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, mod->name
   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                                 return -1;
  62                         }
  63                         dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
  64
  65                 } else if (!strcmp(".l1.data", shname) ||
  66                            (!strcmp(".data", shname) &&
  67                             (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
  68
  69                         dest = l1_data_sram_alloc(s->sh_size);
  70                         mod->arch.data_a_l1 = dest;
  71                         if (dest == NULL) {
  72                                 pr_err("L1 data memory allocation failed\n");
  73                                 return -1;
  74                         }
  75                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
  76
  77                 } else if (!strcmp(".l1.bss", shname) ||
  78                            (!strcmp(".bss", shname) &&
  79                             (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
  80
  81                         dest = l1_data_sram_zalloc(s->sh_size);
  82                         mod->arch.bss_a_l1 = dest;
  83                         if (dest == NULL) {
  84                                 pr_err("L1 data memory allocation failed\n");
  85                                 return -1;
  86                         }
  87
  88                 } else if (!strcmp(".l1.data.B", shname)) {
  89
  90                         dest = l1_data_B_sram_alloc(s->sh_size);
  91                         mod->arch.data_b_l1 = dest;
  92                         if (dest == NULL) {
  93                                 pr_err("L1 data memory allocation failed\n");
  94                                 return -1;
  95                         }
  96                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
  97
  98                 } else if (!strcmp(".l1.bss.B", shname)) {
  99
 100                         dest = l1_data_B_sram_alloc(s->sh_size);
 101                         mod->arch.bss_b_l1 = dest;
 102                         if (dest == NULL) {
 103                                 pr_err("L1 data memory allocation failed\n");
 104                                 return -1;
 105                         }
 106                         memset(dest, 0, s->sh_size);
 107
 108                 } else if (!strcmp(".l2.text", shname) ||
 109                            (!strcmp(".text", shname) &&
 110                             (hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
 111
 112                         dest = l2_sram_alloc(s->sh_size);
 113                         mod->arch.text_l2 = dest;
 114                         if (dest == NULL) {
 115                                 pr_err("L2 SRAM allocation failed\n");
 116                                 return -1;
 117                         }
 118                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 119
 120                 } else if (!strcmp(".l2.data", shname) ||
 121                            (!strcmp(".data", shname) &&
 122                             (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
 123
 124                         dest = l2_sram_alloc(s->sh_size);
 125                         mod->arch.data_l2 = dest;
 126                         if (dest == NULL) {
 127                                 pr_err("L2 SRAM allocation failed\n");
 128                                 return -1;
 129                         }
 130                         memcpy(dest, (void *)s->sh_addr, s->sh_size);
 131
 132                 } else if (!strcmp(".l2.bss", shname) ||
 133                            (!strcmp(".bss", shname) &&
 134                             (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
 135
 136                         dest = l2_sram_zalloc(s->sh_size);
 137                         mod->arch.bss_l2 = dest;
 138                         if (dest == NULL) {
 139                                 pr_err("L2 SRAM allocation failed\n");
 140                                 return -1;
 141                         }
 142
 143                 } else
 144                         continue;
 145
 146                 s->sh_flags &= ~SHF_ALLOC;
 147                 s->sh_addr = (unsigned long)dest;
 148         }
 149
 150         return 0;
 151 }
 152
 153 int
 154 apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
 155                unsigned int symindex, unsigned int relsec, struct module *mod)
 156 {
 157         pr_err(".rel unsupported\n");
 158         return -ENOEXEC;
 159 }
 160
 161 /*************************************************************************/
 162 /* FUNCTION : apply_relocate_add                                         */
 163 /* ABSTRACT : Blackfin specific relocation handling for the loadable     */
 164 /*            modules. Modules are expected to be .o files.              */
 165 /*            Arithmetic relocations are handled.                        */
 166 /*            We do not expect LSETUP to be split and hence is not       */
 167 /*            handled.                                                   */
 168 /*            R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the   */
 169 /*            gas does not generate it.                                  */
 170 /*************************************************************************/
 171 int
 172 apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 173                    unsigned int symindex, unsigned int relsec,
 174                    struct module *mod)
 175 {
 176         unsigned int i;
 177         Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 178         Elf32_Sym *sym;
 179         unsigned long location, value, size;
 180
 181         pr_debug("applying relocate section %u to %u\n",
 182                 relsec, sechdrs[relsec].sh_info);
 183
 184         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 185                 /* This is where to make the change */
 186                 location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
 187                            rel[i].r_offset;
 188
 189                 /* This is the symbol it is referring to. Note that all
 190                    undefined symbols have been resolved. */
 191                 sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
 192                     + ELF32_R_SYM(rel[i].r_info);
 193                 value = sym->st_value;
 194                 value += rel[i].r_addend;
 195
 196 #ifdef CONFIG_SMP
 197                 if (location >= COREB_L1_DATA_A_START) {
 198                         pr_err("cannot relocate in L1: %u (SMP kernel)\n",
 199                                 ELF32_R_TYPE(rel[i].r_info));
 200                         return -ENOEXEC;
 201                 }
 202 #endif
 203
 204                 pr_debug("location is %lx, value is %lx type is %d\n",
 205                         location, value, ELF32_R_TYPE(rel[i].r_info));
 206
 207                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 208
 209                 case R_BFIN_HUIMM16:
 210                         value >>= 16;
 211                 case R_BFIN_LUIMM16:
 212                 case R_BFIN_RIMM16:
 213                         size = 2;
 214                         break;
 215                 case R_BFIN_BYTE4_DATA:
 216                         size = 4;
 217                         break;
 218
 219                 case R_BFIN_PCREL24:
 220                 case R_BFIN_PCREL24_JUMP_L:
 221                 case R_BFIN_PCREL12_JUMP:
 222                 case R_BFIN_PCREL12_JUMP_S:
 223                 case R_BFIN_PCREL10:
 224                         pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
 225                                 ELF32_R_TYPE(rel[i].r_info));
 226                         return -ENOEXEC;
 227
 228                 default:
 229                         pr_err("unknown relocation: %u\n",
 230                                 ELF32_R_TYPE(rel[i].r_info));
 231                         return -ENOEXEC;
 232                 }
 233
 234                 switch (bfin_mem_access_type(location, size)) {
 235                 case BFIN_MEM_ACCESS_CORE:
 236                 case BFIN_MEM_ACCESS_CORE_ONLY:
 237                         memcpy((void *)location, &value, size);
 238                         break;
 239                 case BFIN_MEM_ACCESS_DMA:
 240                         dma_memcpy((void *)location, &value, size);
 241                         break;
 242                 case BFIN_MEM_ACCESS_ITEST:
 243                         isram_memcpy((void *)location, &value, size);
 244                         break;
 245                 default:
 246                         pr_err("invalid relocation for %#lx\n", location);
 247                         return -ENOEXEC;
 248                 }
 249         }
 250
 251         return 0;
 252 }
 253
 254 int
 255 module_finalize(const Elf_Ehdr * hdr,
 256                 const Elf_Shdr * sechdrs, struct module *mod)
 257 {
 258         unsigned int i, strindex = 0, symindex = 0;
 259         char *secstrings;
 260         long err = 0;
 261
 262         secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 263
 264         for (i = 1; i < hdr->e_shnum; i++) {
 265                 /* Internal symbols and strings. */
 266                 if (sechdrs[i].sh_type == SHT_SYMTAB) {
 267                         symindex = i;
 268                         strindex = sechdrs[i].sh_link;
 269                 }
 270         }
 271
 272         for (i = 1; i < hdr->e_shnum; i++) {
 273                 const char *strtab = (char *)sechdrs[strindex].sh_addr;
 274                 unsigned int info = sechdrs[i].sh_info;
 275                 const char *shname = secstrings + sechdrs[i].sh_name;
 276
 277                 /* Not a valid relocation section? */
 278                 if (info >= hdr->e_shnum)
 279                         continue;
 280
 281                 /* Only support RELA relocation types */
 282                 if (sechdrs[i].sh_type != SHT_RELA)
 283                         continue;
 284
 285                 if (!strcmp(".rela.l2.text", shname) ||
 286                     !strcmp(".rela.l1.text", shname) ||
 287                     (!strcmp(".rela.text", shname) &&
 288                          (hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
 289
 290                         err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
 291                                            symindex, i, mod);
 292                         if (err < 0)
 293                                 return -ENOEXEC;
 294                 }
 295         }
 296
 297         return 0;
 298 }
 299
 300 void module_arch_cleanup(struct module *mod)
 301 {
 302         l1_inst_sram_free(mod->arch.text_l1);
 303         l1_data_A_sram_free(mod->arch.data_a_l1);
 304         l1_data_A_sram_free(mod->arch.bss_a_l1);
 305         l1_data_B_sram_free(mod->arch.data_b_l1);
 306         l1_data_B_sram_free(mod->arch.bss_b_l1);
 307         l2_sram_free(mod->arch.text_l2);
 308         l2_sram_free(mod->arch.data_l2);
 309         l2_sram_free(mod->arch.bss_l2);
 310 }