target/linux/sibyte/patches/106-no_module_reloc.patch

   1 --- a/arch/mips/Makefile
   2 +++ b/arch/mips/Makefile
   3 @@ -93,8 +93,8 @@ all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlin
   4  cflags-y                       += -G 0 -mno-abicalls -fno-pic -pipe
   5  cflags-y                       += -msoft-float
   6  LDFLAGS_vmlinux                        += -G 0 -static -n -nostdlib
   7 -KBUILD_AFLAGS_MODULE           += -mno-long-calls
   8 -KBUILD_CFLAGS_MODULE           += -mno-long-calls
   9 +KBUILD_AFLAGS_MODULE           += -mlong-calls
  10 +KBUILD_CFLAGS_MODULE           += -mlong-calls
  11
  12  cflags-y += -ffreestanding
  13
  14 --- a/arch/mips/include/asm/module.h
  15 +++ b/arch/mips/include/asm/module.h
  16 @@ -9,11 +9,6 @@ struct mod_arch_specific {
  17         struct list_head dbe_list;
  18         const struct exception_table_entry *dbe_start;
  19         const struct exception_table_entry *dbe_end;
  20 -
  21 -       void *phys_plt_tbl;
  22 -       void *virt_plt_tbl;
  23 -       unsigned int phys_plt_offset;
  24 -       unsigned int virt_plt_offset;
  25  };
  26
  27  typedef uint8_t Elf64_Byte;            /* Type for a 8-bit quantity.  */
  28 --- a/arch/mips/kernel/module.c
  29 +++ b/arch/mips/kernel/module.c
  30 @@ -43,117 +43,6 @@ static struct mips_hi16 *mips_hi16_list;
  31  static LIST_HEAD(dbe_list);
  32  static DEFINE_SPINLOCK(dbe_lock);
  33
  34 -/*
  35 - * Get the potential max trampolines size required of the init and
  36 - * non-init sections. Only used if we cannot find enough contiguous
  37 - * physically mapped memory to put the module into.
  38 - */
  39 -static unsigned int
  40 -get_plt_size(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
  41 -             const char *secstrings, unsigned int symindex, bool is_init)
  42 -{
  43 -       unsigned long ret = 0;
  44 -       unsigned int i, j;
  45 -       Elf_Sym *syms;
  46 -
  47 -       /* Everything marked ALLOC (this includes the exported symbols) */
  48 -       for (i = 1; i < hdr->e_shnum; ++i) {
  49 -               unsigned int info = sechdrs[i].sh_info;
  50 -
  51 -               if (sechdrs[i].sh_type != SHT_REL
  52 -                   && sechdrs[i].sh_type != SHT_RELA)
  53 -                       continue;
  54 -
  55 -               /* Not a valid relocation section? */
  56 -               if (info >= hdr->e_shnum)
  57 -                       continue;
  58 -
  59 -               /* Don't bother with non-allocated sections */
  60 -               if (!(sechdrs[info].sh_flags & SHF_ALLOC))
  61 -                       continue;
  62 -
  63 -               /* If it's called *.init*, and we're not init, we're
  64 -                   not interested */
  65 -               if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)
  66 -                   != is_init)
  67 -                       continue;
  68 -
  69 -               syms = (Elf_Sym *) sechdrs[symindex].sh_addr;
  70 -               if (sechdrs[i].sh_type == SHT_REL) {
  71 -                       Elf_Mips_Rel *rel = (void *) sechdrs[i].sh_addr;
  72 -                       unsigned int size = sechdrs[i].sh_size / sizeof(*rel);
  73 -
  74 -                       for (j = 0; j < size; ++j) {
  75 -                               Elf_Sym *sym;
  76 -
  77 -                               if (ELF_MIPS_R_TYPE(rel[j]) != R_MIPS_26)
  78 -                                       continue;
  79 -
  80 -                               sym = syms + ELF_MIPS_R_SYM(rel[j]);
  81 -                               if (!is_init && sym->st_shndx != SHN_UNDEF)
  82 -                                       continue;
  83 -
  84 -                               ret += 4 * sizeof(int);
  85 -                       }
  86 -               } else {
  87 -                       Elf_Mips_Rela *rela = (void *) sechdrs[i].sh_addr;
  88 -                       unsigned int size = sechdrs[i].sh_size / sizeof(*rela);
  89 -
  90 -                       for (j = 0; j < size; ++j) {
  91 -                               Elf_Sym *sym;
  92 -
  93 -                               if (ELF_MIPS_R_TYPE(rela[j]) != R_MIPS_26)
  94 -                                       continue;
  95 -
  96 -                               sym = syms + ELF_MIPS_R_SYM(rela[j]);
  97 -                               if (!is_init && sym->st_shndx != SHN_UNDEF)
  98 -                                       continue;
  99 -
 100 -                               ret += 4 * sizeof(int);
 101 -                       }
 102 -               }
 103 -       }
 104 -
 105 -       return ret;
 106 -}
 107 -
 108 -#ifndef MODULE_START
 109 -static void *alloc_phys(unsigned long size)
 110 -{
 111 -       unsigned order;
 112 -       struct page *page;
 113 -       struct page *p;
 114 -
 115 -       size = PAGE_ALIGN(size);
 116 -       order = get_order(size);
 117 -
 118 -       page = alloc_pages(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN |
 119 -                       __GFP_THISNODE, order);
 120 -       if (!page)
 121 -               return NULL;
 122 -
 123 -       split_page(page, order);
 124 -
 125 -       for (p = page + (size >> PAGE_SHIFT); p < page + (1 << order); ++p)
 126 -               __free_page(p);
 127 -
 128 -       return page_address(page);
 129 -}
 130 -#endif
 131 -
 132 -static void free_phys(void *ptr, unsigned long size)
 133 -{
 134 -       struct page *page;
 135 -       struct page *end;
 136 -
 137 -       page = virt_to_page(ptr);
 138 -       end = page + (PAGE_ALIGN(size) >> PAGE_SHIFT);
 139 -
 140 -       for (; page < end; ++page)
 141 -               __free_page(page);
 142 -}
 143 -
 144 -
 145  void *module_alloc(unsigned long size)
 146  {
 147  #ifdef MODULE_START
 148 @@ -169,99 +58,21 @@ void *module_alloc(unsigned long size)
 149
 150         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
 151  #else
 152 -       void *ptr;
 153 -
 154         if (size == 0)
 155                 return NULL;
 156 -
 157 -       ptr = alloc_phys(size);
 158 -
 159 -       /* If we failed to allocate physically contiguous memory,
 160 -        * fall back to regular vmalloc. The module loader code will
 161 -        * create jump tables to handle long jumps */
 162 -       if (!ptr)
 163 -               return vmalloc(size);
 164 -
 165 -       return ptr;
 166 -#endif
 167 -}
 168 -
 169 -static inline bool is_phys_addr(void *ptr)
 170 -{
 171 -#ifdef CONFIG_64BIT
 172 -       return (KSEGX((unsigned long)ptr) == CKSEG0);
 173 -#else
 174 -       return (KSEGX(ptr) == KSEG0);
 175 +       return vmalloc(size);
 176  #endif
 177  }
 178
 179  /* Free memory returned from module_alloc */
 180  void module_free(struct module *mod, void *module_region)
 181  {
 182 -       if (is_phys_addr(module_region)) {
 183 -               if (mod->module_init == module_region)
 184 -                       free_phys(module_region, mod->init_size);
 185 -               else if (mod->module_core == module_region)
 186 -                       free_phys(module_region, mod->core_size);
 187 -               else
 188 -                       BUG();
 189 -       } else {
 190 -               vfree(module_region);
 191 -       }
 192 -}
 193 -
 194 -static void *__module_alloc(int size, bool phys)
 195 -{
 196 -       void *ptr;
 197 -
 198 -       if (phys)
 199 -               ptr = kmalloc(size, GFP_KERNEL);
 200 -       else
 201 -               ptr = vmalloc(size);
 202 -       return ptr;
 203 -}
 204 -
 205 -static void __module_free(void *ptr)
 206 -{
 207 -       if (is_phys_addr(ptr))
 208 -               kfree(ptr);
 209 -       else
 210 -               vfree(ptr);
 211 +       vfree(module_region);
 212  }
 213
 214  int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 215                               char *secstrings, struct module *mod)
 216  {
 217 -       unsigned int symindex = 0;
 218 -       unsigned int core_size, init_size;
 219 -       int i;
 220 -
 221 -       for (i = 1; i < hdr->e_shnum; i++)
 222 -               if (sechdrs[i].sh_type == SHT_SYMTAB)
 223 -                       symindex = i;
 224 -
 225 -       core_size = get_plt_size(hdr, sechdrs, secstrings, symindex, false);
 226 -       init_size = get_plt_size(hdr, sechdrs, secstrings, symindex, true);
 227 -
 228 -       mod->arch.phys_plt_offset = 0;
 229 -       mod->arch.virt_plt_offset = 0;
 230 -       mod->arch.phys_plt_tbl = NULL;
 231 -       mod->arch.virt_plt_tbl = NULL;
 232 -
 233 -       if ((core_size + init_size) == 0)
 234 -               return 0;
 235 -
 236 -       mod->arch.phys_plt_tbl = __module_alloc(core_size + init_size, 1);
 237 -       if (!mod->arch.phys_plt_tbl)
 238 -               return -ENOMEM;
 239 -
 240 -       mod->arch.virt_plt_tbl = __module_alloc(core_size + init_size, 0);
 241 -       if (!mod->arch.virt_plt_tbl) {
 242 -               __module_free(mod->arch.phys_plt_tbl);
 243 -               mod->arch.phys_plt_tbl = NULL;
 244 -               return -ENOMEM;
 245 -       }
 246 -
 247         return 0;
 248  }
 249
 250 @@ -284,36 +95,28 @@ static int apply_r_mips_32_rela(struct m
 251         return 0;
 252  }
 253
 254 -static Elf_Addr add_plt_entry_to(unsigned *plt_offset,
 255 -                                void *start, Elf_Addr v)
 256 +static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
 257  {
 258 -       unsigned *tramp = start + *plt_offset;
 259 -       *plt_offset += 4 * sizeof(int);
 260 -
 261 -       /* adjust carry for addiu */
 262 -       if (v & 0x00008000)
 263 -               v += 0x10000;
 264 -
 265 -       tramp[0] = 0x3c190000 | (v >> 16);      /* lui t9, hi16 */
 266 -       tramp[1] = 0x27390000 | (v & 0xffff);   /* addiu t9, t9, lo16 */
 267 -       tramp[2] = 0x03200008;                  /* jr t9 */
 268 -       tramp[3] = 0x00000000;                  /* nop */
 269 +       if (v % 4) {
 270 +               pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
 271 +                      me->name);
 272 +               return -ENOEXEC;
 273 +       }
 274
 275 -       return (Elf_Addr) tramp;
 276 -}
 277 +       if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
 278 +               printk(KERN_ERR
 279 +                      "module %s: relocation overflow\n",
 280 +                      me->name);
 281 +               return -ENOEXEC;
 282 +       }
 283
 284 -static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v)
 285 -{
 286 -       if (is_phys_addr(location))
 287 -               return add_plt_entry_to(&me->arch.phys_plt_offset,
 288 -                               me->arch.phys_plt_tbl, v);
 289 -       else
 290 -               return add_plt_entry_to(&me->arch.virt_plt_offset,
 291 -                               me->arch.virt_plt_tbl, v);
 292 +       *location = (*location & ~0x03ffffff) |
 293 +                   ((*location + (v >> 2)) & 0x03ffffff);
 294
 295 +       return 0;
 296  }
 297
 298 -static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v)
 299 +static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
 300  {
 301         if (v % 4) {
 302                 pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
 303 @@ -322,31 +125,17 @@ static int set_r_mips_26(struct module *
 304         }
 305
 306         if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
 307 -           v = add_plt_entry(me, location, v + (ofs << 2));
 308 -               if (!v) {
 309 -                       printk(KERN_ERR
 310 +               printk(KERN_ERR
 311                        "module %s: relocation overflow\n",
 312                        me->name);
 313 -                       return -ENOEXEC;
 314 -               }
 315 -               ofs = 0;
 316 +               return -ENOEXEC;
 317         }
 318
 319 -       *location = (*location & ~0x03ffffff) | ((ofs + (v >> 2)) & 0x03ffffff);
 320 +       *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
 321
 322         return 0;
 323  }
 324
 325 -static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
 326 -{
 327 -       return set_r_mips_26(me, location, *location & 0x03ffffff, v);
 328 -}
 329 -
 330 -static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
 331 -{
 332 -       return set_r_mips_26(me, location, 0, v);
 333 -}
 334 -
 335  static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
 336  {
 337         struct mips_hi16 *n;
 338 @@ -611,32 +400,11 @@ int module_finalize(const Elf_Ehdr *hdr,
 339                 list_add(&me->arch.dbe_list, &dbe_list);
 340                 spin_unlock_irq(&dbe_lock);
 341         }
 342 -
 343 -       /* Get rid of the fixup trampoline if we're running the module
 344 -        * from physically mapped address space */
 345 -       if (me->arch.phys_plt_offset == 0) {
 346 -               __module_free(me->arch.phys_plt_tbl);
 347 -               me->arch.phys_plt_tbl = NULL;
 348 -       }
 349 -       if (me->arch.virt_plt_offset == 0) {
 350 -               __module_free(me->arch.virt_plt_tbl);
 351 -               me->arch.virt_plt_tbl = NULL;
 352 -       }
 353 -
 354         return 0;
 355  }
 356
 357  void module_arch_cleanup(struct module *mod)
 358  {
 359 -       if (mod->arch.phys_plt_tbl) {
 360 -               __module_free(mod->arch.phys_plt_tbl);
 361 -               mod->arch.phys_plt_tbl = NULL;
 362 -       }
 363 -       if (mod->arch.virt_plt_tbl) {
 364 -               __module_free(mod->arch.virt_plt_tbl);
 365 -               mod->arch.virt_plt_tbl = NULL;
 366 -       }
 367 -
 368         spin_lock_irq(&dbe_lock);
 369         list_del(&mod->arch.dbe_list);
 370         spin_unlock_irq(&dbe_lock);