path: root/arch/powerpc/kernel/exceptions-64s.S

/*
 * This file contains the 64-bit "server" PowerPC variant
 * of the low level exception handling including exception
 * vectors, exception return, part of the slb and stab
 * handling and other fixed offset specific things.
 *
 * This file is meant to be #included from head_64.S due to
 * position dependent assembly.
 *
 * Most of this originates from head_64.S and thus has the same
 * copyright history.
 *
 */

#include <asm/exception-64s.h>
#include <asm/ptrace.h>

/*
 * We layout physical memory as follows:
 * 0x0000 - 0x00ff : Secondary processor spin code
 * 0x0100 - 0x2fff : pSeries Interrupt prologs
 * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs
 * 0x6000 - 0x6fff : Initial (CPU0) segment table
 * 0x7000 - 0x7fff : FWNMI data area
 * 0x8000 -        : Early init and support code
 */

/*
 * This is the start of the interrupt handlers for pSeries
 * This code runs with relocation off.
 * Code from here to __end_interrupts gets copied down to real
 * address 0x100 when we are running a relocatable kernel.
 * Therefore any relative branches in this section must only
 * branch to labels in this section.
 */
	. = 0x100
	.globl __start_interrupts
__start_interrupts:

	STD_EXCEPTION_PSERIES(0x100, system_reset)

	. = 0x200
_machine_check_pSeries:
	HMT_MEDIUM
	DO_KVM	0x200
	mtspr	SPRN_SPRG_SCRATCH0,r13		/* save r13 */
	EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)

	. = 0x300
	.globl data_access_pSeries
data_access_pSeries:
	HMT_MEDIUM
	DO_KVM	0x300
	mtspr	SPRN_SPRG_SCRATCH0,r13
BEGIN_FTR_SECTION
	mfspr	r13,SPRN_SPRG_PACA
	std	r9,PACA_EXSLB+EX_R9(r13)
	std	r10,PACA_EXSLB+EX_R10(r13)
	mfspr	r10,SPRN_DAR
	mfspr	r9,SPRN_DSISR
	srdi	r10,r10,60
	rlwimi	r10,r9,16,0x20
	mfcr	r9
	cmpwi	r10,0x2c
	beq	do_stab_bolted_pSeries
	ld	r10,PACA_EXSLB+EX_R10(r13)
	std	r11,PACA_EXGEN+EX_R11(r13)
	ld	r11,PACA_EXSLB+EX_R9(r13)
	std	r12,PACA_EXGEN+EX_R12(r13)
	mfspr	r12,SPRN_SPRG_SCRATCH0
	std	r10,PACA_EXGEN+EX_R10(r13)
	std	r11,PACA_EXGEN+EX_R9(r13)
	std	r12,PACA_EXGEN+EX_R13(r13)
	EXCEPTION_PROLOG_PSERIES_1(data_access_common)
FTR_SECTION_ELSE
	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common)
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)

	. = 0x380
	.globl data_access_slb_pSeries
data_access_slb_pSeries:
	HMT_MEDIUM
	DO_KVM	0x380
	mtspr	SPRN_SPRG_SCRATCH0,r13
	mfspr	r13,SPRN_SPRG_PACA		/* get paca address into r13 */
	std	r3,PACA_EXSLB+EX_R3(r13)
	mfspr	r3,SPRN_DAR
	std	r9,PACA_EXSLB+EX_R9(r13)	/* save r9 - r12 */
	mfcr	r9
#ifdef __DISABLED__
	/* Keep that around for when we re-implement dynamic VSIDs */
	cmpdi	r3,0
	bge	slb_miss_user_pseries
#endif /* __DISABLED__ */
	std	r10,PACA_EXSLB+EX_R10(r13)
	std	r11,PACA_EXSLB+EX_R11(r13)
	std	r12,PACA_EXSLB+EX_R12(r13)
	mfspr	r10,SPRN_SPRG_SCRATCH0
	std	r10,PACA_EXSLB+EX_R13(r13)
	mfspr	r12,SPRN_SRR1		/* and SRR1 */
#ifndef CONFIG_RELOCATABLE
	b	.slb_miss_realmode
#else
	/*
	 * We can't just use a direct branch to .slb_miss_realmode
	 * because the distance from here to there depends on where
	 * the kernel ends up being put.
	 */
	mfctr	r11
	ld	r10,PACAKBASE(r13)
	LOAD_HANDLER(r10, .slb_miss_realmode)
	mtctr	r10
	bctr
#endif

	STD_EXCEPTION_PSERIES(0x400, instruction_access)

	. = 0x480
	.globl instruction_access_slb_pSeries
instruction_access_slb_pSeries:
	HMT_MEDIUM
	DO_KVM	0x480
	mtspr	SPRN_SPRG_SCRATCH0,r13
	mfspr	r13,SPRN_SPRG_PACA		/* get paca address into r13 */
	std	r3,PACA_EXSLB+EX_R3(r13)
	mfspr	r3,SPRN_SRR0		/* SRR0 is faulting address */
	std	r9,PACA_EXSLB+EX_R9(r13)	/* save r9 - r12 */
	mfcr	r9
#ifdef __DISABLED__
	/* Keep that around for when we re-implement dynamic VSIDs */
	cmpdi	r3,0
	bge	slb_miss_user_pseries
#endif /* __DISABLED__ */
	std	r10,PACA_EXSLB+EX_R10(r13)
	std	r11,PACA_EXSLB+EX_R11(r13)
	std	r12,PACA_EXSLB+EX_R12(r13)
	mfspr	r10,SPRN_SPRG_SCRATCH0
	std	r10,PACA_EXSLB+EX_R13(r13)
	mfspr	r12,SPRN_SRR1		/* and SRR1 */
#ifndef CONFIG_RELOCATABLE
	b	.slb_miss_realmode
#else
	mfctr	r11
	ld	r10,PACAKBASE(r13)
	LOAD_HANDLER(r10, .slb_miss_realmode)
	mtctr	r10
	bctr
#endif

	MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt)
	STD_EXCEPTION_PSERIES(0x600, alignment)
	STD_EXCEPTION_PSERIES(0x700, program_check)
	STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
	MASKABLE_EXCEPTION_PSERIES(0x900, decrementer)
	STD_EXCEPTION_PSERIES(0xa00, trap_0a)
	STD_EXCEPTION_PSERIES(0xb00, trap_0b)

	. = 0xc00
	.globl	system_call_pSeries
system_call_pSeries:
	HMT_MEDIUM
	DO_KVM	0xc00
BEGIN_FTR_SECTION
	cmpdi	r0,0x1ebe
	beq-	1f
END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
	mr	r9,r13
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