1/*  Kernel module help for i386.
2    Copyright (C) 2001 Rusty Russell.
3
4    This program is free software; you can redistribute it and/or modify
5    it under the terms of the GNU General Public License as published by
6    the Free Software Foundation; either version 2 of the License, or
7    (at your option) any later version.
8
9    This program is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12    GNU General Public License for more details.
13
14    You should have received a copy of the GNU General Public License
15    along with this program; if not, write to the Free Software
16    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17*/
18#include <linux/moduleloader.h>
19#include <linux/elf.h>
20#include <linux/vmalloc.h>
21#include <linux/fs.h>
22#include <linux/string.h>
23#include <linux/kernel.h>
24#include <linux/slab.h>
25
26#if 0
27#define DEBUGP printk
28#else
29#define DEBUGP(fmt , ...)
30#endif
31
32#ifdef CONFIG_ETRAX_KMALLOCED_MODULES
33void *module_alloc(unsigned long size)
34{
35	return kmalloc(size, GFP_KERNEL);
36}
37
38/* Free memory returned from module_alloc */
39void module_memfree(void *module_region)
40{
41	kfree(module_region);
42}
43#endif
44
45int apply_relocate_add(Elf32_Shdr *sechdrs,
46		       const char *strtab,
47		       unsigned int symindex,
48		       unsigned int relsec,
49		       struct module *me)
50{
51  	unsigned int i;
52	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
53
54	DEBUGP ("Applying add relocate section %u to %u\n", relsec,
55		sechdrs[relsec].sh_info);
56
57	for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
58		/* This is where to make the change */
59		uint32_t *loc
60			= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
61			   + rela[i].r_offset);
62		/* This is the symbol it is referring to.  Note that all
63		   undefined symbols have been resolved.  */
64		Elf32_Sym *sym
65			= ((Elf32_Sym *)sechdrs[symindex].sh_addr
66			   + ELF32_R_SYM (rela[i].r_info));
67		switch (ELF32_R_TYPE(rela[i].r_info)) {
68		case R_CRIS_32:
69			*loc = sym->st_value + rela[i].r_addend;
70			break;
71		case R_CRIS_32_PCREL:
72			*loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
73			 break;
74		default:
75			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
76			       me->name, ELF32_R_TYPE(rela[i].r_info));
77			return -ENOEXEC;
78		}
79	}
80
81	return 0;
82}
83