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 AuxVector(const lldb_private::DataExtractor & data)12AuxVector::AuxVector(const lldb_private::DataExtractor &data) { 13 ParseAuxv(data); 14 } 15 ParseAuxv(const lldb_private::DataExtractor & data)16void 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> GetAuxValue(enum EntryType entry_type) const34AuxVector::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 DumpToLog(lldb_private::Log * log) const41void 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 GetEntryName(EntryType type) const53const 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