arch/powerpc/kernel/vdso.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
   5  *                       <benh@kernel.crashing.org>
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/smp.h>
  13 #include <linux/stddef.h>
  14 #include <linux/unistd.h>
  15 #include <linux/slab.h>
  16 #include <linux/user.h>
  17 #include <linux/elf.h>
  18 #include <linux/security.h>
  19 #include <linux/memblock.h>
  20
  21 #include <asm/pgtable.h>
  22 #include <asm/processor.h>
  23 #include <asm/mmu.h>
  24 #include <asm/mmu_context.h>
  25 #include <asm/prom.h>
  26 #include <asm/machdep.h>
  27 #include <asm/cputable.h>
  28 #include <asm/sections.h>
  29 #include <asm/firmware.h>
  30 #include <asm/vdso.h>
  31 #include <asm/vdso_datapage.h>
  32 #include <asm/setup.h>
  33
  34 #undef DEBUG
  35
  36 #ifdef DEBUG
  37 #define DBG(fmt...) printk(fmt)
  38 #else
  39 #define DBG(fmt...)
  40 #endif
  41
  42 /* Max supported size for symbol names */
  43 #define MAX_SYMNAME     64
  44
  45 /* The alignment of the vDSO */
  46 #define VDSO_ALIGNMENT  (1 << 16)
  47
  48 static unsigned int vdso32_pages;
  49 static void *vdso32_kbase;
  50 static struct page **vdso32_pagelist;
  51 unsigned long vdso32_sigtramp;
  52 unsigned long vdso32_rt_sigtramp;
  53
  54 #ifdef CONFIG_VDSO32
  55 extern char vdso32_start, vdso32_end;
  56 #endif
  57
  58 #ifdef CONFIG_PPC64
  59 extern char vdso64_start, vdso64_end;
  60 static void *vdso64_kbase = &vdso64_start;
  61 static unsigned int vdso64_pages;
  62 static struct page **vdso64_pagelist;
  63 unsigned long vdso64_rt_sigtramp;
  64 #endif /* CONFIG_PPC64 */
  65
  66 static int vdso_ready;
  67
  68 /*
  69  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
  70  * Once the early boot kernel code no longer needs to muck around
  71  * with it, it will become dynamically allocated
  72  */
  73 static union {
  74         struct vdso_data        data;
  75         u8                      page[PAGE_SIZE];
  76 } vdso_data_store __page_aligned_data;
  77 struct vdso_data *vdso_data = &vdso_data_store.data;
  78
  79 /* Format of the patch table */
  80 struct vdso_patch_def
  81 {
  82         unsigned long   ftr_mask, ftr_value;
  83         const char      *gen_name;
  84         const char      *fix_name;
  85 };
  86
  87 /* Table of functions to patch based on the CPU type/revision
  88  *
  89  * Currently, we only change sync_dicache to do nothing on processors
  90  * with a coherent icache
  91  */
  92 static struct vdso_patch_def vdso_patches[] = {
  93         {
  94                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
  95                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
  96         },
  97 };
  98
  99 /*
 100  * Some infos carried around for each of them during parsing at
 101  * boot time.
 102  */
 103 struct lib32_elfinfo
 104 {
 105         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 106         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 107         unsigned long   dynsymsize;     /* size of .dynsym section */
 108         char            *dynstr;        /* ptr to .dynstr section */
 109         unsigned long   text;           /* offset of .text section in .so */
 110 };
 111
 112 struct lib64_elfinfo
 113 {
 114         Elf64_Ehdr      *hdr;
 115         Elf64_Sym       *dynsym;
 116         unsigned long   dynsymsize;
 117         char            *dynstr;
 118         unsigned long   text;
 119 };
 120
 121
 122 /*
 123  * This is called from binfmt_elf, we create the special vma for the
 124  * vDSO and insert it into the mm struct tree
 125  */
 126 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 127 {
 128         struct mm_struct *mm = current->mm;
 129         struct page **vdso_pagelist;
 130         unsigned long vdso_pages;
 131         unsigned long vdso_base;
 132         int rc;
 133
 134         if (!vdso_ready)
 135                 return 0;
 136
 137 #ifdef CONFIG_PPC64
 138         if (is_32bit_task()) {
 139                 vdso_pagelist = vdso32_pagelist;
 140                 vdso_pages = vdso32_pages;
 141                 vdso_base = VDSO32_MBASE;
 142         } else {
 143                 vdso_pagelist = vdso64_pagelist;
 144                 vdso_pages = vdso64_pages;
 145                 /*
 146                  * On 64bit we don't have a preferred map address. This
 147                  * allows get_unmapped_area to find an area near other mmaps
 148                  * and most likely share a SLB entry.
 149                  */
 150                 vdso_base = 0;
 151         }
 152 #else
 153         vdso_pagelist = vdso32_pagelist;
 154         vdso_pages = vdso32_pages;
 155         vdso_base = VDSO32_MBASE;
 156 #endif
 157
 158         current->mm->context.vdso_base = 0;
 159
 160         /* vDSO has a problem and was disabled, just don't "enable" it for the
 161          * process
 162          */
 163         if (vdso_pages == 0)
 164                 return 0;
 165         /* Add a page to the vdso size for the data page */
 166         vdso_pages ++;
 167
 168         /*
 169          * pick a base address for the vDSO in process space. We try to put it
 170          * at vdso_base which is the "natural" base for it, but we might fail
 171          * and end up putting it elsewhere.
 172          * Add enough to the size so that the result can be aligned.
 173          */
 174         if (down_write_killable(&mm->mmap_sem))
 175                 return -EINTR;
 176         vdso_base = get_unmapped_area(NULL, vdso_base,
 177                                       (vdso_pages << PAGE_SHIFT) +
 178                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 179                                       0, 0);
 180         if (IS_ERR_VALUE(vdso_base)) {
 181                 rc = vdso_base;
 182                 goto fail_mmapsem;
 183         }
 184
 185         /* Add required alignment. */
 186         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
 187
 188         /*
 189          * Put vDSO base into mm struct. We need to do this before calling
 190          * install_special_mapping or the perf counter mmap tracking code
 191          * will fail to recognise it as a vDSO (since arch_vma_name fails).
 192          */
 193         current->mm->context.vdso_base = vdso_base;
 194
 195         /*
 196          * our vma flags don't have VM_WRITE so by default, the process isn't
 197          * allowed to write those pages.
 198          * gdb can break that with ptrace interface, and thus trigger COW on
 199          * those pages but it's then your responsibility to never do that on
 200          * the "data" page of the vDSO or you'll stop getting kernel updates
 201          * and your nice userland gettimeofday will be totally dead.
 202          * It's fine to use that for setting breakpoints in the vDSO code
 203          * pages though.
 204          */
 205         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 206                                      VM_READ|VM_EXEC|
 207                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 208                                      vdso_pagelist);
 209         if (rc) {
 210                 current->mm->context.vdso_base = 0;
 211                 goto fail_mmapsem;
 212         }
 213
 214         up_write(&mm->mmap_sem);
 215         return 0;
 216
 217  fail_mmapsem:
 218         up_write(&mm->mmap_sem);
 219         return rc;
 220 }
 221
 222 const char *arch_vma_name(struct vm_area_struct *vma)
 223 {
 224         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 225                 return "[vdso]";
 226         return NULL;
 227 }
 228
 229
 230
 231 #ifdef CONFIG_VDSO32
 232 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 233                                   unsigned long *size)
 234 {
 235         Elf32_Shdr *sechdrs;
 236         unsigned int i;
 237         char *secnames;
 238
 239         /* Grab section headers and strings so we can tell who is who */
 240         sechdrs = (void *)ehdr + ehdr->e_shoff;
 241         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 242
 243         /* Find the section they want */
 244         for (i = 1; i < ehdr->e_shnum; i++) {
 245                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 246                         if (size)
 247                                 *size = sechdrs[i].sh_size;
 248                         return (void *)ehdr + sechdrs[i].sh_offset;
 249                 }
 250         }
 251         *size = 0;
 252         return NULL;
 253 }
 254
 255 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 256                                         const char *symname)
 257 {
 258         unsigned int i;
 259         char name[MAX_SYMNAME], *c;
 260
 261         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 262                 if (lib->dynsym[i].st_name == 0)
 263                         continue;
 264                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 265                         MAX_SYMNAME);
 266                 c = strchr(name, '@');
 267                 if (c)
 268                         *c = 0;
 269                 if (strcmp(symname, name) == 0)
 270                         return &lib->dynsym[i];
 271         }
 272         return NULL;
 273 }
 274
 275 /* Note that we assume the section is .text and the symbol is relative to
 276  * the library base
 277  */
 278 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 279                                             const char *symname)
 280 {
 281         Elf32_Sym *sym = find_symbol32(lib, symname);
 282
 283         if (sym == NULL) {
 284                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 285                        symname);
 286                 return 0;
 287         }
 288         return sym->st_value - VDSO32_LBASE;
 289 }
 290
 291 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 292                                        struct lib64_elfinfo *v64,
 293                                        const char *orig, const char *fix)
 294 {
 295         Elf32_Sym *sym32_gen, *sym32_fix;
 296
 297         sym32_gen = find_symbol32(v32, orig);
 298         if (sym32_gen == NULL) {
 299                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 300                 return -1;
 301         }
 302         if (fix == NULL) {
 303                 sym32_gen->st_name = 0;
 304                 return 0;
 305         }
 306         sym32_fix = find_symbol32(v32, fix);
 307         if (sym32_fix == NULL) {
 308                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 309                 return -1;
 310         }
 311         sym32_gen->st_value = sym32_fix->st_value;
 312         sym32_gen->st_size = sym32_fix->st_size;
 313         sym32_gen->st_info = sym32_fix->st_info;
 314         sym32_gen->st_other = sym32_fix->st_other;
 315         sym32_gen->st_shndx = sym32_fix->st_shndx;
 316
 317         return 0;
 318 }
 319 #else /* !CONFIG_VDSO32 */
 320 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 321                                             const char *symname)
 322 {
 323         return 0;
 324 }
 325
 326 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 327                                        struct lib64_elfinfo *v64,
 328                                        const char *orig, const char *fix)
 329 {
 330         return 0;
 331 }
 332 #endif /* CONFIG_VDSO32 */
 333
 334
 335 #ifdef CONFIG_PPC64
 336
 337 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 338                                   unsigned long *size)
 339 {
 340         Elf64_Shdr *sechdrs;
 341         unsigned int i;
 342         char *secnames;
 343
 344         /* Grab section headers and strings so we can tell who is who */
 345         sechdrs = (void *)ehdr + ehdr->e_shoff;
 346         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 347
 348         /* Find the section they want */
 349         for (i = 1; i < ehdr->e_shnum; i++) {
 350                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 351                         if (size)
 352                                 *size = sechdrs[i].sh_size;
 353                         return (void *)ehdr + sechdrs[i].sh_offset;
 354                 }
 355         }
 356         if (size)
 357                 *size = 0;
 358         return NULL;
 359 }
 360
 361 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 362                                         const char *symname)
 363 {
 364         unsigned int i;
 365         char name[MAX_SYMNAME], *c;
 366
 367         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 368                 if (lib->dynsym[i].st_name == 0)
 369                         continue;
 370                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 371                         MAX_SYMNAME);
 372                 c = strchr(name, '@');
 373                 if (c)
 374                         *c = 0;
 375                 if (strcmp(symname, name) == 0)
 376                         return &lib->dynsym[i];
 377         }
 378         return NULL;
 379 }
 380
 381 /* Note that we assume the section is .text and the symbol is relative to
 382  * the library base
 383  */
 384 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 385                                             const char *symname)
 386 {
 387         Elf64_Sym *sym = find_symbol64(lib, symname);
 388
 389         if (sym == NULL) {
 390                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 391                        symname);
 392                 return 0;
 393         }
 394         return sym->st_value - VDSO64_LBASE;
 395 }
 396
 397 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 398                                        struct lib64_elfinfo *v64,
 399                                        const char *orig, const char *fix)
 400 {
 401         Elf64_Sym *sym64_gen, *sym64_fix;
 402
 403         sym64_gen = find_symbol64(v64, orig);
 404         if (sym64_gen == NULL) {
 405                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 406                 return -1;
 407         }
 408         if (fix == NULL) {
 409                 sym64_gen->st_name = 0;
 410                 return 0;
 411         }
 412         sym64_fix = find_symbol64(v64, fix);
 413         if (sym64_fix == NULL) {
 414                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 415                 return -1;
 416         }
 417         sym64_gen->st_value = sym64_fix->st_value;
 418         sym64_gen->st_size = sym64_fix->st_size;
 419         sym64_gen->st_info = sym64_fix->st_info;
 420         sym64_gen->st_other = sym64_fix->st_other;
 421         sym64_gen->st_shndx = sym64_fix->st_shndx;
 422
 423         return 0;
 424 }
 425
 426 #endif /* CONFIG_PPC64 */
 427
 428
 429 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 430                                         struct lib64_elfinfo *v64)
 431 {
 432         void *sect;
 433
 434         /*
 435          * Locate symbol tables & text section
 436          */
 437
 438 #ifdef CONFIG_VDSO32
 439         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 440         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 441         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 442                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 443                 return -1;
 444         }
 445         sect = find_section32(v32->hdr, ".text", NULL);
 446         if (sect == NULL) {
 447                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 448                 return -1;
 449         }
 450         v32->text = sect - vdso32_kbase;
 451 #endif
 452
 453 #ifdef CONFIG_PPC64
 454         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 455         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 456         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 457                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 458                 return -1;
 459         }
 460         sect = find_section64(v64->hdr, ".text", NULL);
 461         if (sect == NULL) {
 462                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 463                 return -1;
 464         }
 465         v64->text = sect - vdso64_kbase;
 466 #endif /* CONFIG_PPC64 */
 467
 468         return 0;
 469 }
 470
 471 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 472                                           struct lib64_elfinfo *v64)
 473 {
 474         /*
 475          * Find signal trampolines
 476          */
 477
 478 #ifdef CONFIG_PPC64
 479         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
 480 #endif
 481         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 482         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 483 }
 484
 485 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 486                                        struct lib64_elfinfo *v64)
 487 {
 488 #ifdef CONFIG_VDSO32
 489         Elf32_Sym *sym32;
 490 #endif
 491 #ifdef CONFIG_PPC64
 492         Elf64_Sym *sym64;
 493
 494         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 495         if (sym64 == NULL) {
 496                 printk(KERN_ERR "vDSO64: Can't find symbol "
 497                        "__kernel_datapage_offset !\n");
 498                 return -1;
 499         }
 500         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 501                 (vdso64_pages << PAGE_SHIFT) -
 502                 (sym64->st_value - VDSO64_LBASE);
 503 #endif /* CONFIG_PPC64 */
 504
 505 #ifdef CONFIG_VDSO32
 506         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 507         if (sym32 == NULL) {
 508                 printk(KERN_ERR "vDSO32: Can't find symbol "
 509                        "__kernel_datapage_offset !\n");
 510                 return -1;
 511         }
 512         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 513                 (vdso32_pages << PAGE_SHIFT) -
 514                 (sym32->st_value - VDSO32_LBASE);
 515 #endif
 516
 517         return 0;
 518 }
 519
 520
 521 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 522                                       struct lib64_elfinfo *v64)
 523 {
 524         unsigned long size;
 525         void *start;
 526
 527 #ifdef CONFIG_PPC64
 528         start = find_section64(v64->hdr, "__ftr_fixup", &size);
 529         if (start)
 530                 do_feature_fixups(cur_cpu_spec->cpu_features,
 531                                   start, start + size);
 532
 533         start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
 534         if (start)
 535                 do_feature_fixups(cur_cpu_spec->mmu_features,
 536                                   start, start + size);
 537
 538         start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
 539         if (start)
 540                 do_feature_fixups(powerpc_firmware_features,
 541                                   start, start + size);
 542
 543         start = find_section64(v64->hdr, "__lwsync_fixup", &size);
 544         if (start)
 545                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 546                                  start, start + size);
 547 #endif /* CONFIG_PPC64 */
 548
 549 #ifdef CONFIG_VDSO32
 550         start = find_section32(v32->hdr, "__ftr_fixup", &size);
 551         if (start)
 552                 do_feature_fixups(cur_cpu_spec->cpu_features,
 553                                   start, start + size);
 554
 555         start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
 556         if (start)
 557                 do_feature_fixups(cur_cpu_spec->mmu_features,
 558                                   start, start + size);
 559
 560 #ifdef CONFIG_PPC64
 561         start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
 562         if (start)
 563                 do_feature_fixups(powerpc_firmware_features,
 564                                   start, start + size);
 565 #endif /* CONFIG_PPC64 */
 566
 567         start = find_section32(v32->hdr, "__lwsync_fixup", &size);
 568         if (start)
 569                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 570                                  start, start + size);
 571 #endif
 572
 573         return 0;
 574 }
 575
 576 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 577                                        struct lib64_elfinfo *v64)
 578 {
 579         int i;
 580
 581         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 582                 struct vdso_patch_def *patch = &vdso_patches[i];
 583                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 584                         == patch->ftr_value;
 585                 if (!match)
 586                         continue;
 587
 588                 DBG("replacing %s with %s...\n", patch->gen_name,
 589                     patch->fix_name ? "NONE" : patch->fix_name);
 590
 591                 /*
 592                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 593                  * patch the "." symbol on 64 bits.
 594                  * It would be easy to do, but doesn't seem to be necessary,
 595                  * patching the OPD symbol is enough.
 596                  */
 597                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 598                                      patch->fix_name);
 599 #ifdef CONFIG_PPC64
 600                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 601                                      patch->fix_name);
 602 #endif /* CONFIG_PPC64 */
 603         }
 604
 605         return 0;
 606 }
 607
 608
 609 static __init int vdso_setup(void)
 610 {
 611         struct lib32_elfinfo    v32;
 612         struct lib64_elfinfo    v64;
 613
 614         v32.hdr = vdso32_kbase;
 615 #ifdef CONFIG_PPC64
 616         v64.hdr = vdso64_kbase;
 617 #endif
 618         if (vdso_do_find_sections(&v32, &v64))
 619                 return -1;
 620
 621         if (vdso_fixup_datapage(&v32, &v64))
 622                 return -1;
 623
 624         if (vdso_fixup_features(&v32, &v64))
 625                 return -1;
 626
 627         if (vdso_fixup_alt_funcs(&v32, &v64))
 628                 return -1;
 629
 630         vdso_setup_trampolines(&v32, &v64);
 631
 632         return 0;
 633 }
 634
 635 /*
 636  * Called from setup_arch to initialize the bitmap of available
 637  * syscalls in the systemcfg page
 638  */
 639 static void __init vdso_setup_syscall_map(void)
 640 {
 641         unsigned int i;
 642         extern unsigned long *sys_call_table;
 643 #ifdef CONFIG_PPC64
 644         extern unsigned long *compat_sys_call_table;
 645 #endif
 646         extern unsigned long sys_ni_syscall;
 647
 648
 649         for (i = 0; i < NR_syscalls; i++) {
 650 #ifdef CONFIG_PPC64
 651                 if (sys_call_table[i] != sys_ni_syscall)
 652                         vdso_data->syscall_map_64[i >> 5] |=
 653                                 0x80000000UL >> (i & 0x1f);
 654                 if (IS_ENABLED(CONFIG_COMPAT) &&
 655                     compat_sys_call_table[i] != sys_ni_syscall)
 656                         vdso_data->syscall_map_32[i >> 5] |=
 657                                 0x80000000UL >> (i & 0x1f);
 658 #else /* CONFIG_PPC64 */
 659                 if (sys_call_table[i] != sys_ni_syscall)
 660                         vdso_data->syscall_map_32[i >> 5] |=
 661                                 0x80000000UL >> (i & 0x1f);
 662 #endif /* CONFIG_PPC64 */
 663         }
 664 }
 665
 666 #ifdef CONFIG_PPC64
 667 int vdso_getcpu_init(void)
 668 {
 669         unsigned long cpu, node, val;
 670
 671         /*
 672          * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
 673          * in the next 16 bits.  The VDSO uses this to implement getcpu().
 674          */
 675         cpu = get_cpu();
 676         WARN_ON_ONCE(cpu > 0xffff);
 677
 678         node = cpu_to_node(cpu);
 679         WARN_ON_ONCE(node > 0xffff);
 680
 681         val = (cpu & 0xfff) | ((node & 0xffff) << 16);
 682         mtspr(SPRN_SPRG_VDSO_WRITE, val);
 683         get_paca()->sprg_vdso = val;
 684
 685         put_cpu();
 686
 687         return 0;
 688 }
 689 /* We need to call this before SMP init */
 690 early_initcall(vdso_getcpu_init);
 691 #endif
 692
 693 static int __init vdso_init(void)
 694 {
 695         int i;
 696
 697 #ifdef CONFIG_PPC64
 698         /*
 699          * Fill up the "systemcfg" stuff for backward compatibility
 700          */
 701         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 702         vdso_data->version.major = SYSTEMCFG_MAJOR;
 703         vdso_data->version.minor = SYSTEMCFG_MINOR;
 704         vdso_data->processor = mfspr(SPRN_PVR);
 705         /*
 706          * Fake the old platform number for pSeries and add
 707          * in LPAR bit if necessary
 708          */
 709         vdso_data->platform = 0x100;
 710         if (firmware_has_feature(FW_FEATURE_LPAR))
 711                 vdso_data->platform |= 1;
 712         vdso_data->physicalMemorySize = memblock_phys_mem_size();
 713         vdso_data->dcache_size = ppc64_caches.l1d.size;
 714         vdso_data->dcache_line_size = ppc64_caches.l1d.line_size;
 715         vdso_data->icache_size = ppc64_caches.l1i.size;
 716         vdso_data->icache_line_size = ppc64_caches.l1i.line_size;
 717         vdso_data->dcache_block_size = ppc64_caches.l1d.block_size;
 718         vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
 719         vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
 720         vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
 721
 722         /*
 723          * Calculate the size of the 64 bits vDSO
 724          */
 725         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 726         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
 727 #endif /* CONFIG_PPC64 */
 728
 729
 730 #ifdef CONFIG_VDSO32
 731         vdso32_kbase = &vdso32_start;
 732
 733         /*
 734          * Calculate the size of the 32 bits vDSO
 735          */
 736         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 737         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
 738 #endif
 739
 740
 741         /*
 742          * Setup the syscall map in the vDOS
 743          */
 744         vdso_setup_syscall_map();
 745
 746         /*
 747          * Initialize the vDSO images in memory, that is do necessary
 748          * fixups of vDSO symbols, locate trampolines, etc...
 749          */
 750         if (vdso_setup()) {
 751                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 752                 vdso32_pages = 0;
 753 #ifdef CONFIG_PPC64
 754                 vdso64_pages = 0;
 755 #endif
 756                 return 0;
 757         }
 758
 759 #ifdef CONFIG_VDSO32
 760         /* Make sure pages are in the correct state */
 761         vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *),
 762                                   GFP_KERNEL);
 763         BUG_ON(vdso32_pagelist == NULL);
 764         for (i = 0; i < vdso32_pages; i++) {
 765                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
 766                 get_page(pg);
 767                 vdso32_pagelist[i] = pg;
 768         }
 769         vdso32_pagelist[i++] = virt_to_page(vdso_data);
 770         vdso32_pagelist[i] = NULL;
 771 #endif
 772
 773 #ifdef CONFIG_PPC64
 774         vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *),
 775                                   GFP_KERNEL);
 776         BUG_ON(vdso64_pagelist == NULL);
 777         for (i = 0; i < vdso64_pages; i++) {
 778                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
 779                 get_page(pg);
 780                 vdso64_pagelist[i] = pg;
 781         }
 782         vdso64_pagelist[i++] = virt_to_page(vdso_data);
 783         vdso64_pagelist[i] = NULL;
 784 #endif /* CONFIG_PPC64 */
 785
 786         get_page(virt_to_page(vdso_data));
 787
 788         smp_wmb();
 789         vdso_ready = 1;
 790
 791         return 0;
 792 }
 793 arch_initcall(vdso_init);