cerror.S revision 1.18 
1/*	$NetBSD: cerror.S,v 1.18 2025/05/07 16:26:47 uwe Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	from: @(#)cerror.s	5.1 (Berkeley) 4/23/90
32 */
33
34#include "SYS.h"
35
36/* { r0, r1 } := -1LL */
37#ifdef __thumb__
38#define MOV_RETVAL_MINUS_1	  \
39	movs	r0, #0		; \
40	mvns	r0, r0		; \
41	movs	r1, r0
42
43#else // !__thumb__
44#define MOV_RETVAL_MINUS_1	  \
45	mvn	r0, #0		; \
46	mov	r1, r0
47#endif
48
49
50/*
51 * Set `errno` and return -1.  See SYS.h for syscall stubs that call this.
52 */
53ENTRY_NP(CERROR)
54#ifdef _REENTRANT
55	/* __errno() returns the address of a thread local variable */
56	.globl	_C_LABEL(__errno)
57#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
58	.fnstart
59	.cfi_startproc
60#endif
61	push	{r4, lr}
62#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
63	.save	{r4, lr}
64	.cfi_def_cfa_offset 8
65	.cfi_offset 14, -4
66	.cfi_offset 4, -8
67#endif
68	movs	r4, r0
69	bl	PLT_SYM(_C_LABEL(__errno))
70	str	r4, [r0]
71	MOV_RETVAL_MINUS_1
72	pop	{r4, pc}
73#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
74	.cfi_endproc
75	.fnend
76#endif
77
78#else /* !_REENTRANT */
79	/* errno is a global variable */
80	.globl	_C_LABEL(errno)
81#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
82	.fnstart
83	.cfi_startproc
84#endif
850:	GOT_INIT(r3, .Lgot)
86	ldr	r1, .Lerrno
87#ifdef __PIC__
88	ldr	r1, [r3, r1]
89#endif /* __PIC__ */
90	str	r0, [r1]
91	MOV_RETVAL_MINUS_1
92	RET
93#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
94	.cfi_endproc
95	.fnend
96#endif
97
98	GOT_INITSYM(.Lgot, 0b)
99.Lerrno:
100	.word	GOT_SYM(_C_LABEL(errno))
101#endif /* _REENTRANT */
102END(CERROR)
103