lldb/source/Plugins/Process/Utility/RegisterContextFreeBSD_i386.cpp

   1 //===-- RegisterContextFreeBSD_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 "RegisterContextFreeBSD_i386.h"
  10 #include "RegisterContextPOSIX_x86.h"
  11
  12 using namespace lldb_private;
  13 using namespace lldb;
  14
  15 // http://svnweb.freebsd.org/base/head/sys/x86/include/reg.h
  16 struct GPR {
  17   uint32_t fs;
  18   uint32_t es;
  19   uint32_t ds;
  20   uint32_t edi;
  21   uint32_t esi;
  22   uint32_t ebp;
  23   uint32_t isp;
  24   uint32_t ebx;
  25   uint32_t edx;
  26   uint32_t ecx;
  27   uint32_t eax;
  28   uint32_t trapno;
  29   uint32_t err;
  30   uint32_t eip;
  31   uint32_t cs;
  32   uint32_t eflags;
  33   uint32_t esp;
  34   uint32_t ss;
  35   uint32_t gs;
  36 };
  37
  38 struct DBG {
  39   uint32_t dr[8]; /* debug registers */
  40                   /* Index 0-3: debug address registers */
  41                   /* Index 4-5: reserved */
  42                   /* Index 6: debug status */
  43                   /* Index 7: debug control */
  44 };
  45
  46 using FPR_i386 = FXSAVE;
  47
  48 struct UserArea {
  49   GPR gpr;
  50   FPR_i386 i387;
  51   DBG dbg;
  52 };
  53
  54 #define DR_SIZE sizeof(uint32_t)
  55 #define DR_OFFSET(reg_index)                                                   \
  56   (LLVM_EXTENSION offsetof(UserArea, dbg) +                                    \
  57    LLVM_EXTENSION offsetof(DBG, dr[reg_index]))
  58
  59 // Include RegisterInfos_i386 to declare our g_register_infos_i386 structure.
  60 #define DECLARE_REGISTER_INFOS_I386_STRUCT
  61 #include "RegisterInfos_i386.h"
  62 #undef DECLARE_REGISTER_INFOS_I386_STRUCT
  63
  64 RegisterContextFreeBSD_i386::RegisterContextFreeBSD_i386(
  65     const ArchSpec &target_arch)
  66     : RegisterInfoInterface(target_arch) {}
  67
  68 size_t RegisterContextFreeBSD_i386::GetGPRSize() const { return sizeof(GPR); }
  69
  70 const RegisterInfo *RegisterContextFreeBSD_i386::GetRegisterInfo() const {
  71   switch (GetTargetArchitecture().GetMachine()) {
  72   case llvm::Triple::x86:
  73     return g_register_infos_i386;
  74   default:
  75     assert(false && "Unhandled target architecture.");
  76     return nullptr;
  77   }
  78 }
  79
  80 uint32_t RegisterContextFreeBSD_i386::GetRegisterCount() const {
  81   return static_cast<uint32_t>(sizeof(g_register_infos_i386) /
  82                                sizeof(g_register_infos_i386[0]));
  83 }