]>
Commit | Line | Data |
---|---|---|
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> | |
95f72d1e | 23 | #include <linux/memblock.h> |
a7f290da | 24 | |
546c4402 | 25 | #include <asm/cpu_has_feature.h> |
a7f290da | 26 | #include <asm/pgtable.h> |
a7f290da BH |
27 | #include <asm/processor.h> |
28 | #include <asm/mmu.h> | |
29 | #include <asm/mmu_context.h> | |
d9b2b2a2 | 30 | #include <asm/prom.h> |
a7f290da BH |
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> | |
b88c4767 | 37 | #include <asm/setup.h> |
0909c8c2 | 38 | |
a7f290da BH |
39 | #undef DEBUG |
40 | ||
41 | #ifdef DEBUG | |
42 | #define DBG(fmt...) printk(fmt) | |
43 | #else | |
44 | #define DBG(fmt...) | |
45 | #endif | |
46 | ||
47 | /* Max supported size for symbol names */ | |
48 | #define MAX_SYMNAME 64 | |
49 | ||
348aa303 AS |
50 | /* The alignment of the vDSO */ |
51 | #define VDSO_ALIGNMENT (1 << 16) | |
52 | ||
7ac9a137 | 53 | static unsigned int vdso32_pages; |
e0d00591 | 54 | static void *vdso32_kbase; |
7ac9a137 | 55 | static struct page **vdso32_pagelist; |
a7f290da BH |
56 | unsigned long vdso32_sigtramp; |
57 | unsigned long vdso32_rt_sigtramp; | |
58 | ||
e0d00591 ME |
59 | #ifdef CONFIG_VDSO32 |
60 | extern char vdso32_start, vdso32_end; | |
61 | #endif | |
62 | ||
a7f290da BH |
63 | #ifdef CONFIG_PPC64 |
64 | extern char vdso64_start, vdso64_end; | |
65 | static void *vdso64_kbase = &vdso64_start; | |
7ac9a137 BH |
66 | static unsigned int vdso64_pages; |
67 | static struct page **vdso64_pagelist; | |
a7f290da BH |
68 | unsigned long vdso64_rt_sigtramp; |
69 | #endif /* CONFIG_PPC64 */ | |
70 | ||
7ac9a137 BH |
71 | static int vdso_ready; |
72 | ||
a7f290da BH |
73 | /* |
74 | * The vdso data page (aka. systemcfg for old ppc64 fans) is here. | |
75 | * Once the early boot kernel code no longer needs to muck around | |
76 | * with it, it will become dynamically allocated | |
77 | */ | |
78 | static union { | |
79 | struct vdso_data data; | |
80 | u8 page[PAGE_SIZE]; | |
abe1ee3a | 81 | } vdso_data_store __page_aligned_data; |
a7f290da BH |
82 | struct vdso_data *vdso_data = &vdso_data_store.data; |
83 | ||
84 | /* Format of the patch table */ | |
85 | struct vdso_patch_def | |
86 | { | |
87 | unsigned long ftr_mask, ftr_value; | |
88 | const char *gen_name; | |
89 | const char *fix_name; | |
90 | }; | |
91 | ||
92 | /* Table of functions to patch based on the CPU type/revision | |
93 | * | |
94 | * Currently, we only change sync_dicache to do nothing on processors | |
95 | * with a coherent icache | |
96 | */ | |
97 | static struct vdso_patch_def vdso_patches[] = { | |
98 | { | |
99 | CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE, | |
100 | "__kernel_sync_dicache", "__kernel_sync_dicache_p5" | |
101 | }, | |
c0d64cf9 | 102 | #ifdef CONFIG_PPC32 |
a7f290da | 103 | { |
c0d64cf9 | 104 | CPU_FTR_USE_RTC, CPU_FTR_USE_RTC, |
a7f290da BH |
105 | "__kernel_gettimeofday", NULL |
106 | }, | |
7b5acbaa | 107 | { |
c0d64cf9 | 108 | CPU_FTR_USE_RTC, CPU_FTR_USE_RTC, |
7b5acbaa BH |
109 | "__kernel_clock_gettime", NULL |
110 | }, | |
111 | { | |
c0d64cf9 | 112 | CPU_FTR_USE_RTC, CPU_FTR_USE_RTC, |
7b5acbaa BH |
113 | "__kernel_clock_getres", NULL |
114 | }, | |
115 | { | |
c0d64cf9 | 116 | CPU_FTR_USE_RTC, CPU_FTR_USE_RTC, |
7b5acbaa BH |
117 | "__kernel_get_tbfreq", NULL |
118 | }, | |
fcb41a20 | 119 | { |
c0d64cf9 | 120 | CPU_FTR_USE_RTC, CPU_FTR_USE_RTC, |
fcb41a20 AZ |
121 | "__kernel_time", NULL |
122 | }, | |
c0d64cf9 | 123 | #endif |
a7f290da BH |
124 | }; |
125 | ||
126 | /* | |
127 | * Some infos carried around for each of them during parsing at | |
128 | * boot time. | |
129 | */ | |
130 | struct lib32_elfinfo | |
131 | { | |
132 | Elf32_Ehdr *hdr; /* ptr to ELF */ | |
133 | Elf32_Sym *dynsym; /* ptr to .dynsym section */ | |
134 | unsigned long dynsymsize; /* size of .dynsym section */ | |
135 | char *dynstr; /* ptr to .dynstr section */ | |
136 | unsigned long text; /* offset of .text section in .so */ | |
137 | }; | |
138 | ||
139 | struct lib64_elfinfo | |
140 | { | |
141 | Elf64_Ehdr *hdr; | |
142 | Elf64_Sym *dynsym; | |
143 | unsigned long dynsymsize; | |
144 | char *dynstr; | |
145 | unsigned long text; | |
146 | }; | |
147 | ||
148 | ||
a7f290da BH |
149 | /* |
150 | * This is called from binfmt_elf, we create the special vma for the | |
151 | * vDSO and insert it into the mm struct tree | |
152 | */ | |
fc5243d9 | 153 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
a7f290da BH |
154 | { |
155 | struct mm_struct *mm = current->mm; | |
c13e4ca2 | 156 | struct page **vdso_pagelist; |
a7f290da BH |
157 | unsigned long vdso_pages; |
158 | unsigned long vdso_base; | |
a5bba930 | 159 | int rc; |
a7f290da | 160 | |
7ac9a137 BH |
161 | if (!vdso_ready) |
162 | return 0; | |
163 | ||
a7f290da | 164 | #ifdef CONFIG_PPC64 |
cab175f9 | 165 | if (is_32bit_task()) { |
c13e4ca2 | 166 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
167 | vdso_pages = vdso32_pages; |
168 | vdso_base = VDSO32_MBASE; | |
169 | } else { | |
c13e4ca2 | 170 | vdso_pagelist = vdso64_pagelist; |
a7f290da | 171 | vdso_pages = vdso64_pages; |
30d0b368 AB |
172 | /* |
173 | * On 64bit we don't have a preferred map address. This | |
174 | * allows get_unmapped_area to find an area near other mmaps | |
175 | * and most likely share a SLB entry. | |
176 | */ | |
177 | vdso_base = 0; | |
a7f290da BH |
178 | } |
179 | #else | |
c13e4ca2 | 180 | vdso_pagelist = vdso32_pagelist; |
a7f290da BH |
181 | vdso_pages = vdso32_pages; |
182 | vdso_base = VDSO32_MBASE; | |
183 | #endif | |
184 | ||
a5bba930 | 185 | current->mm->context.vdso_base = 0; |
a7f290da BH |
186 | |
187 | /* vDSO has a problem and was disabled, just don't "enable" it for the | |
188 | * process | |
189 | */ | |
190 | if (vdso_pages == 0) | |
191 | return 0; | |
a7f290da BH |
192 | /* Add a page to the vdso size for the data page */ |
193 | vdso_pages ++; | |
194 | ||
195 | /* | |
196 | * pick a base address for the vDSO in process space. We try to put it | |
197 | * at vdso_base which is the "natural" base for it, but we might fail | |
198 | * and end up putting it elsewhere. | |
348aa303 | 199 | * Add enough to the size so that the result can be aligned. |
a7f290da | 200 | */ |
69048176 MH |
201 | if (down_write_killable(&mm->mmap_sem)) |
202 | return -EINTR; | |
a7f290da | 203 | vdso_base = get_unmapped_area(NULL, vdso_base, |
348aa303 AS |
204 | (vdso_pages << PAGE_SHIFT) + |
205 | ((VDSO_ALIGNMENT - 1) & PAGE_MASK), | |
206 | 0, 0); | |
a5bba930 BH |
207 | if (IS_ERR_VALUE(vdso_base)) { |
208 | rc = vdso_base; | |
209 | goto fail_mmapsem; | |
a7f290da BH |
210 | } |
211 | ||
348aa303 AS |
212 | /* Add required alignment. */ |
213 | vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT); | |
214 | ||
f2053f1a AB |
215 | /* |
216 | * Put vDSO base into mm struct. We need to do this before calling | |
217 | * install_special_mapping or the perf counter mmap tracking code | |
218 | * will fail to recognise it as a vDSO (since arch_vma_name fails). | |
219 | */ | |
220 | current->mm->context.vdso_base = vdso_base; | |
221 | ||
a7f290da BH |
222 | /* |
223 | * our vma flags don't have VM_WRITE so by default, the process isn't | |
224 | * allowed to write those pages. | |
225 | * gdb can break that with ptrace interface, and thus trigger COW on | |
226 | * those pages but it's then your responsibility to never do that on | |
227 | * the "data" page of the vDSO or you'll stop getting kernel updates | |
228 | * and your nice userland gettimeofday will be totally dead. | |
229 | * It's fine to use that for setting breakpoints in the vDSO code | |
909af768 | 230 | * pages though. |
3a0cfadb | 231 | */ |
c13e4ca2 RM |
232 | rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, |
233 | VM_READ|VM_EXEC| | |
909af768 | 234 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, |
c13e4ca2 | 235 | vdso_pagelist); |
f2053f1a AB |
236 | if (rc) { |
237 | current->mm->context.vdso_base = 0; | |
c13e4ca2 | 238 | goto fail_mmapsem; |
f2053f1a | 239 | } |
c13e4ca2 | 240 | |
a7f290da | 241 | up_write(&mm->mmap_sem); |
a7f290da | 242 | return 0; |
a5bba930 | 243 | |
a5bba930 BH |
244 | fail_mmapsem: |
245 | up_write(&mm->mmap_sem); | |
246 | return rc; | |
247 | } | |
248 | ||
249 | const char *arch_vma_name(struct vm_area_struct *vma) | |
250 | { | |
251 | if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) | |
252 | return "[vdso]"; | |
253 | return NULL; | |
a7f290da BH |
254 | } |
255 | ||
a5bba930 BH |
256 | |
257 | ||
e0d00591 | 258 | #ifdef CONFIG_VDSO32 |
a7f290da BH |
259 | static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname, |
260 | unsigned long *size) | |
261 | { | |
262 | Elf32_Shdr *sechdrs; | |
263 | unsigned int i; | |
264 | char *secnames; | |
265 | ||
266 | /* Grab section headers and strings so we can tell who is who */ | |
267 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
268 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
269 | ||
270 | /* Find the section they want */ | |
271 | for (i = 1; i < ehdr->e_shnum; i++) { | |
272 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
273 | if (size) | |
274 | *size = sechdrs[i].sh_size; | |
275 | return (void *)ehdr + sechdrs[i].sh_offset; | |
276 | } | |
277 | } | |
278 | *size = 0; | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib, | |
283 | const char *symname) | |
284 | { | |
285 | unsigned int i; | |
286 | char name[MAX_SYMNAME], *c; | |
287 | ||
288 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) { | |
289 | if (lib->dynsym[i].st_name == 0) | |
290 | continue; | |
291 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
292 | MAX_SYMNAME); | |
293 | c = strchr(name, '@'); | |
294 | if (c) | |
295 | *c = 0; | |
296 | if (strcmp(symname, name) == 0) | |
297 | return &lib->dynsym[i]; | |
298 | } | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | /* Note that we assume the section is .text and the symbol is relative to | |
303 | * the library base | |
304 | */ | |
305 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
306 | const char *symname) | |
307 | { | |
308 | Elf32_Sym *sym = find_symbol32(lib, symname); | |
309 | ||
310 | if (sym == NULL) { | |
311 | printk(KERN_WARNING "vDSO32: function %s not found !\n", | |
312 | symname); | |
313 | return 0; | |
314 | } | |
315 | return sym->st_value - VDSO32_LBASE; | |
316 | } | |
317 | ||
cf8918fe AB |
318 | static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, |
319 | struct lib64_elfinfo *v64, | |
320 | const char *orig, const char *fix) | |
a7f290da BH |
321 | { |
322 | Elf32_Sym *sym32_gen, *sym32_fix; | |
323 | ||
324 | sym32_gen = find_symbol32(v32, orig); | |
325 | if (sym32_gen == NULL) { | |
326 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig); | |
327 | return -1; | |
328 | } | |
329 | if (fix == NULL) { | |
330 | sym32_gen->st_name = 0; | |
331 | return 0; | |
332 | } | |
333 | sym32_fix = find_symbol32(v32, fix); | |
334 | if (sym32_fix == NULL) { | |
335 | printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix); | |
336 | return -1; | |
337 | } | |
338 | sym32_gen->st_value = sym32_fix->st_value; | |
339 | sym32_gen->st_size = sym32_fix->st_size; | |
340 | sym32_gen->st_info = sym32_fix->st_info; | |
341 | sym32_gen->st_other = sym32_fix->st_other; | |
342 | sym32_gen->st_shndx = sym32_fix->st_shndx; | |
343 | ||
344 | return 0; | |
345 | } | |
e0d00591 ME |
346 | #else /* !CONFIG_VDSO32 */ |
347 | static unsigned long __init find_function32(struct lib32_elfinfo *lib, | |
348 | const char *symname) | |
349 | { | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32, | |
354 | struct lib64_elfinfo *v64, | |
355 | const char *orig, const char *fix) | |
356 | { | |
357 | return 0; | |
358 | } | |
359 | #endif /* CONFIG_VDSO32 */ | |
a7f290da BH |
360 | |
361 | ||
362 | #ifdef CONFIG_PPC64 | |
363 | ||
364 | static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname, | |
365 | unsigned long *size) | |
366 | { | |
367 | Elf64_Shdr *sechdrs; | |
368 | unsigned int i; | |
369 | char *secnames; | |
370 | ||
371 | /* Grab section headers and strings so we can tell who is who */ | |
372 | sechdrs = (void *)ehdr + ehdr->e_shoff; | |
373 | secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset; | |
374 | ||
375 | /* Find the section they want */ | |
376 | for (i = 1; i < ehdr->e_shnum; i++) { | |
377 | if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) { | |
378 | if (size) | |
379 | *size = sechdrs[i].sh_size; | |
380 | return (void *)ehdr + sechdrs[i].sh_offset; | |
381 | } | |
382 | } | |
383 | if (size) | |
384 | *size = 0; | |
385 | return NULL; | |
386 | } | |
387 | ||
388 | static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib, | |
389 | const char *symname) | |
390 | { | |
391 | unsigned int i; | |
392 | char name[MAX_SYMNAME], *c; | |
393 | ||
394 | for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) { | |
395 | if (lib->dynsym[i].st_name == 0) | |
396 | continue; | |
397 | strlcpy(name, lib->dynstr + lib->dynsym[i].st_name, | |
398 | MAX_SYMNAME); | |
399 | c = strchr(name, '@'); | |
400 | if (c) | |
401 | *c = 0; | |
402 | if (strcmp(symname, name) == 0) | |
403 | return &lib->dynsym[i]; | |
404 | } | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | /* Note that we assume the section is .text and the symbol is relative to | |
409 | * the library base | |
410 | */ | |
411 | static unsigned long __init find_function64(struct lib64_elfinfo *lib, | |
412 | const char *symname) | |
413 | { | |
414 | Elf64_Sym *sym = find_symbol64(lib, symname); | |
415 | ||
416 | if (sym == NULL) { | |
417 | printk(KERN_WARNING "vDSO64: function %s not found !\n", | |
418 | symname); | |
419 | return 0; | |
420 | } | |
421 | #ifdef VDS64_HAS_DESCRIPTORS | |
422 | return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) - | |
423 | VDSO64_LBASE; | |
424 | #else | |
425 | return sym->st_value - VDSO64_LBASE; | |
426 | #endif | |
427 | } | |
428 | ||
cf8918fe AB |
429 | static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32, |
430 | struct lib64_elfinfo *v64, | |
431 | const char *orig, const char *fix) | |
a7f290da BH |
432 | { |
433 | Elf64_Sym *sym64_gen, *sym64_fix; | |
434 | ||
435 | sym64_gen = find_symbol64(v64, orig); | |
436 | if (sym64_gen == NULL) { | |
437 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig); | |
438 | return -1; | |
439 | } | |
440 | if (fix == NULL) { | |
441 | sym64_gen->st_name = 0; | |
442 | return 0; | |
443 | } | |
444 | sym64_fix = find_symbol64(v64, fix); | |
445 | if (sym64_fix == NULL) { | |
446 | printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix); | |
447 | return -1; | |
448 | } | |
449 | sym64_gen->st_value = sym64_fix->st_value; | |
450 | sym64_gen->st_size = sym64_fix->st_size; | |
451 | sym64_gen->st_info = sym64_fix->st_info; | |
452 | sym64_gen->st_other = sym64_fix->st_other; | |
453 | sym64_gen->st_shndx = sym64_fix->st_shndx; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | #endif /* CONFIG_PPC64 */ | |
459 | ||
460 | ||
461 | static __init int vdso_do_find_sections(struct lib32_elfinfo *v32, | |
462 | struct lib64_elfinfo *v64) | |
463 | { | |
464 | void *sect; | |
465 | ||
466 | /* | |
467 | * Locate symbol tables & text section | |
468 | */ | |
469 | ||
e0d00591 | 470 | #ifdef CONFIG_VDSO32 |
a7f290da BH |
471 | v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize); |
472 | v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL); | |
473 | if (v32->dynsym == NULL || v32->dynstr == NULL) { | |
474 | printk(KERN_ERR "vDSO32: required symbol section not found\n"); | |
475 | return -1; | |
476 | } | |
477 | sect = find_section32(v32->hdr, ".text", NULL); | |
478 | if (sect == NULL) { | |
479 | printk(KERN_ERR "vDSO32: the .text section was not found\n"); | |
480 | return -1; | |
481 | } | |
482 | v32->text = sect - vdso32_kbase; | |
e0d00591 | 483 | #endif |
a7f290da BH |
484 | |
485 | #ifdef CONFIG_PPC64 | |
486 | v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize); | |
487 | v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL); | |
488 | if (v64->dynsym == NULL || v64->dynstr == NULL) { | |
489 | printk(KERN_ERR "vDSO64: required symbol section not found\n"); | |
490 | return -1; | |
491 | } | |
492 | sect = find_section64(v64->hdr, ".text", NULL); | |
493 | if (sect == NULL) { | |
494 | printk(KERN_ERR "vDSO64: the .text section was not found\n"); | |
495 | return -1; | |
496 | } | |
497 | v64->text = sect - vdso64_kbase; | |
498 | #endif /* CONFIG_PPC64 */ | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32, | |
504 | struct lib64_elfinfo *v64) | |
505 | { | |
506 | /* | |
507 | * Find signal trampolines | |
508 | */ | |
509 | ||
510 | #ifdef CONFIG_PPC64 | |
511 | vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64"); | |
512 | #endif | |
513 | vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32"); | |
514 | vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32"); | |
515 | } | |
516 | ||
517 | static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32, | |
518 | struct lib64_elfinfo *v64) | |
519 | { | |
e0d00591 | 520 | #ifdef CONFIG_VDSO32 |
a7f290da | 521 | Elf32_Sym *sym32; |
e0d00591 | 522 | #endif |
a7f290da BH |
523 | #ifdef CONFIG_PPC64 |
524 | Elf64_Sym *sym64; | |
525 | ||
526 | sym64 = find_symbol64(v64, "__kernel_datapage_offset"); | |
527 | if (sym64 == NULL) { | |
528 | printk(KERN_ERR "vDSO64: Can't find symbol " | |
529 | "__kernel_datapage_offset !\n"); | |
530 | return -1; | |
531 | } | |
532 | *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) = | |
533 | (vdso64_pages << PAGE_SHIFT) - | |
534 | (sym64->st_value - VDSO64_LBASE); | |
535 | #endif /* CONFIG_PPC64 */ | |
536 | ||
e0d00591 | 537 | #ifdef CONFIG_VDSO32 |
a7f290da BH |
538 | sym32 = find_symbol32(v32, "__kernel_datapage_offset"); |
539 | if (sym32 == NULL) { | |
540 | printk(KERN_ERR "vDSO32: Can't find symbol " | |
541 | "__kernel_datapage_offset !\n"); | |
542 | return -1; | |
543 | } | |
544 | *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) = | |
545 | (vdso32_pages << PAGE_SHIFT) - | |
546 | (sym32->st_value - VDSO32_LBASE); | |
e0d00591 | 547 | #endif |
a7f290da BH |
548 | |
549 | return 0; | |
550 | } | |
551 | ||
0909c8c2 BH |
552 | |
553 | static __init int vdso_fixup_features(struct lib32_elfinfo *v32, | |
554 | struct lib64_elfinfo *v64) | |
555 | { | |
6e5c0775 ME |
556 | unsigned long size; |
557 | void *start; | |
0909c8c2 BH |
558 | |
559 | #ifdef CONFIG_PPC64 | |
6e5c0775 ME |
560 | start = find_section64(v64->hdr, "__ftr_fixup", &size); |
561 | if (start) | |
0909c8c2 | 562 | do_feature_fixups(cur_cpu_spec->cpu_features, |
6e5c0775 | 563 | start, start + size); |
0909c8c2 | 564 | |
6e5c0775 ME |
565 | start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size); |
566 | if (start) | |
7c03d653 | 567 | do_feature_fixups(cur_cpu_spec->mmu_features, |
6e5c0775 | 568 | start, start + size); |
7c03d653 | 569 | |
6e5c0775 ME |
570 | start = find_section64(v64->hdr, "__fw_ftr_fixup", &size); |
571 | if (start) | |
0909c8c2 | 572 | do_feature_fixups(powerpc_firmware_features, |
6e5c0775 | 573 | start, start + size); |
2d1b2027 | 574 | |
6e5c0775 ME |
575 | start = find_section64(v64->hdr, "__lwsync_fixup", &size); |
576 | if (start) | |
2d1b2027 | 577 | do_lwsync_fixups(cur_cpu_spec->cpu_features, |
6e5c0775 | 578 | start, start + size); |
0909c8c2 BH |
579 | #endif /* CONFIG_PPC64 */ |
580 | ||
e0d00591 | 581 | #ifdef CONFIG_VDSO32 |
6e5c0775 ME |
582 | start = find_section32(v32->hdr, "__ftr_fixup", &size); |
583 | if (start) | |
0909c8c2 | 584 | do_feature_fixups(cur_cpu_spec->cpu_features, |
6e5c0775 | 585 | start, start + size); |
0909c8c2 | 586 | |
6e5c0775 ME |
587 | start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size); |
588 | if (start) | |
7c03d653 | 589 | do_feature_fixups(cur_cpu_spec->mmu_features, |
6e5c0775 | 590 | start, start + size); |
7c03d653 | 591 | |
0909c8c2 | 592 | #ifdef CONFIG_PPC64 |
6e5c0775 ME |
593 | start = find_section32(v32->hdr, "__fw_ftr_fixup", &size); |
594 | if (start) | |
0909c8c2 | 595 | do_feature_fixups(powerpc_firmware_features, |
6e5c0775 | 596 | start, start + size); |
0909c8c2 BH |
597 | #endif /* CONFIG_PPC64 */ |
598 | ||
6e5c0775 ME |
599 | start = find_section32(v32->hdr, "__lwsync_fixup", &size); |
600 | if (start) | |
2d1b2027 | 601 | do_lwsync_fixups(cur_cpu_spec->cpu_features, |
6e5c0775 | 602 | start, start + size); |
e0d00591 | 603 | #endif |
2d1b2027 | 604 | |
0909c8c2 BH |
605 | return 0; |
606 | } | |
607 | ||
a7f290da BH |
608 | static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32, |
609 | struct lib64_elfinfo *v64) | |
610 | { | |
611 | int i; | |
612 | ||
613 | for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) { | |
614 | struct vdso_patch_def *patch = &vdso_patches[i]; | |
615 | int match = (cur_cpu_spec->cpu_features & patch->ftr_mask) | |
616 | == patch->ftr_value; | |
617 | if (!match) | |
618 | continue; | |
619 | ||
620 | DBG("replacing %s with %s...\n", patch->gen_name, | |
621 | patch->fix_name ? "NONE" : patch->fix_name); | |
622 | ||
623 | /* | |
624 | * Patch the 32 bits and 64 bits symbols. Note that we do not | |
625 | * patch the "." symbol on 64 bits. | |
626 | * It would be easy to do, but doesn't seem to be necessary, | |
627 | * patching the OPD symbol is enough. | |
628 | */ | |
629 | vdso_do_func_patch32(v32, v64, patch->gen_name, | |
630 | patch->fix_name); | |
631 | #ifdef CONFIG_PPC64 | |
632 | vdso_do_func_patch64(v32, v64, patch->gen_name, | |
633 | patch->fix_name); | |
634 | #endif /* CONFIG_PPC64 */ | |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | ||
641 | static __init int vdso_setup(void) | |
642 | { | |
643 | struct lib32_elfinfo v32; | |
644 | struct lib64_elfinfo v64; | |
645 | ||
646 | v32.hdr = vdso32_kbase; | |
647 | #ifdef CONFIG_PPC64 | |
648 | v64.hdr = vdso64_kbase; | |
649 | #endif | |
650 | if (vdso_do_find_sections(&v32, &v64)) | |
651 | return -1; | |
652 | ||
653 | if (vdso_fixup_datapage(&v32, &v64)) | |
654 | return -1; | |
655 | ||
0909c8c2 BH |
656 | if (vdso_fixup_features(&v32, &v64)) |
657 | return -1; | |
658 | ||
a7f290da BH |
659 | if (vdso_fixup_alt_funcs(&v32, &v64)) |
660 | return -1; | |
661 | ||
662 | vdso_setup_trampolines(&v32, &v64); | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Called from setup_arch to initialize the bitmap of available | |
669 | * syscalls in the systemcfg page | |
670 | */ | |
671 | static void __init vdso_setup_syscall_map(void) | |
672 | { | |
673 | unsigned int i; | |
674 | extern unsigned long *sys_call_table; | |
675 | extern unsigned long sys_ni_syscall; | |
676 | ||
677 | ||
f43194e4 | 678 | for (i = 0; i < NR_syscalls; i++) { |
a7f290da BH |
679 | #ifdef CONFIG_PPC64 |
680 | if (sys_call_table[i*2] != sys_ni_syscall) | |
681 | vdso_data->syscall_map_64[i >> 5] |= | |
682 | 0x80000000UL >> (i & 0x1f); | |
683 | if (sys_call_table[i*2+1] != sys_ni_syscall) | |
684 | vdso_data->syscall_map_32[i >> 5] |= | |
685 | 0x80000000UL >> (i & 0x1f); | |
686 | #else /* CONFIG_PPC64 */ | |
687 | if (sys_call_table[i] != sys_ni_syscall) | |
688 | vdso_data->syscall_map_32[i >> 5] |= | |
689 | 0x80000000UL >> (i & 0x1f); | |
690 | #endif /* CONFIG_PPC64 */ | |
691 | } | |
692 | } | |
693 | ||
18ad51dd | 694 | #ifdef CONFIG_PPC64 |
061d19f2 | 695 | int vdso_getcpu_init(void) |
18ad51dd AB |
696 | { |
697 | unsigned long cpu, node, val; | |
698 | ||
699 | /* | |
9d378dfa SW |
700 | * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node |
701 | * in the next 16 bits. The VDSO uses this to implement getcpu(). | |
18ad51dd AB |
702 | */ |
703 | cpu = get_cpu(); | |
704 | WARN_ON_ONCE(cpu > 0xffff); | |
705 | ||
706 | node = cpu_to_node(cpu); | |
707 | WARN_ON_ONCE(node > 0xffff); | |
708 | ||
709 | val = (cpu & 0xfff) | ((node & 0xffff) << 16); | |
9d378dfa SW |
710 | mtspr(SPRN_SPRG_VDSO_WRITE, val); |
711 | get_paca()->sprg_vdso = val; | |
18ad51dd AB |
712 | |
713 | put_cpu(); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | /* We need to call this before SMP init */ | |
718 | early_initcall(vdso_getcpu_init); | |
719 | #endif | |
a7f290da | 720 | |
7ac9a137 | 721 | static int __init vdso_init(void) |
a7f290da BH |
722 | { |
723 | int i; | |
724 | ||
725 | #ifdef CONFIG_PPC64 | |
726 | /* | |
06fe9fb4 | 727 | * Fill up the "systemcfg" stuff for backward compatibility |
a7f290da | 728 | */ |
31fe5bf6 | 729 | strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64"); |
a7f290da BH |
730 | vdso_data->version.major = SYSTEMCFG_MAJOR; |
731 | vdso_data->version.minor = SYSTEMCFG_MINOR; | |
732 | vdso_data->processor = mfspr(SPRN_PVR); | |
e8222502 | 733 | /* |
1d9a4731 | 734 | * Fake the old platform number for pSeries and add |
e8222502 BH |
735 | * in LPAR bit if necessary |
736 | */ | |
1d9a4731 | 737 | vdso_data->platform = 0x100; |
e8222502 BH |
738 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
739 | vdso_data->platform |= 1; | |
95f72d1e | 740 | vdso_data->physicalMemorySize = memblock_phys_mem_size(); |
e2827fe5 BH |
741 | vdso_data->dcache_size = ppc64_caches.l1d.size; |
742 | vdso_data->dcache_line_size = ppc64_caches.l1d.line_size; | |
743 | vdso_data->icache_size = ppc64_caches.l1i.size; | |
744 | vdso_data->icache_line_size = ppc64_caches.l1i.line_size; | |
745 | vdso_data->dcache_block_size = ppc64_caches.l1d.block_size; | |
746 | vdso_data->icache_block_size = ppc64_caches.l1i.block_size; | |
747 | vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size; | |
748 | vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size; | |
fbe48175 | 749 | |
a7f290da BH |
750 | /* |
751 | * Calculate the size of the 64 bits vDSO | |
752 | */ | |
753 | vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT; | |
754 | DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages); | |
fbe48175 OJ |
755 | #else |
756 | vdso_data->dcache_block_size = L1_CACHE_BYTES; | |
757 | vdso_data->dcache_log_block_size = L1_CACHE_SHIFT; | |
758 | vdso_data->icache_block_size = L1_CACHE_BYTES; | |
759 | vdso_data->icache_log_block_size = L1_CACHE_SHIFT; | |
a7f290da BH |
760 | #endif /* CONFIG_PPC64 */ |
761 | ||
762 | ||
e0d00591 ME |
763 | #ifdef CONFIG_VDSO32 |
764 | vdso32_kbase = &vdso32_start; | |
765 | ||
a7f290da BH |
766 | /* |
767 | * Calculate the size of the 32 bits vDSO | |
768 | */ | |
769 | vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT; | |
770 | DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages); | |
e0d00591 | 771 | #endif |
a7f290da BH |
772 | |
773 | ||
774 | /* | |
775 | * Setup the syscall map in the vDOS | |
776 | */ | |
777 | vdso_setup_syscall_map(); | |
0909c8c2 | 778 | |
a7f290da BH |
779 | /* |
780 | * Initialize the vDSO images in memory, that is do necessary | |
781 | * fixups of vDSO symbols, locate trampolines, etc... | |
782 | */ | |
783 | if (vdso_setup()) { | |
784 | printk(KERN_ERR "vDSO setup failure, not enabled !\n"); | |
785 | vdso32_pages = 0; | |
786 | #ifdef CONFIG_PPC64 | |
787 | vdso64_pages = 0; | |
788 | #endif | |
7ac9a137 | 789 | return 0; |
a7f290da BH |
790 | } |
791 | ||
e0d00591 | 792 | #ifdef CONFIG_VDSO32 |
a7f290da | 793 | /* Make sure pages are in the correct state */ |
6396bb22 | 794 | vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *), |
7ac9a137 BH |
795 | GFP_KERNEL); |
796 | BUG_ON(vdso32_pagelist == NULL); | |
a7f290da BH |
797 | for (i = 0; i < vdso32_pages; i++) { |
798 | struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); | |
799 | ClearPageReserved(pg); | |
800 | get_page(pg); | |
c13e4ca2 | 801 | vdso32_pagelist[i] = pg; |
a7f290da | 802 | } |
c13e4ca2 RM |
803 | vdso32_pagelist[i++] = virt_to_page(vdso_data); |
804 | vdso32_pagelist[i] = NULL; | |
e0d00591 | 805 | #endif |
c13e4ca2 | 806 | |
a7f290da | 807 | #ifdef CONFIG_PPC64 |
6396bb22 | 808 | vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *), |
7ac9a137 BH |
809 | GFP_KERNEL); |
810 | BUG_ON(vdso64_pagelist == NULL); | |
a7f290da BH |
811 | for (i = 0; i < vdso64_pages; i++) { |
812 | struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); | |
813 | ClearPageReserved(pg); | |
814 | get_page(pg); | |
c13e4ca2 | 815 | vdso64_pagelist[i] = pg; |
a7f290da | 816 | } |
c13e4ca2 RM |
817 | vdso64_pagelist[i++] = virt_to_page(vdso_data); |
818 | vdso64_pagelist[i] = NULL; | |
a7f290da BH |
819 | #endif /* CONFIG_PPC64 */ |
820 | ||
821 | get_page(virt_to_page(vdso_data)); | |
7ac9a137 BH |
822 | |
823 | smp_wmb(); | |
824 | vdso_ready = 1; | |
825 | ||
826 | return 0; | |
a7f290da | 827 | } |
7ac9a137 | 828 | arch_initcall(vdso_init); |