/*
* elf32.h
*
* Basic Data Structures for 32-bit ELF Object Format Files
*
* The data structures in this file come primarily from this specification:
*
*    Tool Interface Standard (TIS)
*    Executable and Linking Format (ELF) Specification
*    Version 1.2
*
*    TIS Committee
*    May 1995
*
* Additions and enhancements from this specification are also included:
*
*    System V Application Binary Interface
*    DRAFT 17
*    December 2003
*
*    http://sco.com/developers/gabi/2003-12-17/contents.html
*
*
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*
*/

#ifndef ELF32_H
#define ELF32_H

#include <inttypes.h>

/*---------------------------------------------------------------------------*/
/* 32-Bit Data Types (Figure 1-2, page 1-2)                                  */
/*---------------------------------------------------------------------------*/
typedef uint32_t Elf32_Addr;
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Off;
typedef  int32_t Elf32_Sword;
typedef uint32_t Elf32_Word;


/*****************************************************************************/
/* ELF Header                                                                */
/* PP. 1-4                                                                   */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* ELF Identification Indexes (indexes into Elf32_Ehdr.e_ident[] below)      */
/*---------------------------------------------------------------------------*/
enum
{
   EI_MAG0       = 0,   /* File identification          */
   EI_MAG1       = 1,   /* File identification          */
   EI_MAG2       = 2,   /* File identification          */
   EI_MAG3       = 3,   /* File identification          */
   EI_CLASS      = 4,   /* File class                   */
   EI_DATA       = 5,   /* Data encoding                */
   EI_VERSION    = 6,   /* File version                 */
   EI_OSABI      = 7,   /* Operating system / ABI       */
   EI_ABIVERSION = 8,   /* ABI version                  */
   EI_PAD        = 9,   /* Start of padding bytes       */
   EI_NIDENT     = 16   /* Size of Elf32_Ehdr.e_ident[] */
};


/*---------------------------------------------------------------------------*/
/* ELF Header Data Structure                                                 */
/*---------------------------------------------------------------------------*/
struct Elf32_Ehdr
{
   uint8_t     e_ident[EI_NIDENT];   /* ELF Magic Number                     */
   Elf32_Half  e_type;               /* Object File Type                     */
   Elf32_Half  e_machine;            /* Target Processor                     */
   Elf32_Word  e_version;            /* Object File Version                  */
   Elf32_Addr  e_entry;              /* 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;             /* Size of ELF header                   */
   Elf32_Half  e_phentsize;          /* Size of a Program Header             */
   Elf32_Half  e_phnum;              /* # Entries in Program Header Table    */
   Elf32_Half  e_shentsize;          /* Size of a Section Header             */
   Elf32_Half  e_shnum;              /* # Entries in Section Header Table    */
   Elf32_Half  e_shstrndx;           /* Section Name String Table Section    */
};


/*---------------------------------------------------------------------------*/
/* Object File Types (value of "e_type")                                     */
/*---------------------------------------------------------------------------*/
enum
{
   ET_NONE   = 0,       /* No file type                   */
   ET_REL    = 1,       /* Relocatable file               */
   ET_EXEC   = 2,       /* Executable file                */
   ET_DYN    = 3,       /* Shared object file             */
   ET_CORE   = 4,       /* Core file                      */
   ET_LOOS   = 0xfe00,  /* First OS-specific value        */
   ET_HIPS   = 0xfeff,  /* Last  OS-specific value        */
   ET_LOPROC = 0xff00,  /* First processor-specific value */
   ET_HIPROC = 0xffff   /* Last  processor-specific value */
};


/*---------------------------------------------------------------------------*/
/* Target Processors (value of "e_machine")                                  */
/*---------------------------------------------------------------------------*/
enum
{
   EM_NONE        =   0,  /* No machine                                      */
   EM_M32         =   1,  /* AT&T WE 32100                                   */
   EM_SPARC       =   2,  /* SPARC                                           */
   EM_386         =   3,  /* Intel 80386                                     */
   EM_68K         =   4,  /* Motorola 68000                                  */
   EM_88K         =   5,  /* Motorola 88000                                  */
   EM_860         =   7,  /* Intel 80860                                     */
   EM_MIPS        =   8,  /* MIPS I Architecture                             */
   EM_S370        =   9,  /* IBM System/370 Processor                        */
   EM_MIPS_RS3_LE =  10,  /* MIPS RS3000 Little-endian                       */
   EM_PARISC      =  15,  /* Hewlett-Packard PA-RISC                         */
   EM_VPP500      =  17,  /* Fujitsu VPP500                                  */
   EM_SPARC32PLUS =  18,  /* Enhanced instruction set SPARC                  */
   EM_960         =  19,  /* Intel 80960                                     */
   EM_PPC         =  20,  /* PowerPC                                         */
   EM_PPC64       =  21,  /* 64-bit PowerPC                                  */
   EM_S390        =  22,  /* IBM System/390 Processor                        */
   EM_V800        =  36,  /* NEC V800                                        */
   EM_FR20        =  37,  /* Fujitsu FR20                                    */
   EM_RH32        =  38,  /* TRW RH-32                                       */
   EM_RCE         =  39,  /* Motorola RCE                                    */
   EM_ARM         =  40,  /* Advanced RISC Machines ARM                      */
   EM_ALPHA       =  41,  /* Digital Alpha                                   */
   EM_SH          =  42,  /* Hitachi SH                                      */
   EM_SPARCV9     =  43,  /* SPARC Version 9                                 */
   EM_TRICORE     =  44,  /* Siemens TriCore embedded processor              */
   EM_ARC         =  45,  /* "Argonaut RISC Core, Argonaut Technologies Inc. */
   EM_H8_300      =  46,  /* Hitachi H8/300                                  */
   EM_H8_300H     =  47,  /* Hitachi H8/300H                                 */
   EM_H8S         =  48,  /* Hitachi H8S                                     */
   EM_H8_500      =  49,  /* Hitachi H8/500                                  */
   EM_IA_64       =  50,  /* Intel IA-64 processor architecture              */
   EM_MIPS_X      =  51,  /* Stanford MIPS-X                                 */
   EM_COLDFIRE    =  52,  /* Motorola ColdFire                               */
   EM_68HC12      =  53,  /* Motorola M68HC12                                */
   EM_MMA         =  54,  /* Fujitsu MMA Multimedia Accelerator              */
   EM_PCP         =  55,  /* Siemens PCP                                     */
   EM_NCPU        =  56,  /* Sony nCPU embedded RISC processor               */
   EM_NDR1        =  57,  /* Denso NDR1 microprocessor                       */
   EM_STARCORE    =  58,  /* Motorola Star*Core processor                    */
   EM_ME16        =  59,  /* Toyota ME16 processor                           */
   EM_ST100       =  60,  /* STMicroelectronics ST100 processor              */
   EM_TINYJ       =  61,  /* Advanced Logic Corp. TinyJ embedded processor f */
   EM_X86_64      =  62,  /* AMD x86-64 architecture                         */
   EM_PDSP        =  63,  /* Sony DSP Processor                              */
   EM_PDP10       =  64,  /* Digital Equipment Corp. PDP-10                  */
   EM_PDP11       =  65,  /* Digital Equipment Corp. PDP-11                  */
   EM_FX66        =  66,  /* Siemens FX66 microcontroller                    */
   EM_ST9PLUS     =  67,  /* STMicroelectronics ST9+ 8/16 bit microcontrolle */
   EM_ST7         =  68,  /* STMicroelectronics ST7 8-bit microcontroller    */
   EM_68HC16      =  69,  /* Motorola MC68HC16 Microcontroller               */
   EM_68HC11      =  70,  /* Motorola MC68HC11 Microcontroller               */
   EM_68HC08      =  71,  /* Motorola MC68HC08 Microcontroller               */
   EM_68HC05      =  72,  /* Motorola MC68HC05 Microcontroller               */
   EM_SVX         =  73,  /* Silicon Graphics SVx                            */
   EM_ST19        =  74,  /* STMicroelectronics ST19 8-bit microcontroller   */
   EM_VAX         =  75,  /* Digital VAX                                     */
   EM_CRIS        =  76,  /* Axis Communications 32-bit embedded processor   */
   EM_JAVELIN     =  77,  /* Infineon Technologies 32-bit embedded processor */
   EM_FIREPATH    =  78,  /* Element 14 64-bit DSP Processor                 */
   EM_ZSP         =  79,  /* LSI Logic 16-bit DSP Processor                  */
   EM_MMIX        =  80,  /* Donald Knuth's educational 64-bit processor     */
   EM_HUANY       =  81,  /* Harvard University machine-independent object f */
   EM_PRISM       =  82,  /* SiTera Prism                                    */
   EM_AVR         =  83,  /* Atmel AVR 8-bit microcontroller                 */
   EM_FR30        =  84,  /* Fujitsu FR30                                    */
   EM_D10V        =  85,  /* Mitsubishi D10V                                 */
   EM_D30V        =  86,  /* Mitsubishi D30V                                 */
   EM_V850        =  87,  /* NEC v850                                        */
   EM_M32R        =  88,  /* Mitsubishi M32R                                 */
   EM_MN10300     =  89,  /* Matsushita MN10300                              */
   EM_MN10200     =  90,  /* Matsushita MN10200                              */
   EM_PJ          =  91,  /* picoJava                                        */
   EM_OPENRISC    =  92,  /* OpenRISC 32-bit embedded processor              */
   EM_ARC_A5      =  93,  /* ARC Cores Tangent-A5                            */
   EM_XTENSA      =  94,  /* Tensilica Xtensa Architecture                   */
   EM_VIDEOCORE   =  95,  /* Alphamosaic VideoCore processor                 */
   EM_TMM_GPP     =  96,  /* Thompson Multimedia General Purpose Processor   */
   EM_NS32K       =  97,  /* National Semiconductor 32000 series             */
   EM_TPC         =  98,  /* Tenor Network TPC processor                     */
   EM_SNP1K       =  99,  /* Trebia SNP 1000 processor                       */
   EM_ST200       = 100,  /* STMicroelectronics (www.st.com) ST200 microcont */
   EM_IP2K        = 101,  /* Ubicom IP2xxx microcontroller family            */
   EM_MAX         = 102,  /* MAX Processor                                   */
   EM_CR          = 103,  /* National Semiconductor CompactRISC microprocess */
   EM_F2MC16      = 104,  /* Fujitsu F2MC16                                  */
   EM_MSP430      = 105,  /* Texas Instruments embedded microcontroller msp4 */
   EM_BLACKFIN    = 106,  /* Analog Devices Blackfin (DSP) processor         */
   EM_SE_C33      = 107,  /* S1C33 Family of Seiko Epson processors          */
   EM_SEP         = 108,  /* Sharp embedded microprocessor                   */
   EM_ARCA        = 109,  /* Arca RISC Microprocessor                        */
   EM_UNICORE     = 110,  /* Microprocessor series from PKU-Unity Ltd. and M */

   /*------------------------------------------------------------------------*/
   /* ELF Magic Numbers Reserved For Texas Instruments                       */
   /*                                                                        */
   /*   The magic numbers 140-159 were reserved through SCO to be included   */
   /*   in the official ELF specification.  Please see Don Darling           */
   /*   regarding any changes or allocation of the numbers below.            */
   /*                                                                        */
   /*   When we allocate a number for use, SCO needs to be notified so they  */
   /*   can update the ELF specification accordingly.                        */
   /*------------------------------------------------------------------------*/
   EM_TI_C6000    = 140,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED02 = 141,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED03 = 142,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED04 = 143,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED05 = 144,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED06 = 145,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED07 = 146,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED08 = 147,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED09 = 148,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED10 = 149,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED11 = 150,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED12 = 151,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED13 = 152,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED14 = 153,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED15 = 154,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED16 = 155,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED17 = 156,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED18 = 157,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED19 = 158,  /* Reserved for Texas Instruments; unused          */
   EM_TI_UNUSED20 = 159   /* Reserved for Texas Instruments; unused          */
};


/*---------------------------------------------------------------------------*/
/* Object File Version (value of "e_version")                                */
/*---------------------------------------------------------------------------*/
enum
{
   EV_NONE    = 0,  /* Invalid version */
   EV_CURRENT = 1   /* Current version */
};


/*****************************************************************************/
/* ELF Identification                                                        */
/* PP. 1-6                                                                   */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Identification Values for ELF Files                                       */
/*---------------------------------------------------------------------------*/

/* EI_MAG0 to EI_MAG3 */
enum
{
   ELFMAG0 = 0x7f,  /* e_ident[EI_MAG0] */
   ELFMAG1 = 'E',   /* e_ident[EI_MAG1] */
   ELFMAG2 = 'L',   /* e_ident[EI_MAG2] */
   ELFMAG3 = 'F'    /* e_ident[EI_MAG3] */
};

/* EI_CLASS */
enum
{
   ELFCLASSNONE = 0,  /* Invalid class  */
   ELFCLASS32   = 1,  /* 32-bit objects */
   ELFCLASS64   = 2   /* 64-bit objects */
};

/* EI_DATA */
enum
{
   ELFDATANONE = 0,  /* Invalid data encoding */
   ELFDATA2LSB = 1,  /* Little-endian data    */
   ELFDATA2MSB = 2   /* Big-endian data       */
};

/* EI_OSABI */
enum
{
   ELFOSABI_NONE       = 0,   /* No extensions or unspecified       */
   ELFOSABI_HPUX       = 1,   /* Hewlett-Packard HP-UX              */
   ELFOSABI_NETBSD     = 2,   /* NetBSD                             */
   ELFOSABI_LINUX      = 3,   /* Linux                              */
   ELFOSABI_SOLARIS    = 6,   /* Sun Solaris                        */
   ELFOSABI_AIX        = 7,   /* AIX                                */
   ELFOSABI_IRIX       = 8,   /* IRIX                               */
   ELFOSABI_FREEBSD    = 9,   /* FreeBSD                            */
   ELFOSABI_TRU64      = 10,  /* Compaq TRU64 UNIX                  */
   ELFOSABI_MODESTO    = 11,  /* Novell Modesto                     */
   ELFOSABI_OPENBSD    = 12,  /* Open BSD                           */
   ELFOSABI_OPENVMS    = 13,  /* Open VMS                           */
   ELFOSABI_NSK        = 14,  /* Hewlett-Packard Non-Stop Kernel    */
   ELFOSABI_AROS       = 15   /* Amiga Research OS                  */
};

/*****************************************************************************/
/* Program Header                                                            */
/* PP. 2-2                                                                   */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Program Header Data Structure                                             */
/*---------------------------------------------------------------------------*/
struct Elf32_Phdr
{
   Elf32_Word  p_type;    /* Segment type              */
   Elf32_Off   p_offset;  /* Segment file offset       */
   Elf32_Addr  p_vaddr;   /* Segment virtual address   */
   Elf32_Addr  p_paddr;   /* Segment physical address  */
   Elf32_Word  p_filesz;  /* Segment file image size   */
   Elf32_Word  p_memsz;   /* Segment memory image size */
   Elf32_Word  p_flags;   /* Segment flags             */
   Elf32_Word  p_align;   /* Segment alignment         */
};

/*---------------------------------------------------------------------------*/
/* Segment Types (value of "p_type")                                         */
/*---------------------------------------------------------------------------*/
enum
{
   PT_NULL    = 0,           /* Unused table entry                           */
   PT_LOAD    = 1,           /* Loadable segment                             */
   PT_DYNAMIC = 2,           /* Dynamic linking information                  */
   PT_INTERP  = 3,           /* Interpreter path string location             */
   PT_NOTE    = 4,           /* Location and size of auxiliary information   */
   PT_SHLIB   = 5,           /* Shared library information                   */
   PT_PHDR    = 6,           /* Location and size of program header table    */
   PT_TLS     = 7,           /* Specifies the Thread-Local Storage template  */
   PT_LOOS    = 0x60000000,  /* First OS-specific value                      */
   PT_HIOS    = 0x6fffffff,  /* Last  OS-specific value                      */
   PT_LOPROC  = 0x70000000,  /* First processor-specific value               */
   PT_HIPROC  = 0x7fffffff   /* Last  processor-specific value               */
};

/*---------------------------------------------------------------------------*/
/* Segment Permissions (value of "p_flags")                                  */
/*---------------------------------------------------------------------------*/
enum
{
   PF_X        = 0x1,         /* Execute                 */
   PF_W        = 0x2,         /* Write                   */
   PF_R        = 0x4,         /* Read                    */
   PF_MASKOS   = 0x0ff00000,  /* OS-specific mask        */
   PF_MASKPROC = 0xf0000000   /* Processor-specific mask */
};

/*****************************************************************************/
/* Sections                                                                  */
/* PP. 1-9                                                                   */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Section Header Data Structure                                             */
/*---------------------------------------------------------------------------*/
struct Elf32_Shdr
{
   Elf32_Word  sh_name;       /* Section name (offset into string section)   */
   Elf32_Word  sh_type;       /* Section type                                */
   Elf32_Word  sh_flags;      /* Section flags                               */
   Elf32_Addr  sh_addr;       /* Address in memory image                     */
   Elf32_Off   sh_offset;     /* File offset of section data                 */
   Elf32_Word  sh_size;       /* Size of the section in bytes                */
   Elf32_Word  sh_link;       /* Link to the section header table            */
   Elf32_Word  sh_info;       /* Extra information depending on section type */
   Elf32_Word  sh_addralign;  /* Address alignment constraints               */
   Elf32_Word  sh_entsize;    /* Size of fixed-size entries in section       */
};

/*---------------------------------------------------------------------------*/
/* Special Section Indexes                                                   */
/*---------------------------------------------------------------------------*/
enum
{
   SHN_UNDEF     = 0,       /* Referenced by undefined values          */
   SHN_LORESERVE = 0xff00,  /* First reserved index                    */
   SHN_LOPROC    = 0xff00,  /* First processor-specific index          */
   SHN_HIPROC    = 0xff1f,  /* Last  processor-specific index          */
   SHN_LOOS      = 0xff20,  /* First OS-specific index                 */
   SHN_HIOS      = 0xff3f,  /* Last  OS-specific index                 */
   SHN_ABS       = 0xfff1,  /* Referenced by absolute values           */
   SHN_COMMON    = 0xfff2,  /* Referenced by common values             */
   SHN_XINDEX    = 0xffff,  /* Indirect index reference (escape value) */
   SHN_HIRESERVE = 0xffff   /* Last reserved index                     */
};

/*---------------------------------------------------------------------------*/
/* Section Types (value of "sh_type")                                        */
/*---------------------------------------------------------------------------*/
enum
{
   SHT_NULL          = 0,           /* Inactive section                      */
   SHT_PROGBITS      = 1,           /* Application-specific information      */
   SHT_SYMTAB        = 2,           /* Symbol table                          */
   SHT_STRTAB        = 3,           /* String table                          */
   SHT_RELA          = 4,           /* Relocation entries (explicit addends) */
   SHT_HASH          = 5,           /* Symbol hash table                     */
   SHT_DYNAMIC       = 6,           /* Dynamic linking information           */
   SHT_NOTE          = 7,           /* Miscellaneous information             */
   SHT_NOBITS        = 8,           /* Contains no data in file              */
   SHT_REL           = 9,           /* Relocation entries (no expl. addends) */
   SHT_SHLIB         = 10,          /* Shared library                        */
   SHT_DYNSYM        = 11,          /* Dynamic symbol table                  */
   SHT_INIT_ARRAY    = 14,          /* Pointers to initialization functions  */
   SHT_FINI_ARRAY    = 15,          /* Pointers to termination functions     */
   SHT_PREINIT_ARRAY = 16,          /* Pointers to pre-init functions        */
   SHT_GROUP         = 17,          /* Section group                         */
   SHT_SYMTAB_SHNDX  = 18,          /* Section indexes for SHN_XINDEX refs.  */
   SHT_LOOS          = 0x60000000,  /* First OS-specific type                */
   SHT_HIOS          = 0x6fffffff,  /* Last  OS-specific type                */
   SHT_LOPROC        = 0x70000000,  /* First processor-specific type         */
   SHT_HIPROC        = 0x7fffffff,  /* Last  processor-specific type         */
   SHT_LOUSER        = 0x80000000,  /* First application-specific type       */
   SHT_HIUSER        = 0xffffffff   /* Last  application-specific type       */
};

/*---------------------------------------------------------------------------*/
/* Section Attribute Flags (value of "sh_flags")                             */
/*---------------------------------------------------------------------------*/
enum
{
   SHF_WRITE            = 0x1,         /* Writable during process execution  */
   SHF_ALLOC            = 0x2,         /* Loaded into processor memory       */
   SHF_EXECINSTR        = 0x4,         /* Contains executable instructions   */
   SHF_MERGE            = 0x10,        /* Can be merged                      */
   SHF_STRINGS          = 0x20,        /* Contains null-terminated strings   */
   SHF_INFO_LINK        = 0x40,        /* sh_info contains a section index   */
   SHF_LINK_ORDER       = 0x80,        /* Maintain section ordering          */
   SHF_OS_NONCONFORMING = 0x100,       /* OS-specific processing required    */
   SHF_GROUP            = 0x200,       /* Member of a section group          */
   SHF_TLS              = 0x400,       /* Contains Thread-Local Storage      */
   SHF_MASKOS           = 0x0ff00000,  /* Mask of OS-specific flags          */
   SHF_MASKPROC         = 0xf0000000   /* Mask for processor-specific flags  */
};

/*---------------------------------------------------------------------------*/
/* Section Group Flags                                                       */
/*---------------------------------------------------------------------------*/
enum
{
   GRP_COMDAT   = 0x1,         /* Common data; only one is kept by linker */
   GRP_MASKOS   = 0x0ff00000,  /* Mask for OS-specific group flags        */
   GRP_MASKPROC = 0xf0000000   /* Mask for processor-specific group flags */
};


/*****************************************************************************/
/* Symbol Table                                                              */
/* PP. 1-18                                                                  */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Symbol Table Entry Data Structure                                         */
/*---------------------------------------------------------------------------*/
struct Elf32_Sym
{
   Elf32_Word  st_name;   /* String table offset for symbol name */
   Elf32_Addr  st_value;  /* Symbol value                        */
   Elf32_Word  st_size;   /* Symbol size                         */
   uint8_t     st_info;   /* Symbol type and binding             */
   uint8_t     st_other;  /* Symbol visibility                   */
   Elf32_Half  st_shndx;  /* Symbol type / defining section      */
};

/*---------------------------------------------------------------------------*/
/* Undefined Symbol Index                                                    */
/*---------------------------------------------------------------------------*/
enum
{
   STN_UNDEF = 0   /* First symbol table entry is always undefined */
};

/*---------------------------------------------------------------------------*/
/* Symbol Binding and Type Utility Functions.                                */
/*---------------------------------------------------------------------------*/
static inline uint8_t ELF32_ST_BIND(uint8_t i)       { return (i >> 4);      }
static inline uint8_t ELF32_ST_TYPE(uint8_t i)       { return (i & 0xf);     }
static inline uint8_t ELF32_ST_INFO(uint8_t b, uint8_t t) 
                                            { return ((b << 4) + (t & 0xf)); }
static inline uint8_t ELF32_ST_VISIBILITY(uint8_t o) { return (o & 0x3);     }


/*---------------------------------------------------------------------------*/
/* Symbol Binding (value returned by ELF32_ST_BIND())                        */
/*---------------------------------------------------------------------------*/
enum
{
   STB_LOCAL  = 0,   /* Symbol does not have external linkage */
   STB_GLOBAL = 1,   /* Symbol has external linkage           */
   STB_WEAK   = 2,   /* Symbol has weak external linkage      */
   STB_LOOS   = 10,  /* First OS-specific binding             */
   STB_HIOS   = 12,  /* Last  OS-specific binding             */
   STB_LOPROC = 13,  /* First processor-specific binding      */
   STB_HIPROC = 15   /* Last  processor-specific binding      */
};

/*---------------------------------------------------------------------------*/
/* Symbol Types (value returned by ELF32_ST_TYPE())                          */
/*---------------------------------------------------------------------------*/
enum
{
   STT_NOTYPE  = 0,   /* Unspecified type                        */
   STT_OBJECT  = 1,   /* Associated with a data object           */
   STT_FUNC    = 2,   /* Associated with executable code         */
   STT_SECTION = 3,   /* Associated with a section               */
   STT_FILE    = 4,   /* Associated with a source file           */
   STT_COMMON  = 5,   /* Labels an uninitialized common block    */
   STT_TLS     = 6,   /* Specifies a thread-local storage entity */
   STT_LOOS    = 10,  /* First OS-specific type                  */
   STT_HIOS    = 12,  /* Last  OS-specific type                  */
   STT_LOPROC  = 13,  /* First processor-specific type           */
   STT_HIPROC  = 15   /* Last  processor-specific type           */
};

/*---------------------------------------------------------------------------*/
/* Symbol Visibility (value returned by ELF32_ST_VISIBILITY())               */
/*---------------------------------------------------------------------------*/
enum
{
   STV_DEFAULT   = 0,  /* Visibility specified by binding type               */
   STV_INTERNAL  = 1,  /* Like STV_HIDDEN, with processor-specific semantics */
   STV_HIDDEN    = 2,  /* Not visible to other components                    */
   STV_PROTECTED = 3   /* Visible in other components but not preemptable    */
};

/*****************************************************************************/
/* Relocation                                                                */
/* PP. 1-22                                                                  */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Relocation Entries Data Structures                                        */
/*---------------------------------------------------------------------------*/
struct Elf32_Rel
{
   Elf32_Addr  r_offset;  /* Offset of the relocatable value in the section */
   Elf32_Word  r_info;    /* Symbol table index and relocation type         */
};

struct Elf32_Rela
{
   Elf32_Addr  r_offset;  /* Offset of the relocatable value in the section */
   Elf32_Word  r_info;    /* Symbol table index and relocation type         */
   Elf32_Sword r_addend;  /* Constant addend used to compute new value      */
};

/*---------------------------------------------------------------------------*/
/* Relocation Symbol and Type Utility Functions.                             */
/*---------------------------------------------------------------------------*/
static inline uint32_t ELF32_R_SYM(uint32_t i)  { return (i >> 8);            }
static inline uint8_t  ELF32_R_TYPE(uint32_t i) { return (i & 0xFF);          }
static inline uint32_t ELF32_R_INFO(uint32_t s, uint8_t t) 
                                                { return ((s << 8) + t);      }


/*****************************************************************************/
/* Dynamic Section                                                           */
/* PP. 2-8                                                                   */
/*****************************************************************************/
struct Elf32_Dyn
{
   Elf32_Sword  d_tag;
   union
   {
      Elf32_Word  d_val;
      Elf32_Addr  d_ptr;
   } d_un;
};

/* Name                 Value           d_un        Executable  Shared Obj. */
/* ----                 -----           ----        ----------  ----------- */
enum
{
   DT_NULL            = 0,           /* ignored     mandatory   mandatory   */
   DT_NEEDED          = 1,           /* d_val       optional    optional    */
   DT_PLTRELSZ        = 2,           /* d_val       optional    optional    */
   DT_PLTGOT          = 3,           /* d_ptr       optional    optional    */
   DT_HASH            = 4,           /* d_ptr       mandatory   mandatory   */
   DT_STRTAB          = 5,           /* d_ptr       mandatory   mandatory   */
   DT_SYMTAB          = 6,           /* d_ptr       mandatory   mandatory   */
   DT_RELA            = 7,           /* d_ptr       mandatory   optional    */
   DT_RELASZ          = 8,           /* d_val       mandatory   optional    */
   DT_RELAENT         = 9,           /* d_val       mandatory   optional    */
   DT_STRSZ           = 10,          /* d_val       mandatory   mandatory   */
   DT_SYMENT          = 11,          /* d_val       mandatory   mandatory   */
   DT_INIT            = 12,          /* d_ptr       optional    optional    */
   DT_FINI            = 13,          /* d_ptr       optional    optional    */
   DT_SONAME          = 14,          /* d_val       ignored     optional    */
   DT_RPATH           = 15,          /* d_val       optional    ignored     */
   DT_SYMBOLIC        = 16,          /* ignored     ignored     optional    */
   DT_REL             = 17,          /* d_ptr       mandatory   optional    */
   DT_RELSZ           = 18,          /* d_val       mandatory   optional    */
   DT_RELENT          = 19,          /* d_val       mandatory   optional    */
   DT_PLTREL          = 20,          /* d_val       optional    optional    */
   DT_DEBUG           = 21,          /* d_ptr       optional    ignored     */
   DT_TEXTREL         = 22,          /* ignored     optional    optional    */
   DT_JMPREL          = 23,          /* d_ptr       optional    optional    */
   DT_BIND_NOW        = 24,          /* ignored     optional    optional    */
   DT_INIT_ARRAY      = 25,          /* d_ptr       optional    optional    */
   DT_FINI_ARRAY      = 26,          /* d_ptr       optional    optional    */
   DT_INIT_ARRAYSZ    = 27,          /* d_val       optional    optional    */
   DT_FINI_ARRAYSZ    = 28,          /* d_val       optional    optional    */
   DT_RUNPATH         = 29,          /* d_val       optional    optional    */
   DT_FLAGS           = 30,          /* d_val       optional    optional    */
   DT_ENCODING        = 32,          /* unspecified unspecified unspecified */
   DT_PREINIT_ARRAY   = 32,          /* d_ptr       optional    ignored     */
   DT_PREINIT_ARRAYSZ = 33,          /* d_val       optional    ignored     */
   DT_LOOS            = 0x60000000,  /* unspecified unspecified unspecified */
   DT_HIOS            = 0x6ffff000,  /* unspecified unspecified unspecified */
   DT_LOPROC          = 0x70000000,  /* unspecified unspecified unspecified */
   DT_HIPROC          = 0x7fffffff   /* unspecified unspecified unspecified */
}; 


/*---------------------------------------------------------------------------*/
/* DT_FLAGS values.                                                          */
/*---------------------------------------------------------------------------*/
enum
{
  DF_ORIGIN     = 0x01, /* loaded object may reference $ORIGIN subst. string */
  DF_SYMBOLIC   = 0x02, /* changes dynamic linker symbol resolution          */
  DF_TEXTREL    = 0x04, /* do not allow relocation of non-writable segments  */
  DF_BIND_NOW   = 0x08, /* don't use lazy binding                            */
  DF_STATIC_TLS = 0x10, /* do not load this file dynamically                 */
  DF_DIRECT_DEPENDENT = 0x20, /* limit global sym lookup to dependent list   */
  DF_WORLD      = 0x40  /* Linux style global sym lookup, breadth-first      */
};


/*---------------------------------------------------------------------------*/
/* Dynamic Tag Database.                                                     */
/*---------------------------------------------------------------------------*/

/* Specifiers for which d_un union member to use                             */

enum
{
   EDYN_UNTYPE_IGNORED,
   EDYN_UNTYPE_VAL,
   EDYN_UNTYPE_PTR,
   EDYN_UNTYPE_UNSPECIFIED
};


/* Specifiers for executable/shared object file requirements                 */

enum
{
   EDYN_TAGREQ_IGNORED,
   EDYN_TAGREQ_MANDATORY,
   EDYN_TAGREQ_OPTIONAL,
   EDYN_TAGREQ_UNSPECIFIED
};


/* Data structure for one dynamic tag database entry                         */

struct EDYN_TAG
{
   const char* d_tag_name;   /* tag name string                     */
   Elf32_Sword d_tag_value;  /* DT_* tag value                      */
   Elf32_Word  d_untype;     /* which d_un union member to use      */
   Elf32_Word  d_exec_req;   /* requirement for executable files    */
   Elf32_Word  d_shared_req; /* requirement for shared object files */
};

extern const struct EDYN_TAG EDYN_TAG_DB[];

/*****************************************************************************/
/* Special Section Database                                                  */
/*****************************************************************************/

/*---------------------------------------------------------------------------*/
/* Special Section Names                                                     */
/*---------------------------------------------------------------------------*/
#define ESCN_BSS_name            ".bss"
#define ESCN_COMMENT_name        ".comment"
#define ESCN_DATA1_name          ".data1"
#define ESCN_DATA_name           ".data"
#define ESCN_DEBUG_name          ".debug"
#define ESCN_DYNAMIC_name        ".dynamic"
#define ESCN_DYNSTR_name         ".dynstr"
#define ESCN_DYNSYM_name         ".dynsym"
#define ESCN_FINI_ARRAY_name     ".fini_array"
#define ESCN_FINI_name           ".fini"
#define ESCN_GOT_name            ".got"
#define ESCN_HASH_name           ".hash"
#define ESCN_INIT_ARRAY_name     ".init_array"
#define ESCN_INIT_name           ".init"
#define ESCN_INTERP_name         ".interp"
#define ESCN_LINE_name           ".line"
#define ESCN_NOTE_name           ".note"
#define ESCN_PLT_name            ".plt"
#define ESCN_PREINIT_ARRAY_name  ".preinit_array"
#define ESCN_RELA_name           ".rela"
#define ESCN_REL_name            ".rel"
#define ESCN_RODATA1_name        ".rodata1"
#define ESCN_RODATA_name         ".rodata"
#define ESCN_SHSTRTAB_name       ".shstrtab"
#define ESCN_STRTAB_name         ".strtab"
#define ESCN_SYMTAB_SHNDX_name   ".symtab_shndx"
#define ESCN_SYMTAB_name         ".symtab"
#define ESCN_TBSS_name           ".tbss"
#define ESCN_TDATA1_name         ".tdata1"
#define ESCN_TDATA_name          ".tdata"
#define ESCN_TEXT_name           ".text"
#define ESCN_ATTRIBUTES_name     "__TI_build_attributes"
#define ESCN_ICODE_name          "__TI_ICODE"
#define ESCN_XREF_name           "__TI_XREF"

/*---------------------------------------------------------------------------*/
/* Special Section Information Data Structure.                               */
/*---------------------------------------------------------------------------*/
struct ESCN
{
   const char *name;
   Elf32_Word  sh_type;
   Elf32_Word  sh_entsize;
   Elf32_Word  sh_flags;
};

extern const struct ESCN ESCN_DB[];

#endif /* ELF32_H */
