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987 decky 1
#
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# Copyright (C) 2006 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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#include <arch/asm/regname.h>
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#include <arch/mm/page.h>
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.section K_UNMAPPED_TEXT_START, "ax"
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.macro CONTEXT_STORE
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	# save R12 in SPRG1, backup CR in R12
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	# save SP in SPRG2
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	mtsprg1 r12
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	mfcr r12
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	mtsprg2 sp
1004 decky 42
 
1267 decky 43
	# check whether SP is in kernel
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	andis. sp, sp, 0x8000
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	bne 1f
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		# stack is in user-space
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		mfsprg0 sp
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	b 2f
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	1:
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		# stack is in kernel
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1277 decky 58
		mfsprg2 sp
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		subis sp, sp, 0x8000
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	2:
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1355 decky 63
	subi sp, sp, 160
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	stw r0, 8(sp)
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	stw r2, 12(sp)
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	stw r3, 16(sp)
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	stw r4, 20(sp)
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	stw r5, 24(sp)
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	stw r6, 28(sp)
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	stw r7, 32(sp)
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	stw r8, 36(sp)
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	stw r9, 40(sp)
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	stw r10, 44(sp)
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	stw r11, 48(sp)
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	stw r13, 52(sp)
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	stw r14, 56(sp)
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	stw r15, 60(sp)
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	stw r16, 64(sp)
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	stw r17, 68(sp)
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	stw r18, 72(sp)
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	stw r19, 76(sp)
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	stw r20, 80(sp)
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	stw r21, 84(sp)
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	stw r22, 88(sp)
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	stw r23, 92(sp)
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	stw r24, 96(sp)
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	stw r25, 100(sp)
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	stw r26, 104(sp)
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	stw r27, 108(sp)
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	stw r28, 112(sp)
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	stw r29, 116(sp)
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	stw r30, 120(sp)
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	stw r31, 124(sp)
1004 decky 94
 
1355 decky 95
	stw r12, 128(sp)
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1277 decky 97
	mfsrr0 r12
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	stw r12, 132(sp)
1004 decky 99
 
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	mfsrr1 r12
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	stw r12, 136(sp)
1004 decky 102
 
1277 decky 103
	mflr r12
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	stw r12, 140(sp)
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1277 decky 106
	mfctr r12
1355 decky 107
	stw r12, 144(sp)
1004 decky 108
 
1277 decky 109
	mfxer r12
1355 decky 110
	stw r12, 148(sp)
1277 decky 111
 
112
	mfsprg1 r12
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	stw r12, 152(sp)
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	mfsprg2 r12
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	stw r12, 156(sp)
1215 decky 117
.endm
1004 decky 118
 
1215 decky 119
.org 0x100
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.global exc_system_reset
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exc_system_reset:
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	CONTEXT_STORE
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124
	li r3, 0
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	b jump_to_kernel
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127
.org 0x200
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.global exc_machine_check
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exc_machine_check:
1609 decky 130
	CONTEXT_STORE
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132
	li r3, 1
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	b jump_to_kernel
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.org 0x300
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.global exc_data_storage
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exc_data_storage:
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	CONTEXT_STORE
1267 decky 139
 
1730 decky 140
	li r3, 2
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	mr r4, sp
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	addi r4, r4, 8
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	bl pht_real_refill
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1730 decky 145
	cmpwi r3, 0
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	bne iret_real
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1609 decky 148
	li r3, 2
1277 decky 149
	b jump_to_kernel
1215 decky 150
 
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.org 0x400
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.global exc_instruction_storage
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exc_instruction_storage:
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	CONTEXT_STORE
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1730 decky 156
	li r3, 3
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	mr r4, sp
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	addi r4, r4, 8
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	bl pht_real_refill
1267 decky 160
 
1730 decky 161
	cmpwi r3, 0
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	bne iret_real
1726 decky 163
 
1609 decky 164
	li r3, 3
1277 decky 165
	b jump_to_kernel
1215 decky 166
 
167
.org 0x500
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.global exc_external
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exc_external:
1480 palkovsky 170
	CONTEXT_STORE
1609 decky 171
 
172
	li r3, 4
1480 palkovsky 173
	b jump_to_kernel
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1215 decky 175
.org 0x600
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.global exc_alignment
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exc_alignment:
1609 decky 178
	CONTEXT_STORE
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180
	li r3, 5
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	b jump_to_kernel
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183
.org 0x700
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.global exc_program
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exc_program:
1609 decky 186
	CONTEXT_STORE
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188
	li r3, 6
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	b jump_to_kernel
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.org 0x800
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.global exc_fp_unavailable
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exc_fp_unavailable:
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	CONTEXT_STORE
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	li r3, 7
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	b jump_to_kernel
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.org 0x900
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.global exc_decrementer
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exc_decrementer:
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	CONTEXT_STORE
1004 decky 203
 
1609 decky 204
	li r3, 8
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	b jump_to_kernel
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207
.org 0xa00
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.global exc_reserved0
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exc_reserved0:
1609 decky 210
	CONTEXT_STORE
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212
	li r3, 9
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	b jump_to_kernel
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215
.org 0xb00
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.global exc_reserved1
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exc_reserved1:
1609 decky 218
	CONTEXT_STORE
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220
	li r3, 10
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	b jump_to_kernel
987 decky 222
 
223
.org 0xc00
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.global exc_syscall
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exc_syscall:
1277 decky 226
	CONTEXT_STORE	
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228
	b jump_to_kernel_syscall
987 decky 229
 
230
.org 0xd00
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.global exc_trace
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exc_trace:
1609 decky 233
	CONTEXT_STORE
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	li r3, 12
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	b jump_to_kernel
1716 decky 237
 
238
.org 0x4000
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jump_to_kernel:
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	lis r12, iret@ha
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	addi r12, r12, iret@l
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	mtlr r12
1726 decky 243
 
244
	lis r12, exc_dispatch@ha
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	addi r12, r12, exc_dispatch@l
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	mtsrr0 r12
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1716 decky 248
	mfmsr r12
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	ori r12, r12, (msr_ir | msr_dr)@l
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	mtsrr1 r12
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252
	addis sp, sp, 0x8000
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	mr r4, sp
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	addi r4, r4, 8
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256
	rfi
257
 
258
jump_to_kernel_syscall:
259
	lis r12, syscall_handler@ha
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	addi r12, r12, syscall_handler@l
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	mtsrr0 r12
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263
	lis r12, iret_syscall@ha
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	addi r12, r12, iret_syscall@l
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	mtlr r12
1726 decky 266
 
1716 decky 267
	mfmsr r12
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	ori r12, r12, (msr_ir | msr_dr)@l
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	mtsrr1 r12
270
 
271
	addis sp, sp, 0x8000
272
	rfi
1726 decky 273
 
274
iret_real:
275
 
276
	lwz r0, 8(sp)
277
	lwz r2, 12(sp)
278
	lwz r3, 16(sp)
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	lwz r4, 20(sp)
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	lwz r5, 24(sp)
281
	lwz r6, 28(sp)
282
	lwz r7, 32(sp)
283
	lwz r8, 36(sp)
284
	lwz r9, 40(sp)
285
	lwz r10, 44(sp)
286
	lwz r11, 48(sp)
287
	lwz r13, 52(sp)
288
	lwz r14, 56(sp)
289
	lwz r15, 60(sp)
290
	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)
299
	lwz r25, 100(sp)
300
	lwz r26, 104(sp)
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	lwz r27, 108(sp)
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	lwz r28, 112(sp)
303
	lwz r29, 116(sp)
304
	lwz r30, 120(sp)
305
	lwz r31, 124(sp)
306
 
307
	lwz r12, 128(sp)
308
	mtcr r12
309
 
310
	lwz r12, 132(sp)
311
	mtsrr0 r12
312
 
313
	lwz r12, 136(sp)
314
	mtsrr1 r12
315
 
316
	lwz r12, 140(sp)
317
	mtlr r12
318
 
319
	lwz r12, 144(sp)
320
	mtctr r12
321
 
322
	lwz r12, 148(sp)
323
	mtxer r12
324
 
325
	lwz r12, 152(sp)
326
	lwz sp, 156(sp)
327
 
328
	rfi