add module feature

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@604 bbd45198-f89e-11dd-88c7-29a3b14d5316

1 files changed, 205 insertions, 0 deletions

diff --git a/src/module.h b/src/module.h
new file mode 100644
index 0000000000..ae2e8b83a8
--- /dev/null
+++ b/src/module.h
@@ -0,0 +1,205 @@
+#ifndef __MODULE_H__

+#define __MODULE_H__

+

+#include <rtdef.h>

+

+typedef rt_uint8_t	Elf_Byte;

+

+typedef rt_uint32_t	Elf32_Addr;	/* Unsigned program address */

+typedef rt_uint32_t	Elf32_Off;	/* Unsigned file offset */

+typedef rt_int32_t	Elf32_Sword;	/* Signed large integer */

+typedef rt_uint32_t	Elf32_Word;	/* Unsigned large integer */

+typedef rt_uint16_t	Elf32_Half;	/* Unsigned medium integer */

+

+/* e_ident[] magic number */

+#define	ELFMAG0		0x7f		/* e_ident[EI_MAG0] */

+#define	ELFMAG1		'E'			/* e_ident[EI_MAG1] */

+#define	ELFMAG2		'L'			/* e_ident[EI_MAG2] */

+#define	ELFMAG3		'F'			/* e_ident[EI_MAG3] */

+#define	ELFMAG		"\177ELF"	/* magic */

+#define	SELFMAG		4			/* size of magic */

+

+#define EI_CLASS	4		/* file class */

+#define EI_NIDENT	16			/* Size of e_ident[] */

+

+/* e_ident[] file class */

+#define	ELFCLASSNONE	0		/* invalid */

+#define	ELFCLASS32		1		/* 32-bit objs */

+#define	ELFCLASS64		2		/* 64-bit objs */

+#define	ELFCLASSNUM		3		/* number of classes */

+

+/* e_ident[] data encoding */

+#define ELFDATANONE		0		/* invalid */

+#define ELFDATA2LSB		1		/* Little-Endian */

+#define ELFDATA2MSB		2		/* Big-Endian */

+#define ELFDATANUM		3		/* number of data encode defines */

+

+/* e_ident */

+#define IS_ELF(ehdr) ((ehdr).e_ident[EI_MAG0] == ELFMAG0 && \

+                      (ehdr).e_ident[EI_MAG1] == ELFMAG1 && \

+                      (ehdr).e_ident[EI_MAG2] == ELFMAG2 && \

+                      (ehdr).e_ident[EI_MAG3] == ELFMAG3)

+

+/* ELF Header */

+typedef struct elfhdr {

+	unsigned char	e_ident[EI_NIDENT]; /* ELF Identification */

+	Elf32_Half	e_type;		/* object file type */

+	Elf32_Half	e_machine;	/* machine */

+	Elf32_Word	e_version;	/* object file version */

+	Elf32_Addr	e_entry;	/* virtual entry point */

+	Elf32_Off	e_phoff;	/* program header table offset */

+	Elf32_Off	e_shoff;	/* section header table offset */

+	Elf32_Word	e_flags;	/* processor-specific flags */

+	Elf32_Half	e_ehsize;	/* ELF header size */

+	Elf32_Half	e_phentsize;	/* program header entry size */

+	Elf32_Half	e_phnum;	/* number of program header entries */

+	Elf32_Half	e_shentsize;	/* section header entry size */

+	Elf32_Half	e_shnum;	/* number of section header entries */

+	Elf32_Half	e_shstrndx;	/* section header table's "section

+					   header string table" entry offset */

+} Elf32_Ehdr;

+

+/* Section Header */

+typedef struct {

+	Elf32_Word	sh_name;	/* name - index into section header

+					   string table section */

+	Elf32_Word	sh_type;	/* type */

+	Elf32_Word	sh_flags;	/* flags */

+	Elf32_Addr	sh_addr;	/* address */

+	Elf32_Off	sh_offset;	/* file offset */

+	Elf32_Word	sh_size;	/* section size */

+	Elf32_Word	sh_link;	/* section header table index link */

+	Elf32_Word	sh_info;	/* extra information */

+	Elf32_Word	sh_addralign;	/* address alignment */

+	Elf32_Word	sh_entsize;	/* section entry size */

+} Elf32_Shdr;

+

+/* Section names */

+#define ELF_BSS         ".bss"		/* uninitialized data */

+#define ELF_DATA        ".data"		/* initialized data */

+#define ELF_DEBUG       ".debug"	/* debug */

+#define ELF_DYNAMIC     ".dynamic"	/* dynamic linking information */

+#define ELF_DYNSTR      ".dynstr"	/* dynamic string table */

+#define ELF_DYNSYM      ".dynsym"	/* dynamic symbol table */

+#define ELF_FINI        ".fini"		/* termination code */

+#define ELF_GOT         ".got"		/* global offset table */

+#define ELF_HASH        ".hash"		/* symbol hash table */

+#define ELF_INIT        ".init"		/* initialization code */

+#define ELF_REL_DATA    ".rel.data"	/* relocation data */

+#define ELF_REL_FINI    ".rel.fini"	/* relocation termination code */

+#define ELF_REL_INIT    ".rel.init"	/* relocation initialization code */

+#define ELF_REL_DYN     ".rel.dyn"	/* relocaltion dynamic link info */

+#define ELF_REL_RODATA  ".rel.rodata"	/* relocation read-only data */

+#define ELF_REL_TEXT    ".rel.text"	/* relocation code */

+#define ELF_RODATA      ".rodata"	/* read-only data */

+#define ELF_SHSTRTAB    ".shstrtab"	/* section header string table */

+#define ELF_STRTAB      ".strtab"	/* string table */

+#define ELF_SYMTAB      ".symtab"	/* symbol table */

+#define ELF_TEXT        ".text"		/* code */

+

+/* Symbol Table Entry */

+typedef struct elf32_sym {

+	Elf32_Word	st_name;	/* name - index into string table */

+	Elf32_Addr	st_value;	/* symbol value */

+	Elf32_Word	st_size;	/* symbol size */

+	unsigned char	st_info;	/* type and binding */

+	unsigned char	st_other;	/* 0 - no defined meaning */

+	Elf32_Half	st_shndx;	/* section header index */

+} Elf32_Sym;

+

+#define	STB_LOCAL	0		/* BIND */

+#define	STB_GLOBAL	1

+#define	STB_WEAK	2

+#define	STB_NUM	3

+ 

+#define	STB_LOPROC	13		/* processor specific range */

+#define	STB_HIPROC	15

+

+#define	STT_NOTYPE	0		/* symbol type is unspecified */

+#define	STT_OBJECT	1		/* data object */

+#define	STT_FUNC	2		/* code object */

+#define	STT_SECTION	3	/* symbol identifies an ELF section */

+#define	STT_FILE	4		/* symbol's name is file name */

+#define	STT_COMMON	5	/* common data object */

+#define	STT_TLS		6		/* thread-local data object */

+#define	STT_NUM	7		/* # defined types in generic range */

+#define	STT_LOOS	10		/* OS specific range */

+#define	STT_HIOS	12

+#define	STT_LOPROC	13		/* processor specific range */

+#define	STT_HIPROC	15

+    

+

+#define	ELF_ST_BIND(info)			((info) >> 4)

+#define	ELF_ST_TYPE(info)			((info) & 0xf)

+#define	ELF_ST_INFO(bind, type)		(((bind)<<4)+((type)&0xf))	

+

+/* Relocation entry with implicit addend */

+typedef struct {

+	Elf32_Addr	r_offset;	/* offset of relocation */

+	Elf32_Word	r_info;		/* symbol table index and type */

+} Elf32_Rel;

+

+/* Relocation entry with explicit addend */

+typedef struct {

+	Elf32_Addr	r_offset;	/* offset of relocation */

+	Elf32_Word	r_info;		/* symbol table index and type */

+	Elf32_Sword	r_addend;

+} Elf32_Rela;

+

+/* Extract relocation info - r_info */

+#define ELF32_R_SYM(i)		((i) >> 8)

+#define ELF32_R_TYPE(i)		((unsigned char) (i))

+#define ELF32_R_INFO(s,t) 	(((s) << 8) + (unsigned char)(t))

+

+/*

+ * Relocation type for arm

+ */

+#define	R_ARM_NONE	0

+#define	R_ARM_PC24	1

+#define	R_ARM_ABS32	2

+#define	R_ARM_PLT32	27

+#define	R_ARM_CALL	28

+#define R_ARM_JUMP24	29

+

+/* Program Header */

+typedef struct {

+	Elf32_Word	p_type;		/* segment type */

+	Elf32_Off	p_offset;	/* segment offset */

+	Elf32_Addr	p_vaddr;	/* virtual address of segment */

+	Elf32_Addr	p_paddr;	/* physical address - ignored? */

+	Elf32_Word	p_filesz;	/* number of bytes in file for seg. */

+	Elf32_Word	p_memsz;	/* number of bytes in mem. for seg. */

+	Elf32_Word	p_flags;	/* flags */

+	Elf32_Word	p_align;	/* memory alignment */

+} Elf32_Phdr;

+

+/* 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_NUM		12		/* number of section types */

+#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 */

+

+/* Section Attribute Flags - sh_flags */

+#define SHF_WRITE	0x1		/* Writable */

+#define SHF_ALLOC	0x2		/* occupies memory */

+#define SHF_EXECINSTR	0x4		/* executable */

+#define SHF_MASKPROC	0xf0000000	/* reserved bits for processor */

+					/*  specific section attributes */

+

+/* Symbol table index */

+#define STN_UNDEF	0		/* undefined */

+

+#endif