WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/sparc64/src/context.S


#
# Copyright (C) 2005 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.
#
 
#include <arch/context_offset.h>
#include <arch/stack.h>
 
/**
 * Both context_save_arch() and context_restore_arch() are
 * leaf-optimized procedures. This kind of optimization
 * is very important and prevents any implicit window
 * spill/fill/clean traps in these very core kernel
 * functions.
 */
	
.text   
 
.global context_save_arch
.global context_restore_arch
 
.macro CONTEXT_STORE r
	stx %o1, [\r + OFFSET_O1]
	stx %o2, [\r + OFFSET_O2]
	stx %o3, [\r + OFFSET_O3]
	stx %o4, [\r + OFFSET_O4]
	stx %o5, [\r + OFFSET_O5]
	stx %o7, [\r + OFFSET_PC]
	stx %sp, [\r + OFFSET_SP]
	stx %fp, [\r + OFFSET_FP]
	stx %i7, [\r + OFFSET_I7]
.endm
 
.macro CONTEXT_LOAD r
	ldx [\r + OFFSET_O1], %o1
	ldx [\r + OFFSET_O2], %o2
	ldx [\r + OFFSET_O3], %o3
	ldx [\r + OFFSET_O4], %o4
	ldx [\r + OFFSET_O5], %o5
	ldx [\r + OFFSET_PC], %o7
	ldx [\r + OFFSET_SP], %sp
	ldx [\r + OFFSET_FP], %fp
	ldx [\r + OFFSET_I7], %i7
.endm
 
context_save_arch:
	CONTEXT_STORE %o0
	retl
	mov 1, %o0		! context_save_arch returns 1
 
context_restore_arch:
	#
	# Flush all active windows.
	# This is essential, because CONTEXT_LOAD overwrites
	# %sp of CWP - 1 with the value written to %fp of CWP.
	# Flushing all active windows mitigates this problem
	# as CWP - 1 becomes the overlap window.
	#
	flushw
	
	CONTEXT_LOAD %o0
	retl
	xor %o0, %o0, %o0	! context_restore_arch returns 0
 

Rev 534	Rev 650
1	#	1	#
2	# Copyright (C) 2005 Jakub Jermar	2	# Copyright (C) 2005 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 <arch/context_offset.h>	29	#include <arch/context_offset.h>
30	#include <arch/stack.h>	30	#include <arch/stack.h>
31		31
32	/**	32	/**
33	* Both context_save_arch() and context_restore_arch() are	33	* Both context_save_arch() and context_restore_arch() are
34	* leaf-optimized procedures. This kind of optimization	34	* leaf-optimized procedures. This kind of optimization
35	* is very important and prevents any implicit window	35	* is very important and prevents any implicit window
36	* spill/fill/clean traps in these very core kernel	36	* spill/fill/clean traps in these very core kernel
37	* functions.	37	* functions.
38	*/	38	*/
39		39
40	.text	40	.text
41		41
42	.global context_save_arch	42	.global context_save_arch
43	.global context_restore_arch	43	.global context_restore_arch
44		44
45	.macro CONTEXT_STORE r	45	.macro CONTEXT_STORE r
46	stx %o1, [\r + OFFSET_O1]	46	stx %o1, [\r + OFFSET_O1]
47	stx %o2, [\r + OFFSET_O2]	47	stx %o2, [\r + OFFSET_O2]
48	stx %o3, [\r + OFFSET_O3]	48	stx %o3, [\r + OFFSET_O3]
49	stx %o4, [\r + OFFSET_O4]	49	stx %o4, [\r + OFFSET_O4]
50	stx %o5, [\r + OFFSET_O5]	50	stx %o5, [\r + OFFSET_O5]
51	stx %o7, [\r + OFFSET_PC]	51	stx %o7, [\r + OFFSET_PC]
52	stx %sp, [\r + OFFSET_SP]	52	stx %sp, [\r + OFFSET_SP]
53	stx %fp, [\r + OFFSET_FP]	53	stx %fp, [\r + OFFSET_FP]
-		54	stx %i7, [\r + OFFSET_I7]
54	.endm	55	.endm
55		56
56	.macro CONTEXT_LOAD r	57	.macro CONTEXT_LOAD r
57	ldx [\r + OFFSET_O1], %o1	58	ldx [\r + OFFSET_O1], %o1
58	ldx [\r + OFFSET_O2], %o2	59	ldx [\r + OFFSET_O2], %o2
59	ldx [\r + OFFSET_O3], %o3	60	ldx [\r + OFFSET_O3], %o3
60	ldx [\r + OFFSET_O4], %o4	61	ldx [\r + OFFSET_O4], %o4
61	ldx [\r + OFFSET_O5], %o5	62	ldx [\r + OFFSET_O5], %o5
62	ldx [\r + OFFSET_PC], %o7	63	ldx [\r + OFFSET_PC], %o7
63	ldx [\r + OFFSET_SP], %sp	64	ldx [\r + OFFSET_SP], %sp
64	ldx [\r + OFFSET_FP], %fp	65	ldx [\r + OFFSET_FP], %fp
-		66	ldx [\r + OFFSET_I7], %i7
65	.endm	67	.endm
66		68
67	context_save_arch:	69	context_save_arch:
68	CONTEXT_STORE %o0	70	CONTEXT_STORE %o0
69	retl	71	retl
70	mov 1, %o0 ! context_save_arch returns 1	72	mov 1, %o0 ! context_save_arch returns 1
71		73
72	context_restore_arch:	74	context_restore_arch:
73	#	75	#
74	# Flush all active windows.	76	# Flush all active windows.
75	# This is essential, because CONTEXT_LOAD overwrites	77	# This is essential, because CONTEXT_LOAD overwrites
76	# %sp of CWP - 1 with the value written to %fp of CWP.	78	# %sp of CWP - 1 with the value written to %fp of CWP.
77	# Flushing all active windows mitigates this problem	79	# Flushing all active windows mitigates this problem
78	# as CWP - 1 becomes the overlap window.	80	# as CWP - 1 becomes the overlap window.
79	#	81	#
80	flushw	82	flushw
81		83
82	CONTEXT_LOAD %o0	84	CONTEXT_LOAD %o0
83	retl	85	retl
84	xor %o0, %o0, %o0 ! context_restore_arch returns 0	86	xor %o0, %o0, %o0 ! context_restore_arch returns 0
85		87

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/sparc64/src/context.S – Rev 534 → 650