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Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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Jonas Bonn
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Jul 22, 2011
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/* | ||
* 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. | ||
*/ | ||
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#include <linux/moduleloader.h> | ||
#include <linux/elf.h> | ||
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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; | ||
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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; | ||
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/* 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; | ||
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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; | ||
} | ||
} | ||
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return 0; | ||
} |