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android13/art/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 "interpreter/cfi_asm_support.h"
#include "arch/quick_alloc_entrypoints.S"
/* Deliver the given exception */
.extern artDeliverExceptionFromCode
/* Deliver an exception pending on a thread */
.extern artDeliverPendingException
.macro SETUP_SAVE_REFS_AND_ARGS_FRAME rTemp
SETUP_SAVE_REFS_AND_ARGS_FRAME_REGISTERS_ONLY
LOAD_RUNTIME_INSTANCE \rTemp @ Load Runtime::Current into rTemp.
@ Load kSaveRefsAndArgs Method* into rTemp.
ldr \rTemp, [\rTemp, #RUNTIME_SAVE_REFS_AND_ARGS_METHOD_OFFSET]
str \rTemp, [sp, #0] @ Place Method* at bottom of stack.
str sp, [rSELF, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
.endm
.macro SETUP_SAVE_REFS_AND_ARGS_FRAME_WITH_METHOD_IN_R0
SETUP_SAVE_REFS_AND_ARGS_FRAME_REGISTERS_ONLY
str r0, [sp, #0] @ Store ArtMethod* to bottom of stack.
str sp, [rSELF, #THREAD_TOP_QUICK_FRAME_OFFSET] @ Place sp in Thread::Current()->top_quick_frame.
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveEverything)
* when core registers are already saved.
*/
.macro SETUP_SAVE_EVERYTHING_FRAME_CORE_REGS_SAVED rTemp, runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
@ 14 words of callee saves and args already saved.
vpush {d0-d15} @ 32 words, 2 for each of the 16 saved doubles.
.cfi_adjust_cfa_offset 128
sub sp, #8 @ 2 words of space, alignment padding and Method*
.cfi_adjust_cfa_offset 8
LOAD_RUNTIME_INSTANCE \rTemp @ Load Runtime::Current into rTemp.
@ Load kSaveEverything Method* into rTemp.
ldr \rTemp, [\rTemp, #\runtime_method_offset]
str \rTemp, [sp, #0] @ Place Method* at bottom of stack.
str sp, [rSELF, #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_EVERYTHING != 56 + 128 + 8)
#error "FRAME_SIZE_SAVE_EVERYTHING(ARM) size not as expected."
#endif
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveEverything)
*/
.macro SETUP_SAVE_EVERYTHING_FRAME rTemp, runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
push {r0-r12, lr} @ 14 words of callee saves and args.
.cfi_adjust_cfa_offset 56
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset r2, 8
.cfi_rel_offset r3, 12
.cfi_rel_offset r4, 16
.cfi_rel_offset r5, 20
.cfi_rel_offset r6, 24
.cfi_rel_offset r7, 28
.cfi_rel_offset r8, 32
.cfi_rel_offset r9, 36
.cfi_rel_offset r10, 40
.cfi_rel_offset r11, 44
.cfi_rel_offset ip, 48
.cfi_rel_offset lr, 52
SETUP_SAVE_EVERYTHING_FRAME_CORE_REGS_SAVED \rTemp, \runtime_method_offset
.endm
.macro RESTORE_SAVE_EVERYTHING_FRAME
add sp, #8 @ rewind sp
.cfi_adjust_cfa_offset -8
vpop {d0-d15}
.cfi_adjust_cfa_offset -128
pop {r0-r12, lr} @ 14 words of callee saves
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore r3
.cfi_restore r4
.cfi_restore r5
.cfi_restore r6
.cfi_restore r7
.cfi_restore r8
.cfi_restore r9
.cfi_restore r10
.cfi_restore r11
.cfi_restore r12
.cfi_restore lr
.cfi_adjust_cfa_offset -56
.endm
.macro RESTORE_SAVE_EVERYTHING_FRAME_KEEP_R0
add sp, #8 @ rewind sp
.cfi_adjust_cfa_offset -8
vpop {d0-d15}
.cfi_adjust_cfa_offset -128
add sp, #4 @ skip r0
.cfi_adjust_cfa_offset -4
.cfi_restore r0 @ debugger can no longer restore caller's r0
pop {r1-r12, lr} @ 13 words of callee saves
.cfi_restore r1
.cfi_restore r2
.cfi_restore r3
.cfi_restore r4
.cfi_restore r5
.cfi_restore r6
.cfi_restore r7
.cfi_restore r8
.cfi_restore r9
.cfi_restore r10
.cfi_restore r11
.cfi_restore r12
.cfi_restore lr
.cfi_adjust_cfa_offset -52
.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 NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME r0 @ save all registers as basis for long jump context
mov r0, rSELF @ pass Thread::Current
bl \cxx_name @ \cxx_name(Thread*)
END \c_name
.endm
.macro NO_ARG_RUNTIME_EXCEPTION_SAVE_EVERYTHING c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_EVERYTHING_FRAME r0 @ save all registers as basis for long jump context
mov r0, rSELF @ pass Thread::Current
bl \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_SAVES_FRAME r1 @ save all registers as basis for long jump context
mov r1, rSELF @ pass Thread::Current
bl \cxx_name @ \cxx_name(Thread*)
END \c_name
.endm
.macro TWO_ARG_RUNTIME_EXCEPTION_SAVE_EVERYTHING c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_EVERYTHING_FRAME r2 @ save all registers as basis for long jump context
mov r2, rSELF @ pass Thread::Current
bl \cxx_name @ \cxx_name(Thread*)
END \c_name
.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.
.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r1 @ save callee saves in case of GC
mov r1, rSELF @ pass Thread::Current
bl \entrypoint @ (uint32_t field_idx, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
mov r2, rSELF @ pass Thread::Current
bl \entrypoint @ (field_idx, Object*, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r3 @ save callee saves in case of GC
mov r3, rSELF @ pass Thread::Current
bl \entrypoint @ (field_idx, Object*, new_val, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME @ TODO: we can clearly save an add here
REFRESH_MARKING_REGISTER
\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_SAVE_EVERYTHING art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode
/*
* Call installed by a signal handler to create and deliver a NullPointerException.
*/
.extern art_quick_throw_null_pointer_exception_from_signal
ENTRY art_quick_throw_null_pointer_exception_from_signal
// The fault handler pushes the gc map address, i.e. "return address", to stack
// and passes the fault address in LR. So we need to set up the CFI info accordingly.
.cfi_def_cfa_offset __SIZEOF_POINTER__
.cfi_rel_offset lr, 0
push {r0-r12} @ 13 words of callee saves and args; LR already saved.
.cfi_adjust_cfa_offset 52
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset r2, 8
.cfi_rel_offset r3, 12
.cfi_rel_offset r4, 16
.cfi_rel_offset r5, 20
.cfi_rel_offset r6, 24
.cfi_rel_offset r7, 28
.cfi_rel_offset r8, 32
.cfi_rel_offset r9, 36
.cfi_rel_offset r10, 40
.cfi_rel_offset r11, 44
.cfi_rel_offset ip, 48
@ save all registers as basis for long jump context
SETUP_SAVE_EVERYTHING_FRAME_CORE_REGS_SAVED r1
mov r0, lr @ pass the fault address stored in LR by the fault handler.
mov r1, rSELF @ pass Thread::Current
bl artThrowNullPointerExceptionFromSignal @ (Thread*)
END art_quick_throw_null_pointer_exception_from_signal
/*
* Called by managed code to create and deliver an ArithmeticException.
*/
NO_ARG_RUNTIME_EXCEPTION_SAVE_EVERYTHING 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_SAVE_EVERYTHING art_quick_throw_array_bounds, artThrowArrayBoundsFromCode
/*
* Called by managed code to create and deliver a StringIndexOutOfBoundsException
* as if thrown from a call to String.charAt(). Arg1 holds index, arg2 holds limit.
*/
TWO_ARG_RUNTIME_EXCEPTION_SAVE_EVERYTHING art_quick_throw_string_bounds, artThrowStringBoundsFromCode
/*
* Called by managed code to create and deliver a StackOverflowError.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode
/*
* 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.
*
* Clobbers IP (R12).
*/
.macro INVOKE_TRAMPOLINE_BODY cxx_name
.extern \cxx_name
SETUP_SAVE_REFS_AND_ARGS_FRAME r2 @ save callee saves in case allocation triggers GC
mov r2, rSELF @ pass Thread::Current
mov r3, sp
bl \cxx_name @ (method_idx, this, Thread*, SP)
mov r12, r1 @ save Method*->code_
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
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
REFRESH_MARKING_REGISTER
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)
vpush {s16-s31} @ Spill fp-regs (16)
.cfi_adjust_cfa_offset 64
SAVE_SIZE=(9*4+16*4)
mov r11, sp @ Save the stack pointer
.cfi_def_cfa r11, SAVE_SIZE @ CFA = r11 + SAVE_SIZE
.cfi_remember_state
mov r10, r1 @ Save size of stack
ldr r9, [r11, #(SAVE_SIZE+4)] @ Move managed thread pointer into r9
REFRESH_MARKING_REGISTER
mov r6, 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
// r11 isn't properly spilled in the osr method, so we need use DWARF expression.
// NB: the CFI must be before the call since this is the address gdb will lookup.
// NB: gdb expects that cfa_expression returns the CFA value (not address to it).
.cfi_escape /* CFA = [sp + 4] + SAVE_SIZE */ \
0x0f, 6, /* DW_CFA_def_cfa_expression(len) */ \
0x92, 13, 4, /* DW_OP_bregx(reg,offset) */ \
0x06, /* DW_OP_deref */ \
0x23, SAVE_SIZE /* DW_OP_plus_uconst(val) */
bl .Losr_entry @ Call the method
ldr r10, [sp, #8] @ Restore JValue* result
ldr sp, [sp, #4] @ Restore saved stack pointer
.cfi_def_cfa sp, SAVE_SIZE @ CFA = sp + SAVE_SIZE
strd r0, [r10] @ Store r0/r1 into result pointer
vpop {s16-s31}
.cfi_adjust_cfa_offset -64
pop {r4, r5, r6, r7, r8, r9, r10, r11, pc}
.Losr_entry:
CFI_RESTORE_STATE_AND_DEF_CFA r11, SAVE_SIZE @ CFA = r11 + SAVE_SIZE
sub sp, sp, r10 @ Reserve space for callee stack
sub r10, r10, #4
str lr, [sp, r10] @ Store link register per the compiler ABI
mov r2, r10
mov r1, r0
mov r0, sp
bl memcpy @ memcpy (dest r0, src r1, bytes r2)
bx r6
END art_quick_osr_stub
/*
* On entry r0 is uint32_t* gprs_ and r1 is uint32_t* fprs_.
* Both must reside on the stack, between current SP and target SP.
* The r12 (IP) shall be clobbered rather than retrieved from gprs_.
*/
ARM_ENTRY art_quick_do_long_jump
vldm r1, {s0-s31} @ Load all fprs from argument fprs_.
mov sp, r0 @ Make SP point to gprs_.
@ Do not access fprs_ from now, they may be below SP.
ldm sp, {r0-r11} @ load r0-r11 from gprs_.
ldr r12, [sp, #60] @ Load the value of PC (r15) from gprs_ (60 = 4 * 15) into IP (r12).
ldr lr, [sp, #56] @ Load LR from gprs_, 56 = 4 * 14.
ldr sp, [sp, #52] @ Load SP from gprs_ 52 = 4 * 13.
@ Do not access gprs_ from now, they are below SP.
REFRESH_MARKING_REGISTER
bx r12 @ 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 tries to lock the object in a fast path and
* calls `artLockObjectFromCode()` for the difficult cases, may block for GC.
* r0 holds the possibly null object to lock.
*/
ENTRY art_quick_lock_object
// Note: the slow path is actually the art_quick_lock_object_no_inline (tail call).
LOCK_OBJECT_FAST_PATH r0, r1, r2, r3, .Llock_object_slow, /*can_be_null*/ 1
END art_quick_lock_object
/*
* 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_no_inline
// This is also the slow path for art_quick_lock_object.
// Note that we need a local label as the assembler emits bad instructions
// for CBZ/CBNZ if we try to jump to `art_quick_lock_object_no_inline`.
.Llock_object_slow:
SETUP_SAVE_REFS_ONLY_FRAME r1 @ save callee saves in case we block
mov r1, rSELF @ pass Thread::Current
bl artLockObjectFromCode @ (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_lock_object_no_inline
/*
* Entry from managed code that tries to unlock the object in a fast path and calls
* `artUnlockObjectFromCode()` for the difficult cases and delivers exception on failure.
* r0 holds the possibly null object to unlock.
*/
ENTRY art_quick_unlock_object
// Note: the slow path is actually the art_quick_unlock_object_no_inline (tail call).
UNLOCK_OBJECT_FAST_PATH r0, r1, r2, r3, .Lunlock_object_slow, /*can_be_null*/ 1
END art_quick_unlock_object
/*
* Entry from managed code that calls `artUnlockObjectFromCode()`
* and delivers exception on failure.
* r0 holds the possibly null object to unlock.
*/
.extern artUnlockObjectFromCode
ENTRY art_quick_unlock_object_no_inline
// This is also the slow path for art_quick_unlock_object.
// Note that we need a local label as the assembler emits bad instructions
// for CBZ/CBNZ if we try to jump to `art_quick_unlock_object_no_inline`.
.Lunlock_object_slow:
@ save callee saves in case exception allocation triggers GC
SETUP_SAVE_REFS_ONLY_FRAME r1
mov r1, rSELF @ pass Thread::Current
bl artUnlockObjectFromCode @ (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_unlock_object_no_inline
/*
* Entry from managed code that calls artInstanceOfFromCode and on failure calls
* artThrowClassCastExceptionForObject.
*/
.extern artInstanceOfFromCode
.extern artThrowClassCastExceptionForObject
ENTRY art_quick_check_instance_of
// Type check using the bit string passes null as the target class. In that case just throw.
cbz r1, .Lthrow_class_cast_exception_for_bitstring_check
push {r0-r2, lr} @ save arguments, padding (r2) and link register
.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
bl artInstanceOfFromCode
cbz r0, .Lthrow_class_cast_exception
pop {r0-r2, pc}
.Lthrow_class_cast_exception:
pop {r0-r2, lr}
.cfi_adjust_cfa_offset -16
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore lr
.Lthrow_class_cast_exception_for_bitstring_check:
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME r2 @ save all registers as basis for long jump context
mov r2, rSELF @ pass Thread::Current
bl artThrowClassCastExceptionForObject @ (Object*, Class*, Thread*)
bkpt
END art_quick_check_instance_of
// 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
// Save rReg's value to [sp, #offset].
.macro PUSH_REG rReg, offset
str \rReg, [sp, #\offset] @ save rReg
.cfi_rel_offset \rReg, \offset
.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
#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, [rSELF, #THREAD_CARD_TABLE_OFFSET]
lsr r0, r0, #CARD_TABLE_CARD_SHIFT
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
.cfi_remember_state
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, [rSELF, #THREAD_CARD_TABLE_OFFSET]
lsr r0, r0, #CARD_TABLE_CARD_SHIFT
strb r3, [r3, r0]
blx lr
.Lthrow_array_store_exception:
CFI_RESTORE_STATE_AND_DEF_CFA sp, 16
pop {r0-r2, lr}
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore lr
.cfi_adjust_cfa_offset -16
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME r3
mov r1, r2
mov r2, rSELF @ pass Thread::Current
bl 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_SAVE_REFS_ONLY_FRAME r1 @ save callee saves in case of GC
mov r1, rSELF @ pass Thread::Current
bl \entrypoint @ (uint32_t type_idx, Method* method, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro TWO_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
mov r2, rSELF @ pass Thread::Current
bl \entrypoint @ (uint32_t type_idx, Method* method, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
// Macro to facilitate adding new array allocation entrypoints.
.macro THREE_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r3 @ save callee saves in case of GC
mov r3, rSELF @ pass Thread::Current
@ (uint32_t type_idx, Method* method, int32_t component_count, Thread*)
bl \entrypoint
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro FOUR_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME r12 @ save callee saves in case of GC
str rSELF, [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_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
/*
* Macro for resolution and initialization of indexed DEX file
* constants such as classes and strings.
*/
.macro ONE_ARG_SAVE_EVERYTHING_DOWNCALL name, entrypoint, runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
.extern \entrypoint
ENTRY \name
SETUP_SAVE_EVERYTHING_FRAME r1, \runtime_method_offset @ save everything in case of GC
mov r1, rSELF @ pass Thread::Current
bl \entrypoint @ (uint32_t index, Thread*)
cbz r0, 1f @ If result is null, deliver the OOME.
.cfi_remember_state
RESTORE_SAVE_EVERYTHING_FRAME_KEEP_R0
REFRESH_MARKING_REGISTER
bx lr
CFI_RESTORE_STATE_AND_DEF_CFA sp, FRAME_SIZE_SAVE_EVERYTHING
1:
DELIVER_PENDING_EXCEPTION_FRAME_READY
END \name
.endm
.macro ONE_ARG_SAVE_EVERYTHING_DOWNCALL_FOR_CLINIT name, entrypoint
ONE_ARG_SAVE_EVERYTHING_DOWNCALL \name, \entrypoint, RUNTIME_SAVE_EVERYTHING_FOR_CLINIT_METHOD_OFFSET
.endm
ONE_ARG_SAVE_EVERYTHING_DOWNCALL_FOR_CLINIT art_quick_initialize_static_storage, artInitializeStaticStorageFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL_FOR_CLINIT art_quick_resolve_type, artResolveTypeFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_resolve_type_and_verify_access, artResolveTypeAndVerifyAccessFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_resolve_method_handle, artResolveMethodHandleFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_resolve_method_type, artResolveMethodTypeFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_resolve_string, artResolveStringFromCode
// Note: Functions `art{Get,Set}<Kind>{Static,Instance}FromCompiledCode` are
// defined with a macro in runtime/entrypoints/quick/quick_field_entrypoints.cc.
/*
* Called by managed code to resolve a static field and load a non-wide value.
*/
ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
/*
* Called by managed code to resolve a static field and load a 64-bit primitive value.
*/
.extern artGet64StaticFromCompiledCode
ENTRY art_quick_get64_static
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
mov r1, rSELF @ pass Thread::Current
bl artGet64StaticFromCompiledCode @ (uint32_t field_idx, Thread*)
ldr r2, [rSELF, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
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, artGetByteInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_R1
/*
* Called by managed code to resolve an instance field and load a 64-bit primitive value.
*/
.extern artGet64InstanceFromCompiledCode
ENTRY art_quick_get64_instance
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
mov r2, rSELF @ pass Thread::Current
bl artGet64InstanceFromCompiledCode @ (field_idx, Object*, Thread*)
ldr r2, [rSELF, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
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 value.
*/
TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
/*
* Called by managed code to resolve an instance field and store a non-wide value.
*/
THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCompiledCode, RETURN_IF_RESULT_IS_ZERO_OR_DELIVER
/*
* Called by managed code to resolve an instance field and store a wide value.
*/
.extern artSet64InstanceFromCompiledCode
ENTRY art_quick_set64_instance
SETUP_SAVE_REFS_ONLY_FRAME r12 @ save callee saves in case of GC
@ r2:r3 contain the wide argument
str rSELF, [sp, #-16]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 16
bl artSet64InstanceFromCompiledCode @ (field_idx, Object*, new_val, Thread*)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_SAVE_REFS_ONLY_FRAME @ TODO: we can clearly save an add here
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set64_instance
.extern artSet64StaticFromCompiledCode
ENTRY art_quick_set64_static
SETUP_SAVE_REFS_ONLY_FRAME r12 @ save callee saves in case of GC
@ r2:r3 contain the wide argument
str rSELF, [sp, #-16]! @ expand the frame and pass Thread::Current
.cfi_adjust_cfa_offset 16
bl artSet64StaticFromCompiledCode @ (field_idx, new_val, Thread*)
add sp, #16 @ release out args
.cfi_adjust_cfa_offset -16
RESTORE_SAVE_REFS_ONLY_FRAME @ TODO: we can clearly save an add here
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_ZERO
DELIVER_PENDING_EXCEPTION
END art_quick_set64_static
// Generate the allocation entrypoints for each allocator.
GENERATE_ALLOC_ENTRYPOINTS_FOR_NON_TLAB_ALLOCATORS
// Comment out allocators that have arm specific asm.
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_region_tlab, RegionTLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_region_tlab, RegionTLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED32(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED64(_region_tlab, RegionTLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_BYTES(_region_tlab, RegionTLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_CHARS(_region_tlab, RegionTLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_STRING(_region_tlab, RegionTLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_RESOLVED(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_INITIALIZED(_tlab, TLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT_WITH_ACCESS_CHECK(_tlab, TLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_OBJECT(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED8(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED16(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED32(_tlab, TLAB)
// GENERATE_ALLOC_ENTRYPOINTS_ALLOC_ARRAY_RESOLVED64(_tlab, TLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_BYTES(_tlab, TLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_CHARS(_tlab, TLAB)
GENERATE_ALLOC_ENTRYPOINTS_ALLOC_STRING_FROM_STRING(_tlab, TLAB)
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_RESOLVED_OBJECT(_rosalloc, RosAlloc).
//
// If isInitialized=1 then the compiler assumes the object's class has already been initialized.
// If isInitialized=0 the compiler can only assume it's been at least resolved.
.macro ART_QUICK_ALLOC_OBJECT_ROSALLOC c_name, cxx_name, isInitialized
ENTRY \c_name
// Fast path rosalloc allocation.
// r0: type/return value, rSELF (r9): Thread::Current
// r1, r2, r3, r12: free.
ldr r3, [rSELF, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET] // Check if the thread local
// allocation stack has room.
// TODO: consider using ldrd.
ldr r12, [rSELF, #THREAD_LOCAL_ALLOC_STACK_END_OFFSET]
cmp r3, r12
bhs .Lslow_path\c_name
ldr r3, [r0, #MIRROR_CLASS_OBJECT_SIZE_ALLOC_FAST_PATH_OFFSET] // Load the object size (r3)
cmp r3, #ROSALLOC_MAX_THREAD_LOCAL_BRACKET_SIZE // Check if the size is for a thread
// local allocation.
// If the class is not yet visibly initialized, or it is finalizable,
// the object size will be very large to force the branch below to be taken.
//
// See Class::SetStatus() in class.cc for more details.
bhs .Lslow_path\c_name
// Compute the rosalloc bracket index
// from the size. Since the size is
// already aligned we can combine the
// two shifts together.
add r12, rSELF, r3, lsr #(ROSALLOC_BRACKET_QUANTUM_SIZE_SHIFT - POINTER_SIZE_SHIFT)
// Subtract pointer size since ther
// are no runs for 0 byte allocations
// and the size is already aligned.
// Load the rosalloc run (r12)
ldr r12, [r12, #(THREAD_ROSALLOC_RUNS_OFFSET - __SIZEOF_POINTER__)]
// 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, .Lslow_path\c_name
// "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 r0
str r0, [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, [rSELF, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET]
str r3, [r1], #COMPRESSED_REFERENCE_SIZE // (Increment r1 as a side effect.)
str r1, [rSELF, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET]
// Decrement the size of the free list
// After this "STR" the object is published to the thread local allocation stack,
// and it will be observable from a runtime internal (eg. Heap::VisitObjects) point of view.
// It is not yet visible to the running (user) compiled code until after the return.
//
// To avoid the memory barrier prior to the "STR", a trick is employed, by differentiating
// the state of the allocation stack slot. It can be a pointer to one of:
// 0) Null entry, because the stack was bumped but the new pointer wasn't written yet.
// (The stack initial state is "null" pointers).
// 1) A partially valid object, with an invalid class pointer to the next free rosalloc slot.
// 2) A fully valid object, with a valid class pointer pointing to a real class.
// Other states are not allowed.
//
// An object that is invalid only temporarily, and will eventually become valid.
// The internal runtime code simply checks if the object is not null or is partial and then
// ignores it.
//
// (Note: The actual check is done by seeing if a non-null object has a class pointer pointing
// to ClassClass, and that the ClassClass's class pointer is self-cyclic. A rosalloc free slot
// "next" pointer is not-cyclic.)
//
// See also b/28790624 for a listing of CLs dealing with this race.
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)]
mov r0, r3 // Set the return value and return.
// No barrier. The class is already observably initialized (otherwise the fast
// path size check above would fail) and new-instance allocations are protected
// from publishing by the compiler which inserts its own StoreStore barrier.
bx lr
.Lslow_path\c_name:
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
mov r1, rSELF @ pass Thread::Current
bl \cxx_name @ (mirror::Class* cls, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END \c_name
.endm
ART_QUICK_ALLOC_OBJECT_ROSALLOC art_quick_alloc_object_resolved_rosalloc, artAllocObjectFromCodeResolvedRosAlloc, /* isInitialized */ 0
ART_QUICK_ALLOC_OBJECT_ROSALLOC art_quick_alloc_object_initialized_rosalloc, artAllocObjectFromCodeInitializedRosAlloc, /* isInitialized */ 1
// The common fast path code for art_quick_alloc_object_resolved/initialized_tlab
// and art_quick_alloc_object_resolved/initialized_region_tlab.
//
// r0: type, rSELF (r9): Thread::Current, r1, r2, r3, r12: free.
// Need to preserve r0 to the slow path.
//
// If isInitialized=1 then the compiler assumes the object's class has already been initialized.
// If isInitialized=0 the compiler can only assume it's been at least resolved.
.macro ALLOC_OBJECT_RESOLVED_TLAB_FAST_PATH slowPathLabel isInitialized
// 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, [rSELF, #THREAD_LOCAL_POS_OFFSET]
sub r12, r3, r12 // Compute the remaining buf size.
ldr r3, [r0, #MIRROR_CLASS_OBJECT_SIZE_ALLOC_FAST_PATH_OFFSET] // Load the object size (r3).
cmp r3, r12 // Check if it fits.
// If the class is not yet visibly initialized, or it is finalizable,
// the object size will be very large to force the branch below to be taken.
//
// See Class::SetStatus() in class.cc for more details.
bhi \slowPathLabel
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber r0 and r1.
// Reload old thread_local_pos (r0)
// for the return value.
ldr r2, [rSELF, #THREAD_LOCAL_POS_OFFSET]
add r1, r2, r3
str r1, [rSELF, #THREAD_LOCAL_POS_OFFSET] // Store new thread_local_pos.
// After this "STR" the object is published to the thread local allocation stack,
// and it will be observable from a runtime internal (eg. Heap::VisitObjects) point of view.
// It is not yet visible to the running (user) compiled code until after the return.
//
// To avoid the memory barrier prior to the "STR", a trick is employed, by differentiating
// the state of the object. It can be either:
// 1) A partially valid object, with a null class pointer
// (because the initial state of TLAB buffers is all 0s/nulls).
// 2) A fully valid object, with a valid class pointer pointing to a real class.
// Other states are not allowed.
//
// An object that is invalid only temporarily, and will eventually become valid.
// The internal runtime code simply checks if the object is not null or is partial and then
// ignores it.
//
// (Note: The actual check is done by checking that the object's class pointer is non-null.
// Also, unlike rosalloc, the object can never be observed as null).
ldr r1, [rSELF, #THREAD_LOCAL_OBJECTS_OFFSET] // Increment thread_local_objects.
add r1, r1, #1
str r1, [rSELF, #THREAD_LOCAL_OBJECTS_OFFSET]
POISON_HEAP_REF r0
str r0, [r2, #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.
mov r0, r2
// No barrier. The class is already observably initialized (otherwise the fast
// path size check above would fail) and new-instance allocations are protected
// from publishing by the compiler which inserts its own StoreStore barrier.
bx lr
.endm
// The common code for art_quick_alloc_object_*region_tlab
// Currently the implementation ignores isInitialized. TODO(b/172087402): clean this up.
// Caller must execute a constructor fence after this.
.macro GENERATE_ALLOC_OBJECT_RESOLVED_TLAB name, entrypoint, isInitialized
ENTRY \name
// Fast path tlab allocation.
// r0: type, rSELF (r9): Thread::Current
// r1, r2, r3, r12: free.
ALLOC_OBJECT_RESOLVED_TLAB_FAST_PATH .Lslow_path\name, \isInitialized
.Lslow_path\name:
SETUP_SAVE_REFS_ONLY_FRAME r2 // Save callee saves in case of GC.
mov r1, rSELF // Pass Thread::Current.
bl \entrypoint // (mirror::Class* klass, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END \name
.endm
GENERATE_ALLOC_OBJECT_RESOLVED_TLAB art_quick_alloc_object_resolved_region_tlab, artAllocObjectFromCodeResolvedRegionTLAB, /* isInitialized */ 0
GENERATE_ALLOC_OBJECT_RESOLVED_TLAB art_quick_alloc_object_initialized_region_tlab, artAllocObjectFromCodeInitializedRegionTLAB, /* isInitialized */ 1
GENERATE_ALLOC_OBJECT_RESOLVED_TLAB art_quick_alloc_object_resolved_tlab, artAllocObjectFromCodeResolvedTLAB, /* isInitialized */ 0
GENERATE_ALLOC_OBJECT_RESOLVED_TLAB art_quick_alloc_object_initialized_tlab, artAllocObjectFromCodeInitializedTLAB, /* isInitialized */ 1
// The common fast path code for art_quick_alloc_array_resolved/initialized_tlab
// and art_quick_alloc_array_resolved/initialized_region_tlab.
//
// r0: type, r1: component_count, r2: total_size, rSELF (r9): Thread::Current, r3, r12: free.
// Need to preserve r0 and r1 to the slow path.
.macro ALLOC_ARRAY_TLAB_FAST_PATH_RESOLVED_WITH_SIZE slowPathLabel
and r2, r2, #OBJECT_ALIGNMENT_MASK_TOGGLED // Apply alignment mask
// (addr + 7) & ~7.
// Load thread_local_pos (r3) and
// thread_local_end (r12) 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 r3, r12, [rSELF, #THREAD_LOCAL_POS_OFFSET]
sub r12, r12, r3 // Compute the remaining buf size.
cmp r2, r12 // Check if the total_size fits.
// The array class is always initialized here. Unlike new-instance,
// this does not act as a double test.
bhi \slowPathLabel
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber r0 and r1.
add r2, r2, r3
str r2, [rSELF, #THREAD_LOCAL_POS_OFFSET] // Store new thread_local_pos.
ldr r2, [rSELF, #THREAD_LOCAL_OBJECTS_OFFSET] // Increment thread_local_objects.
add r2, r2, #1
str r2, [rSELF, #THREAD_LOCAL_OBJECTS_OFFSET]
POISON_HEAP_REF r0
str r0, [r3, #MIRROR_OBJECT_CLASS_OFFSET] // Store the class pointer.
str r1, [r3, #MIRROR_ARRAY_LENGTH_OFFSET] // Store the array length.
// 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.
mov r0, r3
// new-array is special. The class is loaded and immediately goes to the Initialized state
// before it is published. Therefore the only fence needed is for the publication of the object.
// See ClassLinker::CreateArrayClass() for more details.
// For publication of the new array, we don't need a 'dmb ishst' here.
// The compiler generates 'dmb ishst' for all new-array insts.
bx lr
.endm
// Caller must execute a constructor fence after this.
.macro GENERATE_ALLOC_ARRAY_TLAB name, entrypoint, size_setup
ENTRY \name
// Fast path array allocation for region tlab allocation.
// r0: mirror::Class* type
// r1: int32_t component_count
// rSELF (r9): thread
// r2, r3, r12: free.
\size_setup .Lslow_path\name
ALLOC_ARRAY_TLAB_FAST_PATH_RESOLVED_WITH_SIZE .Lslow_path\name
.Lslow_path\name:
// r0: mirror::Class* klass
// r1: int32_t component_count
// r2: Thread* self
SETUP_SAVE_REFS_ONLY_FRAME r2 // save callee saves in case of GC
mov r2, rSELF // pass Thread::Current
bl \entrypoint
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END \name
.endm
.macro COMPUTE_ARRAY_SIZE_UNKNOWN slow_path
movw r2, #((MIN_LARGE_OBJECT_THRESHOLD - MIRROR_WIDE_ARRAY_DATA_OFFSET) / 8)
cmp r1, r2
bhi \slow_path
// Array classes are never finalizable
// or uninitialized, no need to check.
ldr r3, [r0, #MIRROR_CLASS_COMPONENT_TYPE_OFFSET] // Load component type
UNPOISON_HEAP_REF r3
ldr r3, [r3, #MIRROR_CLASS_OBJECT_PRIMITIVE_TYPE_OFFSET]
lsr r3, r3, #PRIMITIVE_TYPE_SIZE_SHIFT_SHIFT // Component size shift is in high 16
// bits.
lsl r2, r1, r3 // Calculate data size
// Add array data offset and alignment.
add r2, r2, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
#if MIRROR_WIDE_ARRAY_DATA_OFFSET != MIRROR_INT_ARRAY_DATA_OFFSET + 4
#error Long array data offset must be 4 greater than int array data offset.
#endif
add r3, r3, #1 // Add 4 to the length only if the
// component size shift is 3
// (for 64 bit alignment).
and r3, r3, #4
add r2, r2, r3
.endm
.macro COMPUTE_ARRAY_SIZE_8 slow_path
// Possibly a large object, go slow.
// Also does negative array size check.
movw r2, #(MIN_LARGE_OBJECT_THRESHOLD - MIRROR_INT_ARRAY_DATA_OFFSET)
cmp r1, r2
bhi \slow_path
// Add array data offset and alignment.
add r2, r1, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_16 slow_path
// Possibly a large object, go slow.
// Also does negative array size check.
movw r2, #((MIN_LARGE_OBJECT_THRESHOLD - MIRROR_INT_ARRAY_DATA_OFFSET) / 2)
cmp r1, r2
bhi \slow_path
lsl r2, r1, #1
// Add array data offset and alignment.
add r2, r2, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_32 slow_path
// Possibly a large object, go slow.
// Also does negative array size check.
movw r2, #((MIN_LARGE_OBJECT_THRESHOLD - MIRROR_INT_ARRAY_DATA_OFFSET) / 4)
cmp r1, r2
bhi \slow_path
lsl r2, r1, #2
// Add array data offset and alignment.
add r2, r2, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_64 slow_path
// Possibly a large object, go slow.
// Also does negative array size check.
movw r2, #((MIN_LARGE_OBJECT_THRESHOLD - MIRROR_LONG_ARRAY_DATA_OFFSET) / 8)
cmp r1, r2
bhi \slow_path
lsl r2, r1, #3
// Add array data offset and alignment.
add r2, r2, #(MIRROR_WIDE_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved_region_tlab, artAllocArrayFromCodeResolvedRegionTLAB, COMPUTE_ARRAY_SIZE_UNKNOWN
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved8_region_tlab, artAllocArrayFromCodeResolvedRegionTLAB, COMPUTE_ARRAY_SIZE_8
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved16_region_tlab, artAllocArrayFromCodeResolvedRegionTLAB, COMPUTE_ARRAY_SIZE_16
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved32_region_tlab, artAllocArrayFromCodeResolvedRegionTLAB, COMPUTE_ARRAY_SIZE_32
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved64_region_tlab, artAllocArrayFromCodeResolvedRegionTLAB, COMPUTE_ARRAY_SIZE_64
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved_tlab, artAllocArrayFromCodeResolvedTLAB, COMPUTE_ARRAY_SIZE_UNKNOWN
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved8_tlab, artAllocArrayFromCodeResolvedTLAB, COMPUTE_ARRAY_SIZE_8
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved16_tlab, artAllocArrayFromCodeResolvedTLAB, COMPUTE_ARRAY_SIZE_16
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved32_tlab, artAllocArrayFromCodeResolvedTLAB, COMPUTE_ARRAY_SIZE_32
GENERATE_ALLOC_ARRAY_TLAB art_quick_alloc_array_resolved64_tlab, artAllocArrayFromCodeResolvedTLAB, COMPUTE_ARRAY_SIZE_64
/*
* Called by managed code when the value in rSUSPEND has been decremented to 0.
*/
.extern artTestSuspendFromCode
ENTRY art_quick_test_suspend
SETUP_SAVE_EVERYTHING_FRAME r0, RUNTIME_SAVE_EVERYTHING_FOR_SUSPEND_CHECK_METHOD_OFFSET @ save everything for GC stack crawl
mov r0, rSELF
bl artTestSuspendFromCode @ (Thread*)
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
bx lr
END art_quick_test_suspend
.extern artImplicitSuspendFromCode
ENTRY art_quick_implicit_suspend
mov r0, rSELF
SETUP_SAVE_REFS_ONLY_FRAME r1 @ save callee saves for stack crawl
bl artImplicitSuspendFromCode @ (Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
bx lr
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_SAVE_REFS_AND_ARGS_FRAME_WITH_METHOD_IN_R0
mov r2, rSELF @ pass Thread::Current
mov r3, sp @ pass SP
blx artQuickProxyInvokeHandler @ (Method* proxy method, receiver, Thread*, SP)
ldr r2, [rSELF, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
// Tear down the callee-save frame. Skip arg registers.
add sp, #(FRAME_SIZE_SAVE_REFS_AND_ARGS - FRAME_SIZE_SAVE_REFS_ONLY)
.cfi_adjust_cfa_offset -(FRAME_SIZE_SAVE_REFS_AND_ARGS - FRAME_SIZE_SAVE_REFS_ONLY)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
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.
*
* Note that this stub writes to r0, r4, and r12.
*/
ENTRY art_quick_imt_conflict_trampoline
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 successfully 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:
// Pass interface method to the trampoline.
mov r0, r12
INVOKE_TRAMPOLINE_BODY artInvokeInterfaceTrampoline
END art_quick_imt_conflict_trampoline
.extern artQuickResolutionTrampoline
ENTRY art_quick_resolution_trampoline
SETUP_SAVE_REFS_AND_ARGS_FRAME r2
mov r2, rSELF @ pass Thread::Current
mov r3, sp @ pass SP
blx artQuickResolutionTrampoline @ (Method* called, receiver, Thread*, SP)
cbz r0, 1f @ is code pointer null? goto exception
.cfi_remember_state
mov r12, r0
ldr r0, [sp, #0] @ load resolved method in r0
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
bx r12 @ tail-call into actual code
1:
CFI_RESTORE_STATE_AND_DEF_CFA sp, FRAME_SIZE_SAVE_REFS_AND_ARGS
RESTORE_SAVE_REFS_AND_ARGS_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_resolution_trampoline
/*
* Called to do a generic JNI down-call
*/
ENTRY art_quick_generic_jni_trampoline
SETUP_SAVE_REFS_AND_ARGS_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*, managed_sp, reserved_area)
// r0 r1 r2 <= C calling convention
// rSELF r10 sp <= where they are
mov r0, rSELF // Thread*
mov r1, r10 // SP for the managed frame.
mov r2, sp // reserved area for arguments and other saved data (up to managed frame)
blx artQuickGenericJniTrampoline // (Thread*, managed_sp, reserved_area)
// 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.
// The bottom of the reserved area contains values for arg registers,
// hidden arg register and SP for out args for the call.
// Check for error (class init check or locking for synchronized native method can throw).
cbz r0, .Lexception_in_native
// Save the code pointer
mov lr, r0
// Load parameters from frame into registers r0-r3 (soft-float),
// hidden arg (r4) for @CriticalNative and SP for out args.
pop {r0-r3, r4, ip}
// Apply the new SP for out args, releasing unneeded reserved area.
mov sp, ip
// Softfloat.
// TODO: Change to hardfloat when supported.
blx lr // 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 rSELF, r11
// Pending exceptions possible.
ldr r2, [rSELF, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
cbnz r2, .Lexception_in_native
// Tear down the alloca.
mov sp, r10
.cfi_remember_state
.cfi_def_cfa_register sp
// Tear down the callee-save frame. Skip arg registers.
add sp, #FRAME_SIZE_SAVE_REFS_AND_ARGS-FRAME_SIZE_SAVE_REFS_ONLY
.cfi_adjust_cfa_offset -(FRAME_SIZE_SAVE_REFS_AND_ARGS-FRAME_SIZE_SAVE_REFS_ONLY)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
// 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_RESTORE_STATE_AND_DEF_CFA r10, FRAME_SIZE_SAVE_REFS_AND_ARGS
.Lexception_in_native:
ldr ip, [rSELF, #THREAD_TOP_QUICK_FRAME_OFFSET]
add ip, ip, #-1 // Remove the GenericJNI tag. ADD/SUB writing directly to SP is UNPREDICTABLE.
mov sp, ip
bl art_deliver_pending_exception
END art_quick_generic_jni_trampoline
ENTRY art_deliver_pending_exception
# This will create a new save-all frame, required by the runtime.
DELIVER_PENDING_EXCEPTION
END art_deliver_pending_exception
.extern artQuickToInterpreterBridge
ENTRY art_quick_to_interpreter_bridge
SETUP_SAVE_REFS_AND_ARGS_FRAME r1
mov r1, rSELF @ pass Thread::Current
mov r2, sp @ pass SP
blx artQuickToInterpreterBridge @ (Method* method, Thread*, SP)
ldr r2, [rSELF, #THREAD_EXCEPTION_OFFSET] @ load Thread::Current()->exception_
// Tear down the callee-save frame. Skip arg registers.
add sp, #(FRAME_SIZE_SAVE_REFS_AND_ARGS - FRAME_SIZE_SAVE_REFS_ONLY)
.cfi_adjust_cfa_offset -(FRAME_SIZE_SAVE_REFS_AND_ARGS - FRAME_SIZE_SAVE_REFS_ONLY)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
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
/*
* Called to attempt to execute an obsolete method.
*/
ONE_ARG_RUNTIME_EXCEPTION art_invoke_obsolete_method_stub, artInvokeObsoleteMethod
/*
* 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_SAVE_REFS_AND_ARGS_FRAME r2
@ preserve r0 (not normally an arg) knowing there is a spare slot in kSaveRefsAndArgs.
str r0, [sp, #4]
mov r2, rSELF @ pass Thread::Current
mov r3, sp @ pass SP
blx artInstrumentationMethodEntryFromCode @ (Method*, Object*, Thread*, SP)
cbz r0, .Ldeliver_instrumentation_entry_exception
.cfi_remember_state
@ Deliver exception if we got nullptr as function.
mov r12, r0 @ r12 holds reference to code
ldr r0, [sp, #4] @ restore r0
RESTORE_SAVE_REFS_AND_ARGS_FRAME
adr lr, art_quick_instrumentation_exit + /* thumb mode */ 1
@ load art_quick_instrumentation_exit into lr in thumb mode
REFRESH_MARKING_REGISTER
bx r12 @ call method with lr set to art_quick_instrumentation_exit
.Ldeliver_instrumentation_entry_exception:
CFI_RESTORE_STATE_AND_DEF_CFA sp, FRAME_SIZE_SAVE_REFS_AND_ARGS
@ Deliver exception for art_quick_instrumentation_entry placed after
@ art_quick_instrumentation_exit so that the fallthrough works.
RESTORE_SAVE_REFS_AND_ARGS_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_instrumentation_entry
ENTRY art_quick_instrumentation_exit
mov lr, #0 @ link register is to here, so clobber with 0 for later checks
SETUP_SAVE_EVERYTHING_FRAME r2
add r3, sp, #8 @ store fpr_res pointer, in kSaveEverything frame
add r2, sp, #136 @ store gpr_res pointer, in kSaveEverything frame
mov r1, sp @ pass SP
mov r0, rSELF @ pass Thread::Current
blx artInstrumentationMethodExitFromCode @ (Thread*, SP, gpr_res*, fpr_res*)
cbz r0, .Ldo_deliver_instrumentation_exception
@ Deliver exception if we got nullptr as function.
.cfi_remember_state
cbnz r1, .Ldeoptimize
// Normal return.
str r0, [sp, #FRAME_SIZE_SAVE_EVERYTHING - 4]
@ Set return pc.
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
bx lr
.Ldo_deliver_instrumentation_exception:
CFI_RESTORE_STATE_AND_DEF_CFA sp, FRAME_SIZE_SAVE_EVERYTHING
DELIVER_PENDING_EXCEPTION_FRAME_READY
.Ldeoptimize:
str r1, [sp, #FRAME_SIZE_SAVE_EVERYTHING - 4]
@ Set return pc.
RESTORE_SAVE_EVERYTHING_FRAME
// Jump to art_quick_deoptimize.
b art_quick_deoptimize
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_EVERYTHING_FRAME r0
mov r0, rSELF @ pass Thread::Current
blx 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_EVERYTHING_FRAME r1
mov r1, rSELF @ pass Thread::Current
blx artDeoptimizeFromCompiledCode @ (DeoptimizationKind, 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
#if (STRING_COMPRESSION_FEATURE)
ldr r4, [r0, #MIRROR_STRING_COUNT_OFFSET]
#else
ldr r3, [r0, #MIRROR_STRING_COUNT_OFFSET]
#endif
add r0, #MIRROR_STRING_VALUE_OFFSET
#if (STRING_COMPRESSION_FEATURE)
/* r4 count (with flag) and r3 holds actual length */
lsr r3, r4, #1
#endif
/* 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 */
#if (STRING_COMPRESSION_FEATURE)
lsrs r4, r4, #1
bcc .Lstring_indexof_compressed
#endif
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
* r4: compression style (used temporarily)
* 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}
#if (STRING_COMPRESSION_FEATURE)
.Lstring_indexof_compressed:
add r0, r0, r2
sub r0, #1
sub r2, r3, r2
.Lstring_indexof_compressed_loop:
subs r2, #1
blt .Lindexof_nomatch
ldrb r3, [r0, #1]!
cmp r3, r1
beq .Lstring_indexof_compressed_matched
b .Lstring_indexof_compressed_loop
.Lstring_indexof_compressed_matched:
sub r0, r12
pop {r4, r10-r11, pc}
#endif
END art_quick_indexof
/* 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_fmodf
/* 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
.extern artStringBuilderAppend
ENTRY art_quick_string_builder_append
SETUP_SAVE_REFS_ONLY_FRAME r2 @ save callee saves in case of GC
add r1, sp, #(FRAME_SIZE_SAVE_REFS_ONLY + __SIZEOF_POINTER__) @ pass args
mov r2, rSELF @ pass Thread::Current
bl artStringBuilderAppend @ (uint32_t, const unit32_t*, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_string_builder_append
/*
* Create a function `name` calling the ReadBarrier::Mark routine,
* getting its argument and returning its result through register
* `reg`, saving and restoring all caller-save registers.
*
* IP is clobbered; `reg` must not be IP.
*
* If `reg` is different from `r0`, the generated function follows a
* non-standard runtime calling convention:
* - register `reg` is used to pass the (sole) argument of this
* function (instead of R0);
* - register `reg` is used to return the result of this function
* (instead of R0);
* - R0 is treated like a normal (non-argument) caller-save register;
* - everything else is the same as in the standard runtime calling
* convention (e.g. standard callee-save registers are preserved).
*/
.macro READ_BARRIER_MARK_REG name, reg
ENTRY \name
// Null check so that we can load the lock word.
SMART_CBZ \reg, .Lret_rb_\name
// Check lock word for mark bit, if marked return. Use IP for scratch since it is blocked.
ldr ip, [\reg, MIRROR_OBJECT_LOCK_WORD_OFFSET]
tst ip, #LOCK_WORD_MARK_BIT_MASK_SHIFTED
beq .Lnot_marked_rb_\name
// Already marked, return right away.
.Lret_rb_\name:
bx lr
.Lnot_marked_rb_\name:
// Test that both the forwarding state bits are 1.
#if (LOCK_WORD_STATE_SHIFT != 30) || (LOCK_WORD_STATE_FORWARDING_ADDRESS != 3)
// To use "CMP ip, #modified-immediate; BHS", we need the lock word state in
// the highest bits and the "forwarding address" state to have all bits set.
#error "Unexpected lock word state shift or forwarding address state value."
#endif
cmp ip, #(LOCK_WORD_STATE_FORWARDING_ADDRESS << LOCK_WORD_STATE_SHIFT)
bhs .Lret_forwarding_address\name
.Lslow_rb_\name:
// Save IP: The kSaveEverything entrypoint art_quick_resolve_string used to
// make a tail call here. Currently, it serves only for stack alignment but
// we may reintroduce kSaveEverything calls here in the future.
push {r0-r4, r9, ip, lr} @ save return address, core caller-save registers and ip
.cfi_adjust_cfa_offset 32
.cfi_rel_offset r0, 0
.cfi_rel_offset r1, 4
.cfi_rel_offset r2, 8
.cfi_rel_offset r3, 12
.cfi_rel_offset r4, 16
.cfi_rel_offset r9, 20
.cfi_rel_offset ip, 24
.cfi_rel_offset lr, 28
.ifnc \reg, r0
mov r0, \reg @ pass arg1 - obj from `reg`
.endif
vpush {s0-s15} @ save floating-point caller-save registers
.cfi_adjust_cfa_offset 64
bl artReadBarrierMark @ r0 <- artReadBarrierMark(obj)
vpop {s0-s15} @ restore floating-point registers
.cfi_adjust_cfa_offset -64
.ifc \reg, r0 @ Save result to the stack slot or destination register.
str r0, [sp, #0]
.else
.ifc \reg, r1
str r0, [sp, #4]
.else
.ifc \reg, r2
str r0, [sp, #8]
.else
.ifc \reg, r3
str r0, [sp, #12]
.else
.ifc \reg, r4
str r0, [sp, #16]
.else
.ifc \reg, r9
str r0, [sp, #20]
.else
mov \reg, r0
.endif
.endif
.endif
.endif
.endif
.endif
pop {r0-r4, r9, ip, lr} @ restore caller-save registers
.cfi_adjust_cfa_offset -32
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore r3
.cfi_restore r4
.cfi_restore r9
.cfi_restore ip
.cfi_restore lr
bx lr
.Lret_forwarding_address\name:
// Shift left by the forwarding address shift. This clears out the state bits since they are
// in the top 2 bits of the lock word.
lsl \reg, ip, #LOCK_WORD_STATE_FORWARDING_ADDRESS_SHIFT
bx lr
END \name
.endm
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg00, r0
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg01, r1
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg02, r2
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg03, r3
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg04, r4
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg05, r5
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg06, r6
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg07, r7
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg08, r8
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg09, r9
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg10, r10
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg11, r11
// Helper macros for Baker CC read barrier mark introspection (BRBMI).
.macro BRBMI_FOR_REGISTERS macro_for_register, macro_for_reserved_register
\macro_for_register r0
\macro_for_register r1
\macro_for_register r2
\macro_for_register r3
\macro_for_register r4
\macro_for_register r5
\macro_for_register r6
\macro_for_register r7
\macro_for_reserved_register // r8 (rMR) is the marking register.
\macro_for_register r9
\macro_for_register r10
\macro_for_register r11
\macro_for_reserved_register // IP is reserved.
\macro_for_reserved_register // SP is reserved.
\macro_for_reserved_register // LR is reserved.
\macro_for_reserved_register // PC is reserved.
.endm
.macro BRBMI_RETURN_SWITCH_CASE reg
.balign 8
.Lmark_introspection_return_switch_case_\reg:
mov rMR, #1
mov \reg, ip
bx lr
.endm
.macro BRBMI_RETURN_SWITCH_CASE_OFFSET reg
.byte (.Lmark_introspection_return_switch_case_\reg - .Lmark_introspection_return_table) / 2
.endm
.macro BRBMI_BAD_RETURN_SWITCH_CASE_OFFSET
.byte (.Lmark_introspection_return_switch_case_bad - .Lmark_introspection_return_table) / 2
.endm
#if BAKER_MARK_INTROSPECTION_FIELD_LDR_WIDE_OFFSET != BAKER_MARK_INTROSPECTION_ARRAY_LDR_OFFSET
#error "Array and field introspection code sharing requires same LDR offset."
#endif
.macro BRBMI_ARRAY_LOAD index_reg
ldr ip, [ip, \index_reg, lsl #2] // 4 bytes.
b art_quick_read_barrier_mark_introspection // Should be 2 bytes, encoding T2.
.balign 8 // Add padding to 8 bytes.
.endm
.macro BRBMI_BKPT_FILL_4B
bkpt 0
bkpt 0
.endm
.macro BRBMI_BKPT_FILL_8B
BRBMI_BKPT_FILL_4B
BRBMI_BKPT_FILL_4B
.endm
.macro BRBMI_RUNTIME_CALL
// Note: This macro generates exactly 22 bytes of code. The core register
// PUSH and the MOVs are 16-bit instructions, the rest is 32-bit instructions.
push {r0-r3, r7, lr} // Save return address and caller-save registers.
.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 r7, 16
.cfi_rel_offset lr, 20
mov r0, ip // Pass the reference.
vpush {s0-s15} // save floating-point caller-save registers
.cfi_adjust_cfa_offset 64
bl artReadBarrierMark // r0 <- artReadBarrierMark(obj)
vpop {s0-s15} // restore floating-point registers
.cfi_adjust_cfa_offset -64
mov ip, r0 // Move reference to ip in preparation for return switch.
pop {r0-r3, r7, lr} // Restore registers.
.cfi_adjust_cfa_offset -24
.cfi_restore r0
.cfi_restore r1
.cfi_restore r2
.cfi_restore r3
.cfi_restore r7
.cfi_restore lr
.endm
.macro BRBMI_CHECK_NULL_AND_MARKED label_suffix
// If reference is null, just return it in the right register.
cmp ip, #0
beq .Lmark_introspection_return\label_suffix
// Use rMR as temp and check the mark bit of the reference.
ldr rMR, [ip, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
tst rMR, #LOCK_WORD_MARK_BIT_MASK_SHIFTED
beq .Lmark_introspection_unmarked\label_suffix
.Lmark_introspection_return\label_suffix:
.endm
.macro BRBMI_UNMARKED_FORWARDING_ADDRESS_CHECK label_suffix
.Lmark_introspection_unmarked\label_suffix:
// Check if the top two bits are one, if this is the case it is a forwarding address.
#if (LOCK_WORD_STATE_SHIFT != 30) || (LOCK_WORD_STATE_FORWARDING_ADDRESS != 3)
// To use "CMP ip, #modified-immediate; BHS", we need the lock word state in
// the highest bits and the "forwarding address" state to have all bits set.
#error "Unexpected lock word state shift or forwarding address state value."
#endif
cmp rMR, #(LOCK_WORD_STATE_FORWARDING_ADDRESS << LOCK_WORD_STATE_SHIFT)
bhs .Lmark_introspection_forwarding_address\label_suffix
.endm
.macro BRBMI_EXTRACT_FORWARDING_ADDRESS label_suffix
.Lmark_introspection_forwarding_address\label_suffix:
// Note: This macro generates exactly 22 bytes of code, the branch is near.
// Shift left by the forwarding address shift. This clears out the state bits since they are
// in the top 2 bits of the lock word.
lsl ip, rMR, #LOCK_WORD_STATE_FORWARDING_ADDRESS_SHIFT
b .Lmark_introspection_return\label_suffix
.endm
.macro BRBMI_LOAD_RETURN_REG_FROM_CODE_wide ldr_offset
// Load the half of the instruction that contains Rt. Adjust for the thumb state in LR.
ldrh rMR, [lr, #(-1 + \ldr_offset + 2)]
.endm
.macro BRBMI_LOAD_RETURN_REG_FROM_CODE_narrow ldr_offset
// Load the 16-bit instruction. Adjust for the thumb state in LR.
ldrh rMR, [lr, #(-1 + \ldr_offset)]
.endm
.macro BRBMI_EXTRACT_RETURN_REG_wide
lsr rMR, rMR, #12 // Extract `ref_reg`.
.endm
.macro BRBMI_EXTRACT_RETURN_REG_narrow
and rMR, rMR, #7 // Extract `ref_reg`.
.endm
.macro BRBMI_LOAD_AND_EXTRACT_RETURN_REG ldr_offset, label_suffix
BRBMI_LOAD_RETURN_REG_FROM_CODE\label_suffix \ldr_offset
BRBMI_EXTRACT_RETURN_REG\label_suffix
.endm
.macro BRBMI_GC_ROOT gc_root_ldr_offset, label_suffix
.balign 32
.thumb_func
.type art_quick_read_barrier_mark_introspection_gc_roots\label_suffix, #function
.hidden art_quick_read_barrier_mark_introspection_gc_roots\label_suffix
.global art_quick_read_barrier_mark_introspection_gc_roots\label_suffix
art_quick_read_barrier_mark_introspection_gc_roots\label_suffix:
BRBMI_LOAD_AND_EXTRACT_RETURN_REG \gc_root_ldr_offset, \label_suffix
.endm
.macro BRBMI_FIELD_SLOW_PATH ldr_offset, label_suffix
.balign 16
// Note: Generates exactly 16 bytes of code.
BRBMI_UNMARKED_FORWARDING_ADDRESS_CHECK \label_suffix
BRBMI_LOAD_AND_EXTRACT_RETURN_REG \ldr_offset, \label_suffix
b .Lmark_introspection_runtime_call
.endm
/*
* Use introspection to load a reference from the same address as the LDR
* instruction in generated code would load (unless loaded by the thunk,
* see below), call ReadBarrier::Mark() with that reference if needed
* and return it in the same register as the LDR instruction would load.
*
* The entrypoint is called through a thunk that differs across load kinds.
* For field and array loads the LDR instruction in generated code follows
* the branch to the thunk, i.e. the LDR is (ignoring the heap poisoning)
* at [LR, #(-4 - 1)] (encoding T3) or [LR, #(-2 - 1)] (encoding T1) where
* the -1 is an adjustment for the Thumb mode bit in LR, and the thunk
* knows the holder and performs the gray bit check, returning to the LDR
* instruction if the object is not gray, so this entrypoint no longer
* needs to know anything about the holder. For GC root loads, the LDR
* instruction in generated code precedes the branch to the thunk, i.e. the
* LDR is at [LR, #(-8 - 1)] (encoding T3) or [LR, #(-6 - 1)] (encoding T1)
* where the -1 is again the Thumb mode bit adjustment, and the thunk does
* not do the gray bit check.
*
* For field accesses and array loads with a constant index the thunk loads
* the reference into IP using introspection and calls the main entrypoint
* ("wide", for 32-bit LDR) art_quick_read_barrier_mark_introspection or
* the "narrow" entrypoint (for 16-bit LDR). The latter is at a known
* offset (BAKER_MARK_INTROSPECTION_FIELD_LDR_NARROW_ENTRYPOINT_OFFSET)
* from the main entrypoint and the thunk adjusts the entrypoint pointer.
* With heap poisoning enabled, the passed reference is poisoned.
*
* For array accesses with non-constant index, the thunk inserts the bits
* 0-5 of the LDR instruction to the entrypoint address, effectively
* calculating a switch case label based on the index register (bits 0-3)
* and adding an extra offset (bits 4-5 hold the shift which is always 2
* for reference loads) to differentiate from the main entrypoint, then
* moves the base register to IP and jumps to the switch case. Therefore
* we need to align the main entrypoint to 512 bytes, accounting for
* a 256-byte offset followed by 16 array entrypoints starting at
* art_quick_read_barrier_mark_introspection_arrays, each containing an LDR
* (register) and a branch to the main entrypoint.
*
* For GC root accesses we cannot use the main entrypoint because of the
* different offset where the LDR instruction in generated code is located.
* (And even with heap poisoning enabled, GC roots are not poisoned.)
* To re-use the same entrypoint pointer in generated code, we make sure
* that the gc root entrypoint (a copy of the entrypoint with a different
* offset for introspection loads) is located at a known offset (0xc0/0xe0
* bytes, or BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_WIDE_ENTRYPOINT_OFFSET/
* BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_NARROW_ENTRYPOINT_OFFSET) from the
* main entrypoint and the GC root thunk adjusts the entrypoint pointer,
* moves the root register to IP and jumps to the customized entrypoint,
* art_quick_read_barrier_mark_introspection_gc_roots_{wide,narrow}.
* The thunk also performs all the fast-path checks, so we need just the
* slow path.
*
* Intrinsic CAS operations (VarHandle*CompareAnd{Set,Exchange}* and
* UnsafeCASObject) use similar code to the GC roots wide load but using
* MOV (register, T3) instead of the LDR (immediate, T3), with destination
* register in bits 8-11 rather than 12-15. Therefore they have their own
* entrypoint, art_quick_read_barrier_mark_introspection_intrinsic_cas
* at the offset BAKER_MARK_INTROSPECTION_INTRINSIC_CAS_ENTRYPOINT_OFFSET.
* This is used only for high registers, low registers reuse the GC roots
* narrow load entrypoint as the low 3 bits of the destination register
* for MOV (register) encoding T1 match the LDR (immediate) encoding T1.
*
* The code structure is
* art_quick_read_barrier_mark_introspection: // @0x00
* Up to 32 bytes code for main entrypoint fast-path code for fields
* (and array elements with constant offset) with LDR encoding T3;
* jumps to the switch in the "narrow" entrypoint.
* art_quick_read_barrier_mark_introspection_narrow: // @0x20
* Up to 48 bytes code for fast path code for fields (and array
* elements with constant offset) with LDR encoding T1, ending in the
* return switch instruction TBB and the table with switch offsets.
* .Lmark_introspection_return_switch_case_r0: // @0x50
* Exactly 88 bytes of code for the return switch cases (8 bytes per
* case, 11 cases; no code for reserved registers).
* .Lmark_introspection_forwarding_address_narrow: // @0xa8
* Exactly 6 bytes to extract the forwarding address and jump to the
* "narrow" entrypoint fast path.
* .Lmark_introspection_return_switch_case_bad: // @0xae
* Exactly 2 bytes, bkpt for unexpected return register.
* .Lmark_introspection_unmarked_narrow: // @0xb0
* Exactly 16 bytes for "narrow" entrypoint slow path.
* art_quick_read_barrier_mark_introspection_gc_roots_wide: // @0xc0
* GC root entrypoint code for LDR encoding T3 (10 bytes); loads and
* extracts the return register and jumps to the runtime call.
* .Lmark_introspection_forwarding_address_wide: // @0xca
* Exactly 6 bytes to extract the forwarding address and jump to the
* "wide" entrypoint fast path.
* .Lmark_introspection_unmarked_wide: // @0xd0
* Exactly 16 bytes for "wide" entrypoint slow path.
* art_quick_read_barrier_mark_introspection_gc_roots_narrow: // @0xe0
* GC root entrypoint code for LDR encoding T1 (8 bytes); loads and
* extracts the return register and falls through to the runtime call.
* .Lmark_introspection_runtime_call: // @0xe8
* Exactly 24 bytes for the runtime call to MarkReg() and jump to the
* return switch.
* art_quick_read_barrier_mark_introspection_arrays: // @0x100
* Exactly 128 bytes for array load switch cases (16x2 instructions).
* art_quick_read_barrier_mark_introspection_intrinsic_cas: // @0x180
* Intrinsic CAS entrypoint for MOV (register) encoding T3 (6 bytes).
* Loads the return register and jumps to the runtime call.
*/
#if defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
ENTRY_ALIGNED art_quick_read_barrier_mark_introspection, 512
// At this point, IP contains the reference, rMR is clobbered by the thunk
// and can be freely used as it will be set back to 1 before returning.
// For heap poisoning, the reference is poisoned, so unpoison it first.
UNPOISON_HEAP_REF ip
// Check for null or marked, lock word is loaded into rMR.
BRBMI_CHECK_NULL_AND_MARKED _wide
// Load and extract the return register from the instruction.
BRBMI_LOAD_AND_EXTRACT_RETURN_REG BAKER_MARK_INTROSPECTION_FIELD_LDR_WIDE_OFFSET, _wide
b .Lmark_introspection_return_switch
.balign 32
.thumb_func
.type art_quick_read_barrier_mark_introspection_narrow, #function
.hidden art_quick_read_barrier_mark_introspection_narrow
.global art_quick_read_barrier_mark_introspection_narrow
art_quick_read_barrier_mark_introspection_narrow:
// At this point, IP contains the reference, rMR is clobbered by the thunk
// and can be freely used as it will be set back to 1 before returning.
// For heap poisoning, the reference is poisoned, so unpoison it first.
UNPOISON_HEAP_REF ip
// Check for null or marked, lock word is loaded into rMR.
BRBMI_CHECK_NULL_AND_MARKED _narrow
// Load and extract the return register from the instruction.
BRBMI_LOAD_AND_EXTRACT_RETURN_REG BAKER_MARK_INTROSPECTION_FIELD_LDR_NARROW_OFFSET, _narrow
.Lmark_introspection_return_switch:
tbb [pc, rMR] // Jump to the switch case.
.Lmark_introspection_return_table:
BRBMI_FOR_REGISTERS BRBMI_RETURN_SWITCH_CASE_OFFSET, BRBMI_BAD_RETURN_SWITCH_CASE_OFFSET
BRBMI_FOR_REGISTERS BRBMI_RETURN_SWITCH_CASE, /* no code */
.balign 8
BRBMI_EXTRACT_FORWARDING_ADDRESS _narrow // 6 bytes
.Lmark_introspection_return_switch_case_bad:
bkpt // 2 bytes
BRBMI_FIELD_SLOW_PATH BAKER_MARK_INTROSPECTION_FIELD_LDR_NARROW_OFFSET, _narrow
// 8 bytes for the loading and extracting of the return register.
BRBMI_GC_ROOT BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_WIDE_OFFSET, _wide
// 2 bytes for near branch to the runtime call.
b .Lmark_introspection_runtime_call
BRBMI_EXTRACT_FORWARDING_ADDRESS _wide // Not even 4-byte aligned.
BRBMI_FIELD_SLOW_PATH BAKER_MARK_INTROSPECTION_FIELD_LDR_WIDE_OFFSET, _wide
// 8 bytes for the loading and extracting of the return register.
BRBMI_GC_ROOT BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_NARROW_OFFSET, _narrow
// And the runtime call and branch to the switch taking exactly 24 bytes
// (22 bytes for BRBMI_RUNTIME_CALL and 2 bytes for the near branch)
// shall take the rest of the 32-byte section (within a cache line).
.Lmark_introspection_runtime_call:
BRBMI_RUNTIME_CALL
b .Lmark_introspection_return_switch
.balign 256
.thumb_func
.type art_quick_read_barrier_mark_introspection_arrays, #function
.hidden art_quick_read_barrier_mark_introspection_arrays
.global art_quick_read_barrier_mark_introspection_arrays
art_quick_read_barrier_mark_introspection_arrays:
BRBMI_FOR_REGISTERS BRBMI_ARRAY_LOAD, BRBMI_BKPT_FILL_8B
.balign 8
.thumb_func
.type art_quick_read_barrier_mark_introspection_intrinsic_cas, #function
.hidden art_quick_read_barrier_mark_introspection_intrinsic_cas
.global art_quick_read_barrier_mark_introspection_intrinsic_cas
art_quick_read_barrier_mark_introspection_intrinsic_cas:
// Load the byte of the MOV instruction that contains Rd. Adjust for the thumb state in LR.
// The MOV (register, T3) is |11101010010|S|1111|(0)000|Rd|0000|Rm|, so the byte we read
// here, i.e. |(0)000|Rd|, contains only the register number, the top 4 bits are 0.
ldrb rMR, [lr, #(-1 + BAKER_MARK_INTROSPECTION_INTRINSIC_CAS_MOV_OFFSET + 3)]
b .Lmark_introspection_runtime_call
END art_quick_read_barrier_mark_introspection
#else // defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
ENTRY art_quick_read_barrier_mark_introspection
bkpt // Unreachable.
END art_quick_read_barrier_mark_introspection
#endif // defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
.extern artInvokePolymorphic
ENTRY art_quick_invoke_polymorphic
SETUP_SAVE_REFS_AND_ARGS_FRAME r2
mov r0, r1 @ r0 := receiver
mov r1, rSELF @ r1 := Thread::Current
mov r2, sp @ r2 := SP
bl artInvokePolymorphic @ artInvokePolymorphic(receiver, Thread*, SP)
str r1, [sp, 72] @ r0:r1 := Result. Copy r1 to context.
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
vmov d0, r0, r1 @ Put result r0:r1 into floating point return register.
RETURN_OR_DELIVER_PENDING_EXCEPTION_REG r2
END art_quick_invoke_polymorphic
.extern artInvokeCustom
ENTRY art_quick_invoke_custom
SETUP_SAVE_REFS_AND_ARGS_FRAME r1
@ r0 := call_site_idx
mov r1, rSELF @ r1 := Thread::Current
mov r2, sp @ r2 := SP
bl artInvokeCustom @ artInvokeCustom(call_site_idx, Thread*, SP)
str r1, [sp, #72] @ Save r1 to context (r0:r1 = result)
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
vmov d0, r0, r1 @ Put result r0:r1 into floating point return register.
RETURN_OR_DELIVER_PENDING_EXCEPTION_REG r2
END art_quick_invoke_custom
// Wrap ExecuteSwitchImpl in assembly method which specifies DEX PC for unwinding.
// Argument 0: r0: The context pointer for ExecuteSwitchImpl.
// Argument 1: r1: Pointer to the templated ExecuteSwitchImpl to call.
// Argument 2: r2: The value of DEX PC (memory address of the methods bytecode).
ENTRY ExecuteSwitchImplAsm
push {r4, lr} // 2 words of callee saves.
.cfi_adjust_cfa_offset 8
.cfi_rel_offset r4, 0
.cfi_rel_offset lr, 4
mov r4, r2 // r4 = DEX PC
CFI_DEFINE_DEX_PC_WITH_OFFSET(0 /* r0 */, 4 /* r4 */, 0)
blx r1 // Call the wrapped method.
pop {r4, pc}
END ExecuteSwitchImplAsm
// r0 contains the class, r4 contains the inline cache. We can use ip as temporary.
ENTRY art_quick_update_inline_cache
#if (INLINE_CACHE_SIZE != 5)
#error "INLINE_CACHE_SIZE not as expected."
#endif
#if defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
// Don't update the cache if we are marking.
cmp rMR, #0
bne .Ldone
#endif
.Lentry1:
ldr ip, [r4, #INLINE_CACHE_CLASSES_OFFSET]
cmp ip, r0
beq .Ldone
cmp ip, #0
bne .Lentry2
ldrex ip, [r4, #INLINE_CACHE_CLASSES_OFFSET]
cmp ip, #0
bne .Lentry1
strex ip, r0, [r4, #INLINE_CACHE_CLASSES_OFFSET]
cmp ip, #0
bne .Ldone
b .Lentry1
.Lentry2:
ldr ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+4]
cmp ip, r0
beq .Ldone
cmp ip, #0
bne .Lentry3
ldrex ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+4]
cmp ip, #0
bne .Lentry2
strex ip, r0, [r4, #INLINE_CACHE_CLASSES_OFFSET+4]
cmp ip, #0
bne .Ldone
b .Lentry2
.Lentry3:
ldr ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+8]
cmp ip, r0
beq .Ldone
cmp ip, #0
bne .Lentry4
ldrex ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+8]
cmp ip, #0
bne .Lentry3
strex ip, r0, [r4, #INLINE_CACHE_CLASSES_OFFSET+8]
cmp ip, #0
bne .Ldone
b .Lentry3
.Lentry4:
ldr ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+12]
cmp ip, r0
beq .Ldone
cmp ip, #0
bne .Lentry5
ldrex ip, [r4, #INLINE_CACHE_CLASSES_OFFSET+12]
cmp ip, #0
bne .Lentry4
strex ip, r0, [r4, #INLINE_CACHE_CLASSES_OFFSET+12]
cmp ip, #0
bne .Ldone
b .Lentry4
.Lentry5:
// Unconditionally store, the inline cache is megamorphic.
str r0, [r4, #INLINE_CACHE_CLASSES_OFFSET+16]
.Ldone:
blx lr
END art_quick_update_inline_cache
// On entry, method is at the bottom of the stack.
ENTRY art_quick_compile_optimized
SETUP_SAVE_EVERYTHING_FRAME r0
ldr r0, [sp, FRAME_SIZE_SAVE_EVERYTHING] @ pass ArtMethod
mov r1, rSELF @ pass Thread::Current
bl artCompileOptimized @ (ArtMethod*, Thread*)
RESTORE_SAVE_EVERYTHING_FRAME
// We don't need to restore the marking register here, as
// artCompileOptimized doesn't allow thread suspension.
blx lr
END art_quick_compile_optimized
// On entry, method is at the bottom of the stack.
ENTRY art_quick_method_entry_hook
SETUP_SAVE_EVERYTHING_FRAME r0
ldr r0, [sp, FRAME_SIZE_SAVE_EVERYTHING] @ pass ArtMethod
mov r1, rSELF @ pass Thread::Current
bl artMethodEntryHook @ (ArtMethod*, Thread*)
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
blx lr
END art_quick_method_entry_hook
ENTRY art_quick_method_exit_hook
SETUP_SAVE_EVERYTHING_FRAME r2
add r3, sp, #8 @ store fpr_res pointer, in kSaveEverything frame
add r2, sp, #136 @ store gpr_res pointer, in kSaveEverything frame
ldr r1, [sp, #FRAME_SIZE_SAVE_EVERYTHING] @ pass ArtMethod*
mov r0, rSELF @ pass Thread::Current
blx artMethodExitHook @ (Thread*, ArtMethod*, gpr_res*, fpr_res*)
.cfi_remember_state
cbnz r0, .Ldo_deliver_instrumentation_exception_exit @ Deliver exception
// Normal return.
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
blx lr
.Ldo_deliver_instrumentation_exception_exit:
CFI_RESTORE_STATE_AND_DEF_CFA sp, FRAME_SIZE_SAVE_EVERYTHING
DELIVER_PENDING_EXCEPTION_FRAME_READY
END art_quick_method_exit_hook
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