AuxVector.cpp revision 355940 
1//===-- AuxVector.cpp -------------------------------------------*- C++ -*-===//
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 "AuxVector.h"
10
11AuxVector::AuxVector(const lldb_private::DataExtractor &data) {
12  ParseAuxv(data);
13}
14
15void AuxVector::ParseAuxv(const lldb_private::DataExtractor &data) {
16  lldb::offset_t offset = 0;
17  const size_t value_type_size = data.GetAddressByteSize() * 2;
18  while (data.ValidOffsetForDataOfSize(offset, value_type_size)) {
19    // We're not reading an address but an int that could be 32 or 64 bit
20    // depending on the address size, which is what GetAddress does.
21    const uint64_t type = data.GetAddress(&offset);
22    const uint64_t value = data.GetAddress(&offset);
23    if (type == AUXV_AT_NULL)
24      break;
25    if (type == AUXV_AT_IGNORE)
26      continue;
27
28    m_auxv_entries[type] = value;
29  }
30}
31
32llvm::Optional<uint64_t>
33AuxVector::GetAuxValue(enum EntryType entry_type) const {
34  auto it = m_auxv_entries.find(static_cast<uint64_t>(entry_type));
35  if (it != m_auxv_entries.end())
36    return it->second;
37  return llvm::None;
38}
39
40void AuxVector::DumpToLog(lldb_private::Log *log) const {
41  if (!log)
42    return;
43
44  log->PutCString("AuxVector: ");
45  for (auto entry : m_auxv_entries) {
46    log->Printf("   %s [%" PRIu64 "]: %" PRIx64,
47                GetEntryName(static_cast<EntryType>(entry.first)), entry.first,
48                entry.second);
49  }
50}
51
52const char *AuxVector::GetEntryName(EntryType type) const {
53  const char *name = "AT_???";
54
55#define ENTRY_NAME(_type)                                                      \
56  _type:                                                                       \
57  name = &#_type[5]
58  switch (type) {
59    case ENTRY_NAME(AUXV_AT_NULL);           break;
60    case ENTRY_NAME(AUXV_AT_IGNORE);         break;
61    case ENTRY_NAME(AUXV_AT_EXECFD);         break;
62    case ENTRY_NAME(AUXV_AT_PHDR);           break;
63    case ENTRY_NAME(AUXV_AT_PHENT);          break;
64    case ENTRY_NAME(AUXV_AT_PHNUM);          break;
65    case ENTRY_NAME(AUXV_AT_PAGESZ);         break;
66    case ENTRY_NAME(AUXV_AT_BASE);           break;
67    case ENTRY_NAME(AUXV_AT_FLAGS);          break;
68    case ENTRY_NAME(AUXV_AT_ENTRY);          break;
69    case ENTRY_NAME(AUXV_AT_NOTELF);         break;
70    case ENTRY_NAME(AUXV_AT_UID);            break;
71    case ENTRY_NAME(AUXV_AT_EUID);           break;
72    case ENTRY_NAME(AUXV_AT_GID);            break;
73    case ENTRY_NAME(AUXV_AT_EGID);           break;
74    case ENTRY_NAME(AUXV_AT_CLKTCK);         break;
75    case ENTRY_NAME(AUXV_AT_PLATFORM);       break;
76    case ENTRY_NAME(AUXV_AT_HWCAP);          break;
77    case ENTRY_NAME(AUXV_AT_FPUCW);          break;
78    case ENTRY_NAME(AUXV_AT_DCACHEBSIZE);    break;
79    case ENTRY_NAME(AUXV_AT_ICACHEBSIZE);    break;
80    case ENTRY_NAME(AUXV_AT_UCACHEBSIZE);    break;
81    case ENTRY_NAME(AUXV_AT_IGNOREPPC);      break;
82    case ENTRY_NAME(AUXV_AT_SECURE);         break;
83    case ENTRY_NAME(AUXV_AT_BASE_PLATFORM);  break;
84    case ENTRY_NAME(AUXV_AT_RANDOM);         break;
85    case ENTRY_NAME(AUXV_AT_EXECFN);         break;
86    case ENTRY_NAME(AUXV_AT_SYSINFO);        break;
87    case ENTRY_NAME(AUXV_AT_SYSINFO_EHDR);   break;
88    case ENTRY_NAME(AUXV_AT_L1I_CACHESHAPE); break;
89    case ENTRY_NAME(AUXV_AT_L1D_CACHESHAPE); break;
90    case ENTRY_NAME(AUXV_AT_L2_CACHESHAPE);  break;
91    case ENTRY_NAME(AUXV_AT_L3_CACHESHAPE);  break;
92    }
93#undef ENTRY_NAME
94
95    return name;
96}
97