Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
934135c1 | 2 | * SuperH process tracing |
1da177e4 | 3 | * |
934135c1 PM |
4 | * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka |
5 | * Copyright (C) 2002 - 2008 Paul Mundt | |
1da177e4 | 6 | * |
934135c1 PM |
7 | * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp> |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
1da177e4 | 12 | */ |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/user.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/security.h> | |
7ed20e1a | 22 | #include <linux/signal.h> |
9432f968 | 23 | #include <linux/io.h> |
1322b9de | 24 | #include <linux/audit.h> |
c4637d47 | 25 | #include <linux/seccomp.h> |
ab99c733 | 26 | #include <linux/tracehook.h> |
934135c1 PM |
27 | #include <linux/elf.h> |
28 | #include <linux/regset.h> | |
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/mmu_context.h> | |
fa43972f | 34 | #include <asm/syscalls.h> |
e7ab3cd2 | 35 | #include <asm/fpu.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | /* |
38 | * This routine will get a word off of the process kernel stack. | |
39 | */ | |
40 | static inline int get_stack_long(struct task_struct *task, int offset) | |
41 | { | |
42 | unsigned char *stack; | |
43 | ||
3cf0f4ec | 44 | stack = (unsigned char *)task_pt_regs(task); |
1da177e4 LT |
45 | stack += offset; |
46 | return (*((int *)stack)); | |
47 | } | |
48 | ||
49 | /* | |
50 | * This routine will put a word on the process kernel stack. | |
51 | */ | |
52 | static inline int put_stack_long(struct task_struct *task, int offset, | |
53 | unsigned long data) | |
54 | { | |
55 | unsigned char *stack; | |
56 | ||
3cf0f4ec | 57 | stack = (unsigned char *)task_pt_regs(task); |
1da177e4 LT |
58 | stack += offset; |
59 | *(unsigned long *) stack = data; | |
60 | return 0; | |
61 | } | |
62 | ||
c459dbf2 PM |
63 | void user_enable_single_step(struct task_struct *child) |
64 | { | |
c459dbf2 PM |
65 | /* Next scheduling will set up UBC */ |
66 | if (child->thread.ubc_pc == 0) | |
67 | ubc_usercnt += 1; | |
68 | ||
934135c1 PM |
69 | child->thread.ubc_pc = get_stack_long(child, |
70 | offsetof(struct pt_regs, pc)); | |
c459dbf2 PM |
71 | |
72 | set_tsk_thread_flag(child, TIF_SINGLESTEP); | |
73 | } | |
74 | ||
75 | void user_disable_single_step(struct task_struct *child) | |
9432f968 SM |
76 | { |
77 | clear_tsk_thread_flag(child, TIF_SINGLESTEP); | |
78 | ||
79 | /* | |
80 | * Ensure the UBC is not programmed at the next context switch. | |
81 | * | |
82 | * Normally this is not needed but there are sequences such as | |
83 | * singlestep, signal delivery, and continue that leave the | |
84 | * ubc_pc non-zero leading to spurious SIGTRAPs. | |
85 | */ | |
86 | if (child->thread.ubc_pc != 0) { | |
87 | ubc_usercnt -= 1; | |
88 | child->thread.ubc_pc = 0; | |
89 | } | |
90 | } | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * Called by kernel/ptrace.c when detaching.. | |
94 | * | |
95 | * Make sure single step bits etc are not set. | |
96 | */ | |
97 | void ptrace_disable(struct task_struct *child) | |
98 | { | |
c459dbf2 | 99 | user_disable_single_step(child); |
1da177e4 LT |
100 | } |
101 | ||
934135c1 PM |
102 | static int genregs_get(struct task_struct *target, |
103 | const struct user_regset *regset, | |
104 | unsigned int pos, unsigned int count, | |
105 | void *kbuf, void __user *ubuf) | |
106 | { | |
107 | const struct pt_regs *regs = task_pt_regs(target); | |
108 | int ret; | |
109 | ||
110 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
111 | regs->regs, | |
112 | 0, 16 * sizeof(unsigned long)); | |
113 | if (!ret) | |
114 | /* PC, PR, SR, GBR, MACH, MACL, TRA */ | |
115 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
116 | ®s->pc, | |
117 | offsetof(struct pt_regs, pc), | |
118 | sizeof(struct pt_regs)); | |
119 | if (!ret) | |
120 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
121 | sizeof(struct pt_regs), -1); | |
122 | ||
123 | return ret; | |
124 | } | |
125 | ||
126 | static int genregs_set(struct task_struct *target, | |
127 | const struct user_regset *regset, | |
128 | unsigned int pos, unsigned int count, | |
129 | const void *kbuf, const void __user *ubuf) | |
130 | { | |
131 | struct pt_regs *regs = task_pt_regs(target); | |
132 | int ret; | |
133 | ||
134 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
135 | regs->regs, | |
136 | 0, 16 * sizeof(unsigned long)); | |
137 | if (!ret && count > 0) | |
138 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
139 | ®s->pc, | |
140 | offsetof(struct pt_regs, pc), | |
141 | sizeof(struct pt_regs)); | |
142 | if (!ret) | |
143 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
144 | sizeof(struct pt_regs), -1); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
e7ab3cd2 PM |
149 | #ifdef CONFIG_SH_FPU |
150 | int fpregs_get(struct task_struct *target, | |
151 | const struct user_regset *regset, | |
152 | unsigned int pos, unsigned int count, | |
153 | void *kbuf, void __user *ubuf) | |
154 | { | |
155 | int ret; | |
156 | ||
157 | ret = init_fpu(target); | |
158 | if (ret) | |
159 | return ret; | |
160 | ||
161 | if ((boot_cpu_data.flags & CPU_HAS_FPU)) | |
162 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
163 | &target->thread.fpu.hard, 0, -1); | |
164 | ||
165 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
166 | &target->thread.fpu.soft, 0, -1); | |
167 | } | |
168 | ||
169 | static int fpregs_set(struct task_struct *target, | |
170 | const struct user_regset *regset, | |
171 | unsigned int pos, unsigned int count, | |
172 | const void *kbuf, const void __user *ubuf) | |
173 | { | |
174 | int ret; | |
175 | ||
176 | ret = init_fpu(target); | |
177 | if (ret) | |
178 | return ret; | |
179 | ||
180 | set_stopped_child_used_math(target); | |
181 | ||
182 | if ((boot_cpu_data.flags & CPU_HAS_FPU)) | |
183 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
184 | &target->thread.fpu.hard, 0, -1); | |
185 | ||
186 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
187 | &target->thread.fpu.soft, 0, -1); | |
188 | } | |
189 | ||
190 | static int fpregs_active(struct task_struct *target, | |
191 | const struct user_regset *regset) | |
192 | { | |
193 | return tsk_used_math(target) ? regset->n : 0; | |
194 | } | |
195 | #endif | |
196 | ||
5dadb343 PM |
197 | #ifdef CONFIG_SH_DSP |
198 | static int dspregs_get(struct task_struct *target, | |
199 | const struct user_regset *regset, | |
200 | unsigned int pos, unsigned int count, | |
201 | void *kbuf, void __user *ubuf) | |
202 | { | |
203 | const struct pt_dspregs *regs = task_pt_dspregs(target); | |
204 | int ret; | |
205 | ||
206 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, | |
207 | 0, sizeof(struct pt_dspregs)); | |
208 | if (!ret) | |
209 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
210 | sizeof(struct pt_dspregs), -1); | |
211 | ||
212 | return ret; | |
213 | } | |
214 | ||
215 | static int dspregs_set(struct task_struct *target, | |
216 | const struct user_regset *regset, | |
217 | unsigned int pos, unsigned int count, | |
218 | const void *kbuf, const void __user *ubuf) | |
219 | { | |
220 | struct pt_dspregs *regs = task_pt_dspregs(target); | |
221 | int ret; | |
222 | ||
223 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, | |
224 | 0, sizeof(struct pt_dspregs)); | |
225 | if (!ret) | |
226 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
227 | sizeof(struct pt_dspregs), -1); | |
228 | ||
229 | return ret; | |
230 | } | |
72461997 PM |
231 | |
232 | static int dspregs_active(struct task_struct *target, | |
233 | const struct user_regset *regset) | |
234 | { | |
235 | struct pt_regs *regs = task_pt_regs(target); | |
236 | ||
237 | return regs->sr & SR_DSP ? regset->n : 0; | |
238 | } | |
5dadb343 PM |
239 | #endif |
240 | ||
934135c1 PM |
241 | /* |
242 | * These are our native regset flavours. | |
243 | */ | |
244 | enum sh_regset { | |
245 | REGSET_GENERAL, | |
e7ab3cd2 PM |
246 | #ifdef CONFIG_SH_FPU |
247 | REGSET_FPU, | |
248 | #endif | |
5dadb343 PM |
249 | #ifdef CONFIG_SH_DSP |
250 | REGSET_DSP, | |
251 | #endif | |
934135c1 PM |
252 | }; |
253 | ||
254 | static const struct user_regset sh_regsets[] = { | |
255 | /* | |
256 | * Format is: | |
257 | * R0 --> R15 | |
258 | * PC, PR, SR, GBR, MACH, MACL, TRA | |
259 | */ | |
260 | [REGSET_GENERAL] = { | |
261 | .core_note_type = NT_PRSTATUS, | |
262 | .n = ELF_NGREG, | |
263 | .size = sizeof(long), | |
264 | .align = sizeof(long), | |
265 | .get = genregs_get, | |
266 | .set = genregs_set, | |
267 | }, | |
5dadb343 | 268 | |
e7ab3cd2 PM |
269 | #ifdef CONFIG_SH_FPU |
270 | [REGSET_FPU] = { | |
271 | .core_note_type = NT_PRFPREG, | |
272 | .n = sizeof(struct user_fpu_struct) / sizeof(long), | |
273 | .size = sizeof(long), | |
274 | .align = sizeof(long), | |
275 | .get = fpregs_get, | |
276 | .set = fpregs_set, | |
277 | .active = fpregs_active, | |
278 | }, | |
279 | #endif | |
280 | ||
5dadb343 PM |
281 | #ifdef CONFIG_SH_DSP |
282 | [REGSET_DSP] = { | |
283 | .n = sizeof(struct pt_dspregs) / sizeof(long), | |
284 | .size = sizeof(long), | |
285 | .align = sizeof(long), | |
286 | .get = dspregs_get, | |
287 | .set = dspregs_set, | |
72461997 | 288 | .active = dspregs_active, |
5dadb343 PM |
289 | }, |
290 | #endif | |
934135c1 PM |
291 | }; |
292 | ||
293 | static const struct user_regset_view user_sh_native_view = { | |
294 | .name = "sh", | |
295 | .e_machine = EM_SH, | |
296 | .regsets = sh_regsets, | |
297 | .n = ARRAY_SIZE(sh_regsets), | |
298 | }; | |
299 | ||
f9540ece PM |
300 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
301 | { | |
302 | return &user_sh_native_view; | |
303 | } | |
304 | ||
481bed45 | 305 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 306 | { |
1da177e4 | 307 | struct user * dummy = NULL; |
fa43972f | 308 | unsigned long __user *datap = (unsigned long __user *)data; |
1da177e4 LT |
309 | int ret; |
310 | ||
1da177e4 | 311 | switch (request) { |
1da177e4 LT |
312 | /* read the word at location addr in the USER area. */ |
313 | case PTRACE_PEEKUSR: { | |
314 | unsigned long tmp; | |
315 | ||
316 | ret = -EIO; | |
9432f968 | 317 | if ((addr & 3) || addr < 0 || |
1da177e4 LT |
318 | addr > sizeof(struct user) - 3) |
319 | break; | |
320 | ||
321 | if (addr < sizeof(struct pt_regs)) | |
322 | tmp = get_stack_long(child, addr); | |
323 | else if (addr >= (long) &dummy->fpu && | |
324 | addr < (long) &dummy->u_fpvalid) { | |
325 | if (!tsk_used_math(child)) { | |
326 | if (addr == (long)&dummy->fpu.fpscr) | |
327 | tmp = FPSCR_INIT; | |
328 | else | |
329 | tmp = 0; | |
330 | } else | |
331 | tmp = ((long *)&child->thread.fpu) | |
332 | [(addr - (long)&dummy->fpu) >> 2]; | |
333 | } else if (addr == (long) &dummy->u_fpvalid) | |
334 | tmp = !!tsk_used_math(child); | |
335 | else | |
336 | tmp = 0; | |
fa43972f | 337 | ret = put_user(tmp, datap); |
1da177e4 LT |
338 | break; |
339 | } | |
340 | ||
1da177e4 LT |
341 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
342 | ret = -EIO; | |
9432f968 | 343 | if ((addr & 3) || addr < 0 || |
1da177e4 LT |
344 | addr > sizeof(struct user) - 3) |
345 | break; | |
346 | ||
347 | if (addr < sizeof(struct pt_regs)) | |
348 | ret = put_stack_long(child, addr, data); | |
349 | else if (addr >= (long) &dummy->fpu && | |
350 | addr < (long) &dummy->u_fpvalid) { | |
351 | set_stopped_child_used_math(child); | |
352 | ((long *)&child->thread.fpu) | |
353 | [(addr - (long)&dummy->fpu) >> 2] = data; | |
354 | ret = 0; | |
355 | } else if (addr == (long) &dummy->u_fpvalid) { | |
356 | conditional_stopped_child_used_math(data, child); | |
357 | ret = 0; | |
358 | } | |
359 | break; | |
360 | ||
934135c1 PM |
361 | case PTRACE_GETREGS: |
362 | return copy_regset_to_user(child, &user_sh_native_view, | |
363 | REGSET_GENERAL, | |
364 | 0, sizeof(struct pt_regs), | |
365 | (void __user *)data); | |
366 | case PTRACE_SETREGS: | |
367 | return copy_regset_from_user(child, &user_sh_native_view, | |
368 | REGSET_GENERAL, | |
369 | 0, sizeof(struct pt_regs), | |
370 | (const void __user *)data); | |
e7ab3cd2 PM |
371 | #ifdef CONFIG_SH_FPU |
372 | case PTRACE_GETFPREGS: | |
373 | return copy_regset_to_user(child, &user_sh_native_view, | |
374 | REGSET_FPU, | |
375 | 0, sizeof(struct user_fpu_struct), | |
376 | (void __user *)data); | |
377 | case PTRACE_SETFPREGS: | |
378 | return copy_regset_from_user(child, &user_sh_native_view, | |
379 | REGSET_FPU, | |
380 | 0, sizeof(struct user_fpu_struct), | |
381 | (const void __user *)data); | |
382 | #endif | |
1da177e4 | 383 | #ifdef CONFIG_SH_DSP |
5dadb343 PM |
384 | case PTRACE_GETDSPREGS: |
385 | return copy_regset_to_user(child, &user_sh_native_view, | |
386 | REGSET_DSP, | |
387 | 0, sizeof(struct pt_dspregs), | |
388 | (void __user *)data); | |
389 | case PTRACE_SETDSPREGS: | |
390 | return copy_regset_from_user(child, &user_sh_native_view, | |
391 | REGSET_DSP, | |
392 | 0, sizeof(struct pt_dspregs), | |
393 | (const void __user *)data); | |
3bc24a1a PM |
394 | #endif |
395 | #ifdef CONFIG_BINFMT_ELF_FDPIC | |
396 | case PTRACE_GETFDPIC: { | |
397 | unsigned long tmp = 0; | |
398 | ||
399 | switch (addr) { | |
400 | case PTRACE_GETFDPIC_EXEC: | |
401 | tmp = child->mm->context.exec_fdpic_loadmap; | |
402 | break; | |
403 | case PTRACE_GETFDPIC_INTERP: | |
404 | tmp = child->mm->context.interp_fdpic_loadmap; | |
405 | break; | |
406 | default: | |
407 | break; | |
408 | } | |
409 | ||
410 | ret = 0; | |
fa43972f | 411 | if (put_user(tmp, datap)) { |
3bc24a1a PM |
412 | ret = -EFAULT; |
413 | break; | |
414 | } | |
415 | break; | |
416 | } | |
1da177e4 LT |
417 | #endif |
418 | default: | |
419 | ret = ptrace_request(child, request, addr, data); | |
420 | break; | |
421 | } | |
481bed45 | 422 | |
1da177e4 LT |
423 | return ret; |
424 | } | |
425 | ||
9e5e2117 PM |
426 | static inline int audit_arch(void) |
427 | { | |
428 | int arch = EM_SH; | |
429 | ||
430 | #ifdef CONFIG_CPU_LITTLE_ENDIAN | |
431 | arch |= __AUDIT_ARCH_LE; | |
432 | #endif | |
433 | ||
434 | return arch; | |
435 | } | |
436 | ||
ab99c733 | 437 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 438 | { |
ab99c733 | 439 | long ret = 0; |
1da177e4 | 440 | |
c4637d47 PM |
441 | secure_computing(regs->regs[0]); |
442 | ||
ab99c733 PM |
443 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
444 | tracehook_report_syscall_entry(regs)) | |
445 | /* | |
446 | * Tracing decided this syscall should not happen. | |
447 | * We'll return a bogus call number to get an ENOSYS | |
448 | * error, but leave the original number in regs->regs[0]. | |
449 | */ | |
450 | ret = -1L; | |
1322b9de | 451 | |
ab99c733 | 452 | if (unlikely(current->audit_context)) |
9e5e2117 | 453 | audit_syscall_entry(audit_arch(), regs->regs[3], |
1322b9de YN |
454 | regs->regs[4], regs->regs[5], |
455 | regs->regs[6], regs->regs[7]); | |
456 | ||
ab99c733 PM |
457 | return ret ?: regs->regs[0]; |
458 | } | |
459 | ||
460 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) | |
461 | { | |
462 | int step; | |
463 | ||
464 | if (unlikely(current->audit_context)) | |
465 | audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]), | |
466 | regs->regs[0]); | |
467 | ||
468 | step = test_thread_flag(TIF_SINGLESTEP); | |
469 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
470 | tracehook_report_syscall_exit(regs, step); | |
1da177e4 | 471 | } |