289 lines
9.5 KiB
ArmAsm
289 lines
9.5 KiB
ArmAsm
/*
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* ===========================================================================
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* Common subroutines and data
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* ===========================================================================
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*/
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.text
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.align 2
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/*
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* We've detected a condition that will result in an exception, but the exception
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* has not yet been thrown. Just bail out to the reference interpreter to deal with it.
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* TUNING: for consistency, we may want to just go ahead and handle these here.
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*/
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common_errDivideByZero:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogDivideByZeroException)
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#endif
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b MterpCommonFallback
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common_errArrayIndex:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogArrayIndexException)
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#endif
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b MterpCommonFallback
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common_errNegativeArraySize:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogNegativeArraySizeException)
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#endif
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b MterpCommonFallback
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common_errNoSuchMethod:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogNoSuchMethodException)
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#endif
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b MterpCommonFallback
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common_errNullObject:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogNullObjectException)
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#endif
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b MterpCommonFallback
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common_exceptionThrown:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogExceptionThrownException)
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#endif
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b MterpCommonFallback
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MterpSuspendFallback:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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lw a2, THREAD_FLAGS_OFFSET(rSELF)
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JAL(MterpLogSuspendFallback)
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#endif
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b MterpCommonFallback
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/*
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* If we're here, something is out of the ordinary. If there is a pending
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* exception, handle it. Otherwise, roll back and retry with the reference
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* interpreter.
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*/
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MterpPossibleException:
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lw a0, THREAD_EXCEPTION_OFFSET(rSELF)
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beqz a0, MterpFallback # If exception, fall back to reference interpreter.
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/* intentional fallthrough - handle pending exception. */
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/*
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* On return from a runtime helper routine, we've found a pending exception.
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* Can we handle it here - or need to bail out to caller?
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*
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*/
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MterpException:
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpHandleException) # (self, shadow_frame)
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beqz v0, MterpExceptionReturn # no local catch, back to caller.
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lw a0, OFF_FP_CODE_ITEM(rFP)
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lw a1, OFF_FP_DEX_PC(rFP)
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lw rIBASE, THREAD_CURRENT_IBASE_OFFSET(rSELF)
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addu rPC, a0, CODEITEM_INSNS_OFFSET
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sll a1, a1, 1
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addu rPC, rPC, a1 # generate new dex_pc_ptr
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/* Do we need to switch interpreters? */
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JAL(MterpShouldSwitchInterpreters)
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bnez v0, MterpFallback
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/* resume execution at catch block */
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EXPORT_PC()
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FETCH_INST()
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GET_INST_OPCODE(t0)
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GOTO_OPCODE(t0)
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/* NOTE: no fallthrough */
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/*
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* Common handling for branches with support for Jit profiling.
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* On entry:
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* rINST <= signed offset
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* rPROFILE <= signed hotness countdown (expanded to 32 bits)
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*
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* We have quite a few different cases for branch profiling, OSR detection and
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* suspend check support here.
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*
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* Taken backward branches:
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* If profiling active, do hotness countdown and report if we hit zero.
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* If in osr check mode, see if our target is a compiled loop header entry and do OSR if so.
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* Is there a pending suspend request? If so, suspend.
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*
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* Taken forward branches and not-taken backward branches:
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* If in osr check mode, see if our target is a compiled loop header entry and do OSR if so.
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*
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* Our most common case is expected to be a taken backward branch with active jit profiling,
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* but no full OSR check and no pending suspend request.
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* Next most common case is not-taken branch with no full OSR check.
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*/
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MterpCommonTakenBranchNoFlags:
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bgtz rINST, .L_forward_branch # don't add forward branches to hotness
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/*
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* We need to subtract 1 from positive values and we should not see 0 here,
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* so we may use the result of the comparison with -1.
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*/
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#if JIT_CHECK_OSR != -1
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# error "JIT_CHECK_OSR must be -1."
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#endif
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li t0, JIT_CHECK_OSR
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beq rPROFILE, t0, .L_osr_check
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blt rPROFILE, t0, .L_resume_backward_branch
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subu rPROFILE, 1
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beqz rPROFILE, .L_add_batch # counted down to zero - report
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.L_resume_backward_branch:
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lw ra, THREAD_FLAGS_OFFSET(rSELF)
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REFRESH_IBASE()
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addu a2, rINST, rINST # a2<- byte offset
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FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST
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and ra, THREAD_SUSPEND_OR_CHECKPOINT_REQUEST
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bnez ra, .L_suspend_request_pending
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GET_INST_OPCODE(t0) # extract opcode from rINST
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GOTO_OPCODE(t0) # jump to next instruction
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.L_suspend_request_pending:
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EXPORT_PC()
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move a0, rSELF
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JAL(MterpSuspendCheck) # (self)
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bnez v0, MterpFallback
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REFRESH_IBASE() # might have changed during suspend
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GET_INST_OPCODE(t0) # extract opcode from rINST
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GOTO_OPCODE(t0) # jump to next instruction
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.L_no_count_backwards:
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li t0, JIT_CHECK_OSR # check for possible OSR re-entry
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bne rPROFILE, t0, .L_resume_backward_branch
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.L_osr_check:
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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move a2, rINST
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EXPORT_PC()
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JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset)
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bnez v0, MterpOnStackReplacement
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b .L_resume_backward_branch
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.L_forward_branch:
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li t0, JIT_CHECK_OSR # check for possible OSR re-entry
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beq rPROFILE, t0, .L_check_osr_forward
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.L_resume_forward_branch:
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add a2, rINST, rINST # a2<- byte offset
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FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST
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GET_INST_OPCODE(t0) # extract opcode from rINST
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GOTO_OPCODE(t0) # jump to next instruction
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.L_check_osr_forward:
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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move a2, rINST
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EXPORT_PC()
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JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset)
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bnez v0, MterpOnStackReplacement
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b .L_resume_forward_branch
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.L_add_batch:
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addu a1, rFP, OFF_FP_SHADOWFRAME
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sh rPROFILE, SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET(a1)
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lw a0, OFF_FP_METHOD(rFP)
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move a2, rSELF
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JAL(MterpAddHotnessBatch) # (method, shadow_frame, self)
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move rPROFILE, v0 # restore new hotness countdown to rPROFILE
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b .L_no_count_backwards
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/*
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* Entered from the conditional branch handlers when OSR check request active on
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* not-taken path. All Dalvik not-taken conditional branch offsets are 2.
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*/
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.L_check_not_taken_osr:
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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li a2, 2
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EXPORT_PC()
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JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset)
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bnez v0, MterpOnStackReplacement
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FETCH_ADVANCE_INST(2)
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GET_INST_OPCODE(t0) # extract opcode from rINST
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GOTO_OPCODE(t0) # jump to next instruction
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/*
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* On-stack replacement has happened, and now we've returned from the compiled method.
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*/
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MterpOnStackReplacement:
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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move a2, rINST
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JAL(MterpLogOSR)
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#endif
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li v0, 1 # Signal normal return
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b MterpDone
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/*
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* Bail out to reference interpreter.
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*/
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MterpFallback:
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EXPORT_PC()
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#if MTERP_LOGGING
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move a0, rSELF
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addu a1, rFP, OFF_FP_SHADOWFRAME
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JAL(MterpLogFallback)
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#endif
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MterpCommonFallback:
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move v0, zero # signal retry with reference interpreter.
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b MterpDone
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/*
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* We pushed some registers on the stack in ExecuteMterpImpl, then saved
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* SP and LR. Here we restore SP, restore the registers, and then restore
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* LR to PC.
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*
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* On entry:
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* uint32_t* rFP (should still be live, pointer to base of vregs)
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*/
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MterpExceptionReturn:
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li v0, 1 # signal return to caller.
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b MterpDone
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MterpReturn:
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lw a2, OFF_FP_RESULT_REGISTER(rFP)
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sw v0, 0(a2)
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sw v1, 4(a2)
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li v0, 1 # signal return to caller.
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MterpDone:
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/*
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* At this point, we expect rPROFILE to be non-zero. If negative, hotness is disabled or we're
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* checking for OSR. If greater than zero, we might have unreported hotness to register
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* (the difference between the ending rPROFILE and the cached hotness counter). rPROFILE
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* should only reach zero immediately after a hotness decrement, and is then reset to either
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* a negative special state or the new non-zero countdown value.
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*/
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blez rPROFILE, .L_pop_and_return # if > 0, we may have some counts to report.
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MterpProfileActive:
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move rINST, v0 # stash return value
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/* Report cached hotness counts */
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lw a0, OFF_FP_METHOD(rFP)
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addu a1, rFP, OFF_FP_SHADOWFRAME
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move a2, rSELF
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sh rPROFILE, SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET(a1)
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JAL(MterpAddHotnessBatch) # (method, shadow_frame, self)
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move v0, rINST # restore return value
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.L_pop_and_return:
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/* Restore from the stack and return. Frame size = STACK_SIZE */
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STACK_LOAD_FULL()
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jalr zero, ra
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.end ExecuteMterpImpl
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