1 //===-- RegisterContextLinux_i386.cpp -------------------------------------===//
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
7 //===---------------------------------------------------------------------===//
9 #include "RegisterContextLinux_i386.h"
10 #include "RegisterContextPOSIX_x86.h"
12 using namespace lldb_private;
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)
42 uint64_t fip; // Instruction Pointer
43 uint64_t fdp; // Data Pointer
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
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
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).
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)
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
89 RegisterContextLinux_i386::RegisterContextLinux_i386(
90 const ArchSpec &target_arch)
91 : RegisterInfoInterface(target_arch) {
92 RegisterInfo orig_ax = {"orig_eax",
94 sizeof(((GPR *)nullptr)->orig_eax),
95 (LLVM_EXTENSION offsetof(GPR, orig_eax)),
98 {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
99 LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
100 LLDB_INVALID_REGNUM},
105 d_register_infos.push_back(orig_ax);
108 size_t RegisterContextLinux_i386::GetGPRSize() const { return sizeof(GPR); }
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;
116 assert(false && "Unhandled target architecture.");
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]));
126 uint32_t RegisterContextLinux_i386::GetUserRegisterCount() const {
127 return static_cast<uint32_t>(k_num_user_registers_i386);
130 const std::vector<lldb_private::RegisterInfo> *
131 RegisterContextLinux_i386::GetDynamicRegisterInfoP() const {
132 return &d_register_infos;