src/runtime_support_asm.S

#include "asm_support.h"

#if defined(__arm__)

    .balign 4

    /* Deliver the given exception */
    .extern artDeliverExceptionFromCode
    /* Deliver an exception pending on a thread */
    .extern artDeliverPendingException

    /*
     * Macro that sets up the callee save frame to conform with
     * Runtime::CreateCalleeSaveMethod(kSaveAll)
     */
.macro SETUP_CALLEE_SAVE_FRAME
    push {r4-r11, lr} @ 9 words of callee saves
    vpush {s0-s31}
    sub sp, #12       @ 3 words of space, bottom word will hold Method*
.endm

    /*
     * Macro that sets up the callee save frame to conform with
     * Runtime::CreateCalleeSaveMethod(kRefsOnly)
     */
.macro SETUP_REF_ONLY_CALLEE_SAVE_FRAME
    push {r5-r8, r10-r11, lr} @ 7 words of callee saves
    sub sp, #4                @ bottom word will hold Method*
.endm

.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    add sp, #4
    pop {r5-r8, r10-r11, lr}  @ 7 words of callee saves
.endm

.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
    add sp, #4
    pop {r5-r8, r10-r11, pc}  @ 7 words of callee saves
.endm

    /*
     * Macro that sets up the callee save frame to conform with
     * Runtime::CreateCalleeSaveMethod(kRefsAndArgs)
     */
.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
    push {r1-r3, r5-r8, r10-r11, lr} @ 10 words of callee saves
    sub sp, #8                       @ 2 words of space, bottom word will hold Method*
.endm

.macro RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
    add sp, #8
    pop {r1-r3, r5-r8, r10-r11, lr}  @ 10 words of callee saves
.endm

    /*
     * Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending
     * exception is Thread::Current()->exception_
     */
.macro DELIVER_PENDING_EXCEPTION
    SETUP_CALLEE_SAVE_FRAME                    @ save callee saves for throw
    mov    r0, r9                              @ pass Thread::Current
    mov    r1, sp                              @ pass SP
    b      artDeliverPendingExceptionFromCode  @ artDeliverPendingExceptionFromCode(Thread*, SP)
.endm

    .global art_deliver_exception_from_code
    /*
     * Called by managed code, saves mosts registers (forms basis of long jump context) and passes
     * the bottom of the stack. artDeliverExceptionFromCode will place the callee save Method* at
     * the bottom of the thread. On entry r0 holds Throwable*
     */
art_deliver_exception_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r1, r9                      @ pass Thread::Current
    mov r2, sp                      @ pass SP
    b   artDeliverExceptionFromCode @ artDeliverExceptionFromCode(Throwable*, Thread*, SP)

    .global art_throw_null_pointer_exception_from_code
    .extern artThrowNullPointerExceptionFromCode
    /*
     * Called by managed code to create and deliver a NullPointerException
     */
art_throw_null_pointer_exception_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r0, r9                               @ pass Thread::Current
    mov r1, sp                               @ pass SP
    b   artThrowNullPointerExceptionFromCode @ artThrowNullPointerExceptionFromCode(Thread*, SP)

    .global art_throw_div_zero_from_code
    .extern artThrowDivZeroFromCode
    /*
     * Called by managed code to create and deliver an ArithmeticException
     */
art_throw_div_zero_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r0, r9                  @ pass Thread::Current
    mov r1, sp                  @ pass SP
    b   artThrowDivZeroFromCode @ artThrowDivZeroFromCode(Thread*, SP)

    .global art_throw_array_bounds_from_code
    .extern artThrowArrayBoundsFromCode
    /*
     * Called by managed code to create and deliver an ArrayIndexOutOfBoundsException
     */
art_throw_array_bounds_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r2, r9                      @ pass Thread::Current
    mov r3, sp                      @ pass SP
    b   artThrowArrayBoundsFromCode @ artThrowArrayBoundsFromCode(index, limit, Thread*, SP)

    .global art_throw_stack_overflow_from_code
    .extern artThrowStackOverflowFromCode
art_throw_stack_overflow_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r1, r9                        @ pass Thread::Current
    mov r2, sp                        @ pass SP
    b   artThrowStackOverflowFromCode @ artThrowStackOverflowFromCode(method, Thread*, SP)

    .global art_throw_neg_array_size_from_code
    .extern artThrowNegArraySizeFromCode
art_throw_neg_array_size_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r1, r9                        @ pass Thread::Current
    mov r2, sp                        @ pass SP
    b   artThrowNegArraySizeFromCode  @ artThrowNegArraySizeFromCode(size, Thread*, SP)

    .global art_throw_no_such_method_from_code
    .extern artThrowNoSuchMethodFromCode
art_throw_no_such_method_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r1, r9                        @ pass Thread::Current
    mov r2, sp                        @ pass SP
    b   artThrowNoSuchMethodFromCode  @ artThrowNoSuchMethodFromCode(method_idx, Thread*, SP)

    .global art_throw_verification_error_from_code
    .extern artThrowVerificationErrorFromCode
art_throw_verification_error_from_code:
    SETUP_CALLEE_SAVE_FRAME
    mov r2, r9                            @ pass Thread::Current
    mov r3, sp                            @ pass SP
    b   artThrowVerificationErrorFromCode @ artThrowVerificationErrorFromCode(kind, ref, Thread*, SP)

    .global art_invoke_interface_trampoline
    .extern artFindInterfaceMethodInCacheFromCode
    /*
     * All generated callsites for interface invokes will load arguments as usual - except instead
     * of loading arg0/r0 with the target Method*, arg0/r0 will contain the method_idx.  This
     * wrapper will save arg1-arg3, load the caller's Method*, align the stack and call the helper
     * artFindInterfaceMethodInCacheFromCode(idx, this, method);
     * NOTE: "this" is first visable argument of the target, and so can be found in arg1/r1.
     *
     * artFindInterfaceMethodInCacheFromCode will attempt to locate the target and return a 64-bit
     * result in r0/r1 consisting of the target Method* in r0 and method->code_ in r1.
     *
     * If unsuccessful, artFindInterfaceMethodInCacheFromCode will return NULL/NULL. There will be
     * a pending exception in the thread and we branch to another stub to deliver it.
     *
     * On success this wrapper will restore arguments and *jump* to the target, leaving the lr
     * pointing back to the original caller.
     */
art_invoke_interface_trampoline:
    SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME  @ save callee saves in case allocation triggers GC
    mov    r2, r9                                 @ pass Thread::Current
    mov    r3, sp                                 @ pass SP
    bl     artFindInterfaceMethodInCacheFromCode  @ (method_idx, this, Thread*, SP)
    mov    r12, r1                                @ save r0->code_
    RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
    cmp    r0, #0                                 @ did we find the target?
    bxne   r12                                    @ tail call to target if so
    DELIVER_PENDING_EXCEPTION

    .global art_handle_fill_data_from_code
    .extern artHandleFillArrayDataFromCode
    /*
     * Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on
     * failure.
     */
art_handle_fill_data_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case exception allocation triggers GC
    mov    r2, r9                          @ pass Thread::Current
    mov    r3, sp                          @ pass SP
    bl     artHandleFillArrayDataFromCode  @ (Array* array, const uint16_t* table, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                          @ success?
    moveq  pc, lr                          @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_lock_object_from_code
    .extern artLockObjectFromCode
    /*
     * Entry from managed code that calls artLockObjectFromCode, may block for GC
     */
art_lock_object_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case we block
    mov    r1, r9                     @ pass Thread::Current
    mov    r2, sp                     @ pass SP
    bl     artLockObjectFromCode      @ (Object* obj, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN

    .global art_unlock_object_from_code
    .extern artUnlockObjectFromCode
    /*
     * Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure.
     */
art_unlock_object_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case exception allocation triggers GC
    mov    r1, r9                   @ pass Thread::Current
    mov    r2, sp                   @ pass SP
    bl     artUnlockObjectFromCode  @ (Object* obj, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                   @ success?
    moveq  pc, lr                   @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_check_cast_from_code
    .extern artCheckCastFromCode
    /*
     * Entry from managed code that calls artCheckCastFromCode and delivers exception on failure.
     */
art_check_cast_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME    @ save callee saves in case exception allocation triggers GC
    mov    r2, r9                       @ pass Thread::Current
    mov    r3, sp                       @ pass SP
    bl     artCheckCastFromCode         @ (Class* a, Class* b, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                       @ success?
    moveq  pc, lr                       @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_can_put_array_element_from_code
    .extern artCanPutArrayElementFromCode
    /*
     * Entry from managed code that calls artCanPutArrayElementFromCode and delivers exception on
     * failure.
     */
art_can_put_array_element_from_code:
    cmp    r0, #0                         @ return if element == NULL
    moveq  pc, lr
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME    @ save callee saves in case exception allocation triggers GC
    mov    r2, r9                         @ pass Thread::Current
    mov    r3, sp                         @ pass SP
    bl     artCanPutArrayElementFromCode  @ (Object* element, Class* array_class, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                         @ success?
    moveq  pc, lr                         @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_initialize_static_storage_from_code
    .extern artInitializeStaticStorageFromCode
    /*
     * Entry from managed code when uninitialized static storage, this stub will run the class
     * initializer and deliver the exception on error. On success the static storage base is
     * returned.
     */
art_initialize_static_storage_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME           @ save callee saves in case of GC
    mov    r2, r9                              @ pass Thread::Current
    mov    r3, sp                              @ pass SP
    @ ClassLinker::InitializeStaticStorageFromCode(uint32_t type_idx, Method* referrer, Thread*, SP)
    bl     artInitializeStaticStorageFromCode
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                              @ success if result is non-null
    movne  pc, lr                              @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_find_instance_field_from_code
    .extern artFindInstanceFieldFromCode
    /*
     * Called by managed code to resolve a field of an object
     */
art_find_instance_field_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r2, r9                        @ pass Thread::Current
    mov    r3, sp                        @ pass SP
    bl     artFindInstanceFieldFromCode  @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                        @ success if result is non-null
    movne  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_get32_static_from_code
    .extern artGet32StaticFromCode
    /*
     * Called by managed code to resolve a static field and load a 32-bit primitive value
     */
art_get32_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r2, r9                        @ pass Thread::Current
    mov    r3, sp                        @ pass SP
    bl     artGet32StaticFromCode        @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
    ldr    r12, [r9, #THREAD_EXCEPTION_OFFSET]  @ load Thread::Current()->exception_
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r12, #0                       @ success if no exception is pending
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_get64_static_from_code
    .extern artGet64StaticFromCode
    /*
     * Called by managed code to resolve a static field and load a 64-bit primitive value
     */
art_get64_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r2, r9                        @ pass Thread::Current
    mov    r3, sp                        @ pass SP
    bl     artGet64StaticFromCode        @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
    ldr    r12, [r9, #THREAD_EXCEPTION_OFFSET]  @ load Thread::Current()->exception_
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r12, #0                       @ success if no exception is pending
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_get_obj_static_from_code
    .extern artGetObjStaticFromCode
    /*
     * Called by managed code to resolve a static field and load an object reference
     */
art_get_obj_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r2, r9                        @ pass Thread::Current
    mov    r3, sp                        @ pass SP
    bl     artGetObjStaticFromCode       @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
    ldr    r12, [r9, #THREAD_EXCEPTION_OFFSET]  @ load Thread::Current()->exception_
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r12, #0                       @ success if no exception is pending
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_set32_static_from_code
    .extern artSet32StaticFromCode
    /*
     * Called by managed code to resolve a static field and store a 32-bit primitive value
     */
art_set32_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r3, r9                        @ pass Thread::Current
    str    sp, [sp, #0]                  @ pass SP
    bl     artSet32StaticFromCode        @ (field_idx, referrer, new_val, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                        @ success if result is 0
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_set64_static_from_code
    .extern artSet32StaticFromCode
    /*
     * Called by managed code to resolve a static field and store a 64-bit primitive value
     */
art_set64_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r12, sp                       @ save SP
    sub    sp, #8                        @ grow frame for alignment with stack args
    push   {r9, r12}                     @ pass Thread::Current and SP
    bl     artSet64StaticFromCode        @ (field_idx, referrer, new_val, Thread*, SP)
    add    sp, #16                       @ release out args
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME   @ TODO: we can clearly save an add here
    cmp    r0, #0                        @ success if result is 0
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_set_obj_static_from_code
    .extern artSetObjStaticFromCode
    /*
     * Called by managed code to resolve a static field and store an object reference
     */
art_set_obj_static_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME     @ save callee saves in case of GC
    mov    r3, r9                        @ pass Thread::Current
    str    sp, [sp, #0]                  @ pass SP
    bl     artSetObjStaticFromCode       @ (field_idx, referrer, new_val, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                        @ success if result is 0
    moveq  pc, lr                        @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_alloc_object_from_code
    .extern artAllocObjectFromCode
    /*
     * Called by managed code to allocate an object
     */
art_alloc_object_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case of GC
    mov    r2, r9                     @ pass Thread::Current
    mov    r3, sp                     @ pass SP
    bl     artAllocObjectFromCode     @ (uint32_t type_idx, Method* method, Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                     @ success if result is non-null
    movne  pc, lr                     @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_alloc_array_from_code
    .extern artAllocArrayFromCode
    /*
     * Called by managed code to allocate an array
     */
art_alloc_array_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case of GC
    mov    r3, r9                     @ pass Thread::Current
    str    sp, [sp, #0]               @ pass SP
    @ artAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count, Thread*, SP)
    bl     artAllocArrayFromCode
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                     @ success if result is non-null
    movne  pc, lr                     @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_check_and_alloc_array_from_code
    .extern artCheckAndAllocArrayFromCode
    /*
     * Called by managed code to allocate an array
     */
art_check_and_alloc_array_from_code:
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME  @ save callee saves in case of GC
    mov    r3, r9                     @ pass Thread::Current
    str    sp, [sp, #0]               @ pass SP
    @ artCheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t count, Thread* , SP)
    bl     artCheckAndAllocArrayFromCode
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
    cmp    r0, #0                     @ success if result is non-null
    movne  pc, lr                     @ return on success
    DELIVER_PENDING_EXCEPTION

    .global art_test_suspend
    .extern artTestSuspendFromCode
art_test_suspend:
    ldr    r0, [rSELF, #THREAD_SUSPEND_COUNT_OFFSET]
    mov    rSUSPEND, #SUSPEND_CHECK_INTERVAL  @ reset rSUSPEND to SUSPEND_CHECK_INTERVAL
    cmp    r0, #0                             @ check Thread::Current()->suspend_count_ == 0
    bxeq   rLR                                @ return if suspend_count_ == 0
    mov    r0, rSELF
    SETUP_REF_ONLY_CALLEE_SAVE_FRAME          @ save callee saves for stack crawl
    mov    r1, sp
    bl     artTestSuspendFromCode             @ (Thread*, SP)
    RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN

    .global art_shl_long
art_shl_long:
    /*
     * Long integer shift.  This is different from the generic 32/64-bit
     * binary operations because vAA/vBB are 64-bit but vCC (the shift
     * distance) is 32-bit.  Also, Dalvik requires us to ignore all but the low
     * 6 bits.
     * On entry:
     *   r0: low word
     *   r1: high word
     *   r2: shift count
     */
    /* shl-long vAA, vBB, vCC */
    and     r2, r2, #63                 @ r2<- r2 & 0x3f
    mov     r1, r1, asl r2              @  r1<- r1 << r2
    rsb     r3, r2, #32                 @  r3<- 32 - r2
    orr     r1, r1, r0, lsr r3          @  r1<- r1 | (r0 << (32-r2))
    subs    ip, r2, #32                 @  ip<- r2 - 32
    movpl   r1, r0, asl ip              @  if r2 >= 32, r1<- r0 << (r2-32)
    mov     r0, r0, asl r2              @  r0<- r0 << r2
    bx      lr

    .balign 4
    .global art_shr_long
art_shr_long:
    /*
     * Long integer shift.  This is different from the generic 32/64-bit
     * binary operations because vAA/vBB are 64-bit but vCC (the shift
     * distance) is 32-bit.  Also, Dalvik requires us to ignore all but the low
     * 6 bits.
     * On entry:
     *   r0: low word
     *   r1: high word
     *   r2: shift count
     */
    /* shr-long vAA, vBB, vCC */
    and     r2, r2, #63                 @ r0<- r0 & 0x3f
    mov     r0, r0, lsr r2              @  r0<- r2 >> r2
    rsb     r3, r2, #32                 @  r3<- 32 - r2
    orr     r0, r0, r1, asl r3          @  r0<- r0 | (r1 << (32-r2))
    subs    ip, r2, #32                 @  ip<- r2 - 32
    movpl   r0, r1, asr ip              @  if r2 >= 32, r0<-r1 >> (r2-32)
    mov     r1, r1, asr r2              @  r1<- r1 >> r2
    bx      lr

    .balign 4
    .global art_ushr_long
art_ushr_long:
    /*
     * Long integer shift.  This is different from the generic 32/64-bit
     * binary operations because vAA/vBB are 64-bit but vCC (the shift
     * distance) is 32-bit.  Also, Dalvik requires us to ignore all but the low
     * 6 bits.
     * On entry:
     *   r0: low word
     *   r1: high word
     *   r2: shift count
     */
    /* ushr-long vAA, vBB, vCC */
    and     r2, r2, #63                 @ r0<- r0 & 0x3f
    mov     r0, r0, lsr r2              @  r0<- r2 >> r2
    rsb     r3, r2, #32                 @  r3<- 32 - r2
    orr     r0, r0, r1, asl r3          @  r0<- r0 | (r1 << (32-r2))
    subs    ip, r2, #32                 @  ip<- r2 - 32
    movpl   r0, r1, lsr ip              @  if r2 >= 32, r0<-r1 >>> (r2-32)
    mov     r1, r1, lsr r2              @  r1<- r1 >>> r2
    bx      lr

#endif

#if defined(__i386__)

    .global art_deliver_exception_from_code
    .extern artDeliverExceptionFromCode
    /*
     * Called by managed code, saves callee saves and then calls artThrowException
     * that will place a mock Method* at the bottom of the stack.
     * EAX holds the exception.
     */
art_deliver_exception_from_code:
    // Create frame
    pushl %edi  // Save callee saves
    pushl %esi
    pushl %ebp
    pushl %ebx
    pushl $0
    pushl $0
    pushl $0   // Will be clobbered to be Method*
    mov %esp, %ecx
    // Outgoing argument set up
    pushl $0  // Alignment padding
    pushl %ecx                        // pass SP
    pushl %fs:THREAD_SELF_OFFSET      // pass fs:offsetof(Thread,self_)
    pushl %eax                        // pass Throwable*
    call artDeliverExceptionFromCode  // artDeliverExceptionFromCode(Throwable*, Thread*, SP)
    int3

#endif