/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "asm_support_arm.S"
/* 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_SAVE_ALL_CALLEE_SAVE_FRAME
push {r4-r11, lr} @ 9 words of callee saves
.save {r4-r11, lr}
.cfi_adjust_cfa_offset 36
.cfi_rel_offset r4, 0
.cfi_rel_offset r5, 4
.cfi_rel_offset r6, 8
.cfi_rel_offset r7, 12
.cfi_rel_offset r8, 16
.cfi_rel_offset r9, 20
.cfi_rel_offset r10, 24
.cfi_rel_offset r11, 28
.cfi_rel_offset lr, 32
vpush {s0-s31}
.pad #128
.cfi_adjust_cfa_offset 128
sub sp, #12 @ 3 words of space, bottom word will hold Method*
.pad #12
.cfi_adjust_cfa_offset 12
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kRefsOnly). Restoration assumes non-moving GC.
*/
.macro SETUP_REF_ONLY_CALLEE_SAVE_FRAME
push {r5-r8, r10-r11, lr} @ 7 words of callee saves
.save {r5-r8, r10-r11, lr}
.cfi_adjust_cfa_offset 28
.cfi_rel_offset r5, 0
.cfi_rel_offset r6, 4
.cfi_rel_offset r7, 8
.cfi_rel_offset r8, 12
.cfi_rel_offset r10, 16
.cfi_rel_offset r11, 20
.cfi_rel_offset lr, 24
sub sp, #4 @ bottom word will hold Method*
.pad #4
.cfi_adjust_cfa_offset 4
.endm
.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
ldr lr, [sp, #28] @ restore lr for return
add sp, #32 @ unwind stack
.cfi_adjust_cfa_offset -32
.endm
.macro RESTORE_REF_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
ldr lr, [sp, #28] @ restore lr for return
add sp, #32 @ unwind stack
.cfi_adjust_cfa_offset -32
bx lr @ return
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kRefsAndArgs). Restoration assumes non-moving GC.
*/
.macro SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
push {r1-r3, r5-r8, r10-r11, lr} @ 10 words of callee saves
.save {r1-r3, r5-r8, r10-r11, lr}
.cfi_adjust_cfa_offset 40
.cfi_rel_offset r1, 0
.cfi_rel_offset r2, 4
.cfi_rel_offset r3, 8
.cfi_rel_offset r5, 12
.cfi_rel_offset r6, 16
.cfi_rel_offset r7, 20
.cfi_rel_offset r8, 24
.cfi_rel_offset r10, 28
.cfi_rel_offset r11, 32
.cfi_rel_offset lr, 36
sub sp, #8 @ 2 words of space, bottom word will hold Method*
.pad #8
.cfi_adjust_cfa_offset 8
.endm
.macro RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
ldr r1, [sp, #8] @ restore non-callee save r1
ldrd r2, [sp, #12] @ restore non-callee saves r2-r3
ldr lr, [sp, #44] @ restore lr
add sp, #48 @ rewind sp
.cfi_adjust_cfa_offset -48
.endm
.macro RETURN_IF_RESULT_IS_ZERO
cbnz r0, 1f @ result non-zero branch over
bx lr @ return
1:
.endm
.macro RETURN_IF_RESULT_IS_NON_ZERO
cbz r0, 1f @ result zero branch over
bx lr @ return
1:
.endm
/*
* Macro that set calls through to artDeliverPendingExceptionFromCode, where the pending
* exception is Thread::Current()->exception_
*/
.macro DELIVER_PENDING_EXCEPTION
.fnend
.fnstart
SETUP_SAVE_ALL_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
.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context
mov r0, r9 @ pass Thread::Current
mov r1, sp @ pass SP
b \cxx_name @ \cxx_name(Thread*, SP)
END \c_name
.endm
.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context
mov r1, r9 @ pass Thread::Current
mov r2, sp @ pass SP
b \cxx_name @ \cxx_name(Thread*, SP)
END \c_name
.endm
.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
b \cxx_name @ \cxx_name(Thread*, SP)
END \c_name
.endm
/*
* Called by managed code, saves callee saves and then calls artThrowException
* that will place a mock Method* at the bottom of the stack. Arg1 holds the exception.
*/
ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode
/*
* Called by managed code to create and deliver a NullPointerException.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode
/*
* Called by managed code to create and deliver an ArithmeticException.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode
/*
* Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds
* index, arg2 holds limit.
*/
TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode
/*
* Called by managed code to create and deliver a StackOverflowError.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode
/*
* Called by managed code to create and deliver a NoSuchMethodError.
*/
ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode
/*
* All generated callsites for interface invokes and invocation slow paths 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 appropriate C helper.
* NOTE: "this" is first visible argument of the target, and so can be found in arg1/r1.
*
* The helper 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, the helper will return NULL/NULL. There will bea 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.
*/
.macro INVOKE_TRAMPOLINE c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME @ save callee saves in case allocation triggers GC
ldr r2, [sp, #48] @ pass caller Method*
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
bl \cxx_name @ (method_idx, this, caller, Thread*, SP)
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
mov r12, r1 @ save Method*->code_
RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
cbz r0, 1f @ did we find the target? if not go to exception delivery
bx r12 @ tail call to target
1:
DELIVER_PENDING_EXCEPTION
END \c_name
.endm
INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline, artInvokeInterfaceTrampoline
INVOKE_TRAMPOLINE art_quick_invoke_interface_trampoline_with_access_check, artInvokeInterfaceTrampolineWithAccessCheck
INVOKE_TRAMPOLINE art_quick_invoke_static_trampoline_with_access_check, artInvokeStaticTrampolineWithAccessCheck
INVOKE_TRAMPOLINE art_quick_invoke_direct_trampoline_with_access_check, artInvokeDirectTrampolineWithAccessCheck
INVOKE_TRAMPOLINE art_quick_invoke_super_trampoline_with_access_check, artInvokeSuperTrampolineWithAccessCheck
INVOKE_TRAMPOLINE art_quick_invoke_virtual_trampoline_with_access_check, artInvokeVirtualTrampolineWithAccessCheck
/*
* Quick invocation stub.
* On entry:
* r0 = method pointer
* r1 = argument array or NULL for no argument methods
* r2 = size of argument array in bytes
* r3 = (managed) thread pointer
* [sp] = JValue* result
* [sp + 4] = result type char
*/
ENTRY art_quick_invoke_stub
push {r0, r4, r5, r9, r11, lr} @ spill regs
.save {r0, r4, r5, r9, r11, lr}
.pad #24
.cfi_adjust_cfa_offset 24
.cfi_rel_offset r0, 0
.cfi_rel_offset r4, 4
.cfi_rel_offset r5, 8
.cfi_rel_offset r9, 12
.cfi_rel_offset r11, 16
.cfi_rel_offset lr, 20
mov r11, sp @ save the stack pointer
.cfi_def_cfa_register r11
mov r9, r3 @ move managed thread pointer into r9
mov r4, #SUSPEND_CHECK_INTERVAL @ reset r4 to suspend check interval
add r5, r2, #16 @ create space for method pointer in frame
and r5, #0xFFFFFFF0 @ align frame size to 16 bytes
sub sp, r5 @ reserve stack space for argument array
add r0, sp, #4 @ pass stack pointer + method ptr as dest for memcpy
bl memcpy @ memcpy (dest, src, bytes)
ldr r0, [r11] @ restore method*
ldr r1, [sp, #4] @ copy arg value for r1
ldr r2, [sp, #8] @ copy arg value for r2
ldr r3, [sp, #12] @ copy arg value for r3
mov ip, #0 @ set ip to 0
str ip, [sp] @ store NULL for method* at bottom of frame
ldr ip, [r0, #METHOD_CODE_OFFSET] @ get pointer to the code
blx ip @ call the method
mov sp, r11 @ restore the stack pointer
ldr ip, [sp, #24] @ load the result pointer
strd r0, [ip] @ store r0/r1 into result pointer
pop {r0, r4, r5, r9, r11, lr} @ restore spill regs
.cfi_adjust_cfa_offset -24
bx lr
END art_quick_invoke_stub
/*
* On entry r0 is uint32_t* gprs_ and r1 is uint32_t* fprs_
*/
ARM_ENTRY art_quick_do_long_jump
vldm r1, {s0-s31} @ load all fprs from argument fprs_
ldr r2, [r0, #60] @ r2 = r15 (PC from gprs_ 60=4*15)
add r0, r0, #12 @ increment r0 to skip gprs_[0..2] 12=4*3
ldm r0, {r3-r14} @ load remaining gprs from argument gprs_
mov r0, #0 @ clear result registers r0 and r1
mov r1, #0
bx r2 @ do long jump
END art_quick_do_long_jump
/*
* Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on
* failure.
*/
.extern artHandleFillArrayDataFromCode
ENTRY art_quick_handle_fill_data
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*, const DexFile::Payload*, Thread*, SP)
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_handle_fill_data
/*
* Entry from managed code that calls artLockObjectFromCode, may block for GC.
*/
.extern artLockObjectFromCode
ENTRY art_quick_lock_object
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
END art_quick_lock_object
/*
* Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure.
*/
.extern artUnlockObjectFromCode
ENTRY art_quick_unlock_object
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
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_unlock_object
/*
* Entry from managed code that calls artCheckCastFromCode and delivers exception on failure.
*/
.extern artCheckCastFromCode
ENTRY art_quick_check_cast
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
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_check_cast
/*
* Entry from managed code that calls artCanPutArrayElementFromCode and delivers exception on
* failure.
*/
.extern artCanPutArrayElementFromCode
ENTRY art_quick_can_put_array_element
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
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_can_put_array_element
/*
* 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.
*/
.extern artInitializeStaticStorageFromCode
ENTRY art_quick_initialize_static_storage
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
@ artInitializeStaticStorageFromCode(uint32_t type_idx, Method* referrer, Thread*, SP)
bl artInitializeStaticStorageFromCode
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_initialize_static_storage
/*
* Entry from managed code when dex cache misses for a type_idx
*/
.extern artInitializeTypeFromCode
ENTRY art_quick_initialize_type
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
@ artInitializeTypeFromCode(uint32_t type_idx, Method* referrer, Thread*, SP)
bl artInitializeTypeFromCode
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_initialize_type
/*
* Entry from managed code when type_idx needs to be checked for access and dex cache may also
* miss.
*/
.extern artInitializeTypeAndVerifyAccessFromCode
ENTRY art_quick_initialize_type_and_verify_access
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
@ artInitializeTypeAndVerifyAccessFromCode(uint32_t type_idx, Method* referrer, Thread*, SP)
bl artInitializeTypeAndVerifyAccessFromCode
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_initialize_type_and_verify_access
/*
* Called by managed code to resolve a static field and load a 32-bit primitive value.
*/
.extern artGet32StaticFromCode
ENTRY art_quick_get32_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r1, [sp, #32] @ pass referrer
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
bl artGet32StaticFromCode @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
ldr r1, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r1, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get32_static
/*
* Called by managed code to resolve a static field and load a 64-bit primitive value.
*/
.extern artGet64StaticFromCode
ENTRY art_quick_get64_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r1, [sp, #32] @ pass referrer
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
bl artGet64StaticFromCode @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r2, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get64_static
/*
* Called by managed code to resolve a static field and load an object reference.
*/
.extern artGetObjStaticFromCode
ENTRY art_quick_get_obj_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r1, [sp, #32] @ pass referrer
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
bl artGetObjStaticFromCode @ (uint32_t field_idx, const Method* referrer, Thread*, SP)
ldr r1, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r1, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get_obj_static
/*
* Called by managed code to resolve an instance field and load a 32-bit primitive value.
*/
.extern artGet32InstanceFromCode
ENTRY art_quick_get32_instance
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r2, [sp, #32] @ pass referrer
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
bl artGet32InstanceFromCode @ (field_idx, Object*, referrer, Thread*, SP)
add sp, #16 @ strip the extra frame
ldr r1, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r1, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get32_instance
/*
* Called by managed code to resolve an instance field and load a 64-bit primitive value.
*/
.extern artGet64InstanceFromCode
ENTRY art_quick_get64_instance
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r2, [sp, #32] @ pass referrer
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
bl artGet64InstanceFromCode @ (field_idx, Object*, referrer, Thread*, SP)
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r2, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get64_instance
/*
* Called by managed code to resolve an instance field and load an object reference.
*/
.extern artGetObjInstanceFromCode
ENTRY art_quick_get_obj_instance
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r2, [sp, #32] @ pass referrer
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
bl artGetObjInstanceFromCode @ (field_idx, Object*, referrer, Thread*, SP)
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
ldr r1, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
cbnz r1, 1f @ success if no exception pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_get_obj_instance
/*
* Called by managed code to resolve a static field and store a 32-bit primitive value.
*/
.extern artSet32StaticFromCode
ENTRY art_quick_set32_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r2, [sp, #32] @ pass referrer
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
bl artSet32StaticFromCode @ (field_idx, new_val, referrer, Thread*, SP)
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set32_static
/*
* Called by managed code to resolve a static field and store a 64-bit primitive value.
* On entry r0 holds field index, r1:r2 hold new_val
*/
.extern artSet64StaticFromCode
ENTRY art_quick_set64_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r3, r2 @ pass one half of wide argument
mov r2, r1 @ pass other half of wide argument
ldr r1, [sp, #32] @ pass referrer
mov r12, sp @ save SP
sub sp, #8 @ grow frame for alignment with stack args
.pad #8
.cfi_adjust_cfa_offset 8
push {r9, r12} @ pass Thread::Current and SP
.save {r9, r12}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r9, 0
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
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set64_static
/*
* Called by managed code to resolve a static field and store an object reference.
*/
.extern artSetObjStaticFromCode
ENTRY art_quick_set_obj_static
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r2, [sp, #32] @ pass referrer
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
bl artSetObjStaticFromCode @ (field_idx, new_val, referrer, Thread*, SP)
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set_obj_static
/*
* Called by managed code to resolve an instance field and store a 32-bit primitive value.
*/
.extern artSet32InstanceFromCode
ENTRY art_quick_set32_instance
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r3, [sp, #32] @ pass referrer
mov r12, sp @ save SP
sub sp, #8 @ grow frame for alignment with stack args
.pad #8
.cfi_adjust_cfa_offset 8
push {r9, r12} @ pass Thread::Current and SP
.save {r9, r12}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r9, 0
.cfi_rel_offset r12, 4
bl artSet32InstanceFromCode @ (field_idx, Object*, new_val, referrer, Thread*, SP)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME @ TODO: we can clearly save an add here
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set32_instance
/*
* Called by managed code to resolve an instance field and store a 64-bit primitive value.
*/
.extern artSet32InstanceFromCode
ENTRY art_quick_set64_instance
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
.pad #8
.cfi_adjust_cfa_offset 8
push {r9, r12} @ pass Thread::Current and SP
.save {r9, r12}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r9, 0
bl artSet64InstanceFromCode @ (field_idx, Object*, new_val, Thread*, SP)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME @ TODO: we can clearly save an add here
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set64_instance
/*
* Called by managed code to resolve an instance field and store an object reference.
*/
.extern artSetObjInstanceFromCode
ENTRY art_quick_set_obj_instance
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
ldr r3, [sp, #32] @ pass referrer
mov r12, sp @ save SP
sub sp, #8 @ grow frame for alignment with stack args
.pad #8
.cfi_adjust_cfa_offset 8
push {r9, r12} @ pass Thread::Current and SP
.save {r9, r12}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r9, 0
bl artSetObjInstanceFromCode @ (field_idx, Object*, new_val, referrer, Thread*, SP)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME @ TODO: we can clearly save an add here
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set_obj_instance
/*
* Entry from managed code to resolve a string, this stub will allocate a String and deliver an
* exception on error. On success the String is returned. R0 holds the referring method,
* R1 holds the string index. The fast path check for hit in strings cache has already been
* performed.
*/
.extern artResolveStringFromCode
ENTRY art_quick_resolve_string
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
@ artResolveStringFromCode(Method* referrer, uint32_t string_idx, Thread*, SP)
bl artResolveStringFromCode
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_resolve_string
/*
* Called by managed code to allocate an object
*/
.extern artAllocObjectFromCode
ENTRY art_quick_alloc_object
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
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_alloc_object
/*
* Called by managed code to allocate an object when the caller doesn't know whether it has
* access to the created type.
*/
.extern artAllocObjectFromCodeWithAccessCheck
ENTRY art_quick_alloc_object_with_access_check
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 artAllocObjectFromCodeWithAccessCheck @ (uint32_t type_idx, Method* method, Thread*, SP)
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_alloc_object_with_access_check
/*
* Called by managed code to allocate an array.
*/
.extern artAllocArrayFromCode
ENTRY art_quick_alloc_array
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
@ artAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count, Thread*, SP)
bl artAllocArrayFromCode
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_alloc_array
/*
* Called by managed code to allocate an array when the caller doesn't know whether it has
* access to the created type.
*/
.extern artAllocArrayFromCodeWithAccessCheck
ENTRY art_quick_alloc_array_with_access_check
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
@ artAllocArrayFromCodeWithAccessCheck(type_idx, method, component_count, Thread*, SP)
bl artAllocArrayFromCodeWithAccessCheck
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_alloc_array_with_access_check
/*
* Called by managed code to allocate an array in a special case for FILLED_NEW_ARRAY.
*/
.extern artCheckAndAllocArrayFromCode
ENTRY art_quick_check_and_alloc_array
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
@ artCheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t count, Thread* , SP)
bl artCheckAndAllocArrayFromCode
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_check_and_alloc_array
/*
* Called by managed code to allocate an array in a special case for FILLED_NEW_ARRAY.
*/
.extern artCheckAndAllocArrayFromCodeWithAccessCheck
ENTRY art_quick_check_and_alloc_array_with_access_check
SETUP_REF_ONLY_CALLEE_SAVE_FRAME @ save callee saves in case of GC
mov r3, r9 @ pass Thread::Current
mov r12, sp
str r12, [sp, #-16]! @ expand the frame and pass SP
.pad #16
.cfi_adjust_cfa_offset 16
@ artCheckAndAllocArrayFromCodeWithAccessCheck(type_idx, method, count, Thread* , SP)
bl artCheckAndAllocArrayFromCodeWithAccessCheck
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REF_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_check_and_alloc_array_with_access_check
/*
* Called by managed code when the value in rSUSPEND has been decremented to 0.
*/
.extern artTestSuspendFromCode
ENTRY art_quick_test_suspend
ldrh r0, [rSELF, #THREAD_FLAGS_OFFSET]
mov rSUSPEND, #SUSPEND_CHECK_INTERVAL @ reset rSUSPEND to SUSPEND_CHECK_INTERVAL
cbnz r0, 1f @ check Thread::Current()->suspend_count_ == 0
bx lr @ return if suspend_count_ == 0
1:
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
END art_quick_test_suspend
/*
* Called by managed code that is attempting to call a method on a proxy class. On entry
* r0 holds the proxy method and r1 holds the receiver; r2 and r3 may contain arguments. The
* frame size of the invoked proxy method agrees with a ref and args callee save frame.
*/
.extern artQuickProxyInvokeHandler
ENTRY art_quick_proxy_invoke_handler
SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
str r0, [sp, #0] @ place proxy method at bottom of frame
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
blx artQuickProxyInvokeHandler @ (Method* proxy method, receiver, Thread*, SP)
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
ldr lr, [sp, #44] @ restore lr
add sp, #48 @ pop frame
.cfi_adjust_cfa_offset -48
cbnz r2, 1f @ success if no exception is pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_proxy_invoke_handler
.extern artQuickResolutionTrampoline
ENTRY art_quick_resolution_trampoline
SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
mov r2, r9 @ pass Thread::Current
mov r3, sp @ pass SP
blx artQuickResolutionTrampoline @ (Method* called, receiver, Thread*, SP)
cbz r0, 1f @ is code pointer null? goto exception
mov r12, r0
ldr r0, [sp, #0] @ load resolved method in r0
ldr r1, [sp, #8] @ restore non-callee save r1
ldrd r2, [sp, #12] @ restore non-callee saves r2-r3
ldr lr, [sp, #44] @ restore lr
add sp, #48 @ rewind sp
.cfi_adjust_cfa_offset -48
bx r12 @ tail-call into actual code
1:
RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_resolution_trampoline
.extern artQuickToInterpreterBridge
ENTRY art_quick_to_interpreter_bridge
SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
mov r1, r9 @ pass Thread::Current
mov r2, sp @ pass SP
blx artQuickToInterpreterBridge @ (Method* method, Thread*, SP)
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
ldr lr, [sp, #44] @ restore lr
add sp, #48 @ pop frame
.cfi_adjust_cfa_offset -48
cbnz r2, 1f @ success if no exception is pending
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_to_interpreter_bridge
/*
* Routine that intercepts method calls and returns.
*/
.extern artInstrumentationMethodEntryFromCode
.extern artInstrumentationMethodExitFromCode
ENTRY art_quick_instrumentation_entry
SETUP_REF_AND_ARGS_CALLEE_SAVE_FRAME
str r0, [sp, #4] @ preserve r0
mov r12, sp @ remember sp
str lr, [sp, #-16]! @ expand the frame and pass LR
.pad #16
.cfi_adjust_cfa_offset 16
.cfi_rel_offset lr, 0
mov r2, r9 @ pass Thread::Current
mov r3, r12 @ pass SP
blx artInstrumentationMethodEntryFromCode @ (Method*, Object*, Thread*, SP, LR)
add sp, #16 @ remove out argument and padding from stack
.cfi_adjust_cfa_offset -16
mov r12, r0 @ r12 holds reference to code
ldr r0, [sp, #4] @ restore r0
RESTORE_REF_AND_ARGS_CALLEE_SAVE_FRAME
blx r12 @ call method with lr set to art_quick_instrumentation_exit
END art_quick_instrumentation_entry
.type art_quick_instrumentation_exit, #function
.global art_quick_instrumentation_exit
art_quick_instrumentation_exit:
.cfi_startproc
.fnstart
mov lr, #0 @ link register is to here, so clobber with 0 for later checks
SETUP_REF_ONLY_CALLEE_SAVE_FRAME
mov r12, sp @ remember bottom of caller's frame
push {r0-r1} @ save return value
.save {r0-r1}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
sub sp, #8 @ space for return value argument
.pad #8
.cfi_adjust_cfa_offset 8
strd r0, [sp] @ r0/r1 -> [sp] for fpr_res
mov r2, r0 @ pass return value as gpr_res
mov r3, r1
mov r0, r9 @ pass Thread::Current
mov r1, r12 @ pass SP
blx artInstrumentationMethodExitFromCode @ (Thread*, SP, gpr_res, fpr_res)
add sp, #8
.cfi_adjust_cfa_offset -8
mov r2, r0 @ link register saved by instrumentation
mov lr, r1 @ r1 is holding link register if we're to bounce to deoptimize
pop {r0, r1} @ restore return value
add sp, #32 @ remove callee save frame
.cfi_adjust_cfa_offset -32
bx r2 @ return
END art_quick_instrumentation_exit
/*
* Instrumentation has requested that we deoptimize into the interpreter. The deoptimization
* will long jump to the upcall with a special exception of -1.
*/
.extern artDeoptimize
ENTRY art_quick_deoptimize
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME
mov r0, r9 @ Set up args.
mov r1, sp
blx artDeoptimize @ artDeoptimize(Thread*, SP)
END art_quick_deoptimize
/*
* Signed 64-bit integer multiply.
*
* Consider WXxYZ (r1r0 x r3r2) with a long multiply:
* WX
* x YZ
* --------
* ZW ZX
* YW YX
*
* The low word of the result holds ZX, the high word holds
* (ZW+YX) + (the high overflow from ZX). YW doesn't matter because
* it doesn't fit in the low 64 bits.
*
* Unlike most ARM math operations, multiply instructions have
* restrictions on using the same register more than once (Rd and Rm
* cannot be the same).
*/
/* mul-long vAA, vBB, vCC */
ENTRY art_quick_mul_long
push {r9 - r10}
.save {r9 - r10}
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r9, 0
.cfi_rel_offset r10, 4
mul ip, r2, r1 @ ip<- ZxW
umull r9, r10, r2, r0 @ r9/r10 <- ZxX
mla r2, r0, r3, ip @ r2<- YxX + (ZxW)
add r10, r2, r10 @ r10<- r10 + low(ZxW + (YxX))
mov r0,r9
mov r1,r10
pop {r9 - r10}
.cfi_adjust_cfa_offset -8
bx lr
END art_quick_mul_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 */
ARM_ENTRY art_quick_shl_long @ ARM code as thumb code requires spills
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
END art_quick_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
*/
/* shr-long vAA, vBB, vCC */
ARM_ENTRY art_quick_shr_long @ ARM code as thumb code requires spills
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
END art_quick_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
*/
/* ushr-long vAA, vBB, vCC */
ARM_ENTRY art_quick_ushr_long @ ARM code as thumb code requires spills
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
END art_quick_ushr_long
/*
* String's indexOf.
*
* On entry:
* r0: string object (known non-null)
* r1: char to match (known <= 0xFFFF)
* r2: Starting offset in string data
*/
ENTRY art_quick_indexof
push {r4, r10-r11, lr} @ 4 words of callee saves
.save {r4, r10-r11, lr}
.cfi_adjust_cfa_offset 16
.cfi_rel_offset r4, 0
.cfi_rel_offset r10, 4
.cfi_rel_offset r11, 8
.cfi_rel_offset lr, 12
ldr r3, [r0, #STRING_COUNT_OFFSET]
ldr r12, [r0, #STRING_OFFSET_OFFSET]
ldr r0, [r0, #STRING_VALUE_OFFSET]
/* Clamp start to [0..count] */
cmp r2, #0
it lt
movlt r2, #0
cmp r2, r3
it gt
movgt r2, r3
/* Build a pointer to the start of string data */
add r0, #STRING_DATA_OFFSET
add r0, r0, r12, lsl #1
/* Save a copy in r12 to later compute result */
mov r12, r0
/* Build pointer to start of data to compare and pre-bias */
add r0, r0, r2, lsl #1
sub r0, #2
/* Compute iteration count */
sub r2, r3, r2
/*
* At this point we have:
* r0: start of data to test
* r1: char to compare
* r2: iteration count
* r12: original start of string data
* r3, r4, r10, r11 available for loading string data
*/
subs r2, #4
blt indexof_remainder
indexof_loop4:
ldrh r3, [r0, #2]!
ldrh r4, [r0, #2]!
ldrh r10, [r0, #2]!
ldrh r11, [r0, #2]!
cmp r3, r1
beq match_0
cmp r4, r1
beq match_1
cmp r10, r1
beq match_2
cmp r11, r1
beq match_3
subs r2, #4
bge indexof_loop4
indexof_remainder:
adds r2, #4
beq indexof_nomatch
indexof_loop1:
ldrh r3, [r0, #2]!
cmp r3, r1
beq match_3
subs r2, #1
bne indexof_loop1
indexof_nomatch:
mov r0, #-1
pop {r4, r10-r11, pc}
match_0:
sub r0, #6
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
match_1:
sub r0, #4
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
match_2:
sub r0, #2
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
match_3:
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
END art_quick_indexof
/*
* String's compareTo.
*
* Requires rARG0/rARG1 to have been previously checked for null. Will
* return negative if this's string is < comp, 0 if they are the
* same and positive if >.
*
* On entry:
* r0: this object pointer
* r1: comp object pointer
*
*/
.extern __memcmp16
ENTRY art_quick_string_compareto
mov r2, r0 @ this to r2, opening up r0 for return value
sub r0, r2, r1 @ Same?
cbnz r0,1f
bx lr
1: @ Same strings, return.
push {r4, r7-r12, lr} @ 8 words - keep alignment
.save {r4, r7-r12, lr}
.cfi_adjust_cfa_offset 32
.cfi_rel_offset r4, 0
.cfi_rel_offset r7, 4
.cfi_rel_offset r8, 8
.cfi_rel_offset r9, 12
.cfi_rel_offset r10, 16
.cfi_rel_offset r11, 20
.cfi_rel_offset r12, 24
.cfi_rel_offset lr, 28
ldr r4, [r2, #STRING_OFFSET_OFFSET]
ldr r9, [r1, #STRING_OFFSET_OFFSET]
ldr r7, [r2, #STRING_COUNT_OFFSET]
ldr r10, [r1, #STRING_COUNT_OFFSET]
ldr r2, [r2, #STRING_VALUE_OFFSET]
ldr r1, [r1, #STRING_VALUE_OFFSET]
/*
* At this point, we have:
* value: r2/r1
* offset: r4/r9
* count: r7/r10
* We're going to compute
* r11 <- countDiff
* r10 <- minCount
*/
subs r11, r7, r10
it ls
movls r10, r7
/* Now, build pointers to the string data */
add r2, r2, r4, lsl #1
add r1, r1, r9, lsl #1
/*
* Note: data pointers point to previous element so we can use pre-index
* mode with base writeback.
*/
add r2, #STRING_DATA_OFFSET-2 @ offset to contents[-1]
add r1, #STRING_DATA_OFFSET-2 @ offset to contents[-1]
/*
* At this point we have:
* r2: *this string data
* r1: *comp string data
* r10: iteration count for comparison
* r11: value to return if the first part of the string is equal
* r0: reserved for result
* r3, r4, r7, r8, r9, r12 available for loading string data
*/
subs r10, #2
blt do_remainder2
/*
* Unroll the first two checks so we can quickly catch early mismatch
* on long strings (but preserve incoming alignment)
*/
ldrh r3, [r2, #2]!
ldrh r4, [r1, #2]!
ldrh r7, [r2, #2]!
ldrh r8, [r1, #2]!
subs r0, r3, r4
it eq
subseq r0, r7, r8
bne done
cmp r10, #28
bgt do_memcmp16
subs r10, #3
blt do_remainder
loopback_triple:
ldrh r3, [r2, #2]!
ldrh r4, [r1, #2]!
ldrh r7, [r2, #2]!
ldrh r8, [r1, #2]!
ldrh r9, [r2, #2]!
ldrh r12,[r1, #2]!
subs r0, r3, r4
it eq
subseq r0, r7, r8
it eq
subseq r0, r9, r12
bne done
subs r10, #3
bge loopback_triple
do_remainder:
adds r10, #3
beq returnDiff
loopback_single:
ldrh r3, [r2, #2]!
ldrh r4, [r1, #2]!
subs r0, r3, r4
bne done
subs r10, #1
bne loopback_single
returnDiff:
mov r0, r11
pop {r4, r7-r12, pc}
do_remainder2:
adds r10, #2
bne loopback_single
mov r0, r11
pop {r4, r7-r12, pc}
/* Long string case */
do_memcmp16:
mov r7, r11
add r0, r2, #2
add r1, r1, #2
mov r2, r10
bl __memcmp16
cmp r0, #0
it eq
moveq r0, r7
done:
pop {r4, r7-r12, pc}
END art_quick_string_compareto