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Commit | Line | Data |
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1da177e4 | 1 | /* |
5e9a2692 | 2 | * Ptrace user space interface. |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2010 |
5e9a2692 | 5 | * Author(s): Denis Joseph Barrow |
1da177e4 | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/user.h> | |
16 | #include <linux/security.h> | |
17 | #include <linux/audit.h> | |
7ed20e1a | 18 | #include <linux/signal.h> |
63506c41 MS |
19 | #include <linux/elf.h> |
20 | #include <linux/regset.h> | |
753c4dd6 | 21 | #include <linux/tracehook.h> |
bcf5cef7 | 22 | #include <linux/seccomp.h> |
048cd4e5 | 23 | #include <linux/compat.h> |
9bf1226b | 24 | #include <trace/syscall.h> |
1da177e4 LT |
25 | #include <asm/segment.h> |
26 | #include <asm/page.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/pgalloc.h> | |
1da177e4 | 29 | #include <asm/uaccess.h> |
778959db | 30 | #include <asm/unistd.h> |
a0616cde | 31 | #include <asm/switch_to.h> |
a806170e | 32 | #include "entry.h" |
1da177e4 | 33 | |
347a8dc3 | 34 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
35 | #include "compat_ptrace.h" |
36 | #endif | |
37 | ||
1c569f02 JS |
38 | #define CREATE_TRACE_POINTS |
39 | #include <trace/events/syscalls.h> | |
5e9ad7df | 40 | |
63506c41 MS |
41 | enum s390_regset { |
42 | REGSET_GENERAL, | |
43 | REGSET_FP, | |
86f2552b | 44 | REGSET_LAST_BREAK, |
d35339a4 | 45 | REGSET_TDB, |
20b40a79 | 46 | REGSET_SYSTEM_CALL, |
ea2a4d3a | 47 | REGSET_GENERAL_EXTENDED, |
63506c41 MS |
48 | }; |
49 | ||
64597f9d | 50 | void update_cr_regs(struct task_struct *task) |
1da177e4 | 51 | { |
5e9a2692 MS |
52 | struct pt_regs *regs = task_pt_regs(task); |
53 | struct thread_struct *thread = &task->thread; | |
a45aff52 | 54 | struct per_regs old, new; |
5e9a2692 | 55 | |
66389e85 | 56 | #ifdef CONFIG_64BIT |
d35339a4 MS |
57 | /* Take care of the enable/disable of transactional execution. */ |
58 | if (MACHINE_HAS_TE) { | |
64597f9d | 59 | unsigned long cr[3], cr_new[3]; |
d35339a4 | 60 | |
64597f9d MM |
61 | __ctl_store(cr, 0, 2); |
62 | cr_new[1] = cr[1]; | |
0628a5fb | 63 | /* Set or clear transaction execution TXC bit 8. */ |
d35339a4 | 64 | if (task->thread.per_flags & PER_FLAG_NO_TE) |
0628a5fb | 65 | cr_new[0] = cr[0] & ~(1UL << 55); |
d35339a4 | 66 | else |
0628a5fb | 67 | cr_new[0] = cr[0] | (1UL << 55); |
64597f9d MM |
68 | /* Set or clear transaction execution TDC bits 62 and 63. */ |
69 | cr_new[2] = cr[2] & ~3UL; | |
70 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { | |
71 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) | |
72 | cr_new[2] |= 1UL; | |
73 | else | |
74 | cr_new[2] |= 2UL; | |
75 | } | |
76 | if (memcmp(&cr_new, &cr, sizeof(cr))) | |
77 | __ctl_load(cr_new, 0, 2); | |
d35339a4 | 78 | } |
66389e85 | 79 | #endif |
a45aff52 MS |
80 | /* Copy user specified PER registers */ |
81 | new.control = thread->per_user.control; | |
82 | new.start = thread->per_user.start; | |
83 | new.end = thread->per_user.end; | |
84 | ||
85 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
86 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP)) { | |
87 | new.control |= PER_EVENT_IFETCH; | |
d35339a4 MS |
88 | #ifdef CONFIG_64BIT |
89 | new.control |= PER_CONTROL_SUSPENSION; | |
90 | new.control |= PER_EVENT_TRANSACTION_END; | |
91 | #endif | |
a45aff52 MS |
92 | new.start = 0; |
93 | new.end = PSW_ADDR_INSN; | |
94 | } | |
5e9a2692 MS |
95 | |
96 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 97 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 98 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 99 | return; |
c3311c13 | 100 | } |
5e9a2692 MS |
101 | regs->psw.mask |= PSW_MASK_PER; |
102 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
103 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
104 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
105 | } |
106 | ||
0ac30be4 | 107 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 108 | { |
5e9a2692 | 109 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
110 | } |
111 | ||
0ac30be4 | 112 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 113 | { |
5e9a2692 | 114 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
115 | } |
116 | ||
117 | /* | |
118 | * Called by kernel/ptrace.c when detaching.. | |
119 | * | |
5e9a2692 | 120 | * Clear all debugging related fields. |
1da177e4 | 121 | */ |
5e9a2692 | 122 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 123 | { |
5e9a2692 MS |
124 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
125 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
126 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
127 | clear_tsk_thread_flag(task, TIF_PER_TRAP); | |
d35339a4 | 128 | task->thread.per_flags = 0; |
1da177e4 LT |
129 | } |
130 | ||
347a8dc3 | 131 | #ifndef CONFIG_64BIT |
1da177e4 LT |
132 | # define __ADDR_MASK 3 |
133 | #else | |
134 | # define __ADDR_MASK 7 | |
135 | #endif | |
136 | ||
5e9a2692 MS |
137 | static inline unsigned long __peek_user_per(struct task_struct *child, |
138 | addr_t addr) | |
139 | { | |
140 | struct per_struct_kernel *dummy = NULL; | |
141 | ||
142 | if (addr == (addr_t) &dummy->cr9) | |
143 | /* Control bits of the active per set. */ | |
144 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
145 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
146 | else if (addr == (addr_t) &dummy->cr10) | |
147 | /* Start address of the active per set. */ | |
148 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
149 | 0 : child->thread.per_user.start; | |
150 | else if (addr == (addr_t) &dummy->cr11) | |
151 | /* End address of the active per set. */ | |
152 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
153 | PSW_ADDR_INSN : child->thread.per_user.end; | |
154 | else if (addr == (addr_t) &dummy->bits) | |
155 | /* Single-step bit. */ | |
156 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
157 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
158 | else if (addr == (addr_t) &dummy->starting_addr) | |
159 | /* Start address of the user specified per set. */ | |
160 | return child->thread.per_user.start; | |
161 | else if (addr == (addr_t) &dummy->ending_addr) | |
162 | /* End address of the user specified per set. */ | |
163 | return child->thread.per_user.end; | |
164 | else if (addr == (addr_t) &dummy->perc_atmid) | |
165 | /* PER code, ATMID and AI of the last PER trap */ | |
166 | return (unsigned long) | |
167 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
168 | else if (addr == (addr_t) &dummy->address) | |
169 | /* Address of the last PER trap */ | |
170 | return child->thread.per_event.address; | |
171 | else if (addr == (addr_t) &dummy->access_id) | |
172 | /* Access id of the last PER trap */ | |
173 | return (unsigned long) | |
174 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
175 | return 0; | |
176 | } | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * Read the word at offset addr from the user area of a process. The | |
180 | * trouble here is that the information is littered over different | |
181 | * locations. The process registers are found on the kernel stack, | |
182 | * the floating point stuff and the trace settings are stored in | |
183 | * the task structure. In addition the different structures in | |
184 | * struct user contain pad bytes that should be read as zeroes. | |
185 | * Lovely... | |
186 | */ | |
63506c41 | 187 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
188 | { |
189 | struct user *dummy = NULL; | |
63506c41 | 190 | addr_t offset, tmp; |
1da177e4 LT |
191 | |
192 | if (addr < (addr_t) &dummy->regs.acrs) { | |
193 | /* | |
194 | * psw and gprs are stored on the stack | |
195 | */ | |
c7584fb6 | 196 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
5ebf250d | 197 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
b50511e4 | 198 | /* Return a clean psw mask. */ |
5ebf250d HC |
199 | tmp &= PSW_MASK_USER | PSW_MASK_RI; |
200 | tmp |= PSW_USER_BITS; | |
201 | } | |
1da177e4 LT |
202 | |
203 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
204 | /* | |
205 | * access registers are stored in the thread structure | |
206 | */ | |
207 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 208 | #ifdef CONFIG_64BIT |
778959db MS |
209 | /* |
210 | * Very special case: old & broken 64 bit gdb reading | |
211 | * from acrs[15]. Result is a 64 bit value. Read the | |
212 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
213 | */ | |
214 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
215 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
216 | else | |
217 | #endif | |
1da177e4 LT |
218 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
219 | ||
220 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
221 | /* | |
222 | * orig_gpr2 is stored on the kernel stack | |
223 | */ | |
c7584fb6 | 224 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 225 | |
3d6e48f4 JW |
226 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
227 | /* | |
228 | * prevent reads of padding hole between | |
229 | * orig_gpr2 and fp_regs on s390. | |
230 | */ | |
231 | tmp = 0; | |
232 | ||
1da177e4 LT |
233 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
234 | /* | |
235 | * floating point regs. are stored in the thread structure | |
236 | */ | |
237 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
238 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db | 239 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
4725c860 | 240 | tmp <<= BITS_PER_LONG - 32; |
1da177e4 LT |
241 | |
242 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
243 | /* | |
5e9a2692 | 244 | * Handle access to the per_info structure. |
1da177e4 | 245 | */ |
5e9a2692 MS |
246 | addr -= (addr_t) &dummy->regs.per_info; |
247 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
248 | |
249 | } else | |
250 | tmp = 0; | |
251 | ||
63506c41 | 252 | return tmp; |
1da177e4 LT |
253 | } |
254 | ||
1da177e4 | 255 | static int |
63506c41 | 256 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 257 | { |
63506c41 | 258 | addr_t tmp, mask; |
1da177e4 LT |
259 | |
260 | /* | |
261 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 262 | * an alignment of 4. Programmers from hell... |
1da177e4 | 263 | */ |
778959db | 264 | mask = __ADDR_MASK; |
347a8dc3 | 265 | #ifdef CONFIG_64BIT |
547e3cec MS |
266 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
267 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
268 | mask = 3; |
269 | #endif | |
270 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
271 | return -EIO; |
272 | ||
63506c41 MS |
273 | tmp = __peek_user(child, addr); |
274 | return put_user(tmp, (addr_t __user *) data); | |
275 | } | |
276 | ||
5e9a2692 MS |
277 | static inline void __poke_user_per(struct task_struct *child, |
278 | addr_t addr, addr_t data) | |
279 | { | |
280 | struct per_struct_kernel *dummy = NULL; | |
281 | ||
282 | /* | |
283 | * There are only three fields in the per_info struct that the | |
284 | * debugger user can write to. | |
285 | * 1) cr9: the debugger wants to set a new PER event mask | |
286 | * 2) starting_addr: the debugger wants to set a new starting | |
287 | * address to use with the PER event mask. | |
288 | * 3) ending_addr: the debugger wants to set a new ending | |
289 | * address to use with the PER event mask. | |
290 | * The user specified PER event mask and the start and end | |
291 | * addresses are used only if single stepping is not in effect. | |
292 | * Writes to any other field in per_info are ignored. | |
293 | */ | |
294 | if (addr == (addr_t) &dummy->cr9) | |
295 | /* PER event mask of the user specified per set. */ | |
296 | child->thread.per_user.control = | |
297 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
298 | else if (addr == (addr_t) &dummy->starting_addr) | |
299 | /* Starting address of the user specified per set. */ | |
300 | child->thread.per_user.start = data; | |
301 | else if (addr == (addr_t) &dummy->ending_addr) | |
302 | /* Ending address of the user specified per set. */ | |
303 | child->thread.per_user.end = data; | |
304 | } | |
305 | ||
63506c41 MS |
306 | /* |
307 | * Write a word to the user area of a process at location addr. This | |
308 | * operation does have an additional problem compared to peek_user. | |
309 | * Stores to the program status word and on the floating point | |
310 | * control register needs to get checked for validity. | |
311 | */ | |
312 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
313 | { | |
314 | struct user *dummy = NULL; | |
d4e81b35 | 315 | addr_t offset; |
63506c41 | 316 | |
1da177e4 LT |
317 | if (addr < (addr_t) &dummy->regs.acrs) { |
318 | /* | |
319 | * psw and gprs are stored on the stack | |
320 | */ | |
5ebf250d HC |
321 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
322 | unsigned long mask = PSW_MASK_USER; | |
323 | ||
324 | mask |= is_ri_task(child) ? PSW_MASK_RI : 0; | |
325 | if ((data & ~mask) != PSW_USER_BITS) | |
326 | return -EINVAL; | |
327 | if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)) | |
328 | return -EINVAL; | |
329 | } | |
c7584fb6 | 330 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
331 | |
332 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
333 | /* | |
334 | * access registers are stored in the thread structure | |
335 | */ | |
336 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 337 | #ifdef CONFIG_64BIT |
778959db MS |
338 | /* |
339 | * Very special case: old & broken 64 bit gdb writing | |
340 | * to acrs[15] with a 64 bit value. Ignore the lower | |
341 | * half of the value and write the upper 32 bit to | |
342 | * acrs[15]. Sick... | |
343 | */ | |
344 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
345 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
346 | else | |
347 | #endif | |
1da177e4 LT |
348 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
349 | ||
350 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
351 | /* | |
352 | * orig_gpr2 is stored on the kernel stack | |
353 | */ | |
c7584fb6 | 354 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 355 | |
3d6e48f4 JW |
356 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
357 | /* | |
358 | * prevent writes of padding hole between | |
359 | * orig_gpr2 and fp_regs on s390. | |
360 | */ | |
361 | return 0; | |
362 | ||
1da177e4 LT |
363 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
364 | /* | |
365 | * floating point regs. are stored in the thread structure | |
366 | */ | |
4725c860 MS |
367 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
368 | if ((unsigned int) data != 0 || | |
369 | test_fp_ctl(data >> (BITS_PER_LONG - 32))) | |
370 | return -EINVAL; | |
1da177e4 LT |
371 | offset = addr - (addr_t) &dummy->regs.fp_regs; |
372 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
373 | ||
374 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
375 | /* | |
5e9a2692 | 376 | * Handle access to the per_info structure. |
1da177e4 | 377 | */ |
5e9a2692 MS |
378 | addr -= (addr_t) &dummy->regs.per_info; |
379 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
380 | |
381 | } | |
382 | ||
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
5e9a2692 | 386 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 387 | { |
63506c41 MS |
388 | addr_t mask; |
389 | ||
390 | /* | |
391 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
392 | * an alignment of 4. Programmers from hell indeed... | |
393 | */ | |
394 | mask = __ADDR_MASK; | |
395 | #ifdef CONFIG_64BIT | |
547e3cec MS |
396 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
397 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
398 | mask = 3; |
399 | #endif | |
400 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
401 | return -EIO; | |
402 | ||
403 | return __poke_user(child, addr, data); | |
404 | } | |
405 | ||
9b05a69e NK |
406 | long arch_ptrace(struct task_struct *child, long request, |
407 | unsigned long addr, unsigned long data) | |
1da177e4 | 408 | { |
1da177e4 LT |
409 | ptrace_area parea; |
410 | int copied, ret; | |
411 | ||
412 | switch (request) { | |
1da177e4 LT |
413 | case PTRACE_PEEKUSR: |
414 | /* read the word at location addr in the USER area. */ | |
415 | return peek_user(child, addr, data); | |
416 | ||
1da177e4 LT |
417 | case PTRACE_POKEUSR: |
418 | /* write the word at location addr in the USER area */ | |
419 | return poke_user(child, addr, data); | |
420 | ||
421 | case PTRACE_PEEKUSR_AREA: | |
422 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 423 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
424 | sizeof(parea))) |
425 | return -EFAULT; | |
426 | addr = parea.kernel_addr; | |
427 | data = parea.process_addr; | |
428 | copied = 0; | |
429 | while (copied < parea.len) { | |
430 | if (request == PTRACE_PEEKUSR_AREA) | |
431 | ret = peek_user(child, addr, data); | |
432 | else { | |
2b67fc46 HC |
433 | addr_t utmp; |
434 | if (get_user(utmp, | |
435 | (addr_t __force __user *) data)) | |
1da177e4 | 436 | return -EFAULT; |
2b67fc46 | 437 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
438 | } |
439 | if (ret) | |
440 | return ret; | |
441 | addr += sizeof(unsigned long); | |
442 | data += sizeof(unsigned long); | |
443 | copied += sizeof(unsigned long); | |
444 | } | |
445 | return 0; | |
86f2552b MS |
446 | case PTRACE_GET_LAST_BREAK: |
447 | put_user(task_thread_info(child)->last_break, | |
448 | (unsigned long __user *) data); | |
449 | return 0; | |
d35339a4 MS |
450 | case PTRACE_ENABLE_TE: |
451 | if (!MACHINE_HAS_TE) | |
452 | return -EIO; | |
453 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
454 | return 0; | |
455 | case PTRACE_DISABLE_TE: | |
456 | if (!MACHINE_HAS_TE) | |
457 | return -EIO; | |
458 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
64597f9d MM |
459 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; |
460 | return 0; | |
461 | case PTRACE_TE_ABORT_RAND: | |
462 | if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) | |
463 | return -EIO; | |
464 | switch (data) { | |
465 | case 0UL: | |
466 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; | |
467 | break; | |
468 | case 1UL: | |
469 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
470 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; | |
471 | break; | |
472 | case 2UL: | |
473 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
474 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; | |
475 | break; | |
476 | default: | |
477 | return -EINVAL; | |
478 | } | |
d35339a4 | 479 | return 0; |
07805ac8 CB |
480 | default: |
481 | /* Removing high order bit from addr (only for 31 bit). */ | |
482 | addr &= PSW_ADDR_INSN; | |
483 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 484 | } |
1da177e4 LT |
485 | } |
486 | ||
347a8dc3 | 487 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
488 | /* |
489 | * Now the fun part starts... a 31 bit program running in the | |
490 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
491 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
492 | * to handle, the difference to the 64 bit versions of the requests | |
493 | * is that the access is done in multiples of 4 byte instead of | |
494 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
495 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
496 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
497 | * is a 31 bit program too, the content of struct user can be | |
498 | * emulated. A 31 bit program peeking into the struct user of | |
499 | * a 64 bit program is a no-no. | |
500 | */ | |
501 | ||
5e9a2692 MS |
502 | /* |
503 | * Same as peek_user_per but for a 31 bit program. | |
504 | */ | |
505 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
506 | addr_t addr) | |
507 | { | |
508 | struct compat_per_struct_kernel *dummy32 = NULL; | |
509 | ||
510 | if (addr == (addr_t) &dummy32->cr9) | |
511 | /* Control bits of the active per set. */ | |
512 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
513 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
514 | else if (addr == (addr_t) &dummy32->cr10) | |
515 | /* Start address of the active per set. */ | |
516 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
517 | 0 : child->thread.per_user.start; | |
518 | else if (addr == (addr_t) &dummy32->cr11) | |
519 | /* End address of the active per set. */ | |
520 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
521 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
522 | else if (addr == (addr_t) &dummy32->bits) | |
523 | /* Single-step bit. */ | |
524 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
525 | 0x80000000 : 0; | |
526 | else if (addr == (addr_t) &dummy32->starting_addr) | |
527 | /* Start address of the user specified per set. */ | |
528 | return (__u32) child->thread.per_user.start; | |
529 | else if (addr == (addr_t) &dummy32->ending_addr) | |
530 | /* End address of the user specified per set. */ | |
531 | return (__u32) child->thread.per_user.end; | |
532 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
533 | /* PER code, ATMID and AI of the last PER trap */ | |
534 | return (__u32) child->thread.per_event.cause << 16; | |
535 | else if (addr == (addr_t) &dummy32->address) | |
536 | /* Address of the last PER trap */ | |
537 | return (__u32) child->thread.per_event.address; | |
538 | else if (addr == (addr_t) &dummy32->access_id) | |
539 | /* Access id of the last PER trap */ | |
540 | return (__u32) child->thread.per_event.paid << 24; | |
541 | return 0; | |
542 | } | |
543 | ||
1da177e4 LT |
544 | /* |
545 | * Same as peek_user but for a 31 bit program. | |
546 | */ | |
63506c41 | 547 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 548 | { |
5e9a2692 | 549 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
550 | addr_t offset; |
551 | __u32 tmp; | |
552 | ||
1da177e4 | 553 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 554 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
555 | /* |
556 | * psw and gprs are stored on the stack | |
557 | */ | |
558 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
559 | /* Fake a 31 bit psw mask. */ | |
b50511e4 | 560 | tmp = (__u32)(regs->psw.mask >> 32); |
5ebf250d | 561 | tmp &= PSW32_MASK_USER | PSW32_MASK_RI; |
f26946d7 | 562 | tmp |= PSW32_USER_BITS; |
1da177e4 LT |
563 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
564 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
565 | tmp = (__u32) regs->psw.addr | |
566 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
567 | } else { |
568 | /* gpr 0-15 */ | |
b50511e4 | 569 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
570 | } |
571 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
572 | /* | |
573 | * access registers are stored in the thread structure | |
574 | */ | |
575 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
576 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
577 | ||
578 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
579 | /* | |
580 | * orig_gpr2 is stored on the kernel stack | |
581 | */ | |
c7584fb6 | 582 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 583 | |
3d6e48f4 JW |
584 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
585 | /* | |
586 | * prevent reads of padding hole between | |
587 | * orig_gpr2 and fp_regs on s390. | |
588 | */ | |
589 | tmp = 0; | |
590 | ||
1da177e4 LT |
591 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
592 | /* | |
593 | * floating point regs. are stored in the thread structure | |
594 | */ | |
595 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
596 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
597 | ||
598 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
599 | /* | |
5e9a2692 | 600 | * Handle access to the per_info structure. |
1da177e4 | 601 | */ |
5e9a2692 MS |
602 | addr -= (addr_t) &dummy32->regs.per_info; |
603 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
604 | |
605 | } else | |
606 | tmp = 0; | |
607 | ||
63506c41 MS |
608 | return tmp; |
609 | } | |
610 | ||
611 | static int peek_user_compat(struct task_struct *child, | |
612 | addr_t addr, addr_t data) | |
613 | { | |
614 | __u32 tmp; | |
615 | ||
7757591a | 616 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
617 | return -EIO; |
618 | ||
619 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
620 | return put_user(tmp, (__u32 __user *) data); |
621 | } | |
622 | ||
5e9a2692 MS |
623 | /* |
624 | * Same as poke_user_per but for a 31 bit program. | |
625 | */ | |
626 | static inline void __poke_user_per_compat(struct task_struct *child, | |
627 | addr_t addr, __u32 data) | |
628 | { | |
629 | struct compat_per_struct_kernel *dummy32 = NULL; | |
630 | ||
631 | if (addr == (addr_t) &dummy32->cr9) | |
632 | /* PER event mask of the user specified per set. */ | |
633 | child->thread.per_user.control = | |
634 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
635 | else if (addr == (addr_t) &dummy32->starting_addr) | |
636 | /* Starting address of the user specified per set. */ | |
637 | child->thread.per_user.start = data; | |
638 | else if (addr == (addr_t) &dummy32->ending_addr) | |
639 | /* Ending address of the user specified per set. */ | |
640 | child->thread.per_user.end = data; | |
641 | } | |
642 | ||
1da177e4 LT |
643 | /* |
644 | * Same as poke_user but for a 31 bit program. | |
645 | */ | |
63506c41 MS |
646 | static int __poke_user_compat(struct task_struct *child, |
647 | addr_t addr, addr_t data) | |
1da177e4 | 648 | { |
5e9a2692 | 649 | struct compat_user *dummy32 = NULL; |
63506c41 | 650 | __u32 tmp = (__u32) data; |
1da177e4 | 651 | addr_t offset; |
1da177e4 LT |
652 | |
653 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 654 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
655 | /* |
656 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
657 | */ | |
658 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
5ebf250d HC |
659 | __u32 mask = PSW32_MASK_USER; |
660 | ||
661 | mask |= is_ri_task(child) ? PSW32_MASK_RI : 0; | |
1da177e4 | 662 | /* Build a 64 bit psw mask from 31 bit mask. */ |
f26946d7 | 663 | if ((tmp & ~mask) != PSW32_USER_BITS) |
1da177e4 LT |
664 | /* Invalid psw mask. */ |
665 | return -EINVAL; | |
b50511e4 | 666 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 667 | (regs->psw.mask & PSW_MASK_BA) | |
5ebf250d | 668 | (__u64)(tmp & mask) << 32; |
1da177e4 LT |
669 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
670 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 671 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
672 | /* Transfer 31 bit amode bit to psw mask. */ |
673 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
674 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
675 | } else { |
676 | /* gpr 0-15 */ | |
b50511e4 | 677 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
678 | } |
679 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
680 | /* | |
681 | * access registers are stored in the thread structure | |
682 | */ | |
683 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
684 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
685 | ||
686 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
687 | /* | |
688 | * orig_gpr2 is stored on the kernel stack | |
689 | */ | |
c7584fb6 | 690 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 691 | |
3d6e48f4 JW |
692 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
693 | /* | |
694 | * prevent writess of padding hole between | |
695 | * orig_gpr2 and fp_regs on s390. | |
696 | */ | |
697 | return 0; | |
698 | ||
1da177e4 LT |
699 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
700 | /* | |
701 | * floating point regs. are stored in the thread structure | |
702 | */ | |
703 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
4725c860 | 704 | test_fp_ctl(tmp)) |
1da177e4 LT |
705 | return -EINVAL; |
706 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
707 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
708 | ||
709 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
710 | /* | |
5e9a2692 | 711 | * Handle access to the per_info structure. |
1da177e4 | 712 | */ |
5e9a2692 MS |
713 | addr -= (addr_t) &dummy32->regs.per_info; |
714 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
715 | } |
716 | ||
1da177e4 LT |
717 | return 0; |
718 | } | |
719 | ||
63506c41 MS |
720 | static int poke_user_compat(struct task_struct *child, |
721 | addr_t addr, addr_t data) | |
722 | { | |
5e9a2692 MS |
723 | if (!is_compat_task() || (addr & 3) || |
724 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
725 | return -EIO; |
726 | ||
727 | return __poke_user_compat(child, addr, data); | |
728 | } | |
729 | ||
b499d76b RM |
730 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
731 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 732 | { |
b499d76b RM |
733 | unsigned long addr = caddr; |
734 | unsigned long data = cdata; | |
5e9a2692 | 735 | compat_ptrace_area parea; |
1da177e4 LT |
736 | int copied, ret; |
737 | ||
738 | switch (request) { | |
1da177e4 LT |
739 | case PTRACE_PEEKUSR: |
740 | /* read the word at location addr in the USER area. */ | |
63506c41 | 741 | return peek_user_compat(child, addr, data); |
1da177e4 | 742 | |
1da177e4 LT |
743 | case PTRACE_POKEUSR: |
744 | /* write the word at location addr in the USER area */ | |
63506c41 | 745 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
746 | |
747 | case PTRACE_PEEKUSR_AREA: | |
748 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 749 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
750 | sizeof(parea))) |
751 | return -EFAULT; | |
752 | addr = parea.kernel_addr; | |
753 | data = parea.process_addr; | |
754 | copied = 0; | |
755 | while (copied < parea.len) { | |
756 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 757 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 758 | else { |
2b67fc46 HC |
759 | __u32 utmp; |
760 | if (get_user(utmp, | |
761 | (__u32 __force __user *) data)) | |
1da177e4 | 762 | return -EFAULT; |
63506c41 | 763 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
764 | } |
765 | if (ret) | |
766 | return ret; | |
767 | addr += sizeof(unsigned int); | |
768 | data += sizeof(unsigned int); | |
769 | copied += sizeof(unsigned int); | |
770 | } | |
771 | return 0; | |
86f2552b MS |
772 | case PTRACE_GET_LAST_BREAK: |
773 | put_user(task_thread_info(child)->last_break, | |
774 | (unsigned int __user *) data); | |
775 | return 0; | |
1da177e4 | 776 | } |
b499d76b | 777 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
778 | } |
779 | #endif | |
780 | ||
753c4dd6 | 781 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 782 | { |
545c174d | 783 | long ret = 0; |
1da177e4 | 784 | |
bcf5cef7 | 785 | /* Do the secure computing check first. */ |
c63cb468 HC |
786 | if (secure_computing(regs->gprs[2])) { |
787 | /* seccomp failures shouldn't expose any additional code. */ | |
788 | ret = -1; | |
789 | goto out; | |
790 | } | |
bcf5cef7 | 791 | |
c5c3a6d8 | 792 | /* |
753c4dd6 MS |
793 | * The sysc_tracesys code in entry.S stored the system |
794 | * call number to gprs[2]. | |
c5c3a6d8 | 795 | */ |
753c4dd6 MS |
796 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
797 | (tracehook_report_syscall_entry(regs) || | |
798 | regs->gprs[2] >= NR_syscalls)) { | |
799 | /* | |
800 | * Tracing decided this syscall should not happen or the | |
801 | * debugger stored an invalid system call number. Skip | |
802 | * the system call and the system call restart handling. | |
803 | */ | |
b6ef5bb3 | 804 | clear_thread_flag(TIF_SYSCALL); |
753c4dd6 | 805 | ret = -1; |
1da177e4 | 806 | } |
753c4dd6 | 807 | |
66700001 | 808 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 809 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 810 | |
b05d8447 EP |
811 | audit_syscall_entry(is_compat_task() ? |
812 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, | |
813 | regs->gprs[2], regs->orig_gpr2, | |
814 | regs->gprs[3], regs->gprs[4], | |
815 | regs->gprs[5]); | |
c63cb468 | 816 | out: |
545c174d | 817 | return ret ?: regs->gprs[2]; |
753c4dd6 MS |
818 | } |
819 | ||
820 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
821 | { | |
d7e7528b | 822 | audit_syscall_exit(regs); |
753c4dd6 | 823 | |
66700001 | 824 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 825 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 826 | |
753c4dd6 MS |
827 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
828 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 829 | } |
63506c41 MS |
830 | |
831 | /* | |
832 | * user_regset definitions. | |
833 | */ | |
834 | ||
835 | static int s390_regs_get(struct task_struct *target, | |
836 | const struct user_regset *regset, | |
837 | unsigned int pos, unsigned int count, | |
838 | void *kbuf, void __user *ubuf) | |
839 | { | |
840 | if (target == current) | |
841 | save_access_regs(target->thread.acrs); | |
842 | ||
843 | if (kbuf) { | |
844 | unsigned long *k = kbuf; | |
845 | while (count > 0) { | |
846 | *k++ = __peek_user(target, pos); | |
847 | count -= sizeof(*k); | |
848 | pos += sizeof(*k); | |
849 | } | |
850 | } else { | |
851 | unsigned long __user *u = ubuf; | |
852 | while (count > 0) { | |
853 | if (__put_user(__peek_user(target, pos), u++)) | |
854 | return -EFAULT; | |
855 | count -= sizeof(*u); | |
856 | pos += sizeof(*u); | |
857 | } | |
858 | } | |
859 | return 0; | |
860 | } | |
861 | ||
862 | static int s390_regs_set(struct task_struct *target, | |
863 | const struct user_regset *regset, | |
864 | unsigned int pos, unsigned int count, | |
865 | const void *kbuf, const void __user *ubuf) | |
866 | { | |
867 | int rc = 0; | |
868 | ||
869 | if (target == current) | |
870 | save_access_regs(target->thread.acrs); | |
871 | ||
872 | if (kbuf) { | |
873 | const unsigned long *k = kbuf; | |
874 | while (count > 0 && !rc) { | |
875 | rc = __poke_user(target, pos, *k++); | |
876 | count -= sizeof(*k); | |
877 | pos += sizeof(*k); | |
878 | } | |
879 | } else { | |
880 | const unsigned long __user *u = ubuf; | |
881 | while (count > 0 && !rc) { | |
882 | unsigned long word; | |
883 | rc = __get_user(word, u++); | |
884 | if (rc) | |
885 | break; | |
886 | rc = __poke_user(target, pos, word); | |
887 | count -= sizeof(*u); | |
888 | pos += sizeof(*u); | |
889 | } | |
890 | } | |
891 | ||
892 | if (rc == 0 && target == current) | |
893 | restore_access_regs(target->thread.acrs); | |
894 | ||
895 | return rc; | |
896 | } | |
897 | ||
898 | static int s390_fpregs_get(struct task_struct *target, | |
899 | const struct user_regset *regset, unsigned int pos, | |
900 | unsigned int count, void *kbuf, void __user *ubuf) | |
901 | { | |
4725c860 MS |
902 | if (target == current) { |
903 | save_fp_ctl(&target->thread.fp_regs.fpc); | |
904 | save_fp_regs(target->thread.fp_regs.fprs); | |
905 | } | |
63506c41 MS |
906 | |
907 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
908 | &target->thread.fp_regs, 0, -1); | |
909 | } | |
910 | ||
911 | static int s390_fpregs_set(struct task_struct *target, | |
912 | const struct user_regset *regset, unsigned int pos, | |
913 | unsigned int count, const void *kbuf, | |
914 | const void __user *ubuf) | |
915 | { | |
916 | int rc = 0; | |
917 | ||
4725c860 MS |
918 | if (target == current) { |
919 | save_fp_ctl(&target->thread.fp_regs.fpc); | |
920 | save_fp_regs(target->thread.fp_regs.fprs); | |
921 | } | |
63506c41 MS |
922 | |
923 | /* If setting FPC, must validate it first. */ | |
924 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
4725c860 MS |
925 | u32 ufpc[2] = { target->thread.fp_regs.fpc, 0 }; |
926 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc, | |
63506c41 MS |
927 | 0, offsetof(s390_fp_regs, fprs)); |
928 | if (rc) | |
929 | return rc; | |
4725c860 | 930 | if (ufpc[1] != 0 || test_fp_ctl(ufpc[0])) |
63506c41 | 931 | return -EINVAL; |
4725c860 | 932 | target->thread.fp_regs.fpc = ufpc[0]; |
63506c41 MS |
933 | } |
934 | ||
935 | if (rc == 0 && count > 0) | |
936 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
937 | target->thread.fp_regs.fprs, | |
938 | offsetof(s390_fp_regs, fprs), -1); | |
939 | ||
4725c860 MS |
940 | if (rc == 0 && target == current) { |
941 | restore_fp_ctl(&target->thread.fp_regs.fpc); | |
942 | restore_fp_regs(target->thread.fp_regs.fprs); | |
943 | } | |
63506c41 MS |
944 | |
945 | return rc; | |
946 | } | |
947 | ||
86f2552b MS |
948 | #ifdef CONFIG_64BIT |
949 | ||
950 | static int s390_last_break_get(struct task_struct *target, | |
951 | const struct user_regset *regset, | |
952 | unsigned int pos, unsigned int count, | |
953 | void *kbuf, void __user *ubuf) | |
954 | { | |
955 | if (count > 0) { | |
956 | if (kbuf) { | |
957 | unsigned long *k = kbuf; | |
958 | *k = task_thread_info(target)->last_break; | |
959 | } else { | |
960 | unsigned long __user *u = ubuf; | |
961 | if (__put_user(task_thread_info(target)->last_break, u)) | |
962 | return -EFAULT; | |
963 | } | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | ||
b934069c MS |
968 | static int s390_last_break_set(struct task_struct *target, |
969 | const struct user_regset *regset, | |
970 | unsigned int pos, unsigned int count, | |
971 | const void *kbuf, const void __user *ubuf) | |
972 | { | |
973 | return 0; | |
974 | } | |
975 | ||
d35339a4 MS |
976 | static int s390_tdb_get(struct task_struct *target, |
977 | const struct user_regset *regset, | |
978 | unsigned int pos, unsigned int count, | |
979 | void *kbuf, void __user *ubuf) | |
980 | { | |
981 | struct pt_regs *regs = task_pt_regs(target); | |
982 | unsigned char *data; | |
983 | ||
984 | if (!(regs->int_code & 0x200)) | |
985 | return -ENODATA; | |
986 | data = target->thread.trap_tdb; | |
987 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
988 | } | |
989 | ||
990 | static int s390_tdb_set(struct task_struct *target, | |
991 | const struct user_regset *regset, | |
992 | unsigned int pos, unsigned int count, | |
993 | const void *kbuf, const void __user *ubuf) | |
994 | { | |
995 | return 0; | |
996 | } | |
997 | ||
86f2552b MS |
998 | #endif |
999 | ||
20b40a79 MS |
1000 | static int s390_system_call_get(struct task_struct *target, |
1001 | const struct user_regset *regset, | |
1002 | unsigned int pos, unsigned int count, | |
1003 | void *kbuf, void __user *ubuf) | |
1004 | { | |
1005 | unsigned int *data = &task_thread_info(target)->system_call; | |
1006 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
1007 | data, 0, sizeof(unsigned int)); | |
1008 | } | |
1009 | ||
1010 | static int s390_system_call_set(struct task_struct *target, | |
1011 | const struct user_regset *regset, | |
1012 | unsigned int pos, unsigned int count, | |
1013 | const void *kbuf, const void __user *ubuf) | |
1014 | { | |
1015 | unsigned int *data = &task_thread_info(target)->system_call; | |
1016 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
1017 | data, 0, sizeof(unsigned int)); | |
1018 | } | |
1019 | ||
63506c41 MS |
1020 | static const struct user_regset s390_regsets[] = { |
1021 | [REGSET_GENERAL] = { | |
1022 | .core_note_type = NT_PRSTATUS, | |
1023 | .n = sizeof(s390_regs) / sizeof(long), | |
1024 | .size = sizeof(long), | |
1025 | .align = sizeof(long), | |
1026 | .get = s390_regs_get, | |
1027 | .set = s390_regs_set, | |
1028 | }, | |
1029 | [REGSET_FP] = { | |
1030 | .core_note_type = NT_PRFPREG, | |
1031 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
1032 | .size = sizeof(long), | |
1033 | .align = sizeof(long), | |
1034 | .get = s390_fpregs_get, | |
1035 | .set = s390_fpregs_set, | |
1036 | }, | |
86f2552b MS |
1037 | #ifdef CONFIG_64BIT |
1038 | [REGSET_LAST_BREAK] = { | |
1039 | .core_note_type = NT_S390_LAST_BREAK, | |
1040 | .n = 1, | |
1041 | .size = sizeof(long), | |
1042 | .align = sizeof(long), | |
1043 | .get = s390_last_break_get, | |
b934069c | 1044 | .set = s390_last_break_set, |
86f2552b | 1045 | }, |
d35339a4 MS |
1046 | [REGSET_TDB] = { |
1047 | .core_note_type = NT_S390_TDB, | |
1048 | .n = 1, | |
1049 | .size = 256, | |
1050 | .align = 1, | |
1051 | .get = s390_tdb_get, | |
1052 | .set = s390_tdb_set, | |
1053 | }, | |
86f2552b | 1054 | #endif |
20b40a79 MS |
1055 | [REGSET_SYSTEM_CALL] = { |
1056 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1057 | .n = 1, | |
1058 | .size = sizeof(unsigned int), | |
1059 | .align = sizeof(unsigned int), | |
1060 | .get = s390_system_call_get, | |
1061 | .set = s390_system_call_set, | |
1062 | }, | |
63506c41 MS |
1063 | }; |
1064 | ||
1065 | static const struct user_regset_view user_s390_view = { | |
1066 | .name = UTS_MACHINE, | |
1067 | .e_machine = EM_S390, | |
1068 | .regsets = s390_regsets, | |
1069 | .n = ARRAY_SIZE(s390_regsets) | |
1070 | }; | |
1071 | ||
1072 | #ifdef CONFIG_COMPAT | |
1073 | static int s390_compat_regs_get(struct task_struct *target, | |
1074 | const struct user_regset *regset, | |
1075 | unsigned int pos, unsigned int count, | |
1076 | void *kbuf, void __user *ubuf) | |
1077 | { | |
1078 | if (target == current) | |
1079 | save_access_regs(target->thread.acrs); | |
1080 | ||
1081 | if (kbuf) { | |
1082 | compat_ulong_t *k = kbuf; | |
1083 | while (count > 0) { | |
1084 | *k++ = __peek_user_compat(target, pos); | |
1085 | count -= sizeof(*k); | |
1086 | pos += sizeof(*k); | |
1087 | } | |
1088 | } else { | |
1089 | compat_ulong_t __user *u = ubuf; | |
1090 | while (count > 0) { | |
1091 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1092 | return -EFAULT; | |
1093 | count -= sizeof(*u); | |
1094 | pos += sizeof(*u); | |
1095 | } | |
1096 | } | |
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | static int s390_compat_regs_set(struct task_struct *target, | |
1101 | const struct user_regset *regset, | |
1102 | unsigned int pos, unsigned int count, | |
1103 | const void *kbuf, const void __user *ubuf) | |
1104 | { | |
1105 | int rc = 0; | |
1106 | ||
1107 | if (target == current) | |
1108 | save_access_regs(target->thread.acrs); | |
1109 | ||
1110 | if (kbuf) { | |
1111 | const compat_ulong_t *k = kbuf; | |
1112 | while (count > 0 && !rc) { | |
1113 | rc = __poke_user_compat(target, pos, *k++); | |
1114 | count -= sizeof(*k); | |
1115 | pos += sizeof(*k); | |
1116 | } | |
1117 | } else { | |
1118 | const compat_ulong_t __user *u = ubuf; | |
1119 | while (count > 0 && !rc) { | |
1120 | compat_ulong_t word; | |
1121 | rc = __get_user(word, u++); | |
1122 | if (rc) | |
1123 | break; | |
1124 | rc = __poke_user_compat(target, pos, word); | |
1125 | count -= sizeof(*u); | |
1126 | pos += sizeof(*u); | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | if (rc == 0 && target == current) | |
1131 | restore_access_regs(target->thread.acrs); | |
1132 | ||
1133 | return rc; | |
1134 | } | |
1135 | ||
ea2a4d3a HC |
1136 | static int s390_compat_regs_high_get(struct task_struct *target, |
1137 | const struct user_regset *regset, | |
1138 | unsigned int pos, unsigned int count, | |
1139 | void *kbuf, void __user *ubuf) | |
1140 | { | |
1141 | compat_ulong_t *gprs_high; | |
1142 | ||
1143 | gprs_high = (compat_ulong_t *) | |
1144 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1145 | if (kbuf) { | |
1146 | compat_ulong_t *k = kbuf; | |
1147 | while (count > 0) { | |
1148 | *k++ = *gprs_high; | |
1149 | gprs_high += 2; | |
1150 | count -= sizeof(*k); | |
1151 | } | |
1152 | } else { | |
1153 | compat_ulong_t __user *u = ubuf; | |
1154 | while (count > 0) { | |
1155 | if (__put_user(*gprs_high, u++)) | |
1156 | return -EFAULT; | |
1157 | gprs_high += 2; | |
1158 | count -= sizeof(*u); | |
1159 | } | |
1160 | } | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1165 | const struct user_regset *regset, | |
1166 | unsigned int pos, unsigned int count, | |
1167 | const void *kbuf, const void __user *ubuf) | |
1168 | { | |
1169 | compat_ulong_t *gprs_high; | |
1170 | int rc = 0; | |
1171 | ||
1172 | gprs_high = (compat_ulong_t *) | |
1173 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1174 | if (kbuf) { | |
1175 | const compat_ulong_t *k = kbuf; | |
1176 | while (count > 0) { | |
1177 | *gprs_high = *k++; | |
1178 | *gprs_high += 2; | |
1179 | count -= sizeof(*k); | |
1180 | } | |
1181 | } else { | |
1182 | const compat_ulong_t __user *u = ubuf; | |
1183 | while (count > 0 && !rc) { | |
1184 | unsigned long word; | |
1185 | rc = __get_user(word, u++); | |
1186 | if (rc) | |
1187 | break; | |
1188 | *gprs_high = word; | |
1189 | *gprs_high += 2; | |
1190 | count -= sizeof(*u); | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | return rc; | |
1195 | } | |
1196 | ||
86f2552b MS |
1197 | static int s390_compat_last_break_get(struct task_struct *target, |
1198 | const struct user_regset *regset, | |
1199 | unsigned int pos, unsigned int count, | |
1200 | void *kbuf, void __user *ubuf) | |
1201 | { | |
1202 | compat_ulong_t last_break; | |
1203 | ||
1204 | if (count > 0) { | |
1205 | last_break = task_thread_info(target)->last_break; | |
1206 | if (kbuf) { | |
1207 | unsigned long *k = kbuf; | |
1208 | *k = last_break; | |
1209 | } else { | |
1210 | unsigned long __user *u = ubuf; | |
1211 | if (__put_user(last_break, u)) | |
1212 | return -EFAULT; | |
1213 | } | |
1214 | } | |
1215 | return 0; | |
1216 | } | |
1217 | ||
b934069c MS |
1218 | static int s390_compat_last_break_set(struct task_struct *target, |
1219 | const struct user_regset *regset, | |
1220 | unsigned int pos, unsigned int count, | |
1221 | const void *kbuf, const void __user *ubuf) | |
1222 | { | |
1223 | return 0; | |
1224 | } | |
1225 | ||
63506c41 MS |
1226 | static const struct user_regset s390_compat_regsets[] = { |
1227 | [REGSET_GENERAL] = { | |
1228 | .core_note_type = NT_PRSTATUS, | |
1229 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1230 | .size = sizeof(compat_long_t), | |
1231 | .align = sizeof(compat_long_t), | |
1232 | .get = s390_compat_regs_get, | |
1233 | .set = s390_compat_regs_set, | |
1234 | }, | |
1235 | [REGSET_FP] = { | |
1236 | .core_note_type = NT_PRFPREG, | |
1237 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1238 | .size = sizeof(compat_long_t), | |
1239 | .align = sizeof(compat_long_t), | |
1240 | .get = s390_fpregs_get, | |
1241 | .set = s390_fpregs_set, | |
1242 | }, | |
86f2552b MS |
1243 | [REGSET_LAST_BREAK] = { |
1244 | .core_note_type = NT_S390_LAST_BREAK, | |
1245 | .n = 1, | |
1246 | .size = sizeof(long), | |
1247 | .align = sizeof(long), | |
1248 | .get = s390_compat_last_break_get, | |
b934069c | 1249 | .set = s390_compat_last_break_set, |
86f2552b | 1250 | }, |
d35339a4 MS |
1251 | [REGSET_TDB] = { |
1252 | .core_note_type = NT_S390_TDB, | |
1253 | .n = 1, | |
1254 | .size = 256, | |
1255 | .align = 1, | |
1256 | .get = s390_tdb_get, | |
1257 | .set = s390_tdb_set, | |
1258 | }, | |
20b40a79 MS |
1259 | [REGSET_SYSTEM_CALL] = { |
1260 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1261 | .n = 1, | |
1262 | .size = sizeof(compat_uint_t), | |
1263 | .align = sizeof(compat_uint_t), | |
1264 | .get = s390_system_call_get, | |
1265 | .set = s390_system_call_set, | |
1266 | }, | |
ea2a4d3a | 1267 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 1268 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1269 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1270 | .size = sizeof(compat_long_t), | |
1271 | .align = sizeof(compat_long_t), | |
1272 | .get = s390_compat_regs_high_get, | |
1273 | .set = s390_compat_regs_high_set, | |
1274 | }, | |
63506c41 MS |
1275 | }; |
1276 | ||
1277 | static const struct user_regset_view user_s390_compat_view = { | |
1278 | .name = "s390", | |
1279 | .e_machine = EM_S390, | |
1280 | .regsets = s390_compat_regsets, | |
1281 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1282 | }; | |
1283 | #endif | |
1284 | ||
1285 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1286 | { | |
1287 | #ifdef CONFIG_COMPAT | |
1288 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1289 | return &user_s390_compat_view; | |
1290 | #endif | |
1291 | return &user_s390_view; | |
1292 | } | |
952974ac HC |
1293 | |
1294 | static const char *gpr_names[NUM_GPRS] = { | |
1295 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1296 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1297 | }; | |
1298 | ||
1299 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1300 | { | |
1301 | if (offset >= NUM_GPRS) | |
1302 | return 0; | |
1303 | return regs->gprs[offset]; | |
1304 | } | |
1305 | ||
1306 | int regs_query_register_offset(const char *name) | |
1307 | { | |
1308 | unsigned long offset; | |
1309 | ||
1310 | if (!name || *name != 'r') | |
1311 | return -EINVAL; | |
958d9072 | 1312 | if (kstrtoul(name + 1, 10, &offset)) |
952974ac HC |
1313 | return -EINVAL; |
1314 | if (offset >= NUM_GPRS) | |
1315 | return -EINVAL; | |
1316 | return offset; | |
1317 | } | |
1318 | ||
1319 | const char *regs_query_register_name(unsigned int offset) | |
1320 | { | |
1321 | if (offset >= NUM_GPRS) | |
1322 | return NULL; | |
1323 | return gpr_names[offset]; | |
1324 | } | |
1325 | ||
1326 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1327 | { | |
1328 | unsigned long ksp = kernel_stack_pointer(regs); | |
1329 | ||
1330 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1331 | } | |
1332 | ||
1333 | /** | |
1334 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1335 | * @regs:pt_regs which contains kernel stack pointer. | |
1336 | * @n:stack entry number. | |
1337 | * | |
1338 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1339 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1340 | * this returns 0. | |
1341 | */ | |
1342 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1343 | { | |
1344 | unsigned long addr; | |
1345 | ||
1346 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1347 | if (!regs_within_kernel_stack(regs, addr)) | |
1348 | return 0; | |
1349 | return *(unsigned long *)addr; | |
1350 | } |