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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/kernel/signal.c | |
3 | * | |
4 | * Copyright (c) 2003 Hitoshi Yamamoto | |
5 | * | |
6 | * Taken from i386 version. | |
7 | * Copyright (C) 1991, 1992 Linus Torvalds | |
8 | * | |
9 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
10 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/sched.h> |
14 | #include <linux/mm.h> | |
15 | #include <linux/smp.h> | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/personality.h> | |
7dfb7103 | 23 | #include <linux/freezer.h> |
1da177e4 LT |
24 | #include <asm/cacheflush.h> |
25 | #include <asm/ucontext.h> | |
26 | #include <asm/uaccess.h> | |
27 | ||
28 | #define DEBUG_SIG 0 | |
29 | ||
30 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
31 | ||
32 | int do_signal(struct pt_regs *, sigset_t *); | |
33 | ||
34 | asmlinkage int | |
870e75a2 | 35 | sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, |
1da177e4 | 36 | unsigned long r2, unsigned long r3, unsigned long r4, |
6ced13cd | 37 | unsigned long r5, unsigned long r6, struct pt_regs *regs) |
1da177e4 | 38 | { |
c37a3303 | 39 | sigset_t newset; |
1da177e4 LT |
40 | |
41 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
42 | if (sigsetsize != sizeof(sigset_t)) | |
43 | return -EINVAL; | |
44 | ||
45 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
46 | return -EFAULT; | |
c37a3303 | 47 | sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
1da177e4 LT |
48 | |
49 | spin_lock_irq(¤t->sighand->siglock); | |
c37a3303 | 50 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
51 | current->blocked = newset; |
52 | recalc_sigpending(); | |
53 | spin_unlock_irq(¤t->sighand->siglock); | |
54 | ||
c37a3303 HT |
55 | current->state = TASK_INTERRUPTIBLE; |
56 | schedule(); | |
57 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
58 | return -ERESTARTNOHAND; | |
1da177e4 LT |
59 | } |
60 | ||
61 | asmlinkage int | |
62 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
63 | unsigned long r2, unsigned long r3, unsigned long r4, | |
6ced13cd | 64 | unsigned long r5, unsigned long r6, struct pt_regs *regs) |
1da177e4 | 65 | { |
6ced13cd | 66 | return do_sigaltstack(uss, uoss, regs->spu); |
1da177e4 LT |
67 | } |
68 | ||
69 | ||
70 | /* | |
71 | * Do a signal return; undo the signal stack. | |
72 | */ | |
73 | ||
74 | struct rt_sigframe | |
75 | { | |
76 | int sig; | |
870e75a2 AV |
77 | struct siginfo __user *pinfo; |
78 | void __user *puc; | |
1da177e4 LT |
79 | struct siginfo info; |
80 | struct ucontext uc; | |
81 | // struct _fpstate fpstate; | |
82 | }; | |
83 | ||
84 | static int | |
85 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, | |
86 | int *r0_p) | |
87 | { | |
88 | unsigned int err = 0; | |
89 | ||
90 | /* Always make any pending restarted system calls return -EINTR */ | |
91 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
92 | ||
93 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
94 | COPY(r4); | |
95 | COPY(r5); | |
96 | COPY(r6); | |
97 | COPY(pt_regs); | |
98 | /* COPY(r0); Skip r0 */ | |
99 | COPY(r1); | |
100 | COPY(r2); | |
101 | COPY(r3); | |
102 | COPY(r7); | |
103 | COPY(r8); | |
104 | COPY(r9); | |
105 | COPY(r10); | |
106 | COPY(r11); | |
107 | COPY(r12); | |
1da177e4 LT |
108 | COPY(acc0h); |
109 | COPY(acc0l); | |
9674dcf7 HT |
110 | COPY(acc1h); /* ISA_DSP_LEVEL2 only */ |
111 | COPY(acc1l); /* ISA_DSP_LEVEL2 only */ | |
1da177e4 LT |
112 | COPY(psw); |
113 | COPY(bpc); | |
114 | COPY(bbpsw); | |
115 | COPY(bbpc); | |
116 | COPY(spu); | |
117 | COPY(fp); | |
118 | COPY(lr); | |
119 | COPY(spi); | |
120 | #undef COPY | |
121 | ||
122 | regs->syscall_nr = -1; /* disable syscall checks */ | |
123 | err |= __get_user(*r0_p, &sc->sc_r0); | |
124 | ||
125 | return err; | |
126 | } | |
127 | ||
128 | asmlinkage int | |
129 | sys_rt_sigreturn(unsigned long r0, unsigned long r1, | |
130 | unsigned long r2, unsigned long r3, unsigned long r4, | |
6ced13cd | 131 | unsigned long r5, unsigned long r6, struct pt_regs *regs) |
1da177e4 | 132 | { |
6ced13cd | 133 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu; |
1da177e4 | 134 | sigset_t set; |
1da177e4 LT |
135 | int result; |
136 | ||
137 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
138 | goto badframe; | |
139 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
140 | goto badframe; | |
141 | ||
142 | sigdelsetmask(&set, ~_BLOCKABLE); | |
143 | spin_lock_irq(¤t->sighand->siglock); | |
144 | current->blocked = set; | |
145 | recalc_sigpending(); | |
146 | spin_unlock_irq(¤t->sighand->siglock); | |
147 | ||
6ced13cd | 148 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result)) |
1da177e4 LT |
149 | goto badframe; |
150 | ||
6ced13cd | 151 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT) |
1da177e4 | 152 | goto badframe; |
1da177e4 LT |
153 | |
154 | return result; | |
155 | ||
156 | badframe: | |
157 | force_sig(SIGSEGV, current); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* | |
162 | * Set up a signal frame. | |
163 | */ | |
164 | ||
165 | static int | |
166 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
167 | unsigned long mask) | |
168 | { | |
169 | int err = 0; | |
170 | ||
171 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
172 | COPY(r4); | |
173 | COPY(r5); | |
174 | COPY(r6); | |
175 | COPY(pt_regs); | |
176 | COPY(r0); | |
177 | COPY(r1); | |
178 | COPY(r2); | |
179 | COPY(r3); | |
180 | COPY(r7); | |
181 | COPY(r8); | |
182 | COPY(r9); | |
183 | COPY(r10); | |
184 | COPY(r11); | |
185 | COPY(r12); | |
1da177e4 LT |
186 | COPY(acc0h); |
187 | COPY(acc0l); | |
9674dcf7 HT |
188 | COPY(acc1h); /* ISA_DSP_LEVEL2 only */ |
189 | COPY(acc1l); /* ISA_DSP_LEVEL2 only */ | |
1da177e4 LT |
190 | COPY(psw); |
191 | COPY(bpc); | |
192 | COPY(bbpsw); | |
193 | COPY(bbpc); | |
194 | COPY(spu); | |
195 | COPY(fp); | |
196 | COPY(lr); | |
197 | COPY(spi); | |
198 | #undef COPY | |
199 | ||
200 | err |= __put_user(mask, &sc->oldmask); | |
201 | ||
202 | return err; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Determine which stack to use.. | |
207 | */ | |
208 | static inline void __user * | |
209 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
210 | { | |
211 | /* This is the X/Open sanctioned signal stack switching. */ | |
212 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
213 | if (sas_ss_flags(sp) == 0) | |
214 | sp = current->sas_ss_sp + current->sas_ss_size; | |
215 | } | |
216 | ||
217 | return (void __user *)((sp - frame_size) & -8ul); | |
218 | } | |
219 | ||
220 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
221 | sigset_t *set, struct pt_regs *regs) | |
222 | { | |
223 | struct rt_sigframe __user *frame; | |
224 | int err = 0; | |
225 | int signal; | |
226 | ||
227 | frame = get_sigframe(ka, regs->spu, sizeof(*frame)); | |
228 | ||
229 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
230 | goto give_sigsegv; | |
231 | ||
232 | signal = current_thread_info()->exec_domain | |
233 | && current_thread_info()->exec_domain->signal_invmap | |
234 | && sig < 32 | |
235 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
236 | : sig; | |
237 | ||
238 | err |= __put_user(signal, &frame->sig); | |
239 | if (err) | |
240 | goto give_sigsegv; | |
241 | ||
242 | err |= __put_user(&frame->info, &frame->pinfo); | |
243 | err |= __put_user(&frame->uc, &frame->puc); | |
244 | err |= copy_siginfo_to_user(&frame->info, info); | |
245 | if (err) | |
246 | goto give_sigsegv; | |
247 | ||
248 | /* Create the ucontext. */ | |
249 | err |= __put_user(0, &frame->uc.uc_flags); | |
250 | err |= __put_user(0, &frame->uc.uc_link); | |
251 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
252 | err |= __put_user(sas_ss_flags(regs->spu), | |
253 | &frame->uc.uc_stack.ss_flags); | |
254 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
255 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); | |
256 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
257 | if (err) | |
258 | goto give_sigsegv; | |
259 | ||
260 | /* Set up to return from userspace. */ | |
261 | regs->lr = (unsigned long)ka->sa.sa_restorer; | |
262 | ||
263 | /* Set up registers for signal handler */ | |
264 | regs->spu = (unsigned long)frame; | |
265 | regs->r0 = signal; /* Arg for signal handler */ | |
266 | regs->r1 = (unsigned long)&frame->info; | |
267 | regs->r2 = (unsigned long)&frame->uc; | |
268 | regs->bpc = (unsigned long)ka->sa.sa_handler; | |
269 | ||
270 | set_fs(USER_DS); | |
271 | ||
272 | #if DEBUG_SIG | |
273 | printk("SIG deliver (%s:%d): sp=%p pc=%p\n", | |
274 | current->comm, current->pid, frame, regs->pc); | |
275 | #endif | |
276 | ||
277 | return; | |
278 | ||
279 | give_sigsegv: | |
280 | force_sigsegv(sig, current); | |
281 | } | |
282 | ||
283 | /* | |
284 | * OK, we're invoking a handler | |
285 | */ | |
286 | ||
287 | static void | |
288 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, | |
289 | sigset_t *oldset, struct pt_regs *regs) | |
290 | { | |
291 | unsigned short inst; | |
292 | ||
293 | /* Are we from a system call? */ | |
294 | if (regs->syscall_nr >= 0) { | |
295 | /* If so, check system call restarting.. */ | |
296 | switch (regs->r0) { | |
297 | case -ERESTART_RESTARTBLOCK: | |
298 | case -ERESTARTNOHAND: | |
299 | regs->r0 = -EINTR; | |
300 | break; | |
301 | ||
302 | case -ERESTARTSYS: | |
303 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
304 | regs->r0 = -EINTR; | |
305 | break; | |
306 | } | |
307 | /* fallthrough */ | |
308 | case -ERESTARTNOINTR: | |
309 | regs->r0 = regs->orig_r0; | |
310 | inst = *(unsigned short *)(regs->bpc - 2); | |
311 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
312 | regs->bpc -= 2; | |
313 | else | |
314 | regs->bpc -= 4; | |
315 | } | |
316 | } | |
317 | ||
318 | /* Set up the stack frame */ | |
319 | setup_rt_frame(sig, ka, info, oldset, regs); | |
320 | ||
69be8f18 SR |
321 | spin_lock_irq(¤t->sighand->siglock); |
322 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
323 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 324 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
325 | recalc_sigpending(); |
326 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
327 | } |
328 | ||
329 | /* | |
330 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
331 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
332 | * mistake. | |
333 | */ | |
334 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
335 | { | |
336 | siginfo_t info; | |
337 | int signr; | |
338 | struct k_sigaction ka; | |
339 | unsigned short inst; | |
340 | ||
341 | /* | |
342 | * We want the common case to go fast, which | |
343 | * is why we may in certain cases get here from | |
344 | * kernel mode. Just return without doing anything | |
345 | * if so. | |
346 | */ | |
347 | if (!user_mode(regs)) | |
348 | return 1; | |
349 | ||
3e1d1d28 | 350 | if (try_to_freeze()) |
1da177e4 | 351 | goto no_signal; |
1da177e4 LT |
352 | |
353 | if (!oldset) | |
354 | oldset = ¤t->blocked; | |
355 | ||
356 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
357 | if (signr > 0) { | |
5aa8b6c1 | 358 | /* Re-enable any watchpoints before delivering the |
1da177e4 LT |
359 | * signal to user space. The processor register will |
360 | * have been cleared if the watchpoint triggered | |
361 | * inside the kernel. | |
362 | */ | |
363 | ||
364 | /* Whee! Actually deliver the signal. */ | |
365 | handle_signal(signr, &ka, &info, oldset, regs); | |
366 | return 1; | |
367 | } | |
368 | ||
369 | no_signal: | |
370 | /* Did we come from a system call? */ | |
371 | if (regs->syscall_nr >= 0) { | |
372 | /* Restart the system call - no handlers present */ | |
373 | if (regs->r0 == -ERESTARTNOHAND || | |
374 | regs->r0 == -ERESTARTSYS || | |
375 | regs->r0 == -ERESTARTNOINTR) { | |
376 | regs->r0 = regs->orig_r0; | |
377 | inst = *(unsigned short *)(regs->bpc - 2); | |
378 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
379 | regs->bpc -= 2; | |
380 | else | |
381 | regs->bpc -= 4; | |
382 | } | |
383 | if (regs->r0 == -ERESTART_RESTARTBLOCK){ | |
384 | regs->r0 = regs->orig_r0; | |
385 | regs->r7 = __NR_restart_syscall; | |
386 | inst = *(unsigned short *)(regs->bpc - 2); | |
387 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
388 | regs->bpc -= 2; | |
389 | else | |
390 | regs->bpc -= 4; | |
391 | } | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /* | |
397 | * notification of userspace execution resumption | |
398 | * - triggered by current->work.notify_resume | |
399 | */ | |
400 | void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, | |
401 | __u32 thread_info_flags) | |
402 | { | |
403 | /* Pending single-step? */ | |
404 | if (thread_info_flags & _TIF_SINGLESTEP) | |
405 | clear_thread_flag(TIF_SINGLESTEP); | |
406 | ||
407 | /* deal with pending signal delivery */ | |
408 | if (thread_info_flags & _TIF_SIGPENDING) | |
409 | do_signal(regs,oldset); | |
410 | ||
411 | clear_thread_flag(TIF_IRET); | |
412 | } |