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 | |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 40 | void *module_alloc(unsigned long size) |
| 41 | { |
| 42 | if (size == 0) |
| 43 | return NULL; |
| 44 | return vmalloc(size); |
| 45 | } |
| 46 | |
| 47 | /* Free memory returned from module_alloc */ |
| 48 | void module_free(struct module *mod, void *module_region) |
| 49 | { |
| 50 | vfree(module_region); |
| 51 | } |
| 52 | |
| 53 | /* Transfer the section to the L1 memory */ |
| 54 | int |
| 55 | module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs, |
| 56 | char *secstrings, struct module *mod) |
| 57 | { |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 58 | /* |
| 59 | * XXX: sechdrs are vmalloced in kernel/module.c |
| 60 | * and would be vfreed just after module is loaded, |
| 61 | * so we hack to keep the only information we needed |
| 62 | * in mod->arch to correctly free L1 I/D sram later. |
| 63 | * NOTE: this breaks the semantic of mod->arch structure. |
| 64 | */ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 65 | Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum; |
| 66 | void *dest = NULL; |
| 67 | |
| 68 | for (s = sechdrs; s < sechdrs_end; ++s) { |
| 69 | if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) || |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 70 | ((strcmp(".text", secstrings + s->sh_name) == 0) && |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 71 | (hdr->e_flags & EF_BFIN_CODE_IN_L1) && (s->sh_size > 0))) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 72 | dest = l1_inst_sram_alloc(s->sh_size); |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 73 | mod->arch.text_l1 = dest; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 74 | if (dest == NULL) { |
| 75 | printk(KERN_ERR |
| 76 | "module %s: L1 instruction memory allocation failed\n", |
| 77 | mod->name); |
| 78 | return -1; |
| 79 | } |
| 80 | dma_memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 81 | s->sh_flags &= ~SHF_ALLOC; |
| 82 | s->sh_addr = (unsigned long)dest; |
| 83 | } |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 84 | if ((strcmp(".l1.data", secstrings + s->sh_name) == 0) || |
| 85 | ((strcmp(".data", secstrings + s->sh_name) == 0) && |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 86 | (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 87 | dest = l1_data_sram_alloc(s->sh_size); |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 88 | mod->arch.data_a_l1 = dest; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 89 | if (dest == NULL) { |
| 90 | printk(KERN_ERR |
| 91 | "module %s: L1 data memory allocation failed\n", |
| 92 | mod->name); |
| 93 | return -1; |
| 94 | } |
| 95 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 96 | s->sh_flags &= ~SHF_ALLOC; |
| 97 | s->sh_addr = (unsigned long)dest; |
| 98 | } |
| 99 | if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 || |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 100 | ((strcmp(".bss", secstrings + s->sh_name) == 0) && |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 101 | (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 102 | dest = l1_data_sram_alloc(s->sh_size); |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 103 | mod->arch.bss_a_l1 = dest; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 104 | if (dest == NULL) { |
| 105 | printk(KERN_ERR |
| 106 | "module %s: L1 data memory allocation failed\n", |
| 107 | mod->name); |
| 108 | return -1; |
| 109 | } |
| 110 | memset(dest, 0, s->sh_size); |
| 111 | s->sh_flags &= ~SHF_ALLOC; |
| 112 | s->sh_addr = (unsigned long)dest; |
| 113 | } |
| 114 | if (strcmp(".l1.data.B", secstrings + s->sh_name) == 0) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 115 | dest = l1_data_B_sram_alloc(s->sh_size); |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 116 | mod->arch.data_b_l1 = dest; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 117 | if (dest == NULL) { |
| 118 | printk(KERN_ERR |
| 119 | "module %s: L1 data memory allocation failed\n", |
| 120 | mod->name); |
| 121 | return -1; |
| 122 | } |
| 123 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 124 | s->sh_flags &= ~SHF_ALLOC; |
| 125 | s->sh_addr = (unsigned long)dest; |
| 126 | } |
| 127 | if (strcmp(".l1.bss.B", secstrings + s->sh_name) == 0) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 128 | dest = l1_data_B_sram_alloc(s->sh_size); |
Meihui Fan | 96a87e2 | 2008-05-07 11:41:26 +0800 | [diff] [blame] | 129 | mod->arch.bss_b_l1 = dest; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 130 | if (dest == NULL) { |
| 131 | printk(KERN_ERR |
| 132 | "module %s: L1 data memory allocation failed\n", |
| 133 | mod->name); |
| 134 | return -1; |
| 135 | } |
| 136 | memset(dest, 0, s->sh_size); |
| 137 | s->sh_flags &= ~SHF_ALLOC; |
| 138 | s->sh_addr = (unsigned long)dest; |
| 139 | } |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 140 | if ((strcmp(".l2.text", secstrings + s->sh_name) == 0) || |
| 141 | ((strcmp(".text", secstrings + s->sh_name) == 0) && |
| 142 | (hdr->e_flags & EF_BFIN_CODE_IN_L2) && (s->sh_size > 0))) { |
| 143 | dest = l2_sram_alloc(s->sh_size); |
| 144 | mod->arch.text_l2 = dest; |
| 145 | if (dest == NULL) { |
| 146 | printk(KERN_ERR |
| 147 | "module %s: L2 SRAM allocation failed\n", |
| 148 | mod->name); |
| 149 | return -1; |
| 150 | } |
| 151 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 152 | s->sh_flags &= ~SHF_ALLOC; |
| 153 | s->sh_addr = (unsigned long)dest; |
| 154 | } |
| 155 | if ((strcmp(".l2.data", secstrings + s->sh_name) == 0) || |
| 156 | ((strcmp(".data", secstrings + s->sh_name) == 0) && |
| 157 | (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) { |
| 158 | dest = l2_sram_alloc(s->sh_size); |
| 159 | mod->arch.data_l2 = dest; |
| 160 | if (dest == NULL) { |
| 161 | printk(KERN_ERR |
| 162 | "module %s: L2 SRAM allocation failed\n", |
| 163 | mod->name); |
| 164 | return -1; |
| 165 | } |
| 166 | memcpy(dest, (void *)s->sh_addr, s->sh_size); |
| 167 | s->sh_flags &= ~SHF_ALLOC; |
| 168 | s->sh_addr = (unsigned long)dest; |
| 169 | } |
| 170 | if (strcmp(".l2.bss", secstrings + s->sh_name) == 0 || |
| 171 | ((strcmp(".bss", secstrings + s->sh_name) == 0) && |
| 172 | (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) { |
| 173 | dest = l2_sram_alloc(s->sh_size); |
| 174 | mod->arch.bss_l2 = dest; |
| 175 | if (dest == NULL) { |
| 176 | printk(KERN_ERR |
| 177 | "module %s: L2 SRAM allocation failed\n", |
| 178 | mod->name); |
| 179 | return -1; |
| 180 | } |
| 181 | memset(dest, 0, s->sh_size); |
| 182 | s->sh_flags &= ~SHF_ALLOC; |
| 183 | s->sh_addr = (unsigned long)dest; |
| 184 | } |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 185 | } |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | int |
| 190 | apply_relocate(Elf_Shdr * sechdrs, const char *strtab, |
| 191 | unsigned int symindex, unsigned int relsec, struct module *me) |
| 192 | { |
| 193 | printk(KERN_ERR "module %s: .rel unsupported\n", me->name); |
| 194 | return -ENOEXEC; |
| 195 | } |
| 196 | |
| 197 | /*************************************************************************/ |
| 198 | /* FUNCTION : apply_relocate_add */ |
| 199 | /* ABSTRACT : Blackfin specific relocation handling for the loadable */ |
| 200 | /* modules. Modules are expected to be .o files. */ |
| 201 | /* Arithmetic relocations are handled. */ |
| 202 | /* We do not expect LSETUP to be split and hence is not */ |
| 203 | /* handled. */ |
| 204 | /* R_byte and R_byte2 are also not handled as the gas */ |
| 205 | /* does not generate it. */ |
| 206 | /*************************************************************************/ |
| 207 | int |
| 208 | apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab, |
| 209 | unsigned int symindex, unsigned int relsec, |
| 210 | struct module *mod) |
| 211 | { |
| 212 | unsigned int i; |
| 213 | unsigned short tmp; |
| 214 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 215 | Elf32_Sym *sym; |
| 216 | uint32_t *location32; |
| 217 | uint16_t *location16; |
| 218 | uint32_t value; |
| 219 | |
| 220 | pr_debug("Applying relocate section %u to %u\n", relsec, |
| 221 | sechdrs[relsec].sh_info); |
| 222 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 223 | /* This is where to make the change */ |
| 224 | location16 = |
| 225 | (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr + |
| 226 | rel[i].r_offset); |
| 227 | location32 = (uint32_t *) location16; |
| 228 | /* This is the symbol it is referring to. Note that all |
| 229 | undefined symbols have been resolved. */ |
| 230 | sym = (Elf32_Sym *) sechdrs[symindex].sh_addr |
| 231 | + ELF32_R_SYM(rel[i].r_info); |
Bernd Schmidt | d1a8530 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 232 | value = sym->st_value; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 233 | value += rel[i].r_addend; |
| 234 | pr_debug("location is %x, value is %x type is %d \n", |
| 235 | (unsigned int) location32, value, |
| 236 | ELF32_R_TYPE(rel[i].r_info)); |
Graf Yang | 8f65873 | 2008-11-18 17:48:22 +0800 | [diff] [blame] | 237 | #ifdef CONFIG_SMP |
| 238 | if ((unsigned long)location16 >= COREB_L1_DATA_A_START) { |
| 239 | printk(KERN_ERR "module %s: cannot relocate in L1: %u (SMP kernel)", |
| 240 | mod->name, ELF32_R_TYPE(rel[i].r_info)); |
| 241 | return -ENOEXEC; |
| 242 | } |
| 243 | #endif |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 244 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 245 | |
| 246 | case R_pcrel24: |
| 247 | case R_pcrel24_jump_l: |
| 248 | /* Add the value, subtract its postition */ |
| 249 | location16 = |
| 250 | (uint16_t *) (sechdrs[sechdrs[relsec].sh_info]. |
| 251 | sh_addr + rel[i].r_offset - 2); |
| 252 | location32 = (uint32_t *) location16; |
| 253 | value -= (uint32_t) location32; |
| 254 | value >>= 1; |
Bernd Schmidt | d1a8530 | 2009-01-07 23:14:39 +0800 | [diff] [blame] | 255 | if ((value & 0xFF000000) != 0 && |
| 256 | (value & 0xFF000000) != 0xFF000000) { |
| 257 | printk(KERN_ERR "module %s: relocation overflow\n", |
| 258 | mod->name); |
| 259 | return -ENOEXEC; |
| 260 | } |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 261 | pr_debug("value is %x, before %x-%x after %x-%x\n", value, |
| 262 | *location16, *(location16 + 1), |
| 263 | (*location16 & 0xff00) | (value >> 16 & 0x00ff), |
| 264 | value & 0xffff); |
| 265 | *location16 = |
| 266 | (*location16 & 0xff00) | (value >> 16 & 0x00ff); |
| 267 | *(location16 + 1) = value & 0xffff; |
| 268 | break; |
| 269 | case R_pcrel12_jump: |
| 270 | case R_pcrel12_jump_s: |
| 271 | value -= (uint32_t) location32; |
| 272 | value >>= 1; |
| 273 | *location16 = (value & 0xfff); |
| 274 | break; |
| 275 | case R_pcrel10: |
| 276 | value -= (uint32_t) location32; |
| 277 | value >>= 1; |
| 278 | *location16 = (value & 0x3ff); |
| 279 | break; |
| 280 | case R_luimm16: |
| 281 | pr_debug("before %x after %x\n", *location16, |
| 282 | (value & 0xffff)); |
| 283 | tmp = (value & 0xffff); |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 284 | if ((unsigned long)location16 >= L1_CODE_START) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 285 | dma_memcpy(location16, &tmp, 2); |
| 286 | } else |
| 287 | *location16 = tmp; |
| 288 | break; |
| 289 | case R_huimm16: |
| 290 | pr_debug("before %x after %x\n", *location16, |
| 291 | ((value >> 16) & 0xffff)); |
| 292 | tmp = ((value >> 16) & 0xffff); |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 293 | if ((unsigned long)location16 >= L1_CODE_START) { |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 294 | dma_memcpy(location16, &tmp, 2); |
| 295 | } else |
| 296 | *location16 = tmp; |
| 297 | break; |
| 298 | case R_rimm16: |
| 299 | *location16 = (value & 0xffff); |
| 300 | break; |
| 301 | case R_byte4_data: |
| 302 | pr_debug("before %x after %x\n", *location32, value); |
| 303 | *location32 = value; |
| 304 | break; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 305 | default: |
| 306 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
| 307 | mod->name, ELF32_R_TYPE(rel[i].r_info)); |
| 308 | return -ENOEXEC; |
| 309 | } |
| 310 | } |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | int |
| 315 | module_finalize(const Elf_Ehdr * hdr, |
| 316 | const Elf_Shdr * sechdrs, struct module *mod) |
| 317 | { |
| 318 | unsigned int i, strindex = 0, symindex = 0; |
| 319 | char *secstrings; |
Graf Yang | 8f65873 | 2008-11-18 17:48:22 +0800 | [diff] [blame] | 320 | long err = 0; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 321 | |
| 322 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 323 | |
| 324 | for (i = 1; i < hdr->e_shnum; i++) { |
| 325 | /* Internal symbols and strings. */ |
| 326 | if (sechdrs[i].sh_type == SHT_SYMTAB) { |
| 327 | symindex = i; |
| 328 | strindex = sechdrs[i].sh_link; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | for (i = 1; i < hdr->e_shnum; i++) { |
| 333 | const char *strtab = (char *)sechdrs[strindex].sh_addr; |
| 334 | unsigned int info = sechdrs[i].sh_info; |
| 335 | |
| 336 | /* Not a valid relocation section? */ |
| 337 | if (info >= hdr->e_shnum) |
| 338 | continue; |
| 339 | |
| 340 | if ((sechdrs[i].sh_type == SHT_RELA) && |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 341 | ((strcmp(".rela.l2.text", secstrings + sechdrs[i].sh_name) == 0) || |
| 342 | (strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) || |
Mike Frysinger | 1f83b8f | 2007-07-12 22:58:21 +0800 | [diff] [blame] | 343 | ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) && |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 344 | (hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) { |
Graf Yang | 8f65873 | 2008-11-18 17:48:22 +0800 | [diff] [blame] | 345 | err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab, |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 346 | symindex, i, mod); |
Graf Yang | 8f65873 | 2008-11-18 17:48:22 +0800 | [diff] [blame] | 347 | if (err < 0) |
| 348 | return -ENOEXEC; |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 349 | } |
| 350 | } |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | void module_arch_cleanup(struct module *mod) |
| 355 | { |
Sonic Zhang | 262c382 | 2008-07-19 15:42:41 +0800 | [diff] [blame] | 356 | l1_inst_sram_free(mod->arch.text_l1); |
| 357 | l1_data_A_sram_free(mod->arch.data_a_l1); |
| 358 | l1_data_A_sram_free(mod->arch.bss_a_l1); |
| 359 | l1_data_B_sram_free(mod->arch.data_b_l1); |
| 360 | l1_data_B_sram_free(mod->arch.bss_b_l1); |
| 361 | l2_sram_free(mod->arch.text_l2); |
| 362 | l2_sram_free(mod->arch.data_l2); |
| 363 | l2_sram_free(mod->arch.bss_l2); |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 364 | } |