]>
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 | ||
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 MS |
109 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
110 | if (task == current) | |
64597f9d | 111 | update_cr_regs(task); |
1da177e4 LT |
112 | } |
113 | ||
0ac30be4 | 114 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 115 | { |
5e9a2692 MS |
116 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
117 | if (task == current) | |
64597f9d | 118 | update_cr_regs(task); |
1da177e4 LT |
119 | } |
120 | ||
121 | /* | |
122 | * Called by kernel/ptrace.c when detaching.. | |
123 | * | |
5e9a2692 | 124 | * Clear all debugging related fields. |
1da177e4 | 125 | */ |
5e9a2692 | 126 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 127 | { |
5e9a2692 MS |
128 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
129 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
130 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
131 | clear_tsk_thread_flag(task, TIF_PER_TRAP); | |
d35339a4 | 132 | task->thread.per_flags = 0; |
1da177e4 LT |
133 | } |
134 | ||
347a8dc3 | 135 | #ifndef CONFIG_64BIT |
1da177e4 LT |
136 | # define __ADDR_MASK 3 |
137 | #else | |
138 | # define __ADDR_MASK 7 | |
139 | #endif | |
140 | ||
5e9a2692 MS |
141 | static inline unsigned long __peek_user_per(struct task_struct *child, |
142 | addr_t addr) | |
143 | { | |
144 | struct per_struct_kernel *dummy = NULL; | |
145 | ||
146 | if (addr == (addr_t) &dummy->cr9) | |
147 | /* Control bits of the active per set. */ | |
148 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
149 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
150 | else if (addr == (addr_t) &dummy->cr10) | |
151 | /* Start address of the active per set. */ | |
152 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
153 | 0 : child->thread.per_user.start; | |
154 | else if (addr == (addr_t) &dummy->cr11) | |
155 | /* End address of the active per set. */ | |
156 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
157 | PSW_ADDR_INSN : child->thread.per_user.end; | |
158 | else if (addr == (addr_t) &dummy->bits) | |
159 | /* Single-step bit. */ | |
160 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
161 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
162 | else if (addr == (addr_t) &dummy->starting_addr) | |
163 | /* Start address of the user specified per set. */ | |
164 | return child->thread.per_user.start; | |
165 | else if (addr == (addr_t) &dummy->ending_addr) | |
166 | /* End address of the user specified per set. */ | |
167 | return child->thread.per_user.end; | |
168 | else if (addr == (addr_t) &dummy->perc_atmid) | |
169 | /* PER code, ATMID and AI of the last PER trap */ | |
170 | return (unsigned long) | |
171 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
172 | else if (addr == (addr_t) &dummy->address) | |
173 | /* Address of the last PER trap */ | |
174 | return child->thread.per_event.address; | |
175 | else if (addr == (addr_t) &dummy->access_id) | |
176 | /* Access id of the last PER trap */ | |
177 | return (unsigned long) | |
178 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
179 | return 0; | |
180 | } | |
181 | ||
1da177e4 LT |
182 | /* |
183 | * Read the word at offset addr from the user area of a process. The | |
184 | * trouble here is that the information is littered over different | |
185 | * locations. The process registers are found on the kernel stack, | |
186 | * the floating point stuff and the trace settings are stored in | |
187 | * the task structure. In addition the different structures in | |
188 | * struct user contain pad bytes that should be read as zeroes. | |
189 | * Lovely... | |
190 | */ | |
63506c41 | 191 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
192 | { |
193 | struct user *dummy = NULL; | |
63506c41 | 194 | addr_t offset, tmp; |
1da177e4 LT |
195 | |
196 | if (addr < (addr_t) &dummy->regs.acrs) { | |
197 | /* | |
198 | * psw and gprs are stored on the stack | |
199 | */ | |
c7584fb6 | 200 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 | 201 | if (addr == (addr_t) &dummy->regs.psw.mask) |
b50511e4 | 202 | /* Return a clean psw mask. */ |
e258d719 | 203 | tmp = PSW_USER_BITS | (tmp & PSW_MASK_USER); |
1da177e4 LT |
204 | |
205 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
206 | /* | |
207 | * access registers are stored in the thread structure | |
208 | */ | |
209 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 210 | #ifdef CONFIG_64BIT |
778959db MS |
211 | /* |
212 | * Very special case: old & broken 64 bit gdb reading | |
213 | * from acrs[15]. Result is a 64 bit value. Read the | |
214 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
215 | */ | |
216 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
217 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
218 | else | |
219 | #endif | |
1da177e4 LT |
220 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
221 | ||
222 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
223 | /* | |
224 | * orig_gpr2 is stored on the kernel stack | |
225 | */ | |
c7584fb6 | 226 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 227 | |
3d6e48f4 JW |
228 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
229 | /* | |
230 | * prevent reads of padding hole between | |
231 | * orig_gpr2 and fp_regs on s390. | |
232 | */ | |
233 | tmp = 0; | |
234 | ||
1da177e4 LT |
235 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
236 | /* | |
237 | * floating point regs. are stored in the thread structure | |
238 | */ | |
239 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
240 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
241 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
242 | tmp &= (unsigned long) FPC_VALID_MASK | |
243 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
244 | |
245 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
246 | /* | |
5e9a2692 | 247 | * Handle access to the per_info structure. |
1da177e4 | 248 | */ |
5e9a2692 MS |
249 | addr -= (addr_t) &dummy->regs.per_info; |
250 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
251 | |
252 | } else | |
253 | tmp = 0; | |
254 | ||
63506c41 | 255 | return tmp; |
1da177e4 LT |
256 | } |
257 | ||
1da177e4 | 258 | static int |
63506c41 | 259 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 260 | { |
63506c41 | 261 | addr_t tmp, mask; |
1da177e4 LT |
262 | |
263 | /* | |
264 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 265 | * an alignment of 4. Programmers from hell... |
1da177e4 | 266 | */ |
778959db | 267 | mask = __ADDR_MASK; |
347a8dc3 | 268 | #ifdef CONFIG_64BIT |
547e3cec MS |
269 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
270 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
271 | mask = 3; |
272 | #endif | |
273 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
274 | return -EIO; |
275 | ||
63506c41 MS |
276 | tmp = __peek_user(child, addr); |
277 | return put_user(tmp, (addr_t __user *) data); | |
278 | } | |
279 | ||
5e9a2692 MS |
280 | static inline void __poke_user_per(struct task_struct *child, |
281 | addr_t addr, addr_t data) | |
282 | { | |
283 | struct per_struct_kernel *dummy = NULL; | |
284 | ||
285 | /* | |
286 | * There are only three fields in the per_info struct that the | |
287 | * debugger user can write to. | |
288 | * 1) cr9: the debugger wants to set a new PER event mask | |
289 | * 2) starting_addr: the debugger wants to set a new starting | |
290 | * address to use with the PER event mask. | |
291 | * 3) ending_addr: the debugger wants to set a new ending | |
292 | * address to use with the PER event mask. | |
293 | * The user specified PER event mask and the start and end | |
294 | * addresses are used only if single stepping is not in effect. | |
295 | * Writes to any other field in per_info are ignored. | |
296 | */ | |
297 | if (addr == (addr_t) &dummy->cr9) | |
298 | /* PER event mask of the user specified per set. */ | |
299 | child->thread.per_user.control = | |
300 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
301 | else if (addr == (addr_t) &dummy->starting_addr) | |
302 | /* Starting address of the user specified per set. */ | |
303 | child->thread.per_user.start = data; | |
304 | else if (addr == (addr_t) &dummy->ending_addr) | |
305 | /* Ending address of the user specified per set. */ | |
306 | child->thread.per_user.end = data; | |
307 | } | |
308 | ||
63506c41 MS |
309 | /* |
310 | * Write a word to the user area of a process at location addr. This | |
311 | * operation does have an additional problem compared to peek_user. | |
312 | * Stores to the program status word and on the floating point | |
313 | * control register needs to get checked for validity. | |
314 | */ | |
315 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
316 | { | |
317 | struct user *dummy = NULL; | |
d4e81b35 | 318 | addr_t offset; |
63506c41 | 319 | |
1da177e4 LT |
320 | if (addr < (addr_t) &dummy->regs.acrs) { |
321 | /* | |
322 | * psw and gprs are stored on the stack | |
323 | */ | |
324 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
e258d719 | 325 | ((data & ~PSW_MASK_USER) != PSW_USER_BITS || |
d4e81b35 | 326 | ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)))) |
1da177e4 LT |
327 | /* Invalid psw mask. */ |
328 | return -EINVAL; | |
c7584fb6 | 329 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
330 | |
331 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
332 | /* | |
333 | * access registers are stored in the thread structure | |
334 | */ | |
335 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 336 | #ifdef CONFIG_64BIT |
778959db MS |
337 | /* |
338 | * Very special case: old & broken 64 bit gdb writing | |
339 | * to acrs[15] with a 64 bit value. Ignore the lower | |
340 | * half of the value and write the upper 32 bit to | |
341 | * acrs[15]. Sick... | |
342 | */ | |
343 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
344 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
345 | else | |
346 | #endif | |
1da177e4 LT |
347 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
348 | ||
349 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
350 | /* | |
351 | * orig_gpr2 is stored on the kernel stack | |
352 | */ | |
c7584fb6 | 353 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 354 | |
3d6e48f4 JW |
355 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
356 | /* | |
357 | * prevent writes of padding hole between | |
358 | * orig_gpr2 and fp_regs on s390. | |
359 | */ | |
360 | return 0; | |
361 | ||
1da177e4 LT |
362 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
363 | /* | |
364 | * floating point regs. are stored in the thread structure | |
365 | */ | |
366 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
367 | (data & ~((unsigned long) FPC_VALID_MASK |
368 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
369 | return -EINVAL; |
370 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
371 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
372 | ||
373 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
374 | /* | |
5e9a2692 | 375 | * Handle access to the per_info structure. |
1da177e4 | 376 | */ |
5e9a2692 MS |
377 | addr -= (addr_t) &dummy->regs.per_info; |
378 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
379 | |
380 | } | |
381 | ||
1da177e4 LT |
382 | return 0; |
383 | } | |
384 | ||
5e9a2692 | 385 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 386 | { |
63506c41 MS |
387 | addr_t mask; |
388 | ||
389 | /* | |
390 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
391 | * an alignment of 4. Programmers from hell indeed... | |
392 | */ | |
393 | mask = __ADDR_MASK; | |
394 | #ifdef CONFIG_64BIT | |
547e3cec MS |
395 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
396 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
397 | mask = 3; |
398 | #endif | |
399 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
400 | return -EIO; | |
401 | ||
402 | return __poke_user(child, addr, data); | |
403 | } | |
404 | ||
9b05a69e NK |
405 | long arch_ptrace(struct task_struct *child, long request, |
406 | unsigned long addr, unsigned long data) | |
1da177e4 | 407 | { |
1da177e4 LT |
408 | ptrace_area parea; |
409 | int copied, ret; | |
410 | ||
411 | switch (request) { | |
1da177e4 LT |
412 | case PTRACE_PEEKUSR: |
413 | /* read the word at location addr in the USER area. */ | |
414 | return peek_user(child, addr, data); | |
415 | ||
1da177e4 LT |
416 | case PTRACE_POKEUSR: |
417 | /* write the word at location addr in the USER area */ | |
418 | return poke_user(child, addr, data); | |
419 | ||
420 | case PTRACE_PEEKUSR_AREA: | |
421 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 422 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
423 | sizeof(parea))) |
424 | return -EFAULT; | |
425 | addr = parea.kernel_addr; | |
426 | data = parea.process_addr; | |
427 | copied = 0; | |
428 | while (copied < parea.len) { | |
429 | if (request == PTRACE_PEEKUSR_AREA) | |
430 | ret = peek_user(child, addr, data); | |
431 | else { | |
2b67fc46 HC |
432 | addr_t utmp; |
433 | if (get_user(utmp, | |
434 | (addr_t __force __user *) data)) | |
1da177e4 | 435 | return -EFAULT; |
2b67fc46 | 436 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
437 | } |
438 | if (ret) | |
439 | return ret; | |
440 | addr += sizeof(unsigned long); | |
441 | data += sizeof(unsigned long); | |
442 | copied += sizeof(unsigned long); | |
443 | } | |
444 | return 0; | |
86f2552b MS |
445 | case PTRACE_GET_LAST_BREAK: |
446 | put_user(task_thread_info(child)->last_break, | |
447 | (unsigned long __user *) data); | |
448 | return 0; | |
d35339a4 MS |
449 | case PTRACE_ENABLE_TE: |
450 | if (!MACHINE_HAS_TE) | |
451 | return -EIO; | |
452 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
453 | return 0; | |
454 | case PTRACE_DISABLE_TE: | |
455 | if (!MACHINE_HAS_TE) | |
456 | return -EIO; | |
457 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
64597f9d MM |
458 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; |
459 | return 0; | |
460 | case PTRACE_TE_ABORT_RAND: | |
461 | if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) | |
462 | return -EIO; | |
463 | switch (data) { | |
464 | case 0UL: | |
465 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; | |
466 | break; | |
467 | case 1UL: | |
468 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
469 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; | |
470 | break; | |
471 | case 2UL: | |
472 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
473 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; | |
474 | break; | |
475 | default: | |
476 | return -EINVAL; | |
477 | } | |
d35339a4 | 478 | return 0; |
07805ac8 CB |
479 | default: |
480 | /* Removing high order bit from addr (only for 31 bit). */ | |
481 | addr &= PSW_ADDR_INSN; | |
482 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 483 | } |
1da177e4 LT |
484 | } |
485 | ||
347a8dc3 | 486 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
487 | /* |
488 | * Now the fun part starts... a 31 bit program running in the | |
489 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
490 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
491 | * to handle, the difference to the 64 bit versions of the requests | |
492 | * is that the access is done in multiples of 4 byte instead of | |
493 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
494 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
495 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
496 | * is a 31 bit program too, the content of struct user can be | |
497 | * emulated. A 31 bit program peeking into the struct user of | |
498 | * a 64 bit program is a no-no. | |
499 | */ | |
500 | ||
5e9a2692 MS |
501 | /* |
502 | * Same as peek_user_per but for a 31 bit program. | |
503 | */ | |
504 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
505 | addr_t addr) | |
506 | { | |
507 | struct compat_per_struct_kernel *dummy32 = NULL; | |
508 | ||
509 | if (addr == (addr_t) &dummy32->cr9) | |
510 | /* Control bits of the active per set. */ | |
511 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
512 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
513 | else if (addr == (addr_t) &dummy32->cr10) | |
514 | /* Start address of the active per set. */ | |
515 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
516 | 0 : child->thread.per_user.start; | |
517 | else if (addr == (addr_t) &dummy32->cr11) | |
518 | /* End address of the active per set. */ | |
519 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
520 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
521 | else if (addr == (addr_t) &dummy32->bits) | |
522 | /* Single-step bit. */ | |
523 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
524 | 0x80000000 : 0; | |
525 | else if (addr == (addr_t) &dummy32->starting_addr) | |
526 | /* Start address of the user specified per set. */ | |
527 | return (__u32) child->thread.per_user.start; | |
528 | else if (addr == (addr_t) &dummy32->ending_addr) | |
529 | /* End address of the user specified per set. */ | |
530 | return (__u32) child->thread.per_user.end; | |
531 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
532 | /* PER code, ATMID and AI of the last PER trap */ | |
533 | return (__u32) child->thread.per_event.cause << 16; | |
534 | else if (addr == (addr_t) &dummy32->address) | |
535 | /* Address of the last PER trap */ | |
536 | return (__u32) child->thread.per_event.address; | |
537 | else if (addr == (addr_t) &dummy32->access_id) | |
538 | /* Access id of the last PER trap */ | |
539 | return (__u32) child->thread.per_event.paid << 24; | |
540 | return 0; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /* |
544 | * Same as peek_user but for a 31 bit program. | |
545 | */ | |
63506c41 | 546 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 547 | { |
5e9a2692 | 548 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
549 | addr_t offset; |
550 | __u32 tmp; | |
551 | ||
1da177e4 | 552 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 553 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
554 | /* |
555 | * psw and gprs are stored on the stack | |
556 | */ | |
557 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
558 | /* Fake a 31 bit psw mask. */ | |
b50511e4 MS |
559 | tmp = (__u32)(regs->psw.mask >> 32); |
560 | tmp = psw32_user_bits | (tmp & PSW32_MASK_USER); | |
1da177e4 LT |
561 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
562 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
563 | tmp = (__u32) regs->psw.addr | |
564 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
565 | } else { |
566 | /* gpr 0-15 */ | |
b50511e4 | 567 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
568 | } |
569 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
570 | /* | |
571 | * access registers are stored in the thread structure | |
572 | */ | |
573 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
574 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
575 | ||
576 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
577 | /* | |
578 | * orig_gpr2 is stored on the kernel stack | |
579 | */ | |
c7584fb6 | 580 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 581 | |
3d6e48f4 JW |
582 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
583 | /* | |
584 | * prevent reads of padding hole between | |
585 | * orig_gpr2 and fp_regs on s390. | |
586 | */ | |
587 | tmp = 0; | |
588 | ||
1da177e4 LT |
589 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
590 | /* | |
591 | * floating point regs. are stored in the thread structure | |
592 | */ | |
593 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
594 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
595 | ||
596 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
597 | /* | |
5e9a2692 | 598 | * Handle access to the per_info structure. |
1da177e4 | 599 | */ |
5e9a2692 MS |
600 | addr -= (addr_t) &dummy32->regs.per_info; |
601 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
602 | |
603 | } else | |
604 | tmp = 0; | |
605 | ||
63506c41 MS |
606 | return tmp; |
607 | } | |
608 | ||
609 | static int peek_user_compat(struct task_struct *child, | |
610 | addr_t addr, addr_t data) | |
611 | { | |
612 | __u32 tmp; | |
613 | ||
7757591a | 614 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
615 | return -EIO; |
616 | ||
617 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
618 | return put_user(tmp, (__u32 __user *) data); |
619 | } | |
620 | ||
5e9a2692 MS |
621 | /* |
622 | * Same as poke_user_per but for a 31 bit program. | |
623 | */ | |
624 | static inline void __poke_user_per_compat(struct task_struct *child, | |
625 | addr_t addr, __u32 data) | |
626 | { | |
627 | struct compat_per_struct_kernel *dummy32 = NULL; | |
628 | ||
629 | if (addr == (addr_t) &dummy32->cr9) | |
630 | /* PER event mask of the user specified per set. */ | |
631 | child->thread.per_user.control = | |
632 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
633 | else if (addr == (addr_t) &dummy32->starting_addr) | |
634 | /* Starting address of the user specified per set. */ | |
635 | child->thread.per_user.start = data; | |
636 | else if (addr == (addr_t) &dummy32->ending_addr) | |
637 | /* Ending address of the user specified per set. */ | |
638 | child->thread.per_user.end = data; | |
639 | } | |
640 | ||
1da177e4 LT |
641 | /* |
642 | * Same as poke_user but for a 31 bit program. | |
643 | */ | |
63506c41 MS |
644 | static int __poke_user_compat(struct task_struct *child, |
645 | addr_t addr, addr_t data) | |
1da177e4 | 646 | { |
5e9a2692 | 647 | struct compat_user *dummy32 = NULL; |
63506c41 | 648 | __u32 tmp = (__u32) data; |
1da177e4 | 649 | addr_t offset; |
1da177e4 LT |
650 | |
651 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 652 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
653 | /* |
654 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
655 | */ | |
656 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
657 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
b50511e4 | 658 | if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits) |
1da177e4 LT |
659 | /* Invalid psw mask. */ |
660 | return -EINVAL; | |
b50511e4 | 661 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 662 | (regs->psw.mask & PSW_MASK_BA) | |
b50511e4 | 663 | (__u64)(tmp & PSW32_MASK_USER) << 32; |
1da177e4 LT |
664 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
665 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 666 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
667 | /* Transfer 31 bit amode bit to psw mask. */ |
668 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
669 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
670 | } else { |
671 | /* gpr 0-15 */ | |
b50511e4 | 672 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
673 | } |
674 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
675 | /* | |
676 | * access registers are stored in the thread structure | |
677 | */ | |
678 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
679 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
680 | ||
681 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
682 | /* | |
683 | * orig_gpr2 is stored on the kernel stack | |
684 | */ | |
c7584fb6 | 685 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 686 | |
3d6e48f4 JW |
687 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
688 | /* | |
689 | * prevent writess of padding hole between | |
690 | * orig_gpr2 and fp_regs on s390. | |
691 | */ | |
692 | return 0; | |
693 | ||
1da177e4 LT |
694 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
695 | /* | |
696 | * floating point regs. are stored in the thread structure | |
697 | */ | |
698 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
699 | (tmp & ~FPC_VALID_MASK) != 0) | |
700 | /* Invalid floating point control. */ | |
701 | return -EINVAL; | |
702 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
703 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
704 | ||
705 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
706 | /* | |
5e9a2692 | 707 | * Handle access to the per_info structure. |
1da177e4 | 708 | */ |
5e9a2692 MS |
709 | addr -= (addr_t) &dummy32->regs.per_info; |
710 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
711 | } |
712 | ||
1da177e4 LT |
713 | return 0; |
714 | } | |
715 | ||
63506c41 MS |
716 | static int poke_user_compat(struct task_struct *child, |
717 | addr_t addr, addr_t data) | |
718 | { | |
5e9a2692 MS |
719 | if (!is_compat_task() || (addr & 3) || |
720 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
721 | return -EIO; |
722 | ||
723 | return __poke_user_compat(child, addr, data); | |
724 | } | |
725 | ||
b499d76b RM |
726 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
727 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 728 | { |
b499d76b RM |
729 | unsigned long addr = caddr; |
730 | unsigned long data = cdata; | |
5e9a2692 | 731 | compat_ptrace_area parea; |
1da177e4 LT |
732 | int copied, ret; |
733 | ||
734 | switch (request) { | |
1da177e4 LT |
735 | case PTRACE_PEEKUSR: |
736 | /* read the word at location addr in the USER area. */ | |
63506c41 | 737 | return peek_user_compat(child, addr, data); |
1da177e4 | 738 | |
1da177e4 LT |
739 | case PTRACE_POKEUSR: |
740 | /* write the word at location addr in the USER area */ | |
63506c41 | 741 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
742 | |
743 | case PTRACE_PEEKUSR_AREA: | |
744 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 745 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
746 | sizeof(parea))) |
747 | return -EFAULT; | |
748 | addr = parea.kernel_addr; | |
749 | data = parea.process_addr; | |
750 | copied = 0; | |
751 | while (copied < parea.len) { | |
752 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 753 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 754 | else { |
2b67fc46 HC |
755 | __u32 utmp; |
756 | if (get_user(utmp, | |
757 | (__u32 __force __user *) data)) | |
1da177e4 | 758 | return -EFAULT; |
63506c41 | 759 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
760 | } |
761 | if (ret) | |
762 | return ret; | |
763 | addr += sizeof(unsigned int); | |
764 | data += sizeof(unsigned int); | |
765 | copied += sizeof(unsigned int); | |
766 | } | |
767 | return 0; | |
86f2552b MS |
768 | case PTRACE_GET_LAST_BREAK: |
769 | put_user(task_thread_info(child)->last_break, | |
770 | (unsigned int __user *) data); | |
771 | return 0; | |
1da177e4 | 772 | } |
b499d76b | 773 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
774 | } |
775 | #endif | |
776 | ||
753c4dd6 | 777 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 778 | { |
545c174d | 779 | long ret = 0; |
1da177e4 | 780 | |
bcf5cef7 | 781 | /* Do the secure computing check first. */ |
c63cb468 HC |
782 | if (secure_computing(regs->gprs[2])) { |
783 | /* seccomp failures shouldn't expose any additional code. */ | |
784 | ret = -1; | |
785 | goto out; | |
786 | } | |
bcf5cef7 | 787 | |
c5c3a6d8 | 788 | /* |
753c4dd6 MS |
789 | * The sysc_tracesys code in entry.S stored the system |
790 | * call number to gprs[2]. | |
c5c3a6d8 | 791 | */ |
753c4dd6 MS |
792 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
793 | (tracehook_report_syscall_entry(regs) || | |
794 | regs->gprs[2] >= NR_syscalls)) { | |
795 | /* | |
796 | * Tracing decided this syscall should not happen or the | |
797 | * debugger stored an invalid system call number. Skip | |
798 | * the system call and the system call restart handling. | |
799 | */ | |
b6ef5bb3 | 800 | clear_thread_flag(TIF_SYSCALL); |
753c4dd6 | 801 | ret = -1; |
1da177e4 | 802 | } |
753c4dd6 | 803 | |
66700001 | 804 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 805 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 806 | |
b05d8447 EP |
807 | audit_syscall_entry(is_compat_task() ? |
808 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, | |
809 | regs->gprs[2], regs->orig_gpr2, | |
810 | regs->gprs[3], regs->gprs[4], | |
811 | regs->gprs[5]); | |
c63cb468 | 812 | out: |
545c174d | 813 | return ret ?: regs->gprs[2]; |
753c4dd6 MS |
814 | } |
815 | ||
816 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
817 | { | |
d7e7528b | 818 | audit_syscall_exit(regs); |
753c4dd6 | 819 | |
66700001 | 820 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 821 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 822 | |
753c4dd6 MS |
823 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
824 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 825 | } |
63506c41 MS |
826 | |
827 | /* | |
828 | * user_regset definitions. | |
829 | */ | |
830 | ||
831 | static int s390_regs_get(struct task_struct *target, | |
832 | const struct user_regset *regset, | |
833 | unsigned int pos, unsigned int count, | |
834 | void *kbuf, void __user *ubuf) | |
835 | { | |
836 | if (target == current) | |
837 | save_access_regs(target->thread.acrs); | |
838 | ||
839 | if (kbuf) { | |
840 | unsigned long *k = kbuf; | |
841 | while (count > 0) { | |
842 | *k++ = __peek_user(target, pos); | |
843 | count -= sizeof(*k); | |
844 | pos += sizeof(*k); | |
845 | } | |
846 | } else { | |
847 | unsigned long __user *u = ubuf; | |
848 | while (count > 0) { | |
849 | if (__put_user(__peek_user(target, pos), u++)) | |
850 | return -EFAULT; | |
851 | count -= sizeof(*u); | |
852 | pos += sizeof(*u); | |
853 | } | |
854 | } | |
855 | return 0; | |
856 | } | |
857 | ||
858 | static int s390_regs_set(struct task_struct *target, | |
859 | const struct user_regset *regset, | |
860 | unsigned int pos, unsigned int count, | |
861 | const void *kbuf, const void __user *ubuf) | |
862 | { | |
863 | int rc = 0; | |
864 | ||
865 | if (target == current) | |
866 | save_access_regs(target->thread.acrs); | |
867 | ||
868 | if (kbuf) { | |
869 | const unsigned long *k = kbuf; | |
870 | while (count > 0 && !rc) { | |
871 | rc = __poke_user(target, pos, *k++); | |
872 | count -= sizeof(*k); | |
873 | pos += sizeof(*k); | |
874 | } | |
875 | } else { | |
876 | const unsigned long __user *u = ubuf; | |
877 | while (count > 0 && !rc) { | |
878 | unsigned long word; | |
879 | rc = __get_user(word, u++); | |
880 | if (rc) | |
881 | break; | |
882 | rc = __poke_user(target, pos, word); | |
883 | count -= sizeof(*u); | |
884 | pos += sizeof(*u); | |
885 | } | |
886 | } | |
887 | ||
888 | if (rc == 0 && target == current) | |
889 | restore_access_regs(target->thread.acrs); | |
890 | ||
891 | return rc; | |
892 | } | |
893 | ||
894 | static int s390_fpregs_get(struct task_struct *target, | |
895 | const struct user_regset *regset, unsigned int pos, | |
896 | unsigned int count, void *kbuf, void __user *ubuf) | |
897 | { | |
898 | if (target == current) | |
899 | save_fp_regs(&target->thread.fp_regs); | |
900 | ||
901 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
902 | &target->thread.fp_regs, 0, -1); | |
903 | } | |
904 | ||
905 | static int s390_fpregs_set(struct task_struct *target, | |
906 | const struct user_regset *regset, unsigned int pos, | |
907 | unsigned int count, const void *kbuf, | |
908 | const void __user *ubuf) | |
909 | { | |
910 | int rc = 0; | |
911 | ||
912 | if (target == current) | |
913 | save_fp_regs(&target->thread.fp_regs); | |
914 | ||
915 | /* If setting FPC, must validate it first. */ | |
916 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
917 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
918 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
919 | 0, offsetof(s390_fp_regs, fprs)); | |
920 | if (rc) | |
921 | return rc; | |
922 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
923 | return -EINVAL; | |
924 | target->thread.fp_regs.fpc = fpc[0]; | |
925 | } | |
926 | ||
927 | if (rc == 0 && count > 0) | |
928 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
929 | target->thread.fp_regs.fprs, | |
930 | offsetof(s390_fp_regs, fprs), -1); | |
931 | ||
932 | if (rc == 0 && target == current) | |
933 | restore_fp_regs(&target->thread.fp_regs); | |
934 | ||
935 | return rc; | |
936 | } | |
937 | ||
86f2552b MS |
938 | #ifdef CONFIG_64BIT |
939 | ||
940 | static int s390_last_break_get(struct task_struct *target, | |
941 | const struct user_regset *regset, | |
942 | unsigned int pos, unsigned int count, | |
943 | void *kbuf, void __user *ubuf) | |
944 | { | |
945 | if (count > 0) { | |
946 | if (kbuf) { | |
947 | unsigned long *k = kbuf; | |
948 | *k = task_thread_info(target)->last_break; | |
949 | } else { | |
950 | unsigned long __user *u = ubuf; | |
951 | if (__put_user(task_thread_info(target)->last_break, u)) | |
952 | return -EFAULT; | |
953 | } | |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
b934069c MS |
958 | static int s390_last_break_set(struct task_struct *target, |
959 | const struct user_regset *regset, | |
960 | unsigned int pos, unsigned int count, | |
961 | const void *kbuf, const void __user *ubuf) | |
962 | { | |
963 | return 0; | |
964 | } | |
965 | ||
d35339a4 MS |
966 | static int s390_tdb_get(struct task_struct *target, |
967 | const struct user_regset *regset, | |
968 | unsigned int pos, unsigned int count, | |
969 | void *kbuf, void __user *ubuf) | |
970 | { | |
971 | struct pt_regs *regs = task_pt_regs(target); | |
972 | unsigned char *data; | |
973 | ||
974 | if (!(regs->int_code & 0x200)) | |
975 | return -ENODATA; | |
976 | data = target->thread.trap_tdb; | |
977 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
978 | } | |
979 | ||
980 | static int s390_tdb_set(struct task_struct *target, | |
981 | const struct user_regset *regset, | |
982 | unsigned int pos, unsigned int count, | |
983 | const void *kbuf, const void __user *ubuf) | |
984 | { | |
985 | return 0; | |
986 | } | |
987 | ||
86f2552b MS |
988 | #endif |
989 | ||
20b40a79 MS |
990 | static int s390_system_call_get(struct task_struct *target, |
991 | const struct user_regset *regset, | |
992 | unsigned int pos, unsigned int count, | |
993 | void *kbuf, void __user *ubuf) | |
994 | { | |
995 | unsigned int *data = &task_thread_info(target)->system_call; | |
996 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
997 | data, 0, sizeof(unsigned int)); | |
998 | } | |
999 | ||
1000 | static int s390_system_call_set(struct task_struct *target, | |
1001 | const struct user_regset *regset, | |
1002 | unsigned int pos, unsigned int count, | |
1003 | const void *kbuf, const void __user *ubuf) | |
1004 | { | |
1005 | unsigned int *data = &task_thread_info(target)->system_call; | |
1006 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
1007 | data, 0, sizeof(unsigned int)); | |
1008 | } | |
1009 | ||
63506c41 MS |
1010 | static const struct user_regset s390_regsets[] = { |
1011 | [REGSET_GENERAL] = { | |
1012 | .core_note_type = NT_PRSTATUS, | |
1013 | .n = sizeof(s390_regs) / sizeof(long), | |
1014 | .size = sizeof(long), | |
1015 | .align = sizeof(long), | |
1016 | .get = s390_regs_get, | |
1017 | .set = s390_regs_set, | |
1018 | }, | |
1019 | [REGSET_FP] = { | |
1020 | .core_note_type = NT_PRFPREG, | |
1021 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
1022 | .size = sizeof(long), | |
1023 | .align = sizeof(long), | |
1024 | .get = s390_fpregs_get, | |
1025 | .set = s390_fpregs_set, | |
1026 | }, | |
86f2552b MS |
1027 | #ifdef CONFIG_64BIT |
1028 | [REGSET_LAST_BREAK] = { | |
1029 | .core_note_type = NT_S390_LAST_BREAK, | |
1030 | .n = 1, | |
1031 | .size = sizeof(long), | |
1032 | .align = sizeof(long), | |
1033 | .get = s390_last_break_get, | |
b934069c | 1034 | .set = s390_last_break_set, |
86f2552b | 1035 | }, |
d35339a4 MS |
1036 | [REGSET_TDB] = { |
1037 | .core_note_type = NT_S390_TDB, | |
1038 | .n = 1, | |
1039 | .size = 256, | |
1040 | .align = 1, | |
1041 | .get = s390_tdb_get, | |
1042 | .set = s390_tdb_set, | |
1043 | }, | |
86f2552b | 1044 | #endif |
20b40a79 MS |
1045 | [REGSET_SYSTEM_CALL] = { |
1046 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1047 | .n = 1, | |
1048 | .size = sizeof(unsigned int), | |
1049 | .align = sizeof(unsigned int), | |
1050 | .get = s390_system_call_get, | |
1051 | .set = s390_system_call_set, | |
1052 | }, | |
63506c41 MS |
1053 | }; |
1054 | ||
1055 | static const struct user_regset_view user_s390_view = { | |
1056 | .name = UTS_MACHINE, | |
1057 | .e_machine = EM_S390, | |
1058 | .regsets = s390_regsets, | |
1059 | .n = ARRAY_SIZE(s390_regsets) | |
1060 | }; | |
1061 | ||
1062 | #ifdef CONFIG_COMPAT | |
1063 | static int s390_compat_regs_get(struct task_struct *target, | |
1064 | const struct user_regset *regset, | |
1065 | unsigned int pos, unsigned int count, | |
1066 | void *kbuf, void __user *ubuf) | |
1067 | { | |
1068 | if (target == current) | |
1069 | save_access_regs(target->thread.acrs); | |
1070 | ||
1071 | if (kbuf) { | |
1072 | compat_ulong_t *k = kbuf; | |
1073 | while (count > 0) { | |
1074 | *k++ = __peek_user_compat(target, pos); | |
1075 | count -= sizeof(*k); | |
1076 | pos += sizeof(*k); | |
1077 | } | |
1078 | } else { | |
1079 | compat_ulong_t __user *u = ubuf; | |
1080 | while (count > 0) { | |
1081 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1082 | return -EFAULT; | |
1083 | count -= sizeof(*u); | |
1084 | pos += sizeof(*u); | |
1085 | } | |
1086 | } | |
1087 | return 0; | |
1088 | } | |
1089 | ||
1090 | static int s390_compat_regs_set(struct task_struct *target, | |
1091 | const struct user_regset *regset, | |
1092 | unsigned int pos, unsigned int count, | |
1093 | const void *kbuf, const void __user *ubuf) | |
1094 | { | |
1095 | int rc = 0; | |
1096 | ||
1097 | if (target == current) | |
1098 | save_access_regs(target->thread.acrs); | |
1099 | ||
1100 | if (kbuf) { | |
1101 | const compat_ulong_t *k = kbuf; | |
1102 | while (count > 0 && !rc) { | |
1103 | rc = __poke_user_compat(target, pos, *k++); | |
1104 | count -= sizeof(*k); | |
1105 | pos += sizeof(*k); | |
1106 | } | |
1107 | } else { | |
1108 | const compat_ulong_t __user *u = ubuf; | |
1109 | while (count > 0 && !rc) { | |
1110 | compat_ulong_t word; | |
1111 | rc = __get_user(word, u++); | |
1112 | if (rc) | |
1113 | break; | |
1114 | rc = __poke_user_compat(target, pos, word); | |
1115 | count -= sizeof(*u); | |
1116 | pos += sizeof(*u); | |
1117 | } | |
1118 | } | |
1119 | ||
1120 | if (rc == 0 && target == current) | |
1121 | restore_access_regs(target->thread.acrs); | |
1122 | ||
1123 | return rc; | |
1124 | } | |
1125 | ||
ea2a4d3a HC |
1126 | static int s390_compat_regs_high_get(struct task_struct *target, |
1127 | const struct user_regset *regset, | |
1128 | unsigned int pos, unsigned int count, | |
1129 | void *kbuf, void __user *ubuf) | |
1130 | { | |
1131 | compat_ulong_t *gprs_high; | |
1132 | ||
1133 | gprs_high = (compat_ulong_t *) | |
1134 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1135 | if (kbuf) { | |
1136 | compat_ulong_t *k = kbuf; | |
1137 | while (count > 0) { | |
1138 | *k++ = *gprs_high; | |
1139 | gprs_high += 2; | |
1140 | count -= sizeof(*k); | |
1141 | } | |
1142 | } else { | |
1143 | compat_ulong_t __user *u = ubuf; | |
1144 | while (count > 0) { | |
1145 | if (__put_user(*gprs_high, u++)) | |
1146 | return -EFAULT; | |
1147 | gprs_high += 2; | |
1148 | count -= sizeof(*u); | |
1149 | } | |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1155 | const struct user_regset *regset, | |
1156 | unsigned int pos, unsigned int count, | |
1157 | const void *kbuf, const void __user *ubuf) | |
1158 | { | |
1159 | compat_ulong_t *gprs_high; | |
1160 | int rc = 0; | |
1161 | ||
1162 | gprs_high = (compat_ulong_t *) | |
1163 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1164 | if (kbuf) { | |
1165 | const compat_ulong_t *k = kbuf; | |
1166 | while (count > 0) { | |
1167 | *gprs_high = *k++; | |
1168 | *gprs_high += 2; | |
1169 | count -= sizeof(*k); | |
1170 | } | |
1171 | } else { | |
1172 | const compat_ulong_t __user *u = ubuf; | |
1173 | while (count > 0 && !rc) { | |
1174 | unsigned long word; | |
1175 | rc = __get_user(word, u++); | |
1176 | if (rc) | |
1177 | break; | |
1178 | *gprs_high = word; | |
1179 | *gprs_high += 2; | |
1180 | count -= sizeof(*u); | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | return rc; | |
1185 | } | |
1186 | ||
86f2552b MS |
1187 | static int s390_compat_last_break_get(struct task_struct *target, |
1188 | const struct user_regset *regset, | |
1189 | unsigned int pos, unsigned int count, | |
1190 | void *kbuf, void __user *ubuf) | |
1191 | { | |
1192 | compat_ulong_t last_break; | |
1193 | ||
1194 | if (count > 0) { | |
1195 | last_break = task_thread_info(target)->last_break; | |
1196 | if (kbuf) { | |
1197 | unsigned long *k = kbuf; | |
1198 | *k = last_break; | |
1199 | } else { | |
1200 | unsigned long __user *u = ubuf; | |
1201 | if (__put_user(last_break, u)) | |
1202 | return -EFAULT; | |
1203 | } | |
1204 | } | |
1205 | return 0; | |
1206 | } | |
1207 | ||
b934069c MS |
1208 | static int s390_compat_last_break_set(struct task_struct *target, |
1209 | const struct user_regset *regset, | |
1210 | unsigned int pos, unsigned int count, | |
1211 | const void *kbuf, const void __user *ubuf) | |
1212 | { | |
1213 | return 0; | |
1214 | } | |
1215 | ||
63506c41 MS |
1216 | static const struct user_regset s390_compat_regsets[] = { |
1217 | [REGSET_GENERAL] = { | |
1218 | .core_note_type = NT_PRSTATUS, | |
1219 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1220 | .size = sizeof(compat_long_t), | |
1221 | .align = sizeof(compat_long_t), | |
1222 | .get = s390_compat_regs_get, | |
1223 | .set = s390_compat_regs_set, | |
1224 | }, | |
1225 | [REGSET_FP] = { | |
1226 | .core_note_type = NT_PRFPREG, | |
1227 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1228 | .size = sizeof(compat_long_t), | |
1229 | .align = sizeof(compat_long_t), | |
1230 | .get = s390_fpregs_get, | |
1231 | .set = s390_fpregs_set, | |
1232 | }, | |
86f2552b MS |
1233 | [REGSET_LAST_BREAK] = { |
1234 | .core_note_type = NT_S390_LAST_BREAK, | |
1235 | .n = 1, | |
1236 | .size = sizeof(long), | |
1237 | .align = sizeof(long), | |
1238 | .get = s390_compat_last_break_get, | |
b934069c | 1239 | .set = s390_compat_last_break_set, |
86f2552b | 1240 | }, |
d35339a4 MS |
1241 | [REGSET_TDB] = { |
1242 | .core_note_type = NT_S390_TDB, | |
1243 | .n = 1, | |
1244 | .size = 256, | |
1245 | .align = 1, | |
1246 | .get = s390_tdb_get, | |
1247 | .set = s390_tdb_set, | |
1248 | }, | |
20b40a79 MS |
1249 | [REGSET_SYSTEM_CALL] = { |
1250 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1251 | .n = 1, | |
1252 | .size = sizeof(compat_uint_t), | |
1253 | .align = sizeof(compat_uint_t), | |
1254 | .get = s390_system_call_get, | |
1255 | .set = s390_system_call_set, | |
1256 | }, | |
ea2a4d3a | 1257 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 1258 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1259 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1260 | .size = sizeof(compat_long_t), | |
1261 | .align = sizeof(compat_long_t), | |
1262 | .get = s390_compat_regs_high_get, | |
1263 | .set = s390_compat_regs_high_set, | |
1264 | }, | |
63506c41 MS |
1265 | }; |
1266 | ||
1267 | static const struct user_regset_view user_s390_compat_view = { | |
1268 | .name = "s390", | |
1269 | .e_machine = EM_S390, | |
1270 | .regsets = s390_compat_regsets, | |
1271 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1272 | }; | |
1273 | #endif | |
1274 | ||
1275 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1276 | { | |
1277 | #ifdef CONFIG_COMPAT | |
1278 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1279 | return &user_s390_compat_view; | |
1280 | #endif | |
1281 | return &user_s390_view; | |
1282 | } | |
952974ac HC |
1283 | |
1284 | static const char *gpr_names[NUM_GPRS] = { | |
1285 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1286 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1287 | }; | |
1288 | ||
1289 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1290 | { | |
1291 | if (offset >= NUM_GPRS) | |
1292 | return 0; | |
1293 | return regs->gprs[offset]; | |
1294 | } | |
1295 | ||
1296 | int regs_query_register_offset(const char *name) | |
1297 | { | |
1298 | unsigned long offset; | |
1299 | ||
1300 | if (!name || *name != 'r') | |
1301 | return -EINVAL; | |
958d9072 | 1302 | if (kstrtoul(name + 1, 10, &offset)) |
952974ac HC |
1303 | return -EINVAL; |
1304 | if (offset >= NUM_GPRS) | |
1305 | return -EINVAL; | |
1306 | return offset; | |
1307 | } | |
1308 | ||
1309 | const char *regs_query_register_name(unsigned int offset) | |
1310 | { | |
1311 | if (offset >= NUM_GPRS) | |
1312 | return NULL; | |
1313 | return gpr_names[offset]; | |
1314 | } | |
1315 | ||
1316 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1317 | { | |
1318 | unsigned long ksp = kernel_stack_pointer(regs); | |
1319 | ||
1320 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1321 | } | |
1322 | ||
1323 | /** | |
1324 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1325 | * @regs:pt_regs which contains kernel stack pointer. | |
1326 | * @n:stack entry number. | |
1327 | * | |
1328 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1329 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1330 | * this returns 0. | |
1331 | */ | |
1332 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1333 | { | |
1334 | unsigned long addr; | |
1335 | ||
1336 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1337 | if (!regs_within_kernel_stack(regs, addr)) | |
1338 | return 0; | |
1339 | return *(unsigned long *)addr; | |
1340 | } |