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b920de1b DH |
1 | /* MN10300 Kernel module helper routines |
2 | * | |
1122b19b | 3 | * Copyright (C) 2007, 2008 Red Hat, Inc. All Rights Reserved. |
b920de1b DH |
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> | |
18f6db95 | 27 | #include <linux/bug.h> |
b920de1b DH |
28 | |
29 | #if 0 | |
30 | #define DEBUGP printk | |
31 | #else | |
32 | #define DEBUGP(fmt, ...) | |
33 | #endif | |
34 | ||
35 | /* | |
36 | * allocate storage for a module | |
37 | */ | |
38 | void *module_alloc(unsigned long size) | |
39 | { | |
40 | if (size == 0) | |
41 | return NULL; | |
42 | return vmalloc_exec(size); | |
43 | } | |
44 | ||
45 | /* | |
46 | * free memory returned from module_alloc() | |
47 | */ | |
48 | void module_free(struct module *mod, void *module_region) | |
49 | { | |
50 | vfree(module_region); | |
51 | /* FIXME: If module_region == mod->init_region, trim exception | |
52 | * table entries. */ | |
53 | } | |
54 | ||
55 | /* | |
56 | * allow the arch to fix up the section table | |
57 | * - we don't need anything special | |
58 | */ | |
59 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
60 | Elf_Shdr *sechdrs, | |
61 | char *secstrings, | |
62 | struct module *mod) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | ||
b920de1b DH |
67 | static void reloc_put16(uint8_t *p, uint32_t val) |
68 | { | |
69 | p[0] = val & 0xff; | |
70 | p[1] = (val >> 8) & 0xff; | |
71 | } | |
72 | ||
73 | static void reloc_put24(uint8_t *p, uint32_t val) | |
74 | { | |
75 | reloc_put16(p, val); | |
76 | p[2] = (val >> 16) & 0xff; | |
77 | } | |
78 | ||
79 | static void reloc_put32(uint8_t *p, uint32_t val) | |
80 | { | |
81 | reloc_put16(p, val); | |
82 | reloc_put16(p+2, val >> 16); | |
83 | } | |
84 | ||
85 | /* | |
86 | * apply a REL relocation | |
87 | */ | |
88 | int apply_relocate(Elf32_Shdr *sechdrs, | |
89 | const char *strtab, | |
90 | unsigned int symindex, | |
91 | unsigned int relsec, | |
92 | struct module *me) | |
93 | { | |
94 | printk(KERN_ERR "module %s: RELOCATION unsupported\n", | |
95 | me->name); | |
96 | return -ENOEXEC; | |
97 | } | |
98 | ||
99 | /* | |
100 | * apply a RELA relocation | |
101 | */ | |
102 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
103 | const char *strtab, | |
104 | unsigned int symindex, | |
105 | unsigned int relsec, | |
106 | struct module *me) | |
107 | { | |
108 | unsigned int i; | |
109 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
110 | Elf32_Sym *sym; | |
111 | Elf32_Addr relocation; | |
112 | uint8_t *location; | |
113 | uint32_t value; | |
114 | ||
115 | DEBUGP("Applying relocate section %u to %u\n", | |
116 | relsec, sechdrs[relsec].sh_info); | |
117 | ||
118 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
119 | /* this is where to make the change */ | |
120 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
121 | + rel[i].r_offset; | |
122 | ||
123 | /* this is the symbol the relocation is referring to (note that | |
124 | * all undefined symbols have been resolved by the caller) */ | |
125 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
126 | + ELF32_R_SYM(rel[i].r_info); | |
127 | ||
128 | /* this is the adjustment to be made */ | |
129 | relocation = sym->st_value + rel[i].r_addend; | |
130 | ||
131 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
1122b19b MS |
132 | /* for the first four relocation types, we simply |
133 | * store the adjustment at the location given */ | |
b920de1b | 134 | case R_MN10300_32: |
1122b19b | 135 | reloc_put32(location, relocation); |
b920de1b DH |
136 | break; |
137 | case R_MN10300_24: | |
1122b19b | 138 | reloc_put24(location, relocation); |
b920de1b DH |
139 | break; |
140 | case R_MN10300_16: | |
1122b19b | 141 | reloc_put16(location, relocation); |
b920de1b DH |
142 | break; |
143 | case R_MN10300_8: | |
1122b19b | 144 | *location = relocation; |
b920de1b DH |
145 | break; |
146 | ||
147 | /* for the next three relocation types, we write the | |
148 | * adjustment with the address subtracted over the | |
149 | * value at the location given */ | |
150 | case R_MN10300_PCREL32: | |
151 | value = relocation - (uint32_t) location; | |
152 | reloc_put32(location, value); | |
153 | break; | |
154 | case R_MN10300_PCREL16: | |
155 | value = relocation - (uint32_t) location; | |
156 | reloc_put16(location, value); | |
157 | break; | |
158 | case R_MN10300_PCREL8: | |
159 | *location = relocation - (uint32_t) location; | |
160 | break; | |
161 | ||
162 | default: | |
163 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
164 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
165 | return -ENOEXEC; | |
166 | } | |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* | |
172 | * finish loading the module | |
173 | */ | |
174 | int module_finalize(const Elf_Ehdr *hdr, | |
175 | const Elf_Shdr *sechdrs, | |
176 | struct module *me) | |
177 | { | |
18f6db95 | 178 | return module_bug_finalize(hdr, sechdrs, me); |
b920de1b DH |
179 | } |
180 | ||
181 | /* | |
182 | * finish clearing the module | |
183 | */ | |
184 | void module_arch_cleanup(struct module *mod) | |
185 | { | |
18f6db95 | 186 | module_bug_cleanup(mod); |
b920de1b | 187 | } |