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elf_common.h

/*-
 * Copyright (c) 1998 John D. Polstra.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/sys/sys/elf_common.h,v 1.15 2004/05/05 02:38:54 marcel Exp $
 */

#ifndef ___k_kLdrFmts_elf_common_h___
#define ___k_kLdrFmts_elf_common_h___

/*
 * ELF definitions that are independent of architecture or word size.
 */

/*
 * Note header.  The ".note" section contains an array of notes.  Each
 * begins with this header, aligned to a word boundary.  Immediately
 * following the note header is n_namesz bytes of name, padded to the
 * next word boundary.  Then comes n_descsz bytes of descriptor, again
 * padded to a word boundary.  The values of n_namesz and n_descsz do
 * not include the padding.
 */

typedef struct {
      KU32  n_namesz;   /* Length of name. */
      KU32  n_descsz;   /* Length of descriptor. */
      KU32  n_type;           /* Type of this note. */
} Elf_Note;

/* Indexes into the e_ident array.  Keep synced with
   http://www.sco.com/developer/gabi/ch4.eheader.html */
#define EI_MAG0         0     /* Magic number, byte 0. */
#define EI_MAG1         1     /* Magic number, byte 1. */
#define EI_MAG2         2     /* Magic number, byte 2. */
#define EI_MAG3         3     /* Magic number, byte 3. */
#define EI_CLASS  4     /* Class of machine. */
#define EI_DATA         5     /* Data format. */
#define EI_VERSION      6     /* ELF format version. */
#define EI_OSABI  7     /* Operating system / ABI identification */
#define EI_ABIVERSION   8     /* ABI version */
#define OLD_EI_BRAND    8     /* Start of architecture identification. */
#define EI_PAD          9     /* Start of padding (per SVR4 ABI). */
#define EI_NIDENT 16    /* Size of e_ident array. */

/* Values for the magic number bytes. */
#define ELFMAG0         0x7f
#define ELFMAG1         'E'
#define ELFMAG2         'L'
#define ELFMAG3         'F'
#define ELFMAG          "\177ELF"   /* magic string */
#define SELFMAG         4           /* magic string size */

/* Values for e_ident[EI_VERSION] and e_version. */
#define EV_NONE         0
#define EV_CURRENT      1

/* Values for e_ident[EI_CLASS]. */
#define ELFCLASSNONE    0     /* Unknown class. */
#define ELFCLASS32      1     /* 32-bit architecture. */
#define ELFCLASS64      2     /* 64-bit architecture. */

/* Values for e_ident[EI_DATA]. */
#define ELFDATANONE     0     /* Unknown data format. */
#define ELFDATA2LSB     1     /* 2's complement little-endian. */
#define ELFDATA2MSB     2     /* 2's complement big-endian. */

/* Values for e_ident[EI_OSABI]. */
#define ELFOSABI_SYSV         0     /* UNIX System V ABI */
#define ELFOSABI_NONE         ELFOSABI_SYSV     /* symbol used in old spec */
#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)

/* Values for e_type. */
#define ET_NONE         0     /* Unknown type. */
#define ET_REL          1     /* Relocatable. */
#define ET_EXEC         2     /* Executable. */
#define ET_DYN          3     /* Shared object. */
#define ET_CORE         4     /* Core file. */

/* Values for e_machine. */
#define EM_NONE         0     /* Unknown machine. */
#define EM_M32          1     /* AT&T WE32100. */
#define EM_SPARC  2     /* Sun SPARC. */
#define EM_386          3     /* Intel i386. */
#define EM_68K          4     /* Motorola 68000. */
#define EM_88K          5     /* Motorola 88000. */
#define EM_486          6     /* Intel i486. */
#define EM_860          7     /* Intel i860. */
#define EM_MIPS         8     /* MIPS R3000 Big-Endian only */

/* Extensions.  This list is not complete. */
#define EM_S370         9     /* IBM System/370 */
#define EM_MIPS_RS4_BE  10    /* MIPS R4000 Big-Endian */ /* Depreciated */
#define EM_PARISC 15    /* HPPA */
#define EM_SPARC32PLUS  18    /* SPARC v8plus */
#define EM_PPC          20    /* PowerPC 32-bit */
#define EM_PPC64  21    /* PowerPC 64-bit */
#define EM_ARM          40    /* ARM */
#define EM_SPARCV9      43    /* SPARC v9 64-bit */
#define EM_IA_64  50    /* Intel IA-64 Processor */
#define EM_X86_64 62    /* Advanced Micro Devices x86-64 */
#define EM_ALPHA  0x9026      /* Alpha (written in the absence of an ABI */

/* Special section indexes. */
#define SHN_UNDEF      0            /* Undefined, missing, irrelevant. */
#define SHN_LORESERVE   0xff00            /* First of reserved range. */
#define SHN_LOPROC      0xff00            /* First processor-specific. */
#define SHN_HIPROC      0xff1f            /* Last processor-specific. */
#define SHN_ABS         0xfff1            /* Absolute values. */
#define SHN_COMMON      0xfff2            /* Common data. */
#define SHN_HIRESERVE   0xffff            /* Last of reserved range. */

/* 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           /* relocation section - no 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_LOOS  0x60000000  /* First of OS specific semantics */
#define SHT_HIOS  0x6fffffff  /* Last of OS specific semantics */
#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 */

/* Flags for sh_flags. */
#define SHF_WRITE 0x1         /* Section contains writable data. */
#define SHF_ALLOC 0x2         /* Section occupies memory. */
#define SHF_EXECINSTR   0x4         /* Section contains instructions. */
#define SHF_TLS         0x400       /* Section contains TLS data. */
#define SHF_MASKPROC    0xf0000000  /* Reserved for processor-specific. */

/* Values for p_type. */
#define PT_NULL         0     /* Unused entry. */
#define PT_LOAD         1     /* Loadable segment. */
#define PT_DYNAMIC      2     /* Dynamic linking information segment. */
#define PT_INTERP 3     /* Pathname of interpreter. */
#define PT_NOTE         4     /* Auxiliary information. */
#define PT_SHLIB  5     /* Reserved (not used). */
#define PT_PHDR         6     /* Location of program header itself. */
#define     PT_TLS            7     /* Thread local storage segment */

#define PT_COUNT  8     /* Number of defined p_type values. */

#define     PT_LOOS           0x60000000  /* OS-specific */
#define     PT_HIOS           0x6fffffff  /* OS-specific */
#define PT_LOPROC 0x70000000  /* First processor-specific type. */
#define PT_HIPROC 0x7fffffff  /* Last processor-specific type. */

/* Values for p_flags. */
#define PF_X            0x1   /* Executable. */
#define PF_W            0x2   /* Writable. */
#define PF_R            0x4   /* Readable. */

/* Values for d_tag. */
#define DT_NULL         0     /* Terminating entry. */
#define DT_NEEDED 1     /* String table offset of a needed shared
                           library. */
#define DT_PLTRELSZ     2     /* Total size in bytes of PLT relocations. */
#define DT_PLTGOT 3     /* Processor-dependent address. */
#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 ElfNN_Rela relocations. */
#define DT_RELASZ 8     /* Total size of ElfNN_Rela relocations. */
#define DT_RELAENT      9     /* Size of each ElfNN_Rela relocation entry. */
#define DT_STRSZ  10    /* Size of string table. */
#define DT_SYMENT 11    /* Size of each symbol table entry. */
#define DT_INIT         12    /* Address of initialization function. */
#define DT_FINI         13    /* Address of finalization function. */
#define DT_SONAME 14    /* String table offset of shared object
                           name. */
#define DT_RPATH  15    /* String table offset of library path. [sup] */
#define DT_SYMBOLIC     16    /* Indicates "symbolic" linking. [sup] */
#define DT_REL          17    /* Address of ElfNN_Rel relocations. */
#define DT_RELSZ  18    /* Total size of ElfNN_Rel relocations. */
#define DT_RELENT 19    /* Size of each ElfNN_Rel relocation. */
#define DT_PLTREL 20    /* Type of relocation used for PLT. */
#define DT_DEBUG  21    /* Reserved (not used). */
#define DT_TEXTREL      22    /* Indicates there may be relocations in
                           non-writable segments. [sup] */
#define DT_JMPREL 23    /* Address of PLT relocations. */
#define     DT_BIND_NOW 24    /* [sup] */
#define     DT_INIT_ARRAY     25    /* Address of the array of pointers to
                           initialization functions */
#define     DT_FINI_ARRAY     26    /* Address of the array of pointers to
                           termination functions */
#define     DT_INIT_ARRAYSZ   27    /* Size in bytes of the array of
                           initialization functions. */
#define     DT_FINI_ARRAYSZ   28    /* Size in bytes of the array of
                           terminationfunctions. */
#define     DT_RUNPATH  29    /* String table offset of a null-terminated
                           library search path string. */
#define     DT_FLAGS    30    /* Object specific flag values. */
#define     DT_ENCODING 32    /* Values greater than or equal to DT_ENCODING
                           and less than DT_LOOS follow the rules for
                           the interpretation of the d_un union
                           as follows: even == 'd_ptr', even == 'd_val'
                           or none */
#define     DT_PREINIT_ARRAY 32     /* Address of the array of pointers to
                           pre-initialization functions. */
#define     DT_PREINIT_ARRAYSZ 33   /* Size in bytes of the array of
                           pre-initialization functions. */

#define     DT_COUNT    33    /* Number of defined d_tag values. */

#define     DT_LOOS           0x6000000d  /* First OS-specific */
#define     DT_HIOS           0x6fff0000  /* Last OS-specific */
#define     DT_LOPROC   0x70000000  /* First processor-specific type. */
#define     DT_HIPROC   0x7fffffff  /* Last processor-specific type. */

/* Values for DT_FLAGS */
#define     DF_ORIGIN   0x0001      /* Indicates that the object being loaded may
                           make reference to the $ORIGIN substitution
                           string */
#define     DF_SYMBOLIC 0x0002      /* Indicates "symbolic" linking. */
#define     DF_TEXTREL  0x0004      /* Indicates there may be relocations in
                           non-writable segments. */
#define     DF_BIND_NOW 0x0008      /* Indicates that the dynamic linker should
                           process all relocations for the object
                           containing this entry before transferring
                           control to the program. */
#define     DF_STATIC_TLS     0x0010      /* Indicates that the shared object or
                           executable contains code using a static
                           thread-local storage scheme. */

/* Values for n_type.  Used in core files. */
#define NT_PRSTATUS     1     /* Process status. */
#define NT_FPREGSET     2     /* Floating point registers. */
#define NT_PRPSINFO     3     /* Process state info. */

/* Symbol Binding - ELFNN_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_LOPROC      13    /* reserved range for processor */
#define STB_HIPROC      15    /*  specific symbol bindings */

/* Symbol type - ELFNN_ST_TYPE - st_info */
#define STT_NOTYPE      0     /* Unspecified type. */
#define STT_OBJECT      1     /* Data object. */
#define STT_FUNC  2     /* Function. */
#define STT_SECTION     3     /* Section. */
#define STT_FILE  4     /* Source file. */
#define STT_TLS         6     /* TLS object. */
#define STT_LOPROC      13    /* reserved range for processor */
#define STT_HIPROC      15    /*  specific symbol types */

/* Special symbol table indexes. */
#define STN_UNDEF 0     /* Undefined symbol index. */

#endif


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