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 #include "linker/relative_patcher_test.h" 19 20 namespace art { 21 namespace linker { 22 23 class Mips32r6RelativePatcherTest : public RelativePatcherTest { 24 public: 25 Mips32r6RelativePatcherTest() : RelativePatcherTest(InstructionSet::kMips, "mips32r6") {} 26 27 protected: 28 static const uint8_t kUnpatchedPcRelativeRawCode[]; 29 static const uint32_t kLiteralOffsetHigh; 30 static const uint32_t kLiteralOffsetLow1; 31 static const uint32_t kLiteralOffsetLow2; 32 static const uint32_t kAnchorOffset; 33 static const ArrayRef<const uint8_t> kUnpatchedPcRelativeCode; 34 35 uint32_t GetMethodOffset(uint32_t method_idx) { 36 auto result = method_offset_map_.FindMethodOffset(MethodRef(method_idx)); 37 CHECK(result.first); 38 return result.second; 39 } 40 41 void CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, uint32_t target_offset); 42 void TestStringBssEntry(uint32_t bss_begin, uint32_t string_entry_offset); 43 void TestStringReference(uint32_t string_offset); 44 }; 45 46 const uint8_t Mips32r6RelativePatcherTest::kUnpatchedPcRelativeRawCode[] = { 47 0x34, 0x12, 0x5E, 0xEE, // auipc s2, high(diff); placeholder = 0x1234 48 0x78, 0x56, 0x52, 0x26, // addiu s2, s2, low(diff); placeholder = 0x5678 49 0x78, 0x56, 0x52, 0x8E, // lw s2, (low(diff))(s2) ; placeholder = 0x5678 50 }; 51 const uint32_t Mips32r6RelativePatcherTest::kLiteralOffsetHigh = 0; // At auipc. 52 const uint32_t Mips32r6RelativePatcherTest::kLiteralOffsetLow1 = 4; // At addiu. 53 const uint32_t Mips32r6RelativePatcherTest::kLiteralOffsetLow2 = 8; // At lw. 54 const uint32_t Mips32r6RelativePatcherTest::kAnchorOffset = 0; // At auipc (where PC+0 points). 55 const ArrayRef<const uint8_t> Mips32r6RelativePatcherTest::kUnpatchedPcRelativeCode( 56 kUnpatchedPcRelativeRawCode); 57 58 void Mips32r6RelativePatcherTest::CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, 59 uint32_t target_offset) { 60 AddCompiledMethod(MethodRef(1u), kUnpatchedPcRelativeCode, ArrayRef<const LinkerPatch>(patches)); 61 Link(); 62 63 auto result = method_offset_map_.FindMethodOffset(MethodRef(1u)); 64 ASSERT_TRUE(result.first); 65 66 uint32_t diff = target_offset - (result.second + kAnchorOffset); 67 diff += (diff & 0x8000) << 1; // Account for sign extension in addiu/lw. 68 69 const uint8_t expected_code[] = { 70 static_cast<uint8_t>(diff >> 16), static_cast<uint8_t>(diff >> 24), 0x5E, 0xEE, 71 static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x26, 72 static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x8E, 73 }; 74 EXPECT_TRUE(CheckLinkedMethod(MethodRef(1u), ArrayRef<const uint8_t>(expected_code))); 75 } 76 77 void Mips32r6RelativePatcherTest::TestStringBssEntry(uint32_t bss_begin, 78 uint32_t string_entry_offset) { 79 constexpr uint32_t kStringIndex = 1u; 80 string_index_to_offset_map_.Put(kStringIndex, string_entry_offset); 81 bss_begin_ = bss_begin; 82 LinkerPatch patches[] = { 83 LinkerPatch::StringBssEntryPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), 84 LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), 85 LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) 86 }; 87 CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), bss_begin_ + string_entry_offset); 88 } 89 90 void Mips32r6RelativePatcherTest::TestStringReference(uint32_t string_offset) { 91 constexpr uint32_t kStringIndex = 1u; 92 string_index_to_offset_map_.Put(kStringIndex, string_offset); 93 LinkerPatch patches[] = { 94 LinkerPatch::RelativeStringPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), 95 LinkerPatch::RelativeStringPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), 96 LinkerPatch::RelativeStringPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) 97 }; 98 CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), string_offset); 99 } 100 101 TEST_F(Mips32r6RelativePatcherTest, StringBssEntry) { 102 TestStringBssEntry(/* bss_begin */ 0x12345678, /* string_entry_offset */ 0x1234); 103 } 104 105 TEST_F(Mips32r6RelativePatcherTest, StringReference) { 106 TestStringReference(/* string_offset*/ 0x87651234); 107 } 108 109 } // namespace linker 110 } // namespace art 111
