WebSVN – HelenOS – Diff – /trunk/kernel/arch/ia32/src/context.s


#
# Copyright (c) 2001-2004 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
 
.global context_save_arch
.global context_restore_arch
 
 
## Save current CPU context
#
# Save CPU context to the context_t variable
# pointed by the 1st argument. Returns 1 in EAX.
#
context_save_arch:
	movl 0(%esp),%eax	# the caller's return %eip
	movl 4(%esp),%edx	# address of the kernel_context variable to save context to
 
	movl %esp,0(%edx)	# %esp -> ctx->sp
	movl %eax,4(%edx)	# %eip -> ctx->pc
	movl %ebx,8(%edx)	# %ebx -> ctx->ebx
	movl %esi,12(%edx)	# %esi -> ctx->esi
	movl %edi,16(%edx)	# %edi -> ctx->edi
	movl %ebp,20(%edx)	# %ebp -> ctx->ebp
 
	xorl %eax,%eax		# context_save returns 1
	incl %eax
	ret
 
 
## Restore saved CPU context
#
# Restore CPU context from context_t variable
# pointed by the 1st argument. Returns 0 in EAX.
#
context_restore_arch:
	movl 4(%esp),%eax	# address of the kernel_context variable to restore context from
	movl 0(%eax),%esp	# ctx->sp -> %esp
	movl 4(%eax),%edx	# ctx->pc -> %edx
	movl 8(%eax),%ebx	# ctx->ebx -> %ebx
	movl 12(%eax),%esi	# ctx->esi -> %esi
	movl 16(%eax),%edi	# ctx->edi -> %edi
	movl 20(%eax),%ebp	# ctx->ebp -> %ebp
 
	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
	xorl %eax,%eax		# context_restore returns 0
	ret
 
 
Generated by GNU Enscript 1.6.6.
 
 
 

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/context.s – Rev 1787 → 2071

Rev 1787		Rev 2071
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	.text	29	.text
30		30
31	.global context_save_arch	31	.global context_save_arch
32	.global context_restore_arch	32	.global context_restore_arch
33		33
34		34
35	## Save current CPU context	35	## Save current CPU context
36	#	36	#
37	# Save CPU context to the context_t variable	37	# Save CPU context to the context_t variable
38	# pointed by the 1st argument. Returns 1 in EAX.	38	# pointed by the 1st argument. Returns 1 in EAX.
39	#	39	#
40	context_save_arch:	40	context_save_arch:
41	movl 0(%esp),%eax # the caller's return %eip	41	movl 0(%esp),%eax # the caller's return %eip
42	movl 4(%esp),%edx # address of the kernel_context variable to save context to	42	movl 4(%esp),%edx # address of the kernel_context variable to save context to
43		43
44	movl %esp,0(%edx) # %esp -> ctx->sp	44	movl %esp,0(%edx) # %esp -> ctx->sp
45	movl %eax,4(%edx) # %eip -> ctx->pc	45	movl %eax,4(%edx) # %eip -> ctx->pc
46	movl %ebx,8(%edx) # %ebx -> ctx->ebx	46	movl %ebx,8(%edx) # %ebx -> ctx->ebx
47	movl %esi,12(%edx) # %esi -> ctx->esi	47	movl %esi,12(%edx) # %esi -> ctx->esi
48	movl %edi,16(%edx) # %edi -> ctx->edi	48	movl %edi,16(%edx) # %edi -> ctx->edi
49	movl %ebp,20(%edx) # %ebp -> ctx->ebp	49	movl %ebp,20(%edx) # %ebp -> ctx->ebp
50		50
51	xorl %eax,%eax # context_save returns 1	51	xorl %eax,%eax # context_save returns 1
52	incl %eax	52	incl %eax
53	ret	53	ret
54		54
55		55
56	## Restore saved CPU context	56	## Restore saved CPU context
57	#	57	#
58	# Restore CPU context from context_t variable	58	# Restore CPU context from context_t variable
59	# pointed by the 1st argument. Returns 0 in EAX.	59	# pointed by the 1st argument. Returns 0 in EAX.
60	#	60	#
61	context_restore_arch:	61	context_restore_arch:
62	movl 4(%esp),%eax # address of the kernel_context variable to restore context from	62	movl 4(%esp),%eax # address of the kernel_context variable to restore context from
63	movl 0(%eax),%esp # ctx->sp -> %esp	63	movl 0(%eax),%esp # ctx->sp -> %esp
64	movl 4(%eax),%edx # ctx->pc -> %edx	64	movl 4(%eax),%edx # ctx->pc -> %edx
65	movl 8(%eax),%ebx # ctx->ebx -> %ebx	65	movl 8(%eax),%ebx # ctx->ebx -> %ebx
66	movl 12(%eax),%esi # ctx->esi -> %esi	66	movl 12(%eax),%esi # ctx->esi -> %esi
67	movl 16(%eax),%edi # ctx->edi -> %edi	67	movl 16(%eax),%edi # ctx->edi -> %edi
68	movl 20(%eax),%ebp # ctx->ebp -> %ebp	68	movl 20(%eax),%ebp # ctx->ebp -> %ebp
69		69
70	movl %edx,0(%esp) # ctx->pc -> saver's return %eip	70	movl %edx,0(%esp) # ctx->pc -> saver's return %eip
71	xorl %eax,%eax # context_restore returns 0	71	xorl %eax,%eax # context_restore returns 0
72	ret	72	ret
73		73
74		74
75	Generated by GNU Enscript 1.6.6.	75	Generated by GNU Enscript 1.6.6.
76		76
77		77
78		78