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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 "asm/ptrace.h"
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/sched/task_stack.h>
14#include <linux/mm.h>
15#include <linux/smp.h>
16#include <linux/errno.h>
17#include <linux/ptrace.h>
18#include <linux/user.h>
19#include <linux/security.h>
20#include <linux/audit.h>
21#include <linux/signal.h>
22#include <linux/elf.h>
23#include <linux/regset.h>
24#include <linux/seccomp.h>
25#include <linux/compat.h>
26#include <trace/syscall.h>
27#include <asm/page.h>
28#include <linux/uaccess.h>
29#include <asm/unistd.h>
30#include <asm/switch_to.h>
31#include <asm/runtime_instr.h>
32#include <asm/facility.h>
33#include <asm/fpu/api.h>
34
35#include "entry.h"
36
37#ifdef CONFIG_COMPAT
38#include "compat_ptrace.h"
39#endif
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 union ctlreg0 cr0_old, cr0_new;
46 union ctlreg2 cr2_old, cr2_new;
47 int cr0_changed, cr2_changed;
48 union {
49 struct ctlreg regs[3];
50 struct {
51 struct ctlreg control;
52 struct ctlreg start;
53 struct ctlreg end;
54 };
55 } old, new;
56
57 local_ctl_store(0, &cr0_old.reg);
58 local_ctl_store(2, &cr2_old.reg);
59 cr0_new = cr0_old;
60 cr2_new = cr2_old;
61 /* Take care of the enable/disable of transactional execution. */
62 if (MACHINE_HAS_TE) {
63 /* Set or clear transaction execution TXC bit 8. */
64 cr0_new.tcx = 1;
65 if (task->thread.per_flags & PER_FLAG_NO_TE)
66 cr0_new.tcx = 0;
67 /* Set or clear transaction execution TDC bits 62 and 63. */
68 cr2_new.tdc = 0;
69 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
70 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
71 cr2_new.tdc = 1;
72 else
73 cr2_new.tdc = 2;
74 }
75 }
76 /* Take care of enable/disable of guarded storage. */
77 if (MACHINE_HAS_GS) {
78 cr2_new.gse = 0;
79 if (task->thread.gs_cb)
80 cr2_new.gse = 1;
81 }
82 /* Load control register 0/2 iff changed */
83 cr0_changed = cr0_new.val != cr0_old.val;
84 cr2_changed = cr2_new.val != cr2_old.val;
85 if (cr0_changed)
86 local_ctl_load(0, &cr0_new.reg);
87 if (cr2_changed)
88 local_ctl_load(2, &cr2_new.reg);
89 /* Copy user specified PER registers */
90 new.control.val = thread->per_user.control;
91 new.start.val = thread->per_user.start;
92 new.end.val = thread->per_user.end;
93
94 /* merge TIF_SINGLE_STEP into user specified PER registers. */
95 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
96 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
97 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
98 new.control.val |= PER_EVENT_BRANCH;
99 else
100 new.control.val |= PER_EVENT_IFETCH;
101 new.control.val |= PER_CONTROL_SUSPENSION;
102 new.control.val |= PER_EVENT_TRANSACTION_END;
103 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
104 new.control.val |= PER_EVENT_IFETCH;
105 new.start.val = 0;
106 new.end.val = -1UL;
107 }
108
109 /* Take care of the PER enablement bit in the PSW. */
110 if (!(new.control.val & PER_EVENT_MASK)) {
111 regs->psw.mask &= ~PSW_MASK_PER;
112 return;
113 }
114 regs->psw.mask |= PSW_MASK_PER;
115 __local_ctl_store(9, 11, old.regs);
116 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
117 __local_ctl_load(9, 11, new.regs);
118}
119
120void user_enable_single_step(struct task_struct *task)
121{
122 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
123 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
124}
125
126void user_disable_single_step(struct task_struct *task)
127{
128 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
129 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
130}
131
132void user_enable_block_step(struct task_struct *task)
133{
134 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
135 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
136}
137
138/*
139 * Called by kernel/ptrace.c when detaching..
140 *
141 * Clear all debugging related fields.
142 */
143void ptrace_disable(struct task_struct *task)
144{
145 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
146 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
147 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
148 clear_tsk_thread_flag(task, TIF_PER_TRAP);
149 task->thread.per_flags = 0;
150}
151
152#define __ADDR_MASK 7
153
154static inline unsigned long __peek_user_per(struct task_struct *child,
155 addr_t addr)
156{
157 if (addr == offsetof(struct per_struct_kernel, cr9))
158 /* Control bits of the active per set. */
159 return test_thread_flag(TIF_SINGLE_STEP) ?
160 PER_EVENT_IFETCH : child->thread.per_user.control;
161 else if (addr == offsetof(struct per_struct_kernel, cr10))
162 /* Start address of the active per set. */
163 return test_thread_flag(TIF_SINGLE_STEP) ?
164 0 : child->thread.per_user.start;
165 else if (addr == offsetof(struct per_struct_kernel, cr11))
166 /* End address of the active per set. */
167 return test_thread_flag(TIF_SINGLE_STEP) ?
168 -1UL : child->thread.per_user.end;
169 else if (addr == offsetof(struct per_struct_kernel, bits))
170 /* Single-step bit. */
171 return test_thread_flag(TIF_SINGLE_STEP) ?
172 (1UL << (BITS_PER_LONG - 1)) : 0;
173 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
174 /* Start address of the user specified per set. */
175 return child->thread.per_user.start;
176 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
177 /* End address of the user specified per set. */
178 return child->thread.per_user.end;
179 else if (addr == offsetof(struct per_struct_kernel, perc_atmid))
180 /* PER code, ATMID and AI of the last PER trap */
181 return (unsigned long)
182 child->thread.per_event.cause << (BITS_PER_LONG - 16);
183 else if (addr == offsetof(struct per_struct_kernel, address))
184 /* Address of the last PER trap */
185 return child->thread.per_event.address;
186 else if (addr == offsetof(struct per_struct_kernel, access_id))
187 /* Access id of the last PER trap */
188 return (unsigned long)
189 child->thread.per_event.paid << (BITS_PER_LONG - 8);
190 return 0;
191}
192
193/*
194 * Read the word at offset addr from the user area of a process. The
195 * trouble here is that the information is littered over different
196 * locations. The process registers are found on the kernel stack,
197 * the floating point stuff and the trace settings are stored in
198 * the task structure. In addition the different structures in
199 * struct user contain pad bytes that should be read as zeroes.
200 * Lovely...
201 */
202static unsigned long __peek_user(struct task_struct *child, addr_t addr)
203{
204 addr_t offset, tmp;
205
206 if (addr < offsetof(struct user, 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 == offsetof(struct user, 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 < offsetof(struct user, regs.orig_gpr2)) {
218 /*
219 * access registers are stored in the thread structure
220 */
221 offset = addr - offsetof(struct user, 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 == offsetof(struct user, 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 == offsetof(struct user, 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 < offsetof(struct user, 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 == offsetof(struct user, 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 < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
253 /*
254 * floating point regs. are either in child->thread.fpu
255 * or the child->thread.fpu.vxrs array
256 */
257 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
258 if (cpu_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 < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
266 /*
267 * Handle access to the per_info structure.
268 */
269 addr -= offsetof(struct user, 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 >= offsetof(struct user, regs.acrs) &&
289 addr < offsetof(struct user, 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 /*
302 * There are only three fields in the per_info struct that the
303 * debugger user can write to.
304 * 1) cr9: the debugger wants to set a new PER event mask
305 * 2) starting_addr: the debugger wants to set a new starting
306 * address to use with the PER event mask.
307 * 3) ending_addr: the debugger wants to set a new ending
308 * address to use with the PER event mask.
309 * The user specified PER event mask and the start and end
310 * addresses are used only if single stepping is not in effect.
311 * Writes to any other field in per_info are ignored.
312 */
313 if (addr == offsetof(struct per_struct_kernel, cr9))
314 /* PER event mask of the user specified per set. */
315 child->thread.per_user.control =
316 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
317 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
318 /* Starting address of the user specified per set. */
319 child->thread.per_user.start = data;
320 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
321 /* Ending address of the user specified per set. */
322 child->thread.per_user.end = data;
323}
324
325/*
326 * Write a word to the user area of a process at location addr. This
327 * operation does have an additional problem compared to peek_user.
328 * Stores to the program status word and on the floating point
329 * control register needs to get checked for validity.
330 */
331static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
332{
333 addr_t offset;
334
335
336 if (addr < offsetof(struct user, regs.acrs)) {
337 struct pt_regs *regs = task_pt_regs(child);
338 /*
339 * psw and gprs are stored on the stack
340 */
341 if (addr == offsetof(struct user, regs.psw.mask)) {
342 unsigned long mask = PSW_MASK_USER;
343
344 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
345 if ((data ^ PSW_USER_BITS) & ~mask)
346 /* Invalid psw mask. */
347 return -EINVAL;
348 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
349 /* Invalid address-space-control bits */
350 return -EINVAL;
351 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
352 /* Invalid addressing mode bits */
353 return -EINVAL;
354 }
355
356 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
357 addr == offsetof(struct user, regs.gprs[2])) {
358 struct pt_regs *regs = task_pt_regs(child);
359
360 regs->int_code = 0x20000 | (data & 0xffff);
361 }
362 *(addr_t *)((addr_t) ®s->psw + addr) = data;
363 } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
364 /*
365 * access registers are stored in the thread structure
366 */
367 offset = addr - offsetof(struct user, regs.acrs);
368 /*
369 * Very special case: old & broken 64 bit gdb writing
370 * to acrs[15] with a 64 bit value. Ignore the lower
371 * half of the value and write the upper 32 bit to
372 * acrs[15]. Sick...
373 */
374 if (addr == offsetof(struct user, regs.acrs[15]))
375 child->thread.acrs[15] = (unsigned int) (data >> 32);
376 else
377 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
378
379 } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
380 /*
381 * orig_gpr2 is stored on the kernel stack
382 */
383 task_pt_regs(child)->orig_gpr2 = data;
384
385 } else if (addr < offsetof(struct user, regs.fp_regs)) {
386 /*
387 * prevent writes of padding hole between
388 * orig_gpr2 and fp_regs on s390.
389 */
390 return 0;
391
392 } else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
393 /*
394 * floating point control reg. is in the thread structure
395 */
396 if ((unsigned int)data != 0)
397 return -EINVAL;
398 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
399
400 } else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
401 /*
402 * floating point regs. are either in child->thread.fpu
403 * or the child->thread.fpu.vxrs array
404 */
405 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
406 if (cpu_has_vx())
407 *(addr_t *)((addr_t)
408 child->thread.fpu.vxrs + 2*offset) = data;
409 else
410 *(addr_t *)((addr_t)
411 child->thread.fpu.fprs + offset) = data;
412
413 } else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
414 /*
415 * Handle access to the per_info structure.
416 */
417 addr -= offsetof(struct user, regs.per_info);
418 __poke_user_per(child, addr, data);
419
420 }
421
422 return 0;
423}
424
425static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
426{
427 addr_t mask;
428
429 /*
430 * Stupid gdb peeks/pokes the access registers in 64 bit with
431 * an alignment of 4. Programmers from hell indeed...
432 */
433 mask = __ADDR_MASK;
434 if (addr >= offsetof(struct user, regs.acrs) &&
435 addr < offsetof(struct user, regs.orig_gpr2))
436 mask = 3;
437 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
438 return -EIO;
439
440 return __poke_user(child, addr, data);
441}
442
443long arch_ptrace(struct task_struct *child, long request,
444 unsigned long addr, unsigned long data)
445{
446 ptrace_area parea;
447 int copied, ret;
448
449 switch (request) {
450 case PTRACE_PEEKUSR:
451 /* read the word at location addr in the USER area. */
452 return peek_user(child, addr, data);
453
454 case PTRACE_POKEUSR:
455 /* write the word at location addr in the USER area */
456 return poke_user(child, addr, data);
457
458 case PTRACE_PEEKUSR_AREA:
459 case PTRACE_POKEUSR_AREA:
460 if (copy_from_user(&parea, (void __force __user *) addr,
461 sizeof(parea)))
462 return -EFAULT;
463 addr = parea.kernel_addr;
464 data = parea.process_addr;
465 copied = 0;
466 while (copied < parea.len) {
467 if (request == PTRACE_PEEKUSR_AREA)
468 ret = peek_user(child, addr, data);
469 else {
470 addr_t utmp;
471 if (get_user(utmp,
472 (addr_t __force __user *) data))
473 return -EFAULT;
474 ret = poke_user(child, addr, utmp);
475 }
476 if (ret)
477 return ret;
478 addr += sizeof(unsigned long);
479 data += sizeof(unsigned long);
480 copied += sizeof(unsigned long);
481 }
482 return 0;
483 case PTRACE_GET_LAST_BREAK:
484 return put_user(child->thread.last_break, (unsigned long __user *)data);
485 case PTRACE_ENABLE_TE:
486 if (!MACHINE_HAS_TE)
487 return -EIO;
488 child->thread.per_flags &= ~PER_FLAG_NO_TE;
489 return 0;
490 case PTRACE_DISABLE_TE:
491 if (!MACHINE_HAS_TE)
492 return -EIO;
493 child->thread.per_flags |= PER_FLAG_NO_TE;
494 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
495 return 0;
496 case PTRACE_TE_ABORT_RAND:
497 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
498 return -EIO;
499 switch (data) {
500 case 0UL:
501 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
502 break;
503 case 1UL:
504 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
505 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
506 break;
507 case 2UL:
508 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
509 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
510 break;
511 default:
512 return -EINVAL;
513 }
514 return 0;
515 default:
516 return ptrace_request(child, request, addr, data);
517 }
518}
519
520#ifdef CONFIG_COMPAT
521/*
522 * Now the fun part starts... a 31 bit program running in the
523 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
524 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
525 * to handle, the difference to the 64 bit versions of the requests
526 * is that the access is done in multiples of 4 byte instead of
527 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
528 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
529 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
530 * is a 31 bit program too, the content of struct user can be
531 * emulated. A 31 bit program peeking into the struct user of
532 * a 64 bit program is a no-no.
533 */
534
535/*
536 * Same as peek_user_per but for a 31 bit program.
537 */
538static inline __u32 __peek_user_per_compat(struct task_struct *child,
539 addr_t addr)
540{
541 if (addr == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, bits))
554 /* Single-step bit. */
555 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
556 0x80000000 : 0;
557 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
558 /* Start address of the user specified per set. */
559 return (__u32) child->thread.per_user.start;
560 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
561 /* End address of the user specified per set. */
562 return (__u32) child->thread.per_user.end;
563 else if (addr == offsetof(struct compat_per_struct_kernel, 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 == offsetof(struct compat_per_struct_kernel, address))
567 /* Address of the last PER trap */
568 return (__u32) child->thread.per_event.address;
569 else if (addr == offsetof(struct compat_per_struct_kernel, 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 addr_t offset;
581 __u32 tmp;
582
583 if (addr < offsetof(struct compat_user, regs.acrs)) {
584 struct pt_regs *regs = task_pt_regs(child);
585 /*
586 * psw and gprs are stored on the stack
587 */
588 if (addr == offsetof(struct compat_user, regs.psw.mask)) {
589 /* Fake a 31 bit psw mask. */
590 tmp = (__u32)(regs->psw.mask >> 32);
591 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
592 tmp |= PSW32_USER_BITS;
593 } else if (addr == offsetof(struct compat_user, regs.psw.addr)) {
594 /* Fake a 31 bit psw address. */
595 tmp = (__u32) regs->psw.addr |
596 (__u32)(regs->psw.mask & PSW_MASK_BA);
597 } else {
598 /* gpr 0-15 */
599 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
600 }
601 } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
602 /*
603 * access registers are stored in the thread structure
604 */
605 offset = addr - offsetof(struct compat_user, regs.acrs);
606 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
607
608 } else if (addr == offsetof(struct compat_user, regs.orig_gpr2)) {
609 /*
610 * orig_gpr2 is stored on the kernel stack
611 */
612 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
613
614 } else if (addr < offsetof(struct compat_user, regs.fp_regs)) {
615 /*
616 * prevent reads of padding hole between
617 * orig_gpr2 and fp_regs on s390.
618 */
619 tmp = 0;
620
621 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
622 /*
623 * floating point control reg. is in the thread structure
624 */
625 tmp = child->thread.fpu.fpc;
626
627 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
628 /*
629 * floating point regs. are either in child->thread.fpu
630 * or the child->thread.fpu.vxrs array
631 */
632 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
633 if (cpu_has_vx())
634 tmp = *(__u32 *)
635 ((addr_t) child->thread.fpu.vxrs + 2*offset);
636 else
637 tmp = *(__u32 *)
638 ((addr_t) child->thread.fpu.fprs + offset);
639
640 } else if (addr < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
641 /*
642 * Handle access to the per_info structure.
643 */
644 addr -= offsetof(struct compat_user, regs.per_info);
645 tmp = __peek_user_per_compat(child, addr);
646
647 } else
648 tmp = 0;
649
650 return tmp;
651}
652
653static int peek_user_compat(struct task_struct *child,
654 addr_t addr, addr_t data)
655{
656 __u32 tmp;
657
658 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
659 return -EIO;
660
661 tmp = __peek_user_compat(child, addr);
662 return put_user(tmp, (__u32 __user *) data);
663}
664
665/*
666 * Same as poke_user_per but for a 31 bit program.
667 */
668static inline void __poke_user_per_compat(struct task_struct *child,
669 addr_t addr, __u32 data)
670{
671 if (addr == offsetof(struct compat_per_struct_kernel, cr9))
672 /* PER event mask of the user specified per set. */
673 child->thread.per_user.control =
674 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
675 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
676 /* Starting address of the user specified per set. */
677 child->thread.per_user.start = data;
678 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
679 /* Ending address of the user specified per set. */
680 child->thread.per_user.end = data;
681}
682
683/*
684 * Same as poke_user but for a 31 bit program.
685 */
686static int __poke_user_compat(struct task_struct *child,
687 addr_t addr, addr_t data)
688{
689 __u32 tmp = (__u32) data;
690 addr_t offset;
691
692 if (addr < offsetof(struct compat_user, regs.acrs)) {
693 struct pt_regs *regs = task_pt_regs(child);
694 /*
695 * psw, gprs, acrs and orig_gpr2 are stored on the stack
696 */
697 if (addr == offsetof(struct compat_user, regs.psw.mask)) {
698 __u32 mask = PSW32_MASK_USER;
699
700 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
701 /* Build a 64 bit psw mask from 31 bit mask. */
702 if ((tmp ^ PSW32_USER_BITS) & ~mask)
703 /* Invalid psw mask. */
704 return -EINVAL;
705 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
706 /* Invalid address-space-control bits */
707 return -EINVAL;
708 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
709 (regs->psw.mask & PSW_MASK_BA) |
710 (__u64)(tmp & mask) << 32;
711 } else if (addr == offsetof(struct compat_user, regs.psw.addr)) {
712 /* Build a 64 bit psw address from 31 bit address. */
713 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
714 /* Transfer 31 bit amode bit to psw mask. */
715 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
716 (__u64)(tmp & PSW32_ADDR_AMODE);
717 } else {
718 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
719 addr == offsetof(struct compat_user, regs.gprs[2])) {
720 struct pt_regs *regs = task_pt_regs(child);
721
722 regs->int_code = 0x20000 | (data & 0xffff);
723 }
724 /* gpr 0-15 */
725 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
726 }
727 } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
728 /*
729 * access registers are stored in the thread structure
730 */
731 offset = addr - offsetof(struct compat_user, regs.acrs);
732 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
733
734 } else if (addr == offsetof(struct compat_user, regs.orig_gpr2)) {
735 /*
736 * orig_gpr2 is stored on the kernel stack
737 */
738 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
739
740 } else if (addr < offsetof(struct compat_user, regs.fp_regs)) {
741 /*
742 * prevent writess of padding hole between
743 * orig_gpr2 and fp_regs on s390.
744 */
745 return 0;
746
747 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
748 /*
749 * floating point control reg. is in the thread structure
750 */
751 child->thread.fpu.fpc = data;
752
753 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
754 /*
755 * floating point regs. are either in child->thread.fpu
756 * or the child->thread.fpu.vxrs array
757 */
758 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
759 if (cpu_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 < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
767 /*
768 * Handle access to the per_info structure.
769 */
770 addr -= offsetof(struct compat_user, 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 return put_user(child->thread.last_break, (unsigned int __user *)data);
831 }
832 return compat_ptrace_request(child, request, addr, data);
833}
834#endif
835
836/*
837 * user_regset definitions.
838 */
839
840static int s390_regs_get(struct task_struct *target,
841 const struct user_regset *regset,
842 struct membuf to)
843{
844 unsigned pos;
845 if (target == current)
846 save_access_regs(target->thread.acrs);
847
848 for (pos = 0; pos < sizeof(s390_regs); pos += sizeof(long))
849 membuf_store(&to, __peek_user(target, pos));
850 return 0;
851}
852
853static int s390_regs_set(struct task_struct *target,
854 const struct user_regset *regset,
855 unsigned int pos, unsigned int count,
856 const void *kbuf, const void __user *ubuf)
857{
858 int rc = 0;
859
860 if (target == current)
861 save_access_regs(target->thread.acrs);
862
863 if (kbuf) {
864 const unsigned long *k = kbuf;
865 while (count > 0 && !rc) {
866 rc = __poke_user(target, pos, *k++);
867 count -= sizeof(*k);
868 pos += sizeof(*k);
869 }
870 } else {
871 const unsigned long __user *u = ubuf;
872 while (count > 0 && !rc) {
873 unsigned long word;
874 rc = __get_user(word, u++);
875 if (rc)
876 break;
877 rc = __poke_user(target, pos, word);
878 count -= sizeof(*u);
879 pos += sizeof(*u);
880 }
881 }
882
883 if (rc == 0 && target == current)
884 restore_access_regs(target->thread.acrs);
885
886 return rc;
887}
888
889static int s390_fpregs_get(struct task_struct *target,
890 const struct user_regset *regset,
891 struct membuf to)
892{
893 _s390_fp_regs fp_regs;
894
895 if (target == current)
896 save_fpu_regs();
897
898 fp_regs.fpc = target->thread.fpu.fpc;
899 fpregs_store(&fp_regs, &target->thread.fpu);
900
901 return membuf_write(&to, &fp_regs, sizeof(fp_regs));
902}
903
904static int s390_fpregs_set(struct task_struct *target,
905 const struct user_regset *regset, unsigned int pos,
906 unsigned int count, const void *kbuf,
907 const void __user *ubuf)
908{
909 int rc = 0;
910 freg_t fprs[__NUM_FPRS];
911
912 if (target == current)
913 save_fpu_regs();
914
915 if (cpu_has_vx())
916 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
917 else
918 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
919
920 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
921 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
922 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
923 0, offsetof(s390_fp_regs, fprs));
924 if (rc)
925 return rc;
926 if (ufpc[1] != 0)
927 return -EINVAL;
928 target->thread.fpu.fpc = ufpc[0];
929 }
930
931 if (rc == 0 && count > 0)
932 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
933 fprs, offsetof(s390_fp_regs, fprs), -1);
934 if (rc)
935 return rc;
936
937 if (cpu_has_vx())
938 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
939 else
940 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
941
942 return rc;
943}
944
945static int s390_last_break_get(struct task_struct *target,
946 const struct user_regset *regset,
947 struct membuf to)
948{
949 return membuf_store(&to, target->thread.last_break);
950}
951
952static int s390_last_break_set(struct task_struct *target,
953 const struct user_regset *regset,
954 unsigned int pos, unsigned int count,
955 const void *kbuf, const void __user *ubuf)
956{
957 return 0;
958}
959
960static int s390_tdb_get(struct task_struct *target,
961 const struct user_regset *regset,
962 struct membuf to)
963{
964 struct pt_regs *regs = task_pt_regs(target);
965 size_t size;
966
967 if (!(regs->int_code & 0x200))
968 return -ENODATA;
969 size = sizeof(target->thread.trap_tdb.data);
970 return membuf_write(&to, target->thread.trap_tdb.data, size);
971}
972
973static int s390_tdb_set(struct task_struct *target,
974 const struct user_regset *regset,
975 unsigned int pos, unsigned int count,
976 const void *kbuf, const void __user *ubuf)
977{
978 return 0;
979}
980
981static int s390_vxrs_low_get(struct task_struct *target,
982 const struct user_regset *regset,
983 struct membuf to)
984{
985 __u64 vxrs[__NUM_VXRS_LOW];
986 int i;
987
988 if (!cpu_has_vx())
989 return -ENODEV;
990 if (target == current)
991 save_fpu_regs();
992 for (i = 0; i < __NUM_VXRS_LOW; i++)
993 vxrs[i] = target->thread.fpu.vxrs[i].low;
994 return membuf_write(&to, vxrs, sizeof(vxrs));
995}
996
997static int s390_vxrs_low_set(struct task_struct *target,
998 const struct user_regset *regset,
999 unsigned int pos, unsigned int count,
1000 const void *kbuf, const void __user *ubuf)
1001{
1002 __u64 vxrs[__NUM_VXRS_LOW];
1003 int i, rc;
1004
1005 if (!cpu_has_vx())
1006 return -ENODEV;
1007 if (target == current)
1008 save_fpu_regs();
1009
1010 for (i = 0; i < __NUM_VXRS_LOW; i++)
1011 vxrs[i] = target->thread.fpu.vxrs[i].low;
1012
1013 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1014 if (rc == 0)
1015 for (i = 0; i < __NUM_VXRS_LOW; i++)
1016 target->thread.fpu.vxrs[i].low = vxrs[i];
1017
1018 return rc;
1019}
1020
1021static int s390_vxrs_high_get(struct task_struct *target,
1022 const struct user_regset *regset,
1023 struct membuf to)
1024{
1025 if (!cpu_has_vx())
1026 return -ENODEV;
1027 if (target == current)
1028 save_fpu_regs();
1029 return membuf_write(&to, target->thread.fpu.vxrs + __NUM_VXRS_LOW,
1030 __NUM_VXRS_HIGH * sizeof(__vector128));
1031}
1032
1033static int s390_vxrs_high_set(struct task_struct *target,
1034 const struct user_regset *regset,
1035 unsigned int pos, unsigned int count,
1036 const void *kbuf, const void __user *ubuf)
1037{
1038 int rc;
1039
1040 if (!cpu_has_vx())
1041 return -ENODEV;
1042 if (target == current)
1043 save_fpu_regs();
1044
1045 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1046 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1047 return rc;
1048}
1049
1050static int s390_system_call_get(struct task_struct *target,
1051 const struct user_regset *regset,
1052 struct membuf to)
1053{
1054 return membuf_store(&to, target->thread.system_call);
1055}
1056
1057static int s390_system_call_set(struct task_struct *target,
1058 const struct user_regset *regset,
1059 unsigned int pos, unsigned int count,
1060 const void *kbuf, const void __user *ubuf)
1061{
1062 unsigned int *data = &target->thread.system_call;
1063 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1064 data, 0, sizeof(unsigned int));
1065}
1066
1067static int s390_gs_cb_get(struct task_struct *target,
1068 const struct user_regset *regset,
1069 struct membuf to)
1070{
1071 struct gs_cb *data = target->thread.gs_cb;
1072
1073 if (!MACHINE_HAS_GS)
1074 return -ENODEV;
1075 if (!data)
1076 return -ENODATA;
1077 if (target == current)
1078 save_gs_cb(data);
1079 return membuf_write(&to, data, sizeof(struct gs_cb));
1080}
1081
1082static int s390_gs_cb_set(struct task_struct *target,
1083 const struct user_regset *regset,
1084 unsigned int pos, unsigned int count,
1085 const void *kbuf, const void __user *ubuf)
1086{
1087 struct gs_cb gs_cb = { }, *data = NULL;
1088 int rc;
1089
1090 if (!MACHINE_HAS_GS)
1091 return -ENODEV;
1092 if (!target->thread.gs_cb) {
1093 data = kzalloc(sizeof(*data), GFP_KERNEL);
1094 if (!data)
1095 return -ENOMEM;
1096 }
1097 if (!target->thread.gs_cb)
1098 gs_cb.gsd = 25;
1099 else if (target == current)
1100 save_gs_cb(&gs_cb);
1101 else
1102 gs_cb = *target->thread.gs_cb;
1103 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1104 &gs_cb, 0, sizeof(gs_cb));
1105 if (rc) {
1106 kfree(data);
1107 return -EFAULT;
1108 }
1109 preempt_disable();
1110 if (!target->thread.gs_cb)
1111 target->thread.gs_cb = data;
1112 *target->thread.gs_cb = gs_cb;
1113 if (target == current) {
1114 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
1115 restore_gs_cb(target->thread.gs_cb);
1116 }
1117 preempt_enable();
1118 return rc;
1119}
1120
1121static int s390_gs_bc_get(struct task_struct *target,
1122 const struct user_regset *regset,
1123 struct membuf to)
1124{
1125 struct gs_cb *data = target->thread.gs_bc_cb;
1126
1127 if (!MACHINE_HAS_GS)
1128 return -ENODEV;
1129 if (!data)
1130 return -ENODATA;
1131 return membuf_write(&to, data, sizeof(struct gs_cb));
1132}
1133
1134static int s390_gs_bc_set(struct task_struct *target,
1135 const struct user_regset *regset,
1136 unsigned int pos, unsigned int count,
1137 const void *kbuf, const void __user *ubuf)
1138{
1139 struct gs_cb *data = target->thread.gs_bc_cb;
1140
1141 if (!MACHINE_HAS_GS)
1142 return -ENODEV;
1143 if (!data) {
1144 data = kzalloc(sizeof(*data), GFP_KERNEL);
1145 if (!data)
1146 return -ENOMEM;
1147 target->thread.gs_bc_cb = data;
1148 }
1149 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1150 data, 0, sizeof(struct gs_cb));
1151}
1152
1153static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
1154{
1155 return (cb->rca & 0x1f) == 0 &&
1156 (cb->roa & 0xfff) == 0 &&
1157 (cb->rla & 0xfff) == 0xfff &&
1158 cb->s == 1 &&
1159 cb->k == 1 &&
1160 cb->h == 0 &&
1161 cb->reserved1 == 0 &&
1162 cb->ps == 1 &&
1163 cb->qs == 0 &&
1164 cb->pc == 1 &&
1165 cb->qc == 0 &&
1166 cb->reserved2 == 0 &&
1167 cb->reserved3 == 0 &&
1168 cb->reserved4 == 0 &&
1169 cb->reserved5 == 0 &&
1170 cb->reserved6 == 0 &&
1171 cb->reserved7 == 0 &&
1172 cb->reserved8 == 0 &&
1173 cb->rla >= cb->roa &&
1174 cb->rca >= cb->roa &&
1175 cb->rca <= cb->rla+1 &&
1176 cb->m < 3;
1177}
1178
1179static int s390_runtime_instr_get(struct task_struct *target,
1180 const struct user_regset *regset,
1181 struct membuf to)
1182{
1183 struct runtime_instr_cb *data = target->thread.ri_cb;
1184
1185 if (!test_facility(64))
1186 return -ENODEV;
1187 if (!data)
1188 return -ENODATA;
1189
1190 return membuf_write(&to, data, sizeof(struct runtime_instr_cb));
1191}
1192
1193static int s390_runtime_instr_set(struct task_struct *target,
1194 const struct user_regset *regset,
1195 unsigned int pos, unsigned int count,
1196 const void *kbuf, const void __user *ubuf)
1197{
1198 struct runtime_instr_cb ri_cb = { }, *data = NULL;
1199 int rc;
1200
1201 if (!test_facility(64))
1202 return -ENODEV;
1203
1204 if (!target->thread.ri_cb) {
1205 data = kzalloc(sizeof(*data), GFP_KERNEL);
1206 if (!data)
1207 return -ENOMEM;
1208 }
1209
1210 if (target->thread.ri_cb) {
1211 if (target == current)
1212 store_runtime_instr_cb(&ri_cb);
1213 else
1214 ri_cb = *target->thread.ri_cb;
1215 }
1216
1217 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1218 &ri_cb, 0, sizeof(struct runtime_instr_cb));
1219 if (rc) {
1220 kfree(data);
1221 return -EFAULT;
1222 }
1223
1224 if (!is_ri_cb_valid(&ri_cb)) {
1225 kfree(data);
1226 return -EINVAL;
1227 }
1228 /*
1229 * Override access key in any case, since user space should
1230 * not be able to set it, nor should it care about it.
1231 */
1232 ri_cb.key = PAGE_DEFAULT_KEY >> 4;
1233 preempt_disable();
1234 if (!target->thread.ri_cb)
1235 target->thread.ri_cb = data;
1236 *target->thread.ri_cb = ri_cb;
1237 if (target == current)
1238 load_runtime_instr_cb(target->thread.ri_cb);
1239 preempt_enable();
1240
1241 return 0;
1242}
1243
1244static const struct user_regset s390_regsets[] = {
1245 {
1246 .core_note_type = NT_PRSTATUS,
1247 .n = sizeof(s390_regs) / sizeof(long),
1248 .size = sizeof(long),
1249 .align = sizeof(long),
1250 .regset_get = s390_regs_get,
1251 .set = s390_regs_set,
1252 },
1253 {
1254 .core_note_type = NT_PRFPREG,
1255 .n = sizeof(s390_fp_regs) / sizeof(long),
1256 .size = sizeof(long),
1257 .align = sizeof(long),
1258 .regset_get = s390_fpregs_get,
1259 .set = s390_fpregs_set,
1260 },
1261 {
1262 .core_note_type = NT_S390_SYSTEM_CALL,
1263 .n = 1,
1264 .size = sizeof(unsigned int),
1265 .align = sizeof(unsigned int),
1266 .regset_get = s390_system_call_get,
1267 .set = s390_system_call_set,
1268 },
1269 {
1270 .core_note_type = NT_S390_LAST_BREAK,
1271 .n = 1,
1272 .size = sizeof(long),
1273 .align = sizeof(long),
1274 .regset_get = s390_last_break_get,
1275 .set = s390_last_break_set,
1276 },
1277 {
1278 .core_note_type = NT_S390_TDB,
1279 .n = 1,
1280 .size = 256,
1281 .align = 1,
1282 .regset_get = s390_tdb_get,
1283 .set = s390_tdb_set,
1284 },
1285 {
1286 .core_note_type = NT_S390_VXRS_LOW,
1287 .n = __NUM_VXRS_LOW,
1288 .size = sizeof(__u64),
1289 .align = sizeof(__u64),
1290 .regset_get = s390_vxrs_low_get,
1291 .set = s390_vxrs_low_set,
1292 },
1293 {
1294 .core_note_type = NT_S390_VXRS_HIGH,
1295 .n = __NUM_VXRS_HIGH,
1296 .size = sizeof(__vector128),
1297 .align = sizeof(__vector128),
1298 .regset_get = s390_vxrs_high_get,
1299 .set = s390_vxrs_high_set,
1300 },
1301 {
1302 .core_note_type = NT_S390_GS_CB,
1303 .n = sizeof(struct gs_cb) / sizeof(__u64),
1304 .size = sizeof(__u64),
1305 .align = sizeof(__u64),
1306 .regset_get = s390_gs_cb_get,
1307 .set = s390_gs_cb_set,
1308 },
1309 {
1310 .core_note_type = NT_S390_GS_BC,
1311 .n = sizeof(struct gs_cb) / sizeof(__u64),
1312 .size = sizeof(__u64),
1313 .align = sizeof(__u64),
1314 .regset_get = s390_gs_bc_get,
1315 .set = s390_gs_bc_set,
1316 },
1317 {
1318 .core_note_type = NT_S390_RI_CB,
1319 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1320 .size = sizeof(__u64),
1321 .align = sizeof(__u64),
1322 .regset_get = s390_runtime_instr_get,
1323 .set = s390_runtime_instr_set,
1324 },
1325};
1326
1327static const struct user_regset_view user_s390_view = {
1328 .name = "s390x",
1329 .e_machine = EM_S390,
1330 .regsets = s390_regsets,
1331 .n = ARRAY_SIZE(s390_regsets)
1332};
1333
1334#ifdef CONFIG_COMPAT
1335static int s390_compat_regs_get(struct task_struct *target,
1336 const struct user_regset *regset,
1337 struct membuf to)
1338{
1339 unsigned n;
1340
1341 if (target == current)
1342 save_access_regs(target->thread.acrs);
1343
1344 for (n = 0; n < sizeof(s390_compat_regs); n += sizeof(compat_ulong_t))
1345 membuf_store(&to, __peek_user_compat(target, n));
1346 return 0;
1347}
1348
1349static int s390_compat_regs_set(struct task_struct *target,
1350 const struct user_regset *regset,
1351 unsigned int pos, unsigned int count,
1352 const void *kbuf, const void __user *ubuf)
1353{
1354 int rc = 0;
1355
1356 if (target == current)
1357 save_access_regs(target->thread.acrs);
1358
1359 if (kbuf) {
1360 const compat_ulong_t *k = kbuf;
1361 while (count > 0 && !rc) {
1362 rc = __poke_user_compat(target, pos, *k++);
1363 count -= sizeof(*k);
1364 pos += sizeof(*k);
1365 }
1366 } else {
1367 const compat_ulong_t __user *u = ubuf;
1368 while (count > 0 && !rc) {
1369 compat_ulong_t word;
1370 rc = __get_user(word, u++);
1371 if (rc)
1372 break;
1373 rc = __poke_user_compat(target, pos, word);
1374 count -= sizeof(*u);
1375 pos += sizeof(*u);
1376 }
1377 }
1378
1379 if (rc == 0 && target == current)
1380 restore_access_regs(target->thread.acrs);
1381
1382 return rc;
1383}
1384
1385static int s390_compat_regs_high_get(struct task_struct *target,
1386 const struct user_regset *regset,
1387 struct membuf to)
1388{
1389 compat_ulong_t *gprs_high;
1390 int i;
1391
1392 gprs_high = (compat_ulong_t *)task_pt_regs(target)->gprs;
1393 for (i = 0; i < NUM_GPRS; i++, gprs_high += 2)
1394 membuf_store(&to, *gprs_high);
1395 return 0;
1396}
1397
1398static int s390_compat_regs_high_set(struct task_struct *target,
1399 const struct user_regset *regset,
1400 unsigned int pos, unsigned int count,
1401 const void *kbuf, const void __user *ubuf)
1402{
1403 compat_ulong_t *gprs_high;
1404 int rc = 0;
1405
1406 gprs_high = (compat_ulong_t *)
1407 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1408 if (kbuf) {
1409 const compat_ulong_t *k = kbuf;
1410 while (count > 0) {
1411 *gprs_high = *k++;
1412 *gprs_high += 2;
1413 count -= sizeof(*k);
1414 }
1415 } else {
1416 const compat_ulong_t __user *u = ubuf;
1417 while (count > 0 && !rc) {
1418 unsigned long word;
1419 rc = __get_user(word, u++);
1420 if (rc)
1421 break;
1422 *gprs_high = word;
1423 *gprs_high += 2;
1424 count -= sizeof(*u);
1425 }
1426 }
1427
1428 return rc;
1429}
1430
1431static int s390_compat_last_break_get(struct task_struct *target,
1432 const struct user_regset *regset,
1433 struct membuf to)
1434{
1435 compat_ulong_t last_break = target->thread.last_break;
1436
1437 return membuf_store(&to, (unsigned long)last_break);
1438}
1439
1440static int s390_compat_last_break_set(struct task_struct *target,
1441 const struct user_regset *regset,
1442 unsigned int pos, unsigned int count,
1443 const void *kbuf, const void __user *ubuf)
1444{
1445 return 0;
1446}
1447
1448static const struct user_regset s390_compat_regsets[] = {
1449 {
1450 .core_note_type = NT_PRSTATUS,
1451 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1452 .size = sizeof(compat_long_t),
1453 .align = sizeof(compat_long_t),
1454 .regset_get = s390_compat_regs_get,
1455 .set = s390_compat_regs_set,
1456 },
1457 {
1458 .core_note_type = NT_PRFPREG,
1459 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1460 .size = sizeof(compat_long_t),
1461 .align = sizeof(compat_long_t),
1462 .regset_get = s390_fpregs_get,
1463 .set = s390_fpregs_set,
1464 },
1465 {
1466 .core_note_type = NT_S390_SYSTEM_CALL,
1467 .n = 1,
1468 .size = sizeof(compat_uint_t),
1469 .align = sizeof(compat_uint_t),
1470 .regset_get = s390_system_call_get,
1471 .set = s390_system_call_set,
1472 },
1473 {
1474 .core_note_type = NT_S390_LAST_BREAK,
1475 .n = 1,
1476 .size = sizeof(long),
1477 .align = sizeof(long),
1478 .regset_get = s390_compat_last_break_get,
1479 .set = s390_compat_last_break_set,
1480 },
1481 {
1482 .core_note_type = NT_S390_TDB,
1483 .n = 1,
1484 .size = 256,
1485 .align = 1,
1486 .regset_get = s390_tdb_get,
1487 .set = s390_tdb_set,
1488 },
1489 {
1490 .core_note_type = NT_S390_VXRS_LOW,
1491 .n = __NUM_VXRS_LOW,
1492 .size = sizeof(__u64),
1493 .align = sizeof(__u64),
1494 .regset_get = s390_vxrs_low_get,
1495 .set = s390_vxrs_low_set,
1496 },
1497 {
1498 .core_note_type = NT_S390_VXRS_HIGH,
1499 .n = __NUM_VXRS_HIGH,
1500 .size = sizeof(__vector128),
1501 .align = sizeof(__vector128),
1502 .regset_get = s390_vxrs_high_get,
1503 .set = s390_vxrs_high_set,
1504 },
1505 {
1506 .core_note_type = NT_S390_HIGH_GPRS,
1507 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1508 .size = sizeof(compat_long_t),
1509 .align = sizeof(compat_long_t),
1510 .regset_get = s390_compat_regs_high_get,
1511 .set = s390_compat_regs_high_set,
1512 },
1513 {
1514 .core_note_type = NT_S390_GS_CB,
1515 .n = sizeof(struct gs_cb) / sizeof(__u64),
1516 .size = sizeof(__u64),
1517 .align = sizeof(__u64),
1518 .regset_get = s390_gs_cb_get,
1519 .set = s390_gs_cb_set,
1520 },
1521 {
1522 .core_note_type = NT_S390_GS_BC,
1523 .n = sizeof(struct gs_cb) / sizeof(__u64),
1524 .size = sizeof(__u64),
1525 .align = sizeof(__u64),
1526 .regset_get = s390_gs_bc_get,
1527 .set = s390_gs_bc_set,
1528 },
1529 {
1530 .core_note_type = NT_S390_RI_CB,
1531 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1532 .size = sizeof(__u64),
1533 .align = sizeof(__u64),
1534 .regset_get = s390_runtime_instr_get,
1535 .set = s390_runtime_instr_set,
1536 },
1537};
1538
1539static const struct user_regset_view user_s390_compat_view = {
1540 .name = "s390",
1541 .e_machine = EM_S390,
1542 .regsets = s390_compat_regsets,
1543 .n = ARRAY_SIZE(s390_compat_regsets)
1544};
1545#endif
1546
1547const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1548{
1549#ifdef CONFIG_COMPAT
1550 if (test_tsk_thread_flag(task, TIF_31BIT))
1551 return &user_s390_compat_view;
1552#endif
1553 return &user_s390_view;
1554}
1555
1556static const char *gpr_names[NUM_GPRS] = {
1557 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1558 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1559};
1560
1561unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1562{
1563 if (offset >= NUM_GPRS)
1564 return 0;
1565 return regs->gprs[offset];
1566}
1567
1568int regs_query_register_offset(const char *name)
1569{
1570 unsigned long offset;
1571
1572 if (!name || *name != 'r')
1573 return -EINVAL;
1574 if (kstrtoul(name + 1, 10, &offset))
1575 return -EINVAL;
1576 if (offset >= NUM_GPRS)
1577 return -EINVAL;
1578 return offset;
1579}
1580
1581const char *regs_query_register_name(unsigned int offset)
1582{
1583 if (offset >= NUM_GPRS)
1584 return NULL;
1585 return gpr_names[offset];
1586}
1587
1588static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1589{
1590 unsigned long ksp = kernel_stack_pointer(regs);
1591
1592 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1593}
1594
1595/**
1596 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1597 * @regs:pt_regs which contains kernel stack pointer.
1598 * @n:stack entry number.
1599 *
1600 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1601 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1602 * this returns 0.
1603 */
1604unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1605{
1606 unsigned long addr;
1607
1608 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1609 if (!regs_within_kernel_stack(regs, addr))
1610 return 0;
1611 return *(unsigned long *)addr;
1612}
1/*
2 * Ptrace user space interface.
3 *
4 * Copyright IBM Corp. 1999, 2010
5 * Author(s): Denis Joseph Barrow
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/errno.h>
14#include <linux/ptrace.h>
15#include <linux/user.h>
16#include <linux/security.h>
17#include <linux/audit.h>
18#include <linux/signal.h>
19#include <linux/elf.h>
20#include <linux/regset.h>
21#include <linux/tracehook.h>
22#include <linux/seccomp.h>
23#include <linux/compat.h>
24#include <trace/syscall.h>
25#include <asm/segment.h>
26#include <asm/page.h>
27#include <asm/pgtable.h>
28#include <asm/pgalloc.h>
29#include <asm/uaccess.h>
30#include <asm/unistd.h>
31#include <asm/switch_to.h>
32#include "entry.h"
33
34#ifdef CONFIG_COMPAT
35#include "compat_ptrace.h"
36#endif
37
38#define CREATE_TRACE_POINTS
39#include <trace/events/syscalls.h>
40
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(task_thread_info(child)->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(task_thread_info(child)->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 long ret = 0;
825
826 /* Do the secure computing check first. */
827 if (secure_computing()) {
828 /* seccomp failures shouldn't expose any additional code. */
829 ret = -1;
830 goto out;
831 }
832
833 /*
834 * The sysc_tracesys code in entry.S stored the system
835 * call number to gprs[2].
836 */
837 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
838 (tracehook_report_syscall_entry(regs) ||
839 regs->gprs[2] >= NR_syscalls)) {
840 /*
841 * Tracing decided this syscall should not happen or the
842 * debugger stored an invalid system call number. Skip
843 * the system call and the system call restart handling.
844 */
845 clear_pt_regs_flag(regs, PIF_SYSCALL);
846 ret = -1;
847 }
848
849 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
850 trace_sys_enter(regs, regs->gprs[2]);
851
852 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2,
853 regs->gprs[3], regs->gprs[4],
854 regs->gprs[5]);
855out:
856 return ret ?: regs->gprs[2];
857}
858
859asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
860{
861 audit_syscall_exit(regs);
862
863 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
864 trace_sys_exit(regs, regs->gprs[2]);
865
866 if (test_thread_flag(TIF_SYSCALL_TRACE))
867 tracehook_report_syscall_exit(regs, 0);
868}
869
870/*
871 * user_regset definitions.
872 */
873
874static int s390_regs_get(struct task_struct *target,
875 const struct user_regset *regset,
876 unsigned int pos, unsigned int count,
877 void *kbuf, void __user *ubuf)
878{
879 if (target == current)
880 save_access_regs(target->thread.acrs);
881
882 if (kbuf) {
883 unsigned long *k = kbuf;
884 while (count > 0) {
885 *k++ = __peek_user(target, pos);
886 count -= sizeof(*k);
887 pos += sizeof(*k);
888 }
889 } else {
890 unsigned long __user *u = ubuf;
891 while (count > 0) {
892 if (__put_user(__peek_user(target, pos), u++))
893 return -EFAULT;
894 count -= sizeof(*u);
895 pos += sizeof(*u);
896 }
897 }
898 return 0;
899}
900
901static int s390_regs_set(struct task_struct *target,
902 const struct user_regset *regset,
903 unsigned int pos, unsigned int count,
904 const void *kbuf, const void __user *ubuf)
905{
906 int rc = 0;
907
908 if (target == current)
909 save_access_regs(target->thread.acrs);
910
911 if (kbuf) {
912 const unsigned long *k = kbuf;
913 while (count > 0 && !rc) {
914 rc = __poke_user(target, pos, *k++);
915 count -= sizeof(*k);
916 pos += sizeof(*k);
917 }
918 } else {
919 const unsigned long __user *u = ubuf;
920 while (count > 0 && !rc) {
921 unsigned long word;
922 rc = __get_user(word, u++);
923 if (rc)
924 break;
925 rc = __poke_user(target, pos, word);
926 count -= sizeof(*u);
927 pos += sizeof(*u);
928 }
929 }
930
931 if (rc == 0 && target == current)
932 restore_access_regs(target->thread.acrs);
933
934 return rc;
935}
936
937static int s390_fpregs_get(struct task_struct *target,
938 const struct user_regset *regset, unsigned int pos,
939 unsigned int count, void *kbuf, void __user *ubuf)
940{
941 _s390_fp_regs fp_regs;
942
943 if (target == current)
944 save_fpu_regs();
945
946 fp_regs.fpc = target->thread.fpu.fpc;
947 fpregs_store(&fp_regs, &target->thread.fpu);
948
949 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
950 &fp_regs, 0, -1);
951}
952
953static int s390_fpregs_set(struct task_struct *target,
954 const struct user_regset *regset, unsigned int pos,
955 unsigned int count, const void *kbuf,
956 const void __user *ubuf)
957{
958 int rc = 0;
959 freg_t fprs[__NUM_FPRS];
960
961 if (target == current)
962 save_fpu_regs();
963
964 /* If setting FPC, must validate it first. */
965 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
966 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
967 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
968 0, offsetof(s390_fp_regs, fprs));
969 if (rc)
970 return rc;
971 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
972 return -EINVAL;
973 target->thread.fpu.fpc = ufpc[0];
974 }
975
976 if (rc == 0 && count > 0)
977 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
978 fprs, offsetof(s390_fp_regs, fprs), -1);
979 if (rc)
980 return rc;
981
982 if (MACHINE_HAS_VX)
983 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
984 else
985 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
986
987 return rc;
988}
989
990static int s390_last_break_get(struct task_struct *target,
991 const struct user_regset *regset,
992 unsigned int pos, unsigned int count,
993 void *kbuf, void __user *ubuf)
994{
995 if (count > 0) {
996 if (kbuf) {
997 unsigned long *k = kbuf;
998 *k = task_thread_info(target)->last_break;
999 } else {
1000 unsigned long __user *u = ubuf;
1001 if (__put_user(task_thread_info(target)->last_break, u))
1002 return -EFAULT;
1003 }
1004 }
1005 return 0;
1006}
1007
1008static int s390_last_break_set(struct task_struct *target,
1009 const struct user_regset *regset,
1010 unsigned int pos, unsigned int count,
1011 const void *kbuf, const void __user *ubuf)
1012{
1013 return 0;
1014}
1015
1016static int s390_tdb_get(struct task_struct *target,
1017 const struct user_regset *regset,
1018 unsigned int pos, unsigned int count,
1019 void *kbuf, void __user *ubuf)
1020{
1021 struct pt_regs *regs = task_pt_regs(target);
1022 unsigned char *data;
1023
1024 if (!(regs->int_code & 0x200))
1025 return -ENODATA;
1026 data = target->thread.trap_tdb;
1027 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1028}
1029
1030static int s390_tdb_set(struct task_struct *target,
1031 const struct user_regset *regset,
1032 unsigned int pos, unsigned int count,
1033 const void *kbuf, const void __user *ubuf)
1034{
1035 return 0;
1036}
1037
1038static int s390_vxrs_low_get(struct task_struct *target,
1039 const struct user_regset *regset,
1040 unsigned int pos, unsigned int count,
1041 void *kbuf, void __user *ubuf)
1042{
1043 __u64 vxrs[__NUM_VXRS_LOW];
1044 int i;
1045
1046 if (!MACHINE_HAS_VX)
1047 return -ENODEV;
1048 if (target == current)
1049 save_fpu_regs();
1050 for (i = 0; i < __NUM_VXRS_LOW; i++)
1051 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1052 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1053}
1054
1055static int s390_vxrs_low_set(struct task_struct *target,
1056 const struct user_regset *regset,
1057 unsigned int pos, unsigned int count,
1058 const void *kbuf, const void __user *ubuf)
1059{
1060 __u64 vxrs[__NUM_VXRS_LOW];
1061 int i, rc;
1062
1063 if (!MACHINE_HAS_VX)
1064 return -ENODEV;
1065 if (target == current)
1066 save_fpu_regs();
1067
1068 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1069 if (rc == 0)
1070 for (i = 0; i < __NUM_VXRS_LOW; i++)
1071 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1072
1073 return rc;
1074}
1075
1076static int s390_vxrs_high_get(struct task_struct *target,
1077 const struct user_regset *regset,
1078 unsigned int pos, unsigned int count,
1079 void *kbuf, void __user *ubuf)
1080{
1081 __vector128 vxrs[__NUM_VXRS_HIGH];
1082
1083 if (!MACHINE_HAS_VX)
1084 return -ENODEV;
1085 if (target == current)
1086 save_fpu_regs();
1087 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1088
1089 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1090}
1091
1092static int s390_vxrs_high_set(struct task_struct *target,
1093 const struct user_regset *regset,
1094 unsigned int pos, unsigned int count,
1095 const void *kbuf, const void __user *ubuf)
1096{
1097 int rc;
1098
1099 if (!MACHINE_HAS_VX)
1100 return -ENODEV;
1101 if (target == current)
1102 save_fpu_regs();
1103
1104 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1105 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1106 return rc;
1107}
1108
1109static int s390_system_call_get(struct task_struct *target,
1110 const struct user_regset *regset,
1111 unsigned int pos, unsigned int count,
1112 void *kbuf, void __user *ubuf)
1113{
1114 unsigned int *data = &task_thread_info(target)->system_call;
1115 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1116 data, 0, sizeof(unsigned int));
1117}
1118
1119static int s390_system_call_set(struct task_struct *target,
1120 const struct user_regset *regset,
1121 unsigned int pos, unsigned int count,
1122 const void *kbuf, const void __user *ubuf)
1123{
1124 unsigned int *data = &task_thread_info(target)->system_call;
1125 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1126 data, 0, sizeof(unsigned int));
1127}
1128
1129static const struct user_regset s390_regsets[] = {
1130 {
1131 .core_note_type = NT_PRSTATUS,
1132 .n = sizeof(s390_regs) / sizeof(long),
1133 .size = sizeof(long),
1134 .align = sizeof(long),
1135 .get = s390_regs_get,
1136 .set = s390_regs_set,
1137 },
1138 {
1139 .core_note_type = NT_PRFPREG,
1140 .n = sizeof(s390_fp_regs) / sizeof(long),
1141 .size = sizeof(long),
1142 .align = sizeof(long),
1143 .get = s390_fpregs_get,
1144 .set = s390_fpregs_set,
1145 },
1146 {
1147 .core_note_type = NT_S390_SYSTEM_CALL,
1148 .n = 1,
1149 .size = sizeof(unsigned int),
1150 .align = sizeof(unsigned int),
1151 .get = s390_system_call_get,
1152 .set = s390_system_call_set,
1153 },
1154 {
1155 .core_note_type = NT_S390_LAST_BREAK,
1156 .n = 1,
1157 .size = sizeof(long),
1158 .align = sizeof(long),
1159 .get = s390_last_break_get,
1160 .set = s390_last_break_set,
1161 },
1162 {
1163 .core_note_type = NT_S390_TDB,
1164 .n = 1,
1165 .size = 256,
1166 .align = 1,
1167 .get = s390_tdb_get,
1168 .set = s390_tdb_set,
1169 },
1170 {
1171 .core_note_type = NT_S390_VXRS_LOW,
1172 .n = __NUM_VXRS_LOW,
1173 .size = sizeof(__u64),
1174 .align = sizeof(__u64),
1175 .get = s390_vxrs_low_get,
1176 .set = s390_vxrs_low_set,
1177 },
1178 {
1179 .core_note_type = NT_S390_VXRS_HIGH,
1180 .n = __NUM_VXRS_HIGH,
1181 .size = sizeof(__vector128),
1182 .align = sizeof(__vector128),
1183 .get = s390_vxrs_high_get,
1184 .set = s390_vxrs_high_set,
1185 },
1186};
1187
1188static const struct user_regset_view user_s390_view = {
1189 .name = UTS_MACHINE,
1190 .e_machine = EM_S390,
1191 .regsets = s390_regsets,
1192 .n = ARRAY_SIZE(s390_regsets)
1193};
1194
1195#ifdef CONFIG_COMPAT
1196static int s390_compat_regs_get(struct task_struct *target,
1197 const struct user_regset *regset,
1198 unsigned int pos, unsigned int count,
1199 void *kbuf, void __user *ubuf)
1200{
1201 if (target == current)
1202 save_access_regs(target->thread.acrs);
1203
1204 if (kbuf) {
1205 compat_ulong_t *k = kbuf;
1206 while (count > 0) {
1207 *k++ = __peek_user_compat(target, pos);
1208 count -= sizeof(*k);
1209 pos += sizeof(*k);
1210 }
1211 } else {
1212 compat_ulong_t __user *u = ubuf;
1213 while (count > 0) {
1214 if (__put_user(__peek_user_compat(target, pos), u++))
1215 return -EFAULT;
1216 count -= sizeof(*u);
1217 pos += sizeof(*u);
1218 }
1219 }
1220 return 0;
1221}
1222
1223static int s390_compat_regs_set(struct task_struct *target,
1224 const struct user_regset *regset,
1225 unsigned int pos, unsigned int count,
1226 const void *kbuf, const void __user *ubuf)
1227{
1228 int rc = 0;
1229
1230 if (target == current)
1231 save_access_regs(target->thread.acrs);
1232
1233 if (kbuf) {
1234 const compat_ulong_t *k = kbuf;
1235 while (count > 0 && !rc) {
1236 rc = __poke_user_compat(target, pos, *k++);
1237 count -= sizeof(*k);
1238 pos += sizeof(*k);
1239 }
1240 } else {
1241 const compat_ulong_t __user *u = ubuf;
1242 while (count > 0 && !rc) {
1243 compat_ulong_t word;
1244 rc = __get_user(word, u++);
1245 if (rc)
1246 break;
1247 rc = __poke_user_compat(target, pos, word);
1248 count -= sizeof(*u);
1249 pos += sizeof(*u);
1250 }
1251 }
1252
1253 if (rc == 0 && target == current)
1254 restore_access_regs(target->thread.acrs);
1255
1256 return rc;
1257}
1258
1259static int s390_compat_regs_high_get(struct task_struct *target,
1260 const struct user_regset *regset,
1261 unsigned int pos, unsigned int count,
1262 void *kbuf, void __user *ubuf)
1263{
1264 compat_ulong_t *gprs_high;
1265
1266 gprs_high = (compat_ulong_t *)
1267 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1268 if (kbuf) {
1269 compat_ulong_t *k = kbuf;
1270 while (count > 0) {
1271 *k++ = *gprs_high;
1272 gprs_high += 2;
1273 count -= sizeof(*k);
1274 }
1275 } else {
1276 compat_ulong_t __user *u = ubuf;
1277 while (count > 0) {
1278 if (__put_user(*gprs_high, u++))
1279 return -EFAULT;
1280 gprs_high += 2;
1281 count -= sizeof(*u);
1282 }
1283 }
1284 return 0;
1285}
1286
1287static int s390_compat_regs_high_set(struct task_struct *target,
1288 const struct user_regset *regset,
1289 unsigned int pos, unsigned int count,
1290 const void *kbuf, const void __user *ubuf)
1291{
1292 compat_ulong_t *gprs_high;
1293 int rc = 0;
1294
1295 gprs_high = (compat_ulong_t *)
1296 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1297 if (kbuf) {
1298 const compat_ulong_t *k = kbuf;
1299 while (count > 0) {
1300 *gprs_high = *k++;
1301 *gprs_high += 2;
1302 count -= sizeof(*k);
1303 }
1304 } else {
1305 const compat_ulong_t __user *u = ubuf;
1306 while (count > 0 && !rc) {
1307 unsigned long word;
1308 rc = __get_user(word, u++);
1309 if (rc)
1310 break;
1311 *gprs_high = word;
1312 *gprs_high += 2;
1313 count -= sizeof(*u);
1314 }
1315 }
1316
1317 return rc;
1318}
1319
1320static int s390_compat_last_break_get(struct task_struct *target,
1321 const struct user_regset *regset,
1322 unsigned int pos, unsigned int count,
1323 void *kbuf, void __user *ubuf)
1324{
1325 compat_ulong_t last_break;
1326
1327 if (count > 0) {
1328 last_break = task_thread_info(target)->last_break;
1329 if (kbuf) {
1330 unsigned long *k = kbuf;
1331 *k = last_break;
1332 } else {
1333 unsigned long __user *u = ubuf;
1334 if (__put_user(last_break, u))
1335 return -EFAULT;
1336 }
1337 }
1338 return 0;
1339}
1340
1341static int s390_compat_last_break_set(struct task_struct *target,
1342 const struct user_regset *regset,
1343 unsigned int pos, unsigned int count,
1344 const void *kbuf, const void __user *ubuf)
1345{
1346 return 0;
1347}
1348
1349static const struct user_regset s390_compat_regsets[] = {
1350 {
1351 .core_note_type = NT_PRSTATUS,
1352 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1353 .size = sizeof(compat_long_t),
1354 .align = sizeof(compat_long_t),
1355 .get = s390_compat_regs_get,
1356 .set = s390_compat_regs_set,
1357 },
1358 {
1359 .core_note_type = NT_PRFPREG,
1360 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1361 .size = sizeof(compat_long_t),
1362 .align = sizeof(compat_long_t),
1363 .get = s390_fpregs_get,
1364 .set = s390_fpregs_set,
1365 },
1366 {
1367 .core_note_type = NT_S390_SYSTEM_CALL,
1368 .n = 1,
1369 .size = sizeof(compat_uint_t),
1370 .align = sizeof(compat_uint_t),
1371 .get = s390_system_call_get,
1372 .set = s390_system_call_set,
1373 },
1374 {
1375 .core_note_type = NT_S390_LAST_BREAK,
1376 .n = 1,
1377 .size = sizeof(long),
1378 .align = sizeof(long),
1379 .get = s390_compat_last_break_get,
1380 .set = s390_compat_last_break_set,
1381 },
1382 {
1383 .core_note_type = NT_S390_TDB,
1384 .n = 1,
1385 .size = 256,
1386 .align = 1,
1387 .get = s390_tdb_get,
1388 .set = s390_tdb_set,
1389 },
1390 {
1391 .core_note_type = NT_S390_VXRS_LOW,
1392 .n = __NUM_VXRS_LOW,
1393 .size = sizeof(__u64),
1394 .align = sizeof(__u64),
1395 .get = s390_vxrs_low_get,
1396 .set = s390_vxrs_low_set,
1397 },
1398 {
1399 .core_note_type = NT_S390_VXRS_HIGH,
1400 .n = __NUM_VXRS_HIGH,
1401 .size = sizeof(__vector128),
1402 .align = sizeof(__vector128),
1403 .get = s390_vxrs_high_get,
1404 .set = s390_vxrs_high_set,
1405 },
1406 {
1407 .core_note_type = NT_S390_HIGH_GPRS,
1408 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1409 .size = sizeof(compat_long_t),
1410 .align = sizeof(compat_long_t),
1411 .get = s390_compat_regs_high_get,
1412 .set = s390_compat_regs_high_set,
1413 },
1414};
1415
1416static const struct user_regset_view user_s390_compat_view = {
1417 .name = "s390",
1418 .e_machine = EM_S390,
1419 .regsets = s390_compat_regsets,
1420 .n = ARRAY_SIZE(s390_compat_regsets)
1421};
1422#endif
1423
1424const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1425{
1426#ifdef CONFIG_COMPAT
1427 if (test_tsk_thread_flag(task, TIF_31BIT))
1428 return &user_s390_compat_view;
1429#endif
1430 return &user_s390_view;
1431}
1432
1433static const char *gpr_names[NUM_GPRS] = {
1434 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1435 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1436};
1437
1438unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1439{
1440 if (offset >= NUM_GPRS)
1441 return 0;
1442 return regs->gprs[offset];
1443}
1444
1445int regs_query_register_offset(const char *name)
1446{
1447 unsigned long offset;
1448
1449 if (!name || *name != 'r')
1450 return -EINVAL;
1451 if (kstrtoul(name + 1, 10, &offset))
1452 return -EINVAL;
1453 if (offset >= NUM_GPRS)
1454 return -EINVAL;
1455 return offset;
1456}
1457
1458const char *regs_query_register_name(unsigned int offset)
1459{
1460 if (offset >= NUM_GPRS)
1461 return NULL;
1462 return gpr_names[offset];
1463}
1464
1465static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1466{
1467 unsigned long ksp = kernel_stack_pointer(regs);
1468
1469 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1470}
1471
1472/**
1473 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1474 * @regs:pt_regs which contains kernel stack pointer.
1475 * @n:stack entry number.
1476 *
1477 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1478 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1479 * this returns 0.
1480 */
1481unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1482{
1483 unsigned long addr;
1484
1485 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1486 if (!regs_within_kernel_stack(regs, addr))
1487 return 0;
1488 return *(unsigned long *)addr;
1489}