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