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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "assembler.h"
     18 
     19 #include <algorithm>
     20 #include <vector>
     21 
     22 #include "arm/assembler_arm32.h"
     23 #include "arm/assembler_thumb2.h"
     24 #include "arm64/assembler_arm64.h"
     25 #include "mips/assembler_mips.h"
     26 #include "mips64/assembler_mips64.h"
     27 #include "x86/assembler_x86.h"
     28 #include "x86_64/assembler_x86_64.h"
     29 #include "globals.h"
     30 #include "memory_region.h"
     31 
     32 namespace art {
     33 
     34 static uint8_t* NewContents(size_t capacity) {
     35   return new uint8_t[capacity];
     36 }
     37 
     38 
     39 AssemblerBuffer::AssemblerBuffer() {
     40   static const size_t kInitialBufferCapacity = 4 * KB;
     41   contents_ = NewContents(kInitialBufferCapacity);
     42   cursor_ = contents_;
     43   limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
     44   fixup_ = nullptr;
     45   slow_path_ = nullptr;
     46 #ifndef NDEBUG
     47   has_ensured_capacity_ = false;
     48   fixups_processed_ = false;
     49 #endif
     50 
     51   // Verify internal state.
     52   CHECK_EQ(Capacity(), kInitialBufferCapacity);
     53   CHECK_EQ(Size(), 0U);
     54 }
     55 
     56 
     57 AssemblerBuffer::~AssemblerBuffer() {
     58   delete[] contents_;
     59 }
     60 
     61 
     62 void AssemblerBuffer::ProcessFixups(const MemoryRegion& region) {
     63   AssemblerFixup* fixup = fixup_;
     64   while (fixup != nullptr) {
     65     fixup->Process(region, fixup->position());
     66     fixup = fixup->previous();
     67   }
     68 }
     69 
     70 
     71 void AssemblerBuffer::FinalizeInstructions(const MemoryRegion& instructions) {
     72   // Copy the instructions from the buffer.
     73   MemoryRegion from(reinterpret_cast<void*>(contents()), Size());
     74   instructions.CopyFrom(0, from);
     75   // Process fixups in the instructions.
     76   ProcessFixups(instructions);
     77 #ifndef NDEBUG
     78   fixups_processed_ = true;
     79 #endif
     80 }
     81 
     82 
     83 void AssemblerBuffer::ExtendCapacity() {
     84   size_t old_size = Size();
     85   size_t old_capacity = Capacity();
     86   size_t new_capacity = std::min(old_capacity * 2, old_capacity + 1 * MB);
     87 
     88   // Allocate the new data area and copy contents of the old one to it.
     89   uint8_t* new_contents = NewContents(new_capacity);
     90   memmove(reinterpret_cast<void*>(new_contents),
     91           reinterpret_cast<void*>(contents_),
     92           old_size);
     93 
     94   // Compute the relocation delta and switch to the new contents area.
     95   ptrdiff_t delta = new_contents - contents_;
     96   delete[] contents_;
     97   contents_ = new_contents;
     98 
     99   // Update the cursor and recompute the limit.
    100   cursor_ += delta;
    101   limit_ = ComputeLimit(new_contents, new_capacity);
    102 
    103   // Verify internal state.
    104   CHECK_EQ(Capacity(), new_capacity);
    105   CHECK_EQ(Size(), old_size);
    106 }
    107 
    108 void DebugFrameOpCodeWriterForAssembler::ImplicitlyAdvancePC() {
    109   this->AdvancePC(assembler_->CodeSize());
    110 }
    111 
    112 Assembler* Assembler::Create(InstructionSet instruction_set) {
    113   switch (instruction_set) {
    114     case kArm:
    115       return new arm::Arm32Assembler();
    116     case kThumb2:
    117       return new arm::Thumb2Assembler();
    118     case kArm64:
    119       return new arm64::Arm64Assembler();
    120     case kMips:
    121       return new mips::MipsAssembler();
    122     case kMips64:
    123       return new mips64::Mips64Assembler();
    124     case kX86:
    125       return new x86::X86Assembler();
    126     case kX86_64:
    127       return new x86_64::X86_64Assembler();
    128     default:
    129       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
    130       return nullptr;
    131   }
    132 }
    133 
    134 void Assembler::StoreImmediateToThread32(ThreadOffset<4> dest ATTRIBUTE_UNUSED,
    135                                          uint32_t imm ATTRIBUTE_UNUSED,
    136                                          ManagedRegister scratch ATTRIBUTE_UNUSED) {
    137   UNIMPLEMENTED(FATAL);
    138 }
    139 
    140 void Assembler::StoreImmediateToThread64(ThreadOffset<8> dest ATTRIBUTE_UNUSED,
    141                                          uint32_t imm ATTRIBUTE_UNUSED,
    142                                          ManagedRegister scratch ATTRIBUTE_UNUSED) {
    143   UNIMPLEMENTED(FATAL);
    144 }
    145 
    146 void Assembler::StoreStackOffsetToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    147                                            FrameOffset fr_offs ATTRIBUTE_UNUSED,
    148                                            ManagedRegister scratch ATTRIBUTE_UNUSED) {
    149   UNIMPLEMENTED(FATAL);
    150 }
    151 
    152 void Assembler::StoreStackOffsetToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    153                                            FrameOffset fr_offs ATTRIBUTE_UNUSED,
    154                                            ManagedRegister scratch ATTRIBUTE_UNUSED) {
    155   UNIMPLEMENTED(FATAL);
    156 }
    157 
    158 void Assembler::StoreStackPointerToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED) {
    159   UNIMPLEMENTED(FATAL);
    160 }
    161 
    162 void Assembler::StoreStackPointerToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED) {
    163   UNIMPLEMENTED(FATAL);
    164 }
    165 
    166 void Assembler::LoadFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
    167                                  ThreadOffset<4> src ATTRIBUTE_UNUSED,
    168                                  size_t size ATTRIBUTE_UNUSED) {
    169   UNIMPLEMENTED(FATAL);
    170 }
    171 
    172 void Assembler::LoadFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
    173                                  ThreadOffset<8> src ATTRIBUTE_UNUSED,
    174                                  size_t size ATTRIBUTE_UNUSED) {
    175   UNIMPLEMENTED(FATAL);
    176 }
    177 
    178 void Assembler::LoadRawPtrFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
    179                                        ThreadOffset<4> offs ATTRIBUTE_UNUSED) {
    180   UNIMPLEMENTED(FATAL);
    181 }
    182 
    183 void Assembler::LoadRawPtrFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
    184                                        ThreadOffset<8> offs ATTRIBUTE_UNUSED) {
    185   UNIMPLEMENTED(FATAL);
    186 }
    187 
    188 void Assembler::CopyRawPtrFromThread32(FrameOffset fr_offs ATTRIBUTE_UNUSED,
    189                                        ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    190                                        ManagedRegister scratch ATTRIBUTE_UNUSED) {
    191   UNIMPLEMENTED(FATAL);
    192 }
    193 
    194 void Assembler::CopyRawPtrFromThread64(FrameOffset fr_offs ATTRIBUTE_UNUSED,
    195                                        ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    196                                        ManagedRegister scratch ATTRIBUTE_UNUSED) {
    197   UNIMPLEMENTED(FATAL);
    198 }
    199 
    200 void Assembler::CopyRawPtrToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    201                                      FrameOffset fr_offs ATTRIBUTE_UNUSED,
    202                                      ManagedRegister scratch ATTRIBUTE_UNUSED) {
    203   UNIMPLEMENTED(FATAL);
    204 }
    205 
    206 void Assembler::CopyRawPtrToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    207                                      FrameOffset fr_offs ATTRIBUTE_UNUSED,
    208                                      ManagedRegister scratch ATTRIBUTE_UNUSED) {
    209   UNIMPLEMENTED(FATAL);
    210 }
    211 
    212 void Assembler::CallFromThread32(ThreadOffset<4> offset ATTRIBUTE_UNUSED,
    213                                  ManagedRegister scratch ATTRIBUTE_UNUSED) {
    214   UNIMPLEMENTED(FATAL);
    215 }
    216 
    217 void Assembler::CallFromThread64(ThreadOffset<8> offset ATTRIBUTE_UNUSED,
    218                                  ManagedRegister scratch ATTRIBUTE_UNUSED) {
    219   UNIMPLEMENTED(FATAL);
    220 }
    221 
    222 }  // namespace art
    223