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Linux/arch/alpha/kernel/signal.c

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  1 /*
  2  *  linux/arch/alpha/kernel/signal.c
  3  *
  4  *  Copyright (C) 1995  Linus Torvalds
  5  *
  6  *  1997-11-02  Modified for POSIX.1b signals by Richard Henderson
  7  */
  8 
  9 #include <linux/sched.h>
 10 #include <linux/kernel.h>
 11 #include <linux/signal.h>
 12 #include <linux/errno.h>
 13 #include <linux/wait.h>
 14 #include <linux/ptrace.h>
 15 #include <linux/unistd.h>
 16 #include <linux/mm.h>
 17 #include <linux/smp.h>
 18 #include <linux/stddef.h>
 19 #include <linux/tty.h>
 20 #include <linux/binfmts.h>
 21 #include <linux/bitops.h>
 22 #include <linux/syscalls.h>
 23 #include <linux/tracehook.h>
 24 
 25 #include <asm/uaccess.h>
 26 #include <asm/sigcontext.h>
 27 #include <asm/ucontext.h>
 28 
 29 #include "proto.h"
 30 
 31 
 32 #define DEBUG_SIG 0
 33 
 34 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 35 
 36 asmlinkage void ret_from_sys_call(void);
 37 
 38 /*
 39  * The OSF/1 sigprocmask calling sequence is different from the
 40  * C sigprocmask() sequence..
 41  */
 42 SYSCALL_DEFINE2(osf_sigprocmask, int, how, unsigned long, newmask)
 43 {
 44         sigset_t oldmask;
 45         sigset_t mask;
 46         unsigned long res;
 47 
 48         siginitset(&mask, newmask & _BLOCKABLE);
 49         res = sigprocmask(how, &mask, &oldmask);
 50         if (!res) {
 51                 force_successful_syscall_return();
 52                 res = oldmask.sig[0];
 53         }
 54         return res;
 55 }
 56 
 57 SYSCALL_DEFINE3(osf_sigaction, int, sig,
 58                 const struct osf_sigaction __user *, act,
 59                 struct osf_sigaction __user *, oact)
 60 {
 61         struct k_sigaction new_ka, old_ka;
 62         int ret;
 63 
 64         if (act) {
 65                 old_sigset_t mask;
 66                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 67                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 68                     __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
 69                     __get_user(mask, &act->sa_mask))
 70                         return -EFAULT;
 71                 siginitset(&new_ka.sa.sa_mask, mask);
 72                 new_ka.ka_restorer = NULL;
 73         }
 74 
 75         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 76 
 77         if (!ret && oact) {
 78                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 79                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 80                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
 81                     __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
 82                         return -EFAULT;
 83         }
 84 
 85         return ret;
 86 }
 87 
 88 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 89                 struct sigaction __user *, oact,
 90                 size_t, sigsetsize, void __user *, restorer)
 91 {
 92         struct k_sigaction new_ka, old_ka;
 93         int ret;
 94 
 95         /* XXX: Don't preclude handling different sized sigset_t's.  */
 96         if (sigsetsize != sizeof(sigset_t))
 97                 return -EINVAL;
 98 
 99         if (act) {
100                 new_ka.ka_restorer = restorer;
101                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
102                         return -EFAULT;
103         }
104 
105         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
106 
107         if (!ret && oact) {
108                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
109                         return -EFAULT;
110         }
111 
112         return ret;
113 }
114 
115 /*
116  * Do a signal return; undo the signal stack.
117  */
118 
119 #if _NSIG_WORDS > 1
120 # error "Non SA_SIGINFO frame needs rearranging"
121 #endif
122 
123 struct sigframe
124 {
125         struct sigcontext sc;
126         unsigned int retcode[3];
127 };
128 
129 struct rt_sigframe
130 {
131         struct siginfo info;
132         struct ucontext uc;
133         unsigned int retcode[3];
134 };
135 
136 /* If this changes, userland unwinders that Know Things about our signal
137    frame will break.  Do not undertake lightly.  It also implies an ABI
138    change wrt the size of siginfo_t, which may cause some pain.  */
139 extern char compile_time_assert
140         [offsetof(struct rt_sigframe, uc.uc_mcontext) == 176 ? 1 : -1];
141 
142 #define INSN_MOV_R30_R16        0x47fe0410
143 #define INSN_LDI_R0             0x201f0000
144 #define INSN_CALLSYS            0x00000083
145 
146 static long
147 restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
148 {
149         unsigned long usp;
150         struct switch_stack *sw = (struct switch_stack *)regs - 1;
151         long i, err = __get_user(regs->pc, &sc->sc_pc);
152 
153         current_thread_info()->restart_block.fn = do_no_restart_syscall;
154 
155         sw->r26 = (unsigned long) ret_from_sys_call;
156 
157         err |= __get_user(regs->r0, sc->sc_regs+0);
158         err |= __get_user(regs->r1, sc->sc_regs+1);
159         err |= __get_user(regs->r2, sc->sc_regs+2);
160         err |= __get_user(regs->r3, sc->sc_regs+3);
161         err |= __get_user(regs->r4, sc->sc_regs+4);
162         err |= __get_user(regs->r5, sc->sc_regs+5);
163         err |= __get_user(regs->r6, sc->sc_regs+6);
164         err |= __get_user(regs->r7, sc->sc_regs+7);
165         err |= __get_user(regs->r8, sc->sc_regs+8);
166         err |= __get_user(sw->r9, sc->sc_regs+9);
167         err |= __get_user(sw->r10, sc->sc_regs+10);
168         err |= __get_user(sw->r11, sc->sc_regs+11);
169         err |= __get_user(sw->r12, sc->sc_regs+12);
170         err |= __get_user(sw->r13, sc->sc_regs+13);
171         err |= __get_user(sw->r14, sc->sc_regs+14);
172         err |= __get_user(sw->r15, sc->sc_regs+15);
173         err |= __get_user(regs->r16, sc->sc_regs+16);
174         err |= __get_user(regs->r17, sc->sc_regs+17);
175         err |= __get_user(regs->r18, sc->sc_regs+18);
176         err |= __get_user(regs->r19, sc->sc_regs+19);
177         err |= __get_user(regs->r20, sc->sc_regs+20);
178         err |= __get_user(regs->r21, sc->sc_regs+21);
179         err |= __get_user(regs->r22, sc->sc_regs+22);
180         err |= __get_user(regs->r23, sc->sc_regs+23);
181         err |= __get_user(regs->r24, sc->sc_regs+24);
182         err |= __get_user(regs->r25, sc->sc_regs+25);
183         err |= __get_user(regs->r26, sc->sc_regs+26);
184         err |= __get_user(regs->r27, sc->sc_regs+27);
185         err |= __get_user(regs->r28, sc->sc_regs+28);
186         err |= __get_user(regs->gp, sc->sc_regs+29);
187         err |= __get_user(usp, sc->sc_regs+30);
188         wrusp(usp);
189 
190         for (i = 0; i < 31; i++)
191                 err |= __get_user(sw->fp[i], sc->sc_fpregs+i);
192         err |= __get_user(sw->fp[31], &sc->sc_fpcr);
193 
194         return err;
195 }
196 
197 /* Note that this syscall is also used by setcontext(3) to install
198    a given sigcontext.  This because it's impossible to set *all*
199    registers and transfer control from userland.  */
200 
201 asmlinkage void
202 do_sigreturn(struct sigcontext __user *sc)
203 {
204         struct pt_regs *regs = current_pt_regs();
205         sigset_t set;
206 
207         /* Verify that it's a good sigcontext before using it */
208         if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
209                 goto give_sigsegv;
210         if (__get_user(set.sig[0], &sc->sc_mask))
211                 goto give_sigsegv;
212 
213         set_current_blocked(&set);
214 
215         if (restore_sigcontext(sc, regs))
216                 goto give_sigsegv;
217 
218         /* Send SIGTRAP if we're single-stepping: */
219         if (ptrace_cancel_bpt (current)) {
220                 siginfo_t info;
221 
222                 info.si_signo = SIGTRAP;
223                 info.si_errno = 0;
224                 info.si_code = TRAP_BRKPT;
225                 info.si_addr = (void __user *) regs->pc;
226                 info.si_trapno = 0;
227                 send_sig_info(SIGTRAP, &info, current);
228         }
229         return;
230 
231 give_sigsegv:
232         force_sig(SIGSEGV, current);
233 }
234 
235 asmlinkage void
236 do_rt_sigreturn(struct rt_sigframe __user *frame)
237 {
238         struct pt_regs *regs = current_pt_regs();
239         sigset_t set;
240 
241         /* Verify that it's a good ucontext_t before using it */
242         if (!access_ok(VERIFY_READ, &frame->uc, sizeof(frame->uc)))
243                 goto give_sigsegv;
244         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
245                 goto give_sigsegv;
246 
247         set_current_blocked(&set);
248 
249         if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
250                 goto give_sigsegv;
251 
252         /* Send SIGTRAP if we're single-stepping: */
253         if (ptrace_cancel_bpt (current)) {
254                 siginfo_t info;
255 
256                 info.si_signo = SIGTRAP;
257                 info.si_errno = 0;
258                 info.si_code = TRAP_BRKPT;
259                 info.si_addr = (void __user *) regs->pc;
260                 info.si_trapno = 0;
261                 send_sig_info(SIGTRAP, &info, current);
262         }
263         return;
264 
265 give_sigsegv:
266         force_sig(SIGSEGV, current);
267 }
268 
269 
270 /*
271  * Set up a signal frame.
272  */
273 
274 static inline void __user *
275 get_sigframe(struct ksignal *ksig, unsigned long sp, size_t frame_size)
276 {
277         return (void __user *)((sigsp(sp, ksig) - frame_size) & -32ul);
278 }
279 
280 static long
281 setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, 
282                  unsigned long mask, unsigned long sp)
283 {
284         struct switch_stack *sw = (struct switch_stack *)regs - 1;
285         long i, err = 0;
286 
287         err |= __put_user(on_sig_stack((unsigned long)sc), &sc->sc_onstack);
288         err |= __put_user(mask, &sc->sc_mask);
289         err |= __put_user(regs->pc, &sc->sc_pc);
290         err |= __put_user(8, &sc->sc_ps);
291 
292         err |= __put_user(regs->r0 , sc->sc_regs+0);
293         err |= __put_user(regs->r1 , sc->sc_regs+1);
294         err |= __put_user(regs->r2 , sc->sc_regs+2);
295         err |= __put_user(regs->r3 , sc->sc_regs+3);
296         err |= __put_user(regs->r4 , sc->sc_regs+4);
297         err |= __put_user(regs->r5 , sc->sc_regs+5);
298         err |= __put_user(regs->r6 , sc->sc_regs+6);
299         err |= __put_user(regs->r7 , sc->sc_regs+7);
300         err |= __put_user(regs->r8 , sc->sc_regs+8);
301         err |= __put_user(sw->r9   , sc->sc_regs+9);
302         err |= __put_user(sw->r10  , sc->sc_regs+10);
303         err |= __put_user(sw->r11  , sc->sc_regs+11);
304         err |= __put_user(sw->r12  , sc->sc_regs+12);
305         err |= __put_user(sw->r13  , sc->sc_regs+13);
306         err |= __put_user(sw->r14  , sc->sc_regs+14);
307         err |= __put_user(sw->r15  , sc->sc_regs+15);
308         err |= __put_user(regs->r16, sc->sc_regs+16);
309         err |= __put_user(regs->r17, sc->sc_regs+17);
310         err |= __put_user(regs->r18, sc->sc_regs+18);
311         err |= __put_user(regs->r19, sc->sc_regs+19);
312         err |= __put_user(regs->r20, sc->sc_regs+20);
313         err |= __put_user(regs->r21, sc->sc_regs+21);
314         err |= __put_user(regs->r22, sc->sc_regs+22);
315         err |= __put_user(regs->r23, sc->sc_regs+23);
316         err |= __put_user(regs->r24, sc->sc_regs+24);
317         err |= __put_user(regs->r25, sc->sc_regs+25);
318         err |= __put_user(regs->r26, sc->sc_regs+26);
319         err |= __put_user(regs->r27, sc->sc_regs+27);
320         err |= __put_user(regs->r28, sc->sc_regs+28);
321         err |= __put_user(regs->gp , sc->sc_regs+29);
322         err |= __put_user(sp, sc->sc_regs+30);
323         err |= __put_user(0, sc->sc_regs+31);
324 
325         for (i = 0; i < 31; i++)
326                 err |= __put_user(sw->fp[i], sc->sc_fpregs+i);
327         err |= __put_user(0, sc->sc_fpregs+31);
328         err |= __put_user(sw->fp[31], &sc->sc_fpcr);
329 
330         err |= __put_user(regs->trap_a0, &sc->sc_traparg_a0);
331         err |= __put_user(regs->trap_a1, &sc->sc_traparg_a1);
332         err |= __put_user(regs->trap_a2, &sc->sc_traparg_a2);
333 
334         return err;
335 }
336 
337 static int
338 setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
339 {
340         unsigned long oldsp, r26, err = 0;
341         struct sigframe __user *frame;
342 
343         oldsp = rdusp();
344         frame = get_sigframe(ksig, oldsp, sizeof(*frame));
345         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
346                 return -EFAULT;
347 
348         err |= setup_sigcontext(&frame->sc, regs, set->sig[0], oldsp);
349         if (err)
350                 return -EFAULT;
351 
352         /* Set up to return from userspace.  If provided, use a stub
353            already in userspace.  */
354         r26 = (unsigned long) ksig->ka.ka_restorer;
355         if (!r26) {
356                 err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
357                 err |= __put_user(INSN_LDI_R0+__NR_sigreturn, frame->retcode+1);
358                 err |= __put_user(INSN_CALLSYS, frame->retcode+2);
359                 imb();
360                 r26 = (unsigned long) frame->retcode;
361         }
362 
363         /* Check that everything was written properly.  */
364         if (err)
365                 return err;
366 
367         /* "Return" to the handler */
368         regs->r26 = r26;
369         regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
370         regs->r16 = ksig->sig;                  /* a0: signal number */
371         regs->r17 = 0;                          /* a1: exception code */
372         regs->r18 = (unsigned long) &frame->sc; /* a2: sigcontext pointer */
373         wrusp((unsigned long) frame);
374         
375 #if DEBUG_SIG
376         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
377                 current->comm, current->pid, frame, regs->pc, regs->r26);
378 #endif
379         return 0;
380 }
381 
382 static int
383 setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs)
384 {
385         unsigned long oldsp, r26, err = 0;
386         struct rt_sigframe __user *frame;
387 
388         oldsp = rdusp();
389         frame = get_sigframe(ksig, oldsp, sizeof(*frame));
390         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
391                 return -EFAULT;
392 
393         err |= copy_siginfo_to_user(&frame->info, &ksig->info);
394 
395         /* Create the ucontext.  */
396         err |= __put_user(0, &frame->uc.uc_flags);
397         err |= __put_user(0, &frame->uc.uc_link);
398         err |= __put_user(set->sig[0], &frame->uc.uc_osf_sigmask);
399         err |= __save_altstack(&frame->uc.uc_stack, oldsp);
400         err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, 
401                                 set->sig[0], oldsp);
402         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
403         if (err)
404                 return -EFAULT;
405 
406         /* Set up to return from userspace.  If provided, use a stub
407            already in userspace.  */
408         r26 = (unsigned long) ksig->ka.ka_restorer;
409         if (!r26) {
410                 err |= __put_user(INSN_MOV_R30_R16, frame->retcode+0);
411                 err |= __put_user(INSN_LDI_R0+__NR_rt_sigreturn,
412                                   frame->retcode+1);
413                 err |= __put_user(INSN_CALLSYS, frame->retcode+2);
414                 imb();
415                 r26 = (unsigned long) frame->retcode;
416         }
417 
418         if (err)
419                 return -EFAULT;
420 
421         /* "Return" to the handler */
422         regs->r26 = r26;
423         regs->r27 = regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
424         regs->r16 = ksig->sig;                    /* a0: signal number */
425         regs->r17 = (unsigned long) &frame->info; /* a1: siginfo pointer */
426         regs->r18 = (unsigned long) &frame->uc;   /* a2: ucontext pointer */
427         wrusp((unsigned long) frame);
428 
429 #if DEBUG_SIG
430         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
431                 current->comm, current->pid, frame, regs->pc, regs->r26);
432 #endif
433 
434         return 0;
435 }
436 
437 
438 /*
439  * OK, we're invoking a handler.
440  */
441 static inline void
442 handle_signal(struct ksignal *ksig, struct pt_regs *regs)
443 {
444         sigset_t *oldset = sigmask_to_save();
445         int ret;
446 
447         if (ksig->ka.sa.sa_flags & SA_SIGINFO)
448                 ret = setup_rt_frame(ksig, oldset, regs);
449         else
450                 ret = setup_frame(ksig, oldset, regs);
451 
452         signal_setup_done(ret, ksig, 0);
453 }
454 
455 static inline void
456 syscall_restart(unsigned long r0, unsigned long r19,
457                 struct pt_regs *regs, struct k_sigaction *ka)
458 {
459         switch (regs->r0) {
460         case ERESTARTSYS:
461                 if (!(ka->sa.sa_flags & SA_RESTART)) {
462                 case ERESTARTNOHAND:
463                         regs->r0 = EINTR;
464                         break;
465                 }
466                 /* fallthrough */
467         case ERESTARTNOINTR:
468                 regs->r0 = r0;  /* reset v0 and a3 and replay syscall */
469                 regs->r19 = r19;
470                 regs->pc -= 4;
471                 break;
472         case ERESTART_RESTARTBLOCK:
473                 regs->r0 = EINTR;
474                 break;
475         }
476 }
477 
478 
479 /*
480  * Note that 'init' is a special process: it doesn't get signals it doesn't
481  * want to handle. Thus you cannot kill init even with a SIGKILL even by
482  * mistake.
483  *
484  * Note that we go through the signals twice: once to check the signals that
485  * the kernel can handle, and then we build all the user-level signal handling
486  * stack-frames in one go after that.
487  *
488  * "r0" and "r19" are the registers we need to restore for system call
489  * restart. "r0" is also used as an indicator whether we can restart at
490  * all (if we get here from anything but a syscall return, it will be 0)
491  */
492 static void
493 do_signal(struct pt_regs *regs, unsigned long r0, unsigned long r19)
494 {
495         unsigned long single_stepping = ptrace_cancel_bpt(current);
496         struct ksignal ksig;
497 
498         /* This lets the debugger run, ... */
499         if (get_signal(&ksig)) {
500                 /* ... so re-check the single stepping. */
501                 single_stepping |= ptrace_cancel_bpt(current);
502                 /* Whee!  Actually deliver the signal.  */
503                 if (r0)
504                         syscall_restart(r0, r19, regs, &ksig.ka);
505                 handle_signal(&ksig, regs);
506         } else {
507                 single_stepping |= ptrace_cancel_bpt(current);
508                 if (r0) {
509                         switch (regs->r0) {
510                         case ERESTARTNOHAND:
511                         case ERESTARTSYS:
512                         case ERESTARTNOINTR:
513                                 /* Reset v0 and a3 and replay syscall.  */
514                                 regs->r0 = r0;
515                                 regs->r19 = r19;
516                                 regs->pc -= 4;
517                                 break;
518                         case ERESTART_RESTARTBLOCK:
519                                 /* Set v0 to the restart_syscall and replay */
520                                 regs->r0 = __NR_restart_syscall;
521                                 regs->pc -= 4;
522                                 break;
523                         }
524                 }
525                 restore_saved_sigmask();
526         }
527         if (single_stepping)
528                 ptrace_set_bpt(current);        /* re-set breakpoint */
529 }
530 
531 void
532 do_work_pending(struct pt_regs *regs, unsigned long thread_flags,
533                  unsigned long r0, unsigned long r19)
534 {
535         do {
536                 if (thread_flags & _TIF_NEED_RESCHED) {
537                         schedule();
538                 } else {
539                         local_irq_enable();
540                         if (thread_flags & _TIF_SIGPENDING) {
541                                 do_signal(regs, r0, r19);
542                                 r0 = 0;
543                         } else {
544                                 clear_thread_flag(TIF_NOTIFY_RESUME);
545                                 tracehook_notify_resume(regs);
546                         }
547                 }
548                 local_irq_disable();
549                 thread_flags = current_thread_info()->flags;
550         } while (thread_flags & _TIF_WORK_MASK);
551 }
552 

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