1 //===-- RegisterContextPOSIXProcessMonitor_arm.cpp ------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===---------------------------------------------------------------------===//
8
9 #include "lldb/Target/Thread.h"
10 #include "lldb/Utility/DataBufferHeap.h"
11 #include "lldb/Utility/RegisterValue.h"
12
13 #include "ProcessFreeBSD.h"
14 #include "ProcessMonitor.h"
15 #include "RegisterContextPOSIXProcessMonitor_arm.h"
16 #include "Plugins/Process/Utility/RegisterContextPOSIX_arm.h"
17 #include "Plugins/Process/Utility/lldb-arm-register-enums.h"
18
19 using namespace lldb_private;
20 using namespace lldb;
21
22 #define REG_CONTEXT_SIZE (GetGPRSize())
23
RegisterContextPOSIXProcessMonitor_arm(lldb_private::Thread & thread,std::unique_ptr<RegisterInfoPOSIX_arm> register_info)24 RegisterContextPOSIXProcessMonitor_arm::RegisterContextPOSIXProcessMonitor_arm(
25 lldb_private::Thread &thread,
26 std::unique_ptr<RegisterInfoPOSIX_arm> register_info)
27 : RegisterContextPOSIX_arm(thread, std::move(register_info)) {}
28
GetMonitor()29 ProcessMonitor &RegisterContextPOSIXProcessMonitor_arm::GetMonitor() {
30 ProcessSP base = CalculateProcess();
31 ProcessFreeBSD *process = static_cast<ProcessFreeBSD *>(base.get());
32 return process->GetMonitor();
33 }
34
ReadGPR()35 bool RegisterContextPOSIXProcessMonitor_arm::ReadGPR() {
36 ProcessMonitor &monitor = GetMonitor();
37 return monitor.ReadGPR(m_thread.GetID(), &m_gpr_arm, GetGPRSize());
38 }
39
ReadFPR()40 bool RegisterContextPOSIXProcessMonitor_arm::ReadFPR() {
41 ProcessMonitor &monitor = GetMonitor();
42 return monitor.ReadFPR(m_thread.GetID(), &m_fpr, sizeof(m_fpr));
43 }
44
WriteGPR()45 bool RegisterContextPOSIXProcessMonitor_arm::WriteGPR() {
46 ProcessMonitor &monitor = GetMonitor();
47 return monitor.WriteGPR(m_thread.GetID(), &m_gpr_arm, GetGPRSize());
48 }
49
WriteFPR()50 bool RegisterContextPOSIXProcessMonitor_arm::WriteFPR() {
51 ProcessMonitor &monitor = GetMonitor();
52 return monitor.WriteFPR(m_thread.GetID(), &m_fpr, sizeof(m_fpr));
53 }
54
ReadRegister(const unsigned reg,RegisterValue & value)55 bool RegisterContextPOSIXProcessMonitor_arm::ReadRegister(
56 const unsigned reg, RegisterValue &value) {
57 ProcessMonitor &monitor = GetMonitor();
58 return monitor.ReadRegisterValue(m_thread.GetID(), GetRegisterOffset(reg),
59 GetRegisterName(reg), GetRegisterSize(reg),
60 value);
61 }
62
WriteRegister(const unsigned reg,const RegisterValue & value)63 bool RegisterContextPOSIXProcessMonitor_arm::WriteRegister(
64 const unsigned reg, const RegisterValue &value) {
65 unsigned reg_to_write = reg;
66 RegisterValue value_to_write = value;
67
68 // Check if this is a subregister of a full register.
69 const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg);
70 if (reg_info->invalidate_regs &&
71 (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM)) {
72 RegisterValue full_value;
73 uint32_t full_reg = reg_info->invalidate_regs[0];
74 const RegisterInfo *full_reg_info = GetRegisterInfoAtIndex(full_reg);
75
76 // Read the full register.
77 if (ReadRegister(full_reg_info, full_value)) {
78 Status error;
79 ByteOrder byte_order = GetByteOrder();
80 uint8_t dst[RegisterValue::kMaxRegisterByteSize];
81
82 // Get the bytes for the full register.
83 const uint32_t dest_size = full_value.GetAsMemoryData(
84 full_reg_info, dst, sizeof(dst), byte_order, error);
85 if (error.Success() && dest_size) {
86 uint8_t src[RegisterValue::kMaxRegisterByteSize];
87
88 // Get the bytes for the source data.
89 const uint32_t src_size = value.GetAsMemoryData(
90 reg_info, src, sizeof(src), byte_order, error);
91 if (error.Success() && src_size && (src_size < dest_size)) {
92 // Copy the src bytes to the destination.
93 memcpy(dst + (reg_info->byte_offset & 0x1), src, src_size);
94 // Set this full register as the value to write.
95 value_to_write.SetBytes(dst, full_value.GetByteSize(), byte_order);
96 value_to_write.SetType(full_reg_info);
97 reg_to_write = full_reg;
98 }
99 }
100 }
101 }
102
103 ProcessMonitor &monitor = GetMonitor();
104 return monitor.WriteRegisterValue(
105 m_thread.GetID(), GetRegisterOffset(reg_to_write),
106 GetRegisterName(reg_to_write), value_to_write);
107 }
108
ReadRegister(const RegisterInfo * reg_info,RegisterValue & value)109 bool RegisterContextPOSIXProcessMonitor_arm::ReadRegister(
110 const RegisterInfo *reg_info, RegisterValue &value) {
111 if (!reg_info)
112 return false;
113
114 const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
115
116 if (IsFPR(reg)) {
117 if (!ReadFPR())
118 return false;
119 } else {
120 return ReadRegister(reg, value);
121 }
122
123 // Get pointer to m_fpr variable and set the data from it.
124 assert(reg_info->byte_offset < sizeof m_fpr);
125 uint8_t *src = (uint8_t *)&m_fpr + reg_info->byte_offset;
126 switch (reg_info->byte_size) {
127 case 2:
128 value.SetUInt16(*(uint16_t *)src);
129 return true;
130 case 4:
131 value.SetUInt32(*(uint32_t *)src);
132 return true;
133 case 8:
134 value.SetUInt64(*(uint64_t *)src);
135 return true;
136 default:
137 assert(false && "Unhandled data size.");
138 return false;
139 }
140 }
141
WriteRegister(const RegisterInfo * reg_info,const RegisterValue & value)142 bool RegisterContextPOSIXProcessMonitor_arm::WriteRegister(
143 const RegisterInfo *reg_info, const RegisterValue &value) {
144 const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
145
146 if (IsGPR(reg)) {
147 return WriteRegister(reg, value);
148 } else if (IsFPR(reg)) {
149 return WriteFPR();
150 }
151
152 return false;
153 }
154
ReadAllRegisterValues(DataBufferSP & data_sp)155 bool RegisterContextPOSIXProcessMonitor_arm::ReadAllRegisterValues(
156 DataBufferSP &data_sp) {
157 bool success = false;
158 data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0));
159 if (ReadGPR() && ReadFPR()) {
160 uint8_t *dst = data_sp->GetBytes();
161 success = dst != 0;
162
163 if (success) {
164 ::memcpy(dst, &m_gpr_arm, GetGPRSize());
165 dst += GetGPRSize();
166 ::memcpy(dst, &m_fpr, sizeof(m_fpr));
167 }
168 }
169 return success;
170 }
171
WriteAllRegisterValues(const DataBufferSP & data_sp)172 bool RegisterContextPOSIXProcessMonitor_arm::WriteAllRegisterValues(
173 const DataBufferSP &data_sp) {
174 bool success = false;
175 if (data_sp && data_sp->GetByteSize() == REG_CONTEXT_SIZE) {
176 uint8_t *src = data_sp->GetBytes();
177 if (src) {
178 ::memcpy(&m_gpr_arm, src, GetGPRSize());
179
180 if (WriteGPR()) {
181 src += GetGPRSize();
182 ::memcpy(&m_fpr, src, sizeof(m_fpr));
183
184 success = WriteFPR();
185 }
186 }
187 }
188 return success;
189 }
190
SetHardwareWatchpoint(addr_t addr,size_t size,bool read,bool write)191 uint32_t RegisterContextPOSIXProcessMonitor_arm::SetHardwareWatchpoint(
192 addr_t addr, size_t size, bool read, bool write) {
193 const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints();
194 uint32_t hw_index;
195
196 for (hw_index = 0; hw_index < num_hw_watchpoints; ++hw_index) {
197 if (IsWatchpointVacant(hw_index))
198 return SetHardwareWatchpointWithIndex(addr, size, read, write, hw_index);
199 }
200
201 return LLDB_INVALID_INDEX32;
202 }
203
ClearHardwareWatchpoint(uint32_t hw_index)204 bool RegisterContextPOSIXProcessMonitor_arm::ClearHardwareWatchpoint(
205 uint32_t hw_index) {
206 return false;
207 }
208
HardwareSingleStep(bool enable)209 bool RegisterContextPOSIXProcessMonitor_arm::HardwareSingleStep(bool enable) {
210 return false;
211 }
212
UpdateAfterBreakpoint()213 bool RegisterContextPOSIXProcessMonitor_arm::UpdateAfterBreakpoint() {
214 lldb::addr_t pc;
215
216 if ((pc = GetPC()) == LLDB_INVALID_ADDRESS)
217 return false;
218
219 return true;
220 }
221
GetRegisterIndexFromOffset(unsigned offset)222 unsigned RegisterContextPOSIXProcessMonitor_arm::GetRegisterIndexFromOffset(
223 unsigned offset) {
224 unsigned reg;
225 for (reg = 0; reg < k_num_registers_arm; reg++) {
226 if (GetRegisterInfo()[reg].byte_offset == offset)
227 break;
228 }
229 assert(reg < k_num_registers_arm && "Invalid register offset.");
230 return reg;
231 }
232
IsWatchpointHit(uint32_t hw_index)233 bool RegisterContextPOSIXProcessMonitor_arm::IsWatchpointHit(
234 uint32_t hw_index) {
235 return false;
236 }
237
ClearWatchpointHits()238 bool RegisterContextPOSIXProcessMonitor_arm::ClearWatchpointHits() {
239 return false;
240 }
241
GetWatchpointAddress(uint32_t hw_index)242 addr_t RegisterContextPOSIXProcessMonitor_arm::GetWatchpointAddress(
243 uint32_t hw_index) {
244 return LLDB_INVALID_ADDRESS;
245 }
246
IsWatchpointVacant(uint32_t hw_index)247 bool RegisterContextPOSIXProcessMonitor_arm::IsWatchpointVacant(
248 uint32_t hw_index) {
249 return false;
250 }
251
SetHardwareWatchpointWithIndex(addr_t addr,size_t size,bool read,bool write,uint32_t hw_index)252 bool RegisterContextPOSIXProcessMonitor_arm::SetHardwareWatchpointWithIndex(
253 addr_t addr, size_t size, bool read, bool write, uint32_t hw_index) {
254 return false;
255 }
256
257 uint32_t
NumSupportedHardwareWatchpoints()258 RegisterContextPOSIXProcessMonitor_arm::NumSupportedHardwareWatchpoints() {
259 return 0;
260 }
261