2 * Ptrace user space interface.
4 * Copyright IBM Corp. 1999, 2010
5 * Author(s): Denis Joseph Barrow
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 #include <linux/kernel.h>
10 #include <linux/sched.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>
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>
35 #include "compat_ptrace.h"
38 #define CREATE_TRACE_POINTS
39 #include <trace/events/syscalls.h>
41 void update_cr_regs(struct task_struct *task)
43 struct pt_regs *regs = task_pt_regs(task);
44 struct thread_struct *thread = &task->thread;
45 struct per_regs old, new;
48 /* Take care of the enable/disable of transactional execution. */
49 if (MACHINE_HAS_TE || MACHINE_HAS_VX) {
50 unsigned long cr, cr_new;
52 __ctl_store(cr, 0, 0);
55 /* Set or clear transaction execution TXC bit 8. */
56 cr_new |= (1UL << 55);
57 if (task->thread.per_flags & PER_FLAG_NO_TE)
58 cr_new &= ~(1UL << 55);
61 /* Enable/disable of vector extension */
62 cr_new &= ~(1UL << 17);
63 if (task->thread.vxrs)
64 cr_new |= (1UL << 17);
67 __ctl_load(cr_new, 0, 0);
69 /* Set/clear transaction execution TDC bits 62/63. */
70 __ctl_store(cr, 2, 2);
72 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
73 if (task->thread.per_flags &
74 PER_FLAG_TE_ABORT_RAND_TEND)
80 __ctl_load(cr_new, 2, 2);
84 /* Copy user specified PER registers */
85 new.control = thread->per_user.control;
86 new.start = thread->per_user.start;
87 new.end = thread->per_user.end;
89 /* merge TIF_SINGLE_STEP into user specified PER registers. */
90 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
91 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
92 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
93 new.control |= PER_EVENT_BRANCH;
95 new.control |= PER_EVENT_IFETCH;
97 new.control |= PER_CONTROL_SUSPENSION;
98 new.control |= PER_EVENT_TRANSACTION_END;
100 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
101 new.control |= PER_EVENT_IFETCH;
103 new.end = PSW_ADDR_INSN;
106 /* Take care of the PER enablement bit in the PSW. */
107 if (!(new.control & PER_EVENT_MASK)) {
108 regs->psw.mask &= ~PSW_MASK_PER;
111 regs->psw.mask |= PSW_MASK_PER;
112 __ctl_store(old, 9, 11);
113 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
114 __ctl_load(new, 9, 11);
117 void user_enable_single_step(struct task_struct *task)
119 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
120 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
123 void user_disable_single_step(struct task_struct *task)
125 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
126 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
129 void user_enable_block_step(struct task_struct *task)
131 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
132 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
136 * Called by kernel/ptrace.c when detaching..
138 * Clear all debugging related fields.
140 void ptrace_disable(struct task_struct *task)
142 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
143 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
144 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
145 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
146 task->thread.per_flags = 0;
150 # define __ADDR_MASK 3
152 # define __ADDR_MASK 7
155 static inline unsigned long __peek_user_per(struct task_struct *child,
158 struct per_struct_kernel *dummy = NULL;
160 if (addr == (addr_t) &dummy->cr9)
161 /* Control bits of the active per set. */
162 return test_thread_flag(TIF_SINGLE_STEP) ?
163 PER_EVENT_IFETCH : child->thread.per_user.control;
164 else if (addr == (addr_t) &dummy->cr10)
165 /* Start address of the active per set. */
166 return test_thread_flag(TIF_SINGLE_STEP) ?
167 0 : child->thread.per_user.start;
168 else if (addr == (addr_t) &dummy->cr11)
169 /* End address of the active per set. */
170 return test_thread_flag(TIF_SINGLE_STEP) ?
171 PSW_ADDR_INSN : child->thread.per_user.end;
172 else if (addr == (addr_t) &dummy->bits)
173 /* Single-step bit. */
174 return test_thread_flag(TIF_SINGLE_STEP) ?
175 (1UL << (BITS_PER_LONG - 1)) : 0;
176 else if (addr == (addr_t) &dummy->starting_addr)
177 /* Start address of the user specified per set. */
178 return child->thread.per_user.start;
179 else if (addr == (addr_t) &dummy->ending_addr)
180 /* End address of the user specified per set. */
181 return child->thread.per_user.end;
182 else if (addr == (addr_t) &dummy->perc_atmid)
183 /* PER code, ATMID and AI of the last PER trap */
184 return (unsigned long)
185 child->thread.per_event.cause << (BITS_PER_LONG - 16);
186 else if (addr == (addr_t) &dummy->address)
187 /* Address of the last PER trap */
188 return child->thread.per_event.address;
189 else if (addr == (addr_t) &dummy->access_id)
190 /* Access id of the last PER trap */
191 return (unsigned long)
192 child->thread.per_event.paid << (BITS_PER_LONG - 8);
197 * Read the word at offset addr from the user area of a process. The
198 * trouble here is that the information is littered over different
199 * locations. The process registers are found on the kernel stack,
200 * the floating point stuff and the trace settings are stored in
201 * the task structure. In addition the different structures in
202 * struct user contain pad bytes that should be read as zeroes.
205 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
207 struct user *dummy = NULL;
210 if (addr < (addr_t) &dummy->regs.acrs) {
212 * psw and gprs are stored on the stack
214 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
215 if (addr == (addr_t) &dummy->regs.psw.mask) {
216 /* Return a clean psw mask. */
217 tmp &= PSW_MASK_USER | PSW_MASK_RI;
218 tmp |= PSW_USER_BITS;
221 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
223 * access registers are stored in the thread structure
225 offset = addr - (addr_t) &dummy->regs.acrs;
228 * Very special case: old & broken 64 bit gdb reading
229 * from acrs[15]. Result is a 64 bit value. Read the
230 * 32 bit acrs[15] value and shift it by 32. Sick...
232 if (addr == (addr_t) &dummy->regs.acrs[15])
233 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
236 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
238 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
240 * orig_gpr2 is stored on the kernel stack
242 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
244 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
246 * prevent reads of padding hole between
247 * orig_gpr2 and fp_regs on s390.
251 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
253 * floating point regs. are stored in the thread structure
255 offset = addr - (addr_t) &dummy->regs.fp_regs;
256 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
257 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
258 tmp <<= BITS_PER_LONG - 32;
260 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
262 * Handle access to the per_info structure.
264 addr -= (addr_t) &dummy->regs.per_info;
265 tmp = __peek_user_per(child, addr);
274 peek_user(struct task_struct *child, addr_t addr, addr_t data)
279 * Stupid gdb peeks/pokes the access registers in 64 bit with
280 * an alignment of 4. Programmers from hell...
284 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
285 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
288 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
291 tmp = __peek_user(child, addr);
292 return put_user(tmp, (addr_t __user *) data);
295 static inline void __poke_user_per(struct task_struct *child,
296 addr_t addr, addr_t data)
298 struct per_struct_kernel *dummy = NULL;
301 * There are only three fields in the per_info struct that the
302 * debugger user can write to.
303 * 1) cr9: the debugger wants to set a new PER event mask
304 * 2) starting_addr: the debugger wants to set a new starting
305 * address to use with the PER event mask.
306 * 3) ending_addr: the debugger wants to set a new ending
307 * address to use with the PER event mask.
308 * The user specified PER event mask and the start and end
309 * addresses are used only if single stepping is not in effect.
310 * Writes to any other field in per_info are ignored.
312 if (addr == (addr_t) &dummy->cr9)
313 /* PER event mask of the user specified per set. */
314 child->thread.per_user.control =
315 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
316 else if (addr == (addr_t) &dummy->starting_addr)
317 /* Starting address of the user specified per set. */
318 child->thread.per_user.start = data;
319 else if (addr == (addr_t) &dummy->ending_addr)
320 /* Ending address of the user specified per set. */
321 child->thread.per_user.end = data;
325 * Write a word to the user area of a process at location addr. This
326 * operation does have an additional problem compared to peek_user.
327 * Stores to the program status word and on the floating point
328 * control register needs to get checked for validity.
330 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
332 struct user *dummy = NULL;
335 if (addr < (addr_t) &dummy->regs.acrs) {
337 * psw and gprs are stored on the stack
339 if (addr == (addr_t) &dummy->regs.psw.mask) {
340 unsigned long mask = PSW_MASK_USER;
342 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
343 if ((data ^ PSW_USER_BITS) & ~mask)
344 /* Invalid psw mask. */
346 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
347 /* Invalid address-space-control bits */
349 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
350 /* Invalid addressing mode bits */
353 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
355 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
357 * access registers are stored in the thread structure
359 offset = addr - (addr_t) &dummy->regs.acrs;
362 * Very special case: old & broken 64 bit gdb writing
363 * to acrs[15] with a 64 bit value. Ignore the lower
364 * half of the value and write the upper 32 bit to
367 if (addr == (addr_t) &dummy->regs.acrs[15])
368 child->thread.acrs[15] = (unsigned int) (data >> 32);
371 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
373 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
375 * orig_gpr2 is stored on the kernel stack
377 task_pt_regs(child)->orig_gpr2 = data;
379 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
381 * prevent writes of padding hole between
382 * orig_gpr2 and fp_regs on s390.
386 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
388 * floating point regs. are stored in the thread structure
390 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
391 if ((unsigned int) data != 0 ||
392 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
394 offset = addr - (addr_t) &dummy->regs.fp_regs;
395 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
397 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
399 * Handle access to the per_info structure.
401 addr -= (addr_t) &dummy->regs.per_info;
402 __poke_user_per(child, addr, data);
409 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
414 * Stupid gdb peeks/pokes the access registers in 64 bit with
415 * an alignment of 4. Programmers from hell indeed...
419 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
420 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
423 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
426 return __poke_user(child, addr, data);
429 long arch_ptrace(struct task_struct *child, long request,
430 unsigned long addr, unsigned long data)
437 /* read the word at location addr in the USER area. */
438 return peek_user(child, addr, data);
441 /* write the word at location addr in the USER area */
442 return poke_user(child, addr, data);
444 case PTRACE_PEEKUSR_AREA:
445 case PTRACE_POKEUSR_AREA:
446 if (copy_from_user(&parea, (void __force __user *) addr,
449 addr = parea.kernel_addr;
450 data = parea.process_addr;
452 while (copied < parea.len) {
453 if (request == PTRACE_PEEKUSR_AREA)
454 ret = peek_user(child, addr, data);
458 (addr_t __force __user *) data))
460 ret = poke_user(child, addr, utmp);
464 addr += sizeof(unsigned long);
465 data += sizeof(unsigned long);
466 copied += sizeof(unsigned long);
469 case PTRACE_GET_LAST_BREAK:
470 put_user(task_thread_info(child)->last_break,
471 (unsigned long __user *) data);
473 case PTRACE_ENABLE_TE:
476 child->thread.per_flags &= ~PER_FLAG_NO_TE;
478 case PTRACE_DISABLE_TE:
481 child->thread.per_flags |= PER_FLAG_NO_TE;
482 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
484 case PTRACE_TE_ABORT_RAND:
485 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
489 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
492 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
493 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
496 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
497 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
504 /* Removing high order bit from addr (only for 31 bit). */
505 addr &= PSW_ADDR_INSN;
506 return ptrace_request(child, request, addr, data);
512 * Now the fun part starts... a 31 bit program running in the
513 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
514 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
515 * to handle, the difference to the 64 bit versions of the requests
516 * is that the access is done in multiples of 4 byte instead of
517 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
518 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
519 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
520 * is a 31 bit program too, the content of struct user can be
521 * emulated. A 31 bit program peeking into the struct user of
522 * a 64 bit program is a no-no.
526 * Same as peek_user_per but for a 31 bit program.
528 static inline __u32 __peek_user_per_compat(struct task_struct *child,
531 struct compat_per_struct_kernel *dummy32 = NULL;
533 if (addr == (addr_t) &dummy32->cr9)
534 /* Control bits of the active per set. */
535 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
536 PER_EVENT_IFETCH : child->thread.per_user.control;
537 else if (addr == (addr_t) &dummy32->cr10)
538 /* Start address of the active per set. */
539 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
540 0 : child->thread.per_user.start;
541 else if (addr == (addr_t) &dummy32->cr11)
542 /* End address of the active per set. */
543 return test_thread_flag(TIF_SINGLE_STEP) ?
544 PSW32_ADDR_INSN : child->thread.per_user.end;
545 else if (addr == (addr_t) &dummy32->bits)
546 /* Single-step bit. */
547 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
549 else if (addr == (addr_t) &dummy32->starting_addr)
550 /* Start address of the user specified per set. */
551 return (__u32) child->thread.per_user.start;
552 else if (addr == (addr_t) &dummy32->ending_addr)
553 /* End address of the user specified per set. */
554 return (__u32) child->thread.per_user.end;
555 else if (addr == (addr_t) &dummy32->perc_atmid)
556 /* PER code, ATMID and AI of the last PER trap */
557 return (__u32) child->thread.per_event.cause << 16;
558 else if (addr == (addr_t) &dummy32->address)
559 /* Address of the last PER trap */
560 return (__u32) child->thread.per_event.address;
561 else if (addr == (addr_t) &dummy32->access_id)
562 /* Access id of the last PER trap */
563 return (__u32) child->thread.per_event.paid << 24;
568 * Same as peek_user but for a 31 bit program.
570 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
572 struct compat_user *dummy32 = NULL;
576 if (addr < (addr_t) &dummy32->regs.acrs) {
577 struct pt_regs *regs = task_pt_regs(child);
579 * psw and gprs are stored on the stack
581 if (addr == (addr_t) &dummy32->regs.psw.mask) {
582 /* Fake a 31 bit psw mask. */
583 tmp = (__u32)(regs->psw.mask >> 32);
584 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
585 tmp |= PSW32_USER_BITS;
586 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
587 /* Fake a 31 bit psw address. */
588 tmp = (__u32) regs->psw.addr |
589 (__u32)(regs->psw.mask & PSW_MASK_BA);
592 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
594 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
596 * access registers are stored in the thread structure
598 offset = addr - (addr_t) &dummy32->regs.acrs;
599 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
601 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
603 * orig_gpr2 is stored on the kernel stack
605 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
607 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
609 * prevent reads of padding hole between
610 * orig_gpr2 and fp_regs on s390.
614 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
616 * floating point regs. are stored in the thread structure
618 offset = addr - (addr_t) &dummy32->regs.fp_regs;
619 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
621 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
623 * Handle access to the per_info structure.
625 addr -= (addr_t) &dummy32->regs.per_info;
626 tmp = __peek_user_per_compat(child, addr);
634 static int peek_user_compat(struct task_struct *child,
635 addr_t addr, addr_t data)
639 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
642 tmp = __peek_user_compat(child, addr);
643 return put_user(tmp, (__u32 __user *) data);
647 * Same as poke_user_per but for a 31 bit program.
649 static inline void __poke_user_per_compat(struct task_struct *child,
650 addr_t addr, __u32 data)
652 struct compat_per_struct_kernel *dummy32 = NULL;
654 if (addr == (addr_t) &dummy32->cr9)
655 /* PER event mask of the user specified per set. */
656 child->thread.per_user.control =
657 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
658 else if (addr == (addr_t) &dummy32->starting_addr)
659 /* Starting address of the user specified per set. */
660 child->thread.per_user.start = data;
661 else if (addr == (addr_t) &dummy32->ending_addr)
662 /* Ending address of the user specified per set. */
663 child->thread.per_user.end = data;
667 * Same as poke_user but for a 31 bit program.
669 static int __poke_user_compat(struct task_struct *child,
670 addr_t addr, addr_t data)
672 struct compat_user *dummy32 = NULL;
673 __u32 tmp = (__u32) data;
676 if (addr < (addr_t) &dummy32->regs.acrs) {
677 struct pt_regs *regs = task_pt_regs(child);
679 * psw, gprs, acrs and orig_gpr2 are stored on the stack
681 if (addr == (addr_t) &dummy32->regs.psw.mask) {
682 __u32 mask = PSW32_MASK_USER;
684 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
685 /* Build a 64 bit psw mask from 31 bit mask. */
686 if ((tmp ^ PSW32_USER_BITS) & ~mask)
687 /* Invalid psw mask. */
689 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
690 /* Invalid address-space-control bits */
692 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
693 (regs->psw.mask & PSW_MASK_BA) |
694 (__u64)(tmp & mask) << 32;
695 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
696 /* Build a 64 bit psw address from 31 bit address. */
697 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
698 /* Transfer 31 bit amode bit to psw mask. */
699 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
700 (__u64)(tmp & PSW32_ADDR_AMODE);
703 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
705 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
707 * access registers are stored in the thread structure
709 offset = addr - (addr_t) &dummy32->regs.acrs;
710 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
712 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
714 * orig_gpr2 is stored on the kernel stack
716 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
718 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
720 * prevent writess of padding hole between
721 * orig_gpr2 and fp_regs on s390.
725 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
727 * floating point regs. are stored in the thread structure
729 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
732 offset = addr - (addr_t) &dummy32->regs.fp_regs;
733 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
735 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
737 * Handle access to the per_info structure.
739 addr -= (addr_t) &dummy32->regs.per_info;
740 __poke_user_per_compat(child, addr, data);
746 static int poke_user_compat(struct task_struct *child,
747 addr_t addr, addr_t data)
749 if (!is_compat_task() || (addr & 3) ||
750 addr > sizeof(struct compat_user) - 3)
753 return __poke_user_compat(child, addr, data);
756 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
757 compat_ulong_t caddr, compat_ulong_t cdata)
759 unsigned long addr = caddr;
760 unsigned long data = cdata;
761 compat_ptrace_area parea;
766 /* read the word at location addr in the USER area. */
767 return peek_user_compat(child, addr, data);
770 /* write the word at location addr in the USER area */
771 return poke_user_compat(child, addr, data);
773 case PTRACE_PEEKUSR_AREA:
774 case PTRACE_POKEUSR_AREA:
775 if (copy_from_user(&parea, (void __force __user *) addr,
778 addr = parea.kernel_addr;
779 data = parea.process_addr;
781 while (copied < parea.len) {
782 if (request == PTRACE_PEEKUSR_AREA)
783 ret = peek_user_compat(child, addr, data);
787 (__u32 __force __user *) data))
789 ret = poke_user_compat(child, addr, utmp);
793 addr += sizeof(unsigned int);
794 data += sizeof(unsigned int);
795 copied += sizeof(unsigned int);
798 case PTRACE_GET_LAST_BREAK:
799 put_user(task_thread_info(child)->last_break,
800 (unsigned int __user *) data);
803 return compat_ptrace_request(child, request, addr, data);
807 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
811 /* Do the secure computing check first. */
812 if (secure_computing()) {
813 /* seccomp failures shouldn't expose any additional code. */
819 * The sysc_tracesys code in entry.S stored the system
820 * call number to gprs[2].
822 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
823 (tracehook_report_syscall_entry(regs) ||
824 regs->gprs[2] >= NR_syscalls)) {
826 * Tracing decided this syscall should not happen or the
827 * debugger stored an invalid system call number. Skip
828 * the system call and the system call restart handling.
830 clear_pt_regs_flag(regs, PIF_SYSCALL);
834 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
835 trace_sys_enter(regs, regs->gprs[2]);
837 audit_syscall_entry(is_compat_task() ?
838 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
839 regs->gprs[2], regs->orig_gpr2,
840 regs->gprs[3], regs->gprs[4],
843 return ret ?: regs->gprs[2];
846 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
848 audit_syscall_exit(regs);
850 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
851 trace_sys_exit(regs, regs->gprs[2]);
853 if (test_thread_flag(TIF_SYSCALL_TRACE))
854 tracehook_report_syscall_exit(regs, 0);
858 * user_regset definitions.
861 static int s390_regs_get(struct task_struct *target,
862 const struct user_regset *regset,
863 unsigned int pos, unsigned int count,
864 void *kbuf, void __user *ubuf)
866 if (target == current)
867 save_access_regs(target->thread.acrs);
870 unsigned long *k = kbuf;
872 *k++ = __peek_user(target, pos);
877 unsigned long __user *u = ubuf;
879 if (__put_user(__peek_user(target, pos), u++))
888 static int s390_regs_set(struct task_struct *target,
889 const struct user_regset *regset,
890 unsigned int pos, unsigned int count,
891 const void *kbuf, const void __user *ubuf)
895 if (target == current)
896 save_access_regs(target->thread.acrs);
899 const unsigned long *k = kbuf;
900 while (count > 0 && !rc) {
901 rc = __poke_user(target, pos, *k++);
906 const unsigned long __user *u = ubuf;
907 while (count > 0 && !rc) {
909 rc = __get_user(word, u++);
912 rc = __poke_user(target, pos, word);
918 if (rc == 0 && target == current)
919 restore_access_regs(target->thread.acrs);
924 static int s390_fpregs_get(struct task_struct *target,
925 const struct user_regset *regset, unsigned int pos,
926 unsigned int count, void *kbuf, void __user *ubuf)
928 if (target == current) {
929 save_fp_ctl(&target->thread.fp_regs.fpc);
930 save_fp_regs(target->thread.fp_regs.fprs);
933 else if (target->thread.vxrs) {
936 for (i = 0; i < __NUM_VXRS_LOW; i++)
937 target->thread.fp_regs.fprs[i] =
938 *(freg_t *)(target->thread.vxrs + i);
941 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
942 &target->thread.fp_regs, 0, -1);
945 static int s390_fpregs_set(struct task_struct *target,
946 const struct user_regset *regset, unsigned int pos,
947 unsigned int count, const void *kbuf,
948 const void __user *ubuf)
952 if (target == current) {
953 save_fp_ctl(&target->thread.fp_regs.fpc);
954 save_fp_regs(target->thread.fp_regs.fprs);
957 /* If setting FPC, must validate it first. */
958 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
959 u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 };
960 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
961 0, offsetof(s390_fp_regs, fprs));
964 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
966 target->thread.fp_regs.fpc = ufpc[0];
969 if (rc == 0 && count > 0)
970 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
971 target->thread.fp_regs.fprs,
972 offsetof(s390_fp_regs, fprs), -1);
975 if (target == current) {
976 restore_fp_ctl(&target->thread.fp_regs.fpc);
977 restore_fp_regs(target->thread.fp_regs.fprs);
980 else if (target->thread.vxrs) {
983 for (i = 0; i < __NUM_VXRS_LOW; i++)
984 *(freg_t *)(target->thread.vxrs + i) =
985 target->thread.fp_regs.fprs[i];
995 static int s390_last_break_get(struct task_struct *target,
996 const struct user_regset *regset,
997 unsigned int pos, unsigned int count,
998 void *kbuf, void __user *ubuf)
1002 unsigned long *k = kbuf;
1003 *k = task_thread_info(target)->last_break;
1005 unsigned long __user *u = ubuf;
1006 if (__put_user(task_thread_info(target)->last_break, u))
1013 static int s390_last_break_set(struct task_struct *target,
1014 const struct user_regset *regset,
1015 unsigned int pos, unsigned int count,
1016 const void *kbuf, const void __user *ubuf)
1021 static int s390_tdb_get(struct task_struct *target,
1022 const struct user_regset *regset,
1023 unsigned int pos, unsigned int count,
1024 void *kbuf, void __user *ubuf)
1026 struct pt_regs *regs = task_pt_regs(target);
1027 unsigned char *data;
1029 if (!(regs->int_code & 0x200))
1031 data = target->thread.trap_tdb;
1032 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1035 static int s390_tdb_set(struct task_struct *target,
1036 const struct user_regset *regset,
1037 unsigned int pos, unsigned int count,
1038 const void *kbuf, const void __user *ubuf)
1043 static int s390_vxrs_active(struct task_struct *target,
1044 const struct user_regset *regset)
1046 return !!target->thread.vxrs;
1049 static int s390_vxrs_low_get(struct task_struct *target,
1050 const struct user_regset *regset,
1051 unsigned int pos, unsigned int count,
1052 void *kbuf, void __user *ubuf)
1054 __u64 vxrs[__NUM_VXRS_LOW];
1057 if (target->thread.vxrs) {
1058 if (target == current)
1059 save_vx_regs(target->thread.vxrs);
1060 for (i = 0; i < __NUM_VXRS_LOW; i++)
1061 vxrs[i] = *((__u64 *)(target->thread.vxrs + i) + 1);
1063 memset(vxrs, 0, sizeof(vxrs));
1064 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1067 static int s390_vxrs_low_set(struct task_struct *target,
1068 const struct user_regset *regset,
1069 unsigned int pos, unsigned int count,
1070 const void *kbuf, const void __user *ubuf)
1072 __u64 vxrs[__NUM_VXRS_LOW];
1075 if (!target->thread.vxrs) {
1076 rc = alloc_vector_registers(target);
1079 } else if (target == current)
1080 save_vx_regs(target->thread.vxrs);
1082 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1084 for (i = 0; i < __NUM_VXRS_LOW; i++)
1085 *((__u64 *)(target->thread.vxrs + i) + 1) = vxrs[i];
1086 if (target == current)
1087 restore_vx_regs(target->thread.vxrs);
1093 static int s390_vxrs_high_get(struct task_struct *target,
1094 const struct user_regset *regset,
1095 unsigned int pos, unsigned int count,
1096 void *kbuf, void __user *ubuf)
1098 __vector128 vxrs[__NUM_VXRS_HIGH];
1100 if (target->thread.vxrs) {
1101 if (target == current)
1102 save_vx_regs(target->thread.vxrs);
1103 memcpy(vxrs, target->thread.vxrs + __NUM_VXRS_LOW,
1106 memset(vxrs, 0, sizeof(vxrs));
1107 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1110 static int s390_vxrs_high_set(struct task_struct *target,
1111 const struct user_regset *regset,
1112 unsigned int pos, unsigned int count,
1113 const void *kbuf, const void __user *ubuf)
1117 if (!target->thread.vxrs) {
1118 rc = alloc_vector_registers(target);
1121 } else if (target == current)
1122 save_vx_regs(target->thread.vxrs);
1124 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1125 target->thread.vxrs + __NUM_VXRS_LOW, 0, -1);
1126 if (rc == 0 && target == current)
1127 restore_vx_regs(target->thread.vxrs);
1134 static int s390_system_call_get(struct task_struct *target,
1135 const struct user_regset *regset,
1136 unsigned int pos, unsigned int count,
1137 void *kbuf, void __user *ubuf)
1139 unsigned int *data = &task_thread_info(target)->system_call;
1140 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1141 data, 0, sizeof(unsigned int));
1144 static int s390_system_call_set(struct task_struct *target,
1145 const struct user_regset *regset,
1146 unsigned int pos, unsigned int count,
1147 const void *kbuf, const void __user *ubuf)
1149 unsigned int *data = &task_thread_info(target)->system_call;
1150 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1151 data, 0, sizeof(unsigned int));
1154 static const struct user_regset s390_regsets[] = {
1156 .core_note_type = NT_PRSTATUS,
1157 .n = sizeof(s390_regs) / sizeof(long),
1158 .size = sizeof(long),
1159 .align = sizeof(long),
1160 .get = s390_regs_get,
1161 .set = s390_regs_set,
1164 .core_note_type = NT_PRFPREG,
1165 .n = sizeof(s390_fp_regs) / sizeof(long),
1166 .size = sizeof(long),
1167 .align = sizeof(long),
1168 .get = s390_fpregs_get,
1169 .set = s390_fpregs_set,
1172 .core_note_type = NT_S390_SYSTEM_CALL,
1174 .size = sizeof(unsigned int),
1175 .align = sizeof(unsigned int),
1176 .get = s390_system_call_get,
1177 .set = s390_system_call_set,
1181 .core_note_type = NT_S390_LAST_BREAK,
1183 .size = sizeof(long),
1184 .align = sizeof(long),
1185 .get = s390_last_break_get,
1186 .set = s390_last_break_set,
1189 .core_note_type = NT_S390_TDB,
1193 .get = s390_tdb_get,
1194 .set = s390_tdb_set,
1197 .core_note_type = NT_S390_VXRS_LOW,
1198 .n = __NUM_VXRS_LOW,
1199 .size = sizeof(__u64),
1200 .align = sizeof(__u64),
1201 .active = s390_vxrs_active,
1202 .get = s390_vxrs_low_get,
1203 .set = s390_vxrs_low_set,
1206 .core_note_type = NT_S390_VXRS_HIGH,
1207 .n = __NUM_VXRS_HIGH,
1208 .size = sizeof(__vector128),
1209 .align = sizeof(__vector128),
1210 .active = s390_vxrs_active,
1211 .get = s390_vxrs_high_get,
1212 .set = s390_vxrs_high_set,
1217 static const struct user_regset_view user_s390_view = {
1218 .name = UTS_MACHINE,
1219 .e_machine = EM_S390,
1220 .regsets = s390_regsets,
1221 .n = ARRAY_SIZE(s390_regsets)
1224 #ifdef CONFIG_COMPAT
1225 static int s390_compat_regs_get(struct task_struct *target,
1226 const struct user_regset *regset,
1227 unsigned int pos, unsigned int count,
1228 void *kbuf, void __user *ubuf)
1230 if (target == current)
1231 save_access_regs(target->thread.acrs);
1234 compat_ulong_t *k = kbuf;
1236 *k++ = __peek_user_compat(target, pos);
1237 count -= sizeof(*k);
1241 compat_ulong_t __user *u = ubuf;
1243 if (__put_user(__peek_user_compat(target, pos), u++))
1245 count -= sizeof(*u);
1252 static int s390_compat_regs_set(struct task_struct *target,
1253 const struct user_regset *regset,
1254 unsigned int pos, unsigned int count,
1255 const void *kbuf, const void __user *ubuf)
1259 if (target == current)
1260 save_access_regs(target->thread.acrs);
1263 const compat_ulong_t *k = kbuf;
1264 while (count > 0 && !rc) {
1265 rc = __poke_user_compat(target, pos, *k++);
1266 count -= sizeof(*k);
1270 const compat_ulong_t __user *u = ubuf;
1271 while (count > 0 && !rc) {
1272 compat_ulong_t word;
1273 rc = __get_user(word, u++);
1276 rc = __poke_user_compat(target, pos, word);
1277 count -= sizeof(*u);
1282 if (rc == 0 && target == current)
1283 restore_access_regs(target->thread.acrs);
1288 static int s390_compat_regs_high_get(struct task_struct *target,
1289 const struct user_regset *regset,
1290 unsigned int pos, unsigned int count,
1291 void *kbuf, void __user *ubuf)
1293 compat_ulong_t *gprs_high;
1295 gprs_high = (compat_ulong_t *)
1296 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1298 compat_ulong_t *k = kbuf;
1302 count -= sizeof(*k);
1305 compat_ulong_t __user *u = ubuf;
1307 if (__put_user(*gprs_high, u++))
1310 count -= sizeof(*u);
1316 static int s390_compat_regs_high_set(struct task_struct *target,
1317 const struct user_regset *regset,
1318 unsigned int pos, unsigned int count,
1319 const void *kbuf, const void __user *ubuf)
1321 compat_ulong_t *gprs_high;
1324 gprs_high = (compat_ulong_t *)
1325 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1327 const compat_ulong_t *k = kbuf;
1331 count -= sizeof(*k);
1334 const compat_ulong_t __user *u = ubuf;
1335 while (count > 0 && !rc) {
1337 rc = __get_user(word, u++);
1342 count -= sizeof(*u);
1349 static int s390_compat_last_break_get(struct task_struct *target,
1350 const struct user_regset *regset,
1351 unsigned int pos, unsigned int count,
1352 void *kbuf, void __user *ubuf)
1354 compat_ulong_t last_break;
1357 last_break = task_thread_info(target)->last_break;
1359 unsigned long *k = kbuf;
1362 unsigned long __user *u = ubuf;
1363 if (__put_user(last_break, u))
1370 static int s390_compat_last_break_set(struct task_struct *target,
1371 const struct user_regset *regset,
1372 unsigned int pos, unsigned int count,
1373 const void *kbuf, const void __user *ubuf)
1378 static const struct user_regset s390_compat_regsets[] = {
1380 .core_note_type = NT_PRSTATUS,
1381 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1382 .size = sizeof(compat_long_t),
1383 .align = sizeof(compat_long_t),
1384 .get = s390_compat_regs_get,
1385 .set = s390_compat_regs_set,
1388 .core_note_type = NT_PRFPREG,
1389 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1390 .size = sizeof(compat_long_t),
1391 .align = sizeof(compat_long_t),
1392 .get = s390_fpregs_get,
1393 .set = s390_fpregs_set,
1396 .core_note_type = NT_S390_SYSTEM_CALL,
1398 .size = sizeof(compat_uint_t),
1399 .align = sizeof(compat_uint_t),
1400 .get = s390_system_call_get,
1401 .set = s390_system_call_set,
1404 .core_note_type = NT_S390_LAST_BREAK,
1406 .size = sizeof(long),
1407 .align = sizeof(long),
1408 .get = s390_compat_last_break_get,
1409 .set = s390_compat_last_break_set,
1412 .core_note_type = NT_S390_TDB,
1416 .get = s390_tdb_get,
1417 .set = s390_tdb_set,
1420 .core_note_type = NT_S390_VXRS_LOW,
1421 .n = __NUM_VXRS_LOW,
1422 .size = sizeof(__u64),
1423 .align = sizeof(__u64),
1424 .active = s390_vxrs_active,
1425 .get = s390_vxrs_low_get,
1426 .set = s390_vxrs_low_set,
1429 .core_note_type = NT_S390_VXRS_HIGH,
1430 .n = __NUM_VXRS_HIGH,
1431 .size = sizeof(__vector128),
1432 .align = sizeof(__vector128),
1433 .active = s390_vxrs_active,
1434 .get = s390_vxrs_high_get,
1435 .set = s390_vxrs_high_set,
1438 .core_note_type = NT_S390_HIGH_GPRS,
1439 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1440 .size = sizeof(compat_long_t),
1441 .align = sizeof(compat_long_t),
1442 .get = s390_compat_regs_high_get,
1443 .set = s390_compat_regs_high_set,
1447 static const struct user_regset_view user_s390_compat_view = {
1449 .e_machine = EM_S390,
1450 .regsets = s390_compat_regsets,
1451 .n = ARRAY_SIZE(s390_compat_regsets)
1455 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1457 #ifdef CONFIG_COMPAT
1458 if (test_tsk_thread_flag(task, TIF_31BIT))
1459 return &user_s390_compat_view;
1461 return &user_s390_view;
1464 static const char *gpr_names[NUM_GPRS] = {
1465 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1466 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1469 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1471 if (offset >= NUM_GPRS)
1473 return regs->gprs[offset];
1476 int regs_query_register_offset(const char *name)
1478 unsigned long offset;
1480 if (!name || *name != 'r')
1482 if (kstrtoul(name + 1, 10, &offset))
1484 if (offset >= NUM_GPRS)
1489 const char *regs_query_register_name(unsigned int offset)
1491 if (offset >= NUM_GPRS)
1493 return gpr_names[offset];
1496 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1498 unsigned long ksp = kernel_stack_pointer(regs);
1500 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1504 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1505 * @regs:pt_regs which contains kernel stack pointer.
1506 * @n:stack entry number.
1508 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1509 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1512 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1516 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1517 if (!regs_within_kernel_stack(regs, addr))
1519 return *(unsigned long *)addr;