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1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/signal32.c | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) | |
7 | * Gerhard Tonn (ton@de.ibm.com) | |
8 | * | |
9 | * Copyright (C) 1991, 1992 Linus Torvalds | |
10 | * | |
11 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/compat.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/wait.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/stddef.h> | |
27 | #include <linux/tty.h> | |
28 | #include <linux/personality.h> | |
29 | #include <linux/binfmts.h> | |
30 | #include <asm/ucontext.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/lowcore.h> | |
33 | #include "compat_linux.h" | |
34 | #include "compat_ptrace.h" | |
35 | ||
36 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
37 | ||
38 | typedef struct | |
39 | { | |
40 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; | |
41 | struct sigcontext32 sc; | |
42 | _sigregs32 sregs; | |
43 | int signo; | |
44 | __u8 retcode[S390_SYSCALL_SIZE]; | |
45 | } sigframe32; | |
46 | ||
47 | typedef struct | |
48 | { | |
49 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; | |
50 | __u8 retcode[S390_SYSCALL_SIZE]; | |
51 | compat_siginfo_t info; | |
52 | struct ucontext32 uc; | |
53 | } rt_sigframe32; | |
54 | ||
55 | asmlinkage int FASTCALL(do_signal(struct pt_regs *regs, sigset_t *oldset)); | |
56 | ||
57 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
58 | { | |
59 | int err; | |
60 | ||
61 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
62 | return -EFAULT; | |
63 | ||
64 | /* If you change siginfo_t structure, please be sure | |
65 | this code is fixed accordingly. | |
66 | It should never copy any pad contained in the structure | |
67 | to avoid security leaks, but must copy the generic | |
68 | 3 ints plus the relevant union member. | |
69 | This routine must convert siginfo from 64bit to 32bit as well | |
70 | at the same time. */ | |
71 | err = __put_user(from->si_signo, &to->si_signo); | |
72 | err |= __put_user(from->si_errno, &to->si_errno); | |
73 | err |= __put_user((short)from->si_code, &to->si_code); | |
74 | if (from->si_code < 0) | |
75 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
76 | else { | |
77 | switch (from->si_code >> 16) { | |
78 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
79 | case __SI_MESGQ >> 16: | |
80 | err |= __put_user(from->si_int, &to->si_int); | |
81 | /* fallthrough */ | |
82 | case __SI_KILL >> 16: | |
83 | err |= __put_user(from->si_pid, &to->si_pid); | |
84 | err |= __put_user(from->si_uid, &to->si_uid); | |
85 | break; | |
86 | case __SI_CHLD >> 16: | |
87 | err |= __put_user(from->si_pid, &to->si_pid); | |
88 | err |= __put_user(from->si_uid, &to->si_uid); | |
89 | err |= __put_user(from->si_utime, &to->si_utime); | |
90 | err |= __put_user(from->si_stime, &to->si_stime); | |
91 | err |= __put_user(from->si_status, &to->si_status); | |
92 | break; | |
93 | case __SI_FAULT >> 16: | |
94 | err |= __put_user((unsigned long) from->si_addr, | |
95 | &to->si_addr); | |
96 | break; | |
97 | case __SI_POLL >> 16: | |
98 | err |= __put_user(from->si_band, &to->si_band); | |
99 | err |= __put_user(from->si_fd, &to->si_fd); | |
100 | break; | |
101 | case __SI_TIMER >> 16: | |
102 | err |= __put_user(from->si_tid, &to->si_tid); | |
103 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
104 | err |= __put_user(from->si_int, &to->si_int); | |
105 | break; | |
106 | default: | |
107 | break; | |
108 | } | |
109 | } | |
110 | return err; | |
111 | } | |
112 | ||
113 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
114 | { | |
115 | int err; | |
116 | u32 tmp; | |
117 | ||
118 | if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
119 | return -EFAULT; | |
120 | ||
121 | err = __get_user(to->si_signo, &from->si_signo); | |
122 | err |= __get_user(to->si_errno, &from->si_errno); | |
123 | err |= __get_user(to->si_code, &from->si_code); | |
124 | ||
125 | if (to->si_code < 0) | |
126 | err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
127 | else { | |
128 | switch (to->si_code >> 16) { | |
129 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
130 | case __SI_MESGQ >> 16: | |
131 | err |= __get_user(to->si_int, &from->si_int); | |
132 | /* fallthrough */ | |
133 | case __SI_KILL >> 16: | |
134 | err |= __get_user(to->si_pid, &from->si_pid); | |
135 | err |= __get_user(to->si_uid, &from->si_uid); | |
136 | break; | |
137 | case __SI_CHLD >> 16: | |
138 | err |= __get_user(to->si_pid, &from->si_pid); | |
139 | err |= __get_user(to->si_uid, &from->si_uid); | |
140 | err |= __get_user(to->si_utime, &from->si_utime); | |
141 | err |= __get_user(to->si_stime, &from->si_stime); | |
142 | err |= __get_user(to->si_status, &from->si_status); | |
143 | break; | |
144 | case __SI_FAULT >> 16: | |
145 | err |= __get_user(tmp, &from->si_addr); | |
c2814476 | 146 | to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN); |
1da177e4 LT |
147 | break; |
148 | case __SI_POLL >> 16: | |
149 | err |= __get_user(to->si_band, &from->si_band); | |
150 | err |= __get_user(to->si_fd, &from->si_fd); | |
151 | break; | |
152 | case __SI_TIMER >> 16: | |
153 | err |= __get_user(to->si_tid, &from->si_tid); | |
154 | err |= __get_user(to->si_overrun, &from->si_overrun); | |
155 | err |= __get_user(to->si_int, &from->si_int); | |
156 | break; | |
157 | default: | |
158 | break; | |
159 | } | |
160 | } | |
161 | return err; | |
162 | } | |
163 | ||
164 | /* | |
165 | * Atomically swap in the new signal mask, and wait for a signal. | |
166 | */ | |
167 | asmlinkage int | |
168 | sys32_sigsuspend(struct pt_regs * regs,int history0, int history1, old_sigset_t mask) | |
169 | { | |
170 | sigset_t saveset; | |
171 | ||
172 | mask &= _BLOCKABLE; | |
173 | spin_lock_irq(¤t->sighand->siglock); | |
174 | saveset = current->blocked; | |
175 | siginitset(¤t->blocked, mask); | |
176 | recalc_sigpending(); | |
177 | spin_unlock_irq(¤t->sighand->siglock); | |
178 | regs->gprs[2] = -EINTR; | |
179 | ||
180 | while (1) { | |
181 | set_current_state(TASK_INTERRUPTIBLE); | |
182 | schedule(); | |
183 | if (do_signal(regs, &saveset)) | |
184 | return -EINTR; | |
185 | } | |
186 | } | |
187 | ||
188 | asmlinkage int | |
189 | sys32_rt_sigsuspend(struct pt_regs * regs, compat_sigset_t __user *unewset, | |
190 | size_t sigsetsize) | |
191 | { | |
192 | sigset_t saveset, newset; | |
193 | compat_sigset_t set32; | |
194 | ||
195 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
196 | if (sigsetsize != sizeof(sigset_t)) | |
197 | return -EINVAL; | |
198 | ||
199 | if (copy_from_user(&set32, unewset, sizeof(set32))) | |
200 | return -EFAULT; | |
201 | switch (_NSIG_WORDS) { | |
202 | case 4: newset.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32); | |
203 | case 3: newset.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32); | |
204 | case 2: newset.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32); | |
205 | case 1: newset.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32); | |
206 | } | |
207 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
208 | ||
209 | spin_lock_irq(¤t->sighand->siglock); | |
210 | saveset = current->blocked; | |
211 | current->blocked = newset; | |
212 | recalc_sigpending(); | |
213 | spin_unlock_irq(¤t->sighand->siglock); | |
214 | regs->gprs[2] = -EINTR; | |
215 | ||
216 | while (1) { | |
217 | set_current_state(TASK_INTERRUPTIBLE); | |
218 | schedule(); | |
219 | if (do_signal(regs, &saveset)) | |
220 | return -EINTR; | |
221 | } | |
222 | } | |
223 | ||
224 | asmlinkage long | |
225 | sys32_sigaction(int sig, const struct old_sigaction32 __user *act, | |
226 | struct old_sigaction32 __user *oact) | |
227 | { | |
228 | struct k_sigaction new_ka, old_ka; | |
229 | unsigned long sa_handler, sa_restorer; | |
230 | int ret; | |
231 | ||
232 | if (act) { | |
233 | compat_old_sigset_t mask; | |
234 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
235 | __get_user(sa_handler, &act->sa_handler) || | |
236 | __get_user(sa_restorer, &act->sa_restorer)) | |
237 | return -EFAULT; | |
238 | new_ka.sa.sa_handler = (__sighandler_t) sa_handler; | |
239 | new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer; | |
240 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
241 | __get_user(mask, &act->sa_mask); | |
242 | siginitset(&new_ka.sa.sa_mask, mask); | |
243 | } | |
244 | ||
245 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
246 | ||
247 | if (!ret && oact) { | |
248 | sa_handler = (unsigned long) old_ka.sa.sa_handler; | |
249 | sa_restorer = (unsigned long) old_ka.sa.sa_restorer; | |
250 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
251 | __put_user(sa_handler, &oact->sa_handler) || | |
252 | __put_user(sa_restorer, &oact->sa_restorer)) | |
253 | return -EFAULT; | |
254 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
255 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
256 | } | |
257 | ||
258 | return ret; | |
259 | } | |
260 | ||
261 | int | |
262 | do_sigaction(int sig, const struct k_sigaction *act, struct k_sigaction *oact); | |
263 | ||
264 | asmlinkage long | |
265 | sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, | |
266 | struct sigaction32 __user *oact, size_t sigsetsize) | |
267 | { | |
268 | struct k_sigaction new_ka, old_ka; | |
269 | unsigned long sa_handler; | |
270 | int ret; | |
271 | compat_sigset_t set32; | |
272 | ||
273 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
274 | if (sigsetsize != sizeof(compat_sigset_t)) | |
275 | return -EINVAL; | |
276 | ||
277 | if (act) { | |
278 | ret = get_user(sa_handler, &act->sa_handler); | |
279 | ret |= __copy_from_user(&set32, &act->sa_mask, | |
280 | sizeof(compat_sigset_t)); | |
281 | switch (_NSIG_WORDS) { | |
282 | case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6] | |
283 | | (((long)set32.sig[7]) << 32); | |
284 | case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4] | |
285 | | (((long)set32.sig[5]) << 32); | |
286 | case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2] | |
287 | | (((long)set32.sig[3]) << 32); | |
288 | case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0] | |
289 | | (((long)set32.sig[1]) << 32); | |
290 | } | |
291 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
292 | ||
293 | if (ret) | |
294 | return -EFAULT; | |
295 | new_ka.sa.sa_handler = (__sighandler_t) sa_handler; | |
296 | } | |
297 | ||
298 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
299 | ||
300 | if (!ret && oact) { | |
301 | switch (_NSIG_WORDS) { | |
302 | case 4: | |
303 | set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32); | |
304 | set32.sig[6] = old_ka.sa.sa_mask.sig[3]; | |
305 | case 3: | |
306 | set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32); | |
307 | set32.sig[4] = old_ka.sa.sa_mask.sig[2]; | |
308 | case 2: | |
309 | set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32); | |
310 | set32.sig[2] = old_ka.sa.sa_mask.sig[1]; | |
311 | case 1: | |
312 | set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32); | |
313 | set32.sig[0] = old_ka.sa.sa_mask.sig[0]; | |
314 | } | |
315 | ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler); | |
316 | ret |= __copy_to_user(&oact->sa_mask, &set32, | |
317 | sizeof(compat_sigset_t)); | |
318 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
319 | } | |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
324 | asmlinkage long | |
325 | sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss, | |
326 | struct pt_regs *regs) | |
327 | { | |
328 | stack_t kss, koss; | |
329 | unsigned long ss_sp; | |
330 | int ret, err = 0; | |
331 | mm_segment_t old_fs = get_fs(); | |
332 | ||
333 | if (uss) { | |
334 | if (!access_ok(VERIFY_READ, uss, sizeof(*uss))) | |
335 | return -EFAULT; | |
336 | err |= __get_user(ss_sp, &uss->ss_sp); | |
337 | err |= __get_user(kss.ss_size, &uss->ss_size); | |
338 | err |= __get_user(kss.ss_flags, &uss->ss_flags); | |
339 | if (err) | |
340 | return -EFAULT; | |
c2814476 | 341 | kss.ss_sp = (void __user *) ss_sp; |
1da177e4 LT |
342 | } |
343 | ||
344 | set_fs (KERNEL_DS); | |
345 | ret = do_sigaltstack((stack_t __user *) (uss ? &kss : NULL), | |
346 | (stack_t __user *) (uoss ? &koss : NULL), | |
347 | regs->gprs[15]); | |
348 | set_fs (old_fs); | |
349 | ||
350 | if (!ret && uoss) { | |
351 | if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))) | |
352 | return -EFAULT; | |
353 | ss_sp = (unsigned long) koss.ss_sp; | |
354 | err |= __put_user(ss_sp, &uoss->ss_sp); | |
355 | err |= __put_user(koss.ss_size, &uoss->ss_size); | |
356 | err |= __put_user(koss.ss_flags, &uoss->ss_flags); | |
357 | if (err) | |
358 | return -EFAULT; | |
359 | } | |
360 | return ret; | |
361 | } | |
362 | ||
363 | static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs) | |
364 | { | |
365 | _s390_regs_common32 regs32; | |
366 | int err, i; | |
367 | ||
368 | regs32.psw.mask = PSW32_MASK_MERGE(PSW32_USER_BITS, | |
369 | (__u32)(regs->psw.mask >> 32)); | |
370 | regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr; | |
371 | for (i = 0; i < NUM_GPRS; i++) | |
372 | regs32.gprs[i] = (__u32) regs->gprs[i]; | |
373 | save_access_regs(current->thread.acrs); | |
374 | memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs)); | |
375 | err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32)); | |
376 | if (err) | |
377 | return err; | |
378 | save_fp_regs(¤t->thread.fp_regs); | |
379 | /* s390_fp_regs and _s390_fp_regs32 are the same ! */ | |
380 | return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs, | |
381 | sizeof(_s390_fp_regs32)); | |
382 | } | |
383 | ||
384 | static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) | |
385 | { | |
386 | _s390_regs_common32 regs32; | |
387 | int err, i; | |
388 | ||
389 | /* Alwys make any pending restarted system call return -EINTR */ | |
390 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
391 | ||
392 | err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32)); | |
393 | if (err) | |
394 | return err; | |
395 | regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask, | |
396 | (__u64)regs32.psw.mask << 32); | |
397 | regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN); | |
398 | for (i = 0; i < NUM_GPRS; i++) | |
399 | regs->gprs[i] = (__u64) regs32.gprs[i]; | |
400 | memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs)); | |
401 | restore_access_regs(current->thread.acrs); | |
402 | ||
403 | err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs, | |
404 | sizeof(_s390_fp_regs32)); | |
405 | current->thread.fp_regs.fpc &= FPC_VALID_MASK; | |
406 | if (err) | |
407 | return err; | |
408 | ||
409 | restore_fp_regs(¤t->thread.fp_regs); | |
410 | regs->trap = -1; /* disable syscall checks */ | |
411 | return 0; | |
412 | } | |
413 | ||
414 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) | |
415 | { | |
416 | sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15]; | |
417 | sigset_t set; | |
418 | ||
419 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
420 | goto badframe; | |
421 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32)) | |
422 | goto badframe; | |
423 | ||
424 | sigdelsetmask(&set, ~_BLOCKABLE); | |
425 | spin_lock_irq(¤t->sighand->siglock); | |
426 | current->blocked = set; | |
427 | recalc_sigpending(); | |
428 | spin_unlock_irq(¤t->sighand->siglock); | |
429 | ||
430 | if (restore_sigregs32(regs, &frame->sregs)) | |
431 | goto badframe; | |
432 | ||
433 | return regs->gprs[2]; | |
434 | ||
435 | badframe: | |
436 | force_sig(SIGSEGV, current); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) | |
441 | { | |
442 | rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15]; | |
443 | sigset_t set; | |
444 | stack_t st; | |
445 | __u32 ss_sp; | |
446 | int err; | |
447 | mm_segment_t old_fs = get_fs(); | |
448 | ||
449 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
450 | goto badframe; | |
451 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
452 | goto badframe; | |
453 | ||
454 | sigdelsetmask(&set, ~_BLOCKABLE); | |
455 | spin_lock_irq(¤t->sighand->siglock); | |
456 | current->blocked = set; | |
457 | recalc_sigpending(); | |
458 | spin_unlock_irq(¤t->sighand->siglock); | |
459 | ||
460 | if (restore_sigregs32(regs, &frame->uc.uc_mcontext)) | |
461 | goto badframe; | |
462 | ||
463 | err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp); | |
c2814476 | 464 | st.ss_sp = compat_ptr(ss_sp); |
1da177e4 LT |
465 | err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size); |
466 | err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags); | |
467 | if (err) | |
468 | goto badframe; | |
469 | ||
1da177e4 LT |
470 | set_fs (KERNEL_DS); |
471 | do_sigaltstack((stack_t __user *)&st, NULL, regs->gprs[15]); | |
472 | set_fs (old_fs); | |
473 | ||
474 | return regs->gprs[2]; | |
475 | ||
476 | badframe: | |
477 | force_sig(SIGSEGV, current); | |
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Set up a signal frame. | |
483 | */ | |
484 | ||
485 | ||
486 | /* | |
487 | * Determine which stack to use.. | |
488 | */ | |
489 | static inline void __user * | |
490 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
491 | { | |
492 | unsigned long sp; | |
493 | ||
494 | /* Default to using normal stack */ | |
495 | sp = (unsigned long) A(regs->gprs[15]); | |
496 | ||
497 | /* This is the X/Open sanctioned signal stack switching. */ | |
498 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
499 | if (! on_sig_stack(sp)) | |
500 | sp = current->sas_ss_sp + current->sas_ss_size; | |
501 | } | |
502 | ||
503 | /* This is the legacy signal stack switching. */ | |
504 | else if (!user_mode(regs) && | |
505 | !(ka->sa.sa_flags & SA_RESTORER) && | |
506 | ka->sa.sa_restorer) { | |
507 | sp = (unsigned long) ka->sa.sa_restorer; | |
508 | } | |
509 | ||
510 | return (void __user *)((sp - frame_size) & -8ul); | |
511 | } | |
512 | ||
513 | static inline int map_signal(int sig) | |
514 | { | |
515 | if (current_thread_info()->exec_domain | |
516 | && current_thread_info()->exec_domain->signal_invmap | |
517 | && sig < 32) | |
518 | return current_thread_info()->exec_domain->signal_invmap[sig]; | |
519 | else | |
520 | return sig; | |
521 | } | |
522 | ||
523 | static void setup_frame32(int sig, struct k_sigaction *ka, | |
524 | sigset_t *set, struct pt_regs * regs) | |
525 | { | |
526 | sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32)); | |
527 | if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32))) | |
528 | goto give_sigsegv; | |
529 | ||
530 | if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32)) | |
531 | goto give_sigsegv; | |
532 | ||
533 | if (save_sigregs32(regs, &frame->sregs)) | |
534 | goto give_sigsegv; | |
535 | if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs)) | |
536 | goto give_sigsegv; | |
537 | ||
538 | /* Set up to return from userspace. If provided, use a stub | |
539 | already in userspace. */ | |
540 | if (ka->sa.sa_flags & SA_RESTORER) { | |
541 | regs->gprs[14] = (__u64) ka->sa.sa_restorer; | |
542 | } else { | |
543 | regs->gprs[14] = (__u64) frame->retcode; | |
544 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, | |
545 | (u16 __user *)(frame->retcode))) | |
546 | goto give_sigsegv; | |
547 | } | |
548 | ||
549 | /* Set up backchain. */ | |
550 | if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) | |
551 | goto give_sigsegv; | |
552 | ||
553 | /* Set up registers for signal handler */ | |
554 | regs->gprs[15] = (__u64) frame; | |
555 | regs->psw.addr = (__u64) ka->sa.sa_handler; | |
556 | ||
557 | regs->gprs[2] = map_signal(sig); | |
558 | regs->gprs[3] = (__u64) &frame->sc; | |
559 | ||
560 | /* We forgot to include these in the sigcontext. | |
561 | To avoid breaking binary compatibility, they are passed as args. */ | |
562 | regs->gprs[4] = current->thread.trap_no; | |
563 | regs->gprs[5] = current->thread.prot_addr; | |
564 | ||
565 | /* Place signal number on stack to allow backtrace from handler. */ | |
566 | if (__put_user(regs->gprs[2], (int __user *) &frame->signo)) | |
567 | goto give_sigsegv; | |
568 | return; | |
569 | ||
570 | give_sigsegv: | |
571 | force_sigsegv(sig, current); | |
572 | } | |
573 | ||
574 | static void setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info, | |
575 | sigset_t *set, struct pt_regs * regs) | |
576 | { | |
577 | int err = 0; | |
578 | rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32)); | |
579 | if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32))) | |
580 | goto give_sigsegv; | |
581 | ||
582 | if (copy_siginfo_to_user32(&frame->info, info)) | |
583 | goto give_sigsegv; | |
584 | ||
585 | /* Create the ucontext. */ | |
586 | err |= __put_user(0, &frame->uc.uc_flags); | |
587 | err |= __put_user(0, &frame->uc.uc_link); | |
588 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
589 | err |= __put_user(sas_ss_flags(regs->gprs[15]), | |
590 | &frame->uc.uc_stack.ss_flags); | |
591 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
592 | err |= save_sigregs32(regs, &frame->uc.uc_mcontext); | |
593 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
594 | if (err) | |
595 | goto give_sigsegv; | |
596 | ||
597 | /* Set up to return from userspace. If provided, use a stub | |
598 | already in userspace. */ | |
599 | if (ka->sa.sa_flags & SA_RESTORER) { | |
600 | regs->gprs[14] = (__u64) ka->sa.sa_restorer; | |
601 | } else { | |
602 | regs->gprs[14] = (__u64) frame->retcode; | |
603 | err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, | |
604 | (u16 __user *)(frame->retcode)); | |
605 | } | |
606 | ||
607 | /* Set up backchain. */ | |
608 | if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) | |
609 | goto give_sigsegv; | |
610 | ||
611 | /* Set up registers for signal handler */ | |
612 | regs->gprs[15] = (__u64) frame; | |
613 | regs->psw.addr = (__u64) ka->sa.sa_handler; | |
614 | ||
615 | regs->gprs[2] = map_signal(sig); | |
616 | regs->gprs[3] = (__u64) &frame->info; | |
617 | regs->gprs[4] = (__u64) &frame->uc; | |
618 | return; | |
619 | ||
620 | give_sigsegv: | |
621 | force_sigsegv(sig, current); | |
622 | } | |
623 | ||
624 | /* | |
625 | * OK, we're invoking a handler | |
626 | */ | |
627 | ||
628 | void | |
629 | handle_signal32(unsigned long sig, struct k_sigaction *ka, | |
630 | siginfo_t *info, sigset_t *oldset, struct pt_regs * regs) | |
631 | { | |
632 | /* Set up the stack frame */ | |
633 | if (ka->sa.sa_flags & SA_SIGINFO) | |
634 | setup_rt_frame32(sig, ka, info, oldset, regs); | |
635 | else | |
636 | setup_frame32(sig, ka, oldset, regs); | |
637 | ||
69be8f18 SR |
638 | spin_lock_irq(¤t->sighand->siglock); |
639 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
640 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 641 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
642 | recalc_sigpending(); |
643 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
644 | } |
645 |