1 //===-- RegisterContextLinux_i386.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 "RegisterContextLinux_i386.h"
11 #include "RegisterContextPOSIX_x86.h"
12
13 using namespace lldb_private;
14 using namespace lldb;
15
16 struct GPR {
17 uint32_t ebx;
18 uint32_t ecx;
19 uint32_t edx;
20 uint32_t esi;
21 uint32_t edi;
22 uint32_t ebp;
23 uint32_t eax;
24 uint32_t ds;
25 uint32_t es;
26 uint32_t fs;
27 uint32_t gs;
28 uint32_t orig_eax;
29 uint32_t eip;
30 uint32_t cs;
31 uint32_t eflags;
32 uint32_t esp;
33 uint32_t ss;
34 };
35
36 struct FPR_i386 {
37 uint16_t fctrl; // FPU Control Word (fcw)
38 uint16_t fstat; // FPU Status Word (fsw)
39 uint16_t ftag; // FPU Tag Word (ftw)
40 uint16_t fop; // Last Instruction Opcode (fop)
41 union {
42 struct {
43 uint64_t fip; // Instruction Pointer
44 uint64_t fdp; // Data Pointer
45 } x86_64;
46 struct {
47 uint32_t fioff; // FPU IP Offset (fip)
48 uint32_t fiseg; // FPU IP Selector (fcs)
49 uint32_t fooff; // FPU Operand Pointer Offset (foo)
50 uint32_t foseg; // FPU Operand Pointer Selector (fos)
51 } i386_; // Added _ in the end to avoid error with gcc defining i386 in some
52 // cases
53 } ptr;
54 uint32_t mxcsr; // MXCSR Register State
55 uint32_t mxcsrmask; // MXCSR Mask
56 MMSReg stmm[8]; // 8*16 bytes for each FP-reg = 128 bytes
57 XMMReg xmm[8]; // 8*16 bytes for each XMM-reg = 128 bytes
58 uint32_t padding[56];
59 };
60
61 struct UserArea {
62 GPR regs; // General purpose registers.
63 int32_t fpvalid; // True if FPU is being used.
64 FPR_i386 i387; // FPU registers.
65 uint32_t tsize; // Text segment size.
66 uint32_t dsize; // Data segment size.
67 uint32_t ssize; // Stack segment size.
68 uint32_t start_code; // VM address of text.
69 uint32_t start_stack; // VM address of stack bottom (top in rsp).
70 int32_t signal; // Signal causing core dump.
71 int32_t reserved; // Unused.
72 uint32_t ar0; // Location of GPR's.
73 uint32_t fpstate; // Location of FPR's. Should be a FXSTATE *, but this
74 // has to be 32-bits even on 64-bit systems.
75 uint32_t magic; // Identifier for core dumps.
76 char u_comm[32]; // Command causing core dump.
77 uint32_t u_debugreg[8]; // Debug registers (DR0 - DR7).
78 };
79
80 #define DR_SIZE sizeof(((UserArea *)NULL)->u_debugreg[0])
81 #define DR_0_OFFSET 0xFC
82 #define DR_OFFSET(reg_index) (DR_0_OFFSET + (reg_index * 4))
83 #define FPR_SIZE(reg) sizeof(((FPR_i386 *)NULL)->reg)
84
85 //---------------------------------------------------------------------------
86 // Include RegisterInfos_i386 to declare our g_register_infos_i386 structure.
87 //---------------------------------------------------------------------------
88 #define DECLARE_REGISTER_INFOS_I386_STRUCT
89 #include "RegisterInfos_i386.h"
90 #undef DECLARE_REGISTER_INFOS_I386_STRUCT
91
RegisterContextLinux_i386(const ArchSpec & target_arch)92 RegisterContextLinux_i386::RegisterContextLinux_i386(
93 const ArchSpec &target_arch)
94 : RegisterInfoInterface(target_arch) {
95 RegisterInfo orig_ax = {"orig_eax",
96 NULL,
97 sizeof(((GPR *)NULL)->orig_eax),
98 (LLVM_EXTENSION offsetof(GPR, orig_eax)),
99 eEncodingUint,
100 eFormatHex,
101 {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
102 LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
103 LLDB_INVALID_REGNUM},
104 nullptr,
105 nullptr,
106 nullptr,
107 0};
108 d_register_infos.push_back(orig_ax);
109 }
110
GetGPRSize() const111 size_t RegisterContextLinux_i386::GetGPRSize() const { return sizeof(GPR); }
112
GetRegisterInfo() const113 const RegisterInfo *RegisterContextLinux_i386::GetRegisterInfo() const {
114 switch (m_target_arch.GetMachine()) {
115 case llvm::Triple::x86:
116 case llvm::Triple::x86_64:
117 return g_register_infos_i386;
118 default:
119 assert(false && "Unhandled target architecture.");
120 return NULL;
121 }
122 }
123
GetRegisterCount() const124 uint32_t RegisterContextLinux_i386::GetRegisterCount() const {
125 return static_cast<uint32_t>(sizeof(g_register_infos_i386) /
126 sizeof(g_register_infos_i386[0]));
127 }
128
GetUserRegisterCount() const129 uint32_t RegisterContextLinux_i386::GetUserRegisterCount() const {
130 return static_cast<uint32_t>(k_num_user_registers_i386);
131 }
132
133 const std::vector<lldb_private::RegisterInfo> *
GetDynamicRegisterInfoP() const134 RegisterContextLinux_i386::GetDynamicRegisterInfoP() const {
135 return &d_register_infos;
136 }
137