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[/] [test_project/] [trunk/] [linux_sd_driver/] [arch/] [s390/] [kernel/] [ptrace.c] - Blame information for rev 63

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1 63 marcus.erl 
/*
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>
35 
#include <linux/signal.h>
36 
 
37 
#include <asm/segment.h>
38 
#include <asm/page.h>
39 
#include <asm/pgtable.h>
40 
#include <asm/pgalloc.h>
41 
#include <asm/system.h>
42 
#include <asm/uaccess.h>
43 
#include <asm/unistd.h>
44 
 
45 
#ifdef CONFIG_COMPAT
46 
#include "compat_ptrace.h"
47 
#endif
48 
 
49 
static void
50 
FixPerRegisters(struct task_struct *task)
51 
{
52 
        struct pt_regs *regs;
53 
        per_struct *per_info;
54 
 
55 
        regs = task_pt_regs(task);
56 
        per_info = (per_struct *) &task->thread.per_info;
57 
        per_info->control_regs.bits.em_instruction_fetch =
58 
                per_info->single_step | per_info->instruction_fetch;
59 
 
60 
        if (per_info->single_step) {
61 
                per_info->control_regs.bits.starting_addr = 0;
62 
#ifdef CONFIG_COMPAT
63 
                if (test_thread_flag(TIF_31BIT))
64 
                        per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
65 
                else
66 
#endif
67 
                        per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN;
68 
        } else {
69 
                per_info->control_regs.bits.starting_addr =
70 
                        per_info->starting_addr;
71 
                per_info->control_regs.bits.ending_addr =
72 
                        per_info->ending_addr;
73 
        }
74 
        /*
75 
         * if any of the control reg tracing bits are on
76 
         * we switch on per in the psw
77 
         */
78 
        if (per_info->control_regs.words.cr[0] & PER_EM_MASK)
79 
                regs->psw.mask |= PSW_MASK_PER;
80 
        else
81 
                regs->psw.mask &= ~PSW_MASK_PER;
82 
 
83 
        if (per_info->control_regs.bits.em_storage_alteration)
84 
                per_info->control_regs.bits.storage_alt_space_ctl = 1;
85 
        else
86 
                per_info->control_regs.bits.storage_alt_space_ctl = 0;
87 
}
88 
 
89 
static void set_single_step(struct task_struct *task)
90 
{
91 
        task->thread.per_info.single_step = 1;
92 
        FixPerRegisters(task);
93 
}
94 
 
95 
static void clear_single_step(struct task_struct *task)
96 
{
97 
        task->thread.per_info.single_step = 0;
98 
        FixPerRegisters(task);
99 
}
100 
 
101 
/*
102 
 * Called by kernel/ptrace.c when detaching..
103 
 *
104 
 * Make sure single step bits etc are not set.
105 
 */
106 
void
107 
ptrace_disable(struct task_struct *child)
108 
{
109 
        /* make sure the single step bit is not set. */
110 
        clear_single_step(child);
111 
}
112 
 
113 
#ifndef CONFIG_64BIT
114 
# define __ADDR_MASK 3
115 
#else
116 
# define __ADDR_MASK 7
117 
#endif
118 
 
119 
/*
120 
 * Read the word at offset addr from the user area of a process. The
121 
 * trouble here is that the information is littered over different
122 
 * locations. The process registers are found on the kernel stack,
123 
 * the floating point stuff and the trace settings are stored in
124 
 * the task structure. In addition the different structures in
125 
 * struct user contain pad bytes that should be read as zeroes.
126 
 * Lovely...
127 
 */
128 
static int
129 
peek_user(struct task_struct *child, addr_t addr, addr_t data)
130 
{
131 
        struct user *dummy = NULL;
132 
        addr_t offset, tmp, mask;
133 
 
134 
        /*
135 
         * Stupid gdb peeks/pokes the access registers in 64 bit with
136 
         * an alignment of 4. Programmers from hell...
137 
         */
138 
        mask = __ADDR_MASK;
139 
#ifdef CONFIG_64BIT
140 
        if (addr >= (addr_t) &dummy->regs.acrs &&
141 
            addr < (addr_t) &dummy->regs.orig_gpr2)
142 
                mask = 3;
143 
#endif
144 
        if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
145 
                return -EIO;
146 
 
147 
        if (addr < (addr_t) &dummy->regs.acrs) {
148 
                /*
149 
                 * psw and gprs are stored on the stack
150 
                 */
151 
                tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
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;
161 
#ifdef CONFIG_64BIT
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
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 
                 */
177 
                tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
178 
 
179 
        } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
180 
                /*
181 
                 * floating point regs. are stored in the thread structure
182 
                 */
183 
                offset = addr - (addr_t) &dummy->regs.fp_regs;
184 
                tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
185 
                if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
186 
                        tmp &= (unsigned long) FPC_VALID_MASK
187 
                                << (BITS_PER_LONG - 32);
188 
 
189 
        } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
190 
                /*
191 
                 * per_info is found in the thread structure
192 
                 */
193 
                offset = addr - (addr_t) &dummy->regs.per_info;
194 
                tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset);
195 
 
196 
        } else
197 
                tmp = 0;
198 
 
199 
        return put_user(tmp, (addr_t __user *) data);
200 
}
201 
 
202 
/*
203 
 * Write a word to the user area of a process at location addr. This
204 
 * operation does have an additional problem compared to peek_user.
205 
 * Stores to the program status word and on the floating point
206 
 * control register needs to get checked for validity.
207 
 */
208 
static int
209 
poke_user(struct task_struct *child, addr_t addr, addr_t data)
210 
{
211 
        struct user *dummy = NULL;
212 
        addr_t offset, mask;
213 
 
214 
        /*
215 
         * Stupid gdb peeks/pokes the access registers in 64 bit with
216 
         * an alignment of 4. Programmers from hell indeed...
217 
         */
218 
        mask = __ADDR_MASK;
219 
#ifdef CONFIG_64BIT
220 
        if (addr >= (addr_t) &dummy->regs.acrs &&
221 
            addr < (addr_t) &dummy->regs.orig_gpr2)
222 
                mask = 3;
223 
#endif
224 
        if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
225 
                return -EIO;
226 
 
227 
        if (addr < (addr_t) &dummy->regs.acrs) {
228 
                /*
229 
                 * psw and gprs are stored on the stack
230 
                 */
231 
                if (addr == (addr_t) &dummy->regs.psw.mask &&
232 
#ifdef CONFIG_COMPAT
233 
                    data != PSW_MASK_MERGE(psw_user32_bits, data) &&
234 
#endif
235 
                    data != PSW_MASK_MERGE(psw_user_bits, data))
236 
                        /* Invalid psw mask. */
237 
                        return -EINVAL;
238 
#ifndef CONFIG_64BIT
239 
                if (addr == (addr_t) &dummy->regs.psw.addr)
240 
                        /* I'd like to reject addresses without the
241 
                           high order bit but older gdb's rely on it */
242 
                        data |= PSW_ADDR_AMODE;
243 
#endif
244 
                *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
245 
 
246 
        } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
247 
                /*
248 
                 * access registers are stored in the thread structure
249 
                 */
250 
                offset = addr - (addr_t) &dummy->regs.acrs;
251 
#ifdef CONFIG_64BIT
252 
                /*
253 
                 * Very special case: old & broken 64 bit gdb writing
254 
                 * to acrs[15] with a 64 bit value. Ignore the lower
255 
                 * half of the value and write the upper 32 bit to
256 
                 * acrs[15]. Sick...
257 
                 */
258 
                if (addr == (addr_t) &dummy->regs.acrs[15])
259 
                        child->thread.acrs[15] = (unsigned int) (data >> 32);
260 
                else
261 
#endif
262 
                *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
263 
 
264 
        } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
265 
                /*
266 
                 * orig_gpr2 is stored on the kernel stack
267 
                 */
268 
                task_pt_regs(child)->orig_gpr2 = data;
269 
 
270 
        } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
271 
                /*
272 
                 * floating point regs. are stored in the thread structure
273 
                 */
274 
                if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
275 
                    (data & ~((unsigned long) FPC_VALID_MASK
276 
                              << (BITS_PER_LONG - 32))) != 0)
277 
                        return -EINVAL;
278 
                offset = addr - (addr_t) &dummy->regs.fp_regs;
279 
                *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
280 
 
281 
        } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
282 
                /*
283 
                 * per_info is found in the thread structure
284 
                 */
285 
                offset = addr - (addr_t) &dummy->regs.per_info;
286 
                *(addr_t *)((addr_t) &child->thread.per_info + offset) = data;
287 
 
288 
        }
289 
 
290 
        FixPerRegisters(child);
291 
        return 0;
292 
}
293 
 
294 
static int
295 
do_ptrace_normal(struct task_struct *child, long request, long addr, long data)
296 
{
297 
        ptrace_area parea;
298 
        int copied, ret;
299 
 
300 
        switch (request) {
301 
        case PTRACE_PEEKTEXT:
302 
        case PTRACE_PEEKDATA:
303 
                /* Remove high order bit from address (only for 31 bit). */
304 
                addr &= PSW_ADDR_INSN;
305 
                /* read word at location addr. */
306 
                return generic_ptrace_peekdata(child, addr, data);
307 
 
308 
        case PTRACE_PEEKUSR:
309 
                /* read the word at location addr in the USER area. */
310 
                return peek_user(child, addr, data);
311 
 
312 
        case PTRACE_POKETEXT:
313 
        case PTRACE_POKEDATA:
314 
                /* Remove high order bit from address (only for 31 bit). */
315 
                addr &= PSW_ADDR_INSN;
316 
                /* write the word at location addr. */
317 
                return generic_ptrace_pokedata(child, addr, data);
318 
 
319 
        case PTRACE_POKEUSR:
320 
                /* write the word at location addr in the USER area */
321 
                return poke_user(child, addr, data);
322 
 
323 
        case PTRACE_PEEKUSR_AREA:
324 
        case PTRACE_POKEUSR_AREA:
325 
                if (copy_from_user(&parea, (void __force __user *) addr,
326 
                                                        sizeof(parea)))
327 
                        return -EFAULT;
328 
                addr = parea.kernel_addr;
329 
                data = parea.process_addr;
330 
                copied = 0;
331 
                while (copied < parea.len) {
332 
                        if (request == PTRACE_PEEKUSR_AREA)
333 
                                ret = peek_user(child, addr, data);
334 
                        else {
335 
                                addr_t utmp;
336 
                                if (get_user(utmp,
337 
                                             (addr_t __force __user *) data))
338 
                                        return -EFAULT;
339 
                                ret = poke_user(child, addr, utmp);
340 
                        }
341 
                        if (ret)
342 
                                return ret;
343 
                        addr += sizeof(unsigned long);
344 
                        data += sizeof(unsigned long);
345 
                        copied += sizeof(unsigned long);
346 
                }
347 
                return 0;
348 
        }
349 
        return ptrace_request(child, request, addr, data);
350 
}
351 
 
352 
#ifdef CONFIG_COMPAT
353 
/*
354 
 * Now the fun part starts... a 31 bit program running in the
355 
 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
356 
 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
357 
 * to handle, the difference to the 64 bit versions of the requests
358 
 * is that the access is done in multiples of 4 byte instead of
359 
 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
360 
 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
361 
 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
362 
 * is a 31 bit program too, the content of struct user can be
363 
 * emulated. A 31 bit program peeking into the struct user of
364 
 * a 64 bit program is a no-no.
365 
 */
366 
 
367 
/*
368 
 * Same as peek_user but for a 31 bit program.
369 
 */
370 
static int
371 
peek_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
372 
{
373 
        struct user32 *dummy32 = NULL;
374 
        per_struct32 *dummy_per32 = NULL;
375 
        addr_t offset;
376 
        __u32 tmp;
377 
 
378 
        if (!test_thread_flag(TIF_31BIT) ||
379 
            (addr & 3) || addr > sizeof(struct user) - 3)
380 
                return -EIO;
381 
 
382 
        if (addr < (addr_t) &dummy32->regs.acrs) {
383 
                /*
384 
                 * psw and gprs are stored on the stack
385 
                 */
386 
                if (addr == (addr_t) &dummy32->regs.psw.mask) {
387 
                        /* Fake a 31 bit psw mask. */
388 
                        tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32);
389 
                        tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp);
390 
                } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
391 
                        /* Fake a 31 bit psw address. */
392 
                        tmp = (__u32) task_pt_regs(child)->psw.addr |
393 
                                PSW32_ADDR_AMODE31;
394 
                } else {
395 
                        /* gpr 0-15 */
396 
                        tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw +
397 
                                         addr*2 + 4);
398 
                }
399 
        } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
400 
                /*
401 
                 * access registers are stored in the thread structure
402 
                 */
403 
                offset = addr - (addr_t) &dummy32->regs.acrs;
404 
                tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
405 
 
406 
        } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
407 
                /*
408 
                 * orig_gpr2 is stored on the kernel stack
409 
                 */
410 
                tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
411 
 
412 
        } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
413 
                /*
414 
                 * floating point regs. are stored in the thread structure
415 
                 */
416 
                offset = addr - (addr_t) &dummy32->regs.fp_regs;
417 
                tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
418 
 
419 
        } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
420 
                /*
421 
                 * per_info is found in the thread structure
422 
                 */
423 
                offset = addr - (addr_t) &dummy32->regs.per_info;
424 
                /* This is magic. See per_struct and per_struct32. */
425 
                if ((offset >= (addr_t) &dummy_per32->control_regs &&
426 
                     offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
427 
                    (offset >= (addr_t) &dummy_per32->starting_addr &&
428 
                     offset <= (addr_t) &dummy_per32->ending_addr) ||
429 
                    offset == (addr_t) &dummy_per32->lowcore.words.address)
430 
                        offset = offset*2 + 4;
431 
                else
432 
                        offset = offset*2;
433 
                tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset);
434 
 
435 
        } else
436 
                tmp = 0;
437 
 
438 
        return put_user(tmp, (__u32 __user *) data);
439 
}
440 
 
441 
/*
442 
 * Same as poke_user but for a 31 bit program.
443 
 */
444 
static int
445 
poke_user_emu31(struct task_struct *child, addr_t addr, addr_t data)
446 
{
447 
        struct user32 *dummy32 = NULL;
448 
        per_struct32 *dummy_per32 = NULL;
449 
        addr_t offset;
450 
        __u32 tmp;
451 
 
452 
        if (!test_thread_flag(TIF_31BIT) ||
453 
            (addr & 3) || addr > sizeof(struct user32) - 3)
454 
                return -EIO;
455 
 
456 
        tmp = (__u32) data;
457 
 
458 
        if (addr < (addr_t) &dummy32->regs.acrs) {
459 
                /*
460 
                 * psw, gprs, acrs and orig_gpr2 are stored on the stack
461 
                 */
462 
                if (addr == (addr_t) &dummy32->regs.psw.mask) {
463 
                        /* Build a 64 bit psw mask from 31 bit mask. */
464 
                        if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp))
465 
                                /* Invalid psw mask. */
466 
                                return -EINVAL;
467 
                        task_pt_regs(child)->psw.mask =
468 
                                PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32);
469 
                } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
470 
                        /* Build a 64 bit psw address from 31 bit address. */
471 
                        task_pt_regs(child)->psw.addr =
472 
                                (__u64) tmp & PSW32_ADDR_INSN;
473 
                } else {
474 
                        /* gpr 0-15 */
475 
                        *(__u32*)((addr_t) &task_pt_regs(child)->psw
476 
                                  + addr*2 + 4) = tmp;
477 
                }
478 
        } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
479 
                /*
480 
                 * access registers are stored in the thread structure
481 
                 */
482 
                offset = addr - (addr_t) &dummy32->regs.acrs;
483 
                *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
484 
 
485 
        } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
486 
                /*
487 
                 * orig_gpr2 is stored on the kernel stack
488 
                 */
489 
                *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
490 
 
491 
        } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
492 
                /*
493 
                 * floating point regs. are stored in the thread structure
494 
                 */
495 
                if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
496 
                    (tmp & ~FPC_VALID_MASK) != 0)
497 
                        /* Invalid floating point control. */
498 
                        return -EINVAL;
499 
                offset = addr - (addr_t) &dummy32->regs.fp_regs;
500 
                *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
501 
 
502 
        } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
503 
                /*
504 
                 * per_info is found in the thread structure.
505 
                 */
506 
                offset = addr - (addr_t) &dummy32->regs.per_info;
507 
                /*
508 
                 * This is magic. See per_struct and per_struct32.
509 
                 * By incident the offsets in per_struct are exactly
510 
                 * twice the offsets in per_struct32 for all fields.
511 
                 * The 8 byte fields need special handling though,
512 
                 * because the second half (bytes 4-7) is needed and
513 
                 * not the first half.
514 
                 */
515 
                if ((offset >= (addr_t) &dummy_per32->control_regs &&
516 
                     offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
517 
                    (offset >= (addr_t) &dummy_per32->starting_addr &&
518 
                     offset <= (addr_t) &dummy_per32->ending_addr) ||
519 
                    offset == (addr_t) &dummy_per32->lowcore.words.address)
520 
                        offset = offset*2 + 4;
521 
                else
522 
                        offset = offset*2;
523 
                *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp;
524 
 
525 
        }
526 
 
527 
        FixPerRegisters(child);
528 
        return 0;
529 
}
530 
 
531 
static int
532 
do_ptrace_emu31(struct task_struct *child, long request, long addr, long data)
533 
{
534 
        unsigned int tmp;  /* 4 bytes !! */
535 
        ptrace_area_emu31 parea;
536 
        int copied, ret;
537 
 
538 
        switch (request) {
539 
        case PTRACE_PEEKTEXT:
540 
        case PTRACE_PEEKDATA:
541 
                /* read word at location addr. */
542 
                copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
543 
                if (copied != sizeof(tmp))
544 
                        return -EIO;
545 
                return put_user(tmp, (unsigned int __force __user *) data);
546 
 
547 
        case PTRACE_PEEKUSR:
548 
                /* read the word at location addr in the USER area. */
549 
                return peek_user_emu31(child, addr, data);
550 
 
551 
        case PTRACE_POKETEXT:
552 
        case PTRACE_POKEDATA:
553 
                /* write the word at location addr. */
554 
                tmp = data;
555 
                copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1);
556 
                if (copied != sizeof(tmp))
557 
                        return -EIO;
558 
                return 0;
559 
 
560 
        case PTRACE_POKEUSR:
561 
                /* write the word at location addr in the USER area */
562 
                return poke_user_emu31(child, addr, data);
563 
 
564 
        case PTRACE_PEEKUSR_AREA:
565 
        case PTRACE_POKEUSR_AREA:
566 
                if (copy_from_user(&parea, (void __force __user *) addr,
567 
                                                        sizeof(parea)))
568 
                        return -EFAULT;
569 
                addr = parea.kernel_addr;
570 
                data = parea.process_addr;
571 
                copied = 0;
572 
                while (copied < parea.len) {
573 
                        if (request == PTRACE_PEEKUSR_AREA)
574 
                                ret = peek_user_emu31(child, addr, data);
575 
                        else {
576 
                                __u32 utmp;
577 
                                if (get_user(utmp,
578 
                                             (__u32 __force __user *) data))
579 
                                        return -EFAULT;
580 
                                ret = poke_user_emu31(child, addr, utmp);
581 
                        }
582 
                        if (ret)
583 
                                return ret;
584 
                        addr += sizeof(unsigned int);
585 
                        data += sizeof(unsigned int);
586 
                        copied += sizeof(unsigned int);
587 
                }
588 
                return 0;
589 
        case PTRACE_GETEVENTMSG:
590 
                return put_user((__u32) child->ptrace_message,
591 
                                (unsigned int __force __user *) data);
592 
        case PTRACE_GETSIGINFO:
593 
                if (child->last_siginfo == NULL)
594 
                        return -EINVAL;
595 
                return copy_siginfo_to_user32((compat_siginfo_t
596 
                                               __force __user *) data,
597 
                                              child->last_siginfo);
598 
        case PTRACE_SETSIGINFO:
599 
                if (child->last_siginfo == NULL)
600 
                        return -EINVAL;
601 
                return copy_siginfo_from_user32(child->last_siginfo,
602 
                                                (compat_siginfo_t
603 
                                                 __force __user *) data);
604 
        }
605 
        return ptrace_request(child, request, addr, data);
606 
}
607 
#endif
608 
 
609 
#define PT32_IEEE_IP 0x13c
610 
 
611 
static int
612 
do_ptrace(struct task_struct *child, long request, long addr, long data)
613 
{
614 
        int ret;
615 
 
616 
        if (request == PTRACE_ATTACH)
617 
                return ptrace_attach(child);
618 
 
619 
        /*
620 
         * Special cases to get/store the ieee instructions pointer.
621 
         */
622 
        if (child == current) {
623 
                if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP)
624 
                        return peek_user(child, addr, data);
625 
                if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP)
626 
                        return poke_user(child, addr, data);
627 
#ifdef CONFIG_COMPAT
628 
                if (request == PTRACE_PEEKUSR &&
629 
                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
630 
                        return peek_user_emu31(child, addr, data);
631 
                if (request == PTRACE_POKEUSR &&
632 
                    addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT))
633 
                        return poke_user_emu31(child, addr, data);
634 
#endif
635 
        }
636 
 
637 
        ret = ptrace_check_attach(child, request == PTRACE_KILL);
638 
        if (ret < 0)
639 
                return ret;
640 
 
641 
        switch (request) {
642 
        case PTRACE_SYSCALL:
643 
                /* continue and stop at next (return from) syscall */
644 
        case PTRACE_CONT:
645 
                /* restart after signal. */
646 
                if (!valid_signal(data))
647 
                        return -EIO;
648 
                if (request == PTRACE_SYSCALL)
649 
                        set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
650 
                else
651 
                        clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
652 
                child->exit_code = data;
653 
                /* make sure the single step bit is not set. */
654 
                clear_single_step(child);
655 
                wake_up_process(child);
656 
                return 0;
657 
 
658 
        case PTRACE_KILL:
659 
                /*
660 
                 * make the child exit.  Best I can do is send it a sigkill.
661 
                 * perhaps it should be put in the status that it wants to
662 
                 * exit.
663 
                 */
664 
                if (child->exit_state == EXIT_ZOMBIE) /* already dead */
665 
                        return 0;
666 
                child->exit_code = SIGKILL;
667 
                /* make sure the single step bit is not set. */
668 
                clear_single_step(child);
669 
                wake_up_process(child);
670 
                return 0;
671 
 
672 
        case PTRACE_SINGLESTEP:
673 
                /* set the trap flag. */
674 
                if (!valid_signal(data))
675 
                        return -EIO;
676 
                clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
677 
                child->exit_code = data;
678 
                if (data)
679 
                        set_tsk_thread_flag(child, TIF_SINGLE_STEP);
680 
                else
681 
                        set_single_step(child);
682 
                /* give it a chance to run. */
683 
                wake_up_process(child);
684 
                return 0;
685 
 
686 
        /* Do requests that differ for 31/64 bit */
687 
        default:
688 
#ifdef CONFIG_COMPAT
689 
                if (test_thread_flag(TIF_31BIT))
690 
                        return do_ptrace_emu31(child, request, addr, data);
691 
#endif
692 
                return do_ptrace_normal(child, request, addr, data);
693 
        }
694 
        /* Not reached.  */
695 
        return -EIO;
696 
}
697 
 
698 
asmlinkage long
699 
sys_ptrace(long request, long pid, long addr, long data)
700 
{
701 
        struct task_struct *child;
702 
        int ret;
703 
 
704 
        lock_kernel();
705 
        if (request == PTRACE_TRACEME) {
706 
                 ret = ptrace_traceme();
707 
                 goto out;
708 
        }
709 
 
710 
        child = ptrace_get_task_struct(pid);
711 
        if (IS_ERR(child)) {
712 
                ret = PTR_ERR(child);
713 
                goto out;
714 
        }
715 
 
716 
        ret = do_ptrace(child, request, addr, data);
717 
        put_task_struct(child);
718 
out:
719 
        unlock_kernel();
720 
        return ret;
721 
}
722 
 
723 
asmlinkage void
724 
syscall_trace(struct pt_regs *regs, int entryexit)
725 
{
726 
        if (unlikely(current->audit_context) && entryexit)
727 
                audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]);
728 
 
729 
        if (!test_thread_flag(TIF_SYSCALL_TRACE))
730 
                goto out;
731 
        if (!(current->ptrace & PT_PTRACED))
732 
                goto out;
733 
        ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
734 
                                 ? 0x80 : 0));
735 
 
736 
        /*
737 
         * If the debuffer has set an invalid system call number,
738 
         * we prepare to skip the system call restart handling.
739 
         */
740 
        if (!entryexit && regs->gprs[2] >= NR_syscalls)
741 
                regs->trap = -1;
742 
 
743 
        /*
744 
         * this isn't the same as continuing with a signal, but it will do
745 
         * for normal use.  strace only continues with a signal if the
746 
         * stopping signal is not SIGTRAP.  -brl
747 
         */
748 
        if (current->exit_code) {
749 
                send_sig(current->exit_code, current, 1);
750 
                current->exit_code = 0;
751 
        }
752 
 out:
753 
        if (unlikely(current->audit_context) && !entryexit)
754 
                audit_syscall_entry(test_thread_flag(TIF_31BIT)?AUDIT_ARCH_S390:AUDIT_ARCH_S390X,
755 
                                    regs->gprs[2], regs->orig_gpr2, regs->gprs[3],
756 
                                    regs->gprs[4], regs->gprs[5]);
757 
}

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