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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Ptrace user space interface.
4 *
5 * Copyright IBM Corp. 1999, 2010
6 * Author(s): Denis Joseph Barrow
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 */
9
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/sched/task_stack.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/errno.h>
16#include <linux/ptrace.h>
17#include <linux/user.h>
18#include <linux/security.h>
19#include <linux/audit.h>
20#include <linux/signal.h>
21#include <linux/elf.h>
22#include <linux/regset.h>
23#include <linux/tracehook.h>
24#include <linux/seccomp.h>
25#include <linux/compat.h>
26#include <trace/syscall.h>
27#include <asm/page.h>
28#include <asm/pgtable.h>
29#include <asm/pgalloc.h>
30#include <linux/uaccess.h>
31#include <asm/unistd.h>
32#include <asm/switch_to.h>
33#include <asm/runtime_instr.h>
34#include <asm/facility.h>
35
36#include "entry.h"
37
38#ifdef CONFIG_COMPAT
39#include "compat_ptrace.h"
40#endif
41
42#define CREATE_TRACE_POINTS
43#include <trace/events/syscalls.h>
44
45void update_cr_regs(struct task_struct *task)
46{
47 struct pt_regs *regs = task_pt_regs(task);
48 struct thread_struct *thread = &task->thread;
49 struct per_regs old, new;
50 union ctlreg0 cr0_old, cr0_new;
51 union ctlreg2 cr2_old, cr2_new;
52 int cr0_changed, cr2_changed;
53
54 __ctl_store(cr0_old.val, 0, 0);
55 __ctl_store(cr2_old.val, 2, 2);
56 cr0_new = cr0_old;
57 cr2_new = cr2_old;
58 /* Take care of the enable/disable of transactional execution. */
59 if (MACHINE_HAS_TE) {
60 /* Set or clear transaction execution TXC bit 8. */
61 cr0_new.tcx = 1;
62 if (task->thread.per_flags & PER_FLAG_NO_TE)
63 cr0_new.tcx = 0;
64 /* Set or clear transaction execution TDC bits 62 and 63. */
65 cr2_new.tdc = 0;
66 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
67 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
68 cr2_new.tdc = 1;
69 else
70 cr2_new.tdc = 2;
71 }
72 }
73 /* Take care of enable/disable of guarded storage. */
74 if (MACHINE_HAS_GS) {
75 cr2_new.gse = 0;
76 if (task->thread.gs_cb)
77 cr2_new.gse = 1;
78 }
79 /* Load control register 0/2 iff changed */
80 cr0_changed = cr0_new.val != cr0_old.val;
81 cr2_changed = cr2_new.val != cr2_old.val;
82 if (cr0_changed)
83 __ctl_load(cr0_new.val, 0, 0);
84 if (cr2_changed)
85 __ctl_load(cr2_new.val, 2, 2);
86 /* Copy user specified PER registers */
87 new.control = thread->per_user.control;
88 new.start = thread->per_user.start;
89 new.end = thread->per_user.end;
90
91 /* merge TIF_SINGLE_STEP into user specified PER registers. */
92 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
93 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
94 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
95 new.control |= PER_EVENT_BRANCH;
96 else
97 new.control |= PER_EVENT_IFETCH;
98 new.control |= PER_CONTROL_SUSPENSION;
99 new.control |= PER_EVENT_TRANSACTION_END;
100 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
101 new.control |= PER_EVENT_IFETCH;
102 new.start = 0;
103 new.end = -1UL;
104 }
105
106 /* Take care of the PER enablement bit in the PSW. */
107 if (!(new.control & PER_EVENT_MASK)) {
108 regs->psw.mask &= ~PSW_MASK_PER;
109 return;
110 }
111 regs->psw.mask |= PSW_MASK_PER;
112 __ctl_store(old, 9, 11);
113 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
114 __ctl_load(new, 9, 11);
115}
116
117void user_enable_single_step(struct task_struct *task)
118{
119 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
120 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
121}
122
123void user_disable_single_step(struct task_struct *task)
124{
125 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
126 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
127}
128
129void user_enable_block_step(struct task_struct *task)
130{
131 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
132 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
133}
134
135/*
136 * Called by kernel/ptrace.c when detaching..
137 *
138 * Clear all debugging related fields.
139 */
140void ptrace_disable(struct task_struct *task)
141{
142 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
143 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
144 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
145 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
146 task->thread.per_flags = 0;
147}
148
149#define __ADDR_MASK 7
150
151static inline unsigned long __peek_user_per(struct task_struct *child,
152 addr_t addr)
153{
154 struct per_struct_kernel *dummy = NULL;
155
156 if (addr == (addr_t) &dummy->cr9)
157 /* Control bits of the active per set. */
158 return test_thread_flag(TIF_SINGLE_STEP) ?
159 PER_EVENT_IFETCH : child->thread.per_user.control;
160 else if (addr == (addr_t) &dummy->cr10)
161 /* Start address of the active per set. */
162 return test_thread_flag(TIF_SINGLE_STEP) ?
163 0 : child->thread.per_user.start;
164 else if (addr == (addr_t) &dummy->cr11)
165 /* End address of the active per set. */
166 return test_thread_flag(TIF_SINGLE_STEP) ?
167 -1UL : child->thread.per_user.end;
168 else if (addr == (addr_t) &dummy->bits)
169 /* Single-step bit. */
170 return test_thread_flag(TIF_SINGLE_STEP) ?
171 (1UL << (BITS_PER_LONG - 1)) : 0;
172 else if (addr == (addr_t) &dummy->starting_addr)
173 /* Start address of the user specified per set. */
174 return child->thread.per_user.start;
175 else if (addr == (addr_t) &dummy->ending_addr)
176 /* End address of the user specified per set. */
177 return child->thread.per_user.end;
178 else if (addr == (addr_t) &dummy->perc_atmid)
179 /* PER code, ATMID and AI of the last PER trap */
180 return (unsigned long)
181 child->thread.per_event.cause << (BITS_PER_LONG - 16);
182 else if (addr == (addr_t) &dummy->address)
183 /* Address of the last PER trap */
184 return child->thread.per_event.address;
185 else if (addr == (addr_t) &dummy->access_id)
186 /* Access id of the last PER trap */
187 return (unsigned long)
188 child->thread.per_event.paid << (BITS_PER_LONG - 8);
189 return 0;
190}
191
192/*
193 * Read the word at offset addr from the user area of a process. The
194 * trouble here is that the information is littered over different
195 * locations. The process registers are found on the kernel stack,
196 * the floating point stuff and the trace settings are stored in
197 * the task structure. In addition the different structures in
198 * struct user contain pad bytes that should be read as zeroes.
199 * Lovely...
200 */
201static unsigned long __peek_user(struct task_struct *child, addr_t addr)
202{
203 struct user *dummy = NULL;
204 addr_t offset, tmp;
205
206 if (addr < (addr_t) &dummy->regs.acrs) {
207 /*
208 * psw and gprs are stored on the stack
209 */
210 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
211 if (addr == (addr_t) &dummy->regs.psw.mask) {
212 /* Return a clean psw mask. */
213 tmp &= PSW_MASK_USER | PSW_MASK_RI;
214 tmp |= PSW_USER_BITS;
215 }
216
217 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
218 /*
219 * access registers are stored in the thread structure
220 */
221 offset = addr - (addr_t) &dummy->regs.acrs;
222 /*
223 * Very special case: old & broken 64 bit gdb reading
224 * from acrs[15]. Result is a 64 bit value. Read the
225 * 32 bit acrs[15] value and shift it by 32. Sick...
226 */
227 if (addr == (addr_t) &dummy->regs.acrs[15])
228 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
229 else
230 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
231
232 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
233 /*
234 * orig_gpr2 is stored on the kernel stack
235 */
236 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
237
238 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
239 /*
240 * prevent reads of padding hole between
241 * orig_gpr2 and fp_regs on s390.
242 */
243 tmp = 0;
244
245 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
246 /*
247 * floating point control reg. is in the thread structure
248 */
249 tmp = child->thread.fpu.fpc;
250 tmp <<= BITS_PER_LONG - 32;
251
252 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
253 /*
254 * floating point regs. are either in child->thread.fpu
255 * or the child->thread.fpu.vxrs array
256 */
257 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
258 if (MACHINE_HAS_VX)
259 tmp = *(addr_t *)
260 ((addr_t) child->thread.fpu.vxrs + 2*offset);
261 else
262 tmp = *(addr_t *)
263 ((addr_t) child->thread.fpu.fprs + offset);
264
265 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
266 /*
267 * Handle access to the per_info structure.
268 */
269 addr -= (addr_t) &dummy->regs.per_info;
270 tmp = __peek_user_per(child, addr);
271
272 } else
273 tmp = 0;
274
275 return tmp;
276}
277
278static int
279peek_user(struct task_struct *child, addr_t addr, addr_t data)
280{
281 addr_t tmp, mask;
282
283 /*
284 * Stupid gdb peeks/pokes the access registers in 64 bit with
285 * an alignment of 4. Programmers from hell...
286 */
287 mask = __ADDR_MASK;
288 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
289 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
290 mask = 3;
291 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
292 return -EIO;
293
294 tmp = __peek_user(child, addr);
295 return put_user(tmp, (addr_t __user *) data);
296}
297
298static inline void __poke_user_per(struct task_struct *child,
299 addr_t addr, addr_t data)
300{
301 struct per_struct_kernel *dummy = NULL;
302
303 /*
304 * There are only three fields in the per_info struct that the
305 * debugger user can write to.
306 * 1) cr9: the debugger wants to set a new PER event mask
307 * 2) starting_addr: the debugger wants to set a new starting
308 * address to use with the PER event mask.
309 * 3) ending_addr: the debugger wants to set a new ending
310 * address to use with the PER event mask.
311 * The user specified PER event mask and the start and end
312 * addresses are used only if single stepping is not in effect.
313 * Writes to any other field in per_info are ignored.
314 */
315 if (addr == (addr_t) &dummy->cr9)
316 /* PER event mask of the user specified per set. */
317 child->thread.per_user.control =
318 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
319 else if (addr == (addr_t) &dummy->starting_addr)
320 /* Starting address of the user specified per set. */
321 child->thread.per_user.start = data;
322 else if (addr == (addr_t) &dummy->ending_addr)
323 /* Ending address of the user specified per set. */
324 child->thread.per_user.end = data;
325}
326
327/*
328 * Write a word to the user area of a process at location addr. This
329 * operation does have an additional problem compared to peek_user.
330 * Stores to the program status word and on the floating point
331 * control register needs to get checked for validity.
332 */
333static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
334{
335 struct user *dummy = NULL;
336 addr_t offset;
337
338 if (addr < (addr_t) &dummy->regs.acrs) {
339 /*
340 * psw and gprs are stored on the stack
341 */
342 if (addr == (addr_t) &dummy->regs.psw.mask) {
343 unsigned long mask = PSW_MASK_USER;
344
345 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
346 if ((data ^ PSW_USER_BITS) & ~mask)
347 /* Invalid psw mask. */
348 return -EINVAL;
349 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
350 /* Invalid address-space-control bits */
351 return -EINVAL;
352 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
353 /* Invalid addressing mode bits */
354 return -EINVAL;
355 }
356 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
357
358 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
359 /*
360 * access registers are stored in the thread structure
361 */
362 offset = addr - (addr_t) &dummy->regs.acrs;
363 /*
364 * Very special case: old & broken 64 bit gdb writing
365 * to acrs[15] with a 64 bit value. Ignore the lower
366 * half of the value and write the upper 32 bit to
367 * acrs[15]. Sick...
368 */
369 if (addr == (addr_t) &dummy->regs.acrs[15])
370 child->thread.acrs[15] = (unsigned int) (data >> 32);
371 else
372 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
373
374 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
375 /*
376 * orig_gpr2 is stored on the kernel stack
377 */
378 task_pt_regs(child)->orig_gpr2 = data;
379
380 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
381 /*
382 * prevent writes of padding hole between
383 * orig_gpr2 and fp_regs on s390.
384 */
385 return 0;
386
387 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
388 /*
389 * floating point control reg. is in the thread structure
390 */
391 if ((unsigned int) data != 0 ||
392 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
393 return -EINVAL;
394 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
395
396 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
397 /*
398 * floating point regs. are either in child->thread.fpu
399 * or the child->thread.fpu.vxrs array
400 */
401 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
402 if (MACHINE_HAS_VX)
403 *(addr_t *)((addr_t)
404 child->thread.fpu.vxrs + 2*offset) = data;
405 else
406 *(addr_t *)((addr_t)
407 child->thread.fpu.fprs + offset) = data;
408
409 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
410 /*
411 * Handle access to the per_info structure.
412 */
413 addr -= (addr_t) &dummy->regs.per_info;
414 __poke_user_per(child, addr, data);
415
416 }
417
418 return 0;
419}
420
421static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
422{
423 addr_t mask;
424
425 /*
426 * Stupid gdb peeks/pokes the access registers in 64 bit with
427 * an alignment of 4. Programmers from hell indeed...
428 */
429 mask = __ADDR_MASK;
430 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
431 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
432 mask = 3;
433 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
434 return -EIO;
435
436 return __poke_user(child, addr, data);
437}
438
439long arch_ptrace(struct task_struct *child, long request,
440 unsigned long addr, unsigned long data)
441{
442 ptrace_area parea;
443 int copied, ret;
444
445 switch (request) {
446 case PTRACE_PEEKUSR:
447 /* read the word at location addr in the USER area. */
448 return peek_user(child, addr, data);
449
450 case PTRACE_POKEUSR:
451 /* write the word at location addr in the USER area */
452 return poke_user(child, addr, data);
453
454 case PTRACE_PEEKUSR_AREA:
455 case PTRACE_POKEUSR_AREA:
456 if (copy_from_user(&parea, (void __force __user *) addr,
457 sizeof(parea)))
458 return -EFAULT;
459 addr = parea.kernel_addr;
460 data = parea.process_addr;
461 copied = 0;
462 while (copied < parea.len) {
463 if (request == PTRACE_PEEKUSR_AREA)
464 ret = peek_user(child, addr, data);
465 else {
466 addr_t utmp;
467 if (get_user(utmp,
468 (addr_t __force __user *) data))
469 return -EFAULT;
470 ret = poke_user(child, addr, utmp);
471 }
472 if (ret)
473 return ret;
474 addr += sizeof(unsigned long);
475 data += sizeof(unsigned long);
476 copied += sizeof(unsigned long);
477 }
478 return 0;
479 case PTRACE_GET_LAST_BREAK:
480 put_user(child->thread.last_break,
481 (unsigned long __user *) data);
482 return 0;
483 case PTRACE_ENABLE_TE:
484 if (!MACHINE_HAS_TE)
485 return -EIO;
486 child->thread.per_flags &= ~PER_FLAG_NO_TE;
487 return 0;
488 case PTRACE_DISABLE_TE:
489 if (!MACHINE_HAS_TE)
490 return -EIO;
491 child->thread.per_flags |= PER_FLAG_NO_TE;
492 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
493 return 0;
494 case PTRACE_TE_ABORT_RAND:
495 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
496 return -EIO;
497 switch (data) {
498 case 0UL:
499 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
500 break;
501 case 1UL:
502 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
503 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
504 break;
505 case 2UL:
506 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
507 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
508 break;
509 default:
510 return -EINVAL;
511 }
512 return 0;
513 default:
514 return ptrace_request(child, request, addr, data);
515 }
516}
517
518#ifdef CONFIG_COMPAT
519/*
520 * Now the fun part starts... a 31 bit program running in the
521 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
522 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
523 * to handle, the difference to the 64 bit versions of the requests
524 * is that the access is done in multiples of 4 byte instead of
525 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
526 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
527 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
528 * is a 31 bit program too, the content of struct user can be
529 * emulated. A 31 bit program peeking into the struct user of
530 * a 64 bit program is a no-no.
531 */
532
533/*
534 * Same as peek_user_per but for a 31 bit program.
535 */
536static inline __u32 __peek_user_per_compat(struct task_struct *child,
537 addr_t addr)
538{
539 struct compat_per_struct_kernel *dummy32 = NULL;
540
541 if (addr == (addr_t) &dummy32->cr9)
542 /* Control bits of the active per set. */
543 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
544 PER_EVENT_IFETCH : child->thread.per_user.control;
545 else if (addr == (addr_t) &dummy32->cr10)
546 /* Start address of the active per set. */
547 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
548 0 : child->thread.per_user.start;
549 else if (addr == (addr_t) &dummy32->cr11)
550 /* End address of the active per set. */
551 return test_thread_flag(TIF_SINGLE_STEP) ?
552 PSW32_ADDR_INSN : child->thread.per_user.end;
553 else if (addr == (addr_t) &dummy32->bits)
554 /* Single-step bit. */
555 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
556 0x80000000 : 0;
557 else if (addr == (addr_t) &dummy32->starting_addr)
558 /* Start address of the user specified per set. */
559 return (__u32) child->thread.per_user.start;
560 else if (addr == (addr_t) &dummy32->ending_addr)
561 /* End address of the user specified per set. */
562 return (__u32) child->thread.per_user.end;
563 else if (addr == (addr_t) &dummy32->perc_atmid)
564 /* PER code, ATMID and AI of the last PER trap */
565 return (__u32) child->thread.per_event.cause << 16;
566 else if (addr == (addr_t) &dummy32->address)
567 /* Address of the last PER trap */
568 return (__u32) child->thread.per_event.address;
569 else if (addr == (addr_t) &dummy32->access_id)
570 /* Access id of the last PER trap */
571 return (__u32) child->thread.per_event.paid << 24;
572 return 0;
573}
574
575/*
576 * Same as peek_user but for a 31 bit program.
577 */
578static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
579{
580 struct compat_user *dummy32 = NULL;
581 addr_t offset;
582 __u32 tmp;
583
584 if (addr < (addr_t) &dummy32->regs.acrs) {
585 struct pt_regs *regs = task_pt_regs(child);
586 /*
587 * psw and gprs are stored on the stack
588 */
589 if (addr == (addr_t) &dummy32->regs.psw.mask) {
590 /* Fake a 31 bit psw mask. */
591 tmp = (__u32)(regs->psw.mask >> 32);
592 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
593 tmp |= PSW32_USER_BITS;
594 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
595 /* Fake a 31 bit psw address. */
596 tmp = (__u32) regs->psw.addr |
597 (__u32)(regs->psw.mask & PSW_MASK_BA);
598 } else {
599 /* gpr 0-15 */
600 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
601 }
602 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
603 /*
604 * access registers are stored in the thread structure
605 */
606 offset = addr - (addr_t) &dummy32->regs.acrs;
607 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
608
609 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
610 /*
611 * orig_gpr2 is stored on the kernel stack
612 */
613 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
614
615 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
616 /*
617 * prevent reads of padding hole between
618 * orig_gpr2 and fp_regs on s390.
619 */
620 tmp = 0;
621
622 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
623 /*
624 * floating point control reg. is in the thread structure
625 */
626 tmp = child->thread.fpu.fpc;
627
628 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
629 /*
630 * floating point regs. are either in child->thread.fpu
631 * or the child->thread.fpu.vxrs array
632 */
633 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
634 if (MACHINE_HAS_VX)
635 tmp = *(__u32 *)
636 ((addr_t) child->thread.fpu.vxrs + 2*offset);
637 else
638 tmp = *(__u32 *)
639 ((addr_t) child->thread.fpu.fprs + offset);
640
641 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
642 /*
643 * Handle access to the per_info structure.
644 */
645 addr -= (addr_t) &dummy32->regs.per_info;
646 tmp = __peek_user_per_compat(child, addr);
647
648 } else
649 tmp = 0;
650
651 return tmp;
652}
653
654static int peek_user_compat(struct task_struct *child,
655 addr_t addr, addr_t data)
656{
657 __u32 tmp;
658
659 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
660 return -EIO;
661
662 tmp = __peek_user_compat(child, addr);
663 return put_user(tmp, (__u32 __user *) data);
664}
665
666/*
667 * Same as poke_user_per but for a 31 bit program.
668 */
669static inline void __poke_user_per_compat(struct task_struct *child,
670 addr_t addr, __u32 data)
671{
672 struct compat_per_struct_kernel *dummy32 = NULL;
673
674 if (addr == (addr_t) &dummy32->cr9)
675 /* PER event mask of the user specified per set. */
676 child->thread.per_user.control =
677 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
678 else if (addr == (addr_t) &dummy32->starting_addr)
679 /* Starting address of the user specified per set. */
680 child->thread.per_user.start = data;
681 else if (addr == (addr_t) &dummy32->ending_addr)
682 /* Ending address of the user specified per set. */
683 child->thread.per_user.end = data;
684}
685
686/*
687 * Same as poke_user but for a 31 bit program.
688 */
689static int __poke_user_compat(struct task_struct *child,
690 addr_t addr, addr_t data)
691{
692 struct compat_user *dummy32 = NULL;
693 __u32 tmp = (__u32) data;
694 addr_t offset;
695
696 if (addr < (addr_t) &dummy32->regs.acrs) {
697 struct pt_regs *regs = task_pt_regs(child);
698 /*
699 * psw, gprs, acrs and orig_gpr2 are stored on the stack
700 */
701 if (addr == (addr_t) &dummy32->regs.psw.mask) {
702 __u32 mask = PSW32_MASK_USER;
703
704 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
705 /* Build a 64 bit psw mask from 31 bit mask. */
706 if ((tmp ^ PSW32_USER_BITS) & ~mask)
707 /* Invalid psw mask. */
708 return -EINVAL;
709 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
710 /* Invalid address-space-control bits */
711 return -EINVAL;
712 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
713 (regs->psw.mask & PSW_MASK_BA) |
714 (__u64)(tmp & mask) << 32;
715 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
716 /* Build a 64 bit psw address from 31 bit address. */
717 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
718 /* Transfer 31 bit amode bit to psw mask. */
719 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
720 (__u64)(tmp & PSW32_ADDR_AMODE);
721 } else {
722 /* gpr 0-15 */
723 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
724 }
725 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
726 /*
727 * access registers are stored in the thread structure
728 */
729 offset = addr - (addr_t) &dummy32->regs.acrs;
730 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
731
732 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
733 /*
734 * orig_gpr2 is stored on the kernel stack
735 */
736 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
737
738 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
739 /*
740 * prevent writess of padding hole between
741 * orig_gpr2 and fp_regs on s390.
742 */
743 return 0;
744
745 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
746 /*
747 * floating point control reg. is in the thread structure
748 */
749 if (test_fp_ctl(tmp))
750 return -EINVAL;
751 child->thread.fpu.fpc = data;
752
753 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
754 /*
755 * floating point regs. are either in child->thread.fpu
756 * or the child->thread.fpu.vxrs array
757 */
758 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
759 if (MACHINE_HAS_VX)
760 *(__u32 *)((addr_t)
761 child->thread.fpu.vxrs + 2*offset) = tmp;
762 else
763 *(__u32 *)((addr_t)
764 child->thread.fpu.fprs + offset) = tmp;
765
766 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
767 /*
768 * Handle access to the per_info structure.
769 */
770 addr -= (addr_t) &dummy32->regs.per_info;
771 __poke_user_per_compat(child, addr, data);
772 }
773
774 return 0;
775}
776
777static int poke_user_compat(struct task_struct *child,
778 addr_t addr, addr_t data)
779{
780 if (!is_compat_task() || (addr & 3) ||
781 addr > sizeof(struct compat_user) - 3)
782 return -EIO;
783
784 return __poke_user_compat(child, addr, data);
785}
786
787long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
788 compat_ulong_t caddr, compat_ulong_t cdata)
789{
790 unsigned long addr = caddr;
791 unsigned long data = cdata;
792 compat_ptrace_area parea;
793 int copied, ret;
794
795 switch (request) {
796 case PTRACE_PEEKUSR:
797 /* read the word at location addr in the USER area. */
798 return peek_user_compat(child, addr, data);
799
800 case PTRACE_POKEUSR:
801 /* write the word at location addr in the USER area */
802 return poke_user_compat(child, addr, data);
803
804 case PTRACE_PEEKUSR_AREA:
805 case PTRACE_POKEUSR_AREA:
806 if (copy_from_user(&parea, (void __force __user *) addr,
807 sizeof(parea)))
808 return -EFAULT;
809 addr = parea.kernel_addr;
810 data = parea.process_addr;
811 copied = 0;
812 while (copied < parea.len) {
813 if (request == PTRACE_PEEKUSR_AREA)
814 ret = peek_user_compat(child, addr, data);
815 else {
816 __u32 utmp;
817 if (get_user(utmp,
818 (__u32 __force __user *) data))
819 return -EFAULT;
820 ret = poke_user_compat(child, addr, utmp);
821 }
822 if (ret)
823 return ret;
824 addr += sizeof(unsigned int);
825 data += sizeof(unsigned int);
826 copied += sizeof(unsigned int);
827 }
828 return 0;
829 case PTRACE_GET_LAST_BREAK:
830 put_user(child->thread.last_break,
831 (unsigned int __user *) data);
832 return 0;
833 }
834 return compat_ptrace_request(child, request, addr, data);
835}
836#endif
837
838asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
839{
840 unsigned long mask = -1UL;
841
842 /*
843 * The sysc_tracesys code in entry.S stored the system
844 * call number to gprs[2].
845 */
846 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
847 (tracehook_report_syscall_entry(regs) ||
848 regs->gprs[2] >= NR_syscalls)) {
849 /*
850 * Tracing decided this syscall should not happen or the
851 * debugger stored an invalid system call number. Skip
852 * the system call and the system call restart handling.
853 */
854 clear_pt_regs_flag(regs, PIF_SYSCALL);
855 return -1;
856 }
857
858 /* Do the secure computing check after ptrace. */
859 if (secure_computing(NULL)) {
860 /* seccomp failures shouldn't expose any additional code. */
861 return -1;
862 }
863
864 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
865 trace_sys_enter(regs, regs->gprs[2]);
866
867 if (is_compat_task())
868 mask = 0xffffffff;
869
870 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask,
871 regs->gprs[3] &mask, regs->gprs[4] &mask,
872 regs->gprs[5] &mask);
873
874 return regs->gprs[2];
875}
876
877asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
878{
879 audit_syscall_exit(regs);
880
881 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
882 trace_sys_exit(regs, regs->gprs[2]);
883
884 if (test_thread_flag(TIF_SYSCALL_TRACE))
885 tracehook_report_syscall_exit(regs, 0);
886}
887
888/*
889 * user_regset definitions.
890 */
891
892static int s390_regs_get(struct task_struct *target,
893 const struct user_regset *regset,
894 unsigned int pos, unsigned int count,
895 void *kbuf, void __user *ubuf)
896{
897 if (target == current)
898 save_access_regs(target->thread.acrs);
899
900 if (kbuf) {
901 unsigned long *k = kbuf;
902 while (count > 0) {
903 *k++ = __peek_user(target, pos);
904 count -= sizeof(*k);
905 pos += sizeof(*k);
906 }
907 } else {
908 unsigned long __user *u = ubuf;
909 while (count > 0) {
910 if (__put_user(__peek_user(target, pos), u++))
911 return -EFAULT;
912 count -= sizeof(*u);
913 pos += sizeof(*u);
914 }
915 }
916 return 0;
917}
918
919static int s390_regs_set(struct task_struct *target,
920 const struct user_regset *regset,
921 unsigned int pos, unsigned int count,
922 const void *kbuf, const void __user *ubuf)
923{
924 int rc = 0;
925
926 if (target == current)
927 save_access_regs(target->thread.acrs);
928
929 if (kbuf) {
930 const unsigned long *k = kbuf;
931 while (count > 0 && !rc) {
932 rc = __poke_user(target, pos, *k++);
933 count -= sizeof(*k);
934 pos += sizeof(*k);
935 }
936 } else {
937 const unsigned long __user *u = ubuf;
938 while (count > 0 && !rc) {
939 unsigned long word;
940 rc = __get_user(word, u++);
941 if (rc)
942 break;
943 rc = __poke_user(target, pos, word);
944 count -= sizeof(*u);
945 pos += sizeof(*u);
946 }
947 }
948
949 if (rc == 0 && target == current)
950 restore_access_regs(target->thread.acrs);
951
952 return rc;
953}
954
955static int s390_fpregs_get(struct task_struct *target,
956 const struct user_regset *regset, unsigned int pos,
957 unsigned int count, void *kbuf, void __user *ubuf)
958{
959 _s390_fp_regs fp_regs;
960
961 if (target == current)
962 save_fpu_regs();
963
964 fp_regs.fpc = target->thread.fpu.fpc;
965 fpregs_store(&fp_regs, &target->thread.fpu);
966
967 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
968 &fp_regs, 0, -1);
969}
970
971static int s390_fpregs_set(struct task_struct *target,
972 const struct user_regset *regset, unsigned int pos,
973 unsigned int count, const void *kbuf,
974 const void __user *ubuf)
975{
976 int rc = 0;
977 freg_t fprs[__NUM_FPRS];
978
979 if (target == current)
980 save_fpu_regs();
981
982 if (MACHINE_HAS_VX)
983 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
984 else
985 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
986
987 /* If setting FPC, must validate it first. */
988 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
989 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
990 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
991 0, offsetof(s390_fp_regs, fprs));
992 if (rc)
993 return rc;
994 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
995 return -EINVAL;
996 target->thread.fpu.fpc = ufpc[0];
997 }
998
999 if (rc == 0 && count > 0)
1000 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1001 fprs, offsetof(s390_fp_regs, fprs), -1);
1002 if (rc)
1003 return rc;
1004
1005 if (MACHINE_HAS_VX)
1006 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
1007 else
1008 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
1009
1010 return rc;
1011}
1012
1013static int s390_last_break_get(struct task_struct *target,
1014 const struct user_regset *regset,
1015 unsigned int pos, unsigned int count,
1016 void *kbuf, void __user *ubuf)
1017{
1018 if (count > 0) {
1019 if (kbuf) {
1020 unsigned long *k = kbuf;
1021 *k = target->thread.last_break;
1022 } else {
1023 unsigned long __user *u = ubuf;
1024 if (__put_user(target->thread.last_break, u))
1025 return -EFAULT;
1026 }
1027 }
1028 return 0;
1029}
1030
1031static int s390_last_break_set(struct task_struct *target,
1032 const struct user_regset *regset,
1033 unsigned int pos, unsigned int count,
1034 const void *kbuf, const void __user *ubuf)
1035{
1036 return 0;
1037}
1038
1039static int s390_tdb_get(struct task_struct *target,
1040 const struct user_regset *regset,
1041 unsigned int pos, unsigned int count,
1042 void *kbuf, void __user *ubuf)
1043{
1044 struct pt_regs *regs = task_pt_regs(target);
1045 unsigned char *data;
1046
1047 if (!(regs->int_code & 0x200))
1048 return -ENODATA;
1049 data = target->thread.trap_tdb;
1050 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1051}
1052
1053static int s390_tdb_set(struct task_struct *target,
1054 const struct user_regset *regset,
1055 unsigned int pos, unsigned int count,
1056 const void *kbuf, const void __user *ubuf)
1057{
1058 return 0;
1059}
1060
1061static int s390_vxrs_low_get(struct task_struct *target,
1062 const struct user_regset *regset,
1063 unsigned int pos, unsigned int count,
1064 void *kbuf, void __user *ubuf)
1065{
1066 __u64 vxrs[__NUM_VXRS_LOW];
1067 int i;
1068
1069 if (!MACHINE_HAS_VX)
1070 return -ENODEV;
1071 if (target == current)
1072 save_fpu_regs();
1073 for (i = 0; i < __NUM_VXRS_LOW; i++)
1074 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1075 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1076}
1077
1078static int s390_vxrs_low_set(struct task_struct *target,
1079 const struct user_regset *regset,
1080 unsigned int pos, unsigned int count,
1081 const void *kbuf, const void __user *ubuf)
1082{
1083 __u64 vxrs[__NUM_VXRS_LOW];
1084 int i, rc;
1085
1086 if (!MACHINE_HAS_VX)
1087 return -ENODEV;
1088 if (target == current)
1089 save_fpu_regs();
1090
1091 for (i = 0; i < __NUM_VXRS_LOW; i++)
1092 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1093
1094 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1095 if (rc == 0)
1096 for (i = 0; i < __NUM_VXRS_LOW; i++)
1097 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1098
1099 return rc;
1100}
1101
1102static int s390_vxrs_high_get(struct task_struct *target,
1103 const struct user_regset *regset,
1104 unsigned int pos, unsigned int count,
1105 void *kbuf, void __user *ubuf)
1106{
1107 __vector128 vxrs[__NUM_VXRS_HIGH];
1108
1109 if (!MACHINE_HAS_VX)
1110 return -ENODEV;
1111 if (target == current)
1112 save_fpu_regs();
1113 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1114
1115 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1116}
1117
1118static int s390_vxrs_high_set(struct task_struct *target,
1119 const struct user_regset *regset,
1120 unsigned int pos, unsigned int count,
1121 const void *kbuf, const void __user *ubuf)
1122{
1123 int rc;
1124
1125 if (!MACHINE_HAS_VX)
1126 return -ENODEV;
1127 if (target == current)
1128 save_fpu_regs();
1129
1130 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1131 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1132 return rc;
1133}
1134
1135static int s390_system_call_get(struct task_struct *target,
1136 const struct user_regset *regset,
1137 unsigned int pos, unsigned int count,
1138 void *kbuf, void __user *ubuf)
1139{
1140 unsigned int *data = &target->thread.system_call;
1141 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1142 data, 0, sizeof(unsigned int));
1143}
1144
1145static int s390_system_call_set(struct task_struct *target,
1146 const struct user_regset *regset,
1147 unsigned int pos, unsigned int count,
1148 const void *kbuf, const void __user *ubuf)
1149{
1150 unsigned int *data = &target->thread.system_call;
1151 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1152 data, 0, sizeof(unsigned int));
1153}
1154
1155static int s390_gs_cb_get(struct task_struct *target,
1156 const struct user_regset *regset,
1157 unsigned int pos, unsigned int count,
1158 void *kbuf, void __user *ubuf)
1159{
1160 struct gs_cb *data = target->thread.gs_cb;
1161
1162 if (!MACHINE_HAS_GS)
1163 return -ENODEV;
1164 if (!data)
1165 return -ENODATA;
1166 if (target == current)
1167 save_gs_cb(data);
1168 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1169 data, 0, sizeof(struct gs_cb));
1170}
1171
1172static int s390_gs_cb_set(struct task_struct *target,
1173 const struct user_regset *regset,
1174 unsigned int pos, unsigned int count,
1175 const void *kbuf, const void __user *ubuf)
1176{
1177 struct gs_cb gs_cb = { }, *data = NULL;
1178 int rc;
1179
1180 if (!MACHINE_HAS_GS)
1181 return -ENODEV;
1182 if (!target->thread.gs_cb) {
1183 data = kzalloc(sizeof(*data), GFP_KERNEL);
1184 if (!data)
1185 return -ENOMEM;
1186 }
1187 if (!target->thread.gs_cb)
1188 gs_cb.gsd = 25;
1189 else if (target == current)
1190 save_gs_cb(&gs_cb);
1191 else
1192 gs_cb = *target->thread.gs_cb;
1193 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1194 &gs_cb, 0, sizeof(gs_cb));
1195 if (rc) {
1196 kfree(data);
1197 return -EFAULT;
1198 }
1199 preempt_disable();
1200 if (!target->thread.gs_cb)
1201 target->thread.gs_cb = data;
1202 *target->thread.gs_cb = gs_cb;
1203 if (target == current) {
1204 __ctl_set_bit(2, 4);
1205 restore_gs_cb(target->thread.gs_cb);
1206 }
1207 preempt_enable();
1208 return rc;
1209}
1210
1211static int s390_gs_bc_get(struct task_struct *target,
1212 const struct user_regset *regset,
1213 unsigned int pos, unsigned int count,
1214 void *kbuf, void __user *ubuf)
1215{
1216 struct gs_cb *data = target->thread.gs_bc_cb;
1217
1218 if (!MACHINE_HAS_GS)
1219 return -ENODEV;
1220 if (!data)
1221 return -ENODATA;
1222 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1223 data, 0, sizeof(struct gs_cb));
1224}
1225
1226static int s390_gs_bc_set(struct task_struct *target,
1227 const struct user_regset *regset,
1228 unsigned int pos, unsigned int count,
1229 const void *kbuf, const void __user *ubuf)
1230{
1231 struct gs_cb *data = target->thread.gs_bc_cb;
1232
1233 if (!MACHINE_HAS_GS)
1234 return -ENODEV;
1235 if (!data) {
1236 data = kzalloc(sizeof(*data), GFP_KERNEL);
1237 if (!data)
1238 return -ENOMEM;
1239 target->thread.gs_bc_cb = data;
1240 }
1241 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1242 data, 0, sizeof(struct gs_cb));
1243}
1244
1245static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
1246{
1247 return (cb->rca & 0x1f) == 0 &&
1248 (cb->roa & 0xfff) == 0 &&
1249 (cb->rla & 0xfff) == 0xfff &&
1250 cb->s == 1 &&
1251 cb->k == 1 &&
1252 cb->h == 0 &&
1253 cb->reserved1 == 0 &&
1254 cb->ps == 1 &&
1255 cb->qs == 0 &&
1256 cb->pc == 1 &&
1257 cb->qc == 0 &&
1258 cb->reserved2 == 0 &&
1259 cb->key == PAGE_DEFAULT_KEY &&
1260 cb->reserved3 == 0 &&
1261 cb->reserved4 == 0 &&
1262 cb->reserved5 == 0 &&
1263 cb->reserved6 == 0 &&
1264 cb->reserved7 == 0 &&
1265 cb->reserved8 == 0 &&
1266 cb->rla >= cb->roa &&
1267 cb->rca >= cb->roa &&
1268 cb->rca <= cb->rla+1 &&
1269 cb->m < 3;
1270}
1271
1272static int s390_runtime_instr_get(struct task_struct *target,
1273 const struct user_regset *regset,
1274 unsigned int pos, unsigned int count,
1275 void *kbuf, void __user *ubuf)
1276{
1277 struct runtime_instr_cb *data = target->thread.ri_cb;
1278
1279 if (!test_facility(64))
1280 return -ENODEV;
1281 if (!data)
1282 return -ENODATA;
1283
1284 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1285 data, 0, sizeof(struct runtime_instr_cb));
1286}
1287
1288static int s390_runtime_instr_set(struct task_struct *target,
1289 const struct user_regset *regset,
1290 unsigned int pos, unsigned int count,
1291 const void *kbuf, const void __user *ubuf)
1292{
1293 struct runtime_instr_cb ri_cb = { }, *data = NULL;
1294 int rc;
1295
1296 if (!test_facility(64))
1297 return -ENODEV;
1298
1299 if (!target->thread.ri_cb) {
1300 data = kzalloc(sizeof(*data), GFP_KERNEL);
1301 if (!data)
1302 return -ENOMEM;
1303 }
1304
1305 if (target->thread.ri_cb) {
1306 if (target == current)
1307 store_runtime_instr_cb(&ri_cb);
1308 else
1309 ri_cb = *target->thread.ri_cb;
1310 }
1311
1312 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1313 &ri_cb, 0, sizeof(struct runtime_instr_cb));
1314 if (rc) {
1315 kfree(data);
1316 return -EFAULT;
1317 }
1318
1319 if (!is_ri_cb_valid(&ri_cb)) {
1320 kfree(data);
1321 return -EINVAL;
1322 }
1323
1324 preempt_disable();
1325 if (!target->thread.ri_cb)
1326 target->thread.ri_cb = data;
1327 *target->thread.ri_cb = ri_cb;
1328 if (target == current)
1329 load_runtime_instr_cb(target->thread.ri_cb);
1330 preempt_enable();
1331
1332 return 0;
1333}
1334
1335static const struct user_regset s390_regsets[] = {
1336 {
1337 .core_note_type = NT_PRSTATUS,
1338 .n = sizeof(s390_regs) / sizeof(long),
1339 .size = sizeof(long),
1340 .align = sizeof(long),
1341 .get = s390_regs_get,
1342 .set = s390_regs_set,
1343 },
1344 {
1345 .core_note_type = NT_PRFPREG,
1346 .n = sizeof(s390_fp_regs) / sizeof(long),
1347 .size = sizeof(long),
1348 .align = sizeof(long),
1349 .get = s390_fpregs_get,
1350 .set = s390_fpregs_set,
1351 },
1352 {
1353 .core_note_type = NT_S390_SYSTEM_CALL,
1354 .n = 1,
1355 .size = sizeof(unsigned int),
1356 .align = sizeof(unsigned int),
1357 .get = s390_system_call_get,
1358 .set = s390_system_call_set,
1359 },
1360 {
1361 .core_note_type = NT_S390_LAST_BREAK,
1362 .n = 1,
1363 .size = sizeof(long),
1364 .align = sizeof(long),
1365 .get = s390_last_break_get,
1366 .set = s390_last_break_set,
1367 },
1368 {
1369 .core_note_type = NT_S390_TDB,
1370 .n = 1,
1371 .size = 256,
1372 .align = 1,
1373 .get = s390_tdb_get,
1374 .set = s390_tdb_set,
1375 },
1376 {
1377 .core_note_type = NT_S390_VXRS_LOW,
1378 .n = __NUM_VXRS_LOW,
1379 .size = sizeof(__u64),
1380 .align = sizeof(__u64),
1381 .get = s390_vxrs_low_get,
1382 .set = s390_vxrs_low_set,
1383 },
1384 {
1385 .core_note_type = NT_S390_VXRS_HIGH,
1386 .n = __NUM_VXRS_HIGH,
1387 .size = sizeof(__vector128),
1388 .align = sizeof(__vector128),
1389 .get = s390_vxrs_high_get,
1390 .set = s390_vxrs_high_set,
1391 },
1392 {
1393 .core_note_type = NT_S390_GS_CB,
1394 .n = sizeof(struct gs_cb) / sizeof(__u64),
1395 .size = sizeof(__u64),
1396 .align = sizeof(__u64),
1397 .get = s390_gs_cb_get,
1398 .set = s390_gs_cb_set,
1399 },
1400 {
1401 .core_note_type = NT_S390_GS_BC,
1402 .n = sizeof(struct gs_cb) / sizeof(__u64),
1403 .size = sizeof(__u64),
1404 .align = sizeof(__u64),
1405 .get = s390_gs_bc_get,
1406 .set = s390_gs_bc_set,
1407 },
1408 {
1409 .core_note_type = NT_S390_RI_CB,
1410 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1411 .size = sizeof(__u64),
1412 .align = sizeof(__u64),
1413 .get = s390_runtime_instr_get,
1414 .set = s390_runtime_instr_set,
1415 },
1416};
1417
1418static const struct user_regset_view user_s390_view = {
1419 .name = UTS_MACHINE,
1420 .e_machine = EM_S390,
1421 .regsets = s390_regsets,
1422 .n = ARRAY_SIZE(s390_regsets)
1423};
1424
1425#ifdef CONFIG_COMPAT
1426static int s390_compat_regs_get(struct task_struct *target,
1427 const struct user_regset *regset,
1428 unsigned int pos, unsigned int count,
1429 void *kbuf, void __user *ubuf)
1430{
1431 if (target == current)
1432 save_access_regs(target->thread.acrs);
1433
1434 if (kbuf) {
1435 compat_ulong_t *k = kbuf;
1436 while (count > 0) {
1437 *k++ = __peek_user_compat(target, pos);
1438 count -= sizeof(*k);
1439 pos += sizeof(*k);
1440 }
1441 } else {
1442 compat_ulong_t __user *u = ubuf;
1443 while (count > 0) {
1444 if (__put_user(__peek_user_compat(target, pos), u++))
1445 return -EFAULT;
1446 count -= sizeof(*u);
1447 pos += sizeof(*u);
1448 }
1449 }
1450 return 0;
1451}
1452
1453static int s390_compat_regs_set(struct task_struct *target,
1454 const struct user_regset *regset,
1455 unsigned int pos, unsigned int count,
1456 const void *kbuf, const void __user *ubuf)
1457{
1458 int rc = 0;
1459
1460 if (target == current)
1461 save_access_regs(target->thread.acrs);
1462
1463 if (kbuf) {
1464 const compat_ulong_t *k = kbuf;
1465 while (count > 0 && !rc) {
1466 rc = __poke_user_compat(target, pos, *k++);
1467 count -= sizeof(*k);
1468 pos += sizeof(*k);
1469 }
1470 } else {
1471 const compat_ulong_t __user *u = ubuf;
1472 while (count > 0 && !rc) {
1473 compat_ulong_t word;
1474 rc = __get_user(word, u++);
1475 if (rc)
1476 break;
1477 rc = __poke_user_compat(target, pos, word);
1478 count -= sizeof(*u);
1479 pos += sizeof(*u);
1480 }
1481 }
1482
1483 if (rc == 0 && target == current)
1484 restore_access_regs(target->thread.acrs);
1485
1486 return rc;
1487}
1488
1489static int s390_compat_regs_high_get(struct task_struct *target,
1490 const struct user_regset *regset,
1491 unsigned int pos, unsigned int count,
1492 void *kbuf, void __user *ubuf)
1493{
1494 compat_ulong_t *gprs_high;
1495
1496 gprs_high = (compat_ulong_t *)
1497 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1498 if (kbuf) {
1499 compat_ulong_t *k = kbuf;
1500 while (count > 0) {
1501 *k++ = *gprs_high;
1502 gprs_high += 2;
1503 count -= sizeof(*k);
1504 }
1505 } else {
1506 compat_ulong_t __user *u = ubuf;
1507 while (count > 0) {
1508 if (__put_user(*gprs_high, u++))
1509 return -EFAULT;
1510 gprs_high += 2;
1511 count -= sizeof(*u);
1512 }
1513 }
1514 return 0;
1515}
1516
1517static int s390_compat_regs_high_set(struct task_struct *target,
1518 const struct user_regset *regset,
1519 unsigned int pos, unsigned int count,
1520 const void *kbuf, const void __user *ubuf)
1521{
1522 compat_ulong_t *gprs_high;
1523 int rc = 0;
1524
1525 gprs_high = (compat_ulong_t *)
1526 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1527 if (kbuf) {
1528 const compat_ulong_t *k = kbuf;
1529 while (count > 0) {
1530 *gprs_high = *k++;
1531 *gprs_high += 2;
1532 count -= sizeof(*k);
1533 }
1534 } else {
1535 const compat_ulong_t __user *u = ubuf;
1536 while (count > 0 && !rc) {
1537 unsigned long word;
1538 rc = __get_user(word, u++);
1539 if (rc)
1540 break;
1541 *gprs_high = word;
1542 *gprs_high += 2;
1543 count -= sizeof(*u);
1544 }
1545 }
1546
1547 return rc;
1548}
1549
1550static int s390_compat_last_break_get(struct task_struct *target,
1551 const struct user_regset *regset,
1552 unsigned int pos, unsigned int count,
1553 void *kbuf, void __user *ubuf)
1554{
1555 compat_ulong_t last_break;
1556
1557 if (count > 0) {
1558 last_break = target->thread.last_break;
1559 if (kbuf) {
1560 unsigned long *k = kbuf;
1561 *k = last_break;
1562 } else {
1563 unsigned long __user *u = ubuf;
1564 if (__put_user(last_break, u))
1565 return -EFAULT;
1566 }
1567 }
1568 return 0;
1569}
1570
1571static int s390_compat_last_break_set(struct task_struct *target,
1572 const struct user_regset *regset,
1573 unsigned int pos, unsigned int count,
1574 const void *kbuf, const void __user *ubuf)
1575{
1576 return 0;
1577}
1578
1579static const struct user_regset s390_compat_regsets[] = {
1580 {
1581 .core_note_type = NT_PRSTATUS,
1582 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1583 .size = sizeof(compat_long_t),
1584 .align = sizeof(compat_long_t),
1585 .get = s390_compat_regs_get,
1586 .set = s390_compat_regs_set,
1587 },
1588 {
1589 .core_note_type = NT_PRFPREG,
1590 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1591 .size = sizeof(compat_long_t),
1592 .align = sizeof(compat_long_t),
1593 .get = s390_fpregs_get,
1594 .set = s390_fpregs_set,
1595 },
1596 {
1597 .core_note_type = NT_S390_SYSTEM_CALL,
1598 .n = 1,
1599 .size = sizeof(compat_uint_t),
1600 .align = sizeof(compat_uint_t),
1601 .get = s390_system_call_get,
1602 .set = s390_system_call_set,
1603 },
1604 {
1605 .core_note_type = NT_S390_LAST_BREAK,
1606 .n = 1,
1607 .size = sizeof(long),
1608 .align = sizeof(long),
1609 .get = s390_compat_last_break_get,
1610 .set = s390_compat_last_break_set,
1611 },
1612 {
1613 .core_note_type = NT_S390_TDB,
1614 .n = 1,
1615 .size = 256,
1616 .align = 1,
1617 .get = s390_tdb_get,
1618 .set = s390_tdb_set,
1619 },
1620 {
1621 .core_note_type = NT_S390_VXRS_LOW,
1622 .n = __NUM_VXRS_LOW,
1623 .size = sizeof(__u64),
1624 .align = sizeof(__u64),
1625 .get = s390_vxrs_low_get,
1626 .set = s390_vxrs_low_set,
1627 },
1628 {
1629 .core_note_type = NT_S390_VXRS_HIGH,
1630 .n = __NUM_VXRS_HIGH,
1631 .size = sizeof(__vector128),
1632 .align = sizeof(__vector128),
1633 .get = s390_vxrs_high_get,
1634 .set = s390_vxrs_high_set,
1635 },
1636 {
1637 .core_note_type = NT_S390_HIGH_GPRS,
1638 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1639 .size = sizeof(compat_long_t),
1640 .align = sizeof(compat_long_t),
1641 .get = s390_compat_regs_high_get,
1642 .set = s390_compat_regs_high_set,
1643 },
1644 {
1645 .core_note_type = NT_S390_GS_CB,
1646 .n = sizeof(struct gs_cb) / sizeof(__u64),
1647 .size = sizeof(__u64),
1648 .align = sizeof(__u64),
1649 .get = s390_gs_cb_get,
1650 .set = s390_gs_cb_set,
1651 },
1652 {
1653 .core_note_type = NT_S390_GS_BC,
1654 .n = sizeof(struct gs_cb) / sizeof(__u64),
1655 .size = sizeof(__u64),
1656 .align = sizeof(__u64),
1657 .get = s390_gs_bc_get,
1658 .set = s390_gs_bc_set,
1659 },
1660 {
1661 .core_note_type = NT_S390_RI_CB,
1662 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1663 .size = sizeof(__u64),
1664 .align = sizeof(__u64),
1665 .get = s390_runtime_instr_get,
1666 .set = s390_runtime_instr_set,
1667 },
1668};
1669
1670static const struct user_regset_view user_s390_compat_view = {
1671 .name = "s390",
1672 .e_machine = EM_S390,
1673 .regsets = s390_compat_regsets,
1674 .n = ARRAY_SIZE(s390_compat_regsets)
1675};
1676#endif
1677
1678const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1679{
1680#ifdef CONFIG_COMPAT
1681 if (test_tsk_thread_flag(task, TIF_31BIT))
1682 return &user_s390_compat_view;
1683#endif
1684 return &user_s390_view;
1685}
1686
1687static const char *gpr_names[NUM_GPRS] = {
1688 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1689 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1690};
1691
1692unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1693{
1694 if (offset >= NUM_GPRS)
1695 return 0;
1696 return regs->gprs[offset];
1697}
1698
1699int regs_query_register_offset(const char *name)
1700{
1701 unsigned long offset;
1702
1703 if (!name || *name != 'r')
1704 return -EINVAL;
1705 if (kstrtoul(name + 1, 10, &offset))
1706 return -EINVAL;
1707 if (offset >= NUM_GPRS)
1708 return -EINVAL;
1709 return offset;
1710}
1711
1712const char *regs_query_register_name(unsigned int offset)
1713{
1714 if (offset >= NUM_GPRS)
1715 return NULL;
1716 return gpr_names[offset];
1717}
1718
1719static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1720{
1721 unsigned long ksp = kernel_stack_pointer(regs);
1722
1723 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1724}
1725
1726/**
1727 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1728 * @regs:pt_regs which contains kernel stack pointer.
1729 * @n:stack entry number.
1730 *
1731 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1732 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1733 * this returns 0.
1734 */
1735unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1736{
1737 unsigned long addr;
1738
1739 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1740 if (!regs_within_kernel_stack(regs, addr))
1741 return 0;
1742 return *(unsigned long *)addr;
1743}
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 <linux/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
41void update_cr_regs(struct task_struct *task)
42{
43 struct pt_regs *regs = task_pt_regs(task);
44 struct thread_struct *thread = &task->thread;
45 struct per_regs old, new;
46
47 /* Take care of the enable/disable of transactional execution. */
48 if (MACHINE_HAS_TE) {
49 unsigned long cr, cr_new;
50
51 __ctl_store(cr, 0, 0);
52 /* Set or clear transaction execution TXC bit 8. */
53 cr_new = cr | (1UL << 55);
54 if (task->thread.per_flags & PER_FLAG_NO_TE)
55 cr_new &= ~(1UL << 55);
56 if (cr_new != cr)
57 __ctl_load(cr_new, 0, 0);
58 /* Set or clear transaction execution TDC bits 62 and 63. */
59 __ctl_store(cr, 2, 2);
60 cr_new = cr & ~3UL;
61 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
62 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
63 cr_new |= 1UL;
64 else
65 cr_new |= 2UL;
66 }
67 if (cr_new != cr)
68 __ctl_load(cr_new, 2, 2);
69 }
70 /* Copy user specified PER registers */
71 new.control = thread->per_user.control;
72 new.start = thread->per_user.start;
73 new.end = thread->per_user.end;
74
75 /* merge TIF_SINGLE_STEP into user specified PER registers. */
76 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
77 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
78 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
79 new.control |= PER_EVENT_BRANCH;
80 else
81 new.control |= PER_EVENT_IFETCH;
82 new.control |= PER_CONTROL_SUSPENSION;
83 new.control |= PER_EVENT_TRANSACTION_END;
84 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
85 new.control |= PER_EVENT_IFETCH;
86 new.start = 0;
87 new.end = -1UL;
88 }
89
90 /* Take care of the PER enablement bit in the PSW. */
91 if (!(new.control & PER_EVENT_MASK)) {
92 regs->psw.mask &= ~PSW_MASK_PER;
93 return;
94 }
95 regs->psw.mask |= PSW_MASK_PER;
96 __ctl_store(old, 9, 11);
97 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
98 __ctl_load(new, 9, 11);
99}
100
101void user_enable_single_step(struct task_struct *task)
102{
103 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
104 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
105}
106
107void user_disable_single_step(struct task_struct *task)
108{
109 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
110 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
111}
112
113void user_enable_block_step(struct task_struct *task)
114{
115 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
116 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
117}
118
119/*
120 * Called by kernel/ptrace.c when detaching..
121 *
122 * Clear all debugging related fields.
123 */
124void ptrace_disable(struct task_struct *task)
125{
126 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
127 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
128 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
129 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
130 task->thread.per_flags = 0;
131}
132
133#define __ADDR_MASK 7
134
135static inline unsigned long __peek_user_per(struct task_struct *child,
136 addr_t addr)
137{
138 struct per_struct_kernel *dummy = NULL;
139
140 if (addr == (addr_t) &dummy->cr9)
141 /* Control bits of the active per set. */
142 return test_thread_flag(TIF_SINGLE_STEP) ?
143 PER_EVENT_IFETCH : child->thread.per_user.control;
144 else if (addr == (addr_t) &dummy->cr10)
145 /* Start address of the active per set. */
146 return test_thread_flag(TIF_SINGLE_STEP) ?
147 0 : child->thread.per_user.start;
148 else if (addr == (addr_t) &dummy->cr11)
149 /* End address of the active per set. */
150 return test_thread_flag(TIF_SINGLE_STEP) ?
151 -1UL : child->thread.per_user.end;
152 else if (addr == (addr_t) &dummy->bits)
153 /* Single-step bit. */
154 return test_thread_flag(TIF_SINGLE_STEP) ?
155 (1UL << (BITS_PER_LONG - 1)) : 0;
156 else if (addr == (addr_t) &dummy->starting_addr)
157 /* Start address of the user specified per set. */
158 return child->thread.per_user.start;
159 else if (addr == (addr_t) &dummy->ending_addr)
160 /* End address of the user specified per set. */
161 return child->thread.per_user.end;
162 else if (addr == (addr_t) &dummy->perc_atmid)
163 /* PER code, ATMID and AI of the last PER trap */
164 return (unsigned long)
165 child->thread.per_event.cause << (BITS_PER_LONG - 16);
166 else if (addr == (addr_t) &dummy->address)
167 /* Address of the last PER trap */
168 return child->thread.per_event.address;
169 else if (addr == (addr_t) &dummy->access_id)
170 /* Access id of the last PER trap */
171 return (unsigned long)
172 child->thread.per_event.paid << (BITS_PER_LONG - 8);
173 return 0;
174}
175
176/*
177 * Read the word at offset addr from the user area of a process. The
178 * trouble here is that the information is littered over different
179 * locations. The process registers are found on the kernel stack,
180 * the floating point stuff and the trace settings are stored in
181 * the task structure. In addition the different structures in
182 * struct user contain pad bytes that should be read as zeroes.
183 * Lovely...
184 */
185static unsigned long __peek_user(struct task_struct *child, addr_t addr)
186{
187 struct user *dummy = NULL;
188 addr_t offset, tmp;
189
190 if (addr < (addr_t) &dummy->regs.acrs) {
191 /*
192 * psw and gprs are stored on the stack
193 */
194 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
195 if (addr == (addr_t) &dummy->regs.psw.mask) {
196 /* Return a clean psw mask. */
197 tmp &= PSW_MASK_USER | PSW_MASK_RI;
198 tmp |= PSW_USER_BITS;
199 }
200
201 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
202 /*
203 * access registers are stored in the thread structure
204 */
205 offset = addr - (addr_t) &dummy->regs.acrs;
206 /*
207 * Very special case: old & broken 64 bit gdb reading
208 * from acrs[15]. Result is a 64 bit value. Read the
209 * 32 bit acrs[15] value and shift it by 32. Sick...
210 */
211 if (addr == (addr_t) &dummy->regs.acrs[15])
212 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
213 else
214 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
215
216 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
217 /*
218 * orig_gpr2 is stored on the kernel stack
219 */
220 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
221
222 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
223 /*
224 * prevent reads of padding hole between
225 * orig_gpr2 and fp_regs on s390.
226 */
227 tmp = 0;
228
229 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
230 /*
231 * floating point control reg. is in the thread structure
232 */
233 tmp = child->thread.fpu.fpc;
234 tmp <<= BITS_PER_LONG - 32;
235
236 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
237 /*
238 * floating point regs. are either in child->thread.fpu
239 * or the child->thread.fpu.vxrs array
240 */
241 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
242 if (MACHINE_HAS_VX)
243 tmp = *(addr_t *)
244 ((addr_t) child->thread.fpu.vxrs + 2*offset);
245 else
246 tmp = *(addr_t *)
247 ((addr_t) child->thread.fpu.fprs + offset);
248
249 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
250 /*
251 * Handle access to the per_info structure.
252 */
253 addr -= (addr_t) &dummy->regs.per_info;
254 tmp = __peek_user_per(child, addr);
255
256 } else
257 tmp = 0;
258
259 return tmp;
260}
261
262static int
263peek_user(struct task_struct *child, addr_t addr, addr_t data)
264{
265 addr_t tmp, mask;
266
267 /*
268 * Stupid gdb peeks/pokes the access registers in 64 bit with
269 * an alignment of 4. Programmers from hell...
270 */
271 mask = __ADDR_MASK;
272 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
273 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
274 mask = 3;
275 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
276 return -EIO;
277
278 tmp = __peek_user(child, addr);
279 return put_user(tmp, (addr_t __user *) data);
280}
281
282static inline void __poke_user_per(struct task_struct *child,
283 addr_t addr, addr_t data)
284{
285 struct per_struct_kernel *dummy = NULL;
286
287 /*
288 * There are only three fields in the per_info struct that the
289 * debugger user can write to.
290 * 1) cr9: the debugger wants to set a new PER event mask
291 * 2) starting_addr: the debugger wants to set a new starting
292 * address to use with the PER event mask.
293 * 3) ending_addr: the debugger wants to set a new ending
294 * address to use with the PER event mask.
295 * The user specified PER event mask and the start and end
296 * addresses are used only if single stepping is not in effect.
297 * Writes to any other field in per_info are ignored.
298 */
299 if (addr == (addr_t) &dummy->cr9)
300 /* PER event mask of the user specified per set. */
301 child->thread.per_user.control =
302 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
303 else if (addr == (addr_t) &dummy->starting_addr)
304 /* Starting address of the user specified per set. */
305 child->thread.per_user.start = data;
306 else if (addr == (addr_t) &dummy->ending_addr)
307 /* Ending address of the user specified per set. */
308 child->thread.per_user.end = data;
309}
310
311/*
312 * Write a word to the user area of a process at location addr. This
313 * operation does have an additional problem compared to peek_user.
314 * Stores to the program status word and on the floating point
315 * control register needs to get checked for validity.
316 */
317static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
318{
319 struct user *dummy = NULL;
320 addr_t offset;
321
322 if (addr < (addr_t) &dummy->regs.acrs) {
323 /*
324 * psw and gprs are stored on the stack
325 */
326 if (addr == (addr_t) &dummy->regs.psw.mask) {
327 unsigned long mask = PSW_MASK_USER;
328
329 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
330 if ((data ^ PSW_USER_BITS) & ~mask)
331 /* Invalid psw mask. */
332 return -EINVAL;
333 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
334 /* Invalid address-space-control bits */
335 return -EINVAL;
336 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
337 /* Invalid addressing mode bits */
338 return -EINVAL;
339 }
340 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
341
342 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
343 /*
344 * access registers are stored in the thread structure
345 */
346 offset = addr - (addr_t) &dummy->regs.acrs;
347 /*
348 * Very special case: old & broken 64 bit gdb writing
349 * to acrs[15] with a 64 bit value. Ignore the lower
350 * half of the value and write the upper 32 bit to
351 * acrs[15]. Sick...
352 */
353 if (addr == (addr_t) &dummy->regs.acrs[15])
354 child->thread.acrs[15] = (unsigned int) (data >> 32);
355 else
356 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
357
358 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
359 /*
360 * orig_gpr2 is stored on the kernel stack
361 */
362 task_pt_regs(child)->orig_gpr2 = data;
363
364 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
365 /*
366 * prevent writes of padding hole between
367 * orig_gpr2 and fp_regs on s390.
368 */
369 return 0;
370
371 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
372 /*
373 * floating point control reg. is in the thread structure
374 */
375 if ((unsigned int) data != 0 ||
376 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
377 return -EINVAL;
378 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
379
380 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
381 /*
382 * floating point regs. are either in child->thread.fpu
383 * or the child->thread.fpu.vxrs array
384 */
385 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
386 if (MACHINE_HAS_VX)
387 *(addr_t *)((addr_t)
388 child->thread.fpu.vxrs + 2*offset) = data;
389 else
390 *(addr_t *)((addr_t)
391 child->thread.fpu.fprs + offset) = data;
392
393 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
394 /*
395 * Handle access to the per_info structure.
396 */
397 addr -= (addr_t) &dummy->regs.per_info;
398 __poke_user_per(child, addr, data);
399
400 }
401
402 return 0;
403}
404
405static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
406{
407 addr_t mask;
408
409 /*
410 * Stupid gdb peeks/pokes the access registers in 64 bit with
411 * an alignment of 4. Programmers from hell indeed...
412 */
413 mask = __ADDR_MASK;
414 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
415 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
416 mask = 3;
417 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
418 return -EIO;
419
420 return __poke_user(child, addr, data);
421}
422
423long arch_ptrace(struct task_struct *child, long request,
424 unsigned long addr, unsigned long data)
425{
426 ptrace_area parea;
427 int copied, ret;
428
429 switch (request) {
430 case PTRACE_PEEKUSR:
431 /* read the word at location addr in the USER area. */
432 return peek_user(child, addr, data);
433
434 case PTRACE_POKEUSR:
435 /* write the word at location addr in the USER area */
436 return poke_user(child, addr, data);
437
438 case PTRACE_PEEKUSR_AREA:
439 case PTRACE_POKEUSR_AREA:
440 if (copy_from_user(&parea, (void __force __user *) addr,
441 sizeof(parea)))
442 return -EFAULT;
443 addr = parea.kernel_addr;
444 data = parea.process_addr;
445 copied = 0;
446 while (copied < parea.len) {
447 if (request == PTRACE_PEEKUSR_AREA)
448 ret = peek_user(child, addr, data);
449 else {
450 addr_t utmp;
451 if (get_user(utmp,
452 (addr_t __force __user *) data))
453 return -EFAULT;
454 ret = poke_user(child, addr, utmp);
455 }
456 if (ret)
457 return ret;
458 addr += sizeof(unsigned long);
459 data += sizeof(unsigned long);
460 copied += sizeof(unsigned long);
461 }
462 return 0;
463 case PTRACE_GET_LAST_BREAK:
464 put_user(child->thread.last_break,
465 (unsigned long __user *) data);
466 return 0;
467 case PTRACE_ENABLE_TE:
468 if (!MACHINE_HAS_TE)
469 return -EIO;
470 child->thread.per_flags &= ~PER_FLAG_NO_TE;
471 return 0;
472 case PTRACE_DISABLE_TE:
473 if (!MACHINE_HAS_TE)
474 return -EIO;
475 child->thread.per_flags |= PER_FLAG_NO_TE;
476 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
477 return 0;
478 case PTRACE_TE_ABORT_RAND:
479 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
480 return -EIO;
481 switch (data) {
482 case 0UL:
483 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
484 break;
485 case 1UL:
486 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
487 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
488 break;
489 case 2UL:
490 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
491 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
492 break;
493 default:
494 return -EINVAL;
495 }
496 return 0;
497 default:
498 return ptrace_request(child, request, addr, data);
499 }
500}
501
502#ifdef CONFIG_COMPAT
503/*
504 * Now the fun part starts... a 31 bit program running in the
505 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
506 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
507 * to handle, the difference to the 64 bit versions of the requests
508 * is that the access is done in multiples of 4 byte instead of
509 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
510 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
511 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
512 * is a 31 bit program too, the content of struct user can be
513 * emulated. A 31 bit program peeking into the struct user of
514 * a 64 bit program is a no-no.
515 */
516
517/*
518 * Same as peek_user_per but for a 31 bit program.
519 */
520static inline __u32 __peek_user_per_compat(struct task_struct *child,
521 addr_t addr)
522{
523 struct compat_per_struct_kernel *dummy32 = NULL;
524
525 if (addr == (addr_t) &dummy32->cr9)
526 /* Control bits of the active per set. */
527 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
528 PER_EVENT_IFETCH : child->thread.per_user.control;
529 else if (addr == (addr_t) &dummy32->cr10)
530 /* Start address of the active per set. */
531 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
532 0 : child->thread.per_user.start;
533 else if (addr == (addr_t) &dummy32->cr11)
534 /* End address of the active per set. */
535 return test_thread_flag(TIF_SINGLE_STEP) ?
536 PSW32_ADDR_INSN : child->thread.per_user.end;
537 else if (addr == (addr_t) &dummy32->bits)
538 /* Single-step bit. */
539 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
540 0x80000000 : 0;
541 else if (addr == (addr_t) &dummy32->starting_addr)
542 /* Start address of the user specified per set. */
543 return (__u32) child->thread.per_user.start;
544 else if (addr == (addr_t) &dummy32->ending_addr)
545 /* End address of the user specified per set. */
546 return (__u32) child->thread.per_user.end;
547 else if (addr == (addr_t) &dummy32->perc_atmid)
548 /* PER code, ATMID and AI of the last PER trap */
549 return (__u32) child->thread.per_event.cause << 16;
550 else if (addr == (addr_t) &dummy32->address)
551 /* Address of the last PER trap */
552 return (__u32) child->thread.per_event.address;
553 else if (addr == (addr_t) &dummy32->access_id)
554 /* Access id of the last PER trap */
555 return (__u32) child->thread.per_event.paid << 24;
556 return 0;
557}
558
559/*
560 * Same as peek_user but for a 31 bit program.
561 */
562static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
563{
564 struct compat_user *dummy32 = NULL;
565 addr_t offset;
566 __u32 tmp;
567
568 if (addr < (addr_t) &dummy32->regs.acrs) {
569 struct pt_regs *regs = task_pt_regs(child);
570 /*
571 * psw and gprs are stored on the stack
572 */
573 if (addr == (addr_t) &dummy32->regs.psw.mask) {
574 /* Fake a 31 bit psw mask. */
575 tmp = (__u32)(regs->psw.mask >> 32);
576 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
577 tmp |= PSW32_USER_BITS;
578 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
579 /* Fake a 31 bit psw address. */
580 tmp = (__u32) regs->psw.addr |
581 (__u32)(regs->psw.mask & PSW_MASK_BA);
582 } else {
583 /* gpr 0-15 */
584 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
585 }
586 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
587 /*
588 * access registers are stored in the thread structure
589 */
590 offset = addr - (addr_t) &dummy32->regs.acrs;
591 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
592
593 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
594 /*
595 * orig_gpr2 is stored on the kernel stack
596 */
597 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
598
599 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
600 /*
601 * prevent reads of padding hole between
602 * orig_gpr2 and fp_regs on s390.
603 */
604 tmp = 0;
605
606 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
607 /*
608 * floating point control reg. is in the thread structure
609 */
610 tmp = child->thread.fpu.fpc;
611
612 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
613 /*
614 * floating point regs. are either in child->thread.fpu
615 * or the child->thread.fpu.vxrs array
616 */
617 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
618 if (MACHINE_HAS_VX)
619 tmp = *(__u32 *)
620 ((addr_t) child->thread.fpu.vxrs + 2*offset);
621 else
622 tmp = *(__u32 *)
623 ((addr_t) child->thread.fpu.fprs + offset);
624
625 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
626 /*
627 * Handle access to the per_info structure.
628 */
629 addr -= (addr_t) &dummy32->regs.per_info;
630 tmp = __peek_user_per_compat(child, addr);
631
632 } else
633 tmp = 0;
634
635 return tmp;
636}
637
638static int peek_user_compat(struct task_struct *child,
639 addr_t addr, addr_t data)
640{
641 __u32 tmp;
642
643 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
644 return -EIO;
645
646 tmp = __peek_user_compat(child, addr);
647 return put_user(tmp, (__u32 __user *) data);
648}
649
650/*
651 * Same as poke_user_per but for a 31 bit program.
652 */
653static inline void __poke_user_per_compat(struct task_struct *child,
654 addr_t addr, __u32 data)
655{
656 struct compat_per_struct_kernel *dummy32 = NULL;
657
658 if (addr == (addr_t) &dummy32->cr9)
659 /* PER event mask of the user specified per set. */
660 child->thread.per_user.control =
661 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
662 else if (addr == (addr_t) &dummy32->starting_addr)
663 /* Starting address of the user specified per set. */
664 child->thread.per_user.start = data;
665 else if (addr == (addr_t) &dummy32->ending_addr)
666 /* Ending address of the user specified per set. */
667 child->thread.per_user.end = data;
668}
669
670/*
671 * Same as poke_user but for a 31 bit program.
672 */
673static int __poke_user_compat(struct task_struct *child,
674 addr_t addr, addr_t data)
675{
676 struct compat_user *dummy32 = NULL;
677 __u32 tmp = (__u32) data;
678 addr_t offset;
679
680 if (addr < (addr_t) &dummy32->regs.acrs) {
681 struct pt_regs *regs = task_pt_regs(child);
682 /*
683 * psw, gprs, acrs and orig_gpr2 are stored on the stack
684 */
685 if (addr == (addr_t) &dummy32->regs.psw.mask) {
686 __u32 mask = PSW32_MASK_USER;
687
688 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
689 /* Build a 64 bit psw mask from 31 bit mask. */
690 if ((tmp ^ PSW32_USER_BITS) & ~mask)
691 /* Invalid psw mask. */
692 return -EINVAL;
693 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
694 /* Invalid address-space-control bits */
695 return -EINVAL;
696 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
697 (regs->psw.mask & PSW_MASK_BA) |
698 (__u64)(tmp & mask) << 32;
699 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
700 /* Build a 64 bit psw address from 31 bit address. */
701 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
702 /* Transfer 31 bit amode bit to psw mask. */
703 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
704 (__u64)(tmp & PSW32_ADDR_AMODE);
705 } else {
706 /* gpr 0-15 */
707 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
708 }
709 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
710 /*
711 * access registers are stored in the thread structure
712 */
713 offset = addr - (addr_t) &dummy32->regs.acrs;
714 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
715
716 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
717 /*
718 * orig_gpr2 is stored on the kernel stack
719 */
720 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
721
722 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
723 /*
724 * prevent writess of padding hole between
725 * orig_gpr2 and fp_regs on s390.
726 */
727 return 0;
728
729 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
730 /*
731 * floating point control reg. is in the thread structure
732 */
733 if (test_fp_ctl(tmp))
734 return -EINVAL;
735 child->thread.fpu.fpc = data;
736
737 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
738 /*
739 * floating point regs. are either in child->thread.fpu
740 * or the child->thread.fpu.vxrs array
741 */
742 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
743 if (MACHINE_HAS_VX)
744 *(__u32 *)((addr_t)
745 child->thread.fpu.vxrs + 2*offset) = tmp;
746 else
747 *(__u32 *)((addr_t)
748 child->thread.fpu.fprs + offset) = tmp;
749
750 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
751 /*
752 * Handle access to the per_info structure.
753 */
754 addr -= (addr_t) &dummy32->regs.per_info;
755 __poke_user_per_compat(child, addr, data);
756 }
757
758 return 0;
759}
760
761static int poke_user_compat(struct task_struct *child,
762 addr_t addr, addr_t data)
763{
764 if (!is_compat_task() || (addr & 3) ||
765 addr > sizeof(struct compat_user) - 3)
766 return -EIO;
767
768 return __poke_user_compat(child, addr, data);
769}
770
771long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
772 compat_ulong_t caddr, compat_ulong_t cdata)
773{
774 unsigned long addr = caddr;
775 unsigned long data = cdata;
776 compat_ptrace_area parea;
777 int copied, ret;
778
779 switch (request) {
780 case PTRACE_PEEKUSR:
781 /* read the word at location addr in the USER area. */
782 return peek_user_compat(child, addr, data);
783
784 case PTRACE_POKEUSR:
785 /* write the word at location addr in the USER area */
786 return poke_user_compat(child, addr, data);
787
788 case PTRACE_PEEKUSR_AREA:
789 case PTRACE_POKEUSR_AREA:
790 if (copy_from_user(&parea, (void __force __user *) addr,
791 sizeof(parea)))
792 return -EFAULT;
793 addr = parea.kernel_addr;
794 data = parea.process_addr;
795 copied = 0;
796 while (copied < parea.len) {
797 if (request == PTRACE_PEEKUSR_AREA)
798 ret = peek_user_compat(child, addr, data);
799 else {
800 __u32 utmp;
801 if (get_user(utmp,
802 (__u32 __force __user *) data))
803 return -EFAULT;
804 ret = poke_user_compat(child, addr, utmp);
805 }
806 if (ret)
807 return ret;
808 addr += sizeof(unsigned int);
809 data += sizeof(unsigned int);
810 copied += sizeof(unsigned int);
811 }
812 return 0;
813 case PTRACE_GET_LAST_BREAK:
814 put_user(child->thread.last_break,
815 (unsigned int __user *) data);
816 return 0;
817 }
818 return compat_ptrace_request(child, request, addr, data);
819}
820#endif
821
822asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
823{
824 unsigned long mask = -1UL;
825
826 /*
827 * The sysc_tracesys code in entry.S stored the system
828 * call number to gprs[2].
829 */
830 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
831 (tracehook_report_syscall_entry(regs) ||
832 regs->gprs[2] >= NR_syscalls)) {
833 /*
834 * Tracing decided this syscall should not happen or the
835 * debugger stored an invalid system call number. Skip
836 * the system call and the system call restart handling.
837 */
838 clear_pt_regs_flag(regs, PIF_SYSCALL);
839 return -1;
840 }
841
842 /* Do the secure computing check after ptrace. */
843 if (secure_computing(NULL)) {
844 /* seccomp failures shouldn't expose any additional code. */
845 return -1;
846 }
847
848 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
849 trace_sys_enter(regs, regs->gprs[2]);
850
851 if (is_compat_task())
852 mask = 0xffffffff;
853
854 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask,
855 regs->gprs[3] &mask, regs->gprs[4] &mask,
856 regs->gprs[5] &mask);
857
858 return regs->gprs[2];
859}
860
861asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
862{
863 audit_syscall_exit(regs);
864
865 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
866 trace_sys_exit(regs, regs->gprs[2]);
867
868 if (test_thread_flag(TIF_SYSCALL_TRACE))
869 tracehook_report_syscall_exit(regs, 0);
870}
871
872/*
873 * user_regset definitions.
874 */
875
876static int s390_regs_get(struct task_struct *target,
877 const struct user_regset *regset,
878 unsigned int pos, unsigned int count,
879 void *kbuf, void __user *ubuf)
880{
881 if (target == current)
882 save_access_regs(target->thread.acrs);
883
884 if (kbuf) {
885 unsigned long *k = kbuf;
886 while (count > 0) {
887 *k++ = __peek_user(target, pos);
888 count -= sizeof(*k);
889 pos += sizeof(*k);
890 }
891 } else {
892 unsigned long __user *u = ubuf;
893 while (count > 0) {
894 if (__put_user(__peek_user(target, pos), u++))
895 return -EFAULT;
896 count -= sizeof(*u);
897 pos += sizeof(*u);
898 }
899 }
900 return 0;
901}
902
903static int s390_regs_set(struct task_struct *target,
904 const struct user_regset *regset,
905 unsigned int pos, unsigned int count,
906 const void *kbuf, const void __user *ubuf)
907{
908 int rc = 0;
909
910 if (target == current)
911 save_access_regs(target->thread.acrs);
912
913 if (kbuf) {
914 const unsigned long *k = kbuf;
915 while (count > 0 && !rc) {
916 rc = __poke_user(target, pos, *k++);
917 count -= sizeof(*k);
918 pos += sizeof(*k);
919 }
920 } else {
921 const unsigned long __user *u = ubuf;
922 while (count > 0 && !rc) {
923 unsigned long word;
924 rc = __get_user(word, u++);
925 if (rc)
926 break;
927 rc = __poke_user(target, pos, word);
928 count -= sizeof(*u);
929 pos += sizeof(*u);
930 }
931 }
932
933 if (rc == 0 && target == current)
934 restore_access_regs(target->thread.acrs);
935
936 return rc;
937}
938
939static int s390_fpregs_get(struct task_struct *target,
940 const struct user_regset *regset, unsigned int pos,
941 unsigned int count, void *kbuf, void __user *ubuf)
942{
943 _s390_fp_regs fp_regs;
944
945 if (target == current)
946 save_fpu_regs();
947
948 fp_regs.fpc = target->thread.fpu.fpc;
949 fpregs_store(&fp_regs, &target->thread.fpu);
950
951 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
952 &fp_regs, 0, -1);
953}
954
955static int s390_fpregs_set(struct task_struct *target,
956 const struct user_regset *regset, unsigned int pos,
957 unsigned int count, const void *kbuf,
958 const void __user *ubuf)
959{
960 int rc = 0;
961 freg_t fprs[__NUM_FPRS];
962
963 if (target == current)
964 save_fpu_regs();
965
966 if (MACHINE_HAS_VX)
967 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
968 else
969 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
970
971 /* If setting FPC, must validate it first. */
972 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
973 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
974 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
975 0, offsetof(s390_fp_regs, fprs));
976 if (rc)
977 return rc;
978 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
979 return -EINVAL;
980 target->thread.fpu.fpc = ufpc[0];
981 }
982
983 if (rc == 0 && count > 0)
984 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
985 fprs, offsetof(s390_fp_regs, fprs), -1);
986 if (rc)
987 return rc;
988
989 if (MACHINE_HAS_VX)
990 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
991 else
992 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
993
994 return rc;
995}
996
997static int s390_last_break_get(struct task_struct *target,
998 const struct user_regset *regset,
999 unsigned int pos, unsigned int count,
1000 void *kbuf, void __user *ubuf)
1001{
1002 if (count > 0) {
1003 if (kbuf) {
1004 unsigned long *k = kbuf;
1005 *k = target->thread.last_break;
1006 } else {
1007 unsigned long __user *u = ubuf;
1008 if (__put_user(target->thread.last_break, u))
1009 return -EFAULT;
1010 }
1011 }
1012 return 0;
1013}
1014
1015static int s390_last_break_set(struct task_struct *target,
1016 const struct user_regset *regset,
1017 unsigned int pos, unsigned int count,
1018 const void *kbuf, const void __user *ubuf)
1019{
1020 return 0;
1021}
1022
1023static int s390_tdb_get(struct task_struct *target,
1024 const struct user_regset *regset,
1025 unsigned int pos, unsigned int count,
1026 void *kbuf, void __user *ubuf)
1027{
1028 struct pt_regs *regs = task_pt_regs(target);
1029 unsigned char *data;
1030
1031 if (!(regs->int_code & 0x200))
1032 return -ENODATA;
1033 data = target->thread.trap_tdb;
1034 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1035}
1036
1037static int s390_tdb_set(struct task_struct *target,
1038 const struct user_regset *regset,
1039 unsigned int pos, unsigned int count,
1040 const void *kbuf, const void __user *ubuf)
1041{
1042 return 0;
1043}
1044
1045static int s390_vxrs_low_get(struct task_struct *target,
1046 const struct user_regset *regset,
1047 unsigned int pos, unsigned int count,
1048 void *kbuf, void __user *ubuf)
1049{
1050 __u64 vxrs[__NUM_VXRS_LOW];
1051 int i;
1052
1053 if (!MACHINE_HAS_VX)
1054 return -ENODEV;
1055 if (target == current)
1056 save_fpu_regs();
1057 for (i = 0; i < __NUM_VXRS_LOW; i++)
1058 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1059 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1060}
1061
1062static int s390_vxrs_low_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 __u64 vxrs[__NUM_VXRS_LOW];
1068 int i, rc;
1069
1070 if (!MACHINE_HAS_VX)
1071 return -ENODEV;
1072 if (target == current)
1073 save_fpu_regs();
1074
1075 for (i = 0; i < __NUM_VXRS_LOW; i++)
1076 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1077
1078 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1079 if (rc == 0)
1080 for (i = 0; i < __NUM_VXRS_LOW; i++)
1081 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1082
1083 return rc;
1084}
1085
1086static int s390_vxrs_high_get(struct task_struct *target,
1087 const struct user_regset *regset,
1088 unsigned int pos, unsigned int count,
1089 void *kbuf, void __user *ubuf)
1090{
1091 __vector128 vxrs[__NUM_VXRS_HIGH];
1092
1093 if (!MACHINE_HAS_VX)
1094 return -ENODEV;
1095 if (target == current)
1096 save_fpu_regs();
1097 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1098
1099 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1100}
1101
1102static int s390_vxrs_high_set(struct task_struct *target,
1103 const struct user_regset *regset,
1104 unsigned int pos, unsigned int count,
1105 const void *kbuf, const void __user *ubuf)
1106{
1107 int rc;
1108
1109 if (!MACHINE_HAS_VX)
1110 return -ENODEV;
1111 if (target == current)
1112 save_fpu_regs();
1113
1114 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1115 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1116 return rc;
1117}
1118
1119static int s390_system_call_get(struct task_struct *target,
1120 const struct user_regset *regset,
1121 unsigned int pos, unsigned int count,
1122 void *kbuf, void __user *ubuf)
1123{
1124 unsigned int *data = &target->thread.system_call;
1125 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1126 data, 0, sizeof(unsigned int));
1127}
1128
1129static int s390_system_call_set(struct task_struct *target,
1130 const struct user_regset *regset,
1131 unsigned int pos, unsigned int count,
1132 const void *kbuf, const void __user *ubuf)
1133{
1134 unsigned int *data = &target->thread.system_call;
1135 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1136 data, 0, sizeof(unsigned int));
1137}
1138
1139static const struct user_regset s390_regsets[] = {
1140 {
1141 .core_note_type = NT_PRSTATUS,
1142 .n = sizeof(s390_regs) / sizeof(long),
1143 .size = sizeof(long),
1144 .align = sizeof(long),
1145 .get = s390_regs_get,
1146 .set = s390_regs_set,
1147 },
1148 {
1149 .core_note_type = NT_PRFPREG,
1150 .n = sizeof(s390_fp_regs) / sizeof(long),
1151 .size = sizeof(long),
1152 .align = sizeof(long),
1153 .get = s390_fpregs_get,
1154 .set = s390_fpregs_set,
1155 },
1156 {
1157 .core_note_type = NT_S390_SYSTEM_CALL,
1158 .n = 1,
1159 .size = sizeof(unsigned int),
1160 .align = sizeof(unsigned int),
1161 .get = s390_system_call_get,
1162 .set = s390_system_call_set,
1163 },
1164 {
1165 .core_note_type = NT_S390_LAST_BREAK,
1166 .n = 1,
1167 .size = sizeof(long),
1168 .align = sizeof(long),
1169 .get = s390_last_break_get,
1170 .set = s390_last_break_set,
1171 },
1172 {
1173 .core_note_type = NT_S390_TDB,
1174 .n = 1,
1175 .size = 256,
1176 .align = 1,
1177 .get = s390_tdb_get,
1178 .set = s390_tdb_set,
1179 },
1180 {
1181 .core_note_type = NT_S390_VXRS_LOW,
1182 .n = __NUM_VXRS_LOW,
1183 .size = sizeof(__u64),
1184 .align = sizeof(__u64),
1185 .get = s390_vxrs_low_get,
1186 .set = s390_vxrs_low_set,
1187 },
1188 {
1189 .core_note_type = NT_S390_VXRS_HIGH,
1190 .n = __NUM_VXRS_HIGH,
1191 .size = sizeof(__vector128),
1192 .align = sizeof(__vector128),
1193 .get = s390_vxrs_high_get,
1194 .set = s390_vxrs_high_set,
1195 },
1196};
1197
1198static const struct user_regset_view user_s390_view = {
1199 .name = UTS_MACHINE,
1200 .e_machine = EM_S390,
1201 .regsets = s390_regsets,
1202 .n = ARRAY_SIZE(s390_regsets)
1203};
1204
1205#ifdef CONFIG_COMPAT
1206static int s390_compat_regs_get(struct task_struct *target,
1207 const struct user_regset *regset,
1208 unsigned int pos, unsigned int count,
1209 void *kbuf, void __user *ubuf)
1210{
1211 if (target == current)
1212 save_access_regs(target->thread.acrs);
1213
1214 if (kbuf) {
1215 compat_ulong_t *k = kbuf;
1216 while (count > 0) {
1217 *k++ = __peek_user_compat(target, pos);
1218 count -= sizeof(*k);
1219 pos += sizeof(*k);
1220 }
1221 } else {
1222 compat_ulong_t __user *u = ubuf;
1223 while (count > 0) {
1224 if (__put_user(__peek_user_compat(target, pos), u++))
1225 return -EFAULT;
1226 count -= sizeof(*u);
1227 pos += sizeof(*u);
1228 }
1229 }
1230 return 0;
1231}
1232
1233static int s390_compat_regs_set(struct task_struct *target,
1234 const struct user_regset *regset,
1235 unsigned int pos, unsigned int count,
1236 const void *kbuf, const void __user *ubuf)
1237{
1238 int rc = 0;
1239
1240 if (target == current)
1241 save_access_regs(target->thread.acrs);
1242
1243 if (kbuf) {
1244 const compat_ulong_t *k = kbuf;
1245 while (count > 0 && !rc) {
1246 rc = __poke_user_compat(target, pos, *k++);
1247 count -= sizeof(*k);
1248 pos += sizeof(*k);
1249 }
1250 } else {
1251 const compat_ulong_t __user *u = ubuf;
1252 while (count > 0 && !rc) {
1253 compat_ulong_t word;
1254 rc = __get_user(word, u++);
1255 if (rc)
1256 break;
1257 rc = __poke_user_compat(target, pos, word);
1258 count -= sizeof(*u);
1259 pos += sizeof(*u);
1260 }
1261 }
1262
1263 if (rc == 0 && target == current)
1264 restore_access_regs(target->thread.acrs);
1265
1266 return rc;
1267}
1268
1269static int s390_compat_regs_high_get(struct task_struct *target,
1270 const struct user_regset *regset,
1271 unsigned int pos, unsigned int count,
1272 void *kbuf, void __user *ubuf)
1273{
1274 compat_ulong_t *gprs_high;
1275
1276 gprs_high = (compat_ulong_t *)
1277 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1278 if (kbuf) {
1279 compat_ulong_t *k = kbuf;
1280 while (count > 0) {
1281 *k++ = *gprs_high;
1282 gprs_high += 2;
1283 count -= sizeof(*k);
1284 }
1285 } else {
1286 compat_ulong_t __user *u = ubuf;
1287 while (count > 0) {
1288 if (__put_user(*gprs_high, u++))
1289 return -EFAULT;
1290 gprs_high += 2;
1291 count -= sizeof(*u);
1292 }
1293 }
1294 return 0;
1295}
1296
1297static int s390_compat_regs_high_set(struct task_struct *target,
1298 const struct user_regset *regset,
1299 unsigned int pos, unsigned int count,
1300 const void *kbuf, const void __user *ubuf)
1301{
1302 compat_ulong_t *gprs_high;
1303 int rc = 0;
1304
1305 gprs_high = (compat_ulong_t *)
1306 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1307 if (kbuf) {
1308 const compat_ulong_t *k = kbuf;
1309 while (count > 0) {
1310 *gprs_high = *k++;
1311 *gprs_high += 2;
1312 count -= sizeof(*k);
1313 }
1314 } else {
1315 const compat_ulong_t __user *u = ubuf;
1316 while (count > 0 && !rc) {
1317 unsigned long word;
1318 rc = __get_user(word, u++);
1319 if (rc)
1320 break;
1321 *gprs_high = word;
1322 *gprs_high += 2;
1323 count -= sizeof(*u);
1324 }
1325 }
1326
1327 return rc;
1328}
1329
1330static int s390_compat_last_break_get(struct task_struct *target,
1331 const struct user_regset *regset,
1332 unsigned int pos, unsigned int count,
1333 void *kbuf, void __user *ubuf)
1334{
1335 compat_ulong_t last_break;
1336
1337 if (count > 0) {
1338 last_break = target->thread.last_break;
1339 if (kbuf) {
1340 unsigned long *k = kbuf;
1341 *k = last_break;
1342 } else {
1343 unsigned long __user *u = ubuf;
1344 if (__put_user(last_break, u))
1345 return -EFAULT;
1346 }
1347 }
1348 return 0;
1349}
1350
1351static int s390_compat_last_break_set(struct task_struct *target,
1352 const struct user_regset *regset,
1353 unsigned int pos, unsigned int count,
1354 const void *kbuf, const void __user *ubuf)
1355{
1356 return 0;
1357}
1358
1359static const struct user_regset s390_compat_regsets[] = {
1360 {
1361 .core_note_type = NT_PRSTATUS,
1362 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1363 .size = sizeof(compat_long_t),
1364 .align = sizeof(compat_long_t),
1365 .get = s390_compat_regs_get,
1366 .set = s390_compat_regs_set,
1367 },
1368 {
1369 .core_note_type = NT_PRFPREG,
1370 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1371 .size = sizeof(compat_long_t),
1372 .align = sizeof(compat_long_t),
1373 .get = s390_fpregs_get,
1374 .set = s390_fpregs_set,
1375 },
1376 {
1377 .core_note_type = NT_S390_SYSTEM_CALL,
1378 .n = 1,
1379 .size = sizeof(compat_uint_t),
1380 .align = sizeof(compat_uint_t),
1381 .get = s390_system_call_get,
1382 .set = s390_system_call_set,
1383 },
1384 {
1385 .core_note_type = NT_S390_LAST_BREAK,
1386 .n = 1,
1387 .size = sizeof(long),
1388 .align = sizeof(long),
1389 .get = s390_compat_last_break_get,
1390 .set = s390_compat_last_break_set,
1391 },
1392 {
1393 .core_note_type = NT_S390_TDB,
1394 .n = 1,
1395 .size = 256,
1396 .align = 1,
1397 .get = s390_tdb_get,
1398 .set = s390_tdb_set,
1399 },
1400 {
1401 .core_note_type = NT_S390_VXRS_LOW,
1402 .n = __NUM_VXRS_LOW,
1403 .size = sizeof(__u64),
1404 .align = sizeof(__u64),
1405 .get = s390_vxrs_low_get,
1406 .set = s390_vxrs_low_set,
1407 },
1408 {
1409 .core_note_type = NT_S390_VXRS_HIGH,
1410 .n = __NUM_VXRS_HIGH,
1411 .size = sizeof(__vector128),
1412 .align = sizeof(__vector128),
1413 .get = s390_vxrs_high_get,
1414 .set = s390_vxrs_high_set,
1415 },
1416 {
1417 .core_note_type = NT_S390_HIGH_GPRS,
1418 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1419 .size = sizeof(compat_long_t),
1420 .align = sizeof(compat_long_t),
1421 .get = s390_compat_regs_high_get,
1422 .set = s390_compat_regs_high_set,
1423 },
1424};
1425
1426static const struct user_regset_view user_s390_compat_view = {
1427 .name = "s390",
1428 .e_machine = EM_S390,
1429 .regsets = s390_compat_regsets,
1430 .n = ARRAY_SIZE(s390_compat_regsets)
1431};
1432#endif
1433
1434const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1435{
1436#ifdef CONFIG_COMPAT
1437 if (test_tsk_thread_flag(task, TIF_31BIT))
1438 return &user_s390_compat_view;
1439#endif
1440 return &user_s390_view;
1441}
1442
1443static const char *gpr_names[NUM_GPRS] = {
1444 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1445 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1446};
1447
1448unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1449{
1450 if (offset >= NUM_GPRS)
1451 return 0;
1452 return regs->gprs[offset];
1453}
1454
1455int regs_query_register_offset(const char *name)
1456{
1457 unsigned long offset;
1458
1459 if (!name || *name != 'r')
1460 return -EINVAL;
1461 if (kstrtoul(name + 1, 10, &offset))
1462 return -EINVAL;
1463 if (offset >= NUM_GPRS)
1464 return -EINVAL;
1465 return offset;
1466}
1467
1468const char *regs_query_register_name(unsigned int offset)
1469{
1470 if (offset >= NUM_GPRS)
1471 return NULL;
1472 return gpr_names[offset];
1473}
1474
1475static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1476{
1477 unsigned long ksp = kernel_stack_pointer(regs);
1478
1479 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1480}
1481
1482/**
1483 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1484 * @regs:pt_regs which contains kernel stack pointer.
1485 * @n:stack entry number.
1486 *
1487 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1488 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1489 * this returns 0.
1490 */
1491unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1492{
1493 unsigned long addr;
1494
1495 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1496 if (!regs_within_kernel_stack(regs, addr))
1497 return 0;
1498 return *(unsigned long *)addr;
1499}