1 //===-- RegisterContextWindows_x86.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/lldb-private-types.h" 11 #include "lldb/Core/Error.h" 12 #include "lldb/Core/RegisterValue.h" 13 #include "lldb/Host/windows/HostThreadWindows.h" 14 #include "lldb/Host/windows/windows.h" 15 16 #include "lldb-x86-register-enums.h" 17 #include "ProcessWindowsLog.h" 18 #include "RegisterContext_x86.h" 19 #include "RegisterContextWindows_x86.h" 20 21 #include "llvm/ADT/STLExtras.h" 22 23 using namespace lldb; 24 using namespace lldb_private; 25 26 #define DEFINE_GPR(reg, alt) #reg, alt, 4, 0, eEncodingUint, eFormatHexUppercase 27 #define DEFINE_GPR_BIN(reg, alt) #reg, alt, 4, 0, eEncodingUint, eFormatBinary 28 29 namespace 30 { 31 32 // This enum defines the layout of the global RegisterInfo array. This is necessary because 33 // lldb register sets are defined in terms of indices into the register array. As such, the 34 // order of RegisterInfos defined in global registers array must match the order defined here. 35 // When defining the register set layouts, these values can appear in an arbitrary order, and that 36 // determines the order that register values are displayed in a dump. 37 enum RegisterIndex 38 { 39 eRegisterIndexEax, 40 eRegisterIndexEbx, 41 eRegisterIndexEcx, 42 eRegisterIndexEdx, 43 eRegisterIndexEdi, 44 eRegisterIndexEsi, 45 eRegisterIndexEbp, 46 eRegisterIndexEsp, 47 eRegisterIndexEip, 48 eRegisterIndexEflags 49 }; 50 51 // Array of all register information supported by Windows x86 52 RegisterInfo g_register_infos[] = 53 { 54 // Macro auto defines most stuff eh_frame DWARF GENERIC GDB LLDB VALUE REGS INVALIDATE REGS 55 // ============================== ======================= =================== ========================= =================== ================= ========== =============== 56 { DEFINE_GPR(eax, nullptr), { ehframe_eax_i386, dwarf_eax_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_eax_i386 }, nullptr, nullptr}, 57 { DEFINE_GPR(ebx, nullptr), { ehframe_ebx_i386, dwarf_ebx_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_ebx_i386 }, nullptr, nullptr}, 58 { DEFINE_GPR(ecx, nullptr), { ehframe_ecx_i386, dwarf_ecx_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_ecx_i386 }, nullptr, nullptr}, 59 { DEFINE_GPR(edx, nullptr), { ehframe_edx_i386, dwarf_edx_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_edx_i386 }, nullptr, nullptr}, 60 { DEFINE_GPR(edi, nullptr), { ehframe_edi_i386, dwarf_edi_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_edi_i386 }, nullptr, nullptr}, 61 { DEFINE_GPR(esi, nullptr), { ehframe_esi_i386, dwarf_esi_i386, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, lldb_esi_i386 }, nullptr, nullptr}, 62 { DEFINE_GPR(ebp, "fp"), { ehframe_ebp_i386, dwarf_ebp_i386, LLDB_REGNUM_GENERIC_FP, LLDB_INVALID_REGNUM, lldb_ebp_i386 }, nullptr, nullptr}, 63 { DEFINE_GPR(esp, "sp"), { ehframe_esp_i386, dwarf_esp_i386, LLDB_REGNUM_GENERIC_SP, LLDB_INVALID_REGNUM, lldb_esp_i386 }, nullptr, nullptr}, 64 { DEFINE_GPR(eip, "pc"), { ehframe_eip_i386, dwarf_eip_i386, LLDB_REGNUM_GENERIC_PC, LLDB_INVALID_REGNUM, lldb_eip_i386 }, nullptr, nullptr}, 65 { DEFINE_GPR_BIN(eflags, "flags"), { ehframe_eflags_i386, dwarf_eflags_i386, LLDB_REGNUM_GENERIC_FLAGS, LLDB_INVALID_REGNUM, lldb_eflags_i386}, nullptr, nullptr}, 66 }; 67 68 // Array of lldb register numbers used to define the set of all General Purpose Registers 69 uint32_t g_gpr_reg_indices[] = 70 { 71 eRegisterIndexEax, 72 eRegisterIndexEbx, 73 eRegisterIndexEcx, 74 eRegisterIndexEdx, 75 eRegisterIndexEdi, 76 eRegisterIndexEsi, 77 eRegisterIndexEbp, 78 eRegisterIndexEsp, 79 eRegisterIndexEip, 80 eRegisterIndexEflags 81 }; 82 83 RegisterSet g_register_sets[] = { 84 {"General Purpose Registers", "gpr", llvm::array_lengthof(g_gpr_reg_indices), g_gpr_reg_indices}, 85 }; 86 } 87 88 //------------------------------------------------------------------ 89 // Constructors and Destructors 90 //------------------------------------------------------------------ 91 RegisterContextWindows_x86::RegisterContextWindows_x86(Thread &thread, uint32_t concrete_frame_idx) 92 : RegisterContextWindows(thread, concrete_frame_idx) 93 { 94 } 95 96 RegisterContextWindows_x86::~RegisterContextWindows_x86() 97 { 98 } 99 100 size_t 101 RegisterContextWindows_x86::GetRegisterCount() 102 { 103 return llvm::array_lengthof(g_register_infos); 104 } 105 106 const RegisterInfo * 107 RegisterContextWindows_x86::GetRegisterInfoAtIndex(size_t reg) 108 { 109 return &g_register_infos[reg]; 110 } 111 112 size_t 113 RegisterContextWindows_x86::GetRegisterSetCount() 114 { 115 return llvm::array_lengthof(g_register_sets); 116 } 117 118 const RegisterSet * 119 RegisterContextWindows_x86::GetRegisterSet(size_t reg_set) 120 { 121 return &g_register_sets[reg_set]; 122 } 123 124 bool 125 RegisterContextWindows_x86::ReadRegister(const RegisterInfo *reg_info, RegisterValue ®_value) 126 { 127 if (!CacheAllRegisterValues()) 128 return false; 129 130 uint32_t reg = reg_info->kinds[eRegisterKindLLDB]; 131 switch (reg) 132 { 133 case lldb_eax_i386: 134 return ReadRegisterHelper(CONTEXT_INTEGER, "EAX", m_context.Eax, reg_value); 135 case lldb_ebx_i386: 136 return ReadRegisterHelper(CONTEXT_INTEGER, "EBX", m_context.Ebx, reg_value); 137 case lldb_ecx_i386: 138 return ReadRegisterHelper(CONTEXT_INTEGER, "ECX", m_context.Ecx, reg_value); 139 case lldb_edx_i386: 140 return ReadRegisterHelper(CONTEXT_INTEGER, "EDX", m_context.Edx, reg_value); 141 case lldb_edi_i386: 142 return ReadRegisterHelper(CONTEXT_INTEGER, "EDI", m_context.Edi, reg_value); 143 case lldb_esi_i386: 144 return ReadRegisterHelper(CONTEXT_INTEGER, "ESI", m_context.Esi, reg_value); 145 case lldb_ebp_i386: 146 return ReadRegisterHelper(CONTEXT_CONTROL, "EBP", m_context.Ebp, reg_value); 147 case lldb_esp_i386: 148 return ReadRegisterHelper(CONTEXT_CONTROL, "ESP", m_context.Esp, reg_value); 149 case lldb_eip_i386: 150 return ReadRegisterHelper(CONTEXT_CONTROL, "EIP", m_context.Eip, reg_value); 151 case lldb_eflags_i386: 152 return ReadRegisterHelper(CONTEXT_CONTROL, "EFLAGS", m_context.EFlags, reg_value); 153 default: 154 WINWARN_IFALL(WINDOWS_LOG_REGISTERS, "Requested unknown register %u", reg); 155 break; 156 } 157 return false; 158 } 159 160 bool 161 RegisterContextWindows_x86::ReadRegisterHelper(DWORD flags_required, const char *reg_name, DWORD value, 162 RegisterValue ®_value) const 163 { 164 if ((m_context.ContextFlags & flags_required) != flags_required) 165 { 166 WINLOG_IFALL(WINDOWS_LOG_REGISTERS, "Thread context doesn't have %s", reg_name); 167 return false; 168 } 169 WINLOG_IFALL(WINDOWS_LOG_REGISTERS, "Read value 0x%x from %s", value, reg_name); 170 reg_value.SetUInt32(value); 171 return true; 172 } 173