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1/*
2 * Ptrace user space interface.
3 *
4 * Copyright IBM Corp. 1999,2010
5 * Author(s): Denis Joseph Barrow
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/errno.h>
14#include <linux/ptrace.h>
15#include <linux/user.h>
16#include <linux/security.h>
17#include <linux/audit.h>
18#include <linux/signal.h>
19#include <linux/elf.h>
20#include <linux/regset.h>
21#include <linux/tracehook.h>
22#include <linux/seccomp.h>
23#include <trace/syscall.h>
24#include <asm/compat.h>
25#include <asm/segment.h>
26#include <asm/page.h>
27#include <asm/pgtable.h>
28#include <asm/pgalloc.h>
29#include <asm/system.h>
30#include <asm/uaccess.h>
31#include <asm/unistd.h>
32#include "entry.h"
33
34#ifdef CONFIG_COMPAT
35#include "compat_ptrace.h"
36#endif
37
38#define CREATE_TRACE_POINTS
39#include <trace/events/syscalls.h>
40
41enum s390_regset {
42 REGSET_GENERAL,
43 REGSET_FP,
44 REGSET_LAST_BREAK,
45 REGSET_GENERAL_EXTENDED,
46};
47
48void update_per_regs(struct task_struct *task)
49{
50 static const struct per_regs per_single_step = {
51 .control = PER_EVENT_IFETCH,
52 .start = 0,
53 .end = PSW_ADDR_INSN,
54 };
55 struct pt_regs *regs = task_pt_regs(task);
56 struct thread_struct *thread = &task->thread;
57 const struct per_regs *new;
58 struct per_regs old;
59
60 /* TIF_SINGLE_STEP overrides the user specified PER registers. */
61 new = test_tsk_thread_flag(task, TIF_SINGLE_STEP) ?
62 &per_single_step : &thread->per_user;
63
64 /* Take care of the PER enablement bit in the PSW. */
65 if (!(new->control & PER_EVENT_MASK)) {
66 regs->psw.mask &= ~PSW_MASK_PER;
67 return;
68 }
69 regs->psw.mask |= PSW_MASK_PER;
70 __ctl_store(old, 9, 11);
71 if (memcmp(new, &old, sizeof(struct per_regs)) != 0)
72 __ctl_load(*new, 9, 11);
73}
74
75void user_enable_single_step(struct task_struct *task)
76{
77 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
78 if (task == current)
79 update_per_regs(task);
80}
81
82void user_disable_single_step(struct task_struct *task)
83{
84 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
85 if (task == current)
86 update_per_regs(task);
87}
88
89/*
90 * Called by kernel/ptrace.c when detaching..
91 *
92 * Clear all debugging related fields.
93 */
94void ptrace_disable(struct task_struct *task)
95{
96 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
97 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
98 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
99 clear_tsk_thread_flag(task, TIF_PER_TRAP);
100}
101
102#ifndef CONFIG_64BIT
103# define __ADDR_MASK 3
104#else
105# define __ADDR_MASK 7
106#endif
107
108static inline unsigned long __peek_user_per(struct task_struct *child,
109 addr_t addr)
110{
111 struct per_struct_kernel *dummy = NULL;
112
113 if (addr == (addr_t) &dummy->cr9)
114 /* Control bits of the active per set. */
115 return test_thread_flag(TIF_SINGLE_STEP) ?
116 PER_EVENT_IFETCH : child->thread.per_user.control;
117 else if (addr == (addr_t) &dummy->cr10)
118 /* Start address of the active per set. */
119 return test_thread_flag(TIF_SINGLE_STEP) ?
120 0 : child->thread.per_user.start;
121 else if (addr == (addr_t) &dummy->cr11)
122 /* End address of the active per set. */
123 return test_thread_flag(TIF_SINGLE_STEP) ?
124 PSW_ADDR_INSN : child->thread.per_user.end;
125 else if (addr == (addr_t) &dummy->bits)
126 /* Single-step bit. */
127 return test_thread_flag(TIF_SINGLE_STEP) ?
128 (1UL << (BITS_PER_LONG - 1)) : 0;
129 else if (addr == (addr_t) &dummy->starting_addr)
130 /* Start address of the user specified per set. */
131 return child->thread.per_user.start;
132 else if (addr == (addr_t) &dummy->ending_addr)
133 /* End address of the user specified per set. */
134 return child->thread.per_user.end;
135 else if (addr == (addr_t) &dummy->perc_atmid)
136 /* PER code, ATMID and AI of the last PER trap */
137 return (unsigned long)
138 child->thread.per_event.cause << (BITS_PER_LONG - 16);
139 else if (addr == (addr_t) &dummy->address)
140 /* Address of the last PER trap */
141 return child->thread.per_event.address;
142 else if (addr == (addr_t) &dummy->access_id)
143 /* Access id of the last PER trap */
144 return (unsigned long)
145 child->thread.per_event.paid << (BITS_PER_LONG - 8);
146 return 0;
147}
148
149/*
150 * Read the word at offset addr from the user area of a process. The
151 * trouble here is that the information is littered over different
152 * locations. The process registers are found on the kernel stack,
153 * the floating point stuff and the trace settings are stored in
154 * the task structure. In addition the different structures in
155 * struct user contain pad bytes that should be read as zeroes.
156 * Lovely...
157 */
158static unsigned long __peek_user(struct task_struct *child, addr_t addr)
159{
160 struct user *dummy = NULL;
161 addr_t offset, tmp;
162
163 if (addr < (addr_t) &dummy->regs.acrs) {
164 /*
165 * psw and gprs are stored on the stack
166 */
167 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
168 if (addr == (addr_t) &dummy->regs.psw.mask)
169 /* Remove per bit from user psw. */
170 tmp &= ~PSW_MASK_PER;
171
172 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
173 /*
174 * access registers are stored in the thread structure
175 */
176 offset = addr - (addr_t) &dummy->regs.acrs;
177#ifdef CONFIG_64BIT
178 /*
179 * Very special case: old & broken 64 bit gdb reading
180 * from acrs[15]. Result is a 64 bit value. Read the
181 * 32 bit acrs[15] value and shift it by 32. Sick...
182 */
183 if (addr == (addr_t) &dummy->regs.acrs[15])
184 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
185 else
186#endif
187 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
188
189 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
190 /*
191 * orig_gpr2 is stored on the kernel stack
192 */
193 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
194
195 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
196 /*
197 * prevent reads of padding hole between
198 * orig_gpr2 and fp_regs on s390.
199 */
200 tmp = 0;
201
202 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
203 /*
204 * floating point regs. are stored in the thread structure
205 */
206 offset = addr - (addr_t) &dummy->regs.fp_regs;
207 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
208 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
209 tmp &= (unsigned long) FPC_VALID_MASK
210 << (BITS_PER_LONG - 32);
211
212 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
213 /*
214 * Handle access to the per_info structure.
215 */
216 addr -= (addr_t) &dummy->regs.per_info;
217 tmp = __peek_user_per(child, addr);
218
219 } else
220 tmp = 0;
221
222 return tmp;
223}
224
225static int
226peek_user(struct task_struct *child, addr_t addr, addr_t data)
227{
228 addr_t tmp, mask;
229
230 /*
231 * Stupid gdb peeks/pokes the access registers in 64 bit with
232 * an alignment of 4. Programmers from hell...
233 */
234 mask = __ADDR_MASK;
235#ifdef CONFIG_64BIT
236 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
237 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
238 mask = 3;
239#endif
240 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
241 return -EIO;
242
243 tmp = __peek_user(child, addr);
244 return put_user(tmp, (addr_t __user *) data);
245}
246
247static inline void __poke_user_per(struct task_struct *child,
248 addr_t addr, addr_t data)
249{
250 struct per_struct_kernel *dummy = NULL;
251
252 /*
253 * There are only three fields in the per_info struct that the
254 * debugger user can write to.
255 * 1) cr9: the debugger wants to set a new PER event mask
256 * 2) starting_addr: the debugger wants to set a new starting
257 * address to use with the PER event mask.
258 * 3) ending_addr: the debugger wants to set a new ending
259 * address to use with the PER event mask.
260 * The user specified PER event mask and the start and end
261 * addresses are used only if single stepping is not in effect.
262 * Writes to any other field in per_info are ignored.
263 */
264 if (addr == (addr_t) &dummy->cr9)
265 /* PER event mask of the user specified per set. */
266 child->thread.per_user.control =
267 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
268 else if (addr == (addr_t) &dummy->starting_addr)
269 /* Starting address of the user specified per set. */
270 child->thread.per_user.start = data;
271 else if (addr == (addr_t) &dummy->ending_addr)
272 /* Ending address of the user specified per set. */
273 child->thread.per_user.end = data;
274}
275
276/*
277 * Write a word to the user area of a process at location addr. This
278 * operation does have an additional problem compared to peek_user.
279 * Stores to the program status word and on the floating point
280 * control register needs to get checked for validity.
281 */
282static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
283{
284 struct user *dummy = NULL;
285 addr_t offset;
286
287 if (addr < (addr_t) &dummy->regs.acrs) {
288 /*
289 * psw and gprs are stored on the stack
290 */
291 if (addr == (addr_t) &dummy->regs.psw.mask &&
292#ifdef CONFIG_COMPAT
293 data != PSW_MASK_MERGE(psw_user32_bits, data) &&
294#endif
295 data != PSW_MASK_MERGE(psw_user_bits, data))
296 /* Invalid psw mask. */
297 return -EINVAL;
298#ifndef CONFIG_64BIT
299 if (addr == (addr_t) &dummy->regs.psw.addr)
300 /* I'd like to reject addresses without the
301 high order bit but older gdb's rely on it */
302 data |= PSW_ADDR_AMODE;
303#endif
304 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
305
306 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
307 /*
308 * access registers are stored in the thread structure
309 */
310 offset = addr - (addr_t) &dummy->regs.acrs;
311#ifdef CONFIG_64BIT
312 /*
313 * Very special case: old & broken 64 bit gdb writing
314 * to acrs[15] with a 64 bit value. Ignore the lower
315 * half of the value and write the upper 32 bit to
316 * acrs[15]. Sick...
317 */
318 if (addr == (addr_t) &dummy->regs.acrs[15])
319 child->thread.acrs[15] = (unsigned int) (data >> 32);
320 else
321#endif
322 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
323
324 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
325 /*
326 * orig_gpr2 is stored on the kernel stack
327 */
328 task_pt_regs(child)->orig_gpr2 = data;
329
330 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
331 /*
332 * prevent writes of padding hole between
333 * orig_gpr2 and fp_regs on s390.
334 */
335 return 0;
336
337 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
338 /*
339 * floating point regs. are stored in the thread structure
340 */
341 if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
342 (data & ~((unsigned long) FPC_VALID_MASK
343 << (BITS_PER_LONG - 32))) != 0)
344 return -EINVAL;
345 offset = addr - (addr_t) &dummy->regs.fp_regs;
346 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
347
348 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
349 /*
350 * Handle access to the per_info structure.
351 */
352 addr -= (addr_t) &dummy->regs.per_info;
353 __poke_user_per(child, addr, data);
354
355 }
356
357 return 0;
358}
359
360static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
361{
362 addr_t mask;
363
364 /*
365 * Stupid gdb peeks/pokes the access registers in 64 bit with
366 * an alignment of 4. Programmers from hell indeed...
367 */
368 mask = __ADDR_MASK;
369#ifdef CONFIG_64BIT
370 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
371 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
372 mask = 3;
373#endif
374 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
375 return -EIO;
376
377 return __poke_user(child, addr, data);
378}
379
380long arch_ptrace(struct task_struct *child, long request,
381 unsigned long addr, unsigned long data)
382{
383 ptrace_area parea;
384 int copied, ret;
385
386 switch (request) {
387 case PTRACE_PEEKUSR:
388 /* read the word at location addr in the USER area. */
389 return peek_user(child, addr, data);
390
391 case PTRACE_POKEUSR:
392 /* write the word at location addr in the USER area */
393 return poke_user(child, addr, data);
394
395 case PTRACE_PEEKUSR_AREA:
396 case PTRACE_POKEUSR_AREA:
397 if (copy_from_user(&parea, (void __force __user *) addr,
398 sizeof(parea)))
399 return -EFAULT;
400 addr = parea.kernel_addr;
401 data = parea.process_addr;
402 copied = 0;
403 while (copied < parea.len) {
404 if (request == PTRACE_PEEKUSR_AREA)
405 ret = peek_user(child, addr, data);
406 else {
407 addr_t utmp;
408 if (get_user(utmp,
409 (addr_t __force __user *) data))
410 return -EFAULT;
411 ret = poke_user(child, addr, utmp);
412 }
413 if (ret)
414 return ret;
415 addr += sizeof(unsigned long);
416 data += sizeof(unsigned long);
417 copied += sizeof(unsigned long);
418 }
419 return 0;
420 case PTRACE_GET_LAST_BREAK:
421 put_user(task_thread_info(child)->last_break,
422 (unsigned long __user *) data);
423 return 0;
424 default:
425 /* Removing high order bit from addr (only for 31 bit). */
426 addr &= PSW_ADDR_INSN;
427 return ptrace_request(child, request, addr, data);
428 }
429}
430
431#ifdef CONFIG_COMPAT
432/*
433 * Now the fun part starts... a 31 bit program running in the
434 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
435 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
436 * to handle, the difference to the 64 bit versions of the requests
437 * is that the access is done in multiples of 4 byte instead of
438 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
439 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
440 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
441 * is a 31 bit program too, the content of struct user can be
442 * emulated. A 31 bit program peeking into the struct user of
443 * a 64 bit program is a no-no.
444 */
445
446/*
447 * Same as peek_user_per but for a 31 bit program.
448 */
449static inline __u32 __peek_user_per_compat(struct task_struct *child,
450 addr_t addr)
451{
452 struct compat_per_struct_kernel *dummy32 = NULL;
453
454 if (addr == (addr_t) &dummy32->cr9)
455 /* Control bits of the active per set. */
456 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
457 PER_EVENT_IFETCH : child->thread.per_user.control;
458 else if (addr == (addr_t) &dummy32->cr10)
459 /* Start address of the active per set. */
460 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
461 0 : child->thread.per_user.start;
462 else if (addr == (addr_t) &dummy32->cr11)
463 /* End address of the active per set. */
464 return test_thread_flag(TIF_SINGLE_STEP) ?
465 PSW32_ADDR_INSN : child->thread.per_user.end;
466 else if (addr == (addr_t) &dummy32->bits)
467 /* Single-step bit. */
468 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
469 0x80000000 : 0;
470 else if (addr == (addr_t) &dummy32->starting_addr)
471 /* Start address of the user specified per set. */
472 return (__u32) child->thread.per_user.start;
473 else if (addr == (addr_t) &dummy32->ending_addr)
474 /* End address of the user specified per set. */
475 return (__u32) child->thread.per_user.end;
476 else if (addr == (addr_t) &dummy32->perc_atmid)
477 /* PER code, ATMID and AI of the last PER trap */
478 return (__u32) child->thread.per_event.cause << 16;
479 else if (addr == (addr_t) &dummy32->address)
480 /* Address of the last PER trap */
481 return (__u32) child->thread.per_event.address;
482 else if (addr == (addr_t) &dummy32->access_id)
483 /* Access id of the last PER trap */
484 return (__u32) child->thread.per_event.paid << 24;
485 return 0;
486}
487
488/*
489 * Same as peek_user but for a 31 bit program.
490 */
491static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
492{
493 struct compat_user *dummy32 = NULL;
494 addr_t offset;
495 __u32 tmp;
496
497 if (addr < (addr_t) &dummy32->regs.acrs) {
498 /*
499 * psw and gprs are stored on the stack
500 */
501 if (addr == (addr_t) &dummy32->regs.psw.mask) {
502 /* Fake a 31 bit psw mask. */
503 tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32);
504 tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp);
505 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
506 /* Fake a 31 bit psw address. */
507 tmp = (__u32) task_pt_regs(child)->psw.addr |
508 PSW32_ADDR_AMODE31;
509 } else {
510 /* gpr 0-15 */
511 tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw +
512 addr*2 + 4);
513 }
514 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
515 /*
516 * access registers are stored in the thread structure
517 */
518 offset = addr - (addr_t) &dummy32->regs.acrs;
519 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
520
521 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
522 /*
523 * orig_gpr2 is stored on the kernel stack
524 */
525 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
526
527 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
528 /*
529 * prevent reads of padding hole between
530 * orig_gpr2 and fp_regs on s390.
531 */
532 tmp = 0;
533
534 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
535 /*
536 * floating point regs. are stored in the thread structure
537 */
538 offset = addr - (addr_t) &dummy32->regs.fp_regs;
539 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
540
541 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
542 /*
543 * Handle access to the per_info structure.
544 */
545 addr -= (addr_t) &dummy32->regs.per_info;
546 tmp = __peek_user_per_compat(child, addr);
547
548 } else
549 tmp = 0;
550
551 return tmp;
552}
553
554static int peek_user_compat(struct task_struct *child,
555 addr_t addr, addr_t data)
556{
557 __u32 tmp;
558
559 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
560 return -EIO;
561
562 tmp = __peek_user_compat(child, addr);
563 return put_user(tmp, (__u32 __user *) data);
564}
565
566/*
567 * Same as poke_user_per but for a 31 bit program.
568 */
569static inline void __poke_user_per_compat(struct task_struct *child,
570 addr_t addr, __u32 data)
571{
572 struct compat_per_struct_kernel *dummy32 = NULL;
573
574 if (addr == (addr_t) &dummy32->cr9)
575 /* PER event mask of the user specified per set. */
576 child->thread.per_user.control =
577 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
578 else if (addr == (addr_t) &dummy32->starting_addr)
579 /* Starting address of the user specified per set. */
580 child->thread.per_user.start = data;
581 else if (addr == (addr_t) &dummy32->ending_addr)
582 /* Ending address of the user specified per set. */
583 child->thread.per_user.end = data;
584}
585
586/*
587 * Same as poke_user but for a 31 bit program.
588 */
589static int __poke_user_compat(struct task_struct *child,
590 addr_t addr, addr_t data)
591{
592 struct compat_user *dummy32 = NULL;
593 __u32 tmp = (__u32) data;
594 addr_t offset;
595
596 if (addr < (addr_t) &dummy32->regs.acrs) {
597 /*
598 * psw, gprs, acrs and orig_gpr2 are stored on the stack
599 */
600 if (addr == (addr_t) &dummy32->regs.psw.mask) {
601 /* Build a 64 bit psw mask from 31 bit mask. */
602 if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp))
603 /* Invalid psw mask. */
604 return -EINVAL;
605 task_pt_regs(child)->psw.mask =
606 PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32);
607 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
608 /* Build a 64 bit psw address from 31 bit address. */
609 task_pt_regs(child)->psw.addr =
610 (__u64) tmp & PSW32_ADDR_INSN;
611 } else {
612 /* gpr 0-15 */
613 *(__u32*)((addr_t) &task_pt_regs(child)->psw
614 + addr*2 + 4) = tmp;
615 }
616 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
617 /*
618 * access registers are stored in the thread structure
619 */
620 offset = addr - (addr_t) &dummy32->regs.acrs;
621 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
622
623 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
624 /*
625 * orig_gpr2 is stored on the kernel stack
626 */
627 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
628
629 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
630 /*
631 * prevent writess of padding hole between
632 * orig_gpr2 and fp_regs on s390.
633 */
634 return 0;
635
636 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
637 /*
638 * floating point regs. are stored in the thread structure
639 */
640 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
641 (tmp & ~FPC_VALID_MASK) != 0)
642 /* Invalid floating point control. */
643 return -EINVAL;
644 offset = addr - (addr_t) &dummy32->regs.fp_regs;
645 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
646
647 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
648 /*
649 * Handle access to the per_info structure.
650 */
651 addr -= (addr_t) &dummy32->regs.per_info;
652 __poke_user_per_compat(child, addr, data);
653 }
654
655 return 0;
656}
657
658static int poke_user_compat(struct task_struct *child,
659 addr_t addr, addr_t data)
660{
661 if (!is_compat_task() || (addr & 3) ||
662 addr > sizeof(struct compat_user) - 3)
663 return -EIO;
664
665 return __poke_user_compat(child, addr, data);
666}
667
668long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
669 compat_ulong_t caddr, compat_ulong_t cdata)
670{
671 unsigned long addr = caddr;
672 unsigned long data = cdata;
673 compat_ptrace_area parea;
674 int copied, ret;
675
676 switch (request) {
677 case PTRACE_PEEKUSR:
678 /* read the word at location addr in the USER area. */
679 return peek_user_compat(child, addr, data);
680
681 case PTRACE_POKEUSR:
682 /* write the word at location addr in the USER area */
683 return poke_user_compat(child, addr, data);
684
685 case PTRACE_PEEKUSR_AREA:
686 case PTRACE_POKEUSR_AREA:
687 if (copy_from_user(&parea, (void __force __user *) addr,
688 sizeof(parea)))
689 return -EFAULT;
690 addr = parea.kernel_addr;
691 data = parea.process_addr;
692 copied = 0;
693 while (copied < parea.len) {
694 if (request == PTRACE_PEEKUSR_AREA)
695 ret = peek_user_compat(child, addr, data);
696 else {
697 __u32 utmp;
698 if (get_user(utmp,
699 (__u32 __force __user *) data))
700 return -EFAULT;
701 ret = poke_user_compat(child, addr, utmp);
702 }
703 if (ret)
704 return ret;
705 addr += sizeof(unsigned int);
706 data += sizeof(unsigned int);
707 copied += sizeof(unsigned int);
708 }
709 return 0;
710 case PTRACE_GET_LAST_BREAK:
711 put_user(task_thread_info(child)->last_break,
712 (unsigned int __user *) data);
713 return 0;
714 }
715 return compat_ptrace_request(child, request, addr, data);
716}
717#endif
718
719asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
720{
721 long ret = 0;
722
723 /* Do the secure computing check first. */
724 secure_computing(regs->gprs[2]);
725
726 /*
727 * The sysc_tracesys code in entry.S stored the system
728 * call number to gprs[2].
729 */
730 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
731 (tracehook_report_syscall_entry(regs) ||
732 regs->gprs[2] >= NR_syscalls)) {
733 /*
734 * Tracing decided this syscall should not happen or the
735 * debugger stored an invalid system call number. Skip
736 * the system call and the system call restart handling.
737 */
738 regs->svcnr = 0;
739 ret = -1;
740 }
741
742 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
743 trace_sys_enter(regs, regs->gprs[2]);
744
745 if (unlikely(current->audit_context))
746 audit_syscall_entry(is_compat_task() ?
747 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
748 regs->gprs[2], regs->orig_gpr2,
749 regs->gprs[3], regs->gprs[4],
750 regs->gprs[5]);
751 return ret ?: regs->gprs[2];
752}
753
754asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
755{
756 if (unlikely(current->audit_context))
757 audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
758 regs->gprs[2]);
759
760 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
761 trace_sys_exit(regs, regs->gprs[2]);
762
763 if (test_thread_flag(TIF_SYSCALL_TRACE))
764 tracehook_report_syscall_exit(regs, 0);
765}
766
767/*
768 * user_regset definitions.
769 */
770
771static int s390_regs_get(struct task_struct *target,
772 const struct user_regset *regset,
773 unsigned int pos, unsigned int count,
774 void *kbuf, void __user *ubuf)
775{
776 if (target == current)
777 save_access_regs(target->thread.acrs);
778
779 if (kbuf) {
780 unsigned long *k = kbuf;
781 while (count > 0) {
782 *k++ = __peek_user(target, pos);
783 count -= sizeof(*k);
784 pos += sizeof(*k);
785 }
786 } else {
787 unsigned long __user *u = ubuf;
788 while (count > 0) {
789 if (__put_user(__peek_user(target, pos), u++))
790 return -EFAULT;
791 count -= sizeof(*u);
792 pos += sizeof(*u);
793 }
794 }
795 return 0;
796}
797
798static int s390_regs_set(struct task_struct *target,
799 const struct user_regset *regset,
800 unsigned int pos, unsigned int count,
801 const void *kbuf, const void __user *ubuf)
802{
803 int rc = 0;
804
805 if (target == current)
806 save_access_regs(target->thread.acrs);
807
808 if (kbuf) {
809 const unsigned long *k = kbuf;
810 while (count > 0 && !rc) {
811 rc = __poke_user(target, pos, *k++);
812 count -= sizeof(*k);
813 pos += sizeof(*k);
814 }
815 } else {
816 const unsigned long __user *u = ubuf;
817 while (count > 0 && !rc) {
818 unsigned long word;
819 rc = __get_user(word, u++);
820 if (rc)
821 break;
822 rc = __poke_user(target, pos, word);
823 count -= sizeof(*u);
824 pos += sizeof(*u);
825 }
826 }
827
828 if (rc == 0 && target == current)
829 restore_access_regs(target->thread.acrs);
830
831 return rc;
832}
833
834static int s390_fpregs_get(struct task_struct *target,
835 const struct user_regset *regset, unsigned int pos,
836 unsigned int count, void *kbuf, void __user *ubuf)
837{
838 if (target == current)
839 save_fp_regs(&target->thread.fp_regs);
840
841 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
842 &target->thread.fp_regs, 0, -1);
843}
844
845static int s390_fpregs_set(struct task_struct *target,
846 const struct user_regset *regset, unsigned int pos,
847 unsigned int count, const void *kbuf,
848 const void __user *ubuf)
849{
850 int rc = 0;
851
852 if (target == current)
853 save_fp_regs(&target->thread.fp_regs);
854
855 /* If setting FPC, must validate it first. */
856 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
857 u32 fpc[2] = { target->thread.fp_regs.fpc, 0 };
858 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc,
859 0, offsetof(s390_fp_regs, fprs));
860 if (rc)
861 return rc;
862 if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0)
863 return -EINVAL;
864 target->thread.fp_regs.fpc = fpc[0];
865 }
866
867 if (rc == 0 && count > 0)
868 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
869 target->thread.fp_regs.fprs,
870 offsetof(s390_fp_regs, fprs), -1);
871
872 if (rc == 0 && target == current)
873 restore_fp_regs(&target->thread.fp_regs);
874
875 return rc;
876}
877
878#ifdef CONFIG_64BIT
879
880static int s390_last_break_get(struct task_struct *target,
881 const struct user_regset *regset,
882 unsigned int pos, unsigned int count,
883 void *kbuf, void __user *ubuf)
884{
885 if (count > 0) {
886 if (kbuf) {
887 unsigned long *k = kbuf;
888 *k = task_thread_info(target)->last_break;
889 } else {
890 unsigned long __user *u = ubuf;
891 if (__put_user(task_thread_info(target)->last_break, u))
892 return -EFAULT;
893 }
894 }
895 return 0;
896}
897
898#endif
899
900static const struct user_regset s390_regsets[] = {
901 [REGSET_GENERAL] = {
902 .core_note_type = NT_PRSTATUS,
903 .n = sizeof(s390_regs) / sizeof(long),
904 .size = sizeof(long),
905 .align = sizeof(long),
906 .get = s390_regs_get,
907 .set = s390_regs_set,
908 },
909 [REGSET_FP] = {
910 .core_note_type = NT_PRFPREG,
911 .n = sizeof(s390_fp_regs) / sizeof(long),
912 .size = sizeof(long),
913 .align = sizeof(long),
914 .get = s390_fpregs_get,
915 .set = s390_fpregs_set,
916 },
917#ifdef CONFIG_64BIT
918 [REGSET_LAST_BREAK] = {
919 .core_note_type = NT_S390_LAST_BREAK,
920 .n = 1,
921 .size = sizeof(long),
922 .align = sizeof(long),
923 .get = s390_last_break_get,
924 },
925#endif
926};
927
928static const struct user_regset_view user_s390_view = {
929 .name = UTS_MACHINE,
930 .e_machine = EM_S390,
931 .regsets = s390_regsets,
932 .n = ARRAY_SIZE(s390_regsets)
933};
934
935#ifdef CONFIG_COMPAT
936static int s390_compat_regs_get(struct task_struct *target,
937 const struct user_regset *regset,
938 unsigned int pos, unsigned int count,
939 void *kbuf, void __user *ubuf)
940{
941 if (target == current)
942 save_access_regs(target->thread.acrs);
943
944 if (kbuf) {
945 compat_ulong_t *k = kbuf;
946 while (count > 0) {
947 *k++ = __peek_user_compat(target, pos);
948 count -= sizeof(*k);
949 pos += sizeof(*k);
950 }
951 } else {
952 compat_ulong_t __user *u = ubuf;
953 while (count > 0) {
954 if (__put_user(__peek_user_compat(target, pos), u++))
955 return -EFAULT;
956 count -= sizeof(*u);
957 pos += sizeof(*u);
958 }
959 }
960 return 0;
961}
962
963static int s390_compat_regs_set(struct task_struct *target,
964 const struct user_regset *regset,
965 unsigned int pos, unsigned int count,
966 const void *kbuf, const void __user *ubuf)
967{
968 int rc = 0;
969
970 if (target == current)
971 save_access_regs(target->thread.acrs);
972
973 if (kbuf) {
974 const compat_ulong_t *k = kbuf;
975 while (count > 0 && !rc) {
976 rc = __poke_user_compat(target, pos, *k++);
977 count -= sizeof(*k);
978 pos += sizeof(*k);
979 }
980 } else {
981 const compat_ulong_t __user *u = ubuf;
982 while (count > 0 && !rc) {
983 compat_ulong_t word;
984 rc = __get_user(word, u++);
985 if (rc)
986 break;
987 rc = __poke_user_compat(target, pos, word);
988 count -= sizeof(*u);
989 pos += sizeof(*u);
990 }
991 }
992
993 if (rc == 0 && target == current)
994 restore_access_regs(target->thread.acrs);
995
996 return rc;
997}
998
999static int s390_compat_regs_high_get(struct task_struct *target,
1000 const struct user_regset *regset,
1001 unsigned int pos, unsigned int count,
1002 void *kbuf, void __user *ubuf)
1003{
1004 compat_ulong_t *gprs_high;
1005
1006 gprs_high = (compat_ulong_t *)
1007 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1008 if (kbuf) {
1009 compat_ulong_t *k = kbuf;
1010 while (count > 0) {
1011 *k++ = *gprs_high;
1012 gprs_high += 2;
1013 count -= sizeof(*k);
1014 }
1015 } else {
1016 compat_ulong_t __user *u = ubuf;
1017 while (count > 0) {
1018 if (__put_user(*gprs_high, u++))
1019 return -EFAULT;
1020 gprs_high += 2;
1021 count -= sizeof(*u);
1022 }
1023 }
1024 return 0;
1025}
1026
1027static int s390_compat_regs_high_set(struct task_struct *target,
1028 const struct user_regset *regset,
1029 unsigned int pos, unsigned int count,
1030 const void *kbuf, const void __user *ubuf)
1031{
1032 compat_ulong_t *gprs_high;
1033 int rc = 0;
1034
1035 gprs_high = (compat_ulong_t *)
1036 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1037 if (kbuf) {
1038 const compat_ulong_t *k = kbuf;
1039 while (count > 0) {
1040 *gprs_high = *k++;
1041 *gprs_high += 2;
1042 count -= sizeof(*k);
1043 }
1044 } else {
1045 const compat_ulong_t __user *u = ubuf;
1046 while (count > 0 && !rc) {
1047 unsigned long word;
1048 rc = __get_user(word, u++);
1049 if (rc)
1050 break;
1051 *gprs_high = word;
1052 *gprs_high += 2;
1053 count -= sizeof(*u);
1054 }
1055 }
1056
1057 return rc;
1058}
1059
1060static int s390_compat_last_break_get(struct task_struct *target,
1061 const struct user_regset *regset,
1062 unsigned int pos, unsigned int count,
1063 void *kbuf, void __user *ubuf)
1064{
1065 compat_ulong_t last_break;
1066
1067 if (count > 0) {
1068 last_break = task_thread_info(target)->last_break;
1069 if (kbuf) {
1070 unsigned long *k = kbuf;
1071 *k = last_break;
1072 } else {
1073 unsigned long __user *u = ubuf;
1074 if (__put_user(last_break, u))
1075 return -EFAULT;
1076 }
1077 }
1078 return 0;
1079}
1080
1081static const struct user_regset s390_compat_regsets[] = {
1082 [REGSET_GENERAL] = {
1083 .core_note_type = NT_PRSTATUS,
1084 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1085 .size = sizeof(compat_long_t),
1086 .align = sizeof(compat_long_t),
1087 .get = s390_compat_regs_get,
1088 .set = s390_compat_regs_set,
1089 },
1090 [REGSET_FP] = {
1091 .core_note_type = NT_PRFPREG,
1092 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1093 .size = sizeof(compat_long_t),
1094 .align = sizeof(compat_long_t),
1095 .get = s390_fpregs_get,
1096 .set = s390_fpregs_set,
1097 },
1098 [REGSET_LAST_BREAK] = {
1099 .core_note_type = NT_S390_LAST_BREAK,
1100 .n = 1,
1101 .size = sizeof(long),
1102 .align = sizeof(long),
1103 .get = s390_compat_last_break_get,
1104 },
1105 [REGSET_GENERAL_EXTENDED] = {
1106 .core_note_type = NT_S390_HIGH_GPRS,
1107 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1108 .size = sizeof(compat_long_t),
1109 .align = sizeof(compat_long_t),
1110 .get = s390_compat_regs_high_get,
1111 .set = s390_compat_regs_high_set,
1112 },
1113};
1114
1115static const struct user_regset_view user_s390_compat_view = {
1116 .name = "s390",
1117 .e_machine = EM_S390,
1118 .regsets = s390_compat_regsets,
1119 .n = ARRAY_SIZE(s390_compat_regsets)
1120};
1121#endif
1122
1123const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1124{
1125#ifdef CONFIG_COMPAT
1126 if (test_tsk_thread_flag(task, TIF_31BIT))
1127 return &user_s390_compat_view;
1128#endif
1129 return &user_s390_view;
1130}
1131
1132static const char *gpr_names[NUM_GPRS] = {
1133 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1134 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1135};
1136
1137unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1138{
1139 if (offset >= NUM_GPRS)
1140 return 0;
1141 return regs->gprs[offset];
1142}
1143
1144int regs_query_register_offset(const char *name)
1145{
1146 unsigned long offset;
1147
1148 if (!name || *name != 'r')
1149 return -EINVAL;
1150 if (strict_strtoul(name + 1, 10, &offset))
1151 return -EINVAL;
1152 if (offset >= NUM_GPRS)
1153 return -EINVAL;
1154 return offset;
1155}
1156
1157const char *regs_query_register_name(unsigned int offset)
1158{
1159 if (offset >= NUM_GPRS)
1160 return NULL;
1161 return gpr_names[offset];
1162}
1163
1164static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1165{
1166 unsigned long ksp = kernel_stack_pointer(regs);
1167
1168 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1169}
1170
1171/**
1172 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1173 * @regs:pt_regs which contains kernel stack pointer.
1174 * @n:stack entry number.
1175 *
1176 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1177 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1178 * this returns 0.
1179 */
1180unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1181{
1182 unsigned long addr;
1183
1184 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1185 if (!regs_within_kernel_stack(regs, addr))
1186 return 0;
1187 return *(unsigned long *)addr;
1188}
1/*
2 * Ptrace user space interface.
3 *
4 * Copyright IBM Corp. 1999, 2010
5 * Author(s): Denis Joseph Barrow
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/errno.h>
14#include <linux/ptrace.h>
15#include <linux/user.h>
16#include <linux/security.h>
17#include <linux/audit.h>
18#include <linux/signal.h>
19#include <linux/elf.h>
20#include <linux/regset.h>
21#include <linux/tracehook.h>
22#include <linux/seccomp.h>
23#include <linux/compat.h>
24#include <trace/syscall.h>
25#include <asm/segment.h>
26#include <asm/page.h>
27#include <asm/pgtable.h>
28#include <asm/pgalloc.h>
29#include <asm/uaccess.h>
30#include <asm/unistd.h>
31#include <asm/switch_to.h>
32#include "entry.h"
33
34#ifdef CONFIG_COMPAT
35#include "compat_ptrace.h"
36#endif
37
38#define CREATE_TRACE_POINTS
39#include <trace/events/syscalls.h>
40
41enum s390_regset {
42 REGSET_GENERAL,
43 REGSET_FP,
44 REGSET_LAST_BREAK,
45 REGSET_TDB,
46 REGSET_SYSTEM_CALL,
47 REGSET_GENERAL_EXTENDED,
48};
49
50void update_cr_regs(struct task_struct *task)
51{
52 struct pt_regs *regs = task_pt_regs(task);
53 struct thread_struct *thread = &task->thread;
54 struct per_regs old, new;
55
56#ifdef CONFIG_64BIT
57 /* Take care of the enable/disable of transactional execution. */
58 if (MACHINE_HAS_TE) {
59 unsigned long cr, cr_new;
60
61 __ctl_store(cr, 0, 0);
62 /* Set or clear transaction execution TXC bit 8. */
63 cr_new = cr | (1UL << 55);
64 if (task->thread.per_flags & PER_FLAG_NO_TE)
65 cr_new &= ~(1UL << 55);
66 if (cr_new != cr)
67 __ctl_load(cr_new, 0, 0);
68 /* Set or clear transaction execution TDC bits 62 and 63. */
69 __ctl_store(cr, 2, 2);
70 cr_new = cr & ~3UL;
71 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
72 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
73 cr_new |= 1UL;
74 else
75 cr_new |= 2UL;
76 }
77 if (cr_new != cr)
78 __ctl_load(cr_new, 2, 2);
79 }
80#endif
81 /* Copy user specified PER registers */
82 new.control = thread->per_user.control;
83 new.start = thread->per_user.start;
84 new.end = thread->per_user.end;
85
86 /* merge TIF_SINGLE_STEP into user specified PER registers. */
87 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) {
88 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
89 new.control |= PER_EVENT_BRANCH;
90 else
91 new.control |= PER_EVENT_IFETCH;
92#ifdef CONFIG_64BIT
93 new.control |= PER_CONTROL_SUSPENSION;
94 new.control |= PER_EVENT_TRANSACTION_END;
95#endif
96 new.start = 0;
97 new.end = PSW_ADDR_INSN;
98 }
99
100 /* Take care of the PER enablement bit in the PSW. */
101 if (!(new.control & PER_EVENT_MASK)) {
102 regs->psw.mask &= ~PSW_MASK_PER;
103 return;
104 }
105 regs->psw.mask |= PSW_MASK_PER;
106 __ctl_store(old, 9, 11);
107 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
108 __ctl_load(new, 9, 11);
109}
110
111void user_enable_single_step(struct task_struct *task)
112{
113 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
114 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
115}
116
117void user_disable_single_step(struct task_struct *task)
118{
119 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
120 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
121}
122
123void user_enable_block_step(struct task_struct *task)
124{
125 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
126 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
127}
128
129/*
130 * Called by kernel/ptrace.c when detaching..
131 *
132 * Clear all debugging related fields.
133 */
134void ptrace_disable(struct task_struct *task)
135{
136 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
137 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
138 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
139 clear_tsk_thread_flag(task, TIF_PER_TRAP);
140 task->thread.per_flags = 0;
141}
142
143#ifndef CONFIG_64BIT
144# define __ADDR_MASK 3
145#else
146# define __ADDR_MASK 7
147#endif
148
149static inline unsigned long __peek_user_per(struct task_struct *child,
150 addr_t addr)
151{
152 struct per_struct_kernel *dummy = NULL;
153
154 if (addr == (addr_t) &dummy->cr9)
155 /* Control bits of the active per set. */
156 return test_thread_flag(TIF_SINGLE_STEP) ?
157 PER_EVENT_IFETCH : child->thread.per_user.control;
158 else if (addr == (addr_t) &dummy->cr10)
159 /* Start address of the active per set. */
160 return test_thread_flag(TIF_SINGLE_STEP) ?
161 0 : child->thread.per_user.start;
162 else if (addr == (addr_t) &dummy->cr11)
163 /* End address of the active per set. */
164 return test_thread_flag(TIF_SINGLE_STEP) ?
165 PSW_ADDR_INSN : child->thread.per_user.end;
166 else if (addr == (addr_t) &dummy->bits)
167 /* Single-step bit. */
168 return test_thread_flag(TIF_SINGLE_STEP) ?
169 (1UL << (BITS_PER_LONG - 1)) : 0;
170 else if (addr == (addr_t) &dummy->starting_addr)
171 /* Start address of the user specified per set. */
172 return child->thread.per_user.start;
173 else if (addr == (addr_t) &dummy->ending_addr)
174 /* End address of the user specified per set. */
175 return child->thread.per_user.end;
176 else if (addr == (addr_t) &dummy->perc_atmid)
177 /* PER code, ATMID and AI of the last PER trap */
178 return (unsigned long)
179 child->thread.per_event.cause << (BITS_PER_LONG - 16);
180 else if (addr == (addr_t) &dummy->address)
181 /* Address of the last PER trap */
182 return child->thread.per_event.address;
183 else if (addr == (addr_t) &dummy->access_id)
184 /* Access id of the last PER trap */
185 return (unsigned long)
186 child->thread.per_event.paid << (BITS_PER_LONG - 8);
187 return 0;
188}
189
190/*
191 * Read the word at offset addr from the user area of a process. The
192 * trouble here is that the information is littered over different
193 * locations. The process registers are found on the kernel stack,
194 * the floating point stuff and the trace settings are stored in
195 * the task structure. In addition the different structures in
196 * struct user contain pad bytes that should be read as zeroes.
197 * Lovely...
198 */
199static unsigned long __peek_user(struct task_struct *child, addr_t addr)
200{
201 struct user *dummy = NULL;
202 addr_t offset, tmp;
203
204 if (addr < (addr_t) &dummy->regs.acrs) {
205 /*
206 * psw and gprs are stored on the stack
207 */
208 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
209 if (addr == (addr_t) &dummy->regs.psw.mask) {
210 /* Return a clean psw mask. */
211 tmp &= PSW_MASK_USER | PSW_MASK_RI;
212 tmp |= PSW_USER_BITS;
213 }
214
215 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
216 /*
217 * access registers are stored in the thread structure
218 */
219 offset = addr - (addr_t) &dummy->regs.acrs;
220#ifdef CONFIG_64BIT
221 /*
222 * Very special case: old & broken 64 bit gdb reading
223 * from acrs[15]. Result is a 64 bit value. Read the
224 * 32 bit acrs[15] value and shift it by 32. Sick...
225 */
226 if (addr == (addr_t) &dummy->regs.acrs[15])
227 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
228 else
229#endif
230 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
231
232 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
233 /*
234 * orig_gpr2 is stored on the kernel stack
235 */
236 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
237
238 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
239 /*
240 * prevent reads of padding hole between
241 * orig_gpr2 and fp_regs on s390.
242 */
243 tmp = 0;
244
245 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
246 /*
247 * floating point regs. are stored in the thread structure
248 */
249 offset = addr - (addr_t) &dummy->regs.fp_regs;
250 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
251 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
252 tmp <<= BITS_PER_LONG - 32;
253
254 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
255 /*
256 * Handle access to the per_info structure.
257 */
258 addr -= (addr_t) &dummy->regs.per_info;
259 tmp = __peek_user_per(child, addr);
260
261 } else
262 tmp = 0;
263
264 return tmp;
265}
266
267static int
268peek_user(struct task_struct *child, addr_t addr, addr_t data)
269{
270 addr_t tmp, mask;
271
272 /*
273 * Stupid gdb peeks/pokes the access registers in 64 bit with
274 * an alignment of 4. Programmers from hell...
275 */
276 mask = __ADDR_MASK;
277#ifdef CONFIG_64BIT
278 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
279 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
280 mask = 3;
281#endif
282 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
283 return -EIO;
284
285 tmp = __peek_user(child, addr);
286 return put_user(tmp, (addr_t __user *) data);
287}
288
289static inline void __poke_user_per(struct task_struct *child,
290 addr_t addr, addr_t data)
291{
292 struct per_struct_kernel *dummy = NULL;
293
294 /*
295 * There are only three fields in the per_info struct that the
296 * debugger user can write to.
297 * 1) cr9: the debugger wants to set a new PER event mask
298 * 2) starting_addr: the debugger wants to set a new starting
299 * address to use with the PER event mask.
300 * 3) ending_addr: the debugger wants to set a new ending
301 * address to use with the PER event mask.
302 * The user specified PER event mask and the start and end
303 * addresses are used only if single stepping is not in effect.
304 * Writes to any other field in per_info are ignored.
305 */
306 if (addr == (addr_t) &dummy->cr9)
307 /* PER event mask of the user specified per set. */
308 child->thread.per_user.control =
309 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
310 else if (addr == (addr_t) &dummy->starting_addr)
311 /* Starting address of the user specified per set. */
312 child->thread.per_user.start = data;
313 else if (addr == (addr_t) &dummy->ending_addr)
314 /* Ending address of the user specified per set. */
315 child->thread.per_user.end = data;
316}
317
318/*
319 * Write a word to the user area of a process at location addr. This
320 * operation does have an additional problem compared to peek_user.
321 * Stores to the program status word and on the floating point
322 * control register needs to get checked for validity.
323 */
324static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
325{
326 struct user *dummy = NULL;
327 addr_t offset;
328
329 if (addr < (addr_t) &dummy->regs.acrs) {
330 /*
331 * psw and gprs are stored on the stack
332 */
333 if (addr == (addr_t) &dummy->regs.psw.mask) {
334 unsigned long mask = PSW_MASK_USER;
335
336 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
337 if ((data & ~mask) != PSW_USER_BITS)
338 return -EINVAL;
339 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
340 return -EINVAL;
341 }
342 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
343
344 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
345 /*
346 * access registers are stored in the thread structure
347 */
348 offset = addr - (addr_t) &dummy->regs.acrs;
349#ifdef CONFIG_64BIT
350 /*
351 * Very special case: old & broken 64 bit gdb writing
352 * to acrs[15] with a 64 bit value. Ignore the lower
353 * half of the value and write the upper 32 bit to
354 * acrs[15]. Sick...
355 */
356 if (addr == (addr_t) &dummy->regs.acrs[15])
357 child->thread.acrs[15] = (unsigned int) (data >> 32);
358 else
359#endif
360 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
361
362 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
363 /*
364 * orig_gpr2 is stored on the kernel stack
365 */
366 task_pt_regs(child)->orig_gpr2 = data;
367
368 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
369 /*
370 * prevent writes of padding hole between
371 * orig_gpr2 and fp_regs on s390.
372 */
373 return 0;
374
375 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
376 /*
377 * floating point regs. are stored in the thread structure
378 */
379 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
380 if ((unsigned int) data != 0 ||
381 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
382 return -EINVAL;
383 offset = addr - (addr_t) &dummy->regs.fp_regs;
384 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
385
386 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
387 /*
388 * Handle access to the per_info structure.
389 */
390 addr -= (addr_t) &dummy->regs.per_info;
391 __poke_user_per(child, addr, data);
392
393 }
394
395 return 0;
396}
397
398static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
399{
400 addr_t mask;
401
402 /*
403 * Stupid gdb peeks/pokes the access registers in 64 bit with
404 * an alignment of 4. Programmers from hell indeed...
405 */
406 mask = __ADDR_MASK;
407#ifdef CONFIG_64BIT
408 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
409 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
410 mask = 3;
411#endif
412 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
413 return -EIO;
414
415 return __poke_user(child, addr, data);
416}
417
418long arch_ptrace(struct task_struct *child, long request,
419 unsigned long addr, unsigned long data)
420{
421 ptrace_area parea;
422 int copied, ret;
423
424 switch (request) {
425 case PTRACE_PEEKUSR:
426 /* read the word at location addr in the USER area. */
427 return peek_user(child, addr, data);
428
429 case PTRACE_POKEUSR:
430 /* write the word at location addr in the USER area */
431 return poke_user(child, addr, data);
432
433 case PTRACE_PEEKUSR_AREA:
434 case PTRACE_POKEUSR_AREA:
435 if (copy_from_user(&parea, (void __force __user *) addr,
436 sizeof(parea)))
437 return -EFAULT;
438 addr = parea.kernel_addr;
439 data = parea.process_addr;
440 copied = 0;
441 while (copied < parea.len) {
442 if (request == PTRACE_PEEKUSR_AREA)
443 ret = peek_user(child, addr, data);
444 else {
445 addr_t utmp;
446 if (get_user(utmp,
447 (addr_t __force __user *) data))
448 return -EFAULT;
449 ret = poke_user(child, addr, utmp);
450 }
451 if (ret)
452 return ret;
453 addr += sizeof(unsigned long);
454 data += sizeof(unsigned long);
455 copied += sizeof(unsigned long);
456 }
457 return 0;
458 case PTRACE_GET_LAST_BREAK:
459 put_user(task_thread_info(child)->last_break,
460 (unsigned long __user *) data);
461 return 0;
462 case PTRACE_ENABLE_TE:
463 if (!MACHINE_HAS_TE)
464 return -EIO;
465 child->thread.per_flags &= ~PER_FLAG_NO_TE;
466 return 0;
467 case PTRACE_DISABLE_TE:
468 if (!MACHINE_HAS_TE)
469 return -EIO;
470 child->thread.per_flags |= PER_FLAG_NO_TE;
471 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
472 return 0;
473 case PTRACE_TE_ABORT_RAND:
474 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
475 return -EIO;
476 switch (data) {
477 case 0UL:
478 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
479 break;
480 case 1UL:
481 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
482 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
483 break;
484 case 2UL:
485 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
486 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
487 break;
488 default:
489 return -EINVAL;
490 }
491 return 0;
492 default:
493 /* Removing high order bit from addr (only for 31 bit). */
494 addr &= PSW_ADDR_INSN;
495 return ptrace_request(child, request, addr, data);
496 }
497}
498
499#ifdef CONFIG_COMPAT
500/*
501 * Now the fun part starts... a 31 bit program running in the
502 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
503 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
504 * to handle, the difference to the 64 bit versions of the requests
505 * is that the access is done in multiples of 4 byte instead of
506 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
507 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
508 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
509 * is a 31 bit program too, the content of struct user can be
510 * emulated. A 31 bit program peeking into the struct user of
511 * a 64 bit program is a no-no.
512 */
513
514/*
515 * Same as peek_user_per but for a 31 bit program.
516 */
517static inline __u32 __peek_user_per_compat(struct task_struct *child,
518 addr_t addr)
519{
520 struct compat_per_struct_kernel *dummy32 = NULL;
521
522 if (addr == (addr_t) &dummy32->cr9)
523 /* Control bits of the active per set. */
524 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
525 PER_EVENT_IFETCH : child->thread.per_user.control;
526 else if (addr == (addr_t) &dummy32->cr10)
527 /* Start address of the active per set. */
528 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
529 0 : child->thread.per_user.start;
530 else if (addr == (addr_t) &dummy32->cr11)
531 /* End address of the active per set. */
532 return test_thread_flag(TIF_SINGLE_STEP) ?
533 PSW32_ADDR_INSN : child->thread.per_user.end;
534 else if (addr == (addr_t) &dummy32->bits)
535 /* Single-step bit. */
536 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
537 0x80000000 : 0;
538 else if (addr == (addr_t) &dummy32->starting_addr)
539 /* Start address of the user specified per set. */
540 return (__u32) child->thread.per_user.start;
541 else if (addr == (addr_t) &dummy32->ending_addr)
542 /* End address of the user specified per set. */
543 return (__u32) child->thread.per_user.end;
544 else if (addr == (addr_t) &dummy32->perc_atmid)
545 /* PER code, ATMID and AI of the last PER trap */
546 return (__u32) child->thread.per_event.cause << 16;
547 else if (addr == (addr_t) &dummy32->address)
548 /* Address of the last PER trap */
549 return (__u32) child->thread.per_event.address;
550 else if (addr == (addr_t) &dummy32->access_id)
551 /* Access id of the last PER trap */
552 return (__u32) child->thread.per_event.paid << 24;
553 return 0;
554}
555
556/*
557 * Same as peek_user but for a 31 bit program.
558 */
559static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
560{
561 struct compat_user *dummy32 = NULL;
562 addr_t offset;
563 __u32 tmp;
564
565 if (addr < (addr_t) &dummy32->regs.acrs) {
566 struct pt_regs *regs = task_pt_regs(child);
567 /*
568 * psw and gprs are stored on the stack
569 */
570 if (addr == (addr_t) &dummy32->regs.psw.mask) {
571 /* Fake a 31 bit psw mask. */
572 tmp = (__u32)(regs->psw.mask >> 32);
573 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
574 tmp |= PSW32_USER_BITS;
575 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
576 /* Fake a 31 bit psw address. */
577 tmp = (__u32) regs->psw.addr |
578 (__u32)(regs->psw.mask & PSW_MASK_BA);
579 } else {
580 /* gpr 0-15 */
581 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
582 }
583 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
584 /*
585 * access registers are stored in the thread structure
586 */
587 offset = addr - (addr_t) &dummy32->regs.acrs;
588 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
589
590 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
591 /*
592 * orig_gpr2 is stored on the kernel stack
593 */
594 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
595
596 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
597 /*
598 * prevent reads of padding hole between
599 * orig_gpr2 and fp_regs on s390.
600 */
601 tmp = 0;
602
603 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
604 /*
605 * floating point regs. are stored in the thread structure
606 */
607 offset = addr - (addr_t) &dummy32->regs.fp_regs;
608 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
609
610 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
611 /*
612 * Handle access to the per_info structure.
613 */
614 addr -= (addr_t) &dummy32->regs.per_info;
615 tmp = __peek_user_per_compat(child, addr);
616
617 } else
618 tmp = 0;
619
620 return tmp;
621}
622
623static int peek_user_compat(struct task_struct *child,
624 addr_t addr, addr_t data)
625{
626 __u32 tmp;
627
628 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
629 return -EIO;
630
631 tmp = __peek_user_compat(child, addr);
632 return put_user(tmp, (__u32 __user *) data);
633}
634
635/*
636 * Same as poke_user_per but for a 31 bit program.
637 */
638static inline void __poke_user_per_compat(struct task_struct *child,
639 addr_t addr, __u32 data)
640{
641 struct compat_per_struct_kernel *dummy32 = NULL;
642
643 if (addr == (addr_t) &dummy32->cr9)
644 /* PER event mask of the user specified per set. */
645 child->thread.per_user.control =
646 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
647 else if (addr == (addr_t) &dummy32->starting_addr)
648 /* Starting address of the user specified per set. */
649 child->thread.per_user.start = data;
650 else if (addr == (addr_t) &dummy32->ending_addr)
651 /* Ending address of the user specified per set. */
652 child->thread.per_user.end = data;
653}
654
655/*
656 * Same as poke_user but for a 31 bit program.
657 */
658static int __poke_user_compat(struct task_struct *child,
659 addr_t addr, addr_t data)
660{
661 struct compat_user *dummy32 = NULL;
662 __u32 tmp = (__u32) data;
663 addr_t offset;
664
665 if (addr < (addr_t) &dummy32->regs.acrs) {
666 struct pt_regs *regs = task_pt_regs(child);
667 /*
668 * psw, gprs, acrs and orig_gpr2 are stored on the stack
669 */
670 if (addr == (addr_t) &dummy32->regs.psw.mask) {
671 __u32 mask = PSW32_MASK_USER;
672
673 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
674 /* Build a 64 bit psw mask from 31 bit mask. */
675 if ((tmp & ~mask) != PSW32_USER_BITS)
676 /* Invalid psw mask. */
677 return -EINVAL;
678 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
679 (regs->psw.mask & PSW_MASK_BA) |
680 (__u64)(tmp & mask) << 32;
681 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
682 /* Build a 64 bit psw address from 31 bit address. */
683 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
684 /* Transfer 31 bit amode bit to psw mask. */
685 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
686 (__u64)(tmp & PSW32_ADDR_AMODE);
687 } else {
688 /* gpr 0-15 */
689 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
690 }
691 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
692 /*
693 * access registers are stored in the thread structure
694 */
695 offset = addr - (addr_t) &dummy32->regs.acrs;
696 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
697
698 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
699 /*
700 * orig_gpr2 is stored on the kernel stack
701 */
702 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
703
704 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
705 /*
706 * prevent writess of padding hole between
707 * orig_gpr2 and fp_regs on s390.
708 */
709 return 0;
710
711 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
712 /*
713 * floating point regs. are stored in the thread structure
714 */
715 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
716 test_fp_ctl(tmp))
717 return -EINVAL;
718 offset = addr - (addr_t) &dummy32->regs.fp_regs;
719 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
720
721 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
722 /*
723 * Handle access to the per_info structure.
724 */
725 addr -= (addr_t) &dummy32->regs.per_info;
726 __poke_user_per_compat(child, addr, data);
727 }
728
729 return 0;
730}
731
732static int poke_user_compat(struct task_struct *child,
733 addr_t addr, addr_t data)
734{
735 if (!is_compat_task() || (addr & 3) ||
736 addr > sizeof(struct compat_user) - 3)
737 return -EIO;
738
739 return __poke_user_compat(child, addr, data);
740}
741
742long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
743 compat_ulong_t caddr, compat_ulong_t cdata)
744{
745 unsigned long addr = caddr;
746 unsigned long data = cdata;
747 compat_ptrace_area parea;
748 int copied, ret;
749
750 switch (request) {
751 case PTRACE_PEEKUSR:
752 /* read the word at location addr in the USER area. */
753 return peek_user_compat(child, addr, data);
754
755 case PTRACE_POKEUSR:
756 /* write the word at location addr in the USER area */
757 return poke_user_compat(child, addr, data);
758
759 case PTRACE_PEEKUSR_AREA:
760 case PTRACE_POKEUSR_AREA:
761 if (copy_from_user(&parea, (void __force __user *) addr,
762 sizeof(parea)))
763 return -EFAULT;
764 addr = parea.kernel_addr;
765 data = parea.process_addr;
766 copied = 0;
767 while (copied < parea.len) {
768 if (request == PTRACE_PEEKUSR_AREA)
769 ret = peek_user_compat(child, addr, data);
770 else {
771 __u32 utmp;
772 if (get_user(utmp,
773 (__u32 __force __user *) data))
774 return -EFAULT;
775 ret = poke_user_compat(child, addr, utmp);
776 }
777 if (ret)
778 return ret;
779 addr += sizeof(unsigned int);
780 data += sizeof(unsigned int);
781 copied += sizeof(unsigned int);
782 }
783 return 0;
784 case PTRACE_GET_LAST_BREAK:
785 put_user(task_thread_info(child)->last_break,
786 (unsigned int __user *) data);
787 return 0;
788 }
789 return compat_ptrace_request(child, request, addr, data);
790}
791#endif
792
793asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
794{
795 long ret = 0;
796
797 /* Do the secure computing check first. */
798 if (secure_computing(regs->gprs[2])) {
799 /* seccomp failures shouldn't expose any additional code. */
800 ret = -1;
801 goto out;
802 }
803
804 /*
805 * The sysc_tracesys code in entry.S stored the system
806 * call number to gprs[2].
807 */
808 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
809 (tracehook_report_syscall_entry(regs) ||
810 regs->gprs[2] >= NR_syscalls)) {
811 /*
812 * Tracing decided this syscall should not happen or the
813 * debugger stored an invalid system call number. Skip
814 * the system call and the system call restart handling.
815 */
816 clear_thread_flag(TIF_SYSCALL);
817 ret = -1;
818 }
819
820 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
821 trace_sys_enter(regs, regs->gprs[2]);
822
823 audit_syscall_entry(is_compat_task() ?
824 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
825 regs->gprs[2], regs->orig_gpr2,
826 regs->gprs[3], regs->gprs[4],
827 regs->gprs[5]);
828out:
829 return ret ?: regs->gprs[2];
830}
831
832asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
833{
834 audit_syscall_exit(regs);
835
836 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
837 trace_sys_exit(regs, regs->gprs[2]);
838
839 if (test_thread_flag(TIF_SYSCALL_TRACE))
840 tracehook_report_syscall_exit(regs, 0);
841}
842
843/*
844 * user_regset definitions.
845 */
846
847static int s390_regs_get(struct task_struct *target,
848 const struct user_regset *regset,
849 unsigned int pos, unsigned int count,
850 void *kbuf, void __user *ubuf)
851{
852 if (target == current)
853 save_access_regs(target->thread.acrs);
854
855 if (kbuf) {
856 unsigned long *k = kbuf;
857 while (count > 0) {
858 *k++ = __peek_user(target, pos);
859 count -= sizeof(*k);
860 pos += sizeof(*k);
861 }
862 } else {
863 unsigned long __user *u = ubuf;
864 while (count > 0) {
865 if (__put_user(__peek_user(target, pos), u++))
866 return -EFAULT;
867 count -= sizeof(*u);
868 pos += sizeof(*u);
869 }
870 }
871 return 0;
872}
873
874static int s390_regs_set(struct task_struct *target,
875 const struct user_regset *regset,
876 unsigned int pos, unsigned int count,
877 const void *kbuf, const void __user *ubuf)
878{
879 int rc = 0;
880
881 if (target == current)
882 save_access_regs(target->thread.acrs);
883
884 if (kbuf) {
885 const unsigned long *k = kbuf;
886 while (count > 0 && !rc) {
887 rc = __poke_user(target, pos, *k++);
888 count -= sizeof(*k);
889 pos += sizeof(*k);
890 }
891 } else {
892 const unsigned long __user *u = ubuf;
893 while (count > 0 && !rc) {
894 unsigned long word;
895 rc = __get_user(word, u++);
896 if (rc)
897 break;
898 rc = __poke_user(target, pos, word);
899 count -= sizeof(*u);
900 pos += sizeof(*u);
901 }
902 }
903
904 if (rc == 0 && target == current)
905 restore_access_regs(target->thread.acrs);
906
907 return rc;
908}
909
910static int s390_fpregs_get(struct task_struct *target,
911 const struct user_regset *regset, unsigned int pos,
912 unsigned int count, void *kbuf, void __user *ubuf)
913{
914 if (target == current) {
915 save_fp_ctl(&target->thread.fp_regs.fpc);
916 save_fp_regs(target->thread.fp_regs.fprs);
917 }
918
919 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
920 &target->thread.fp_regs, 0, -1);
921}
922
923static int s390_fpregs_set(struct task_struct *target,
924 const struct user_regset *regset, unsigned int pos,
925 unsigned int count, const void *kbuf,
926 const void __user *ubuf)
927{
928 int rc = 0;
929
930 if (target == current) {
931 save_fp_ctl(&target->thread.fp_regs.fpc);
932 save_fp_regs(target->thread.fp_regs.fprs);
933 }
934
935 /* If setting FPC, must validate it first. */
936 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
937 u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 };
938 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
939 0, offsetof(s390_fp_regs, fprs));
940 if (rc)
941 return rc;
942 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
943 return -EINVAL;
944 target->thread.fp_regs.fpc = ufpc[0];
945 }
946
947 if (rc == 0 && count > 0)
948 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
949 target->thread.fp_regs.fprs,
950 offsetof(s390_fp_regs, fprs), -1);
951
952 if (rc == 0 && target == current) {
953 restore_fp_ctl(&target->thread.fp_regs.fpc);
954 restore_fp_regs(target->thread.fp_regs.fprs);
955 }
956
957 return rc;
958}
959
960#ifdef CONFIG_64BIT
961
962static int s390_last_break_get(struct task_struct *target,
963 const struct user_regset *regset,
964 unsigned int pos, unsigned int count,
965 void *kbuf, void __user *ubuf)
966{
967 if (count > 0) {
968 if (kbuf) {
969 unsigned long *k = kbuf;
970 *k = task_thread_info(target)->last_break;
971 } else {
972 unsigned long __user *u = ubuf;
973 if (__put_user(task_thread_info(target)->last_break, u))
974 return -EFAULT;
975 }
976 }
977 return 0;
978}
979
980static int s390_last_break_set(struct task_struct *target,
981 const struct user_regset *regset,
982 unsigned int pos, unsigned int count,
983 const void *kbuf, const void __user *ubuf)
984{
985 return 0;
986}
987
988static int s390_tdb_get(struct task_struct *target,
989 const struct user_regset *regset,
990 unsigned int pos, unsigned int count,
991 void *kbuf, void __user *ubuf)
992{
993 struct pt_regs *regs = task_pt_regs(target);
994 unsigned char *data;
995
996 if (!(regs->int_code & 0x200))
997 return -ENODATA;
998 data = target->thread.trap_tdb;
999 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1000}
1001
1002static int s390_tdb_set(struct task_struct *target,
1003 const struct user_regset *regset,
1004 unsigned int pos, unsigned int count,
1005 const void *kbuf, const void __user *ubuf)
1006{
1007 return 0;
1008}
1009
1010#endif
1011
1012static int s390_system_call_get(struct task_struct *target,
1013 const struct user_regset *regset,
1014 unsigned int pos, unsigned int count,
1015 void *kbuf, void __user *ubuf)
1016{
1017 unsigned int *data = &task_thread_info(target)->system_call;
1018 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1019 data, 0, sizeof(unsigned int));
1020}
1021
1022static int s390_system_call_set(struct task_struct *target,
1023 const struct user_regset *regset,
1024 unsigned int pos, unsigned int count,
1025 const void *kbuf, const void __user *ubuf)
1026{
1027 unsigned int *data = &task_thread_info(target)->system_call;
1028 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1029 data, 0, sizeof(unsigned int));
1030}
1031
1032static const struct user_regset s390_regsets[] = {
1033 [REGSET_GENERAL] = {
1034 .core_note_type = NT_PRSTATUS,
1035 .n = sizeof(s390_regs) / sizeof(long),
1036 .size = sizeof(long),
1037 .align = sizeof(long),
1038 .get = s390_regs_get,
1039 .set = s390_regs_set,
1040 },
1041 [REGSET_FP] = {
1042 .core_note_type = NT_PRFPREG,
1043 .n = sizeof(s390_fp_regs) / sizeof(long),
1044 .size = sizeof(long),
1045 .align = sizeof(long),
1046 .get = s390_fpregs_get,
1047 .set = s390_fpregs_set,
1048 },
1049#ifdef CONFIG_64BIT
1050 [REGSET_LAST_BREAK] = {
1051 .core_note_type = NT_S390_LAST_BREAK,
1052 .n = 1,
1053 .size = sizeof(long),
1054 .align = sizeof(long),
1055 .get = s390_last_break_get,
1056 .set = s390_last_break_set,
1057 },
1058 [REGSET_TDB] = {
1059 .core_note_type = NT_S390_TDB,
1060 .n = 1,
1061 .size = 256,
1062 .align = 1,
1063 .get = s390_tdb_get,
1064 .set = s390_tdb_set,
1065 },
1066#endif
1067 [REGSET_SYSTEM_CALL] = {
1068 .core_note_type = NT_S390_SYSTEM_CALL,
1069 .n = 1,
1070 .size = sizeof(unsigned int),
1071 .align = sizeof(unsigned int),
1072 .get = s390_system_call_get,
1073 .set = s390_system_call_set,
1074 },
1075};
1076
1077static const struct user_regset_view user_s390_view = {
1078 .name = UTS_MACHINE,
1079 .e_machine = EM_S390,
1080 .regsets = s390_regsets,
1081 .n = ARRAY_SIZE(s390_regsets)
1082};
1083
1084#ifdef CONFIG_COMPAT
1085static int s390_compat_regs_get(struct task_struct *target,
1086 const struct user_regset *regset,
1087 unsigned int pos, unsigned int count,
1088 void *kbuf, void __user *ubuf)
1089{
1090 if (target == current)
1091 save_access_regs(target->thread.acrs);
1092
1093 if (kbuf) {
1094 compat_ulong_t *k = kbuf;
1095 while (count > 0) {
1096 *k++ = __peek_user_compat(target, pos);
1097 count -= sizeof(*k);
1098 pos += sizeof(*k);
1099 }
1100 } else {
1101 compat_ulong_t __user *u = ubuf;
1102 while (count > 0) {
1103 if (__put_user(__peek_user_compat(target, pos), u++))
1104 return -EFAULT;
1105 count -= sizeof(*u);
1106 pos += sizeof(*u);
1107 }
1108 }
1109 return 0;
1110}
1111
1112static int s390_compat_regs_set(struct task_struct *target,
1113 const struct user_regset *regset,
1114 unsigned int pos, unsigned int count,
1115 const void *kbuf, const void __user *ubuf)
1116{
1117 int rc = 0;
1118
1119 if (target == current)
1120 save_access_regs(target->thread.acrs);
1121
1122 if (kbuf) {
1123 const compat_ulong_t *k = kbuf;
1124 while (count > 0 && !rc) {
1125 rc = __poke_user_compat(target, pos, *k++);
1126 count -= sizeof(*k);
1127 pos += sizeof(*k);
1128 }
1129 } else {
1130 const compat_ulong_t __user *u = ubuf;
1131 while (count > 0 && !rc) {
1132 compat_ulong_t word;
1133 rc = __get_user(word, u++);
1134 if (rc)
1135 break;
1136 rc = __poke_user_compat(target, pos, word);
1137 count -= sizeof(*u);
1138 pos += sizeof(*u);
1139 }
1140 }
1141
1142 if (rc == 0 && target == current)
1143 restore_access_regs(target->thread.acrs);
1144
1145 return rc;
1146}
1147
1148static int s390_compat_regs_high_get(struct task_struct *target,
1149 const struct user_regset *regset,
1150 unsigned int pos, unsigned int count,
1151 void *kbuf, void __user *ubuf)
1152{
1153 compat_ulong_t *gprs_high;
1154
1155 gprs_high = (compat_ulong_t *)
1156 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1157 if (kbuf) {
1158 compat_ulong_t *k = kbuf;
1159 while (count > 0) {
1160 *k++ = *gprs_high;
1161 gprs_high += 2;
1162 count -= sizeof(*k);
1163 }
1164 } else {
1165 compat_ulong_t __user *u = ubuf;
1166 while (count > 0) {
1167 if (__put_user(*gprs_high, u++))
1168 return -EFAULT;
1169 gprs_high += 2;
1170 count -= sizeof(*u);
1171 }
1172 }
1173 return 0;
1174}
1175
1176static int s390_compat_regs_high_set(struct task_struct *target,
1177 const struct user_regset *regset,
1178 unsigned int pos, unsigned int count,
1179 const void *kbuf, const void __user *ubuf)
1180{
1181 compat_ulong_t *gprs_high;
1182 int rc = 0;
1183
1184 gprs_high = (compat_ulong_t *)
1185 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1186 if (kbuf) {
1187 const compat_ulong_t *k = kbuf;
1188 while (count > 0) {
1189 *gprs_high = *k++;
1190 *gprs_high += 2;
1191 count -= sizeof(*k);
1192 }
1193 } else {
1194 const compat_ulong_t __user *u = ubuf;
1195 while (count > 0 && !rc) {
1196 unsigned long word;
1197 rc = __get_user(word, u++);
1198 if (rc)
1199 break;
1200 *gprs_high = word;
1201 *gprs_high += 2;
1202 count -= sizeof(*u);
1203 }
1204 }
1205
1206 return rc;
1207}
1208
1209static int s390_compat_last_break_get(struct task_struct *target,
1210 const struct user_regset *regset,
1211 unsigned int pos, unsigned int count,
1212 void *kbuf, void __user *ubuf)
1213{
1214 compat_ulong_t last_break;
1215
1216 if (count > 0) {
1217 last_break = task_thread_info(target)->last_break;
1218 if (kbuf) {
1219 unsigned long *k = kbuf;
1220 *k = last_break;
1221 } else {
1222 unsigned long __user *u = ubuf;
1223 if (__put_user(last_break, u))
1224 return -EFAULT;
1225 }
1226 }
1227 return 0;
1228}
1229
1230static int s390_compat_last_break_set(struct task_struct *target,
1231 const struct user_regset *regset,
1232 unsigned int pos, unsigned int count,
1233 const void *kbuf, const void __user *ubuf)
1234{
1235 return 0;
1236}
1237
1238static const struct user_regset s390_compat_regsets[] = {
1239 [REGSET_GENERAL] = {
1240 .core_note_type = NT_PRSTATUS,
1241 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1242 .size = sizeof(compat_long_t),
1243 .align = sizeof(compat_long_t),
1244 .get = s390_compat_regs_get,
1245 .set = s390_compat_regs_set,
1246 },
1247 [REGSET_FP] = {
1248 .core_note_type = NT_PRFPREG,
1249 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1250 .size = sizeof(compat_long_t),
1251 .align = sizeof(compat_long_t),
1252 .get = s390_fpregs_get,
1253 .set = s390_fpregs_set,
1254 },
1255 [REGSET_LAST_BREAK] = {
1256 .core_note_type = NT_S390_LAST_BREAK,
1257 .n = 1,
1258 .size = sizeof(long),
1259 .align = sizeof(long),
1260 .get = s390_compat_last_break_get,
1261 .set = s390_compat_last_break_set,
1262 },
1263 [REGSET_TDB] = {
1264 .core_note_type = NT_S390_TDB,
1265 .n = 1,
1266 .size = 256,
1267 .align = 1,
1268 .get = s390_tdb_get,
1269 .set = s390_tdb_set,
1270 },
1271 [REGSET_SYSTEM_CALL] = {
1272 .core_note_type = NT_S390_SYSTEM_CALL,
1273 .n = 1,
1274 .size = sizeof(compat_uint_t),
1275 .align = sizeof(compat_uint_t),
1276 .get = s390_system_call_get,
1277 .set = s390_system_call_set,
1278 },
1279 [REGSET_GENERAL_EXTENDED] = {
1280 .core_note_type = NT_S390_HIGH_GPRS,
1281 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1282 .size = sizeof(compat_long_t),
1283 .align = sizeof(compat_long_t),
1284 .get = s390_compat_regs_high_get,
1285 .set = s390_compat_regs_high_set,
1286 },
1287};
1288
1289static const struct user_regset_view user_s390_compat_view = {
1290 .name = "s390",
1291 .e_machine = EM_S390,
1292 .regsets = s390_compat_regsets,
1293 .n = ARRAY_SIZE(s390_compat_regsets)
1294};
1295#endif
1296
1297const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1298{
1299#ifdef CONFIG_COMPAT
1300 if (test_tsk_thread_flag(task, TIF_31BIT))
1301 return &user_s390_compat_view;
1302#endif
1303 return &user_s390_view;
1304}
1305
1306static const char *gpr_names[NUM_GPRS] = {
1307 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1308 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1309};
1310
1311unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1312{
1313 if (offset >= NUM_GPRS)
1314 return 0;
1315 return regs->gprs[offset];
1316}
1317
1318int regs_query_register_offset(const char *name)
1319{
1320 unsigned long offset;
1321
1322 if (!name || *name != 'r')
1323 return -EINVAL;
1324 if (kstrtoul(name + 1, 10, &offset))
1325 return -EINVAL;
1326 if (offset >= NUM_GPRS)
1327 return -EINVAL;
1328 return offset;
1329}
1330
1331const char *regs_query_register_name(unsigned int offset)
1332{
1333 if (offset >= NUM_GPRS)
1334 return NULL;
1335 return gpr_names[offset];
1336}
1337
1338static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1339{
1340 unsigned long ksp = kernel_stack_pointer(regs);
1341
1342 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1343}
1344
1345/**
1346 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1347 * @regs:pt_regs which contains kernel stack pointer.
1348 * @n:stack entry number.
1349 *
1350 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1351 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1352 * this returns 0.
1353 */
1354unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1355{
1356 unsigned long addr;
1357
1358 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1359 if (!regs_within_kernel_stack(regs, addr))
1360 return 0;
1361 return *(unsigned long *)addr;
1362}