[mirror_ubuntu-zesty-kernel.git] / arch / powerpc / kernel / head_booke.h

#ifndef __HEAD_BOOKE_H__
#define __HEAD_BOOKE_H__

#include <asm/ptrace.h>	/* for STACK_FRAME_REGS_MARKER */
#include <asm/kvm_asm.h>
#include <asm/kvm_booke_hv_asm.h>

/*
 * Macros used for common Book-e exception handling
 */

#define SET_IVOR(vector_number, vector_label)		\
		li	r26,vector_label@l; 		\
		mtspr	SPRN_IVOR##vector_number,r26;	\
		sync

#if (THREAD_SHIFT < 15)
#define ALLOC_STACK_FRAME(reg, val)			\
	addi reg,reg,val
#else
#define ALLOC_STACK_FRAME(reg, val)			\
	addis	reg,reg,val@ha;				\
	addi	reg,reg,val@l
#endif

/*
 * Macro used to get to thread save registers.
 * Note that entries 0-3 are used for the prolog code, and the remaining
 * entries are available for specific exception use in the event a handler
 * requires more than 4 scratch registers.
 */
#define THREAD_NORMSAVE(offset)	(THREAD_NORMSAVES + (offset * 4))

#define NORMAL_EXCEPTION_PROLOG(intno)						     \
	mtspr	SPRN_SPRG_WSCRATCH0, r10;	/* save one register */	     \
	mfspr	r10, SPRN_SPRG_THREAD;					     \
	stw	r11, THREAD_NORMSAVE(0)(r10);				     \
	stw	r13, THREAD_NORMSAVE(2)(r10);				     \
	mfcr	r13;			/* save CR in r13 for now	   */\
	mfspr	r11, SPRN_SRR1;		                                     \
	DO_KVM	BOOKE_INTERRUPT_##intno SPRN_SRR1;			     \
	andi.	r11, r11, MSR_PR;	/* check whether user or kernel    */\
	mr	r11, r1;						     \
	beq	1f;							     \
	/* if from user, start at top of this thread's kernel stack */       \
	lwz	r11, THREAD_INFO-THREAD(r10);				     \
	ALLOC_STACK_FRAME(r11, THREAD_SIZE);				     \
1 :	subi	r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */     \
	stw	r13, _CCR(r11);		/* save various registers */	     \
	stw	r12,GPR12(r11);						     \
	stw	r9,GPR9(r11);						     \
	mfspr	r13, SPRN_SPRG_RSCRATCH0;				     \
	stw	r13, GPR10(r11);					     \
	lwz	r12, THREAD_NORMSAVE(0)(r10);				     \
	stw	r12,GPR11(r11);						     \
	lwz	r13, THREAD_NORMSAVE(2)(r10); /* restore r13 */		     \
	mflr	r10;							     \
	stw	r10,_LINK(r11);						     \
	mfspr	r12,SPRN_SRR0;						     \
	stw	r1, GPR1(r11);						     \
	mfspr	r9,SPRN_SRR1;						     \
	stw	r1, 0(r11);						     \
	mr	r1, r11;						     \
	rlwinm	r9,r9,0,14,12;		/* clear MSR_WE (necessary?)	   */\
	stw	r0,GPR0(r11);						     \
	lis	r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
	addi	r10, r10, STACK_FRAME_REGS_MARKER@l;			     \
	stw	r10, 8(r11);						     \
	SAVE_4GPRS(3, r11);						     \
	SAVE_2GPRS(7, r11)

/* To handle the additional exception priority levels on 40x and Book-E
 * processors we allocate a stack per additional priority level.
 *
 * On 40x critical is the only additional level
 * On 44x/e500 we have critical and machine check
 * On e200 we have critical and debug (machine check occurs via critical)
 *
 * Additionally we reserve a SPRG for each priority level so we can free up a
 * GPR to use as the base for indirect access to the exception stacks.  This
 * is necessary since the MMU is always on, for Book-E parts, and the stacks
 * are offset from KERNELBASE.
 *
 * There is some space optimization to be had here if desired.  However
 * to allow for a common kernel with support for debug exceptions either
 * going to critical or their own debug level we aren't currently
 * providing configurations that micro-optimize space usage.
 */

#define MC_STACK_BASE		mcheckirq_ctx
#define CRIT_STACK_BASE		critirq_ctx

/* only on e500mc/e200 */
#define DBG_STACK_BASE		dbgirq_ctx

#define EXC_LVL_FRAME_OVERHEAD	(THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)

#ifdef CONFIG_SMP
#define BOOKE_LOAD_EXC_LEVEL_STACK(level)		\
	mfspr	r8,SPRN_PIR;				\
	slwi	r8,r8,2;				\
	addis	r8,r8,level##_STACK_BASE@ha;		\
	lwz	r8,level##_STACK_BASE@l(r8);		\
	addi	r8,r8,EXC_LVL_FRAME_OVERHEAD;
#else
#define BOOKE_LOAD_EXC_LEVEL_STACK(level)		\
	lis	r8,level##_STACK_BASE@ha;		\
	lwz	r8,level##_STACK_BASE@l(r8);		\
	addi	r8,r8,EXC_LVL_FRAME_OVERHEAD;
#endif

/*
 * Exception prolog for critical/machine check exceptions.  This is a
 * little different from the normal exception prolog above since a
 * critical/machine check exception can potentially occur at any point
 * during normal exception processing. Thus we cannot use the same SPRG
 * registers as the normal prolog above. Instead we use a portion of the
 * critical/machine check exception stack at low physical addresses.
 */
#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, intno, exc_level_srr0, exc_level_srr1) \
	mtspr	SPRN_SPRG_WSCRATCH_##exc_level,r8;			     \
	BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
	stw	r9,GPR9(r8);		/* save various registers	   */\
	mfcr	r9;			/* save CR in r9 for now	   */\
	stw	r10,GPR10(r8);						     \
	stw	r11,GPR11(r8);						     \
	stw	r9,_CCR(r8);		/* save CR on stack		   */\
	mfspr	r11,exc_level_srr1;	/* check whether user or kernel    */\
	DO_KVM	BOOKE_INTERRUPT_##intno exc_level_srr1;		             \
	andi.	r11,r11,MSR_PR;						     \
	mfspr	r11,SPRN_SPRG_THREAD;	/* if from user, start at top of   */\
	lwz	r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
	addi	r11,r11,EXC_LVL_FRAME_OVERHEAD;	/* allocate stack frame    */\
	beq	1f;							     \
	/* COMING FROM USER MODE */					     \
	stw	r9,_CCR(r11);		/* save CR			   */\
	lwz	r10,GPR10(r8);		/* copy regs from exception stack  */\
	lwz	r9,GPR9(r8);						     \
	stw	r10,GPR10(r11);						     \
	lwz	r10,GPR11(r8);						     \
	stw	r9,GPR9(r11);						     \
	stw	r10,GPR11(r11);						     \
	b	2f;							     \
	/* COMING FROM PRIV MODE */					     \
1:	lwz	r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r11);		     \
	lwz	r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r11);		     \
	stw	r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r8);			     \
	stw	r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r8);		     \
	lwz	r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r11);			     \
	stw	r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r8);			     \
	mr	r11,r8;							     \
2:	mfspr	r8,SPRN_SPRG_RSCRATCH_##exc_level;			     \
	stw	r12,GPR12(r11);		/* save various registers	   */\
	mflr	r10;							     \
	stw	r10,_LINK(r11);						     \
	mfspr	r12,SPRN_DEAR;		/* save DEAR and ESR in the frame  */\
	stw	r12,_DEAR(r11);		/* since they may have had stuff   */\
	mfspr	r9,SPRN_ESR;		/* in them at the point where the  */\
	stw	r9,_ESR(r11);		/* exception was taken		   */\
	mfspr	r12,exc_level_srr0;					     \
	stw	r1,GPR1(r11);						     \
	mfspr	r9,exc_level_srr1;					     \
	stw	r1,0(r11);						     \
	mr	r1,r11;							     \
	rlwinm	r9,r9,0,14,12;		/* clear MSR_WE (necessary?)	   */\
	stw	r0,GPR0(r11);						     \
	SAVE_4GPRS(3, r11);						     \
	SAVE_2GPRS(7, r11)

#define CRITICAL_EXCEPTION_PROLOG(intno) \
		EXC_LEVEL_EXCEPTION_PROLOG(CRIT, intno, SPRN_CSRR0, SPRN_CSRR1)
#define DEBUG_EXCEPTION_PROLOG \
		EXC_LEVEL_EXCEPTION_PROLOG(DBG, DEBUG, SPRN_DSRR0, SPRN_DSRR1)
#define MCHECK_EXCEPTION_PROLOG \
		EXC_LEVEL_EXCEPTION_PROLOG(MC, MACHINE_CHECK, \
			SPRN_MCSRR0, SPRN_MCSRR1)

/*
 * Guest Doorbell -- this is a bit odd in that uses GSRR0/1 despite
 * being delivered to the host.  This exception can only happen
 * inside a KVM guest -- so we just handle up to the DO_KVM rather
 * than try to fit this into one of the existing prolog macros.
 */
#define GUEST_DOORBELL_EXCEPTION \
	START_EXCEPTION(GuestDoorbell);					     \
	mtspr	SPRN_SPRG_WSCRATCH0, r10;	/* save one register */	     \
	mfspr	r10, SPRN_SPRG_THREAD;					     \
	stw	r11, THREAD_NORMSAVE(0)(r10);				     \
	mfspr	r11, SPRN_SRR1;		                                     \
	stw	r13, THREAD_NORMSAVE(2)(r10);				     \
	mfcr	r13;			/* save CR in r13 for now	   */\
	DO_KVM	BOOKE_INTERRUPT_GUEST_DBELL SPRN_GSRR1;			     \
	trap

/*
 * Exception vectors.
 */
#define	START_EXCEPTION(label)						     \
        .align 5;              						     \
label:

#define EXCEPTION(n, intno, label, hdlr, xfer)			\
	START_EXCEPTION(label);					\
	NORMAL_EXCEPTION_PROLOG(intno);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	xfer(n, hdlr)

#define CRITICAL_EXCEPTION(n, intno, label, hdlr)			\
	START_EXCEPTION(label);						\
	CRITICAL_EXCEPTION_PROLOG(intno);				\
	addi	r3,r1,STACK_FRAME_OVERHEAD;				\
	EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
			  NOCOPY, crit_transfer_to_handler, \
			  ret_from_crit_exc)

#define MCHECK_EXCEPTION(n, label, hdlr)			\
	START_EXCEPTION(label);					\
	MCHECK_EXCEPTION_PROLOG;				\
	mfspr	r5,SPRN_ESR;					\
	stw	r5,_ESR(r11);					\
	addi	r3,r1,STACK_FRAME_OVERHEAD;			\
	EXC_XFER_TEMPLATE(hdlr, n+4, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
			  NOCOPY, mcheck_transfer_to_handler,   \
			  ret_from_mcheck_exc)

#define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret)	\
	li	r10,trap;					\
	stw	r10,_TRAP(r11);					\
	lis	r10,msr@h;					\
	ori	r10,r10,msr@l;					\
	copyee(r10, r9);					\
	bl	tfer;		 				\
	.long	hdlr;						\
	.long	ret

#define COPY_EE(d, s)		rlwimi d,s,0,16,16
#define NOCOPY(d, s)

#define EXC_XFER_STD(n, hdlr)		\
	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
			  ret_from_except_full)

#define EXC_XFER_LITE(n, hdlr)		\
	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
			  ret_from_except)

#define EXC_XFER_EE(n, hdlr)		\
	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
			  ret_from_except_full)

#define EXC_XFER_EE_LITE(n, hdlr)	\
	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
			  ret_from_except)

/* Check for a single step debug exception while in an exception
 * handler before state has been saved.  This is to catch the case
 * where an instruction that we are trying to single step causes
 * an exception (eg ITLB/DTLB miss) and thus the first instruction of
 * the exception handler generates a single step debug exception.
 *
 * If we get a debug trap on the first instruction of an exception handler,
 * we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is
 * a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR).
 * The exception handler was handling a non-critical interrupt, so it will
 * save (and later restore) the MSR via SPRN_CSRR1, which will still have
 * the MSR_DE bit set.
 */
#define DEBUG_DEBUG_EXCEPTION						      \
	START_EXCEPTION(DebugDebug);					      \
	DEBUG_EXCEPTION_PROLOG;						      \
									      \
	/*								      \
	 * If there is a single step or branch-taken exception in an	      \
	 * exception entry sequence, it was probably meant to apply to	      \
	 * the code where the exception occurred (since exception entry	      \
	 * doesn't turn off DE automatically).  We simulate the effect	      \
	 * of turning off DE on entry to an exception handler by turning      \
	 * off DE in the DSRR1 value and clearing the debug status.	      \
	 */								      \
	mfspr	r10,SPRN_DBSR;		/* check single-step/branch taken */  \
	andis.	r10,r10,(DBSR_IC|DBSR_BT)@h;				      \
	beq+	2f;							      \
									      \
	lis	r10,interrupt_base@h;	/* check if exception in vectors */   \
	ori	r10,r10,interrupt_base@l;				      \
	cmplw	r12,r10;						      \
	blt+	2f;			/* addr below exception vectors */    \
									      \
	lis	r10,interrupt_end@h;					      \
	ori	r10,r10,interrupt_end@l;				      \
	cmplw	r12,r10;						      \
	bgt+	2f;			/* addr above exception vectors */    \
									      \
	/* here it looks like we got an inappropriate debug exception. */     \
1:	rlwinm	r9,r9,0,~MSR_DE;	/* clear DE in the CDRR1 value */     \
	lis	r10,(DBSR_IC|DBSR_BT)@h;	/* clear the IC event */      \
	mtspr	SPRN_DBSR,r10;						      \
	/* restore state and get out */					      \
	lwz	r10,_CCR(r11);						      \
	lwz	r0,GPR0(r11);						      \
	lwz	r1,GPR1(r11);						      \
	mtcrf	0x80,r10;						      \
	mtspr	SPRN_DSRR0,r12;						      \
	mtspr	SPRN_DSRR1,r9;						      \
	lwz	r9,GPR9(r11);						      \
	lwz	r12,GPR12(r11);						      \
	mtspr	SPRN_SPRG_WSCRATCH_DBG,r8;				      \
	BOOKE_LOAD_EXC_LEVEL_STACK(DBG); /* r8 points to the debug stack */ \
	lwz	r10,GPR10(r8);						      \
	lwz	r11,GPR11(r8);						      \
	mfspr	r8,SPRN_SPRG_RSCRATCH_DBG;				      \
									      \
	PPC_RFDI;							      \
	b	.;							      \
									      \
	/* continue normal handling for a debug exception... */		      \
2:	mfspr	r4,SPRN_DBSR;						      \
	addi	r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc)

#define DEBUG_CRIT_EXCEPTION						      \
	START_EXCEPTION(DebugCrit);					      \
	CRITICAL_EXCEPTION_PROLOG(DEBUG);				      \
									      \
	/*								      \
	 * If there is a single step or branch-taken exception in an	      \
	 * exception entry sequence, it was probably meant to apply to	      \
	 * the code where the exception occurred (since exception entry	      \
	 * doesn't turn off DE automatically).  We simulate the effect	      \
	 * of turning off DE on entry to an exception handler by turning      \
	 * off DE in the CSRR1 value and clearing the debug status.	      \
	 */								      \
	mfspr	r10,SPRN_DBSR;		/* check single-step/branch taken */  \
	andis.	r10,r10,(DBSR_IC|DBSR_BT)@h;				      \
	beq+	2f;							      \
									      \
	lis	r10,interrupt_base@h;	/* check if exception in vectors */   \
	ori	r10,r10,interrupt_base@l;				      \
	cmplw	r12,r10;						      \
	blt+	2f;			/* addr below exception vectors */    \
									      \
	lis	r10,interrupt_end@h;					      \
	ori	r10,r10,interrupt_end@l;				      \
	cmplw	r12,r10;						      \
	bgt+	2f;			/* addr above exception vectors */    \
									      \
	/* here it looks like we got an inappropriate debug exception. */     \
1:	rlwinm	r9,r9,0,~MSR_DE;	/* clear DE in the CSRR1 value */     \
	lis	r10,(DBSR_IC|DBSR_BT)@h;	/* clear the IC event */      \
	mtspr	SPRN_DBSR,r10;						      \
	/* restore state and get out */					      \
	lwz	r10,_CCR(r11);						      \
	lwz	r0,GPR0(r11);						      \
	lwz	r1,GPR1(r11);						      \
	mtcrf	0x80,r10;						      \
	mtspr	SPRN_CSRR0,r12;						      \
	mtspr	SPRN_CSRR1,r9;						      \
	lwz	r9,GPR9(r11);						      \
	lwz	r12,GPR12(r11);						      \
	mtspr	SPRN_SPRG_WSCRATCH_CRIT,r8;				      \
	BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */  \
	lwz	r10,GPR10(r8);						      \
	lwz	r11,GPR11(r8);						      \
	mfspr	r8,SPRN_SPRG_RSCRATCH_CRIT;				      \
									      \
	rfci;								      \
	b	.;							      \
									      \
	/* continue normal handling for a critical exception... */	      \
2:	mfspr	r4,SPRN_DBSR;						      \
	addi	r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)

#define DATA_STORAGE_EXCEPTION						      \
	START_EXCEPTION(DataStorage)					      \
	NORMAL_EXCEPTION_PROLOG(DATA_STORAGE);		      \
	mfspr	r5,SPRN_ESR;		/* Grab the ESR and save it */	      \
	stw	r5,_ESR(r11);						      \
	mfspr	r4,SPRN_DEAR;		/* Grab the DEAR */		      \
	EXC_XFER_LITE(0x0300, handle_page_fault)

#define INSTRUCTION_STORAGE_EXCEPTION					      \
	START_EXCEPTION(InstructionStorage)				      \
	NORMAL_EXCEPTION_PROLOG(INST_STORAGE);		      \
	mfspr	r5,SPRN_ESR;		/* Grab the ESR and save it */	      \
	stw	r5,_ESR(r11);						      \
	mr      r4,r12;                 /* Pass SRR0 as arg2 */		      \
	li      r5,0;                   /* Pass zero as arg3 */		      \
	EXC_XFER_LITE(0x0400, handle_page_fault)

#define ALIGNMENT_EXCEPTION						      \
	START_EXCEPTION(Alignment)					      \
	NORMAL_EXCEPTION_PROLOG(ALIGNMENT);		      \
	mfspr   r4,SPRN_DEAR;           /* Grab the DEAR and save it */	      \
	stw     r4,_DEAR(r11);						      \
	addi    r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_EE(0x0600, alignment_exception)

#define PROGRAM_EXCEPTION						      \
	START_EXCEPTION(Program)					      \
	NORMAL_EXCEPTION_PROLOG(PROGRAM);		      \
	mfspr	r4,SPRN_ESR;		/* Grab the ESR and save it */	      \
	stw	r4,_ESR(r11);						      \
	addi	r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_STD(0x0700, program_check_exception)

#define DECREMENTER_EXCEPTION						      \
	START_EXCEPTION(Decrementer)					      \
	NORMAL_EXCEPTION_PROLOG(DECREMENTER);		      \
	lis     r0,TSR_DIS@h;           /* Setup the DEC interrupt mask */    \
	mtspr   SPRN_TSR,r0;		/* Clear the DEC interrupt */	      \
	addi    r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_LITE(0x0900, timer_interrupt)

#define FP_UNAVAILABLE_EXCEPTION					      \
	START_EXCEPTION(FloatingPointUnavailable)			      \
	NORMAL_EXCEPTION_PROLOG(FP_UNAVAIL);		      \
	beq	1f;							      \
	bl	load_up_fpu;		/* if from user, just load it up */   \
	b	fast_exception_return;					      \
1:	addi	r3,r1,STACK_FRAME_OVERHEAD;				      \
	EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)

#ifndef __ASSEMBLY__
struct exception_regs {
	unsigned long mas0;
	unsigned long mas1;
	unsigned long mas2;
	unsigned long mas3;
	unsigned long mas6;
	unsigned long mas7;
	unsigned long srr0;
	unsigned long srr1;
	unsigned long csrr0;
	unsigned long csrr1;
	unsigned long dsrr0;
	unsigned long dsrr1;
	unsigned long saved_ksp_limit;
};

/* ensure this structure is always sized to a multiple of the stack alignment */
#define STACK_EXC_LVL_FRAME_SIZE	_ALIGN_UP(sizeof (struct exception_regs), 16)

#endif /* __ASSEMBLY__ */
#endif /* __HEAD_BOOKE_H__ */
Commit	Line	Data
63dafe57 BB	1	#ifndef __HEAD_BOOKE_H__
	2	#define __HEAD_BOOKE_H__
	3
471c70ff	4	#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */
cfac5784	5	#include <asm/kvm_asm.h>
d30f6e48	6	#include <asm/kvm_booke_hv_asm.h>
cfac5784	7
63dafe57 BB	8	/*
	9	* Macros used for common Book-e exception handling
	10	*/
	11
	12	#define SET_IVOR(vector_number, vector_label) \
	13	li r26,vector_label@l; \
	14	mtspr SPRN_IVOR##vector_number,r26; \
	15	sync
	16
e1240122 YT	17	#if (THREAD_SHIFT < 15)
	18	#define ALLOC_STACK_FRAME(reg, val) \
	19	addi reg,reg,val
	20	#else
	21	#define ALLOC_STACK_FRAME(reg, val) \
	22	addis reg,reg,val@ha; \
	23	addi reg,reg,val@l
	24	#endif
	25
1325a684 AK	26	/*
	27	* Macro used to get to thread save registers.
	28	* Note that entries 0-3 are used for the prolog code, and the remaining
	29	* entries are available for specific exception use in the event a handler
	30	* requires more than 4 scratch registers.
	31	*/
	32	#define THREAD_NORMSAVE(offset) (THREAD_NORMSAVES + (offset * 4))
	33
cfac5784	34	#define NORMAL_EXCEPTION_PROLOG(intno) \
1325a684 AK	35	mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
	36	mfspr r10, SPRN_SPRG_THREAD; \
	37	stw r11, THREAD_NORMSAVE(0)(r10); \
	38	stw r13, THREAD_NORMSAVE(2)(r10); \
	39	mfcr r13; /* save CR in r13 for now */\
d30f6e48 SW	40	mfspr r11, SPRN_SRR1; \
	41	DO_KVM BOOKE_INTERRUPT_##intno SPRN_SRR1; \
	42	andi. r11, r11, MSR_PR; /* check whether user or kernel */\
1325a684	43	mr r11, r1; \
63dafe57	44	beq 1f; \
1325a684 AK	45	/* if from user, start at top of this thread's kernel stack */ \
	46	lwz r11, THREAD_INFO-THREAD(r10); \
	47	ALLOC_STACK_FRAME(r11, THREAD_SIZE); \
	48	1 : subi r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */ \
	49	stw r13, _CCR(r11); /* save various registers */ \
63dafe57 BB	50	stw r12,GPR12(r11); \
63dafe57 BB	51	stw r9,GPR9(r11); \
1325a684 AK	52	mfspr r13, SPRN_SPRG_RSCRATCH0; \
	53	stw r13, GPR10(r11); \
	54	lwz r12, THREAD_NORMSAVE(0)(r10); \
63dafe57	55	stw r12,GPR11(r11); \
1325a684	56	lwz r13, THREAD_NORMSAVE(2)(r10); /* restore r13 */ \
63dafe57 BB	57	mflr r10; \
63dafe57 BB	58	stw r10,_LINK(r11); \
63dafe57	59	mfspr r12,SPRN_SRR0; \
1325a684	60	stw r1, GPR1(r11); \
63dafe57	61	mfspr r9,SPRN_SRR1; \
1325a684 AK	62	stw r1, 0(r11); \
1325a684 AK	63	mr r1, r11; \
63dafe57 BB	64	rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
63dafe57 BB	65	stw r0,GPR0(r11); \
471c70ff TS	66	lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
	67	addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
	68	stw r10, 8(r11); \
63dafe57 BB	69	SAVE_4GPRS(3, r11); \
	70	SAVE_2GPRS(7, r11)
	71
	72	/* To handle the additional exception priority levels on 40x and Book-E
bcf0b088	73	* processors we allocate a stack per additional priority level.
63dafe57 BB	74	*
	75	* On 40x critical is the only additional level
	76	* On 44x/e500 we have critical and machine check
	77	* On e200 we have critical and debug (machine check occurs via critical)
	78	*
	79	* Additionally we reserve a SPRG for each priority level so we can free up a
	80	* GPR to use as the base for indirect access to the exception stacks. This
	81	* is necessary since the MMU is always on, for Book-E parts, and the stacks
	82	* are offset from KERNELBASE.
	83	*
eb0cd5fd KG	84	* There is some space optimization to be had here if desired. However
	85	* to allow for a common kernel with support for debug exceptions either
	86	* going to critical or their own debug level we aren't currently
	87	* providing configurations that micro-optimize space usage.
63dafe57	88	*/
63dafe57	89
ee43eb78	90	#define MC_STACK_BASE mcheckirq_ctx
bcf0b088	91	#define CRIT_STACK_BASE critirq_ctx
63dafe57	92
3dfa8773	93	/* only on e500mc/e200 */
ee43eb78	94	#define DBG_STACK_BASE dbgirq_ctx
63dafe57	95
fca622c5	96	#define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)
369e757b	97
63dafe57 BB	98	#ifdef CONFIG_SMP
	99	#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
	100	mfspr r8,SPRN_PIR; \
bcf0b088 KG	101	slwi r8,r8,2; \
	102	addis r8,r8,level##_STACK_BASE@ha; \
	103	lwz r8,level##_STACK_BASE@l(r8); \
369e757b	104	addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
63dafe57 BB	105	#else
63dafe57 BB	106	#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
bcf0b088 KG	107	lis r8,level##_STACK_BASE@ha; \
bcf0b088 KG	108	lwz r8,level##_STACK_BASE@l(r8); \
369e757b	109	addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
63dafe57 BB	110	#endif
	111
	112	/*
	113	* Exception prolog for critical/machine check exceptions. This is a
	114	* little different from the normal exception prolog above since a
	115	* critical/machine check exception can potentially occur at any point
	116	* during normal exception processing. Thus we cannot use the same SPRG
	117	* registers as the normal prolog above. Instead we use a portion of the
	118	* critical/machine check exception stack at low physical addresses.
	119	*/
cfac5784	120	#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, intno, exc_level_srr0, exc_level_srr1) \
ee43eb78	121	mtspr SPRN_SPRG_WSCRATCH_##exc_level,r8; \
63dafe57	122	BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
369e757b KG	123	stw r9,GPR9(r8); /* save various registers */\
	124	mfcr r9; /* save CR in r9 for now */\
	125	stw r10,GPR10(r8); \
	126	stw r11,GPR11(r8); \
	127	stw r9,_CCR(r8); /* save CR on stack */\
d30f6e48 SW	128	mfspr r11,exc_level_srr1; /* check whether user or kernel */\
	129	DO_KVM BOOKE_INTERRUPT_##intno exc_level_srr1; \
	130	andi. r11,r11,MSR_PR; \
ee43eb78	131	mfspr r11,SPRN_SPRG_THREAD; /* if from user, start at top of */\
63dafe57	132	lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
369e757b KG	133	addi r11,r11,EXC_LVL_FRAME_OVERHEAD; /* allocate stack frame */\
	134	beq 1f; \
	135	/* COMING FROM USER MODE */ \
	136	stw r9,_CCR(r11); /* save CR */\
	137	lwz r10,GPR10(r8); /* copy regs from exception stack */\
	138	lwz r9,GPR9(r8); \
	139	stw r10,GPR10(r11); \
	140	lwz r10,GPR11(r8); \
63dafe57	141	stw r9,GPR9(r11); \
369e757b KG	142	stw r10,GPR11(r11); \
	143	b 2f; \
	144	/* COMING FROM PRIV MODE */ \
	145	1: lwz r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r11); \
	146	lwz r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r11); \
	147	stw r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r8); \
	148	stw r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r8); \
	149	lwz r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r11); \
	150	stw r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r8); \
	151	mr r11,r8; \
ee43eb78	152	2: mfspr r8,SPRN_SPRG_RSCRATCH_##exc_level; \
369e757b	153	stw r12,GPR12(r11); /* save various registers */\
63dafe57 BB	154	mflr r10; \
	155	stw r10,_LINK(r11); \
	156	mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\
	157	stw r12,_DEAR(r11); /* since they may have had stuff */\
	158	mfspr r9,SPRN_ESR; /* in them at the point where the */\
	159	stw r9,_ESR(r11); /* exception was taken */\
	160	mfspr r12,exc_level_srr0; \
	161	stw r1,GPR1(r11); \
	162	mfspr r9,exc_level_srr1; \
	163	stw r1,0(r11); \
	164	mr r1,r11; \
	165	rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
	166	stw r0,GPR0(r11); \
	167	SAVE_4GPRS(3, r11); \
	168	SAVE_2GPRS(7, r11)
	169
cfac5784 SW	170	#define CRITICAL_EXCEPTION_PROLOG(intno) \
cfac5784 SW	171	EXC_LEVEL_EXCEPTION_PROLOG(CRIT, intno, SPRN_CSRR0, SPRN_CSRR1)
63dafe57	172	#define DEBUG_EXCEPTION_PROLOG \
cfac5784	173	EXC_LEVEL_EXCEPTION_PROLOG(DBG, DEBUG, SPRN_DSRR0, SPRN_DSRR1)
63dafe57	174	#define MCHECK_EXCEPTION_PROLOG \
cfac5784 SW	175	EXC_LEVEL_EXCEPTION_PROLOG(MC, MACHINE_CHECK, \
cfac5784 SW	176	SPRN_MCSRR0, SPRN_MCSRR1)
63dafe57	177
d30f6e48 SW	178	/*
	179	* Guest Doorbell -- this is a bit odd in that uses GSRR0/1 despite
	180	* being delivered to the host. This exception can only happen
	181	* inside a KVM guest -- so we just handle up to the DO_KVM rather
	182	* than try to fit this into one of the existing prolog macros.
	183	*/
	184	#define GUEST_DOORBELL_EXCEPTION \
	185	START_EXCEPTION(GuestDoorbell); \
	186	mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
	187	mfspr r10, SPRN_SPRG_THREAD; \
	188	stw r11, THREAD_NORMSAVE(0)(r10); \
	189	mfspr r11, SPRN_SRR1; \
	190	stw r13, THREAD_NORMSAVE(2)(r10); \
	191	mfcr r13; /* save CR in r13 for now */\
	192	DO_KVM BOOKE_INTERRUPT_GUEST_DBELL SPRN_GSRR1; \
	193	trap
	194
63dafe57 BB	195	/*
	196	* Exception vectors.
	197	*/
	198	#define START_EXCEPTION(label) \
	199	.align 5; \
	200	label:
	201
cfac5784	202	#define EXCEPTION(n, intno, label, hdlr, xfer) \
63dafe57	203	START_EXCEPTION(label); \
cfac5784	204	NORMAL_EXCEPTION_PROLOG(intno); \
63dafe57 BB	205	addi r3,r1,STACK_FRAME_OVERHEAD; \
	206	xfer(n, hdlr)
	207
cfac5784 SW	208	#define CRITICAL_EXCEPTION(n, intno, label, hdlr) \
	209	START_EXCEPTION(label); \
	210	CRITICAL_EXCEPTION_PROLOG(intno); \
	211	addi r3,r1,STACK_FRAME_OVERHEAD; \
63dafe57 BB	212	EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE)), \
	213	NOCOPY, crit_transfer_to_handler, \
	214	ret_from_crit_exc)
	215
	216	#define MCHECK_EXCEPTION(n, label, hdlr) \
	217	START_EXCEPTION(label); \
	218	MCHECK_EXCEPTION_PROLOG; \
	219	mfspr r5,SPRN_ESR; \
	220	stw r5,_ESR(r11); \
	221	addi r3,r1,STACK_FRAME_OVERHEAD; \
47c0bd1a	222	EXC_XFER_TEMPLATE(hdlr, n+4, (MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE)), \
63dafe57 BB	223	NOCOPY, mcheck_transfer_to_handler, \
	224	ret_from_mcheck_exc)
	225
	226	#define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret) \
	227	li r10,trap; \
	228	stw r10,_TRAP(r11); \
	229	lis r10,msr@h; \
	230	ori r10,r10,msr@l; \
	231	copyee(r10, r9); \
	232	bl tfer; \
	233	.long hdlr; \
	234	.long ret
	235
	236	#define COPY_EE(d, s) rlwimi d,s,0,16,16
	237	#define NOCOPY(d, s)
	238
	239	#define EXC_XFER_STD(n, hdlr) \
	240	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
	241	ret_from_except_full)
	242
	243	#define EXC_XFER_LITE(n, hdlr) \
	244	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
	245	ret_from_except)
	246
	247	#define EXC_XFER_EE(n, hdlr) \
	248	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
	249	ret_from_except_full)
	250
	251	#define EXC_XFER_EE_LITE(n, hdlr) \
	252	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
	253	ret_from_except)
	254
	255	/* Check for a single step debug exception while in an exception
	256	* handler before state has been saved. This is to catch the case
	257	* where an instruction that we are trying to single step causes
	258	* an exception (eg ITLB/DTLB miss) and thus the first instruction of
	259	* the exception handler generates a single step debug exception.
	260	*
	261	* If we get a debug trap on the first instruction of an exception handler,
	262	* we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is
	263	* a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR).
	264	* The exception handler was handling a non-critical interrupt, so it will
	265	* save (and later restore) the MSR via SPRN_CSRR1, which will still have
	266	* the MSR_DE bit set.
	267	*/
eb0cd5fd KG	268	#define DEBUG_DEBUG_EXCEPTION \
eb0cd5fd KG	269	START_EXCEPTION(DebugDebug); \
63dafe57 BB	270	DEBUG_EXCEPTION_PROLOG; \
	271	\
	272	/* \
	273	* If there is a single step or branch-taken exception in an \
	274	* exception entry sequence, it was probably meant to apply to \
	275	* the code where the exception occurred (since exception entry \
	276	* doesn't turn off DE automatically). We simulate the effect \
	277	* of turning off DE on entry to an exception handler by turning \
fec6a822	278	* off DE in the DSRR1 value and clearing the debug status. \
63dafe57 BB	279	*/ \
63dafe57 BB	280	mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
ec097c84	281	andis. r10,r10,(DBSR_IC\|DBSR_BT)@h; \
63dafe57 BB	282	beq+ 2f; \
63dafe57 BB	283	\
fc2a6cfe BB	284	lis r10,interrupt_base@h; /* check if exception in vectors */ \
fc2a6cfe BB	285	ori r10,r10,interrupt_base@l; \
63dafe57 BB	286	cmplw r12,r10; \
	287	blt+ 2f; /* addr below exception vectors */ \
	288	\
fc2a6cfe BB	289	lis r10,interrupt_end@h; \
fc2a6cfe BB	290	ori r10,r10,interrupt_end@l; \
63dafe57 BB	291	cmplw r12,r10; \
	292	bgt+ 2f; /* addr above exception vectors */ \
	293	\
	294	/* here it looks like we got an inappropriate debug exception. */ \
	295	1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CDRR1 value */ \
ec097c84	296	lis r10,(DBSR_IC\|DBSR_BT)@h; /* clear the IC event */ \
63dafe57 BB	297	mtspr SPRN_DBSR,r10; \
	298	/* restore state and get out */ \
	299	lwz r10,_CCR(r11); \
	300	lwz r0,GPR0(r11); \
	301	lwz r1,GPR1(r11); \
	302	mtcrf 0x80,r10; \
	303	mtspr SPRN_DSRR0,r12; \
	304	mtspr SPRN_DSRR1,r9; \
	305	lwz r9,GPR9(r11); \
	306	lwz r12,GPR12(r11); \
ee43eb78 BH	307	mtspr SPRN_SPRG_WSCRATCH_DBG,r8; \
ee43eb78 BH	308	BOOKE_LOAD_EXC_LEVEL_STACK(DBG); /* r8 points to the debug stack */ \
369e757b KG	309	lwz r10,GPR10(r8); \
369e757b KG	310	lwz r11,GPR11(r8); \
ee43eb78	311	mfspr r8,SPRN_SPRG_RSCRATCH_DBG; \
63dafe57	312	\
ee43eb78	313	PPC_RFDI; \
63dafe57 BB	314	b .; \
63dafe57 BB	315	\
fec6a822	316	/* continue normal handling for a debug exception... */ \
63dafe57 BB	317	2: mfspr r4,SPRN_DBSR; \
63dafe57 BB	318	addi r3,r1,STACK_FRAME_OVERHEAD; \
663276b7	319	EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc)
eb0cd5fd KG	320
	321	#define DEBUG_CRIT_EXCEPTION \
	322	START_EXCEPTION(DebugCrit); \
cfac5784	323	CRITICAL_EXCEPTION_PROLOG(DEBUG); \
63dafe57 BB	324	\
	325	/* \
	326	* If there is a single step or branch-taken exception in an \
	327	* exception entry sequence, it was probably meant to apply to \
	328	* the code where the exception occurred (since exception entry \
	329	* doesn't turn off DE automatically). We simulate the effect \
	330	* of turning off DE on entry to an exception handler by turning \
	331	* off DE in the CSRR1 value and clearing the debug status. \
	332	*/ \
	333	mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
ec097c84	334	andis. r10,r10,(DBSR_IC\|DBSR_BT)@h; \
63dafe57 BB	335	beq+ 2f; \
63dafe57 BB	336	\
fc2a6cfe BB	337	lis r10,interrupt_base@h; /* check if exception in vectors */ \
fc2a6cfe BB	338	ori r10,r10,interrupt_base@l; \
63dafe57 BB	339	cmplw r12,r10; \
	340	blt+ 2f; /* addr below exception vectors */ \
	341	\
fc2a6cfe BB	342	lis r10,interrupt_end@h; \
fc2a6cfe BB	343	ori r10,r10,interrupt_end@l; \
63dafe57 BB	344	cmplw r12,r10; \
	345	bgt+ 2f; /* addr above exception vectors */ \
	346	\
	347	/* here it looks like we got an inappropriate debug exception. */ \
	348	1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CSRR1 value */ \
ec097c84	349	lis r10,(DBSR_IC\|DBSR_BT)@h; /* clear the IC event */ \
63dafe57 BB	350	mtspr SPRN_DBSR,r10; \
	351	/* restore state and get out */ \
	352	lwz r10,_CCR(r11); \
	353	lwz r0,GPR0(r11); \
	354	lwz r1,GPR1(r11); \
	355	mtcrf 0x80,r10; \
	356	mtspr SPRN_CSRR0,r12; \
	357	mtspr SPRN_CSRR1,r9; \
	358	lwz r9,GPR9(r11); \
	359	lwz r12,GPR12(r11); \
ee43eb78	360	mtspr SPRN_SPRG_WSCRATCH_CRIT,r8; \
63dafe57	361	BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
369e757b KG	362	lwz r10,GPR10(r8); \
369e757b KG	363	lwz r11,GPR11(r8); \
ee43eb78	364	mfspr r8,SPRN_SPRG_RSCRATCH_CRIT; \
63dafe57 BB	365	\
	366	rfci; \
	367	b .; \
	368	\
	369	/* continue normal handling for a critical exception... */ \
	370	2: mfspr r4,SPRN_DBSR; \
	371	addi r3,r1,STACK_FRAME_OVERHEAD; \
	372	EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME\|MSR_DE\|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
63dafe57	373
1bc54c03 BH	374	#define DATA_STORAGE_EXCEPTION \
1bc54c03 BH	375	START_EXCEPTION(DataStorage) \
cfac5784	376	NORMAL_EXCEPTION_PROLOG(DATA_STORAGE); \
1bc54c03 BH	377	mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
	378	stw r5,_ESR(r11); \
	379	mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
a546498f	380	EXC_XFER_LITE(0x0300, handle_page_fault)
1bc54c03	381
63dafe57 BB	382	#define INSTRUCTION_STORAGE_EXCEPTION \
63dafe57 BB	383	START_EXCEPTION(InstructionStorage) \
cfac5784	384	NORMAL_EXCEPTION_PROLOG(INST_STORAGE); \
63dafe57 BB	385	mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
	386	stw r5,_ESR(r11); \
	387	mr r4,r12; /* Pass SRR0 as arg2 */ \
	388	li r5,0; /* Pass zero as arg3 */ \
a546498f	389	EXC_XFER_LITE(0x0400, handle_page_fault)
63dafe57 BB	390
	391	#define ALIGNMENT_EXCEPTION \
	392	START_EXCEPTION(Alignment) \
cfac5784	393	NORMAL_EXCEPTION_PROLOG(ALIGNMENT); \
63dafe57 BB	394	mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
	395	stw r4,_DEAR(r11); \
	396	addi r3,r1,STACK_FRAME_OVERHEAD; \
	397	EXC_XFER_EE(0x0600, alignment_exception)
	398
	399	#define PROGRAM_EXCEPTION \
	400	START_EXCEPTION(Program) \
cfac5784	401	NORMAL_EXCEPTION_PROLOG(PROGRAM); \
63dafe57 BB	402	mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
	403	stw r4,_ESR(r11); \
	404	addi r3,r1,STACK_FRAME_OVERHEAD; \
	405	EXC_XFER_STD(0x0700, program_check_exception)
	406
	407	#define DECREMENTER_EXCEPTION \
	408	START_EXCEPTION(Decrementer) \
cfac5784	409	NORMAL_EXCEPTION_PROLOG(DECREMENTER); \
63dafe57 BB	410	lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
	411	mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
	412	addi r3,r1,STACK_FRAME_OVERHEAD; \
	413	EXC_XFER_LITE(0x0900, timer_interrupt)
	414
	415	#define FP_UNAVAILABLE_EXCEPTION \
	416	START_EXCEPTION(FloatingPointUnavailable) \
cfac5784	417	NORMAL_EXCEPTION_PROLOG(FP_UNAVAIL); \
6f3d8e69 MN	418	beq 1f; \
	419	bl load_up_fpu; /* if from user, just load it up */ \
	420	b fast_exception_return; \
	421	1: addi r3,r1,STACK_FRAME_OVERHEAD; \
66f2d025	422	EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
63dafe57	423
fca622c5 KG	424	#ifndef __ASSEMBLY__
	425	struct exception_regs {
	426	unsigned long mas0;
	427	unsigned long mas1;
	428	unsigned long mas2;
	429	unsigned long mas3;
	430	unsigned long mas6;
	431	unsigned long mas7;
	432	unsigned long srr0;
	433	unsigned long srr1;
	434	unsigned long csrr0;
	435	unsigned long csrr1;
	436	unsigned long dsrr0;
	437	unsigned long dsrr1;
	438	unsigned long saved_ksp_limit;
	439	};
	440
	441	/* ensure this structure is always sized to a multiple of the stack alignment */
	442	#define STACK_EXC_LVL_FRAME_SIZE _ALIGN_UP(sizeof (struct exception_regs), 16)
	443
	444	#endif /* __ASSEMBLY__ */
63dafe57	445	#endif /* __HEAD_BOOKE_H__ */