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a7f290da BH |
1 | /* |
2 | * linux/arch/ppc64/kernel/vdso.c | |
3 | * | |
4 | * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. | |
5 | * <benh@kernel.crashing.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/smp_lock.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/user.h> | |
25 | #include <linux/elf.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/bootmem.h> | |
28 | ||
29 | #include <asm/pgtable.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/mmu.h> | |
33 | #include <asm/mmu_context.h> | |
34 | #include <asm/lmb.h> | |
35 | #include <asm/machdep.h> | |
36 | #include <asm/cputable.h> | |
37 | #include <asm/sections.h> | |
38 | #include <asm/vdso.h> | |
39 | #include <asm/vdso_datapage.h> | |
40 | ||
41 | #undef DEBUG | |
42 | ||
43 | #ifdef DEBUG | |
44 | #define DBG(fmt...) printk(fmt) | |
45 | #else | |
46 | #define DBG(fmt...) | |
47 | #endif | |
48 | ||
49 | /* Max supported size for symbol names */ | |
50 | #define MAX_SYMNAME 64 | |
51 | ||
52 | extern char vdso32_start, vdso32_end; | |
53 | static void *vdso32_kbase = &vdso32_start; | |
54 | unsigned int vdso32_pages; | |
55 | unsigned long vdso32_sigtramp; | |
56 | unsigned long vdso32_rt_sigtramp; | |
57 | ||
58 | #ifdef CONFIG_PPC64 | |
59 | extern char vdso64_start, vdso64_end; | |
60 | static void *vdso64_kbase = &vdso64_start; | |
61 | unsigned int vdso64_pages; | |
62 | unsigned long vdso64_rt_sigtramp; | |
63 | #endif /* CONFIG_PPC64 */ | |
64 | ||
65 | /* | |
66 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
67 | * Once the early boot kernel code no longer needs to muck around | |
68 | * with it, it will become dynamically allocated | |
69 | */ | |
70 | static union { | |
71 | struct vdso_data data; | |
72 | u8 page[PAGE_SIZE]; | |
73 | } vdso_data_store __attribute__((__section__(".data.page_aligned"))); | |
74 | struct vdso_data *vdso_data = &vdso_data_store.data; | |
75 | ||
76 | /* Format of the patch table */ | |
77 | struct vdso_patch_def | |
78 | { | |
79 | unsigned long ftr_mask, ftr_value; | |
80 | const char *gen_name; | |
81 | const char *fix_name; | |
82 | }; | |
83 | ||
84 | /* Table of functions to patch based on the CPU type/revision | |
85 | * | |
86 | * Currently, we only change sync_dicache to do nothing on processors | |
87 | * with a coherent icache | |
88 | */ | |
89 | static struct vdso_patch_def vdso_patches[] = { | |
90 | { | |
91 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
92 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
93 | }, | |
94 | { | |
95 | CPU_FTR_USE_TB, 0, | |
96 | "__kernel_gettimeofday", NULL | |
97 | }, | |
98 | }; | |
99 | ||
100 | /* | |
101 | * Some infos carried around for each of them during parsing at | |
102 | * boot time. | |
103 | */ | |
104 | struct lib32_elfinfo | |
105 | { | |
106 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
107 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
108 | unsigned long dynsymsize; /* size of .dynsym section */ | |
109 | char *dynstr; /* ptr to .dynstr section */ | |
110 | unsigned long text; /* offset of .text section in .so */ | |
111 | }; | |
112 | ||
113 | struct lib64_elfinfo | |
114 | { | |
115 | Elf64_Ehdr *hdr; | |
116 | Elf64_Sym *dynsym; | |
117 | unsigned long dynsymsize; | |
118 | char *dynstr; | |
119 | unsigned long text; | |
120 | }; | |
121 | ||
122 | ||
123 | #ifdef __DEBUG | |
124 | static void dump_one_vdso_page(struct page *pg, struct page *upg) | |
125 | { | |
126 | printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), | |
127 | page_count(pg), | |
128 | pg->flags); | |
129 | if (upg/* && pg != upg*/) { | |
130 | printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) | |
131 | << PAGE_SHIFT), | |
132 | page_count(upg), | |
133 | upg->flags); | |
134 | } | |
135 | printk("\n"); | |
136 | } | |
137 | ||
138 | static void dump_vdso_pages(struct vm_area_struct * vma) | |
139 | { | |
140 | int i; | |
141 | ||
142 | if (!vma || test_thread_flag(TIF_32BIT)) { | |
143 | printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); | |
144 | for (i=0; i<vdso32_pages; i++) { | |
145 | struct page *pg = virt_to_page(vdso32_kbase + | |
146 | i*PAGE_SIZE); | |
147 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 148 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
149 | : NULL; |
150 | dump_one_vdso_page(pg, upg); | |
151 | } | |
152 | } | |
153 | if (!vma || !test_thread_flag(TIF_32BIT)) { | |
154 | printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); | |
155 | for (i=0; i<vdso64_pages; i++) { | |
156 | struct page *pg = virt_to_page(vdso64_kbase + | |
157 | i*PAGE_SIZE); | |
158 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 159 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
160 | : NULL; |
161 | dump_one_vdso_page(pg, upg); | |
162 | } | |
163 | } | |
164 | } | |
165 | #endif /* DEBUG */ | |
166 | ||
167 | /* | |
168 | * Keep a dummy vma_close for now, it will prevent VMA merging. | |
169 | */ | |
170 | static void vdso_vma_close(struct vm_area_struct * vma) | |
171 | { | |
172 | } | |
173 | ||
174 | /* | |
175 | * Our nopage() function, maps in the actual vDSO kernel pages, they will | |
176 | * be mapped read-only by do_no_page(), and eventually COW'ed, either | |
177 | * right away for an initial write access, or by do_wp_page(). | |
178 | */ | |
179 | static struct page * vdso_vma_nopage(struct vm_area_struct * vma, | |
180 | unsigned long address, int *type) | |
181 | { | |
182 | unsigned long offset = address - vma->vm_start; | |
183 | struct page *pg; | |
184 | #ifdef CONFIG_PPC64 | |
185 | void *vbase = test_thread_flag(TIF_32BIT) ? | |
186 | vdso32_kbase : vdso64_kbase; | |
187 | #else | |
188 | void *vbase = vdso32_kbase; | |
189 | #endif | |
190 | ||
191 | DBG("vdso_vma_nopage(current: %s, address: %016lx, off: %lx)\n", | |
192 | current->comm, address, offset); | |
193 | ||
194 | if (address < vma->vm_start || address > vma->vm_end) | |
195 | return NOPAGE_SIGBUS; | |
196 | ||
197 | /* | |
198 | * Last page is systemcfg. | |
199 | */ | |
200 | if ((vma->vm_end - address) <= PAGE_SIZE) | |
201 | pg = virt_to_page(vdso_data); | |
202 | else | |
203 | pg = virt_to_page(vbase + offset); | |
204 | ||
205 | get_page(pg); | |
206 | DBG(" ->page count: %d\n", page_count(pg)); | |
207 | ||
208 | return pg; | |
209 | } | |
210 | ||
211 | static struct vm_operations_struct vdso_vmops = { | |
212 | .close = vdso_vma_close, | |
213 | .nopage = vdso_vma_nopage, | |
214 | }; | |
215 | ||
216 | /* | |
217 | * This is called from binfmt_elf, we create the special vma for the | |
218 | * vDSO and insert it into the mm struct tree | |
219 | */ | |
220 | int arch_setup_additional_pages(struct linux_binprm *bprm, | |
221 | int executable_stack) | |
222 | { | |
223 | struct mm_struct *mm = current->mm; | |
224 | struct vm_area_struct *vma; | |
225 | unsigned long vdso_pages; | |
226 | unsigned long vdso_base; | |
227 | ||
228 | #ifdef CONFIG_PPC64 | |
229 | if (test_thread_flag(TIF_32BIT)) { | |
230 | vdso_pages = vdso32_pages; | |
231 | vdso_base = VDSO32_MBASE; | |
232 | } else { | |
233 | vdso_pages = vdso64_pages; | |
234 | vdso_base = VDSO64_MBASE; | |
235 | } | |
236 | #else | |
237 | vdso_pages = vdso32_pages; | |
238 | vdso_base = VDSO32_MBASE; | |
239 | #endif | |
240 | ||
241 | current->thread.vdso_base = 0; | |
242 | ||
243 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
244 | * process | |
245 | */ | |
246 | if (vdso_pages == 0) | |
247 | return 0; | |
248 | ||
249 | vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL); | |
250 | if (vma == NULL) | |
251 | return -ENOMEM; | |
252 | ||
253 | memset(vma, 0, sizeof(*vma)); | |
254 | ||
255 | /* Add a page to the vdso size for the data page */ | |
256 | vdso_pages ++; | |
257 | ||
258 | /* | |
259 | * pick a base address for the vDSO in process space. We try to put it | |
260 | * at vdso_base which is the "natural" base for it, but we might fail | |
261 | * and end up putting it elsewhere. | |
262 | */ | |
263 | vdso_base = get_unmapped_area(NULL, vdso_base, | |
264 | vdso_pages << PAGE_SHIFT, 0, 0); | |
265 | if (vdso_base & ~PAGE_MASK) { | |
266 | kmem_cache_free(vm_area_cachep, vma); | |
267 | return (int)vdso_base; | |
268 | } | |
269 | ||
270 | current->thread.vdso_base = vdso_base; | |
271 | ||
272 | vma->vm_mm = mm; | |
273 | vma->vm_start = current->thread.vdso_base; | |
274 | vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT); | |
275 | ||
276 | /* | |
277 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
278 | * allowed to write those pages. | |
279 | * gdb can break that with ptrace interface, and thus trigger COW on | |
280 | * those pages but it's then your responsibility to never do that on | |
281 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
282 | * and your nice userland gettimeofday will be totally dead. | |
283 | * It's fine to use that for setting breakpoints in the vDSO code | |
284 | * pages though | |
285 | */ | |
0b14c179 | 286 | vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
a7f290da BH |
287 | vma->vm_flags |= mm->def_flags; |
288 | vma->vm_page_prot = protection_map[vma->vm_flags & 0x7]; | |
289 | vma->vm_ops = &vdso_vmops; | |
290 | ||
291 | down_write(&mm->mmap_sem); | |
292 | if (insert_vm_struct(mm, vma)) { | |
293 | up_write(&mm->mmap_sem); | |
294 | kmem_cache_free(vm_area_cachep, vma); | |
295 | return -ENOMEM; | |
296 | } | |
297 | mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
298 | up_write(&mm->mmap_sem); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, | |
304 | unsigned long *size) | |
305 | { | |
306 | Elf32_Shdr *sechdrs; | |
307 | unsigned int i; | |
308 | char *secnames; | |
309 | ||
310 | /* Grab section headers and strings so we can tell who is who */ | |
311 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
312 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
313 | ||
314 | /* Find the section they want */ | |
315 | for (i = 1; i < ehdr->e_shnum; i++) { | |
316 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
317 | if (size) | |
318 | *size = sechdrs[i].sh_size; | |
319 | return (void *)ehdr + sechdrs[i].sh_offset; | |
320 | } | |
321 | } | |
322 | *size = 0; | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
327 | const char *symname) | |
328 | { | |
329 | unsigned int i; | |
330 | char name[MAX_SYMNAME], *c; | |
331 | ||
332 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
333 | if (lib->dynsym[i].st_name == 0) | |
334 | continue; | |
335 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
336 | MAX_SYMNAME); | |
337 | c = strchr(name, '@'); | |
338 | if (c) | |
339 | *c = 0; | |
340 | if (strcmp(symname, name) == 0) | |
341 | return &lib->dynsym[i]; | |
342 | } | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | /* Note that we assume the section is .text and the symbol is relative to | |
347 | * the library base | |
348 | */ | |
349 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
350 | const char *symname) | |
351 | { | |
352 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
353 | ||
354 | if (sym == NULL) { | |
355 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
356 | symname); | |
357 | return 0; | |
358 | } | |
359 | return sym->st_value - VDSO32_LBASE; | |
360 | } | |
361 | ||
362 | static int vdso_do_func_patch32(struct lib32_elfinfo *v32, | |
363 | struct lib64_elfinfo *v64, | |
364 | const char *orig, const char *fix) | |
365 | { | |
366 | Elf32_Sym *sym32_gen, *sym32_fix; | |
367 | ||
368 | sym32_gen = find_symbol32(v32, orig); | |
369 | if (sym32_gen == NULL) { | |
370 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
371 | return -1; | |
372 | } | |
373 | if (fix == NULL) { | |
374 | sym32_gen->st_name = 0; | |
375 | return 0; | |
376 | } | |
377 | sym32_fix = find_symbol32(v32, fix); | |
378 | if (sym32_fix == NULL) { | |
379 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
380 | return -1; | |
381 | } | |
382 | sym32_gen->st_value = sym32_fix->st_value; | |
383 | sym32_gen->st_size = sym32_fix->st_size; | |
384 | sym32_gen->st_info = sym32_fix->st_info; | |
385 | sym32_gen->st_other = sym32_fix->st_other; | |
386 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | ||
392 | #ifdef CONFIG_PPC64 | |
393 | ||
394 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
395 | unsigned long *size) | |
396 | { | |
397 | Elf64_Shdr *sechdrs; | |
398 | unsigned int i; | |
399 | char *secnames; | |
400 | ||
401 | /* Grab section headers and strings so we can tell who is who */ | |
402 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
403 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
404 | ||
405 | /* Find the section they want */ | |
406 | for (i = 1; i < ehdr->e_shnum; i++) { | |
407 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
408 | if (size) | |
409 | *size = sechdrs[i].sh_size; | |
410 | return (void *)ehdr + sechdrs[i].sh_offset; | |
411 | } | |
412 | } | |
413 | if (size) | |
414 | *size = 0; | |
415 | return NULL; | |
416 | } | |
417 | ||
418 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
419 | const char *symname) | |
420 | { | |
421 | unsigned int i; | |
422 | char name[MAX_SYMNAME], *c; | |
423 | ||
424 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
425 | if (lib->dynsym[i].st_name == 0) | |
426 | continue; | |
427 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
428 | MAX_SYMNAME); | |
429 | c = strchr(name, '@'); | |
430 | if (c) | |
431 | *c = 0; | |
432 | if (strcmp(symname, name) == 0) | |
433 | return &lib->dynsym[i]; | |
434 | } | |
435 | return NULL; | |
436 | } | |
437 | ||
438 | /* Note that we assume the section is .text and the symbol is relative to | |
439 | * the library base | |
440 | */ | |
441 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
442 | const char *symname) | |
443 | { | |
444 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
445 | ||
446 | if (sym == NULL) { | |
447 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
448 | symname); | |
449 | return 0; | |
450 | } | |
451 | #ifdef VDS64_HAS_DESCRIPTORS | |
452 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
453 | VDSO64_LBASE; | |
454 | #else | |
455 | return sym->st_value - VDSO64_LBASE; | |
456 | #endif | |
457 | } | |
458 | ||
459 | static int vdso_do_func_patch64(struct lib32_elfinfo *v32, | |
460 | struct lib64_elfinfo *v64, | |
461 | const char *orig, const char *fix) | |
462 | { | |
463 | Elf64_Sym *sym64_gen, *sym64_fix; | |
464 | ||
465 | sym64_gen = find_symbol64(v64, orig); | |
466 | if (sym64_gen == NULL) { | |
467 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
468 | return -1; | |
469 | } | |
470 | if (fix == NULL) { | |
471 | sym64_gen->st_name = 0; | |
472 | return 0; | |
473 | } | |
474 | sym64_fix = find_symbol64(v64, fix); | |
475 | if (sym64_fix == NULL) { | |
476 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
477 | return -1; | |
478 | } | |
479 | sym64_gen->st_value = sym64_fix->st_value; | |
480 | sym64_gen->st_size = sym64_fix->st_size; | |
481 | sym64_gen->st_info = sym64_fix->st_info; | |
482 | sym64_gen->st_other = sym64_fix->st_other; | |
483 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | #endif /* CONFIG_PPC64 */ | |
489 | ||
490 | ||
491 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
492 | struct lib64_elfinfo *v64) | |
493 | { | |
494 | void *sect; | |
495 | ||
496 | /* | |
497 | * Locate symbol tables & text section | |
498 | */ | |
499 | ||
500 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); | |
501 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
502 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
503 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
504 | return -1; | |
505 | } | |
506 | sect = find_section32(v32->hdr, ".text", NULL); | |
507 | if (sect == NULL) { | |
508 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
509 | return -1; | |
510 | } | |
511 | v32->text = sect - vdso32_kbase; | |
512 | ||
513 | #ifdef CONFIG_PPC64 | |
514 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
515 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
516 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
517 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
518 | return -1; | |
519 | } | |
520 | sect = find_section64(v64->hdr, ".text", NULL); | |
521 | if (sect == NULL) { | |
522 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
523 | return -1; | |
524 | } | |
525 | v64->text = sect - vdso64_kbase; | |
526 | #endif /* CONFIG_PPC64 */ | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
532 | struct lib64_elfinfo *v64) | |
533 | { | |
534 | /* | |
535 | * Find signal trampolines | |
536 | */ | |
537 | ||
538 | #ifdef CONFIG_PPC64 | |
539 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
540 | #endif | |
541 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
542 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
543 | } | |
544 | ||
545 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
546 | struct lib64_elfinfo *v64) | |
547 | { | |
548 | Elf32_Sym *sym32; | |
549 | #ifdef CONFIG_PPC64 | |
550 | Elf64_Sym *sym64; | |
551 | ||
552 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
553 | if (sym64 == NULL) { | |
554 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
555 | "__kernel_datapage_offset !\n"); | |
556 | return -1; | |
557 | } | |
558 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
559 | (vdso64_pages << PAGE_SHIFT) - | |
560 | (sym64->st_value - VDSO64_LBASE); | |
561 | #endif /* CONFIG_PPC64 */ | |
562 | ||
563 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); | |
564 | if (sym32 == NULL) { | |
565 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
566 | "__kernel_datapage_offset !\n"); | |
567 | return -1; | |
568 | } | |
569 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
570 | (vdso32_pages << PAGE_SHIFT) - | |
571 | (sym32->st_value - VDSO32_LBASE); | |
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_alt_funcs(&v32, &v64)) | |
625 | return -1; | |
626 | ||
627 | vdso_setup_trampolines(&v32, &v64); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Called from setup_arch to initialize the bitmap of available | |
634 | * syscalls in the systemcfg page | |
635 | */ | |
636 | static void __init vdso_setup_syscall_map(void) | |
637 | { | |
638 | unsigned int i; | |
639 | extern unsigned long *sys_call_table; | |
640 | extern unsigned long sys_ni_syscall; | |
641 | ||
642 | ||
643 | for (i = 0; i < __NR_syscalls; i++) { | |
644 | #ifdef CONFIG_PPC64 | |
645 | if (sys_call_table[i*2] != sys_ni_syscall) | |
646 | vdso_data->syscall_map_64[i >> 5] |= | |
647 | 0x80000000UL >> (i & 0x1f); | |
648 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
649 | vdso_data->syscall_map_32[i >> 5] |= | |
650 | 0x80000000UL >> (i & 0x1f); | |
651 | #else /* CONFIG_PPC64 */ | |
652 | if (sys_call_table[i] != sys_ni_syscall) | |
653 | vdso_data->syscall_map_32[i >> 5] |= | |
654 | 0x80000000UL >> (i & 0x1f); | |
655 | #endif /* CONFIG_PPC64 */ | |
656 | } | |
657 | } | |
658 | ||
659 | ||
660 | void __init vdso_init(void) | |
661 | { | |
662 | int i; | |
663 | ||
664 | #ifdef CONFIG_PPC64 | |
665 | /* | |
666 | * Fill up the "systemcfg" stuff for backward compatiblity | |
667 | */ | |
668 | strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); | |
669 | vdso_data->version.major = SYSTEMCFG_MAJOR; | |
670 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
671 | vdso_data->processor = mfspr(SPRN_PVR); | |
672 | vdso_data->platform = _machine; | |
673 | vdso_data->physicalMemorySize = lmb_phys_mem_size(); | |
674 | vdso_data->dcache_size = ppc64_caches.dsize; | |
675 | vdso_data->dcache_line_size = ppc64_caches.dline_size; | |
676 | vdso_data->icache_size = ppc64_caches.isize; | |
677 | vdso_data->icache_line_size = ppc64_caches.iline_size; | |
678 | ||
679 | /* | |
680 | * Calculate the size of the 64 bits vDSO | |
681 | */ | |
682 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
683 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
684 | #endif /* CONFIG_PPC64 */ | |
685 | ||
686 | ||
687 | /* | |
688 | * Calculate the size of the 32 bits vDSO | |
689 | */ | |
690 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
691 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
692 | ||
693 | ||
694 | /* | |
695 | * Setup the syscall map in the vDOS | |
696 | */ | |
697 | vdso_setup_syscall_map(); | |
698 | /* | |
699 | * Initialize the vDSO images in memory, that is do necessary | |
700 | * fixups of vDSO symbols, locate trampolines, etc... | |
701 | */ | |
702 | if (vdso_setup()) { | |
703 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
704 | vdso32_pages = 0; | |
705 | #ifdef CONFIG_PPC64 | |
706 | vdso64_pages = 0; | |
707 | #endif | |
708 | return; | |
709 | } | |
710 | ||
711 | /* Make sure pages are in the correct state */ | |
712 | for (i = 0; i < vdso32_pages; i++) { | |
713 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
714 | ClearPageReserved(pg); | |
715 | get_page(pg); | |
716 | ||
717 | } | |
718 | #ifdef CONFIG_PPC64 | |
719 | for (i = 0; i < vdso64_pages; i++) { | |
720 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
721 | ClearPageReserved(pg); | |
722 | get_page(pg); | |
723 | } | |
724 | #endif /* CONFIG_PPC64 */ | |
725 | ||
726 | get_page(virt_to_page(vdso_data)); | |
727 | } | |
728 | ||
729 | int in_gate_area_no_task(unsigned long addr) | |
730 | { | |
731 | return 0; | |
732 | } | |
733 | ||
734 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
735 | { | |
736 | return 0; | |
737 | } | |
738 | ||
739 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) | |
740 | { | |
741 | return NULL; | |
742 | } | |
743 |