1 /*
2 * Copyright (C) 2014 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 "berberis/assembler/machine_code.h"
18
19 #include <string>
20
21 #include "berberis/base/bit_util.h"
22 #include "berberis/base/logging.h"
23
24 namespace berberis {
25
AddrOf(uint32_t offset)26 uint8_t* MachineCode::AddrOf(uint32_t offset) {
27 CHECK_LT(offset, code_.size());
28 return &code_[offset];
29 }
30
AddrOf(uint32_t offset) const31 const uint8_t* MachineCode::AddrOf(uint32_t offset) const {
32 CHECK_LT(offset, code_.size());
33 return &code_[offset];
34 }
35
Grow(uint32_t count)36 uint32_t MachineCode::Grow(uint32_t count) {
37 size_t old_size = code_.size();
38 code_.resize(old_size + count);
39 return old_size;
40 }
41
print_halfbyte(uint8_t b)42 inline char print_halfbyte(uint8_t b) {
43 return b < 0xa ? b + '0' : (b - 0xa) + 'a';
44 }
45
print_byte(uint8_t b)46 inline std::string print_byte(uint8_t b) {
47 std::string byte_str = "";
48 byte_str += print_halfbyte(b >> 4);
49 byte_str += print_halfbyte(b & 0xf);
50 return byte_str;
51 }
52
AsString(std::string * result,InstructionSize insn_size) const53 void MachineCode::AsString(std::string* result, InstructionSize insn_size) const {
54 if (insn_size == InstructionSize::OneByte) {
55 for (uint8_t insn : code_) {
56 *result += print_byte(insn);
57 *result += ' ';
58 }
59 } else {
60 for (uint32_t i = 0; i + 3 < code_.size(); i += 4) {
61 *result += print_byte(code_[i + 3]);
62 *result += print_byte(code_[i + 2]);
63 *result += print_byte(code_[i + 1]);
64 *result += print_byte(code_[i]);
65 *result += ' ';
66 }
67 }
68 }
69
PerformRelocations(const uint8_t * code,RecoveryMap * recovery_map)70 void MachineCode::PerformRelocations(const uint8_t* code, RecoveryMap* recovery_map) {
71 for (const auto& rel : relocations_) {
72 switch (rel.type) {
73 case RelocationType::RelocAbsToDisp32: {
74 intptr_t start = reinterpret_cast<intptr_t>(code);
75 intptr_t pc = start + rel.pc;
76 intptr_t disp = rel.data - pc;
77 CHECK(IsInRange<int32_t>(disp));
78 *AddrAs<int32_t>(rel.dst) = disp;
79 break;
80 }
81 case RelocationType::RelocRecoveryPoint: {
82 uintptr_t start = reinterpret_cast<uintptr_t>(code);
83 uintptr_t fault_addr = start + rel.pc;
84 uintptr_t recovery_addr = start + rel.data;
85 (*recovery_map)[fault_addr] = recovery_addr;
86 break;
87 }
88 }
89 }
90 }
91
DumpCode(InstructionSize insn_size) const92 void MachineCode::DumpCode(InstructionSize insn_size) const {
93 std::string code_str;
94 AsString(&code_str, insn_size);
95 ALOGE("%s\n", code_str.c_str());
96 }
97
98 } // namespace berberis
99