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/mips/relative_patcher_mips.h" 18 19 #include "linker/relative_patcher_test.h" 20 21 namespace art { 22 namespace linker { 23 24 class MipsRelativePatcherTest : public RelativePatcherTest { 25 public: 26 MipsRelativePatcherTest() : RelativePatcherTest(InstructionSet::kMips, "mips32r2") {} 27 28 protected: 29 static const uint8_t kUnpatchedPcRelativeRawCode[]; 30 static const uint32_t kLiteralOffsetHigh; 31 static const uint32_t kLiteralOffsetLow1; 32 static const uint32_t kLiteralOffsetLow2; 33 static const uint32_t kAnchorOffset; 34 static const ArrayRef<const uint8_t> kUnpatchedPcRelativeCode; 35 36 uint32_t GetMethodOffset(uint32_t method_idx) { 37 auto result = method_offset_map_.FindMethodOffset(MethodRef(method_idx)); 38 CHECK(result.first); 39 return result.second; 40 } 41 42 void CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, uint32_t target_offset); 43 void TestStringBssEntry(uint32_t bss_begin, uint32_t string_entry_offset); 44 void TestStringReference(uint32_t string_offset); 45 }; 46 47 const uint8_t MipsRelativePatcherTest::kUnpatchedPcRelativeRawCode[] = { 48 0x00, 0x00, 0x10, 0x04, // nal 49 0x34, 0x12, 0x12, 0x3C, // lui s2, high(diff); placeholder = 0x1234 50 0x21, 0x90, 0x5F, 0x02, // addu s2, s2, ra 51 0x78, 0x56, 0x52, 0x26, // addiu s2, s2, low(diff); placeholder = 0x5678 52 0x78, 0x56, 0x52, 0x8E, // lw s2, (low(diff))(s2) ; placeholder = 0x5678 53 }; 54 const uint32_t MipsRelativePatcherTest::kLiteralOffsetHigh = 4; // At lui. 55 const uint32_t MipsRelativePatcherTest::kLiteralOffsetLow1 = 12; // At addiu. 56 const uint32_t MipsRelativePatcherTest::kLiteralOffsetLow2 = 16; // At lw. 57 const uint32_t MipsRelativePatcherTest::kAnchorOffset = 8; // At addu (where PC+0 points). 58 const ArrayRef<const uint8_t> MipsRelativePatcherTest::kUnpatchedPcRelativeCode( 59 kUnpatchedPcRelativeRawCode); 60 61 void MipsRelativePatcherTest::CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, 62 uint32_t target_offset) { 63 AddCompiledMethod(MethodRef(1u), kUnpatchedPcRelativeCode, ArrayRef<const LinkerPatch>(patches)); 64 Link(); 65 66 auto result = method_offset_map_.FindMethodOffset(MethodRef(1u)); 67 ASSERT_TRUE(result.first); 68 69 uint32_t diff = target_offset - (result.second + kAnchorOffset); 70 diff += (diff & 0x8000) << 1; // Account for sign extension in addiu/lw. 71 72 const uint8_t expected_code[] = { 73 0x00, 0x00, 0x10, 0x04, 74 static_cast<uint8_t>(diff >> 16), static_cast<uint8_t>(diff >> 24), 0x12, 0x3C, 75 0x21, 0x90, 0x5F, 0x02, 76 static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x26, 77 static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x8E, 78 }; 79 EXPECT_TRUE(CheckLinkedMethod(MethodRef(1u), ArrayRef<const uint8_t>(expected_code))); 80 } 81 82 void MipsRelativePatcherTest::TestStringBssEntry(uint32_t bss_begin, 83 uint32_t string_entry_offset) { 84 constexpr uint32_t kStringIndex = 1u; 85 string_index_to_offset_map_.Put(kStringIndex, string_entry_offset); 86 bss_begin_ = bss_begin; 87 LinkerPatch patches[] = { 88 LinkerPatch::StringBssEntryPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), 89 LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), 90 LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) 91 }; 92 CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), bss_begin_ + string_entry_offset); 93 } 94 95 void MipsRelativePatcherTest::TestStringReference(uint32_t string_offset) { 96 constexpr uint32_t kStringIndex = 1u; 97 string_index_to_offset_map_.Put(kStringIndex, string_offset); 98 LinkerPatch patches[] = { 99 LinkerPatch::RelativeStringPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), 100 LinkerPatch::RelativeStringPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), 101 LinkerPatch::RelativeStringPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) 102 }; 103 CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), string_offset); 104 } 105 106 TEST_F(MipsRelativePatcherTest, StringBssEntry) { 107 TestStringBssEntry(/* bss_begin */ 0x12345678, /* string_entry_offset */ 0x1234); 108 } 109 110 TEST_F(MipsRelativePatcherTest, StringReference) { 111 TestStringReference(/* string_offset*/ 0x87651234); 112 } 113 114 } // namespace linker 115 } // namespace art 116
