Subversion Repositories HelenOS

Rev

Rev 2778 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1120 palkovsky 1
#
2071 jermar 2
# Copyright (c) 2001-2004 Jakub Jermar
1120 palkovsky 3
# All rights reserved.
4
#
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions
7
# are met:
8
#
9
# - Redistributions of source code must retain the above copyright
10
#   notice, this list of conditions and the following disclaimer.
11
# - Redistributions in binary form must reproduce the above copyright
12
#   notice, this list of conditions and the following disclaimer in the
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
15
#   derived from this software without specific prior written permission.
16
#
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
19
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#
28
 
2776 cejka 29
#include <kernel/arch/context_offset.h>
30
 
1120 palkovsky 31
.text
32
 
33
.global context_save
34
.global context_restore
35
 
36
 
37
## Save current CPU context
38
#
39
# Save CPU context to the context_t variable
40
# pointed by the 1st argument. Returns 1 in EAX.
41
#
42
context_save:
43
	movl 0(%esp),%eax	# the caller's return %eip
2482 jermar 44
	movl 4(%esp),%edx	# address of the context variable to save context to
1120 palkovsky 45
 
2778 jermar 46
		# save registers to the context structure
2776 cejka 47
	CONTEXT_SAVE_ARCH_CORE %edx %eax
1120 palkovsky 48
 
49
	# Save TLS
50
	movl %gs:0, %eax
2776 cejka 51
	movl %eax, OFFSET_TLS(%edx)     # tls -> ctx->tls
1120 palkovsky 52
 
53
	xorl %eax,%eax		# context_save returns 1
54
	incl %eax
55
	ret
56
 
57
 
58
## Restore saved CPU context
59
#
60
# Restore CPU context from context_t variable
61
# pointed by the 1st argument. Returns 0 in EAX.
62
#
63
context_restore:
2482 jermar 64
	movl 4(%esp),%eax	# address of the context variable to restore context from
1120 palkovsky 65
 
2778 jermar 66
		# restore registers from the context structure
2776 cejka 67
	CONTEXT_RESTORE_ARCH_CORE %eax %edx
68
 
1120 palkovsky 69
	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
1391 palkovsky 70
 
1120 palkovsky 71
	# Set thread local storage
2613 jermar 72
	pushl %edx
2776 cejka 73
	movl OFFSET_TLS(%eax), %edx   # Set arg1 to TLS addr
2613 jermar 74
	movl $1, %eax         # Syscall SYS_TLS_SET
1120 palkovsky 75
	int $0x30
2613 jermar 76
	popl %edx
1120 palkovsky 77
 
78
	xorl %eax,%eax		# context_restore returns 0
79
	ret