runtime/arch/arm64/asm_support_arm64.S

/*
 * 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.
 */

#ifndef ART_RUNTIME_ARCH_ARM64_ASM_SUPPORT_ARM64_S_
#define ART_RUNTIME_ARCH_ARM64_ASM_SUPPORT_ARM64_S_

#include "asm_support_arm64.h"

// Define special registers.

// Register holding Thread::Current().
#define xSELF x19
// Frame Pointer
#define xFP   x29
// Link Register
#define xLR   x30
// Define the intraprocedural linkage temporary registers.
#define xIP0 x16
#define wIP0 w16
#define xIP1 x17
#define wIP1 w17

#if defined(USE_READ_BARRIER) && defined(USE_BAKER_READ_BARRIER)
// Marking Register, holding Thread::Current()->GetIsGcMarking().
// Only used with the Concurrent Copying (CC) garbage
// collector, with the Baker read barrier configuration.
#define wMR w20
#endif

.macro ENTRY_ALIGNED name, alignment
    .type \name, #function
    .hidden \name  // Hide this as a global symbol, so we do not incur plt calls.
    .global \name
    // ART-compiled functions have OatQuickMethodHeader but assembly funtions do not.
    // Prefix the assembly code with 0xFFs, which means there is no method header.
    .byte 0xFF, 0xFF, 0xFF, 0xFF
    // Cache alignment for function entry.
    // NB: 0xFF because there is a bug in balign where 0x00 creates nop instructions.
    .balign \alignment, 0xFF
\name:
    .cfi_startproc
.endm

.macro ENTRY name
    ENTRY_ALIGNED \name, 16
.endm

.macro END name
    .cfi_endproc
    .size \name, .-\name
.endm

.macro UNIMPLEMENTED name
    ENTRY \name
    brk 0
    END \name
.endm

// Macro to poison (negate) the reference for heap poisoning.
.macro POISON_HEAP_REF rRef
#ifdef USE_HEAP_POISONING
    neg \rRef, \rRef
#endif  // USE_HEAP_POISONING
.endm

// Macro to unpoison (negate) the reference for heap poisoning.
.macro UNPOISON_HEAP_REF rRef
#ifdef USE_HEAP_POISONING
    neg \rRef, \rRef
#endif  // USE_HEAP_POISONING
.endm

#endif  // ART_RUNTIME_ARCH_ARM64_ASM_SUPPORT_ARM64_S_