10d7352c7a
These entries serve the same purpose as the Linux HWCAPs but have been
assigned different numbers as FreeBSD had already used the Linux ones.
The numbers were assigned in:
85007872d1
In theory we can read these for the purposes of register field
detection, even on earlier versions of FreeBSD. As the aux data is a
key-value structure, we simply won't find the new numbers on older
systems.
However, FreeBSD has not defined any feature bits for HWACP3 and 4. It
is likley that they will match the Linux feature bits, but I have no
proof of that yet.
For instance, FEAT_MTE_STORE_ONLY is indicated by a HWCAP3 feature bit
on Linux. FreeBSD does not support this feature at all yet.
So for now, these values exist for future use and are not used for
register field detection on FreeBSD.
90 lines
3.7 KiB
C++
90 lines
3.7 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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// FreeBSD and Linux use the same AT_HWCAP2 value.
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AUXV_FREEBSD_AT_HWCAP3 = 38, ///< FreeBSD specific AT_HWCAP3 value.
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AUXV_FREEBSD_AT_HWCAP4 = 39, ///< FreeBSD specific AT_HWCAP4 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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