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