1492ec8069
4xx and Book-E PPC's have several exception levels. The code to handle each level is fairly regular. Turning the code into macro's will ease the handling of future exception levels (debug) in forth coming chips. Signed-off-by: Kumar Gala <kumar.gala@freescale.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
302 lines
11 KiB
C
302 lines
11 KiB
C
#ifndef __HEAD_BOOKE_H__
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#define __HEAD_BOOKE_H__
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/*
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* Macros used for common Book-e exception handling
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*/
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#define SET_IVOR(vector_number, vector_label) \
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li r26,vector_label@l; \
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mtspr SPRN_IVOR##vector_number,r26; \
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sync
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#define NORMAL_EXCEPTION_PROLOG \
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mtspr SPRN_SPRG0,r10; /* save two registers to work with */\
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mtspr SPRN_SPRG1,r11; \
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mtspr SPRN_SPRG4W,r1; \
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mfcr r10; /* save CR in r10 for now */\
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mfspr r11,SPRN_SRR1; /* check whether user or kernel */\
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andi. r11,r11,MSR_PR; \
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beq 1f; \
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mfspr r1,SPRN_SPRG3; /* if from user, start at top of */\
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lwz r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack */\
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addi r1,r1,THREAD_SIZE; \
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1: subi r1,r1,INT_FRAME_SIZE; /* Allocate an exception frame */\
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mr r11,r1; \
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stw r10,_CCR(r11); /* save various registers */\
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stw r12,GPR12(r11); \
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stw r9,GPR9(r11); \
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mfspr r10,SPRN_SPRG0; \
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stw r10,GPR10(r11); \
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mfspr r12,SPRN_SPRG1; \
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stw r12,GPR11(r11); \
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mflr r10; \
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stw r10,_LINK(r11); \
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mfspr r10,SPRN_SPRG4R; \
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mfspr r12,SPRN_SRR0; \
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stw r10,GPR1(r11); \
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mfspr r9,SPRN_SRR1; \
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stw r10,0(r11); \
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rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
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stw r0,GPR0(r11); \
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SAVE_4GPRS(3, r11); \
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SAVE_2GPRS(7, r11)
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/* To handle the additional exception priority levels on 40x and Book-E
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* processors we allocate a 4k stack per additional priority level. The various
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* head_xxx.S files allocate space (exception_stack_top) for each priority's
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* stack times the number of CPUs
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*
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* On 40x critical is the only additional level
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* On 44x/e500 we have critical and machine check
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*
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* Additionally we reserve a SPRG for each priority level so we can free up a
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* GPR to use as the base for indirect access to the exception stacks. This
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* is necessary since the MMU is always on, for Book-E parts, and the stacks
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* are offset from KERNELBASE.
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*
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*/
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#define BOOKE_EXCEPTION_STACK_SIZE (8192)
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/* CRIT_SPRG only used in critical exception handling */
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#define CRIT_SPRG SPRN_SPRG2
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/* MCHECK_SPRG only used in critical exception handling */
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#define MCHECK_SPRG SPRN_SPRG6W
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#define MCHECK_STACK_TOP (exception_stack_top - 4096)
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#define CRIT_STACK_TOP (exception_stack_top)
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#ifdef CONFIG_SMP
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#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
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mfspr r8,SPRN_PIR; \
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mulli r8,r8,BOOKE_EXCEPTION_STACK_SIZE; \
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neg r8,r8; \
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addis r8,r8,level##_STACK_TOP@ha; \
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addi r8,r8,level##_STACK_TOP@l
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#else
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#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
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lis r8,level##_STACK_TOP@h; \
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ori r8,r8,level##_STACK_TOP@l
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#endif
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/*
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* Exception prolog for critical/machine check exceptions. This is a
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* little different from the normal exception prolog above since a
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* critical/machine check exception can potentially occur at any point
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* during normal exception processing. Thus we cannot use the same SPRG
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* registers as the normal prolog above. Instead we use a portion of the
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* critical/machine check exception stack at low physical addresses.
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*/
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#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, exc_level_srr0, exc_level_srr1) \
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mtspr exc_level##_SPRG,r8; \
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BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
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stw r10,GPR10-INT_FRAME_SIZE(r8); \
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stw r11,GPR11-INT_FRAME_SIZE(r8); \
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mfcr r10; /* save CR in r10 for now */\
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mfspr r11,exc_level_srr1; /* check whether user or kernel */\
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andi. r11,r11,MSR_PR; \
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mr r11,r8; \
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mfspr r8,exc_level##_SPRG; \
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beq 1f; \
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/* COMING FROM USER MODE */ \
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mfspr r11,SPRN_SPRG3; /* if from user, start at top of */\
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lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
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addi r11,r11,THREAD_SIZE; \
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1: subi r11,r11,INT_FRAME_SIZE; /* Allocate an exception frame */\
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stw r10,_CCR(r11); /* save various registers */\
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stw r12,GPR12(r11); \
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stw r9,GPR9(r11); \
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mflr r10; \
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stw r10,_LINK(r11); \
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mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\
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stw r12,_DEAR(r11); /* since they may have had stuff */\
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mfspr r9,SPRN_ESR; /* in them at the point where the */\
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stw r9,_ESR(r11); /* exception was taken */\
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mfspr r12,exc_level_srr0; \
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stw r1,GPR1(r11); \
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mfspr r9,exc_level_srr1; \
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stw r1,0(r11); \
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mr r1,r11; \
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rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
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stw r0,GPR0(r11); \
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SAVE_4GPRS(3, r11); \
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SAVE_2GPRS(7, r11)
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#define CRITICAL_EXCEPTION_PROLOG \
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EXC_LEVEL_EXCEPTION_PROLOG(CRIT, SPRN_CSRR0, SPRN_CSRR1)
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#define MCHECK_EXCEPTION_PROLOG \
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EXC_LEVEL_EXCEPTION_PROLOG(MCHECK, SPRN_MCSRR0, SPRN_MCSRR1)
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/*
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* Exception vectors.
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*/
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#define START_EXCEPTION(label) \
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.align 5; \
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label:
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#define FINISH_EXCEPTION(func) \
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bl transfer_to_handler_full; \
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.long func; \
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.long ret_from_except_full
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#define EXCEPTION(n, label, hdlr, xfer) \
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START_EXCEPTION(label); \
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NORMAL_EXCEPTION_PROLOG; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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xfer(n, hdlr)
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#define CRITICAL_EXCEPTION(n, label, hdlr) \
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START_EXCEPTION(label); \
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CRITICAL_EXCEPTION_PROLOG; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
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NOCOPY, crit_transfer_to_handler, \
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ret_from_crit_exc)
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#define MCHECK_EXCEPTION(n, label, hdlr) \
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START_EXCEPTION(label); \
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MCHECK_EXCEPTION_PROLOG; \
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mfspr r5,SPRN_ESR; \
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stw r5,_ESR(r11); \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
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NOCOPY, mcheck_transfer_to_handler, \
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ret_from_mcheck_exc)
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#define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret) \
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li r10,trap; \
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stw r10,TRAP(r11); \
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lis r10,msr@h; \
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ori r10,r10,msr@l; \
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copyee(r10, r9); \
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bl tfer; \
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.long hdlr; \
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.long ret
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#define COPY_EE(d, s) rlwimi d,s,0,16,16
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#define NOCOPY(d, s)
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#define EXC_XFER_STD(n, hdlr) \
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EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
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ret_from_except_full)
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#define EXC_XFER_LITE(n, hdlr) \
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EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
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ret_from_except)
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#define EXC_XFER_EE(n, hdlr) \
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EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
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ret_from_except_full)
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#define EXC_XFER_EE_LITE(n, hdlr) \
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EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
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ret_from_except)
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/* Check for a single step debug exception while in an exception
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* handler before state has been saved. This is to catch the case
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* where an instruction that we are trying to single step causes
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* an exception (eg ITLB/DTLB miss) and thus the first instruction of
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* the exception handler generates a single step debug exception.
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*
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* If we get a debug trap on the first instruction of an exception handler,
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* we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is
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* a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR).
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* The exception handler was handling a non-critical interrupt, so it will
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* save (and later restore) the MSR via SPRN_CSRR1, which will still have
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* the MSR_DE bit set.
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*/
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#define DEBUG_EXCEPTION \
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START_EXCEPTION(Debug); \
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CRITICAL_EXCEPTION_PROLOG; \
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\
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/* \
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* If there is a single step or branch-taken exception in an \
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* exception entry sequence, it was probably meant to apply to \
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* the code where the exception occurred (since exception entry \
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* doesn't turn off DE automatically). We simulate the effect \
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* of turning off DE on entry to an exception handler by turning \
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* off DE in the CSRR1 value and clearing the debug status. \
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*/ \
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mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
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andis. r10,r10,DBSR_IC@h; \
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beq+ 2f; \
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\
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lis r10,KERNELBASE@h; /* check if exception in vectors */ \
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ori r10,r10,KERNELBASE@l; \
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cmplw r12,r10; \
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blt+ 2f; /* addr below exception vectors */ \
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\
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lis r10,Debug@h; \
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ori r10,r10,Debug@l; \
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cmplw r12,r10; \
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bgt+ 2f; /* addr above exception vectors */ \
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\
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/* here it looks like we got an inappropriate debug exception. */ \
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1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CSRR1 value */ \
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lis r10,DBSR_IC@h; /* clear the IC event */ \
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mtspr SPRN_DBSR,r10; \
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/* restore state and get out */ \
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lwz r10,_CCR(r11); \
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lwz r0,GPR0(r11); \
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lwz r1,GPR1(r11); \
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mtcrf 0x80,r10; \
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mtspr SPRN_CSRR0,r12; \
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mtspr SPRN_CSRR1,r9; \
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lwz r9,GPR9(r11); \
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lwz r12,GPR12(r11); \
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mtspr CRIT_SPRG,r8; \
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BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
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lwz r10,GPR10-INT_FRAME_SIZE(r8); \
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lwz r11,GPR11-INT_FRAME_SIZE(r8); \
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mfspr r8,CRIT_SPRG; \
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\
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rfci; \
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b .; \
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\
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/* continue normal handling for a critical exception... */ \
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2: mfspr r4,SPRN_DBSR; \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
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#define INSTRUCTION_STORAGE_EXCEPTION \
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START_EXCEPTION(InstructionStorage) \
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NORMAL_EXCEPTION_PROLOG; \
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mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
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stw r5,_ESR(r11); \
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mr r4,r12; /* Pass SRR0 as arg2 */ \
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li r5,0; /* Pass zero as arg3 */ \
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EXC_XFER_EE_LITE(0x0400, handle_page_fault)
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#define ALIGNMENT_EXCEPTION \
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START_EXCEPTION(Alignment) \
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NORMAL_EXCEPTION_PROLOG; \
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mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
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stw r4,_DEAR(r11); \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_EE(0x0600, AlignmentException)
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#define PROGRAM_EXCEPTION \
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START_EXCEPTION(Program) \
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NORMAL_EXCEPTION_PROLOG; \
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mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
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stw r4,_ESR(r11); \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_STD(0x0700, ProgramCheckException)
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#define DECREMENTER_EXCEPTION \
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START_EXCEPTION(Decrementer) \
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NORMAL_EXCEPTION_PROLOG; \
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lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
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mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_LITE(0x0900, timer_interrupt)
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#define FP_UNAVAILABLE_EXCEPTION \
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START_EXCEPTION(FloatingPointUnavailable) \
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NORMAL_EXCEPTION_PROLOG; \
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bne load_up_fpu; /* if from user, just load it up */ \
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addi r3,r1,STACK_FRAME_OVERHEAD; \
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EXC_XFER_EE_LITE(0x800, KernelFP)
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#endif /* __HEAD_BOOKE_H__ */
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