1 //===-- RegisterContextPOSIXProcessMonitor_arm64.cpp -----------*- C++ -*-===//
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 "Plugins/Process/Utility/RegisterContextPOSIX_arm64.h"
14 #include "ProcessFreeBSD.h"
15 #include "ProcessMonitor.h"
16 #include "RegisterContextPOSIXProcessMonitor_arm64.h"
17
18 #define REG_CONTEXT_SIZE (GetGPRSize())
19
20 using namespace lldb;
21 using namespace lldb_private;
22
23 RegisterContextPOSIXProcessMonitor_arm64::
RegisterContextPOSIXProcessMonitor_arm64(lldb_private::Thread & thread,uint32_t concrete_frame_idx,lldb_private::RegisterInfoInterface * register_info)24 RegisterContextPOSIXProcessMonitor_arm64(
25 lldb_private::Thread &thread, uint32_t concrete_frame_idx,
26 lldb_private::RegisterInfoInterface *register_info)
27 : RegisterContextPOSIX_arm64(thread, concrete_frame_idx, register_info) {}
28
GetMonitor()29 ProcessMonitor &RegisterContextPOSIXProcessMonitor_arm64::GetMonitor() {
30 lldb::ProcessSP base = CalculateProcess();
31 ProcessFreeBSD *process = static_cast<ProcessFreeBSD *>(base.get());
32 return process->GetMonitor();
33 }
34
ReadGPR()35 bool RegisterContextPOSIXProcessMonitor_arm64::ReadGPR() {
36 ProcessMonitor &monitor = GetMonitor();
37 return monitor.ReadGPR(m_thread.GetID(), &m_gpr_arm64, GetGPRSize());
38 }
39
ReadFPR()40 bool RegisterContextPOSIXProcessMonitor_arm64::ReadFPR() {
41 ProcessMonitor &monitor = GetMonitor();
42 return monitor.ReadFPR(m_thread.GetID(), &m_fpr, sizeof m_fpr);
43 }
44
WriteGPR()45 bool RegisterContextPOSIXProcessMonitor_arm64::WriteGPR() {
46 ProcessMonitor &monitor = GetMonitor();
47 return monitor.WriteGPR(m_thread.GetID(), &m_gpr_arm64, GetGPRSize());
48 }
49
WriteFPR()50 bool RegisterContextPOSIXProcessMonitor_arm64::WriteFPR() {
51 ProcessMonitor &monitor = GetMonitor();
52 return monitor.WriteFPR(m_thread.GetID(), &m_fpr, sizeof m_fpr);
53 }
54
ReadRegister(const unsigned reg,lldb_private::RegisterValue & value)55 bool RegisterContextPOSIXProcessMonitor_arm64::ReadRegister(
56 const unsigned reg, lldb_private::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 lldb_private::RegisterValue & value)63 bool RegisterContextPOSIXProcessMonitor_arm64::WriteRegister(
64 const unsigned reg, const lldb_private::RegisterValue &value) {
65 unsigned reg_to_write = reg;
66 lldb_private::RegisterValue value_to_write = value;
67
68 // Check if this is a subregister of a full register.
69 const lldb_private::RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg);
70 if (reg_info->invalidate_regs &&
71 (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM)) {
72 lldb_private::RegisterValue full_value;
73 uint32_t full_reg = reg_info->invalidate_regs[0];
74 const lldb_private::RegisterInfo *full_reg_info =
75 GetRegisterInfoAtIndex(full_reg);
76
77 // Read the full register.
78 if (ReadRegister(full_reg_info, full_value)) {
79 lldb_private::Status error;
80 lldb::ByteOrder byte_order = GetByteOrder();
81 uint8_t dst[lldb_private::RegisterValue::kMaxRegisterByteSize];
82
83 // Get the bytes for the full register.
84 const uint32_t dest_size = full_value.GetAsMemoryData(
85 full_reg_info, dst, sizeof(dst), byte_order, error);
86 if (error.Success() && dest_size) {
87 uint8_t src[lldb_private::RegisterValue::kMaxRegisterByteSize];
88
89 // Get the bytes for the source data.
90 const uint32_t src_size = value.GetAsMemoryData(
91 reg_info, src, sizeof(src), byte_order, error);
92 if (error.Success() && src_size && (src_size < dest_size)) {
93 // Copy the src bytes to the destination.
94 ::memcpy(dst + (reg_info->byte_offset & 0x1), src, src_size);
95 // Set this full register as the value to write.
96 value_to_write.SetBytes(dst, full_value.GetByteSize(), byte_order);
97 value_to_write.SetType(full_reg_info);
98 reg_to_write = full_reg;
99 }
100 }
101 }
102 }
103
104 ProcessMonitor &monitor = GetMonitor();
105 return monitor.WriteRegisterValue(
106 m_thread.GetID(), GetRegisterOffset(reg_to_write),
107 GetRegisterName(reg_to_write), value_to_write);
108 }
109
ReadRegister(const lldb_private::RegisterInfo * reg_info,lldb_private::RegisterValue & value)110 bool RegisterContextPOSIXProcessMonitor_arm64::ReadRegister(
111 const lldb_private::RegisterInfo *reg_info,
112 lldb_private::RegisterValue &value) {
113 if (!reg_info)
114 return false;
115
116 const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
117
118 if (IsFPR(reg)) {
119 if (!ReadFPR())
120 return false;
121 } else {
122 uint32_t full_reg = reg;
123 bool is_subreg = reg_info->invalidate_regs &&
124 (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM);
125
126 if (is_subreg) {
127 // Read the full aligned 64-bit register.
128 full_reg = reg_info->invalidate_regs[0];
129 }
130 return ReadRegister(full_reg, value);
131 }
132
133 // Get pointer to m_fpr variable and set the data from it.
134 assert(reg_info->byte_offset < sizeof m_fpr);
135 uint8_t *src = (uint8_t *)&m_fpr + reg_info->byte_offset;
136 switch (reg_info->byte_size) {
137 case 2:
138 value.SetUInt16(*(uint16_t *)src);
139 return true;
140 case 4:
141 value.SetUInt32(*(uint32_t *)src);
142 return true;
143 case 8:
144 value.SetUInt64(*(uint64_t *)src);
145 return true;
146 default:
147 assert(false && "Unhandled data size.");
148 return false;
149 }
150 }
151
WriteRegister(const lldb_private::RegisterInfo * reg_info,const lldb_private::RegisterValue & value)152 bool RegisterContextPOSIXProcessMonitor_arm64::WriteRegister(
153 const lldb_private::RegisterInfo *reg_info,
154 const lldb_private::RegisterValue &value) {
155 const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
156
157 if (IsGPR(reg))
158 return WriteRegister(reg, value);
159
160 return false;
161 }
162
ReadAllRegisterValues(lldb::DataBufferSP & data_sp)163 bool RegisterContextPOSIXProcessMonitor_arm64::ReadAllRegisterValues(
164 lldb::DataBufferSP &data_sp) {
165 bool success = false;
166 data_sp.reset(new lldb_private::DataBufferHeap(REG_CONTEXT_SIZE, 0));
167 if (ReadGPR() && ReadFPR()) {
168 uint8_t *dst = data_sp->GetBytes();
169 success = dst != 0;
170
171 if (success) {
172 ::memcpy(dst, &m_gpr_arm64, GetGPRSize());
173 dst += GetGPRSize();
174 ::memcpy(dst, &m_fpr, sizeof m_fpr);
175 }
176 }
177 return success;
178 }
179
WriteAllRegisterValues(const lldb::DataBufferSP & data_sp)180 bool RegisterContextPOSIXProcessMonitor_arm64::WriteAllRegisterValues(
181 const lldb::DataBufferSP &data_sp) {
182 bool success = false;
183 if (data_sp && data_sp->GetByteSize() == REG_CONTEXT_SIZE) {
184 uint8_t *src = data_sp->GetBytes();
185 if (src) {
186 ::memcpy(&m_gpr_arm64, src, GetGPRSize());
187 if (WriteGPR()) {
188 src += GetGPRSize();
189 ::memcpy(&m_fpr, src, sizeof m_fpr);
190 success = WriteFPR();
191 }
192 }
193 }
194 return success;
195 }
196
SetHardwareWatchpoint(lldb::addr_t addr,size_t size,bool read,bool write)197 uint32_t RegisterContextPOSIXProcessMonitor_arm64::SetHardwareWatchpoint(
198 lldb::addr_t addr, size_t size, bool read, bool write) {
199 const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints();
200 uint32_t hw_index;
201
202 for (hw_index = 0; hw_index < num_hw_watchpoints; ++hw_index) {
203 if (IsWatchpointVacant(hw_index))
204 return SetHardwareWatchpointWithIndex(addr, size, read, write, hw_index);
205 }
206
207 return LLDB_INVALID_INDEX32;
208 }
209
ClearHardwareWatchpoint(uint32_t hw_index)210 bool RegisterContextPOSIXProcessMonitor_arm64::ClearHardwareWatchpoint(
211 uint32_t hw_index) {
212 return false;
213 }
214
HardwareSingleStep(bool enable)215 bool RegisterContextPOSIXProcessMonitor_arm64::HardwareSingleStep(bool enable) {
216 return false;
217 }
218
UpdateAfterBreakpoint()219 bool RegisterContextPOSIXProcessMonitor_arm64::UpdateAfterBreakpoint() {
220 if (GetPC() == LLDB_INVALID_ADDRESS)
221 return false;
222
223 return true;
224 }
225
GetRegisterIndexFromOffset(unsigned offset)226 unsigned RegisterContextPOSIXProcessMonitor_arm64::GetRegisterIndexFromOffset(
227 unsigned offset) {
228 unsigned reg;
229 for (reg = 0; reg < k_num_registers_arm64; reg++) {
230 if (GetRegisterInfo()[reg].byte_offset == offset)
231 break;
232 }
233 assert(reg < k_num_registers_arm64 && "Invalid register offset.");
234 return reg;
235 }
236
IsWatchpointHit(uint32_t hw_index)237 bool RegisterContextPOSIXProcessMonitor_arm64::IsWatchpointHit(
238 uint32_t hw_index) {
239 return false;
240 }
241
ClearWatchpointHits()242 bool RegisterContextPOSIXProcessMonitor_arm64::ClearWatchpointHits() {
243 return false;
244 }
245
GetWatchpointAddress(uint32_t hw_index)246 lldb::addr_t RegisterContextPOSIXProcessMonitor_arm64::GetWatchpointAddress(
247 uint32_t hw_index) {
248 return LLDB_INVALID_ADDRESS;
249 }
250
IsWatchpointVacant(uint32_t hw_index)251 bool RegisterContextPOSIXProcessMonitor_arm64::IsWatchpointVacant(
252 uint32_t hw_index) {
253 return false;
254 }
255
SetHardwareWatchpointWithIndex(lldb::addr_t addr,size_t size,bool read,bool write,uint32_t hw_index)256 bool RegisterContextPOSIXProcessMonitor_arm64::SetHardwareWatchpointWithIndex(
257 lldb::addr_t addr, size_t size, bool read, bool write, uint32_t hw_index) {
258 return false;
259 }
260
261 uint32_t
NumSupportedHardwareWatchpoints()262 RegisterContextPOSIXProcessMonitor_arm64::NumSupportedHardwareWatchpoints() {
263 return 0;
264 }
265