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>
47 REGSET_GENERAL_EXTENDED
,
50 void update_cr_regs(struct task_struct
*task
)
52 struct pt_regs
*regs
= task_pt_regs(task
);
53 struct thread_struct
*thread
= &task
->thread
;
54 struct per_regs old
, new;
57 /* Take care of the enable/disable of transactional execution. */
59 unsigned long cr
[3], cr_new
[3];
61 __ctl_store(cr
, 0, 2);
63 /* Set or clear transaction execution TXC bit 8. */
64 if (task
->thread
.per_flags
& PER_FLAG_NO_TE
)
65 cr_new
[0] = cr
[0] & ~(1UL << 55);
67 cr_new
[0] = cr
[0] | (1UL << 55);
68 /* Set or clear transaction execution TDC bits 62 and 63. */
69 cr_new
[2] = cr
[2] & ~3UL;
70 if (task
->thread
.per_flags
& PER_FLAG_TE_ABORT_RAND
) {
71 if (task
->thread
.per_flags
& PER_FLAG_TE_ABORT_RAND_TEND
)
76 if (memcmp(&cr_new
, &cr
, sizeof(cr
)))
77 __ctl_load(cr_new
, 0, 2);
80 /* Copy user specified PER registers */
81 new.control
= thread
->per_user
.control
;
82 new.start
= thread
->per_user
.start
;
83 new.end
= thread
->per_user
.end
;
85 /* merge TIF_SINGLE_STEP into user specified PER registers. */
86 if (test_tsk_thread_flag(task
, TIF_SINGLE_STEP
)) {
87 new.control
|= PER_EVENT_IFETCH
;
89 new.control
|= PER_CONTROL_SUSPENSION
;
90 new.control
|= PER_EVENT_TRANSACTION_END
;
93 new.end
= PSW_ADDR_INSN
;
96 /* Take care of the PER enablement bit in the PSW. */
97 if (!(new.control
& PER_EVENT_MASK
)) {
98 regs
->psw
.mask
&= ~PSW_MASK_PER
;
101 regs
->psw
.mask
|= PSW_MASK_PER
;
102 __ctl_store(old
, 9, 11);
103 if (memcmp(&new, &old
, sizeof(struct per_regs
)) != 0)
104 __ctl_load(new, 9, 11);
107 void user_enable_single_step(struct task_struct
*task
)
109 set_tsk_thread_flag(task
, TIF_SINGLE_STEP
);
111 update_cr_regs(task
);
114 void user_disable_single_step(struct task_struct
*task
)
116 clear_tsk_thread_flag(task
, TIF_SINGLE_STEP
);
118 update_cr_regs(task
);
122 * Called by kernel/ptrace.c when detaching..
124 * Clear all debugging related fields.
126 void ptrace_disable(struct task_struct
*task
)
128 memset(&task
->thread
.per_user
, 0, sizeof(task
->thread
.per_user
));
129 memset(&task
->thread
.per_event
, 0, sizeof(task
->thread
.per_event
));
130 clear_tsk_thread_flag(task
, TIF_SINGLE_STEP
);
131 clear_tsk_thread_flag(task
, TIF_PER_TRAP
);
132 task
->thread
.per_flags
= 0;
136 # define __ADDR_MASK 3
138 # define __ADDR_MASK 7
141 static inline unsigned long __peek_user_per(struct task_struct
*child
,
144 struct per_struct_kernel
*dummy
= NULL
;
146 if (addr
== (addr_t
) &dummy
->cr9
)
147 /* Control bits of the active per set. */
148 return test_thread_flag(TIF_SINGLE_STEP
) ?
149 PER_EVENT_IFETCH
: child
->thread
.per_user
.control
;
150 else if (addr
== (addr_t
) &dummy
->cr10
)
151 /* Start address of the active per set. */
152 return test_thread_flag(TIF_SINGLE_STEP
) ?
153 0 : child
->thread
.per_user
.start
;
154 else if (addr
== (addr_t
) &dummy
->cr11
)
155 /* End address of the active per set. */
156 return test_thread_flag(TIF_SINGLE_STEP
) ?
157 PSW_ADDR_INSN
: child
->thread
.per_user
.end
;
158 else if (addr
== (addr_t
) &dummy
->bits
)
159 /* Single-step bit. */
160 return test_thread_flag(TIF_SINGLE_STEP
) ?
161 (1UL << (BITS_PER_LONG
- 1)) : 0;
162 else if (addr
== (addr_t
) &dummy
->starting_addr
)
163 /* Start address of the user specified per set. */
164 return child
->thread
.per_user
.start
;
165 else if (addr
== (addr_t
) &dummy
->ending_addr
)
166 /* End address of the user specified per set. */
167 return child
->thread
.per_user
.end
;
168 else if (addr
== (addr_t
) &dummy
->perc_atmid
)
169 /* PER code, ATMID and AI of the last PER trap */
170 return (unsigned long)
171 child
->thread
.per_event
.cause
<< (BITS_PER_LONG
- 16);
172 else if (addr
== (addr_t
) &dummy
->address
)
173 /* Address of the last PER trap */
174 return child
->thread
.per_event
.address
;
175 else if (addr
== (addr_t
) &dummy
->access_id
)
176 /* Access id of the last PER trap */
177 return (unsigned long)
178 child
->thread
.per_event
.paid
<< (BITS_PER_LONG
- 8);
183 * Read the word at offset addr from the user area of a process. The
184 * trouble here is that the information is littered over different
185 * locations. The process registers are found on the kernel stack,
186 * the floating point stuff and the trace settings are stored in
187 * the task structure. In addition the different structures in
188 * struct user contain pad bytes that should be read as zeroes.
191 static unsigned long __peek_user(struct task_struct
*child
, addr_t addr
)
193 struct user
*dummy
= NULL
;
196 if (addr
< (addr_t
) &dummy
->regs
.acrs
) {
198 * psw and gprs are stored on the stack
200 tmp
= *(addr_t
*)((addr_t
) &task_pt_regs(child
)->psw
+ addr
);
201 if (addr
== (addr_t
) &dummy
->regs
.psw
.mask
) {
202 /* Return a clean psw mask. */
203 tmp
&= PSW_MASK_USER
| PSW_MASK_RI
;
204 tmp
|= PSW_USER_BITS
;
207 } else if (addr
< (addr_t
) &dummy
->regs
.orig_gpr2
) {
209 * access registers are stored in the thread structure
211 offset
= addr
- (addr_t
) &dummy
->regs
.acrs
;
214 * Very special case: old & broken 64 bit gdb reading
215 * from acrs[15]. Result is a 64 bit value. Read the
216 * 32 bit acrs[15] value and shift it by 32. Sick...
218 if (addr
== (addr_t
) &dummy
->regs
.acrs
[15])
219 tmp
= ((unsigned long) child
->thread
.acrs
[15]) << 32;
222 tmp
= *(addr_t
*)((addr_t
) &child
->thread
.acrs
+ offset
);
224 } else if (addr
== (addr_t
) &dummy
->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
< (addr_t
) &dummy
->regs
.fp_regs
) {
232 * prevent reads of padding hole between
233 * orig_gpr2 and fp_regs on s390.
237 } else if (addr
< (addr_t
) (&dummy
->regs
.fp_regs
+ 1)) {
239 * floating point regs. are stored in the thread structure
241 offset
= addr
- (addr_t
) &dummy
->regs
.fp_regs
;
242 tmp
= *(addr_t
*)((addr_t
) &child
->thread
.fp_regs
+ offset
);
243 if (addr
== (addr_t
) &dummy
->regs
.fp_regs
.fpc
)
244 tmp
<<= BITS_PER_LONG
- 32;
246 } else if (addr
< (addr_t
) (&dummy
->regs
.per_info
+ 1)) {
248 * Handle access to the per_info structure.
250 addr
-= (addr_t
) &dummy
->regs
.per_info
;
251 tmp
= __peek_user_per(child
, addr
);
260 peek_user(struct task_struct
*child
, addr_t addr
, addr_t data
)
265 * Stupid gdb peeks/pokes the access registers in 64 bit with
266 * an alignment of 4. Programmers from hell...
270 if (addr
>= (addr_t
) &((struct user
*) NULL
)->regs
.acrs
&&
271 addr
< (addr_t
) &((struct user
*) NULL
)->regs
.orig_gpr2
)
274 if ((addr
& mask
) || addr
> sizeof(struct user
) - __ADDR_MASK
)
277 tmp
= __peek_user(child
, addr
);
278 return put_user(tmp
, (addr_t __user
*) data
);
281 static inline void __poke_user_per(struct task_struct
*child
,
282 addr_t addr
, addr_t data
)
284 struct per_struct_kernel
*dummy
= NULL
;
287 * There are only three fields in the per_info struct that the
288 * debugger user can write to.
289 * 1) cr9: the debugger wants to set a new PER event mask
290 * 2) starting_addr: the debugger wants to set a new starting
291 * address to use with the PER event mask.
292 * 3) ending_addr: the debugger wants to set a new ending
293 * address to use with the PER event mask.
294 * The user specified PER event mask and the start and end
295 * addresses are used only if single stepping is not in effect.
296 * Writes to any other field in per_info are ignored.
298 if (addr
== (addr_t
) &dummy
->cr9
)
299 /* PER event mask of the user specified per set. */
300 child
->thread
.per_user
.control
=
301 data
& (PER_EVENT_MASK
| PER_CONTROL_MASK
);
302 else if (addr
== (addr_t
) &dummy
->starting_addr
)
303 /* Starting address of the user specified per set. */
304 child
->thread
.per_user
.start
= data
;
305 else if (addr
== (addr_t
) &dummy
->ending_addr
)
306 /* Ending address of the user specified per set. */
307 child
->thread
.per_user
.end
= data
;
311 * Write a word to the user area of a process at location addr. This
312 * operation does have an additional problem compared to peek_user.
313 * Stores to the program status word and on the floating point
314 * control register needs to get checked for validity.
316 static int __poke_user(struct task_struct
*child
, addr_t addr
, addr_t data
)
318 struct user
*dummy
= NULL
;
321 if (addr
< (addr_t
) &dummy
->regs
.acrs
) {
323 * psw and gprs are stored on the stack
325 if (addr
== (addr_t
) &dummy
->regs
.psw
.mask
) {
326 unsigned long mask
= PSW_MASK_USER
;
328 mask
|= is_ri_task(child
) ? PSW_MASK_RI
: 0;
329 if ((data
& ~mask
) != PSW_USER_BITS
)
331 if ((data
& PSW_MASK_EA
) && !(data
& PSW_MASK_BA
))
334 *(addr_t
*)((addr_t
) &task_pt_regs(child
)->psw
+ addr
) = data
;
336 } else if (addr
< (addr_t
) (&dummy
->regs
.orig_gpr2
)) {
338 * access registers are stored in the thread structure
340 offset
= addr
- (addr_t
) &dummy
->regs
.acrs
;
343 * Very special case: old & broken 64 bit gdb writing
344 * to acrs[15] with a 64 bit value. Ignore the lower
345 * half of the value and write the upper 32 bit to
348 if (addr
== (addr_t
) &dummy
->regs
.acrs
[15])
349 child
->thread
.acrs
[15] = (unsigned int) (data
>> 32);
352 *(addr_t
*)((addr_t
) &child
->thread
.acrs
+ offset
) = data
;
354 } else if (addr
== (addr_t
) &dummy
->regs
.orig_gpr2
) {
356 * orig_gpr2 is stored on the kernel stack
358 task_pt_regs(child
)->orig_gpr2
= data
;
360 } else if (addr
< (addr_t
) &dummy
->regs
.fp_regs
) {
362 * prevent writes of padding hole between
363 * orig_gpr2 and fp_regs on s390.
367 } else if (addr
< (addr_t
) (&dummy
->regs
.fp_regs
+ 1)) {
369 * floating point regs. are stored in the thread structure
371 if (addr
== (addr_t
) &dummy
->regs
.fp_regs
.fpc
)
372 if ((unsigned int) data
!= 0 ||
373 test_fp_ctl(data
>> (BITS_PER_LONG
- 32)))
375 offset
= addr
- (addr_t
) &dummy
->regs
.fp_regs
;
376 *(addr_t
*)((addr_t
) &child
->thread
.fp_regs
+ offset
) = data
;
378 } else if (addr
< (addr_t
) (&dummy
->regs
.per_info
+ 1)) {
380 * Handle access to the per_info structure.
382 addr
-= (addr_t
) &dummy
->regs
.per_info
;
383 __poke_user_per(child
, addr
, data
);
390 static int poke_user(struct task_struct
*child
, addr_t addr
, addr_t data
)
395 * Stupid gdb peeks/pokes the access registers in 64 bit with
396 * an alignment of 4. Programmers from hell indeed...
400 if (addr
>= (addr_t
) &((struct user
*) NULL
)->regs
.acrs
&&
401 addr
< (addr_t
) &((struct user
*) NULL
)->regs
.orig_gpr2
)
404 if ((addr
& mask
) || addr
> sizeof(struct user
) - __ADDR_MASK
)
407 return __poke_user(child
, addr
, data
);
410 long arch_ptrace(struct task_struct
*child
, long request
,
411 unsigned long addr
, unsigned long data
)
418 /* read the word at location addr in the USER area. */
419 return peek_user(child
, addr
, data
);
422 /* write the word at location addr in the USER area */
423 return poke_user(child
, addr
, data
);
425 case PTRACE_PEEKUSR_AREA
:
426 case PTRACE_POKEUSR_AREA
:
427 if (copy_from_user(&parea
, (void __force __user
*) addr
,
430 addr
= parea
.kernel_addr
;
431 data
= parea
.process_addr
;
433 while (copied
< parea
.len
) {
434 if (request
== PTRACE_PEEKUSR_AREA
)
435 ret
= peek_user(child
, addr
, data
);
439 (addr_t __force __user
*) data
))
441 ret
= poke_user(child
, addr
, utmp
);
445 addr
+= sizeof(unsigned long);
446 data
+= sizeof(unsigned long);
447 copied
+= sizeof(unsigned long);
450 case PTRACE_GET_LAST_BREAK
:
451 put_user(task_thread_info(child
)->last_break
,
452 (unsigned long __user
*) data
);
454 case PTRACE_ENABLE_TE
:
457 child
->thread
.per_flags
&= ~PER_FLAG_NO_TE
;
459 case PTRACE_DISABLE_TE
:
462 child
->thread
.per_flags
|= PER_FLAG_NO_TE
;
463 child
->thread
.per_flags
&= ~PER_FLAG_TE_ABORT_RAND
;
465 case PTRACE_TE_ABORT_RAND
:
466 if (!MACHINE_HAS_TE
|| (child
->thread
.per_flags
& PER_FLAG_NO_TE
))
470 child
->thread
.per_flags
&= ~PER_FLAG_TE_ABORT_RAND
;
473 child
->thread
.per_flags
|= PER_FLAG_TE_ABORT_RAND
;
474 child
->thread
.per_flags
|= PER_FLAG_TE_ABORT_RAND_TEND
;
477 child
->thread
.per_flags
|= PER_FLAG_TE_ABORT_RAND
;
478 child
->thread
.per_flags
&= ~PER_FLAG_TE_ABORT_RAND_TEND
;
485 /* Removing high order bit from addr (only for 31 bit). */
486 addr
&= PSW_ADDR_INSN
;
487 return ptrace_request(child
, request
, addr
, data
);
493 * Now the fun part starts... a 31 bit program running in the
494 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
495 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
496 * to handle, the difference to the 64 bit versions of the requests
497 * is that the access is done in multiples of 4 byte instead of
498 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
499 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
500 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
501 * is a 31 bit program too, the content of struct user can be
502 * emulated. A 31 bit program peeking into the struct user of
503 * a 64 bit program is a no-no.
507 * Same as peek_user_per but for a 31 bit program.
509 static inline __u32
__peek_user_per_compat(struct task_struct
*child
,
512 struct compat_per_struct_kernel
*dummy32
= NULL
;
514 if (addr
== (addr_t
) &dummy32
->cr9
)
515 /* Control bits of the active per set. */
516 return (__u32
) test_thread_flag(TIF_SINGLE_STEP
) ?
517 PER_EVENT_IFETCH
: child
->thread
.per_user
.control
;
518 else if (addr
== (addr_t
) &dummy32
->cr10
)
519 /* Start address of the active per set. */
520 return (__u32
) test_thread_flag(TIF_SINGLE_STEP
) ?
521 0 : child
->thread
.per_user
.start
;
522 else if (addr
== (addr_t
) &dummy32
->cr11
)
523 /* End address of the active per set. */
524 return test_thread_flag(TIF_SINGLE_STEP
) ?
525 PSW32_ADDR_INSN
: child
->thread
.per_user
.end
;
526 else if (addr
== (addr_t
) &dummy32
->bits
)
527 /* Single-step bit. */
528 return (__u32
) test_thread_flag(TIF_SINGLE_STEP
) ?
530 else if (addr
== (addr_t
) &dummy32
->starting_addr
)
531 /* Start address of the user specified per set. */
532 return (__u32
) child
->thread
.per_user
.start
;
533 else if (addr
== (addr_t
) &dummy32
->ending_addr
)
534 /* End address of the user specified per set. */
535 return (__u32
) child
->thread
.per_user
.end
;
536 else if (addr
== (addr_t
) &dummy32
->perc_atmid
)
537 /* PER code, ATMID and AI of the last PER trap */
538 return (__u32
) child
->thread
.per_event
.cause
<< 16;
539 else if (addr
== (addr_t
) &dummy32
->address
)
540 /* Address of the last PER trap */
541 return (__u32
) child
->thread
.per_event
.address
;
542 else if (addr
== (addr_t
) &dummy32
->access_id
)
543 /* Access id of the last PER trap */
544 return (__u32
) child
->thread
.per_event
.paid
<< 24;
549 * Same as peek_user but for a 31 bit program.
551 static u32
__peek_user_compat(struct task_struct
*child
, addr_t addr
)
553 struct compat_user
*dummy32
= NULL
;
557 if (addr
< (addr_t
) &dummy32
->regs
.acrs
) {
558 struct pt_regs
*regs
= task_pt_regs(child
);
560 * psw and gprs are stored on the stack
562 if (addr
== (addr_t
) &dummy32
->regs
.psw
.mask
) {
563 /* Fake a 31 bit psw mask. */
564 tmp
= (__u32
)(regs
->psw
.mask
>> 32);
565 tmp
&= PSW32_MASK_USER
| PSW32_MASK_RI
;
566 tmp
|= PSW32_USER_BITS
;
567 } else if (addr
== (addr_t
) &dummy32
->regs
.psw
.addr
) {
568 /* Fake a 31 bit psw address. */
569 tmp
= (__u32
) regs
->psw
.addr
|
570 (__u32
)(regs
->psw
.mask
& PSW_MASK_BA
);
573 tmp
= *(__u32
*)((addr_t
) ®s
->psw
+ addr
*2 + 4);
575 } else if (addr
< (addr_t
) (&dummy32
->regs
.orig_gpr2
)) {
577 * access registers are stored in the thread structure
579 offset
= addr
- (addr_t
) &dummy32
->regs
.acrs
;
580 tmp
= *(__u32
*)((addr_t
) &child
->thread
.acrs
+ offset
);
582 } else if (addr
== (addr_t
) (&dummy32
->regs
.orig_gpr2
)) {
584 * orig_gpr2 is stored on the kernel stack
586 tmp
= *(__u32
*)((addr_t
) &task_pt_regs(child
)->orig_gpr2
+ 4);
588 } else if (addr
< (addr_t
) &dummy32
->regs
.fp_regs
) {
590 * prevent reads of padding hole between
591 * orig_gpr2 and fp_regs on s390.
595 } else if (addr
< (addr_t
) (&dummy32
->regs
.fp_regs
+ 1)) {
597 * floating point regs. are stored in the thread structure
599 offset
= addr
- (addr_t
) &dummy32
->regs
.fp_regs
;
600 tmp
= *(__u32
*)((addr_t
) &child
->thread
.fp_regs
+ offset
);
602 } else if (addr
< (addr_t
) (&dummy32
->regs
.per_info
+ 1)) {
604 * Handle access to the per_info structure.
606 addr
-= (addr_t
) &dummy32
->regs
.per_info
;
607 tmp
= __peek_user_per_compat(child
, addr
);
615 static int peek_user_compat(struct task_struct
*child
,
616 addr_t addr
, addr_t data
)
620 if (!is_compat_task() || (addr
& 3) || addr
> sizeof(struct user
) - 3)
623 tmp
= __peek_user_compat(child
, addr
);
624 return put_user(tmp
, (__u32 __user
*) data
);
628 * Same as poke_user_per but for a 31 bit program.
630 static inline void __poke_user_per_compat(struct task_struct
*child
,
631 addr_t addr
, __u32 data
)
633 struct compat_per_struct_kernel
*dummy32
= NULL
;
635 if (addr
== (addr_t
) &dummy32
->cr9
)
636 /* PER event mask of the user specified per set. */
637 child
->thread
.per_user
.control
=
638 data
& (PER_EVENT_MASK
| PER_CONTROL_MASK
);
639 else if (addr
== (addr_t
) &dummy32
->starting_addr
)
640 /* Starting address of the user specified per set. */
641 child
->thread
.per_user
.start
= data
;
642 else if (addr
== (addr_t
) &dummy32
->ending_addr
)
643 /* Ending address of the user specified per set. */
644 child
->thread
.per_user
.end
= data
;
648 * Same as poke_user but for a 31 bit program.
650 static int __poke_user_compat(struct task_struct
*child
,
651 addr_t addr
, addr_t data
)
653 struct compat_user
*dummy32
= NULL
;
654 __u32 tmp
= (__u32
) data
;
657 if (addr
< (addr_t
) &dummy32
->regs
.acrs
) {
658 struct pt_regs
*regs
= task_pt_regs(child
);
660 * psw, gprs, acrs and orig_gpr2 are stored on the stack
662 if (addr
== (addr_t
) &dummy32
->regs
.psw
.mask
) {
663 __u32 mask
= PSW32_MASK_USER
;
665 mask
|= is_ri_task(child
) ? PSW32_MASK_RI
: 0;
666 /* Build a 64 bit psw mask from 31 bit mask. */
667 if ((tmp
& ~mask
) != PSW32_USER_BITS
)
668 /* Invalid psw mask. */
670 regs
->psw
.mask
= (regs
->psw
.mask
& ~PSW_MASK_USER
) |
671 (regs
->psw
.mask
& PSW_MASK_BA
) |
672 (__u64
)(tmp
& mask
) << 32;
673 } else if (addr
== (addr_t
) &dummy32
->regs
.psw
.addr
) {
674 /* Build a 64 bit psw address from 31 bit address. */
675 regs
->psw
.addr
= (__u64
) tmp
& PSW32_ADDR_INSN
;
676 /* Transfer 31 bit amode bit to psw mask. */
677 regs
->psw
.mask
= (regs
->psw
.mask
& ~PSW_MASK_BA
) |
678 (__u64
)(tmp
& PSW32_ADDR_AMODE
);
681 *(__u32
*)((addr_t
) ®s
->psw
+ addr
*2 + 4) = tmp
;
683 } else if (addr
< (addr_t
) (&dummy32
->regs
.orig_gpr2
)) {
685 * access registers are stored in the thread structure
687 offset
= addr
- (addr_t
) &dummy32
->regs
.acrs
;
688 *(__u32
*)((addr_t
) &child
->thread
.acrs
+ offset
) = tmp
;
690 } else if (addr
== (addr_t
) (&dummy32
->regs
.orig_gpr2
)) {
692 * orig_gpr2 is stored on the kernel stack
694 *(__u32
*)((addr_t
) &task_pt_regs(child
)->orig_gpr2
+ 4) = tmp
;
696 } else if (addr
< (addr_t
) &dummy32
->regs
.fp_regs
) {
698 * prevent writess of padding hole between
699 * orig_gpr2 and fp_regs on s390.
703 } else if (addr
< (addr_t
) (&dummy32
->regs
.fp_regs
+ 1)) {
705 * floating point regs. are stored in the thread structure
707 if (addr
== (addr_t
) &dummy32
->regs
.fp_regs
.fpc
&&
710 offset
= addr
- (addr_t
) &dummy32
->regs
.fp_regs
;
711 *(__u32
*)((addr_t
) &child
->thread
.fp_regs
+ offset
) = tmp
;
713 } else if (addr
< (addr_t
) (&dummy32
->regs
.per_info
+ 1)) {
715 * Handle access to the per_info structure.
717 addr
-= (addr_t
) &dummy32
->regs
.per_info
;
718 __poke_user_per_compat(child
, addr
, data
);
724 static int poke_user_compat(struct task_struct
*child
,
725 addr_t addr
, addr_t data
)
727 if (!is_compat_task() || (addr
& 3) ||
728 addr
> sizeof(struct compat_user
) - 3)
731 return __poke_user_compat(child
, addr
, data
);
734 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
735 compat_ulong_t caddr
, compat_ulong_t cdata
)
737 unsigned long addr
= caddr
;
738 unsigned long data
= cdata
;
739 compat_ptrace_area parea
;
744 /* read the word at location addr in the USER area. */
745 return peek_user_compat(child
, addr
, data
);
748 /* write the word at location addr in the USER area */
749 return poke_user_compat(child
, addr
, data
);
751 case PTRACE_PEEKUSR_AREA
:
752 case PTRACE_POKEUSR_AREA
:
753 if (copy_from_user(&parea
, (void __force __user
*) addr
,
756 addr
= parea
.kernel_addr
;
757 data
= parea
.process_addr
;
759 while (copied
< parea
.len
) {
760 if (request
== PTRACE_PEEKUSR_AREA
)
761 ret
= peek_user_compat(child
, addr
, data
);
765 (__u32 __force __user
*) data
))
767 ret
= poke_user_compat(child
, addr
, utmp
);
771 addr
+= sizeof(unsigned int);
772 data
+= sizeof(unsigned int);
773 copied
+= sizeof(unsigned int);
776 case PTRACE_GET_LAST_BREAK
:
777 put_user(task_thread_info(child
)->last_break
,
778 (unsigned int __user
*) data
);
781 return compat_ptrace_request(child
, request
, addr
, data
);
785 asmlinkage
long do_syscall_trace_enter(struct pt_regs
*regs
)
789 /* Do the secure computing check first. */
790 if (secure_computing(regs
->gprs
[2])) {
791 /* seccomp failures shouldn't expose any additional code. */
797 * The sysc_tracesys code in entry.S stored the system
798 * call number to gprs[2].
800 if (test_thread_flag(TIF_SYSCALL_TRACE
) &&
801 (tracehook_report_syscall_entry(regs
) ||
802 regs
->gprs
[2] >= NR_syscalls
)) {
804 * Tracing decided this syscall should not happen or the
805 * debugger stored an invalid system call number. Skip
806 * the system call and the system call restart handling.
808 clear_thread_flag(TIF_SYSCALL
);
812 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
813 trace_sys_enter(regs
, regs
->gprs
[2]);
815 audit_syscall_entry(is_compat_task() ?
816 AUDIT_ARCH_S390
: AUDIT_ARCH_S390X
,
817 regs
->gprs
[2], regs
->orig_gpr2
,
818 regs
->gprs
[3], regs
->gprs
[4],
821 return ret
?: regs
->gprs
[2];
824 asmlinkage
void do_syscall_trace_exit(struct pt_regs
*regs
)
826 audit_syscall_exit(regs
);
828 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
829 trace_sys_exit(regs
, regs
->gprs
[2]);
831 if (test_thread_flag(TIF_SYSCALL_TRACE
))
832 tracehook_report_syscall_exit(regs
, 0);
836 * user_regset definitions.
839 static int s390_regs_get(struct task_struct
*target
,
840 const struct user_regset
*regset
,
841 unsigned int pos
, unsigned int count
,
842 void *kbuf
, void __user
*ubuf
)
844 if (target
== current
)
845 save_access_regs(target
->thread
.acrs
);
848 unsigned long *k
= kbuf
;
850 *k
++ = __peek_user(target
, pos
);
855 unsigned long __user
*u
= ubuf
;
857 if (__put_user(__peek_user(target
, pos
), u
++))
866 static int s390_regs_set(struct task_struct
*target
,
867 const struct user_regset
*regset
,
868 unsigned int pos
, unsigned int count
,
869 const void *kbuf
, const void __user
*ubuf
)
873 if (target
== current
)
874 save_access_regs(target
->thread
.acrs
);
877 const unsigned long *k
= kbuf
;
878 while (count
> 0 && !rc
) {
879 rc
= __poke_user(target
, pos
, *k
++);
884 const unsigned long __user
*u
= ubuf
;
885 while (count
> 0 && !rc
) {
887 rc
= __get_user(word
, u
++);
890 rc
= __poke_user(target
, pos
, word
);
896 if (rc
== 0 && target
== current
)
897 restore_access_regs(target
->thread
.acrs
);
902 static int s390_fpregs_get(struct task_struct
*target
,
903 const struct user_regset
*regset
, unsigned int pos
,
904 unsigned int count
, void *kbuf
, void __user
*ubuf
)
906 if (target
== current
) {
907 save_fp_ctl(&target
->thread
.fp_regs
.fpc
);
908 save_fp_regs(target
->thread
.fp_regs
.fprs
);
911 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
912 &target
->thread
.fp_regs
, 0, -1);
915 static int s390_fpregs_set(struct task_struct
*target
,
916 const struct user_regset
*regset
, unsigned int pos
,
917 unsigned int count
, const void *kbuf
,
918 const void __user
*ubuf
)
922 if (target
== current
) {
923 save_fp_ctl(&target
->thread
.fp_regs
.fpc
);
924 save_fp_regs(target
->thread
.fp_regs
.fprs
);
927 /* If setting FPC, must validate it first. */
928 if (count
> 0 && pos
< offsetof(s390_fp_regs
, fprs
)) {
929 u32 ufpc
[2] = { target
->thread
.fp_regs
.fpc
, 0 };
930 rc
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
, &ufpc
,
931 0, offsetof(s390_fp_regs
, fprs
));
934 if (ufpc
[1] != 0 || test_fp_ctl(ufpc
[0]))
936 target
->thread
.fp_regs
.fpc
= ufpc
[0];
939 if (rc
== 0 && count
> 0)
940 rc
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
941 target
->thread
.fp_regs
.fprs
,
942 offsetof(s390_fp_regs
, fprs
), -1);
944 if (rc
== 0 && target
== current
) {
945 restore_fp_ctl(&target
->thread
.fp_regs
.fpc
);
946 restore_fp_regs(target
->thread
.fp_regs
.fprs
);
954 static int s390_last_break_get(struct task_struct
*target
,
955 const struct user_regset
*regset
,
956 unsigned int pos
, unsigned int count
,
957 void *kbuf
, void __user
*ubuf
)
961 unsigned long *k
= kbuf
;
962 *k
= task_thread_info(target
)->last_break
;
964 unsigned long __user
*u
= ubuf
;
965 if (__put_user(task_thread_info(target
)->last_break
, u
))
972 static int s390_last_break_set(struct task_struct
*target
,
973 const struct user_regset
*regset
,
974 unsigned int pos
, unsigned int count
,
975 const void *kbuf
, const void __user
*ubuf
)
980 static int s390_tdb_get(struct task_struct
*target
,
981 const struct user_regset
*regset
,
982 unsigned int pos
, unsigned int count
,
983 void *kbuf
, void __user
*ubuf
)
985 struct pt_regs
*regs
= task_pt_regs(target
);
988 if (!(regs
->int_code
& 0x200))
990 data
= target
->thread
.trap_tdb
;
991 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
, data
, 0, 256);
994 static int s390_tdb_set(struct task_struct
*target
,
995 const struct user_regset
*regset
,
996 unsigned int pos
, unsigned int count
,
997 const void *kbuf
, const void __user
*ubuf
)
1004 static int s390_system_call_get(struct task_struct
*target
,
1005 const struct user_regset
*regset
,
1006 unsigned int pos
, unsigned int count
,
1007 void *kbuf
, void __user
*ubuf
)
1009 unsigned int *data
= &task_thread_info(target
)->system_call
;
1010 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
1011 data
, 0, sizeof(unsigned int));
1014 static int s390_system_call_set(struct task_struct
*target
,
1015 const struct user_regset
*regset
,
1016 unsigned int pos
, unsigned int count
,
1017 const void *kbuf
, const void __user
*ubuf
)
1019 unsigned int *data
= &task_thread_info(target
)->system_call
;
1020 return user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
1021 data
, 0, sizeof(unsigned int));
1024 static const struct user_regset s390_regsets
[] = {
1025 [REGSET_GENERAL
] = {
1026 .core_note_type
= NT_PRSTATUS
,
1027 .n
= sizeof(s390_regs
) / sizeof(long),
1028 .size
= sizeof(long),
1029 .align
= sizeof(long),
1030 .get
= s390_regs_get
,
1031 .set
= s390_regs_set
,
1034 .core_note_type
= NT_PRFPREG
,
1035 .n
= sizeof(s390_fp_regs
) / sizeof(long),
1036 .size
= sizeof(long),
1037 .align
= sizeof(long),
1038 .get
= s390_fpregs_get
,
1039 .set
= s390_fpregs_set
,
1042 [REGSET_LAST_BREAK
] = {
1043 .core_note_type
= NT_S390_LAST_BREAK
,
1045 .size
= sizeof(long),
1046 .align
= sizeof(long),
1047 .get
= s390_last_break_get
,
1048 .set
= s390_last_break_set
,
1051 .core_note_type
= NT_S390_TDB
,
1055 .get
= s390_tdb_get
,
1056 .set
= s390_tdb_set
,
1059 [REGSET_SYSTEM_CALL
] = {
1060 .core_note_type
= NT_S390_SYSTEM_CALL
,
1062 .size
= sizeof(unsigned int),
1063 .align
= sizeof(unsigned int),
1064 .get
= s390_system_call_get
,
1065 .set
= s390_system_call_set
,
1069 static const struct user_regset_view user_s390_view
= {
1070 .name
= UTS_MACHINE
,
1071 .e_machine
= EM_S390
,
1072 .regsets
= s390_regsets
,
1073 .n
= ARRAY_SIZE(s390_regsets
)
1076 #ifdef CONFIG_COMPAT
1077 static int s390_compat_regs_get(struct task_struct
*target
,
1078 const struct user_regset
*regset
,
1079 unsigned int pos
, unsigned int count
,
1080 void *kbuf
, void __user
*ubuf
)
1082 if (target
== current
)
1083 save_access_regs(target
->thread
.acrs
);
1086 compat_ulong_t
*k
= kbuf
;
1088 *k
++ = __peek_user_compat(target
, pos
);
1089 count
-= sizeof(*k
);
1093 compat_ulong_t __user
*u
= ubuf
;
1095 if (__put_user(__peek_user_compat(target
, pos
), u
++))
1097 count
-= sizeof(*u
);
1104 static int s390_compat_regs_set(struct task_struct
*target
,
1105 const struct user_regset
*regset
,
1106 unsigned int pos
, unsigned int count
,
1107 const void *kbuf
, const void __user
*ubuf
)
1111 if (target
== current
)
1112 save_access_regs(target
->thread
.acrs
);
1115 const compat_ulong_t
*k
= kbuf
;
1116 while (count
> 0 && !rc
) {
1117 rc
= __poke_user_compat(target
, pos
, *k
++);
1118 count
-= sizeof(*k
);
1122 const compat_ulong_t __user
*u
= ubuf
;
1123 while (count
> 0 && !rc
) {
1124 compat_ulong_t word
;
1125 rc
= __get_user(word
, u
++);
1128 rc
= __poke_user_compat(target
, pos
, word
);
1129 count
-= sizeof(*u
);
1134 if (rc
== 0 && target
== current
)
1135 restore_access_regs(target
->thread
.acrs
);
1140 static int s390_compat_regs_high_get(struct task_struct
*target
,
1141 const struct user_regset
*regset
,
1142 unsigned int pos
, unsigned int count
,
1143 void *kbuf
, void __user
*ubuf
)
1145 compat_ulong_t
*gprs_high
;
1147 gprs_high
= (compat_ulong_t
*)
1148 &task_pt_regs(target
)->gprs
[pos
/ sizeof(compat_ulong_t
)];
1150 compat_ulong_t
*k
= kbuf
;
1154 count
-= sizeof(*k
);
1157 compat_ulong_t __user
*u
= ubuf
;
1159 if (__put_user(*gprs_high
, u
++))
1162 count
-= sizeof(*u
);
1168 static int s390_compat_regs_high_set(struct task_struct
*target
,
1169 const struct user_regset
*regset
,
1170 unsigned int pos
, unsigned int count
,
1171 const void *kbuf
, const void __user
*ubuf
)
1173 compat_ulong_t
*gprs_high
;
1176 gprs_high
= (compat_ulong_t
*)
1177 &task_pt_regs(target
)->gprs
[pos
/ sizeof(compat_ulong_t
)];
1179 const compat_ulong_t
*k
= kbuf
;
1183 count
-= sizeof(*k
);
1186 const compat_ulong_t __user
*u
= ubuf
;
1187 while (count
> 0 && !rc
) {
1189 rc
= __get_user(word
, u
++);
1194 count
-= sizeof(*u
);
1201 static int s390_compat_last_break_get(struct task_struct
*target
,
1202 const struct user_regset
*regset
,
1203 unsigned int pos
, unsigned int count
,
1204 void *kbuf
, void __user
*ubuf
)
1206 compat_ulong_t last_break
;
1209 last_break
= task_thread_info(target
)->last_break
;
1211 unsigned long *k
= kbuf
;
1214 unsigned long __user
*u
= ubuf
;
1215 if (__put_user(last_break
, u
))
1222 static int s390_compat_last_break_set(struct task_struct
*target
,
1223 const struct user_regset
*regset
,
1224 unsigned int pos
, unsigned int count
,
1225 const void *kbuf
, const void __user
*ubuf
)
1230 static const struct user_regset s390_compat_regsets
[] = {
1231 [REGSET_GENERAL
] = {
1232 .core_note_type
= NT_PRSTATUS
,
1233 .n
= sizeof(s390_compat_regs
) / sizeof(compat_long_t
),
1234 .size
= sizeof(compat_long_t
),
1235 .align
= sizeof(compat_long_t
),
1236 .get
= s390_compat_regs_get
,
1237 .set
= s390_compat_regs_set
,
1240 .core_note_type
= NT_PRFPREG
,
1241 .n
= sizeof(s390_fp_regs
) / sizeof(compat_long_t
),
1242 .size
= sizeof(compat_long_t
),
1243 .align
= sizeof(compat_long_t
),
1244 .get
= s390_fpregs_get
,
1245 .set
= s390_fpregs_set
,
1247 [REGSET_LAST_BREAK
] = {
1248 .core_note_type
= NT_S390_LAST_BREAK
,
1250 .size
= sizeof(long),
1251 .align
= sizeof(long),
1252 .get
= s390_compat_last_break_get
,
1253 .set
= s390_compat_last_break_set
,
1256 .core_note_type
= NT_S390_TDB
,
1260 .get
= s390_tdb_get
,
1261 .set
= s390_tdb_set
,
1263 [REGSET_SYSTEM_CALL
] = {
1264 .core_note_type
= NT_S390_SYSTEM_CALL
,
1266 .size
= sizeof(compat_uint_t
),
1267 .align
= sizeof(compat_uint_t
),
1268 .get
= s390_system_call_get
,
1269 .set
= s390_system_call_set
,
1271 [REGSET_GENERAL_EXTENDED
] = {
1272 .core_note_type
= NT_S390_HIGH_GPRS
,
1273 .n
= sizeof(s390_compat_regs_high
) / sizeof(compat_long_t
),
1274 .size
= sizeof(compat_long_t
),
1275 .align
= sizeof(compat_long_t
),
1276 .get
= s390_compat_regs_high_get
,
1277 .set
= s390_compat_regs_high_set
,
1281 static const struct user_regset_view user_s390_compat_view
= {
1283 .e_machine
= EM_S390
,
1284 .regsets
= s390_compat_regsets
,
1285 .n
= ARRAY_SIZE(s390_compat_regsets
)
1289 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1291 #ifdef CONFIG_COMPAT
1292 if (test_tsk_thread_flag(task
, TIF_31BIT
))
1293 return &user_s390_compat_view
;
1295 return &user_s390_view
;
1298 static const char *gpr_names
[NUM_GPRS
] = {
1299 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1300 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1303 unsigned long regs_get_register(struct pt_regs
*regs
, unsigned int offset
)
1305 if (offset
>= NUM_GPRS
)
1307 return regs
->gprs
[offset
];
1310 int regs_query_register_offset(const char *name
)
1312 unsigned long offset
;
1314 if (!name
|| *name
!= 'r')
1316 if (kstrtoul(name
+ 1, 10, &offset
))
1318 if (offset
>= NUM_GPRS
)
1323 const char *regs_query_register_name(unsigned int offset
)
1325 if (offset
>= NUM_GPRS
)
1327 return gpr_names
[offset
];
1330 static int regs_within_kernel_stack(struct pt_regs
*regs
, unsigned long addr
)
1332 unsigned long ksp
= kernel_stack_pointer(regs
);
1334 return (addr
& ~(THREAD_SIZE
- 1)) == (ksp
& ~(THREAD_SIZE
- 1));
1338 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1339 * @regs:pt_regs which contains kernel stack pointer.
1340 * @n:stack entry number.
1342 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1343 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1346 unsigned long regs_get_kernel_stack_nth(struct pt_regs
*regs
, unsigned int n
)
1350 addr
= kernel_stack_pointer(regs
) + n
* sizeof(long);
1351 if (!regs_within_kernel_stack(regs
, addr
))
1353 return *(unsigned long *)addr
;