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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> |
eeea3c3f | 14 | #include <linux/tracehook.h> |
1da177e4 | 15 | #include <linux/user.h> |
070459d9 | 16 | #include <linux/elf.h> |
1da177e4 LT |
17 | #include <linux/security.h> |
18 | #include <linux/audit.h> | |
19 | #include <linux/seccomp.h> | |
7ed20e1a | 20 | #include <linux/signal.h> |
24f1e32c FW |
21 | #include <linux/perf_event.h> |
22 | #include <linux/hw_breakpoint.h> | |
bf5a3c13 | 23 | #include <linux/rcupdate.h> |
19348e74 | 24 | #include <linux/export.h> |
91d1aa43 | 25 | #include <linux/context_tracking.h> |
1da177e4 LT |
26 | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/pgtable.h> | |
1da177e4 | 29 | #include <asm/processor.h> |
78f7f1e5 | 30 | #include <asm/fpu/internal.h> |
fcbc99c4 | 31 | #include <asm/fpu/signal.h> |
59a36d16 | 32 | #include <asm/fpu/regset.h> |
1da177e4 LT |
33 | #include <asm/debugreg.h> |
34 | #include <asm/ldt.h> | |
35 | #include <asm/desc.h> | |
2047b08b RM |
36 | #include <asm/prctl.h> |
37 | #include <asm/proto.h> | |
72f674d2 | 38 | #include <asm/hw_breakpoint.h> |
51e7dc70 | 39 | #include <asm/traps.h> |
1f484aa6 | 40 | #include <asm/syscall.h> |
eee3af4a | 41 | |
070459d9 RM |
42 | #include "tls.h" |
43 | ||
44 | enum x86_regset { | |
45 | REGSET_GENERAL, | |
46 | REGSET_FP, | |
47 | REGSET_XFP, | |
325af5fb | 48 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 49 | REGSET_XSTATE, |
070459d9 | 50 | REGSET_TLS, |
325af5fb | 51 | REGSET_IOPERM32, |
070459d9 | 52 | }; |
eee3af4a | 53 | |
b1cf540f MH |
54 | struct pt_regs_offset { |
55 | const char *name; | |
56 | int offset; | |
57 | }; | |
58 | ||
59 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
60 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
61 | ||
62 | static const struct pt_regs_offset regoffset_table[] = { | |
63 | #ifdef CONFIG_X86_64 | |
64 | REG_OFFSET_NAME(r15), | |
65 | REG_OFFSET_NAME(r14), | |
66 | REG_OFFSET_NAME(r13), | |
67 | REG_OFFSET_NAME(r12), | |
68 | REG_OFFSET_NAME(r11), | |
69 | REG_OFFSET_NAME(r10), | |
70 | REG_OFFSET_NAME(r9), | |
71 | REG_OFFSET_NAME(r8), | |
72 | #endif | |
73 | REG_OFFSET_NAME(bx), | |
74 | REG_OFFSET_NAME(cx), | |
75 | REG_OFFSET_NAME(dx), | |
76 | REG_OFFSET_NAME(si), | |
77 | REG_OFFSET_NAME(di), | |
78 | REG_OFFSET_NAME(bp), | |
79 | REG_OFFSET_NAME(ax), | |
80 | #ifdef CONFIG_X86_32 | |
81 | REG_OFFSET_NAME(ds), | |
82 | REG_OFFSET_NAME(es), | |
83 | REG_OFFSET_NAME(fs), | |
84 | REG_OFFSET_NAME(gs), | |
85 | #endif | |
86 | REG_OFFSET_NAME(orig_ax), | |
87 | REG_OFFSET_NAME(ip), | |
88 | REG_OFFSET_NAME(cs), | |
89 | REG_OFFSET_NAME(flags), | |
90 | REG_OFFSET_NAME(sp), | |
91 | REG_OFFSET_NAME(ss), | |
92 | REG_OFFSET_END, | |
93 | }; | |
94 | ||
95 | /** | |
96 | * regs_query_register_offset() - query register offset from its name | |
97 | * @name: the name of a register | |
98 | * | |
99 | * regs_query_register_offset() returns the offset of a register in struct | |
100 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
101 | */ | |
102 | int regs_query_register_offset(const char *name) | |
103 | { | |
104 | const struct pt_regs_offset *roff; | |
105 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
106 | if (!strcmp(roff->name, name)) | |
107 | return roff->offset; | |
108 | return -EINVAL; | |
109 | } | |
110 | ||
111 | /** | |
112 | * regs_query_register_name() - query register name from its offset | |
113 | * @offset: the offset of a register in struct pt_regs. | |
114 | * | |
115 | * regs_query_register_name() returns the name of a register from its | |
116 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
117 | */ | |
118 | const char *regs_query_register_name(unsigned int offset) | |
119 | { | |
120 | const struct pt_regs_offset *roff; | |
121 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
122 | if (roff->offset == offset) | |
123 | return roff->name; | |
124 | return NULL; | |
125 | } | |
126 | ||
1da177e4 LT |
127 | /* |
128 | * does not yet catch signals sent when the child dies. | |
129 | * in exit.c or in signal.c. | |
130 | */ | |
131 | ||
9f155b98 CE |
132 | /* |
133 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 134 | */ |
e39c2891 RM |
135 | #define FLAG_MASK_32 ((unsigned long) \ |
136 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
137 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
138 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
139 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
140 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
141 | ||
2047b08b RM |
142 | /* |
143 | * Determines whether a value may be installed in a segment register. | |
144 | */ | |
145 | static inline bool invalid_selector(u16 value) | |
146 | { | |
147 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_X86_32 | |
151 | ||
e39c2891 | 152 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 153 | |
10226238 RR |
154 | /* |
155 | * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode | |
156 | * when it traps. The previous stack will be directly underneath the saved | |
157 | * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. | |
158 | * | |
159 | * Now, if the stack is empty, '®s->sp' is out of range. In this | |
160 | * case we try to take the previous stack. To always return a non-null | |
161 | * stack pointer we fall back to regs as stack if no previous stack | |
162 | * exists. | |
163 | * | |
164 | * This is valid only for kernel mode traps. | |
165 | */ | |
166 | unsigned long kernel_stack_pointer(struct pt_regs *regs) | |
167 | { | |
168 | unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1); | |
169 | unsigned long sp = (unsigned long)®s->sp; | |
0788aa6a | 170 | u32 *prev_esp; |
10226238 RR |
171 | |
172 | if (context == (sp & ~(THREAD_SIZE - 1))) | |
173 | return sp; | |
174 | ||
198d208d | 175 | prev_esp = (u32 *)(context); |
0788aa6a SR |
176 | if (prev_esp) |
177 | return (unsigned long)prev_esp; | |
10226238 RR |
178 | |
179 | return (unsigned long)regs; | |
180 | } | |
cb57a2b4 | 181 | EXPORT_SYMBOL_GPL(kernel_stack_pointer); |
10226238 | 182 | |
4fe702c7 | 183 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 184 | { |
65ea5b03 | 185 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 186 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
187 | } |
188 | ||
06ee1b68 | 189 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 190 | { |
06ee1b68 RM |
191 | /* |
192 | * Returning the value truncates it to 16 bits. | |
193 | */ | |
194 | unsigned int retval; | |
195 | if (offset != offsetof(struct user_regs_struct, gs)) | |
196 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
197 | else { | |
06ee1b68 | 198 | if (task == current) |
d9a89a26 TH |
199 | retval = get_user_gs(task_pt_regs(task)); |
200 | else | |
201 | retval = task_user_gs(task); | |
06ee1b68 RM |
202 | } |
203 | return retval; | |
204 | } | |
205 | ||
206 | static int set_segment_reg(struct task_struct *task, | |
207 | unsigned long offset, u16 value) | |
208 | { | |
209 | /* | |
210 | * The value argument was already truncated to 16 bits. | |
211 | */ | |
2047b08b | 212 | if (invalid_selector(value)) |
06ee1b68 RM |
213 | return -EIO; |
214 | ||
c63855d0 RM |
215 | /* |
216 | * For %cs and %ss we cannot permit a null selector. | |
217 | * We can permit a bogus selector as long as it has USER_RPL. | |
218 | * Null selectors are fine for other segment registers, but | |
219 | * we will never get back to user mode with invalid %cs or %ss | |
220 | * and will take the trap in iret instead. Much code relies | |
221 | * on user_mode() to distinguish a user trap frame (which can | |
222 | * safely use invalid selectors) from a kernel trap frame. | |
223 | */ | |
224 | switch (offset) { | |
225 | case offsetof(struct user_regs_struct, cs): | |
226 | case offsetof(struct user_regs_struct, ss): | |
227 | if (unlikely(value == 0)) | |
228 | return -EIO; | |
229 | ||
230 | default: | |
06ee1b68 | 231 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
232 | break; |
233 | ||
234 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 235 | if (task == current) |
d9a89a26 TH |
236 | set_user_gs(task_pt_regs(task), value); |
237 | else | |
238 | task_user_gs(task) = value; | |
1da177e4 | 239 | } |
06ee1b68 | 240 | |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | ||
2047b08b RM |
244 | #else /* CONFIG_X86_64 */ |
245 | ||
246 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
247 | ||
248 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
249 | { | |
250 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
251 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
252 | } | |
253 | ||
254 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
255 | { | |
256 | /* | |
257 | * Returning the value truncates it to 16 bits. | |
258 | */ | |
259 | unsigned int seg; | |
260 | ||
261 | switch (offset) { | |
262 | case offsetof(struct user_regs_struct, fs): | |
263 | if (task == current) { | |
264 | /* Older gas can't assemble movq %?s,%r?? */ | |
265 | asm("movl %%fs,%0" : "=r" (seg)); | |
266 | return seg; | |
267 | } | |
268 | return task->thread.fsindex; | |
269 | case offsetof(struct user_regs_struct, gs): | |
270 | if (task == current) { | |
271 | asm("movl %%gs,%0" : "=r" (seg)); | |
272 | return seg; | |
273 | } | |
274 | return task->thread.gsindex; | |
275 | case offsetof(struct user_regs_struct, ds): | |
276 | if (task == current) { | |
277 | asm("movl %%ds,%0" : "=r" (seg)); | |
278 | return seg; | |
279 | } | |
280 | return task->thread.ds; | |
281 | case offsetof(struct user_regs_struct, es): | |
282 | if (task == current) { | |
283 | asm("movl %%es,%0" : "=r" (seg)); | |
284 | return seg; | |
285 | } | |
286 | return task->thread.es; | |
287 | ||
288 | case offsetof(struct user_regs_struct, cs): | |
289 | case offsetof(struct user_regs_struct, ss): | |
290 | break; | |
291 | } | |
292 | return *pt_regs_access(task_pt_regs(task), offset); | |
293 | } | |
294 | ||
295 | static int set_segment_reg(struct task_struct *task, | |
296 | unsigned long offset, u16 value) | |
297 | { | |
298 | /* | |
299 | * The value argument was already truncated to 16 bits. | |
300 | */ | |
301 | if (invalid_selector(value)) | |
302 | return -EIO; | |
303 | ||
304 | switch (offset) { | |
305 | case offsetof(struct user_regs_struct,fs): | |
2047b08b RM |
306 | task->thread.fsindex = value; |
307 | if (task == current) | |
308 | loadsegment(fs, task->thread.fsindex); | |
309 | break; | |
310 | case offsetof(struct user_regs_struct,gs): | |
2047b08b RM |
311 | task->thread.gsindex = value; |
312 | if (task == current) | |
313 | load_gs_index(task->thread.gsindex); | |
314 | break; | |
315 | case offsetof(struct user_regs_struct,ds): | |
316 | task->thread.ds = value; | |
317 | if (task == current) | |
318 | loadsegment(ds, task->thread.ds); | |
319 | break; | |
320 | case offsetof(struct user_regs_struct,es): | |
321 | task->thread.es = value; | |
322 | if (task == current) | |
323 | loadsegment(es, task->thread.es); | |
324 | break; | |
325 | ||
326 | /* | |
327 | * Can't actually change these in 64-bit mode. | |
328 | */ | |
329 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
330 | if (unlikely(value == 0)) |
331 | return -EIO; | |
08571f1a | 332 | task_pt_regs(task)->cs = value; |
cb757c41 | 333 | break; |
2047b08b | 334 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
335 | if (unlikely(value == 0)) |
336 | return -EIO; | |
08571f1a | 337 | task_pt_regs(task)->ss = value; |
cb757c41 | 338 | break; |
2047b08b RM |
339 | } |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
2047b08b RM |
344 | #endif /* CONFIG_X86_32 */ |
345 | ||
06ee1b68 | 346 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 347 | { |
06ee1b68 RM |
348 | unsigned long retval = task_pt_regs(task)->flags; |
349 | ||
350 | /* | |
351 | * If the debugger set TF, hide it from the readout. | |
352 | */ | |
353 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
354 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 355 | |
1da177e4 LT |
356 | return retval; |
357 | } | |
358 | ||
06ee1b68 RM |
359 | static int set_flags(struct task_struct *task, unsigned long value) |
360 | { | |
361 | struct pt_regs *regs = task_pt_regs(task); | |
362 | ||
363 | /* | |
364 | * If the user value contains TF, mark that | |
365 | * it was not "us" (the debugger) that set it. | |
366 | * If not, make sure it stays set if we had. | |
367 | */ | |
368 | if (value & X86_EFLAGS_TF) | |
369 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
370 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
371 | value |= X86_EFLAGS_TF; | |
372 | ||
373 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | static int putreg(struct task_struct *child, | |
379 | unsigned long offset, unsigned long value) | |
380 | { | |
381 | switch (offset) { | |
382 | case offsetof(struct user_regs_struct, cs): | |
383 | case offsetof(struct user_regs_struct, ds): | |
384 | case offsetof(struct user_regs_struct, es): | |
385 | case offsetof(struct user_regs_struct, fs): | |
386 | case offsetof(struct user_regs_struct, gs): | |
387 | case offsetof(struct user_regs_struct, ss): | |
388 | return set_segment_reg(child, offset, value); | |
389 | ||
390 | case offsetof(struct user_regs_struct, flags): | |
391 | return set_flags(child, value); | |
2047b08b RM |
392 | |
393 | #ifdef CONFIG_X86_64 | |
394 | case offsetof(struct user_regs_struct,fs_base): | |
d696ca01 | 395 | if (value >= TASK_SIZE_MAX) |
2047b08b RM |
396 | return -EIO; |
397 | /* | |
398 | * When changing the segment base, use do_arch_prctl | |
399 | * to set either thread.fs or thread.fsindex and the | |
400 | * corresponding GDT slot. | |
401 | */ | |
296f781a | 402 | if (child->thread.fsbase != value) |
2047b08b RM |
403 | return do_arch_prctl(child, ARCH_SET_FS, value); |
404 | return 0; | |
405 | case offsetof(struct user_regs_struct,gs_base): | |
406 | /* | |
407 | * Exactly the same here as the %fs handling above. | |
408 | */ | |
d696ca01 | 409 | if (value >= TASK_SIZE_MAX) |
2047b08b | 410 | return -EIO; |
296f781a | 411 | if (child->thread.gsbase != value) |
2047b08b RM |
412 | return do_arch_prctl(child, ARCH_SET_GS, value); |
413 | return 0; | |
414 | #endif | |
06ee1b68 RM |
415 | } |
416 | ||
417 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
422 | { | |
423 | switch (offset) { | |
424 | case offsetof(struct user_regs_struct, cs): | |
425 | case offsetof(struct user_regs_struct, ds): | |
426 | case offsetof(struct user_regs_struct, es): | |
427 | case offsetof(struct user_regs_struct, fs): | |
428 | case offsetof(struct user_regs_struct, gs): | |
429 | case offsetof(struct user_regs_struct, ss): | |
430 | return get_segment_reg(task, offset); | |
431 | ||
432 | case offsetof(struct user_regs_struct, flags): | |
433 | return get_flags(task); | |
2047b08b RM |
434 | |
435 | #ifdef CONFIG_X86_64 | |
436 | case offsetof(struct user_regs_struct, fs_base): { | |
437 | /* | |
731e33e3 AL |
438 | * XXX: This will not behave as expected if called on |
439 | * current or if fsindex != 0. | |
2047b08b | 440 | */ |
296f781a | 441 | return task->thread.fsbase; |
2047b08b RM |
442 | } |
443 | case offsetof(struct user_regs_struct, gs_base): { | |
444 | /* | |
731e33e3 AL |
445 | * XXX: This will not behave as expected if called on |
446 | * current or if fsindex != 0. | |
2047b08b | 447 | */ |
296f781a | 448 | return task->thread.gsbase; |
2047b08b RM |
449 | } |
450 | #endif | |
06ee1b68 RM |
451 | } |
452 | ||
453 | return *pt_regs_access(task_pt_regs(task), offset); | |
454 | } | |
455 | ||
91e7b707 RM |
456 | static int genregs_get(struct task_struct *target, |
457 | const struct user_regset *regset, | |
458 | unsigned int pos, unsigned int count, | |
459 | void *kbuf, void __user *ubuf) | |
460 | { | |
461 | if (kbuf) { | |
462 | unsigned long *k = kbuf; | |
04a1e62c | 463 | while (count >= sizeof(*k)) { |
91e7b707 RM |
464 | *k++ = getreg(target, pos); |
465 | count -= sizeof(*k); | |
466 | pos += sizeof(*k); | |
467 | } | |
468 | } else { | |
469 | unsigned long __user *u = ubuf; | |
04a1e62c | 470 | while (count >= sizeof(*u)) { |
91e7b707 RM |
471 | if (__put_user(getreg(target, pos), u++)) |
472 | return -EFAULT; | |
473 | count -= sizeof(*u); | |
474 | pos += sizeof(*u); | |
475 | } | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | static int genregs_set(struct task_struct *target, | |
482 | const struct user_regset *regset, | |
483 | unsigned int pos, unsigned int count, | |
484 | const void *kbuf, const void __user *ubuf) | |
485 | { | |
486 | int ret = 0; | |
487 | if (kbuf) { | |
488 | const unsigned long *k = kbuf; | |
04a1e62c | 489 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
490 | ret = putreg(target, pos, *k++); |
491 | count -= sizeof(*k); | |
492 | pos += sizeof(*k); | |
493 | } | |
494 | } else { | |
495 | const unsigned long __user *u = ubuf; | |
04a1e62c | 496 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
497 | unsigned long word; |
498 | ret = __get_user(word, u++); | |
499 | if (ret) | |
500 | break; | |
501 | ret = putreg(target, pos, word); | |
502 | count -= sizeof(*u); | |
503 | pos += sizeof(*u); | |
504 | } | |
505 | } | |
506 | return ret; | |
507 | } | |
508 | ||
a8b0ca17 | 509 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
510 | struct perf_sample_data *data, |
511 | struct pt_regs *regs) | |
d9771e8c | 512 | { |
0f534093 | 513 | int i; |
24f1e32c | 514 | struct thread_struct *thread = &(current->thread); |
0f534093 | 515 | |
72f674d2 P |
516 | /* |
517 | * Store in the virtual DR6 register the fact that the breakpoint | |
518 | * was hit so the thread's debugger will see it. | |
519 | */ | |
24f1e32c FW |
520 | for (i = 0; i < HBP_NUM; i++) { |
521 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 522 | break; |
24f1e32c | 523 | } |
d9771e8c | 524 | |
72f674d2 P |
525 | thread->debugreg6 |= (DR_TRAP0 << i); |
526 | } | |
d9771e8c | 527 | |
d9771e8c | 528 | /* |
24f1e32c FW |
529 | * Walk through every ptrace breakpoints for this thread and |
530 | * build the dr7 value on top of their attributes. | |
531 | * | |
d9771e8c | 532 | */ |
24f1e32c | 533 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 534 | { |
24f1e32c FW |
535 | int i; |
536 | int dr7 = 0; | |
537 | struct arch_hw_breakpoint *info; | |
538 | ||
539 | for (i = 0; i < HBP_NUM; i++) { | |
540 | if (bp[i] && !bp[i]->attr.disabled) { | |
541 | info = counter_arch_bp(bp[i]); | |
542 | dr7 |= encode_dr7(i, info->len, info->type); | |
543 | } | |
0f534093 | 544 | } |
24f1e32c FW |
545 | |
546 | return dr7; | |
d9771e8c RM |
547 | } |
548 | ||
9afe33ad ON |
549 | static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
550 | int len, int type, bool disabled) | |
551 | { | |
552 | int err, bp_len, bp_type; | |
553 | ||
554 | err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); | |
555 | if (!err) { | |
556 | attr->bp_len = bp_len; | |
557 | attr->bp_type = bp_type; | |
558 | attr->disabled = disabled; | |
559 | } | |
560 | ||
561 | return err; | |
562 | } | |
563 | ||
564 | static struct perf_event * | |
565 | ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, | |
566 | unsigned long addr, bool disabled) | |
5fa10b28 | 567 | { |
b326e956 | 568 | struct perf_event_attr attr; |
9afe33ad ON |
569 | int err; |
570 | ||
571 | ptrace_breakpoint_init(&attr); | |
572 | attr.bp_addr = addr; | |
5fa10b28 | 573 | |
9afe33ad | 574 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
5fa10b28 | 575 | if (err) |
9afe33ad ON |
576 | return ERR_PTR(err); |
577 | ||
578 | return register_user_hw_breakpoint(&attr, ptrace_triggered, | |
579 | NULL, tsk); | |
580 | } | |
581 | ||
582 | static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, | |
583 | int disabled) | |
584 | { | |
585 | struct perf_event_attr attr = bp->attr; | |
586 | int err; | |
5fa10b28 | 587 | |
9afe33ad ON |
588 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
589 | if (err) | |
590 | return err; | |
5fa10b28 | 591 | |
2f0993e0 | 592 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
593 | } |
594 | ||
72f674d2 P |
595 | /* |
596 | * Handle ptrace writes to debug register 7. | |
597 | */ | |
598 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 599 | { |
29a55513 | 600 | struct thread_struct *thread = &tsk->thread; |
24f1e32c | 601 | unsigned long old_dr7; |
29a55513 ON |
602 | bool second_pass = false; |
603 | int i, rc, ret = 0; | |
72f674d2 P |
604 | |
605 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 606 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
29a55513 | 607 | |
72f674d2 | 608 | restore: |
29a55513 | 609 | rc = 0; |
72f674d2 | 610 | for (i = 0; i < HBP_NUM; i++) { |
e6a7d607 ON |
611 | unsigned len, type; |
612 | bool disabled = !decode_dr7(data, i, &len, &type); | |
613 | struct perf_event *bp = thread->ptrace_bps[i]; | |
614 | ||
29a55513 ON |
615 | if (!bp) { |
616 | if (disabled) | |
617 | continue; | |
b87a95ad ON |
618 | |
619 | bp = ptrace_register_breakpoint(tsk, | |
620 | len, type, 0, disabled); | |
621 | if (IS_ERR(bp)) { | |
622 | rc = PTR_ERR(bp); | |
623 | break; | |
624 | } | |
625 | ||
626 | thread->ptrace_bps[i] = bp; | |
627 | continue; | |
72f674d2 | 628 | } |
0f534093 | 629 | |
9afe33ad | 630 | rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
44234adc | 631 | if (rc) |
24f1e32c | 632 | break; |
72f674d2 | 633 | } |
29a55513 ON |
634 | |
635 | /* Restore if the first pass failed, second_pass shouldn't fail. */ | |
636 | if (rc && !WARN_ON(second_pass)) { | |
637 | ret = rc; | |
638 | data = old_dr7; | |
639 | second_pass = true; | |
72f674d2 P |
640 | goto restore; |
641 | } | |
87dc669b | 642 | |
29a55513 | 643 | return ret; |
72f674d2 | 644 | } |
0f534093 | 645 | |
72f674d2 P |
646 | /* |
647 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
648 | */ | |
9d22b536 | 649 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 | 650 | { |
61e305c7 | 651 | struct thread_struct *thread = &tsk->thread; |
72f674d2 P |
652 | unsigned long val = 0; |
653 | ||
24f1e32c | 654 | if (n < HBP_NUM) { |
02be46fb | 655 | struct perf_event *bp = thread->ptrace_bps[n]; |
87dc669b | 656 | |
02be46fb | 657 | if (bp) |
87dc669b | 658 | val = bp->hw.info.address; |
24f1e32c | 659 | } else if (n == 6) { |
72f674d2 | 660 | val = thread->debugreg6; |
61e305c7 | 661 | } else if (n == 7) { |
326264a0 | 662 | val = thread->ptrace_dr7; |
24f1e32c | 663 | } |
72f674d2 P |
664 | return val; |
665 | } | |
0f534093 | 666 | |
24f1e32c FW |
667 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
668 | unsigned long addr) | |
669 | { | |
24f1e32c | 670 | struct thread_struct *t = &tsk->thread; |
9afe33ad | 671 | struct perf_event *bp = t->ptrace_bps[nr]; |
87dc669b FW |
672 | int err = 0; |
673 | ||
9afe33ad | 674 | if (!bp) { |
44234adc | 675 | /* |
9afe33ad ON |
676 | * Put stub len and type to create an inactive but correct bp. |
677 | * | |
44234adc FW |
678 | * CHECKME: the previous code returned -EIO if the addr wasn't |
679 | * a valid task virtual addr. The new one will return -EINVAL in | |
680 | * this case. | |
681 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
682 | * but -EIO looks better for ptrace, since we refuse a register | |
683 | * writing for the user. And anyway this is the previous | |
684 | * behaviour. | |
685 | */ | |
9afe33ad ON |
686 | bp = ptrace_register_breakpoint(tsk, |
687 | X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, | |
688 | addr, true); | |
689 | if (IS_ERR(bp)) | |
87dc669b | 690 | err = PTR_ERR(bp); |
9afe33ad ON |
691 | else |
692 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 693 | } else { |
9afe33ad | 694 | struct perf_event_attr attr = bp->attr; |
5fa10b28 | 695 | |
5fa10b28 | 696 | attr.bp_addr = addr; |
44234adc | 697 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 698 | } |
9afe33ad | 699 | |
87dc669b | 700 | return err; |
d9771e8c RM |
701 | } |
702 | ||
72f674d2 P |
703 | /* |
704 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
705 | */ | |
98b8b99a HS |
706 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
707 | unsigned long val) | |
72f674d2 | 708 | { |
61e305c7 | 709 | struct thread_struct *thread = &tsk->thread; |
72f674d2 | 710 | /* There are no DR4 or DR5 registers */ |
61e305c7 | 711 | int rc = -EIO; |
72f674d2 | 712 | |
72f674d2 | 713 | if (n < HBP_NUM) { |
24f1e32c | 714 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
61e305c7 ON |
715 | } else if (n == 6) { |
716 | thread->debugreg6 = val; | |
717 | rc = 0; | |
718 | } else if (n == 7) { | |
72f674d2 | 719 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
720 | if (!rc) |
721 | thread->ptrace_dr7 = val; | |
722 | } | |
72f674d2 | 723 | return rc; |
d9771e8c RM |
724 | } |
725 | ||
325af5fb RM |
726 | /* |
727 | * These access the current or another (stopped) task's io permission | |
728 | * bitmap for debugging or core dump. | |
729 | */ | |
730 | static int ioperm_active(struct task_struct *target, | |
731 | const struct user_regset *regset) | |
732 | { | |
733 | return target->thread.io_bitmap_max / regset->size; | |
734 | } | |
b4ef95de | 735 | |
325af5fb RM |
736 | static int ioperm_get(struct task_struct *target, |
737 | const struct user_regset *regset, | |
738 | unsigned int pos, unsigned int count, | |
739 | void *kbuf, void __user *ubuf) | |
eee3af4a | 740 | { |
325af5fb | 741 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
742 | return -ENXIO; |
743 | ||
325af5fb RM |
744 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
745 | target->thread.io_bitmap_ptr, | |
746 | 0, IO_BITMAP_BYTES); | |
747 | } | |
748 | ||
1da177e4 LT |
749 | /* |
750 | * Called by kernel/ptrace.c when detaching.. | |
751 | * | |
752 | * Make sure the single step bit is not set. | |
753 | */ | |
754 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 755 | { |
7f232343 | 756 | user_disable_single_step(child); |
e9c86c78 | 757 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 758 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 759 | #endif |
1da177e4 LT |
760 | } |
761 | ||
5a4646a4 RM |
762 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
763 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
764 | #endif | |
765 | ||
9b05a69e NK |
766 | long arch_ptrace(struct task_struct *child, long request, |
767 | unsigned long addr, unsigned long data) | |
1da177e4 | 768 | { |
5a4646a4 | 769 | int ret; |
1da177e4 LT |
770 | unsigned long __user *datap = (unsigned long __user *)data; |
771 | ||
1da177e4 | 772 | switch (request) { |
1da177e4 LT |
773 | /* read the word at location addr in the USER area. */ |
774 | case PTRACE_PEEKUSR: { | |
775 | unsigned long tmp; | |
776 | ||
777 | ret = -EIO; | |
eb5a3699 | 778 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
779 | break; |
780 | ||
781 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 782 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 783 | tmp = getreg(child, addr); |
e9c86c78 RM |
784 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
785 | addr <= offsetof(struct user, u_debugreg[7])) { | |
786 | addr -= offsetof(struct user, u_debugreg[0]); | |
787 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
788 | } |
789 | ret = put_user(tmp, datap); | |
790 | break; | |
791 | } | |
792 | ||
1da177e4 LT |
793 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
794 | ret = -EIO; | |
eb5a3699 | 795 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
796 | break; |
797 | ||
e9c86c78 | 798 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 799 | ret = putreg(child, addr, data); |
e9c86c78 RM |
800 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
801 | addr <= offsetof(struct user, u_debugreg[7])) { | |
802 | addr -= offsetof(struct user, u_debugreg[0]); | |
803 | ret = ptrace_set_debugreg(child, | |
804 | addr / sizeof(data), data); | |
1da177e4 | 805 | } |
e9c86c78 | 806 | break; |
1da177e4 | 807 | |
5a4646a4 RM |
808 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
809 | return copy_regset_to_user(child, | |
810 | task_user_regset_view(current), | |
811 | REGSET_GENERAL, | |
812 | 0, sizeof(struct user_regs_struct), | |
813 | datap); | |
814 | ||
815 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
816 | return copy_regset_from_user(child, | |
817 | task_user_regset_view(current), | |
818 | REGSET_GENERAL, | |
819 | 0, sizeof(struct user_regs_struct), | |
820 | datap); | |
821 | ||
822 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
823 | return copy_regset_to_user(child, | |
824 | task_user_regset_view(current), | |
825 | REGSET_FP, | |
826 | 0, sizeof(struct user_i387_struct), | |
827 | datap); | |
828 | ||
829 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
830 | return copy_regset_from_user(child, | |
831 | task_user_regset_view(current), | |
832 | REGSET_FP, | |
833 | 0, sizeof(struct user_i387_struct), | |
834 | datap); | |
1da177e4 | 835 | |
e9c86c78 | 836 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
837 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
838 | return copy_regset_to_user(child, &user_x86_32_view, | |
839 | REGSET_XFP, | |
840 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 841 | datap) ? -EIO : 0; |
5a4646a4 RM |
842 | |
843 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
844 | return copy_regset_from_user(child, &user_x86_32_view, | |
845 | REGSET_XFP, | |
846 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 847 | datap) ? -EIO : 0; |
e9c86c78 | 848 | #endif |
1da177e4 | 849 | |
e9c86c78 | 850 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 851 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 852 | if ((int) addr < 0) |
efd1ca52 RM |
853 | return -EIO; |
854 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 855 | (struct user_desc __user *)data); |
1da177e4 LT |
856 | break; |
857 | ||
858 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 859 | if ((int) addr < 0) |
efd1ca52 RM |
860 | return -EIO; |
861 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 862 | (struct user_desc __user *)data, 0); |
1da177e4 | 863 | break; |
e9c86c78 RM |
864 | #endif |
865 | ||
866 | #ifdef CONFIG_X86_64 | |
867 | /* normal 64bit interface to access TLS data. | |
868 | Works just like arch_prctl, except that the arguments | |
869 | are reversed. */ | |
870 | case PTRACE_ARCH_PRCTL: | |
871 | ret = do_arch_prctl(child, data, addr); | |
872 | break; | |
873 | #endif | |
1da177e4 LT |
874 | |
875 | default: | |
876 | ret = ptrace_request(child, request, addr, data); | |
877 | break; | |
878 | } | |
d9771e8c | 879 | |
1da177e4 LT |
880 | return ret; |
881 | } | |
882 | ||
cb757c41 RM |
883 | #ifdef CONFIG_IA32_EMULATION |
884 | ||
099cd6e9 RM |
885 | #include <linux/compat.h> |
886 | #include <linux/syscalls.h> | |
887 | #include <asm/ia32.h> | |
cb757c41 RM |
888 | #include <asm/user32.h> |
889 | ||
890 | #define R32(l,q) \ | |
891 | case offsetof(struct user32, regs.l): \ | |
892 | regs->q = value; break | |
893 | ||
894 | #define SEG32(rs) \ | |
895 | case offsetof(struct user32, regs.rs): \ | |
896 | return set_segment_reg(child, \ | |
897 | offsetof(struct user_regs_struct, rs), \ | |
898 | value); \ | |
899 | break | |
900 | ||
901 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
902 | { | |
903 | struct pt_regs *regs = task_pt_regs(child); | |
904 | ||
905 | switch (regno) { | |
906 | ||
907 | SEG32(cs); | |
908 | SEG32(ds); | |
909 | SEG32(es); | |
910 | SEG32(fs); | |
911 | SEG32(gs); | |
912 | SEG32(ss); | |
913 | ||
914 | R32(ebx, bx); | |
915 | R32(ecx, cx); | |
916 | R32(edx, dx); | |
917 | R32(edi, di); | |
918 | R32(esi, si); | |
919 | R32(ebp, bp); | |
920 | R32(eax, ax); | |
cb757c41 RM |
921 | R32(eip, ip); |
922 | R32(esp, sp); | |
923 | ||
40f0933d RM |
924 | case offsetof(struct user32, regs.orig_eax): |
925 | /* | |
8cb3ed13 RM |
926 | * A 32-bit debugger setting orig_eax means to restore |
927 | * the state of the task restarting a 32-bit syscall. | |
928 | * Make sure we interpret the -ERESTART* codes correctly | |
929 | * in case the task is not actually still sitting at the | |
930 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 931 | */ |
8cb3ed13 RM |
932 | regs->orig_ax = value; |
933 | if (syscall_get_nr(child, regs) >= 0) | |
934 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
935 | break; |
936 | ||
cb757c41 RM |
937 | case offsetof(struct user32, regs.eflags): |
938 | return set_flags(child, value); | |
939 | ||
940 | case offsetof(struct user32, u_debugreg[0]) ... | |
941 | offsetof(struct user32, u_debugreg[7]): | |
942 | regno -= offsetof(struct user32, u_debugreg[0]); | |
943 | return ptrace_set_debugreg(child, regno / 4, value); | |
944 | ||
945 | default: | |
946 | if (regno > sizeof(struct user32) || (regno & 3)) | |
947 | return -EIO; | |
948 | ||
949 | /* | |
950 | * Other dummy fields in the virtual user structure | |
951 | * are ignored | |
952 | */ | |
953 | break; | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
958 | #undef R32 | |
959 | #undef SEG32 | |
960 | ||
961 | #define R32(l,q) \ | |
962 | case offsetof(struct user32, regs.l): \ | |
963 | *val = regs->q; break | |
964 | ||
965 | #define SEG32(rs) \ | |
966 | case offsetof(struct user32, regs.rs): \ | |
967 | *val = get_segment_reg(child, \ | |
968 | offsetof(struct user_regs_struct, rs)); \ | |
969 | break | |
970 | ||
971 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
972 | { | |
973 | struct pt_regs *regs = task_pt_regs(child); | |
974 | ||
975 | switch (regno) { | |
976 | ||
977 | SEG32(ds); | |
978 | SEG32(es); | |
979 | SEG32(fs); | |
980 | SEG32(gs); | |
981 | ||
982 | R32(cs, cs); | |
983 | R32(ss, ss); | |
984 | R32(ebx, bx); | |
985 | R32(ecx, cx); | |
986 | R32(edx, dx); | |
987 | R32(edi, di); | |
988 | R32(esi, si); | |
989 | R32(ebp, bp); | |
990 | R32(eax, ax); | |
991 | R32(orig_eax, orig_ax); | |
992 | R32(eip, ip); | |
993 | R32(esp, sp); | |
994 | ||
995 | case offsetof(struct user32, regs.eflags): | |
996 | *val = get_flags(child); | |
997 | break; | |
998 | ||
999 | case offsetof(struct user32, u_debugreg[0]) ... | |
1000 | offsetof(struct user32, u_debugreg[7]): | |
1001 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1002 | *val = ptrace_get_debugreg(child, regno / 4); | |
1003 | break; | |
1004 | ||
1005 | default: | |
1006 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1007 | return -EIO; | |
1008 | ||
1009 | /* | |
1010 | * Other dummy fields in the virtual user structure | |
1011 | * are ignored | |
1012 | */ | |
1013 | *val = 0; | |
1014 | break; | |
1015 | } | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | #undef R32 | |
1020 | #undef SEG32 | |
1021 | ||
91e7b707 RM |
1022 | static int genregs32_get(struct task_struct *target, |
1023 | const struct user_regset *regset, | |
1024 | unsigned int pos, unsigned int count, | |
1025 | void *kbuf, void __user *ubuf) | |
1026 | { | |
1027 | if (kbuf) { | |
1028 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1029 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1030 | getreg32(target, pos, k++); |
1031 | count -= sizeof(*k); | |
1032 | pos += sizeof(*k); | |
1033 | } | |
1034 | } else { | |
1035 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1036 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1037 | compat_ulong_t word; |
1038 | getreg32(target, pos, &word); | |
1039 | if (__put_user(word, u++)) | |
1040 | return -EFAULT; | |
1041 | count -= sizeof(*u); | |
1042 | pos += sizeof(*u); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | static int genregs32_set(struct task_struct *target, | |
1050 | const struct user_regset *regset, | |
1051 | unsigned int pos, unsigned int count, | |
1052 | const void *kbuf, const void __user *ubuf) | |
1053 | { | |
1054 | int ret = 0; | |
1055 | if (kbuf) { | |
1056 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1057 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1058 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1059 | count -= sizeof(*k); |
1060 | pos += sizeof(*k); | |
1061 | } | |
1062 | } else { | |
1063 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1064 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1065 | compat_ulong_t word; |
1066 | ret = __get_user(word, u++); | |
1067 | if (ret) | |
1068 | break; | |
f9cb02b0 | 1069 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1070 | count -= sizeof(*u); |
1071 | pos += sizeof(*u); | |
1072 | } | |
1073 | } | |
1074 | return ret; | |
1075 | } | |
1076 | ||
601275c3 BG |
1077 | static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request, |
1078 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1079 | { | |
1080 | unsigned long addr = caddr; | |
1081 | unsigned long data = cdata; | |
1082 | void __user *datap = compat_ptr(data); | |
1083 | int ret; | |
1084 | __u32 val; | |
1085 | ||
1086 | switch (request) { | |
1087 | case PTRACE_PEEKUSR: | |
1088 | ret = getreg32(child, addr, &val); | |
1089 | if (ret == 0) | |
1090 | ret = put_user(val, (__u32 __user *)datap); | |
1091 | break; | |
1092 | ||
1093 | case PTRACE_POKEUSR: | |
1094 | ret = putreg32(child, addr, data); | |
1095 | break; | |
1096 | ||
1097 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1098 | return copy_regset_to_user(child, &user_x86_32_view, | |
1099 | REGSET_GENERAL, | |
1100 | 0, sizeof(struct user_regs_struct32), | |
1101 | datap); | |
1102 | ||
1103 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1104 | return copy_regset_from_user(child, &user_x86_32_view, | |
1105 | REGSET_GENERAL, 0, | |
1106 | sizeof(struct user_regs_struct32), | |
1107 | datap); | |
1108 | ||
1109 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1110 | return copy_regset_to_user(child, &user_x86_32_view, | |
1111 | REGSET_FP, 0, | |
1112 | sizeof(struct user_i387_ia32_struct), | |
1113 | datap); | |
1114 | ||
1115 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1116 | return copy_regset_from_user( | |
1117 | child, &user_x86_32_view, REGSET_FP, | |
1118 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1119 | ||
1120 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1121 | return copy_regset_to_user(child, &user_x86_32_view, | |
1122 | REGSET_XFP, 0, | |
1123 | sizeof(struct user32_fxsr_struct), | |
1124 | datap); | |
1125 | ||
1126 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1127 | return copy_regset_from_user(child, &user_x86_32_view, | |
1128 | REGSET_XFP, 0, | |
1129 | sizeof(struct user32_fxsr_struct), | |
1130 | datap); | |
1131 | ||
1132 | case PTRACE_GET_THREAD_AREA: | |
1133 | case PTRACE_SET_THREAD_AREA: | |
1134 | return arch_ptrace(child, request, addr, data); | |
1135 | ||
1136 | default: | |
1137 | return compat_ptrace_request(child, request, addr, data); | |
1138 | } | |
1139 | ||
1140 | return ret; | |
1141 | } | |
1142 | #endif /* CONFIG_IA32_EMULATION */ | |
1143 | ||
55283e25 L |
1144 | #ifdef CONFIG_X86_X32_ABI |
1145 | static long x32_arch_ptrace(struct task_struct *child, | |
1146 | compat_long_t request, compat_ulong_t caddr, | |
1147 | compat_ulong_t cdata) | |
1148 | { | |
1149 | unsigned long addr = caddr; | |
1150 | unsigned long data = cdata; | |
1151 | void __user *datap = compat_ptr(data); | |
1152 | int ret; | |
1153 | ||
1154 | switch (request) { | |
1155 | /* Read 32bits at location addr in the USER area. Only allow | |
1156 | to return the lower 32bits of segment and debug registers. */ | |
1157 | case PTRACE_PEEKUSR: { | |
1158 | u32 tmp; | |
1159 | ||
1160 | ret = -EIO; | |
1161 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1162 | addr < offsetof(struct user_regs_struct, cs)) | |
1163 | break; | |
1164 | ||
1165 | tmp = 0; /* Default return condition */ | |
1166 | if (addr < sizeof(struct user_regs_struct)) | |
1167 | tmp = getreg(child, addr); | |
1168 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1169 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1170 | addr -= offsetof(struct user, u_debugreg[0]); | |
1171 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1172 | } | |
1173 | ret = put_user(tmp, (__u32 __user *)datap); | |
1174 | break; | |
1175 | } | |
1176 | ||
1177 | /* Write the word at location addr in the USER area. Only allow | |
1178 | to update segment and debug registers with the upper 32bits | |
1179 | zero-extended. */ | |
1180 | case PTRACE_POKEUSR: | |
1181 | ret = -EIO; | |
1182 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1183 | addr < offsetof(struct user_regs_struct, cs)) | |
1184 | break; | |
1185 | ||
1186 | if (addr < sizeof(struct user_regs_struct)) | |
1187 | ret = putreg(child, addr, data); | |
1188 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1189 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1190 | addr -= offsetof(struct user, u_debugreg[0]); | |
1191 | ret = ptrace_set_debugreg(child, | |
1192 | addr / sizeof(data), data); | |
1193 | } | |
1194 | break; | |
1195 | ||
1196 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1197 | return copy_regset_to_user(child, | |
1198 | task_user_regset_view(current), | |
1199 | REGSET_GENERAL, | |
1200 | 0, sizeof(struct user_regs_struct), | |
1201 | datap); | |
1202 | ||
1203 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1204 | return copy_regset_from_user(child, | |
1205 | task_user_regset_view(current), | |
1206 | REGSET_GENERAL, | |
1207 | 0, sizeof(struct user_regs_struct), | |
1208 | datap); | |
1209 | ||
1210 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1211 | return copy_regset_to_user(child, | |
1212 | task_user_regset_view(current), | |
1213 | REGSET_FP, | |
1214 | 0, sizeof(struct user_i387_struct), | |
1215 | datap); | |
1216 | ||
1217 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1218 | return copy_regset_from_user(child, | |
1219 | task_user_regset_view(current), | |
1220 | REGSET_FP, | |
1221 | 0, sizeof(struct user_i387_struct), | |
1222 | datap); | |
1223 | ||
55283e25 L |
1224 | default: |
1225 | return compat_ptrace_request(child, request, addr, data); | |
1226 | } | |
1227 | ||
1228 | return ret; | |
1229 | } | |
1230 | #endif | |
1231 | ||
601275c3 | 1232 | #ifdef CONFIG_COMPAT |
562b80ba RM |
1233 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1234 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1235 | { |
55283e25 | 1236 | #ifdef CONFIG_X86_X32_ABI |
abfb9498 | 1237 | if (!in_ia32_syscall()) |
55283e25 L |
1238 | return x32_arch_ptrace(child, request, caddr, cdata); |
1239 | #endif | |
601275c3 BG |
1240 | #ifdef CONFIG_IA32_EMULATION |
1241 | return ia32_arch_ptrace(child, request, caddr, cdata); | |
1242 | #else | |
1243 | return 0; | |
1244 | #endif | |
099cd6e9 | 1245 | } |
601275c3 | 1246 | #endif /* CONFIG_COMPAT */ |
cb757c41 | 1247 | |
070459d9 RM |
1248 | #ifdef CONFIG_X86_64 |
1249 | ||
5b3efd50 | 1250 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1251 | [REGSET_GENERAL] = { |
1252 | .core_note_type = NT_PRSTATUS, | |
1253 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1254 | .size = sizeof(long), .align = sizeof(long), | |
1255 | .get = genregs_get, .set = genregs_set | |
1256 | }, | |
1257 | [REGSET_FP] = { | |
1258 | .core_note_type = NT_PRFPREG, | |
1259 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1260 | .size = sizeof(long), .align = sizeof(long), | |
678eaf60 | 1261 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1262 | }, |
5b3efd50 SS |
1263 | [REGSET_XSTATE] = { |
1264 | .core_note_type = NT_X86_XSTATE, | |
1265 | .size = sizeof(u64), .align = sizeof(u64), | |
1266 | .active = xstateregs_active, .get = xstateregs_get, | |
1267 | .set = xstateregs_set | |
1268 | }, | |
325af5fb RM |
1269 | [REGSET_IOPERM64] = { |
1270 | .core_note_type = NT_386_IOPERM, | |
1271 | .n = IO_BITMAP_LONGS, | |
1272 | .size = sizeof(long), .align = sizeof(long), | |
1273 | .active = ioperm_active, .get = ioperm_get | |
1274 | }, | |
070459d9 RM |
1275 | }; |
1276 | ||
1277 | static const struct user_regset_view user_x86_64_view = { | |
1278 | .name = "x86_64", .e_machine = EM_X86_64, | |
1279 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1280 | }; | |
1281 | ||
1282 | #else /* CONFIG_X86_32 */ | |
1283 | ||
1284 | #define user_regs_struct32 user_regs_struct | |
1285 | #define genregs32_get genregs_get | |
1286 | #define genregs32_set genregs_set | |
1287 | ||
1288 | #endif /* CONFIG_X86_64 */ | |
1289 | ||
1290 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1291 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1292 | [REGSET_GENERAL] = { |
1293 | .core_note_type = NT_PRSTATUS, | |
1294 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1295 | .size = sizeof(u32), .align = sizeof(u32), | |
1296 | .get = genregs32_get, .set = genregs32_set | |
1297 | }, | |
1298 | [REGSET_FP] = { | |
1299 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1300 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 | 1301 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1302 | .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set |
070459d9 RM |
1303 | }, |
1304 | [REGSET_XFP] = { | |
1305 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1306 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 | 1307 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1308 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1309 | }, |
5b3efd50 SS |
1310 | [REGSET_XSTATE] = { |
1311 | .core_note_type = NT_X86_XSTATE, | |
1312 | .size = sizeof(u64), .align = sizeof(u64), | |
1313 | .active = xstateregs_active, .get = xstateregs_get, | |
1314 | .set = xstateregs_set | |
1315 | }, | |
070459d9 | 1316 | [REGSET_TLS] = { |
bb61682b | 1317 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1318 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1319 | .size = sizeof(struct user_desc), | |
1320 | .align = sizeof(struct user_desc), | |
1321 | .active = regset_tls_active, | |
1322 | .get = regset_tls_get, .set = regset_tls_set | |
1323 | }, | |
325af5fb RM |
1324 | [REGSET_IOPERM32] = { |
1325 | .core_note_type = NT_386_IOPERM, | |
1326 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1327 | .size = sizeof(u32), .align = sizeof(u32), | |
1328 | .active = ioperm_active, .get = ioperm_get | |
1329 | }, | |
070459d9 RM |
1330 | }; |
1331 | ||
1332 | static const struct user_regset_view user_x86_32_view = { | |
1333 | .name = "i386", .e_machine = EM_386, | |
1334 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1335 | }; | |
1336 | #endif | |
1337 | ||
5b3efd50 SS |
1338 | /* |
1339 | * This represents bytes 464..511 in the memory layout exported through | |
1340 | * the REGSET_XSTATE interface. | |
1341 | */ | |
1342 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1343 | ||
1344 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1345 | { | |
1346 | #ifdef CONFIG_X86_64 | |
1347 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1348 | #endif | |
1349 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1350 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1351 | #endif | |
1352 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1353 | } | |
1354 | ||
070459d9 RM |
1355 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1356 | { | |
1357 | #ifdef CONFIG_IA32_EMULATION | |
1358 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1359 | #endif | |
1360 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1361 | return &user_x86_32_view; | |
1362 | #endif | |
1363 | #ifdef CONFIG_X86_64 | |
1364 | return &user_x86_64_view; | |
1365 | #endif | |
1366 | } | |
1367 | ||
7f38551f ON |
1368 | static void fill_sigtrap_info(struct task_struct *tsk, |
1369 | struct pt_regs *regs, | |
1370 | int error_code, int si_code, | |
1371 | struct siginfo *info) | |
1da177e4 | 1372 | { |
51e7dc70 | 1373 | tsk->thread.trap_nr = X86_TRAP_DB; |
1da177e4 LT |
1374 | tsk->thread.error_code = error_code; |
1375 | ||
7f38551f ON |
1376 | memset(info, 0, sizeof(*info)); |
1377 | info->si_signo = SIGTRAP; | |
1378 | info->si_code = si_code; | |
f39b6f0e | 1379 | info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
7f38551f ON |
1380 | } |
1381 | ||
1382 | void user_single_step_siginfo(struct task_struct *tsk, | |
1383 | struct pt_regs *regs, | |
1384 | struct siginfo *info) | |
1385 | { | |
1386 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1387 | } | |
1da177e4 | 1388 | |
7f38551f ON |
1389 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1390 | int error_code, int si_code) | |
1391 | { | |
1392 | struct siginfo info; | |
1da177e4 | 1393 | |
7f38551f | 1394 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1395 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1396 | force_sig_info(SIGTRAP, &info, tsk); |
1397 | } |