LibELF: Move AK/ELF/ into Libraries/LibELF/

Let's arrange things like this instead. It didn't feel right for all of
the ELF handling code to live in AK.

5 files changed, 1336 insertions, 0 deletions

diff --git a/Libraries/LibELF/ELFImage.cpp b/Libraries/LibELF/ELFImage.cpp
new file mode 100644
index 0000000000..dedfea994c
--- /dev/null
+++ b/Libraries/LibELF/ELFImage.cpp
@@ -0,0 +1,175 @@
+#include "ELFImage.h"
+#include <AK/kstdio.h>
+
+ELFImage::ELFImage(const u8* buffer)
+    : m_buffer(buffer)
+{
+    m_valid = parse();
+}
+
+ELFImage::~ELFImage()
+{
+}
+
+static const char* object_file_type_to_string(Elf32_Half type)
+{
+    switch (type) {
+    case ET_NONE:
+        return "None";
+    case ET_REL:
+        return "Relocatable";
+    case ET_EXEC:
+        return "Executable";
+    case ET_DYN:
+        return "Shared object";
+    case ET_CORE:
+        return "Core";
+    default:
+        return "(?)";
+    }
+}
+
+const char* ELFImage::section_index_to_string(unsigned index) const
+{
+    if (index == SHN_UNDEF)
+        return "Undefined";
+    if (index >= SHN_LORESERVE)
+        return "Reserved";
+    return section(index).name();
+}
+
+unsigned ELFImage::symbol_count() const
+{
+    return section(m_symbol_table_section_index).entry_count();
+}
+
+void ELFImage::dump() const
+{
+    kprintf("ELFImage{%p} {\n", this);
+    kprintf("    is_valid: %u\n", is_valid());
+
+    if (!is_valid()) {
+        kprintf("}\n");
+        return;
+    }
+
+    kprintf("    type:    %s\n", object_file_type_to_string(header().e_type));
+    kprintf("    machine: %u\n", header().e_machine);
+    kprintf("    entry:   %x\n", header().e_entry);
+    kprintf("    shoff:   %u\n", header().e_shoff);
+    kprintf("    shnum:   %u\n", header().e_shnum);
+    kprintf(" shstrndx:   %u\n", header().e_shstrndx);
+
+    for (unsigned i = 0; i < header().e_shnum; ++i) {
+        auto& section = this->section(i);
+        kprintf("    Section %u: {\n", i);
+        kprintf("        name: %s\n", section.name());
+        kprintf("        type: %x\n", section.type());
+        kprintf("      offset: %x\n", section.offset());
+        kprintf("        size: %u\n", section.size());
+        kprintf("        \n");
+        kprintf("    }\n");
+    }
+
+    kprintf("Symbol count: %u (table is %u)\n", symbol_count(), m_symbol_table_section_index);
+    for (unsigned i = 1; i < symbol_count(); ++i) {
+        auto& sym = symbol(i);
+        kprintf("Symbol @%u:\n", i);
+        kprintf("    Name: %s\n", sym.name());
+        kprintf("    In section: %s\n", section_index_to_string(sym.section_index()));
+        kprintf("    Value: %x\n", sym.value());
+        kprintf("    Size: %u\n", sym.size());
+    }
+
+    kprintf("}\n");
+}
+
+unsigned ELFImage::section_count() const
+{
+    return header().e_shnum;
+}
+
+unsigned ELFImage::program_header_count() const
+{
+    return header().e_phnum;
+}
+
+bool ELFImage::parse()
+{
+    // We only support i386.
+    if (header().e_machine != 3) {
+        kprintf("ELFImage::parse(): e_machine=%u not supported!\n", header().e_machine);
+        return false;
+    }
+
+    // First locate the string tables.
+    for (unsigned i = 0; i < section_count(); ++i) {
+        auto& sh = section_header(i);
+        if (sh.sh_type == SHT_SYMTAB) {
+            ASSERT(!m_symbol_table_section_index);
+            m_symbol_table_section_index = i;
+        }
+        if (sh.sh_type == SHT_STRTAB && i != header().e_shstrndx) {
+            ASSERT(!m_string_table_section_index);
+            m_string_table_section_index = i;
+        }
+    }
+    return true;
+}
+
+const char* ELFImage::section_header_table_string(unsigned offset) const
+{
+    auto& sh = section_header(header().e_shstrndx);
+    if (sh.sh_type != SHT_STRTAB)
+        return nullptr;
+    return raw_data(sh.sh_offset + offset);
+}
+
+const char* ELFImage::table_string(unsigned offset) const
+{
+    auto& sh = section_header(m_string_table_section_index);
+    if (sh.sh_type != SHT_STRTAB)
+        return nullptr;
+    return raw_data(sh.sh_offset + offset);
+}
+
+const char* ELFImage::raw_data(unsigned offset) const
+{
+    return reinterpret_cast<const char*>(m_buffer) + offset;
+}
+
+const Elf32_Ehdr& ELFImage::header() const
+{
+    return *reinterpret_cast<const Elf32_Ehdr*>(raw_data(0));
+}
+
+const Elf32_Phdr& ELFImage::program_header_internal(unsigned index) const
+{
+    ASSERT(index < header().e_phnum);
+    return *reinterpret_cast<const Elf32_Phdr*>(raw_data(header().e_phoff + (index * sizeof(Elf32_Phdr))));
+}
+
+const Elf32_Shdr& ELFImage::section_header(unsigned index) const
+{
+    ASSERT(index < header().e_shnum);
+    return *reinterpret_cast<const Elf32_Shdr*>(raw_data(header().e_shoff + (index * sizeof(Elf32_Shdr))));
+}
+
+const ELFImage::Symbol ELFImage::symbol(unsigned index) const
+{
+    ASSERT(index < symbol_count());
+    auto* raw_syms = reinterpret_cast<const Elf32_Sym*>(raw_data(section(m_symbol_table_section_index).offset()));
+    return Symbol(*this, index, raw_syms[index]);
+}
+
+const ELFImage::Section ELFImage::section(unsigned index) const
+{
+    ASSERT(index < section_count());
+    return Section(*this, index);
+}
+
+const ELFImage::ProgramHeader ELFImage::program_header(unsigned index) const
+{
+    ASSERT(index < program_header_count());
+    return ProgramHeader(*this, index);
+}
diff --git a/Libraries/LibELF/ELFImage.h b/Libraries/LibELF/ELFImage.h
new file mode 100644
index 0000000000..143b4005e7
--- /dev/null
+++ b/Libraries/LibELF/ELFImage.h
@@ -0,0 +1,177 @@
+#pragma once
+
+#include <AK/String.h>
+#include <AK/HashMap.h>
+#include <AK/OwnPtr.h>
+#include <Kernel/VM/VirtualAddress.h>
+#include <LibELF/exec_elf.h>
+
+class ELFImage {
+public:
+    explicit ELFImage(const u8*);
+    ~ELFImage();
+    void dump() const;
+    bool is_valid() const { return m_valid; }
+    bool parse();
+
+    class Section;
+    class RelocationSection;
+    class Symbol;
+    class Relocation;
+
+    class Symbol {
+    public:
+        Symbol(const ELFImage& image, unsigned index, const Elf32_Sym& sym)
+            : m_image(image)
+            , m_sym(sym)
+            , m_index(index)
+        {
+        }
+
+        ~Symbol() {}
+
+        const char* name() const { return m_image.table_string(m_sym.st_name); }
+        unsigned section_index() const { return m_sym.st_shndx; }
+        unsigned value() const { return m_sym.st_value; }
+        unsigned size() const { return m_sym.st_size; }
+        unsigned index() const { return m_index; }
+        unsigned type() const { return ELF32_ST_TYPE(m_sym.st_info); }
+        const Section section() const { return m_image.section(section_index()); }
+
+    private:
+        const ELFImage& m_image;
+        const Elf32_Sym& m_sym;
+        const unsigned m_index;
+    };
+
+    class ProgramHeader {
+    public:
+        ProgramHeader(const ELFImage& image, unsigned program_header_index)
+            : m_image(image)
+            , m_program_header(image.program_header_internal(program_header_index))
+            , m_program_header_index(program_header_index)
+        {
+        }
+        ~ProgramHeader() {}
+
+        unsigned index() const { return m_program_header_index; }
+        u32 type() const { return m_program_header.p_type; }
+        u32 flags() const { return m_program_header.p_flags; }
+        u32 offset() const { return m_program_header.p_offset; }
+        VirtualAddress vaddr() const { return VirtualAddress(m_program_header.p_vaddr); }
+        u32 size_in_memory() const { return m_program_header.p_memsz; }
+        u32 size_in_image() const { return m_program_header.p_filesz; }
+        u32 alignment() const { return m_program_header.p_align; }
+        bool is_readable() const { return flags() & PF_R; }
+        bool is_writable() const { return flags() & PF_W; }
+        bool is_executable() const { return flags() & PF_X; }
+        const char* raw_data() const { return m_image.raw_data(m_program_header.p_offset); }
+
+    private:
+        const ELFImage& m_image;
+        const Elf32_Phdr& m_program_header;
+        unsigned m_program_header_index { 0 };
+    };
+
+    class Section {
+    public:
+        Section(const ELFImage& image, unsigned sectionIndex)
+            : m_image(image)
+            , m_section_header(image.section_header(sectionIndex))
+            , m_section_index(sectionIndex)
+        {
+        }
+        ~Section() {}
+
+        const char* name() const { return m_image.section_header_table_string(m_section_header.sh_name); }
+        unsigned type() const { return m_section_header.sh_type; }
+        unsigned offset() const { return m_section_header.sh_offset; }
+        unsigned size() const { return m_section_header.sh_size; }
+        unsigned entry_size() const { return m_section_header.sh_entsize; }
+        unsigned entry_count() const { return !entry_size() ? 0 : size() / entry_size(); }
+        u32 address() const { return m_section_header.sh_addr; }
+        const char* raw_data() const { return m_image.raw_data(m_section_header.sh_offset); }
+        bool is_undefined() const { return m_section_index == SHN_UNDEF; }
+        u32 flags() const { return m_section_header.sh_flags; }
+        bool is_writable() const { return flags() & SHF_WRITE; }
+        bool is_executable() const { return flags() & PF_X; }
+
+    protected:
+        friend class RelocationSection;
+        const ELFImage& m_image;
+        const Elf32_Shdr& m_section_header;
+        unsigned m_section_index;
+    };
+
+    unsigned symbol_count() const;
+    unsigned section_count() const;
+    unsigned program_header_count() const;
+
+    const Symbol symbol(unsigned) const;
+    const Section section(unsigned) const;
+    const ProgramHeader program_header(unsigned const) const;
+
+    template<typename F>
+    void for_each_section(F) const;
+    template<typename F>
+    void for_each_section_of_type(unsigned, F) const;
+    template<typename F>
+    void for_each_symbol(F) const;
+    template<typename F>
+    void for_each_program_header(F) const;
+
+    bool is_executable() const { return header().e_type == ET_EXEC; }
+    bool is_relocatable() const { return header().e_type == ET_REL; }
+
+    VirtualAddress entry() const { return VirtualAddress(header().e_entry); }
+
+private:
+    bool parse_header();
+    const char* raw_data(unsigned offset) const;
+    const Elf32_Ehdr& header() const;
+    const Elf32_Shdr& section_header(unsigned) const;
+    const Elf32_Phdr& program_header_internal(unsigned) const;
+    const char* table_string(unsigned offset) const;
+    const char* section_header_table_string(unsigned offset) const;
+    const char* section_index_to_string(unsigned index) const;
+
+    const u8* m_buffer { nullptr };
+    bool m_valid { false };
+    unsigned m_symbol_table_section_index { 0 };
+    unsigned m_string_table_section_index { 0 };
+};
+
+template<typename F>
+inline void ELFImage::for_each_section(F func) const
+{
+    for (unsigned i = 0; i < section_count(); ++i)
+        func(section(i));
+}
+
+template<typename F>
+inline void ELFImage::for_each_section_of_type(unsigned type, F func) const
+{
+    for (unsigned i = 0; i < section_count(); ++i) {
+        auto& section = this->section(i);
+        if (section.type() == type) {
+            if (!func(section))
+                break;
+        }
+    }
+}
+
+template<typename F>
+inline void ELFImage::for_each_symbol(F func) const
+{
+    for (unsigned i = 0; i < symbol_count(); ++i) {
+        if (func(symbol(i)) == IterationDecision::Break)
+            break;
+    }
+}
+
+template<typename F>
+inline void ELFImage::for_each_program_header(F func) const
+{
+    for (unsigned i = 0; i < program_header_count(); ++i)
+        func(program_header(i));
+}
diff --git a/Libraries/LibELF/ELFLoader.cpp b/Libraries/LibELF/ELFLoader.cpp
new file mode 100644
index 0000000000..8c1e8302fa
--- /dev/null
+++ b/Libraries/LibELF/ELFLoader.cpp
@@ -0,0 +1,145 @@
+#include "ELFLoader.h"
+#include <AK/QuickSort.h>
+#include <AK/kstdio.h>
+
+#ifdef KERNEL
+#include <Kernel/VM/MemoryManager.h>
+#endif
+
+//#define ELFLOADER_DEBUG
+
+ELFLoader::ELFLoader(const u8* buffer)
+    : m_image(buffer)
+{
+}
+
+ELFLoader::~ELFLoader()
+{
+}
+
+bool ELFLoader::load()
+{
+#ifdef ELFLOADER_DEBUG
+    m_image.dump();
+#endif
+    if (!m_image.is_valid())
+        return false;
+
+    if (!layout())
+        return false;
+
+    return true;
+}
+
+bool ELFLoader::layout()
+{
+    bool failed = false;
+    m_image.for_each_program_header([&](const ELFImage::ProgramHeader& program_header) {
+        if (program_header.type() == PT_TLS) {
+#ifdef KERNEL
+            auto* tls_image = tls_section_hook(program_header.size_in_memory(), program_header.alignment());
+            if (!tls_image) {
+                failed = true;
+                return;
+            }
+            memcpy(tls_image, program_header.raw_data(), program_header.size_in_image());
+#endif
+            return;
+        }
+        if (program_header.type() != PT_LOAD)
+            return;
+#ifdef ELFLOADER_DEBUG
+        kprintf("PH: V%p %u r:%u w:%u\n", program_header.vaddr().get(), program_header.size_in_memory(), program_header.is_readable(), program_header.is_writable());
+#endif
+#ifdef KERNEL
+        if (program_header.is_writable()) {
+            auto* allocated_section = alloc_section_hook(
+                program_header.vaddr(),
+                program_header.size_in_memory(),
+                program_header.alignment(),
+                program_header.is_readable(),
+                program_header.is_writable(),
+                String::format("elf-alloc-%s%s", program_header.is_readable() ? "r" : "", program_header.is_writable() ? "w" : ""));
+            if (!allocated_section) {
+                failed = true;
+                return;
+            }
+            memcpy(program_header.vaddr().as_ptr(), program_header.raw_data(), program_header.size_in_image());
+        } else {
+            auto* mapped_section = map_section_hook(
+                program_header.vaddr(),
+                program_header.size_in_memory(),
+                program_header.alignment(),
+                program_header.offset(),
+                program_header.is_readable(),
+                program_header.is_writable(),
+                program_header.is_executable(),
+                String::format("elf-map-%s%s%s", program_header.is_readable() ? "r" : "", program_header.is_writable() ? "w" : "", program_header.is_executable() ? "x" : ""));
+            if (!mapped_section) {
+                failed = true;
+            }
+        }
+#endif
+    });
+    return !failed;
+}
+
+char* ELFLoader::symbol_ptr(const char* name)
+{
+    char* found_ptr = nullptr;
+    m_image.for_each_symbol([&](const ELFImage::Symbol symbol) {
+        if (symbol.type() != STT_FUNC)
+            return IterationDecision::Continue;
+        if (strcmp(symbol.name(), name))
+            return IterationDecision::Continue;
+        if (m_image.is_executable())
+            found_ptr = (char*)(size_t)symbol.value();
+        else
+            ASSERT_NOT_REACHED();
+        return IterationDecision::Break;
+    });
+    return found_ptr;
+}
+
+String ELFLoader::symbolicate(u32 address) const
+{
+    SortedSymbol* sorted_symbols = nullptr;
+#ifdef KERNEL
+    if (!m_sorted_symbols_region) {
+        m_sorted_symbols_region = MM.allocate_kernel_region(PAGE_ROUND_UP(m_image.symbol_count() * sizeof(SortedSymbol)), "Sorted symbols");
+        sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
+        size_t index = 0;
+        m_image.for_each_symbol([&](auto& symbol) {
+            sorted_symbols[index++] = { symbol.value(), symbol.name() };
+            return IterationDecision::Continue;
+        });
+        quick_sort(sorted_symbols, sorted_symbols + m_image.symbol_count(), [](auto& a, auto& b) {
+            return a.address < b.address;
+        });
+    } else {
+        sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
+    }
+#else
+    if (m_sorted_symbols.is_empty()) {
+        m_sorted_symbols.ensure_capacity(m_image.symbol_count());
+        m_image.for_each_symbol([this](auto& symbol) {
+            m_sorted_symbols.append({ symbol.value(), symbol.name() });
+            return IterationDecision::Continue;
+        });
+        quick_sort(m_sorted_symbols.begin(), m_sorted_symbols.end(), [](auto& a, auto& b) {
+            return a.address < b.address;
+        });
+    }
+    sorted_symbols = m_sorted_symbols.data();
+#endif
+
+    for (size_t i = 0; i < m_image.symbol_count(); ++i) {
+        if (sorted_symbols[i].address > address) {
+            if (i == 0)
+                return "!!";
+            auto& symbol = sorted_symbols[i - 1];
+            return String::format("%s +%u", symbol.name, address - symbol.address);
+        }
+    }
+    return "??";
+}
diff --git a/Libraries/LibELF/ELFLoader.h b/Libraries/LibELF/ELFLoader.h
new file mode 100644
index 0000000000..ab607c10ad
--- /dev/null
+++ b/Libraries/LibELF/ELFLoader.h
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <AK/Function.h>
+#include <AK/HashMap.h>
+#include <AK/OwnPtr.h>
+#include <AK/Vector.h>
+#include <LibELF/ELFImage.h>
+
+#ifdef KERNEL
+#include <Kernel/VM/VirtualAddress.h>
+class Region;
+#endif
+
+class ELFLoader {
+public:
+    explicit ELFLoader(const u8*);
+    ~ELFLoader();
+
+    bool load();
+#if defined(KERNEL)
+    Function<void*(VirtualAddress, size_t, size_t, bool, bool, const String&)> alloc_section_hook;
+    Function<void*(size_t, size_t)> tls_section_hook;
+    Function<void*(VirtualAddress, size_t, size_t, size_t, bool r, bool w, bool x, const String&)> map_section_hook;
+    VirtualAddress entry() const { return m_image.entry(); }
+#endif
+    char* symbol_ptr(const char* name);
+
+    bool has_symbols() const { return m_image.symbol_count(); }
+
+    String symbolicate(u32 address) const;
+
+private:
+    bool layout();
+    bool perform_relocations();
+    void* lookup(const ELFImage::Symbol&);
+    char* area_for_section(const ELFImage::Section&);
+    char* area_for_section_name(const char*);
+
+    struct PtrAndSize {
+        PtrAndSize() {}
+        PtrAndSize(char* p, unsigned s)
+            : ptr(p)
+            , size(s)
+        {
+        }
+
+        char* ptr { nullptr };
+        unsigned size { 0 };
+    };
+    ELFImage m_image;
+
+    struct SortedSymbol {
+        u32 address;
+        const char* name;
+    };
+#ifdef KERNEL
+    mutable OwnPtr<Region> m_sorted_symbols_region;
+#else
+    mutable Vector<SortedSymbol> m_sorted_symbols;
+#endif
+};
diff --git a/Libraries/LibELF/exec_elf.h b/Libraries/LibELF/exec_elf.h
new file mode 100644
index 0000000000..90dca3a6e3
--- /dev/null
+++ b/Libraries/LibELF/exec_elf.h
@@ -0,0 +1,778 @@
+/*	$OpenBSD: exec_elf.h,v 1.83 2019/01/22 23:23:18 jsg Exp $	*/
+/*
+ * Copyright (c) 1995, 1996 Erik Theisen.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This is the ELF ABI header file
+ * formerly known as "elf_abi.h".
+ */
+
+#ifndef _SYS_EXEC_ELF_H_
+#define _SYS_EXEC_ELF_H_
+
+#include <AK/Types.h>
+
+typedef uint8_t Elf_Byte;
+
+typedef uint32_t Elf32_Addr; /* Unsigned program address */
+typedef uint32_t Elf32_Off;  /* Unsigned file offset */
+typedef int32_t Elf32_Sword; /* Signed large integer */
+typedef uint32_t Elf32_Word; /* Unsigned large integer */
+typedef uint16_t Elf32_Half; /* Unsigned medium integer */
+typedef uint64_t Elf32_Lword;
+
+typedef uint64_t Elf64_Addr;
+typedef uint64_t Elf64_Off;
+typedef int32_t Elf64_Shalf;
+
+#ifdef __alpha__
+typedef int64_t Elf64_Sword;
+typedef uint64_t Elf64_Word;
+#else
+typedef int32_t Elf64_Sword;
+typedef uint32_t Elf64_Word;
+#endif
+
+typedef int64_t Elf64_Sxword;
+typedef uint64_t Elf64_Xword;
+typedef uint64_t Elf64_Lword;
+
+typedef uint32_t Elf64_Half;
+typedef uint16_t Elf64_Quarter;
+
+/*
+ * e_ident[] identification indexes
+ * See http://www.sco.com/developers/gabi/latest/ch4.eheader.html
+ */
+#define EI_MAG0 0       /* file ID */
+#define EI_MAG1 1       /* file ID */
+#define EI_MAG2 2       /* file ID */
+#define EI_MAG3 3       /* file ID */
+#define EI_CLASS 4      /* file class */
+#define EI_DATA 5       /* data encoding */
+#define EI_VERSION 6    /* ELF header version */
+#define EI_OSABI 7      /* OS/ABI ID */
+#define EI_ABIVERSION 8 /* ABI version */
+#define EI_PAD 9        /* start of pad bytes */
+#define EI_NIDENT 16    /* Size of e_ident[] */
+
+/* e_ident[] magic number */
+#define ELFMAG0 0x7f     /* e_ident[EI_MAG0] */
+#define ELFMAG1 'E'      /* e_ident[EI_MAG1] */
+#define ELFMAG2 'L'      /* e_ident[EI_MAG2] */
+#define ELFMAG3 'F'      /* e_ident[EI_MAG3] */
+#define ELFMAG "\177ELF" /* magic */
+#define SELFMAG 4        /* size of magic */
+
+/* e_ident[] file class */
+#define ELFCLASSNONE 0 /* invalid */
+#define ELFCLASS32 1   /* 32-bit objs */
+#define ELFCLASS64 2   /* 64-bit objs */
+#define ELFCLASSNUM 3  /* number of classes */
+
+/* e_ident[] data encoding */
+#define ELFDATANONE 0 /* invalid */
+#define ELFDATA2LSB 1 /* Little-Endian */
+#define ELFDATA2MSB 2 /* Big-Endian */
+#define ELFDATANUM 3  /* number of data encode defines */
+
+/* e_ident[] Operating System/ABI */
+#define ELFOSABI_SYSV 0         /* UNIX System V ABI */
+#define ELFOSABI_HPUX 1         /* HP-UX operating system */
+#define ELFOSABI_NETBSD 2       /* NetBSD */
+#define ELFOSABI_LINUX 3        /* GNU/Linux */
+#define ELFOSABI_HURD 4         /* GNU/Hurd */
+#define ELFOSABI_86OPEN 5       /* 86Open common IA32 ABI */
+#define ELFOSABI_SOLARIS 6      /* Solaris */
+#define ELFOSABI_MONTEREY 7     /* Monterey */
+#define ELFOSABI_IRIX 8         /* IRIX */
+#define ELFOSABI_FREEBSD 9      /* FreeBSD */
+#define ELFOSABI_TRU64 10       /* TRU64 UNIX */
+#define ELFOSABI_MODESTO 11     /* Novell Modesto */
+#define ELFOSABI_OPENBSD 12     /* OpenBSD */
+#define ELFOSABI_ARM 97         /* ARM */
+#define ELFOSABI_STANDALONE 255 /* Standalone (embedded) application */
+
+/* e_ident */
+#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && (ehdr).e_ident[EI_MAG1] == ELFMAG1 && (ehdr).e_ident[EI_MAG2] == ELFMAG2 && (ehdr).e_ident[EI_MAG3] == ELFMAG3)
+
+/* ELF Header */
+typedef struct elfhdr {
+    unsigned char e_ident[EI_NIDENT]; /* ELF Identification */
+    Elf32_Half e_type;                /* object file type */
+    Elf32_Half e_machine;             /* machine */
+    Elf32_Word e_version;             /* object file version */
+    Elf32_Addr e_entry;               /* virtual entry point */
+    Elf32_Off e_phoff;                /* program header table offset */
+    Elf32_Off e_shoff;                /* section header table offset */
+    Elf32_Word e_flags;               /* processor-specific flags */
+    Elf32_Half e_ehsize;              /* ELF header size */
+    Elf32_Half e_phentsize;           /* program header entry size */
+    Elf32_Half e_phnum;               /* number of program header entries */
+    Elf32_Half e_shentsize;           /* section header entry size */
+    Elf32_Half e_shnum;               /* number of section header entries */
+    Elf32_Half e_shstrndx;            /* section header table's "section
+					   header string table" entry offset */
+} Elf32_Ehdr;
+
+typedef struct {
+    unsigned char e_ident[EI_NIDENT]; /* Id bytes */
+    Elf64_Quarter e_type;             /* file type */
+    Elf64_Quarter e_machine;          /* machine type */
+    Elf64_Half e_version;             /* version number */
+    Elf64_Addr e_entry;               /* entry point */
+    Elf64_Off e_phoff;                /* Program hdr offset */
+    Elf64_Off e_shoff;                /* Section hdr offset */
+    Elf64_Half e_flags;               /* Processor flags */
+    Elf64_Quarter e_ehsize;           /* sizeof ehdr */
+    Elf64_Quarter e_phentsize;        /* Program header entry size */
+    Elf64_Quarter e_phnum;            /* Number of program headers */
+    Elf64_Quarter e_shentsize;        /* Section header entry size */
+    Elf64_Quarter e_shnum;            /* Number of section headers */
+    Elf64_Quarter e_shstrndx;         /* String table index */
+} Elf64_Ehdr;
+
+/* e_type */
+#define ET_NONE 0        /* No file type */
+#define ET_REL 1         /* relocatable file */
+#define ET_EXEC 2        /* executable file */
+#define ET_DYN 3         /* shared object file */
+#define ET_CORE 4        /* core file */
+#define ET_NUM 5         /* number of types */
+#define ET_LOPROC 0xff00 /* reserved range for processor */
+#define ET_HIPROC 0xffff /*  specific e_type */
+
+/* e_machine */
+#define EM_NONE 0  /* No Machine */
+#define EM_M32 1   /* AT&T WE 32100 */
+#define EM_SPARC 2 /* SPARC */
+#define EM_386 3   /* Intel 80386 */
+#define EM_68K 4   /* Motorola 68000 */
+#define EM_88K 5   /* Motorola 88000 */
+#define EM_486 6   /* Intel 80486 - unused? */
+#define EM_860 7   /* Intel 80860 */
+#define EM_MIPS 8  /* MIPS R3000 Big-Endian only */
+/*
+ * Don't know if EM_MIPS_RS4_BE,
+ * EM_SPARC64, EM_PARISC,
+ * or EM_PPC are ABI compliant
+ */
+#define EM_MIPS_RS4_BE 10 /* MIPS R4000 Big-Endian */
+#define EM_SPARC64 11     /* SPARC v9 64-bit unofficial */
+#define EM_PARISC 15      /* HPPA */
+#define EM_SPARC32PLUS 18 /* Enhanced instruction set SPARC */
+#define EM_PPC 20         /* PowerPC */
+#define EM_PPC64 21       /* PowerPC 64 */
+#define EM_ARM 40         /* Advanced RISC Machines ARM */
+#define EM_ALPHA 41       /* DEC ALPHA */
+#define EM_SH 42          /* Hitachi/Renesas Super-H */
+#define EM_SPARCV9 43     /* SPARC version 9 */
+#define EM_IA_64 50       /* Intel IA-64 Processor */
+#define EM_AMD64 62       /* AMD64 architecture */
+#define EM_X86_64 EM_AMD64
+#define EM_VAX 75      /* DEC VAX */
+#define EM_AARCH64 183 /* ARM 64-bit architecture (AArch64) */
+
+/* Non-standard */
+#define EM_ALPHA_EXP 0x9026 /* DEC ALPHA */
+#define EM__LAST__ (EM_ALPHA_EXP + 1)
+
+#define EM_NUM 22 /* number of machine types */
+
+/* Version */
+#define EV_NONE 0    /* Invalid */
+#define EV_CURRENT 1 /* Current */
+#define EV_NUM 2     /* number of versions */
+
+/* Magic for e_phnum: get real value from sh_info of first section header */
+#define PN_XNUM 0xffff
+
+/* Section Header */
+typedef struct {
+    Elf32_Word sh_name;      /* name - index into section header
+					   string table section */
+    Elf32_Word sh_type;      /* type */
+    Elf32_Word sh_flags;     /* flags */
+    Elf32_Addr sh_addr;      /* address */
+    Elf32_Off sh_offset;     /* file offset */
+    Elf32_Word sh_size;      /* section size */
+    Elf32_Word sh_link;      /* section header table index link */
+    Elf32_Word sh_info;      /* extra information */
+    Elf32_Word sh_addralign; /* address alignment */
+    Elf32_Word sh_entsize;   /* section entry size */
+} Elf32_Shdr;
+
+typedef struct {
+    Elf64_Half sh_name;       /* section name */
+    Elf64_Half sh_type;       /* section type */
+    Elf64_Xword sh_flags;     /* section flags */
+    Elf64_Addr sh_addr;       /* virtual address */
+    Elf64_Off sh_offset;      /* file offset */
+    Elf64_Xword sh_size;      /* section size */
+    Elf64_Half sh_link;       /* link to another */
+    Elf64_Half sh_info;       /* misc info */
+    Elf64_Xword sh_addralign; /* memory alignment */
+    Elf64_Xword sh_entsize;   /* table entry size */
+} Elf64_Shdr;
+
+/* Special Section Indexes */
+#define SHN_UNDEF 0          /* undefined */
+#define SHN_LORESERVE 0xff00 /* lower bounds of reserved indexes */
+#define SHN_LOPROC 0xff00    /* reserved range for processor */
+#define SHN_HIPROC 0xff1f    /*   specific section indexes */
+#define SHN_ABS 0xfff1       /* absolute value */
+#define SHN_COMMON 0xfff2    /* common symbol */
+#define SHN_XINDEX 0xffff    /* Escape -- index stored elsewhere. */
+#define SHN_HIRESERVE 0xffff /* upper bounds of reserved indexes */
+
+/* sh_type */
+#define SHT_NULL 0                  /* inactive */
+#define SHT_PROGBITS 1              /* program defined information */
+#define SHT_SYMTAB 2                /* symbol table section */
+#define SHT_STRTAB 3                /* string table section */
+#define SHT_RELA 4                  /* relocation section with addends*/
+#define SHT_HASH 5                  /* symbol hash table section */
+#define SHT_DYNAMIC 6               /* dynamic section */
+#define SHT_NOTE 7                  /* note section */
+#define SHT_NOBITS 8                /* no space section */
+#define SHT_REL 9                   /* relation section without addends */
+#define SHT_SHLIB 10                /* reserved - purpose unknown */
+#define SHT_DYNSYM 11               /* dynamic symbol table section */
+#define SHT_NUM 12                  /* number of section types */
+#define SHT_INIT_ARRAY 14           /* pointers to init functions */
+#define SHT_FINI_ARRAY 15           /* pointers to termination functions */
+#define SHT_PREINIT_ARRAY 16        /* ptrs to funcs called before init */
+#define SHT_GROUP 17                /* defines a section group */
+#define SHT_SYMTAB_SHNDX 18         /* Section indexes (see SHN_XINDEX). */
+#define SHT_LOOS 0x60000000         /* reserved range for OS specific */
+#define SHT_SUNW_dof 0x6ffffff4     /* used by dtrace */
+#define SHT_GNU_LIBLIST 0x6ffffff7  /* libraries to be prelinked */
+#define SHT_SUNW_move 0x6ffffffa    /* inf for partially init'ed symbols */
+#define SHT_SUNW_syminfo 0x6ffffffc /* ad symbol information */
+#define SHT_SUNW_verdef 0x6ffffffd  /* symbol versioning inf */
+#define SHT_SUNW_verneed 0x6ffffffe /* symbol versioning req */
+#define SHT_SUNW_versym 0x6fffffff  /* symbol versioning table */
+#define SHT_HIOS 0x6fffffff         /*  section header types */
+#define SHT_LOPROC 0x70000000       /* reserved range for processor */
+#define SHT_HIPROC 0x7fffffff       /*  specific section header types */
+#define SHT_LOUSER 0x80000000       /* reserved range for application */
+#define SHT_HIUSER 0xffffffff       /*  specific indexes */
+
+#define SHT_GNU_HASH 0x6ffffff6 /* GNU-style hash table section */
+
+/* Section names */
+#define ELF_BSS ".bss"                              /* uninitialized data */
+#define ELF_DATA ".data"                            /* initialized data */
+#define ELF_CTF ".SUNW_ctf"                         /* CTF data */
+#define ELF_DEBUG ".debug"                          /* debug */
+#define ELF_DYNAMIC ".dynamic"                      /* dynamic linking information */
+#define ELF_DYNSTR ".dynstr"                        /* dynamic string table */
+#define ELF_DYNSYM ".dynsym"                        /* dynamic symbol table */
+#define ELF_FINI ".fini"                            /* termination code */
+#define ELF_GOT ".got"                              /* global offset table */
+#define ELF_HASH ".hash"                            /* symbol hash table */
+#define ELF_INIT ".init"                            /* initialization code */
+#define ELF_REL_DATA ".rel.data"                    /* relocation data */
+#define ELF_REL_FINI ".rel.fini"                    /* relocation termination code */
+#define ELF_REL_INIT ".rel.init"                    /* relocation initialization code */
+#define ELF_REL_DYN ".rel.dyn"                      /* relocation dynamic link info */
+#define ELF_REL_RODATA ".rel.rodata"                /* relocation read-only data */
+#define ELF_REL_TEXT ".rel.text"                    /* relocation code */
+#define ELF_RODATA ".rodata"                        /* read-only data */
+#define ELF_SHSTRTAB ".shstrtab"                    /* section header string table */
+#define ELF_STRTAB ".strtab"                        /* string table */
+#define ELF_SYMTAB ".symtab"                        /* symbol table */
+#define ELF_TEXT ".text"                            /* code */
+#define ELF_OPENBSDRANDOMDATA ".openbsd.randomdata" /* constant randomdata */
+
+/* Section Attribute Flags - sh_flags */
+#define SHF_WRITE 0x1              /* Writable */
+#define SHF_ALLOC 0x2              /* occupies memory */
+#define SHF_EXECINSTR 0x4          /* executable */
+#define SHF_MERGE 0x10             /* may be merged */
+#define SHF_STRINGS 0x20           /* contains strings */
+#define SHF_INFO_LINK 0x40         /* sh_info holds section index */
+#define SHF_LINK_ORDER 0x80        /* ordering requirements */
+#define SHF_OS_NONCONFORMING 0x100 /* OS-specific processing required */
+#define SHF_GROUP 0x200            /* member of section group */
+#define SHF_TLS 0x400              /* thread local storage */
+#define SHF_COMPRESSED 0x800       /* contains compressed data */
+#define SHF_MASKOS 0x0ff00000      /* OS-specific semantics */
+#define SHF_MASKPROC 0xf0000000    /* reserved bits for processor */
+                                   /*  specific section attributes */
+
+/* Symbol Table Entry */
+typedef struct elf32_sym {
+    Elf32_Word st_name;     /* name - index into string table */
+    Elf32_Addr st_value;    /* symbol value */
+    Elf32_Word st_size;     /* symbol size */
+    unsigned char st_info;  /* type and binding */
+    unsigned char st_other; /* 0 - no defined meaning */
+    Elf32_Half st_shndx;    /* section header index */
+} Elf32_Sym;
+
+typedef struct {
+    Elf64_Half st_name;     /* Symbol name index in str table */
+    Elf_Byte st_info;       /* type / binding attrs */
+    Elf_Byte st_other;      /* unused */
+    Elf64_Quarter st_shndx; /* section index of symbol */
+    Elf64_Xword st_value;   /* value of symbol */
+    Elf64_Xword st_size;    /* size of symbol */
+} Elf64_Sym;
+
+/* Symbol table index */
+#define STN_UNDEF 0 /* undefined */
+
+/* Extract symbol info - st_info */
+#define ELF32_ST_BIND(x) ((x) >> 4)
+#define ELF32_ST_TYPE(x) (((unsigned int)x) & 0xf)
+#define ELF32_ST_INFO(b, t) (((b) << 4) + ((t)&0xf))
+
+#define ELF64_ST_BIND(x) ((x) >> 4)
+#define ELF64_ST_TYPE(x) (((unsigned int)x) & 0xf)
+#define ELF64_ST_INFO(b, t) (((b) << 4) + ((t)&0xf))
+
+/* Symbol Binding - ELF32_ST_BIND - st_info */
+#define STB_LOCAL 0   /* Local symbol */
+#define STB_GLOBAL 1  /* Global symbol */
+#define STB_WEAK 2    /* like global - lower precedence */
+#define STB_NUM 3     /* number of symbol bindings */
+#define STB_LOPROC 13 /* reserved range for processor */
+#define STB_HIPROC 15 /*  specific symbol bindings */
+
+/* Symbol type - ELF32_ST_TYPE - st_info */
+#define STT_NOTYPE 0  /* not specified */
+#define STT_OBJECT 1  /* data object */
+#define STT_FUNC 2    /* function */
+#define STT_SECTION 3 /* section */
+#define STT_FILE 4    /* file */
+#define STT_TLS 6     /* thread local storage */
+#define STT_LOPROC 13 /* reserved range for processor */
+#define STT_HIPROC 15 /*  specific symbol types */
+
+/* Extract symbol visibility - st_other */
+#define ELF_ST_VISIBILITY(v) ((v)&0x3)
+#define ELF32_ST_VISIBILITY ELF_ST_VISIBILITY
+#define ELF64_ST_VISIBILITY ELF_ST_VISIBILITY
+
+#define STV_DEFAULT 0   /* Visibility set by binding type */
+#define STV_INTERNAL 1  /* OS specific version of STV_HIDDEN */
+#define STV_HIDDEN 2    /* can only be seen inside own .so */
+#define STV_PROTECTED 3 /* HIDDEN inside, DEFAULT outside */
+
+/* Relocation entry with implicit addend */
+typedef struct {
+    Elf32_Addr r_offset; /* offset of relocation */
+    Elf32_Word r_info;   /* symbol table index and type */
+} Elf32_Rel;
+
+/* Relocation entry with explicit addend */
+typedef struct {
+    Elf32_Addr r_offset; /* offset of relocation */
+    Elf32_Word r_info;   /* symbol table index and type */
+    Elf32_Sword r_addend;
+} Elf32_Rela;
+
+/* Extract relocation info - r_info */
+#define ELF32_R_SYM(i) ((i) >> 8)
+#define ELF32_R_TYPE(i) ((unsigned char)(i))
+#define ELF32_R_INFO(s, t) (((s) << 8) + (unsigned char)(t))
+
+typedef struct {
+    Elf64_Xword r_offset; /* where to do it */
+    Elf64_Xword r_info;   /* index & type of relocation */
+} Elf64_Rel;
+
+typedef struct {
+    Elf64_Xword r_offset;  /* where to do it */
+    Elf64_Xword r_info;    /* index & type of relocation */
+    Elf64_Sxword r_addend; /* adjustment value */
+} Elf64_Rela;
+
+#define ELF64_R_SYM(info) ((info) >> 32)
+#define ELF64_R_TYPE(info) ((info)&0xFFFFFFFF)
+#define ELF64_R_INFO(s, t) (((s) << 32) + (uint32_t)(t))
+
+#if defined(__mips64__) && defined(__MIPSEL__)
+/*
+ * The 64-bit MIPS ELF ABI uses a slightly different relocation format
+ * than the regular ELF ABI: the r_info field is split into several
+ * pieces (see gnu/usr.bin/binutils-2.17/include/elf/mips.h for details).
+ */
+#    undef ELF64_R_SYM
+#    undef ELF64_R_TYPE
+#    undef ELF64_R_INFO
+#    define ELF64_R_TYPE(info) ((uint64_t)swap32((info) >> 32))
+#    define ELF64_R_SYM(info) ((info)&0xFFFFFFFF)
+#    define ELF64_R_INFO(s, t) (((uint64_t)swap32(t) << 32) + (uint32_t)(s))
+#endif /* __mips64__ && __MIPSEL__ */
+
+/* Program Header */
+typedef struct {
+    Elf32_Word p_type;   /* segment type */
+    Elf32_Off p_offset;  /* segment offset */
+    Elf32_Addr p_vaddr;  /* virtual address of segment */
+    Elf32_Addr p_paddr;  /* physical address - ignored? */
+    Elf32_Word p_filesz; /* number of bytes in file for seg. */
+    Elf32_Word p_memsz;  /* number of bytes in mem. for seg. */
+    Elf32_Word p_flags;  /* flags */
+    Elf32_Word p_align;  /* memory alignment */
+} Elf32_Phdr;
+
+typedef struct {
+    Elf64_Half p_type;    /* entry type */
+    Elf64_Half p_flags;   /* flags */
+    Elf64_Off p_offset;   /* offset */
+    Elf64_Addr p_vaddr;   /* virtual address */
+    Elf64_Addr p_paddr;   /* physical address */
+    Elf64_Xword p_filesz; /* file size */
+    Elf64_Xword p_memsz;  /* memory size */
+    Elf64_Xword p_align;  /* memory & file alignment */
+} Elf64_Phdr;
+
+/* Segment types - p_type */
+#define PT_NULL 0            /* unused */
+#define PT_LOAD 1            /* loadable segment */
+#define PT_DYNAMIC 2         /* dynamic linking section */
+#define PT_INTERP 3          /* the RTLD */
+#define PT_NOTE 4            /* auxiliary information */
+#define PT_SHLIB 5           /* reserved - purpose undefined */
+#define PT_PHDR 6            /* program header */
+#define PT_TLS 7             /* thread local storage */
+#define PT_LOOS 0x60000000   /* reserved range for OS */
+#define PT_HIOS 0x6fffffff   /*  specific segment types */
+#define PT_LOPROC 0x70000000 /* reserved range for processor */
+#define PT_HIPROC 0x7fffffff /*  specific segment types */
+
+#define PT_GNU_EH_FRAME 0x6474e550 /* Exception handling info */
+#define PT_GNU_RELRO 0x6474e552    /* Read-only after relocation */
+
+#define PT_OPENBSD_RANDOMIZE 0x65a3dbe6 /* fill with random data */
+#define PT_OPENBSD_WXNEEDED 0x65a3dbe7  /* program performs W^X violations */
+#define PT_OPENBSD_BOOTDATA 0x65a41be6  /* section for boot arguments */
+
+/* Segment flags - p_flags */
+#define PF_X 0x1               /* Executable */
+#define PF_W 0x2               /* Writable */
+#define PF_R 0x4               /* Readable */
+#define PF_MASKPROC 0xf0000000 /* reserved bits for processor */
+                               /*  specific segment flags */
+
+/* Dynamic structure */
+typedef struct {
+    Elf32_Sword d_tag; /* controls meaning of d_val */
+    union {
+        Elf32_Word d_val; /* Multiple meanings - see d_tag */
+        Elf32_Addr d_ptr; /* program virtual address */
+    } d_un;
+} Elf32_Dyn;
+
+typedef struct {
+    Elf64_Xword d_tag; /* controls meaning of d_val */
+    union {
+        Elf64_Addr d_ptr;
+        Elf64_Xword d_val;
+    } d_un;
+} Elf64_Dyn;
+
+/* Dynamic Array Tags - d_tag */
+#define DT_NULL 0             /* marks end of _DYNAMIC array */
+#define DT_NEEDED 1           /* string table offset of needed lib */
+#define DT_PLTRELSZ 2         /* size of relocation entries in PLT */
+#define DT_PLTGOT 3           /* address PLT/GOT */
+#define DT_HASH 4             /* address of symbol hash table */
+#define DT_STRTAB 5           /* address of string table */
+#define DT_SYMTAB 6           /* address of symbol table */
+#define DT_RELA 7             /* address of relocation table */
+#define DT_RELASZ 8           /* size of relocation table */
+#define DT_RELAENT 9          /* size of relocation entry */
+#define DT_STRSZ 10           /* size of string table */
+#define DT_SYMENT 11          /* size of symbol table entry */
+#define DT_INIT 12            /* address of initialization func. */
+#define DT_FINI 13            /* address of termination function */
+#define DT_SONAME 14          /* string table offset of shared obj */
+#define DT_RPATH 15           /* string table offset of library \
+                                 search path */
+#define DT_SYMBOLIC 16        /* start sym search in shared obj. */
+#define DT_REL 17             /* address of rel. tbl. w addends */
+#define DT_RELSZ 18           /* size of DT_REL relocation table */
+#define DT_RELENT 19          /* size of DT_REL relocation entry */
+#define DT_PLTREL 20          /* PLT referenced relocation entry */
+#define DT_DEBUG 21           /* bugger */
+#define DT_TEXTREL 22         /* Allow rel. mod. to unwritable seg */
+#define DT_JMPREL 23          /* add. of PLT's relocation entries */
+#define DT_BIND_NOW 24        /* Bind now regardless of env setting */
+#define DT_INIT_ARRAY 25      /* address of array of init func */
+#define DT_FINI_ARRAY 26      /* address of array of term func */
+#define DT_INIT_ARRAYSZ 27    /* size of array of init func */
+#define DT_FINI_ARRAYSZ 28    /* size of array of term func */
+#define DT_RUNPATH 29         /* strtab offset of lib search path */
+#define DT_FLAGS 30           /* Set of DF_* flags */
+#define DT_ENCODING 31        /* further DT_* follow encoding rules */
+#define DT_PREINIT_ARRAY 32   /* address of array of preinit func */
+#define DT_PREINIT_ARRAYSZ 33 /* size of array of preinit func */
+#define DT_LOOS 0x6000000d    /* reserved range for OS */
+#define DT_HIOS 0x6ffff000    /*  specific dynamic array tags */
+#define DT_LOPROC 0x70000000  /* reserved range for processor */
+#define DT_HIPROC 0x7fffffff  /*  specific dynamic array tags */
+
+/* some other useful tags */
+#define DT_GNU_HASH 0x6ffffef5  /* address of GNU hash table */
+#define DT_RELACOUNT 0x6ffffff9 /* if present, number of RELATIVE */
+#define DT_RELCOUNT 0x6ffffffa  /* relocs, which must come first */
+#define DT_FLAGS_1 0x6ffffffb
+
+/* Dynamic Flags - DT_FLAGS .dynamic entry */
+#define DF_ORIGIN 0x00000001
+#define DF_SYMBOLIC 0x00000002
+#define DF_TEXTREL 0x00000004
+#define DF_BIND_NOW 0x00000008
+#define DF_STATIC_TLS 0x00000010
+
+/* Dynamic Flags - DT_FLAGS_1 .dynamic entry */
+#define DF_1_NOW 0x00000001
+#define DF_1_GLOBAL 0x00000002
+#define DF_1_GROUP 0x00000004
+#define DF_1_NODELETE 0x00000008
+#define DF_1_LOADFLTR 0x00000010
+#define DF_1_INITFIRST 0x00000020
+#define DF_1_NOOPEN 0x00000040
+#define DF_1_ORIGIN 0x00000080
+#define DF_1_DIRECT 0x00000100
+#define DF_1_TRANS 0x00000200
+#define DF_1_INTERPOSE 0x00000400
+#define DF_1_NODEFLIB 0x00000800
+#define DF_1_NODUMP 0x00001000
+#define DF_1_CONLFAT 0x00002000
+
+/*
+ * Note header
+ */
+typedef struct {
+    Elf32_Word n_namesz;
+    Elf32_Word n_descsz;
+    Elf32_Word n_type;
+} Elf32_Nhdr;
+
+typedef struct {
+    Elf64_Half n_namesz;
+    Elf64_Half n_descsz;
+    Elf64_Half n_type;
+} Elf64_Nhdr;
+
+/*
+ * Note Definitions
+ */
+typedef struct {
+    Elf32_Word namesz;
+    Elf32_Word descsz;
+    Elf32_Word type;
+} Elf32_Note;
+
+typedef struct {
+    Elf64_Half namesz;
+    Elf64_Half descsz;
+    Elf64_Half type;
+} Elf64_Note;
+
+/* Values for n_type. */
+#define NT_PRSTATUS 1 /* Process status. */
+#define NT_FPREGSET 2 /* Floating point registers. */
+#define NT_PRPSINFO 3 /* Process state info. */
+
+/*
+ * OpenBSD-specific core file information.
+ *
+ * OpenBSD ELF core files use notes to provide information about
+ * the process's state.  The note name is "OpenBSD" for information
+ * that is global to the process, and "OpenBSD@nn", where "nn" is the
+ * thread ID of the thread that the information belongs to (such as
+ * register state).
+ *
+ * We use the following note identifiers:
+ *
+ *	NT_OPENBSD_PROCINFO
+ *		Note is a "elfcore_procinfo" structure.
+ *	NT_OPENBSD_AUXV
+ *		Note is a a bunch of Auxilliary Vectors, terminated by
+ *		an AT_NULL entry.
+ *	NT_OPENBSD_REGS
+ *		Note is a "reg" structure.
+ *	NT_OPENBSD_FPREGS
+ *		Note is a "fpreg" structure.
+ *
+ * Please try to keep the members of the "elfcore_procinfo" structure
+ * nicely aligned, and if you add elements, add them to the end and
+ * bump the version.
+ */
+
+#define NT_OPENBSD_PROCINFO 10
+#define NT_OPENBSD_AUXV 11
+
+#define NT_OPENBSD_REGS 20
+#define NT_OPENBSD_FPREGS 21
+#define NT_OPENBSD_XFPREGS 22
+#define NT_OPENBSD_WCOOKIE 23
+
+struct elfcore_procinfo {
+    /* Version 1 fields start here. */
+    uint32_t cpi_version; /* netbsd_elfcore_procinfo version */
+#define ELFCORE_PROCINFO_VERSION 1
+    uint32_t cpi_cpisize;   /* sizeof(netbsd_elfcore_procinfo) */
+    uint32_t cpi_signo;     /* killing signal */
+    uint32_t cpi_sigcode;   /* signal code */
+    uint32_t cpi_sigpend;   /* pending signals */
+    uint32_t cpi_sigmask;   /* blocked signals */
+    uint32_t cpi_sigignore; /* ignored signals */
+    uint32_t cpi_sigcatch;  /* signals being caught by user */
+    int32_t cpi_pid;        /* process ID */
+    int32_t cpi_ppid;       /* parent process ID */
+    int32_t cpi_pgrp;       /* process group ID */
+    int32_t cpi_sid;        /* session ID */
+    uint32_t cpi_ruid;      /* real user ID */
+    uint32_t cpi_euid;      /* effective user ID */
+    uint32_t cpi_svuid;     /* saved user ID */
+    uint32_t cpi_rgid;      /* real group ID */
+    uint32_t cpi_egid;      /* effective group ID */
+    uint32_t cpi_svgid;     /* saved group ID */
+    int8_t cpi_name[32];    /* copy of pr->ps_comm */
+};
+
+/*
+ * XXX - these _KERNEL items aren't part of the ABI!
+ */
+#if defined(_KERNEL) || defined(_DYN_LOADER)
+
+#    define ELF32_NO_ADDR ((uint32_t)~0) /* Indicates addr. not yet filled in */
+
+typedef struct {
+    Elf32_Sword au_id; /* 32-bit id */
+    Elf32_Word au_v;   /* 32-bit value */
+} Aux32Info;
+
+#    define ELF64_NO_ADDR ((uint64_t)~0) /* Indicates addr. not yet filled in */
+
+typedef struct {
+    Elf64_Shalf au_id; /* 32-bit id */
+    Elf64_Xword au_v;  /* 64-bit value */
+} Aux64Info;
+
+enum AuxID {
+    AUX_null = 0,
+    AUX_ignore = 1,
+    AUX_execfd = 2,
+    AUX_phdr = 3,        /* &phdr[0] */
+    AUX_phent = 4,       /* sizeof(phdr[0]) */
+    AUX_phnum = 5,       /* # phdr entries */
+    AUX_pagesz = 6,      /* PAGESIZE */
+    AUX_base = 7,        /* ld.so base addr */
+    AUX_flags = 8,       /* processor flags */
+    AUX_entry = 9,       /* a.out entry */
+    AUX_sun_uid = 2000,  /* euid */
+    AUX_sun_ruid = 2001, /* ruid */
+    AUX_sun_gid = 2002,  /* egid */
+    AUX_sun_rgid = 2003  /* rgid */
+};
+
+struct elf_args {
+    u_long arg_entry;     /* program entry point */
+    u_long arg_interp;    /* Interpreter load address */
+    u_long arg_phaddr;    /* program header address */
+    u_long arg_phentsize; /* Size of program header */
+    u_long arg_phnum;     /* Number of program headers */
+};
+
+#endif
+
+#if !defined(ELFSIZE) && defined(ARCH_ELFSIZE)
+#    define ELFSIZE ARCH_ELFSIZE
+#endif
+
+#if defined(ELFSIZE)
+#    define CONCAT(x, y) __CONCAT(x, y)
+#    define ELFNAME(x) CONCAT(elf, CONCAT(ELFSIZE, CONCAT(_, x)))
+#    define ELFDEFNNAME(x) CONCAT(ELF, CONCAT(ELFSIZE, CONCAT(_, x)))
+#endif
+
+#if defined(ELFSIZE) && (ELFSIZE == 32)
+#    define Elf_Ehdr Elf32_Ehdr
+#    define Elf_Phdr Elf32_Phdr
+#    define Elf_Shdr Elf32_Shdr
+#    define Elf_Sym Elf32_Sym
+#    define Elf_Rel Elf32_Rel
+#    define Elf_RelA Elf32_Rela
+#    define Elf_Dyn Elf32_Dyn
+#    define Elf_Half Elf32_Half
+#    define Elf_Word Elf32_Word
+#    define Elf_Sword Elf32_Sword
+#    define Elf_Addr Elf32_Addr
+#    define Elf_Off Elf32_Off
+#    define Elf_Nhdr Elf32_Nhdr
+#    define Elf_Note Elf32_Note
+
+#    define ELF_R_SYM ELF32_R_SYM
+#    define ELF_R_TYPE ELF32_R_TYPE
+#    define ELF_R_INFO ELF32_R_INFO
+#    define ELFCLASS ELFCLASS32
+
+#    define ELF_ST_BIND ELF32_ST_BIND
+#    define ELF_ST_TYPE ELF32_ST_TYPE
+#    define ELF_ST_INFO ELF32_ST_INFO
+
+#    define ELF_NO_ADDR ELF32_NO_ADDR
+#    define AuxInfo Aux32Info
+#elif defined(ELFSIZE) && (ELFSIZE == 64)
+#    define Elf_Ehdr Elf64_Ehdr
+#    define Elf_Phdr Elf64_Phdr
+#    define Elf_Shdr Elf64_Shdr
+#    define Elf_Sym Elf64_Sym
+#    define Elf_Rel Elf64_Rel
+#    define Elf_RelA Elf64_Rela
+#    define Elf_Dyn Elf64_Dyn
+#    define Elf_Half Elf64_Half
+#    define Elf_Word Elf64_Word
+#    define Elf_Sword Elf64_Sword
+#    define Elf_Addr Elf64_Addr
+#    define Elf_Off Elf64_Off
+#    define Elf_Nhdr Elf64_Nhdr
+#    define Elf_Note Elf64_Note
+
+#    define ELF_R_SYM ELF64_R_SYM
+#    define ELF_R_TYPE ELF64_R_TYPE
+#    define ELF_R_INFO ELF64_R_INFO
+#    define ELFCLASS ELFCLASS64
+
+#    define ELF_ST_BIND ELF64_ST_BIND
+#    define ELF_ST_TYPE ELF64_ST_TYPE
+#    define ELF_ST_INFO ELF64_ST_INFO
+
+#    define ELF_NO_ADDR ELF64_NO_ADDR
+#    define AuxInfo Aux64Info
+#endif
+
+#define ELF_TARG_VER 1 /* The ver for which this code is intended */
+
+#endif /* _SYS_EXEC_ELF_H_ */