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      1 /*
      2  * Copyright (C) 2016 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 "linker/relative_patcher_test.h"
     18 #include "linker/mips/relative_patcher_mips.h"
     19 
     20 namespace art {
     21 namespace linker {
     22 
     23 class Mips32r6RelativePatcherTest : public RelativePatcherTest {
     24  public:
     25   Mips32r6RelativePatcherTest() : RelativePatcherTest(kMips, "mips32r6") {}
     26 
     27  protected:
     28   static const uint8_t kUnpatchedPcRelativeRawCode[];
     29   static const uint32_t kLiteralOffset;
     30   static const uint32_t kAnchorOffset;
     31   static const ArrayRef<const uint8_t> kUnpatchedPcRelativeCode;
     32 
     33   uint32_t GetMethodOffset(uint32_t method_idx) {
     34     auto result = method_offset_map_.FindMethodOffset(MethodRef(method_idx));
     35     CHECK(result.first);
     36     return result.second;
     37   }
     38 
     39   void CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, uint32_t target_offset);
     40   void TestDexCacheReference(uint32_t dex_cache_arrays_begin, uint32_t element_offset);
     41   void TestStringReference(uint32_t string_offset);
     42 };
     43 
     44 const uint8_t Mips32r6RelativePatcherTest::kUnpatchedPcRelativeRawCode[] = {
     45     0x34, 0x12, 0x5E, 0xEE,  // auipc s2, high(diff); placeholder = 0x1234
     46     0x78, 0x56, 0x52, 0x26,  // addiu s2, s2, low(diff); placeholder = 0x5678
     47 };
     48 const uint32_t Mips32r6RelativePatcherTest::kLiteralOffset = 0;  // At auipc (where
     49                                                                  // patching starts).
     50 const uint32_t Mips32r6RelativePatcherTest::kAnchorOffset = 0;  // At auipc (where PC+0 points).
     51 const ArrayRef<const uint8_t> Mips32r6RelativePatcherTest::kUnpatchedPcRelativeCode(
     52     kUnpatchedPcRelativeRawCode);
     53 
     54 void Mips32r6RelativePatcherTest::CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches,
     55                                                        uint32_t target_offset) {
     56   AddCompiledMethod(MethodRef(1u), kUnpatchedPcRelativeCode, ArrayRef<const LinkerPatch>(patches));
     57   Link();
     58 
     59   auto result = method_offset_map_.FindMethodOffset(MethodRef(1u));
     60   ASSERT_TRUE(result.first);
     61 
     62   uint32_t diff = target_offset - (result.second + kAnchorOffset);
     63   diff += (diff & 0x8000) << 1;  // Account for sign extension in addiu.
     64 
     65   const uint8_t expected_code[] = {
     66       static_cast<uint8_t>(diff >> 16), static_cast<uint8_t>(diff >> 24), 0x5E, 0xEE,
     67       static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x26,
     68   };
     69   EXPECT_TRUE(CheckLinkedMethod(MethodRef(1u), ArrayRef<const uint8_t>(expected_code)));
     70 }
     71 
     72 void Mips32r6RelativePatcherTest::TestDexCacheReference(uint32_t dex_cache_arrays_begin,
     73                                                         uint32_t element_offset) {
     74   dex_cache_arrays_begin_ = dex_cache_arrays_begin;
     75   LinkerPatch patches[] = {
     76       LinkerPatch::DexCacheArrayPatch(kLiteralOffset, nullptr, kAnchorOffset, element_offset)
     77   };
     78   CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches),
     79                        dex_cache_arrays_begin_ + element_offset);
     80 }
     81 
     82 void Mips32r6RelativePatcherTest::TestStringReference(uint32_t string_offset) {
     83   constexpr uint32_t kStringIndex = 1u;
     84   string_index_to_offset_map_.Put(kStringIndex, string_offset);
     85   LinkerPatch patches[] = {
     86       LinkerPatch::RelativeStringPatch(kLiteralOffset, nullptr, kAnchorOffset, kStringIndex)
     87   };
     88   CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), string_offset);
     89 }
     90 
     91 TEST_F(Mips32r6RelativePatcherTest, DexCacheReference) {
     92   TestDexCacheReference(/* dex_cache_arrays_begin */ 0x12345678, /* element_offset */ 0x1234);
     93 }
     94 
     95 TEST_F(Mips32r6RelativePatcherTest, StringReference) {
     96   TestStringReference(/* string_offset*/ 0x87651234);
     97 }
     98 
     99 }  // namespace linker
    100 }  // namespace art
    101