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1da177e4 LT |
1 | /* By Ross Biro 1/23/92 */ |
2 | /* | |
3 | * Pentium III FXSR, SSE support | |
4 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/smp.h> | |
1da177e4 | 11 | #include <linux/errno.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <linux/ptrace.h> |
91e7b707 | 14 | #include <linux/regset.h> |
eeea3c3f | 15 | #include <linux/tracehook.h> |
1da177e4 | 16 | #include <linux/user.h> |
070459d9 | 17 | #include <linux/elf.h> |
1da177e4 LT |
18 | #include <linux/security.h> |
19 | #include <linux/audit.h> | |
20 | #include <linux/seccomp.h> | |
7ed20e1a | 21 | #include <linux/signal.h> |
24f1e32c FW |
22 | #include <linux/perf_event.h> |
23 | #include <linux/hw_breakpoint.h> | |
bf5a3c13 | 24 | #include <linux/rcupdate.h> |
19348e74 | 25 | #include <linux/export.h> |
91d1aa43 | 26 | #include <linux/context_tracking.h> |
1da177e4 LT |
27 | |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/pgtable.h> | |
1da177e4 LT |
30 | #include <asm/processor.h> |
31 | #include <asm/i387.h> | |
1361b83a | 32 | #include <asm/fpu-internal.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> |
eee3af4a | 40 | |
070459d9 RM |
41 | #include "tls.h" |
42 | ||
1c569f02 JS |
43 | #define CREATE_TRACE_POINTS |
44 | #include <trace/events/syscalls.h> | |
45 | ||
070459d9 RM |
46 | enum x86_regset { |
47 | REGSET_GENERAL, | |
48 | REGSET_FP, | |
49 | REGSET_XFP, | |
325af5fb | 50 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 51 | REGSET_XSTATE, |
070459d9 | 52 | REGSET_TLS, |
325af5fb | 53 | REGSET_IOPERM32, |
070459d9 | 54 | }; |
eee3af4a | 55 | |
b1cf540f MH |
56 | struct pt_regs_offset { |
57 | const char *name; | |
58 | int offset; | |
59 | }; | |
60 | ||
61 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
62 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
63 | ||
64 | static const struct pt_regs_offset regoffset_table[] = { | |
65 | #ifdef CONFIG_X86_64 | |
66 | REG_OFFSET_NAME(r15), | |
67 | REG_OFFSET_NAME(r14), | |
68 | REG_OFFSET_NAME(r13), | |
69 | REG_OFFSET_NAME(r12), | |
70 | REG_OFFSET_NAME(r11), | |
71 | REG_OFFSET_NAME(r10), | |
72 | REG_OFFSET_NAME(r9), | |
73 | REG_OFFSET_NAME(r8), | |
74 | #endif | |
75 | REG_OFFSET_NAME(bx), | |
76 | REG_OFFSET_NAME(cx), | |
77 | REG_OFFSET_NAME(dx), | |
78 | REG_OFFSET_NAME(si), | |
79 | REG_OFFSET_NAME(di), | |
80 | REG_OFFSET_NAME(bp), | |
81 | REG_OFFSET_NAME(ax), | |
82 | #ifdef CONFIG_X86_32 | |
83 | REG_OFFSET_NAME(ds), | |
84 | REG_OFFSET_NAME(es), | |
85 | REG_OFFSET_NAME(fs), | |
86 | REG_OFFSET_NAME(gs), | |
87 | #endif | |
88 | REG_OFFSET_NAME(orig_ax), | |
89 | REG_OFFSET_NAME(ip), | |
90 | REG_OFFSET_NAME(cs), | |
91 | REG_OFFSET_NAME(flags), | |
92 | REG_OFFSET_NAME(sp), | |
93 | REG_OFFSET_NAME(ss), | |
94 | REG_OFFSET_END, | |
95 | }; | |
96 | ||
97 | /** | |
98 | * regs_query_register_offset() - query register offset from its name | |
99 | * @name: the name of a register | |
100 | * | |
101 | * regs_query_register_offset() returns the offset of a register in struct | |
102 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
103 | */ | |
104 | int regs_query_register_offset(const char *name) | |
105 | { | |
106 | const struct pt_regs_offset *roff; | |
107 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
108 | if (!strcmp(roff->name, name)) | |
109 | return roff->offset; | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | /** | |
114 | * regs_query_register_name() - query register name from its offset | |
115 | * @offset: the offset of a register in struct pt_regs. | |
116 | * | |
117 | * regs_query_register_name() returns the name of a register from its | |
118 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
119 | */ | |
120 | const char *regs_query_register_name(unsigned int offset) | |
121 | { | |
122 | const struct pt_regs_offset *roff; | |
123 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
124 | if (roff->offset == offset) | |
125 | return roff->name; | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static const int arg_offs_table[] = { | |
130 | #ifdef CONFIG_X86_32 | |
131 | [0] = offsetof(struct pt_regs, ax), | |
132 | [1] = offsetof(struct pt_regs, dx), | |
133 | [2] = offsetof(struct pt_regs, cx) | |
134 | #else /* CONFIG_X86_64 */ | |
135 | [0] = offsetof(struct pt_regs, di), | |
136 | [1] = offsetof(struct pt_regs, si), | |
137 | [2] = offsetof(struct pt_regs, dx), | |
138 | [3] = offsetof(struct pt_regs, cx), | |
139 | [4] = offsetof(struct pt_regs, r8), | |
140 | [5] = offsetof(struct pt_regs, r9) | |
141 | #endif | |
142 | }; | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * does not yet catch signals sent when the child dies. | |
146 | * in exit.c or in signal.c. | |
147 | */ | |
148 | ||
9f155b98 CE |
149 | /* |
150 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 151 | */ |
e39c2891 RM |
152 | #define FLAG_MASK_32 ((unsigned long) \ |
153 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
154 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
155 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
156 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
157 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
158 | ||
2047b08b RM |
159 | /* |
160 | * Determines whether a value may be installed in a segment register. | |
161 | */ | |
162 | static inline bool invalid_selector(u16 value) | |
163 | { | |
164 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
165 | } | |
166 | ||
167 | #ifdef CONFIG_X86_32 | |
168 | ||
e39c2891 | 169 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 170 | |
10226238 RR |
171 | /* |
172 | * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode | |
173 | * when it traps. The previous stack will be directly underneath the saved | |
174 | * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. | |
175 | * | |
176 | * Now, if the stack is empty, '®s->sp' is out of range. In this | |
177 | * case we try to take the previous stack. To always return a non-null | |
178 | * stack pointer we fall back to regs as stack if no previous stack | |
179 | * exists. | |
180 | * | |
181 | * This is valid only for kernel mode traps. | |
182 | */ | |
183 | unsigned long kernel_stack_pointer(struct pt_regs *regs) | |
184 | { | |
185 | unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1); | |
186 | unsigned long sp = (unsigned long)®s->sp; | |
0788aa6a | 187 | u32 *prev_esp; |
10226238 RR |
188 | |
189 | if (context == (sp & ~(THREAD_SIZE - 1))) | |
190 | return sp; | |
191 | ||
198d208d | 192 | prev_esp = (u32 *)(context); |
0788aa6a SR |
193 | if (prev_esp) |
194 | return (unsigned long)prev_esp; | |
10226238 RR |
195 | |
196 | return (unsigned long)regs; | |
197 | } | |
cb57a2b4 | 198 | EXPORT_SYMBOL_GPL(kernel_stack_pointer); |
10226238 | 199 | |
4fe702c7 | 200 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 201 | { |
65ea5b03 | 202 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 203 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
204 | } |
205 | ||
06ee1b68 | 206 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 207 | { |
06ee1b68 RM |
208 | /* |
209 | * Returning the value truncates it to 16 bits. | |
210 | */ | |
211 | unsigned int retval; | |
212 | if (offset != offsetof(struct user_regs_struct, gs)) | |
213 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
214 | else { | |
06ee1b68 | 215 | if (task == current) |
d9a89a26 TH |
216 | retval = get_user_gs(task_pt_regs(task)); |
217 | else | |
218 | retval = task_user_gs(task); | |
06ee1b68 RM |
219 | } |
220 | return retval; | |
221 | } | |
222 | ||
223 | static int set_segment_reg(struct task_struct *task, | |
224 | unsigned long offset, u16 value) | |
225 | { | |
226 | /* | |
227 | * The value argument was already truncated to 16 bits. | |
228 | */ | |
2047b08b | 229 | if (invalid_selector(value)) |
06ee1b68 RM |
230 | return -EIO; |
231 | ||
c63855d0 RM |
232 | /* |
233 | * For %cs and %ss we cannot permit a null selector. | |
234 | * We can permit a bogus selector as long as it has USER_RPL. | |
235 | * Null selectors are fine for other segment registers, but | |
236 | * we will never get back to user mode with invalid %cs or %ss | |
237 | * and will take the trap in iret instead. Much code relies | |
238 | * on user_mode() to distinguish a user trap frame (which can | |
239 | * safely use invalid selectors) from a kernel trap frame. | |
240 | */ | |
241 | switch (offset) { | |
242 | case offsetof(struct user_regs_struct, cs): | |
243 | case offsetof(struct user_regs_struct, ss): | |
244 | if (unlikely(value == 0)) | |
245 | return -EIO; | |
246 | ||
247 | default: | |
06ee1b68 | 248 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
249 | break; |
250 | ||
251 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 252 | if (task == current) |
d9a89a26 TH |
253 | set_user_gs(task_pt_regs(task), value); |
254 | else | |
255 | task_user_gs(task) = value; | |
1da177e4 | 256 | } |
06ee1b68 | 257 | |
1da177e4 LT |
258 | return 0; |
259 | } | |
260 | ||
2047b08b RM |
261 | #else /* CONFIG_X86_64 */ |
262 | ||
263 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
264 | ||
265 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
266 | { | |
267 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
268 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
269 | } | |
270 | ||
271 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
272 | { | |
273 | /* | |
274 | * Returning the value truncates it to 16 bits. | |
275 | */ | |
276 | unsigned int seg; | |
277 | ||
278 | switch (offset) { | |
279 | case offsetof(struct user_regs_struct, fs): | |
280 | if (task == current) { | |
281 | /* Older gas can't assemble movq %?s,%r?? */ | |
282 | asm("movl %%fs,%0" : "=r" (seg)); | |
283 | return seg; | |
284 | } | |
285 | return task->thread.fsindex; | |
286 | case offsetof(struct user_regs_struct, gs): | |
287 | if (task == current) { | |
288 | asm("movl %%gs,%0" : "=r" (seg)); | |
289 | return seg; | |
290 | } | |
291 | return task->thread.gsindex; | |
292 | case offsetof(struct user_regs_struct, ds): | |
293 | if (task == current) { | |
294 | asm("movl %%ds,%0" : "=r" (seg)); | |
295 | return seg; | |
296 | } | |
297 | return task->thread.ds; | |
298 | case offsetof(struct user_regs_struct, es): | |
299 | if (task == current) { | |
300 | asm("movl %%es,%0" : "=r" (seg)); | |
301 | return seg; | |
302 | } | |
303 | return task->thread.es; | |
304 | ||
305 | case offsetof(struct user_regs_struct, cs): | |
306 | case offsetof(struct user_regs_struct, ss): | |
307 | break; | |
308 | } | |
309 | return *pt_regs_access(task_pt_regs(task), offset); | |
310 | } | |
311 | ||
312 | static int set_segment_reg(struct task_struct *task, | |
313 | unsigned long offset, u16 value) | |
314 | { | |
315 | /* | |
316 | * The value argument was already truncated to 16 bits. | |
317 | */ | |
318 | if (invalid_selector(value)) | |
319 | return -EIO; | |
320 | ||
321 | switch (offset) { | |
322 | case offsetof(struct user_regs_struct,fs): | |
323 | /* | |
324 | * If this is setting fs as for normal 64-bit use but | |
325 | * setting fs_base has implicitly changed it, leave it. | |
326 | */ | |
327 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
328 | task->thread.fs != 0) || | |
329 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
330 | task->thread.fs == 0)) | |
331 | break; | |
332 | task->thread.fsindex = value; | |
333 | if (task == current) | |
334 | loadsegment(fs, task->thread.fsindex); | |
335 | break; | |
336 | case offsetof(struct user_regs_struct,gs): | |
337 | /* | |
338 | * If this is setting gs as for normal 64-bit use but | |
339 | * setting gs_base has implicitly changed it, leave it. | |
340 | */ | |
341 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
342 | task->thread.gs != 0) || | |
343 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
344 | task->thread.gs == 0)) | |
345 | break; | |
346 | task->thread.gsindex = value; | |
347 | if (task == current) | |
348 | load_gs_index(task->thread.gsindex); | |
349 | break; | |
350 | case offsetof(struct user_regs_struct,ds): | |
351 | task->thread.ds = value; | |
352 | if (task == current) | |
353 | loadsegment(ds, task->thread.ds); | |
354 | break; | |
355 | case offsetof(struct user_regs_struct,es): | |
356 | task->thread.es = value; | |
357 | if (task == current) | |
358 | loadsegment(es, task->thread.es); | |
359 | break; | |
360 | ||
361 | /* | |
362 | * Can't actually change these in 64-bit mode. | |
363 | */ | |
364 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
365 | if (unlikely(value == 0)) |
366 | return -EIO; | |
2047b08b RM |
367 | #ifdef CONFIG_IA32_EMULATION |
368 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
369 | task_pt_regs(task)->cs = value; | |
2047b08b | 370 | #endif |
cb757c41 | 371 | break; |
2047b08b | 372 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
373 | if (unlikely(value == 0)) |
374 | return -EIO; | |
2047b08b RM |
375 | #ifdef CONFIG_IA32_EMULATION |
376 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
377 | task_pt_regs(task)->ss = value; | |
2047b08b | 378 | #endif |
cb757c41 | 379 | break; |
2047b08b RM |
380 | } |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
2047b08b RM |
385 | #endif /* CONFIG_X86_32 */ |
386 | ||
06ee1b68 | 387 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 388 | { |
06ee1b68 RM |
389 | unsigned long retval = task_pt_regs(task)->flags; |
390 | ||
391 | /* | |
392 | * If the debugger set TF, hide it from the readout. | |
393 | */ | |
394 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
395 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 396 | |
1da177e4 LT |
397 | return retval; |
398 | } | |
399 | ||
06ee1b68 RM |
400 | static int set_flags(struct task_struct *task, unsigned long value) |
401 | { | |
402 | struct pt_regs *regs = task_pt_regs(task); | |
403 | ||
404 | /* | |
405 | * If the user value contains TF, mark that | |
406 | * it was not "us" (the debugger) that set it. | |
407 | * If not, make sure it stays set if we had. | |
408 | */ | |
409 | if (value & X86_EFLAGS_TF) | |
410 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
411 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
412 | value |= X86_EFLAGS_TF; | |
413 | ||
414 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static int putreg(struct task_struct *child, | |
420 | unsigned long offset, unsigned long value) | |
421 | { | |
422 | switch (offset) { | |
423 | case offsetof(struct user_regs_struct, cs): | |
424 | case offsetof(struct user_regs_struct, ds): | |
425 | case offsetof(struct user_regs_struct, es): | |
426 | case offsetof(struct user_regs_struct, fs): | |
427 | case offsetof(struct user_regs_struct, gs): | |
428 | case offsetof(struct user_regs_struct, ss): | |
429 | return set_segment_reg(child, offset, value); | |
430 | ||
431 | case offsetof(struct user_regs_struct, flags): | |
432 | return set_flags(child, value); | |
2047b08b RM |
433 | |
434 | #ifdef CONFIG_X86_64 | |
435 | case offsetof(struct user_regs_struct,fs_base): | |
436 | if (value >= TASK_SIZE_OF(child)) | |
437 | return -EIO; | |
438 | /* | |
439 | * When changing the segment base, use do_arch_prctl | |
440 | * to set either thread.fs or thread.fsindex and the | |
441 | * corresponding GDT slot. | |
442 | */ | |
443 | if (child->thread.fs != value) | |
444 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
445 | return 0; | |
446 | case offsetof(struct user_regs_struct,gs_base): | |
447 | /* | |
448 | * Exactly the same here as the %fs handling above. | |
449 | */ | |
450 | if (value >= TASK_SIZE_OF(child)) | |
451 | return -EIO; | |
452 | if (child->thread.gs != value) | |
453 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
454 | return 0; | |
455 | #endif | |
06ee1b68 RM |
456 | } |
457 | ||
458 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
463 | { | |
464 | switch (offset) { | |
465 | case offsetof(struct user_regs_struct, cs): | |
466 | case offsetof(struct user_regs_struct, ds): | |
467 | case offsetof(struct user_regs_struct, es): | |
468 | case offsetof(struct user_regs_struct, fs): | |
469 | case offsetof(struct user_regs_struct, gs): | |
470 | case offsetof(struct user_regs_struct, ss): | |
471 | return get_segment_reg(task, offset); | |
472 | ||
473 | case offsetof(struct user_regs_struct, flags): | |
474 | return get_flags(task); | |
2047b08b RM |
475 | |
476 | #ifdef CONFIG_X86_64 | |
477 | case offsetof(struct user_regs_struct, fs_base): { | |
478 | /* | |
479 | * do_arch_prctl may have used a GDT slot instead of | |
480 | * the MSR. To userland, it appears the same either | |
481 | * way, except the %fs segment selector might not be 0. | |
482 | */ | |
483 | unsigned int seg = task->thread.fsindex; | |
484 | if (task->thread.fs != 0) | |
485 | return task->thread.fs; | |
486 | if (task == current) | |
487 | asm("movl %%fs,%0" : "=r" (seg)); | |
488 | if (seg != FS_TLS_SEL) | |
489 | return 0; | |
490 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
491 | } | |
492 | case offsetof(struct user_regs_struct, gs_base): { | |
493 | /* | |
494 | * Exactly the same here as the %fs handling above. | |
495 | */ | |
496 | unsigned int seg = task->thread.gsindex; | |
497 | if (task->thread.gs != 0) | |
498 | return task->thread.gs; | |
499 | if (task == current) | |
500 | asm("movl %%gs,%0" : "=r" (seg)); | |
501 | if (seg != GS_TLS_SEL) | |
502 | return 0; | |
503 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
504 | } | |
505 | #endif | |
06ee1b68 RM |
506 | } |
507 | ||
508 | return *pt_regs_access(task_pt_regs(task), offset); | |
509 | } | |
510 | ||
91e7b707 RM |
511 | static int genregs_get(struct task_struct *target, |
512 | const struct user_regset *regset, | |
513 | unsigned int pos, unsigned int count, | |
514 | void *kbuf, void __user *ubuf) | |
515 | { | |
516 | if (kbuf) { | |
517 | unsigned long *k = kbuf; | |
04a1e62c | 518 | while (count >= sizeof(*k)) { |
91e7b707 RM |
519 | *k++ = getreg(target, pos); |
520 | count -= sizeof(*k); | |
521 | pos += sizeof(*k); | |
522 | } | |
523 | } else { | |
524 | unsigned long __user *u = ubuf; | |
04a1e62c | 525 | while (count >= sizeof(*u)) { |
91e7b707 RM |
526 | if (__put_user(getreg(target, pos), u++)) |
527 | return -EFAULT; | |
528 | count -= sizeof(*u); | |
529 | pos += sizeof(*u); | |
530 | } | |
531 | } | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int genregs_set(struct task_struct *target, | |
537 | const struct user_regset *regset, | |
538 | unsigned int pos, unsigned int count, | |
539 | const void *kbuf, const void __user *ubuf) | |
540 | { | |
541 | int ret = 0; | |
542 | if (kbuf) { | |
543 | const unsigned long *k = kbuf; | |
04a1e62c | 544 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
545 | ret = putreg(target, pos, *k++); |
546 | count -= sizeof(*k); | |
547 | pos += sizeof(*k); | |
548 | } | |
549 | } else { | |
550 | const unsigned long __user *u = ubuf; | |
04a1e62c | 551 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
552 | unsigned long word; |
553 | ret = __get_user(word, u++); | |
554 | if (ret) | |
555 | break; | |
556 | ret = putreg(target, pos, word); | |
557 | count -= sizeof(*u); | |
558 | pos += sizeof(*u); | |
559 | } | |
560 | } | |
561 | return ret; | |
562 | } | |
563 | ||
a8b0ca17 | 564 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
565 | struct perf_sample_data *data, |
566 | struct pt_regs *regs) | |
d9771e8c | 567 | { |
0f534093 | 568 | int i; |
24f1e32c | 569 | struct thread_struct *thread = &(current->thread); |
0f534093 | 570 | |
72f674d2 P |
571 | /* |
572 | * Store in the virtual DR6 register the fact that the breakpoint | |
573 | * was hit so the thread's debugger will see it. | |
574 | */ | |
24f1e32c FW |
575 | for (i = 0; i < HBP_NUM; i++) { |
576 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 577 | break; |
24f1e32c | 578 | } |
d9771e8c | 579 | |
72f674d2 P |
580 | thread->debugreg6 |= (DR_TRAP0 << i); |
581 | } | |
d9771e8c | 582 | |
d9771e8c | 583 | /* |
24f1e32c FW |
584 | * Walk through every ptrace breakpoints for this thread and |
585 | * build the dr7 value on top of their attributes. | |
586 | * | |
d9771e8c | 587 | */ |
24f1e32c | 588 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 589 | { |
24f1e32c FW |
590 | int i; |
591 | int dr7 = 0; | |
592 | struct arch_hw_breakpoint *info; | |
593 | ||
594 | for (i = 0; i < HBP_NUM; i++) { | |
595 | if (bp[i] && !bp[i]->attr.disabled) { | |
596 | info = counter_arch_bp(bp[i]); | |
597 | dr7 |= encode_dr7(i, info->len, info->type); | |
598 | } | |
0f534093 | 599 | } |
24f1e32c FW |
600 | |
601 | return dr7; | |
d9771e8c RM |
602 | } |
603 | ||
9afe33ad ON |
604 | static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
605 | int len, int type, bool disabled) | |
606 | { | |
607 | int err, bp_len, bp_type; | |
608 | ||
609 | err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); | |
610 | if (!err) { | |
611 | attr->bp_len = bp_len; | |
612 | attr->bp_type = bp_type; | |
613 | attr->disabled = disabled; | |
614 | } | |
615 | ||
616 | return err; | |
617 | } | |
618 | ||
619 | static struct perf_event * | |
620 | ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, | |
621 | unsigned long addr, bool disabled) | |
5fa10b28 | 622 | { |
b326e956 | 623 | struct perf_event_attr attr; |
9afe33ad ON |
624 | int err; |
625 | ||
626 | ptrace_breakpoint_init(&attr); | |
627 | attr.bp_addr = addr; | |
5fa10b28 | 628 | |
9afe33ad | 629 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
5fa10b28 | 630 | if (err) |
9afe33ad ON |
631 | return ERR_PTR(err); |
632 | ||
633 | return register_user_hw_breakpoint(&attr, ptrace_triggered, | |
634 | NULL, tsk); | |
635 | } | |
636 | ||
637 | static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, | |
638 | int disabled) | |
639 | { | |
640 | struct perf_event_attr attr = bp->attr; | |
641 | int err; | |
5fa10b28 | 642 | |
9afe33ad ON |
643 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
644 | if (err) | |
645 | return err; | |
5fa10b28 | 646 | |
2f0993e0 | 647 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
648 | } |
649 | ||
72f674d2 P |
650 | /* |
651 | * Handle ptrace writes to debug register 7. | |
652 | */ | |
653 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 654 | { |
29a55513 | 655 | struct thread_struct *thread = &tsk->thread; |
24f1e32c | 656 | unsigned long old_dr7; |
29a55513 ON |
657 | bool second_pass = false; |
658 | int i, rc, ret = 0; | |
72f674d2 P |
659 | |
660 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 661 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
29a55513 | 662 | |
72f674d2 | 663 | restore: |
29a55513 | 664 | rc = 0; |
72f674d2 | 665 | for (i = 0; i < HBP_NUM; i++) { |
e6a7d607 ON |
666 | unsigned len, type; |
667 | bool disabled = !decode_dr7(data, i, &len, &type); | |
668 | struct perf_event *bp = thread->ptrace_bps[i]; | |
669 | ||
29a55513 ON |
670 | if (!bp) { |
671 | if (disabled) | |
672 | continue; | |
b87a95ad ON |
673 | |
674 | bp = ptrace_register_breakpoint(tsk, | |
675 | len, type, 0, disabled); | |
676 | if (IS_ERR(bp)) { | |
677 | rc = PTR_ERR(bp); | |
678 | break; | |
679 | } | |
680 | ||
681 | thread->ptrace_bps[i] = bp; | |
682 | continue; | |
72f674d2 | 683 | } |
0f534093 | 684 | |
9afe33ad | 685 | rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
44234adc | 686 | if (rc) |
24f1e32c | 687 | break; |
72f674d2 | 688 | } |
29a55513 ON |
689 | |
690 | /* Restore if the first pass failed, second_pass shouldn't fail. */ | |
691 | if (rc && !WARN_ON(second_pass)) { | |
692 | ret = rc; | |
693 | data = old_dr7; | |
694 | second_pass = true; | |
72f674d2 P |
695 | goto restore; |
696 | } | |
87dc669b | 697 | |
29a55513 | 698 | return ret; |
72f674d2 | 699 | } |
0f534093 | 700 | |
72f674d2 P |
701 | /* |
702 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
703 | */ | |
9d22b536 | 704 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 | 705 | { |
61e305c7 | 706 | struct thread_struct *thread = &tsk->thread; |
72f674d2 P |
707 | unsigned long val = 0; |
708 | ||
24f1e32c | 709 | if (n < HBP_NUM) { |
02be46fb | 710 | struct perf_event *bp = thread->ptrace_bps[n]; |
87dc669b | 711 | |
02be46fb | 712 | if (bp) |
87dc669b | 713 | val = bp->hw.info.address; |
24f1e32c | 714 | } else if (n == 6) { |
72f674d2 | 715 | val = thread->debugreg6; |
61e305c7 | 716 | } else if (n == 7) { |
326264a0 | 717 | val = thread->ptrace_dr7; |
24f1e32c | 718 | } |
72f674d2 P |
719 | return val; |
720 | } | |
0f534093 | 721 | |
24f1e32c FW |
722 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
723 | unsigned long addr) | |
724 | { | |
24f1e32c | 725 | struct thread_struct *t = &tsk->thread; |
9afe33ad | 726 | struct perf_event *bp = t->ptrace_bps[nr]; |
87dc669b FW |
727 | int err = 0; |
728 | ||
9afe33ad | 729 | if (!bp) { |
44234adc | 730 | /* |
9afe33ad ON |
731 | * Put stub len and type to create an inactive but correct bp. |
732 | * | |
44234adc FW |
733 | * CHECKME: the previous code returned -EIO if the addr wasn't |
734 | * a valid task virtual addr. The new one will return -EINVAL in | |
735 | * this case. | |
736 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
737 | * but -EIO looks better for ptrace, since we refuse a register | |
738 | * writing for the user. And anyway this is the previous | |
739 | * behaviour. | |
740 | */ | |
9afe33ad ON |
741 | bp = ptrace_register_breakpoint(tsk, |
742 | X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, | |
743 | addr, true); | |
744 | if (IS_ERR(bp)) | |
87dc669b | 745 | err = PTR_ERR(bp); |
9afe33ad ON |
746 | else |
747 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 748 | } else { |
9afe33ad | 749 | struct perf_event_attr attr = bp->attr; |
5fa10b28 | 750 | |
5fa10b28 | 751 | attr.bp_addr = addr; |
44234adc | 752 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 753 | } |
9afe33ad | 754 | |
87dc669b | 755 | return err; |
d9771e8c RM |
756 | } |
757 | ||
72f674d2 P |
758 | /* |
759 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
760 | */ | |
98b8b99a HS |
761 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
762 | unsigned long val) | |
72f674d2 | 763 | { |
61e305c7 | 764 | struct thread_struct *thread = &tsk->thread; |
72f674d2 | 765 | /* There are no DR4 or DR5 registers */ |
61e305c7 | 766 | int rc = -EIO; |
72f674d2 | 767 | |
72f674d2 | 768 | if (n < HBP_NUM) { |
24f1e32c | 769 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
61e305c7 ON |
770 | } else if (n == 6) { |
771 | thread->debugreg6 = val; | |
772 | rc = 0; | |
773 | } else if (n == 7) { | |
72f674d2 | 774 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
775 | if (!rc) |
776 | thread->ptrace_dr7 = val; | |
777 | } | |
72f674d2 | 778 | return rc; |
d9771e8c RM |
779 | } |
780 | ||
325af5fb RM |
781 | /* |
782 | * These access the current or another (stopped) task's io permission | |
783 | * bitmap for debugging or core dump. | |
784 | */ | |
785 | static int ioperm_active(struct task_struct *target, | |
786 | const struct user_regset *regset) | |
787 | { | |
788 | return target->thread.io_bitmap_max / regset->size; | |
789 | } | |
b4ef95de | 790 | |
325af5fb RM |
791 | static int ioperm_get(struct task_struct *target, |
792 | const struct user_regset *regset, | |
793 | unsigned int pos, unsigned int count, | |
794 | void *kbuf, void __user *ubuf) | |
eee3af4a | 795 | { |
325af5fb | 796 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
797 | return -ENXIO; |
798 | ||
325af5fb RM |
799 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
800 | target->thread.io_bitmap_ptr, | |
801 | 0, IO_BITMAP_BYTES); | |
802 | } | |
803 | ||
1da177e4 LT |
804 | /* |
805 | * Called by kernel/ptrace.c when detaching.. | |
806 | * | |
807 | * Make sure the single step bit is not set. | |
808 | */ | |
809 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 810 | { |
7f232343 | 811 | user_disable_single_step(child); |
e9c86c78 | 812 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 813 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 814 | #endif |
1da177e4 LT |
815 | } |
816 | ||
5a4646a4 RM |
817 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
818 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
819 | #endif | |
820 | ||
9b05a69e NK |
821 | long arch_ptrace(struct task_struct *child, long request, |
822 | unsigned long addr, unsigned long data) | |
1da177e4 | 823 | { |
5a4646a4 | 824 | int ret; |
1da177e4 LT |
825 | unsigned long __user *datap = (unsigned long __user *)data; |
826 | ||
1da177e4 | 827 | switch (request) { |
1da177e4 LT |
828 | /* read the word at location addr in the USER area. */ |
829 | case PTRACE_PEEKUSR: { | |
830 | unsigned long tmp; | |
831 | ||
832 | ret = -EIO; | |
eb5a3699 | 833 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
834 | break; |
835 | ||
836 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 837 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 838 | tmp = getreg(child, addr); |
e9c86c78 RM |
839 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
840 | addr <= offsetof(struct user, u_debugreg[7])) { | |
841 | addr -= offsetof(struct user, u_debugreg[0]); | |
842 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
843 | } |
844 | ret = put_user(tmp, datap); | |
845 | break; | |
846 | } | |
847 | ||
1da177e4 LT |
848 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
849 | ret = -EIO; | |
eb5a3699 | 850 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
851 | break; |
852 | ||
e9c86c78 | 853 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 854 | ret = putreg(child, addr, data); |
e9c86c78 RM |
855 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
856 | addr <= offsetof(struct user, u_debugreg[7])) { | |
857 | addr -= offsetof(struct user, u_debugreg[0]); | |
858 | ret = ptrace_set_debugreg(child, | |
859 | addr / sizeof(data), data); | |
1da177e4 | 860 | } |
e9c86c78 | 861 | break; |
1da177e4 | 862 | |
5a4646a4 RM |
863 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
864 | return copy_regset_to_user(child, | |
865 | task_user_regset_view(current), | |
866 | REGSET_GENERAL, | |
867 | 0, sizeof(struct user_regs_struct), | |
868 | datap); | |
869 | ||
870 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
871 | return copy_regset_from_user(child, | |
872 | task_user_regset_view(current), | |
873 | REGSET_GENERAL, | |
874 | 0, sizeof(struct user_regs_struct), | |
875 | datap); | |
876 | ||
877 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
878 | return copy_regset_to_user(child, | |
879 | task_user_regset_view(current), | |
880 | REGSET_FP, | |
881 | 0, sizeof(struct user_i387_struct), | |
882 | datap); | |
883 | ||
884 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
885 | return copy_regset_from_user(child, | |
886 | task_user_regset_view(current), | |
887 | REGSET_FP, | |
888 | 0, sizeof(struct user_i387_struct), | |
889 | datap); | |
1da177e4 | 890 | |
e9c86c78 | 891 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
892 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
893 | return copy_regset_to_user(child, &user_x86_32_view, | |
894 | REGSET_XFP, | |
895 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 896 | datap) ? -EIO : 0; |
5a4646a4 RM |
897 | |
898 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
899 | return copy_regset_from_user(child, &user_x86_32_view, | |
900 | REGSET_XFP, | |
901 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 902 | datap) ? -EIO : 0; |
e9c86c78 | 903 | #endif |
1da177e4 | 904 | |
e9c86c78 | 905 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 906 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 907 | if ((int) addr < 0) |
efd1ca52 RM |
908 | return -EIO; |
909 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 910 | (struct user_desc __user *)data); |
1da177e4 LT |
911 | break; |
912 | ||
913 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 914 | if ((int) addr < 0) |
efd1ca52 RM |
915 | return -EIO; |
916 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 917 | (struct user_desc __user *)data, 0); |
1da177e4 | 918 | break; |
e9c86c78 RM |
919 | #endif |
920 | ||
921 | #ifdef CONFIG_X86_64 | |
922 | /* normal 64bit interface to access TLS data. | |
923 | Works just like arch_prctl, except that the arguments | |
924 | are reversed. */ | |
925 | case PTRACE_ARCH_PRCTL: | |
926 | ret = do_arch_prctl(child, data, addr); | |
927 | break; | |
928 | #endif | |
1da177e4 LT |
929 | |
930 | default: | |
931 | ret = ptrace_request(child, request, addr, data); | |
932 | break; | |
933 | } | |
d9771e8c | 934 | |
1da177e4 LT |
935 | return ret; |
936 | } | |
937 | ||
cb757c41 RM |
938 | #ifdef CONFIG_IA32_EMULATION |
939 | ||
099cd6e9 RM |
940 | #include <linux/compat.h> |
941 | #include <linux/syscalls.h> | |
942 | #include <asm/ia32.h> | |
cb757c41 RM |
943 | #include <asm/user32.h> |
944 | ||
945 | #define R32(l,q) \ | |
946 | case offsetof(struct user32, regs.l): \ | |
947 | regs->q = value; break | |
948 | ||
949 | #define SEG32(rs) \ | |
950 | case offsetof(struct user32, regs.rs): \ | |
951 | return set_segment_reg(child, \ | |
952 | offsetof(struct user_regs_struct, rs), \ | |
953 | value); \ | |
954 | break | |
955 | ||
956 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
957 | { | |
958 | struct pt_regs *regs = task_pt_regs(child); | |
959 | ||
960 | switch (regno) { | |
961 | ||
962 | SEG32(cs); | |
963 | SEG32(ds); | |
964 | SEG32(es); | |
965 | SEG32(fs); | |
966 | SEG32(gs); | |
967 | SEG32(ss); | |
968 | ||
969 | R32(ebx, bx); | |
970 | R32(ecx, cx); | |
971 | R32(edx, dx); | |
972 | R32(edi, di); | |
973 | R32(esi, si); | |
974 | R32(ebp, bp); | |
975 | R32(eax, ax); | |
cb757c41 RM |
976 | R32(eip, ip); |
977 | R32(esp, sp); | |
978 | ||
40f0933d RM |
979 | case offsetof(struct user32, regs.orig_eax): |
980 | /* | |
8cb3ed13 RM |
981 | * A 32-bit debugger setting orig_eax means to restore |
982 | * the state of the task restarting a 32-bit syscall. | |
983 | * Make sure we interpret the -ERESTART* codes correctly | |
984 | * in case the task is not actually still sitting at the | |
985 | * exit from a 32-bit syscall with TS_COMPAT still set. | |
40f0933d | 986 | */ |
8cb3ed13 RM |
987 | regs->orig_ax = value; |
988 | if (syscall_get_nr(child, regs) >= 0) | |
989 | task_thread_info(child)->status |= TS_COMPAT; | |
40f0933d RM |
990 | break; |
991 | ||
cb757c41 RM |
992 | case offsetof(struct user32, regs.eflags): |
993 | return set_flags(child, value); | |
994 | ||
995 | case offsetof(struct user32, u_debugreg[0]) ... | |
996 | offsetof(struct user32, u_debugreg[7]): | |
997 | regno -= offsetof(struct user32, u_debugreg[0]); | |
998 | return ptrace_set_debugreg(child, regno / 4, value); | |
999 | ||
1000 | default: | |
1001 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1002 | return -EIO; | |
1003 | ||
1004 | /* | |
1005 | * Other dummy fields in the virtual user structure | |
1006 | * are ignored | |
1007 | */ | |
1008 | break; | |
1009 | } | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | #undef R32 | |
1014 | #undef SEG32 | |
1015 | ||
1016 | #define R32(l,q) \ | |
1017 | case offsetof(struct user32, regs.l): \ | |
1018 | *val = regs->q; break | |
1019 | ||
1020 | #define SEG32(rs) \ | |
1021 | case offsetof(struct user32, regs.rs): \ | |
1022 | *val = get_segment_reg(child, \ | |
1023 | offsetof(struct user_regs_struct, rs)); \ | |
1024 | break | |
1025 | ||
1026 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1027 | { | |
1028 | struct pt_regs *regs = task_pt_regs(child); | |
1029 | ||
1030 | switch (regno) { | |
1031 | ||
1032 | SEG32(ds); | |
1033 | SEG32(es); | |
1034 | SEG32(fs); | |
1035 | SEG32(gs); | |
1036 | ||
1037 | R32(cs, cs); | |
1038 | R32(ss, ss); | |
1039 | R32(ebx, bx); | |
1040 | R32(ecx, cx); | |
1041 | R32(edx, dx); | |
1042 | R32(edi, di); | |
1043 | R32(esi, si); | |
1044 | R32(ebp, bp); | |
1045 | R32(eax, ax); | |
1046 | R32(orig_eax, orig_ax); | |
1047 | R32(eip, ip); | |
1048 | R32(esp, sp); | |
1049 | ||
1050 | case offsetof(struct user32, regs.eflags): | |
1051 | *val = get_flags(child); | |
1052 | break; | |
1053 | ||
1054 | case offsetof(struct user32, u_debugreg[0]) ... | |
1055 | offsetof(struct user32, u_debugreg[7]): | |
1056 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1057 | *val = ptrace_get_debugreg(child, regno / 4); | |
1058 | break; | |
1059 | ||
1060 | default: | |
1061 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1062 | return -EIO; | |
1063 | ||
1064 | /* | |
1065 | * Other dummy fields in the virtual user structure | |
1066 | * are ignored | |
1067 | */ | |
1068 | *val = 0; | |
1069 | break; | |
1070 | } | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | #undef R32 | |
1075 | #undef SEG32 | |
1076 | ||
91e7b707 RM |
1077 | static int genregs32_get(struct task_struct *target, |
1078 | const struct user_regset *regset, | |
1079 | unsigned int pos, unsigned int count, | |
1080 | void *kbuf, void __user *ubuf) | |
1081 | { | |
1082 | if (kbuf) { | |
1083 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1084 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1085 | getreg32(target, pos, k++); |
1086 | count -= sizeof(*k); | |
1087 | pos += sizeof(*k); | |
1088 | } | |
1089 | } else { | |
1090 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1091 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1092 | compat_ulong_t word; |
1093 | getreg32(target, pos, &word); | |
1094 | if (__put_user(word, u++)) | |
1095 | return -EFAULT; | |
1096 | count -= sizeof(*u); | |
1097 | pos += sizeof(*u); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static int genregs32_set(struct task_struct *target, | |
1105 | const struct user_regset *regset, | |
1106 | unsigned int pos, unsigned int count, | |
1107 | const void *kbuf, const void __user *ubuf) | |
1108 | { | |
1109 | int ret = 0; | |
1110 | if (kbuf) { | |
1111 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1112 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1113 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1114 | count -= sizeof(*k); |
1115 | pos += sizeof(*k); | |
1116 | } | |
1117 | } else { | |
1118 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1119 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1120 | compat_ulong_t word; |
1121 | ret = __get_user(word, u++); | |
1122 | if (ret) | |
1123 | break; | |
f9cb02b0 | 1124 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1125 | count -= sizeof(*u); |
1126 | pos += sizeof(*u); | |
1127 | } | |
1128 | } | |
1129 | return ret; | |
1130 | } | |
1131 | ||
55283e25 L |
1132 | #ifdef CONFIG_X86_X32_ABI |
1133 | static long x32_arch_ptrace(struct task_struct *child, | |
1134 | compat_long_t request, compat_ulong_t caddr, | |
1135 | compat_ulong_t cdata) | |
1136 | { | |
1137 | unsigned long addr = caddr; | |
1138 | unsigned long data = cdata; | |
1139 | void __user *datap = compat_ptr(data); | |
1140 | int ret; | |
1141 | ||
1142 | switch (request) { | |
1143 | /* Read 32bits at location addr in the USER area. Only allow | |
1144 | to return the lower 32bits of segment and debug registers. */ | |
1145 | case PTRACE_PEEKUSR: { | |
1146 | u32 tmp; | |
1147 | ||
1148 | ret = -EIO; | |
1149 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1150 | addr < offsetof(struct user_regs_struct, cs)) | |
1151 | break; | |
1152 | ||
1153 | tmp = 0; /* Default return condition */ | |
1154 | if (addr < sizeof(struct user_regs_struct)) | |
1155 | tmp = getreg(child, addr); | |
1156 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1157 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1158 | addr -= offsetof(struct user, u_debugreg[0]); | |
1159 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1160 | } | |
1161 | ret = put_user(tmp, (__u32 __user *)datap); | |
1162 | break; | |
1163 | } | |
1164 | ||
1165 | /* Write the word at location addr in the USER area. Only allow | |
1166 | to update segment and debug registers with the upper 32bits | |
1167 | zero-extended. */ | |
1168 | case PTRACE_POKEUSR: | |
1169 | ret = -EIO; | |
1170 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1171 | addr < offsetof(struct user_regs_struct, cs)) | |
1172 | break; | |
1173 | ||
1174 | if (addr < sizeof(struct user_regs_struct)) | |
1175 | ret = putreg(child, addr, data); | |
1176 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1177 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1178 | addr -= offsetof(struct user, u_debugreg[0]); | |
1179 | ret = ptrace_set_debugreg(child, | |
1180 | addr / sizeof(data), data); | |
1181 | } | |
1182 | break; | |
1183 | ||
1184 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1185 | return copy_regset_to_user(child, | |
1186 | task_user_regset_view(current), | |
1187 | REGSET_GENERAL, | |
1188 | 0, sizeof(struct user_regs_struct), | |
1189 | datap); | |
1190 | ||
1191 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1192 | return copy_regset_from_user(child, | |
1193 | task_user_regset_view(current), | |
1194 | REGSET_GENERAL, | |
1195 | 0, sizeof(struct user_regs_struct), | |
1196 | datap); | |
1197 | ||
1198 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1199 | return copy_regset_to_user(child, | |
1200 | task_user_regset_view(current), | |
1201 | REGSET_FP, | |
1202 | 0, sizeof(struct user_i387_struct), | |
1203 | datap); | |
1204 | ||
1205 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1206 | return copy_regset_from_user(child, | |
1207 | task_user_regset_view(current), | |
1208 | REGSET_FP, | |
1209 | 0, sizeof(struct user_i387_struct), | |
1210 | datap); | |
1211 | ||
55283e25 L |
1212 | default: |
1213 | return compat_ptrace_request(child, request, addr, data); | |
1214 | } | |
1215 | ||
1216 | return ret; | |
1217 | } | |
1218 | #endif | |
1219 | ||
562b80ba RM |
1220 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1221 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1222 | { |
562b80ba RM |
1223 | unsigned long addr = caddr; |
1224 | unsigned long data = cdata; | |
099cd6e9 RM |
1225 | void __user *datap = compat_ptr(data); |
1226 | int ret; | |
1227 | __u32 val; | |
1228 | ||
55283e25 L |
1229 | #ifdef CONFIG_X86_X32_ABI |
1230 | if (!is_ia32_task()) | |
1231 | return x32_arch_ptrace(child, request, caddr, cdata); | |
1232 | #endif | |
1233 | ||
099cd6e9 | 1234 | switch (request) { |
099cd6e9 RM |
1235 | case PTRACE_PEEKUSR: |
1236 | ret = getreg32(child, addr, &val); | |
1237 | if (ret == 0) | |
1238 | ret = put_user(val, (__u32 __user *)datap); | |
1239 | break; | |
1240 | ||
1241 | case PTRACE_POKEUSR: | |
1242 | ret = putreg32(child, addr, data); | |
1243 | break; | |
1244 | ||
5a4646a4 RM |
1245 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1246 | return copy_regset_to_user(child, &user_x86_32_view, | |
1247 | REGSET_GENERAL, | |
1248 | 0, sizeof(struct user_regs_struct32), | |
1249 | datap); | |
1250 | ||
1251 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1252 | return copy_regset_from_user(child, &user_x86_32_view, | |
1253 | REGSET_GENERAL, 0, | |
1254 | sizeof(struct user_regs_struct32), | |
1255 | datap); | |
1256 | ||
1257 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1258 | return copy_regset_to_user(child, &user_x86_32_view, | |
1259 | REGSET_FP, 0, | |
1260 | sizeof(struct user_i387_ia32_struct), | |
1261 | datap); | |
1262 | ||
1263 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1264 | return copy_regset_from_user( | |
1265 | child, &user_x86_32_view, REGSET_FP, | |
1266 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1267 | ||
1268 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1269 | return copy_regset_to_user(child, &user_x86_32_view, | |
1270 | REGSET_XFP, 0, | |
1271 | sizeof(struct user32_fxsr_struct), | |
1272 | datap); | |
1273 | ||
1274 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1275 | return copy_regset_from_user(child, &user_x86_32_view, | |
1276 | REGSET_XFP, 0, | |
1277 | sizeof(struct user32_fxsr_struct), | |
1278 | datap); | |
099cd6e9 | 1279 | |
562b80ba RM |
1280 | case PTRACE_GET_THREAD_AREA: |
1281 | case PTRACE_SET_THREAD_AREA: | |
1282 | return arch_ptrace(child, request, addr, data); | |
1283 | ||
099cd6e9 | 1284 | default: |
fdadd54d | 1285 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1286 | } |
1287 | ||
099cd6e9 RM |
1288 | return ret; |
1289 | } | |
1290 | ||
cb757c41 RM |
1291 | #endif /* CONFIG_IA32_EMULATION */ |
1292 | ||
070459d9 RM |
1293 | #ifdef CONFIG_X86_64 |
1294 | ||
5b3efd50 | 1295 | static struct user_regset x86_64_regsets[] __read_mostly = { |
070459d9 RM |
1296 | [REGSET_GENERAL] = { |
1297 | .core_note_type = NT_PRSTATUS, | |
1298 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1299 | .size = sizeof(long), .align = sizeof(long), | |
1300 | .get = genregs_get, .set = genregs_set | |
1301 | }, | |
1302 | [REGSET_FP] = { | |
1303 | .core_note_type = NT_PRFPREG, | |
1304 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1305 | .size = sizeof(long), .align = sizeof(long), | |
1306 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1307 | }, | |
5b3efd50 SS |
1308 | [REGSET_XSTATE] = { |
1309 | .core_note_type = NT_X86_XSTATE, | |
1310 | .size = sizeof(u64), .align = sizeof(u64), | |
1311 | .active = xstateregs_active, .get = xstateregs_get, | |
1312 | .set = xstateregs_set | |
1313 | }, | |
325af5fb RM |
1314 | [REGSET_IOPERM64] = { |
1315 | .core_note_type = NT_386_IOPERM, | |
1316 | .n = IO_BITMAP_LONGS, | |
1317 | .size = sizeof(long), .align = sizeof(long), | |
1318 | .active = ioperm_active, .get = ioperm_get | |
1319 | }, | |
070459d9 RM |
1320 | }; |
1321 | ||
1322 | static const struct user_regset_view user_x86_64_view = { | |
1323 | .name = "x86_64", .e_machine = EM_X86_64, | |
1324 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1325 | }; | |
1326 | ||
1327 | #else /* CONFIG_X86_32 */ | |
1328 | ||
1329 | #define user_regs_struct32 user_regs_struct | |
1330 | #define genregs32_get genregs_get | |
1331 | #define genregs32_set genregs_set | |
1332 | ||
1333 | #endif /* CONFIG_X86_64 */ | |
1334 | ||
1335 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
5b3efd50 | 1336 | static struct user_regset x86_32_regsets[] __read_mostly = { |
070459d9 RM |
1337 | [REGSET_GENERAL] = { |
1338 | .core_note_type = NT_PRSTATUS, | |
1339 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1340 | .size = sizeof(u32), .align = sizeof(u32), | |
1341 | .get = genregs32_get, .set = genregs32_set | |
1342 | }, | |
1343 | [REGSET_FP] = { | |
1344 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1345 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1346 | .size = sizeof(u32), .align = sizeof(u32), |
1347 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1348 | }, | |
1349 | [REGSET_XFP] = { | |
1350 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1351 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1352 | .size = sizeof(u32), .align = sizeof(u32), |
1353 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1354 | }, | |
5b3efd50 SS |
1355 | [REGSET_XSTATE] = { |
1356 | .core_note_type = NT_X86_XSTATE, | |
1357 | .size = sizeof(u64), .align = sizeof(u64), | |
1358 | .active = xstateregs_active, .get = xstateregs_get, | |
1359 | .set = xstateregs_set | |
1360 | }, | |
070459d9 | 1361 | [REGSET_TLS] = { |
bb61682b | 1362 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1363 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1364 | .size = sizeof(struct user_desc), | |
1365 | .align = sizeof(struct user_desc), | |
1366 | .active = regset_tls_active, | |
1367 | .get = regset_tls_get, .set = regset_tls_set | |
1368 | }, | |
325af5fb RM |
1369 | [REGSET_IOPERM32] = { |
1370 | .core_note_type = NT_386_IOPERM, | |
1371 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1372 | .size = sizeof(u32), .align = sizeof(u32), | |
1373 | .active = ioperm_active, .get = ioperm_get | |
1374 | }, | |
070459d9 RM |
1375 | }; |
1376 | ||
1377 | static const struct user_regset_view user_x86_32_view = { | |
1378 | .name = "i386", .e_machine = EM_386, | |
1379 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1380 | }; | |
1381 | #endif | |
1382 | ||
5b3efd50 SS |
1383 | /* |
1384 | * This represents bytes 464..511 in the memory layout exported through | |
1385 | * the REGSET_XSTATE interface. | |
1386 | */ | |
1387 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1388 | ||
1389 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) | |
1390 | { | |
1391 | #ifdef CONFIG_X86_64 | |
1392 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1393 | #endif | |
1394 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1395 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1396 | #endif | |
1397 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1398 | } | |
1399 | ||
070459d9 RM |
1400 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1401 | { | |
1402 | #ifdef CONFIG_IA32_EMULATION | |
1403 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1404 | #endif | |
1405 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1406 | return &user_x86_32_view; | |
1407 | #endif | |
1408 | #ifdef CONFIG_X86_64 | |
1409 | return &user_x86_64_view; | |
1410 | #endif | |
1411 | } | |
1412 | ||
7f38551f ON |
1413 | static void fill_sigtrap_info(struct task_struct *tsk, |
1414 | struct pt_regs *regs, | |
1415 | int error_code, int si_code, | |
1416 | struct siginfo *info) | |
1da177e4 | 1417 | { |
51e7dc70 | 1418 | tsk->thread.trap_nr = X86_TRAP_DB; |
1da177e4 LT |
1419 | tsk->thread.error_code = error_code; |
1420 | ||
7f38551f ON |
1421 | memset(info, 0, sizeof(*info)); |
1422 | info->si_signo = SIGTRAP; | |
1423 | info->si_code = si_code; | |
1424 | info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL; | |
1425 | } | |
1426 | ||
1427 | void user_single_step_siginfo(struct task_struct *tsk, | |
1428 | struct pt_regs *regs, | |
1429 | struct siginfo *info) | |
1430 | { | |
1431 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); | |
1432 | } | |
1da177e4 | 1433 | |
7f38551f ON |
1434 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1435 | int error_code, int si_code) | |
1436 | { | |
1437 | struct siginfo info; | |
1da177e4 | 1438 | |
7f38551f | 1439 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
27b46d76 | 1440 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1441 | force_sig_info(SIGTRAP, &info, tsk); |
1442 | } | |
1443 | ||
86976cd8 | 1444 | |
d4d67150 RM |
1445 | #ifdef CONFIG_X86_32 |
1446 | # define IS_IA32 1 | |
1447 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1448 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1449 | #else |
1450 | # define IS_IA32 0 | |
1451 | #endif | |
1452 | ||
1453 | /* | |
1454 | * We must return the syscall number to actually look up in the table. | |
1455 | * This can be -1L to skip running any syscall at all. | |
1456 | */ | |
1b4ac2a9 | 1457 | long syscall_trace_enter(struct pt_regs *regs) |
86976cd8 | 1458 | { |
d4d67150 RM |
1459 | long ret = 0; |
1460 | ||
91d1aa43 | 1461 | user_exit(); |
bf5a3c13 | 1462 | |
380fdd75 RM |
1463 | /* |
1464 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1465 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1466 | * If user-mode had set TF itself, then it's still clear from | |
1467 | * do_debug() and we need to set it again to restore the user | |
1468 | * state. If we entered on the slow path, TF was already set. | |
1469 | */ | |
1470 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1471 | regs->flags |= X86_EFLAGS_TF; | |
1472 | ||
86976cd8 | 1473 | /* do the secure computing check first */ |
c6cfbeb4 WD |
1474 | if (secure_computing(regs->orig_ax)) { |
1475 | /* seccomp failures shouldn't expose any additional code. */ | |
1476 | ret = -1L; | |
1477 | goto out; | |
1478 | } | |
86976cd8 | 1479 | |
d4d67150 RM |
1480 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1481 | ret = -1L; | |
1482 | ||
eeea3c3f RM |
1483 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1484 | tracehook_report_syscall_entry(regs)) | |
1485 | ret = -1L; | |
86976cd8 | 1486 | |
66700001 | 1487 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1488 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1489 | |
b05d8447 EP |
1490 | if (IS_IA32) |
1491 | audit_syscall_entry(AUDIT_ARCH_I386, | |
1492 | regs->orig_ax, | |
1493 | regs->bx, regs->cx, | |
1494 | regs->dx, regs->si); | |
d4d67150 | 1495 | #ifdef CONFIG_X86_64 |
b05d8447 EP |
1496 | else |
1497 | audit_syscall_entry(AUDIT_ARCH_X86_64, | |
1498 | regs->orig_ax, | |
1499 | regs->di, regs->si, | |
1500 | regs->dx, regs->r10); | |
d4d67150 | 1501 | #endif |
d4d67150 | 1502 | |
c6cfbeb4 | 1503 | out: |
d4d67150 | 1504 | return ret ?: regs->orig_ax; |
86976cd8 RM |
1505 | } |
1506 | ||
1b4ac2a9 | 1507 | void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 | 1508 | { |
d5196503 ON |
1509 | bool step; |
1510 | ||
2c5594df FW |
1511 | /* |
1512 | * We may come here right after calling schedule_user() | |
1513 | * or do_notify_resume(), in which case we can be in RCU | |
1514 | * user mode. | |
1515 | */ | |
91d1aa43 | 1516 | user_exit(); |
2c5594df | 1517 | |
d7e7528b | 1518 | audit_syscall_exit(regs); |
86976cd8 | 1519 | |
66700001 | 1520 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1521 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1522 | |
d4d67150 RM |
1523 | /* |
1524 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1525 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1526 | * We already reported this syscall instruction in | |
d5196503 | 1527 | * syscall_trace_enter(). |
d4d67150 | 1528 | */ |
d5196503 ON |
1529 | step = unlikely(test_thread_flag(TIF_SINGLESTEP)) && |
1530 | !test_thread_flag(TIF_SYSCALL_EMU); | |
1531 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
1532 | tracehook_report_syscall_exit(regs, step); | |
bf5a3c13 | 1533 | |
91d1aa43 | 1534 | user_enter(); |
d4d67150 | 1535 | } |