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