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> | |
1da177e4 LT |
29 | #include <linux/errno.h> |
30 | #include <linux/ptrace.h> | |
31 | #include <linux/user.h> | |
32 | #include <linux/security.h> | |
33 | #include <linux/audit.h> | |
7ed20e1a | 34 | #include <linux/signal.h> |
63506c41 MS |
35 | #include <linux/elf.h> |
36 | #include <linux/regset.h> | |
753c4dd6 | 37 | #include <linux/tracehook.h> |
bcf5cef7 | 38 | #include <linux/seccomp.h> |
9bf1226b | 39 | #include <trace/syscall.h> |
bcf5cef7 | 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 | ||
1c569f02 JS |
54 | #define CREATE_TRACE_POINTS |
55 | #include <trace/events/syscalls.h> | |
5e9ad7df | 56 | |
63506c41 MS |
57 | enum s390_regset { |
58 | REGSET_GENERAL, | |
59 | REGSET_FP, | |
60 | }; | |
61 | ||
1da177e4 LT |
62 | static void |
63 | FixPerRegisters(struct task_struct *task) | |
64 | { | |
65 | struct pt_regs *regs; | |
66 | per_struct *per_info; | |
67 | ||
c7584fb6 | 68 | regs = task_pt_regs(task); |
1da177e4 LT |
69 | per_info = (per_struct *) &task->thread.per_info; |
70 | per_info->control_regs.bits.em_instruction_fetch = | |
71 | per_info->single_step | per_info->instruction_fetch; | |
72 | ||
73 | if (per_info->single_step) { | |
74 | per_info->control_regs.bits.starting_addr = 0; | |
347a8dc3 | 75 | #ifdef CONFIG_COMPAT |
7757591a | 76 | if (is_compat_task()) |
1da177e4 LT |
77 | per_info->control_regs.bits.ending_addr = 0x7fffffffUL; |
78 | else | |
79 | #endif | |
80 | per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; | |
81 | } else { | |
82 | per_info->control_regs.bits.starting_addr = | |
83 | per_info->starting_addr; | |
84 | per_info->control_regs.bits.ending_addr = | |
85 | per_info->ending_addr; | |
86 | } | |
87 | /* | |
88 | * if any of the control reg tracing bits are on | |
89 | * we switch on per in the psw | |
90 | */ | |
91 | if (per_info->control_regs.words.cr[0] & PER_EM_MASK) | |
92 | regs->psw.mask |= PSW_MASK_PER; | |
93 | else | |
94 | regs->psw.mask &= ~PSW_MASK_PER; | |
95 | ||
96 | if (per_info->control_regs.bits.em_storage_alteration) | |
97 | per_info->control_regs.bits.storage_alt_space_ctl = 1; | |
98 | else | |
99 | per_info->control_regs.bits.storage_alt_space_ctl = 0; | |
100 | } | |
101 | ||
0ac30be4 | 102 | void user_enable_single_step(struct task_struct *task) |
1da177e4 LT |
103 | { |
104 | task->thread.per_info.single_step = 1; | |
105 | FixPerRegisters(task); | |
106 | } | |
107 | ||
0ac30be4 | 108 | void user_disable_single_step(struct task_struct *task) |
1da177e4 LT |
109 | { |
110 | task->thread.per_info.single_step = 0; | |
111 | FixPerRegisters(task); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Called by kernel/ptrace.c when detaching.. | |
116 | * | |
117 | * Make sure single step bits etc are not set. | |
118 | */ | |
119 | void | |
120 | ptrace_disable(struct task_struct *child) | |
121 | { | |
122 | /* make sure the single step bit is not set. */ | |
0ac30be4 | 123 | user_disable_single_step(child); |
1da177e4 LT |
124 | } |
125 | ||
347a8dc3 | 126 | #ifndef CONFIG_64BIT |
1da177e4 LT |
127 | # define __ADDR_MASK 3 |
128 | #else | |
129 | # define __ADDR_MASK 7 | |
130 | #endif | |
131 | ||
132 | /* | |
133 | * Read the word at offset addr from the user area of a process. The | |
134 | * trouble here is that the information is littered over different | |
135 | * locations. The process registers are found on the kernel stack, | |
136 | * the floating point stuff and the trace settings are stored in | |
137 | * the task structure. In addition the different structures in | |
138 | * struct user contain pad bytes that should be read as zeroes. | |
139 | * Lovely... | |
140 | */ | |
63506c41 | 141 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
142 | { |
143 | struct user *dummy = NULL; | |
63506c41 | 144 | addr_t offset, tmp; |
1da177e4 LT |
145 | |
146 | if (addr < (addr_t) &dummy->regs.acrs) { | |
147 | /* | |
148 | * psw and gprs are stored on the stack | |
149 | */ | |
c7584fb6 | 150 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 LT |
151 | if (addr == (addr_t) &dummy->regs.psw.mask) |
152 | /* Remove per bit from user psw. */ | |
153 | tmp &= ~PSW_MASK_PER; | |
154 | ||
155 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
156 | /* | |
157 | * access registers are stored in the thread structure | |
158 | */ | |
159 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 160 | #ifdef CONFIG_64BIT |
778959db MS |
161 | /* |
162 | * Very special case: old & broken 64 bit gdb reading | |
163 | * from acrs[15]. Result is a 64 bit value. Read the | |
164 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
165 | */ | |
166 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
167 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
168 | else | |
169 | #endif | |
1da177e4 LT |
170 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
171 | ||
172 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
173 | /* | |
174 | * orig_gpr2 is stored on the kernel stack | |
175 | */ | |
c7584fb6 | 176 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 177 | |
3d6e48f4 JW |
178 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
179 | /* | |
180 | * prevent reads of padding hole between | |
181 | * orig_gpr2 and fp_regs on s390. | |
182 | */ | |
183 | tmp = 0; | |
184 | ||
1da177e4 LT |
185 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
186 | /* | |
187 | * floating point regs. are stored in the thread structure | |
188 | */ | |
189 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
190 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
191 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
192 | tmp &= (unsigned long) FPC_VALID_MASK | |
193 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
194 | |
195 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
196 | /* | |
197 | * per_info is found in the thread structure | |
198 | */ | |
199 | offset = addr - (addr_t) &dummy->regs.per_info; | |
200 | tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); | |
201 | ||
202 | } else | |
203 | tmp = 0; | |
204 | ||
63506c41 | 205 | return tmp; |
1da177e4 LT |
206 | } |
207 | ||
1da177e4 | 208 | static int |
63506c41 | 209 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 210 | { |
63506c41 | 211 | addr_t tmp, mask; |
1da177e4 LT |
212 | |
213 | /* | |
214 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 215 | * an alignment of 4. Programmers from hell... |
1da177e4 | 216 | */ |
778959db | 217 | mask = __ADDR_MASK; |
347a8dc3 | 218 | #ifdef CONFIG_64BIT |
547e3cec MS |
219 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
220 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
221 | mask = 3; |
222 | #endif | |
223 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
224 | return -EIO; |
225 | ||
63506c41 MS |
226 | tmp = __peek_user(child, addr); |
227 | return put_user(tmp, (addr_t __user *) data); | |
228 | } | |
229 | ||
230 | /* | |
231 | * Write a word to the user area of a process at location addr. This | |
232 | * operation does have an additional problem compared to peek_user. | |
233 | * Stores to the program status word and on the floating point | |
234 | * control register needs to get checked for validity. | |
235 | */ | |
236 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
237 | { | |
238 | struct user *dummy = NULL; | |
239 | addr_t offset; | |
240 | ||
1da177e4 LT |
241 | if (addr < (addr_t) &dummy->regs.acrs) { |
242 | /* | |
243 | * psw and gprs are stored on the stack | |
244 | */ | |
245 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
347a8dc3 | 246 | #ifdef CONFIG_COMPAT |
c1821c2e | 247 | data != PSW_MASK_MERGE(psw_user32_bits, data) && |
1da177e4 | 248 | #endif |
c1821c2e | 249 | data != PSW_MASK_MERGE(psw_user_bits, data)) |
1da177e4 LT |
250 | /* Invalid psw mask. */ |
251 | return -EINVAL; | |
347a8dc3 | 252 | #ifndef CONFIG_64BIT |
1da177e4 LT |
253 | if (addr == (addr_t) &dummy->regs.psw.addr) |
254 | /* I'd like to reject addresses without the | |
255 | high order bit but older gdb's rely on it */ | |
256 | data |= PSW_ADDR_AMODE; | |
257 | #endif | |
c7584fb6 | 258 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
259 | |
260 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
261 | /* | |
262 | * access registers are stored in the thread structure | |
263 | */ | |
264 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 265 | #ifdef CONFIG_64BIT |
778959db MS |
266 | /* |
267 | * Very special case: old & broken 64 bit gdb writing | |
268 | * to acrs[15] with a 64 bit value. Ignore the lower | |
269 | * half of the value and write the upper 32 bit to | |
270 | * acrs[15]. Sick... | |
271 | */ | |
272 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
273 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
274 | else | |
275 | #endif | |
1da177e4 LT |
276 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
277 | ||
278 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
279 | /* | |
280 | * orig_gpr2 is stored on the kernel stack | |
281 | */ | |
c7584fb6 | 282 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 283 | |
3d6e48f4 JW |
284 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
285 | /* | |
286 | * prevent writes of padding hole between | |
287 | * orig_gpr2 and fp_regs on s390. | |
288 | */ | |
289 | return 0; | |
290 | ||
1da177e4 LT |
291 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
292 | /* | |
293 | * floating point regs. are stored in the thread structure | |
294 | */ | |
295 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
296 | (data & ~((unsigned long) FPC_VALID_MASK |
297 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
298 | return -EINVAL; |
299 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
300 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
301 | ||
302 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
303 | /* | |
304 | * per_info is found in the thread structure | |
305 | */ | |
306 | offset = addr - (addr_t) &dummy->regs.per_info; | |
307 | *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; | |
308 | ||
309 | } | |
310 | ||
311 | FixPerRegisters(child); | |
312 | return 0; | |
313 | } | |
314 | ||
63506c41 MS |
315 | static int |
316 | poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
317 | { | |
63506c41 MS |
318 | addr_t mask; |
319 | ||
320 | /* | |
321 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
322 | * an alignment of 4. Programmers from hell indeed... | |
323 | */ | |
324 | mask = __ADDR_MASK; | |
325 | #ifdef CONFIG_64BIT | |
547e3cec MS |
326 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
327 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
328 | mask = 3; |
329 | #endif | |
330 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
331 | return -EIO; | |
332 | ||
333 | return __poke_user(child, addr, data); | |
334 | } | |
335 | ||
b499d76b | 336 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 337 | { |
1da177e4 LT |
338 | ptrace_area parea; |
339 | int copied, ret; | |
340 | ||
341 | switch (request) { | |
342 | case PTRACE_PEEKTEXT: | |
343 | case PTRACE_PEEKDATA: | |
344 | /* Remove high order bit from address (only for 31 bit). */ | |
345 | addr &= PSW_ADDR_INSN; | |
346 | /* read word at location addr. */ | |
76647323 | 347 | return generic_ptrace_peekdata(child, addr, data); |
1da177e4 LT |
348 | |
349 | case PTRACE_PEEKUSR: | |
350 | /* read the word at location addr in the USER area. */ | |
351 | return peek_user(child, addr, data); | |
352 | ||
353 | case PTRACE_POKETEXT: | |
354 | case PTRACE_POKEDATA: | |
355 | /* Remove high order bit from address (only for 31 bit). */ | |
356 | addr &= PSW_ADDR_INSN; | |
357 | /* write the word at location addr. */ | |
f284ce72 | 358 | return generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
359 | |
360 | case PTRACE_POKEUSR: | |
361 | /* write the word at location addr in the USER area */ | |
362 | return poke_user(child, addr, data); | |
363 | ||
364 | case PTRACE_PEEKUSR_AREA: | |
365 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 366 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
367 | sizeof(parea))) |
368 | return -EFAULT; | |
369 | addr = parea.kernel_addr; | |
370 | data = parea.process_addr; | |
371 | copied = 0; | |
372 | while (copied < parea.len) { | |
373 | if (request == PTRACE_PEEKUSR_AREA) | |
374 | ret = peek_user(child, addr, data); | |
375 | else { | |
2b67fc46 HC |
376 | addr_t utmp; |
377 | if (get_user(utmp, | |
378 | (addr_t __force __user *) data)) | |
1da177e4 | 379 | return -EFAULT; |
2b67fc46 | 380 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
381 | } |
382 | if (ret) | |
383 | return ret; | |
384 | addr += sizeof(unsigned long); | |
385 | data += sizeof(unsigned long); | |
386 | copied += sizeof(unsigned long); | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | return ptrace_request(child, request, addr, data); | |
391 | } | |
392 | ||
347a8dc3 | 393 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
394 | /* |
395 | * Now the fun part starts... a 31 bit program running in the | |
396 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
397 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
398 | * to handle, the difference to the 64 bit versions of the requests | |
399 | * is that the access is done in multiples of 4 byte instead of | |
400 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
401 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
402 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
403 | * is a 31 bit program too, the content of struct user can be | |
404 | * emulated. A 31 bit program peeking into the struct user of | |
405 | * a 64 bit program is a no-no. | |
406 | */ | |
407 | ||
408 | /* | |
409 | * Same as peek_user but for a 31 bit program. | |
410 | */ | |
63506c41 | 411 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 LT |
412 | { |
413 | struct user32 *dummy32 = NULL; | |
414 | per_struct32 *dummy_per32 = NULL; | |
415 | addr_t offset; | |
416 | __u32 tmp; | |
417 | ||
1da177e4 LT |
418 | if (addr < (addr_t) &dummy32->regs.acrs) { |
419 | /* | |
420 | * psw and gprs are stored on the stack | |
421 | */ | |
422 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
423 | /* Fake a 31 bit psw mask. */ | |
c7584fb6 | 424 | tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); |
c1821c2e | 425 | tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); |
1da177e4 LT |
426 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
427 | /* Fake a 31 bit psw address. */ | |
c7584fb6 | 428 | tmp = (__u32) task_pt_regs(child)->psw.addr | |
1da177e4 LT |
429 | PSW32_ADDR_AMODE31; |
430 | } else { | |
431 | /* gpr 0-15 */ | |
c7584fb6 | 432 | tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + |
1da177e4 LT |
433 | addr*2 + 4); |
434 | } | |
435 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
436 | /* | |
437 | * access registers are stored in the thread structure | |
438 | */ | |
439 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
440 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
441 | ||
442 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
443 | /* | |
444 | * orig_gpr2 is stored on the kernel stack | |
445 | */ | |
c7584fb6 | 446 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 447 | |
3d6e48f4 JW |
448 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
449 | /* | |
450 | * prevent reads of padding hole between | |
451 | * orig_gpr2 and fp_regs on s390. | |
452 | */ | |
453 | tmp = 0; | |
454 | ||
1da177e4 LT |
455 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
456 | /* | |
457 | * floating point regs. are stored in the thread structure | |
458 | */ | |
459 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
460 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
461 | ||
462 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
463 | /* | |
464 | * per_info is found in the thread structure | |
465 | */ | |
466 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
467 | /* This is magic. See per_struct and per_struct32. */ | |
468 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
469 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
470 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
471 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
472 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
473 | offset = offset*2 + 4; | |
474 | else | |
475 | offset = offset*2; | |
476 | tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); | |
477 | ||
478 | } else | |
479 | tmp = 0; | |
480 | ||
63506c41 MS |
481 | return tmp; |
482 | } | |
483 | ||
484 | static int peek_user_compat(struct task_struct *child, | |
485 | addr_t addr, addr_t data) | |
486 | { | |
487 | __u32 tmp; | |
488 | ||
7757591a | 489 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
490 | return -EIO; |
491 | ||
492 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
493 | return put_user(tmp, (__u32 __user *) data); |
494 | } | |
495 | ||
496 | /* | |
497 | * Same as poke_user but for a 31 bit program. | |
498 | */ | |
63506c41 MS |
499 | static int __poke_user_compat(struct task_struct *child, |
500 | addr_t addr, addr_t data) | |
1da177e4 LT |
501 | { |
502 | struct user32 *dummy32 = NULL; | |
503 | per_struct32 *dummy_per32 = NULL; | |
63506c41 | 504 | __u32 tmp = (__u32) data; |
1da177e4 | 505 | addr_t offset; |
1da177e4 LT |
506 | |
507 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
508 | /* | |
509 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
510 | */ | |
511 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
512 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
c1821c2e | 513 | if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) |
1da177e4 LT |
514 | /* Invalid psw mask. */ |
515 | return -EINVAL; | |
c7584fb6 | 516 | task_pt_regs(child)->psw.mask = |
c1821c2e | 517 | PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); |
1da177e4 LT |
518 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
519 | /* Build a 64 bit psw address from 31 bit address. */ | |
c7584fb6 | 520 | task_pt_regs(child)->psw.addr = |
1da177e4 LT |
521 | (__u64) tmp & PSW32_ADDR_INSN; |
522 | } else { | |
523 | /* gpr 0-15 */ | |
c7584fb6 | 524 | *(__u32*)((addr_t) &task_pt_regs(child)->psw |
1da177e4 LT |
525 | + addr*2 + 4) = tmp; |
526 | } | |
527 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
528 | /* | |
529 | * access registers are stored in the thread structure | |
530 | */ | |
531 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
532 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
533 | ||
534 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
535 | /* | |
536 | * orig_gpr2 is stored on the kernel stack | |
537 | */ | |
c7584fb6 | 538 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 539 | |
3d6e48f4 JW |
540 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
541 | /* | |
542 | * prevent writess of padding hole between | |
543 | * orig_gpr2 and fp_regs on s390. | |
544 | */ | |
545 | return 0; | |
546 | ||
1da177e4 LT |
547 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
548 | /* | |
549 | * floating point regs. are stored in the thread structure | |
550 | */ | |
551 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
552 | (tmp & ~FPC_VALID_MASK) != 0) | |
553 | /* Invalid floating point control. */ | |
554 | return -EINVAL; | |
555 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
556 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
557 | ||
558 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
559 | /* | |
560 | * per_info is found in the thread structure. | |
561 | */ | |
562 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
563 | /* | |
564 | * This is magic. See per_struct and per_struct32. | |
565 | * By incident the offsets in per_struct are exactly | |
566 | * twice the offsets in per_struct32 for all fields. | |
567 | * The 8 byte fields need special handling though, | |
568 | * because the second half (bytes 4-7) is needed and | |
569 | * not the first half. | |
570 | */ | |
571 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
572 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
573 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
574 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
575 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
576 | offset = offset*2 + 4; | |
577 | else | |
578 | offset = offset*2; | |
579 | *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; | |
580 | ||
581 | } | |
582 | ||
583 | FixPerRegisters(child); | |
584 | return 0; | |
585 | } | |
586 | ||
63506c41 MS |
587 | static int poke_user_compat(struct task_struct *child, |
588 | addr_t addr, addr_t data) | |
589 | { | |
7757591a | 590 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) |
63506c41 MS |
591 | return -EIO; |
592 | ||
593 | return __poke_user_compat(child, addr, data); | |
594 | } | |
595 | ||
b499d76b RM |
596 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
597 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 598 | { |
b499d76b RM |
599 | unsigned long addr = caddr; |
600 | unsigned long data = cdata; | |
1da177e4 LT |
601 | ptrace_area_emu31 parea; |
602 | int copied, ret; | |
603 | ||
604 | switch (request) { | |
1da177e4 LT |
605 | case PTRACE_PEEKUSR: |
606 | /* read the word at location addr in the USER area. */ | |
63506c41 | 607 | return peek_user_compat(child, addr, data); |
1da177e4 | 608 | |
1da177e4 LT |
609 | case PTRACE_POKEUSR: |
610 | /* write the word at location addr in the USER area */ | |
63506c41 | 611 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
612 | |
613 | case PTRACE_PEEKUSR_AREA: | |
614 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 615 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
616 | sizeof(parea))) |
617 | return -EFAULT; | |
618 | addr = parea.kernel_addr; | |
619 | data = parea.process_addr; | |
620 | copied = 0; | |
621 | while (copied < parea.len) { | |
622 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 623 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 624 | else { |
2b67fc46 HC |
625 | __u32 utmp; |
626 | if (get_user(utmp, | |
627 | (__u32 __force __user *) data)) | |
1da177e4 | 628 | return -EFAULT; |
63506c41 | 629 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
630 | } |
631 | if (ret) | |
632 | return ret; | |
633 | addr += sizeof(unsigned int); | |
634 | data += sizeof(unsigned int); | |
635 | copied += sizeof(unsigned int); | |
636 | } | |
637 | return 0; | |
1da177e4 | 638 | } |
b499d76b | 639 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
640 | } |
641 | #endif | |
642 | ||
753c4dd6 | 643 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 644 | { |
753c4dd6 | 645 | long ret; |
1da177e4 | 646 | |
bcf5cef7 HC |
647 | /* Do the secure computing check first. */ |
648 | secure_computing(regs->gprs[2]); | |
649 | ||
c5c3a6d8 | 650 | /* |
753c4dd6 MS |
651 | * The sysc_tracesys code in entry.S stored the system |
652 | * call number to gprs[2]. | |
c5c3a6d8 | 653 | */ |
753c4dd6 MS |
654 | ret = regs->gprs[2]; |
655 | if (test_thread_flag(TIF_SYSCALL_TRACE) && | |
656 | (tracehook_report_syscall_entry(regs) || | |
657 | regs->gprs[2] >= NR_syscalls)) { | |
658 | /* | |
659 | * Tracing decided this syscall should not happen or the | |
660 | * debugger stored an invalid system call number. Skip | |
661 | * the system call and the system call restart handling. | |
662 | */ | |
59da2139 | 663 | regs->svcnr = 0; |
753c4dd6 | 664 | ret = -1; |
1da177e4 | 665 | } |
753c4dd6 | 666 | |
66700001 | 667 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 668 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 669 | |
753c4dd6 | 670 | if (unlikely(current->audit_context)) |
7757591a | 671 | audit_syscall_entry(is_compat_task() ? |
753c4dd6 MS |
672 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, |
673 | regs->gprs[2], regs->orig_gpr2, | |
674 | regs->gprs[3], regs->gprs[4], | |
675 | regs->gprs[5]); | |
676 | return ret; | |
677 | } | |
678 | ||
679 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
680 | { | |
681 | if (unlikely(current->audit_context)) | |
682 | audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), | |
683 | regs->gprs[2]); | |
684 | ||
66700001 | 685 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 686 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 687 | |
753c4dd6 MS |
688 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
689 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 690 | } |
63506c41 MS |
691 | |
692 | /* | |
693 | * user_regset definitions. | |
694 | */ | |
695 | ||
696 | static int s390_regs_get(struct task_struct *target, | |
697 | const struct user_regset *regset, | |
698 | unsigned int pos, unsigned int count, | |
699 | void *kbuf, void __user *ubuf) | |
700 | { | |
701 | if (target == current) | |
702 | save_access_regs(target->thread.acrs); | |
703 | ||
704 | if (kbuf) { | |
705 | unsigned long *k = kbuf; | |
706 | while (count > 0) { | |
707 | *k++ = __peek_user(target, pos); | |
708 | count -= sizeof(*k); | |
709 | pos += sizeof(*k); | |
710 | } | |
711 | } else { | |
712 | unsigned long __user *u = ubuf; | |
713 | while (count > 0) { | |
714 | if (__put_user(__peek_user(target, pos), u++)) | |
715 | return -EFAULT; | |
716 | count -= sizeof(*u); | |
717 | pos += sizeof(*u); | |
718 | } | |
719 | } | |
720 | return 0; | |
721 | } | |
722 | ||
723 | static int s390_regs_set(struct task_struct *target, | |
724 | const struct user_regset *regset, | |
725 | unsigned int pos, unsigned int count, | |
726 | const void *kbuf, const void __user *ubuf) | |
727 | { | |
728 | int rc = 0; | |
729 | ||
730 | if (target == current) | |
731 | save_access_regs(target->thread.acrs); | |
732 | ||
733 | if (kbuf) { | |
734 | const unsigned long *k = kbuf; | |
735 | while (count > 0 && !rc) { | |
736 | rc = __poke_user(target, pos, *k++); | |
737 | count -= sizeof(*k); | |
738 | pos += sizeof(*k); | |
739 | } | |
740 | } else { | |
741 | const unsigned long __user *u = ubuf; | |
742 | while (count > 0 && !rc) { | |
743 | unsigned long word; | |
744 | rc = __get_user(word, u++); | |
745 | if (rc) | |
746 | break; | |
747 | rc = __poke_user(target, pos, word); | |
748 | count -= sizeof(*u); | |
749 | pos += sizeof(*u); | |
750 | } | |
751 | } | |
752 | ||
753 | if (rc == 0 && target == current) | |
754 | restore_access_regs(target->thread.acrs); | |
755 | ||
756 | return rc; | |
757 | } | |
758 | ||
759 | static int s390_fpregs_get(struct task_struct *target, | |
760 | const struct user_regset *regset, unsigned int pos, | |
761 | unsigned int count, void *kbuf, void __user *ubuf) | |
762 | { | |
763 | if (target == current) | |
764 | save_fp_regs(&target->thread.fp_regs); | |
765 | ||
766 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
767 | &target->thread.fp_regs, 0, -1); | |
768 | } | |
769 | ||
770 | static int s390_fpregs_set(struct task_struct *target, | |
771 | const struct user_regset *regset, unsigned int pos, | |
772 | unsigned int count, const void *kbuf, | |
773 | const void __user *ubuf) | |
774 | { | |
775 | int rc = 0; | |
776 | ||
777 | if (target == current) | |
778 | save_fp_regs(&target->thread.fp_regs); | |
779 | ||
780 | /* If setting FPC, must validate it first. */ | |
781 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
782 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
783 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
784 | 0, offsetof(s390_fp_regs, fprs)); | |
785 | if (rc) | |
786 | return rc; | |
787 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
788 | return -EINVAL; | |
789 | target->thread.fp_regs.fpc = fpc[0]; | |
790 | } | |
791 | ||
792 | if (rc == 0 && count > 0) | |
793 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
794 | target->thread.fp_regs.fprs, | |
795 | offsetof(s390_fp_regs, fprs), -1); | |
796 | ||
797 | if (rc == 0 && target == current) | |
798 | restore_fp_regs(&target->thread.fp_regs); | |
799 | ||
800 | return rc; | |
801 | } | |
802 | ||
803 | static const struct user_regset s390_regsets[] = { | |
804 | [REGSET_GENERAL] = { | |
805 | .core_note_type = NT_PRSTATUS, | |
806 | .n = sizeof(s390_regs) / sizeof(long), | |
807 | .size = sizeof(long), | |
808 | .align = sizeof(long), | |
809 | .get = s390_regs_get, | |
810 | .set = s390_regs_set, | |
811 | }, | |
812 | [REGSET_FP] = { | |
813 | .core_note_type = NT_PRFPREG, | |
814 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
815 | .size = sizeof(long), | |
816 | .align = sizeof(long), | |
817 | .get = s390_fpregs_get, | |
818 | .set = s390_fpregs_set, | |
819 | }, | |
820 | }; | |
821 | ||
822 | static const struct user_regset_view user_s390_view = { | |
823 | .name = UTS_MACHINE, | |
824 | .e_machine = EM_S390, | |
825 | .regsets = s390_regsets, | |
826 | .n = ARRAY_SIZE(s390_regsets) | |
827 | }; | |
828 | ||
829 | #ifdef CONFIG_COMPAT | |
830 | static int s390_compat_regs_get(struct task_struct *target, | |
831 | const struct user_regset *regset, | |
832 | unsigned int pos, unsigned int count, | |
833 | void *kbuf, void __user *ubuf) | |
834 | { | |
835 | if (target == current) | |
836 | save_access_regs(target->thread.acrs); | |
837 | ||
838 | if (kbuf) { | |
839 | compat_ulong_t *k = kbuf; | |
840 | while (count > 0) { | |
841 | *k++ = __peek_user_compat(target, pos); | |
842 | count -= sizeof(*k); | |
843 | pos += sizeof(*k); | |
844 | } | |
845 | } else { | |
846 | compat_ulong_t __user *u = ubuf; | |
847 | while (count > 0) { | |
848 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
849 | return -EFAULT; | |
850 | count -= sizeof(*u); | |
851 | pos += sizeof(*u); | |
852 | } | |
853 | } | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static int s390_compat_regs_set(struct task_struct *target, | |
858 | const struct user_regset *regset, | |
859 | unsigned int pos, unsigned int count, | |
860 | const void *kbuf, const void __user *ubuf) | |
861 | { | |
862 | int rc = 0; | |
863 | ||
864 | if (target == current) | |
865 | save_access_regs(target->thread.acrs); | |
866 | ||
867 | if (kbuf) { | |
868 | const compat_ulong_t *k = kbuf; | |
869 | while (count > 0 && !rc) { | |
870 | rc = __poke_user_compat(target, pos, *k++); | |
871 | count -= sizeof(*k); | |
872 | pos += sizeof(*k); | |
873 | } | |
874 | } else { | |
875 | const compat_ulong_t __user *u = ubuf; | |
876 | while (count > 0 && !rc) { | |
877 | compat_ulong_t word; | |
878 | rc = __get_user(word, u++); | |
879 | if (rc) | |
880 | break; | |
881 | rc = __poke_user_compat(target, pos, word); | |
882 | count -= sizeof(*u); | |
883 | pos += sizeof(*u); | |
884 | } | |
885 | } | |
886 | ||
887 | if (rc == 0 && target == current) | |
888 | restore_access_regs(target->thread.acrs); | |
889 | ||
890 | return rc; | |
891 | } | |
892 | ||
893 | static const struct user_regset s390_compat_regsets[] = { | |
894 | [REGSET_GENERAL] = { | |
895 | .core_note_type = NT_PRSTATUS, | |
896 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
897 | .size = sizeof(compat_long_t), | |
898 | .align = sizeof(compat_long_t), | |
899 | .get = s390_compat_regs_get, | |
900 | .set = s390_compat_regs_set, | |
901 | }, | |
902 | [REGSET_FP] = { | |
903 | .core_note_type = NT_PRFPREG, | |
904 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
905 | .size = sizeof(compat_long_t), | |
906 | .align = sizeof(compat_long_t), | |
907 | .get = s390_fpregs_get, | |
908 | .set = s390_fpregs_set, | |
909 | }, | |
910 | }; | |
911 | ||
912 | static const struct user_regset_view user_s390_compat_view = { | |
913 | .name = "s390", | |
914 | .e_machine = EM_S390, | |
915 | .regsets = s390_compat_regsets, | |
916 | .n = ARRAY_SIZE(s390_compat_regsets) | |
917 | }; | |
918 | #endif | |
919 | ||
920 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
921 | { | |
922 | #ifdef CONFIG_COMPAT | |
923 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
924 | return &user_s390_compat_view; | |
925 | #endif | |
926 | return &user_s390_view; | |
927 | } |