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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/ptrace.c | |
3 | * | |
4 | * By Ross Biro 1/23/92 | |
5 | * edited by Linus Torvalds | |
6 | * ARM modifications Copyright (C) 2000 Russell King | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
1da177e4 | 12 | #include <linux/kernel.h> |
3f07c014 | 13 | #include <linux/sched/signal.h> |
68db0cf1 | 14 | #include <linux/sched/task_stack.h> |
1da177e4 | 15 | #include <linux/mm.h> |
ce8b9d25 | 16 | #include <linux/elf.h> |
1da177e4 | 17 | #include <linux/smp.h> |
1da177e4 LT |
18 | #include <linux/ptrace.h> |
19 | #include <linux/user.h> | |
20 | #include <linux/security.h> | |
21 | #include <linux/init.h> | |
7ed20e1a | 22 | #include <linux/signal.h> |
33fa9b13 | 23 | #include <linux/uaccess.h> |
864232fa WD |
24 | #include <linux/perf_event.h> |
25 | #include <linux/hw_breakpoint.h> | |
5be6f62b | 26 | #include <linux/regset.h> |
5180bb39 | 27 | #include <linux/audit.h> |
0693bf68 | 28 | #include <linux/tracehook.h> |
ad82cc08 | 29 | #include <linux/unistd.h> |
1da177e4 | 30 | |
1da177e4 | 31 | #include <asm/pgtable.h> |
1da177e4 LT |
32 | #include <asm/traps.h> |
33 | ||
1f66e06f WF |
34 | #define CREATE_TRACE_POINTS |
35 | #include <trace/events/syscalls.h> | |
36 | ||
1da177e4 LT |
37 | #define REG_PC 15 |
38 | #define REG_PSR 16 | |
39 | /* | |
40 | * does not yet catch signals sent when the child dies. | |
41 | * in exit.c or in signal.c. | |
42 | */ | |
43 | ||
44 | #if 0 | |
45 | /* | |
46 | * Breakpoint SWI instruction: SWI &9F0001 | |
47 | */ | |
48 | #define BREAKINST_ARM 0xef9f0001 | |
49 | #define BREAKINST_THUMB 0xdf00 /* fill this in later */ | |
50 | #else | |
51 | /* | |
52 | * New breakpoints - use an undefined instruction. The ARM architecture | |
53 | * reference manual guarantees that the following instruction space | |
54 | * will produce an undefined instruction exception on all CPUs: | |
55 | * | |
56 | * ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx | |
57 | * Thumb: 1101 1110 xxxx xxxx | |
58 | */ | |
59 | #define BREAKINST_ARM 0xe7f001f0 | |
60 | #define BREAKINST_THUMB 0xde01 | |
61 | #endif | |
62 | ||
e513f8bf WD |
63 | struct pt_regs_offset { |
64 | const char *name; | |
65 | int offset; | |
66 | }; | |
67 | ||
68 | #define REG_OFFSET_NAME(r) \ | |
69 | {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)} | |
70 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
71 | ||
72 | static const struct pt_regs_offset regoffset_table[] = { | |
73 | REG_OFFSET_NAME(r0), | |
74 | REG_OFFSET_NAME(r1), | |
75 | REG_OFFSET_NAME(r2), | |
76 | REG_OFFSET_NAME(r3), | |
77 | REG_OFFSET_NAME(r4), | |
78 | REG_OFFSET_NAME(r5), | |
79 | REG_OFFSET_NAME(r6), | |
80 | REG_OFFSET_NAME(r7), | |
81 | REG_OFFSET_NAME(r8), | |
82 | REG_OFFSET_NAME(r9), | |
83 | REG_OFFSET_NAME(r10), | |
84 | REG_OFFSET_NAME(fp), | |
85 | REG_OFFSET_NAME(ip), | |
86 | REG_OFFSET_NAME(sp), | |
87 | REG_OFFSET_NAME(lr), | |
88 | REG_OFFSET_NAME(pc), | |
89 | REG_OFFSET_NAME(cpsr), | |
90 | REG_OFFSET_NAME(ORIG_r0), | |
91 | REG_OFFSET_END, | |
92 | }; | |
93 | ||
94 | /** | |
95 | * regs_query_register_offset() - query register offset from its name | |
96 | * @name: the name of a register | |
97 | * | |
98 | * regs_query_register_offset() returns the offset of a register in struct | |
99 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
100 | */ | |
101 | int regs_query_register_offset(const char *name) | |
102 | { | |
103 | const struct pt_regs_offset *roff; | |
104 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
105 | if (!strcmp(roff->name, name)) | |
106 | return roff->offset; | |
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | /** | |
111 | * regs_query_register_name() - query register name from its offset | |
112 | * @offset: the offset of a register in struct pt_regs. | |
113 | * | |
114 | * regs_query_register_name() returns the name of a register from its | |
115 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
116 | */ | |
117 | const char *regs_query_register_name(unsigned int offset) | |
118 | { | |
119 | const struct pt_regs_offset *roff; | |
120 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
121 | if (roff->offset == offset) | |
122 | return roff->name; | |
123 | return NULL; | |
124 | } | |
125 | ||
126 | /** | |
127 | * regs_within_kernel_stack() - check the address in the stack | |
128 | * @regs: pt_regs which contains kernel stack pointer. | |
129 | * @addr: address which is checked. | |
130 | * | |
131 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). | |
132 | * If @addr is within the kernel stack, it returns true. If not, returns false. | |
133 | */ | |
134 | bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
135 | { | |
136 | return ((addr & ~(THREAD_SIZE - 1)) == | |
137 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); | |
138 | } | |
139 | ||
140 | /** | |
141 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
142 | * @regs: pt_regs which contains kernel stack pointer. | |
143 | * @n: stack entry number. | |
144 | * | |
145 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
146 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, | |
147 | * this returns 0. | |
148 | */ | |
149 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
150 | { | |
151 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); | |
152 | addr += n; | |
153 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) | |
154 | return *addr; | |
155 | else | |
156 | return 0; | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* |
160 | * this routine will get a word off of the processes privileged stack. | |
161 | * the offset is how far from the base addr as stored in the THREAD. | |
162 | * this routine assumes that all the privileged stacks are in our | |
163 | * data space. | |
164 | */ | |
165 | static inline long get_user_reg(struct task_struct *task, int offset) | |
166 | { | |
815d5ec8 | 167 | return task_pt_regs(task)->uregs[offset]; |
1da177e4 LT |
168 | } |
169 | ||
170 | /* | |
171 | * this routine will put a word on the processes privileged stack. | |
172 | * the offset is how far from the base addr as stored in the THREAD. | |
173 | * this routine assumes that all the privileged stacks are in our | |
174 | * data space. | |
175 | */ | |
176 | static inline int | |
177 | put_user_reg(struct task_struct *task, int offset, long data) | |
178 | { | |
815d5ec8 | 179 | struct pt_regs newregs, *regs = task_pt_regs(task); |
1da177e4 LT |
180 | int ret = -EINVAL; |
181 | ||
182 | newregs = *regs; | |
183 | newregs.uregs[offset] = data; | |
184 | ||
185 | if (valid_user_regs(&newregs)) { | |
186 | regs->uregs[offset] = data; | |
187 | ret = 0; | |
188 | } | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
1da177e4 LT |
193 | /* |
194 | * Called by kernel/ptrace.c when detaching.. | |
1da177e4 LT |
195 | */ |
196 | void ptrace_disable(struct task_struct *child) | |
197 | { | |
425fc47a | 198 | /* Nothing to do. */ |
1da177e4 LT |
199 | } |
200 | ||
201 | /* | |
202 | * Handle hitting a breakpoint. | |
203 | */ | |
204 | void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) | |
205 | { | |
206 | siginfo_t info; | |
207 | ||
1da177e4 LT |
208 | info.si_signo = SIGTRAP; |
209 | info.si_errno = 0; | |
210 | info.si_code = TRAP_BRKPT; | |
211 | info.si_addr = (void __user *)instruction_pointer(regs); | |
212 | ||
213 | force_sig_info(SIGTRAP, &info, tsk); | |
214 | } | |
215 | ||
216 | static int break_trap(struct pt_regs *regs, unsigned int instr) | |
217 | { | |
218 | ptrace_break(current, regs); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static struct undef_hook arm_break_hook = { | |
223 | .instr_mask = 0x0fffffff, | |
224 | .instr_val = 0x07f001f0, | |
225 | .cpsr_mask = PSR_T_BIT, | |
226 | .cpsr_val = 0, | |
227 | .fn = break_trap, | |
228 | }; | |
229 | ||
230 | static struct undef_hook thumb_break_hook = { | |
231 | .instr_mask = 0xffff, | |
232 | .instr_val = 0xde01, | |
233 | .cpsr_mask = PSR_T_BIT, | |
234 | .cpsr_val = PSR_T_BIT, | |
235 | .fn = break_trap, | |
236 | }; | |
237 | ||
d23bc1b3 | 238 | static struct undef_hook thumb2_break_hook = { |
592201a9 JM |
239 | .instr_mask = 0xffffffff, |
240 | .instr_val = 0xf7f0a000, | |
d23bc1b3 DJ |
241 | .cpsr_mask = PSR_T_BIT, |
242 | .cpsr_val = PSR_T_BIT, | |
592201a9 | 243 | .fn = break_trap, |
d23bc1b3 DJ |
244 | }; |
245 | ||
1da177e4 LT |
246 | static int __init ptrace_break_init(void) |
247 | { | |
248 | register_undef_hook(&arm_break_hook); | |
249 | register_undef_hook(&thumb_break_hook); | |
d23bc1b3 | 250 | register_undef_hook(&thumb2_break_hook); |
1da177e4 LT |
251 | return 0; |
252 | } | |
253 | ||
254 | core_initcall(ptrace_break_init); | |
255 | ||
256 | /* | |
257 | * Read the word at offset "off" into the "struct user". We | |
258 | * actually access the pt_regs stored on the kernel stack. | |
259 | */ | |
260 | static int ptrace_read_user(struct task_struct *tsk, unsigned long off, | |
261 | unsigned long __user *ret) | |
262 | { | |
263 | unsigned long tmp; | |
264 | ||
5a4f5da5 | 265 | if (off & 3) |
1da177e4 LT |
266 | return -EIO; |
267 | ||
268 | tmp = 0; | |
68b7f715 PB |
269 | if (off == PT_TEXT_ADDR) |
270 | tmp = tsk->mm->start_code; | |
271 | else if (off == PT_DATA_ADDR) | |
272 | tmp = tsk->mm->start_data; | |
273 | else if (off == PT_TEXT_END_ADDR) | |
274 | tmp = tsk->mm->end_code; | |
275 | else if (off < sizeof(struct pt_regs)) | |
1da177e4 | 276 | tmp = get_user_reg(tsk, off >> 2); |
5a4f5da5 WD |
277 | else if (off >= sizeof(struct user)) |
278 | return -EIO; | |
1da177e4 LT |
279 | |
280 | return put_user(tmp, ret); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Write the word at offset "off" into "struct user". We | |
285 | * actually access the pt_regs stored on the kernel stack. | |
286 | */ | |
287 | static int ptrace_write_user(struct task_struct *tsk, unsigned long off, | |
288 | unsigned long val) | |
289 | { | |
290 | if (off & 3 || off >= sizeof(struct user)) | |
291 | return -EIO; | |
292 | ||
293 | if (off >= sizeof(struct pt_regs)) | |
294 | return 0; | |
295 | ||
296 | return put_user_reg(tsk, off >> 2, val); | |
297 | } | |
298 | ||
1da177e4 LT |
299 | #ifdef CONFIG_IWMMXT |
300 | ||
301 | /* | |
302 | * Get the child iWMMXt state. | |
303 | */ | |
304 | static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) | |
305 | { | |
e7c1b32f | 306 | struct thread_info *thread = task_thread_info(tsk); |
1da177e4 LT |
307 | |
308 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) | |
309 | return -ENODATA; | |
310 | iwmmxt_task_disable(thread); /* force it to ram */ | |
cdaabbd7 RK |
311 | return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) |
312 | ? -EFAULT : 0; | |
1da177e4 LT |
313 | } |
314 | ||
315 | /* | |
316 | * Set the child iWMMXt state. | |
317 | */ | |
318 | static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) | |
319 | { | |
e7c1b32f | 320 | struct thread_info *thread = task_thread_info(tsk); |
1da177e4 LT |
321 | |
322 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) | |
323 | return -EACCES; | |
324 | iwmmxt_task_release(thread); /* force a reload */ | |
17320a96 | 325 | return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) |
cdaabbd7 | 326 | ? -EFAULT : 0; |
1da177e4 LT |
327 | } |
328 | ||
329 | #endif | |
330 | ||
5429b060 LB |
331 | #ifdef CONFIG_CRUNCH |
332 | /* | |
333 | * Get the child Crunch state. | |
334 | */ | |
335 | static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp) | |
336 | { | |
337 | struct thread_info *thread = task_thread_info(tsk); | |
338 | ||
339 | crunch_task_disable(thread); /* force it to ram */ | |
340 | return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE) | |
341 | ? -EFAULT : 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Set the child Crunch state. | |
346 | */ | |
347 | static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) | |
348 | { | |
349 | struct thread_info *thread = task_thread_info(tsk); | |
350 | ||
351 | crunch_task_release(thread); /* force a reload */ | |
352 | return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE) | |
353 | ? -EFAULT : 0; | |
354 | } | |
355 | #endif | |
356 | ||
864232fa WD |
357 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
358 | /* | |
359 | * Convert a virtual register number into an index for a thread_info | |
360 | * breakpoint array. Breakpoints are identified using positive numbers | |
361 | * whilst watchpoints are negative. The registers are laid out as pairs | |
362 | * of (address, control), each pair mapping to a unique hw_breakpoint struct. | |
363 | * Register 0 is reserved for describing resource information. | |
364 | */ | |
365 | static int ptrace_hbp_num_to_idx(long num) | |
366 | { | |
367 | if (num < 0) | |
368 | num = (ARM_MAX_BRP << 1) - num; | |
369 | return (num - 1) >> 1; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Returns the virtual register number for the address of the | |
374 | * breakpoint at index idx. | |
375 | */ | |
376 | static long ptrace_hbp_idx_to_num(int idx) | |
377 | { | |
378 | long mid = ARM_MAX_BRP << 1; | |
379 | long num = (idx << 1) + 1; | |
380 | return num > mid ? mid - num : num; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Handle hitting a HW-breakpoint. | |
385 | */ | |
a8b0ca17 | 386 | static void ptrace_hbptriggered(struct perf_event *bp, |
864232fa WD |
387 | struct perf_sample_data *data, |
388 | struct pt_regs *regs) | |
389 | { | |
390 | struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); | |
391 | long num; | |
392 | int i; | |
393 | siginfo_t info; | |
394 | ||
395 | for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) | |
396 | if (current->thread.debug.hbp[i] == bp) | |
397 | break; | |
398 | ||
399 | num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); | |
400 | ||
401 | info.si_signo = SIGTRAP; | |
402 | info.si_errno = (int)num; | |
403 | info.si_code = TRAP_HWBKPT; | |
404 | info.si_addr = (void __user *)(bkpt->trigger); | |
405 | ||
406 | force_sig_info(SIGTRAP, &info, current); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Set ptrace breakpoint pointers to zero for this task. | |
411 | * This is required in order to prevent child processes from unregistering | |
412 | * breakpoints held by their parent. | |
413 | */ | |
414 | void clear_ptrace_hw_breakpoint(struct task_struct *tsk) | |
415 | { | |
416 | memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp)); | |
417 | } | |
418 | ||
419 | /* | |
420 | * Unregister breakpoints from this task and reset the pointers in | |
421 | * the thread_struct. | |
422 | */ | |
423 | void flush_ptrace_hw_breakpoint(struct task_struct *tsk) | |
424 | { | |
425 | int i; | |
426 | struct thread_struct *t = &tsk->thread; | |
427 | ||
428 | for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) { | |
429 | if (t->debug.hbp[i]) { | |
430 | unregister_hw_breakpoint(t->debug.hbp[i]); | |
431 | t->debug.hbp[i] = NULL; | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
436 | static u32 ptrace_get_hbp_resource_info(void) | |
437 | { | |
438 | u8 num_brps, num_wrps, debug_arch, wp_len; | |
439 | u32 reg = 0; | |
440 | ||
441 | num_brps = hw_breakpoint_slots(TYPE_INST); | |
442 | num_wrps = hw_breakpoint_slots(TYPE_DATA); | |
443 | debug_arch = arch_get_debug_arch(); | |
444 | wp_len = arch_get_max_wp_len(); | |
445 | ||
446 | reg |= debug_arch; | |
447 | reg <<= 8; | |
448 | reg |= wp_len; | |
449 | reg <<= 8; | |
450 | reg |= num_wrps; | |
451 | reg <<= 8; | |
452 | reg |= num_brps; | |
453 | ||
454 | return reg; | |
455 | } | |
456 | ||
457 | static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) | |
458 | { | |
459 | struct perf_event_attr attr; | |
460 | ||
461 | ptrace_breakpoint_init(&attr); | |
462 | ||
463 | /* Initialise fields to sane defaults. */ | |
464 | attr.bp_addr = 0; | |
465 | attr.bp_len = HW_BREAKPOINT_LEN_4; | |
466 | attr.bp_type = type; | |
467 | attr.disabled = 1; | |
468 | ||
4dc0da86 AK |
469 | return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, |
470 | tsk); | |
864232fa WD |
471 | } |
472 | ||
473 | static int ptrace_gethbpregs(struct task_struct *tsk, long num, | |
474 | unsigned long __user *data) | |
475 | { | |
476 | u32 reg; | |
477 | int idx, ret = 0; | |
478 | struct perf_event *bp; | |
479 | struct arch_hw_breakpoint_ctrl arch_ctrl; | |
480 | ||
481 | if (num == 0) { | |
482 | reg = ptrace_get_hbp_resource_info(); | |
483 | } else { | |
484 | idx = ptrace_hbp_num_to_idx(num); | |
485 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { | |
486 | ret = -EINVAL; | |
487 | goto out; | |
488 | } | |
489 | ||
490 | bp = tsk->thread.debug.hbp[idx]; | |
491 | if (!bp) { | |
492 | reg = 0; | |
493 | goto put; | |
494 | } | |
495 | ||
496 | arch_ctrl = counter_arch_bp(bp)->ctrl; | |
497 | ||
498 | /* | |
499 | * Fix up the len because we may have adjusted it | |
500 | * to compensate for an unaligned address. | |
501 | */ | |
502 | while (!(arch_ctrl.len & 0x1)) | |
503 | arch_ctrl.len >>= 1; | |
504 | ||
ba55d3db | 505 | if (num & 0x1) |
864232fa | 506 | reg = bp->attr.bp_addr; |
ba55d3db WD |
507 | else |
508 | reg = encode_ctrl_reg(arch_ctrl); | |
864232fa WD |
509 | } |
510 | ||
511 | put: | |
512 | if (put_user(reg, data)) | |
513 | ret = -EFAULT; | |
514 | ||
515 | out: | |
516 | return ret; | |
517 | } | |
518 | ||
519 | static int ptrace_sethbpregs(struct task_struct *tsk, long num, | |
520 | unsigned long __user *data) | |
521 | { | |
522 | int idx, gen_len, gen_type, implied_type, ret = 0; | |
523 | u32 user_val; | |
524 | struct perf_event *bp; | |
525 | struct arch_hw_breakpoint_ctrl ctrl; | |
526 | struct perf_event_attr attr; | |
527 | ||
528 | if (num == 0) | |
529 | goto out; | |
530 | else if (num < 0) | |
531 | implied_type = HW_BREAKPOINT_RW; | |
532 | else | |
533 | implied_type = HW_BREAKPOINT_X; | |
534 | ||
535 | idx = ptrace_hbp_num_to_idx(num); | |
536 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { | |
537 | ret = -EINVAL; | |
538 | goto out; | |
539 | } | |
540 | ||
541 | if (get_user(user_val, data)) { | |
542 | ret = -EFAULT; | |
543 | goto out; | |
544 | } | |
545 | ||
546 | bp = tsk->thread.debug.hbp[idx]; | |
547 | if (!bp) { | |
548 | bp = ptrace_hbp_create(tsk, implied_type); | |
549 | if (IS_ERR(bp)) { | |
550 | ret = PTR_ERR(bp); | |
551 | goto out; | |
552 | } | |
553 | tsk->thread.debug.hbp[idx] = bp; | |
554 | } | |
555 | ||
556 | attr = bp->attr; | |
557 | ||
558 | if (num & 0x1) { | |
559 | /* Address */ | |
560 | attr.bp_addr = user_val; | |
561 | } else { | |
562 | /* Control */ | |
563 | decode_ctrl_reg(user_val, &ctrl); | |
564 | ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type); | |
565 | if (ret) | |
566 | goto out; | |
567 | ||
568 | if ((gen_type & implied_type) != gen_type) { | |
ce9b1b09 WD |
569 | ret = -EINVAL; |
570 | goto out; | |
864232fa WD |
571 | } |
572 | ||
573 | attr.bp_len = gen_len; | |
574 | attr.bp_type = gen_type; | |
575 | attr.disabled = !ctrl.enabled; | |
576 | } | |
577 | ||
578 | ret = modify_user_hw_breakpoint(bp, &attr); | |
579 | out: | |
580 | return ret; | |
581 | } | |
582 | #endif | |
583 | ||
5be6f62b DM |
584 | /* regset get/set implementations */ |
585 | ||
586 | static int gpr_get(struct task_struct *target, | |
587 | const struct user_regset *regset, | |
588 | unsigned int pos, unsigned int count, | |
589 | void *kbuf, void __user *ubuf) | |
590 | { | |
591 | struct pt_regs *regs = task_pt_regs(target); | |
592 | ||
593 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
594 | regs, | |
595 | 0, sizeof(*regs)); | |
596 | } | |
597 | ||
598 | static int gpr_set(struct task_struct *target, | |
599 | const struct user_regset *regset, | |
600 | unsigned int pos, unsigned int count, | |
601 | const void *kbuf, const void __user *ubuf) | |
602 | { | |
603 | int ret; | |
228dbbfb | 604 | struct pt_regs newregs = *task_pt_regs(target); |
5be6f62b DM |
605 | |
606 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
607 | &newregs, | |
608 | 0, sizeof(newregs)); | |
609 | if (ret) | |
610 | return ret; | |
611 | ||
612 | if (!valid_user_regs(&newregs)) | |
613 | return -EINVAL; | |
614 | ||
615 | *task_pt_regs(target) = newregs; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | static int fpa_get(struct task_struct *target, | |
620 | const struct user_regset *regset, | |
621 | unsigned int pos, unsigned int count, | |
622 | void *kbuf, void __user *ubuf) | |
623 | { | |
624 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
625 | &task_thread_info(target)->fpstate, | |
626 | 0, sizeof(struct user_fp)); | |
627 | } | |
628 | ||
629 | static int fpa_set(struct task_struct *target, | |
630 | const struct user_regset *regset, | |
631 | unsigned int pos, unsigned int count, | |
632 | const void *kbuf, const void __user *ubuf) | |
633 | { | |
634 | struct thread_info *thread = task_thread_info(target); | |
635 | ||
636 | thread->used_cp[1] = thread->used_cp[2] = 1; | |
637 | ||
638 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
639 | &thread->fpstate, | |
640 | 0, sizeof(struct user_fp)); | |
641 | } | |
642 | ||
643 | #ifdef CONFIG_VFP | |
644 | /* | |
645 | * VFP register get/set implementations. | |
646 | * | |
647 | * With respect to the kernel, struct user_fp is divided into three chunks: | |
648 | * 16 or 32 real VFP registers (d0-d15 or d0-31) | |
649 | * These are transferred to/from the real registers in the task's | |
650 | * vfp_hard_struct. The number of registers depends on the kernel | |
651 | * configuration. | |
652 | * | |
653 | * 16 or 0 fake VFP registers (d16-d31 or empty) | |
654 | * i.e., the user_vfp structure has space for 32 registers even if | |
655 | * the kernel doesn't have them all. | |
656 | * | |
657 | * vfp_get() reads this chunk as zero where applicable | |
658 | * vfp_set() ignores this chunk | |
659 | * | |
660 | * 1 word for the FPSCR | |
661 | * | |
662 | * The bounds-checking logic built into user_regset_copyout and friends | |
663 | * means that we can make a simple sequence of calls to map the relevant data | |
664 | * to/from the specified slice of the user regset structure. | |
665 | */ | |
666 | static int vfp_get(struct task_struct *target, | |
667 | const struct user_regset *regset, | |
668 | unsigned int pos, unsigned int count, | |
669 | void *kbuf, void __user *ubuf) | |
670 | { | |
671 | int ret; | |
672 | struct thread_info *thread = task_thread_info(target); | |
673 | struct vfp_hard_struct const *vfp = &thread->vfpstate.hard; | |
674 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); | |
675 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); | |
676 | ||
677 | vfp_sync_hwstate(thread); | |
678 | ||
679 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
680 | &vfp->fpregs, | |
681 | user_fpregs_offset, | |
682 | user_fpregs_offset + sizeof(vfp->fpregs)); | |
683 | if (ret) | |
684 | return ret; | |
685 | ||
686 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
687 | user_fpregs_offset + sizeof(vfp->fpregs), | |
688 | user_fpscr_offset); | |
689 | if (ret) | |
690 | return ret; | |
691 | ||
692 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
693 | &vfp->fpscr, | |
694 | user_fpscr_offset, | |
695 | user_fpscr_offset + sizeof(vfp->fpscr)); | |
696 | } | |
697 | ||
698 | /* | |
699 | * For vfp_set() a read-modify-write is done on the VFP registers, | |
700 | * in order to avoid writing back a half-modified set of registers on | |
701 | * failure. | |
702 | */ | |
703 | static int vfp_set(struct task_struct *target, | |
704 | const struct user_regset *regset, | |
705 | unsigned int pos, unsigned int count, | |
706 | const void *kbuf, const void __user *ubuf) | |
707 | { | |
708 | int ret; | |
709 | struct thread_info *thread = task_thread_info(target); | |
247f4993 | 710 | struct vfp_hard_struct new_vfp; |
5be6f62b DM |
711 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); |
712 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); | |
713 | ||
247f4993 DM |
714 | vfp_sync_hwstate(thread); |
715 | new_vfp = thread->vfpstate.hard; | |
716 | ||
5be6f62b DM |
717 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
718 | &new_vfp.fpregs, | |
719 | user_fpregs_offset, | |
720 | user_fpregs_offset + sizeof(new_vfp.fpregs)); | |
721 | if (ret) | |
722 | return ret; | |
723 | ||
724 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
725 | user_fpregs_offset + sizeof(new_vfp.fpregs), | |
726 | user_fpscr_offset); | |
727 | if (ret) | |
728 | return ret; | |
729 | ||
730 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
731 | &new_vfp.fpscr, | |
732 | user_fpscr_offset, | |
733 | user_fpscr_offset + sizeof(new_vfp.fpscr)); | |
734 | if (ret) | |
735 | return ret; | |
736 | ||
8130b9d7 | 737 | thread->vfpstate.hard = new_vfp; |
e2dfb4b8 | 738 | vfp_flush_hwstate(thread); |
5be6f62b DM |
739 | |
740 | return 0; | |
741 | } | |
742 | #endif /* CONFIG_VFP */ | |
743 | ||
744 | enum arm_regset { | |
745 | REGSET_GPR, | |
746 | REGSET_FPR, | |
747 | #ifdef CONFIG_VFP | |
748 | REGSET_VFP, | |
749 | #endif | |
750 | }; | |
751 | ||
752 | static const struct user_regset arm_regsets[] = { | |
753 | [REGSET_GPR] = { | |
754 | .core_note_type = NT_PRSTATUS, | |
755 | .n = ELF_NGREG, | |
756 | .size = sizeof(u32), | |
757 | .align = sizeof(u32), | |
758 | .get = gpr_get, | |
759 | .set = gpr_set | |
760 | }, | |
761 | [REGSET_FPR] = { | |
762 | /* | |
763 | * For the FPA regs in fpstate, the real fields are a mixture | |
764 | * of sizes, so pretend that the registers are word-sized: | |
765 | */ | |
766 | .core_note_type = NT_PRFPREG, | |
767 | .n = sizeof(struct user_fp) / sizeof(u32), | |
768 | .size = sizeof(u32), | |
769 | .align = sizeof(u32), | |
770 | .get = fpa_get, | |
771 | .set = fpa_set | |
772 | }, | |
773 | #ifdef CONFIG_VFP | |
774 | [REGSET_VFP] = { | |
775 | /* | |
776 | * Pretend that the VFP regs are word-sized, since the FPSCR is | |
777 | * a single word dangling at the end of struct user_vfp: | |
778 | */ | |
779 | .core_note_type = NT_ARM_VFP, | |
780 | .n = ARM_VFPREGS_SIZE / sizeof(u32), | |
781 | .size = sizeof(u32), | |
782 | .align = sizeof(u32), | |
783 | .get = vfp_get, | |
784 | .set = vfp_set | |
785 | }, | |
786 | #endif /* CONFIG_VFP */ | |
787 | }; | |
788 | ||
789 | static const struct user_regset_view user_arm_view = { | |
790 | .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, | |
791 | .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets) | |
792 | }; | |
793 | ||
794 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
795 | { | |
796 | return &user_arm_view; | |
797 | } | |
798 | ||
9b05a69e NK |
799 | long arch_ptrace(struct task_struct *child, long request, |
800 | unsigned long addr, unsigned long data) | |
1da177e4 | 801 | { |
1da177e4 | 802 | int ret; |
b640a0d1 | 803 | unsigned long __user *datap = (unsigned long __user *) data; |
1da177e4 LT |
804 | |
805 | switch (request) { | |
1da177e4 | 806 | case PTRACE_PEEKUSR: |
b640a0d1 | 807 | ret = ptrace_read_user(child, addr, datap); |
1da177e4 LT |
808 | break; |
809 | ||
1da177e4 LT |
810 | case PTRACE_POKEUSR: |
811 | ret = ptrace_write_user(child, addr, data); | |
812 | break; | |
813 | ||
1da177e4 | 814 | case PTRACE_GETREGS: |
5be6f62b DM |
815 | ret = copy_regset_to_user(child, |
816 | &user_arm_view, REGSET_GPR, | |
817 | 0, sizeof(struct pt_regs), | |
818 | datap); | |
1da177e4 LT |
819 | break; |
820 | ||
821 | case PTRACE_SETREGS: | |
5be6f62b DM |
822 | ret = copy_regset_from_user(child, |
823 | &user_arm_view, REGSET_GPR, | |
824 | 0, sizeof(struct pt_regs), | |
825 | datap); | |
1da177e4 LT |
826 | break; |
827 | ||
828 | case PTRACE_GETFPREGS: | |
5be6f62b DM |
829 | ret = copy_regset_to_user(child, |
830 | &user_arm_view, REGSET_FPR, | |
831 | 0, sizeof(union fp_state), | |
832 | datap); | |
1da177e4 | 833 | break; |
5be6f62b | 834 | |
1da177e4 | 835 | case PTRACE_SETFPREGS: |
5be6f62b DM |
836 | ret = copy_regset_from_user(child, |
837 | &user_arm_view, REGSET_FPR, | |
838 | 0, sizeof(union fp_state), | |
839 | datap); | |
1da177e4 LT |
840 | break; |
841 | ||
842 | #ifdef CONFIG_IWMMXT | |
843 | case PTRACE_GETWMMXREGS: | |
b640a0d1 | 844 | ret = ptrace_getwmmxregs(child, datap); |
1da177e4 LT |
845 | break; |
846 | ||
847 | case PTRACE_SETWMMXREGS: | |
b640a0d1 | 848 | ret = ptrace_setwmmxregs(child, datap); |
1da177e4 LT |
849 | break; |
850 | #endif | |
851 | ||
852 | case PTRACE_GET_THREAD_AREA: | |
a4780ade | 853 | ret = put_user(task_thread_info(child)->tp_value[0], |
b640a0d1 | 854 | datap); |
1da177e4 LT |
855 | break; |
856 | ||
3f471126 | 857 | case PTRACE_SET_SYSCALL: |
5ba6d3fe | 858 | task_thread_info(child)->syscall = data; |
3f471126 | 859 | ret = 0; |
3f471126 NP |
860 | break; |
861 | ||
5429b060 LB |
862 | #ifdef CONFIG_CRUNCH |
863 | case PTRACE_GETCRUNCHREGS: | |
b640a0d1 | 864 | ret = ptrace_getcrunchregs(child, datap); |
5429b060 LB |
865 | break; |
866 | ||
867 | case PTRACE_SETCRUNCHREGS: | |
b640a0d1 | 868 | ret = ptrace_setcrunchregs(child, datap); |
5429b060 LB |
869 | break; |
870 | #endif | |
871 | ||
3d1228ea CM |
872 | #ifdef CONFIG_VFP |
873 | case PTRACE_GETVFPREGS: | |
5be6f62b DM |
874 | ret = copy_regset_to_user(child, |
875 | &user_arm_view, REGSET_VFP, | |
876 | 0, ARM_VFPREGS_SIZE, | |
877 | datap); | |
3d1228ea CM |
878 | break; |
879 | ||
880 | case PTRACE_SETVFPREGS: | |
5be6f62b DM |
881 | ret = copy_regset_from_user(child, |
882 | &user_arm_view, REGSET_VFP, | |
883 | 0, ARM_VFPREGS_SIZE, | |
884 | datap); | |
3d1228ea CM |
885 | break; |
886 | #endif | |
887 | ||
864232fa WD |
888 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
889 | case PTRACE_GETHBPREGS: | |
890 | ret = ptrace_gethbpregs(child, addr, | |
891 | (unsigned long __user *)data); | |
892 | break; | |
893 | case PTRACE_SETHBPREGS: | |
894 | ret = ptrace_sethbpregs(child, addr, | |
895 | (unsigned long __user *)data); | |
896 | break; | |
897 | #endif | |
898 | ||
1da177e4 LT |
899 | default: |
900 | ret = ptrace_request(child, request, addr, data); | |
901 | break; | |
902 | } | |
903 | ||
904 | return ret; | |
905 | } | |
906 | ||
ad722541 WD |
907 | enum ptrace_syscall_dir { |
908 | PTRACE_SYSCALL_ENTER = 0, | |
909 | PTRACE_SYSCALL_EXIT, | |
910 | }; | |
911 | ||
42309ab4 | 912 | static void tracehook_report_syscall(struct pt_regs *regs, |
9b790d71 | 913 | enum ptrace_syscall_dir dir) |
1da177e4 LT |
914 | { |
915 | unsigned long ip; | |
916 | ||
6a68b6f5 WD |
917 | /* |
918 | * IP is used to denote syscall entry/exit: | |
919 | * IP = 0 -> entry, =1 -> exit | |
920 | */ | |
921 | ip = regs->ARM_ip; | |
ad722541 | 922 | regs->ARM_ip = dir; |
6a68b6f5 | 923 | |
ad722541 | 924 | if (dir == PTRACE_SYSCALL_EXIT) |
0693bf68 WF |
925 | tracehook_report_syscall_exit(regs, 0); |
926 | else if (tracehook_report_syscall_entry(regs)) | |
927 | current_thread_info()->syscall = -1; | |
928 | ||
1da177e4 | 929 | regs->ARM_ip = ip; |
ad722541 | 930 | } |
3f471126 | 931 | |
ad722541 WD |
932 | asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno) |
933 | { | |
9b790d71 KC |
934 | current_thread_info()->syscall = scno; |
935 | ||
0f3912fd KC |
936 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
937 | tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER); | |
938 | ||
939 | /* Do seccomp after ptrace; syscall may have changed. */ | |
a4412fc9 | 940 | #ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER |
2f275de5 | 941 | if (secure_computing(NULL) == -1) |
9b790d71 | 942 | return -1; |
a4412fc9 AL |
943 | #else |
944 | /* XXX: remove this once OABI gets fixed */ | |
0f3912fd | 945 | secure_computing_strict(current_thread_info()->syscall); |
a4412fc9 | 946 | #endif |
9b790d71 | 947 | |
0f3912fd | 948 | /* Tracer or seccomp may have changed syscall. */ |
42309ab4 | 949 | scno = current_thread_info()->syscall; |
9b790d71 | 950 | |
1f66e06f | 951 | if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
ebb5e15c | 952 | trace_sys_enter(regs, scno); |
9b790d71 | 953 | |
91397401 EP |
954 | audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, |
955 | regs->ARM_r3); | |
9b790d71 | 956 | |
ebb5e15c | 957 | return scno; |
ad722541 WD |
958 | } |
959 | ||
b10bca0b | 960 | asmlinkage void syscall_trace_exit(struct pt_regs *regs) |
ad722541 | 961 | { |
b10bca0b WD |
962 | /* |
963 | * Audit the syscall before anything else, as a debugger may | |
964 | * come in and change the current registers. | |
965 | */ | |
966 | audit_syscall_exit(regs); | |
9b790d71 | 967 | |
b10bca0b WD |
968 | /* |
969 | * Note that we haven't updated the ->syscall field for the | |
970 | * current thread. This isn't a problem because it will have | |
971 | * been set on syscall entry and there hasn't been an opportunity | |
972 | * for a PTRACE_SET_SYSCALL since then. | |
973 | */ | |
1f66e06f | 974 | if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
b10bca0b | 975 | trace_sys_exit(regs, regs_return_value(regs)); |
9b790d71 | 976 | |
b10bca0b WD |
977 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
978 | tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT); | |
1da177e4 | 979 | } |