elf.h

/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
 *      The President and Fellows of Harvard College.
 *
 * 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. Neither the name of the University 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 UNIVERSITY 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 UNIVERSITY 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 _ELF_H_
#define _ELF_H_


/*
 * Simplified ELF definitions for OS/161 and System/161.
 *
 * Restrictions:
 *     32-bit only
 *     No support for .o files or linker structures
 *     Does not define all the random symbols a standard elf header would.
 */

/* Get MD bits */
#include <machine/elf.h>


/*
 * ELF file header. This appears at the very beginning of an ELF file.
 */
#define ELF_NIDENT      16
typedef struct {
        unsigned char   e_ident[ELF_NIDENT];   /* magic number et al. */
        uint16_t        e_type;                /* type of file this is */
        uint16_t        e_machine;             /* processor type file is for */
        uint32_t        e_version;             /* ELF version */
        uint32_t        e_entry;           /* address of program entry point */
        uint32_t        e_phoff;           /* location in file of phdrs */
        uint32_t        e_shoff;           /* ignore */
        uint32_t        e_flags;           /* ignore */
        uint16_t        e_ehsize;          /* actual size of file header */
        uint16_t        e_phentsize;       /* actual size of phdr */
        uint16_t        e_phnum;           /* number of phdrs */
        uint16_t        e_shentsize;       /* ignore */
        uint16_t        e_shnum;           /* ignore */
        uint16_t        e_shstrndx;        /* ignore */
} Elf32_Ehdr;

/* Offsets for the 1-byte fields within e_ident[] */
#define EI_MAG0         0       /* '\177' */
#define EI_MAG1         1       /* 'E'    */
#define EI_MAG2         2       /* 'L'    */
#define EI_MAG3         3       /* 'F'    */
#define EI_CLASS        4       /* File class - always ELFCLASS32 */
#define EI_DATA         5       /* Data encoding - ELFDATA2LSB or ELFDATA2MSB*/
#define EI_VERSION      6       /* ELF version - EV_CURRENT*/
#define EI_OSABI        7       /* OS/syscall ABI identification */
#define EI_ABIVERSION   8       /* syscall ABI version */
#define EI_PAD          9       /* Start of padding bytes up to EI_NIDENT*/

/* Values for these fields */

/* For e_ident[EI_MAG0..3] */
#define ELFMAG0         0x7f
#define ELFMAG1         'E'
#define ELFMAG2         'L'
#define ELFMAG3         'F'

/* For e_ident[EI_CLASS] */
#define ELFCLASSNONE    0       /* Invalid class */
#define ELFCLASS32      1       /* 32-bit objects */
#define ELFCLASS64      2       /* 64-bit objects */

/* e_ident[EI_DATA] */
#define ELFDATANONE     0       /* Invalid data encoding */
#define ELFDATA2LSB     1       /* 2's complement values, LSB first */
#define ELFDATA2MSB     2       /* 2's complement values, MSB first */

/* e_ident[EI_VERSION] */
#define EV_NONE         0       /* Invalid version */
#define EV_CURRENT      1       /* Current version */

/* e_ident[EI_OSABI] */
#define ELFOSABI_SYSV           0       /* UNIX System V ABI */
#define ELFOSABI_HPUX           1       /* HP-UX operating system */
#define ELFOSABI_STANDALONE     255     /* Standalone (embedded) application */


/*
 * Values for 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

/*
 * Values for 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 */
#define EM_860          7       /* Intel 80860 */
#define EM_MIPS         8       /* MIPS I Architecture */
#define EM_S370         9       /* Amdahl UTS on System/370 */
#define EM_MIPS_RS3_LE  10      /* MIPS RS3000 Little-endian */
#define EM_RS6000       11      /* IBM RS/6000 XXX reserved */
#define EM_PARISC       15      /* Hewlett-Packard PA-RISC */
#define EM_NCUBE        16      /* NCube XXX reserved */
#define EM_VPP500       17      /* Fujitsu VPP500 */
#define EM_SPARC32PLUS  18      /* Enhanced instruction set SPARC */
#define EM_960          19      /* Intel 80960 */
#define EM_PPC          20      /* PowerPC */
#define EM_V800         36      /* NEC V800 */
#define EM_FR20         37      /* Fujitsu FR20 */
#define EM_RH32         38      /* TRW RH-32 */
#define EM_RCE          39      /* Motorola RCE */
#define EM_ARM          40      /* Advanced RISC Machines ARM */
#define EM_ALPHA        41      /* DIGITAL Alpha */
#define EM_SH           42      /* Hitachi Super-H */
#define EM_SPARCV9      43      /* SPARC Version 9 */
#define EM_TRICORE      44      /* Siemens Tricore */
#define EM_ARC          45      /* Argonaut RISC Core */
#define EM_H8_300       46      /* Hitachi H8/300 */
#define EM_H8_300H      47      /* Hitachi H8/300H */
#define EM_H8S          48      /* Hitachi H8S */
#define EM_H8_500       49      /* Hitachi H8/500 */
#define EM_IA_64        50      /* Intel Merced Processor */
#define EM_MIPS_X       51      /* Stanford MIPS-X */
#define EM_COLDFIRE     52      /* Motorola Coldfire */
#define EM_68HC12       53      /* Motorola MC68HC12 */
#define EM_VAX          75      /* DIGITAL VAX */
#define EM_ALPHA_EXP    36902   /* used by NetBSD/alpha; obsolete */
#define EM_NUM          36903


/*
 * "Program Header" - runtime segment header.
 * There are Ehdr.e_phnum of these located at one position within the file.
 *
 * Note: if p_memsz > p_filesz, the leftover space should be zero-filled.
 */
typedef struct {
        uint32_t        p_type;      /* Type of segment */
        uint32_t        p_offset;    /* Location of data within file */
        uint32_t        p_vaddr;     /* Virtual address */
        uint32_t        p_paddr;     /* Ignore */
        uint32_t        p_filesz;    /* Size of data within file */
        uint32_t        p_memsz;     /* Size of data to be loaded into memory*/
        uint32_t        p_flags;     /* Flags */
        uint32_t        p_align;     /* Required alignment - can ignore */
} Elf32_Phdr;

/* values for p_type */
#define PT_NULL         0               /* Program header table entry unused */
#define PT_LOAD         1               /* Loadable program segment */
#define PT_DYNAMIC      2               /* Dynamic linking information */
#define PT_INTERP       3               /* Program interpreter */
#define PT_NOTE         4               /* Auxiliary information */
#define PT_SHLIB        5               /* Reserved, unspecified semantics */
#define PT_PHDR         6               /* Entry for header table itself */
#define PT_NUM          7
#define PT_MIPS_REGINFO 0x70000000

/* values for p_flags */
#define PF_R            0x4     /* Segment is readable */
#define PF_W            0x2     /* Segment is writable */
#define PF_X            0x1     /* Segment is executable */


typedef Elf32_Ehdr Elf_Ehdr;
typedef Elf32_Phdr Elf_Phdr;


#endif /* _ELF_H_ */