]>
Commit | Line | Data |
---|---|---|
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 | ||
5e9a2692 | 50 | void update_per_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) { | |
59 | unsigned long cr0, cr0_new; | |
60 | ||
61 | __ctl_store(cr0, 0, 0); | |
62 | /* set or clear transaction execution bits 8 and 9. */ | |
63 | if (task->thread.per_flags & PER_FLAG_NO_TE) | |
64 | cr0_new = cr0 & ~(3UL << 54); | |
65 | else | |
66 | cr0_new = cr0 | (3UL << 54); | |
67 | /* Only load control register 0 if necessary. */ | |
68 | if (cr0 != cr0_new) | |
69 | __ctl_load(cr0_new, 0, 0); | |
70 | } | |
66389e85 | 71 | #endif |
a45aff52 MS |
72 | /* Copy user specified PER registers */ |
73 | new.control = thread->per_user.control; | |
74 | new.start = thread->per_user.start; | |
75 | new.end = thread->per_user.end; | |
76 | ||
77 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
78 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { | |
79 | new.control |= PER_EVENT_IFETCH; | |
d35339a4 MS |
80 | #ifdef CONFIG_64BIT |
81 | new.control |= PER_CONTROL_SUSPENSION; | |
82 | new.control |= PER_EVENT_TRANSACTION_END; | |
83 | #endif | |
a45aff52 MS |
84 | new.start = 0; |
85 | new.end = PSW_ADDR_INSN; | |
86 | } | |
5e9a2692 MS |
87 | |
88 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 89 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 90 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 91 | return; |
c3311c13 | 92 | } |
5e9a2692 MS |
93 | regs->psw.mask |= PSW_MASK_PER; |
94 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
95 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
96 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
97 | } |
98 | ||
0ac30be4 | 99 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 100 | { |
5e9a2692 MS |
101 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
102 | if (task == current) | |
103 | update_per_regs(task); | |
1da177e4 LT |
104 | } |
105 | ||
0ac30be4 | 106 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 107 | { |
5e9a2692 MS |
108 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
109 | if (task == current) | |
110 | update_per_regs(task); | |
1da177e4 LT |
111 | } |
112 | ||
113 | /* | |
114 | * Called by kernel/ptrace.c when detaching.. | |
115 | * | |
5e9a2692 | 116 | * Clear all debugging related fields. |
1da177e4 | 117 | */ |
5e9a2692 | 118 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 119 | { |
5e9a2692 MS |
120 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
121 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
122 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
123 | clear_tsk_thread_flag(task, TIF_PER_TRAP); | |
d35339a4 | 124 | task->thread.per_flags = 0; |
1da177e4 LT |
125 | } |
126 | ||
347a8dc3 | 127 | #ifndef CONFIG_64BIT |
1da177e4 LT |
128 | # define __ADDR_MASK 3 |
129 | #else | |
130 | # define __ADDR_MASK 7 | |
131 | #endif | |
132 | ||
5e9a2692 MS |
133 | static inline unsigned long __peek_user_per(struct task_struct *child, |
134 | addr_t addr) | |
135 | { | |
136 | struct per_struct_kernel *dummy = NULL; | |
137 | ||
138 | if (addr == (addr_t) &dummy->cr9) | |
139 | /* Control bits of the active per set. */ | |
140 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
141 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
142 | else if (addr == (addr_t) &dummy->cr10) | |
143 | /* Start address of the active per set. */ | |
144 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
145 | 0 : child->thread.per_user.start; | |
146 | else if (addr == (addr_t) &dummy->cr11) | |
147 | /* End address of the active per set. */ | |
148 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
149 | PSW_ADDR_INSN : child->thread.per_user.end; | |
150 | else if (addr == (addr_t) &dummy->bits) | |
151 | /* Single-step bit. */ | |
152 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
153 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
154 | else if (addr == (addr_t) &dummy->starting_addr) | |
155 | /* Start address of the user specified per set. */ | |
156 | return child->thread.per_user.start; | |
157 | else if (addr == (addr_t) &dummy->ending_addr) | |
158 | /* End address of the user specified per set. */ | |
159 | return child->thread.per_user.end; | |
160 | else if (addr == (addr_t) &dummy->perc_atmid) | |
161 | /* PER code, ATMID and AI of the last PER trap */ | |
162 | return (unsigned long) | |
163 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
164 | else if (addr == (addr_t) &dummy->address) | |
165 | /* Address of the last PER trap */ | |
166 | return child->thread.per_event.address; | |
167 | else if (addr == (addr_t) &dummy->access_id) | |
168 | /* Access id of the last PER trap */ | |
169 | return (unsigned long) | |
170 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
171 | return 0; | |
172 | } | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * Read the word at offset addr from the user area of a process. The | |
176 | * trouble here is that the information is littered over different | |
177 | * locations. The process registers are found on the kernel stack, | |
178 | * the floating point stuff and the trace settings are stored in | |
179 | * the task structure. In addition the different structures in | |
180 | * struct user contain pad bytes that should be read as zeroes. | |
181 | * Lovely... | |
182 | */ | |
63506c41 | 183 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
184 | { |
185 | struct user *dummy = NULL; | |
63506c41 | 186 | addr_t offset, tmp; |
1da177e4 LT |
187 | |
188 | if (addr < (addr_t) &dummy->regs.acrs) { | |
189 | /* | |
190 | * psw and gprs are stored on the stack | |
191 | */ | |
c7584fb6 | 192 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 | 193 | if (addr == (addr_t) &dummy->regs.psw.mask) |
b50511e4 | 194 | /* Return a clean psw mask. */ |
d4e81b35 | 195 | tmp = psw_user_bits | (tmp & PSW_MASK_USER); |
1da177e4 LT |
196 | |
197 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
198 | /* | |
199 | * access registers are stored in the thread structure | |
200 | */ | |
201 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 202 | #ifdef CONFIG_64BIT |
778959db MS |
203 | /* |
204 | * Very special case: old & broken 64 bit gdb reading | |
205 | * from acrs[15]. Result is a 64 bit value. Read the | |
206 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
207 | */ | |
208 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
209 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
210 | else | |
211 | #endif | |
1da177e4 LT |
212 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
213 | ||
214 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
215 | /* | |
216 | * orig_gpr2 is stored on the kernel stack | |
217 | */ | |
c7584fb6 | 218 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 219 | |
3d6e48f4 JW |
220 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
221 | /* | |
222 | * prevent reads of padding hole between | |
223 | * orig_gpr2 and fp_regs on s390. | |
224 | */ | |
225 | tmp = 0; | |
226 | ||
1da177e4 LT |
227 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
228 | /* | |
229 | * floating point regs. are stored in the thread structure | |
230 | */ | |
231 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
232 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
233 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
234 | tmp &= (unsigned long) FPC_VALID_MASK | |
235 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
236 | |
237 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
238 | /* | |
5e9a2692 | 239 | * Handle access to the per_info structure. |
1da177e4 | 240 | */ |
5e9a2692 MS |
241 | addr -= (addr_t) &dummy->regs.per_info; |
242 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
243 | |
244 | } else | |
245 | tmp = 0; | |
246 | ||
63506c41 | 247 | return tmp; |
1da177e4 LT |
248 | } |
249 | ||
1da177e4 | 250 | static int |
63506c41 | 251 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 252 | { |
63506c41 | 253 | addr_t tmp, mask; |
1da177e4 LT |
254 | |
255 | /* | |
256 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 257 | * an alignment of 4. Programmers from hell... |
1da177e4 | 258 | */ |
778959db | 259 | mask = __ADDR_MASK; |
347a8dc3 | 260 | #ifdef CONFIG_64BIT |
547e3cec MS |
261 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
262 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
263 | mask = 3; |
264 | #endif | |
265 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
266 | return -EIO; |
267 | ||
63506c41 MS |
268 | tmp = __peek_user(child, addr); |
269 | return put_user(tmp, (addr_t __user *) data); | |
270 | } | |
271 | ||
5e9a2692 MS |
272 | static inline void __poke_user_per(struct task_struct *child, |
273 | addr_t addr, addr_t data) | |
274 | { | |
275 | struct per_struct_kernel *dummy = NULL; | |
276 | ||
277 | /* | |
278 | * There are only three fields in the per_info struct that the | |
279 | * debugger user can write to. | |
280 | * 1) cr9: the debugger wants to set a new PER event mask | |
281 | * 2) starting_addr: the debugger wants to set a new starting | |
282 | * address to use with the PER event mask. | |
283 | * 3) ending_addr: the debugger wants to set a new ending | |
284 | * address to use with the PER event mask. | |
285 | * The user specified PER event mask and the start and end | |
286 | * addresses are used only if single stepping is not in effect. | |
287 | * Writes to any other field in per_info are ignored. | |
288 | */ | |
289 | if (addr == (addr_t) &dummy->cr9) | |
290 | /* PER event mask of the user specified per set. */ | |
291 | child->thread.per_user.control = | |
292 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
293 | else if (addr == (addr_t) &dummy->starting_addr) | |
294 | /* Starting address of the user specified per set. */ | |
295 | child->thread.per_user.start = data; | |
296 | else if (addr == (addr_t) &dummy->ending_addr) | |
297 | /* Ending address of the user specified per set. */ | |
298 | child->thread.per_user.end = data; | |
299 | } | |
300 | ||
63506c41 MS |
301 | /* |
302 | * Write a word to the user area of a process at location addr. This | |
303 | * operation does have an additional problem compared to peek_user. | |
304 | * Stores to the program status word and on the floating point | |
305 | * control register needs to get checked for validity. | |
306 | */ | |
307 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
308 | { | |
309 | struct user *dummy = NULL; | |
d4e81b35 | 310 | addr_t offset; |
63506c41 | 311 | |
1da177e4 LT |
312 | if (addr < (addr_t) &dummy->regs.acrs) { |
313 | /* | |
314 | * psw and gprs are stored on the stack | |
315 | */ | |
316 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
d4e81b35 MS |
317 | ((data & ~PSW_MASK_USER) != psw_user_bits || |
318 | ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)))) | |
1da177e4 LT |
319 | /* Invalid psw mask. */ |
320 | return -EINVAL; | |
c7584fb6 | 321 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
322 | |
323 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
324 | /* | |
325 | * access registers are stored in the thread structure | |
326 | */ | |
327 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 328 | #ifdef CONFIG_64BIT |
778959db MS |
329 | /* |
330 | * Very special case: old & broken 64 bit gdb writing | |
331 | * to acrs[15] with a 64 bit value. Ignore the lower | |
332 | * half of the value and write the upper 32 bit to | |
333 | * acrs[15]. Sick... | |
334 | */ | |
335 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
336 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
337 | else | |
338 | #endif | |
1da177e4 LT |
339 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
340 | ||
341 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
342 | /* | |
343 | * orig_gpr2 is stored on the kernel stack | |
344 | */ | |
c7584fb6 | 345 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 346 | |
3d6e48f4 JW |
347 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
348 | /* | |
349 | * prevent writes of padding hole between | |
350 | * orig_gpr2 and fp_regs on s390. | |
351 | */ | |
352 | return 0; | |
353 | ||
1da177e4 LT |
354 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
355 | /* | |
356 | * floating point regs. are stored in the thread structure | |
357 | */ | |
358 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
359 | (data & ~((unsigned long) FPC_VALID_MASK |
360 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
361 | return -EINVAL; |
362 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
363 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
364 | ||
365 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
366 | /* | |
5e9a2692 | 367 | * Handle access to the per_info structure. |
1da177e4 | 368 | */ |
5e9a2692 MS |
369 | addr -= (addr_t) &dummy->regs.per_info; |
370 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
371 | |
372 | } | |
373 | ||
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | ||
5e9a2692 | 377 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 378 | { |
63506c41 MS |
379 | addr_t mask; |
380 | ||
381 | /* | |
382 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
383 | * an alignment of 4. Programmers from hell indeed... | |
384 | */ | |
385 | mask = __ADDR_MASK; | |
386 | #ifdef CONFIG_64BIT | |
547e3cec MS |
387 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
388 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
389 | mask = 3; |
390 | #endif | |
391 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
392 | return -EIO; | |
393 | ||
394 | return __poke_user(child, addr, data); | |
395 | } | |
396 | ||
9b05a69e NK |
397 | long arch_ptrace(struct task_struct *child, long request, |
398 | unsigned long addr, unsigned long data) | |
1da177e4 | 399 | { |
1da177e4 LT |
400 | ptrace_area parea; |
401 | int copied, ret; | |
402 | ||
403 | switch (request) { | |
1da177e4 LT |
404 | case PTRACE_PEEKUSR: |
405 | /* read the word at location addr in the USER area. */ | |
406 | return peek_user(child, addr, data); | |
407 | ||
1da177e4 LT |
408 | case PTRACE_POKEUSR: |
409 | /* write the word at location addr in the USER area */ | |
410 | return poke_user(child, addr, data); | |
411 | ||
412 | case PTRACE_PEEKUSR_AREA: | |
413 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 414 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
415 | sizeof(parea))) |
416 | return -EFAULT; | |
417 | addr = parea.kernel_addr; | |
418 | data = parea.process_addr; | |
419 | copied = 0; | |
420 | while (copied < parea.len) { | |
421 | if (request == PTRACE_PEEKUSR_AREA) | |
422 | ret = peek_user(child, addr, data); | |
423 | else { | |
2b67fc46 HC |
424 | addr_t utmp; |
425 | if (get_user(utmp, | |
426 | (addr_t __force __user *) data)) | |
1da177e4 | 427 | return -EFAULT; |
2b67fc46 | 428 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
429 | } |
430 | if (ret) | |
431 | return ret; | |
432 | addr += sizeof(unsigned long); | |
433 | data += sizeof(unsigned long); | |
434 | copied += sizeof(unsigned long); | |
435 | } | |
436 | return 0; | |
86f2552b MS |
437 | case PTRACE_GET_LAST_BREAK: |
438 | put_user(task_thread_info(child)->last_break, | |
439 | (unsigned long __user *) data); | |
440 | return 0; | |
d35339a4 MS |
441 | case PTRACE_ENABLE_TE: |
442 | if (!MACHINE_HAS_TE) | |
443 | return -EIO; | |
444 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
445 | return 0; | |
446 | case PTRACE_DISABLE_TE: | |
447 | if (!MACHINE_HAS_TE) | |
448 | return -EIO; | |
449 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
450 | return 0; | |
07805ac8 CB |
451 | default: |
452 | /* Removing high order bit from addr (only for 31 bit). */ | |
453 | addr &= PSW_ADDR_INSN; | |
454 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 455 | } |
1da177e4 LT |
456 | } |
457 | ||
347a8dc3 | 458 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
459 | /* |
460 | * Now the fun part starts... a 31 bit program running in the | |
461 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
462 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
463 | * to handle, the difference to the 64 bit versions of the requests | |
464 | * is that the access is done in multiples of 4 byte instead of | |
465 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
466 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
467 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
468 | * is a 31 bit program too, the content of struct user can be | |
469 | * emulated. A 31 bit program peeking into the struct user of | |
470 | * a 64 bit program is a no-no. | |
471 | */ | |
472 | ||
5e9a2692 MS |
473 | /* |
474 | * Same as peek_user_per but for a 31 bit program. | |
475 | */ | |
476 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
477 | addr_t addr) | |
478 | { | |
479 | struct compat_per_struct_kernel *dummy32 = NULL; | |
480 | ||
481 | if (addr == (addr_t) &dummy32->cr9) | |
482 | /* Control bits of the active per set. */ | |
483 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
484 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
485 | else if (addr == (addr_t) &dummy32->cr10) | |
486 | /* Start address of the active per set. */ | |
487 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
488 | 0 : child->thread.per_user.start; | |
489 | else if (addr == (addr_t) &dummy32->cr11) | |
490 | /* End address of the active per set. */ | |
491 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
492 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
493 | else if (addr == (addr_t) &dummy32->bits) | |
494 | /* Single-step bit. */ | |
495 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
496 | 0x80000000 : 0; | |
497 | else if (addr == (addr_t) &dummy32->starting_addr) | |
498 | /* Start address of the user specified per set. */ | |
499 | return (__u32) child->thread.per_user.start; | |
500 | else if (addr == (addr_t) &dummy32->ending_addr) | |
501 | /* End address of the user specified per set. */ | |
502 | return (__u32) child->thread.per_user.end; | |
503 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
504 | /* PER code, ATMID and AI of the last PER trap */ | |
505 | return (__u32) child->thread.per_event.cause << 16; | |
506 | else if (addr == (addr_t) &dummy32->address) | |
507 | /* Address of the last PER trap */ | |
508 | return (__u32) child->thread.per_event.address; | |
509 | else if (addr == (addr_t) &dummy32->access_id) | |
510 | /* Access id of the last PER trap */ | |
511 | return (__u32) child->thread.per_event.paid << 24; | |
512 | return 0; | |
513 | } | |
514 | ||
1da177e4 LT |
515 | /* |
516 | * Same as peek_user but for a 31 bit program. | |
517 | */ | |
63506c41 | 518 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 519 | { |
5e9a2692 | 520 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
521 | addr_t offset; |
522 | __u32 tmp; | |
523 | ||
1da177e4 | 524 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 525 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
526 | /* |
527 | * psw and gprs are stored on the stack | |
528 | */ | |
529 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
530 | /* Fake a 31 bit psw mask. */ | |
b50511e4 MS |
531 | tmp = (__u32)(regs->psw.mask >> 32); |
532 | tmp = psw32_user_bits | (tmp & PSW32_MASK_USER); | |
1da177e4 LT |
533 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
534 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
535 | tmp = (__u32) regs->psw.addr | |
536 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
537 | } else { |
538 | /* gpr 0-15 */ | |
b50511e4 | 539 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
540 | } |
541 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
542 | /* | |
543 | * access registers are stored in the thread structure | |
544 | */ | |
545 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
546 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
547 | ||
548 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
549 | /* | |
550 | * orig_gpr2 is stored on the kernel stack | |
551 | */ | |
c7584fb6 | 552 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 553 | |
3d6e48f4 JW |
554 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
555 | /* | |
556 | * prevent reads of padding hole between | |
557 | * orig_gpr2 and fp_regs on s390. | |
558 | */ | |
559 | tmp = 0; | |
560 | ||
1da177e4 LT |
561 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
562 | /* | |
563 | * floating point regs. are stored in the thread structure | |
564 | */ | |
565 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
566 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
567 | ||
568 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
569 | /* | |
5e9a2692 | 570 | * Handle access to the per_info structure. |
1da177e4 | 571 | */ |
5e9a2692 MS |
572 | addr -= (addr_t) &dummy32->regs.per_info; |
573 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
574 | |
575 | } else | |
576 | tmp = 0; | |
577 | ||
63506c41 MS |
578 | return tmp; |
579 | } | |
580 | ||
581 | static int peek_user_compat(struct task_struct *child, | |
582 | addr_t addr, addr_t data) | |
583 | { | |
584 | __u32 tmp; | |
585 | ||
7757591a | 586 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
587 | return -EIO; |
588 | ||
589 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
590 | return put_user(tmp, (__u32 __user *) data); |
591 | } | |
592 | ||
5e9a2692 MS |
593 | /* |
594 | * Same as poke_user_per but for a 31 bit program. | |
595 | */ | |
596 | static inline void __poke_user_per_compat(struct task_struct *child, | |
597 | addr_t addr, __u32 data) | |
598 | { | |
599 | struct compat_per_struct_kernel *dummy32 = NULL; | |
600 | ||
601 | if (addr == (addr_t) &dummy32->cr9) | |
602 | /* PER event mask of the user specified per set. */ | |
603 | child->thread.per_user.control = | |
604 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
605 | else if (addr == (addr_t) &dummy32->starting_addr) | |
606 | /* Starting address of the user specified per set. */ | |
607 | child->thread.per_user.start = data; | |
608 | else if (addr == (addr_t) &dummy32->ending_addr) | |
609 | /* Ending address of the user specified per set. */ | |
610 | child->thread.per_user.end = data; | |
611 | } | |
612 | ||
1da177e4 LT |
613 | /* |
614 | * Same as poke_user but for a 31 bit program. | |
615 | */ | |
63506c41 MS |
616 | static int __poke_user_compat(struct task_struct *child, |
617 | addr_t addr, addr_t data) | |
1da177e4 | 618 | { |
5e9a2692 | 619 | struct compat_user *dummy32 = NULL; |
63506c41 | 620 | __u32 tmp = (__u32) data; |
1da177e4 | 621 | addr_t offset; |
1da177e4 LT |
622 | |
623 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 624 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
625 | /* |
626 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
627 | */ | |
628 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
629 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
b50511e4 | 630 | if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits) |
1da177e4 LT |
631 | /* Invalid psw mask. */ |
632 | return -EINVAL; | |
b50511e4 | 633 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 634 | (regs->psw.mask & PSW_MASK_BA) | |
b50511e4 | 635 | (__u64)(tmp & PSW32_MASK_USER) << 32; |
1da177e4 LT |
636 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
637 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 638 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
639 | /* Transfer 31 bit amode bit to psw mask. */ |
640 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
641 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
642 | } else { |
643 | /* gpr 0-15 */ | |
b50511e4 | 644 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
645 | } |
646 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
647 | /* | |
648 | * access registers are stored in the thread structure | |
649 | */ | |
650 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
651 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
652 | ||
653 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
654 | /* | |
655 | * orig_gpr2 is stored on the kernel stack | |
656 | */ | |
c7584fb6 | 657 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 658 | |
3d6e48f4 JW |
659 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
660 | /* | |
661 | * prevent writess of padding hole between | |
662 | * orig_gpr2 and fp_regs on s390. | |
663 | */ | |
664 | return 0; | |
665 | ||
1da177e4 LT |
666 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
667 | /* | |
668 | * floating point regs. are stored in the thread structure | |
669 | */ | |
670 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
671 | (tmp & ~FPC_VALID_MASK) != 0) | |
672 | /* Invalid floating point control. */ | |
673 | return -EINVAL; | |
674 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
675 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
676 | ||
677 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
678 | /* | |
5e9a2692 | 679 | * Handle access to the per_info structure. |
1da177e4 | 680 | */ |
5e9a2692 MS |
681 | addr -= (addr_t) &dummy32->regs.per_info; |
682 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
683 | } |
684 | ||
1da177e4 LT |
685 | return 0; |
686 | } | |
687 | ||
63506c41 MS |
688 | static int poke_user_compat(struct task_struct *child, |
689 | addr_t addr, addr_t data) | |
690 | { | |
5e9a2692 MS |
691 | if (!is_compat_task() || (addr & 3) || |
692 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
693 | return -EIO; |
694 | ||
695 | return __poke_user_compat(child, addr, data); | |
696 | } | |
697 | ||
b499d76b RM |
698 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
699 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 700 | { |
b499d76b RM |
701 | unsigned long addr = caddr; |
702 | unsigned long data = cdata; | |
5e9a2692 | 703 | compat_ptrace_area parea; |
1da177e4 LT |
704 | int copied, ret; |
705 | ||
706 | switch (request) { | |
1da177e4 LT |
707 | case PTRACE_PEEKUSR: |
708 | /* read the word at location addr in the USER area. */ | |
63506c41 | 709 | return peek_user_compat(child, addr, data); |
1da177e4 | 710 | |
1da177e4 LT |
711 | case PTRACE_POKEUSR: |
712 | /* write the word at location addr in the USER area */ | |
63506c41 | 713 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
714 | |
715 | case PTRACE_PEEKUSR_AREA: | |
716 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 717 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
718 | sizeof(parea))) |
719 | return -EFAULT; | |
720 | addr = parea.kernel_addr; | |
721 | data = parea.process_addr; | |
722 | copied = 0; | |
723 | while (copied < parea.len) { | |
724 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 725 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 726 | else { |
2b67fc46 HC |
727 | __u32 utmp; |
728 | if (get_user(utmp, | |
729 | (__u32 __force __user *) data)) | |
1da177e4 | 730 | return -EFAULT; |
63506c41 | 731 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
732 | } |
733 | if (ret) | |
734 | return ret; | |
735 | addr += sizeof(unsigned int); | |
736 | data += sizeof(unsigned int); | |
737 | copied += sizeof(unsigned int); | |
738 | } | |
739 | return 0; | |
86f2552b MS |
740 | case PTRACE_GET_LAST_BREAK: |
741 | put_user(task_thread_info(child)->last_break, | |
742 | (unsigned int __user *) data); | |
743 | return 0; | |
1da177e4 | 744 | } |
b499d76b | 745 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
746 | } |
747 | #endif | |
748 | ||
753c4dd6 | 749 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 750 | { |
545c174d | 751 | long ret = 0; |
1da177e4 | 752 | |
bcf5cef7 | 753 | /* Do the secure computing check first. */ |
c63cb468 HC |
754 | if (secure_computing(regs->gprs[2])) { |
755 | /* seccomp failures shouldn't expose any additional code. */ | |
756 | ret = -1; | |
757 | goto out; | |
758 | } | |
bcf5cef7 | 759 | |
c5c3a6d8 | 760 | /* |
753c4dd6 MS |
761 | * The sysc_tracesys code in entry.S stored the system |
762 | * call number to gprs[2]. | |
c5c3a6d8 | 763 | */ |
753c4dd6 MS |
764 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
765 | (tracehook_report_syscall_entry(regs) || | |
766 | regs->gprs[2] >= NR_syscalls)) { | |
767 | /* | |
768 | * Tracing decided this syscall should not happen or the | |
769 | * debugger stored an invalid system call number. Skip | |
770 | * the system call and the system call restart handling. | |
771 | */ | |
b6ef5bb3 | 772 | clear_thread_flag(TIF_SYSCALL); |
753c4dd6 | 773 | ret = -1; |
1da177e4 | 774 | } |
753c4dd6 | 775 | |
66700001 | 776 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 777 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 778 | |
b05d8447 EP |
779 | audit_syscall_entry(is_compat_task() ? |
780 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, | |
781 | regs->gprs[2], regs->orig_gpr2, | |
782 | regs->gprs[3], regs->gprs[4], | |
783 | regs->gprs[5]); | |
c63cb468 | 784 | out: |
545c174d | 785 | return ret ?: regs->gprs[2]; |
753c4dd6 MS |
786 | } |
787 | ||
788 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
789 | { | |
d7e7528b | 790 | audit_syscall_exit(regs); |
753c4dd6 | 791 | |
66700001 | 792 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 793 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 794 | |
753c4dd6 MS |
795 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
796 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 797 | } |
63506c41 MS |
798 | |
799 | /* | |
800 | * user_regset definitions. | |
801 | */ | |
802 | ||
803 | static int s390_regs_get(struct task_struct *target, | |
804 | const struct user_regset *regset, | |
805 | unsigned int pos, unsigned int count, | |
806 | void *kbuf, void __user *ubuf) | |
807 | { | |
808 | if (target == current) | |
809 | save_access_regs(target->thread.acrs); | |
810 | ||
811 | if (kbuf) { | |
812 | unsigned long *k = kbuf; | |
813 | while (count > 0) { | |
814 | *k++ = __peek_user(target, pos); | |
815 | count -= sizeof(*k); | |
816 | pos += sizeof(*k); | |
817 | } | |
818 | } else { | |
819 | unsigned long __user *u = ubuf; | |
820 | while (count > 0) { | |
821 | if (__put_user(__peek_user(target, pos), u++)) | |
822 | return -EFAULT; | |
823 | count -= sizeof(*u); | |
824 | pos += sizeof(*u); | |
825 | } | |
826 | } | |
827 | return 0; | |
828 | } | |
829 | ||
830 | static int s390_regs_set(struct task_struct *target, | |
831 | const struct user_regset *regset, | |
832 | unsigned int pos, unsigned int count, | |
833 | const void *kbuf, const void __user *ubuf) | |
834 | { | |
835 | int rc = 0; | |
836 | ||
837 | if (target == current) | |
838 | save_access_regs(target->thread.acrs); | |
839 | ||
840 | if (kbuf) { | |
841 | const unsigned long *k = kbuf; | |
842 | while (count > 0 && !rc) { | |
843 | rc = __poke_user(target, pos, *k++); | |
844 | count -= sizeof(*k); | |
845 | pos += sizeof(*k); | |
846 | } | |
847 | } else { | |
848 | const unsigned long __user *u = ubuf; | |
849 | while (count > 0 && !rc) { | |
850 | unsigned long word; | |
851 | rc = __get_user(word, u++); | |
852 | if (rc) | |
853 | break; | |
854 | rc = __poke_user(target, pos, word); | |
855 | count -= sizeof(*u); | |
856 | pos += sizeof(*u); | |
857 | } | |
858 | } | |
859 | ||
860 | if (rc == 0 && target == current) | |
861 | restore_access_regs(target->thread.acrs); | |
862 | ||
863 | return rc; | |
864 | } | |
865 | ||
866 | static int s390_fpregs_get(struct task_struct *target, | |
867 | const struct user_regset *regset, unsigned int pos, | |
868 | unsigned int count, void *kbuf, void __user *ubuf) | |
869 | { | |
870 | if (target == current) | |
871 | save_fp_regs(&target->thread.fp_regs); | |
872 | ||
873 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
874 | &target->thread.fp_regs, 0, -1); | |
875 | } | |
876 | ||
877 | static int s390_fpregs_set(struct task_struct *target, | |
878 | const struct user_regset *regset, unsigned int pos, | |
879 | unsigned int count, const void *kbuf, | |
880 | const void __user *ubuf) | |
881 | { | |
882 | int rc = 0; | |
883 | ||
884 | if (target == current) | |
885 | save_fp_regs(&target->thread.fp_regs); | |
886 | ||
887 | /* If setting FPC, must validate it first. */ | |
888 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
889 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
890 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
891 | 0, offsetof(s390_fp_regs, fprs)); | |
892 | if (rc) | |
893 | return rc; | |
894 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
895 | return -EINVAL; | |
896 | target->thread.fp_regs.fpc = fpc[0]; | |
897 | } | |
898 | ||
899 | if (rc == 0 && count > 0) | |
900 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
901 | target->thread.fp_regs.fprs, | |
902 | offsetof(s390_fp_regs, fprs), -1); | |
903 | ||
904 | if (rc == 0 && target == current) | |
905 | restore_fp_regs(&target->thread.fp_regs); | |
906 | ||
907 | return rc; | |
908 | } | |
909 | ||
86f2552b MS |
910 | #ifdef CONFIG_64BIT |
911 | ||
912 | static int s390_last_break_get(struct task_struct *target, | |
913 | const struct user_regset *regset, | |
914 | unsigned int pos, unsigned int count, | |
915 | void *kbuf, void __user *ubuf) | |
916 | { | |
917 | if (count > 0) { | |
918 | if (kbuf) { | |
919 | unsigned long *k = kbuf; | |
920 | *k = task_thread_info(target)->last_break; | |
921 | } else { | |
922 | unsigned long __user *u = ubuf; | |
923 | if (__put_user(task_thread_info(target)->last_break, u)) | |
924 | return -EFAULT; | |
925 | } | |
926 | } | |
927 | return 0; | |
928 | } | |
929 | ||
b934069c MS |
930 | static int s390_last_break_set(struct task_struct *target, |
931 | const struct user_regset *regset, | |
932 | unsigned int pos, unsigned int count, | |
933 | const void *kbuf, const void __user *ubuf) | |
934 | { | |
935 | return 0; | |
936 | } | |
937 | ||
d35339a4 MS |
938 | static int s390_tdb_get(struct task_struct *target, |
939 | const struct user_regset *regset, | |
940 | unsigned int pos, unsigned int count, | |
941 | void *kbuf, void __user *ubuf) | |
942 | { | |
943 | struct pt_regs *regs = task_pt_regs(target); | |
944 | unsigned char *data; | |
945 | ||
946 | if (!(regs->int_code & 0x200)) | |
947 | return -ENODATA; | |
948 | data = target->thread.trap_tdb; | |
949 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
950 | } | |
951 | ||
952 | static int s390_tdb_set(struct task_struct *target, | |
953 | const struct user_regset *regset, | |
954 | unsigned int pos, unsigned int count, | |
955 | const void *kbuf, const void __user *ubuf) | |
956 | { | |
957 | return 0; | |
958 | } | |
959 | ||
86f2552b MS |
960 | #endif |
961 | ||
20b40a79 MS |
962 | static int s390_system_call_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 | unsigned int *data = &task_thread_info(target)->system_call; | |
968 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
969 | data, 0, sizeof(unsigned int)); | |
970 | } | |
971 | ||
972 | static int s390_system_call_set(struct task_struct *target, | |
973 | const struct user_regset *regset, | |
974 | unsigned int pos, unsigned int count, | |
975 | const void *kbuf, const void __user *ubuf) | |
976 | { | |
977 | unsigned int *data = &task_thread_info(target)->system_call; | |
978 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
979 | data, 0, sizeof(unsigned int)); | |
980 | } | |
981 | ||
63506c41 MS |
982 | static const struct user_regset s390_regsets[] = { |
983 | [REGSET_GENERAL] = { | |
984 | .core_note_type = NT_PRSTATUS, | |
985 | .n = sizeof(s390_regs) / sizeof(long), | |
986 | .size = sizeof(long), | |
987 | .align = sizeof(long), | |
988 | .get = s390_regs_get, | |
989 | .set = s390_regs_set, | |
990 | }, | |
991 | [REGSET_FP] = { | |
992 | .core_note_type = NT_PRFPREG, | |
993 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
994 | .size = sizeof(long), | |
995 | .align = sizeof(long), | |
996 | .get = s390_fpregs_get, | |
997 | .set = s390_fpregs_set, | |
998 | }, | |
86f2552b MS |
999 | #ifdef CONFIG_64BIT |
1000 | [REGSET_LAST_BREAK] = { | |
1001 | .core_note_type = NT_S390_LAST_BREAK, | |
1002 | .n = 1, | |
1003 | .size = sizeof(long), | |
1004 | .align = sizeof(long), | |
1005 | .get = s390_last_break_get, | |
b934069c | 1006 | .set = s390_last_break_set, |
86f2552b | 1007 | }, |
d35339a4 MS |
1008 | [REGSET_TDB] = { |
1009 | .core_note_type = NT_S390_TDB, | |
1010 | .n = 1, | |
1011 | .size = 256, | |
1012 | .align = 1, | |
1013 | .get = s390_tdb_get, | |
1014 | .set = s390_tdb_set, | |
1015 | }, | |
86f2552b | 1016 | #endif |
20b40a79 MS |
1017 | [REGSET_SYSTEM_CALL] = { |
1018 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1019 | .n = 1, | |
1020 | .size = sizeof(unsigned int), | |
1021 | .align = sizeof(unsigned int), | |
1022 | .get = s390_system_call_get, | |
1023 | .set = s390_system_call_set, | |
1024 | }, | |
63506c41 MS |
1025 | }; |
1026 | ||
1027 | static const struct user_regset_view user_s390_view = { | |
1028 | .name = UTS_MACHINE, | |
1029 | .e_machine = EM_S390, | |
1030 | .regsets = s390_regsets, | |
1031 | .n = ARRAY_SIZE(s390_regsets) | |
1032 | }; | |
1033 | ||
1034 | #ifdef CONFIG_COMPAT | |
1035 | static int s390_compat_regs_get(struct task_struct *target, | |
1036 | const struct user_regset *regset, | |
1037 | unsigned int pos, unsigned int count, | |
1038 | void *kbuf, void __user *ubuf) | |
1039 | { | |
1040 | if (target == current) | |
1041 | save_access_regs(target->thread.acrs); | |
1042 | ||
1043 | if (kbuf) { | |
1044 | compat_ulong_t *k = kbuf; | |
1045 | while (count > 0) { | |
1046 | *k++ = __peek_user_compat(target, pos); | |
1047 | count -= sizeof(*k); | |
1048 | pos += sizeof(*k); | |
1049 | } | |
1050 | } else { | |
1051 | compat_ulong_t __user *u = ubuf; | |
1052 | while (count > 0) { | |
1053 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1054 | return -EFAULT; | |
1055 | count -= sizeof(*u); | |
1056 | pos += sizeof(*u); | |
1057 | } | |
1058 | } | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1062 | static int s390_compat_regs_set(struct task_struct *target, | |
1063 | const struct user_regset *regset, | |
1064 | unsigned int pos, unsigned int count, | |
1065 | const void *kbuf, const void __user *ubuf) | |
1066 | { | |
1067 | int rc = 0; | |
1068 | ||
1069 | if (target == current) | |
1070 | save_access_regs(target->thread.acrs); | |
1071 | ||
1072 | if (kbuf) { | |
1073 | const compat_ulong_t *k = kbuf; | |
1074 | while (count > 0 && !rc) { | |
1075 | rc = __poke_user_compat(target, pos, *k++); | |
1076 | count -= sizeof(*k); | |
1077 | pos += sizeof(*k); | |
1078 | } | |
1079 | } else { | |
1080 | const compat_ulong_t __user *u = ubuf; | |
1081 | while (count > 0 && !rc) { | |
1082 | compat_ulong_t word; | |
1083 | rc = __get_user(word, u++); | |
1084 | if (rc) | |
1085 | break; | |
1086 | rc = __poke_user_compat(target, pos, word); | |
1087 | count -= sizeof(*u); | |
1088 | pos += sizeof(*u); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | if (rc == 0 && target == current) | |
1093 | restore_access_regs(target->thread.acrs); | |
1094 | ||
1095 | return rc; | |
1096 | } | |
1097 | ||
ea2a4d3a HC |
1098 | static int s390_compat_regs_high_get(struct task_struct *target, |
1099 | const struct user_regset *regset, | |
1100 | unsigned int pos, unsigned int count, | |
1101 | void *kbuf, void __user *ubuf) | |
1102 | { | |
1103 | compat_ulong_t *gprs_high; | |
1104 | ||
1105 | gprs_high = (compat_ulong_t *) | |
1106 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1107 | if (kbuf) { | |
1108 | compat_ulong_t *k = kbuf; | |
1109 | while (count > 0) { | |
1110 | *k++ = *gprs_high; | |
1111 | gprs_high += 2; | |
1112 | count -= sizeof(*k); | |
1113 | } | |
1114 | } else { | |
1115 | compat_ulong_t __user *u = ubuf; | |
1116 | while (count > 0) { | |
1117 | if (__put_user(*gprs_high, u++)) | |
1118 | return -EFAULT; | |
1119 | gprs_high += 2; | |
1120 | count -= sizeof(*u); | |
1121 | } | |
1122 | } | |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1127 | const struct user_regset *regset, | |
1128 | unsigned int pos, unsigned int count, | |
1129 | const void *kbuf, const void __user *ubuf) | |
1130 | { | |
1131 | compat_ulong_t *gprs_high; | |
1132 | int rc = 0; | |
1133 | ||
1134 | gprs_high = (compat_ulong_t *) | |
1135 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1136 | if (kbuf) { | |
1137 | const compat_ulong_t *k = kbuf; | |
1138 | while (count > 0) { | |
1139 | *gprs_high = *k++; | |
1140 | *gprs_high += 2; | |
1141 | count -= sizeof(*k); | |
1142 | } | |
1143 | } else { | |
1144 | const compat_ulong_t __user *u = ubuf; | |
1145 | while (count > 0 && !rc) { | |
1146 | unsigned long word; | |
1147 | rc = __get_user(word, u++); | |
1148 | if (rc) | |
1149 | break; | |
1150 | *gprs_high = word; | |
1151 | *gprs_high += 2; | |
1152 | count -= sizeof(*u); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | return rc; | |
1157 | } | |
1158 | ||
86f2552b MS |
1159 | static int s390_compat_last_break_get(struct task_struct *target, |
1160 | const struct user_regset *regset, | |
1161 | unsigned int pos, unsigned int count, | |
1162 | void *kbuf, void __user *ubuf) | |
1163 | { | |
1164 | compat_ulong_t last_break; | |
1165 | ||
1166 | if (count > 0) { | |
1167 | last_break = task_thread_info(target)->last_break; | |
1168 | if (kbuf) { | |
1169 | unsigned long *k = kbuf; | |
1170 | *k = last_break; | |
1171 | } else { | |
1172 | unsigned long __user *u = ubuf; | |
1173 | if (__put_user(last_break, u)) | |
1174 | return -EFAULT; | |
1175 | } | |
1176 | } | |
1177 | return 0; | |
1178 | } | |
1179 | ||
b934069c MS |
1180 | static int s390_compat_last_break_set(struct task_struct *target, |
1181 | const struct user_regset *regset, | |
1182 | unsigned int pos, unsigned int count, | |
1183 | const void *kbuf, const void __user *ubuf) | |
1184 | { | |
1185 | return 0; | |
1186 | } | |
1187 | ||
63506c41 MS |
1188 | static const struct user_regset s390_compat_regsets[] = { |
1189 | [REGSET_GENERAL] = { | |
1190 | .core_note_type = NT_PRSTATUS, | |
1191 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1192 | .size = sizeof(compat_long_t), | |
1193 | .align = sizeof(compat_long_t), | |
1194 | .get = s390_compat_regs_get, | |
1195 | .set = s390_compat_regs_set, | |
1196 | }, | |
1197 | [REGSET_FP] = { | |
1198 | .core_note_type = NT_PRFPREG, | |
1199 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1200 | .size = sizeof(compat_long_t), | |
1201 | .align = sizeof(compat_long_t), | |
1202 | .get = s390_fpregs_get, | |
1203 | .set = s390_fpregs_set, | |
1204 | }, | |
86f2552b MS |
1205 | [REGSET_LAST_BREAK] = { |
1206 | .core_note_type = NT_S390_LAST_BREAK, | |
1207 | .n = 1, | |
1208 | .size = sizeof(long), | |
1209 | .align = sizeof(long), | |
1210 | .get = s390_compat_last_break_get, | |
b934069c | 1211 | .set = s390_compat_last_break_set, |
86f2552b | 1212 | }, |
d35339a4 MS |
1213 | [REGSET_TDB] = { |
1214 | .core_note_type = NT_S390_TDB, | |
1215 | .n = 1, | |
1216 | .size = 256, | |
1217 | .align = 1, | |
1218 | .get = s390_tdb_get, | |
1219 | .set = s390_tdb_set, | |
1220 | }, | |
20b40a79 MS |
1221 | [REGSET_SYSTEM_CALL] = { |
1222 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1223 | .n = 1, | |
1224 | .size = sizeof(compat_uint_t), | |
1225 | .align = sizeof(compat_uint_t), | |
1226 | .get = s390_system_call_get, | |
1227 | .set = s390_system_call_set, | |
1228 | }, | |
ea2a4d3a | 1229 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 1230 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1231 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1232 | .size = sizeof(compat_long_t), | |
1233 | .align = sizeof(compat_long_t), | |
1234 | .get = s390_compat_regs_high_get, | |
1235 | .set = s390_compat_regs_high_set, | |
1236 | }, | |
63506c41 MS |
1237 | }; |
1238 | ||
1239 | static const struct user_regset_view user_s390_compat_view = { | |
1240 | .name = "s390", | |
1241 | .e_machine = EM_S390, | |
1242 | .regsets = s390_compat_regsets, | |
1243 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1244 | }; | |
1245 | #endif | |
1246 | ||
1247 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1248 | { | |
1249 | #ifdef CONFIG_COMPAT | |
1250 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1251 | return &user_s390_compat_view; | |
1252 | #endif | |
1253 | return &user_s390_view; | |
1254 | } | |
952974ac HC |
1255 | |
1256 | static const char *gpr_names[NUM_GPRS] = { | |
1257 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1258 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1259 | }; | |
1260 | ||
1261 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1262 | { | |
1263 | if (offset >= NUM_GPRS) | |
1264 | return 0; | |
1265 | return regs->gprs[offset]; | |
1266 | } | |
1267 | ||
1268 | int regs_query_register_offset(const char *name) | |
1269 | { | |
1270 | unsigned long offset; | |
1271 | ||
1272 | if (!name || *name != 'r') | |
1273 | return -EINVAL; | |
1274 | if (strict_strtoul(name + 1, 10, &offset)) | |
1275 | return -EINVAL; | |
1276 | if (offset >= NUM_GPRS) | |
1277 | return -EINVAL; | |
1278 | return offset; | |
1279 | } | |
1280 | ||
1281 | const char *regs_query_register_name(unsigned int offset) | |
1282 | { | |
1283 | if (offset >= NUM_GPRS) | |
1284 | return NULL; | |
1285 | return gpr_names[offset]; | |
1286 | } | |
1287 | ||
1288 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1289 | { | |
1290 | unsigned long ksp = kernel_stack_pointer(regs); | |
1291 | ||
1292 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1293 | } | |
1294 | ||
1295 | /** | |
1296 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1297 | * @regs:pt_regs which contains kernel stack pointer. | |
1298 | * @n:stack entry number. | |
1299 | * | |
1300 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1301 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1302 | * this returns 0. | |
1303 | */ | |
1304 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1305 | { | |
1306 | unsigned long addr; | |
1307 | ||
1308 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1309 | if (!regs_within_kernel_stack(regs, addr)) | |
1310 | return 0; | |
1311 | return *(unsigned long *)addr; | |
1312 | } |