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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 | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/smp.h> | |
1da177e4 | 11 | #include <linux/errno.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <linux/ptrace.h> |
91e7b707 | 14 | #include <linux/regset.h> |
eeea3c3f | 15 | #include <linux/tracehook.h> |
1da177e4 | 16 | #include <linux/user.h> |
070459d9 | 17 | #include <linux/elf.h> |
1da177e4 LT |
18 | #include <linux/security.h> |
19 | #include <linux/audit.h> | |
20 | #include <linux/seccomp.h> | |
7ed20e1a | 21 | #include <linux/signal.h> |
24f1e32c FW |
22 | #include <linux/perf_event.h> |
23 | #include <linux/hw_breakpoint.h> | |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/system.h> | |
28 | #include <asm/processor.h> | |
29 | #include <asm/i387.h> | |
30 | #include <asm/debugreg.h> | |
31 | #include <asm/ldt.h> | |
32 | #include <asm/desc.h> | |
2047b08b RM |
33 | #include <asm/prctl.h> |
34 | #include <asm/proto.h> | |
72f674d2 | 35 | #include <asm/hw_breakpoint.h> |
eee3af4a | 36 | |
070459d9 RM |
37 | #include "tls.h" |
38 | ||
1c569f02 JS |
39 | #define CREATE_TRACE_POINTS |
40 | #include <trace/events/syscalls.h> | |
41 | ||
070459d9 RM |
42 | enum x86_regset { |
43 | REGSET_GENERAL, | |
44 | REGSET_FP, | |
45 | REGSET_XFP, | |
325af5fb | 46 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 47 | REGSET_XSTATE, |
070459d9 | 48 | REGSET_TLS, |
325af5fb | 49 | REGSET_IOPERM32, |
070459d9 | 50 | }; |
eee3af4a | 51 | |
b1cf540f MH |
52 | struct pt_regs_offset { |
53 | const char *name; | |
54 | int offset; | |
55 | }; | |
56 | ||
57 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
58 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
59 | ||
60 | static const struct pt_regs_offset regoffset_table[] = { | |
61 | #ifdef CONFIG_X86_64 | |
62 | REG_OFFSET_NAME(r15), | |
63 | REG_OFFSET_NAME(r14), | |
64 | REG_OFFSET_NAME(r13), | |
65 | REG_OFFSET_NAME(r12), | |
66 | REG_OFFSET_NAME(r11), | |
67 | REG_OFFSET_NAME(r10), | |
68 | REG_OFFSET_NAME(r9), | |
69 | REG_OFFSET_NAME(r8), | |
70 | #endif | |
71 | REG_OFFSET_NAME(bx), | |
72 | REG_OFFSET_NAME(cx), | |
73 | REG_OFFSET_NAME(dx), | |
74 | REG_OFFSET_NAME(si), | |
75 | REG_OFFSET_NAME(di), | |
76 | REG_OFFSET_NAME(bp), | |
77 | REG_OFFSET_NAME(ax), | |
78 | #ifdef CONFIG_X86_32 | |
79 | REG_OFFSET_NAME(ds), | |
80 | REG_OFFSET_NAME(es), | |
81 | REG_OFFSET_NAME(fs), | |
82 | REG_OFFSET_NAME(gs), | |
83 | #endif | |
84 | REG_OFFSET_NAME(orig_ax), | |
85 | REG_OFFSET_NAME(ip), | |
86 | REG_OFFSET_NAME(cs), | |
87 | REG_OFFSET_NAME(flags), | |
88 | REG_OFFSET_NAME(sp), | |
89 | REG_OFFSET_NAME(ss), | |
90 | REG_OFFSET_END, | |
91 | }; | |
92 | ||
93 | /** | |
94 | * regs_query_register_offset() - query register offset from its name | |
95 | * @name: the name of a register | |
96 | * | |
97 | * regs_query_register_offset() returns the offset of a register in struct | |
98 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
99 | */ | |
100 | int regs_query_register_offset(const char *name) | |
101 | { | |
102 | const struct pt_regs_offset *roff; | |
103 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
104 | if (!strcmp(roff->name, name)) | |
105 | return roff->offset; | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | /** | |
110 | * regs_query_register_name() - query register name from its offset | |
111 | * @offset: the offset of a register in struct pt_regs. | |
112 | * | |
113 | * regs_query_register_name() returns the name of a register from its | |
114 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
115 | */ | |
116 | const char *regs_query_register_name(unsigned int offset) | |
117 | { | |
118 | const struct pt_regs_offset *roff; | |
119 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
120 | if (roff->offset == offset) | |
121 | return roff->name; | |
122 | return NULL; | |
123 | } | |
124 | ||
125 | static const int arg_offs_table[] = { | |
126 | #ifdef CONFIG_X86_32 | |
127 | [0] = offsetof(struct pt_regs, ax), | |
128 | [1] = offsetof(struct pt_regs, dx), | |
129 | [2] = offsetof(struct pt_regs, cx) | |
130 | #else /* CONFIG_X86_64 */ | |
131 | [0] = offsetof(struct pt_regs, di), | |
132 | [1] = offsetof(struct pt_regs, si), | |
133 | [2] = offsetof(struct pt_regs, dx), | |
134 | [3] = offsetof(struct pt_regs, cx), | |
135 | [4] = offsetof(struct pt_regs, r8), | |
136 | [5] = offsetof(struct pt_regs, r9) | |
137 | #endif | |
138 | }; | |
139 | ||
1da177e4 LT |
140 | /* |
141 | * does not yet catch signals sent when the child dies. | |
142 | * in exit.c or in signal.c. | |
143 | */ | |
144 | ||
9f155b98 CE |
145 | /* |
146 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 147 | */ |
e39c2891 RM |
148 | #define FLAG_MASK_32 ((unsigned long) \ |
149 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
150 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
151 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
152 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
153 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
154 | ||
2047b08b RM |
155 | /* |
156 | * Determines whether a value may be installed in a segment register. | |
157 | */ | |
158 | static inline bool invalid_selector(u16 value) | |
159 | { | |
160 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
161 | } | |
162 | ||
163 | #ifdef CONFIG_X86_32 | |
164 | ||
e39c2891 | 165 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 166 | |
4fe702c7 | 167 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 168 | { |
65ea5b03 | 169 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 170 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
171 | } |
172 | ||
06ee1b68 | 173 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 174 | { |
06ee1b68 RM |
175 | /* |
176 | * Returning the value truncates it to 16 bits. | |
177 | */ | |
178 | unsigned int retval; | |
179 | if (offset != offsetof(struct user_regs_struct, gs)) | |
180 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
181 | else { | |
06ee1b68 | 182 | if (task == current) |
d9a89a26 TH |
183 | retval = get_user_gs(task_pt_regs(task)); |
184 | else | |
185 | retval = task_user_gs(task); | |
06ee1b68 RM |
186 | } |
187 | return retval; | |
188 | } | |
189 | ||
190 | static int set_segment_reg(struct task_struct *task, | |
191 | unsigned long offset, u16 value) | |
192 | { | |
193 | /* | |
194 | * The value argument was already truncated to 16 bits. | |
195 | */ | |
2047b08b | 196 | if (invalid_selector(value)) |
06ee1b68 RM |
197 | return -EIO; |
198 | ||
c63855d0 RM |
199 | /* |
200 | * For %cs and %ss we cannot permit a null selector. | |
201 | * We can permit a bogus selector as long as it has USER_RPL. | |
202 | * Null selectors are fine for other segment registers, but | |
203 | * we will never get back to user mode with invalid %cs or %ss | |
204 | * and will take the trap in iret instead. Much code relies | |
205 | * on user_mode() to distinguish a user trap frame (which can | |
206 | * safely use invalid selectors) from a kernel trap frame. | |
207 | */ | |
208 | switch (offset) { | |
209 | case offsetof(struct user_regs_struct, cs): | |
210 | case offsetof(struct user_regs_struct, ss): | |
211 | if (unlikely(value == 0)) | |
212 | return -EIO; | |
213 | ||
214 | default: | |
06ee1b68 | 215 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
216 | break; |
217 | ||
218 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 219 | if (task == current) |
d9a89a26 TH |
220 | set_user_gs(task_pt_regs(task), value); |
221 | else | |
222 | task_user_gs(task) = value; | |
1da177e4 | 223 | } |
06ee1b68 | 224 | |
1da177e4 LT |
225 | return 0; |
226 | } | |
227 | ||
2047b08b RM |
228 | #else /* CONFIG_X86_64 */ |
229 | ||
230 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
231 | ||
232 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
233 | { | |
234 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
235 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
236 | } | |
237 | ||
238 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
239 | { | |
240 | /* | |
241 | * Returning the value truncates it to 16 bits. | |
242 | */ | |
243 | unsigned int seg; | |
244 | ||
245 | switch (offset) { | |
246 | case offsetof(struct user_regs_struct, fs): | |
247 | if (task == current) { | |
248 | /* Older gas can't assemble movq %?s,%r?? */ | |
249 | asm("movl %%fs,%0" : "=r" (seg)); | |
250 | return seg; | |
251 | } | |
252 | return task->thread.fsindex; | |
253 | case offsetof(struct user_regs_struct, gs): | |
254 | if (task == current) { | |
255 | asm("movl %%gs,%0" : "=r" (seg)); | |
256 | return seg; | |
257 | } | |
258 | return task->thread.gsindex; | |
259 | case offsetof(struct user_regs_struct, ds): | |
260 | if (task == current) { | |
261 | asm("movl %%ds,%0" : "=r" (seg)); | |
262 | return seg; | |
263 | } | |
264 | return task->thread.ds; | |
265 | case offsetof(struct user_regs_struct, es): | |
266 | if (task == current) { | |
267 | asm("movl %%es,%0" : "=r" (seg)); | |
268 | return seg; | |
269 | } | |
270 | return task->thread.es; | |
271 | ||
272 | case offsetof(struct user_regs_struct, cs): | |
273 | case offsetof(struct user_regs_struct, ss): | |
274 | break; | |
275 | } | |
276 | return *pt_regs_access(task_pt_regs(task), offset); | |
277 | } | |
278 | ||
279 | static int set_segment_reg(struct task_struct *task, | |
280 | unsigned long offset, u16 value) | |
281 | { | |
282 | /* | |
283 | * The value argument was already truncated to 16 bits. | |
284 | */ | |
285 | if (invalid_selector(value)) | |
286 | return -EIO; | |
287 | ||
288 | switch (offset) { | |
289 | case offsetof(struct user_regs_struct,fs): | |
290 | /* | |
291 | * If this is setting fs as for normal 64-bit use but | |
292 | * setting fs_base has implicitly changed it, leave it. | |
293 | */ | |
294 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
295 | task->thread.fs != 0) || | |
296 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
297 | task->thread.fs == 0)) | |
298 | break; | |
299 | task->thread.fsindex = value; | |
300 | if (task == current) | |
301 | loadsegment(fs, task->thread.fsindex); | |
302 | break; | |
303 | case offsetof(struct user_regs_struct,gs): | |
304 | /* | |
305 | * If this is setting gs as for normal 64-bit use but | |
306 | * setting gs_base has implicitly changed it, leave it. | |
307 | */ | |
308 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
309 | task->thread.gs != 0) || | |
310 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
311 | task->thread.gs == 0)) | |
312 | break; | |
313 | task->thread.gsindex = value; | |
314 | if (task == current) | |
315 | load_gs_index(task->thread.gsindex); | |
316 | break; | |
317 | case offsetof(struct user_regs_struct,ds): | |
318 | task->thread.ds = value; | |
319 | if (task == current) | |
320 | loadsegment(ds, task->thread.ds); | |
321 | break; | |
322 | case offsetof(struct user_regs_struct,es): | |
323 | task->thread.es = value; | |
324 | if (task == current) | |
325 | loadsegment(es, task->thread.es); | |
326 | break; | |
327 | ||
328 | /* | |
329 | * Can't actually change these in 64-bit mode. | |
330 | */ | |
331 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
332 | if (unlikely(value == 0)) |
333 | return -EIO; | |
2047b08b RM |
334 | #ifdef CONFIG_IA32_EMULATION |
335 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
336 | task_pt_regs(task)->cs = value; | |
2047b08b | 337 | #endif |
cb757c41 | 338 | break; |
2047b08b | 339 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
340 | if (unlikely(value == 0)) |
341 | return -EIO; | |
2047b08b RM |
342 | #ifdef CONFIG_IA32_EMULATION |
343 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
344 | task_pt_regs(task)->ss = value; | |
2047b08b | 345 | #endif |
cb757c41 | 346 | break; |
2047b08b RM |
347 | } |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
2047b08b RM |
352 | #endif /* CONFIG_X86_32 */ |
353 | ||
06ee1b68 | 354 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 355 | { |
06ee1b68 RM |
356 | unsigned long retval = task_pt_regs(task)->flags; |
357 | ||
358 | /* | |
359 | * If the debugger set TF, hide it from the readout. | |
360 | */ | |
361 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
362 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 363 | |
1da177e4 LT |
364 | return retval; |
365 | } | |
366 | ||
06ee1b68 RM |
367 | static int set_flags(struct task_struct *task, unsigned long value) |
368 | { | |
369 | struct pt_regs *regs = task_pt_regs(task); | |
370 | ||
371 | /* | |
372 | * If the user value contains TF, mark that | |
373 | * it was not "us" (the debugger) that set it. | |
374 | * If not, make sure it stays set if we had. | |
375 | */ | |
376 | if (value & X86_EFLAGS_TF) | |
377 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
378 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
379 | value |= X86_EFLAGS_TF; | |
380 | ||
381 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | static int putreg(struct task_struct *child, | |
387 | unsigned long offset, unsigned long value) | |
388 | { | |
389 | switch (offset) { | |
390 | case offsetof(struct user_regs_struct, cs): | |
391 | case offsetof(struct user_regs_struct, ds): | |
392 | case offsetof(struct user_regs_struct, es): | |
393 | case offsetof(struct user_regs_struct, fs): | |
394 | case offsetof(struct user_regs_struct, gs): | |
395 | case offsetof(struct user_regs_struct, ss): | |
396 | return set_segment_reg(child, offset, value); | |
397 | ||
398 | case offsetof(struct user_regs_struct, flags): | |
399 | return set_flags(child, value); | |
2047b08b RM |
400 | |
401 | #ifdef CONFIG_X86_64 | |
402 | case offsetof(struct user_regs_struct,fs_base): | |
403 | if (value >= TASK_SIZE_OF(child)) | |
404 | return -EIO; | |
405 | /* | |
406 | * When changing the segment base, use do_arch_prctl | |
407 | * to set either thread.fs or thread.fsindex and the | |
408 | * corresponding GDT slot. | |
409 | */ | |
410 | if (child->thread.fs != value) | |
411 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
412 | return 0; | |
413 | case offsetof(struct user_regs_struct,gs_base): | |
414 | /* | |
415 | * Exactly the same here as the %fs handling above. | |
416 | */ | |
417 | if (value >= TASK_SIZE_OF(child)) | |
418 | return -EIO; | |
419 | if (child->thread.gs != value) | |
420 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
421 | return 0; | |
422 | #endif | |
06ee1b68 RM |
423 | } |
424 | ||
425 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
430 | { | |
431 | switch (offset) { | |
432 | case offsetof(struct user_regs_struct, cs): | |
433 | case offsetof(struct user_regs_struct, ds): | |
434 | case offsetof(struct user_regs_struct, es): | |
435 | case offsetof(struct user_regs_struct, fs): | |
436 | case offsetof(struct user_regs_struct, gs): | |
437 | case offsetof(struct user_regs_struct, ss): | |
438 | return get_segment_reg(task, offset); | |
439 | ||
440 | case offsetof(struct user_regs_struct, flags): | |
441 | return get_flags(task); | |
2047b08b RM |
442 | |
443 | #ifdef CONFIG_X86_64 | |
444 | case offsetof(struct user_regs_struct, fs_base): { | |
445 | /* | |
446 | * do_arch_prctl may have used a GDT slot instead of | |
447 | * the MSR. To userland, it appears the same either | |
448 | * way, except the %fs segment selector might not be 0. | |
449 | */ | |
450 | unsigned int seg = task->thread.fsindex; | |
451 | if (task->thread.fs != 0) | |
452 | return task->thread.fs; | |
453 | if (task == current) | |
454 | asm("movl %%fs,%0" : "=r" (seg)); | |
455 | if (seg != FS_TLS_SEL) | |
456 | return 0; | |
457 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
458 | } | |
459 | case offsetof(struct user_regs_struct, gs_base): { | |
460 | /* | |
461 | * Exactly the same here as the %fs handling above. | |
462 | */ | |
463 | unsigned int seg = task->thread.gsindex; | |
464 | if (task->thread.gs != 0) | |
465 | return task->thread.gs; | |
466 | if (task == current) | |
467 | asm("movl %%gs,%0" : "=r" (seg)); | |
468 | if (seg != GS_TLS_SEL) | |
469 | return 0; | |
470 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
471 | } | |
472 | #endif | |
06ee1b68 RM |
473 | } |
474 | ||
475 | return *pt_regs_access(task_pt_regs(task), offset); | |
476 | } | |
477 | ||
91e7b707 RM |
478 | static int genregs_get(struct task_struct *target, |
479 | const struct user_regset *regset, | |
480 | unsigned int pos, unsigned int count, | |
481 | void *kbuf, void __user *ubuf) | |
482 | { | |
483 | if (kbuf) { | |
484 | unsigned long *k = kbuf; | |
04a1e62c | 485 | while (count >= sizeof(*k)) { |
91e7b707 RM |
486 | *k++ = getreg(target, pos); |
487 | count -= sizeof(*k); | |
488 | pos += sizeof(*k); | |
489 | } | |
490 | } else { | |
491 | unsigned long __user *u = ubuf; | |
04a1e62c | 492 | while (count >= sizeof(*u)) { |
91e7b707 RM |
493 | if (__put_user(getreg(target, pos), u++)) |
494 | return -EFAULT; | |
495 | count -= sizeof(*u); | |
496 | pos += sizeof(*u); | |
497 | } | |
498 | } | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
503 | static int genregs_set(struct task_struct *target, | |
504 | const struct user_regset *regset, | |
505 | unsigned int pos, unsigned int count, | |
506 | const void *kbuf, const void __user *ubuf) | |
507 | { | |
508 | int ret = 0; | |
509 | if (kbuf) { | |
510 | const unsigned long *k = kbuf; | |
04a1e62c | 511 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
512 | ret = putreg(target, pos, *k++); |
513 | count -= sizeof(*k); | |
514 | pos += sizeof(*k); | |
515 | } | |
516 | } else { | |
517 | const unsigned long __user *u = ubuf; | |
04a1e62c | 518 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
519 | unsigned long word; |
520 | ret = __get_user(word, u++); | |
521 | if (ret) | |
522 | break; | |
523 | ret = putreg(target, pos, word); | |
524 | count -= sizeof(*u); | |
525 | pos += sizeof(*u); | |
526 | } | |
527 | } | |
528 | return ret; | |
529 | } | |
530 | ||
a8b0ca17 | 531 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
532 | struct perf_sample_data *data, |
533 | struct pt_regs *regs) | |
d9771e8c | 534 | { |
0f534093 | 535 | int i; |
24f1e32c | 536 | struct thread_struct *thread = &(current->thread); |
0f534093 | 537 | |
72f674d2 P |
538 | /* |
539 | * Store in the virtual DR6 register the fact that the breakpoint | |
540 | * was hit so the thread's debugger will see it. | |
541 | */ | |
24f1e32c FW |
542 | for (i = 0; i < HBP_NUM; i++) { |
543 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 544 | break; |
24f1e32c | 545 | } |
d9771e8c | 546 | |
72f674d2 P |
547 | thread->debugreg6 |= (DR_TRAP0 << i); |
548 | } | |
d9771e8c | 549 | |
d9771e8c | 550 | /* |
24f1e32c FW |
551 | * Walk through every ptrace breakpoints for this thread and |
552 | * build the dr7 value on top of their attributes. | |
553 | * | |
d9771e8c | 554 | */ |
24f1e32c | 555 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 556 | { |
24f1e32c FW |
557 | int i; |
558 | int dr7 = 0; | |
559 | struct arch_hw_breakpoint *info; | |
560 | ||
561 | for (i = 0; i < HBP_NUM; i++) { | |
562 | if (bp[i] && !bp[i]->attr.disabled) { | |
563 | info = counter_arch_bp(bp[i]); | |
564 | dr7 |= encode_dr7(i, info->len, info->type); | |
565 | } | |
0f534093 | 566 | } |
24f1e32c FW |
567 | |
568 | return dr7; | |
d9771e8c RM |
569 | } |
570 | ||
44234adc | 571 | static int |
5fa10b28 | 572 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
1cedae72 | 573 | struct task_struct *tsk, int disabled) |
5fa10b28 FW |
574 | { |
575 | int err; | |
576 | int gen_len, gen_type; | |
b326e956 | 577 | struct perf_event_attr attr; |
5fa10b28 FW |
578 | |
579 | /* | |
c9404c9c | 580 | * We should have at least an inactive breakpoint at this |
5fa10b28 FW |
581 | * slot. It means the user is writing dr7 without having |
582 | * written the address register first | |
583 | */ | |
584 | if (!bp) | |
44234adc | 585 | return -EINVAL; |
5fa10b28 FW |
586 | |
587 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); | |
588 | if (err) | |
44234adc | 589 | return err; |
5fa10b28 FW |
590 | |
591 | attr = bp->attr; | |
592 | attr.bp_len = gen_len; | |
593 | attr.bp_type = gen_type; | |
1cedae72 | 594 | attr.disabled = disabled; |
5fa10b28 | 595 | |
2f0993e0 | 596 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
597 | } |
598 | ||
72f674d2 P |
599 | /* |
600 | * Handle ptrace writes to debug register 7. | |
601 | */ | |
602 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 603 | { |
72f674d2 | 604 | struct thread_struct *thread = &(tsk->thread); |
24f1e32c | 605 | unsigned long old_dr7; |
72f674d2 P |
606 | int i, orig_ret = 0, rc = 0; |
607 | int enabled, second_pass = 0; | |
608 | unsigned len, type; | |
24f1e32c | 609 | struct perf_event *bp; |
72f674d2 | 610 | |
87dc669b FW |
611 | if (ptrace_get_breakpoints(tsk) < 0) |
612 | return -ESRCH; | |
613 | ||
72f674d2 | 614 | data &= ~DR_CONTROL_RESERVED; |
24f1e32c | 615 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
72f674d2 P |
616 | restore: |
617 | /* | |
618 | * Loop through all the hardware breakpoints, making the | |
619 | * appropriate changes to each. | |
620 | */ | |
621 | for (i = 0; i < HBP_NUM; i++) { | |
622 | enabled = decode_dr7(data, i, &len, &type); | |
24f1e32c | 623 | bp = thread->ptrace_bps[i]; |
72f674d2 P |
624 | |
625 | if (!enabled) { | |
626 | if (bp) { | |
24f1e32c FW |
627 | /* |
628 | * Don't unregister the breakpoints right-away, | |
72f674d2 P |
629 | * unless all register_user_hw_breakpoint() |
630 | * requests have succeeded. This prevents | |
631 | * any window of opportunity for debug | |
632 | * register grabbing by other users. | |
633 | */ | |
634 | if (!second_pass) | |
635 | continue; | |
1cedae72 | 636 | |
44234adc | 637 | rc = ptrace_modify_breakpoint(bp, len, type, |
1cedae72 | 638 | tsk, 1); |
44234adc | 639 | if (rc) |
1cedae72 | 640 | break; |
72f674d2 P |
641 | } |
642 | continue; | |
643 | } | |
0f534093 | 644 | |
44234adc FW |
645 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
646 | if (rc) | |
24f1e32c | 647 | break; |
72f674d2 P |
648 | } |
649 | /* | |
650 | * Make a second pass to free the remaining unused breakpoints | |
651 | * or to restore the original breakpoints if an error occurred. | |
652 | */ | |
653 | if (!second_pass) { | |
654 | second_pass = 1; | |
655 | if (rc < 0) { | |
656 | orig_ret = rc; | |
657 | data = old_dr7; | |
658 | } | |
659 | goto restore; | |
660 | } | |
87dc669b FW |
661 | |
662 | ptrace_put_breakpoints(tsk); | |
663 | ||
72f674d2 P |
664 | return ((orig_ret < 0) ? orig_ret : rc); |
665 | } | |
0f534093 | 666 | |
72f674d2 P |
667 | /* |
668 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
669 | */ | |
9d22b536 | 670 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 P |
671 | { |
672 | struct thread_struct *thread = &(tsk->thread); | |
673 | unsigned long val = 0; | |
674 | ||
24f1e32c FW |
675 | if (n < HBP_NUM) { |
676 | struct perf_event *bp; | |
87dc669b FW |
677 | |
678 | if (ptrace_get_breakpoints(tsk) < 0) | |
679 | return -ESRCH; | |
680 | ||
24f1e32c FW |
681 | bp = thread->ptrace_bps[n]; |
682 | if (!bp) | |
87dc669b FW |
683 | val = 0; |
684 | else | |
685 | val = bp->hw.info.address; | |
686 | ||
687 | ptrace_put_breakpoints(tsk); | |
24f1e32c | 688 | } else if (n == 6) { |
72f674d2 | 689 | val = thread->debugreg6; |
24f1e32c | 690 | } else if (n == 7) { |
326264a0 | 691 | val = thread->ptrace_dr7; |
24f1e32c | 692 | } |
72f674d2 P |
693 | return val; |
694 | } | |
0f534093 | 695 | |
24f1e32c FW |
696 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
697 | unsigned long addr) | |
698 | { | |
699 | struct perf_event *bp; | |
700 | struct thread_struct *t = &tsk->thread; | |
b326e956 | 701 | struct perf_event_attr attr; |
87dc669b FW |
702 | int err = 0; |
703 | ||
704 | if (ptrace_get_breakpoints(tsk) < 0) | |
705 | return -ESRCH; | |
24f1e32c FW |
706 | |
707 | if (!t->ptrace_bps[nr]) { | |
73266fc1 | 708 | ptrace_breakpoint_init(&attr); |
d9771e8c | 709 | /* |
24f1e32c FW |
710 | * Put stub len and type to register (reserve) an inactive but |
711 | * correct bp | |
d9771e8c | 712 | */ |
5fa10b28 FW |
713 | attr.bp_addr = addr; |
714 | attr.bp_len = HW_BREAKPOINT_LEN_1; | |
715 | attr.bp_type = HW_BREAKPOINT_W; | |
716 | attr.disabled = 1; | |
717 | ||
4dc0da86 AK |
718 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, |
719 | NULL, tsk); | |
44234adc FW |
720 | |
721 | /* | |
722 | * CHECKME: the previous code returned -EIO if the addr wasn't | |
723 | * a valid task virtual addr. The new one will return -EINVAL in | |
724 | * this case. | |
725 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
726 | * but -EIO looks better for ptrace, since we refuse a register | |
727 | * writing for the user. And anyway this is the previous | |
728 | * behaviour. | |
729 | */ | |
87dc669b FW |
730 | if (IS_ERR(bp)) { |
731 | err = PTR_ERR(bp); | |
732 | goto put; | |
733 | } | |
44234adc FW |
734 | |
735 | t->ptrace_bps[nr] = bp; | |
24f1e32c FW |
736 | } else { |
737 | bp = t->ptrace_bps[nr]; | |
5fa10b28 FW |
738 | |
739 | attr = bp->attr; | |
740 | attr.bp_addr = addr; | |
44234adc | 741 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 742 | } |
24f1e32c | 743 | |
87dc669b FW |
744 | put: |
745 | ptrace_put_breakpoints(tsk); | |
746 | return err; | |
d9771e8c RM |
747 | } |
748 | ||
72f674d2 P |
749 | /* |
750 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
751 | */ | |
98b8b99a HS |
752 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
753 | unsigned long val) | |
72f674d2 P |
754 | { |
755 | struct thread_struct *thread = &(tsk->thread); | |
756 | int rc = 0; | |
757 | ||
758 | /* There are no DR4 or DR5 registers */ | |
759 | if (n == 4 || n == 5) | |
760 | return -EIO; | |
761 | ||
762 | if (n == 6) { | |
24f1e32c | 763 | thread->debugreg6 = val; |
72f674d2 | 764 | goto ret_path; |
d9771e8c | 765 | } |
72f674d2 | 766 | if (n < HBP_NUM) { |
24f1e32c FW |
767 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
768 | if (rc) | |
769 | return rc; | |
72f674d2 P |
770 | } |
771 | /* All that's left is DR7 */ | |
326264a0 | 772 | if (n == 7) { |
72f674d2 | 773 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
774 | if (!rc) |
775 | thread->ptrace_dr7 = val; | |
776 | } | |
d9771e8c | 777 | |
72f674d2 P |
778 | ret_path: |
779 | return rc; | |
d9771e8c RM |
780 | } |
781 | ||
325af5fb RM |
782 | /* |
783 | * These access the current or another (stopped) task's io permission | |
784 | * bitmap for debugging or core dump. | |
785 | */ | |
786 | static int ioperm_active(struct task_struct *target, | |
787 | const struct user_regset *regset) | |
788 | { | |
789 | return target->thread.io_bitmap_max / regset->size; | |
790 | } | |
b4ef95de | 791 | |
325af5fb RM |
792 | static int ioperm_get(struct task_struct *target, |
793 | const struct user_regset *regset, | |
794 | unsigned int pos, unsigned int count, | |
795 | void *kbuf, void __user *ubuf) | |
eee3af4a | 796 | { |
325af5fb | 797 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
798 | return -ENXIO; |
799 | ||
325af5fb RM |
800 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
801 | target->thread.io_bitmap_ptr, | |
802 | 0, IO_BITMAP_BYTES); | |
803 | } | |
804 | ||
1da177e4 LT |
805 | /* |
806 | * Called by kernel/ptrace.c when detaching.. | |
807 | * | |
808 | * Make sure the single step bit is not set. | |
809 | */ | |
810 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 811 | { |
7f232343 | 812 | user_disable_single_step(child); |
e9c86c78 | 813 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 814 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 815 | #endif |
1da177e4 LT |
816 | } |
817 | ||
5a4646a4 RM |
818 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
819 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
820 | #endif | |
821 | ||
9b05a69e NK |
822 | long arch_ptrace(struct task_struct *child, long request, |
823 | unsigned long addr, unsigned long data) | |
1da177e4 | 824 | { |
5a4646a4 | 825 | int ret; |
1da177e4 LT |
826 | unsigned long __user *datap = (unsigned long __user *)data; |
827 | ||
1da177e4 | 828 | switch (request) { |
1da177e4 LT |
829 | /* read the word at location addr in the USER area. */ |
830 | case PTRACE_PEEKUSR: { | |
831 | unsigned long tmp; | |
832 | ||
833 | ret = -EIO; | |
eb5a3699 | 834 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
835 | break; |
836 | ||
837 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 838 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 839 | tmp = getreg(child, addr); |
e9c86c78 RM |
840 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
841 | addr <= offsetof(struct user, u_debugreg[7])) { | |
842 | addr -= offsetof(struct user, u_debugreg[0]); | |
843 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
844 | } |
845 | ret = put_user(tmp, datap); | |
846 | break; | |
847 | } | |
848 | ||
1da177e4 LT |
849 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
850 | ret = -EIO; | |
eb5a3699 | 851 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
852 | break; |
853 | ||
e9c86c78 | 854 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 855 | ret = putreg(child, addr, data); |
e9c86c78 RM |
856 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
857 | addr <= offsetof(struct user, u_debugreg[7])) { | |
858 | addr -= offsetof(struct user, u_debugreg[0]); | |
859 | ret = ptrace_set_debugreg(child, | |
860 | addr / sizeof(data), data); | |
1da177e4 | 861 | } |
e9c86c78 | 862 | break; |
1da177e4 | 863 | |
5a4646a4 RM |
864 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
865 | return copy_regset_to_user(child, | |
866 | task_user_regset_view(current), | |
867 | REGSET_GENERAL, | |
868 | 0, sizeof(struct user_regs_struct), | |
869 | datap); | |
870 | ||
871 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
872 | return copy_regset_from_user(child, | |
873 | task_user_regset_view(current), | |
874 | REGSET_GENERAL, | |
875 | 0, sizeof(struct user_regs_struct), | |
876 | datap); | |
877 | ||
878 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
879 | return copy_regset_to_user(child, | |
880 | task_user_regset_view(current), | |
881 | REGSET_FP, | |
882 | 0, sizeof(struct user_i387_struct), | |
883 | datap); | |
884 | ||
885 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
886 | return copy_regset_from_user(child, | |
887 | task_user_regset_view(current), | |
888 | REGSET_FP, | |
889 | 0, sizeof(struct user_i387_struct), | |
890 | datap); | |
1da177e4 | 891 | |
e9c86c78 | 892 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
893 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
894 | return copy_regset_to_user(child, &user_x86_32_view, | |
895 | REGSET_XFP, | |
896 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 897 | datap) ? -EIO : 0; |
5a4646a4 RM |
898 | |
899 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
900 | return copy_regset_from_user(child, &user_x86_32_view, | |
901 | REGSET_XFP, | |
902 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 903 | datap) ? -EIO : 0; |
e9c86c78 | 904 | #endif |
1da177e4 | 905 | |
e9c86c78 | 906 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 907 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 908 | if ((int) addr < 0) |
efd1ca52 RM |
909 | return -EIO; |
910 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 911 | (struct user_desc __user *)data); |
1da177e4 LT |
912 | break; |
913 | ||
914 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 915 | if ((int) addr < 0) |
efd1ca52 RM |
916 | return -EIO; |
917 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 918 | (struct user_desc __user *)data, 0); |
1da177e4 | 919 | break; |
e9c86c78 RM |
920 | #endif |
921 | ||
922 | #ifdef CONFIG_X86_64 | |
923 | /* normal 64bit interface to access TLS data. | |
924 | Works just like arch_prctl, except that the arguments | |
925 | are reversed. */ | |
926 | case PTRACE_ARCH_PRCTL: | |
927 | ret = do_arch_prctl(child, data, addr); | |
928 | break; | |
929 | #endif | |
1da177e4 LT |
930 | |
931 | default: | |
932 | ret = ptrace_request(child, request, addr, data); | |
933 | break; | |
934 | } | |
d9771e8c | 935 | |
1da177e4 LT |
936 | return ret; |
937 | } | |
938 | ||
cb757c41 RM |
939 | #ifdef CONFIG_IA32_EMULATION |
940 | ||
099cd6e9 RM |
941 | #include <linux/compat.h> |
942 | #include <linux/syscalls.h> | |
943 | #include <asm/ia32.h> | |
cb757c41 RM |
944 | #include <asm/user32.h> |
945 | ||
946 | #define R32(l,q) \ | |
947 | case offsetof(struct user32, regs.l): \ | |
948 | regs->q = value; break | |
949 | ||
950 | #define SEG32(rs) \ | |
951 | case offsetof(struct user32, regs.rs): \ | |
952 | return set_segment_reg(child, \ | |
953 | offsetof(struct user_regs_struct, rs), \ | |
954 | value); \ | |
955 | break | |
956 | ||
957 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
958 | { | |
959 | struct pt_regs *regs = task_pt_regs(child); | |
960 | ||
961 | switch (regno) { | |
962 | ||
963 | SEG32(cs); | |
964 | SEG32(ds); | |
965 | SEG32(es); | |
966 | SEG32(fs); | |
967 | SEG32(gs); | |
968 | SEG32(ss); | |
969 | ||
970 | R32(ebx, bx); | |
971 | R32(ecx, cx); | |
972 | R32(edx, dx); | |
973 | R32(edi, di); | |
974 | R32(esi, si); | |
975 | R32(ebp, bp); | |
976 | R32(eax, ax); | |
cb757c41 RM |
977 | R32(eip, ip); |
978 | R32(esp, sp); | |
979 | ||
40f0933d RM |
980 | case offsetof(struct user32, regs.orig_eax): |
981 | /* | |
8cb3ed13 RM |
982 | * A 32-bit debugger setting orig_eax means to restore |
983 | * the state of the task restarting a 32-bit syscall. | |
984 | * Make sure we interpret the -ERESTART* codes correctly | |
985 | * in case the task is not actually still sitting at the | |
986 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 987 | */ |
8cb3ed13 RM |
988 | regs->orig_ax = value; |
989 | if (syscall_get_nr(child, regs) >= 0) | |
990 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
991 | break; |
992 | ||
cb757c41 RM |
993 | case offsetof(struct user32, regs.eflags): |
994 | return set_flags(child, value); | |
995 | ||
996 | case offsetof(struct user32, u_debugreg[0]) ... | |
997 | offsetof(struct user32, u_debugreg[7]): | |
998 | regno -= offsetof(struct user32, u_debugreg[0]); | |
999 | return ptrace_set_debugreg(child, regno / 4, value); | |
1000 | ||
1001 | default: | |
1002 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1003 | return -EIO; | |
1004 | ||
1005 | /* | |
1006 | * Other dummy fields in the virtual user structure | |
1007 | * are ignored | |
1008 | */ | |
1009 | break; | |
1010 | } | |
1011 | return 0; | |
1012 | } | |
1013 | ||
1014 | #undef R32 | |
1015 | #undef SEG32 | |
1016 | ||
1017 | #define R32(l,q) \ | |
1018 | case offsetof(struct user32, regs.l): \ | |
1019 | *val = regs->q; break | |
1020 | ||
1021 | #define SEG32(rs) \ | |
1022 | case offsetof(struct user32, regs.rs): \ | |
1023 | *val = get_segment_reg(child, \ | |
1024 | offsetof(struct user_regs_struct, rs)); \ | |
1025 | break | |
1026 | ||
1027 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1028 | { | |
1029 | struct pt_regs *regs = task_pt_regs(child); | |
1030 | ||
1031 | switch (regno) { | |
1032 | ||
1033 | SEG32(ds); | |
1034 | SEG32(es); | |
1035 | SEG32(fs); | |
1036 | SEG32(gs); | |
1037 | ||
1038 | R32(cs, cs); | |
1039 | R32(ss, ss); | |
1040 | R32(ebx, bx); | |
1041 | R32(ecx, cx); | |
1042 | R32(edx, dx); | |
1043 | R32(edi, di); | |
1044 | R32(esi, si); | |
1045 | R32(ebp, bp); | |
1046 | R32(eax, ax); | |
1047 | R32(orig_eax, orig_ax); | |
1048 | R32(eip, ip); | |
1049 | R32(esp, sp); | |
1050 | ||
1051 | case offsetof(struct user32, regs.eflags): | |
1052 | *val = get_flags(child); | |
1053 | break; | |
1054 | ||
1055 | case offsetof(struct user32, u_debugreg[0]) ... | |
1056 | offsetof(struct user32, u_debugreg[7]): | |
1057 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1058 | *val = ptrace_get_debugreg(child, regno / 4); | |
1059 | break; | |
1060 | ||
1061 | default: | |
1062 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1063 | return -EIO; | |
1064 | ||
1065 | /* | |
1066 | * Other dummy fields in the virtual user structure | |
1067 | * are ignored | |
1068 | */ | |
1069 | *val = 0; | |
1070 | break; | |
1071 | } | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | #undef R32 | |
1076 | #undef SEG32 | |
1077 | ||
91e7b707 RM |
1078 | static int genregs32_get(struct task_struct *target, |
1079 | const struct user_regset *regset, | |
1080 | unsigned int pos, unsigned int count, | |
1081 | void *kbuf, void __user *ubuf) | |
1082 | { | |
1083 | if (kbuf) { | |
1084 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1085 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1086 | getreg32(target, pos, k++); |
1087 | count -= sizeof(*k); | |
1088 | pos += sizeof(*k); | |
1089 | } | |
1090 | } else { | |
1091 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1092 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1093 | compat_ulong_t word; |
1094 | getreg32(target, pos, &word); | |
1095 | if (__put_user(word, u++)) | |
1096 | return -EFAULT; | |
1097 | count -= sizeof(*u); | |
1098 | pos += sizeof(*u); | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static int genregs32_set(struct task_struct *target, | |
1106 | const struct user_regset *regset, | |
1107 | unsigned int pos, unsigned int count, | |
1108 | const void *kbuf, const void __user *ubuf) | |
1109 | { | |
1110 | int ret = 0; | |
1111 | if (kbuf) { | |
1112 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1113 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1114 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1115 | count -= sizeof(*k); |
1116 | pos += sizeof(*k); | |
1117 | } | |
1118 | } else { | |
1119 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1120 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1121 | compat_ulong_t word; |
1122 | ret = __get_user(word, u++); | |
1123 | if (ret) | |
1124 | break; | |
f9cb02b0 | 1125 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1126 | count -= sizeof(*u); |
1127 | pos += sizeof(*u); | |
1128 | } | |
1129 | } | |
1130 | return ret; | |
1131 | } | |
1132 | ||
562b80ba RM |
1133 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1134 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1135 | { |
562b80ba RM |
1136 | unsigned long addr = caddr; |
1137 | unsigned long data = cdata; | |
099cd6e9 RM |
1138 | void __user *datap = compat_ptr(data); |
1139 | int ret; | |
1140 | __u32 val; | |
1141 | ||
099cd6e9 | 1142 | switch (request) { |
099cd6e9 RM |
1143 | case PTRACE_PEEKUSR: |
1144 | ret = getreg32(child, addr, &val); | |
1145 | if (ret == 0) | |
1146 | ret = put_user(val, (__u32 __user *)datap); | |
1147 | break; | |
1148 | ||
1149 | case PTRACE_POKEUSR: | |
1150 | ret = putreg32(child, addr, data); | |
1151 | break; | |
1152 | ||
5a4646a4 RM |
1153 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1154 | return copy_regset_to_user(child, &user_x86_32_view, | |
1155 | REGSET_GENERAL, | |
1156 | 0, sizeof(struct user_regs_struct32), | |
1157 | datap); | |
1158 | ||
1159 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1160 | return copy_regset_from_user(child, &user_x86_32_view, | |
1161 | REGSET_GENERAL, 0, | |
1162 | sizeof(struct user_regs_struct32), | |
1163 | datap); | |
1164 | ||
1165 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1166 | return copy_regset_to_user(child, &user_x86_32_view, | |
1167 | REGSET_FP, 0, | |
1168 | sizeof(struct user_i387_ia32_struct), | |
1169 | datap); | |
1170 | ||
1171 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1172 | return copy_regset_from_user( | |
1173 | child, &user_x86_32_view, REGSET_FP, | |
1174 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1175 | ||
1176 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1177 | return copy_regset_to_user(child, &user_x86_32_view, | |
1178 | REGSET_XFP, 0, | |
1179 | sizeof(struct user32_fxsr_struct), | |
1180 | datap); | |
1181 | ||
1182 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1183 | return copy_regset_from_user(child, &user_x86_32_view, | |
1184 | REGSET_XFP, 0, | |
1185 | sizeof(struct user32_fxsr_struct), | |
1186 | datap); | |
099cd6e9 | 1187 | |
562b80ba RM |
1188 | case PTRACE_GET_THREAD_AREA: |
1189 | case PTRACE_SET_THREAD_AREA: | |
1190 | return arch_ptrace(child, request, addr, data); | |
1191 | ||
099cd6e9 | 1192 | default: |
fdadd54d | 1193 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1194 | } |
1195 | ||
099cd6e9 RM |
1196 | return ret; |
1197 | } | |
1198 | ||
cb757c41 RM |
1199 | #endif /* CONFIG_IA32_EMULATION */ |
1200 | ||
070459d9 RM |
1201 | #ifdef CONFIG_X86_64 |
1202 | ||
5b3efd50 | 1203 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1204 | [REGSET_GENERAL] = { |
1205 | .core_note_type = NT_PRSTATUS, | |
1206 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1207 | .size = sizeof(long), .align = sizeof(long), | |
1208 | .get = genregs_get, .set = genregs_set | |
1209 | }, | |
1210 | [REGSET_FP] = { | |
1211 | .core_note_type = NT_PRFPREG, | |
1212 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1213 | .size = sizeof(long), .align = sizeof(long), | |
1214 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1215 | }, | |
5b3efd50 SS |
1216 | [REGSET_XSTATE] = { |
1217 | .core_note_type = NT_X86_XSTATE, | |
1218 | .size = sizeof(u64), .align = sizeof(u64), | |
1219 | .active = xstateregs_active, .get = xstateregs_get, | |
1220 | .set = xstateregs_set | |
1221 | }, | |
325af5fb RM |
1222 | [REGSET_IOPERM64] = { |
1223 | .core_note_type = NT_386_IOPERM, | |
1224 | .n = IO_BITMAP_LONGS, | |
1225 | .size = sizeof(long), .align = sizeof(long), | |
1226 | .active = ioperm_active, .get = ioperm_get | |
1227 | }, | |
070459d9 RM |
1228 | }; |
1229 | ||
1230 | static const struct user_regset_view user_x86_64_view = { | |
1231 | .name = "x86_64", .e_machine = EM_X86_64, | |
1232 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1233 | }; | |
1234 | ||
1235 | #else /* CONFIG_X86_32 */ | |
1236 | ||
1237 | #define user_regs_struct32 user_regs_struct | |
1238 | #define genregs32_get genregs_get | |
1239 | #define genregs32_set genregs_set | |
1240 | ||
1f465f4e RM |
1241 | #define user_i387_ia32_struct user_i387_struct |
1242 | #define user32_fxsr_struct user_fxsr_struct | |
1243 | ||
070459d9 RM |
1244 | #endif /* CONFIG_X86_64 */ |
1245 | ||
1246 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1247 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1248 | [REGSET_GENERAL] = { |
1249 | .core_note_type = NT_PRSTATUS, | |
1250 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1251 | .size = sizeof(u32), .align = sizeof(u32), | |
1252 | .get = genregs32_get, .set = genregs32_set | |
1253 | }, | |
1254 | [REGSET_FP] = { | |
1255 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1256 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1257 | .size = sizeof(u32), .align = sizeof(u32), |
1258 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1259 | }, | |
1260 | [REGSET_XFP] = { | |
1261 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1262 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1263 | .size = sizeof(u32), .align = sizeof(u32), |
1264 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1265 | }, | |
5b3efd50 SS |
1266 | [REGSET_XSTATE] = { |
1267 | .core_note_type = NT_X86_XSTATE, | |
1268 | .size = sizeof(u64), .align = sizeof(u64), | |
1269 | .active = xstateregs_active, .get = xstateregs_get, | |
1270 | .set = xstateregs_set | |
1271 | }, | |
070459d9 | 1272 | [REGSET_TLS] = { |
bb61682b | 1273 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1274 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1275 | .size = sizeof(struct user_desc), | |
1276 | .align = sizeof(struct user_desc), | |
1277 | .active = regset_tls_active, | |
1278 | .get = regset_tls_get, .set = regset_tls_set | |
1279 | }, | |
325af5fb RM |
1280 | [REGSET_IOPERM32] = { |
1281 | .core_note_type = NT_386_IOPERM, | |
1282 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1283 | .size = sizeof(u32), .align = sizeof(u32), | |
1284 | .active = ioperm_active, .get = ioperm_get | |
1285 | }, | |
070459d9 RM |
1286 | }; |
1287 | ||
1288 | static const struct user_regset_view user_x86_32_view = { | |
1289 | .name = "i386", .e_machine = EM_386, | |
1290 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1291 | }; | |
1292 | #endif | |
1293 | ||
5b3efd50 SS |
1294 | /* |
1295 | * This represents bytes 464..511 in the memory layout exported through | |
1296 | * the REGSET_XSTATE interface. | |
1297 | */ | |
1298 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1299 | ||
1300 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1301 | { | |
1302 | #ifdef CONFIG_X86_64 | |
1303 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1304 | #endif | |
1305 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1306 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1307 | #endif | |
1308 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1309 | } | |
1310 | ||
070459d9 RM |
1311 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1312 | { | |
1313 | #ifdef CONFIG_IA32_EMULATION | |
1314 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1315 | #endif | |
1316 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1317 | return &user_x86_32_view; | |
1318 | #endif | |
1319 | #ifdef CONFIG_X86_64 | |
1320 | return &user_x86_64_view; | |
1321 | #endif | |
1322 | } | |
1323 | ||
7f38551f ON |
1324 | static void fill_sigtrap_info(struct task_struct *tsk, |
1325 | struct pt_regs *regs, | |
1326 | int error_code, int si_code, | |
1327 | struct siginfo *info) | |
1da177e4 | 1328 | { |
1da177e4 LT |
1329 | tsk->thread.trap_no = 1; |
1330 | tsk->thread.error_code = error_code; | |
1331 | ||
7f38551f ON |
1332 | memset(info, 0, sizeof(*info)); |
1333 | info->si_signo = SIGTRAP; | |
1334 | info->si_code = si_code; | |
1335 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1336 | } | |
1337 | ||
1338 | void user_single_step_siginfo(struct task_struct *tsk, | |
1339 | struct pt_regs *regs, | |
1340 | struct siginfo *info) | |
1341 | { | |
1342 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1343 | } | |
1da177e4 | 1344 | |
7f38551f ON |
1345 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1346 | int error_code, int si_code) | |
1347 | { | |
1348 | struct siginfo info; | |
1da177e4 | 1349 | |
7f38551f | 1350 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1351 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1352 | force_sig_info(SIGTRAP, &info, tsk); |
1353 | } | |
1354 | ||
86976cd8 | 1355 | |
d4d67150 RM |
1356 | #ifdef CONFIG_X86_32 |
1357 | # define IS_IA32 1 | |
1358 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1359 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1360 | #else |
1361 | # define IS_IA32 0 | |
1362 | #endif | |
1363 | ||
1364 | /* | |
1365 | * We must return the syscall number to actually look up in the table. | |
1366 | * This can be -1L to skip running any syscall at all. | |
1367 | */ | |
1b4ac2a9 | 1368 | long syscall_trace_enter(struct pt_regs *regs) |
86976cd8 | 1369 | { |
d4d67150 RM |
1370 | long ret = 0; |
1371 | ||
380fdd75 RM |
1372 | /* |
1373 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1374 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1375 | * If user-mode had set TF itself, then it's still clear from | |
1376 | * do_debug() and we need to set it again to restore the user | |
1377 | * state. If we entered on the slow path, TF was already set. | |
1378 | */ | |
1379 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1380 | regs->flags |= X86_EFLAGS_TF; | |
1381 | ||
86976cd8 RM |
1382 | /* do the secure computing check first */ |
1383 | secure_computing(regs->orig_ax); | |
1384 | ||
d4d67150 RM |
1385 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1386 | ret = -1L; | |
1387 | ||
eeea3c3f RM |
1388 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1389 | tracehook_report_syscall_entry(regs)) | |
1390 | ret = -1L; | |
86976cd8 | 1391 | |
66700001 | 1392 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1393 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1394 | |
b05d8447 EP |
1395 | if (IS_IA32) |
1396 | audit_syscall_entry(AUDIT_ARCH_I386, | |
1397 | regs->orig_ax, | |
1398 | regs->bx, regs->cx, | |
1399 | regs->dx, regs->si); | |
d4d67150 | 1400 | #ifdef CONFIG_X86_64 |
b05d8447 EP |
1401 | else |
1402 | audit_syscall_entry(AUDIT_ARCH_X86_64, | |
1403 | regs->orig_ax, | |
1404 | regs->di, regs->si, | |
1405 | regs->dx, regs->r10); | |
d4d67150 | 1406 | #endif |
d4d67150 RM |
1407 | |
1408 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1409 | } |
1410 | ||
1b4ac2a9 | 1411 | void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1412 | { |
d5196503 ON |
1413 | bool step; |
1414 | ||
d7e7528b | 1415 | audit_syscall_exit(regs); |
86976cd8 | 1416 | |
66700001 | 1417 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1418 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1419 | |
d4d67150 RM |
1420 | /* |
1421 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1422 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1423 | * We already reported this syscall instruction in | |
d5196503 | 1424 | * syscall_trace_enter(). |
d4d67150 | 1425 | */ |
d5196503 ON |
1426 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1427 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1428 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1429 | tracehook_report_syscall_exit(regs, step); | |
d4d67150 | 1430 | } |