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1//===-- AuxVector.h ---------------------------------------------*- 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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H10#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H11 12#include "lldb/Utility/DataExtractor.h"13#include "lldb/Utility/Log.h"14#include <optional>15#include <unordered_map>16 17class AuxVector {18 19public:20 AuxVector(const lldb_private::DataExtractor &data);21 22 /// Constants describing the type of entry.23 /// On Linux and FreeBSD, running "LD_SHOW_AUXV=1 ./executable" will spew AUX24 /// information. Added AUXV prefix to avoid potential conflicts with system-25 /// defined macros. For FreeBSD, the numbers can be found in sys/elf_common.h.26 enum EntryType {27 AUXV_AT_NULL = 0, ///< End of auxv.28 AUXV_AT_IGNORE = 1, ///< Ignore entry.29 AUXV_AT_EXECFD = 2, ///< File descriptor of program.30 AUXV_AT_PHDR = 3, ///< Program headers.31 AUXV_AT_PHENT = 4, ///< Size of program header.32 AUXV_AT_PHNUM = 5, ///< Number of program headers.33 AUXV_AT_PAGESZ = 6, ///< Page size.34 AUXV_AT_BASE = 7, ///< Interpreter base address.35 AUXV_AT_FLAGS = 8, ///< Flags.36 AUXV_AT_ENTRY = 9, ///< Program entry point.37 AUXV_AT_NOTELF = 10, ///< Set if program is not an ELF.38 AUXV_AT_UID = 11, ///< UID.39 AUXV_AT_EUID = 12, ///< Effective UID.40 AUXV_AT_GID = 13, ///< GID.41 AUXV_AT_EGID = 14, ///< Effective GID.42 43 // At this point Linux and FreeBSD diverge and many of the following values44 // are Linux specific. If you use them make sure you are in Linux specific45 // code or they have the same value on other platforms.46 47 AUXV_AT_CLKTCK = 17, ///< Clock frequency (e.g. times(2)).48 AUXV_AT_PLATFORM = 15, ///< String identifying platform.49 AUXV_AT_HWCAP =50 16, ///< Machine dependent hints about processor capabilities.51 AUXV_AT_FPUCW = 18, ///< Used FPU control word.52 AUXV_AT_DCACHEBSIZE = 19, ///< Data cache block size.53 AUXV_AT_ICACHEBSIZE = 20, ///< Instruction cache block size.54 AUXV_AT_UCACHEBSIZE = 21, ///< Unified cache block size.55 AUXV_AT_IGNOREPPC = 22, ///< Entry should be ignored.56 AUXV_AT_SECURE = 23, ///< Boolean, was exec setuid-like?57 AUXV_AT_BASE_PLATFORM = 24, ///< String identifying real platforms.58 AUXV_AT_RANDOM = 25, ///< Address of 16 random bytes.59 AUXV_AT_HWCAP2 = 26, ///< Extension of AT_HWCAP.60 AUXV_AT_HWCAP3 = 29, ///< Extension of AT_HWCAP.61 AUXV_AT_EXECFN = 31, ///< Filename of executable.62 AUXV_AT_SYSINFO = 32, ///< Pointer to the global system page used for system63 /// calls and other nice things.64 AUXV_AT_SYSINFO_EHDR = 33,65 AUXV_AT_L1I_CACHESHAPE = 34, ///< Shapes of the caches.66 AUXV_AT_L1D_CACHESHAPE = 35,67 AUXV_AT_L2_CACHESHAPE = 36,68 AUXV_AT_L3_CACHESHAPE = 37,69 70 // Platform specific values which may overlap the Linux values.71 72 AUXV_FREEBSD_AT_HWCAP = 25, ///< FreeBSD specific AT_HWCAP value.73 // FreeBSD and Linux use the same AT_HWCAP2 value.74 AUXV_FREEBSD_AT_HWCAP3 = 38, ///< FreeBSD specific AT_HWCAP3 value.75 AUXV_FREEBSD_AT_HWCAP4 = 39, ///< FreeBSD specific AT_HWCAP4 value.76 77 };78 79 std::optional<uint64_t> GetAuxValue(enum EntryType entry_type) const;80 void DumpToLog(lldb_private::Log *log) const;81 const char *GetEntryName(EntryType type) const;82 83private:84 void ParseAuxv(const lldb_private::DataExtractor &data);85 86 std::unordered_map<uint64_t, uint64_t> m_auxv_entries;87};88 89#endif90