[apple/xnu.git] / libsyscall / custom / custom.s

/*
 * Copyright (c) 1999-2015 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
 */

#include "SYS.h"

#if defined(__i386__)

/*
 * i386 needs custom assembly to transform the return from syscalls
 * into a proper stack for a function call out to cerror{,_nocancel}.
 */

LABEL(tramp_cerror)
	mov		%esp, %edx
	andl	$0xfffffff0, %esp
	subl	$16, %esp
	movl	%edx, 4(%esp)
	movl	%eax, (%esp)
	CALL_EXTERN(_cerror)
	movl	4(%esp), %esp
	ret

LABEL(tramp_cerror_nocancel)
	mov		%esp, %edx
	andl	$0xfffffff0, %esp
	subl	$16, %esp
	movl	%edx, 4(%esp)
	movl	%eax, (%esp)
	CALL_EXTERN(_cerror_nocancel)
	movl	4(%esp), %esp
	ret

LABEL(__sysenter_trap)
	popl %edx
	movl %esp, %ecx
	sysenter

	.globl _i386_get_ldt
	ALIGN
_i386_get_ldt:
	movl    $6,%eax
	MACHDEP_SYSCALL_TRAP
	jnb		2f
	jmp		tramp_cerror
2:	ret


	.globl _i386_set_ldt
	ALIGN
_i386_set_ldt:
	movl    $5,%eax
	MACHDEP_SYSCALL_TRAP
	jnb		2f
	jmp		tramp_cerror
2:	ret

	ALIGN
	.globl __thread_set_tsd_base
__thread_set_tsd_base:
	pushl   4(%esp)
	pushl   $0
	movl    $3,%eax
	MACHDEP_SYSCALL_TRAP
	addl    $8,%esp
	ret

#elif defined(__x86_64__)

	.globl _i386_get_ldt
	ALIGN
_i386_get_ldt:
	movl    $6,%eax
	MACHDEP_SYSCALL_TRAP
	jnb		2f
	movq	%rax, %rdi
	jmp		_cerror
2:	ret


	.globl _i386_set_ldt
	ALIGN
_i386_set_ldt:
	movl    $5,%eax
	MACHDEP_SYSCALL_TRAP
	jnb		2f
	movq	%rax, %rdi
	jmp		_cerror
2:	ret

	ALIGN
	.globl __thread_set_tsd_base
__thread_set_tsd_base:
	movl	$0, %esi	// 0 as the second argument
	movl    $ SYSCALL_CONSTRUCT_MDEP(3), %eax	// Machine-dependent syscall number 3
	MACHDEP_SYSCALL_TRAP
	ret

#else
#error unknown architecture
#endif

.subsections_via_symbols
Commit	Line	Data
2d21ac55	1	/*
39037602	2	* Copyright (c) 1999-2015 Apple Inc. All rights reserved.
2d21ac55 A	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
6d2010ae	33	#if defined(__i386__)
2d21ac55	34
39236c6e A	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
	40	LABEL(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
2d21ac55	49
39236c6e A	50	LABEL(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
2d21ac55 A	58	ret
2d21ac55 A	59
6d2010ae	60	LABEL(__sysenter_trap)
2d21ac55 A	61	popl %edx
	62	movl %esp, %ecx
	63	sysenter
	64
39236c6e A	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
	72	2: ret
2d21ac55	73
2d21ac55	74
39236c6e A	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
	82	2: ret
2d21ac55	83
39037602 A	84	ALIGN
	85	.globl __thread_set_tsd_base
	86	__thread_set_tsd_base:
	87	pushl 4(%esp)
	88	pushl $0
	89	movl $3,%eax
	90	MACHDEP_SYSCALL_TRAP
	91	addl $8,%esp
	92	ret
	93
39236c6e	94	#elif defined(__x86_64__)
2d21ac55 A	95
	96	.globl _i386_get_ldt
	97	ALIGN
	98	_i386_get_ldt:
	99	movl $6,%eax
	100	MACHDEP_SYSCALL_TRAP
39236c6e A	101	jnb 2f
	102	movq %rax, %rdi
	103	jmp _cerror
2d21ac55 A	104	2: ret
	105
	106
	107	.globl _i386_set_ldt
	108	ALIGN
	109	_i386_set_ldt:
	110	movl $5,%eax
	111	MACHDEP_SYSCALL_TRAP
39236c6e A	112	jnb 2f
	113	movq %rax, %rdi
	114	jmp _cerror
2d21ac55 A	115	2: ret
2d21ac55 A	116
39037602 A	117	ALIGN
	118	.globl __thread_set_tsd_base
	119	__thread_set_tsd_base:
	120	movl $0, %esi // 0 as the second argument
	121	movl $ SYSCALL_CONSTRUCT_MDEP(3), %eax // Machine-dependent syscall number 3
	122	MACHDEP_SYSCALL_TRAP
	123	ret
	124
	125	#else
	126	#error unknown architecture
2d21ac55	127	#endif
39037602 A	128
39037602 A	129	.subsections_via_symbols