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-rw-r--r--arch/mn10300/kernel/module.c206
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diff --git a/arch/mn10300/kernel/module.c b/arch/mn10300/kernel/module.c
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1/* MN10300 Kernel module helper routines
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by Mark Salter (msalter@redhat.com)
5 * - Derived from arch/i386/kernel/module.c
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public Licence as published by
9 * the Free Software Foundation; either version 2 of the Licence, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public Licence for more details.
16 *
17 * You should have received a copy of the GNU General Public Licence
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/moduleloader.h>
22#include <linux/elf.h>
23#include <linux/vmalloc.h>
24#include <linux/fs.h>
25#include <linux/string.h>
26#include <linux/kernel.h>
27
28#if 0
29#define DEBUGP printk
30#else
31#define DEBUGP(fmt, ...)
32#endif
33
34/*
35 * allocate storage for a module
36 */
37void *module_alloc(unsigned long size)
38{
39 if (size == 0)
40 return NULL;
41 return vmalloc_exec(size);
42}
43
44/*
45 * free memory returned from module_alloc()
46 */
47void module_free(struct module *mod, void *module_region)
48{
49 vfree(module_region);
50 /* FIXME: If module_region == mod->init_region, trim exception
51 * table entries. */
52}
53
54/*
55 * allow the arch to fix up the section table
56 * - we don't need anything special
57 */
58int module_frob_arch_sections(Elf_Ehdr *hdr,
59 Elf_Shdr *sechdrs,
60 char *secstrings,
61 struct module *mod)
62{
63 return 0;
64}
65
66static uint32_t reloc_get16(uint8_t *p)
67{
68 return p[0] | (p[1] << 8);
69}
70
71static uint32_t reloc_get24(uint8_t *p)
72{
73 return reloc_get16(p) | (p[2] << 16);
74}
75
76static uint32_t reloc_get32(uint8_t *p)
77{
78 return reloc_get16(p) | (reloc_get16(p+2) << 16);
79}
80
81static void reloc_put16(uint8_t *p, uint32_t val)
82{
83 p[0] = val & 0xff;
84 p[1] = (val >> 8) & 0xff;
85}
86
87static void reloc_put24(uint8_t *p, uint32_t val)
88{
89 reloc_put16(p, val);
90 p[2] = (val >> 16) & 0xff;
91}
92
93static void reloc_put32(uint8_t *p, uint32_t val)
94{
95 reloc_put16(p, val);
96 reloc_put16(p+2, val >> 16);
97}
98
99/*
100 * apply a REL relocation
101 */
102int apply_relocate(Elf32_Shdr *sechdrs,
103 const char *strtab,
104 unsigned int symindex,
105 unsigned int relsec,
106 struct module *me)
107{
108 printk(KERN_ERR "module %s: RELOCATION unsupported\n",
109 me->name);
110 return -ENOEXEC;
111}
112
113/*
114 * apply a RELA relocation
115 */
116int apply_relocate_add(Elf32_Shdr *sechdrs,
117 const char *strtab,
118 unsigned int symindex,
119 unsigned int relsec,
120 struct module *me)
121{
122 unsigned int i;
123 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
124 Elf32_Sym *sym;
125 Elf32_Addr relocation;
126 uint8_t *location;
127 uint32_t value;
128
129 DEBUGP("Applying relocate section %u to %u\n",
130 relsec, sechdrs[relsec].sh_info);
131
132 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
133 /* this is where to make the change */
134 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
135 + rel[i].r_offset;
136
137 /* this is the symbol the relocation is referring to (note that
138 * all undefined symbols have been resolved by the caller) */
139 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
140 + ELF32_R_SYM(rel[i].r_info);
141
142 /* this is the adjustment to be made */
143 relocation = sym->st_value + rel[i].r_addend;
144
145 switch (ELF32_R_TYPE(rel[i].r_info)) {
146 /* for the first four relocation types, we add the
147 * adjustment into the value at the location given */
148 case R_MN10300_32:
149 value = reloc_get32(location);
150 value += relocation;
151 reloc_put32(location, value);
152 break;
153 case R_MN10300_24:
154 value = reloc_get24(location);
155 value += relocation;
156 reloc_put24(location, value);
157 break;
158 case R_MN10300_16:
159 value = reloc_get16(location);
160 value += relocation;
161 reloc_put16(location, value);
162 break;
163 case R_MN10300_8:
164 *location += relocation;
165 break;
166
167 /* for the next three relocation types, we write the
168 * adjustment with the address subtracted over the
169 * value at the location given */
170 case R_MN10300_PCREL32:
171 value = relocation - (uint32_t) location;
172 reloc_put32(location, value);
173 break;
174 case R_MN10300_PCREL16:
175 value = relocation - (uint32_t) location;
176 reloc_put16(location, value);
177 break;
178 case R_MN10300_PCREL8:
179 *location = relocation - (uint32_t) location;
180 break;
181
182 default:
183 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
184 me->name, ELF32_R_TYPE(rel[i].r_info));
185 return -ENOEXEC;
186 }
187 }
188 return 0;
189}
190
191/*
192 * finish loading the module
193 */
194int module_finalize(const Elf_Ehdr *hdr,
195 const Elf_Shdr *sechdrs,
196 struct module *me)
197{
198 return 0;
199}
200
201/*
202 * finish clearing the module
203 */
204void module_arch_cleanup(struct module *mod)
205{
206}
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