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1da177e4 LT |
1 | /* By Ross Biro 1/23/92 */ |
2 | /* | |
3 | * Pentium III FXSR, SSE support | |
4 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
eee3af4a MM |
5 | * |
6 | * BTS tracing | |
7 | * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/ptrace.h> | |
91e7b707 | 16 | #include <linux/regset.h> |
1da177e4 | 17 | #include <linux/user.h> |
070459d9 | 18 | #include <linux/elf.h> |
1da177e4 LT |
19 | #include <linux/security.h> |
20 | #include <linux/audit.h> | |
21 | #include <linux/seccomp.h> | |
7ed20e1a | 22 | #include <linux/signal.h> |
1da177e4 LT |
23 | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/pgtable.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/processor.h> | |
28 | #include <asm/i387.h> | |
29 | #include <asm/debugreg.h> | |
30 | #include <asm/ldt.h> | |
31 | #include <asm/desc.h> | |
2047b08b RM |
32 | #include <asm/prctl.h> |
33 | #include <asm/proto.h> | |
eee3af4a MM |
34 | #include <asm/ds.h> |
35 | ||
070459d9 RM |
36 | #include "tls.h" |
37 | ||
38 | enum x86_regset { | |
39 | REGSET_GENERAL, | |
40 | REGSET_FP, | |
41 | REGSET_XFP, | |
42 | REGSET_TLS, | |
43 | }; | |
eee3af4a | 44 | |
1da177e4 LT |
45 | /* |
46 | * does not yet catch signals sent when the child dies. | |
47 | * in exit.c or in signal.c. | |
48 | */ | |
49 | ||
9f155b98 CE |
50 | /* |
51 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 52 | */ |
e39c2891 RM |
53 | #define FLAG_MASK_32 ((unsigned long) \ |
54 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
55 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
56 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
57 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
58 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
59 | ||
2047b08b RM |
60 | /* |
61 | * Determines whether a value may be installed in a segment register. | |
62 | */ | |
63 | static inline bool invalid_selector(u16 value) | |
64 | { | |
65 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
66 | } | |
67 | ||
68 | #ifdef CONFIG_X86_32 | |
69 | ||
e39c2891 | 70 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 71 | |
62a97d44 | 72 | static long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 73 | { |
65ea5b03 | 74 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
06ee1b68 | 75 | regno >>= 2; |
62a97d44 RM |
76 | if (regno > FS) |
77 | --regno; | |
65ea5b03 | 78 | return ®s->bx + regno; |
1da177e4 LT |
79 | } |
80 | ||
06ee1b68 | 81 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 82 | { |
06ee1b68 RM |
83 | /* |
84 | * Returning the value truncates it to 16 bits. | |
85 | */ | |
86 | unsigned int retval; | |
87 | if (offset != offsetof(struct user_regs_struct, gs)) | |
88 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
89 | else { | |
90 | retval = task->thread.gs; | |
91 | if (task == current) | |
92 | savesegment(gs, retval); | |
93 | } | |
94 | return retval; | |
95 | } | |
96 | ||
97 | static int set_segment_reg(struct task_struct *task, | |
98 | unsigned long offset, u16 value) | |
99 | { | |
100 | /* | |
101 | * The value argument was already truncated to 16 bits. | |
102 | */ | |
2047b08b | 103 | if (invalid_selector(value)) |
06ee1b68 RM |
104 | return -EIO; |
105 | ||
c63855d0 RM |
106 | /* |
107 | * For %cs and %ss we cannot permit a null selector. | |
108 | * We can permit a bogus selector as long as it has USER_RPL. | |
109 | * Null selectors are fine for other segment registers, but | |
110 | * we will never get back to user mode with invalid %cs or %ss | |
111 | * and will take the trap in iret instead. Much code relies | |
112 | * on user_mode() to distinguish a user trap frame (which can | |
113 | * safely use invalid selectors) from a kernel trap frame. | |
114 | */ | |
115 | switch (offset) { | |
116 | case offsetof(struct user_regs_struct, cs): | |
117 | case offsetof(struct user_regs_struct, ss): | |
118 | if (unlikely(value == 0)) | |
119 | return -EIO; | |
120 | ||
121 | default: | |
06ee1b68 | 122 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
123 | break; |
124 | ||
125 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 RM |
126 | task->thread.gs = value; |
127 | if (task == current) | |
5fd4d16b RM |
128 | /* |
129 | * The user-mode %gs is not affected by | |
130 | * kernel entry, so we must update the CPU. | |
131 | */ | |
132 | loadsegment(gs, value); | |
1da177e4 | 133 | } |
06ee1b68 | 134 | |
1da177e4 LT |
135 | return 0; |
136 | } | |
137 | ||
2047b08b RM |
138 | static unsigned long debugreg_addr_limit(struct task_struct *task) |
139 | { | |
140 | return TASK_SIZE - 3; | |
141 | } | |
142 | ||
143 | #else /* CONFIG_X86_64 */ | |
144 | ||
145 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
146 | ||
147 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
148 | { | |
149 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
150 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
151 | } | |
152 | ||
153 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
154 | { | |
155 | /* | |
156 | * Returning the value truncates it to 16 bits. | |
157 | */ | |
158 | unsigned int seg; | |
159 | ||
160 | switch (offset) { | |
161 | case offsetof(struct user_regs_struct, fs): | |
162 | if (task == current) { | |
163 | /* Older gas can't assemble movq %?s,%r?? */ | |
164 | asm("movl %%fs,%0" : "=r" (seg)); | |
165 | return seg; | |
166 | } | |
167 | return task->thread.fsindex; | |
168 | case offsetof(struct user_regs_struct, gs): | |
169 | if (task == current) { | |
170 | asm("movl %%gs,%0" : "=r" (seg)); | |
171 | return seg; | |
172 | } | |
173 | return task->thread.gsindex; | |
174 | case offsetof(struct user_regs_struct, ds): | |
175 | if (task == current) { | |
176 | asm("movl %%ds,%0" : "=r" (seg)); | |
177 | return seg; | |
178 | } | |
179 | return task->thread.ds; | |
180 | case offsetof(struct user_regs_struct, es): | |
181 | if (task == current) { | |
182 | asm("movl %%es,%0" : "=r" (seg)); | |
183 | return seg; | |
184 | } | |
185 | return task->thread.es; | |
186 | ||
187 | case offsetof(struct user_regs_struct, cs): | |
188 | case offsetof(struct user_regs_struct, ss): | |
189 | break; | |
190 | } | |
191 | return *pt_regs_access(task_pt_regs(task), offset); | |
192 | } | |
193 | ||
194 | static int set_segment_reg(struct task_struct *task, | |
195 | unsigned long offset, u16 value) | |
196 | { | |
197 | /* | |
198 | * The value argument was already truncated to 16 bits. | |
199 | */ | |
200 | if (invalid_selector(value)) | |
201 | return -EIO; | |
202 | ||
203 | switch (offset) { | |
204 | case offsetof(struct user_regs_struct,fs): | |
205 | /* | |
206 | * If this is setting fs as for normal 64-bit use but | |
207 | * setting fs_base has implicitly changed it, leave it. | |
208 | */ | |
209 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
210 | task->thread.fs != 0) || | |
211 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
212 | task->thread.fs == 0)) | |
213 | break; | |
214 | task->thread.fsindex = value; | |
215 | if (task == current) | |
216 | loadsegment(fs, task->thread.fsindex); | |
217 | break; | |
218 | case offsetof(struct user_regs_struct,gs): | |
219 | /* | |
220 | * If this is setting gs as for normal 64-bit use but | |
221 | * setting gs_base has implicitly changed it, leave it. | |
222 | */ | |
223 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
224 | task->thread.gs != 0) || | |
225 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
226 | task->thread.gs == 0)) | |
227 | break; | |
228 | task->thread.gsindex = value; | |
229 | if (task == current) | |
230 | load_gs_index(task->thread.gsindex); | |
231 | break; | |
232 | case offsetof(struct user_regs_struct,ds): | |
233 | task->thread.ds = value; | |
234 | if (task == current) | |
235 | loadsegment(ds, task->thread.ds); | |
236 | break; | |
237 | case offsetof(struct user_regs_struct,es): | |
238 | task->thread.es = value; | |
239 | if (task == current) | |
240 | loadsegment(es, task->thread.es); | |
241 | break; | |
242 | ||
243 | /* | |
244 | * Can't actually change these in 64-bit mode. | |
245 | */ | |
246 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
247 | if (unlikely(value == 0)) |
248 | return -EIO; | |
2047b08b RM |
249 | #ifdef CONFIG_IA32_EMULATION |
250 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
251 | task_pt_regs(task)->cs = value; | |
2047b08b | 252 | #endif |
cb757c41 | 253 | break; |
2047b08b | 254 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
255 | if (unlikely(value == 0)) |
256 | return -EIO; | |
2047b08b RM |
257 | #ifdef CONFIG_IA32_EMULATION |
258 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
259 | task_pt_regs(task)->ss = value; | |
2047b08b | 260 | #endif |
cb757c41 | 261 | break; |
2047b08b RM |
262 | } |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static unsigned long debugreg_addr_limit(struct task_struct *task) | |
268 | { | |
269 | #ifdef CONFIG_IA32_EMULATION | |
270 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
271 | return IA32_PAGE_OFFSET - 3; | |
272 | #endif | |
273 | return TASK_SIZE64 - 7; | |
274 | } | |
275 | ||
276 | #endif /* CONFIG_X86_32 */ | |
277 | ||
06ee1b68 | 278 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 279 | { |
06ee1b68 RM |
280 | unsigned long retval = task_pt_regs(task)->flags; |
281 | ||
282 | /* | |
283 | * If the debugger set TF, hide it from the readout. | |
284 | */ | |
285 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
286 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 287 | |
1da177e4 LT |
288 | return retval; |
289 | } | |
290 | ||
06ee1b68 RM |
291 | static int set_flags(struct task_struct *task, unsigned long value) |
292 | { | |
293 | struct pt_regs *regs = task_pt_regs(task); | |
294 | ||
295 | /* | |
296 | * If the user value contains TF, mark that | |
297 | * it was not "us" (the debugger) that set it. | |
298 | * If not, make sure it stays set if we had. | |
299 | */ | |
300 | if (value & X86_EFLAGS_TF) | |
301 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
302 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
303 | value |= X86_EFLAGS_TF; | |
304 | ||
305 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int putreg(struct task_struct *child, | |
311 | unsigned long offset, unsigned long value) | |
312 | { | |
313 | switch (offset) { | |
314 | case offsetof(struct user_regs_struct, cs): | |
315 | case offsetof(struct user_regs_struct, ds): | |
316 | case offsetof(struct user_regs_struct, es): | |
317 | case offsetof(struct user_regs_struct, fs): | |
318 | case offsetof(struct user_regs_struct, gs): | |
319 | case offsetof(struct user_regs_struct, ss): | |
320 | return set_segment_reg(child, offset, value); | |
321 | ||
322 | case offsetof(struct user_regs_struct, flags): | |
323 | return set_flags(child, value); | |
2047b08b RM |
324 | |
325 | #ifdef CONFIG_X86_64 | |
84c6f604 RM |
326 | /* |
327 | * Orig_ax is really just a flag with small positive and | |
328 | * negative values, so make sure to always sign-extend it | |
329 | * from 32 bits so that it works correctly regardless of | |
330 | * whether we come from a 32-bit environment or not. | |
331 | */ | |
332 | case offsetof(struct user_regs_struct, orig_ax): | |
333 | value = (long) (s32) value; | |
334 | break; | |
335 | ||
2047b08b RM |
336 | case offsetof(struct user_regs_struct,fs_base): |
337 | if (value >= TASK_SIZE_OF(child)) | |
338 | return -EIO; | |
339 | /* | |
340 | * When changing the segment base, use do_arch_prctl | |
341 | * to set either thread.fs or thread.fsindex and the | |
342 | * corresponding GDT slot. | |
343 | */ | |
344 | if (child->thread.fs != value) | |
345 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
346 | return 0; | |
347 | case offsetof(struct user_regs_struct,gs_base): | |
348 | /* | |
349 | * Exactly the same here as the %fs handling above. | |
350 | */ | |
351 | if (value >= TASK_SIZE_OF(child)) | |
352 | return -EIO; | |
353 | if (child->thread.gs != value) | |
354 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
355 | return 0; | |
356 | #endif | |
06ee1b68 RM |
357 | } |
358 | ||
359 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
364 | { | |
365 | switch (offset) { | |
366 | case offsetof(struct user_regs_struct, cs): | |
367 | case offsetof(struct user_regs_struct, ds): | |
368 | case offsetof(struct user_regs_struct, es): | |
369 | case offsetof(struct user_regs_struct, fs): | |
370 | case offsetof(struct user_regs_struct, gs): | |
371 | case offsetof(struct user_regs_struct, ss): | |
372 | return get_segment_reg(task, offset); | |
373 | ||
374 | case offsetof(struct user_regs_struct, flags): | |
375 | return get_flags(task); | |
2047b08b RM |
376 | |
377 | #ifdef CONFIG_X86_64 | |
378 | case offsetof(struct user_regs_struct, fs_base): { | |
379 | /* | |
380 | * do_arch_prctl may have used a GDT slot instead of | |
381 | * the MSR. To userland, it appears the same either | |
382 | * way, except the %fs segment selector might not be 0. | |
383 | */ | |
384 | unsigned int seg = task->thread.fsindex; | |
385 | if (task->thread.fs != 0) | |
386 | return task->thread.fs; | |
387 | if (task == current) | |
388 | asm("movl %%fs,%0" : "=r" (seg)); | |
389 | if (seg != FS_TLS_SEL) | |
390 | return 0; | |
391 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
392 | } | |
393 | case offsetof(struct user_regs_struct, gs_base): { | |
394 | /* | |
395 | * Exactly the same here as the %fs handling above. | |
396 | */ | |
397 | unsigned int seg = task->thread.gsindex; | |
398 | if (task->thread.gs != 0) | |
399 | return task->thread.gs; | |
400 | if (task == current) | |
401 | asm("movl %%gs,%0" : "=r" (seg)); | |
402 | if (seg != GS_TLS_SEL) | |
403 | return 0; | |
404 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
405 | } | |
406 | #endif | |
06ee1b68 RM |
407 | } |
408 | ||
409 | return *pt_regs_access(task_pt_regs(task), offset); | |
410 | } | |
411 | ||
91e7b707 RM |
412 | static int genregs_get(struct task_struct *target, |
413 | const struct user_regset *regset, | |
414 | unsigned int pos, unsigned int count, | |
415 | void *kbuf, void __user *ubuf) | |
416 | { | |
417 | if (kbuf) { | |
418 | unsigned long *k = kbuf; | |
419 | while (count > 0) { | |
420 | *k++ = getreg(target, pos); | |
421 | count -= sizeof(*k); | |
422 | pos += sizeof(*k); | |
423 | } | |
424 | } else { | |
425 | unsigned long __user *u = ubuf; | |
426 | while (count > 0) { | |
427 | if (__put_user(getreg(target, pos), u++)) | |
428 | return -EFAULT; | |
429 | count -= sizeof(*u); | |
430 | pos += sizeof(*u); | |
431 | } | |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | static int genregs_set(struct task_struct *target, | |
438 | const struct user_regset *regset, | |
439 | unsigned int pos, unsigned int count, | |
440 | const void *kbuf, const void __user *ubuf) | |
441 | { | |
442 | int ret = 0; | |
443 | if (kbuf) { | |
444 | const unsigned long *k = kbuf; | |
445 | while (count > 0 && !ret) { | |
446 | ret = putreg(target, pos, *k++); | |
447 | count -= sizeof(*k); | |
448 | pos += sizeof(*k); | |
449 | } | |
450 | } else { | |
451 | const unsigned long __user *u = ubuf; | |
452 | while (count > 0 && !ret) { | |
453 | unsigned long word; | |
454 | ret = __get_user(word, u++); | |
455 | if (ret) | |
456 | break; | |
457 | ret = putreg(target, pos, word); | |
458 | count -= sizeof(*u); | |
459 | pos += sizeof(*u); | |
460 | } | |
461 | } | |
462 | return ret; | |
463 | } | |
464 | ||
d9771e8c RM |
465 | /* |
466 | * This function is trivial and will be inlined by the compiler. | |
467 | * Having it separates the implementation details of debug | |
468 | * registers from the interface details of ptrace. | |
469 | */ | |
470 | static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) | |
471 | { | |
0f534093 RM |
472 | switch (n) { |
473 | case 0: return child->thread.debugreg0; | |
474 | case 1: return child->thread.debugreg1; | |
475 | case 2: return child->thread.debugreg2; | |
476 | case 3: return child->thread.debugreg3; | |
477 | case 6: return child->thread.debugreg6; | |
478 | case 7: return child->thread.debugreg7; | |
479 | } | |
480 | return 0; | |
d9771e8c RM |
481 | } |
482 | ||
483 | static int ptrace_set_debugreg(struct task_struct *child, | |
484 | int n, unsigned long data) | |
485 | { | |
0f534093 RM |
486 | int i; |
487 | ||
d9771e8c RM |
488 | if (unlikely(n == 4 || n == 5)) |
489 | return -EIO; | |
490 | ||
2047b08b | 491 | if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
d9771e8c RM |
492 | return -EIO; |
493 | ||
0f534093 RM |
494 | switch (n) { |
495 | case 0: child->thread.debugreg0 = data; break; | |
496 | case 1: child->thread.debugreg1 = data; break; | |
497 | case 2: child->thread.debugreg2 = data; break; | |
498 | case 3: child->thread.debugreg3 = data; break; | |
499 | ||
500 | case 6: | |
2047b08b RM |
501 | if ((data & ~0xffffffffUL) != 0) |
502 | return -EIO; | |
0f534093 RM |
503 | child->thread.debugreg6 = data; |
504 | break; | |
505 | ||
506 | case 7: | |
d9771e8c RM |
507 | /* |
508 | * Sanity-check data. Take one half-byte at once with | |
509 | * check = (val >> (16 + 4*i)) & 0xf. It contains the | |
510 | * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits | |
511 | * 2 and 3 are LENi. Given a list of invalid values, | |
512 | * we do mask |= 1 << invalid_value, so that | |
513 | * (mask >> check) & 1 is a correct test for invalid | |
514 | * values. | |
515 | * | |
516 | * R/Wi contains the type of the breakpoint / | |
517 | * watchpoint, LENi contains the length of the watched | |
518 | * data in the watchpoint case. | |
519 | * | |
520 | * The invalid values are: | |
2047b08b | 521 | * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
d9771e8c RM |
522 | * - R/Wi == 0x10 (break on I/O reads or writes), so |
523 | * mask |= 0x4444. | |
524 | * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= | |
525 | * 0x1110. | |
526 | * | |
527 | * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. | |
528 | * | |
529 | * See the Intel Manual "System Programming Guide", | |
530 | * 15.2.4 | |
531 | * | |
532 | * Note that LENi == 0x10 is defined on x86_64 in long | |
533 | * mode (i.e. even for 32-bit userspace software, but | |
534 | * 64-bit kernel), so the x86_64 mask value is 0x5454. | |
535 | * See the AMD manual no. 24593 (AMD64 System Programming) | |
536 | */ | |
2047b08b RM |
537 | #ifdef CONFIG_X86_32 |
538 | #define DR7_MASK 0x5f54 | |
539 | #else | |
540 | #define DR7_MASK 0x5554 | |
541 | #endif | |
d9771e8c RM |
542 | data &= ~DR_CONTROL_RESERVED; |
543 | for (i = 0; i < 4; i++) | |
2047b08b | 544 | if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
d9771e8c | 545 | return -EIO; |
0f534093 | 546 | child->thread.debugreg7 = data; |
d9771e8c RM |
547 | if (data) |
548 | set_tsk_thread_flag(child, TIF_DEBUG); | |
549 | else | |
550 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
0f534093 | 551 | break; |
d9771e8c RM |
552 | } |
553 | ||
d9771e8c RM |
554 | return 0; |
555 | } | |
556 | ||
b4ef95de IM |
557 | #ifdef X86_BTS |
558 | ||
a95d67f8 | 559 | static int ptrace_bts_get_size(struct task_struct *child) |
eee3af4a MM |
560 | { |
561 | if (!child->thread.ds_area_msr) | |
562 | return -ENXIO; | |
563 | ||
a95d67f8 | 564 | return ds_get_bts_index((void *)child->thread.ds_area_msr); |
eee3af4a MM |
565 | } |
566 | ||
eee3af4a MM |
567 | static int ptrace_bts_read_record(struct task_struct *child, |
568 | long index, | |
569 | struct bts_struct __user *out) | |
570 | { | |
571 | struct bts_struct ret; | |
572 | int retval; | |
a95d67f8 | 573 | int bts_end; |
e4811f25 | 574 | int bts_index; |
eee3af4a MM |
575 | |
576 | if (!child->thread.ds_area_msr) | |
577 | return -ENXIO; | |
578 | ||
e4811f25 MM |
579 | if (index < 0) |
580 | return -EINVAL; | |
581 | ||
a95d67f8 MM |
582 | bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr); |
583 | if (bts_end <= index) | |
e4811f25 MM |
584 | return -EINVAL; |
585 | ||
586 | /* translate the ptrace bts index into the ds bts index */ | |
587 | bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr); | |
588 | bts_index -= (index + 1); | |
589 | if (bts_index < 0) | |
a95d67f8 | 590 | bts_index += bts_end; |
e4811f25 | 591 | |
eee3af4a | 592 | retval = ds_read_bts((void *)child->thread.ds_area_msr, |
e4811f25 | 593 | bts_index, &ret); |
e6ae5d95 | 594 | if (retval < 0) |
eee3af4a MM |
595 | return retval; |
596 | ||
597 | if (copy_to_user(out, &ret, sizeof(ret))) | |
598 | return -EFAULT; | |
599 | ||
600 | return sizeof(ret); | |
601 | } | |
602 | ||
a95d67f8 | 603 | static int ptrace_bts_clear(struct task_struct *child) |
eee3af4a | 604 | { |
a95d67f8 MM |
605 | if (!child->thread.ds_area_msr) |
606 | return -ENXIO; | |
eee3af4a | 607 | |
a95d67f8 MM |
608 | return ds_clear((void *)child->thread.ds_area_msr); |
609 | } | |
610 | ||
611 | static int ptrace_bts_drain(struct task_struct *child, | |
cba4b65d | 612 | long size, |
a95d67f8 MM |
613 | struct bts_struct __user *out) |
614 | { | |
615 | int end, i; | |
616 | void *ds = (void *)child->thread.ds_area_msr; | |
617 | ||
618 | if (!ds) | |
eee3af4a MM |
619 | return -ENXIO; |
620 | ||
a95d67f8 MM |
621 | end = ds_get_bts_index(ds); |
622 | if (end <= 0) | |
623 | return end; | |
624 | ||
cba4b65d MM |
625 | if (size < (end * sizeof(struct bts_struct))) |
626 | return -EIO; | |
627 | ||
a95d67f8 MM |
628 | for (i = 0; i < end; i++, out++) { |
629 | struct bts_struct ret; | |
630 | int retval; | |
631 | ||
632 | retval = ds_read_bts(ds, i, &ret); | |
633 | if (retval < 0) | |
634 | return retval; | |
635 | ||
636 | if (copy_to_user(out, &ret, sizeof(ret))) | |
637 | return -EFAULT; | |
638 | } | |
639 | ||
640 | ds_clear(ds); | |
641 | ||
cba4b65d | 642 | return end; |
a95d67f8 MM |
643 | } |
644 | ||
645 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 646 | long cfg_size, |
a95d67f8 MM |
647 | const struct ptrace_bts_config __user *ucfg) |
648 | { | |
649 | struct ptrace_bts_config cfg; | |
da35c371 | 650 | int bts_size, ret = 0; |
a95d67f8 MM |
651 | void *ds; |
652 | ||
cba4b65d MM |
653 | if (cfg_size < sizeof(cfg)) |
654 | return -EIO; | |
655 | ||
a95d67f8 MM |
656 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
657 | return -EFAULT; | |
658 | ||
cba4b65d MM |
659 | if ((int)cfg.size < 0) |
660 | return -EINVAL; | |
661 | ||
a95d67f8 MM |
662 | bts_size = 0; |
663 | ds = (void *)child->thread.ds_area_msr; | |
664 | if (ds) { | |
665 | bts_size = ds_get_bts_size(ds); | |
666 | if (bts_size < 0) | |
667 | return bts_size; | |
668 | } | |
da35c371 | 669 | cfg.size = PAGE_ALIGN(cfg.size); |
a95d67f8 MM |
670 | |
671 | if (bts_size != cfg.size) { | |
da35c371 MM |
672 | ret = ptrace_bts_realloc(child, cfg.size, |
673 | cfg.flags & PTRACE_BTS_O_CUT_SIZE); | |
a95d67f8 | 674 | if (ret < 0) |
da35c371 | 675 | goto errout; |
a95d67f8 | 676 | |
a95d67f8 | 677 | ds = (void *)child->thread.ds_area_msr; |
a95d67f8 MM |
678 | } |
679 | ||
da35c371 MM |
680 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) |
681 | ret = ds_set_overflow(ds, DS_O_SIGNAL); | |
682 | else | |
683 | ret = ds_set_overflow(ds, DS_O_WRAP); | |
684 | if (ret < 0) | |
685 | goto errout; | |
eee3af4a | 686 | |
da35c371 MM |
687 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
688 | child->thread.debugctlmsr |= ds_debugctl_mask(); | |
689 | else | |
690 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); | |
eee3af4a | 691 | |
da35c371 | 692 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
eee3af4a MM |
693 | set_tsk_thread_flag(child, TIF_BTS_TRACE_TS); |
694 | else | |
695 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
696 | ||
cba4b65d MM |
697 | ret = sizeof(cfg); |
698 | ||
da35c371 MM |
699 | out: |
700 | if (child->thread.debugctlmsr) | |
701 | set_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
702 | else | |
703 | clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
704 | ||
705 | return ret; | |
706 | ||
707 | errout: | |
708 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); | |
709 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
710 | goto out; | |
eee3af4a MM |
711 | } |
712 | ||
a95d67f8 | 713 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 714 | long cfg_size, |
a95d67f8 | 715 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 716 | { |
a95d67f8 MM |
717 | void *ds = (void *)child->thread.ds_area_msr; |
718 | struct ptrace_bts_config cfg; | |
eee3af4a | 719 | |
cba4b65d MM |
720 | if (cfg_size < sizeof(cfg)) |
721 | return -EIO; | |
722 | ||
a95d67f8 | 723 | memset(&cfg, 0, sizeof(cfg)); |
eee3af4a | 724 | |
a95d67f8 MM |
725 | if (ds) { |
726 | cfg.size = ds_get_bts_size(ds); | |
eee3af4a | 727 | |
a95d67f8 MM |
728 | if (ds_get_overflow(ds) == DS_O_SIGNAL) |
729 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 730 | |
a95d67f8 MM |
731 | if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) && |
732 | child->thread.debugctlmsr & ds_debugctl_mask()) | |
733 | cfg.flags |= PTRACE_BTS_O_TRACE; | |
eee3af4a | 734 | |
a95d67f8 MM |
735 | if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS)) |
736 | cfg.flags |= PTRACE_BTS_O_SCHED; | |
eee3af4a MM |
737 | } |
738 | ||
87e8407f MM |
739 | cfg.bts_size = sizeof(struct bts_struct); |
740 | ||
a95d67f8 MM |
741 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
742 | return -EFAULT; | |
eee3af4a | 743 | |
a95d67f8 | 744 | return sizeof(cfg); |
eee3af4a MM |
745 | } |
746 | ||
d8d4f157 AM |
747 | |
748 | static int ptrace_bts_write_record(struct task_struct *child, | |
749 | const struct bts_struct *in) | |
750 | { | |
751 | int retval; | |
752 | ||
753 | if (!child->thread.ds_area_msr) | |
754 | return -ENXIO; | |
755 | ||
756 | retval = ds_write_bts((void *)child->thread.ds_area_msr, in); | |
757 | if (retval) | |
758 | return retval; | |
759 | ||
760 | return sizeof(*in); | |
761 | } | |
762 | ||
763 | static int ptrace_bts_realloc(struct task_struct *child, | |
764 | int size, int reduce_size) | |
765 | { | |
766 | unsigned long rlim, vm; | |
767 | int ret, old_size; | |
768 | ||
769 | if (size < 0) | |
770 | return -EINVAL; | |
771 | ||
772 | old_size = ds_get_bts_size((void *)child->thread.ds_area_msr); | |
773 | if (old_size < 0) | |
774 | return old_size; | |
775 | ||
776 | ret = ds_free((void **)&child->thread.ds_area_msr); | |
777 | if (ret < 0) | |
778 | goto out; | |
779 | ||
780 | size >>= PAGE_SHIFT; | |
781 | old_size >>= PAGE_SHIFT; | |
782 | ||
783 | current->mm->total_vm -= old_size; | |
784 | current->mm->locked_vm -= old_size; | |
785 | ||
786 | if (size == 0) | |
787 | goto out; | |
788 | ||
789 | rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT; | |
790 | vm = current->mm->total_vm + size; | |
791 | if (rlim < vm) { | |
792 | ret = -ENOMEM; | |
793 | ||
794 | if (!reduce_size) | |
795 | goto out; | |
796 | ||
797 | size = rlim - current->mm->total_vm; | |
798 | if (size <= 0) | |
799 | goto out; | |
800 | } | |
801 | ||
802 | rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; | |
803 | vm = current->mm->locked_vm + size; | |
804 | if (rlim < vm) { | |
805 | ret = -ENOMEM; | |
806 | ||
807 | if (!reduce_size) | |
808 | goto out; | |
809 | ||
810 | size = rlim - current->mm->locked_vm; | |
811 | if (size <= 0) | |
812 | goto out; | |
813 | } | |
814 | ||
815 | ret = ds_allocate((void **)&child->thread.ds_area_msr, | |
816 | size << PAGE_SHIFT); | |
817 | if (ret < 0) | |
818 | goto out; | |
819 | ||
820 | current->mm->total_vm += size; | |
821 | current->mm->locked_vm += size; | |
822 | ||
823 | out: | |
824 | if (child->thread.ds_area_msr) | |
825 | set_tsk_thread_flag(child, TIF_DS_AREA_MSR); | |
826 | else | |
827 | clear_tsk_thread_flag(child, TIF_DS_AREA_MSR); | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
eee3af4a MM |
832 | void ptrace_bts_take_timestamp(struct task_struct *tsk, |
833 | enum bts_qualifier qualifier) | |
834 | { | |
835 | struct bts_struct rec = { | |
836 | .qualifier = qualifier, | |
da35c371 | 837 | .variant.jiffies = jiffies_64 |
eee3af4a MM |
838 | }; |
839 | ||
eee3af4a MM |
840 | ptrace_bts_write_record(tsk, &rec); |
841 | } | |
b4ef95de | 842 | #endif /* X86_BTS */ |
eee3af4a | 843 | |
1da177e4 LT |
844 | /* |
845 | * Called by kernel/ptrace.c when detaching.. | |
846 | * | |
847 | * Make sure the single step bit is not set. | |
848 | */ | |
849 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 850 | { |
7f232343 | 851 | user_disable_single_step(child); |
e9c86c78 | 852 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 853 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 854 | #endif |
eee3af4a | 855 | if (child->thread.ds_area_msr) { |
b4ef95de | 856 | #ifdef X86_BTS |
da35c371 | 857 | ptrace_bts_realloc(child, 0, 0); |
b4ef95de | 858 | #endif |
da35c371 MM |
859 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); |
860 | if (!child->thread.debugctlmsr) | |
861 | clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
862 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
eee3af4a | 863 | } |
1da177e4 LT |
864 | } |
865 | ||
5a4646a4 RM |
866 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
867 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
868 | #endif | |
869 | ||
481bed45 | 870 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 871 | { |
5a4646a4 | 872 | int ret; |
1da177e4 LT |
873 | unsigned long __user *datap = (unsigned long __user *)data; |
874 | ||
1da177e4 | 875 | switch (request) { |
1da177e4 LT |
876 | /* read the word at location addr in the USER area. */ |
877 | case PTRACE_PEEKUSR: { | |
878 | unsigned long tmp; | |
879 | ||
880 | ret = -EIO; | |
e9c86c78 RM |
881 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
882 | addr >= sizeof(struct user)) | |
1da177e4 LT |
883 | break; |
884 | ||
885 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 886 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 887 | tmp = getreg(child, addr); |
e9c86c78 RM |
888 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
889 | addr <= offsetof(struct user, u_debugreg[7])) { | |
890 | addr -= offsetof(struct user, u_debugreg[0]); | |
891 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
892 | } |
893 | ret = put_user(tmp, datap); | |
894 | break; | |
895 | } | |
896 | ||
1da177e4 LT |
897 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
898 | ret = -EIO; | |
e9c86c78 RM |
899 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
900 | addr >= sizeof(struct user)) | |
1da177e4 LT |
901 | break; |
902 | ||
e9c86c78 | 903 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 904 | ret = putreg(child, addr, data); |
e9c86c78 RM |
905 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
906 | addr <= offsetof(struct user, u_debugreg[7])) { | |
907 | addr -= offsetof(struct user, u_debugreg[0]); | |
908 | ret = ptrace_set_debugreg(child, | |
909 | addr / sizeof(data), data); | |
1da177e4 | 910 | } |
e9c86c78 | 911 | break; |
1da177e4 | 912 | |
5a4646a4 RM |
913 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
914 | return copy_regset_to_user(child, | |
915 | task_user_regset_view(current), | |
916 | REGSET_GENERAL, | |
917 | 0, sizeof(struct user_regs_struct), | |
918 | datap); | |
919 | ||
920 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
921 | return copy_regset_from_user(child, | |
922 | task_user_regset_view(current), | |
923 | REGSET_GENERAL, | |
924 | 0, sizeof(struct user_regs_struct), | |
925 | datap); | |
926 | ||
927 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
928 | return copy_regset_to_user(child, | |
929 | task_user_regset_view(current), | |
930 | REGSET_FP, | |
931 | 0, sizeof(struct user_i387_struct), | |
932 | datap); | |
933 | ||
934 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
935 | return copy_regset_from_user(child, | |
936 | task_user_regset_view(current), | |
937 | REGSET_FP, | |
938 | 0, sizeof(struct user_i387_struct), | |
939 | datap); | |
1da177e4 | 940 | |
e9c86c78 | 941 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
942 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
943 | return copy_regset_to_user(child, &user_x86_32_view, | |
944 | REGSET_XFP, | |
945 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 946 | datap) ? -EIO : 0; |
5a4646a4 RM |
947 | |
948 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
949 | return copy_regset_from_user(child, &user_x86_32_view, | |
950 | REGSET_XFP, | |
951 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 952 | datap) ? -EIO : 0; |
e9c86c78 | 953 | #endif |
1da177e4 | 954 | |
e9c86c78 | 955 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 956 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
957 | if (addr < 0) |
958 | return -EIO; | |
959 | ret = do_get_thread_area(child, addr, | |
960 | (struct user_desc __user *) data); | |
1da177e4 LT |
961 | break; |
962 | ||
963 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
964 | if (addr < 0) |
965 | return -EIO; | |
966 | ret = do_set_thread_area(child, addr, | |
967 | (struct user_desc __user *) data, 0); | |
1da177e4 | 968 | break; |
e9c86c78 RM |
969 | #endif |
970 | ||
971 | #ifdef CONFIG_X86_64 | |
972 | /* normal 64bit interface to access TLS data. | |
973 | Works just like arch_prctl, except that the arguments | |
974 | are reversed. */ | |
975 | case PTRACE_ARCH_PRCTL: | |
976 | ret = do_arch_prctl(child, data, addr); | |
977 | break; | |
978 | #endif | |
1da177e4 | 979 | |
b4ef95de IM |
980 | /* |
981 | * These bits need more cooking - not enabled yet: | |
982 | */ | |
983 | #ifdef X86_BTS | |
a95d67f8 MM |
984 | case PTRACE_BTS_CONFIG: |
985 | ret = ptrace_bts_config | |
cba4b65d | 986 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
987 | break; |
988 | ||
a95d67f8 MM |
989 | case PTRACE_BTS_STATUS: |
990 | ret = ptrace_bts_status | |
cba4b65d | 991 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
992 | break; |
993 | ||
a95d67f8 MM |
994 | case PTRACE_BTS_SIZE: |
995 | ret = ptrace_bts_get_size(child); | |
eee3af4a MM |
996 | break; |
997 | ||
a95d67f8 | 998 | case PTRACE_BTS_GET: |
eee3af4a | 999 | ret = ptrace_bts_read_record |
a95d67f8 | 1000 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1001 | break; |
1002 | ||
a95d67f8 MM |
1003 | case PTRACE_BTS_CLEAR: |
1004 | ret = ptrace_bts_clear(child); | |
eee3af4a MM |
1005 | break; |
1006 | ||
a95d67f8 MM |
1007 | case PTRACE_BTS_DRAIN: |
1008 | ret = ptrace_bts_drain | |
cba4b65d | 1009 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1010 | break; |
b4ef95de | 1011 | #endif |
eee3af4a | 1012 | |
1da177e4 LT |
1013 | default: |
1014 | ret = ptrace_request(child, request, addr, data); | |
1015 | break; | |
1016 | } | |
d9771e8c | 1017 | |
1da177e4 LT |
1018 | return ret; |
1019 | } | |
1020 | ||
cb757c41 RM |
1021 | #ifdef CONFIG_IA32_EMULATION |
1022 | ||
099cd6e9 RM |
1023 | #include <linux/compat.h> |
1024 | #include <linux/syscalls.h> | |
1025 | #include <asm/ia32.h> | |
cb757c41 RM |
1026 | #include <asm/user32.h> |
1027 | ||
1028 | #define R32(l,q) \ | |
1029 | case offsetof(struct user32, regs.l): \ | |
1030 | regs->q = value; break | |
1031 | ||
1032 | #define SEG32(rs) \ | |
1033 | case offsetof(struct user32, regs.rs): \ | |
1034 | return set_segment_reg(child, \ | |
1035 | offsetof(struct user_regs_struct, rs), \ | |
1036 | value); \ | |
1037 | break | |
1038 | ||
1039 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1040 | { | |
1041 | struct pt_regs *regs = task_pt_regs(child); | |
1042 | ||
1043 | switch (regno) { | |
1044 | ||
1045 | SEG32(cs); | |
1046 | SEG32(ds); | |
1047 | SEG32(es); | |
1048 | SEG32(fs); | |
1049 | SEG32(gs); | |
1050 | SEG32(ss); | |
1051 | ||
1052 | R32(ebx, bx); | |
1053 | R32(ecx, cx); | |
1054 | R32(edx, dx); | |
1055 | R32(edi, di); | |
1056 | R32(esi, si); | |
1057 | R32(ebp, bp); | |
1058 | R32(eax, ax); | |
cb757c41 RM |
1059 | R32(eip, ip); |
1060 | R32(esp, sp); | |
1061 | ||
40f0933d RM |
1062 | case offsetof(struct user32, regs.orig_eax): |
1063 | /* | |
1064 | * Sign-extend the value so that orig_eax = -1 | |
1065 | * causes (long)orig_ax < 0 tests to fire correctly. | |
1066 | */ | |
1067 | regs->orig_ax = (long) (s32) value; | |
1068 | break; | |
1069 | ||
cb757c41 RM |
1070 | case offsetof(struct user32, regs.eflags): |
1071 | return set_flags(child, value); | |
1072 | ||
1073 | case offsetof(struct user32, u_debugreg[0]) ... | |
1074 | offsetof(struct user32, u_debugreg[7]): | |
1075 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1076 | return ptrace_set_debugreg(child, regno / 4, value); | |
1077 | ||
1078 | default: | |
1079 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1080 | return -EIO; | |
1081 | ||
1082 | /* | |
1083 | * Other dummy fields in the virtual user structure | |
1084 | * are ignored | |
1085 | */ | |
1086 | break; | |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | #undef R32 | |
1092 | #undef SEG32 | |
1093 | ||
1094 | #define R32(l,q) \ | |
1095 | case offsetof(struct user32, regs.l): \ | |
1096 | *val = regs->q; break | |
1097 | ||
1098 | #define SEG32(rs) \ | |
1099 | case offsetof(struct user32, regs.rs): \ | |
1100 | *val = get_segment_reg(child, \ | |
1101 | offsetof(struct user_regs_struct, rs)); \ | |
1102 | break | |
1103 | ||
1104 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1105 | { | |
1106 | struct pt_regs *regs = task_pt_regs(child); | |
1107 | ||
1108 | switch (regno) { | |
1109 | ||
1110 | SEG32(ds); | |
1111 | SEG32(es); | |
1112 | SEG32(fs); | |
1113 | SEG32(gs); | |
1114 | ||
1115 | R32(cs, cs); | |
1116 | R32(ss, ss); | |
1117 | R32(ebx, bx); | |
1118 | R32(ecx, cx); | |
1119 | R32(edx, dx); | |
1120 | R32(edi, di); | |
1121 | R32(esi, si); | |
1122 | R32(ebp, bp); | |
1123 | R32(eax, ax); | |
1124 | R32(orig_eax, orig_ax); | |
1125 | R32(eip, ip); | |
1126 | R32(esp, sp); | |
1127 | ||
1128 | case offsetof(struct user32, regs.eflags): | |
1129 | *val = get_flags(child); | |
1130 | break; | |
1131 | ||
1132 | case offsetof(struct user32, u_debugreg[0]) ... | |
1133 | offsetof(struct user32, u_debugreg[7]): | |
1134 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1135 | *val = ptrace_get_debugreg(child, regno / 4); | |
1136 | break; | |
1137 | ||
1138 | default: | |
1139 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1140 | return -EIO; | |
1141 | ||
1142 | /* | |
1143 | * Other dummy fields in the virtual user structure | |
1144 | * are ignored | |
1145 | */ | |
1146 | *val = 0; | |
1147 | break; | |
1148 | } | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | #undef R32 | |
1153 | #undef SEG32 | |
1154 | ||
91e7b707 RM |
1155 | static int genregs32_get(struct task_struct *target, |
1156 | const struct user_regset *regset, | |
1157 | unsigned int pos, unsigned int count, | |
1158 | void *kbuf, void __user *ubuf) | |
1159 | { | |
1160 | if (kbuf) { | |
1161 | compat_ulong_t *k = kbuf; | |
1162 | while (count > 0) { | |
1163 | getreg32(target, pos, k++); | |
1164 | count -= sizeof(*k); | |
1165 | pos += sizeof(*k); | |
1166 | } | |
1167 | } else { | |
1168 | compat_ulong_t __user *u = ubuf; | |
1169 | while (count > 0) { | |
1170 | compat_ulong_t word; | |
1171 | getreg32(target, pos, &word); | |
1172 | if (__put_user(word, u++)) | |
1173 | return -EFAULT; | |
1174 | count -= sizeof(*u); | |
1175 | pos += sizeof(*u); | |
1176 | } | |
1177 | } | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | static int genregs32_set(struct task_struct *target, | |
1183 | const struct user_regset *regset, | |
1184 | unsigned int pos, unsigned int count, | |
1185 | const void *kbuf, const void __user *ubuf) | |
1186 | { | |
1187 | int ret = 0; | |
1188 | if (kbuf) { | |
1189 | const compat_ulong_t *k = kbuf; | |
1190 | while (count > 0 && !ret) { | |
f9cb02b0 | 1191 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1192 | count -= sizeof(*k); |
1193 | pos += sizeof(*k); | |
1194 | } | |
1195 | } else { | |
1196 | const compat_ulong_t __user *u = ubuf; | |
1197 | while (count > 0 && !ret) { | |
1198 | compat_ulong_t word; | |
1199 | ret = __get_user(word, u++); | |
1200 | if (ret) | |
1201 | break; | |
f9cb02b0 | 1202 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1203 | count -= sizeof(*u); |
1204 | pos += sizeof(*u); | |
1205 | } | |
1206 | } | |
1207 | return ret; | |
1208 | } | |
1209 | ||
562b80ba RM |
1210 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1211 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1212 | { |
562b80ba RM |
1213 | unsigned long addr = caddr; |
1214 | unsigned long data = cdata; | |
099cd6e9 RM |
1215 | void __user *datap = compat_ptr(data); |
1216 | int ret; | |
1217 | __u32 val; | |
1218 | ||
099cd6e9 | 1219 | switch (request) { |
099cd6e9 RM |
1220 | case PTRACE_PEEKUSR: |
1221 | ret = getreg32(child, addr, &val); | |
1222 | if (ret == 0) | |
1223 | ret = put_user(val, (__u32 __user *)datap); | |
1224 | break; | |
1225 | ||
1226 | case PTRACE_POKEUSR: | |
1227 | ret = putreg32(child, addr, data); | |
1228 | break; | |
1229 | ||
5a4646a4 RM |
1230 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1231 | return copy_regset_to_user(child, &user_x86_32_view, | |
1232 | REGSET_GENERAL, | |
1233 | 0, sizeof(struct user_regs_struct32), | |
1234 | datap); | |
1235 | ||
1236 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1237 | return copy_regset_from_user(child, &user_x86_32_view, | |
1238 | REGSET_GENERAL, 0, | |
1239 | sizeof(struct user_regs_struct32), | |
1240 | datap); | |
1241 | ||
1242 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1243 | return copy_regset_to_user(child, &user_x86_32_view, | |
1244 | REGSET_FP, 0, | |
1245 | sizeof(struct user_i387_ia32_struct), | |
1246 | datap); | |
1247 | ||
1248 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1249 | return copy_regset_from_user( | |
1250 | child, &user_x86_32_view, REGSET_FP, | |
1251 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1252 | ||
1253 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1254 | return copy_regset_to_user(child, &user_x86_32_view, | |
1255 | REGSET_XFP, 0, | |
1256 | sizeof(struct user32_fxsr_struct), | |
1257 | datap); | |
1258 | ||
1259 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1260 | return copy_regset_from_user(child, &user_x86_32_view, | |
1261 | REGSET_XFP, 0, | |
1262 | sizeof(struct user32_fxsr_struct), | |
1263 | datap); | |
099cd6e9 | 1264 | |
562b80ba RM |
1265 | case PTRACE_GET_THREAD_AREA: |
1266 | case PTRACE_SET_THREAD_AREA: | |
1267 | return arch_ptrace(child, request, addr, data); | |
1268 | ||
099cd6e9 | 1269 | default: |
fdadd54d | 1270 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1271 | } |
1272 | ||
099cd6e9 RM |
1273 | return ret; |
1274 | } | |
1275 | ||
cb757c41 RM |
1276 | #endif /* CONFIG_IA32_EMULATION */ |
1277 | ||
070459d9 RM |
1278 | #ifdef CONFIG_X86_64 |
1279 | ||
1280 | static const struct user_regset x86_64_regsets[] = { | |
1281 | [REGSET_GENERAL] = { | |
1282 | .core_note_type = NT_PRSTATUS, | |
1283 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1284 | .size = sizeof(long), .align = sizeof(long), | |
1285 | .get = genregs_get, .set = genregs_set | |
1286 | }, | |
1287 | [REGSET_FP] = { | |
1288 | .core_note_type = NT_PRFPREG, | |
1289 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1290 | .size = sizeof(long), .align = sizeof(long), | |
1291 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1292 | }, | |
1293 | }; | |
1294 | ||
1295 | static const struct user_regset_view user_x86_64_view = { | |
1296 | .name = "x86_64", .e_machine = EM_X86_64, | |
1297 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1298 | }; | |
1299 | ||
1300 | #else /* CONFIG_X86_32 */ | |
1301 | ||
1302 | #define user_regs_struct32 user_regs_struct | |
1303 | #define genregs32_get genregs_get | |
1304 | #define genregs32_set genregs_set | |
1305 | ||
1f465f4e RM |
1306 | #define user_i387_ia32_struct user_i387_struct |
1307 | #define user32_fxsr_struct user_fxsr_struct | |
1308 | ||
070459d9 RM |
1309 | #endif /* CONFIG_X86_64 */ |
1310 | ||
1311 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1312 | static const struct user_regset x86_32_regsets[] = { | |
1313 | [REGSET_GENERAL] = { | |
1314 | .core_note_type = NT_PRSTATUS, | |
1315 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1316 | .size = sizeof(u32), .align = sizeof(u32), | |
1317 | .get = genregs32_get, .set = genregs32_set | |
1318 | }, | |
1319 | [REGSET_FP] = { | |
1320 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1321 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1322 | .size = sizeof(u32), .align = sizeof(u32), |
1323 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1324 | }, | |
1325 | [REGSET_XFP] = { | |
1326 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1327 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1328 | .size = sizeof(u32), .align = sizeof(u32), |
1329 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1330 | }, | |
1331 | [REGSET_TLS] = { | |
bb61682b | 1332 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1333 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1334 | .size = sizeof(struct user_desc), | |
1335 | .align = sizeof(struct user_desc), | |
1336 | .active = regset_tls_active, | |
1337 | .get = regset_tls_get, .set = regset_tls_set | |
1338 | }, | |
1339 | }; | |
1340 | ||
1341 | static const struct user_regset_view user_x86_32_view = { | |
1342 | .name = "i386", .e_machine = EM_386, | |
1343 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1344 | }; | |
1345 | #endif | |
1346 | ||
1347 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1348 | { | |
1349 | #ifdef CONFIG_IA32_EMULATION | |
1350 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1351 | #endif | |
1352 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1353 | return &user_x86_32_view; | |
1354 | #endif | |
1355 | #ifdef CONFIG_X86_64 | |
1356 | return &user_x86_64_view; | |
1357 | #endif | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) |
1361 | { | |
1362 | struct siginfo info; | |
1363 | ||
1364 | tsk->thread.trap_no = 1; | |
1365 | tsk->thread.error_code = error_code; | |
1366 | ||
1367 | memset(&info, 0, sizeof(info)); | |
1368 | info.si_signo = SIGTRAP; | |
1369 | info.si_code = TRAP_BRKPT; | |
1370 | ||
65ea5b03 PA |
1371 | /* User-mode ip? */ |
1372 | info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; | |
1da177e4 | 1373 | |
27b46d76 | 1374 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1375 | force_sig_info(SIGTRAP, &info, tsk); |
1376 | } | |
1377 | ||
86976cd8 RM |
1378 | static void syscall_trace(struct pt_regs *regs) |
1379 | { | |
d4d67150 RM |
1380 | if (!(current->ptrace & PT_PTRACED)) |
1381 | return; | |
86976cd8 RM |
1382 | |
1383 | #if 0 | |
1384 | printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n", | |
1385 | current->comm, | |
1386 | regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0), | |
1387 | current_thread_info()->flags, current->ptrace); | |
1388 | #endif | |
1389 | ||
1390 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
1391 | ? 0x80 : 0)); | |
1392 | /* | |
1393 | * this isn't the same as continuing with a signal, but it will do | |
1394 | * for normal use. strace only continues with a signal if the | |
1395 | * stopping signal is not SIGTRAP. -brl | |
1396 | */ | |
1397 | if (current->exit_code) { | |
1398 | send_sig(current->exit_code, current, 1); | |
1399 | current->exit_code = 0; | |
1400 | } | |
1401 | } | |
1402 | ||
d4d67150 RM |
1403 | #ifdef CONFIG_X86_32 |
1404 | # define IS_IA32 1 | |
1405 | #elif defined CONFIG_IA32_EMULATION | |
1406 | # define IS_IA32 test_thread_flag(TIF_IA32) | |
1407 | #else | |
1408 | # define IS_IA32 0 | |
1409 | #endif | |
1410 | ||
1411 | /* | |
1412 | * We must return the syscall number to actually look up in the table. | |
1413 | * This can be -1L to skip running any syscall at all. | |
1414 | */ | |
1415 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1416 | { |
d4d67150 RM |
1417 | long ret = 0; |
1418 | ||
380fdd75 RM |
1419 | /* |
1420 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1421 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1422 | * If user-mode had set TF itself, then it's still clear from | |
1423 | * do_debug() and we need to set it again to restore the user | |
1424 | * state. If we entered on the slow path, TF was already set. | |
1425 | */ | |
1426 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1427 | regs->flags |= X86_EFLAGS_TF; | |
1428 | ||
86976cd8 RM |
1429 | /* do the secure computing check first */ |
1430 | secure_computing(regs->orig_ax); | |
1431 | ||
d4d67150 RM |
1432 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1433 | ret = -1L; | |
1434 | ||
1435 | if (ret || test_thread_flag(TIF_SYSCALL_TRACE)) | |
86976cd8 RM |
1436 | syscall_trace(regs); |
1437 | ||
1438 | if (unlikely(current->audit_context)) { | |
d4d67150 | 1439 | if (IS_IA32) |
86976cd8 RM |
1440 | audit_syscall_entry(AUDIT_ARCH_I386, |
1441 | regs->orig_ax, | |
1442 | regs->bx, regs->cx, | |
1443 | regs->dx, regs->si); | |
d4d67150 RM |
1444 | #ifdef CONFIG_X86_64 |
1445 | else | |
86976cd8 RM |
1446 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1447 | regs->orig_ax, | |
1448 | regs->di, regs->si, | |
1449 | regs->dx, regs->r10); | |
d4d67150 | 1450 | #endif |
86976cd8 | 1451 | } |
d4d67150 RM |
1452 | |
1453 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1454 | } |
1455 | ||
d4d67150 | 1456 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 RM |
1457 | { |
1458 | if (unlikely(current->audit_context)) | |
1459 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1460 | ||
d4d67150 | 1461 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
86976cd8 | 1462 | syscall_trace(regs); |
86976cd8 | 1463 | |
d4d67150 RM |
1464 | /* |
1465 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1466 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1467 | * We already reported this syscall instruction in | |
1468 | * syscall_trace_enter(), so don't do any more now. | |
1469 | */ | |
1470 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) | |
1471 | return; | |
1472 | ||
1473 | /* | |
1474 | * If we are single-stepping, synthesize a trap to follow the | |
1475 | * system call instruction. | |
1476 | */ | |
1477 | if (test_thread_flag(TIF_SINGLESTEP) && | |
1478 | (current->ptrace & PT_PTRACED)) | |
1479 | send_sigtrap(current, regs, 0); | |
1480 | } |