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abe1ee3a | 1 | |
a7f290da | 2 | /* |
a7f290da BH |
3 | * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. |
4 | * <benh@kernel.crashing.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
a7f290da BH |
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> | |
95f72d1e | 24 | #include <linux/memblock.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 | ||
348aa303 AS |
52 | /* The alignment of the vDSO */ |
53 | #define VDSO_ALIGNMENT (1 << 16) | |
54 | ||
a7f290da BH |
55 | extern char vdso32_start, vdso32_end; |
56 | static void *vdso32_kbase = &vdso32_start; | |
7ac9a137 BH |
57 | static unsigned int vdso32_pages; |
58 | static struct page **vdso32_pagelist; | |
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; | |
7ac9a137 BH |
65 | static unsigned int vdso64_pages; |
66 | static struct page **vdso64_pagelist; | |
a7f290da BH |
67 | unsigned long vdso64_rt_sigtramp; |
68 | #endif /* CONFIG_PPC64 */ | |
69 | ||
7ac9a137 BH |
70 | static int vdso_ready; |
71 | ||
a7f290da BH |
72 | /* |
73 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
74 | * Once the early boot kernel code no longer needs to muck around | |
75 | * with it, it will become dynamically allocated | |
76 | */ | |
77 | static union { | |
78 | struct vdso_data data; | |
79 | u8 page[PAGE_SIZE]; | |
abe1ee3a | 80 | } vdso_data_store __page_aligned_data; |
a7f290da BH |
81 | struct vdso_data *vdso_data = &vdso_data_store.data; |
82 | ||
83 | /* Format of the patch table */ | |
84 | struct vdso_patch_def | |
85 | { | |
86 | unsigned long ftr_mask, ftr_value; | |
87 | const char *gen_name; | |
88 | const char *fix_name; | |
89 | }; | |
90 | ||
91 | /* Table of functions to patch based on the CPU type/revision | |
92 | * | |
93 | * Currently, we only change sync_dicache to do nothing on processors | |
94 | * with a coherent icache | |
95 | */ | |
96 | static struct vdso_patch_def vdso_patches[] = { | |
97 | { | |
98 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
99 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
100 | }, | |
101 | { | |
102 | CPU_FTR_USE_TB, 0, | |
103 | "__kernel_gettimeofday", NULL | |
104 | }, | |
7b5acbaa BH |
105 | { |
106 | CPU_FTR_USE_TB, 0, | |
107 | "__kernel_clock_gettime", NULL | |
108 | }, | |
109 | { | |
110 | CPU_FTR_USE_TB, 0, | |
111 | "__kernel_clock_getres", NULL | |
112 | }, | |
113 | { | |
114 | CPU_FTR_USE_TB, 0, | |
115 | "__kernel_get_tbfreq", NULL | |
116 | }, | |
a7f290da BH |
117 | }; |
118 | ||
119 | /* | |
120 | * Some infos carried around for each of them during parsing at | |
121 | * boot time. | |
122 | */ | |
123 | struct lib32_elfinfo | |
124 | { | |
125 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
126 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
127 | unsigned long dynsymsize; /* size of .dynsym section */ | |
128 | char *dynstr; /* ptr to .dynstr section */ | |
129 | unsigned long text; /* offset of .text section in .so */ | |
130 | }; | |
131 | ||
132 | struct lib64_elfinfo | |
133 | { | |
134 | Elf64_Ehdr *hdr; | |
135 | Elf64_Sym *dynsym; | |
136 | unsigned long dynsymsize; | |
137 | char *dynstr; | |
138 | unsigned long text; | |
139 | }; | |
140 | ||
141 | ||
142 | #ifdef __DEBUG | |
143 | static void dump_one_vdso_page(struct page *pg, struct page *upg) | |
144 | { | |
145 | printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT), | |
146 | page_count(pg), | |
147 | pg->flags); | |
89f5b7da | 148 | if (upg && !IS_ERR(upg) /* && pg != upg*/) { |
a7f290da BH |
149 | printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg) |
150 | << PAGE_SHIFT), | |
151 | page_count(upg), | |
152 | upg->flags); | |
153 | } | |
154 | printk("\n"); | |
155 | } | |
156 | ||
157 | static void dump_vdso_pages(struct vm_area_struct * vma) | |
158 | { | |
159 | int i; | |
160 | ||
cab175f9 | 161 | if (!vma || is_32bit_task()) { |
a7f290da BH |
162 | printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase); |
163 | for (i=0; i<vdso32_pages; i++) { | |
164 | struct page *pg = virt_to_page(vdso32_kbase + | |
165 | i*PAGE_SIZE); | |
166 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 167 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
168 | : NULL; |
169 | dump_one_vdso_page(pg, upg); | |
170 | } | |
171 | } | |
cab175f9 | 172 | if (!vma || !is_32bit_task()) { |
a7f290da BH |
173 | printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase); |
174 | for (i=0; i<vdso64_pages; i++) { | |
175 | struct page *pg = virt_to_page(vdso64_kbase + | |
176 | i*PAGE_SIZE); | |
177 | struct page *upg = (vma && vma->vm_mm) ? | |
6aab341e | 178 | follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0) |
a7f290da BH |
179 | : NULL; |
180 | dump_one_vdso_page(pg, upg); | |
181 | } | |
182 | } | |
183 | } | |
184 | #endif /* DEBUG */ | |
185 | ||
a7f290da BH |
186 | /* |
187 | * This is called from binfmt_elf, we create the special vma for the | |
188 | * vDSO and insert it into the mm struct tree | |
189 | */ | |
fc5243d9 | 190 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
a7f290da BH |
191 | { |
192 | struct mm_struct *mm = current->mm; | |
c13e4ca2 | 193 | struct page **vdso_pagelist; |
a7f290da BH |
194 | unsigned long vdso_pages; |
195 | unsigned long vdso_base; | |
a5bba930 | 196 | int rc; |
a7f290da | 197 | |
7ac9a137 BH |
198 | if (!vdso_ready) |
199 | return 0; | |
200 | ||
a7f290da | 201 | #ifdef CONFIG_PPC64 |
cab175f9 | 202 | if (is_32bit_task()) { |
c13e4ca2 | 203 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
204 | vdso_pages = vdso32_pages; |
205 | vdso_base = VDSO32_MBASE; | |
206 | } else { | |
c13e4ca2 | 207 | vdso_pagelist = vdso64_pagelist; |
a7f290da | 208 | vdso_pages = vdso64_pages; |
30d0b368 AB |
209 | /* |
210 | * On 64bit we don't have a preferred map address. This | |
211 | * allows get_unmapped_area to find an area near other mmaps | |
212 | * and most likely share a SLB entry. | |
213 | */ | |
214 | vdso_base = 0; | |
a7f290da BH |
215 | } |
216 | #else | |
c13e4ca2 | 217 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
218 | vdso_pages = vdso32_pages; |
219 | vdso_base = VDSO32_MBASE; | |
220 | #endif | |
221 | ||
a5bba930 | 222 | current->mm->context.vdso_base = 0; |
a7f290da BH |
223 | |
224 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
225 | * process | |
226 | */ | |
227 | if (vdso_pages == 0) | |
228 | return 0; | |
a7f290da BH |
229 | /* Add a page to the vdso size for the data page */ |
230 | vdso_pages ++; | |
231 | ||
232 | /* | |
233 | * pick a base address for the vDSO in process space. We try to put it | |
234 | * at vdso_base which is the "natural" base for it, but we might fail | |
235 | * and end up putting it elsewhere. | |
348aa303 | 236 | * Add enough to the size so that the result can be aligned. |
a7f290da | 237 | */ |
a5bba930 | 238 | down_write(&mm->mmap_sem); |
a7f290da | 239 | vdso_base = get_unmapped_area(NULL, vdso_base, |
348aa303 AS |
240 | (vdso_pages << PAGE_SHIFT) + |
241 | ((VDSO_ALIGNMENT - 1) & PAGE_MASK), | |
242 | 0, 0); | |
a5bba930 BH |
243 | if (IS_ERR_VALUE(vdso_base)) { |
244 | rc = vdso_base; | |
245 | goto fail_mmapsem; | |
a7f290da BH |
246 | } |
247 | ||
348aa303 AS |
248 | /* Add required alignment. */ |
249 | vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); | |
250 | ||
f2053f1a AB |
251 | /* |
252 | * Put vDSO base into mm struct. We need to do this before calling | |
253 | * install_special_mapping or the perf counter mmap tracking code | |
254 | * will fail to recognise it as a vDSO (since arch_vma_name fails). | |
255 | */ | |
256 | current->mm->context.vdso_base = vdso_base; | |
257 | ||
a7f290da BH |
258 | /* |
259 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
260 | * allowed to write those pages. | |
261 | * gdb can break that with ptrace interface, and thus trigger COW on | |
262 | * those pages but it's then your responsibility to never do that on | |
263 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
264 | * and your nice userland gettimeofday will be totally dead. | |
265 | * It's fine to use that for setting breakpoints in the vDSO code | |
909af768 | 266 | * pages though. |
3a0cfadb | 267 | */ |
c13e4ca2 RM |
268 | rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, |
269 | VM_READ|VM_EXEC| | |
909af768 | 270 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, |
c13e4ca2 | 271 | vdso_pagelist); |
f2053f1a AB |
272 | if (rc) { |
273 | current->mm->context.vdso_base = 0; | |
c13e4ca2 | 274 | goto fail_mmapsem; |
f2053f1a | 275 | } |
c13e4ca2 | 276 | |
a7f290da | 277 | up_write(&mm->mmap_sem); |
a7f290da | 278 | return 0; |
a5bba930 | 279 | |
a5bba930 BH |
280 | fail_mmapsem: |
281 | up_write(&mm->mmap_sem); | |
282 | return rc; | |
283 | } | |
284 | ||
285 | const char *arch_vma_name(struct vm_area_struct *vma) | |
286 | { | |
287 | if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) | |
288 | return "[vdso]"; | |
289 | return NULL; | |
a7f290da BH |
290 | } |
291 | ||
a5bba930 BH |
292 | |
293 | ||
a7f290da BH |
294 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, |
295 | unsigned long *size) | |
296 | { | |
297 | Elf32_Shdr *sechdrs; | |
298 | unsigned int i; | |
299 | char *secnames; | |
300 | ||
301 | /* Grab section headers and strings so we can tell who is who */ | |
302 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
303 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
304 | ||
305 | /* Find the section they want */ | |
306 | for (i = 1; i < ehdr->e_shnum; i++) { | |
307 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
308 | if (size) | |
309 | *size = sechdrs[i].sh_size; | |
310 | return (void *)ehdr + sechdrs[i].sh_offset; | |
311 | } | |
312 | } | |
313 | *size = 0; | |
314 | return NULL; | |
315 | } | |
316 | ||
317 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
318 | const char *symname) | |
319 | { | |
320 | unsigned int i; | |
321 | char name[MAX_SYMNAME], *c; | |
322 | ||
323 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
324 | if (lib->dynsym[i].st_name == 0) | |
325 | continue; | |
326 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
327 | MAX_SYMNAME); | |
328 | c = strchr(name, '@'); | |
329 | if (c) | |
330 | *c = 0; | |
331 | if (strcmp(symname, name) == 0) | |
332 | return &lib->dynsym[i]; | |
333 | } | |
334 | return NULL; | |
335 | } | |
336 | ||
337 | /* Note that we assume the section is .text and the symbol is relative to | |
338 | * the library base | |
339 | */ | |
340 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
341 | const char *symname) | |
342 | { | |
343 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
344 | ||
345 | if (sym == NULL) { | |
346 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
347 | symname); | |
348 | return 0; | |
349 | } | |
350 | return sym->st_value - VDSO32_LBASE; | |
351 | } | |
352 | ||
cf8918fe AB |
353 | static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, |
354 | struct lib64_elfinfo *v64, | |
355 | const char *orig, const char *fix) | |
a7f290da BH |
356 | { |
357 | Elf32_Sym *sym32_gen, *sym32_fix; | |
358 | ||
359 | sym32_gen = find_symbol32(v32, orig); | |
360 | if (sym32_gen == NULL) { | |
361 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
362 | return -1; | |
363 | } | |
364 | if (fix == NULL) { | |
365 | sym32_gen->st_name = 0; | |
366 | return 0; | |
367 | } | |
368 | sym32_fix = find_symbol32(v32, fix); | |
369 | if (sym32_fix == NULL) { | |
370 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
371 | return -1; | |
372 | } | |
373 | sym32_gen->st_value = sym32_fix->st_value; | |
374 | sym32_gen->st_size = sym32_fix->st_size; | |
375 | sym32_gen->st_info = sym32_fix->st_info; | |
376 | sym32_gen->st_other = sym32_fix->st_other; | |
377 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | ||
383 | #ifdef CONFIG_PPC64 | |
384 | ||
385 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
386 | unsigned long *size) | |
387 | { | |
388 | Elf64_Shdr *sechdrs; | |
389 | unsigned int i; | |
390 | char *secnames; | |
391 | ||
392 | /* Grab section headers and strings so we can tell who is who */ | |
393 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
394 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
395 | ||
396 | /* Find the section they want */ | |
397 | for (i = 1; i < ehdr->e_shnum; i++) { | |
398 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
399 | if (size) | |
400 | *size = sechdrs[i].sh_size; | |
401 | return (void *)ehdr + sechdrs[i].sh_offset; | |
402 | } | |
403 | } | |
404 | if (size) | |
405 | *size = 0; | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
410 | const char *symname) | |
411 | { | |
412 | unsigned int i; | |
413 | char name[MAX_SYMNAME], *c; | |
414 | ||
415 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
416 | if (lib->dynsym[i].st_name == 0) | |
417 | continue; | |
418 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
419 | MAX_SYMNAME); | |
420 | c = strchr(name, '@'); | |
421 | if (c) | |
422 | *c = 0; | |
423 | if (strcmp(symname, name) == 0) | |
424 | return &lib->dynsym[i]; | |
425 | } | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | /* Note that we assume the section is .text and the symbol is relative to | |
430 | * the library base | |
431 | */ | |
432 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
433 | const char *symname) | |
434 | { | |
435 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
436 | ||
437 | if (sym == NULL) { | |
438 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
439 | symname); | |
440 | return 0; | |
441 | } | |
442 | #ifdef VDS64_HAS_DESCRIPTORS | |
443 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
444 | VDSO64_LBASE; | |
445 | #else | |
446 | return sym->st_value - VDSO64_LBASE; | |
447 | #endif | |
448 | } | |
449 | ||
cf8918fe AB |
450 | static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, |
451 | struct lib64_elfinfo *v64, | |
452 | const char *orig, const char *fix) | |
a7f290da BH |
453 | { |
454 | Elf64_Sym *sym64_gen, *sym64_fix; | |
455 | ||
456 | sym64_gen = find_symbol64(v64, orig); | |
457 | if (sym64_gen == NULL) { | |
458 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
459 | return -1; | |
460 | } | |
461 | if (fix == NULL) { | |
462 | sym64_gen->st_name = 0; | |
463 | return 0; | |
464 | } | |
465 | sym64_fix = find_symbol64(v64, fix); | |
466 | if (sym64_fix == NULL) { | |
467 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
468 | return -1; | |
469 | } | |
470 | sym64_gen->st_value = sym64_fix->st_value; | |
471 | sym64_gen->st_size = sym64_fix->st_size; | |
472 | sym64_gen->st_info = sym64_fix->st_info; | |
473 | sym64_gen->st_other = sym64_fix->st_other; | |
474 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | #endif /* CONFIG_PPC64 */ | |
480 | ||
481 | ||
482 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
483 | struct lib64_elfinfo *v64) | |
484 | { | |
485 | void *sect; | |
486 | ||
487 | /* | |
488 | * Locate symbol tables & text section | |
489 | */ | |
490 | ||
491 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); | |
492 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
493 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
494 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
495 | return -1; | |
496 | } | |
497 | sect = find_section32(v32->hdr, ".text", NULL); | |
498 | if (sect == NULL) { | |
499 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
500 | return -1; | |
501 | } | |
502 | v32->text = sect - vdso32_kbase; | |
503 | ||
504 | #ifdef CONFIG_PPC64 | |
505 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
506 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
507 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
508 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
509 | return -1; | |
510 | } | |
511 | sect = find_section64(v64->hdr, ".text", NULL); | |
512 | if (sect == NULL) { | |
513 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
514 | return -1; | |
515 | } | |
516 | v64->text = sect - vdso64_kbase; | |
517 | #endif /* CONFIG_PPC64 */ | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
523 | struct lib64_elfinfo *v64) | |
524 | { | |
525 | /* | |
526 | * Find signal trampolines | |
527 | */ | |
528 | ||
529 | #ifdef CONFIG_PPC64 | |
530 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
531 | #endif | |
532 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
533 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
534 | } | |
535 | ||
536 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
537 | struct lib64_elfinfo *v64) | |
538 | { | |
539 | Elf32_Sym *sym32; | |
540 | #ifdef CONFIG_PPC64 | |
541 | Elf64_Sym *sym64; | |
542 | ||
543 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
544 | if (sym64 == NULL) { | |
545 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
546 | "__kernel_datapage_offset !\n"); | |
547 | return -1; | |
548 | } | |
549 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
550 | (vdso64_pages << PAGE_SHIFT) - | |
551 | (sym64->st_value - VDSO64_LBASE); | |
552 | #endif /* CONFIG_PPC64 */ | |
553 | ||
554 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); | |
555 | if (sym32 == NULL) { | |
556 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
557 | "__kernel_datapage_offset !\n"); | |
558 | return -1; | |
559 | } | |
560 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
561 | (vdso32_pages << PAGE_SHIFT) - | |
562 | (sym32->st_value - VDSO32_LBASE); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
0909c8c2 BH |
567 | |
568 | static __init int vdso_fixup_features(struct lib32_elfinfo *v32, | |
569 | struct lib64_elfinfo *v64) | |
570 | { | |
571 | void *start32; | |
572 | unsigned long size32; | |
573 | ||
574 | #ifdef CONFIG_PPC64 | |
575 | void *start64; | |
576 | unsigned long size64; | |
577 | ||
578 | start64 = find_section64(v64->hdr, "__ftr_fixup", &size64); | |
579 | if (start64) | |
580 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
581 | start64, start64 + size64); | |
582 | ||
7c03d653 BH |
583 | start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64); |
584 | if (start64) | |
585 | do_feature_fixups(cur_cpu_spec->mmu_features, | |
586 | start64, start64 + size64); | |
587 | ||
0909c8c2 BH |
588 | start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64); |
589 | if (start64) | |
590 | do_feature_fixups(powerpc_firmware_features, | |
591 | start64, start64 + size64); | |
2d1b2027 KG |
592 | |
593 | start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64); | |
594 | if (start64) | |
595 | do_lwsync_fixups(cur_cpu_spec->cpu_features, | |
596 | start64, start64 + size64); | |
0909c8c2 BH |
597 | #endif /* CONFIG_PPC64 */ |
598 | ||
599 | start32 = find_section32(v32->hdr, "__ftr_fixup", &size32); | |
600 | if (start32) | |
601 | do_feature_fixups(cur_cpu_spec->cpu_features, | |
602 | start32, start32 + size32); | |
603 | ||
7c03d653 BH |
604 | start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32); |
605 | if (start32) | |
606 | do_feature_fixups(cur_cpu_spec->mmu_features, | |
607 | start32, start32 + size32); | |
608 | ||
0909c8c2 BH |
609 | #ifdef CONFIG_PPC64 |
610 | start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32); | |
611 | if (start32) | |
612 | do_feature_fixups(powerpc_firmware_features, | |
613 | start32, start32 + size32); | |
614 | #endif /* CONFIG_PPC64 */ | |
615 | ||
2d1b2027 KG |
616 | start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32); |
617 | if (start32) | |
618 | do_lwsync_fixups(cur_cpu_spec->cpu_features, | |
619 | start32, start32 + size32); | |
620 | ||
0909c8c2 BH |
621 | return 0; |
622 | } | |
623 | ||
a7f290da BH |
624 | static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, |
625 | struct lib64_elfinfo *v64) | |
626 | { | |
627 | int i; | |
628 | ||
629 | for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { | |
630 | struct vdso_patch_def *patch = &vdso_patches[i]; | |
631 | int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) | |
632 | == patch->ftr_value; | |
633 | if (!match) | |
634 | continue; | |
635 | ||
636 | DBG("replacing %s with %s...\n", patch->gen_name, | |
637 | patch->fix_name ? "NONE" : patch->fix_name); | |
638 | ||
639 | /* | |
640 | * Patch the 32 bits and 64 bits symbols. Note that we do not | |
641 | * patch the "." symbol on 64 bits. | |
642 | * It would be easy to do, but doesn't seem to be necessary, | |
643 | * patching the OPD symbol is enough. | |
644 | */ | |
645 | vdso_do_func_patch32(v32, v64, patch->gen_name, | |
646 | patch->fix_name); | |
647 | #ifdef CONFIG_PPC64 | |
648 | vdso_do_func_patch64(v32, v64, patch->gen_name, | |
649 | patch->fix_name); | |
650 | #endif /* CONFIG_PPC64 */ | |
651 | } | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | ||
657 | static __init int vdso_setup(void) | |
658 | { | |
659 | struct lib32_elfinfo v32; | |
660 | struct lib64_elfinfo v64; | |
661 | ||
662 | v32.hdr = vdso32_kbase; | |
663 | #ifdef CONFIG_PPC64 | |
664 | v64.hdr = vdso64_kbase; | |
665 | #endif | |
666 | if (vdso_do_find_sections(&v32, &v64)) | |
667 | return -1; | |
668 | ||
669 | if (vdso_fixup_datapage(&v32, &v64)) | |
670 | return -1; | |
671 | ||
0909c8c2 BH |
672 | if (vdso_fixup_features(&v32, &v64)) |
673 | return -1; | |
674 | ||
a7f290da BH |
675 | if (vdso_fixup_alt_funcs(&v32, &v64)) |
676 | return -1; | |
677 | ||
678 | vdso_setup_trampolines(&v32, &v64); | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
683 | /* | |
684 | * Called from setup_arch to initialize the bitmap of available | |
685 | * syscalls in the systemcfg page | |
686 | */ | |
687 | static void __init vdso_setup_syscall_map(void) | |
688 | { | |
689 | unsigned int i; | |
690 | extern unsigned long *sys_call_table; | |
691 | extern unsigned long sys_ni_syscall; | |
692 | ||
693 | ||
694 | for (i = 0; i < __NR_syscalls; i++) { | |
695 | #ifdef CONFIG_PPC64 | |
696 | if (sys_call_table[i*2] != sys_ni_syscall) | |
697 | vdso_data->syscall_map_64[i >> 5] |= | |
698 | 0x80000000UL >> (i & 0x1f); | |
699 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
700 | vdso_data->syscall_map_32[i >> 5] |= | |
701 | 0x80000000UL >> (i & 0x1f); | |
702 | #else /* CONFIG_PPC64 */ | |
703 | if (sys_call_table[i] != sys_ni_syscall) | |
704 | vdso_data->syscall_map_32[i >> 5] |= | |
705 | 0x80000000UL >> (i & 0x1f); | |
706 | #endif /* CONFIG_PPC64 */ | |
707 | } | |
708 | } | |
709 | ||
710 | ||
7ac9a137 | 711 | static int __init vdso_init(void) |
a7f290da BH |
712 | { |
713 | int i; | |
714 | ||
715 | #ifdef CONFIG_PPC64 | |
716 | /* | |
06fe9fb4 | 717 | * Fill up the "systemcfg" stuff for backward compatibility |
a7f290da | 718 | */ |
31fe5bf6 | 719 | strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); |
a7f290da BH |
720 | vdso_data->version.major = SYSTEMCFG_MAJOR; |
721 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
722 | vdso_data->processor = mfspr(SPRN_PVR); | |
e8222502 | 723 | /* |
1d9a4731 | 724 | * Fake the old platform number for pSeries and add |
e8222502 BH |
725 | * in LPAR bit if necessary |
726 | */ | |
1d9a4731 | 727 | vdso_data->platform = 0x100; |
e8222502 BH |
728 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
729 | vdso_data->platform |= 1; | |
95f72d1e | 730 | vdso_data->physicalMemorySize = memblock_phys_mem_size(); |
a7f290da BH |
731 | vdso_data->dcache_size = ppc64_caches.dsize; |
732 | vdso_data->dcache_line_size = ppc64_caches.dline_size; | |
733 | vdso_data->icache_size = ppc64_caches.isize; | |
734 | vdso_data->icache_line_size = ppc64_caches.iline_size; | |
735 | ||
fbe48175 OJ |
736 | /* XXXOJN: Blocks should be added to ppc64_caches and used instead */ |
737 | vdso_data->dcache_block_size = ppc64_caches.dline_size; | |
738 | vdso_data->icache_block_size = ppc64_caches.iline_size; | |
739 | vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size; | |
740 | vdso_data->icache_log_block_size = ppc64_caches.log_iline_size; | |
741 | ||
a7f290da BH |
742 | /* |
743 | * Calculate the size of the 64 bits vDSO | |
744 | */ | |
745 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
746 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
fbe48175 OJ |
747 | #else |
748 | vdso_data->dcache_block_size = L1_CACHE_BYTES; | |
749 | vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; | |
750 | vdso_data->icache_block_size = L1_CACHE_BYTES; | |
751 | vdso_data->icache_log_block_size = L1_CACHE_SHIFT; | |
a7f290da BH |
752 | #endif /* CONFIG_PPC64 */ |
753 | ||
754 | ||
755 | /* | |
756 | * Calculate the size of the 32 bits vDSO | |
757 | */ | |
758 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
759 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
760 | ||
761 | ||
762 | /* | |
763 | * Setup the syscall map in the vDOS | |
764 | */ | |
765 | vdso_setup_syscall_map(); | |
0909c8c2 | 766 | |
a7f290da BH |
767 | /* |
768 | * Initialize the vDSO images in memory, that is do necessary | |
769 | * fixups of vDSO symbols, locate trampolines, etc... | |
770 | */ | |
771 | if (vdso_setup()) { | |
772 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
773 | vdso32_pages = 0; | |
774 | #ifdef CONFIG_PPC64 | |
775 | vdso64_pages = 0; | |
776 | #endif | |
7ac9a137 | 777 | return 0; |
a7f290da BH |
778 | } |
779 | ||
780 | /* Make sure pages are in the correct state */ | |
7ac9a137 BH |
781 | vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2), |
782 | GFP_KERNEL); | |
783 | BUG_ON(vdso32_pagelist == NULL); | |
a7f290da BH |
784 | for (i = 0; i < vdso32_pages; i++) { |
785 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
786 | ClearPageReserved(pg); | |
787 | get_page(pg); | |
c13e4ca2 | 788 | vdso32_pagelist[i] = pg; |
a7f290da | 789 | } |
c13e4ca2 RM |
790 | vdso32_pagelist[i++] = virt_to_page(vdso_data); |
791 | vdso32_pagelist[i] = NULL; | |
792 | ||
a7f290da | 793 | #ifdef CONFIG_PPC64 |
7ac9a137 BH |
794 | vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2), |
795 | GFP_KERNEL); | |
796 | BUG_ON(vdso64_pagelist == NULL); | |
a7f290da BH |
797 | for (i = 0; i < vdso64_pages; i++) { |
798 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
799 | ClearPageReserved(pg); | |
800 | get_page(pg); | |
c13e4ca2 | 801 | vdso64_pagelist[i] = pg; |
a7f290da | 802 | } |
c13e4ca2 RM |
803 | vdso64_pagelist[i++] = virt_to_page(vdso_data); |
804 | vdso64_pagelist[i] = NULL; | |
a7f290da BH |
805 | #endif /* CONFIG_PPC64 */ |
806 | ||
807 | get_page(virt_to_page(vdso_data)); | |
7ac9a137 BH |
808 | |
809 | smp_wmb(); | |
810 | vdso_ready = 1; | |
811 | ||
812 | return 0; | |
a7f290da | 813 | } |
7ac9a137 | 814 | arch_initcall(vdso_init); |
a7f290da | 815 | |
cae5d390 | 816 | int in_gate_area_no_mm(unsigned long addr) |
a7f290da BH |
817 | { |
818 | return 0; | |
819 | } | |
820 | ||
83b964bb | 821 | int in_gate_area(struct mm_struct *mm, unsigned long addr) |
a7f290da BH |
822 | { |
823 | return 0; | |
824 | } | |
825 | ||
31db58b3 | 826 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
a7f290da BH |
827 | { |
828 | return NULL; | |
829 | } | |
830 |