIN, %eax	/* Yes; translate it to EAGAIN.  */
37notb:
38#endif
39#ifdef PIC
40	movq C_SYMBOL_NAME(errno@GOTTPOFF)(%rip), %rcx
41	movl %eax, %fs:0(%rcx)
42#else
43	movl %eax, %fs:C_SYMBOL_NAME(errno@TPOFF)
44#endif
45	or $-1, %RAX_LP
46	ret
47
48#undef	__syscall_error
49END (__syscall_error)
50