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/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/memblock.h>
  24
  25 #include <asm/cpu_has_feature.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/processor.h>
  28 #include <asm/mmu.h>
  29 #include <asm/mmu_context.h>
  30 #include <asm/prom.h>
  31 #include <asm/machdep.h>
  32 #include <asm/cputable.h>
  33 #include <asm/sections.h>
  34 #include <asm/firmware.h>
  35 #include <asm/vdso.h>
  36 #include <asm/vdso_datapage.h>
  37 #include <asm/setup.h>
  38
  39 #undef DEBUG
  40
  41 #ifdef DEBUG
  42 #define DBG(fmt...) printk(fmt)
  43 #else
  44 #define DBG(fmt...)
  45 #endif
  46
  47 /* Max supported size for symbol names */
  48 #define MAX_SYMNAME     64
  49
  50 /* The alignment of the vDSO */
  51 #define VDSO_ALIGNMENT  (1 << 16)
  52
  53 static unsigned int vdso32_pages;
  54 static void *vdso32_kbase;
  55 static struct page **vdso32_pagelist;
  56 unsigned long vdso32_sigtramp;
  57 unsigned long vdso32_rt_sigtramp;
  58
  59 #ifdef CONFIG_VDSO32
  60 extern char vdso32_start, vdso32_end;
  61 #endif
  62
  63 #ifdef CONFIG_PPC64
  64 extern char vdso64_start, vdso64_end;
  65 static void *vdso64_kbase = &vdso64_start;
  66 static unsigned int vdso64_pages;
  67 static struct page **vdso64_pagelist;
  68 unsigned long vdso64_rt_sigtramp;
  69 #endif /* CONFIG_PPC64 */
  70
  71 static int vdso_ready;
  72
  73 /*
  74  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
  75  * Once the early boot kernel code no longer needs to muck around
  76  * with it, it will become dynamically allocated
  77  */
  78 static union {
  79         struct vdso_data        data;
  80         u8                      page[PAGE_SIZE];
  81 } vdso_data_store __page_aligned_data;
  82 struct vdso_data *vdso_data = &vdso_data_store.data;
  83
  84 /* Format of the patch table */
  85 struct vdso_patch_def
  86 {
  87         unsigned long   ftr_mask, ftr_value;
  88         const char      *gen_name;
  89         const char      *fix_name;
  90 };
  91
  92 /* Table of functions to patch based on the CPU type/revision
  93  *
  94  * Currently, we only change sync_dicache to do nothing on processors
  95  * with a coherent icache
  96  */
  97 static struct vdso_patch_def vdso_patches[] = {
  98         {
  99                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
 100                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
 101         },
 102 #ifdef CONFIG_PPC32
 103         {
 104                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 105                 "__kernel_gettimeofday", NULL
 106         },
 107         {
 108                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 109                 "__kernel_clock_gettime", NULL
 110         },
 111         {
 112                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 113                 "__kernel_clock_getres", NULL
 114         },
 115         {
 116                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 117                 "__kernel_get_tbfreq", NULL
 118         },
 119         {
 120                 CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 121                 "__kernel_time", NULL
 122         },
 123 #endif
 124 };
 125
 126 /*
 127  * Some infos carried around for each of them during parsing at
 128  * boot time.
 129  */
 130 struct lib32_elfinfo
 131 {
 132         Elf32_Ehdr      *hdr;           /* ptr to ELF */
 133         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
 134         unsigned long   dynsymsize;     /* size of .dynsym section */
 135         char            *dynstr;        /* ptr to .dynstr section */
 136         unsigned long   text;           /* offset of .text section in .so */
 137 };
 138
 139 struct lib64_elfinfo
 140 {
 141         Elf64_Ehdr      *hdr;
 142         Elf64_Sym       *dynsym;
 143         unsigned long   dynsymsize;
 144         char            *dynstr;
 145         unsigned long   text;
 146 };
 147
 148
 149 /*
 150  * This is called from binfmt_elf, we create the special vma for the
 151  * vDSO and insert it into the mm struct tree
 152  */
 153 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 154 {
 155         struct mm_struct *mm = current->mm;
 156         struct page **vdso_pagelist;
 157         unsigned long vdso_pages;
 158         unsigned long vdso_base;
 159         int rc;
 160
 161         if (!vdso_ready)
 162                 return 0;
 163
 164 #ifdef CONFIG_PPC64
 165         if (is_32bit_task()) {
 166                 vdso_pagelist = vdso32_pagelist;
 167                 vdso_pages = vdso32_pages;
 168                 vdso_base = VDSO32_MBASE;
 169         } else {
 170                 vdso_pagelist = vdso64_pagelist;
 171                 vdso_pages = vdso64_pages;
 172                 /*
 173                  * On 64bit we don't have a preferred map address. This
 174                  * allows get_unmapped_area to find an area near other mmaps
 175                  * and most likely share a SLB entry.
 176                  */
 177                 vdso_base = 0;
 178         }
 179 #else
 180         vdso_pagelist = vdso32_pagelist;
 181         vdso_pages = vdso32_pages;
 182         vdso_base = VDSO32_MBASE;
 183 #endif
 184
 185         current->mm->context.vdso_base = 0;
 186
 187         /* vDSO has a problem and was disabled, just don't "enable" it for the
 188          * process
 189          */
 190         if (vdso_pages == 0)
 191                 return 0;
 192         /* Add a page to the vdso size for the data page */
 193         vdso_pages ++;
 194
 195         /*
 196          * pick a base address for the vDSO in process space. We try to put it
 197          * at vdso_base which is the "natural" base for it, but we might fail
 198          * and end up putting it elsewhere.
 199          * Add enough to the size so that the result can be aligned.
 200          */
 201         if (down_write_killable(&mm->mmap_sem))
 202                 return -EINTR;
 203         vdso_base = get_unmapped_area(NULL, vdso_base,
 204                                       (vdso_pages << PAGE_SHIFT) +
 205                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 206                                       0, 0);
 207         if (IS_ERR_VALUE(vdso_base)) {
 208                 rc = vdso_base;
 209                 goto fail_mmapsem;
 210         }
 211
 212         /* Add required alignment. */
 213         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
 214
 215         /*
 216          * Put vDSO base into mm struct. We need to do this before calling
 217          * install_special_mapping or the perf counter mmap tracking code
 218          * will fail to recognise it as a vDSO (since arch_vma_name fails).
 219          */
 220         current->mm->context.vdso_base = vdso_base;
 221
 222         /*
 223          * our vma flags don't have VM_WRITE so by default, the process isn't
 224          * allowed to write those pages.
 225          * gdb can break that with ptrace interface, and thus trigger COW on
 226          * those pages but it's then your responsibility to never do that on
 227          * the "data" page of the vDSO or you'll stop getting kernel updates
 228          * and your nice userland gettimeofday will be totally dead.
 229          * It's fine to use that for setting breakpoints in the vDSO code
 230          * pages though.
 231          */
 232         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 233                                      VM_READ|VM_EXEC|
 234                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 235                                      vdso_pagelist);
 236         if (rc) {
 237                 current->mm->context.vdso_base = 0;
 238                 goto fail_mmapsem;
 239         }
 240
 241         up_write(&mm->mmap_sem);
 242         return 0;
 243
 244  fail_mmapsem:
 245         up_write(&mm->mmap_sem);
 246         return rc;
 247 }
 248
 249 const char *arch_vma_name(struct vm_area_struct *vma)
 250 {
 251         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
 252                 return "[vdso]";
 253         return NULL;
 254 }
 255
 256
 257
 258 #ifdef CONFIG_VDSO32
 259 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 260                                   unsigned long *size)
 261 {
 262         Elf32_Shdr *sechdrs;
 263         unsigned int i;
 264         char *secnames;
 265
 266         /* Grab section headers and strings so we can tell who is who */
 267         sechdrs = (void *)ehdr + ehdr->e_shoff;
 268         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 269
 270         /* Find the section they want */
 271         for (i = 1; i < ehdr->e_shnum; i++) {
 272                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 273                         if (size)
 274                                 *size = sechdrs[i].sh_size;
 275                         return (void *)ehdr + sechdrs[i].sh_offset;
 276                 }
 277         }
 278         *size = 0;
 279         return NULL;
 280 }
 281
 282 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
 283                                         const char *symname)
 284 {
 285         unsigned int i;
 286         char name[MAX_SYMNAME], *c;
 287
 288         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
 289                 if (lib->dynsym[i].st_name == 0)
 290                         continue;
 291                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 292                         MAX_SYMNAME);
 293                 c = strchr(name, '@');
 294                 if (c)
 295                         *c = 0;
 296                 if (strcmp(symname, name) == 0)
 297                         return &lib->dynsym[i];
 298         }
 299         return NULL;
 300 }
 301
 302 /* Note that we assume the section is .text and the symbol is relative to
 303  * the library base
 304  */
 305 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 306                                             const char *symname)
 307 {
 308         Elf32_Sym *sym = find_symbol32(lib, symname);
 309
 310         if (sym == NULL) {
 311                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
 312                        symname);
 313                 return 0;
 314         }
 315         return sym->st_value - VDSO32_LBASE;
 316 }
 317
 318 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 319                                        struct lib64_elfinfo *v64,
 320                                        const char *orig, const char *fix)
 321 {
 322         Elf32_Sym *sym32_gen, *sym32_fix;
 323
 324         sym32_gen = find_symbol32(v32, orig);
 325         if (sym32_gen == NULL) {
 326                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
 327                 return -1;
 328         }
 329         if (fix == NULL) {
 330                 sym32_gen->st_name = 0;
 331                 return 0;
 332         }
 333         sym32_fix = find_symbol32(v32, fix);
 334         if (sym32_fix == NULL) {
 335                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
 336                 return -1;
 337         }
 338         sym32_gen->st_value = sym32_fix->st_value;
 339         sym32_gen->st_size = sym32_fix->st_size;
 340         sym32_gen->st_info = sym32_fix->st_info;
 341         sym32_gen->st_other = sym32_fix->st_other;
 342         sym32_gen->st_shndx = sym32_fix->st_shndx;
 343
 344         return 0;
 345 }
 346 #else /* !CONFIG_VDSO32 */
 347 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
 348                                             const char *symname)
 349 {
 350         return 0;
 351 }
 352
 353 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
 354                                        struct lib64_elfinfo *v64,
 355                                        const char *orig, const char *fix)
 356 {
 357         return 0;
 358 }
 359 #endif /* CONFIG_VDSO32 */
 360
 361
 362 #ifdef CONFIG_PPC64
 363
 364 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
 365                                   unsigned long *size)
 366 {
 367         Elf64_Shdr *sechdrs;
 368         unsigned int i;
 369         char *secnames;
 370
 371         /* Grab section headers and strings so we can tell who is who */
 372         sechdrs = (void *)ehdr + ehdr->e_shoff;
 373         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
 374
 375         /* Find the section they want */
 376         for (i = 1; i < ehdr->e_shnum; i++) {
 377                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
 378                         if (size)
 379                                 *size = sechdrs[i].sh_size;
 380                         return (void *)ehdr + sechdrs[i].sh_offset;
 381                 }
 382         }
 383         if (size)
 384                 *size = 0;
 385         return NULL;
 386 }
 387
 388 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
 389                                         const char *symname)
 390 {
 391         unsigned int i;
 392         char name[MAX_SYMNAME], *c;
 393
 394         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
 395                 if (lib->dynsym[i].st_name == 0)
 396                         continue;
 397                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
 398                         MAX_SYMNAME);
 399                 c = strchr(name, '@');
 400                 if (c)
 401                         *c = 0;
 402                 if (strcmp(symname, name) == 0)
 403                         return &lib->dynsym[i];
 404         }
 405         return NULL;
 406 }
 407
 408 /* Note that we assume the section is .text and the symbol is relative to
 409  * the library base
 410  */
 411 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
 412                                             const char *symname)
 413 {
 414         Elf64_Sym *sym = find_symbol64(lib, symname);
 415
 416         if (sym == NULL) {
 417                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
 418                        symname);
 419                 return 0;
 420         }
 421 #ifdef VDS64_HAS_DESCRIPTORS
 422         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
 423                 VDSO64_LBASE;
 424 #else
 425         return sym->st_value - VDSO64_LBASE;
 426 #endif
 427 }
 428
 429 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
 430                                        struct lib64_elfinfo *v64,
 431                                        const char *orig, const char *fix)
 432 {
 433         Elf64_Sym *sym64_gen, *sym64_fix;
 434
 435         sym64_gen = find_symbol64(v64, orig);
 436         if (sym64_gen == NULL) {
 437                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
 438                 return -1;
 439         }
 440         if (fix == NULL) {
 441                 sym64_gen->st_name = 0;
 442                 return 0;
 443         }
 444         sym64_fix = find_symbol64(v64, fix);
 445         if (sym64_fix == NULL) {
 446                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
 447                 return -1;
 448         }
 449         sym64_gen->st_value = sym64_fix->st_value;
 450         sym64_gen->st_size = sym64_fix->st_size;
 451         sym64_gen->st_info = sym64_fix->st_info;
 452         sym64_gen->st_other = sym64_fix->st_other;
 453         sym64_gen->st_shndx = sym64_fix->st_shndx;
 454
 455         return 0;
 456 }
 457
 458 #endif /* CONFIG_PPC64 */
 459
 460
 461 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
 462                                         struct lib64_elfinfo *v64)
 463 {
 464         void *sect;
 465
 466         /*
 467          * Locate symbol tables & text section
 468          */
 469
 470 #ifdef CONFIG_VDSO32
 471         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
 472         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
 473         if (v32->dynsym == NULL || v32->dynstr == NULL) {
 474                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
 475                 return -1;
 476         }
 477         sect = find_section32(v32->hdr, ".text", NULL);
 478         if (sect == NULL) {
 479                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
 480                 return -1;
 481         }
 482         v32->text = sect - vdso32_kbase;
 483 #endif
 484
 485 #ifdef CONFIG_PPC64
 486         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
 487         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
 488         if (v64->dynsym == NULL || v64->dynstr == NULL) {
 489                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
 490                 return -1;
 491         }
 492         sect = find_section64(v64->hdr, ".text", NULL);
 493         if (sect == NULL) {
 494                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
 495                 return -1;
 496         }
 497         v64->text = sect - vdso64_kbase;
 498 #endif /* CONFIG_PPC64 */
 499
 500         return 0;
 501 }
 502
 503 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
 504                                           struct lib64_elfinfo *v64)
 505 {
 506         /*
 507          * Find signal trampolines
 508          */
 509
 510 #ifdef CONFIG_PPC64
 511         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
 512 #endif
 513         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
 514         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
 515 }
 516
 517 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
 518                                        struct lib64_elfinfo *v64)
 519 {
 520 #ifdef CONFIG_VDSO32
 521         Elf32_Sym *sym32;
 522 #endif
 523 #ifdef CONFIG_PPC64
 524         Elf64_Sym *sym64;
 525
 526         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
 527         if (sym64 == NULL) {
 528                 printk(KERN_ERR "vDSO64: Can't find symbol "
 529                        "__kernel_datapage_offset !\n");
 530                 return -1;
 531         }
 532         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
 533                 (vdso64_pages << PAGE_SHIFT) -
 534                 (sym64->st_value - VDSO64_LBASE);
 535 #endif /* CONFIG_PPC64 */
 536
 537 #ifdef CONFIG_VDSO32
 538         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
 539         if (sym32 == NULL) {
 540                 printk(KERN_ERR "vDSO32: Can't find symbol "
 541                        "__kernel_datapage_offset !\n");
 542                 return -1;
 543         }
 544         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
 545                 (vdso32_pages << PAGE_SHIFT) -
 546                 (sym32->st_value - VDSO32_LBASE);
 547 #endif
 548
 549         return 0;
 550 }
 551
 552
 553 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
 554                                       struct lib64_elfinfo *v64)
 555 {
 556         unsigned long size;
 557         void *start;
 558
 559 #ifdef CONFIG_PPC64
 560         start = find_section64(v64->hdr, "__ftr_fixup", &size);
 561         if (start)
 562                 do_feature_fixups(cur_cpu_spec->cpu_features,
 563                                   start, start + size);
 564
 565         start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
 566         if (start)
 567                 do_feature_fixups(cur_cpu_spec->mmu_features,
 568                                   start, start + size);
 569
 570         start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
 571         if (start)
 572                 do_feature_fixups(powerpc_firmware_features,
 573                                   start, start + size);
 574
 575         start = find_section64(v64->hdr, "__lwsync_fixup", &size);
 576         if (start)
 577                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 578                                  start, start + size);
 579 #endif /* CONFIG_PPC64 */
 580
 581 #ifdef CONFIG_VDSO32
 582         start = find_section32(v32->hdr, "__ftr_fixup", &size);
 583         if (start)
 584                 do_feature_fixups(cur_cpu_spec->cpu_features,
 585                                   start, start + size);
 586
 587         start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
 588         if (start)
 589                 do_feature_fixups(cur_cpu_spec->mmu_features,
 590                                   start, start + size);
 591
 592 #ifdef CONFIG_PPC64
 593         start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
 594         if (start)
 595                 do_feature_fixups(powerpc_firmware_features,
 596                                   start, start + size);
 597 #endif /* CONFIG_PPC64 */
 598
 599         start = find_section32(v32->hdr, "__lwsync_fixup", &size);
 600         if (start)
 601                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
 602                                  start, start + size);
 603 #endif
 604
 605         return 0;
 606 }
 607
 608 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
 609                                        struct lib64_elfinfo *v64)
 610 {
 611         int i;
 612
 613         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
 614                 struct vdso_patch_def *patch = &vdso_patches[i];
 615                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
 616                         == patch->ftr_value;
 617                 if (!match)
 618                         continue;
 619
 620                 DBG("replacing %s with %s...\n", patch->gen_name,
 621                     patch->fix_name ? "NONE" : patch->fix_name);
 622
 623                 /*
 624                  * Patch the 32 bits and 64 bits symbols. Note that we do not
 625                  * patch the "." symbol on 64 bits.
 626                  * It would be easy to do, but doesn't seem to be necessary,
 627                  * patching the OPD symbol is enough.
 628                  */
 629                 vdso_do_func_patch32(v32, v64, patch->gen_name,
 630                                      patch->fix_name);
 631 #ifdef CONFIG_PPC64
 632                 vdso_do_func_patch64(v32, v64, patch->gen_name,
 633                                      patch->fix_name);
 634 #endif /* CONFIG_PPC64 */
 635         }
 636
 637         return 0;
 638 }
 639
 640
 641 static __init int vdso_setup(void)
 642 {
 643         struct lib32_elfinfo    v32;
 644         struct lib64_elfinfo    v64;
 645
 646         v32.hdr = vdso32_kbase;
 647 #ifdef CONFIG_PPC64
 648         v64.hdr = vdso64_kbase;
 649 #endif
 650         if (vdso_do_find_sections(&v32, &v64))
 651                 return -1;
 652
 653         if (vdso_fixup_datapage(&v32, &v64))
 654                 return -1;
 655
 656         if (vdso_fixup_features(&v32, &v64))
 657                 return -1;
 658
 659         if (vdso_fixup_alt_funcs(&v32, &v64))
 660                 return -1;
 661
 662         vdso_setup_trampolines(&v32, &v64);
 663
 664         return 0;
 665 }
 666
 667 /*
 668  * Called from setup_arch to initialize the bitmap of available
 669  * syscalls in the systemcfg page
 670  */
 671 static void __init vdso_setup_syscall_map(void)
 672 {
 673         unsigned int i;
 674         extern unsigned long *sys_call_table;
 675         extern unsigned long sys_ni_syscall;
 676
 677
 678         for (i = 0; i < NR_syscalls; i++) {
 679 #ifdef CONFIG_PPC64
 680                 if (sys_call_table[i*2] != sys_ni_syscall)
 681                         vdso_data->syscall_map_64[i >> 5] |=
 682                                 0x80000000UL >> (i & 0x1f);
 683                 if (sys_call_table[i*2+1] != sys_ni_syscall)
 684                         vdso_data->syscall_map_32[i >> 5] |=
 685                                 0x80000000UL >> (i & 0x1f);
 686 #else /* CONFIG_PPC64 */
 687                 if (sys_call_table[i] != sys_ni_syscall)
 688                         vdso_data->syscall_map_32[i >> 5] |=
 689                                 0x80000000UL >> (i & 0x1f);
 690 #endif /* CONFIG_PPC64 */
 691         }
 692 }
 693
 694 #ifdef CONFIG_PPC64
 695 int vdso_getcpu_init(void)
 696 {
 697         unsigned long cpu, node, val;
 698
 699         /*
 700          * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
 701          * in the next 16 bits.  The VDSO uses this to implement getcpu().
 702          */
 703         cpu = get_cpu();
 704         WARN_ON_ONCE(cpu > 0xffff);
 705
 706         node = cpu_to_node(cpu);
 707         WARN_ON_ONCE(node > 0xffff);
 708
 709         val = (cpu & 0xfff) | ((node & 0xffff) << 16);
 710         mtspr(SPRN_SPRG_VDSO_WRITE, val);
 711         get_paca()->sprg_vdso = val;
 712
 713         put_cpu();
 714
 715         return 0;
 716 }
 717 /* We need to call this before SMP init */
 718 early_initcall(vdso_getcpu_init);
 719 #endif
 720
 721 static int __init vdso_init(void)
 722 {
 723         int i;
 724
 725 #ifdef CONFIG_PPC64
 726         /*
 727          * Fill up the "systemcfg" stuff for backward compatibility
 728          */
 729         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
 730         vdso_data->version.major = SYSTEMCFG_MAJOR;
 731         vdso_data->version.minor = SYSTEMCFG_MINOR;
 732         vdso_data->processor = mfspr(SPRN_PVR);
 733         /*
 734          * Fake the old platform number for pSeries and add
 735          * in LPAR bit if necessary
 736          */
 737         vdso_data->platform = 0x100;
 738         if (firmware_has_feature(FW_FEATURE_LPAR))
 739                 vdso_data->platform |= 1;
 740         vdso_data->physicalMemorySize = memblock_phys_mem_size();
 741         vdso_data->dcache_size = ppc64_caches.l1d.size;
 742         vdso_data->dcache_line_size = ppc64_caches.l1d.line_size;
 743         vdso_data->icache_size = ppc64_caches.l1i.size;
 744         vdso_data->icache_line_size = ppc64_caches.l1i.line_size;
 745         vdso_data->dcache_block_size = ppc64_caches.l1d.block_size;
 746         vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
 747         vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
 748         vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
 749
 750         /*
 751          * Calculate the size of the 64 bits vDSO
 752          */
 753         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
 754         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
 755 #else
 756         vdso_data->dcache_block_size = L1_CACHE_BYTES;
 757         vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
 758         vdso_data->icache_block_size = L1_CACHE_BYTES;
 759         vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
 760 #endif /* CONFIG_PPC64 */
 761
 762
 763 #ifdef CONFIG_VDSO32
 764         vdso32_kbase = &vdso32_start;
 765
 766         /*
 767          * Calculate the size of the 32 bits vDSO
 768          */
 769         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
 770         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
 771 #endif
 772
 773
 774         /*
 775          * Setup the syscall map in the vDOS
 776          */
 777         vdso_setup_syscall_map();
 778
 779         /*
 780          * Initialize the vDSO images in memory, that is do necessary
 781          * fixups of vDSO symbols, locate trampolines, etc...
 782          */
 783         if (vdso_setup()) {
 784                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
 785                 vdso32_pages = 0;
 786 #ifdef CONFIG_PPC64
 787                 vdso64_pages = 0;
 788 #endif
 789                 return 0;
 790         }
 791
 792 #ifdef CONFIG_VDSO32
 793         /* Make sure pages are in the correct state */
 794         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
 795                                   GFP_KERNEL);
 796         BUG_ON(vdso32_pagelist == NULL);
 797         for (i = 0; i < vdso32_pages; i++) {
 798                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
 799                 ClearPageReserved(pg);
 800                 get_page(pg);
 801                 vdso32_pagelist[i] = pg;
 802         }
 803         vdso32_pagelist[i++] = virt_to_page(vdso_data);
 804         vdso32_pagelist[i] = NULL;
 805 #endif
 806
 807 #ifdef CONFIG_PPC64
 808         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
 809                                   GFP_KERNEL);
 810         BUG_ON(vdso64_pagelist == NULL);
 811         for (i = 0; i < vdso64_pages; i++) {
 812                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
 813                 ClearPageReserved(pg);
 814                 get_page(pg);
 815                 vdso64_pagelist[i] = pg;
 816         }
 817         vdso64_pagelist[i++] = virt_to_page(vdso_data);
 818         vdso64_pagelist[i] = NULL;
 819 #endif /* CONFIG_PPC64 */
 820
 821         get_page(virt_to_page(vdso_data));
 822
 823         smp_wmb();
 824         vdso_ready = 1;
 825
 826         return 0;
 827 }
 828 arch_initcall(vdso_init);