arch/powerpc/kernel/vdso.c

   1
   2 /*
   3  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   4  *                       <benh@kernel.crashing.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/smp.h>
  18 #include <linux/stddef.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/user.h>
  22 #include <linux/elf.h>
  23 #include <linux/security.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/lmb.h>
  26
  27 #include <asm/pgtable.h>
  28 #include <asm/system.h>
  29 #include <asm/processor.h>
  30 #include <asm/mmu.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/prom.h>
  33 #include <asm/machdep.h>
  34 #include <asm/cputable.h>
  35 #include <asm/sections.h>
  36 #include <asm/firmware.h>
  37 #include <asm/vdso.h>
  38 #include <asm/vdso_datapage.h>
  39
  40 #include "setup.h"
  41
  42 #undef DEBUG
  43
  44 #ifdef DEBUG
  45 #define DBG(fmt...) printk(fmt)
  46 #else
  47 #define DBG(fmt...)
  48 #endif
  49
  50 /* Max supported size for symbol names */
  51 #define MAX_SYMNAME     64
  52
  53 extern char vdso32_start, vdso32_end;
  54 static void *vdso32_kbase = &vdso32_start;
  55 static unsigned int vdso32_pages;
  56 static struct page **vdso32_pagelist;
  57 unsigned long vdso32_sigtramp;
  58 unsigned long vdso32_rt_sigtramp;
  59
  60 #ifdef CONFIG_PPC64
  61 extern char vdso64_start, vdso64_end;
  62 static void *vdso64_kbase = &vdso64_start;
  63 static unsigned int vdso64_pages;
  64 static struct page **vdso64_pagelist;
  65 unsigned long vdso64_rt_sigtramp;
  66 #endif /* CONFIG_PPC64 */
  67
  68 static int vdso_ready;
  69
  70 /*
  71  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
  72  * Once the early boot kernel code no longer needs to muck around
  73  * with it, it will become dynamically allocated
  74  */
  75 static union {
  76         struct vdso_data        data;
  77         u8                      page[PAGE_SIZE];
  78 } vdso_data_store __page_aligned_data;
  79 struct vdso_data *vdso_data = &vdso_data_store.data;
  80
  81 /* Format of the patch table */
  82 struct vdso_patch_def
  83 {
  84         unsigned long   ftr_mask, ftr_value;
  85         const char      *gen_name;
  86         const char      *fix_name;
  87 };
  88
  89 /* Table of functions to patch based on the CPU type/revision
  90  *
  91  * Currently, we only change sync_dicache to do nothing on processors
  92  * with a coherent icache
  93  */
  94 static struct vdso_patch_def vdso_patches[] = {
  95         {
  96                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
  97                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
  98         },
  99         {
 100                 CPU_FTR_USE_TB, 0,
 101                 "__kernel_gettimeofday", NULL
 102         },
 103         {
 104                 CPU_FTR_USE_TB, 0,
 105                 "__kernel_clock_gettime", NULL
 106         },
 107         {
 108                 CPU_FTR_USE_TB, 0,
 109                 "__kernel_clock_getres", NULL
 110         },
 111         {
 112                 CPU_FTR_USE_TB, 0,
 113                 "__kernel_get_tbfreq", NULL
 114         },
 115 };
 116
 117 /*
 118  * Some infos carried around for each of them during parsing at
 119  * boot time.
 120  */
 121 struct lib32_elfinfo
 122 {
 123         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 124         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 125         unsigned long   dynsymsize;     /* size of .dynsym section */
 126         char            *dynstr;        /* ptr to .dynstr section */
 127         unsigned long   text;           /* offset of .text section in .so */
 128 };
 129
 130 struct lib64_elfinfo
 131 {
 132         Elf64_Ehdr      *hdr;
 133         Elf64_Sym       *dynsym;
 134         unsigned long   dynsymsize;
 135         char            *dynstr;
 136         unsigned long   text;
 137 };
 138
 139
 140 #ifdef __DEBUG
 141 static void dump_one_vdso_page(struct page *pg, struct page *upg)
 142 {
 143         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
 144                page_count(pg),
 145                pg->flags);
 146         if (upg && !IS_ERR(upg) /* && pg != upg*/) {
 147                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
 148                                                        << PAGE_SHIFT),
 149                        page_count(upg),
 150                        upg->flags);
 151         }
 152         printk("\n");
 153 }
 154
 155 static void dump_vdso_pages(struct vm_area_struct * vma)
 156 {
 157         int i;
 158
 159         if (!vma || test_thread_flag(TIF_32BIT)) {
 160                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
 161                 for (i=0; i<vdso32_pages; i++) {
 162                         struct page *pg = virt_to_page(vdso32_kbase +
 163                                                        i*PAGE_SIZE);
 164                         struct page *upg = (vma && vma->vm_mm) ?
 165                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
 166                                 : NULL;
 167                         dump_one_vdso_page(pg, upg);
 168                 }
 169         }
 170         if (!vma || !test_thread_flag(TIF_32BIT)) {
 171                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
 172                 for (i=0; i<vdso64_pages; i++) {
 173                         struct page *pg = virt_to_page(vdso64_kbase +
 174                                                        i*PAGE_SIZE);
 175                         struct page *upg = (vma && vma->vm_mm) ?
 176                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
 177                                 : NULL;
 178                         dump_one_vdso_page(pg, upg);
 179                 }
 180         }
 181 }
 182 #endif /* DEBUG */
 183
 184 /*
 185  * This is called from binfmt_elf, we create the special vma for the
 186  * vDSO and insert it into the mm struct tree
 187  */
 188 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 189 {
 190         struct mm_struct *mm = current->mm;
 191         struct page **vdso_pagelist;
 192         unsigned long vdso_pages;
 193         unsigned long vdso_base;
 194         int rc;
 195
 196         if (!vdso_ready)
 197                 return 0;
 198
 199 #ifdef CONFIG_PPC64
 200         if (test_thread_flag(TIF_32BIT)) {
 201                 vdso_pagelist = vdso32_pagelist;
 202                 vdso_pages = vdso32_pages;
 203                 vdso_base = VDSO32_MBASE;
 204         } else {
 205                 vdso_pagelist = vdso64_pagelist;
 206                 vdso_pages = vdso64_pages;
 207                 /*
 208                  * On 64bit we don't have a preferred map address. This
 209                  * allows get_unmapped_area to find an area near other mmaps
 210                  * and most likely share a SLB entry.
 211                  */
 212                 vdso_base = 0;
 213         }
 214 #else
 215         vdso_pagelist = vdso32_pagelist;
 216         vdso_pages = vdso32_pages;
 217         vdso_base = VDSO32_MBASE;
 218 #endif
 219
 220         current->mm->context.vdso_base = 0;
 221
 222         /* vDSO has a problem and was disabled, just don't "enable" it for the
 223          * process
 224          */
 225         if (vdso_pages == 0)
 226                 return 0;
 227         /* Add a page to the vdso size for the data page */
 228         vdso_pages ++;
 229
 230         /*
 231          * pick a base address for the vDSO in process space. We try to put it
 232          * at vdso_base which is the "natural" base for it, but we might fail
 233          * and end up putting it elsewhere.
 234          */
 235         down_write(&mm->mmap_sem);
 236         vdso_base = get_unmapped_area(NULL, vdso_base,
 237                                       vdso_pages << PAGE_SHIFT, 0, 0);
 238         if (IS_ERR_VALUE(vdso_base)) {
 239                 rc = vdso_base;
 240                 goto fail_mmapsem;
 241         }
 242
 243         /*
 244          * our vma flags don't have VM_WRITE so by default, the process isn't
 245          * allowed to write those pages.
 246          * gdb can break that with ptrace interface, and thus trigger COW on
 247          * those pages but it's then your responsibility to never do that on
 248          * the "data" page of the vDSO or you'll stop getting kernel updates
 249          * and your nice userland gettimeofday will be totally dead.
 250          * It's fine to use that for setting breakpoints in the vDSO code
 251          * pages though
 252          *
 253          * Make sure the vDSO gets into every core dump.
 254          * Dumping its contents makes post-mortem fully interpretable later
 255          * without matching up the same kernel and hardware config to see
 256          * what PC values meant.
 257          */
 258         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 259                                      VM_READ|VM_EXEC|
 260                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
 261                                      VM_ALWAYSDUMP,
 262                                      vdso_pagelist);
 263         if (rc)
 264                 goto fail_mmapsem;
 265
 266         /* Put vDSO base into mm struct */
 267         current->mm->context.vdso_base = vdso_base;
 268
 269         up_write(&mm->mmap_sem);
 270         return 0;
 271
 272  fail_mmapsem:
 273         up_write(&mm->mmap_sem);
 274         return rc;
 275 }
 276
 277 const char *arch_vma_name(struct vm_area_struct *vma)
 278 {
 279         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 280                 return "[vdso]";
 281         return NULL;
 282 }
 283
 284
 285
 286 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 287                                   unsigned long *size)
 288 {
 289         Elf32_Shdr *sechdrs;
 290         unsigned int i;
 291         char *secnames;
 292
 293         /* Grab section headers and strings so we can tell who is who */
 294         sechdrs = (void *)ehdr + ehdr->e_shoff;
 295         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 296
 297         /* Find the section they want */
 298         for (i = 1; i < ehdr->e_shnum; i++) {
 299                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 300                         if (size)
 301                                 *size = sechdrs[i].sh_size;
 302                         return (void *)ehdr + sechdrs[i].sh_offset;
 303                 }
 304         }
 305         *size = 0;
 306         return NULL;
 307 }
 308
 309 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 310                                         const char *symname)
 311 {
 312         unsigned int i;
 313         char name[MAX_SYMNAME], *c;
 314
 315         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 316                 if (lib->dynsym[i].st_name == 0)
 317                         continue;
 318                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 319                         MAX_SYMNAME);
 320                 c = strchr(name, '@');
 321                 if (c)
 322                         *c = 0;
 323                 if (strcmp(symname, name) == 0)
 324                         return &lib->dynsym[i];
 325         }
 326         return NULL;
 327 }
 328
 329 /* Note that we assume the section is .text and the symbol is relative to
 330  * the library base
 331  */
 332 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 333                                             const char *symname)
 334 {
 335         Elf32_Sym *sym = find_symbol32(lib, symname);
 336
 337         if (sym == NULL) {
 338                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 339                        symname);
 340                 return 0;
 341         }
 342         return sym->st_value - VDSO32_LBASE;
 343 }
 344
 345 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 346                                        struct lib64_elfinfo *v64,
 347                                        const char *orig, const char *fix)
 348 {
 349         Elf32_Sym *sym32_gen, *sym32_fix;
 350
 351         sym32_gen = find_symbol32(v32, orig);
 352         if (sym32_gen == NULL) {
 353                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 354                 return -1;
 355         }
 356         if (fix == NULL) {
 357                 sym32_gen->st_name = 0;
 358                 return 0;
 359         }
 360         sym32_fix = find_symbol32(v32, fix);
 361         if (sym32_fix == NULL) {
 362                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 363                 return -1;
 364         }
 365         sym32_gen->st_value = sym32_fix->st_value;
 366         sym32_gen->st_size = sym32_fix->st_size;
 367         sym32_gen->st_info = sym32_fix->st_info;
 368         sym32_gen->st_other = sym32_fix->st_other;
 369         sym32_gen->st_shndx = sym32_fix->st_shndx;
 370
 371         return 0;
 372 }
 373
 374
 375 #ifdef CONFIG_PPC64
 376
 377 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 378                                   unsigned long *size)
 379 {
 380         Elf64_Shdr *sechdrs;
 381         unsigned int i;
 382         char *secnames;
 383
 384         /* Grab section headers and strings so we can tell who is who */
 385         sechdrs = (void *)ehdr + ehdr->e_shoff;
 386         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 387
 388         /* Find the section they want */
 389         for (i = 1; i < ehdr->e_shnum; i++) {
 390                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 391                         if (size)
 392                                 *size = sechdrs[i].sh_size;
 393                         return (void *)ehdr + sechdrs[i].sh_offset;
 394                 }
 395         }
 396         if (size)
 397                 *size = 0;
 398         return NULL;
 399 }
 400
 401 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 402                                         const char *symname)
 403 {
 404         unsigned int i;
 405         char name[MAX_SYMNAME], *c;
 406
 407         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 408                 if (lib->dynsym[i].st_name == 0)
 409                         continue;
 410                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 411                         MAX_SYMNAME);
 412                 c = strchr(name, '@');
 413                 if (c)
 414                         *c = 0;
 415                 if (strcmp(symname, name) == 0)
 416                         return &lib->dynsym[i];
 417         }
 418         return NULL;
 419 }
 420
 421 /* Note that we assume the section is .text and the symbol is relative to
 422  * the library base
 423  */
 424 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 425                                             const char *symname)
 426 {
 427         Elf64_Sym *sym = find_symbol64(lib, symname);
 428
 429         if (sym == NULL) {
 430                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 431                        symname);
 432                 return 0;
 433         }
 434 #ifdef VDS64_HAS_DESCRIPTORS
 435         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
 436                 VDSO64_LBASE;
 437 #else
 438         return sym->st_value - VDSO64_LBASE;
 439 #endif
 440 }
 441
 442 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 443                                        struct lib64_elfinfo *v64,
 444                                        const char *orig, const char *fix)
 445 {
 446         Elf64_Sym *sym64_gen, *sym64_fix;
 447
 448         sym64_gen = find_symbol64(v64, orig);
 449         if (sym64_gen == NULL) {
 450                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 451                 return -1;
 452         }
 453         if (fix == NULL) {
 454                 sym64_gen->st_name = 0;
 455                 return 0;
 456         }
 457         sym64_fix = find_symbol64(v64, fix);
 458         if (sym64_fix == NULL) {
 459                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 460                 return -1;
 461         }
 462         sym64_gen->st_value = sym64_fix->st_value;
 463         sym64_gen->st_size = sym64_fix->st_size;
 464         sym64_gen->st_info = sym64_fix->st_info;
 465         sym64_gen->st_other = sym64_fix->st_other;
 466         sym64_gen->st_shndx = sym64_fix->st_shndx;
 467
 468         return 0;
 469 }
 470
 471 #endif /* CONFIG_PPC64 */
 472
 473
 474 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 475                                         struct lib64_elfinfo *v64)
 476 {
 477         void *sect;
 478
 479         /*
 480          * Locate symbol tables & text section
 481          */
 482
 483         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 484         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 485         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 486                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 487                 return -1;
 488         }
 489         sect = find_section32(v32->hdr, ".text", NULL);
 490         if (sect == NULL) {
 491                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 492                 return -1;
 493         }
 494         v32->text = sect - vdso32_kbase;
 495
 496 #ifdef CONFIG_PPC64
 497         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 498         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 499         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 500                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 501                 return -1;
 502         }
 503         sect = find_section64(v64->hdr, ".text", NULL);
 504         if (sect == NULL) {
 505                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 506                 return -1;
 507         }
 508         v64->text = sect - vdso64_kbase;
 509 #endif /* CONFIG_PPC64 */
 510
 511         return 0;
 512 }
 513
 514 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 515                                           struct lib64_elfinfo *v64)
 516 {
 517         /*
 518          * Find signal trampolines
 519          */
 520
 521 #ifdef CONFIG_PPC64
 522         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
 523 #endif
 524         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 525         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 526 }
 527
 528 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 529                                        struct lib64_elfinfo *v64)
 530 {
 531         Elf32_Sym *sym32;
 532 #ifdef CONFIG_PPC64
 533         Elf64_Sym *sym64;
 534
 535         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 536         if (sym64 == NULL) {
 537                 printk(KERN_ERR "vDSO64: Can't find symbol "
 538                        "__kernel_datapage_offset !\n");
 539                 return -1;
 540         }
 541         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 542                 (vdso64_pages << PAGE_SHIFT) -
 543                 (sym64->st_value - VDSO64_LBASE);
 544 #endif /* CONFIG_PPC64 */
 545
 546         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 547         if (sym32 == NULL) {
 548                 printk(KERN_ERR "vDSO32: Can't find symbol "
 549                        "__kernel_datapage_offset !\n");
 550                 return -1;
 551         }
 552         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 553                 (vdso32_pages << PAGE_SHIFT) -
 554                 (sym32->st_value - VDSO32_LBASE);
 555
 556         return 0;
 557 }
 558
 559
 560 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 561                                       struct lib64_elfinfo *v64)
 562 {
 563         void *start32;
 564         unsigned long size32;
 565
 566 #ifdef CONFIG_PPC64
 567         void *start64;
 568         unsigned long size64;
 569
 570         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
 571         if (start64)
 572                 do_feature_fixups(cur_cpu_spec->cpu_features,
 573                                   start64, start64 + size64);
 574
 575         start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64);
 576         if (start64)
 577                 do_feature_fixups(cur_cpu_spec->mmu_features,
 578                                   start64, start64 + size64);
 579
 580         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
 581         if (start64)
 582                 do_feature_fixups(powerpc_firmware_features,
 583                                   start64, start64 + size64);
 584
 585         start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64);
 586         if (start64)
 587                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 588                                  start64, start64 + size64);
 589 #endif /* CONFIG_PPC64 */
 590
 591         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
 592         if (start32)
 593                 do_feature_fixups(cur_cpu_spec->cpu_features,
 594                                   start32, start32 + size32);
 595
 596         start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32);
 597         if (start32)
 598                 do_feature_fixups(cur_cpu_spec->mmu_features,
 599                                   start32, start32 + size32);
 600
 601 #ifdef CONFIG_PPC64
 602         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
 603         if (start32)
 604                 do_feature_fixups(powerpc_firmware_features,
 605                                   start32, start32 + size32);
 606 #endif /* CONFIG_PPC64 */
 607
 608         start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32);
 609         if (start32)
 610                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 611                                  start32, start32 + size32);
 612
 613         return 0;
 614 }
 615
 616 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 617                                        struct lib64_elfinfo *v64)
 618 {
 619         int i;
 620
 621         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 622                 struct vdso_patch_def *patch = &vdso_patches[i];
 623                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 624                         == patch->ftr_value;
 625                 if (!match)
 626                         continue;
 627
 628                 DBG("replacing %s with %s...\n", patch->gen_name,
 629                     patch->fix_name ? "NONE" : patch->fix_name);
 630
 631                 /*
 632                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 633                  * patch the "." symbol on 64 bits.
 634                  * It would be easy to do, but doesn't seem to be necessary,
 635                  * patching the OPD symbol is enough.
 636                  */
 637                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 638                                      patch->fix_name);
 639 #ifdef CONFIG_PPC64
 640                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 641                                      patch->fix_name);
 642 #endif /* CONFIG_PPC64 */
 643         }
 644
 645         return 0;
 646 }
 647
 648
 649 static __init int vdso_setup(void)
 650 {
 651         struct lib32_elfinfo    v32;
 652         struct lib64_elfinfo    v64;
 653
 654         v32.hdr = vdso32_kbase;
 655 #ifdef CONFIG_PPC64
 656         v64.hdr = vdso64_kbase;
 657 #endif
 658         if (vdso_do_find_sections(&v32, &v64))
 659                 return -1;
 660
 661         if (vdso_fixup_datapage(&v32, &v64))
 662                 return -1;
 663
 664         if (vdso_fixup_features(&v32, &v64))
 665                 return -1;
 666
 667         if (vdso_fixup_alt_funcs(&v32, &v64))
 668                 return -1;
 669
 670         vdso_setup_trampolines(&v32, &v64);
 671
 672         return 0;
 673 }
 674
 675 /*
 676  * Called from setup_arch to initialize the bitmap of available
 677  * syscalls in the systemcfg page
 678  */
 679 static void __init vdso_setup_syscall_map(void)
 680 {
 681         unsigned int i;
 682         extern unsigned long *sys_call_table;
 683         extern unsigned long sys_ni_syscall;
 684
 685
 686         for (i = 0; i < __NR_syscalls; i++) {
 687 #ifdef CONFIG_PPC64
 688                 if (sys_call_table[i*2] != sys_ni_syscall)
 689                         vdso_data->syscall_map_64[i >> 5] |=
 690                                 0x80000000UL >> (i & 0x1f);
 691                 if (sys_call_table[i*2+1] != sys_ni_syscall)
 692                         vdso_data->syscall_map_32[i >> 5] |=
 693                                 0x80000000UL >> (i & 0x1f);
 694 #else /* CONFIG_PPC64 */
 695                 if (sys_call_table[i] != sys_ni_syscall)
 696                         vdso_data->syscall_map_32[i >> 5] |=
 697                                 0x80000000UL >> (i & 0x1f);
 698 #endif /* CONFIG_PPC64 */
 699         }
 700 }
 701
 702
 703 static int __init vdso_init(void)
 704 {
 705         int i;
 706
 707 #ifdef CONFIG_PPC64
 708         /*
 709          * Fill up the "systemcfg" stuff for backward compatiblity
 710          */
 711         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 712         vdso_data->version.major = SYSTEMCFG_MAJOR;
 713         vdso_data->version.minor = SYSTEMCFG_MINOR;
 714         vdso_data->processor = mfspr(SPRN_PVR);
 715         /*
 716          * Fake the old platform number for pSeries and iSeries and add
 717          * in LPAR bit if necessary
 718          */
 719         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
 720         if (firmware_has_feature(FW_FEATURE_LPAR))
 721                 vdso_data->platform |= 1;
 722         vdso_data->physicalMemorySize = lmb_phys_mem_size();
 723         vdso_data->dcache_size = ppc64_caches.dsize;
 724         vdso_data->dcache_line_size = ppc64_caches.dline_size;
 725         vdso_data->icache_size = ppc64_caches.isize;
 726         vdso_data->icache_line_size = ppc64_caches.iline_size;
 727
 728         /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
 729         vdso_data->dcache_block_size = ppc64_caches.dline_size;
 730         vdso_data->icache_block_size = ppc64_caches.iline_size;
 731         vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
 732         vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
 733
 734         /*
 735          * Calculate the size of the 64 bits vDSO
 736          */
 737         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 738         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
 739 #else
 740         vdso_data->dcache_block_size = L1_CACHE_BYTES;
 741         vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
 742         vdso_data->icache_block_size = L1_CACHE_BYTES;
 743         vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
 744 #endif /* CONFIG_PPC64 */
 745
 746
 747         /*
 748          * Calculate the size of the 32 bits vDSO
 749          */
 750         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 751         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
 752
 753
 754         /*
 755          * Setup the syscall map in the vDOS
 756          */
 757         vdso_setup_syscall_map();
 758
 759         /*
 760          * Initialize the vDSO images in memory, that is do necessary
 761          * fixups of vDSO symbols, locate trampolines, etc...
 762          */
 763         if (vdso_setup()) {
 764                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 765                 vdso32_pages = 0;
 766 #ifdef CONFIG_PPC64
 767                 vdso64_pages = 0;
 768 #endif
 769                 return 0;
 770         }
 771
 772         /* Make sure pages are in the correct state */
 773         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
 774                                   GFP_KERNEL);
 775         BUG_ON(vdso32_pagelist == NULL);
 776         for (i = 0; i < vdso32_pages; i++) {
 777                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
 778                 ClearPageReserved(pg);
 779                 get_page(pg);
 780                 vdso32_pagelist[i] = pg;
 781         }
 782         vdso32_pagelist[i++] = virt_to_page(vdso_data);
 783         vdso32_pagelist[i] = NULL;
 784
 785 #ifdef CONFIG_PPC64
 786         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
 787                                   GFP_KERNEL);
 788         BUG_ON(vdso64_pagelist == NULL);
 789         for (i = 0; i < vdso64_pages; i++) {
 790                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
 791                 ClearPageReserved(pg);
 792                 get_page(pg);
 793                 vdso64_pagelist[i] = pg;
 794         }
 795         vdso64_pagelist[i++] = virt_to_page(vdso_data);
 796         vdso64_pagelist[i] = NULL;
 797 #endif /* CONFIG_PPC64 */
 798
 799         get_page(virt_to_page(vdso_data));
 800
 801         smp_wmb();
 802         vdso_ready = 1;
 803
 804         return 0;
 805 }
 806 arch_initcall(vdso_init);
 807
 808 int in_gate_area_no_task(unsigned long addr)
 809 {
 810         return 0;
 811 }
 812
 813 int in_gate_area(struct task_struct *task, unsigned long addr)
 814 {
 815         return 0;
 816 }
 817
 818 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
 819 {
 820         return NULL;
 821 }
 822