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/bootmem.h> 24 #include <linux/memblock.h> 25 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 38 #include "setup.h" 39 40 #undef DEBUG 41 42 #ifdef DEBUG 43 #define DBG(fmt...) printk(fmt) 44 #else 45 #define DBG(fmt...) 46 #endif 47 48 /* Max supported size for symbol names */ 49 #define MAX_SYMNAME 64 50 51 /* The alignment of the vDSO */ 52 #define VDSO_ALIGNMENT (1 << 16) 53 54 extern char vdso32_start, vdso32_end; 55 static void *vdso32_kbase = &vdso32_start; 56 static unsigned int vdso32_pages; 57 static struct page **vdso32_pagelist; 58 unsigned long vdso32_sigtramp; 59 unsigned long vdso32_rt_sigtramp; 60 61 #ifdef CONFIG_PPC64 62 extern char vdso64_start, vdso64_end; 63 static void *vdso64_kbase = &vdso64_start; 64 static unsigned int vdso64_pages; 65 static struct page **vdso64_pagelist; 66 unsigned long vdso64_rt_sigtramp; 67 #endif /* CONFIG_PPC64 */ 68 69 static int vdso_ready; 70 71 /* 72 * The vdso data page (aka. systemcfg for old ppc64 fans) is here. 73 * Once the early boot kernel code no longer needs to muck around 74 * with it, it will become dynamically allocated 75 */ 76 static union { 77 struct vdso_data data; 78 u8 page[PAGE_SIZE]; 79 } vdso_data_store __page_aligned_data; 80 struct vdso_data *vdso_data = &vdso_data_store.data; 81 82 /* Format of the patch table */ 83 struct vdso_patch_def 84 { 85 unsigned long ftr_mask, ftr_value; 86 const char *gen_name; 87 const char *fix_name; 88 }; 89 90 /* Table of functions to patch based on the CPU type/revision 91 * 92 * Currently, we only change sync_dicache to do nothing on processors 93 * with a coherent icache 94 */ 95 static struct vdso_patch_def vdso_patches[] = { 96 { 97 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, 98 "__kernel_sync_dicache", "__kernel_sync_dicache_p5" 99 }, 100 { 101 CPU_FTR_USE_TB, 0, 102 "__kernel_gettimeofday", NULL 103 }, 104 { 105 CPU_FTR_USE_TB, 0, 106 "__kernel_clock_gettime", NULL 107 }, 108 { 109 CPU_FTR_USE_TB, 0, 110 "__kernel_clock_getres", NULL 111 }, 112 { 113 CPU_FTR_USE_TB, 0, 114 "__kernel_get_tbfreq", NULL 115 }, 116 { 117 CPU_FTR_USE_TB, 0, 118 "__kernel_time", NULL 119 }, 120 }; 121 122 /* 123 * Some infos carried around for each of them during parsing at 124 * boot time. 125 */ 126 struct lib32_elfinfo 127 { 128 Elf32_Ehdr *hdr; /* ptr to ELF */ 129 Elf32_Sym *dynsym; /* ptr to .dynsym section */ 130 unsigned long dynsymsize; /* size of .dynsym section */ 131 char *dynstr; /* ptr to .dynstr section */ 132 unsigned long text; /* offset of .text section in .so */ 133 }; 134 135 struct lib64_elfinfo 136 { 137 Elf64_Ehdr *hdr; 138 Elf64_Sym *dynsym; 139 unsigned long dynsymsize; 140 char *dynstr; 141 unsigned long text; 142 }; 143 144 145 #ifdef __DEBUG 146 static void dump_one_vdso_page(struct page *pg, struct page *upg) 147 { 148 printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), 149 page_count(pg), 150 pg->flags); 151 if (upg && !IS_ERR(upg) /* && pg != upg*/) { 152 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) 153 << PAGE_SHIFT), 154 page_count(upg), 155 upg->flags); 156 } 157 printk("\n"); 158 } 159 160 static void dump_vdso_pages(struct vm_area_struct * vma) 161 { 162 int i; 163 164 if (!vma || is_32bit_task()) { 165 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); 166 for (i=0; i<vdso32_pages; i++) { 167 struct page *pg = virt_to_page(vdso32_kbase + 168 i*PAGE_SIZE); 169 struct page *upg = (vma && vma->vm_mm) ? 170 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) 171 : NULL; 172 dump_one_vdso_page(pg, upg); 173 } 174 } 175 if (!vma || !is_32bit_task()) { 176 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); 177 for (i=0; i<vdso64_pages; i++) { 178 struct page *pg = virt_to_page(vdso64_kbase + 179 i*PAGE_SIZE); 180 struct page *upg = (vma && vma->vm_mm) ? 181 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) 182 : NULL; 183 dump_one_vdso_page(pg, upg); 184 } 185 } 186 } 187 #endif /* DEBUG */ 188 189 /* 190 * This is called from binfmt_elf, we create the special vma for the 191 * vDSO and insert it into the mm struct tree 192 */ 193 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 194 { 195 struct mm_struct *mm = current->mm; 196 struct page **vdso_pagelist; 197 unsigned long vdso_pages; 198 unsigned long vdso_base; 199 int rc; 200 201 if (!vdso_ready) 202 return 0; 203 204 #ifdef CONFIG_PPC64 205 if (is_32bit_task()) { 206 vdso_pagelist = vdso32_pagelist; 207 vdso_pages = vdso32_pages; 208 vdso_base = VDSO32_MBASE; 209 } else { 210 vdso_pagelist = vdso64_pagelist; 211 vdso_pages = vdso64_pages; 212 /* 213 * On 64bit we don't have a preferred map address. This 214 * allows get_unmapped_area to find an area near other mmaps 215 * and most likely share a SLB entry. 216 */ 217 vdso_base = 0; 218 } 219 #else 220 vdso_pagelist = vdso32_pagelist; 221 vdso_pages = vdso32_pages; 222 vdso_base = VDSO32_MBASE; 223 #endif 224 225 current->mm->context.vdso_base = 0; 226 227 /* vDSO has a problem and was disabled, just don't "enable" it for the 228 * process 229 */ 230 if (vdso_pages == 0) 231 return 0; 232 /* Add a page to the vdso size for the data page */ 233 vdso_pages ++; 234 235 /* 236 * pick a base address for the vDSO in process space. We try to put it 237 * at vdso_base which is the "natural" base for it, but we might fail 238 * and end up putting it elsewhere. 239 * Add enough to the size so that the result can be aligned. 240 */ 241 down_write(&mm->mmap_sem); 242 vdso_base = get_unmapped_area(NULL, vdso_base, 243 (vdso_pages << PAGE_SHIFT) + 244 ((VDSO_ALIGNMENT - 1) & PAGE_MASK), 245 0, 0); 246 if (IS_ERR_VALUE(vdso_base)) { 247 rc = vdso_base; 248 goto fail_mmapsem; 249 } 250 251 /* Add required alignment. */ 252 vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); 253 254 /* 255 * Put vDSO base into mm struct. We need to do this before calling 256 * install_special_mapping or the perf counter mmap tracking code 257 * will fail to recognise it as a vDSO (since arch_vma_name fails). 258 */ 259 current->mm->context.vdso_base = vdso_base; 260 261 /* 262 * our vma flags don't have VM_WRITE so by default, the process isn't 263 * allowed to write those pages. 264 * gdb can break that with ptrace interface, and thus trigger COW on 265 * those pages but it's then your responsibility to never do that on 266 * the "data" page of the vDSO or you'll stop getting kernel updates 267 * and your nice userland gettimeofday will be totally dead. 268 * It's fine to use that for setting breakpoints in the vDSO code 269 * pages though. 270 */ 271 rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, 272 VM_READ|VM_EXEC| 273 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 274 vdso_pagelist); 275 if (rc) { 276 current->mm->context.vdso_base = 0; 277 goto fail_mmapsem; 278 } 279 280 up_write(&mm->mmap_sem); 281 return 0; 282 283 fail_mmapsem: 284 up_write(&mm->mmap_sem); 285 return rc; 286 } 287 288 const char *arch_vma_name(struct vm_area_struct *vma) 289 { 290 if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) 291 return "[vdso]"; 292 return NULL; 293 } 294 295 296 297 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, 298 unsigned long *size) 299 { 300 Elf32_Shdr *sechdrs; 301 unsigned int i; 302 char *secnames; 303 304 /* Grab section headers and strings so we can tell who is who */ 305 sechdrs = (void *)ehdr + ehdr->e_shoff; 306 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 307 308 /* Find the section they want */ 309 for (i = 1; i < ehdr->e_shnum; i++) { 310 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 311 if (size) 312 *size = sechdrs[i].sh_size; 313 return (void *)ehdr + sechdrs[i].sh_offset; 314 } 315 } 316 *size = 0; 317 return NULL; 318 } 319 320 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, 321 const char *symname) 322 { 323 unsigned int i; 324 char name[MAX_SYMNAME], *c; 325 326 for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { 327 if (lib->dynsym[i].st_name == 0) 328 continue; 329 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 330 MAX_SYMNAME); 331 c = strchr(name, '@'); 332 if (c) 333 *c = 0; 334 if (strcmp(symname, name) == 0) 335 return &lib->dynsym[i]; 336 } 337 return NULL; 338 } 339 340 /* Note that we assume the section is .text and the symbol is relative to 341 * the library base 342 */ 343 static unsigned long __init find_function32(struct lib32_elfinfo *lib, 344 const char *symname) 345 { 346 Elf32_Sym *sym = find_symbol32(lib, symname); 347 348 if (sym == NULL) { 349 printk(KERN_WARNING "vDSO32: function %s not found !\n", 350 symname); 351 return 0; 352 } 353 return sym->st_value - VDSO32_LBASE; 354 } 355 356 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, 357 struct lib64_elfinfo *v64, 358 const char *orig, const char *fix) 359 { 360 Elf32_Sym *sym32_gen, *sym32_fix; 361 362 sym32_gen = find_symbol32(v32, orig); 363 if (sym32_gen == NULL) { 364 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); 365 return -1; 366 } 367 if (fix == NULL) { 368 sym32_gen->st_name = 0; 369 return 0; 370 } 371 sym32_fix = find_symbol32(v32, fix); 372 if (sym32_fix == NULL) { 373 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); 374 return -1; 375 } 376 sym32_gen->st_value = sym32_fix->st_value; 377 sym32_gen->st_size = sym32_fix->st_size; 378 sym32_gen->st_info = sym32_fix->st_info; 379 sym32_gen->st_other = sym32_fix->st_other; 380 sym32_gen->st_shndx = sym32_fix->st_shndx; 381 382 return 0; 383 } 384 385 386 #ifdef CONFIG_PPC64 387 388 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, 389 unsigned long *size) 390 { 391 Elf64_Shdr *sechdrs; 392 unsigned int i; 393 char *secnames; 394 395 /* Grab section headers and strings so we can tell who is who */ 396 sechdrs = (void *)ehdr + ehdr->e_shoff; 397 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; 398 399 /* Find the section they want */ 400 for (i = 1; i < ehdr->e_shnum; i++) { 401 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { 402 if (size) 403 *size = sechdrs[i].sh_size; 404 return (void *)ehdr + sechdrs[i].sh_offset; 405 } 406 } 407 if (size) 408 *size = 0; 409 return NULL; 410 } 411 412 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, 413 const char *symname) 414 { 415 unsigned int i; 416 char name[MAX_SYMNAME], *c; 417 418 for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { 419 if (lib->dynsym[i].st_name == 0) 420 continue; 421 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, 422 MAX_SYMNAME); 423 c = strchr(name, '@'); 424 if (c) 425 *c = 0; 426 if (strcmp(symname, name) == 0) 427 return &lib->dynsym[i]; 428 } 429 return NULL; 430 } 431 432 /* Note that we assume the section is .text and the symbol is relative to 433 * the library base 434 */ 435 static unsigned long __init find_function64(struct lib64_elfinfo *lib, 436 const char *symname) 437 { 438 Elf64_Sym *sym = find_symbol64(lib, symname); 439 440 if (sym == NULL) { 441 printk(KERN_WARNING "vDSO64: function %s not found !\n", 442 symname); 443 return 0; 444 } 445 #ifdef VDS64_HAS_DESCRIPTORS 446 return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - 447 VDSO64_LBASE; 448 #else 449 return sym->st_value - VDSO64_LBASE; 450 #endif 451 } 452 453 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, 454 struct lib64_elfinfo *v64, 455 const char *orig, const char *fix) 456 { 457 Elf64_Sym *sym64_gen, *sym64_fix; 458 459 sym64_gen = find_symbol64(v64, orig); 460 if (sym64_gen == NULL) { 461 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); 462 return -1; 463 } 464 if (fix == NULL) { 465 sym64_gen->st_name = 0; 466 return 0; 467 } 468 sym64_fix = find_symbol64(v64, fix); 469 if (sym64_fix == NULL) { 470 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); 471 return -1; 472 } 473 sym64_gen->st_value = sym64_fix->st_value; 474 sym64_gen->st_size = sym64_fix->st_size; 475 sym64_gen->st_info = sym64_fix->st_info; 476 sym64_gen->st_other = sym64_fix->st_other; 477 sym64_gen->st_shndx = sym64_fix->st_shndx; 478 479 return 0; 480 } 481 482 #endif /* CONFIG_PPC64 */ 483 484 485 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, 486 struct lib64_elfinfo *v64) 487 { 488 void *sect; 489 490 /* 491 * Locate symbol tables & text section 492 */ 493 494 v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); 495 v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); 496 if (v32->dynsym == NULL || v32->dynstr == NULL) { 497 printk(KERN_ERR "vDSO32: required symbol section not found\n"); 498 return -1; 499 } 500 sect = find_section32(v32->hdr, ".text", NULL); 501 if (sect == NULL) { 502 printk(KERN_ERR "vDSO32: the .text section was not found\n"); 503 return -1; 504 } 505 v32->text = sect - vdso32_kbase; 506 507 #ifdef CONFIG_PPC64 508 v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); 509 v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); 510 if (v64->dynsym == NULL || v64->dynstr == NULL) { 511 printk(KERN_ERR "vDSO64: required symbol section not found\n"); 512 return -1; 513 } 514 sect = find_section64(v64->hdr, ".text", NULL); 515 if (sect == NULL) { 516 printk(KERN_ERR "vDSO64: the .text section was not found\n"); 517 return -1; 518 } 519 v64->text = sect - vdso64_kbase; 520 #endif /* CONFIG_PPC64 */ 521 522 return 0; 523 } 524 525 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, 526 struct lib64_elfinfo *v64) 527 { 528 /* 529 * Find signal trampolines 530 */ 531 532 #ifdef CONFIG_PPC64 533 vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); 534 #endif 535 vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); 536 vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); 537 } 538 539 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, 540 struct lib64_elfinfo *v64) 541 { 542 Elf32_Sym *sym32; 543 #ifdef CONFIG_PPC64 544 Elf64_Sym *sym64; 545 546 sym64 = find_symbol64(v64, "__kernel_datapage_offset"); 547 if (sym64 == NULL) { 548 printk(KERN_ERR "vDSO64: Can't find symbol " 549 "__kernel_datapage_offset !\n"); 550 return -1; 551 } 552 *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = 553 (vdso64_pages << PAGE_SHIFT) - 554 (sym64->st_value - VDSO64_LBASE); 555 #endif /* CONFIG_PPC64 */ 556 557 sym32 = find_symbol32(v32, "__kernel_datapage_offset"); 558 if (sym32 == NULL) { 559 printk(KERN_ERR "vDSO32: Can't find symbol " 560 "__kernel_datapage_offset !\n"); 561 return -1; 562 } 563 *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = 564 (vdso32_pages << PAGE_SHIFT) - 565 (sym32->st_value - VDSO32_LBASE); 566 567 return 0; 568 } 569 570 571 static __init int vdso_fixup_features(struct lib32_elfinfo *v32, 572 struct lib64_elfinfo *v64) 573 { 574 void *start32; 575 unsigned long size32; 576 577 #ifdef CONFIG_PPC64 578 void *start64; 579 unsigned long size64; 580 581 start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); 582 if (start64) 583 do_feature_fixups(cur_cpu_spec->cpu_features, 584 start64, start64 + size64); 585 586 start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64); 587 if (start64) 588 do_feature_fixups(cur_cpu_spec->mmu_features, 589 start64, start64 + size64); 590 591 start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); 592 if (start64) 593 do_feature_fixups(powerpc_firmware_features, 594 start64, start64 + size64); 595 596 start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64); 597 if (start64) 598 do_lwsync_fixups(cur_cpu_spec->cpu_features, 599 start64, start64 + size64); 600 #endif /* CONFIG_PPC64 */ 601 602 start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); 603 if (start32) 604 do_feature_fixups(cur_cpu_spec->cpu_features, 605 start32, start32 + size32); 606 607 start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32); 608 if (start32) 609 do_feature_fixups(cur_cpu_spec->mmu_features, 610 start32, start32 + size32); 611 612 #ifdef CONFIG_PPC64 613 start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); 614 if (start32) 615 do_feature_fixups(powerpc_firmware_features, 616 start32, start32 + size32); 617 #endif /* CONFIG_PPC64 */ 618 619 start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32); 620 if (start32) 621 do_lwsync_fixups(cur_cpu_spec->cpu_features, 622 start32, start32 + size32); 623 624 return 0; 625 } 626 627 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, 628 struct lib64_elfinfo *v64) 629 { 630 int i; 631 632 for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { 633 struct vdso_patch_def *patch = &vdso_patches[i]; 634 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) 635 == patch->ftr_value; 636 if (!match) 637 continue; 638 639 DBG("replacing %s with %s...\n", patch->gen_name, 640 patch->fix_name ? "NONE" : patch->fix_name); 641 642 /* 643 * Patch the 32 bits and 64 bits symbols. Note that we do not 644 * patch the "." symbol on 64 bits. 645 * It would be easy to do, but doesn't seem to be necessary, 646 * patching the OPD symbol is enough. 647 */ 648 vdso_do_func_patch32(v32, v64, patch->gen_name, 649 patch->fix_name); 650 #ifdef CONFIG_PPC64 651 vdso_do_func_patch64(v32, v64, patch->gen_name, 652 patch->fix_name); 653 #endif /* CONFIG_PPC64 */ 654 } 655 656 return 0; 657 } 658 659 660 static __init int vdso_setup(void) 661 { 662 struct lib32_elfinfo v32; 663 struct lib64_elfinfo v64; 664 665 v32.hdr = vdso32_kbase; 666 #ifdef CONFIG_PPC64 667 v64.hdr = vdso64_kbase; 668 #endif 669 if (vdso_do_find_sections(&v32, &v64)) 670 return -1; 671 672 if (vdso_fixup_datapage(&v32, &v64)) 673 return -1; 674 675 if (vdso_fixup_features(&v32, &v64)) 676 return -1; 677 678 if (vdso_fixup_alt_funcs(&v32, &v64)) 679 return -1; 680 681 vdso_setup_trampolines(&v32, &v64); 682 683 return 0; 684 } 685 686 /* 687 * Called from setup_arch to initialize the bitmap of available 688 * syscalls in the systemcfg page 689 */ 690 static void __init vdso_setup_syscall_map(void) 691 { 692 unsigned int i; 693 extern unsigned long *sys_call_table; 694 extern unsigned long sys_ni_syscall; 695 696 697 for (i = 0; i < __NR_syscalls; i++) { 698 #ifdef CONFIG_PPC64 699 if (sys_call_table[i*2] != sys_ni_syscall) 700 vdso_data->syscall_map_64[i >> 5] |= 701 0x80000000UL >> (i & 0x1f); 702 if (sys_call_table[i*2+1] != sys_ni_syscall) 703 vdso_data->syscall_map_32[i >> 5] |= 704 0x80000000UL >> (i & 0x1f); 705 #else /* CONFIG_PPC64 */ 706 if (sys_call_table[i] != sys_ni_syscall) 707 vdso_data->syscall_map_32[i >> 5] |= 708 0x80000000UL >> (i & 0x1f); 709 #endif /* CONFIG_PPC64 */ 710 } 711 } 712 713 #ifdef CONFIG_PPC64 714 int vdso_getcpu_init(void) 715 { 716 unsigned long cpu, node, val; 717 718 /* 719 * SPRG3 contains the CPU in the bottom 16 bits and the NUMA node in 720 * the next 16 bits. The VDSO uses this to implement getcpu(). 721 */ 722 cpu = get_cpu(); 723 WARN_ON_ONCE(cpu > 0xffff); 724 725 node = cpu_to_node(cpu); 726 WARN_ON_ONCE(node > 0xffff); 727 728 val = (cpu & 0xfff) | ((node & 0xffff) << 16); 729 mtspr(SPRN_SPRG3, val); 730 get_paca()->sprg3 = val; 731 732 put_cpu(); 733 734 return 0; 735 } 736 /* We need to call this before SMP init */ 737 early_initcall(vdso_getcpu_init); 738 #endif 739 740 static int __init vdso_init(void) 741 { 742 int i; 743 744 #ifdef CONFIG_PPC64 745 /* 746 * Fill up the "systemcfg" stuff for backward compatibility 747 */ 748 strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); 749 vdso_data->version.major = SYSTEMCFG_MAJOR; 750 vdso_data->version.minor = SYSTEMCFG_MINOR; 751 vdso_data->processor = mfspr(SPRN_PVR); 752 /* 753 * Fake the old platform number for pSeries and add 754 * in LPAR bit if necessary 755 */ 756 vdso_data->platform = 0x100; 757 if (firmware_has_feature(FW_FEATURE_LPAR)) 758 vdso_data->platform |= 1; 759 vdso_data->physicalMemorySize = memblock_phys_mem_size(); 760 vdso_data->dcache_size = ppc64_caches.dsize; 761 vdso_data->dcache_line_size = ppc64_caches.dline_size; 762 vdso_data->icache_size = ppc64_caches.isize; 763 vdso_data->icache_line_size = ppc64_caches.iline_size; 764 765 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ 766 vdso_data->dcache_block_size = ppc64_caches.dline_size; 767 vdso_data->icache_block_size = ppc64_caches.iline_size; 768 vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; 769 vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; 770 771 /* 772 * Calculate the size of the 64 bits vDSO 773 */ 774 vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; 775 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); 776 #else 777 vdso_data->dcache_block_size = L1_CACHE_BYTES; 778 vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; 779 vdso_data->icache_block_size = L1_CACHE_BYTES; 780 vdso_data->icache_log_block_size = L1_CACHE_SHIFT; 781 #endif /* CONFIG_PPC64 */ 782 783 784 /* 785 * Calculate the size of the 32 bits vDSO 786 */ 787 vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; 788 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); 789 790 791 /* 792 * Setup the syscall map in the vDOS 793 */ 794 vdso_setup_syscall_map(); 795 796 /* 797 * Initialize the vDSO images in memory, that is do necessary 798 * fixups of vDSO symbols, locate trampolines, etc... 799 */ 800 if (vdso_setup()) { 801 printk(KERN_ERR "vDSO setup failure, not enabled !\n"); 802 vdso32_pages = 0; 803 #ifdef CONFIG_PPC64 804 vdso64_pages = 0; 805 #endif 806 return 0; 807 } 808 809 /* Make sure pages are in the correct state */ 810 vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), 811 GFP_KERNEL); 812 BUG_ON(vdso32_pagelist == NULL); 813 for (i = 0; i < vdso32_pages; i++) { 814 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); 815 ClearPageReserved(pg); 816 get_page(pg); 817 vdso32_pagelist[i] = pg; 818 } 819 vdso32_pagelist[i++] = virt_to_page(vdso_data); 820 vdso32_pagelist[i] = NULL; 821 822 #ifdef CONFIG_PPC64 823 vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), 824 GFP_KERNEL); 825 BUG_ON(vdso64_pagelist == NULL); 826 for (i = 0; i < vdso64_pages; i++) { 827 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); 828 ClearPageReserved(pg); 829 get_page(pg); 830 vdso64_pagelist[i] = pg; 831 } 832 vdso64_pagelist[i++] = virt_to_page(vdso_data); 833 vdso64_pagelist[i] = NULL; 834 #endif /* CONFIG_PPC64 */ 835 836 get_page(virt_to_page(vdso_data)); 837 838 smp_wmb(); 839 vdso_ready = 1; 840 841 return 0; 842 } 843 arch_initcall(vdso_init); 844 845 int in_gate_area_no_mm(unsigned long addr) 846 { 847 return 0; 848 } 849 850 int in_gate_area(struct mm_struct *mm, unsigned long addr) 851 { 852 return 0; 853 } 854 855 struct vm_area_struct *get_gate_vma(struct mm_struct *mm) 856 { 857 return NULL; 858 } 859 860