Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/ptrace.c | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), | |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
8 | * | |
9 | * Based on PowerPC version | |
10 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
11 | * | |
12 | * Derived from "arch/m68k/kernel/ptrace.c" | |
13 | * Copyright (C) 1994 by Hamish Macdonald | |
14 | * Taken from linux/kernel/ptrace.c and modified for M680x0. | |
15 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds | |
16 | * | |
17 | * Modified by Cort Dougan (cort@cs.nmt.edu) | |
18 | * | |
19 | * | |
20 | * This file is subject to the terms and conditions of the GNU General | |
21 | * Public License. See the file README.legal in the main directory of | |
22 | * this archive for more details. | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/smp.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/user.h> | |
33 | #include <linux/security.h> | |
34 | #include <linux/audit.h> | |
7ed20e1a | 35 | #include <linux/signal.h> |
63506c41 MS |
36 | #include <linux/elf.h> |
37 | #include <linux/regset.h> | |
753c4dd6 | 38 | #include <linux/tracehook.h> |
bcf5cef7 HC |
39 | #include <linux/seccomp.h> |
40 | #include <asm/compat.h> | |
1da177e4 LT |
41 | #include <asm/segment.h> |
42 | #include <asm/page.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/system.h> | |
46 | #include <asm/uaccess.h> | |
778959db | 47 | #include <asm/unistd.h> |
a806170e | 48 | #include "entry.h" |
1da177e4 | 49 | |
347a8dc3 | 50 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
51 | #include "compat_ptrace.h" |
52 | #endif | |
53 | ||
63506c41 MS |
54 | enum s390_regset { |
55 | REGSET_GENERAL, | |
56 | REGSET_FP, | |
57 | }; | |
58 | ||
1da177e4 LT |
59 | static void |
60 | FixPerRegisters(struct task_struct *task) | |
61 | { | |
62 | struct pt_regs *regs; | |
63 | per_struct *per_info; | |
64 | ||
c7584fb6 | 65 | regs = task_pt_regs(task); |
1da177e4 LT |
66 | per_info = (per_struct *) &task->thread.per_info; |
67 | per_info->control_regs.bits.em_instruction_fetch = | |
68 | per_info->single_step | per_info->instruction_fetch; | |
69 | ||
70 | if (per_info->single_step) { | |
71 | per_info->control_regs.bits.starting_addr = 0; | |
347a8dc3 | 72 | #ifdef CONFIG_COMPAT |
7757591a | 73 | if (is_compat_task()) |
1da177e4 LT |
74 | per_info->control_regs.bits.ending_addr = 0x7fffffffUL; |
75 | else | |
76 | #endif | |
77 | per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; | |
78 | } else { | |
79 | per_info->control_regs.bits.starting_addr = | |
80 | per_info->starting_addr; | |
81 | per_info->control_regs.bits.ending_addr = | |
82 | per_info->ending_addr; | |
83 | } | |
84 | /* | |
85 | * if any of the control reg tracing bits are on | |
86 | * we switch on per in the psw | |
87 | */ | |
88 | if (per_info->control_regs.words.cr[0] & PER_EM_MASK) | |
89 | regs->psw.mask |= PSW_MASK_PER; | |
90 | else | |
91 | regs->psw.mask &= ~PSW_MASK_PER; | |
92 | ||
93 | if (per_info->control_regs.bits.em_storage_alteration) | |
94 | per_info->control_regs.bits.storage_alt_space_ctl = 1; | |
95 | else | |
96 | per_info->control_regs.bits.storage_alt_space_ctl = 0; | |
97 | } | |
98 | ||
0ac30be4 | 99 | void user_enable_single_step(struct task_struct *task) |
1da177e4 LT |
100 | { |
101 | task->thread.per_info.single_step = 1; | |
102 | FixPerRegisters(task); | |
103 | } | |
104 | ||
0ac30be4 | 105 | void user_disable_single_step(struct task_struct *task) |
1da177e4 LT |
106 | { |
107 | task->thread.per_info.single_step = 0; | |
108 | FixPerRegisters(task); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Called by kernel/ptrace.c when detaching.. | |
113 | * | |
114 | * Make sure single step bits etc are not set. | |
115 | */ | |
116 | void | |
117 | ptrace_disable(struct task_struct *child) | |
118 | { | |
119 | /* make sure the single step bit is not set. */ | |
0ac30be4 | 120 | user_disable_single_step(child); |
1da177e4 LT |
121 | } |
122 | ||
347a8dc3 | 123 | #ifndef CONFIG_64BIT |
1da177e4 LT |
124 | # define __ADDR_MASK 3 |
125 | #else | |
126 | # define __ADDR_MASK 7 | |
127 | #endif | |
128 | ||
129 | /* | |
130 | * Read the word at offset addr from the user area of a process. The | |
131 | * trouble here is that the information is littered over different | |
132 | * locations. The process registers are found on the kernel stack, | |
133 | * the floating point stuff and the trace settings are stored in | |
134 | * the task structure. In addition the different structures in | |
135 | * struct user contain pad bytes that should be read as zeroes. | |
136 | * Lovely... | |
137 | */ | |
63506c41 | 138 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
139 | { |
140 | struct user *dummy = NULL; | |
63506c41 | 141 | addr_t offset, tmp; |
1da177e4 LT |
142 | |
143 | if (addr < (addr_t) &dummy->regs.acrs) { | |
144 | /* | |
145 | * psw and gprs are stored on the stack | |
146 | */ | |
c7584fb6 | 147 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 LT |
148 | if (addr == (addr_t) &dummy->regs.psw.mask) |
149 | /* Remove per bit from user psw. */ | |
150 | tmp &= ~PSW_MASK_PER; | |
151 | ||
152 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
153 | /* | |
154 | * access registers are stored in the thread structure | |
155 | */ | |
156 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 157 | #ifdef CONFIG_64BIT |
778959db MS |
158 | /* |
159 | * Very special case: old & broken 64 bit gdb reading | |
160 | * from acrs[15]. Result is a 64 bit value. Read the | |
161 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
162 | */ | |
163 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
164 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
165 | else | |
166 | #endif | |
1da177e4 LT |
167 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
168 | ||
169 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
170 | /* | |
171 | * orig_gpr2 is stored on the kernel stack | |
172 | */ | |
c7584fb6 | 173 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 174 | |
3d6e48f4 JW |
175 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
176 | /* | |
177 | * prevent reads of padding hole between | |
178 | * orig_gpr2 and fp_regs on s390. | |
179 | */ | |
180 | tmp = 0; | |
181 | ||
1da177e4 LT |
182 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
183 | /* | |
184 | * floating point regs. are stored in the thread structure | |
185 | */ | |
186 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
187 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
188 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
189 | tmp &= (unsigned long) FPC_VALID_MASK | |
190 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
191 | |
192 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
193 | /* | |
194 | * per_info is found in the thread structure | |
195 | */ | |
196 | offset = addr - (addr_t) &dummy->regs.per_info; | |
197 | tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); | |
198 | ||
199 | } else | |
200 | tmp = 0; | |
201 | ||
63506c41 | 202 | return tmp; |
1da177e4 LT |
203 | } |
204 | ||
1da177e4 | 205 | static int |
63506c41 | 206 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 207 | { |
63506c41 | 208 | addr_t tmp, mask; |
1da177e4 LT |
209 | |
210 | /* | |
211 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 212 | * an alignment of 4. Programmers from hell... |
1da177e4 | 213 | */ |
778959db | 214 | mask = __ADDR_MASK; |
347a8dc3 | 215 | #ifdef CONFIG_64BIT |
547e3cec MS |
216 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
217 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
218 | mask = 3; |
219 | #endif | |
220 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
221 | return -EIO; |
222 | ||
63506c41 MS |
223 | tmp = __peek_user(child, addr); |
224 | return put_user(tmp, (addr_t __user *) data); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Write a word to the user area of a process at location addr. This | |
229 | * operation does have an additional problem compared to peek_user. | |
230 | * Stores to the program status word and on the floating point | |
231 | * control register needs to get checked for validity. | |
232 | */ | |
233 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
234 | { | |
235 | struct user *dummy = NULL; | |
236 | addr_t offset; | |
237 | ||
1da177e4 LT |
238 | if (addr < (addr_t) &dummy->regs.acrs) { |
239 | /* | |
240 | * psw and gprs are stored on the stack | |
241 | */ | |
242 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
347a8dc3 | 243 | #ifdef CONFIG_COMPAT |
c1821c2e | 244 | data != PSW_MASK_MERGE(psw_user32_bits, data) && |
1da177e4 | 245 | #endif |
c1821c2e | 246 | data != PSW_MASK_MERGE(psw_user_bits, data)) |
1da177e4 LT |
247 | /* Invalid psw mask. */ |
248 | return -EINVAL; | |
347a8dc3 | 249 | #ifndef CONFIG_64BIT |
1da177e4 LT |
250 | if (addr == (addr_t) &dummy->regs.psw.addr) |
251 | /* I'd like to reject addresses without the | |
252 | high order bit but older gdb's rely on it */ | |
253 | data |= PSW_ADDR_AMODE; | |
254 | #endif | |
c7584fb6 | 255 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
256 | |
257 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
258 | /* | |
259 | * access registers are stored in the thread structure | |
260 | */ | |
261 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 262 | #ifdef CONFIG_64BIT |
778959db MS |
263 | /* |
264 | * Very special case: old & broken 64 bit gdb writing | |
265 | * to acrs[15] with a 64 bit value. Ignore the lower | |
266 | * half of the value and write the upper 32 bit to | |
267 | * acrs[15]. Sick... | |
268 | */ | |
269 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
270 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
271 | else | |
272 | #endif | |
1da177e4 LT |
273 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
274 | ||
275 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
276 | /* | |
277 | * orig_gpr2 is stored on the kernel stack | |
278 | */ | |
c7584fb6 | 279 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 280 | |
3d6e48f4 JW |
281 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
282 | /* | |
283 | * prevent writes of padding hole between | |
284 | * orig_gpr2 and fp_regs on s390. | |
285 | */ | |
286 | return 0; | |
287 | ||
1da177e4 LT |
288 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
289 | /* | |
290 | * floating point regs. are stored in the thread structure | |
291 | */ | |
292 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
293 | (data & ~((unsigned long) FPC_VALID_MASK |
294 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
295 | return -EINVAL; |
296 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
297 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
298 | ||
299 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
300 | /* | |
301 | * per_info is found in the thread structure | |
302 | */ | |
303 | offset = addr - (addr_t) &dummy->regs.per_info; | |
304 | *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; | |
305 | ||
306 | } | |
307 | ||
308 | FixPerRegisters(child); | |
309 | return 0; | |
310 | } | |
311 | ||
63506c41 MS |
312 | static int |
313 | poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
314 | { | |
63506c41 MS |
315 | addr_t mask; |
316 | ||
317 | /* | |
318 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
319 | * an alignment of 4. Programmers from hell indeed... | |
320 | */ | |
321 | mask = __ADDR_MASK; | |
322 | #ifdef CONFIG_64BIT | |
547e3cec MS |
323 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
324 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
325 | mask = 3; |
326 | #endif | |
327 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
328 | return -EIO; | |
329 | ||
330 | return __poke_user(child, addr, data); | |
331 | } | |
332 | ||
b499d76b | 333 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 334 | { |
1da177e4 LT |
335 | ptrace_area parea; |
336 | int copied, ret; | |
337 | ||
338 | switch (request) { | |
339 | case PTRACE_PEEKTEXT: | |
340 | case PTRACE_PEEKDATA: | |
341 | /* Remove high order bit from address (only for 31 bit). */ | |
342 | addr &= PSW_ADDR_INSN; | |
343 | /* read word at location addr. */ | |
76647323 | 344 | return generic_ptrace_peekdata(child, addr, data); |
1da177e4 LT |
345 | |
346 | case PTRACE_PEEKUSR: | |
347 | /* read the word at location addr in the USER area. */ | |
348 | return peek_user(child, addr, data); | |
349 | ||
350 | case PTRACE_POKETEXT: | |
351 | case PTRACE_POKEDATA: | |
352 | /* Remove high order bit from address (only for 31 bit). */ | |
353 | addr &= PSW_ADDR_INSN; | |
354 | /* write the word at location addr. */ | |
f284ce72 | 355 | return generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
356 | |
357 | case PTRACE_POKEUSR: | |
358 | /* write the word at location addr in the USER area */ | |
359 | return poke_user(child, addr, data); | |
360 | ||
361 | case PTRACE_PEEKUSR_AREA: | |
362 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 363 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
364 | sizeof(parea))) |
365 | return -EFAULT; | |
366 | addr = parea.kernel_addr; | |
367 | data = parea.process_addr; | |
368 | copied = 0; | |
369 | while (copied < parea.len) { | |
370 | if (request == PTRACE_PEEKUSR_AREA) | |
371 | ret = peek_user(child, addr, data); | |
372 | else { | |
2b67fc46 HC |
373 | addr_t utmp; |
374 | if (get_user(utmp, | |
375 | (addr_t __force __user *) data)) | |
1da177e4 | 376 | return -EFAULT; |
2b67fc46 | 377 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
378 | } |
379 | if (ret) | |
380 | return ret; | |
381 | addr += sizeof(unsigned long); | |
382 | data += sizeof(unsigned long); | |
383 | copied += sizeof(unsigned long); | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | return ptrace_request(child, request, addr, data); | |
388 | } | |
389 | ||
347a8dc3 | 390 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
391 | /* |
392 | * Now the fun part starts... a 31 bit program running in the | |
393 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
394 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
395 | * to handle, the difference to the 64 bit versions of the requests | |
396 | * is that the access is done in multiples of 4 byte instead of | |
397 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
398 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
399 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
400 | * is a 31 bit program too, the content of struct user can be | |
401 | * emulated. A 31 bit program peeking into the struct user of | |
402 | * a 64 bit program is a no-no. | |
403 | */ | |
404 | ||
405 | /* | |
406 | * Same as peek_user but for a 31 bit program. | |
407 | */ | |
63506c41 | 408 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 LT |
409 | { |
410 | struct user32 *dummy32 = NULL; | |
411 | per_struct32 *dummy_per32 = NULL; | |
412 | addr_t offset; | |
413 | __u32 tmp; | |
414 | ||
1da177e4 LT |
415 | if (addr < (addr_t) &dummy32->regs.acrs) { |
416 | /* | |
417 | * psw and gprs are stored on the stack | |
418 | */ | |
419 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
420 | /* Fake a 31 bit psw mask. */ | |
c7584fb6 | 421 | tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); |
c1821c2e | 422 | tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); |
1da177e4 LT |
423 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
424 | /* Fake a 31 bit psw address. */ | |
c7584fb6 | 425 | tmp = (__u32) task_pt_regs(child)->psw.addr | |
1da177e4 LT |
426 | PSW32_ADDR_AMODE31; |
427 | } else { | |
428 | /* gpr 0-15 */ | |
c7584fb6 | 429 | tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + |
1da177e4 LT |
430 | addr*2 + 4); |
431 | } | |
432 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
433 | /* | |
434 | * access registers are stored in the thread structure | |
435 | */ | |
436 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
437 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
438 | ||
439 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
440 | /* | |
441 | * orig_gpr2 is stored on the kernel stack | |
442 | */ | |
c7584fb6 | 443 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 444 | |
3d6e48f4 JW |
445 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
446 | /* | |
447 | * prevent reads of padding hole between | |
448 | * orig_gpr2 and fp_regs on s390. | |
449 | */ | |
450 | tmp = 0; | |
451 | ||
1da177e4 LT |
452 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
453 | /* | |
454 | * floating point regs. are stored in the thread structure | |
455 | */ | |
456 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
457 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
458 | ||
459 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
460 | /* | |
461 | * per_info is found in the thread structure | |
462 | */ | |
463 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
464 | /* This is magic. See per_struct and per_struct32. */ | |
465 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
466 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
467 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
468 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
469 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
470 | offset = offset*2 + 4; | |
471 | else | |
472 | offset = offset*2; | |
473 | tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); | |
474 | ||
475 | } else | |
476 | tmp = 0; | |
477 | ||
63506c41 MS |
478 | return tmp; |
479 | } | |
480 | ||
481 | static int peek_user_compat(struct task_struct *child, | |
482 | addr_t addr, addr_t data) | |
483 | { | |
484 | __u32 tmp; | |
485 | ||
7757591a | 486 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
487 | return -EIO; |
488 | ||
489 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
490 | return put_user(tmp, (__u32 __user *) data); |
491 | } | |
492 | ||
493 | /* | |
494 | * Same as poke_user but for a 31 bit program. | |
495 | */ | |
63506c41 MS |
496 | static int __poke_user_compat(struct task_struct *child, |
497 | addr_t addr, addr_t data) | |
1da177e4 LT |
498 | { |
499 | struct user32 *dummy32 = NULL; | |
500 | per_struct32 *dummy_per32 = NULL; | |
63506c41 | 501 | __u32 tmp = (__u32) data; |
1da177e4 | 502 | addr_t offset; |
1da177e4 LT |
503 | |
504 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
505 | /* | |
506 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
507 | */ | |
508 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
509 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
c1821c2e | 510 | if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) |
1da177e4 LT |
511 | /* Invalid psw mask. */ |
512 | return -EINVAL; | |
c7584fb6 | 513 | task_pt_regs(child)->psw.mask = |
c1821c2e | 514 | PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); |
1da177e4 LT |
515 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
516 | /* Build a 64 bit psw address from 31 bit address. */ | |
c7584fb6 | 517 | task_pt_regs(child)->psw.addr = |
1da177e4 LT |
518 | (__u64) tmp & PSW32_ADDR_INSN; |
519 | } else { | |
520 | /* gpr 0-15 */ | |
c7584fb6 | 521 | *(__u32*)((addr_t) &task_pt_regs(child)->psw |
1da177e4 LT |
522 | + addr*2 + 4) = tmp; |
523 | } | |
524 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
525 | /* | |
526 | * access registers are stored in the thread structure | |
527 | */ | |
528 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
529 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
530 | ||
531 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
532 | /* | |
533 | * orig_gpr2 is stored on the kernel stack | |
534 | */ | |
c7584fb6 | 535 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 536 | |
3d6e48f4 JW |
537 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
538 | /* | |
539 | * prevent writess of padding hole between | |
540 | * orig_gpr2 and fp_regs on s390. | |
541 | */ | |
542 | return 0; | |
543 | ||
1da177e4 LT |
544 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
545 | /* | |
546 | * floating point regs. are stored in the thread structure | |
547 | */ | |
548 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
549 | (tmp & ~FPC_VALID_MASK) != 0) | |
550 | /* Invalid floating point control. */ | |
551 | return -EINVAL; | |
552 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
553 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
554 | ||
555 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
556 | /* | |
557 | * per_info is found in the thread structure. | |
558 | */ | |
559 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
560 | /* | |
561 | * This is magic. See per_struct and per_struct32. | |
562 | * By incident the offsets in per_struct are exactly | |
563 | * twice the offsets in per_struct32 for all fields. | |
564 | * The 8 byte fields need special handling though, | |
565 | * because the second half (bytes 4-7) is needed and | |
566 | * not the first half. | |
567 | */ | |
568 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
569 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
570 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
571 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
572 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
573 | offset = offset*2 + 4; | |
574 | else | |
575 | offset = offset*2; | |
576 | *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; | |
577 | ||
578 | } | |
579 | ||
580 | FixPerRegisters(child); | |
581 | return 0; | |
582 | } | |
583 | ||
63506c41 MS |
584 | static int poke_user_compat(struct task_struct *child, |
585 | addr_t addr, addr_t data) | |
586 | { | |
7757591a | 587 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) |
63506c41 MS |
588 | return -EIO; |
589 | ||
590 | return __poke_user_compat(child, addr, data); | |
591 | } | |
592 | ||
b499d76b RM |
593 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
594 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 595 | { |
b499d76b RM |
596 | unsigned long addr = caddr; |
597 | unsigned long data = cdata; | |
1da177e4 LT |
598 | ptrace_area_emu31 parea; |
599 | int copied, ret; | |
600 | ||
601 | switch (request) { | |
1da177e4 LT |
602 | case PTRACE_PEEKUSR: |
603 | /* read the word at location addr in the USER area. */ | |
63506c41 | 604 | return peek_user_compat(child, addr, data); |
1da177e4 | 605 | |
1da177e4 LT |
606 | case PTRACE_POKEUSR: |
607 | /* write the word at location addr in the USER area */ | |
63506c41 | 608 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
609 | |
610 | case PTRACE_PEEKUSR_AREA: | |
611 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 612 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
613 | sizeof(parea))) |
614 | return -EFAULT; | |
615 | addr = parea.kernel_addr; | |
616 | data = parea.process_addr; | |
617 | copied = 0; | |
618 | while (copied < parea.len) { | |
619 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 620 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 621 | else { |
2b67fc46 HC |
622 | __u32 utmp; |
623 | if (get_user(utmp, | |
624 | (__u32 __force __user *) data)) | |
1da177e4 | 625 | return -EFAULT; |
63506c41 | 626 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
627 | } |
628 | if (ret) | |
629 | return ret; | |
630 | addr += sizeof(unsigned int); | |
631 | data += sizeof(unsigned int); | |
632 | copied += sizeof(unsigned int); | |
633 | } | |
634 | return 0; | |
1da177e4 | 635 | } |
b499d76b | 636 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
637 | } |
638 | #endif | |
639 | ||
753c4dd6 | 640 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 641 | { |
753c4dd6 | 642 | long ret; |
1da177e4 | 643 | |
bcf5cef7 HC |
644 | /* Do the secure computing check first. */ |
645 | secure_computing(regs->gprs[2]); | |
646 | ||
c5c3a6d8 | 647 | /* |
753c4dd6 MS |
648 | * The sysc_tracesys code in entry.S stored the system |
649 | * call number to gprs[2]. | |
c5c3a6d8 | 650 | */ |
753c4dd6 MS |
651 | ret = regs->gprs[2]; |
652 | if (test_thread_flag(TIF_SYSCALL_TRACE) && | |
653 | (tracehook_report_syscall_entry(regs) || | |
654 | regs->gprs[2] >= NR_syscalls)) { | |
655 | /* | |
656 | * Tracing decided this syscall should not happen or the | |
657 | * debugger stored an invalid system call number. Skip | |
658 | * the system call and the system call restart handling. | |
659 | */ | |
59da2139 | 660 | regs->svcnr = 0; |
753c4dd6 | 661 | ret = -1; |
1da177e4 | 662 | } |
753c4dd6 MS |
663 | |
664 | if (unlikely(current->audit_context)) | |
7757591a | 665 | audit_syscall_entry(is_compat_task() ? |
753c4dd6 MS |
666 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, |
667 | regs->gprs[2], regs->orig_gpr2, | |
668 | regs->gprs[3], regs->gprs[4], | |
669 | regs->gprs[5]); | |
670 | return ret; | |
671 | } | |
672 | ||
673 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
674 | { | |
675 | if (unlikely(current->audit_context)) | |
676 | audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), | |
677 | regs->gprs[2]); | |
678 | ||
679 | if (test_thread_flag(TIF_SYSCALL_TRACE)) | |
680 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 681 | } |
63506c41 MS |
682 | |
683 | /* | |
684 | * user_regset definitions. | |
685 | */ | |
686 | ||
687 | static int s390_regs_get(struct task_struct *target, | |
688 | const struct user_regset *regset, | |
689 | unsigned int pos, unsigned int count, | |
690 | void *kbuf, void __user *ubuf) | |
691 | { | |
692 | if (target == current) | |
693 | save_access_regs(target->thread.acrs); | |
694 | ||
695 | if (kbuf) { | |
696 | unsigned long *k = kbuf; | |
697 | while (count > 0) { | |
698 | *k++ = __peek_user(target, pos); | |
699 | count -= sizeof(*k); | |
700 | pos += sizeof(*k); | |
701 | } | |
702 | } else { | |
703 | unsigned long __user *u = ubuf; | |
704 | while (count > 0) { | |
705 | if (__put_user(__peek_user(target, pos), u++)) | |
706 | return -EFAULT; | |
707 | count -= sizeof(*u); | |
708 | pos += sizeof(*u); | |
709 | } | |
710 | } | |
711 | return 0; | |
712 | } | |
713 | ||
714 | static int s390_regs_set(struct task_struct *target, | |
715 | const struct user_regset *regset, | |
716 | unsigned int pos, unsigned int count, | |
717 | const void *kbuf, const void __user *ubuf) | |
718 | { | |
719 | int rc = 0; | |
720 | ||
721 | if (target == current) | |
722 | save_access_regs(target->thread.acrs); | |
723 | ||
724 | if (kbuf) { | |
725 | const unsigned long *k = kbuf; | |
726 | while (count > 0 && !rc) { | |
727 | rc = __poke_user(target, pos, *k++); | |
728 | count -= sizeof(*k); | |
729 | pos += sizeof(*k); | |
730 | } | |
731 | } else { | |
732 | const unsigned long __user *u = ubuf; | |
733 | while (count > 0 && !rc) { | |
734 | unsigned long word; | |
735 | rc = __get_user(word, u++); | |
736 | if (rc) | |
737 | break; | |
738 | rc = __poke_user(target, pos, word); | |
739 | count -= sizeof(*u); | |
740 | pos += sizeof(*u); | |
741 | } | |
742 | } | |
743 | ||
744 | if (rc == 0 && target == current) | |
745 | restore_access_regs(target->thread.acrs); | |
746 | ||
747 | return rc; | |
748 | } | |
749 | ||
750 | static int s390_fpregs_get(struct task_struct *target, | |
751 | const struct user_regset *regset, unsigned int pos, | |
752 | unsigned int count, void *kbuf, void __user *ubuf) | |
753 | { | |
754 | if (target == current) | |
755 | save_fp_regs(&target->thread.fp_regs); | |
756 | ||
757 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
758 | &target->thread.fp_regs, 0, -1); | |
759 | } | |
760 | ||
761 | static int s390_fpregs_set(struct task_struct *target, | |
762 | const struct user_regset *regset, unsigned int pos, | |
763 | unsigned int count, const void *kbuf, | |
764 | const void __user *ubuf) | |
765 | { | |
766 | int rc = 0; | |
767 | ||
768 | if (target == current) | |
769 | save_fp_regs(&target->thread.fp_regs); | |
770 | ||
771 | /* If setting FPC, must validate it first. */ | |
772 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
773 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
774 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
775 | 0, offsetof(s390_fp_regs, fprs)); | |
776 | if (rc) | |
777 | return rc; | |
778 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
779 | return -EINVAL; | |
780 | target->thread.fp_regs.fpc = fpc[0]; | |
781 | } | |
782 | ||
783 | if (rc == 0 && count > 0) | |
784 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
785 | target->thread.fp_regs.fprs, | |
786 | offsetof(s390_fp_regs, fprs), -1); | |
787 | ||
788 | if (rc == 0 && target == current) | |
789 | restore_fp_regs(&target->thread.fp_regs); | |
790 | ||
791 | return rc; | |
792 | } | |
793 | ||
794 | static const struct user_regset s390_regsets[] = { | |
795 | [REGSET_GENERAL] = { | |
796 | .core_note_type = NT_PRSTATUS, | |
797 | .n = sizeof(s390_regs) / sizeof(long), | |
798 | .size = sizeof(long), | |
799 | .align = sizeof(long), | |
800 | .get = s390_regs_get, | |
801 | .set = s390_regs_set, | |
802 | }, | |
803 | [REGSET_FP] = { | |
804 | .core_note_type = NT_PRFPREG, | |
805 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
806 | .size = sizeof(long), | |
807 | .align = sizeof(long), | |
808 | .get = s390_fpregs_get, | |
809 | .set = s390_fpregs_set, | |
810 | }, | |
811 | }; | |
812 | ||
813 | static const struct user_regset_view user_s390_view = { | |
814 | .name = UTS_MACHINE, | |
815 | .e_machine = EM_S390, | |
816 | .regsets = s390_regsets, | |
817 | .n = ARRAY_SIZE(s390_regsets) | |
818 | }; | |
819 | ||
820 | #ifdef CONFIG_COMPAT | |
821 | static int s390_compat_regs_get(struct task_struct *target, | |
822 | const struct user_regset *regset, | |
823 | unsigned int pos, unsigned int count, | |
824 | void *kbuf, void __user *ubuf) | |
825 | { | |
826 | if (target == current) | |
827 | save_access_regs(target->thread.acrs); | |
828 | ||
829 | if (kbuf) { | |
830 | compat_ulong_t *k = kbuf; | |
831 | while (count > 0) { | |
832 | *k++ = __peek_user_compat(target, pos); | |
833 | count -= sizeof(*k); | |
834 | pos += sizeof(*k); | |
835 | } | |
836 | } else { | |
837 | compat_ulong_t __user *u = ubuf; | |
838 | while (count > 0) { | |
839 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
840 | return -EFAULT; | |
841 | count -= sizeof(*u); | |
842 | pos += sizeof(*u); | |
843 | } | |
844 | } | |
845 | return 0; | |
846 | } | |
847 | ||
848 | static int s390_compat_regs_set(struct task_struct *target, | |
849 | const struct user_regset *regset, | |
850 | unsigned int pos, unsigned int count, | |
851 | const void *kbuf, const void __user *ubuf) | |
852 | { | |
853 | int rc = 0; | |
854 | ||
855 | if (target == current) | |
856 | save_access_regs(target->thread.acrs); | |
857 | ||
858 | if (kbuf) { | |
859 | const compat_ulong_t *k = kbuf; | |
860 | while (count > 0 && !rc) { | |
861 | rc = __poke_user_compat(target, pos, *k++); | |
862 | count -= sizeof(*k); | |
863 | pos += sizeof(*k); | |
864 | } | |
865 | } else { | |
866 | const compat_ulong_t __user *u = ubuf; | |
867 | while (count > 0 && !rc) { | |
868 | compat_ulong_t word; | |
869 | rc = __get_user(word, u++); | |
870 | if (rc) | |
871 | break; | |
872 | rc = __poke_user_compat(target, pos, word); | |
873 | count -= sizeof(*u); | |
874 | pos += sizeof(*u); | |
875 | } | |
876 | } | |
877 | ||
878 | if (rc == 0 && target == current) | |
879 | restore_access_regs(target->thread.acrs); | |
880 | ||
881 | return rc; | |
882 | } | |
883 | ||
884 | static const struct user_regset s390_compat_regsets[] = { | |
885 | [REGSET_GENERAL] = { | |
886 | .core_note_type = NT_PRSTATUS, | |
887 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
888 | .size = sizeof(compat_long_t), | |
889 | .align = sizeof(compat_long_t), | |
890 | .get = s390_compat_regs_get, | |
891 | .set = s390_compat_regs_set, | |
892 | }, | |
893 | [REGSET_FP] = { | |
894 | .core_note_type = NT_PRFPREG, | |
895 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
896 | .size = sizeof(compat_long_t), | |
897 | .align = sizeof(compat_long_t), | |
898 | .get = s390_fpregs_get, | |
899 | .set = s390_fpregs_set, | |
900 | }, | |
901 | }; | |
902 | ||
903 | static const struct user_regset_view user_s390_compat_view = { | |
904 | .name = "s390", | |
905 | .e_machine = EM_S390, | |
906 | .regsets = s390_compat_regsets, | |
907 | .n = ARRAY_SIZE(s390_compat_regsets) | |
908 | }; | |
909 | #endif | |
910 | ||
911 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
912 | { | |
913 | #ifdef CONFIG_COMPAT | |
914 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
915 | return &user_s390_compat_view; | |
916 | #endif | |
917 | return &user_s390_view; | |
918 | } |