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