WebSVN – HelenOS – 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 context of this CPU
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 saved context on this CPU
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
 
 
.global fpu_context_save
fpu_context_save:
    ret
.global fpu_context_restore
fpu_context_restore:
    ret
 
.global fpu_lazy_context_save
fpu_lazy_context_save:
    mov 4(%esp),%eax;
    fxsave (%eax)
    xor %eax,%eax;
    ret;
.global fpu_lazy_context_restore
fpu_lazy_context_restore:
    mov 4(%esp),%eax;
    fxrstor (%eax)
    xor %eax,%eax;
    ret;
 
 

Rev 46	Rev 48
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	#	35	#
36	# save context of this CPU	36	# save context of this CPU
37	context_save:	37	context_save:
38	push %ebx	38	push %ebx
39		39
40	movl 4(%esp),%eax # the caller's return %eip	40	movl 4(%esp),%eax # the caller's return %eip
41	movl 8(%esp),%ebx # address of the kernel_context variable to save context to	41	movl 8(%esp),%ebx # address of the kernel_context variable to save context to
42	movl %eax,4(%ebx) # %eip -> ctx->pc	42	movl %eax,4(%ebx) # %eip -> ctx->pc
43	movl %esp,(%ebx) # %esp -> ctx->sp	43	movl %esp,(%ebx) # %esp -> ctx->sp
44		44
45	movl %ebx,%eax	45	movl %ebx,%eax
46	pop %ebx	46	pop %ebx
47		47
48	movl %ebx,8(%eax)	48	movl %ebx,8(%eax)
49	movl %ecx,12(%eax)	49	movl %ecx,12(%eax)
50	movl %edx,16(%eax)	50	movl %edx,16(%eax)
51	movl %esi,20(%eax)	51	movl %esi,20(%eax)
52	movl %edi,24(%eax)	52	movl %edi,24(%eax)
53	movl %ebp,28(%eax)	53	movl %ebp,28(%eax)
54		54
55	xorl %eax,%eax # context_save returns 1	55	xorl %eax,%eax # context_save returns 1
56	incl %eax	56	incl %eax
57	ret	57	ret
58		58
59	#	59	#
60	# restore saved context on this CPU	60	# restore saved context on this CPU
61	context_restore:	61	context_restore:
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 (%eax),%esp # ctx->sp -> %esp	63	movl (%eax),%esp # ctx->sp -> %esp
64	addl $4,%esp # this is for the pop we don't do	64	addl $4,%esp # this is for the pop we don't do
65		65
66	movl 8(%eax),%ebx	66	movl 8(%eax),%ebx
67	movl 12(%eax),%ecx	67	movl 12(%eax),%ecx
68	movl 16(%eax),%edx	68	movl 16(%eax),%edx
69	movl 20(%eax),%esi	69	movl 20(%eax),%esi
70	movl 24(%eax),%edi	70	movl 24(%eax),%edi
71	movl 28(%eax),%ebp	71	movl 28(%eax),%ebp
72		72
73	movl 4(%eax),%eax	73	movl 4(%eax),%eax
74	movl %eax,(%esp) # ctx->pc -> saver's return %eip	74	movl %eax,(%esp) # ctx->pc -> saver's return %eip
75	xorl %eax,%eax # context_restore returns 0	75	xorl %eax,%eax # context_restore returns 0
76	ret	76	ret
77		77
78		78
79	.global fpu_context_save	79	.global fpu_context_save
80	fpu_context_save:	80	fpu_context_save:
81	ret	81	ret
82	.global fpu_context_restore	82	.global fpu_context_restore
83	fpu_context_restore:	83	fpu_context_restore:
84	ret	84	ret
85		85
86	.global fpu_lazy_context_save	86	.global fpu_lazy_context_save
-		87	fpu_lazy_context_save:
87	mov 4(%esp),%eax;	88	mov 4(%esp),%eax;
88	fxsave (%eax)	89	fxsave (%eax)
89	xor %eax,%eax;	90	xor %eax,%eax;
90	ret;	91	ret;
91	.global fpu_lazy_context_restore	92	.global fpu_lazy_context_restore
-		93	fpu_lazy_context_restore:
92	mov 4(%esp),%eax;	94	mov 4(%esp),%eax;
93	fxrstor (%eax)	95	fxrstor (%eax)
94	xor %eax,%eax;	96	xor %eax,%eax;
95	ret;	97	ret;
96		98
97		99

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/context.s – Rev 46 → 48