d26ca8b872
This will be used to detect the presence of Arm's new Memory Tagging store only checking feature. This commit just adds the plumbing to get that value into the detection function. FreeBSD has not allocated a number for HWCAP3 and already has AT_ARGV defined as 29. So instead of attempting to read from FreeBSD processes, I've explicitly passed 0. We don't want to be reading some other entry accidentally. If/when FreeBSD adds HWCAP3 we can handle it like we do for AUXV_FREEBSD_AT_HWCAP. No extra tests here, those will be coming with the next change for MTE support.
86 lines
3.5 KiB
C++
86 lines
3.5 KiB
C++
//===-- AuxVector.h ---------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H
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#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_AUXVECTOR_H
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#include "lldb/Utility/DataExtractor.h"
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#include "lldb/Utility/Log.h"
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#include <optional>
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#include <unordered_map>
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class AuxVector {
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public:
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AuxVector(const lldb_private::DataExtractor &data);
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/// Constants describing the type of entry.
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/// On Linux and FreeBSD, running "LD_SHOW_AUXV=1 ./executable" will spew AUX
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/// information. Added AUXV prefix to avoid potential conflicts with system-
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/// defined macros. For FreeBSD, the numbers can be found in sys/elf_common.h.
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enum EntryType {
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AUXV_AT_NULL = 0, ///< End of auxv.
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AUXV_AT_IGNORE = 1, ///< Ignore entry.
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AUXV_AT_EXECFD = 2, ///< File descriptor of program.
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AUXV_AT_PHDR = 3, ///< Program headers.
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AUXV_AT_PHENT = 4, ///< Size of program header.
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AUXV_AT_PHNUM = 5, ///< Number of program headers.
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AUXV_AT_PAGESZ = 6, ///< Page size.
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AUXV_AT_BASE = 7, ///< Interpreter base address.
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AUXV_AT_FLAGS = 8, ///< Flags.
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AUXV_AT_ENTRY = 9, ///< Program entry point.
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AUXV_AT_NOTELF = 10, ///< Set if program is not an ELF.
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AUXV_AT_UID = 11, ///< UID.
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AUXV_AT_EUID = 12, ///< Effective UID.
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AUXV_AT_GID = 13, ///< GID.
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AUXV_AT_EGID = 14, ///< Effective GID.
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// At this point Linux and FreeBSD diverge and many of the following values
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// are Linux specific. If you use them make sure you are in Linux specific
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// code or they have the same value on other platforms.
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AUXV_AT_CLKTCK = 17, ///< Clock frequency (e.g. times(2)).
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AUXV_AT_PLATFORM = 15, ///< String identifying platform.
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AUXV_AT_HWCAP =
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16, ///< Machine dependent hints about processor capabilities.
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AUXV_AT_FPUCW = 18, ///< Used FPU control word.
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AUXV_AT_DCACHEBSIZE = 19, ///< Data cache block size.
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AUXV_AT_ICACHEBSIZE = 20, ///< Instruction cache block size.
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AUXV_AT_UCACHEBSIZE = 21, ///< Unified cache block size.
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AUXV_AT_IGNOREPPC = 22, ///< Entry should be ignored.
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AUXV_AT_SECURE = 23, ///< Boolean, was exec setuid-like?
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AUXV_AT_BASE_PLATFORM = 24, ///< String identifying real platforms.
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AUXV_AT_RANDOM = 25, ///< Address of 16 random bytes.
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AUXV_AT_HWCAP2 = 26, ///< Extension of AT_HWCAP.
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AUXV_AT_HWCAP3 = 29, ///< Extension of AT_HWCAP.
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AUXV_AT_EXECFN = 31, ///< Filename of executable.
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AUXV_AT_SYSINFO = 32, ///< Pointer to the global system page used for system
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/// calls and other nice things.
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AUXV_AT_SYSINFO_EHDR = 33,
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AUXV_AT_L1I_CACHESHAPE = 34, ///< Shapes of the caches.
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AUXV_AT_L1D_CACHESHAPE = 35,
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AUXV_AT_L2_CACHESHAPE = 36,
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AUXV_AT_L3_CACHESHAPE = 37,
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// Platform specific values which may overlap the Linux values.
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AUXV_FREEBSD_AT_HWCAP = 25, ///< FreeBSD specific AT_HWCAP value.
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};
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std::optional<uint64_t> GetAuxValue(enum EntryType entry_type) const;
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void DumpToLog(lldb_private::Log *log) const;
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const char *GetEntryName(EntryType type) const;
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private:
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void ParseAuxv(const lldb_private::DataExtractor &data);
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std::unordered_map<uint64_t, uint64_t> m_auxv_entries;
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};
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#endif
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