blob: 11b867df8617dec4df64ce84078aa9e24a6fdc86 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
25#if 0
26#define DEBUGP printk
27#else
28#define DEBUGP(fmt , ...)
29#endif
30
31void *module_alloc(unsigned long size)
32{
33 if (size == 0)
34 return NULL;
Mikael Starvik5d01e6c2005-07-27 11:44:43 -070035 return vmalloc_exec(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036}
37
38
39/* Free memory returned from module_alloc */
40void module_free(struct module *mod, void *module_region)
41{
42 vfree(module_region);
43 /* FIXME: If module_region == mod->init_region, trim exception
44 table entries. */
45}
46
47/* We don't need anything special. */
48int module_frob_arch_sections(Elf_Ehdr *hdr,
49 Elf_Shdr *sechdrs,
50 char *secstrings,
51 struct module *mod)
52{
53 return 0;
54}
55
56int apply_relocate(Elf32_Shdr *sechdrs,
57 const char *strtab,
58 unsigned int symindex,
59 unsigned int relsec,
60 struct module *me)
61{
Mikael Starvik5d01e6c2005-07-27 11:44:43 -070062 printk(KERN_ERR "module %s: REL relocation unsupported\n", me->name);
63 return -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66int apply_relocate_add(Elf32_Shdr *sechdrs,
67 const char *strtab,
68 unsigned int symindex,
69 unsigned int relsec,
70 struct module *me)
71{
72 unsigned int i;
73 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
74
Mikael Starvik5d01e6c2005-07-27 11:44:43 -070075 DEBUGP ("Applying add relocate section %u to %u\n", relsec,
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 sechdrs[relsec].sh_info);
77
78 for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {
79 /* This is where to make the change */
80 uint32_t *loc
81 = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
82 + rela[i].r_offset);
83 /* This is the symbol it is referring to. Note that all
84 undefined symbols have been resolved. */
85 Elf32_Sym *sym
86 = ((Elf32_Sym *)sechdrs[symindex].sh_addr
87 + ELF32_R_SYM (rela[i].r_info));
Mikael Starvik5d01e6c2005-07-27 11:44:43 -070088 switch (ELF32_R_TYPE(rela[i].r_info)) {
89 case R_CRIS_32:
90 *loc = sym->st_value + rela[i].r_addend;
91 break;
92 case R_CRIS_32_PCREL:
93 *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4;
94 break;
95 default:
96 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
97 me->name, ELF32_R_TYPE(rela[i].r_info));
98 return -ENOEXEC;
99 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
101
102 return 0;
103}
104
105int module_finalize(const Elf_Ehdr *hdr,
106 const Elf_Shdr *sechdrs,
107 struct module *me)
108{
109 return 0;
110}
111
112void module_arch_cleanup(struct module *mod)
113{
114}