lldb/source/Plugins/Process/Utility/AuxVector.cpp

   1 //===-- AuxVector.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 "AuxVector.h"
  10 #include <optional>
  11
  12 AuxVector::AuxVector(const lldb_private::DataExtractor &data) {
  13   ParseAuxv(data);
  14 }
  15
  16 void AuxVector::ParseAuxv(const lldb_private::DataExtractor &data) {
  17   lldb::offset_t offset = 0;
  18   const size_t value_type_size = data.GetAddressByteSize() * 2;
  19   while (data.ValidOffsetForDataOfSize(offset, value_type_size)) {
  20     // We're not reading an address but an int that could be 32 or 64 bit
  21     // depending on the address size, which is what GetAddress does.
  22     const uint64_t type = data.GetAddress(&offset);
  23     const uint64_t value = data.GetAddress(&offset);
  24     if (type == AUXV_AT_NULL)
  25       break;
  26     if (type == AUXV_AT_IGNORE)
  27       continue;
  28
  29     m_auxv_entries[type] = value;
  30   }
  31 }
  32
  33 std::optional<uint64_t>
  34 AuxVector::GetAuxValue(enum EntryType entry_type) const {
  35   auto it = m_auxv_entries.find(static_cast<uint64_t>(entry_type));
  36   if (it != m_auxv_entries.end())
  37     return it->second;
  38   return std::nullopt;
  39 }
  40
  41 void AuxVector::DumpToLog(lldb_private::Log *log) const {
  42   if (!log)
  43     return;
  44
  45   log->PutCString("AuxVector: ");
  46   for (auto entry : m_auxv_entries) {
  47     LLDB_LOGF(log, "   %s [%" PRIu64 "]: %" PRIx64,
  48               GetEntryName(static_cast<EntryType>(entry.first)), entry.first,
  49               entry.second);
  50   }
  51 }
  52
  53 const char *AuxVector::GetEntryName(EntryType type) const {
  54   const char *name = "AT_???";
  55
  56 #define ENTRY_NAME(_type)                                                      \
  57   _type:                                                                       \
  58   name = &#_type[5]
  59   switch (type) {
  60     case ENTRY_NAME(AUXV_AT_NULL);           break;
  61     case ENTRY_NAME(AUXV_AT_IGNORE);         break;
  62     case ENTRY_NAME(AUXV_AT_EXECFD);         break;
  63     case ENTRY_NAME(AUXV_AT_PHDR);           break;
  64     case ENTRY_NAME(AUXV_AT_PHENT);          break;
  65     case ENTRY_NAME(AUXV_AT_PHNUM);          break;
  66     case ENTRY_NAME(AUXV_AT_PAGESZ);         break;
  67     case ENTRY_NAME(AUXV_AT_BASE);           break;
  68     case ENTRY_NAME(AUXV_AT_FLAGS);          break;
  69     case ENTRY_NAME(AUXV_AT_ENTRY);          break;
  70     case ENTRY_NAME(AUXV_AT_NOTELF);         break;
  71     case ENTRY_NAME(AUXV_AT_UID);            break;
  72     case ENTRY_NAME(AUXV_AT_EUID);           break;
  73     case ENTRY_NAME(AUXV_AT_GID);            break;
  74     case ENTRY_NAME(AUXV_AT_EGID);           break;
  75     case ENTRY_NAME(AUXV_AT_CLKTCK);         break;
  76     case ENTRY_NAME(AUXV_AT_PLATFORM);       break;
  77     case ENTRY_NAME(AUXV_AT_HWCAP);          break;
  78     case ENTRY_NAME(AUXV_AT_FPUCW);          break;
  79     case ENTRY_NAME(AUXV_AT_DCACHEBSIZE);    break;
  80     case ENTRY_NAME(AUXV_AT_ICACHEBSIZE);    break;
  81     case ENTRY_NAME(AUXV_AT_UCACHEBSIZE);    break;
  82     case ENTRY_NAME(AUXV_AT_IGNOREPPC);      break;
  83     case ENTRY_NAME(AUXV_AT_SECURE);         break;
  84     case ENTRY_NAME(AUXV_AT_BASE_PLATFORM);  break;
  85     case ENTRY_NAME(AUXV_AT_RANDOM);         break;
  86     case ENTRY_NAME(AUXV_AT_HWCAP2);         break;
  87     case ENTRY_NAME(AUXV_AT_EXECFN);         break;
  88     case ENTRY_NAME(AUXV_AT_SYSINFO);        break;
  89     case ENTRY_NAME(AUXV_AT_SYSINFO_EHDR);   break;
  90     case ENTRY_NAME(AUXV_AT_L1I_CACHESHAPE); break;
  91     case ENTRY_NAME(AUXV_AT_L1D_CACHESHAPE); break;
  92     case ENTRY_NAME(AUXV_AT_L2_CACHESHAPE);  break;
  93     case ENTRY_NAME(AUXV_AT_L3_CACHESHAPE);  break;
  94     }
  95 #undef ENTRY_NAME
  96
  97     return name;
  98 }