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, cr_new;
61 __ctl_store(cr, 0, 0);
62 /* Set or clear transaction execution TXC bit 8. */
63 cr_new = cr | (1UL << 55);
64 if (task->thread.per_flags & PER_FLAG_NO_TE)
65 cr_new &= ~(1UL << 55);
68 /* Set or clear transaction execution TDC bits 62 and 63. */
69 __ctl_store(cr, 2, 2);
71 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
72 if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
78 __ctl_load(cr_new, 2, 2);
81 /* Copy user specified PER registers */
82 new.control = thread->per_user.control;
83 new.start = thread->per_user.start;
84 new.end = thread->per_user.end;
86 /* merge TIF_SINGLE_STEP into user specified PER registers. */
87 if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) {
88 new.control |= PER_EVENT_IFETCH;
90 new.control |= PER_CONTROL_SUSPENSION;
91 new.control |= PER_EVENT_TRANSACTION_END;
94 new.end = PSW_ADDR_INSN;
97 /* Take care of the PER enablement bit in the PSW. */
98 if (!(new.control & PER_EVENT_MASK)) {
99 regs->psw.mask &= ~PSW_MASK_PER;
102 regs->psw.mask |= PSW_MASK_PER;
103 __ctl_store(old, 9, 11);
104 if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
105 __ctl_load(new, 9, 11);
108 void user_enable_single_step(struct task_struct *task)
110 set_tsk_thread_flag(task, TIF_SINGLE_STEP);
113 void user_disable_single_step(struct task_struct *task)
115 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
119 * Called by kernel/ptrace.c when detaching..
121 * Clear all debugging related fields.
123 void ptrace_disable(struct task_struct *task)
125 memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
126 memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
127 clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
128 clear_tsk_thread_flag(task, TIF_PER_TRAP);
129 task->thread.per_flags = 0;
133 # define __ADDR_MASK 3
135 # define __ADDR_MASK 7
138 static inline unsigned long __peek_user_per(struct task_struct *child,
141 struct per_struct_kernel *dummy = NULL;
143 if (addr == (addr_t) &dummy->cr9)
144 /* Control bits of the active per set. */
145 return test_thread_flag(TIF_SINGLE_STEP) ?
146 PER_EVENT_IFETCH : child->thread.per_user.control;
147 else if (addr == (addr_t) &dummy->cr10)
148 /* Start address of the active per set. */
149 return test_thread_flag(TIF_SINGLE_STEP) ?
150 0 : child->thread.per_user.start;
151 else if (addr == (addr_t) &dummy->cr11)
152 /* End address of the active per set. */
153 return test_thread_flag(TIF_SINGLE_STEP) ?
154 PSW_ADDR_INSN : child->thread.per_user.end;
155 else if (addr == (addr_t) &dummy->bits)
156 /* Single-step bit. */
157 return test_thread_flag(TIF_SINGLE_STEP) ?
158 (1UL << (BITS_PER_LONG - 1)) : 0;
159 else if (addr == (addr_t) &dummy->starting_addr)
160 /* Start address of the user specified per set. */
161 return child->thread.per_user.start;
162 else if (addr == (addr_t) &dummy->ending_addr)
163 /* End address of the user specified per set. */
164 return child->thread.per_user.end;
165 else if (addr == (addr_t) &dummy->perc_atmid)
166 /* PER code, ATMID and AI of the last PER trap */
167 return (unsigned long)
168 child->thread.per_event.cause << (BITS_PER_LONG - 16);
169 else if (addr == (addr_t) &dummy->address)
170 /* Address of the last PER trap */
171 return child->thread.per_event.address;
172 else if (addr == (addr_t) &dummy->access_id)
173 /* Access id of the last PER trap */
174 return (unsigned long)
175 child->thread.per_event.paid << (BITS_PER_LONG - 8);
180 * Read the word at offset addr from the user area of a process. The
181 * trouble here is that the information is littered over different
182 * locations. The process registers are found on the kernel stack,
183 * the floating point stuff and the trace settings are stored in
184 * the task structure. In addition the different structures in
185 * struct user contain pad bytes that should be read as zeroes.
188 static unsigned long __peek_user(struct task_struct *child, addr_t addr)
190 struct user *dummy = NULL;
193 if (addr < (addr_t) &dummy->regs.acrs) {
195 * psw and gprs are stored on the stack
197 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
198 if (addr == (addr_t) &dummy->regs.psw.mask) {
199 /* Return a clean psw mask. */
200 tmp &= PSW_MASK_USER | PSW_MASK_RI;
201 tmp |= PSW_USER_BITS;
204 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
206 * access registers are stored in the thread structure
208 offset = addr - (addr_t) &dummy->regs.acrs;
211 * Very special case: old & broken 64 bit gdb reading
212 * from acrs[15]. Result is a 64 bit value. Read the
213 * 32 bit acrs[15] value and shift it by 32. Sick...
215 if (addr == (addr_t) &dummy->regs.acrs[15])
216 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
219 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
221 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
223 * orig_gpr2 is stored on the kernel stack
225 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
227 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
229 * prevent reads of padding hole between
230 * orig_gpr2 and fp_regs on s390.
234 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
236 * floating point regs. are stored in the thread structure
238 offset = addr - (addr_t) &dummy->regs.fp_regs;
239 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
240 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
241 tmp <<= BITS_PER_LONG - 32;
243 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
245 * Handle access to the per_info structure.
247 addr -= (addr_t) &dummy->regs.per_info;
248 tmp = __peek_user_per(child, addr);
257 peek_user(struct task_struct *child, addr_t addr, addr_t data)
262 * Stupid gdb peeks/pokes the access registers in 64 bit with
263 * an alignment of 4. Programmers from hell...
267 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
268 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
271 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
274 tmp = __peek_user(child, addr);
275 return put_user(tmp, (addr_t __user *) data);
278 static inline void __poke_user_per(struct task_struct *child,
279 addr_t addr, addr_t data)
281 struct per_struct_kernel *dummy = NULL;
284 * There are only three fields in the per_info struct that the
285 * debugger user can write to.
286 * 1) cr9: the debugger wants to set a new PER event mask
287 * 2) starting_addr: the debugger wants to set a new starting
288 * address to use with the PER event mask.
289 * 3) ending_addr: the debugger wants to set a new ending
290 * address to use with the PER event mask.
291 * The user specified PER event mask and the start and end
292 * addresses are used only if single stepping is not in effect.
293 * Writes to any other field in per_info are ignored.
295 if (addr == (addr_t) &dummy->cr9)
296 /* PER event mask of the user specified per set. */
297 child->thread.per_user.control =
298 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
299 else if (addr == (addr_t) &dummy->starting_addr)
300 /* Starting address of the user specified per set. */
301 child->thread.per_user.start = data;
302 else if (addr == (addr_t) &dummy->ending_addr)
303 /* Ending address of the user specified per set. */
304 child->thread.per_user.end = data;
308 * Write a word to the user area of a process at location addr. This
309 * operation does have an additional problem compared to peek_user.
310 * Stores to the program status word and on the floating point
311 * control register needs to get checked for validity.
313 static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
315 struct user *dummy = NULL;
318 if (addr < (addr_t) &dummy->regs.acrs) {
320 * psw and gprs are stored on the stack
322 if (addr == (addr_t) &dummy->regs.psw.mask) {
323 unsigned long mask = PSW_MASK_USER;
325 mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
326 if ((data & ~mask) != PSW_USER_BITS)
328 if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
331 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
333 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
335 * access registers are stored in the thread structure
337 offset = addr - (addr_t) &dummy->regs.acrs;
340 * Very special case: old & broken 64 bit gdb writing
341 * to acrs[15] with a 64 bit value. Ignore the lower
342 * half of the value and write the upper 32 bit to
345 if (addr == (addr_t) &dummy->regs.acrs[15])
346 child->thread.acrs[15] = (unsigned int) (data >> 32);
349 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
351 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
353 * orig_gpr2 is stored on the kernel stack
355 task_pt_regs(child)->orig_gpr2 = data;
357 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
359 * prevent writes of padding hole between
360 * orig_gpr2 and fp_regs on s390.
364 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
366 * floating point regs. are stored in the thread structure
368 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
369 if ((unsigned int) data != 0 ||
370 test_fp_ctl(data >> (BITS_PER_LONG - 32)))
372 offset = addr - (addr_t) &dummy->regs.fp_regs;
373 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
375 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
377 * Handle access to the per_info structure.
379 addr -= (addr_t) &dummy->regs.per_info;
380 __poke_user_per(child, addr, data);
387 static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
392 * Stupid gdb peeks/pokes the access registers in 64 bit with
393 * an alignment of 4. Programmers from hell indeed...
397 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
398 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
401 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
404 return __poke_user(child, addr, data);
407 long arch_ptrace(struct task_struct *child, long request,
408 unsigned long addr, unsigned long data)
415 /* read the word at location addr in the USER area. */
416 return peek_user(child, addr, data);
419 /* write the word at location addr in the USER area */
420 return poke_user(child, addr, data);
422 case PTRACE_PEEKUSR_AREA:
423 case PTRACE_POKEUSR_AREA:
424 if (copy_from_user(&parea, (void __force __user *) addr,
427 addr = parea.kernel_addr;
428 data = parea.process_addr;
430 while (copied < parea.len) {
431 if (request == PTRACE_PEEKUSR_AREA)
432 ret = peek_user(child, addr, data);
436 (addr_t __force __user *) data))
438 ret = poke_user(child, addr, utmp);
442 addr += sizeof(unsigned long);
443 data += sizeof(unsigned long);
444 copied += sizeof(unsigned long);
447 case PTRACE_GET_LAST_BREAK:
448 put_user(task_thread_info(child)->last_break,
449 (unsigned long __user *) data);
451 case PTRACE_ENABLE_TE:
454 child->thread.per_flags &= ~PER_FLAG_NO_TE;
456 case PTRACE_DISABLE_TE:
459 child->thread.per_flags |= PER_FLAG_NO_TE;
460 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
462 case PTRACE_TE_ABORT_RAND:
463 if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE))
467 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
470 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
471 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
474 child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
475 child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
482 /* Removing high order bit from addr (only for 31 bit). */
483 addr &= PSW_ADDR_INSN;
484 return ptrace_request(child, request, addr, data);
490 * Now the fun part starts... a 31 bit program running in the
491 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
492 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
493 * to handle, the difference to the 64 bit versions of the requests
494 * is that the access is done in multiples of 4 byte instead of
495 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
496 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
497 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
498 * is a 31 bit program too, the content of struct user can be
499 * emulated. A 31 bit program peeking into the struct user of
500 * a 64 bit program is a no-no.
504 * Same as peek_user_per but for a 31 bit program.
506 static inline __u32 __peek_user_per_compat(struct task_struct *child,
509 struct compat_per_struct_kernel *dummy32 = NULL;
511 if (addr == (addr_t) &dummy32->cr9)
512 /* Control bits of the active per set. */
513 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
514 PER_EVENT_IFETCH : child->thread.per_user.control;
515 else if (addr == (addr_t) &dummy32->cr10)
516 /* Start address of the active per set. */
517 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
518 0 : child->thread.per_user.start;
519 else if (addr == (addr_t) &dummy32->cr11)
520 /* End address of the active per set. */
521 return test_thread_flag(TIF_SINGLE_STEP) ?
522 PSW32_ADDR_INSN : child->thread.per_user.end;
523 else if (addr == (addr_t) &dummy32->bits)
524 /* Single-step bit. */
525 return (__u32) test_thread_flag(TIF_SINGLE_STEP) ?
527 else if (addr == (addr_t) &dummy32->starting_addr)
528 /* Start address of the user specified per set. */
529 return (__u32) child->thread.per_user.start;
530 else if (addr == (addr_t) &dummy32->ending_addr)
531 /* End address of the user specified per set. */
532 return (__u32) child->thread.per_user.end;
533 else if (addr == (addr_t) &dummy32->perc_atmid)
534 /* PER code, ATMID and AI of the last PER trap */
535 return (__u32) child->thread.per_event.cause << 16;
536 else if (addr == (addr_t) &dummy32->address)
537 /* Address of the last PER trap */
538 return (__u32) child->thread.per_event.address;
539 else if (addr == (addr_t) &dummy32->access_id)
540 /* Access id of the last PER trap */
541 return (__u32) child->thread.per_event.paid << 24;
546 * Same as peek_user but for a 31 bit program.
548 static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
550 struct compat_user *dummy32 = NULL;
554 if (addr < (addr_t) &dummy32->regs.acrs) {
555 struct pt_regs *regs = task_pt_regs(child);
557 * psw and gprs are stored on the stack
559 if (addr == (addr_t) &dummy32->regs.psw.mask) {
560 /* Fake a 31 bit psw mask. */
561 tmp = (__u32)(regs->psw.mask >> 32);
562 tmp &= PSW32_MASK_USER | PSW32_MASK_RI;
563 tmp |= PSW32_USER_BITS;
564 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
565 /* Fake a 31 bit psw address. */
566 tmp = (__u32) regs->psw.addr |
567 (__u32)(regs->psw.mask & PSW_MASK_BA);
570 tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4);
572 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
574 * access registers are stored in the thread structure
576 offset = addr - (addr_t) &dummy32->regs.acrs;
577 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
579 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
581 * orig_gpr2 is stored on the kernel stack
583 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
585 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
587 * prevent reads of padding hole between
588 * orig_gpr2 and fp_regs on s390.
592 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
594 * floating point regs. are stored in the thread structure
596 offset = addr - (addr_t) &dummy32->regs.fp_regs;
597 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
599 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
601 * Handle access to the per_info structure.
603 addr -= (addr_t) &dummy32->regs.per_info;
604 tmp = __peek_user_per_compat(child, addr);
612 static int peek_user_compat(struct task_struct *child,
613 addr_t addr, addr_t data)
617 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
620 tmp = __peek_user_compat(child, addr);
621 return put_user(tmp, (__u32 __user *) data);
625 * Same as poke_user_per but for a 31 bit program.
627 static inline void __poke_user_per_compat(struct task_struct *child,
628 addr_t addr, __u32 data)
630 struct compat_per_struct_kernel *dummy32 = NULL;
632 if (addr == (addr_t) &dummy32->cr9)
633 /* PER event mask of the user specified per set. */
634 child->thread.per_user.control =
635 data & (PER_EVENT_MASK | PER_CONTROL_MASK);
636 else if (addr == (addr_t) &dummy32->starting_addr)
637 /* Starting address of the user specified per set. */
638 child->thread.per_user.start = data;
639 else if (addr == (addr_t) &dummy32->ending_addr)
640 /* Ending address of the user specified per set. */
641 child->thread.per_user.end = data;
645 * Same as poke_user but for a 31 bit program.
647 static int __poke_user_compat(struct task_struct *child,
648 addr_t addr, addr_t data)
650 struct compat_user *dummy32 = NULL;
651 __u32 tmp = (__u32) data;
654 if (addr < (addr_t) &dummy32->regs.acrs) {
655 struct pt_regs *regs = task_pt_regs(child);
657 * psw, gprs, acrs and orig_gpr2 are stored on the stack
659 if (addr == (addr_t) &dummy32->regs.psw.mask) {
660 __u32 mask = PSW32_MASK_USER;
662 mask |= is_ri_task(child) ? PSW32_MASK_RI : 0;
663 /* Build a 64 bit psw mask from 31 bit mask. */
664 if ((tmp & ~mask) != PSW32_USER_BITS)
665 /* Invalid psw mask. */
667 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
668 (regs->psw.mask & PSW_MASK_BA) |
669 (__u64)(tmp & mask) << 32;
670 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
671 /* Build a 64 bit psw address from 31 bit address. */
672 regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN;
673 /* Transfer 31 bit amode bit to psw mask. */
674 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) |
675 (__u64)(tmp & PSW32_ADDR_AMODE);
678 *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp;
680 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
682 * access registers are stored in the thread structure
684 offset = addr - (addr_t) &dummy32->regs.acrs;
685 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
687 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
689 * orig_gpr2 is stored on the kernel stack
691 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
693 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
695 * prevent writess of padding hole between
696 * orig_gpr2 and fp_regs on s390.
700 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
702 * floating point regs. are stored in the thread structure
704 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
707 offset = addr - (addr_t) &dummy32->regs.fp_regs;
708 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
710 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
712 * Handle access to the per_info structure.
714 addr -= (addr_t) &dummy32->regs.per_info;
715 __poke_user_per_compat(child, addr, data);
721 static int poke_user_compat(struct task_struct *child,
722 addr_t addr, addr_t data)
724 if (!is_compat_task() || (addr & 3) ||
725 addr > sizeof(struct compat_user) - 3)
728 return __poke_user_compat(child, addr, data);
731 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
732 compat_ulong_t caddr, compat_ulong_t cdata)
734 unsigned long addr = caddr;
735 unsigned long data = cdata;
736 compat_ptrace_area parea;
741 /* read the word at location addr in the USER area. */
742 return peek_user_compat(child, addr, data);
745 /* write the word at location addr in the USER area */
746 return poke_user_compat(child, addr, data);
748 case PTRACE_PEEKUSR_AREA:
749 case PTRACE_POKEUSR_AREA:
750 if (copy_from_user(&parea, (void __force __user *) addr,
753 addr = parea.kernel_addr;
754 data = parea.process_addr;
756 while (copied < parea.len) {
757 if (request == PTRACE_PEEKUSR_AREA)
758 ret = peek_user_compat(child, addr, data);
762 (__u32 __force __user *) data))
764 ret = poke_user_compat(child, addr, utmp);
768 addr += sizeof(unsigned int);
769 data += sizeof(unsigned int);
770 copied += sizeof(unsigned int);
773 case PTRACE_GET_LAST_BREAK:
774 put_user(task_thread_info(child)->last_break,
775 (unsigned int __user *) data);
778 return compat_ptrace_request(child, request, addr, data);
782 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
786 /* Do the secure computing check first. */
787 if (secure_computing(regs->gprs[2])) {
788 /* seccomp failures shouldn't expose any additional code. */
794 * The sysc_tracesys code in entry.S stored the system
795 * call number to gprs[2].
797 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
798 (tracehook_report_syscall_entry(regs) ||
799 regs->gprs[2] >= NR_syscalls)) {
801 * Tracing decided this syscall should not happen or the
802 * debugger stored an invalid system call number. Skip
803 * the system call and the system call restart handling.
805 clear_thread_flag(TIF_SYSCALL);
809 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
810 trace_sys_enter(regs, regs->gprs[2]);
812 audit_syscall_entry(is_compat_task() ?
813 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
814 regs->gprs[2], regs->orig_gpr2,
815 regs->gprs[3], regs->gprs[4],
818 return ret ?: regs->gprs[2];
821 asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
823 audit_syscall_exit(regs);
825 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
826 trace_sys_exit(regs, regs->gprs[2]);
828 if (test_thread_flag(TIF_SYSCALL_TRACE))
829 tracehook_report_syscall_exit(regs, 0);
833 * user_regset definitions.
836 static int s390_regs_get(struct task_struct *target,
837 const struct user_regset *regset,
838 unsigned int pos, unsigned int count,
839 void *kbuf, void __user *ubuf)
841 if (target == current)
842 save_access_regs(target->thread.acrs);
845 unsigned long *k = kbuf;
847 *k++ = __peek_user(target, pos);
852 unsigned long __user *u = ubuf;
854 if (__put_user(__peek_user(target, pos), u++))
863 static int s390_regs_set(struct task_struct *target,
864 const struct user_regset *regset,
865 unsigned int pos, unsigned int count,
866 const void *kbuf, const void __user *ubuf)
870 if (target == current)
871 save_access_regs(target->thread.acrs);
874 const unsigned long *k = kbuf;
875 while (count > 0 && !rc) {
876 rc = __poke_user(target, pos, *k++);
881 const unsigned long __user *u = ubuf;
882 while (count > 0 && !rc) {
884 rc = __get_user(word, u++);
887 rc = __poke_user(target, pos, word);
893 if (rc == 0 && target == current)
894 restore_access_regs(target->thread.acrs);
899 static int s390_fpregs_get(struct task_struct *target,
900 const struct user_regset *regset, unsigned int pos,
901 unsigned int count, void *kbuf, void __user *ubuf)
903 if (target == current) {
904 save_fp_ctl(&target->thread.fp_regs.fpc);
905 save_fp_regs(target->thread.fp_regs.fprs);
908 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
909 &target->thread.fp_regs, 0, -1);
912 static int s390_fpregs_set(struct task_struct *target,
913 const struct user_regset *regset, unsigned int pos,
914 unsigned int count, const void *kbuf,
915 const void __user *ubuf)
919 if (target == current) {
920 save_fp_ctl(&target->thread.fp_regs.fpc);
921 save_fp_regs(target->thread.fp_regs.fprs);
924 /* If setting FPC, must validate it first. */
925 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
926 u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 };
927 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
928 0, offsetof(s390_fp_regs, fprs));
931 if (ufpc[1] != 0 || test_fp_ctl(ufpc[0]))
933 target->thread.fp_regs.fpc = ufpc[0];
936 if (rc == 0 && count > 0)
937 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
938 target->thread.fp_regs.fprs,
939 offsetof(s390_fp_regs, fprs), -1);
941 if (rc == 0 && target == current) {
942 restore_fp_ctl(&target->thread.fp_regs.fpc);
943 restore_fp_regs(target->thread.fp_regs.fprs);
951 static int s390_last_break_get(struct task_struct *target,
952 const struct user_regset *regset,
953 unsigned int pos, unsigned int count,
954 void *kbuf, void __user *ubuf)
958 unsigned long *k = kbuf;
959 *k = task_thread_info(target)->last_break;
961 unsigned long __user *u = ubuf;
962 if (__put_user(task_thread_info(target)->last_break, u))
969 static int s390_last_break_set(struct task_struct *target,
970 const struct user_regset *regset,
971 unsigned int pos, unsigned int count,
972 const void *kbuf, const void __user *ubuf)
977 static int s390_tdb_get(struct task_struct *target,
978 const struct user_regset *regset,
979 unsigned int pos, unsigned int count,
980 void *kbuf, void __user *ubuf)
982 struct pt_regs *regs = task_pt_regs(target);
985 if (!(regs->int_code & 0x200))
987 data = target->thread.trap_tdb;
988 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256);
991 static int s390_tdb_set(struct task_struct *target,
992 const struct user_regset *regset,
993 unsigned int pos, unsigned int count,
994 const void *kbuf, const void __user *ubuf)
1001 static int s390_system_call_get(struct task_struct *target,
1002 const struct user_regset *regset,
1003 unsigned int pos, unsigned int count,
1004 void *kbuf, void __user *ubuf)
1006 unsigned int *data = &task_thread_info(target)->system_call;
1007 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
1008 data, 0, sizeof(unsigned int));
1011 static int s390_system_call_set(struct task_struct *target,
1012 const struct user_regset *regset,
1013 unsigned int pos, unsigned int count,
1014 const void *kbuf, const void __user *ubuf)
1016 unsigned int *data = &task_thread_info(target)->system_call;
1017 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
1018 data, 0, sizeof(unsigned int));
1021 static const struct user_regset s390_regsets[] = {
1022 [REGSET_GENERAL] = {
1023 .core_note_type = NT_PRSTATUS,
1024 .n = sizeof(s390_regs) / sizeof(long),
1025 .size = sizeof(long),
1026 .align = sizeof(long),
1027 .get = s390_regs_get,
1028 .set = s390_regs_set,
1031 .core_note_type = NT_PRFPREG,
1032 .n = sizeof(s390_fp_regs) / sizeof(long),
1033 .size = sizeof(long),
1034 .align = sizeof(long),
1035 .get = s390_fpregs_get,
1036 .set = s390_fpregs_set,
1039 [REGSET_LAST_BREAK] = {
1040 .core_note_type = NT_S390_LAST_BREAK,
1042 .size = sizeof(long),
1043 .align = sizeof(long),
1044 .get = s390_last_break_get,
1045 .set = s390_last_break_set,
1048 .core_note_type = NT_S390_TDB,
1052 .get = s390_tdb_get,
1053 .set = s390_tdb_set,
1056 [REGSET_SYSTEM_CALL] = {
1057 .core_note_type = NT_S390_SYSTEM_CALL,
1059 .size = sizeof(unsigned int),
1060 .align = sizeof(unsigned int),
1061 .get = s390_system_call_get,
1062 .set = s390_system_call_set,
1066 static const struct user_regset_view user_s390_view = {
1067 .name = UTS_MACHINE,
1068 .e_machine = EM_S390,
1069 .regsets = s390_regsets,
1070 .n = ARRAY_SIZE(s390_regsets)
1073 #ifdef CONFIG_COMPAT
1074 static int s390_compat_regs_get(struct task_struct *target,
1075 const struct user_regset *regset,
1076 unsigned int pos, unsigned int count,
1077 void *kbuf, void __user *ubuf)
1079 if (target == current)
1080 save_access_regs(target->thread.acrs);
1083 compat_ulong_t *k = kbuf;
1085 *k++ = __peek_user_compat(target, pos);
1086 count -= sizeof(*k);
1090 compat_ulong_t __user *u = ubuf;
1092 if (__put_user(__peek_user_compat(target, pos), u++))
1094 count -= sizeof(*u);
1101 static int s390_compat_regs_set(struct task_struct *target,
1102 const struct user_regset *regset,
1103 unsigned int pos, unsigned int count,
1104 const void *kbuf, const void __user *ubuf)
1108 if (target == current)
1109 save_access_regs(target->thread.acrs);
1112 const compat_ulong_t *k = kbuf;
1113 while (count > 0 && !rc) {
1114 rc = __poke_user_compat(target, pos, *k++);
1115 count -= sizeof(*k);
1119 const compat_ulong_t __user *u = ubuf;
1120 while (count > 0 && !rc) {
1121 compat_ulong_t word;
1122 rc = __get_user(word, u++);
1125 rc = __poke_user_compat(target, pos, word);
1126 count -= sizeof(*u);
1131 if (rc == 0 && target == current)
1132 restore_access_regs(target->thread.acrs);
1137 static int s390_compat_regs_high_get(struct task_struct *target,
1138 const struct user_regset *regset,
1139 unsigned int pos, unsigned int count,
1140 void *kbuf, void __user *ubuf)
1142 compat_ulong_t *gprs_high;
1144 gprs_high = (compat_ulong_t *)
1145 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1147 compat_ulong_t *k = kbuf;
1151 count -= sizeof(*k);
1154 compat_ulong_t __user *u = ubuf;
1156 if (__put_user(*gprs_high, u++))
1159 count -= sizeof(*u);
1165 static int s390_compat_regs_high_set(struct task_struct *target,
1166 const struct user_regset *regset,
1167 unsigned int pos, unsigned int count,
1168 const void *kbuf, const void __user *ubuf)
1170 compat_ulong_t *gprs_high;
1173 gprs_high = (compat_ulong_t *)
1174 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
1176 const compat_ulong_t *k = kbuf;
1180 count -= sizeof(*k);
1183 const compat_ulong_t __user *u = ubuf;
1184 while (count > 0 && !rc) {
1186 rc = __get_user(word, u++);
1191 count -= sizeof(*u);
1198 static int s390_compat_last_break_get(struct task_struct *target,
1199 const struct user_regset *regset,
1200 unsigned int pos, unsigned int count,
1201 void *kbuf, void __user *ubuf)
1203 compat_ulong_t last_break;
1206 last_break = task_thread_info(target)->last_break;
1208 unsigned long *k = kbuf;
1211 unsigned long __user *u = ubuf;
1212 if (__put_user(last_break, u))
1219 static int s390_compat_last_break_set(struct task_struct *target,
1220 const struct user_regset *regset,
1221 unsigned int pos, unsigned int count,
1222 const void *kbuf, const void __user *ubuf)
1227 static const struct user_regset s390_compat_regsets[] = {
1228 [REGSET_GENERAL] = {
1229 .core_note_type = NT_PRSTATUS,
1230 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
1231 .size = sizeof(compat_long_t),
1232 .align = sizeof(compat_long_t),
1233 .get = s390_compat_regs_get,
1234 .set = s390_compat_regs_set,
1237 .core_note_type = NT_PRFPREG,
1238 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
1239 .size = sizeof(compat_long_t),
1240 .align = sizeof(compat_long_t),
1241 .get = s390_fpregs_get,
1242 .set = s390_fpregs_set,
1244 [REGSET_LAST_BREAK] = {
1245 .core_note_type = NT_S390_LAST_BREAK,
1247 .size = sizeof(long),
1248 .align = sizeof(long),
1249 .get = s390_compat_last_break_get,
1250 .set = s390_compat_last_break_set,
1253 .core_note_type = NT_S390_TDB,
1257 .get = s390_tdb_get,
1258 .set = s390_tdb_set,
1260 [REGSET_SYSTEM_CALL] = {
1261 .core_note_type = NT_S390_SYSTEM_CALL,
1263 .size = sizeof(compat_uint_t),
1264 .align = sizeof(compat_uint_t),
1265 .get = s390_system_call_get,
1266 .set = s390_system_call_set,
1268 [REGSET_GENERAL_EXTENDED] = {
1269 .core_note_type = NT_S390_HIGH_GPRS,
1270 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
1271 .size = sizeof(compat_long_t),
1272 .align = sizeof(compat_long_t),
1273 .get = s390_compat_regs_high_get,
1274 .set = s390_compat_regs_high_set,
1278 static const struct user_regset_view user_s390_compat_view = {
1280 .e_machine = EM_S390,
1281 .regsets = s390_compat_regsets,
1282 .n = ARRAY_SIZE(s390_compat_regsets)
1286 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1288 #ifdef CONFIG_COMPAT
1289 if (test_tsk_thread_flag(task, TIF_31BIT))
1290 return &user_s390_compat_view;
1292 return &user_s390_view;
1295 static const char *gpr_names[NUM_GPRS] = {
1296 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
1297 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
1300 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset)
1302 if (offset >= NUM_GPRS)
1304 return regs->gprs[offset];
1307 int regs_query_register_offset(const char *name)
1309 unsigned long offset;
1311 if (!name || *name != 'r')
1313 if (kstrtoul(name + 1, 10, &offset))
1315 if (offset >= NUM_GPRS)
1320 const char *regs_query_register_name(unsigned int offset)
1322 if (offset >= NUM_GPRS)
1324 return gpr_names[offset];
1327 static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
1329 unsigned long ksp = kernel_stack_pointer(regs);
1331 return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1));
1335 * regs_get_kernel_stack_nth() - get Nth entry of the stack
1336 * @regs:pt_regs which contains kernel stack pointer.
1337 * @n:stack entry number.
1339 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
1340 * is specifined by @regs. If the @n th entry is NOT in the kernel stack,
1343 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
1347 addr = kernel_stack_pointer(regs) + n * sizeof(long);
1348 if (!regs_within_kernel_stack(regs, addr))
1350 return *(unsigned long *)addr;