contrib/llvm/tools/lldb/source/Plugins/Architecture/PPC64/ArchitecturePPC64.cpp

   1 //===-- ArchitecturePPC64.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 "Plugins/Architecture/PPC64/ArchitecturePPC64.h"
  11 #include "lldb/Core/PluginManager.h"
  12 #include "lldb/Symbol/Function.h"
  13 #include "lldb/Symbol/Symbol.h"
  14 #include "lldb/Target/RegisterContext.h"
  15 #include "lldb/Target/Target.h"
  16 #include "lldb/Target/Thread.h"
  17 #include "lldb/Utility/ArchSpec.h"
  18
  19 #include "llvm/BinaryFormat/ELF.h"
  20
  21 using namespace lldb_private;
  22 using namespace lldb;
  23
  24 ConstString ArchitecturePPC64::GetPluginNameStatic() {
  25   return ConstString("ppc64");
  26 }
  27
  28 void ArchitecturePPC64::Initialize() {
  29   PluginManager::RegisterPlugin(GetPluginNameStatic(),
  30                                 "PPC64-specific algorithms",
  31                                 &ArchitecturePPC64::Create);
  32 }
  33
  34 void ArchitecturePPC64::Terminate() {
  35   PluginManager::UnregisterPlugin(&ArchitecturePPC64::Create);
  36 }
  37
  38 std::unique_ptr<Architecture> ArchitecturePPC64::Create(const ArchSpec &arch) {
  39   if ((arch.GetMachine() != llvm::Triple::ppc64 &&
  40        arch.GetMachine() != llvm::Triple::ppc64le) ||
  41       arch.GetTriple().getObjectFormat() != llvm::Triple::ObjectFormatType::ELF)
  42     return nullptr;
  43   return std::unique_ptr<Architecture>(new ArchitecturePPC64());
  44 }
  45
  46 ConstString ArchitecturePPC64::GetPluginName() { return GetPluginNameStatic(); }
  47 uint32_t ArchitecturePPC64::GetPluginVersion() { return 1; }
  48
  49 static int32_t GetLocalEntryOffset(const Symbol &sym) {
  50   unsigned char other = sym.GetFlags() >> 8 & 0xFF;
  51   return llvm::ELF::decodePPC64LocalEntryOffset(other);
  52 }
  53
  54 size_t ArchitecturePPC64::GetBytesToSkip(Symbol &func,
  55                                          const Address &curr_addr) const {
  56   if (curr_addr.GetFileAddress() ==
  57       func.GetFileAddress() + GetLocalEntryOffset(func))
  58     return func.GetPrologueByteSize();
  59   return 0;
  60 }
  61
  62 void ArchitecturePPC64::AdjustBreakpointAddress(const Symbol &func,
  63                                                 Address &addr) const {
  64   int32_t loffs = GetLocalEntryOffset(func);
  65   if (!loffs)
  66     return;
  67
  68   addr.SetOffset(addr.GetOffset() + loffs);
  69 }