1 //===-- RegisterContextLinux_i386.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 "RegisterContextLinux_i386.h" 10 #include "RegisterContextPOSIX_x86.h" 11 12 using namespace lldb_private; 13 using namespace lldb; 14 15 struct GPR { 16 uint32_t ebx; 17 uint32_t ecx; 18 uint32_t edx; 19 uint32_t esi; 20 uint32_t edi; 21 uint32_t ebp; 22 uint32_t eax; 23 uint32_t ds; 24 uint32_t es; 25 uint32_t fs; 26 uint32_t gs; 27 uint32_t orig_eax; 28 uint32_t eip; 29 uint32_t cs; 30 uint32_t eflags; 31 uint32_t esp; 32 uint32_t ss; 33 }; 34 35 struct FPR_i386 { 36 uint16_t fctrl; // FPU Control Word (fcw) 37 uint16_t fstat; // FPU Status Word (fsw) 38 uint16_t ftag; // FPU Tag Word (ftw) 39 uint16_t fop; // Last Instruction Opcode (fop) 40 union { 41 struct { 42 uint64_t fip; // Instruction Pointer 43 uint64_t fdp; // Data Pointer 44 } x86_64; 45 struct { 46 uint32_t fioff; // FPU IP Offset (fip) 47 uint32_t fiseg; // FPU IP Selector (fcs) 48 uint32_t fooff; // FPU Operand Pointer Offset (foo) 49 uint32_t foseg; // FPU Operand Pointer Selector (fos) 50 } i386_; // Added _ in the end to avoid error with gcc defining i386 in some 51 // cases 52 } ptr; 53 uint32_t mxcsr; // MXCSR Register State 54 uint32_t mxcsrmask; // MXCSR Mask 55 MMSReg stmm[8]; // 8*16 bytes for each FP-reg = 128 bytes 56 XMMReg xmm[8]; // 8*16 bytes for each XMM-reg = 128 bytes 57 uint32_t padding[56]; 58 }; 59 60 struct UserArea { 61 GPR regs; // General purpose registers. 62 int32_t fpvalid; // True if FPU is being used. 63 FPR_i386 i387; // FPU registers. 64 uint32_t tsize; // Text segment size. 65 uint32_t dsize; // Data segment size. 66 uint32_t ssize; // Stack segment size. 67 uint32_t start_code; // VM address of text. 68 uint32_t start_stack; // VM address of stack bottom (top in rsp). 69 int32_t signal; // Signal causing core dump. 70 int32_t reserved; // Unused. 71 uint32_t ar0; // Location of GPR's. 72 uint32_t fpstate; // Location of FPR's. Should be a FXSTATE *, but this 73 // has to be 32-bits even on 64-bit systems. 74 uint32_t magic; // Identifier for core dumps. 75 char u_comm[32]; // Command causing core dump. 76 uint32_t u_debugreg[8]; // Debug registers (DR0 - DR7). 77 }; 78 79 #define DR_SIZE sizeof(((UserArea *)NULL)->u_debugreg[0]) 80 #define DR_0_OFFSET 0xFC 81 #define DR_OFFSET(reg_index) (DR_0_OFFSET + (reg_index * 4)) 82 #define FPR_SIZE(reg) sizeof(((FPR_i386 *)NULL)->reg) 83 84 // Include RegisterInfos_i386 to declare our g_register_infos_i386 structure. 85 #define DECLARE_REGISTER_INFOS_I386_STRUCT 86 #include "RegisterInfos_i386.h" 87 #undef DECLARE_REGISTER_INFOS_I386_STRUCT 88 89 RegisterContextLinux_i386::RegisterContextLinux_i386( 90 const ArchSpec &target_arch) 91 : RegisterInfoInterface(target_arch) { 92 RegisterInfo orig_ax = {"orig_eax", 93 nullptr, 94 sizeof(((GPR *)nullptr)->orig_eax), 95 (LLVM_EXTENSION offsetof(GPR, orig_eax)), 96 eEncodingUint, 97 eFormatHex, 98 {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, 99 LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, 100 LLDB_INVALID_REGNUM}, 101 nullptr, 102 nullptr, 103 nullptr, 104 0}; 105 d_register_infos.push_back(orig_ax); 106 } 107 108 size_t RegisterContextLinux_i386::GetGPRSize() const { return sizeof(GPR); } 109 110 const RegisterInfo *RegisterContextLinux_i386::GetRegisterInfo() const { 111 switch (m_target_arch.GetMachine()) { 112 case llvm::Triple::x86: 113 case llvm::Triple::x86_64: 114 return g_register_infos_i386; 115 default: 116 assert(false && "Unhandled target architecture."); 117 return nullptr; 118 } 119 } 120 121 uint32_t RegisterContextLinux_i386::GetRegisterCount() const { 122 return static_cast<uint32_t>(sizeof(g_register_infos_i386) / 123 sizeof(g_register_infos_i386[0])); 124 } 125 126 uint32_t RegisterContextLinux_i386::GetUserRegisterCount() const { 127 return static_cast<uint32_t>(k_num_user_registers_i386); 128 } 129 130 const std::vector<lldb_private::RegisterInfo> * 131 RegisterContextLinux_i386::GetDynamicRegisterInfoP() const { 132 return &d_register_infos; 133 } 134