]>
Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 28 | |
1da177e4 | 29 | #include <asm/pgtable.h> |
1da177e4 LT |
30 | #include <asm/traps.h> |
31 | ||
1da177e4 LT |
32 | #define REG_PC 15 |
33 | #define REG_PSR 16 | |
34 | /* | |
35 | * does not yet catch signals sent when the child dies. | |
36 | * in exit.c or in signal.c. | |
37 | */ | |
38 | ||
39 | #if 0 | |
40 | /* | |
41 | * Breakpoint SWI instruction: SWI &9F0001 | |
42 | */ | |
43 | #define BREAKINST_ARM 0xef9f0001 | |
44 | #define BREAKINST_THUMB 0xdf00 /* fill this in later */ | |
45 | #else | |
46 | /* | |
47 | * New breakpoints - use an undefined instruction. The ARM architecture | |
48 | * reference manual guarantees that the following instruction space | |
49 | * will produce an undefined instruction exception on all CPUs: | |
50 | * | |
51 | * ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx | |
52 | * Thumb: 1101 1110 xxxx xxxx | |
53 | */ | |
54 | #define BREAKINST_ARM 0xe7f001f0 | |
55 | #define BREAKINST_THUMB 0xde01 | |
56 | #endif | |
57 | ||
e513f8bf WD |
58 | struct pt_regs_offset { |
59 | const char *name; | |
60 | int offset; | |
61 | }; | |
62 | ||
63 | #define REG_OFFSET_NAME(r) \ | |
64 | {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)} | |
65 | #define REG_OFFSET_END {.name = NULL, .offset = 0} | |
66 | ||
67 | static const struct pt_regs_offset regoffset_table[] = { | |
68 | REG_OFFSET_NAME(r0), | |
69 | REG_OFFSET_NAME(r1), | |
70 | REG_OFFSET_NAME(r2), | |
71 | REG_OFFSET_NAME(r3), | |
72 | REG_OFFSET_NAME(r4), | |
73 | REG_OFFSET_NAME(r5), | |
74 | REG_OFFSET_NAME(r6), | |
75 | REG_OFFSET_NAME(r7), | |
76 | REG_OFFSET_NAME(r8), | |
77 | REG_OFFSET_NAME(r9), | |
78 | REG_OFFSET_NAME(r10), | |
79 | REG_OFFSET_NAME(fp), | |
80 | REG_OFFSET_NAME(ip), | |
81 | REG_OFFSET_NAME(sp), | |
82 | REG_OFFSET_NAME(lr), | |
83 | REG_OFFSET_NAME(pc), | |
84 | REG_OFFSET_NAME(cpsr), | |
85 | REG_OFFSET_NAME(ORIG_r0), | |
86 | REG_OFFSET_END, | |
87 | }; | |
88 | ||
89 | /** | |
90 | * regs_query_register_offset() - query register offset from its name | |
91 | * @name: the name of a register | |
92 | * | |
93 | * regs_query_register_offset() returns the offset of a register in struct | |
94 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; | |
95 | */ | |
96 | int regs_query_register_offset(const char *name) | |
97 | { | |
98 | const struct pt_regs_offset *roff; | |
99 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
100 | if (!strcmp(roff->name, name)) | |
101 | return roff->offset; | |
102 | return -EINVAL; | |
103 | } | |
104 | ||
105 | /** | |
106 | * regs_query_register_name() - query register name from its offset | |
107 | * @offset: the offset of a register in struct pt_regs. | |
108 | * | |
109 | * regs_query_register_name() returns the name of a register from its | |
110 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; | |
111 | */ | |
112 | const char *regs_query_register_name(unsigned int offset) | |
113 | { | |
114 | const struct pt_regs_offset *roff; | |
115 | for (roff = regoffset_table; roff->name != NULL; roff++) | |
116 | if (roff->offset == offset) | |
117 | return roff->name; | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | /** | |
122 | * regs_within_kernel_stack() - check the address in the stack | |
123 | * @regs: pt_regs which contains kernel stack pointer. | |
124 | * @addr: address which is checked. | |
125 | * | |
126 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). | |
127 | * If @addr is within the kernel stack, it returns true. If not, returns false. | |
128 | */ | |
129 | bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
130 | { | |
131 | return ((addr & ~(THREAD_SIZE - 1)) == | |
132 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); | |
133 | } | |
134 | ||
135 | /** | |
136 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
137 | * @regs: pt_regs which contains kernel stack pointer. | |
138 | * @n: stack entry number. | |
139 | * | |
140 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
141 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, | |
142 | * this returns 0. | |
143 | */ | |
144 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
145 | { | |
146 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); | |
147 | addr += n; | |
148 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) | |
149 | return *addr; | |
150 | else | |
151 | return 0; | |
152 | } | |
153 | ||
1da177e4 LT |
154 | /* |
155 | * this routine will get a word off of the processes privileged stack. | |
156 | * the offset is how far from the base addr as stored in the THREAD. | |
157 | * this routine assumes that all the privileged stacks are in our | |
158 | * data space. | |
159 | */ | |
160 | static inline long get_user_reg(struct task_struct *task, int offset) | |
161 | { | |
815d5ec8 | 162 | return task_pt_regs(task)->uregs[offset]; |
1da177e4 LT |
163 | } |
164 | ||
165 | /* | |
166 | * this routine will put a word on the processes privileged stack. | |
167 | * the offset is how far from the base addr as stored in the THREAD. | |
168 | * this routine assumes that all the privileged stacks are in our | |
169 | * data space. | |
170 | */ | |
171 | static inline int | |
172 | put_user_reg(struct task_struct *task, int offset, long data) | |
173 | { | |
815d5ec8 | 174 | struct pt_regs newregs, *regs = task_pt_regs(task); |
1da177e4 LT |
175 | int ret = -EINVAL; |
176 | ||
177 | newregs = *regs; | |
178 | newregs.uregs[offset] = data; | |
179 | ||
180 | if (valid_user_regs(&newregs)) { | |
181 | regs->uregs[offset] = data; | |
182 | ret = 0; | |
183 | } | |
184 | ||
185 | return ret; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /* |
189 | * Called by kernel/ptrace.c when detaching.. | |
1da177e4 LT |
190 | */ |
191 | void ptrace_disable(struct task_struct *child) | |
192 | { | |
425fc47a | 193 | /* Nothing to do. */ |
1da177e4 LT |
194 | } |
195 | ||
196 | /* | |
197 | * Handle hitting a breakpoint. | |
198 | */ | |
199 | void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) | |
200 | { | |
201 | siginfo_t info; | |
202 | ||
1da177e4 LT |
203 | info.si_signo = SIGTRAP; |
204 | info.si_errno = 0; | |
205 | info.si_code = TRAP_BRKPT; | |
206 | info.si_addr = (void __user *)instruction_pointer(regs); | |
207 | ||
208 | force_sig_info(SIGTRAP, &info, tsk); | |
209 | } | |
210 | ||
211 | static int break_trap(struct pt_regs *regs, unsigned int instr) | |
212 | { | |
213 | ptrace_break(current, regs); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static struct undef_hook arm_break_hook = { | |
218 | .instr_mask = 0x0fffffff, | |
219 | .instr_val = 0x07f001f0, | |
220 | .cpsr_mask = PSR_T_BIT, | |
221 | .cpsr_val = 0, | |
222 | .fn = break_trap, | |
223 | }; | |
224 | ||
225 | static struct undef_hook thumb_break_hook = { | |
226 | .instr_mask = 0xffff, | |
227 | .instr_val = 0xde01, | |
228 | .cpsr_mask = PSR_T_BIT, | |
229 | .cpsr_val = PSR_T_BIT, | |
230 | .fn = break_trap, | |
231 | }; | |
232 | ||
d23bc1b3 | 233 | static struct undef_hook thumb2_break_hook = { |
592201a9 JM |
234 | .instr_mask = 0xffffffff, |
235 | .instr_val = 0xf7f0a000, | |
d23bc1b3 DJ |
236 | .cpsr_mask = PSR_T_BIT, |
237 | .cpsr_val = PSR_T_BIT, | |
592201a9 | 238 | .fn = break_trap, |
d23bc1b3 DJ |
239 | }; |
240 | ||
1da177e4 LT |
241 | static int __init ptrace_break_init(void) |
242 | { | |
243 | register_undef_hook(&arm_break_hook); | |
244 | register_undef_hook(&thumb_break_hook); | |
d23bc1b3 | 245 | register_undef_hook(&thumb2_break_hook); |
1da177e4 LT |
246 | return 0; |
247 | } | |
248 | ||
249 | core_initcall(ptrace_break_init); | |
250 | ||
251 | /* | |
252 | * Read the word at offset "off" into the "struct user". We | |
253 | * actually access the pt_regs stored on the kernel stack. | |
254 | */ | |
255 | static int ptrace_read_user(struct task_struct *tsk, unsigned long off, | |
256 | unsigned long __user *ret) | |
257 | { | |
258 | unsigned long tmp; | |
259 | ||
5a4f5da5 | 260 | if (off & 3) |
1da177e4 LT |
261 | return -EIO; |
262 | ||
263 | tmp = 0; | |
68b7f715 PB |
264 | if (off == PT_TEXT_ADDR) |
265 | tmp = tsk->mm->start_code; | |
266 | else if (off == PT_DATA_ADDR) | |
267 | tmp = tsk->mm->start_data; | |
268 | else if (off == PT_TEXT_END_ADDR) | |
269 | tmp = tsk->mm->end_code; | |
270 | else if (off < sizeof(struct pt_regs)) | |
1da177e4 | 271 | tmp = get_user_reg(tsk, off >> 2); |
5a4f5da5 WD |
272 | else if (off >= sizeof(struct user)) |
273 | return -EIO; | |
1da177e4 LT |
274 | |
275 | return put_user(tmp, ret); | |
276 | } | |
277 | ||
278 | /* | |
279 | * Write the word at offset "off" into "struct user". We | |
280 | * actually access the pt_regs stored on the kernel stack. | |
281 | */ | |
282 | static int ptrace_write_user(struct task_struct *tsk, unsigned long off, | |
283 | unsigned long val) | |
284 | { | |
285 | if (off & 3 || off >= sizeof(struct user)) | |
286 | return -EIO; | |
287 | ||
288 | if (off >= sizeof(struct pt_regs)) | |
289 | return 0; | |
290 | ||
291 | return put_user_reg(tsk, off >> 2, val); | |
292 | } | |
293 | ||
1da177e4 LT |
294 | #ifdef CONFIG_IWMMXT |
295 | ||
296 | /* | |
297 | * Get the child iWMMXt state. | |
298 | */ | |
299 | static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) | |
300 | { | |
e7c1b32f | 301 | struct thread_info *thread = task_thread_info(tsk); |
1da177e4 LT |
302 | |
303 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) | |
304 | return -ENODATA; | |
305 | iwmmxt_task_disable(thread); /* force it to ram */ | |
cdaabbd7 RK |
306 | return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) |
307 | ? -EFAULT : 0; | |
1da177e4 LT |
308 | } |
309 | ||
310 | /* | |
311 | * Set the child iWMMXt state. | |
312 | */ | |
313 | static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) | |
314 | { | |
e7c1b32f | 315 | struct thread_info *thread = task_thread_info(tsk); |
1da177e4 LT |
316 | |
317 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) | |
318 | return -EACCES; | |
319 | iwmmxt_task_release(thread); /* force a reload */ | |
17320a96 | 320 | return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) |
cdaabbd7 | 321 | ? -EFAULT : 0; |
1da177e4 LT |
322 | } |
323 | ||
324 | #endif | |
325 | ||
5429b060 LB |
326 | #ifdef CONFIG_CRUNCH |
327 | /* | |
328 | * Get the child Crunch state. | |
329 | */ | |
330 | static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp) | |
331 | { | |
332 | struct thread_info *thread = task_thread_info(tsk); | |
333 | ||
334 | crunch_task_disable(thread); /* force it to ram */ | |
335 | return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE) | |
336 | ? -EFAULT : 0; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Set the child Crunch state. | |
341 | */ | |
342 | static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) | |
343 | { | |
344 | struct thread_info *thread = task_thread_info(tsk); | |
345 | ||
346 | crunch_task_release(thread); /* force a reload */ | |
347 | return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE) | |
348 | ? -EFAULT : 0; | |
349 | } | |
350 | #endif | |
351 | ||
864232fa WD |
352 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
353 | /* | |
354 | * Convert a virtual register number into an index for a thread_info | |
355 | * breakpoint array. Breakpoints are identified using positive numbers | |
356 | * whilst watchpoints are negative. The registers are laid out as pairs | |
357 | * of (address, control), each pair mapping to a unique hw_breakpoint struct. | |
358 | * Register 0 is reserved for describing resource information. | |
359 | */ | |
360 | static int ptrace_hbp_num_to_idx(long num) | |
361 | { | |
362 | if (num < 0) | |
363 | num = (ARM_MAX_BRP << 1) - num; | |
364 | return (num - 1) >> 1; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Returns the virtual register number for the address of the | |
369 | * breakpoint at index idx. | |
370 | */ | |
371 | static long ptrace_hbp_idx_to_num(int idx) | |
372 | { | |
373 | long mid = ARM_MAX_BRP << 1; | |
374 | long num = (idx << 1) + 1; | |
375 | return num > mid ? mid - num : num; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Handle hitting a HW-breakpoint. | |
380 | */ | |
a8b0ca17 | 381 | static void ptrace_hbptriggered(struct perf_event *bp, |
864232fa WD |
382 | struct perf_sample_data *data, |
383 | struct pt_regs *regs) | |
384 | { | |
385 | struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); | |
386 | long num; | |
387 | int i; | |
388 | siginfo_t info; | |
389 | ||
390 | for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) | |
391 | if (current->thread.debug.hbp[i] == bp) | |
392 | break; | |
393 | ||
394 | num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); | |
395 | ||
396 | info.si_signo = SIGTRAP; | |
397 | info.si_errno = (int)num; | |
398 | info.si_code = TRAP_HWBKPT; | |
399 | info.si_addr = (void __user *)(bkpt->trigger); | |
400 | ||
401 | force_sig_info(SIGTRAP, &info, current); | |
402 | } | |
403 | ||
404 | /* | |
405 | * Set ptrace breakpoint pointers to zero for this task. | |
406 | * This is required in order to prevent child processes from unregistering | |
407 | * breakpoints held by their parent. | |
408 | */ | |
409 | void clear_ptrace_hw_breakpoint(struct task_struct *tsk) | |
410 | { | |
411 | memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp)); | |
412 | } | |
413 | ||
414 | /* | |
415 | * Unregister breakpoints from this task and reset the pointers in | |
416 | * the thread_struct. | |
417 | */ | |
418 | void flush_ptrace_hw_breakpoint(struct task_struct *tsk) | |
419 | { | |
420 | int i; | |
421 | struct thread_struct *t = &tsk->thread; | |
422 | ||
423 | for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) { | |
424 | if (t->debug.hbp[i]) { | |
425 | unregister_hw_breakpoint(t->debug.hbp[i]); | |
426 | t->debug.hbp[i] = NULL; | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
431 | static u32 ptrace_get_hbp_resource_info(void) | |
432 | { | |
433 | u8 num_brps, num_wrps, debug_arch, wp_len; | |
434 | u32 reg = 0; | |
435 | ||
436 | num_brps = hw_breakpoint_slots(TYPE_INST); | |
437 | num_wrps = hw_breakpoint_slots(TYPE_DATA); | |
438 | debug_arch = arch_get_debug_arch(); | |
439 | wp_len = arch_get_max_wp_len(); | |
440 | ||
441 | reg |= debug_arch; | |
442 | reg <<= 8; | |
443 | reg |= wp_len; | |
444 | reg <<= 8; | |
445 | reg |= num_wrps; | |
446 | reg <<= 8; | |
447 | reg |= num_brps; | |
448 | ||
449 | return reg; | |
450 | } | |
451 | ||
452 | static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) | |
453 | { | |
454 | struct perf_event_attr attr; | |
455 | ||
456 | ptrace_breakpoint_init(&attr); | |
457 | ||
458 | /* Initialise fields to sane defaults. */ | |
459 | attr.bp_addr = 0; | |
460 | attr.bp_len = HW_BREAKPOINT_LEN_4; | |
461 | attr.bp_type = type; | |
462 | attr.disabled = 1; | |
463 | ||
4dc0da86 AK |
464 | return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, |
465 | tsk); | |
864232fa WD |
466 | } |
467 | ||
468 | static int ptrace_gethbpregs(struct task_struct *tsk, long num, | |
469 | unsigned long __user *data) | |
470 | { | |
471 | u32 reg; | |
472 | int idx, ret = 0; | |
473 | struct perf_event *bp; | |
474 | struct arch_hw_breakpoint_ctrl arch_ctrl; | |
475 | ||
476 | if (num == 0) { | |
477 | reg = ptrace_get_hbp_resource_info(); | |
478 | } else { | |
479 | idx = ptrace_hbp_num_to_idx(num); | |
480 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { | |
481 | ret = -EINVAL; | |
482 | goto out; | |
483 | } | |
484 | ||
485 | bp = tsk->thread.debug.hbp[idx]; | |
486 | if (!bp) { | |
487 | reg = 0; | |
488 | goto put; | |
489 | } | |
490 | ||
491 | arch_ctrl = counter_arch_bp(bp)->ctrl; | |
492 | ||
493 | /* | |
494 | * Fix up the len because we may have adjusted it | |
495 | * to compensate for an unaligned address. | |
496 | */ | |
497 | while (!(arch_ctrl.len & 0x1)) | |
498 | arch_ctrl.len >>= 1; | |
499 | ||
ba55d3db | 500 | if (num & 0x1) |
864232fa | 501 | reg = bp->attr.bp_addr; |
ba55d3db WD |
502 | else |
503 | reg = encode_ctrl_reg(arch_ctrl); | |
864232fa WD |
504 | } |
505 | ||
506 | put: | |
507 | if (put_user(reg, data)) | |
508 | ret = -EFAULT; | |
509 | ||
510 | out: | |
511 | return ret; | |
512 | } | |
513 | ||
514 | static int ptrace_sethbpregs(struct task_struct *tsk, long num, | |
515 | unsigned long __user *data) | |
516 | { | |
517 | int idx, gen_len, gen_type, implied_type, ret = 0; | |
518 | u32 user_val; | |
519 | struct perf_event *bp; | |
520 | struct arch_hw_breakpoint_ctrl ctrl; | |
521 | struct perf_event_attr attr; | |
522 | ||
523 | if (num == 0) | |
524 | goto out; | |
525 | else if (num < 0) | |
526 | implied_type = HW_BREAKPOINT_RW; | |
527 | else | |
528 | implied_type = HW_BREAKPOINT_X; | |
529 | ||
530 | idx = ptrace_hbp_num_to_idx(num); | |
531 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { | |
532 | ret = -EINVAL; | |
533 | goto out; | |
534 | } | |
535 | ||
536 | if (get_user(user_val, data)) { | |
537 | ret = -EFAULT; | |
538 | goto out; | |
539 | } | |
540 | ||
541 | bp = tsk->thread.debug.hbp[idx]; | |
542 | if (!bp) { | |
543 | bp = ptrace_hbp_create(tsk, implied_type); | |
544 | if (IS_ERR(bp)) { | |
545 | ret = PTR_ERR(bp); | |
546 | goto out; | |
547 | } | |
548 | tsk->thread.debug.hbp[idx] = bp; | |
549 | } | |
550 | ||
551 | attr = bp->attr; | |
552 | ||
553 | if (num & 0x1) { | |
554 | /* Address */ | |
555 | attr.bp_addr = user_val; | |
556 | } else { | |
557 | /* Control */ | |
558 | decode_ctrl_reg(user_val, &ctrl); | |
559 | ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type); | |
560 | if (ret) | |
561 | goto out; | |
562 | ||
563 | if ((gen_type & implied_type) != gen_type) { | |
ce9b1b09 WD |
564 | ret = -EINVAL; |
565 | goto out; | |
864232fa WD |
566 | } |
567 | ||
568 | attr.bp_len = gen_len; | |
569 | attr.bp_type = gen_type; | |
570 | attr.disabled = !ctrl.enabled; | |
571 | } | |
572 | ||
573 | ret = modify_user_hw_breakpoint(bp, &attr); | |
574 | out: | |
575 | return ret; | |
576 | } | |
577 | #endif | |
578 | ||
5be6f62b DM |
579 | /* regset get/set implementations */ |
580 | ||
581 | static int gpr_get(struct task_struct *target, | |
582 | const struct user_regset *regset, | |
583 | unsigned int pos, unsigned int count, | |
584 | void *kbuf, void __user *ubuf) | |
585 | { | |
586 | struct pt_regs *regs = task_pt_regs(target); | |
587 | ||
588 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
589 | regs, | |
590 | 0, sizeof(*regs)); | |
591 | } | |
592 | ||
593 | static int gpr_set(struct task_struct *target, | |
594 | const struct user_regset *regset, | |
595 | unsigned int pos, unsigned int count, | |
596 | const void *kbuf, const void __user *ubuf) | |
597 | { | |
598 | int ret; | |
599 | struct pt_regs newregs; | |
600 | ||
601 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
602 | &newregs, | |
603 | 0, sizeof(newregs)); | |
604 | if (ret) | |
605 | return ret; | |
606 | ||
607 | if (!valid_user_regs(&newregs)) | |
608 | return -EINVAL; | |
609 | ||
610 | *task_pt_regs(target) = newregs; | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static int fpa_get(struct task_struct *target, | |
615 | const struct user_regset *regset, | |
616 | unsigned int pos, unsigned int count, | |
617 | void *kbuf, void __user *ubuf) | |
618 | { | |
619 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
620 | &task_thread_info(target)->fpstate, | |
621 | 0, sizeof(struct user_fp)); | |
622 | } | |
623 | ||
624 | static int fpa_set(struct task_struct *target, | |
625 | const struct user_regset *regset, | |
626 | unsigned int pos, unsigned int count, | |
627 | const void *kbuf, const void __user *ubuf) | |
628 | { | |
629 | struct thread_info *thread = task_thread_info(target); | |
630 | ||
631 | thread->used_cp[1] = thread->used_cp[2] = 1; | |
632 | ||
633 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
634 | &thread->fpstate, | |
635 | 0, sizeof(struct user_fp)); | |
636 | } | |
637 | ||
638 | #ifdef CONFIG_VFP | |
639 | /* | |
640 | * VFP register get/set implementations. | |
641 | * | |
642 | * With respect to the kernel, struct user_fp is divided into three chunks: | |
643 | * 16 or 32 real VFP registers (d0-d15 or d0-31) | |
644 | * These are transferred to/from the real registers in the task's | |
645 | * vfp_hard_struct. The number of registers depends on the kernel | |
646 | * configuration. | |
647 | * | |
648 | * 16 or 0 fake VFP registers (d16-d31 or empty) | |
649 | * i.e., the user_vfp structure has space for 32 registers even if | |
650 | * the kernel doesn't have them all. | |
651 | * | |
652 | * vfp_get() reads this chunk as zero where applicable | |
653 | * vfp_set() ignores this chunk | |
654 | * | |
655 | * 1 word for the FPSCR | |
656 | * | |
657 | * The bounds-checking logic built into user_regset_copyout and friends | |
658 | * means that we can make a simple sequence of calls to map the relevant data | |
659 | * to/from the specified slice of the user regset structure. | |
660 | */ | |
661 | static int vfp_get(struct task_struct *target, | |
662 | const struct user_regset *regset, | |
663 | unsigned int pos, unsigned int count, | |
664 | void *kbuf, void __user *ubuf) | |
665 | { | |
666 | int ret; | |
667 | struct thread_info *thread = task_thread_info(target); | |
668 | struct vfp_hard_struct const *vfp = &thread->vfpstate.hard; | |
669 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); | |
670 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); | |
671 | ||
672 | vfp_sync_hwstate(thread); | |
673 | ||
674 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
675 | &vfp->fpregs, | |
676 | user_fpregs_offset, | |
677 | user_fpregs_offset + sizeof(vfp->fpregs)); | |
678 | if (ret) | |
679 | return ret; | |
680 | ||
681 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
682 | user_fpregs_offset + sizeof(vfp->fpregs), | |
683 | user_fpscr_offset); | |
684 | if (ret) | |
685 | return ret; | |
686 | ||
687 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
688 | &vfp->fpscr, | |
689 | user_fpscr_offset, | |
690 | user_fpscr_offset + sizeof(vfp->fpscr)); | |
691 | } | |
692 | ||
693 | /* | |
694 | * For vfp_set() a read-modify-write is done on the VFP registers, | |
695 | * in order to avoid writing back a half-modified set of registers on | |
696 | * failure. | |
697 | */ | |
698 | static int vfp_set(struct task_struct *target, | |
699 | const struct user_regset *regset, | |
700 | unsigned int pos, unsigned int count, | |
701 | const void *kbuf, const void __user *ubuf) | |
702 | { | |
703 | int ret; | |
704 | struct thread_info *thread = task_thread_info(target); | |
247f4993 | 705 | struct vfp_hard_struct new_vfp; |
5be6f62b DM |
706 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); |
707 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); | |
708 | ||
247f4993 DM |
709 | vfp_sync_hwstate(thread); |
710 | new_vfp = thread->vfpstate.hard; | |
711 | ||
5be6f62b DM |
712 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
713 | &new_vfp.fpregs, | |
714 | user_fpregs_offset, | |
715 | user_fpregs_offset + sizeof(new_vfp.fpregs)); | |
716 | if (ret) | |
717 | return ret; | |
718 | ||
719 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
720 | user_fpregs_offset + sizeof(new_vfp.fpregs), | |
721 | user_fpscr_offset); | |
722 | if (ret) | |
723 | return ret; | |
724 | ||
725 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
726 | &new_vfp.fpscr, | |
727 | user_fpscr_offset, | |
728 | user_fpscr_offset + sizeof(new_vfp.fpscr)); | |
729 | if (ret) | |
730 | return ret; | |
731 | ||
5be6f62b | 732 | vfp_flush_hwstate(thread); |
8130b9d7 | 733 | thread->vfpstate.hard = new_vfp; |
5be6f62b DM |
734 | |
735 | return 0; | |
736 | } | |
737 | #endif /* CONFIG_VFP */ | |
738 | ||
739 | enum arm_regset { | |
740 | REGSET_GPR, | |
741 | REGSET_FPR, | |
742 | #ifdef CONFIG_VFP | |
743 | REGSET_VFP, | |
744 | #endif | |
745 | }; | |
746 | ||
747 | static const struct user_regset arm_regsets[] = { | |
748 | [REGSET_GPR] = { | |
749 | .core_note_type = NT_PRSTATUS, | |
750 | .n = ELF_NGREG, | |
751 | .size = sizeof(u32), | |
752 | .align = sizeof(u32), | |
753 | .get = gpr_get, | |
754 | .set = gpr_set | |
755 | }, | |
756 | [REGSET_FPR] = { | |
757 | /* | |
758 | * For the FPA regs in fpstate, the real fields are a mixture | |
759 | * of sizes, so pretend that the registers are word-sized: | |
760 | */ | |
761 | .core_note_type = NT_PRFPREG, | |
762 | .n = sizeof(struct user_fp) / sizeof(u32), | |
763 | .size = sizeof(u32), | |
764 | .align = sizeof(u32), | |
765 | .get = fpa_get, | |
766 | .set = fpa_set | |
767 | }, | |
768 | #ifdef CONFIG_VFP | |
769 | [REGSET_VFP] = { | |
770 | /* | |
771 | * Pretend that the VFP regs are word-sized, since the FPSCR is | |
772 | * a single word dangling at the end of struct user_vfp: | |
773 | */ | |
774 | .core_note_type = NT_ARM_VFP, | |
775 | .n = ARM_VFPREGS_SIZE / sizeof(u32), | |
776 | .size = sizeof(u32), | |
777 | .align = sizeof(u32), | |
778 | .get = vfp_get, | |
779 | .set = vfp_set | |
780 | }, | |
781 | #endif /* CONFIG_VFP */ | |
782 | }; | |
783 | ||
784 | static const struct user_regset_view user_arm_view = { | |
785 | .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, | |
786 | .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets) | |
787 | }; | |
788 | ||
789 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
790 | { | |
791 | return &user_arm_view; | |
792 | } | |
793 | ||
9b05a69e NK |
794 | long arch_ptrace(struct task_struct *child, long request, |
795 | unsigned long addr, unsigned long data) | |
1da177e4 | 796 | { |
1da177e4 | 797 | int ret; |
b640a0d1 | 798 | unsigned long __user *datap = (unsigned long __user *) data; |
1da177e4 LT |
799 | |
800 | switch (request) { | |
1da177e4 | 801 | case PTRACE_PEEKUSR: |
b640a0d1 | 802 | ret = ptrace_read_user(child, addr, datap); |
1da177e4 LT |
803 | break; |
804 | ||
1da177e4 LT |
805 | case PTRACE_POKEUSR: |
806 | ret = ptrace_write_user(child, addr, data); | |
807 | break; | |
808 | ||
1da177e4 | 809 | case PTRACE_GETREGS: |
5be6f62b DM |
810 | ret = copy_regset_to_user(child, |
811 | &user_arm_view, REGSET_GPR, | |
812 | 0, sizeof(struct pt_regs), | |
813 | datap); | |
1da177e4 LT |
814 | break; |
815 | ||
816 | case PTRACE_SETREGS: | |
5be6f62b DM |
817 | ret = copy_regset_from_user(child, |
818 | &user_arm_view, REGSET_GPR, | |
819 | 0, sizeof(struct pt_regs), | |
820 | datap); | |
1da177e4 LT |
821 | break; |
822 | ||
823 | case PTRACE_GETFPREGS: | |
5be6f62b DM |
824 | ret = copy_regset_to_user(child, |
825 | &user_arm_view, REGSET_FPR, | |
826 | 0, sizeof(union fp_state), | |
827 | datap); | |
1da177e4 | 828 | break; |
5be6f62b | 829 | |
1da177e4 | 830 | case PTRACE_SETFPREGS: |
5be6f62b DM |
831 | ret = copy_regset_from_user(child, |
832 | &user_arm_view, REGSET_FPR, | |
833 | 0, sizeof(union fp_state), | |
834 | datap); | |
1da177e4 LT |
835 | break; |
836 | ||
837 | #ifdef CONFIG_IWMMXT | |
838 | case PTRACE_GETWMMXREGS: | |
b640a0d1 | 839 | ret = ptrace_getwmmxregs(child, datap); |
1da177e4 LT |
840 | break; |
841 | ||
842 | case PTRACE_SETWMMXREGS: | |
b640a0d1 | 843 | ret = ptrace_setwmmxregs(child, datap); |
1da177e4 LT |
844 | break; |
845 | #endif | |
846 | ||
847 | case PTRACE_GET_THREAD_AREA: | |
e7c1b32f | 848 | ret = put_user(task_thread_info(child)->tp_value, |
b640a0d1 | 849 | datap); |
1da177e4 LT |
850 | break; |
851 | ||
3f471126 | 852 | case PTRACE_SET_SYSCALL: |
5ba6d3fe | 853 | task_thread_info(child)->syscall = data; |
3f471126 | 854 | ret = 0; |
3f471126 NP |
855 | break; |
856 | ||
5429b060 LB |
857 | #ifdef CONFIG_CRUNCH |
858 | case PTRACE_GETCRUNCHREGS: | |
b640a0d1 | 859 | ret = ptrace_getcrunchregs(child, datap); |
5429b060 LB |
860 | break; |
861 | ||
862 | case PTRACE_SETCRUNCHREGS: | |
b640a0d1 | 863 | ret = ptrace_setcrunchregs(child, datap); |
5429b060 LB |
864 | break; |
865 | #endif | |
866 | ||
3d1228ea CM |
867 | #ifdef CONFIG_VFP |
868 | case PTRACE_GETVFPREGS: | |
5be6f62b DM |
869 | ret = copy_regset_to_user(child, |
870 | &user_arm_view, REGSET_VFP, | |
871 | 0, ARM_VFPREGS_SIZE, | |
872 | datap); | |
3d1228ea CM |
873 | break; |
874 | ||
875 | case PTRACE_SETVFPREGS: | |
5be6f62b DM |
876 | ret = copy_regset_from_user(child, |
877 | &user_arm_view, REGSET_VFP, | |
878 | 0, ARM_VFPREGS_SIZE, | |
879 | datap); | |
3d1228ea CM |
880 | break; |
881 | #endif | |
882 | ||
864232fa WD |
883 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
884 | case PTRACE_GETHBPREGS: | |
bf0b8f4b FW |
885 | if (ptrace_get_breakpoints(child) < 0) |
886 | return -ESRCH; | |
887 | ||
864232fa WD |
888 | ret = ptrace_gethbpregs(child, addr, |
889 | (unsigned long __user *)data); | |
bf0b8f4b | 890 | ptrace_put_breakpoints(child); |
864232fa WD |
891 | break; |
892 | case PTRACE_SETHBPREGS: | |
bf0b8f4b FW |
893 | if (ptrace_get_breakpoints(child) < 0) |
894 | return -ESRCH; | |
895 | ||
864232fa WD |
896 | ret = ptrace_sethbpregs(child, addr, |
897 | (unsigned long __user *)data); | |
bf0b8f4b | 898 | ptrace_put_breakpoints(child); |
864232fa WD |
899 | break; |
900 | #endif | |
901 | ||
1da177e4 LT |
902 | default: |
903 | ret = ptrace_request(child, request, addr, data); | |
904 | break; | |
905 | } | |
906 | ||
907 | return ret; | |
908 | } | |
909 | ||
3f471126 | 910 | asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno) |
1da177e4 LT |
911 | { |
912 | unsigned long ip; | |
913 | ||
29ef73b7 | 914 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
5125430c | 915 | goto out_no_trace; |
29ef73b7 | 916 | |
5ba6d3fe | 917 | current_thread_info()->syscall = scno; |
3f471126 | 918 | |
6a68b6f5 WD |
919 | /* |
920 | * IP is used to denote syscall entry/exit: | |
921 | * IP = 0 -> entry, =1 -> exit | |
922 | */ | |
923 | ip = regs->ARM_ip; | |
924 | regs->ARM_ip = why; | |
925 | ||
0693bf68 WF |
926 | if (why) |
927 | tracehook_report_syscall_exit(regs, 0); | |
928 | else if (tracehook_report_syscall_entry(regs)) | |
929 | current_thread_info()->syscall = -1; | |
930 | ||
1da177e4 | 931 | regs->ARM_ip = ip; |
5125430c | 932 | scno = current_thread_info()->syscall; |
3f471126 | 933 | |
5125430c WD |
934 | out_no_trace: |
935 | if (why) | |
936 | audit_syscall_exit(regs); | |
937 | else | |
938 | audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0, | |
939 | regs->ARM_r1, regs->ARM_r2, regs->ARM_r3); | |
940 | return scno; | |
1da177e4 | 941 | } |