lldb/source/Plugins/Process/Utility/RegisterContextNetBSD_x86_64.cpp

   1 //===-- RegisterContextNetBSD_x86_64.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 "RegisterContextNetBSD_x86_64.h"
  10 #include "RegisterContextNetBSD_i386.h"
  11 #include "RegisterContextPOSIX_x86.h"
  12 #include "llvm/Support/Compiler.h"
  13 #include "llvm/TargetParser/Triple.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 // Include RegisterInfos_x86_64 to declare our g_register_infos_x86_64
  82 // structure.
  83 #define DECLARE_REGISTER_INFOS_X86_64_STRUCT
  84 #include "RegisterInfos_x86_64.h"
  85 #undef DECLARE_REGISTER_INFOS_X86_64_STRUCT
  86
  87 static std::vector<lldb_private::RegisterInfo> &GetPrivateRegisterInfoVector() {
  88   static std::vector<lldb_private::RegisterInfo> g_register_infos;
  89   return g_register_infos;
  90 }
  91
  92 static const RegisterInfo *
  93 GetRegisterInfo_i386(const lldb_private::ArchSpec &arch) {
  94   std::vector<lldb_private::RegisterInfo> &g_register_infos =
  95       GetPrivateRegisterInfoVector();
  96
  97   // Allocate RegisterInfo only once
  98   if (g_register_infos.empty()) {
  99     // Copy the register information from base class
 100     std::unique_ptr<RegisterContextNetBSD_i386> reg_interface(
 101         new RegisterContextNetBSD_i386(arch));
 102     const RegisterInfo *base_info = reg_interface->GetRegisterInfo();
 103     g_register_infos.insert(g_register_infos.end(), &base_info[0],
 104                             &base_info[k_num_registers_i386]);
 105
 106 // Include RegisterInfos_x86_64 to update the g_register_infos structure
 107 //  with x86_64 offsets.
 108 #define UPDATE_REGISTER_INFOS_I386_STRUCT_WITH_X86_64_OFFSETS
 109 #include "RegisterInfos_x86_64.h"
 110 #undef UPDATE_REGISTER_INFOS_I386_STRUCT_WITH_X86_64_OFFSETS
 111   }
 112
 113   return &g_register_infos[0];
 114 }
 115
 116 static const RegisterInfo *
 117 PrivateGetRegisterInfoPtr(const lldb_private::ArchSpec &target_arch) {
 118   switch (target_arch.GetMachine()) {
 119   case llvm::Triple::x86:
 120     return GetRegisterInfo_i386(target_arch);
 121   case llvm::Triple::x86_64:
 122     return g_register_infos_x86_64;
 123   default:
 124     assert(false && "Unhandled target architecture.");
 125     return nullptr;
 126   }
 127 }
 128
 129 static uint32_t
 130 PrivateGetRegisterCount(const lldb_private::ArchSpec &target_arch) {
 131   switch (target_arch.GetMachine()) {
 132   case llvm::Triple::x86: {
 133     assert(!GetPrivateRegisterInfoVector().empty() &&
 134            "i386 register info not yet filled.");
 135     return static_cast<uint32_t>(GetPrivateRegisterInfoVector().size());
 136   }
 137   case llvm::Triple::x86_64:
 138     return static_cast<uint32_t>(sizeof(g_register_infos_x86_64) /
 139                                  sizeof(g_register_infos_x86_64[0]));
 140   default:
 141     assert(false && "Unhandled target architecture.");
 142     return 0;
 143   }
 144 }
 145
 146 static uint32_t
 147 PrivateGetUserRegisterCount(const lldb_private::ArchSpec &target_arch) {
 148   switch (target_arch.GetMachine()) {
 149   case llvm::Triple::x86:
 150     return static_cast<uint32_t>(k_num_user_registers_i386);
 151   case llvm::Triple::x86_64:
 152     return static_cast<uint32_t>(k_num_user_registers_x86_64);
 153   default:
 154     assert(false && "Unhandled target architecture.");
 155     return 0;
 156   }
 157 }
 158
 159 RegisterContextNetBSD_x86_64::RegisterContextNetBSD_x86_64(
 160     const ArchSpec &target_arch)
 161     : lldb_private::RegisterInfoInterface(target_arch),
 162       m_register_info_p(PrivateGetRegisterInfoPtr(target_arch)),
 163       m_register_count(PrivateGetRegisterCount(target_arch)),
 164       m_user_register_count(PrivateGetUserRegisterCount(target_arch)) {}
 165
 166 size_t RegisterContextNetBSD_x86_64::GetGPRSize() const { return sizeof(GPR); }
 167
 168 const RegisterInfo *RegisterContextNetBSD_x86_64::GetRegisterInfo() const {
 169   return m_register_info_p;
 170 }
 171
 172 uint32_t RegisterContextNetBSD_x86_64::GetRegisterCount() const {
 173   return m_register_count;
 174 }
 175
 176 uint32_t RegisterContextNetBSD_x86_64::GetUserRegisterCount() const {
 177   return m_user_register_count;
 178 }