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1 /* ptrace.c: FRV specific parts of process tracing
2  *
3  * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  * - Derived from arch/m68k/kernel/ptrace.c
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/mm.h>
16 #include <linux/smp.h>
17 #include <linux/errno.h>
18 #include <linux/ptrace.h>
19 #include <linux/user.h>
20 #include <linux/security.h>
21 #include <linux/signal.h>
22 
23 #include <asm/uaccess.h>
24 #include <asm/page.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
28 #include <asm/unistd.h>
29 
30 /*
31  * does not yet catch signals sent when the child dies.
32  * in exit.c or in signal.c.
33  */
34 
35 /*
36  * Get contents of register REGNO in task TASK.
37  */
get_reg(struct task_struct * task,int regno)38 static inline long get_reg(struct task_struct *task, int regno)
39 {
40 	struct user_context *user = task->thread.user;
41 
42 	if (regno < 0 || regno >= PT__END)
43 		return 0;
44 
45 	return ((unsigned long *) user)[regno];
46 }
47 
48 /*
49  * Write contents of register REGNO in task TASK.
50  */
put_reg(struct task_struct * task,int regno,unsigned long data)51 static inline int put_reg(struct task_struct *task, int regno,
52 			  unsigned long data)
53 {
54 	struct user_context *user = task->thread.user;
55 
56 	if (regno < 0 || regno >= PT__END)
57 		return -EIO;
58 
59 	switch (regno) {
60 	case PT_GR(0):
61 		return 0;
62 	case PT_PSR:
63 	case PT__STATUS:
64 		return -EIO;
65 	default:
66 		((unsigned long *) user)[regno] = data;
67 		return 0;
68 	}
69 }
70 
71 /*
72  * check that an address falls within the bounds of the target process's memory
73  * mappings
74  */
is_user_addr_valid(struct task_struct * child,unsigned long start,unsigned long len)75 static inline int is_user_addr_valid(struct task_struct *child,
76 				     unsigned long start, unsigned long len)
77 {
78 #ifdef CONFIG_MMU
79 	if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
80 		return -EIO;
81 	return 0;
82 #else
83 	struct vm_area_struct *vma;
84 
85 	vma = find_vma(child->mm, start);
86 	if (vma && start >= vma->vm_start && start + len <= vma->vm_end)
87 		return 0;
88 
89 	return -EIO;
90 #endif
91 }
92 
93 /*
94  * Called by kernel/ptrace.c when detaching..
95  *
96  * Control h/w single stepping
97  */
ptrace_disable(struct task_struct * child)98 void ptrace_disable(struct task_struct *child)
99 {
100 	child->thread.frame0->__status &= ~REG__STATUS_STEP;
101 }
102 
ptrace_enable(struct task_struct * child)103 void ptrace_enable(struct task_struct *child)
104 {
105 	child->thread.frame0->__status |= REG__STATUS_STEP;
106 }
107 
arch_ptrace(struct task_struct * child,long request,long addr,long data)108 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
109 {
110 	unsigned long tmp;
111 	int ret;
112 
113 	switch (request) {
114 		/* when I and D space are separate, these will need to be fixed. */
115 	case PTRACE_PEEKTEXT: /* read word at location addr. */
116 	case PTRACE_PEEKDATA:
117 		ret = -EIO;
118 		if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
119 			break;
120 		ret = generic_ptrace_peekdata(child, addr, data);
121 		break;
122 
123 		/* read the word at location addr in the USER area. */
124 	case PTRACE_PEEKUSR: {
125 		tmp = 0;
126 		ret = -EIO;
127 		if ((addr & 3) || addr < 0)
128 			break;
129 
130 		ret = 0;
131 		switch (addr >> 2) {
132 		case 0 ... PT__END - 1:
133 			tmp = get_reg(child, addr >> 2);
134 			break;
135 
136 		case PT__END + 0:
137 			tmp = child->mm->end_code - child->mm->start_code;
138 			break;
139 
140 		case PT__END + 1:
141 			tmp = child->mm->end_data - child->mm->start_data;
142 			break;
143 
144 		case PT__END + 2:
145 			tmp = child->mm->start_stack - child->mm->start_brk;
146 			break;
147 
148 		case PT__END + 3:
149 			tmp = child->mm->start_code;
150 			break;
151 
152 		case PT__END + 4:
153 			tmp = child->mm->start_stack;
154 			break;
155 
156 		default:
157 			ret = -EIO;
158 			break;
159 		}
160 
161 		if (ret == 0)
162 			ret = put_user(tmp, (unsigned long *) data);
163 		break;
164 	}
165 
166 		/* when I and D space are separate, this will have to be fixed. */
167 	case PTRACE_POKETEXT: /* write the word at location addr. */
168 	case PTRACE_POKEDATA:
169 		ret = -EIO;
170 		if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
171 			break;
172 		ret = generic_ptrace_pokedata(child, addr, data);
173 		break;
174 
175 	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
176 		ret = -EIO;
177 		if ((addr & 3) || addr < 0)
178 			break;
179 
180 		ret = 0;
181 		switch (addr >> 2) {
182 		case 0 ... PT__END-1:
183 			ret = put_reg(child, addr >> 2, data);
184 			break;
185 
186 		default:
187 			ret = -EIO;
188 			break;
189 		}
190 		break;
191 
192 	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
193 	case PTRACE_CONT: /* restart after signal. */
194 		ret = -EIO;
195 		if (!valid_signal(data))
196 			break;
197 		if (request == PTRACE_SYSCALL)
198 			set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
199 		else
200 			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
201 		child->exit_code = data;
202 		ptrace_disable(child);
203 		wake_up_process(child);
204 		ret = 0;
205 		break;
206 
207 		/* make the child exit.  Best I can do is send it a sigkill.
208 		 * perhaps it should be put in the status that it wants to
209 		 * exit.
210 		 */
211 	case PTRACE_KILL:
212 		ret = 0;
213 		if (child->exit_state == EXIT_ZOMBIE)	/* already dead */
214 			break;
215 		child->exit_code = SIGKILL;
216 		clear_tsk_thread_flag(child, TIF_SINGLESTEP);
217 		ptrace_disable(child);
218 		wake_up_process(child);
219 		break;
220 
221 	case PTRACE_SINGLESTEP:  /* set the trap flag. */
222 		ret = -EIO;
223 		if (!valid_signal(data))
224 			break;
225 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
226 		ptrace_enable(child);
227 		child->exit_code = data;
228 		wake_up_process(child);
229 		ret = 0;
230 		break;
231 
232 	case PTRACE_DETACH:	/* detach a process that was attached. */
233 		ret = ptrace_detach(child, data);
234 		break;
235 
236 	case PTRACE_GETREGS: { /* Get all integer regs from the child. */
237 		int i;
238 		for (i = 0; i < PT__GPEND; i++) {
239 			tmp = get_reg(child, i);
240 			if (put_user(tmp, (unsigned long *) data)) {
241 				ret = -EFAULT;
242 				break;
243 			}
244 			data += sizeof(long);
245 		}
246 		ret = 0;
247 		break;
248 	}
249 
250 	case PTRACE_SETREGS: { /* Set all integer regs in the child. */
251 		int i;
252 		for (i = 0; i < PT__GPEND; i++) {
253 			if (get_user(tmp, (unsigned long *) data)) {
254 				ret = -EFAULT;
255 				break;
256 			}
257 			put_reg(child, i, tmp);
258 			data += sizeof(long);
259 		}
260 		ret = 0;
261 		break;
262 	}
263 
264 	case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
265 		ret = 0;
266 		if (copy_to_user((void *) data,
267 				 &child->thread.user->f,
268 				 sizeof(child->thread.user->f)))
269 			ret = -EFAULT;
270 		break;
271 	}
272 
273 	case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
274 		ret = 0;
275 		if (copy_from_user(&child->thread.user->f,
276 				   (void *) data,
277 				   sizeof(child->thread.user->f)))
278 			ret = -EFAULT;
279 		break;
280 	}
281 
282 	case PTRACE_GETFDPIC:
283 		tmp = 0;
284 		switch (addr) {
285 		case PTRACE_GETFDPIC_EXEC:
286 			tmp = child->mm->context.exec_fdpic_loadmap;
287 			break;
288 		case PTRACE_GETFDPIC_INTERP:
289 			tmp = child->mm->context.interp_fdpic_loadmap;
290 			break;
291 		default:
292 			break;
293 		}
294 
295 		ret = 0;
296 		if (put_user(tmp, (unsigned long *) data)) {
297 			ret = -EFAULT;
298 			break;
299 		}
300 		break;
301 
302 	default:
303 		ret = -EIO;
304 		break;
305 	}
306 	return ret;
307 }
308 
309 int __nongprelbss kstrace;
310 
311 static const struct {
312 	const char	*name;
313 	unsigned	argmask;
314 } __syscall_name_table[NR_syscalls] = {
315 	[0]	= { "restart_syscall"			},
316 	[1]	= { "exit",		0x000001	},
317 	[2]	= { "fork",		0xffffff	},
318 	[3]	= { "read",		0x000141	},
319 	[4]	= { "write",		0x000141	},
320 	[5]	= { "open",		0x000235	},
321 	[6]	= { "close",		0x000001	},
322 	[7]	= { "waitpid",		0x000141	},
323 	[8]	= { "creat",		0x000025	},
324 	[9]	= { "link",		0x000055	},
325 	[10]	= { "unlink",		0x000005	},
326 	[11]	= { "execve",		0x000445	},
327 	[12]	= { "chdir",		0x000005	},
328 	[13]	= { "time",		0x000004	},
329 	[14]	= { "mknod",		0x000325	},
330 	[15]	= { "chmod",		0x000025	},
331 	[16]	= { "lchown",		0x000025	},
332 	[17]	= { "break" },
333 	[18]	= { "oldstat",		0x000045	},
334 	[19]	= { "lseek",		0x000131	},
335 	[20]	= { "getpid",		0xffffff	},
336 	[21]	= { "mount",		0x043555	},
337 	[22]	= { "umount",		0x000005	},
338 	[23]	= { "setuid",		0x000001	},
339 	[24]	= { "getuid",		0xffffff	},
340 	[25]	= { "stime",		0x000004	},
341 	[26]	= { "ptrace",		0x004413	},
342 	[27]	= { "alarm",		0x000001	},
343 	[28]	= { "oldfstat",		0x000041	},
344 	[29]	= { "pause",		0xffffff	},
345 	[30]	= { "utime",		0x000045	},
346 	[31]	= { "stty" },
347 	[32]	= { "gtty" },
348 	[33]	= { "access",		0x000025	},
349 	[34]	= { "nice",		0x000001	},
350 	[35]	= { "ftime" },
351 	[36]	= { "sync",		0xffffff	},
352 	[37]	= { "kill",		0x000011	},
353 	[38]	= { "rename",		0x000055	},
354 	[39]	= { "mkdir",		0x000025	},
355 	[40]	= { "rmdir",		0x000005	},
356 	[41]	= { "dup",		0x000001	},
357 	[42]	= { "pipe",		0x000004	},
358 	[43]	= { "times",		0x000004	},
359 	[44]	= { "prof" },
360 	[45]	= { "brk",		0x000004	},
361 	[46]	= { "setgid",		0x000001	},
362 	[47]	= { "getgid",		0xffffff	},
363 	[48]	= { "signal",		0x000041	},
364 	[49]	= { "geteuid",		0xffffff	},
365 	[50]	= { "getegid",		0xffffff	},
366 	[51]	= { "acct",		0x000005	},
367 	[52]	= { "umount2",		0x000035	},
368 	[53]	= { "lock" },
369 	[54]	= { "ioctl",		0x000331	},
370 	[55]	= { "fcntl",		0x000331	},
371 	[56]	= { "mpx" },
372 	[57]	= { "setpgid",		0x000011	},
373 	[58]	= { "ulimit" },
374 	[60]	= { "umask",		0x000002	},
375 	[61]	= { "chroot",		0x000005	},
376 	[62]	= { "ustat",		0x000043	},
377 	[63]	= { "dup2",		0x000011	},
378 	[64]	= { "getppid",		0xffffff	},
379 	[65]	= { "getpgrp",		0xffffff	},
380 	[66]	= { "setsid",		0xffffff	},
381 	[67]	= { "sigaction" },
382 	[68]	= { "sgetmask" },
383 	[69]	= { "ssetmask" },
384 	[70]	= { "setreuid" },
385 	[71]	= { "setregid" },
386 	[72]	= { "sigsuspend" },
387 	[73]	= { "sigpending" },
388 	[74]	= { "sethostname" },
389 	[75]	= { "setrlimit" },
390 	[76]	= { "getrlimit" },
391 	[77]	= { "getrusage" },
392 	[78]	= { "gettimeofday" },
393 	[79]	= { "settimeofday" },
394 	[80]	= { "getgroups" },
395 	[81]	= { "setgroups" },
396 	[82]	= { "select" },
397 	[83]	= { "symlink" },
398 	[84]	= { "oldlstat" },
399 	[85]	= { "readlink" },
400 	[86]	= { "uselib" },
401 	[87]	= { "swapon" },
402 	[88]	= { "reboot" },
403 	[89]	= { "readdir" },
404 	[91]	= { "munmap",		0x000034	},
405 	[92]	= { "truncate" },
406 	[93]	= { "ftruncate" },
407 	[94]	= { "fchmod" },
408 	[95]	= { "fchown" },
409 	[96]	= { "getpriority" },
410 	[97]	= { "setpriority" },
411 	[99]	= { "statfs" },
412 	[100]	= { "fstatfs" },
413 	[102]	= { "socketcall" },
414 	[103]	= { "syslog" },
415 	[104]	= { "setitimer" },
416 	[105]	= { "getitimer" },
417 	[106]	= { "stat" },
418 	[107]	= { "lstat" },
419 	[108]	= { "fstat" },
420 	[111]	= { "vhangup" },
421 	[114]	= { "wait4" },
422 	[115]	= { "swapoff" },
423 	[116]	= { "sysinfo" },
424 	[117]	= { "ipc" },
425 	[118]	= { "fsync" },
426 	[119]	= { "sigreturn" },
427 	[120]	= { "clone" },
428 	[121]	= { "setdomainname" },
429 	[122]	= { "uname" },
430 	[123]	= { "modify_ldt" },
431 	[123]	= { "cacheflush" },
432 	[124]	= { "adjtimex" },
433 	[125]	= { "mprotect" },
434 	[126]	= { "sigprocmask" },
435 	[127]	= { "create_module" },
436 	[128]	= { "init_module" },
437 	[129]	= { "delete_module" },
438 	[130]	= { "get_kernel_syms" },
439 	[131]	= { "quotactl" },
440 	[132]	= { "getpgid" },
441 	[133]	= { "fchdir" },
442 	[134]	= { "bdflush" },
443 	[135]	= { "sysfs" },
444 	[136]	= { "personality" },
445 	[137]	= { "afs_syscall" },
446 	[138]	= { "setfsuid" },
447 	[139]	= { "setfsgid" },
448 	[140]	= { "_llseek",			0x014331	},
449 	[141]	= { "getdents" },
450 	[142]	= { "_newselect",		0x000141	},
451 	[143]	= { "flock" },
452 	[144]	= { "msync" },
453 	[145]	= { "readv" },
454 	[146]	= { "writev" },
455 	[147]	= { "getsid",			0x000001	},
456 	[148]	= { "fdatasync",		0x000001	},
457 	[149]	= { "_sysctl",			0x000004	},
458 	[150]	= { "mlock" },
459 	[151]	= { "munlock" },
460 	[152]	= { "mlockall" },
461 	[153]	= { "munlockall" },
462 	[154]	= { "sched_setparam" },
463 	[155]	= { "sched_getparam" },
464 	[156]	= { "sched_setscheduler" },
465 	[157]	= { "sched_getscheduler" },
466 	[158]	= { "sched_yield" },
467 	[159]	= { "sched_get_priority_max" },
468 	[160]	= { "sched_get_priority_min" },
469 	[161]	= { "sched_rr_get_interval" },
470 	[162]	= { "nanosleep",		0x000044	},
471 	[163]	= { "mremap" },
472 	[164]	= { "setresuid" },
473 	[165]	= { "getresuid" },
474 	[166]	= { "vm86" },
475 	[167]	= { "query_module" },
476 	[168]	= { "poll" },
477 	[169]	= { "nfsservctl" },
478 	[170]	= { "setresgid" },
479 	[171]	= { "getresgid" },
480 	[172]	= { "prctl",			0x333331	},
481 	[173]	= { "rt_sigreturn",		0xffffff	},
482 	[174]	= { "rt_sigaction",		0x001441	},
483 	[175]	= { "rt_sigprocmask",		0x001441	},
484 	[176]	= { "rt_sigpending",		0x000014	},
485 	[177]	= { "rt_sigtimedwait",		0x001444	},
486 	[178]	= { "rt_sigqueueinfo",		0x000411	},
487 	[179]	= { "rt_sigsuspend",		0x000014	},
488 	[180]	= { "pread",			0x003341	},
489 	[181]	= { "pwrite",			0x003341	},
490 	[182]	= { "chown",			0x000115	},
491 	[183]	= { "getcwd" },
492 	[184]	= { "capget" },
493 	[185]	= { "capset" },
494 	[186]	= { "sigaltstack" },
495 	[187]	= { "sendfile" },
496 	[188]	= { "getpmsg" },
497 	[189]	= { "putpmsg" },
498 	[190]	= { "vfork",			0xffffff	},
499 	[191]	= { "ugetrlimit" },
500 	[192]	= { "mmap2",			0x313314	},
501 	[193]	= { "truncate64" },
502 	[194]	= { "ftruncate64" },
503 	[195]	= { "stat64",			0x000045	},
504 	[196]	= { "lstat64",			0x000045	},
505 	[197]	= { "fstat64",			0x000041	},
506 	[198]	= { "lchown32" },
507 	[199]	= { "getuid32",			0xffffff	},
508 	[200]	= { "getgid32",			0xffffff	},
509 	[201]	= { "geteuid32",		0xffffff	},
510 	[202]	= { "getegid32",		0xffffff	},
511 	[203]	= { "setreuid32" },
512 	[204]	= { "setregid32" },
513 	[205]	= { "getgroups32" },
514 	[206]	= { "setgroups32" },
515 	[207]	= { "fchown32" },
516 	[208]	= { "setresuid32" },
517 	[209]	= { "getresuid32" },
518 	[210]	= { "setresgid32" },
519 	[211]	= { "getresgid32" },
520 	[212]	= { "chown32" },
521 	[213]	= { "setuid32" },
522 	[214]	= { "setgid32" },
523 	[215]	= { "setfsuid32" },
524 	[216]	= { "setfsgid32" },
525 	[217]	= { "pivot_root" },
526 	[218]	= { "mincore" },
527 	[219]	= { "madvise" },
528 	[220]	= { "getdents64" },
529 	[221]	= { "fcntl64" },
530 	[223]	= { "security" },
531 	[224]	= { "gettid" },
532 	[225]	= { "readahead" },
533 	[226]	= { "setxattr" },
534 	[227]	= { "lsetxattr" },
535 	[228]	= { "fsetxattr" },
536 	[229]	= { "getxattr" },
537 	[230]	= { "lgetxattr" },
538 	[231]	= { "fgetxattr" },
539 	[232]	= { "listxattr" },
540 	[233]	= { "llistxattr" },
541 	[234]	= { "flistxattr" },
542 	[235]	= { "removexattr" },
543 	[236]	= { "lremovexattr" },
544 	[237]	= { "fremovexattr" },
545 	[238]	= { "tkill" },
546 	[239]	= { "sendfile64" },
547 	[240]	= { "futex" },
548 	[241]	= { "sched_setaffinity" },
549 	[242]	= { "sched_getaffinity" },
550 	[243]	= { "set_thread_area" },
551 	[244]	= { "get_thread_area" },
552 	[245]	= { "io_setup" },
553 	[246]	= { "io_destroy" },
554 	[247]	= { "io_getevents" },
555 	[248]	= { "io_submit" },
556 	[249]	= { "io_cancel" },
557 	[250]	= { "fadvise64" },
558 	[252]	= { "exit_group",		0x000001	},
559 	[253]	= { "lookup_dcookie" },
560 	[254]	= { "epoll_create" },
561 	[255]	= { "epoll_ctl" },
562 	[256]	= { "epoll_wait" },
563 	[257]	= { "remap_file_pages" },
564 	[258]	= { "set_tid_address" },
565 	[259]	= { "timer_create" },
566 	[260]	= { "timer_settime" },
567 	[261]	= { "timer_gettime" },
568 	[262]	= { "timer_getoverrun" },
569 	[263]	= { "timer_delete" },
570 	[264]	= { "clock_settime" },
571 	[265]	= { "clock_gettime" },
572 	[266]	= { "clock_getres" },
573 	[267]	= { "clock_nanosleep" },
574 	[268]	= { "statfs64" },
575 	[269]	= { "fstatfs64" },
576 	[270]	= { "tgkill" },
577 	[271]	= { "utimes" },
578 	[272]	= { "fadvise64_64" },
579 	[273]	= { "vserver" },
580 	[274]	= { "mbind" },
581 	[275]	= { "get_mempolicy" },
582 	[276]	= { "set_mempolicy" },
583 	[277]	= { "mq_open" },
584 	[278]	= { "mq_unlink" },
585 	[279]	= { "mq_timedsend" },
586 	[280]	= { "mq_timedreceive" },
587 	[281]	= { "mq_notify" },
588 	[282]	= { "mq_getsetattr" },
589 	[283]	= { "sys_kexec_load" },
590 };
591 
do_syscall_trace(int leaving)592 asmlinkage void do_syscall_trace(int leaving)
593 {
594 #if 0
595 	unsigned long *argp;
596 	const char *name;
597 	unsigned argmask;
598 	char buffer[16];
599 
600 	if (!kstrace)
601 		return;
602 
603 	if (!current->mm)
604 		return;
605 
606 	if (__frame->gr7 == __NR_close)
607 		return;
608 
609 #if 0
610 	if (__frame->gr7 != __NR_mmap2 &&
611 	    __frame->gr7 != __NR_vfork &&
612 	    __frame->gr7 != __NR_execve &&
613 	    __frame->gr7 != __NR_exit)
614 		return;
615 #endif
616 
617 	argmask = 0;
618 	name = NULL;
619 	if (__frame->gr7 < NR_syscalls) {
620 		name = __syscall_name_table[__frame->gr7].name;
621 		argmask = __syscall_name_table[__frame->gr7].argmask;
622 	}
623 	if (!name) {
624 		sprintf(buffer, "sys_%lx", __frame->gr7);
625 		name = buffer;
626 	}
627 
628 	if (!leaving) {
629 		if (!argmask) {
630 			printk(KERN_CRIT "[%d] %s(%lx,%lx,%lx,%lx,%lx,%lx)\n",
631 			       current->pid,
632 			       name,
633 			       __frame->gr8,
634 			       __frame->gr9,
635 			       __frame->gr10,
636 			       __frame->gr11,
637 			       __frame->gr12,
638 			       __frame->gr13);
639 		}
640 		else if (argmask == 0xffffff) {
641 			printk(KERN_CRIT "[%d] %s()\n",
642 			       current->pid,
643 			       name);
644 		}
645 		else {
646 			printk(KERN_CRIT "[%d] %s(",
647 			       current->pid,
648 			       name);
649 
650 			argp = &__frame->gr8;
651 
652 			do {
653 				switch (argmask & 0xf) {
654 				case 1:
655 					printk("%ld", (long) *argp);
656 					break;
657 				case 2:
658 					printk("%lo", *argp);
659 					break;
660 				case 3:
661 					printk("%lx", *argp);
662 					break;
663 				case 4:
664 					printk("%p", (void *) *argp);
665 					break;
666 				case 5:
667 					printk("\"%s\"", (char *) *argp);
668 					break;
669 				}
670 
671 				argp++;
672 				argmask >>= 4;
673 				if (argmask)
674 					printk(",");
675 
676 			} while (argmask);
677 
678 			printk(")\n");
679 		}
680 	}
681 	else {
682 		if ((int)__frame->gr8 > -4096 && (int)__frame->gr8 < 4096)
683 			printk(KERN_CRIT "[%d] %s() = %ld\n", current->pid, name, __frame->gr8);
684 		else
685 			printk(KERN_CRIT "[%d] %s() = %lx\n", current->pid, name, __frame->gr8);
686 	}
687 	return;
688 #endif
689 
690 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
691 		return;
692 
693 	if (!(current->ptrace & PT_PTRACED))
694 		return;
695 
696 	/* we need to indicate entry or exit to strace */
697 	if (leaving)
698 		__frame->__status |= REG__STATUS_SYSC_EXIT;
699 	else
700 		__frame->__status |= REG__STATUS_SYSC_ENTRY;
701 
702 	ptrace_notify(SIGTRAP);
703 
704 	/*
705 	 * this isn't the same as continuing with a signal, but it will do
706 	 * for normal use.  strace only continues with a signal if the
707 	 * stopping signal is not SIGTRAP.  -brl
708 	 */
709 	if (current->exit_code) {
710 		send_sig(current->exit_code, current, 1);
711 		current->exit_code = 0;
712 	}
713 }
714