arch/blackfin/kernel/module.c

   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 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 {
  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          */
  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) ||
  70                     ((strcmp(".text", secstrings + s->sh_name) == 0) &&
  71                      (hdr->e_flags & EF_BFIN_CODE_IN_L1) && (s->sh_size > 0))) {
  72                         dest = l1_inst_sram_alloc(s->sh_size);
  73                         mod->arch.text_l1 = dest;
  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                 }
  84                 if ((strcmp(".l1.data", secstrings + s->sh_name) == 0) ||
  85                     ((strcmp(".data", secstrings + s->sh_name) == 0) &&
  86                      (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
  87                         dest = l1_data_sram_alloc(s->sh_size);
  88                         mod->arch.data_a_l1 = dest;
  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 ||
 100                     ((strcmp(".bss", secstrings + s->sh_name) == 0) &&
 101                      (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
 102                         dest = l1_data_sram_alloc(s->sh_size);
 103                         mod->arch.bss_a_l1 = dest;
 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) {
 115                         dest = l1_data_B_sram_alloc(s->sh_size);
 116                         mod->arch.data_b_l1 = dest;
 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) {
 128                         dest = l1_data_B_sram_alloc(s->sh_size);
 129                         mod->arch.bss_b_l1 = dest;
 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                 }
 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                 }
 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_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the   */
 205 /*            gas 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);
 232                 value = sym->st_value;
 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));
 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
 244                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 245
 246                 case R_BFIN_PCREL24:
 247                 case R_BFIN_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;
 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                         }
 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_BFIN_PCREL12_JUMP:
 270                 case R_BFIN_PCREL12_JUMP_S:
 271                         value -= (uint32_t) location32;
 272                         value >>= 1;
 273                         *location16 = (value & 0xfff);
 274                         break;
 275                 case R_BFIN_PCREL10:
 276                         value -= (uint32_t) location32;
 277                         value >>= 1;
 278                         *location16 = (value & 0x3ff);
 279                         break;
 280                 case R_BFIN_LUIMM16:
 281                         pr_debug("before %x after %x\n", *location16,
 282                                        (value & 0xffff));
 283                         tmp = (value & 0xffff);
 284                         if ((unsigned long)location16 >= L1_CODE_START) {
 285                                 dma_memcpy(location16, &tmp, 2);
 286                         } else
 287                                 *location16 = tmp;
 288                         break;
 289                 case R_BFIN_HUIMM16:
 290                         pr_debug("before %x after %x\n", *location16,
 291                                        ((value >> 16) & 0xffff));
 292                         tmp = ((value >> 16) & 0xffff);
 293                         if ((unsigned long)location16 >= L1_CODE_START) {
 294                                 dma_memcpy(location16, &tmp, 2);
 295                         } else
 296                                 *location16 = tmp;
 297                         break;
 298                 case R_BFIN_RIMM16:
 299                         *location16 = (value & 0xffff);
 300                         break;
 301                 case R_BFIN_BYTE4_DATA:
 302                         pr_debug("before %x after %x\n", *location32, value);
 303                         *location32 = value;
 304                         break;
 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;
 320         long err = 0;
 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) &&
 341                     ((strcmp(".rela.l2.text", secstrings + sechdrs[i].sh_name) == 0) ||
 342                     (strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
 343                     ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
 344                         (hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) {
 345                         err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
 346                                            symindex, i, mod);
 347                         if (err < 0)
 348                                 return -ENOEXEC;
 349                 }
 350         }
 351         return 0;
 352 }
 353
 354 void module_arch_cleanup(struct module *mod)
 355 {
 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);
 364 }