1 //===-- RegisterContextLinux_i386.cpp -------------------------------------===//
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
RegisterContextLinux_i386(const ArchSpec & target_arch)89 RegisterContextLinux_i386::RegisterContextLinux_i386(
90 const ArchSpec &target_arch)
91 : RegisterContextLinux_x86(
92 target_arch,
93 {"orig_eax",
94 nullptr,
95 sizeof(((GPR *)nullptr)->orig_eax),
96 (LLVM_EXTENSION offsetof(GPR, orig_eax)),
97 eEncodingUint,
98 eFormatHex,
99 {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
100 LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},
101 nullptr,
102 nullptr,
103 nullptr}) {}
104
GetGPRSizeStatic()105 size_t RegisterContextLinux_i386::GetGPRSizeStatic() { return sizeof(GPR); }
106
GetRegisterInfo() const107 const RegisterInfo *RegisterContextLinux_i386::GetRegisterInfo() const {
108 switch (GetTargetArchitecture().GetMachine()) {
109 case llvm::Triple::x86:
110 case llvm::Triple::x86_64:
111 return g_register_infos_i386;
112 default:
113 assert(false && "Unhandled target architecture.");
114 return nullptr;
115 }
116 }
117
GetRegisterCount() const118 uint32_t RegisterContextLinux_i386::GetRegisterCount() const {
119 return static_cast<uint32_t>(sizeof(g_register_infos_i386) /
120 sizeof(g_register_infos_i386[0]));
121 }
122
GetUserRegisterCount() const123 uint32_t RegisterContextLinux_i386::GetUserRegisterCount() const {
124 return static_cast<uint32_t>(k_num_user_registers_i386);
125 }
126