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 "asm/ptrace.h"
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/sched/task_stack.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>
28 #include <linux/uaccess.h>
29 #include <asm/unistd.h>
30 #include <asm/switch_to.h>
31 #include <asm/runtime_instr.h>
32 #include <asm/facility.h>
37 #include "compat_ptrace.h"
40 void update_cr_regs(struct task_struct *task)
42 struct pt_regs *regs = task_pt_regs(task);
43 struct thread_struct *thread = &task->thread;
44 struct per_regs old, new;
45 union ctlreg0 cr0_old, cr0_new;
46 union ctlreg2 cr2_old, cr2_new;
47 int cr0_changed, cr2_changed;
49 __ctl_store(cr0_old.val, 0, 0);
50 __ctl_store(cr2_old.val, 2, 2);
53 /* Take care of the enable/disable of transactional execution. */
55 /* Set or clear transaction execution TXC bit 8. */
57 if (task->thread.per_flags & PER_FLAG_NO_TE)
59 /* Set or clear transaction execution TDC bits 62 and 63. */
61 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
62 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
68 /* Take care of enable/disable of guarded storage. */
71 if (task->thread.gs_cb)
74 /* Load control register 0/2 iff changed */
75 cr0_changed = cr0_new.val != cr0_old.val;
76 cr2_changed = cr2_new.val != cr2_old.val;
78 __ctl_load(cr0_new.val, 0, 0);
80 __ctl_load(cr2_new.val, 2, 2);
81 /* Copy user specified PER registers */
82 new.control = thread->per_user.control;
83 new.start = thread->per_user.start;
84 new.end = thread->per_user.end;
86 /* merge TIF_SINGLE_STEP into user specified PER registers. */
87 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
88 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
89 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
90 new.control |= PER_EVENT_BRANCH;
92 new.control |= PER_EVENT_IFETCH;
93 new.control |= PER_CONTROL_SUSPENSION;
94 new.control |= PER_EVENT_TRANSACTION_END;
95 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
96 new.control |= PER_EVENT_IFETCH;
101 /* Take care of the PER enablement bit in the PSW. */
102 if (!(new.control & PER_EVENT_MASK)) {
103 regs->psw.mask &= ~PSW_MASK_PER;
106 regs->psw.mask |= PSW_MASK_PER;
107 __ctl_store(old, 9, 11);
108 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
109 __ctl_load(new, 9, 11);
112 void user_enable_single_step(struct task_struct *task)
114 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
115 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
118 void user_disable_single_step(struct task_struct *task)
120 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
121 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
124 void user_enable_block_step(struct task_struct *task)
126 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
127 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
131 * Called by kernel/ptrace.c when detaching..
133 * Clear all debugging related fields.
135 void ptrace_disable(struct task_struct *task)
137 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
138 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
139 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
140 clear_tsk_thread_flag(task, TIF_PER_TRAP);
141 task->thread.per_flags = 0;
144 #define __ADDR_MASK 7
146 static inline unsigned long __peek_user_per(struct task_struct *child,
149 if (addr == offsetof(struct per_struct_kernel, cr9))
150 /* Control bits of the active per set. */
151 return test_thread_flag(TIF_SINGLE_STEP) ?
152 PER_EVENT_IFETCH : child->thread.per_user.control;
153 else if (addr == offsetof(struct per_struct_kernel, cr10))
154 /* Start address of the active per set. */
155 return test_thread_flag(TIF_SINGLE_STEP) ?
156 0 : child->thread.per_user.start;
157 else if (addr == offsetof(struct per_struct_kernel, cr11))
158 /* End address of the active per set. */
159 return test_thread_flag(TIF_SINGLE_STEP) ?
160 -1UL : child->thread.per_user.end;
161 else if (addr == offsetof(struct per_struct_kernel, bits))
162 /* Single-step bit. */
163 return test_thread_flag(TIF_SINGLE_STEP) ?
164 (1UL << (BITS_PER_LONG - 1)) : 0;
165 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
166 /* Start address of the user specified per set. */
167 return child->thread.per_user.start;
168 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
169 /* End address of the user specified per set. */
170 return child->thread.per_user.end;
171 else if (addr == offsetof(struct per_struct_kernel, perc_atmid))
172 /* PER code, ATMID and AI of the last PER trap */
173 return (unsigned long)
174 child->thread.per_event.cause << (BITS_PER_LONG - 16);
175 else if (addr == offsetof(struct per_struct_kernel, address))
176 /* Address of the last PER trap */
177 return child->thread.per_event.address;
178 else if (addr == offsetof(struct per_struct_kernel, access_id))
179 /* Access id of the last PER trap */
180 return (unsigned long)
181 child->thread.per_event.paid << (BITS_PER_LONG - 8);
186 * Read the word at offset addr from the user area of a process. The
187 * trouble here is that the information is littered over different
188 * locations. The process registers are found on the kernel stack,
189 * the floating point stuff and the trace settings are stored in
190 * the task structure. In addition the different structures in
191 * struct user contain pad bytes that should be read as zeroes.
194 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
198 if (addr < offsetof(struct user, regs.acrs)) {
200 * psw and gprs are stored on the stack
202 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
203 if (addr == offsetof(struct user, regs.psw.mask)) {
204 /* Return a clean psw mask. */
205 tmp &= PSW_MASK_USER | PSW_MASK_RI;
206 tmp |= PSW_USER_BITS;
209 } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
211 * access registers are stored in the thread structure
213 offset = addr - offsetof(struct user, regs.acrs);
215 * Very special case: old & broken 64 bit gdb reading
216 * from acrs[15]. Result is a 64 bit value. Read the
217 * 32 bit acrs[15] value and shift it by 32. Sick...
219 if (addr == offsetof(struct user, regs.acrs[15]))
220 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
222 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
224 } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
226 * orig_gpr2 is stored on the kernel stack
228 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
230 } else if (addr < offsetof(struct user, regs.fp_regs)) {
232 * prevent reads of padding hole between
233 * orig_gpr2 and fp_regs on s390.
237 } else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
239 * floating point control reg. is in the thread structure
241 tmp = child->thread.fpu.fpc;
242 tmp <<= BITS_PER_LONG - 32;
244 } else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
246 * floating point regs. are either in child->thread.fpu
247 * or the child->thread.fpu.vxrs array
249 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
252 ((addr_t) child->thread.fpu.vxrs + 2*offset);
255 ((addr_t) child->thread.fpu.fprs + offset);
257 } else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
259 * Handle access to the per_info structure.
261 addr -= offsetof(struct user, regs.per_info);
262 tmp = __peek_user_per(child, addr);
271 peek_user(struct task_struct *child, addr_t addr, addr_t data)
276 * Stupid gdb peeks/pokes the access registers in 64 bit with
277 * an alignment of 4. Programmers from hell...
280 if (addr >= offsetof(struct user, regs.acrs) &&
281 addr < offsetof(struct user, regs.orig_gpr2))
283 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
286 tmp = __peek_user(child, addr);
287 return put_user(tmp, (addr_t __user *) data);
290 static inline void __poke_user_per(struct task_struct *child,
291 addr_t addr, addr_t data)
294 * There are only three fields in the per_info struct that the
295 * debugger user can write to.
296 * 1) cr9: the debugger wants to set a new PER event mask
297 * 2) starting_addr: the debugger wants to set a new starting
298 * address to use with the PER event mask.
299 * 3) ending_addr: the debugger wants to set a new ending
300 * address to use with the PER event mask.
301 * The user specified PER event mask and the start and end
302 * addresses are used only if single stepping is not in effect.
303 * Writes to any other field in per_info are ignored.
305 if (addr == offsetof(struct per_struct_kernel, cr9))
306 /* PER event mask of the user specified per set. */
307 child->thread.per_user.control =
308 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
309 else if (addr == offsetof(struct per_struct_kernel, starting_addr))
310 /* Starting address of the user specified per set. */
311 child->thread.per_user.start = data;
312 else if (addr == offsetof(struct per_struct_kernel, ending_addr))
313 /* Ending address of the user specified per set. */
314 child->thread.per_user.end = data;
318 * Write a word to the user area of a process at location addr. This
319 * operation does have an additional problem compared to peek_user.
320 * Stores to the program status word and on the floating point
321 * control register needs to get checked for validity.
323 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
328 if (addr < offsetof(struct user, regs.acrs)) {
329 struct pt_regs *regs = task_pt_regs(child);
331 * psw and gprs are stored on the stack
333 if (addr == offsetof(struct user, regs.psw.mask)) {
334 unsigned long mask = PSW_MASK_USER;
336 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
337 if ((data ^ PSW_USER_BITS) & ~mask)
338 /* Invalid psw mask. */
340 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
341 /* Invalid address-space-control bits */
343 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
344 /* Invalid addressing mode bits */
348 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
349 addr == offsetof(struct user, regs.gprs[2])) {
350 struct pt_regs *regs = task_pt_regs(child);
352 regs->int_code = 0x20000 | (data & 0xffff);
354 *(addr_t *)((addr_t) ®s->psw + addr) = data;
355 } else if (addr < offsetof(struct user, regs.orig_gpr2)) {
357 * access registers are stored in the thread structure
359 offset = addr - offsetof(struct user, regs.acrs);
361 * Very special case: old & broken 64 bit gdb writing
362 * to acrs[15] with a 64 bit value. Ignore the lower
363 * half of the value and write the upper 32 bit to
366 if (addr == offsetof(struct user, regs.acrs[15]))
367 child->thread.acrs[15] = (unsigned int) (data >> 32);
369 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
371 } else if (addr == offsetof(struct user, regs.orig_gpr2)) {
373 * orig_gpr2 is stored on the kernel stack
375 task_pt_regs(child)->orig_gpr2 = data;
377 } else if (addr < offsetof(struct user, regs.fp_regs)) {
379 * prevent writes of padding hole between
380 * orig_gpr2 and fp_regs on s390.
384 } else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
386 * floating point control reg. is in the thread structure
388 if ((unsigned int) data != 0 ||
389 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
391 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
393 } else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
395 * floating point regs. are either in child->thread.fpu
396 * or the child->thread.fpu.vxrs array
398 offset = addr - offsetof(struct user, regs.fp_regs.fprs);
401 child->thread.fpu.vxrs + 2*offset) = data;
404 child->thread.fpu.fprs + offset) = data;
406 } else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
408 * Handle access to the per_info structure.
410 addr -= offsetof(struct user, regs.per_info);
411 __poke_user_per(child, addr, data);
418 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
423 * Stupid gdb peeks/pokes the access registers in 64 bit with
424 * an alignment of 4. Programmers from hell indeed...
427 if (addr >= offsetof(struct user, regs.acrs) &&
428 addr < offsetof(struct user, regs.orig_gpr2))
430 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
433 return __poke_user(child, addr, data);
436 long arch_ptrace(struct task_struct *child, long request,
437 unsigned long addr, unsigned long data)
444 /* read the word at location addr in the USER area. */
445 return peek_user(child, addr, data);
448 /* write the word at location addr in the USER area */
449 return poke_user(child, addr, data);
451 case PTRACE_PEEKUSR_AREA:
452 case PTRACE_POKEUSR_AREA:
453 if (copy_from_user(&parea, (void __force __user *) addr,
456 addr = parea.kernel_addr;
457 data = parea.process_addr;
459 while (copied < parea.len) {
460 if (request == PTRACE_PEEKUSR_AREA)
461 ret = peek_user(child, addr, data);
465 (addr_t __force __user *) data))
467 ret = poke_user(child, addr, utmp);
471 addr += sizeof(unsigned long);
472 data += sizeof(unsigned long);
473 copied += sizeof(unsigned long);
476 case PTRACE_GET_LAST_BREAK:
477 return put_user(child->thread.last_break, (unsigned long __user *)data);
478 case PTRACE_ENABLE_TE:
481 child->thread.per_flags &= ~PER_FLAG_NO_TE;
483 case PTRACE_DISABLE_TE:
486 child->thread.per_flags |= PER_FLAG_NO_TE;
487 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
489 case PTRACE_TE_ABORT_RAND:
490 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
494 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
497 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
498 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
501 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
502 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
509 return ptrace_request(child, request, addr, data);
515 * Now the fun part starts... a 31 bit program running in the
516 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
517 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
518 * to handle, the difference to the 64 bit versions of the requests
519 * is that the access is done in multiples of 4 byte instead of
520 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
521 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
522 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
523 * is a 31 bit program too, the content of struct user can be
524 * emulated. A 31 bit program peeking into the struct user of
525 * a 64 bit program is a no-no.
529 * Same as peek_user_per but for a 31 bit program.
531 static inline __u32 __peek_user_per_compat(struct task_struct *child,
534 if (addr == offsetof(struct compat_per_struct_kernel, cr9))
535 /* Control bits of the active per set. */
536 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
537 PER_EVENT_IFETCH : child->thread.per_user.control;
538 else if (addr == offsetof(struct compat_per_struct_kernel, cr10))
539 /* Start address of the active per set. */
540 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
541 0 : child->thread.per_user.start;
542 else if (addr == offsetof(struct compat_per_struct_kernel, cr11))
543 /* End address of the active per set. */
544 return test_thread_flag(TIF_SINGLE_STEP) ?
545 PSW32_ADDR_INSN : child->thread.per_user.end;
546 else if (addr == offsetof(struct compat_per_struct_kernel, bits))
547 /* Single-step bit. */
548 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
550 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
551 /* Start address of the user specified per set. */
552 return (__u32) child->thread.per_user.start;
553 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
554 /* End address of the user specified per set. */
555 return (__u32) child->thread.per_user.end;
556 else if (addr == offsetof(struct compat_per_struct_kernel, perc_atmid))
557 /* PER code, ATMID and AI of the last PER trap */
558 return (__u32) child->thread.per_event.cause << 16;
559 else if (addr == offsetof(struct compat_per_struct_kernel, address))
560 /* Address of the last PER trap */
561 return (__u32) child->thread.per_event.address;
562 else if (addr == offsetof(struct compat_per_struct_kernel, access_id))
563 /* Access id of the last PER trap */
564 return (__u32) child->thread.per_event.paid << 24;
569 * Same as peek_user but for a 31 bit program.
571 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
576 if (addr < offsetof(struct compat_user, regs.acrs)) {
577 struct pt_regs *regs = task_pt_regs(child);
579 * psw and gprs are stored on the stack
581 if (addr == offsetof(struct compat_user, 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 == offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.orig_gpr2)) {
596 * access registers are stored in the thread structure
598 offset = addr - offsetof(struct compat_user, regs.acrs);
599 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
601 } else if (addr == offsetof(struct compat_user, 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 < offsetof(struct compat_user, regs.fp_regs)) {
609 * prevent reads of padding hole between
610 * orig_gpr2 and fp_regs on s390.
614 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
616 * floating point control reg. is in the thread structure
618 tmp = child->thread.fpu.fpc;
620 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
622 * floating point regs. are either in child->thread.fpu
623 * or the child->thread.fpu.vxrs array
625 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
628 ((addr_t) child->thread.fpu.vxrs + 2*offset);
631 ((addr_t) child->thread.fpu.fprs + offset);
633 } else if (addr < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
635 * Handle access to the per_info structure.
637 addr -= offsetof(struct compat_user, regs.per_info);
638 tmp = __peek_user_per_compat(child, addr);
646 static int peek_user_compat(struct task_struct *child,
647 addr_t addr, addr_t data)
651 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
654 tmp = __peek_user_compat(child, addr);
655 return put_user(tmp, (__u32 __user *) data);
659 * Same as poke_user_per but for a 31 bit program.
661 static inline void __poke_user_per_compat(struct task_struct *child,
662 addr_t addr, __u32 data)
664 if (addr == offsetof(struct compat_per_struct_kernel, cr9))
665 /* PER event mask of the user specified per set. */
666 child->thread.per_user.control =
667 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
668 else if (addr == offsetof(struct compat_per_struct_kernel, starting_addr))
669 /* Starting address of the user specified per set. */
670 child->thread.per_user.start = data;
671 else if (addr == offsetof(struct compat_per_struct_kernel, ending_addr))
672 /* Ending address of the user specified per set. */
673 child->thread.per_user.end = data;
677 * Same as poke_user but for a 31 bit program.
679 static int __poke_user_compat(struct task_struct *child,
680 addr_t addr, addr_t data)
682 __u32 tmp = (__u32) data;
685 if (addr < offsetof(struct compat_user, regs.acrs)) {
686 struct pt_regs *regs = task_pt_regs(child);
688 * psw, gprs, acrs and orig_gpr2 are stored on the stack
690 if (addr == offsetof(struct compat_user, regs.psw.mask)) {
691 __u32 mask = PSW32_MASK_USER;
693 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
694 /* Build a 64 bit psw mask from 31 bit mask. */
695 if ((tmp ^ PSW32_USER_BITS) & ~mask)
696 /* Invalid psw mask. */
698 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
699 /* Invalid address-space-control bits */
701 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
702 (regs->psw.mask & PSW_MASK_BA) |
703 (__u64)(tmp & mask) << 32;
704 } else if (addr == offsetof(struct compat_user, regs.psw.addr)) {
705 /* Build a 64 bit psw address from 31 bit address. */
706 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
707 /* Transfer 31 bit amode bit to psw mask. */
708 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
709 (__u64)(tmp & PSW32_ADDR_AMODE);
711 if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
712 addr == offsetof(struct compat_user, regs.gprs[2])) {
713 struct pt_regs *regs = task_pt_regs(child);
715 regs->int_code = 0x20000 | (data & 0xffff);
718 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
720 } else if (addr < offsetof(struct compat_user, regs.orig_gpr2)) {
722 * access registers are stored in the thread structure
724 offset = addr - offsetof(struct compat_user, regs.acrs);
725 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
727 } else if (addr == offsetof(struct compat_user, regs.orig_gpr2)) {
729 * orig_gpr2 is stored on the kernel stack
731 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
733 } else if (addr < offsetof(struct compat_user, regs.fp_regs)) {
735 * prevent writess of padding hole between
736 * orig_gpr2 and fp_regs on s390.
740 } else if (addr == offsetof(struct compat_user, regs.fp_regs.fpc)) {
742 * floating point control reg. is in the thread structure
744 if (test_fp_ctl(tmp))
746 child->thread.fpu.fpc = data;
748 } else if (addr < offsetof(struct compat_user, regs.fp_regs) + sizeof(s390_fp_regs)) {
750 * floating point regs. are either in child->thread.fpu
751 * or the child->thread.fpu.vxrs array
753 offset = addr - offsetof(struct compat_user, regs.fp_regs.fprs);
756 child->thread.fpu.vxrs + 2*offset) = tmp;
759 child->thread.fpu.fprs + offset) = tmp;
761 } else if (addr < offsetof(struct compat_user, regs.per_info) + sizeof(struct compat_per_struct_kernel)) {
763 * Handle access to the per_info structure.
765 addr -= offsetof(struct compat_user, regs.per_info);
766 __poke_user_per_compat(child, addr, data);
772 static int poke_user_compat(struct task_struct *child,
773 addr_t addr, addr_t data)
775 if (!is_compat_task() || (addr & 3) ||
776 addr > sizeof(struct compat_user) - 3)
779 return __poke_user_compat(child, addr, data);
782 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
783 compat_ulong_t caddr, compat_ulong_t cdata)
785 unsigned long addr = caddr;
786 unsigned long data = cdata;
787 compat_ptrace_area parea;
792 /* read the word at location addr in the USER area. */
793 return peek_user_compat(child, addr, data);
796 /* write the word at location addr in the USER area */
797 return poke_user_compat(child, addr, data);
799 case PTRACE_PEEKUSR_AREA:
800 case PTRACE_POKEUSR_AREA:
801 if (copy_from_user(&parea, (void __force __user *) addr,
804 addr = parea.kernel_addr;
805 data = parea.process_addr;
807 while (copied < parea.len) {
808 if (request == PTRACE_PEEKUSR_AREA)
809 ret = peek_user_compat(child, addr, data);
813 (__u32 __force __user *) data))
815 ret = poke_user_compat(child, addr, utmp);
819 addr += sizeof(unsigned int);
820 data += sizeof(unsigned int);
821 copied += sizeof(unsigned int);
824 case PTRACE_GET_LAST_BREAK:
825 return put_user(child->thread.last_break, (unsigned int __user *)data);
827 return compat_ptrace_request(child, request, addr, data);
832 * user_regset definitions.
835 static int s390_regs_get(struct task_struct *target,
836 const struct user_regset *regset,
840 if (target == current)
841 save_access_regs(target->thread.acrs);
843 for (pos = 0; pos < sizeof(s390_regs); pos += sizeof(long))
844 membuf_store(&to, __peek_user(target, pos));
848 static int s390_regs_set(struct task_struct *target,
849 const struct user_regset *regset,
850 unsigned int pos, unsigned int count,
851 const void *kbuf, const void __user *ubuf)
855 if (target == current)
856 save_access_regs(target->thread.acrs);
859 const unsigned long *k = kbuf;
860 while (count > 0 && !rc) {
861 rc = __poke_user(target, pos, *k++);
866 const unsigned long __user *u = ubuf;
867 while (count > 0 && !rc) {
869 rc = __get_user(word, u++);
872 rc = __poke_user(target, pos, word);
878 if (rc == 0 && target == current)
879 restore_access_regs(target->thread.acrs);
884 static int s390_fpregs_get(struct task_struct *target,
885 const struct user_regset *regset,
888 _s390_fp_regs fp_regs;
890 if (target == current)
893 fp_regs.fpc = target->thread.fpu.fpc;
894 fpregs_store(&fp_regs, &target->thread.fpu);
896 return membuf_write(&to, &fp_regs, sizeof(fp_regs));
899 static int s390_fpregs_set(struct task_struct *target,
900 const struct user_regset *regset, unsigned int pos,
901 unsigned int count, const void *kbuf,
902 const void __user *ubuf)
905 freg_t fprs[__NUM_FPRS];
907 if (target == current)
911 convert_vx_to_fp(fprs, target->thread.fpu.vxrs);
913 memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs));
915 /* If setting FPC, must validate it first. */
916 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
917 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
918 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
919 0, offsetof(s390_fp_regs, fprs));
922 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
924 target->thread.fpu.fpc = ufpc[0];
927 if (rc == 0 && count > 0)
928 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
929 fprs, offsetof(s390_fp_regs, fprs), -1);
934 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
936 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
941 static int s390_last_break_get(struct task_struct *target,
942 const struct user_regset *regset,
945 return membuf_store(&to, target->thread.last_break);
948 static int s390_last_break_set(struct task_struct *target,
949 const struct user_regset *regset,
950 unsigned int pos, unsigned int count,
951 const void *kbuf, const void __user *ubuf)
956 static int s390_tdb_get(struct task_struct *target,
957 const struct user_regset *regset,
960 struct pt_regs *regs = task_pt_regs(target);
963 if (!(regs->int_code & 0x200))
965 size = sizeof(target->thread.trap_tdb.data);
966 return membuf_write(&to, target->thread.trap_tdb.data, size);
969 static int s390_tdb_set(struct task_struct *target,
970 const struct user_regset *regset,
971 unsigned int pos, unsigned int count,
972 const void *kbuf, const void __user *ubuf)
977 static int s390_vxrs_low_get(struct task_struct *target,
978 const struct user_regset *regset,
981 __u64 vxrs[__NUM_VXRS_LOW];
986 if (target == current)
988 for (i = 0; i < __NUM_VXRS_LOW; i++)
989 vxrs[i] = target->thread.fpu.vxrs[i].low;
990 return membuf_write(&to, vxrs, sizeof(vxrs));
993 static int s390_vxrs_low_set(struct task_struct *target,
994 const struct user_regset *regset,
995 unsigned int pos, unsigned int count,
996 const void *kbuf, const void __user *ubuf)
998 __u64 vxrs[__NUM_VXRS_LOW];
1001 if (!MACHINE_HAS_VX)
1003 if (target == current)
1006 for (i = 0; i < __NUM_VXRS_LOW; i++)
1007 vxrs[i] = target->thread.fpu.vxrs[i].low;
1009 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1011 for (i = 0; i < __NUM_VXRS_LOW; i++)
1012 target->thread.fpu.vxrs[i].low = vxrs[i];
1017 static int s390_vxrs_high_get(struct task_struct *target,
1018 const struct user_regset *regset,
1021 if (!MACHINE_HAS_VX)
1023 if (target == current)
1025 return membuf_write(&to, target->thread.fpu.vxrs + __NUM_VXRS_LOW,
1026 __NUM_VXRS_HIGH * sizeof(__vector128));
1029 static int s390_vxrs_high_set(struct task_struct *target,
1030 const struct user_regset *regset,
1031 unsigned int pos, unsigned int count,
1032 const void *kbuf, const void __user *ubuf)
1036 if (!MACHINE_HAS_VX)
1038 if (target == current)
1041 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1042 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1046 static int s390_system_call_get(struct task_struct *target,
1047 const struct user_regset *regset,
1050 return membuf_store(&to, target->thread.system_call);
1053 static int s390_system_call_set(struct task_struct *target,
1054 const struct user_regset *regset,
1055 unsigned int pos, unsigned int count,
1056 const void *kbuf, const void __user *ubuf)
1058 unsigned int *data = &target->thread.system_call;
1059 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1060 data, 0, sizeof(unsigned int));
1063 static int s390_gs_cb_get(struct task_struct *target,
1064 const struct user_regset *regset,
1067 struct gs_cb *data = target->thread.gs_cb;
1069 if (!MACHINE_HAS_GS)
1073 if (target == current)
1075 return membuf_write(&to, data, sizeof(struct gs_cb));
1078 static int s390_gs_cb_set(struct task_struct *target,
1079 const struct user_regset *regset,
1080 unsigned int pos, unsigned int count,
1081 const void *kbuf, const void __user *ubuf)
1083 struct gs_cb gs_cb = { }, *data = NULL;
1086 if (!MACHINE_HAS_GS)
1088 if (!target->thread.gs_cb) {
1089 data = kzalloc(sizeof(*data), GFP_KERNEL);
1093 if (!target->thread.gs_cb)
1095 else if (target == current)
1098 gs_cb = *target->thread.gs_cb;
1099 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1100 &gs_cb, 0, sizeof(gs_cb));
1106 if (!target->thread.gs_cb)
1107 target->thread.gs_cb = data;
1108 *target->thread.gs_cb = gs_cb;
1109 if (target == current) {
1110 __ctl_set_bit(2, 4);
1111 restore_gs_cb(target->thread.gs_cb);
1117 static int s390_gs_bc_get(struct task_struct *target,
1118 const struct user_regset *regset,
1121 struct gs_cb *data = target->thread.gs_bc_cb;
1123 if (!MACHINE_HAS_GS)
1127 return membuf_write(&to, data, sizeof(struct gs_cb));
1130 static int s390_gs_bc_set(struct task_struct *target,
1131 const struct user_regset *regset,
1132 unsigned int pos, unsigned int count,
1133 const void *kbuf, const void __user *ubuf)
1135 struct gs_cb *data = target->thread.gs_bc_cb;
1137 if (!MACHINE_HAS_GS)
1140 data = kzalloc(sizeof(*data), GFP_KERNEL);
1143 target->thread.gs_bc_cb = data;
1145 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1146 data, 0, sizeof(struct gs_cb));
1149 static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
1151 return (cb->rca & 0x1f) == 0 &&
1152 (cb->roa & 0xfff) == 0 &&
1153 (cb->rla & 0xfff) == 0xfff &&
1157 cb->reserved1 == 0 &&
1162 cb->reserved2 == 0 &&
1163 cb->reserved3 == 0 &&
1164 cb->reserved4 == 0 &&
1165 cb->reserved5 == 0 &&
1166 cb->reserved6 == 0 &&
1167 cb->reserved7 == 0 &&
1168 cb->reserved8 == 0 &&
1169 cb->rla >= cb->roa &&
1170 cb->rca >= cb->roa &&
1171 cb->rca <= cb->rla+1 &&
1175 static int s390_runtime_instr_get(struct task_struct *target,
1176 const struct user_regset *regset,
1179 struct runtime_instr_cb *data = target->thread.ri_cb;
1181 if (!test_facility(64))
1186 return membuf_write(&to, data, sizeof(struct runtime_instr_cb));
1189 static int s390_runtime_instr_set(struct task_struct *target,
1190 const struct user_regset *regset,
1191 unsigned int pos, unsigned int count,
1192 const void *kbuf, const void __user *ubuf)
1194 struct runtime_instr_cb ri_cb = { }, *data = NULL;
1197 if (!test_facility(64))
1200 if (!target->thread.ri_cb) {
1201 data = kzalloc(sizeof(*data), GFP_KERNEL);
1206 if (target->thread.ri_cb) {
1207 if (target == current)
1208 store_runtime_instr_cb(&ri_cb);
1210 ri_cb = *target->thread.ri_cb;
1213 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1214 &ri_cb, 0, sizeof(struct runtime_instr_cb));
1220 if (!is_ri_cb_valid(&ri_cb)) {
1225 * Override access key in any case, since user space should
1226 * not be able to set it, nor should it care about it.
1228 ri_cb.key = PAGE_DEFAULT_KEY >> 4;
1230 if (!target->thread.ri_cb)
1231 target->thread.ri_cb = data;
1232 *target->thread.ri_cb = ri_cb;
1233 if (target == current)
1234 load_runtime_instr_cb(target->thread.ri_cb);
1240 static const struct user_regset s390_regsets[] = {
1242 .core_note_type = NT_PRSTATUS,
1243 .n = sizeof(s390_regs) / sizeof(long),
1244 .size = sizeof(long),
1245 .align = sizeof(long),
1246 .regset_get = s390_regs_get,
1247 .set = s390_regs_set,
1250 .core_note_type = NT_PRFPREG,
1251 .n = sizeof(s390_fp_regs) / sizeof(long),
1252 .size = sizeof(long),
1253 .align = sizeof(long),
1254 .regset_get = s390_fpregs_get,
1255 .set = s390_fpregs_set,
1258 .core_note_type = NT_S390_SYSTEM_CALL,
1260 .size = sizeof(unsigned int),
1261 .align = sizeof(unsigned int),
1262 .regset_get = s390_system_call_get,
1263 .set = s390_system_call_set,
1266 .core_note_type = NT_S390_LAST_BREAK,
1268 .size = sizeof(long),
1269 .align = sizeof(long),
1270 .regset_get = s390_last_break_get,
1271 .set = s390_last_break_set,
1274 .core_note_type = NT_S390_TDB,
1278 .regset_get = s390_tdb_get,
1279 .set = s390_tdb_set,
1282 .core_note_type = NT_S390_VXRS_LOW,
1283 .n = __NUM_VXRS_LOW,
1284 .size = sizeof(__u64),
1285 .align = sizeof(__u64),
1286 .regset_get = s390_vxrs_low_get,
1287 .set = s390_vxrs_low_set,
1290 .core_note_type = NT_S390_VXRS_HIGH,
1291 .n = __NUM_VXRS_HIGH,
1292 .size = sizeof(__vector128),
1293 .align = sizeof(__vector128),
1294 .regset_get = s390_vxrs_high_get,
1295 .set = s390_vxrs_high_set,
1298 .core_note_type = NT_S390_GS_CB,
1299 .n = sizeof(struct gs_cb) / sizeof(__u64),
1300 .size = sizeof(__u64),
1301 .align = sizeof(__u64),
1302 .regset_get = s390_gs_cb_get,
1303 .set = s390_gs_cb_set,
1306 .core_note_type = NT_S390_GS_BC,
1307 .n = sizeof(struct gs_cb) / sizeof(__u64),
1308 .size = sizeof(__u64),
1309 .align = sizeof(__u64),
1310 .regset_get = s390_gs_bc_get,
1311 .set = s390_gs_bc_set,
1314 .core_note_type = NT_S390_RI_CB,
1315 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1316 .size = sizeof(__u64),
1317 .align = sizeof(__u64),
1318 .regset_get = s390_runtime_instr_get,
1319 .set = s390_runtime_instr_set,
1323 static const struct user_regset_view user_s390_view = {
1325 .e_machine = EM_S390,
1326 .regsets = s390_regsets,
1327 .n = ARRAY_SIZE(s390_regsets)
1330 #ifdef CONFIG_COMPAT
1331 static int s390_compat_regs_get(struct task_struct *target,
1332 const struct user_regset *regset,
1337 if (target == current)
1338 save_access_regs(target->thread.acrs);
1340 for (n = 0; n < sizeof(s390_compat_regs); n += sizeof(compat_ulong_t))
1341 membuf_store(&to, __peek_user_compat(target, n));
1345 static int s390_compat_regs_set(struct task_struct *target,
1346 const struct user_regset *regset,
1347 unsigned int pos, unsigned int count,
1348 const void *kbuf, const void __user *ubuf)
1352 if (target == current)
1353 save_access_regs(target->thread.acrs);
1356 const compat_ulong_t *k = kbuf;
1357 while (count > 0 && !rc) {
1358 rc = __poke_user_compat(target, pos, *k++);
1359 count -= sizeof(*k);
1363 const compat_ulong_t __user *u = ubuf;
1364 while (count > 0 && !rc) {
1365 compat_ulong_t word;
1366 rc = __get_user(word, u++);
1369 rc = __poke_user_compat(target, pos, word);
1370 count -= sizeof(*u);
1375 if (rc == 0 && target == current)
1376 restore_access_regs(target->thread.acrs);
1381 static int s390_compat_regs_high_get(struct task_struct *target,
1382 const struct user_regset *regset,
1385 compat_ulong_t *gprs_high;
1388 gprs_high = (compat_ulong_t *)task_pt_regs(target)->gprs;
1389 for (i = 0; i < NUM_GPRS; i++, gprs_high += 2)
1390 membuf_store(&to, *gprs_high);
1394 static int s390_compat_regs_high_set(struct task_struct *target,
1395 const struct user_regset *regset,
1396 unsigned int pos, unsigned int count,
1397 const void *kbuf, const void __user *ubuf)
1399 compat_ulong_t *gprs_high;
1402 gprs_high = (compat_ulong_t *)
1403 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1405 const compat_ulong_t *k = kbuf;
1409 count -= sizeof(*k);
1412 const compat_ulong_t __user *u = ubuf;
1413 while (count > 0 && !rc) {
1415 rc = __get_user(word, u++);
1420 count -= sizeof(*u);
1427 static int s390_compat_last_break_get(struct task_struct *target,
1428 const struct user_regset *regset,
1431 compat_ulong_t last_break = target->thread.last_break;
1433 return membuf_store(&to, (unsigned long)last_break);
1436 static int s390_compat_last_break_set(struct task_struct *target,
1437 const struct user_regset *regset,
1438 unsigned int pos, unsigned int count,
1439 const void *kbuf, const void __user *ubuf)
1444 static const struct user_regset s390_compat_regsets[] = {
1446 .core_note_type = NT_PRSTATUS,
1447 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1448 .size = sizeof(compat_long_t),
1449 .align = sizeof(compat_long_t),
1450 .regset_get = s390_compat_regs_get,
1451 .set = s390_compat_regs_set,
1454 .core_note_type = NT_PRFPREG,
1455 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1456 .size = sizeof(compat_long_t),
1457 .align = sizeof(compat_long_t),
1458 .regset_get = s390_fpregs_get,
1459 .set = s390_fpregs_set,
1462 .core_note_type = NT_S390_SYSTEM_CALL,
1464 .size = sizeof(compat_uint_t),
1465 .align = sizeof(compat_uint_t),
1466 .regset_get = s390_system_call_get,
1467 .set = s390_system_call_set,
1470 .core_note_type = NT_S390_LAST_BREAK,
1472 .size = sizeof(long),
1473 .align = sizeof(long),
1474 .regset_get = s390_compat_last_break_get,
1475 .set = s390_compat_last_break_set,
1478 .core_note_type = NT_S390_TDB,
1482 .regset_get = s390_tdb_get,
1483 .set = s390_tdb_set,
1486 .core_note_type = NT_S390_VXRS_LOW,
1487 .n = __NUM_VXRS_LOW,
1488 .size = sizeof(__u64),
1489 .align = sizeof(__u64),
1490 .regset_get = s390_vxrs_low_get,
1491 .set = s390_vxrs_low_set,
1494 .core_note_type = NT_S390_VXRS_HIGH,
1495 .n = __NUM_VXRS_HIGH,
1496 .size = sizeof(__vector128),
1497 .align = sizeof(__vector128),
1498 .regset_get = s390_vxrs_high_get,
1499 .set = s390_vxrs_high_set,
1502 .core_note_type = NT_S390_HIGH_GPRS,
1503 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1504 .size = sizeof(compat_long_t),
1505 .align = sizeof(compat_long_t),
1506 .regset_get = s390_compat_regs_high_get,
1507 .set = s390_compat_regs_high_set,
1510 .core_note_type = NT_S390_GS_CB,
1511 .n = sizeof(struct gs_cb) / sizeof(__u64),
1512 .size = sizeof(__u64),
1513 .align = sizeof(__u64),
1514 .regset_get = s390_gs_cb_get,
1515 .set = s390_gs_cb_set,
1518 .core_note_type = NT_S390_GS_BC,
1519 .n = sizeof(struct gs_cb) / sizeof(__u64),
1520 .size = sizeof(__u64),
1521 .align = sizeof(__u64),
1522 .regset_get = s390_gs_bc_get,
1523 .set = s390_gs_bc_set,
1526 .core_note_type = NT_S390_RI_CB,
1527 .n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
1528 .size = sizeof(__u64),
1529 .align = sizeof(__u64),
1530 .regset_get = s390_runtime_instr_get,
1531 .set = s390_runtime_instr_set,
1535 static const struct user_regset_view user_s390_compat_view = {
1537 .e_machine = EM_S390,
1538 .regsets = s390_compat_regsets,
1539 .n = ARRAY_SIZE(s390_compat_regsets)
1543 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1545 #ifdef CONFIG_COMPAT
1546 if (test_tsk_thread_flag(task, TIF_31BIT))
1547 return &user_s390_compat_view;
1549 return &user_s390_view;
1552 static const char *gpr_names[NUM_GPRS] = {
1553 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1554 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1557 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1559 if (offset >= NUM_GPRS)
1561 return regs->gprs[offset];
1564 int regs_query_register_offset(const char *name)
1566 unsigned long offset;
1568 if (!name || *name != 'r')
1570 if (kstrtoul(name + 1, 10, &offset))
1572 if (offset >= NUM_GPRS)
1577 const char *regs_query_register_name(unsigned int offset)
1579 if (offset >= NUM_GPRS)
1581 return gpr_names[offset];
1584 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1586 unsigned long ksp = kernel_stack_pointer(regs);
1588 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1592 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1593 * @regs:pt_regs which contains kernel stack pointer.
1594 * @n:stack entry number.
1596 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1597 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1600 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1604 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1605 if (!regs_within_kernel_stack(regs, addr))
1607 return *(unsigned long *)addr;