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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, |
070459d9 | 51 | REGSET_TLS, |
325af5fb | 52 | REGSET_IOPERM32, |
070459d9 | 53 | }; |
eee3af4a | 54 | |
b1cf540f MH |
55 | struct pt_regs_offset { |
56 | const char *name; | |
57 | int offset; | |
58 | }; | |
59 | ||
60 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
61 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
62 | ||
63 | static const struct pt_regs_offset regoffset_table[] = { | |
64 | #ifdef CONFIG_X86_64 | |
65 | REG_OFFSET_NAME(r15), | |
66 | REG_OFFSET_NAME(r14), | |
67 | REG_OFFSET_NAME(r13), | |
68 | REG_OFFSET_NAME(r12), | |
69 | REG_OFFSET_NAME(r11), | |
70 | REG_OFFSET_NAME(r10), | |
71 | REG_OFFSET_NAME(r9), | |
72 | REG_OFFSET_NAME(r8), | |
73 | #endif | |
74 | REG_OFFSET_NAME(bx), | |
75 | REG_OFFSET_NAME(cx), | |
76 | REG_OFFSET_NAME(dx), | |
77 | REG_OFFSET_NAME(si), | |
78 | REG_OFFSET_NAME(di), | |
79 | REG_OFFSET_NAME(bp), | |
80 | REG_OFFSET_NAME(ax), | |
81 | #ifdef CONFIG_X86_32 | |
82 | REG_OFFSET_NAME(ds), | |
83 | REG_OFFSET_NAME(es), | |
84 | REG_OFFSET_NAME(fs), | |
85 | REG_OFFSET_NAME(gs), | |
86 | #endif | |
87 | REG_OFFSET_NAME(orig_ax), | |
88 | REG_OFFSET_NAME(ip), | |
89 | REG_OFFSET_NAME(cs), | |
90 | REG_OFFSET_NAME(flags), | |
91 | REG_OFFSET_NAME(sp), | |
92 | REG_OFFSET_NAME(ss), | |
93 | REG_OFFSET_END, | |
94 | }; | |
95 | ||
96 | /** | |
97 | * regs_query_register_offset() - query register offset from its name | |
98 | * @name: the name of a register | |
99 | * | |
100 | * regs_query_register_offset() returns the offset of a register in struct | |
101 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
102 | */ | |
103 | int regs_query_register_offset(const char *name) | |
104 | { | |
105 | const struct pt_regs_offset *roff; | |
106 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
107 | if (!strcmp(roff->name, name)) | |
108 | return roff->offset; | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | /** | |
113 | * regs_query_register_name() - query register name from its offset | |
114 | * @offset: the offset of a register in struct pt_regs. | |
115 | * | |
116 | * regs_query_register_name() returns the name of a register from its | |
117 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
118 | */ | |
119 | const char *regs_query_register_name(unsigned int offset) | |
120 | { | |
121 | const struct pt_regs_offset *roff; | |
122 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
123 | if (roff->offset == offset) | |
124 | return roff->name; | |
125 | return NULL; | |
126 | } | |
127 | ||
128 | static const int arg_offs_table[] = { | |
129 | #ifdef CONFIG_X86_32 | |
130 | [0] = offsetof(struct pt_regs, ax), | |
131 | [1] = offsetof(struct pt_regs, dx), | |
132 | [2] = offsetof(struct pt_regs, cx) | |
133 | #else /* CONFIG_X86_64 */ | |
134 | [0] = offsetof(struct pt_regs, di), | |
135 | [1] = offsetof(struct pt_regs, si), | |
136 | [2] = offsetof(struct pt_regs, dx), | |
137 | [3] = offsetof(struct pt_regs, cx), | |
138 | [4] = offsetof(struct pt_regs, r8), | |
139 | [5] = offsetof(struct pt_regs, r9) | |
140 | #endif | |
141 | }; | |
142 | ||
143 | /** | |
144 | * regs_get_argument_nth() - get Nth argument at function call | |
145 | * @regs: pt_regs which contains registers at function entry. | |
146 | * @n: argument number. | |
147 | * | |
148 | * regs_get_argument_nth() returns @n th argument of a function call. | |
149 | * Since usually the kernel stack will be changed right after function entry, | |
150 | * you must use this at function entry. If the @n th entry is NOT in the | |
151 | * kernel stack or pt_regs, this returns 0. | |
152 | */ | |
153 | unsigned long regs_get_argument_nth(struct pt_regs *regs, unsigned int n) | |
154 | { | |
155 | if (n < ARRAY_SIZE(arg_offs_table)) | |
ad5cafcd | 156 | return *(unsigned long *)((char *)regs + arg_offs_table[n]); |
b1cf540f MH |
157 | else { |
158 | /* | |
159 | * The typical case: arg n is on the stack. | |
160 | * (Note: stack[0] = return address, so skip it) | |
161 | */ | |
162 | n -= ARRAY_SIZE(arg_offs_table); | |
163 | return regs_get_kernel_stack_nth(regs, 1 + n); | |
164 | } | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /* |
168 | * does not yet catch signals sent when the child dies. | |
169 | * in exit.c or in signal.c. | |
170 | */ | |
171 | ||
9f155b98 CE |
172 | /* |
173 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 174 | */ |
e39c2891 RM |
175 | #define FLAG_MASK_32 ((unsigned long) \ |
176 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
177 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
178 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
179 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
180 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
181 | ||
2047b08b RM |
182 | /* |
183 | * Determines whether a value may be installed in a segment register. | |
184 | */ | |
185 | static inline bool invalid_selector(u16 value) | |
186 | { | |
187 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
188 | } | |
189 | ||
190 | #ifdef CONFIG_X86_32 | |
191 | ||
e39c2891 | 192 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 193 | |
4fe702c7 | 194 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 195 | { |
65ea5b03 | 196 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 197 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
198 | } |
199 | ||
06ee1b68 | 200 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 201 | { |
06ee1b68 RM |
202 | /* |
203 | * Returning the value truncates it to 16 bits. | |
204 | */ | |
205 | unsigned int retval; | |
206 | if (offset != offsetof(struct user_regs_struct, gs)) | |
207 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
208 | else { | |
06ee1b68 | 209 | if (task == current) |
d9a89a26 TH |
210 | retval = get_user_gs(task_pt_regs(task)); |
211 | else | |
212 | retval = task_user_gs(task); | |
06ee1b68 RM |
213 | } |
214 | return retval; | |
215 | } | |
216 | ||
217 | static int set_segment_reg(struct task_struct *task, | |
218 | unsigned long offset, u16 value) | |
219 | { | |
220 | /* | |
221 | * The value argument was already truncated to 16 bits. | |
222 | */ | |
2047b08b | 223 | if (invalid_selector(value)) |
06ee1b68 RM |
224 | return -EIO; |
225 | ||
c63855d0 RM |
226 | /* |
227 | * For %cs and %ss we cannot permit a null selector. | |
228 | * We can permit a bogus selector as long as it has USER_RPL. | |
229 | * Null selectors are fine for other segment registers, but | |
230 | * we will never get back to user mode with invalid %cs or %ss | |
231 | * and will take the trap in iret instead. Much code relies | |
232 | * on user_mode() to distinguish a user trap frame (which can | |
233 | * safely use invalid selectors) from a kernel trap frame. | |
234 | */ | |
235 | switch (offset) { | |
236 | case offsetof(struct user_regs_struct, cs): | |
237 | case offsetof(struct user_regs_struct, ss): | |
238 | if (unlikely(value == 0)) | |
239 | return -EIO; | |
240 | ||
241 | default: | |
06ee1b68 | 242 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
243 | break; |
244 | ||
245 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 246 | if (task == current) |
d9a89a26 TH |
247 | set_user_gs(task_pt_regs(task), value); |
248 | else | |
249 | task_user_gs(task) = value; | |
1da177e4 | 250 | } |
06ee1b68 | 251 | |
1da177e4 LT |
252 | return 0; |
253 | } | |
254 | ||
2047b08b RM |
255 | #else /* CONFIG_X86_64 */ |
256 | ||
257 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
258 | ||
259 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
260 | { | |
261 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
262 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
263 | } | |
264 | ||
265 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
266 | { | |
267 | /* | |
268 | * Returning the value truncates it to 16 bits. | |
269 | */ | |
270 | unsigned int seg; | |
271 | ||
272 | switch (offset) { | |
273 | case offsetof(struct user_regs_struct, fs): | |
274 | if (task == current) { | |
275 | /* Older gas can't assemble movq %?s,%r?? */ | |
276 | asm("movl %%fs,%0" : "=r" (seg)); | |
277 | return seg; | |
278 | } | |
279 | return task->thread.fsindex; | |
280 | case offsetof(struct user_regs_struct, gs): | |
281 | if (task == current) { | |
282 | asm("movl %%gs,%0" : "=r" (seg)); | |
283 | return seg; | |
284 | } | |
285 | return task->thread.gsindex; | |
286 | case offsetof(struct user_regs_struct, ds): | |
287 | if (task == current) { | |
288 | asm("movl %%ds,%0" : "=r" (seg)); | |
289 | return seg; | |
290 | } | |
291 | return task->thread.ds; | |
292 | case offsetof(struct user_regs_struct, es): | |
293 | if (task == current) { | |
294 | asm("movl %%es,%0" : "=r" (seg)); | |
295 | return seg; | |
296 | } | |
297 | return task->thread.es; | |
298 | ||
299 | case offsetof(struct user_regs_struct, cs): | |
300 | case offsetof(struct user_regs_struct, ss): | |
301 | break; | |
302 | } | |
303 | return *pt_regs_access(task_pt_regs(task), offset); | |
304 | } | |
305 | ||
306 | static int set_segment_reg(struct task_struct *task, | |
307 | unsigned long offset, u16 value) | |
308 | { | |
309 | /* | |
310 | * The value argument was already truncated to 16 bits. | |
311 | */ | |
312 | if (invalid_selector(value)) | |
313 | return -EIO; | |
314 | ||
315 | switch (offset) { | |
316 | case offsetof(struct user_regs_struct,fs): | |
317 | /* | |
318 | * If this is setting fs as for normal 64-bit use but | |
319 | * setting fs_base has implicitly changed it, leave it. | |
320 | */ | |
321 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
322 | task->thread.fs != 0) || | |
323 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
324 | task->thread.fs == 0)) | |
325 | break; | |
326 | task->thread.fsindex = value; | |
327 | if (task == current) | |
328 | loadsegment(fs, task->thread.fsindex); | |
329 | break; | |
330 | case offsetof(struct user_regs_struct,gs): | |
331 | /* | |
332 | * If this is setting gs as for normal 64-bit use but | |
333 | * setting gs_base has implicitly changed it, leave it. | |
334 | */ | |
335 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
336 | task->thread.gs != 0) || | |
337 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
338 | task->thread.gs == 0)) | |
339 | break; | |
340 | task->thread.gsindex = value; | |
341 | if (task == current) | |
342 | load_gs_index(task->thread.gsindex); | |
343 | break; | |
344 | case offsetof(struct user_regs_struct,ds): | |
345 | task->thread.ds = value; | |
346 | if (task == current) | |
347 | loadsegment(ds, task->thread.ds); | |
348 | break; | |
349 | case offsetof(struct user_regs_struct,es): | |
350 | task->thread.es = value; | |
351 | if (task == current) | |
352 | loadsegment(es, task->thread.es); | |
353 | break; | |
354 | ||
355 | /* | |
356 | * Can't actually change these in 64-bit mode. | |
357 | */ | |
358 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
359 | if (unlikely(value == 0)) |
360 | return -EIO; | |
2047b08b RM |
361 | #ifdef CONFIG_IA32_EMULATION |
362 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
363 | task_pt_regs(task)->cs = value; | |
2047b08b | 364 | #endif |
cb757c41 | 365 | break; |
2047b08b | 366 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
367 | if (unlikely(value == 0)) |
368 | return -EIO; | |
2047b08b RM |
369 | #ifdef CONFIG_IA32_EMULATION |
370 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
371 | task_pt_regs(task)->ss = value; | |
2047b08b | 372 | #endif |
cb757c41 | 373 | break; |
2047b08b RM |
374 | } |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
2047b08b RM |
379 | #endif /* CONFIG_X86_32 */ |
380 | ||
06ee1b68 | 381 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 382 | { |
06ee1b68 RM |
383 | unsigned long retval = task_pt_regs(task)->flags; |
384 | ||
385 | /* | |
386 | * If the debugger set TF, hide it from the readout. | |
387 | */ | |
388 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
389 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 390 | |
1da177e4 LT |
391 | return retval; |
392 | } | |
393 | ||
06ee1b68 RM |
394 | static int set_flags(struct task_struct *task, unsigned long value) |
395 | { | |
396 | struct pt_regs *regs = task_pt_regs(task); | |
397 | ||
398 | /* | |
399 | * If the user value contains TF, mark that | |
400 | * it was not "us" (the debugger) that set it. | |
401 | * If not, make sure it stays set if we had. | |
402 | */ | |
403 | if (value & X86_EFLAGS_TF) | |
404 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
405 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
406 | value |= X86_EFLAGS_TF; | |
407 | ||
408 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | static int putreg(struct task_struct *child, | |
414 | unsigned long offset, unsigned long value) | |
415 | { | |
416 | switch (offset) { | |
417 | case offsetof(struct user_regs_struct, cs): | |
418 | case offsetof(struct user_regs_struct, ds): | |
419 | case offsetof(struct user_regs_struct, es): | |
420 | case offsetof(struct user_regs_struct, fs): | |
421 | case offsetof(struct user_regs_struct, gs): | |
422 | case offsetof(struct user_regs_struct, ss): | |
423 | return set_segment_reg(child, offset, value); | |
424 | ||
425 | case offsetof(struct user_regs_struct, flags): | |
426 | return set_flags(child, value); | |
2047b08b RM |
427 | |
428 | #ifdef CONFIG_X86_64 | |
429 | case offsetof(struct user_regs_struct,fs_base): | |
430 | if (value >= TASK_SIZE_OF(child)) | |
431 | return -EIO; | |
432 | /* | |
433 | * When changing the segment base, use do_arch_prctl | |
434 | * to set either thread.fs or thread.fsindex and the | |
435 | * corresponding GDT slot. | |
436 | */ | |
437 | if (child->thread.fs != value) | |
438 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
439 | return 0; | |
440 | case offsetof(struct user_regs_struct,gs_base): | |
441 | /* | |
442 | * Exactly the same here as the %fs handling above. | |
443 | */ | |
444 | if (value >= TASK_SIZE_OF(child)) | |
445 | return -EIO; | |
446 | if (child->thread.gs != value) | |
447 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
448 | return 0; | |
449 | #endif | |
06ee1b68 RM |
450 | } |
451 | ||
452 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
457 | { | |
458 | switch (offset) { | |
459 | case offsetof(struct user_regs_struct, cs): | |
460 | case offsetof(struct user_regs_struct, ds): | |
461 | case offsetof(struct user_regs_struct, es): | |
462 | case offsetof(struct user_regs_struct, fs): | |
463 | case offsetof(struct user_regs_struct, gs): | |
464 | case offsetof(struct user_regs_struct, ss): | |
465 | return get_segment_reg(task, offset); | |
466 | ||
467 | case offsetof(struct user_regs_struct, flags): | |
468 | return get_flags(task); | |
2047b08b RM |
469 | |
470 | #ifdef CONFIG_X86_64 | |
471 | case offsetof(struct user_regs_struct, fs_base): { | |
472 | /* | |
473 | * do_arch_prctl may have used a GDT slot instead of | |
474 | * the MSR. To userland, it appears the same either | |
475 | * way, except the %fs segment selector might not be 0. | |
476 | */ | |
477 | unsigned int seg = task->thread.fsindex; | |
478 | if (task->thread.fs != 0) | |
479 | return task->thread.fs; | |
480 | if (task == current) | |
481 | asm("movl %%fs,%0" : "=r" (seg)); | |
482 | if (seg != FS_TLS_SEL) | |
483 | return 0; | |
484 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
485 | } | |
486 | case offsetof(struct user_regs_struct, gs_base): { | |
487 | /* | |
488 | * Exactly the same here as the %fs handling above. | |
489 | */ | |
490 | unsigned int seg = task->thread.gsindex; | |
491 | if (task->thread.gs != 0) | |
492 | return task->thread.gs; | |
493 | if (task == current) | |
494 | asm("movl %%gs,%0" : "=r" (seg)); | |
495 | if (seg != GS_TLS_SEL) | |
496 | return 0; | |
497 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
498 | } | |
499 | #endif | |
06ee1b68 RM |
500 | } |
501 | ||
502 | return *pt_regs_access(task_pt_regs(task), offset); | |
503 | } | |
504 | ||
91e7b707 RM |
505 | static int genregs_get(struct task_struct *target, |
506 | const struct user_regset *regset, | |
507 | unsigned int pos, unsigned int count, | |
508 | void *kbuf, void __user *ubuf) | |
509 | { | |
510 | if (kbuf) { | |
511 | unsigned long *k = kbuf; | |
04a1e62c | 512 | while (count >= sizeof(*k)) { |
91e7b707 RM |
513 | *k++ = getreg(target, pos); |
514 | count -= sizeof(*k); | |
515 | pos += sizeof(*k); | |
516 | } | |
517 | } else { | |
518 | unsigned long __user *u = ubuf; | |
04a1e62c | 519 | while (count >= sizeof(*u)) { |
91e7b707 RM |
520 | if (__put_user(getreg(target, pos), u++)) |
521 | return -EFAULT; | |
522 | count -= sizeof(*u); | |
523 | pos += sizeof(*u); | |
524 | } | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int genregs_set(struct task_struct *target, | |
531 | const struct user_regset *regset, | |
532 | unsigned int pos, unsigned int count, | |
533 | const void *kbuf, const void __user *ubuf) | |
534 | { | |
535 | int ret = 0; | |
536 | if (kbuf) { | |
537 | const unsigned long *k = kbuf; | |
04a1e62c | 538 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
539 | ret = putreg(target, pos, *k++); |
540 | count -= sizeof(*k); | |
541 | pos += sizeof(*k); | |
542 | } | |
543 | } else { | |
544 | const unsigned long __user *u = ubuf; | |
04a1e62c | 545 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
546 | unsigned long word; |
547 | ret = __get_user(word, u++); | |
548 | if (ret) | |
549 | break; | |
550 | ret = putreg(target, pos, word); | |
551 | count -= sizeof(*u); | |
552 | pos += sizeof(*u); | |
553 | } | |
554 | } | |
555 | return ret; | |
556 | } | |
557 | ||
b326e956 FW |
558 | static void ptrace_triggered(struct perf_event *bp, int nmi, |
559 | struct perf_sample_data *data, | |
560 | struct pt_regs *regs) | |
d9771e8c | 561 | { |
0f534093 | 562 | int i; |
24f1e32c | 563 | struct thread_struct *thread = &(current->thread); |
0f534093 | 564 | |
72f674d2 P |
565 | /* |
566 | * Store in the virtual DR6 register the fact that the breakpoint | |
567 | * was hit so the thread's debugger will see it. | |
568 | */ | |
24f1e32c FW |
569 | for (i = 0; i < HBP_NUM; i++) { |
570 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 571 | break; |
24f1e32c | 572 | } |
d9771e8c | 573 | |
72f674d2 P |
574 | thread->debugreg6 |= (DR_TRAP0 << i); |
575 | } | |
d9771e8c | 576 | |
d9771e8c | 577 | /* |
24f1e32c FW |
578 | * Walk through every ptrace breakpoints for this thread and |
579 | * build the dr7 value on top of their attributes. | |
580 | * | |
d9771e8c | 581 | */ |
24f1e32c | 582 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 583 | { |
24f1e32c FW |
584 | int i; |
585 | int dr7 = 0; | |
586 | struct arch_hw_breakpoint *info; | |
587 | ||
588 | for (i = 0; i < HBP_NUM; i++) { | |
589 | if (bp[i] && !bp[i]->attr.disabled) { | |
590 | info = counter_arch_bp(bp[i]); | |
591 | dr7 |= encode_dr7(i, info->len, info->type); | |
592 | } | |
0f534093 | 593 | } |
24f1e32c FW |
594 | |
595 | return dr7; | |
d9771e8c RM |
596 | } |
597 | ||
44234adc | 598 | static int |
5fa10b28 | 599 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
1cedae72 | 600 | struct task_struct *tsk, int disabled) |
5fa10b28 FW |
601 | { |
602 | int err; | |
603 | int gen_len, gen_type; | |
b326e956 | 604 | struct perf_event_attr attr; |
5fa10b28 FW |
605 | |
606 | /* | |
607 | * We shoud have at least an inactive breakpoint at this | |
608 | * slot. It means the user is writing dr7 without having | |
609 | * written the address register first | |
610 | */ | |
611 | if (!bp) | |
44234adc | 612 | return -EINVAL; |
5fa10b28 FW |
613 | |
614 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); | |
615 | if (err) | |
44234adc | 616 | return err; |
5fa10b28 FW |
617 | |
618 | attr = bp->attr; | |
619 | attr.bp_len = gen_len; | |
620 | attr.bp_type = gen_type; | |
1cedae72 | 621 | attr.disabled = disabled; |
5fa10b28 | 622 | |
2f0993e0 | 623 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
624 | } |
625 | ||
72f674d2 P |
626 | /* |
627 | * Handle ptrace writes to debug register 7. | |
628 | */ | |
629 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 630 | { |
72f674d2 | 631 | struct thread_struct *thread = &(tsk->thread); |
24f1e32c | 632 | unsigned long old_dr7; |
72f674d2 P |
633 | int i, orig_ret = 0, rc = 0; |
634 | int enabled, second_pass = 0; | |
635 | unsigned len, type; | |
24f1e32c | 636 | struct perf_event *bp; |
72f674d2 P |
637 | |
638 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 639 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
72f674d2 P |
640 | restore: |
641 | /* | |
642 | * Loop through all the hardware breakpoints, making the | |
643 | * appropriate changes to each. | |
644 | */ | |
645 | for (i = 0; i < HBP_NUM; i++) { | |
646 | enabled = decode_dr7(data, i, &len, &type); | |
24f1e32c | 647 | bp = thread->ptrace_bps[i]; |
72f674d2 P |
648 | |
649 | if (!enabled) { | |
650 | if (bp) { | |
24f1e32c FW |
651 | /* |
652 | * Don't unregister the breakpoints right-away, | |
72f674d2 P |
653 | * unless all register_user_hw_breakpoint() |
654 | * requests have succeeded. This prevents | |
655 | * any window of opportunity for debug | |
656 | * register grabbing by other users. | |
657 | */ | |
658 | if (!second_pass) | |
659 | continue; | |
1cedae72 | 660 | |
44234adc | 661 | rc = ptrace_modify_breakpoint(bp, len, type, |
1cedae72 | 662 | tsk, 1); |
44234adc | 663 | if (rc) |
1cedae72 | 664 | break; |
72f674d2 P |
665 | } |
666 | continue; | |
667 | } | |
0f534093 | 668 | |
44234adc FW |
669 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
670 | if (rc) | |
24f1e32c | 671 | break; |
72f674d2 P |
672 | } |
673 | /* | |
674 | * Make a second pass to free the remaining unused breakpoints | |
675 | * or to restore the original breakpoints if an error occurred. | |
676 | */ | |
677 | if (!second_pass) { | |
678 | second_pass = 1; | |
679 | if (rc < 0) { | |
680 | orig_ret = rc; | |
681 | data = old_dr7; | |
682 | } | |
683 | goto restore; | |
684 | } | |
685 | return ((orig_ret < 0) ? orig_ret : rc); | |
686 | } | |
0f534093 | 687 | |
72f674d2 P |
688 | /* |
689 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
690 | */ | |
9d22b536 | 691 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 P |
692 | { |
693 | struct thread_struct *thread = &(tsk->thread); | |
694 | unsigned long val = 0; | |
695 | ||
24f1e32c FW |
696 | if (n < HBP_NUM) { |
697 | struct perf_event *bp; | |
698 | bp = thread->ptrace_bps[n]; | |
699 | if (!bp) | |
700 | return 0; | |
701 | val = bp->hw.info.address; | |
702 | } else if (n == 6) { | |
72f674d2 | 703 | val = thread->debugreg6; |
24f1e32c FW |
704 | } else if (n == 7) { |
705 | val = ptrace_get_dr7(thread->ptrace_bps); | |
706 | } | |
72f674d2 P |
707 | return val; |
708 | } | |
0f534093 | 709 | |
24f1e32c FW |
710 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
711 | unsigned long addr) | |
712 | { | |
713 | struct perf_event *bp; | |
714 | struct thread_struct *t = &tsk->thread; | |
b326e956 | 715 | struct perf_event_attr attr; |
24f1e32c FW |
716 | |
717 | if (!t->ptrace_bps[nr]) { | |
b326e956 | 718 | hw_breakpoint_init(&attr); |
d9771e8c | 719 | /* |
24f1e32c FW |
720 | * Put stub len and type to register (reserve) an inactive but |
721 | * correct bp | |
d9771e8c | 722 | */ |
5fa10b28 FW |
723 | attr.bp_addr = addr; |
724 | attr.bp_len = HW_BREAKPOINT_LEN_1; | |
725 | attr.bp_type = HW_BREAKPOINT_W; | |
726 | attr.disabled = 1; | |
727 | ||
728 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk); | |
44234adc FW |
729 | |
730 | /* | |
731 | * CHECKME: the previous code returned -EIO if the addr wasn't | |
732 | * a valid task virtual addr. The new one will return -EINVAL in | |
733 | * this case. | |
734 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
735 | * but -EIO looks better for ptrace, since we refuse a register | |
736 | * writing for the user. And anyway this is the previous | |
737 | * behaviour. | |
738 | */ | |
739 | if (IS_ERR(bp)) | |
740 | return PTR_ERR(bp); | |
741 | ||
742 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 743 | } else { |
44234adc FW |
744 | int err; |
745 | ||
24f1e32c | 746 | bp = t->ptrace_bps[nr]; |
5fa10b28 FW |
747 | |
748 | attr = bp->attr; | |
749 | attr.bp_addr = addr; | |
44234adc FW |
750 | err = modify_user_hw_breakpoint(bp, &attr); |
751 | if (err) | |
752 | return err; | |
d9771e8c | 753 | } |
24f1e32c | 754 | |
24f1e32c | 755 | |
d9771e8c RM |
756 | return 0; |
757 | } | |
758 | ||
72f674d2 P |
759 | /* |
760 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
761 | */ | |
762 | int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val) | |
763 | { | |
764 | struct thread_struct *thread = &(tsk->thread); | |
765 | int rc = 0; | |
766 | ||
767 | /* There are no DR4 or DR5 registers */ | |
768 | if (n == 4 || n == 5) | |
769 | return -EIO; | |
770 | ||
771 | if (n == 6) { | |
24f1e32c | 772 | thread->debugreg6 = val; |
72f674d2 | 773 | goto ret_path; |
d9771e8c | 774 | } |
72f674d2 | 775 | if (n < HBP_NUM) { |
24f1e32c FW |
776 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
777 | if (rc) | |
778 | return rc; | |
72f674d2 P |
779 | } |
780 | /* All that's left is DR7 */ | |
781 | if (n == 7) | |
782 | rc = ptrace_write_dr7(tsk, val); | |
d9771e8c | 783 | |
72f674d2 P |
784 | ret_path: |
785 | return rc; | |
d9771e8c RM |
786 | } |
787 | ||
325af5fb RM |
788 | /* |
789 | * These access the current or another (stopped) task's io permission | |
790 | * bitmap for debugging or core dump. | |
791 | */ | |
792 | static int ioperm_active(struct task_struct *target, | |
793 | const struct user_regset *regset) | |
794 | { | |
795 | return target->thread.io_bitmap_max / regset->size; | |
796 | } | |
b4ef95de | 797 | |
325af5fb RM |
798 | static int ioperm_get(struct task_struct *target, |
799 | const struct user_regset *regset, | |
800 | unsigned int pos, unsigned int count, | |
801 | void *kbuf, void __user *ubuf) | |
eee3af4a | 802 | { |
325af5fb | 803 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
804 | return -ENXIO; |
805 | ||
325af5fb RM |
806 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
807 | target->thread.io_bitmap_ptr, | |
808 | 0, IO_BITMAP_BYTES); | |
809 | } | |
810 | ||
93fa7636 | 811 | #ifdef CONFIG_X86_PTRACE_BTS |
e2b371f0 MM |
812 | /* |
813 | * A branch trace store context. | |
814 | * | |
815 | * Contexts may only be installed by ptrace_bts_config() and only for | |
816 | * ptraced tasks. | |
817 | * | |
818 | * Contexts are destroyed when the tracee is detached from the tracer. | |
819 | * The actual destruction work requires interrupts enabled, so the | |
820 | * work is deferred and will be scheduled during __ptrace_unlink(). | |
821 | * | |
822 | * Contexts hold an additional task_struct reference on the traced | |
823 | * task, as well as a reference on the tracer's mm. | |
824 | * | |
825 | * Ptrace already holds a task_struct for the duration of ptrace operations, | |
826 | * but since destruction is deferred, it may be executed after both | |
827 | * tracer and tracee exited. | |
828 | */ | |
829 | struct bts_context { | |
830 | /* The branch trace handle. */ | |
831 | struct bts_tracer *tracer; | |
832 | ||
833 | /* The buffer used to store the branch trace and its size. */ | |
834 | void *buffer; | |
835 | unsigned int size; | |
836 | ||
837 | /* The mm that paid for the above buffer. */ | |
838 | struct mm_struct *mm; | |
839 | ||
840 | /* The task this context belongs to. */ | |
841 | struct task_struct *task; | |
842 | ||
843 | /* The signal to send on a bts buffer overflow. */ | |
844 | unsigned int bts_ovfl_signal; | |
845 | ||
846 | /* The work struct to destroy a context. */ | |
847 | struct work_struct work; | |
848 | }; | |
849 | ||
1cb81b14 | 850 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
e2b371f0 | 851 | { |
1cb81b14 MM |
852 | void *buffer = NULL; |
853 | int err = -ENOMEM; | |
e2b371f0 | 854 | |
1cb81b14 MM |
855 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
856 | if (err < 0) | |
857 | return err; | |
858 | ||
859 | buffer = kzalloc(size, GFP_KERNEL); | |
860 | if (!buffer) | |
861 | goto out_refund; | |
862 | ||
863 | context->buffer = buffer; | |
864 | context->size = size; | |
865 | context->mm = get_task_mm(current); | |
866 | ||
867 | return 0; | |
868 | ||
869 | out_refund: | |
870 | refund_locked_memory(current->mm, size); | |
871 | return err; | |
e2b371f0 MM |
872 | } |
873 | ||
874 | static inline void free_bts_buffer(struct bts_context *context) | |
875 | { | |
876 | if (!context->buffer) | |
877 | return; | |
878 | ||
879 | kfree(context->buffer); | |
880 | context->buffer = NULL; | |
881 | ||
1cb81b14 | 882 | refund_locked_memory(context->mm, context->size); |
e2b371f0 MM |
883 | context->size = 0; |
884 | ||
885 | mmput(context->mm); | |
886 | context->mm = NULL; | |
887 | } | |
888 | ||
889 | static void free_bts_context_work(struct work_struct *w) | |
890 | { | |
891 | struct bts_context *context; | |
892 | ||
893 | context = container_of(w, struct bts_context, work); | |
894 | ||
895 | ds_release_bts(context->tracer); | |
896 | put_task_struct(context->task); | |
897 | free_bts_buffer(context); | |
898 | kfree(context); | |
899 | } | |
900 | ||
901 | static inline void free_bts_context(struct bts_context *context) | |
902 | { | |
903 | INIT_WORK(&context->work, free_bts_context_work); | |
904 | schedule_work(&context->work); | |
905 | } | |
906 | ||
907 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) | |
908 | { | |
909 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); | |
910 | if (context) { | |
911 | context->task = task; | |
912 | task->bts = context; | |
913 | ||
914 | get_task_struct(task); | |
915 | } | |
916 | ||
917 | return context; | |
918 | } | |
919 | ||
93fa7636 | 920 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
921 | struct bts_struct __user *out) |
922 | { | |
e2b371f0 | 923 | struct bts_context *context; |
c2724775 MM |
924 | const struct bts_trace *trace; |
925 | struct bts_struct bts; | |
926 | const unsigned char *at; | |
93fa7636 | 927 | int error; |
eee3af4a | 928 | |
e2b371f0 MM |
929 | context = child->bts; |
930 | if (!context) | |
931 | return -ESRCH; | |
932 | ||
933 | trace = ds_read_bts(context->tracer); | |
c2724775 | 934 | if (!trace) |
e2b371f0 | 935 | return -ESRCH; |
e4811f25 | 936 | |
c2724775 MM |
937 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
938 | if ((void *)at < trace->ds.begin) | |
939 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 940 | |
c2724775 MM |
941 | if (!trace->read) |
942 | return -EOPNOTSUPP; | |
93fa7636 | 943 | |
e2b371f0 | 944 | error = trace->read(context->tracer, at, &bts); |
93fa7636 MM |
945 | if (error < 0) |
946 | return error; | |
e4811f25 | 947 | |
c2724775 | 948 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
949 | return -EFAULT; |
950 | ||
c2724775 | 951 | return sizeof(bts); |
eee3af4a MM |
952 | } |
953 | ||
a95d67f8 | 954 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 955 | long size, |
a95d67f8 MM |
956 | struct bts_struct __user *out) |
957 | { | |
e2b371f0 | 958 | struct bts_context *context; |
c2724775 MM |
959 | const struct bts_trace *trace; |
960 | const unsigned char *at; | |
961 | int error, drained = 0; | |
eee3af4a | 962 | |
e2b371f0 MM |
963 | context = child->bts; |
964 | if (!context) | |
965 | return -ESRCH; | |
966 | ||
967 | trace = ds_read_bts(context->tracer); | |
c2724775 | 968 | if (!trace) |
e2b371f0 | 969 | return -ESRCH; |
a95d67f8 | 970 | |
c2724775 MM |
971 | if (!trace->read) |
972 | return -EOPNOTSUPP; | |
973 | ||
974 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
975 | return -EIO; |
976 | ||
c2724775 MM |
977 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
978 | out++, drained++, at += trace->ds.size) { | |
979 | struct bts_struct bts; | |
a95d67f8 | 980 | |
e2b371f0 | 981 | error = trace->read(context->tracer, at, &bts); |
c2724775 MM |
982 | if (error < 0) |
983 | return error; | |
a95d67f8 | 984 | |
c2724775 | 985 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
986 | return -EFAULT; |
987 | } | |
988 | ||
c2724775 MM |
989 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
990 | ||
e2b371f0 | 991 | error = ds_reset_bts(context->tracer); |
93fa7636 MM |
992 | if (error < 0) |
993 | return error; | |
a95d67f8 | 994 | |
c2724775 | 995 | return drained; |
a95d67f8 MM |
996 | } |
997 | ||
998 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 999 | long cfg_size, |
a95d67f8 MM |
1000 | const struct ptrace_bts_config __user *ucfg) |
1001 | { | |
e2b371f0 | 1002 | struct bts_context *context; |
a95d67f8 | 1003 | struct ptrace_bts_config cfg; |
c2724775 | 1004 | unsigned int flags = 0; |
a95d67f8 | 1005 | |
cba4b65d | 1006 | if (cfg_size < sizeof(cfg)) |
c2724775 | 1007 | return -EIO; |
cba4b65d | 1008 | |
a95d67f8 | 1009 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 1010 | return -EFAULT; |
6abb11ae | 1011 | |
e2b371f0 MM |
1012 | context = child->bts; |
1013 | if (!context) | |
1014 | context = alloc_bts_context(child); | |
1015 | if (!context) | |
1016 | return -ENOMEM; | |
93fa7636 | 1017 | |
c2724775 MM |
1018 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
1019 | if (!cfg.signal) | |
1020 | return -EINVAL; | |
ca0002a1 | 1021 | |
5a8ac9d2 | 1022 | return -EOPNOTSUPP; |
e2b371f0 | 1023 | context->bts_ovfl_signal = cfg.signal; |
c2724775 | 1024 | } |
6abb11ae | 1025 | |
e2b371f0 MM |
1026 | ds_release_bts(context->tracer); |
1027 | context->tracer = NULL; | |
6abb11ae | 1028 | |
e2b371f0 | 1029 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
1cb81b14 MM |
1030 | int err; |
1031 | ||
e2b371f0 MM |
1032 | free_bts_buffer(context); |
1033 | if (!cfg.size) | |
1034 | return 0; | |
c5dee617 | 1035 | |
1cb81b14 MM |
1036 | err = alloc_bts_buffer(context, cfg.size); |
1037 | if (err < 0) | |
1038 | return err; | |
a95d67f8 MM |
1039 | } |
1040 | ||
da35c371 | 1041 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 1042 | flags |= BTS_USER; |
eee3af4a | 1043 | |
da35c371 | 1044 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 1045 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 1046 | |
de79f54f MM |
1047 | context->tracer = |
1048 | ds_request_bts_task(child, context->buffer, context->size, | |
1049 | NULL, (size_t)-1, flags); | |
e2b371f0 MM |
1050 | if (unlikely(IS_ERR(context->tracer))) { |
1051 | int error = PTR_ERR(context->tracer); | |
da35c371 | 1052 | |
e2b371f0 MM |
1053 | free_bts_buffer(context); |
1054 | context->tracer = NULL; | |
c2724775 MM |
1055 | return error; |
1056 | } | |
da35c371 | 1057 | |
c2724775 | 1058 | return sizeof(cfg); |
eee3af4a MM |
1059 | } |
1060 | ||
a95d67f8 | 1061 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 1062 | long cfg_size, |
a95d67f8 | 1063 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 1064 | { |
e2b371f0 | 1065 | struct bts_context *context; |
c2724775 | 1066 | const struct bts_trace *trace; |
a95d67f8 | 1067 | struct ptrace_bts_config cfg; |
eee3af4a | 1068 | |
e2b371f0 MM |
1069 | context = child->bts; |
1070 | if (!context) | |
1071 | return -ESRCH; | |
1072 | ||
cba4b65d MM |
1073 | if (cfg_size < sizeof(cfg)) |
1074 | return -EIO; | |
1075 | ||
e2b371f0 | 1076 | trace = ds_read_bts(context->tracer); |
c2724775 | 1077 | if (!trace) |
e2b371f0 | 1078 | return -ESRCH; |
eee3af4a | 1079 | |
93fa7636 | 1080 | memset(&cfg, 0, sizeof(cfg)); |
e2b371f0 MM |
1081 | cfg.size = trace->ds.end - trace->ds.begin; |
1082 | cfg.signal = context->bts_ovfl_signal; | |
1083 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 1084 | |
93fa7636 MM |
1085 | if (cfg.signal) |
1086 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 1087 | |
c2724775 | 1088 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
1089 | cfg.flags |= PTRACE_BTS_O_TRACE; |
1090 | ||
c2724775 | 1091 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 1092 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 1093 | |
a95d67f8 MM |
1094 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
1095 | return -EFAULT; | |
eee3af4a | 1096 | |
a95d67f8 | 1097 | return sizeof(cfg); |
eee3af4a MM |
1098 | } |
1099 | ||
c2724775 | 1100 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 1101 | { |
e2b371f0 | 1102 | struct bts_context *context; |
c2724775 | 1103 | const struct bts_trace *trace; |
d8d4f157 | 1104 | |
e2b371f0 MM |
1105 | context = child->bts; |
1106 | if (!context) | |
1107 | return -ESRCH; | |
1108 | ||
1109 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1110 | if (!trace) |
e2b371f0 | 1111 | return -ESRCH; |
d8d4f157 | 1112 | |
c2724775 | 1113 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 1114 | |
e2b371f0 | 1115 | return ds_reset_bts(context->tracer); |
d8d4f157 AM |
1116 | } |
1117 | ||
c2724775 | 1118 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 1119 | { |
e2b371f0 | 1120 | struct bts_context *context; |
c2724775 | 1121 | const struct bts_trace *trace; |
93fa7636 | 1122 | |
e2b371f0 MM |
1123 | context = child->bts; |
1124 | if (!context) | |
1125 | return -ESRCH; | |
1126 | ||
1127 | trace = ds_read_bts(context->tracer); | |
c2724775 | 1128 | if (!trace) |
e2b371f0 | 1129 | return -ESRCH; |
93fa7636 | 1130 | |
c2724775 | 1131 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 1132 | } |
bf53de90 | 1133 | |
e2b371f0 MM |
1134 | /* |
1135 | * Called from __ptrace_unlink() after the child has been moved back | |
1136 | * to its original parent. | |
1137 | */ | |
0f481406 | 1138 | void ptrace_bts_untrace(struct task_struct *child) |
bf53de90 MM |
1139 | { |
1140 | if (unlikely(child->bts)) { | |
e2b371f0 | 1141 | free_bts_context(child->bts); |
bf53de90 | 1142 | child->bts = NULL; |
bf53de90 MM |
1143 | } |
1144 | } | |
93fa7636 | 1145 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1146 | |
1da177e4 LT |
1147 | /* |
1148 | * Called by kernel/ptrace.c when detaching.. | |
1149 | * | |
1150 | * Make sure the single step bit is not set. | |
1151 | */ | |
1152 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 1153 | { |
7f232343 | 1154 | user_disable_single_step(child); |
e9c86c78 | 1155 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 1156 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 1157 | #endif |
1da177e4 LT |
1158 | } |
1159 | ||
5a4646a4 RM |
1160 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1161 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
1162 | #endif | |
1163 | ||
481bed45 | 1164 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 1165 | { |
5a4646a4 | 1166 | int ret; |
1da177e4 LT |
1167 | unsigned long __user *datap = (unsigned long __user *)data; |
1168 | ||
1da177e4 | 1169 | switch (request) { |
1da177e4 LT |
1170 | /* read the word at location addr in the USER area. */ |
1171 | case PTRACE_PEEKUSR: { | |
1172 | unsigned long tmp; | |
1173 | ||
1174 | ret = -EIO; | |
e9c86c78 RM |
1175 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1176 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1177 | break; |
1178 | ||
1179 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 1180 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1181 | tmp = getreg(child, addr); |
e9c86c78 RM |
1182 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1183 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1184 | addr -= offsetof(struct user, u_debugreg[0]); | |
1185 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
1186 | } |
1187 | ret = put_user(tmp, datap); | |
1188 | break; | |
1189 | } | |
1190 | ||
1da177e4 LT |
1191 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
1192 | ret = -EIO; | |
e9c86c78 RM |
1193 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
1194 | addr >= sizeof(struct user)) | |
1da177e4 LT |
1195 | break; |
1196 | ||
e9c86c78 | 1197 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 1198 | ret = putreg(child, addr, data); |
e9c86c78 RM |
1199 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
1200 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1201 | addr -= offsetof(struct user, u_debugreg[0]); | |
1202 | ret = ptrace_set_debugreg(child, | |
1203 | addr / sizeof(data), data); | |
1da177e4 | 1204 | } |
e9c86c78 | 1205 | break; |
1da177e4 | 1206 | |
5a4646a4 RM |
1207 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1208 | return copy_regset_to_user(child, | |
1209 | task_user_regset_view(current), | |
1210 | REGSET_GENERAL, | |
1211 | 0, sizeof(struct user_regs_struct), | |
1212 | datap); | |
1213 | ||
1214 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1215 | return copy_regset_from_user(child, | |
1216 | task_user_regset_view(current), | |
1217 | REGSET_GENERAL, | |
1218 | 0, sizeof(struct user_regs_struct), | |
1219 | datap); | |
1220 | ||
1221 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1222 | return copy_regset_to_user(child, | |
1223 | task_user_regset_view(current), | |
1224 | REGSET_FP, | |
1225 | 0, sizeof(struct user_i387_struct), | |
1226 | datap); | |
1227 | ||
1228 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1229 | return copy_regset_from_user(child, | |
1230 | task_user_regset_view(current), | |
1231 | REGSET_FP, | |
1232 | 0, sizeof(struct user_i387_struct), | |
1233 | datap); | |
1da177e4 | 1234 | |
e9c86c78 | 1235 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
1236 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
1237 | return copy_regset_to_user(child, &user_x86_32_view, | |
1238 | REGSET_XFP, | |
1239 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1240 | datap) ? -EIO : 0; |
5a4646a4 RM |
1241 | |
1242 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1243 | return copy_regset_from_user(child, &user_x86_32_view, | |
1244 | REGSET_XFP, | |
1245 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1246 | datap) ? -EIO : 0; |
e9c86c78 | 1247 | #endif |
1da177e4 | 1248 | |
e9c86c78 | 1249 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 1250 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
1251 | if (addr < 0) |
1252 | return -EIO; | |
1253 | ret = do_get_thread_area(child, addr, | |
1254 | (struct user_desc __user *) data); | |
1da177e4 LT |
1255 | break; |
1256 | ||
1257 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
1258 | if (addr < 0) |
1259 | return -EIO; | |
1260 | ret = do_set_thread_area(child, addr, | |
1261 | (struct user_desc __user *) data, 0); | |
1da177e4 | 1262 | break; |
e9c86c78 RM |
1263 | #endif |
1264 | ||
1265 | #ifdef CONFIG_X86_64 | |
1266 | /* normal 64bit interface to access TLS data. | |
1267 | Works just like arch_prctl, except that the arguments | |
1268 | are reversed. */ | |
1269 | case PTRACE_ARCH_PRCTL: | |
1270 | ret = do_arch_prctl(child, data, addr); | |
1271 | break; | |
1272 | #endif | |
1da177e4 | 1273 | |
b4ef95de IM |
1274 | /* |
1275 | * These bits need more cooking - not enabled yet: | |
1276 | */ | |
93fa7636 | 1277 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
1278 | case PTRACE_BTS_CONFIG: |
1279 | ret = ptrace_bts_config | |
cba4b65d | 1280 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1281 | break; |
1282 | ||
a95d67f8 MM |
1283 | case PTRACE_BTS_STATUS: |
1284 | ret = ptrace_bts_status | |
cba4b65d | 1285 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1286 | break; |
1287 | ||
c2724775 MM |
1288 | case PTRACE_BTS_SIZE: |
1289 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
1290 | break; |
1291 | ||
a95d67f8 | 1292 | case PTRACE_BTS_GET: |
eee3af4a | 1293 | ret = ptrace_bts_read_record |
a95d67f8 | 1294 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1295 | break; |
1296 | ||
a95d67f8 | 1297 | case PTRACE_BTS_CLEAR: |
c2724775 | 1298 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
1299 | break; |
1300 | ||
a95d67f8 MM |
1301 | case PTRACE_BTS_DRAIN: |
1302 | ret = ptrace_bts_drain | |
cba4b65d | 1303 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1304 | break; |
93fa7636 | 1305 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1306 | |
1da177e4 LT |
1307 | default: |
1308 | ret = ptrace_request(child, request, addr, data); | |
1309 | break; | |
1310 | } | |
d9771e8c | 1311 | |
1da177e4 LT |
1312 | return ret; |
1313 | } | |
1314 | ||
cb757c41 RM |
1315 | #ifdef CONFIG_IA32_EMULATION |
1316 | ||
099cd6e9 RM |
1317 | #include <linux/compat.h> |
1318 | #include <linux/syscalls.h> | |
1319 | #include <asm/ia32.h> | |
cb757c41 RM |
1320 | #include <asm/user32.h> |
1321 | ||
1322 | #define R32(l,q) \ | |
1323 | case offsetof(struct user32, regs.l): \ | |
1324 | regs->q = value; break | |
1325 | ||
1326 | #define SEG32(rs) \ | |
1327 | case offsetof(struct user32, regs.rs): \ | |
1328 | return set_segment_reg(child, \ | |
1329 | offsetof(struct user_regs_struct, rs), \ | |
1330 | value); \ | |
1331 | break | |
1332 | ||
1333 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1334 | { | |
1335 | struct pt_regs *regs = task_pt_regs(child); | |
1336 | ||
1337 | switch (regno) { | |
1338 | ||
1339 | SEG32(cs); | |
1340 | SEG32(ds); | |
1341 | SEG32(es); | |
1342 | SEG32(fs); | |
1343 | SEG32(gs); | |
1344 | SEG32(ss); | |
1345 | ||
1346 | R32(ebx, bx); | |
1347 | R32(ecx, cx); | |
1348 | R32(edx, dx); | |
1349 | R32(edi, di); | |
1350 | R32(esi, si); | |
1351 | R32(ebp, bp); | |
1352 | R32(eax, ax); | |
cb757c41 RM |
1353 | R32(eip, ip); |
1354 | R32(esp, sp); | |
1355 | ||
40f0933d RM |
1356 | case offsetof(struct user32, regs.orig_eax): |
1357 | /* | |
8cb3ed13 RM |
1358 | * A 32-bit debugger setting orig_eax means to restore |
1359 | * the state of the task restarting a 32-bit syscall. | |
1360 | * Make sure we interpret the -ERESTART* codes correctly | |
1361 | * in case the task is not actually still sitting at the | |
1362 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 1363 | */ |
8cb3ed13 RM |
1364 | regs->orig_ax = value; |
1365 | if (syscall_get_nr(child, regs) >= 0) | |
1366 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
1367 | break; |
1368 | ||
cb757c41 RM |
1369 | case offsetof(struct user32, regs.eflags): |
1370 | return set_flags(child, value); | |
1371 | ||
1372 | case offsetof(struct user32, u_debugreg[0]) ... | |
1373 | offsetof(struct user32, u_debugreg[7]): | |
1374 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1375 | return ptrace_set_debugreg(child, regno / 4, value); | |
1376 | ||
1377 | default: | |
1378 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1379 | return -EIO; | |
1380 | ||
1381 | /* | |
1382 | * Other dummy fields in the virtual user structure | |
1383 | * are ignored | |
1384 | */ | |
1385 | break; | |
1386 | } | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | #undef R32 | |
1391 | #undef SEG32 | |
1392 | ||
1393 | #define R32(l,q) \ | |
1394 | case offsetof(struct user32, regs.l): \ | |
1395 | *val = regs->q; break | |
1396 | ||
1397 | #define SEG32(rs) \ | |
1398 | case offsetof(struct user32, regs.rs): \ | |
1399 | *val = get_segment_reg(child, \ | |
1400 | offsetof(struct user_regs_struct, rs)); \ | |
1401 | break | |
1402 | ||
1403 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1404 | { | |
1405 | struct pt_regs *regs = task_pt_regs(child); | |
1406 | ||
1407 | switch (regno) { | |
1408 | ||
1409 | SEG32(ds); | |
1410 | SEG32(es); | |
1411 | SEG32(fs); | |
1412 | SEG32(gs); | |
1413 | ||
1414 | R32(cs, cs); | |
1415 | R32(ss, ss); | |
1416 | R32(ebx, bx); | |
1417 | R32(ecx, cx); | |
1418 | R32(edx, dx); | |
1419 | R32(edi, di); | |
1420 | R32(esi, si); | |
1421 | R32(ebp, bp); | |
1422 | R32(eax, ax); | |
1423 | R32(orig_eax, orig_ax); | |
1424 | R32(eip, ip); | |
1425 | R32(esp, sp); | |
1426 | ||
1427 | case offsetof(struct user32, regs.eflags): | |
1428 | *val = get_flags(child); | |
1429 | break; | |
1430 | ||
1431 | case offsetof(struct user32, u_debugreg[0]) ... | |
1432 | offsetof(struct user32, u_debugreg[7]): | |
1433 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1434 | *val = ptrace_get_debugreg(child, regno / 4); | |
1435 | break; | |
1436 | ||
1437 | default: | |
1438 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1439 | return -EIO; | |
1440 | ||
1441 | /* | |
1442 | * Other dummy fields in the virtual user structure | |
1443 | * are ignored | |
1444 | */ | |
1445 | *val = 0; | |
1446 | break; | |
1447 | } | |
1448 | return 0; | |
1449 | } | |
1450 | ||
1451 | #undef R32 | |
1452 | #undef SEG32 | |
1453 | ||
91e7b707 RM |
1454 | static int genregs32_get(struct task_struct *target, |
1455 | const struct user_regset *regset, | |
1456 | unsigned int pos, unsigned int count, | |
1457 | void *kbuf, void __user *ubuf) | |
1458 | { | |
1459 | if (kbuf) { | |
1460 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1461 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1462 | getreg32(target, pos, k++); |
1463 | count -= sizeof(*k); | |
1464 | pos += sizeof(*k); | |
1465 | } | |
1466 | } else { | |
1467 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1468 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1469 | compat_ulong_t word; |
1470 | getreg32(target, pos, &word); | |
1471 | if (__put_user(word, u++)) | |
1472 | return -EFAULT; | |
1473 | count -= sizeof(*u); | |
1474 | pos += sizeof(*u); | |
1475 | } | |
1476 | } | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static int genregs32_set(struct task_struct *target, | |
1482 | const struct user_regset *regset, | |
1483 | unsigned int pos, unsigned int count, | |
1484 | const void *kbuf, const void __user *ubuf) | |
1485 | { | |
1486 | int ret = 0; | |
1487 | if (kbuf) { | |
1488 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1489 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1490 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1491 | count -= sizeof(*k); |
1492 | pos += sizeof(*k); | |
1493 | } | |
1494 | } else { | |
1495 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1496 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1497 | compat_ulong_t word; |
1498 | ret = __get_user(word, u++); | |
1499 | if (ret) | |
1500 | break; | |
f9cb02b0 | 1501 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1502 | count -= sizeof(*u); |
1503 | pos += sizeof(*u); | |
1504 | } | |
1505 | } | |
1506 | return ret; | |
1507 | } | |
1508 | ||
562b80ba RM |
1509 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1510 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1511 | { |
562b80ba RM |
1512 | unsigned long addr = caddr; |
1513 | unsigned long data = cdata; | |
099cd6e9 RM |
1514 | void __user *datap = compat_ptr(data); |
1515 | int ret; | |
1516 | __u32 val; | |
1517 | ||
099cd6e9 | 1518 | switch (request) { |
099cd6e9 RM |
1519 | case PTRACE_PEEKUSR: |
1520 | ret = getreg32(child, addr, &val); | |
1521 | if (ret == 0) | |
1522 | ret = put_user(val, (__u32 __user *)datap); | |
1523 | break; | |
1524 | ||
1525 | case PTRACE_POKEUSR: | |
1526 | ret = putreg32(child, addr, data); | |
1527 | break; | |
1528 | ||
5a4646a4 RM |
1529 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1530 | return copy_regset_to_user(child, &user_x86_32_view, | |
1531 | REGSET_GENERAL, | |
1532 | 0, sizeof(struct user_regs_struct32), | |
1533 | datap); | |
1534 | ||
1535 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1536 | return copy_regset_from_user(child, &user_x86_32_view, | |
1537 | REGSET_GENERAL, 0, | |
1538 | sizeof(struct user_regs_struct32), | |
1539 | datap); | |
1540 | ||
1541 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1542 | return copy_regset_to_user(child, &user_x86_32_view, | |
1543 | REGSET_FP, 0, | |
1544 | sizeof(struct user_i387_ia32_struct), | |
1545 | datap); | |
1546 | ||
1547 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1548 | return copy_regset_from_user( | |
1549 | child, &user_x86_32_view, REGSET_FP, | |
1550 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1551 | ||
1552 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1553 | return copy_regset_to_user(child, &user_x86_32_view, | |
1554 | REGSET_XFP, 0, | |
1555 | sizeof(struct user32_fxsr_struct), | |
1556 | datap); | |
1557 | ||
1558 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1559 | return copy_regset_from_user(child, &user_x86_32_view, | |
1560 | REGSET_XFP, 0, | |
1561 | sizeof(struct user32_fxsr_struct), | |
1562 | datap); | |
099cd6e9 | 1563 | |
562b80ba RM |
1564 | case PTRACE_GET_THREAD_AREA: |
1565 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1566 | #ifdef CONFIG_X86_PTRACE_BTS |
1567 | case PTRACE_BTS_CONFIG: | |
1568 | case PTRACE_BTS_STATUS: | |
1569 | case PTRACE_BTS_SIZE: | |
1570 | case PTRACE_BTS_GET: | |
1571 | case PTRACE_BTS_CLEAR: | |
1572 | case PTRACE_BTS_DRAIN: | |
1573 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1574 | return arch_ptrace(child, request, addr, data); |
1575 | ||
099cd6e9 | 1576 | default: |
fdadd54d | 1577 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1578 | } |
1579 | ||
099cd6e9 RM |
1580 | return ret; |
1581 | } | |
1582 | ||
cb757c41 RM |
1583 | #endif /* CONFIG_IA32_EMULATION */ |
1584 | ||
070459d9 RM |
1585 | #ifdef CONFIG_X86_64 |
1586 | ||
1587 | static const struct user_regset x86_64_regsets[] = { | |
1588 | [REGSET_GENERAL] = { | |
1589 | .core_note_type = NT_PRSTATUS, | |
1590 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1591 | .size = sizeof(long), .align = sizeof(long), | |
1592 | .get = genregs_get, .set = genregs_set | |
1593 | }, | |
1594 | [REGSET_FP] = { | |
1595 | .core_note_type = NT_PRFPREG, | |
1596 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1597 | .size = sizeof(long), .align = sizeof(long), | |
1598 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1599 | }, | |
325af5fb RM |
1600 | [REGSET_IOPERM64] = { |
1601 | .core_note_type = NT_386_IOPERM, | |
1602 | .n = IO_BITMAP_LONGS, | |
1603 | .size = sizeof(long), .align = sizeof(long), | |
1604 | .active = ioperm_active, .get = ioperm_get | |
1605 | }, | |
070459d9 RM |
1606 | }; |
1607 | ||
1608 | static const struct user_regset_view user_x86_64_view = { | |
1609 | .name = "x86_64", .e_machine = EM_X86_64, | |
1610 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1611 | }; | |
1612 | ||
1613 | #else /* CONFIG_X86_32 */ | |
1614 | ||
1615 | #define user_regs_struct32 user_regs_struct | |
1616 | #define genregs32_get genregs_get | |
1617 | #define genregs32_set genregs_set | |
1618 | ||
1f465f4e RM |
1619 | #define user_i387_ia32_struct user_i387_struct |
1620 | #define user32_fxsr_struct user_fxsr_struct | |
1621 | ||
070459d9 RM |
1622 | #endif /* CONFIG_X86_64 */ |
1623 | ||
1624 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1625 | static const struct user_regset x86_32_regsets[] = { | |
1626 | [REGSET_GENERAL] = { | |
1627 | .core_note_type = NT_PRSTATUS, | |
1628 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1629 | .size = sizeof(u32), .align = sizeof(u32), | |
1630 | .get = genregs32_get, .set = genregs32_set | |
1631 | }, | |
1632 | [REGSET_FP] = { | |
1633 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1634 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1635 | .size = sizeof(u32), .align = sizeof(u32), |
1636 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1637 | }, | |
1638 | [REGSET_XFP] = { | |
1639 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1640 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1641 | .size = sizeof(u32), .align = sizeof(u32), |
1642 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1643 | }, | |
1644 | [REGSET_TLS] = { | |
bb61682b | 1645 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1646 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1647 | .size = sizeof(struct user_desc), | |
1648 | .align = sizeof(struct user_desc), | |
1649 | .active = regset_tls_active, | |
1650 | .get = regset_tls_get, .set = regset_tls_set | |
1651 | }, | |
325af5fb RM |
1652 | [REGSET_IOPERM32] = { |
1653 | .core_note_type = NT_386_IOPERM, | |
1654 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1655 | .size = sizeof(u32), .align = sizeof(u32), | |
1656 | .active = ioperm_active, .get = ioperm_get | |
1657 | }, | |
070459d9 RM |
1658 | }; |
1659 | ||
1660 | static const struct user_regset_view user_x86_32_view = { | |
1661 | .name = "i386", .e_machine = EM_386, | |
1662 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1663 | }; | |
1664 | #endif | |
1665 | ||
1666 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1667 | { | |
1668 | #ifdef CONFIG_IA32_EMULATION | |
1669 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1670 | #endif | |
1671 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1672 | return &user_x86_32_view; | |
1673 | #endif | |
1674 | #ifdef CONFIG_X86_64 | |
1675 | return &user_x86_64_view; | |
1676 | #endif | |
1677 | } | |
1678 | ||
7f38551f ON |
1679 | static void fill_sigtrap_info(struct task_struct *tsk, |
1680 | struct pt_regs *regs, | |
1681 | int error_code, int si_code, | |
1682 | struct siginfo *info) | |
1da177e4 | 1683 | { |
1da177e4 LT |
1684 | tsk->thread.trap_no = 1; |
1685 | tsk->thread.error_code = error_code; | |
1686 | ||
7f38551f ON |
1687 | memset(info, 0, sizeof(*info)); |
1688 | info->si_signo = SIGTRAP; | |
1689 | info->si_code = si_code; | |
1690 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1691 | } | |
1692 | ||
1693 | void user_single_step_siginfo(struct task_struct *tsk, | |
1694 | struct pt_regs *regs, | |
1695 | struct siginfo *info) | |
1696 | { | |
1697 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1698 | } | |
1da177e4 | 1699 | |
7f38551f ON |
1700 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1701 | int error_code, int si_code) | |
1702 | { | |
1703 | struct siginfo info; | |
1da177e4 | 1704 | |
7f38551f | 1705 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1706 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1707 | force_sig_info(SIGTRAP, &info, tsk); |
1708 | } | |
1709 | ||
86976cd8 | 1710 | |
d4d67150 RM |
1711 | #ifdef CONFIG_X86_32 |
1712 | # define IS_IA32 1 | |
1713 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1714 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1715 | #else |
1716 | # define IS_IA32 0 | |
1717 | #endif | |
1718 | ||
1719 | /* | |
1720 | * We must return the syscall number to actually look up in the table. | |
1721 | * This can be -1L to skip running any syscall at all. | |
1722 | */ | |
1723 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1724 | { |
d4d67150 RM |
1725 | long ret = 0; |
1726 | ||
380fdd75 RM |
1727 | /* |
1728 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1729 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1730 | * If user-mode had set TF itself, then it's still clear from | |
1731 | * do_debug() and we need to set it again to restore the user | |
1732 | * state. If we entered on the slow path, TF was already set. | |
1733 | */ | |
1734 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1735 | regs->flags |= X86_EFLAGS_TF; | |
1736 | ||
86976cd8 RM |
1737 | /* do the secure computing check first */ |
1738 | secure_computing(regs->orig_ax); | |
1739 | ||
d4d67150 RM |
1740 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1741 | ret = -1L; | |
1742 | ||
eeea3c3f RM |
1743 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1744 | tracehook_report_syscall_entry(regs)) | |
1745 | ret = -1L; | |
86976cd8 | 1746 | |
66700001 | 1747 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1748 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1749 | |
86976cd8 | 1750 | if (unlikely(current->audit_context)) { |
d4d67150 | 1751 | if (IS_IA32) |
86976cd8 RM |
1752 | audit_syscall_entry(AUDIT_ARCH_I386, |
1753 | regs->orig_ax, | |
1754 | regs->bx, regs->cx, | |
1755 | regs->dx, regs->si); | |
d4d67150 RM |
1756 | #ifdef CONFIG_X86_64 |
1757 | else | |
86976cd8 RM |
1758 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1759 | regs->orig_ax, | |
1760 | regs->di, regs->si, | |
1761 | regs->dx, regs->r10); | |
d4d67150 | 1762 | #endif |
86976cd8 | 1763 | } |
d4d67150 RM |
1764 | |
1765 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1766 | } |
1767 | ||
d4d67150 | 1768 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1769 | { |
d5196503 ON |
1770 | bool step; |
1771 | ||
86976cd8 RM |
1772 | if (unlikely(current->audit_context)) |
1773 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1774 | ||
66700001 | 1775 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1776 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1777 | |
d4d67150 RM |
1778 | /* |
1779 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1780 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1781 | * We already reported this syscall instruction in | |
d5196503 | 1782 | * syscall_trace_enter(). |
d4d67150 | 1783 | */ |
d5196503 ON |
1784 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1785 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1786 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1787 | tracehook_report_syscall_exit(regs, step); | |
d4d67150 | 1788 | } |