nes-proj/core/loader/elf32.h

/*
 * Copyright (c) 2006, Swedish Institute of Computer Science
 * 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. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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

/*
 * ELF definitions common to all 32-bit architectures.
 */

#define EI_NIDENT 16

typedef unsigned long  elf32_word;
typedef   signed long  elf32_sword;
typedef unsigned short elf32_half;
typedef unsigned long  elf32_off;
typedef unsigned long  elf32_addr;

struct elf32_ehdr {
  unsigned char e_ident[EI_NIDENT];    /* ident bytes */
  elf32_half e_type;                   /* file type */ 
  elf32_half e_machine;                /* target machine */
  elf32_word e_version;                /* file version */
  elf32_addr e_entry;                  /* start address */
  elf32_off e_phoff;                   /* phdr file offset */
  elf32_off e_shoff;                   /* shdr file offset */
  elf32_word e_flags;                  /* file flags */
  elf32_half e_ehsize;                 /* sizeof ehdr */
  elf32_half e_phentsize;              /* sizeof phdr */
  elf32_half e_phnum;                  /* number phdrs */
  elf32_half e_shentsize;              /* sizeof shdr */
  elf32_half e_shnum;                  /* number shdrs */
  elf32_half e_shstrndx;               /* shdr string index */
};

/* 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. */

struct elf32_shdr {
  elf32_word sh_name; 		/* section name */
  elf32_word sh_type; 		/* SHT_... */
  elf32_word sh_flags; 	        /* SHF_... */
  elf32_addr sh_addr; 		/* virtual address */
  elf32_off sh_offset; 	        /* file offset */
  elf32_word sh_size; 		/* section size */
  elf32_word sh_link; 		/* misc info */
  elf32_word sh_info; 		/* misc info */
  elf32_word sh_addralign; 	/* memory alignment */
  elf32_word sh_entsize; 	/* entry size if table */
};

/* 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_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 */

struct elf32_rel {
  elf32_addr      r_offset;       /* Location to be relocated. */
  elf32_word      r_info;         /* Relocation type and symbol index. */
};

struct elf32_rela {
  elf32_addr      r_offset;       /* Location to be relocated. */
  elf32_word      r_info;         /* Relocation type and symbol index. */
  elf32_sword     r_addend;       /* Addend. */
};

struct elf32_sym {
  elf32_word      st_name;        /* String table index of name. */
  elf32_addr      st_value;       /* Symbol value. */
  elf32_word      st_size;        /* Size of associated object. */
  unsigned char   st_info;        /* Type and binding information. */
  unsigned char   st_other;       /* Reserved (not used). */
  elf32_half      st_shndx;       /* Section index of symbol. */
};

#define ELF32_R_SYM(info)       ((info) >> 8)
#define ELF32_R_TYPE(info)      ((unsigned char)(info))

#define ELF_MAGIC_HEADER         "\177ELF\001\001\001"
#define ELF_MAGIC_HEADER_SIZE    7

#endif /* ELF32_H */