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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/signal.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/personality.h> | |
25 | #include <linux/suspend.h> | |
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/ucontext.h> | |
28 | #include <asm/uaccess.h> | |
29 | ||
30 | #define DEBUG_SIG 0 | |
31 | ||
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
33 | ||
34 | int do_signal(struct pt_regs *, sigset_t *); | |
35 | ||
36 | asmlinkage int | |
37 | sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, | |
38 | unsigned long r2, unsigned long r3, unsigned long r4, | |
39 | unsigned long r5, unsigned long r6, struct pt_regs regs) | |
40 | { | |
41 | sigset_t saveset, newset; | |
42 | ||
43 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
44 | if (sigsetsize != sizeof(sigset_t)) | |
45 | return -EINVAL; | |
46 | ||
47 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
48 | return -EFAULT; | |
49 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
50 | ||
51 | spin_lock_irq(¤t->sighand->siglock); | |
52 | saveset = current->blocked; | |
53 | current->blocked = newset; | |
54 | recalc_sigpending(); | |
55 | spin_unlock_irq(¤t->sighand->siglock); | |
56 | ||
57 | regs.r0 = -EINTR; | |
58 | while (1) { | |
59 | current->state = TASK_INTERRUPTIBLE; | |
60 | schedule(); | |
61 | if (do_signal(®s, &saveset)) | |
62 | return regs.r0; | |
63 | } | |
64 | } | |
65 | ||
66 | asmlinkage int | |
67 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
68 | unsigned long r2, unsigned long r3, unsigned long r4, | |
69 | unsigned long r5, unsigned long r6, struct pt_regs regs) | |
70 | { | |
71 | return do_sigaltstack(uss, uoss, regs.spu); | |
72 | } | |
73 | ||
74 | ||
75 | /* | |
76 | * Do a signal return; undo the signal stack. | |
77 | */ | |
78 | ||
79 | struct rt_sigframe | |
80 | { | |
81 | int sig; | |
82 | struct siginfo *pinfo; | |
83 | void *puc; | |
84 | struct siginfo info; | |
85 | struct ucontext uc; | |
86 | // struct _fpstate fpstate; | |
87 | }; | |
88 | ||
89 | static int | |
90 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, | |
91 | int *r0_p) | |
92 | { | |
93 | unsigned int err = 0; | |
94 | ||
95 | /* Always make any pending restarted system calls return -EINTR */ | |
96 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
97 | ||
98 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
99 | COPY(r4); | |
100 | COPY(r5); | |
101 | COPY(r6); | |
102 | COPY(pt_regs); | |
103 | /* COPY(r0); Skip r0 */ | |
104 | COPY(r1); | |
105 | COPY(r2); | |
106 | COPY(r3); | |
107 | COPY(r7); | |
108 | COPY(r8); | |
109 | COPY(r9); | |
110 | COPY(r10); | |
111 | COPY(r11); | |
112 | COPY(r12); | |
113 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
114 | COPY(acc0h); | |
115 | COPY(acc0l); | |
116 | COPY(acc1h); | |
117 | COPY(acc1l); | |
118 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
119 | COPY(acch); | |
120 | COPY(accl); | |
121 | #else | |
122 | #error unknown isa configuration | |
123 | #endif | |
124 | COPY(psw); | |
125 | COPY(bpc); | |
126 | COPY(bbpsw); | |
127 | COPY(bbpc); | |
128 | COPY(spu); | |
129 | COPY(fp); | |
130 | COPY(lr); | |
131 | COPY(spi); | |
132 | #undef COPY | |
133 | ||
134 | regs->syscall_nr = -1; /* disable syscall checks */ | |
135 | err |= __get_user(*r0_p, &sc->sc_r0); | |
136 | ||
137 | return err; | |
138 | } | |
139 | ||
140 | asmlinkage int | |
141 | sys_rt_sigreturn(unsigned long r0, unsigned long r1, | |
142 | unsigned long r2, unsigned long r3, unsigned long r4, | |
143 | unsigned long r5, unsigned long r6, struct pt_regs regs) | |
144 | { | |
145 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.spu; | |
146 | sigset_t set; | |
147 | stack_t st; | |
148 | int result; | |
149 | ||
150 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
151 | goto badframe; | |
152 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
153 | goto badframe; | |
154 | ||
155 | sigdelsetmask(&set, ~_BLOCKABLE); | |
156 | spin_lock_irq(¤t->sighand->siglock); | |
157 | current->blocked = set; | |
158 | recalc_sigpending(); | |
159 | spin_unlock_irq(¤t->sighand->siglock); | |
160 | ||
161 | if (restore_sigcontext(®s, &frame->uc.uc_mcontext, &result)) | |
162 | goto badframe; | |
163 | ||
164 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
165 | goto badframe; | |
166 | /* It is more difficult to avoid calling this function than to | |
167 | call it and ignore errors. */ | |
168 | do_sigaltstack(&st, NULL, regs.spu); | |
169 | ||
170 | return result; | |
171 | ||
172 | badframe: | |
173 | force_sig(SIGSEGV, current); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Set up a signal frame. | |
179 | */ | |
180 | ||
181 | static int | |
182 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
183 | unsigned long mask) | |
184 | { | |
185 | int err = 0; | |
186 | ||
187 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) | |
188 | COPY(r4); | |
189 | COPY(r5); | |
190 | COPY(r6); | |
191 | COPY(pt_regs); | |
192 | COPY(r0); | |
193 | COPY(r1); | |
194 | COPY(r2); | |
195 | COPY(r3); | |
196 | COPY(r7); | |
197 | COPY(r8); | |
198 | COPY(r9); | |
199 | COPY(r10); | |
200 | COPY(r11); | |
201 | COPY(r12); | |
202 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
203 | COPY(acc0h); | |
204 | COPY(acc0l); | |
205 | COPY(acc1h); | |
206 | COPY(acc1l); | |
207 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
208 | COPY(acch); | |
209 | COPY(accl); | |
210 | #else | |
211 | #error unknown isa configuration | |
212 | #endif | |
213 | COPY(psw); | |
214 | COPY(bpc); | |
215 | COPY(bbpsw); | |
216 | COPY(bbpc); | |
217 | COPY(spu); | |
218 | COPY(fp); | |
219 | COPY(lr); | |
220 | COPY(spi); | |
221 | #undef COPY | |
222 | ||
223 | err |= __put_user(mask, &sc->oldmask); | |
224 | ||
225 | return err; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Determine which stack to use.. | |
230 | */ | |
231 | static inline void __user * | |
232 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) | |
233 | { | |
234 | /* This is the X/Open sanctioned signal stack switching. */ | |
235 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
236 | if (sas_ss_flags(sp) == 0) | |
237 | sp = current->sas_ss_sp + current->sas_ss_size; | |
238 | } | |
239 | ||
240 | return (void __user *)((sp - frame_size) & -8ul); | |
241 | } | |
242 | ||
243 | static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
244 | sigset_t *set, struct pt_regs *regs) | |
245 | { | |
246 | struct rt_sigframe __user *frame; | |
247 | int err = 0; | |
248 | int signal; | |
249 | ||
250 | frame = get_sigframe(ka, regs->spu, sizeof(*frame)); | |
251 | ||
252 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
253 | goto give_sigsegv; | |
254 | ||
255 | signal = current_thread_info()->exec_domain | |
256 | && current_thread_info()->exec_domain->signal_invmap | |
257 | && sig < 32 | |
258 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
259 | : sig; | |
260 | ||
261 | err |= __put_user(signal, &frame->sig); | |
262 | if (err) | |
263 | goto give_sigsegv; | |
264 | ||
265 | err |= __put_user(&frame->info, &frame->pinfo); | |
266 | err |= __put_user(&frame->uc, &frame->puc); | |
267 | err |= copy_siginfo_to_user(&frame->info, info); | |
268 | if (err) | |
269 | goto give_sigsegv; | |
270 | ||
271 | /* Create the ucontext. */ | |
272 | err |= __put_user(0, &frame->uc.uc_flags); | |
273 | err |= __put_user(0, &frame->uc.uc_link); | |
274 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
275 | err |= __put_user(sas_ss_flags(regs->spu), | |
276 | &frame->uc.uc_stack.ss_flags); | |
277 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
278 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]); | |
279 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
280 | if (err) | |
281 | goto give_sigsegv; | |
282 | ||
283 | /* Set up to return from userspace. */ | |
284 | regs->lr = (unsigned long)ka->sa.sa_restorer; | |
285 | ||
286 | /* Set up registers for signal handler */ | |
287 | regs->spu = (unsigned long)frame; | |
288 | regs->r0 = signal; /* Arg for signal handler */ | |
289 | regs->r1 = (unsigned long)&frame->info; | |
290 | regs->r2 = (unsigned long)&frame->uc; | |
291 | regs->bpc = (unsigned long)ka->sa.sa_handler; | |
292 | ||
293 | set_fs(USER_DS); | |
294 | ||
295 | #if DEBUG_SIG | |
296 | printk("SIG deliver (%s:%d): sp=%p pc=%p\n", | |
297 | current->comm, current->pid, frame, regs->pc); | |
298 | #endif | |
299 | ||
300 | return; | |
301 | ||
302 | give_sigsegv: | |
303 | force_sigsegv(sig, current); | |
304 | } | |
305 | ||
306 | /* | |
307 | * OK, we're invoking a handler | |
308 | */ | |
309 | ||
310 | static void | |
311 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, | |
312 | sigset_t *oldset, struct pt_regs *regs) | |
313 | { | |
314 | unsigned short inst; | |
315 | ||
316 | /* Are we from a system call? */ | |
317 | if (regs->syscall_nr >= 0) { | |
318 | /* If so, check system call restarting.. */ | |
319 | switch (regs->r0) { | |
320 | case -ERESTART_RESTARTBLOCK: | |
321 | case -ERESTARTNOHAND: | |
322 | regs->r0 = -EINTR; | |
323 | break; | |
324 | ||
325 | case -ERESTARTSYS: | |
326 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
327 | regs->r0 = -EINTR; | |
328 | break; | |
329 | } | |
330 | /* fallthrough */ | |
331 | case -ERESTARTNOINTR: | |
332 | regs->r0 = regs->orig_r0; | |
333 | inst = *(unsigned short *)(regs->bpc - 2); | |
334 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
335 | regs->bpc -= 2; | |
336 | else | |
337 | regs->bpc -= 4; | |
338 | } | |
339 | } | |
340 | ||
341 | /* Set up the stack frame */ | |
342 | setup_rt_frame(sig, ka, info, oldset, regs); | |
343 | ||
69be8f18 SR |
344 | spin_lock_irq(¤t->sighand->siglock); |
345 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
346 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 347 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
348 | recalc_sigpending(); |
349 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
350 | } |
351 | ||
352 | /* | |
353 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
354 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
355 | * mistake. | |
356 | */ | |
357 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
358 | { | |
359 | siginfo_t info; | |
360 | int signr; | |
361 | struct k_sigaction ka; | |
362 | unsigned short inst; | |
363 | ||
364 | /* | |
365 | * We want the common case to go fast, which | |
366 | * is why we may in certain cases get here from | |
367 | * kernel mode. Just return without doing anything | |
368 | * if so. | |
369 | */ | |
370 | if (!user_mode(regs)) | |
371 | return 1; | |
372 | ||
3e1d1d28 | 373 | if (try_to_freeze()) |
1da177e4 | 374 | goto no_signal; |
1da177e4 LT |
375 | |
376 | if (!oldset) | |
377 | oldset = ¤t->blocked; | |
378 | ||
379 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
380 | if (signr > 0) { | |
381 | /* Reenable any watchpoints before delivering the | |
382 | * signal to user space. The processor register will | |
383 | * have been cleared if the watchpoint triggered | |
384 | * inside the kernel. | |
385 | */ | |
386 | ||
387 | /* Whee! Actually deliver the signal. */ | |
388 | handle_signal(signr, &ka, &info, oldset, regs); | |
389 | return 1; | |
390 | } | |
391 | ||
392 | no_signal: | |
393 | /* Did we come from a system call? */ | |
394 | if (regs->syscall_nr >= 0) { | |
395 | /* Restart the system call - no handlers present */ | |
396 | if (regs->r0 == -ERESTARTNOHAND || | |
397 | regs->r0 == -ERESTARTSYS || | |
398 | regs->r0 == -ERESTARTNOINTR) { | |
399 | regs->r0 = regs->orig_r0; | |
400 | inst = *(unsigned short *)(regs->bpc - 2); | |
401 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
402 | regs->bpc -= 2; | |
403 | else | |
404 | regs->bpc -= 4; | |
405 | } | |
406 | if (regs->r0 == -ERESTART_RESTARTBLOCK){ | |
407 | regs->r0 = regs->orig_r0; | |
408 | regs->r7 = __NR_restart_syscall; | |
409 | inst = *(unsigned short *)(regs->bpc - 2); | |
410 | if ((inst & 0xfff0) == 0x10f0) /* trap ? */ | |
411 | regs->bpc -= 2; | |
412 | else | |
413 | regs->bpc -= 4; | |
414 | } | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * notification of userspace execution resumption | |
421 | * - triggered by current->work.notify_resume | |
422 | */ | |
423 | void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, | |
424 | __u32 thread_info_flags) | |
425 | { | |
426 | /* Pending single-step? */ | |
427 | if (thread_info_flags & _TIF_SINGLESTEP) | |
428 | clear_thread_flag(TIF_SINGLESTEP); | |
429 | ||
430 | /* deal with pending signal delivery */ | |
431 | if (thread_info_flags & _TIF_SIGPENDING) | |
432 | do_signal(regs,oldset); | |
433 | ||
434 | clear_thread_flag(TIF_IRET); | |
435 | } |