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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 | ||
18 | #include <linux/config.h> | |
19 | #include <linux/moduleloader.h> | |
20 | #include <linux/elf.h> | |
21 | #include <linux/vmalloc.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/kernel.h> | |
25 | ||
26 | #if 0 | |
27 | #define DEBUGP printk | |
28 | #else | |
29 | #define DEBUGP(fmt...) | |
30 | #endif | |
31 | ||
32 | void *module_alloc(unsigned long size) | |
33 | { | |
34 | if (size == 0) | |
35 | return NULL; | |
36 | #ifdef CONFIG_MMU | |
37 | return vmalloc_exec(size); | |
38 | #else | |
39 | return vmalloc(size); | |
40 | #endif | |
41 | } | |
42 | ||
43 | ||
44 | /* Free memory returned from module_alloc */ | |
45 | void module_free(struct module *mod, void *module_region) | |
46 | { | |
47 | vfree(module_region); | |
48 | /* FIXME: If module_region == mod->init_region, trim exception | |
49 | table entries. */ | |
50 | } | |
51 | ||
52 | /* We don't need anything special. */ | |
53 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
54 | Elf_Shdr *sechdrs, | |
55 | char *secstrings, | |
56 | struct module *mod) | |
57 | { | |
58 | return 0; | |
59 | } | |
60 | ||
61 | #define COPY_UNALIGNED_WORD(sw, tw, align) \ | |
62 | { \ | |
63 | void *__s = &(sw), *__t = &(tw); \ | |
64 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
65 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
66 | switch ((align)) \ | |
67 | { \ | |
68 | case 0: \ | |
69 | *(unsigned long *) __t = *(unsigned long *) __s; \ | |
70 | break; \ | |
71 | case 2: \ | |
72 | *__t2++ = *__s2++; \ | |
73 | *__t2 = *__s2; \ | |
74 | break; \ | |
75 | default: \ | |
76 | *__t1++ = *__s1++; \ | |
77 | *__t1++ = *__s1++; \ | |
78 | *__t1++ = *__s1++; \ | |
79 | *__t1 = *__s1; \ | |
80 | break; \ | |
81 | } \ | |
82 | } | |
83 | ||
84 | #define COPY_UNALIGNED_HWORD(sw, tw, align) \ | |
85 | { \ | |
86 | void *__s = &(sw), *__t = &(tw); \ | |
87 | unsigned short *__s2 = __s, *__t2 =__t; \ | |
88 | unsigned char *__s1 = __s, *__t1 =__t; \ | |
89 | switch ((align)) \ | |
90 | { \ | |
91 | case 0: \ | |
92 | *__t2 = *__s2; \ | |
93 | break; \ | |
94 | default: \ | |
95 | *__t1++ = *__s1++; \ | |
96 | *__t1 = *__s1; \ | |
97 | break; \ | |
98 | } \ | |
99 | } | |
100 | ||
101 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
102 | const char *strtab, | |
103 | unsigned int symindex, | |
104 | unsigned int relsec, | |
105 | struct module *me) | |
106 | { | |
107 | unsigned int i; | |
108 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
109 | Elf32_Sym *sym; | |
110 | Elf32_Addr relocation; | |
111 | uint32_t *location; | |
112 | uint32_t value; | |
113 | unsigned short *hlocation; | |
114 | unsigned short hvalue; | |
115 | int svalue; | |
116 | int align; | |
117 | ||
118 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
119 | sechdrs[relsec].sh_info); | |
120 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
121 | /* This is where to make the change */ | |
122 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
123 | + rel[i].r_offset; | |
124 | /* This is the symbol it is referring to. Note that all | |
125 | undefined symbols have been resolved. */ | |
126 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
127 | + ELF32_R_SYM(rel[i].r_info); | |
128 | relocation = sym->st_value + rel[i].r_addend; | |
129 | align = (int)location & 3; | |
130 | ||
131 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
132 | case R_M32R_32_RELA: | |
133 | COPY_UNALIGNED_WORD (*location, value, align); | |
134 | value += relocation; | |
135 | COPY_UNALIGNED_WORD (value, *location, align); | |
136 | break; | |
137 | case R_M32R_HI16_ULO_RELA: | |
138 | COPY_UNALIGNED_WORD (*location, value, align); | |
139 | relocation = (relocation >>16) & 0xffff; | |
140 | /* RELA must has 0 at relocation field. */ | |
141 | value += relocation; | |
142 | COPY_UNALIGNED_WORD (value, *location, align); | |
143 | break; | |
144 | case R_M32R_HI16_SLO_RELA: | |
145 | COPY_UNALIGNED_WORD (*location, value, align); | |
146 | if (relocation & 0x8000) relocation += 0x10000; | |
147 | relocation = (relocation >>16) & 0xffff; | |
148 | /* RELA must has 0 at relocation field. */ | |
149 | value += relocation; | |
150 | COPY_UNALIGNED_WORD (value, *location, align); | |
151 | break; | |
152 | case R_M32R_16_RELA: | |
153 | hlocation = (unsigned short *)location; | |
154 | relocation = relocation & 0xffff; | |
155 | /* RELA must has 0 at relocation field. */ | |
156 | hvalue = relocation; | |
157 | COPY_UNALIGNED_WORD (hvalue, *hlocation, align); | |
158 | break; | |
159 | case R_M32R_SDA16_RELA: | |
160 | case R_M32R_LO16_RELA: | |
161 | COPY_UNALIGNED_WORD (*location, value, align); | |
162 | relocation = relocation & 0xffff; | |
163 | /* RELA must has 0 at relocation field. */ | |
164 | value += relocation; | |
165 | COPY_UNALIGNED_WORD (value, *location, align); | |
166 | break; | |
167 | case R_M32R_24_RELA: | |
168 | COPY_UNALIGNED_WORD (*location, value, align); | |
169 | relocation = relocation & 0xffffff; | |
170 | /* RELA must has 0 at relocation field. */ | |
171 | value += relocation; | |
172 | COPY_UNALIGNED_WORD (value, *location, align); | |
173 | break; | |
174 | case R_M32R_18_PCREL_RELA: | |
175 | relocation = (relocation - (Elf32_Addr) location); | |
176 | if (relocation < -0x20000 || 0x1fffc < relocation) | |
177 | { | |
178 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
179 | me->name, relocation); | |
180 | return -ENOEXEC; | |
181 | } | |
182 | COPY_UNALIGNED_WORD (*location, value, align); | |
183 | if (value & 0xffff) | |
184 | { | |
185 | /* RELA must has 0 at relocation field. */ | |
186 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
187 | me->name, value); | |
188 | return -ENOEXEC; | |
189 | } | |
190 | relocation = (relocation >> 2) & 0xffff; | |
191 | value += relocation; | |
192 | COPY_UNALIGNED_WORD (value, *location, align); | |
193 | break; | |
194 | case R_M32R_10_PCREL_RELA: | |
195 | hlocation = (unsigned short *)location; | |
196 | relocation = (relocation - (Elf32_Addr) location); | |
197 | COPY_UNALIGNED_HWORD (*hlocation, hvalue, align); | |
198 | svalue = (int)hvalue; | |
199 | svalue = (signed char)svalue << 2; | |
200 | relocation += svalue; | |
201 | relocation = (relocation >> 2) & 0xff; | |
202 | hvalue = hvalue & 0xff00; | |
203 | hvalue += relocation; | |
204 | COPY_UNALIGNED_HWORD (hvalue, *hlocation, align); | |
205 | break; | |
206 | case R_M32R_26_PCREL_RELA: | |
207 | relocation = (relocation - (Elf32_Addr) location); | |
208 | if (relocation < -0x2000000 || 0x1fffffc < relocation) | |
209 | { | |
210 | printk(KERN_ERR "module %s: relocation overflow: %u\n", | |
211 | me->name, relocation); | |
212 | return -ENOEXEC; | |
213 | } | |
214 | COPY_UNALIGNED_WORD (*location, value, align); | |
215 | if (value & 0xffffff) | |
216 | { | |
217 | /* RELA must has 0 at relocation field. */ | |
218 | printk(KERN_ERR "module %s: illegal relocation field: %u\n", | |
219 | me->name, value); | |
220 | return -ENOEXEC; | |
221 | } | |
222 | relocation = (relocation >> 2) & 0xffffff; | |
223 | value += relocation; | |
224 | COPY_UNALIGNED_WORD (value, *location, align); | |
225 | break; | |
226 | default: | |
227 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
228 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
229 | return -ENOEXEC; | |
230 | } | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | ||
235 | int apply_relocate(Elf32_Shdr *sechdrs, | |
236 | const char *strtab, | |
237 | unsigned int symindex, | |
238 | unsigned int relsec, | |
239 | struct module *me) | |
240 | { | |
241 | #if 0 | |
242 | printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", | |
243 | me->name); | |
244 | return -ENOEXEC; | |
245 | #endif | |
246 | return 0; | |
247 | ||
248 | } | |
249 | ||
250 | int module_finalize(const Elf_Ehdr *hdr, | |
251 | const Elf_Shdr *sechdrs, | |
252 | struct module *me) | |
253 | { | |
254 | return 0; | |
255 | } | |
256 | ||
257 | void module_arch_cleanup(struct module *mod) | |
258 | { | |
259 | } |