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987 decky 1
#
2071 jermar 2
# 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
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	# 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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		mfsprg2 sp
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		subis sp, sp, 0x8000
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	2:
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4055 trochtova 63
	subi sp, sp, 164
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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)
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	stw r12, 128(sp)
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	mfsrr0 r12
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	stw r12, 132(sp)
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	mfsrr1 r12
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	stw r12, 136(sp)
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	mflr r12
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	stw r12, 140(sp)
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	mfctr r12
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	stw r12, 144(sp)
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	mfxer r12
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	stw r12, 148(sp)
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	mfdar r12
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	stw r12, 152(sp)
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4055 trochtova 115
	mfsprg1 r12
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	stw r12, 156(sp)
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	mfsprg2 r12
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	stw r12, 160(sp)
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.endm
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.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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127
	li r3, 0
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	b jump_to_kernel
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.org 0x200
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.global exc_machine_check
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exc_machine_check:
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	CONTEXT_STORE
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	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
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	b data_storage
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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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4055 trochtova 150
	b instruction_storage
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.org 0x500
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.global exc_external
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exc_external:
1480 palkovsky 155
	CONTEXT_STORE
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157
	li r3, 4
1480 palkovsky 158
	b jump_to_kernel
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.org 0x600
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.global exc_alignment
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exc_alignment:
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	CONTEXT_STORE
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165
	li r3, 5
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	b jump_to_kernel
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.org 0x700
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.global exc_program
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exc_program:
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	CONTEXT_STORE
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173
	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
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	li r3, 8
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	b jump_to_kernel
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.org 0xa00
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.global exc_reserved0
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exc_reserved0:
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	CONTEXT_STORE
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	li r3, 9
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	b jump_to_kernel
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.org 0xb00
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.global exc_reserved1
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exc_reserved1:
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	CONTEXT_STORE
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	li r3, 10
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	b jump_to_kernel
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.org 0xc00
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.global exc_syscall
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exc_syscall:
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	CONTEXT_STORE
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	b jump_to_kernel_syscall
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.org 0xd00
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.global exc_trace
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exc_trace:
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	CONTEXT_STORE
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	li r3, 12
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	b jump_to_kernel
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4055 trochtova 223
.org 0x1000
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.global exc_itlb_miss
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exc_itlb_miss:
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	CONTEXT_STORE
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	b tlb_miss
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.org 0x1100
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.global exc_dtlb_miss_load
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exc_dtlb_miss_load:
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	CONTEXT_STORE
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235
	b tlb_miss
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237
.org 0x1200
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.global exc_dtlb_miss_store
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exc_dtlb_miss_store:
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	CONTEXT_STORE
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	b tlb_miss
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1716 decky 244
.org 0x4000
4055 trochtova 245
data_storage:
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	li r3, 2
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	mr r4, sp
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	addi r4, r4, 8
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	bl pht_refill_real
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251
	cmpwi r3, 0
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	bne iret_real
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254
	li r3, 2
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	b jump_to_kernel
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instruction_storage:
258
	li r3, 3
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	mr r4, sp
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	addi r4, r4, 8
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	bl pht_refill_real
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263
	cmpwi r3, 0
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	bne iret_real
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266
	li r3, 3
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	b jump_to_kernel
268
 
269
tlb_miss:
270
	li r3, 16
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	mfspr r4, tlbmiss
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	mfspr r5, ptehi
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	mfspr r6, ptelo
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	mr r7, sp
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	addi r7, r7, 20
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277
	bl tlb_refill_real
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	b iret_real
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jump_to_kernel:
281
	lis r12, iret@ha
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	addi r12, r12, iret@l
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	mtlr r12
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285
	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 289
	mfmsr r12
290
	ori r12, r12, (msr_ir | msr_dr)@l
291
	mtsrr1 r12
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293
	addis sp, sp, 0x8000
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	mr r4, sp
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	addi r4, r4, 8
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297
	rfi
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299
jump_to_kernel_syscall:
300
	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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304
	lis r12, iret_syscall@ha
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	addi r12, r12, iret_syscall@l
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	mtlr r12
1726 decky 307
 
1716 decky 308
	mfmsr r12
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	ori r12, r12, (msr_ir | msr_dr)@l
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	mtsrr1 r12
311
 
312
	addis sp, sp, 0x8000
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	rfi
1726 decky 314
 
315
iret_real:
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	lwz r0, 8(sp)
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	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)
321
	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)
328
	lwz r14, 56(sp)
329
	lwz r15, 60(sp)
330
	lwz r16, 64(sp)
331
	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)
336
	lwz r22, 88(sp)
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	lwz r23, 92(sp)
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	lwz r24, 96(sp)
339
	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)
343
	lwz r29, 116(sp)
344
	lwz r30, 120(sp)
345
	lwz r31, 124(sp)
346
 
347
	lwz r12, 128(sp)
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	mtcr r12
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350
	lwz r12, 132(sp)
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	mtsrr0 r12
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353
	lwz r12, 136(sp)
354
	mtsrr1 r12
355
 
356
	lwz r12, 140(sp)
357
	mtlr r12
358
 
359
	lwz r12, 144(sp)
360
	mtctr r12
361
 
362
	lwz r12, 148(sp)
363
	mtxer r12
364
 
4055 trochtova 365
	lwz r12, 156(sp)
366
	lwz sp, 160(sp)
1726 decky 367
 
368
	rfi