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;
47 /* Take care of the enable/disable of transactional execution. */
49 unsigned long cr, cr_new;
51 __ctl_store(cr, 0, 0);
52 /* Set or clear transaction execution TXC bit 8. */
53 cr_new = cr | (1UL << 55);
54 if (task->thread.per_flags & PER_FLAG_NO_TE)
55 cr_new &= ~(1UL << 55);
57 __ctl_load(cr_new, 0, 0);
58 /* Set or clear transaction execution TDC bits 62 and 63. */
59 __ctl_store(cr, 2, 2);
61 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
62 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
68 __ctl_load(cr_new, 2, 2);
70 /* Copy user specified PER registers */
71 new.control = thread->per_user.control;
72 new.start = thread->per_user.start;
73 new.end = thread->per_user.end;
75 /* merge TIF_SINGLE_STEP into user specified PER registers. */
76 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
77 test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
78 if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
79 new.control |= PER_EVENT_BRANCH;
81 new.control |= PER_EVENT_IFETCH;
82 new.control |= PER_CONTROL_SUSPENSION;
83 new.control |= PER_EVENT_TRANSACTION_END;
84 if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
85 new.control |= PER_EVENT_IFETCH;
90 /* Take care of the PER enablement bit in the PSW. */
91 if (!(new.control & PER_EVENT_MASK)) {
92 regs->psw.mask &= ~PSW_MASK_PER;
95 regs->psw.mask |= PSW_MASK_PER;
96 __ctl_store(old, 9, 11);
97 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
98 __ctl_load(new, 9, 11);
101 void user_enable_single_step(struct task_struct *task)
103 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
104 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
107 void user_disable_single_step(struct task_struct *task)
109 clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
110 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
113 void user_enable_block_step(struct task_struct *task)
115 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
116 set_tsk_thread_flag(task, TIF_BLOCK_STEP);
120 * Called by kernel/ptrace.c when detaching..
122 * Clear all debugging related fields.
124 void ptrace_disable(struct task_struct *task)
126 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
127 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
128 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
129 clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP);
130 task->thread.per_flags = 0;
133 #define __ADDR_MASK 7
135 static inline unsigned long __peek_user_per(struct task_struct *child,
138 struct per_struct_kernel *dummy = NULL;
140 if (addr == (addr_t) &dummy->cr9)
141 /* Control bits of the active per set. */
142 return test_thread_flag(TIF_SINGLE_STEP) ?
143 PER_EVENT_IFETCH : child->thread.per_user.control;
144 else if (addr == (addr_t) &dummy->cr10)
145 /* Start address of the active per set. */
146 return test_thread_flag(TIF_SINGLE_STEP) ?
147 0 : child->thread.per_user.start;
148 else if (addr == (addr_t) &dummy->cr11)
149 /* End address of the active per set. */
150 return test_thread_flag(TIF_SINGLE_STEP) ?
151 -1UL : child->thread.per_user.end;
152 else if (addr == (addr_t) &dummy->bits)
153 /* Single-step bit. */
154 return test_thread_flag(TIF_SINGLE_STEP) ?
155 (1UL << (BITS_PER_LONG - 1)) : 0;
156 else if (addr == (addr_t) &dummy->starting_addr)
157 /* Start address of the user specified per set. */
158 return child->thread.per_user.start;
159 else if (addr == (addr_t) &dummy->ending_addr)
160 /* End address of the user specified per set. */
161 return child->thread.per_user.end;
162 else if (addr == (addr_t) &dummy->perc_atmid)
163 /* PER code, ATMID and AI of the last PER trap */
164 return (unsigned long)
165 child->thread.per_event.cause << (BITS_PER_LONG - 16);
166 else if (addr == (addr_t) &dummy->address)
167 /* Address of the last PER trap */
168 return child->thread.per_event.address;
169 else if (addr == (addr_t) &dummy->access_id)
170 /* Access id of the last PER trap */
171 return (unsigned long)
172 child->thread.per_event.paid << (BITS_PER_LONG - 8);
177 * Read the word at offset addr from the user area of a process. The
178 * trouble here is that the information is littered over different
179 * locations. The process registers are found on the kernel stack,
180 * the floating point stuff and the trace settings are stored in
181 * the task structure. In addition the different structures in
182 * struct user contain pad bytes that should be read as zeroes.
185 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
187 struct user *dummy = NULL;
190 if (addr < (addr_t) &dummy->regs.acrs) {
192 * psw and gprs are stored on the stack
194 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
195 if (addr == (addr_t) &dummy->regs.psw.mask) {
196 /* Return a clean psw mask. */
197 tmp &= PSW_MASK_USER | PSW_MASK_RI;
198 tmp |= PSW_USER_BITS;
201 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
203 * access registers are stored in the thread structure
205 offset = addr - (addr_t) &dummy->regs.acrs;
207 * Very special case: old & broken 64 bit gdb reading
208 * from acrs[15]. Result is a 64 bit value. Read the
209 * 32 bit acrs[15] value and shift it by 32. Sick...
211 if (addr == (addr_t) &dummy->regs.acrs[15])
212 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
214 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
216 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
218 * orig_gpr2 is stored on the kernel stack
220 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
222 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
224 * prevent reads of padding hole between
225 * orig_gpr2 and fp_regs on s390.
229 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
231 * floating point control reg. is in the thread structure
233 tmp = child->thread.fpu.fpc;
234 tmp <<= BITS_PER_LONG - 32;
236 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
238 * floating point regs. are either in child->thread.fpu
239 * or the child->thread.fpu.vxrs array
241 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
244 ((addr_t) child->thread.fpu.vxrs + 2*offset);
247 ((addr_t) child->thread.fpu.fprs + offset);
249 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
251 * Handle access to the per_info structure.
253 addr -= (addr_t) &dummy->regs.per_info;
254 tmp = __peek_user_per(child, addr);
263 peek_user(struct task_struct *child, addr_t addr, addr_t data)
268 * Stupid gdb peeks/pokes the access registers in 64 bit with
269 * an alignment of 4. Programmers from hell...
272 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
273 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
275 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
278 tmp = __peek_user(child, addr);
279 return put_user(tmp, (addr_t __user *) data);
282 static inline void __poke_user_per(struct task_struct *child,
283 addr_t addr, addr_t data)
285 struct per_struct_kernel *dummy = NULL;
288 * There are only three fields in the per_info struct that the
289 * debugger user can write to.
290 * 1) cr9: the debugger wants to set a new PER event mask
291 * 2) starting_addr: the debugger wants to set a new starting
292 * address to use with the PER event mask.
293 * 3) ending_addr: the debugger wants to set a new ending
294 * address to use with the PER event mask.
295 * The user specified PER event mask and the start and end
296 * addresses are used only if single stepping is not in effect.
297 * Writes to any other field in per_info are ignored.
299 if (addr == (addr_t) &dummy->cr9)
300 /* PER event mask of the user specified per set. */
301 child->thread.per_user.control =
302 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
303 else if (addr == (addr_t) &dummy->starting_addr)
304 /* Starting address of the user specified per set. */
305 child->thread.per_user.start = data;
306 else if (addr == (addr_t) &dummy->ending_addr)
307 /* Ending address of the user specified per set. */
308 child->thread.per_user.end = data;
312 * Write a word to the user area of a process at location addr. This
313 * operation does have an additional problem compared to peek_user.
314 * Stores to the program status word and on the floating point
315 * control register needs to get checked for validity.
317 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
319 struct user *dummy = NULL;
322 if (addr < (addr_t) &dummy->regs.acrs) {
324 * psw and gprs are stored on the stack
326 if (addr == (addr_t) &dummy->regs.psw.mask) {
327 unsigned long mask = PSW_MASK_USER;
329 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
330 if ((data ^ PSW_USER_BITS) & ~mask)
331 /* Invalid psw mask. */
333 if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
334 /* Invalid address-space-control bits */
336 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
337 /* Invalid addressing mode bits */
340 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
342 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
344 * access registers are stored in the thread structure
346 offset = addr - (addr_t) &dummy->regs.acrs;
348 * Very special case: old & broken 64 bit gdb writing
349 * to acrs[15] with a 64 bit value. Ignore the lower
350 * half of the value and write the upper 32 bit to
353 if (addr == (addr_t) &dummy->regs.acrs[15])
354 child->thread.acrs[15] = (unsigned int) (data >> 32);
356 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
358 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
360 * orig_gpr2 is stored on the kernel stack
362 task_pt_regs(child)->orig_gpr2 = data;
364 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
366 * prevent writes of padding hole between
367 * orig_gpr2 and fp_regs on s390.
371 } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) {
373 * floating point control reg. is in the thread structure
375 if ((unsigned int) data != 0 ||
376 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
378 child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32);
380 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
382 * floating point regs. are either in child->thread.fpu
383 * or the child->thread.fpu.vxrs array
385 offset = addr - (addr_t) &dummy->regs.fp_regs.fprs;
388 child->thread.fpu.vxrs + 2*offset) = data;
391 child->thread.fpu.fprs + offset) = data;
393 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
395 * Handle access to the per_info structure.
397 addr -= (addr_t) &dummy->regs.per_info;
398 __poke_user_per(child, addr, data);
405 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
410 * Stupid gdb peeks/pokes the access registers in 64 bit with
411 * an alignment of 4. Programmers from hell indeed...
414 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
415 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
417 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
420 return __poke_user(child, addr, data);
423 long arch_ptrace(struct task_struct *child, long request,
424 unsigned long addr, unsigned long data)
431 /* read the word at location addr in the USER area. */
432 return peek_user(child, addr, data);
435 /* write the word at location addr in the USER area */
436 return poke_user(child, addr, data);
438 case PTRACE_PEEKUSR_AREA:
439 case PTRACE_POKEUSR_AREA:
440 if (copy_from_user(&parea, (void __force __user *) addr,
443 addr = parea.kernel_addr;
444 data = parea.process_addr;
446 while (copied < parea.len) {
447 if (request == PTRACE_PEEKUSR_AREA)
448 ret = peek_user(child, addr, data);
452 (addr_t __force __user *) data))
454 ret = poke_user(child, addr, utmp);
458 addr += sizeof(unsigned long);
459 data += sizeof(unsigned long);
460 copied += sizeof(unsigned long);
463 case PTRACE_GET_LAST_BREAK:
464 put_user(task_thread_info(child)->last_break,
465 (unsigned long __user *) data);
467 case PTRACE_ENABLE_TE:
470 child->thread.per_flags &= ~PER_FLAG_NO_TE;
472 case PTRACE_DISABLE_TE:
475 child->thread.per_flags |= PER_FLAG_NO_TE;
476 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
478 case PTRACE_TE_ABORT_RAND:
479 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
483 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
486 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
487 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
490 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
491 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
498 return ptrace_request(child, request, addr, data);
504 * Now the fun part starts... a 31 bit program running in the
505 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
506 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
507 * to handle, the difference to the 64 bit versions of the requests
508 * is that the access is done in multiples of 4 byte instead of
509 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
510 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
511 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
512 * is a 31 bit program too, the content of struct user can be
513 * emulated. A 31 bit program peeking into the struct user of
514 * a 64 bit program is a no-no.
518 * Same as peek_user_per but for a 31 bit program.
520 static inline __u32 __peek_user_per_compat(struct task_struct *child,
523 struct compat_per_struct_kernel *dummy32 = NULL;
525 if (addr == (addr_t) &dummy32->cr9)
526 /* Control bits of the active per set. */
527 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
528 PER_EVENT_IFETCH : child->thread.per_user.control;
529 else if (addr == (addr_t) &dummy32->cr10)
530 /* Start address of the active per set. */
531 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
532 0 : child->thread.per_user.start;
533 else if (addr == (addr_t) &dummy32->cr11)
534 /* End address of the active per set. */
535 return test_thread_flag(TIF_SINGLE_STEP) ?
536 PSW32_ADDR_INSN : child->thread.per_user.end;
537 else if (addr == (addr_t) &dummy32->bits)
538 /* Single-step bit. */
539 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
541 else if (addr == (addr_t) &dummy32->starting_addr)
542 /* Start address of the user specified per set. */
543 return (__u32) child->thread.per_user.start;
544 else if (addr == (addr_t) &dummy32->ending_addr)
545 /* End address of the user specified per set. */
546 return (__u32) child->thread.per_user.end;
547 else if (addr == (addr_t) &dummy32->perc_atmid)
548 /* PER code, ATMID and AI of the last PER trap */
549 return (__u32) child->thread.per_event.cause << 16;
550 else if (addr == (addr_t) &dummy32->address)
551 /* Address of the last PER trap */
552 return (__u32) child->thread.per_event.address;
553 else if (addr == (addr_t) &dummy32->access_id)
554 /* Access id of the last PER trap */
555 return (__u32) child->thread.per_event.paid << 24;
560 * Same as peek_user but for a 31 bit program.
562 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
564 struct compat_user *dummy32 = NULL;
568 if (addr < (addr_t) &dummy32->regs.acrs) {
569 struct pt_regs *regs = task_pt_regs(child);
571 * psw and gprs are stored on the stack
573 if (addr == (addr_t) &dummy32->regs.psw.mask) {
574 /* Fake a 31 bit psw mask. */
575 tmp = (__u32)(regs->psw.mask >> 32);
576 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
577 tmp |= PSW32_USER_BITS;
578 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
579 /* Fake a 31 bit psw address. */
580 tmp = (__u32) regs->psw.addr |
581 (__u32)(regs->psw.mask & PSW_MASK_BA);
584 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
586 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
588 * access registers are stored in the thread structure
590 offset = addr - (addr_t) &dummy32->regs.acrs;
591 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
593 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
595 * orig_gpr2 is stored on the kernel stack
597 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
599 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
601 * prevent reads of padding hole between
602 * orig_gpr2 and fp_regs on s390.
606 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
608 * floating point control reg. is in the thread structure
610 tmp = child->thread.fpu.fpc;
612 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
614 * floating point regs. are either in child->thread.fpu
615 * or the child->thread.fpu.vxrs array
617 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
620 ((addr_t) child->thread.fpu.vxrs + 2*offset);
623 ((addr_t) child->thread.fpu.fprs + offset);
625 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
627 * Handle access to the per_info structure.
629 addr -= (addr_t) &dummy32->regs.per_info;
630 tmp = __peek_user_per_compat(child, addr);
638 static int peek_user_compat(struct task_struct *child,
639 addr_t addr, addr_t data)
643 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
646 tmp = __peek_user_compat(child, addr);
647 return put_user(tmp, (__u32 __user *) data);
651 * Same as poke_user_per but for a 31 bit program.
653 static inline void __poke_user_per_compat(struct task_struct *child,
654 addr_t addr, __u32 data)
656 struct compat_per_struct_kernel *dummy32 = NULL;
658 if (addr == (addr_t) &dummy32->cr9)
659 /* PER event mask of the user specified per set. */
660 child->thread.per_user.control =
661 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
662 else if (addr == (addr_t) &dummy32->starting_addr)
663 /* Starting address of the user specified per set. */
664 child->thread.per_user.start = data;
665 else if (addr == (addr_t) &dummy32->ending_addr)
666 /* Ending address of the user specified per set. */
667 child->thread.per_user.end = data;
671 * Same as poke_user but for a 31 bit program.
673 static int __poke_user_compat(struct task_struct *child,
674 addr_t addr, addr_t data)
676 struct compat_user *dummy32 = NULL;
677 __u32 tmp = (__u32) data;
680 if (addr < (addr_t) &dummy32->regs.acrs) {
681 struct pt_regs *regs = task_pt_regs(child);
683 * psw, gprs, acrs and orig_gpr2 are stored on the stack
685 if (addr == (addr_t) &dummy32->regs.psw.mask) {
686 __u32 mask = PSW32_MASK_USER;
688 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
689 /* Build a 64 bit psw mask from 31 bit mask. */
690 if ((tmp ^ PSW32_USER_BITS) & ~mask)
691 /* Invalid psw mask. */
693 if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME)
694 /* Invalid address-space-control bits */
696 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
697 (regs->psw.mask & PSW_MASK_BA) |
698 (__u64)(tmp & mask) << 32;
699 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
700 /* Build a 64 bit psw address from 31 bit address. */
701 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
702 /* Transfer 31 bit amode bit to psw mask. */
703 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
704 (__u64)(tmp & PSW32_ADDR_AMODE);
707 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
709 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
711 * access registers are stored in the thread structure
713 offset = addr - (addr_t) &dummy32->regs.acrs;
714 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
716 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
718 * orig_gpr2 is stored on the kernel stack
720 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
722 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
724 * prevent writess of padding hole between
725 * orig_gpr2 and fp_regs on s390.
729 } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) {
731 * floating point control reg. is in the thread structure
733 if (test_fp_ctl(tmp))
735 child->thread.fpu.fpc = data;
737 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
739 * floating point regs. are either in child->thread.fpu
740 * or the child->thread.fpu.vxrs array
742 offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs;
745 child->thread.fpu.vxrs + 2*offset) = tmp;
748 child->thread.fpu.fprs + offset) = tmp;
750 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
752 * Handle access to the per_info structure.
754 addr -= (addr_t) &dummy32->regs.per_info;
755 __poke_user_per_compat(child, addr, data);
761 static int poke_user_compat(struct task_struct *child,
762 addr_t addr, addr_t data)
764 if (!is_compat_task() || (addr & 3) ||
765 addr > sizeof(struct compat_user) - 3)
768 return __poke_user_compat(child, addr, data);
771 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
772 compat_ulong_t caddr, compat_ulong_t cdata)
774 unsigned long addr = caddr;
775 unsigned long data = cdata;
776 compat_ptrace_area parea;
781 /* read the word at location addr in the USER area. */
782 return peek_user_compat(child, addr, data);
785 /* write the word at location addr in the USER area */
786 return poke_user_compat(child, addr, data);
788 case PTRACE_PEEKUSR_AREA:
789 case PTRACE_POKEUSR_AREA:
790 if (copy_from_user(&parea, (void __force __user *) addr,
793 addr = parea.kernel_addr;
794 data = parea.process_addr;
796 while (copied < parea.len) {
797 if (request == PTRACE_PEEKUSR_AREA)
798 ret = peek_user_compat(child, addr, data);
802 (__u32 __force __user *) data))
804 ret = poke_user_compat(child, addr, utmp);
808 addr += sizeof(unsigned int);
809 data += sizeof(unsigned int);
810 copied += sizeof(unsigned int);
813 case PTRACE_GET_LAST_BREAK:
814 put_user(task_thread_info(child)->last_break,
815 (unsigned int __user *) data);
818 return compat_ptrace_request(child, request, addr, data);
822 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
826 /* Do the secure computing check first. */
827 if (secure_computing()) {
828 /* seccomp failures shouldn't expose any additional code. */
834 * The sysc_tracesys code in entry.S stored the system
835 * call number to gprs[2].
837 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
838 (tracehook_report_syscall_entry(regs) ||
839 regs->gprs[2] >= NR_syscalls)) {
841 * Tracing decided this syscall should not happen or the
842 * debugger stored an invalid system call number. Skip
843 * the system call and the system call restart handling.
845 clear_pt_regs_flag(regs, PIF_SYSCALL);
849 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
850 trace_sys_enter(regs, regs->gprs[2]);
852 audit_syscall_entry(regs->gprs[2], regs->orig_gpr2,
853 regs->gprs[3], regs->gprs[4],
856 return ret ?: regs->gprs[2];
859 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
861 audit_syscall_exit(regs);
863 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
864 trace_sys_exit(regs, regs->gprs[2]);
866 if (test_thread_flag(TIF_SYSCALL_TRACE))
867 tracehook_report_syscall_exit(regs, 0);
871 * user_regset definitions.
874 static int s390_regs_get(struct task_struct *target,
875 const struct user_regset *regset,
876 unsigned int pos, unsigned int count,
877 void *kbuf, void __user *ubuf)
879 if (target == current)
880 save_access_regs(target->thread.acrs);
883 unsigned long *k = kbuf;
885 *k++ = __peek_user(target, pos);
890 unsigned long __user *u = ubuf;
892 if (__put_user(__peek_user(target, pos), u++))
901 static int s390_regs_set(struct task_struct *target,
902 const struct user_regset *regset,
903 unsigned int pos, unsigned int count,
904 const void *kbuf, const void __user *ubuf)
908 if (target == current)
909 save_access_regs(target->thread.acrs);
912 const unsigned long *k = kbuf;
913 while (count > 0 && !rc) {
914 rc = __poke_user(target, pos, *k++);
919 const unsigned long __user *u = ubuf;
920 while (count > 0 && !rc) {
922 rc = __get_user(word, u++);
925 rc = __poke_user(target, pos, word);
931 if (rc == 0 && target == current)
932 restore_access_regs(target->thread.acrs);
937 static int s390_fpregs_get(struct task_struct *target,
938 const struct user_regset *regset, unsigned int pos,
939 unsigned int count, void *kbuf, void __user *ubuf)
941 _s390_fp_regs fp_regs;
943 if (target == current)
946 fp_regs.fpc = target->thread.fpu.fpc;
947 fpregs_store(&fp_regs, &target->thread.fpu);
949 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
953 static int s390_fpregs_set(struct task_struct *target,
954 const struct user_regset *regset, unsigned int pos,
955 unsigned int count, const void *kbuf,
956 const void __user *ubuf)
959 freg_t fprs[__NUM_FPRS];
961 if (target == current)
964 /* If setting FPC, must validate it first. */
965 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
966 u32 ufpc[2] = { target->thread.fpu.fpc, 0 };
967 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
968 0, offsetof(s390_fp_regs, fprs));
971 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
973 target->thread.fpu.fpc = ufpc[0];
976 if (rc == 0 && count > 0)
977 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
978 fprs, offsetof(s390_fp_regs, fprs), -1);
983 convert_fp_to_vx(target->thread.fpu.vxrs, fprs);
985 memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs));
990 static int s390_last_break_get(struct task_struct *target,
991 const struct user_regset *regset,
992 unsigned int pos, unsigned int count,
993 void *kbuf, void __user *ubuf)
997 unsigned long *k = kbuf;
998 *k = task_thread_info(target)->last_break;
1000 unsigned long __user *u = ubuf;
1001 if (__put_user(task_thread_info(target)->last_break, u))
1008 static int s390_last_break_set(struct task_struct *target,
1009 const struct user_regset *regset,
1010 unsigned int pos, unsigned int count,
1011 const void *kbuf, const void __user *ubuf)
1016 static int s390_tdb_get(struct task_struct *target,
1017 const struct user_regset *regset,
1018 unsigned int pos, unsigned int count,
1019 void *kbuf, void __user *ubuf)
1021 struct pt_regs *regs = task_pt_regs(target);
1022 unsigned char *data;
1024 if (!(regs->int_code & 0x200))
1026 data = target->thread.trap_tdb;
1027 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
1030 static int s390_tdb_set(struct task_struct *target,
1031 const struct user_regset *regset,
1032 unsigned int pos, unsigned int count,
1033 const void *kbuf, const void __user *ubuf)
1038 static int s390_vxrs_low_get(struct task_struct *target,
1039 const struct user_regset *regset,
1040 unsigned int pos, unsigned int count,
1041 void *kbuf, void __user *ubuf)
1043 __u64 vxrs[__NUM_VXRS_LOW];
1046 if (!MACHINE_HAS_VX)
1048 if (target == current)
1050 for (i = 0; i < __NUM_VXRS_LOW; i++)
1051 vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1);
1052 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1055 static int s390_vxrs_low_set(struct task_struct *target,
1056 const struct user_regset *regset,
1057 unsigned int pos, unsigned int count,
1058 const void *kbuf, const void __user *ubuf)
1060 __u64 vxrs[__NUM_VXRS_LOW];
1063 if (!MACHINE_HAS_VX)
1065 if (target == current)
1068 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1070 for (i = 0; i < __NUM_VXRS_LOW; i++)
1071 *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i];
1076 static int s390_vxrs_high_get(struct task_struct *target,
1077 const struct user_regset *regset,
1078 unsigned int pos, unsigned int count,
1079 void *kbuf, void __user *ubuf)
1081 __vector128 vxrs[__NUM_VXRS_HIGH];
1083 if (!MACHINE_HAS_VX)
1085 if (target == current)
1087 memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs));
1089 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
1092 static int s390_vxrs_high_set(struct task_struct *target,
1093 const struct user_regset *regset,
1094 unsigned int pos, unsigned int count,
1095 const void *kbuf, const void __user *ubuf)
1099 if (!MACHINE_HAS_VX)
1101 if (target == current)
1104 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1105 target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1);
1109 static int s390_system_call_get(struct task_struct *target,
1110 const struct user_regset *regset,
1111 unsigned int pos, unsigned int count,
1112 void *kbuf, void __user *ubuf)
1114 unsigned int *data = &task_thread_info(target)->system_call;
1115 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1116 data, 0, sizeof(unsigned int));
1119 static int s390_system_call_set(struct task_struct *target,
1120 const struct user_regset *regset,
1121 unsigned int pos, unsigned int count,
1122 const void *kbuf, const void __user *ubuf)
1124 unsigned int *data = &task_thread_info(target)->system_call;
1125 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1126 data, 0, sizeof(unsigned int));
1129 static const struct user_regset s390_regsets[] = {
1131 .core_note_type = NT_PRSTATUS,
1132 .n = sizeof(s390_regs) / sizeof(long),
1133 .size = sizeof(long),
1134 .align = sizeof(long),
1135 .get = s390_regs_get,
1136 .set = s390_regs_set,
1139 .core_note_type = NT_PRFPREG,
1140 .n = sizeof(s390_fp_regs) / sizeof(long),
1141 .size = sizeof(long),
1142 .align = sizeof(long),
1143 .get = s390_fpregs_get,
1144 .set = s390_fpregs_set,
1147 .core_note_type = NT_S390_SYSTEM_CALL,
1149 .size = sizeof(unsigned int),
1150 .align = sizeof(unsigned int),
1151 .get = s390_system_call_get,
1152 .set = s390_system_call_set,
1155 .core_note_type = NT_S390_LAST_BREAK,
1157 .size = sizeof(long),
1158 .align = sizeof(long),
1159 .get = s390_last_break_get,
1160 .set = s390_last_break_set,
1163 .core_note_type = NT_S390_TDB,
1167 .get = s390_tdb_get,
1168 .set = s390_tdb_set,
1171 .core_note_type = NT_S390_VXRS_LOW,
1172 .n = __NUM_VXRS_LOW,
1173 .size = sizeof(__u64),
1174 .align = sizeof(__u64),
1175 .get = s390_vxrs_low_get,
1176 .set = s390_vxrs_low_set,
1179 .core_note_type = NT_S390_VXRS_HIGH,
1180 .n = __NUM_VXRS_HIGH,
1181 .size = sizeof(__vector128),
1182 .align = sizeof(__vector128),
1183 .get = s390_vxrs_high_get,
1184 .set = s390_vxrs_high_set,
1188 static const struct user_regset_view user_s390_view = {
1189 .name = UTS_MACHINE,
1190 .e_machine = EM_S390,
1191 .regsets = s390_regsets,
1192 .n = ARRAY_SIZE(s390_regsets)
1195 #ifdef CONFIG_COMPAT
1196 static int s390_compat_regs_get(struct task_struct *target,
1197 const struct user_regset *regset,
1198 unsigned int pos, unsigned int count,
1199 void *kbuf, void __user *ubuf)
1201 if (target == current)
1202 save_access_regs(target->thread.acrs);
1205 compat_ulong_t *k = kbuf;
1207 *k++ = __peek_user_compat(target, pos);
1208 count -= sizeof(*k);
1212 compat_ulong_t __user *u = ubuf;
1214 if (__put_user(__peek_user_compat(target, pos), u++))
1216 count -= sizeof(*u);
1223 static int s390_compat_regs_set(struct task_struct *target,
1224 const struct user_regset *regset,
1225 unsigned int pos, unsigned int count,
1226 const void *kbuf, const void __user *ubuf)
1230 if (target == current)
1231 save_access_regs(target->thread.acrs);
1234 const compat_ulong_t *k = kbuf;
1235 while (count > 0 && !rc) {
1236 rc = __poke_user_compat(target, pos, *k++);
1237 count -= sizeof(*k);
1241 const compat_ulong_t __user *u = ubuf;
1242 while (count > 0 && !rc) {
1243 compat_ulong_t word;
1244 rc = __get_user(word, u++);
1247 rc = __poke_user_compat(target, pos, word);
1248 count -= sizeof(*u);
1253 if (rc == 0 && target == current)
1254 restore_access_regs(target->thread.acrs);
1259 static int s390_compat_regs_high_get(struct task_struct *target,
1260 const struct user_regset *regset,
1261 unsigned int pos, unsigned int count,
1262 void *kbuf, void __user *ubuf)
1264 compat_ulong_t *gprs_high;
1266 gprs_high = (compat_ulong_t *)
1267 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1269 compat_ulong_t *k = kbuf;
1273 count -= sizeof(*k);
1276 compat_ulong_t __user *u = ubuf;
1278 if (__put_user(*gprs_high, u++))
1281 count -= sizeof(*u);
1287 static int s390_compat_regs_high_set(struct task_struct *target,
1288 const struct user_regset *regset,
1289 unsigned int pos, unsigned int count,
1290 const void *kbuf, const void __user *ubuf)
1292 compat_ulong_t *gprs_high;
1295 gprs_high = (compat_ulong_t *)
1296 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1298 const compat_ulong_t *k = kbuf;
1302 count -= sizeof(*k);
1305 const compat_ulong_t __user *u = ubuf;
1306 while (count > 0 && !rc) {
1308 rc = __get_user(word, u++);
1313 count -= sizeof(*u);
1320 static int s390_compat_last_break_get(struct task_struct *target,
1321 const struct user_regset *regset,
1322 unsigned int pos, unsigned int count,
1323 void *kbuf, void __user *ubuf)
1325 compat_ulong_t last_break;
1328 last_break = task_thread_info(target)->last_break;
1330 unsigned long *k = kbuf;
1333 unsigned long __user *u = ubuf;
1334 if (__put_user(last_break, u))
1341 static int s390_compat_last_break_set(struct task_struct *target,
1342 const struct user_regset *regset,
1343 unsigned int pos, unsigned int count,
1344 const void *kbuf, const void __user *ubuf)
1349 static const struct user_regset s390_compat_regsets[] = {
1351 .core_note_type = NT_PRSTATUS,
1352 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1353 .size = sizeof(compat_long_t),
1354 .align = sizeof(compat_long_t),
1355 .get = s390_compat_regs_get,
1356 .set = s390_compat_regs_set,
1359 .core_note_type = NT_PRFPREG,
1360 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1361 .size = sizeof(compat_long_t),
1362 .align = sizeof(compat_long_t),
1363 .get = s390_fpregs_get,
1364 .set = s390_fpregs_set,
1367 .core_note_type = NT_S390_SYSTEM_CALL,
1369 .size = sizeof(compat_uint_t),
1370 .align = sizeof(compat_uint_t),
1371 .get = s390_system_call_get,
1372 .set = s390_system_call_set,
1375 .core_note_type = NT_S390_LAST_BREAK,
1377 .size = sizeof(long),
1378 .align = sizeof(long),
1379 .get = s390_compat_last_break_get,
1380 .set = s390_compat_last_break_set,
1383 .core_note_type = NT_S390_TDB,
1387 .get = s390_tdb_get,
1388 .set = s390_tdb_set,
1391 .core_note_type = NT_S390_VXRS_LOW,
1392 .n = __NUM_VXRS_LOW,
1393 .size = sizeof(__u64),
1394 .align = sizeof(__u64),
1395 .get = s390_vxrs_low_get,
1396 .set = s390_vxrs_low_set,
1399 .core_note_type = NT_S390_VXRS_HIGH,
1400 .n = __NUM_VXRS_HIGH,
1401 .size = sizeof(__vector128),
1402 .align = sizeof(__vector128),
1403 .get = s390_vxrs_high_get,
1404 .set = s390_vxrs_high_set,
1407 .core_note_type = NT_S390_HIGH_GPRS,
1408 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1409 .size = sizeof(compat_long_t),
1410 .align = sizeof(compat_long_t),
1411 .get = s390_compat_regs_high_get,
1412 .set = s390_compat_regs_high_set,
1416 static const struct user_regset_view user_s390_compat_view = {
1418 .e_machine = EM_S390,
1419 .regsets = s390_compat_regsets,
1420 .n = ARRAY_SIZE(s390_compat_regsets)
1424 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1426 #ifdef CONFIG_COMPAT
1427 if (test_tsk_thread_flag(task, TIF_31BIT))
1428 return &user_s390_compat_view;
1430 return &user_s390_view;
1433 static const char *gpr_names[NUM_GPRS] = {
1434 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1435 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1438 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1440 if (offset >= NUM_GPRS)
1442 return regs->gprs[offset];
1445 int regs_query_register_offset(const char *name)
1447 unsigned long offset;
1449 if (!name || *name != 'r')
1451 if (kstrtoul(name + 1, 10, &offset))
1453 if (offset >= NUM_GPRS)
1458 const char *regs_query_register_name(unsigned int offset)
1460 if (offset >= NUM_GPRS)
1462 return gpr_names[offset];
1465 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1467 unsigned long ksp = kernel_stack_pointer(regs);
1469 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1473 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1474 * @regs:pt_regs which contains kernel stack pointer.
1475 * @n:stack entry number.
1477 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1478 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1481 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1485 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1486 if (!regs_within_kernel_stack(regs, addr))
1488 return *(unsigned long *)addr;