459 lines
17 KiB
C
459 lines
17 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __HEAD_BOOKE_H__
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#define __HEAD_BOOKE_H__
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#include <asm/ptrace.h> /* for STACK_FRAME_REGS_MARKER */
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#include <asm/kvm_asm.h>
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#include <asm/kvm_booke_hv_asm.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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#if (THREAD_SHIFT < 15)
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#define ALLOC_STACK_FRAME(reg, val) \
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addi reg,reg,val
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#else
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#define ALLOC_STACK_FRAME(reg, val) \
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addis reg,reg,val@ha; \
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addi reg,reg,val@l
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#endif
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/*
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* Macro used to get to thread save registers.
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* Note that entries 0-3 are used for the prolog code, and the remaining
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* entries are available for specific exception use in the event a handler
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* requires more than 4 scratch registers.
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*/
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#define THREAD_NORMSAVE(offset) (THREAD_NORMSAVES + (offset * 4))
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#ifdef CONFIG_PPC_FSL_BOOK3E
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#define BOOKE_CLEAR_BTB(reg) \
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START_BTB_FLUSH_SECTION \
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BTB_FLUSH(reg) \
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END_BTB_FLUSH_SECTION
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#else
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#define BOOKE_CLEAR_BTB(reg)
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#endif
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#define NORMAL_EXCEPTION_PROLOG(intno) \
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mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
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mfspr r10, SPRN_SPRG_THREAD; \
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stw r11, THREAD_NORMSAVE(0)(r10); \
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stw r13, THREAD_NORMSAVE(2)(r10); \
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mfcr r13; /* save CR in r13 for now */\
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mfspr r11, SPRN_SRR1; \
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DO_KVM BOOKE_INTERRUPT_##intno SPRN_SRR1; \
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andi. r11, r11, MSR_PR; /* check whether user or kernel */\
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mr r11, r1; \
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beq 1f; \
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BOOKE_CLEAR_BTB(r11) \
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/* if from user, start at top of this thread's kernel stack */ \
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lwz r11, THREAD_INFO-THREAD(r10); \
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ALLOC_STACK_FRAME(r11, THREAD_SIZE); \
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1 : subi r11, r11, INT_FRAME_SIZE; /* Allocate exception frame */ \
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stw r13, _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 r13, SPRN_SPRG_RSCRATCH0; \
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stw r13, GPR10(r11); \
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lwz r12, THREAD_NORMSAVE(0)(r10); \
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stw r12,GPR11(r11); \
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lwz r13, THREAD_NORMSAVE(2)(r10); /* restore r13 */ \
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mflr r10; \
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stw r10,_LINK(r11); \
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mfspr r12,SPRN_SRR0; \
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stw r1, GPR1(r11); \
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mfspr r9,SPRN_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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lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
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addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
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stw r10, 8(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 stack per additional priority level.
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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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* On e200 we have critical and debug (machine check occurs via critical)
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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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* There is some space optimization to be had here if desired. However
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* to allow for a common kernel with support for debug exceptions either
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* going to critical or their own debug level we aren't currently
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* providing configurations that micro-optimize space usage.
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*/
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#define MC_STACK_BASE mcheckirq_ctx
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#define CRIT_STACK_BASE critirq_ctx
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/* only on e500mc/e200 */
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#define DBG_STACK_BASE dbgirq_ctx
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#define EXC_LVL_FRAME_OVERHEAD (THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)
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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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slwi r8,r8,2; \
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addis r8,r8,level##_STACK_BASE@ha; \
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lwz r8,level##_STACK_BASE@l(r8); \
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addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
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#else
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#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
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lis r8,level##_STACK_BASE@ha; \
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lwz r8,level##_STACK_BASE@l(r8); \
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addi r8,r8,EXC_LVL_FRAME_OVERHEAD;
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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, intno, exc_level_srr0, exc_level_srr1) \
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mtspr SPRN_SPRG_WSCRATCH_##exc_level,r8; \
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BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
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stw r9,GPR9(r8); /* save various registers */\
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mfcr r9; /* save CR in r9 for now */\
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stw r10,GPR10(r8); \
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stw r11,GPR11(r8); \
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stw r9,_CCR(r8); /* save CR on stack */\
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mfspr r11,exc_level_srr1; /* check whether user or kernel */\
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DO_KVM BOOKE_INTERRUPT_##intno exc_level_srr1; \
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BOOKE_CLEAR_BTB(r10) \
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andi. r11,r11,MSR_PR; \
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mfspr r11,SPRN_SPRG_THREAD; /* 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,EXC_LVL_FRAME_OVERHEAD; /* allocate stack frame */\
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beq 1f; \
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/* COMING FROM USER MODE */ \
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stw r9,_CCR(r11); /* save CR */\
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lwz r10,GPR10(r8); /* copy regs from exception stack */\
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lwz r9,GPR9(r8); \
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stw r10,GPR10(r11); \
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lwz r10,GPR11(r8); \
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stw r9,GPR9(r11); \
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stw r10,GPR11(r11); \
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b 2f; \
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/* COMING FROM PRIV MODE */ \
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1: lwz r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r11); \
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lwz r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r11); \
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stw r9,TI_FLAGS-EXC_LVL_FRAME_OVERHEAD(r8); \
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stw r10,TI_PREEMPT-EXC_LVL_FRAME_OVERHEAD(r8); \
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lwz r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r11); \
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stw r9,TI_TASK-EXC_LVL_FRAME_OVERHEAD(r8); \
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mr r11,r8; \
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2: mfspr r8,SPRN_SPRG_RSCRATCH_##exc_level; \
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stw r12,GPR12(r11); /* save various registers */\
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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(intno) \
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EXC_LEVEL_EXCEPTION_PROLOG(CRIT, intno, SPRN_CSRR0, SPRN_CSRR1)
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#define DEBUG_EXCEPTION_PROLOG \
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EXC_LEVEL_EXCEPTION_PROLOG(DBG, DEBUG, SPRN_DSRR0, SPRN_DSRR1)
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#define MCHECK_EXCEPTION_PROLOG \
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EXC_LEVEL_EXCEPTION_PROLOG(MC, MACHINE_CHECK, \
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SPRN_MCSRR0, SPRN_MCSRR1)
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/*
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* Guest Doorbell -- this is a bit odd in that uses GSRR0/1 despite
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* being delivered to the host. This exception can only happen
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* inside a KVM guest -- so we just handle up to the DO_KVM rather
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* than try to fit this into one of the existing prolog macros.
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*/
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#define GUEST_DOORBELL_EXCEPTION \
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START_EXCEPTION(GuestDoorbell); \
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mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
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mfspr r10, SPRN_SPRG_THREAD; \
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stw r11, THREAD_NORMSAVE(0)(r10); \
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mfspr r11, SPRN_SRR1; \
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stw r13, THREAD_NORMSAVE(2)(r10); \
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mfcr r13; /* save CR in r13 for now */\
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DO_KVM BOOKE_INTERRUPT_GUEST_DBELL SPRN_GSRR1; \
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trap
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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 EXCEPTION(n, intno, label, hdlr, xfer) \
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START_EXCEPTION(label); \
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NORMAL_EXCEPTION_PROLOG(intno); \
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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, intno, label, hdlr) \
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START_EXCEPTION(label); \
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CRITICAL_EXCEPTION_PROLOG(intno); \
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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+4, (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_DEBUG_EXCEPTION \
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START_EXCEPTION(DebugDebug); \
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DEBUG_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 DSRR1 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|DBSR_BT)@h; \
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beq+ 2f; \
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\
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lis r10,interrupt_base@h; /* check if exception in vectors */ \
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ori r10,r10,interrupt_base@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,interrupt_end@h; \
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ori r10,r10,interrupt_end@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 CDRR1 value */ \
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lis r10,(DBSR_IC|DBSR_BT)@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_DSRR0,r12; \
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mtspr SPRN_DSRR1,r9; \
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lwz r9,GPR9(r11); \
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lwz r12,GPR12(r11); \
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mtspr SPRN_SPRG_WSCRATCH_DBG,r8; \
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BOOKE_LOAD_EXC_LEVEL_STACK(DBG); /* r8 points to the debug stack */ \
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lwz r10,GPR10(r8); \
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lwz r11,GPR11(r8); \
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mfspr r8,SPRN_SPRG_RSCRATCH_DBG; \
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\
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PPC_RFDI; \
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b .; \
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\
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/* continue normal handling for a debug 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, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, debug_transfer_to_handler, ret_from_debug_exc)
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#define DEBUG_CRIT_EXCEPTION \
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START_EXCEPTION(DebugCrit); \
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CRITICAL_EXCEPTION_PROLOG(DEBUG); \
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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|DBSR_BT)@h; \
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beq+ 2f; \
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\
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lis r10,interrupt_base@h; /* check if exception in vectors */ \
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ori r10,r10,interrupt_base@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,interrupt_end@h; \
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ori r10,r10,interrupt_end@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|DBSR_BT)@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 SPRN_SPRG_WSCRATCH_CRIT,r8; \
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BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
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lwz r10,GPR10(r8); \
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lwz r11,GPR11(r8); \
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mfspr r8,SPRN_SPRG_RSCRATCH_CRIT; \
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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 DATA_STORAGE_EXCEPTION \
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START_EXCEPTION(DataStorage) \
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NORMAL_EXCEPTION_PROLOG(DATA_STORAGE); \
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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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mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
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|
EXC_XFER_LITE(0x0300, handle_page_fault)
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|
|
|
#define INSTRUCTION_STORAGE_EXCEPTION \
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|
START_EXCEPTION(InstructionStorage) \
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|
NORMAL_EXCEPTION_PROLOG(INST_STORAGE); \
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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_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(ALIGNMENT); \
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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, alignment_exception)
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|
|
|
#define PROGRAM_EXCEPTION \
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|
START_EXCEPTION(Program) \
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|
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 \
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|
START_EXCEPTION(Decrementer) \
|
|
NORMAL_EXCEPTION_PROLOG(DECREMENTER); \
|
|
lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
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|
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__ */
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