forked from Minki/linux
5a2bbb8f64
Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
|
|
* OpenRISC module.c
|
|
*
|
|
* Linux architectural port borrowing liberally from similar works of
|
|
* others. All original copyrights apply as per the original source
|
|
* declaration.
|
|
*
|
|
* Modifications for the OpenRISC architecture:
|
|
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
|
|
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;
|
|
uint32_t value;
|
|
|
|
pr_debug("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);
|
|
value = sym->st_value + rel[i].r_addend;
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_OR32_32:
|
|
*location = value;
|
|
break;
|
|
case R_OR32_CONST:
|
|
location = (uint16_t *)location + 1;
|
|
*((uint16_t *)location) = (uint16_t) (value);
|
|
break;
|
|
case R_OR32_CONSTH:
|
|
location = (uint16_t *)location + 1;
|
|
*((uint16_t *)location) = (uint16_t) (value >> 16);
|
|
break;
|
|
case R_OR32_JUMPTARG:
|
|
value -= (uint32_t)location;
|
|
value >>= 2;
|
|
value &= 0x03ffffff;
|
|
value |= *location & 0xfc000000;
|
|
*location = value;
|
|
break;
|
|
default:
|
|
pr_err("module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|