arch/powerpc/kernel/vdso.c

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