elf.h File Reference

ELF image format. More...

#include <elf.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
int	elf_load (struct image *image)
	Load ELF image into memory.

---

Detailed Description

ELF image format.

Definition in file elf.h.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

int elf_load

(

struct image *

image

)

Load ELF image into memory.

Parameters:

image

ELF file

Return values:

rc

Return status code

Definition at line 121 of file elf.c.

References assert, copy_from_user(), image::data, DBGC, Elf32_Ehdr::e_entry, Elf32_Ehdr::e_ident, Elf32_Ehdr::e_phentsize, Elf32_Ehdr::e_phnum, Elf32_Ehdr::e_phoff, EI_MAG0, elf_load_segment(), ELFMAG, ENOEXEC, image::len, memcmp(), NULL, image::phys, image::priv, SELFMAG, and image::type.

Referenced by elfboot_load(), and multiboot_load_elf().

                                     {
        Elf_Ehdr ehdr;
        Elf_Phdr phdr;
        Elf_Off phoff;
        unsigned int phnum;
        int rc;

        /* Image type must already have been set by caller */
        assert ( image->type != NULL );

        /* Read ELF header */
        copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) );
        if ( memcmp ( &ehdr.e_ident[EI_MAG0], ELFMAG, SELFMAG ) != 0 ) {
                DBGC ( image, "ELF %p has invalid signature\n", image );
                return -ENOEXEC;
        }

        /* Invalidate execution address */
        image->priv.phys = 0;

        /* Read ELF program headers */
        for ( phoff = ehdr.e_phoff , phnum = ehdr.e_phnum ; phnum ;
              phoff += ehdr.e_phentsize, phnum-- ) {
                if ( phoff > image->len ) {
                        DBGC ( image, "ELF %p program header %d outside "
                               "image\n", image, phnum );
                        return -ENOEXEC;
                }
                copy_from_user ( &phdr, image->data, phoff, sizeof ( phdr ) );
                if ( ( rc = elf_load_segment ( image, &phdr, &ehdr ) ) != 0 )
                        return rc;
        }

        /* Check for a valid execution address */
        if ( ! image->priv.phys ) {
                DBGC ( image, "ELF %p entry point %lx outside image\n",
                       image, ( ( unsigned long ) ehdr.e_entry ) );
                return -ENOEXEC;
        }

        return 0;
}