1 // SPDX-License-Identifier: GPL-2.0
3 * Ptrace user space interface.
5 * Copyright IBM Corp. 1999, 2010
6 * Author(s): Denis Joseph Barrow
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/sched/task_stack.h>
14 #include <linux/smp.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/user.h>
18 #include <linux/security.h>
19 #include <linux/audit.h>
20 #include <linux/signal.h>
21 #include <linux/elf.h>
22 #include <linux/regset.h>
23 #include <linux/tracehook.h>
24 #include <linux/seccomp.h>
25 #include <linux/compat.h>
26 #include <trace/syscall.h>
27 #include <asm/segment.h>
29 #include <asm/pgtable.h>
30 #include <asm/pgalloc.h>
31 #include <linux/uaccess.h>
32 #include <asm/unistd.h>
33 #include <asm/switch_to.h>
34 #include <asm/runtime_instr.h>
35 #include <asm/facility.h>
40 #include "compat_ptrace.h"
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/syscalls.h>
46 void update_cr_regs(struct task_struct *task)
48 struct pt_regs *regs = task_pt_regs(task);
49 struct thread_struct *thread = &task->thread;
50 struct per_regs old, new;
51 union ctlreg0 cr0_old, cr0_new;
52 union ctlreg2 cr2_old, cr2_new;
53 int cr0_changed, cr2_changed;
55 __ctl_store(cr0_old.val, 0, 0);
56 __ctl_store(cr2_old.val, 2, 2);
59 /* Take care of the enable/disable of transactional execution. */
61 /* Set or clear transaction execution TXC bit 8. */
63 if (task->thread.per_flags & PER_FLAG_NO_TE)
65 /* Set or clear transaction execution TDC bits 62 and 63. */
67 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
68 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
74 /* Take care of enable/disable of guarded storage. */
77 if (task->thread.gs_cb)
80 /* Load control register 0/2 iff changed */
81 cr0_changed = cr0_new.val != cr0_old.val;
82 cr2_changed = cr2_new.val != cr2_old.val;
84 __ctl_load(cr0_new.val, 0, 0);
86 __ctl_load(cr2_new.val, 2, 2);
87 /* Copy user specified PER registers */
88 new.control = thread->per_user.control;
89 new.start = thread->per_user.start;
90 new.end = thread->per_user.end;
92 /* merge TIF_SINGLE_STEP into user specified PER registers. */
93 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
94 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
95 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
96 new.control |= PER_EVENT_BRANCH;
98 new.control |= PER_EVENT_IFETCH;
99 new.control |= PER_CONTROL_SUSPENSION;
100 new.control |= PER_EVENT_TRANSACTION_END;
101 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
102 new.control |= PER_EVENT_IFETCH;
107 /* Take care of the PER enablement bit in the PSW. */
108 if (!(new.control & PER_EVENT_MASK)) {
109 regs->psw.mask &= ~PSW_MASK_PER;
112 regs->psw.mask |= PSW_MASK_PER;
113 __ctl_store(old, 9, 11);
114 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
115 __ctl_load(new, 9, 11);
118 void user_enable_single_step(struct task_struct *task)
120 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
121 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
124 void user_disable_single_step(struct task_struct *task)
126 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
127 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
130 void user_enable_block_step(struct task_struct *task)
132 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
133 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
137 * Called by kernel/ptrace.c when detaching..
139 * Clear all debugging related fields.
141 void ptrace_disable(struct task_struct *task)
143 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
144 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
145 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
146 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
147 task->thread.per_flags = 0;
150 #define __ADDR_MASK 7
152 static inline unsigned long __peek_user_per(struct task_struct *child,
155 struct per_struct_kernel *dummy = NULL;
157 if (addr == (addr_t) &dummy->cr9)
158 /* Control bits of the active per set. */
159 return test_thread_flag(TIF_SINGLE_STEP) ?
160 PER_EVENT_IFETCH : child->thread.per_user.control;
161 else if (addr == (addr_t) &dummy->cr10)
162 /* Start address of the active per set. */
163 return test_thread_flag(TIF_SINGLE_STEP) ?
164 0 : child->thread.per_user.start;
165 else if (addr == (addr_t) &dummy->cr11)
166 /* End address of the active per set. */
167 return test_thread_flag(TIF_SINGLE_STEP) ?
168 -1UL : child->thread.per_user.end;
169 else if (addr == (addr_t) &dummy->bits)
170 /* Single-step bit. */
171 return test_thread_flag(TIF_SINGLE_STEP) ?
172 (1UL << (BITS_PER_LONG - 1)) : 0;
173 else if (addr == (addr_t) &dummy->starting_addr)
174 /* Start address of the user specified per set. */
175 return child->thread.per_user.start;
176 else if (addr == (addr_t) &dummy->ending_addr)
177 /* End address of the user specified per set. */
178 return child->thread.per_user.end;
179 else if (addr == (addr_t) &dummy->perc_atmid)
180 /* PER code, ATMID and AI of the last PER trap */
181 return (unsigned long)
182 child->thread.per_event.cause << (BITS_PER_LONG - 16);
183 else if (addr == (addr_t) &dummy->address)
184 /* Address of the last PER trap */
185 return child->thread.per_event.address;
186 else if (addr == (addr_t) &dummy->access_id)
187 /* Access id of the last PER trap */
188 return (unsigned long)
189 child->thread.per_event.paid << (BITS_PER_LONG - 8);
194 * Read the word at offset addr from the user area of a process. The
195 * trouble here is that the information is littered over different
196 * locations. The process registers are found on the kernel stack,
197 * the floating point stuff and the trace settings are stored in
198 * the task structure. In addition the different structures in
199 * struct user contain pad bytes that should be read as zeroes.
202 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
204 struct user *dummy = NULL;
207 if (addr < (addr_t) &dummy->regs.acrs) {
209 * psw and gprs are stored on the stack
211 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
212 if (addr == (addr_t) &dummy->regs.psw.mask) {
213 /* Return a clean psw mask. */
214 tmp &= PSW_MASK_USER | PSW_MASK_RI;
215 tmp |= PSW_USER_BITS;
218 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
220 * access registers are stored in the thread structure
222 offset = addr - (addr_t) &dummy->regs.acrs;
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...
228 if (addr == (addr_t) &dummy->regs.acrs[15])
229 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
231 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
233 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
235 * orig_gpr2 is stored on the kernel stack
237 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
239 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
241 * prevent reads of padding hole between
242 * orig_gpr2 and fp_regs on s390.
246 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
248 * floating point control reg. is in the thread structure
250 tmp = child->thread.fpu.fpc;
251 tmp <<= BITS_PER_LONG - 32;
253 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
255 * floating point regs. are either in child->thread.fpu
256 * or the child->thread.fpu.vxrs array
258 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
261 ((addr_t) child->thread.fpu.vxrs + 2*offset);
264 ((addr_t) child->thread.fpu.fprs + offset);
266 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
268 * Handle access to the per_info structure.
270 addr -= (addr_t) &dummy->regs.per_info;
271 tmp = __peek_user_per(child, addr);
280 peek_user(struct task_struct *child, addr_t addr, addr_t data)
285 * Stupid gdb peeks/pokes the access registers in 64 bit with
286 * an alignment of 4. Programmers from hell...
289 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
290 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
292 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
295 tmp = __peek_user(child, addr);
296 return put_user(tmp, (addr_t __user *) data);
299 static inline void __poke_user_per(struct task_struct *child,
300 addr_t addr, addr_t data)
302 struct per_struct_kernel *dummy = NULL;
305 * There are only three fields in the per_info struct that the
306 * debugger user can write to.
307 * 1) cr9: the debugger wants to set a new PER event mask
308 * 2) starting_addr: the debugger wants to set a new starting
309 * address to use with the PER event mask.
310 * 3) ending_addr: the debugger wants to set a new ending
311 * address to use with the PER event mask.
312 * The user specified PER event mask and the start and end
313 * addresses are used only if single stepping is not in effect.
314 * Writes to any other field in per_info are ignored.
316 if (addr == (addr_t) &dummy->cr9)
317 /* PER event mask of the user specified per set. */
318 child->thread.per_user.control =
319 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
320 else if (addr == (addr_t) &dummy->starting_addr)
321 /* Starting address of the user specified per set. */
322 child->thread.per_user.start = data;
323 else if (addr == (addr_t) &dummy->ending_addr)
324 /* Ending address of the user specified per set. */
325 child->thread.per_user.end = data;
328 static void fixup_int_code(struct task_struct *child, addr_t data)
330 struct pt_regs *regs = task_pt_regs(child);
331 int ilc = regs->int_code >> 16;
337 if (ptrace_access_vm(child, regs->psw.addr - (regs->int_code >> 16),
338 &insn, sizeof(insn), FOLL_FORCE) != sizeof(insn))
341 /* double check that tracee stopped on svc instruction */
342 if ((insn >> 8) != 0xa)
345 regs->int_code = 0x20000 | (data & 0xffff);
348 * Write a word to the user area of a process at location addr. This
349 * operation does have an additional problem compared to peek_user.
350 * Stores to the program status word and on the floating point
351 * control register needs to get checked for validity.
353 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
355 struct user *dummy = NULL;
359 if (addr < (addr_t) &dummy->regs.acrs) {
360 struct pt_regs *regs = task_pt_regs(child);
362 * psw and gprs are stored on the stack
364 if (addr == (addr_t) &dummy->regs.psw.mask) {
365 unsigned long mask = PSW_MASK_USER;
367 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
368 if ((data ^ PSW_USER_BITS) & ~mask)
369 /* Invalid psw mask. */
371 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
372 /* Invalid address-space-control bits */
374 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
375 /* Invalid addressing mode bits */
379 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
380 addr == offsetof(struct user, regs.gprs[2]))
381 fixup_int_code(child, data);
382 *(addr_t *)((addr_t) ®s->psw + addr) = data;
384 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
386 * access registers are stored in the thread structure
388 offset = addr - (addr_t) &dummy->regs.acrs;
390 * Very special case: old & broken 64 bit gdb writing
391 * to acrs[15] with a 64 bit value. Ignore the lower
392 * half of the value and write the upper 32 bit to
395 if (addr == (addr_t) &dummy->regs.acrs[15])
396 child->thread.acrs[15] = (unsigned int) (data >> 32);
398 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
400 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
402 * orig_gpr2 is stored on the kernel stack
404 task_pt_regs(child)->orig_gpr2 = data;
406 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
408 * prevent writes of padding hole between
409 * orig_gpr2 and fp_regs on s390.
413 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
415 * floating point control reg. is in the thread structure
417 if ((unsigned int) data != 0 ||
418 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
420 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
422 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
424 * floating point regs. are either in child->thread.fpu
425 * or the child->thread.fpu.vxrs array
427 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
430 child->thread.fpu.vxrs + 2*offset) = data;
433 child->thread.fpu.fprs + offset) = data;
435 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
437 * Handle access to the per_info structure.
439 addr -= (addr_t) &dummy->regs.per_info;
440 __poke_user_per(child, addr, data);
447 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
452 * Stupid gdb peeks/pokes the access registers in 64 bit with
453 * an alignment of 4. Programmers from hell indeed...
456 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
457 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
459 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
462 return __poke_user(child, addr, data);
465 long arch_ptrace(struct task_struct *child, long request,
466 unsigned long addr, unsigned long data)
473 /* read the word at location addr in the USER area. */
474 return peek_user(child, addr, data);
477 /* write the word at location addr in the USER area */
478 return poke_user(child, addr, data);
480 case PTRACE_PEEKUSR_AREA:
481 case PTRACE_POKEUSR_AREA:
482 if (copy_from_user(&parea, (void __force __user *) addr,
485 addr = parea.kernel_addr;
486 data = parea.process_addr;
488 while (copied < parea.len) {
489 if (request == PTRACE_PEEKUSR_AREA)
490 ret = peek_user(child, addr, data);
494 (addr_t __force __user *) data))
496 ret = poke_user(child, addr, utmp);
500 addr += sizeof(unsigned long);
501 data += sizeof(unsigned long);
502 copied += sizeof(unsigned long);
505 case PTRACE_GET_LAST_BREAK:
506 put_user(child->thread.last_break,
507 (unsigned long __user *) data);
509 case PTRACE_ENABLE_TE:
512 child->thread.per_flags &= ~PER_FLAG_NO_TE;
514 case PTRACE_DISABLE_TE:
517 child->thread.per_flags |= PER_FLAG_NO_TE;
518 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
520 case PTRACE_TE_ABORT_RAND:
521 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
525 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
528 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
529 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
532 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
533 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
540 return ptrace_request(child, request, addr, data);
546 * Now the fun part starts... a 31 bit program running in the
547 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
548 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
549 * to handle, the difference to the 64 bit versions of the requests
550 * is that the access is done in multiples of 4 byte instead of
551 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
552 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
553 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
554 * is a 31 bit program too, the content of struct user can be
555 * emulated. A 31 bit program peeking into the struct user of
556 * a 64 bit program is a no-no.
560 * Same as peek_user_per but for a 31 bit program.
562 static inline __u32 __peek_user_per_compat(struct task_struct *child,
565 struct compat_per_struct_kernel *dummy32 = NULL;
567 if (addr == (addr_t) &dummy32->cr9)
568 /* Control bits of the active per set. */
569 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
570 PER_EVENT_IFETCH : child->thread.per_user.control;
571 else if (addr == (addr_t) &dummy32->cr10)
572 /* Start address of the active per set. */
573 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
574 0 : child->thread.per_user.start;
575 else if (addr == (addr_t) &dummy32->cr11)
576 /* End address of the active per set. */
577 return test_thread_flag(TIF_SINGLE_STEP) ?
578 PSW32_ADDR_INSN : child->thread.per_user.end;
579 else if (addr == (addr_t) &dummy32->bits)
580 /* Single-step bit. */
581 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
583 else if (addr == (addr_t) &dummy32->starting_addr)
584 /* Start address of the user specified per set. */
585 return (__u32) child->thread.per_user.start;
586 else if (addr == (addr_t) &dummy32->ending_addr)
587 /* End address of the user specified per set. */
588 return (__u32) child->thread.per_user.end;
589 else if (addr == (addr_t) &dummy32->perc_atmid)
590 /* PER code, ATMID and AI of the last PER trap */
591 return (__u32) child->thread.per_event.cause << 16;
592 else if (addr == (addr_t) &dummy32->address)
593 /* Address of the last PER trap */
594 return (__u32) child->thread.per_event.address;
595 else if (addr == (addr_t) &dummy32->access_id)
596 /* Access id of the last PER trap */
597 return (__u32) child->thread.per_event.paid << 24;
602 * Same as peek_user but for a 31 bit program.
604 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
606 struct compat_user *dummy32 = NULL;
610 if (addr < (addr_t) &dummy32->regs.acrs) {
611 struct pt_regs *regs = task_pt_regs(child);
613 * psw and gprs are stored on the stack
615 if (addr == (addr_t) &dummy32->regs.psw.mask) {
616 /* Fake a 31 bit psw mask. */
617 tmp = (__u32)(regs->psw.mask >> 32);
618 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
619 tmp |= PSW32_USER_BITS;
620 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
621 /* Fake a 31 bit psw address. */
622 tmp = (__u32) regs->psw.addr |
623 (__u32)(regs->psw.mask & PSW_MASK_BA);
626 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
628 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
630 * access registers are stored in the thread structure
632 offset = addr - (addr_t) &dummy32->regs.acrs;
633 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
635 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
637 * orig_gpr2 is stored on the kernel stack
639 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
641 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
643 * prevent reads of padding hole between
644 * orig_gpr2 and fp_regs on s390.
648 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
650 * floating point control reg. is in the thread structure
652 tmp = child->thread.fpu.fpc;
654 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
656 * floating point regs. are either in child->thread.fpu
657 * or the child->thread.fpu.vxrs array
659 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
662 ((addr_t) child->thread.fpu.vxrs + 2*offset);
665 ((addr_t) child->thread.fpu.fprs + offset);
667 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
669 * Handle access to the per_info structure.
671 addr -= (addr_t) &dummy32->regs.per_info;
672 tmp = __peek_user_per_compat(child, addr);
680 static int peek_user_compat(struct task_struct *child,
681 addr_t addr, addr_t data)
685 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
688 tmp = __peek_user_compat(child, addr);
689 return put_user(tmp, (__u32 __user *) data);
693 * Same as poke_user_per but for a 31 bit program.
695 static inline void __poke_user_per_compat(struct task_struct *child,
696 addr_t addr, __u32 data)
698 struct compat_per_struct_kernel *dummy32 = NULL;
700 if (addr == (addr_t) &dummy32->cr9)
701 /* PER event mask of the user specified per set. */
702 child->thread.per_user.control =
703 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
704 else if (addr == (addr_t) &dummy32->starting_addr)
705 /* Starting address of the user specified per set. */
706 child->thread.per_user.start = data;
707 else if (addr == (addr_t) &dummy32->ending_addr)
708 /* Ending address of the user specified per set. */
709 child->thread.per_user.end = data;
713 * Same as poke_user but for a 31 bit program.
715 static int __poke_user_compat(struct task_struct *child,
716 addr_t addr, addr_t data)
718 struct compat_user *dummy32 = NULL;
719 __u32 tmp = (__u32) data;
722 if (addr < (addr_t) &dummy32->regs.acrs) {
723 struct pt_regs *regs = task_pt_regs(child);
725 * psw, gprs, acrs and orig_gpr2 are stored on the stack
727 if (addr == (addr_t) &dummy32->regs.psw.mask) {
728 __u32 mask = PSW32_MASK_USER;
730 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
731 /* Build a 64 bit psw mask from 31 bit mask. */
732 if ((tmp ^ PSW32_USER_BITS) & ~mask)
733 /* Invalid psw mask. */
735 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
736 /* Invalid address-space-control bits */
738 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
739 (regs->psw.mask & PSW_MASK_BA) |
740 (__u64)(tmp & mask) << 32;
741 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
742 /* Build a 64 bit psw address from 31 bit address. */
743 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
744 /* Transfer 31 bit amode bit to psw mask. */
745 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
746 (__u64)(tmp & PSW32_ADDR_AMODE);
749 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
750 addr == offsetof(struct compat_user, regs.gprs[2]))
751 fixup_int_code(child, data);
753 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
755 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
757 * access registers are stored in the thread structure
759 offset = addr - (addr_t) &dummy32->regs.acrs;
760 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
762 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
764 * orig_gpr2 is stored on the kernel stack
766 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
768 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
770 * prevent writess of padding hole between
771 * orig_gpr2 and fp_regs on s390.
775 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
777 * floating point control reg. is in the thread structure
779 if (test_fp_ctl(tmp))
781 child->thread.fpu.fpc = data;
783 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
785 * floating point regs. are either in child->thread.fpu
786 * or the child->thread.fpu.vxrs array
788 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
791 child->thread.fpu.vxrs + 2*offset) = tmp;
794 child->thread.fpu.fprs + offset) = tmp;
796 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
798 * Handle access to the per_info structure.
800 addr -= (addr_t) &dummy32->regs.per_info;
801 __poke_user_per_compat(child, addr, data);
807 static int poke_user_compat(struct task_struct *child,
808 addr_t addr, addr_t data)
810 if (!is_compat_task() || (addr & 3) ||
811 addr > sizeof(struct compat_user) - 3)
814 return __poke_user_compat(child, addr, data);
817 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
818 compat_ulong_t caddr, compat_ulong_t cdata)
820 unsigned long addr = caddr;
821 unsigned long data = cdata;
822 compat_ptrace_area parea;
827 /* read the word at location addr in the USER area. */
828 return peek_user_compat(child, addr, data);
831 /* write the word at location addr in the USER area */
832 return poke_user_compat(child, addr, data);
834 case PTRACE_PEEKUSR_AREA:
835 case PTRACE_POKEUSR_AREA:
836 if (copy_from_user(&parea, (void __force __user *) addr,
839 addr = parea.kernel_addr;
840 data = parea.process_addr;
842 while (copied < parea.len) {
843 if (request == PTRACE_PEEKUSR_AREA)
844 ret = peek_user_compat(child, addr, data);
848 (__u32 __force __user *) data))
850 ret = poke_user_compat(child, addr, utmp);
854 addr += sizeof(unsigned int);
855 data += sizeof(unsigned int);
856 copied += sizeof(unsigned int);
859 case PTRACE_GET_LAST_BREAK:
860 put_user(child->thread.last_break,
861 (unsigned int __user *) data);
864 return compat_ptrace_request(child, request, addr, data);
868 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
870 unsigned long mask = -1UL;
873 * The sysc_tracesys code in entry.S stored the system
874 * call number to gprs[2].
876 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
877 (tracehook_report_syscall_entry(regs) ||
878 regs->gprs[2] >= NR_syscalls)) {
880 * Tracing decided this syscall should not happen or the
881 * debugger stored an invalid system call number. Skip
882 * the system call and the system call restart handling.
884 clear_pt_regs_flag(regs, PIF_SYSCALL);
888 /* Do the secure computing check after ptrace. */
889 if (secure_computing(NULL)) {
890 /* seccomp failures shouldn't expose any additional code. */
894 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
895 trace_sys_enter(regs, regs->gprs[2]);
897 if (is_compat_task())
900 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask,
901 regs->gprs[3] &mask, regs->gprs[4] &mask,
902 regs->gprs[5] &mask);
904 return regs->gprs[2];
907 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
909 audit_syscall_exit(regs);
911 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
912 trace_sys_exit(regs, regs->gprs[2]);
914 if (test_thread_flag(TIF_SYSCALL_TRACE))
915 tracehook_report_syscall_exit(regs, 0);
919 * user_regset definitions.
922 static int s390_regs_get(struct task_struct *target,
923 const struct user_regset *regset,
924 unsigned int pos, unsigned int count,
925 void *kbuf, void __user *ubuf)
927 if (target == current)
928 save_access_regs(target->thread.acrs);
931 unsigned long *k = kbuf;
933 *k++ = __peek_user(target, pos);
938 unsigned long __user *u = ubuf;
940 if (__put_user(__peek_user(target, pos), u++))
949 static int s390_regs_set(struct task_struct *target,
950 const struct user_regset *regset,
951 unsigned int pos, unsigned int count,
952 const void *kbuf, const void __user *ubuf)
956 if (target == current)
957 save_access_regs(target->thread.acrs);
960 const unsigned long *k = kbuf;
961 while (count > 0 && !rc) {
962 rc = __poke_user(target, pos, *k++);
967 const unsigned long __user *u = ubuf;
968 while (count > 0 && !rc) {
970 rc = __get_user(word, u++);
973 rc = __poke_user(target, pos, word);
979 if (rc == 0 && target == current)
980 restore_access_regs(target->thread.acrs);
985 static int s390_fpregs_get(struct task_struct *target,
986 const struct user_regset *regset, unsigned int pos,
987 unsigned int count, void *kbuf, void __user *ubuf)
989 _s390_fp_regs fp_regs;
991 if (target == current)
994 fp_regs.fpc = target->thread.fpu.fpc;
995 fpregs_store(&fp_regs, &target->thread.fpu);
997 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1001 static int s390_fpregs_set(struct task_struct *target,
1002 const struct user_regset *regset, unsigned int pos,
1003 unsigned int count, const void *kbuf,
1004 const void __user *ubuf)
1007 freg_t fprs[__NUM_FPRS];
1009 if (target == current)
1013 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
1015 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
1017 /* If setting FPC, must validate it first. */
1018 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
1019 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
1020 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
1021 0, offsetof(s390_fp_regs, fprs));
1024 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
1026 target->thread.fpu.fpc = ufpc[0];
1029 if (rc == 0 && count > 0)
1030 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1031 fprs, offsetof(s390_fp_regs, fprs), -1);
1036 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
1038 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
1043 static int s390_last_break_get(struct task_struct *target,
1044 const struct user_regset *regset,
1045 unsigned int pos, unsigned int count,
1046 void *kbuf, void __user *ubuf)
1050 unsigned long *k = kbuf;
1051 *k = target->thread.last_break;
1053 unsigned long __user *u = ubuf;
1054 if (__put_user(target->thread.last_break, u))
1061 static int s390_last_break_set(struct task_struct *target,
1062 const struct user_regset *regset,
1063 unsigned int pos, unsigned int count,
1064 const void *kbuf, const void __user *ubuf)
1069 static int s390_tdb_get(struct task_struct *target,
1070 const struct user_regset *regset,
1071 unsigned int pos, unsigned int count,
1072 void *kbuf, void __user *ubuf)
1074 struct pt_regs *regs = task_pt_regs(target);
1075 unsigned char *data;
1077 if (!(regs->int_code & 0x200))
1079 data = target->thread.trap_tdb;
1080 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1083 static int s390_tdb_set(struct task_struct *target,
1084 const struct user_regset *regset,
1085 unsigned int pos, unsigned int count,
1086 const void *kbuf, const void __user *ubuf)
1091 static int s390_vxrs_low_get(struct task_struct *target,
1092 const struct user_regset *regset,
1093 unsigned int pos, unsigned int count,
1094 void *kbuf, void __user *ubuf)
1096 __u64 vxrs[__NUM_VXRS_LOW];
1099 if (!MACHINE_HAS_VX)
1101 if (target == current)
1103 for (i = 0; i < __NUM_VXRS_LOW; i++)
1104 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1105 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1108 static int s390_vxrs_low_set(struct task_struct *target,
1109 const struct user_regset *regset,
1110 unsigned int pos, unsigned int count,
1111 const void *kbuf, const void __user *ubuf)
1113 __u64 vxrs[__NUM_VXRS_LOW];
1116 if (!MACHINE_HAS_VX)
1118 if (target == current)
1121 for (i = 0; i < __NUM_VXRS_LOW; i++)
1122 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1124 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1126 for (i = 0; i < __NUM_VXRS_LOW; i++)
1127 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1132 static int s390_vxrs_high_get(struct task_struct *target,
1133 const struct user_regset *regset,
1134 unsigned int pos, unsigned int count,
1135 void *kbuf, void __user *ubuf)
1137 __vector128 vxrs[__NUM_VXRS_HIGH];
1139 if (!MACHINE_HAS_VX)
1141 if (target == current)
1143 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1145 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1148 static int s390_vxrs_high_set(struct task_struct *target,
1149 const struct user_regset *regset,
1150 unsigned int pos, unsigned int count,
1151 const void *kbuf, const void __user *ubuf)
1155 if (!MACHINE_HAS_VX)
1157 if (target == current)
1160 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1161 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1165 static int s390_system_call_get(struct task_struct *target,
1166 const struct user_regset *regset,
1167 unsigned int pos, unsigned int count,
1168 void *kbuf, void __user *ubuf)
1170 unsigned int *data = &target->thread.system_call;
1171 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1172 data, 0, sizeof(unsigned int));
1175 static int s390_system_call_set(struct task_struct *target,
1176 const struct user_regset *regset,
1177 unsigned int pos, unsigned int count,
1178 const void *kbuf, const void __user *ubuf)
1180 unsigned int *data = &target->thread.system_call;
1181 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1182 data, 0, sizeof(unsigned int));
1185 static int s390_gs_cb_get(struct task_struct *target,
1186 const struct user_regset *regset,
1187 unsigned int pos, unsigned int count,
1188 void *kbuf, void __user *ubuf)
1190 struct gs_cb *data = target->thread.gs_cb;
1192 if (!MACHINE_HAS_GS)
1196 if (target == current)
1198 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1199 data, 0, sizeof(struct gs_cb));
1202 static int s390_gs_cb_set(struct task_struct *target,
1203 const struct user_regset *regset,
1204 unsigned int pos, unsigned int count,
1205 const void *kbuf, const void __user *ubuf)
1207 struct gs_cb gs_cb = { }, *data = NULL;
1210 if (!MACHINE_HAS_GS)
1212 if (!target->thread.gs_cb) {
1213 data = kzalloc(sizeof(*data), GFP_KERNEL);
1217 if (!target->thread.gs_cb)
1219 else if (target == current)
1222 gs_cb = *target->thread.gs_cb;
1223 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1224 &gs_cb, 0, sizeof(gs_cb));
1230 if (!target->thread.gs_cb)
1231 target->thread.gs_cb = data;
1232 *target->thread.gs_cb = gs_cb;
1233 if (target == current) {
1234 __ctl_set_bit(2, 4);
1235 restore_gs_cb(target->thread.gs_cb);
1241 static int s390_gs_bc_get(struct task_struct *target,
1242 const struct user_regset *regset,
1243 unsigned int pos, unsigned int count,
1244 void *kbuf, void __user *ubuf)
1246 struct gs_cb *data = target->thread.gs_bc_cb;
1248 if (!MACHINE_HAS_GS)
1252 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1253 data, 0, sizeof(struct gs_cb));
1256 static int s390_gs_bc_set(struct task_struct *target,
1257 const struct user_regset *regset,
1258 unsigned int pos, unsigned int count,
1259 const void *kbuf, const void __user *ubuf)
1261 struct gs_cb *data = target->thread.gs_bc_cb;
1263 if (!MACHINE_HAS_GS)
1266 data = kzalloc(sizeof(*data), GFP_KERNEL);
1269 target->thread.gs_bc_cb = data;
1271 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1272 data, 0, sizeof(struct gs_cb));
1275 static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
1277 return (cb->rca & 0x1f) == 0 &&
1278 (cb->roa & 0xfff) == 0 &&
1279 (cb->rla & 0xfff) == 0xfff &&
1283 cb->reserved1 == 0 &&
1288 cb->reserved2 == 0 &&
1289 cb->reserved3 == 0 &&
1290 cb->reserved4 == 0 &&
1291 cb->reserved5 == 0 &&
1292 cb->reserved6 == 0 &&
1293 cb->reserved7 == 0 &&
1294 cb->reserved8 == 0 &&
1295 cb->rla >= cb->roa &&
1296 cb->rca >= cb->roa &&
1297 cb->rca <= cb->rla+1 &&
1301 static int s390_runtime_instr_get(struct task_struct *target,
1302 const struct user_regset *regset,
1303 unsigned int pos, unsigned int count,
1304 void *kbuf, void __user *ubuf)
1306 struct runtime_instr_cb *data = target->thread.ri_cb;
1308 if (!test_facility(64))
1313 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1314 data, 0, sizeof(struct runtime_instr_cb));
1317 static int s390_runtime_instr_set(struct task_struct *target,
1318 const struct user_regset *regset,
1319 unsigned int pos, unsigned int count,
1320 const void *kbuf, const void __user *ubuf)
1322 struct runtime_instr_cb ri_cb = { }, *data = NULL;
1325 if (!test_facility(64))
1328 if (!target->thread.ri_cb) {
1329 data = kzalloc(sizeof(*data), GFP_KERNEL);
1334 if (target->thread.ri_cb) {
1335 if (target == current)
1336 store_runtime_instr_cb(&ri_cb);
1338 ri_cb = *target->thread.ri_cb;
1341 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1342 &ri_cb, 0, sizeof(struct runtime_instr_cb));
1348 if (!is_ri_cb_valid(&ri_cb)) {
1353 * Override access key in any case, since user space should
1354 * not be able to set it, nor should it care about it.
1356 ri_cb.key = PAGE_DEFAULT_KEY >> 4;
1358 if (!target->thread.ri_cb)
1359 target->thread.ri_cb = data;
1360 *target->thread.ri_cb = ri_cb;
1361 if (target == current)
1362 load_runtime_instr_cb(target->thread.ri_cb);
1368 static const struct user_regset s390_regsets[] = {
1370 .core_note_type = NT_PRSTATUS,
1371 .n = sizeof(s390_regs) / sizeof(long),
1372 .size = sizeof(long),
1373 .align = sizeof(long),
1374 .get = s390_regs_get,
1375 .set = s390_regs_set,
1378 .core_note_type = NT_PRFPREG,
1379 .n = sizeof(s390_fp_regs) / sizeof(long),
1380 .size = sizeof(long),
1381 .align = sizeof(long),
1382 .get = s390_fpregs_get,
1383 .set = s390_fpregs_set,
1386 .core_note_type = NT_S390_SYSTEM_CALL,
1388 .size = sizeof(unsigned int),
1389 .align = sizeof(unsigned int),
1390 .get = s390_system_call_get,
1391 .set = s390_system_call_set,
1394 .core_note_type = NT_S390_LAST_BREAK,
1396 .size = sizeof(long),
1397 .align = sizeof(long),
1398 .get = s390_last_break_get,
1399 .set = s390_last_break_set,
1402 .core_note_type = NT_S390_TDB,
1406 .get = s390_tdb_get,
1407 .set = s390_tdb_set,
1410 .core_note_type = NT_S390_VXRS_LOW,
1411 .n = __NUM_VXRS_LOW,
1412 .size = sizeof(__u64),
1413 .align = sizeof(__u64),
1414 .get = s390_vxrs_low_get,
1415 .set = s390_vxrs_low_set,
1418 .core_note_type = NT_S390_VXRS_HIGH,
1419 .n = __NUM_VXRS_HIGH,
1420 .size = sizeof(__vector128),
1421 .align = sizeof(__vector128),
1422 .get = s390_vxrs_high_get,
1423 .set = s390_vxrs_high_set,
1426 .core_note_type = NT_S390_GS_CB,
1427 .n = sizeof(struct gs_cb) / sizeof(__u64),
1428 .size = sizeof(__u64),
1429 .align = sizeof(__u64),
1430 .get = s390_gs_cb_get,
1431 .set = s390_gs_cb_set,
1434 .core_note_type = NT_S390_GS_BC,
1435 .n = sizeof(struct gs_cb) / sizeof(__u64),
1436 .size = sizeof(__u64),
1437 .align = sizeof(__u64),
1438 .get = s390_gs_bc_get,
1439 .set = s390_gs_bc_set,
1442 .core_note_type = NT_S390_RI_CB,
1443 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1444 .size = sizeof(__u64),
1445 .align = sizeof(__u64),
1446 .get = s390_runtime_instr_get,
1447 .set = s390_runtime_instr_set,
1451 static const struct user_regset_view user_s390_view = {
1452 .name = UTS_MACHINE,
1453 .e_machine = EM_S390,
1454 .regsets = s390_regsets,
1455 .n = ARRAY_SIZE(s390_regsets)
1458 #ifdef CONFIG_COMPAT
1459 static int s390_compat_regs_get(struct task_struct *target,
1460 const struct user_regset *regset,
1461 unsigned int pos, unsigned int count,
1462 void *kbuf, void __user *ubuf)
1464 if (target == current)
1465 save_access_regs(target->thread.acrs);
1468 compat_ulong_t *k = kbuf;
1470 *k++ = __peek_user_compat(target, pos);
1471 count -= sizeof(*k);
1475 compat_ulong_t __user *u = ubuf;
1477 if (__put_user(__peek_user_compat(target, pos), u++))
1479 count -= sizeof(*u);
1486 static int s390_compat_regs_set(struct task_struct *target,
1487 const struct user_regset *regset,
1488 unsigned int pos, unsigned int count,
1489 const void *kbuf, const void __user *ubuf)
1493 if (target == current)
1494 save_access_regs(target->thread.acrs);
1497 const compat_ulong_t *k = kbuf;
1498 while (count > 0 && !rc) {
1499 rc = __poke_user_compat(target, pos, *k++);
1500 count -= sizeof(*k);
1504 const compat_ulong_t __user *u = ubuf;
1505 while (count > 0 && !rc) {
1506 compat_ulong_t word;
1507 rc = __get_user(word, u++);
1510 rc = __poke_user_compat(target, pos, word);
1511 count -= sizeof(*u);
1516 if (rc == 0 && target == current)
1517 restore_access_regs(target->thread.acrs);
1522 static int s390_compat_regs_high_get(struct task_struct *target,
1523 const struct user_regset *regset,
1524 unsigned int pos, unsigned int count,
1525 void *kbuf, void __user *ubuf)
1527 compat_ulong_t *gprs_high;
1529 gprs_high = (compat_ulong_t *)
1530 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1532 compat_ulong_t *k = kbuf;
1536 count -= sizeof(*k);
1539 compat_ulong_t __user *u = ubuf;
1541 if (__put_user(*gprs_high, u++))
1544 count -= sizeof(*u);
1550 static int s390_compat_regs_high_set(struct task_struct *target,
1551 const struct user_regset *regset,
1552 unsigned int pos, unsigned int count,
1553 const void *kbuf, const void __user *ubuf)
1555 compat_ulong_t *gprs_high;
1558 gprs_high = (compat_ulong_t *)
1559 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1561 const compat_ulong_t *k = kbuf;
1565 count -= sizeof(*k);
1568 const compat_ulong_t __user *u = ubuf;
1569 while (count > 0 && !rc) {
1571 rc = __get_user(word, u++);
1576 count -= sizeof(*u);
1583 static int s390_compat_last_break_get(struct task_struct *target,
1584 const struct user_regset *regset,
1585 unsigned int pos, unsigned int count,
1586 void *kbuf, void __user *ubuf)
1588 compat_ulong_t last_break;
1591 last_break = target->thread.last_break;
1593 unsigned long *k = kbuf;
1596 unsigned long __user *u = ubuf;
1597 if (__put_user(last_break, u))
1604 static int s390_compat_last_break_set(struct task_struct *target,
1605 const struct user_regset *regset,
1606 unsigned int pos, unsigned int count,
1607 const void *kbuf, const void __user *ubuf)
1612 static const struct user_regset s390_compat_regsets[] = {
1614 .core_note_type = NT_PRSTATUS,
1615 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1616 .size = sizeof(compat_long_t),
1617 .align = sizeof(compat_long_t),
1618 .get = s390_compat_regs_get,
1619 .set = s390_compat_regs_set,
1622 .core_note_type = NT_PRFPREG,
1623 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1624 .size = sizeof(compat_long_t),
1625 .align = sizeof(compat_long_t),
1626 .get = s390_fpregs_get,
1627 .set = s390_fpregs_set,
1630 .core_note_type = NT_S390_SYSTEM_CALL,
1632 .size = sizeof(compat_uint_t),
1633 .align = sizeof(compat_uint_t),
1634 .get = s390_system_call_get,
1635 .set = s390_system_call_set,
1638 .core_note_type = NT_S390_LAST_BREAK,
1640 .size = sizeof(long),
1641 .align = sizeof(long),
1642 .get = s390_compat_last_break_get,
1643 .set = s390_compat_last_break_set,
1646 .core_note_type = NT_S390_TDB,
1650 .get = s390_tdb_get,
1651 .set = s390_tdb_set,
1654 .core_note_type = NT_S390_VXRS_LOW,
1655 .n = __NUM_VXRS_LOW,
1656 .size = sizeof(__u64),
1657 .align = sizeof(__u64),
1658 .get = s390_vxrs_low_get,
1659 .set = s390_vxrs_low_set,
1662 .core_note_type = NT_S390_VXRS_HIGH,
1663 .n = __NUM_VXRS_HIGH,
1664 .size = sizeof(__vector128),
1665 .align = sizeof(__vector128),
1666 .get = s390_vxrs_high_get,
1667 .set = s390_vxrs_high_set,
1670 .core_note_type = NT_S390_HIGH_GPRS,
1671 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1672 .size = sizeof(compat_long_t),
1673 .align = sizeof(compat_long_t),
1674 .get = s390_compat_regs_high_get,
1675 .set = s390_compat_regs_high_set,
1678 .core_note_type = NT_S390_GS_CB,
1679 .n = sizeof(struct gs_cb) / sizeof(__u64),
1680 .size = sizeof(__u64),
1681 .align = sizeof(__u64),
1682 .get = s390_gs_cb_get,
1683 .set = s390_gs_cb_set,
1686 .core_note_type = NT_S390_GS_BC,
1687 .n = sizeof(struct gs_cb) / sizeof(__u64),
1688 .size = sizeof(__u64),
1689 .align = sizeof(__u64),
1690 .get = s390_gs_bc_get,
1691 .set = s390_gs_bc_set,
1694 .core_note_type = NT_S390_RI_CB,
1695 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1696 .size = sizeof(__u64),
1697 .align = sizeof(__u64),
1698 .get = s390_runtime_instr_get,
1699 .set = s390_runtime_instr_set,
1703 static const struct user_regset_view user_s390_compat_view = {
1705 .e_machine = EM_S390,
1706 .regsets = s390_compat_regsets,
1707 .n = ARRAY_SIZE(s390_compat_regsets)
1711 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1713 #ifdef CONFIG_COMPAT
1714 if (test_tsk_thread_flag(task, TIF_31BIT))
1715 return &user_s390_compat_view;
1717 return &user_s390_view;
1720 static const char *gpr_names[NUM_GPRS] = {
1721 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1722 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1725 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1727 if (offset >= NUM_GPRS)
1729 return regs->gprs[offset];
1732 int regs_query_register_offset(const char *name)
1734 unsigned long offset;
1736 if (!name || *name != 'r')
1738 if (kstrtoul(name + 1, 10, &offset))
1740 if (offset >= NUM_GPRS)
1745 const char *regs_query_register_name(unsigned int offset)
1747 if (offset >= NUM_GPRS)
1749 return gpr_names[offset];
1752 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1754 unsigned long ksp = kernel_stack_pointer(regs);
1756 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1760 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1761 * @regs:pt_regs which contains kernel stack pointer.
1762 * @n:stack entry number.
1764 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1765 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1768 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1772 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1773 if (!regs_within_kernel_stack(regs, addr))
1775 return *(unsigned long *)addr;