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> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/stddef.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/user.h> | |
22 | #include <linux/elf.h> | |
23 | #include <linux/security.h> | |
24 | #include <linux/bootmem.h> | |
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> | |
31 | #include <asm/lmb.h> | |
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 | ||
c13e4ca2 RM |
52 | #define VDSO32_MAXPAGES (((0x3000 + PAGE_MASK) >> PAGE_SHIFT) + 2) |
53 | #define VDSO64_MAXPAGES (((0x3000 + PAGE_MASK) >> PAGE_SHIFT) + 2) | |
54 | ||
a7f290da BH |
55 | extern char vdso32_start, vdso32_end; |
56 | static void *vdso32_kbase = &vdso32_start; | |
57 | unsigned int vdso32_pages; | |
c13e4ca2 | 58 | static struct page *vdso32_pagelist[VDSO32_MAXPAGES]; |
a7f290da BH |
59 | unsigned long vdso32_sigtramp; |
60 | unsigned long vdso32_rt_sigtramp; | |
61 | ||
62 | #ifdef CONFIG_PPC64 | |
63 | extern char vdso64_start, vdso64_end; | |
64 | static void *vdso64_kbase = &vdso64_start; | |
65 | unsigned int vdso64_pages; | |
c13e4ca2 | 66 | static struct page *vdso64_pagelist[VDSO64_MAXPAGES]; |
a7f290da BH |
67 | unsigned long vdso64_rt_sigtramp; |
68 | #endif /* CONFIG_PPC64 */ | |
69 | ||
70 | /* | |
71 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
72 | * Once the early boot kernel code no longer needs to muck around | |
73 | * with it, it will become dynamically allocated | |
74 | */ | |
75 | static union { | |
76 | struct vdso_data data; | |
77 | u8 page[PAGE_SIZE]; | |
78 | } vdso_data_store __attribute__((__section__(".data.page_aligned"))); | |
79 | struct vdso_data *vdso_data = &vdso_data_store.data; | |
80 | ||
81 | /* Format of the patch table */ | |
82 | struct vdso_patch_def | |
83 | { | |
84 | unsigned long ftr_mask, ftr_value; | |
85 | const char *gen_name; | |
86 | const char *fix_name; | |
87 | }; | |
88 | ||
89 | /* Table of functions to patch based on the CPU type/revision | |
90 | * | |
91 | * Currently, we only change sync_dicache to do nothing on processors | |
92 | * with a coherent icache | |
93 | */ | |
94 | static struct vdso_patch_def vdso_patches[] = { | |
95 | { | |
96 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
97 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
98 | }, | |
99 | { | |
100 | CPU_FTR_USE_TB, 0, | |
101 | "__kernel_gettimeofday", NULL | |
102 | }, | |
103 | }; | |
104 | ||
105 | /* | |
106 | * Some infos carried around for each of them during parsing at | |
107 | * boot time. | |
108 | */ | |
109 | struct lib32_elfinfo | |
110 | { | |
111 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
112 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
113 | unsigned long dynsymsize; /* size of .dynsym section */ | |
114 | char *dynstr; /* ptr to .dynstr section */ | |
115 | unsigned long text; /* offset of .text section in .so */ | |
116 | }; | |
117 | ||
118 | struct lib64_elfinfo | |
119 | { | |
120 | Elf64_Ehdr *hdr; | |
121 | Elf64_Sym *dynsym; | |
122 | unsigned long dynsymsize; | |
123 | char *dynstr; | |
124 | unsigned long text; | |
125 | }; | |
126 | ||
127 | ||
128 | #ifdef __DEBUG | |
129 | static void dump_one_vdso_page(struct page *pg, struct page *upg) | |
130 | { | |
131 | printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), | |
132 | page_count(pg), | |
133 | pg->flags); | |
134 | if (upg/* && pg != upg*/) { | |
135 | printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) | |
136 | << PAGE_SHIFT), | |
137 | page_count(upg), | |
138 | upg->flags); | |
139 | } | |
140 | printk("\n"); | |
141 | } | |
142 | ||
143 | static void dump_vdso_pages(struct vm_area_struct * vma) | |
144 | { | |
145 | int i; | |
146 | ||
147 | if (!vma || test_thread_flag(TIF_32BIT)) { | |
148 | printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); | |
149 | for (i=0; i<vdso32_pages; i++) { | |
150 | struct page *pg = virt_to_page(vdso32_kbase + | |
151 | i*PAGE_SIZE); | |
152 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 153 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
154 | : NULL; |
155 | dump_one_vdso_page(pg, upg); | |
156 | } | |
157 | } | |
158 | if (!vma || !test_thread_flag(TIF_32BIT)) { | |
159 | printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); | |
160 | for (i=0; i<vdso64_pages; i++) { | |
161 | struct page *pg = virt_to_page(vdso64_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 | } | |
170 | #endif /* DEBUG */ | |
171 | ||
a7f290da BH |
172 | /* |
173 | * This is called from binfmt_elf, we create the special vma for the | |
174 | * vDSO and insert it into the mm struct tree | |
175 | */ | |
176 | int arch_setup_additional_pages(struct linux_binprm *bprm, | |
177 | int executable_stack) | |
178 | { | |
179 | struct mm_struct *mm = current->mm; | |
c13e4ca2 | 180 | struct page **vdso_pagelist; |
a7f290da BH |
181 | unsigned long vdso_pages; |
182 | unsigned long vdso_base; | |
a5bba930 | 183 | int rc; |
a7f290da BH |
184 | |
185 | #ifdef CONFIG_PPC64 | |
186 | if (test_thread_flag(TIF_32BIT)) { | |
c13e4ca2 | 187 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
188 | vdso_pages = vdso32_pages; |
189 | vdso_base = VDSO32_MBASE; | |
190 | } else { | |
c13e4ca2 | 191 | vdso_pagelist = vdso64_pagelist; |
a7f290da BH |
192 | vdso_pages = vdso64_pages; |
193 | vdso_base = VDSO64_MBASE; | |
194 | } | |
195 | #else | |
c13e4ca2 | 196 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
197 | vdso_pages = vdso32_pages; |
198 | vdso_base = VDSO32_MBASE; | |
199 | #endif | |
200 | ||
a5bba930 | 201 | current->mm->context.vdso_base = 0; |
a7f290da BH |
202 | |
203 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
204 | * process | |
205 | */ | |
206 | if (vdso_pages == 0) | |
207 | return 0; | |
a7f290da BH |
208 | /* Add a page to the vdso size for the data page */ |
209 | vdso_pages ++; | |
210 | ||
211 | /* | |
212 | * pick a base address for the vDSO in process space. We try to put it | |
213 | * at vdso_base which is the "natural" base for it, but we might fail | |
214 | * and end up putting it elsewhere. | |
215 | */ | |
a5bba930 | 216 | down_write(&mm->mmap_sem); |
a7f290da BH |
217 | vdso_base = get_unmapped_area(NULL, vdso_base, |
218 | vdso_pages << PAGE_SHIFT, 0, 0); | |
a5bba930 BH |
219 | if (IS_ERR_VALUE(vdso_base)) { |
220 | rc = vdso_base; | |
221 | goto fail_mmapsem; | |
a7f290da BH |
222 | } |
223 | ||
a7f290da BH |
224 | /* |
225 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
226 | * allowed to write those pages. | |
227 | * gdb can break that with ptrace interface, and thus trigger COW on | |
228 | * those pages but it's then your responsibility to never do that on | |
229 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
230 | * and your nice userland gettimeofday will be totally dead. | |
231 | * It's fine to use that for setting breakpoints in the vDSO code | |
232 | * pages though | |
c13e4ca2 | 233 | * |
3a0cfadb RM |
234 | * Make sure the vDSO gets into every core dump. |
235 | * Dumping its contents makes post-mortem fully interpretable later | |
236 | * without matching up the same kernel and hardware config to see | |
237 | * what PC values meant. | |
238 | */ | |
c13e4ca2 RM |
239 | rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, |
240 | VM_READ|VM_EXEC| | |
241 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| | |
242 | VM_ALWAYSDUMP, | |
243 | vdso_pagelist); | |
a5bba930 | 244 | if (rc) |
c13e4ca2 | 245 | goto fail_mmapsem; |
a5bba930 | 246 | |
c13e4ca2 | 247 | /* Put vDSO base into mm struct */ |
a5bba930 | 248 | current->mm->context.vdso_base = vdso_base; |
c13e4ca2 | 249 | |
a7f290da | 250 | up_write(&mm->mmap_sem); |
a7f290da | 251 | return 0; |
a5bba930 | 252 | |
a5bba930 BH |
253 | fail_mmapsem: |
254 | up_write(&mm->mmap_sem); | |
255 | return rc; | |
256 | } | |
257 | ||
258 | const char *arch_vma_name(struct vm_area_struct *vma) | |
259 | { | |
260 | if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) | |
261 | return "[vdso]"; | |
262 | return NULL; | |
a7f290da BH |
263 | } |
264 | ||
a5bba930 BH |
265 | |
266 | ||
a7f290da BH |
267 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, |
268 | unsigned long *size) | |
269 | { | |
270 | Elf32_Shdr *sechdrs; | |
271 | unsigned int i; | |
272 | char *secnames; | |
273 | ||
274 | /* Grab section headers and strings so we can tell who is who */ | |
275 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
276 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
277 | ||
278 | /* Find the section they want */ | |
279 | for (i = 1; i < ehdr->e_shnum; i++) { | |
280 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
281 | if (size) | |
282 | *size = sechdrs[i].sh_size; | |
283 | return (void *)ehdr + sechdrs[i].sh_offset; | |
284 | } | |
285 | } | |
286 | *size = 0; | |
287 | return NULL; | |
288 | } | |
289 | ||
290 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
291 | const char *symname) | |
292 | { | |
293 | unsigned int i; | |
294 | char name[MAX_SYMNAME], *c; | |
295 | ||
296 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
297 | if (lib->dynsym[i].st_name == 0) | |
298 | continue; | |
299 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
300 | MAX_SYMNAME); | |
301 | c = strchr(name, '@'); | |
302 | if (c) | |
303 | *c = 0; | |
304 | if (strcmp(symname, name) == 0) | |
305 | return &lib->dynsym[i]; | |
306 | } | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | /* Note that we assume the section is .text and the symbol is relative to | |
311 | * the library base | |
312 | */ | |
313 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
314 | const char *symname) | |
315 | { | |
316 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
317 | ||
318 | if (sym == NULL) { | |
319 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
320 | symname); | |
321 | return 0; | |
322 | } | |
323 | return sym->st_value - VDSO32_LBASE; | |
324 | } | |
325 | ||
326 | static int vdso_do_func_patch32(struct lib32_elfinfo *v32, | |
327 | struct lib64_elfinfo *v64, | |
328 | const char *orig, const char *fix) | |
329 | { | |
330 | Elf32_Sym *sym32_gen, *sym32_fix; | |
331 | ||
332 | sym32_gen = find_symbol32(v32, orig); | |
333 | if (sym32_gen == NULL) { | |
334 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
335 | return -1; | |
336 | } | |
337 | if (fix == NULL) { | |
338 | sym32_gen->st_name = 0; | |
339 | return 0; | |
340 | } | |
341 | sym32_fix = find_symbol32(v32, fix); | |
342 | if (sym32_fix == NULL) { | |
343 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
344 | return -1; | |
345 | } | |
346 | sym32_gen->st_value = sym32_fix->st_value; | |
347 | sym32_gen->st_size = sym32_fix->st_size; | |
348 | sym32_gen->st_info = sym32_fix->st_info; | |
349 | sym32_gen->st_other = sym32_fix->st_other; | |
350 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | ||
356 | #ifdef CONFIG_PPC64 | |
357 | ||
358 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
359 | unsigned long *size) | |
360 | { | |
361 | Elf64_Shdr *sechdrs; | |
362 | unsigned int i; | |
363 | char *secnames; | |
364 | ||
365 | /* Grab section headers and strings so we can tell who is who */ | |
366 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
367 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
368 | ||
369 | /* Find the section they want */ | |
370 | for (i = 1; i < ehdr->e_shnum; i++) { | |
371 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
372 | if (size) | |
373 | *size = sechdrs[i].sh_size; | |
374 | return (void *)ehdr + sechdrs[i].sh_offset; | |
375 | } | |
376 | } | |
377 | if (size) | |
378 | *size = 0; | |
379 | return NULL; | |
380 | } | |
381 | ||
382 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
383 | const char *symname) | |
384 | { | |
385 | unsigned int i; | |
386 | char name[MAX_SYMNAME], *c; | |
387 | ||
388 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
389 | if (lib->dynsym[i].st_name == 0) | |
390 | continue; | |
391 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
392 | MAX_SYMNAME); | |
393 | c = strchr(name, '@'); | |
394 | if (c) | |
395 | *c = 0; | |
396 | if (strcmp(symname, name) == 0) | |
397 | return &lib->dynsym[i]; | |
398 | } | |
399 | return NULL; | |
400 | } | |
401 | ||
402 | /* Note that we assume the section is .text and the symbol is relative to | |
403 | * the library base | |
404 | */ | |
405 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
406 | const char *symname) | |
407 | { | |
408 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
409 | ||
410 | if (sym == NULL) { | |
411 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
412 | symname); | |
413 | return 0; | |
414 | } | |
415 | #ifdef VDS64_HAS_DESCRIPTORS | |
416 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
417 | VDSO64_LBASE; | |
418 | #else | |
419 | return sym->st_value - VDSO64_LBASE; | |
420 | #endif | |
421 | } | |
422 | ||
423 | static int vdso_do_func_patch64(struct lib32_elfinfo *v32, | |
424 | struct lib64_elfinfo *v64, | |
425 | const char *orig, const char *fix) | |
426 | { | |
427 | Elf64_Sym *sym64_gen, *sym64_fix; | |
428 | ||
429 | sym64_gen = find_symbol64(v64, orig); | |
430 | if (sym64_gen == NULL) { | |
431 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
432 | return -1; | |
433 | } | |
434 | if (fix == NULL) { | |
435 | sym64_gen->st_name = 0; | |
436 | return 0; | |
437 | } | |
438 | sym64_fix = find_symbol64(v64, fix); | |
439 | if (sym64_fix == NULL) { | |
440 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
441 | return -1; | |
442 | } | |
443 | sym64_gen->st_value = sym64_fix->st_value; | |
444 | sym64_gen->st_size = sym64_fix->st_size; | |
445 | sym64_gen->st_info = sym64_fix->st_info; | |
446 | sym64_gen->st_other = sym64_fix->st_other; | |
447 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | #endif /* CONFIG_PPC64 */ | |
453 | ||
454 | ||
455 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
456 | struct lib64_elfinfo *v64) | |
457 | { | |
458 | void *sect; | |
459 | ||
460 | /* | |
461 | * Locate symbol tables & text section | |
462 | */ | |
463 | ||
464 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); | |
465 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
466 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
467 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
468 | return -1; | |
469 | } | |
470 | sect = find_section32(v32->hdr, ".text", NULL); | |
471 | if (sect == NULL) { | |
472 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
473 | return -1; | |
474 | } | |
475 | v32->text = sect - vdso32_kbase; | |
476 | ||
477 | #ifdef CONFIG_PPC64 | |
478 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
479 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
480 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
481 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
482 | return -1; | |
483 | } | |
484 | sect = find_section64(v64->hdr, ".text", NULL); | |
485 | if (sect == NULL) { | |
486 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
487 | return -1; | |
488 | } | |
489 | v64->text = sect - vdso64_kbase; | |
490 | #endif /* CONFIG_PPC64 */ | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
496 | struct lib64_elfinfo *v64) | |
497 | { | |
498 | /* | |
499 | * Find signal trampolines | |
500 | */ | |
501 | ||
502 | #ifdef CONFIG_PPC64 | |
503 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
504 | #endif | |
505 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
506 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
507 | } | |
508 | ||
509 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
510 | struct lib64_elfinfo *v64) | |
511 | { | |
512 | Elf32_Sym *sym32; | |
513 | #ifdef CONFIG_PPC64 | |
514 | Elf64_Sym *sym64; | |
515 | ||
516 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
517 | if (sym64 == NULL) { | |
518 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
519 | "__kernel_datapage_offset !\n"); | |
520 | return -1; | |
521 | } | |
522 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
523 | (vdso64_pages << PAGE_SHIFT) - | |
524 | (sym64->st_value - VDSO64_LBASE); | |
525 | #endif /* CONFIG_PPC64 */ | |
526 | ||
527 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); | |
528 | if (sym32 == NULL) { | |
529 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
530 | "__kernel_datapage_offset !\n"); | |
531 | return -1; | |
532 | } | |
533 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
534 | (vdso32_pages << PAGE_SHIFT) - | |
535 | (sym32->st_value - VDSO32_LBASE); | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
0909c8c2 BH |
540 | |
541 | static __init int vdso_fixup_features(struct lib32_elfinfo *v32, | |
542 | struct lib64_elfinfo *v64) | |
543 | { | |
544 | void *start32; | |
545 | unsigned long size32; | |
546 | ||
547 | #ifdef CONFIG_PPC64 | |
548 | void *start64; | |
549 | unsigned long size64; | |
550 | ||
551 | start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); | |
552 | if (start64) | |
553 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
554 | start64, start64 + size64); | |
555 | ||
556 | start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); | |
557 | if (start64) | |
558 | do_feature_fixups(powerpc_firmware_features, | |
559 | start64, start64 + size64); | |
560 | #endif /* CONFIG_PPC64 */ | |
561 | ||
562 | start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); | |
563 | if (start32) | |
564 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
565 | start32, start32 + size32); | |
566 | ||
567 | #ifdef CONFIG_PPC64 | |
568 | start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); | |
569 | if (start32) | |
570 | do_feature_fixups(powerpc_firmware_features, | |
571 | start32, start32 + size32); | |
572 | #endif /* CONFIG_PPC64 */ | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
a7f290da BH |
577 | static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, |
578 | struct lib64_elfinfo *v64) | |
579 | { | |
580 | int i; | |
581 | ||
582 | for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { | |
583 | struct vdso_patch_def *patch = &vdso_patches[i]; | |
584 | int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) | |
585 | == patch->ftr_value; | |
586 | if (!match) | |
587 | continue; | |
588 | ||
589 | DBG("replacing %s with %s...\n", patch->gen_name, | |
590 | patch->fix_name ? "NONE" : patch->fix_name); | |
591 | ||
592 | /* | |
593 | * Patch the 32 bits and 64 bits symbols. Note that we do not | |
594 | * patch the "." symbol on 64 bits. | |
595 | * It would be easy to do, but doesn't seem to be necessary, | |
596 | * patching the OPD symbol is enough. | |
597 | */ | |
598 | vdso_do_func_patch32(v32, v64, patch->gen_name, | |
599 | patch->fix_name); | |
600 | #ifdef CONFIG_PPC64 | |
601 | vdso_do_func_patch64(v32, v64, patch->gen_name, | |
602 | patch->fix_name); | |
603 | #endif /* CONFIG_PPC64 */ | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | ||
610 | static __init int vdso_setup(void) | |
611 | { | |
612 | struct lib32_elfinfo v32; | |
613 | struct lib64_elfinfo v64; | |
614 | ||
615 | v32.hdr = vdso32_kbase; | |
616 | #ifdef CONFIG_PPC64 | |
617 | v64.hdr = vdso64_kbase; | |
618 | #endif | |
619 | if (vdso_do_find_sections(&v32, &v64)) | |
620 | return -1; | |
621 | ||
622 | if (vdso_fixup_datapage(&v32, &v64)) | |
623 | return -1; | |
624 | ||
0909c8c2 BH |
625 | if (vdso_fixup_features(&v32, &v64)) |
626 | return -1; | |
627 | ||
a7f290da BH |
628 | if (vdso_fixup_alt_funcs(&v32, &v64)) |
629 | return -1; | |
630 | ||
631 | vdso_setup_trampolines(&v32, &v64); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Called from setup_arch to initialize the bitmap of available | |
638 | * syscalls in the systemcfg page | |
639 | */ | |
640 | static void __init vdso_setup_syscall_map(void) | |
641 | { | |
642 | unsigned int i; | |
643 | extern unsigned long *sys_call_table; | |
644 | extern unsigned long sys_ni_syscall; | |
645 | ||
646 | ||
647 | for (i = 0; i < __NR_syscalls; i++) { | |
648 | #ifdef CONFIG_PPC64 | |
649 | if (sys_call_table[i*2] != sys_ni_syscall) | |
650 | vdso_data->syscall_map_64[i >> 5] |= | |
651 | 0x80000000UL >> (i & 0x1f); | |
652 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
653 | vdso_data->syscall_map_32[i >> 5] |= | |
654 | 0x80000000UL >> (i & 0x1f); | |
655 | #else /* CONFIG_PPC64 */ | |
656 | if (sys_call_table[i] != sys_ni_syscall) | |
657 | vdso_data->syscall_map_32[i >> 5] |= | |
658 | 0x80000000UL >> (i & 0x1f); | |
659 | #endif /* CONFIG_PPC64 */ | |
660 | } | |
661 | } | |
662 | ||
663 | ||
664 | void __init vdso_init(void) | |
665 | { | |
666 | int i; | |
667 | ||
668 | #ifdef CONFIG_PPC64 | |
669 | /* | |
670 | * Fill up the "systemcfg" stuff for backward compatiblity | |
671 | */ | |
672 | strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); | |
673 | vdso_data->version.major = SYSTEMCFG_MAJOR; | |
674 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
675 | vdso_data->processor = mfspr(SPRN_PVR); | |
e8222502 BH |
676 | /* |
677 | * Fake the old platform number for pSeries and iSeries and add | |
678 | * in LPAR bit if necessary | |
679 | */ | |
680 | vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100; | |
681 | if (firmware_has_feature(FW_FEATURE_LPAR)) | |
682 | vdso_data->platform |= 1; | |
a7f290da BH |
683 | vdso_data->physicalMemorySize = lmb_phys_mem_size(); |
684 | vdso_data->dcache_size = ppc64_caches.dsize; | |
685 | vdso_data->dcache_line_size = ppc64_caches.dline_size; | |
686 | vdso_data->icache_size = ppc64_caches.isize; | |
687 | vdso_data->icache_line_size = ppc64_caches.iline_size; | |
688 | ||
689 | /* | |
690 | * Calculate the size of the 64 bits vDSO | |
691 | */ | |
692 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
693 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
694 | #endif /* CONFIG_PPC64 */ | |
695 | ||
696 | ||
697 | /* | |
698 | * Calculate the size of the 32 bits vDSO | |
699 | */ | |
700 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
701 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
702 | ||
703 | ||
704 | /* | |
705 | * Setup the syscall map in the vDOS | |
706 | */ | |
707 | vdso_setup_syscall_map(); | |
0909c8c2 | 708 | |
a7f290da BH |
709 | /* |
710 | * Initialize the vDSO images in memory, that is do necessary | |
711 | * fixups of vDSO symbols, locate trampolines, etc... | |
712 | */ | |
713 | if (vdso_setup()) { | |
714 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
715 | vdso32_pages = 0; | |
716 | #ifdef CONFIG_PPC64 | |
717 | vdso64_pages = 0; | |
718 | #endif | |
719 | return; | |
720 | } | |
721 | ||
722 | /* Make sure pages are in the correct state */ | |
c13e4ca2 | 723 | BUG_ON(vdso32_pages + 2 > VDSO32_MAXPAGES); |
a7f290da BH |
724 | for (i = 0; i < vdso32_pages; i++) { |
725 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
726 | ClearPageReserved(pg); | |
727 | get_page(pg); | |
c13e4ca2 | 728 | vdso32_pagelist[i] = pg; |
a7f290da | 729 | } |
c13e4ca2 RM |
730 | vdso32_pagelist[i++] = virt_to_page(vdso_data); |
731 | vdso32_pagelist[i] = NULL; | |
732 | ||
a7f290da | 733 | #ifdef CONFIG_PPC64 |
c13e4ca2 | 734 | BUG_ON(vdso64_pages + 2 > VDSO64_MAXPAGES); |
a7f290da BH |
735 | for (i = 0; i < vdso64_pages; i++) { |
736 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
737 | ClearPageReserved(pg); | |
738 | get_page(pg); | |
c13e4ca2 | 739 | vdso64_pagelist[i] = pg; |
a7f290da | 740 | } |
c13e4ca2 RM |
741 | vdso64_pagelist[i++] = virt_to_page(vdso_data); |
742 | vdso64_pagelist[i] = NULL; | |
a7f290da BH |
743 | #endif /* CONFIG_PPC64 */ |
744 | ||
745 | get_page(virt_to_page(vdso_data)); | |
746 | } | |
747 | ||
748 | int in_gate_area_no_task(unsigned long addr) | |
749 | { | |
750 | return 0; | |
751 | } | |
752 | ||
753 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
754 | { | |
755 | return 0; | |
756 | } | |
757 | ||
758 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) | |
759 | { | |
760 | return NULL; | |
761 | } | |
762 |