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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/guarded_storage.h>
28#include <asm/access-regs.h>
29#include <asm/page.h>
30#include <linux/uaccess.h>
31#include <asm/unistd.h>
32#include <asm/runtime_instr.h>
33#include <asm/facility.h>
34#include <asm/fpu.h>
35
36#include "entry.h"
37
38#ifdef CONFIG_COMPAT
39#include "compat_ptrace.h"
40#endif
41
42void update_cr_regs(struct task_struct *task)
43{
44 struct pt_regs *regs = task_pt_regs(task);
45 struct thread_struct *thread = &task->thread;
46 union ctlreg0 cr0_old, cr0_new;
47 union ctlreg2 cr2_old, cr2_new;
48 int cr0_changed, cr2_changed;
49 union {
50 struct ctlreg regs[3];
51 struct {
52 struct ctlreg control;
53 struct ctlreg start;
54 struct ctlreg end;
55 };
56 } old, new;
57
58 local_ctl_store(0, &cr0_old.reg);
59 local_ctl_store(2, &cr2_old.reg);
60 cr0_new = cr0_old;
61 cr2_new = cr2_old;
62 /* Take care of the enable/disable of transactional execution. */
63 if (MACHINE_HAS_TE) {
64 /* Set or clear transaction execution TXC bit 8. */
65 cr0_new.tcx = 1;
66 if (task->thread.per_flags & PER_FLAG_NO_TE)
67 cr0_new.tcx = 0;
68 /* Set or clear transaction execution TDC bits 62 and 63. */
69 cr2_new.tdc = 0;
70 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
71 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
72 cr2_new.tdc = 1;
73 else
74 cr2_new.tdc = 2;
75 }
76 }
77 /* Take care of enable/disable of guarded storage. */
78 if (MACHINE_HAS_GS) {
79 cr2_new.gse = 0;
80 if (task->thread.gs_cb)
81 cr2_new.gse = 1;
82 }
83 /* Load control register 0/2 iff changed */
84 cr0_changed = cr0_new.val != cr0_old.val;
85 cr2_changed = cr2_new.val != cr2_old.val;
86 if (cr0_changed)
87 local_ctl_load(0, &cr0_new.reg);
88 if (cr2_changed)
89 local_ctl_load(2, &cr2_new.reg);
90 /* Copy user specified PER registers */
91 new.control.val = thread->per_user.control;
92 new.start.val = thread->per_user.start;
93 new.end.val = thread->per_user.end;
94
95 /* merge TIF_SINGLE_STEP into user specified PER registers. */
96 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
97 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
98 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
99 new.control.val |= PER_EVENT_BRANCH;
100 else
101 new.control.val |= PER_EVENT_IFETCH;
102 new.control.val |= PER_CONTROL_SUSPENSION;
103 new.control.val |= PER_EVENT_TRANSACTION_END;
104 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
105 new.control.val |= PER_EVENT_IFETCH;
106 new.start.val = 0;
107 new.end.val = -1UL;
108 }
109
110 /* Take care of the PER enablement bit in the PSW. */
111 if (!(new.control.val & PER_EVENT_MASK)) {
112 regs->psw.mask &= ~PSW_MASK_PER;
113 return;
114 }
115 regs->psw.mask |= PSW_MASK_PER;
116 __local_ctl_store(9, 11, old.regs);
117 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
118 __local_ctl_load(9, 11, new.regs);
119}
120
121void user_enable_single_step(struct task_struct *task)
122{
123 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
124 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
125}
126
127void user_disable_single_step(struct task_struct *task)
128{
129 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
130 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
131}
132
133void user_enable_block_step(struct task_struct *task)
134{
135 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
136 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
137}
138
139/*
140 * Called by kernel/ptrace.c when detaching..
141 *
142 * Clear all debugging related fields.
143 */
144void ptrace_disable(struct task_struct *task)
145{
146 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
147 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
148 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
149 clear_tsk_thread_flag(task, TIF_PER_TRAP);
150 task->thread.per_flags = 0;
151}
152
153#define __ADDR_MASK 7
154
155static inline unsigned long __peek_user_per(struct task_struct *child,
156 addr_t addr)
157{
158 if (addr == offsetof(struct per_struct_kernel, cr9))
159 /* Control bits of the active per set. */
160 return test_thread_flag(TIF_SINGLE_STEP) ?
161 PER_EVENT_IFETCH : child->thread.per_user.control;
162 else if (addr == offsetof(struct per_struct_kernel, cr10))
163 /* Start address of the active per set. */
164 return test_thread_flag(TIF_SINGLE_STEP) ?
165 0 : child->thread.per_user.start;
166 else if (addr == offsetof(struct per_struct_kernel, cr11))
167 /* End address of the active per set. */
168 return test_thread_flag(TIF_SINGLE_STEP) ?
169 -1UL : child->thread.per_user.end;
170 else if (addr == offsetof(struct per_struct_kernel, bits))
171 /* Single-step bit. */
172 return test_thread_flag(TIF_SINGLE_STEP) ?
173 (1UL << (BITS_PER_LONG - 1)) : 0;
174 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
175 /* Start address of the user specified per set. */
176 return child->thread.per_user.start;
177 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
178 /* End address of the user specified per set. */
179 return child->thread.per_user.end;
180 else if (addr == offsetof(struct per_struct_kernel, perc_atmid))
181 /* PER code, ATMID and AI of the last PER trap */
182 return (unsigned long)
183 child->thread.per_event.cause << (BITS_PER_LONG - 16);
184 else if (addr == offsetof(struct per_struct_kernel, address))
185 /* Address of the last PER trap */
186 return child->thread.per_event.address;
187 else if (addr == offsetof(struct per_struct_kernel, access_id))
188 /* Access id of the last PER trap */
189 return (unsigned long)
190 child->thread.per_event.paid << (BITS_PER_LONG - 8);
191 return 0;
192}
193
194/*
195 * Read the word at offset addr from the user area of a process. The
196 * trouble here is that the information is littered over different
197 * locations. The process registers are found on the kernel stack,
198 * the floating point stuff and the trace settings are stored in
199 * the task structure. In addition the different structures in
200 * struct user contain pad bytes that should be read as zeroes.
201 * Lovely...
202 */
203static unsigned long __peek_user(struct task_struct *child, addr_t addr)
204{
205 addr_t offset, tmp;
206
207 if (addr < offsetof(struct user, regs.acrs)) {
208 /*
209 * psw and gprs are stored on the stack
210 */
211 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
212 if (addr == offsetof(struct user, regs.psw.mask)) {
213 /* Return a clean psw mask. */
214 tmp &= PSW_MASK_USER | PSW_MASK_RI;
215 tmp |= PSW_USER_BITS;
216 }
217
218 } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
219 /*
220 * access registers are stored in the thread structure
221 */
222 offset = addr - offsetof(struct user, regs.acrs);
223 /*
224 * Very special case: old & broken 64 bit gdb reading
225 * from acrs[15]. Result is a 64 bit value. Read the
226 * 32 bit acrs[15] value and shift it by 32. Sick...
227 */
228 if (addr == offsetof(struct user, regs.acrs[15]))
229 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
230 else
231 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
232
233 } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
234 /*
235 * orig_gpr2 is stored on the kernel stack
236 */
237 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
238
239 } else if (addr < offsetof(struct user, regs.fp_regs)) {
240 /*
241 * prevent reads of padding hole between
242 * orig_gpr2 and fp_regs on s390.
243 */
244 tmp = 0;
245
246 } else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
247 /*
248 * floating point control reg. is in the thread structure
249 */
250 tmp = child->thread.ufpu.fpc;
251 tmp <<= BITS_PER_LONG - 32;
252
253 } else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
254 /*
255 * floating point regs. are in the child->thread.ufpu.vxrs array
256 */
257 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
258 tmp = *(addr_t *)((addr_t)child->thread.ufpu.vxrs + 2 * offset);
259 } else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
260 /*
261 * Handle access to the per_info structure.
262 */
263 addr -= offsetof(struct user, regs.per_info);
264 tmp = __peek_user_per(child, addr);
265
266 } else
267 tmp = 0;
268
269 return tmp;
270}
271
272static int
273peek_user(struct task_struct *child, addr_t addr, addr_t data)
274{
275 addr_t tmp, mask;
276
277 /*
278 * Stupid gdb peeks/pokes the access registers in 64 bit with
279 * an alignment of 4. Programmers from hell...
280 */
281 mask = __ADDR_MASK;
282 if (addr >= offsetof(struct user, regs.acrs) &&
283 addr < offsetof(struct user, regs.orig_gpr2))
284 mask = 3;
285 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
286 return -EIO;
287
288 tmp = __peek_user(child, addr);
289 return put_user(tmp, (addr_t __user *) data);
290}
291
292static inline void __poke_user_per(struct task_struct *child,
293 addr_t addr, addr_t data)
294{
295 /*
296 * There are only three fields in the per_info struct that the
297 * debugger user can write to.
298 * 1) cr9: the debugger wants to set a new PER event mask
299 * 2) starting_addr: the debugger wants to set a new starting
300 * address to use with the PER event mask.
301 * 3) ending_addr: the debugger wants to set a new ending
302 * address to use with the PER event mask.
303 * The user specified PER event mask and the start and end
304 * addresses are used only if single stepping is not in effect.
305 * Writes to any other field in per_info are ignored.
306 */
307 if (addr == offsetof(struct per_struct_kernel, cr9))
308 /* PER event mask of the user specified per set. */
309 child->thread.per_user.control =
310 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
311 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
312 /* Starting address of the user specified per set. */
313 child->thread.per_user.start = data;
314 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
315 /* Ending address of the user specified per set. */
316 child->thread.per_user.end = data;
317}
318
319/*
320 * Write a word to the user area of a process at location addr. This
321 * operation does have an additional problem compared to peek_user.
322 * Stores to the program status word and on the floating point
323 * control register needs to get checked for validity.
324 */
325static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
326{
327 addr_t offset;
328
329
330 if (addr < offsetof(struct user, regs.acrs)) {
331 struct pt_regs *regs = task_pt_regs(child);
332 /*
333 * psw and gprs are stored on the stack
334 */
335 if (addr == offsetof(struct user, regs.psw.mask)) {
336 unsigned long mask = PSW_MASK_USER;
337
338 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
339 if ((data ^ PSW_USER_BITS) & ~mask)
340 /* Invalid psw mask. */
341 return -EINVAL;
342 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
343 /* Invalid address-space-control bits */
344 return -EINVAL;
345 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
346 /* Invalid addressing mode bits */
347 return -EINVAL;
348 }
349
350 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
351 addr == offsetof(struct user, regs.gprs[2])) {
352 struct pt_regs *regs = task_pt_regs(child);
353
354 regs->int_code = 0x20000 | (data & 0xffff);
355 }
356 *(addr_t *)((addr_t) ®s->psw + addr) = data;
357 } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
358 /*
359 * access registers are stored in the thread structure
360 */
361 offset = addr - offsetof(struct user, regs.acrs);
362 /*
363 * Very special case: old & broken 64 bit gdb writing
364 * to acrs[15] with a 64 bit value. Ignore the lower
365 * half of the value and write the upper 32 bit to
366 * acrs[15]. Sick...
367 */
368 if (addr == offsetof(struct user, regs.acrs[15]))
369 child->thread.acrs[15] = (unsigned int) (data >> 32);
370 else
371 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
372
373 } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
374 /*
375 * orig_gpr2 is stored on the kernel stack
376 */
377 task_pt_regs(child)->orig_gpr2 = data;
378
379 } else if (addr < offsetof(struct user, regs.fp_regs)) {
380 /*
381 * prevent writes of padding hole between
382 * orig_gpr2 and fp_regs on s390.
383 */
384 return 0;
385
386 } else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
387 /*
388 * floating point control reg. is in the thread structure
389 */
390 if ((unsigned int)data != 0)
391 return -EINVAL;
392 child->thread.ufpu.fpc = data >> (BITS_PER_LONG - 32);
393
394 } else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
395 /*
396 * floating point regs. are in the child->thread.ufpu.vxrs array
397 */
398 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
399 *(addr_t *)((addr_t)child->thread.ufpu.vxrs + 2 * offset) = data;
400 } else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
401 /*
402 * Handle access to the per_info structure.
403 */
404 addr -= offsetof(struct user, regs.per_info);
405 __poke_user_per(child, addr, data);
406
407 }
408
409 return 0;
410}
411
412static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
413{
414 addr_t mask;
415
416 /*
417 * Stupid gdb peeks/pokes the access registers in 64 bit with
418 * an alignment of 4. Programmers from hell indeed...
419 */
420 mask = __ADDR_MASK;
421 if (addr >= offsetof(struct user, regs.acrs) &&
422 addr < offsetof(struct user, regs.orig_gpr2))
423 mask = 3;
424 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
425 return -EIO;
426
427 return __poke_user(child, addr, data);
428}
429
430long arch_ptrace(struct task_struct *child, long request,
431 unsigned long addr, unsigned long data)
432{
433 ptrace_area parea;
434 int copied, ret;
435
436 switch (request) {
437 case PTRACE_PEEKUSR:
438 /* read the word at location addr in the USER area. */
439 return peek_user(child, addr, data);
440
441 case PTRACE_POKEUSR:
442 /* write the word at location addr in the USER area */
443 return poke_user(child, addr, data);
444
445 case PTRACE_PEEKUSR_AREA:
446 case PTRACE_POKEUSR_AREA:
447 if (copy_from_user(&parea, (void __force __user *) addr,
448 sizeof(parea)))
449 return -EFAULT;
450 addr = parea.kernel_addr;
451 data = parea.process_addr;
452 copied = 0;
453 while (copied < parea.len) {
454 if (request == PTRACE_PEEKUSR_AREA)
455 ret = peek_user(child, addr, data);
456 else {
457 addr_t utmp;
458 if (get_user(utmp,
459 (addr_t __force __user *) data))
460 return -EFAULT;
461 ret = poke_user(child, addr, utmp);
462 }
463 if (ret)
464 return ret;
465 addr += sizeof(unsigned long);
466 data += sizeof(unsigned long);
467 copied += sizeof(unsigned long);
468 }
469 return 0;
470 case PTRACE_GET_LAST_BREAK:
471 return put_user(child->thread.last_break, (unsigned long __user *)data);
472 case PTRACE_ENABLE_TE:
473 if (!MACHINE_HAS_TE)
474 return -EIO;
475 child->thread.per_flags &= ~PER_FLAG_NO_TE;
476 return 0;
477 case PTRACE_DISABLE_TE:
478 if (!MACHINE_HAS_TE)
479 return -EIO;
480 child->thread.per_flags |= PER_FLAG_NO_TE;
481 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
482 return 0;
483 case PTRACE_TE_ABORT_RAND:
484 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
485 return -EIO;
486 switch (data) {
487 case 0UL:
488 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
489 break;
490 case 1UL:
491 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
492 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
493 break;
494 case 2UL:
495 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
496 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
497 break;
498 default:
499 return -EINVAL;
500 }
501 return 0;
502 default:
503 return ptrace_request(child, request, addr, data);
504 }
505}
506
507#ifdef CONFIG_COMPAT
508/*
509 * Now the fun part starts... a 31 bit program running in the
510 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
511 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
512 * to handle, the difference to the 64 bit versions of the requests
513 * is that the access is done in multiples of 4 byte instead of
514 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
515 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
516 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
517 * is a 31 bit program too, the content of struct user can be
518 * emulated. A 31 bit program peeking into the struct user of
519 * a 64 bit program is a no-no.
520 */
521
522/*
523 * Same as peek_user_per but for a 31 bit program.
524 */
525static inline __u32 __peek_user_per_compat(struct task_struct *child,
526 addr_t addr)
527{
528 if (addr == offsetof(struct compat_per_struct_kernel, cr9))
529 /* Control bits of the active per set. */
530 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
531 PER_EVENT_IFETCH : child->thread.per_user.control;
532 else if (addr == offsetof(struct compat_per_struct_kernel, cr10))
533 /* Start address of the active per set. */
534 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
535 0 : child->thread.per_user.start;
536 else if (addr == offsetof(struct compat_per_struct_kernel, cr11))
537 /* End address of the active per set. */
538 return test_thread_flag(TIF_SINGLE_STEP) ?
539 PSW32_ADDR_INSN : child->thread.per_user.end;
540 else if (addr == offsetof(struct compat_per_struct_kernel, bits))
541 /* Single-step bit. */
542 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
543 0x80000000 : 0;
544 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
545 /* Start address of the user specified per set. */
546 return (__u32) child->thread.per_user.start;
547 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
548 /* End address of the user specified per set. */
549 return (__u32) child->thread.per_user.end;
550 else if (addr == offsetof(struct compat_per_struct_kernel, perc_atmid))
551 /* PER code, ATMID and AI of the last PER trap */
552 return (__u32) child->thread.per_event.cause << 16;
553 else if (addr == offsetof(struct compat_per_struct_kernel, address))
554 /* Address of the last PER trap */
555 return (__u32) child->thread.per_event.address;
556 else if (addr == offsetof(struct compat_per_struct_kernel, access_id))
557 /* Access id of the last PER trap */
558 return (__u32) child->thread.per_event.paid << 24;
559 return 0;
560}
561
562/*
563 * Same as peek_user but for a 31 bit program.
564 */
565static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
566{
567 addr_t offset;
568 __u32 tmp;
569
570 if (addr < offsetof(struct compat_user, regs.acrs)) {
571 struct pt_regs *regs = task_pt_regs(child);
572 /*
573 * psw and gprs are stored on the stack
574 */
575 if (addr == offsetof(struct compat_user, regs.psw.mask)) {
576 /* Fake a 31 bit psw mask. */
577 tmp = (__u32)(regs->psw.mask >> 32);
578 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
579 tmp |= PSW32_USER_BITS;
580 } else if (addr == offsetof(struct compat_user, regs.psw.addr)) {
581 /* Fake a 31 bit psw address. */
582 tmp = (__u32) regs->psw.addr |
583 (__u32)(regs->psw.mask & PSW_MASK_BA);
584 } else {
585 /* gpr 0-15 */
586 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
587 }
588 } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
589 /*
590 * access registers are stored in the thread structure
591 */
592 offset = addr - offsetof(struct compat_user, regs.acrs);
593 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
594
595 } else if (addr == offsetof(struct compat_user, regs.orig_gpr2)) {
596 /*
597 * orig_gpr2 is stored on the kernel stack
598 */
599 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
600
601 } else if (addr < offsetof(struct compat_user, regs.fp_regs)) {
602 /*
603 * prevent reads of padding hole between
604 * orig_gpr2 and fp_regs on s390.
605 */
606 tmp = 0;
607
608 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
609 /*
610 * floating point control reg. is in the thread structure
611 */
612 tmp = child->thread.ufpu.fpc;
613
614 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
615 /*
616 * floating point regs. are in the child->thread.ufpu.vxrs array
617 */
618 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
619 tmp = *(__u32 *)((addr_t)child->thread.ufpu.vxrs + 2 * offset);
620 } else if (addr < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
621 /*
622 * Handle access to the per_info structure.
623 */
624 addr -= offsetof(struct compat_user, regs.per_info);
625 tmp = __peek_user_per_compat(child, addr);
626
627 } else
628 tmp = 0;
629
630 return tmp;
631}
632
633static int peek_user_compat(struct task_struct *child,
634 addr_t addr, addr_t data)
635{
636 __u32 tmp;
637
638 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
639 return -EIO;
640
641 tmp = __peek_user_compat(child, addr);
642 return put_user(tmp, (__u32 __user *) data);
643}
644
645/*
646 * Same as poke_user_per but for a 31 bit program.
647 */
648static inline void __poke_user_per_compat(struct task_struct *child,
649 addr_t addr, __u32 data)
650{
651 if (addr == offsetof(struct compat_per_struct_kernel, cr9))
652 /* PER event mask of the user specified per set. */
653 child->thread.per_user.control =
654 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
655 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
656 /* Starting address of the user specified per set. */
657 child->thread.per_user.start = data;
658 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
659 /* Ending address of the user specified per set. */
660 child->thread.per_user.end = data;
661}
662
663/*
664 * Same as poke_user but for a 31 bit program.
665 */
666static int __poke_user_compat(struct task_struct *child,
667 addr_t addr, addr_t data)
668{
669 __u32 tmp = (__u32) data;
670 addr_t offset;
671
672 if (addr < offsetof(struct compat_user, regs.acrs)) {
673 struct pt_regs *regs = task_pt_regs(child);
674 /*
675 * psw, gprs, acrs and orig_gpr2 are stored on the stack
676 */
677 if (addr == offsetof(struct compat_user, regs.psw.mask)) {
678 __u32 mask = PSW32_MASK_USER;
679
680 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
681 /* Build a 64 bit psw mask from 31 bit mask. */
682 if ((tmp ^ PSW32_USER_BITS) & ~mask)
683 /* Invalid psw mask. */
684 return -EINVAL;
685 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
686 /* Invalid address-space-control bits */
687 return -EINVAL;
688 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
689 (regs->psw.mask & PSW_MASK_BA) |
690 (__u64)(tmp & mask) << 32;
691 } else if (addr == offsetof(struct compat_user, regs.psw.addr)) {
692 /* Build a 64 bit psw address from 31 bit address. */
693 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
694 /* Transfer 31 bit amode bit to psw mask. */
695 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
696 (__u64)(tmp & PSW32_ADDR_AMODE);
697 } else {
698 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
699 addr == offsetof(struct compat_user, regs.gprs[2])) {
700 struct pt_regs *regs = task_pt_regs(child);
701
702 regs->int_code = 0x20000 | (data & 0xffff);
703 }
704 /* gpr 0-15 */
705 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
706 }
707 } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
708 /*
709 * access registers are stored in the thread structure
710 */
711 offset = addr - offsetof(struct compat_user, regs.acrs);
712 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
713
714 } else if (addr == offsetof(struct compat_user, regs.orig_gpr2)) {
715 /*
716 * orig_gpr2 is stored on the kernel stack
717 */
718 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
719
720 } else if (addr < offsetof(struct compat_user, regs.fp_regs)) {
721 /*
722 * prevent writess of padding hole between
723 * orig_gpr2 and fp_regs on s390.
724 */
725 return 0;
726
727 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
728 /*
729 * floating point control reg. is in the thread structure
730 */
731 child->thread.ufpu.fpc = data;
732
733 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
734 /*
735 * floating point regs. are in the child->thread.ufpu.vxrs array
736 */
737 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
738 *(__u32 *)((addr_t)child->thread.ufpu.vxrs + 2 * offset) = tmp;
739 } else if (addr < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
740 /*
741 * Handle access to the per_info structure.
742 */
743 addr -= offsetof(struct compat_user, regs.per_info);
744 __poke_user_per_compat(child, addr, data);
745 }
746
747 return 0;
748}
749
750static int poke_user_compat(struct task_struct *child,
751 addr_t addr, addr_t data)
752{
753 if (!is_compat_task() || (addr & 3) ||
754 addr > sizeof(struct compat_user) - 3)
755 return -EIO;
756
757 return __poke_user_compat(child, addr, data);
758}
759
760long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
761 compat_ulong_t caddr, compat_ulong_t cdata)
762{
763 unsigned long addr = caddr;
764 unsigned long data = cdata;
765 compat_ptrace_area parea;
766 int copied, ret;
767
768 switch (request) {
769 case PTRACE_PEEKUSR:
770 /* read the word at location addr in the USER area. */
771 return peek_user_compat(child, addr, data);
772
773 case PTRACE_POKEUSR:
774 /* write the word at location addr in the USER area */
775 return poke_user_compat(child, addr, data);
776
777 case PTRACE_PEEKUSR_AREA:
778 case PTRACE_POKEUSR_AREA:
779 if (copy_from_user(&parea, (void __force __user *) addr,
780 sizeof(parea)))
781 return -EFAULT;
782 addr = parea.kernel_addr;
783 data = parea.process_addr;
784 copied = 0;
785 while (copied < parea.len) {
786 if (request == PTRACE_PEEKUSR_AREA)
787 ret = peek_user_compat(child, addr, data);
788 else {
789 __u32 utmp;
790 if (get_user(utmp,
791 (__u32 __force __user *) data))
792 return -EFAULT;
793 ret = poke_user_compat(child, addr, utmp);
794 }
795 if (ret)
796 return ret;
797 addr += sizeof(unsigned int);
798 data += sizeof(unsigned int);
799 copied += sizeof(unsigned int);
800 }
801 return 0;
802 case PTRACE_GET_LAST_BREAK:
803 return put_user(child->thread.last_break, (unsigned int __user *)data);
804 }
805 return compat_ptrace_request(child, request, addr, data);
806}
807#endif
808
809/*
810 * user_regset definitions.
811 */
812
813static int s390_regs_get(struct task_struct *target,
814 const struct user_regset *regset,
815 struct membuf to)
816{
817 unsigned pos;
818 if (target == current)
819 save_access_regs(target->thread.acrs);
820
821 for (pos = 0; pos < sizeof(s390_regs); pos += sizeof(long))
822 membuf_store(&to, __peek_user(target, pos));
823 return 0;
824}
825
826static int s390_regs_set(struct task_struct *target,
827 const struct user_regset *regset,
828 unsigned int pos, unsigned int count,
829 const void *kbuf, const void __user *ubuf)
830{
831 int rc = 0;
832
833 if (target == current)
834 save_access_regs(target->thread.acrs);
835
836 if (kbuf) {
837 const unsigned long *k = kbuf;
838 while (count > 0 && !rc) {
839 rc = __poke_user(target, pos, *k++);
840 count -= sizeof(*k);
841 pos += sizeof(*k);
842 }
843 } else {
844 const unsigned long __user *u = ubuf;
845 while (count > 0 && !rc) {
846 unsigned long word;
847 rc = __get_user(word, u++);
848 if (rc)
849 break;
850 rc = __poke_user(target, pos, word);
851 count -= sizeof(*u);
852 pos += sizeof(*u);
853 }
854 }
855
856 if (rc == 0 && target == current)
857 restore_access_regs(target->thread.acrs);
858
859 return rc;
860}
861
862static int s390_fpregs_get(struct task_struct *target,
863 const struct user_regset *regset,
864 struct membuf to)
865{
866 _s390_fp_regs fp_regs;
867
868 if (target == current)
869 save_user_fpu_regs();
870
871 fp_regs.fpc = target->thread.ufpu.fpc;
872 fpregs_store(&fp_regs, &target->thread.ufpu);
873
874 return membuf_write(&to, &fp_regs, sizeof(fp_regs));
875}
876
877static int s390_fpregs_set(struct task_struct *target,
878 const struct user_regset *regset, unsigned int pos,
879 unsigned int count, const void *kbuf,
880 const void __user *ubuf)
881{
882 int rc = 0;
883 freg_t fprs[__NUM_FPRS];
884
885 if (target == current)
886 save_user_fpu_regs();
887 convert_vx_to_fp(fprs, target->thread.ufpu.vxrs);
888 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
889 u32 ufpc[2] = { target->thread.ufpu.fpc, 0 };
890 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
891 0, offsetof(s390_fp_regs, fprs));
892 if (rc)
893 return rc;
894 if (ufpc[1] != 0)
895 return -EINVAL;
896 target->thread.ufpu.fpc = ufpc[0];
897 }
898
899 if (rc == 0 && count > 0)
900 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
901 fprs, offsetof(s390_fp_regs, fprs), -1);
902 if (rc)
903 return rc;
904 convert_fp_to_vx(target->thread.ufpu.vxrs, fprs);
905 return rc;
906}
907
908static int s390_last_break_get(struct task_struct *target,
909 const struct user_regset *regset,
910 struct membuf to)
911{
912 return membuf_store(&to, target->thread.last_break);
913}
914
915static int s390_last_break_set(struct task_struct *target,
916 const struct user_regset *regset,
917 unsigned int pos, unsigned int count,
918 const void *kbuf, const void __user *ubuf)
919{
920 return 0;
921}
922
923static int s390_tdb_get(struct task_struct *target,
924 const struct user_regset *regset,
925 struct membuf to)
926{
927 struct pt_regs *regs = task_pt_regs(target);
928 size_t size;
929
930 if (!(regs->int_code & 0x200))
931 return -ENODATA;
932 size = sizeof(target->thread.trap_tdb.data);
933 return membuf_write(&to, target->thread.trap_tdb.data, size);
934}
935
936static int s390_tdb_set(struct task_struct *target,
937 const struct user_regset *regset,
938 unsigned int pos, unsigned int count,
939 const void *kbuf, const void __user *ubuf)
940{
941 return 0;
942}
943
944static int s390_vxrs_low_get(struct task_struct *target,
945 const struct user_regset *regset,
946 struct membuf to)
947{
948 __u64 vxrs[__NUM_VXRS_LOW];
949 int i;
950
951 if (!cpu_has_vx())
952 return -ENODEV;
953 if (target == current)
954 save_user_fpu_regs();
955 for (i = 0; i < __NUM_VXRS_LOW; i++)
956 vxrs[i] = target->thread.ufpu.vxrs[i].low;
957 return membuf_write(&to, vxrs, sizeof(vxrs));
958}
959
960static int s390_vxrs_low_set(struct task_struct *target,
961 const struct user_regset *regset,
962 unsigned int pos, unsigned int count,
963 const void *kbuf, const void __user *ubuf)
964{
965 __u64 vxrs[__NUM_VXRS_LOW];
966 int i, rc;
967
968 if (!cpu_has_vx())
969 return -ENODEV;
970 if (target == current)
971 save_user_fpu_regs();
972
973 for (i = 0; i < __NUM_VXRS_LOW; i++)
974 vxrs[i] = target->thread.ufpu.vxrs[i].low;
975
976 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
977 if (rc == 0)
978 for (i = 0; i < __NUM_VXRS_LOW; i++)
979 target->thread.ufpu.vxrs[i].low = vxrs[i];
980
981 return rc;
982}
983
984static int s390_vxrs_high_get(struct task_struct *target,
985 const struct user_regset *regset,
986 struct membuf to)
987{
988 if (!cpu_has_vx())
989 return -ENODEV;
990 if (target == current)
991 save_user_fpu_regs();
992 return membuf_write(&to, target->thread.ufpu.vxrs + __NUM_VXRS_LOW,
993 __NUM_VXRS_HIGH * sizeof(__vector128));
994}
995
996static int s390_vxrs_high_set(struct task_struct *target,
997 const struct user_regset *regset,
998 unsigned int pos, unsigned int count,
999 const void *kbuf, const void __user *ubuf)
1000{
1001 int rc;
1002
1003 if (!cpu_has_vx())
1004 return -ENODEV;
1005 if (target == current)
1006 save_user_fpu_regs();
1007
1008 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1009 target->thread.ufpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1010 return rc;
1011}
1012
1013static int s390_system_call_get(struct task_struct *target,
1014 const struct user_regset *regset,
1015 struct membuf to)
1016{
1017 return membuf_store(&to, target->thread.system_call);
1018}
1019
1020static int s390_system_call_set(struct task_struct *target,
1021 const struct user_regset *regset,
1022 unsigned int pos, unsigned int count,
1023 const void *kbuf, const void __user *ubuf)
1024{
1025 unsigned int *data = &target->thread.system_call;
1026 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1027 data, 0, sizeof(unsigned int));
1028}
1029
1030static int s390_gs_cb_get(struct task_struct *target,
1031 const struct user_regset *regset,
1032 struct membuf to)
1033{
1034 struct gs_cb *data = target->thread.gs_cb;
1035
1036 if (!MACHINE_HAS_GS)
1037 return -ENODEV;
1038 if (!data)
1039 return -ENODATA;
1040 if (target == current)
1041 save_gs_cb(data);
1042 return membuf_write(&to, data, sizeof(struct gs_cb));
1043}
1044
1045static int s390_gs_cb_set(struct task_struct *target,
1046 const struct user_regset *regset,
1047 unsigned int pos, unsigned int count,
1048 const void *kbuf, const void __user *ubuf)
1049{
1050 struct gs_cb gs_cb = { }, *data = NULL;
1051 int rc;
1052
1053 if (!MACHINE_HAS_GS)
1054 return -ENODEV;
1055 if (!target->thread.gs_cb) {
1056 data = kzalloc(sizeof(*data), GFP_KERNEL);
1057 if (!data)
1058 return -ENOMEM;
1059 }
1060 if (!target->thread.gs_cb)
1061 gs_cb.gsd = 25;
1062 else if (target == current)
1063 save_gs_cb(&gs_cb);
1064 else
1065 gs_cb = *target->thread.gs_cb;
1066 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1067 &gs_cb, 0, sizeof(gs_cb));
1068 if (rc) {
1069 kfree(data);
1070 return -EFAULT;
1071 }
1072 preempt_disable();
1073 if (!target->thread.gs_cb)
1074 target->thread.gs_cb = data;
1075 *target->thread.gs_cb = gs_cb;
1076 if (target == current) {
1077 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
1078 restore_gs_cb(target->thread.gs_cb);
1079 }
1080 preempt_enable();
1081 return rc;
1082}
1083
1084static int s390_gs_bc_get(struct task_struct *target,
1085 const struct user_regset *regset,
1086 struct membuf to)
1087{
1088 struct gs_cb *data = target->thread.gs_bc_cb;
1089
1090 if (!MACHINE_HAS_GS)
1091 return -ENODEV;
1092 if (!data)
1093 return -ENODATA;
1094 return membuf_write(&to, data, sizeof(struct gs_cb));
1095}
1096
1097static int s390_gs_bc_set(struct task_struct *target,
1098 const struct user_regset *regset,
1099 unsigned int pos, unsigned int count,
1100 const void *kbuf, const void __user *ubuf)
1101{
1102 struct gs_cb *data = target->thread.gs_bc_cb;
1103
1104 if (!MACHINE_HAS_GS)
1105 return -ENODEV;
1106 if (!data) {
1107 data = kzalloc(sizeof(*data), GFP_KERNEL);
1108 if (!data)
1109 return -ENOMEM;
1110 target->thread.gs_bc_cb = data;
1111 }
1112 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1113 data, 0, sizeof(struct gs_cb));
1114}
1115
1116static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
1117{
1118 return (cb->rca & 0x1f) == 0 &&
1119 (cb->roa & 0xfff) == 0 &&
1120 (cb->rla & 0xfff) == 0xfff &&
1121 cb->s == 1 &&
1122 cb->k == 1 &&
1123 cb->h == 0 &&
1124 cb->reserved1 == 0 &&
1125 cb->ps == 1 &&
1126 cb->qs == 0 &&
1127 cb->pc == 1 &&
1128 cb->qc == 0 &&
1129 cb->reserved2 == 0 &&
1130 cb->reserved3 == 0 &&
1131 cb->reserved4 == 0 &&
1132 cb->reserved5 == 0 &&
1133 cb->reserved6 == 0 &&
1134 cb->reserved7 == 0 &&
1135 cb->reserved8 == 0 &&
1136 cb->rla >= cb->roa &&
1137 cb->rca >= cb->roa &&
1138 cb->rca <= cb->rla+1 &&
1139 cb->m < 3;
1140}
1141
1142static int s390_runtime_instr_get(struct task_struct *target,
1143 const struct user_regset *regset,
1144 struct membuf to)
1145{
1146 struct runtime_instr_cb *data = target->thread.ri_cb;
1147
1148 if (!test_facility(64))
1149 return -ENODEV;
1150 if (!data)
1151 return -ENODATA;
1152
1153 return membuf_write(&to, data, sizeof(struct runtime_instr_cb));
1154}
1155
1156static int s390_runtime_instr_set(struct task_struct *target,
1157 const struct user_regset *regset,
1158 unsigned int pos, unsigned int count,
1159 const void *kbuf, const void __user *ubuf)
1160{
1161 struct runtime_instr_cb ri_cb = { }, *data = NULL;
1162 int rc;
1163
1164 if (!test_facility(64))
1165 return -ENODEV;
1166
1167 if (!target->thread.ri_cb) {
1168 data = kzalloc(sizeof(*data), GFP_KERNEL);
1169 if (!data)
1170 return -ENOMEM;
1171 }
1172
1173 if (target->thread.ri_cb) {
1174 if (target == current)
1175 store_runtime_instr_cb(&ri_cb);
1176 else
1177 ri_cb = *target->thread.ri_cb;
1178 }
1179
1180 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1181 &ri_cb, 0, sizeof(struct runtime_instr_cb));
1182 if (rc) {
1183 kfree(data);
1184 return -EFAULT;
1185 }
1186
1187 if (!is_ri_cb_valid(&ri_cb)) {
1188 kfree(data);
1189 return -EINVAL;
1190 }
1191 /*
1192 * Override access key in any case, since user space should
1193 * not be able to set it, nor should it care about it.
1194 */
1195 ri_cb.key = PAGE_DEFAULT_KEY >> 4;
1196 preempt_disable();
1197 if (!target->thread.ri_cb)
1198 target->thread.ri_cb = data;
1199 *target->thread.ri_cb = ri_cb;
1200 if (target == current)
1201 load_runtime_instr_cb(target->thread.ri_cb);
1202 preempt_enable();
1203
1204 return 0;
1205}
1206
1207static const struct user_regset s390_regsets[] = {
1208 {
1209 .core_note_type = NT_PRSTATUS,
1210 .n = sizeof(s390_regs) / sizeof(long),
1211 .size = sizeof(long),
1212 .align = sizeof(long),
1213 .regset_get = s390_regs_get,
1214 .set = s390_regs_set,
1215 },
1216 {
1217 .core_note_type = NT_PRFPREG,
1218 .n = sizeof(s390_fp_regs) / sizeof(long),
1219 .size = sizeof(long),
1220 .align = sizeof(long),
1221 .regset_get = s390_fpregs_get,
1222 .set = s390_fpregs_set,
1223 },
1224 {
1225 .core_note_type = NT_S390_SYSTEM_CALL,
1226 .n = 1,
1227 .size = sizeof(unsigned int),
1228 .align = sizeof(unsigned int),
1229 .regset_get = s390_system_call_get,
1230 .set = s390_system_call_set,
1231 },
1232 {
1233 .core_note_type = NT_S390_LAST_BREAK,
1234 .n = 1,
1235 .size = sizeof(long),
1236 .align = sizeof(long),
1237 .regset_get = s390_last_break_get,
1238 .set = s390_last_break_set,
1239 },
1240 {
1241 .core_note_type = NT_S390_TDB,
1242 .n = 1,
1243 .size = 256,
1244 .align = 1,
1245 .regset_get = s390_tdb_get,
1246 .set = s390_tdb_set,
1247 },
1248 {
1249 .core_note_type = NT_S390_VXRS_LOW,
1250 .n = __NUM_VXRS_LOW,
1251 .size = sizeof(__u64),
1252 .align = sizeof(__u64),
1253 .regset_get = s390_vxrs_low_get,
1254 .set = s390_vxrs_low_set,
1255 },
1256 {
1257 .core_note_type = NT_S390_VXRS_HIGH,
1258 .n = __NUM_VXRS_HIGH,
1259 .size = sizeof(__vector128),
1260 .align = sizeof(__vector128),
1261 .regset_get = s390_vxrs_high_get,
1262 .set = s390_vxrs_high_set,
1263 },
1264 {
1265 .core_note_type = NT_S390_GS_CB,
1266 .n = sizeof(struct gs_cb) / sizeof(__u64),
1267 .size = sizeof(__u64),
1268 .align = sizeof(__u64),
1269 .regset_get = s390_gs_cb_get,
1270 .set = s390_gs_cb_set,
1271 },
1272 {
1273 .core_note_type = NT_S390_GS_BC,
1274 .n = sizeof(struct gs_cb) / sizeof(__u64),
1275 .size = sizeof(__u64),
1276 .align = sizeof(__u64),
1277 .regset_get = s390_gs_bc_get,
1278 .set = s390_gs_bc_set,
1279 },
1280 {
1281 .core_note_type = NT_S390_RI_CB,
1282 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1283 .size = sizeof(__u64),
1284 .align = sizeof(__u64),
1285 .regset_get = s390_runtime_instr_get,
1286 .set = s390_runtime_instr_set,
1287 },
1288};
1289
1290static const struct user_regset_view user_s390_view = {
1291 .name = "s390x",
1292 .e_machine = EM_S390,
1293 .regsets = s390_regsets,
1294 .n = ARRAY_SIZE(s390_regsets)
1295};
1296
1297#ifdef CONFIG_COMPAT
1298static int s390_compat_regs_get(struct task_struct *target,
1299 const struct user_regset *regset,
1300 struct membuf to)
1301{
1302 unsigned n;
1303
1304 if (target == current)
1305 save_access_regs(target->thread.acrs);
1306
1307 for (n = 0; n < sizeof(s390_compat_regs); n += sizeof(compat_ulong_t))
1308 membuf_store(&to, __peek_user_compat(target, n));
1309 return 0;
1310}
1311
1312static int s390_compat_regs_set(struct task_struct *target,
1313 const struct user_regset *regset,
1314 unsigned int pos, unsigned int count,
1315 const void *kbuf, const void __user *ubuf)
1316{
1317 int rc = 0;
1318
1319 if (target == current)
1320 save_access_regs(target->thread.acrs);
1321
1322 if (kbuf) {
1323 const compat_ulong_t *k = kbuf;
1324 while (count > 0 && !rc) {
1325 rc = __poke_user_compat(target, pos, *k++);
1326 count -= sizeof(*k);
1327 pos += sizeof(*k);
1328 }
1329 } else {
1330 const compat_ulong_t __user *u = ubuf;
1331 while (count > 0 && !rc) {
1332 compat_ulong_t word;
1333 rc = __get_user(word, u++);
1334 if (rc)
1335 break;
1336 rc = __poke_user_compat(target, pos, word);
1337 count -= sizeof(*u);
1338 pos += sizeof(*u);
1339 }
1340 }
1341
1342 if (rc == 0 && target == current)
1343 restore_access_regs(target->thread.acrs);
1344
1345 return rc;
1346}
1347
1348static int s390_compat_regs_high_get(struct task_struct *target,
1349 const struct user_regset *regset,
1350 struct membuf to)
1351{
1352 compat_ulong_t *gprs_high;
1353 int i;
1354
1355 gprs_high = (compat_ulong_t *)task_pt_regs(target)->gprs;
1356 for (i = 0; i < NUM_GPRS; i++, gprs_high += 2)
1357 membuf_store(&to, *gprs_high);
1358 return 0;
1359}
1360
1361static int s390_compat_regs_high_set(struct task_struct *target,
1362 const struct user_regset *regset,
1363 unsigned int pos, unsigned int count,
1364 const void *kbuf, const void __user *ubuf)
1365{
1366 compat_ulong_t *gprs_high;
1367 int rc = 0;
1368
1369 gprs_high = (compat_ulong_t *)
1370 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1371 if (kbuf) {
1372 const compat_ulong_t *k = kbuf;
1373 while (count > 0) {
1374 *gprs_high = *k++;
1375 *gprs_high += 2;
1376 count -= sizeof(*k);
1377 }
1378 } else {
1379 const compat_ulong_t __user *u = ubuf;
1380 while (count > 0 && !rc) {
1381 unsigned long word;
1382 rc = __get_user(word, u++);
1383 if (rc)
1384 break;
1385 *gprs_high = word;
1386 *gprs_high += 2;
1387 count -= sizeof(*u);
1388 }
1389 }
1390
1391 return rc;
1392}
1393
1394static int s390_compat_last_break_get(struct task_struct *target,
1395 const struct user_regset *regset,
1396 struct membuf to)
1397{
1398 compat_ulong_t last_break = target->thread.last_break;
1399
1400 return membuf_store(&to, (unsigned long)last_break);
1401}
1402
1403static int s390_compat_last_break_set(struct task_struct *target,
1404 const struct user_regset *regset,
1405 unsigned int pos, unsigned int count,
1406 const void *kbuf, const void __user *ubuf)
1407{
1408 return 0;
1409}
1410
1411static const struct user_regset s390_compat_regsets[] = {
1412 {
1413 .core_note_type = NT_PRSTATUS,
1414 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1415 .size = sizeof(compat_long_t),
1416 .align = sizeof(compat_long_t),
1417 .regset_get = s390_compat_regs_get,
1418 .set = s390_compat_regs_set,
1419 },
1420 {
1421 .core_note_type = NT_PRFPREG,
1422 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1423 .size = sizeof(compat_long_t),
1424 .align = sizeof(compat_long_t),
1425 .regset_get = s390_fpregs_get,
1426 .set = s390_fpregs_set,
1427 },
1428 {
1429 .core_note_type = NT_S390_SYSTEM_CALL,
1430 .n = 1,
1431 .size = sizeof(compat_uint_t),
1432 .align = sizeof(compat_uint_t),
1433 .regset_get = s390_system_call_get,
1434 .set = s390_system_call_set,
1435 },
1436 {
1437 .core_note_type = NT_S390_LAST_BREAK,
1438 .n = 1,
1439 .size = sizeof(long),
1440 .align = sizeof(long),
1441 .regset_get = s390_compat_last_break_get,
1442 .set = s390_compat_last_break_set,
1443 },
1444 {
1445 .core_note_type = NT_S390_TDB,
1446 .n = 1,
1447 .size = 256,
1448 .align = 1,
1449 .regset_get = s390_tdb_get,
1450 .set = s390_tdb_set,
1451 },
1452 {
1453 .core_note_type = NT_S390_VXRS_LOW,
1454 .n = __NUM_VXRS_LOW,
1455 .size = sizeof(__u64),
1456 .align = sizeof(__u64),
1457 .regset_get = s390_vxrs_low_get,
1458 .set = s390_vxrs_low_set,
1459 },
1460 {
1461 .core_note_type = NT_S390_VXRS_HIGH,
1462 .n = __NUM_VXRS_HIGH,
1463 .size = sizeof(__vector128),
1464 .align = sizeof(__vector128),
1465 .regset_get = s390_vxrs_high_get,
1466 .set = s390_vxrs_high_set,
1467 },
1468 {
1469 .core_note_type = NT_S390_HIGH_GPRS,
1470 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1471 .size = sizeof(compat_long_t),
1472 .align = sizeof(compat_long_t),
1473 .regset_get = s390_compat_regs_high_get,
1474 .set = s390_compat_regs_high_set,
1475 },
1476 {
1477 .core_note_type = NT_S390_GS_CB,
1478 .n = sizeof(struct gs_cb) / sizeof(__u64),
1479 .size = sizeof(__u64),
1480 .align = sizeof(__u64),
1481 .regset_get = s390_gs_cb_get,
1482 .set = s390_gs_cb_set,
1483 },
1484 {
1485 .core_note_type = NT_S390_GS_BC,
1486 .n = sizeof(struct gs_cb) / sizeof(__u64),
1487 .size = sizeof(__u64),
1488 .align = sizeof(__u64),
1489 .regset_get = s390_gs_bc_get,
1490 .set = s390_gs_bc_set,
1491 },
1492 {
1493 .core_note_type = NT_S390_RI_CB,
1494 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1495 .size = sizeof(__u64),
1496 .align = sizeof(__u64),
1497 .regset_get = s390_runtime_instr_get,
1498 .set = s390_runtime_instr_set,
1499 },
1500};
1501
1502static const struct user_regset_view user_s390_compat_view = {
1503 .name = "s390",
1504 .e_machine = EM_S390,
1505 .regsets = s390_compat_regsets,
1506 .n = ARRAY_SIZE(s390_compat_regsets)
1507};
1508#endif
1509
1510const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1511{
1512#ifdef CONFIG_COMPAT
1513 if (test_tsk_thread_flag(task, TIF_31BIT))
1514 return &user_s390_compat_view;
1515#endif
1516 return &user_s390_view;
1517}
1518
1519static const char *gpr_names[NUM_GPRS] = {
1520 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1521 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1522};
1523
1524unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1525{
1526 if (offset >= NUM_GPRS)
1527 return 0;
1528 return regs->gprs[offset];
1529}
1530
1531int regs_query_register_offset(const char *name)
1532{
1533 unsigned long offset;
1534
1535 if (!name || *name != 'r')
1536 return -EINVAL;
1537 if (kstrtoul(name + 1, 10, &offset))
1538 return -EINVAL;
1539 if (offset >= NUM_GPRS)
1540 return -EINVAL;
1541 return offset;
1542}
1543
1544const char *regs_query_register_name(unsigned int offset)
1545{
1546 if (offset >= NUM_GPRS)
1547 return NULL;
1548 return gpr_names[offset];
1549}
1550
1551static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1552{
1553 unsigned long ksp = kernel_stack_pointer(regs);
1554
1555 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1556}
1557
1558/**
1559 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1560 * @regs:pt_regs which contains kernel stack pointer.
1561 * @n:stack entry number.
1562 *
1563 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1564 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1565 * this returns 0.
1566 */
1567unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1568{
1569 unsigned long addr;
1570
1571 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1572 if (!regs_within_kernel_stack(regs, addr))
1573 return 0;
1574 return *(unsigned long *)addr;
1575}
1/*
2 * Ptrace user space interface.
3 *
4 * Copyright IBM Corp. 1999, 2010
5 * Author(s): Denis Joseph Barrow
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/smp.h>
13#include <linux/errno.h>
14#include <linux/ptrace.h>
15#include <linux/user.h>
16#include <linux/security.h>
17#include <linux/audit.h>
18#include <linux/signal.h>
19#include <linux/elf.h>
20#include <linux/regset.h>
21#include <linux/tracehook.h>
22#include <linux/seccomp.h>
23#include <linux/compat.h>
24#include <trace/syscall.h>
25#include <asm/segment.h>
26#include <asm/page.h>
27#include <asm/pgtable.h>
28#include <asm/pgalloc.h>
29#include <linux/uaccess.h>
30#include <asm/unistd.h>
31#include <asm/switch_to.h>
32#include "entry.h"
33
34#ifdef CONFIG_COMPAT
35#include "compat_ptrace.h"
36#endif
37
38#define CREATE_TRACE_POINTS
39#include <trace/events/syscalls.h>
40
41void update_cr_regs(struct task_struct *task)
42{
43 struct pt_regs *regs = task_pt_regs(task);
44 struct thread_struct *thread = &task->thread;
45 struct per_regs old, new;
46
47 /* Take care of the enable/disable of transactional execution. */
48 if (MACHINE_HAS_TE) {
49 unsigned long cr, cr_new;
50
51 __ctl_store(cr, 0, 0);
52 /* Set or clear transaction execution TXC bit 8. */
53 cr_new = cr | (1UL << 55);
54 if (task->thread.per_flags & PER_FLAG_NO_TE)
55 cr_new &= ~(1UL << 55);
56 if (cr_new != cr)
57 __ctl_load(cr_new, 0, 0);
58 /* Set or clear transaction execution TDC bits 62 and 63. */
59 __ctl_store(cr, 2, 2);
60 cr_new = cr & ~3UL;
61 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
62 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
63 cr_new |= 1UL;
64 else
65 cr_new |= 2UL;
66 }
67 if (cr_new != cr)
68 __ctl_load(cr_new, 2, 2);
69 }
70 /* Copy user specified PER registers */
71 new.control = thread->per_user.control;
72 new.start = thread->per_user.start;
73 new.end = thread->per_user.end;
74
75 /* merge TIF_SINGLE_STEP into user specified PER registers. */
76 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
77 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
78 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
79 new.control |= PER_EVENT_BRANCH;
80 else
81 new.control |= PER_EVENT_IFETCH;
82 new.control |= PER_CONTROL_SUSPENSION;
83 new.control |= PER_EVENT_TRANSACTION_END;
84 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
85 new.control |= PER_EVENT_IFETCH;
86 new.start = 0;
87 new.end = -1UL;
88 }
89
90 /* Take care of the PER enablement bit in the PSW. */
91 if (!(new.control & PER_EVENT_MASK)) {
92 regs->psw.mask &= ~PSW_MASK_PER;
93 return;
94 }
95 regs->psw.mask |= PSW_MASK_PER;
96 __ctl_store(old, 9, 11);
97 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
98 __ctl_load(new, 9, 11);
99}
100
101void user_enable_single_step(struct task_struct *task)
102{
103 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
104 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
105}
106
107void user_disable_single_step(struct task_struct *task)
108{
109 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
110 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
111}
112
113void user_enable_block_step(struct task_struct *task)
114{
115 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
116 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
117}
118
119/*
120 * Called by kernel/ptrace.c when detaching..
121 *
122 * Clear all debugging related fields.
123 */
124void ptrace_disable(struct task_struct *task)
125{
126 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
127 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
128 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
129 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
130 task->thread.per_flags = 0;
131}
132
133#define __ADDR_MASK 7
134
135static inline unsigned long __peek_user_per(struct task_struct *child,
136 addr_t addr)
137{
138 struct per_struct_kernel *dummy = NULL;
139
140 if (addr == (addr_t) &dummy->cr9)
141 /* Control bits of the active per set. */
142 return test_thread_flag(TIF_SINGLE_STEP) ?
143 PER_EVENT_IFETCH : child->thread.per_user.control;
144 else if (addr == (addr_t) &dummy->cr10)
145 /* Start address of the active per set. */
146 return test_thread_flag(TIF_SINGLE_STEP) ?
147 0 : child->thread.per_user.start;
148 else if (addr == (addr_t) &dummy->cr11)
149 /* End address of the active per set. */
150 return test_thread_flag(TIF_SINGLE_STEP) ?
151 -1UL : child->thread.per_user.end;
152 else if (addr == (addr_t) &dummy->bits)
153 /* Single-step bit. */
154 return test_thread_flag(TIF_SINGLE_STEP) ?
155 (1UL << (BITS_PER_LONG - 1)) : 0;
156 else if (addr == (addr_t) &dummy->starting_addr)
157 /* Start address of the user specified per set. */
158 return child->thread.per_user.start;
159 else if (addr == (addr_t) &dummy->ending_addr)
160 /* End address of the user specified per set. */
161 return child->thread.per_user.end;
162 else if (addr == (addr_t) &dummy->perc_atmid)
163 /* PER code, ATMID and AI of the last PER trap */
164 return (unsigned long)
165 child->thread.per_event.cause << (BITS_PER_LONG - 16);
166 else if (addr == (addr_t) &dummy->address)
167 /* Address of the last PER trap */
168 return child->thread.per_event.address;
169 else if (addr == (addr_t) &dummy->access_id)
170 /* Access id of the last PER trap */
171 return (unsigned long)
172 child->thread.per_event.paid << (BITS_PER_LONG - 8);
173 return 0;
174}
175
176/*
177 * Read the word at offset addr from the user area of a process. The
178 * trouble here is that the information is littered over different
179 * locations. The process registers are found on the kernel stack,
180 * the floating point stuff and the trace settings are stored in
181 * the task structure. In addition the different structures in
182 * struct user contain pad bytes that should be read as zeroes.
183 * Lovely...
184 */
185static unsigned long __peek_user(struct task_struct *child, addr_t addr)
186{
187 struct user *dummy = NULL;
188 addr_t offset, tmp;
189
190 if (addr < (addr_t) &dummy->regs.acrs) {
191 /*
192 * psw and gprs are stored on the stack
193 */
194 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
195 if (addr == (addr_t) &dummy->regs.psw.mask) {
196 /* Return a clean psw mask. */
197 tmp &= PSW_MASK_USER | PSW_MASK_RI;
198 tmp |= PSW_USER_BITS;
199 }
200
201 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
202 /*
203 * access registers are stored in the thread structure
204 */
205 offset = addr - (addr_t) &dummy->regs.acrs;
206 /*
207 * Very special case: old & broken 64 bit gdb reading
208 * from acrs[15]. Result is a 64 bit value. Read the
209 * 32 bit acrs[15] value and shift it by 32. Sick...
210 */
211 if (addr == (addr_t) &dummy->regs.acrs[15])
212 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
213 else
214 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
215
216 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
217 /*
218 * orig_gpr2 is stored on the kernel stack
219 */
220 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
221
222 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
223 /*
224 * prevent reads of padding hole between
225 * orig_gpr2 and fp_regs on s390.
226 */
227 tmp = 0;
228
229 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
230 /*
231 * floating point control reg. is in the thread structure
232 */
233 tmp = child->thread.fpu.fpc;
234 tmp <<= BITS_PER_LONG - 32;
235
236 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
237 /*
238 * floating point regs. are either in child->thread.fpu
239 * or the child->thread.fpu.vxrs array
240 */
241 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
242 if (MACHINE_HAS_VX)
243 tmp = *(addr_t *)
244 ((addr_t) child->thread.fpu.vxrs + 2*offset);
245 else
246 tmp = *(addr_t *)
247 ((addr_t) child->thread.fpu.fprs + offset);
248
249 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
250 /*
251 * Handle access to the per_info structure.
252 */
253 addr -= (addr_t) &dummy->regs.per_info;
254 tmp = __peek_user_per(child, addr);
255
256 } else
257 tmp = 0;
258
259 return tmp;
260}
261
262static int
263peek_user(struct task_struct *child, addr_t addr, addr_t data)
264{
265 addr_t tmp, mask;
266
267 /*
268 * Stupid gdb peeks/pokes the access registers in 64 bit with
269 * an alignment of 4. Programmers from hell...
270 */
271 mask = __ADDR_MASK;
272 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
273 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
274 mask = 3;
275 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
276 return -EIO;
277
278 tmp = __peek_user(child, addr);
279 return put_user(tmp, (addr_t __user *) data);
280}
281
282static inline void __poke_user_per(struct task_struct *child,
283 addr_t addr, addr_t data)
284{
285 struct per_struct_kernel *dummy = NULL;
286
287 /*
288 * There are only three fields in the per_info struct that the
289 * debugger user can write to.
290 * 1) cr9: the debugger wants to set a new PER event mask
291 * 2) starting_addr: the debugger wants to set a new starting
292 * address to use with the PER event mask.
293 * 3) ending_addr: the debugger wants to set a new ending
294 * address to use with the PER event mask.
295 * The user specified PER event mask and the start and end
296 * addresses are used only if single stepping is not in effect.
297 * Writes to any other field in per_info are ignored.
298 */
299 if (addr == (addr_t) &dummy->cr9)
300 /* PER event mask of the user specified per set. */
301 child->thread.per_user.control =
302 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
303 else if (addr == (addr_t) &dummy->starting_addr)
304 /* Starting address of the user specified per set. */
305 child->thread.per_user.start = data;
306 else if (addr == (addr_t) &dummy->ending_addr)
307 /* Ending address of the user specified per set. */
308 child->thread.per_user.end = data;
309}
310
311/*
312 * Write a word to the user area of a process at location addr. This
313 * operation does have an additional problem compared to peek_user.
314 * Stores to the program status word and on the floating point
315 * control register needs to get checked for validity.
316 */
317static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
318{
319 struct user *dummy = NULL;
320 addr_t offset;
321
322 if (addr < (addr_t) &dummy->regs.acrs) {
323 /*
324 * psw and gprs are stored on the stack
325 */
326 if (addr == (addr_t) &dummy->regs.psw.mask) {
327 unsigned long mask = PSW_MASK_USER;
328
329 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
330 if ((data ^ PSW_USER_BITS) & ~mask)
331 /* Invalid psw mask. */
332 return -EINVAL;
333 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
334 /* Invalid address-space-control bits */
335 return -EINVAL;
336 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
337 /* Invalid addressing mode bits */
338 return -EINVAL;
339 }
340 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
341
342 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
343 /*
344 * access registers are stored in the thread structure
345 */
346 offset = addr - (addr_t) &dummy->regs.acrs;
347 /*
348 * Very special case: old & broken 64 bit gdb writing
349 * to acrs[15] with a 64 bit value. Ignore the lower
350 * half of the value and write the upper 32 bit to
351 * acrs[15]. Sick...
352 */
353 if (addr == (addr_t) &dummy->regs.acrs[15])
354 child->thread.acrs[15] = (unsigned int) (data >> 32);
355 else
356 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
357
358 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
359 /*
360 * orig_gpr2 is stored on the kernel stack
361 */
362 task_pt_regs(child)->orig_gpr2 = data;
363
364 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
365 /*
366 * prevent writes of padding hole between
367 * orig_gpr2 and fp_regs on s390.
368 */
369 return 0;
370
371 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
372 /*
373 * floating point control reg. is in the thread structure
374 */
375 if ((unsigned int) data != 0 ||
376 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
377 return -EINVAL;
378 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
379
380 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
381 /*
382 * floating point regs. are either in child->thread.fpu
383 * or the child->thread.fpu.vxrs array
384 */
385 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
386 if (MACHINE_HAS_VX)
387 *(addr_t *)((addr_t)
388 child->thread.fpu.vxrs + 2*offset) = data;
389 else
390 *(addr_t *)((addr_t)
391 child->thread.fpu.fprs + offset) = data;
392
393 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
394 /*
395 * Handle access to the per_info structure.
396 */
397 addr -= (addr_t) &dummy->regs.per_info;
398 __poke_user_per(child, addr, data);
399
400 }
401
402 return 0;
403}
404
405static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
406{
407 addr_t mask;
408
409 /*
410 * Stupid gdb peeks/pokes the access registers in 64 bit with
411 * an alignment of 4. Programmers from hell indeed...
412 */
413 mask = __ADDR_MASK;
414 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
415 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
416 mask = 3;
417 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
418 return -EIO;
419
420 return __poke_user(child, addr, data);
421}
422
423long arch_ptrace(struct task_struct *child, long request,
424 unsigned long addr, unsigned long data)
425{
426 ptrace_area parea;
427 int copied, ret;
428
429 switch (request) {
430 case PTRACE_PEEKUSR:
431 /* read the word at location addr in the USER area. */
432 return peek_user(child, addr, data);
433
434 case PTRACE_POKEUSR:
435 /* write the word at location addr in the USER area */
436 return poke_user(child, addr, data);
437
438 case PTRACE_PEEKUSR_AREA:
439 case PTRACE_POKEUSR_AREA:
440 if (copy_from_user(&parea, (void __force __user *) addr,
441 sizeof(parea)))
442 return -EFAULT;
443 addr = parea.kernel_addr;
444 data = parea.process_addr;
445 copied = 0;
446 while (copied < parea.len) {
447 if (request == PTRACE_PEEKUSR_AREA)
448 ret = peek_user(child, addr, data);
449 else {
450 addr_t utmp;
451 if (get_user(utmp,
452 (addr_t __force __user *) data))
453 return -EFAULT;
454 ret = poke_user(child, addr, utmp);
455 }
456 if (ret)
457 return ret;
458 addr += sizeof(unsigned long);
459 data += sizeof(unsigned long);
460 copied += sizeof(unsigned long);
461 }
462 return 0;
463 case PTRACE_GET_LAST_BREAK:
464 put_user(child->thread.last_break,
465 (unsigned long __user *) data);
466 return 0;
467 case PTRACE_ENABLE_TE:
468 if (!MACHINE_HAS_TE)
469 return -EIO;
470 child->thread.per_flags &= ~PER_FLAG_NO_TE;
471 return 0;
472 case PTRACE_DISABLE_TE:
473 if (!MACHINE_HAS_TE)
474 return -EIO;
475 child->thread.per_flags |= PER_FLAG_NO_TE;
476 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
477 return 0;
478 case PTRACE_TE_ABORT_RAND:
479 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
480 return -EIO;
481 switch (data) {
482 case 0UL:
483 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
484 break;
485 case 1UL:
486 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
487 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
488 break;
489 case 2UL:
490 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
491 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
492 break;
493 default:
494 return -EINVAL;
495 }
496 return 0;
497 default:
498 return ptrace_request(child, request, addr, data);
499 }
500}
501
502#ifdef CONFIG_COMPAT
503/*
504 * Now the fun part starts... a 31 bit program running in the
505 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
506 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
507 * to handle, the difference to the 64 bit versions of the requests
508 * is that the access is done in multiples of 4 byte instead of
509 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
510 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
511 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
512 * is a 31 bit program too, the content of struct user can be
513 * emulated. A 31 bit program peeking into the struct user of
514 * a 64 bit program is a no-no.
515 */
516
517/*
518 * Same as peek_user_per but for a 31 bit program.
519 */
520static inline __u32 __peek_user_per_compat(struct task_struct *child,
521 addr_t addr)
522{
523 struct compat_per_struct_kernel *dummy32 = NULL;
524
525 if (addr == (addr_t) &dummy32->cr9)
526 /* Control bits of the active per set. */
527 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
528 PER_EVENT_IFETCH : child->thread.per_user.control;
529 else if (addr == (addr_t) &dummy32->cr10)
530 /* Start address of the active per set. */
531 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
532 0 : child->thread.per_user.start;
533 else if (addr == (addr_t) &dummy32->cr11)
534 /* End address of the active per set. */
535 return test_thread_flag(TIF_SINGLE_STEP) ?
536 PSW32_ADDR_INSN : child->thread.per_user.end;
537 else if (addr == (addr_t) &dummy32->bits)
538 /* Single-step bit. */
539 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
540 0x80000000 : 0;
541 else if (addr == (addr_t) &dummy32->starting_addr)
542 /* Start address of the user specified per set. */
543 return (__u32) child->thread.per_user.start;
544 else if (addr == (addr_t) &dummy32->ending_addr)
545 /* End address of the user specified per set. */
546 return (__u32) child->thread.per_user.end;
547 else if (addr == (addr_t) &dummy32->perc_atmid)
548 /* PER code, ATMID and AI of the last PER trap */
549 return (__u32) child->thread.per_event.cause << 16;
550 else if (addr == (addr_t) &dummy32->address)
551 /* Address of the last PER trap */
552 return (__u32) child->thread.per_event.address;
553 else if (addr == (addr_t) &dummy32->access_id)
554 /* Access id of the last PER trap */
555 return (__u32) child->thread.per_event.paid << 24;
556 return 0;
557}
558
559/*
560 * Same as peek_user but for a 31 bit program.
561 */
562static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
563{
564 struct compat_user *dummy32 = NULL;
565 addr_t offset;
566 __u32 tmp;
567
568 if (addr < (addr_t) &dummy32->regs.acrs) {
569 struct pt_regs *regs = task_pt_regs(child);
570 /*
571 * psw and gprs are stored on the stack
572 */
573 if (addr == (addr_t) &dummy32->regs.psw.mask) {
574 /* Fake a 31 bit psw mask. */
575 tmp = (__u32)(regs->psw.mask >> 32);
576 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
577 tmp |= PSW32_USER_BITS;
578 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
579 /* Fake a 31 bit psw address. */
580 tmp = (__u32) regs->psw.addr |
581 (__u32)(regs->psw.mask & PSW_MASK_BA);
582 } else {
583 /* gpr 0-15 */
584 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
585 }
586 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
587 /*
588 * access registers are stored in the thread structure
589 */
590 offset = addr - (addr_t) &dummy32->regs.acrs;
591 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
592
593 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
594 /*
595 * orig_gpr2 is stored on the kernel stack
596 */
597 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
598
599 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
600 /*
601 * prevent reads of padding hole between
602 * orig_gpr2 and fp_regs on s390.
603 */
604 tmp = 0;
605
606 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
607 /*
608 * floating point control reg. is in the thread structure
609 */
610 tmp = child->thread.fpu.fpc;
611
612 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
613 /*
614 * floating point regs. are either in child->thread.fpu
615 * or the child->thread.fpu.vxrs array
616 */
617 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
618 if (MACHINE_HAS_VX)
619 tmp = *(__u32 *)
620 ((addr_t) child->thread.fpu.vxrs + 2*offset);
621 else
622 tmp = *(__u32 *)
623 ((addr_t) child->thread.fpu.fprs + offset);
624
625 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
626 /*
627 * Handle access to the per_info structure.
628 */
629 addr -= (addr_t) &dummy32->regs.per_info;
630 tmp = __peek_user_per_compat(child, addr);
631
632 } else
633 tmp = 0;
634
635 return tmp;
636}
637
638static int peek_user_compat(struct task_struct *child,
639 addr_t addr, addr_t data)
640{
641 __u32 tmp;
642
643 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
644 return -EIO;
645
646 tmp = __peek_user_compat(child, addr);
647 return put_user(tmp, (__u32 __user *) data);
648}
649
650/*
651 * Same as poke_user_per but for a 31 bit program.
652 */
653static inline void __poke_user_per_compat(struct task_struct *child,
654 addr_t addr, __u32 data)
655{
656 struct compat_per_struct_kernel *dummy32 = NULL;
657
658 if (addr == (addr_t) &dummy32->cr9)
659 /* PER event mask of the user specified per set. */
660 child->thread.per_user.control =
661 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
662 else if (addr == (addr_t) &dummy32->starting_addr)
663 /* Starting address of the user specified per set. */
664 child->thread.per_user.start = data;
665 else if (addr == (addr_t) &dummy32->ending_addr)
666 /* Ending address of the user specified per set. */
667 child->thread.per_user.end = data;
668}
669
670/*
671 * Same as poke_user but for a 31 bit program.
672 */
673static int __poke_user_compat(struct task_struct *child,
674 addr_t addr, addr_t data)
675{
676 struct compat_user *dummy32 = NULL;
677 __u32 tmp = (__u32) data;
678 addr_t offset;
679
680 if (addr < (addr_t) &dummy32->regs.acrs) {
681 struct pt_regs *regs = task_pt_regs(child);
682 /*
683 * psw, gprs, acrs and orig_gpr2 are stored on the stack
684 */
685 if (addr == (addr_t) &dummy32->regs.psw.mask) {
686 __u32 mask = PSW32_MASK_USER;
687
688 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
689 /* Build a 64 bit psw mask from 31 bit mask. */
690 if ((tmp ^ PSW32_USER_BITS) & ~mask)
691 /* Invalid psw mask. */
692 return -EINVAL;
693 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
694 /* Invalid address-space-control bits */
695 return -EINVAL;
696 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
697 (regs->psw.mask & PSW_MASK_BA) |
698 (__u64)(tmp & mask) << 32;
699 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
700 /* Build a 64 bit psw address from 31 bit address. */
701 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
702 /* Transfer 31 bit amode bit to psw mask. */
703 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
704 (__u64)(tmp & PSW32_ADDR_AMODE);
705 } else {
706 /* gpr 0-15 */
707 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
708 }
709 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
710 /*
711 * access registers are stored in the thread structure
712 */
713 offset = addr - (addr_t) &dummy32->regs.acrs;
714 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
715
716 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
717 /*
718 * orig_gpr2 is stored on the kernel stack
719 */
720 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
721
722 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
723 /*
724 * prevent writess of padding hole between
725 * orig_gpr2 and fp_regs on s390.
726 */
727 return 0;
728
729 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
730 /*
731 * floating point control reg. is in the thread structure
732 */
733 if (test_fp_ctl(tmp))
734 return -EINVAL;
735 child->thread.fpu.fpc = data;
736
737 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
738 /*
739 * floating point regs. are either in child->thread.fpu
740 * or the child->thread.fpu.vxrs array
741 */
742 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
743 if (MACHINE_HAS_VX)
744 *(__u32 *)((addr_t)
745 child->thread.fpu.vxrs + 2*offset) = tmp;
746 else
747 *(__u32 *)((addr_t)
748 child->thread.fpu.fprs + offset) = tmp;
749
750 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
751 /*
752 * Handle access to the per_info structure.
753 */
754 addr -= (addr_t) &dummy32->regs.per_info;
755 __poke_user_per_compat(child, addr, data);
756 }
757
758 return 0;
759}
760
761static int poke_user_compat(struct task_struct *child,
762 addr_t addr, addr_t data)
763{
764 if (!is_compat_task() || (addr & 3) ||
765 addr > sizeof(struct compat_user) - 3)
766 return -EIO;
767
768 return __poke_user_compat(child, addr, data);
769}
770
771long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
772 compat_ulong_t caddr, compat_ulong_t cdata)
773{
774 unsigned long addr = caddr;
775 unsigned long data = cdata;
776 compat_ptrace_area parea;
777 int copied, ret;
778
779 switch (request) {
780 case PTRACE_PEEKUSR:
781 /* read the word at location addr in the USER area. */
782 return peek_user_compat(child, addr, data);
783
784 case PTRACE_POKEUSR:
785 /* write the word at location addr in the USER area */
786 return poke_user_compat(child, addr, data);
787
788 case PTRACE_PEEKUSR_AREA:
789 case PTRACE_POKEUSR_AREA:
790 if (copy_from_user(&parea, (void __force __user *) addr,
791 sizeof(parea)))
792 return -EFAULT;
793 addr = parea.kernel_addr;
794 data = parea.process_addr;
795 copied = 0;
796 while (copied < parea.len) {
797 if (request == PTRACE_PEEKUSR_AREA)
798 ret = peek_user_compat(child, addr, data);
799 else {
800 __u32 utmp;
801 if (get_user(utmp,
802 (__u32 __force __user *) data))
803 return -EFAULT;
804 ret = poke_user_compat(child, addr, utmp);
805 }
806 if (ret)
807 return ret;
808 addr += sizeof(unsigned int);
809 data += sizeof(unsigned int);
810 copied += sizeof(unsigned int);
811 }
812 return 0;
813 case PTRACE_GET_LAST_BREAK:
814 put_user(child->thread.last_break,
815 (unsigned int __user *) data);
816 return 0;
817 }
818 return compat_ptrace_request(child, request, addr, data);
819}
820#endif
821
822asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
823{
824 unsigned long mask = -1UL;
825
826 /*
827 * The sysc_tracesys code in entry.S stored the system
828 * call number to gprs[2].
829 */
830 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
831 (tracehook_report_syscall_entry(regs) ||
832 regs->gprs[2] >= NR_syscalls)) {
833 /*
834 * Tracing decided this syscall should not happen or the
835 * debugger stored an invalid system call number. Skip
836 * the system call and the system call restart handling.
837 */
838 clear_pt_regs_flag(regs, PIF_SYSCALL);
839 return -1;
840 }
841
842 /* Do the secure computing check after ptrace. */
843 if (secure_computing(NULL)) {
844 /* seccomp failures shouldn't expose any additional code. */
845 return -1;
846 }
847
848 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
849 trace_sys_enter(regs, regs->gprs[2]);
850
851 if (is_compat_task())
852 mask = 0xffffffff;
853
854 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask,
855 regs->gprs[3] &mask, regs->gprs[4] &mask,
856 regs->gprs[5] &mask);
857
858 return regs->gprs[2];
859}
860
861asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
862{
863 audit_syscall_exit(regs);
864
865 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
866 trace_sys_exit(regs, regs->gprs[2]);
867
868 if (test_thread_flag(TIF_SYSCALL_TRACE))
869 tracehook_report_syscall_exit(regs, 0);
870}
871
872/*
873 * user_regset definitions.
874 */
875
876static int s390_regs_get(struct task_struct *target,
877 const struct user_regset *regset,
878 unsigned int pos, unsigned int count,
879 void *kbuf, void __user *ubuf)
880{
881 if (target == current)
882 save_access_regs(target->thread.acrs);
883
884 if (kbuf) {
885 unsigned long *k = kbuf;
886 while (count > 0) {
887 *k++ = __peek_user(target, pos);
888 count -= sizeof(*k);
889 pos += sizeof(*k);
890 }
891 } else {
892 unsigned long __user *u = ubuf;
893 while (count > 0) {
894 if (__put_user(__peek_user(target, pos), u++))
895 return -EFAULT;
896 count -= sizeof(*u);
897 pos += sizeof(*u);
898 }
899 }
900 return 0;
901}
902
903static int s390_regs_set(struct task_struct *target,
904 const struct user_regset *regset,
905 unsigned int pos, unsigned int count,
906 const void *kbuf, const void __user *ubuf)
907{
908 int rc = 0;
909
910 if (target == current)
911 save_access_regs(target->thread.acrs);
912
913 if (kbuf) {
914 const unsigned long *k = kbuf;
915 while (count > 0 && !rc) {
916 rc = __poke_user(target, pos, *k++);
917 count -= sizeof(*k);
918 pos += sizeof(*k);
919 }
920 } else {
921 const unsigned long __user *u = ubuf;
922 while (count > 0 && !rc) {
923 unsigned long word;
924 rc = __get_user(word, u++);
925 if (rc)
926 break;
927 rc = __poke_user(target, pos, word);
928 count -= sizeof(*u);
929 pos += sizeof(*u);
930 }
931 }
932
933 if (rc == 0 && target == current)
934 restore_access_regs(target->thread.acrs);
935
936 return rc;
937}
938
939static int s390_fpregs_get(struct task_struct *target,
940 const struct user_regset *regset, unsigned int pos,
941 unsigned int count, void *kbuf, void __user *ubuf)
942{
943 _s390_fp_regs fp_regs;
944
945 if (target == current)
946 save_fpu_regs();
947
948 fp_regs.fpc = target->thread.fpu.fpc;
949 fpregs_store(&fp_regs, &target->thread.fpu);
950
951 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
952 &fp_regs, 0, -1);
953}
954
955static int s390_fpregs_set(struct task_struct *target,
956 const struct user_regset *regset, unsigned int pos,
957 unsigned int count, const void *kbuf,
958 const void __user *ubuf)
959{
960 int rc = 0;
961 freg_t fprs[__NUM_FPRS];
962
963 if (target == current)
964 save_fpu_regs();
965
966 if (MACHINE_HAS_VX)
967 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
968 else
969 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
970
971 /* If setting FPC, must validate it first. */
972 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
973 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
974 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
975 0, offsetof(s390_fp_regs, fprs));
976 if (rc)
977 return rc;
978 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
979 return -EINVAL;
980 target->thread.fpu.fpc = ufpc[0];
981 }
982
983 if (rc == 0 && count > 0)
984 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
985 fprs, offsetof(s390_fp_regs, fprs), -1);
986 if (rc)
987 return rc;
988
989 if (MACHINE_HAS_VX)
990 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
991 else
992 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
993
994 return rc;
995}
996
997static int s390_last_break_get(struct task_struct *target,
998 const struct user_regset *regset,
999 unsigned int pos, unsigned int count,
1000 void *kbuf, void __user *ubuf)
1001{
1002 if (count > 0) {
1003 if (kbuf) {
1004 unsigned long *k = kbuf;
1005 *k = target->thread.last_break;
1006 } else {
1007 unsigned long __user *u = ubuf;
1008 if (__put_user(target->thread.last_break, u))
1009 return -EFAULT;
1010 }
1011 }
1012 return 0;
1013}
1014
1015static int s390_last_break_set(struct task_struct *target,
1016 const struct user_regset *regset,
1017 unsigned int pos, unsigned int count,
1018 const void *kbuf, const void __user *ubuf)
1019{
1020 return 0;
1021}
1022
1023static int s390_tdb_get(struct task_struct *target,
1024 const struct user_regset *regset,
1025 unsigned int pos, unsigned int count,
1026 void *kbuf, void __user *ubuf)
1027{
1028 struct pt_regs *regs = task_pt_regs(target);
1029 unsigned char *data;
1030
1031 if (!(regs->int_code & 0x200))
1032 return -ENODATA;
1033 data = target->thread.trap_tdb;
1034 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1035}
1036
1037static int s390_tdb_set(struct task_struct *target,
1038 const struct user_regset *regset,
1039 unsigned int pos, unsigned int count,
1040 const void *kbuf, const void __user *ubuf)
1041{
1042 return 0;
1043}
1044
1045static int s390_vxrs_low_get(struct task_struct *target,
1046 const struct user_regset *regset,
1047 unsigned int pos, unsigned int count,
1048 void *kbuf, void __user *ubuf)
1049{
1050 __u64 vxrs[__NUM_VXRS_LOW];
1051 int i;
1052
1053 if (!MACHINE_HAS_VX)
1054 return -ENODEV;
1055 if (target == current)
1056 save_fpu_regs();
1057 for (i = 0; i < __NUM_VXRS_LOW; i++)
1058 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1059 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1060}
1061
1062static int s390_vxrs_low_set(struct task_struct *target,
1063 const struct user_regset *regset,
1064 unsigned int pos, unsigned int count,
1065 const void *kbuf, const void __user *ubuf)
1066{
1067 __u64 vxrs[__NUM_VXRS_LOW];
1068 int i, rc;
1069
1070 if (!MACHINE_HAS_VX)
1071 return -ENODEV;
1072 if (target == current)
1073 save_fpu_regs();
1074
1075 for (i = 0; i < __NUM_VXRS_LOW; i++)
1076 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1077
1078 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1079 if (rc == 0)
1080 for (i = 0; i < __NUM_VXRS_LOW; i++)
1081 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1082
1083 return rc;
1084}
1085
1086static int s390_vxrs_high_get(struct task_struct *target,
1087 const struct user_regset *regset,
1088 unsigned int pos, unsigned int count,
1089 void *kbuf, void __user *ubuf)
1090{
1091 __vector128 vxrs[__NUM_VXRS_HIGH];
1092
1093 if (!MACHINE_HAS_VX)
1094 return -ENODEV;
1095 if (target == current)
1096 save_fpu_regs();
1097 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1098
1099 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1100}
1101
1102static int s390_vxrs_high_set(struct task_struct *target,
1103 const struct user_regset *regset,
1104 unsigned int pos, unsigned int count,
1105 const void *kbuf, const void __user *ubuf)
1106{
1107 int rc;
1108
1109 if (!MACHINE_HAS_VX)
1110 return -ENODEV;
1111 if (target == current)
1112 save_fpu_regs();
1113
1114 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1115 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1116 return rc;
1117}
1118
1119static int s390_system_call_get(struct task_struct *target,
1120 const struct user_regset *regset,
1121 unsigned int pos, unsigned int count,
1122 void *kbuf, void __user *ubuf)
1123{
1124 unsigned int *data = &target->thread.system_call;
1125 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1126 data, 0, sizeof(unsigned int));
1127}
1128
1129static int s390_system_call_set(struct task_struct *target,
1130 const struct user_regset *regset,
1131 unsigned int pos, unsigned int count,
1132 const void *kbuf, const void __user *ubuf)
1133{
1134 unsigned int *data = &target->thread.system_call;
1135 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1136 data, 0, sizeof(unsigned int));
1137}
1138
1139static const struct user_regset s390_regsets[] = {
1140 {
1141 .core_note_type = NT_PRSTATUS,
1142 .n = sizeof(s390_regs) / sizeof(long),
1143 .size = sizeof(long),
1144 .align = sizeof(long),
1145 .get = s390_regs_get,
1146 .set = s390_regs_set,
1147 },
1148 {
1149 .core_note_type = NT_PRFPREG,
1150 .n = sizeof(s390_fp_regs) / sizeof(long),
1151 .size = sizeof(long),
1152 .align = sizeof(long),
1153 .get = s390_fpregs_get,
1154 .set = s390_fpregs_set,
1155 },
1156 {
1157 .core_note_type = NT_S390_SYSTEM_CALL,
1158 .n = 1,
1159 .size = sizeof(unsigned int),
1160 .align = sizeof(unsigned int),
1161 .get = s390_system_call_get,
1162 .set = s390_system_call_set,
1163 },
1164 {
1165 .core_note_type = NT_S390_LAST_BREAK,
1166 .n = 1,
1167 .size = sizeof(long),
1168 .align = sizeof(long),
1169 .get = s390_last_break_get,
1170 .set = s390_last_break_set,
1171 },
1172 {
1173 .core_note_type = NT_S390_TDB,
1174 .n = 1,
1175 .size = 256,
1176 .align = 1,
1177 .get = s390_tdb_get,
1178 .set = s390_tdb_set,
1179 },
1180 {
1181 .core_note_type = NT_S390_VXRS_LOW,
1182 .n = __NUM_VXRS_LOW,
1183 .size = sizeof(__u64),
1184 .align = sizeof(__u64),
1185 .get = s390_vxrs_low_get,
1186 .set = s390_vxrs_low_set,
1187 },
1188 {
1189 .core_note_type = NT_S390_VXRS_HIGH,
1190 .n = __NUM_VXRS_HIGH,
1191 .size = sizeof(__vector128),
1192 .align = sizeof(__vector128),
1193 .get = s390_vxrs_high_get,
1194 .set = s390_vxrs_high_set,
1195 },
1196};
1197
1198static const struct user_regset_view user_s390_view = {
1199 .name = UTS_MACHINE,
1200 .e_machine = EM_S390,
1201 .regsets = s390_regsets,
1202 .n = ARRAY_SIZE(s390_regsets)
1203};
1204
1205#ifdef CONFIG_COMPAT
1206static int s390_compat_regs_get(struct task_struct *target,
1207 const struct user_regset *regset,
1208 unsigned int pos, unsigned int count,
1209 void *kbuf, void __user *ubuf)
1210{
1211 if (target == current)
1212 save_access_regs(target->thread.acrs);
1213
1214 if (kbuf) {
1215 compat_ulong_t *k = kbuf;
1216 while (count > 0) {
1217 *k++ = __peek_user_compat(target, pos);
1218 count -= sizeof(*k);
1219 pos += sizeof(*k);
1220 }
1221 } else {
1222 compat_ulong_t __user *u = ubuf;
1223 while (count > 0) {
1224 if (__put_user(__peek_user_compat(target, pos), u++))
1225 return -EFAULT;
1226 count -= sizeof(*u);
1227 pos += sizeof(*u);
1228 }
1229 }
1230 return 0;
1231}
1232
1233static int s390_compat_regs_set(struct task_struct *target,
1234 const struct user_regset *regset,
1235 unsigned int pos, unsigned int count,
1236 const void *kbuf, const void __user *ubuf)
1237{
1238 int rc = 0;
1239
1240 if (target == current)
1241 save_access_regs(target->thread.acrs);
1242
1243 if (kbuf) {
1244 const compat_ulong_t *k = kbuf;
1245 while (count > 0 && !rc) {
1246 rc = __poke_user_compat(target, pos, *k++);
1247 count -= sizeof(*k);
1248 pos += sizeof(*k);
1249 }
1250 } else {
1251 const compat_ulong_t __user *u = ubuf;
1252 while (count > 0 && !rc) {
1253 compat_ulong_t word;
1254 rc = __get_user(word, u++);
1255 if (rc)
1256 break;
1257 rc = __poke_user_compat(target, pos, word);
1258 count -= sizeof(*u);
1259 pos += sizeof(*u);
1260 }
1261 }
1262
1263 if (rc == 0 && target == current)
1264 restore_access_regs(target->thread.acrs);
1265
1266 return rc;
1267}
1268
1269static int s390_compat_regs_high_get(struct task_struct *target,
1270 const struct user_regset *regset,
1271 unsigned int pos, unsigned int count,
1272 void *kbuf, void __user *ubuf)
1273{
1274 compat_ulong_t *gprs_high;
1275
1276 gprs_high = (compat_ulong_t *)
1277 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1278 if (kbuf) {
1279 compat_ulong_t *k = kbuf;
1280 while (count > 0) {
1281 *k++ = *gprs_high;
1282 gprs_high += 2;
1283 count -= sizeof(*k);
1284 }
1285 } else {
1286 compat_ulong_t __user *u = ubuf;
1287 while (count > 0) {
1288 if (__put_user(*gprs_high, u++))
1289 return -EFAULT;
1290 gprs_high += 2;
1291 count -= sizeof(*u);
1292 }
1293 }
1294 return 0;
1295}
1296
1297static int s390_compat_regs_high_set(struct task_struct *target,
1298 const struct user_regset *regset,
1299 unsigned int pos, unsigned int count,
1300 const void *kbuf, const void __user *ubuf)
1301{
1302 compat_ulong_t *gprs_high;
1303 int rc = 0;
1304
1305 gprs_high = (compat_ulong_t *)
1306 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1307 if (kbuf) {
1308 const compat_ulong_t *k = kbuf;
1309 while (count > 0) {
1310 *gprs_high = *k++;
1311 *gprs_high += 2;
1312 count -= sizeof(*k);
1313 }
1314 } else {
1315 const compat_ulong_t __user *u = ubuf;
1316 while (count > 0 && !rc) {
1317 unsigned long word;
1318 rc = __get_user(word, u++);
1319 if (rc)
1320 break;
1321 *gprs_high = word;
1322 *gprs_high += 2;
1323 count -= sizeof(*u);
1324 }
1325 }
1326
1327 return rc;
1328}
1329
1330static int s390_compat_last_break_get(struct task_struct *target,
1331 const struct user_regset *regset,
1332 unsigned int pos, unsigned int count,
1333 void *kbuf, void __user *ubuf)
1334{
1335 compat_ulong_t last_break;
1336
1337 if (count > 0) {
1338 last_break = target->thread.last_break;
1339 if (kbuf) {
1340 unsigned long *k = kbuf;
1341 *k = last_break;
1342 } else {
1343 unsigned long __user *u = ubuf;
1344 if (__put_user(last_break, u))
1345 return -EFAULT;
1346 }
1347 }
1348 return 0;
1349}
1350
1351static int s390_compat_last_break_set(struct task_struct *target,
1352 const struct user_regset *regset,
1353 unsigned int pos, unsigned int count,
1354 const void *kbuf, const void __user *ubuf)
1355{
1356 return 0;
1357}
1358
1359static const struct user_regset s390_compat_regsets[] = {
1360 {
1361 .core_note_type = NT_PRSTATUS,
1362 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1363 .size = sizeof(compat_long_t),
1364 .align = sizeof(compat_long_t),
1365 .get = s390_compat_regs_get,
1366 .set = s390_compat_regs_set,
1367 },
1368 {
1369 .core_note_type = NT_PRFPREG,
1370 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1371 .size = sizeof(compat_long_t),
1372 .align = sizeof(compat_long_t),
1373 .get = s390_fpregs_get,
1374 .set = s390_fpregs_set,
1375 },
1376 {
1377 .core_note_type = NT_S390_SYSTEM_CALL,
1378 .n = 1,
1379 .size = sizeof(compat_uint_t),
1380 .align = sizeof(compat_uint_t),
1381 .get = s390_system_call_get,
1382 .set = s390_system_call_set,
1383 },
1384 {
1385 .core_note_type = NT_S390_LAST_BREAK,
1386 .n = 1,
1387 .size = sizeof(long),
1388 .align = sizeof(long),
1389 .get = s390_compat_last_break_get,
1390 .set = s390_compat_last_break_set,
1391 },
1392 {
1393 .core_note_type = NT_S390_TDB,
1394 .n = 1,
1395 .size = 256,
1396 .align = 1,
1397 .get = s390_tdb_get,
1398 .set = s390_tdb_set,
1399 },
1400 {
1401 .core_note_type = NT_S390_VXRS_LOW,
1402 .n = __NUM_VXRS_LOW,
1403 .size = sizeof(__u64),
1404 .align = sizeof(__u64),
1405 .get = s390_vxrs_low_get,
1406 .set = s390_vxrs_low_set,
1407 },
1408 {
1409 .core_note_type = NT_S390_VXRS_HIGH,
1410 .n = __NUM_VXRS_HIGH,
1411 .size = sizeof(__vector128),
1412 .align = sizeof(__vector128),
1413 .get = s390_vxrs_high_get,
1414 .set = s390_vxrs_high_set,
1415 },
1416 {
1417 .core_note_type = NT_S390_HIGH_GPRS,
1418 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1419 .size = sizeof(compat_long_t),
1420 .align = sizeof(compat_long_t),
1421 .get = s390_compat_regs_high_get,
1422 .set = s390_compat_regs_high_set,
1423 },
1424};
1425
1426static const struct user_regset_view user_s390_compat_view = {
1427 .name = "s390",
1428 .e_machine = EM_S390,
1429 .regsets = s390_compat_regsets,
1430 .n = ARRAY_SIZE(s390_compat_regsets)
1431};
1432#endif
1433
1434const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1435{
1436#ifdef CONFIG_COMPAT
1437 if (test_tsk_thread_flag(task, TIF_31BIT))
1438 return &user_s390_compat_view;
1439#endif
1440 return &user_s390_view;
1441}
1442
1443static const char *gpr_names[NUM_GPRS] = {
1444 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1445 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1446};
1447
1448unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1449{
1450 if (offset >= NUM_GPRS)
1451 return 0;
1452 return regs->gprs[offset];
1453}
1454
1455int regs_query_register_offset(const char *name)
1456{
1457 unsigned long offset;
1458
1459 if (!name || *name != 'r')
1460 return -EINVAL;
1461 if (kstrtoul(name + 1, 10, &offset))
1462 return -EINVAL;
1463 if (offset >= NUM_GPRS)
1464 return -EINVAL;
1465 return offset;
1466}
1467
1468const char *regs_query_register_name(unsigned int offset)
1469{
1470 if (offset >= NUM_GPRS)
1471 return NULL;
1472 return gpr_names[offset];
1473}
1474
1475static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1476{
1477 unsigned long ksp = kernel_stack_pointer(regs);
1478
1479 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1480}
1481
1482/**
1483 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1484 * @regs:pt_regs which contains kernel stack pointer.
1485 * @n:stack entry number.
1486 *
1487 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1488 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1489 * this returns 0.
1490 */
1491unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1492{
1493 unsigned long addr;
1494
1495 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1496 if (!regs_within_kernel_stack(regs, addr))
1497 return 0;
1498 return *(unsigned long *)addr;
1499}