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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* By Ross Biro 1/23/92 */ |
3 | /* | |
4 | * Pentium III FXSR, SSE support | |
5 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/sched.h> | |
68db0cf1 | 10 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
11 | #include <linux/mm.h> |
12 | #include <linux/smp.h> | |
1da177e4 | 13 | #include <linux/errno.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 | 15 | #include <linux/ptrace.h> |
eeea3c3f | 16 | #include <linux/tracehook.h> |
1da177e4 | 17 | #include <linux/user.h> |
070459d9 | 18 | #include <linux/elf.h> |
1da177e4 LT |
19 | #include <linux/security.h> |
20 | #include <linux/audit.h> | |
21 | #include <linux/seccomp.h> | |
7ed20e1a | 22 | #include <linux/signal.h> |
24f1e32c FW |
23 | #include <linux/perf_event.h> |
24 | #include <linux/hw_breakpoint.h> | |
bf5a3c13 | 25 | #include <linux/rcupdate.h> |
19348e74 | 26 | #include <linux/export.h> |
91d1aa43 | 27 | #include <linux/context_tracking.h> |
1da177e4 | 28 | |
7c0f6ba6 | 29 | #include <linux/uaccess.h> |
1da177e4 | 30 | #include <asm/pgtable.h> |
1da177e4 | 31 | #include <asm/processor.h> |
78f7f1e5 | 32 | #include <asm/fpu/internal.h> |
fcbc99c4 | 33 | #include <asm/fpu/signal.h> |
59a36d16 | 34 | #include <asm/fpu/regset.h> |
1da177e4 LT |
35 | #include <asm/debugreg.h> |
36 | #include <asm/ldt.h> | |
37 | #include <asm/desc.h> | |
2047b08b RM |
38 | #include <asm/prctl.h> |
39 | #include <asm/proto.h> | |
72f674d2 | 40 | #include <asm/hw_breakpoint.h> |
51e7dc70 | 41 | #include <asm/traps.h> |
1f484aa6 | 42 | #include <asm/syscall.h> |
b1378a56 | 43 | #include <asm/fsgsbase.h> |
eee3af4a | 44 | |
070459d9 RM |
45 | #include "tls.h" |
46 | ||
47 | enum x86_regset { | |
48 | REGSET_GENERAL, | |
49 | REGSET_FP, | |
50 | REGSET_XFP, | |
325af5fb | 51 | REGSET_IOPERM64 = REGSET_XFP, |
5b3efd50 | 52 | REGSET_XSTATE, |
070459d9 | 53 | REGSET_TLS, |
325af5fb | 54 | REGSET_IOPERM32, |
070459d9 | 55 | }; |
eee3af4a | 56 | |
b1cf540f MH |
57 | struct pt_regs_offset { |
58 | const char *name; | |
59 | int offset; | |
60 | }; | |
61 | ||
62 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} | |
63 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
64 | ||
65 | static const struct pt_regs_offset regoffset_table[] = { | |
66 | #ifdef CONFIG_X86_64 | |
67 | REG_OFFSET_NAME(r15), | |
68 | REG_OFFSET_NAME(r14), | |
69 | REG_OFFSET_NAME(r13), | |
70 | REG_OFFSET_NAME(r12), | |
71 | REG_OFFSET_NAME(r11), | |
72 | REG_OFFSET_NAME(r10), | |
73 | REG_OFFSET_NAME(r9), | |
74 | REG_OFFSET_NAME(r8), | |
75 | #endif | |
76 | REG_OFFSET_NAME(bx), | |
77 | REG_OFFSET_NAME(cx), | |
78 | REG_OFFSET_NAME(dx), | |
79 | REG_OFFSET_NAME(si), | |
80 | REG_OFFSET_NAME(di), | |
81 | REG_OFFSET_NAME(bp), | |
82 | REG_OFFSET_NAME(ax), | |
83 | #ifdef CONFIG_X86_32 | |
84 | REG_OFFSET_NAME(ds), | |
85 | REG_OFFSET_NAME(es), | |
86 | REG_OFFSET_NAME(fs), | |
87 | REG_OFFSET_NAME(gs), | |
88 | #endif | |
89 | REG_OFFSET_NAME(orig_ax), | |
90 | REG_OFFSET_NAME(ip), | |
91 | REG_OFFSET_NAME(cs), | |
92 | REG_OFFSET_NAME(flags), | |
93 | REG_OFFSET_NAME(sp), | |
94 | REG_OFFSET_NAME(ss), | |
95 | REG_OFFSET_END, | |
96 | }; | |
97 | ||
98 | /** | |
99 | * regs_query_register_offset() - query register offset from its name | |
100 | * @name: the name of a register | |
101 | * | |
102 | * regs_query_register_offset() returns the offset of a register in struct | |
103 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
104 | */ | |
105 | int regs_query_register_offset(const char *name) | |
106 | { | |
107 | const struct pt_regs_offset *roff; | |
108 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
109 | if (!strcmp(roff->name, name)) | |
110 | return roff->offset; | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | /** | |
115 | * regs_query_register_name() - query register name from its offset | |
116 | * @offset: the offset of a register in struct pt_regs. | |
117 | * | |
118 | * regs_query_register_name() returns the name of a register from its | |
119 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
120 | */ | |
121 | const char *regs_query_register_name(unsigned int offset) | |
122 | { | |
123 | const struct pt_regs_offset *roff; | |
124 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
125 | if (roff->offset == offset) | |
126 | return roff->name; | |
127 | return NULL; | |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * does not yet catch signals sent when the child dies. | |
132 | * in exit.c or in signal.c. | |
133 | */ | |
134 | ||
9f155b98 CE |
135 | /* |
136 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 137 | */ |
e39c2891 RM |
138 | #define FLAG_MASK_32 ((unsigned long) \ |
139 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
140 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
141 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
142 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
143 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
144 | ||
2047b08b RM |
145 | /* |
146 | * Determines whether a value may be installed in a segment register. | |
147 | */ | |
148 | static inline bool invalid_selector(u16 value) | |
149 | { | |
150 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
151 | } | |
152 | ||
153 | #ifdef CONFIG_X86_32 | |
154 | ||
e39c2891 | 155 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 156 | |
10226238 RR |
157 | /* |
158 | * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode | |
159 | * when it traps. The previous stack will be directly underneath the saved | |
160 | * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. | |
161 | * | |
162 | * Now, if the stack is empty, '®s->sp' is out of range. In this | |
163 | * case we try to take the previous stack. To always return a non-null | |
164 | * stack pointer we fall back to regs as stack if no previous stack | |
165 | * exists. | |
166 | * | |
167 | * This is valid only for kernel mode traps. | |
168 | */ | |
169 | unsigned long kernel_stack_pointer(struct pt_regs *regs) | |
170 | { | |
171 | unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1); | |
172 | unsigned long sp = (unsigned long)®s->sp; | |
0788aa6a | 173 | u32 *prev_esp; |
10226238 RR |
174 | |
175 | if (context == (sp & ~(THREAD_SIZE - 1))) | |
176 | return sp; | |
177 | ||
198d208d | 178 | prev_esp = (u32 *)(context); |
72b4f6a5 JP |
179 | if (*prev_esp) |
180 | return (unsigned long)*prev_esp; | |
10226238 RR |
181 | |
182 | return (unsigned long)regs; | |
183 | } | |
cb57a2b4 | 184 | EXPORT_SYMBOL_GPL(kernel_stack_pointer); |
10226238 | 185 | |
4fe702c7 | 186 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 187 | { |
65ea5b03 | 188 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 189 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
190 | } |
191 | ||
06ee1b68 | 192 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 193 | { |
06ee1b68 RM |
194 | /* |
195 | * Returning the value truncates it to 16 bits. | |
196 | */ | |
197 | unsigned int retval; | |
198 | if (offset != offsetof(struct user_regs_struct, gs)) | |
199 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
200 | else { | |
06ee1b68 | 201 | if (task == current) |
d9a89a26 TH |
202 | retval = get_user_gs(task_pt_regs(task)); |
203 | else | |
204 | retval = task_user_gs(task); | |
06ee1b68 RM |
205 | } |
206 | return retval; | |
207 | } | |
208 | ||
209 | static int set_segment_reg(struct task_struct *task, | |
210 | unsigned long offset, u16 value) | |
211 | { | |
212 | /* | |
213 | * The value argument was already truncated to 16 bits. | |
214 | */ | |
2047b08b | 215 | if (invalid_selector(value)) |
06ee1b68 RM |
216 | return -EIO; |
217 | ||
c63855d0 RM |
218 | /* |
219 | * For %cs and %ss we cannot permit a null selector. | |
220 | * We can permit a bogus selector as long as it has USER_RPL. | |
221 | * Null selectors are fine for other segment registers, but | |
222 | * we will never get back to user mode with invalid %cs or %ss | |
223 | * and will take the trap in iret instead. Much code relies | |
224 | * on user_mode() to distinguish a user trap frame (which can | |
225 | * safely use invalid selectors) from a kernel trap frame. | |
226 | */ | |
227 | switch (offset) { | |
228 | case offsetof(struct user_regs_struct, cs): | |
229 | case offsetof(struct user_regs_struct, ss): | |
230 | if (unlikely(value == 0)) | |
231 | return -EIO; | |
232 | ||
233 | default: | |
06ee1b68 | 234 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
235 | break; |
236 | ||
237 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 238 | if (task == current) |
d9a89a26 TH |
239 | set_user_gs(task_pt_regs(task), value); |
240 | else | |
241 | task_user_gs(task) = value; | |
1da177e4 | 242 | } |
06ee1b68 | 243 | |
1da177e4 LT |
244 | return 0; |
245 | } | |
246 | ||
2047b08b RM |
247 | #else /* CONFIG_X86_64 */ |
248 | ||
249 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
250 | ||
251 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
252 | { | |
253 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
254 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
255 | } | |
256 | ||
257 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
258 | { | |
259 | /* | |
260 | * Returning the value truncates it to 16 bits. | |
261 | */ | |
262 | unsigned int seg; | |
263 | ||
264 | switch (offset) { | |
265 | case offsetof(struct user_regs_struct, fs): | |
266 | if (task == current) { | |
267 | /* Older gas can't assemble movq %?s,%r?? */ | |
268 | asm("movl %%fs,%0" : "=r" (seg)); | |
269 | return seg; | |
270 | } | |
271 | return task->thread.fsindex; | |
272 | case offsetof(struct user_regs_struct, gs): | |
273 | if (task == current) { | |
274 | asm("movl %%gs,%0" : "=r" (seg)); | |
275 | return seg; | |
276 | } | |
277 | return task->thread.gsindex; | |
278 | case offsetof(struct user_regs_struct, ds): | |
279 | if (task == current) { | |
280 | asm("movl %%ds,%0" : "=r" (seg)); | |
281 | return seg; | |
282 | } | |
283 | return task->thread.ds; | |
284 | case offsetof(struct user_regs_struct, es): | |
285 | if (task == current) { | |
286 | asm("movl %%es,%0" : "=r" (seg)); | |
287 | return seg; | |
288 | } | |
289 | return task->thread.es; | |
290 | ||
291 | case offsetof(struct user_regs_struct, cs): | |
292 | case offsetof(struct user_regs_struct, ss): | |
293 | break; | |
294 | } | |
295 | return *pt_regs_access(task_pt_regs(task), offset); | |
296 | } | |
297 | ||
298 | static int set_segment_reg(struct task_struct *task, | |
299 | unsigned long offset, u16 value) | |
300 | { | |
301 | /* | |
302 | * The value argument was already truncated to 16 bits. | |
303 | */ | |
304 | if (invalid_selector(value)) | |
305 | return -EIO; | |
306 | ||
307 | switch (offset) { | |
308 | case offsetof(struct user_regs_struct,fs): | |
2047b08b RM |
309 | task->thread.fsindex = value; |
310 | if (task == current) | |
311 | loadsegment(fs, task->thread.fsindex); | |
312 | break; | |
313 | case offsetof(struct user_regs_struct,gs): | |
2047b08b RM |
314 | task->thread.gsindex = value; |
315 | if (task == current) | |
316 | load_gs_index(task->thread.gsindex); | |
317 | break; | |
318 | case offsetof(struct user_regs_struct,ds): | |
319 | task->thread.ds = value; | |
320 | if (task == current) | |
321 | loadsegment(ds, task->thread.ds); | |
322 | break; | |
323 | case offsetof(struct user_regs_struct,es): | |
324 | task->thread.es = value; | |
325 | if (task == current) | |
326 | loadsegment(es, task->thread.es); | |
327 | break; | |
328 | ||
329 | /* | |
330 | * Can't actually change these in 64-bit mode. | |
331 | */ | |
332 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
333 | if (unlikely(value == 0)) |
334 | return -EIO; | |
08571f1a | 335 | task_pt_regs(task)->cs = value; |
cb757c41 | 336 | break; |
2047b08b | 337 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
338 | if (unlikely(value == 0)) |
339 | return -EIO; | |
08571f1a | 340 | task_pt_regs(task)->ss = value; |
cb757c41 | 341 | break; |
2047b08b RM |
342 | } |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
2047b08b RM |
347 | #endif /* CONFIG_X86_32 */ |
348 | ||
06ee1b68 | 349 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 350 | { |
06ee1b68 RM |
351 | unsigned long retval = task_pt_regs(task)->flags; |
352 | ||
353 | /* | |
354 | * If the debugger set TF, hide it from the readout. | |
355 | */ | |
356 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
357 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 358 | |
1da177e4 LT |
359 | return retval; |
360 | } | |
361 | ||
06ee1b68 RM |
362 | static int set_flags(struct task_struct *task, unsigned long value) |
363 | { | |
364 | struct pt_regs *regs = task_pt_regs(task); | |
365 | ||
366 | /* | |
367 | * If the user value contains TF, mark that | |
368 | * it was not "us" (the debugger) that set it. | |
369 | * If not, make sure it stays set if we had. | |
370 | */ | |
371 | if (value & X86_EFLAGS_TF) | |
372 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
373 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
374 | value |= X86_EFLAGS_TF; | |
375 | ||
376 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int putreg(struct task_struct *child, | |
382 | unsigned long offset, unsigned long value) | |
383 | { | |
384 | switch (offset) { | |
385 | case offsetof(struct user_regs_struct, cs): | |
386 | case offsetof(struct user_regs_struct, ds): | |
387 | case offsetof(struct user_regs_struct, es): | |
388 | case offsetof(struct user_regs_struct, fs): | |
389 | case offsetof(struct user_regs_struct, gs): | |
390 | case offsetof(struct user_regs_struct, ss): | |
391 | return set_segment_reg(child, offset, value); | |
392 | ||
393 | case offsetof(struct user_regs_struct, flags): | |
394 | return set_flags(child, value); | |
2047b08b RM |
395 | |
396 | #ifdef CONFIG_X86_64 | |
397 | case offsetof(struct user_regs_struct,fs_base): | |
d696ca01 | 398 | if (value >= TASK_SIZE_MAX) |
2047b08b RM |
399 | return -EIO; |
400 | /* | |
87ab4689 CB |
401 | * When changing the FS base, use do_arch_prctl_64() |
402 | * to set the index to zero and to set the base | |
403 | * as requested. | |
2047b08b | 404 | */ |
296f781a | 405 | if (child->thread.fsbase != value) |
87ab4689 | 406 | return do_arch_prctl_64(child, ARCH_SET_FS, value); |
2047b08b RM |
407 | return 0; |
408 | case offsetof(struct user_regs_struct,gs_base): | |
409 | /* | |
410 | * Exactly the same here as the %fs handling above. | |
411 | */ | |
d696ca01 | 412 | if (value >= TASK_SIZE_MAX) |
2047b08b | 413 | return -EIO; |
296f781a | 414 | if (child->thread.gsbase != value) |
87ab4689 | 415 | return do_arch_prctl_64(child, ARCH_SET_GS, value); |
2047b08b RM |
416 | return 0; |
417 | #endif | |
06ee1b68 RM |
418 | } |
419 | ||
420 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
421 | return 0; | |
422 | } | |
423 | ||
424 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
425 | { | |
426 | switch (offset) { | |
427 | case offsetof(struct user_regs_struct, cs): | |
428 | case offsetof(struct user_regs_struct, ds): | |
429 | case offsetof(struct user_regs_struct, es): | |
430 | case offsetof(struct user_regs_struct, fs): | |
431 | case offsetof(struct user_regs_struct, gs): | |
432 | case offsetof(struct user_regs_struct, ss): | |
433 | return get_segment_reg(task, offset); | |
434 | ||
435 | case offsetof(struct user_regs_struct, flags): | |
436 | return get_flags(task); | |
2047b08b RM |
437 | |
438 | #ifdef CONFIG_X86_64 | |
e696c231 CB |
439 | case offsetof(struct user_regs_struct, fs_base): |
440 | return x86_fsbase_read_task(task); | |
441 | case offsetof(struct user_regs_struct, gs_base): | |
442 | return x86_gsbase_read_task(task); | |
2047b08b | 443 | #endif |
06ee1b68 RM |
444 | } |
445 | ||
446 | return *pt_regs_access(task_pt_regs(task), offset); | |
447 | } | |
448 | ||
91e7b707 RM |
449 | static int genregs_get(struct task_struct *target, |
450 | const struct user_regset *regset, | |
451 | unsigned int pos, unsigned int count, | |
452 | void *kbuf, void __user *ubuf) | |
453 | { | |
454 | if (kbuf) { | |
455 | unsigned long *k = kbuf; | |
04a1e62c | 456 | while (count >= sizeof(*k)) { |
91e7b707 RM |
457 | *k++ = getreg(target, pos); |
458 | count -= sizeof(*k); | |
459 | pos += sizeof(*k); | |
460 | } | |
461 | } else { | |
462 | unsigned long __user *u = ubuf; | |
04a1e62c | 463 | while (count >= sizeof(*u)) { |
91e7b707 RM |
464 | if (__put_user(getreg(target, pos), u++)) |
465 | return -EFAULT; | |
466 | count -= sizeof(*u); | |
467 | pos += sizeof(*u); | |
468 | } | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static int genregs_set(struct task_struct *target, | |
475 | const struct user_regset *regset, | |
476 | unsigned int pos, unsigned int count, | |
477 | const void *kbuf, const void __user *ubuf) | |
478 | { | |
479 | int ret = 0; | |
480 | if (kbuf) { | |
481 | const unsigned long *k = kbuf; | |
04a1e62c | 482 | while (count >= sizeof(*k) && !ret) { |
91e7b707 RM |
483 | ret = putreg(target, pos, *k++); |
484 | count -= sizeof(*k); | |
485 | pos += sizeof(*k); | |
486 | } | |
487 | } else { | |
488 | const unsigned long __user *u = ubuf; | |
04a1e62c | 489 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
490 | unsigned long word; |
491 | ret = __get_user(word, u++); | |
492 | if (ret) | |
493 | break; | |
494 | ret = putreg(target, pos, word); | |
495 | count -= sizeof(*u); | |
496 | pos += sizeof(*u); | |
497 | } | |
498 | } | |
499 | return ret; | |
500 | } | |
501 | ||
a8b0ca17 | 502 | static void ptrace_triggered(struct perf_event *bp, |
b326e956 FW |
503 | struct perf_sample_data *data, |
504 | struct pt_regs *regs) | |
d9771e8c | 505 | { |
0f534093 | 506 | int i; |
24f1e32c | 507 | struct thread_struct *thread = &(current->thread); |
0f534093 | 508 | |
72f674d2 P |
509 | /* |
510 | * Store in the virtual DR6 register the fact that the breakpoint | |
511 | * was hit so the thread's debugger will see it. | |
512 | */ | |
24f1e32c FW |
513 | for (i = 0; i < HBP_NUM; i++) { |
514 | if (thread->ptrace_bps[i] == bp) | |
72f674d2 | 515 | break; |
24f1e32c | 516 | } |
d9771e8c | 517 | |
72f674d2 P |
518 | thread->debugreg6 |= (DR_TRAP0 << i); |
519 | } | |
d9771e8c | 520 | |
d9771e8c | 521 | /* |
24f1e32c FW |
522 | * Walk through every ptrace breakpoints for this thread and |
523 | * build the dr7 value on top of their attributes. | |
524 | * | |
d9771e8c | 525 | */ |
24f1e32c | 526 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
d9771e8c | 527 | { |
24f1e32c FW |
528 | int i; |
529 | int dr7 = 0; | |
530 | struct arch_hw_breakpoint *info; | |
531 | ||
532 | for (i = 0; i < HBP_NUM; i++) { | |
533 | if (bp[i] && !bp[i]->attr.disabled) { | |
534 | info = counter_arch_bp(bp[i]); | |
535 | dr7 |= encode_dr7(i, info->len, info->type); | |
536 | } | |
0f534093 | 537 | } |
24f1e32c FW |
538 | |
539 | return dr7; | |
d9771e8c RM |
540 | } |
541 | ||
9afe33ad ON |
542 | static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
543 | int len, int type, bool disabled) | |
544 | { | |
545 | int err, bp_len, bp_type; | |
546 | ||
547 | err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); | |
548 | if (!err) { | |
549 | attr->bp_len = bp_len; | |
550 | attr->bp_type = bp_type; | |
551 | attr->disabled = disabled; | |
552 | } | |
553 | ||
554 | return err; | |
555 | } | |
556 | ||
557 | static struct perf_event * | |
558 | ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, | |
559 | unsigned long addr, bool disabled) | |
5fa10b28 | 560 | { |
b326e956 | 561 | struct perf_event_attr attr; |
9afe33ad ON |
562 | int err; |
563 | ||
564 | ptrace_breakpoint_init(&attr); | |
565 | attr.bp_addr = addr; | |
5fa10b28 | 566 | |
9afe33ad | 567 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
5fa10b28 | 568 | if (err) |
9afe33ad ON |
569 | return ERR_PTR(err); |
570 | ||
571 | return register_user_hw_breakpoint(&attr, ptrace_triggered, | |
572 | NULL, tsk); | |
573 | } | |
574 | ||
575 | static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, | |
576 | int disabled) | |
577 | { | |
578 | struct perf_event_attr attr = bp->attr; | |
579 | int err; | |
5fa10b28 | 580 | |
9afe33ad ON |
581 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
582 | if (err) | |
583 | return err; | |
5fa10b28 | 584 | |
2f0993e0 | 585 | return modify_user_hw_breakpoint(bp, &attr); |
5fa10b28 FW |
586 | } |
587 | ||
72f674d2 P |
588 | /* |
589 | * Handle ptrace writes to debug register 7. | |
590 | */ | |
591 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) | |
d9771e8c | 592 | { |
29a55513 | 593 | struct thread_struct *thread = &tsk->thread; |
24f1e32c | 594 | unsigned long old_dr7; |
29a55513 ON |
595 | bool second_pass = false; |
596 | int i, rc, ret = 0; | |
72f674d2 P |
597 | |
598 | data &= ~DR_CONTROL_RESERVED; | |
24f1e32c | 599 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
29a55513 | 600 | |
72f674d2 | 601 | restore: |
29a55513 | 602 | rc = 0; |
72f674d2 | 603 | for (i = 0; i < HBP_NUM; i++) { |
e6a7d607 ON |
604 | unsigned len, type; |
605 | bool disabled = !decode_dr7(data, i, &len, &type); | |
606 | struct perf_event *bp = thread->ptrace_bps[i]; | |
607 | ||
29a55513 ON |
608 | if (!bp) { |
609 | if (disabled) | |
610 | continue; | |
b87a95ad ON |
611 | |
612 | bp = ptrace_register_breakpoint(tsk, | |
613 | len, type, 0, disabled); | |
614 | if (IS_ERR(bp)) { | |
615 | rc = PTR_ERR(bp); | |
616 | break; | |
617 | } | |
618 | ||
619 | thread->ptrace_bps[i] = bp; | |
620 | continue; | |
72f674d2 | 621 | } |
0f534093 | 622 | |
9afe33ad | 623 | rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
44234adc | 624 | if (rc) |
24f1e32c | 625 | break; |
72f674d2 | 626 | } |
29a55513 ON |
627 | |
628 | /* Restore if the first pass failed, second_pass shouldn't fail. */ | |
629 | if (rc && !WARN_ON(second_pass)) { | |
630 | ret = rc; | |
631 | data = old_dr7; | |
632 | second_pass = true; | |
72f674d2 P |
633 | goto restore; |
634 | } | |
87dc669b | 635 | |
29a55513 | 636 | return ret; |
72f674d2 | 637 | } |
0f534093 | 638 | |
72f674d2 P |
639 | /* |
640 | * Handle PTRACE_PEEKUSR calls for the debug register area. | |
641 | */ | |
9d22b536 | 642 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
72f674d2 | 643 | { |
61e305c7 | 644 | struct thread_struct *thread = &tsk->thread; |
72f674d2 P |
645 | unsigned long val = 0; |
646 | ||
24f1e32c | 647 | if (n < HBP_NUM) { |
02be46fb | 648 | struct perf_event *bp = thread->ptrace_bps[n]; |
87dc669b | 649 | |
02be46fb | 650 | if (bp) |
87dc669b | 651 | val = bp->hw.info.address; |
24f1e32c | 652 | } else if (n == 6) { |
72f674d2 | 653 | val = thread->debugreg6; |
61e305c7 | 654 | } else if (n == 7) { |
326264a0 | 655 | val = thread->ptrace_dr7; |
24f1e32c | 656 | } |
72f674d2 P |
657 | return val; |
658 | } | |
0f534093 | 659 | |
24f1e32c FW |
660 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
661 | unsigned long addr) | |
662 | { | |
24f1e32c | 663 | struct thread_struct *t = &tsk->thread; |
9afe33ad | 664 | struct perf_event *bp = t->ptrace_bps[nr]; |
87dc669b FW |
665 | int err = 0; |
666 | ||
9afe33ad | 667 | if (!bp) { |
44234adc | 668 | /* |
9afe33ad ON |
669 | * Put stub len and type to create an inactive but correct bp. |
670 | * | |
44234adc FW |
671 | * CHECKME: the previous code returned -EIO if the addr wasn't |
672 | * a valid task virtual addr. The new one will return -EINVAL in | |
673 | * this case. | |
674 | * -EINVAL may be what we want for in-kernel breakpoints users, | |
675 | * but -EIO looks better for ptrace, since we refuse a register | |
676 | * writing for the user. And anyway this is the previous | |
677 | * behaviour. | |
678 | */ | |
9afe33ad ON |
679 | bp = ptrace_register_breakpoint(tsk, |
680 | X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, | |
681 | addr, true); | |
682 | if (IS_ERR(bp)) | |
87dc669b | 683 | err = PTR_ERR(bp); |
9afe33ad ON |
684 | else |
685 | t->ptrace_bps[nr] = bp; | |
24f1e32c | 686 | } else { |
9afe33ad | 687 | struct perf_event_attr attr = bp->attr; |
5fa10b28 | 688 | |
5fa10b28 | 689 | attr.bp_addr = addr; |
44234adc | 690 | err = modify_user_hw_breakpoint(bp, &attr); |
d9771e8c | 691 | } |
9afe33ad | 692 | |
87dc669b | 693 | return err; |
d9771e8c RM |
694 | } |
695 | ||
72f674d2 P |
696 | /* |
697 | * Handle PTRACE_POKEUSR calls for the debug register area. | |
698 | */ | |
98b8b99a HS |
699 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
700 | unsigned long val) | |
72f674d2 | 701 | { |
61e305c7 | 702 | struct thread_struct *thread = &tsk->thread; |
72f674d2 | 703 | /* There are no DR4 or DR5 registers */ |
61e305c7 | 704 | int rc = -EIO; |
72f674d2 | 705 | |
72f674d2 | 706 | if (n < HBP_NUM) { |
24f1e32c | 707 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
61e305c7 ON |
708 | } else if (n == 6) { |
709 | thread->debugreg6 = val; | |
710 | rc = 0; | |
711 | } else if (n == 7) { | |
72f674d2 | 712 | rc = ptrace_write_dr7(tsk, val); |
326264a0 FW |
713 | if (!rc) |
714 | thread->ptrace_dr7 = val; | |
715 | } | |
72f674d2 | 716 | return rc; |
d9771e8c RM |
717 | } |
718 | ||
325af5fb RM |
719 | /* |
720 | * These access the current or another (stopped) task's io permission | |
721 | * bitmap for debugging or core dump. | |
722 | */ | |
723 | static int ioperm_active(struct task_struct *target, | |
724 | const struct user_regset *regset) | |
725 | { | |
726 | return target->thread.io_bitmap_max / regset->size; | |
727 | } | |
b4ef95de | 728 | |
325af5fb RM |
729 | static int ioperm_get(struct task_struct *target, |
730 | const struct user_regset *regset, | |
731 | unsigned int pos, unsigned int count, | |
732 | void *kbuf, void __user *ubuf) | |
eee3af4a | 733 | { |
325af5fb | 734 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
735 | return -ENXIO; |
736 | ||
325af5fb RM |
737 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
738 | target->thread.io_bitmap_ptr, | |
739 | 0, IO_BITMAP_BYTES); | |
740 | } | |
741 | ||
1da177e4 LT |
742 | /* |
743 | * Called by kernel/ptrace.c when detaching.. | |
744 | * | |
745 | * Make sure the single step bit is not set. | |
746 | */ | |
747 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 748 | { |
7f232343 | 749 | user_disable_single_step(child); |
e9c86c78 | 750 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 751 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 752 | #endif |
1da177e4 LT |
753 | } |
754 | ||
5a4646a4 RM |
755 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
756 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
757 | #endif | |
758 | ||
9b05a69e NK |
759 | long arch_ptrace(struct task_struct *child, long request, |
760 | unsigned long addr, unsigned long data) | |
1da177e4 | 761 | { |
5a4646a4 | 762 | int ret; |
1da177e4 LT |
763 | unsigned long __user *datap = (unsigned long __user *)data; |
764 | ||
1da177e4 | 765 | switch (request) { |
1da177e4 LT |
766 | /* read the word at location addr in the USER area. */ |
767 | case PTRACE_PEEKUSR: { | |
768 | unsigned long tmp; | |
769 | ||
770 | ret = -EIO; | |
eb5a3699 | 771 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
772 | break; |
773 | ||
774 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 775 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 776 | tmp = getreg(child, addr); |
e9c86c78 RM |
777 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
778 | addr <= offsetof(struct user, u_debugreg[7])) { | |
779 | addr -= offsetof(struct user, u_debugreg[0]); | |
780 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
781 | } |
782 | ret = put_user(tmp, datap); | |
783 | break; | |
784 | } | |
785 | ||
1da177e4 LT |
786 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
787 | ret = -EIO; | |
eb5a3699 | 788 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
1da177e4 LT |
789 | break; |
790 | ||
e9c86c78 | 791 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 792 | ret = putreg(child, addr, data); |
e9c86c78 RM |
793 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
794 | addr <= offsetof(struct user, u_debugreg[7])) { | |
795 | addr -= offsetof(struct user, u_debugreg[0]); | |
796 | ret = ptrace_set_debugreg(child, | |
797 | addr / sizeof(data), data); | |
1da177e4 | 798 | } |
e9c86c78 | 799 | break; |
1da177e4 | 800 | |
5a4646a4 RM |
801 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
802 | return copy_regset_to_user(child, | |
803 | task_user_regset_view(current), | |
804 | REGSET_GENERAL, | |
805 | 0, sizeof(struct user_regs_struct), | |
806 | datap); | |
807 | ||
808 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
809 | return copy_regset_from_user(child, | |
810 | task_user_regset_view(current), | |
811 | REGSET_GENERAL, | |
812 | 0, sizeof(struct user_regs_struct), | |
813 | datap); | |
814 | ||
815 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
816 | return copy_regset_to_user(child, | |
817 | task_user_regset_view(current), | |
818 | REGSET_FP, | |
819 | 0, sizeof(struct user_i387_struct), | |
820 | datap); | |
821 | ||
822 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
823 | return copy_regset_from_user(child, | |
824 | task_user_regset_view(current), | |
825 | REGSET_FP, | |
826 | 0, sizeof(struct user_i387_struct), | |
827 | datap); | |
1da177e4 | 828 | |
e9c86c78 | 829 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
830 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
831 | return copy_regset_to_user(child, &user_x86_32_view, | |
832 | REGSET_XFP, | |
833 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 834 | datap) ? -EIO : 0; |
5a4646a4 RM |
835 | |
836 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
837 | return copy_regset_from_user(child, &user_x86_32_view, | |
838 | REGSET_XFP, | |
839 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 840 | datap) ? -EIO : 0; |
e9c86c78 | 841 | #endif |
1da177e4 | 842 | |
e9c86c78 | 843 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 844 | case PTRACE_GET_THREAD_AREA: |
9b05a69e | 845 | if ((int) addr < 0) |
efd1ca52 RM |
846 | return -EIO; |
847 | ret = do_get_thread_area(child, addr, | |
eb5a3699 | 848 | (struct user_desc __user *)data); |
1da177e4 LT |
849 | break; |
850 | ||
851 | case PTRACE_SET_THREAD_AREA: | |
9b05a69e | 852 | if ((int) addr < 0) |
efd1ca52 RM |
853 | return -EIO; |
854 | ret = do_set_thread_area(child, addr, | |
eb5a3699 | 855 | (struct user_desc __user *)data, 0); |
1da177e4 | 856 | break; |
e9c86c78 RM |
857 | #endif |
858 | ||
859 | #ifdef CONFIG_X86_64 | |
860 | /* normal 64bit interface to access TLS data. | |
861 | Works just like arch_prctl, except that the arguments | |
862 | are reversed. */ | |
863 | case PTRACE_ARCH_PRCTL: | |
17a6e1b8 | 864 | ret = do_arch_prctl_64(child, data, addr); |
e9c86c78 RM |
865 | break; |
866 | #endif | |
1da177e4 LT |
867 | |
868 | default: | |
869 | ret = ptrace_request(child, request, addr, data); | |
870 | break; | |
871 | } | |
d9771e8c | 872 | |
1da177e4 LT |
873 | return ret; |
874 | } | |
875 | ||
cb757c41 RM |
876 | #ifdef CONFIG_IA32_EMULATION |
877 | ||
099cd6e9 RM |
878 | #include <linux/compat.h> |
879 | #include <linux/syscalls.h> | |
880 | #include <asm/ia32.h> | |
cb757c41 RM |
881 | #include <asm/user32.h> |
882 | ||
883 | #define R32(l,q) \ | |
884 | case offsetof(struct user32, regs.l): \ | |
885 | regs->q = value; break | |
886 | ||
887 | #define SEG32(rs) \ | |
888 | case offsetof(struct user32, regs.rs): \ | |
889 | return set_segment_reg(child, \ | |
890 | offsetof(struct user_regs_struct, rs), \ | |
891 | value); \ | |
892 | break | |
893 | ||
894 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
895 | { | |
896 | struct pt_regs *regs = task_pt_regs(child); | |
897 | ||
898 | switch (regno) { | |
899 | ||
900 | SEG32(cs); | |
901 | SEG32(ds); | |
902 | SEG32(es); | |
903 | SEG32(fs); | |
904 | SEG32(gs); | |
905 | SEG32(ss); | |
906 | ||
907 | R32(ebx, bx); | |
908 | R32(ecx, cx); | |
909 | R32(edx, dx); | |
910 | R32(edi, di); | |
911 | R32(esi, si); | |
912 | R32(ebp, bp); | |
913 | R32(eax, ax); | |
cb757c41 RM |
914 | R32(eip, ip); |
915 | R32(esp, sp); | |
916 | ||
40f0933d RM |
917 | case offsetof(struct user32, regs.orig_eax): |
918 | /* | |
609c19a3 AL |
919 | * Warning: bizarre corner case fixup here. A 32-bit |
920 | * debugger setting orig_eax to -1 wants to disable | |
921 | * syscall restart. Make sure that the syscall | |
922 | * restart code sign-extends orig_ax. Also make sure | |
923 | * we interpret the -ERESTART* codes correctly if | |
924 | * loaded into regs->ax in case the task is not | |
925 | * actually still sitting at the exit from a 32-bit | |
926 | * syscall with TS_COMPAT still set. | |
40f0933d | 927 | */ |
8cb3ed13 RM |
928 | regs->orig_ax = value; |
929 | if (syscall_get_nr(child, regs) >= 0) | |
37a8f7c3 | 930 | child->thread_info.status |= TS_I386_REGS_POKED; |
40f0933d RM |
931 | break; |
932 | ||
cb757c41 RM |
933 | case offsetof(struct user32, regs.eflags): |
934 | return set_flags(child, value); | |
935 | ||
936 | case offsetof(struct user32, u_debugreg[0]) ... | |
937 | offsetof(struct user32, u_debugreg[7]): | |
938 | regno -= offsetof(struct user32, u_debugreg[0]); | |
939 | return ptrace_set_debugreg(child, regno / 4, value); | |
940 | ||
941 | default: | |
942 | if (regno > sizeof(struct user32) || (regno & 3)) | |
943 | return -EIO; | |
944 | ||
945 | /* | |
946 | * Other dummy fields in the virtual user structure | |
947 | * are ignored | |
948 | */ | |
949 | break; | |
950 | } | |
951 | return 0; | |
952 | } | |
953 | ||
954 | #undef R32 | |
955 | #undef SEG32 | |
956 | ||
957 | #define R32(l,q) \ | |
958 | case offsetof(struct user32, regs.l): \ | |
959 | *val = regs->q; break | |
960 | ||
961 | #define SEG32(rs) \ | |
962 | case offsetof(struct user32, regs.rs): \ | |
963 | *val = get_segment_reg(child, \ | |
964 | offsetof(struct user_regs_struct, rs)); \ | |
965 | break | |
966 | ||
967 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
968 | { | |
969 | struct pt_regs *regs = task_pt_regs(child); | |
970 | ||
971 | switch (regno) { | |
972 | ||
973 | SEG32(ds); | |
974 | SEG32(es); | |
975 | SEG32(fs); | |
976 | SEG32(gs); | |
977 | ||
978 | R32(cs, cs); | |
979 | R32(ss, ss); | |
980 | R32(ebx, bx); | |
981 | R32(ecx, cx); | |
982 | R32(edx, dx); | |
983 | R32(edi, di); | |
984 | R32(esi, si); | |
985 | R32(ebp, bp); | |
986 | R32(eax, ax); | |
987 | R32(orig_eax, orig_ax); | |
988 | R32(eip, ip); | |
989 | R32(esp, sp); | |
990 | ||
991 | case offsetof(struct user32, regs.eflags): | |
992 | *val = get_flags(child); | |
993 | break; | |
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 | *val = ptrace_get_debugreg(child, regno / 4); | |
999 | break; | |
1000 | ||
1001 | default: | |
1002 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1003 | return -EIO; | |
1004 | ||
1005 | /* | |
1006 | * Other dummy fields in the virtual user structure | |
1007 | * are ignored | |
1008 | */ | |
1009 | *val = 0; | |
1010 | break; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | #undef R32 | |
1016 | #undef SEG32 | |
1017 | ||
91e7b707 RM |
1018 | static int genregs32_get(struct task_struct *target, |
1019 | const struct user_regset *regset, | |
1020 | unsigned int pos, unsigned int count, | |
1021 | void *kbuf, void __user *ubuf) | |
1022 | { | |
1023 | if (kbuf) { | |
1024 | compat_ulong_t *k = kbuf; | |
04a1e62c | 1025 | while (count >= sizeof(*k)) { |
91e7b707 RM |
1026 | getreg32(target, pos, k++); |
1027 | count -= sizeof(*k); | |
1028 | pos += sizeof(*k); | |
1029 | } | |
1030 | } else { | |
1031 | compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1032 | while (count >= sizeof(*u)) { |
91e7b707 RM |
1033 | compat_ulong_t word; |
1034 | getreg32(target, pos, &word); | |
1035 | if (__put_user(word, u++)) | |
1036 | return -EFAULT; | |
1037 | count -= sizeof(*u); | |
1038 | pos += sizeof(*u); | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | static int genregs32_set(struct task_struct *target, | |
1046 | const struct user_regset *regset, | |
1047 | unsigned int pos, unsigned int count, | |
1048 | const void *kbuf, const void __user *ubuf) | |
1049 | { | |
1050 | int ret = 0; | |
1051 | if (kbuf) { | |
1052 | const compat_ulong_t *k = kbuf; | |
04a1e62c | 1053 | while (count >= sizeof(*k) && !ret) { |
f9cb02b0 | 1054 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1055 | count -= sizeof(*k); |
1056 | pos += sizeof(*k); | |
1057 | } | |
1058 | } else { | |
1059 | const compat_ulong_t __user *u = ubuf; | |
04a1e62c | 1060 | while (count >= sizeof(*u) && !ret) { |
91e7b707 RM |
1061 | compat_ulong_t word; |
1062 | ret = __get_user(word, u++); | |
1063 | if (ret) | |
1064 | break; | |
f9cb02b0 | 1065 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1066 | count -= sizeof(*u); |
1067 | pos += sizeof(*u); | |
1068 | } | |
1069 | } | |
1070 | return ret; | |
1071 | } | |
1072 | ||
601275c3 BG |
1073 | static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request, |
1074 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1075 | { | |
1076 | unsigned long addr = caddr; | |
1077 | unsigned long data = cdata; | |
1078 | void __user *datap = compat_ptr(data); | |
1079 | int ret; | |
1080 | __u32 val; | |
1081 | ||
1082 | switch (request) { | |
1083 | case PTRACE_PEEKUSR: | |
1084 | ret = getreg32(child, addr, &val); | |
1085 | if (ret == 0) | |
1086 | ret = put_user(val, (__u32 __user *)datap); | |
1087 | break; | |
1088 | ||
1089 | case PTRACE_POKEUSR: | |
1090 | ret = putreg32(child, addr, data); | |
1091 | break; | |
1092 | ||
1093 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1094 | return copy_regset_to_user(child, &user_x86_32_view, | |
1095 | REGSET_GENERAL, | |
1096 | 0, sizeof(struct user_regs_struct32), | |
1097 | datap); | |
1098 | ||
1099 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1100 | return copy_regset_from_user(child, &user_x86_32_view, | |
1101 | REGSET_GENERAL, 0, | |
1102 | sizeof(struct user_regs_struct32), | |
1103 | datap); | |
1104 | ||
1105 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1106 | return copy_regset_to_user(child, &user_x86_32_view, | |
1107 | REGSET_FP, 0, | |
1108 | sizeof(struct user_i387_ia32_struct), | |
1109 | datap); | |
1110 | ||
1111 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1112 | return copy_regset_from_user( | |
1113 | child, &user_x86_32_view, REGSET_FP, | |
1114 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1115 | ||
1116 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1117 | return copy_regset_to_user(child, &user_x86_32_view, | |
1118 | REGSET_XFP, 0, | |
1119 | sizeof(struct user32_fxsr_struct), | |
1120 | datap); | |
1121 | ||
1122 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1123 | return copy_regset_from_user(child, &user_x86_32_view, | |
1124 | REGSET_XFP, 0, | |
1125 | sizeof(struct user32_fxsr_struct), | |
1126 | datap); | |
1127 | ||
1128 | case PTRACE_GET_THREAD_AREA: | |
1129 | case PTRACE_SET_THREAD_AREA: | |
1130 | return arch_ptrace(child, request, addr, data); | |
1131 | ||
1132 | default: | |
1133 | return compat_ptrace_request(child, request, addr, data); | |
1134 | } | |
1135 | ||
1136 | return ret; | |
1137 | } | |
1138 | #endif /* CONFIG_IA32_EMULATION */ | |
1139 | ||
55283e25 L |
1140 | #ifdef CONFIG_X86_X32_ABI |
1141 | static long x32_arch_ptrace(struct task_struct *child, | |
1142 | compat_long_t request, compat_ulong_t caddr, | |
1143 | compat_ulong_t cdata) | |
1144 | { | |
1145 | unsigned long addr = caddr; | |
1146 | unsigned long data = cdata; | |
1147 | void __user *datap = compat_ptr(data); | |
1148 | int ret; | |
1149 | ||
1150 | switch (request) { | |
1151 | /* Read 32bits at location addr in the USER area. Only allow | |
1152 | to return the lower 32bits of segment and debug registers. */ | |
1153 | case PTRACE_PEEKUSR: { | |
1154 | u32 tmp; | |
1155 | ||
1156 | ret = -EIO; | |
1157 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1158 | addr < offsetof(struct user_regs_struct, cs)) | |
1159 | break; | |
1160 | ||
1161 | tmp = 0; /* Default return condition */ | |
1162 | if (addr < sizeof(struct user_regs_struct)) | |
1163 | tmp = getreg(child, addr); | |
1164 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1165 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1166 | addr -= offsetof(struct user, u_debugreg[0]); | |
1167 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1168 | } | |
1169 | ret = put_user(tmp, (__u32 __user *)datap); | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | /* Write the word at location addr in the USER area. Only allow | |
1174 | to update segment and debug registers with the upper 32bits | |
1175 | zero-extended. */ | |
1176 | case PTRACE_POKEUSR: | |
1177 | ret = -EIO; | |
1178 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || | |
1179 | addr < offsetof(struct user_regs_struct, cs)) | |
1180 | break; | |
1181 | ||
1182 | if (addr < sizeof(struct user_regs_struct)) | |
1183 | ret = putreg(child, addr, data); | |
1184 | else if (addr >= offsetof(struct user, u_debugreg[0]) && | |
1185 | addr <= offsetof(struct user, u_debugreg[7])) { | |
1186 | addr -= offsetof(struct user, u_debugreg[0]); | |
1187 | ret = ptrace_set_debugreg(child, | |
1188 | addr / sizeof(data), data); | |
1189 | } | |
1190 | break; | |
1191 | ||
1192 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ | |
1193 | return copy_regset_to_user(child, | |
1194 | task_user_regset_view(current), | |
1195 | REGSET_GENERAL, | |
1196 | 0, sizeof(struct user_regs_struct), | |
1197 | datap); | |
1198 | ||
1199 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1200 | return copy_regset_from_user(child, | |
1201 | task_user_regset_view(current), | |
1202 | REGSET_GENERAL, | |
1203 | 0, sizeof(struct user_regs_struct), | |
1204 | datap); | |
1205 | ||
1206 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1207 | return copy_regset_to_user(child, | |
1208 | task_user_regset_view(current), | |
1209 | REGSET_FP, | |
1210 | 0, sizeof(struct user_i387_struct), | |
1211 | datap); | |
1212 | ||
1213 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1214 | return copy_regset_from_user(child, | |
1215 | task_user_regset_view(current), | |
1216 | REGSET_FP, | |
1217 | 0, sizeof(struct user_i387_struct), | |
1218 | datap); | |
1219 | ||
55283e25 L |
1220 | default: |
1221 | return compat_ptrace_request(child, request, addr, data); | |
1222 | } | |
1223 | ||
1224 | return ret; | |
1225 | } | |
1226 | #endif | |
1227 | ||
601275c3 | 1228 | #ifdef CONFIG_COMPAT |
562b80ba RM |
1229 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1230 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1231 | { |
55283e25 | 1232 | #ifdef CONFIG_X86_X32_ABI |
abfb9498 | 1233 | if (!in_ia32_syscall()) |
55283e25 L |
1234 | return x32_arch_ptrace(child, request, caddr, cdata); |
1235 | #endif | |
601275c3 BG |
1236 | #ifdef CONFIG_IA32_EMULATION |
1237 | return ia32_arch_ptrace(child, request, caddr, cdata); | |
1238 | #else | |
1239 | return 0; | |
1240 | #endif | |
099cd6e9 | 1241 | } |
601275c3 | 1242 | #endif /* CONFIG_COMPAT */ |
cb757c41 | 1243 | |
070459d9 RM |
1244 | #ifdef CONFIG_X86_64 |
1245 | ||
404f6aac | 1246 | static struct user_regset x86_64_regsets[] __ro_after_init = { |
070459d9 RM |
1247 | [REGSET_GENERAL] = { |
1248 | .core_note_type = NT_PRSTATUS, | |
1249 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1250 | .size = sizeof(long), .align = sizeof(long), | |
1251 | .get = genregs_get, .set = genregs_set | |
1252 | }, | |
1253 | [REGSET_FP] = { | |
1254 | .core_note_type = NT_PRFPREG, | |
1255 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1256 | .size = sizeof(long), .align = sizeof(long), | |
678eaf60 | 1257 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1258 | }, |
5b3efd50 SS |
1259 | [REGSET_XSTATE] = { |
1260 | .core_note_type = NT_X86_XSTATE, | |
1261 | .size = sizeof(u64), .align = sizeof(u64), | |
1262 | .active = xstateregs_active, .get = xstateregs_get, | |
1263 | .set = xstateregs_set | |
1264 | }, | |
325af5fb RM |
1265 | [REGSET_IOPERM64] = { |
1266 | .core_note_type = NT_386_IOPERM, | |
1267 | .n = IO_BITMAP_LONGS, | |
1268 | .size = sizeof(long), .align = sizeof(long), | |
1269 | .active = ioperm_active, .get = ioperm_get | |
1270 | }, | |
070459d9 RM |
1271 | }; |
1272 | ||
1273 | static const struct user_regset_view user_x86_64_view = { | |
1274 | .name = "x86_64", .e_machine = EM_X86_64, | |
1275 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1276 | }; | |
1277 | ||
1278 | #else /* CONFIG_X86_32 */ | |
1279 | ||
1280 | #define user_regs_struct32 user_regs_struct | |
1281 | #define genregs32_get genregs_get | |
1282 | #define genregs32_set genregs_set | |
1283 | ||
1284 | #endif /* CONFIG_X86_64 */ | |
1285 | ||
1286 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
404f6aac | 1287 | static struct user_regset x86_32_regsets[] __ro_after_init = { |
070459d9 RM |
1288 | [REGSET_GENERAL] = { |
1289 | .core_note_type = NT_PRSTATUS, | |
1290 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1291 | .size = sizeof(u32), .align = sizeof(u32), | |
1292 | .get = genregs32_get, .set = genregs32_set | |
1293 | }, | |
1294 | [REGSET_FP] = { | |
1295 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1296 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 | 1297 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1298 | .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set |
070459d9 RM |
1299 | }, |
1300 | [REGSET_XFP] = { | |
1301 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1302 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 | 1303 | .size = sizeof(u32), .align = sizeof(u32), |
678eaf60 | 1304 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
070459d9 | 1305 | }, |
5b3efd50 SS |
1306 | [REGSET_XSTATE] = { |
1307 | .core_note_type = NT_X86_XSTATE, | |
1308 | .size = sizeof(u64), .align = sizeof(u64), | |
1309 | .active = xstateregs_active, .get = xstateregs_get, | |
1310 | .set = xstateregs_set | |
1311 | }, | |
070459d9 | 1312 | [REGSET_TLS] = { |
bb61682b | 1313 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1314 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1315 | .size = sizeof(struct user_desc), | |
1316 | .align = sizeof(struct user_desc), | |
1317 | .active = regset_tls_active, | |
1318 | .get = regset_tls_get, .set = regset_tls_set | |
1319 | }, | |
325af5fb RM |
1320 | [REGSET_IOPERM32] = { |
1321 | .core_note_type = NT_386_IOPERM, | |
1322 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1323 | .size = sizeof(u32), .align = sizeof(u32), | |
1324 | .active = ioperm_active, .get = ioperm_get | |
1325 | }, | |
070459d9 RM |
1326 | }; |
1327 | ||
1328 | static const struct user_regset_view user_x86_32_view = { | |
1329 | .name = "i386", .e_machine = EM_386, | |
1330 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1331 | }; | |
1332 | #endif | |
1333 | ||
5b3efd50 SS |
1334 | /* |
1335 | * This represents bytes 464..511 in the memory layout exported through | |
1336 | * the REGSET_XSTATE interface. | |
1337 | */ | |
1338 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; | |
1339 | ||
404f6aac | 1340 | void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask) |
5b3efd50 SS |
1341 | { |
1342 | #ifdef CONFIG_X86_64 | |
1343 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1344 | #endif | |
1345 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1346 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); | |
1347 | #endif | |
1348 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; | |
1349 | } | |
1350 | ||
070459d9 RM |
1351 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
1352 | { | |
1353 | #ifdef CONFIG_IA32_EMULATION | |
cc87324b | 1354 | if (!user_64bit_mode(task_pt_regs(task))) |
070459d9 RM |
1355 | #endif |
1356 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1357 | return &user_x86_32_view; | |
1358 | #endif | |
1359 | #ifdef CONFIG_X86_64 | |
1360 | return &user_x86_64_view; | |
1361 | #endif | |
1362 | } | |
1363 | ||
7f38551f ON |
1364 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1365 | int error_code, int si_code) | |
1da177e4 | 1366 | { |
51e7dc70 | 1367 | tsk->thread.trap_nr = X86_TRAP_DB; |
1da177e4 LT |
1368 | tsk->thread.error_code = error_code; |
1369 | ||
27b46d76 | 1370 | /* Send us the fake SIGTRAP */ |
0a996c1a EB |
1371 | force_sig_fault(SIGTRAP, si_code, |
1372 | user_mode(regs) ? (void __user *)regs->ip : NULL, tsk); | |
7f38551f | 1373 | } |
1da177e4 | 1374 | |
efc463ad | 1375 | void user_single_step_report(struct pt_regs *regs) |
7f38551f | 1376 | { |
efc463ad | 1377 | send_sigtrap(current, regs, 0, TRAP_BRKPT); |
1da177e4 | 1378 | } |