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