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android / platform / art / cd77378 / . / runtime / arch / arm64 / quick_entrypoints_arm64.S
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/*
* 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 that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kSaveAll)
*/
.macro SETUP_SAVE_ALL_CALLEE_SAVE_FRAME
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) .
// xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] .
// Loads appropriate callee-save-method.
ldr xIP0, [xIP0, RUNTIME_SAVE_ALL_CALLEE_SAVE_FRAME_OFFSET ]
sub sp, sp, #176
.cfi_adjust_cfa_offset 176
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_SAVE_ALL_CALLEE_SAVE != 176)
#error "SAVE_ALL_CALLEE_SAVE_FRAME(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
stp x19, x20, [sp, #80]
.cfi_rel_offset x19, 80
.cfi_rel_offset x20, 88
stp x21, x22, [sp, #96]
.cfi_rel_offset x21, 96
.cfi_rel_offset x22, 104
stp x23, x24, [sp, #112]
.cfi_rel_offset x23, 112
.cfi_rel_offset x24, 120
stp x25, x26, [sp, #128]
.cfi_rel_offset x25, 128
.cfi_rel_offset x26, 136
stp x27, x28, [sp, #144]
.cfi_rel_offset x27, 144
.cfi_rel_offset x28, 152
stp x29, xLR, [sp, #160]
.cfi_rel_offset x29, 160
.cfi_rel_offset x30, 168
// Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs].
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(kRefsOnly).
*/
.macro SETUP_REFS_ONLY_CALLEE_SAVE_FRAME
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) .
// xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefOnly] .
// Loads appropriate callee-save-method.
ldr xIP0, [xIP0, RUNTIME_REFS_ONLY_CALLEE_SAVE_FRAME_OFFSET ]
sub sp, sp, #96
.cfi_adjust_cfa_offset 96
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_REFS_ONLY_CALLEE_SAVE != 96)
#error "REFS_ONLY_CALLEE_SAVE_FRAME(ARM64) size not as expected."
#endif
// GP callee-saves.
// x20 paired with ArtMethod* - see below.
stp x21, x22, [sp, #16]
.cfi_rel_offset x21, 16
.cfi_rel_offset x22, 24
stp x23, x24, [sp, #32]
.cfi_rel_offset x23, 32
.cfi_rel_offset x24, 40
stp x25, x26, [sp, #48]
.cfi_rel_offset x25, 48
.cfi_rel_offset x26, 56
stp x27, x28, [sp, #64]
.cfi_rel_offset x27, 64
.cfi_rel_offset x28, 72
stp x29, xLR, [sp, #80]
.cfi_rel_offset x29, 80
.cfi_rel_offset x30, 88
// Store ArtMethod* Runtime::callee_save_methods_[kRefsOnly].
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_REFS_ONLY_CALLEE_SAVE_FRAME
// Callee-saves.
ldr x20, [sp, #8]
.cfi_restore x20
ldp x21, x22, [sp, #16]
.cfi_restore x21
.cfi_restore x22
ldp x23, x24, [sp, #32]
.cfi_restore x23
.cfi_restore x24
ldp x25, x26, [sp, #48]
.cfi_restore x25
.cfi_restore x26
ldp x27, x28, [sp, #64]
.cfi_restore x27
.cfi_restore x28
ldp x29, xLR, [sp, #80]
.cfi_restore x29
.cfi_restore x30
add sp, sp, #96
.cfi_adjust_cfa_offset -96
.endm
.macro POP_REFS_ONLY_CALLEE_SAVE_FRAME
add sp, sp, #96
.cfi_adjust_cfa_offset - 96
.endm
.macro RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
ret
.endm
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL
sub sp, sp, #224
.cfi_adjust_cfa_offset 224
// Ugly compile-time check, but we only have the preprocessor.
#if (FRAME_SIZE_REFS_AND_ARGS_CALLEE_SAVE != 224)
#error "REFS_AND_ARGS_CALLEE_SAVE_FRAME(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.
stp x1, x2, [sp, #80]
.cfi_rel_offset x1, 80
.cfi_rel_offset x2, 88
stp x3, x4, [sp, #96]
.cfi_rel_offset x3, 96
.cfi_rel_offset x4, 104
stp x5, x6, [sp, #112]
.cfi_rel_offset x5, 112
.cfi_rel_offset x6, 120
// x7, Callee-saves.
stp x7, x20, [sp, #128]
.cfi_rel_offset x7, 128
.cfi_rel_offset x20, 136
stp x21, x22, [sp, #144]
.cfi_rel_offset x21, 144
.cfi_rel_offset x22, 152
stp x23, x24, [sp, #160]
.cfi_rel_offset x23, 160
.cfi_rel_offset x24, 168
stp x25, x26, [sp, #176]
.cfi_rel_offset x25, 176
.cfi_rel_offset x26, 184
stp x27, x28, [sp, #192]
.cfi_rel_offset x27, 192
.cfi_rel_offset x28, 200
// x29(callee-save) and LR.
stp x29, xLR, [sp, #208]
.cfi_rel_offset x29, 208
.cfi_rel_offset x30, 216
.endm
/*
* Macro that sets up the callee save frame to conform with
* Runtime::CreateCalleeSaveMethod(kRefsAndArgs).
*
* TODO This is probably too conservative - saving FP & LR.
*/
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME
adrp xIP0, :got:_ZN3art7Runtime9instance_E
ldr xIP0, [xIP0, #:got_lo12:_ZN3art7Runtime9instance_E]
// Our registers aren't intermixed - just spill in order.
ldr xIP0, [xIP0] // xIP0 = & (art::Runtime * art::Runtime.instance_) .
// xIP0 = (ArtMethod*) Runtime.instance_.callee_save_methods[kRefAndArgs] .
ldr xIP0, [xIP0, RUNTIME_REFS_AND_ARGS_CALLEE_SAVE_FRAME_OFFSET ]
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_INTERNAL
str xIP0, [sp] // Store ArtMethod* Runtime::callee_save_methods_[kRefsAndArgs]
// Place sp in Thread::Current()->top_quick_frame.
mov xIP0, sp
str xIP0, [xSELF, # THREAD_TOP_QUICK_FRAME_OFFSET]
.endm
.macro SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME_WITH_METHOD_IN_X0
SETUP_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_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.
ldp x1, x2, [sp, #80]
.cfi_restore x1
.cfi_restore x2
ldp x3, x4, [sp, #96]
.cfi_restore x3
.cfi_restore x4
ldp x5, x6, [sp, #112]
.cfi_restore x5
.cfi_restore x6
// x7, Callee-saves.
ldp x7, x20, [sp, #128]
.cfi_restore x7
.cfi_restore x20
ldp x21, x22, [sp, #144]
.cfi_restore x21
.cfi_restore x22
ldp x23, x24, [sp, #160]
.cfi_restore x23
.cfi_restore x24
ldp x25, x26, [sp, #176]
.cfi_restore x25
.cfi_restore x26
ldp x27, x28, [sp, #192]
.cfi_restore x27
.cfi_restore x28
// x29(callee-save) and LR.
ldp x29, xLR, [sp, #208]
.cfi_restore x29
.cfi_restore x30
add sp, sp, #224
.cfi_adjust_cfa_offset -224
.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 set calls through to artDeliverPendingExceptionFromCode, where the pending
* exception is Thread::Current()->exception_
*/
.macro DELIVER_PENDING_EXCEPTION
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME
mov x0, xSELF
// Point of no return.
b artDeliverPendingExceptionFromCode // artDeliverPendingExceptionFromCode(Thread*)
brk 0 // Unreached
.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_SAVE_FRAME // save all registers as basis for long jump context
mov x0, xSELF // pass Thread::Current
b \cxx_name // \cxx_name(Thread*)
END \c_name
.endm
.macro ONE_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context.
mov x1, xSELF // pass Thread::Current.
b \cxx_name // \cxx_name(arg, Thread*).
brk 0
END \c_name
.endm
.macro TWO_ARG_RUNTIME_EXCEPTION c_name, cxx_name
.extern \cxx_name
ENTRY \c_name
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context
mov x2, xSELF // pass Thread::Current
b \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 art_quick_throw_null_pointer_exception, artThrowNullPointerExceptionFromCode
/*
* Called by managed code to create and deliver an ArithmeticException.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_div_zero, artThrowDivZeroFromCode
/*
* Called by managed code to create and deliver an ArrayIndexOutOfBoundsException. Arg1 holds
* index, arg2 holds limit.
*/
TWO_ARG_RUNTIME_EXCEPTION art_quick_throw_array_bounds, artThrowArrayBoundsFromCode
/*
* Called by managed code to create and deliver a StackOverflowError.
*/
NO_ARG_RUNTIME_EXCEPTION art_quick_throw_stack_overflow, artThrowStackOverflowFromCode
/*
* Called by managed code to create and deliver a NoSuchMethodError.
*/
ONE_ARG_RUNTIME_EXCEPTION art_quick_throw_no_such_method, artThrowNoSuchMethodFromCode
/*
* All generated callsites for interface invokes and invocation slow paths will load arguments
* as usual - except instead of loading arg0/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_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME
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
// 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.
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
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
// 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?
ldxr w1, [x4]
mov x3, x1
and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier 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
dmb ishld // full (LoadLoad|LoadStore) memory barrier
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
mov x3, x1 // copy the lock word to check count overflow.
and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier 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_READ_BARRIER_STATE_SHIFT // if either of the upper two bits (28-29) are 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_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case we block
mov x1, xSELF // pass Thread::Current
bl artLockObjectFromCode // (Object* obj, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_lock_object
/*
* 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]
mov x3, x1 // copy lock word to check thread id equality
and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier 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?
mov x3, x1 // copy lock word to detect transition to unlocked
and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK_TOGGLED // zero the read barrier bits
cmp w3, #LOCK_WORD_THIN_LOCK_COUNT_ONE
bpl .Lrecursive_thin_unlock
// transition to unlocked
mov x3, x1
and w3, w3, #LOCK_WORD_READ_BARRIER_STATE_MASK // w3: zero except for the preserved read barrier bits
dmb ish // full (LoadStore|StoreStore) memory barrier
#ifndef USE_READ_BARRIER
str w3, [x4]
#else
stxr 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_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case exception allocation triggers GC
mov x1, xSELF // pass Thread::Current
bl artUnlockObjectFromCode // (Object* obj, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_unlock_object
/*
* Entry from managed code that calls artIsAssignableFromCode and on failure calls
* artThrowClassCastException.
*/
.extern artThrowClassCastException
ENTRY art_quick_check_cast
// Store arguments and link register
// Stack needs to be 16B aligned on calls.
stp x0, x1, [sp,#-32]!
.cfi_adjust_cfa_offset 32
.cfi_rel_offset x0, 0
.cfi_rel_offset x1, 8
str xLR, [sp, #24]
.cfi_rel_offset x30, 24
// Call runtime code
bl artIsAssignableFromCode
// Check for exception
cbz x0, .Lthrow_class_cast_exception
// Restore and return
ldr xLR, [sp, #24]
.cfi_restore x30
ldp x0, x1, [sp], #32
.cfi_restore x0
.cfi_restore x1
.cfi_adjust_cfa_offset -32
ret
.cfi_adjust_cfa_offset 32 // Reset unwind info so following code unwinds.
.Lthrow_class_cast_exception:
// Restore
ldr xLR, [sp, #24]
.cfi_restore x30
ldp x0, x1, [sp], #32
.cfi_restore x0
.cfi_restore x1
.cfi_adjust_cfa_offset -32
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME // save all registers as basis for long jump context
mov x2, xSELF // pass Thread::Current
b artThrowClassCastException // (Class*, Class*, Thread*)
brk 0 // We should not return here...
END art_quick_check_cast
// 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
/*
* 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, offset
#ifdef USE_READ_BARRIER
// Store registers used in art_quick_aput_obj (x0-x4, LR), stack is 16B aligned.
stp x0, x1, [sp, #-48]!
.cfi_adjust_cfa_offset 48
.cfi_rel_offset x0, 0
.cfi_rel_offset x1, 8
stp x2, x3, [sp, #16]
.cfi_rel_offset x2, 16
.cfi_rel_offset x3, 24
stp x4, xLR, [sp, #32]
.cfi_rel_offset x4, 32
.cfi_rel_offset x30, 40
// 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
ldr xLR, [sp, #40]
.cfi_restore x30
add sp, sp, #48
.cfi_adjust_cfa_offset -48
#else
ldr \wDest, [\xObj, #\offset] // Heap reference = 32b. This also zero-extends to \xDest.
UNPOISON_HEAP_REF \wDest
#endif // USE_READ_BARRIER
.endm
/*
* Entry from managed code for array put operations of objects where the value being stored
* needs to be checked for compatibility.
* x0 = array, x1 = index, x2 = value
*
* Currently all values should fit into w0/w1/w2, and w1 always will as indices are 32b. We
* assume, though, that the upper 32b are zeroed out. At least for x1/w1 we can do better by
* using index-zero-extension in load/stores.
*
* Temporaries: x3, x4
* TODO: x4 OK? ip seems wrong here.
*/
ENTRY art_quick_aput_obj_with_null_and_bound_check
tst x0, x0
bne art_quick_aput_obj_with_bound_check
b art_quick_throw_null_pointer_exception
END art_quick_aput_obj_with_null_and_bound_check
ENTRY art_quick_aput_obj_with_bound_check
ldr w3, [x0, #MIRROR_ARRAY_LENGTH_OFFSET]
cmp w3, w1
bhi art_quick_aput_obj
mov x0, x1
mov x1, x3
b art_quick_throw_array_bounds
END art_quick_aput_obj_with_bound_check
#ifdef USE_READ_BARRIER
.extern artReadBarrierSlow
#endif
ENTRY art_quick_aput_obj
cbz x2, .Ldo_aput_null
READ_BARRIER x3, w3, x0, MIRROR_OBJECT_CLASS_OFFSET // Heap reference = 32b
// This also zero-extends to x3
READ_BARRIER x4, w4, x2, MIRROR_OBJECT_CLASS_OFFSET // Heap reference = 32b
// This also zero-extends to x4
READ_BARRIER x3, w3, x3, MIRROR_CLASS_COMPONENT_TYPE_OFFSET // Heap reference = 32b
// This also zero-extends to x3
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, #7
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
stp x0, x1, [sp,#-32]!
.cfi_adjust_cfa_offset 32
.cfi_rel_offset x0, 0
.cfi_rel_offset x1, 8
stp x2, xLR, [sp, #16]
.cfi_rel_offset x2, 16
.cfi_rel_offset x30, 24
// 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
ldp x2, x30, [sp, #16]
.cfi_restore x2
.cfi_restore x30
ldp x0, x1, [sp], #32
.cfi_restore x0
.cfi_restore x1
.cfi_adjust_cfa_offset -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, #7
strb w3, [x3, x0]
ret
.cfi_adjust_cfa_offset 32 // 4 restores after cbz for unwinding.
.Lthrow_array_store_exception:
ldp x2, x30, [sp, #16]
.cfi_restore x2
.cfi_restore x30
ldp x0, x1, [sp], #32
.cfi_restore x0
.cfi_restore x1
.cfi_adjust_cfa_offset -32
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME
mov x1, x2 // Pass value.
mov x2, xSELF // Pass Thread::Current.
b 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_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
mov x1, xSELF // pass Thread::Current
bl \entrypoint // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro TWO_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
mov x2, xSELF // pass Thread::Current
bl \entrypoint // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro THREE_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
mov x3, xSELF // pass Thread::Current
bl \entrypoint
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
// Macro to facilitate adding new allocation entrypoints.
.macro FOUR_ARG_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
mov x4, xSELF // pass Thread::Current
bl \entrypoint //
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
DELIVER_PENDING_EXCEPTION
END \name
.endm
// Macros taking opportunity of code similarities for downcalls with referrer.
.macro ONE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer
mov x2, xSELF // pass Thread::Current
bl \entrypoint // (uint32_t type_idx, Method* method, Thread*, SP)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
.macro TWO_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
ldr x2, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer
mov x3, xSELF // pass Thread::Current
bl \entrypoint
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.endm
.macro THREE_ARG_REF_DOWNCALL name, entrypoint, return
.extern \entrypoint
ENTRY \name
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
ldr x3, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer
mov x4, xSELF // pass Thread::Current
bl \entrypoint
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
\return
END \name
.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_DOWNCALL art_quick_initialize_static_storage, artInitializeStaticStorageFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
ONE_ARG_DOWNCALL art_quick_initialize_type, artInitializeTypeFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
ONE_ARG_DOWNCALL art_quick_initialize_type_and_verify_access, artInitializeTypeAndVerifyAccessFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
ONE_ARG_REF_DOWNCALL art_quick_get_boolean_static, artGetBooleanStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_byte_static, artGetByteStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_char_static, artGetCharStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_short_static, artGetShortStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get32_static, artGet32StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get64_static, artGet64StaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
ONE_ARG_REF_DOWNCALL art_quick_get_obj_static, artGetObjStaticFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_boolean_instance, artGetBooleanInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_byte_instance, artGetByteInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_char_instance, artGetCharInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_short_instance, artGetShortInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get32_instance, artGet32InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get64_instance, artGet64InstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_get_obj_instance, artGetObjInstanceFromCode, RETURN_OR_DELIVER_PENDING_EXCEPTION_X1
TWO_ARG_REF_DOWNCALL art_quick_set8_static, artSet8StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set16_static, artSet16StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set32_static, artSet32StaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
TWO_ARG_REF_DOWNCALL art_quick_set_obj_static, artSetObjStaticFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set8_instance, artSet8InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set16_instance, artSet16InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set32_instance, artSet32InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set64_instance, artSet64InstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
THREE_ARG_REF_DOWNCALL art_quick_set_obj_instance, artSetObjInstanceFromCode, RETURN_IF_W0_IS_ZERO_OR_DELIVER
// This is separated out as the argument order is different.
.extern artSet64StaticFromCode
ENTRY art_quick_set64_static
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
ldr x1, [sp, #FRAME_SIZE_REFS_ONLY_CALLEE_SAVE] // Load referrer
// x2 contains the parameter
mov x3, xSELF // pass Thread::Current
bl artSet64StaticFromCode
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_W0_IS_ZERO_OR_DELIVER
END art_quick_set64_static
/*
* Entry from managed code to resolve a string, this stub will allocate a String and deliver an
* exception on error. On success the String is returned. w0 holds the string index. The fast
* path check for hit in strings cache has already been performed.
*/
ONE_ARG_DOWNCALL art_quick_resolve_string, artResolveStringFromCode, RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
// Generate the allocation entrypoints for each allocator.
GENERATE_ALLOC_ENTRYPOINTS_FOR_EACH_ALLOCATOR
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_rosalloc, RosAlloc).
ENTRY art_quick_alloc_object_rosalloc
// Fast path rosalloc allocation.
// x0: type_idx/return value, x1: ArtMethod*, xSELF(x19): Thread::Current
// x2-x7: free.
ldr x2, [x1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_64] // Load dex cache resolved types array
// Load the class (x2)
ldr w2, [x2, x0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
cbz x2, .Lart_quick_alloc_object_rosalloc_slow_path // Check null class
// Check class status.
ldr w3, [x2, #MIRROR_CLASS_STATUS_OFFSET]
cmp x3, #MIRROR_CLASS_STATUS_INITIALIZED
bne .Lart_quick_alloc_object_rosalloc_slow_path
// Add a fake dependence from the
// following access flag and size
// loads to the status load.
// This is to prevent those loads
// from being reordered above the
// status load and reading wrong
// values (an alternative is to use
// a load-acquire for the status).
eor x3, x3, x3
add x2, x2, x3
// Check access flags has
// kAccClassIsFinalizable
ldr w3, [x2, #MIRROR_CLASS_ACCESS_FLAGS_OFFSET]
tst x3, #ACCESS_FLAGS_CLASS_IS_FINALIZABLE
bne .Lart_quick_alloc_object_rosalloc_slow_path
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 .Lart_quick_alloc_object_rosalloc_slow_path
ldr w3, [x2, #MIRROR_CLASS_OBJECT_SIZE_OFFSET] // Load the object size (x3)
cmp x3, #ROSALLOC_MAX_THREAD_LOCAL_BRACKET_SIZE // Check if the size is for a thread
// local allocation
bhs .Lart_quick_alloc_object_rosalloc_slow_path
// Compute the rosalloc bracket index
// from the size.
// Align up the size by the rosalloc
// bracket quantum size and divide
// by the quantum size and subtract
// by 1. This code is a shorter but
// equivalent version.
sub x3, x3, #1
lsr x3, x3, #ROSALLOC_BRACKET_QUANTUM_SIZE_SHIFT
// Load the rosalloc run (x4)
add x4, xSELF, x3, lsl #POINTER_SIZE_SHIFT
ldr x4, [x4, #THREAD_ROSALLOC_RUNS_OFFSET]
// 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, .Lart_quick_alloc_object_rosalloc_slow_path
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber 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 w2
str w2, [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
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)]
// Fence. This is "ish" not "ishst" so
// that the code after this allocation
// site will see the right values in
// the fields of the class.
// Alternatively we could use "ishst"
// if we use load-acquire for the
// class status load.)
dmb ish
mov x0, x3 // Set the return value and return.
ret
.Lart_quick_alloc_object_rosalloc_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves in case of GC
mov x2, xSELF // pass Thread::Current
bl artAllocObjectFromCodeRosAlloc // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_rosalloc
// The common fast path code for art_quick_alloc_object_tlab and art_quick_alloc_object_region_tlab.
//
// x0: type_idx/return value, x1: ArtMethod*, x2: Class*, xSELF(x19): Thread::Current
// x3-x7: free.
// Need to preserve x0 and x1 to the slow path.
.macro ALLOC_OBJECT_TLAB_FAST_PATH slowPathLabel
cbz x2, \slowPathLabel // Check null class
// Check class status.
ldr w3, [x2, #MIRROR_CLASS_STATUS_OFFSET]
cmp x3, #MIRROR_CLASS_STATUS_INITIALIZED
bne \slowPathLabel
// Add a fake dependence from the
// following access flag and size
// loads to the status load.
// This is to prevent those loads
// from being reordered above the
// status load and reading wrong
// values (an alternative is to use
// a load-acquire for the status).
eor x3, x3, x3
add x2, x2, x3
// Check access flags has
// kAccClassIsFinalizable.
ldr w3, [x2, #MIRROR_CLASS_ACCESS_FLAGS_OFFSET]
tbnz x3, #ACCESS_FLAGS_CLASS_IS_FINALIZABLE_BIT, \slowPathLabel
// Load thread_local_pos (x4) and
// thread_local_end (x5).
ldr x4, [xSELF, #THREAD_LOCAL_POS_OFFSET]
ldr x5, [xSELF, #THREAD_LOCAL_END_OFFSET]
sub x6, x5, x4 // Compute the remaining buf size.
ldr w7, [x2, #MIRROR_CLASS_OBJECT_SIZE_OFFSET] // Load the object size (x7).
cmp x7, x6 // Check if it fits. OK to do this
// before rounding up the object size
// assuming the buf size alignment.
bhi \slowPathLabel
// "Point of no slow path". Won't go to the slow path from here on. OK to clobber x0 and x1.
// Round up the object size by the
// object alignment. (addr + 7) & ~7.
add x7, x7, #OBJECT_ALIGNMENT_MASK
and x7, x7, #OBJECT_ALIGNMENT_MASK_TOGGLED
// Move old thread_local_pos to x0
// for the return value.
mov x0, x4
add x5, x0, x7
str x5, [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 w2
str w2, [x0, #MIRROR_OBJECT_CLASS_OFFSET] // Store the class pointer.
// Fence. This is "ish" not "ishst" so
// that the code after this allocation
// site will see the right values in
// the fields of the class.
// Alternatively we could use "ishst"
// if we use load-acquire for the
// class status load.)
dmb ish
ret
.endm
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_tlab, TLAB).
ENTRY art_quick_alloc_object_tlab
// Fast path tlab allocation.
// x0: type_idx/return value, x1: ArtMethod*, xSELF(x19): Thread::Current
// x2-x7: free.
#if defined(USE_READ_BARRIER)
mvn x0, xzr // Read barrier not supported here.
ret // Return -1.
#endif
ldr x2, [x1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_64] // Load dex cache resolved types array
// Load the class (x2)
ldr w2, [x2, x0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
ALLOC_OBJECT_TLAB_FAST_PATH .Lart_quick_alloc_object_tlab_slow_path
.Lart_quick_alloc_object_tlab_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // Save callee saves in case of GC.
mov x2, xSELF // Pass Thread::Current.
bl artAllocObjectFromCodeTLAB // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_tlab
// A hand-written override for GENERATE_ALLOC_ENTRYPOINTS_ALLOC_OBJECT(_region_tlab, RegionTLAB)
ENTRY art_quick_alloc_object_region_tlab
// Fast path region tlab allocation.
// x0: type_idx/return value, x1: ArtMethod*, xSELF(x19): Thread::Current
// x2-x7: free.
#if !defined(USE_READ_BARRIER)
mvn x0, xzr // Read barrier must be enabled here.
ret // Return -1.
#endif
ldr x2, [x1, #ART_METHOD_DEX_CACHE_TYPES_OFFSET_64] // Load dex cache resolved types array
// Load the class (x2)
ldr w2, [x2, x0, lsl #COMPRESSED_REFERENCE_SIZE_SHIFT]
// Read barrier for class load.
ldr w3, [xSELF, #THREAD_IS_GC_MARKING_OFFSET]
cbnz x3, .Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path
.Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path_exit:
ALLOC_OBJECT_TLAB_FAST_PATH .Lart_quick_alloc_object_region_tlab_slow_path
.Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path:
// The read barrier slow path. Mark
// the class.
stp x0, x1, [sp, #-32]! // Save registers (x0, x1, lr).
str xLR, [sp, #16] // Align sp by 16 bytes.
mov x0, x2 // Pass the class as the first param.
bl artReadBarrierMark
mov x2, x0 // Get the (marked) class back.
ldp x0, x1, [sp, #0] // Restore registers.
ldr xLR, [sp, #16]
add sp, sp, #32
b .Lart_quick_alloc_object_region_tlab_class_load_read_barrier_slow_path_exit
.Lart_quick_alloc_object_region_tlab_slow_path:
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // Save callee saves in case of GC.
mov x2, xSELF // Pass Thread::Current.
bl artAllocObjectFromCodeRegionTLAB // (uint32_t type_idx, Method* method, Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME
RETURN_IF_RESULT_IS_NON_ZERO_OR_DELIVER
END art_quick_alloc_object_region_tlab
/*
* Called by managed code when the thread has been asked to suspend.
*/
.extern artTestSuspendFromCode
ENTRY art_quick_test_suspend
ldrh w0, [xSELF, #THREAD_FLAGS_OFFSET] // get xSELF->state_and_flags.as_struct.flags
cbnz w0, .Lneed_suspend // check flags == 0
ret // return if flags == 0
.Lneed_suspend:
mov x0, xSELF
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl
bl artTestSuspendFromCode // (Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
END art_quick_test_suspend
ENTRY art_quick_implicit_suspend
mov x0, xSELF
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME // save callee saves for stack crawl
bl artTestSuspendFromCode // (Thread*)
RESTORE_REFS_ONLY_CALLEE_SAVE_FRAME_AND_RETURN
END art_quick_implicit_suspend
/*
* Called by managed code that is attempting to call a method on a proxy class. On entry
* 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_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Restore frame
fmov d0, x0 // Store result in d0 in case it was float or double
ret // return on success
.Lexception_in_proxy:
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_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, and x0.
*/
.extern artInvokeInterfaceTrampoline
ENTRY art_quick_imt_conflict_trampoline
ldr xIP0, [sp, #0] // Load referrer
ldr xIP0, [xIP0, #ART_METHOD_DEX_CACHE_METHODS_OFFSET_64] // Load dex cache methods array
ldr xIP0, [xIP0, xIP1, lsl #POINTER_SIZE_SHIFT] // Load 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, xIP0
// 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 successuflly 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.
INVOKE_TRAMPOLINE_BODY artInvokeInterfaceTrampoline
END art_quick_imt_conflict_trampoline
ENTRY art_quick_resolution_trampoline
SETUP_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME
br xIP0
1:
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME
// 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_REFS_AND_ARGS_CALLEE_SAVE_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_REFS_AND_ARGS_CALLEE_SAVE_FRAME // TODO: no need to restore arguments in this case.
fmov d0, x0
RETURN_OR_DELIVER_PENDING_EXCEPTION
END art_quick_to_interpreter_bridge
//
// Instrumentation-related stubs
//
.extern artInstrumentationMethodEntryFromCode
ENTRY art_quick_instrumentation_entry
SETUP_REFS_AND_ARGS_CALLEE_SAVE_FRAME
mov x20, x0 // Preserve method reference in a callee-save.
mov x2, xSELF
mov x3, xLR
bl artInstrumentationMethodEntryFromCode // (Method*, Object*, Thread*, LR)
mov xIP0, x0 // x0 = result of call.
mov x0, x20 // Reload method reference.
RESTORE_REFS_AND_ARGS_CALLEE_SAVE_FRAME // Note: will restore xSELF
adr xLR, art_quick_instrumentation_exit
br xIP0 // Tail-call method with lr set to art_quick_instrumentation_exit.
END art_quick_instrumentation_entry
.extern artInstrumentationMethodExitFromCode
ENTRY art_quick_instrumentation_exit
mov xLR, #0 // Clobber LR for later checks.
SETUP_REFS_ONLY_CALLEE_SAVE_FRAME
// We need to save x0 and d0. We could use a callee-save from SETUP_REF_ONLY, but then
// we would need to fully restore it. As there are a lot of callee-save registers, it seems
// easier to have an extra small stack area.
str x0, [sp, #-16]! // Save integer result.
.cfi_adjust_cfa_offset 16
str d0, [sp, #8] // Save floating-point result.
add x1, sp, #16 // Pass SP.
mov x2, x0 // Pass integer result.
fmov x3, d0 // Pass floating-point result.
mov x0, xSELF // Pass Thread.
bl artInstrumentationMethodExitFromCode // (Thread*, SP, gpr_res, fpr_res)
mov xIP0, x0 // Return address from instrumentation call.
mov xLR, x1 // r1 is holding link register if we're to bounce to deoptimize
ldr d0, [sp, #8] // Restore floating-point result.
ldr x0, [sp], 16 // Restore integer result, and drop stack area.
.cfi_adjust_cfa_offset 16
POP_REFS_ONLY_CALLEE_SAVE_FRAME
br xIP0 // Tail-call out.
END art_quick_instrumentation_exit
/*
* Instrumentation has requested that we deoptimize into the interpreter. The deoptimization
* will long jump to the upcall with a special exception of -1.
*/
.extern artDeoptimize
ENTRY art_quick_deoptimize
SETUP_SAVE_ALL_CALLEE_SAVE_FRAME
mov x0, xSELF // Pass thread.
bl artDeoptimize // 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_ALL_CALLEE_SAVE_FRAME
mov x0, xSELF // Pass thread.
bl artDeoptimizeFromCompiledCode // artDeoptimizeFromCompiledCode(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
ldr w3, [x0, #MIRROR_STRING_COUNT_OFFSET]
add x0, x0, #MIRROR_STRING_VALUE_OFFSET
/* 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
/* 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
END art_quick_indexof
/*
* String's compareTo.
*
* TODO: Not very optimized.
*
* On entry:
* x0: this object pointer
* x1: comp object pointer
*
*/
.extern __memcmp16
ENTRY art_quick_string_compareto
mov x2, x0 // x0 is return, use x2 for first input.
sub x0, x2, x1 // Same string object?
cbnz x0,1f
ret
1: // Different string objects.
ldr w4, [x2, #MIRROR_STRING_COUNT_OFFSET]
ldr w3, [x1, #MIRROR_STRING_COUNT_OFFSET]
add x2, x2, #MIRROR_STRING_VALUE_OFFSET
add x1, x1, #MIRROR_STRING_VALUE_OFFSET
/*
* Now: Data* Count
* first arg x2 w4
* second arg x1 w3
*/
// x0 := str1.length(w4) - str2.length(w3). ldr zero-extended w3/w4 into x3/x4.
subs x0, x4, x3
// Min(count1, count2) into w3.
csel x3, x3, x4, ge
// TODO: Tune this value.
// Check for long string, do memcmp16 for them.
cmp w3, #28 // Constant from arm32.
bgt .Ldo_memcmp16
/*
* Now:
* x2: *first string data
* x1: *second string data
* w3: iteration count
* x0: return value if comparison equal
* x4, x5, x6, x7: free
*/
// Do a simple unrolled loop.
.Lloop:
// At least two more elements?
subs w3, w3, #2
b.lt .Lremainder_or_done
ldrh w4, [x2], #2
ldrh w5, [x1], #2
ldrh w6, [x2], #2
ldrh w7, [x1], #2
subs w4, w4, w5
b.ne .Lw4_result
subs w6, w6, w7
b.ne .Lw6_result
b .Lloop
.Lremainder_or_done:
adds w3, w3, #1
b.eq .Lremainder
ret
.Lremainder:
ldrh w4, [x2], #2
ldrh w5, [x1], #2
subs w4, w4, w5
b.ne .Lw4_result
ret
// Result is in w4
.Lw4_result:
sxtw x0, w4
ret
// Result is in w6
.Lw6_result:
sxtw x0, w6
ret
.Ldo_memcmp16:
mov x14, x0 // Save x0 and LR. __memcmp16 does not use these temps.
mov x15, xLR // TODO: Codify and check that?
mov x0, x2
uxtw x2, w3
bl __memcmp16
mov xLR, x15 // Restore LR.
cmp x0, #0 // Check the memcmp difference.
csel x0, x0, x14, ne // x0 := x0 != 0 ? x14(prev x0=length diff) : x1.
ret
END art_quick_string_compareto