Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: arch/blackfin/kernel/module.c |
| 3 | * Based on: |
| 4 | * Author: |
| 5 | * |
| 6 | * Created: |
| 7 | * Description: |
| 8 | * |
| 9 | * Modified: |
| 10 | * Copyright 2004-2006 Analog Devices Inc. |
| 11 | * |
| 12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, see the file COPYING, or write |
| 26 | * to the Free Software Foundation, Inc., |
| 27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 28 | */ |
| 29 | |
| 30 | |
| 31 | #include <linux/moduleloader.h> |
| 32 | #include <linux/elf.h> |
| 33 | #include <linux/vmalloc.h> |
| 34 | #include <linux/fs.h> |
| 35 | #include <linux/string.h> |
| 36 | #include <linux/kernel.h> |
| 37 | #include <asm/dma.h> |
| 38 | #include <asm/cacheflush.h> |
| 39 | |
| 40 | /* |
| 41 | * handle arithmetic relocations. |
| 42 | * See binutils/bfd/elf32-bfin.c for more details |
| 43 | */ |
| 44 | #define RELOC_STACK_SIZE 100 |
| 45 | static uint32_t reloc_stack[RELOC_STACK_SIZE]; |
| 46 | static unsigned int reloc_stack_tos; |
| 47 | |
| 48 | #define is_reloc_stack_empty() ((reloc_stack_tos > 0)?0:1) |
| 49 | |
| 50 | static void reloc_stack_push(uint32_t value) |
| 51 | { |
| 52 | reloc_stack[reloc_stack_tos++] = value; |
| 53 | } |
| 54 | |
| 55 | static uint32_t reloc_stack_pop(void) |
| 56 | { |
| 57 | return reloc_stack[--reloc_stack_tos]; |
| 58 | } |
| 59 | |
| 60 | static uint32_t reloc_stack_operate(unsigned int oper, struct module *mod) |
| 61 | { |
| 62 | uint32_t value; |
| 63 | |
| 64 | switch (oper) { |
| 65 | case R_add: |
| 66 | value = reloc_stack[reloc_stack_tos - 2] + |
| 67 | reloc_stack[reloc_stack_tos - 1]; |
| 68 | reloc_stack_tos -= 2; |
| 69 | break; |
| 70 | case R_sub: |
| 71 | value = reloc_stack[reloc_stack_tos - 2] - |
| 72 | reloc_stack[reloc_stack_tos - 1]; |
| 73 | reloc_stack_tos -= 2; |
| 74 | break; |
| 75 | case R_mult: |
| 76 | value = reloc_stack[reloc_stack_tos - 2] * |
| 77 | reloc_stack[reloc_stack_tos - 1]; |
| 78 | reloc_stack_tos -= 2; |
| 79 | break; |
| 80 | case R_div: |
| 81 | value = reloc_stack[reloc_stack_tos - 2] / |
| 82 | reloc_stack[reloc_stack_tos - 1]; |
| 83 | reloc_stack_tos -= 2; |
| 84 | break; |
| 85 | case R_mod: |
| 86 | value = reloc_stack[reloc_stack_tos - 2] % |
| 87 | reloc_stack[reloc_stack_tos - 1]; |
| 88 | reloc_stack_tos -= 2; |
| 89 | break; |
| 90 | case R_lshift: |
| 91 | value = reloc_stack[reloc_stack_tos - 2] << |
| 92 | reloc_stack[reloc_stack_tos - 1]; |
| 93 | reloc_stack_tos -= 2; |
| 94 | break; |
| 95 | case R_rshift: |
| 96 | value = reloc_stack[reloc_stack_tos - 2] >> |
| 97 | reloc_stack[reloc_stack_tos - 1]; |
| 98 | reloc_stack_tos -= 2; |
| 99 | break; |
| 100 | case R_and: |
| 101 | value = reloc_stack[reloc_stack_tos - 2] & |
| 102 | reloc_stack[reloc_stack_tos - 1]; |
| 103 | reloc_stack_tos -= 2; |
| 104 | break; |
| 105 | case R_or: |
| 106 | value = reloc_stack[reloc_stack_tos - 2] | |
| 107 | reloc_stack[reloc_stack_tos - 1]; |
| 108 | reloc_stack_tos -= 2; |
| 109 | break; |
| 110 | case R_xor: |
| 111 | value = reloc_stack[reloc_stack_tos - 2] ^ |
| 112 | reloc_stack[reloc_stack_tos - 1]; |
| 113 | reloc_stack_tos -= 2; |
| 114 | break; |
| 115 | case R_land: |
| 116 | value = reloc_stack[reloc_stack_tos - 2] && |
| 117 | reloc_stack[reloc_stack_tos - 1]; |
| 118 | reloc_stack_tos -= 2; |
| 119 | break; |
| 120 | case R_lor: |
| 121 | value = reloc_stack[reloc_stack_tos - 2] || |
| 122 | reloc_stack[reloc_stack_tos - 1]; |
| 123 | reloc_stack_tos -= 2; |
| 124 | break; |
| 125 | case R_neg: |
| 126 | value = -reloc_stack[reloc_stack_tos - 1]; |
| 127 | reloc_stack_tos--; |
| 128 | break; |
| 129 | case R_comp: |
| 130 | value = ~reloc_stack[reloc_stack_tos - 1]; |
| 131 | reloc_stack_tos -= 1; |
| 132 | break; |
| 133 | default: |
| 134 | printk(KERN_WARNING "module %s: unhandled reloction\n", |
| 135 | mod->name); |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | /* now push the new value back on stack */ |
| 140 | reloc_stack_push(value); |
| 141 | |
| 142 | return value; |
| 143 | } |
| 144 | |
| 145 | void *module_alloc(unsigned long size) |
| 146 | { |
| 147 | if (size == 0) |
| 148 | return NULL; |
| 149 | return vmalloc(size); |
| 150 | } |
| 151 | |
| 152 | /* Free memory returned from module_alloc */ |
| 153 | void module_free(struct module *mod, void *module_region) |
| 154 | { |
| 155 | vfree(module_region); |
| 156 | } |
| 157 | |
| 158 | /* Transfer the section to the L1 memory */ |
| 159 | int |
| 160 | module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs, |
| 161 | char *secstrings, struct module *mod) |
| 162 | { |
| 163 | Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum; |
| 164 | void *dest = NULL; |
| 165 | |
| 166 | for (s = sechdrs; s < sechdrs_end; ++s) { |
| 167 | if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) || |
| 168 | ((strcmp(".text", secstrings + s->sh_name)==0) && |
| 169 | (hdr->e_flags & FLG_CODE_IN_L1) && (s->sh_size > 0))) { |
| 170 | mod->arch.text_l1 = s; |
| 171 | dest = l1_inst_sram_alloc(s->sh_size); |
| 172 | if (dest == NULL) { |
| 173 | printk(KERN_ERR |
| 174 | "module %s: L1 instruction memory allocation failed\n", |
| 175 | mod->name); |
| 176 | return -1; |
| 177 | } |
| 178 | dma_memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 179 | s->sh_flags &= ~SHF_ALLOC; |
| 180 | s->sh_addr = (unsigned long)dest; |
| 181 | } |
| 182 | if ((strcmp(".l1.data", secstrings + s->sh_name) == 0)|| |
| 183 | ((strcmp(".data", secstrings + s->sh_name)==0) && |
| 184 | (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) { |
| 185 | mod->arch.data_a_l1 = s; |
| 186 | dest = l1_data_sram_alloc(s->sh_size); |
| 187 | if (dest == NULL) { |
| 188 | printk(KERN_ERR |
| 189 | "module %s: L1 data memory allocation failed\n", |
| 190 | mod->name); |
| 191 | return -1; |
| 192 | } |
| 193 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 194 | s->sh_flags &= ~SHF_ALLOC; |
| 195 | s->sh_addr = (unsigned long)dest; |
| 196 | } |
| 197 | if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 || |
| 198 | ((strcmp(".bss", secstrings + s->sh_name)==0) && |
| 199 | (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) { |
| 200 | mod->arch.bss_a_l1 = s; |
| 201 | dest = l1_data_sram_alloc(s->sh_size); |
| 202 | if (dest == NULL) { |
| 203 | printk(KERN_ERR |
| 204 | "module %s: L1 data memory allocation failed\n", |
| 205 | mod->name); |
| 206 | return -1; |
| 207 | } |
| 208 | memset(dest, 0, s->sh_size); |
| 209 | s->sh_flags &= ~SHF_ALLOC; |
| 210 | s->sh_addr = (unsigned long)dest; |
| 211 | } |
| 212 | if (strcmp(".l1.data.B", secstrings + s->sh_name) == 0) { |
| 213 | mod->arch.data_b_l1 = s; |
| 214 | dest = l1_data_B_sram_alloc(s->sh_size); |
| 215 | if (dest == NULL) { |
| 216 | printk(KERN_ERR |
| 217 | "module %s: L1 data memory allocation failed\n", |
| 218 | mod->name); |
| 219 | return -1; |
| 220 | } |
| 221 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 222 | s->sh_flags &= ~SHF_ALLOC; |
| 223 | s->sh_addr = (unsigned long)dest; |
| 224 | } |
| 225 | if (strcmp(".l1.bss.B", secstrings + s->sh_name) == 0) { |
| 226 | mod->arch.bss_b_l1 = s; |
| 227 | dest = l1_data_B_sram_alloc(s->sh_size); |
| 228 | if (dest == NULL) { |
| 229 | printk(KERN_ERR |
| 230 | "module %s: L1 data memory allocation failed\n", |
| 231 | mod->name); |
| 232 | return -1; |
| 233 | } |
| 234 | memset(dest, 0, s->sh_size); |
| 235 | s->sh_flags &= ~SHF_ALLOC; |
| 236 | s->sh_addr = (unsigned long)dest; |
| 237 | } |
| 238 | } |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | int |
| 243 | apply_relocate(Elf_Shdr * sechdrs, const char *strtab, |
| 244 | unsigned int symindex, unsigned int relsec, struct module *me) |
| 245 | { |
| 246 | printk(KERN_ERR "module %s: .rel unsupported\n", me->name); |
| 247 | return -ENOEXEC; |
| 248 | } |
| 249 | |
| 250 | /*************************************************************************/ |
| 251 | /* FUNCTION : apply_relocate_add */ |
| 252 | /* ABSTRACT : Blackfin specific relocation handling for the loadable */ |
| 253 | /* modules. Modules are expected to be .o files. */ |
| 254 | /* Arithmetic relocations are handled. */ |
| 255 | /* We do not expect LSETUP to be split and hence is not */ |
| 256 | /* handled. */ |
| 257 | /* R_byte and R_byte2 are also not handled as the gas */ |
| 258 | /* does not generate it. */ |
| 259 | /*************************************************************************/ |
| 260 | int |
| 261 | apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab, |
| 262 | unsigned int symindex, unsigned int relsec, |
| 263 | struct module *mod) |
| 264 | { |
| 265 | unsigned int i; |
| 266 | unsigned short tmp; |
| 267 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 268 | Elf32_Sym *sym; |
| 269 | uint32_t *location32; |
| 270 | uint16_t *location16; |
| 271 | uint32_t value; |
| 272 | |
| 273 | pr_debug("Applying relocate section %u to %u\n", relsec, |
| 274 | sechdrs[relsec].sh_info); |
| 275 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 276 | /* This is where to make the change */ |
| 277 | location16 = |
| 278 | (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr + |
| 279 | rel[i].r_offset); |
| 280 | location32 = (uint32_t *) location16; |
| 281 | /* This is the symbol it is referring to. Note that all |
| 282 | undefined symbols have been resolved. */ |
| 283 | sym = (Elf32_Sym *) sechdrs[symindex].sh_addr |
| 284 | + ELF32_R_SYM(rel[i].r_info); |
| 285 | if (is_reloc_stack_empty()) { |
| 286 | value = sym->st_value; |
| 287 | } else { |
| 288 | value = reloc_stack_pop(); |
| 289 | } |
| 290 | value += rel[i].r_addend; |
| 291 | pr_debug("location is %x, value is %x type is %d \n", |
| 292 | (unsigned int) location32, value, |
| 293 | ELF32_R_TYPE(rel[i].r_info)); |
| 294 | |
| 295 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 296 | |
| 297 | case R_pcrel24: |
| 298 | case R_pcrel24_jump_l: |
| 299 | /* Add the value, subtract its postition */ |
| 300 | location16 = |
| 301 | (uint16_t *) (sechdrs[sechdrs[relsec].sh_info]. |
| 302 | sh_addr + rel[i].r_offset - 2); |
| 303 | location32 = (uint32_t *) location16; |
| 304 | value -= (uint32_t) location32; |
| 305 | value >>= 1; |
| 306 | pr_debug("value is %x, before %x-%x after %x-%x\n", value, |
| 307 | *location16, *(location16 + 1), |
| 308 | (*location16 & 0xff00) | (value >> 16 & 0x00ff), |
| 309 | value & 0xffff); |
| 310 | *location16 = |
| 311 | (*location16 & 0xff00) | (value >> 16 & 0x00ff); |
| 312 | *(location16 + 1) = value & 0xffff; |
| 313 | break; |
| 314 | case R_pcrel12_jump: |
| 315 | case R_pcrel12_jump_s: |
| 316 | value -= (uint32_t) location32; |
| 317 | value >>= 1; |
| 318 | *location16 = (value & 0xfff); |
| 319 | break; |
| 320 | case R_pcrel10: |
| 321 | value -= (uint32_t) location32; |
| 322 | value >>= 1; |
| 323 | *location16 = (value & 0x3ff); |
| 324 | break; |
| 325 | case R_luimm16: |
| 326 | pr_debug("before %x after %x\n", *location16, |
| 327 | (value & 0xffff)); |
| 328 | tmp = (value & 0xffff); |
| 329 | if((unsigned long)location16 >= L1_CODE_START) { |
| 330 | dma_memcpy(location16, &tmp, 2); |
| 331 | } else |
| 332 | *location16 = tmp; |
| 333 | break; |
| 334 | case R_huimm16: |
| 335 | pr_debug("before %x after %x\n", *location16, |
| 336 | ((value >> 16) & 0xffff)); |
| 337 | tmp = ((value >> 16) & 0xffff); |
| 338 | if((unsigned long)location16 >= L1_CODE_START) { |
| 339 | dma_memcpy(location16, &tmp, 2); |
| 340 | } else |
| 341 | *location16 = tmp; |
| 342 | break; |
| 343 | case R_rimm16: |
| 344 | *location16 = (value & 0xffff); |
| 345 | break; |
| 346 | case R_byte4_data: |
| 347 | pr_debug("before %x after %x\n", *location32, value); |
| 348 | *location32 = value; |
| 349 | break; |
| 350 | case R_push: |
| 351 | reloc_stack_push(value); |
| 352 | break; |
| 353 | case R_const: |
| 354 | reloc_stack_push(rel[i].r_addend); |
| 355 | break; |
| 356 | case R_add: |
| 357 | case R_sub: |
| 358 | case R_mult: |
| 359 | case R_div: |
| 360 | case R_mod: |
| 361 | case R_lshift: |
| 362 | case R_rshift: |
| 363 | case R_and: |
| 364 | case R_or: |
| 365 | case R_xor: |
| 366 | case R_land: |
| 367 | case R_lor: |
| 368 | case R_neg: |
| 369 | case R_comp: |
| 370 | reloc_stack_operate(ELF32_R_TYPE(rel[i].r_info), mod); |
| 371 | break; |
| 372 | default: |
| 373 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
| 374 | mod->name, ELF32_R_TYPE(rel[i].r_info)); |
| 375 | return -ENOEXEC; |
| 376 | } |
| 377 | } |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | int |
| 382 | module_finalize(const Elf_Ehdr * hdr, |
| 383 | const Elf_Shdr * sechdrs, struct module *mod) |
| 384 | { |
| 385 | unsigned int i, strindex = 0, symindex = 0; |
| 386 | char *secstrings; |
| 387 | |
| 388 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 389 | |
| 390 | for (i = 1; i < hdr->e_shnum; i++) { |
| 391 | /* Internal symbols and strings. */ |
| 392 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 393 | symindex = i; |
| 394 | strindex = sechdrs[i].sh_link; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | for (i = 1; i < hdr->e_shnum; i++) { |
| 399 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 400 | unsigned int info = sechdrs[i].sh_info; |
| 401 | |
| 402 | /* Not a valid relocation section? */ |
| 403 | if (info >= hdr->e_shnum) |
| 404 | continue; |
| 405 | |
| 406 | if ((sechdrs[i].sh_type == SHT_RELA) && |
| 407 | ((strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0)|| |
| 408 | ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) && |
| 409 | (hdr->e_flags & FLG_CODE_IN_L1)))) { |
| 410 | apply_relocate_add((Elf_Shdr *) sechdrs, strtab, |
| 411 | symindex, i, mod); |
| 412 | } |
| 413 | } |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | void module_arch_cleanup(struct module *mod) |
| 418 | { |
| 419 | if ((mod->arch.text_l1) && (mod->arch.text_l1->sh_addr)) |
| 420 | l1_inst_sram_free((void*)mod->arch.text_l1->sh_addr); |
| 421 | if ((mod->arch.data_a_l1) && (mod->arch.data_a_l1->sh_addr)) |
| 422 | l1_data_sram_free((void*)mod->arch.data_a_l1->sh_addr); |
| 423 | if ((mod->arch.bss_a_l1) && (mod->arch.bss_a_l1->sh_addr)) |
| 424 | l1_data_sram_free((void*)mod->arch.bss_a_l1->sh_addr); |
| 425 | if ((mod->arch.data_b_l1) && (mod->arch.data_b_l1->sh_addr)) |
| 426 | l1_data_B_sram_free((void*)mod->arch.data_b_l1->sh_addr); |
| 427 | if ((mod->arch.bss_b_l1) && (mod->arch.bss_b_l1->sh_addr)) |
| 428 | l1_data_B_sram_free((void*)mod->arch.bss_b_l1->sh_addr); |
| 429 | } |