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1da177e4 LT |
1 | /* Kernel module help for M32R. |
2 | ||
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
5 | the Free Software Foundation; either version 2 of the License, or | |
6 | (at your option) any later version. | |
7 | ||
8 | This program is distributed in the hope that it will be useful, | |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
12 | ||
13 | You should have received a copy of the GNU General Public License | |
14 | along with this program; if not, write to the Free Software | |
15 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
17 | ||
1da177e4 LT |
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 | ||
31 | void *module_alloc(unsigned long size) | |
32 | { | |
33 | if (size == 0) | |
34 | return NULL; | |
35 | #ifdef CONFIG_MMU | |
36 | return vmalloc_exec(size); | |
37 | #else | |
38 | return vmalloc(size); | |
39 | #endif | |
40 | } | |
41 | ||
42 | ||
43 | /* Free memory returned from module_alloc */ | |
44 | void module_free(struct module *mod, void *module_region) | |
45 | { | |
46 | vfree(module_region); | |
47 | /* FIXME: If module_region == mod->init_region, trim exception | |
48 | table entries. */ | |
49 | } | |
50 | ||
51 | /* We don't need anything special. */ | |
52 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
53 | Elf_Shdr *sechdrs, | |
54 | char *secstrings, | |
55 | struct module *mod) | |
56 | { | |
57 | return 0; | |
58 | } | |
59 | ||
60 | #define COPY_UNALIGNED_WORD(sw, tw, align) \ | |
61 | { \ | |
62 | void *__s = &(sw), *__t = &(tw); \ | |
63 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
64 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
65 | switch ((align)) \ | |
66 | { \ | |
67 | case 0: \ | |
68 | *(unsigned long *) __t = *(unsigned long *) __s; \ | |
69 | break; \ | |
70 | case 2: \ | |
71 | *__t2++ = *__s2++; \ | |
72 | *__t2 = *__s2; \ | |
73 | break; \ | |
74 | default: \ | |
75 | *__t1++ = *__s1++; \ | |
76 | *__t1++ = *__s1++; \ | |
77 | *__t1++ = *__s1++; \ | |
78 | *__t1 = *__s1; \ | |
79 | break; \ | |
80 | } \ | |
81 | } | |
82 | ||
83 | #define COPY_UNALIGNED_HWORD(sw, tw, align) \ | |
84 | { \ | |
85 | void *__s = &(sw), *__t = &(tw); \ | |
86 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
87 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
88 | switch ((align)) \ | |
89 | { \ | |
90 | case 0: \ | |
91 | *__t2 = *__s2; \ | |
92 | break; \ | |
93 | default: \ | |
94 | *__t1++ = *__s1++; \ | |
95 | *__t1 = *__s1; \ | |
96 | break; \ | |
97 | } \ | |
98 | } | |
99 | ||
100 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
101 | const char *strtab, | |
102 | unsigned int symindex, | |
103 | unsigned int relsec, | |
104 | struct module *me) | |
105 | { | |
106 | unsigned int i; | |
107 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
108 | Elf32_Sym *sym; | |
109 | Elf32_Addr relocation; | |
110 | uint32_t *location; | |
111 | uint32_t value; | |
112 | unsigned short *hlocation; | |
113 | unsigned short hvalue; | |
114 | int svalue; | |
115 | int align; | |
116 | ||
117 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
118 | sechdrs[relsec].sh_info); | |
119 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
120 | /* This is where to make the change */ | |
121 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
122 | + rel[i].r_offset; | |
123 | /* This is the symbol it is referring to. Note that all | |
124 | undefined symbols have been resolved. */ | |
125 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
126 | + ELF32_R_SYM(rel[i].r_info); | |
127 | relocation = sym->st_value + rel[i].r_addend; | |
128 | align = (int)location & 3; | |
129 | ||
130 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
131 | case R_M32R_32_RELA: | |
132 | COPY_UNALIGNED_WORD (*location, value, align); | |
133 | value += relocation; | |
134 | COPY_UNALIGNED_WORD (value, *location, align); | |
135 | break; | |
136 | case R_M32R_HI16_ULO_RELA: | |
137 | COPY_UNALIGNED_WORD (*location, value, align); | |
138 | relocation = (relocation >>16) & 0xffff; | |
139 | /* RELA must has 0 at relocation field. */ | |
140 | value += relocation; | |
141 | COPY_UNALIGNED_WORD (value, *location, align); | |
142 | break; | |
143 | case R_M32R_HI16_SLO_RELA: | |
144 | COPY_UNALIGNED_WORD (*location, value, align); | |
145 | if (relocation & 0x8000) relocation += 0x10000; | |
146 | relocation = (relocation >>16) & 0xffff; | |
147 | /* RELA must has 0 at relocation field. */ | |
148 | value += relocation; | |
149 | COPY_UNALIGNED_WORD (value, *location, align); | |
150 | break; | |
151 | case R_M32R_16_RELA: | |
152 | hlocation = (unsigned short *)location; | |
153 | relocation = relocation & 0xffff; | |
154 | /* RELA must has 0 at relocation field. */ | |
155 | hvalue = relocation; | |
156 | COPY_UNALIGNED_WORD (hvalue, *hlocation, align); | |
157 | break; | |
158 | case R_M32R_SDA16_RELA: | |
159 | case R_M32R_LO16_RELA: | |
160 | COPY_UNALIGNED_WORD (*location, value, align); | |
161 | relocation = relocation & 0xffff; | |
162 | /* RELA must has 0 at relocation field. */ | |
163 | value += relocation; | |
164 | COPY_UNALIGNED_WORD (value, *location, align); | |
165 | break; | |
166 | case R_M32R_24_RELA: | |
167 | COPY_UNALIGNED_WORD (*location, value, align); | |
168 | relocation = relocation & 0xffffff; | |
169 | /* RELA must has 0 at relocation field. */ | |
170 | value += relocation; | |
171 | COPY_UNALIGNED_WORD (value, *location, align); | |
172 | break; | |
173 | case R_M32R_18_PCREL_RELA: | |
174 | relocation = (relocation - (Elf32_Addr) location); | |
175 | if (relocation < -0x20000 || 0x1fffc < relocation) | |
176 | { | |
177 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
178 | me->name, relocation); | |
179 | return -ENOEXEC; | |
180 | } | |
181 | COPY_UNALIGNED_WORD (*location, value, align); | |
182 | if (value & 0xffff) | |
183 | { | |
184 | /* RELA must has 0 at relocation field. */ | |
185 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
186 | me->name, value); | |
187 | return -ENOEXEC; | |
188 | } | |
189 | relocation = (relocation >> 2) & 0xffff; | |
190 | value += relocation; | |
191 | COPY_UNALIGNED_WORD (value, *location, align); | |
192 | break; | |
193 | case R_M32R_10_PCREL_RELA: | |
194 | hlocation = (unsigned short *)location; | |
195 | relocation = (relocation - (Elf32_Addr) location); | |
196 | COPY_UNALIGNED_HWORD (*hlocation, hvalue, align); | |
197 | svalue = (int)hvalue; | |
198 | svalue = (signed char)svalue << 2; | |
199 | relocation += svalue; | |
200 | relocation = (relocation >> 2) & 0xff; | |
201 | hvalue = hvalue & 0xff00; | |
202 | hvalue += relocation; | |
203 | COPY_UNALIGNED_HWORD (hvalue, *hlocation, align); | |
204 | break; | |
205 | case R_M32R_26_PCREL_RELA: | |
206 | relocation = (relocation - (Elf32_Addr) location); | |
207 | if (relocation < -0x2000000 || 0x1fffffc < relocation) | |
208 | { | |
209 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
210 | me->name, relocation); | |
211 | return -ENOEXEC; | |
212 | } | |
213 | COPY_UNALIGNED_WORD (*location, value, align); | |
214 | if (value & 0xffffff) | |
215 | { | |
216 | /* RELA must has 0 at relocation field. */ | |
217 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
218 | me->name, value); | |
219 | return -ENOEXEC; | |
220 | } | |
221 | relocation = (relocation >> 2) & 0xffffff; | |
222 | value += relocation; | |
223 | COPY_UNALIGNED_WORD (value, *location, align); | |
224 | break; | |
225 | default: | |
226 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
227 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
228 | return -ENOEXEC; | |
229 | } | |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | int apply_relocate(Elf32_Shdr *sechdrs, | |
235 | const char *strtab, | |
236 | unsigned int symindex, | |
237 | unsigned int relsec, | |
238 | struct module *me) | |
239 | { | |
240 | #if 0 | |
241 | printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", | |
242 | me->name); | |
243 | return -ENOEXEC; | |
244 | #endif | |
245 | return 0; | |
246 | ||
247 | } | |
248 | ||
249 | int module_finalize(const Elf_Ehdr *hdr, | |
250 | const Elf_Shdr *sechdrs, | |
251 | struct module *me) | |
252 | { | |
253 | return 0; | |
254 | } | |
255 | ||
256 | void module_arch_cleanup(struct module *mod) | |
257 | { | |
258 | } |