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Linux/arch/s390/kernel/ptrace.c

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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 <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 
 41 enum 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 
 50 void update_per_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 cr0, cr0_new;
 60 
 61                 __ctl_store(cr0, 0, 0);
 62                 /* set or clear transaction execution bits 8 and 9. */
 63                 if (task->thread.per_flags & PER_FLAG_NO_TE)
 64                         cr0_new = cr0 & ~(3UL << 54);
 65                 else
 66                         cr0_new = cr0 | (3UL << 54);
 67                 /* Only load control register 0 if necessary. */
 68                 if (cr0 != cr0_new)
 69                         __ctl_load(cr0_new, 0, 0);
 70         }
 71 #endif
 72         /* Copy user specified PER registers */
 73         new.control = thread->per_user.control;
 74         new.start = thread->per_user.start;
 75         new.end = thread->per_user.end;
 76 
 77         /* merge TIF_SINGLE_STEP into user specified PER registers. */
 78         if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) {
 79                 new.control |= PER_EVENT_IFETCH;
 80 #ifdef CONFIG_64BIT
 81                 new.control |= PER_CONTROL_SUSPENSION;
 82                 new.control |= PER_EVENT_TRANSACTION_END;
 83 #endif
 84                 new.start = 0;
 85                 new.end = PSW_ADDR_INSN;
 86         }
 87 
 88         /* Take care of the PER enablement bit in the PSW. */
 89         if (!(new.control & PER_EVENT_MASK)) {
 90                 regs->psw.mask &= ~PSW_MASK_PER;
 91                 return;
 92         }
 93         regs->psw.mask |= PSW_MASK_PER;
 94         __ctl_store(old, 9, 11);
 95         if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
 96                 __ctl_load(new, 9, 11);
 97 }
 98 
 99 void user_enable_single_step(struct task_struct *task)
100 {
101         set_tsk_thread_flag(task, TIF_SINGLE_STEP);
102         if (task == current)
103                 update_per_regs(task);
104 }
105 
106 void user_disable_single_step(struct task_struct *task)
107 {
108         clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
109         if (task == current)
110                 update_per_regs(task);
111 }
112 
113 /*
114  * Called by kernel/ptrace.c when detaching..
115  *
116  * Clear all debugging related fields.
117  */
118 void ptrace_disable(struct task_struct *task)
119 {
120         memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
121         memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
122         clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
123         clear_tsk_thread_flag(task, TIF_PER_TRAP);
124         task->thread.per_flags = 0;
125 }
126 
127 #ifndef CONFIG_64BIT
128 # define __ADDR_MASK 3
129 #else
130 # define __ADDR_MASK 7
131 #endif
132 
133 static inline unsigned long __peek_user_per(struct task_struct *child,
134                                             addr_t addr)
135 {
136         struct per_struct_kernel *dummy = NULL;
137 
138         if (addr == (addr_t) &dummy->cr9)
139                 /* Control bits of the active per set. */
140                 return test_thread_flag(TIF_SINGLE_STEP) ?
141                         PER_EVENT_IFETCH : child->thread.per_user.control;
142         else if (addr == (addr_t) &dummy->cr10)
143                 /* Start address of the active per set. */
144                 return test_thread_flag(TIF_SINGLE_STEP) ?
145                         0 : child->thread.per_user.start;
146         else if (addr == (addr_t) &dummy->cr11)
147                 /* End address of the active per set. */
148                 return test_thread_flag(TIF_SINGLE_STEP) ?
149                         PSW_ADDR_INSN : child->thread.per_user.end;
150         else if (addr == (addr_t) &dummy->bits)
151                 /* Single-step bit. */
152                 return test_thread_flag(TIF_SINGLE_STEP) ?
153                         (1UL << (BITS_PER_LONG - 1)) : 0;
154         else if (addr == (addr_t) &dummy->starting_addr)
155                 /* Start address of the user specified per set. */
156                 return child->thread.per_user.start;
157         else if (addr == (addr_t) &dummy->ending_addr)
158                 /* End address of the user specified per set. */
159                 return child->thread.per_user.end;
160         else if (addr == (addr_t) &dummy->perc_atmid)
161                 /* PER code, ATMID and AI of the last PER trap */
162                 return (unsigned long)
163                         child->thread.per_event.cause << (BITS_PER_LONG - 16);
164         else if (addr == (addr_t) &dummy->address)
165                 /* Address of the last PER trap */
166                 return child->thread.per_event.address;
167         else if (addr == (addr_t) &dummy->access_id)
168                 /* Access id of the last PER trap */
169                 return (unsigned long)
170                         child->thread.per_event.paid << (BITS_PER_LONG - 8);
171         return 0;
172 }
173 
174 /*
175  * Read the word at offset addr from the user area of a process. The
176  * trouble here is that the information is littered over different
177  * locations. The process registers are found on the kernel stack,
178  * the floating point stuff and the trace settings are stored in
179  * the task structure. In addition the different structures in
180  * struct user contain pad bytes that should be read as zeroes.
181  * Lovely...
182  */
183 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
184 {
185         struct user *dummy = NULL;
186         addr_t offset, tmp;
187 
188         if (addr < (addr_t) &dummy->regs.acrs) {
189                 /*
190                  * psw and gprs are stored on the stack
191                  */
192                 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
193                 if (addr == (addr_t) &dummy->regs.psw.mask)
194                         /* Return a clean psw mask. */
195                         tmp = psw_user_bits | (tmp & PSW_MASK_USER);
196 
197         } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
198                 /*
199                  * access registers are stored in the thread structure
200                  */
201                 offset = addr - (addr_t) &dummy->regs.acrs;
202 #ifdef CONFIG_64BIT
203                 /*
204                  * Very special case: old & broken 64 bit gdb reading
205                  * from acrs[15]. Result is a 64 bit value. Read the
206                  * 32 bit acrs[15] value and shift it by 32. Sick...
207                  */
208                 if (addr == (addr_t) &dummy->regs.acrs[15])
209                         tmp = ((unsigned long) child->thread.acrs[15]) << 32;
210                 else
211 #endif
212                 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
213 
214         } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
215                 /*
216                  * orig_gpr2 is stored on the kernel stack
217                  */
218                 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
219 
220         } else if (addr < (addr_t) &dummy->regs.fp_regs) {
221                 /*
222                  * prevent reads of padding hole between
223                  * orig_gpr2 and fp_regs on s390.
224                  */
225                 tmp = 0;
226 
227         } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
228                 /* 
229                  * floating point regs. are stored in the thread structure
230                  */
231                 offset = addr - (addr_t) &dummy->regs.fp_regs;
232                 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
233                 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
234                         tmp &= (unsigned long) FPC_VALID_MASK
235                                 << (BITS_PER_LONG - 32);
236 
237         } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
238                 /*
239                  * Handle access to the per_info structure.
240                  */
241                 addr -= (addr_t) &dummy->regs.per_info;
242                 tmp = __peek_user_per(child, addr);
243 
244         } else
245                 tmp = 0;
246 
247         return tmp;
248 }
249 
250 static int
251 peek_user(struct task_struct *child, addr_t addr, addr_t data)
252 {
253         addr_t tmp, mask;
254 
255         /*
256          * Stupid gdb peeks/pokes the access registers in 64 bit with
257          * an alignment of 4. Programmers from hell...
258          */
259         mask = __ADDR_MASK;
260 #ifdef CONFIG_64BIT
261         if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
262             addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
263                 mask = 3;
264 #endif
265         if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
266                 return -EIO;
267 
268         tmp = __peek_user(child, addr);
269         return put_user(tmp, (addr_t __user *) data);
270 }
271 
272 static inline void __poke_user_per(struct task_struct *child,
273                                    addr_t addr, addr_t data)
274 {
275         struct per_struct_kernel *dummy = NULL;
276 
277         /*
278          * There are only three fields in the per_info struct that the
279          * debugger user can write to.
280          * 1) cr9: the debugger wants to set a new PER event mask
281          * 2) starting_addr: the debugger wants to set a new starting
282          *    address to use with the PER event mask.
283          * 3) ending_addr: the debugger wants to set a new ending
284          *    address to use with the PER event mask.
285          * The user specified PER event mask and the start and end
286          * addresses are used only if single stepping is not in effect.
287          * Writes to any other field in per_info are ignored.
288          */
289         if (addr == (addr_t) &dummy->cr9)
290                 /* PER event mask of the user specified per set. */
291                 child->thread.per_user.control =
292                         data & (PER_EVENT_MASK | PER_CONTROL_MASK);
293         else if (addr == (addr_t) &dummy->starting_addr)
294                 /* Starting address of the user specified per set. */
295                 child->thread.per_user.start = data;
296         else if (addr == (addr_t) &dummy->ending_addr)
297                 /* Ending address of the user specified per set. */
298                 child->thread.per_user.end = data;
299 }
300 
301 /*
302  * Write a word to the user area of a process at location addr. This
303  * operation does have an additional problem compared to peek_user.
304  * Stores to the program status word and on the floating point
305  * control register needs to get checked for validity.
306  */
307 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
308 {
309         struct user *dummy = NULL;
310         addr_t offset;
311 
312         if (addr < (addr_t) &dummy->regs.acrs) {
313                 /*
314                  * psw and gprs are stored on the stack
315                  */
316                 if (addr == (addr_t) &dummy->regs.psw.mask &&
317                     ((data & ~PSW_MASK_USER) != psw_user_bits ||
318                      ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))))
319                         /* Invalid psw mask. */
320                         return -EINVAL;
321                 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
322 
323         } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
324                 /*
325                  * access registers are stored in the thread structure
326                  */
327                 offset = addr - (addr_t) &dummy->regs.acrs;
328 #ifdef CONFIG_64BIT
329                 /*
330                  * Very special case: old & broken 64 bit gdb writing
331                  * to acrs[15] with a 64 bit value. Ignore the lower
332                  * half of the value and write the upper 32 bit to
333                  * acrs[15]. Sick...
334                  */
335                 if (addr == (addr_t) &dummy->regs.acrs[15])
336                         child->thread.acrs[15] = (unsigned int) (data >> 32);
337                 else
338 #endif
339                 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
340 
341         } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
342                 /*
343                  * orig_gpr2 is stored on the kernel stack
344                  */
345                 task_pt_regs(child)->orig_gpr2 = data;
346 
347         } else if (addr < (addr_t) &dummy->regs.fp_regs) {
348                 /*
349                  * prevent writes of padding hole between
350                  * orig_gpr2 and fp_regs on s390.
351                  */
352                 return 0;
353 
354         } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
355                 /*
356                  * floating point regs. are stored in the thread structure
357                  */
358                 if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
359                     (data & ~((unsigned long) FPC_VALID_MASK
360                               << (BITS_PER_LONG - 32))) != 0)
361                         return -EINVAL;
362                 offset = addr - (addr_t) &dummy->regs.fp_regs;
363                 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
364 
365         } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
366                 /*
367                  * Handle access to the per_info structure.
368                  */
369                 addr -= (addr_t) &dummy->regs.per_info;
370                 __poke_user_per(child, addr, data);
371 
372         }
373 
374         return 0;
375 }
376 
377 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
378 {
379         addr_t mask;
380 
381         /*
382          * Stupid gdb peeks/pokes the access registers in 64 bit with
383          * an alignment of 4. Programmers from hell indeed...
384          */
385         mask = __ADDR_MASK;
386 #ifdef CONFIG_64BIT
387         if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
388             addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
389                 mask = 3;
390 #endif
391         if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
392                 return -EIO;
393 
394         return __poke_user(child, addr, data);
395 }
396 
397 long arch_ptrace(struct task_struct *child, long request,
398                  unsigned long addr, unsigned long data)
399 {
400         ptrace_area parea; 
401         int copied, ret;
402 
403         switch (request) {
404         case PTRACE_PEEKUSR:
405                 /* read the word at location addr in the USER area. */
406                 return peek_user(child, addr, data);
407 
408         case PTRACE_POKEUSR:
409                 /* write the word at location addr in the USER area */
410                 return poke_user(child, addr, data);
411 
412         case PTRACE_PEEKUSR_AREA:
413         case PTRACE_POKEUSR_AREA:
414                 if (copy_from_user(&parea, (void __force __user *) addr,
415                                                         sizeof(parea)))
416                         return -EFAULT;
417                 addr = parea.kernel_addr;
418                 data = parea.process_addr;
419                 copied = 0;
420                 while (copied < parea.len) {
421                         if (request == PTRACE_PEEKUSR_AREA)
422                                 ret = peek_user(child, addr, data);
423                         else {
424                                 addr_t utmp;
425                                 if (get_user(utmp,
426                                              (addr_t __force __user *) data))
427                                         return -EFAULT;
428                                 ret = poke_user(child, addr, utmp);
429                         }
430                         if (ret)
431                                 return ret;
432                         addr += sizeof(unsigned long);
433                         data += sizeof(unsigned long);
434                         copied += sizeof(unsigned long);
435                 }
436                 return 0;
437         case PTRACE_GET_LAST_BREAK:
438                 put_user(task_thread_info(child)->last_break,
439                          (unsigned long __user *) data);
440                 return 0;
441         case PTRACE_ENABLE_TE:
442                 if (!MACHINE_HAS_TE)
443                         return -EIO;
444                 child->thread.per_flags &= ~PER_FLAG_NO_TE;
445                 return 0;
446         case PTRACE_DISABLE_TE:
447                 if (!MACHINE_HAS_TE)
448                         return -EIO;
449                 child->thread.per_flags |= PER_FLAG_NO_TE;
450                 return 0;
451         default:
452                 /* Removing high order bit from addr (only for 31 bit). */
453                 addr &= PSW_ADDR_INSN;
454                 return ptrace_request(child, request, addr, data);
455         }
456 }
457 
458 #ifdef CONFIG_COMPAT
459 /*
460  * Now the fun part starts... a 31 bit program running in the
461  * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
462  * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
463  * to handle, the difference to the 64 bit versions of the requests
464  * is that the access is done in multiples of 4 byte instead of
465  * 8 bytes (sizeof(unsigned long) on 31/64 bit).
466  * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
467  * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
468  * is a 31 bit program too, the content of struct user can be
469  * emulated. A 31 bit program peeking into the struct user of
470  * a 64 bit program is a no-no.
471  */
472 
473 /*
474  * Same as peek_user_per but for a 31 bit program.
475  */
476 static inline __u32 __peek_user_per_compat(struct task_struct *child,
477                                            addr_t addr)
478 {
479         struct compat_per_struct_kernel *dummy32 = NULL;
480 
481         if (addr == (addr_t) &dummy32->cr9)
482                 /* Control bits of the active per set. */
483                 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
484                         PER_EVENT_IFETCH : child->thread.per_user.control;
485         else if (addr == (addr_t) &dummy32->cr10)
486                 /* Start address of the active per set. */
487                 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
488                         0 : child->thread.per_user.start;
489         else if (addr == (addr_t) &dummy32->cr11)
490                 /* End address of the active per set. */
491                 return test_thread_flag(TIF_SINGLE_STEP) ?
492                         PSW32_ADDR_INSN : child->thread.per_user.end;
493         else if (addr == (addr_t) &dummy32->bits)
494                 /* Single-step bit. */
495                 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
496                         0x80000000 : 0;
497         else if (addr == (addr_t) &dummy32->starting_addr)
498                 /* Start address of the user specified per set. */
499                 return (__u32) child->thread.per_user.start;
500         else if (addr == (addr_t) &dummy32->ending_addr)
501                 /* End address of the user specified per set. */
502                 return (__u32) child->thread.per_user.end;
503         else if (addr == (addr_t) &dummy32->perc_atmid)
504                 /* PER code, ATMID and AI of the last PER trap */
505                 return (__u32) child->thread.per_event.cause << 16;
506         else if (addr == (addr_t) &dummy32->address)
507                 /* Address of the last PER trap */
508                 return (__u32) child->thread.per_event.address;
509         else if (addr == (addr_t) &dummy32->access_id)
510                 /* Access id of the last PER trap */
511                 return (__u32) child->thread.per_event.paid << 24;
512         return 0;
513 }
514 
515 /*
516  * Same as peek_user but for a 31 bit program.
517  */
518 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
519 {
520         struct compat_user *dummy32 = NULL;
521         addr_t offset;
522         __u32 tmp;
523 
524         if (addr < (addr_t) &dummy32->regs.acrs) {
525                 struct pt_regs *regs = task_pt_regs(child);
526                 /*
527                  * psw and gprs are stored on the stack
528                  */
529                 if (addr == (addr_t) &dummy32->regs.psw.mask) {
530                         /* Fake a 31 bit psw mask. */
531                         tmp = (__u32)(regs->psw.mask >> 32);
532                         tmp = psw32_user_bits | (tmp & PSW32_MASK_USER);
533                 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
534                         /* Fake a 31 bit psw address. */
535                         tmp = (__u32) regs->psw.addr |
536                                 (__u32)(regs->psw.mask & PSW_MASK_BA);
537                 } else {
538                         /* gpr 0-15 */
539                         tmp = *(__u32 *)((addr_t) &regs->psw + addr*2 + 4);
540                 }
541         } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
542                 /*
543                  * access registers are stored in the thread structure
544                  */
545                 offset = addr - (addr_t) &dummy32->regs.acrs;
546                 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
547 
548         } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
549                 /*
550                  * orig_gpr2 is stored on the kernel stack
551                  */
552                 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
553 
554         } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
555                 /*
556                  * prevent reads of padding hole between
557                  * orig_gpr2 and fp_regs on s390.
558                  */
559                 tmp = 0;
560 
561         } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
562                 /*
563                  * floating point regs. are stored in the thread structure 
564                  */
565                 offset = addr - (addr_t) &dummy32->regs.fp_regs;
566                 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
567 
568         } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
569                 /*
570                  * Handle access to the per_info structure.
571                  */
572                 addr -= (addr_t) &dummy32->regs.per_info;
573                 tmp = __peek_user_per_compat(child, addr);
574 
575         } else
576                 tmp = 0;
577 
578         return tmp;
579 }
580 
581 static int peek_user_compat(struct task_struct *child,
582                             addr_t addr, addr_t data)
583 {
584         __u32 tmp;
585 
586         if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
587                 return -EIO;
588 
589         tmp = __peek_user_compat(child, addr);
590         return put_user(tmp, (__u32 __user *) data);
591 }
592 
593 /*
594  * Same as poke_user_per but for a 31 bit program.
595  */
596 static inline void __poke_user_per_compat(struct task_struct *child,
597                                           addr_t addr, __u32 data)
598 {
599         struct compat_per_struct_kernel *dummy32 = NULL;
600 
601         if (addr == (addr_t) &dummy32->cr9)
602                 /* PER event mask of the user specified per set. */
603                 child->thread.per_user.control =
604                         data & (PER_EVENT_MASK | PER_CONTROL_MASK);
605         else if (addr == (addr_t) &dummy32->starting_addr)
606                 /* Starting address of the user specified per set. */
607                 child->thread.per_user.start = data;
608         else if (addr == (addr_t) &dummy32->ending_addr)
609                 /* Ending address of the user specified per set. */
610                 child->thread.per_user.end = data;
611 }
612 
613 /*
614  * Same as poke_user but for a 31 bit program.
615  */
616 static int __poke_user_compat(struct task_struct *child,
617                               addr_t addr, addr_t data)
618 {
619         struct compat_user *dummy32 = NULL;
620         __u32 tmp = (__u32) data;
621         addr_t offset;
622 
623         if (addr < (addr_t) &dummy32->regs.acrs) {
624                 struct pt_regs *regs = task_pt_regs(child);
625                 /*
626                  * psw, gprs, acrs and orig_gpr2 are stored on the stack
627                  */
628                 if (addr == (addr_t) &dummy32->regs.psw.mask) {
629                         /* Build a 64 bit psw mask from 31 bit mask. */
630                         if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits)
631                                 /* Invalid psw mask. */
632                                 return -EINVAL;
633                         regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
634                                 (regs->psw.mask & PSW_MASK_BA) |
635                                 (__u64)(tmp & PSW32_MASK_USER) << 32;
636                 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
637                         /* Build a 64 bit psw address from 31 bit address. */
638                         regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
639                         /* Transfer 31 bit amode bit to psw mask. */
640                         regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
641                                 (__u64)(tmp & PSW32_ADDR_AMODE);
642                 } else {
643                         /* gpr 0-15 */
644                         *(__u32*)((addr_t) &regs->psw + addr*2 + 4) = tmp;
645                 }
646         } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
647                 /*
648                  * access registers are stored in the thread structure
649                  */
650                 offset = addr - (addr_t) &dummy32->regs.acrs;
651                 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
652 
653         } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
654                 /*
655                  * orig_gpr2 is stored on the kernel stack
656                  */
657                 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
658 
659         } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
660                 /*
661                  * prevent writess of padding hole between
662                  * orig_gpr2 and fp_regs on s390.
663                  */
664                 return 0;
665 
666         } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
667                 /*
668                  * floating point regs. are stored in the thread structure 
669                  */
670                 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
671                     (tmp & ~FPC_VALID_MASK) != 0)
672                         /* Invalid floating point control. */
673                         return -EINVAL;
674                 offset = addr - (addr_t) &dummy32->regs.fp_regs;
675                 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
676 
677         } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
678                 /*
679                  * Handle access to the per_info structure.
680                  */
681                 addr -= (addr_t) &dummy32->regs.per_info;
682                 __poke_user_per_compat(child, addr, data);
683         }
684 
685         return 0;
686 }
687 
688 static int poke_user_compat(struct task_struct *child,
689                             addr_t addr, addr_t data)
690 {
691         if (!is_compat_task() || (addr & 3) ||
692             addr > sizeof(struct compat_user) - 3)
693                 return -EIO;
694 
695         return __poke_user_compat(child, addr, data);
696 }
697 
698 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
699                         compat_ulong_t caddr, compat_ulong_t cdata)
700 {
701         unsigned long addr = caddr;
702         unsigned long data = cdata;
703         compat_ptrace_area parea;
704         int copied, ret;
705 
706         switch (request) {
707         case PTRACE_PEEKUSR:
708                 /* read the word at location addr in the USER area. */
709                 return peek_user_compat(child, addr, data);
710 
711         case PTRACE_POKEUSR:
712                 /* write the word at location addr in the USER area */
713                 return poke_user_compat(child, addr, data);
714 
715         case PTRACE_PEEKUSR_AREA:
716         case PTRACE_POKEUSR_AREA:
717                 if (copy_from_user(&parea, (void __force __user *) addr,
718                                                         sizeof(parea)))
719                         return -EFAULT;
720                 addr = parea.kernel_addr;
721                 data = parea.process_addr;
722                 copied = 0;
723                 while (copied < parea.len) {
724                         if (request == PTRACE_PEEKUSR_AREA)
725                                 ret = peek_user_compat(child, addr, data);
726                         else {
727                                 __u32 utmp;
728                                 if (get_user(utmp,
729                                              (__u32 __force __user *) data))
730                                         return -EFAULT;
731                                 ret = poke_user_compat(child, addr, utmp);
732                         }
733                         if (ret)
734                                 return ret;
735                         addr += sizeof(unsigned int);
736                         data += sizeof(unsigned int);
737                         copied += sizeof(unsigned int);
738                 }
739                 return 0;
740         case PTRACE_GET_LAST_BREAK:
741                 put_user(task_thread_info(child)->last_break,
742                          (unsigned int __user *) data);
743                 return 0;
744         }
745         return compat_ptrace_request(child, request, addr, data);
746 }
747 #endif
748 
749 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
750 {
751         long ret = 0;
752 
753         /* Do the secure computing check first. */
754         if (secure_computing(regs->gprs[2])) {
755                 /* seccomp failures shouldn't expose any additional code. */
756                 ret = -1;
757                 goto out;
758         }
759 
760         /*
761          * The sysc_tracesys code in entry.S stored the system
762          * call number to gprs[2].
763          */
764         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
765             (tracehook_report_syscall_entry(regs) ||
766              regs->gprs[2] >= NR_syscalls)) {
767                 /*
768                  * Tracing decided this syscall should not happen or the
769                  * debugger stored an invalid system call number. Skip
770                  * the system call and the system call restart handling.
771                  */
772                 clear_thread_flag(TIF_SYSCALL);
773                 ret = -1;
774         }
775 
776         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
777                 trace_sys_enter(regs, regs->gprs[2]);
778 
779         audit_syscall_entry(is_compat_task() ?
780                                 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
781                             regs->gprs[2], regs->orig_gpr2,
782                             regs->gprs[3], regs->gprs[4],
783                             regs->gprs[5]);
784 out:
785         return ret ?: regs->gprs[2];
786 }
787 
788 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
789 {
790         audit_syscall_exit(regs);
791 
792         if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
793                 trace_sys_exit(regs, regs->gprs[2]);
794 
795         if (test_thread_flag(TIF_SYSCALL_TRACE))
796                 tracehook_report_syscall_exit(regs, 0);
797 }
798 
799 /*
800  * user_regset definitions.
801  */
802 
803 static int s390_regs_get(struct task_struct *target,
804                          const struct user_regset *regset,
805                          unsigned int pos, unsigned int count,
806                          void *kbuf, void __user *ubuf)
807 {
808         if (target == current)
809                 save_access_regs(target->thread.acrs);
810 
811         if (kbuf) {
812                 unsigned long *k = kbuf;
813                 while (count > 0) {
814                         *k++ = __peek_user(target, pos);
815                         count -= sizeof(*k);
816                         pos += sizeof(*k);
817                 }
818         } else {
819                 unsigned long __user *u = ubuf;
820                 while (count > 0) {
821                         if (__put_user(__peek_user(target, pos), u++))
822                                 return -EFAULT;
823                         count -= sizeof(*u);
824                         pos += sizeof(*u);
825                 }
826         }
827         return 0;
828 }
829 
830 static int s390_regs_set(struct task_struct *target,
831                          const struct user_regset *regset,
832                          unsigned int pos, unsigned int count,
833                          const void *kbuf, const void __user *ubuf)
834 {
835         int rc = 0;
836 
837         if (target == current)
838                 save_access_regs(target->thread.acrs);
839 
840         if (kbuf) {
841                 const unsigned long *k = kbuf;
842                 while (count > 0 && !rc) {
843                         rc = __poke_user(target, pos, *k++);
844                         count -= sizeof(*k);
845                         pos += sizeof(*k);
846                 }
847         } else {
848                 const unsigned long  __user *u = ubuf;
849                 while (count > 0 && !rc) {
850                         unsigned long word;
851                         rc = __get_user(word, u++);
852                         if (rc)
853                                 break;
854                         rc = __poke_user(target, pos, word);
855                         count -= sizeof(*u);
856                         pos += sizeof(*u);
857                 }
858         }
859 
860         if (rc == 0 && target == current)
861                 restore_access_regs(target->thread.acrs);
862 
863         return rc;
864 }
865 
866 static int s390_fpregs_get(struct task_struct *target,
867                            const struct user_regset *regset, unsigned int pos,
868                            unsigned int count, void *kbuf, void __user *ubuf)
869 {
870         if (target == current)
871                 save_fp_regs(&target->thread.fp_regs);
872 
873         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
874                                    &target->thread.fp_regs, 0, -1);
875 }
876 
877 static int s390_fpregs_set(struct task_struct *target,
878                            const struct user_regset *regset, unsigned int pos,
879                            unsigned int count, const void *kbuf,
880                            const void __user *ubuf)
881 {
882         int rc = 0;
883 
884         if (target == current)
885                 save_fp_regs(&target->thread.fp_regs);
886 
887         /* If setting FPC, must validate it first. */
888         if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
889                 u32 fpc[2] = { target->thread.fp_regs.fpc, 0 };
890                 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc,
891                                         0, offsetof(s390_fp_regs, fprs));
892                 if (rc)
893                         return rc;
894                 if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0)
895                         return -EINVAL;
896                 target->thread.fp_regs.fpc = fpc[0];
897         }
898 
899         if (rc == 0 && count > 0)
900                 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
901                                         target->thread.fp_regs.fprs,
902                                         offsetof(s390_fp_regs, fprs), -1);
903 
904         if (rc == 0 && target == current)
905                 restore_fp_regs(&target->thread.fp_regs);
906 
907         return rc;
908 }
909 
910 #ifdef CONFIG_64BIT
911 
912 static int s390_last_break_get(struct task_struct *target,
913                                const struct user_regset *regset,
914                                unsigned int pos, unsigned int count,
915                                void *kbuf, void __user *ubuf)
916 {
917         if (count > 0) {
918                 if (kbuf) {
919                         unsigned long *k = kbuf;
920                         *k = task_thread_info(target)->last_break;
921                 } else {
922                         unsigned long  __user *u = ubuf;
923                         if (__put_user(task_thread_info(target)->last_break, u))
924                                 return -EFAULT;
925                 }
926         }
927         return 0;
928 }
929 
930 static int s390_last_break_set(struct task_struct *target,
931                                const struct user_regset *regset,
932                                unsigned int pos, unsigned int count,
933                                const void *kbuf, const void __user *ubuf)
934 {
935         return 0;
936 }
937 
938 static int s390_tdb_get(struct task_struct *target,
939                         const struct user_regset *regset,
940                         unsigned int pos, unsigned int count,
941                         void *kbuf, void __user *ubuf)
942 {
943         struct pt_regs *regs = task_pt_regs(target);
944         unsigned char *data;
945 
946         if (!(regs->int_code & 0x200))
947                 return -ENODATA;
948         data = target->thread.trap_tdb;
949         return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
950 }
951 
952 static int s390_tdb_set(struct task_struct *target,
953                         const struct user_regset *regset,
954                         unsigned int pos, unsigned int count,
955                         const void *kbuf, const void __user *ubuf)
956 {
957         return 0;
958 }
959 
960 #endif
961 
962 static int s390_system_call_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         unsigned int *data = &task_thread_info(target)->system_call;
968         return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
969                                    data, 0, sizeof(unsigned int));
970 }
971 
972 static int s390_system_call_set(struct task_struct *target,
973                                 const struct user_regset *regset,
974                                 unsigned int pos, unsigned int count,
975                                 const void *kbuf, const void __user *ubuf)
976 {
977         unsigned int *data = &task_thread_info(target)->system_call;
978         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
979                                   data, 0, sizeof(unsigned int));
980 }
981 
982 static const struct user_regset s390_regsets[] = {
983         [REGSET_GENERAL] = {
984                 .core_note_type = NT_PRSTATUS,
985                 .n = sizeof(s390_regs) / sizeof(long),
986                 .size = sizeof(long),
987                 .align = sizeof(long),
988                 .get = s390_regs_get,
989                 .set = s390_regs_set,
990         },
991         [REGSET_FP] = {
992                 .core_note_type = NT_PRFPREG,
993                 .n = sizeof(s390_fp_regs) / sizeof(long),
994                 .size = sizeof(long),
995                 .align = sizeof(long),
996                 .get = s390_fpregs_get,
997                 .set = s390_fpregs_set,
998         },
999 #ifdef CONFIG_64BIT
1000         [REGSET_LAST_BREAK] = {
1001                 .core_note_type = NT_S390_LAST_BREAK,
1002                 .n = 1,
1003                 .size = sizeof(long),
1004                 .align = sizeof(long),
1005                 .get = s390_last_break_get,
1006                 .set = s390_last_break_set,
1007         },
1008         [REGSET_TDB] = {
1009                 .core_note_type = NT_S390_TDB,
1010                 .n = 1,
1011                 .size = 256,
1012                 .align = 1,
1013                 .get = s390_tdb_get,
1014                 .set = s390_tdb_set,
1015         },
1016 #endif
1017         [REGSET_SYSTEM_CALL] = {
1018                 .core_note_type = NT_S390_SYSTEM_CALL,
1019                 .n = 1,
1020                 .size = sizeof(unsigned int),
1021                 .align = sizeof(unsigned int),
1022                 .get = s390_system_call_get,
1023                 .set = s390_system_call_set,
1024         },
1025 };
1026 
1027 static const struct user_regset_view user_s390_view = {
1028         .name = UTS_MACHINE,
1029         .e_machine = EM_S390,
1030         .regsets = s390_regsets,
1031         .n = ARRAY_SIZE(s390_regsets)
1032 };
1033 
1034 #ifdef CONFIG_COMPAT
1035 static int s390_compat_regs_get(struct task_struct *target,
1036                                 const struct user_regset *regset,
1037                                 unsigned int pos, unsigned int count,
1038                                 void *kbuf, void __user *ubuf)
1039 {
1040         if (target == current)
1041                 save_access_regs(target->thread.acrs);
1042 
1043         if (kbuf) {
1044                 compat_ulong_t *k = kbuf;
1045                 while (count > 0) {
1046                         *k++ = __peek_user_compat(target, pos);
1047                         count -= sizeof(*k);
1048                         pos += sizeof(*k);
1049                 }
1050         } else {
1051                 compat_ulong_t __user *u = ubuf;
1052                 while (count > 0) {
1053                         if (__put_user(__peek_user_compat(target, pos), u++))
1054                                 return -EFAULT;
1055                         count -= sizeof(*u);
1056                         pos += sizeof(*u);
1057                 }
1058         }
1059         return 0;
1060 }
1061 
1062 static int s390_compat_regs_set(struct task_struct *target,
1063                                 const struct user_regset *regset,
1064                                 unsigned int pos, unsigned int count,
1065                                 const void *kbuf, const void __user *ubuf)
1066 {
1067         int rc = 0;
1068 
1069         if (target == current)
1070                 save_access_regs(target->thread.acrs);
1071 
1072         if (kbuf) {
1073                 const compat_ulong_t *k = kbuf;
1074                 while (count > 0 && !rc) {
1075                         rc = __poke_user_compat(target, pos, *k++);
1076                         count -= sizeof(*k);
1077                         pos += sizeof(*k);
1078                 }
1079         } else {
1080                 const compat_ulong_t  __user *u = ubuf;
1081                 while (count > 0 && !rc) {
1082                         compat_ulong_t word;
1083                         rc = __get_user(word, u++);
1084                         if (rc)
1085                                 break;
1086                         rc = __poke_user_compat(target, pos, word);
1087                         count -= sizeof(*u);
1088                         pos += sizeof(*u);
1089                 }
1090         }
1091 
1092         if (rc == 0 && target == current)
1093                 restore_access_regs(target->thread.acrs);
1094 
1095         return rc;
1096 }
1097 
1098 static int s390_compat_regs_high_get(struct task_struct *target,
1099                                      const struct user_regset *regset,
1100                                      unsigned int pos, unsigned int count,
1101                                      void *kbuf, void __user *ubuf)
1102 {
1103         compat_ulong_t *gprs_high;
1104 
1105         gprs_high = (compat_ulong_t *)
1106                 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1107         if (kbuf) {
1108                 compat_ulong_t *k = kbuf;
1109                 while (count > 0) {
1110                         *k++ = *gprs_high;
1111                         gprs_high += 2;
1112                         count -= sizeof(*k);
1113                 }
1114         } else {
1115                 compat_ulong_t __user *u = ubuf;
1116                 while (count > 0) {
1117                         if (__put_user(*gprs_high, u++))
1118                                 return -EFAULT;
1119                         gprs_high += 2;
1120                         count -= sizeof(*u);
1121                 }
1122         }
1123         return 0;
1124 }
1125 
1126 static int s390_compat_regs_high_set(struct task_struct *target,
1127                                      const struct user_regset *regset,
1128                                      unsigned int pos, unsigned int count,
1129                                      const void *kbuf, const void __user *ubuf)
1130 {
1131         compat_ulong_t *gprs_high;
1132         int rc = 0;
1133 
1134         gprs_high = (compat_ulong_t *)
1135                 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1136         if (kbuf) {
1137                 const compat_ulong_t *k = kbuf;
1138                 while (count > 0) {
1139                         *gprs_high = *k++;
1140                         *gprs_high += 2;
1141                         count -= sizeof(*k);
1142                 }
1143         } else {
1144                 const compat_ulong_t  __user *u = ubuf;
1145                 while (count > 0 && !rc) {
1146                         unsigned long word;
1147                         rc = __get_user(word, u++);
1148                         if (rc)
1149                                 break;
1150                         *gprs_high = word;
1151                         *gprs_high += 2;
1152                         count -= sizeof(*u);
1153                 }
1154         }
1155 
1156         return rc;
1157 }
1158 
1159 static int s390_compat_last_break_get(struct task_struct *target,
1160                                       const struct user_regset *regset,
1161                                       unsigned int pos, unsigned int count,
1162                                       void *kbuf, void __user *ubuf)
1163 {
1164         compat_ulong_t last_break;
1165 
1166         if (count > 0) {
1167                 last_break = task_thread_info(target)->last_break;
1168                 if (kbuf) {
1169                         unsigned long *k = kbuf;
1170                         *k = last_break;
1171                 } else {
1172                         unsigned long  __user *u = ubuf;
1173                         if (__put_user(last_break, u))
1174                                 return -EFAULT;
1175                 }
1176         }
1177         return 0;
1178 }
1179 
1180 static int s390_compat_last_break_set(struct task_struct *target,
1181                                       const struct user_regset *regset,
1182                                       unsigned int pos, unsigned int count,
1183                                       const void *kbuf, const void __user *ubuf)
1184 {
1185         return 0;
1186 }
1187 
1188 static const struct user_regset s390_compat_regsets[] = {
1189         [REGSET_GENERAL] = {
1190                 .core_note_type = NT_PRSTATUS,
1191                 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1192                 .size = sizeof(compat_long_t),
1193                 .align = sizeof(compat_long_t),
1194                 .get = s390_compat_regs_get,
1195                 .set = s390_compat_regs_set,
1196         },
1197         [REGSET_FP] = {
1198                 .core_note_type = NT_PRFPREG,
1199                 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1200                 .size = sizeof(compat_long_t),
1201                 .align = sizeof(compat_long_t),
1202                 .get = s390_fpregs_get,
1203                 .set = s390_fpregs_set,
1204         },
1205         [REGSET_LAST_BREAK] = {
1206                 .core_note_type = NT_S390_LAST_BREAK,
1207                 .n = 1,
1208                 .size = sizeof(long),
1209                 .align = sizeof(long),
1210                 .get = s390_compat_last_break_get,
1211                 .set = s390_compat_last_break_set,
1212         },
1213         [REGSET_TDB] = {
1214                 .core_note_type = NT_S390_TDB,
1215                 .n = 1,
1216                 .size = 256,
1217                 .align = 1,
1218                 .get = s390_tdb_get,
1219                 .set = s390_tdb_set,
1220         },
1221         [REGSET_SYSTEM_CALL] = {
1222                 .core_note_type = NT_S390_SYSTEM_CALL,
1223                 .n = 1,
1224                 .size = sizeof(compat_uint_t),
1225                 .align = sizeof(compat_uint_t),
1226                 .get = s390_system_call_get,
1227                 .set = s390_system_call_set,
1228         },
1229         [REGSET_GENERAL_EXTENDED] = {
1230                 .core_note_type = NT_S390_HIGH_GPRS,
1231                 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1232                 .size = sizeof(compat_long_t),
1233                 .align = sizeof(compat_long_t),
1234                 .get = s390_compat_regs_high_get,
1235                 .set = s390_compat_regs_high_set,
1236         },
1237 };
1238 
1239 static const struct user_regset_view user_s390_compat_view = {
1240         .name = "s390",
1241         .e_machine = EM_S390,
1242         .regsets = s390_compat_regsets,
1243         .n = ARRAY_SIZE(s390_compat_regsets)
1244 };
1245 #endif
1246 
1247 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1248 {
1249 #ifdef CONFIG_COMPAT
1250         if (test_tsk_thread_flag(task, TIF_31BIT))
1251                 return &user_s390_compat_view;
1252 #endif
1253         return &user_s390_view;
1254 }
1255 
1256 static const char *gpr_names[NUM_GPRS] = {
1257         "r0", "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
1258         "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1259 };
1260 
1261 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1262 {
1263         if (offset >= NUM_GPRS)
1264                 return 0;
1265         return regs->gprs[offset];
1266 }
1267 
1268 int regs_query_register_offset(const char *name)
1269 {
1270         unsigned long offset;
1271 
1272         if (!name || *name != 'r')
1273                 return -EINVAL;
1274         if (strict_strtoul(name + 1, 10, &offset))
1275                 return -EINVAL;
1276         if (offset >= NUM_GPRS)
1277                 return -EINVAL;
1278         return offset;
1279 }
1280 
1281 const char *regs_query_register_name(unsigned int offset)
1282 {
1283         if (offset >= NUM_GPRS)
1284                 return NULL;
1285         return gpr_names[offset];
1286 }
1287 
1288 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1289 {
1290         unsigned long ksp = kernel_stack_pointer(regs);
1291 
1292         return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1293 }
1294 
1295 /**
1296  * regs_get_kernel_stack_nth() - get Nth entry of the stack
1297  * @regs:pt_regs which contains kernel stack pointer.
1298  * @n:stack entry number.
1299  *
1300  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1301  * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1302  * this returns 0.
1303  */
1304 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1305 {
1306         unsigned long addr;
1307 
1308         addr = kernel_stack_pointer(regs) + n * sizeof(long);
1309         if (!regs_within_kernel_stack(regs, addr))
1310                 return 0;
1311         return *(unsigned long *)addr;
1312 }
1313 

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