| /* |
| * Copyright (C) 2016 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. |
| */ |
| |
| #include "linker/mips/relative_patcher_mips.h" |
| |
| #include "linker/relative_patcher_test.h" |
| |
| namespace art { |
| namespace linker { |
| |
| class MipsRelativePatcherTest : public RelativePatcherTest { |
| public: |
| MipsRelativePatcherTest() : RelativePatcherTest(kMips, "mips32r2") {} |
| |
| protected: |
| static const uint8_t kUnpatchedPcRelativeRawCode[]; |
| static const uint32_t kLiteralOffsetHigh; |
| static const uint32_t kLiteralOffsetLow1; |
| static const uint32_t kLiteralOffsetLow2; |
| static const uint32_t kAnchorOffset; |
| static const ArrayRef<const uint8_t> kUnpatchedPcRelativeCode; |
| |
| uint32_t GetMethodOffset(uint32_t method_idx) { |
| auto result = method_offset_map_.FindMethodOffset(MethodRef(method_idx)); |
| CHECK(result.first); |
| return result.second; |
| } |
| |
| void CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, uint32_t target_offset); |
| void TestStringBssEntry(uint32_t bss_begin, uint32_t string_entry_offset); |
| void TestStringReference(uint32_t string_offset); |
| }; |
| |
| const uint8_t MipsRelativePatcherTest::kUnpatchedPcRelativeRawCode[] = { |
| 0x00, 0x00, 0x10, 0x04, // nal |
| 0x34, 0x12, 0x12, 0x3C, // lui s2, high(diff); placeholder = 0x1234 |
| 0x21, 0x90, 0x5F, 0x02, // addu s2, s2, ra |
| 0x78, 0x56, 0x52, 0x26, // addiu s2, s2, low(diff); placeholder = 0x5678 |
| 0x78, 0x56, 0x52, 0x8E, // lw s2, (low(diff))(s2) ; placeholder = 0x5678 |
| }; |
| const uint32_t MipsRelativePatcherTest::kLiteralOffsetHigh = 4; // At lui. |
| const uint32_t MipsRelativePatcherTest::kLiteralOffsetLow1 = 12; // At addiu. |
| const uint32_t MipsRelativePatcherTest::kLiteralOffsetLow2 = 16; // At lw. |
| const uint32_t MipsRelativePatcherTest::kAnchorOffset = 8; // At addu (where PC+0 points). |
| const ArrayRef<const uint8_t> MipsRelativePatcherTest::kUnpatchedPcRelativeCode( |
| kUnpatchedPcRelativeRawCode); |
| |
| void MipsRelativePatcherTest::CheckPcRelativePatch(const ArrayRef<const LinkerPatch>& patches, |
| uint32_t target_offset) { |
| AddCompiledMethod(MethodRef(1u), kUnpatchedPcRelativeCode, ArrayRef<const LinkerPatch>(patches)); |
| Link(); |
| |
| auto result = method_offset_map_.FindMethodOffset(MethodRef(1u)); |
| ASSERT_TRUE(result.first); |
| |
| uint32_t diff = target_offset - (result.second + kAnchorOffset); |
| diff += (diff & 0x8000) << 1; // Account for sign extension in addiu/lw. |
| |
| const uint8_t expected_code[] = { |
| 0x00, 0x00, 0x10, 0x04, |
| static_cast<uint8_t>(diff >> 16), static_cast<uint8_t>(diff >> 24), 0x12, 0x3C, |
| 0x21, 0x90, 0x5F, 0x02, |
| static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x26, |
| static_cast<uint8_t>(diff), static_cast<uint8_t>(diff >> 8), 0x52, 0x8E, |
| }; |
| EXPECT_TRUE(CheckLinkedMethod(MethodRef(1u), ArrayRef<const uint8_t>(expected_code))); |
| } |
| |
| void MipsRelativePatcherTest::TestStringBssEntry(uint32_t bss_begin, |
| uint32_t string_entry_offset) { |
| constexpr uint32_t kStringIndex = 1u; |
| string_index_to_offset_map_.Put(kStringIndex, string_entry_offset); |
| bss_begin_ = bss_begin; |
| LinkerPatch patches[] = { |
| LinkerPatch::StringBssEntryPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), |
| LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), |
| LinkerPatch::StringBssEntryPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) |
| }; |
| CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), bss_begin_ + string_entry_offset); |
| } |
| |
| void MipsRelativePatcherTest::TestStringReference(uint32_t string_offset) { |
| constexpr uint32_t kStringIndex = 1u; |
| string_index_to_offset_map_.Put(kStringIndex, string_offset); |
| LinkerPatch patches[] = { |
| LinkerPatch::RelativeStringPatch(kLiteralOffsetHigh, nullptr, kAnchorOffset, kStringIndex), |
| LinkerPatch::RelativeStringPatch(kLiteralOffsetLow1, nullptr, kAnchorOffset, kStringIndex), |
| LinkerPatch::RelativeStringPatch(kLiteralOffsetLow2, nullptr, kAnchorOffset, kStringIndex) |
| }; |
| CheckPcRelativePatch(ArrayRef<const LinkerPatch>(patches), string_offset); |
| } |
| |
| TEST_F(MipsRelativePatcherTest, StringBssEntry) { |
| TestStringBssEntry(/* bss_begin */ 0x12345678, /* string_entry_offset */ 0x1234); |
| } |
| |
| TEST_F(MipsRelativePatcherTest, StringReference) { |
| TestStringReference(/* string_offset*/ 0x87651234); |
| } |
| |
| } // namespace linker |
| } // namespace art |