/*
* ===========================================================================
* Common subroutines and data
* ===========================================================================
*/
.text
.align 2
#if defined(WITH_JIT)
/*
* Return from the translation cache to the interpreter when the compiler is
* having issues translating/executing a Dalvik instruction. We have to skip
* the code cache lookup otherwise it is possible to indefinitely bouce
* between the interpreter and the code cache if the instruction that fails
* to be compiled happens to be at a trace start.
*/
.global dvmJitToInterpPunt
dvmJitToInterpPunt:
mov rPC, r0
#ifdef EXIT_STATS
mov r0,lr
bl dvmBumpPunt;
#endif
EXPORT_PC()
adrl rIBASE, dvmAsmInstructionStart
FETCH_INST()
GET_INST_OPCODE(ip)
GOTO_OPCODE(ip)
/*
* Return to the interpreter to handle a single instruction.
* On entry:
* r0 <= PC
* r1 <= PC of resume instruction
* lr <= resume point in translation
*/
.global dvmJitToInterpSingleStep
dvmJitToInterpSingleStep:
str lr,[rGLUE,#offGlue_jitResume]
str r1,[rGLUE,#offGlue_jitResumePC]
mov r1,#kInterpEntryInstr
@ enum is 4 byte in aapcs-EABI
str r1, [rGLUE, #offGlue_entryPoint]
mov rPC,r0
EXPORT_PC()
adrl rIBASE, dvmAsmInstructionStart
mov r2,#kJitSingleStep @ Ask for single step and then revert
str r2,[rGLUE,#offGlue_jitState]
mov r1,#1 @ set changeInterp to bail to debug interp
b common_gotoBail
/*
* Return from the translation cache and immediately request
* a translation for the exit target. Commonly used following
* invokes.
*/
.global dvmJitToTraceSelect
dvmJitToTraceSelect:
ldr rPC,[r14, #-1] @ get our target PC
add rINST,r14,#-5 @ save start of chain branch
mov r0,rPC
bl dvmJitGetCodeAddr @ Is there a translation?
cmp r0,#0
beq 2f
mov r1,rINST
bl dvmJitChain @ r0<- dvmJitChain(codeAddr,chainAddr)
cmp r0,#0 @ successful chain?
bxne r0 @ continue native execution
b toInterpreter @ didn't chain - resume with interpreter
/* No translation, so request one if profiling isn't disabled*/
2:
adrl rIBASE, dvmAsmInstructionStart
GET_JIT_PROF_TABLE(r0)
FETCH_INST()
cmp r0, #0
bne common_selectTrace
GET_INST_OPCODE(ip)
GOTO_OPCODE(ip)
/*
* Return from the translation cache to the interpreter.
* The return was done with a BLX from thumb mode, and
* the following 32-bit word contains the target rPC value.
* Note that lr (r14) will have its low-order bit set to denote
* its thumb-mode origin.
*
* We'll need to stash our lr origin away, recover the new
* target and then check to see if there is a translation available
* for our new target. If so, we do a translation chain and
* go back to native execution. Otherwise, it's back to the
* interpreter (after treating this entry as a potential
* trace start).
*/
.global dvmJitToInterpNormal
dvmJitToInterpNormal:
ldr rPC,[r14, #-1] @ get our target PC
add rINST,r14,#-5 @ save start of chain branch
#ifdef EXIT_STATS
bl dvmBumpNormal
#endif
mov r0,rPC
bl dvmJitGetCodeAddr @ Is there a translation?
cmp r0,#0
beq toInterpreter @ go if not, otherwise do chain
mov r1,rINST
bl dvmJitChain @ r0<- dvmJitChain(codeAddr,chainAddr)
cmp r0,#0 @ successful chain?
bxne r0 @ continue native execution
b toInterpreter @ didn't chain - resume with interpreter
/*
* Return from the translation cache to the interpreter to do method invocation.
* Check if translation exists for the callee, but don't chain to it.
*/
.global dvmJitToInterpNoChain
dvmJitToInterpNoChain:
#ifdef EXIT_STATS
bl dvmBumpNoChain
#endif
mov r0,rPC
bl dvmJitGetCodeAddr @ Is there a translation?
cmp r0,#0
bxne r0 @ continue native execution if so
/*
* No translation, restore interpreter regs and start interpreting.
* rGLUE & rFP were preserved in the translated code, and rPC has
* already been restored by the time we get here. We'll need to set
* up rIBASE & rINST, and load the address of the JitTable into r0.
*/
toInterpreter:
EXPORT_PC()
adrl rIBASE, dvmAsmInstructionStart
FETCH_INST()
GET_JIT_PROF_TABLE(r0)
@ NOTE: intended fallthrough
/*
* Common code to update potential trace start counter, and initiate
* a trace-build if appropriate. On entry, rPC should point to the
* next instruction to execute, and rINST should be already loaded with
* the next opcode word, and r0 holds a pointer to the jit profile
* table (pJitProfTable).
*/
common_testUpdateProfile:
cmp r0,#0
GET_INST_OPCODE(ip)
GOTO_OPCODE_IFEQ(ip) @ if not profiling, fallthrough otherwise */
common_updateProfile:
eor r3,rPC,rPC,lsr #12 @ cheap, but fast hash function
lsl r3,r3,#23 @ shift out excess 511
ldrb r1,[r0,r3,lsr #23] @ get counter
GET_INST_OPCODE(ip)
subs r1,r1,#1 @ decrement counter
strb r1,[r0,r3,lsr #23] @ and store it
GOTO_OPCODE_IFNE(ip) @ if not threshold, fallthrough otherwise */
/*
* Here, we switch to the debug interpreter to request
* trace selection. First, though, check to see if there
* is already a native translation in place (and, if so,
* jump to it now).
*/
mov r1,#255
strb r1,[r0,r3,lsr #23] @ reset counter
EXPORT_PC()
mov r0,rPC
bl dvmJitGetCodeAddr @ r0<- dvmJitGetCodeAddr(rPC)
cmp r0,#0
beq common_selectTrace
bxne r0 @ jump to the translation
common_selectTrace:
mov r2,#kJitTSelectRequest @ ask for trace selection
str r2,[rGLUE,#offGlue_jitState]
mov r1,#1 @ set changeInterp
b common_gotoBail
#endif
/*
* Common code when a backward branch is taken.
*
* On entry:
* r9 is PC adjustment *in bytes*
*/
common_backwardBranch:
mov r0, #kInterpEntryInstr
bl common_periodicChecks
#if defined(WITH_JIT)
GET_JIT_PROF_TABLE(r0)
FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST
cmp r0,#0
bne common_updateProfile
GET_INST_OPCODE(ip)
GOTO_OPCODE(ip)
#else
FETCH_ADVANCE_INST_RB(r9) @ update rPC, load rINST
GET_INST_OPCODE(ip) @ extract opcode from rINST
GOTO_OPCODE(ip) @ jump to next instruction
#endif
/*
* Need to see if the thread needs to be suspended or debugger/profiler
* activity has begun.
*
* TODO: if JDWP isn't running, zero out pDebuggerActive pointer so we don't
* have to do the second ldr.
*
* TODO: reduce this so we're just checking a single location.
*
* On entry:
* r0 is reentry type, e.g. kInterpEntryInstr
* r9 is trampoline PC adjustment *in bytes*
*/
common_periodicChecks:
ldr r3, [rGLUE, #offGlue_pSelfSuspendCount] @ r3<- &suspendCount
#if defined(WITH_DEBUGGER)
ldr r1, [rGLUE, #offGlue_pDebuggerActive] @ r1<- &debuggerActive
#endif
#if defined(WITH_PROFILER)
ldr r2, [rGLUE, #offGlue_pActiveProfilers] @ r2<- &activeProfilers
#endif
ldr r3, [r3] @ r3<- suspendCount (int)
#if defined(WITH_DEBUGGER)
ldrb r1, [r1] @ r1<- debuggerActive (boolean)
#endif
#if defined (WITH_PROFILER)
ldr r2, [r2] @ r2<- activeProfilers (int)
#endif
cmp r3, #0 @ suspend pending?
bne 2f @ yes, do full suspension check
#if defined(WITH_DEBUGGER) || defined(WITH_PROFILER)
# if defined(WITH_DEBUGGER) && defined(WITH_PROFILER)
orrs r1, r1, r2 @ r1<- r1 | r2
cmp r1, #0 @ debugger attached or profiler started?
# elif defined(WITH_DEBUGGER)
cmp r1, #0 @ debugger attached?
# elif defined(WITH_PROFILER)
cmp r2, #0 @ profiler started?
# endif
bne 3f @ debugger/profiler, switch interp
#endif
bx lr @ nothing to do, return
2: @ check suspend
ldr r0, [rGLUE, #offGlue_self] @ r0<- glue->self
EXPORT_PC() @ need for precise GC
b dvmCheckSuspendPending @ suspend if necessary, then return
3: @ debugger/profiler enabled, bail out
add rPC, rPC, r9 @ update rPC
str r0, [rGLUE, #offGlue_entryPoint]
mov r1, #1 @ "want switch" = true
b common_gotoBail
/*
* The equivalent of "goto bail", this calls through the "bail handler".
*
* State registers will be saved to the "glue" area before bailing.
*
* On entry:
* r1 is "bool changeInterp", indicating if we want to switch to the
* other interpreter or just bail all the way out
*/
common_gotoBail:
SAVE_PC_FP_TO_GLUE() @ export state to "glue"
mov r0, rGLUE @ r0<- glue ptr
b dvmMterpStdBail @ call(glue, changeInterp)
@add r1, r1, #1 @ using (boolean+1)
@add r0, rGLUE, #offGlue_jmpBuf @ r0<- &glue->jmpBuf
@bl _longjmp @ does not return
@bl common_abort
/*
* Common code for method invocation with range.
*
* On entry:
* r0 is "Method* methodToCall", the method we're trying to call
*/
common_invokeMethodRange:
.LinvokeNewRange:
@ prepare to copy args to "outs" area of current frame
movs r2, rINST, lsr #8 @ r2<- AA (arg count) -- test for zero
SAVEAREA_FROM_FP(r10, rFP) @ r10<- stack save area
beq .LinvokeArgsDone @ if no args, skip the rest
FETCH(r1, 2) @ r1<- CCCC
@ r0=methodToCall, r1=CCCC, r2=count, r10=outs
@ (very few methods have > 10 args; could unroll for common cases)
add r3, rFP, r1, lsl #2 @ r3<- &fp[CCCC]
sub r10, r10, r2, lsl #2 @ r10<- "outs" area, for call args
ldrh r9, [r0, #offMethod_registersSize] @ r9<- methodToCall->regsSize
1: ldr r1, [r3], #4 @ val = *fp++
subs r2, r2, #1 @ count--
str r1, [r10], #4 @ *outs++ = val
bne 1b @ ...while count != 0
ldrh r3, [r0, #offMethod_outsSize] @ r3<- methodToCall->outsSize
b .LinvokeArgsDone
/*
* Common code for method invocation without range.
*
* On entry:
* r0 is "Method* methodToCall", the method we're trying to call
*/
common_invokeMethodNoRange:
.LinvokeNewNoRange:
@ prepare to copy args to "outs" area of current frame
movs r2, rINST, lsr #12 @ r2<- B (arg count) -- test for zero
SAVEAREA_FROM_FP(r10, rFP) @ r10<- stack save area
FETCH(r1, 2) @ r1<- GFED (load here to hide latency)
ldrh r9, [r0, #offMethod_registersSize] @ r9<- methodToCall->regsSize
ldrh r3, [r0, #offMethod_outsSize] @ r3<- methodToCall->outsSize
beq .LinvokeArgsDone
@ r0=methodToCall, r1=GFED, r3=outSize, r2=count, r9=regSize, r10=outs
.LinvokeNonRange:
rsb r2, r2, #5 @ r2<- 5-r2
add pc, pc, r2, lsl #4 @ computed goto, 4 instrs each
bl common_abort @ (skipped due to ARM prefetch)
5: and ip, rINST, #0x0f00 @ isolate A
ldr r2, [rFP, ip, lsr #6] @ r2<- vA (shift right 8, left 2)
mov r0, r0 @ nop
str r2, [r10, #-4]! @ *--outs = vA
4: and ip, r1, #0xf000 @ isolate G
ldr r2, [rFP, ip, lsr #10] @ r2<- vG (shift right 12, left 2)
mov r0, r0 @ nop
str r2, [r10, #-4]! @ *--outs = vG
3: and ip, r1, #0x0f00 @ isolate F
ldr r2, [rFP, ip, lsr #6] @ r2<- vF
mov r0, r0 @ nop
str r2, [r10, #-4]! @ *--outs = vF
2: and ip, r1, #0x00f0 @ isolate E
ldr r2, [rFP, ip, lsr #2] @ r2<- vE
mov r0, r0 @ nop
str r2, [r10, #-4]! @ *--outs = vE
1: and ip, r1, #0x000f @ isolate D
ldr r2, [rFP, ip, lsl #2] @ r2<- vD
mov r0, r0 @ nop
str r2, [r10, #-4]! @ *--outs = vD
0: @ fall through to .LinvokeArgsDone
.LinvokeArgsDone: @ r0=methodToCall, r3=outSize, r9=regSize
ldr r2, [r0, #offMethod_insns] @ r2<- method->insns
ldr rINST, [r0, #offMethod_clazz] @ rINST<- method->clazz
@ find space for the new stack frame, check for overflow
SAVEAREA_FROM_FP(r1, rFP) @ r1<- stack save area
sub r1, r1, r9, lsl #2 @ r1<- newFp (old savearea - regsSize)
SAVEAREA_FROM_FP(r10, r1) @ r10<- newSaveArea
@ bl common_dumpRegs
ldr r9, [rGLUE, #offGlue_interpStackEnd] @ r9<- interpStackEnd
sub r3, r10, r3, lsl #2 @ r3<- bottom (newsave - outsSize)
cmp r3, r9 @ bottom < interpStackEnd?
ldr r3, [r0, #offMethod_accessFlags] @ r3<- methodToCall->accessFlags
blt .LstackOverflow @ yes, this frame will overflow stack
@ set up newSaveArea
#ifdef EASY_GDB
SAVEAREA_FROM_FP(ip, rFP) @ ip<- stack save area
str ip, [r10, #offStackSaveArea_prevSave]
#endif
str rFP, [r10, #offStackSaveArea_prevFrame]
str rPC, [r10, #offStackSaveArea_savedPc]
#if defined(WITH_JIT)
mov r9, #0
str r9, [r10, #offStackSaveArea_returnAddr]
#endif
str r0, [r10, #offStackSaveArea_method]
tst r3, #ACC_NATIVE
bne .LinvokeNative
/*
stmfd sp!, {r0-r3}
bl common_printNewline
mov r0, rFP
mov r1, #0
bl dvmDumpFp
ldmfd sp!, {r0-r3}
stmfd sp!, {r0-r3}
mov r0, r1
mov r1, r10
bl dvmDumpFp
bl common_printNewline
ldmfd sp!, {r0-r3}
*/
ldrh r9, [r2] @ r9 <- load INST from new PC
ldr r3, [rINST, #offClassObject_pDvmDex] @ r3<- method->clazz->pDvmDex
mov rPC, r2 @ publish new rPC
ldr r2, [rGLUE, #offGlue_self] @ r2<- glue->self
@ Update "glue" values for the new method
@ r0=methodToCall, r1=newFp, r2=self, r3=newMethodClass, r9=newINST
str r0, [rGLUE, #offGlue_method] @ glue->method = methodToCall
str r3, [rGLUE, #offGlue_methodClassDex] @ glue->methodClassDex = ...
#if defined(WITH_JIT)
GET_JIT_PROF_TABLE(r0)
mov rFP, r1 @ fp = newFp
GET_PREFETCHED_OPCODE(ip, r9) @ extract prefetched opcode from r9
mov rINST, r9 @ publish new rINST
str r1, [r2, #offThread_curFrame] @ self->curFrame = newFp
cmp r0,#0
bne common_updateProfile
GOTO_OPCODE(ip) @ jump to next instruction
#else
mov rFP, r1 @ fp = newFp
GET_PREFETCHED_OPCODE(ip, r9) @ extract prefetched opcode from r9
mov rINST, r9 @ publish new rINST
str r1, [r2, #offThread_curFrame] @ self->curFrame = newFp
GOTO_OPCODE(ip) @ jump to next instruction
#endif
.LinvokeNative:
@ Prep for the native call
@ r0=methodToCall, r1=newFp, r10=newSaveArea
ldr r3, [rGLUE, #offGlue_self] @ r3<- glue->self
ldr r9, [r3, #offThread_jniLocal_topCookie] @ r9<- thread->localRef->...
str r1, [r3, #offThread_curFrame] @ self->curFrame = newFp
str r9, [r10, #offStackSaveArea_localRefCookie] @newFp->localRefCookie=top
mov r9, r3 @ r9<- glue->self (preserve)
mov r2, r0 @ r2<- methodToCall
mov r0, r1 @ r0<- newFp (points to args)
add r1, rGLUE, #offGlue_retval @ r1<- &retval
#ifdef ASSIST_DEBUGGER
/* insert fake function header to help gdb find the stack frame */
b .Lskip
.type dalvik_mterp, %function
dalvik_mterp:
.fnstart
MTERP_ENTRY1
MTERP_ENTRY2
.Lskip:
#endif
@mov lr, pc @ set return addr
@ldr pc, [r2, #offMethod_nativeFunc] @ pc<- methodToCall->nativeFunc
LDR_PC_LR "[r2, #offMethod_nativeFunc]"
@ native return; r9=self, r10=newSaveArea
@ equivalent to dvmPopJniLocals
ldr r0, [r10, #offStackSaveArea_localRefCookie] @ r0<- saved top
ldr r1, [r9, #offThread_exception] @ check for exception
str rFP, [r9, #offThread_curFrame] @ self->curFrame = fp
cmp r1, #0 @ null?
str r0, [r9, #offThread_jniLocal_topCookie] @ new top <- old top
bne common_exceptionThrown @ no, handle exception
FETCH_ADVANCE_INST(3) @ advance rPC, load rINST
GET_INST_OPCODE(ip) @ extract opcode from rINST
GOTO_OPCODE(ip) @ jump to next instruction
.LstackOverflow:
ldr r0, [rGLUE, #offGlue_self] @ r0<- self
bl dvmHandleStackOverflow
b common_exceptionThrown
#ifdef ASSIST_DEBUGGER
.fnend
#endif
/*
* Common code for method invocation, calling through "glue code".
*
* TODO: now that we have range and non-range invoke handlers, this
* needs to be split into two. Maybe just create entry points
* that set r9 and jump here?
*
* On entry:
* r0 is "Method* methodToCall", the method we're trying to call
* r9 is "bool methodCallRange", indicating if this is a /range variant
*/
.if 0
.LinvokeOld:
sub sp, sp, #8 @ space for args + pad
FETCH(ip, 2) @ ip<- FEDC or CCCC
mov r2, r0 @ A2<- methodToCall
mov r0, rGLUE @ A0<- glue
SAVE_PC_FP_TO_GLUE() @ export state to "glue"
mov r1, r9 @ A1<- methodCallRange
mov r3, rINST, lsr #8 @ A3<- AA
str ip, [sp, #0] @ A4<- ip
bl dvmMterp_invokeMethod @ call the C invokeMethod
add sp, sp, #8 @ remove arg area
b common_resumeAfterGlueCall @ continue to next instruction
.endif
/*
* Common code for handling a return instruction.
*
* This does not return.
*/
common_returnFromMethod:
.LreturnNew:
mov r0, #kInterpEntryReturn
mov r9, #0
bl common_periodicChecks
SAVEAREA_FROM_FP(r0, rFP) @ r0<- saveArea (old)
ldr rFP, [r0, #offStackSaveArea_prevFrame] @ fp = saveArea->prevFrame
ldr r9, [r0, #offStackSaveArea_savedPc] @ r9 = saveArea->savedPc
ldr r2, [rFP, #(offStackSaveArea_method - sizeofStackSaveArea)]
@ r2<- method we're returning to
ldr r3, [rGLUE, #offGlue_self] @ r3<- glue->self
cmp r2, #0 @ is this a break frame?
ldrne r10, [r2, #offMethod_clazz] @ r10<- method->clazz
mov r1, #0 @ "want switch" = false
beq common_gotoBail @ break frame, bail out completely
PREFETCH_ADVANCE_INST(rINST, r9, 3) @ advance r9, update new rINST
str r2, [rGLUE, #offGlue_method]@ glue->method = newSave->method
ldr r1, [r10, #offClassObject_pDvmDex] @ r1<- method->clazz->pDvmDex
str rFP, [r3, #offThread_curFrame] @ self->curFrame = fp
#if defined(WITH_JIT)
ldr r3, [r0, #offStackSaveArea_returnAddr] @ r3 = saveArea->returnAddr
GET_JIT_PROF_TABLE(r0)
mov rPC, r9 @ publish new rPC
str r1, [rGLUE, #offGlue_methodClassDex]
cmp r3, #0 @ caller is compiled code
blxne r3
GET_INST_OPCODE(ip) @ extract opcode from rINST
cmp r0,#0
bne common_updateProfile
GOTO_OPCODE(ip) @ jump to next instruction
#else
GET_INST_OPCODE(ip) @ extract opcode from rINST
mov rPC, r9 @ publish new rPC
str r1, [rGLUE, #offGlue_methodClassDex]
GOTO_OPCODE(ip) @ jump to next instruction
#endif
/*
* Return handling, calls through "glue code".
*/
.if 0
.LreturnOld:
SAVE_PC_FP_TO_GLUE() @ export state
mov r0, rGLUE @ arg to function
bl dvmMterp_returnFromMethod
b common_resumeAfterGlueCall
.endif
/*
* Somebody has thrown an exception. Handle it.
*
* If the exception processing code returns to us (instead of falling
* out of the interpreter), continue with whatever the next instruction
* now happens to be.
*
* This does not return.
*/
.global dvmMterpCommonExceptionThrown
dvmMterpCommonExceptionThrown:
common_exceptionThrown:
.LexceptionNew:
mov r0, #kInterpEntryThrow
mov r9, #0
bl common_periodicChecks
#if defined(WITH_JIT)
mov r2,#kJitTSelectAbort @ abandon trace selection in progress
str r2,[rGLUE,#offGlue_jitState]
#endif
ldr r10, [rGLUE, #offGlue_self] @ r10<- glue->self
ldr r9, [r10, #offThread_exception] @ r9<- self->exception
mov r1, r10 @ r1<- self
mov r0, r9 @ r0<- exception
bl dvmAddTrackedAlloc @ don't let the exception be GCed
mov r3, #0 @ r3<- NULL
str r3, [r10, #offThread_exception] @ self->exception = NULL
/* set up args and a local for "&fp" */
/* (str sp, [sp, #-4]! would be perfect here, but is discouraged) */
str rFP, [sp, #-4]! @ *--sp = fp
mov ip, sp @ ip<- &fp
mov r3, #0 @ r3<- false
str ip, [sp, #-4]! @ *--sp = &fp
ldr r1, [rGLUE, #offGlue_method] @ r1<- glue->method
mov r0, r10 @ r0<- self
ldr r1, [r1, #offMethod_insns] @ r1<- method->insns
mov r2, r9 @ r2<- exception
sub r1, rPC, r1 @ r1<- pc - method->insns
mov r1, r1, asr #1 @ r1<- offset in code units
/* call, r0 gets catchRelPc (a code-unit offset) */
bl dvmFindCatchBlock @ call(self, relPc, exc, scan?, &fp)
/* fix earlier stack overflow if necessary; may trash rFP */
ldrb r1, [r10, #offThread_stackOverflowed]
cmp r1, #0 @ did we overflow earlier?
beq 1f @ no, skip ahead
mov rFP, r0 @ save relPc result in rFP
mov r0, r10 @ r0<- self
bl dvmCleanupStackOverflow @ call(self)
mov r0, rFP @ restore result
1:
/* update frame pointer and check result from dvmFindCatchBlock */
ldr rFP, [sp, #4] @ retrieve the updated rFP
cmp r0, #0 @ is catchRelPc < 0?
add sp, sp, #8 @ restore stack
bmi .LnotCaughtLocally
/* adjust locals to match self->curFrame and updated PC */
SAVEAREA_FROM_FP(r1, rFP) @ r1<- new save area
ldr r1, [r1, #offStackSaveArea_method] @ r1<- new method
str r1, [rGLUE, #offGlue_method] @ glue->method = new method
ldr r2, [r1, #offMethod_clazz] @ r2<- method->clazz
ldr r3, [r1, #offMethod_insns] @ r3<- method->insns
ldr r2, [r2, #offClassObject_pDvmDex] @ r2<- method->clazz->pDvmDex
add rPC, r3, r0, asl #1 @ rPC<- method->insns + catchRelPc
str r2, [rGLUE, #offGlue_methodClassDex] @ glue->pDvmDex = meth...
/* release the tracked alloc on the exception */
mov r0, r9 @ r0<- exception
mov r1, r10 @ r1<- self
bl dvmReleaseTrackedAlloc @ release the exception
/* restore the exception if the handler wants it */
FETCH_INST() @ load rINST from rPC
GET_INST_OPCODE(ip) @ extract opcode from rINST
cmp ip, #OP_MOVE_EXCEPTION @ is it "move-exception"?
streq r9, [r10, #offThread_exception] @ yes, restore the exception
GOTO_OPCODE(ip) @ jump to next instruction
.LnotCaughtLocally: @ r9=exception, r10=self
/* fix stack overflow if necessary */
ldrb r1, [r10, #offThread_stackOverflowed]
cmp r1, #0 @ did we overflow earlier?
movne r0, r10 @ if yes: r0<- self
blne dvmCleanupStackOverflow @ if yes: call(self)
@ may want to show "not caught locally" debug messages here
#if DVM_SHOW_EXCEPTION >= 2
/* call __android_log_print(prio, tag, format, ...) */
/* "Exception %s from %s:%d not caught locally" */
@ dvmLineNumFromPC(method, pc - method->insns)
ldr r0, [rGLUE, #offGlue_method]
ldr r1, [r0, #offMethod_insns]
sub r1, rPC, r1
asr r1, r1, #1
bl dvmLineNumFromPC
str r0, [sp, #-4]!
@ dvmGetMethodSourceFile(method)
ldr r0, [rGLUE, #offGlue_method]
bl dvmGetMethodSourceFile
str r0, [sp, #-4]!
@ exception->clazz->descriptor
ldr r3, [r9, #offObject_clazz]
ldr r3, [r3, #offClassObject_descriptor]
@
ldr r2, strExceptionNotCaughtLocally
ldr r1, strLogTag
mov r0, #3 @ LOG_DEBUG
bl __android_log_print
#endif
str r9, [r10, #offThread_exception] @ restore exception
mov r0, r9 @ r0<- exception
mov r1, r10 @ r1<- self
bl dvmReleaseTrackedAlloc @ release the exception
mov r1, #0 @ "want switch" = false
b common_gotoBail @ bail out
/*
* Exception handling, calls through "glue code".
*/
.if 0
.LexceptionOld:
SAVE_PC_FP_TO_GLUE() @ export state
mov r0, rGLUE @ arg to function
bl dvmMterp_exceptionThrown
b common_resumeAfterGlueCall
.endif
/*
* After returning from a "glued" function, pull out the updated
* values and start executing at the next instruction.
*/
common_resumeAfterGlueCall:
LOAD_PC_FP_FROM_GLUE() @ pull rPC and rFP out of glue
FETCH_INST() @ load rINST from rPC
GET_INST_OPCODE(ip) @ extract opcode from rINST
GOTO_OPCODE(ip) @ jump to next instruction
/*
* Invalid array index.
*/
common_errArrayIndex:
EXPORT_PC()
ldr r0, strArrayIndexException
mov r1, #0
bl dvmThrowException
b common_exceptionThrown
/*
* Invalid array value.
*/
common_errArrayStore:
EXPORT_PC()
ldr r0, strArrayStoreException
mov r1, #0
bl dvmThrowException
b common_exceptionThrown
/*
* Integer divide or mod by zero.
*/
common_errDivideByZero:
EXPORT_PC()
ldr r0, strArithmeticException
ldr r1, strDivideByZero
bl dvmThrowException
b common_exceptionThrown
/*
* Attempt to allocate an array with a negative size.
*/
common_errNegativeArraySize:
EXPORT_PC()
ldr r0, strNegativeArraySizeException
mov r1, #0
bl dvmThrowException
b common_exceptionThrown
/*
* Invocation of a non-existent method.
*/
common_errNoSuchMethod:
EXPORT_PC()
ldr r0, strNoSuchMethodError
mov r1, #0
bl dvmThrowException
b common_exceptionThrown
/*
* We encountered a null object when we weren't expecting one. We
* export the PC, throw a NullPointerException, and goto the exception
* processing code.
*/
common_errNullObject:
EXPORT_PC()
ldr r0, strNullPointerException
mov r1, #0
bl dvmThrowException
b common_exceptionThrown
/*
* For debugging, cause an immediate fault. The source address will
* be in lr (use a bl instruction to jump here).
*/
common_abort:
ldr pc, .LdeadFood
.LdeadFood:
.word 0xdeadf00d
/*
* Spit out a "we were here", preserving all registers. (The attempt
* to save ip won't work, but we need to save an even number of
* registers for EABI 64-bit stack alignment.)
*/
.macro SQUEAK num
common_squeak\num:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
ldr r0, strSqueak
mov r1, #\num
bl printf
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
.endm
SQUEAK 0
SQUEAK 1
SQUEAK 2
SQUEAK 3
SQUEAK 4
SQUEAK 5
/*
* Spit out the number in r0, preserving registers.
*/
common_printNum:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
mov r1, r0
ldr r0, strSqueak
bl printf
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
/*
* Print a newline, preserving registers.
*/
common_printNewline:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
ldr r0, strNewline
bl printf
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
/*
* Print the 32-bit quantity in r0 as a hex value, preserving registers.
*/
common_printHex:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
mov r1, r0
ldr r0, strPrintHex
bl printf
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
/*
* Print the 64-bit quantity in r0-r1, preserving registers.
*/
common_printLong:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
mov r3, r1
mov r2, r0
ldr r0, strPrintLong
bl printf
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
/*
* Print full method info. Pass the Method* in r0. Preserves regs.
*/
common_printMethod:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
bl dvmMterpPrintMethod
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
/*
* Call a C helper function that dumps regs and possibly some
* additional info. Requires the C function to be compiled in.
*/
.if 0
common_dumpRegs:
stmfd sp!, {r0, r1, r2, r3, ip, lr}
bl dvmMterpDumpArmRegs
ldmfd sp!, {r0, r1, r2, r3, ip, lr}
bx lr
.endif
#if 0
/*
* Experiment on VFP mode.
*
* uint32_t setFPSCR(uint32_t val, uint32_t mask)
*
* Updates the bits specified by "mask", setting them to the values in "val".
*/
setFPSCR:
and r0, r0, r1 @ make sure no stray bits are set
fmrx r2, fpscr @ get VFP reg
mvn r1, r1 @ bit-invert mask
and r2, r2, r1 @ clear masked bits
orr r2, r2, r0 @ set specified bits
fmxr fpscr, r2 @ set VFP reg
mov r0, r2 @ return new value
bx lr
.align 2
.global dvmConfigureFP
.type dvmConfigureFP, %function
dvmConfigureFP:
stmfd sp!, {ip, lr}
/* 0x03000000 sets DN/FZ */
/* 0x00009f00 clears the six exception enable flags */
bl common_squeak0
mov r0, #0x03000000 @ r0<- 0x03000000
add r1, r0, #0x9f00 @ r1<- 0x03009f00
bl setFPSCR
ldmfd sp!, {ip, pc}
#endif
/*
* String references, must be close to the code that uses them.
*/
.align 2
strArithmeticException:
.word .LstrArithmeticException
strArrayIndexException:
.word .LstrArrayIndexException
strArrayStoreException:
.word .LstrArrayStoreException
strDivideByZero:
.word .LstrDivideByZero
strNegativeArraySizeException:
.word .LstrNegativeArraySizeException
strNoSuchMethodError:
.word .LstrNoSuchMethodError
strNullPointerException:
.word .LstrNullPointerException
strLogTag:
.word .LstrLogTag
strExceptionNotCaughtLocally:
.word .LstrExceptionNotCaughtLocally
strNewline:
.word .LstrNewline
strSqueak:
.word .LstrSqueak
strPrintHex:
.word .LstrPrintHex
strPrintLong:
.word .LstrPrintLong
/*
* Zero-terminated ASCII string data.
*
* On ARM we have two choices: do like gcc does, and LDR from a .word
* with the address, or use an ADR pseudo-op to get the address
* directly. ADR saves 4 bytes and an indirection, but it's using a
* PC-relative addressing mode and hence has a limited range, which
* makes it not work well with mergeable string sections.
*/
.section .rodata.str1.4,"aMS",%progbits,1
.LstrBadEntryPoint:
.asciz "Bad entry point %d\n"
.LstrArithmeticException:
.asciz "Ljava/lang/ArithmeticException;"
.LstrArrayIndexException:
.asciz "Ljava/lang/ArrayIndexOutOfBoundsException;"
.LstrArrayStoreException:
.asciz "Ljava/lang/ArrayStoreException;"
.LstrClassCastException:
.asciz "Ljava/lang/ClassCastException;"
.LstrDivideByZero:
.asciz "divide by zero"
.LstrFilledNewArrayNotImpl:
.asciz "filled-new-array only implemented for objects and 'int'"
.LstrInternalError:
.asciz "Ljava/lang/InternalError;"
.LstrInstantiationError:
.asciz "Ljava/lang/InstantiationError;"
.LstrNegativeArraySizeException:
.asciz "Ljava/lang/NegativeArraySizeException;"
.LstrNoSuchMethodError:
.asciz "Ljava/lang/NoSuchMethodError;"
.LstrNullPointerException:
.asciz "Ljava/lang/NullPointerException;"
.LstrLogTag:
.asciz "mterp"
.LstrExceptionNotCaughtLocally:
.asciz "Exception %s from %s:%d not caught locally\n"
.LstrNewline:
.asciz "\n"
.LstrSqueak:
.asciz "<%d>"
.LstrPrintHex:
.asciz "<0x%x>"
.LstrPrintLong:
.asciz "<%lld>"