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, | |
ea2a4d3a | 60 | REGSET_GENERAL_EXTENDED, |
63506c41 MS |
61 | }; |
62 | ||
1da177e4 LT |
63 | static void |
64 | FixPerRegisters(struct task_struct *task) | |
65 | { | |
66 | struct pt_regs *regs; | |
67 | per_struct *per_info; | |
68 | ||
c7584fb6 | 69 | regs = task_pt_regs(task); |
1da177e4 LT |
70 | per_info = (per_struct *) &task->thread.per_info; |
71 | per_info->control_regs.bits.em_instruction_fetch = | |
72 | per_info->single_step | per_info->instruction_fetch; | |
73 | ||
74 | if (per_info->single_step) { | |
75 | per_info->control_regs.bits.starting_addr = 0; | |
347a8dc3 | 76 | #ifdef CONFIG_COMPAT |
7757591a | 77 | if (is_compat_task()) |
1da177e4 LT |
78 | per_info->control_regs.bits.ending_addr = 0x7fffffffUL; |
79 | else | |
80 | #endif | |
81 | per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; | |
82 | } else { | |
83 | per_info->control_regs.bits.starting_addr = | |
84 | per_info->starting_addr; | |
85 | per_info->control_regs.bits.ending_addr = | |
86 | per_info->ending_addr; | |
87 | } | |
88 | /* | |
89 | * if any of the control reg tracing bits are on | |
90 | * we switch on per in the psw | |
91 | */ | |
92 | if (per_info->control_regs.words.cr[0] & PER_EM_MASK) | |
93 | regs->psw.mask |= PSW_MASK_PER; | |
94 | else | |
95 | regs->psw.mask &= ~PSW_MASK_PER; | |
96 | ||
97 | if (per_info->control_regs.bits.em_storage_alteration) | |
98 | per_info->control_regs.bits.storage_alt_space_ctl = 1; | |
99 | else | |
100 | per_info->control_regs.bits.storage_alt_space_ctl = 0; | |
101 | } | |
102 | ||
0ac30be4 | 103 | void user_enable_single_step(struct task_struct *task) |
1da177e4 LT |
104 | { |
105 | task->thread.per_info.single_step = 1; | |
106 | FixPerRegisters(task); | |
107 | } | |
108 | ||
0ac30be4 | 109 | void user_disable_single_step(struct task_struct *task) |
1da177e4 LT |
110 | { |
111 | task->thread.per_info.single_step = 0; | |
112 | FixPerRegisters(task); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Called by kernel/ptrace.c when detaching.. | |
117 | * | |
118 | * Make sure single step bits etc are not set. | |
119 | */ | |
120 | void | |
121 | ptrace_disable(struct task_struct *child) | |
122 | { | |
123 | /* make sure the single step bit is not set. */ | |
0ac30be4 | 124 | user_disable_single_step(child); |
1da177e4 LT |
125 | } |
126 | ||
347a8dc3 | 127 | #ifndef CONFIG_64BIT |
1da177e4 LT |
128 | # define __ADDR_MASK 3 |
129 | #else | |
130 | # define __ADDR_MASK 7 | |
131 | #endif | |
132 | ||
133 | /* | |
134 | * Read the word at offset addr from the user area of a process. The | |
135 | * trouble here is that the information is littered over different | |
136 | * locations. The process registers are found on the kernel stack, | |
137 | * the floating point stuff and the trace settings are stored in | |
138 | * the task structure. In addition the different structures in | |
139 | * struct user contain pad bytes that should be read as zeroes. | |
140 | * Lovely... | |
141 | */ | |
63506c41 | 142 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
143 | { |
144 | struct user *dummy = NULL; | |
63506c41 | 145 | addr_t offset, tmp; |
1da177e4 LT |
146 | |
147 | if (addr < (addr_t) &dummy->regs.acrs) { | |
148 | /* | |
149 | * psw and gprs are stored on the stack | |
150 | */ | |
c7584fb6 | 151 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 LT |
152 | if (addr == (addr_t) &dummy->regs.psw.mask) |
153 | /* Remove per bit from user psw. */ | |
154 | tmp &= ~PSW_MASK_PER; | |
155 | ||
156 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
157 | /* | |
158 | * access registers are stored in the thread structure | |
159 | */ | |
160 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 161 | #ifdef CONFIG_64BIT |
778959db MS |
162 | /* |
163 | * Very special case: old & broken 64 bit gdb reading | |
164 | * from acrs[15]. Result is a 64 bit value. Read the | |
165 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
166 | */ | |
167 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
168 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
169 | else | |
170 | #endif | |
1da177e4 LT |
171 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
172 | ||
173 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
174 | /* | |
175 | * orig_gpr2 is stored on the kernel stack | |
176 | */ | |
c7584fb6 | 177 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 178 | |
3d6e48f4 JW |
179 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
180 | /* | |
181 | * prevent reads of padding hole between | |
182 | * orig_gpr2 and fp_regs on s390. | |
183 | */ | |
184 | tmp = 0; | |
185 | ||
1da177e4 LT |
186 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
187 | /* | |
188 | * floating point regs. are stored in the thread structure | |
189 | */ | |
190 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
191 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
192 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
193 | tmp &= (unsigned long) FPC_VALID_MASK | |
194 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
195 | |
196 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
197 | /* | |
198 | * per_info is found in the thread structure | |
199 | */ | |
200 | offset = addr - (addr_t) &dummy->regs.per_info; | |
201 | tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); | |
202 | ||
203 | } else | |
204 | tmp = 0; | |
205 | ||
63506c41 | 206 | return tmp; |
1da177e4 LT |
207 | } |
208 | ||
1da177e4 | 209 | static int |
63506c41 | 210 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 211 | { |
63506c41 | 212 | addr_t tmp, mask; |
1da177e4 LT |
213 | |
214 | /* | |
215 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 216 | * an alignment of 4. Programmers from hell... |
1da177e4 | 217 | */ |
778959db | 218 | mask = __ADDR_MASK; |
347a8dc3 | 219 | #ifdef CONFIG_64BIT |
547e3cec MS |
220 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
221 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
222 | mask = 3; |
223 | #endif | |
224 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
225 | return -EIO; |
226 | ||
63506c41 MS |
227 | tmp = __peek_user(child, addr); |
228 | return put_user(tmp, (addr_t __user *) data); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Write a word to the user area of a process at location addr. This | |
233 | * operation does have an additional problem compared to peek_user. | |
234 | * Stores to the program status word and on the floating point | |
235 | * control register needs to get checked for validity. | |
236 | */ | |
237 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
238 | { | |
239 | struct user *dummy = NULL; | |
240 | addr_t offset; | |
241 | ||
1da177e4 LT |
242 | if (addr < (addr_t) &dummy->regs.acrs) { |
243 | /* | |
244 | * psw and gprs are stored on the stack | |
245 | */ | |
246 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
347a8dc3 | 247 | #ifdef CONFIG_COMPAT |
c1821c2e | 248 | data != PSW_MASK_MERGE(psw_user32_bits, data) && |
1da177e4 | 249 | #endif |
c1821c2e | 250 | data != PSW_MASK_MERGE(psw_user_bits, data)) |
1da177e4 LT |
251 | /* Invalid psw mask. */ |
252 | return -EINVAL; | |
347a8dc3 | 253 | #ifndef CONFIG_64BIT |
1da177e4 LT |
254 | if (addr == (addr_t) &dummy->regs.psw.addr) |
255 | /* I'd like to reject addresses without the | |
256 | high order bit but older gdb's rely on it */ | |
257 | data |= PSW_ADDR_AMODE; | |
258 | #endif | |
c7584fb6 | 259 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
260 | |
261 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
262 | /* | |
263 | * access registers are stored in the thread structure | |
264 | */ | |
265 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 266 | #ifdef CONFIG_64BIT |
778959db MS |
267 | /* |
268 | * Very special case: old & broken 64 bit gdb writing | |
269 | * to acrs[15] with a 64 bit value. Ignore the lower | |
270 | * half of the value and write the upper 32 bit to | |
271 | * acrs[15]. Sick... | |
272 | */ | |
273 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
274 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
275 | else | |
276 | #endif | |
1da177e4 LT |
277 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
278 | ||
279 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
280 | /* | |
281 | * orig_gpr2 is stored on the kernel stack | |
282 | */ | |
c7584fb6 | 283 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 284 | |
3d6e48f4 JW |
285 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
286 | /* | |
287 | * prevent writes of padding hole between | |
288 | * orig_gpr2 and fp_regs on s390. | |
289 | */ | |
290 | return 0; | |
291 | ||
1da177e4 LT |
292 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
293 | /* | |
294 | * floating point regs. are stored in the thread structure | |
295 | */ | |
296 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
297 | (data & ~((unsigned long) FPC_VALID_MASK |
298 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
299 | return -EINVAL; |
300 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
301 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
302 | ||
303 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
304 | /* | |
305 | * per_info is found in the thread structure | |
306 | */ | |
307 | offset = addr - (addr_t) &dummy->regs.per_info; | |
308 | *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; | |
309 | ||
310 | } | |
311 | ||
312 | FixPerRegisters(child); | |
313 | return 0; | |
314 | } | |
315 | ||
63506c41 MS |
316 | static int |
317 | poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
318 | { | |
63506c41 MS |
319 | addr_t mask; |
320 | ||
321 | /* | |
322 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
323 | * an alignment of 4. Programmers from hell indeed... | |
324 | */ | |
325 | mask = __ADDR_MASK; | |
326 | #ifdef CONFIG_64BIT | |
547e3cec MS |
327 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
328 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
329 | mask = 3; |
330 | #endif | |
331 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
332 | return -EIO; | |
333 | ||
334 | return __poke_user(child, addr, data); | |
335 | } | |
336 | ||
b499d76b | 337 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 338 | { |
1da177e4 LT |
339 | ptrace_area parea; |
340 | int copied, ret; | |
341 | ||
342 | switch (request) { | |
1da177e4 LT |
343 | case PTRACE_PEEKUSR: |
344 | /* read the word at location addr in the USER area. */ | |
345 | return peek_user(child, addr, data); | |
346 | ||
1da177e4 LT |
347 | case PTRACE_POKEUSR: |
348 | /* write the word at location addr in the USER area */ | |
349 | return poke_user(child, addr, data); | |
350 | ||
351 | case PTRACE_PEEKUSR_AREA: | |
352 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 353 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
354 | sizeof(parea))) |
355 | return -EFAULT; | |
356 | addr = parea.kernel_addr; | |
357 | data = parea.process_addr; | |
358 | copied = 0; | |
359 | while (copied < parea.len) { | |
360 | if (request == PTRACE_PEEKUSR_AREA) | |
361 | ret = peek_user(child, addr, data); | |
362 | else { | |
2b67fc46 HC |
363 | addr_t utmp; |
364 | if (get_user(utmp, | |
365 | (addr_t __force __user *) data)) | |
1da177e4 | 366 | return -EFAULT; |
2b67fc46 | 367 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
368 | } |
369 | if (ret) | |
370 | return ret; | |
371 | addr += sizeof(unsigned long); | |
372 | data += sizeof(unsigned long); | |
373 | copied += sizeof(unsigned long); | |
374 | } | |
375 | return 0; | |
07805ac8 CB |
376 | default: |
377 | /* Removing high order bit from addr (only for 31 bit). */ | |
378 | addr &= PSW_ADDR_INSN; | |
379 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 380 | } |
1da177e4 LT |
381 | } |
382 | ||
347a8dc3 | 383 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
384 | /* |
385 | * Now the fun part starts... a 31 bit program running in the | |
386 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
387 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
388 | * to handle, the difference to the 64 bit versions of the requests | |
389 | * is that the access is done in multiples of 4 byte instead of | |
390 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
391 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
392 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
393 | * is a 31 bit program too, the content of struct user can be | |
394 | * emulated. A 31 bit program peeking into the struct user of | |
395 | * a 64 bit program is a no-no. | |
396 | */ | |
397 | ||
398 | /* | |
399 | * Same as peek_user but for a 31 bit program. | |
400 | */ | |
63506c41 | 401 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 LT |
402 | { |
403 | struct user32 *dummy32 = NULL; | |
404 | per_struct32 *dummy_per32 = NULL; | |
405 | addr_t offset; | |
406 | __u32 tmp; | |
407 | ||
1da177e4 LT |
408 | if (addr < (addr_t) &dummy32->regs.acrs) { |
409 | /* | |
410 | * psw and gprs are stored on the stack | |
411 | */ | |
412 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
413 | /* Fake a 31 bit psw mask. */ | |
c7584fb6 | 414 | tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); |
c1821c2e | 415 | tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); |
1da177e4 LT |
416 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
417 | /* Fake a 31 bit psw address. */ | |
c7584fb6 | 418 | tmp = (__u32) task_pt_regs(child)->psw.addr | |
1da177e4 LT |
419 | PSW32_ADDR_AMODE31; |
420 | } else { | |
421 | /* gpr 0-15 */ | |
c7584fb6 | 422 | tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + |
1da177e4 LT |
423 | addr*2 + 4); |
424 | } | |
425 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
426 | /* | |
427 | * access registers are stored in the thread structure | |
428 | */ | |
429 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
430 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
431 | ||
432 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
433 | /* | |
434 | * orig_gpr2 is stored on the kernel stack | |
435 | */ | |
c7584fb6 | 436 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 437 | |
3d6e48f4 JW |
438 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
439 | /* | |
440 | * prevent reads of padding hole between | |
441 | * orig_gpr2 and fp_regs on s390. | |
442 | */ | |
443 | tmp = 0; | |
444 | ||
1da177e4 LT |
445 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
446 | /* | |
447 | * floating point regs. are stored in the thread structure | |
448 | */ | |
449 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
450 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
451 | ||
452 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
453 | /* | |
454 | * per_info is found in the thread structure | |
455 | */ | |
456 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
457 | /* This is magic. See per_struct and per_struct32. */ | |
458 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
459 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
460 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
461 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
462 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
463 | offset = offset*2 + 4; | |
464 | else | |
465 | offset = offset*2; | |
466 | tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); | |
467 | ||
468 | } else | |
469 | tmp = 0; | |
470 | ||
63506c41 MS |
471 | return tmp; |
472 | } | |
473 | ||
474 | static int peek_user_compat(struct task_struct *child, | |
475 | addr_t addr, addr_t data) | |
476 | { | |
477 | __u32 tmp; | |
478 | ||
7757591a | 479 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
480 | return -EIO; |
481 | ||
482 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
483 | return put_user(tmp, (__u32 __user *) data); |
484 | } | |
485 | ||
486 | /* | |
487 | * Same as poke_user but for a 31 bit program. | |
488 | */ | |
63506c41 MS |
489 | static int __poke_user_compat(struct task_struct *child, |
490 | addr_t addr, addr_t data) | |
1da177e4 LT |
491 | { |
492 | struct user32 *dummy32 = NULL; | |
493 | per_struct32 *dummy_per32 = NULL; | |
63506c41 | 494 | __u32 tmp = (__u32) data; |
1da177e4 | 495 | addr_t offset; |
1da177e4 LT |
496 | |
497 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
498 | /* | |
499 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
500 | */ | |
501 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
502 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
c1821c2e | 503 | if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) |
1da177e4 LT |
504 | /* Invalid psw mask. */ |
505 | return -EINVAL; | |
c7584fb6 | 506 | task_pt_regs(child)->psw.mask = |
c1821c2e | 507 | PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); |
1da177e4 LT |
508 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
509 | /* Build a 64 bit psw address from 31 bit address. */ | |
c7584fb6 | 510 | task_pt_regs(child)->psw.addr = |
1da177e4 LT |
511 | (__u64) tmp & PSW32_ADDR_INSN; |
512 | } else { | |
513 | /* gpr 0-15 */ | |
c7584fb6 | 514 | *(__u32*)((addr_t) &task_pt_regs(child)->psw |
1da177e4 LT |
515 | + addr*2 + 4) = tmp; |
516 | } | |
517 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
518 | /* | |
519 | * access registers are stored in the thread structure | |
520 | */ | |
521 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
522 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
523 | ||
524 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
525 | /* | |
526 | * orig_gpr2 is stored on the kernel stack | |
527 | */ | |
c7584fb6 | 528 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 529 | |
3d6e48f4 JW |
530 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
531 | /* | |
532 | * prevent writess of padding hole between | |
533 | * orig_gpr2 and fp_regs on s390. | |
534 | */ | |
535 | return 0; | |
536 | ||
1da177e4 LT |
537 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
538 | /* | |
539 | * floating point regs. are stored in the thread structure | |
540 | */ | |
541 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
542 | (tmp & ~FPC_VALID_MASK) != 0) | |
543 | /* Invalid floating point control. */ | |
544 | return -EINVAL; | |
545 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
546 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
547 | ||
548 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
549 | /* | |
550 | * per_info is found in the thread structure. | |
551 | */ | |
552 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
553 | /* | |
554 | * This is magic. See per_struct and per_struct32. | |
555 | * By incident the offsets in per_struct are exactly | |
556 | * twice the offsets in per_struct32 for all fields. | |
557 | * The 8 byte fields need special handling though, | |
558 | * because the second half (bytes 4-7) is needed and | |
559 | * not the first half. | |
560 | */ | |
561 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
562 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
563 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
564 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
565 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
566 | offset = offset*2 + 4; | |
567 | else | |
568 | offset = offset*2; | |
569 | *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; | |
570 | ||
571 | } | |
572 | ||
573 | FixPerRegisters(child); | |
574 | return 0; | |
575 | } | |
576 | ||
63506c41 MS |
577 | static int poke_user_compat(struct task_struct *child, |
578 | addr_t addr, addr_t data) | |
579 | { | |
7757591a | 580 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) |
63506c41 MS |
581 | return -EIO; |
582 | ||
583 | return __poke_user_compat(child, addr, data); | |
584 | } | |
585 | ||
b499d76b RM |
586 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
587 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 588 | { |
b499d76b RM |
589 | unsigned long addr = caddr; |
590 | unsigned long data = cdata; | |
1da177e4 LT |
591 | ptrace_area_emu31 parea; |
592 | int copied, ret; | |
593 | ||
594 | switch (request) { | |
1da177e4 LT |
595 | case PTRACE_PEEKUSR: |
596 | /* read the word at location addr in the USER area. */ | |
63506c41 | 597 | return peek_user_compat(child, addr, data); |
1da177e4 | 598 | |
1da177e4 LT |
599 | case PTRACE_POKEUSR: |
600 | /* write the word at location addr in the USER area */ | |
63506c41 | 601 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
602 | |
603 | case PTRACE_PEEKUSR_AREA: | |
604 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 605 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
606 | sizeof(parea))) |
607 | return -EFAULT; | |
608 | addr = parea.kernel_addr; | |
609 | data = parea.process_addr; | |
610 | copied = 0; | |
611 | while (copied < parea.len) { | |
612 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 613 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 614 | else { |
2b67fc46 HC |
615 | __u32 utmp; |
616 | if (get_user(utmp, | |
617 | (__u32 __force __user *) data)) | |
1da177e4 | 618 | return -EFAULT; |
63506c41 | 619 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
620 | } |
621 | if (ret) | |
622 | return ret; | |
623 | addr += sizeof(unsigned int); | |
624 | data += sizeof(unsigned int); | |
625 | copied += sizeof(unsigned int); | |
626 | } | |
627 | return 0; | |
1da177e4 | 628 | } |
b499d76b | 629 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
630 | } |
631 | #endif | |
632 | ||
753c4dd6 | 633 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 634 | { |
753c4dd6 | 635 | long ret; |
1da177e4 | 636 | |
bcf5cef7 HC |
637 | /* Do the secure computing check first. */ |
638 | secure_computing(regs->gprs[2]); | |
639 | ||
c5c3a6d8 | 640 | /* |
753c4dd6 MS |
641 | * The sysc_tracesys code in entry.S stored the system |
642 | * call number to gprs[2]. | |
c5c3a6d8 | 643 | */ |
753c4dd6 MS |
644 | ret = regs->gprs[2]; |
645 | if (test_thread_flag(TIF_SYSCALL_TRACE) && | |
646 | (tracehook_report_syscall_entry(regs) || | |
647 | regs->gprs[2] >= NR_syscalls)) { | |
648 | /* | |
649 | * Tracing decided this syscall should not happen or the | |
650 | * debugger stored an invalid system call number. Skip | |
651 | * the system call and the system call restart handling. | |
652 | */ | |
59da2139 | 653 | regs->svcnr = 0; |
753c4dd6 | 654 | ret = -1; |
1da177e4 | 655 | } |
753c4dd6 | 656 | |
66700001 | 657 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 658 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 659 | |
753c4dd6 | 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 | ||
66700001 | 675 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 676 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 677 | |
753c4dd6 MS |
678 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
679 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 680 | } |
63506c41 MS |
681 | |
682 | /* | |
683 | * user_regset definitions. | |
684 | */ | |
685 | ||
686 | static int s390_regs_get(struct task_struct *target, | |
687 | const struct user_regset *regset, | |
688 | unsigned int pos, unsigned int count, | |
689 | void *kbuf, void __user *ubuf) | |
690 | { | |
691 | if (target == current) | |
692 | save_access_regs(target->thread.acrs); | |
693 | ||
694 | if (kbuf) { | |
695 | unsigned long *k = kbuf; | |
696 | while (count > 0) { | |
697 | *k++ = __peek_user(target, pos); | |
698 | count -= sizeof(*k); | |
699 | pos += sizeof(*k); | |
700 | } | |
701 | } else { | |
702 | unsigned long __user *u = ubuf; | |
703 | while (count > 0) { | |
704 | if (__put_user(__peek_user(target, pos), u++)) | |
705 | return -EFAULT; | |
706 | count -= sizeof(*u); | |
707 | pos += sizeof(*u); | |
708 | } | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | ||
713 | static int s390_regs_set(struct task_struct *target, | |
714 | const struct user_regset *regset, | |
715 | unsigned int pos, unsigned int count, | |
716 | const void *kbuf, const void __user *ubuf) | |
717 | { | |
718 | int rc = 0; | |
719 | ||
720 | if (target == current) | |
721 | save_access_regs(target->thread.acrs); | |
722 | ||
723 | if (kbuf) { | |
724 | const unsigned long *k = kbuf; | |
725 | while (count > 0 && !rc) { | |
726 | rc = __poke_user(target, pos, *k++); | |
727 | count -= sizeof(*k); | |
728 | pos += sizeof(*k); | |
729 | } | |
730 | } else { | |
731 | const unsigned long __user *u = ubuf; | |
732 | while (count > 0 && !rc) { | |
733 | unsigned long word; | |
734 | rc = __get_user(word, u++); | |
735 | if (rc) | |
736 | break; | |
737 | rc = __poke_user(target, pos, word); | |
738 | count -= sizeof(*u); | |
739 | pos += sizeof(*u); | |
740 | } | |
741 | } | |
742 | ||
743 | if (rc == 0 && target == current) | |
744 | restore_access_regs(target->thread.acrs); | |
745 | ||
746 | return rc; | |
747 | } | |
748 | ||
749 | static int s390_fpregs_get(struct task_struct *target, | |
750 | const struct user_regset *regset, unsigned int pos, | |
751 | unsigned int count, void *kbuf, void __user *ubuf) | |
752 | { | |
753 | if (target == current) | |
754 | save_fp_regs(&target->thread.fp_regs); | |
755 | ||
756 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
757 | &target->thread.fp_regs, 0, -1); | |
758 | } | |
759 | ||
760 | static int s390_fpregs_set(struct task_struct *target, | |
761 | const struct user_regset *regset, unsigned int pos, | |
762 | unsigned int count, const void *kbuf, | |
763 | const void __user *ubuf) | |
764 | { | |
765 | int rc = 0; | |
766 | ||
767 | if (target == current) | |
768 | save_fp_regs(&target->thread.fp_regs); | |
769 | ||
770 | /* If setting FPC, must validate it first. */ | |
771 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
772 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
773 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
774 | 0, offsetof(s390_fp_regs, fprs)); | |
775 | if (rc) | |
776 | return rc; | |
777 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
778 | return -EINVAL; | |
779 | target->thread.fp_regs.fpc = fpc[0]; | |
780 | } | |
781 | ||
782 | if (rc == 0 && count > 0) | |
783 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
784 | target->thread.fp_regs.fprs, | |
785 | offsetof(s390_fp_regs, fprs), -1); | |
786 | ||
787 | if (rc == 0 && target == current) | |
788 | restore_fp_regs(&target->thread.fp_regs); | |
789 | ||
790 | return rc; | |
791 | } | |
792 | ||
793 | static const struct user_regset s390_regsets[] = { | |
794 | [REGSET_GENERAL] = { | |
795 | .core_note_type = NT_PRSTATUS, | |
796 | .n = sizeof(s390_regs) / sizeof(long), | |
797 | .size = sizeof(long), | |
798 | .align = sizeof(long), | |
799 | .get = s390_regs_get, | |
800 | .set = s390_regs_set, | |
801 | }, | |
802 | [REGSET_FP] = { | |
803 | .core_note_type = NT_PRFPREG, | |
804 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
805 | .size = sizeof(long), | |
806 | .align = sizeof(long), | |
807 | .get = s390_fpregs_get, | |
808 | .set = s390_fpregs_set, | |
809 | }, | |
810 | }; | |
811 | ||
812 | static const struct user_regset_view user_s390_view = { | |
813 | .name = UTS_MACHINE, | |
814 | .e_machine = EM_S390, | |
815 | .regsets = s390_regsets, | |
816 | .n = ARRAY_SIZE(s390_regsets) | |
817 | }; | |
818 | ||
819 | #ifdef CONFIG_COMPAT | |
820 | static int s390_compat_regs_get(struct task_struct *target, | |
821 | const struct user_regset *regset, | |
822 | unsigned int pos, unsigned int count, | |
823 | void *kbuf, void __user *ubuf) | |
824 | { | |
825 | if (target == current) | |
826 | save_access_regs(target->thread.acrs); | |
827 | ||
828 | if (kbuf) { | |
829 | compat_ulong_t *k = kbuf; | |
830 | while (count > 0) { | |
831 | *k++ = __peek_user_compat(target, pos); | |
832 | count -= sizeof(*k); | |
833 | pos += sizeof(*k); | |
834 | } | |
835 | } else { | |
836 | compat_ulong_t __user *u = ubuf; | |
837 | while (count > 0) { | |
838 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
839 | return -EFAULT; | |
840 | count -= sizeof(*u); | |
841 | pos += sizeof(*u); | |
842 | } | |
843 | } | |
844 | return 0; | |
845 | } | |
846 | ||
847 | static int s390_compat_regs_set(struct task_struct *target, | |
848 | const struct user_regset *regset, | |
849 | unsigned int pos, unsigned int count, | |
850 | const void *kbuf, const void __user *ubuf) | |
851 | { | |
852 | int rc = 0; | |
853 | ||
854 | if (target == current) | |
855 | save_access_regs(target->thread.acrs); | |
856 | ||
857 | if (kbuf) { | |
858 | const compat_ulong_t *k = kbuf; | |
859 | while (count > 0 && !rc) { | |
860 | rc = __poke_user_compat(target, pos, *k++); | |
861 | count -= sizeof(*k); | |
862 | pos += sizeof(*k); | |
863 | } | |
864 | } else { | |
865 | const compat_ulong_t __user *u = ubuf; | |
866 | while (count > 0 && !rc) { | |
867 | compat_ulong_t word; | |
868 | rc = __get_user(word, u++); | |
869 | if (rc) | |
870 | break; | |
871 | rc = __poke_user_compat(target, pos, word); | |
872 | count -= sizeof(*u); | |
873 | pos += sizeof(*u); | |
874 | } | |
875 | } | |
876 | ||
877 | if (rc == 0 && target == current) | |
878 | restore_access_regs(target->thread.acrs); | |
879 | ||
880 | return rc; | |
881 | } | |
882 | ||
ea2a4d3a HC |
883 | static int s390_compat_regs_high_get(struct task_struct *target, |
884 | const struct user_regset *regset, | |
885 | unsigned int pos, unsigned int count, | |
886 | void *kbuf, void __user *ubuf) | |
887 | { | |
888 | compat_ulong_t *gprs_high; | |
889 | ||
890 | gprs_high = (compat_ulong_t *) | |
891 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
892 | if (kbuf) { | |
893 | compat_ulong_t *k = kbuf; | |
894 | while (count > 0) { | |
895 | *k++ = *gprs_high; | |
896 | gprs_high += 2; | |
897 | count -= sizeof(*k); | |
898 | } | |
899 | } else { | |
900 | compat_ulong_t __user *u = ubuf; | |
901 | while (count > 0) { | |
902 | if (__put_user(*gprs_high, u++)) | |
903 | return -EFAULT; | |
904 | gprs_high += 2; | |
905 | count -= sizeof(*u); | |
906 | } | |
907 | } | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static int s390_compat_regs_high_set(struct task_struct *target, | |
912 | const struct user_regset *regset, | |
913 | unsigned int pos, unsigned int count, | |
914 | const void *kbuf, const void __user *ubuf) | |
915 | { | |
916 | compat_ulong_t *gprs_high; | |
917 | int rc = 0; | |
918 | ||
919 | gprs_high = (compat_ulong_t *) | |
920 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
921 | if (kbuf) { | |
922 | const compat_ulong_t *k = kbuf; | |
923 | while (count > 0) { | |
924 | *gprs_high = *k++; | |
925 | *gprs_high += 2; | |
926 | count -= sizeof(*k); | |
927 | } | |
928 | } else { | |
929 | const compat_ulong_t __user *u = ubuf; | |
930 | while (count > 0 && !rc) { | |
931 | unsigned long word; | |
932 | rc = __get_user(word, u++); | |
933 | if (rc) | |
934 | break; | |
935 | *gprs_high = word; | |
936 | *gprs_high += 2; | |
937 | count -= sizeof(*u); | |
938 | } | |
939 | } | |
940 | ||
941 | return rc; | |
942 | } | |
943 | ||
63506c41 MS |
944 | static const struct user_regset s390_compat_regsets[] = { |
945 | [REGSET_GENERAL] = { | |
946 | .core_note_type = NT_PRSTATUS, | |
947 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
948 | .size = sizeof(compat_long_t), | |
949 | .align = sizeof(compat_long_t), | |
950 | .get = s390_compat_regs_get, | |
951 | .set = s390_compat_regs_set, | |
952 | }, | |
953 | [REGSET_FP] = { | |
954 | .core_note_type = NT_PRFPREG, | |
955 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
956 | .size = sizeof(compat_long_t), | |
957 | .align = sizeof(compat_long_t), | |
958 | .get = s390_fpregs_get, | |
959 | .set = s390_fpregs_set, | |
960 | }, | |
ea2a4d3a HC |
961 | [REGSET_GENERAL_EXTENDED] = { |
962 | .core_note_type = NT_PRXSTATUS, | |
963 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), | |
964 | .size = sizeof(compat_long_t), | |
965 | .align = sizeof(compat_long_t), | |
966 | .get = s390_compat_regs_high_get, | |
967 | .set = s390_compat_regs_high_set, | |
968 | }, | |
63506c41 MS |
969 | }; |
970 | ||
971 | static const struct user_regset_view user_s390_compat_view = { | |
972 | .name = "s390", | |
973 | .e_machine = EM_S390, | |
974 | .regsets = s390_compat_regsets, | |
975 | .n = ARRAY_SIZE(s390_compat_regsets) | |
976 | }; | |
977 | #endif | |
978 | ||
979 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
980 | { | |
981 | #ifdef CONFIG_COMPAT | |
982 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
983 | return &user_s390_compat_view; | |
984 | #endif | |
985 | return &user_s390_view; | |
986 | } |