elf.h

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/* $Id: elf.h,v 1.2 2002/02/13 11:24:00 pefo Exp $ */
/*
 * Copyright (c) 2001-2002 Opsycon AB  (www.opsycon.se / www.opsycon.com)
 * 
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Opsycon AB, Sweden.
 * 4. 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.
 *
 */
/*
 * ELF data structures and values
 */

typedef unsigned short	Elf32_Half;
typedef unsigned int	Elf32_Word;
typedef signed int	Elf32_Sword;
typedef unsigned int	Elf32_Off;
typedef unsigned int	Elf32_Addr;
typedef unsigned char	Elf_Char;

/*
 * File Header 
 */

#define EI_NIDENT	16

typedef struct {
    Elf_Char	e_ident[EI_NIDENT];
    Elf32_Half	e_type;
    Elf32_Half	e_machine;
    Elf32_Word	e_version;
    Elf32_Addr	e_entry;
    Elf32_Off	e_phoff;
    Elf32_Off	e_shoff;
    Elf32_Word	e_flags;
    Elf32_Half	e_ehsize;
    Elf32_Half	e_phentsize;
    Elf32_Half	e_phnum;
    Elf32_Half	e_shentsize;
    Elf32_Half	e_shnum;
    Elf32_Half	e_shstrndx;
} Elf32_Ehdr;

/* e_indent */
#define EI_MAG0		0		/* File identification byte 0 index */
#define EI_MAG1		1		/* File identification byte 1 index */
#define EI_MAG2		2		/* File identification byte 2 index */
#define EI_MAG3		3		/* File identification byte 3 index */
#define EI_CLASS	4		/* File class */
#define  ELFCLASSNONE	 0		 /* Invalid class */
#define  ELFCLASS32	 1		 /* 32-bit objects */
#define  ELFCLASS64	 2		 /* 64-bit objects */
#define EI_DATA		5		/* Data encoding */
#define  ELFDATANONE	 0		 /* Invalid data encoding */
#define  ELFDATA2LSB	 1		 /* 2's complement, little endian */
#define  ELFDATA2MSB	 2		 /* 2's complement, big endian */
#define EI_VERSION	6		/* File version */
#define EI_PAD		7		/* Start of padding bytes */

#define ELFMAG0		0x7F		/* Magic number byte 0 */
#define ELFMAG1		'E'		/* Magic number byte 1 */
#define ELFMAG2		'L'		/* Magic number byte 2 */
#define ELFMAG3		'F'		/* Magic number byte 3 */

/* 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_LOPROC	0xFF00		/* Processor-specific */
#define ET_HIPROC	0xFFFF		/* Processor-specific */

/* e_machine */
#define EM_NONE		0		/* No machine */
#define EM_M32		1		/* AT&T WE 32100 */
#define EM_SPARC	2		/* SUN SPARC */
#define EM_386		3		/* Intel 80386 */
#define EM_68K		4		/* Motorola m68k family */
#define EM_88K		5		/* Motorola m88k family */
#define EM_860		7		/* Intel 80860 */
#define EM_MIPS		8		/* MIPS R3000  */

#define EM_PPC          20              /* PowerPC */

/* e_version */
#define EV_NONE		0		/* Invalid ELF version */
#define EV_CURRENT	1		/* Current version */


/*
 * Program Header 
 */
typedef struct {
  Elf32_Word	p_type;			/* Identifies program 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 size in file */
  Elf32_Word	p_memsz;		/* Segment size in memory */
  Elf32_Word	p_flags;		/* Segment flags */
  Elf32_Word	p_align;		/* Segment alignment, file & memory */
} Elf32_Phdr;


/* 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_LOPROC	0x70000000	/* Processor-specific */
#define PT_HIPROC	0x7FFFFFFF	/* Processor-specific */

/* p_flags */
#define PF_X		(1 << 0)	/* Segment is executable */
#define PF_W		(1 << 1)	/* Segment is writable */
#define PF_R		(1 << 2)	/* Segment is readable */
#define PF_MASKPROC	0xF0000000	/* Processor-specific reserved bits */


/*
 * Section Header 
 */
typedef struct {
    Elf32_Word	sh_name;
    Elf32_Word	sh_type;
    Elf32_Word	sh_flags;
    Elf32_Addr	sh_addr;
    Elf32_Off	sh_offset;
    Elf32_Word	sh_size;
    Elf32_Word	sh_link;
    Elf32_Word	sh_info;
    Elf32_Word	sh_addralign;
    Elf32_Word	sh_entsize;
} Elf32_Shdr;

/* sh_type */
#define SHT_NULL	0		/* Section header table entry unused */
#define SHT_PROGBITS	1		/* Program specific (private) data */
#define SHT_SYMTAB	2		/* Link editing symbol table */
#define SHT_STRTAB	3		/* A string table */
#define SHT_RELA	4		/* Relocation entries with addends */
#define SHT_HASH	5		/* A symbol hash table */
#define SHT_DYNAMIC	6		/* Information for dynamic linking */
#define SHT_NOTE	7		/* Information that marks file */
#define SHT_NOBITS	8		/* Section occupies no space in file */
#define SHT_REL		9		/* Relocation entries, no addends */
#define SHT_SHLIB	10		/* Reserved, unspecified semantics */
#define SHT_DYNSYM	11		/* Dynamic linking symbol table */
#define SHT_LOPROC	0x70000000	/* Processor-specific semantics, lo */
#define SHT_HIPROC	0x7FFFFFFF	/* Processor-specific semantics, hi */
#define SHT_LOUSER	0x80000000	/* Application-specific semantics */
#define SHT_HIUSER	0x8FFFFFFF	/* Application-specific semantics */

/* sh_flags */
#define SHF_WRITE	(1 << 0)	/* Writable data during execution */
#define SHF_ALLOC	(1 << 1)	/* Occupies memory during execution */
#define SHF_EXECINSTR	(1 << 2)	/* Executable machine instructions */
#define SHF_MASKPROC	0xF0000000	/* Processor-specific semantics */


/*
 * Symbol Table
 */
typedef struct {
    Elf32_Word	st_name;
    Elf32_Addr	st_value;
    Elf32_Word	st_size;
    Elf_Char	st_info;
    Elf_Char	st_other;
    Elf32_Half	st_shndx;
} Elf32_Sym;


#define ELF_ST_BIND(val)		(((unsigned int)(val)) >> 4)
#define ELF_ST_TYPE(val)		((val) & 0xF)
#define ELF_ST_INFO(bind,type)		(((bind) << 4) | ((type) & 0xF))

/* symbol binding */
#define STB_LOCAL	0		/* Symbol not visible outside obj */
#define STB_GLOBAL	1		/* Symbol visible outside obj */
#define STB_WEAK	2		/* Like globals, lower precedence */
#define STB_LOPROC	13		/* Application-specific semantics */
#define STB_HIPROC	15		/* Application-specific semantics */

/* symbol type */
#define STT_NOTYPE	0		/* Symbol type is unspecified */
#define STT_OBJECT	1		/* Symbol is a data object */
#define STT_FUNC	2		/* Symbol is a code object */
#define STT_SECTION	3		/* Symbol associated with a section */
#define STT_FILE	4		/* Symbol gives a file name */
#define STT_LOPROC	13		/* Application-specific semantics */
#define STT_HIPROC	15		/* Application-specific semantics */

/* special values st_shndx */
#define SHN_UNDEF	0		/* Undefined section reference */
#define SHN_LORESERV	0xFF00		/* Begin range of reserved indices */
#define SHN_LOPROC	0xFF00		/* Begin range of appl-specific */
#define SHN_HIPROC	0xFF1F		/* End range of appl-specific */
#define SHN_ABS		0xFFF1		/* Associated symbol is absolute */
#define SHN_COMMON	0xFFF2		/* Associated symbol is in common */
#define SHN_HIRESERVE	0xFFFF		/* End range of reserved indices */