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

   1 diff -urN linux-2.6.30.7/arch/mips/Makefile linux-2.6.30.7.new/arch/mips/Makefile
   2 --- linux-2.6.30.7/arch/mips/Makefile   2009-09-27 13:17:16.000000000 +0200
   3 +++ linux-2.6.30.7.new/arch/mips/Makefile       2009-09-15 19:46:05.000000000 +0200
   4 @@ -83,7 +83,7 @@
   5  cflags-y                       += -G 0 -mno-abicalls -fno-pic -pipe
   6  cflags-y                       += -msoft-float
   7  LDFLAGS_vmlinux                        += -G 0 -static -n -nostdlib
   8 -MODFLAGS                       += -mno-long-calls
   9 +MODFLAGS                       += -mlong-calls
  10
  11  cflags-y += -ffreestanding
  12
  13 diff -urN linux-2.6.30.7/arch/mips/include/asm/module.h linux-2.6.30.7.new/arch/mips/include/asm/module.h
  14 --- linux-2.6.30.7/arch/mips/include/asm/module.h       2009-09-27 13:17:16.000000000 +0200
  15 +++ linux-2.6.30.7.new/arch/mips/include/asm/module.h   2009-09-15 19:46:05.000000000 +0200
  16 @@ -9,11 +9,6 @@
  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 *plt_tbl;
  22 -       unsigned int core_plt_offset;
  23 -       unsigned int core_plt_size;
  24 -       unsigned int init_plt_offset;
  25  };
  26
  27  typedef uint8_t Elf64_Byte;            /* Type for a 8-bit quantity.  */
  28 diff -urN linux-2.6.30.7/arch/mips/kernel/module.c linux-2.6.30.7.new/arch/mips/kernel/module.c
  29 --- linux-2.6.30.7/arch/mips/kernel/module.c    2009-09-27 13:17:16.000000000 +0200
  30 +++ linux-2.6.30.7.new/arch/mips/kernel/module.c        2009-09-15 19:46:05.000000000 +0200
  31 @@ -43,116 +43,6 @@
  32  static LIST_HEAD(dbe_list);
  33  static DEFINE_SPINLOCK(dbe_lock);
  34
  35 -/*
  36 - * Get the potential max trampolines size required of the init and
  37 - * non-init sections. Only used if we cannot find enough contiguous
  38 - * physically mapped memory to put the module into.
  39 - */
  40 -static unsigned int
  41 -get_plt_size(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
  42 -             const char *secstrings, unsigned int symindex, bool is_init)
  43 -{
  44 -       unsigned long ret = 0;
  45 -       unsigned int i, j;
  46 -       Elf_Sym *syms;
  47 -
  48 -       /* Everything marked ALLOC (this includes the exported symbols) */
  49 -       for (i = 1; i < hdr->e_shnum; ++i) {
  50 -               unsigned int info = sechdrs[i].sh_info;
  51 -
  52 -               if (sechdrs[i].sh_type != SHT_REL
  53 -                   && sechdrs[i].sh_type != SHT_RELA)
  54 -                       continue;
  55 -
  56 -               /* Not a valid relocation section? */
  57 -               if (info >= hdr->e_shnum)
  58 -                       continue;
  59 -
  60 -               /* Don't bother with non-allocated sections */
  61 -               if (!(sechdrs[info].sh_flags & SHF_ALLOC))
  62 -                       continue;
  63 -
  64 -               /* If it's called *.init*, and we're not init, we're
  65 -                   not interested */
  66 -               if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)
  67 -                   != is_init)
  68 -                       continue;
  69 -
  70 -               syms = (Elf_Sym *) sechdrs[symindex].sh_addr;
  71 -               if (sechdrs[i].sh_type == SHT_REL) {
  72 -                       Elf_Mips_Rel *rel = (void *) sechdrs[i].sh_addr;
  73 -                       unsigned int size = sechdrs[i].sh_size / sizeof(*rel);
  74 -
  75 -                       for (j = 0; j < size; ++j) {
  76 -                               Elf_Sym *sym;
  77 -
  78 -                               if (ELF_MIPS_R_TYPE(rel[j]) != R_MIPS_26)
  79 -                                       continue;
  80 -
  81 -                               sym = syms + ELF_MIPS_R_SYM(rel[j]);
  82 -                               if (!is_init && sym->st_shndx != SHN_UNDEF)
  83 -                                       continue;
  84 -
  85 -                               ret += 4 * sizeof(int);
  86 -                       }
  87 -               } else {
  88 -                       Elf_Mips_Rela *rela = (void *) sechdrs[i].sh_addr;
  89 -                       unsigned int size = sechdrs[i].sh_size / sizeof(*rela);
  90 -
  91 -                       for (j = 0; j < size; ++j) {
  92 -                               Elf_Sym *sym;
  93 -
  94 -                               if (ELF_MIPS_R_TYPE(rela[j]) != R_MIPS_26)
  95 -                                       continue;
  96 -
  97 -                               sym = syms + ELF_MIPS_R_SYM(rela[j]);
  98 -                               if (!is_init && sym->st_shndx != SHN_UNDEF)
  99 -                                       continue;
 100 -
 101 -                               ret += 4 * sizeof(int);
 102 -                       }
 103 -               }
 104 -       }
 105 -
 106 -       return ret;
 107 -}
 108 -
 109 -#ifndef MODULE_START
 110 -static void *alloc_phys(unsigned long size)
 111 -{
 112 -       unsigned order;
 113 -       struct page *page;
 114 -       struct page *p;
 115 -
 116 -       size = PAGE_ALIGN(size);
 117 -       order = get_order(size);
 118 -
 119 -       page = alloc_pages(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN |
 120 -                       __GFP_THISNODE, order);
 121 -       if (!page)
 122 -               return NULL;
 123 -
 124 -       split_page(page, order);
 125 -
 126 -       for (p = page + (size >> PAGE_SHIFT); p < page + (1 << order); ++p)
 127 -               __free_page(p);
 128 -
 129 -       return page_address(page);
 130 -}
 131 -#endif
 132 -
 133 -static void free_phys(void *ptr, unsigned long size)
 134 -{
 135 -       struct page *page;
 136 -       struct page *end;
 137 -
 138 -       page = virt_to_page(ptr);
 139 -       end = page + (PAGE_ALIGN(size) >> PAGE_SHIFT);
 140 -
 141 -       for (; page < end; ++page)
 142 -               __free_page(page);
 143 -}
 144 -
 145  void *module_alloc(unsigned long size)
 146  {
 147  #ifdef MODULE_START
 148 @@ -168,45 +58,16 @@
 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 +       vfree(module_region);
 193         /* FIXME: If module_region == mod->init_region, trim exception
 194             table entries. */
 195  }
 196 @@ -214,24 +75,6 @@
 197  int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 198                               char *secstrings, struct module *mod)
 199  {
 200 -       unsigned int symindex = 0;
 201 -       unsigned int core_size, init_size;
 202 -       int i;
 203 -
 204 -       for (i = 1; i < hdr->e_shnum; i++)
 205 -               if (sechdrs[i].sh_type == SHT_SYMTAB)
 206 -                       symindex = i;
 207 -
 208 -       core_size = get_plt_size(hdr, sechdrs, secstrings, symindex, false);
 209 -       init_size = get_plt_size(hdr, sechdrs, secstrings, symindex, true);
 210 -
 211 -       mod->arch.core_plt_offset = 0;
 212 -       mod->arch.core_plt_size = core_size;
 213 -       mod->arch.init_plt_offset = core_size;
 214 -       mod->arch.plt_tbl = kmalloc(core_size + init_size, GFP_KERNEL);
 215 -       if (!mod->arch.plt_tbl)
 216 -               return -ENOMEM;
 217 -
 218         return 0;
 219  }
 220
 221 @@ -254,41 +97,27 @@
 222         return 0;
 223  }
 224
 225 -static Elf_Addr add_plt_entry_to(unsigned *plt_offset,
 226 -                                void *start, Elf_Addr v)
 227 +static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
 228  {
 229 -       unsigned *tramp = start + *plt_offset;
 230 -
 231 -       *plt_offset += 4 * sizeof(int);
 232 -
 233 -       /* adjust carry for addiu */
 234 -       if (v & 0x00008000)
 235 -               v += 0x10000;
 236 -
 237 -       tramp[0] = 0x3c190000 | (v >> 16);      /* lui t9, hi16 */
 238 -       tramp[1] = 0x27390000 | (v & 0xffff);   /* addiu t9, t9, lo16 */
 239 -       tramp[2] = 0x03200008;                  /* jr t9 */
 240 -       tramp[3] = 0x00000000;                  /* nop */
 241 -
 242 -       return (Elf_Addr) tramp;
 243 -}
 244 +       if (v % 4) {
 245 +               printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
 246 +               return -ENOEXEC;
 247 +       }
 248
 249 -static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v)
 250 -{
 251 -       if (location >= me->module_core &&
 252 -           location < me->module_core + me->core_size)
 253 -               return add_plt_entry_to(&me->arch.core_plt_offset,
 254 -                               me->arch.plt_tbl, v);
 255 +       if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
 256 +               printk(KERN_ERR
 257 +                      "module %s: relocation overflow\n",
 258 +                      me->name);
 259 +               return -ENOEXEC;
 260 +       }
 261
 262 -       if (location >= me->module_init &&
 263 -           location < me->module_init + me->init_size)
 264 -               return add_plt_entry_to(&me->arch.init_plt_offset,
 265 -                               me->arch.plt_tbl, v);
 266 +       *location = (*location & ~0x03ffffff) |
 267 +                   ((*location + (v >> 2)) & 0x03ffffff);
 268
 269         return 0;
 270  }
 271
 272 -static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v)
 273 +static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
 274  {
 275         if (v % 4) {
 276                 printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
 277 @@ -296,31 +125,17 @@
 278         }
 279
 280         if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
 281 -           v = add_plt_entry(me, location, v + (ofs << 2));
 282 -               if (!v) {
 283 -                       printk(KERN_ERR
 284 +               printk(KERN_ERR
 285                        "module %s: relocation overflow\n",
 286                        me->name);
 287 -                       return -ENOEXEC;
 288 -               }
 289 -               ofs = 0;
 290 +               return -ENOEXEC;
 291         }
 292
 293 -       *location = (*location & ~0x03ffffff) | ((ofs + (v >> 2)) & 0x03ffffff);
 294 +       *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
 295
 296         return 0;
 297  }
 298
 299 -static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
 300 -{
 301 -       return set_r_mips_26(me, location, *location & 0x03ffffff, v);
 302 -}
 303 -
 304 -static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
 305 -{
 306 -       return set_r_mips_26(me, location, 0, v);
 307 -}
 308 -
 309  static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
 310  {
 311         struct mips_hi16 *n;
 312 @@ -585,23 +400,11 @@
 313                 list_add(&me->arch.dbe_list, &dbe_list);
 314                 spin_unlock_irq(&dbe_lock);
 315         }
 316 -
 317 -       /* Get rid of the fixup trampoline if we're running the module
 318 -        * from physically mapped address space */
 319 -       if (me->arch.core_plt_offset == 0 &&
 320 -           me->arch.init_plt_offset == me->arch.core_plt_size &&
 321 -           is_phys_addr(me->module_core)) {
 322 -               kfree(me->arch.plt_tbl);
 323 -               me->arch.plt_tbl = NULL;
 324 -       }
 325 -
 326         return 0;
 327  }
 328
 329  void module_arch_cleanup(struct module *mod)
 330  {
 331 -       if (mod->arch.plt_tbl)
 332 -               kfree(mod->arch.plt_tbl);
 333         spin_lock_irq(&dbe_lock);
 334         list_del(&mod->arch.dbe_list);
 335         spin_unlock_irq(&dbe_lock);