1 //===-- RegisterContextNetBSD_x86_64.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 "RegisterContextNetBSD_x86_64.h"
11 #include "RegisterContextPOSIX_x86.h"
12 #include "llvm/ADT/Triple.h"
13 #include "llvm/Support/Compiler.h"
14 #include <cassert>
15 #include <cstddef>
16 
17 using namespace lldb_private;
18 using namespace lldb;
19 
20 // src/sys/arch/amd64/include/frame_regs.h
21 typedef struct _GPR {
22   uint64_t rdi;    /*  0 */
23   uint64_t rsi;    /*  1 */
24   uint64_t rdx;    /*  2 */
25   uint64_t rcx;    /*  3 */
26   uint64_t r8;     /*  4 */
27   uint64_t r9;     /*  5 */
28   uint64_t r10;    /*  6 */
29   uint64_t r11;    /*  7 */
30   uint64_t r12;    /*  8 */
31   uint64_t r13;    /*  9 */
32   uint64_t r14;    /* 10 */
33   uint64_t r15;    /* 11 */
34   uint64_t rbp;    /* 12 */
35   uint64_t rbx;    /* 13 */
36   uint64_t rax;    /* 14 */
37   uint64_t gs;     /* 15 */
38   uint64_t fs;     /* 16 */
39   uint64_t es;     /* 17 */
40   uint64_t ds;     /* 18 */
41   uint64_t trapno; /* 19 */
42   uint64_t err;    /* 20 */
43   uint64_t rip;    /* 21 */
44   uint64_t cs;     /* 22 */
45   uint64_t rflags; /* 23 */
46   uint64_t rsp;    /* 24 */
47   uint64_t ss;     /* 25 */
48 } GPR;
49 
50 struct DBG {
51   uint64_t dr[16]; /* debug registers */
52                    /* Index 0-3: debug address registers */
53                    /* Index 4-5: reserved */
54                    /* Index 6: debug status */
55                    /* Index 7: debug control */
56                    /* Index 8-15: reserved */
57 };
58 
59 /*
60  * src/sys/arch/amd64/include/mcontext.h
61  *
62  * typedef struct {
63  *       __gregset_t     __gregs;
64  *       __greg_t        _mc_tlsbase;
65  *       __fpregset_t    __fpregs;
66  * } mcontext_t;
67  */
68 
69 struct UserArea {
70   GPR gpr;
71   uint64_t mc_tlsbase;
72   FPR fpr;
73   DBG dbg;
74 };
75 
76 #define DR_OFFSET(reg_index)                                                   \
77   (LLVM_EXTENSION offsetof(UserArea, dbg) +                                    \
78    LLVM_EXTENSION offsetof(DBG, dr[reg_index]))
79 
80 
81 //---------------------------------------------------------------------------
82 // Include RegisterInfos_x86_64 to declare our g_register_infos_x86_64
83 // structure.
84 //---------------------------------------------------------------------------
85 #define DECLARE_REGISTER_INFOS_X86_64_STRUCT
86 #include "RegisterInfos_x86_64.h"
87 #undef DECLARE_REGISTER_INFOS_X86_64_STRUCT
88 
89 static const RegisterInfo *
90 PrivateGetRegisterInfoPtr(const lldb_private::ArchSpec &target_arch) {
91   switch (target_arch.GetMachine()) {
92   case llvm::Triple::x86_64:
93     return g_register_infos_x86_64;
94   default:
95     assert(false && "Unhandled target architecture.");
96     return nullptr;
97   }
98 }
99 
100 static uint32_t
101 PrivateGetRegisterCount(const lldb_private::ArchSpec &target_arch) {
102   switch (target_arch.GetMachine()) {
103   case llvm::Triple::x86_64:
104     return static_cast<uint32_t>(sizeof(g_register_infos_x86_64) /
105                                  sizeof(g_register_infos_x86_64[0]));
106   default:
107     assert(false && "Unhandled target architecture.");
108     return 0;
109   }
110 }
111 
112 RegisterContextNetBSD_x86_64::RegisterContextNetBSD_x86_64(
113     const ArchSpec &target_arch)
114     : lldb_private::RegisterInfoInterface(target_arch),
115       m_register_info_p(PrivateGetRegisterInfoPtr(target_arch)),
116       m_register_count(PrivateGetRegisterCount(target_arch)) {}
117 
118 size_t RegisterContextNetBSD_x86_64::GetGPRSize() const { return sizeof(GPR); }
119 
120 const RegisterInfo *RegisterContextNetBSD_x86_64::GetRegisterInfo() const {
121   return m_register_info_p;
122 }
123 
124 uint32_t RegisterContextNetBSD_x86_64::GetRegisterCount() const {
125   return m_register_count;
126 }
127