arch/blackfin/kernel/module.c

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later
   5  */
   6
   7 #define pr_fmt(fmt) "module %s: " fmt
   8
   9 #include <linux/moduleloader.h>
  10 #include <linux/elf.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/fs.h>
  13 #include <linux/string.h>
  14 #include <linux/kernel.h>
  15 #include <asm/dma.h>
  16 #include <asm/cacheflush.h>
  17 #include <asm/uaccess.h>
  18
  19 void *module_alloc(unsigned long size)
  20 {
  21         if (size == 0)
  22                 return NULL;
  23         return vmalloc(size);
  24 }
  25
  26 /* Free memory returned from module_alloc */
  27 void module_free(struct module *mod, void *module_region)
  28 {
  29         vfree(module_region);
  30 }
  31
  32 /* Transfer the section to the L1 memory */
  33 int
  34 module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
  35                           char *secstrings, struct module *mod)
  36 {
  37         /*
  38          * XXX: sechdrs are vmalloced in kernel/module.c
  39          * and would be vfreed just after module is loaded,
  40          * so we hack to keep the only information we needed
  41          * in mod->arch to correctly free L1 I/D sram later.
  42          * NOTE: this breaks the semantic of mod->arch structure.
  43          */
  44         Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
  45         void *dest;
  46
  47         for (s = sechdrs; s < sechdrs_end; ++s) {
  48                 const char *shname = secstrings + s->sh_name;
  49
  50                 if (s->sh_size == 0)
  51                         continue;
  52
  53                 if (!strcmp(".l1.text", shname) ||
  54                     (!strcmp(".text", shname) &&
  55                      (hdr->e_flags & EF_BFIN_CODE_IN_L1))) {
  56
  57                         dest = l1_inst_sram_alloc(s->sh_size);
  58                         mod->arch.text_l1 = dest;
  59                         if (dest == NULL) {
  60                                 pr_err("L1 inst memory allocation failed\n",
  61                                         mod->name);
  62                                 return -1;
  63                         }
  64                         dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
  65
  66                 } else if (!strcmp(".l1.data", shname) ||
  67                            (!strcmp(".data", shname) &&
  68                             (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
  69
  70                         dest = l1_data_sram_alloc(s->sh_size);
  71                         mod->arch.data_a_l1 = dest;
  72                         if (dest == NULL) {
  73                                 pr_err("L1 data memory allocation failed\n",
  74                                         mod->name);
  75                                 return -1;
  76                         }
  77                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
  78
  79                 } else if (!strcmp(".l1.bss", shname) ||
  80                            (!strcmp(".bss", shname) &&
  81                             (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
  82
  83                         dest = l1_data_sram_zalloc(s->sh_size);
  84                         mod->arch.bss_a_l1 = dest;
  85                         if (dest == NULL) {
  86                                 pr_err("L1 data memory allocation failed\n",
  87                                         mod->name);
  88                                 return -1;
  89                         }
  90
  91                 } else if (!strcmp(".l1.data.B", shname)) {
  92
  93                         dest = l1_data_B_sram_alloc(s->sh_size);
  94                         mod->arch.data_b_l1 = dest;
  95                         if (dest == NULL) {
  96                                 pr_err("L1 data memory allocation failed\n",
  97                                         mod->name);
  98                                 return -1;
  99                         }
 100                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 101
 102                 } else if (!strcmp(".l1.bss.B", shname)) {
 103
 104                         dest = l1_data_B_sram_alloc(s->sh_size);
 105                         mod->arch.bss_b_l1 = dest;
 106                         if (dest == NULL) {
 107                                 pr_err("L1 data memory allocation failed\n",
 108                                         mod->name);
 109                                 return -1;
 110                         }
 111                         memset(dest, 0, s->sh_size);
 112
 113                 } else if (!strcmp(".l2.text", shname) ||
 114                            (!strcmp(".text", shname) &&
 115                             (hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
 116
 117                         dest = l2_sram_alloc(s->sh_size);
 118                         mod->arch.text_l2 = dest;
 119                         if (dest == NULL) {
 120                                 pr_err("L2 SRAM allocation failed\n",
 121                                         mod->name);
 122                                 return -1;
 123                         }
 124                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 125
 126                 } else if (!strcmp(".l2.data", shname) ||
 127                            (!strcmp(".data", shname) &&
 128                             (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
 129
 130                         dest = l2_sram_alloc(s->sh_size);
 131                         mod->arch.data_l2 = dest;
 132                         if (dest == NULL) {
 133                                 pr_err("L2 SRAM allocation failed\n",
 134                                         mod->name);
 135                                 return -1;
 136                         }
 137                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 138
 139                 } else if (!strcmp(".l2.bss", shname) ||
 140                            (!strcmp(".bss", shname) &&
 141                             (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
 142
 143                         dest = l2_sram_zalloc(s->sh_size);
 144                         mod->arch.bss_l2 = dest;
 145                         if (dest == NULL) {
 146                                 pr_err("L2 SRAM allocation failed\n",
 147                                         mod->name);
 148                                 return -1;
 149                         }
 150
 151                 } else
 152                         continue;
 153
 154                 s->sh_flags &= ~SHF_ALLOC;
 155                 s->sh_addr = (unsigned long)dest;
 156         }
 157
 158         return 0;
 159 }
 160
 161 int
 162 apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
 163                unsigned int symindex, unsigned int relsec, struct module *me)
 164 {
 165         pr_err(".rel unsupported\n", me->name);
 166         return -ENOEXEC;
 167 }
 168
 169 /*************************************************************************/
 170 /* FUNCTION : apply_relocate_add                                         */
 171 /* ABSTRACT : Blackfin specific relocation handling for the loadable     */
 172 /*            modules. Modules are expected to be .o files.              */
 173 /*            Arithmetic relocations are handled.                        */
 174 /*            We do not expect LSETUP to be split and hence is not       */
 175 /*            handled.                                                   */
 176 /*            R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the   */
 177 /*            gas does not generate it.                                  */
 178 /*************************************************************************/
 179 int
 180 apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 181                    unsigned int symindex, unsigned int relsec,
 182                    struct module *mod)
 183 {
 184         unsigned int i;
 185         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 186         Elf32_Sym *sym;
 187         unsigned long location, value, size;
 188
 189         pr_debug("applying relocate section %u to %u\n", mod->name,
 190                 relsec, sechdrs[relsec].sh_info);
 191
 192         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 193                 /* This is where to make the change */
 194                 location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
 195                            rel[i].r_offset;
 196
 197                 /* This is the symbol it is referring to. Note that all
 198                    undefined symbols have been resolved. */
 199                 sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
 200                     + ELF32_R_SYM(rel[i].r_info);
 201                 value = sym->st_value;
 202                 value += rel[i].r_addend;
 203
 204 #ifdef CONFIG_SMP
 205                 if (location >= COREB_L1_DATA_A_START) {
 206                         pr_err("cannot relocate in L1: %u (SMP kernel)",
 207                                 mod->name, ELF32_R_TYPE(rel[i].r_info));
 208                         return -ENOEXEC;
 209                 }
 210 #endif
 211
 212                 pr_debug("location is %lx, value is %lx type is %d\n",
 213                         mod->name, location, value, ELF32_R_TYPE(rel[i].r_info));
 214
 215                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 216
 217                 case R_BFIN_HUIMM16:
 218                         value >>= 16;
 219                 case R_BFIN_LUIMM16:
 220                 case R_BFIN_RIMM16:
 221                         size = 2;
 222                         break;
 223                 case R_BFIN_BYTE4_DATA:
 224                         size = 4;
 225                         break;
 226
 227                 case R_BFIN_PCREL24:
 228                 case R_BFIN_PCREL24_JUMP_L:
 229                 case R_BFIN_PCREL12_JUMP:
 230                 case R_BFIN_PCREL12_JUMP_S:
 231                 case R_BFIN_PCREL10:
 232                         pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
 233                                 mod->name, ELF32_R_TYPE(rel[i].r_info));
 234                         return -ENOEXEC;
 235
 236                 default:
 237                         pr_err("unknown relocation: %u\n", mod->name,
 238                                 ELF32_R_TYPE(rel[i].r_info));
 239                         return -ENOEXEC;
 240                 }
 241
 242                 switch (bfin_mem_access_type(location, size)) {
 243                 case BFIN_MEM_ACCESS_CORE:
 244                 case BFIN_MEM_ACCESS_CORE_ONLY:
 245                         memcpy((void *)location, &value, size);
 246                         break;
 247                 case BFIN_MEM_ACCESS_DMA:
 248                         dma_memcpy((void *)location, &value, size);
 249                         break;
 250                 case BFIN_MEM_ACCESS_ITEST:
 251                         isram_memcpy((void *)location, &value, size);
 252                         break;
 253                 default:
 254                         pr_err("invalid relocation for %#lx\n",
 255                                 mod->name, location);
 256                         return -ENOEXEC;
 257                 }
 258         }
 259
 260         return 0;
 261 }
 262
 263 int
 264 module_finalize(const Elf_Ehdr * hdr,
 265                 const Elf_Shdr * sechdrs, struct module *mod)
 266 {
 267         unsigned int i, strindex = 0, symindex = 0;
 268         char *secstrings;
 269         long err = 0;
 270
 271         secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 272
 273         for (i = 1; i < hdr->e_shnum; i++) {
 274                 /* Internal symbols and strings. */
 275                 if (sechdrs[i].sh_type == SHT_SYMTAB) {
 276                         symindex = i;
 277                         strindex = sechdrs[i].sh_link;
 278                 }
 279         }
 280
 281         for (i = 1; i < hdr->e_shnum; i++) {
 282                 const char *strtab = (char *)sechdrs[strindex].sh_addr;
 283                 unsigned int info = sechdrs[i].sh_info;
 284                 const char *shname = secstrings + sechdrs[i].sh_name;
 285
 286                 /* Not a valid relocation section? */
 287                 if (info >= hdr->e_shnum)
 288                         continue;
 289
 290                 /* Only support RELA relocation types */
 291                 if (sechdrs[i].sh_type != SHT_RELA)
 292                         continue;
 293
 294                 if (!strcmp(".rela.l2.text", shname) ||
 295                     !strcmp(".rela.l1.text", shname) ||
 296                     (!strcmp(".rela.text", shname) &&
 297                          (hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
 298
 299                         err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
 300                                            symindex, i, mod);
 301                         if (err < 0)
 302                                 return -ENOEXEC;
 303                 }
 304         }
 305
 306         return 0;
 307 }
 308
 309 void module_arch_cleanup(struct module *mod)
 310 {
 311         l1_inst_sram_free(mod->arch.text_l1);
 312         l1_data_A_sram_free(mod->arch.data_a_l1);
 313         l1_data_A_sram_free(mod->arch.bss_a_l1);
 314         l1_data_B_sram_free(mod->arch.data_b_l1);
 315         l1_data_B_sram_free(mod->arch.bss_b_l1);
 316         l2_sram_free(mod->arch.text_l2);
 317         l2_sram_free(mod->arch.data_l2);
 318         l2_sram_free(mod->arch.bss_l2);
 319 }