WebSVN – HelenOS-historic – Diff – /SPARTAN/trunk/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
.global context_restore
 
 
## Save current CPU context
#
# Save CPU context to the kernel_context variable
# pointed by the 1st argument. Returns 1 in EAX.
#
context_save:
	push %ebx
 
	movl 4(%esp),%eax	# the caller's return %eip
	movl 8(%esp),%ebx	# address of the kernel_context variable to save context to
	movl %eax,4(%ebx)	# %eip -> ctx->pc
	movl %esp,(%ebx)	# %esp -> ctx->sp
 
	movl %ebx,%eax
	pop %ebx
 
	movl %ebx,8(%eax)
	movl %ecx,12(%eax)
	movl %edx,16(%eax)
	movl %esi,20(%eax)
	movl %edi,24(%eax)
	movl %ebp,28(%eax)
 
	xorl %eax,%eax		# context_save returns 1
	incl %eax
	ret
 
 
## Restore current CPU context
#
# Restore CPU context from the kernel_context variable
# pointed by the 1st argument. Returns 0 in EAX.
#
context_restore:
	movl 4(%esp),%eax	# address of the kernel_context variable to restore context from
	movl (%eax),%esp	# ctx->sp -> %esp
	addl $4,%esp		# this is for the pop we don't do
 
	movl 8(%eax),%ebx
	movl 12(%eax),%ecx
	movl 16(%eax),%edx
	movl 20(%eax),%esi
	movl 24(%eax),%edi
	movl 28(%eax),%ebp
 
	movl 4(%eax),%eax
	movl %eax,(%esp)	# ctx->pc -> saver's return %eip
	xorl %eax,%eax		# context_restore returns 0
	ret
 
 
Generated by GNU Enscript 1.6.6.
 
 
 

Rev 103	Rev 125
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	31	.global context_save
32	.global context_restore	32	.global context_restore
33		33
34		34
35	## Save current CPU context	35	## Save current CPU context
36	#	36	#
37	# Save CPU context to the kernel_context variable	37	# Save CPU context to the kernel_context 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:	40	context_save:
41	push %ebx	41	push %ebx
42		42
43	movl 4(%esp),%eax # the caller's return %eip	43	movl 4(%esp),%eax # the caller's return %eip
44	movl 8(%esp),%ebx # address of the kernel_context variable to save context to	44	movl 8(%esp),%ebx # address of the kernel_context variable to save context to
45	movl %eax,4(%ebx) # %eip -> ctx->pc	45	movl %eax,4(%ebx) # %eip -> ctx->pc
46	movl %esp,(%ebx) # %esp -> ctx->sp	46	movl %esp,(%ebx) # %esp -> ctx->sp
47		47
48	movl %ebx,%eax	48	movl %ebx,%eax
49	pop %ebx	49	pop %ebx
50		50
51	movl %ebx,8(%eax)	51	movl %ebx,8(%eax)
52	movl %ecx,12(%eax)	52	movl %ecx,12(%eax)
53	movl %edx,16(%eax)	53	movl %edx,16(%eax)
54	movl %esi,20(%eax)	54	movl %esi,20(%eax)
55	movl %edi,24(%eax)	55	movl %edi,24(%eax)
56	movl %ebp,28(%eax)	56	movl %ebp,28(%eax)
57		57
58	xorl %eax,%eax # context_save returns 1	58	xorl %eax,%eax # context_save returns 1
59	incl %eax	59	incl %eax
60	ret	60	ret
61		61
62		62
63	## Restore current CPU context	63	## Restore current CPU context
64	#	64	#
65	# Restore CPU context from the kernel_context variable	65	# Restore CPU context from the kernel_context variable
66	# pointed by the 1st argument. Returns 0 in EAX.	66	# pointed by the 1st argument. Returns 0 in EAX.
67	#	67	#
68	context_restore:	68	context_restore:
69	movl 4(%esp),%eax # address of the kernel_context variable to restore context from	69	movl 4(%esp),%eax # address of the kernel_context variable to restore context from
70	movl (%eax),%esp # ctx->sp -> %esp	70	movl (%eax),%esp # ctx->sp -> %esp
71	addl $4,%esp # this is for the pop we don't do	71	addl $4,%esp # this is for the pop we don't do
72		72
73	movl 8(%eax),%ebx	73	movl 8(%eax),%ebx
74	movl 12(%eax),%ecx	74	movl 12(%eax),%ecx
75	movl 16(%eax),%edx	75	movl 16(%eax),%edx
76	movl 20(%eax),%esi	76	movl 20(%eax),%esi
77	movl 24(%eax),%edi	77	movl 24(%eax),%edi
78	movl 28(%eax),%ebp	78	movl 28(%eax),%ebp
79		79
80	movl 4(%eax),%eax	80	movl 4(%eax),%eax
81	movl %eax,(%esp) # ctx->pc -> saver's return %eip	81	movl %eax,(%esp) # ctx->pc -> saver's return %eip
82	xorl %eax,%eax # context_restore returns 0	82	xorl %eax,%eax # context_restore returns 0
83	ret	83	ret
84		84
85		85
86	Generated by GNU Enscript 1.6.6.	86	Generated by GNU Enscript 1.6.6.
87		87
88		88
89		89

Subversion Repositories HelenOS-historic

(root)/SPARTAN/trunk/arch/ia32/src/context.s – Rev 103 → 125