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> | |
d9b2b2a2 | 24 | #include <linux/lmb.h> |
a7f290da BH |
25 | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/system.h> | |
28 | #include <asm/processor.h> | |
29 | #include <asm/mmu.h> | |
30 | #include <asm/mmu_context.h> | |
d9b2b2a2 | 31 | #include <asm/prom.h> |
a7f290da BH |
32 | #include <asm/machdep.h> |
33 | #include <asm/cputable.h> | |
34 | #include <asm/sections.h> | |
e8222502 | 35 | #include <asm/firmware.h> |
a7f290da BH |
36 | #include <asm/vdso.h> |
37 | #include <asm/vdso_datapage.h> | |
38 | ||
0909c8c2 BH |
39 | #include "setup.h" |
40 | ||
a7f290da BH |
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; | |
7ac9a137 BH |
54 | static unsigned int vdso32_pages; |
55 | static struct page **vdso32_pagelist; | |
a7f290da BH |
56 | unsigned long vdso32_sigtramp; |
57 | unsigned long vdso32_rt_sigtramp; | |
58 | ||
59 | #ifdef CONFIG_PPC64 | |
60 | extern char vdso64_start, vdso64_end; | |
61 | static void *vdso64_kbase = &vdso64_start; | |
7ac9a137 BH |
62 | static unsigned int vdso64_pages; |
63 | static struct page **vdso64_pagelist; | |
a7f290da BH |
64 | unsigned long vdso64_rt_sigtramp; |
65 | #endif /* CONFIG_PPC64 */ | |
66 | ||
7ac9a137 BH |
67 | static int vdso_ready; |
68 | ||
a7f290da BH |
69 | /* |
70 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
71 | * Once the early boot kernel code no longer needs to muck around | |
72 | * with it, it will become dynamically allocated | |
73 | */ | |
74 | static union { | |
75 | struct vdso_data data; | |
76 | u8 page[PAGE_SIZE]; | |
77 | } vdso_data_store __attribute__((__section__(".data.page_aligned"))); | |
78 | struct vdso_data *vdso_data = &vdso_data_store.data; | |
79 | ||
80 | /* Format of the patch table */ | |
81 | struct vdso_patch_def | |
82 | { | |
83 | unsigned long ftr_mask, ftr_value; | |
84 | const char *gen_name; | |
85 | const char *fix_name; | |
86 | }; | |
87 | ||
88 | /* Table of functions to patch based on the CPU type/revision | |
89 | * | |
90 | * Currently, we only change sync_dicache to do nothing on processors | |
91 | * with a coherent icache | |
92 | */ | |
93 | static struct vdso_patch_def vdso_patches[] = { | |
94 | { | |
95 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
96 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
97 | }, | |
98 | { | |
99 | CPU_FTR_USE_TB, 0, | |
100 | "__kernel_gettimeofday", NULL | |
101 | }, | |
7b5acbaa BH |
102 | { |
103 | CPU_FTR_USE_TB, 0, | |
104 | "__kernel_clock_gettime", NULL | |
105 | }, | |
106 | { | |
107 | CPU_FTR_USE_TB, 0, | |
108 | "__kernel_clock_getres", NULL | |
109 | }, | |
110 | { | |
111 | CPU_FTR_USE_TB, 0, | |
112 | "__kernel_get_tbfreq", NULL | |
113 | }, | |
a7f290da BH |
114 | }; |
115 | ||
116 | /* | |
117 | * Some infos carried around for each of them during parsing at | |
118 | * boot time. | |
119 | */ | |
120 | struct lib32_elfinfo | |
121 | { | |
122 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
123 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
124 | unsigned long dynsymsize; /* size of .dynsym section */ | |
125 | char *dynstr; /* ptr to .dynstr section */ | |
126 | unsigned long text; /* offset of .text section in .so */ | |
127 | }; | |
128 | ||
129 | struct lib64_elfinfo | |
130 | { | |
131 | Elf64_Ehdr *hdr; | |
132 | Elf64_Sym *dynsym; | |
133 | unsigned long dynsymsize; | |
134 | char *dynstr; | |
135 | unsigned long text; | |
136 | }; | |
137 | ||
138 | ||
139 | #ifdef __DEBUG | |
140 | static void dump_one_vdso_page(struct page *pg, struct page *upg) | |
141 | { | |
142 | printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), | |
143 | page_count(pg), | |
144 | pg->flags); | |
89f5b7da | 145 | if (upg && !IS_ERR(upg) /* && pg != upg*/) { |
a7f290da BH |
146 | printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) |
147 | << PAGE_SHIFT), | |
148 | page_count(upg), | |
149 | upg->flags); | |
150 | } | |
151 | printk("\n"); | |
152 | } | |
153 | ||
154 | static void dump_vdso_pages(struct vm_area_struct * vma) | |
155 | { | |
156 | int i; | |
157 | ||
158 | if (!vma || test_thread_flag(TIF_32BIT)) { | |
159 | printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); | |
160 | for (i=0; i<vdso32_pages; i++) { | |
161 | struct page *pg = virt_to_page(vdso32_kbase + | |
162 | i*PAGE_SIZE); | |
163 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 164 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
165 | : NULL; |
166 | dump_one_vdso_page(pg, upg); | |
167 | } | |
168 | } | |
169 | if (!vma || !test_thread_flag(TIF_32BIT)) { | |
170 | printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); | |
171 | for (i=0; i<vdso64_pages; i++) { | |
172 | struct page *pg = virt_to_page(vdso64_kbase + | |
173 | i*PAGE_SIZE); | |
174 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 175 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
176 | : NULL; |
177 | dump_one_vdso_page(pg, upg); | |
178 | } | |
179 | } | |
180 | } | |
181 | #endif /* DEBUG */ | |
182 | ||
a7f290da BH |
183 | /* |
184 | * This is called from binfmt_elf, we create the special vma for the | |
185 | * vDSO and insert it into the mm struct tree | |
186 | */ | |
187 | int arch_setup_additional_pages(struct linux_binprm *bprm, | |
188 | int executable_stack) | |
189 | { | |
190 | struct mm_struct *mm = current->mm; | |
c13e4ca2 | 191 | struct page **vdso_pagelist; |
a7f290da BH |
192 | unsigned long vdso_pages; |
193 | unsigned long vdso_base; | |
a5bba930 | 194 | int rc; |
a7f290da | 195 | |
7ac9a137 BH |
196 | if (!vdso_ready) |
197 | return 0; | |
198 | ||
a7f290da BH |
199 | #ifdef CONFIG_PPC64 |
200 | if (test_thread_flag(TIF_32BIT)) { | |
c13e4ca2 | 201 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
202 | vdso_pages = vdso32_pages; |
203 | vdso_base = VDSO32_MBASE; | |
204 | } else { | |
c13e4ca2 | 205 | vdso_pagelist = vdso64_pagelist; |
a7f290da BH |
206 | vdso_pages = vdso64_pages; |
207 | vdso_base = VDSO64_MBASE; | |
208 | } | |
209 | #else | |
c13e4ca2 | 210 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
211 | vdso_pages = vdso32_pages; |
212 | vdso_base = VDSO32_MBASE; | |
213 | #endif | |
214 | ||
a5bba930 | 215 | current->mm->context.vdso_base = 0; |
a7f290da BH |
216 | |
217 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
218 | * process | |
219 | */ | |
220 | if (vdso_pages == 0) | |
221 | return 0; | |
a7f290da BH |
222 | /* Add a page to the vdso size for the data page */ |
223 | vdso_pages ++; | |
224 | ||
225 | /* | |
226 | * pick a base address for the vDSO in process space. We try to put it | |
227 | * at vdso_base which is the "natural" base for it, but we might fail | |
228 | * and end up putting it elsewhere. | |
229 | */ | |
a5bba930 | 230 | down_write(&mm->mmap_sem); |
a7f290da BH |
231 | vdso_base = get_unmapped_area(NULL, vdso_base, |
232 | vdso_pages << PAGE_SHIFT, 0, 0); | |
a5bba930 BH |
233 | if (IS_ERR_VALUE(vdso_base)) { |
234 | rc = vdso_base; | |
235 | goto fail_mmapsem; | |
a7f290da BH |
236 | } |
237 | ||
a7f290da BH |
238 | /* |
239 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
240 | * allowed to write those pages. | |
241 | * gdb can break that with ptrace interface, and thus trigger COW on | |
242 | * those pages but it's then your responsibility to never do that on | |
243 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
244 | * and your nice userland gettimeofday will be totally dead. | |
245 | * It's fine to use that for setting breakpoints in the vDSO code | |
246 | * pages though | |
c13e4ca2 | 247 | * |
3a0cfadb RM |
248 | * Make sure the vDSO gets into every core dump. |
249 | * Dumping its contents makes post-mortem fully interpretable later | |
250 | * without matching up the same kernel and hardware config to see | |
251 | * what PC values meant. | |
252 | */ | |
c13e4ca2 RM |
253 | rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, |
254 | VM_READ|VM_EXEC| | |
255 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| | |
256 | VM_ALWAYSDUMP, | |
257 | vdso_pagelist); | |
a5bba930 | 258 | if (rc) |
c13e4ca2 | 259 | goto fail_mmapsem; |
a5bba930 | 260 | |
c13e4ca2 | 261 | /* Put vDSO base into mm struct */ |
a5bba930 | 262 | current->mm->context.vdso_base = vdso_base; |
c13e4ca2 | 263 | |
a7f290da | 264 | up_write(&mm->mmap_sem); |
a7f290da | 265 | return 0; |
a5bba930 | 266 | |
a5bba930 BH |
267 | fail_mmapsem: |
268 | up_write(&mm->mmap_sem); | |
269 | return rc; | |
270 | } | |
271 | ||
272 | const char *arch_vma_name(struct vm_area_struct *vma) | |
273 | { | |
274 | if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) | |
275 | return "[vdso]"; | |
276 | return NULL; | |
a7f290da BH |
277 | } |
278 | ||
a5bba930 BH |
279 | |
280 | ||
a7f290da BH |
281 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, |
282 | unsigned long *size) | |
283 | { | |
284 | Elf32_Shdr *sechdrs; | |
285 | unsigned int i; | |
286 | char *secnames; | |
287 | ||
288 | /* Grab section headers and strings so we can tell who is who */ | |
289 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
290 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
291 | ||
292 | /* Find the section they want */ | |
293 | for (i = 1; i < ehdr->e_shnum; i++) { | |
294 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
295 | if (size) | |
296 | *size = sechdrs[i].sh_size; | |
297 | return (void *)ehdr + sechdrs[i].sh_offset; | |
298 | } | |
299 | } | |
300 | *size = 0; | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
305 | const char *symname) | |
306 | { | |
307 | unsigned int i; | |
308 | char name[MAX_SYMNAME], *c; | |
309 | ||
310 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
311 | if (lib->dynsym[i].st_name == 0) | |
312 | continue; | |
313 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
314 | MAX_SYMNAME); | |
315 | c = strchr(name, '@'); | |
316 | if (c) | |
317 | *c = 0; | |
318 | if (strcmp(symname, name) == 0) | |
319 | return &lib->dynsym[i]; | |
320 | } | |
321 | return NULL; | |
322 | } | |
323 | ||
324 | /* Note that we assume the section is .text and the symbol is relative to | |
325 | * the library base | |
326 | */ | |
327 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
328 | const char *symname) | |
329 | { | |
330 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
331 | ||
332 | if (sym == NULL) { | |
333 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
334 | symname); | |
335 | return 0; | |
336 | } | |
337 | return sym->st_value - VDSO32_LBASE; | |
338 | } | |
339 | ||
cf8918fe AB |
340 | static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, |
341 | struct lib64_elfinfo *v64, | |
342 | const char *orig, const char *fix) | |
a7f290da BH |
343 | { |
344 | Elf32_Sym *sym32_gen, *sym32_fix; | |
345 | ||
346 | sym32_gen = find_symbol32(v32, orig); | |
347 | if (sym32_gen == NULL) { | |
348 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
349 | return -1; | |
350 | } | |
351 | if (fix == NULL) { | |
352 | sym32_gen->st_name = 0; | |
353 | return 0; | |
354 | } | |
355 | sym32_fix = find_symbol32(v32, fix); | |
356 | if (sym32_fix == NULL) { | |
357 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
358 | return -1; | |
359 | } | |
360 | sym32_gen->st_value = sym32_fix->st_value; | |
361 | sym32_gen->st_size = sym32_fix->st_size; | |
362 | sym32_gen->st_info = sym32_fix->st_info; | |
363 | sym32_gen->st_other = sym32_fix->st_other; | |
364 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | ||
370 | #ifdef CONFIG_PPC64 | |
371 | ||
372 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
373 | unsigned long *size) | |
374 | { | |
375 | Elf64_Shdr *sechdrs; | |
376 | unsigned int i; | |
377 | char *secnames; | |
378 | ||
379 | /* Grab section headers and strings so we can tell who is who */ | |
380 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
381 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
382 | ||
383 | /* Find the section they want */ | |
384 | for (i = 1; i < ehdr->e_shnum; i++) { | |
385 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
386 | if (size) | |
387 | *size = sechdrs[i].sh_size; | |
388 | return (void *)ehdr + sechdrs[i].sh_offset; | |
389 | } | |
390 | } | |
391 | if (size) | |
392 | *size = 0; | |
393 | return NULL; | |
394 | } | |
395 | ||
396 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
397 | const char *symname) | |
398 | { | |
399 | unsigned int i; | |
400 | char name[MAX_SYMNAME], *c; | |
401 | ||
402 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
403 | if (lib->dynsym[i].st_name == 0) | |
404 | continue; | |
405 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
406 | MAX_SYMNAME); | |
407 | c = strchr(name, '@'); | |
408 | if (c) | |
409 | *c = 0; | |
410 | if (strcmp(symname, name) == 0) | |
411 | return &lib->dynsym[i]; | |
412 | } | |
413 | return NULL; | |
414 | } | |
415 | ||
416 | /* Note that we assume the section is .text and the symbol is relative to | |
417 | * the library base | |
418 | */ | |
419 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
420 | const char *symname) | |
421 | { | |
422 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
423 | ||
424 | if (sym == NULL) { | |
425 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
426 | symname); | |
427 | return 0; | |
428 | } | |
429 | #ifdef VDS64_HAS_DESCRIPTORS | |
430 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
431 | VDSO64_LBASE; | |
432 | #else | |
433 | return sym->st_value - VDSO64_LBASE; | |
434 | #endif | |
435 | } | |
436 | ||
cf8918fe AB |
437 | static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, |
438 | struct lib64_elfinfo *v64, | |
439 | const char *orig, const char *fix) | |
a7f290da BH |
440 | { |
441 | Elf64_Sym *sym64_gen, *sym64_fix; | |
442 | ||
443 | sym64_gen = find_symbol64(v64, orig); | |
444 | if (sym64_gen == NULL) { | |
445 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
446 | return -1; | |
447 | } | |
448 | if (fix == NULL) { | |
449 | sym64_gen->st_name = 0; | |
450 | return 0; | |
451 | } | |
452 | sym64_fix = find_symbol64(v64, fix); | |
453 | if (sym64_fix == NULL) { | |
454 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
455 | return -1; | |
456 | } | |
457 | sym64_gen->st_value = sym64_fix->st_value; | |
458 | sym64_gen->st_size = sym64_fix->st_size; | |
459 | sym64_gen->st_info = sym64_fix->st_info; | |
460 | sym64_gen->st_other = sym64_fix->st_other; | |
461 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | #endif /* CONFIG_PPC64 */ | |
467 | ||
468 | ||
469 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
470 | struct lib64_elfinfo *v64) | |
471 | { | |
472 | void *sect; | |
473 | ||
474 | /* | |
475 | * Locate symbol tables & text section | |
476 | */ | |
477 | ||
478 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); | |
479 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
480 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
481 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
482 | return -1; | |
483 | } | |
484 | sect = find_section32(v32->hdr, ".text", NULL); | |
485 | if (sect == NULL) { | |
486 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
487 | return -1; | |
488 | } | |
489 | v32->text = sect - vdso32_kbase; | |
490 | ||
491 | #ifdef CONFIG_PPC64 | |
492 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
493 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
494 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
495 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
496 | return -1; | |
497 | } | |
498 | sect = find_section64(v64->hdr, ".text", NULL); | |
499 | if (sect == NULL) { | |
500 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
501 | return -1; | |
502 | } | |
503 | v64->text = sect - vdso64_kbase; | |
504 | #endif /* CONFIG_PPC64 */ | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
510 | struct lib64_elfinfo *v64) | |
511 | { | |
512 | /* | |
513 | * Find signal trampolines | |
514 | */ | |
515 | ||
516 | #ifdef CONFIG_PPC64 | |
517 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
518 | #endif | |
519 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
520 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
521 | } | |
522 | ||
523 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
524 | struct lib64_elfinfo *v64) | |
525 | { | |
526 | Elf32_Sym *sym32; | |
527 | #ifdef CONFIG_PPC64 | |
528 | Elf64_Sym *sym64; | |
529 | ||
530 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
531 | if (sym64 == NULL) { | |
532 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
533 | "__kernel_datapage_offset !\n"); | |
534 | return -1; | |
535 | } | |
536 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
537 | (vdso64_pages << PAGE_SHIFT) - | |
538 | (sym64->st_value - VDSO64_LBASE); | |
539 | #endif /* CONFIG_PPC64 */ | |
540 | ||
541 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); | |
542 | if (sym32 == NULL) { | |
543 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
544 | "__kernel_datapage_offset !\n"); | |
545 | return -1; | |
546 | } | |
547 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
548 | (vdso32_pages << PAGE_SHIFT) - | |
549 | (sym32->st_value - VDSO32_LBASE); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
0909c8c2 BH |
554 | |
555 | static __init int vdso_fixup_features(struct lib32_elfinfo *v32, | |
556 | struct lib64_elfinfo *v64) | |
557 | { | |
558 | void *start32; | |
559 | unsigned long size32; | |
560 | ||
561 | #ifdef CONFIG_PPC64 | |
562 | void *start64; | |
563 | unsigned long size64; | |
564 | ||
565 | start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); | |
566 | if (start64) | |
567 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
568 | start64, start64 + size64); | |
569 | ||
7c03d653 BH |
570 | start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64); |
571 | if (start64) | |
572 | do_feature_fixups(cur_cpu_spec->mmu_features, | |
573 | start64, start64 + size64); | |
574 | ||
0909c8c2 BH |
575 | start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); |
576 | if (start64) | |
577 | do_feature_fixups(powerpc_firmware_features, | |
578 | start64, start64 + size64); | |
2d1b2027 KG |
579 | |
580 | start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64); | |
581 | if (start64) | |
582 | do_lwsync_fixups(cur_cpu_spec->cpu_features, | |
583 | start64, start64 + size64); | |
0909c8c2 BH |
584 | #endif /* CONFIG_PPC64 */ |
585 | ||
586 | start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); | |
587 | if (start32) | |
588 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
589 | start32, start32 + size32); | |
590 | ||
7c03d653 BH |
591 | start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32); |
592 | if (start32) | |
593 | do_feature_fixups(cur_cpu_spec->mmu_features, | |
594 | start32, start32 + size32); | |
595 | ||
0909c8c2 BH |
596 | #ifdef CONFIG_PPC64 |
597 | start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); | |
598 | if (start32) | |
599 | do_feature_fixups(powerpc_firmware_features, | |
600 | start32, start32 + size32); | |
601 | #endif /* CONFIG_PPC64 */ | |
602 | ||
2d1b2027 KG |
603 | start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32); |
604 | if (start32) | |
605 | do_lwsync_fixups(cur_cpu_spec->cpu_features, | |
606 | start32, start32 + size32); | |
607 | ||
0909c8c2 BH |
608 | return 0; |
609 | } | |
610 | ||
a7f290da BH |
611 | static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, |
612 | struct lib64_elfinfo *v64) | |
613 | { | |
614 | int i; | |
615 | ||
616 | for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { | |
617 | struct vdso_patch_def *patch = &vdso_patches[i]; | |
618 | int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) | |
619 | == patch->ftr_value; | |
620 | if (!match) | |
621 | continue; | |
622 | ||
623 | DBG("replacing %s with %s...\n", patch->gen_name, | |
624 | patch->fix_name ? "NONE" : patch->fix_name); | |
625 | ||
626 | /* | |
627 | * Patch the 32 bits and 64 bits symbols. Note that we do not | |
628 | * patch the "." symbol on 64 bits. | |
629 | * It would be easy to do, but doesn't seem to be necessary, | |
630 | * patching the OPD symbol is enough. | |
631 | */ | |
632 | vdso_do_func_patch32(v32, v64, patch->gen_name, | |
633 | patch->fix_name); | |
634 | #ifdef CONFIG_PPC64 | |
635 | vdso_do_func_patch64(v32, v64, patch->gen_name, | |
636 | patch->fix_name); | |
637 | #endif /* CONFIG_PPC64 */ | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | ||
644 | static __init int vdso_setup(void) | |
645 | { | |
646 | struct lib32_elfinfo v32; | |
647 | struct lib64_elfinfo v64; | |
648 | ||
649 | v32.hdr = vdso32_kbase; | |
650 | #ifdef CONFIG_PPC64 | |
651 | v64.hdr = vdso64_kbase; | |
652 | #endif | |
653 | if (vdso_do_find_sections(&v32, &v64)) | |
654 | return -1; | |
655 | ||
656 | if (vdso_fixup_datapage(&v32, &v64)) | |
657 | return -1; | |
658 | ||
0909c8c2 BH |
659 | if (vdso_fixup_features(&v32, &v64)) |
660 | return -1; | |
661 | ||
a7f290da BH |
662 | if (vdso_fixup_alt_funcs(&v32, &v64)) |
663 | return -1; | |
664 | ||
665 | vdso_setup_trampolines(&v32, &v64); | |
666 | ||
667 | return 0; | |
668 | } | |
669 | ||
670 | /* | |
671 | * Called from setup_arch to initialize the bitmap of available | |
672 | * syscalls in the systemcfg page | |
673 | */ | |
674 | static void __init vdso_setup_syscall_map(void) | |
675 | { | |
676 | unsigned int i; | |
677 | extern unsigned long *sys_call_table; | |
678 | extern unsigned long sys_ni_syscall; | |
679 | ||
680 | ||
681 | for (i = 0; i < __NR_syscalls; i++) { | |
682 | #ifdef CONFIG_PPC64 | |
683 | if (sys_call_table[i*2] != sys_ni_syscall) | |
684 | vdso_data->syscall_map_64[i >> 5] |= | |
685 | 0x80000000UL >> (i & 0x1f); | |
686 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
687 | vdso_data->syscall_map_32[i >> 5] |= | |
688 | 0x80000000UL >> (i & 0x1f); | |
689 | #else /* CONFIG_PPC64 */ | |
690 | if (sys_call_table[i] != sys_ni_syscall) | |
691 | vdso_data->syscall_map_32[i >> 5] |= | |
692 | 0x80000000UL >> (i & 0x1f); | |
693 | #endif /* CONFIG_PPC64 */ | |
694 | } | |
695 | } | |
696 | ||
697 | ||
7ac9a137 | 698 | static int __init vdso_init(void) |
a7f290da BH |
699 | { |
700 | int i; | |
701 | ||
702 | #ifdef CONFIG_PPC64 | |
703 | /* | |
704 | * Fill up the "systemcfg" stuff for backward compatiblity | |
705 | */ | |
31fe5bf6 | 706 | strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); |
a7f290da BH |
707 | vdso_data->version.major = SYSTEMCFG_MAJOR; |
708 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
709 | vdso_data->processor = mfspr(SPRN_PVR); | |
e8222502 BH |
710 | /* |
711 | * Fake the old platform number for pSeries and iSeries and add | |
712 | * in LPAR bit if necessary | |
713 | */ | |
714 | vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100; | |
715 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
716 | vdso_data->platform |= 1; | |
a7f290da BH |
717 | vdso_data->physicalMemorySize = lmb_phys_mem_size(); |
718 | vdso_data->dcache_size = ppc64_caches.dsize; | |
719 | vdso_data->dcache_line_size = ppc64_caches.dline_size; | |
720 | vdso_data->icache_size = ppc64_caches.isize; | |
721 | vdso_data->icache_line_size = ppc64_caches.iline_size; | |
722 | ||
fbe48175 OJ |
723 | /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ |
724 | vdso_data->dcache_block_size = ppc64_caches.dline_size; | |
725 | vdso_data->icache_block_size = ppc64_caches.iline_size; | |
726 | vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; | |
727 | vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; | |
728 | ||
a7f290da BH |
729 | /* |
730 | * Calculate the size of the 64 bits vDSO | |
731 | */ | |
732 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
733 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
fbe48175 OJ |
734 | #else |
735 | vdso_data->dcache_block_size = L1_CACHE_BYTES; | |
736 | vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; | |
737 | vdso_data->icache_block_size = L1_CACHE_BYTES; | |
738 | vdso_data->icache_log_block_size = L1_CACHE_SHIFT; | |
a7f290da BH |
739 | #endif /* CONFIG_PPC64 */ |
740 | ||
741 | ||
742 | /* | |
743 | * Calculate the size of the 32 bits vDSO | |
744 | */ | |
745 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
746 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
747 | ||
748 | ||
749 | /* | |
750 | * Setup the syscall map in the vDOS | |
751 | */ | |
752 | vdso_setup_syscall_map(); | |
0909c8c2 | 753 | |
a7f290da BH |
754 | /* |
755 | * Initialize the vDSO images in memory, that is do necessary | |
756 | * fixups of vDSO symbols, locate trampolines, etc... | |
757 | */ | |
758 | if (vdso_setup()) { | |
759 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
760 | vdso32_pages = 0; | |
761 | #ifdef CONFIG_PPC64 | |
762 | vdso64_pages = 0; | |
763 | #endif | |
7ac9a137 | 764 | return 0; |
a7f290da BH |
765 | } |
766 | ||
767 | /* Make sure pages are in the correct state */ | |
7ac9a137 BH |
768 | vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), |
769 | GFP_KERNEL); | |
770 | BUG_ON(vdso32_pagelist == NULL); | |
a7f290da BH |
771 | for (i = 0; i < vdso32_pages; i++) { |
772 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
773 | ClearPageReserved(pg); | |
774 | get_page(pg); | |
c13e4ca2 | 775 | vdso32_pagelist[i] = pg; |
a7f290da | 776 | } |
c13e4ca2 RM |
777 | vdso32_pagelist[i++] = virt_to_page(vdso_data); |
778 | vdso32_pagelist[i] = NULL; | |
779 | ||
a7f290da | 780 | #ifdef CONFIG_PPC64 |
7ac9a137 BH |
781 | vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), |
782 | GFP_KERNEL); | |
783 | BUG_ON(vdso64_pagelist == NULL); | |
a7f290da BH |
784 | for (i = 0; i < vdso64_pages; i++) { |
785 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
786 | ClearPageReserved(pg); | |
787 | get_page(pg); | |
c13e4ca2 | 788 | vdso64_pagelist[i] = pg; |
a7f290da | 789 | } |
c13e4ca2 RM |
790 | vdso64_pagelist[i++] = virt_to_page(vdso_data); |
791 | vdso64_pagelist[i] = NULL; | |
a7f290da BH |
792 | #endif /* CONFIG_PPC64 */ |
793 | ||
794 | get_page(virt_to_page(vdso_data)); | |
7ac9a137 BH |
795 | |
796 | smp_wmb(); | |
797 | vdso_ready = 1; | |
798 | ||
799 | return 0; | |
a7f290da | 800 | } |
7ac9a137 | 801 | arch_initcall(vdso_init); |
a7f290da BH |
802 | |
803 | int in_gate_area_no_task(unsigned long addr) | |
804 | { | |
805 | return 0; | |
806 | } | |
807 | ||
808 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
809 | { | |
810 | return 0; | |
811 | } | |
812 | ||
813 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) | |
814 | { | |
815 | return NULL; | |
816 | } | |
817 |