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162 decky 1
#
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# 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
1004 decky 34
.global iret
1277 decky 35
.global iret_syscall
210 decky 36
.global memsetb
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.global memcpy
1288 jermar 38
.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 43
userspace_asm:
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	# r3 = uspace_uarg
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	# r4 = stack
1267 decky 47
	# r5 = entry
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	# disable interrupts
1220 decky 50
 
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	mfmsr r31
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	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
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	# set entry point
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	mtsrr0 r5
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	# set problem state, enable interrupts
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1267 decky 61
	ori r31, r31, msr_pr
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	ori r31, r31, msr_ee
1220 decky 63
	mtsrr1 r31
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	# set stack
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	mr sp, r4
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	# jump to userspace
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71
	rfi
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1004 decky 73
iret:
1277 decky 74
 
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	# disable interrupts
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	mfmsr r31
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	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
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1004 decky 81
	lwz r0, 0(sp)
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	lwz r2, 4(sp)
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	lwz r3, 8(sp)
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	lwz r4, 12(sp)
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	lwz r5, 16(sp)
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	lwz r6, 20(sp)
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	lwz r7, 24(sp)
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	lwz r8, 28(sp)
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	lwz r9, 32(sp)
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	lwz r10, 36(sp)
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	lwz r11, 40(sp)
1267 decky 92
	lwz r13, 44(sp)
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	lwz r14, 48(sp)
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	lwz r15, 52(sp)
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	lwz r16, 56(sp)
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	lwz r17, 60(sp)
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	lwz r18, 64(sp)
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	lwz r19, 68(sp)
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	lwz r20, 72(sp)
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	lwz r21, 76(sp)
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	lwz r22, 80(sp)
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	lwz r23, 84(sp)
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	lwz r24, 88(sp)
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	lwz r25, 92(sp)
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	lwz r26, 96(sp)
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	lwz r27, 100(sp)
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	lwz r28, 104(sp)
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	lwz r29, 108(sp)
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	lwz r30, 112(sp)
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	lwz r31, 116(sp)
1004 decky 111
 
1267 decky 112
	lwz r12, 120(sp)
1277 decky 113
	mtcr r12
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115
	lwz r12, 124(sp)
1267 decky 116
	mtsrr0 r12
1004 decky 117
 
1277 decky 118
	lwz r12, 128(sp)
1267 decky 119
	mtsrr1 r12
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1277 decky 121
	lwz r12, 132(sp)
1267 decky 122
	mtlr r12
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1277 decky 124
	lwz r12, 136(sp)
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	mtctr r12
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127
	lwz r12, 140(sp)
128
	mtxer r12
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130
	lwz r12, 144(sp)
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	lwz sp, 148(sp)
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133
	rfi
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135
iret_syscall:
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	# disable interrupts
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139
	mfmsr r31
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	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
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143
	lwz r0, 0(sp)
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	lwz r2, 4(sp)
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	lwz r4, 12(sp)
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	lwz r5, 16(sp)
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	lwz r6, 20(sp)
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	lwz r7, 24(sp)
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	lwz r8, 28(sp)
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	lwz r9, 32(sp)
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	lwz r10, 36(sp)
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	lwz r11, 40(sp)
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	lwz r13, 44(sp)
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	lwz r14, 48(sp)
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	lwz r15, 52(sp)
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	lwz r16, 56(sp)
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	lwz r17, 60(sp)
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	lwz r18, 64(sp)
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	lwz r19, 68(sp)
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	lwz r20, 72(sp)
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	lwz r21, 76(sp)
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	lwz r22, 80(sp)
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	lwz r23, 84(sp)
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	lwz r24, 88(sp)
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	lwz r25, 92(sp)
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	lwz r26, 96(sp)
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	lwz r27, 100(sp)
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	lwz r28, 104(sp)
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	lwz r29, 108(sp)
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	lwz r30, 112(sp)
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	lwz r31, 116(sp)
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173
	lwz r12, 120(sp)
1267 decky 174
	mtcr r12
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1277 decky 176
	lwz r12, 124(sp)
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	mtsrr0 r12
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179
	lwz r12, 128(sp)
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	mtsrr1 r12
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182
	lwz r12, 132(sp)
183
	mtlr r12
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1267 decky 185
	lwz r12, 136(sp)
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	mtctr r12
187
 
188
	lwz r12, 140(sp)
189
	mtxer r12
1277 decky 190
 
191
	lwz r12, 144(sp)
192
	lwz sp, 148(sp)
1267 decky 193
 
1004 decky 194
	rfi
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210 decky 196
memsetb:
197
	rlwimi r5, r5, 8, 16, 23
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	rlwimi r5, r5, 16, 0, 15
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200
	addi r14, r3, -4
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202
	cmplwi 0, r4, 4
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	blt 7f
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205
	stwu r5, 4(r14)
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	beqlr
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208
	andi. r15, r14, 3
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	add r4, r15, r4
210
	subf r14, r15, r14
211
	srwi r15, r4, 2
212
	mtctr r15
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214
	bdz 6f
215
 
216
	1:
217
		stwu r5, 4(r14)
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		bdnz 1b
219
 
220
	6:
221
 
222
	andi. r4, r4, 3
223
 
224
	7:
225
 
226
	cmpwi 0, r4, 0
227
	beqlr
228
 
229
	mtctr r4
230
	addi r6, r6, 3
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232
	8:
233
 
234
	stbu r5, 1(r14)
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	bdnz 8b
236
 
237
	blr
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239
memcpy:
1288 jermar 240
memcpy_from_uspace:
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memcpy_to_uspace:
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860 decky 243
	srwi. r7, r5, 3
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	addi r6, r3, -4
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	addi r4, r4, -4
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	beq	2f
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248
	andi. r0, r6, 3
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	mtctr r7
250
	bne 5f
251
 
252
	1:
253
 
254
	lwz r7, 4(r4)
255
	lwzu r8, 8(r4)
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	stw r7, 4(r6)
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	stwu r8, 8(r6)
258
	bdnz 1b
259
 
260
	andi. r5, r5, 7
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262
	2:
263
 
264
	cmplwi 0, r5, 4
265
	blt 3f
266
 
267
	lwzu r0, 4(r4)
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	addi r5, r5, -4
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	stwu r0, 4(r6)
270
 
271
	3:
272
 
273
	cmpwi 0, r5, 0
274
	beqlr
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	mtctr r5
276
	addi r4, r4, 3
277
	addi r6, r6, 3
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279
	4:
280
 
281
	lbzu r0, 1(r4)
282
	stbu r0, 1(r6)
283
	bdnz 4b
210 decky 284
	blr
860 decky 285
 
286
	5:
287
 
288
	subfic r0, r0, 4
289
	mtctr r0
290
 
291
	6:
292
 
293
	lbz r7, 4(r4)
294
	addi r4, r4, 1
295
	stb r7, 4(r6)
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	addi r6, r6, 1
297
	bdnz 6b
298
	subf r5, r0, r5
299
	rlwinm. r7, r5, 32-3, 3, 31
300
	beq 2b
301
	mtctr r7
302
	b 1b
1288 jermar 303
 
304
memcpy_from_uspace_failover_address:
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memcpy_to_uspace_failover_address:
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	b memcpy_from_uspace_failover_address