Commit | Line | Data |
---|---|---|
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> | |
1361b83a | 30 | #include <asm/fpu-internal.h> |
1da177e4 LT |
31 | #include <asm/debugreg.h> |
32 | #include <asm/ldt.h> | |
33 | #include <asm/desc.h> | |
2047b08b RM |
34 | #include <asm/prctl.h> |
35 | #include <asm/proto.h> | |
72f674d2 | 36 | #include <asm/hw_breakpoint.h> |
eee3af4a | 37 | |
070459d9 RM |
38 | #include "tls.h" |
39 | ||
1c569f02 JS |
40 | #define CREATE_TRACE_POINTS |
41 | #include <trace/events/syscalls.h> | |
42 | ||
070459d9 RM |
43 | enum x86_regset { |
44 | REGSET_GENERAL, | |
45 | REGSET_FP, | |
46 | REGSET_XFP, | |
325af5fb | 47 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 48 | REGSET_XSTATE, |
070459d9 | 49 | REGSET_TLS, |
325af5fb | 50 | REGSET_IOPERM32, |
070459d9 | 51 | }; |
eee3af4a | 52 | |
b1cf540f MH |
53 | struct pt_regs_offset { |
54 | const char *name; | |
55 | int offset; | |
56 | }; | |
57 | ||
58 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
59 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
60 | ||
61 | static const struct pt_regs_offset regoffset_table[] = { | |
62 | #ifdef CONFIG_X86_64 | |
63 | REG_OFFSET_NAME(r15), | |
64 | REG_OFFSET_NAME(r14), | |
65 | REG_OFFSET_NAME(r13), | |
66 | REG_OFFSET_NAME(r12), | |
67 | REG_OFFSET_NAME(r11), | |
68 | REG_OFFSET_NAME(r10), | |
69 | REG_OFFSET_NAME(r9), | |
70 | REG_OFFSET_NAME(r8), | |
71 | #endif | |
72 | REG_OFFSET_NAME(bx), | |
73 | REG_OFFSET_NAME(cx), | |
74 | REG_OFFSET_NAME(dx), | |
75 | REG_OFFSET_NAME(si), | |
76 | REG_OFFSET_NAME(di), | |
77 | REG_OFFSET_NAME(bp), | |
78 | REG_OFFSET_NAME(ax), | |
79 | #ifdef CONFIG_X86_32 | |
80 | REG_OFFSET_NAME(ds), | |
81 | REG_OFFSET_NAME(es), | |
82 | REG_OFFSET_NAME(fs), | |
83 | REG_OFFSET_NAME(gs), | |
84 | #endif | |
85 | REG_OFFSET_NAME(orig_ax), | |
86 | REG_OFFSET_NAME(ip), | |
87 | REG_OFFSET_NAME(cs), | |
88 | REG_OFFSET_NAME(flags), | |
89 | REG_OFFSET_NAME(sp), | |
90 | REG_OFFSET_NAME(ss), | |
91 | REG_OFFSET_END, | |
92 | }; | |
93 | ||
94 | /** | |
95 | * regs_query_register_offset() - query register offset from its name | |
96 | * @name: the name of a register | |
97 | * | |
98 | * regs_query_register_offset() returns the offset of a register in struct | |
99 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
100 | */ | |
101 | int regs_query_register_offset(const char *name) | |
102 | { | |
103 | const struct pt_regs_offset *roff; | |
104 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
105 | if (!strcmp(roff->name, name)) | |
106 | return roff->offset; | |
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | /** | |
111 | * regs_query_register_name() - query register name from its offset | |
112 | * @offset: the offset of a register in struct pt_regs. | |
113 | * | |
114 | * regs_query_register_name() returns the name of a register from its | |
115 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
116 | */ | |
117 | const char *regs_query_register_name(unsigned int offset) | |
118 | { | |
119 | const struct pt_regs_offset *roff; | |
120 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
121 | if (roff->offset == offset) | |
122 | return roff->name; | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | static const int arg_offs_table[] = { | |
127 | #ifdef CONFIG_X86_32 | |
128 | [0] = offsetof(struct pt_regs, ax), | |
129 | [1] = offsetof(struct pt_regs, dx), | |
130 | [2] = offsetof(struct pt_regs, cx) | |
131 | #else /* CONFIG_X86_64 */ | |
132 | [0] = offsetof(struct pt_regs, di), | |
133 | [1] = offsetof(struct pt_regs, si), | |
134 | [2] = offsetof(struct pt_regs, dx), | |
135 | [3] = offsetof(struct pt_regs, cx), | |
136 | [4] = offsetof(struct pt_regs, r8), | |
137 | [5] = offsetof(struct pt_regs, r9) | |
138 | #endif | |
139 | }; | |
140 | ||
1da177e4 LT |
141 | /* |
142 | * does not yet catch signals sent when the child dies. | |
143 | * in exit.c or in signal.c. | |
144 | */ | |
145 | ||
9f155b98 CE |
146 | /* |
147 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 148 | */ |
e39c2891 RM |
149 | #define FLAG_MASK_32 ((unsigned long) \ |
150 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
151 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
152 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
153 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
154 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
155 | ||
2047b08b RM |
156 | /* |
157 | * Determines whether a value may be installed in a segment register. | |
158 | */ | |
159 | static inline bool invalid_selector(u16 value) | |
160 | { | |
161 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
162 | } | |
163 | ||
164 | #ifdef CONFIG_X86_32 | |
165 | ||
e39c2891 | 166 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 167 | |
4fe702c7 | 168 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 169 | { |
65ea5b03 | 170 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 171 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
172 | } |
173 | ||
06ee1b68 | 174 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 175 | { |
06ee1b68 RM |
176 | /* |
177 | * Returning the value truncates it to 16 bits. | |
178 | */ | |
179 | unsigned int retval; | |
180 | if (offset != offsetof(struct user_regs_struct, gs)) | |
181 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
182 | else { | |
06ee1b68 | 183 | if (task == current) |
d9a89a26 TH |
184 | retval = get_user_gs(task_pt_regs(task)); |
185 | else | |
186 | retval = task_user_gs(task); | |
06ee1b68 RM |
187 | } |
188 | return retval; | |
189 | } | |
190 | ||
191 | static int set_segment_reg(struct task_struct *task, | |
192 | unsigned long offset, u16 value) | |
193 | { | |
194 | /* | |
195 | * The value argument was already truncated to 16 bits. | |
196 | */ | |
2047b08b | 197 | if (invalid_selector(value)) |
06ee1b68 RM |
198 | return -EIO; |
199 | ||
c63855d0 RM |
200 | /* |
201 | * For %cs and %ss we cannot permit a null selector. | |
202 | * We can permit a bogus selector as long as it has USER_RPL. | |
203 | * Null selectors are fine for other segment registers, but | |
204 | * we will never get back to user mode with invalid %cs or %ss | |
205 | * and will take the trap in iret instead. Much code relies | |
206 | * on user_mode() to distinguish a user trap frame (which can | |
207 | * safely use invalid selectors) from a kernel trap frame. | |
208 | */ | |
209 | switch (offset) { | |
210 | case offsetof(struct user_regs_struct, cs): | |
211 | case offsetof(struct user_regs_struct, ss): | |
212 | if (unlikely(value == 0)) | |
213 | return -EIO; | |
214 | ||
215 | default: | |
06ee1b68 | 216 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
217 | break; |
218 | ||
219 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 220 | if (task == current) |
d9a89a26 TH |
221 | set_user_gs(task_pt_regs(task), value); |
222 | else | |
223 | task_user_gs(task) = value; | |
1da177e4 | 224 | } |
06ee1b68 | 225 | |
1da177e4 LT |
226 | return 0; |
227 | } | |
228 | ||
2047b08b RM |
229 | #else /* CONFIG_X86_64 */ |
230 | ||
231 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
232 | ||
233 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
234 | { | |
235 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
236 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
237 | } | |
238 | ||
239 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
240 | { | |
241 | /* | |
242 | * Returning the value truncates it to 16 bits. | |
243 | */ | |
244 | unsigned int seg; | |
245 | ||
246 | switch (offset) { | |
247 | case offsetof(struct user_regs_struct, fs): | |
248 | if (task == current) { | |
249 | /* Older gas can't assemble movq %?s,%r?? */ | |
250 | asm("movl %%fs,%0" : "=r" (seg)); | |
251 | return seg; | |
252 | } | |
253 | return task->thread.fsindex; | |
254 | case offsetof(struct user_regs_struct, gs): | |
255 | if (task == current) { | |
256 | asm("movl %%gs,%0" : "=r" (seg)); | |
257 | return seg; | |
258 | } | |
259 | return task->thread.gsindex; | |
260 | case offsetof(struct user_regs_struct, ds): | |
261 | if (task == current) { | |
262 | asm("movl %%ds,%0" : "=r" (seg)); | |
263 | return seg; | |
264 | } | |
265 | return task->thread.ds; | |
266 | case offsetof(struct user_regs_struct, es): | |
267 | if (task == current) { | |
268 | asm("movl %%es,%0" : "=r" (seg)); | |
269 | return seg; | |
270 | } | |
271 | return task->thread.es; | |
272 | ||
273 | case offsetof(struct user_regs_struct, cs): | |
274 | case offsetof(struct user_regs_struct, ss): | |
275 | break; | |
276 | } | |
277 | return *pt_regs_access(task_pt_regs(task), offset); | |
278 | } | |
279 | ||
280 | static int set_segment_reg(struct task_struct *task, | |
281 | unsigned long offset, u16 value) | |
282 | { | |
283 | /* | |
284 | * The value argument was already truncated to 16 bits. | |
285 | */ | |
286 | if (invalid_selector(value)) | |
287 | return -EIO; | |
288 | ||
289 | switch (offset) { | |
290 | case offsetof(struct user_regs_struct,fs): | |
291 | /* | |
292 | * If this is setting fs as for normal 64-bit use but | |
293 | * setting fs_base has implicitly changed it, leave it. | |
294 | */ | |
295 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
296 | task->thread.fs != 0) || | |
297 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
298 | task->thread.fs == 0)) | |
299 | break; | |
300 | task->thread.fsindex = value; | |
301 | if (task == current) | |
302 | loadsegment(fs, task->thread.fsindex); | |
303 | break; | |
304 | case offsetof(struct user_regs_struct,gs): | |
305 | /* | |
306 | * If this is setting gs as for normal 64-bit use but | |
307 | * setting gs_base has implicitly changed it, leave it. | |
308 | */ | |
309 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
310 | task->thread.gs != 0) || | |
311 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
312 | task->thread.gs == 0)) | |
313 | break; | |
314 | task->thread.gsindex = value; | |
315 | if (task == current) | |
316 | load_gs_index(task->thread.gsindex); | |
317 | break; | |
318 | case offsetof(struct user_regs_struct,ds): | |
319 | task->thread.ds = value; | |
320 | if (task == current) | |
321 | loadsegment(ds, task->thread.ds); | |
322 | break; | |
323 | case offsetof(struct user_regs_struct,es): | |
324 | task->thread.es = value; | |
325 | if (task == current) | |
326 | loadsegment(es, task->thread.es); | |
327 | break; | |
328 | ||
329 | /* | |
330 | * Can't actually change these in 64-bit mode. | |
331 | */ | |
332 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
333 | if (unlikely(value == 0)) |
334 | return -EIO; | |
2047b08b RM |
335 | #ifdef CONFIG_IA32_EMULATION |
336 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
337 | task_pt_regs(task)->cs = value; | |
2047b08b | 338 | #endif |
cb757c41 | 339 | break; |
2047b08b | 340 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
341 | if (unlikely(value == 0)) |
342 | return -EIO; | |
2047b08b RM |
343 | #ifdef CONFIG_IA32_EMULATION |
344 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
345 | task_pt_regs(task)->ss = value; | |
2047b08b | 346 | #endif |
cb757c41 | 347 | break; |
2047b08b RM |
348 | } |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
2047b08b RM |
353 | #endif /* CONFIG_X86_32 */ |
354 | ||
06ee1b68 | 355 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 356 | { |
06ee1b68 RM |
357 | unsigned long retval = task_pt_regs(task)->flags; |
358 | ||
359 | /* | |
360 | * If the debugger set TF, hide it from the readout. | |
361 | */ | |
362 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
363 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 364 | |
1da177e4 LT |
365 | return retval; |
366 | } | |
367 | ||
06ee1b68 RM |
368 | static int set_flags(struct task_struct *task, unsigned long value) |
369 | { | |
370 | struct pt_regs *regs = task_pt_regs(task); | |
371 | ||
372 | /* | |
373 | * If the user value contains TF, mark that | |
374 | * it was not "us" (the debugger) that set it. | |
375 | * If not, make sure it stays set if we had. | |
376 | */ | |
377 | if (value & X86_EFLAGS_TF) | |
378 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
379 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
380 | value |= X86_EFLAGS_TF; | |
381 | ||
382 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static int putreg(struct task_struct *child, | |
388 | unsigned long offset, unsigned long value) | |
389 | { | |
390 | switch (offset) { | |
391 | case offsetof(struct user_regs_struct, cs): | |
392 | case offsetof(struct user_regs_struct, ds): | |
393 | case offsetof(struct user_regs_struct, es): | |
394 | case offsetof(struct user_regs_struct, fs): | |
395 | case offsetof(struct user_regs_struct, gs): | |
396 | case offsetof(struct user_regs_struct, ss): | |
397 | return set_segment_reg(child, offset, value); | |
398 | ||
399 | case offsetof(struct user_regs_struct, flags): | |
400 | return set_flags(child, value); | |
2047b08b RM |
401 | |
402 | #ifdef CONFIG_X86_64 | |
403 | case offsetof(struct user_regs_struct,fs_base): | |
404 | if (value >= TASK_SIZE_OF(child)) | |
405 | return -EIO; | |
406 | /* | |
407 | * When changing the segment base, use do_arch_prctl | |
408 | * to set either thread.fs or thread.fsindex and the | |
409 | * corresponding GDT slot. | |
410 | */ | |
411 | if (child->thread.fs != value) | |
412 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
413 | return 0; | |
414 | case offsetof(struct user_regs_struct,gs_base): | |
415 | /* | |
416 | * Exactly the same here as the %fs handling above. | |
417 | */ | |
418 | if (value >= TASK_SIZE_OF(child)) | |
419 | return -EIO; | |
420 | if (child->thread.gs != value) | |
421 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
422 | return 0; | |
423 | #endif | |
06ee1b68 RM |
424 | } |
425 | ||
426 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
431 | { | |
432 | switch (offset) { | |
433 | case offsetof(struct user_regs_struct, cs): | |
434 | case offsetof(struct user_regs_struct, ds): | |
435 | case offsetof(struct user_regs_struct, es): | |
436 | case offsetof(struct user_regs_struct, fs): | |
437 | case offsetof(struct user_regs_struct, gs): | |
438 | case offsetof(struct user_regs_struct, ss): | |
439 | return get_segment_reg(task, offset); | |
440 | ||
441 | case offsetof(struct user_regs_struct, flags): | |
442 | return get_flags(task); | |
2047b08b RM |
443 | |
444 | #ifdef CONFIG_X86_64 | |
445 | case offsetof(struct user_regs_struct, fs_base): { | |
446 | /* | |
447 | * do_arch_prctl may have used a GDT slot instead of | |
448 | * the MSR. To userland, it appears the same either | |
449 | * way, except the %fs segment selector might not be 0. | |
450 | */ | |
451 | unsigned int seg = task->thread.fsindex; | |
452 | if (task->thread.fs != 0) | |
453 | return task->thread.fs; | |
454 | if (task == current) | |
455 | asm("movl %%fs,%0" : "=r" (seg)); | |
456 | if (seg != FS_TLS_SEL) | |
457 | return 0; | |
458 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
459 | } | |
460 | case offsetof(struct user_regs_struct, gs_base): { | |
461 | /* | |
462 | * Exactly the same here as the %fs handling above. | |
463 | */ | |
464 | unsigned int seg = task->thread.gsindex; | |
465 | if (task->thread.gs != 0) | |
466 | return task->thread.gs; | |
467 | if (task == current) | |
468 | asm("movl %%gs,%0" : "=r" (seg)); | |
469 | if (seg != GS_TLS_SEL) | |
470 | return 0; | |
471 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
472 | } | |
473 | #endif | |
06ee1b68 RM |
474 | } |
475 | ||
476 | return *pt_regs_access(task_pt_regs(task), offset); | |
477 | } | |
478 | ||
91e7b707 RM |
479 | static int genregs_get(struct task_struct *target, |
480 | const struct user_regset *regset, | |
481 | unsigned int pos, unsigned int count, | |
482 | void *kbuf, void __user *ubuf) | |
483 | { | |
484 | if (kbuf) { | |
485 | unsigned long *k = kbuf; | |
04a1e62c | 486 | while (count >= sizeof(*k)) { |
91e7b707 RM |
487 | *k++ = getreg(target, pos); |
488 | count -= sizeof(*k); | |
489 | pos += sizeof(*k); | |
490 | } | |
491 | } else { | |
492 | unsigned long __user *u = ubuf; | |
04a1e62c | 493 | while (count >= sizeof(*u)) { |
91e7b707 RM |
494 | if (__put_user(getreg(target, pos), u++)) |
495 | return -EFAULT; | |
496 | count -= sizeof(*u); | |
497 | pos += sizeof(*u); | |
498 | } | |
499 | } | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static int genregs_set(struct task_struct *target, | |
505 | const struct user_regset *regset, | |
506 | unsigned int pos, unsigned int count, | |
507 | const void *kbuf, const void __user *ubuf) | |
508 | { | |
509 | int ret = 0; | |
510 | if (kbuf) { | |
511 | const unsigned long *k = kbuf; | |
04a1e62c | 512 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
513 | ret = putreg(target, pos, *k++); |
514 | count -= sizeof(*k); | |
515 | pos += sizeof(*k); | |
516 | } | |
517 | } else { | |
518 | const unsigned long __user *u = ubuf; | |
04a1e62c | 519 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
520 | unsigned long word; |
521 | ret = __get_user(word, u++); | |
522 | if (ret) | |
523 | break; | |
524 | ret = putreg(target, pos, word); | |
525 | count -= sizeof(*u); | |
526 | pos += sizeof(*u); | |
527 | } | |
528 | } | |
529 | return ret; | |
530 | } | |
531 | ||
a8b0ca17 | 532 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
533 | struct perf_sample_data *data, |
534 | struct pt_regs *regs) | |
d9771e8c | 535 | { |
0f534093 | 536 | int i; |
24f1e32c | 537 | struct thread_struct *thread = &(current->thread); |
0f534093 | 538 | |
72f674d2 P |
539 | /* |
540 | * Store in the virtual DR6 register the fact that the breakpoint | |
541 | * was hit so the thread's debugger will see it. | |
542 | */ | |
24f1e32c FW |
543 | for (i = 0; i < HBP_NUM; i++) { |
544 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 545 | break; |
24f1e32c | 546 | } |
d9771e8c | 547 | |
72f674d2 P |
548 | thread->debugreg6 |= (DR_TRAP0 << i); |
549 | } | |
d9771e8c | 550 | |
d9771e8c | 551 | /* |
24f1e32c FW |
552 | * Walk through every ptrace breakpoints for this thread and |
553 | * build the dr7 value on top of their attributes. | |
554 | * | |
d9771e8c | 555 | */ |
24f1e32c | 556 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 557 | { |
24f1e32c FW |
558 | int i; |
559 | int dr7 = 0; | |
560 | struct arch_hw_breakpoint *info; | |
561 | ||
562 | for (i = 0; i < HBP_NUM; i++) { | |
563 | if (bp[i] && !bp[i]->attr.disabled) { | |
564 | info = counter_arch_bp(bp[i]); | |
565 | dr7 |= encode_dr7(i, info->len, info->type); | |
566 | } | |
0f534093 | 567 | } |
24f1e32c FW |
568 | |
569 | return dr7; | |
d9771e8c RM |
570 | } |
571 | ||
44234adc | 572 | static int |
5fa10b28 | 573 | ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
1cedae72 | 574 | struct task_struct *tsk, int disabled) |
5fa10b28 FW |
575 | { |
576 | int err; | |
577 | int gen_len, gen_type; | |
b326e956 | 578 | struct perf_event_attr attr; |
5fa10b28 FW |
579 | |
580 | /* | |
c9404c9c | 581 | * We should have at least an inactive breakpoint at this |
5fa10b28 FW |
582 | * slot. It means the user is writing dr7 without having |
583 | * written the address register first | |
584 | */ | |
585 | if (!bp) | |
44234adc | 586 | return -EINVAL; |
5fa10b28 FW |
587 | |
588 | err = arch_bp_generic_fields(len, type, &gen_len, &gen_type); | |
589 | if (err) | |
44234adc | 590 | return err; |
5fa10b28 FW |
591 | |
592 | attr = bp->attr; | |
593 | attr.bp_len = gen_len; | |
594 | attr.bp_type = gen_type; | |
1cedae72 | 595 | attr.disabled = disabled; |
5fa10b28 | 596 | |
2f0993e0 | 597 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
598 | } |
599 | ||
72f674d2 P |
600 | /* |
601 | * Handle ptrace writes to debug register 7. | |
602 | */ | |
603 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 604 | { |
72f674d2 | 605 | struct thread_struct *thread = &(tsk->thread); |
24f1e32c | 606 | unsigned long old_dr7; |
72f674d2 P |
607 | int i, orig_ret = 0, rc = 0; |
608 | int enabled, second_pass = 0; | |
609 | unsigned len, type; | |
24f1e32c | 610 | struct perf_event *bp; |
72f674d2 | 611 | |
87dc669b FW |
612 | if (ptrace_get_breakpoints(tsk) < 0) |
613 | return -ESRCH; | |
614 | ||
72f674d2 | 615 | data &= ~DR_CONTROL_RESERVED; |
24f1e32c | 616 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
72f674d2 P |
617 | restore: |
618 | /* | |
619 | * Loop through all the hardware breakpoints, making the | |
620 | * appropriate changes to each. | |
621 | */ | |
622 | for (i = 0; i < HBP_NUM; i++) { | |
623 | enabled = decode_dr7(data, i, &len, &type); | |
24f1e32c | 624 | bp = thread->ptrace_bps[i]; |
72f674d2 P |
625 | |
626 | if (!enabled) { | |
627 | if (bp) { | |
24f1e32c FW |
628 | /* |
629 | * Don't unregister the breakpoints right-away, | |
72f674d2 P |
630 | * unless all register_user_hw_breakpoint() |
631 | * requests have succeeded. This prevents | |
632 | * any window of opportunity for debug | |
633 | * register grabbing by other users. | |
634 | */ | |
635 | if (!second_pass) | |
636 | continue; | |
1cedae72 | 637 | |
44234adc | 638 | rc = ptrace_modify_breakpoint(bp, len, type, |
1cedae72 | 639 | tsk, 1); |
44234adc | 640 | if (rc) |
1cedae72 | 641 | break; |
72f674d2 P |
642 | } |
643 | continue; | |
644 | } | |
0f534093 | 645 | |
44234adc FW |
646 | rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0); |
647 | if (rc) | |
24f1e32c | 648 | break; |
72f674d2 P |
649 | } |
650 | /* | |
651 | * Make a second pass to free the remaining unused breakpoints | |
652 | * or to restore the original breakpoints if an error occurred. | |
653 | */ | |
654 | if (!second_pass) { | |
655 | second_pass = 1; | |
656 | if (rc < 0) { | |
657 | orig_ret = rc; | |
658 | data = old_dr7; | |
659 | } | |
660 | goto restore; | |
661 | } | |
87dc669b FW |
662 | |
663 | ptrace_put_breakpoints(tsk); | |
664 | ||
72f674d2 P |
665 | return ((orig_ret < 0) ? orig_ret : rc); |
666 | } | |
0f534093 | 667 | |
72f674d2 P |
668 | /* |
669 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
670 | */ | |
9d22b536 | 671 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 P |
672 | { |
673 | struct thread_struct *thread = &(tsk->thread); | |
674 | unsigned long val = 0; | |
675 | ||
24f1e32c FW |
676 | if (n < HBP_NUM) { |
677 | struct perf_event *bp; | |
87dc669b FW |
678 | |
679 | if (ptrace_get_breakpoints(tsk) < 0) | |
680 | return -ESRCH; | |
681 | ||
24f1e32c FW |
682 | bp = thread->ptrace_bps[n]; |
683 | if (!bp) | |
87dc669b FW |
684 | val = 0; |
685 | else | |
686 | val = bp->hw.info.address; | |
687 | ||
688 | ptrace_put_breakpoints(tsk); | |
24f1e32c | 689 | } else if (n == 6) { |
72f674d2 | 690 | val = thread->debugreg6; |
24f1e32c | 691 | } else if (n == 7) { |
326264a0 | 692 | val = thread->ptrace_dr7; |
24f1e32c | 693 | } |
72f674d2 P |
694 | return val; |
695 | } | |
0f534093 | 696 | |
24f1e32c FW |
697 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
698 | unsigned long addr) | |
699 | { | |
700 | struct perf_event *bp; | |
701 | struct thread_struct *t = &tsk->thread; | |
b326e956 | 702 | struct perf_event_attr attr; |
87dc669b FW |
703 | int err = 0; |
704 | ||
705 | if (ptrace_get_breakpoints(tsk) < 0) | |
706 | return -ESRCH; | |
24f1e32c FW |
707 | |
708 | if (!t->ptrace_bps[nr]) { | |
73266fc1 | 709 | ptrace_breakpoint_init(&attr); |
d9771e8c | 710 | /* |
24f1e32c FW |
711 | * Put stub len and type to register (reserve) an inactive but |
712 | * correct bp | |
d9771e8c | 713 | */ |
5fa10b28 FW |
714 | attr.bp_addr = addr; |
715 | attr.bp_len = HW_BREAKPOINT_LEN_1; | |
716 | attr.bp_type = HW_BREAKPOINT_W; | |
717 | attr.disabled = 1; | |
718 | ||
4dc0da86 AK |
719 | bp = register_user_hw_breakpoint(&attr, ptrace_triggered, |
720 | NULL, tsk); | |
44234adc FW |
721 | |
722 | /* | |
723 | * CHECKME: the previous code returned -EIO if the addr wasn't | |
724 | * a valid task virtual addr. The new one will return -EINVAL in | |
725 | * this case. | |
726 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
727 | * but -EIO looks better for ptrace, since we refuse a register | |
728 | * writing for the user. And anyway this is the previous | |
729 | * behaviour. | |
730 | */ | |
87dc669b FW |
731 | if (IS_ERR(bp)) { |
732 | err = PTR_ERR(bp); | |
733 | goto put; | |
734 | } | |
44234adc FW |
735 | |
736 | t->ptrace_bps[nr] = bp; | |
24f1e32c FW |
737 | } else { |
738 | bp = t->ptrace_bps[nr]; | |
5fa10b28 FW |
739 | |
740 | attr = bp->attr; | |
741 | attr.bp_addr = addr; | |
44234adc | 742 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 743 | } |
24f1e32c | 744 | |
87dc669b FW |
745 | put: |
746 | ptrace_put_breakpoints(tsk); | |
747 | return err; | |
d9771e8c RM |
748 | } |
749 | ||
72f674d2 P |
750 | /* |
751 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
752 | */ | |
98b8b99a HS |
753 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
754 | unsigned long val) | |
72f674d2 P |
755 | { |
756 | struct thread_struct *thread = &(tsk->thread); | |
757 | int rc = 0; | |
758 | ||
759 | /* There are no DR4 or DR5 registers */ | |
760 | if (n == 4 || n == 5) | |
761 | return -EIO; | |
762 | ||
763 | if (n == 6) { | |
24f1e32c | 764 | thread->debugreg6 = val; |
72f674d2 | 765 | goto ret_path; |
d9771e8c | 766 | } |
72f674d2 | 767 | if (n < HBP_NUM) { |
24f1e32c FW |
768 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
769 | if (rc) | |
770 | return rc; | |
72f674d2 P |
771 | } |
772 | /* All that's left is DR7 */ | |
326264a0 | 773 | if (n == 7) { |
72f674d2 | 774 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
775 | if (!rc) |
776 | thread->ptrace_dr7 = val; | |
777 | } | |
d9771e8c | 778 | |
72f674d2 P |
779 | ret_path: |
780 | return rc; | |
d9771e8c RM |
781 | } |
782 | ||
325af5fb RM |
783 | /* |
784 | * These access the current or another (stopped) task's io permission | |
785 | * bitmap for debugging or core dump. | |
786 | */ | |
787 | static int ioperm_active(struct task_struct *target, | |
788 | const struct user_regset *regset) | |
789 | { | |
790 | return target->thread.io_bitmap_max / regset->size; | |
791 | } | |
b4ef95de | 792 | |
325af5fb RM |
793 | static int ioperm_get(struct task_struct *target, |
794 | const struct user_regset *regset, | |
795 | unsigned int pos, unsigned int count, | |
796 | void *kbuf, void __user *ubuf) | |
eee3af4a | 797 | { |
325af5fb | 798 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
799 | return -ENXIO; |
800 | ||
325af5fb RM |
801 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
802 | target->thread.io_bitmap_ptr, | |
803 | 0, IO_BITMAP_BYTES); | |
804 | } | |
805 | ||
1da177e4 LT |
806 | /* |
807 | * Called by kernel/ptrace.c when detaching.. | |
808 | * | |
809 | * Make sure the single step bit is not set. | |
810 | */ | |
811 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 812 | { |
7f232343 | 813 | user_disable_single_step(child); |
e9c86c78 | 814 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 815 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 816 | #endif |
1da177e4 LT |
817 | } |
818 | ||
5a4646a4 RM |
819 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
820 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
821 | #endif | |
822 | ||
9b05a69e NK |
823 | long arch_ptrace(struct task_struct *child, long request, |
824 | unsigned long addr, unsigned long data) | |
1da177e4 | 825 | { |
5a4646a4 | 826 | int ret; |
1da177e4 LT |
827 | unsigned long __user *datap = (unsigned long __user *)data; |
828 | ||
1da177e4 | 829 | switch (request) { |
1da177e4 LT |
830 | /* read the word at location addr in the USER area. */ |
831 | case PTRACE_PEEKUSR: { | |
832 | unsigned long tmp; | |
833 | ||
834 | ret = -EIO; | |
eb5a3699 | 835 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
836 | break; |
837 | ||
838 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 839 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 840 | tmp = getreg(child, addr); |
e9c86c78 RM |
841 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
842 | addr <= offsetof(struct user, u_debugreg[7])) { | |
843 | addr -= offsetof(struct user, u_debugreg[0]); | |
844 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
845 | } |
846 | ret = put_user(tmp, datap); | |
847 | break; | |
848 | } | |
849 | ||
1da177e4 LT |
850 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
851 | ret = -EIO; | |
eb5a3699 | 852 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
853 | break; |
854 | ||
e9c86c78 | 855 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 856 | ret = putreg(child, addr, data); |
e9c86c78 RM |
857 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
858 | addr <= offsetof(struct user, u_debugreg[7])) { | |
859 | addr -= offsetof(struct user, u_debugreg[0]); | |
860 | ret = ptrace_set_debugreg(child, | |
861 | addr / sizeof(data), data); | |
1da177e4 | 862 | } |
e9c86c78 | 863 | break; |
1da177e4 | 864 | |
5a4646a4 RM |
865 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
866 | return copy_regset_to_user(child, | |
867 | task_user_regset_view(current), | |
868 | REGSET_GENERAL, | |
869 | 0, sizeof(struct user_regs_struct), | |
870 | datap); | |
871 | ||
872 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
873 | return copy_regset_from_user(child, | |
874 | task_user_regset_view(current), | |
875 | REGSET_GENERAL, | |
876 | 0, sizeof(struct user_regs_struct), | |
877 | datap); | |
878 | ||
879 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
880 | return copy_regset_to_user(child, | |
881 | task_user_regset_view(current), | |
882 | REGSET_FP, | |
883 | 0, sizeof(struct user_i387_struct), | |
884 | datap); | |
885 | ||
886 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
887 | return copy_regset_from_user(child, | |
888 | task_user_regset_view(current), | |
889 | REGSET_FP, | |
890 | 0, sizeof(struct user_i387_struct), | |
891 | datap); | |
1da177e4 | 892 | |
e9c86c78 | 893 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
894 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
895 | return copy_regset_to_user(child, &user_x86_32_view, | |
896 | REGSET_XFP, | |
897 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 898 | datap) ? -EIO : 0; |
5a4646a4 RM |
899 | |
900 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
901 | return copy_regset_from_user(child, &user_x86_32_view, | |
902 | REGSET_XFP, | |
903 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 904 | datap) ? -EIO : 0; |
e9c86c78 | 905 | #endif |
1da177e4 | 906 | |
e9c86c78 | 907 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 908 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 909 | if ((int) addr < 0) |
efd1ca52 RM |
910 | return -EIO; |
911 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 912 | (struct user_desc __user *)data); |
1da177e4 LT |
913 | break; |
914 | ||
915 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 916 | if ((int) addr < 0) |
efd1ca52 RM |
917 | return -EIO; |
918 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 919 | (struct user_desc __user *)data, 0); |
1da177e4 | 920 | break; |
e9c86c78 RM |
921 | #endif |
922 | ||
923 | #ifdef CONFIG_X86_64 | |
924 | /* normal 64bit interface to access TLS data. | |
925 | Works just like arch_prctl, except that the arguments | |
926 | are reversed. */ | |
927 | case PTRACE_ARCH_PRCTL: | |
928 | ret = do_arch_prctl(child, data, addr); | |
929 | break; | |
930 | #endif | |
1da177e4 LT |
931 | |
932 | default: | |
933 | ret = ptrace_request(child, request, addr, data); | |
934 | break; | |
935 | } | |
d9771e8c | 936 | |
1da177e4 LT |
937 | return ret; |
938 | } | |
939 | ||
cb757c41 RM |
940 | #ifdef CONFIG_IA32_EMULATION |
941 | ||
099cd6e9 RM |
942 | #include <linux/compat.h> |
943 | #include <linux/syscalls.h> | |
944 | #include <asm/ia32.h> | |
cb757c41 RM |
945 | #include <asm/user32.h> |
946 | ||
947 | #define R32(l,q) \ | |
948 | case offsetof(struct user32, regs.l): \ | |
949 | regs->q = value; break | |
950 | ||
951 | #define SEG32(rs) \ | |
952 | case offsetof(struct user32, regs.rs): \ | |
953 | return set_segment_reg(child, \ | |
954 | offsetof(struct user_regs_struct, rs), \ | |
955 | value); \ | |
956 | break | |
957 | ||
958 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
959 | { | |
960 | struct pt_regs *regs = task_pt_regs(child); | |
961 | ||
962 | switch (regno) { | |
963 | ||
964 | SEG32(cs); | |
965 | SEG32(ds); | |
966 | SEG32(es); | |
967 | SEG32(fs); | |
968 | SEG32(gs); | |
969 | SEG32(ss); | |
970 | ||
971 | R32(ebx, bx); | |
972 | R32(ecx, cx); | |
973 | R32(edx, dx); | |
974 | R32(edi, di); | |
975 | R32(esi, si); | |
976 | R32(ebp, bp); | |
977 | R32(eax, ax); | |
cb757c41 RM |
978 | R32(eip, ip); |
979 | R32(esp, sp); | |
980 | ||
40f0933d RM |
981 | case offsetof(struct user32, regs.orig_eax): |
982 | /* | |
8cb3ed13 RM |
983 | * A 32-bit debugger setting orig_eax means to restore |
984 | * the state of the task restarting a 32-bit syscall. | |
985 | * Make sure we interpret the -ERESTART* codes correctly | |
986 | * in case the task is not actually still sitting at the | |
987 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 988 | */ |
8cb3ed13 RM |
989 | regs->orig_ax = value; |
990 | if (syscall_get_nr(child, regs) >= 0) | |
991 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
992 | break; |
993 | ||
cb757c41 RM |
994 | case offsetof(struct user32, regs.eflags): |
995 | return set_flags(child, value); | |
996 | ||
997 | case offsetof(struct user32, u_debugreg[0]) ... | |
998 | offsetof(struct user32, u_debugreg[7]): | |
999 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1000 | return ptrace_set_debugreg(child, regno / 4, value); | |
1001 | ||
1002 | default: | |
1003 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1004 | return -EIO; | |
1005 | ||
1006 | /* | |
1007 | * Other dummy fields in the virtual user structure | |
1008 | * are ignored | |
1009 | */ | |
1010 | break; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | #undef R32 | |
1016 | #undef SEG32 | |
1017 | ||
1018 | #define R32(l,q) \ | |
1019 | case offsetof(struct user32, regs.l): \ | |
1020 | *val = regs->q; break | |
1021 | ||
1022 | #define SEG32(rs) \ | |
1023 | case offsetof(struct user32, regs.rs): \ | |
1024 | *val = get_segment_reg(child, \ | |
1025 | offsetof(struct user_regs_struct, rs)); \ | |
1026 | break | |
1027 | ||
1028 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1029 | { | |
1030 | struct pt_regs *regs = task_pt_regs(child); | |
1031 | ||
1032 | switch (regno) { | |
1033 | ||
1034 | SEG32(ds); | |
1035 | SEG32(es); | |
1036 | SEG32(fs); | |
1037 | SEG32(gs); | |
1038 | ||
1039 | R32(cs, cs); | |
1040 | R32(ss, ss); | |
1041 | R32(ebx, bx); | |
1042 | R32(ecx, cx); | |
1043 | R32(edx, dx); | |
1044 | R32(edi, di); | |
1045 | R32(esi, si); | |
1046 | R32(ebp, bp); | |
1047 | R32(eax, ax); | |
1048 | R32(orig_eax, orig_ax); | |
1049 | R32(eip, ip); | |
1050 | R32(esp, sp); | |
1051 | ||
1052 | case offsetof(struct user32, regs.eflags): | |
1053 | *val = get_flags(child); | |
1054 | break; | |
1055 | ||
1056 | case offsetof(struct user32, u_debugreg[0]) ... | |
1057 | offsetof(struct user32, u_debugreg[7]): | |
1058 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1059 | *val = ptrace_get_debugreg(child, regno / 4); | |
1060 | break; | |
1061 | ||
1062 | default: | |
1063 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1064 | return -EIO; | |
1065 | ||
1066 | /* | |
1067 | * Other dummy fields in the virtual user structure | |
1068 | * are ignored | |
1069 | */ | |
1070 | *val = 0; | |
1071 | break; | |
1072 | } | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | #undef R32 | |
1077 | #undef SEG32 | |
1078 | ||
91e7b707 RM |
1079 | static int genregs32_get(struct task_struct *target, |
1080 | const struct user_regset *regset, | |
1081 | unsigned int pos, unsigned int count, | |
1082 | void *kbuf, void __user *ubuf) | |
1083 | { | |
1084 | if (kbuf) { | |
1085 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1086 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1087 | getreg32(target, pos, k++); |
1088 | count -= sizeof(*k); | |
1089 | pos += sizeof(*k); | |
1090 | } | |
1091 | } else { | |
1092 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1093 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1094 | compat_ulong_t word; |
1095 | getreg32(target, pos, &word); | |
1096 | if (__put_user(word, u++)) | |
1097 | return -EFAULT; | |
1098 | count -= sizeof(*u); | |
1099 | pos += sizeof(*u); | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static int genregs32_set(struct task_struct *target, | |
1107 | const struct user_regset *regset, | |
1108 | unsigned int pos, unsigned int count, | |
1109 | const void *kbuf, const void __user *ubuf) | |
1110 | { | |
1111 | int ret = 0; | |
1112 | if (kbuf) { | |
1113 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1114 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1115 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1116 | count -= sizeof(*k); |
1117 | pos += sizeof(*k); | |
1118 | } | |
1119 | } else { | |
1120 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1121 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1122 | compat_ulong_t word; |
1123 | ret = __get_user(word, u++); | |
1124 | if (ret) | |
1125 | break; | |
f9cb02b0 | 1126 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1127 | count -= sizeof(*u); |
1128 | pos += sizeof(*u); | |
1129 | } | |
1130 | } | |
1131 | return ret; | |
1132 | } | |
1133 | ||
562b80ba RM |
1134 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1135 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1136 | { |
562b80ba RM |
1137 | unsigned long addr = caddr; |
1138 | unsigned long data = cdata; | |
099cd6e9 RM |
1139 | void __user *datap = compat_ptr(data); |
1140 | int ret; | |
1141 | __u32 val; | |
1142 | ||
099cd6e9 | 1143 | switch (request) { |
099cd6e9 RM |
1144 | case PTRACE_PEEKUSR: |
1145 | ret = getreg32(child, addr, &val); | |
1146 | if (ret == 0) | |
1147 | ret = put_user(val, (__u32 __user *)datap); | |
1148 | break; | |
1149 | ||
1150 | case PTRACE_POKEUSR: | |
1151 | ret = putreg32(child, addr, data); | |
1152 | break; | |
1153 | ||
5a4646a4 RM |
1154 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1155 | return copy_regset_to_user(child, &user_x86_32_view, | |
1156 | REGSET_GENERAL, | |
1157 | 0, sizeof(struct user_regs_struct32), | |
1158 | datap); | |
1159 | ||
1160 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1161 | return copy_regset_from_user(child, &user_x86_32_view, | |
1162 | REGSET_GENERAL, 0, | |
1163 | sizeof(struct user_regs_struct32), | |
1164 | datap); | |
1165 | ||
1166 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1167 | return copy_regset_to_user(child, &user_x86_32_view, | |
1168 | REGSET_FP, 0, | |
1169 | sizeof(struct user_i387_ia32_struct), | |
1170 | datap); | |
1171 | ||
1172 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1173 | return copy_regset_from_user( | |
1174 | child, &user_x86_32_view, REGSET_FP, | |
1175 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1176 | ||
1177 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1178 | return copy_regset_to_user(child, &user_x86_32_view, | |
1179 | REGSET_XFP, 0, | |
1180 | sizeof(struct user32_fxsr_struct), | |
1181 | datap); | |
1182 | ||
1183 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1184 | return copy_regset_from_user(child, &user_x86_32_view, | |
1185 | REGSET_XFP, 0, | |
1186 | sizeof(struct user32_fxsr_struct), | |
1187 | datap); | |
099cd6e9 | 1188 | |
562b80ba RM |
1189 | case PTRACE_GET_THREAD_AREA: |
1190 | case PTRACE_SET_THREAD_AREA: | |
1191 | return arch_ptrace(child, request, addr, data); | |
1192 | ||
099cd6e9 | 1193 | default: |
fdadd54d | 1194 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1195 | } |
1196 | ||
099cd6e9 RM |
1197 | return ret; |
1198 | } | |
1199 | ||
cb757c41 RM |
1200 | #endif /* CONFIG_IA32_EMULATION */ |
1201 | ||
070459d9 RM |
1202 | #ifdef CONFIG_X86_64 |
1203 | ||
5b3efd50 | 1204 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1205 | [REGSET_GENERAL] = { |
1206 | .core_note_type = NT_PRSTATUS, | |
1207 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1208 | .size = sizeof(long), .align = sizeof(long), | |
1209 | .get = genregs_get, .set = genregs_set | |
1210 | }, | |
1211 | [REGSET_FP] = { | |
1212 | .core_note_type = NT_PRFPREG, | |
1213 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1214 | .size = sizeof(long), .align = sizeof(long), | |
1215 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1216 | }, | |
5b3efd50 SS |
1217 | [REGSET_XSTATE] = { |
1218 | .core_note_type = NT_X86_XSTATE, | |
1219 | .size = sizeof(u64), .align = sizeof(u64), | |
1220 | .active = xstateregs_active, .get = xstateregs_get, | |
1221 | .set = xstateregs_set | |
1222 | }, | |
325af5fb RM |
1223 | [REGSET_IOPERM64] = { |
1224 | .core_note_type = NT_386_IOPERM, | |
1225 | .n = IO_BITMAP_LONGS, | |
1226 | .size = sizeof(long), .align = sizeof(long), | |
1227 | .active = ioperm_active, .get = ioperm_get | |
1228 | }, | |
070459d9 RM |
1229 | }; |
1230 | ||
1231 | static const struct user_regset_view user_x86_64_view = { | |
1232 | .name = "x86_64", .e_machine = EM_X86_64, | |
1233 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1234 | }; | |
1235 | ||
1236 | #else /* CONFIG_X86_32 */ | |
1237 | ||
1238 | #define user_regs_struct32 user_regs_struct | |
1239 | #define genregs32_get genregs_get | |
1240 | #define genregs32_set genregs_set | |
1241 | ||
1f465f4e RM |
1242 | #define user_i387_ia32_struct user_i387_struct |
1243 | #define user32_fxsr_struct user_fxsr_struct | |
1244 | ||
070459d9 RM |
1245 | #endif /* CONFIG_X86_64 */ |
1246 | ||
1247 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1248 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1249 | [REGSET_GENERAL] = { |
1250 | .core_note_type = NT_PRSTATUS, | |
1251 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1252 | .size = sizeof(u32), .align = sizeof(u32), | |
1253 | .get = genregs32_get, .set = genregs32_set | |
1254 | }, | |
1255 | [REGSET_FP] = { | |
1256 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1257 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1258 | .size = sizeof(u32), .align = sizeof(u32), |
1259 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1260 | }, | |
1261 | [REGSET_XFP] = { | |
1262 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1263 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1264 | .size = sizeof(u32), .align = sizeof(u32), |
1265 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1266 | }, | |
5b3efd50 SS |
1267 | [REGSET_XSTATE] = { |
1268 | .core_note_type = NT_X86_XSTATE, | |
1269 | .size = sizeof(u64), .align = sizeof(u64), | |
1270 | .active = xstateregs_active, .get = xstateregs_get, | |
1271 | .set = xstateregs_set | |
1272 | }, | |
070459d9 | 1273 | [REGSET_TLS] = { |
bb61682b | 1274 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1275 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1276 | .size = sizeof(struct user_desc), | |
1277 | .align = sizeof(struct user_desc), | |
1278 | .active = regset_tls_active, | |
1279 | .get = regset_tls_get, .set = regset_tls_set | |
1280 | }, | |
325af5fb RM |
1281 | [REGSET_IOPERM32] = { |
1282 | .core_note_type = NT_386_IOPERM, | |
1283 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1284 | .size = sizeof(u32), .align = sizeof(u32), | |
1285 | .active = ioperm_active, .get = ioperm_get | |
1286 | }, | |
070459d9 RM |
1287 | }; |
1288 | ||
1289 | static const struct user_regset_view user_x86_32_view = { | |
1290 | .name = "i386", .e_machine = EM_386, | |
1291 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1292 | }; | |
1293 | #endif | |
1294 | ||
5b3efd50 SS |
1295 | /* |
1296 | * This represents bytes 464..511 in the memory layout exported through | |
1297 | * the REGSET_XSTATE interface. | |
1298 | */ | |
1299 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1300 | ||
1301 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1302 | { | |
1303 | #ifdef CONFIG_X86_64 | |
1304 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1305 | #endif | |
1306 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1307 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1308 | #endif | |
1309 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1310 | } | |
1311 | ||
070459d9 RM |
1312 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1313 | { | |
1314 | #ifdef CONFIG_IA32_EMULATION | |
1315 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1316 | #endif | |
1317 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1318 | return &user_x86_32_view; | |
1319 | #endif | |
1320 | #ifdef CONFIG_X86_64 | |
1321 | return &user_x86_64_view; | |
1322 | #endif | |
1323 | } | |
1324 | ||
7f38551f ON |
1325 | static void fill_sigtrap_info(struct task_struct *tsk, |
1326 | struct pt_regs *regs, | |
1327 | int error_code, int si_code, | |
1328 | struct siginfo *info) | |
1da177e4 | 1329 | { |
1da177e4 LT |
1330 | tsk->thread.trap_no = 1; |
1331 | tsk->thread.error_code = error_code; | |
1332 | ||
7f38551f ON |
1333 | memset(info, 0, sizeof(*info)); |
1334 | info->si_signo = SIGTRAP; | |
1335 | info->si_code = si_code; | |
1336 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1337 | } | |
1338 | ||
1339 | void user_single_step_siginfo(struct task_struct *tsk, | |
1340 | struct pt_regs *regs, | |
1341 | struct siginfo *info) | |
1342 | { | |
1343 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1344 | } | |
1da177e4 | 1345 | |
7f38551f ON |
1346 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1347 | int error_code, int si_code) | |
1348 | { | |
1349 | struct siginfo info; | |
1da177e4 | 1350 | |
7f38551f | 1351 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1352 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1353 | force_sig_info(SIGTRAP, &info, tsk); |
1354 | } | |
1355 | ||
86976cd8 | 1356 | |
d4d67150 RM |
1357 | #ifdef CONFIG_X86_32 |
1358 | # define IS_IA32 1 | |
1359 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1360 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1361 | #else |
1362 | # define IS_IA32 0 | |
1363 | #endif | |
1364 | ||
1365 | /* | |
1366 | * We must return the syscall number to actually look up in the table. | |
1367 | * This can be -1L to skip running any syscall at all. | |
1368 | */ | |
1b4ac2a9 | 1369 | long syscall_trace_enter(struct pt_regs *regs) |
86976cd8 | 1370 | { |
d4d67150 RM |
1371 | long ret = 0; |
1372 | ||
380fdd75 RM |
1373 | /* |
1374 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1375 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1376 | * If user-mode had set TF itself, then it's still clear from | |
1377 | * do_debug() and we need to set it again to restore the user | |
1378 | * state. If we entered on the slow path, TF was already set. | |
1379 | */ | |
1380 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1381 | regs->flags |= X86_EFLAGS_TF; | |
1382 | ||
86976cd8 RM |
1383 | /* do the secure computing check first */ |
1384 | secure_computing(regs->orig_ax); | |
1385 | ||
d4d67150 RM |
1386 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1387 | ret = -1L; | |
1388 | ||
eeea3c3f RM |
1389 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1390 | tracehook_report_syscall_entry(regs)) | |
1391 | ret = -1L; | |
86976cd8 | 1392 | |
66700001 | 1393 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1394 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1395 | |
b05d8447 EP |
1396 | if (IS_IA32) |
1397 | audit_syscall_entry(AUDIT_ARCH_I386, | |
1398 | regs->orig_ax, | |
1399 | regs->bx, regs->cx, | |
1400 | regs->dx, regs->si); | |
d4d67150 | 1401 | #ifdef CONFIG_X86_64 |
b05d8447 EP |
1402 | else |
1403 | audit_syscall_entry(AUDIT_ARCH_X86_64, | |
1404 | regs->orig_ax, | |
1405 | regs->di, regs->si, | |
1406 | regs->dx, regs->r10); | |
d4d67150 | 1407 | #endif |
d4d67150 RM |
1408 | |
1409 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1410 | } |
1411 | ||
1b4ac2a9 | 1412 | void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1413 | { |
d5196503 ON |
1414 | bool step; |
1415 | ||
d7e7528b | 1416 | audit_syscall_exit(regs); |
86976cd8 | 1417 | |
66700001 | 1418 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1419 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1420 | |
d4d67150 RM |
1421 | /* |
1422 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1423 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1424 | * We already reported this syscall instruction in | |
d5196503 | 1425 | * syscall_trace_enter(). |
d4d67150 | 1426 | */ |
d5196503 ON |
1427 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1428 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1429 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1430 | tracehook_report_syscall_exit(regs, step); | |
d4d67150 | 1431 | } |