ELF File Format

API for loading and managing ELF files More...

Topics
	Architecture Types
	Relevant ELF architecture type codes
	Relocation Types
	ELF relocation type values
	Section Header Flags
	ELF section header flags
	Section Header Types
	ELF section header type values
	Special Section Indices
	ELF section indices
	Symbol Binding Types
	ELF symbol binding type values
	Symbol Types
	ELF symbol type values

Files
file	elf.h
	ELF binary loading support.

Data Structures
struct	elf_hdr_t
	ELF file header. More...
struct	elf_shdr_t
	ELF Section header. More...
struct	elf_sym_t
	Symbol table entry. More...
struct	elf_rela_t
	ELF Relocation entry (with explicit addend). More...
struct	elf_rel_t
	ELF Relocation entry (without explicit addend). More...
struct	elf_prog_t
	Kernel-specific definition of a loaded ELF binary. More...

Macros
#define	ELF32_ST_BIND(info)   ((info) >> 4)
	Retrieve the binding type for a symbol.
#define	ELF32_ST_TYPE(info)   ((info) & 0xf)
	Retrieve the symbol type for a symbol.
#define	ELF32_R_SYM(i)   ((i) >> 8)
	Retrieve the symbol index from a relocation entry.
#define	ELF32_R_TYPE(i)   ((uint8)(i))
	Retrieve the relocation type from a relocation entry.

Functions
int	elf_load (const char *fn, struct klibrary *shell, elf_prog_t *out)
	Load an ELF binary.
void	elf_free (elf_prog_t *prog)
	Free a loaded ELF program.

Detailed Description

API for loading and managing ELF files

Macro Definition Documentation

ELF32_R_SYM

#define ELF32_R_SYM

(

i

)

((i) >> 8)

Retrieve the symbol index from a relocation entry.

Parameters

i	The info field of an elf_rel_t or elf_rela_t.

Returns

The symbol table index from that relocation entry.

ELF32_R_TYPE

#define ELF32_R_TYPE

(

i

)

((uint8)(i))

Retrieve the relocation type from a relocation entry.

Parameters

i	The info field of an elf_rel_t or an elf_rela_t.

Returns

The relocation type of that relocation.

See also

Relocation Types

ELF32_ST_BIND

#define ELF32_ST_BIND

(

info

)

((info) >> 4)

Retrieve the binding type for a symbol.

Parameters

info	The info field of an elf_sym_t.

Returns

The binding type of the symbol.

See also

Symbol Binding Types

ELF32_ST_TYPE

#define ELF32_ST_TYPE

(

info

)

((info) & 0xf)

Retrieve the symbol type for a symbol.

Parameters

info	The info field of an elf_sym_t.

Returns

The symbol type of the symbol.

See also

Symbol Types

Function Documentation

elf_free()

void elf_free

(

elf_prog_t *

prog

)

Free a loaded ELF program.

This function cleans up an ELF binary that was loaded with elf_load().

Parameters

prog	The loaded binary to clean up.

elf_load()

int elf_load	(	const char *	fn,
		struct klibrary *	shell,
		elf_prog_t *	out )

Load an ELF binary.

This function loads an ELF binary from the VFS and fills in an elf_prog_t for it.

Parameters

fn	The filename of the binary on the VFS.
shell	Unused?
out	Storage for the binary that will be loaded.

Returns

0 on success, <0 on failure.