Commit | Line | Data |
---|---|---|
a7f290da | 1 | /* |
a7f290da BH |
2 | * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. |
3 | * <benh@kernel.crashing.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | */ | |
10 | ||
a7f290da BH |
11 | #include <linux/module.h> |
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> | |
a7f290da BH |
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 | ||
25 | #include <asm/pgtable.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/processor.h> | |
28 | #include <asm/mmu.h> | |
29 | #include <asm/mmu_context.h> | |
30 | #include <asm/lmb.h> | |
31 | #include <asm/machdep.h> | |
32 | #include <asm/cputable.h> | |
33 | #include <asm/sections.h> | |
e8222502 | 34 | #include <asm/firmware.h> |
a7f290da BH |
35 | #include <asm/vdso.h> |
36 | #include <asm/vdso_datapage.h> | |
37 | ||
0909c8c2 BH |
38 | #include "setup.h" |
39 | ||
a7f290da BH |
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 | extern char vdso32_start, vdso32_end; | |
52 | static void *vdso32_kbase = &vdso32_start; | |
7ac9a137 BH |
53 | static unsigned int vdso32_pages; |
54 | static struct page **vdso32_pagelist; | |
a7f290da BH |
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; | |
7ac9a137 BH |
61 | static unsigned int vdso64_pages; |
62 | static struct page **vdso64_pagelist; | |
a7f290da BH |
63 | unsigned long vdso64_rt_sigtramp; |
64 | #endif /* CONFIG_PPC64 */ | |
65 | ||
7ac9a137 BH |
66 | static int vdso_ready; |
67 | ||
a7f290da BH |
68 | /* |
69 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
70 | * Once the early boot kernel code no longer needs to muck around | |
71 | * with it, it will become dynamically allocated | |
72 | */ | |
73 | static union { | |
74 | struct vdso_data data; | |
75 | u8 page[PAGE_SIZE]; | |
76 | } vdso_data_store __attribute__((__section__(".data.page_aligned"))); | |
77 | struct vdso_data *vdso_data = &vdso_data_store.data; | |
78 | ||
79 | /* Format of the patch table */ | |
80 | struct vdso_patch_def | |
81 | { | |
82 | unsigned long ftr_mask, ftr_value; | |
83 | const char *gen_name; | |
84 | const char *fix_name; | |
85 | }; | |
86 | ||
87 | /* Table of functions to patch based on the CPU type/revision | |
88 | * | |
89 | * Currently, we only change sync_dicache to do nothing on processors | |
90 | * with a coherent icache | |
91 | */ | |
92 | static struct vdso_patch_def vdso_patches[] = { | |
93 | { | |
94 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
95 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
96 | }, | |
97 | { | |
98 | CPU_FTR_USE_TB, 0, | |
99 | "__kernel_gettimeofday", NULL | |
100 | }, | |
7b5acbaa BH |
101 | { |
102 | CPU_FTR_USE_TB, 0, | |
103 | "__kernel_clock_gettime", NULL | |
104 | }, | |
105 | { | |
106 | CPU_FTR_USE_TB, 0, | |
107 | "__kernel_clock_getres", NULL | |
108 | }, | |
109 | { | |
110 | CPU_FTR_USE_TB, 0, | |
111 | "__kernel_get_tbfreq", NULL | |
112 | }, | |
a7f290da BH |
113 | }; |
114 | ||
115 | /* | |
116 | * Some infos carried around for each of them during parsing at | |
117 | * boot time. | |
118 | */ | |
119 | struct lib32_elfinfo | |
120 | { | |
121 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
122 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
123 | unsigned long dynsymsize; /* size of .dynsym section */ | |
124 | char *dynstr; /* ptr to .dynstr section */ | |
125 | unsigned long text; /* offset of .text section in .so */ | |
126 | }; | |
127 | ||
128 | struct lib64_elfinfo | |
129 | { | |
130 | Elf64_Ehdr *hdr; | |
131 | Elf64_Sym *dynsym; | |
132 | unsigned long dynsymsize; | |
133 | char *dynstr; | |
134 | unsigned long text; | |
135 | }; | |
136 | ||
137 | ||
138 | #ifdef __DEBUG | |
139 | static void dump_one_vdso_page(struct page *pg, struct page *upg) | |
140 | { | |
141 | printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), | |
142 | page_count(pg), | |
143 | pg->flags); | |
144 | if (upg/* && pg != upg*/) { | |
145 | printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) | |
146 | << PAGE_SHIFT), | |
147 | page_count(upg), | |
148 | upg->flags); | |
149 | } | |
150 | printk("\n"); | |
151 | } | |
152 | ||
153 | static void dump_vdso_pages(struct vm_area_struct * vma) | |
154 | { | |
155 | int i; | |
156 | ||
157 | if (!vma || test_thread_flag(TIF_32BIT)) { | |
158 | printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); | |
159 | for (i=0; i<vdso32_pages; i++) { | |
160 | struct page *pg = virt_to_page(vdso32_kbase + | |
161 | i*PAGE_SIZE); | |
162 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 163 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
164 | : NULL; |
165 | dump_one_vdso_page(pg, upg); | |
166 | } | |
167 | } | |
168 | if (!vma || !test_thread_flag(TIF_32BIT)) { | |
169 | printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); | |
170 | for (i=0; i<vdso64_pages; i++) { | |
171 | struct page *pg = virt_to_page(vdso64_kbase + | |
172 | i*PAGE_SIZE); | |
173 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 174 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
175 | : NULL; |
176 | dump_one_vdso_page(pg, upg); | |
177 | } | |
178 | } | |
179 | } | |
180 | #endif /* DEBUG */ | |
181 | ||
a7f290da BH |
182 | /* |
183 | * This is called from binfmt_elf, we create the special vma for the | |
184 | * vDSO and insert it into the mm struct tree | |
185 | */ | |
186 | int arch_setup_additional_pages(struct linux_binprm *bprm, | |
187 | int executable_stack) | |
188 | { | |
189 | struct mm_struct *mm = current->mm; | |
c13e4ca2 | 190 | struct page **vdso_pagelist; |
a7f290da BH |
191 | unsigned long vdso_pages; |
192 | unsigned long vdso_base; | |
a5bba930 | 193 | int rc; |
a7f290da | 194 | |
7ac9a137 BH |
195 | if (!vdso_ready) |
196 | return 0; | |
197 | ||
a7f290da BH |
198 | #ifdef CONFIG_PPC64 |
199 | if (test_thread_flag(TIF_32BIT)) { | |
c13e4ca2 | 200 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
201 | vdso_pages = vdso32_pages; |
202 | vdso_base = VDSO32_MBASE; | |
203 | } else { | |
c13e4ca2 | 204 | vdso_pagelist = vdso64_pagelist; |
a7f290da BH |
205 | vdso_pages = vdso64_pages; |
206 | vdso_base = VDSO64_MBASE; | |
207 | } | |
208 | #else | |
c13e4ca2 | 209 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
210 | vdso_pages = vdso32_pages; |
211 | vdso_base = VDSO32_MBASE; | |
212 | #endif | |
213 | ||
a5bba930 | 214 | current->mm->context.vdso_base = 0; |
a7f290da BH |
215 | |
216 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
217 | * process | |
218 | */ | |
219 | if (vdso_pages == 0) | |
220 | return 0; | |
a7f290da BH |
221 | /* Add a page to the vdso size for the data page */ |
222 | vdso_pages ++; | |
223 | ||
224 | /* | |
225 | * pick a base address for the vDSO in process space. We try to put it | |
226 | * at vdso_base which is the "natural" base for it, but we might fail | |
227 | * and end up putting it elsewhere. | |
228 | */ | |
a5bba930 | 229 | down_write(&mm->mmap_sem); |
a7f290da BH |
230 | vdso_base = get_unmapped_area(NULL, vdso_base, |
231 | vdso_pages << PAGE_SHIFT, 0, 0); | |
a5bba930 BH |
232 | if (IS_ERR_VALUE(vdso_base)) { |
233 | rc = vdso_base; | |
234 | goto fail_mmapsem; | |
a7f290da BH |
235 | } |
236 | ||
a7f290da BH |
237 | /* |
238 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
239 | * allowed to write those pages. | |
240 | * gdb can break that with ptrace interface, and thus trigger COW on | |
241 | * those pages but it's then your responsibility to never do that on | |
242 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
243 | * and your nice userland gettimeofday will be totally dead. | |
244 | * It's fine to use that for setting breakpoints in the vDSO code | |
245 | * pages though | |
c13e4ca2 | 246 | * |
3a0cfadb RM |
247 | * Make sure the vDSO gets into every core dump. |
248 | * Dumping its contents makes post-mortem fully interpretable later | |
249 | * without matching up the same kernel and hardware config to see | |
250 | * what PC values meant. | |
251 | */ | |
c13e4ca2 RM |
252 | rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, |
253 | VM_READ|VM_EXEC| | |
254 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| | |
255 | VM_ALWAYSDUMP, | |
256 | vdso_pagelist); | |
a5bba930 | 257 | if (rc) |
c13e4ca2 | 258 | goto fail_mmapsem; |
a5bba930 | 259 | |
c13e4ca2 | 260 | /* Put vDSO base into mm struct */ |
a5bba930 | 261 | current->mm->context.vdso_base = vdso_base; |
c13e4ca2 | 262 | |
a7f290da | 263 | up_write(&mm->mmap_sem); |
a7f290da | 264 | return 0; |
a5bba930 | 265 | |
a5bba930 BH |
266 | fail_mmapsem: |
267 | up_write(&mm->mmap_sem); | |
268 | return rc; | |
269 | } | |
270 | ||
271 | const char *arch_vma_name(struct vm_area_struct *vma) | |
272 | { | |
273 | if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) | |
274 | return "[vdso]"; | |
275 | return NULL; | |
a7f290da BH |
276 | } |
277 | ||
a5bba930 BH |
278 | |
279 | ||
a7f290da BH |
280 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, |
281 | unsigned long *size) | |
282 | { | |
283 | Elf32_Shdr *sechdrs; | |
284 | unsigned int i; | |
285 | char *secnames; | |
286 | ||
287 | /* Grab section headers and strings so we can tell who is who */ | |
288 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
289 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
290 | ||
291 | /* Find the section they want */ | |
292 | for (i = 1; i < ehdr->e_shnum; i++) { | |
293 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
294 | if (size) | |
295 | *size = sechdrs[i].sh_size; | |
296 | return (void *)ehdr + sechdrs[i].sh_offset; | |
297 | } | |
298 | } | |
299 | *size = 0; | |
300 | return NULL; | |
301 | } | |
302 | ||
303 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
304 | const char *symname) | |
305 | { | |
306 | unsigned int i; | |
307 | char name[MAX_SYMNAME], *c; | |
308 | ||
309 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
310 | if (lib->dynsym[i].st_name == 0) | |
311 | continue; | |
312 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
313 | MAX_SYMNAME); | |
314 | c = strchr(name, '@'); | |
315 | if (c) | |
316 | *c = 0; | |
317 | if (strcmp(symname, name) == 0) | |
318 | return &lib->dynsym[i]; | |
319 | } | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | /* Note that we assume the section is .text and the symbol is relative to | |
324 | * the library base | |
325 | */ | |
326 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
327 | const char *symname) | |
328 | { | |
329 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
330 | ||
331 | if (sym == NULL) { | |
332 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
333 | symname); | |
334 | return 0; | |
335 | } | |
336 | return sym->st_value - VDSO32_LBASE; | |
337 | } | |
338 | ||
339 | static int vdso_do_func_patch32(struct lib32_elfinfo *v32, | |
340 | struct lib64_elfinfo *v64, | |
341 | const char *orig, const char *fix) | |
342 | { | |
343 | Elf32_Sym *sym32_gen, *sym32_fix; | |
344 | ||
345 | sym32_gen = find_symbol32(v32, orig); | |
346 | if (sym32_gen == NULL) { | |
347 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
348 | return -1; | |
349 | } | |
350 | if (fix == NULL) { | |
351 | sym32_gen->st_name = 0; | |
352 | return 0; | |
353 | } | |
354 | sym32_fix = find_symbol32(v32, fix); | |
355 | if (sym32_fix == NULL) { | |
356 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
357 | return -1; | |
358 | } | |
359 | sym32_gen->st_value = sym32_fix->st_value; | |
360 | sym32_gen->st_size = sym32_fix->st_size; | |
361 | sym32_gen->st_info = sym32_fix->st_info; | |
362 | sym32_gen->st_other = sym32_fix->st_other; | |
363 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | ||
369 | #ifdef CONFIG_PPC64 | |
370 | ||
371 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
372 | unsigned long *size) | |
373 | { | |
374 | Elf64_Shdr *sechdrs; | |
375 | unsigned int i; | |
376 | char *secnames; | |
377 | ||
378 | /* Grab section headers and strings so we can tell who is who */ | |
379 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
380 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
381 | ||
382 | /* Find the section they want */ | |
383 | for (i = 1; i < ehdr->e_shnum; i++) { | |
384 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
385 | if (size) | |
386 | *size = sechdrs[i].sh_size; | |
387 | return (void *)ehdr + sechdrs[i].sh_offset; | |
388 | } | |
389 | } | |
390 | if (size) | |
391 | *size = 0; | |
392 | return NULL; | |
393 | } | |
394 | ||
395 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
396 | const char *symname) | |
397 | { | |
398 | unsigned int i; | |
399 | char name[MAX_SYMNAME], *c; | |
400 | ||
401 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
402 | if (lib->dynsym[i].st_name == 0) | |
403 | continue; | |
404 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
405 | MAX_SYMNAME); | |
406 | c = strchr(name, '@'); | |
407 | if (c) | |
408 | *c = 0; | |
409 | if (strcmp(symname, name) == 0) | |
410 | return &lib->dynsym[i]; | |
411 | } | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | /* Note that we assume the section is .text and the symbol is relative to | |
416 | * the library base | |
417 | */ | |
418 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
419 | const char *symname) | |
420 | { | |
421 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
422 | ||
423 | if (sym == NULL) { | |
424 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
425 | symname); | |
426 | return 0; | |
427 | } | |
428 | #ifdef VDS64_HAS_DESCRIPTORS | |
429 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
430 | VDSO64_LBASE; | |
431 | #else | |
432 | return sym->st_value - VDSO64_LBASE; | |
433 | #endif | |
434 | } | |
435 | ||
436 | static int vdso_do_func_patch64(struct lib32_elfinfo *v32, | |
437 | struct lib64_elfinfo *v64, | |
438 | const char *orig, const char *fix) | |
439 | { | |
440 | Elf64_Sym *sym64_gen, *sym64_fix; | |
441 | ||
442 | sym64_gen = find_symbol64(v64, orig); | |
443 | if (sym64_gen == NULL) { | |
444 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
445 | return -1; | |
446 | } | |
447 | if (fix == NULL) { | |
448 | sym64_gen->st_name = 0; | |
449 | return 0; | |
450 | } | |
451 | sym64_fix = find_symbol64(v64, fix); | |
452 | if (sym64_fix == NULL) { | |
453 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
454 | return -1; | |
455 | } | |
456 | sym64_gen->st_value = sym64_fix->st_value; | |
457 | sym64_gen->st_size = sym64_fix->st_size; | |
458 | sym64_gen->st_info = sym64_fix->st_info; | |
459 | sym64_gen->st_other = sym64_fix->st_other; | |
460 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | #endif /* CONFIG_PPC64 */ | |
466 | ||
467 | ||
468 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
469 | struct lib64_elfinfo *v64) | |
470 | { | |
471 | void *sect; | |
472 | ||
473 | /* | |
474 | * Locate symbol tables & text section | |
475 | */ | |
476 | ||
477 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); | |
478 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
479 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
480 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
481 | return -1; | |
482 | } | |
483 | sect = find_section32(v32->hdr, ".text", NULL); | |
484 | if (sect == NULL) { | |
485 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
486 | return -1; | |
487 | } | |
488 | v32->text = sect - vdso32_kbase; | |
489 | ||
490 | #ifdef CONFIG_PPC64 | |
491 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
492 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
493 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
494 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
495 | return -1; | |
496 | } | |
497 | sect = find_section64(v64->hdr, ".text", NULL); | |
498 | if (sect == NULL) { | |
499 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
500 | return -1; | |
501 | } | |
502 | v64->text = sect - vdso64_kbase; | |
503 | #endif /* CONFIG_PPC64 */ | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
509 | struct lib64_elfinfo *v64) | |
510 | { | |
511 | /* | |
512 | * Find signal trampolines | |
513 | */ | |
514 | ||
515 | #ifdef CONFIG_PPC64 | |
516 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
517 | #endif | |
518 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
519 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
520 | } | |
521 | ||
522 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
523 | struct lib64_elfinfo *v64) | |
524 | { | |
525 | Elf32_Sym *sym32; | |
526 | #ifdef CONFIG_PPC64 | |
527 | Elf64_Sym *sym64; | |
528 | ||
529 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
530 | if (sym64 == NULL) { | |
531 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
532 | "__kernel_datapage_offset !\n"); | |
533 | return -1; | |
534 | } | |
535 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
536 | (vdso64_pages << PAGE_SHIFT) - | |
537 | (sym64->st_value - VDSO64_LBASE); | |
538 | #endif /* CONFIG_PPC64 */ | |
539 | ||
540 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); | |
541 | if (sym32 == NULL) { | |
542 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
543 | "__kernel_datapage_offset !\n"); | |
544 | return -1; | |
545 | } | |
546 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
547 | (vdso32_pages << PAGE_SHIFT) - | |
548 | (sym32->st_value - VDSO32_LBASE); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
0909c8c2 BH |
553 | |
554 | static __init int vdso_fixup_features(struct lib32_elfinfo *v32, | |
555 | struct lib64_elfinfo *v64) | |
556 | { | |
557 | void *start32; | |
558 | unsigned long size32; | |
559 | ||
560 | #ifdef CONFIG_PPC64 | |
561 | void *start64; | |
562 | unsigned long size64; | |
563 | ||
564 | start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); | |
565 | if (start64) | |
566 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
567 | start64, start64 + size64); | |
568 | ||
569 | start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); | |
570 | if (start64) | |
571 | do_feature_fixups(powerpc_firmware_features, | |
572 | start64, start64 + size64); | |
573 | #endif /* CONFIG_PPC64 */ | |
574 | ||
575 | start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); | |
576 | if (start32) | |
577 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
578 | start32, start32 + size32); | |
579 | ||
580 | #ifdef CONFIG_PPC64 | |
581 | start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); | |
582 | if (start32) | |
583 | do_feature_fixups(powerpc_firmware_features, | |
584 | start32, start32 + size32); | |
585 | #endif /* CONFIG_PPC64 */ | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
a7f290da BH |
590 | static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, |
591 | struct lib64_elfinfo *v64) | |
592 | { | |
593 | int i; | |
594 | ||
595 | for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { | |
596 | struct vdso_patch_def *patch = &vdso_patches[i]; | |
597 | int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) | |
598 | == patch->ftr_value; | |
599 | if (!match) | |
600 | continue; | |
601 | ||
602 | DBG("replacing %s with %s...\n", patch->gen_name, | |
603 | patch->fix_name ? "NONE" : patch->fix_name); | |
604 | ||
605 | /* | |
606 | * Patch the 32 bits and 64 bits symbols. Note that we do not | |
607 | * patch the "." symbol on 64 bits. | |
608 | * It would be easy to do, but doesn't seem to be necessary, | |
609 | * patching the OPD symbol is enough. | |
610 | */ | |
611 | vdso_do_func_patch32(v32, v64, patch->gen_name, | |
612 | patch->fix_name); | |
613 | #ifdef CONFIG_PPC64 | |
614 | vdso_do_func_patch64(v32, v64, patch->gen_name, | |
615 | patch->fix_name); | |
616 | #endif /* CONFIG_PPC64 */ | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | ||
623 | static __init int vdso_setup(void) | |
624 | { | |
625 | struct lib32_elfinfo v32; | |
626 | struct lib64_elfinfo v64; | |
627 | ||
628 | v32.hdr = vdso32_kbase; | |
629 | #ifdef CONFIG_PPC64 | |
630 | v64.hdr = vdso64_kbase; | |
631 | #endif | |
632 | if (vdso_do_find_sections(&v32, &v64)) | |
633 | return -1; | |
634 | ||
635 | if (vdso_fixup_datapage(&v32, &v64)) | |
636 | return -1; | |
637 | ||
0909c8c2 BH |
638 | if (vdso_fixup_features(&v32, &v64)) |
639 | return -1; | |
640 | ||
a7f290da BH |
641 | if (vdso_fixup_alt_funcs(&v32, &v64)) |
642 | return -1; | |
643 | ||
644 | vdso_setup_trampolines(&v32, &v64); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Called from setup_arch to initialize the bitmap of available | |
651 | * syscalls in the systemcfg page | |
652 | */ | |
653 | static void __init vdso_setup_syscall_map(void) | |
654 | { | |
655 | unsigned int i; | |
656 | extern unsigned long *sys_call_table; | |
657 | extern unsigned long sys_ni_syscall; | |
658 | ||
659 | ||
660 | for (i = 0; i < __NR_syscalls; i++) { | |
661 | #ifdef CONFIG_PPC64 | |
662 | if (sys_call_table[i*2] != sys_ni_syscall) | |
663 | vdso_data->syscall_map_64[i >> 5] |= | |
664 | 0x80000000UL >> (i & 0x1f); | |
665 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
666 | vdso_data->syscall_map_32[i >> 5] |= | |
667 | 0x80000000UL >> (i & 0x1f); | |
668 | #else /* CONFIG_PPC64 */ | |
669 | if (sys_call_table[i] != sys_ni_syscall) | |
670 | vdso_data->syscall_map_32[i >> 5] |= | |
671 | 0x80000000UL >> (i & 0x1f); | |
672 | #endif /* CONFIG_PPC64 */ | |
673 | } | |
674 | } | |
675 | ||
676 | ||
7ac9a137 | 677 | static int __init vdso_init(void) |
a7f290da BH |
678 | { |
679 | int i; | |
680 | ||
681 | #ifdef CONFIG_PPC64 | |
682 | /* | |
683 | * Fill up the "systemcfg" stuff for backward compatiblity | |
684 | */ | |
31fe5bf6 | 685 | strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); |
a7f290da BH |
686 | vdso_data->version.major = SYSTEMCFG_MAJOR; |
687 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
688 | vdso_data->processor = mfspr(SPRN_PVR); | |
e8222502 BH |
689 | /* |
690 | * Fake the old platform number for pSeries and iSeries and add | |
691 | * in LPAR bit if necessary | |
692 | */ | |
693 | vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100; | |
694 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
695 | vdso_data->platform |= 1; | |
a7f290da BH |
696 | vdso_data->physicalMemorySize = lmb_phys_mem_size(); |
697 | vdso_data->dcache_size = ppc64_caches.dsize; | |
698 | vdso_data->dcache_line_size = ppc64_caches.dline_size; | |
699 | vdso_data->icache_size = ppc64_caches.isize; | |
700 | vdso_data->icache_line_size = ppc64_caches.iline_size; | |
701 | ||
702 | /* | |
703 | * Calculate the size of the 64 bits vDSO | |
704 | */ | |
705 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
706 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
707 | #endif /* CONFIG_PPC64 */ | |
708 | ||
709 | ||
710 | /* | |
711 | * Calculate the size of the 32 bits vDSO | |
712 | */ | |
713 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
714 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
715 | ||
716 | ||
717 | /* | |
718 | * Setup the syscall map in the vDOS | |
719 | */ | |
720 | vdso_setup_syscall_map(); | |
0909c8c2 | 721 | |
a7f290da BH |
722 | /* |
723 | * Initialize the vDSO images in memory, that is do necessary | |
724 | * fixups of vDSO symbols, locate trampolines, etc... | |
725 | */ | |
726 | if (vdso_setup()) { | |
727 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
728 | vdso32_pages = 0; | |
729 | #ifdef CONFIG_PPC64 | |
730 | vdso64_pages = 0; | |
731 | #endif | |
7ac9a137 | 732 | return 0; |
a7f290da BH |
733 | } |
734 | ||
735 | /* Make sure pages are in the correct state */ | |
7ac9a137 BH |
736 | vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), |
737 | GFP_KERNEL); | |
738 | BUG_ON(vdso32_pagelist == NULL); | |
a7f290da BH |
739 | for (i = 0; i < vdso32_pages; i++) { |
740 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
741 | ClearPageReserved(pg); | |
742 | get_page(pg); | |
c13e4ca2 | 743 | vdso32_pagelist[i] = pg; |
a7f290da | 744 | } |
c13e4ca2 RM |
745 | vdso32_pagelist[i++] = virt_to_page(vdso_data); |
746 | vdso32_pagelist[i] = NULL; | |
747 | ||
a7f290da | 748 | #ifdef CONFIG_PPC64 |
7ac9a137 BH |
749 | vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), |
750 | GFP_KERNEL); | |
751 | BUG_ON(vdso64_pagelist == NULL); | |
a7f290da BH |
752 | for (i = 0; i < vdso64_pages; i++) { |
753 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
754 | ClearPageReserved(pg); | |
755 | get_page(pg); | |
c13e4ca2 | 756 | vdso64_pagelist[i] = pg; |
a7f290da | 757 | } |
c13e4ca2 RM |
758 | vdso64_pagelist[i++] = virt_to_page(vdso_data); |
759 | vdso64_pagelist[i] = NULL; | |
a7f290da BH |
760 | #endif /* CONFIG_PPC64 */ |
761 | ||
762 | get_page(virt_to_page(vdso_data)); | |
7ac9a137 BH |
763 | |
764 | smp_wmb(); | |
765 | vdso_ready = 1; | |
766 | ||
767 | return 0; | |
a7f290da | 768 | } |
dc9b43d0 | 769 | #ifdef CONFIG_PPC_MERGE |
7ac9a137 | 770 | arch_initcall(vdso_init); |
dc9b43d0 | 771 | #endif |
a7f290da BH |
772 | |
773 | int in_gate_area_no_task(unsigned long addr) | |
774 | { | |
775 | return 0; | |
776 | } | |
777 | ||
778 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
779 | { | |
780 | return 0; | |
781 | } | |
782 | ||
783 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) | |
784 | { | |
785 | return NULL; | |
786 | } | |
787 |