Subversion Repositories HelenOS

Rev

Rev 3222 | Rev 3833 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
162 decky 1
#
2071 jermar 2
# Copyright (c) 2005 Martin Decky
162 decky 3
# All rights reserved.
4
#
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions
7
# are met:
8
#
9
# - Redistributions of source code must retain the above copyright
10
#   notice, this list of conditions and the following disclaimer.
11
# - Redistributions in binary form must reproduce the above copyright
12
#   notice, this list of conditions and the following disclaimer in the
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
15
#   derived from this software without specific prior written permission.
16
#
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
19
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#
28
 
845 decky 29
#include <arch/asm/regname.h>
191 decky 30
 
162 decky 31
.text
32
 
1220 decky 33
.global userspace_asm
1004 decky 34
.global iret
1277 decky 35
.global iret_syscall
210 decky 36
.global memsetb
37
.global memcpy
1288 jermar 38
.global memcpy_from_uspace
39
.global memcpy_to_uspace
40
.global memcpy_from_uspace_failover_address
41
.global memcpy_to_uspace_failover_address
185 decky 42
 
1220 decky 43
userspace_asm:
44
 
45
	# r3 = uspace_uarg
46
	# r4 = stack
1267 decky 47
	# r5 = entry
48
 
49
	# disable interrupts
1220 decky 50
 
51
	mfmsr r31
52
	rlwinm r31, r31, 0, 17, 15
53
	mtmsr r31
54
 
55
	# set entry point
56
 
57
	mtsrr0 r5
58
 
59
	# set problem state, enable interrupts
60
 
1267 decky 61
	ori r31, r31, msr_pr
62
	ori r31, r31, msr_ee
1220 decky 63
	mtsrr1 r31
64
 
65
	# set stack
66
 
67
	mr sp, r4
3222 svoboda 68
 
3585 svoboda 69
	# %r6 is defined to hold pcb_ptr - set it to 0
3222 svoboda 70
 
3585 svoboda 71
	xor r6, r6, r6
1220 decky 72
 
73
	# jump to userspace
74
 
75
	rfi
76
 
1004 decky 77
iret:
1277 decky 78
 
79
	# disable interrupts
80
 
81
	mfmsr r31
82
	rlwinm r31, r31, 0, 17, 15
83
	mtmsr r31
84
 
1355 decky 85
	lwz r0, 8(sp)
86
	lwz r2, 12(sp)
87
	lwz r3, 16(sp)
88
	lwz r4, 20(sp)
89
	lwz r5, 24(sp)
90
	lwz r6, 28(sp)
91
	lwz r7, 32(sp)
92
	lwz r8, 36(sp)
93
	lwz r9, 40(sp)
94
	lwz r10, 44(sp)
95
	lwz r11, 48(sp)
96
	lwz r13, 52(sp)
97
	lwz r14, 56(sp)
98
	lwz r15, 60(sp)
99
	lwz r16, 64(sp)
100
	lwz r17, 68(sp)
101
	lwz r18, 72(sp)
102
	lwz r19, 76(sp)
103
	lwz r20, 80(sp)
104
	lwz r21, 84(sp)
105
	lwz r22, 88(sp)
106
	lwz r23, 92(sp)
107
	lwz r24, 96(sp)
108
	lwz r25, 100(sp)
109
	lwz r26, 104(sp)
110
	lwz r27, 108(sp)
111
	lwz r28, 112(sp)
112
	lwz r29, 116(sp)
113
	lwz r30, 120(sp)
114
	lwz r31, 124(sp)
1004 decky 115
 
1355 decky 116
	lwz r12, 128(sp)
1277 decky 117
	mtcr r12
118
 
1355 decky 119
	lwz r12, 132(sp)
1267 decky 120
	mtsrr0 r12
1004 decky 121
 
1355 decky 122
	lwz r12, 136(sp)
1267 decky 123
	mtsrr1 r12
124
 
1355 decky 125
	lwz r12, 140(sp)
1267 decky 126
	mtlr r12
127
 
1355 decky 128
	lwz r12, 144(sp)
1277 decky 129
	mtctr r12
130
 
1355 decky 131
	lwz r12, 148(sp)
1277 decky 132
	mtxer r12
133
 
1355 decky 134
	lwz r12, 152(sp)
135
	lwz sp, 156(sp)
1277 decky 136
 
137
	rfi
138
 
139
iret_syscall:
140
 
1384 decky 141
	# reset decrementer
142
 
143
	li r31, 1000
144
	mtdec r31
145
 
1277 decky 146
	# disable interrupts
147
 
148
	mfmsr r31
149
	rlwinm r31, r31, 0, 17, 15
150
	mtmsr r31
151
 
1355 decky 152
	lwz r0, 8(sp)
153
	lwz r2, 12(sp)
154
	lwz r4, 20(sp)
155
	lwz r5, 24(sp)
156
	lwz r6, 28(sp)
157
	lwz r7, 32(sp)
158
	lwz r8, 36(sp)
159
	lwz r9, 40(sp)
160
	lwz r10, 44(sp)
161
	lwz r11, 48(sp)
162
	lwz r13, 52(sp)
163
	lwz r14, 56(sp)
164
	lwz r15, 60(sp)
165
	lwz r16, 64(sp)
166
	lwz r17, 68(sp)
167
	lwz r18, 72(sp)
168
	lwz r19, 76(sp)
169
	lwz r20, 80(sp)
170
	lwz r21, 84(sp)
171
	lwz r22, 88(sp)
172
	lwz r23, 92(sp)
173
	lwz r24, 96(sp)
174
	lwz r25, 100(sp)
175
	lwz r26, 104(sp)
176
	lwz r27, 108(sp)
177
	lwz r28, 112(sp)
178
	lwz r29, 116(sp)
179
	lwz r30, 120(sp)
180
	lwz r31, 124(sp)
1277 decky 181
 
1355 decky 182
	lwz r12, 128(sp)
1267 decky 183
	mtcr r12
184
 
1355 decky 185
	lwz r12, 132(sp)
1277 decky 186
	mtsrr0 r12
187
 
1355 decky 188
	lwz r12, 136(sp)
1277 decky 189
	mtsrr1 r12
190
 
1355 decky 191
	lwz r12, 140(sp)
1277 decky 192
	mtlr r12
193
 
1355 decky 194
	lwz r12, 144(sp)
1267 decky 195
	mtctr r12
196
 
1355 decky 197
	lwz r12, 148(sp)
1267 decky 198
	mtxer r12
1277 decky 199
 
1355 decky 200
	lwz r12, 152(sp)
201
	lwz sp, 156(sp)
1267 decky 202
 
1004 decky 203
	rfi
204
 
210 decky 205
memsetb:
3200 svoboda 206
	b _memsetb
210 decky 207
 
208
memcpy:
1288 jermar 209
memcpy_from_uspace:
210
memcpy_to_uspace:
211
 
860 decky 212
	srwi. r7, r5, 3
213
	addi r6, r3, -4
214
	addi r4, r4, -4
215
	beq	2f
216
 
217
	andi. r0, r6, 3
218
	mtctr r7
219
	bne 5f
220
 
221
	1:
222
 
223
	lwz r7, 4(r4)
224
	lwzu r8, 8(r4)
225
	stw r7, 4(r6)
226
	stwu r8, 8(r6)
227
	bdnz 1b
228
 
229
	andi. r5, r5, 7
230
 
231
	2:
232
 
233
	cmplwi 0, r5, 4
234
	blt 3f
235
 
236
	lwzu r0, 4(r4)
237
	addi r5, r5, -4
238
	stwu r0, 4(r6)
239
 
240
	3:
241
 
242
	cmpwi 0, r5, 0
243
	beqlr
244
	mtctr r5
245
	addi r4, r4, 3
246
	addi r6, r6, 3
247
 
248
	4:
249
 
250
	lbzu r0, 1(r4)
251
	stbu r0, 1(r6)
252
	bdnz 4b
210 decky 253
	blr
860 decky 254
 
255
	5:
256
 
257
	subfic r0, r0, 4
258
	mtctr r0
259
 
260
	6:
261
 
262
	lbz r7, 4(r4)
263
	addi r4, r4, 1
264
	stb r7, 4(r6)
265
	addi r6, r6, 1
266
	bdnz 6b
267
	subf r5, r0, r5
268
	rlwinm. r7, r5, 32-3, 3, 31
269
	beq 2b
270
	mtctr r7
271
	b 1b
1288 jermar 272
 
273
memcpy_from_uspace_failover_address:
274
memcpy_to_uspace_failover_address:
3189 jermar 275
	# return zero, failure
276
	xor r3, r3, r3
277
	blr