1 //===-- DNBArchImpl.h -------------------------------------------*- 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 // Created by Greg Clayton on 6/25/07. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef __DebugNubArchMachARM_h__ 15 #define __DebugNubArchMachARM_h__ 16 17 #if defined (__arm__) 18 19 #include "DNBArch.h" 20 21 class MachThread; 22 23 class DNBArchMachARM : public DNBArchProtocol 24 { 25 public: 26 enum { kMaxNumThumbITBreakpoints = 4 }; 27 28 DNBArchMachARM(MachThread *thread) : 29 m_thread(thread), 30 m_state(), 31 m_hw_single_chained_step_addr(INVALID_NUB_ADDRESS), 32 m_last_decode_pc(INVALID_NUB_ADDRESS), 33 m_watchpoint_hw_index(-1), 34 m_watchpoint_did_occur(false), 35 m_watchpoint_resume_single_step_enabled(false) 36 { 37 memset(&m_dbg_save, 0, sizeof(m_dbg_save)); 38 #if defined (USE_ARM_DISASSEMBLER_FRAMEWORK) 39 ThumbStaticsInit(&m_last_decode_thumb); 40 #endif 41 } 42 43 virtual ~DNBArchMachARM() 44 { 45 } 46 47 static void Initialize(); 48 static const DNBRegisterSetInfo * 49 GetRegisterSetInfo(nub_size_t *num_reg_sets); 50 51 virtual bool GetRegisterValue(int set, int reg, DNBRegisterValue *value); 52 virtual bool SetRegisterValue(int set, int reg, const DNBRegisterValue *value); 53 virtual nub_size_t GetRegisterContext (void *buf, nub_size_t buf_len); 54 virtual nub_size_t SetRegisterContext (const void *buf, nub_size_t buf_len); 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 * const 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 virtual uint32_t EnableHardwareWatchpoint (nub_addr_t addr, nub_size_t size, bool read, bool write, bool also_set_on_task); 75 virtual bool DisableHardwareBreakpoint (uint32_t hw_break_index); 76 virtual bool DisableHardwareWatchpoint (uint32_t hw_break_index, bool also_set_on_task); 77 virtual bool EnableHardwareWatchpoint0 (uint32_t hw_break_index, bool Delegate, bool also_set_on_task); 78 virtual bool DisableHardwareWatchpoint0 (uint32_t hw_break_index, bool Delegate, bool also_set_on_task); 79 virtual bool StepNotComplete (); 80 virtual uint32_t GetHardwareWatchpointHit(nub_addr_t &addr); 81 82 typedef arm_debug_state_t DBG; 83 84 protected: 85 86 87 kern_return_t EnableHardwareSingleStep (bool enable); 88 kern_return_t SetSingleStepSoftwareBreakpoints (); 89 90 bool ConditionPassed(uint8_t condition, uint32_t cpsr); 91 #if defined (USE_ARM_DISASSEMBLER_FRAMEWORK) 92 bool ComputeNextPC(nub_addr_t currentPC, arm_decoded_instruction_t decodedInstruction, bool currentPCIsThumb, nub_addr_t *targetPC); 93 arm_error_t DecodeInstructionUsingDisassembler(nub_addr_t curr_pc, uint32_t curr_cpsr, arm_decoded_instruction_t *decodedInstruction, thumb_static_data_t *thumbStaticData, nub_addr_t *next_pc); 94 void DecodeITBlockInstructions(nub_addr_t curr_pc); 95 #endif 96 void EvaluateNextInstructionForSoftwareBreakpointSetup(nub_addr_t currentPC, uint32_t cpsr, bool currentPCIsThumb, nub_addr_t *nextPC, bool *nextPCIsThumb); 97 98 typedef enum RegisterSetTag 99 { 100 e_regSetALL = REGISTER_SET_ALL, 101 e_regSetGPR = ARM_THREAD_STATE, 102 e_regSetVFP = ARM_VFP_STATE, 103 e_regSetEXC = ARM_EXCEPTION_STATE, 104 e_regSetDBG = ARM_DEBUG_STATE, 105 kNumRegisterSets 106 } RegisterSet; 107 108 enum 109 { 110 Read = 0, 111 Write = 1, 112 kNumErrors = 2 113 }; 114 115 typedef arm_thread_state_t GPR; 116 typedef arm_vfp_state_t FPU; 117 typedef arm_exception_state_t EXC; 118 119 static const DNBRegisterInfo g_gpr_registers[]; 120 static const DNBRegisterInfo g_vfp_registers[]; 121 static const DNBRegisterInfo g_exc_registers[]; 122 static const DNBRegisterSetInfo g_reg_sets[]; 123 124 static const size_t k_num_gpr_registers; 125 static const size_t k_num_vfp_registers; 126 static const size_t k_num_exc_registers; 127 static const size_t k_num_all_registers; 128 static const size_t k_num_register_sets; 129 130 struct Context 131 { 132 GPR gpr; 133 FPU vfp; 134 EXC exc; 135 }; 136 137 struct State 138 { 139 Context context; 140 DBG dbg; 141 kern_return_t gpr_errs[2]; // Read/Write errors 142 kern_return_t vfp_errs[2]; // Read/Write errors 143 kern_return_t exc_errs[2]; // Read/Write errors 144 kern_return_t dbg_errs[2]; // Read/Write errors 145 State() 146 { 147 uint32_t i; 148 for (i=0; i<kNumErrors; i++) 149 { 150 gpr_errs[i] = -1; 151 vfp_errs[i] = -1; 152 exc_errs[i] = -1; 153 dbg_errs[i] = -1; 154 } 155 } 156 void InvalidateRegisterSetState(int set) 157 { 158 SetError (set, Read, -1); 159 } 160 kern_return_t GetError (int set, uint32_t err_idx) const 161 { 162 if (err_idx < kNumErrors) 163 { 164 switch (set) 165 { 166 // When getting all errors, just OR all values together to see if 167 // we got any kind of error. 168 case e_regSetALL: return gpr_errs[err_idx] | 169 vfp_errs[err_idx] | 170 exc_errs[err_idx] | 171 dbg_errs[err_idx] ; 172 case e_regSetGPR: return gpr_errs[err_idx]; 173 case e_regSetVFP: return vfp_errs[err_idx]; 174 case e_regSetEXC: return exc_errs[err_idx]; 175 case e_regSetDBG: return dbg_errs[err_idx]; 176 default: break; 177 } 178 } 179 return -1; 180 } 181 bool SetError (int set, uint32_t err_idx, kern_return_t err) 182 { 183 if (err_idx < kNumErrors) 184 { 185 switch (set) 186 { 187 case e_regSetALL: 188 gpr_errs[err_idx] = err; 189 vfp_errs[err_idx] = err; 190 dbg_errs[err_idx] = err; 191 exc_errs[err_idx] = err; 192 return true; 193 194 case e_regSetGPR: 195 gpr_errs[err_idx] = err; 196 return true; 197 198 case e_regSetVFP: 199 vfp_errs[err_idx] = err; 200 return true; 201 202 case e_regSetEXC: 203 exc_errs[err_idx] = err; 204 return true; 205 206 case e_regSetDBG: 207 dbg_errs[err_idx] = err; 208 return true; 209 default: break; 210 } 211 } 212 return false; 213 } 214 bool RegsAreValid (int set) const 215 { 216 return GetError(set, Read) == KERN_SUCCESS; 217 } 218 }; 219 220 kern_return_t GetGPRState (bool force); 221 kern_return_t GetVFPState (bool force); 222 kern_return_t GetEXCState (bool force); 223 kern_return_t GetDBGState (bool force); 224 225 kern_return_t SetGPRState (); 226 kern_return_t SetVFPState (); 227 kern_return_t SetEXCState (); 228 kern_return_t SetDBGState (bool also_set_on_task); 229 230 // Helper functions for watchpoint implementaions. 231 static void ClearWatchpointOccurred(); 232 static bool HasWatchpointOccurred(); 233 static bool IsWatchpointEnabled(const DBG &debug_state, uint32_t hw_index); 234 static nub_addr_t GetWatchAddress(const DBG &debug_state, uint32_t hw_index); 235 236 protected: 237 MachThread * m_thread; 238 State m_state; 239 DBG m_dbg_save; 240 nub_addr_t m_hw_single_chained_step_addr; 241 nub_addr_t m_last_decode_pc; 242 243 // The following member variables should be updated atomically. 244 int32_t m_watchpoint_hw_index; 245 bool m_watchpoint_did_occur; 246 bool m_watchpoint_resume_single_step_enabled; 247 }; 248 249 #endif // #if defined (__arm__) 250 #endif // #ifndef __DebugNubArchMachARM_h__ 251
