1/*
2 * Copyright (c) 1999-2011 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
29 */
30
31#include "SYS.h"
32
33#if defined(__i386__)
34
35	.globl	_errno
36
37LABEL(cerror)
38	movl	$0,%ecx
39	jmp		1f
40LABEL(cerror_nocancel)
41	movl	$1,%ecx
421:	REG_TO_EXTERN(%eax, _errno)
43	mov		%esp,%edx
44	andl	$0xfffffff0,%esp
45	subl	$16,%esp
46	movl	%edx,8(%esp)
47	movl	%ecx,4(%esp)
48	movl	%eax,(%esp)
49	CALL_EXTERN(_cthread_set_errno_self)
50	movl	8(%esp),%esp
51	movl	$-1,%eax
52	movl	$-1,%edx /* in case a 64-bit value is returned */
53	ret
54
55LABEL(__sysenter_trap)
56	popl %edx
57	movl %esp, %ecx
58	sysenter
59
60#elif defined(__x86_64__)
61
62	.globl	_errno
63
64LABEL(cerror)
65	/* cancelable syscall, for arg1 to _cthread_set_errno_self */
66	movq	$0,%rsi
67	jmp		1f
68LABEL(cerror_nocancel)
69	/* non-cancelable, see above. */
70	movq	$1,%rsi
711:	PICIFY(_errno) /* address -> %r11 */
72	movl	%eax,(%r11)
73	mov 	%rsp,%rdx
74	andq	$-16,%rsp
75	subq	$16,%rsp
76	// Preserve the original stack
77	movq	%rdx,(%rsp)
78	movq	%rax,%rdi
79	CALL_EXTERN(_cthread_set_errno_self)
80	// Restore the original stack
81	movq	(%rsp),%rsp
82	movq	$-1,%rax
83	movq	$-1,%rdx /* in case a 128-bit value is returned */
84	ret
85
86#elif defined(__arm__)
87
88	.globl	_errno
89
90MI_ENTRY_POINT(cerror)
91	stmfd	sp!, {r7, lr}
92	mov		r7, sp
93	MI_GET_ADDRESS(r3,_errno)
94	str		r0, [r3]
95	MI_CALL_EXTERNAL(_cthread_set_errno_self)
96	mov		r0, #-1
97	mov		r1, #-1
98	ldmfd	sp!, {r7, pc}
99
100#else
101#error Unsupported architecture
102#endif
103
104#if defined(__i386__) || defined(__x86_64__)
105
106	.globl _i386_get_ldt
107	ALIGN
108_i386_get_ldt:
109	movl    $6,%eax
110	MACHDEP_SYSCALL_TRAP
111	jnb	2f
112	jmp	cerror
1132:	ret
114
115
116	.globl _i386_set_ldt
117	ALIGN
118_i386_set_ldt:
119	movl    $5,%eax
120	MACHDEP_SYSCALL_TRAP
121	jnb	2f
122	jmp	cerror
1232:	ret
124
125#endif
126