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> |
eeea3c3f | 17 | #include <linux/tracehook.h> |
1da177e4 | 18 | #include <linux/user.h> |
070459d9 | 19 | #include <linux/elf.h> |
1da177e4 LT |
20 | #include <linux/security.h> |
21 | #include <linux/audit.h> | |
22 | #include <linux/seccomp.h> | |
7ed20e1a | 23 | #include <linux/signal.h> |
e2b371f0 | 24 | #include <linux/workqueue.h> |
24f1e32c FW |
25 | #include <linux/perf_event.h> |
26 | #include <linux/hw_breakpoint.h> | |
1da177e4 LT |
27 | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/i387.h> | |
33 | #include <asm/debugreg.h> | |
34 | #include <asm/ldt.h> | |
35 | #include <asm/desc.h> | |
2047b08b RM |
36 | #include <asm/prctl.h> |
37 | #include <asm/proto.h> | |
eee3af4a | 38 | #include <asm/ds.h> |
72f674d2 | 39 | #include <asm/hw_breakpoint.h> |
eee3af4a | 40 | |
070459d9 RM |
41 | #include "tls.h" |
42 | ||
1c569f02 JS |
43 | #define CREATE_TRACE_POINTS |
44 | #include <trace/events/syscalls.h> | |
45 | ||
070459d9 RM |
46 | enum x86_regset { |
47 | REGSET_GENERAL, | |
48 | REGSET_FP, | |
49 | REGSET_XFP, | |
325af5fb | 50 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 51 | REGSET_XSTATE, |
070459d9 | 52 | REGSET_TLS, |
325af5fb | 53 | REGSET_IOPERM32, |
070459d9 | 54 | }; |
eee3af4a | 55 | |
b1cf540f MH |
56 | struct pt_regs_offset { |
57 | const char *name; | |
58 | int offset; | |
59 | }; | |
60 | ||
61 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
62 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
63 | ||
64 | static const struct pt_regs_offset regoffset_table[] = { | |
65 | #ifdef CONFIG_X86_64 | |
66 | REG_OFFSET_NAME(r15), | |
67 | REG_OFFSET_NAME(r14), | |
68 | REG_OFFSET_NAME(r13), | |
69 | REG_OFFSET_NAME(r12), | |
70 | REG_OFFSET_NAME(r11), | |
71 | REG_OFFSET_NAME(r10), | |
72 | REG_OFFSET_NAME(r9), | |
73 | REG_OFFSET_NAME(r8), | |
74 | #endif | |
75 | REG_OFFSET_NAME(bx), | |
76 | REG_OFFSET_NAME(cx), | |
77 | REG_OFFSET_NAME(dx), | |
78 | REG_OFFSET_NAME(si), | |
79 | REG_OFFSET_NAME(di), | |
80 | REG_OFFSET_NAME(bp), | |
81 | REG_OFFSET_NAME(ax), | |
82 | #ifdef CONFIG_X86_32 | |
83 | REG_OFFSET_NAME(ds), | |
84 | REG_OFFSET_NAME(es), | |
85 | REG_OFFSET_NAME(fs), | |
86 | REG_OFFSET_NAME(gs), | |
87 | #endif | |
88 | REG_OFFSET_NAME(orig_ax), | |
89 | REG_OFFSET_NAME(ip), | |
90 | REG_OFFSET_NAME(cs), | |
91 | REG_OFFSET_NAME(flags), | |
92 | REG_OFFSET_NAME(sp), | |
93 | REG_OFFSET_NAME(ss), | |
94 | REG_OFFSET_END, | |
95 | }; | |
96 | ||
97 | /** | |
98 | * regs_query_register_offset() - query register offset from its name | |
99 | * @name: the name of a register | |
100 | * | |
101 | * regs_query_register_offset() returns the offset of a register in struct | |
102 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
103 | */ | |
104 | int regs_query_register_offset(const char *name) | |
105 | { | |
106 | const struct pt_regs_offset *roff; | |
107 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
108 | if (!strcmp(roff->name, name)) | |
109 | return roff->offset; | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | /** | |
114 | * regs_query_register_name() - query register name from its offset | |
115 | * @offset: the offset of a register in struct pt_regs. | |
116 | * | |
117 | * regs_query_register_name() returns the name of a register from its | |
118 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
119 | */ | |
120 | const char *regs_query_register_name(unsigned int offset) | |
121 | { | |
122 | const struct pt_regs_offset *roff; | |
123 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
124 | if (roff->offset == offset) | |
125 | return roff->name; | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static const int arg_offs_table[] = { | |
130 | #ifdef CONFIG_X86_32 | |
131 | [0] = offsetof(struct pt_regs, ax), | |
132 | [1] = offsetof(struct pt_regs, dx), | |
133 | [2] = offsetof(struct pt_regs, cx) | |
134 | #else /* CONFIG_X86_64 */ | |
135 | [0] = offsetof(struct pt_regs, di), | |
136 | [1] = offsetof(struct pt_regs, si), | |
137 | [2] = offsetof(struct pt_regs, dx), | |
138 | [3] = offsetof(struct pt_regs, cx), | |
139 | [4] = offsetof(struct pt_regs, r8), | |
140 | [5] = offsetof(struct pt_regs, r9) | |
141 | #endif | |
142 | }; | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * does not yet catch signals sent when the child dies. | |
146 | * in exit.c or in signal.c. | |
147 | */ | |
148 | ||
9f155b98 CE |
149 | /* |
150 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 151 | */ |
e39c2891 RM |
152 | #define FLAG_MASK_32 ((unsigned long) \ |
153 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
154 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
155 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
156 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
157 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
158 | ||
2047b08b RM |
159 | /* |
160 | * Determines whether a value may be installed in a segment register. | |
161 | */ | |
162 | static inline bool invalid_selector(u16 value) | |
163 | { | |
164 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
165 | } | |
166 | ||
167 | #ifdef CONFIG_X86_32 | |
168 | ||
e39c2891 | 169 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 170 | |
4fe702c7 | 171 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 172 | { |
65ea5b03 | 173 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 174 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
175 | } |
176 | ||
06ee1b68 | 177 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 178 | { |
06ee1b68 RM |
179 | /* |
180 | * Returning the value truncates it to 16 bits. | |
181 | */ | |
182 | unsigned int retval; | |
183 | if (offset != offsetof(struct user_regs_struct, gs)) | |
184 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
185 | else { | |
06ee1b68 | 186 | if (task == current) |
d9a89a26 TH |
187 | retval = get_user_gs(task_pt_regs(task)); |
188 | else | |
189 | retval = task_user_gs(task); | |
06ee1b68 RM |
190 | } |
191 | return retval; | |
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 | */ | |
2047b08b | 200 | if (invalid_selector(value)) |
06ee1b68 RM |
201 | return -EIO; |
202 | ||
c63855d0 RM |
203 | /* |
204 | * For %cs and %ss we cannot permit a null selector. | |
205 | * We can permit a bogus selector as long as it has USER_RPL. | |
206 | * Null selectors are fine for other segment registers, but | |
207 | * we will never get back to user mode with invalid %cs or %ss | |
208 | * and will take the trap in iret instead. Much code relies | |
209 | * on user_mode() to distinguish a user trap frame (which can | |
210 | * safely use invalid selectors) from a kernel trap frame. | |
211 | */ | |
212 | switch (offset) { | |
213 | case offsetof(struct user_regs_struct, cs): | |
214 | case offsetof(struct user_regs_struct, ss): | |
215 | if (unlikely(value == 0)) | |
216 | return -EIO; | |
217 | ||
218 | default: | |
06ee1b68 | 219 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
220 | break; |
221 | ||
222 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 223 | if (task == current) |
d9a89a26 TH |
224 | set_user_gs(task_pt_regs(task), value); |
225 | else | |
226 | task_user_gs(task) = value; | |
1da177e4 | 227 | } |
06ee1b68 | 228 | |
1da177e4 LT |
229 | return 0; |
230 | } | |
231 | ||
2047b08b RM |
232 | #else /* CONFIG_X86_64 */ |
233 | ||
234 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
235 | ||
236 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
237 | { | |
238 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
239 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
240 | } | |
241 | ||
242 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
243 | { | |
244 | /* | |
245 | * Returning the value truncates it to 16 bits. | |
246 | */ | |
247 | unsigned int seg; | |
248 | ||
249 | switch (offset) { | |
250 | case offsetof(struct user_regs_struct, fs): | |
251 | if (task == current) { | |
252 | /* Older gas can't assemble movq %?s,%r?? */ | |
253 | asm("movl %%fs,%0" : "=r" (seg)); | |
254 | return seg; | |
255 | } | |
256 | return task->thread.fsindex; | |
257 | case offsetof(struct user_regs_struct, gs): | |
258 | if (task == current) { | |
259 | asm("movl %%gs,%0" : "=r" (seg)); | |
260 | return seg; | |
261 | } | |
262 | return task->thread.gsindex; | |
263 | case offsetof(struct user_regs_struct, ds): | |
264 | if (task == current) { | |
265 | asm("movl %%ds,%0" : "=r" (seg)); | |
266 | return seg; | |
267 | } | |
268 | return task->thread.ds; | |
269 | case offsetof(struct user_regs_struct, es): | |
270 | if (task == current) { | |
271 | asm("movl %%es,%0" : "=r" (seg)); | |
272 | return seg; | |
273 | } | |
274 | return task->thread.es; | |
275 | ||
276 | case offsetof(struct user_regs_struct, cs): | |
277 | case offsetof(struct user_regs_struct, ss): | |
278 | break; | |
279 | } | |
280 | return *pt_regs_access(task_pt_regs(task), offset); | |
281 | } | |
282 | ||
283 | static int set_segment_reg(struct task_struct *task, | |
284 | unsigned long offset, u16 value) | |
285 | { | |
286 | /* | |
287 | * The value argument was already truncated to 16 bits. | |
288 | */ | |
289 | if (invalid_selector(value)) | |
290 | return -EIO; | |
291 | ||
292 | switch (offset) { | |
293 | case offsetof(struct user_regs_struct,fs): | |
294 | /* | |
295 | * If this is setting fs as for normal 64-bit use but | |
296 | * setting fs_base has implicitly changed it, leave it. | |
297 | */ | |
298 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
299 | task->thread.fs != 0) || | |
300 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
301 | task->thread.fs == 0)) | |
302 | break; | |
303 | task->thread.fsindex = value; | |
304 | if (task == current) | |
305 | loadsegment(fs, task->thread.fsindex); | |
306 | break; | |
307 | case offsetof(struct user_regs_struct,gs): | |
308 | /* | |
309 | * If this is setting gs as for normal 64-bit use but | |
310 | * setting gs_base has implicitly changed it, leave it. | |
311 | */ | |
312 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
313 | task->thread.gs != 0) || | |
314 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
315 | task->thread.gs == 0)) | |
316 | break; | |
317 | task->thread.gsindex = value; | |
318 | if (task == current) | |
319 | load_gs_index(task->thread.gsindex); | |
320 | break; | |
321 | case offsetof(struct user_regs_struct,ds): | |
322 | task->thread.ds = value; | |
323 | if (task == current) | |
324 | loadsegment(ds, task->thread.ds); | |
325 | break; | |
326 | case offsetof(struct user_regs_struct,es): | |
327 | task->thread.es = value; | |
328 | if (task == current) | |
329 | loadsegment(es, task->thread.es); | |
330 | break; | |
331 | ||
332 | /* | |
333 | * Can't actually change these in 64-bit mode. | |
334 | */ | |
335 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
336 | if (unlikely(value == 0)) |
337 | return -EIO; | |
2047b08b RM |
338 | #ifdef CONFIG_IA32_EMULATION |
339 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
340 | task_pt_regs(task)->cs = value; | |
2047b08b | 341 | #endif |
cb757c41 | 342 | break; |
2047b08b | 343 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
344 | if (unlikely(value == 0)) |
345 | return -EIO; | |
2047b08b RM |
346 | #ifdef CONFIG_IA32_EMULATION |
347 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
348 | task_pt_regs(task)->ss = value; | |
2047b08b | 349 | #endif |
cb757c41 | 350 | break; |
2047b08b RM |
351 | } |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
2047b08b RM |
356 | #endif /* CONFIG_X86_32 */ |
357 | ||
06ee1b68 | 358 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 359 | { |
06ee1b68 RM |
360 | unsigned long retval = task_pt_regs(task)->flags; |
361 | ||
362 | /* | |
363 | * If the debugger set TF, hide it from the readout. | |
364 | */ | |
365 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
366 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 367 | |
1da177e4 LT |
368 | return retval; |
369 | } | |
370 | ||
06ee1b68 RM |
371 | static int set_flags(struct task_struct *task, unsigned long value) |
372 | { | |
373 | struct pt_regs *regs = task_pt_regs(task); | |
374 | ||
375 | /* | |
376 | * If the user value contains TF, mark that | |
377 | * it was not "us" (the debugger) that set it. | |
378 | * If not, make sure it stays set if we had. | |
379 | */ | |
380 | if (value & X86_EFLAGS_TF) | |
381 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
382 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
383 | value |= X86_EFLAGS_TF; | |
384 | ||
385 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int putreg(struct task_struct *child, | |
391 | unsigned long offset, unsigned long value) | |
392 | { | |
393 | switch (offset) { | |
394 | case offsetof(struct user_regs_struct, cs): | |
395 | case offsetof(struct user_regs_struct, ds): | |
396 | case offsetof(struct user_regs_struct, es): | |
397 | case offsetof(struct user_regs_struct, fs): | |
398 | case offsetof(struct user_regs_struct, gs): | |
399 | case offsetof(struct user_regs_struct, ss): | |
400 | return set_segment_reg(child, offset, value); | |
401 | ||
402 | case offsetof(struct user_regs_struct, flags): | |
403 | return set_flags(child, value); | |
2047b08b RM |
404 | |
405 | #ifdef CONFIG_X86_64 | |
406 | case offsetof(struct user_regs_struct,fs_base): | |
407 | if (value >= TASK_SIZE_OF(child)) | |
408 | return -EIO; | |
409 | /* | |
410 | * When changing the segment base, use do_arch_prctl | |
411 | * to set either thread.fs or thread.fsindex and the | |
412 | * corresponding GDT slot. | |
413 | */ | |
414 | if (child->thread.fs != value) | |
415 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
416 | return 0; | |
417 | case offsetof(struct user_regs_struct,gs_base): | |
418 | /* | |
419 | * Exactly the same here as the %fs handling above. | |
420 | */ | |
421 | if (value >= TASK_SIZE_OF(child)) | |
422 | return -EIO; | |
423 | if (child->thread.gs != value) | |
424 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
425 | return 0; | |
426 | #endif | |
06ee1b68 RM |
427 | } |
428 | ||
429 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
434 | { | |
435 | switch (offset) { | |
436 | case offsetof(struct user_regs_struct, cs): | |
437 | case offsetof(struct user_regs_struct, ds): | |
438 | case offsetof(struct user_regs_struct, es): | |
439 | case offsetof(struct user_regs_struct, fs): | |
440 | case offsetof(struct user_regs_struct, gs): | |
441 | case offsetof(struct user_regs_struct, ss): | |
442 | return get_segment_reg(task, offset); | |
443 | ||
444 | case offsetof(struct user_regs_struct, flags): | |
445 | return get_flags(task); | |
2047b08b RM |
446 | |
447 | #ifdef CONFIG_X86_64 | |
448 | case offsetof(struct user_regs_struct, fs_base): { | |
449 | /* | |
450 | * do_arch_prctl may have used a GDT slot instead of | |
451 | * the MSR. To userland, it appears the same either | |
452 | * way, except the %fs segment selector might not be 0. | |
453 | */ | |
454 | unsigned int seg = task->thread.fsindex; | |
455 | if (task->thread.fs != 0) | |
456 | return task->thread.fs; | |
457 | if (task == current) | |
458 | asm("movl %%fs,%0" : "=r" (seg)); | |
459 | if (seg != FS_TLS_SEL) | |
460 | return 0; | |
461 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
462 | } | |
463 | case offsetof(struct user_regs_struct, gs_base): { | |
464 | /* | |
465 | * Exactly the same here as the %fs handling above. | |
466 | */ | |
467 | unsigned int seg = task->thread.gsindex; | |
468 | if (task->thread.gs != 0) | |
469 | return task->thread.gs; | |
470 | if (task == current) | |
471 | asm("movl %%gs,%0" : "=r" (seg)); | |
472 | if (seg != GS_TLS_SEL) | |
473 | return 0; | |
474 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
475 | } | |
476 | #endif | |
06ee1b68 RM |
477 | } |
478 | ||
479 | return *pt_regs_access(task_pt_regs(task), offset); | |
480 | } | |
481 | ||
91e7b707 RM |
482 | static int genregs_get(struct task_struct *target, |
483 | const struct user_regset *regset, | |
484 | unsigned int pos, unsigned int count, | |
485 | void *kbuf, void __user *ubuf) | |
486 | { | |
487 | if (kbuf) { | |
488 | unsigned long *k = kbuf; | |
04a1e62c | 489 | while (count >= sizeof(*k)) { |
91e7b707 RM |
490 | *k++ = getreg(target, pos); |
491 | count -= sizeof(*k); | |
492 | pos += sizeof(*k); | |
493 | } | |
494 | } else { | |
495 | unsigned long __user *u = ubuf; | |
04a1e62c | 496 | while (count >= sizeof(*u)) { |
91e7b707 RM |
497 | if (__put_user(getreg(target, pos), u++)) |
498 | return -EFAULT; | |
499 | count -= sizeof(*u); | |
500 | pos += sizeof(*u); | |
501 | } | |
502 | } | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static int genregs_set(struct task_struct *target, | |
508 | const struct user_regset *regset, | |
509 | unsigned int pos, unsigned int count, | |
510 | const void *kbuf, const void __user *ubuf) | |
511 | { | |
512 | int ret = 0; | |
513 | if (kbuf) { | |
514 | const unsigned long *k = kbuf; | |
04a1e62c | 515 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
516 | ret = putreg(target, pos, *k++); |
517 | count -= sizeof(*k); | |
518 | pos += sizeof(*k); | |
519 | } | |
520 | } else { | |
521 | const unsigned long __user *u = ubuf; | |
04a1e62c | 522 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
523 | unsigned long word; |
524 | ret = __get_user(word, u++); | |
525 | if (ret) | |
526 | break; | |
527 | ret = putreg(target, pos, word); | |
528 | count -= sizeof(*u); | |
529 | pos += sizeof(*u); | |
530 | } | |
531 | } | |
532 | return ret; | |
533 | } | |
534 | ||
b326e956 FW |
535 | static void ptrace_triggered(struct perf_event *bp, int nmi, |
536 | struct perf_sample_data *data, | |
537 | struct pt_regs *regs) | |
d9771e8c | 538 | { |
0f534093 | 539 | int i; |
24f1e32c | 540 | struct thread_struct *thread = &(current->thread); |
0f534093 | 541 | |
72f674d2 P |
542 | /* |
543 | * Store in the virtual DR6 register the fact that the breakpoint | |
544 | * was hit so the thread's debugger will see it. | |
545 | */ | |
24f1e32c FW |
546 | for (i = 0; i < HBP_NUM; i++) { |
547 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 548 | break; |
24f1e32c | 549 | } |
d9771e8c | 550 | |
72f674d2 P |
551 | thread->debugreg6 |= (DR_TRAP0 << i); |
552 | } | |
d9771e8c | 553 | |
d9771e8c | 554 | /* |
24f1e32c FW |
555 | * Walk through every ptrace breakpoints for this thread and |
556 | * build the dr7 value on top of their attributes. | |
557 | * | |
d9771e8c | 558 | */ |
24f1e32c | 559 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 560 | { |
24f1e32c FW |
561 | int i; |
562 | int dr7 = 0; | |
563 | struct arch_hw_breakpoint *info; | |
564 | ||
565 | for (i = 0; i < HBP_NUM; i++) { | |
566 | if (bp[i] && !bp[i]->attr.disabled) { | |
567 | info = counter_arch_bp(bp[i]); | |
568 | dr7 |= encode_dr7(i, info->len, info->type); | |
569 | } | |
0f534093 | 570 | } |
24f1e32c FW |
571 | |
572 | return dr7; | |
d9771e8c RM |
573 | } |
574 | ||
44234adc | 575 | static int |
5fa10b28 | 576 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
1cedae72 | 577 | struct task_struct *tsk, int disabled) |
5fa10b28 FW |
578 | { |
579 | int err; | |
580 | int gen_len, gen_type; | |
b326e956 | 581 | struct perf_event_attr attr; |
5fa10b28 FW |
582 | |
583 | /* | |
c9404c9c | 584 | * We should have at least an inactive breakpoint at this |
5fa10b28 FW |
585 | * slot. It means the user is writing dr7 without having |
586 | * written the address register first | |
587 | */ | |
588 | if (!bp) | |
44234adc | 589 | return -EINVAL; |
5fa10b28 FW |
590 | |
591 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); | |
592 | if (err) | |
44234adc | 593 | return err; |
5fa10b28 FW |
594 | |
595 | attr = bp->attr; | |
596 | attr.bp_len = gen_len; | |
597 | attr.bp_type = gen_type; | |
1cedae72 | 598 | attr.disabled = disabled; |
5fa10b28 | 599 | |
2f0993e0 | 600 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
601 | } |
602 | ||
72f674d2 P |
603 | /* |
604 | * Handle ptrace writes to debug register 7. | |
605 | */ | |
606 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 607 | { |
72f674d2 | 608 | struct thread_struct *thread = &(tsk->thread); |
24f1e32c | 609 | unsigned long old_dr7; |
72f674d2 P |
610 | int i, orig_ret = 0, rc = 0; |
611 | int enabled, second_pass = 0; | |
612 | unsigned len, type; | |
24f1e32c | 613 | struct perf_event *bp; |
72f674d2 P |
614 | |
615 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 616 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
72f674d2 P |
617 | restore: |
618 | /* | |
619 | * Loop through all the hardware breakpoints, making the | |
620 | * appropriate changes to each. | |
621 | */ | |
622 | for (i = 0; i < HBP_NUM; i++) { | |
623 | enabled = decode_dr7(data, i, &len, &type); | |
24f1e32c | 624 | bp = thread->ptrace_bps[i]; |
72f674d2 P |
625 | |
626 | if (!enabled) { | |
627 | if (bp) { | |
24f1e32c FW |
628 | /* |
629 | * Don't unregister the breakpoints right-away, | |
72f674d2 P |
630 | * unless all register_user_hw_breakpoint() |
631 | * requests have succeeded. This prevents | |
632 | * any window of opportunity for debug | |
633 | * register grabbing by other users. | |
634 | */ | |
635 | if (!second_pass) | |
636 | continue; | |
1cedae72 | 637 | |
44234adc | 638 | rc = ptrace_modify_breakpoint(bp, len, type, |
1cedae72 | 639 | tsk, 1); |
44234adc | 640 | if (rc) |
1cedae72 | 641 | break; |
72f674d2 P |
642 | } |
643 | continue; | |
644 | } | |
0f534093 | 645 | |
44234adc FW |
646 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
647 | if (rc) | |
24f1e32c | 648 | break; |
72f674d2 P |
649 | } |
650 | /* | |
651 | * Make a second pass to free the remaining unused breakpoints | |
652 | * or to restore the original breakpoints if an error occurred. | |
653 | */ | |
654 | if (!second_pass) { | |
655 | second_pass = 1; | |
656 | if (rc < 0) { | |
657 | orig_ret = rc; | |
658 | data = old_dr7; | |
659 | } | |
660 | goto restore; | |
661 | } | |
662 | return ((orig_ret < 0) ? orig_ret : rc); | |
663 | } | |
0f534093 | 664 | |
72f674d2 P |
665 | /* |
666 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
667 | */ | |
9d22b536 | 668 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 P |
669 | { |
670 | struct thread_struct *thread = &(tsk->thread); | |
671 | unsigned long val = 0; | |
672 | ||
24f1e32c FW |
673 | if (n < HBP_NUM) { |
674 | struct perf_event *bp; | |
675 | bp = thread->ptrace_bps[n]; | |
676 | if (!bp) | |
677 | return 0; | |
678 | val = bp->hw.info.address; | |
679 | } else if (n == 6) { | |
72f674d2 | 680 | val = thread->debugreg6; |
24f1e32c | 681 | } else if (n == 7) { |
326264a0 | 682 | val = thread->ptrace_dr7; |
24f1e32c | 683 | } |
72f674d2 P |
684 | return val; |
685 | } | |
0f534093 | 686 | |
24f1e32c FW |
687 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
688 | unsigned long addr) | |
689 | { | |
690 | struct perf_event *bp; | |
691 | struct thread_struct *t = &tsk->thread; | |
b326e956 | 692 | struct perf_event_attr attr; |
24f1e32c FW |
693 | |
694 | if (!t->ptrace_bps[nr]) { | |
b326e956 | 695 | hw_breakpoint_init(&attr); |
d9771e8c | 696 | /* |
24f1e32c FW |
697 | * Put stub len and type to register (reserve) an inactive but |
698 | * correct bp | |
d9771e8c | 699 | */ |
5fa10b28 FW |
700 | attr.bp_addr = addr; |
701 | attr.bp_len = HW_BREAKPOINT_LEN_1; | |
702 | attr.bp_type = HW_BREAKPOINT_W; | |
703 | attr.disabled = 1; | |
704 | ||
705 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk); | |
44234adc FW |
706 | |
707 | /* | |
708 | * CHECKME: the previous code returned -EIO if the addr wasn't | |
709 | * a valid task virtual addr. The new one will return -EINVAL in | |
710 | * this case. | |
711 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
712 | * but -EIO looks better for ptrace, since we refuse a register | |
713 | * writing for the user. And anyway this is the previous | |
714 | * behaviour. | |
715 | */ | |
716 | if (IS_ERR(bp)) | |
717 | return PTR_ERR(bp); | |
718 | ||
719 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 720 | } else { |
44234adc FW |
721 | int err; |
722 | ||
24f1e32c | 723 | bp = t->ptrace_bps[nr]; |
5fa10b28 FW |
724 | |
725 | attr = bp->attr; | |
726 | attr.bp_addr = addr; | |
44234adc FW |
727 | err = modify_user_hw_breakpoint(bp, &attr); |
728 | if (err) | |
729 | return err; | |
d9771e8c | 730 | } |
24f1e32c | 731 | |
24f1e32c | 732 | |
d9771e8c RM |
733 | return 0; |
734 | } | |
735 | ||
72f674d2 P |
736 | /* |
737 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
738 | */ | |
739 | int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val) | |
740 | { | |
741 | struct thread_struct *thread = &(tsk->thread); | |
742 | int rc = 0; | |
743 | ||
744 | /* There are no DR4 or DR5 registers */ | |
745 | if (n == 4 || n == 5) | |
746 | return -EIO; | |
747 | ||
748 | if (n == 6) { | |
24f1e32c | 749 | thread->debugreg6 = val; |
72f674d2 | 750 | goto ret_path; |
d9771e8c | 751 | } |
72f674d2 | 752 | if (n < HBP_NUM) { |
24f1e32c FW |
753 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
754 | if (rc) | |
755 | return rc; | |
72f674d2 P |
756 | } |
757 | /* All that's left is DR7 */ | |
326264a0 | 758 | if (n == 7) { |
72f674d2 | 759 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
760 | if (!rc) |
761 | thread->ptrace_dr7 = val; | |
762 | } | |
d9771e8c | 763 | |
72f674d2 P |
764 | ret_path: |
765 | return rc; | |
d9771e8c RM |
766 | } |
767 | ||
325af5fb RM |
768 | /* |
769 | * These access the current or another (stopped) task's io permission | |
770 | * bitmap for debugging or core dump. | |
771 | */ | |
772 | static int ioperm_active(struct task_struct *target, | |
773 | const struct user_regset *regset) | |
774 | { | |
775 | return target->thread.io_bitmap_max / regset->size; | |
776 | } | |
b4ef95de | 777 | |
325af5fb RM |
778 | static int ioperm_get(struct task_struct *target, |
779 | const struct user_regset *regset, | |
780 | unsigned int pos, unsigned int count, | |
781 | void *kbuf, void __user *ubuf) | |
eee3af4a | 782 | { |
325af5fb | 783 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
784 | return -ENXIO; |
785 | ||
325af5fb RM |
786 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
787 | target->thread.io_bitmap_ptr, | |
788 | 0, IO_BITMAP_BYTES); | |
789 | } | |
790 | ||
93fa7636 | 791 | #ifdef CONFIG_X86_PTRACE_BTS |
e2b371f0 MM |
792 | /* |
793 | * A branch trace store context. | |
794 | * | |
795 | * Contexts may only be installed by ptrace_bts_config() and only for | |
796 | * ptraced tasks. | |
797 | * | |
798 | * Contexts are destroyed when the tracee is detached from the tracer. | |
799 | * The actual destruction work requires interrupts enabled, so the | |
800 | * work is deferred and will be scheduled during __ptrace_unlink(). | |
801 | * | |
802 | * Contexts hold an additional task_struct reference on the traced | |
803 | * task, as well as a reference on the tracer's mm. | |
804 | * | |
805 | * Ptrace already holds a task_struct for the duration of ptrace operations, | |
806 | * but since destruction is deferred, it may be executed after both | |
807 | * tracer and tracee exited. | |
808 | */ | |
809 | struct bts_context { | |
810 | /* The branch trace handle. */ | |
811 | struct bts_tracer *tracer; | |
812 | ||
813 | /* The buffer used to store the branch trace and its size. */ | |
814 | void *buffer; | |
815 | unsigned int size; | |
816 | ||
817 | /* The mm that paid for the above buffer. */ | |
818 | struct mm_struct *mm; | |
819 | ||
820 | /* The task this context belongs to. */ | |
821 | struct task_struct *task; | |
822 | ||
823 | /* The signal to send on a bts buffer overflow. */ | |
824 | unsigned int bts_ovfl_signal; | |
825 | ||
826 | /* The work struct to destroy a context. */ | |
827 | struct work_struct work; | |
828 | }; | |
829 | ||
1cb81b14 | 830 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
e2b371f0 | 831 | { |
1cb81b14 MM |
832 | void *buffer = NULL; |
833 | int err = -ENOMEM; | |
e2b371f0 | 834 | |
1cb81b14 MM |
835 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
836 | if (err < 0) | |
837 | return err; | |
838 | ||
839 | buffer = kzalloc(size, GFP_KERNEL); | |
840 | if (!buffer) | |
841 | goto out_refund; | |
842 | ||
843 | context->buffer = buffer; | |
844 | context->size = size; | |
845 | context->mm = get_task_mm(current); | |
846 | ||
847 | return 0; | |
848 | ||
849 | out_refund: | |
850 | refund_locked_memory(current->mm, size); | |
851 | return err; | |
e2b371f0 MM |
852 | } |
853 | ||
854 | static inline void free_bts_buffer(struct bts_context *context) | |
855 | { | |
856 | if (!context->buffer) | |
857 | return; | |
858 | ||
859 | kfree(context->buffer); | |
860 | context->buffer = NULL; | |
861 | ||
1cb81b14 | 862 | refund_locked_memory(context->mm, context->size); |
e2b371f0 MM |
863 | context->size = 0; |
864 | ||
865 | mmput(context->mm); | |
866 | context->mm = NULL; | |
867 | } | |
868 | ||
869 | static void free_bts_context_work(struct work_struct *w) | |
870 | { | |
871 | struct bts_context *context; | |
872 | ||
873 | context = container_of(w, struct bts_context, work); | |
874 | ||
875 | ds_release_bts(context->tracer); | |
876 | put_task_struct(context->task); | |
877 | free_bts_buffer(context); | |
878 | kfree(context); | |
879 | } | |
880 | ||
881 | static inline void free_bts_context(struct bts_context *context) | |
882 | { | |
883 | INIT_WORK(&context->work, free_bts_context_work); | |
884 | schedule_work(&context->work); | |
885 | } | |
886 | ||
887 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) | |
888 | { | |
889 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); | |
890 | if (context) { | |
891 | context->task = task; | |
892 | task->bts = context; | |
893 | ||
894 | get_task_struct(task); | |
895 | } | |
896 | ||
897 | return context; | |
898 | } | |
899 | ||
93fa7636 | 900 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
901 | struct bts_struct __user *out) |
902 | { | |
e2b371f0 | 903 | struct bts_context *context; |
c2724775 MM |
904 | const struct bts_trace *trace; |
905 | struct bts_struct bts; | |
906 | const unsigned char *at; | |
93fa7636 | 907 | int error; |
eee3af4a | 908 | |
e2b371f0 MM |
909 | context = child->bts; |
910 | if (!context) | |
911 | return -ESRCH; | |
912 | ||
913 | trace = ds_read_bts(context->tracer); | |
c2724775 | 914 | if (!trace) |
e2b371f0 | 915 | return -ESRCH; |
e4811f25 | 916 | |
c2724775 MM |
917 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
918 | if ((void *)at < trace->ds.begin) | |
919 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 920 | |
c2724775 MM |
921 | if (!trace->read) |
922 | return -EOPNOTSUPP; | |
93fa7636 | 923 | |
e2b371f0 | 924 | error = trace->read(context->tracer, at, &bts); |
93fa7636 MM |
925 | if (error < 0) |
926 | return error; | |
e4811f25 | 927 | |
c2724775 | 928 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
929 | return -EFAULT; |
930 | ||
c2724775 | 931 | return sizeof(bts); |
eee3af4a MM |
932 | } |
933 | ||
a95d67f8 | 934 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 935 | long size, |
a95d67f8 MM |
936 | struct bts_struct __user *out) |
937 | { | |
e2b371f0 | 938 | struct bts_context *context; |
c2724775 MM |
939 | const struct bts_trace *trace; |
940 | const unsigned char *at; | |
941 | int error, drained = 0; | |
eee3af4a | 942 | |
e2b371f0 MM |
943 | context = child->bts; |
944 | if (!context) | |
945 | return -ESRCH; | |
946 | ||
947 | trace = ds_read_bts(context->tracer); | |
c2724775 | 948 | if (!trace) |
e2b371f0 | 949 | return -ESRCH; |
a95d67f8 | 950 | |
c2724775 MM |
951 | if (!trace->read) |
952 | return -EOPNOTSUPP; | |
953 | ||
954 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
955 | return -EIO; |
956 | ||
c2724775 MM |
957 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
958 | out++, drained++, at += trace->ds.size) { | |
959 | struct bts_struct bts; | |
a95d67f8 | 960 | |
e2b371f0 | 961 | error = trace->read(context->tracer, at, &bts); |
c2724775 MM |
962 | if (error < 0) |
963 | return error; | |
a95d67f8 | 964 | |
c2724775 | 965 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
966 | return -EFAULT; |
967 | } | |
968 | ||
c2724775 MM |
969 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
970 | ||
e2b371f0 | 971 | error = ds_reset_bts(context->tracer); |
93fa7636 MM |
972 | if (error < 0) |
973 | return error; | |
a95d67f8 | 974 | |
c2724775 | 975 | return drained; |
a95d67f8 MM |
976 | } |
977 | ||
978 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 979 | long cfg_size, |
a95d67f8 MM |
980 | const struct ptrace_bts_config __user *ucfg) |
981 | { | |
e2b371f0 | 982 | struct bts_context *context; |
a95d67f8 | 983 | struct ptrace_bts_config cfg; |
c2724775 | 984 | unsigned int flags = 0; |
a95d67f8 | 985 | |
cba4b65d | 986 | if (cfg_size < sizeof(cfg)) |
c2724775 | 987 | return -EIO; |
cba4b65d | 988 | |
a95d67f8 | 989 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 990 | return -EFAULT; |
6abb11ae | 991 | |
e2b371f0 MM |
992 | context = child->bts; |
993 | if (!context) | |
994 | context = alloc_bts_context(child); | |
995 | if (!context) | |
996 | return -ENOMEM; | |
93fa7636 | 997 | |
c2724775 MM |
998 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
999 | if (!cfg.signal) | |
1000 | return -EINVAL; | |
ca0002a1 | 1001 | |
5a8ac9d2 | 1002 | return -EOPNOTSUPP; |
e2b371f0 | 1003 | context->bts_ovfl_signal = cfg.signal; |
c2724775 | 1004 | } |
6abb11ae | 1005 | |
e2b371f0 MM |
1006 | ds_release_bts(context->tracer); |
1007 | context->tracer = NULL; | |
6abb11ae | 1008 | |
e2b371f0 | 1009 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
1cb81b14 MM |
1010 | int err; |
1011 | ||
e2b371f0 MM |
1012 | free_bts_buffer(context); |
1013 | if (!cfg.size) | |
1014 | return 0; | |
c5dee617 | 1015 | |
1cb81b14 MM |
1016 | err = alloc_bts_buffer(context, cfg.size); |
1017 | if (err < 0) | |
1018 | return err; | |
a95d67f8 MM |
1019 | } |
1020 | ||
da35c371 | 1021 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 1022 | flags |= BTS_USER; |
eee3af4a | 1023 | |
da35c371 | 1024 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 1025 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 1026 | |
de79f54f MM |
1027 | context->tracer = |
1028 | ds_request_bts_task(child, context->buffer, context->size, | |
1029 | NULL, (size_t)-1, flags); | |
e2b371f0 MM |
1030 | if (unlikely(IS_ERR(context->tracer))) { |
1031 | int error = PTR_ERR(context->tracer); | |
da35c371 | 1032 | |
e2b371f0 MM |
1033 | free_bts_buffer(context); |
1034 | context->tracer = NULL; | |
c2724775 MM |
1035 | return error; |
1036 | } | |
da35c371 | 1037 | |
c2724775 | 1038 | return sizeof(cfg); |
eee3af4a MM |
1039 | } |
1040 | ||
a95d67f8 | 1041 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 1042 | long cfg_size, |
a95d67f8 | 1043 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 1044 | { |
e2b371f0 | 1045 | struct bts_context *context; |
c2724775 | 1046 | const struct bts_trace *trace; |
a95d67f8 | 1047 | struct ptrace_bts_config cfg; |
eee3af4a | 1048 | |
e2b371f0 MM |
1049 | context = child->bts; |
1050 | if (!context) | |
1051 | return -ESRCH; | |
1052 | ||
cba4b65d MM |
1053 | if (cfg_size < sizeof(cfg)) |
1054 | return -EIO; | |
1055 | ||
e2b371f0 | 1056 | trace = ds_read_bts(context->tracer); |
c2724775 | 1057 | if (!trace) |
e2b371f0 | 1058 | return -ESRCH; |
eee3af4a | 1059 | |
93fa7636 | 1060 | memset(&cfg, 0, sizeof(cfg)); |
e2b371f0 MM |
1061 | cfg.size = trace->ds.end - trace->ds.begin; |
1062 | cfg.signal = context->bts_ovfl_signal; | |
1063 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 1064 | |
93fa7636 MM |
1065 | if (cfg.signal) |
1066 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 1067 | |
c2724775 | 1068 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
1069 | cfg.flags |= PTRACE_BTS_O_TRACE; |
1070 | ||
c2724775 | 1071 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 1072 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 1073 | |
a95d67f8 MM |
1074 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
1075 | return -EFAULT; | |
eee3af4a | 1076 | |
a95d67f8 | 1077 | return sizeof(cfg); |
eee3af4a MM |
1078 | } |
1079 | ||
c2724775 | 1080 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 1081 | { |
e2b371f0 | 1082 | struct bts_context *context; |
c2724775 | 1083 | const struct bts_trace *trace; |
d8d4f157 | 1084 | |
e2b371f0 MM |
1085 | context = child->bts; |
1086 | if (!context) | |
1087 | return -ESRCH; | |
1088 | ||
1089 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1090 | if (!trace) |
e2b371f0 | 1091 | return -ESRCH; |
d8d4f157 | 1092 | |
c2724775 | 1093 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 1094 | |
e2b371f0 | 1095 | return ds_reset_bts(context->tracer); |
d8d4f157 AM |
1096 | } |
1097 | ||
c2724775 | 1098 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 1099 | { |
e2b371f0 | 1100 | struct bts_context *context; |
c2724775 | 1101 | const struct bts_trace *trace; |
93fa7636 | 1102 | |
e2b371f0 MM |
1103 | context = child->bts; |
1104 | if (!context) | |
1105 | return -ESRCH; | |
1106 | ||
1107 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1108 | if (!trace) |
e2b371f0 | 1109 | return -ESRCH; |
93fa7636 | 1110 | |
c2724775 | 1111 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 1112 | } |
bf53de90 | 1113 | |
e2b371f0 MM |
1114 | /* |
1115 | * Called from __ptrace_unlink() after the child has been moved back | |
1116 | * to its original parent. | |
1117 | */ | |
0f481406 | 1118 | void ptrace_bts_untrace(struct task_struct *child) |
bf53de90 MM |
1119 | { |
1120 | if (unlikely(child->bts)) { | |
e2b371f0 | 1121 | free_bts_context(child->bts); |
bf53de90 | 1122 | child->bts = NULL; |
bf53de90 MM |
1123 | } |
1124 | } | |
93fa7636 | 1125 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1126 | |
1da177e4 LT |
1127 | /* |
1128 | * Called by kernel/ptrace.c when detaching.. | |
1129 | * | |
1130 | * Make sure the single step bit is not set. | |
1131 | */ | |
1132 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 1133 | { |
7f232343 | 1134 | user_disable_single_step(child); |
e9c86c78 | 1135 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 1136 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 1137 | #endif |
1da177e4 LT |
1138 | } |
1139 | ||
5a4646a4 RM |
1140 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1141 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
1142 | #endif | |
1143 | ||
481bed45 | 1144 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 1145 | { |
5a4646a4 | 1146 | int ret; |
1da177e4 LT |
1147 | unsigned long __user *datap = (unsigned long __user *)data; |
1148 | ||
1da177e4 | 1149 | switch (request) { |
1da177e4 LT |
1150 | /* read the word at location addr in the USER area. */ |
1151 | case PTRACE_PEEKUSR: { | |
1152 | unsigned long tmp; | |
1153 | ||
1154 | ret = -EIO; | |
e9c86c78 RM |
1155 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1156 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1157 | break; |
1158 | ||
1159 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 1160 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1161 | tmp = getreg(child, addr); |
e9c86c78 RM |
1162 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1163 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1164 | addr -= offsetof(struct user, u_debugreg[0]); | |
1165 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
1166 | } |
1167 | ret = put_user(tmp, datap); | |
1168 | break; | |
1169 | } | |
1170 | ||
1da177e4 LT |
1171 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
1172 | ret = -EIO; | |
e9c86c78 RM |
1173 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1174 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1175 | break; |
1176 | ||
e9c86c78 | 1177 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1178 | ret = putreg(child, addr, data); |
e9c86c78 RM |
1179 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1180 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1181 | addr -= offsetof(struct user, u_debugreg[0]); | |
1182 | ret = ptrace_set_debugreg(child, | |
1183 | addr / sizeof(data), data); | |
1da177e4 | 1184 | } |
e9c86c78 | 1185 | break; |
1da177e4 | 1186 | |
5a4646a4 RM |
1187 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1188 | return copy_regset_to_user(child, | |
1189 | task_user_regset_view(current), | |
1190 | REGSET_GENERAL, | |
1191 | 0, sizeof(struct user_regs_struct), | |
1192 | datap); | |
1193 | ||
1194 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1195 | return copy_regset_from_user(child, | |
1196 | task_user_regset_view(current), | |
1197 | REGSET_GENERAL, | |
1198 | 0, sizeof(struct user_regs_struct), | |
1199 | datap); | |
1200 | ||
1201 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1202 | return copy_regset_to_user(child, | |
1203 | task_user_regset_view(current), | |
1204 | REGSET_FP, | |
1205 | 0, sizeof(struct user_i387_struct), | |
1206 | datap); | |
1207 | ||
1208 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1209 | return copy_regset_from_user(child, | |
1210 | task_user_regset_view(current), | |
1211 | REGSET_FP, | |
1212 | 0, sizeof(struct user_i387_struct), | |
1213 | datap); | |
1da177e4 | 1214 | |
e9c86c78 | 1215 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
1216 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
1217 | return copy_regset_to_user(child, &user_x86_32_view, | |
1218 | REGSET_XFP, | |
1219 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1220 | datap) ? -EIO : 0; |
5a4646a4 RM |
1221 | |
1222 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1223 | return copy_regset_from_user(child, &user_x86_32_view, | |
1224 | REGSET_XFP, | |
1225 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1226 | datap) ? -EIO : 0; |
e9c86c78 | 1227 | #endif |
1da177e4 | 1228 | |
e9c86c78 | 1229 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 1230 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
1231 | if (addr < 0) |
1232 | return -EIO; | |
1233 | ret = do_get_thread_area(child, addr, | |
1234 | (struct user_desc __user *) data); | |
1da177e4 LT |
1235 | break; |
1236 | ||
1237 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
1238 | if (addr < 0) |
1239 | return -EIO; | |
1240 | ret = do_set_thread_area(child, addr, | |
1241 | (struct user_desc __user *) data, 0); | |
1da177e4 | 1242 | break; |
e9c86c78 RM |
1243 | #endif |
1244 | ||
1245 | #ifdef CONFIG_X86_64 | |
1246 | /* normal 64bit interface to access TLS data. | |
1247 | Works just like arch_prctl, except that the arguments | |
1248 | are reversed. */ | |
1249 | case PTRACE_ARCH_PRCTL: | |
1250 | ret = do_arch_prctl(child, data, addr); | |
1251 | break; | |
1252 | #endif | |
1da177e4 | 1253 | |
b4ef95de IM |
1254 | /* |
1255 | * These bits need more cooking - not enabled yet: | |
1256 | */ | |
93fa7636 | 1257 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
1258 | case PTRACE_BTS_CONFIG: |
1259 | ret = ptrace_bts_config | |
cba4b65d | 1260 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1261 | break; |
1262 | ||
a95d67f8 MM |
1263 | case PTRACE_BTS_STATUS: |
1264 | ret = ptrace_bts_status | |
cba4b65d | 1265 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1266 | break; |
1267 | ||
c2724775 MM |
1268 | case PTRACE_BTS_SIZE: |
1269 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
1270 | break; |
1271 | ||
a95d67f8 | 1272 | case PTRACE_BTS_GET: |
eee3af4a | 1273 | ret = ptrace_bts_read_record |
a95d67f8 | 1274 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1275 | break; |
1276 | ||
a95d67f8 | 1277 | case PTRACE_BTS_CLEAR: |
c2724775 | 1278 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
1279 | break; |
1280 | ||
a95d67f8 MM |
1281 | case PTRACE_BTS_DRAIN: |
1282 | ret = ptrace_bts_drain | |
cba4b65d | 1283 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1284 | break; |
93fa7636 | 1285 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1286 | |
1da177e4 LT |
1287 | default: |
1288 | ret = ptrace_request(child, request, addr, data); | |
1289 | break; | |
1290 | } | |
d9771e8c | 1291 | |
1da177e4 LT |
1292 | return ret; |
1293 | } | |
1294 | ||
cb757c41 RM |
1295 | #ifdef CONFIG_IA32_EMULATION |
1296 | ||
099cd6e9 RM |
1297 | #include <linux/compat.h> |
1298 | #include <linux/syscalls.h> | |
1299 | #include <asm/ia32.h> | |
cb757c41 RM |
1300 | #include <asm/user32.h> |
1301 | ||
1302 | #define R32(l,q) \ | |
1303 | case offsetof(struct user32, regs.l): \ | |
1304 | regs->q = value; break | |
1305 | ||
1306 | #define SEG32(rs) \ | |
1307 | case offsetof(struct user32, regs.rs): \ | |
1308 | return set_segment_reg(child, \ | |
1309 | offsetof(struct user_regs_struct, rs), \ | |
1310 | value); \ | |
1311 | break | |
1312 | ||
1313 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1314 | { | |
1315 | struct pt_regs *regs = task_pt_regs(child); | |
1316 | ||
1317 | switch (regno) { | |
1318 | ||
1319 | SEG32(cs); | |
1320 | SEG32(ds); | |
1321 | SEG32(es); | |
1322 | SEG32(fs); | |
1323 | SEG32(gs); | |
1324 | SEG32(ss); | |
1325 | ||
1326 | R32(ebx, bx); | |
1327 | R32(ecx, cx); | |
1328 | R32(edx, dx); | |
1329 | R32(edi, di); | |
1330 | R32(esi, si); | |
1331 | R32(ebp, bp); | |
1332 | R32(eax, ax); | |
cb757c41 RM |
1333 | R32(eip, ip); |
1334 | R32(esp, sp); | |
1335 | ||
40f0933d RM |
1336 | case offsetof(struct user32, regs.orig_eax): |
1337 | /* | |
8cb3ed13 RM |
1338 | * A 32-bit debugger setting orig_eax means to restore |
1339 | * the state of the task restarting a 32-bit syscall. | |
1340 | * Make sure we interpret the -ERESTART* codes correctly | |
1341 | * in case the task is not actually still sitting at the | |
1342 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 1343 | */ |
8cb3ed13 RM |
1344 | regs->orig_ax = value; |
1345 | if (syscall_get_nr(child, regs) >= 0) | |
1346 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
1347 | break; |
1348 | ||
cb757c41 RM |
1349 | case offsetof(struct user32, regs.eflags): |
1350 | return set_flags(child, value); | |
1351 | ||
1352 | case offsetof(struct user32, u_debugreg[0]) ... | |
1353 | offsetof(struct user32, u_debugreg[7]): | |
1354 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1355 | return ptrace_set_debugreg(child, regno / 4, value); | |
1356 | ||
1357 | default: | |
1358 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1359 | return -EIO; | |
1360 | ||
1361 | /* | |
1362 | * Other dummy fields in the virtual user structure | |
1363 | * are ignored | |
1364 | */ | |
1365 | break; | |
1366 | } | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | #undef R32 | |
1371 | #undef SEG32 | |
1372 | ||
1373 | #define R32(l,q) \ | |
1374 | case offsetof(struct user32, regs.l): \ | |
1375 | *val = regs->q; break | |
1376 | ||
1377 | #define SEG32(rs) \ | |
1378 | case offsetof(struct user32, regs.rs): \ | |
1379 | *val = get_segment_reg(child, \ | |
1380 | offsetof(struct user_regs_struct, rs)); \ | |
1381 | break | |
1382 | ||
1383 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1384 | { | |
1385 | struct pt_regs *regs = task_pt_regs(child); | |
1386 | ||
1387 | switch (regno) { | |
1388 | ||
1389 | SEG32(ds); | |
1390 | SEG32(es); | |
1391 | SEG32(fs); | |
1392 | SEG32(gs); | |
1393 | ||
1394 | R32(cs, cs); | |
1395 | R32(ss, ss); | |
1396 | R32(ebx, bx); | |
1397 | R32(ecx, cx); | |
1398 | R32(edx, dx); | |
1399 | R32(edi, di); | |
1400 | R32(esi, si); | |
1401 | R32(ebp, bp); | |
1402 | R32(eax, ax); | |
1403 | R32(orig_eax, orig_ax); | |
1404 | R32(eip, ip); | |
1405 | R32(esp, sp); | |
1406 | ||
1407 | case offsetof(struct user32, regs.eflags): | |
1408 | *val = get_flags(child); | |
1409 | break; | |
1410 | ||
1411 | case offsetof(struct user32, u_debugreg[0]) ... | |
1412 | offsetof(struct user32, u_debugreg[7]): | |
1413 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1414 | *val = ptrace_get_debugreg(child, regno / 4); | |
1415 | break; | |
1416 | ||
1417 | default: | |
1418 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1419 | return -EIO; | |
1420 | ||
1421 | /* | |
1422 | * Other dummy fields in the virtual user structure | |
1423 | * are ignored | |
1424 | */ | |
1425 | *val = 0; | |
1426 | break; | |
1427 | } | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | #undef R32 | |
1432 | #undef SEG32 | |
1433 | ||
91e7b707 RM |
1434 | static int genregs32_get(struct task_struct *target, |
1435 | const struct user_regset *regset, | |
1436 | unsigned int pos, unsigned int count, | |
1437 | void *kbuf, void __user *ubuf) | |
1438 | { | |
1439 | if (kbuf) { | |
1440 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1441 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1442 | getreg32(target, pos, k++); |
1443 | count -= sizeof(*k); | |
1444 | pos += sizeof(*k); | |
1445 | } | |
1446 | } else { | |
1447 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1448 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1449 | compat_ulong_t word; |
1450 | getreg32(target, pos, &word); | |
1451 | if (__put_user(word, u++)) | |
1452 | return -EFAULT; | |
1453 | count -= sizeof(*u); | |
1454 | pos += sizeof(*u); | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static int genregs32_set(struct task_struct *target, | |
1462 | const struct user_regset *regset, | |
1463 | unsigned int pos, unsigned int count, | |
1464 | const void *kbuf, const void __user *ubuf) | |
1465 | { | |
1466 | int ret = 0; | |
1467 | if (kbuf) { | |
1468 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1469 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1470 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1471 | count -= sizeof(*k); |
1472 | pos += sizeof(*k); | |
1473 | } | |
1474 | } else { | |
1475 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1476 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1477 | compat_ulong_t word; |
1478 | ret = __get_user(word, u++); | |
1479 | if (ret) | |
1480 | break; | |
f9cb02b0 | 1481 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1482 | count -= sizeof(*u); |
1483 | pos += sizeof(*u); | |
1484 | } | |
1485 | } | |
1486 | return ret; | |
1487 | } | |
1488 | ||
562b80ba RM |
1489 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1490 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1491 | { |
562b80ba RM |
1492 | unsigned long addr = caddr; |
1493 | unsigned long data = cdata; | |
099cd6e9 RM |
1494 | void __user *datap = compat_ptr(data); |
1495 | int ret; | |
1496 | __u32 val; | |
1497 | ||
099cd6e9 | 1498 | switch (request) { |
099cd6e9 RM |
1499 | case PTRACE_PEEKUSR: |
1500 | ret = getreg32(child, addr, &val); | |
1501 | if (ret == 0) | |
1502 | ret = put_user(val, (__u32 __user *)datap); | |
1503 | break; | |
1504 | ||
1505 | case PTRACE_POKEUSR: | |
1506 | ret = putreg32(child, addr, data); | |
1507 | break; | |
1508 | ||
5a4646a4 RM |
1509 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1510 | return copy_regset_to_user(child, &user_x86_32_view, | |
1511 | REGSET_GENERAL, | |
1512 | 0, sizeof(struct user_regs_struct32), | |
1513 | datap); | |
1514 | ||
1515 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1516 | return copy_regset_from_user(child, &user_x86_32_view, | |
1517 | REGSET_GENERAL, 0, | |
1518 | sizeof(struct user_regs_struct32), | |
1519 | datap); | |
1520 | ||
1521 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1522 | return copy_regset_to_user(child, &user_x86_32_view, | |
1523 | REGSET_FP, 0, | |
1524 | sizeof(struct user_i387_ia32_struct), | |
1525 | datap); | |
1526 | ||
1527 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1528 | return copy_regset_from_user( | |
1529 | child, &user_x86_32_view, REGSET_FP, | |
1530 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1531 | ||
1532 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1533 | return copy_regset_to_user(child, &user_x86_32_view, | |
1534 | REGSET_XFP, 0, | |
1535 | sizeof(struct user32_fxsr_struct), | |
1536 | datap); | |
1537 | ||
1538 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1539 | return copy_regset_from_user(child, &user_x86_32_view, | |
1540 | REGSET_XFP, 0, | |
1541 | sizeof(struct user32_fxsr_struct), | |
1542 | datap); | |
099cd6e9 | 1543 | |
562b80ba RM |
1544 | case PTRACE_GET_THREAD_AREA: |
1545 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1546 | #ifdef CONFIG_X86_PTRACE_BTS |
1547 | case PTRACE_BTS_CONFIG: | |
1548 | case PTRACE_BTS_STATUS: | |
1549 | case PTRACE_BTS_SIZE: | |
1550 | case PTRACE_BTS_GET: | |
1551 | case PTRACE_BTS_CLEAR: | |
1552 | case PTRACE_BTS_DRAIN: | |
1553 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1554 | return arch_ptrace(child, request, addr, data); |
1555 | ||
099cd6e9 | 1556 | default: |
fdadd54d | 1557 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1558 | } |
1559 | ||
099cd6e9 RM |
1560 | return ret; |
1561 | } | |
1562 | ||
cb757c41 RM |
1563 | #endif /* CONFIG_IA32_EMULATION */ |
1564 | ||
070459d9 RM |
1565 | #ifdef CONFIG_X86_64 |
1566 | ||
5b3efd50 | 1567 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1568 | [REGSET_GENERAL] = { |
1569 | .core_note_type = NT_PRSTATUS, | |
1570 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1571 | .size = sizeof(long), .align = sizeof(long), | |
1572 | .get = genregs_get, .set = genregs_set | |
1573 | }, | |
1574 | [REGSET_FP] = { | |
1575 | .core_note_type = NT_PRFPREG, | |
1576 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1577 | .size = sizeof(long), .align = sizeof(long), | |
1578 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1579 | }, | |
5b3efd50 SS |
1580 | [REGSET_XSTATE] = { |
1581 | .core_note_type = NT_X86_XSTATE, | |
1582 | .size = sizeof(u64), .align = sizeof(u64), | |
1583 | .active = xstateregs_active, .get = xstateregs_get, | |
1584 | .set = xstateregs_set | |
1585 | }, | |
325af5fb RM |
1586 | [REGSET_IOPERM64] = { |
1587 | .core_note_type = NT_386_IOPERM, | |
1588 | .n = IO_BITMAP_LONGS, | |
1589 | .size = sizeof(long), .align = sizeof(long), | |
1590 | .active = ioperm_active, .get = ioperm_get | |
1591 | }, | |
070459d9 RM |
1592 | }; |
1593 | ||
1594 | static const struct user_regset_view user_x86_64_view = { | |
1595 | .name = "x86_64", .e_machine = EM_X86_64, | |
1596 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1597 | }; | |
1598 | ||
1599 | #else /* CONFIG_X86_32 */ | |
1600 | ||
1601 | #define user_regs_struct32 user_regs_struct | |
1602 | #define genregs32_get genregs_get | |
1603 | #define genregs32_set genregs_set | |
1604 | ||
1f465f4e RM |
1605 | #define user_i387_ia32_struct user_i387_struct |
1606 | #define user32_fxsr_struct user_fxsr_struct | |
1607 | ||
070459d9 RM |
1608 | #endif /* CONFIG_X86_64 */ |
1609 | ||
1610 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1611 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1612 | [REGSET_GENERAL] = { |
1613 | .core_note_type = NT_PRSTATUS, | |
1614 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1615 | .size = sizeof(u32), .align = sizeof(u32), | |
1616 | .get = genregs32_get, .set = genregs32_set | |
1617 | }, | |
1618 | [REGSET_FP] = { | |
1619 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1620 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1621 | .size = sizeof(u32), .align = sizeof(u32), |
1622 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1623 | }, | |
1624 | [REGSET_XFP] = { | |
1625 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1626 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1627 | .size = sizeof(u32), .align = sizeof(u32), |
1628 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1629 | }, | |
5b3efd50 SS |
1630 | [REGSET_XSTATE] = { |
1631 | .core_note_type = NT_X86_XSTATE, | |
1632 | .size = sizeof(u64), .align = sizeof(u64), | |
1633 | .active = xstateregs_active, .get = xstateregs_get, | |
1634 | .set = xstateregs_set | |
1635 | }, | |
070459d9 | 1636 | [REGSET_TLS] = { |
bb61682b | 1637 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1638 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1639 | .size = sizeof(struct user_desc), | |
1640 | .align = sizeof(struct user_desc), | |
1641 | .active = regset_tls_active, | |
1642 | .get = regset_tls_get, .set = regset_tls_set | |
1643 | }, | |
325af5fb RM |
1644 | [REGSET_IOPERM32] = { |
1645 | .core_note_type = NT_386_IOPERM, | |
1646 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1647 | .size = sizeof(u32), .align = sizeof(u32), | |
1648 | .active = ioperm_active, .get = ioperm_get | |
1649 | }, | |
070459d9 RM |
1650 | }; |
1651 | ||
1652 | static const struct user_regset_view user_x86_32_view = { | |
1653 | .name = "i386", .e_machine = EM_386, | |
1654 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1655 | }; | |
1656 | #endif | |
1657 | ||
5b3efd50 SS |
1658 | /* |
1659 | * This represents bytes 464..511 in the memory layout exported through | |
1660 | * the REGSET_XSTATE interface. | |
1661 | */ | |
1662 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1663 | ||
1664 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1665 | { | |
1666 | #ifdef CONFIG_X86_64 | |
1667 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1668 | #endif | |
1669 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1670 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1671 | #endif | |
1672 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1673 | } | |
1674 | ||
070459d9 RM |
1675 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1676 | { | |
1677 | #ifdef CONFIG_IA32_EMULATION | |
1678 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1679 | #endif | |
1680 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1681 | return &user_x86_32_view; | |
1682 | #endif | |
1683 | #ifdef CONFIG_X86_64 | |
1684 | return &user_x86_64_view; | |
1685 | #endif | |
1686 | } | |
1687 | ||
7f38551f ON |
1688 | static void fill_sigtrap_info(struct task_struct *tsk, |
1689 | struct pt_regs *regs, | |
1690 | int error_code, int si_code, | |
1691 | struct siginfo *info) | |
1da177e4 | 1692 | { |
1da177e4 LT |
1693 | tsk->thread.trap_no = 1; |
1694 | tsk->thread.error_code = error_code; | |
1695 | ||
7f38551f ON |
1696 | memset(info, 0, sizeof(*info)); |
1697 | info->si_signo = SIGTRAP; | |
1698 | info->si_code = si_code; | |
1699 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1700 | } | |
1701 | ||
1702 | void user_single_step_siginfo(struct task_struct *tsk, | |
1703 | struct pt_regs *regs, | |
1704 | struct siginfo *info) | |
1705 | { | |
1706 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1707 | } | |
1da177e4 | 1708 | |
7f38551f ON |
1709 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1710 | int error_code, int si_code) | |
1711 | { | |
1712 | struct siginfo info; | |
1da177e4 | 1713 | |
7f38551f | 1714 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1715 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1716 | force_sig_info(SIGTRAP, &info, tsk); |
1717 | } | |
1718 | ||
86976cd8 | 1719 | |
d4d67150 RM |
1720 | #ifdef CONFIG_X86_32 |
1721 | # define IS_IA32 1 | |
1722 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1723 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1724 | #else |
1725 | # define IS_IA32 0 | |
1726 | #endif | |
1727 | ||
1728 | /* | |
1729 | * We must return the syscall number to actually look up in the table. | |
1730 | * This can be -1L to skip running any syscall at all. | |
1731 | */ | |
1732 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1733 | { |
d4d67150 RM |
1734 | long ret = 0; |
1735 | ||
380fdd75 RM |
1736 | /* |
1737 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1738 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1739 | * If user-mode had set TF itself, then it's still clear from | |
1740 | * do_debug() and we need to set it again to restore the user | |
1741 | * state. If we entered on the slow path, TF was already set. | |
1742 | */ | |
1743 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1744 | regs->flags |= X86_EFLAGS_TF; | |
1745 | ||
86976cd8 RM |
1746 | /* do the secure computing check first */ |
1747 | secure_computing(regs->orig_ax); | |
1748 | ||
d4d67150 RM |
1749 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1750 | ret = -1L; | |
1751 | ||
eeea3c3f RM |
1752 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1753 | tracehook_report_syscall_entry(regs)) | |
1754 | ret = -1L; | |
86976cd8 | 1755 | |
66700001 | 1756 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1757 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1758 | |
86976cd8 | 1759 | if (unlikely(current->audit_context)) { |
d4d67150 | 1760 | if (IS_IA32) |
86976cd8 RM |
1761 | audit_syscall_entry(AUDIT_ARCH_I386, |
1762 | regs->orig_ax, | |
1763 | regs->bx, regs->cx, | |
1764 | regs->dx, regs->si); | |
d4d67150 RM |
1765 | #ifdef CONFIG_X86_64 |
1766 | else | |
86976cd8 RM |
1767 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1768 | regs->orig_ax, | |
1769 | regs->di, regs->si, | |
1770 | regs->dx, regs->r10); | |
d4d67150 | 1771 | #endif |
86976cd8 | 1772 | } |
d4d67150 RM |
1773 | |
1774 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1775 | } |
1776 | ||
d4d67150 | 1777 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1778 | { |
d5196503 ON |
1779 | bool step; |
1780 | ||
86976cd8 RM |
1781 | if (unlikely(current->audit_context)) |
1782 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1783 | ||
66700001 | 1784 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1785 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1786 | |
d4d67150 RM |
1787 | /* |
1788 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1789 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1790 | * We already reported this syscall instruction in | |
d5196503 | 1791 | * syscall_trace_enter(). |
d4d67150 | 1792 | */ |
d5196503 ON |
1793 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1794 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1795 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1796 | tracehook_report_syscall_exit(regs, step); | |
d4d67150 | 1797 | } |