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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 | 14 | #include <linux/errno.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 | 16 | #include <linux/ptrace.h> |
91e7b707 | 17 | #include <linux/regset.h> |
eeea3c3f | 18 | #include <linux/tracehook.h> |
1da177e4 | 19 | #include <linux/user.h> |
070459d9 | 20 | #include <linux/elf.h> |
1da177e4 LT |
21 | #include <linux/security.h> |
22 | #include <linux/audit.h> | |
23 | #include <linux/seccomp.h> | |
7ed20e1a | 24 | #include <linux/signal.h> |
e2b371f0 | 25 | #include <linux/workqueue.h> |
24f1e32c FW |
26 | #include <linux/perf_event.h> |
27 | #include <linux/hw_breakpoint.h> | |
1da177e4 LT |
28 | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/i387.h> | |
34 | #include <asm/debugreg.h> | |
35 | #include <asm/ldt.h> | |
36 | #include <asm/desc.h> | |
2047b08b RM |
37 | #include <asm/prctl.h> |
38 | #include <asm/proto.h> | |
eee3af4a | 39 | #include <asm/ds.h> |
72f674d2 | 40 | #include <asm/hw_breakpoint.h> |
eee3af4a | 41 | |
070459d9 RM |
42 | #include "tls.h" |
43 | ||
1c569f02 JS |
44 | #define CREATE_TRACE_POINTS |
45 | #include <trace/events/syscalls.h> | |
46 | ||
070459d9 RM |
47 | enum x86_regset { |
48 | REGSET_GENERAL, | |
49 | REGSET_FP, | |
50 | REGSET_XFP, | |
325af5fb | 51 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 52 | REGSET_XSTATE, |
070459d9 | 53 | REGSET_TLS, |
325af5fb | 54 | REGSET_IOPERM32, |
070459d9 | 55 | }; |
eee3af4a | 56 | |
b1cf540f MH |
57 | struct pt_regs_offset { |
58 | const char *name; | |
59 | int offset; | |
60 | }; | |
61 | ||
62 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
63 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
64 | ||
65 | static const struct pt_regs_offset regoffset_table[] = { | |
66 | #ifdef CONFIG_X86_64 | |
67 | REG_OFFSET_NAME(r15), | |
68 | REG_OFFSET_NAME(r14), | |
69 | REG_OFFSET_NAME(r13), | |
70 | REG_OFFSET_NAME(r12), | |
71 | REG_OFFSET_NAME(r11), | |
72 | REG_OFFSET_NAME(r10), | |
73 | REG_OFFSET_NAME(r9), | |
74 | REG_OFFSET_NAME(r8), | |
75 | #endif | |
76 | REG_OFFSET_NAME(bx), | |
77 | REG_OFFSET_NAME(cx), | |
78 | REG_OFFSET_NAME(dx), | |
79 | REG_OFFSET_NAME(si), | |
80 | REG_OFFSET_NAME(di), | |
81 | REG_OFFSET_NAME(bp), | |
82 | REG_OFFSET_NAME(ax), | |
83 | #ifdef CONFIG_X86_32 | |
84 | REG_OFFSET_NAME(ds), | |
85 | REG_OFFSET_NAME(es), | |
86 | REG_OFFSET_NAME(fs), | |
87 | REG_OFFSET_NAME(gs), | |
88 | #endif | |
89 | REG_OFFSET_NAME(orig_ax), | |
90 | REG_OFFSET_NAME(ip), | |
91 | REG_OFFSET_NAME(cs), | |
92 | REG_OFFSET_NAME(flags), | |
93 | REG_OFFSET_NAME(sp), | |
94 | REG_OFFSET_NAME(ss), | |
95 | REG_OFFSET_END, | |
96 | }; | |
97 | ||
98 | /** | |
99 | * regs_query_register_offset() - query register offset from its name | |
100 | * @name: the name of a register | |
101 | * | |
102 | * regs_query_register_offset() returns the offset of a register in struct | |
103 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
104 | */ | |
105 | int regs_query_register_offset(const char *name) | |
106 | { | |
107 | const struct pt_regs_offset *roff; | |
108 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
109 | if (!strcmp(roff->name, name)) | |
110 | return roff->offset; | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | /** | |
115 | * regs_query_register_name() - query register name from its offset | |
116 | * @offset: the offset of a register in struct pt_regs. | |
117 | * | |
118 | * regs_query_register_name() returns the name of a register from its | |
119 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
120 | */ | |
121 | const char *regs_query_register_name(unsigned int offset) | |
122 | { | |
123 | const struct pt_regs_offset *roff; | |
124 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
125 | if (roff->offset == offset) | |
126 | return roff->name; | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static const int arg_offs_table[] = { | |
131 | #ifdef CONFIG_X86_32 | |
132 | [0] = offsetof(struct pt_regs, ax), | |
133 | [1] = offsetof(struct pt_regs, dx), | |
134 | [2] = offsetof(struct pt_regs, cx) | |
135 | #else /* CONFIG_X86_64 */ | |
136 | [0] = offsetof(struct pt_regs, di), | |
137 | [1] = offsetof(struct pt_regs, si), | |
138 | [2] = offsetof(struct pt_regs, dx), | |
139 | [3] = offsetof(struct pt_regs, cx), | |
140 | [4] = offsetof(struct pt_regs, r8), | |
141 | [5] = offsetof(struct pt_regs, r9) | |
142 | #endif | |
143 | }; | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * does not yet catch signals sent when the child dies. | |
147 | * in exit.c or in signal.c. | |
148 | */ | |
149 | ||
9f155b98 CE |
150 | /* |
151 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 152 | */ |
e39c2891 RM |
153 | #define FLAG_MASK_32 ((unsigned long) \ |
154 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
155 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
156 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
157 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
158 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
159 | ||
2047b08b RM |
160 | /* |
161 | * Determines whether a value may be installed in a segment register. | |
162 | */ | |
163 | static inline bool invalid_selector(u16 value) | |
164 | { | |
165 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_X86_32 | |
169 | ||
e39c2891 | 170 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 171 | |
4fe702c7 | 172 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 173 | { |
65ea5b03 | 174 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 175 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
176 | } |
177 | ||
06ee1b68 | 178 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 179 | { |
06ee1b68 RM |
180 | /* |
181 | * Returning the value truncates it to 16 bits. | |
182 | */ | |
183 | unsigned int retval; | |
184 | if (offset != offsetof(struct user_regs_struct, gs)) | |
185 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
186 | else { | |
06ee1b68 | 187 | if (task == current) |
d9a89a26 TH |
188 | retval = get_user_gs(task_pt_regs(task)); |
189 | else | |
190 | retval = task_user_gs(task); | |
06ee1b68 RM |
191 | } |
192 | return retval; | |
193 | } | |
194 | ||
195 | static int set_segment_reg(struct task_struct *task, | |
196 | unsigned long offset, u16 value) | |
197 | { | |
198 | /* | |
199 | * The value argument was already truncated to 16 bits. | |
200 | */ | |
2047b08b | 201 | if (invalid_selector(value)) |
06ee1b68 RM |
202 | return -EIO; |
203 | ||
c63855d0 RM |
204 | /* |
205 | * For %cs and %ss we cannot permit a null selector. | |
206 | * We can permit a bogus selector as long as it has USER_RPL. | |
207 | * Null selectors are fine for other segment registers, but | |
208 | * we will never get back to user mode with invalid %cs or %ss | |
209 | * and will take the trap in iret instead. Much code relies | |
210 | * on user_mode() to distinguish a user trap frame (which can | |
211 | * safely use invalid selectors) from a kernel trap frame. | |
212 | */ | |
213 | switch (offset) { | |
214 | case offsetof(struct user_regs_struct, cs): | |
215 | case offsetof(struct user_regs_struct, ss): | |
216 | if (unlikely(value == 0)) | |
217 | return -EIO; | |
218 | ||
219 | default: | |
06ee1b68 | 220 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
221 | break; |
222 | ||
223 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 224 | if (task == current) |
d9a89a26 TH |
225 | set_user_gs(task_pt_regs(task), value); |
226 | else | |
227 | task_user_gs(task) = value; | |
1da177e4 | 228 | } |
06ee1b68 | 229 | |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
2047b08b RM |
233 | #else /* CONFIG_X86_64 */ |
234 | ||
235 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
236 | ||
237 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
238 | { | |
239 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
240 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
241 | } | |
242 | ||
243 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
244 | { | |
245 | /* | |
246 | * Returning the value truncates it to 16 bits. | |
247 | */ | |
248 | unsigned int seg; | |
249 | ||
250 | switch (offset) { | |
251 | case offsetof(struct user_regs_struct, fs): | |
252 | if (task == current) { | |
253 | /* Older gas can't assemble movq %?s,%r?? */ | |
254 | asm("movl %%fs,%0" : "=r" (seg)); | |
255 | return seg; | |
256 | } | |
257 | return task->thread.fsindex; | |
258 | case offsetof(struct user_regs_struct, gs): | |
259 | if (task == current) { | |
260 | asm("movl %%gs,%0" : "=r" (seg)); | |
261 | return seg; | |
262 | } | |
263 | return task->thread.gsindex; | |
264 | case offsetof(struct user_regs_struct, ds): | |
265 | if (task == current) { | |
266 | asm("movl %%ds,%0" : "=r" (seg)); | |
267 | return seg; | |
268 | } | |
269 | return task->thread.ds; | |
270 | case offsetof(struct user_regs_struct, es): | |
271 | if (task == current) { | |
272 | asm("movl %%es,%0" : "=r" (seg)); | |
273 | return seg; | |
274 | } | |
275 | return task->thread.es; | |
276 | ||
277 | case offsetof(struct user_regs_struct, cs): | |
278 | case offsetof(struct user_regs_struct, ss): | |
279 | break; | |
280 | } | |
281 | return *pt_regs_access(task_pt_regs(task), offset); | |
282 | } | |
283 | ||
284 | static int set_segment_reg(struct task_struct *task, | |
285 | unsigned long offset, u16 value) | |
286 | { | |
287 | /* | |
288 | * The value argument was already truncated to 16 bits. | |
289 | */ | |
290 | if (invalid_selector(value)) | |
291 | return -EIO; | |
292 | ||
293 | switch (offset) { | |
294 | case offsetof(struct user_regs_struct,fs): | |
295 | /* | |
296 | * If this is setting fs as for normal 64-bit use but | |
297 | * setting fs_base has implicitly changed it, leave it. | |
298 | */ | |
299 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
300 | task->thread.fs != 0) || | |
301 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
302 | task->thread.fs == 0)) | |
303 | break; | |
304 | task->thread.fsindex = value; | |
305 | if (task == current) | |
306 | loadsegment(fs, task->thread.fsindex); | |
307 | break; | |
308 | case offsetof(struct user_regs_struct,gs): | |
309 | /* | |
310 | * If this is setting gs as for normal 64-bit use but | |
311 | * setting gs_base has implicitly changed it, leave it. | |
312 | */ | |
313 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
314 | task->thread.gs != 0) || | |
315 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
316 | task->thread.gs == 0)) | |
317 | break; | |
318 | task->thread.gsindex = value; | |
319 | if (task == current) | |
320 | load_gs_index(task->thread.gsindex); | |
321 | break; | |
322 | case offsetof(struct user_regs_struct,ds): | |
323 | task->thread.ds = value; | |
324 | if (task == current) | |
325 | loadsegment(ds, task->thread.ds); | |
326 | break; | |
327 | case offsetof(struct user_regs_struct,es): | |
328 | task->thread.es = value; | |
329 | if (task == current) | |
330 | loadsegment(es, task->thread.es); | |
331 | break; | |
332 | ||
333 | /* | |
334 | * Can't actually change these in 64-bit mode. | |
335 | */ | |
336 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
337 | if (unlikely(value == 0)) |
338 | return -EIO; | |
2047b08b RM |
339 | #ifdef CONFIG_IA32_EMULATION |
340 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
341 | task_pt_regs(task)->cs = value; | |
2047b08b | 342 | #endif |
cb757c41 | 343 | break; |
2047b08b | 344 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
345 | if (unlikely(value == 0)) |
346 | return -EIO; | |
2047b08b RM |
347 | #ifdef CONFIG_IA32_EMULATION |
348 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
349 | task_pt_regs(task)->ss = value; | |
2047b08b | 350 | #endif |
cb757c41 | 351 | break; |
2047b08b RM |
352 | } |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
2047b08b RM |
357 | #endif /* CONFIG_X86_32 */ |
358 | ||
06ee1b68 | 359 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 360 | { |
06ee1b68 RM |
361 | unsigned long retval = task_pt_regs(task)->flags; |
362 | ||
363 | /* | |
364 | * If the debugger set TF, hide it from the readout. | |
365 | */ | |
366 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
367 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 368 | |
1da177e4 LT |
369 | return retval; |
370 | } | |
371 | ||
06ee1b68 RM |
372 | static int set_flags(struct task_struct *task, unsigned long value) |
373 | { | |
374 | struct pt_regs *regs = task_pt_regs(task); | |
375 | ||
376 | /* | |
377 | * If the user value contains TF, mark that | |
378 | * it was not "us" (the debugger) that set it. | |
379 | * If not, make sure it stays set if we had. | |
380 | */ | |
381 | if (value & X86_EFLAGS_TF) | |
382 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
383 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
384 | value |= X86_EFLAGS_TF; | |
385 | ||
386 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | static int putreg(struct task_struct *child, | |
392 | unsigned long offset, unsigned long value) | |
393 | { | |
394 | switch (offset) { | |
395 | case offsetof(struct user_regs_struct, cs): | |
396 | case offsetof(struct user_regs_struct, ds): | |
397 | case offsetof(struct user_regs_struct, es): | |
398 | case offsetof(struct user_regs_struct, fs): | |
399 | case offsetof(struct user_regs_struct, gs): | |
400 | case offsetof(struct user_regs_struct, ss): | |
401 | return set_segment_reg(child, offset, value); | |
402 | ||
403 | case offsetof(struct user_regs_struct, flags): | |
404 | return set_flags(child, value); | |
2047b08b RM |
405 | |
406 | #ifdef CONFIG_X86_64 | |
407 | case offsetof(struct user_regs_struct,fs_base): | |
408 | if (value >= TASK_SIZE_OF(child)) | |
409 | return -EIO; | |
410 | /* | |
411 | * When changing the segment base, use do_arch_prctl | |
412 | * to set either thread.fs or thread.fsindex and the | |
413 | * corresponding GDT slot. | |
414 | */ | |
415 | if (child->thread.fs != value) | |
416 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
417 | return 0; | |
418 | case offsetof(struct user_regs_struct,gs_base): | |
419 | /* | |
420 | * Exactly the same here as the %fs handling above. | |
421 | */ | |
422 | if (value >= TASK_SIZE_OF(child)) | |
423 | return -EIO; | |
424 | if (child->thread.gs != value) | |
425 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
426 | return 0; | |
427 | #endif | |
06ee1b68 RM |
428 | } |
429 | ||
430 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
435 | { | |
436 | switch (offset) { | |
437 | case offsetof(struct user_regs_struct, cs): | |
438 | case offsetof(struct user_regs_struct, ds): | |
439 | case offsetof(struct user_regs_struct, es): | |
440 | case offsetof(struct user_regs_struct, fs): | |
441 | case offsetof(struct user_regs_struct, gs): | |
442 | case offsetof(struct user_regs_struct, ss): | |
443 | return get_segment_reg(task, offset); | |
444 | ||
445 | case offsetof(struct user_regs_struct, flags): | |
446 | return get_flags(task); | |
2047b08b RM |
447 | |
448 | #ifdef CONFIG_X86_64 | |
449 | case offsetof(struct user_regs_struct, fs_base): { | |
450 | /* | |
451 | * do_arch_prctl may have used a GDT slot instead of | |
452 | * the MSR. To userland, it appears the same either | |
453 | * way, except the %fs segment selector might not be 0. | |
454 | */ | |
455 | unsigned int seg = task->thread.fsindex; | |
456 | if (task->thread.fs != 0) | |
457 | return task->thread.fs; | |
458 | if (task == current) | |
459 | asm("movl %%fs,%0" : "=r" (seg)); | |
460 | if (seg != FS_TLS_SEL) | |
461 | return 0; | |
462 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
463 | } | |
464 | case offsetof(struct user_regs_struct, gs_base): { | |
465 | /* | |
466 | * Exactly the same here as the %fs handling above. | |
467 | */ | |
468 | unsigned int seg = task->thread.gsindex; | |
469 | if (task->thread.gs != 0) | |
470 | return task->thread.gs; | |
471 | if (task == current) | |
472 | asm("movl %%gs,%0" : "=r" (seg)); | |
473 | if (seg != GS_TLS_SEL) | |
474 | return 0; | |
475 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
476 | } | |
477 | #endif | |
06ee1b68 RM |
478 | } |
479 | ||
480 | return *pt_regs_access(task_pt_regs(task), offset); | |
481 | } | |
482 | ||
91e7b707 RM |
483 | static int genregs_get(struct task_struct *target, |
484 | const struct user_regset *regset, | |
485 | unsigned int pos, unsigned int count, | |
486 | void *kbuf, void __user *ubuf) | |
487 | { | |
488 | if (kbuf) { | |
489 | unsigned long *k = kbuf; | |
04a1e62c | 490 | while (count >= sizeof(*k)) { |
91e7b707 RM |
491 | *k++ = getreg(target, pos); |
492 | count -= sizeof(*k); | |
493 | pos += sizeof(*k); | |
494 | } | |
495 | } else { | |
496 | unsigned long __user *u = ubuf; | |
04a1e62c | 497 | while (count >= sizeof(*u)) { |
91e7b707 RM |
498 | if (__put_user(getreg(target, pos), u++)) |
499 | return -EFAULT; | |
500 | count -= sizeof(*u); | |
501 | pos += sizeof(*u); | |
502 | } | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | static int genregs_set(struct task_struct *target, | |
509 | const struct user_regset *regset, | |
510 | unsigned int pos, unsigned int count, | |
511 | const void *kbuf, const void __user *ubuf) | |
512 | { | |
513 | int ret = 0; | |
514 | if (kbuf) { | |
515 | const unsigned long *k = kbuf; | |
04a1e62c | 516 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
517 | ret = putreg(target, pos, *k++); |
518 | count -= sizeof(*k); | |
519 | pos += sizeof(*k); | |
520 | } | |
521 | } else { | |
522 | const unsigned long __user *u = ubuf; | |
04a1e62c | 523 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
524 | unsigned long word; |
525 | ret = __get_user(word, u++); | |
526 | if (ret) | |
527 | break; | |
528 | ret = putreg(target, pos, word); | |
529 | count -= sizeof(*u); | |
530 | pos += sizeof(*u); | |
531 | } | |
532 | } | |
533 | return ret; | |
534 | } | |
535 | ||
b326e956 FW |
536 | static void ptrace_triggered(struct perf_event *bp, int nmi, |
537 | struct perf_sample_data *data, | |
538 | struct pt_regs *regs) | |
d9771e8c | 539 | { |
0f534093 | 540 | int i; |
24f1e32c | 541 | struct thread_struct *thread = &(current->thread); |
0f534093 | 542 | |
72f674d2 P |
543 | /* |
544 | * Store in the virtual DR6 register the fact that the breakpoint | |
545 | * was hit so the thread's debugger will see it. | |
546 | */ | |
24f1e32c FW |
547 | for (i = 0; i < HBP_NUM; i++) { |
548 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 549 | break; |
24f1e32c | 550 | } |
d9771e8c | 551 | |
72f674d2 P |
552 | thread->debugreg6 |= (DR_TRAP0 << i); |
553 | } | |
d9771e8c | 554 | |
d9771e8c | 555 | /* |
24f1e32c FW |
556 | * Walk through every ptrace breakpoints for this thread and |
557 | * build the dr7 value on top of their attributes. | |
558 | * | |
d9771e8c | 559 | */ |
24f1e32c | 560 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 561 | { |
24f1e32c FW |
562 | int i; |
563 | int dr7 = 0; | |
564 | struct arch_hw_breakpoint *info; | |
565 | ||
566 | for (i = 0; i < HBP_NUM; i++) { | |
567 | if (bp[i] && !bp[i]->attr.disabled) { | |
568 | info = counter_arch_bp(bp[i]); | |
569 | dr7 |= encode_dr7(i, info->len, info->type); | |
570 | } | |
0f534093 | 571 | } |
24f1e32c FW |
572 | |
573 | return dr7; | |
d9771e8c RM |
574 | } |
575 | ||
44234adc | 576 | static int |
5fa10b28 | 577 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
1cedae72 | 578 | struct task_struct *tsk, int disabled) |
5fa10b28 FW |
579 | { |
580 | int err; | |
581 | int gen_len, gen_type; | |
b326e956 | 582 | struct perf_event_attr attr; |
5fa10b28 FW |
583 | |
584 | /* | |
c9404c9c | 585 | * We should have at least an inactive breakpoint at this |
5fa10b28 FW |
586 | * slot. It means the user is writing dr7 without having |
587 | * written the address register first | |
588 | */ | |
589 | if (!bp) | |
44234adc | 590 | return -EINVAL; |
5fa10b28 FW |
591 | |
592 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); | |
593 | if (err) | |
44234adc | 594 | return err; |
5fa10b28 FW |
595 | |
596 | attr = bp->attr; | |
597 | attr.bp_len = gen_len; | |
598 | attr.bp_type = gen_type; | |
1cedae72 | 599 | attr.disabled = disabled; |
5fa10b28 | 600 | |
2f0993e0 | 601 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
602 | } |
603 | ||
72f674d2 P |
604 | /* |
605 | * Handle ptrace writes to debug register 7. | |
606 | */ | |
607 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 608 | { |
72f674d2 | 609 | struct thread_struct *thread = &(tsk->thread); |
24f1e32c | 610 | unsigned long old_dr7; |
72f674d2 P |
611 | int i, orig_ret = 0, rc = 0; |
612 | int enabled, second_pass = 0; | |
613 | unsigned len, type; | |
24f1e32c | 614 | struct perf_event *bp; |
72f674d2 P |
615 | |
616 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 617 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
72f674d2 P |
618 | restore: |
619 | /* | |
620 | * Loop through all the hardware breakpoints, making the | |
621 | * appropriate changes to each. | |
622 | */ | |
623 | for (i = 0; i < HBP_NUM; i++) { | |
624 | enabled = decode_dr7(data, i, &len, &type); | |
24f1e32c | 625 | bp = thread->ptrace_bps[i]; |
72f674d2 P |
626 | |
627 | if (!enabled) { | |
628 | if (bp) { | |
24f1e32c FW |
629 | /* |
630 | * Don't unregister the breakpoints right-away, | |
72f674d2 P |
631 | * unless all register_user_hw_breakpoint() |
632 | * requests have succeeded. This prevents | |
633 | * any window of opportunity for debug | |
634 | * register grabbing by other users. | |
635 | */ | |
636 | if (!second_pass) | |
637 | continue; | |
1cedae72 | 638 | |
44234adc | 639 | rc = ptrace_modify_breakpoint(bp, len, type, |
1cedae72 | 640 | tsk, 1); |
44234adc | 641 | if (rc) |
1cedae72 | 642 | break; |
72f674d2 P |
643 | } |
644 | continue; | |
645 | } | |
0f534093 | 646 | |
44234adc FW |
647 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
648 | if (rc) | |
24f1e32c | 649 | break; |
72f674d2 P |
650 | } |
651 | /* | |
652 | * Make a second pass to free the remaining unused breakpoints | |
653 | * or to restore the original breakpoints if an error occurred. | |
654 | */ | |
655 | if (!second_pass) { | |
656 | second_pass = 1; | |
657 | if (rc < 0) { | |
658 | orig_ret = rc; | |
659 | data = old_dr7; | |
660 | } | |
661 | goto restore; | |
662 | } | |
663 | return ((orig_ret < 0) ? orig_ret : rc); | |
664 | } | |
0f534093 | 665 | |
72f674d2 P |
666 | /* |
667 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
668 | */ | |
9d22b536 | 669 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 P |
670 | { |
671 | struct thread_struct *thread = &(tsk->thread); | |
672 | unsigned long val = 0; | |
673 | ||
24f1e32c FW |
674 | if (n < HBP_NUM) { |
675 | struct perf_event *bp; | |
676 | bp = thread->ptrace_bps[n]; | |
677 | if (!bp) | |
678 | return 0; | |
679 | val = bp->hw.info.address; | |
680 | } else if (n == 6) { | |
72f674d2 | 681 | val = thread->debugreg6; |
24f1e32c | 682 | } else if (n == 7) { |
326264a0 | 683 | val = thread->ptrace_dr7; |
24f1e32c | 684 | } |
72f674d2 P |
685 | return val; |
686 | } | |
0f534093 | 687 | |
24f1e32c FW |
688 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
689 | unsigned long addr) | |
690 | { | |
691 | struct perf_event *bp; | |
692 | struct thread_struct *t = &tsk->thread; | |
b326e956 | 693 | struct perf_event_attr attr; |
24f1e32c FW |
694 | |
695 | if (!t->ptrace_bps[nr]) { | |
b326e956 | 696 | hw_breakpoint_init(&attr); |
d9771e8c | 697 | /* |
24f1e32c FW |
698 | * Put stub len and type to register (reserve) an inactive but |
699 | * correct bp | |
d9771e8c | 700 | */ |
5fa10b28 FW |
701 | attr.bp_addr = addr; |
702 | attr.bp_len = HW_BREAKPOINT_LEN_1; | |
703 | attr.bp_type = HW_BREAKPOINT_W; | |
704 | attr.disabled = 1; | |
705 | ||
706 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk); | |
44234adc FW |
707 | |
708 | /* | |
709 | * CHECKME: the previous code returned -EIO if the addr wasn't | |
710 | * a valid task virtual addr. The new one will return -EINVAL in | |
711 | * this case. | |
712 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
713 | * but -EIO looks better for ptrace, since we refuse a register | |
714 | * writing for the user. And anyway this is the previous | |
715 | * behaviour. | |
716 | */ | |
717 | if (IS_ERR(bp)) | |
718 | return PTR_ERR(bp); | |
719 | ||
720 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 721 | } else { |
44234adc FW |
722 | int err; |
723 | ||
24f1e32c | 724 | bp = t->ptrace_bps[nr]; |
5fa10b28 FW |
725 | |
726 | attr = bp->attr; | |
727 | attr.bp_addr = addr; | |
44234adc FW |
728 | err = modify_user_hw_breakpoint(bp, &attr); |
729 | if (err) | |
730 | return err; | |
d9771e8c | 731 | } |
24f1e32c | 732 | |
24f1e32c | 733 | |
d9771e8c RM |
734 | return 0; |
735 | } | |
736 | ||
72f674d2 P |
737 | /* |
738 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
739 | */ | |
740 | int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val) | |
741 | { | |
742 | struct thread_struct *thread = &(tsk->thread); | |
743 | int rc = 0; | |
744 | ||
745 | /* There are no DR4 or DR5 registers */ | |
746 | if (n == 4 || n == 5) | |
747 | return -EIO; | |
748 | ||
749 | if (n == 6) { | |
24f1e32c | 750 | thread->debugreg6 = val; |
72f674d2 | 751 | goto ret_path; |
d9771e8c | 752 | } |
72f674d2 | 753 | if (n < HBP_NUM) { |
24f1e32c FW |
754 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
755 | if (rc) | |
756 | return rc; | |
72f674d2 P |
757 | } |
758 | /* All that's left is DR7 */ | |
326264a0 | 759 | if (n == 7) { |
72f674d2 | 760 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
761 | if (!rc) |
762 | thread->ptrace_dr7 = val; | |
763 | } | |
d9771e8c | 764 | |
72f674d2 P |
765 | ret_path: |
766 | return rc; | |
d9771e8c RM |
767 | } |
768 | ||
325af5fb RM |
769 | /* |
770 | * These access the current or another (stopped) task's io permission | |
771 | * bitmap for debugging or core dump. | |
772 | */ | |
773 | static int ioperm_active(struct task_struct *target, | |
774 | const struct user_regset *regset) | |
775 | { | |
776 | return target->thread.io_bitmap_max / regset->size; | |
777 | } | |
b4ef95de | 778 | |
325af5fb RM |
779 | static int ioperm_get(struct task_struct *target, |
780 | const struct user_regset *regset, | |
781 | unsigned int pos, unsigned int count, | |
782 | void *kbuf, void __user *ubuf) | |
eee3af4a | 783 | { |
325af5fb | 784 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
785 | return -ENXIO; |
786 | ||
325af5fb RM |
787 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
788 | target->thread.io_bitmap_ptr, | |
789 | 0, IO_BITMAP_BYTES); | |
790 | } | |
791 | ||
93fa7636 | 792 | #ifdef CONFIG_X86_PTRACE_BTS |
e2b371f0 MM |
793 | /* |
794 | * A branch trace store context. | |
795 | * | |
796 | * Contexts may only be installed by ptrace_bts_config() and only for | |
797 | * ptraced tasks. | |
798 | * | |
799 | * Contexts are destroyed when the tracee is detached from the tracer. | |
800 | * The actual destruction work requires interrupts enabled, so the | |
801 | * work is deferred and will be scheduled during __ptrace_unlink(). | |
802 | * | |
803 | * Contexts hold an additional task_struct reference on the traced | |
804 | * task, as well as a reference on the tracer's mm. | |
805 | * | |
806 | * Ptrace already holds a task_struct for the duration of ptrace operations, | |
807 | * but since destruction is deferred, it may be executed after both | |
808 | * tracer and tracee exited. | |
809 | */ | |
810 | struct bts_context { | |
811 | /* The branch trace handle. */ | |
812 | struct bts_tracer *tracer; | |
813 | ||
814 | /* The buffer used to store the branch trace and its size. */ | |
815 | void *buffer; | |
816 | unsigned int size; | |
817 | ||
818 | /* The mm that paid for the above buffer. */ | |
819 | struct mm_struct *mm; | |
820 | ||
821 | /* The task this context belongs to. */ | |
822 | struct task_struct *task; | |
823 | ||
824 | /* The signal to send on a bts buffer overflow. */ | |
825 | unsigned int bts_ovfl_signal; | |
826 | ||
827 | /* The work struct to destroy a context. */ | |
828 | struct work_struct work; | |
829 | }; | |
830 | ||
1cb81b14 | 831 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
e2b371f0 | 832 | { |
1cb81b14 MM |
833 | void *buffer = NULL; |
834 | int err = -ENOMEM; | |
e2b371f0 | 835 | |
1cb81b14 MM |
836 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
837 | if (err < 0) | |
838 | return err; | |
839 | ||
840 | buffer = kzalloc(size, GFP_KERNEL); | |
841 | if (!buffer) | |
842 | goto out_refund; | |
843 | ||
844 | context->buffer = buffer; | |
845 | context->size = size; | |
846 | context->mm = get_task_mm(current); | |
847 | ||
848 | return 0; | |
849 | ||
850 | out_refund: | |
851 | refund_locked_memory(current->mm, size); | |
852 | return err; | |
e2b371f0 MM |
853 | } |
854 | ||
855 | static inline void free_bts_buffer(struct bts_context *context) | |
856 | { | |
857 | if (!context->buffer) | |
858 | return; | |
859 | ||
860 | kfree(context->buffer); | |
861 | context->buffer = NULL; | |
862 | ||
1cb81b14 | 863 | refund_locked_memory(context->mm, context->size); |
e2b371f0 MM |
864 | context->size = 0; |
865 | ||
866 | mmput(context->mm); | |
867 | context->mm = NULL; | |
868 | } | |
869 | ||
870 | static void free_bts_context_work(struct work_struct *w) | |
871 | { | |
872 | struct bts_context *context; | |
873 | ||
874 | context = container_of(w, struct bts_context, work); | |
875 | ||
876 | ds_release_bts(context->tracer); | |
877 | put_task_struct(context->task); | |
878 | free_bts_buffer(context); | |
879 | kfree(context); | |
880 | } | |
881 | ||
882 | static inline void free_bts_context(struct bts_context *context) | |
883 | { | |
884 | INIT_WORK(&context->work, free_bts_context_work); | |
885 | schedule_work(&context->work); | |
886 | } | |
887 | ||
888 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) | |
889 | { | |
890 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); | |
891 | if (context) { | |
892 | context->task = task; | |
893 | task->bts = context; | |
894 | ||
895 | get_task_struct(task); | |
896 | } | |
897 | ||
898 | return context; | |
899 | } | |
900 | ||
93fa7636 | 901 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
902 | struct bts_struct __user *out) |
903 | { | |
e2b371f0 | 904 | struct bts_context *context; |
c2724775 MM |
905 | const struct bts_trace *trace; |
906 | struct bts_struct bts; | |
907 | const unsigned char *at; | |
93fa7636 | 908 | int error; |
eee3af4a | 909 | |
e2b371f0 MM |
910 | context = child->bts; |
911 | if (!context) | |
912 | return -ESRCH; | |
913 | ||
914 | trace = ds_read_bts(context->tracer); | |
c2724775 | 915 | if (!trace) |
e2b371f0 | 916 | return -ESRCH; |
e4811f25 | 917 | |
c2724775 MM |
918 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
919 | if ((void *)at < trace->ds.begin) | |
920 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 921 | |
c2724775 MM |
922 | if (!trace->read) |
923 | return -EOPNOTSUPP; | |
93fa7636 | 924 | |
e2b371f0 | 925 | error = trace->read(context->tracer, at, &bts); |
93fa7636 MM |
926 | if (error < 0) |
927 | return error; | |
e4811f25 | 928 | |
c2724775 | 929 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
930 | return -EFAULT; |
931 | ||
c2724775 | 932 | return sizeof(bts); |
eee3af4a MM |
933 | } |
934 | ||
a95d67f8 | 935 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 936 | long size, |
a95d67f8 MM |
937 | struct bts_struct __user *out) |
938 | { | |
e2b371f0 | 939 | struct bts_context *context; |
c2724775 MM |
940 | const struct bts_trace *trace; |
941 | const unsigned char *at; | |
942 | int error, drained = 0; | |
eee3af4a | 943 | |
e2b371f0 MM |
944 | context = child->bts; |
945 | if (!context) | |
946 | return -ESRCH; | |
947 | ||
948 | trace = ds_read_bts(context->tracer); | |
c2724775 | 949 | if (!trace) |
e2b371f0 | 950 | return -ESRCH; |
a95d67f8 | 951 | |
c2724775 MM |
952 | if (!trace->read) |
953 | return -EOPNOTSUPP; | |
954 | ||
955 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
956 | return -EIO; |
957 | ||
c2724775 MM |
958 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
959 | out++, drained++, at += trace->ds.size) { | |
960 | struct bts_struct bts; | |
a95d67f8 | 961 | |
e2b371f0 | 962 | error = trace->read(context->tracer, at, &bts); |
c2724775 MM |
963 | if (error < 0) |
964 | return error; | |
a95d67f8 | 965 | |
c2724775 | 966 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
967 | return -EFAULT; |
968 | } | |
969 | ||
c2724775 MM |
970 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
971 | ||
e2b371f0 | 972 | error = ds_reset_bts(context->tracer); |
93fa7636 MM |
973 | if (error < 0) |
974 | return error; | |
a95d67f8 | 975 | |
c2724775 | 976 | return drained; |
a95d67f8 MM |
977 | } |
978 | ||
979 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 980 | long cfg_size, |
a95d67f8 MM |
981 | const struct ptrace_bts_config __user *ucfg) |
982 | { | |
e2b371f0 | 983 | struct bts_context *context; |
a95d67f8 | 984 | struct ptrace_bts_config cfg; |
c2724775 | 985 | unsigned int flags = 0; |
a95d67f8 | 986 | |
cba4b65d | 987 | if (cfg_size < sizeof(cfg)) |
c2724775 | 988 | return -EIO; |
cba4b65d | 989 | |
a95d67f8 | 990 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 991 | return -EFAULT; |
6abb11ae | 992 | |
e2b371f0 MM |
993 | context = child->bts; |
994 | if (!context) | |
995 | context = alloc_bts_context(child); | |
996 | if (!context) | |
997 | return -ENOMEM; | |
93fa7636 | 998 | |
c2724775 MM |
999 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
1000 | if (!cfg.signal) | |
1001 | return -EINVAL; | |
ca0002a1 | 1002 | |
5a8ac9d2 | 1003 | return -EOPNOTSUPP; |
e2b371f0 | 1004 | context->bts_ovfl_signal = cfg.signal; |
c2724775 | 1005 | } |
6abb11ae | 1006 | |
e2b371f0 MM |
1007 | ds_release_bts(context->tracer); |
1008 | context->tracer = NULL; | |
6abb11ae | 1009 | |
e2b371f0 | 1010 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
1cb81b14 MM |
1011 | int err; |
1012 | ||
e2b371f0 MM |
1013 | free_bts_buffer(context); |
1014 | if (!cfg.size) | |
1015 | return 0; | |
c5dee617 | 1016 | |
1cb81b14 MM |
1017 | err = alloc_bts_buffer(context, cfg.size); |
1018 | if (err < 0) | |
1019 | return err; | |
a95d67f8 MM |
1020 | } |
1021 | ||
da35c371 | 1022 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 1023 | flags |= BTS_USER; |
eee3af4a | 1024 | |
da35c371 | 1025 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 1026 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 1027 | |
de79f54f MM |
1028 | context->tracer = |
1029 | ds_request_bts_task(child, context->buffer, context->size, | |
1030 | NULL, (size_t)-1, flags); | |
e2b371f0 MM |
1031 | if (unlikely(IS_ERR(context->tracer))) { |
1032 | int error = PTR_ERR(context->tracer); | |
da35c371 | 1033 | |
e2b371f0 MM |
1034 | free_bts_buffer(context); |
1035 | context->tracer = NULL; | |
c2724775 MM |
1036 | return error; |
1037 | } | |
da35c371 | 1038 | |
c2724775 | 1039 | return sizeof(cfg); |
eee3af4a MM |
1040 | } |
1041 | ||
a95d67f8 | 1042 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 1043 | long cfg_size, |
a95d67f8 | 1044 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 1045 | { |
e2b371f0 | 1046 | struct bts_context *context; |
c2724775 | 1047 | const struct bts_trace *trace; |
a95d67f8 | 1048 | struct ptrace_bts_config cfg; |
eee3af4a | 1049 | |
e2b371f0 MM |
1050 | context = child->bts; |
1051 | if (!context) | |
1052 | return -ESRCH; | |
1053 | ||
cba4b65d MM |
1054 | if (cfg_size < sizeof(cfg)) |
1055 | return -EIO; | |
1056 | ||
e2b371f0 | 1057 | trace = ds_read_bts(context->tracer); |
c2724775 | 1058 | if (!trace) |
e2b371f0 | 1059 | return -ESRCH; |
eee3af4a | 1060 | |
93fa7636 | 1061 | memset(&cfg, 0, sizeof(cfg)); |
e2b371f0 MM |
1062 | cfg.size = trace->ds.end - trace->ds.begin; |
1063 | cfg.signal = context->bts_ovfl_signal; | |
1064 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 1065 | |
93fa7636 MM |
1066 | if (cfg.signal) |
1067 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 1068 | |
c2724775 | 1069 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
1070 | cfg.flags |= PTRACE_BTS_O_TRACE; |
1071 | ||
c2724775 | 1072 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 1073 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 1074 | |
a95d67f8 MM |
1075 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
1076 | return -EFAULT; | |
eee3af4a | 1077 | |
a95d67f8 | 1078 | return sizeof(cfg); |
eee3af4a MM |
1079 | } |
1080 | ||
c2724775 | 1081 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 1082 | { |
e2b371f0 | 1083 | struct bts_context *context; |
c2724775 | 1084 | const struct bts_trace *trace; |
d8d4f157 | 1085 | |
e2b371f0 MM |
1086 | context = child->bts; |
1087 | if (!context) | |
1088 | return -ESRCH; | |
1089 | ||
1090 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1091 | if (!trace) |
e2b371f0 | 1092 | return -ESRCH; |
d8d4f157 | 1093 | |
c2724775 | 1094 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 1095 | |
e2b371f0 | 1096 | return ds_reset_bts(context->tracer); |
d8d4f157 AM |
1097 | } |
1098 | ||
c2724775 | 1099 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 1100 | { |
e2b371f0 | 1101 | struct bts_context *context; |
c2724775 | 1102 | const struct bts_trace *trace; |
93fa7636 | 1103 | |
e2b371f0 MM |
1104 | context = child->bts; |
1105 | if (!context) | |
1106 | return -ESRCH; | |
1107 | ||
1108 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1109 | if (!trace) |
e2b371f0 | 1110 | return -ESRCH; |
93fa7636 | 1111 | |
c2724775 | 1112 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 1113 | } |
bf53de90 | 1114 | |
e2b371f0 MM |
1115 | /* |
1116 | * Called from __ptrace_unlink() after the child has been moved back | |
1117 | * to its original parent. | |
1118 | */ | |
0f481406 | 1119 | void ptrace_bts_untrace(struct task_struct *child) |
bf53de90 MM |
1120 | { |
1121 | if (unlikely(child->bts)) { | |
e2b371f0 | 1122 | free_bts_context(child->bts); |
bf53de90 | 1123 | child->bts = NULL; |
bf53de90 MM |
1124 | } |
1125 | } | |
93fa7636 | 1126 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1127 | |
1da177e4 LT |
1128 | /* |
1129 | * Called by kernel/ptrace.c when detaching.. | |
1130 | * | |
1131 | * Make sure the single step bit is not set. | |
1132 | */ | |
1133 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 1134 | { |
7f232343 | 1135 | user_disable_single_step(child); |
e9c86c78 | 1136 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 1137 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 1138 | #endif |
1da177e4 LT |
1139 | } |
1140 | ||
5a4646a4 RM |
1141 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1142 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
1143 | #endif | |
1144 | ||
481bed45 | 1145 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 1146 | { |
5a4646a4 | 1147 | int ret; |
1da177e4 LT |
1148 | unsigned long __user *datap = (unsigned long __user *)data; |
1149 | ||
1da177e4 | 1150 | switch (request) { |
1da177e4 LT |
1151 | /* read the word at location addr in the USER area. */ |
1152 | case PTRACE_PEEKUSR: { | |
1153 | unsigned long tmp; | |
1154 | ||
1155 | ret = -EIO; | |
e9c86c78 RM |
1156 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1157 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1158 | break; |
1159 | ||
1160 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 1161 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1162 | tmp = getreg(child, addr); |
e9c86c78 RM |
1163 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1164 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1165 | addr -= offsetof(struct user, u_debugreg[0]); | |
1166 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
1167 | } |
1168 | ret = put_user(tmp, datap); | |
1169 | break; | |
1170 | } | |
1171 | ||
1da177e4 LT |
1172 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
1173 | ret = -EIO; | |
e9c86c78 RM |
1174 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1175 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1176 | break; |
1177 | ||
e9c86c78 | 1178 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1179 | ret = putreg(child, addr, data); |
e9c86c78 RM |
1180 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1181 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1182 | addr -= offsetof(struct user, u_debugreg[0]); | |
1183 | ret = ptrace_set_debugreg(child, | |
1184 | addr / sizeof(data), data); | |
1da177e4 | 1185 | } |
e9c86c78 | 1186 | break; |
1da177e4 | 1187 | |
5a4646a4 RM |
1188 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1189 | return copy_regset_to_user(child, | |
1190 | task_user_regset_view(current), | |
1191 | REGSET_GENERAL, | |
1192 | 0, sizeof(struct user_regs_struct), | |
1193 | datap); | |
1194 | ||
1195 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1196 | return copy_regset_from_user(child, | |
1197 | task_user_regset_view(current), | |
1198 | REGSET_GENERAL, | |
1199 | 0, sizeof(struct user_regs_struct), | |
1200 | datap); | |
1201 | ||
1202 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1203 | return copy_regset_to_user(child, | |
1204 | task_user_regset_view(current), | |
1205 | REGSET_FP, | |
1206 | 0, sizeof(struct user_i387_struct), | |
1207 | datap); | |
1208 | ||
1209 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1210 | return copy_regset_from_user(child, | |
1211 | task_user_regset_view(current), | |
1212 | REGSET_FP, | |
1213 | 0, sizeof(struct user_i387_struct), | |
1214 | datap); | |
1da177e4 | 1215 | |
e9c86c78 | 1216 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
1217 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
1218 | return copy_regset_to_user(child, &user_x86_32_view, | |
1219 | REGSET_XFP, | |
1220 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1221 | datap) ? -EIO : 0; |
5a4646a4 RM |
1222 | |
1223 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1224 | return copy_regset_from_user(child, &user_x86_32_view, | |
1225 | REGSET_XFP, | |
1226 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1227 | datap) ? -EIO : 0; |
e9c86c78 | 1228 | #endif |
1da177e4 | 1229 | |
e9c86c78 | 1230 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 1231 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
1232 | if (addr < 0) |
1233 | return -EIO; | |
1234 | ret = do_get_thread_area(child, addr, | |
1235 | (struct user_desc __user *) data); | |
1da177e4 LT |
1236 | break; |
1237 | ||
1238 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
1239 | if (addr < 0) |
1240 | return -EIO; | |
1241 | ret = do_set_thread_area(child, addr, | |
1242 | (struct user_desc __user *) data, 0); | |
1da177e4 | 1243 | break; |
e9c86c78 RM |
1244 | #endif |
1245 | ||
1246 | #ifdef CONFIG_X86_64 | |
1247 | /* normal 64bit interface to access TLS data. | |
1248 | Works just like arch_prctl, except that the arguments | |
1249 | are reversed. */ | |
1250 | case PTRACE_ARCH_PRCTL: | |
1251 | ret = do_arch_prctl(child, data, addr); | |
1252 | break; | |
1253 | #endif | |
1da177e4 | 1254 | |
b4ef95de IM |
1255 | /* |
1256 | * These bits need more cooking - not enabled yet: | |
1257 | */ | |
93fa7636 | 1258 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
1259 | case PTRACE_BTS_CONFIG: |
1260 | ret = ptrace_bts_config | |
cba4b65d | 1261 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1262 | break; |
1263 | ||
a95d67f8 MM |
1264 | case PTRACE_BTS_STATUS: |
1265 | ret = ptrace_bts_status | |
cba4b65d | 1266 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1267 | break; |
1268 | ||
c2724775 MM |
1269 | case PTRACE_BTS_SIZE: |
1270 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
1271 | break; |
1272 | ||
a95d67f8 | 1273 | case PTRACE_BTS_GET: |
eee3af4a | 1274 | ret = ptrace_bts_read_record |
a95d67f8 | 1275 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1276 | break; |
1277 | ||
a95d67f8 | 1278 | case PTRACE_BTS_CLEAR: |
c2724775 | 1279 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
1280 | break; |
1281 | ||
a95d67f8 MM |
1282 | case PTRACE_BTS_DRAIN: |
1283 | ret = ptrace_bts_drain | |
cba4b65d | 1284 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1285 | break; |
93fa7636 | 1286 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1287 | |
1da177e4 LT |
1288 | default: |
1289 | ret = ptrace_request(child, request, addr, data); | |
1290 | break; | |
1291 | } | |
d9771e8c | 1292 | |
1da177e4 LT |
1293 | return ret; |
1294 | } | |
1295 | ||
cb757c41 RM |
1296 | #ifdef CONFIG_IA32_EMULATION |
1297 | ||
099cd6e9 RM |
1298 | #include <linux/compat.h> |
1299 | #include <linux/syscalls.h> | |
1300 | #include <asm/ia32.h> | |
cb757c41 RM |
1301 | #include <asm/user32.h> |
1302 | ||
1303 | #define R32(l,q) \ | |
1304 | case offsetof(struct user32, regs.l): \ | |
1305 | regs->q = value; break | |
1306 | ||
1307 | #define SEG32(rs) \ | |
1308 | case offsetof(struct user32, regs.rs): \ | |
1309 | return set_segment_reg(child, \ | |
1310 | offsetof(struct user_regs_struct, rs), \ | |
1311 | value); \ | |
1312 | break | |
1313 | ||
1314 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1315 | { | |
1316 | struct pt_regs *regs = task_pt_regs(child); | |
1317 | ||
1318 | switch (regno) { | |
1319 | ||
1320 | SEG32(cs); | |
1321 | SEG32(ds); | |
1322 | SEG32(es); | |
1323 | SEG32(fs); | |
1324 | SEG32(gs); | |
1325 | SEG32(ss); | |
1326 | ||
1327 | R32(ebx, bx); | |
1328 | R32(ecx, cx); | |
1329 | R32(edx, dx); | |
1330 | R32(edi, di); | |
1331 | R32(esi, si); | |
1332 | R32(ebp, bp); | |
1333 | R32(eax, ax); | |
cb757c41 RM |
1334 | R32(eip, ip); |
1335 | R32(esp, sp); | |
1336 | ||
40f0933d RM |
1337 | case offsetof(struct user32, regs.orig_eax): |
1338 | /* | |
8cb3ed13 RM |
1339 | * A 32-bit debugger setting orig_eax means to restore |
1340 | * the state of the task restarting a 32-bit syscall. | |
1341 | * Make sure we interpret the -ERESTART* codes correctly | |
1342 | * in case the task is not actually still sitting at the | |
1343 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 1344 | */ |
8cb3ed13 RM |
1345 | regs->orig_ax = value; |
1346 | if (syscall_get_nr(child, regs) >= 0) | |
1347 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
1348 | break; |
1349 | ||
cb757c41 RM |
1350 | case offsetof(struct user32, regs.eflags): |
1351 | return set_flags(child, value); | |
1352 | ||
1353 | case offsetof(struct user32, u_debugreg[0]) ... | |
1354 | offsetof(struct user32, u_debugreg[7]): | |
1355 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1356 | return ptrace_set_debugreg(child, regno / 4, value); | |
1357 | ||
1358 | default: | |
1359 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1360 | return -EIO; | |
1361 | ||
1362 | /* | |
1363 | * Other dummy fields in the virtual user structure | |
1364 | * are ignored | |
1365 | */ | |
1366 | break; | |
1367 | } | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | #undef R32 | |
1372 | #undef SEG32 | |
1373 | ||
1374 | #define R32(l,q) \ | |
1375 | case offsetof(struct user32, regs.l): \ | |
1376 | *val = regs->q; break | |
1377 | ||
1378 | #define SEG32(rs) \ | |
1379 | case offsetof(struct user32, regs.rs): \ | |
1380 | *val = get_segment_reg(child, \ | |
1381 | offsetof(struct user_regs_struct, rs)); \ | |
1382 | break | |
1383 | ||
1384 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1385 | { | |
1386 | struct pt_regs *regs = task_pt_regs(child); | |
1387 | ||
1388 | switch (regno) { | |
1389 | ||
1390 | SEG32(ds); | |
1391 | SEG32(es); | |
1392 | SEG32(fs); | |
1393 | SEG32(gs); | |
1394 | ||
1395 | R32(cs, cs); | |
1396 | R32(ss, ss); | |
1397 | R32(ebx, bx); | |
1398 | R32(ecx, cx); | |
1399 | R32(edx, dx); | |
1400 | R32(edi, di); | |
1401 | R32(esi, si); | |
1402 | R32(ebp, bp); | |
1403 | R32(eax, ax); | |
1404 | R32(orig_eax, orig_ax); | |
1405 | R32(eip, ip); | |
1406 | R32(esp, sp); | |
1407 | ||
1408 | case offsetof(struct user32, regs.eflags): | |
1409 | *val = get_flags(child); | |
1410 | break; | |
1411 | ||
1412 | case offsetof(struct user32, u_debugreg[0]) ... | |
1413 | offsetof(struct user32, u_debugreg[7]): | |
1414 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1415 | *val = ptrace_get_debugreg(child, regno / 4); | |
1416 | break; | |
1417 | ||
1418 | default: | |
1419 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1420 | return -EIO; | |
1421 | ||
1422 | /* | |
1423 | * Other dummy fields in the virtual user structure | |
1424 | * are ignored | |
1425 | */ | |
1426 | *val = 0; | |
1427 | break; | |
1428 | } | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | #undef R32 | |
1433 | #undef SEG32 | |
1434 | ||
91e7b707 RM |
1435 | static int genregs32_get(struct task_struct *target, |
1436 | const struct user_regset *regset, | |
1437 | unsigned int pos, unsigned int count, | |
1438 | void *kbuf, void __user *ubuf) | |
1439 | { | |
1440 | if (kbuf) { | |
1441 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1442 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1443 | getreg32(target, pos, k++); |
1444 | count -= sizeof(*k); | |
1445 | pos += sizeof(*k); | |
1446 | } | |
1447 | } else { | |
1448 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1449 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1450 | compat_ulong_t word; |
1451 | getreg32(target, pos, &word); | |
1452 | if (__put_user(word, u++)) | |
1453 | return -EFAULT; | |
1454 | count -= sizeof(*u); | |
1455 | pos += sizeof(*u); | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | static int genregs32_set(struct task_struct *target, | |
1463 | const struct user_regset *regset, | |
1464 | unsigned int pos, unsigned int count, | |
1465 | const void *kbuf, const void __user *ubuf) | |
1466 | { | |
1467 | int ret = 0; | |
1468 | if (kbuf) { | |
1469 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1470 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1471 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1472 | count -= sizeof(*k); |
1473 | pos += sizeof(*k); | |
1474 | } | |
1475 | } else { | |
1476 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1477 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1478 | compat_ulong_t word; |
1479 | ret = __get_user(word, u++); | |
1480 | if (ret) | |
1481 | break; | |
f9cb02b0 | 1482 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1483 | count -= sizeof(*u); |
1484 | pos += sizeof(*u); | |
1485 | } | |
1486 | } | |
1487 | return ret; | |
1488 | } | |
1489 | ||
562b80ba RM |
1490 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1491 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1492 | { |
562b80ba RM |
1493 | unsigned long addr = caddr; |
1494 | unsigned long data = cdata; | |
099cd6e9 RM |
1495 | void __user *datap = compat_ptr(data); |
1496 | int ret; | |
1497 | __u32 val; | |
1498 | ||
099cd6e9 | 1499 | switch (request) { |
099cd6e9 RM |
1500 | case PTRACE_PEEKUSR: |
1501 | ret = getreg32(child, addr, &val); | |
1502 | if (ret == 0) | |
1503 | ret = put_user(val, (__u32 __user *)datap); | |
1504 | break; | |
1505 | ||
1506 | case PTRACE_POKEUSR: | |
1507 | ret = putreg32(child, addr, data); | |
1508 | break; | |
1509 | ||
5a4646a4 RM |
1510 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1511 | return copy_regset_to_user(child, &user_x86_32_view, | |
1512 | REGSET_GENERAL, | |
1513 | 0, sizeof(struct user_regs_struct32), | |
1514 | datap); | |
1515 | ||
1516 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1517 | return copy_regset_from_user(child, &user_x86_32_view, | |
1518 | REGSET_GENERAL, 0, | |
1519 | sizeof(struct user_regs_struct32), | |
1520 | datap); | |
1521 | ||
1522 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1523 | return copy_regset_to_user(child, &user_x86_32_view, | |
1524 | REGSET_FP, 0, | |
1525 | sizeof(struct user_i387_ia32_struct), | |
1526 | datap); | |
1527 | ||
1528 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1529 | return copy_regset_from_user( | |
1530 | child, &user_x86_32_view, REGSET_FP, | |
1531 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1532 | ||
1533 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1534 | return copy_regset_to_user(child, &user_x86_32_view, | |
1535 | REGSET_XFP, 0, | |
1536 | sizeof(struct user32_fxsr_struct), | |
1537 | datap); | |
1538 | ||
1539 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1540 | return copy_regset_from_user(child, &user_x86_32_view, | |
1541 | REGSET_XFP, 0, | |
1542 | sizeof(struct user32_fxsr_struct), | |
1543 | datap); | |
099cd6e9 | 1544 | |
562b80ba RM |
1545 | case PTRACE_GET_THREAD_AREA: |
1546 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1547 | #ifdef CONFIG_X86_PTRACE_BTS |
1548 | case PTRACE_BTS_CONFIG: | |
1549 | case PTRACE_BTS_STATUS: | |
1550 | case PTRACE_BTS_SIZE: | |
1551 | case PTRACE_BTS_GET: | |
1552 | case PTRACE_BTS_CLEAR: | |
1553 | case PTRACE_BTS_DRAIN: | |
1554 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1555 | return arch_ptrace(child, request, addr, data); |
1556 | ||
099cd6e9 | 1557 | default: |
fdadd54d | 1558 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1559 | } |
1560 | ||
099cd6e9 RM |
1561 | return ret; |
1562 | } | |
1563 | ||
cb757c41 RM |
1564 | #endif /* CONFIG_IA32_EMULATION */ |
1565 | ||
070459d9 RM |
1566 | #ifdef CONFIG_X86_64 |
1567 | ||
5b3efd50 | 1568 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1569 | [REGSET_GENERAL] = { |
1570 | .core_note_type = NT_PRSTATUS, | |
1571 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1572 | .size = sizeof(long), .align = sizeof(long), | |
1573 | .get = genregs_get, .set = genregs_set | |
1574 | }, | |
1575 | [REGSET_FP] = { | |
1576 | .core_note_type = NT_PRFPREG, | |
1577 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1578 | .size = sizeof(long), .align = sizeof(long), | |
1579 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1580 | }, | |
5b3efd50 SS |
1581 | [REGSET_XSTATE] = { |
1582 | .core_note_type = NT_X86_XSTATE, | |
1583 | .size = sizeof(u64), .align = sizeof(u64), | |
1584 | .active = xstateregs_active, .get = xstateregs_get, | |
1585 | .set = xstateregs_set | |
1586 | }, | |
325af5fb RM |
1587 | [REGSET_IOPERM64] = { |
1588 | .core_note_type = NT_386_IOPERM, | |
1589 | .n = IO_BITMAP_LONGS, | |
1590 | .size = sizeof(long), .align = sizeof(long), | |
1591 | .active = ioperm_active, .get = ioperm_get | |
1592 | }, | |
070459d9 RM |
1593 | }; |
1594 | ||
1595 | static const struct user_regset_view user_x86_64_view = { | |
1596 | .name = "x86_64", .e_machine = EM_X86_64, | |
1597 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1598 | }; | |
1599 | ||
1600 | #else /* CONFIG_X86_32 */ | |
1601 | ||
1602 | #define user_regs_struct32 user_regs_struct | |
1603 | #define genregs32_get genregs_get | |
1604 | #define genregs32_set genregs_set | |
1605 | ||
1f465f4e RM |
1606 | #define user_i387_ia32_struct user_i387_struct |
1607 | #define user32_fxsr_struct user_fxsr_struct | |
1608 | ||
070459d9 RM |
1609 | #endif /* CONFIG_X86_64 */ |
1610 | ||
1611 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1612 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1613 | [REGSET_GENERAL] = { |
1614 | .core_note_type = NT_PRSTATUS, | |
1615 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1616 | .size = sizeof(u32), .align = sizeof(u32), | |
1617 | .get = genregs32_get, .set = genregs32_set | |
1618 | }, | |
1619 | [REGSET_FP] = { | |
1620 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1621 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1622 | .size = sizeof(u32), .align = sizeof(u32), |
1623 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1624 | }, | |
1625 | [REGSET_XFP] = { | |
1626 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1627 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1628 | .size = sizeof(u32), .align = sizeof(u32), |
1629 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1630 | }, | |
5b3efd50 SS |
1631 | [REGSET_XSTATE] = { |
1632 | .core_note_type = NT_X86_XSTATE, | |
1633 | .size = sizeof(u64), .align = sizeof(u64), | |
1634 | .active = xstateregs_active, .get = xstateregs_get, | |
1635 | .set = xstateregs_set | |
1636 | }, | |
070459d9 | 1637 | [REGSET_TLS] = { |
bb61682b | 1638 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1639 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1640 | .size = sizeof(struct user_desc), | |
1641 | .align = sizeof(struct user_desc), | |
1642 | .active = regset_tls_active, | |
1643 | .get = regset_tls_get, .set = regset_tls_set | |
1644 | }, | |
325af5fb RM |
1645 | [REGSET_IOPERM32] = { |
1646 | .core_note_type = NT_386_IOPERM, | |
1647 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1648 | .size = sizeof(u32), .align = sizeof(u32), | |
1649 | .active = ioperm_active, .get = ioperm_get | |
1650 | }, | |
070459d9 RM |
1651 | }; |
1652 | ||
1653 | static const struct user_regset_view user_x86_32_view = { | |
1654 | .name = "i386", .e_machine = EM_386, | |
1655 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1656 | }; | |
1657 | #endif | |
1658 | ||
5b3efd50 SS |
1659 | /* |
1660 | * This represents bytes 464..511 in the memory layout exported through | |
1661 | * the REGSET_XSTATE interface. | |
1662 | */ | |
1663 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1664 | ||
1665 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1666 | { | |
1667 | #ifdef CONFIG_X86_64 | |
1668 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1669 | #endif | |
1670 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1671 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1672 | #endif | |
1673 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1674 | } | |
1675 | ||
070459d9 RM |
1676 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1677 | { | |
1678 | #ifdef CONFIG_IA32_EMULATION | |
1679 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1680 | #endif | |
1681 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1682 | return &user_x86_32_view; | |
1683 | #endif | |
1684 | #ifdef CONFIG_X86_64 | |
1685 | return &user_x86_64_view; | |
1686 | #endif | |
1687 | } | |
1688 | ||
7f38551f ON |
1689 | static void fill_sigtrap_info(struct task_struct *tsk, |
1690 | struct pt_regs *regs, | |
1691 | int error_code, int si_code, | |
1692 | struct siginfo *info) | |
1da177e4 | 1693 | { |
1da177e4 LT |
1694 | tsk->thread.trap_no = 1; |
1695 | tsk->thread.error_code = error_code; | |
1696 | ||
7f38551f ON |
1697 | memset(info, 0, sizeof(*info)); |
1698 | info->si_signo = SIGTRAP; | |
1699 | info->si_code = si_code; | |
1700 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1701 | } | |
1702 | ||
1703 | void user_single_step_siginfo(struct task_struct *tsk, | |
1704 | struct pt_regs *regs, | |
1705 | struct siginfo *info) | |
1706 | { | |
1707 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1708 | } | |
1da177e4 | 1709 | |
7f38551f ON |
1710 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1711 | int error_code, int si_code) | |
1712 | { | |
1713 | struct siginfo info; | |
1da177e4 | 1714 | |
7f38551f | 1715 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1716 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1717 | force_sig_info(SIGTRAP, &info, tsk); |
1718 | } | |
1719 | ||
86976cd8 | 1720 | |
d4d67150 RM |
1721 | #ifdef CONFIG_X86_32 |
1722 | # define IS_IA32 1 | |
1723 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1724 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1725 | #else |
1726 | # define IS_IA32 0 | |
1727 | #endif | |
1728 | ||
1729 | /* | |
1730 | * We must return the syscall number to actually look up in the table. | |
1731 | * This can be -1L to skip running any syscall at all. | |
1732 | */ | |
1733 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1734 | { |
d4d67150 RM |
1735 | long ret = 0; |
1736 | ||
380fdd75 RM |
1737 | /* |
1738 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1739 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1740 | * If user-mode had set TF itself, then it's still clear from | |
1741 | * do_debug() and we need to set it again to restore the user | |
1742 | * state. If we entered on the slow path, TF was already set. | |
1743 | */ | |
1744 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1745 | regs->flags |= X86_EFLAGS_TF; | |
1746 | ||
86976cd8 RM |
1747 | /* do the secure computing check first */ |
1748 | secure_computing(regs->orig_ax); | |
1749 | ||
d4d67150 RM |
1750 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1751 | ret = -1L; | |
1752 | ||
eeea3c3f RM |
1753 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1754 | tracehook_report_syscall_entry(regs)) | |
1755 | ret = -1L; | |
86976cd8 | 1756 | |
66700001 | 1757 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1758 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1759 | |
86976cd8 | 1760 | if (unlikely(current->audit_context)) { |
d4d67150 | 1761 | if (IS_IA32) |
86976cd8 RM |
1762 | audit_syscall_entry(AUDIT_ARCH_I386, |
1763 | regs->orig_ax, | |
1764 | regs->bx, regs->cx, | |
1765 | regs->dx, regs->si); | |
d4d67150 RM |
1766 | #ifdef CONFIG_X86_64 |
1767 | else | |
86976cd8 RM |
1768 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1769 | regs->orig_ax, | |
1770 | regs->di, regs->si, | |
1771 | regs->dx, regs->r10); | |
d4d67150 | 1772 | #endif |
86976cd8 | 1773 | } |
d4d67150 RM |
1774 | |
1775 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1776 | } |
1777 | ||
d4d67150 | 1778 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1779 | { |
d5196503 ON |
1780 | bool step; |
1781 | ||
86976cd8 RM |
1782 | if (unlikely(current->audit_context)) |
1783 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1784 | ||
66700001 | 1785 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1786 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1787 | |
d4d67150 RM |
1788 | /* |
1789 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1790 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1791 | * We already reported this syscall instruction in | |
d5196503 | 1792 | * syscall_trace_enter(). |
d4d67150 | 1793 | */ |
d5196503 ON |
1794 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1795 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1796 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1797 | tracehook_report_syscall_exit(regs, step); | |
d4d67150 | 1798 | } |