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yaml
---
r: 258134
b: refs/heads/master
c: 5a2bbb8
h: refs/heads/master
v: v3
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Jonas Bonn committed Jul 22, 2011
1 parent 311eecd commit 0136737
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Showing 2 changed files with 73 additions and 1 deletion.
2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: e480158cc825b45eebcc2ff2ff5e5f7965c3875f
refs/heads/master: 5a2bbb8f64848b5cf9d626f3f17bac6718c91874
72 changes: 72 additions & 0 deletions trunk/arch/openrisc/kernel/module.c
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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.
*/

#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;
}

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