Subversion Repositories HelenOS

Rev

Rev 2776 | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 2776 Rev 2778
1 
#
 1 
#
2 
# Copyright (c) 2001-2004 Jakub Jermar
 2 
# Copyright (c) 2001-2004 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 
#include <kernel/arch/context_offset.h>
 29 
#include <kernel/arch/context_offset.h>
30 
 
 30 
 
31 
.text
 31 
.text
32 
 
 32 
 
33 
.global context_save
 33 
.global context_save
34 
.global context_restore
 34 
.global context_restore
35 
 
 35 
 
36 
 
 36 
 
37 
## Save current CPU context
 37 
## Save current CPU context
38 
#
 38 
#
39 
# Save CPU context to the context_t variable
 39 
# Save CPU context to the context_t variable
40 
# pointed by the 1st argument. Returns 1 in EAX.
 40 
# pointed by the 1st argument. Returns 1 in EAX.
41 
#
 41 
#
42 
context_save:
 42 
context_save:
43 
	movl 0(%esp),%eax	# the caller's return %eip
 43 
	movl 0(%esp),%eax	# the caller's return %eip
44 
	movl 4(%esp),%edx	# address of the context variable to save context to
 44 
	movl 4(%esp),%edx	# address of the context variable to save context to
45 
 
 45 
 
46 
		# save registers to given structure
 46 
		# save registers to the context structure
47 
	CONTEXT_SAVE_ARCH_CORE %edx %eax
 47 
	CONTEXT_SAVE_ARCH_CORE %edx %eax
48 
 
 48 
 
49 
	# Save TLS
 49 
	# Save TLS
50 
	movl %gs:0, %eax
 50 
	movl %gs:0, %eax
51 
	movl %eax, OFFSET_TLS(%edx)     # tls -> ctx->tls
 51 
	movl %eax, OFFSET_TLS(%edx)     # tls -> ctx->tls
52
52
53 
	xorl %eax,%eax		# context_save returns 1
 53 
	xorl %eax,%eax		# context_save returns 1
54 
	incl %eax
 54 
	incl %eax
55 
	ret
 55 
	ret
56 
 
 56 
 
57 
 
 57 
 
58 
## Restore saved CPU context
 58 
## Restore saved CPU context
59 
#
 59 
#
60 
# Restore CPU context from context_t variable
 60 
# Restore CPU context from context_t variable
61 
# pointed by the 1st argument. Returns 0 in EAX.
 61 
# pointed by the 1st argument. Returns 0 in EAX.
62 
#
 62 
#
63 
context_restore:
 63 
context_restore:
64 
	movl 4(%esp),%eax	# address of the context variable to restore context from
 64 
	movl 4(%esp),%eax	# address of the context variable to restore context from
65 
 
 65 
 
66 
		# restore registers from jmp_buf
 66 
		# restore registers from the context structure
67 
	CONTEXT_RESTORE_ARCH_CORE %eax %edx
 67 
	CONTEXT_RESTORE_ARCH_CORE %eax %edx
68 
 
 68 
 
69 
	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
 69 
	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
70 
 
 70 
 
71 
	# Set thread local storage
 71 
	# Set thread local storage
72 
	pushl %edx
 72 
	pushl %edx
73 
	movl OFFSET_TLS(%eax), %edx   # Set arg1 to TLS addr
 73 
	movl OFFSET_TLS(%eax), %edx   # Set arg1 to TLS addr
74 
	movl $1, %eax         # Syscall SYS_TLS_SET
 74 
	movl $1, %eax         # Syscall SYS_TLS_SET
75 
	int $0x30
 75 
	int $0x30
76 
	popl %edx
 76 
	popl %edx
77
77
78 
	xorl %eax,%eax		# context_restore returns 0
 78 
	xorl %eax,%eax		# context_restore returns 0
79 
	ret
 79 
	ret
80 
 
 80