WebSVN – HelenOS – Diff – /trunk/kernel/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>
 
/**
 * 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 %sp, [\r + OFFSET_SP]
	stx %o7, [\r + OFFSET_PC]
	stx %i0, [\r + OFFSET_I0]
	stx %i1, [\r + OFFSET_I1]
	stx %i2, [\r + OFFSET_I2]
	stx %i3, [\r + OFFSET_I3]
	stx %i4, [\r + OFFSET_I4]
	stx %i5, [\r + OFFSET_I5]
	stx %fp, [\r + OFFSET_FP]
	stx %i7, [\r + OFFSET_I7]
	stx %l0, [\r + OFFSET_L0]
	stx %l1, [\r + OFFSET_L1]
	stx %l2, [\r + OFFSET_L2]
	stx %l3, [\r + OFFSET_L3]
	stx %l4, [\r + OFFSET_L4]
	stx %l5, [\r + OFFSET_L5]
	stx %l6, [\r + OFFSET_L6]
	stx %l7, [\r + OFFSET_L7]
.endm
 
.macro CONTEXT_LOAD r
	ldx [\r + OFFSET_SP], %sp
	ldx [\r + OFFSET_PC], %o7
	ldx [\r + OFFSET_I0], %i0
	ldx [\r + OFFSET_I1], %i1
	ldx [\r + OFFSET_I2], %i2
	ldx [\r + OFFSET_I3], %i3
	ldx [\r + OFFSET_I4], %i4
	ldx [\r + OFFSET_I5], %i5
	ldx [\r + OFFSET_FP], %fp
	ldx [\r + OFFSET_I7], %i7
	ldx [\r + OFFSET_L0], %l0
	ldx [\r + OFFSET_L1], %l1
	ldx [\r + OFFSET_L2], %l2
	ldx [\r + OFFSET_L3], %l3
	ldx [\r + OFFSET_L4], %l4
	ldx [\r + OFFSET_L5], %l5
	ldx [\r + OFFSET_L6], %l6
	ldx [\r + OFFSET_L7], %l7
.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 1976	Rev 2071
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		30
31	/**	31	/**
32	* Both context_save_arch() and context_restore_arch() are	32	* Both context_save_arch() and context_restore_arch() are
33	* leaf-optimized procedures. This kind of optimization	33	* leaf-optimized procedures. This kind of optimization
34	* is very important and prevents any implicit window	34	* is very important and prevents any implicit window
35	* spill/fill/clean traps in these very core kernel	35	* spill/fill/clean traps in these very core kernel
36	* functions.	36	* functions.
37	*/	37	*/
38		38
39	.text	39	.text
40		40
41	.global context_save_arch	41	.global context_save_arch
42	.global context_restore_arch	42	.global context_restore_arch
43		43
44	.macro CONTEXT_STORE r	44	.macro CONTEXT_STORE r
45	stx %sp, [\r + OFFSET_SP]	45	stx %sp, [\r + OFFSET_SP]
46	stx %o7, [\r + OFFSET_PC]	46	stx %o7, [\r + OFFSET_PC]
47	stx %i0, [\r + OFFSET_I0]	47	stx %i0, [\r + OFFSET_I0]
48	stx %i1, [\r + OFFSET_I1]	48	stx %i1, [\r + OFFSET_I1]
49	stx %i2, [\r + OFFSET_I2]	49	stx %i2, [\r + OFFSET_I2]
50	stx %i3, [\r + OFFSET_I3]	50	stx %i3, [\r + OFFSET_I3]
51	stx %i4, [\r + OFFSET_I4]	51	stx %i4, [\r + OFFSET_I4]
52	stx %i5, [\r + OFFSET_I5]	52	stx %i5, [\r + OFFSET_I5]
53	stx %fp, [\r + OFFSET_FP]	53	stx %fp, [\r + OFFSET_FP]
54	stx %i7, [\r + OFFSET_I7]	54	stx %i7, [\r + OFFSET_I7]
55	stx %l0, [\r + OFFSET_L0]	55	stx %l0, [\r + OFFSET_L0]
56	stx %l1, [\r + OFFSET_L1]	56	stx %l1, [\r + OFFSET_L1]
57	stx %l2, [\r + OFFSET_L2]	57	stx %l2, [\r + OFFSET_L2]
58	stx %l3, [\r + OFFSET_L3]	58	stx %l3, [\r + OFFSET_L3]
59	stx %l4, [\r + OFFSET_L4]	59	stx %l4, [\r + OFFSET_L4]
60	stx %l5, [\r + OFFSET_L5]	60	stx %l5, [\r + OFFSET_L5]
61	stx %l6, [\r + OFFSET_L6]	61	stx %l6, [\r + OFFSET_L6]
62	stx %l7, [\r + OFFSET_L7]	62	stx %l7, [\r + OFFSET_L7]
63	.endm	63	.endm
64		64
65	.macro CONTEXT_LOAD r	65	.macro CONTEXT_LOAD r
66	ldx [\r + OFFSET_SP], %sp	66	ldx [\r + OFFSET_SP], %sp
67	ldx [\r + OFFSET_PC], %o7	67	ldx [\r + OFFSET_PC], %o7
68	ldx [\r + OFFSET_I0], %i0	68	ldx [\r + OFFSET_I0], %i0
69	ldx [\r + OFFSET_I1], %i1	69	ldx [\r + OFFSET_I1], %i1
70	ldx [\r + OFFSET_I2], %i2	70	ldx [\r + OFFSET_I2], %i2
71	ldx [\r + OFFSET_I3], %i3	71	ldx [\r + OFFSET_I3], %i3
72	ldx [\r + OFFSET_I4], %i4	72	ldx [\r + OFFSET_I4], %i4
73	ldx [\r + OFFSET_I5], %i5	73	ldx [\r + OFFSET_I5], %i5
74	ldx [\r + OFFSET_FP], %fp	74	ldx [\r + OFFSET_FP], %fp
75	ldx [\r + OFFSET_I7], %i7	75	ldx [\r + OFFSET_I7], %i7
76	ldx [\r + OFFSET_L0], %l0	76	ldx [\r + OFFSET_L0], %l0
77	ldx [\r + OFFSET_L1], %l1	77	ldx [\r + OFFSET_L1], %l1
78	ldx [\r + OFFSET_L2], %l2	78	ldx [\r + OFFSET_L2], %l2
79	ldx [\r + OFFSET_L3], %l3	79	ldx [\r + OFFSET_L3], %l3
80	ldx [\r + OFFSET_L4], %l4	80	ldx [\r + OFFSET_L4], %l4
81	ldx [\r + OFFSET_L5], %l5	81	ldx [\r + OFFSET_L5], %l5
82	ldx [\r + OFFSET_L6], %l6	82	ldx [\r + OFFSET_L6], %l6
83	ldx [\r + OFFSET_L7], %l7	83	ldx [\r + OFFSET_L7], %l7
84	.endm	84	.endm
85		85
86	context_save_arch:	86	context_save_arch:
87	CONTEXT_STORE %o0	87	CONTEXT_STORE %o0
88	retl	88	retl
89	mov 1, %o0 ! context_save_arch returns 1	89	mov 1, %o0 ! context_save_arch returns 1
90		90
91	context_restore_arch:	91	context_restore_arch:
92	#	92	#
93	# Flush all active windows.	93	# Flush all active windows.
94	# This is essential, because CONTEXT_LOAD overwrites	94	# This is essential, because CONTEXT_LOAD overwrites
95	# %sp of CWP - 1 with the value written to %fp of CWP.	95	# %sp of CWP - 1 with the value written to %fp of CWP.
96	# Flushing all active windows mitigates this problem	96	# Flushing all active windows mitigates this problem
97	# as CWP - 1 becomes the overlap window.	97	# as CWP - 1 becomes the overlap window.
98	#	98	#
99	flushw	99	flushw
100		100
101	CONTEXT_LOAD %o0	101	CONTEXT_LOAD %o0
102	retl	102	retl
103	xor %o0, %o0, %o0 ! context_restore_arch returns 0	103	xor %o0, %o0, %o0 ! context_restore_arch returns 0
104		104

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/sparc64/src/context.S – Rev 1976 → 2071