From 7a3606eeb9fc778bab000dd50bf7fbee6bc59ee4 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Fri, 1 Jul 2011 11:22:21 +0200 Subject: Reworked libelf to support relocation Split elf.c into elf32.c and elf64.c for better readability. Added relocation code to libelf for 64-bit ELF images, modified the Paflof Makefile to link the executable with relocation information and load Paflof now to the upper end of the memory. Signed-off-by: Thomas Huth --- include/libelf.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 72 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/libelf.h b/include/libelf.h index 905c76b..7407cf3 100644 --- a/include/libelf.h +++ b/include/libelf.h @@ -1,5 +1,5 @@ /****************************************************************************** - * Copyright (c) 2004, 2008 IBM Corporation + * Copyright (c) 2004, 2011 IBM Corporation * All rights reserved. * This program and the accompanying materials * are made available under the terms of the BSD License @@ -10,9 +10,79 @@ * IBM Corporation - initial implementation *****************************************************************************/ +/* + * ELF loader library + */ + #ifndef __LIBELF_H #define __LIBELF_H -int load_elf_file(unsigned long *, unsigned long *); +#include + +/* ELF object file types */ +#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 */ + +/* Generic ELF header */ +struct ehdr { + uint32_t ei_ident; + uint8_t ei_class; + uint8_t ei_data; + uint8_t ei_version; + uint8_t ei_pad[9]; + uint16_t e_type; + uint16_t e_machine; + uint32_t e_version; +}; + +/* Section types (sh_type) */ +#define SHT_NULL 0 /* Unused section header */ +#define SHT_PROGBITS 1 /* Information defined by the program */ +#define SHT_SYMTAB 2 /* Linker symbol table */ +#define SHT_STRTAB 3 /* String table */ +#define SHT_RELA 4 /* "Rela" type relocation entries */ +#define SHT_HASH 5 /* Symbol hash table */ +#define SHT_DYNAMIC 6 /* Dynamic linking tables */ +#define SHT_NOTE 7 /* Note information */ +#define SHT_NOBITS 8 /* Uninitialized space */ +#define SHT_REL 9 /* "Rel" type relocation entries */ +#define SHT_SHLIB 10 /* Reserved */ +#define SHT_DYNSYM 11 /* Dynamic loader symbol table */ + +/* Section attributs (sh_flags) */ +#define SHF_WRITE 0x1 +#define SHF_ALLOC 0x2 +#define SHF_EXECINSTR 0x4 + +/* Segment types (p_type) */ +#define PT_NULL 0 /* Unused entry */ +#define PT_LOAD 1 /* Loadable segment */ +#define PT_DYNAMIC 2 /* Dynamic linking tables */ +#define PT_INTERP 3 /* Program interpreter path name */ +#define PT_NOTE 4 /* Note sections */ + + +int elf_load_file(void *file_addr, unsigned long *entry, + int (*pre_load)(void*, long), + void (*post_load)(void*, long)); +int elf_load_file_to_addr(void *file_addr, void *addr, unsigned long *entry, + int (*pre_load)(void*, long), + void (*post_load)(void*, long)); + +unsigned int elf_load_segments32(void *file_addr, signed long offset, + int (*pre_load)(void*, long), + void (*post_load)(void*, long)); +unsigned long elf_load_segments64(void *file_addr, signed long offset, + int (*pre_load)(void*, long), + void (*post_load)(void*, long)); + +long elf_get_base_addr(void *file_addr); +long elf_get_base_addr32(void *file_addr); +long elf_get_base_addr64(void *file_addr); + +void elf_relocate64(void *file_addr, signed long offset); #endif /* __LIBELF_H */ -- cgit v1.1