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:
Mips32r6RelativePatcherTest()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
GetMethodOffset(uint32_t method_idx)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
CheckPcRelativePatch(const ArrayRef<const LinkerPatch> & patches,uint32_t target_offset)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
TestDexCacheReference(uint32_t dex_cache_arrays_begin,uint32_t element_offset)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
TestStringReference(uint32_t string_offset)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
TEST_F(Mips32r6RelativePatcherTest,DexCacheReference)91 TEST_F(Mips32r6RelativePatcherTest, DexCacheReference) {
92 TestDexCacheReference(/* dex_cache_arrays_begin */ 0x12345678, /* element_offset */ 0x1234);
93 }
94
TEST_F(Mips32r6RelativePatcherTest,StringReference)95 TEST_F(Mips32r6RelativePatcherTest, StringReference) {
96 TestStringReference(/* string_offset*/ 0x87651234);
97 }
98
99 } // namespace linker
100 } // namespace art
101