cerror.S revision 1.16 
1/*	$NetBSD: cerror.S,v 1.16 2025/05/07 03:02:56 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#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
56	.fnstart
57	.cfi_startproc
58#endif
59	push	{r4, lr}
60#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
61	.save	{r4, lr}
62	.cfi_def_cfa_offset 8
63	.cfi_offset 14, -4
64	.cfi_offset 4, -8
65#endif
66	movs	r4, r0
67	bl	PLT_SYM(_C_LABEL(__errno))
68	str	r4, [r0]
69	MOV_RETVAL_MINUS_1
70	pop	{r4, pc}
71#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
72	.cfi_endproc
73	.fnend
74#endif
75#else /* !_REENTRANT */
76#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
77	.fnstart
78	.cfi_startproc
79#endif
80#ifdef __PIC__
81	/* Setup the GOT */
82	ldr	r3, .Lgot
83	add	r3, r3, pc	/* pc = &.LPIC0 */
84	ldr	r1, .Lerrno
85.LPIC0:	ldr	r1, [r3, r1]
86#else
87	ldr	r1, .Lerrno
88#endif /* __PIC__ */
89	str	r0, [r1]
90	MOV_RETVAL_MINUS_1
91	RET
92#if defined(__ARM_EABI__) && defined(__UNWIND_TABLES__)
93	.cfi_endproc
94	.fnend
95#endif
96
97#ifdef __PIC__
98	.align	0
99.Lgot:
100	.word	_C_LABEL(_GLOBAL_OFFSET_TABLE_) - .LPIC0
101#endif /* __PIC__ */
102	.globl	_C_LABEL(errno)
103
104.Lerrno:
105	.word	PIC_SYM(_C_LABEL(errno), GOT)
106#endif /* _REENTRANT */
107END(CERROR)
108