111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2008 Carsten Schlote <c.schlote@konzeptpark.de>
|
|
* See file CREDITS for list of people who contributed to this project.
|
|
*
|
|
* This file is part of barebox.
|
|
*
|
|
* barebox 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* barebox 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 barebox. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file
|
|
* Moduleloader Subsystem
|
|
*
|
|
* These relocation stubs are taken from Linux 2.6.10 They are used by the
|
|
* higher level ELF loader code to place ELF files to arbitrary addresses.
|
|
*/
|
|
#include <common.h>
|
|
#include <elf.h>
|
|
#include <module.h>
|
|
#include <errno.h>
|
|
|
|
int apply_relocate(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;
|
|
Elf32_Sym *sym;
|
|
uint32_t *location;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rel[i].r_info);
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_68K_32:
|
|
/* We add the value into the location given */
|
|
*location += sym->st_value;
|
|
break;
|
|
case R_68K_PC32:
|
|
/* Add the value, subtract its postition */
|
|
*location += sym->st_value - (uint32_t)location;
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int apply_relocate_add(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
|
|
Elf32_Sym *sym;
|
|
uint32_t *location;
|
|
|
|
DEBUGP("Applying relocate_add section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rel[i].r_info);
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_68K_32:
|
|
/* We add the value into the location given */
|
|
*location = rel[i].r_addend + sym->st_value;
|
|
break;
|
|
case R_68K_PC32:
|
|
/* Add the value, subtract its postition */
|
|
*location = rel[i].r_addend + sym->st_value - (uint32_t)location;
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|