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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): | |
306 | /* | |
307 | * If this is setting fs as for normal 64-bit use but | |
308 | * setting fs_base has implicitly changed it, leave it. | |
309 | */ | |
310 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
311 | task->thread.fs != 0) || | |
312 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
313 | task->thread.fs == 0)) | |
314 | break; | |
315 | task->thread.fsindex = value; | |
316 | if (task == current) | |
317 | loadsegment(fs, task->thread.fsindex); | |
318 | break; | |
319 | case offsetof(struct user_regs_struct,gs): | |
320 | /* | |
321 | * If this is setting gs as for normal 64-bit use but | |
322 | * setting gs_base has implicitly changed it, leave it. | |
323 | */ | |
324 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
325 | task->thread.gs != 0) || | |
326 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
327 | task->thread.gs == 0)) | |
328 | break; | |
329 | task->thread.gsindex = value; | |
330 | if (task == current) | |
331 | load_gs_index(task->thread.gsindex); | |
332 | break; | |
333 | case offsetof(struct user_regs_struct,ds): | |
334 | task->thread.ds = value; | |
335 | if (task == current) | |
336 | loadsegment(ds, task->thread.ds); | |
337 | break; | |
338 | case offsetof(struct user_regs_struct,es): | |
339 | task->thread.es = value; | |
340 | if (task == current) | |
341 | loadsegment(es, task->thread.es); | |
342 | break; | |
343 | ||
344 | /* | |
345 | * Can't actually change these in 64-bit mode. | |
346 | */ | |
347 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
348 | if (unlikely(value == 0)) |
349 | return -EIO; | |
08571f1a | 350 | task_pt_regs(task)->cs = value; |
cb757c41 | 351 | break; |
2047b08b | 352 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
353 | if (unlikely(value == 0)) |
354 | return -EIO; | |
08571f1a | 355 | task_pt_regs(task)->ss = value; |
cb757c41 | 356 | break; |
2047b08b RM |
357 | } |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
2047b08b RM |
362 | #endif /* CONFIG_X86_32 */ |
363 | ||
06ee1b68 | 364 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 365 | { |
06ee1b68 RM |
366 | unsigned long retval = task_pt_regs(task)->flags; |
367 | ||
368 | /* | |
369 | * If the debugger set TF, hide it from the readout. | |
370 | */ | |
371 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
372 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 373 | |
1da177e4 LT |
374 | return retval; |
375 | } | |
376 | ||
06ee1b68 RM |
377 | static int set_flags(struct task_struct *task, unsigned long value) |
378 | { | |
379 | struct pt_regs *regs = task_pt_regs(task); | |
380 | ||
381 | /* | |
382 | * If the user value contains TF, mark that | |
383 | * it was not "us" (the debugger) that set it. | |
384 | * If not, make sure it stays set if we had. | |
385 | */ | |
386 | if (value & X86_EFLAGS_TF) | |
387 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
388 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
389 | value |= X86_EFLAGS_TF; | |
390 | ||
391 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | static int putreg(struct task_struct *child, | |
397 | unsigned long offset, unsigned long value) | |
398 | { | |
399 | switch (offset) { | |
400 | case offsetof(struct user_regs_struct, cs): | |
401 | case offsetof(struct user_regs_struct, ds): | |
402 | case offsetof(struct user_regs_struct, es): | |
403 | case offsetof(struct user_regs_struct, fs): | |
404 | case offsetof(struct user_regs_struct, gs): | |
405 | case offsetof(struct user_regs_struct, ss): | |
406 | return set_segment_reg(child, offset, value); | |
407 | ||
408 | case offsetof(struct user_regs_struct, flags): | |
409 | return set_flags(child, value); | |
2047b08b RM |
410 | |
411 | #ifdef CONFIG_X86_64 | |
412 | case offsetof(struct user_regs_struct,fs_base): | |
413 | if (value >= TASK_SIZE_OF(child)) | |
414 | return -EIO; | |
415 | /* | |
416 | * When changing the segment base, use do_arch_prctl | |
417 | * to set either thread.fs or thread.fsindex and the | |
418 | * corresponding GDT slot. | |
419 | */ | |
420 | if (child->thread.fs != value) | |
421 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
422 | return 0; | |
423 | case offsetof(struct user_regs_struct,gs_base): | |
424 | /* | |
425 | * Exactly the same here as the %fs handling above. | |
426 | */ | |
427 | if (value >= TASK_SIZE_OF(child)) | |
428 | return -EIO; | |
429 | if (child->thread.gs != value) | |
430 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
431 | return 0; | |
432 | #endif | |
06ee1b68 RM |
433 | } |
434 | ||
435 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
440 | { | |
441 | switch (offset) { | |
442 | case offsetof(struct user_regs_struct, cs): | |
443 | case offsetof(struct user_regs_struct, ds): | |
444 | case offsetof(struct user_regs_struct, es): | |
445 | case offsetof(struct user_regs_struct, fs): | |
446 | case offsetof(struct user_regs_struct, gs): | |
447 | case offsetof(struct user_regs_struct, ss): | |
448 | return get_segment_reg(task, offset); | |
449 | ||
450 | case offsetof(struct user_regs_struct, flags): | |
451 | return get_flags(task); | |
2047b08b RM |
452 | |
453 | #ifdef CONFIG_X86_64 | |
454 | case offsetof(struct user_regs_struct, fs_base): { | |
455 | /* | |
456 | * do_arch_prctl may have used a GDT slot instead of | |
457 | * the MSR. To userland, it appears the same either | |
458 | * way, except the %fs segment selector might not be 0. | |
459 | */ | |
460 | unsigned int seg = task->thread.fsindex; | |
461 | if (task->thread.fs != 0) | |
462 | return task->thread.fs; | |
463 | if (task == current) | |
464 | asm("movl %%fs,%0" : "=r" (seg)); | |
465 | if (seg != FS_TLS_SEL) | |
466 | return 0; | |
467 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
468 | } | |
469 | case offsetof(struct user_regs_struct, gs_base): { | |
470 | /* | |
471 | * Exactly the same here as the %fs handling above. | |
472 | */ | |
473 | unsigned int seg = task->thread.gsindex; | |
474 | if (task->thread.gs != 0) | |
475 | return task->thread.gs; | |
476 | if (task == current) | |
477 | asm("movl %%gs,%0" : "=r" (seg)); | |
478 | if (seg != GS_TLS_SEL) | |
479 | return 0; | |
480 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
481 | } | |
482 | #endif | |
06ee1b68 RM |
483 | } |
484 | ||
485 | return *pt_regs_access(task_pt_regs(task), offset); | |
486 | } | |
487 | ||
91e7b707 RM |
488 | static int genregs_get(struct task_struct *target, |
489 | const struct user_regset *regset, | |
490 | unsigned int pos, unsigned int count, | |
491 | void *kbuf, void __user *ubuf) | |
492 | { | |
493 | if (kbuf) { | |
494 | unsigned long *k = kbuf; | |
04a1e62c | 495 | while (count >= sizeof(*k)) { |
91e7b707 RM |
496 | *k++ = getreg(target, pos); |
497 | count -= sizeof(*k); | |
498 | pos += sizeof(*k); | |
499 | } | |
500 | } else { | |
501 | unsigned long __user *u = ubuf; | |
04a1e62c | 502 | while (count >= sizeof(*u)) { |
91e7b707 RM |
503 | if (__put_user(getreg(target, pos), u++)) |
504 | return -EFAULT; | |
505 | count -= sizeof(*u); | |
506 | pos += sizeof(*u); | |
507 | } | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int genregs_set(struct task_struct *target, | |
514 | const struct user_regset *regset, | |
515 | unsigned int pos, unsigned int count, | |
516 | const void *kbuf, const void __user *ubuf) | |
517 | { | |
518 | int ret = 0; | |
519 | if (kbuf) { | |
520 | const unsigned long *k = kbuf; | |
04a1e62c | 521 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
522 | ret = putreg(target, pos, *k++); |
523 | count -= sizeof(*k); | |
524 | pos += sizeof(*k); | |
525 | } | |
526 | } else { | |
527 | const unsigned long __user *u = ubuf; | |
04a1e62c | 528 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
529 | unsigned long word; |
530 | ret = __get_user(word, u++); | |
531 | if (ret) | |
532 | break; | |
533 | ret = putreg(target, pos, word); | |
534 | count -= sizeof(*u); | |
535 | pos += sizeof(*u); | |
536 | } | |
537 | } | |
538 | return ret; | |
539 | } | |
540 | ||
a8b0ca17 | 541 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
542 | struct perf_sample_data *data, |
543 | struct pt_regs *regs) | |
d9771e8c | 544 | { |
0f534093 | 545 | int i; |
24f1e32c | 546 | struct thread_struct *thread = &(current->thread); |
0f534093 | 547 | |
72f674d2 P |
548 | /* |
549 | * Store in the virtual DR6 register the fact that the breakpoint | |
550 | * was hit so the thread's debugger will see it. | |
551 | */ | |
24f1e32c FW |
552 | for (i = 0; i < HBP_NUM; i++) { |
553 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 554 | break; |
24f1e32c | 555 | } |
d9771e8c | 556 | |
72f674d2 P |
557 | thread->debugreg6 |= (DR_TRAP0 << i); |
558 | } | |
d9771e8c | 559 | |
d9771e8c | 560 | /* |
24f1e32c FW |
561 | * Walk through every ptrace breakpoints for this thread and |
562 | * build the dr7 value on top of their attributes. | |
563 | * | |
d9771e8c | 564 | */ |
24f1e32c | 565 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 566 | { |
24f1e32c FW |
567 | int i; |
568 | int dr7 = 0; | |
569 | struct arch_hw_breakpoint *info; | |
570 | ||
571 | for (i = 0; i < HBP_NUM; i++) { | |
572 | if (bp[i] && !bp[i]->attr.disabled) { | |
573 | info = counter_arch_bp(bp[i]); | |
574 | dr7 |= encode_dr7(i, info->len, info->type); | |
575 | } | |
0f534093 | 576 | } |
24f1e32c FW |
577 | |
578 | return dr7; | |
d9771e8c RM |
579 | } |
580 | ||
9afe33ad ON |
581 | static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
582 | int len, int type, bool disabled) | |
583 | { | |
584 | int err, bp_len, bp_type; | |
585 | ||
586 | err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); | |
587 | if (!err) { | |
588 | attr->bp_len = bp_len; | |
589 | attr->bp_type = bp_type; | |
590 | attr->disabled = disabled; | |
591 | } | |
592 | ||
593 | return err; | |
594 | } | |
595 | ||
596 | static struct perf_event * | |
597 | ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, | |
598 | unsigned long addr, bool disabled) | |
5fa10b28 | 599 | { |
b326e956 | 600 | struct perf_event_attr attr; |
9afe33ad ON |
601 | int err; |
602 | ||
603 | ptrace_breakpoint_init(&attr); | |
604 | attr.bp_addr = addr; | |
5fa10b28 | 605 | |
9afe33ad | 606 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
5fa10b28 | 607 | if (err) |
9afe33ad ON |
608 | return ERR_PTR(err); |
609 | ||
610 | return register_user_hw_breakpoint(&attr, ptrace_triggered, | |
611 | NULL, tsk); | |
612 | } | |
613 | ||
614 | static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, | |
615 | int disabled) | |
616 | { | |
617 | struct perf_event_attr attr = bp->attr; | |
618 | int err; | |
5fa10b28 | 619 | |
9afe33ad ON |
620 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
621 | if (err) | |
622 | return err; | |
5fa10b28 | 623 | |
2f0993e0 | 624 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
625 | } |
626 | ||
72f674d2 P |
627 | /* |
628 | * Handle ptrace writes to debug register 7. | |
629 | */ | |
630 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 631 | { |
29a55513 | 632 | struct thread_struct *thread = &tsk->thread; |
24f1e32c | 633 | unsigned long old_dr7; |
29a55513 ON |
634 | bool second_pass = false; |
635 | int i, rc, ret = 0; | |
72f674d2 P |
636 | |
637 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 638 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
29a55513 | 639 | |
72f674d2 | 640 | restore: |
29a55513 | 641 | rc = 0; |
72f674d2 | 642 | for (i = 0; i < HBP_NUM; i++) { |
e6a7d607 ON |
643 | unsigned len, type; |
644 | bool disabled = !decode_dr7(data, i, &len, &type); | |
645 | struct perf_event *bp = thread->ptrace_bps[i]; | |
646 | ||
29a55513 ON |
647 | if (!bp) { |
648 | if (disabled) | |
649 | continue; | |
b87a95ad ON |
650 | |
651 | bp = ptrace_register_breakpoint(tsk, | |
652 | len, type, 0, disabled); | |
653 | if (IS_ERR(bp)) { | |
654 | rc = PTR_ERR(bp); | |
655 | break; | |
656 | } | |
657 | ||
658 | thread->ptrace_bps[i] = bp; | |
659 | continue; | |
72f674d2 | 660 | } |
0f534093 | 661 | |
9afe33ad | 662 | rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
44234adc | 663 | if (rc) |
24f1e32c | 664 | break; |
72f674d2 | 665 | } |
29a55513 ON |
666 | |
667 | /* Restore if the first pass failed, second_pass shouldn't fail. */ | |
668 | if (rc && !WARN_ON(second_pass)) { | |
669 | ret = rc; | |
670 | data = old_dr7; | |
671 | second_pass = true; | |
72f674d2 P |
672 | goto restore; |
673 | } | |
87dc669b | 674 | |
29a55513 | 675 | return ret; |
72f674d2 | 676 | } |
0f534093 | 677 | |
72f674d2 P |
678 | /* |
679 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
680 | */ | |
9d22b536 | 681 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 | 682 | { |
61e305c7 | 683 | struct thread_struct *thread = &tsk->thread; |
72f674d2 P |
684 | unsigned long val = 0; |
685 | ||
24f1e32c | 686 | if (n < HBP_NUM) { |
02be46fb | 687 | struct perf_event *bp = thread->ptrace_bps[n]; |
87dc669b | 688 | |
02be46fb | 689 | if (bp) |
87dc669b | 690 | val = bp->hw.info.address; |
24f1e32c | 691 | } else if (n == 6) { |
72f674d2 | 692 | val = thread->debugreg6; |
61e305c7 | 693 | } else if (n == 7) { |
326264a0 | 694 | val = thread->ptrace_dr7; |
24f1e32c | 695 | } |
72f674d2 P |
696 | return val; |
697 | } | |
0f534093 | 698 | |
24f1e32c FW |
699 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
700 | unsigned long addr) | |
701 | { | |
24f1e32c | 702 | struct thread_struct *t = &tsk->thread; |
9afe33ad | 703 | struct perf_event *bp = t->ptrace_bps[nr]; |
87dc669b FW |
704 | int err = 0; |
705 | ||
9afe33ad | 706 | if (!bp) { |
44234adc | 707 | /* |
9afe33ad ON |
708 | * Put stub len and type to create an inactive but correct bp. |
709 | * | |
44234adc FW |
710 | * CHECKME: the previous code returned -EIO if the addr wasn't |
711 | * a valid task virtual addr. The new one will return -EINVAL in | |
712 | * this case. | |
713 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
714 | * but -EIO looks better for ptrace, since we refuse a register | |
715 | * writing for the user. And anyway this is the previous | |
716 | * behaviour. | |
717 | */ | |
9afe33ad ON |
718 | bp = ptrace_register_breakpoint(tsk, |
719 | X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, | |
720 | addr, true); | |
721 | if (IS_ERR(bp)) | |
87dc669b | 722 | err = PTR_ERR(bp); |
9afe33ad ON |
723 | else |
724 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 725 | } else { |
9afe33ad | 726 | struct perf_event_attr attr = bp->attr; |
5fa10b28 | 727 | |
5fa10b28 | 728 | attr.bp_addr = addr; |
44234adc | 729 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 730 | } |
9afe33ad | 731 | |
87dc669b | 732 | return err; |
d9771e8c RM |
733 | } |
734 | ||
72f674d2 P |
735 | /* |
736 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
737 | */ | |
98b8b99a HS |
738 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
739 | unsigned long val) | |
72f674d2 | 740 | { |
61e305c7 | 741 | struct thread_struct *thread = &tsk->thread; |
72f674d2 | 742 | /* There are no DR4 or DR5 registers */ |
61e305c7 | 743 | int rc = -EIO; |
72f674d2 | 744 | |
72f674d2 | 745 | if (n < HBP_NUM) { |
24f1e32c | 746 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
61e305c7 ON |
747 | } else if (n == 6) { |
748 | thread->debugreg6 = val; | |
749 | rc = 0; | |
750 | } else if (n == 7) { | |
72f674d2 | 751 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
752 | if (!rc) |
753 | thread->ptrace_dr7 = val; | |
754 | } | |
72f674d2 | 755 | return rc; |
d9771e8c RM |
756 | } |
757 | ||
325af5fb RM |
758 | /* |
759 | * These access the current or another (stopped) task's io permission | |
760 | * bitmap for debugging or core dump. | |
761 | */ | |
762 | static int ioperm_active(struct task_struct *target, | |
763 | const struct user_regset *regset) | |
764 | { | |
765 | return target->thread.io_bitmap_max / regset->size; | |
766 | } | |
b4ef95de | 767 | |
325af5fb RM |
768 | static int ioperm_get(struct task_struct *target, |
769 | const struct user_regset *regset, | |
770 | unsigned int pos, unsigned int count, | |
771 | void *kbuf, void __user *ubuf) | |
eee3af4a | 772 | { |
325af5fb | 773 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
774 | return -ENXIO; |
775 | ||
325af5fb RM |
776 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
777 | target->thread.io_bitmap_ptr, | |
778 | 0, IO_BITMAP_BYTES); | |
779 | } | |
780 | ||
1da177e4 LT |
781 | /* |
782 | * Called by kernel/ptrace.c when detaching.. | |
783 | * | |
784 | * Make sure the single step bit is not set. | |
785 | */ | |
786 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 787 | { |
7f232343 | 788 | user_disable_single_step(child); |
e9c86c78 | 789 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 790 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 791 | #endif |
1da177e4 LT |
792 | } |
793 | ||
5a4646a4 RM |
794 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
795 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
796 | #endif | |
797 | ||
9b05a69e NK |
798 | long arch_ptrace(struct task_struct *child, long request, |
799 | unsigned long addr, unsigned long data) | |
1da177e4 | 800 | { |
5a4646a4 | 801 | int ret; |
1da177e4 LT |
802 | unsigned long __user *datap = (unsigned long __user *)data; |
803 | ||
1da177e4 | 804 | switch (request) { |
1da177e4 LT |
805 | /* read the word at location addr in the USER area. */ |
806 | case PTRACE_PEEKUSR: { | |
807 | unsigned long tmp; | |
808 | ||
809 | ret = -EIO; | |
eb5a3699 | 810 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
811 | break; |
812 | ||
813 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 814 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 815 | tmp = getreg(child, addr); |
e9c86c78 RM |
816 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
817 | addr <= offsetof(struct user, u_debugreg[7])) { | |
818 | addr -= offsetof(struct user, u_debugreg[0]); | |
819 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
820 | } |
821 | ret = put_user(tmp, datap); | |
822 | break; | |
823 | } | |
824 | ||
1da177e4 LT |
825 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
826 | ret = -EIO; | |
eb5a3699 | 827 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
828 | break; |
829 | ||
e9c86c78 | 830 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 831 | ret = putreg(child, addr, data); |
e9c86c78 RM |
832 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
833 | addr <= offsetof(struct user, u_debugreg[7])) { | |
834 | addr -= offsetof(struct user, u_debugreg[0]); | |
835 | ret = ptrace_set_debugreg(child, | |
836 | addr / sizeof(data), data); | |
1da177e4 | 837 | } |
e9c86c78 | 838 | break; |
1da177e4 | 839 | |
5a4646a4 RM |
840 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
841 | return copy_regset_to_user(child, | |
842 | task_user_regset_view(current), | |
843 | REGSET_GENERAL, | |
844 | 0, sizeof(struct user_regs_struct), | |
845 | datap); | |
846 | ||
847 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
848 | return copy_regset_from_user(child, | |
849 | task_user_regset_view(current), | |
850 | REGSET_GENERAL, | |
851 | 0, sizeof(struct user_regs_struct), | |
852 | datap); | |
853 | ||
854 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
855 | return copy_regset_to_user(child, | |
856 | task_user_regset_view(current), | |
857 | REGSET_FP, | |
858 | 0, sizeof(struct user_i387_struct), | |
859 | datap); | |
860 | ||
861 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
862 | return copy_regset_from_user(child, | |
863 | task_user_regset_view(current), | |
864 | REGSET_FP, | |
865 | 0, sizeof(struct user_i387_struct), | |
866 | datap); | |
1da177e4 | 867 | |
e9c86c78 | 868 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
869 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
870 | return copy_regset_to_user(child, &user_x86_32_view, | |
871 | REGSET_XFP, | |
872 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 873 | datap) ? -EIO : 0; |
5a4646a4 RM |
874 | |
875 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
876 | return copy_regset_from_user(child, &user_x86_32_view, | |
877 | REGSET_XFP, | |
878 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 879 | datap) ? -EIO : 0; |
e9c86c78 | 880 | #endif |
1da177e4 | 881 | |
e9c86c78 | 882 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 883 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 884 | if ((int) addr < 0) |
efd1ca52 RM |
885 | return -EIO; |
886 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 887 | (struct user_desc __user *)data); |
1da177e4 LT |
888 | break; |
889 | ||
890 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 891 | if ((int) addr < 0) |
efd1ca52 RM |
892 | return -EIO; |
893 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 894 | (struct user_desc __user *)data, 0); |
1da177e4 | 895 | break; |
e9c86c78 RM |
896 | #endif |
897 | ||
898 | #ifdef CONFIG_X86_64 | |
899 | /* normal 64bit interface to access TLS data. | |
900 | Works just like arch_prctl, except that the arguments | |
901 | are reversed. */ | |
902 | case PTRACE_ARCH_PRCTL: | |
903 | ret = do_arch_prctl(child, data, addr); | |
904 | break; | |
905 | #endif | |
1da177e4 LT |
906 | |
907 | default: | |
908 | ret = ptrace_request(child, request, addr, data); | |
909 | break; | |
910 | } | |
d9771e8c | 911 | |
1da177e4 LT |
912 | return ret; |
913 | } | |
914 | ||
cb757c41 RM |
915 | #ifdef CONFIG_IA32_EMULATION |
916 | ||
099cd6e9 RM |
917 | #include <linux/compat.h> |
918 | #include <linux/syscalls.h> | |
919 | #include <asm/ia32.h> | |
cb757c41 RM |
920 | #include <asm/user32.h> |
921 | ||
922 | #define R32(l,q) \ | |
923 | case offsetof(struct user32, regs.l): \ | |
924 | regs->q = value; break | |
925 | ||
926 | #define SEG32(rs) \ | |
927 | case offsetof(struct user32, regs.rs): \ | |
928 | return set_segment_reg(child, \ | |
929 | offsetof(struct user_regs_struct, rs), \ | |
930 | value); \ | |
931 | break | |
932 | ||
933 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
934 | { | |
935 | struct pt_regs *regs = task_pt_regs(child); | |
936 | ||
937 | switch (regno) { | |
938 | ||
939 | SEG32(cs); | |
940 | SEG32(ds); | |
941 | SEG32(es); | |
942 | SEG32(fs); | |
943 | SEG32(gs); | |
944 | SEG32(ss); | |
945 | ||
946 | R32(ebx, bx); | |
947 | R32(ecx, cx); | |
948 | R32(edx, dx); | |
949 | R32(edi, di); | |
950 | R32(esi, si); | |
951 | R32(ebp, bp); | |
952 | R32(eax, ax); | |
cb757c41 RM |
953 | R32(eip, ip); |
954 | R32(esp, sp); | |
955 | ||
40f0933d RM |
956 | case offsetof(struct user32, regs.orig_eax): |
957 | /* | |
8cb3ed13 RM |
958 | * A 32-bit debugger setting orig_eax means to restore |
959 | * the state of the task restarting a 32-bit syscall. | |
960 | * Make sure we interpret the -ERESTART* codes correctly | |
961 | * in case the task is not actually still sitting at the | |
962 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 963 | */ |
8cb3ed13 RM |
964 | regs->orig_ax = value; |
965 | if (syscall_get_nr(child, regs) >= 0) | |
966 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
967 | break; |
968 | ||
cb757c41 RM |
969 | case offsetof(struct user32, regs.eflags): |
970 | return set_flags(child, value); | |
971 | ||
972 | case offsetof(struct user32, u_debugreg[0]) ... | |
973 | offsetof(struct user32, u_debugreg[7]): | |
974 | regno -= offsetof(struct user32, u_debugreg[0]); | |
975 | return ptrace_set_debugreg(child, regno / 4, value); | |
976 | ||
977 | default: | |
978 | if (regno > sizeof(struct user32) || (regno & 3)) | |
979 | return -EIO; | |
980 | ||
981 | /* | |
982 | * Other dummy fields in the virtual user structure | |
983 | * are ignored | |
984 | */ | |
985 | break; | |
986 | } | |
987 | return 0; | |
988 | } | |
989 | ||
990 | #undef R32 | |
991 | #undef SEG32 | |
992 | ||
993 | #define R32(l,q) \ | |
994 | case offsetof(struct user32, regs.l): \ | |
995 | *val = regs->q; break | |
996 | ||
997 | #define SEG32(rs) \ | |
998 | case offsetof(struct user32, regs.rs): \ | |
999 | *val = get_segment_reg(child, \ | |
1000 | offsetof(struct user_regs_struct, rs)); \ | |
1001 | break | |
1002 | ||
1003 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1004 | { | |
1005 | struct pt_regs *regs = task_pt_regs(child); | |
1006 | ||
1007 | switch (regno) { | |
1008 | ||
1009 | SEG32(ds); | |
1010 | SEG32(es); | |
1011 | SEG32(fs); | |
1012 | SEG32(gs); | |
1013 | ||
1014 | R32(cs, cs); | |
1015 | R32(ss, ss); | |
1016 | R32(ebx, bx); | |
1017 | R32(ecx, cx); | |
1018 | R32(edx, dx); | |
1019 | R32(edi, di); | |
1020 | R32(esi, si); | |
1021 | R32(ebp, bp); | |
1022 | R32(eax, ax); | |
1023 | R32(orig_eax, orig_ax); | |
1024 | R32(eip, ip); | |
1025 | R32(esp, sp); | |
1026 | ||
1027 | case offsetof(struct user32, regs.eflags): | |
1028 | *val = get_flags(child); | |
1029 | break; | |
1030 | ||
1031 | case offsetof(struct user32, u_debugreg[0]) ... | |
1032 | offsetof(struct user32, u_debugreg[7]): | |
1033 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1034 | *val = ptrace_get_debugreg(child, regno / 4); | |
1035 | break; | |
1036 | ||
1037 | default: | |
1038 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1039 | return -EIO; | |
1040 | ||
1041 | /* | |
1042 | * Other dummy fields in the virtual user structure | |
1043 | * are ignored | |
1044 | */ | |
1045 | *val = 0; | |
1046 | break; | |
1047 | } | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | #undef R32 | |
1052 | #undef SEG32 | |
1053 | ||
91e7b707 RM |
1054 | static int genregs32_get(struct task_struct *target, |
1055 | const struct user_regset *regset, | |
1056 | unsigned int pos, unsigned int count, | |
1057 | void *kbuf, void __user *ubuf) | |
1058 | { | |
1059 | if (kbuf) { | |
1060 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1061 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1062 | getreg32(target, pos, k++); |
1063 | count -= sizeof(*k); | |
1064 | pos += sizeof(*k); | |
1065 | } | |
1066 | } else { | |
1067 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1068 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1069 | compat_ulong_t word; |
1070 | getreg32(target, pos, &word); | |
1071 | if (__put_user(word, u++)) | |
1072 | return -EFAULT; | |
1073 | count -= sizeof(*u); | |
1074 | pos += sizeof(*u); | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static int genregs32_set(struct task_struct *target, | |
1082 | const struct user_regset *regset, | |
1083 | unsigned int pos, unsigned int count, | |
1084 | const void *kbuf, const void __user *ubuf) | |
1085 | { | |
1086 | int ret = 0; | |
1087 | if (kbuf) { | |
1088 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1089 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1090 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1091 | count -= sizeof(*k); |
1092 | pos += sizeof(*k); | |
1093 | } | |
1094 | } else { | |
1095 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1096 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1097 | compat_ulong_t word; |
1098 | ret = __get_user(word, u++); | |
1099 | if (ret) | |
1100 | break; | |
f9cb02b0 | 1101 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1102 | count -= sizeof(*u); |
1103 | pos += sizeof(*u); | |
1104 | } | |
1105 | } | |
1106 | return ret; | |
1107 | } | |
1108 | ||
601275c3 BG |
1109 | static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request, |
1110 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1111 | { | |
1112 | unsigned long addr = caddr; | |
1113 | unsigned long data = cdata; | |
1114 | void __user *datap = compat_ptr(data); | |
1115 | int ret; | |
1116 | __u32 val; | |
1117 | ||
1118 | switch (request) { | |
1119 | case PTRACE_PEEKUSR: | |
1120 | ret = getreg32(child, addr, &val); | |
1121 | if (ret == 0) | |
1122 | ret = put_user(val, (__u32 __user *)datap); | |
1123 | break; | |
1124 | ||
1125 | case PTRACE_POKEUSR: | |
1126 | ret = putreg32(child, addr, data); | |
1127 | break; | |
1128 | ||
1129 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1130 | return copy_regset_to_user(child, &user_x86_32_view, | |
1131 | REGSET_GENERAL, | |
1132 | 0, sizeof(struct user_regs_struct32), | |
1133 | datap); | |
1134 | ||
1135 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1136 | return copy_regset_from_user(child, &user_x86_32_view, | |
1137 | REGSET_GENERAL, 0, | |
1138 | sizeof(struct user_regs_struct32), | |
1139 | datap); | |
1140 | ||
1141 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1142 | return copy_regset_to_user(child, &user_x86_32_view, | |
1143 | REGSET_FP, 0, | |
1144 | sizeof(struct user_i387_ia32_struct), | |
1145 | datap); | |
1146 | ||
1147 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1148 | return copy_regset_from_user( | |
1149 | child, &user_x86_32_view, REGSET_FP, | |
1150 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1151 | ||
1152 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1153 | return copy_regset_to_user(child, &user_x86_32_view, | |
1154 | REGSET_XFP, 0, | |
1155 | sizeof(struct user32_fxsr_struct), | |
1156 | datap); | |
1157 | ||
1158 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1159 | return copy_regset_from_user(child, &user_x86_32_view, | |
1160 | REGSET_XFP, 0, | |
1161 | sizeof(struct user32_fxsr_struct), | |
1162 | datap); | |
1163 | ||
1164 | case PTRACE_GET_THREAD_AREA: | |
1165 | case PTRACE_SET_THREAD_AREA: | |
1166 | return arch_ptrace(child, request, addr, data); | |
1167 | ||
1168 | default: | |
1169 | return compat_ptrace_request(child, request, addr, data); | |
1170 | } | |
1171 | ||
1172 | return ret; | |
1173 | } | |
1174 | #endif /* CONFIG_IA32_EMULATION */ | |
1175 | ||
55283e25 L |
1176 | #ifdef CONFIG_X86_X32_ABI |
1177 | static long x32_arch_ptrace(struct task_struct *child, | |
1178 | compat_long_t request, compat_ulong_t caddr, | |
1179 | compat_ulong_t cdata) | |
1180 | { | |
1181 | unsigned long addr = caddr; | |
1182 | unsigned long data = cdata; | |
1183 | void __user *datap = compat_ptr(data); | |
1184 | int ret; | |
1185 | ||
1186 | switch (request) { | |
1187 | /* Read 32bits at location addr in the USER area. Only allow | |
1188 | to return the lower 32bits of segment and debug registers. */ | |
1189 | case PTRACE_PEEKUSR: { | |
1190 | u32 tmp; | |
1191 | ||
1192 | ret = -EIO; | |
1193 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1194 | addr < offsetof(struct user_regs_struct, cs)) | |
1195 | break; | |
1196 | ||
1197 | tmp = 0; /* Default return condition */ | |
1198 | if (addr < sizeof(struct user_regs_struct)) | |
1199 | tmp = getreg(child, addr); | |
1200 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1201 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1202 | addr -= offsetof(struct user, u_debugreg[0]); | |
1203 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1204 | } | |
1205 | ret = put_user(tmp, (__u32 __user *)datap); | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | /* Write the word at location addr in the USER area. Only allow | |
1210 | to update segment and debug registers with the upper 32bits | |
1211 | zero-extended. */ | |
1212 | case PTRACE_POKEUSR: | |
1213 | ret = -EIO; | |
1214 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1215 | addr < offsetof(struct user_regs_struct, cs)) | |
1216 | break; | |
1217 | ||
1218 | if (addr < sizeof(struct user_regs_struct)) | |
1219 | ret = putreg(child, addr, data); | |
1220 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1221 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1222 | addr -= offsetof(struct user, u_debugreg[0]); | |
1223 | ret = ptrace_set_debugreg(child, | |
1224 | addr / sizeof(data), data); | |
1225 | } | |
1226 | break; | |
1227 | ||
1228 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1229 | return copy_regset_to_user(child, | |
1230 | task_user_regset_view(current), | |
1231 | REGSET_GENERAL, | |
1232 | 0, sizeof(struct user_regs_struct), | |
1233 | datap); | |
1234 | ||
1235 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1236 | return copy_regset_from_user(child, | |
1237 | task_user_regset_view(current), | |
1238 | REGSET_GENERAL, | |
1239 | 0, sizeof(struct user_regs_struct), | |
1240 | datap); | |
1241 | ||
1242 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1243 | return copy_regset_to_user(child, | |
1244 | task_user_regset_view(current), | |
1245 | REGSET_FP, | |
1246 | 0, sizeof(struct user_i387_struct), | |
1247 | datap); | |
1248 | ||
1249 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1250 | return copy_regset_from_user(child, | |
1251 | task_user_regset_view(current), | |
1252 | REGSET_FP, | |
1253 | 0, sizeof(struct user_i387_struct), | |
1254 | datap); | |
1255 | ||
55283e25 L |
1256 | default: |
1257 | return compat_ptrace_request(child, request, addr, data); | |
1258 | } | |
1259 | ||
1260 | return ret; | |
1261 | } | |
1262 | #endif | |
1263 | ||
601275c3 | 1264 | #ifdef CONFIG_COMPAT |
562b80ba RM |
1265 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1266 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1267 | { |
55283e25 L |
1268 | #ifdef CONFIG_X86_X32_ABI |
1269 | if (!is_ia32_task()) | |
1270 | return x32_arch_ptrace(child, request, caddr, cdata); | |
1271 | #endif | |
601275c3 BG |
1272 | #ifdef CONFIG_IA32_EMULATION |
1273 | return ia32_arch_ptrace(child, request, caddr, cdata); | |
1274 | #else | |
1275 | return 0; | |
1276 | #endif | |
099cd6e9 | 1277 | } |
601275c3 | 1278 | #endif /* CONFIG_COMPAT */ |
cb757c41 | 1279 | |
070459d9 RM |
1280 | #ifdef CONFIG_X86_64 |
1281 | ||
5b3efd50 | 1282 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1283 | [REGSET_GENERAL] = { |
1284 | .core_note_type = NT_PRSTATUS, | |
1285 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1286 | .size = sizeof(long), .align = sizeof(long), | |
1287 | .get = genregs_get, .set = genregs_set | |
1288 | }, | |
1289 | [REGSET_FP] = { | |
1290 | .core_note_type = NT_PRFPREG, | |
1291 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1292 | .size = sizeof(long), .align = sizeof(long), | |
678eaf60 | 1293 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1294 | }, |
5b3efd50 SS |
1295 | [REGSET_XSTATE] = { |
1296 | .core_note_type = NT_X86_XSTATE, | |
1297 | .size = sizeof(u64), .align = sizeof(u64), | |
1298 | .active = xstateregs_active, .get = xstateregs_get, | |
1299 | .set = xstateregs_set | |
1300 | }, | |
325af5fb RM |
1301 | [REGSET_IOPERM64] = { |
1302 | .core_note_type = NT_386_IOPERM, | |
1303 | .n = IO_BITMAP_LONGS, | |
1304 | .size = sizeof(long), .align = sizeof(long), | |
1305 | .active = ioperm_active, .get = ioperm_get | |
1306 | }, | |
070459d9 RM |
1307 | }; |
1308 | ||
1309 | static const struct user_regset_view user_x86_64_view = { | |
1310 | .name = "x86_64", .e_machine = EM_X86_64, | |
1311 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1312 | }; | |
1313 | ||
1314 | #else /* CONFIG_X86_32 */ | |
1315 | ||
1316 | #define user_regs_struct32 user_regs_struct | |
1317 | #define genregs32_get genregs_get | |
1318 | #define genregs32_set genregs_set | |
1319 | ||
1320 | #endif /* CONFIG_X86_64 */ | |
1321 | ||
1322 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1323 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1324 | [REGSET_GENERAL] = { |
1325 | .core_note_type = NT_PRSTATUS, | |
1326 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1327 | .size = sizeof(u32), .align = sizeof(u32), | |
1328 | .get = genregs32_get, .set = genregs32_set | |
1329 | }, | |
1330 | [REGSET_FP] = { | |
1331 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1332 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 | 1333 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1334 | .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set |
070459d9 RM |
1335 | }, |
1336 | [REGSET_XFP] = { | |
1337 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1338 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 | 1339 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1340 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1341 | }, |
5b3efd50 SS |
1342 | [REGSET_XSTATE] = { |
1343 | .core_note_type = NT_X86_XSTATE, | |
1344 | .size = sizeof(u64), .align = sizeof(u64), | |
1345 | .active = xstateregs_active, .get = xstateregs_get, | |
1346 | .set = xstateregs_set | |
1347 | }, | |
070459d9 | 1348 | [REGSET_TLS] = { |
bb61682b | 1349 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1350 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1351 | .size = sizeof(struct user_desc), | |
1352 | .align = sizeof(struct user_desc), | |
1353 | .active = regset_tls_active, | |
1354 | .get = regset_tls_get, .set = regset_tls_set | |
1355 | }, | |
325af5fb RM |
1356 | [REGSET_IOPERM32] = { |
1357 | .core_note_type = NT_386_IOPERM, | |
1358 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1359 | .size = sizeof(u32), .align = sizeof(u32), | |
1360 | .active = ioperm_active, .get = ioperm_get | |
1361 | }, | |
070459d9 RM |
1362 | }; |
1363 | ||
1364 | static const struct user_regset_view user_x86_32_view = { | |
1365 | .name = "i386", .e_machine = EM_386, | |
1366 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1367 | }; | |
1368 | #endif | |
1369 | ||
5b3efd50 SS |
1370 | /* |
1371 | * This represents bytes 464..511 in the memory layout exported through | |
1372 | * the REGSET_XSTATE interface. | |
1373 | */ | |
1374 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1375 | ||
1376 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1377 | { | |
1378 | #ifdef CONFIG_X86_64 | |
1379 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1380 | #endif | |
1381 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1382 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1383 | #endif | |
1384 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1385 | } | |
1386 | ||
070459d9 RM |
1387 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1388 | { | |
1389 | #ifdef CONFIG_IA32_EMULATION | |
1390 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1391 | #endif | |
1392 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1393 | return &user_x86_32_view; | |
1394 | #endif | |
1395 | #ifdef CONFIG_X86_64 | |
1396 | return &user_x86_64_view; | |
1397 | #endif | |
1398 | } | |
1399 | ||
7f38551f ON |
1400 | static void fill_sigtrap_info(struct task_struct *tsk, |
1401 | struct pt_regs *regs, | |
1402 | int error_code, int si_code, | |
1403 | struct siginfo *info) | |
1da177e4 | 1404 | { |
51e7dc70 | 1405 | tsk->thread.trap_nr = X86_TRAP_DB; |
1da177e4 LT |
1406 | tsk->thread.error_code = error_code; |
1407 | ||
7f38551f ON |
1408 | memset(info, 0, sizeof(*info)); |
1409 | info->si_signo = SIGTRAP; | |
1410 | info->si_code = si_code; | |
f39b6f0e | 1411 | info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
7f38551f ON |
1412 | } |
1413 | ||
1414 | void user_single_step_siginfo(struct task_struct *tsk, | |
1415 | struct pt_regs *regs, | |
1416 | struct siginfo *info) | |
1417 | { | |
1418 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1419 | } | |
1da177e4 | 1420 | |
7f38551f ON |
1421 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1422 | int error_code, int si_code) | |
1423 | { | |
1424 | struct siginfo info; | |
1da177e4 | 1425 | |
7f38551f | 1426 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1427 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1428 | force_sig_info(SIGTRAP, &info, tsk); |
1429 | } |