lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_i386.cpp

   1 //===-- RegisterContextFreeBSDKernel_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 "RegisterContextFreeBSDKernel_i386.h"
  10
  11 #include "lldb/Target/Process.h"
  12 #include "lldb/Target/Thread.h"
  13 #include "lldb/Utility/RegisterValue.h"
  14 #include "llvm/Support/Endian.h"
  15
  16 using namespace lldb;
  17 using namespace lldb_private;
  18
  19 RegisterContextFreeBSDKernel_i386::RegisterContextFreeBSDKernel_i386(
  20     Thread &thread, RegisterInfoInterface *register_info, lldb::addr_t pcb_addr)
  21     : RegisterContextPOSIX_x86(thread, 0, register_info), m_pcb_addr(pcb_addr) {
  22 }
  23
  24 bool RegisterContextFreeBSDKernel_i386::ReadGPR() { return true; }
  25
  26 bool RegisterContextFreeBSDKernel_i386::ReadFPR() { return true; }
  27
  28 bool RegisterContextFreeBSDKernel_i386::WriteGPR() {
  29   assert(0);
  30   return false;
  31 }
  32
  33 bool RegisterContextFreeBSDKernel_i386::WriteFPR() {
  34   assert(0);
  35   return false;
  36 }
  37
  38 bool RegisterContextFreeBSDKernel_i386::ReadRegister(
  39     const RegisterInfo *reg_info, RegisterValue &value) {
  40   if (m_pcb_addr == LLDB_INVALID_ADDRESS)
  41     return false;
  42
  43   struct {
  44     llvm::support::ulittle32_t edi;
  45     llvm::support::ulittle32_t esi;
  46     llvm::support::ulittle32_t ebp;
  47     llvm::support::ulittle32_t esp;
  48     llvm::support::ulittle32_t ebx;
  49     llvm::support::ulittle32_t eip;
  50   } pcb;
  51
  52   Status error;
  53   size_t rd =
  54       m_thread.GetProcess()->ReadMemory(m_pcb_addr, &pcb, sizeof(pcb), error);
  55   if (rd != sizeof(pcb))
  56     return false;
  57
  58   uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
  59   switch (reg) {
  60 #define REG(x)                                                                 \
  61   case lldb_##x##_i386:                                                      \
  62     value = pcb.x;                                                             \
  63     break;
  64
  65     REG(edi);
  66     REG(esi);
  67     REG(ebp);
  68     REG(esp);
  69     REG(eip);
  70
  71 #undef REG
  72
  73   default:
  74     return false;
  75   }
  76
  77   return true;
  78 }
  79
  80 bool RegisterContextFreeBSDKernel_i386::WriteRegister(
  81     const RegisterInfo *reg_info, const RegisterValue &value) {
  82   return false;
  83 }