1 //===-- Opcode.cpp ----------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Core/Opcode.h"
11 
12 #include "lldb/Utility/DataBufferHeap.h"
13 #include "lldb/Utility/DataExtractor.h"
14 #include "lldb/Utility/Endian.h"
15 #include "lldb/Utility/Stream.h"
16 #include "lldb/lldb-forward.h" // for DataBufferSP
17 
18 #include <memory> // for make_shared
19 
20 #include <inttypes.h> // for PRIx64
21 
22 using namespace lldb;
23 using namespace lldb_private;
24 
25 int Opcode::Dump(Stream *s, uint32_t min_byte_width) {
26   int bytes_written = 0;
27   switch (m_type) {
28   case Opcode::eTypeInvalid:
29     bytes_written = s->PutCString("<invalid>");
30     break;
31   case Opcode::eType8:
32     bytes_written = s->Printf("0x%2.2x", m_data.inst8);
33     break;
34   case Opcode::eType16:
35     bytes_written = s->Printf("0x%4.4x", m_data.inst16);
36     break;
37   case Opcode::eType16_2:
38   case Opcode::eType32:
39     bytes_written = s->Printf("0x%8.8x", m_data.inst32);
40     break;
41 
42   case Opcode::eType64:
43     bytes_written = s->Printf("0x%16.16" PRIx64, m_data.inst64);
44     break;
45 
46   case Opcode::eTypeBytes:
47     for (uint32_t i = 0; i < m_data.inst.length; ++i) {
48       if (i > 0)
49         bytes_written += s->PutChar(' ');
50       bytes_written += s->Printf("%2.2x", m_data.inst.bytes[i]);
51     }
52     break;
53   }
54 
55   // Add spaces to make sure bytes dispay comes out even in case opcodes
56   // aren't all the same size
57   if (static_cast<uint32_t>(bytes_written) < min_byte_width)
58     bytes_written = s->Printf("%*s", min_byte_width - bytes_written, "");
59   return bytes_written;
60 }
61 
62 lldb::ByteOrder Opcode::GetDataByteOrder() const {
63   if (m_byte_order != eByteOrderInvalid) {
64     return m_byte_order;
65   }
66   switch (m_type) {
67   case Opcode::eTypeInvalid:
68     break;
69   case Opcode::eType8:
70   case Opcode::eType16:
71   case Opcode::eType16_2:
72   case Opcode::eType32:
73   case Opcode::eType64:
74     return endian::InlHostByteOrder();
75   case Opcode::eTypeBytes:
76     break;
77   }
78   return eByteOrderInvalid;
79 }
80 
81 uint32_t Opcode::GetData(DataExtractor &data) const {
82   uint32_t byte_size = GetByteSize();
83   uint8_t swap_buf[8];
84   const void *buf = nullptr;
85 
86   if (byte_size > 0) {
87     if (!GetEndianSwap()) {
88       if (m_type == Opcode::eType16_2) {
89         // 32 bit thumb instruction, we need to sizzle this a bit
90         swap_buf[0] = m_data.inst.bytes[2];
91         swap_buf[1] = m_data.inst.bytes[3];
92         swap_buf[2] = m_data.inst.bytes[0];
93         swap_buf[3] = m_data.inst.bytes[1];
94         buf = swap_buf;
95       } else {
96         buf = GetOpcodeDataBytes();
97       }
98     } else {
99       switch (m_type) {
100       case Opcode::eTypeInvalid:
101         break;
102       case Opcode::eType8:
103         buf = GetOpcodeDataBytes();
104         break;
105       case Opcode::eType16:
106         *(uint16_t *)swap_buf = llvm::ByteSwap_16(m_data.inst16);
107         buf = swap_buf;
108         break;
109       case Opcode::eType16_2:
110         swap_buf[0] = m_data.inst.bytes[1];
111         swap_buf[1] = m_data.inst.bytes[0];
112         swap_buf[2] = m_data.inst.bytes[3];
113         swap_buf[3] = m_data.inst.bytes[2];
114         buf = swap_buf;
115         break;
116       case Opcode::eType32:
117         *(uint32_t *)swap_buf = llvm::ByteSwap_32(m_data.inst32);
118         buf = swap_buf;
119         break;
120       case Opcode::eType64:
121         *(uint32_t *)swap_buf = llvm::ByteSwap_64(m_data.inst64);
122         buf = swap_buf;
123         break;
124       case Opcode::eTypeBytes:
125         buf = GetOpcodeDataBytes();
126         break;
127       }
128     }
129   }
130   if (buf != nullptr) {
131     DataBufferSP buffer_sp;
132 
133     buffer_sp = std::make_shared<DataBufferHeap>(buf, byte_size);
134     data.SetByteOrder(GetDataByteOrder());
135     data.SetData(buffer_sp);
136     return byte_size;
137   }
138   data.Clear();
139   return 0;
140 }
141