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Commit | Line | Data |
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1da177e4 | 1 | /* |
5e9a2692 | 2 | * Ptrace user space interface. |
1da177e4 | 3 | * |
5e9a2692 MS |
4 | * Copyright IBM Corp. 1999,2010 |
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> |
9bf1226b | 23 | #include <trace/syscall.h> |
bcf5cef7 | 24 | #include <asm/compat.h> |
1da177e4 LT |
25 | #include <asm/segment.h> |
26 | #include <asm/page.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/pgalloc.h> | |
29 | #include <asm/system.h> | |
30 | #include <asm/uaccess.h> | |
778959db | 31 | #include <asm/unistd.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, |
20b40a79 | 45 | REGSET_SYSTEM_CALL, |
ea2a4d3a | 46 | REGSET_GENERAL_EXTENDED, |
63506c41 MS |
47 | }; |
48 | ||
5e9a2692 | 49 | void update_per_regs(struct task_struct *task) |
1da177e4 | 50 | { |
5e9a2692 MS |
51 | struct pt_regs *regs = task_pt_regs(task); |
52 | struct thread_struct *thread = &task->thread; | |
a45aff52 | 53 | struct per_regs old, new; |
5e9a2692 | 54 | |
a45aff52 MS |
55 | /* Copy user specified PER registers */ |
56 | new.control = thread->per_user.control; | |
57 | new.start = thread->per_user.start; | |
58 | new.end = thread->per_user.end; | |
59 | ||
60 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
61 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { | |
62 | new.control |= PER_EVENT_IFETCH; | |
63 | new.start = 0; | |
64 | new.end = PSW_ADDR_INSN; | |
65 | } | |
5e9a2692 MS |
66 | |
67 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 68 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 69 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 70 | return; |
c3311c13 | 71 | } |
5e9a2692 MS |
72 | regs->psw.mask |= PSW_MASK_PER; |
73 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
74 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
75 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
76 | } |
77 | ||
0ac30be4 | 78 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 79 | { |
5e9a2692 MS |
80 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
81 | if (task == current) | |
82 | update_per_regs(task); | |
1da177e4 LT |
83 | } |
84 | ||
0ac30be4 | 85 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 86 | { |
5e9a2692 MS |
87 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
88 | if (task == current) | |
89 | update_per_regs(task); | |
1da177e4 LT |
90 | } |
91 | ||
92 | /* | |
93 | * Called by kernel/ptrace.c when detaching.. | |
94 | * | |
5e9a2692 | 95 | * Clear all debugging related fields. |
1da177e4 | 96 | */ |
5e9a2692 | 97 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 98 | { |
5e9a2692 MS |
99 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
100 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
101 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
102 | clear_tsk_thread_flag(task, TIF_PER_TRAP); | |
1da177e4 LT |
103 | } |
104 | ||
347a8dc3 | 105 | #ifndef CONFIG_64BIT |
1da177e4 LT |
106 | # define __ADDR_MASK 3 |
107 | #else | |
108 | # define __ADDR_MASK 7 | |
109 | #endif | |
110 | ||
5e9a2692 MS |
111 | static inline unsigned long __peek_user_per(struct task_struct *child, |
112 | addr_t addr) | |
113 | { | |
114 | struct per_struct_kernel *dummy = NULL; | |
115 | ||
116 | if (addr == (addr_t) &dummy->cr9) | |
117 | /* Control bits of the active per set. */ | |
118 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
119 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
120 | else if (addr == (addr_t) &dummy->cr10) | |
121 | /* Start address of the active per set. */ | |
122 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
123 | 0 : child->thread.per_user.start; | |
124 | else if (addr == (addr_t) &dummy->cr11) | |
125 | /* End address of the active per set. */ | |
126 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
127 | PSW_ADDR_INSN : child->thread.per_user.end; | |
128 | else if (addr == (addr_t) &dummy->bits) | |
129 | /* Single-step bit. */ | |
130 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
131 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
132 | else if (addr == (addr_t) &dummy->starting_addr) | |
133 | /* Start address of the user specified per set. */ | |
134 | return child->thread.per_user.start; | |
135 | else if (addr == (addr_t) &dummy->ending_addr) | |
136 | /* End address of the user specified per set. */ | |
137 | return child->thread.per_user.end; | |
138 | else if (addr == (addr_t) &dummy->perc_atmid) | |
139 | /* PER code, ATMID and AI of the last PER trap */ | |
140 | return (unsigned long) | |
141 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
142 | else if (addr == (addr_t) &dummy->address) | |
143 | /* Address of the last PER trap */ | |
144 | return child->thread.per_event.address; | |
145 | else if (addr == (addr_t) &dummy->access_id) | |
146 | /* Access id of the last PER trap */ | |
147 | return (unsigned long) | |
148 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
149 | return 0; | |
150 | } | |
151 | ||
1da177e4 LT |
152 | /* |
153 | * Read the word at offset addr from the user area of a process. The | |
154 | * trouble here is that the information is littered over different | |
155 | * locations. The process registers are found on the kernel stack, | |
156 | * the floating point stuff and the trace settings are stored in | |
157 | * the task structure. In addition the different structures in | |
158 | * struct user contain pad bytes that should be read as zeroes. | |
159 | * Lovely... | |
160 | */ | |
63506c41 | 161 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
162 | { |
163 | struct user *dummy = NULL; | |
63506c41 | 164 | addr_t offset, tmp; |
1da177e4 LT |
165 | |
166 | if (addr < (addr_t) &dummy->regs.acrs) { | |
167 | /* | |
168 | * psw and gprs are stored on the stack | |
169 | */ | |
c7584fb6 | 170 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 | 171 | if (addr == (addr_t) &dummy->regs.psw.mask) |
b50511e4 | 172 | /* Return a clean psw mask. */ |
d4e81b35 | 173 | tmp = psw_user_bits | (tmp & PSW_MASK_USER); |
1da177e4 LT |
174 | |
175 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
176 | /* | |
177 | * access registers are stored in the thread structure | |
178 | */ | |
179 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 180 | #ifdef CONFIG_64BIT |
778959db MS |
181 | /* |
182 | * Very special case: old & broken 64 bit gdb reading | |
183 | * from acrs[15]. Result is a 64 bit value. Read the | |
184 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
185 | */ | |
186 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
187 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
188 | else | |
189 | #endif | |
1da177e4 LT |
190 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
191 | ||
192 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
193 | /* | |
194 | * orig_gpr2 is stored on the kernel stack | |
195 | */ | |
c7584fb6 | 196 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 197 | |
3d6e48f4 JW |
198 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
199 | /* | |
200 | * prevent reads of padding hole between | |
201 | * orig_gpr2 and fp_regs on s390. | |
202 | */ | |
203 | tmp = 0; | |
204 | ||
1da177e4 LT |
205 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
206 | /* | |
207 | * floating point regs. are stored in the thread structure | |
208 | */ | |
209 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
210 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
211 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
212 | tmp &= (unsigned long) FPC_VALID_MASK | |
213 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
214 | |
215 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
216 | /* | |
5e9a2692 | 217 | * Handle access to the per_info structure. |
1da177e4 | 218 | */ |
5e9a2692 MS |
219 | addr -= (addr_t) &dummy->regs.per_info; |
220 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
221 | |
222 | } else | |
223 | tmp = 0; | |
224 | ||
63506c41 | 225 | return tmp; |
1da177e4 LT |
226 | } |
227 | ||
1da177e4 | 228 | static int |
63506c41 | 229 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 230 | { |
63506c41 | 231 | addr_t tmp, mask; |
1da177e4 LT |
232 | |
233 | /* | |
234 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 235 | * an alignment of 4. Programmers from hell... |
1da177e4 | 236 | */ |
778959db | 237 | mask = __ADDR_MASK; |
347a8dc3 | 238 | #ifdef CONFIG_64BIT |
547e3cec MS |
239 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
240 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
241 | mask = 3; |
242 | #endif | |
243 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
244 | return -EIO; |
245 | ||
63506c41 MS |
246 | tmp = __peek_user(child, addr); |
247 | return put_user(tmp, (addr_t __user *) data); | |
248 | } | |
249 | ||
5e9a2692 MS |
250 | static inline void __poke_user_per(struct task_struct *child, |
251 | addr_t addr, addr_t data) | |
252 | { | |
253 | struct per_struct_kernel *dummy = NULL; | |
254 | ||
255 | /* | |
256 | * There are only three fields in the per_info struct that the | |
257 | * debugger user can write to. | |
258 | * 1) cr9: the debugger wants to set a new PER event mask | |
259 | * 2) starting_addr: the debugger wants to set a new starting | |
260 | * address to use with the PER event mask. | |
261 | * 3) ending_addr: the debugger wants to set a new ending | |
262 | * address to use with the PER event mask. | |
263 | * The user specified PER event mask and the start and end | |
264 | * addresses are used only if single stepping is not in effect. | |
265 | * Writes to any other field in per_info are ignored. | |
266 | */ | |
267 | if (addr == (addr_t) &dummy->cr9) | |
268 | /* PER event mask of the user specified per set. */ | |
269 | child->thread.per_user.control = | |
270 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
271 | else if (addr == (addr_t) &dummy->starting_addr) | |
272 | /* Starting address of the user specified per set. */ | |
273 | child->thread.per_user.start = data; | |
274 | else if (addr == (addr_t) &dummy->ending_addr) | |
275 | /* Ending address of the user specified per set. */ | |
276 | child->thread.per_user.end = data; | |
277 | } | |
278 | ||
63506c41 MS |
279 | /* |
280 | * Write a word to the user area of a process at location addr. This | |
281 | * operation does have an additional problem compared to peek_user. | |
282 | * Stores to the program status word and on the floating point | |
283 | * control register needs to get checked for validity. | |
284 | */ | |
285 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
286 | { | |
287 | struct user *dummy = NULL; | |
d4e81b35 | 288 | addr_t offset; |
63506c41 | 289 | |
1da177e4 LT |
290 | if (addr < (addr_t) &dummy->regs.acrs) { |
291 | /* | |
292 | * psw and gprs are stored on the stack | |
293 | */ | |
294 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
d4e81b35 MS |
295 | ((data & ~PSW_MASK_USER) != psw_user_bits || |
296 | ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)))) | |
1da177e4 LT |
297 | /* Invalid psw mask. */ |
298 | return -EINVAL; | |
c7584fb6 | 299 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
300 | |
301 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
302 | /* | |
303 | * access registers are stored in the thread structure | |
304 | */ | |
305 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 306 | #ifdef CONFIG_64BIT |
778959db MS |
307 | /* |
308 | * Very special case: old & broken 64 bit gdb writing | |
309 | * to acrs[15] with a 64 bit value. Ignore the lower | |
310 | * half of the value and write the upper 32 bit to | |
311 | * acrs[15]. Sick... | |
312 | */ | |
313 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
314 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
315 | else | |
316 | #endif | |
1da177e4 LT |
317 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
318 | ||
319 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
320 | /* | |
321 | * orig_gpr2 is stored on the kernel stack | |
322 | */ | |
c7584fb6 | 323 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 324 | |
3d6e48f4 JW |
325 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
326 | /* | |
327 | * prevent writes of padding hole between | |
328 | * orig_gpr2 and fp_regs on s390. | |
329 | */ | |
330 | return 0; | |
331 | ||
1da177e4 LT |
332 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
333 | /* | |
334 | * floating point regs. are stored in the thread structure | |
335 | */ | |
336 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
337 | (data & ~((unsigned long) FPC_VALID_MASK |
338 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
339 | return -EINVAL; |
340 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
341 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
342 | ||
343 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
344 | /* | |
5e9a2692 | 345 | * Handle access to the per_info structure. |
1da177e4 | 346 | */ |
5e9a2692 MS |
347 | addr -= (addr_t) &dummy->regs.per_info; |
348 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
349 | |
350 | } | |
351 | ||
1da177e4 LT |
352 | return 0; |
353 | } | |
354 | ||
5e9a2692 | 355 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 356 | { |
63506c41 MS |
357 | addr_t mask; |
358 | ||
359 | /* | |
360 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
361 | * an alignment of 4. Programmers from hell indeed... | |
362 | */ | |
363 | mask = __ADDR_MASK; | |
364 | #ifdef CONFIG_64BIT | |
547e3cec MS |
365 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
366 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
367 | mask = 3; |
368 | #endif | |
369 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
370 | return -EIO; | |
371 | ||
372 | return __poke_user(child, addr, data); | |
373 | } | |
374 | ||
9b05a69e NK |
375 | long arch_ptrace(struct task_struct *child, long request, |
376 | unsigned long addr, unsigned long data) | |
1da177e4 | 377 | { |
1da177e4 LT |
378 | ptrace_area parea; |
379 | int copied, ret; | |
380 | ||
381 | switch (request) { | |
1da177e4 LT |
382 | case PTRACE_PEEKUSR: |
383 | /* read the word at location addr in the USER area. */ | |
384 | return peek_user(child, addr, data); | |
385 | ||
1da177e4 LT |
386 | case PTRACE_POKEUSR: |
387 | /* write the word at location addr in the USER area */ | |
388 | return poke_user(child, addr, data); | |
389 | ||
390 | case PTRACE_PEEKUSR_AREA: | |
391 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 392 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
393 | sizeof(parea))) |
394 | return -EFAULT; | |
395 | addr = parea.kernel_addr; | |
396 | data = parea.process_addr; | |
397 | copied = 0; | |
398 | while (copied < parea.len) { | |
399 | if (request == PTRACE_PEEKUSR_AREA) | |
400 | ret = peek_user(child, addr, data); | |
401 | else { | |
2b67fc46 HC |
402 | addr_t utmp; |
403 | if (get_user(utmp, | |
404 | (addr_t __force __user *) data)) | |
1da177e4 | 405 | return -EFAULT; |
2b67fc46 | 406 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
407 | } |
408 | if (ret) | |
409 | return ret; | |
410 | addr += sizeof(unsigned long); | |
411 | data += sizeof(unsigned long); | |
412 | copied += sizeof(unsigned long); | |
413 | } | |
414 | return 0; | |
86f2552b MS |
415 | case PTRACE_GET_LAST_BREAK: |
416 | put_user(task_thread_info(child)->last_break, | |
417 | (unsigned long __user *) data); | |
418 | return 0; | |
07805ac8 CB |
419 | default: |
420 | /* Removing high order bit from addr (only for 31 bit). */ | |
421 | addr &= PSW_ADDR_INSN; | |
422 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 423 | } |
1da177e4 LT |
424 | } |
425 | ||
347a8dc3 | 426 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
427 | /* |
428 | * Now the fun part starts... a 31 bit program running in the | |
429 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
430 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
431 | * to handle, the difference to the 64 bit versions of the requests | |
432 | * is that the access is done in multiples of 4 byte instead of | |
433 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
434 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
435 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
436 | * is a 31 bit program too, the content of struct user can be | |
437 | * emulated. A 31 bit program peeking into the struct user of | |
438 | * a 64 bit program is a no-no. | |
439 | */ | |
440 | ||
5e9a2692 MS |
441 | /* |
442 | * Same as peek_user_per but for a 31 bit program. | |
443 | */ | |
444 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
445 | addr_t addr) | |
446 | { | |
447 | struct compat_per_struct_kernel *dummy32 = NULL; | |
448 | ||
449 | if (addr == (addr_t) &dummy32->cr9) | |
450 | /* Control bits of the active per set. */ | |
451 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
452 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
453 | else if (addr == (addr_t) &dummy32->cr10) | |
454 | /* Start address of the active per set. */ | |
455 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
456 | 0 : child->thread.per_user.start; | |
457 | else if (addr == (addr_t) &dummy32->cr11) | |
458 | /* End address of the active per set. */ | |
459 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
460 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
461 | else if (addr == (addr_t) &dummy32->bits) | |
462 | /* Single-step bit. */ | |
463 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
464 | 0x80000000 : 0; | |
465 | else if (addr == (addr_t) &dummy32->starting_addr) | |
466 | /* Start address of the user specified per set. */ | |
467 | return (__u32) child->thread.per_user.start; | |
468 | else if (addr == (addr_t) &dummy32->ending_addr) | |
469 | /* End address of the user specified per set. */ | |
470 | return (__u32) child->thread.per_user.end; | |
471 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
472 | /* PER code, ATMID and AI of the last PER trap */ | |
473 | return (__u32) child->thread.per_event.cause << 16; | |
474 | else if (addr == (addr_t) &dummy32->address) | |
475 | /* Address of the last PER trap */ | |
476 | return (__u32) child->thread.per_event.address; | |
477 | else if (addr == (addr_t) &dummy32->access_id) | |
478 | /* Access id of the last PER trap */ | |
479 | return (__u32) child->thread.per_event.paid << 24; | |
480 | return 0; | |
481 | } | |
482 | ||
1da177e4 LT |
483 | /* |
484 | * Same as peek_user but for a 31 bit program. | |
485 | */ | |
63506c41 | 486 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 487 | { |
5e9a2692 | 488 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
489 | addr_t offset; |
490 | __u32 tmp; | |
491 | ||
1da177e4 | 492 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 493 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
494 | /* |
495 | * psw and gprs are stored on the stack | |
496 | */ | |
497 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
498 | /* Fake a 31 bit psw mask. */ | |
b50511e4 MS |
499 | tmp = (__u32)(regs->psw.mask >> 32); |
500 | tmp = psw32_user_bits | (tmp & PSW32_MASK_USER); | |
1da177e4 LT |
501 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
502 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
503 | tmp = (__u32) regs->psw.addr | |
504 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
505 | } else { |
506 | /* gpr 0-15 */ | |
b50511e4 | 507 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
508 | } |
509 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
510 | /* | |
511 | * access registers are stored in the thread structure | |
512 | */ | |
513 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
514 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
515 | ||
516 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
517 | /* | |
518 | * orig_gpr2 is stored on the kernel stack | |
519 | */ | |
c7584fb6 | 520 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 521 | |
3d6e48f4 JW |
522 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
523 | /* | |
524 | * prevent reads of padding hole between | |
525 | * orig_gpr2 and fp_regs on s390. | |
526 | */ | |
527 | tmp = 0; | |
528 | ||
1da177e4 LT |
529 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
530 | /* | |
531 | * floating point regs. are stored in the thread structure | |
532 | */ | |
533 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
534 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
535 | ||
536 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
537 | /* | |
5e9a2692 | 538 | * Handle access to the per_info structure. |
1da177e4 | 539 | */ |
5e9a2692 MS |
540 | addr -= (addr_t) &dummy32->regs.per_info; |
541 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
542 | |
543 | } else | |
544 | tmp = 0; | |
545 | ||
63506c41 MS |
546 | return tmp; |
547 | } | |
548 | ||
549 | static int peek_user_compat(struct task_struct *child, | |
550 | addr_t addr, addr_t data) | |
551 | { | |
552 | __u32 tmp; | |
553 | ||
7757591a | 554 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
555 | return -EIO; |
556 | ||
557 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
558 | return put_user(tmp, (__u32 __user *) data); |
559 | } | |
560 | ||
5e9a2692 MS |
561 | /* |
562 | * Same as poke_user_per but for a 31 bit program. | |
563 | */ | |
564 | static inline void __poke_user_per_compat(struct task_struct *child, | |
565 | addr_t addr, __u32 data) | |
566 | { | |
567 | struct compat_per_struct_kernel *dummy32 = NULL; | |
568 | ||
569 | if (addr == (addr_t) &dummy32->cr9) | |
570 | /* PER event mask of the user specified per set. */ | |
571 | child->thread.per_user.control = | |
572 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
573 | else if (addr == (addr_t) &dummy32->starting_addr) | |
574 | /* Starting address of the user specified per set. */ | |
575 | child->thread.per_user.start = data; | |
576 | else if (addr == (addr_t) &dummy32->ending_addr) | |
577 | /* Ending address of the user specified per set. */ | |
578 | child->thread.per_user.end = data; | |
579 | } | |
580 | ||
1da177e4 LT |
581 | /* |
582 | * Same as poke_user but for a 31 bit program. | |
583 | */ | |
63506c41 MS |
584 | static int __poke_user_compat(struct task_struct *child, |
585 | addr_t addr, addr_t data) | |
1da177e4 | 586 | { |
5e9a2692 | 587 | struct compat_user *dummy32 = NULL; |
63506c41 | 588 | __u32 tmp = (__u32) data; |
1da177e4 | 589 | addr_t offset; |
1da177e4 LT |
590 | |
591 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 592 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
593 | /* |
594 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
595 | */ | |
596 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
597 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
b50511e4 | 598 | if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits) |
1da177e4 LT |
599 | /* Invalid psw mask. */ |
600 | return -EINVAL; | |
b50511e4 | 601 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 602 | (regs->psw.mask & PSW_MASK_BA) | |
b50511e4 | 603 | (__u64)(tmp & PSW32_MASK_USER) << 32; |
1da177e4 LT |
604 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
605 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 606 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
607 | /* Transfer 31 bit amode bit to psw mask. */ |
608 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
609 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
610 | } else { |
611 | /* gpr 0-15 */ | |
b50511e4 | 612 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
613 | } |
614 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
615 | /* | |
616 | * access registers are stored in the thread structure | |
617 | */ | |
618 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
619 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
620 | ||
621 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
622 | /* | |
623 | * orig_gpr2 is stored on the kernel stack | |
624 | */ | |
c7584fb6 | 625 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 626 | |
3d6e48f4 JW |
627 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
628 | /* | |
629 | * prevent writess of padding hole between | |
630 | * orig_gpr2 and fp_regs on s390. | |
631 | */ | |
632 | return 0; | |
633 | ||
1da177e4 LT |
634 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
635 | /* | |
636 | * floating point regs. are stored in the thread structure | |
637 | */ | |
638 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
639 | (tmp & ~FPC_VALID_MASK) != 0) | |
640 | /* Invalid floating point control. */ | |
641 | return -EINVAL; | |
642 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
643 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
644 | ||
645 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
646 | /* | |
5e9a2692 | 647 | * Handle access to the per_info structure. |
1da177e4 | 648 | */ |
5e9a2692 MS |
649 | addr -= (addr_t) &dummy32->regs.per_info; |
650 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
651 | } |
652 | ||
1da177e4 LT |
653 | return 0; |
654 | } | |
655 | ||
63506c41 MS |
656 | static int poke_user_compat(struct task_struct *child, |
657 | addr_t addr, addr_t data) | |
658 | { | |
5e9a2692 MS |
659 | if (!is_compat_task() || (addr & 3) || |
660 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
661 | return -EIO; |
662 | ||
663 | return __poke_user_compat(child, addr, data); | |
664 | } | |
665 | ||
b499d76b RM |
666 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
667 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 668 | { |
b499d76b RM |
669 | unsigned long addr = caddr; |
670 | unsigned long data = cdata; | |
5e9a2692 | 671 | compat_ptrace_area parea; |
1da177e4 LT |
672 | int copied, ret; |
673 | ||
674 | switch (request) { | |
1da177e4 LT |
675 | case PTRACE_PEEKUSR: |
676 | /* read the word at location addr in the USER area. */ | |
63506c41 | 677 | return peek_user_compat(child, addr, data); |
1da177e4 | 678 | |
1da177e4 LT |
679 | case PTRACE_POKEUSR: |
680 | /* write the word at location addr in the USER area */ | |
63506c41 | 681 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
682 | |
683 | case PTRACE_PEEKUSR_AREA: | |
684 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 685 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
686 | sizeof(parea))) |
687 | return -EFAULT; | |
688 | addr = parea.kernel_addr; | |
689 | data = parea.process_addr; | |
690 | copied = 0; | |
691 | while (copied < parea.len) { | |
692 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 693 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 694 | else { |
2b67fc46 HC |
695 | __u32 utmp; |
696 | if (get_user(utmp, | |
697 | (__u32 __force __user *) data)) | |
1da177e4 | 698 | return -EFAULT; |
63506c41 | 699 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
700 | } |
701 | if (ret) | |
702 | return ret; | |
703 | addr += sizeof(unsigned int); | |
704 | data += sizeof(unsigned int); | |
705 | copied += sizeof(unsigned int); | |
706 | } | |
707 | return 0; | |
86f2552b MS |
708 | case PTRACE_GET_LAST_BREAK: |
709 | put_user(task_thread_info(child)->last_break, | |
710 | (unsigned int __user *) data); | |
711 | return 0; | |
1da177e4 | 712 | } |
b499d76b | 713 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
714 | } |
715 | #endif | |
716 | ||
753c4dd6 | 717 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 718 | { |
545c174d | 719 | long ret = 0; |
1da177e4 | 720 | |
bcf5cef7 HC |
721 | /* Do the secure computing check first. */ |
722 | secure_computing(regs->gprs[2]); | |
723 | ||
c5c3a6d8 | 724 | /* |
753c4dd6 MS |
725 | * The sysc_tracesys code in entry.S stored the system |
726 | * call number to gprs[2]. | |
c5c3a6d8 | 727 | */ |
753c4dd6 MS |
728 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
729 | (tracehook_report_syscall_entry(regs) || | |
730 | regs->gprs[2] >= NR_syscalls)) { | |
731 | /* | |
732 | * Tracing decided this syscall should not happen or the | |
733 | * debugger stored an invalid system call number. Skip | |
734 | * the system call and the system call restart handling. | |
735 | */ | |
b6ef5bb3 | 736 | clear_thread_flag(TIF_SYSCALL); |
753c4dd6 | 737 | ret = -1; |
1da177e4 | 738 | } |
753c4dd6 | 739 | |
66700001 | 740 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 741 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 742 | |
b05d8447 EP |
743 | audit_syscall_entry(is_compat_task() ? |
744 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, | |
745 | regs->gprs[2], regs->orig_gpr2, | |
746 | regs->gprs[3], regs->gprs[4], | |
747 | regs->gprs[5]); | |
545c174d | 748 | return ret ?: regs->gprs[2]; |
753c4dd6 MS |
749 | } |
750 | ||
751 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
752 | { | |
d7e7528b | 753 | audit_syscall_exit(regs); |
753c4dd6 | 754 | |
66700001 | 755 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 756 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 757 | |
753c4dd6 MS |
758 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
759 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 760 | } |
63506c41 MS |
761 | |
762 | /* | |
763 | * user_regset definitions. | |
764 | */ | |
765 | ||
766 | static int s390_regs_get(struct task_struct *target, | |
767 | const struct user_regset *regset, | |
768 | unsigned int pos, unsigned int count, | |
769 | void *kbuf, void __user *ubuf) | |
770 | { | |
771 | if (target == current) | |
772 | save_access_regs(target->thread.acrs); | |
773 | ||
774 | if (kbuf) { | |
775 | unsigned long *k = kbuf; | |
776 | while (count > 0) { | |
777 | *k++ = __peek_user(target, pos); | |
778 | count -= sizeof(*k); | |
779 | pos += sizeof(*k); | |
780 | } | |
781 | } else { | |
782 | unsigned long __user *u = ubuf; | |
783 | while (count > 0) { | |
784 | if (__put_user(__peek_user(target, pos), u++)) | |
785 | return -EFAULT; | |
786 | count -= sizeof(*u); | |
787 | pos += sizeof(*u); | |
788 | } | |
789 | } | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static int s390_regs_set(struct task_struct *target, | |
794 | const struct user_regset *regset, | |
795 | unsigned int pos, unsigned int count, | |
796 | const void *kbuf, const void __user *ubuf) | |
797 | { | |
798 | int rc = 0; | |
799 | ||
800 | if (target == current) | |
801 | save_access_regs(target->thread.acrs); | |
802 | ||
803 | if (kbuf) { | |
804 | const unsigned long *k = kbuf; | |
805 | while (count > 0 && !rc) { | |
806 | rc = __poke_user(target, pos, *k++); | |
807 | count -= sizeof(*k); | |
808 | pos += sizeof(*k); | |
809 | } | |
810 | } else { | |
811 | const unsigned long __user *u = ubuf; | |
812 | while (count > 0 && !rc) { | |
813 | unsigned long word; | |
814 | rc = __get_user(word, u++); | |
815 | if (rc) | |
816 | break; | |
817 | rc = __poke_user(target, pos, word); | |
818 | count -= sizeof(*u); | |
819 | pos += sizeof(*u); | |
820 | } | |
821 | } | |
822 | ||
823 | if (rc == 0 && target == current) | |
824 | restore_access_regs(target->thread.acrs); | |
825 | ||
826 | return rc; | |
827 | } | |
828 | ||
829 | static int s390_fpregs_get(struct task_struct *target, | |
830 | const struct user_regset *regset, unsigned int pos, | |
831 | unsigned int count, void *kbuf, void __user *ubuf) | |
832 | { | |
833 | if (target == current) | |
834 | save_fp_regs(&target->thread.fp_regs); | |
835 | ||
836 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
837 | &target->thread.fp_regs, 0, -1); | |
838 | } | |
839 | ||
840 | static int s390_fpregs_set(struct task_struct *target, | |
841 | const struct user_regset *regset, unsigned int pos, | |
842 | unsigned int count, const void *kbuf, | |
843 | const void __user *ubuf) | |
844 | { | |
845 | int rc = 0; | |
846 | ||
847 | if (target == current) | |
848 | save_fp_regs(&target->thread.fp_regs); | |
849 | ||
850 | /* If setting FPC, must validate it first. */ | |
851 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
852 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
853 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
854 | 0, offsetof(s390_fp_regs, fprs)); | |
855 | if (rc) | |
856 | return rc; | |
857 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
858 | return -EINVAL; | |
859 | target->thread.fp_regs.fpc = fpc[0]; | |
860 | } | |
861 | ||
862 | if (rc == 0 && count > 0) | |
863 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
864 | target->thread.fp_regs.fprs, | |
865 | offsetof(s390_fp_regs, fprs), -1); | |
866 | ||
867 | if (rc == 0 && target == current) | |
868 | restore_fp_regs(&target->thread.fp_regs); | |
869 | ||
870 | return rc; | |
871 | } | |
872 | ||
86f2552b MS |
873 | #ifdef CONFIG_64BIT |
874 | ||
875 | static int s390_last_break_get(struct task_struct *target, | |
876 | const struct user_regset *regset, | |
877 | unsigned int pos, unsigned int count, | |
878 | void *kbuf, void __user *ubuf) | |
879 | { | |
880 | if (count > 0) { | |
881 | if (kbuf) { | |
882 | unsigned long *k = kbuf; | |
883 | *k = task_thread_info(target)->last_break; | |
884 | } else { | |
885 | unsigned long __user *u = ubuf; | |
886 | if (__put_user(task_thread_info(target)->last_break, u)) | |
887 | return -EFAULT; | |
888 | } | |
889 | } | |
890 | return 0; | |
891 | } | |
892 | ||
b934069c MS |
893 | static int s390_last_break_set(struct task_struct *target, |
894 | const struct user_regset *regset, | |
895 | unsigned int pos, unsigned int count, | |
896 | const void *kbuf, const void __user *ubuf) | |
897 | { | |
898 | return 0; | |
899 | } | |
900 | ||
86f2552b MS |
901 | #endif |
902 | ||
20b40a79 MS |
903 | static int s390_system_call_get(struct task_struct *target, |
904 | const struct user_regset *regset, | |
905 | unsigned int pos, unsigned int count, | |
906 | void *kbuf, void __user *ubuf) | |
907 | { | |
908 | unsigned int *data = &task_thread_info(target)->system_call; | |
909 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
910 | data, 0, sizeof(unsigned int)); | |
911 | } | |
912 | ||
913 | static int s390_system_call_set(struct task_struct *target, | |
914 | const struct user_regset *regset, | |
915 | unsigned int pos, unsigned int count, | |
916 | const void *kbuf, const void __user *ubuf) | |
917 | { | |
918 | unsigned int *data = &task_thread_info(target)->system_call; | |
919 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
920 | data, 0, sizeof(unsigned int)); | |
921 | } | |
922 | ||
63506c41 MS |
923 | static const struct user_regset s390_regsets[] = { |
924 | [REGSET_GENERAL] = { | |
925 | .core_note_type = NT_PRSTATUS, | |
926 | .n = sizeof(s390_regs) / sizeof(long), | |
927 | .size = sizeof(long), | |
928 | .align = sizeof(long), | |
929 | .get = s390_regs_get, | |
930 | .set = s390_regs_set, | |
931 | }, | |
932 | [REGSET_FP] = { | |
933 | .core_note_type = NT_PRFPREG, | |
934 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
935 | .size = sizeof(long), | |
936 | .align = sizeof(long), | |
937 | .get = s390_fpregs_get, | |
938 | .set = s390_fpregs_set, | |
939 | }, | |
86f2552b MS |
940 | #ifdef CONFIG_64BIT |
941 | [REGSET_LAST_BREAK] = { | |
942 | .core_note_type = NT_S390_LAST_BREAK, | |
943 | .n = 1, | |
944 | .size = sizeof(long), | |
945 | .align = sizeof(long), | |
946 | .get = s390_last_break_get, | |
b934069c | 947 | .set = s390_last_break_set, |
86f2552b MS |
948 | }, |
949 | #endif | |
20b40a79 MS |
950 | [REGSET_SYSTEM_CALL] = { |
951 | .core_note_type = NT_S390_SYSTEM_CALL, | |
952 | .n = 1, | |
953 | .size = sizeof(unsigned int), | |
954 | .align = sizeof(unsigned int), | |
955 | .get = s390_system_call_get, | |
956 | .set = s390_system_call_set, | |
957 | }, | |
63506c41 MS |
958 | }; |
959 | ||
960 | static const struct user_regset_view user_s390_view = { | |
961 | .name = UTS_MACHINE, | |
962 | .e_machine = EM_S390, | |
963 | .regsets = s390_regsets, | |
964 | .n = ARRAY_SIZE(s390_regsets) | |
965 | }; | |
966 | ||
967 | #ifdef CONFIG_COMPAT | |
968 | static int s390_compat_regs_get(struct task_struct *target, | |
969 | const struct user_regset *regset, | |
970 | unsigned int pos, unsigned int count, | |
971 | void *kbuf, void __user *ubuf) | |
972 | { | |
973 | if (target == current) | |
974 | save_access_regs(target->thread.acrs); | |
975 | ||
976 | if (kbuf) { | |
977 | compat_ulong_t *k = kbuf; | |
978 | while (count > 0) { | |
979 | *k++ = __peek_user_compat(target, pos); | |
980 | count -= sizeof(*k); | |
981 | pos += sizeof(*k); | |
982 | } | |
983 | } else { | |
984 | compat_ulong_t __user *u = ubuf; | |
985 | while (count > 0) { | |
986 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
987 | return -EFAULT; | |
988 | count -= sizeof(*u); | |
989 | pos += sizeof(*u); | |
990 | } | |
991 | } | |
992 | return 0; | |
993 | } | |
994 | ||
995 | static int s390_compat_regs_set(struct task_struct *target, | |
996 | const struct user_regset *regset, | |
997 | unsigned int pos, unsigned int count, | |
998 | const void *kbuf, const void __user *ubuf) | |
999 | { | |
1000 | int rc = 0; | |
1001 | ||
1002 | if (target == current) | |
1003 | save_access_regs(target->thread.acrs); | |
1004 | ||
1005 | if (kbuf) { | |
1006 | const compat_ulong_t *k = kbuf; | |
1007 | while (count > 0 && !rc) { | |
1008 | rc = __poke_user_compat(target, pos, *k++); | |
1009 | count -= sizeof(*k); | |
1010 | pos += sizeof(*k); | |
1011 | } | |
1012 | } else { | |
1013 | const compat_ulong_t __user *u = ubuf; | |
1014 | while (count > 0 && !rc) { | |
1015 | compat_ulong_t word; | |
1016 | rc = __get_user(word, u++); | |
1017 | if (rc) | |
1018 | break; | |
1019 | rc = __poke_user_compat(target, pos, word); | |
1020 | count -= sizeof(*u); | |
1021 | pos += sizeof(*u); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | if (rc == 0 && target == current) | |
1026 | restore_access_regs(target->thread.acrs); | |
1027 | ||
1028 | return rc; | |
1029 | } | |
1030 | ||
ea2a4d3a HC |
1031 | static int s390_compat_regs_high_get(struct task_struct *target, |
1032 | const struct user_regset *regset, | |
1033 | unsigned int pos, unsigned int count, | |
1034 | void *kbuf, void __user *ubuf) | |
1035 | { | |
1036 | compat_ulong_t *gprs_high; | |
1037 | ||
1038 | gprs_high = (compat_ulong_t *) | |
1039 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1040 | if (kbuf) { | |
1041 | compat_ulong_t *k = kbuf; | |
1042 | while (count > 0) { | |
1043 | *k++ = *gprs_high; | |
1044 | gprs_high += 2; | |
1045 | count -= sizeof(*k); | |
1046 | } | |
1047 | } else { | |
1048 | compat_ulong_t __user *u = ubuf; | |
1049 | while (count > 0) { | |
1050 | if (__put_user(*gprs_high, u++)) | |
1051 | return -EFAULT; | |
1052 | gprs_high += 2; | |
1053 | count -= sizeof(*u); | |
1054 | } | |
1055 | } | |
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1060 | const struct user_regset *regset, | |
1061 | unsigned int pos, unsigned int count, | |
1062 | const void *kbuf, const void __user *ubuf) | |
1063 | { | |
1064 | compat_ulong_t *gprs_high; | |
1065 | int rc = 0; | |
1066 | ||
1067 | gprs_high = (compat_ulong_t *) | |
1068 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1069 | if (kbuf) { | |
1070 | const compat_ulong_t *k = kbuf; | |
1071 | while (count > 0) { | |
1072 | *gprs_high = *k++; | |
1073 | *gprs_high += 2; | |
1074 | count -= sizeof(*k); | |
1075 | } | |
1076 | } else { | |
1077 | const compat_ulong_t __user *u = ubuf; | |
1078 | while (count > 0 && !rc) { | |
1079 | unsigned long word; | |
1080 | rc = __get_user(word, u++); | |
1081 | if (rc) | |
1082 | break; | |
1083 | *gprs_high = word; | |
1084 | *gprs_high += 2; | |
1085 | count -= sizeof(*u); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | return rc; | |
1090 | } | |
1091 | ||
86f2552b MS |
1092 | static int s390_compat_last_break_get(struct task_struct *target, |
1093 | const struct user_regset *regset, | |
1094 | unsigned int pos, unsigned int count, | |
1095 | void *kbuf, void __user *ubuf) | |
1096 | { | |
1097 | compat_ulong_t last_break; | |
1098 | ||
1099 | if (count > 0) { | |
1100 | last_break = task_thread_info(target)->last_break; | |
1101 | if (kbuf) { | |
1102 | unsigned long *k = kbuf; | |
1103 | *k = last_break; | |
1104 | } else { | |
1105 | unsigned long __user *u = ubuf; | |
1106 | if (__put_user(last_break, u)) | |
1107 | return -EFAULT; | |
1108 | } | |
1109 | } | |
1110 | return 0; | |
1111 | } | |
1112 | ||
b934069c MS |
1113 | static int s390_compat_last_break_set(struct task_struct *target, |
1114 | const struct user_regset *regset, | |
1115 | unsigned int pos, unsigned int count, | |
1116 | const void *kbuf, const void __user *ubuf) | |
1117 | { | |
1118 | return 0; | |
1119 | } | |
1120 | ||
63506c41 MS |
1121 | static const struct user_regset s390_compat_regsets[] = { |
1122 | [REGSET_GENERAL] = { | |
1123 | .core_note_type = NT_PRSTATUS, | |
1124 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1125 | .size = sizeof(compat_long_t), | |
1126 | .align = sizeof(compat_long_t), | |
1127 | .get = s390_compat_regs_get, | |
1128 | .set = s390_compat_regs_set, | |
1129 | }, | |
1130 | [REGSET_FP] = { | |
1131 | .core_note_type = NT_PRFPREG, | |
1132 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1133 | .size = sizeof(compat_long_t), | |
1134 | .align = sizeof(compat_long_t), | |
1135 | .get = s390_fpregs_get, | |
1136 | .set = s390_fpregs_set, | |
1137 | }, | |
86f2552b MS |
1138 | [REGSET_LAST_BREAK] = { |
1139 | .core_note_type = NT_S390_LAST_BREAK, | |
1140 | .n = 1, | |
1141 | .size = sizeof(long), | |
1142 | .align = sizeof(long), | |
1143 | .get = s390_compat_last_break_get, | |
b934069c | 1144 | .set = s390_compat_last_break_set, |
86f2552b | 1145 | }, |
20b40a79 MS |
1146 | [REGSET_SYSTEM_CALL] = { |
1147 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1148 | .n = 1, | |
1149 | .size = sizeof(compat_uint_t), | |
1150 | .align = sizeof(compat_uint_t), | |
1151 | .get = s390_system_call_get, | |
1152 | .set = s390_system_call_set, | |
1153 | }, | |
ea2a4d3a | 1154 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 1155 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1156 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1157 | .size = sizeof(compat_long_t), | |
1158 | .align = sizeof(compat_long_t), | |
1159 | .get = s390_compat_regs_high_get, | |
1160 | .set = s390_compat_regs_high_set, | |
1161 | }, | |
63506c41 MS |
1162 | }; |
1163 | ||
1164 | static const struct user_regset_view user_s390_compat_view = { | |
1165 | .name = "s390", | |
1166 | .e_machine = EM_S390, | |
1167 | .regsets = s390_compat_regsets, | |
1168 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1169 | }; | |
1170 | #endif | |
1171 | ||
1172 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1173 | { | |
1174 | #ifdef CONFIG_COMPAT | |
1175 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1176 | return &user_s390_compat_view; | |
1177 | #endif | |
1178 | return &user_s390_view; | |
1179 | } | |
952974ac HC |
1180 | |
1181 | static const char *gpr_names[NUM_GPRS] = { | |
1182 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1183 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1184 | }; | |
1185 | ||
1186 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1187 | { | |
1188 | if (offset >= NUM_GPRS) | |
1189 | return 0; | |
1190 | return regs->gprs[offset]; | |
1191 | } | |
1192 | ||
1193 | int regs_query_register_offset(const char *name) | |
1194 | { | |
1195 | unsigned long offset; | |
1196 | ||
1197 | if (!name || *name != 'r') | |
1198 | return -EINVAL; | |
1199 | if (strict_strtoul(name + 1, 10, &offset)) | |
1200 | return -EINVAL; | |
1201 | if (offset >= NUM_GPRS) | |
1202 | return -EINVAL; | |
1203 | return offset; | |
1204 | } | |
1205 | ||
1206 | const char *regs_query_register_name(unsigned int offset) | |
1207 | { | |
1208 | if (offset >= NUM_GPRS) | |
1209 | return NULL; | |
1210 | return gpr_names[offset]; | |
1211 | } | |
1212 | ||
1213 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1214 | { | |
1215 | unsigned long ksp = kernel_stack_pointer(regs); | |
1216 | ||
1217 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1218 | } | |
1219 | ||
1220 | /** | |
1221 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1222 | * @regs:pt_regs which contains kernel stack pointer. | |
1223 | * @n:stack entry number. | |
1224 | * | |
1225 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1226 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1227 | * this returns 0. | |
1228 | */ | |
1229 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1230 | { | |
1231 | unsigned long addr; | |
1232 | ||
1233 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1234 | if (!regs_within_kernel_stack(regs, addr)) | |
1235 | return 0; | |
1236 | return *(unsigned long *)addr; | |
1237 | } |