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Commit | Line | Data |
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1da177e4 | 1 | /* |
5e9a2692 | 2 | * Ptrace user space interface. |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2010 |
5e9a2692 | 5 | * Author(s): Denis Joseph Barrow |
1da177e4 | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
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> | |
7ed20e1a | 18 | #include <linux/signal.h> |
63506c41 MS |
19 | #include <linux/elf.h> |
20 | #include <linux/regset.h> | |
753c4dd6 | 21 | #include <linux/tracehook.h> |
bcf5cef7 | 22 | #include <linux/seccomp.h> |
048cd4e5 | 23 | #include <linux/compat.h> |
9bf1226b | 24 | #include <trace/syscall.h> |
1da177e4 LT |
25 | #include <asm/segment.h> |
26 | #include <asm/page.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/pgalloc.h> | |
1da177e4 | 29 | #include <asm/uaccess.h> |
778959db | 30 | #include <asm/unistd.h> |
a0616cde | 31 | #include <asm/switch_to.h> |
a806170e | 32 | #include "entry.h" |
1da177e4 | 33 | |
347a8dc3 | 34 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
35 | #include "compat_ptrace.h" |
36 | #endif | |
37 | ||
1c569f02 JS |
38 | #define CREATE_TRACE_POINTS |
39 | #include <trace/events/syscalls.h> | |
5e9ad7df | 40 | |
63506c41 MS |
41 | enum s390_regset { |
42 | REGSET_GENERAL, | |
43 | REGSET_FP, | |
86f2552b | 44 | REGSET_LAST_BREAK, |
d35339a4 | 45 | REGSET_TDB, |
20b40a79 | 46 | REGSET_SYSTEM_CALL, |
ea2a4d3a | 47 | REGSET_GENERAL_EXTENDED, |
63506c41 MS |
48 | }; |
49 | ||
64597f9d | 50 | void update_cr_regs(struct task_struct *task) |
1da177e4 | 51 | { |
5e9a2692 MS |
52 | struct pt_regs *regs = task_pt_regs(task); |
53 | struct thread_struct *thread = &task->thread; | |
a45aff52 | 54 | struct per_regs old, new; |
5e9a2692 | 55 | |
66389e85 | 56 | #ifdef CONFIG_64BIT |
d35339a4 MS |
57 | /* Take care of the enable/disable of transactional execution. */ |
58 | if (MACHINE_HAS_TE) { | |
c63badeb | 59 | unsigned long cr, cr_new; |
d35339a4 | 60 | |
c63badeb | 61 | __ctl_store(cr, 0, 0); |
0628a5fb | 62 | /* Set or clear transaction execution TXC bit 8. */ |
c63badeb | 63 | cr_new = cr | (1UL << 55); |
d35339a4 | 64 | if (task->thread.per_flags & PER_FLAG_NO_TE) |
c63badeb MS |
65 | cr_new &= ~(1UL << 55); |
66 | if (cr_new != cr) | |
a8a934e4 | 67 | __ctl_load(cr_new, 0, 0); |
64597f9d | 68 | /* Set or clear transaction execution TDC bits 62 and 63. */ |
c63badeb MS |
69 | __ctl_store(cr, 2, 2); |
70 | cr_new = cr & ~3UL; | |
64597f9d MM |
71 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { |
72 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) | |
c63badeb | 73 | cr_new |= 1UL; |
64597f9d | 74 | else |
c63badeb | 75 | cr_new |= 2UL; |
64597f9d | 76 | } |
c63badeb MS |
77 | if (cr_new != cr) |
78 | __ctl_load(cr_new, 2, 2); | |
d35339a4 | 79 | } |
66389e85 | 80 | #endif |
a45aff52 MS |
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; | |
85 | ||
86 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
87 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { | |
818a330c MS |
88 | if (test_tsk_thread_flag(task, TIF_BLOCK_STEP)) |
89 | new.control |= PER_EVENT_BRANCH; | |
90 | else | |
91 | new.control |= PER_EVENT_IFETCH; | |
d35339a4 MS |
92 | #ifdef CONFIG_64BIT |
93 | new.control |= PER_CONTROL_SUSPENSION; | |
94 | new.control |= PER_EVENT_TRANSACTION_END; | |
95 | #endif | |
a45aff52 MS |
96 | new.start = 0; |
97 | new.end = PSW_ADDR_INSN; | |
98 | } | |
5e9a2692 MS |
99 | |
100 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 101 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 102 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 103 | return; |
c3311c13 | 104 | } |
5e9a2692 MS |
105 | regs->psw.mask |= PSW_MASK_PER; |
106 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
107 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
108 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
109 | } |
110 | ||
0ac30be4 | 111 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 112 | { |
818a330c | 113 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 114 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
115 | } |
116 | ||
0ac30be4 | 117 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 118 | { |
818a330c | 119 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 120 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
121 | } |
122 | ||
818a330c MS |
123 | void user_enable_block_step(struct task_struct *task) |
124 | { | |
125 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
126 | set_tsk_thread_flag(task, TIF_BLOCK_STEP); | |
127 | } | |
128 | ||
1da177e4 LT |
129 | /* |
130 | * Called by kernel/ptrace.c when detaching.. | |
131 | * | |
5e9a2692 | 132 | * Clear all debugging related fields. |
1da177e4 | 133 | */ |
5e9a2692 | 134 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 135 | { |
5e9a2692 MS |
136 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
137 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
138 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
139 | clear_tsk_thread_flag(task, TIF_PER_TRAP); | |
d35339a4 | 140 | task->thread.per_flags = 0; |
1da177e4 LT |
141 | } |
142 | ||
347a8dc3 | 143 | #ifndef CONFIG_64BIT |
1da177e4 LT |
144 | # define __ADDR_MASK 3 |
145 | #else | |
146 | # define __ADDR_MASK 7 | |
147 | #endif | |
148 | ||
5e9a2692 MS |
149 | static inline unsigned long __peek_user_per(struct task_struct *child, |
150 | addr_t addr) | |
151 | { | |
152 | struct per_struct_kernel *dummy = NULL; | |
153 | ||
154 | if (addr == (addr_t) &dummy->cr9) | |
155 | /* Control bits of the active per set. */ | |
156 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
157 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
158 | else if (addr == (addr_t) &dummy->cr10) | |
159 | /* Start address of the active per set. */ | |
160 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
161 | 0 : child->thread.per_user.start; | |
162 | else if (addr == (addr_t) &dummy->cr11) | |
163 | /* End address of the active per set. */ | |
164 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
165 | PSW_ADDR_INSN : child->thread.per_user.end; | |
166 | else if (addr == (addr_t) &dummy->bits) | |
167 | /* Single-step bit. */ | |
168 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
169 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
170 | else if (addr == (addr_t) &dummy->starting_addr) | |
171 | /* Start address of the user specified per set. */ | |
172 | return child->thread.per_user.start; | |
173 | else if (addr == (addr_t) &dummy->ending_addr) | |
174 | /* End address of the user specified per set. */ | |
175 | return child->thread.per_user.end; | |
176 | else if (addr == (addr_t) &dummy->perc_atmid) | |
177 | /* PER code, ATMID and AI of the last PER trap */ | |
178 | return (unsigned long) | |
179 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
180 | else if (addr == (addr_t) &dummy->address) | |
181 | /* Address of the last PER trap */ | |
182 | return child->thread.per_event.address; | |
183 | else if (addr == (addr_t) &dummy->access_id) | |
184 | /* Access id of the last PER trap */ | |
185 | return (unsigned long) | |
186 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
187 | return 0; | |
188 | } | |
189 | ||
1da177e4 LT |
190 | /* |
191 | * Read the word at offset addr from the user area of a process. The | |
192 | * trouble here is that the information is littered over different | |
193 | * locations. The process registers are found on the kernel stack, | |
194 | * the floating point stuff and the trace settings are stored in | |
195 | * the task structure. In addition the different structures in | |
196 | * struct user contain pad bytes that should be read as zeroes. | |
197 | * Lovely... | |
198 | */ | |
63506c41 | 199 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
200 | { |
201 | struct user *dummy = NULL; | |
63506c41 | 202 | addr_t offset, tmp; |
1da177e4 LT |
203 | |
204 | if (addr < (addr_t) &dummy->regs.acrs) { | |
205 | /* | |
206 | * psw and gprs are stored on the stack | |
207 | */ | |
c7584fb6 | 208 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
5ebf250d | 209 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
b50511e4 | 210 | /* Return a clean psw mask. */ |
5ebf250d HC |
211 | tmp &= PSW_MASK_USER | PSW_MASK_RI; |
212 | tmp |= PSW_USER_BITS; | |
213 | } | |
1da177e4 LT |
214 | |
215 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
216 | /* | |
217 | * access registers are stored in the thread structure | |
218 | */ | |
219 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 220 | #ifdef CONFIG_64BIT |
778959db MS |
221 | /* |
222 | * Very special case: old & broken 64 bit gdb reading | |
223 | * from acrs[15]. Result is a 64 bit value. Read the | |
224 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
225 | */ | |
226 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
227 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
228 | else | |
229 | #endif | |
1da177e4 LT |
230 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
231 | ||
232 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
233 | /* | |
234 | * orig_gpr2 is stored on the kernel stack | |
235 | */ | |
c7584fb6 | 236 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 237 | |
3d6e48f4 JW |
238 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
239 | /* | |
240 | * prevent reads of padding hole between | |
241 | * orig_gpr2 and fp_regs on s390. | |
242 | */ | |
243 | tmp = 0; | |
244 | ||
1da177e4 LT |
245 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
246 | /* | |
247 | * floating point regs. are stored in the thread structure | |
248 | */ | |
249 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
250 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db | 251 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
4725c860 | 252 | tmp <<= BITS_PER_LONG - 32; |
1da177e4 LT |
253 | |
254 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
255 | /* | |
5e9a2692 | 256 | * Handle access to the per_info structure. |
1da177e4 | 257 | */ |
5e9a2692 MS |
258 | addr -= (addr_t) &dummy->regs.per_info; |
259 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
260 | |
261 | } else | |
262 | tmp = 0; | |
263 | ||
63506c41 | 264 | return tmp; |
1da177e4 LT |
265 | } |
266 | ||
1da177e4 | 267 | static int |
63506c41 | 268 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 269 | { |
63506c41 | 270 | addr_t tmp, mask; |
1da177e4 LT |
271 | |
272 | /* | |
273 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 274 | * an alignment of 4. Programmers from hell... |
1da177e4 | 275 | */ |
778959db | 276 | mask = __ADDR_MASK; |
347a8dc3 | 277 | #ifdef CONFIG_64BIT |
547e3cec MS |
278 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
279 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
280 | mask = 3; |
281 | #endif | |
282 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
283 | return -EIO; |
284 | ||
63506c41 MS |
285 | tmp = __peek_user(child, addr); |
286 | return put_user(tmp, (addr_t __user *) data); | |
287 | } | |
288 | ||
5e9a2692 MS |
289 | static inline void __poke_user_per(struct task_struct *child, |
290 | addr_t addr, addr_t data) | |
291 | { | |
292 | struct per_struct_kernel *dummy = NULL; | |
293 | ||
294 | /* | |
295 | * There are only three fields in the per_info struct that the | |
296 | * debugger user can write to. | |
297 | * 1) cr9: the debugger wants to set a new PER event mask | |
298 | * 2) starting_addr: the debugger wants to set a new starting | |
299 | * address to use with the PER event mask. | |
300 | * 3) ending_addr: the debugger wants to set a new ending | |
301 | * address to use with the PER event mask. | |
302 | * The user specified PER event mask and the start and end | |
303 | * addresses are used only if single stepping is not in effect. | |
304 | * Writes to any other field in per_info are ignored. | |
305 | */ | |
306 | if (addr == (addr_t) &dummy->cr9) | |
307 | /* PER event mask of the user specified per set. */ | |
308 | child->thread.per_user.control = | |
309 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
310 | else if (addr == (addr_t) &dummy->starting_addr) | |
311 | /* Starting address of the user specified per set. */ | |
312 | child->thread.per_user.start = data; | |
313 | else if (addr == (addr_t) &dummy->ending_addr) | |
314 | /* Ending address of the user specified per set. */ | |
315 | child->thread.per_user.end = data; | |
316 | } | |
317 | ||
63506c41 MS |
318 | /* |
319 | * Write a word to the user area of a process at location addr. This | |
320 | * operation does have an additional problem compared to peek_user. | |
321 | * Stores to the program status word and on the floating point | |
322 | * control register needs to get checked for validity. | |
323 | */ | |
324 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
325 | { | |
326 | struct user *dummy = NULL; | |
d4e81b35 | 327 | addr_t offset; |
63506c41 | 328 | |
1da177e4 LT |
329 | if (addr < (addr_t) &dummy->regs.acrs) { |
330 | /* | |
331 | * psw and gprs are stored on the stack | |
332 | */ | |
5ebf250d HC |
333 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
334 | unsigned long mask = PSW_MASK_USER; | |
335 | ||
336 | mask |= is_ri_task(child) ? PSW_MASK_RI : 0; | |
337 | if ((data & ~mask) != PSW_USER_BITS) | |
338 | return -EINVAL; | |
339 | if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)) | |
340 | return -EINVAL; | |
341 | } | |
c7584fb6 | 342 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
343 | |
344 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
345 | /* | |
346 | * access registers are stored in the thread structure | |
347 | */ | |
348 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 349 | #ifdef CONFIG_64BIT |
778959db MS |
350 | /* |
351 | * Very special case: old & broken 64 bit gdb writing | |
352 | * to acrs[15] with a 64 bit value. Ignore the lower | |
353 | * half of the value and write the upper 32 bit to | |
354 | * acrs[15]. Sick... | |
355 | */ | |
356 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
357 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
358 | else | |
359 | #endif | |
1da177e4 LT |
360 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
361 | ||
362 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
363 | /* | |
364 | * orig_gpr2 is stored on the kernel stack | |
365 | */ | |
c7584fb6 | 366 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 367 | |
3d6e48f4 JW |
368 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
369 | /* | |
370 | * prevent writes of padding hole between | |
371 | * orig_gpr2 and fp_regs on s390. | |
372 | */ | |
373 | return 0; | |
374 | ||
1da177e4 LT |
375 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
376 | /* | |
377 | * floating point regs. are stored in the thread structure | |
378 | */ | |
4725c860 MS |
379 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
380 | if ((unsigned int) data != 0 || | |
381 | test_fp_ctl(data >> (BITS_PER_LONG - 32))) | |
382 | return -EINVAL; | |
1da177e4 LT |
383 | offset = addr - (addr_t) &dummy->regs.fp_regs; |
384 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
385 | ||
386 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
387 | /* | |
5e9a2692 | 388 | * Handle access to the per_info structure. |
1da177e4 | 389 | */ |
5e9a2692 MS |
390 | addr -= (addr_t) &dummy->regs.per_info; |
391 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
392 | |
393 | } | |
394 | ||
1da177e4 LT |
395 | return 0; |
396 | } | |
397 | ||
5e9a2692 | 398 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 399 | { |
63506c41 MS |
400 | addr_t mask; |
401 | ||
402 | /* | |
403 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
404 | * an alignment of 4. Programmers from hell indeed... | |
405 | */ | |
406 | mask = __ADDR_MASK; | |
407 | #ifdef CONFIG_64BIT | |
547e3cec MS |
408 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
409 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
410 | mask = 3; |
411 | #endif | |
412 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
413 | return -EIO; | |
414 | ||
415 | return __poke_user(child, addr, data); | |
416 | } | |
417 | ||
9b05a69e NK |
418 | long arch_ptrace(struct task_struct *child, long request, |
419 | unsigned long addr, unsigned long data) | |
1da177e4 | 420 | { |
1da177e4 LT |
421 | ptrace_area parea; |
422 | int copied, ret; | |
423 | ||
424 | switch (request) { | |
1da177e4 LT |
425 | case PTRACE_PEEKUSR: |
426 | /* read the word at location addr in the USER area. */ | |
427 | return peek_user(child, addr, data); | |
428 | ||
1da177e4 LT |
429 | case PTRACE_POKEUSR: |
430 | /* write the word at location addr in the USER area */ | |
431 | return poke_user(child, addr, data); | |
432 | ||
433 | case PTRACE_PEEKUSR_AREA: | |
434 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 435 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
436 | sizeof(parea))) |
437 | return -EFAULT; | |
438 | addr = parea.kernel_addr; | |
439 | data = parea.process_addr; | |
440 | copied = 0; | |
441 | while (copied < parea.len) { | |
442 | if (request == PTRACE_PEEKUSR_AREA) | |
443 | ret = peek_user(child, addr, data); | |
444 | else { | |
2b67fc46 HC |
445 | addr_t utmp; |
446 | if (get_user(utmp, | |
447 | (addr_t __force __user *) data)) | |
1da177e4 | 448 | return -EFAULT; |
2b67fc46 | 449 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
450 | } |
451 | if (ret) | |
452 | return ret; | |
453 | addr += sizeof(unsigned long); | |
454 | data += sizeof(unsigned long); | |
455 | copied += sizeof(unsigned long); | |
456 | } | |
457 | return 0; | |
86f2552b MS |
458 | case PTRACE_GET_LAST_BREAK: |
459 | put_user(task_thread_info(child)->last_break, | |
460 | (unsigned long __user *) data); | |
461 | return 0; | |
d35339a4 MS |
462 | case PTRACE_ENABLE_TE: |
463 | if (!MACHINE_HAS_TE) | |
464 | return -EIO; | |
465 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
466 | return 0; | |
467 | case PTRACE_DISABLE_TE: | |
468 | if (!MACHINE_HAS_TE) | |
469 | return -EIO; | |
470 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
64597f9d MM |
471 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; |
472 | return 0; | |
473 | case PTRACE_TE_ABORT_RAND: | |
474 | if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) | |
475 | return -EIO; | |
476 | switch (data) { | |
477 | case 0UL: | |
478 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; | |
479 | break; | |
480 | case 1UL: | |
481 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
482 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; | |
483 | break; | |
484 | case 2UL: | |
485 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
486 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; | |
487 | break; | |
488 | default: | |
489 | return -EINVAL; | |
490 | } | |
d35339a4 | 491 | return 0; |
07805ac8 CB |
492 | default: |
493 | /* Removing high order bit from addr (only for 31 bit). */ | |
494 | addr &= PSW_ADDR_INSN; | |
495 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 496 | } |
1da177e4 LT |
497 | } |
498 | ||
347a8dc3 | 499 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
500 | /* |
501 | * Now the fun part starts... a 31 bit program running in the | |
502 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
503 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
504 | * to handle, the difference to the 64 bit versions of the requests | |
505 | * is that the access is done in multiples of 4 byte instead of | |
506 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
507 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
508 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
509 | * is a 31 bit program too, the content of struct user can be | |
510 | * emulated. A 31 bit program peeking into the struct user of | |
511 | * a 64 bit program is a no-no. | |
512 | */ | |
513 | ||
5e9a2692 MS |
514 | /* |
515 | * Same as peek_user_per but for a 31 bit program. | |
516 | */ | |
517 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
518 | addr_t addr) | |
519 | { | |
520 | struct compat_per_struct_kernel *dummy32 = NULL; | |
521 | ||
522 | if (addr == (addr_t) &dummy32->cr9) | |
523 | /* Control bits of the active per set. */ | |
524 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
525 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
526 | else if (addr == (addr_t) &dummy32->cr10) | |
527 | /* Start address of the active per set. */ | |
528 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
529 | 0 : child->thread.per_user.start; | |
530 | else if (addr == (addr_t) &dummy32->cr11) | |
531 | /* End address of the active per set. */ | |
532 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
533 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
534 | else if (addr == (addr_t) &dummy32->bits) | |
535 | /* Single-step bit. */ | |
536 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
537 | 0x80000000 : 0; | |
538 | else if (addr == (addr_t) &dummy32->starting_addr) | |
539 | /* Start address of the user specified per set. */ | |
540 | return (__u32) child->thread.per_user.start; | |
541 | else if (addr == (addr_t) &dummy32->ending_addr) | |
542 | /* End address of the user specified per set. */ | |
543 | return (__u32) child->thread.per_user.end; | |
544 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
545 | /* PER code, ATMID and AI of the last PER trap */ | |
546 | return (__u32) child->thread.per_event.cause << 16; | |
547 | else if (addr == (addr_t) &dummy32->address) | |
548 | /* Address of the last PER trap */ | |
549 | return (__u32) child->thread.per_event.address; | |
550 | else if (addr == (addr_t) &dummy32->access_id) | |
551 | /* Access id of the last PER trap */ | |
552 | return (__u32) child->thread.per_event.paid << 24; | |
553 | return 0; | |
554 | } | |
555 | ||
1da177e4 LT |
556 | /* |
557 | * Same as peek_user but for a 31 bit program. | |
558 | */ | |
63506c41 | 559 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 560 | { |
5e9a2692 | 561 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
562 | addr_t offset; |
563 | __u32 tmp; | |
564 | ||
1da177e4 | 565 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 566 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
567 | /* |
568 | * psw and gprs are stored on the stack | |
569 | */ | |
570 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
571 | /* Fake a 31 bit psw mask. */ | |
b50511e4 | 572 | tmp = (__u32)(regs->psw.mask >> 32); |
5ebf250d | 573 | tmp &= PSW32_MASK_USER | PSW32_MASK_RI; |
f26946d7 | 574 | tmp |= PSW32_USER_BITS; |
1da177e4 LT |
575 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
576 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
577 | tmp = (__u32) regs->psw.addr | |
578 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
579 | } else { |
580 | /* gpr 0-15 */ | |
b50511e4 | 581 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
582 | } |
583 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
584 | /* | |
585 | * access registers are stored in the thread structure | |
586 | */ | |
587 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
588 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
589 | ||
590 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
591 | /* | |
592 | * orig_gpr2 is stored on the kernel stack | |
593 | */ | |
c7584fb6 | 594 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 595 | |
3d6e48f4 JW |
596 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
597 | /* | |
598 | * prevent reads of padding hole between | |
599 | * orig_gpr2 and fp_regs on s390. | |
600 | */ | |
601 | tmp = 0; | |
602 | ||
1da177e4 LT |
603 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
604 | /* | |
605 | * floating point regs. are stored in the thread structure | |
606 | */ | |
607 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
608 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
609 | ||
610 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
611 | /* | |
5e9a2692 | 612 | * Handle access to the per_info structure. |
1da177e4 | 613 | */ |
5e9a2692 MS |
614 | addr -= (addr_t) &dummy32->regs.per_info; |
615 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
616 | |
617 | } else | |
618 | tmp = 0; | |
619 | ||
63506c41 MS |
620 | return tmp; |
621 | } | |
622 | ||
623 | static int peek_user_compat(struct task_struct *child, | |
624 | addr_t addr, addr_t data) | |
625 | { | |
626 | __u32 tmp; | |
627 | ||
7757591a | 628 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
629 | return -EIO; |
630 | ||
631 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
632 | return put_user(tmp, (__u32 __user *) data); |
633 | } | |
634 | ||
5e9a2692 MS |
635 | /* |
636 | * Same as poke_user_per but for a 31 bit program. | |
637 | */ | |
638 | static inline void __poke_user_per_compat(struct task_struct *child, | |
639 | addr_t addr, __u32 data) | |
640 | { | |
641 | struct compat_per_struct_kernel *dummy32 = NULL; | |
642 | ||
643 | if (addr == (addr_t) &dummy32->cr9) | |
644 | /* PER event mask of the user specified per set. */ | |
645 | child->thread.per_user.control = | |
646 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
647 | else if (addr == (addr_t) &dummy32->starting_addr) | |
648 | /* Starting address of the user specified per set. */ | |
649 | child->thread.per_user.start = data; | |
650 | else if (addr == (addr_t) &dummy32->ending_addr) | |
651 | /* Ending address of the user specified per set. */ | |
652 | child->thread.per_user.end = data; | |
653 | } | |
654 | ||
1da177e4 LT |
655 | /* |
656 | * Same as poke_user but for a 31 bit program. | |
657 | */ | |
63506c41 MS |
658 | static int __poke_user_compat(struct task_struct *child, |
659 | addr_t addr, addr_t data) | |
1da177e4 | 660 | { |
5e9a2692 | 661 | struct compat_user *dummy32 = NULL; |
63506c41 | 662 | __u32 tmp = (__u32) data; |
1da177e4 | 663 | addr_t offset; |
1da177e4 LT |
664 | |
665 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 666 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
667 | /* |
668 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
669 | */ | |
670 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
5ebf250d HC |
671 | __u32 mask = PSW32_MASK_USER; |
672 | ||
673 | mask |= is_ri_task(child) ? PSW32_MASK_RI : 0; | |
1da177e4 | 674 | /* Build a 64 bit psw mask from 31 bit mask. */ |
f26946d7 | 675 | if ((tmp & ~mask) != PSW32_USER_BITS) |
1da177e4 LT |
676 | /* Invalid psw mask. */ |
677 | return -EINVAL; | |
b50511e4 | 678 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 679 | (regs->psw.mask & PSW_MASK_BA) | |
5ebf250d | 680 | (__u64)(tmp & mask) << 32; |
1da177e4 LT |
681 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
682 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 683 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
684 | /* Transfer 31 bit amode bit to psw mask. */ |
685 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
686 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
687 | } else { |
688 | /* gpr 0-15 */ | |
b50511e4 | 689 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
690 | } |
691 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
692 | /* | |
693 | * access registers are stored in the thread structure | |
694 | */ | |
695 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
696 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
697 | ||
698 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
699 | /* | |
700 | * orig_gpr2 is stored on the kernel stack | |
701 | */ | |
c7584fb6 | 702 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 703 | |
3d6e48f4 JW |
704 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
705 | /* | |
706 | * prevent writess of padding hole between | |
707 | * orig_gpr2 and fp_regs on s390. | |
708 | */ | |
709 | return 0; | |
710 | ||
1da177e4 LT |
711 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
712 | /* | |
713 | * floating point regs. are stored in the thread structure | |
714 | */ | |
715 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
4725c860 | 716 | test_fp_ctl(tmp)) |
1da177e4 LT |
717 | return -EINVAL; |
718 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
719 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
720 | ||
721 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
722 | /* | |
5e9a2692 | 723 | * Handle access to the per_info structure. |
1da177e4 | 724 | */ |
5e9a2692 MS |
725 | addr -= (addr_t) &dummy32->regs.per_info; |
726 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
727 | } |
728 | ||
1da177e4 LT |
729 | return 0; |
730 | } | |
731 | ||
63506c41 MS |
732 | static int poke_user_compat(struct task_struct *child, |
733 | addr_t addr, addr_t data) | |
734 | { | |
5e9a2692 MS |
735 | if (!is_compat_task() || (addr & 3) || |
736 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
737 | return -EIO; |
738 | ||
739 | return __poke_user_compat(child, addr, data); | |
740 | } | |
741 | ||
b499d76b RM |
742 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
743 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 744 | { |
b499d76b RM |
745 | unsigned long addr = caddr; |
746 | unsigned long data = cdata; | |
5e9a2692 | 747 | compat_ptrace_area parea; |
1da177e4 LT |
748 | int copied, ret; |
749 | ||
750 | switch (request) { | |
1da177e4 LT |
751 | case PTRACE_PEEKUSR: |
752 | /* read the word at location addr in the USER area. */ | |
63506c41 | 753 | return peek_user_compat(child, addr, data); |
1da177e4 | 754 | |
1da177e4 LT |
755 | case PTRACE_POKEUSR: |
756 | /* write the word at location addr in the USER area */ | |
63506c41 | 757 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
758 | |
759 | case PTRACE_PEEKUSR_AREA: | |
760 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 761 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
762 | sizeof(parea))) |
763 | return -EFAULT; | |
764 | addr = parea.kernel_addr; | |
765 | data = parea.process_addr; | |
766 | copied = 0; | |
767 | while (copied < parea.len) { | |
768 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 769 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 770 | else { |
2b67fc46 HC |
771 | __u32 utmp; |
772 | if (get_user(utmp, | |
773 | (__u32 __force __user *) data)) | |
1da177e4 | 774 | return -EFAULT; |
63506c41 | 775 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
776 | } |
777 | if (ret) | |
778 | return ret; | |
779 | addr += sizeof(unsigned int); | |
780 | data += sizeof(unsigned int); | |
781 | copied += sizeof(unsigned int); | |
782 | } | |
783 | return 0; | |
86f2552b MS |
784 | case PTRACE_GET_LAST_BREAK: |
785 | put_user(task_thread_info(child)->last_break, | |
786 | (unsigned int __user *) data); | |
787 | return 0; | |
1da177e4 | 788 | } |
b499d76b | 789 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
790 | } |
791 | #endif | |
792 | ||
753c4dd6 | 793 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 794 | { |
545c174d | 795 | long ret = 0; |
1da177e4 | 796 | |
bcf5cef7 | 797 | /* Do the secure computing check first. */ |
c63cb468 HC |
798 | if (secure_computing(regs->gprs[2])) { |
799 | /* seccomp failures shouldn't expose any additional code. */ | |
800 | ret = -1; | |
801 | goto out; | |
802 | } | |
bcf5cef7 | 803 | |
c5c3a6d8 | 804 | /* |
753c4dd6 MS |
805 | * The sysc_tracesys code in entry.S stored the system |
806 | * call number to gprs[2]. | |
c5c3a6d8 | 807 | */ |
753c4dd6 MS |
808 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
809 | (tracehook_report_syscall_entry(regs) || | |
810 | regs->gprs[2] >= NR_syscalls)) { | |
811 | /* | |
812 | * Tracing decided this syscall should not happen or the | |
813 | * debugger stored an invalid system call number. Skip | |
814 | * the system call and the system call restart handling. | |
815 | */ | |
b6ef5bb3 | 816 | clear_thread_flag(TIF_SYSCALL); |
753c4dd6 | 817 | ret = -1; |
1da177e4 | 818 | } |
753c4dd6 | 819 | |
66700001 | 820 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 821 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 822 | |
b05d8447 EP |
823 | audit_syscall_entry(is_compat_task() ? |
824 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, | |
825 | regs->gprs[2], regs->orig_gpr2, | |
826 | regs->gprs[3], regs->gprs[4], | |
827 | regs->gprs[5]); | |
c63cb468 | 828 | out: |
545c174d | 829 | return ret ?: regs->gprs[2]; |
753c4dd6 MS |
830 | } |
831 | ||
832 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
833 | { | |
d7e7528b | 834 | audit_syscall_exit(regs); |
753c4dd6 | 835 | |
66700001 | 836 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 837 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 838 | |
753c4dd6 MS |
839 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
840 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 841 | } |
63506c41 MS |
842 | |
843 | /* | |
844 | * user_regset definitions. | |
845 | */ | |
846 | ||
847 | static int s390_regs_get(struct task_struct *target, | |
848 | const struct user_regset *regset, | |
849 | unsigned int pos, unsigned int count, | |
850 | void *kbuf, void __user *ubuf) | |
851 | { | |
852 | if (target == current) | |
853 | save_access_regs(target->thread.acrs); | |
854 | ||
855 | if (kbuf) { | |
856 | unsigned long *k = kbuf; | |
857 | while (count > 0) { | |
858 | *k++ = __peek_user(target, pos); | |
859 | count -= sizeof(*k); | |
860 | pos += sizeof(*k); | |
861 | } | |
862 | } else { | |
863 | unsigned long __user *u = ubuf; | |
864 | while (count > 0) { | |
865 | if (__put_user(__peek_user(target, pos), u++)) | |
866 | return -EFAULT; | |
867 | count -= sizeof(*u); | |
868 | pos += sizeof(*u); | |
869 | } | |
870 | } | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static int s390_regs_set(struct task_struct *target, | |
875 | const struct user_regset *regset, | |
876 | unsigned int pos, unsigned int count, | |
877 | const void *kbuf, const void __user *ubuf) | |
878 | { | |
879 | int rc = 0; | |
880 | ||
881 | if (target == current) | |
882 | save_access_regs(target->thread.acrs); | |
883 | ||
884 | if (kbuf) { | |
885 | const unsigned long *k = kbuf; | |
886 | while (count > 0 && !rc) { | |
887 | rc = __poke_user(target, pos, *k++); | |
888 | count -= sizeof(*k); | |
889 | pos += sizeof(*k); | |
890 | } | |
891 | } else { | |
892 | const unsigned long __user *u = ubuf; | |
893 | while (count > 0 && !rc) { | |
894 | unsigned long word; | |
895 | rc = __get_user(word, u++); | |
896 | if (rc) | |
897 | break; | |
898 | rc = __poke_user(target, pos, word); | |
899 | count -= sizeof(*u); | |
900 | pos += sizeof(*u); | |
901 | } | |
902 | } | |
903 | ||
904 | if (rc == 0 && target == current) | |
905 | restore_access_regs(target->thread.acrs); | |
906 | ||
907 | return rc; | |
908 | } | |
909 | ||
910 | static int s390_fpregs_get(struct task_struct *target, | |
911 | const struct user_regset *regset, unsigned int pos, | |
912 | unsigned int count, void *kbuf, void __user *ubuf) | |
913 | { | |
4725c860 MS |
914 | if (target == current) { |
915 | save_fp_ctl(&target->thread.fp_regs.fpc); | |
916 | save_fp_regs(target->thread.fp_regs.fprs); | |
917 | } | |
63506c41 MS |
918 | |
919 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
920 | &target->thread.fp_regs, 0, -1); | |
921 | } | |
922 | ||
923 | static int s390_fpregs_set(struct task_struct *target, | |
924 | const struct user_regset *regset, unsigned int pos, | |
925 | unsigned int count, const void *kbuf, | |
926 | const void __user *ubuf) | |
927 | { | |
928 | int rc = 0; | |
929 | ||
4725c860 MS |
930 | if (target == current) { |
931 | save_fp_ctl(&target->thread.fp_regs.fpc); | |
932 | save_fp_regs(target->thread.fp_regs.fprs); | |
933 | } | |
63506c41 MS |
934 | |
935 | /* If setting FPC, must validate it first. */ | |
936 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
4725c860 MS |
937 | u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 }; |
938 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc, | |
63506c41 MS |
939 | 0, offsetof(s390_fp_regs, fprs)); |
940 | if (rc) | |
941 | return rc; | |
4725c860 | 942 | if (ufpc[1] != 0 || test_fp_ctl(ufpc[0])) |
63506c41 | 943 | return -EINVAL; |
4725c860 | 944 | target->thread.fp_regs.fpc = ufpc[0]; |
63506c41 MS |
945 | } |
946 | ||
947 | if (rc == 0 && count > 0) | |
948 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
949 | target->thread.fp_regs.fprs, | |
950 | offsetof(s390_fp_regs, fprs), -1); | |
951 | ||
4725c860 MS |
952 | if (rc == 0 && target == current) { |
953 | restore_fp_ctl(&target->thread.fp_regs.fpc); | |
954 | restore_fp_regs(target->thread.fp_regs.fprs); | |
955 | } | |
63506c41 MS |
956 | |
957 | return rc; | |
958 | } | |
959 | ||
86f2552b MS |
960 | #ifdef CONFIG_64BIT |
961 | ||
962 | static int s390_last_break_get(struct task_struct *target, | |
963 | const struct user_regset *regset, | |
964 | unsigned int pos, unsigned int count, | |
965 | void *kbuf, void __user *ubuf) | |
966 | { | |
967 | if (count > 0) { | |
968 | if (kbuf) { | |
969 | unsigned long *k = kbuf; | |
970 | *k = task_thread_info(target)->last_break; | |
971 | } else { | |
972 | unsigned long __user *u = ubuf; | |
973 | if (__put_user(task_thread_info(target)->last_break, u)) | |
974 | return -EFAULT; | |
975 | } | |
976 | } | |
977 | return 0; | |
978 | } | |
979 | ||
b934069c MS |
980 | static int s390_last_break_set(struct task_struct *target, |
981 | const struct user_regset *regset, | |
982 | unsigned int pos, unsigned int count, | |
983 | const void *kbuf, const void __user *ubuf) | |
984 | { | |
985 | return 0; | |
986 | } | |
987 | ||
d35339a4 MS |
988 | static int s390_tdb_get(struct task_struct *target, |
989 | const struct user_regset *regset, | |
990 | unsigned int pos, unsigned int count, | |
991 | void *kbuf, void __user *ubuf) | |
992 | { | |
993 | struct pt_regs *regs = task_pt_regs(target); | |
994 | unsigned char *data; | |
995 | ||
996 | if (!(regs->int_code & 0x200)) | |
997 | return -ENODATA; | |
998 | data = target->thread.trap_tdb; | |
999 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
1000 | } | |
1001 | ||
1002 | static int s390_tdb_set(struct task_struct *target, | |
1003 | const struct user_regset *regset, | |
1004 | unsigned int pos, unsigned int count, | |
1005 | const void *kbuf, const void __user *ubuf) | |
1006 | { | |
1007 | return 0; | |
1008 | } | |
1009 | ||
86f2552b MS |
1010 | #endif |
1011 | ||
20b40a79 MS |
1012 | static int s390_system_call_get(struct task_struct *target, |
1013 | const struct user_regset *regset, | |
1014 | unsigned int pos, unsigned int count, | |
1015 | void *kbuf, void __user *ubuf) | |
1016 | { | |
1017 | unsigned int *data = &task_thread_info(target)->system_call; | |
1018 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
1019 | data, 0, sizeof(unsigned int)); | |
1020 | } | |
1021 | ||
1022 | static int s390_system_call_set(struct task_struct *target, | |
1023 | const struct user_regset *regset, | |
1024 | unsigned int pos, unsigned int count, | |
1025 | const void *kbuf, const void __user *ubuf) | |
1026 | { | |
1027 | unsigned int *data = &task_thread_info(target)->system_call; | |
1028 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
1029 | data, 0, sizeof(unsigned int)); | |
1030 | } | |
1031 | ||
63506c41 MS |
1032 | static const struct user_regset s390_regsets[] = { |
1033 | [REGSET_GENERAL] = { | |
1034 | .core_note_type = NT_PRSTATUS, | |
1035 | .n = sizeof(s390_regs) / sizeof(long), | |
1036 | .size = sizeof(long), | |
1037 | .align = sizeof(long), | |
1038 | .get = s390_regs_get, | |
1039 | .set = s390_regs_set, | |
1040 | }, | |
1041 | [REGSET_FP] = { | |
1042 | .core_note_type = NT_PRFPREG, | |
1043 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
1044 | .size = sizeof(long), | |
1045 | .align = sizeof(long), | |
1046 | .get = s390_fpregs_get, | |
1047 | .set = s390_fpregs_set, | |
1048 | }, | |
86f2552b MS |
1049 | #ifdef CONFIG_64BIT |
1050 | [REGSET_LAST_BREAK] = { | |
1051 | .core_note_type = NT_S390_LAST_BREAK, | |
1052 | .n = 1, | |
1053 | .size = sizeof(long), | |
1054 | .align = sizeof(long), | |
1055 | .get = s390_last_break_get, | |
b934069c | 1056 | .set = s390_last_break_set, |
86f2552b | 1057 | }, |
d35339a4 MS |
1058 | [REGSET_TDB] = { |
1059 | .core_note_type = NT_S390_TDB, | |
1060 | .n = 1, | |
1061 | .size = 256, | |
1062 | .align = 1, | |
1063 | .get = s390_tdb_get, | |
1064 | .set = s390_tdb_set, | |
1065 | }, | |
86f2552b | 1066 | #endif |
20b40a79 MS |
1067 | [REGSET_SYSTEM_CALL] = { |
1068 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1069 | .n = 1, | |
1070 | .size = sizeof(unsigned int), | |
1071 | .align = sizeof(unsigned int), | |
1072 | .get = s390_system_call_get, | |
1073 | .set = s390_system_call_set, | |
1074 | }, | |
63506c41 MS |
1075 | }; |
1076 | ||
1077 | static const struct user_regset_view user_s390_view = { | |
1078 | .name = UTS_MACHINE, | |
1079 | .e_machine = EM_S390, | |
1080 | .regsets = s390_regsets, | |
1081 | .n = ARRAY_SIZE(s390_regsets) | |
1082 | }; | |
1083 | ||
1084 | #ifdef CONFIG_COMPAT | |
1085 | static int s390_compat_regs_get(struct task_struct *target, | |
1086 | const struct user_regset *regset, | |
1087 | unsigned int pos, unsigned int count, | |
1088 | void *kbuf, void __user *ubuf) | |
1089 | { | |
1090 | if (target == current) | |
1091 | save_access_regs(target->thread.acrs); | |
1092 | ||
1093 | if (kbuf) { | |
1094 | compat_ulong_t *k = kbuf; | |
1095 | while (count > 0) { | |
1096 | *k++ = __peek_user_compat(target, pos); | |
1097 | count -= sizeof(*k); | |
1098 | pos += sizeof(*k); | |
1099 | } | |
1100 | } else { | |
1101 | compat_ulong_t __user *u = ubuf; | |
1102 | while (count > 0) { | |
1103 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1104 | return -EFAULT; | |
1105 | count -= sizeof(*u); | |
1106 | pos += sizeof(*u); | |
1107 | } | |
1108 | } | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static int s390_compat_regs_set(struct task_struct *target, | |
1113 | const struct user_regset *regset, | |
1114 | unsigned int pos, unsigned int count, | |
1115 | const void *kbuf, const void __user *ubuf) | |
1116 | { | |
1117 | int rc = 0; | |
1118 | ||
1119 | if (target == current) | |
1120 | save_access_regs(target->thread.acrs); | |
1121 | ||
1122 | if (kbuf) { | |
1123 | const compat_ulong_t *k = kbuf; | |
1124 | while (count > 0 && !rc) { | |
1125 | rc = __poke_user_compat(target, pos, *k++); | |
1126 | count -= sizeof(*k); | |
1127 | pos += sizeof(*k); | |
1128 | } | |
1129 | } else { | |
1130 | const compat_ulong_t __user *u = ubuf; | |
1131 | while (count > 0 && !rc) { | |
1132 | compat_ulong_t word; | |
1133 | rc = __get_user(word, u++); | |
1134 | if (rc) | |
1135 | break; | |
1136 | rc = __poke_user_compat(target, pos, word); | |
1137 | count -= sizeof(*u); | |
1138 | pos += sizeof(*u); | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | if (rc == 0 && target == current) | |
1143 | restore_access_regs(target->thread.acrs); | |
1144 | ||
1145 | return rc; | |
1146 | } | |
1147 | ||
ea2a4d3a HC |
1148 | static int s390_compat_regs_high_get(struct task_struct *target, |
1149 | const struct user_regset *regset, | |
1150 | unsigned int pos, unsigned int count, | |
1151 | void *kbuf, void __user *ubuf) | |
1152 | { | |
1153 | compat_ulong_t *gprs_high; | |
1154 | ||
1155 | gprs_high = (compat_ulong_t *) | |
1156 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1157 | if (kbuf) { | |
1158 | compat_ulong_t *k = kbuf; | |
1159 | while (count > 0) { | |
1160 | *k++ = *gprs_high; | |
1161 | gprs_high += 2; | |
1162 | count -= sizeof(*k); | |
1163 | } | |
1164 | } else { | |
1165 | compat_ulong_t __user *u = ubuf; | |
1166 | while (count > 0) { | |
1167 | if (__put_user(*gprs_high, u++)) | |
1168 | return -EFAULT; | |
1169 | gprs_high += 2; | |
1170 | count -= sizeof(*u); | |
1171 | } | |
1172 | } | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1177 | const struct user_regset *regset, | |
1178 | unsigned int pos, unsigned int count, | |
1179 | const void *kbuf, const void __user *ubuf) | |
1180 | { | |
1181 | compat_ulong_t *gprs_high; | |
1182 | int rc = 0; | |
1183 | ||
1184 | gprs_high = (compat_ulong_t *) | |
1185 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1186 | if (kbuf) { | |
1187 | const compat_ulong_t *k = kbuf; | |
1188 | while (count > 0) { | |
1189 | *gprs_high = *k++; | |
1190 | *gprs_high += 2; | |
1191 | count -= sizeof(*k); | |
1192 | } | |
1193 | } else { | |
1194 | const compat_ulong_t __user *u = ubuf; | |
1195 | while (count > 0 && !rc) { | |
1196 | unsigned long word; | |
1197 | rc = __get_user(word, u++); | |
1198 | if (rc) | |
1199 | break; | |
1200 | *gprs_high = word; | |
1201 | *gprs_high += 2; | |
1202 | count -= sizeof(*u); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | return rc; | |
1207 | } | |
1208 | ||
86f2552b MS |
1209 | static int s390_compat_last_break_get(struct task_struct *target, |
1210 | const struct user_regset *regset, | |
1211 | unsigned int pos, unsigned int count, | |
1212 | void *kbuf, void __user *ubuf) | |
1213 | { | |
1214 | compat_ulong_t last_break; | |
1215 | ||
1216 | if (count > 0) { | |
1217 | last_break = task_thread_info(target)->last_break; | |
1218 | if (kbuf) { | |
1219 | unsigned long *k = kbuf; | |
1220 | *k = last_break; | |
1221 | } else { | |
1222 | unsigned long __user *u = ubuf; | |
1223 | if (__put_user(last_break, u)) | |
1224 | return -EFAULT; | |
1225 | } | |
1226 | } | |
1227 | return 0; | |
1228 | } | |
1229 | ||
b934069c MS |
1230 | static int s390_compat_last_break_set(struct task_struct *target, |
1231 | const struct user_regset *regset, | |
1232 | unsigned int pos, unsigned int count, | |
1233 | const void *kbuf, const void __user *ubuf) | |
1234 | { | |
1235 | return 0; | |
1236 | } | |
1237 | ||
63506c41 MS |
1238 | static const struct user_regset s390_compat_regsets[] = { |
1239 | [REGSET_GENERAL] = { | |
1240 | .core_note_type = NT_PRSTATUS, | |
1241 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1242 | .size = sizeof(compat_long_t), | |
1243 | .align = sizeof(compat_long_t), | |
1244 | .get = s390_compat_regs_get, | |
1245 | .set = s390_compat_regs_set, | |
1246 | }, | |
1247 | [REGSET_FP] = { | |
1248 | .core_note_type = NT_PRFPREG, | |
1249 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1250 | .size = sizeof(compat_long_t), | |
1251 | .align = sizeof(compat_long_t), | |
1252 | .get = s390_fpregs_get, | |
1253 | .set = s390_fpregs_set, | |
1254 | }, | |
86f2552b MS |
1255 | [REGSET_LAST_BREAK] = { |
1256 | .core_note_type = NT_S390_LAST_BREAK, | |
1257 | .n = 1, | |
1258 | .size = sizeof(long), | |
1259 | .align = sizeof(long), | |
1260 | .get = s390_compat_last_break_get, | |
b934069c | 1261 | .set = s390_compat_last_break_set, |
86f2552b | 1262 | }, |
d35339a4 MS |
1263 | [REGSET_TDB] = { |
1264 | .core_note_type = NT_S390_TDB, | |
1265 | .n = 1, | |
1266 | .size = 256, | |
1267 | .align = 1, | |
1268 | .get = s390_tdb_get, | |
1269 | .set = s390_tdb_set, | |
1270 | }, | |
20b40a79 MS |
1271 | [REGSET_SYSTEM_CALL] = { |
1272 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1273 | .n = 1, | |
1274 | .size = sizeof(compat_uint_t), | |
1275 | .align = sizeof(compat_uint_t), | |
1276 | .get = s390_system_call_get, | |
1277 | .set = s390_system_call_set, | |
1278 | }, | |
ea2a4d3a | 1279 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 1280 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1281 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1282 | .size = sizeof(compat_long_t), | |
1283 | .align = sizeof(compat_long_t), | |
1284 | .get = s390_compat_regs_high_get, | |
1285 | .set = s390_compat_regs_high_set, | |
1286 | }, | |
63506c41 MS |
1287 | }; |
1288 | ||
1289 | static const struct user_regset_view user_s390_compat_view = { | |
1290 | .name = "s390", | |
1291 | .e_machine = EM_S390, | |
1292 | .regsets = s390_compat_regsets, | |
1293 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1294 | }; | |
1295 | #endif | |
1296 | ||
1297 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1298 | { | |
1299 | #ifdef CONFIG_COMPAT | |
1300 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1301 | return &user_s390_compat_view; | |
1302 | #endif | |
1303 | return &user_s390_view; | |
1304 | } | |
952974ac HC |
1305 | |
1306 | static const char *gpr_names[NUM_GPRS] = { | |
1307 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1308 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1309 | }; | |
1310 | ||
1311 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1312 | { | |
1313 | if (offset >= NUM_GPRS) | |
1314 | return 0; | |
1315 | return regs->gprs[offset]; | |
1316 | } | |
1317 | ||
1318 | int regs_query_register_offset(const char *name) | |
1319 | { | |
1320 | unsigned long offset; | |
1321 | ||
1322 | if (!name || *name != 'r') | |
1323 | return -EINVAL; | |
958d9072 | 1324 | if (kstrtoul(name + 1, 10, &offset)) |
952974ac HC |
1325 | return -EINVAL; |
1326 | if (offset >= NUM_GPRS) | |
1327 | return -EINVAL; | |
1328 | return offset; | |
1329 | } | |
1330 | ||
1331 | const char *regs_query_register_name(unsigned int offset) | |
1332 | { | |
1333 | if (offset >= NUM_GPRS) | |
1334 | return NULL; | |
1335 | return gpr_names[offset]; | |
1336 | } | |
1337 | ||
1338 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1339 | { | |
1340 | unsigned long ksp = kernel_stack_pointer(regs); | |
1341 | ||
1342 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1347 | * @regs:pt_regs which contains kernel stack pointer. | |
1348 | * @n:stack entry number. | |
1349 | * | |
1350 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1351 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1352 | * this returns 0. | |
1353 | */ | |
1354 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1355 | { | |
1356 | unsigned long addr; | |
1357 | ||
1358 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1359 | if (!regs_within_kernel_stack(regs, addr)) | |
1360 | return 0; | |
1361 | return *(unsigned long *)addr; | |
1362 | } |