WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libc/arch/ia32/src/syscall.S


#
# Copyright (c) 2007 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
.text
 
/** Syscall wrapper - INT $0x30 version.
 *
 * Mind the order of arguments. First two arguments and the syscall number go to
 * scratch registers. An optimized version of this wrapper for fewer arguments
 * could benefit from this and not save unused registers on the stack.
 */
.global __syscall_int
__syscall_int:
	pushl %ebx
	pushl %esi
	pushl %edi
	pushl %ebp
	movl 20(%esp), %edx	# First argument.
	movl 24(%esp), %ecx	# Second argument.
	movl 28(%esp), %ebx	# Third argument.
	movl 32(%esp), %esi	# Fourth argument.
	movl 36(%esp), %edi	# Fifth argument.
	movl 40(%esp), %ebp	# Sixth argument.
	movl 44(%esp), %eax	# Syscall number.
	int $0x30
	popl %ebp
	popl %edi
	popl %esi
	popl %ebx
	ret
 
 
/** Syscall wrapper - SYSENTER version.
 *
 * This is an optimized version of syscall for four or less arguments.  Note
 * that EBP and EDI are used to remember user stack address and the return
 * address. The kernel part doesn't save DS, ES and FS so the handler restores
 * these to the selector immediately following CS (it must be the flat data
 * segment, otherwise the SYSENTER wouldn't work in the first place).
 */
.global __syscall_sysenter
	.type __syscall_sysenter, @function
 
__syscall_sysenter:
	pushl %ebx
	pushl %esi
	pushl %edi
	pushl %ebp
	mov %esp, %ebp
	lea ra, %edi
	movl 20(%esp), %edx	# First argument.
	movl 24(%esp), %ecx	# Second argument.
	movl 28(%esp), %ebx	# Third argument.
	movl 32(%esp), %esi	# Fourth argument.
	movl 44(%esp), %eax	# Syscall number.
	sysenter
ra:
	movw %cs, %cx
	addw $8, %cx
	movw %cx, %ds
	movw %cx, %es
	movw %cx, %fs
	popl %ebp
	popl %edi
	popl %esi
	popl %ebx
	ret
 
	.size __syscall_sysenter, . - __syscall_sysenter
 

Rev 3535	Rev 3563
1	#	1	#
2	# Copyright (c) 2007 Jakub Jermar	2	# Copyright (c) 2007 Jakub Jermar
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	.text	29	.text
30		30
31	/** Syscall wrapper - INT $0x30 version.	31	/** Syscall wrapper - INT $0x30 version.
32	*	32	*
33	* Mind the order of arguments. First two arguments and the syscall number go to	33	* Mind the order of arguments. First two arguments and the syscall number go to
34	* scratch registers. An optimized version of this wrapper for fewer arguments	34	* scratch registers. An optimized version of this wrapper for fewer arguments
35	* could benefit from this and not save unused registers on the stack.	35	* could benefit from this and not save unused registers on the stack.
36	*/	36	*/
37	.global __syscall_int	37	.global __syscall_int
38	__syscall_int:	38	__syscall_int:
39	pushl %ebx	39	pushl %ebx
40	pushl %esi	40	pushl %esi
41	pushl %edi	41	pushl %edi
42	pushl %ebp	42	pushl %ebp
43	movl 20(%esp), %edx # First argument.	43	movl 20(%esp), %edx # First argument.
44	movl 24(%esp), %ecx # Second argument.	44	movl 24(%esp), %ecx # Second argument.
45	movl 28(%esp), %ebx # Third argument.	45	movl 28(%esp), %ebx # Third argument.
46	movl 32(%esp), %esi # Fourth argument.	46	movl 32(%esp), %esi # Fourth argument.
47	movl 36(%esp), %edi # Fifth argument.	47	movl 36(%esp), %edi # Fifth argument.
48	movl 40(%esp), %ebp # Sixth argument.	48	movl 40(%esp), %ebp # Sixth argument.
49	movl 44(%esp), %eax # Syscall number.	49	movl 44(%esp), %eax # Syscall number.
50	int $0x30	50	int $0x30
51	popl %ebp	51	popl %ebp
52	popl %edi	52	popl %edi
53	popl %esi	53	popl %esi
54	popl %ebx	54	popl %ebx
55	ret	55	ret
56		56
57		57
58	/** Syscall wrapper - SYSENTER version.	58	/** Syscall wrapper - SYSENTER version.
59	*	59	*
60	* This is an optimized version of syscall for four or less arguments. Note	60	* This is an optimized version of syscall for four or less arguments. Note
61	* that EBP and EDI are used to remember user stack address and the return	61	* that EBP and EDI are used to remember user stack address and the return
62	* address. The kernel part doesn't save DS, ES and FS so the handler restores	62	* address. The kernel part doesn't save DS, ES and FS so the handler restores
63	* these to the selector immediately following CS (it must be the flat data	63	* these to the selector immediately following CS (it must be the flat data
64	* segment, otherwise the SYSENTER wouldn't work in the first place).	64	* segment, otherwise the SYSENTER wouldn't work in the first place).
65	*/	65	*/
66	.global __syscall_sysenter	66	.global __syscall_sysenter
-		67	.type __syscall_sysenter, @function
-		68
67	__syscall_sysenter:	69	__syscall_sysenter:
68	pushl %ebx	70	pushl %ebx
69	pushl %esi	71	pushl %esi
70	pushl %edi	72	pushl %edi
71	pushl %ebp	73	pushl %ebp
72	mov %esp, %ebp	74	mov %esp, %ebp
73	lea ra, %edi	75	lea ra, %edi
74	movl 20(%esp), %edx # First argument.	76	movl 20(%esp), %edx # First argument.
75	movl 24(%esp), %ecx # Second argument.	77	movl 24(%esp), %ecx # Second argument.
76	movl 28(%esp), %ebx # Third argument.	78	movl 28(%esp), %ebx # Third argument.
77	movl 32(%esp), %esi # Fourth argument.	79	movl 32(%esp), %esi # Fourth argument.
78	movl 44(%esp), %eax # Syscall number.	80	movl 44(%esp), %eax # Syscall number.
79	sysenter	81	sysenter
80	ra:	82	ra:
81	movw %cs, %cx	83	movw %cs, %cx
82	addw $8, %cx	84	addw $8, %cx
83	movw %cx, %ds	85	movw %cx, %ds
84	movw %cx, %es	86	movw %cx, %es
85	movw %cx, %fs	87	movw %cx, %fs
86	popl %ebp	88	popl %ebp
87	popl %edi	89	popl %edi
88	popl %esi	90	popl %esi
89	popl %ebx	91	popl %ebx
90	ret	92	ret
-		93
-		94	.size __syscall_sysenter, . - __syscall_sysenter
91		95

Subversion Repositories HelenOS

(root)/branches/dynload/uspace/lib/libc/arch/ia32/src/syscall.S – Rev 3535 → 3563