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android / platform / art / 796d630 / . / runtime / arch / arm / quick_entrypoints_arm.S
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/*
* 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"
#include "arch/quick_alloc_entrypoints.S"
/* Deliver the given exception */
.extern artDeliverExceptionFromCode
/* Deliver an exception pending on a thread */
.extern artDeliverPendingException
/*
* Macro to spill the GPRs.
*/
.macro SPILL_ALL_CALLEE_SAVE_GPRS
push {r4-r11, lr} @ 9 words (36 bytes) of callee saves.
.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
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveAll)
*/
.macro SETUP_SAVE_ALL_CALLEE_SAVE_FRAME rTemp1, rTemp2
SPILL_ALL_CALLEE_SAVE_GPRS @ 9 words (36 bytes) of callee saves.
vpush {s16-s31} @ 16 words (64 bytes) of floats.
.cfi_adjust_cfa_offset 64
sub sp, #12 @ 3 words of space, bottom word will hold Method*
.cfi_adjust_cfa_offset 12
RUNTIME_CURRENT1 \rTemp1, \rTemp2 @ Load Runtime::Current into rTemp1.
ldr \rTemp1, [\rTemp1, #RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET] @ rTemp1 is kSaveAll Method*.
str \rTemp1, [sp, #0] @ Place Method* at bottom of stack.
str sp, [r9, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 36 + 64 + 12)
#error "SAVE_ALL_CALLEE_SAVE_FRAME(ARM) size not as expected."
#endif
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kRefsOnly).
*/
.macro SETUP_REFS_ONLY_CALLEE_SAVE_FRAME rTemp1, rTemp2
push {r5-r8, r10-r11, lr} @ 7 words of callee saves
.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*
.cfi_adjust_cfa_offset 4
RUNTIME_CURRENT2 \rTemp1, \rTemp2 @ Load Runtime::Current into rTemp1.
ldr \rTemp1, [\rTemp1, #RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET] @ rTemp1 is kRefsOnly Method*.
str \rTemp1, [sp, #0] @ Place Method* at bottom of stack.
str sp, [r9, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 28 + 4)
#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM) size not as expected."
#endif
.endm
.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
add sp, #4 @ bottom word holds Method*
.cfi_adjust_cfa_offset -4
pop {r5-r8, r10-r11, lr} @ 7 words of callee saves
.cfi_restore r5
.cfi_restore r6
.cfi_restore r7
.cfi_restore r8
.cfi_restore r10
.cfi_restore r11
.cfi_restore lr
.cfi_adjust_cfa_offset -28
.endm
.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
bx lr @ return
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kRefsAndArgs).
*/
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_REGISTERS_ONLY
push {r1-r3, r5-r8, r10-r11, lr} @ 10 words of callee saves and args.
.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
vpush {s0-s15} @ 16 words of float args.
.cfi_adjust_cfa_offset 64
sub sp, #8 @ 2 words of space, bottom word will hold Method*
.cfi_adjust_cfa_offset 8
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 40 + 64 + 8)
#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(ARM) size not as expected."
#endif
.endm
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME rTemp1, rTemp2
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_REGISTERS_ONLY
RUNTIME_CURRENT3 \rTemp1, \rTemp2 @ Load Runtime::Current into rTemp1.
@ rTemp1 is kRefsAndArgs Method*.
ldr \rTemp1, [\rTemp1, #RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET]
str \rTemp1, [sp, #0] @ Place Method* at bottom of stack.
str sp, [r9, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
.endm
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_R0
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_REGISTERS_ONLY
str r0, [sp, #0] @ Store ArtMethod* to bottom of stack.
str sp, [r9, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
.endm
.macro RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME
add sp, #8 @ rewind sp
.cfi_adjust_cfa_offset -8
vpop {s0-s15}
.cfi_adjust_cfa_offset -64
pop {r1-r3, r5-r8, r10-r11, lr} @ 10 words of callee saves
.cfi_restore r1
.cfi_restore r2
.cfi_restore r3
.cfi_restore r5
.cfi_restore r6
.cfi_restore r7
.cfi_restore r8
.cfi_restore r10
.cfi_restore r11
.cfi_restore lr
.cfi_adjust_cfa_offset -40
.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 r0, r1 @ save callee saves for throw
mov r0, r9 @ pass Thread::Current
b artDeliverPendingExceptionFromCode @ artDeliverPendingExceptionFromCode(Thread*)
.endm
.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME r0, r1 // save all registers as basis for long jump context
mov r0, r9 @ pass Thread::Current
b \cxx_name @ \cxx_name(Thread*)
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 r1, r2 // save all registers as basis for long jump context
mov r1, r9 @ pass Thread::Current
b \cxx_name @ \cxx_name(Thread*)
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 r2, r3 // save all registers as basis for long jump context
mov r2, r9 @ pass Thread::Current
b \cxx_name @ \cxx_name(Thread*)
END \c_name
.endm
.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg
ldr \reg, [r9, #THREAD_EXCEPTION_OFFSET] // Get exception field.
cbnz \reg, 1f
bx lr
1:
DELIVER_PENDING_EXCEPTION
.endm
.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
RETURN_OR_DELIVER_PENDING_EXCEPTION_REG r1
.endm
.macro RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
.endm
.macro RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
RETURN_IF_RESULT_IS_NON_ZERO
DELIVER_PENDING_EXCEPTION
.endm
// Macros taking opportunity of code similarities for downcalls with referrer for non-wide fields.
.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2 @ save callee saves in case of GC
ldr r1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
mov r2, r9 @ pass Thread::Current
bl \entrypoint @ (uint32_t field_idx, const Method* referrer, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case of GC
ldr r2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
mov r3, r9 @ pass Thread::Current
bl \entrypoint @ (field_idx, Object*, referrer, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r3, r12 @ save callee saves in case of GC
ldr r3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
str r9, [sp, #-16]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 16
bl \entrypoint @ (field_idx, Object*, new_val, referrer, Thread*)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME @ TODO: we can clearly save an add here
\return
END \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, 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_BODY cxx_name
.extern \cxx_name
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case allocation triggers GC
mov r2, r9 @ pass Thread::Current
mov r3, sp
bl \cxx_name @ (method_idx, this, Thread*, SP)
mov r12, r1 @ save Method*->code_
RESTORE_REFS_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
.endm
.macro INVOKE_TRAMPOLINE c_name, cxx_name
ENTRY \c_name
INVOKE_TRAMPOLINE_BODY \cxx_name
END \c_name
.endm
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 internal.
* 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_in_float
* [sp + 8] = core register argument array
* [sp + 12] = fp register argument array
* +-------------------------+
* | uint32_t* fp_reg_args |
* | uint32_t* core_reg_args |
* | result_in_float | <- Caller frame
* | Jvalue* result |
* +-------------------------+
* | lr |
* | r11 |
* | r9 |
* | r4 | <- r11
* +-------------------------+
* | uint32_t out[n-1] |
* | : : | Outs
* | uint32_t out[0] |
* | StackRef<ArtMethod> | <- SP value=null
* +-------------------------+
*/
ENTRY art_quick_invoke_stub_internal
SPILL_ALL_CALLEE_SAVE_GPRS @ spill regs (9)
mov r11, sp @ save the stack pointer
.cfi_def_cfa_register r11
mov r9, r3 @ move managed thread pointer into r9
add r4, r2, #4 @ create space for method pointer in frame
sub r4, sp, r4 @ reserve & align *stack* to 16 bytes: native calling
and r4, #0xFFFFFFF0 @ convention only aligns to 8B, so we have to ensure ART
mov sp, r4 @ 16B alignment ourselves.
mov r4, r0 @ save method*
add r0, sp, #4 @ pass stack pointer + method ptr as dest for memcpy
bl memcpy @ memcpy (dest, src, bytes)
mov ip, #0 @ set ip to 0
str ip, [sp] @ store null for method* at bottom of frame
ldr ip, [r11, #48] @ load fp register argument array pointer
vldm ip, {s0-s15} @ copy s0 - s15
ldr ip, [r11, #44] @ load core register argument array pointer
mov r0, r4 @ restore method*
add ip, ip, #4 @ skip r0
ldm ip, {r1-r3} @ copy r1 - r3
#ifdef ARM_R4_SUSPEND_FLAG
mov r4, #SUSPEND_CHECK_INTERVAL @ reset r4 to suspend check interval
#endif
ldr ip, [r0, #ART_METHOD_QUICK_CODE_OFFSET_32] @ get pointer to the code
blx ip @ call the method
mov sp, r11 @ restore the stack pointer
.cfi_def_cfa_register sp
ldr r4, [sp, #40] @ load result_is_float
ldr r9, [sp, #36] @ load the result pointer
cmp r4, #0
ite eq
strdeq r0, [r9] @ store r0/r1 into result pointer
vstrne d0, [r9] @ store s0-s1/d0 into result pointer
pop {r4, r5, r6, r7, r8, r9, r10, r11, pc} @ restore spill regs
END art_quick_invoke_stub_internal
/*
* On stack replacement stub.
* On entry:
* r0 = stack to copy
* r1 = size of stack
* r2 = pc to call
* r3 = JValue* result
* [sp] = shorty
* [sp + 4] = thread
*/
ENTRY art_quick_osr_stub
SPILL_ALL_CALLEE_SAVE_GPRS @ Spill regs (9)
mov r11, sp @ Save the stack pointer
mov r10, r1 @ Save size of stack
ldr r9, [r11, #40] @ Move managed thread pointer into r9
mov r8, r2 @ Save the pc to call
sub r7, sp, #12 @ Reserve space for stack pointer,
@ JValue* result, and ArtMethod* slot.
and r7, #0xFFFFFFF0 @ Align stack pointer
mov sp, r7 @ Update stack pointer
str r11, [sp, #4] @ Save old stack pointer
str r3, [sp, #8] @ Save JValue* result
mov ip, #0
str ip, [sp] @ Store null for ArtMethod* at bottom of frame
sub sp, sp, r1 @ Reserve space for callee stack
mov r2, r1
mov r1, r0
mov r0, sp
bl memcpy @ memcpy (dest r0, src r1, bytes r2)
bl .Losr_entry @ Call the method
ldr r10, [sp, #8] @ Restore JValue* result
ldr sp, [sp, #4] @ Restore saved stack pointer
ldr r4, [sp, #36] @ load shorty
ldrb r4, [r4, #0] @ load return type
cmp r4, #68 @ Test if result type char == 'D'.
beq .Losr_fp_result
cmp r4, #70 @ Test if result type char == 'F'.
beq .Losr_fp_result
strd r0, [r10] @ Store r0/r1 into result pointer
b .Losr_exit
.Losr_fp_result:
vstr d0, [r10] @ Store s0-s1/d0 into result pointer
.Losr_exit:
pop {r4, r5, r6, r7, r8, r9, r10, r11, pc}
.Losr_entry:
sub r10, r10, #4
str lr, [sp, r10] @ Store link register per the compiler ABI
bx r8
END art_quick_osr_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)
ldr r14, [r0, #56] @ (LR from gprs_ 56=4*14)
add r0, r0, #12 @ increment r0 to skip gprs_[0..2] 12=4*3
ldm r0, {r3-r13} @ load remaining gprs from argument gprs_
ldr r0, [r0, #-12] @ load r0 value
mov r1, #0 @ clear result register r1
bx r2 @ do long jump
END art_quick_do_long_jump
/*
* Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on
* failure.
*/
TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
/*
* Entry from managed code that calls artLockObjectFromCode, may block for GC. r0 holds the
* possibly null object to lock.
*/
.extern artLockObjectFromCode
ENTRY art_quick_lock_object
cbz r0, .Lslow_lock
.Lretry_lock:
ldr r2, [r9, #THREAD_ID_OFFSET]
ldrex r1, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
mov r3, r1
and r3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED @ zero the read barrier bits
cbnz r3, .Lnot_unlocked @ already thin locked
@ unlocked case - r1: original lock word that's zero except for the read barrier bits.
orr r2, r1, r2 @ r2 holds thread id with count of 0 with preserved read barrier bits
strex r3, r2, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
cbnz r3, .Llock_strex_fail @ store failed, retry
dmb ish @ full (LoadLoad|LoadStore) memory barrier
bx lr
.Lnot_unlocked: @ r1: original lock word, r2: thread_id with count of 0 and zero read barrier bits
lsr r3, r1, LOCK_WORD_STATE_SHIFT
cbnz r3, .Lslow_lock @ if either of the top two bits are set, go slow path
eor r2, r1, r2 @ lock_word.ThreadId() ^ self->ThreadId()
uxth r2, r2 @ zero top 16 bits
cbnz r2, .Lslow_lock @ lock word and self thread id's match -> recursive lock
@ else contention, go to slow path
mov r3, r1 @ copy the lock word to check count overflow.
and r3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED @ zero the read barrier bits.
add r2, r3, #LOCK_WORD_THIN_LOCK_COUNT_ONE @ increment count in lock word placing in r2 to check overflow
lsr r3, r2, LOCK_WORD_READ_BARRIER_STATE_SHIFT @ if either of the upper two bits (28-29) are set, we overflowed.
cbnz r3, .Lslow_lock @ if we overflow the count go slow path
add r2, r1, #LOCK_WORD_THIN_LOCK_COUNT_ONE @ increment count for real
strex r3, r2, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET] @ strex necessary for read barrier bits
cbnz r3, .Llock_strex_fail @ strex failed, retry
bx lr
.Llock_strex_fail:
b .Lretry_lock @ retry
.Lslow_lock:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2 @ save callee saves in case we block
mov r1, r9 @ pass Thread::Current
bl artLockObjectFromCode @ (Object* obj, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_lock_object
/*
* Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure.
* r0 holds the possibly null object to lock.
*/
.extern artUnlockObjectFromCode
ENTRY art_quick_unlock_object
cbz r0, .Lslow_unlock
.Lretry_unlock:
#ifndef USE_READ_BARRIER
ldr r1, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
#else
ldrex r1, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET] @ Need to use atomic instructions for read barrier
#endif
lsr r2, r1, #LOCK_WORD_STATE_SHIFT
cbnz r2, .Lslow_unlock @ if either of the top two bits are set, go slow path
ldr r2, [r9, #THREAD_ID_OFFSET]
mov r3, r1 @ copy lock word to check thread id equality
and r3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED @ zero the read barrier bits
eor r3, r3, r2 @ lock_word.ThreadId() ^ self->ThreadId()
uxth r3, r3 @ zero top 16 bits
cbnz r3, .Lslow_unlock @ do lock word and self thread id's match?
mov r3, r1 @ copy lock word to detect transition to unlocked
and r3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED @ zero the read barrier bits
cmp r3, #LOCK_WORD_THIN_LOCK_COUNT_ONE
bpl .Lrecursive_thin_unlock
@ transition to unlocked
mov r3, r1
and r3, #LOCK_WORD_READ_BARRIER_STATE_MASK @ r3: zero except for the preserved read barrier bits
dmb ish @ full (LoadStore|StoreStore) memory barrier
#ifndef USE_READ_BARRIER
str r3, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
#else
strex r2, r3, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET] @ strex necessary for read barrier bits
cbnz r2, .Lunlock_strex_fail @ store failed, retry
#endif
bx lr
.Lrecursive_thin_unlock: @ r1: original lock word
sub r1, r1, #LOCK_WORD_THIN_LOCK_COUNT_ONE @ decrement count
#ifndef USE_READ_BARRIER
str r1, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
#else
strex r2, r1, [r0, #MIRROR_OBJECT_LOCK_WORD_OFFSET] @ strex necessary for read barrier bits
cbnz r2, .Lunlock_strex_fail @ store failed, retry
#endif
bx lr
.Lunlock_strex_fail:
b .Lretry_unlock @ retry
.Lslow_unlock:
@ save callee saves in case exception allocation triggers GC
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2
mov r1, r9 @ pass Thread::Current
bl artUnlockObjectFromCode @ (Object* obj, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_unlock_object
/*
* Entry from managed code that calls artIsAssignableFromCode and on failure calls
* artThrowClassCastException.
*/
.extern artThrowClassCastException
ENTRY art_quick_check_cast
push {r0-r1, lr} @ save arguments, link register and pad
.cfi_adjust_cfa_offset 12
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset lr, 8
sub sp, #4
.cfi_adjust_cfa_offset 4
bl artIsAssignableFromCode
cbz r0, .Lthrow_class_cast_exception
add sp, #4
.cfi_adjust_cfa_offset -4
pop {r0-r1, pc}
.cfi_adjust_cfa_offset 4 @ Reset unwind info so following code unwinds.
.Lthrow_class_cast_exception:
add sp, #4
.cfi_adjust_cfa_offset -4
pop {r0-r1, lr}
.cfi_adjust_cfa_offset -12
.cfi_restore r0
.cfi_restore r1
.cfi_restore lr
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME r2, r3 // save all registers as basis for long jump context
mov r2, r9 @ pass Thread::Current
b artThrowClassCastException @ (Class*, Class*, Thread*)
bkpt
END art_quick_check_cast
// Restore rReg's value from [sp, #offset] if rReg is not the same as rExclude.
.macro POP_REG_NE rReg, offset, rExclude
.ifnc \rReg, \rExclude
ldr \rReg, [sp, #\offset] @ restore rReg
.cfi_restore \rReg
.endif
.endm
/*
* Macro to insert read barrier, only used in art_quick_aput_obj.
* rObj and rDest are registers, offset is a defined literal such as MIRROR_OBJECT_CLASS_OFFSET.
* TODO: When read barrier has a fast path, add heap unpoisoning support for the fast path.
*/
.macro READ_BARRIER rDest, rObj, offset
#ifdef USE_READ_BARRIER
push {r0-r3, ip, lr} @ 6 words for saved registers (used in art_quick_aput_obj)
.cfi_adjust_cfa_offset 24
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset r2, 8
.cfi_rel_offset r3, 12
.cfi_rel_offset ip, 16
.cfi_rel_offset lr, 20
sub sp, #8 @ push padding
.cfi_adjust_cfa_offset 8
@ mov r0, \rRef @ pass ref in r0 (no-op for now since parameter ref is unused)
.ifnc \rObj, r1
mov r1, \rObj @ pass rObj
.endif
mov r2, #\offset @ pass offset
bl artReadBarrierSlow @ artReadBarrierSlow(ref, rObj, offset)
@ No need to unpoison return value in r0, artReadBarrierSlow() would do the unpoisoning.
.ifnc \rDest, r0
mov \rDest, r0 @ save return value in rDest
.endif
add sp, #8 @ pop padding
.cfi_adjust_cfa_offset -8
POP_REG_NE r0, 0, \rDest @ conditionally restore saved registers
POP_REG_NE r1, 4, \rDest
POP_REG_NE r2, 8, \rDest
POP_REG_NE r3, 12, \rDest
POP_REG_NE ip, 16, \rDest
add sp, #20
.cfi_adjust_cfa_offset -20
pop {lr} @ restore lr
.cfi_adjust_cfa_offset -4
.cfi_restore lr
#else
ldr \rDest, [\rObj, #\offset]
UNPOISON_HEAP_REF \rDest
#endif // USE_READ_BARRIER
.endm
/*
* Entry from managed code for array put operations of objects where the value being stored
* needs to be checked for compatibility.
* r0 = array, r1 = index, r2 = value
*/
ENTRY art_quick_aput_obj_with_null_and_bound_check
tst r0, r0
bne art_quick_aput_obj_with_bound_check
b art_quick_throw_null_pointer_exception
END art_quick_aput_obj_with_null_and_bound_check
.hidden art_quick_aput_obj_with_bound_check
ENTRY art_quick_aput_obj_with_bound_check
ldr r3, [r0, #MIRROR_ARRAY_LENGTH_OFFSET]
cmp r3, r1
bhi art_quick_aput_obj
mov r0, r1
mov r1, r3
b art_quick_throw_array_bounds
END art_quick_aput_obj_with_bound_check
#ifdef USE_READ_BARRIER
.extern artReadBarrierSlow
#endif
.hidden art_quick_aput_obj
ENTRY art_quick_aput_obj
#ifdef USE_READ_BARRIER
@ The offset to .Ldo_aput_null is too large to use cbz due to expansion from READ_BARRIER macro.
tst r2, r2
beq .Ldo_aput_null
#else
cbz r2, .Ldo_aput_null
#endif // USE_READ_BARRIER
READ_BARRIER r3, r0, MIRROR_OBJECT_CLASS_OFFSET
READ_BARRIER ip, r2, MIRROR_OBJECT_CLASS_OFFSET
READ_BARRIER r3, r3, MIRROR_CLASS_COMPONENT_TYPE_OFFSET
cmp r3, ip @ value's type == array's component type - trivial assignability
bne .Lcheck_assignability
.Ldo_aput:
add r3, r0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
POISON_HEAP_REF r2
str r2, [r3, r1, lsl #2]
ldr r3, [r9, #THREAD_CARD_TABLE_OFFSET]
lsr r0, r0, #7
strb r3, [r3, r0]
blx lr
.Ldo_aput_null:
add r3, r0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
str r2, [r3, r1, lsl #2]
blx lr
.Lcheck_assignability:
push {r0-r2, lr} @ save arguments
.cfi_adjust_cfa_offset 16
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset r2, 8
.cfi_rel_offset lr, 12
mov r1, ip
mov r0, r3
bl artIsAssignableFromCode
cbz r0, .Lthrow_array_store_exception
pop {r0-r2, lr}
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore lr
.cfi_adjust_cfa_offset -16
add r3, r0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
POISON_HEAP_REF r2
str r2, [r3, r1, lsl #2]
ldr r3, [r9, #THREAD_CARD_TABLE_OFFSET]
lsr r0, r0, #7
strb r3, [r3, r0]
blx lr
.Lthrow_array_store_exception:
pop {r0-r2, lr}
/* No need to repeat restore cfi directives, the ones above apply here. */
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME r3, ip
mov r1, r2
mov r2, r9 @ pass Thread::Current
b artThrowArrayStoreException @ (Class*, Class*, Thread*)
bkpt @ unreached
END art_quick_aput_obj
// Macro to facilitate adding new allocation entrypoints.
.macro ONE_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2 @ save callee saves in case of GC
mov r1, r9 @ pass Thread::Current
bl \entrypoint @ (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro TWO_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
bl \entrypoint @ (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new array allocation entrypoints.
.macro THREE_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r3, r12 @ save callee saves in case of GC
mov r3, r9 @ pass Thread::Current
@ (uint32_t type_idx, Method* method, int32_t component_count, Thread*)
bl \entrypoint
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro FOUR_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
sub sp, #12 @ alignment padding
.cfi_adjust_cfa_offset 12
push {r3} @ Save r3 as is it used as a temp register in the
.cfi_adjust_cfa_offset 4 @ expansion of the SETUP_REFS_ONLY_CALLEE_SAVE_FRAME
.cfi_rel_offset r3, 0 @ macro below, which clobbers its arguments.
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r3, r12 @ save callee saves in case of GC
ldr r3, [sp, 32] @ restore r3
.cfi_restore r3
str r9, [sp, #-16]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 16
bl \entrypoint
add sp, #16 @ strip the extra frame
.cfi_adjust_cfa_offset -16
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
add sp, #16 @ pop r3 + padding
.cfi_adjust_cfa_offset -16
\return
END \name
.endm
ONE_ARG_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
ONE_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
ONE_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
/*
* Called by managed code to resolve a static field and load a non-wide value.
*/
ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
/*
* Called by managed code to resolve a static field and load a 64-bit primitive value.
*/
.extern artGet64StaticFromCode
ENTRY art_quick_get64_static
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case of GC
ldr r1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
mov r2, r9 @ pass Thread::Current
bl artGet64StaticFromCode @ (uint32_t field_idx, const Method* referrer, Thread*)
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REFS_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 an instance field and load a non-wide value.
*/
TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
/*
* Called by managed code to resolve an instance field and load a 64-bit primitive value.
*/
.extern artGet64InstanceFromCode
ENTRY art_quick_get64_instance
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case of GC
ldr r2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
mov r3, r9 @ pass Thread::Current
bl artGet64InstanceFromCode @ (field_idx, Object*, referrer, Thread*)
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_REFS_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 a static field and store a non-wide value.
*/
TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
/*
* Called by managed code to resolve a static field and store a 64-bit primitive value.
* On entry r0 holds field index, r2:r3 hold new_val
*/
.extern artSet64StaticFromCode
ENTRY art_quick_set64_static
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r12 @ save callee saves in case of GC
@ r2:r3 contain the wide argument
ldr r1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
str r9, [sp, #-16]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 16
bl artSet64StaticFromCode @ (field_idx, referrer, new_val, Thread*)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REFS_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 an instance field and store a non-wide value.
*/
THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
/*
* Called by managed code to resolve an instance field and store a 64-bit primitive value.
*/
.extern artSet64InstanceFromCode
ENTRY art_quick_set64_instance
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r12, lr @ save callee saves in case of GC
@ r2:r3 contain the wide argument
ldr r12, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] @ pass referrer
str r9, [sp, #-12]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 12
str r12, [sp, #-4]! @ expand the frame and pass the referrer
.cfi_adjust_cfa_offset 4
bl artSet64InstanceFromCode @ (field_idx, Object*, new_val, Method* referrer, Thread*)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_REFS_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
/*
* 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 string index. The fast
* path check for hit in strings cache has already been performed.
*/
ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
// Generate the allocation entrypoints for each allocator.
GENERATE_ALLOC_ENTRYPOINTS_FOR_EACH_ALLOCATOR
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_rosalloc, RosAlloc).
ENTRY art_quick_alloc_object_rosalloc
// Fast path rosalloc allocation.
// r0: type_idx/return value, r1: ArtMethod*, r9: Thread::Current
// r2, r3, r12: free.
ldr r2, [r1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_32] // Load dex cache resolved types array
// Load the class (r2)
ldr r2, [r2, r0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
cbz r2, .Lart_quick_alloc_object_rosalloc_slow_path // Check null class
// Check class status.
ldr r3, [r2, #MIRROR_CLASS_STATUS_OFFSET]
cmp r3, #MIRROR_CLASS_STATUS_INITIALIZED
bne .Lart_quick_alloc_object_rosalloc_slow_path
// Add a fake dependence from the
// following access flag and size
// loads to the status load.
// This is to prevent those loads
// from being reordered above the
// status load and reading wrong
// values (an alternative is to use
// a load-acquire for the status).
eor r3, r3, r3
add r2, r2, r3
// Check access flags has
// kAccClassIsFinalizable
ldr r3, [r2, #MIRROR_CLASS_ACCESS_FLAGS_OFFSET]
tst r3, #ACCESS_FLAGS_CLASS_IS_FINALIZABLE
bne .Lart_quick_alloc_object_rosalloc_slow_path
ldr r3, [r9, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET] // Check if the thread local
// allocation stack has room.
// TODO: consider using ldrd.
ldr r12, [r9, #THREAD_LOCAL_ALLOC_STACK_END_OFFSET]
cmp r3, r12
bhs .Lart_quick_alloc_object_rosalloc_slow_path
ldr r3, [r2, #MIRROR_CLASS_OBJECT_SIZE_OFFSET] // Load the object size (r3)
cmp r3, #ROSALLOC_MAX_THREAD_LOCAL_BRACKET_SIZE // Check if the size is for a thread
// local allocation
bhs .Lart_quick_alloc_object_rosalloc_slow_path
// Compute the rosalloc bracket index
// from the size.
// Align up the size by the rosalloc
// bracket quantum size and divide
// by the quantum size and subtract
// by 1. This code is a shorter but
// equivalent version.
sub r3, r3, #1
lsr r3, r3, #ROSALLOC_BRACKET_QUANTUM_SIZE_SHIFT
// Load the rosalloc run (r12)
add r12, r9, r3, lsl #POINTER_SIZE_SHIFT
ldr r12, [r12, #THREAD_ROSALLOC_RUNS_OFFSET]
// Load the free list head (r3). This
// will be the return val.
ldr r3, [r12, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_HEAD_OFFSET)]
cbz r3, .Lart_quick_alloc_object_rosalloc_slow_path
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber r0 and r1.
ldr r1, [r3, #ROSALLOC_SLOT_NEXT_OFFSET] // Load the next pointer of the head
// and update the list head with the
// next pointer.
str r1, [r12, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_HEAD_OFFSET)]
// Store the class pointer in the
// header. This also overwrites the
// next pointer. The offsets are
// asserted to match.
#if ROSALLOC_SLOT_NEXT_OFFSET != MIRROR_OBJECT_CLASS_OFFSET
#error "Class pointer needs to overwrite next pointer."
#endif
POISON_HEAP_REF r2
str r2, [r3, #MIRROR_OBJECT_CLASS_OFFSET]
// Push the new object onto the thread
// local allocation stack and
// increment the thread local
// allocation stack top.
ldr r1, [r9, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET]
str r3, [r1], #COMPRESSED_REFERENCE_SIZE // (Increment r1 as a side effect.)
str r1, [r9, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET]
// Decrement the size of the free list
ldr r1, [r12, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_SIZE_OFFSET)]
sub r1, #1
// TODO: consider combining this store
// and the list head store above using
// strd.
str r1, [r12, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_SIZE_OFFSET)]
// Fence. This is "ish" not "ishst" so
// that the code after this allocation
// site will see the right values in
// the fields of the class.
// Alternatively we could use "ishst"
// if we use load-acquire for the
// class status load.)
dmb ish
mov r0, r3 // Set the return value and return.
bx lr
.Lart_quick_alloc_object_rosalloc_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ save callee saves in case of GC
mov r2, r9 @ pass Thread::Current
bl artAllocObjectFromCodeRosAlloc @ (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_rosalloc
// The common fast path code for art_quick_alloc_object_tlab and art_quick_alloc_object_region_tlab.
//
// r0: type_idx/return value, r1: ArtMethod*, r2: class, r9: Thread::Current, r3, r12: free.
// Need to preserve r0 and r1 to the slow path.
.macro ALLOC_OBJECT_TLAB_FAST_PATH slowPathLabel
cbz r2, \slowPathLabel // Check null class
// Check class status.
ldr r3, [r2, #MIRROR_CLASS_STATUS_OFFSET]
cmp r3, #MIRROR_CLASS_STATUS_INITIALIZED
bne \slowPathLabel
// Add a fake dependence from the
// following access flag and size
// loads to the status load.
// This is to prevent those loads
// from being reordered above the
// status load and reading wrong
// values (an alternative is to use
// a load-acquire for the status).
eor r3, r3, r3
add r2, r2, r3
// Check access flags has
// kAccClassIsFinalizable.
ldr r3, [r2, #MIRROR_CLASS_ACCESS_FLAGS_OFFSET]
tst r3, #ACCESS_FLAGS_CLASS_IS_FINALIZABLE
bne \slowPathLabel
// Load thread_local_pos (r12) and
// thread_local_end (r3) with ldrd.
// Check constraints for ldrd.
#if !((THREAD_LOCAL_POS_OFFSET + 4 == THREAD_LOCAL_END_OFFSET) && (THREAD_LOCAL_POS_OFFSET % 8 == 0))
#error "Thread::thread_local_pos/end must be consecutive and are 8 byte aligned for performance"
#endif
ldrd r12, r3, [r9, #THREAD_LOCAL_POS_OFFSET]
sub r12, r3, r12 // Compute the remaining buf size.
ldr r3, [r2, #MIRROR_CLASS_OBJECT_SIZE_OFFSET] // Load the object size (r3).
cmp r3, r12 // Check if it fits. OK to do this
// before rounding up the object size
// assuming the buf size alignment.
bhi \slowPathLabel
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber r0 and r1.
// Round up the object size by the
// object alignment. (addr + 7) & ~7.
add r3, r3, #OBJECT_ALIGNMENT_MASK
and r3, r3, #OBJECT_ALIGNMENT_MASK_TOGGLED
// Reload old thread_local_pos (r0)
// for the return value.
ldr r0, [r9, #THREAD_LOCAL_POS_OFFSET]
add r1, r0, r3
str r1, [r9, #THREAD_LOCAL_POS_OFFSET] // Store new thread_local_pos.
ldr r1, [r9, #THREAD_LOCAL_OBJECTS_OFFSET] // Increment thread_local_objects.
add r1, r1, #1
str r1, [r9, #THREAD_LOCAL_OBJECTS_OFFSET]
POISON_HEAP_REF r2
str r2, [r0, #MIRROR_OBJECT_CLASS_OFFSET] // Store the class pointer.
// Fence. This is "ish" not "ishst" so
// that the code after this allocation
// site will see the right values in
// the fields of the class.
// Alternatively we could use "ishst"
// if we use load-acquire for the
// class status load.)
dmb ish
bx lr
.endm
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_tlab, TLAB).
ENTRY art_quick_alloc_object_tlab
// Fast path tlab allocation.
// r0: type_idx/return value, r1: ArtMethod*, r9: Thread::Current
// r2, r3, r12: free.
#if defined(USE_READ_BARRIER)
mvn r0, #0 // Read barrier not supported here.
bx lr // Return -1.
#endif
ldr r2, [r1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_32] // Load dex cache resolved types array
// Load the class (r2)
ldr r2, [r2, r0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
ALLOC_OBJECT_TLAB_FAST_PATH .Lart_quick_alloc_object_tlab_slow_path
.Lart_quick_alloc_object_tlab_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 // Save callee saves in case of GC.
mov r2, r9 // Pass Thread::Current.
bl artAllocObjectFromCodeTLAB // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_tlab
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_region_tlab, RegionTLAB)
ENTRY art_quick_alloc_object_region_tlab
// Fast path tlab allocation.
// r0: type_idx/return value, r1: ArtMethod*, r9: Thread::Current, r2, r3, r12: free.
#if !defined(USE_READ_BARRIER)
eor r0, r0, r0 // Read barrier must be enabled here.
sub r0, r0, #1 // Return -1.
bx lr
#endif
ldr r2, [r1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_32] // Load dex cache resolved types array
// Load the class (r2)
ldr r2, [r2, r0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
// Read barrier for class load.
ldr r3, [r9, #THREAD_IS_GC_MARKING_OFFSET]
cbnz r3, .Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path
.Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path_exit:
ALLOC_OBJECT_TLAB_FAST_PATH .Lart_quick_alloc_object_region_tlab_slow_path
.Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path:
// The read barrier slow path. Mark
// the class.
push {r0, r1, r3, lr} // Save registers. r3 is pushed only
// to align sp by 16 bytes.
mov r0, r2 // Pass the class as the first param.
bl artReadBarrierMark
mov r2, r0 // Get the (marked) class back.
pop {r0, r1, r3, lr}
b .Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path_exit
.Lart_quick_alloc_object_region_tlab_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 // Save callee saves in case of GC.
mov r2, r9 // Pass Thread::Current.
bl artAllocObjectFromCodeRegionTLAB // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_region_tlab
/*
* Called by managed code when the value in rSUSPEND has been decremented to 0.
*/
.extern artTestSuspendFromCode
ENTRY art_quick_test_suspend
#ifdef ARM_R4_SUSPEND_FLAG
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:
#endif
mov r0, rSELF
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2 @ save callee saves for GC stack crawl
@ TODO: save FPRs to enable access in the debugger?
bl artTestSuspendFromCode @ (Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
END art_quick_test_suspend
ENTRY art_quick_implicit_suspend
mov r0, rSELF
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r1, r2 @ save callee saves for stack crawl
bl artTestSuspendFromCode @ (Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
END art_quick_implicit_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_R0
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_
// Tear down the callee-save frame. Skip arg registers.
add sp, #(FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE - FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
.cfi_adjust_cfa_offset -(FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE - FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
cbnz r2, 1f @ success if no exception is pending
vmov d0, r0, r1 @ store into fpr, for when it's a fpr return...
bx lr @ return on success
1:
DELIVER_PENDING_EXCEPTION
END art_quick_proxy_invoke_handler
/*
* Called to resolve an imt conflict.
* r0 is the conflict ArtMethod.
* r12 is a hidden argument that holds the target interface method's dex method index.
*
* Note that this stub writes to r0, r4, and r12.
*/
ENTRY art_quick_imt_conflict_trampoline
ldr r4, [sp, #0] // Load referrer
ldr r4, [r4, #ART_METHOD_DEX_CACHE_METHODS_OFFSET_32] // Load dex cache methods array
ldr r12, [r4, r12, lsl #POINTER_SIZE_SHIFT] // Load interface method
ldr r0, [r0, #ART_METHOD_JNI_OFFSET_32] // Load ImtConflictTable
ldr r4, [r0] // Load first entry in ImtConflictTable.
.Limt_table_iterate:
cmp r4, r12
// Branch if found. Benchmarks have shown doing a branch here is better.
beq .Limt_table_found
// If the entry is null, the interface method is not in the ImtConflictTable.
cbz r4, .Lconflict_trampoline
// Iterate over the entries of the ImtConflictTable.
ldr r4, [r0, #(2 * __SIZEOF_POINTER__)]!
b .Limt_table_iterate
.Limt_table_found:
// We successuflly hit an entry in the table. Load the target method
// and jump to it.
ldr r0, [r0, #__SIZEOF_POINTER__]
ldr pc, [r0, #ART_METHOD_QUICK_CODE_OFFSET_32]
.Lconflict_trampoline:
// Call the runtime stub to populate the ImtConflictTable and jump to the
// resolved method.
INVOKE_TRAMPOLINE_BODY artInvokeInterfaceTrampoline
END art_quick_imt_conflict_trampoline
.extern artQuickResolutionTrampoline
ENTRY art_quick_resolution_trampoline
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME r2, r3
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
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME
bx r12 @ tail-call into actual code
1:
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_resolution_trampoline
/*
* Called to do a generic JNI down-call
*/
ENTRY art_quick_generic_jni_trampoline
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_R0
// Save rSELF
mov r11, rSELF
// Save SP , so we can have static CFI info. r10 is saved in ref_and_args.
mov r10, sp
.cfi_def_cfa_register r10
sub sp, sp, #5120
// prepare for artQuickGenericJniTrampoline call
// (Thread*, SP)
// r0 r1 <= C calling convention
// rSELF r10 <= where they are
mov r0, rSELF // Thread*
mov r1, r10
blx artQuickGenericJniTrampoline // (Thread*, sp)
// The C call will have registered the complete save-frame on success.
// The result of the call is:
// r0: pointer to native code, 0 on error.
// r1: pointer to the bottom of the used area of the alloca, can restore stack till there.
// Check for error = 0.
cbz r0, .Lexception_in_native
// Release part of the alloca.
mov sp, r1
// Save the code pointer
mov r12, r0
// Load parameters from frame into registers.
pop {r0-r3}
// Softfloat.
// TODO: Change to hardfloat when supported.
blx r12 // native call.
// result sign extension is handled in C code
// prepare for artQuickGenericJniEndTrampoline call
// (Thread*, result, result_f)
// r0 r2,r3 stack <= C calling convention
// r11 r0,r1 r0,r1 <= where they are
sub sp, sp, #8 // Stack alignment.
push {r0-r1}
mov r3, r1
mov r2, r0
mov r0, r11
blx artQuickGenericJniEndTrampoline
// Restore self pointer.
mov r9, r11
// Pending exceptions possible.
ldr r2, [r9, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
cbnz r2, .Lexception_in_native
// Tear down the alloca.
mov sp, r10
.cfi_def_cfa_register sp
// Tear down the callee-save frame. Skip arg registers.
add sp, #FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE-FRAME_SIZE_REFS_ONLY_CALLEE_SAVE
.cfi_adjust_cfa_offset -(FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE-FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
// store into fpr, for when it's a fpr return...
vmov d0, r0, r1
bx lr // ret
// Undo the unwinding information from above since it doesn't apply below.
.cfi_def_cfa_register r10
.cfi_adjust_cfa_offset FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE-FRAME_SIZE_REFS_ONLY_CALLEE_SAVE
.Lexception_in_native:
ldr sp, [r9, #THREAD_TOP_QUICK_FRAME_OFFSET]
.cfi_def_cfa_register sp
# This will create a new save-all frame, required by the runtime.
DELIVER_PENDING_EXCEPTION
END art_quick_generic_jni_trampoline
.extern artQuickToInterpreterBridge
ENTRY art_quick_to_interpreter_bridge
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME r1, r2
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_
// Tear down the callee-save frame. Skip arg registers.
add sp, #(FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE - FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
.cfi_adjust_cfa_offset -(FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE - FRAME_SIZE_REFS_ONLY_CALLEE_SAVE)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
cbnz r2, 1f @ success if no exception is pending
vmov d0, r0, r1 @ store into fpr, for when it's a fpr return...
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
@ Make stack crawlable and clobber r2 and r3 (post saving)
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME r2, r3
@ preserve r0 (not normally an arg) knowing there is a spare slot in kRefsAndArgs.
str r0, [sp, #4]
mov r2, r9 @ pass Thread::Current
mov r3, lr @ pass LR
blx artInstrumentationMethodEntryFromCode @ (Method*, Object*, Thread*, LR)
mov r12, r0 @ r12 holds reference to code
ldr r0, [sp, #4] @ restore r0
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME
blx r12 @ call method with lr set to art_quick_instrumentation_exit
@ Deliberate fall-through into art_quick_instrumentation_exit.
.type art_quick_instrumentation_exit, #function
.global art_quick_instrumentation_exit
art_quick_instrumentation_exit:
mov lr, #0 @ link register is to here, so clobber with 0 for later checks
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME r2, r3 @ set up frame knowing r2 and r3 must be dead on exit
mov r12, sp @ remember bottom of caller's frame
push {r0-r1} @ save return value
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
vpush {d0} @ save fp return value
.cfi_adjust_cfa_offset 8
sub sp, #8 @ space for return value argument. Note: AAPCS stack alignment is 8B, no
@ need to align by 16.
.cfi_adjust_cfa_offset 8
vstr d0, [sp] @ d0 -> [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
vpop {d0} @ restore fp return value
.cfi_adjust_cfa_offset -8
pop {r0, r1} @ restore return value
.cfi_adjust_cfa_offset -8
.cfi_restore r0
.cfi_restore r1
add sp, #32 @ remove callee save frame
.cfi_adjust_cfa_offset -32
bx r2 @ return
END art_quick_instrumentation_entry
/*
* 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 r0, r1
mov r0, r9 @ Set up args.
blx artDeoptimize @ artDeoptimize(Thread*)
END art_quick_deoptimize
/*
* Compiled code has requested that we deoptimize into the interpreter. The deoptimization
* will long jump to the interpreter bridge.
*/
.extern artDeoptimizeFromCompiledCode
ENTRY art_quick_deoptimize_from_compiled_code
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME r0, r1
mov r0, r9 @ Set up args.
blx artDeoptimizeFromCompiledCode @ artDeoptimizeFromCompiledCode(Thread*)
END art_quick_deoptimize_from_compiled_code
/*
* 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}
.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
.cfi_restore r9
.cfi_restore r10
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
.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, #MIRROR_STRING_COUNT_OFFSET]
add r0, #MIRROR_STRING_VALUE_OFFSET
/* Clamp start to [0..count] */
cmp r2, #0
it lt
movlt r2, #0
cmp r2, r3
it gt
movgt r2, r3
/* 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 .Lindexof_remainder
.Lindexof_loop4:
ldrh r3, [r0, #2]!
ldrh r4, [r0, #2]!
ldrh r10, [r0, #2]!
ldrh r11, [r0, #2]!
cmp r3, r1
beq .Lmatch_0
cmp r4, r1
beq .Lmatch_1
cmp r10, r1
beq .Lmatch_2
cmp r11, r1
beq .Lmatch_3
subs r2, #4
bge .Lindexof_loop4
.Lindexof_remainder:
adds r2, #4
beq .Lindexof_nomatch
.Lindexof_loop1:
ldrh r3, [r0, #2]!
cmp r3, r1
beq .Lmatch_3
subs r2, #1
bne .Lindexof_loop1
.Lindexof_nomatch:
mov r0, #-1
pop {r4, r10-r11, pc}
.Lmatch_0:
sub r0, #6
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
.Lmatch_1:
sub r0, #4
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
.Lmatch_2:
sub r0, #2
sub r0, r12
asr r0, r0, #1
pop {r4, r10-r11, pc}
.Lmatch_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
.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 r7, [r2, #MIRROR_STRING_COUNT_OFFSET]
ldr r10, [r1, #MIRROR_STRING_COUNT_OFFSET]
add r2, #MIRROR_STRING_VALUE_OFFSET
add r1, #MIRROR_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
/*
* Note: data pointers point to previous element so we can use pre-index
* mode with base writeback.
*/
subs r2, #2 @ offset to contents[-1]
subs r1, #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 .Ldo_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 .Ldone
cmp r10, #28
bgt .Ldo_memcmp16
subs r10, #3
blt .Ldo_remainder
.Lloopback_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 .Ldone
subs r10, #3
bge .Lloopback_triple
.Ldo_remainder:
adds r10, #3
beq .Lreturn_diff
.Lloopback_single:
ldrh r3, [r2, #2]!
ldrh r4, [r1, #2]!
subs r0, r3, r4
bne .Ldone
subs r10, #1
bne .Lloopback_single
.Lreturn_diff:
mov r0, r11
pop {r4, r7-r12, pc}
.Ldo_remainder2:
adds r10, #2
bne .Lloopback_single
mov r0, r11
pop {r4, r7-r12, pc}
/* Long string case */
.Ldo_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
.Ldone:
pop {r4, r7-r12, pc}
END art_quick_string_compareto
/* Assembly routines used to handle ABI differences. */
/* double fmod(double a, double b) */
.extern fmod
ENTRY art_quick_fmod
push {lr}
.cfi_adjust_cfa_offset 4
.cfi_rel_offset lr, 0
sub sp, #4
.cfi_adjust_cfa_offset 4
vmov r0, r1, d0
vmov r2, r3, d1
bl fmod
vmov d0, r0, r1
add sp, #4
.cfi_adjust_cfa_offset -4
pop {pc}
END art_quick_fmod
/* float fmodf(float a, float b) */
.extern fmodf
ENTRY art_quick_fmodf
push {lr}
.cfi_adjust_cfa_offset 4
.cfi_rel_offset lr, 0
sub sp, #4
.cfi_adjust_cfa_offset 4
vmov r0, r1, d0
bl fmodf
vmov s0, r0
add sp, #4
.cfi_adjust_cfa_offset -4
pop {pc}
END art_quick_fmod
/* int64_t art_d2l(double d) */
.extern art_d2l
ENTRY art_quick_d2l
vmov r0, r1, d0
b art_d2l
END art_quick_d2l
/* int64_t art_f2l(float f) */
.extern art_f2l
ENTRY art_quick_f2l
vmov r0, s0
b art_f2l
END art_quick_f2l
/* float art_l2f(int64_t l) */
.extern art_l2f
ENTRY art_quick_l2f
push {lr}
.cfi_adjust_cfa_offset 4
.cfi_rel_offset lr, 0
sub sp, #4
.cfi_adjust_cfa_offset 4
bl art_l2f
vmov s0, r0
add sp, #4
.cfi_adjust_cfa_offset -4
pop {pc}
END art_quick_l2f