arch/powerpc/include/asm/exception-64s.h - kernel/msm-5.4 - Gitiles

 #ifndef _ASM_POWERPC_EXCEPTION_H
 #define _ASM_POWERPC_EXCEPTION_H
 /*
  * Extracted from head_64.S
  *
  *  PowerPC version
  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  *
  *  Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
  *    Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
  *  Adapted for Power Macintosh by Paul Mackerras.
  *  Low-level exception handlers and MMU support
  *  rewritten by Paul Mackerras.
  *    Copyright (C) 1996 Paul Mackerras.
  *
  *  Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
  *    Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
  *
  *  This file contains the low-level support and setup for the
  *  PowerPC-64 platform, including trap and interrupt dispatch.
  *
  *  This program is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU General Public License
  *  as published by the Free Software Foundation; either version
  *  2 of the License, or (at your option) any later version.
  */
 /*
  * The following macros define the code that appears as
  * the prologue to each of the exception handlers.  They
  * are split into two parts to allow a single kernel binary
  * to be used for pSeries and iSeries.
  *
  * We make as much of the exception code common between native
  * exception handlers (including pSeries LPAR) and iSeries LPAR
  * implementations as possible.
  */
 #include <asm/head-64.h>

 /* PACA save area offsets (exgen, exmc, etc) */
 #define EX_R9		0
 #define EX_R10		8
 #define EX_R11		16
 #define EX_R12		24
 #define EX_R13		32
 #define EX_DAR		40
 #define EX_DSISR	48
 #define EX_CCR		52
 #define EX_CFAR		56
 #define EX_PPR		64
 #if defined(CONFIG_RELOCATABLE)
 #define EX_CTR		72
 #define EX_SIZE		10	/* size in u64 units */
 #else
 #define EX_SIZE		9	/* size in u64 units */
 #endif

 /*
  * maximum recursive depth of MCE exceptions
  */
 #define MAX_MCE_DEPTH	4

 /*
  * EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
  * EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
  * in the save area so it's not necessary to overlap them. Could be used
  * for future savings though if another 4 byte register was to be saved.
  */
 #define EX_LR		EX_DAR

 /*
  * EX_R3 is only used by the bad_stack handler. bad_stack reloads and
  * saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
  * with EX_DAR.
  */
 #define EX_R3		EX_DAR

 #ifdef CONFIG_RELOCATABLE
 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\
 	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	LOAD_HANDLER(r12,label);					\
 	mtctr	r12;							\
 	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
 	li	r10,MSR_RI;						\
 	mtmsrd 	r10,1;			/* Set RI (EE=0) */		\
 	bctr;
 #else
 /* If not relocatable, we can jump directly -- and save messing with LR */
 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\
 	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
 	li	r10,MSR_RI;						\
 	mtmsrd 	r10,1;			/* Set RI (EE=0) */		\
 	b	label;
 #endif
 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\
 	__EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)			\

 /*
  * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
  * so no need to rfid.  Save lr in case we're CONFIG_RELOCATABLE, in which
  * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
  */
 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec)	\
 	EXCEPTION_PROLOG_0(area);					\
 	EXCEPTION_PROLOG_1(area, extra, vec);				\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)

 /*
  * We're short on space and time in the exception prolog, so we can't
  * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
  * Instead we get the base of the kernel from paca->kernelbase and or in the low
  * part of label. This requires that the label be within 64KB of kernelbase, and
  * that kernelbase be 64K aligned.
  */
 #define LOAD_HANDLER(reg, label)					\
 	ld	reg,PACAKBASE(r13);	/* get high part of &label */	\
 	ori	reg,reg,FIXED_SYMBOL_ABS_ADDR(label);

 #define __LOAD_HANDLER(reg, label)					\
 	ld	reg,PACAKBASE(r13);					\
 	ori	reg,reg,(ABS_ADDR(label))@l;

 /*
  * Branches from unrelocated code (e.g., interrupts) to labels outside
  * head-y require >64K offsets.
  */
 #define __LOAD_FAR_HANDLER(reg, label)					\
 	ld	reg,PACAKBASE(r13);					\
 	ori	reg,reg,(ABS_ADDR(label))@l;				\
 	addis	reg,reg,(ABS_ADDR(label))@h;

 /* Exception register prefixes */
 #define EXC_HV	H
 #define EXC_STD

 #if defined(CONFIG_RELOCATABLE)
 /*
  * If we support interrupts with relocation on AND we're a relocatable kernel,
  * we need to use CTR to get to the 2nd level handler.  So, save/restore it
  * when required.
  */
 #define SAVE_CTR(reg, area)	mfctr	reg ; 	std	reg,area+EX_CTR(r13)
 #define GET_CTR(reg, area) 			ld	reg,area+EX_CTR(r13)
 #define RESTORE_CTR(reg, area)	ld	reg,area+EX_CTR(r13) ; mtctr reg
 #else
 /* ...else CTR is unused and in register. */
 #define SAVE_CTR(reg, area)
 #define GET_CTR(reg, area) 	mfctr	reg
 #define RESTORE_CTR(reg, area)
 #endif

 /*
  * PPR save/restore macros used in exceptions_64s.S
  * Used for P7 or later processors
  */
 #define SAVE_PPR(area, ra, rb)						\
 BEGIN_FTR_SECTION_NESTED(940)						\
 	ld	ra,PACACURRENT(r13);					\
 	ld	rb,area+EX_PPR(r13);	/* Read PPR from paca */	\
 	std	rb,TASKTHREADPPR(ra);					\
 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)

 #define RESTORE_PPR_PACA(area, ra)					\
 BEGIN_FTR_SECTION_NESTED(941)						\
 	ld	ra,area+EX_PPR(r13);					\
 	mtspr	SPRN_PPR,ra;						\
 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)

 /*
  * Get an SPR into a register if the CPU has the given feature
  */
 #define OPT_GET_SPR(ra, spr, ftr)					\
 BEGIN_FTR_SECTION_NESTED(943)						\
 	mfspr	ra,spr;							\
 END_FTR_SECTION_NESTED(ftr,ftr,943)

 /*
  * Set an SPR from a register if the CPU has the given feature
  */
 #define OPT_SET_SPR(ra, spr, ftr)					\
 BEGIN_FTR_SECTION_NESTED(943)						\
 	mtspr	spr,ra;							\
 END_FTR_SECTION_NESTED(ftr,ftr,943)

 /*
  * Save a register to the PACA if the CPU has the given feature
  */
 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr)				\
 BEGIN_FTR_SECTION_NESTED(943)						\
 	std	ra,offset(r13);						\
 END_FTR_SECTION_NESTED(ftr,ftr,943)

 #define EXCEPTION_PROLOG_0(area)					\
 	GET_PACA(r13);							\
 	std	r9,area+EX_R9(r13);	/* save r9 */			\
 	OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);			\
 	HMT_MEDIUM;							\
 	std	r10,area+EX_R10(r13);	/* save r10 - r12 */		\
 	OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)

 #define __EXCEPTION_PROLOG_1(area, extra, vec)				\
 	OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR);		\
 	OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR);		\
 	SAVE_CTR(r10, area);						\
 	mfcr	r9;							\
 	extra(vec);							\
 	std	r11,area+EX_R11(r13);					\
 	std	r12,area+EX_R12(r13);					\
 	GET_SCRATCH0(r10);						\
 	std	r10,area+EX_R13(r13)
 #define EXCEPTION_PROLOG_1(area, extra, vec)				\
 	__EXCEPTION_PROLOG_1(area, extra, vec)

 #define __EXCEPTION_PROLOG_PSERIES_1(label, h)				\
 	ld	r10,PACAKMSR(r13);	/* get MSR value for kernel */	\
 	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	LOAD_HANDLER(r12,label)						\
 	mtspr	SPRN_##h##SRR0,r12;					\
 	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
 	mtspr	SPRN_##h##SRR1,r10;					\
 	h##rfid;							\
 	b	.	/* prevent speculative execution */
 #define EXCEPTION_PROLOG_PSERIES_1(label, h)				\
 	__EXCEPTION_PROLOG_PSERIES_1(label, h)

 /* _NORI variant keeps MSR_RI clear */
 #define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)			\
 	ld	r10,PACAKMSR(r13);	/* get MSR value for kernel */	\
 	xori	r10,r10,MSR_RI;		/* Clear MSR_RI */		\
 	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	LOAD_HANDLER(r12,label)						\
 	mtspr	SPRN_##h##SRR0,r12;					\
 	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
 	mtspr	SPRN_##h##SRR1,r10;					\
 	h##rfid;							\
 	b	.	/* prevent speculative execution */

 #define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)			\
 	__EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)

 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec)		\
 	EXCEPTION_PROLOG_0(area);					\
 	EXCEPTION_PROLOG_1(area, extra, vec);				\
 	EXCEPTION_PROLOG_PSERIES_1(label, h);

 #define __KVMTEST(h, n)							\
 	lbz	r10,HSTATE_IN_GUEST(r13);				\
 	cmpwi	r10,0;							\
 	bne	do_kvm_##h##n

 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 /*
  * If hv is possible, interrupts come into to the hv version
  * of the kvmppc_interrupt code, which then jumps to the PR handler,
  * kvmppc_interrupt_pr, if the guest is a PR guest.
  */
 #define kvmppc_interrupt kvmppc_interrupt_hv
 #else
 #define kvmppc_interrupt kvmppc_interrupt_pr
 #endif

 /*
  * Branch to label using its 0xC000 address. This results in instruction
  * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
  * on using mtmsr rather than rfid.
  *
  * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
  * load KBASE for a slight optimisation.
  */
 #define BRANCH_TO_C000(reg, label)					\
 	__LOAD_HANDLER(reg, label);					\
 	mtctr	reg;							\
 	bctr

 #ifdef CONFIG_RELOCATABLE
 #define BRANCH_TO_COMMON(reg, label)					\
 	__LOAD_HANDLER(reg, label);					\
 	mtctr	reg;							\
 	bctr

 #define BRANCH_LINK_TO_FAR(label)					\
 	__LOAD_FAR_HANDLER(r12, label);					\
 	mtctr	r12;							\
 	bctrl

 /*
  * KVM requires __LOAD_FAR_HANDLER.
  *
  * __BRANCH_TO_KVM_EXIT branches are also a special case because they
  * explicitly use r9 then reload it from PACA before branching. Hence
  * the double-underscore.
  */
 #define __BRANCH_TO_KVM_EXIT(area, label)				\
 	mfctr	r9;							\
 	std	r9,HSTATE_SCRATCH1(r13);				\
 	__LOAD_FAR_HANDLER(r9, label);					\
 	mtctr	r9;							\
 	ld	r9,area+EX_R9(r13);					\
 	bctr

 #else
 #define BRANCH_TO_COMMON(reg, label)					\
 	b	label

 #define BRANCH_LINK_TO_FAR(label)					\
 	bl	label

 #define __BRANCH_TO_KVM_EXIT(area, label)				\
 	ld	r9,area+EX_R9(r13);					\
 	b	label

 #endif

 /* Do not enable RI */
 #define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec)	\
 	EXCEPTION_PROLOG_0(area);					\
 	EXCEPTION_PROLOG_1(area, extra, vec);				\
 	EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);


 #define __KVM_HANDLER(area, h, n)					\
 	BEGIN_FTR_SECTION_NESTED(947)					\
 	ld	r10,area+EX_CFAR(r13);					\
 	std	r10,HSTATE_CFAR(r13);					\
 	END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947);		\
 	BEGIN_FTR_SECTION_NESTED(948)					\
 	ld	r10,area+EX_PPR(r13);					\
 	std	r10,HSTATE_PPR(r13);					\
 	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);	\
 	ld	r10,area+EX_R10(r13);					\
 	std	r12,HSTATE_SCRATCH0(r13);				\
 	sldi	r12,r9,32;						\
 	ori	r12,r12,(n);						\
 	/* This reloads r9 before branching to kvmppc_interrupt */	\
 	__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)

 #define __KVM_HANDLER_SKIP(area, h, n)					\
 	cmpwi	r10,KVM_GUEST_MODE_SKIP;				\
 	beq	89f;							\
 	BEGIN_FTR_SECTION_NESTED(948)					\
 	ld	r10,area+EX_PPR(r13);					\
 	std	r10,HSTATE_PPR(r13);					\
 	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948);	\
 	ld	r10,area+EX_R10(r13);					\
 	std	r12,HSTATE_SCRATCH0(r13);				\
 	sldi	r12,r9,32;						\
 	ori	r12,r12,(n);						\
 	/* This reloads r9 before branching to kvmppc_interrupt */	\
 	__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt);			\
 89:	mtocrf	0x80,r9;						\
 	ld	r9,area+EX_R9(r13);					\
 	ld	r10,area+EX_R10(r13);					\
 	b	kvmppc_skip_##h##interrupt

 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 #define KVMTEST(h, n)			__KVMTEST(h, n)
 #define KVM_HANDLER(area, h, n)		__KVM_HANDLER(area, h, n)
 #define KVM_HANDLER_SKIP(area, h, n)	__KVM_HANDLER_SKIP(area, h, n)

 #else
 #define KVMTEST(h, n)
 #define KVM_HANDLER(area, h, n)
 #define KVM_HANDLER_SKIP(area, h, n)
 #endif

 #define NOTEST(n)

 #define EXCEPTION_PROLOG_COMMON_1()					   \
 	std	r9,_CCR(r1);		/* save CR in stackframe	*/ \
 	std	r11,_NIP(r1);		/* save SRR0 in stackframe	*/ \
 	std	r12,_MSR(r1);		/* save SRR1 in stackframe	*/ \
 	std	r10,0(r1);		/* make stack chain pointer	*/ \
 	std	r0,GPR0(r1);		/* save r0 in stackframe	*/ \
 	std	r10,GPR1(r1);		/* save r1 in stackframe	*/ \


 /*
  * The common exception prolog is used for all except a few exceptions
  * such as a segment miss on a kernel address.  We have to be prepared
  * to take another exception from the point where we first touch the
  * kernel stack onwards.
  *
  * On entry r13 points to the paca, r9-r13 are saved in the paca,
  * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
  * SRR1, and relocation is on.
  */
 #define EXCEPTION_PROLOG_COMMON(n, area)				   \
 	andi.	r10,r12,MSR_PR;		/* See if coming from user	*/ \
 	mr	r10,r1;			/* Save r1			*/ \
 	subi	r1,r1,INT_FRAME_SIZE;	/* alloc frame on kernel stack	*/ \
 	beq-	1f;							   \
 	ld	r1,PACAKSAVE(r13);	/* kernel stack to use		*/ \
 1:	cmpdi	cr1,r1,-INT_FRAME_SIZE;	/* check if r1 is in userspace	*/ \
 	blt+	cr1,3f;			/* abort if it is		*/ \
 	li	r1,(n);			/* will be reloaded later	*/ \
 	sth	r1,PACA_TRAP_SAVE(r13);					   \
 	std	r3,area+EX_R3(r13);					   \
 	addi	r3,r13,area;		/* r3 -> where regs are saved*/	   \
 	RESTORE_CTR(r1, area);						   \
 	b	bad_stack;						   \
 3:	EXCEPTION_PROLOG_COMMON_1();					   \
 	beq	4f;			/* if from kernel mode		*/ \
 	ACCOUNT_CPU_USER_ENTRY(r13, r9, r10);				   \
 	SAVE_PPR(area, r9, r10);					   \
 4:	EXCEPTION_PROLOG_COMMON_2(area)					   \
 	EXCEPTION_PROLOG_COMMON_3(n)					   \
 	ACCOUNT_STOLEN_TIME

 /* Save original regs values from save area to stack frame. */
 #define EXCEPTION_PROLOG_COMMON_2(area)					   \
 	ld	r9,area+EX_R9(r13);	/* move r9, r10 to stackframe	*/ \
 	ld	r10,area+EX_R10(r13);					   \
 	std	r9,GPR9(r1);						   \
 	std	r10,GPR10(r1);						   \
 	ld	r9,area+EX_R11(r13);	/* move r11 - r13 to stackframe	*/ \
 	ld	r10,area+EX_R12(r13);					   \
 	ld	r11,area+EX_R13(r13);					   \
 	std	r9,GPR11(r1);						   \
 	std	r10,GPR12(r1);						   \
 	std	r11,GPR13(r1);						   \
 	BEGIN_FTR_SECTION_NESTED(66);					   \
 	ld	r10,area+EX_CFAR(r13);					   \
 	std	r10,ORIG_GPR3(r1);					   \
 	END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66);		   \
 	GET_CTR(r10, area);						   \
 	std	r10,_CTR(r1);

 #define EXCEPTION_PROLOG_COMMON_3(n)					   \
 	std	r2,GPR2(r1);		/* save r2 in stackframe	*/ \
 	SAVE_4GPRS(3, r1);		/* save r3 - r6 in stackframe   */ \
 	SAVE_2GPRS(7, r1);		/* save r7, r8 in stackframe	*/ \
 	mflr	r9;			/* Get LR, later save to stack	*/ \
 	ld	r2,PACATOC(r13);	/* get kernel TOC into r2	*/ \
 	std	r9,_LINK(r1);						   \
 	lbz	r10,PACASOFTIRQEN(r13);				   \
 	mfspr	r11,SPRN_XER;		/* save XER in stackframe	*/ \
 	std	r10,SOFTE(r1);						   \
 	std	r11,_XER(r1);						   \
 	li	r9,(n)+1;						   \
 	std	r9,_TRAP(r1);		/* set trap number		*/ \
 	li	r10,0;							   \
 	ld	r11,exception_marker@toc(r2);				   \
 	std	r10,RESULT(r1);		/* clear regs->result		*/ \
 	std	r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame	*/

 /*
  * Exception vectors.
  */
 #define STD_EXCEPTION_PSERIES(vec, label)			\
 	SET_SCRATCH0(r13);		/* save r13 */		\
 	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,		\
 				 EXC_STD, KVMTEST_PR, vec);	\

 /* Version of above for when we have to branch out-of-line */
 #define __OOL_EXCEPTION(vec, label, hdlr)			\
 	SET_SCRATCH0(r13)					\
 	EXCEPTION_PROLOG_0(PACA_EXGEN)				\
 	b hdlr;

 #define STD_EXCEPTION_PSERIES_OOL(vec, label)			\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec);	\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)

 #define STD_EXCEPTION_HV(loc, vec, label)			\
 	SET_SCRATCH0(r13);	/* save r13 */			\
 	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label,		\
 				 EXC_HV, KVMTEST_HV, vec);

 #define STD_EXCEPTION_HV_OOL(vec, label)			\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);	\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)

 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label)	\
 	/* No guest interrupts come through here */	\
 	SET_SCRATCH0(r13);		/* save r13 */	\
 	EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);

 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label)		\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec);		\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)

 #define STD_RELON_EXCEPTION_HV(loc, vec, label)		\
 	SET_SCRATCH0(r13);	/* save r13 */		\
 	EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label,	\
 				       EXC_HV, KVMTEST_HV, vec);

 #define STD_RELON_EXCEPTION_HV_OOL(vec, label)			\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec);	\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)

 /* This associate vector numbers with bits in paca->irq_happened */
 #define SOFTEN_VALUE_0x500	PACA_IRQ_EE
 #define SOFTEN_VALUE_0x900	PACA_IRQ_DEC
 #define SOFTEN_VALUE_0x980	PACA_IRQ_DEC
 #define SOFTEN_VALUE_0xa00	PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe80	PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe60	PACA_IRQ_HMI
 #define SOFTEN_VALUE_0xea0	PACA_IRQ_EE

 #define __SOFTEN_TEST(h, vec)						\
 	lbz	r10,PACASOFTIRQEN(r13);					\
 	cmpwi	r10,0;							\
 	li	r10,SOFTEN_VALUE_##vec;					\
 	beq	masked_##h##interrupt

 #define _SOFTEN_TEST(h, vec)	__SOFTEN_TEST(h, vec)

 #define SOFTEN_TEST_PR(vec)						\
 	KVMTEST(EXC_STD, vec);						\
 	_SOFTEN_TEST(EXC_STD, vec)

 #define SOFTEN_TEST_HV(vec)						\
 	KVMTEST(EXC_HV, vec);						\
 	_SOFTEN_TEST(EXC_HV, vec)

 #define KVMTEST_PR(vec)							\
 	KVMTEST(EXC_STD, vec)

 #define KVMTEST_HV(vec)							\
 	KVMTEST(EXC_HV, vec)

 #define SOFTEN_NOTEST_PR(vec)		_SOFTEN_TEST(EXC_STD, vec)
 #define SOFTEN_NOTEST_HV(vec)		_SOFTEN_TEST(EXC_HV, vec)

 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)		\
 	SET_SCRATCH0(r13);    /* save r13 */				\
 	EXCEPTION_PROLOG_0(PACA_EXGEN);					\
 	__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);			\
 	EXCEPTION_PROLOG_PSERIES_1(label, h);

 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)		\
 	__MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)

 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label)			\
 	_MASKABLE_EXCEPTION_PSERIES(vec, label,				\
 				    EXC_STD, SOFTEN_TEST_PR)

 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label)			\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec);		\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)

 #define MASKABLE_EXCEPTION_HV(loc, vec, label)				\
 	_MASKABLE_EXCEPTION_PSERIES(vec, label,				\
 				    EXC_HV, SOFTEN_TEST_HV)

 #define MASKABLE_EXCEPTION_HV_OOL(vec, label)				\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
 	EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)

 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)	\
 	SET_SCRATCH0(r13);    /* save r13 */				\
 	EXCEPTION_PROLOG_0(PACA_EXGEN);					\
 	__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec);			\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)

 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)		\
 	__MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)

 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label)		\
 	_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,			\
 					  EXC_STD, SOFTEN_NOTEST_PR)

 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label)			\
 	_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label,			\
 					  EXC_HV, SOFTEN_TEST_HV)

 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label)			\
 	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec);		\
 	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)

 /*
  * Our exception common code can be passed various "additions"
  * to specify the behaviour of interrupts, whether to kick the
  * runlatch, etc...
  */

 /*
  * This addition reconciles our actual IRQ state with the various software
  * flags that track it. This may call C code.
  */
 #define ADD_RECONCILE	RECONCILE_IRQ_STATE(r10,r11)

 #define ADD_NVGPRS				\
 	bl	save_nvgprs

 #define RUNLATCH_ON				\
 BEGIN_FTR_SECTION				\
 	CURRENT_THREAD_INFO(r3, r1);		\
 	ld	r4,TI_LOCAL_FLAGS(r3);		\
 	andi.	r0,r4,_TLF_RUNLATCH;		\
 	beql	ppc64_runlatch_on_trampoline;	\
 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)

 #define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
 	EXCEPTION_PROLOG_COMMON(trap, area);			\
 	/* Volatile regs are potentially clobbered here */	\
 	additions;						\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
 	bl	hdlr;						\
 	b	ret

 /*
  * Exception where stack is already set in r1, r1 is saved in r10, and it
  * continues rather than returns.
  */
 #define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
 	EXCEPTION_PROLOG_COMMON_1();				\
 	EXCEPTION_PROLOG_COMMON_2(area);			\
 	EXCEPTION_PROLOG_COMMON_3(trap);			\
 	/* Volatile regs are potentially clobbered here */	\
 	additions;						\
 	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
 	bl	hdlr

 #define STD_EXCEPTION_COMMON(trap, label, hdlr)			\
 	EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,		\
 		ret_from_except, ADD_NVGPRS;ADD_RECONCILE)

 /*
  * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
  * in the idle task and therefore need the special idle handling
  * (finish nap and runlatch)
  */
 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr)		\
 	EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr,		\
 		ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)

 /*
  * When the idle code in power4_idle puts the CPU into NAP mode,
  * it has to do so in a loop, and relies on the external interrupt
  * and decrementer interrupt entry code to get it out of the loop.
  * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
  * to signal that it is in the loop and needs help to get out.
  */
 #ifdef CONFIG_PPC_970_NAP
 #define FINISH_NAP				\
 BEGIN_FTR_SECTION				\
 	CURRENT_THREAD_INFO(r11, r1);		\
 	ld	r9,TI_LOCAL_FLAGS(r11);		\
 	andi.	r10,r9,_TLF_NAPPING;		\
 	bnel	power4_fixup_nap;		\
 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
 #else
 #define FINISH_NAP
 #endif

 #endif	/* _ASM_POWERPC_EXCEPTION_H */
	#ifndef _ASM_POWERPC_EXCEPTION_H
	#define _ASM_POWERPC_EXCEPTION_H
	/*
	* Extracted from head_64.S
	*
	* PowerPC version
	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	*
	* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
	* Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
	* Adapted for Power Macintosh by Paul Mackerras.
	* Low-level exception handlers and MMU support
	* rewritten by Paul Mackerras.
	* Copyright (C) 1996 Paul Mackerras.
	*
	* Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
	* Mike Corrigan {engebret\|bergner\|mikejc}@us.ibm.com
	*
	* This file contains the low-level support and setup for the
	* PowerPC-64 platform, including trap and interrupt dispatch.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/
	/*
	* The following macros define the code that appears as
	* the prologue to each of the exception handlers. They
	* are split into two parts to allow a single kernel binary
	* to be used for pSeries and iSeries.
	*
	* We make as much of the exception code common between native
	* exception handlers (including pSeries LPAR) and iSeries LPAR
	* implementations as possible.
	*/
	#include <asm/head-64.h>

	/* PACA save area offsets (exgen, exmc, etc) */
	#define EX_R9 0
	#define EX_R10 8
	#define EX_R11 16
	#define EX_R12 24
	#define EX_R13 32
	#define EX_DAR 40
	#define EX_DSISR 48
	#define EX_CCR 52
	#define EX_CFAR 56
	#define EX_PPR 64
	#if defined(CONFIG_RELOCATABLE)
	#define EX_CTR 72
	#define EX_SIZE 10 /* size in u64 units */
	#else
	#define EX_SIZE 9 /* size in u64 units */
	#endif

	/*
	* maximum recursive depth of MCE exceptions
	*/
	#define MAX_MCE_DEPTH 4

	/*
	* EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
	* EX_CCR similarly with DSISR, but being 4 byte registers there is a hole
	* in the save area so it's not necessary to overlap them. Could be used
	* for future savings though if another 4 byte register was to be saved.
	*/
	#define EX_LR EX_DAR

	/*
	* EX_R3 is only used by the bad_stack handler. bad_stack reloads and
	* saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
	* with EX_DAR.
	*/
	#define EX_R3 EX_DAR

	#ifdef CONFIG_RELOCATABLE
	#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
	mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
	LOAD_HANDLER(r12,label); \
	mtctr r12; \
	mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
	li r10,MSR_RI; \
	mtmsrd r10,1; /* Set RI (EE=0) */ \
	bctr;
	#else
	/* If not relocatable, we can jump directly -- and save messing with LR */
	#define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
	mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
	mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
	li r10,MSR_RI; \
	mtmsrd r10,1; /* Set RI (EE=0) */ \
	b label;
	#endif
	#define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
	__EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \

	/*
	* As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
	* so no need to rfid. Save lr in case we're CONFIG_RELOCATABLE, in which
	* case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
	*/
	#define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec) \
	EXCEPTION_PROLOG_0(area); \
	EXCEPTION_PROLOG_1(area, extra, vec); \
	EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)

	/*
	* We're short on space and time in the exception prolog, so we can't
	* use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
	* Instead we get the base of the kernel from paca->kernelbase and or in the low
	* part of label. This requires that the label be within 64KB of kernelbase, and
	* that kernelbase be 64K aligned.
	*/
	#define LOAD_HANDLER(reg, label) \
	ld reg,PACAKBASE(r13); /* get high part of &label */ \
	ori reg,reg,FIXED_SYMBOL_ABS_ADDR(label);

	#define __LOAD_HANDLER(reg, label) \
	ld reg,PACAKBASE(r13); \
	ori reg,reg,(ABS_ADDR(label))@l;

	/*
	* Branches from unrelocated code (e.g., interrupts) to labels outside
	* head-y require >64K offsets.
	*/
	#define __LOAD_FAR_HANDLER(reg, label) \
	ld reg,PACAKBASE(r13); \
	ori reg,reg,(ABS_ADDR(label))@l; \
	addis reg,reg,(ABS_ADDR(label))@h;

	/* Exception register prefixes */
	#define EXC_HV H
	#define EXC_STD

	#if defined(CONFIG_RELOCATABLE)
	/*
	* If we support interrupts with relocation on AND we're a relocatable kernel,
	* we need to use CTR to get to the 2nd level handler. So, save/restore it
	* when required.
	*/
	#define SAVE_CTR(reg, area) mfctr reg ; std reg,area+EX_CTR(r13)
	#define GET_CTR(reg, area) ld reg,area+EX_CTR(r13)
	#define RESTORE_CTR(reg, area) ld reg,area+EX_CTR(r13) ; mtctr reg
	#else
	/* ...else CTR is unused and in register. */
	#define SAVE_CTR(reg, area)
	#define GET_CTR(reg, area) mfctr reg
	#define RESTORE_CTR(reg, area)
	#endif

	/*
	* PPR save/restore macros used in exceptions_64s.S
	* Used for P7 or later processors
	*/
	#define SAVE_PPR(area, ra, rb) \
	BEGIN_FTR_SECTION_NESTED(940) \
	ld ra,PACACURRENT(r13); \
	ld rb,area+EX_PPR(r13); /* Read PPR from paca */ \
	std rb,TASKTHREADPPR(ra); \
	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)

	#define RESTORE_PPR_PACA(area, ra) \
	BEGIN_FTR_SECTION_NESTED(941) \
	ld ra,area+EX_PPR(r13); \
	mtspr SPRN_PPR,ra; \
	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)

	/*
	* Get an SPR into a register if the CPU has the given feature
	*/
	#define OPT_GET_SPR(ra, spr, ftr) \
	BEGIN_FTR_SECTION_NESTED(943) \
	mfspr ra,spr; \
	END_FTR_SECTION_NESTED(ftr,ftr,943)

	/*
	* Set an SPR from a register if the CPU has the given feature
	*/
	#define OPT_SET_SPR(ra, spr, ftr) \
	BEGIN_FTR_SECTION_NESTED(943) \
	mtspr spr,ra; \
	END_FTR_SECTION_NESTED(ftr,ftr,943)

	/*
	* Save a register to the PACA if the CPU has the given feature
	*/
	#define OPT_SAVE_REG_TO_PACA(offset, ra, ftr) \
	BEGIN_FTR_SECTION_NESTED(943) \
	std ra,offset(r13); \
	END_FTR_SECTION_NESTED(ftr,ftr,943)

	#define EXCEPTION_PROLOG_0(area) \
	GET_PACA(r13); \
	std r9,area+EX_R9(r13); /* save r9 */ \
	OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \
	HMT_MEDIUM; \
	std r10,area+EX_R10(r13); /* save r10 - r12 */ \
	OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)

	#define __EXCEPTION_PROLOG_1(area, extra, vec) \
	OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR); \
	OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR); \
	SAVE_CTR(r10, area); \
	mfcr r9; \
	extra(vec); \
	std r11,area+EX_R11(r13); \
	std r12,area+EX_R12(r13); \
	GET_SCRATCH0(r10); \
	std r10,area+EX_R13(r13)
	#define EXCEPTION_PROLOG_1(area, extra, vec) \
	__EXCEPTION_PROLOG_1(area, extra, vec)

	#define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
	ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
	mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
	LOAD_HANDLER(r12,label) \
	mtspr SPRN_##h##SRR0,r12; \
	mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
	mtspr SPRN_##h##SRR1,r10; \
	h##rfid; \
	b . /* prevent speculative execution */
	#define EXCEPTION_PROLOG_PSERIES_1(label, h) \
	__EXCEPTION_PROLOG_PSERIES_1(label, h)

	/* _NORI variant keeps MSR_RI clear */
	#define __EXCEPTION_PROLOG_PSERIES_1_NORI(label, h) \
	ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
	xori r10,r10,MSR_RI; /* Clear MSR_RI */ \
	mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
	LOAD_HANDLER(r12,label) \
	mtspr SPRN_##h##SRR0,r12; \
	mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
	mtspr SPRN_##h##SRR1,r10; \
	h##rfid; \
	b . /* prevent speculative execution */

	#define EXCEPTION_PROLOG_PSERIES_1_NORI(label, h) \
	__EXCEPTION_PROLOG_PSERIES_1_NORI(label, h)

	#define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
	EXCEPTION_PROLOG_0(area); \
	EXCEPTION_PROLOG_1(area, extra, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, h);

	#define __KVMTEST(h, n) \
	lbz r10,HSTATE_IN_GUEST(r13); \
	cmpwi r10,0; \
	bne do_kvm_##h##n

	#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	/*
	* If hv is possible, interrupts come into to the hv version
	* of the kvmppc_interrupt code, which then jumps to the PR handler,
	* kvmppc_interrupt_pr, if the guest is a PR guest.
	*/
	#define kvmppc_interrupt kvmppc_interrupt_hv
	#else
	#define kvmppc_interrupt kvmppc_interrupt_pr
	#endif

	/*
	* Branch to label using its 0xC000 address. This results in instruction
	* address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
	* on using mtmsr rather than rfid.
	*
	* This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
	* load KBASE for a slight optimisation.
	*/
	#define BRANCH_TO_C000(reg, label) \
	__LOAD_HANDLER(reg, label); \
	mtctr reg; \
	bctr

	#ifdef CONFIG_RELOCATABLE
	#define BRANCH_TO_COMMON(reg, label) \
	__LOAD_HANDLER(reg, label); \
	mtctr reg; \
	bctr

	#define BRANCH_LINK_TO_FAR(label) \
	__LOAD_FAR_HANDLER(r12, label); \
	mtctr r12; \
	bctrl

	/*
	* KVM requires __LOAD_FAR_HANDLER.
	*
	* __BRANCH_TO_KVM_EXIT branches are also a special case because they
	* explicitly use r9 then reload it from PACA before branching. Hence
	* the double-underscore.
	*/
	#define __BRANCH_TO_KVM_EXIT(area, label) \
	mfctr r9; \
	std r9,HSTATE_SCRATCH1(r13); \
	__LOAD_FAR_HANDLER(r9, label); \
	mtctr r9; \
	ld r9,area+EX_R9(r13); \
	bctr

	#else
	#define BRANCH_TO_COMMON(reg, label) \
	b label

	#define BRANCH_LINK_TO_FAR(label) \
	bl label

	#define __BRANCH_TO_KVM_EXIT(area, label) \
	ld r9,area+EX_R9(r13); \
	b label

	#endif

	/* Do not enable RI */
	#define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec) \
	EXCEPTION_PROLOG_0(area); \
	EXCEPTION_PROLOG_1(area, extra, vec); \
	EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);


	#define __KVM_HANDLER(area, h, n) \
	BEGIN_FTR_SECTION_NESTED(947) \
	ld r10,area+EX_CFAR(r13); \
	std r10,HSTATE_CFAR(r13); \
	END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947); \
	BEGIN_FTR_SECTION_NESTED(948) \
	ld r10,area+EX_PPR(r13); \
	std r10,HSTATE_PPR(r13); \
	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
	ld r10,area+EX_R10(r13); \
	std r12,HSTATE_SCRATCH0(r13); \
	sldi r12,r9,32; \
	ori r12,r12,(n); \
	/* This reloads r9 before branching to kvmppc_interrupt */ \
	__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt)

	#define __KVM_HANDLER_SKIP(area, h, n) \
	cmpwi r10,KVM_GUEST_MODE_SKIP; \
	beq 89f; \
	BEGIN_FTR_SECTION_NESTED(948) \
	ld r10,area+EX_PPR(r13); \
	std r10,HSTATE_PPR(r13); \
	END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
	ld r10,area+EX_R10(r13); \
	std r12,HSTATE_SCRATCH0(r13); \
	sldi r12,r9,32; \
	ori r12,r12,(n); \
	/* This reloads r9 before branching to kvmppc_interrupt */ \
	__BRANCH_TO_KVM_EXIT(area, kvmppc_interrupt); \
	89: mtocrf 0x80,r9; \
	ld r9,area+EX_R9(r13); \
	ld r10,area+EX_R10(r13); \
	b kvmppc_skip_##h##interrupt

	#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
	#define KVMTEST(h, n) __KVMTEST(h, n)
	#define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n)
	#define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)

	#else
	#define KVMTEST(h, n)
	#define KVM_HANDLER(area, h, n)
	#define KVM_HANDLER_SKIP(area, h, n)
	#endif

	#define NOTEST(n)

	#define EXCEPTION_PROLOG_COMMON_1() \
	std r9,_CCR(r1); /* save CR in stackframe */ \
	std r11,_NIP(r1); /* save SRR0 in stackframe */ \
	std r12,_MSR(r1); /* save SRR1 in stackframe */ \
	std r10,0(r1); /* make stack chain pointer */ \
	std r0,GPR0(r1); /* save r0 in stackframe */ \
	std r10,GPR1(r1); /* save r1 in stackframe */ \


	/*
	* The common exception prolog is used for all except a few exceptions
	* such as a segment miss on a kernel address. We have to be prepared
	* to take another exception from the point where we first touch the
	* kernel stack onwards.
	*
	* On entry r13 points to the paca, r9-r13 are saved in the paca,
	* r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
	* SRR1, and relocation is on.
	*/
	#define EXCEPTION_PROLOG_COMMON(n, area) \
	andi. r10,r12,MSR_PR; /* See if coming from user */ \
	mr r10,r1; /* Save r1 */ \
	subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
	beq- 1f; \
	ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
	1: cmpdi cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace */ \
	blt+ cr1,3f; /* abort if it is */ \
	li r1,(n); /* will be reloaded later */ \
	sth r1,PACA_TRAP_SAVE(r13); \
	std r3,area+EX_R3(r13); \
	addi r3,r13,area; /* r3 -> where regs are saved*/ \
	RESTORE_CTR(r1, area); \
	b bad_stack; \
	3: EXCEPTION_PROLOG_COMMON_1(); \
	beq 4f; /* if from kernel mode */ \
	ACCOUNT_CPU_USER_ENTRY(r13, r9, r10); \
	SAVE_PPR(area, r9, r10); \
	4: EXCEPTION_PROLOG_COMMON_2(area) \
	EXCEPTION_PROLOG_COMMON_3(n) \
	ACCOUNT_STOLEN_TIME

	/* Save original regs values from save area to stack frame. */
	#define EXCEPTION_PROLOG_COMMON_2(area) \
	ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
	ld r10,area+EX_R10(r13); \
	std r9,GPR9(r1); \
	std r10,GPR10(r1); \
	ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
	ld r10,area+EX_R12(r13); \
	ld r11,area+EX_R13(r13); \
	std r9,GPR11(r1); \
	std r10,GPR12(r1); \
	std r11,GPR13(r1); \
	BEGIN_FTR_SECTION_NESTED(66); \
	ld r10,area+EX_CFAR(r13); \
	std r10,ORIG_GPR3(r1); \
	END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
	GET_CTR(r10, area); \
	std r10,_CTR(r1);

	#define EXCEPTION_PROLOG_COMMON_3(n) \
	std r2,GPR2(r1); /* save r2 in stackframe */ \
	SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
	SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
	mflr r9; /* Get LR, later save to stack */ \
	ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
	std r9,_LINK(r1); \
	lbz r10,PACASOFTIRQEN(r13); \
	mfspr r11,SPRN_XER; /* save XER in stackframe */ \
	std r10,SOFTE(r1); \
	std r11,_XER(r1); \
	li r9,(n)+1; \
	std r9,_TRAP(r1); /* set trap number */ \
	li r10,0; \
	ld r11,exception_marker@toc(r2); \
	std r10,RESULT(r1); /* clear regs->result */ \
	std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */

	/*
	* Exception vectors.
	*/
	#define STD_EXCEPTION_PSERIES(vec, label) \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
	EXC_STD, KVMTEST_PR, vec); \

	/* Version of above for when we have to branch out-of-line */
	#define __OOL_EXCEPTION(vec, label, hdlr) \
	SET_SCRATCH0(r13) \
	EXCEPTION_PROLOG_0(PACA_EXGEN) \
	b hdlr;

	#define STD_EXCEPTION_PSERIES_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)

	#define STD_EXCEPTION_HV(loc, vec, label) \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
	EXC_HV, KVMTEST_HV, vec);

	#define STD_EXCEPTION_HV_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)

	#define STD_RELON_EXCEPTION_PSERIES(loc, vec, label) \
	/* No guest interrupts come through here */ \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);

	#define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)

	#define STD_RELON_EXCEPTION_HV(loc, vec, label) \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, \
	EXC_HV, KVMTEST_HV, vec);

	#define STD_RELON_EXCEPTION_HV_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec); \
	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)

	/* This associate vector numbers with bits in paca->irq_happened */
	#define SOFTEN_VALUE_0x500 PACA_IRQ_EE
	#define SOFTEN_VALUE_0x900 PACA_IRQ_DEC
	#define SOFTEN_VALUE_0x980 PACA_IRQ_DEC
	#define SOFTEN_VALUE_0xa00 PACA_IRQ_DBELL
	#define SOFTEN_VALUE_0xe80 PACA_IRQ_DBELL
	#define SOFTEN_VALUE_0xe60 PACA_IRQ_HMI
	#define SOFTEN_VALUE_0xea0 PACA_IRQ_EE

	#define __SOFTEN_TEST(h, vec) \
	lbz r10,PACASOFTIRQEN(r13); \
	cmpwi r10,0; \
	li r10,SOFTEN_VALUE_##vec; \
	beq masked_##h##interrupt

	#define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec)

	#define SOFTEN_TEST_PR(vec) \
	KVMTEST(EXC_STD, vec); \
	_SOFTEN_TEST(EXC_STD, vec)

	#define SOFTEN_TEST_HV(vec) \
	KVMTEST(EXC_HV, vec); \
	_SOFTEN_TEST(EXC_HV, vec)

	#define KVMTEST_PR(vec) \
	KVMTEST(EXC_STD, vec)

	#define KVMTEST_HV(vec) \
	KVMTEST(EXC_HV, vec)

	#define SOFTEN_NOTEST_PR(vec) _SOFTEN_TEST(EXC_STD, vec)
	#define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec)

	#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_PROLOG_0(PACA_EXGEN); \
	__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, h);

	#define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
	__MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)

	#define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \
	_MASKABLE_EXCEPTION_PSERIES(vec, label, \
	EXC_STD, SOFTEN_TEST_PR)

	#define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)

	#define MASKABLE_EXCEPTION_HV(loc, vec, label) \
	_MASKABLE_EXCEPTION_PSERIES(vec, label, \
	EXC_HV, SOFTEN_TEST_HV)

	#define MASKABLE_EXCEPTION_HV_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \
	EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)

	#define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
	SET_SCRATCH0(r13); /* save r13 */ \
	EXCEPTION_PROLOG_0(PACA_EXGEN); \
	__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
	EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)

	#define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
	__MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)

	#define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label) \
	_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
	EXC_STD, SOFTEN_NOTEST_PR)

	#define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \
	_MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
	EXC_HV, SOFTEN_TEST_HV)

	#define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label) \
	EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \
	EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)

	/*
	* Our exception common code can be passed various "additions"
	* to specify the behaviour of interrupts, whether to kick the
	* runlatch, etc...
	*/

	/*
	* This addition reconciles our actual IRQ state with the various software
	* flags that track it. This may call C code.
	*/
	#define ADD_RECONCILE RECONCILE_IRQ_STATE(r10,r11)

	#define ADD_NVGPRS \
	bl save_nvgprs

	#define RUNLATCH_ON \
	BEGIN_FTR_SECTION \
	CURRENT_THREAD_INFO(r3, r1); \
	ld r4,TI_LOCAL_FLAGS(r3); \
	andi. r0,r4,_TLF_RUNLATCH; \
	beql ppc64_runlatch_on_trampoline; \
	END_FTR_SECTION_IFSET(CPU_FTR_CTRL)

	#define EXCEPTION_COMMON(area, trap, label, hdlr, ret, additions) \
	EXCEPTION_PROLOG_COMMON(trap, area); \
	/* Volatile regs are potentially clobbered here */ \
	additions; \
	addi r3,r1,STACK_FRAME_OVERHEAD; \
	bl hdlr; \
	b ret

	/*
	* Exception where stack is already set in r1, r1 is saved in r10, and it
	* continues rather than returns.
	*/
	#define EXCEPTION_COMMON_NORET_STACK(area, trap, label, hdlr, additions) \
	EXCEPTION_PROLOG_COMMON_1(); \
	EXCEPTION_PROLOG_COMMON_2(area); \
	EXCEPTION_PROLOG_COMMON_3(trap); \
	/* Volatile regs are potentially clobbered here */ \
	additions; \
	addi r3,r1,STACK_FRAME_OVERHEAD; \
	bl hdlr

	#define STD_EXCEPTION_COMMON(trap, label, hdlr) \
	EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr, \
	ret_from_except, ADD_NVGPRS;ADD_RECONCILE)

	/*
	* Like STD_EXCEPTION_COMMON, but for exceptions that can occur
	* in the idle task and therefore need the special idle handling
	* (finish nap and runlatch)
	*/
	#define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \
	EXCEPTION_COMMON(PACA_EXGEN, trap, label, hdlr, \
	ret_from_except_lite, FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)

	/*
	* When the idle code in power4_idle puts the CPU into NAP mode,
	* it has to do so in a loop, and relies on the external interrupt
	* and decrementer interrupt entry code to get it out of the loop.
	* It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
	* to signal that it is in the loop and needs help to get out.
	*/
	#ifdef CONFIG_PPC_970_NAP
	#define FINISH_NAP \
	BEGIN_FTR_SECTION \
	CURRENT_THREAD_INFO(r11, r1); \
	ld r9,TI_LOCAL_FLAGS(r11); \
	andi. r10,r9,_TLF_NAPPING; \
	bnel power4_fixup_nap; \
	END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
	#else
	#define FINISH_NAP
	#endif

	#endif /* _ASM_POWERPC_EXCEPTION_H */