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//===-- AuxVector.h ---------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H
#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Log.h"
#include <optional>
#include <unordered_map>
class AuxVector {
public:
AuxVector(const lldb_private::DataExtractor &data);
/// Constants describing the type of entry.
/// On Linux and FreeBSD, running "LD_SHOW_AUXV=1 ./executable" will spew AUX
/// information. Added AUXV prefix to avoid potential conflicts with system-
/// defined macros. For FreeBSD, the numbers can be found in sys/elf_common.h.
enum EntryType {
AUXV_AT_NULL = 0, ///< End of auxv.
AUXV_AT_IGNORE = 1, ///< Ignore entry.
AUXV_AT_EXECFD = 2, ///< File descriptor of program.
AUXV_AT_PHDR = 3, ///< Program headers.
AUXV_AT_PHENT = 4, ///< Size of program header.
AUXV_AT_PHNUM = 5, ///< Number of program headers.
AUXV_AT_PAGESZ = 6, ///< Page size.
AUXV_AT_BASE = 7, ///< Interpreter base address.
AUXV_AT_FLAGS = 8, ///< Flags.
AUXV_AT_ENTRY = 9, ///< Program entry point.
AUXV_AT_NOTELF = 10, ///< Set if program is not an ELF.
AUXV_AT_UID = 11, ///< UID.
AUXV_AT_EUID = 12, ///< Effective UID.
AUXV_AT_GID = 13, ///< GID.
AUXV_AT_EGID = 14, ///< Effective GID.
// At this point Linux and FreeBSD diverge and many of the following values
// are Linux specific. If you use them make sure you are in Linux specific
// code or they have the same value on other platforms.
AUXV_AT_CLKTCK = 17, ///< Clock frequency (e.g. times(2)).
AUXV_AT_PLATFORM = 15, ///< String identifying platform.
AUXV_AT_HWCAP =
16, ///< Machine dependent hints about processor capabilities.
AUXV_AT_FPUCW = 18, ///< Used FPU control word.
AUXV_AT_DCACHEBSIZE = 19, ///< Data cache block size.
AUXV_AT_ICACHEBSIZE = 20, ///< Instruction cache block size.
AUXV_AT_UCACHEBSIZE = 21, ///< Unified cache block size.
AUXV_AT_IGNOREPPC = 22, ///< Entry should be ignored.
AUXV_AT_SECURE = 23, ///< Boolean, was exec setuid-like?
AUXV_AT_BASE_PLATFORM = 24, ///< String identifying real platforms.
AUXV_AT_RANDOM = 25, ///< Address of 16 random bytes.
AUXV_AT_HWCAP2 = 26, ///< Extension of AT_HWCAP.
AUXV_AT_HWCAP3 = 29, ///< Extension of AT_HWCAP.
AUXV_AT_EXECFN = 31, ///< Filename of executable.
AUXV_AT_SYSINFO = 32, ///< Pointer to the global system page used for system
/// calls and other nice things.
AUXV_AT_SYSINFO_EHDR = 33,
AUXV_AT_L1I_CACHESHAPE = 34, ///< Shapes of the caches.
AUXV_AT_L1D_CACHESHAPE = 35,
AUXV_AT_L2_CACHESHAPE = 36,
AUXV_AT_L3_CACHESHAPE = 37,
// Platform specific values which may overlap the Linux values.
AUXV_FREEBSD_AT_HWCAP = 25, ///< FreeBSD specific AT_HWCAP value.
// FreeBSD and Linux use the same AT_HWCAP2 value.
AUXV_FREEBSD_AT_HWCAP3 = 38, ///< FreeBSD specific AT_HWCAP3 value.
AUXV_FREEBSD_AT_HWCAP4 = 39, ///< FreeBSD specific AT_HWCAP4 value.
};
std::optional<uint64_t> GetAuxValue(enum EntryType entry_type) const;
void DumpToLog(lldb_private::Log *log) const;
const char *GetEntryName(EntryType type) const;
private:
void ParseAuxv(const lldb_private::DataExtractor &data);
std::unordered_map<uint64_t, uint64_t> m_auxv_entries;
};
#endif
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