Commit | Line | Data |
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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 | |
326 | case offsetof(struct user_regs_struct,fs_base): | |
327 | if (value >= TASK_SIZE_OF(child)) | |
328 | return -EIO; | |
329 | /* | |
330 | * When changing the segment base, use do_arch_prctl | |
331 | * to set either thread.fs or thread.fsindex and the | |
332 | * corresponding GDT slot. | |
333 | */ | |
334 | if (child->thread.fs != value) | |
335 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
336 | return 0; | |
337 | case offsetof(struct user_regs_struct,gs_base): | |
338 | /* | |
339 | * Exactly the same here as the %fs handling above. | |
340 | */ | |
341 | if (value >= TASK_SIZE_OF(child)) | |
342 | return -EIO; | |
343 | if (child->thread.gs != value) | |
344 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
345 | return 0; | |
346 | #endif | |
06ee1b68 RM |
347 | } |
348 | ||
349 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
354 | { | |
355 | switch (offset) { | |
356 | case offsetof(struct user_regs_struct, cs): | |
357 | case offsetof(struct user_regs_struct, ds): | |
358 | case offsetof(struct user_regs_struct, es): | |
359 | case offsetof(struct user_regs_struct, fs): | |
360 | case offsetof(struct user_regs_struct, gs): | |
361 | case offsetof(struct user_regs_struct, ss): | |
362 | return get_segment_reg(task, offset); | |
363 | ||
364 | case offsetof(struct user_regs_struct, flags): | |
365 | return get_flags(task); | |
2047b08b RM |
366 | |
367 | #ifdef CONFIG_X86_64 | |
368 | case offsetof(struct user_regs_struct, fs_base): { | |
369 | /* | |
370 | * do_arch_prctl may have used a GDT slot instead of | |
371 | * the MSR. To userland, it appears the same either | |
372 | * way, except the %fs segment selector might not be 0. | |
373 | */ | |
374 | unsigned int seg = task->thread.fsindex; | |
375 | if (task->thread.fs != 0) | |
376 | return task->thread.fs; | |
377 | if (task == current) | |
378 | asm("movl %%fs,%0" : "=r" (seg)); | |
379 | if (seg != FS_TLS_SEL) | |
380 | return 0; | |
381 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
382 | } | |
383 | case offsetof(struct user_regs_struct, gs_base): { | |
384 | /* | |
385 | * Exactly the same here as the %fs handling above. | |
386 | */ | |
387 | unsigned int seg = task->thread.gsindex; | |
388 | if (task->thread.gs != 0) | |
389 | return task->thread.gs; | |
390 | if (task == current) | |
391 | asm("movl %%gs,%0" : "=r" (seg)); | |
392 | if (seg != GS_TLS_SEL) | |
393 | return 0; | |
394 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
395 | } | |
396 | #endif | |
06ee1b68 RM |
397 | } |
398 | ||
399 | return *pt_regs_access(task_pt_regs(task), offset); | |
400 | } | |
401 | ||
91e7b707 RM |
402 | static int genregs_get(struct task_struct *target, |
403 | const struct user_regset *regset, | |
404 | unsigned int pos, unsigned int count, | |
405 | void *kbuf, void __user *ubuf) | |
406 | { | |
407 | if (kbuf) { | |
408 | unsigned long *k = kbuf; | |
409 | while (count > 0) { | |
410 | *k++ = getreg(target, pos); | |
411 | count -= sizeof(*k); | |
412 | pos += sizeof(*k); | |
413 | } | |
414 | } else { | |
415 | unsigned long __user *u = ubuf; | |
416 | while (count > 0) { | |
417 | if (__put_user(getreg(target, pos), u++)) | |
418 | return -EFAULT; | |
419 | count -= sizeof(*u); | |
420 | pos += sizeof(*u); | |
421 | } | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | static int genregs_set(struct task_struct *target, | |
428 | const struct user_regset *regset, | |
429 | unsigned int pos, unsigned int count, | |
430 | const void *kbuf, const void __user *ubuf) | |
431 | { | |
432 | int ret = 0; | |
433 | if (kbuf) { | |
434 | const unsigned long *k = kbuf; | |
435 | while (count > 0 && !ret) { | |
436 | ret = putreg(target, pos, *k++); | |
437 | count -= sizeof(*k); | |
438 | pos += sizeof(*k); | |
439 | } | |
440 | } else { | |
441 | const unsigned long __user *u = ubuf; | |
442 | while (count > 0 && !ret) { | |
443 | unsigned long word; | |
444 | ret = __get_user(word, u++); | |
445 | if (ret) | |
446 | break; | |
447 | ret = putreg(target, pos, word); | |
448 | count -= sizeof(*u); | |
449 | pos += sizeof(*u); | |
450 | } | |
451 | } | |
452 | return ret; | |
453 | } | |
454 | ||
d9771e8c RM |
455 | /* |
456 | * This function is trivial and will be inlined by the compiler. | |
457 | * Having it separates the implementation details of debug | |
458 | * registers from the interface details of ptrace. | |
459 | */ | |
460 | static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) | |
461 | { | |
0f534093 RM |
462 | switch (n) { |
463 | case 0: return child->thread.debugreg0; | |
464 | case 1: return child->thread.debugreg1; | |
465 | case 2: return child->thread.debugreg2; | |
466 | case 3: return child->thread.debugreg3; | |
467 | case 6: return child->thread.debugreg6; | |
468 | case 7: return child->thread.debugreg7; | |
469 | } | |
470 | return 0; | |
d9771e8c RM |
471 | } |
472 | ||
473 | static int ptrace_set_debugreg(struct task_struct *child, | |
474 | int n, unsigned long data) | |
475 | { | |
0f534093 RM |
476 | int i; |
477 | ||
d9771e8c RM |
478 | if (unlikely(n == 4 || n == 5)) |
479 | return -EIO; | |
480 | ||
2047b08b | 481 | if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
d9771e8c RM |
482 | return -EIO; |
483 | ||
0f534093 RM |
484 | switch (n) { |
485 | case 0: child->thread.debugreg0 = data; break; | |
486 | case 1: child->thread.debugreg1 = data; break; | |
487 | case 2: child->thread.debugreg2 = data; break; | |
488 | case 3: child->thread.debugreg3 = data; break; | |
489 | ||
490 | case 6: | |
2047b08b RM |
491 | if ((data & ~0xffffffffUL) != 0) |
492 | return -EIO; | |
0f534093 RM |
493 | child->thread.debugreg6 = data; |
494 | break; | |
495 | ||
496 | case 7: | |
d9771e8c RM |
497 | /* |
498 | * Sanity-check data. Take one half-byte at once with | |
499 | * check = (val >> (16 + 4*i)) & 0xf. It contains the | |
500 | * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits | |
501 | * 2 and 3 are LENi. Given a list of invalid values, | |
502 | * we do mask |= 1 << invalid_value, so that | |
503 | * (mask >> check) & 1 is a correct test for invalid | |
504 | * values. | |
505 | * | |
506 | * R/Wi contains the type of the breakpoint / | |
507 | * watchpoint, LENi contains the length of the watched | |
508 | * data in the watchpoint case. | |
509 | * | |
510 | * The invalid values are: | |
2047b08b | 511 | * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
d9771e8c RM |
512 | * - R/Wi == 0x10 (break on I/O reads or writes), so |
513 | * mask |= 0x4444. | |
514 | * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= | |
515 | * 0x1110. | |
516 | * | |
517 | * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. | |
518 | * | |
519 | * See the Intel Manual "System Programming Guide", | |
520 | * 15.2.4 | |
521 | * | |
522 | * Note that LENi == 0x10 is defined on x86_64 in long | |
523 | * mode (i.e. even for 32-bit userspace software, but | |
524 | * 64-bit kernel), so the x86_64 mask value is 0x5454. | |
525 | * See the AMD manual no. 24593 (AMD64 System Programming) | |
526 | */ | |
2047b08b RM |
527 | #ifdef CONFIG_X86_32 |
528 | #define DR7_MASK 0x5f54 | |
529 | #else | |
530 | #define DR7_MASK 0x5554 | |
531 | #endif | |
d9771e8c RM |
532 | data &= ~DR_CONTROL_RESERVED; |
533 | for (i = 0; i < 4; i++) | |
2047b08b | 534 | if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
d9771e8c | 535 | return -EIO; |
0f534093 | 536 | child->thread.debugreg7 = data; |
d9771e8c RM |
537 | if (data) |
538 | set_tsk_thread_flag(child, TIF_DEBUG); | |
539 | else | |
540 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
0f534093 | 541 | break; |
d9771e8c RM |
542 | } |
543 | ||
d9771e8c RM |
544 | return 0; |
545 | } | |
546 | ||
a95d67f8 | 547 | static int ptrace_bts_get_size(struct task_struct *child) |
eee3af4a MM |
548 | { |
549 | if (!child->thread.ds_area_msr) | |
550 | return -ENXIO; | |
551 | ||
a95d67f8 | 552 | return ds_get_bts_index((void *)child->thread.ds_area_msr); |
eee3af4a MM |
553 | } |
554 | ||
eee3af4a MM |
555 | static int ptrace_bts_read_record(struct task_struct *child, |
556 | long index, | |
557 | struct bts_struct __user *out) | |
558 | { | |
559 | struct bts_struct ret; | |
560 | int retval; | |
a95d67f8 | 561 | int bts_end; |
e4811f25 | 562 | int bts_index; |
eee3af4a MM |
563 | |
564 | if (!child->thread.ds_area_msr) | |
565 | return -ENXIO; | |
566 | ||
e4811f25 MM |
567 | if (index < 0) |
568 | return -EINVAL; | |
569 | ||
a95d67f8 MM |
570 | bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr); |
571 | if (bts_end <= index) | |
e4811f25 MM |
572 | return -EINVAL; |
573 | ||
574 | /* translate the ptrace bts index into the ds bts index */ | |
575 | bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr); | |
576 | bts_index -= (index + 1); | |
577 | if (bts_index < 0) | |
a95d67f8 | 578 | bts_index += bts_end; |
e4811f25 | 579 | |
eee3af4a | 580 | retval = ds_read_bts((void *)child->thread.ds_area_msr, |
e4811f25 | 581 | bts_index, &ret); |
e6ae5d95 | 582 | if (retval < 0) |
eee3af4a MM |
583 | return retval; |
584 | ||
585 | if (copy_to_user(out, &ret, sizeof(ret))) | |
586 | return -EFAULT; | |
587 | ||
588 | return sizeof(ret); | |
589 | } | |
590 | ||
591 | static int ptrace_bts_write_record(struct task_struct *child, | |
592 | const struct bts_struct *in) | |
593 | { | |
594 | int retval; | |
595 | ||
596 | if (!child->thread.ds_area_msr) | |
597 | return -ENXIO; | |
598 | ||
599 | retval = ds_write_bts((void *)child->thread.ds_area_msr, in); | |
600 | if (retval) | |
601 | return retval; | |
602 | ||
603 | return sizeof(*in); | |
604 | } | |
605 | ||
a95d67f8 | 606 | static int ptrace_bts_clear(struct task_struct *child) |
eee3af4a | 607 | { |
a95d67f8 MM |
608 | if (!child->thread.ds_area_msr) |
609 | return -ENXIO; | |
eee3af4a | 610 | |
a95d67f8 MM |
611 | return ds_clear((void *)child->thread.ds_area_msr); |
612 | } | |
613 | ||
614 | static int ptrace_bts_drain(struct task_struct *child, | |
cba4b65d | 615 | long size, |
a95d67f8 MM |
616 | struct bts_struct __user *out) |
617 | { | |
618 | int end, i; | |
619 | void *ds = (void *)child->thread.ds_area_msr; | |
620 | ||
621 | if (!ds) | |
eee3af4a MM |
622 | return -ENXIO; |
623 | ||
a95d67f8 MM |
624 | end = ds_get_bts_index(ds); |
625 | if (end <= 0) | |
626 | return end; | |
627 | ||
cba4b65d MM |
628 | if (size < (end * sizeof(struct bts_struct))) |
629 | return -EIO; | |
630 | ||
a95d67f8 MM |
631 | for (i = 0; i < end; i++, out++) { |
632 | struct bts_struct ret; | |
633 | int retval; | |
634 | ||
635 | retval = ds_read_bts(ds, i, &ret); | |
636 | if (retval < 0) | |
637 | return retval; | |
638 | ||
639 | if (copy_to_user(out, &ret, sizeof(ret))) | |
640 | return -EFAULT; | |
641 | } | |
642 | ||
643 | ds_clear(ds); | |
644 | ||
cba4b65d | 645 | return end; |
a95d67f8 MM |
646 | } |
647 | ||
da35c371 MM |
648 | static int ptrace_bts_realloc(struct task_struct *child, |
649 | int size, int reduce_size) | |
650 | { | |
651 | unsigned long rlim, vm; | |
652 | int ret, old_size; | |
653 | ||
654 | if (size < 0) | |
655 | return -EINVAL; | |
656 | ||
657 | old_size = ds_get_bts_size((void *)child->thread.ds_area_msr); | |
658 | if (old_size < 0) | |
659 | return old_size; | |
660 | ||
661 | ret = ds_free((void **)&child->thread.ds_area_msr); | |
662 | if (ret < 0) | |
663 | goto out; | |
664 | ||
665 | size >>= PAGE_SHIFT; | |
666 | old_size >>= PAGE_SHIFT; | |
667 | ||
668 | current->mm->total_vm -= old_size; | |
669 | current->mm->locked_vm -= old_size; | |
670 | ||
671 | if (size == 0) | |
672 | goto out; | |
673 | ||
674 | rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT; | |
675 | vm = current->mm->total_vm + size; | |
676 | if (rlim < vm) { | |
677 | ret = -ENOMEM; | |
678 | ||
679 | if (!reduce_size) | |
680 | goto out; | |
681 | ||
682 | size = rlim - current->mm->total_vm; | |
683 | if (size <= 0) | |
684 | goto out; | |
685 | } | |
686 | ||
687 | rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; | |
688 | vm = current->mm->locked_vm + size; | |
689 | if (rlim < vm) { | |
690 | ret = -ENOMEM; | |
691 | ||
692 | if (!reduce_size) | |
693 | goto out; | |
694 | ||
695 | size = rlim - current->mm->locked_vm; | |
696 | if (size <= 0) | |
697 | goto out; | |
698 | } | |
699 | ||
700 | ret = ds_allocate((void **)&child->thread.ds_area_msr, | |
701 | size << PAGE_SHIFT); | |
702 | if (ret < 0) | |
703 | goto out; | |
704 | ||
705 | current->mm->total_vm += size; | |
706 | current->mm->locked_vm += size; | |
707 | ||
708 | out: | |
709 | if (child->thread.ds_area_msr) | |
710 | set_tsk_thread_flag(child, TIF_DS_AREA_MSR); | |
711 | else | |
712 | clear_tsk_thread_flag(child, TIF_DS_AREA_MSR); | |
713 | ||
714 | return ret; | |
715 | } | |
716 | ||
a95d67f8 | 717 | static int ptrace_bts_config(struct task_struct *child, |
cba4b65d | 718 | long cfg_size, |
a95d67f8 MM |
719 | const struct ptrace_bts_config __user *ucfg) |
720 | { | |
721 | struct ptrace_bts_config cfg; | |
da35c371 | 722 | int bts_size, ret = 0; |
a95d67f8 MM |
723 | void *ds; |
724 | ||
cba4b65d MM |
725 | if (cfg_size < sizeof(cfg)) |
726 | return -EIO; | |
727 | ||
a95d67f8 MM |
728 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
729 | return -EFAULT; | |
730 | ||
cba4b65d MM |
731 | if ((int)cfg.size < 0) |
732 | return -EINVAL; | |
733 | ||
a95d67f8 MM |
734 | bts_size = 0; |
735 | ds = (void *)child->thread.ds_area_msr; | |
736 | if (ds) { | |
737 | bts_size = ds_get_bts_size(ds); | |
738 | if (bts_size < 0) | |
739 | return bts_size; | |
740 | } | |
da35c371 | 741 | cfg.size = PAGE_ALIGN(cfg.size); |
a95d67f8 MM |
742 | |
743 | if (bts_size != cfg.size) { | |
da35c371 MM |
744 | ret = ptrace_bts_realloc(child, cfg.size, |
745 | cfg.flags & PTRACE_BTS_O_CUT_SIZE); | |
a95d67f8 | 746 | if (ret < 0) |
da35c371 | 747 | goto errout; |
a95d67f8 | 748 | |
a95d67f8 | 749 | ds = (void *)child->thread.ds_area_msr; |
a95d67f8 MM |
750 | } |
751 | ||
da35c371 MM |
752 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) |
753 | ret = ds_set_overflow(ds, DS_O_SIGNAL); | |
754 | else | |
755 | ret = ds_set_overflow(ds, DS_O_WRAP); | |
756 | if (ret < 0) | |
757 | goto errout; | |
eee3af4a | 758 | |
da35c371 MM |
759 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
760 | child->thread.debugctlmsr |= ds_debugctl_mask(); | |
761 | else | |
762 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); | |
eee3af4a | 763 | |
da35c371 | 764 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
eee3af4a MM |
765 | set_tsk_thread_flag(child, TIF_BTS_TRACE_TS); |
766 | else | |
767 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
768 | ||
cba4b65d MM |
769 | ret = sizeof(cfg); |
770 | ||
da35c371 MM |
771 | out: |
772 | if (child->thread.debugctlmsr) | |
773 | set_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
774 | else | |
775 | clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
776 | ||
777 | return ret; | |
778 | ||
779 | errout: | |
780 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); | |
781 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
782 | goto out; | |
eee3af4a MM |
783 | } |
784 | ||
a95d67f8 | 785 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 786 | long cfg_size, |
a95d67f8 | 787 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 788 | { |
a95d67f8 MM |
789 | void *ds = (void *)child->thread.ds_area_msr; |
790 | struct ptrace_bts_config cfg; | |
eee3af4a | 791 | |
cba4b65d MM |
792 | if (cfg_size < sizeof(cfg)) |
793 | return -EIO; | |
794 | ||
a95d67f8 | 795 | memset(&cfg, 0, sizeof(cfg)); |
eee3af4a | 796 | |
a95d67f8 MM |
797 | if (ds) { |
798 | cfg.size = ds_get_bts_size(ds); | |
eee3af4a | 799 | |
a95d67f8 MM |
800 | if (ds_get_overflow(ds) == DS_O_SIGNAL) |
801 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 802 | |
a95d67f8 MM |
803 | if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) && |
804 | child->thread.debugctlmsr & ds_debugctl_mask()) | |
805 | cfg.flags |= PTRACE_BTS_O_TRACE; | |
eee3af4a | 806 | |
a95d67f8 MM |
807 | if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS)) |
808 | cfg.flags |= PTRACE_BTS_O_SCHED; | |
eee3af4a MM |
809 | } |
810 | ||
87e8407f MM |
811 | cfg.bts_size = sizeof(struct bts_struct); |
812 | ||
a95d67f8 MM |
813 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
814 | return -EFAULT; | |
eee3af4a | 815 | |
a95d67f8 | 816 | return sizeof(cfg); |
eee3af4a MM |
817 | } |
818 | ||
819 | void ptrace_bts_take_timestamp(struct task_struct *tsk, | |
820 | enum bts_qualifier qualifier) | |
821 | { | |
822 | struct bts_struct rec = { | |
823 | .qualifier = qualifier, | |
da35c371 | 824 | .variant.jiffies = jiffies_64 |
eee3af4a MM |
825 | }; |
826 | ||
eee3af4a MM |
827 | ptrace_bts_write_record(tsk, &rec); |
828 | } | |
829 | ||
1da177e4 LT |
830 | /* |
831 | * Called by kernel/ptrace.c when detaching.. | |
832 | * | |
833 | * Make sure the single step bit is not set. | |
834 | */ | |
835 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 836 | { |
7f232343 | 837 | user_disable_single_step(child); |
e9c86c78 | 838 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 839 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 840 | #endif |
eee3af4a | 841 | if (child->thread.ds_area_msr) { |
da35c371 MM |
842 | ptrace_bts_realloc(child, 0, 0); |
843 | child->thread.debugctlmsr &= ~ds_debugctl_mask(); | |
844 | if (!child->thread.debugctlmsr) | |
845 | clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR); | |
846 | clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS); | |
eee3af4a | 847 | } |
1da177e4 LT |
848 | } |
849 | ||
5a4646a4 RM |
850 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
851 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
852 | #endif | |
853 | ||
481bed45 | 854 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 855 | { |
5a4646a4 | 856 | int ret; |
1da177e4 LT |
857 | unsigned long __user *datap = (unsigned long __user *)data; |
858 | ||
1da177e4 | 859 | switch (request) { |
1da177e4 LT |
860 | /* read the word at location addr in the USER area. */ |
861 | case PTRACE_PEEKUSR: { | |
862 | unsigned long tmp; | |
863 | ||
864 | ret = -EIO; | |
e9c86c78 RM |
865 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
866 | addr >= sizeof(struct user)) | |
1da177e4 LT |
867 | break; |
868 | ||
869 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 870 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 871 | tmp = getreg(child, addr); |
e9c86c78 RM |
872 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
873 | addr <= offsetof(struct user, u_debugreg[7])) { | |
874 | addr -= offsetof(struct user, u_debugreg[0]); | |
875 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
876 | } |
877 | ret = put_user(tmp, datap); | |
878 | break; | |
879 | } | |
880 | ||
1da177e4 LT |
881 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
882 | ret = -EIO; | |
e9c86c78 RM |
883 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
884 | addr >= sizeof(struct user)) | |
1da177e4 LT |
885 | break; |
886 | ||
e9c86c78 | 887 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 888 | ret = putreg(child, addr, data); |
e9c86c78 RM |
889 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
890 | addr <= offsetof(struct user, u_debugreg[7])) { | |
891 | addr -= offsetof(struct user, u_debugreg[0]); | |
892 | ret = ptrace_set_debugreg(child, | |
893 | addr / sizeof(data), data); | |
1da177e4 | 894 | } |
e9c86c78 | 895 | break; |
1da177e4 | 896 | |
5a4646a4 RM |
897 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
898 | return copy_regset_to_user(child, | |
899 | task_user_regset_view(current), | |
900 | REGSET_GENERAL, | |
901 | 0, sizeof(struct user_regs_struct), | |
902 | datap); | |
903 | ||
904 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
905 | return copy_regset_from_user(child, | |
906 | task_user_regset_view(current), | |
907 | REGSET_GENERAL, | |
908 | 0, sizeof(struct user_regs_struct), | |
909 | datap); | |
910 | ||
911 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
912 | return copy_regset_to_user(child, | |
913 | task_user_regset_view(current), | |
914 | REGSET_FP, | |
915 | 0, sizeof(struct user_i387_struct), | |
916 | datap); | |
917 | ||
918 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
919 | return copy_regset_from_user(child, | |
920 | task_user_regset_view(current), | |
921 | REGSET_FP, | |
922 | 0, sizeof(struct user_i387_struct), | |
923 | datap); | |
1da177e4 | 924 | |
e9c86c78 | 925 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
926 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
927 | return copy_regset_to_user(child, &user_x86_32_view, | |
928 | REGSET_XFP, | |
929 | 0, sizeof(struct user_fxsr_struct), | |
930 | datap); | |
931 | ||
932 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
933 | return copy_regset_from_user(child, &user_x86_32_view, | |
934 | REGSET_XFP, | |
935 | 0, sizeof(struct user_fxsr_struct), | |
936 | datap); | |
e9c86c78 | 937 | #endif |
1da177e4 | 938 | |
e9c86c78 | 939 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 940 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
941 | if (addr < 0) |
942 | return -EIO; | |
943 | ret = do_get_thread_area(child, addr, | |
944 | (struct user_desc __user *) data); | |
1da177e4 LT |
945 | break; |
946 | ||
947 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
948 | if (addr < 0) |
949 | return -EIO; | |
950 | ret = do_set_thread_area(child, addr, | |
951 | (struct user_desc __user *) data, 0); | |
1da177e4 | 952 | break; |
e9c86c78 RM |
953 | #endif |
954 | ||
955 | #ifdef CONFIG_X86_64 | |
956 | /* normal 64bit interface to access TLS data. | |
957 | Works just like arch_prctl, except that the arguments | |
958 | are reversed. */ | |
959 | case PTRACE_ARCH_PRCTL: | |
960 | ret = do_arch_prctl(child, data, addr); | |
961 | break; | |
962 | #endif | |
1da177e4 | 963 | |
a95d67f8 MM |
964 | case PTRACE_BTS_CONFIG: |
965 | ret = ptrace_bts_config | |
cba4b65d | 966 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
967 | break; |
968 | ||
a95d67f8 MM |
969 | case PTRACE_BTS_STATUS: |
970 | ret = ptrace_bts_status | |
cba4b65d | 971 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
972 | break; |
973 | ||
a95d67f8 MM |
974 | case PTRACE_BTS_SIZE: |
975 | ret = ptrace_bts_get_size(child); | |
eee3af4a MM |
976 | break; |
977 | ||
a95d67f8 | 978 | case PTRACE_BTS_GET: |
eee3af4a | 979 | ret = ptrace_bts_read_record |
a95d67f8 | 980 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
981 | break; |
982 | ||
a95d67f8 MM |
983 | case PTRACE_BTS_CLEAR: |
984 | ret = ptrace_bts_clear(child); | |
eee3af4a MM |
985 | break; |
986 | ||
a95d67f8 MM |
987 | case PTRACE_BTS_DRAIN: |
988 | ret = ptrace_bts_drain | |
cba4b65d | 989 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
990 | break; |
991 | ||
1da177e4 LT |
992 | default: |
993 | ret = ptrace_request(child, request, addr, data); | |
994 | break; | |
995 | } | |
d9771e8c | 996 | |
1da177e4 LT |
997 | return ret; |
998 | } | |
999 | ||
cb757c41 RM |
1000 | #ifdef CONFIG_IA32_EMULATION |
1001 | ||
099cd6e9 RM |
1002 | #include <linux/compat.h> |
1003 | #include <linux/syscalls.h> | |
1004 | #include <asm/ia32.h> | |
cb757c41 RM |
1005 | #include <asm/user32.h> |
1006 | ||
1007 | #define R32(l,q) \ | |
1008 | case offsetof(struct user32, regs.l): \ | |
1009 | regs->q = value; break | |
1010 | ||
1011 | #define SEG32(rs) \ | |
1012 | case offsetof(struct user32, regs.rs): \ | |
1013 | return set_segment_reg(child, \ | |
1014 | offsetof(struct user_regs_struct, rs), \ | |
1015 | value); \ | |
1016 | break | |
1017 | ||
1018 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1019 | { | |
1020 | struct pt_regs *regs = task_pt_regs(child); | |
1021 | ||
1022 | switch (regno) { | |
1023 | ||
1024 | SEG32(cs); | |
1025 | SEG32(ds); | |
1026 | SEG32(es); | |
1027 | SEG32(fs); | |
1028 | SEG32(gs); | |
1029 | SEG32(ss); | |
1030 | ||
1031 | R32(ebx, bx); | |
1032 | R32(ecx, cx); | |
1033 | R32(edx, dx); | |
1034 | R32(edi, di); | |
1035 | R32(esi, si); | |
1036 | R32(ebp, bp); | |
1037 | R32(eax, ax); | |
1038 | R32(orig_eax, orig_ax); | |
1039 | R32(eip, ip); | |
1040 | R32(esp, sp); | |
1041 | ||
1042 | case offsetof(struct user32, regs.eflags): | |
1043 | return set_flags(child, value); | |
1044 | ||
1045 | case offsetof(struct user32, u_debugreg[0]) ... | |
1046 | offsetof(struct user32, u_debugreg[7]): | |
1047 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1048 | return ptrace_set_debugreg(child, regno / 4, value); | |
1049 | ||
1050 | default: | |
1051 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1052 | return -EIO; | |
1053 | ||
1054 | /* | |
1055 | * Other dummy fields in the virtual user structure | |
1056 | * are ignored | |
1057 | */ | |
1058 | break; | |
1059 | } | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | #undef R32 | |
1064 | #undef SEG32 | |
1065 | ||
1066 | #define R32(l,q) \ | |
1067 | case offsetof(struct user32, regs.l): \ | |
1068 | *val = regs->q; break | |
1069 | ||
1070 | #define SEG32(rs) \ | |
1071 | case offsetof(struct user32, regs.rs): \ | |
1072 | *val = get_segment_reg(child, \ | |
1073 | offsetof(struct user_regs_struct, rs)); \ | |
1074 | break | |
1075 | ||
1076 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1077 | { | |
1078 | struct pt_regs *regs = task_pt_regs(child); | |
1079 | ||
1080 | switch (regno) { | |
1081 | ||
1082 | SEG32(ds); | |
1083 | SEG32(es); | |
1084 | SEG32(fs); | |
1085 | SEG32(gs); | |
1086 | ||
1087 | R32(cs, cs); | |
1088 | R32(ss, ss); | |
1089 | R32(ebx, bx); | |
1090 | R32(ecx, cx); | |
1091 | R32(edx, dx); | |
1092 | R32(edi, di); | |
1093 | R32(esi, si); | |
1094 | R32(ebp, bp); | |
1095 | R32(eax, ax); | |
1096 | R32(orig_eax, orig_ax); | |
1097 | R32(eip, ip); | |
1098 | R32(esp, sp); | |
1099 | ||
1100 | case offsetof(struct user32, regs.eflags): | |
1101 | *val = get_flags(child); | |
1102 | break; | |
1103 | ||
1104 | case offsetof(struct user32, u_debugreg[0]) ... | |
1105 | offsetof(struct user32, u_debugreg[7]): | |
1106 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1107 | *val = ptrace_get_debugreg(child, regno / 4); | |
1108 | break; | |
1109 | ||
1110 | default: | |
1111 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1112 | return -EIO; | |
1113 | ||
1114 | /* | |
1115 | * Other dummy fields in the virtual user structure | |
1116 | * are ignored | |
1117 | */ | |
1118 | *val = 0; | |
1119 | break; | |
1120 | } | |
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | #undef R32 | |
1125 | #undef SEG32 | |
1126 | ||
91e7b707 RM |
1127 | static int genregs32_get(struct task_struct *target, |
1128 | const struct user_regset *regset, | |
1129 | unsigned int pos, unsigned int count, | |
1130 | void *kbuf, void __user *ubuf) | |
1131 | { | |
1132 | if (kbuf) { | |
1133 | compat_ulong_t *k = kbuf; | |
1134 | while (count > 0) { | |
1135 | getreg32(target, pos, k++); | |
1136 | count -= sizeof(*k); | |
1137 | pos += sizeof(*k); | |
1138 | } | |
1139 | } else { | |
1140 | compat_ulong_t __user *u = ubuf; | |
1141 | while (count > 0) { | |
1142 | compat_ulong_t word; | |
1143 | getreg32(target, pos, &word); | |
1144 | if (__put_user(word, u++)) | |
1145 | return -EFAULT; | |
1146 | count -= sizeof(*u); | |
1147 | pos += sizeof(*u); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static int genregs32_set(struct task_struct *target, | |
1155 | const struct user_regset *regset, | |
1156 | unsigned int pos, unsigned int count, | |
1157 | const void *kbuf, const void __user *ubuf) | |
1158 | { | |
1159 | int ret = 0; | |
1160 | if (kbuf) { | |
1161 | const compat_ulong_t *k = kbuf; | |
1162 | while (count > 0 && !ret) { | |
1163 | ret = putreg(target, pos, *k++); | |
1164 | count -= sizeof(*k); | |
1165 | pos += sizeof(*k); | |
1166 | } | |
1167 | } else { | |
1168 | const compat_ulong_t __user *u = ubuf; | |
1169 | while (count > 0 && !ret) { | |
1170 | compat_ulong_t word; | |
1171 | ret = __get_user(word, u++); | |
1172 | if (ret) | |
1173 | break; | |
1174 | ret = putreg(target, pos, word); | |
1175 | count -= sizeof(*u); | |
1176 | pos += sizeof(*u); | |
1177 | } | |
1178 | } | |
1179 | return ret; | |
1180 | } | |
1181 | ||
099cd6e9 RM |
1182 | static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data) |
1183 | { | |
1184 | siginfo_t __user *si = compat_alloc_user_space(sizeof(siginfo_t)); | |
1185 | compat_siginfo_t __user *si32 = compat_ptr(data); | |
1186 | siginfo_t ssi; | |
1187 | int ret; | |
1188 | ||
1189 | if (request == PTRACE_SETSIGINFO) { | |
1190 | memset(&ssi, 0, sizeof(siginfo_t)); | |
1191 | ret = copy_siginfo_from_user32(&ssi, si32); | |
1192 | if (ret) | |
1193 | return ret; | |
1194 | if (copy_to_user(si, &ssi, sizeof(siginfo_t))) | |
1195 | return -EFAULT; | |
1196 | } | |
1197 | ret = sys_ptrace(request, pid, addr, (unsigned long)si); | |
1198 | if (ret) | |
1199 | return ret; | |
1200 | if (request == PTRACE_GETSIGINFO) { | |
1201 | if (copy_from_user(&ssi, si, sizeof(siginfo_t))) | |
1202 | return -EFAULT; | |
1203 | ret = copy_siginfo_to_user32(si32, &ssi); | |
1204 | } | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data) | |
1209 | { | |
1210 | struct task_struct *child; | |
1211 | struct pt_regs *childregs; | |
1212 | void __user *datap = compat_ptr(data); | |
1213 | int ret; | |
1214 | __u32 val; | |
1215 | ||
1216 | switch (request) { | |
1217 | case PTRACE_TRACEME: | |
1218 | case PTRACE_ATTACH: | |
1219 | case PTRACE_KILL: | |
1220 | case PTRACE_CONT: | |
1221 | case PTRACE_SINGLESTEP: | |
1222 | case PTRACE_SINGLEBLOCK: | |
1223 | case PTRACE_DETACH: | |
1224 | case PTRACE_SYSCALL: | |
1225 | case PTRACE_OLDSETOPTIONS: | |
1226 | case PTRACE_SETOPTIONS: | |
1227 | case PTRACE_SET_THREAD_AREA: | |
1228 | case PTRACE_GET_THREAD_AREA: | |
eee3af4a MM |
1229 | case PTRACE_BTS_CONFIG: |
1230 | case PTRACE_BTS_STATUS: | |
a95d67f8 MM |
1231 | case PTRACE_BTS_SIZE: |
1232 | case PTRACE_BTS_GET: | |
1233 | case PTRACE_BTS_CLEAR: | |
1234 | case PTRACE_BTS_DRAIN: | |
099cd6e9 RM |
1235 | return sys_ptrace(request, pid, addr, data); |
1236 | ||
1237 | default: | |
1238 | return -EINVAL; | |
1239 | ||
1240 | case PTRACE_PEEKTEXT: | |
1241 | case PTRACE_PEEKDATA: | |
1242 | case PTRACE_POKEDATA: | |
1243 | case PTRACE_POKETEXT: | |
1244 | case PTRACE_POKEUSR: | |
1245 | case PTRACE_PEEKUSR: | |
1246 | case PTRACE_GETREGS: | |
1247 | case PTRACE_SETREGS: | |
1248 | case PTRACE_SETFPREGS: | |
1249 | case PTRACE_GETFPREGS: | |
1250 | case PTRACE_SETFPXREGS: | |
1251 | case PTRACE_GETFPXREGS: | |
1252 | case PTRACE_GETEVENTMSG: | |
1253 | break; | |
1254 | ||
1255 | case PTRACE_SETSIGINFO: | |
1256 | case PTRACE_GETSIGINFO: | |
1257 | return ptrace32_siginfo(request, pid, addr, data); | |
1258 | } | |
1259 | ||
1260 | child = ptrace_get_task_struct(pid); | |
1261 | if (IS_ERR(child)) | |
1262 | return PTR_ERR(child); | |
1263 | ||
1264 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
1265 | if (ret < 0) | |
1266 | goto out; | |
1267 | ||
1268 | childregs = task_pt_regs(child); | |
1269 | ||
1270 | switch (request) { | |
099cd6e9 RM |
1271 | case PTRACE_PEEKUSR: |
1272 | ret = getreg32(child, addr, &val); | |
1273 | if (ret == 0) | |
1274 | ret = put_user(val, (__u32 __user *)datap); | |
1275 | break; | |
1276 | ||
1277 | case PTRACE_POKEUSR: | |
1278 | ret = putreg32(child, addr, data); | |
1279 | break; | |
1280 | ||
5a4646a4 RM |
1281 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1282 | return copy_regset_to_user(child, &user_x86_32_view, | |
1283 | REGSET_GENERAL, | |
1284 | 0, sizeof(struct user_regs_struct32), | |
1285 | datap); | |
1286 | ||
1287 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1288 | return copy_regset_from_user(child, &user_x86_32_view, | |
1289 | REGSET_GENERAL, 0, | |
1290 | sizeof(struct user_regs_struct32), | |
1291 | datap); | |
1292 | ||
1293 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1294 | return copy_regset_to_user(child, &user_x86_32_view, | |
1295 | REGSET_FP, 0, | |
1296 | sizeof(struct user_i387_ia32_struct), | |
1297 | datap); | |
1298 | ||
1299 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1300 | return copy_regset_from_user( | |
1301 | child, &user_x86_32_view, REGSET_FP, | |
1302 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1303 | ||
1304 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1305 | return copy_regset_to_user(child, &user_x86_32_view, | |
1306 | REGSET_XFP, 0, | |
1307 | sizeof(struct user32_fxsr_struct), | |
1308 | datap); | |
1309 | ||
1310 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1311 | return copy_regset_from_user(child, &user_x86_32_view, | |
1312 | REGSET_XFP, 0, | |
1313 | sizeof(struct user32_fxsr_struct), | |
1314 | datap); | |
099cd6e9 | 1315 | |
099cd6e9 | 1316 | default: |
fdadd54d | 1317 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1318 | } |
1319 | ||
1320 | out: | |
1321 | put_task_struct(child); | |
1322 | return ret; | |
1323 | } | |
1324 | ||
cb757c41 RM |
1325 | #endif /* CONFIG_IA32_EMULATION */ |
1326 | ||
070459d9 RM |
1327 | #ifdef CONFIG_X86_64 |
1328 | ||
1329 | static const struct user_regset x86_64_regsets[] = { | |
1330 | [REGSET_GENERAL] = { | |
1331 | .core_note_type = NT_PRSTATUS, | |
1332 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1333 | .size = sizeof(long), .align = sizeof(long), | |
1334 | .get = genregs_get, .set = genregs_set | |
1335 | }, | |
1336 | [REGSET_FP] = { | |
1337 | .core_note_type = NT_PRFPREG, | |
1338 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1339 | .size = sizeof(long), .align = sizeof(long), | |
1340 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1341 | }, | |
1342 | }; | |
1343 | ||
1344 | static const struct user_regset_view user_x86_64_view = { | |
1345 | .name = "x86_64", .e_machine = EM_X86_64, | |
1346 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1347 | }; | |
1348 | ||
1349 | #else /* CONFIG_X86_32 */ | |
1350 | ||
1351 | #define user_regs_struct32 user_regs_struct | |
1352 | #define genregs32_get genregs_get | |
1353 | #define genregs32_set genregs_set | |
1354 | ||
1355 | #endif /* CONFIG_X86_64 */ | |
1356 | ||
1357 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1358 | static const struct user_regset x86_32_regsets[] = { | |
1359 | [REGSET_GENERAL] = { | |
1360 | .core_note_type = NT_PRSTATUS, | |
1361 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1362 | .size = sizeof(u32), .align = sizeof(u32), | |
1363 | .get = genregs32_get, .set = genregs32_set | |
1364 | }, | |
1365 | [REGSET_FP] = { | |
1366 | .core_note_type = NT_PRFPREG, | |
1367 | .n = sizeof(struct user_i387_struct) / sizeof(u32), | |
1368 | .size = sizeof(u32), .align = sizeof(u32), | |
1369 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1370 | }, | |
1371 | [REGSET_XFP] = { | |
1372 | .core_note_type = NT_PRXFPREG, | |
1373 | .n = sizeof(struct user_i387_struct) / sizeof(u32), | |
1374 | .size = sizeof(u32), .align = sizeof(u32), | |
1375 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1376 | }, | |
1377 | [REGSET_TLS] = { | |
bb61682b | 1378 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1379 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1380 | .size = sizeof(struct user_desc), | |
1381 | .align = sizeof(struct user_desc), | |
1382 | .active = regset_tls_active, | |
1383 | .get = regset_tls_get, .set = regset_tls_set | |
1384 | }, | |
1385 | }; | |
1386 | ||
1387 | static const struct user_regset_view user_x86_32_view = { | |
1388 | .name = "i386", .e_machine = EM_386, | |
1389 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1390 | }; | |
1391 | #endif | |
1392 | ||
1393 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1394 | { | |
1395 | #ifdef CONFIG_IA32_EMULATION | |
1396 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1397 | #endif | |
1398 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1399 | return &user_x86_32_view; | |
1400 | #endif | |
1401 | #ifdef CONFIG_X86_64 | |
1402 | return &user_x86_64_view; | |
1403 | #endif | |
1404 | } | |
1405 | ||
86976cd8 RM |
1406 | #ifdef CONFIG_X86_32 |
1407 | ||
1da177e4 LT |
1408 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) |
1409 | { | |
1410 | struct siginfo info; | |
1411 | ||
1412 | tsk->thread.trap_no = 1; | |
1413 | tsk->thread.error_code = error_code; | |
1414 | ||
1415 | memset(&info, 0, sizeof(info)); | |
1416 | info.si_signo = SIGTRAP; | |
1417 | info.si_code = TRAP_BRKPT; | |
1418 | ||
65ea5b03 PA |
1419 | /* User-mode ip? */ |
1420 | info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; | |
1da177e4 | 1421 | |
27b46d76 | 1422 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1423 | force_sig_info(SIGTRAP, &info, tsk); |
1424 | } | |
1425 | ||
1426 | /* notification of system call entry/exit | |
1427 | * - triggered by current->work.syscall_trace | |
1428 | */ | |
1429 | __attribute__((regparm(3))) | |
ed75e8d5 | 1430 | int do_syscall_trace(struct pt_regs *regs, int entryexit) |
1da177e4 | 1431 | { |
4c7fc722 AA |
1432 | int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU); |
1433 | /* | |
1434 | * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall | |
1435 | * interception | |
1436 | */ | |
1b38f006 | 1437 | int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP); |
4c7fc722 | 1438 | int ret = 0; |
1b38f006 | 1439 | |
1da177e4 | 1440 | /* do the secure computing check first */ |
4c7fc722 | 1441 | if (!entryexit) |
65ea5b03 | 1442 | secure_computing(regs->orig_ax); |
1da177e4 | 1443 | |
ab1c23c2 BS |
1444 | if (unlikely(current->audit_context)) { |
1445 | if (entryexit) | |
65ea5b03 PA |
1446 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), |
1447 | regs->ax); | |
ab1c23c2 BS |
1448 | /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only |
1449 | * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is | |
1450 | * not used, entry.S will call us only on syscall exit, not | |
1451 | * entry; so when TIF_SYSCALL_AUDIT is used we must avoid | |
1452 | * calling send_sigtrap() on syscall entry. | |
1453 | * | |
1454 | * Note that when PTRACE_SYSEMU_SINGLESTEP is used, | |
1455 | * is_singlestep is false, despite his name, so we will still do | |
1456 | * the correct thing. | |
1457 | */ | |
1458 | else if (is_singlestep) | |
1459 | goto out; | |
1460 | } | |
1da177e4 LT |
1461 | |
1462 | if (!(current->ptrace & PT_PTRACED)) | |
2fd6f58b | 1463 | goto out; |
1da177e4 | 1464 | |
1b38f006 BS |
1465 | /* If a process stops on the 1st tracepoint with SYSCALL_TRACE |
1466 | * and then is resumed with SYSEMU_SINGLESTEP, it will come in | |
1467 | * here. We have to check this and return */ | |
1468 | if (is_sysemu && entryexit) | |
1469 | return 0; | |
ed75e8d5 | 1470 | |
1da177e4 | 1471 | /* Fake a debug trap */ |
c8c86cec | 1472 | if (is_singlestep) |
1da177e4 LT |
1473 | send_sigtrap(current, regs, 0); |
1474 | ||
c8c86cec | 1475 | if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu) |
2fd6f58b | 1476 | goto out; |
1da177e4 LT |
1477 | |
1478 | /* the 0x80 provides a way for the tracing parent to distinguish | |
1479 | between a syscall stop and SIGTRAP delivery */ | |
ed75e8d5 | 1480 | /* Note that the debugger could change the result of test_thread_flag!*/ |
4c7fc722 | 1481 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0)); |
1da177e4 LT |
1482 | |
1483 | /* | |
1484 | * this isn't the same as continuing with a signal, but it will do | |
1485 | * for normal use. strace only continues with a signal if the | |
1486 | * stopping signal is not SIGTRAP. -brl | |
1487 | */ | |
1488 | if (current->exit_code) { | |
1489 | send_sig(current->exit_code, current, 1); | |
1490 | current->exit_code = 0; | |
1491 | } | |
ed75e8d5 | 1492 | ret = is_sysemu; |
4c7fc722 | 1493 | out: |
2fd6f58b | 1494 | if (unlikely(current->audit_context) && !entryexit) |
65ea5b03 PA |
1495 | audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax, |
1496 | regs->bx, regs->cx, regs->dx, regs->si); | |
c8c86cec BS |
1497 | if (ret == 0) |
1498 | return 0; | |
1499 | ||
65ea5b03 | 1500 | regs->orig_ax = -1; /* force skip of syscall restarting */ |
c8c86cec | 1501 | if (unlikely(current->audit_context)) |
65ea5b03 | 1502 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); |
c8c86cec | 1503 | return 1; |
1da177e4 | 1504 | } |
86976cd8 RM |
1505 | |
1506 | #else /* CONFIG_X86_64 */ | |
1507 | ||
1508 | static void syscall_trace(struct pt_regs *regs) | |
1509 | { | |
1510 | ||
1511 | #if 0 | |
1512 | printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n", | |
1513 | current->comm, | |
1514 | regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0), | |
1515 | current_thread_info()->flags, current->ptrace); | |
1516 | #endif | |
1517 | ||
1518 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
1519 | ? 0x80 : 0)); | |
1520 | /* | |
1521 | * this isn't the same as continuing with a signal, but it will do | |
1522 | * for normal use. strace only continues with a signal if the | |
1523 | * stopping signal is not SIGTRAP. -brl | |
1524 | */ | |
1525 | if (current->exit_code) { | |
1526 | send_sig(current->exit_code, current, 1); | |
1527 | current->exit_code = 0; | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | asmlinkage void syscall_trace_enter(struct pt_regs *regs) | |
1532 | { | |
1533 | /* do the secure computing check first */ | |
1534 | secure_computing(regs->orig_ax); | |
1535 | ||
1536 | if (test_thread_flag(TIF_SYSCALL_TRACE) | |
1537 | && (current->ptrace & PT_PTRACED)) | |
1538 | syscall_trace(regs); | |
1539 | ||
1540 | if (unlikely(current->audit_context)) { | |
1541 | if (test_thread_flag(TIF_IA32)) { | |
1542 | audit_syscall_entry(AUDIT_ARCH_I386, | |
1543 | regs->orig_ax, | |
1544 | regs->bx, regs->cx, | |
1545 | regs->dx, regs->si); | |
1546 | } else { | |
1547 | audit_syscall_entry(AUDIT_ARCH_X86_64, | |
1548 | regs->orig_ax, | |
1549 | regs->di, regs->si, | |
1550 | regs->dx, regs->r10); | |
1551 | } | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | asmlinkage void syscall_trace_leave(struct pt_regs *regs) | |
1556 | { | |
1557 | if (unlikely(current->audit_context)) | |
1558 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1559 | ||
1560 | if ((test_thread_flag(TIF_SYSCALL_TRACE) | |
1561 | || test_thread_flag(TIF_SINGLESTEP)) | |
1562 | && (current->ptrace & PT_PTRACED)) | |
1563 | syscall_trace(regs); | |
1564 | } | |
1565 | ||
1566 | #endif /* CONFIG_X86_32 */ |