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1 //===-- DNBArchImpl.h -------------------------------------------*- 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 //  Created by Greg Clayton on 6/25/07.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_ARM_DNBARCHIMPL_H
14 #define LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_ARM_DNBARCHIMPL_H
15 
16 #if defined(__arm__) || defined(__arm64__) || defined(__aarch64__)
17 
18 #include "DNBArch.h"
19 
20 #include <map>
21 
22 class MachThread;
23 
24 class DNBArchMachARM : public DNBArchProtocol {
25 public:
26   enum { kMaxNumThumbITBreakpoints = 4 };
27 
DNBArchMachARM(MachThread * thread)28   DNBArchMachARM(MachThread *thread)
29       : m_thread(thread), m_state(), m_disabled_watchpoints(),
30         m_hw_single_chained_step_addr(INVALID_NUB_ADDRESS),
31         m_last_decode_pc(INVALID_NUB_ADDRESS), m_watchpoint_hw_index(-1),
32         m_watchpoint_did_occur(false),
33         m_watchpoint_resume_single_step_enabled(false),
34         m_saved_register_states() {
35     m_disabled_watchpoints.resize(16);
36     memset(&m_dbg_save, 0, sizeof(m_dbg_save));
37 #if defined(USE_ARM_DISASSEMBLER_FRAMEWORK)
38     ThumbStaticsInit(&m_last_decode_thumb);
39 #endif
40   }
41 
~DNBArchMachARM()42   virtual ~DNBArchMachARM() {}
43 
44   static void Initialize();
45   static const DNBRegisterSetInfo *GetRegisterSetInfo(nub_size_t *num_reg_sets);
46 
47   virtual bool GetRegisterValue(uint32_t set, uint32_t reg,
48                                 DNBRegisterValue *value);
49   virtual bool SetRegisterValue(uint32_t set, uint32_t reg,
50                                 const DNBRegisterValue *value);
51   virtual nub_size_t GetRegisterContext(void *buf, nub_size_t buf_len);
52   virtual nub_size_t SetRegisterContext(const void *buf, nub_size_t buf_len);
53   virtual uint32_t SaveRegisterState();
54   virtual bool RestoreRegisterState(uint32_t save_id);
55 
56   virtual kern_return_t GetRegisterState(int set, bool force);
57   virtual kern_return_t SetRegisterState(int set);
58   virtual bool RegisterSetStateIsValid(int set) const;
59 
60   virtual uint64_t GetPC(uint64_t failValue); // Get program counter
61   virtual kern_return_t SetPC(uint64_t value);
62   virtual uint64_t GetSP(uint64_t failValue); // Get stack pointer
63   virtual void ThreadWillResume();
64   virtual bool ThreadDidStop();
65   virtual bool NotifyException(MachException::Data &exc);
66 
67   static DNBArchProtocol *Create(MachThread *thread);
68   static const uint8_t *SoftwareBreakpointOpcode(nub_size_t byte_size);
69   static uint32_t GetCPUType();
70 
71   virtual uint32_t NumSupportedHardwareBreakpoints();
72   virtual uint32_t NumSupportedHardwareWatchpoints();
73   virtual uint32_t EnableHardwareBreakpoint(nub_addr_t addr, nub_size_t size,
74                                             bool also_set_on_task);
75   virtual bool DisableHardwareBreakpoint(uint32_t hw_break_index,
76                                          bool also_set_on_task);
77 
78   virtual uint32_t EnableHardwareWatchpoint(nub_addr_t addr, nub_size_t size,
79                                             bool read, bool write,
80                                             bool also_set_on_task);
81   virtual bool DisableHardwareWatchpoint(uint32_t hw_break_index,
82                                          bool also_set_on_task);
83   virtual bool DisableHardwareWatchpoint_helper(uint32_t hw_break_index,
84                                                 bool also_set_on_task);
85   virtual bool ReenableHardwareWatchpoint(uint32_t hw_break_index);
86   virtual bool ReenableHardwareWatchpoint_helper(uint32_t hw_break_index);
87 
88   virtual bool StepNotComplete();
89   virtual uint32_t GetHardwareWatchpointHit(nub_addr_t &addr);
90 
91 #if defined(ARM_DEBUG_STATE32) && (defined(__arm64__) || defined(__aarch64__))
92   typedef arm_debug_state32_t DBG;
93 #else
94   typedef arm_debug_state_t DBG;
95 #endif
96 
97 protected:
98   kern_return_t EnableHardwareSingleStep(bool enable);
99   kern_return_t SetSingleStepSoftwareBreakpoints();
100 
101   bool ConditionPassed(uint8_t condition, uint32_t cpsr);
102 #if defined(USE_ARM_DISASSEMBLER_FRAMEWORK)
103   bool ComputeNextPC(nub_addr_t currentPC,
104                      arm_decoded_instruction_t decodedInstruction,
105                      bool currentPCIsThumb, nub_addr_t *targetPC);
106   arm_error_t DecodeInstructionUsingDisassembler(
107       nub_addr_t curr_pc, uint32_t curr_cpsr,
108       arm_decoded_instruction_t *decodedInstruction,
109       thumb_static_data_t *thumbStaticData, nub_addr_t *next_pc);
110   void DecodeITBlockInstructions(nub_addr_t curr_pc);
111 #endif
112   void EvaluateNextInstructionForSoftwareBreakpointSetup(nub_addr_t currentPC,
113                                                          uint32_t cpsr,
114                                                          bool currentPCIsThumb,
115                                                          nub_addr_t *nextPC,
116                                                          bool *nextPCIsThumb);
117 
118   enum RegisterSet {
119     e_regSetALL = REGISTER_SET_ALL,
120     e_regSetGPR, // ARM_THREAD_STATE
121     e_regSetVFP, // ARM_VFP_STATE (ARM_NEON_STATE if defined __arm64__)
122     e_regSetEXC, // ARM_EXCEPTION_STATE
123     e_regSetDBG, // ARM_DEBUG_STATE (ARM_DEBUG_STATE32 if defined __arm64__)
124     kNumRegisterSets
125   };
126 
127   enum { Read = 0, Write = 1, kNumErrors = 2 };
128 
129   typedef arm_thread_state_t GPR;
130 #if defined(__arm64__) || defined(__aarch64__)
131   typedef arm_neon_state_t FPU;
132 #else
133   typedef arm_vfp_state_t FPU;
134 #endif
135   typedef arm_exception_state_t EXC;
136 
137   static const DNBRegisterInfo g_gpr_registers[];
138   static const DNBRegisterInfo g_vfp_registers[];
139   static const DNBRegisterInfo g_exc_registers[];
140   static const DNBRegisterSetInfo g_reg_sets[];
141 
142   static const size_t k_num_gpr_registers;
143   static const size_t k_num_vfp_registers;
144   static const size_t k_num_exc_registers;
145   static const size_t k_num_all_registers;
146   static const size_t k_num_register_sets;
147 
148   struct Context {
149     GPR gpr;
150     FPU vfp;
151     EXC exc;
152   };
153 
154   struct State {
155     Context context;
156     DBG dbg;
157     kern_return_t gpr_errs[2]; // Read/Write errors
158     kern_return_t vfp_errs[2]; // Read/Write errors
159     kern_return_t exc_errs[2]; // Read/Write errors
160     kern_return_t dbg_errs[2]; // Read/Write errors
StateState161     State() {
162       uint32_t i;
163       for (i = 0; i < kNumErrors; i++) {
164         gpr_errs[i] = -1;
165         vfp_errs[i] = -1;
166         exc_errs[i] = -1;
167         dbg_errs[i] = -1;
168       }
169     }
InvalidateRegisterSetStateState170     void InvalidateRegisterSetState(int set) { SetError(set, Read, -1); }
GetErrorState171     kern_return_t GetError(int set, uint32_t err_idx) const {
172       if (err_idx < kNumErrors) {
173         switch (set) {
174         // When getting all errors, just OR all values together to see if
175         // we got any kind of error.
176         case e_regSetALL:
177           return gpr_errs[err_idx] | vfp_errs[err_idx] | exc_errs[err_idx] |
178                  dbg_errs[err_idx];
179         case e_regSetGPR:
180           return gpr_errs[err_idx];
181         case e_regSetVFP:
182           return vfp_errs[err_idx];
183         case e_regSetEXC:
184           return exc_errs[err_idx];
185         case e_regSetDBG:
186           return dbg_errs[err_idx];
187         default:
188           break;
189         }
190       }
191       return -1;
192     }
SetErrorState193     bool SetError(int set, uint32_t err_idx, kern_return_t err) {
194       if (err_idx < kNumErrors) {
195         switch (set) {
196         case e_regSetALL:
197           gpr_errs[err_idx] = err;
198           vfp_errs[err_idx] = err;
199           dbg_errs[err_idx] = err;
200           exc_errs[err_idx] = err;
201           return true;
202 
203         case e_regSetGPR:
204           gpr_errs[err_idx] = err;
205           return true;
206 
207         case e_regSetVFP:
208           vfp_errs[err_idx] = err;
209           return true;
210 
211         case e_regSetEXC:
212           exc_errs[err_idx] = err;
213           return true;
214 
215         case e_regSetDBG:
216           dbg_errs[err_idx] = err;
217           return true;
218         default:
219           break;
220         }
221       }
222       return false;
223     }
RegsAreValidState224     bool RegsAreValid(int set) const {
225       return GetError(set, Read) == KERN_SUCCESS;
226     }
227   };
228 
229   kern_return_t GetGPRState(bool force);
230   kern_return_t GetVFPState(bool force);
231   kern_return_t GetEXCState(bool force);
232   kern_return_t GetDBGState(bool force);
233 
234   kern_return_t SetGPRState();
235   kern_return_t SetVFPState();
236   kern_return_t SetEXCState();
237   kern_return_t SetDBGState(bool also_set_on_task);
238 
239   bool IsWatchpointEnabled(const DBG &debug_state, uint32_t hw_index);
240   nub_addr_t GetWatchpointAddressByIndex(uint32_t hw_index);
241   nub_addr_t GetWatchAddress(const DBG &debug_state, uint32_t hw_index);
242 
243   class disabled_watchpoint {
244   public:
disabled_watchpoint()245     disabled_watchpoint() {
246       addr = 0;
247       control = 0;
248     }
249     nub_addr_t addr;
250     uint32_t control;
251   };
252 
253 protected:
254   MachThread *m_thread;
255   State m_state;
256   DBG m_dbg_save;
257 
258   // armv8 doesn't keep the disabled watchpoint values in the debug register
259   // context like armv7;
260   // we need to save them aside when we disable them temporarily.
261   std::vector<disabled_watchpoint> m_disabled_watchpoints;
262 
263   nub_addr_t m_hw_single_chained_step_addr;
264   nub_addr_t m_last_decode_pc;
265 
266   // The following member variables should be updated atomically.
267   int32_t m_watchpoint_hw_index;
268   bool m_watchpoint_did_occur;
269   bool m_watchpoint_resume_single_step_enabled;
270 
271   typedef std::map<uint32_t, Context> SaveRegisterStates;
272   SaveRegisterStates m_saved_register_states;
273 };
274 
275 #endif // #if defined (__arm__)
276 #endif // LLDB_TOOLS_DEBUGSERVER_SOURCE_MACOSX_ARM_DNBARCHIMPL_H
277