cs350/kern/include/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_ */