179 lines
5.1 KiB
ArmAsm
179 lines
5.1 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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* Check for suspend check request. Assumes rINST already loaded, rPC advanced and
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* still needs to get the opcode and branch to it, and flags are in lr.
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*/
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MterpCheckSuspendAndContinue:
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lw rIBASE, THREAD_CURRENT_IBASE_OFFSET(rSELF) # refresh rIBASE
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and ra, (THREAD_SUSPEND_REQUEST | THREAD_CHECKPOINT_REQUEST)
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bnez ra, 1f
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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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1:
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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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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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/* 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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