1 //===-- ArchitecturePPC64.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 "Plugins/Architecture/PPC64/ArchitecturePPC64.h"
10 #include "lldb/Core/PluginManager.h"
11 #include "lldb/Symbol/Function.h"
12 #include "lldb/Symbol/Symbol.h"
13 #include "lldb/Target/RegisterContext.h"
14 #include "lldb/Target/Target.h"
15 #include "lldb/Target/Thread.h"
16 #include "lldb/Utility/ArchSpec.h"
17 
18 #include "llvm/BinaryFormat/ELF.h"
19 
20 using namespace lldb_private;
21 using namespace lldb;
22 
23 LLDB_PLUGIN_DEFINE(ArchitecturePPC64)
24 
25 void ArchitecturePPC64::Initialize() {
26   PluginManager::RegisterPlugin(GetPluginNameStatic(),
27                                 "PPC64-specific algorithms",
28                                 &ArchitecturePPC64::Create);
29 }
30 
31 void ArchitecturePPC64::Terminate() {
32   PluginManager::UnregisterPlugin(&ArchitecturePPC64::Create);
33 }
34 
35 std::unique_ptr<Architecture> ArchitecturePPC64::Create(const ArchSpec &arch) {
36   if (arch.GetTriple().isPPC64() &&
37       arch.GetTriple().getObjectFormat() == llvm::Triple::ObjectFormatType::ELF)
38     return std::unique_ptr<Architecture>(new ArchitecturePPC64());
39   return nullptr;
40 }
41 
42 static int32_t GetLocalEntryOffset(const Symbol &sym) {
43   unsigned char other = sym.GetFlags() >> 8 & 0xFF;
44   return llvm::ELF::decodePPC64LocalEntryOffset(other);
45 }
46 
47 size_t ArchitecturePPC64::GetBytesToSkip(Symbol &func,
48                                          const Address &curr_addr) const {
49   if (curr_addr.GetFileAddress() ==
50       func.GetFileAddress() + GetLocalEntryOffset(func))
51     return func.GetPrologueByteSize();
52   return 0;
53 }
54 
55 void ArchitecturePPC64::AdjustBreakpointAddress(const Symbol &func,
56                                                 Address &addr) const {
57   int32_t loffs = GetLocalEntryOffset(func);
58   if (!loffs)
59     return;
60 
61   addr.SetOffset(addr.GetOffset() + loffs);
62 }
63