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Linux/arch/mn10300/kernel/signal.c

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  1 /* MN10300 Signal handling
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/sched.h>
 13 #include <linux/mm.h>
 14 #include <linux/smp.h>
 15 #include <linux/kernel.h>
 16 #include <linux/signal.h>
 17 #include <linux/errno.h>
 18 #include <linux/wait.h>
 19 #include <linux/ptrace.h>
 20 #include <linux/unistd.h>
 21 #include <linux/stddef.h>
 22 #include <linux/tty.h>
 23 #include <linux/personality.h>
 24 #include <linux/suspend.h>
 25 #include <linux/tracehook.h>
 26 #include <asm/cacheflush.h>
 27 #include <asm/ucontext.h>
 28 #include <asm/uaccess.h>
 29 #include <asm/fpu.h>
 30 #include "sigframe.h"
 31 
 32 #define DEBUG_SIG 0
 33 
 34 /*
 35  * do a signal return; undo the signal stack.
 36  */
 37 static int restore_sigcontext(struct pt_regs *regs,
 38                               struct sigcontext __user *sc, long *_d0)
 39 {
 40         unsigned int err = 0;
 41 
 42         /* Always make any pending restarted system calls return -EINTR */
 43         current->restart_block.fn = do_no_restart_syscall;
 44 
 45         if (is_using_fpu(current))
 46                 fpu_kill_state(current);
 47 
 48 #define COPY(x) err |= __get_user(regs->x, &sc->x)
 49         COPY(d1); COPY(d2); COPY(d3);
 50         COPY(a0); COPY(a1); COPY(a2); COPY(a3);
 51         COPY(e0); COPY(e1); COPY(e2); COPY(e3);
 52         COPY(e4); COPY(e5); COPY(e6); COPY(e7);
 53         COPY(lar); COPY(lir);
 54         COPY(mdr); COPY(mdrq);
 55         COPY(mcvf); COPY(mcrl); COPY(mcrh);
 56         COPY(sp); COPY(pc);
 57 #undef COPY
 58 
 59         {
 60                 unsigned int tmpflags;
 61 #ifndef CONFIG_MN10300_USING_JTAG
 62 #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
 63                    EPSW_T | EPSW_nAR)
 64 #else
 65 #define USER_EPSW (EPSW_FLAG_Z | EPSW_FLAG_N | EPSW_FLAG_C | EPSW_FLAG_V | \
 66                    EPSW_nAR)
 67 #endif
 68                 err |= __get_user(tmpflags, &sc->epsw);
 69                 regs->epsw = (regs->epsw & ~USER_EPSW) |
 70                   (tmpflags & USER_EPSW);
 71                 regs->orig_d0 = -1;             /* disable syscall checks */
 72         }
 73 
 74         {
 75                 struct fpucontext *buf;
 76                 err |= __get_user(buf, &sc->fpucontext);
 77                 if (buf) {
 78                         if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
 79                                 goto badframe;
 80                         err |= fpu_restore_sigcontext(buf);
 81                 }
 82         }
 83 
 84         err |= __get_user(*_d0, &sc->d0);
 85         return err;
 86 
 87 badframe:
 88         return 1;
 89 }
 90 
 91 /*
 92  * standard signal return syscall
 93  */
 94 asmlinkage long sys_sigreturn(void)
 95 {
 96         struct sigframe __user *frame;
 97         sigset_t set;
 98         long d0;
 99 
100         frame = (struct sigframe __user *) current_frame()->sp;
101         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
102                 goto badframe;
103         if (__get_user(set.sig[0], &frame->sc.oldmask))
104                 goto badframe;
105 
106         if (_NSIG_WORDS > 1 &&
107             __copy_from_user(&set.sig[1], &frame->extramask,
108                              sizeof(frame->extramask)))
109                 goto badframe;
110 
111         set_current_blocked(&set);
112 
113         if (restore_sigcontext(current_frame(), &frame->sc, &d0))
114                 goto badframe;
115 
116         return d0;
117 
118 badframe:
119         force_sig(SIGSEGV, current);
120         return 0;
121 }
122 
123 /*
124  * realtime signal return syscall
125  */
126 asmlinkage long sys_rt_sigreturn(void)
127 {
128         struct rt_sigframe __user *frame;
129         sigset_t set;
130         long d0;
131 
132         frame = (struct rt_sigframe __user *) current_frame()->sp;
133         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
134                 goto badframe;
135         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
136                 goto badframe;
137 
138         set_current_blocked(&set);
139 
140         if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
141                 goto badframe;
142 
143         if (restore_altstack(&frame->uc.uc_stack))
144                 goto badframe;
145 
146         return d0;
147 
148 badframe:
149         force_sig(SIGSEGV, current);
150         return 0;
151 }
152 
153 /*
154  * store the userspace context into a signal frame
155  */
156 static int setup_sigcontext(struct sigcontext __user *sc,
157                             struct fpucontext *fpuctx,
158                             struct pt_regs *regs,
159                             unsigned long mask)
160 {
161         int tmp, err = 0;
162 
163 #define COPY(x) err |= __put_user(regs->x, &sc->x)
164         COPY(d0); COPY(d1); COPY(d2); COPY(d3);
165         COPY(a0); COPY(a1); COPY(a2); COPY(a3);
166         COPY(e0); COPY(e1); COPY(e2); COPY(e3);
167         COPY(e4); COPY(e5); COPY(e6); COPY(e7);
168         COPY(lar); COPY(lir);
169         COPY(mdr); COPY(mdrq);
170         COPY(mcvf); COPY(mcrl); COPY(mcrh);
171         COPY(sp); COPY(epsw); COPY(pc);
172 #undef COPY
173 
174         tmp = fpu_setup_sigcontext(fpuctx);
175         if (tmp < 0)
176                 err = 1;
177         else
178                 err |= __put_user(tmp ? fpuctx : NULL, &sc->fpucontext);
179 
180         /* non-iBCS2 extensions.. */
181         err |= __put_user(mask, &sc->oldmask);
182 
183         return err;
184 }
185 
186 /*
187  * determine which stack to use..
188  */
189 static inline void __user *get_sigframe(struct ksignal *ksig,
190                                         struct pt_regs *regs,
191                                         size_t frame_size)
192 {
193         unsigned long sp = sigsp(regs->sp, ksig);
194 
195         return (void __user *) ((sp - frame_size) & ~7UL);
196 }
197 
198 /*
199  * set up a normal signal frame
200  */
201 static int setup_frame(struct ksignal *ksig, sigset_t *set,
202                        struct pt_regs *regs)
203 {
204         struct sigframe __user *frame;
205         int sig = ksig->sig;
206 
207         frame = get_sigframe(ksig, regs, sizeof(*frame));
208 
209         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
210                 return -EFAULT;
211 
212         if (__put_user(sig, &frame->sig) < 0 ||
213             __put_user(&frame->sc, &frame->psc) < 0)
214                 return -EFAULT;
215 
216         if (setup_sigcontext(&frame->sc, &frame->fpuctx, regs, set->sig[0]))
217                 return -EFAULT;
218 
219         if (_NSIG_WORDS > 1) {
220                 if (__copy_to_user(frame->extramask, &set->sig[1],
221                                    sizeof(frame->extramask)))
222                         return -EFAULT;
223         }
224 
225         /* set up to return from userspace.  If provided, use a stub already in
226          * userspace */
227         if (ksig->ka.sa.sa_flags & SA_RESTORER) {
228                 if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode))
229                         return -EFAULT;
230         } else {
231                 if (__put_user((void (*)(void))frame->retcode,
232                                &frame->pretcode))
233                         return -EFAULT;
234                 /* this is mov $,d0; syscall 0 */
235                 if (__put_user(0x2c, (char *)(frame->retcode + 0)) ||
236                     __put_user(__NR_sigreturn, (char *)(frame->retcode + 1)) ||
237                     __put_user(0x00, (char *)(frame->retcode + 2)) ||
238                     __put_user(0xf0, (char *)(frame->retcode + 3)) ||
239                     __put_user(0xe0, (char *)(frame->retcode + 4)))
240                         return -EFAULT;
241                 flush_icache_range((unsigned long) frame->retcode,
242                                    (unsigned long) frame->retcode + 5);
243         }
244 
245         /* set up registers for signal handler */
246         regs->sp = (unsigned long) frame;
247         regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
248         regs->d0 = sig;
249         regs->d1 = (unsigned long) &frame->sc;
250 
251 #if DEBUG_SIG
252         printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
253                sig, current->comm, current->pid, frame, regs->pc,
254                frame->pretcode);
255 #endif
256 
257         return 0;
258 }
259 
260 /*
261  * set up a realtime signal frame
262  */
263 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
264                           struct pt_regs *regs)
265 {
266         struct rt_sigframe __user *frame;
267         int sig = ksig->sig;
268 
269         frame = get_sigframe(ksig, regs, sizeof(*frame));
270 
271         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
272                 return -EFAULT;
273 
274         if (__put_user(sig, &frame->sig) ||
275             __put_user(&frame->info, &frame->pinfo) ||
276             __put_user(&frame->uc, &frame->puc) ||
277             copy_siginfo_to_user(&frame->info, &ksig->info))
278                 return -EFAULT;
279 
280         /* create the ucontext.  */
281         if (__put_user(0, &frame->uc.uc_flags) ||
282             __put_user(0, &frame->uc.uc_link) ||
283             __save_altstack(&frame->uc.uc_stack, regs->sp) ||
284             setup_sigcontext(&frame->uc.uc_mcontext,
285                              &frame->fpuctx, regs, set->sig[0]) ||
286             __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))
287                 return -EFAULT;
288 
289         /* set up to return from userspace.  If provided, use a stub already in
290          * userspace */
291         if (ksig->ka.sa.sa_flags & SA_RESTORER) {
292                 if (__put_user(ksig->ka.sa.sa_restorer, &frame->pretcode))
293                         return -EFAULT;
294 
295         } else {
296                 if (__put_user((void(*)(void))frame->retcode,
297                                &frame->pretcode) ||
298                     /* This is mov $,d0; syscall 0 */
299                     __put_user(0x2c, (char *)(frame->retcode + 0)) ||
300                     __put_user(__NR_rt_sigreturn,
301                                (char *)(frame->retcode + 1)) ||
302                     __put_user(0x00, (char *)(frame->retcode + 2)) ||
303                     __put_user(0xf0, (char *)(frame->retcode + 3)) ||
304                     __put_user(0xe0, (char *)(frame->retcode + 4)))
305                         return -EFAULT;
306 
307                 flush_icache_range((u_long) frame->retcode,
308                                    (u_long) frame->retcode + 5);
309         }
310 
311         /* Set up registers for signal handler */
312         regs->sp = (unsigned long) frame;
313         regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
314         regs->d0 = sig;
315         regs->d1 = (long) &frame->info;
316 
317 #if DEBUG_SIG
318         printk(KERN_DEBUG "SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
319                sig, current->comm, current->pid, frame, regs->pc,
320                frame->pretcode);
321 #endif
322 
323         return 0;
324 }
325 
326 static inline void stepback(struct pt_regs *regs)
327 {
328         regs->pc -= 2;
329         regs->orig_d0 = -1;
330 }
331 
332 /*
333  * handle the actual delivery of a signal to userspace
334  */
335 static int handle_signal(struct ksignal *ksig, struct pt_regs *regs)
336 {
337         sigset_t *oldset = sigmask_to_save();
338         int ret;
339 
340         /* Are we from a system call? */
341         if (regs->orig_d0 >= 0) {
342                 /* If so, check system call restarting.. */
343                 switch (regs->d0) {
344                 case -ERESTART_RESTARTBLOCK:
345                 case -ERESTARTNOHAND:
346                         regs->d0 = -EINTR;
347                         break;
348 
349                 case -ERESTARTSYS:
350                         if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
351                                 regs->d0 = -EINTR;
352                                 break;
353                         }
354 
355                         /* fallthrough */
356                 case -ERESTARTNOINTR:
357                         regs->d0 = regs->orig_d0;
358                         stepback(regs);
359                 }
360         }
361 
362         /* Set up the stack frame */
363         if (ksig->ka.sa.sa_flags & SA_SIGINFO)
364                 ret = setup_rt_frame(ksig, oldset, regs);
365         else
366                 ret = setup_frame(ksig, oldset, regs);
367 
368         signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
369         return 0;
370 }
371 
372 /*
373  * handle a potential signal
374  */
375 static void do_signal(struct pt_regs *regs)
376 {
377         struct ksignal ksig;
378 
379         if (get_signal(&ksig)) {
380                 handle_signal(&ksig, regs);
381                 return;
382         }
383 
384         /* did we come from a system call? */
385         if (regs->orig_d0 >= 0) {
386                 /* restart the system call - no handlers present */
387                 switch (regs->d0) {
388                 case -ERESTARTNOHAND:
389                 case -ERESTARTSYS:
390                 case -ERESTARTNOINTR:
391                         regs->d0 = regs->orig_d0;
392                         stepback(regs);
393                         break;
394 
395                 case -ERESTART_RESTARTBLOCK:
396                         regs->d0 = __NR_restart_syscall;
397                         stepback(regs);
398                         break;
399                 }
400         }
401 
402         /* if there's no signal to deliver, we just put the saved sigmask
403          * back */
404         restore_saved_sigmask();
405 }
406 
407 /*
408  * notification of userspace execution resumption
409  * - triggered by current->work.notify_resume
410  */
411 asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags)
412 {
413         /* Pending single-step? */
414         if (thread_info_flags & _TIF_SINGLESTEP) {
415 #ifndef CONFIG_MN10300_USING_JTAG
416                 regs->epsw |= EPSW_T;
417                 clear_thread_flag(TIF_SINGLESTEP);
418 #else
419                 BUG(); /* no h/w single-step if using JTAG unit */
420 #endif
421         }
422 
423         /* deal with pending signal delivery */
424         if (thread_info_flags & _TIF_SIGPENDING)
425                 do_signal(regs);
426 
427         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
428                 clear_thread_flag(TIF_NOTIFY_RESUME);
429                 tracehook_notify_resume(current_frame());
430         }
431 }
432 

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