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LeafOS / LeafOS-Project / android_art / 1fcae9f0cc4995e473c39c2e2b3afd53bc1272a0 / . / runtime / arch / arm64 / quick_entrypoints_arm64.S
blob: 280e5937c61b30a5950fc1ece0637c41a2d50778 [file] [log] [blame]
/*
* Copyright (C) 2014 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_arm64.S"
#include "arch/quick_alloc_entrypoints.S"
.macro INCREASE_FRAME frame_adjustment
sub sp, sp, #(\frame_adjustment)
.cfi_adjust_cfa_offset (\frame_adjustment)
.endm
.macro DECREASE_FRAME frame_adjustment
add sp, sp, #(\frame_adjustment)
.cfi_adjust_cfa_offset -(\frame_adjustment)
.endm
.macro SAVE_REG reg, offset
str \reg, [sp, #(\offset)]
.cfi_rel_offset \reg, (\offset)
.endm
.macro RESTORE_REG reg, offset
ldr \reg, [sp, #(\offset)]
.cfi_restore \reg
.endm
.macro SAVE_REG_INCREASE_FRAME reg, frame_adjustment
str \reg, [sp, #-(\frame_adjustment)]!
.cfi_adjust_cfa_offset (\frame_adjustment)
.cfi_rel_offset \reg, 0
.endm
.macro RESTORE_REG_DECREASE_FRAME reg, frame_adjustment
ldr \reg, [sp], #(\frame_adjustment)
.cfi_restore \reg
.cfi_adjust_cfa_offset -(\frame_adjustment)
.endm
.macro SAVE_TWO_REGS reg1, reg2, offset
stp \reg1, \reg2, [sp, #(\offset)]
.cfi_rel_offset \reg1, (\offset)
.cfi_rel_offset \reg2, (\offset) + 8
.endm
.macro RESTORE_TWO_REGS reg1, reg2, offset
ldp \reg1, \reg2, [sp, #(\offset)]
.cfi_restore \reg1
.cfi_restore \reg2
.endm
.macro SAVE_TWO_REGS_INCREASE_FRAME reg1, reg2, frame_adjustment
stp \reg1, \reg2, [sp, #-(\frame_adjustment)]!
.cfi_adjust_cfa_offset (\frame_adjustment)
.cfi_rel_offset \reg1, 0
.cfi_rel_offset \reg2, 8
.endm
.macro RESTORE_TWO_REGS_DECREASE_FRAME reg1, reg2, frame_adjustment
ldp \reg1, \reg2, [sp], #(\frame_adjustment)
.cfi_restore \reg1
.cfi_restore \reg2
.cfi_adjust_cfa_offset -(\frame_adjustment)
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveAllCalleeSaves)
*/
.macro SETUP_SAVE_ALL_CALLEE_SAVES_FRAME
// art::Runtime** xIP0 = &art::Runtime::instance_
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // art::Runtime* xIP0 = art::Runtime::instance_;
// ArtMethod* xIP0 = Runtime::instance_->callee_save_methods_[kSaveAllCalleeSaves];
ldr xIP0, [xIP0, RUNTIME_SAVE_ALL_CALLEE_SAVES_METHOD_OFFSET]
INCREASE_FRAME 176
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVES != 176)
#error "FRAME_SIZE_SAVE_ALL_CALLEE_SAVES(ARM64) size not as expected."
#endif
// Stack alignment filler [sp, #8].
// FP callee-saves.
stp d8, d9, [sp, #16]
stp d10, d11, [sp, #32]
stp d12, d13, [sp, #48]
stp d14, d15, [sp, #64]
// GP callee-saves
SAVE_TWO_REGS x19, x20, 80
SAVE_TWO_REGS x21, x22, 96
SAVE_TWO_REGS x23, x24, 112
SAVE_TWO_REGS x25, x26, 128
SAVE_TWO_REGS x27, x28, 144
SAVE_TWO_REGS x29, xLR, 160
// Store ArtMethod* Runtime::callee_save_methods_[kSaveAllCalleeSaves].
str xIP0, [sp]
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveRefsOnly).
*/
.macro SETUP_SAVE_REFS_ONLY_FRAME
// art::Runtime** xIP0 = &art::Runtime::instance_
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // art::Runtime* xIP0 = art::Runtime::instance_;
// ArtMethod* xIP0 = Runtime::instance_->callee_save_methods_[kSaveRefOnly];
ldr xIP0, [xIP0, RUNTIME_SAVE_REFS_ONLY_METHOD_OFFSET]
INCREASE_FRAME 96
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_REFS_ONLY != 96)
#error "FRAME_SIZE_SAVE_REFS_ONLY(ARM64) size not as expected."
#endif
// GP callee-saves.
// x20 paired with ArtMethod* - see below.
SAVE_TWO_REGS x21, x22, 16
SAVE_TWO_REGS x23, x24, 32
SAVE_TWO_REGS x25, x26, 48
SAVE_TWO_REGS x27, x28, 64
SAVE_TWO_REGS x29, xLR, 80
// Store ArtMethod* Runtime::callee_save_methods_[kSaveRefsOnly].
// Note: We could avoid saving X20 in the case of Baker read
// barriers, as it is overwritten by REFRESH_MARKING_REGISTER
// later; but it's not worth handling this special case.
stp xIP0, x20, [sp]
.cfi_rel_offset x20, 8
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
// TODO: Probably no need to restore registers preserved by aapcs64.
.macro RESTORE_SAVE_REFS_ONLY_FRAME
// Callee-saves.
// Note: Likewise, we could avoid restoring X20 in the case of Baker
// read barriers, as it is overwritten by REFRESH_MARKING_REGISTER
// later; but it's not worth handling this special case.
RESTORE_REG x20, 8
RESTORE_TWO_REGS x21, x22, 16
RESTORE_TWO_REGS x23, x24, 32
RESTORE_TWO_REGS x25, x26, 48
RESTORE_TWO_REGS x27, x28, 64
RESTORE_TWO_REGS x29, xLR, 80
DECREASE_FRAME 96
.endm
.macro POP_SAVE_REFS_ONLY_FRAME
DECREASE_FRAME 96
.endm
.macro SETUP_SAVE_REFS_AND_ARGS_FRAME_INTERNAL
INCREASE_FRAME 224
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_REFS_AND_ARGS != 224)
#error "FRAME_SIZE_SAVE_REFS_AND_ARGS(ARM64) size not as expected."
#endif
// Stack alignment filler [sp, #8].
// FP args.
stp d0, d1, [sp, #16]
stp d2, d3, [sp, #32]
stp d4, d5, [sp, #48]
stp d6, d7, [sp, #64]
// Core args.
SAVE_TWO_REGS x1, x2, 80
SAVE_TWO_REGS x3, x4, 96
SAVE_TWO_REGS x5, x6, 112
// x7, Callee-saves.
// Note: We could avoid saving X20 in the case of Baker read
// barriers, as it is overwritten by REFRESH_MARKING_REGISTER
// later; but it's not worth handling this special case.
SAVE_TWO_REGS x7, x20, 128
SAVE_TWO_REGS x21, x22, 144
SAVE_TWO_REGS x23, x24, 160
SAVE_TWO_REGS x25, x26, 176
SAVE_TWO_REGS x27, x28, 192
// x29(callee-save) and LR.
SAVE_TWO_REGS x29, xLR, 208
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveRefsAndArgs).
*
* TODO This is probably too conservative - saving FP & LR.
*/
.macro SETUP_SAVE_REFS_AND_ARGS_FRAME
// art::Runtime** xIP0 = &art::Runtime::instance_
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // art::Runtime* xIP0 = art::Runtime::instance_;
// ArtMethod* xIP0 = Runtime::instance_->callee_save_methods_[kSaveRefAndArgs];
ldr xIP0, [xIP0, RUNTIME_SAVE_REFS_AND_ARGS_METHOD_OFFSET]
SETUP_SAVE_REFS_AND_ARGS_FRAME_INTERNAL
str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kSaveRefsAndArgs].
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
.macro SETUP_SAVE_REFS_AND_ARGS_FRAME_WITH_METHOD_IN_X0
SETUP_SAVE_REFS_AND_ARGS_FRAME_INTERNAL
str x0, [sp, #0] // Store ArtMethod* to bottom of stack.
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
// TODO: Probably no need to restore registers preserved by aapcs64.
.macro RESTORE_SAVE_REFS_AND_ARGS_FRAME
// FP args.
ldp d0, d1, [sp, #16]
ldp d2, d3, [sp, #32]
ldp d4, d5, [sp, #48]
ldp d6, d7, [sp, #64]
// Core args.
RESTORE_TWO_REGS x1, x2, 80
RESTORE_TWO_REGS x3, x4, 96
RESTORE_TWO_REGS x5, x6, 112
// x7, Callee-saves.
// Note: Likewise, we could avoid restoring X20 in the case of Baker
// read barriers, as it is overwritten by REFRESH_MARKING_REGISTER
// later; but it's not worth handling this special case.
RESTORE_TWO_REGS x7, x20, 128
RESTORE_TWO_REGS x21, x22, 144
RESTORE_TWO_REGS x23, x24, 160
RESTORE_TWO_REGS x25, x26, 176
RESTORE_TWO_REGS x27, x28, 192
// x29(callee-save) and LR.
RESTORE_TWO_REGS x29, xLR, 208
DECREASE_FRAME 224
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveEverything)
* when the SP has already been decremented by FRAME_SIZE_SAVE_EVERYTHING
* and saving registers x29 and LR is handled elsewhere.
*/
.macro SETUP_SAVE_EVERYTHING_FRAME_DECREMENTED_SP_SKIP_X29_LR runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_EVERYTHING != 512)
#error "FRAME_SIZE_SAVE_EVERYTHING(ARM64) size not as expected."
#endif
// Save FP registers.
// For better performance, store d0 and d31 separately, so that all STPs are 16-byte aligned.
str d0, [sp, #8]
stp d1, d2, [sp, #16]
stp d3, d4, [sp, #32]
stp d5, d6, [sp, #48]
stp d7, d8, [sp, #64]
stp d9, d10, [sp, #80]
stp d11, d12, [sp, #96]
stp d13, d14, [sp, #112]
stp d15, d16, [sp, #128]
stp d17, d18, [sp, #144]
stp d19, d20, [sp, #160]
stp d21, d22, [sp, #176]
stp d23, d24, [sp, #192]
stp d25, d26, [sp, #208]
stp d27, d28, [sp, #224]
stp d29, d30, [sp, #240]
str d31, [sp, #256]
// Save core registers.
SAVE_REG x0, 264
SAVE_TWO_REGS x1, x2, 272
SAVE_TWO_REGS x3, x4, 288
SAVE_TWO_REGS x5, x6, 304
SAVE_TWO_REGS x7, x8, 320
SAVE_TWO_REGS x9, x10, 336
SAVE_TWO_REGS x11, x12, 352
SAVE_TWO_REGS x13, x14, 368
SAVE_TWO_REGS x15, x16, 384
SAVE_TWO_REGS x17, x18, 400
SAVE_TWO_REGS x19, x20, 416
SAVE_TWO_REGS x21, x22, 432
SAVE_TWO_REGS x23, x24, 448
SAVE_TWO_REGS x25, x26, 464
SAVE_TWO_REGS x27, x28, 480
// art::Runtime** xIP0 = &art::Runtime::instance_
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
ldr xIP0, [xIP0] // art::Runtime* xIP0 = art::Runtime::instance_;
// ArtMethod* xIP0 = Runtime::instance_->callee_save_methods_[kSaveEverything];
ldr xIP0, [xIP0, \runtime_method_offset]
// Store ArtMethod* Runtime::callee_save_methods_[kSaveEverything].
str xIP0, [sp]
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveEverything)
*/
.macro SETUP_SAVE_EVERYTHING_FRAME runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
INCREASE_FRAME 512
SAVE_TWO_REGS x29, xLR, 496
SETUP_SAVE_EVERYTHING_FRAME_DECREMENTED_SP_SKIP_X29_LR \runtime_method_offset
.endm
.macro RESTORE_SAVE_EVERYTHING_FRAME_KEEP_X0
// Restore FP registers.
// For better performance, load d0 and d31 separately, so that all LDPs are 16-byte aligned.
ldr d0, [sp, #8]
ldp d1, d2, [sp, #16]
ldp d3, d4, [sp, #32]
ldp d5, d6, [sp, #48]
ldp d7, d8, [sp, #64]
ldp d9, d10, [sp, #80]
ldp d11, d12, [sp, #96]
ldp d13, d14, [sp, #112]
ldp d15, d16, [sp, #128]
ldp d17, d18, [sp, #144]
ldp d19, d20, [sp, #160]
ldp d21, d22, [sp, #176]
ldp d23, d24, [sp, #192]
ldp d25, d26, [sp, #208]
ldp d27, d28, [sp, #224]
ldp d29, d30, [sp, #240]
ldr d31, [sp, #256]
// Restore core registers, except x0.
RESTORE_TWO_REGS x1, x2, 272
RESTORE_TWO_REGS x3, x4, 288
RESTORE_TWO_REGS x5, x6, 304
RESTORE_TWO_REGS x7, x8, 320
RESTORE_TWO_REGS x9, x10, 336
RESTORE_TWO_REGS x11, x12, 352
RESTORE_TWO_REGS x13, x14, 368
RESTORE_TWO_REGS x15, x16, 384
RESTORE_TWO_REGS x17, x18, 400
RESTORE_TWO_REGS x19, x20, 416
RESTORE_TWO_REGS x21, x22, 432
RESTORE_TWO_REGS x23, x24, 448
RESTORE_TWO_REGS x25, x26, 464
RESTORE_TWO_REGS x27, x28, 480
RESTORE_TWO_REGS x29, xLR, 496
DECREASE_FRAME 512
.endm
.macro RESTORE_SAVE_EVERYTHING_FRAME
RESTORE_REG x0, 264
RESTORE_SAVE_EVERYTHING_FRAME_KEEP_X0
.endm
// Macro to refresh the Marking Register (W20).
//
// This macro must be called at the end of functions implementing
// entrypoints that possibly (directly or indirectly) perform a
// suspend check (before they return).
.macro REFRESH_MARKING_REGISTER
#if defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
ldr wMR, [xSELF, #THREAD_IS_GC_MARKING_OFFSET]
#endif
.endm
.macro RETURN_IF_RESULT_IS_ZERO
cbnz x0, 1f // result non-zero branch over
ret // return
1:
.endm
.macro RETURN_IF_RESULT_IS_NON_ZERO
cbz x0, 1f // result zero branch over
ret // return
1:
.endm
/*
* Macro that calls through to artDeliverPendingExceptionFromCode, where the pending
* exception is Thread::Current()->exception_ when the runtime method frame is ready.
*/
.macro DELIVER_PENDING_EXCEPTION_FRAME_READY
mov x0, xSELF
// Point of no return.
bl artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*)
brk 0 // Unreached
.endm
/*
* Macro that calls through to artDeliverPendingExceptionFromCode, where the pending
* exception is Thread::Current()->exception_.
*/
.macro DELIVER_PENDING_EXCEPTION
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME
DELIVER_PENDING_EXCEPTION_FRAME_READY
.endm
.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_REG reg
ldr \reg, [xSELF, # THREAD_EXCEPTION_OFFSET] // Get exception field.
cbnz \reg, 1f
ret
1:
DELIVER_PENDING_EXCEPTION
.endm
.macro RETURN_OR_DELIVER_PENDING_EXCEPTION
RETURN_OR_DELIVER_PENDING_EXCEPTION_REG xIP0
.endm
// Same as above with x1. This is helpful in stubs that want to avoid clobbering another register.
.macro RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
RETURN_OR_DELIVER_PENDING_EXCEPTION_REG x1
.endm
.macro RETURN_IF_W0_IS_ZERO_OR_DELIVER
cbnz w0, 1f // result non-zero branch over
ret // return
1:
DELIVER_PENDING_EXCEPTION
.endm
.macro NO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME // save all registers as basis for long jump context
mov x0, xSELF // pass Thread::Current
bl \cxx_name // \cxx_name(Thread*)
brk 0
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 // save all registers as basis for long jump context
mov x0, xSELF // pass Thread::Current
bl \cxx_name // \cxx_name(Thread*)
brk 0
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 // save all registers as basis for long jump context.
mov x1, xSELF // pass Thread::Current.
bl \cxx_name // \cxx_name(arg, Thread*).
brk 0
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 // save all registers as basis for long jump context
mov x2, xSELF // pass Thread::Current
bl \cxx_name // \cxx_name(arg1, arg2, Thread*)
brk 0
END \c_name
.endm
/*
* Called by managed code, saves callee saves and then calls artThrowException
* that will place a mock Method* at the bottom of the stack. Arg1 holds the exception.
*/
ONE_ARG_RUNTIME_EXCEPTION art_quick_deliver_exception, artDeliverExceptionFromCode
/*
* Called by managed code to create and deliver a NullPointerException.
*/
NO_ARG_RUNTIME_EXCEPTION_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
// Save all registers as basis for long jump context.
INCREASE_FRAME (FRAME_SIZE_SAVE_EVERYTHING - __SIZEOF_POINTER__)
SAVE_REG x29, (FRAME_SIZE_SAVE_EVERYTHING - 2 * __SIZEOF_POINTER__) // LR already saved.
SETUP_SAVE_EVERYTHING_FRAME_DECREMENTED_SP_SKIP_X29_LR
mov x0, lr // pass the fault address stored in LR by the fault handler.
mov x1, xSELF // pass Thread::Current.
bl artThrowNullPointerExceptionFromSignal // (arg, Thread*).
brk 0
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/x0 with the target Method*, arg0/x0 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/x1.
*
* The helper will attempt to locate the target and return a 128-bit result in x0/x1 consisting
* of the target Method* in x0 and method->code_ in x1.
*
* If unsuccessful, the helper will return null/????. There will be a pending exception in the
* thread and we branch to another stub to deliver it.
*
* On success this wrapper will restore arguments and *jump* to the target, leaving the lr
* pointing back to the original caller.
*
* Adapted from ARM32 code.
*
* Clobbers xIP0.
*/
.macro INVOKE_TRAMPOLINE_BODY cxx_name
.extern \cxx_name
SETUP_SAVE_REFS_AND_ARGS_FRAME // save callee saves in case allocation triggers GC
// Helper signature is always
// (method_idx, *this_object, *caller_method, *self, sp)
mov x2, xSELF // pass Thread::Current
mov x3, sp
bl \cxx_name // (method_idx, this, Thread*, SP)
mov xIP0, x1 // save Method*->code_
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
cbz x0, 1f // did we find the target? if not go to exception delivery
br xIP0 // 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
.macro INVOKE_STUB_CREATE_FRAME
SAVE_SIZE=15*8 // x4, x5, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, SP, LR, FP saved.
SAVE_SIZE_AND_METHOD=SAVE_SIZE+8
mov x9, sp // Save stack pointer.
.cfi_register sp,x9
add x10, x2, # SAVE_SIZE_AND_METHOD // calculate size of frame.
sub x10, sp, x10 // Calculate SP position - saves + ArtMethod* + args
and x10, x10, # ~0xf // Enforce 16 byte stack alignment.
mov sp, x10 // Set new SP.
sub x10, x9, #SAVE_SIZE // Calculate new FP (later). Done here as we must move SP
.cfi_def_cfa_register x10 // before this.
.cfi_adjust_cfa_offset SAVE_SIZE
str x28, [x10, #112]
.cfi_rel_offset x28, 112
stp x26, x27, [x10, #96]
.cfi_rel_offset x26, 96
.cfi_rel_offset x27, 104
stp x24, x25, [x10, #80]
.cfi_rel_offset x24, 80
.cfi_rel_offset x25, 88
stp x22, x23, [x10, #64]
.cfi_rel_offset x22, 64
.cfi_rel_offset x23, 72
stp x20, x21, [x10, #48]
.cfi_rel_offset x20, 48
.cfi_rel_offset x21, 56
stp x9, x19, [x10, #32] // Save old stack pointer and x19.
.cfi_rel_offset sp, 32
.cfi_rel_offset x19, 40
stp x4, x5, [x10, #16] // Save result and shorty addresses.
.cfi_rel_offset x4, 16
.cfi_rel_offset x5, 24
stp xFP, xLR, [x10] // Store LR & FP.
.cfi_rel_offset x29, 0
.cfi_rel_offset x30, 8
mov xFP, x10 // Use xFP now, as it's callee-saved.
.cfi_def_cfa_register x29
mov xSELF, x3 // Move thread pointer into SELF register.
// Copy arguments into stack frame.
// Use simple copy routine for now.
// 4 bytes per slot.
// X1 - source address
// W2 - args length
// X9 - destination address.
// W10 - temporary
add x9, sp, #8 // Destination address is bottom of stack + null.
// Copy parameters into the stack. Use numeric label as this is a macro and Clang's assembler
// does not have unique-id variables.
1:
cmp w2, #0
beq 2f
sub w2, w2, #4 // Need 65536 bytes of range.
ldr w10, [x1, x2]
str w10, [x9, x2]
b 1b
2:
// Store null into ArtMethod* at bottom of frame.
str xzr, [sp]
.endm
.macro INVOKE_STUB_CALL_AND_RETURN
REFRESH_MARKING_REGISTER
// load method-> METHOD_QUICK_CODE_OFFSET
ldr x9, [x0, #ART_METHOD_QUICK_CODE_OFFSET_64]
// Branch to method.
blr x9
// Restore return value address and shorty address.
ldp x4, x5, [xFP, #16]
.cfi_restore x4
.cfi_restore x5
ldr x28, [xFP, #112]
.cfi_restore x28
ldp x26, x27, [xFP, #96]
.cfi_restore x26
.cfi_restore x27
ldp x24, x25, [xFP, #80]
.cfi_restore x24
.cfi_restore x25
ldp x22, x23, [xFP, #64]
.cfi_restore x22
.cfi_restore x23
ldp x20, x21, [xFP, #48]
.cfi_restore x20
.cfi_restore x21
// Store result (w0/x0/s0/d0) appropriately, depending on resultType.
ldrb w10, [x5]
// Check the return type and store the correct register into the jvalue in memory.
// Use numeric label as this is a macro and Clang's assembler does not have unique-id variables.
// Don't set anything for a void type.
cmp w10, #'V'
beq 3f
// Is it a double?
cmp w10, #'D'
bne 1f
str d0, [x4]
b 3f
1: // Is it a float?
cmp w10, #'F'
bne 2f
str s0, [x4]
b 3f
2: // Just store x0. Doesn't matter if it is 64 or 32 bits.
str x0, [x4]
3: // Finish up.
ldp x2, x19, [xFP, #32] // Restore stack pointer and x19.
.cfi_restore x19
mov sp, x2
.cfi_restore sp
ldp xFP, xLR, [xFP] // Restore old frame pointer and link register.
.cfi_restore x29
.cfi_restore x30
ret
.endm
/*
* extern"C" void art_quick_invoke_stub(ArtMethod *method, x0
* uint32_t *args, x1
* uint32_t argsize, w2
* Thread *self, x3
* JValue *result, x4
* char *shorty); x5
* +----------------------+
* | |
* | C/C++ frame |
* | LR'' |
* | FP'' | <- SP'
* +----------------------+
* +----------------------+
* | x28 | <- TODO: Remove callee-saves.
* | : |
* | x19 |
* | SP' |
* | X5 |
* | X4 | Saved registers
* | LR' |
* | FP' | <- FP
* +----------------------+
* | uint32_t out[n-1] |
* | : : | Outs
* | uint32_t out[0] |
* | ArtMethod* | <- SP value=null
* +----------------------+
*
* Outgoing registers:
* x0 - Method*
* x1-x7 - integer parameters.
* d0-d7 - Floating point parameters.
* xSELF = self
* SP = & of ArtMethod*
* x1 = "this" pointer.
*
*/
ENTRY art_quick_invoke_stub
// Spill registers as per AACPS64 calling convention.
INVOKE_STUB_CREATE_FRAME
// Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters.
// Parse the passed shorty to determine which register to load.
// Load addresses for routines that load WXSD registers.
adr x11, .LstoreW2
adr x12, .LstoreX2
adr x13, .LstoreS0
adr x14, .LstoreD0
// Initialize routine offsets to 0 for integers and floats.
// x8 for integers, x15 for floating point.
mov x8, #0
mov x15, #0
add x10, x5, #1 // Load shorty address, plus one to skip return value.
ldr w1, [x9],#4 // Load "this" parameter, and increment arg pointer.
// Loop to fill registers.
.LfillRegisters:
ldrb w17, [x10], #1 // Load next character in signature, and increment.
cbz w17, .LcallFunction // Exit at end of signature. Shorty 0 terminated.
cmp w17, #'F' // is this a float?
bne .LisDouble
cmp x15, # 8*12 // Skip this load if all registers full.
beq .Ladvance4
add x17, x13, x15 // Calculate subroutine to jump to.
br x17
.LisDouble:
cmp w17, #'D' // is this a double?
bne .LisLong
cmp x15, # 8*12 // Skip this load if all registers full.
beq .Ladvance8
add x17, x14, x15 // Calculate subroutine to jump to.
br x17
.LisLong:
cmp w17, #'J' // is this a long?
bne .LisOther
cmp x8, # 6*12 // Skip this load if all registers full.
beq .Ladvance8
add x17, x12, x8 // Calculate subroutine to jump to.
br x17
.LisOther: // Everything else takes one vReg.
cmp x8, # 6*12 // Skip this load if all registers full.
beq .Ladvance4
add x17, x11, x8 // Calculate subroutine to jump to.
br x17
.Ladvance4:
add x9, x9, #4
b .LfillRegisters
.Ladvance8:
add x9, x9, #8
b .LfillRegisters
// Macro for loading a parameter into a register.
// counter - the register with offset into these tables
// size - the size of the register - 4 or 8 bytes.
// register - the name of the register to be loaded.
.macro LOADREG counter size register return
ldr \register , [x9], #\size
add \counter, \counter, 12
b \return
.endm
// Store ints.
.LstoreW2:
LOADREG x8 4 w2 .LfillRegisters
LOADREG x8 4 w3 .LfillRegisters
LOADREG x8 4 w4 .LfillRegisters
LOADREG x8 4 w5 .LfillRegisters
LOADREG x8 4 w6 .LfillRegisters
LOADREG x8 4 w7 .LfillRegisters
// Store longs.
.LstoreX2:
LOADREG x8 8 x2 .LfillRegisters
LOADREG x8 8 x3 .LfillRegisters
LOADREG x8 8 x4 .LfillRegisters
LOADREG x8 8 x5 .LfillRegisters
LOADREG x8 8 x6 .LfillRegisters
LOADREG x8 8 x7 .LfillRegisters
// Store singles.
.LstoreS0:
LOADREG x15 4 s0 .LfillRegisters
LOADREG x15 4 s1 .LfillRegisters
LOADREG x15 4 s2 .LfillRegisters
LOADREG x15 4 s3 .LfillRegisters
LOADREG x15 4 s4 .LfillRegisters
LOADREG x15 4 s5 .LfillRegisters
LOADREG x15 4 s6 .LfillRegisters
LOADREG x15 4 s7 .LfillRegisters
// Store doubles.
.LstoreD0:
LOADREG x15 8 d0 .LfillRegisters
LOADREG x15 8 d1 .LfillRegisters
LOADREG x15 8 d2 .LfillRegisters
LOADREG x15 8 d3 .LfillRegisters
LOADREG x15 8 d4 .LfillRegisters
LOADREG x15 8 d5 .LfillRegisters
LOADREG x15 8 d6 .LfillRegisters
LOADREG x15 8 d7 .LfillRegisters
.LcallFunction:
INVOKE_STUB_CALL_AND_RETURN
END art_quick_invoke_stub
/* extern"C"
* void art_quick_invoke_static_stub(ArtMethod *method, x0
* uint32_t *args, x1
* uint32_t argsize, w2
* Thread *self, x3
* JValue *result, x4
* char *shorty); x5
*/
ENTRY art_quick_invoke_static_stub
// Spill registers as per AACPS64 calling convention.
INVOKE_STUB_CREATE_FRAME
// Fill registers x/w1 to x/w7 and s/d0 to s/d7 with parameters.
// Parse the passed shorty to determine which register to load.
// Load addresses for routines that load WXSD registers.
adr x11, .LstoreW1_2
adr x12, .LstoreX1_2
adr x13, .LstoreS0_2
adr x14, .LstoreD0_2
// Initialize routine offsets to 0 for integers and floats.
// x8 for integers, x15 for floating point.
mov x8, #0
mov x15, #0
add x10, x5, #1 // Load shorty address, plus one to skip return value.
// Loop to fill registers.
.LfillRegisters2:
ldrb w17, [x10], #1 // Load next character in signature, and increment.
cbz w17, .LcallFunction2 // Exit at end of signature. Shorty 0 terminated.
cmp w17, #'F' // is this a float?
bne .LisDouble2
cmp x15, # 8*12 // Skip this load if all registers full.
beq .Ladvance4_2
add x17, x13, x15 // Calculate subroutine to jump to.
br x17
.LisDouble2:
cmp w17, #'D' // is this a double?
bne .LisLong2
cmp x15, # 8*12 // Skip this load if all registers full.
beq .Ladvance8_2
add x17, x14, x15 // Calculate subroutine to jump to.
br x17
.LisLong2:
cmp w17, #'J' // is this a long?
bne .LisOther2
cmp x8, # 7*12 // Skip this load if all registers full.
beq .Ladvance8_2
add x17, x12, x8 // Calculate subroutine to jump to.
br x17
.LisOther2: // Everything else takes one vReg.
cmp x8, # 7*12 // Skip this load if all registers full.
beq .Ladvance4_2
add x17, x11, x8 // Calculate subroutine to jump to.
br x17
.Ladvance4_2:
add x9, x9, #4
b .LfillRegisters2
.Ladvance8_2:
add x9, x9, #8
b .LfillRegisters2
// Store ints.
.LstoreW1_2:
LOADREG x8 4 w1 .LfillRegisters2
LOADREG x8 4 w2 .LfillRegisters2
LOADREG x8 4 w3 .LfillRegisters2
LOADREG x8 4 w4 .LfillRegisters2
LOADREG x8 4 w5 .LfillRegisters2
LOADREG x8 4 w6 .LfillRegisters2
LOADREG x8 4 w7 .LfillRegisters2
// Store longs.
.LstoreX1_2:
LOADREG x8 8 x1 .LfillRegisters2
LOADREG x8 8 x2 .LfillRegisters2
LOADREG x8 8 x3 .LfillRegisters2
LOADREG x8 8 x4 .LfillRegisters2
LOADREG x8 8 x5 .LfillRegisters2
LOADREG x8 8 x6 .LfillRegisters2
LOADREG x8 8 x7 .LfillRegisters2
// Store singles.
.LstoreS0_2:
LOADREG x15 4 s0 .LfillRegisters2
LOADREG x15 4 s1 .LfillRegisters2
LOADREG x15 4 s2 .LfillRegisters2
LOADREG x15 4 s3 .LfillRegisters2
LOADREG x15 4 s4 .LfillRegisters2
LOADREG x15 4 s5 .LfillRegisters2
LOADREG x15 4 s6 .LfillRegisters2
LOADREG x15 4 s7 .LfillRegisters2
// Store doubles.
.LstoreD0_2:
LOADREG x15 8 d0 .LfillRegisters2
LOADREG x15 8 d1 .LfillRegisters2
LOADREG x15 8 d2 .LfillRegisters2
LOADREG x15 8 d3 .LfillRegisters2
LOADREG x15 8 d4 .LfillRegisters2
LOADREG x15 8 d5 .LfillRegisters2
LOADREG x15 8 d6 .LfillRegisters2
LOADREG x15 8 d7 .LfillRegisters2
.LcallFunction2:
INVOKE_STUB_CALL_AND_RETURN
END art_quick_invoke_static_stub
/* extern"C" void art_quick_osr_stub(void** stack, x0
* size_t stack_size_in_bytes, x1
* const uin8_t* native_pc, x2
* JValue *result, x3
* char *shorty, x4
* Thread *self) x5
*/
ENTRY art_quick_osr_stub
SAVE_SIZE=15*8 // x3, x4, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, SP, LR, FP saved.
mov x9, sp // Save stack pointer.
.cfi_register sp,x9
sub x10, sp, # SAVE_SIZE
and x10, x10, # ~0xf // Enforce 16 byte stack alignment.
mov sp, x10 // Set new SP.
str x28, [sp, #112]
stp x26, x27, [sp, #96]
stp x24, x25, [sp, #80]
stp x22, x23, [sp, #64]
stp x20, x21, [sp, #48]
stp x9, x19, [sp, #32] // Save old stack pointer and x19.
stp x3, x4, [sp, #16] // Save result and shorty addresses.
stp xFP, xLR, [sp] // Store LR & FP.
mov xSELF, x5 // Move thread pointer into SELF register.
REFRESH_MARKING_REGISTER
sub sp, sp, #16
str xzr, [sp] // Store null for ArtMethod* slot
// Branch to stub.
bl .Losr_entry
add sp, sp, #16
// Restore return value address and shorty address.
ldp x3,x4, [sp, #16]
ldr x28, [sp, #112]
ldp x26, x27, [sp, #96]
ldp x24, x25, [sp, #80]
ldp x22, x23, [sp, #64]
ldp x20, x21, [sp, #48]
// Store result (w0/x0/s0/d0) appropriately, depending on resultType.
ldrb w10, [x4]
// Check the return type and store the correct register into the jvalue in memory.
// Don't set anything for a void type.
cmp w10, #'V'
beq .Losr_exit
// Is it a double?
cmp w10, #'D'
bne .Lno_double
str d0, [x3]
b .Losr_exit
.Lno_double: // Is it a float?
cmp w10, #'F'
bne .Lno_float
str s0, [x3]
b .Losr_exit
.Lno_float: // Just store x0. Doesn't matter if it is 64 or 32 bits.
str x0, [x3]
.Losr_exit: // Finish up.
ldp x2, x19, [sp, #32] // Restore stack pointer and x19.
ldp xFP, xLR, [sp] // Restore old frame pointer and link register.
mov sp, x2
ret
.Losr_entry:
// Update stack pointer for the callee
sub sp, sp, x1
// Update link register slot expected by the callee.
sub w1, w1, #8
str lr, [sp, x1]
// Copy arguments into stack frame.
// Use simple copy routine for now.
// 4 bytes per slot.
// X0 - source address
// W1 - args length
// SP - destination address.
// W10 - temporary
.Losr_loop_entry:
cmp w1, #0
beq .Losr_loop_exit
sub w1, w1, #4
ldr w10, [x0, x1]
str w10, [sp, x1]
b .Losr_loop_entry
.Losr_loop_exit:
// Branch to the OSR entry point.
br x2
END art_quick_osr_stub
/*
* On entry x0 is uintptr_t* gprs_ and x1 is uint64_t* fprs_
*/
ENTRY art_quick_do_long_jump
// Load FPRs
ldp d0, d1, [x1], #16
ldp d2, d3, [x1], #16
ldp d4, d5, [x1], #16
ldp d6, d7, [x1], #16
ldp d8, d9, [x1], #16
ldp d10, d11, [x1], #16
ldp d12, d13, [x1], #16
ldp d14, d15, [x1], #16
ldp d16, d17, [x1], #16
ldp d18, d19, [x1], #16
ldp d20, d21, [x1], #16
ldp d22, d23, [x1], #16
ldp d24, d25, [x1], #16
ldp d26, d27, [x1], #16
ldp d28, d29, [x1], #16
ldp d30, d31, [x1]
// Load GPRs
// TODO: lots of those are smashed, could optimize.
add x0, x0, #30*8
ldp x30, x1, [x0], #-16 // LR & SP
ldp x28, x29, [x0], #-16
ldp x26, x27, [x0], #-16
ldp x24, x25, [x0], #-16
ldp x22, x23, [x0], #-16
ldp x20, x21, [x0], #-16
ldp x18, x19, [x0], #-16 // X18 & xSELF
ldp x16, x17, [x0], #-16
ldp x14, x15, [x0], #-16
ldp x12, x13, [x0], #-16
ldp x10, x11, [x0], #-16
ldp x8, x9, [x0], #-16
ldp x6, x7, [x0], #-16
ldp x4, x5, [x0], #-16
ldp x2, x3, [x0], #-16
mov sp, x1
REFRESH_MARKING_REGISTER
// Need to load PC, it's at the end (after the space for the unused XZR). Use x1.
ldr x1, [x0, #33*8]
// And the value of x0.
ldr x0, [x0]
br x1
END art_quick_do_long_jump
/*
* Entry from managed code that calls artLockObjectFromCode, may block for GC. x0 holds the
* possibly null object to lock.
*
* Derived from arm32 code.
*/
.extern artLockObjectFromCode
ENTRY art_quick_lock_object
cbz w0, .Lslow_lock
add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore
.Lretry_lock:
ldr w2, [xSELF, #THREAD_ID_OFFSET] // TODO: Can the thread ID really change during the loop?
ldaxr w1, [x4] // acquire needed only in most common case
and w3, w1, #LOCK_WORD_GC_STATE_MASK_SHIFTED_TOGGLED // zero the gc bits
cbnz w3, .Lnot_unlocked // already thin locked
// unlocked case - x1: original lock word that's zero except for the read barrier bits.
orr x2, x1, x2 // x2 holds thread id with count of 0 with preserved read barrier bits
stxr w3, w2, [x4]
cbnz w3, .Llock_stxr_fail // store failed, retry
ret
.Lnot_unlocked: // x1: original lock word
lsr w3, w1, LOCK_WORD_STATE_SHIFT
cbnz w3, .Lslow_lock // if either of the top two bits are set, go slow path
eor w2, w1, w2 // lock_word.ThreadId() ^ self->ThreadId()
uxth w2, w2 // zero top 16 bits
cbnz w2, .Lslow_lock // lock word and self thread id's match -> recursive lock
// else contention, go to slow path
and w3, w1, #LOCK_WORD_GC_STATE_MASK_SHIFTED_TOGGLED // zero the gc bits.
add w2, w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count in lock word placing in w2 to check overflow
lsr w3, w2, #LOCK_WORD_GC_STATE_SHIFT // if the first gc state bit is set, we overflowed.
cbnz w3, .Lslow_lock // if we overflow the count go slow path
add w2, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // increment count for real
stxr w3, w2, [x4]
cbnz w3, .Llock_stxr_fail // store failed, retry
ret
.Llock_stxr_fail:
b .Lretry_lock // retry
.Lslow_lock:
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case we block
mov x1, xSELF // pass Thread::Current
bl artLockObjectFromCode // (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_lock_object
ENTRY art_quick_lock_object_no_inline
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case we block
mov x1, xSELF // pass Thread::Current
bl artLockObjectFromCode // (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_lock_object_no_inline
/*
* Entry from managed code that calls artUnlockObjectFromCode and delivers exception on failure.
* x0 holds the possibly null object to lock.
*
* Derived from arm32 code.
*/
.extern artUnlockObjectFromCode
ENTRY art_quick_unlock_object
cbz x0, .Lslow_unlock
add x4, x0, #MIRROR_OBJECT_LOCK_WORD_OFFSET // exclusive load/store has no immediate anymore
.Lretry_unlock:
#ifndef USE_READ_BARRIER
ldr w1, [x4]
#else
ldxr w1, [x4] // Need to use atomic instructions for read barrier
#endif
lsr w2, w1, LOCK_WORD_STATE_SHIFT
cbnz w2, .Lslow_unlock // if either of the top two bits are set, go slow path
ldr w2, [xSELF, #THREAD_ID_OFFSET]
and w3, w1, #LOCK_WORD_GC_STATE_MASK_SHIFTED_TOGGLED // zero the gc bits
eor w3, w3, w2 // lock_word.ThreadId() ^ self->ThreadId()
uxth w3, w3 // zero top 16 bits
cbnz w3, .Lslow_unlock // do lock word and self thread id's match?
and w3, w1, #LOCK_WORD_GC_STATE_MASK_SHIFTED_TOGGLED // zero the gc bits
cmp w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE
bpl .Lrecursive_thin_unlock
// transition to unlocked
and w3, w1, #LOCK_WORD_GC_STATE_MASK_SHIFTED // w3: zero except for the preserved read barrier bits
#ifndef USE_READ_BARRIER
stlr w3, [x4]
#else
stlxr w2, w3, [x4] // Need to use atomic instructions for read barrier
cbnz w2, .Lunlock_stxr_fail // store failed, retry
#endif
ret
.Lrecursive_thin_unlock: // w1: original lock word
sub w1, w1, #LOCK_WORD_THIN_LOCK_COUNT_ONE // decrement count
#ifndef USE_READ_BARRIER
str w1, [x4]
#else
stxr w2, w1, [x4] // Need to use atomic instructions for read barrier
cbnz w2, .Lunlock_stxr_fail // store failed, retry
#endif
ret
.Lunlock_stxr_fail:
b .Lretry_unlock // retry
.Lslow_unlock:
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case exception allocation triggers GC
mov x1, xSELF // pass Thread::Current
bl artUnlockObjectFromCode // (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_unlock_object
ENTRY art_quick_unlock_object_no_inline
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case exception allocation triggers GC
mov x1, xSELF // pass Thread::Current
bl artUnlockObjectFromCode // (Object* obj, Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
RETURN_IF_W0_IS_ZERO_OR_DELIVER
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
// Store arguments and link register
// Stack needs to be 16B aligned on calls.
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, 32
SAVE_REG xLR, 24
// Call runtime code
bl artInstanceOfFromCode
// Check for exception
cbz x0, .Lthrow_class_cast_exception
// Restore and return
.cfi_remember_state
RESTORE_REG xLR, 24
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, 32
ret
.cfi_restore_state // Reset unwind info so following code unwinds.
.cfi_def_cfa_offset 32 // workaround for clang bug: 31975598
.Lthrow_class_cast_exception:
// Restore
RESTORE_REG xLR, 24
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, 32
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME // save all registers as basis for long jump context
mov x2, xSELF // pass Thread::Current
bl artThrowClassCastExceptionForObject // (Object*, Class*, Thread*)
brk 0 // We should not return here...
END art_quick_check_instance_of
// Restore xReg's value from [sp, #offset] if xReg is not the same as xExclude.
.macro POP_REG_NE xReg, offset, xExclude
.ifnc \xReg, \xExclude
ldr \xReg, [sp, #\offset] // restore xReg
.cfi_restore \xReg
.endif
.endm
// Restore xReg1's value from [sp, #offset] if xReg1 is not the same as xExclude.
// Restore xReg2's value from [sp, #(offset + 8)] if xReg2 is not the same as xExclude.
.macro POP_REGS_NE xReg1, xReg2, offset, xExclude
.ifc \xReg1, \xExclude
ldr \xReg2, [sp, #(\offset + 8)] // restore xReg2
.else
.ifc \xReg2, \xExclude
ldr \xReg1, [sp, #\offset] // restore xReg1
.else
ldp \xReg1, \xReg2, [sp, #\offset] // restore xReg1 and xReg2
.endif
.endif
.cfi_restore \xReg1
.cfi_restore \xReg2
.endm
/*
* Macro to insert read barrier, only used in art_quick_aput_obj.
* xDest, wDest and xObj are registers, offset is a defined literal such as
* MIRROR_OBJECT_CLASS_OFFSET. Dest needs both x and w versions of the same register to handle
* name mismatch between instructions. This macro uses the lower 32b of register when possible.
* TODO: When read barrier has a fast path, add heap unpoisoning support for the fast path.
*/
.macro READ_BARRIER xDest, wDest, xObj, xTemp, wTemp, offset, number
#ifdef USE_READ_BARRIER
# ifdef USE_BAKER_READ_BARRIER
ldr \wTemp, [\xObj, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
tbnz \wTemp, #LOCK_WORD_READ_BARRIER_STATE_SHIFT, .Lrb_slowpath\number
// False dependency to avoid needing load/load fence.
add \xObj, \xObj, \xTemp, lsr #32
ldr \wDest, [\xObj, #\offset] // Heap reference = 32b. This also zero-extends to \xDest.
UNPOISON_HEAP_REF \wDest
b .Lrb_exit\number
# endif // USE_BAKER_READ_BARRIER
.Lrb_slowpath\number:
// Store registers used in art_quick_aput_obj (x0-x4, LR), stack is 16B aligned.
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, 48
SAVE_TWO_REGS x2, x3, 16
SAVE_TWO_REGS x4, xLR, 32
// mov x0, \xRef // pass ref in x0 (no-op for now since parameter ref is unused)
.ifnc \xObj, x1
mov x1, \xObj // pass xObj
.endif
mov w2, #\offset // pass offset
bl artReadBarrierSlow // artReadBarrierSlow(ref, xObj, offset)
// No need to unpoison return value in w0, artReadBarrierSlow() would do the unpoisoning.
.ifnc \wDest, w0
mov \wDest, w0 // save return value in wDest
.endif
// Conditionally restore saved registers
POP_REG_NE x0, 0, \xDest
POP_REG_NE x1, 8, \xDest
POP_REG_NE x2, 16, \xDest
POP_REG_NE x3, 24, \xDest
POP_REG_NE x4, 32, \xDest
RESTORE_REG xLR, 40
DECREASE_FRAME 48
.Lrb_exit\number:
#else
ldr \wDest, [\xObj, #\offset] // Heap reference = 32b. This also zero-extends to \xDest.
UNPOISON_HEAP_REF \wDest
#endif // USE_READ_BARRIER
.endm
#ifdef USE_READ_BARRIER
.extern artReadBarrierSlow
#endif
ENTRY art_quick_aput_obj
cbz x2, .Ldo_aput_null
READ_BARRIER x3, w3, x0, x3, w3, MIRROR_OBJECT_CLASS_OFFSET, 0 // Heap reference = 32b
// This also zero-extends to x3
READ_BARRIER x3, w3, x3, x4, w4, MIRROR_CLASS_COMPONENT_TYPE_OFFSET, 1 // Heap reference = 32b
// This also zero-extends to x3
READ_BARRIER x4, w4, x2, x4, w4, MIRROR_OBJECT_CLASS_OFFSET, 2 // Heap reference = 32b
// This also zero-extends to x4
cmp w3, w4 // value's type == array's component type - trivial assignability
bne .Lcheck_assignability
.Ldo_aput:
add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
// "Compress" = do nothing
POISON_HEAP_REF w2
str w2, [x3, x1, lsl #2] // Heap reference = 32b
ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET]
lsr x0, x0, #CARD_TABLE_CARD_SHIFT
strb w3, [x3, x0]
ret
.Ldo_aput_null:
add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
// "Compress" = do nothing
str w2, [x3, x1, lsl #2] // Heap reference = 32b
ret
.Lcheck_assignability:
// Store arguments and link register
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, 32
SAVE_TWO_REGS x2, xLR, 16
// Call runtime code
mov x0, x3 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended
mov x1, x4 // Heap reference, 32b, "uncompress" = do nothing, already zero-extended
bl artIsAssignableFromCode
// Check for exception
cbz x0, .Lthrow_array_store_exception
// Restore
.cfi_remember_state
RESTORE_TWO_REGS x2, xLR, 16
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, 32
add x3, x0, #MIRROR_OBJECT_ARRAY_DATA_OFFSET
// "Compress" = do nothing
POISON_HEAP_REF w2
str w2, [x3, x1, lsl #2] // Heap reference = 32b
ldr x3, [xSELF, #THREAD_CARD_TABLE_OFFSET]
lsr x0, x0, #CARD_TABLE_CARD_SHIFT
strb w3, [x3, x0]
ret
.cfi_restore_state // Reset unwind info so following code unwinds.
.cfi_def_cfa_offset 32 // workaround for clang bug: 31975598
.Lthrow_array_store_exception:
RESTORE_TWO_REGS x2, xLR, 16
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, 32
SETUP_SAVE_ALL_CALLEE_SAVES_FRAME
mov x1, x2 // Pass value.
mov x2, xSELF // Pass Thread::Current.
bl artThrowArrayStoreException // (Object*, Object*, Thread*).
brk 0 // 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 // save callee saves in case of GC
mov x1, xSELF // 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 // save callee saves in case of GC
mov x2, xSELF // 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 THREE_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case of GC
mov x3, xSELF // pass Thread::Current
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 // save callee saves in case of GC
mov x4, xSELF // pass Thread::Current
bl \entrypoint //
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.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 // save callee saves in case of GC
mov x1, xSELF // pass Thread::Current
bl \entrypoint // (uint32_t type_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 // save callee saves in case of GC
mov x2, xSELF // pass Thread::Current
bl \entrypoint
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 // save callee saves in case of GC
mov x3, xSELF // pass Thread::Current
bl \entrypoint
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
\return
END \name
.endm
// Macro for string and type resolution and initialization.
.macro ONE_ARG_SAVE_EVERYTHING_DOWNCALL name, entrypoint, runtime_method_offset = RUNTIME_SAVE_EVERYTHING_METHOD_OFFSET
.extern \entrypoint
ENTRY \name
SETUP_SAVE_EVERYTHING_FRAME \runtime_method_offset // save everything for stack crawl
mov x1, xSELF // pass Thread::Current
bl \entrypoint // (int32_t index, Thread* self)
cbz w0, 1f // If result is null, deliver the OOME.
.cfi_remember_state
RESTORE_SAVE_EVERYTHING_FRAME_KEEP_X0
REFRESH_MARKING_REGISTER
ret // return
.cfi_restore_state
.cfi_def_cfa_offset FRAME_SIZE_SAVE_EVERYTHING // workaround for clang bug: 31975598
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
.macro RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
cbz w0, 1f // result zero branch over
ret // return
1:
DELIVER_PENDING_EXCEPTION
.endm
/*
* Entry from managed code that calls artHandleFillArrayDataFromCode and delivers exception on
* failure.
*/
TWO_ARG_REF_DOWNCALL art_quick_handle_fill_data, artHandleFillArrayDataFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
/*
* Entry from managed code when uninitialized static storage, this stub will run the class
* initializer and deliver the exception on error. On success the static storage base is
* returned.
*/
ONE_ARG_SAVE_EVERYTHING_DOWNCALL_FOR_CLINIT art_quick_initialize_static_storage, artInitializeStaticStorageFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL_FOR_CLINIT art_quick_initialize_type, artInitializeTypeFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode
ONE_ARG_SAVE_EVERYTHING_DOWNCALL art_quick_resolve_string, artResolveStringFromCode
// Note: Functions `art{Get,Set}<Kind>{Static,Instance>FromCompiledCode` are
// defined by macros in runtime/entrypoints/quick/quick_field_entrypoints.cc.
ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCompiledCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set64_static, artSet64StaticFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCompiledCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
// Generate the allocation entrypoints for each allocator.
GENERATE_ALLOC_ENTRYPOINTS_FOR_NON_TLAB_ALLOCATORS
// Comment out allocators that have arm64 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_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_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)
// 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.
// x0: type, xSELF(x19): Thread::Current
// x1-x7: free.
ldr x3, [xSELF, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET] // Check if the thread local
// allocation stack has room.
// ldp won't work due to large offset.
ldr x4, [xSELF, #THREAD_LOCAL_ALLOC_STACK_END_OFFSET]
cmp x3, x4
bhs .Lslow_path\c_name
ldr w3, [x0, #MIRROR_CLASS_OBJECT_SIZE_ALLOC_FAST_PATH_OFFSET] // Load the object size (x3)
cmp x3, #ROSALLOC_MAX_THREAD_LOCAL_BRACKET_SIZE // Check if the size is for a thread
// local allocation. Also does the
// finalizable and initialization
// checks.
// When isInitialized == 0, then the class is potentially not yet initialized.
// If the class is not yet initialized, the object size will be very large to force the branch
// below to be taken.
//
// See InitializeClassVisitors in class-inl.h 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 x4, xSELF, x3, 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.
ldr x4, [x4, #(THREAD_ROSALLOC_RUNS_OFFSET - __SIZEOF_POINTER__)]
// Load the free list head (x3). This
// will be the return val.
ldr x3, [x4, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_HEAD_OFFSET)]
cbz x3, .Lslow_path\c_name
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber x0 and x1.
ldr x1, [x3, #ROSALLOC_SLOT_NEXT_OFFSET] // Load the next pointer of the head
// and update the list head with the
// next pointer.
str x1, [x4, #(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 w0
str w0, [x3, #MIRROR_OBJECT_CLASS_OFFSET]
// Push the new object onto the thread
// local allocation stack and
// increment the thread local
// allocation stack top.
ldr x1, [xSELF, #THREAD_LOCAL_ALLOC_STACK_TOP_OFFSET]
str w3, [x1], #COMPRESSED_REFERENCE_SIZE // (Increment x1 as a side effect.)
str x1, [xSELF, #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 w1, [x4, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_SIZE_OFFSET)]
sub x1, x1, #1
// TODO: consider combining this store
// and the list head store above using
// strd.
str w1, [x4, #(ROSALLOC_RUN_FREE_LIST_OFFSET + ROSALLOC_RUN_FREE_LIST_SIZE_OFFSET)]
mov x0, x3 // Set the return value and return.
.if \isInitialized == 0
// This barrier is only necessary when the allocation also requires
// a class initialization check.
//
// If the class is already observably initialized, then new-instance allocations are protected
// from publishing by the compiler which inserts its own StoreStore barrier.
dmb ish
// Use a "dmb ish" fence here because if there are later loads of statics (e.g. class size),
// they should happen-after the implicit initialization check.
//
// TODO: Remove this dmb for class initialization checks (b/36692143) by introducing
// a new observably-initialized class state.
.endif
ret
.Lslow_path\c_name:
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case of GC
mov x1, xSELF // pass Thread::Current
bl \cxx_name
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
// 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_TLAB_FAST_PATH_RESOLVED slowPathLabel isInitialized
ldr x4, [xSELF, #THREAD_LOCAL_POS_OFFSET]
ldr x5, [xSELF, #THREAD_LOCAL_END_OFFSET]
ldr w7, [x0, #MIRROR_CLASS_OBJECT_SIZE_ALLOC_FAST_PATH_OFFSET] // Load the object size (x7).
add x6, x4, x7 // Add object size to tlab pos.
cmp x6, x5 // Check if it fits, overflow works
// since the tlab pos and end are 32
// bit values.
// When isInitialized == 0, then the class is potentially not yet initialized.
// If the class is not yet initialized, the object size will be very large to force the branch
// below to be taken.
//
// See InitializeClassVisitors in class-inl.h for more details.
bhi \slowPathLabel
str x6, [xSELF, #THREAD_LOCAL_POS_OFFSET] // Store new thread_local_pos.
ldr x5, [xSELF, #THREAD_LOCAL_OBJECTS_OFFSET] // Increment thread_local_objects.
add x5, x5, #1
str x5, [xSELF, #THREAD_LOCAL_OBJECTS_OFFSET]
POISON_HEAP_REF w0
str w0, [x4, #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 x0, x4
.if \isInitialized == 0
// This barrier is only necessary when the allocation also requires
// a class initialization check.
//
// If the class is already observably initialized, then new-instance allocations are protected
// from publishing by the compiler which inserts its own StoreStore barrier.
dmb ish
// Use a "dmb ish" fence here because if there are later loads of statics (e.g. class size),
// they should happen-after the implicit initialization check.
//
// TODO: Remove this dmb for class initialization checks (b/36692143) by introducing
// a new observably-initialized class state.
.endif
ret
.endm
// The common code for art_quick_alloc_object_*region_tlab
.macro GENERATE_ALLOC_OBJECT_RESOLVED_TLAB name, entrypoint, isInitialized
ENTRY \name
// Fast path region tlab allocation.
// x0: type, xSELF(x19): Thread::Current
// x1-x7: free.
ALLOC_OBJECT_TLAB_FAST_PATH_RESOLVED .Lslow_path\name, \isInitialized
.Lslow_path\name:
SETUP_SAVE_REFS_ONLY_FRAME // Save callee saves in case of GC.
mov x1, xSELF // Pass Thread::Current.
bl \entrypoint // (mirror::Class*, 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
.macro ALLOC_ARRAY_TLAB_FAST_PATH_RESOLVED_WITH_SIZE slowPathLabel, xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
and \xTemp1, \xTemp1, #OBJECT_ALIGNMENT_MASK_TOGGLED64 // Apply alignment mask
// (addr + 7) & ~7. The mask must
// be 64 bits to keep high bits in
// case of overflow.
// Negative sized arrays are handled here since xCount holds a zero extended 32 bit value.
// Negative ints become large 64 bit unsigned ints which will always be larger than max signed
// 32 bit int. Since the max shift for arrays is 3, it can not become a negative 64 bit int.
cmp \xTemp1, #MIN_LARGE_OBJECT_THRESHOLD // Possibly a large object, go slow
bhs \slowPathLabel // path.
ldr \xTemp0, [xSELF, #THREAD_LOCAL_POS_OFFSET] // Check tlab for space, note that
// we use (end - begin) to handle
// negative size arrays. It is
// assumed that a negative size will
// always be greater unsigned than
// region size.
ldr \xTemp2, [xSELF, #THREAD_LOCAL_END_OFFSET]
sub \xTemp2, \xTemp2, \xTemp0
cmp \xTemp1, \xTemp2
// 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 x0 and x1.
// Move old thread_local_pos to x0
// for the return value.
mov x0, \xTemp0
add \xTemp0, \xTemp0, \xTemp1
str \xTemp0, [xSELF, #THREAD_LOCAL_POS_OFFSET] // Store new thread_local_pos.
ldr \xTemp0, [xSELF, #THREAD_LOCAL_OBJECTS_OFFSET] // Increment thread_local_objects.
add \xTemp0, \xTemp0, #1
str \xTemp0, [xSELF, #THREAD_LOCAL_OBJECTS_OFFSET]
POISON_HEAP_REF \wClass
str \wClass, [x0, #MIRROR_OBJECT_CLASS_OFFSET] // Store the class pointer.
str \wCount, [x0, #MIRROR_ARRAY_LENGTH_OFFSET] // Store the array length.
// Fence.
// 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.
ret
.endm
.macro GENERATE_ALLOC_ARRAY_TLAB name, entrypoint, size_setup
ENTRY \name
// Fast path array allocation for region tlab allocation.
// x0: mirror::Class* type
// x1: int32_t component_count
// x2-x7: free.
mov x3, x0
\size_setup x3, w3, x1, w1, x4, w4, x5, w5, x6, w6
ALLOC_ARRAY_TLAB_FAST_PATH_RESOLVED_WITH_SIZE .Lslow_path\name, x3, w3, x1, w1, x4, w4, x5, w5, x6, w6
.Lslow_path\name:
// x0: mirror::Class* klass
// x1: int32_t component_count
// x2: Thread* self
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves in case of GC
mov x2, xSELF // 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 xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
// Array classes are never finalizable or uninitialized, no need to check.
ldr \wTemp0, [\xClass, #MIRROR_CLASS_COMPONENT_TYPE_OFFSET] // Load component type
UNPOISON_HEAP_REF \wTemp0
ldr \wTemp0, [\xTemp0, #MIRROR_CLASS_OBJECT_PRIMITIVE_TYPE_OFFSET]
lsr \xTemp0, \xTemp0, #PRIMITIVE_TYPE_SIZE_SHIFT_SHIFT // Component size shift is in high 16
// bits.
// xCount is holding a 32 bit value,
// it can not overflow.
lsl \xTemp1, \xCount, \xTemp0 // Calculate data size
// Add array data offset and alignment.
add \xTemp1, \xTemp1, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
#if MIRROR_LONG_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 \xTemp0, \xTemp0, #1 // Add 4 to the length only if the
// component size shift is 3
// (for 64 bit alignment).
and \xTemp0, \xTemp0, #4
add \xTemp1, \xTemp1, \xTemp0
.endm
.macro COMPUTE_ARRAY_SIZE_8 xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
// Add array data offset and alignment.
add \xTemp1, \xCount, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_16 xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
lsl \xTemp1, \xCount, #1
// Add array data offset and alignment.
add \xTemp1, \xTemp1, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_32 xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
lsl \xTemp1, \xCount, #2
// Add array data offset and alignment.
add \xTemp1, \xTemp1, #(MIRROR_INT_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
.macro COMPUTE_ARRAY_SIZE_64 xClass, wClass, xCount, wCount, xTemp0, wTemp0, xTemp1, wTemp1, xTemp2, wTemp2
lsl \xTemp1, \xCount, #3
// Add array data offset and alignment.
add \xTemp1, \xTemp1, #(MIRROR_WIDE_ARRAY_DATA_OFFSET + OBJECT_ALIGNMENT_MASK)
.endm
// TODO(ngeoffray): art_quick_alloc_array_resolved_region_tlab is not used for arm64, remove
// the entrypoint once all backends have been updated to use the size variants.
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 thread has been asked to suspend.
*/
.extern artTestSuspendFromCode
ENTRY art_quick_test_suspend
SETUP_SAVE_EVERYTHING_FRAME RUNTIME_SAVE_EVERYTHING_FOR_SUSPEND_CHECK_METHOD_OFFSET // save callee saves for stack crawl
mov x0, xSELF
bl artTestSuspendFromCode // (Thread*)
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
ret
END art_quick_test_suspend
ENTRY art_quick_implicit_suspend
mov x0, xSELF
SETUP_SAVE_REFS_ONLY_FRAME // save callee saves for stack crawl
bl artTestSuspendFromCode // (Thread*)
RESTORE_SAVE_REFS_ONLY_FRAME
REFRESH_MARKING_REGISTER
ret
END art_quick_implicit_suspend
/*
* Called by managed code that is attempting to call a method on a proxy class. On entry
* x0 holds the proxy method and x1 holds the receiver; 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_X0
mov x2, xSELF // pass Thread::Current
mov x3, sp // pass SP
bl artQuickProxyInvokeHandler // (Method* proxy method, receiver, Thread*, SP)
ldr x2, [xSELF, THREAD_EXCEPTION_OFFSET]
cbnz x2, .Lexception_in_proxy // success if no exception is pending
RESTORE_SAVE_REFS_AND_ARGS_FRAME // Restore frame
REFRESH_MARKING_REGISTER
fmov d0, x0 // Store result in d0 in case it was float or double
ret // return on success
.Lexception_in_proxy:
RESTORE_SAVE_REFS_AND_ARGS_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_proxy_invoke_handler
/*
* Called to resolve an imt conflict.
* x0 is the conflict ArtMethod.
* xIP1 is a hidden argument that holds the target interface method's dex method index.
*
* Note that this stub writes to xIP0, xIP1, x13-x15, and x0.
*/
.extern artLookupResolvedMethod
ENTRY art_quick_imt_conflict_trampoline
ldr xIP0, [sp, #0] // Load referrer
// Load the declaring class (without read barrier) and access flags (for obsolete method check).
// The obsolete flag is set with suspended threads, so we do not need an acquire operation here.
#if ART_METHOD_ACCESS_FLAGS_OFFSET != ART_METHOD_DECLARING_CLASS_OFFSET + 4
#error "Expecting declaring class and access flags to be consecutive for LDP."
#endif
ldp wIP0, w15, [xIP0, #ART_METHOD_DECLARING_CLASS_OFFSET]
// If the method is obsolete, just go through the dex cache miss slow path.
tbnz x15, #ACC_OBSOLETE_METHOD_SHIFT, .Limt_conflict_trampoline_dex_cache_miss
ldr wIP0, [xIP0, #MIRROR_CLASS_DEX_CACHE_OFFSET] // Load the DexCache (without read barrier).
UNPOISON_HEAP_REF wIP0
ubfx x15, xIP1, #0, #METHOD_DEX_CACHE_HASH_BITS // Calculate DexCache method slot index.
ldr xIP0, [xIP0, #MIRROR_DEX_CACHE_RESOLVED_METHODS_OFFSET] // Load the resolved methods.
add xIP0, xIP0, x15, lsl #(POINTER_SIZE_SHIFT + 1) // Load DexCache method slot address.
// Relaxed atomic load x14:x15 from the dex cache slot.
.Limt_conflict_trampoline_retry_load:
ldxp x14, x15, [xIP0]
stxp w13, x14, x15, [xIP0]
cbnz w13, .Limt_conflict_trampoline_retry_load
cmp x15, xIP1 // Compare method index to see if we had a DexCache method hit.
bne .Limt_conflict_trampoline_dex_cache_miss
.Limt_conflict_trampoline_have_interface_method:
ldr xIP1, [x0, #ART_METHOD_JNI_OFFSET_64] // Load ImtConflictTable
ldr x0, [xIP1] // Load first entry in ImtConflictTable.
.Limt_table_iterate:
cmp x0, x14
// 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 x0, .Lconflict_trampoline
// Iterate over the entries of the ImtConflictTable.
ldr x0, [xIP1, #(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 x0, [xIP1, #__SIZEOF_POINTER__]
ldr xIP0, [x0, #ART_METHOD_QUICK_CODE_OFFSET_64]
br xIP0
.Lconflict_trampoline:
// Call the runtime stub to populate the ImtConflictTable and jump to the
// resolved method.
mov x0, x14 // Load interface method
INVOKE_TRAMPOLINE_BODY artInvokeInterfaceTrampoline
.Limt_conflict_trampoline_dex_cache_miss:
// We're not creating a proper runtime method frame here,
// artLookupResolvedMethod() is not allowed to walk the stack.
// Save GPR args and return address, allocate space for FPR args, align stack.
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, (8 * 8 + 8 * 8 + 8 + 8)
SAVE_TWO_REGS x2, x3, 16
SAVE_TWO_REGS x4, x5, 32
SAVE_TWO_REGS x6, x7, 48
SAVE_REG xLR, (8 * 8 + 8 * 8 + 8)
// Save FPR args.
stp d0, d1, [sp, #64]
stp d2, d3, [sp, #80]
stp d4, d5, [sp, #96]
stp d6, d7, [sp, #112]
mov x0, xIP1 // Pass method index.
ldr x1, [sp, #(8 * 8 + 8 * 8 + 8 + 8)] // Pass referrer.
bl artLookupResolvedMethod // (uint32_t method_index, ArtMethod* referrer)
mov x14, x0 // Move the interface method to x14 where the loop above expects it.
// Restore FPR args.
ldp d0, d1, [sp, #64]
ldp d2, d3, [sp, #80]
ldp d4, d5, [sp, #96]
ldp d6, d7, [sp, #112]
// Restore GPR args and return address.
RESTORE_REG xLR, (8 * 8 + 8 * 8 + 8)
RESTORE_TWO_REGS x2, x3, 16
RESTORE_TWO_REGS x4, x5, 32
RESTORE_TWO_REGS x6, x7, 48
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, (8 * 8 + 8 * 8 + 8 + 8)
// If the method wasn't resolved, skip the lookup and go to artInvokeInterfaceTrampoline().
cbz x14, .Lconflict_trampoline
b .Limt_conflict_trampoline_have_interface_method
END art_quick_imt_conflict_trampoline
ENTRY art_quick_resolution_trampoline
SETUP_SAVE_REFS_AND_ARGS_FRAME
mov x2, xSELF
mov x3, sp
bl artQuickResolutionTrampoline // (called, receiver, Thread*, SP)
cbz x0, 1f
mov xIP0, x0 // Remember returned code pointer in xIP0.
ldr x0, [sp, #0] // artQuickResolutionTrampoline puts called method in *SP.
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
br xIP0
1:
RESTORE_SAVE_REFS_AND_ARGS_FRAME
DELIVER_PENDING_EXCEPTION
END art_quick_resolution_trampoline
/*
* Generic JNI frame layout:
*
* #-------------------#
* | |
* | caller method... |
* #-------------------# <--- SP on entry
* | Return X30/LR |
* | X29/FP | callee save
* | X28 | callee save
* | X27 | callee save
* | X26 | callee save
* | X25 | callee save
* | X24 | callee save
* | X23 | callee save
* | X22 | callee save
* | X21 | callee save
* | X20 | callee save
* | X19 | callee save
* | X7 | arg7
* | X6 | arg6
* | X5 | arg5
* | X4 | arg4
* | X3 | arg3
* | X2 | arg2
* | X1 | arg1
* | D7 | float arg 8
* | D6 | float arg 7
* | D5 | float arg 6
* | D4 | float arg 5
* | D3 | float arg 4
* | D2 | float arg 3
* | D1 | float arg 2
* | D0 | float arg 1
* | Method* | <- X0
* #-------------------#
* | local ref cookie | // 4B
* | handle scope size | // 4B
* #-------------------#
* | JNI Call Stack |
* #-------------------# <--- SP on native call
* | |
* | Stack for Regs | The trampoline assembly will pop these values
* | | into registers for native call
* #-------------------#
* | Native code ptr |
* #-------------------#
* | Free scratch |
* #-------------------#
* | Ptr to (1) | <--- SP
* #-------------------#
*/
/*
* Called to do a generic JNI down-call
*/
ENTRY art_quick_generic_jni_trampoline
SETUP_SAVE_REFS_AND_ARGS_FRAME_WITH_METHOD_IN_X0
// Save SP , so we can have static CFI info.
mov x28, sp
.cfi_def_cfa_register x28
// This looks the same, but is different: this will be updated to point to the bottom
// of the frame when the handle scope is inserted.
mov xFP, sp
mov xIP0, #5120
sub sp, sp, xIP0
// prepare for artQuickGenericJniTrampoline call
// (Thread*, SP)
// x0 x1 <= C calling convention
// xSELF xFP <= where they are
mov x0, xSELF // Thread*
mov x1, xFP
bl artQuickGenericJniTrampoline // (Thread*, sp)
// The C call will have registered the complete save-frame on success.
// The result of the call is:
// x0: pointer to native code, 0 on error.
// x1: pointer to the bottom of the used area of the alloca, can restore stack till there.
// Check for error = 0.
cbz x0, .Lexception_in_native
// Release part of the alloca.
mov sp, x1
// Save the code pointer
mov xIP0, x0
// Load parameters from frame into registers.
// TODO Check with artQuickGenericJniTrampoline.
// Also, check again APPCS64 - the stack arguments are interleaved.
ldp x0, x1, [sp]
ldp x2, x3, [sp, #16]
ldp x4, x5, [sp, #32]
ldp x6, x7, [sp, #48]
ldp d0, d1, [sp, #64]
ldp d2, d3, [sp, #80]
ldp d4, d5, [sp, #96]
ldp d6, d7, [sp, #112]
add sp, sp, #128
blr xIP0 // native call.
// result sign extension is handled in C code
// prepare for artQuickGenericJniEndTrampoline call
// (Thread*, result, result_f)
// x0 x1 x2 <= C calling convention
mov x1, x0 // Result (from saved).
mov x0, xSELF // Thread register.
fmov x2, d0 // d0 will contain floating point result, but needs to go into x2
bl artQuickGenericJniEndTrampoline
// Pending exceptions possible.
ldr x2, [xSELF, THREAD_EXCEPTION_OFFSET]
cbnz x2, .Lexception_in_native
// Tear down the alloca.
mov sp, x28
.cfi_def_cfa_register sp
// Tear down the callee-save frame.
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
// store into fpr, for when it's a fpr return...
fmov d0, x0
ret
.Lexception_in_native:
// Move to x1 then sp to please assembler.
ldr x1, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
mov sp, x1
.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
/*
* Called to bridge from the quick to interpreter ABI. On entry the arguments match those
* of a quick call:
* x0 = method being called/to bridge to.
* x1..x7, d0..d7 = arguments to that method.
*/
ENTRY art_quick_to_interpreter_bridge
SETUP_SAVE_REFS_AND_ARGS_FRAME // Set up frame and save arguments.
// x0 will contain mirror::ArtMethod* method.
mov x1, xSELF // How to get Thread::Current() ???
mov x2, sp
// uint64_t artQuickToInterpreterBridge(mirror::ArtMethod* method, Thread* self,
// mirror::ArtMethod** sp)
bl artQuickToInterpreterBridge
RESTORE_SAVE_REFS_AND_ARGS_FRAME // TODO: no need to restore arguments in this case.
REFRESH_MARKING_REGISTER
fmov d0, x0
RETURN_OR_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
//
// Instrumentation-related stubs
//
.extern artInstrumentationMethodEntryFromCode
ENTRY art_quick_instrumentation_entry
SETUP_SAVE_REFS_AND_ARGS_FRAME
mov x20, x0 // Preserve method reference in a callee-save.
mov x2, xSELF
mov x3, sp // Pass SP
bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, SP)
mov xIP0, x0 // x0 = result of call.
mov x0, x20 // Reload method reference.
RESTORE_SAVE_REFS_AND_ARGS_FRAME // Note: will restore xSELF
REFRESH_MARKING_REGISTER
cbz xIP0, 1f // Deliver the pending exception if method is null.
adr xLR, art_quick_instrumentation_exit
br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit.
1:
DELIVER_PENDING_EXCEPTION
END art_quick_instrumentation_entry
.extern artInstrumentationMethodExitFromCode
ENTRY art_quick_instrumentation_exit
mov xLR, #0 // Clobber LR for later checks.
SETUP_SAVE_EVERYTHING_FRAME
add x3, sp, #8 // Pass floating-point result pointer, in kSaveEverything frame.
add x2, sp, #264 // Pass integer result pointer, in kSaveEverything frame.
mov x1, sp // Pass SP.
mov x0, xSELF // Pass Thread.
bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res*, fpr_res*)
cbz x0, .Ldo_deliver_instrumentation_exception
// Handle error
cbnz x1, .Ldeoptimize
// Normal return.
str x0, [sp, #FRAME_SIZE_SAVE_EVERYTHING - 8]
// Set return pc.
RESTORE_SAVE_EVERYTHING_FRAME
REFRESH_MARKING_REGISTER
br lr
.Ldo_deliver_instrumentation_exception:
DELIVER_PENDING_EXCEPTION_FRAME_READY
.Ldeoptimize:
str x1, [sp, #FRAME_SIZE_SAVE_EVERYTHING - 8]
// 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
mov x0, xSELF // Pass thread.
bl artDeoptimize // (Thread*)
brk 0
END art_quick_deoptimize
/*
* Compiled code has requested that we deoptimize into the interpreter. The deoptimization
* will long jump to the upcall with a special exception of -1.
*/
.extern artDeoptimizeFromCompiledCode
ENTRY art_quick_deoptimize_from_compiled_code
SETUP_SAVE_EVERYTHING_FRAME
mov x1, xSELF // Pass thread.
bl artDeoptimizeFromCompiledCode // (DeoptimizationKind, Thread*)
brk 0
END art_quick_deoptimize_from_compiled_code
/*
* String's indexOf.
*
* TODO: Not very optimized.
* On entry:
* x0: string object (known non-null)
* w1: char to match (known <= 0xFFFF)
* w2: Starting offset in string data
*/
ENTRY art_quick_indexof
#if (STRING_COMPRESSION_FEATURE)
ldr w4, [x0, #MIRROR_STRING_COUNT_OFFSET]
#else
ldr w3, [x0, #MIRROR_STRING_COUNT_OFFSET]
#endif
add x0, x0, #MIRROR_STRING_VALUE_OFFSET
#if (STRING_COMPRESSION_FEATURE)
/* w4 holds count (with flag) and w3 holds actual length */
lsr w3, w4, #1
#endif
/* Clamp start to [0..count] */
cmp w2, #0
csel w2, wzr, w2, lt
cmp w2, w3
csel w2, w3, w2, gt
/* Save a copy to compute result */
mov x5, x0
#if (STRING_COMPRESSION_FEATURE)
tbz w4, #0, .Lstring_indexof_compressed
#endif
/* Build pointer to start of data to compare and pre-bias */
add x0, x0, x2, lsl #1
sub x0, x0, #2
/* Compute iteration count */
sub w2, w3, w2
/*
* At this point we have:
* x0: start of the data to test
* w1: char to compare
* w2: iteration count
* x5: original start of string data
*/
subs w2, w2, #4
b.lt .Lindexof_remainder
.Lindexof_loop4:
ldrh w6, [x0, #2]!
ldrh w7, [x0, #2]!
ldrh wIP0, [x0, #2]!
ldrh wIP1, [x0, #2]!
cmp w6, w1
b.eq .Lmatch_0
cmp w7, w1
b.eq .Lmatch_1
cmp wIP0, w1
b.eq .Lmatch_2
cmp wIP1, w1
b.eq .Lmatch_3
subs w2, w2, #4
b.ge .Lindexof_loop4
.Lindexof_remainder:
adds w2, w2, #4
b.eq .Lindexof_nomatch
.Lindexof_loop1:
ldrh w6, [x0, #2]!
cmp w6, w1
b.eq .Lmatch_3
subs w2, w2, #1
b.ne .Lindexof_loop1
.Lindexof_nomatch:
mov x0, #-1
ret
.Lmatch_0:
sub x0, x0, #6
sub x0, x0, x5
asr x0, x0, #1
ret
.Lmatch_1:
sub x0, x0, #4
sub x0, x0, x5
asr x0, x0, #1
ret
.Lmatch_2:
sub x0, x0, #2
sub x0, x0, x5
asr x0, x0, #1
ret
.Lmatch_3:
sub x0, x0, x5
asr x0, x0, #1
ret
#if (STRING_COMPRESSION_FEATURE)
/*
* Comparing compressed string character-per-character with
* input character
*/
.Lstring_indexof_compressed:
add x0, x0, x2
sub x0, x0, #1
sub w2, w3, w2
.Lstring_indexof_compressed_loop:
subs w2, w2, #1
b.lt .Lindexof_nomatch
ldrb w6, [x0, #1]!
cmp w6, w1
b.eq .Lstring_indexof_compressed_matched
b .Lstring_indexof_compressed_loop
.Lstring_indexof_compressed_matched:
sub x0, x0, x5
ret
#endif
END art_quick_indexof
/*
* Create a function `name` calling the ReadBarrier::Mark routine,
* getting its argument and returning its result through W register
* `wreg` (corresponding to X register `xreg`), saving and restoring
* all caller-save registers.
*
* If `wreg` is different from `w0`, the generated function follows a
* non-standard runtime calling convention:
* - register `wreg` is used to pass the (sole) argument of this
* function (instead of W0);
* - register `wreg` is used to return the result of this function
* (instead of W0);
* - W0 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, wreg, xreg
ENTRY \name
// Reference is null, no work to do at all.
cbz \wreg, .Lret_rb_\name
// Use wIP0 as temp and check the mark bit of the reference. wIP0 is not used by the compiler.
ldr wIP0, [\xreg, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
tbz wIP0, #LOCK_WORD_MARK_BIT_SHIFT, .Lnot_marked_rb_\name
.Lret_rb_\name:
ret
.Lnot_marked_rb_\name:
// Check if the top two bits are one, if this is the case it is a forwarding address.
tst wIP0, wIP0, lsl #1
bmi .Lret_forwarding_address\name
.Lslow_rb_\name:
/*
* Allocate 44 stack slots * 8 = 352 bytes:
* - 20 slots for core registers X0-15, X17-X19, LR
* - 24 slots for floating-point registers D0-D7 and D16-D31
*/
// We must not clobber IP1 since code emitted for HLoadClass and HLoadString
// relies on IP1 being preserved.
// Save all potentially live caller-save core registers.
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, 352
SAVE_TWO_REGS x2, x3, 16
SAVE_TWO_REGS x4, x5, 32
SAVE_TWO_REGS x6, x7, 48
SAVE_TWO_REGS x8, x9, 64
SAVE_TWO_REGS x10, x11, 80
SAVE_TWO_REGS x12, x13, 96
SAVE_TWO_REGS x14, x15, 112
SAVE_TWO_REGS x17, x18, 128 // Skip x16, i.e. IP0.
SAVE_TWO_REGS x19, xLR, 144 // Save also return address.
// Save all potentially live caller-save floating-point registers.
stp d0, d1, [sp, #160]
stp d2, d3, [sp, #176]
stp d4, d5, [sp, #192]
stp d6, d7, [sp, #208]
stp d16, d17, [sp, #224]
stp d18, d19, [sp, #240]
stp d20, d21, [sp, #256]
stp d22, d23, [sp, #272]
stp d24, d25, [sp, #288]
stp d26, d27, [sp, #304]
stp d28, d29, [sp, #320]
stp d30, d31, [sp, #336]
.ifnc \wreg, w0
mov w0, \wreg // Pass arg1 - obj from `wreg`
.endif
bl artReadBarrierMark // artReadBarrierMark(obj)
.ifnc \wreg, w0
mov \wreg, w0 // Return result into `wreg`
.endif
// Restore core regs, except `xreg`, as `wreg` is used to return the
// result of this function (simply remove it from the stack instead).
POP_REGS_NE x0, x1, 0, \xreg
POP_REGS_NE x2, x3, 16, \xreg
POP_REGS_NE x4, x5, 32, \xreg
POP_REGS_NE x6, x7, 48, \xreg
POP_REGS_NE x8, x9, 64, \xreg
POP_REGS_NE x10, x11, 80, \xreg
POP_REGS_NE x12, x13, 96, \xreg
POP_REGS_NE x14, x15, 112, \xreg
POP_REGS_NE x17, x18, 128, \xreg
POP_REGS_NE x19, xLR, 144, \xreg // Restore also return address.
// Restore floating-point registers.
ldp d0, d1, [sp, #160]
ldp d2, d3, [sp, #176]
ldp d4, d5, [sp, #192]
ldp d6, d7, [sp, #208]
ldp d16, d17, [sp, #224]
ldp d18, d19, [sp, #240]
ldp d20, d21, [sp, #256]
ldp d22, d23, [sp, #272]
ldp d24, d25, [sp, #288]
ldp d26, d27, [sp, #304]
ldp d28, d29, [sp, #320]
ldp d30, d31, [sp, #336]
// Remove frame and return.
DECREASE_FRAME 352
ret
.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 \wreg, wIP0, #LOCK_WORD_STATE_FORWARDING_ADDRESS_SHIFT
ret
END \name
.endm
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg00, w0, x0
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg01, w1, x1
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg02, w2, x2
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg03, w3, x3
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg04, w4, x4
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg05, w5, x5
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg06, w6, x6
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg07, w7, x7
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg08, w8, x8
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg09, w9, x9
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg10, w10, x10
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg11, w11, x11
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg12, w12, x12
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg13, w13, x13
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg14, w14, x14
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg15, w15, x15
// READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg16, w16, x16 ip0 is blocked
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg17, w17, x17
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg18, w18, x18
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg19, w19, x19
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg20, w20, x20
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg21, w21, x21
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg22, w22, x22
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg23, w23, x23
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg24, w24, x24
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg25, w25, x25
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg26, w26, x26
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg27, w27, x27
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg28, w28, x28
READ_BARRIER_MARK_REG art_quick_read_barrier_mark_reg29, w29, x29
.macro SELECT_X_OR_W_FOR_MACRO macro_to_use, x, w, xreg
.if \xreg
\macro_to_use \x
.else
\macro_to_use \w
.endif
.endm
.macro FOR_REGISTERS macro_for_register, macro_for_reserved_register, xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x0, w0, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x1, w1, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x2, w2, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x3, w3, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x4, w4, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x5, w5, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x6, w6, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x7, w7, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x8, w8, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x9, w9, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x10, w10, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x11, w11, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x12, w12, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x13, w13, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x14, w14, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x15, w15, \xreg
\macro_for_reserved_register // IP0 is reserved
\macro_for_reserved_register // IP1 is reserved
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x18, w18, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x19, w19, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x20, w20, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x21, w21, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x22, w22, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x23, w23, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x24, w24, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x25, w25, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x26, w26, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x27, w27, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x28, w28, \xreg
SELECT_X_OR_W_FOR_MACRO \macro_for_register, x29, w29, \xreg
\macro_for_reserved_register // lr is reserved
\macro_for_reserved_register // sp is reserved
.endm
.macro FOR_XREGISTERS macro_for_register, macro_for_reserved_register
FOR_REGISTERS \macro_for_register, \macro_for_reserved_register, /* xreg */ 1
.endm
.macro FOR_WREGISTERS macro_for_register, macro_for_reserved_register
FOR_REGISTERS \macro_for_register, \macro_for_reserved_register, /* xreg */ 0
.endm
.macro BRK0_BRK0
brk 0
brk 0
.endm
#if BAKER_MARK_INTROSPECTION_FIELD_LDR_OFFSET != BAKER_MARK_INTROSPECTION_ARRAY_LDR_OFFSET
#error "Array and field introspection code sharing requires same LDR offset."
#endif
.macro INTROSPECTION_ARRAY_LOAD index_reg
ldr wIP0, [xIP0, \index_reg, lsl #2]
b art_quick_read_barrier_mark_introspection
.endm
.macro MOV_WIP0_TO_WREG_AND_BL_LR reg
mov \reg, wIP0
br lr // Do not use RET as we do not enter the entrypoint with "BL".
.endm
.macro READ_BARRIER_MARK_INTROSPECTION_SLOW_PATH ldr_offset
/*
* Allocate 44 stack slots * 8 = 352 bytes:
* - 19 slots for core registers X0-15, X18-X19, LR
* - 1 slot padding
* - 24 slots for floating-point registers D0-D7 and D16-D31
*/
// Save all potentially live caller-save core registers.
SAVE_TWO_REGS_INCREASE_FRAME x0, x1, 352
SAVE_TWO_REGS x2, x3, 16
SAVE_TWO_REGS x4, x5, 32
SAVE_TWO_REGS x6, x7, 48
SAVE_TWO_REGS x8, x9, 64
SAVE_TWO_REGS x10, x11, 80
SAVE_TWO_REGS x12, x13, 96
SAVE_TWO_REGS x14, x15, 112
SAVE_TWO_REGS x18, x19, 128 // Skip x16, x17, i.e. IP0, IP1.
SAVE_REG xLR, 144 // Save return address, skip padding at 152.
// Save all potentially live caller-save floating-point registers.
stp d0, d1, [sp, #160]
stp d2, d3, [sp, #176]
stp d4, d5, [sp, #192]
stp d6, d7, [sp, #208]
stp d16, d17, [sp, #224]
stp d18, d19, [sp, #240]
stp d20, d21, [sp, #256]
stp d22, d23, [sp, #272]
stp d24, d25, [sp, #288]
stp d26, d27, [sp, #304]
stp d28, d29, [sp, #320]
stp d30, d31, [sp, #336]
mov x0, xIP0
bl artReadBarrierMark // artReadBarrierMark(obj)
mov xIP0, x0
// Restore core regs, except x0 and x1 as the return register switch case
// address calculation is smoother with an extra register.
RESTORE_TWO_REGS x2, x3, 16
RESTORE_TWO_REGS x4, x5, 32
RESTORE_TWO_REGS x6, x7, 48
RESTORE_TWO_REGS x8, x9, 64
RESTORE_TWO_REGS x10, x11, 80
RESTORE_TWO_REGS x12, x13, 96
RESTORE_TWO_REGS x14, x15, 112
RESTORE_TWO_REGS x18, x19, 128 // Skip x16, x17, i.e. IP0, IP1.
RESTORE_REG xLR, 144 // Restore return address.
// Restore caller-save floating-point registers.
ldp d0, d1, [sp, #160]
ldp d2, d3, [sp, #176]
ldp d4, d5, [sp, #192]
ldp d6, d7, [sp, #208]
ldp d16, d17, [sp, #224]
ldp d18, d19, [sp, #240]
ldp d20, d21, [sp, #256]
ldp d22, d23, [sp, #272]
ldp d24, d25, [sp, #288]
ldp d26, d27, [sp, #304]
ldp d28, d29, [sp, #320]
ldp d30, d31, [sp, #336]
ldr x0, [lr, #\ldr_offset] // Load the instruction.
adr xIP1, .Lmark_introspection_return_switch
bfi xIP1, x0, #3, #5 // Calculate switch case address.
RESTORE_TWO_REGS_DECREASE_FRAME x0, x1, 352
br xIP1
.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 at [LR, #-4], 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]) 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 IP0 using introspection and calls the main entrypoint,
* art_quick_read_barrier_mark_introspection. With heap poisoning enabled,
* the passed reference is poisoned.
*
* For array accesses with non-constant index, the thunk inserts the bits
* 16-21 of the LDR instruction to the entrypoint address, effectively
* calculating a switch case label based on the index register (bits 16-20)
* and adding an extra offset (bit 21 is set) to differentiate from the
* main entrypoint, then moves the base register to IP0 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 32 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 (768 bytes,
* or BAKER_MARK_INTROSPECTION_GC_ROOT_ENTRYPOINT_OFFSET) from the main
* entrypoint and the GC root thunk adjusts the entrypoint pointer, moves
* the root register to IP0 and jumps to the customized entrypoint,
* art_quick_read_barrier_mark_introspection_gc_roots. The thunk also
* performs all the fast-path checks, so we need just the slow path.
*
* The code structure is
* art_quick_read_barrier_mark_introspection:
* Up to 256 bytes for the main entrypoint code.
* Padding to 256 bytes if needed.
* art_quick_read_barrier_mark_introspection_arrays:
* Exactly 256 bytes for array load switch cases (32x2 instructions).
* .Lmark_introspection_return_switch:
* Exactly 256 bytes for return switch cases (32x2 instructions).
* art_quick_read_barrier_mark_introspection_gc_roots:
* GC root entrypoint code.
*/
.balign 512
ENTRY art_quick_read_barrier_mark_introspection
// At this point, IP0 contains the reference, IP1 can be freely used.
// For heap poisoning, the reference is poisoned, so unpoison it first.
UNPOISON_HEAP_REF wIP0
// If reference is null, just return it in the right register.
cbz wIP0, .Lmark_introspection_return
// Use wIP1 as temp and check the mark bit of the reference.
ldr wIP1, [xIP0, #MIRROR_OBJECT_LOCK_WORD_OFFSET]
tbz wIP1, #LOCK_WORD_MARK_BIT_SHIFT, .Lmark_introspection_unmarked
.Lmark_introspection_return:
// Without an extra register for the return switch case address calculation,
// we exploit the high word of the xIP0 to temporarily store the ref_reg*8,
// so the return switch below must move wIP0 instead of xIP0 to the register.
ldr wIP1, [lr, #BAKER_MARK_INTROSPECTION_FIELD_LDR_OFFSET] // Load the instruction.
bfi xIP0, xIP1, #(32 + 3), #5 // Extract ref_reg*8 to high word in xIP0.
adr xIP1, .Lmark_introspection_return_switch
bfxil xIP1, xIP0, #32, #8 // Calculate return switch case address.
br xIP1
.Lmark_introspection_unmarked:
// Check if the top two bits are one, if this is the case it is a forwarding address.
tst wIP1, wIP1, lsl #1
bmi .Lmark_introspection_forwarding_address
READ_BARRIER_MARK_INTROSPECTION_SLOW_PATH BAKER_MARK_INTROSPECTION_FIELD_LDR_OFFSET
.Lmark_introspection_forwarding_address:
// 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 wIP0, wIP1, #LOCK_WORD_STATE_FORWARDING_ADDRESS_SHIFT
b .Lmark_introspection_return
// We're very close to the alloted 256B for the entrypoint code before the
// array switch cases. Should we go a little bit over the limit, we can
// move some code after the array switch cases and return switch cases.
.balign 256
.hidden art_quick_read_barrier_mark_introspection_arrays
.global art_quick_read_barrier_mark_introspection_arrays
art_quick_read_barrier_mark_introspection_arrays:
FOR_XREGISTERS INTROSPECTION_ARRAY_LOAD, BRK0_BRK0
.Lmark_introspection_return_switch:
FOR_WREGISTERS MOV_WIP0_TO_WREG_AND_BL_LR, BRK0_BRK0
.hidden art_quick_read_barrier_mark_introspection_gc_roots
.global art_quick_read_barrier_mark_introspection_gc_roots
art_quick_read_barrier_mark_introspection_gc_roots:
READ_BARRIER_MARK_INTROSPECTION_SLOW_PATH BAKER_MARK_INTROSPECTION_GC_ROOT_LDR_OFFSET
END art_quick_read_barrier_mark_introspection
.extern artInvokePolymorphic
ENTRY art_quick_invoke_polymorphic
SETUP_SAVE_REFS_AND_ARGS_FRAME // Save callee saves in case allocation triggers GC.
mov x2, xSELF
mov x3, sp
INCREASE_FRAME 16 // Reserve space for JValue result.
str xzr, [sp, #0] // Initialize result to zero.
mov x0, sp // Set r0 to point to result.
bl artInvokePolymorphic // artInvokePolymorphic(result, receiver, thread, save_area)
uxtb w0, w0 // Result is the return type descriptor as a char.
sub w0, w0, 'A' // Convert to zero based index.
cmp w0, 'Z' - 'A'
bhi .Lcleanup_and_return // Clean-up if out-of-bounds.
adrp x1, .Lhandler_table // Compute address of handler table.
add x1, x1, :lo12:.Lhandler_table
ldrb w0, [x1, w0, uxtw] // Lookup handler offset in handler table.
adr x1, .Lstart_of_handlers
add x0, x1, w0, sxtb #2 // Convert relative offset to absolute address.
br x0 // Branch to handler.
.Lstart_of_handlers:
.Lstore_boolean_result:
ldrb w0, [sp]
b .Lcleanup_and_return
.Lstore_char_result:
ldrh w0, [sp]
b .Lcleanup_and_return
.Lstore_float_result:
ldr s0, [sp]
str s0, [sp, #32]
b .Lcleanup_and_return
.Lstore_double_result:
ldr d0, [sp]
str d0, [sp, #32]
b .Lcleanup_and_return
.Lstore_long_result:
ldr x0, [sp]
// Fall-through
.Lcleanup_and_return:
DECREASE_FRAME 16
RESTORE_SAVE_REFS_AND_ARGS_FRAME
REFRESH_MARKING_REGISTER
RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
.section .rodata // Place handler table in read-only section away from text.
.align 2
.macro HANDLER_TABLE_OFFSET handler_label
.byte (\handler_label - .Lstart_of_handlers) / 4
.endm
.Lhandler_table:
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // A
HANDLER_TABLE_OFFSET(.Lstore_long_result) // B (byte)
HANDLER_TABLE_OFFSET(.Lstore_char_result) // C (char)
HANDLER_TABLE_OFFSET(.Lstore_double_result) // D (double)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // E
HANDLER_TABLE_OFFSET(.Lstore_float_result) // F (float)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // G
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // H
HANDLER_TABLE_OFFSET(.Lstore_long_result) // I (int)
HANDLER_TABLE_OFFSET(.Lstore_long_result) // J (long)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // K
HANDLER_TABLE_OFFSET(.Lstore_long_result) // L (object - references are compressed and only 32-bits)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // M
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // N
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // O
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // P
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // Q
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // R
HANDLER_TABLE_OFFSET(.Lstore_long_result) // S (short)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // T
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // U
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // V (void)
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // W
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // X
HANDLER_TABLE_OFFSET(.Lcleanup_and_return) // Y
HANDLER_TABLE_OFFSET(.Lstore_boolean_result) // Z (boolean)
.text
END art_quick_invoke_polymorphic