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 #define pr_fmt(fmt) "module %s: " fmt
  31
  32 #include <linux/moduleloader.h>
  33 #include <linux/elf.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/fs.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <asm/dma.h>
  39 #include <asm/cacheflush.h>
  40
  41 void *module_alloc(unsigned long size)
  42 {
  43         if (size == 0)
  44                 return NULL;
  45         return vmalloc(size);
  46 }
  47
  48 /* Free memory returned from module_alloc */
  49 void module_free(struct module *mod, void *module_region)
  50 {
  51         vfree(module_region);
  52 }
  53
  54 /* Transfer the section to the L1 memory */
  55 int
  56 module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
  57                           char *secstrings, struct module *mod)
  58 {
  59         /*
  60          * XXX: sechdrs are vmalloced in kernel/module.c
  61          * and would be vfreed just after module is loaded,
  62          * so we hack to keep the only information we needed
  63          * in mod->arch to correctly free L1 I/D sram later.
  64          * NOTE: this breaks the semantic of mod->arch structure.
  65          */
  66         Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
  67         void *dest = NULL;
  68
  69         for (s = sechdrs; s < sechdrs_end; ++s) {
  70                 if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) ||
  71                     ((strcmp(".text", secstrings + s->sh_name) == 0) &&
  72                      (hdr->e_flags & EF_BFIN_CODE_IN_L1) && (s->sh_size > 0))) {
  73                         dest = l1_inst_sram_alloc(s->sh_size);
  74                         mod->arch.text_l1 = dest;
  75                         if (dest == NULL) {
  76                                 pr_err("L1 inst 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                                 pr_err("L1 data memory allocation failed\n",
  91                                         mod->name);
  92                                 return -1;
  93                         }
  94                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
  95                         s->sh_flags &= ~SHF_ALLOC;
  96                         s->sh_addr = (unsigned long)dest;
  97                 }
  98                 if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 ||
  99                     ((strcmp(".bss", secstrings + s->sh_name) == 0) &&
 100                      (hdr->e_flags & EF_BFIN_DATA_IN_L1) && (s->sh_size > 0))) {
 101                         dest = l1_data_sram_zalloc(s->sh_size);
 102                         mod->arch.bss_a_l1 = dest;
 103                         if (dest == NULL) {
 104                                 pr_err("L1 data memory allocation failed\n",
 105                                         mod->name);
 106                                 return -1;
 107                         }
 108                         s->sh_flags &= ~SHF_ALLOC;
 109                         s->sh_addr = (unsigned long)dest;
 110                 }
 111                 if (strcmp(".l1.data.B", secstrings + s->sh_name) == 0) {
 112                         dest = l1_data_B_sram_alloc(s->sh_size);
 113                         mod->arch.data_b_l1 = dest;
 114                         if (dest == NULL) {
 115                                 pr_err("L1 data memory allocation failed\n",
 116                                         mod->name);
 117                                 return -1;
 118                         }
 119                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 120                         s->sh_flags &= ~SHF_ALLOC;
 121                         s->sh_addr = (unsigned long)dest;
 122                 }
 123                 if (strcmp(".l1.bss.B", secstrings + s->sh_name) == 0) {
 124                         dest = l1_data_B_sram_alloc(s->sh_size);
 125                         mod->arch.bss_b_l1 = dest;
 126                         if (dest == NULL) {
 127                                 pr_err("L1 data memory allocation failed\n",
 128                                         mod->name);
 129                                 return -1;
 130                         }
 131                         memset(dest, 0, s->sh_size);
 132                         s->sh_flags &= ~SHF_ALLOC;
 133                         s->sh_addr = (unsigned long)dest;
 134                 }
 135                 if ((strcmp(".l2.text", secstrings + s->sh_name) == 0) ||
 136                     ((strcmp(".text", secstrings + s->sh_name) == 0) &&
 137                      (hdr->e_flags & EF_BFIN_CODE_IN_L2) && (s->sh_size > 0))) {
 138                         dest = l2_sram_alloc(s->sh_size);
 139                         mod->arch.text_l2 = dest;
 140                         if (dest == NULL) {
 141                                 pr_err("L2 SRAM allocation failed\n",
 142                                         mod->name);
 143                                 return -1;
 144                         }
 145                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 146                         s->sh_flags &= ~SHF_ALLOC;
 147                         s->sh_addr = (unsigned long)dest;
 148                 }
 149                 if ((strcmp(".l2.data", secstrings + s->sh_name) == 0) ||
 150                     ((strcmp(".data", secstrings + s->sh_name) == 0) &&
 151                      (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
 152                         dest = l2_sram_alloc(s->sh_size);
 153                         mod->arch.data_l2 = dest;
 154                         if (dest == NULL) {
 155                                 pr_err("L2 SRAM allocation failed\n",
 156                                         mod->name);
 157                                 return -1;
 158                         }
 159                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 160                         s->sh_flags &= ~SHF_ALLOC;
 161                         s->sh_addr = (unsigned long)dest;
 162                 }
 163                 if (strcmp(".l2.bss", secstrings + s->sh_name) == 0 ||
 164                     ((strcmp(".bss", secstrings + s->sh_name) == 0) &&
 165                      (hdr->e_flags & EF_BFIN_DATA_IN_L2) && (s->sh_size > 0))) {
 166                         dest = l2_sram_zalloc(s->sh_size);
 167                         mod->arch.bss_l2 = dest;
 168                         if (dest == NULL) {
 169                                 pr_err("L2 SRAM allocation failed\n",
 170                                         mod->name);
 171                                 return -1;
 172                         }
 173                         s->sh_flags &= ~SHF_ALLOC;
 174                         s->sh_addr = (unsigned long)dest;
 175                 }
 176         }
 177         return 0;
 178 }
 179
 180 int
 181 apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
 182                unsigned int symindex, unsigned int relsec, struct module *me)
 183 {
 184         pr_err(".rel unsupported\n", me->name);
 185         return -ENOEXEC;
 186 }
 187
 188 /*************************************************************************/
 189 /* FUNCTION : apply_relocate_add                                         */
 190 /* ABSTRACT : Blackfin specific relocation handling for the loadable     */
 191 /*            modules. Modules are expected to be .o files.              */
 192 /*            Arithmetic relocations are handled.                        */
 193 /*            We do not expect LSETUP to be split and hence is not       */
 194 /*            handled.                                                   */
 195 /*            R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the   */
 196 /*            gas does not generate it.                                  */
 197 /*************************************************************************/
 198 int
 199 apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
 200                    unsigned int symindex, unsigned int relsec,
 201                    struct module *mod)
 202 {
 203         unsigned int i;
 204         unsigned short tmp;
 205         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 206         Elf32_Sym *sym;
 207         uint32_t *location32;
 208         uint16_t *location16;
 209         uint32_t value;
 210
 211         pr_debug("applying relocate section %u to %u\n", mod->name,
 212                 relsec, sechdrs[relsec].sh_info);
 213         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 214                 /* This is where to make the change */
 215                 location16 =
 216                     (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr +
 217                                   rel[i].r_offset);
 218                 location32 = (uint32_t *) location16;
 219                 /* This is the symbol it is referring to. Note that all
 220                    undefined symbols have been resolved. */
 221                 sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
 222                     + ELF32_R_SYM(rel[i].r_info);
 223                 value = sym->st_value;
 224                 value += rel[i].r_addend;
 225
 226 #ifdef CONFIG_SMP
 227                 if ((unsigned long)location16 >= COREB_L1_DATA_A_START) {
 228                         pr_err("cannot relocate in L1: %u (SMP kernel)",
 229                                 mod->name, ELF32_R_TYPE(rel[i].r_info));
 230                         return -ENOEXEC;
 231                 }
 232 #endif
 233
 234                 pr_debug("location is %lx, value is %x type is %d\n",
 235                         mod->name, (unsigned long)location32, value,
 236                         ELF32_R_TYPE(rel[i].r_info));
 237
 238                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 239
 240                 case R_BFIN_LUIMM16:
 241                         tmp = (value & 0xffff);
 242                         if ((unsigned long)location16 >= L1_CODE_START) {
 243                                 dma_memcpy(location16, &tmp, 2);
 244                         } else
 245                                 *location16 = tmp;
 246                         break;
 247                 case R_BFIN_HUIMM16:
 248                         tmp = ((value >> 16) & 0xffff);
 249                         if ((unsigned long)location16 >= L1_CODE_START) {
 250                                 dma_memcpy(location16, &tmp, 2);
 251                         } else
 252                                 *location16 = tmp;
 253                         break;
 254                 case R_BFIN_RIMM16:
 255                         *location16 = (value & 0xffff);
 256                         break;
 257                 case R_BFIN_BYTE4_DATA:
 258                         *location32 = value;
 259                         break;
 260                 case R_BFIN_PCREL24:
 261                 case R_BFIN_PCREL24_JUMP_L:
 262                 case R_BFIN_PCREL12_JUMP:
 263                 case R_BFIN_PCREL12_JUMP_S:
 264                 case R_BFIN_PCREL10:
 265                         pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
 266                                 mod->name, ELF32_R_TYPE(rel[i].r_info));
 267                         return -ENOEXEC;
 268                 default:
 269                         pr_err("unknown relocation: %u\n", mod->name,
 270                                 ELF32_R_TYPE(rel[i].r_info));
 271                         return -ENOEXEC;
 272                 }
 273         }
 274         return 0;
 275 }
 276
 277 int
 278 module_finalize(const Elf_Ehdr * hdr,
 279                 const Elf_Shdr * sechdrs, struct module *mod)
 280 {
 281         unsigned int i, strindex = 0, symindex = 0;
 282         char *secstrings;
 283         long err = 0;
 284
 285         secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 286
 287         for (i = 1; i < hdr->e_shnum; i++) {
 288                 /* Internal symbols and strings. */
 289                 if (sechdrs[i].sh_type == SHT_SYMTAB) {
 290                         symindex = i;
 291                         strindex = sechdrs[i].sh_link;
 292                 }
 293         }
 294
 295         for (i = 1; i < hdr->e_shnum; i++) {
 296                 const char *strtab = (char *)sechdrs[strindex].sh_addr;
 297                 unsigned int info = sechdrs[i].sh_info;
 298
 299                 /* Not a valid relocation section? */
 300                 if (info >= hdr->e_shnum)
 301                         continue;
 302
 303                 if ((sechdrs[i].sh_type == SHT_RELA) &&
 304                     ((strcmp(".rela.l2.text", secstrings + sechdrs[i].sh_name) == 0) ||
 305                     (strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
 306                     ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
 307                         (hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) {
 308                         err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
 309                                            symindex, i, mod);
 310                         if (err < 0)
 311                                 return -ENOEXEC;
 312                 }
 313         }
 314         return 0;
 315 }
 316
 317 void module_arch_cleanup(struct module *mod)
 318 {
 319         l1_inst_sram_free(mod->arch.text_l1);
 320         l1_data_A_sram_free(mod->arch.data_a_l1);
 321         l1_data_A_sram_free(mod->arch.bss_a_l1);
 322         l1_data_B_sram_free(mod->arch.data_b_l1);
 323         l1_data_B_sram_free(mod->arch.bss_b_l1);
 324         l2_sram_free(mod->arch.text_l2);
 325         l2_sram_free(mod->arch.data_l2);
 326         l2_sram_free(mod->arch.bss_l2);
 327 }