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RegisterContextLinux_i386.cpp
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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 
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;
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 
90  const ArchSpec &target_arch)
91  : RegisterInfoInterface(target_arch) {
92  RegisterInfo orig_ax = {"orig_eax",
93  NULL,
94  sizeof(((GPR *)NULL)->orig_eax),
95  (LLVM_EXTENSION offsetof(GPR, orig_eax)),
97  eFormatHex,
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 NULL;
118  }
119 }
120 
122  return static_cast<uint32_t>(sizeof(g_register_infos_i386) /
123  sizeof(g_register_infos_i386[0]));
124 }
125 
127  return static_cast<uint32_t>(k_num_user_registers_i386);
128 }
129 
130 const std::vector<lldb_private::RegisterInfo> *
132  return &d_register_infos;
133 }
Enumerations for broadcasting.
Definition: SBLaunchInfo.h:14
const lldb_private::RegisterInfo * GetRegisterInfo() const override
RegisterInfo interface to patch RegisterInfo structure for archs.
uint32_t GetUserRegisterCount() const override
An architecture specification class.
Definition: ArchSpec.h:32
const std::vector< lldb_private::RegisterInfo > * GetDynamicRegisterInfoP() const override
#define LLVM_EXTENSION
struct _GPR GPR
uint32_t GetRegisterCount() const override
Definition: SBAddress.h:15
RegisterContextLinux_i386(const lldb_private::ArchSpec &target_arch)
llvm::Triple::ArchType GetMachine() const
Returns a machine family for the current architecture.
Definition: ArchSpec.cpp:726
#define LLDB_INVALID_REGNUM
Definition: lldb-defines.h:90