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/* Elf object file loading and relocation routines.
Copyright 1996, 1997 Linux International.
Contributed by Richard Henderson <rth@tamu.edu>
This file is part of the Linux modutils.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef MODUTILS_OBJ_H
#define MODUTILS_OBJ_H 1
#ident "$Id: obj.h,v 1.2 1998/01/23 09:33:22 rth Exp $"
/* The relocatable object is manipulated using elfin types. */
#include <stdio.h>
#include <elf.h>
#include ELF_MACHINE_H
#ifndef ElfW
# if ELFCLASSM == ELFCLASS32
# define ElfW(x) Elf32_ ## x
# define ELFW(x) ELF32_ ## x
# else
# define ElfW(x) Elf64_ ## x
# define ELFW(x) ELF64_ ## x
# endif
#endif
/* For some reason this is missing from libc5. */
#ifndef ELF32_ST_INFO
# define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
#ifndef ELF64_ST_INFO
# define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
struct obj_string_patch;
struct obj_symbol_patch;
struct obj_section
{
ElfW(Shdr) header;
const char *name;
char *contents;
struct obj_section *load_next;
int idx;
};
struct obj_symbol
{
struct obj_symbol *next; /* hash table link */
const char *name;
unsigned long value;
unsigned long size;
int secidx; /* the defining section index/module */
int info;
int ksymidx; /* for export to the kernel symtab */
int referenced; /* actually used in the link */
};
/* Hardcode the hash table size. We shouldn't be needing so many
symbols that we begin to degrade performance, and we get a big win
by giving the compiler a constant divisor. */
#define HASH_BUCKETS 521
struct obj_file
{
ElfW(Ehdr) header;
ElfW(Addr) baseaddr;
struct obj_section **sections;
struct obj_section *load_order;
struct obj_section **load_order_search_start;
struct obj_string_patch *string_patches;
struct obj_symbol_patch *symbol_patches;
int (*symbol_cmp)(const char *, const char *);
unsigned long (*symbol_hash)(const char *);
unsigned long local_symtab_size;
struct obj_symbol **local_symtab;
struct obj_symbol *symtab[HASH_BUCKETS];
};
enum obj_reloc
{
obj_reloc_ok,
obj_reloc_overflow,
obj_reloc_dangerous,
obj_reloc_unhandled
};
struct obj_string_patch
{
struct obj_string_patch *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
ElfW(Addr) string_offset;
};
struct obj_symbol_patch
{
struct obj_symbol_patch *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
struct obj_symbol *sym;
};
/* Generic object manipulation routines. */
unsigned long obj_elf_hash(const char *);
unsigned long obj_elf_hash_n(const char *, unsigned long len);
struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name,
unsigned long symidx, int info, int secidx,
ElfW(Addr) value, unsigned long size);
struct obj_symbol *obj_find_symbol (struct obj_file *f,
const char *name);
ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
struct obj_symbol *sym);
void obj_set_symbol_compare(struct obj_file *f,
int (*cmp)(const char *, const char *),
unsigned long (*hash)(const char *));
struct obj_section *obj_find_section (struct obj_file *f,
const char *name);
void obj_insert_section_load_order (struct obj_file *f,
struct obj_section *sec);
struct obj_section *obj_create_alloced_section (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
struct obj_section *obj_create_alloced_section_first (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
void *obj_extend_section (struct obj_section *sec, unsigned long more);
int obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
const char *string);
int obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
struct obj_symbol *sym);
int obj_check_undefineds(struct obj_file *f);
void obj_allocate_commons(struct obj_file *f);
unsigned long obj_load_size (struct obj_file *f);
int obj_relocate (struct obj_file *f, ElfW(Addr) base);
struct obj_file *obj_load(FILE *f);
int obj_create_image (struct obj_file *f, char *image);
/* Architecture specific manipulation routines. */
struct obj_file *arch_new_file (void);
struct obj_section *arch_new_section (void);
struct obj_symbol *arch_new_symbol (void);
enum obj_reloc arch_apply_relocation (struct obj_file *f,
struct obj_section *targsec,
struct obj_section *symsec,
struct obj_symbol *sym,
ElfW(RelM) *rel, ElfW(Addr) value);
int arch_create_got (struct obj_file *f);
struct new_module;
int arch_init_module (struct obj_file *f, struct new_module *);
#endif /* obj.h */
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