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