elf.h

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	elf.h
 *
 *	ELF (Executable and Linking Format) definitions
 */

#ifndef __SYS_ELF_H__
#define __SYS_ELF_H__

#include <basic.h>


#ifdef __cplusplus
extern "C" {
#endif

/* ELF header */
#define	EI_NIDENT	16
typedef struct {
	UB	e_ident[EI_NIDENT];	/* ELF identifier */
	UH	e_type;			/* Object format */
	UH	e_machine;		/* Model */
	UW	e_version;		/* File format/version */
	VP	e_entry;		/* Entry address */
	UW	e_phoff;		/* Position of program header */
	UW	e_shoff;		/* Position of section header */
	UW	e_flags;		/* Flag (EF_xxx) */
	UH	e_ehsize;		/* ELF header size */
	UH	e_phentsize;		/* Size of a program header */
	UH	e_phnum;		/* Number of program headers */
	UH	e_shentsize;		/* Size of a section header */
	UH	e_shnum;		/* Number of section headers */
	UH	e_shstrndx;		/* Position of section header character sting */
} Elf32_Ehdr;

/* Index of e_ident[] */
#define	EI_MAG0		0		/* Magic */
#define	EI_MAG1		1
#define	EI_MAG2		2
#define	EI_MAG3		3
#define	EI_CLASS	4		/* File class */
#define	EI_DATA		5		/* Data encoding */
#define	EI_VERSION	6		/* ELF version */
#define	EI_PAD		7		/* Reserved (0) */

/* EI_MAG */
#define	ELFMAG0		0x7fU
#define	ELFMAG1		'E'
#define	ELFMAG2		'L'
#define	ELFMAG3		'F'

/* EI_CLASS */
#define	ELFCLASSNONE	0		/* Invalid */
#define	ELFCLASS32	1		/* 32bit object */
#define	ELFCLASS64	2		/* 64bit object */

/* EI_DATA */
#define	ELFDATANONE	0		/* Invalid */
#define	ELFDATA2LSB	1		/* Two's complement, little endian */
#define	ELFDATA2MSB	2		/* Two's complement, big endian */

/* e_type */
#define	ET_NONE		0U		/* Unknown */
#define	ET_REL		1U		/* Relocatable format */
#define	ET_EXEC		2U		/* Executable format */
#define	ET_DYN		3U		/* Shared object format */
#define	ET_CORE		4U		/* core format */
#define	ET_LOPROC	0xff00U		/* CPU-specific */
#define	ET_HIPROC	0xffffU

/* e_machine */
#define	EM_NONE		0		/* Unknown */
#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 68000 */
#define	EM_88K		5		/* Motorola 88000 */
#define	EM_486		6		/* Intel 80486 */
#define	EM_860		7		/* Intel i860 */
#define EM_MIPS		8		/* MIPS R3000 */
#define	EM_V810		0x24		/* NEC V810 */
#define EM_ARM		40		/* ARM */
#define	EM_SH		42		/* Hitachi SH */

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


/* Section header */
typedef struct {
	UW	sh_name;		/* Section name (index) */
	UW	sh_type;		/* Section type (SHT_xxx) */
	UW	sh_flags;		/* Section flag (SHF_xxx) */
	VP	sh_addr;		/* Address */
	UW	sh_offset;		/* Section position */
	UW	sh_size;		/* Section size */
	UW	sh_link;		/* Section connection information */
	UW	sh_info;		/* Extension information */
	UW	sh_addralign;		/* Alignment */
	UW	sh_entsize;		/* Entry size */
} Elf32_Shdr;

/* sh_name : Special section name index */
#define	SHN_UNDEF		0U		/* Not defined */
#define	SHN_LORESERVE		0xff00U		/* Start of special section name index */
#define	SHN_ABS			0xfff1U		/* Fixed value section */
#define	SHN_COMMON		0xfff2U		/* Shared symbol section */
#define	SHN_HIRESERVE		0xffffU		/* End of special section name index */
#define	SHN_LOPROC		0xff00U		/* CPU-specific */
#define	SHN_HIPROC		0xff1fU

/* sh_type */
#define	SHT_NULL		0U		/* Invalid section */
#define	SHT_PROGBITS		1U		/* Program */
#define	SHT_SYMTAB		2U		/* Symbol table */
#define	SHT_STRTAB		3U		/* String table */
#define	SHT_RELA		4U		/* Relocation information */
#define	SHT_HASH		5U		/* Symbol hash table */
#define	SHT_DYNAMIC		6U		/* Dynamic link information */
#define	SHT_NOTE		7U		/* Note */
#define	SHT_NOBITS		8U		/* Free section */
#define	SHT_REL			9U		/* Relocation information */
#define	SHT_SHLIB		10U		/* (Reserved) */
#define	SHT_DYNSYM		11U		/* Symbol table for dynamic link */
#define	SHT_LOUSER		0x80000000U	/* Application-specific */
#define	SHT_HIUSER		0xffffffffU
#define	SHT_LOPROC		0x70000000U	/* CPU-specific */
#define	SHT_HIPROC		0x7fffffffU
#define SHT_MIPS_REGINFO	0x70000006U	/* MIPS-specific */

/* sh_flags */
#define	SHF_WRITE		0x1U		/* Write enabled at runtime */
#define	SHF_ALLOC		0x2U		/* Occupy memory at runtime*/
#define	SHF_EXECINSTR		0x4U		/* Include execution command */
#define	SHF_MASKPROC		0xf0000000U	/* CPU-specific */


/* Symbol table */
typedef struct {
	UW	st_name;		/* Symbol name (index) */
	VP	st_value;		/* Value */
	UW	st_size;		/* Size */
	UB	st_info;		/* Symbol type and join attribute */
	UB	st_other;		/* Reserved (0) */
	UH	st_shndx;		/* Section index */
} Elf32_Sym;

#define	STN_UNDEF	0		/* Not defined */

/* st_info */
#define	ELF32_ST_BIND(info)		((UB)(info) >> 4)
#define	ELF32_ST_TYPE(info)		((UB)(info) & 0xf)
#define	ELF32_ST_INFO(bind, type)	(UB)(((bind) << 4) + ((type) & 0xf))

/* st_info : bind */
#define	STB_LOCAL	0U	/* Local symbol */
#define	STB_GLOBAL	1U	/* Global symbol */
#define	STB_WEAK	2U	/* Weak global symbol */
#define	STB_LOPROC	13U	/* CPU-specific */
#define	STB_HIPROC	15U

/* st_info : type */
#define	STT_NOTYPE	0U	/* Not defined */
#define	STT_OBJECT	1U	/* Data */
#define	STT_FUNC	2U	/* Function */
#define	STT_SECTION	3U	/* Section */
#define	STT_FILE	4U	/* File name */
#define	STT_LOPROC	13U	/* CPU-specific */
#define	STT_HIPROC	15U

/* st_other */
#define STO_MIPS16	0xf0	/* mips16 */

/* Relocation */
typedef struct {
	VP	r_offset;	/* Position to be relocated */
	UW	r_info;		/* Symbol number and relocation type */
} Elf32_Rel;

typedef struct {
	VP	r_offset;	/* Position to be relocated */
	UW	r_info;		/* Symbol number and relocation type */
	W	r_addend;	/* Constant to be added */
} Elf32_Rela;

/* r_info */
#define	ELF32_R_SYM(info)	((UW)(info) >> 8)
#define	ELF32_R_TYPE(info)	((UB)(info))
#define	ELF32_R_INFO(sym, type)	(UW)(((sym) << 8) + (UB)(type))

/* i386 Relocation Type */
#define	R_386_NONE	0
#define	R_386_32	1
#define	R_386_PC32	2
#define	R_386_GOT32	3
#define	R_386_PLT32	4
#define	R_386_COPY	5
#define	R_386_GLOB_DAT	6
#define	R_386_JMP_SLOT	7
#define	R_386_RELATIVE	8
#define	R_386_GOTOFF	9
#define	R_386_GOTPC	10

/* SH Relocation Type */
#define R_SH_NONE	0	/* No relocation */
#define R_SH_DIR32	1	/* 32 bit absolute relocation */
#define R_SH_REL32	2	/* 32 bit PC relative relocation */
#define R_SH_DIR8WPN	3	/* 8 bit PC relative branch divided by 2 */
#define R_SH_IND12W	4	/* 12 bit PC relative branch divided by 2 */
#define R_SH_DIR8WPL	5	/* 8 bit unsigned PC relative divided by 4 */
#define R_SH_DIR8WPZ	6	/* 8 bit unsigned PC relative divided by 2 */
#define R_SH_DIR8BP	7	/* 8 bit GBR relative */
#define R_SH_DIR8W	8	/* 8 bit GBR relative divided by 2 */
#define R_SH_DIR8L	9	/* 8 bit GBR relative divided by 4 */
#define R_SH_GOT32	160
#define R_SH_PLT32	161
#define R_SH_COPY	162
#define R_SH_GLOB_DAT	163
#define R_SH_JMP_SLOT	164
#define R_SH_RELATIVE	165

/* ARM Relocation Type */
#define R_ARM_NONE	0
#define R_ARM_PC24	1
#define R_ARM_ABS32	2
#define R_ARM_REL32	3
#define R_ARM_THM_PC22	10
#define R_ARM_COPY	20	/* Copy symbol at runtime.  */
#define R_ARM_GLOB_DAT	21	/* Create GOT entry.  */
#define R_ARM_JUMP_SLOT	22	/* Create PLT entry.  */
#define R_ARM_RELATIVE	23	/* Adjust by program base.  */
#define R_ARM_GOTOFF	24	/* 32 bit offset to GOT.  */
#define R_ARM_GOTPC	25	/* 32 bit PC relative offset to GOT.  */
#define R_ARM_GOT32	26	/* 32 bit GOT entry.  */
#define R_ARM_PLT32	27	/* 32 bit PLT address.  */

/* MIPS Relocation Type */
#define R_MIPS_NONE	0
#define R_MIPS_16	1
#define R_MIPS_32	2
#define R_MIPS_REL32	3
#define R_MIPS_26	4
#define R_MIPS_HI16	5
#define R_MIPS_LO16	6
#define R_MIPS_GPREL16	7
#define R_MIPS_LITERAL	8
#define R_MIPS16_26	100
#define R_MIPS16_GPREL	101

/* Program header */
typedef struct {
	UW	p_type;		/* Segment format */
	UW	p_offset;	/* Segment position */
	VP	p_vaddr;	/* Virtual address */
	VP	p_paddr;	/* Physical address */
	UW	p_filesz;	/* Segment size in file */
	UW	p_memsz;	/* Segment size on memory */
	UW	p_flags;	/* Flag (PF_xxx) */
	UW	p_align;	/* Alignment */
} Elf32_Phdr;

/* p_type */
#define	PT_NULL		0		/* Invalid segment */
#define	PT_LOAD		1		/* Loadable segment */
#define	PT_DYNAMIC	2		/* Dynamic link information */
#define	PT_INTERP	3		/* Interpreter path name */
#define	PT_NOTE		4		/* Supplementary information */
#define	PT_SHLIB	5		/* (Reserved) */
#define	PT_PHDR		6		/* Program header itself */
#define	PT_LOPROC	0x70000000	/* CPU-specific */
#define	PT_HIPROC	0x7fffffff

/* p_flags */
#define	PF_R		0x4		/* Read */
#define	PF_W		0x2		/* Write */
#define	PF_X		0x1		/* Execute */
#define	PF_MASKPROC	0xf0000000	/* CPU-specific */


/* Dynamic structure */
typedef struct {
	W	d_tag;		/* Type */
	union {
		UW	d_val;	/* Value */
		VP	d_ptr;	/* Virtual address */
	} d_un;
} Elf32_Dyn;

IMPORT	Elf32_Dyn	_DYNAMIC[];

/* d_tag  I:ignored V:d_val P:d_ptr */
#define	DT_NULL			0		/* I: _DYNAMIC end mark */
#define	DT_NEEDED		1		/* V: Dependent library name */
#define	DT_PLTRELSZ		2		/* V: PLT size */
#define	DT_PLTGOT		3		/* P: PLT and/or GOT */
#define	DT_HASH			4		/* P: Symbol hash table */
#define	DT_STRTAB		5		/* P: String table */
#define	DT_SYMTAB		6		/* P: Symbol table */
#define	DT_RELA			7		/* P: Relocation table Elf32_Rela */
#define	DT_RELASZ		8		/* V: Total size of DT_RELA */
#define	DT_RELAENT		9		/* V: Size of DT_RELA entry */
#define	DT_STRSZ		10		/* V: Size of string table */
#define	DT_SYMENT		11		/* V: Size of symbol table entry */
#define	DT_INIT			12		/* P: Address of initialization processing function */
#define	DT_FINI			13		/* P: Address of termination processing function */
#define	DT_SONAME		14		/* V: Shared object name */
#define	DT_RPATH		15		/* V: Library search path name */
#define	DT_SYMBOLIC		16		/* I: Specify change of symbol analysis method */
#define	DT_REL			17		/* P: Relocation table Elf32_Rel */
#define	DT_RELSZ		18		/* V: Total size of DT_REL */
#define	DT_RELENT		19		/* V: Size of DT_REL entry */
#define	DT_PLTREL		20		/* V: Relocation type REL/RELA of PLT */
#define	DT_DEBUG		21		/* P: For debugging */
#define	DT_TEXTREL		22		/* I: Specify text relocation */
#define	DT_JMPREL		23		/* P: Position of PLTREL that allows lazy binding */
#define	DT_LOPROC		0x70000000	/* CPU-dependent From */
#define	DT_HIPROC		0x7fffffff	/*          To */

#define	DT_MIPS_LOCAL_GOTNO	0x7000000a	/* Number of local GOT entries */
#define	DT_MIPS_SYMTABNO	0x70000011	/* Number of DYNSYM entries */
#define	DT_MIPS_GOTSYM		0x70000013	/* First GOT entry */

/* Global offset table */
IMPORT	VP		_GLOBAL_OFFSET_TABLE_[];


/* Hashing function */
Inline UW Elf_hash( const UB *name )
{
	UW	h = 0, g;

	while ( *name != '\0' ) {
		h = (h << 4) + *(name++);
		g = h & 0xf0000000U;
		h = (h ^ (g >> 24)) & ~g;
	}

	return h;
}

/* Register Information */
typedef struct {
  UW	ri_gprmask;		/* General-purpose register in use */
  UW	ri_cprmask[4];		/* Coprocessor register in use */
  W	ri_gp_value;		/* gp register value */
} Elf32_RegInfo;

#ifdef __cplusplus
}
#endif
#endif /* __SYS_ELF_H__ */