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 }
99