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162 decky 1
#
2071 jermar 2
# Copyright (c) 2005 Martin Decky
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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845 decky 29
#include <arch/asm/regname.h>
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162 decky 31
.text
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1220 decky 33
.global userspace_asm
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.global iret
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.global iret_syscall
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.global memsetb
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.global memsetw
210 decky 38
.global memcpy
1288 jermar 39
.global memcpy_from_uspace
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.global memcpy_to_uspace
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.global memcpy_from_uspace_failover_address
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.global memcpy_to_uspace_failover_address
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1220 decky 44
userspace_asm:
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	# r3 = uspace_uarg
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	# r4 = stack
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	# r5 = entry
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50
	# disable interrupts
1220 decky 51
 
52
	mfmsr r31
53
	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
55
 
56
	# set entry point
57
 
58
	mtsrr0 r5
59
 
60
	# set problem state, enable interrupts
61
 
1267 decky 62
	ori r31, r31, msr_pr
63
	ori r31, r31, msr_ee
1220 decky 64
	mtsrr1 r31
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66
	# set stack
67
 
68
	mr sp, r4
3222 svoboda 69
 
3585 svoboda 70
	# %r6 is defined to hold pcb_ptr - set it to 0
3222 svoboda 71
 
3585 svoboda 72
	xor r6, r6, r6
1220 decky 73
 
74
	# jump to userspace
75
 
76
	rfi
77
 
1004 decky 78
iret:
1277 decky 79
 
80
	# disable interrupts
81
 
82
	mfmsr r31
83
	rlwinm r31, r31, 0, 17, 15
84
	mtmsr r31
85
 
1355 decky 86
	lwz r0, 8(sp)
87
	lwz r2, 12(sp)
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	lwz r3, 16(sp)
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	lwz r4, 20(sp)
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	lwz r5, 24(sp)
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	lwz r6, 28(sp)
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	lwz r7, 32(sp)
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	lwz r8, 36(sp)
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	lwz r9, 40(sp)
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	lwz r10, 44(sp)
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	lwz r11, 48(sp)
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	lwz r13, 52(sp)
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	lwz r14, 56(sp)
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	lwz r15, 60(sp)
100
	lwz r16, 64(sp)
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	lwz r17, 68(sp)
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	lwz r18, 72(sp)
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	lwz r19, 76(sp)
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	lwz r20, 80(sp)
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	lwz r21, 84(sp)
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	lwz r22, 88(sp)
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	lwz r23, 92(sp)
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	lwz r24, 96(sp)
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	lwz r25, 100(sp)
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	lwz r26, 104(sp)
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	lwz r27, 108(sp)
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	lwz r28, 112(sp)
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	lwz r29, 116(sp)
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	lwz r30, 120(sp)
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	lwz r31, 124(sp)
1004 decky 116
 
1355 decky 117
	lwz r12, 128(sp)
1277 decky 118
	mtcr r12
119
 
1355 decky 120
	lwz r12, 132(sp)
1267 decky 121
	mtsrr0 r12
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1355 decky 123
	lwz r12, 136(sp)
1267 decky 124
	mtsrr1 r12
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1355 decky 126
	lwz r12, 140(sp)
1267 decky 127
	mtlr r12
128
 
1355 decky 129
	lwz r12, 144(sp)
1277 decky 130
	mtctr r12
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1355 decky 132
	lwz r12, 148(sp)
1277 decky 133
	mtxer r12
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3833 decky 135
	lwz r12, 156(sp)
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	lwz sp, 160(sp)
1277 decky 137
 
138
	rfi
139
 
140
iret_syscall:
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	# reset decrementer
143
 
144
	li r31, 1000
145
	mtdec r31
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1277 decky 147
	# disable interrupts
148
 
149
	mfmsr r31
150
	rlwinm r31, r31, 0, 17, 15
151
	mtmsr r31
152
 
1355 decky 153
	lwz r0, 8(sp)
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	lwz r2, 12(sp)
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	lwz r4, 20(sp)
156
	lwz r5, 24(sp)
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	lwz r6, 28(sp)
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	lwz r7, 32(sp)
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	lwz r8, 36(sp)
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	lwz r9, 40(sp)
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	lwz r10, 44(sp)
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	lwz r11, 48(sp)
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	lwz r13, 52(sp)
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	lwz r14, 56(sp)
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	lwz r15, 60(sp)
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	lwz r16, 64(sp)
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	lwz r17, 68(sp)
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	lwz r18, 72(sp)
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	lwz r19, 76(sp)
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	lwz r20, 80(sp)
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	lwz r21, 84(sp)
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	lwz r22, 88(sp)
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	lwz r23, 92(sp)
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	lwz r24, 96(sp)
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	lwz r25, 100(sp)
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	lwz r26, 104(sp)
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	lwz r27, 108(sp)
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	lwz r28, 112(sp)
179
	lwz r29, 116(sp)
180
	lwz r30, 120(sp)
181
	lwz r31, 124(sp)
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	lwz r12, 128(sp)
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	mtcr r12
185
 
1355 decky 186
	lwz r12, 132(sp)
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	mtsrr0 r12
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1355 decky 189
	lwz r12, 136(sp)
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	mtsrr1 r12
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1355 decky 192
	lwz r12, 140(sp)
1277 decky 193
	mtlr r12
194
 
1355 decky 195
	lwz r12, 144(sp)
1267 decky 196
	mtctr r12
197
 
1355 decky 198
	lwz r12, 148(sp)
1267 decky 199
	mtxer r12
1277 decky 200
 
3833 decky 201
	lwz r12, 156(sp)
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	lwz sp, 160(sp)
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1004 decky 204
	rfi
4220 decky 205
 
210 decky 206
memsetb:
3200 svoboda 207
	b _memsetb
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4220 decky 209
memsetw:
210
	b _memsetw
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210 decky 212
memcpy:
1288 jermar 213
memcpy_from_uspace:
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memcpy_to_uspace:
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860 decky 216
	srwi. r7, r5, 3
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	addi r6, r3, -4
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	addi r4, r4, -4
219
	beq	2f
220
 
221
	andi. r0, r6, 3
222
	mtctr r7
223
	bne 5f
224
 
225
	1:
226
 
227
	lwz r7, 4(r4)
228
	lwzu r8, 8(r4)
229
	stw r7, 4(r6)
230
	stwu r8, 8(r6)
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	bdnz 1b
232
 
233
	andi. r5, r5, 7
234
 
235
	2:
236
 
237
	cmplwi 0, r5, 4
238
	blt 3f
239
 
240
	lwzu r0, 4(r4)
241
	addi r5, r5, -4
242
	stwu r0, 4(r6)
243
 
244
	3:
245
 
246
	cmpwi 0, r5, 0
247
	beqlr
248
	mtctr r5
249
	addi r4, r4, 3
250
	addi r6, r6, 3
251
 
252
	4:
253
 
254
	lbzu r0, 1(r4)
255
	stbu r0, 1(r6)
256
	bdnz 4b
210 decky 257
	blr
860 decky 258
 
259
	5:
260
 
261
	subfic r0, r0, 4
262
	mtctr r0
263
 
264
	6:
265
 
266
	lbz r7, 4(r4)
267
	addi r4, r4, 1
268
	stb r7, 4(r6)
269
	addi r6, r6, 1
270
	bdnz 6b
271
	subf r5, r0, r5
272
	rlwinm. r7, r5, 32-3, 3, 31
273
	beq 2b
274
	mtctr r7
275
	b 1b
1288 jermar 276
 
277
memcpy_from_uspace_failover_address:
278
memcpy_to_uspace_failover_address:
3189 jermar 279
	# return zero, failure
280
	xor r3, r3, r3
281
	blr