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; | |
c3311c13 | 68 | per_cr_words cr_words; |
1da177e4 | 69 | |
c7584fb6 | 70 | regs = task_pt_regs(task); |
1da177e4 LT |
71 | per_info = (per_struct *) &task->thread.per_info; |
72 | per_info->control_regs.bits.em_instruction_fetch = | |
73 | per_info->single_step | per_info->instruction_fetch; | |
74 | ||
75 | if (per_info->single_step) { | |
76 | per_info->control_regs.bits.starting_addr = 0; | |
347a8dc3 | 77 | #ifdef CONFIG_COMPAT |
7757591a | 78 | if (is_compat_task()) |
1da177e4 LT |
79 | per_info->control_regs.bits.ending_addr = 0x7fffffffUL; |
80 | else | |
81 | #endif | |
82 | per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; | |
83 | } else { | |
84 | per_info->control_regs.bits.starting_addr = | |
85 | per_info->starting_addr; | |
86 | per_info->control_regs.bits.ending_addr = | |
87 | per_info->ending_addr; | |
88 | } | |
89 | /* | |
90 | * if any of the control reg tracing bits are on | |
91 | * we switch on per in the psw | |
92 | */ | |
93 | if (per_info->control_regs.words.cr[0] & PER_EM_MASK) | |
94 | regs->psw.mask |= PSW_MASK_PER; | |
95 | else | |
96 | regs->psw.mask &= ~PSW_MASK_PER; | |
97 | ||
98 | if (per_info->control_regs.bits.em_storage_alteration) | |
99 | per_info->control_regs.bits.storage_alt_space_ctl = 1; | |
100 | else | |
101 | per_info->control_regs.bits.storage_alt_space_ctl = 0; | |
c3311c13 MS |
102 | |
103 | if (task == current) { | |
104 | __ctl_store(cr_words, 9, 11); | |
105 | if (memcmp(&cr_words, &per_info->control_regs.words, | |
106 | sizeof(cr_words)) != 0) | |
107 | __ctl_load(per_info->control_regs.words, 9, 11); | |
108 | } | |
1da177e4 LT |
109 | } |
110 | ||
0ac30be4 | 111 | void user_enable_single_step(struct task_struct *task) |
1da177e4 LT |
112 | { |
113 | task->thread.per_info.single_step = 1; | |
114 | FixPerRegisters(task); | |
115 | } | |
116 | ||
0ac30be4 | 117 | void user_disable_single_step(struct task_struct *task) |
1da177e4 LT |
118 | { |
119 | task->thread.per_info.single_step = 0; | |
120 | FixPerRegisters(task); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Called by kernel/ptrace.c when detaching.. | |
125 | * | |
126 | * Make sure single step bits etc are not set. | |
127 | */ | |
128 | void | |
129 | ptrace_disable(struct task_struct *child) | |
130 | { | |
131 | /* make sure the single step bit is not set. */ | |
0ac30be4 | 132 | user_disable_single_step(child); |
1da177e4 LT |
133 | } |
134 | ||
347a8dc3 | 135 | #ifndef CONFIG_64BIT |
1da177e4 LT |
136 | # define __ADDR_MASK 3 |
137 | #else | |
138 | # define __ADDR_MASK 7 | |
139 | #endif | |
140 | ||
141 | /* | |
142 | * Read the word at offset addr from the user area of a process. The | |
143 | * trouble here is that the information is littered over different | |
144 | * locations. The process registers are found on the kernel stack, | |
145 | * the floating point stuff and the trace settings are stored in | |
146 | * the task structure. In addition the different structures in | |
147 | * struct user contain pad bytes that should be read as zeroes. | |
148 | * Lovely... | |
149 | */ | |
63506c41 | 150 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
151 | { |
152 | struct user *dummy = NULL; | |
63506c41 | 153 | addr_t offset, tmp; |
1da177e4 LT |
154 | |
155 | if (addr < (addr_t) &dummy->regs.acrs) { | |
156 | /* | |
157 | * psw and gprs are stored on the stack | |
158 | */ | |
c7584fb6 | 159 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
1da177e4 LT |
160 | if (addr == (addr_t) &dummy->regs.psw.mask) |
161 | /* Remove per bit from user psw. */ | |
162 | tmp &= ~PSW_MASK_PER; | |
163 | ||
164 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
165 | /* | |
166 | * access registers are stored in the thread structure | |
167 | */ | |
168 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 169 | #ifdef CONFIG_64BIT |
778959db MS |
170 | /* |
171 | * Very special case: old & broken 64 bit gdb reading | |
172 | * from acrs[15]. Result is a 64 bit value. Read the | |
173 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
174 | */ | |
175 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
176 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
177 | else | |
178 | #endif | |
1da177e4 LT |
179 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
180 | ||
181 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
182 | /* | |
183 | * orig_gpr2 is stored on the kernel stack | |
184 | */ | |
c7584fb6 | 185 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 186 | |
3d6e48f4 JW |
187 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
188 | /* | |
189 | * prevent reads of padding hole between | |
190 | * orig_gpr2 and fp_regs on s390. | |
191 | */ | |
192 | tmp = 0; | |
193 | ||
1da177e4 LT |
194 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
195 | /* | |
196 | * floating point regs. are stored in the thread structure | |
197 | */ | |
198 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
199 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
778959db MS |
200 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc) |
201 | tmp &= (unsigned long) FPC_VALID_MASK | |
202 | << (BITS_PER_LONG - 32); | |
1da177e4 LT |
203 | |
204 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
205 | /* | |
206 | * per_info is found in the thread structure | |
207 | */ | |
208 | offset = addr - (addr_t) &dummy->regs.per_info; | |
209 | tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); | |
210 | ||
211 | } else | |
212 | tmp = 0; | |
213 | ||
63506c41 | 214 | return tmp; |
1da177e4 LT |
215 | } |
216 | ||
1da177e4 | 217 | static int |
63506c41 | 218 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 219 | { |
63506c41 | 220 | addr_t tmp, mask; |
1da177e4 LT |
221 | |
222 | /* | |
223 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 224 | * an alignment of 4. Programmers from hell... |
1da177e4 | 225 | */ |
778959db | 226 | mask = __ADDR_MASK; |
347a8dc3 | 227 | #ifdef CONFIG_64BIT |
547e3cec MS |
228 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
229 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db MS |
230 | mask = 3; |
231 | #endif | |
232 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
1da177e4 LT |
233 | return -EIO; |
234 | ||
63506c41 MS |
235 | tmp = __peek_user(child, addr); |
236 | return put_user(tmp, (addr_t __user *) data); | |
237 | } | |
238 | ||
239 | /* | |
240 | * Write a word to the user area of a process at location addr. This | |
241 | * operation does have an additional problem compared to peek_user. | |
242 | * Stores to the program status word and on the floating point | |
243 | * control register needs to get checked for validity. | |
244 | */ | |
245 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
246 | { | |
247 | struct user *dummy = NULL; | |
248 | addr_t offset; | |
249 | ||
1da177e4 LT |
250 | if (addr < (addr_t) &dummy->regs.acrs) { |
251 | /* | |
252 | * psw and gprs are stored on the stack | |
253 | */ | |
254 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
347a8dc3 | 255 | #ifdef CONFIG_COMPAT |
c1821c2e | 256 | data != PSW_MASK_MERGE(psw_user32_bits, data) && |
1da177e4 | 257 | #endif |
c1821c2e | 258 | data != PSW_MASK_MERGE(psw_user_bits, data)) |
1da177e4 LT |
259 | /* Invalid psw mask. */ |
260 | return -EINVAL; | |
347a8dc3 | 261 | #ifndef CONFIG_64BIT |
1da177e4 LT |
262 | if (addr == (addr_t) &dummy->regs.psw.addr) |
263 | /* I'd like to reject addresses without the | |
264 | high order bit but older gdb's rely on it */ | |
265 | data |= PSW_ADDR_AMODE; | |
266 | #endif | |
c7584fb6 | 267 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
268 | |
269 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
270 | /* | |
271 | * access registers are stored in the thread structure | |
272 | */ | |
273 | offset = addr - (addr_t) &dummy->regs.acrs; | |
347a8dc3 | 274 | #ifdef CONFIG_64BIT |
778959db MS |
275 | /* |
276 | * Very special case: old & broken 64 bit gdb writing | |
277 | * to acrs[15] with a 64 bit value. Ignore the lower | |
278 | * half of the value and write the upper 32 bit to | |
279 | * acrs[15]. Sick... | |
280 | */ | |
281 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
282 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
283 | else | |
284 | #endif | |
1da177e4 LT |
285 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
286 | ||
287 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
288 | /* | |
289 | * orig_gpr2 is stored on the kernel stack | |
290 | */ | |
c7584fb6 | 291 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 292 | |
3d6e48f4 JW |
293 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
294 | /* | |
295 | * prevent writes of padding hole between | |
296 | * orig_gpr2 and fp_regs on s390. | |
297 | */ | |
298 | return 0; | |
299 | ||
1da177e4 LT |
300 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
301 | /* | |
302 | * floating point regs. are stored in the thread structure | |
303 | */ | |
304 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
778959db MS |
305 | (data & ~((unsigned long) FPC_VALID_MASK |
306 | << (BITS_PER_LONG - 32))) != 0) | |
1da177e4 LT |
307 | return -EINVAL; |
308 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
309 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
310 | ||
311 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
312 | /* | |
313 | * per_info is found in the thread structure | |
314 | */ | |
315 | offset = addr - (addr_t) &dummy->regs.per_info; | |
316 | *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; | |
317 | ||
318 | } | |
319 | ||
320 | FixPerRegisters(child); | |
321 | return 0; | |
322 | } | |
323 | ||
63506c41 MS |
324 | static int |
325 | poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
326 | { | |
63506c41 MS |
327 | addr_t mask; |
328 | ||
329 | /* | |
330 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
331 | * an alignment of 4. Programmers from hell indeed... | |
332 | */ | |
333 | mask = __ADDR_MASK; | |
334 | #ifdef CONFIG_64BIT | |
547e3cec MS |
335 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
336 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 MS |
337 | mask = 3; |
338 | #endif | |
339 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) | |
340 | return -EIO; | |
341 | ||
342 | return __poke_user(child, addr, data); | |
343 | } | |
344 | ||
b499d76b | 345 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 346 | { |
1da177e4 LT |
347 | ptrace_area parea; |
348 | int copied, ret; | |
349 | ||
350 | switch (request) { | |
1da177e4 LT |
351 | case PTRACE_PEEKUSR: |
352 | /* read the word at location addr in the USER area. */ | |
353 | return peek_user(child, addr, data); | |
354 | ||
1da177e4 LT |
355 | case PTRACE_POKEUSR: |
356 | /* write the word at location addr in the USER area */ | |
357 | return poke_user(child, addr, data); | |
358 | ||
359 | case PTRACE_PEEKUSR_AREA: | |
360 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 361 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
362 | sizeof(parea))) |
363 | return -EFAULT; | |
364 | addr = parea.kernel_addr; | |
365 | data = parea.process_addr; | |
366 | copied = 0; | |
367 | while (copied < parea.len) { | |
368 | if (request == PTRACE_PEEKUSR_AREA) | |
369 | ret = peek_user(child, addr, data); | |
370 | else { | |
2b67fc46 HC |
371 | addr_t utmp; |
372 | if (get_user(utmp, | |
373 | (addr_t __force __user *) data)) | |
1da177e4 | 374 | return -EFAULT; |
2b67fc46 | 375 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
376 | } |
377 | if (ret) | |
378 | return ret; | |
379 | addr += sizeof(unsigned long); | |
380 | data += sizeof(unsigned long); | |
381 | copied += sizeof(unsigned long); | |
382 | } | |
383 | return 0; | |
07805ac8 CB |
384 | default: |
385 | /* Removing high order bit from addr (only for 31 bit). */ | |
386 | addr &= PSW_ADDR_INSN; | |
387 | return ptrace_request(child, request, addr, data); | |
1da177e4 | 388 | } |
1da177e4 LT |
389 | } |
390 | ||
347a8dc3 | 391 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
392 | /* |
393 | * Now the fun part starts... a 31 bit program running in the | |
394 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
395 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
396 | * to handle, the difference to the 64 bit versions of the requests | |
397 | * is that the access is done in multiples of 4 byte instead of | |
398 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
399 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
400 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
401 | * is a 31 bit program too, the content of struct user can be | |
402 | * emulated. A 31 bit program peeking into the struct user of | |
403 | * a 64 bit program is a no-no. | |
404 | */ | |
405 | ||
406 | /* | |
407 | * Same as peek_user but for a 31 bit program. | |
408 | */ | |
63506c41 | 409 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 LT |
410 | { |
411 | struct user32 *dummy32 = NULL; | |
412 | per_struct32 *dummy_per32 = NULL; | |
413 | addr_t offset; | |
414 | __u32 tmp; | |
415 | ||
1da177e4 LT |
416 | if (addr < (addr_t) &dummy32->regs.acrs) { |
417 | /* | |
418 | * psw and gprs are stored on the stack | |
419 | */ | |
420 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
421 | /* Fake a 31 bit psw mask. */ | |
c7584fb6 | 422 | tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32); |
c1821c2e | 423 | tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp); |
1da177e4 LT |
424 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
425 | /* Fake a 31 bit psw address. */ | |
c7584fb6 | 426 | tmp = (__u32) task_pt_regs(child)->psw.addr | |
1da177e4 LT |
427 | PSW32_ADDR_AMODE31; |
428 | } else { | |
429 | /* gpr 0-15 */ | |
c7584fb6 | 430 | tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw + |
1da177e4 LT |
431 | addr*2 + 4); |
432 | } | |
433 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
434 | /* | |
435 | * access registers are stored in the thread structure | |
436 | */ | |
437 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
438 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
439 | ||
440 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
441 | /* | |
442 | * orig_gpr2 is stored on the kernel stack | |
443 | */ | |
c7584fb6 | 444 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 445 | |
3d6e48f4 JW |
446 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
447 | /* | |
448 | * prevent reads of padding hole between | |
449 | * orig_gpr2 and fp_regs on s390. | |
450 | */ | |
451 | tmp = 0; | |
452 | ||
1da177e4 LT |
453 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
454 | /* | |
455 | * floating point regs. are stored in the thread structure | |
456 | */ | |
457 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
458 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
459 | ||
460 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
461 | /* | |
462 | * per_info is found in the thread structure | |
463 | */ | |
464 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
465 | /* This is magic. See per_struct and per_struct32. */ | |
466 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
467 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
468 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
469 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
470 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
471 | offset = offset*2 + 4; | |
472 | else | |
473 | offset = offset*2; | |
474 | tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); | |
475 | ||
476 | } else | |
477 | tmp = 0; | |
478 | ||
63506c41 MS |
479 | return tmp; |
480 | } | |
481 | ||
482 | static int peek_user_compat(struct task_struct *child, | |
483 | addr_t addr, addr_t data) | |
484 | { | |
485 | __u32 tmp; | |
486 | ||
7757591a | 487 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
488 | return -EIO; |
489 | ||
490 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
491 | return put_user(tmp, (__u32 __user *) data); |
492 | } | |
493 | ||
494 | /* | |
495 | * Same as poke_user but for a 31 bit program. | |
496 | */ | |
63506c41 MS |
497 | static int __poke_user_compat(struct task_struct *child, |
498 | addr_t addr, addr_t data) | |
1da177e4 LT |
499 | { |
500 | struct user32 *dummy32 = NULL; | |
501 | per_struct32 *dummy_per32 = NULL; | |
63506c41 | 502 | __u32 tmp = (__u32) data; |
1da177e4 | 503 | addr_t offset; |
1da177e4 LT |
504 | |
505 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
506 | /* | |
507 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
508 | */ | |
509 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
510 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
c1821c2e | 511 | if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp)) |
1da177e4 LT |
512 | /* Invalid psw mask. */ |
513 | return -EINVAL; | |
c7584fb6 | 514 | task_pt_regs(child)->psw.mask = |
c1821c2e | 515 | PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32); |
1da177e4 LT |
516 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
517 | /* Build a 64 bit psw address from 31 bit address. */ | |
c7584fb6 | 518 | task_pt_regs(child)->psw.addr = |
1da177e4 LT |
519 | (__u64) tmp & PSW32_ADDR_INSN; |
520 | } else { | |
521 | /* gpr 0-15 */ | |
c7584fb6 | 522 | *(__u32*)((addr_t) &task_pt_regs(child)->psw |
1da177e4 LT |
523 | + addr*2 + 4) = tmp; |
524 | } | |
525 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
526 | /* | |
527 | * access registers are stored in the thread structure | |
528 | */ | |
529 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
530 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
531 | ||
532 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
533 | /* | |
534 | * orig_gpr2 is stored on the kernel stack | |
535 | */ | |
c7584fb6 | 536 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 537 | |
3d6e48f4 JW |
538 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
539 | /* | |
540 | * prevent writess of padding hole between | |
541 | * orig_gpr2 and fp_regs on s390. | |
542 | */ | |
543 | return 0; | |
544 | ||
1da177e4 LT |
545 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
546 | /* | |
547 | * floating point regs. are stored in the thread structure | |
548 | */ | |
549 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
550 | (tmp & ~FPC_VALID_MASK) != 0) | |
551 | /* Invalid floating point control. */ | |
552 | return -EINVAL; | |
553 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
554 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
555 | ||
556 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
557 | /* | |
558 | * per_info is found in the thread structure. | |
559 | */ | |
560 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
561 | /* | |
562 | * This is magic. See per_struct and per_struct32. | |
563 | * By incident the offsets in per_struct are exactly | |
564 | * twice the offsets in per_struct32 for all fields. | |
565 | * The 8 byte fields need special handling though, | |
566 | * because the second half (bytes 4-7) is needed and | |
567 | * not the first half. | |
568 | */ | |
569 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
570 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
571 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
572 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
573 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
574 | offset = offset*2 + 4; | |
575 | else | |
576 | offset = offset*2; | |
577 | *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; | |
578 | ||
579 | } | |
580 | ||
581 | FixPerRegisters(child); | |
582 | return 0; | |
583 | } | |
584 | ||
63506c41 MS |
585 | static int poke_user_compat(struct task_struct *child, |
586 | addr_t addr, addr_t data) | |
587 | { | |
7757591a | 588 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3) |
63506c41 MS |
589 | return -EIO; |
590 | ||
591 | return __poke_user_compat(child, addr, data); | |
592 | } | |
593 | ||
b499d76b RM |
594 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
595 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 596 | { |
b499d76b RM |
597 | unsigned long addr = caddr; |
598 | unsigned long data = cdata; | |
1da177e4 LT |
599 | ptrace_area_emu31 parea; |
600 | int copied, ret; | |
601 | ||
602 | switch (request) { | |
1da177e4 LT |
603 | case PTRACE_PEEKUSR: |
604 | /* read the word at location addr in the USER area. */ | |
63506c41 | 605 | return peek_user_compat(child, addr, data); |
1da177e4 | 606 | |
1da177e4 LT |
607 | case PTRACE_POKEUSR: |
608 | /* write the word at location addr in the USER area */ | |
63506c41 | 609 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
610 | |
611 | case PTRACE_PEEKUSR_AREA: | |
612 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 613 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
614 | sizeof(parea))) |
615 | return -EFAULT; | |
616 | addr = parea.kernel_addr; | |
617 | data = parea.process_addr; | |
618 | copied = 0; | |
619 | while (copied < parea.len) { | |
620 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 621 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 622 | else { |
2b67fc46 HC |
623 | __u32 utmp; |
624 | if (get_user(utmp, | |
625 | (__u32 __force __user *) data)) | |
1da177e4 | 626 | return -EFAULT; |
63506c41 | 627 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
628 | } |
629 | if (ret) | |
630 | return ret; | |
631 | addr += sizeof(unsigned int); | |
632 | data += sizeof(unsigned int); | |
633 | copied += sizeof(unsigned int); | |
634 | } | |
635 | return 0; | |
1da177e4 | 636 | } |
b499d76b | 637 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
638 | } |
639 | #endif | |
640 | ||
753c4dd6 | 641 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 642 | { |
753c4dd6 | 643 | long ret; |
1da177e4 | 644 | |
bcf5cef7 HC |
645 | /* Do the secure computing check first. */ |
646 | secure_computing(regs->gprs[2]); | |
647 | ||
c5c3a6d8 | 648 | /* |
753c4dd6 MS |
649 | * The sysc_tracesys code in entry.S stored the system |
650 | * call number to gprs[2]. | |
c5c3a6d8 | 651 | */ |
753c4dd6 MS |
652 | ret = regs->gprs[2]; |
653 | if (test_thread_flag(TIF_SYSCALL_TRACE) && | |
654 | (tracehook_report_syscall_entry(regs) || | |
655 | regs->gprs[2] >= NR_syscalls)) { | |
656 | /* | |
657 | * Tracing decided this syscall should not happen or the | |
658 | * debugger stored an invalid system call number. Skip | |
659 | * the system call and the system call restart handling. | |
660 | */ | |
59da2139 | 661 | regs->svcnr = 0; |
753c4dd6 | 662 | ret = -1; |
1da177e4 | 663 | } |
753c4dd6 | 664 | |
66700001 | 665 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 666 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 667 | |
753c4dd6 | 668 | if (unlikely(current->audit_context)) |
7757591a | 669 | audit_syscall_entry(is_compat_task() ? |
753c4dd6 MS |
670 | AUDIT_ARCH_S390 : AUDIT_ARCH_S390X, |
671 | regs->gprs[2], regs->orig_gpr2, | |
672 | regs->gprs[3], regs->gprs[4], | |
673 | regs->gprs[5]); | |
674 | return ret; | |
675 | } | |
676 | ||
677 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
678 | { | |
679 | if (unlikely(current->audit_context)) | |
680 | audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), | |
681 | regs->gprs[2]); | |
682 | ||
66700001 | 683 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 684 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 685 | |
753c4dd6 MS |
686 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
687 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 688 | } |
63506c41 MS |
689 | |
690 | /* | |
691 | * user_regset definitions. | |
692 | */ | |
693 | ||
694 | static int s390_regs_get(struct task_struct *target, | |
695 | const struct user_regset *regset, | |
696 | unsigned int pos, unsigned int count, | |
697 | void *kbuf, void __user *ubuf) | |
698 | { | |
699 | if (target == current) | |
700 | save_access_regs(target->thread.acrs); | |
701 | ||
702 | if (kbuf) { | |
703 | unsigned long *k = kbuf; | |
704 | while (count > 0) { | |
705 | *k++ = __peek_user(target, pos); | |
706 | count -= sizeof(*k); | |
707 | pos += sizeof(*k); | |
708 | } | |
709 | } else { | |
710 | unsigned long __user *u = ubuf; | |
711 | while (count > 0) { | |
712 | if (__put_user(__peek_user(target, pos), u++)) | |
713 | return -EFAULT; | |
714 | count -= sizeof(*u); | |
715 | pos += sizeof(*u); | |
716 | } | |
717 | } | |
718 | return 0; | |
719 | } | |
720 | ||
721 | static int s390_regs_set(struct task_struct *target, | |
722 | const struct user_regset *regset, | |
723 | unsigned int pos, unsigned int count, | |
724 | const void *kbuf, const void __user *ubuf) | |
725 | { | |
726 | int rc = 0; | |
727 | ||
728 | if (target == current) | |
729 | save_access_regs(target->thread.acrs); | |
730 | ||
731 | if (kbuf) { | |
732 | const unsigned long *k = kbuf; | |
733 | while (count > 0 && !rc) { | |
734 | rc = __poke_user(target, pos, *k++); | |
735 | count -= sizeof(*k); | |
736 | pos += sizeof(*k); | |
737 | } | |
738 | } else { | |
739 | const unsigned long __user *u = ubuf; | |
740 | while (count > 0 && !rc) { | |
741 | unsigned long word; | |
742 | rc = __get_user(word, u++); | |
743 | if (rc) | |
744 | break; | |
745 | rc = __poke_user(target, pos, word); | |
746 | count -= sizeof(*u); | |
747 | pos += sizeof(*u); | |
748 | } | |
749 | } | |
750 | ||
751 | if (rc == 0 && target == current) | |
752 | restore_access_regs(target->thread.acrs); | |
753 | ||
754 | return rc; | |
755 | } | |
756 | ||
757 | static int s390_fpregs_get(struct task_struct *target, | |
758 | const struct user_regset *regset, unsigned int pos, | |
759 | unsigned int count, void *kbuf, void __user *ubuf) | |
760 | { | |
761 | if (target == current) | |
762 | save_fp_regs(&target->thread.fp_regs); | |
763 | ||
764 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
765 | &target->thread.fp_regs, 0, -1); | |
766 | } | |
767 | ||
768 | static int s390_fpregs_set(struct task_struct *target, | |
769 | const struct user_regset *regset, unsigned int pos, | |
770 | unsigned int count, const void *kbuf, | |
771 | const void __user *ubuf) | |
772 | { | |
773 | int rc = 0; | |
774 | ||
775 | if (target == current) | |
776 | save_fp_regs(&target->thread.fp_regs); | |
777 | ||
778 | /* If setting FPC, must validate it first. */ | |
779 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
780 | u32 fpc[2] = { target->thread.fp_regs.fpc, 0 }; | |
781 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc, | |
782 | 0, offsetof(s390_fp_regs, fprs)); | |
783 | if (rc) | |
784 | return rc; | |
785 | if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0) | |
786 | return -EINVAL; | |
787 | target->thread.fp_regs.fpc = fpc[0]; | |
788 | } | |
789 | ||
790 | if (rc == 0 && count > 0) | |
791 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
792 | target->thread.fp_regs.fprs, | |
793 | offsetof(s390_fp_regs, fprs), -1); | |
794 | ||
795 | if (rc == 0 && target == current) | |
796 | restore_fp_regs(&target->thread.fp_regs); | |
797 | ||
798 | return rc; | |
799 | } | |
800 | ||
801 | static const struct user_regset s390_regsets[] = { | |
802 | [REGSET_GENERAL] = { | |
803 | .core_note_type = NT_PRSTATUS, | |
804 | .n = sizeof(s390_regs) / sizeof(long), | |
805 | .size = sizeof(long), | |
806 | .align = sizeof(long), | |
807 | .get = s390_regs_get, | |
808 | .set = s390_regs_set, | |
809 | }, | |
810 | [REGSET_FP] = { | |
811 | .core_note_type = NT_PRFPREG, | |
812 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
813 | .size = sizeof(long), | |
814 | .align = sizeof(long), | |
815 | .get = s390_fpregs_get, | |
816 | .set = s390_fpregs_set, | |
817 | }, | |
818 | }; | |
819 | ||
820 | static const struct user_regset_view user_s390_view = { | |
821 | .name = UTS_MACHINE, | |
822 | .e_machine = EM_S390, | |
823 | .regsets = s390_regsets, | |
824 | .n = ARRAY_SIZE(s390_regsets) | |
825 | }; | |
826 | ||
827 | #ifdef CONFIG_COMPAT | |
828 | static int s390_compat_regs_get(struct task_struct *target, | |
829 | const struct user_regset *regset, | |
830 | unsigned int pos, unsigned int count, | |
831 | void *kbuf, void __user *ubuf) | |
832 | { | |
833 | if (target == current) | |
834 | save_access_regs(target->thread.acrs); | |
835 | ||
836 | if (kbuf) { | |
837 | compat_ulong_t *k = kbuf; | |
838 | while (count > 0) { | |
839 | *k++ = __peek_user_compat(target, pos); | |
840 | count -= sizeof(*k); | |
841 | pos += sizeof(*k); | |
842 | } | |
843 | } else { | |
844 | compat_ulong_t __user *u = ubuf; | |
845 | while (count > 0) { | |
846 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
847 | return -EFAULT; | |
848 | count -= sizeof(*u); | |
849 | pos += sizeof(*u); | |
850 | } | |
851 | } | |
852 | return 0; | |
853 | } | |
854 | ||
855 | static int s390_compat_regs_set(struct task_struct *target, | |
856 | const struct user_regset *regset, | |
857 | unsigned int pos, unsigned int count, | |
858 | const void *kbuf, const void __user *ubuf) | |
859 | { | |
860 | int rc = 0; | |
861 | ||
862 | if (target == current) | |
863 | save_access_regs(target->thread.acrs); | |
864 | ||
865 | if (kbuf) { | |
866 | const compat_ulong_t *k = kbuf; | |
867 | while (count > 0 && !rc) { | |
868 | rc = __poke_user_compat(target, pos, *k++); | |
869 | count -= sizeof(*k); | |
870 | pos += sizeof(*k); | |
871 | } | |
872 | } else { | |
873 | const compat_ulong_t __user *u = ubuf; | |
874 | while (count > 0 && !rc) { | |
875 | compat_ulong_t word; | |
876 | rc = __get_user(word, u++); | |
877 | if (rc) | |
878 | break; | |
879 | rc = __poke_user_compat(target, pos, word); | |
880 | count -= sizeof(*u); | |
881 | pos += sizeof(*u); | |
882 | } | |
883 | } | |
884 | ||
885 | if (rc == 0 && target == current) | |
886 | restore_access_regs(target->thread.acrs); | |
887 | ||
888 | return rc; | |
889 | } | |
890 | ||
ea2a4d3a HC |
891 | static int s390_compat_regs_high_get(struct task_struct *target, |
892 | const struct user_regset *regset, | |
893 | unsigned int pos, unsigned int count, | |
894 | void *kbuf, void __user *ubuf) | |
895 | { | |
896 | compat_ulong_t *gprs_high; | |
897 | ||
898 | gprs_high = (compat_ulong_t *) | |
899 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
900 | if (kbuf) { | |
901 | compat_ulong_t *k = kbuf; | |
902 | while (count > 0) { | |
903 | *k++ = *gprs_high; | |
904 | gprs_high += 2; | |
905 | count -= sizeof(*k); | |
906 | } | |
907 | } else { | |
908 | compat_ulong_t __user *u = ubuf; | |
909 | while (count > 0) { | |
910 | if (__put_user(*gprs_high, u++)) | |
911 | return -EFAULT; | |
912 | gprs_high += 2; | |
913 | count -= sizeof(*u); | |
914 | } | |
915 | } | |
916 | return 0; | |
917 | } | |
918 | ||
919 | static int s390_compat_regs_high_set(struct task_struct *target, | |
920 | const struct user_regset *regset, | |
921 | unsigned int pos, unsigned int count, | |
922 | const void *kbuf, const void __user *ubuf) | |
923 | { | |
924 | compat_ulong_t *gprs_high; | |
925 | int rc = 0; | |
926 | ||
927 | gprs_high = (compat_ulong_t *) | |
928 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
929 | if (kbuf) { | |
930 | const compat_ulong_t *k = kbuf; | |
931 | while (count > 0) { | |
932 | *gprs_high = *k++; | |
933 | *gprs_high += 2; | |
934 | count -= sizeof(*k); | |
935 | } | |
936 | } else { | |
937 | const compat_ulong_t __user *u = ubuf; | |
938 | while (count > 0 && !rc) { | |
939 | unsigned long word; | |
940 | rc = __get_user(word, u++); | |
941 | if (rc) | |
942 | break; | |
943 | *gprs_high = word; | |
944 | *gprs_high += 2; | |
945 | count -= sizeof(*u); | |
946 | } | |
947 | } | |
948 | ||
949 | return rc; | |
950 | } | |
951 | ||
63506c41 MS |
952 | static const struct user_regset s390_compat_regsets[] = { |
953 | [REGSET_GENERAL] = { | |
954 | .core_note_type = NT_PRSTATUS, | |
955 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
956 | .size = sizeof(compat_long_t), | |
957 | .align = sizeof(compat_long_t), | |
958 | .get = s390_compat_regs_get, | |
959 | .set = s390_compat_regs_set, | |
960 | }, | |
961 | [REGSET_FP] = { | |
962 | .core_note_type = NT_PRFPREG, | |
963 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
964 | .size = sizeof(compat_long_t), | |
965 | .align = sizeof(compat_long_t), | |
966 | .get = s390_fpregs_get, | |
967 | .set = s390_fpregs_set, | |
968 | }, | |
ea2a4d3a | 969 | [REGSET_GENERAL_EXTENDED] = { |
622e99bf | 970 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
971 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
972 | .size = sizeof(compat_long_t), | |
973 | .align = sizeof(compat_long_t), | |
974 | .get = s390_compat_regs_high_get, | |
975 | .set = s390_compat_regs_high_set, | |
976 | }, | |
63506c41 MS |
977 | }; |
978 | ||
979 | static const struct user_regset_view user_s390_compat_view = { | |
980 | .name = "s390", | |
981 | .e_machine = EM_S390, | |
982 | .regsets = s390_compat_regsets, | |
983 | .n = ARRAY_SIZE(s390_compat_regsets) | |
984 | }; | |
985 | #endif | |
986 | ||
987 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
988 | { | |
989 | #ifdef CONFIG_COMPAT | |
990 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
991 | return &user_s390_compat_view; | |
992 | #endif | |
993 | return &user_s390_view; | |
994 | } | |
952974ac HC |
995 | |
996 | static const char *gpr_names[NUM_GPRS] = { | |
997 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
998 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
999 | }; | |
1000 | ||
1001 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1002 | { | |
1003 | if (offset >= NUM_GPRS) | |
1004 | return 0; | |
1005 | return regs->gprs[offset]; | |
1006 | } | |
1007 | ||
1008 | int regs_query_register_offset(const char *name) | |
1009 | { | |
1010 | unsigned long offset; | |
1011 | ||
1012 | if (!name || *name != 'r') | |
1013 | return -EINVAL; | |
1014 | if (strict_strtoul(name + 1, 10, &offset)) | |
1015 | return -EINVAL; | |
1016 | if (offset >= NUM_GPRS) | |
1017 | return -EINVAL; | |
1018 | return offset; | |
1019 | } | |
1020 | ||
1021 | const char *regs_query_register_name(unsigned int offset) | |
1022 | { | |
1023 | if (offset >= NUM_GPRS) | |
1024 | return NULL; | |
1025 | return gpr_names[offset]; | |
1026 | } | |
1027 | ||
1028 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1029 | { | |
1030 | unsigned long ksp = kernel_stack_pointer(regs); | |
1031 | ||
1032 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1037 | * @regs:pt_regs which contains kernel stack pointer. | |
1038 | * @n:stack entry number. | |
1039 | * | |
1040 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1041 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1042 | * this returns 0. | |
1043 | */ | |
1044 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1045 | { | |
1046 | unsigned long addr; | |
1047 | ||
1048 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1049 | if (!regs_within_kernel_stack(regs, addr)) | |
1050 | return 0; | |
1051 | return *(unsigned long *)addr; | |
1052 | } |