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/*
36 * i386 needs custom assembly to transform the return from syscalls
37 * into a proper stack for a function call out to cerror{,_nocancel}.
38 */
39
40LABEL(tramp_cerror)
41	mov		%esp, %edx
42	andl	$0xfffffff0, %esp
43	subl	$16, %esp
44	movl	%edx, 4(%esp)
45	movl	%eax, (%esp)
46	CALL_EXTERN(_cerror)
47	movl	4(%esp), %esp
48	ret
49
50LABEL(tramp_cerror_nocancel)
51	mov		%esp, %edx
52	andl	$0xfffffff0, %esp
53	subl	$16, %esp
54	movl	%edx, 4(%esp)
55	movl	%eax, (%esp)
56	CALL_EXTERN(_cerror_nocancel)
57	movl	4(%esp), %esp
58	ret
59
60LABEL(__sysenter_trap)
61	popl %edx
62	movl %esp, %ecx
63	sysenter
64
65	.globl _i386_get_ldt
66	ALIGN
67_i386_get_ldt:
68	movl    $6,%eax
69	MACHDEP_SYSCALL_TRAP
70	jnb		2f
71	jmp		tramp_cerror
722:	ret
73
74
75	.globl _i386_set_ldt
76	ALIGN
77_i386_set_ldt:
78	movl    $5,%eax
79	MACHDEP_SYSCALL_TRAP
80	jnb		2f
81	jmp		tramp_cerror
822:	ret
83
84#elif defined(__x86_64__)
85
86	.globl _i386_get_ldt
87	ALIGN
88_i386_get_ldt:
89	movl    $6,%eax
90	MACHDEP_SYSCALL_TRAP
91	jnb		2f
92	movq	%rax, %rdi
93	jmp		_cerror
942:	ret
95
96
97	.globl _i386_set_ldt
98	ALIGN
99_i386_set_ldt:
100	movl    $5,%eax
101	MACHDEP_SYSCALL_TRAP
102	jnb		2f
103	movq	%rax, %rdi
104	jmp		_cerror
1052:	ret
106
107#endif
108