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 ConstString ArchitecturePPC64::GetPluginNameStatic() {
26   return ConstString("ppc64");
27 }
28 
29 void ArchitecturePPC64::Initialize() {
30   PluginManager::RegisterPlugin(GetPluginNameStatic(),
31                                 "PPC64-specific algorithms",
32                                 &ArchitecturePPC64::Create);
33 }
34 
35 void ArchitecturePPC64::Terminate() {
36   PluginManager::UnregisterPlugin(&ArchitecturePPC64::Create);
37 }
38 
39 std::unique_ptr<Architecture> ArchitecturePPC64::Create(const ArchSpec &arch) {
40   if (arch.GetTriple().isPPC64() &&
41       arch.GetTriple().getObjectFormat() == llvm::Triple::ObjectFormatType::ELF)
42     return std::unique_ptr<Architecture>(new ArchitecturePPC64());
43   return nullptr;
44 }
45 
46 ConstString ArchitecturePPC64::GetPluginName() { return GetPluginNameStatic(); }
47 
48 static int32_t GetLocalEntryOffset(const Symbol &sym) {
49   unsigned char other = sym.GetFlags() >> 8 & 0xFF;
50   return llvm::ELF::decodePPC64LocalEntryOffset(other);
51 }
52 
53 size_t ArchitecturePPC64::GetBytesToSkip(Symbol &func,
54                                          const Address &curr_addr) const {
55   if (curr_addr.GetFileAddress() ==
56       func.GetFileAddress() + GetLocalEntryOffset(func))
57     return func.GetPrologueByteSize();
58   return 0;
59 }
60 
61 void ArchitecturePPC64::AdjustBreakpointAddress(const Symbol &func,
62                                                 Address &addr) const {
63   int32_t loffs = GetLocalEntryOffset(func);
64   if (!loffs)
65     return;
66 
67   addr.SetOffset(addr.GetOffset() + loffs);
68 }
69