1 files changed, 84 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Process/Utility/AuxVector.h b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/AuxVector.h
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index 000000000000..2670b34f6b0a
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+++ b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/AuxVector.h
@@ -0,0 +1,84 @@
+//===-- 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_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.
+  };
+
+  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