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
;