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-rw-r--r--arch/v850/kernel/signal.c523
1 files changed, 0 insertions, 523 deletions
diff --git a/arch/v850/kernel/signal.c b/arch/v850/kernel/signal.c
deleted file mode 100644
index bf166e7e762c..000000000000
--- a/arch/v850/kernel/signal.c
+++ /dev/null
@@ -1,523 +0,0 @@
1/*
2 * arch/v850/kernel/signal.c -- Signal handling
3 *
4 * Copyright (C) 2001,02,03 NEC Electronics Corporation
5 * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
6 * Copyright (C) 1999,2000,2002 Niibe Yutaka & Kaz Kojima
7 * Copyright (C) 1991,1992 Linus Torvalds
8 *
9 * This file is subject to the terms and conditions of the GNU General
10 * Public License. See the file COPYING in the main directory of this
11 * archive for more details.
12 *
13 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
14 *
15 * This file was derived from the sh version, arch/sh/kernel/signal.c
16 */
17
18#include <linux/mm.h>
19#include <linux/smp.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/personality.h>
28#include <linux/tty.h>
29
30#include <asm/ucontext.h>
31#include <asm/uaccess.h>
32#include <asm/pgtable.h>
33#include <asm/pgalloc.h>
34#include <asm/thread_info.h>
35#include <asm/cacheflush.h>
36
37#define DEBUG_SIG 0
38
39#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
42
43/*
44 * Atomically swap in the new signal mask, and wait for a signal.
45 */
46asmlinkage int
47sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs)
48{
49 sigset_t saveset;
50
51 mask &= _BLOCKABLE;
52 spin_lock_irq(&current->sighand->siglock);
53 saveset = current->blocked;
54 siginitset(&current->blocked, mask);
55 recalc_sigpending();
56 spin_unlock_irq(&current->sighand->siglock);
57
58 regs->gpr[GPR_RVAL] = -EINTR;
59 while (1) {
60 current->state = TASK_INTERRUPTIBLE;
61 schedule();
62 if (do_signal(regs, &saveset))
63 return -EINTR;
64 }
65}
66
67asmlinkage int
68sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
69 struct pt_regs *regs)
70{
71 sigset_t saveset, newset;
72
73 /* XXX: Don't preclude handling different sized sigset_t's. */
74 if (sigsetsize != sizeof(sigset_t))
75 return -EINVAL;
76
77 if (copy_from_user(&newset, unewset, sizeof(newset)))
78 return -EFAULT;
79 sigdelsetmask(&newset, ~_BLOCKABLE);
80 spin_lock_irq(&current->sighand->siglock);
81 saveset = current->blocked;
82 current->blocked = newset;
83 recalc_sigpending();
84 spin_unlock_irq(&current->sighand->siglock);
85
86 regs->gpr[GPR_RVAL] = -EINTR;
87 while (1) {
88 current->state = TASK_INTERRUPTIBLE;
89 schedule();
90 if (do_signal(regs, &saveset))
91 return -EINTR;
92 }
93}
94
95asmlinkage int
96sys_sigaction(int sig, const struct old_sigaction *act,
97 struct old_sigaction *oact)
98{
99 struct k_sigaction new_ka, old_ka;
100 int ret;
101
102 if (act) {
103 old_sigset_t mask;
104 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
105 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
106 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
107 return -EFAULT;
108 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
109 __get_user(mask, &act->sa_mask);
110 siginitset(&new_ka.sa.sa_mask, mask);
111 }
112
113 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
114
115 if (!ret && oact) {
116 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
117 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
118 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
119 return -EFAULT;
120 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
121 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
122 }
123
124 return ret;
125}
126
127asmlinkage int
128sys_sigaltstack(const stack_t *uss, stack_t *uoss,
129 struct pt_regs *regs)
130{
131 return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]);
132}
133
134
135/*
136 * Do a signal return; undo the signal stack.
137 */
138
139struct sigframe
140{
141 struct sigcontext sc;
142 unsigned long extramask[_NSIG_WORDS-1];
143 unsigned long tramp[2]; /* signal trampoline */
144};
145
146struct rt_sigframe
147{
148 struct siginfo info;
149 struct ucontext uc;
150 unsigned long tramp[2]; /* signal trampoline */
151};
152
153static int
154restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p)
155{
156 unsigned int err = 0;
157
158#define COPY(x) err |= __get_user(regs->x, &sc->regs.x)
159 COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
160 COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
161 COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
162 COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
163 COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
164 COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
165 COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
166 COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
167 COPY(pc); COPY(psw);
168 COPY(ctpc); COPY(ctpsw); COPY(ctbp);
169#undef COPY
170
171 return err;
172}
173
174asmlinkage int sys_sigreturn(struct pt_regs *regs)
175{
176 struct sigframe *frame = (struct sigframe *)regs->gpr[GPR_SP];
177 sigset_t set;
178 int rval;
179
180 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
181 goto badframe;
182
183 if (__get_user(set.sig[0], &frame->sc.oldmask)
184 || (_NSIG_WORDS > 1
185 && __copy_from_user(&set.sig[1], &frame->extramask,
186 sizeof(frame->extramask))))
187 goto badframe;
188
189 sigdelsetmask(&set, ~_BLOCKABLE);
190 spin_lock_irq(&current->sighand->siglock);
191 current->blocked = set;
192 recalc_sigpending();
193 spin_unlock_irq(&current->sighand->siglock);
194
195 if (restore_sigcontext(regs, &frame->sc, &rval))
196 goto badframe;
197 return rval;
198
199badframe:
200 force_sig(SIGSEGV, current);
201 return 0;
202}
203
204asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
205{
206 struct rt_sigframe *frame = (struct rt_sigframe *)regs->gpr[GPR_SP];
207 sigset_t set;
208 stack_t st;
209 int rval;
210
211 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
212 goto badframe;
213
214 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
215 goto badframe;
216
217 sigdelsetmask(&set, ~_BLOCKABLE);
218 spin_lock_irq(&current->sighand->siglock);
219 current->blocked = set;
220 recalc_sigpending();
221 spin_unlock_irq(&current->sighand->siglock);
222
223 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval))
224 goto badframe;
225
226 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
227 goto badframe;
228 /* It is more difficult to avoid calling this function than to
229 call it and ignore errors. */
230 do_sigaltstack(&st, NULL, regs->gpr[GPR_SP]);
231
232 return rval;
233
234badframe:
235 force_sig(SIGSEGV, current);
236 return 0;
237}
238
239/*
240 * Set up a signal frame.
241 */
242
243static int
244setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
245 unsigned long mask)
246{
247 int err = 0;
248
249#define COPY(x) err |= __put_user(regs->x, &sc->regs.x)
250 COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]);
251 COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]);
252 COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]);
253 COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]);
254 COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]);
255 COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]);
256 COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]);
257 COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]);
258 COPY(pc); COPY(psw);
259 COPY(ctpc); COPY(ctpsw); COPY(ctbp);
260#undef COPY
261
262 err |= __put_user(mask, &sc->oldmask);
263
264 return err;
265}
266
267/*
268 * Determine which stack to use..
269 */
270static inline void *
271get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
272{
273 /* Default to using normal stack */
274 unsigned long sp = regs->gpr[GPR_SP];
275
276 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
277 sp = current->sas_ss_sp + current->sas_ss_size;
278
279 return (void *)((sp - frame_size) & -8UL);
280}
281
282static void setup_frame(int sig, struct k_sigaction *ka,
283 sigset_t *set, struct pt_regs *regs)
284{
285 struct sigframe *frame;
286 int err = 0;
287 int signal;
288
289 frame = get_sigframe(ka, regs, sizeof(*frame));
290
291 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
292 goto give_sigsegv;
293
294 signal = current_thread_info()->exec_domain
295 && current_thread_info()->exec_domain->signal_invmap
296 && sig < 32
297 ? current_thread_info()->exec_domain->signal_invmap[sig]
298 : sig;
299
300 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
301
302 if (_NSIG_WORDS > 1) {
303 err |= __copy_to_user(frame->extramask, &set->sig[1],
304 sizeof(frame->extramask));
305 }
306
307 /* Set up to return from userspace. If provided, use a stub
308 already in userspace. */
309 if (ka->sa.sa_flags & SA_RESTORER) {
310 regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
311 } else {
312 /* Note, these encodings are _little endian_! */
313
314 /* addi __NR_sigreturn, r0, r12 */
315 err |= __put_user(0x6600 | (__NR_sigreturn << 16),
316 frame->tramp + 0);
317 /* trap 0 */
318 err |= __put_user(0x010007e0,
319 frame->tramp + 1);
320
321 regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
322
323 flush_cache_sigtramp (regs->gpr[GPR_LP]);
324 }
325
326 if (err)
327 goto give_sigsegv;
328
329 /* Set up registers for signal handler. */
330 regs->pc = (v850_reg_t) ka->sa.sa_handler;
331 regs->gpr[GPR_SP] = (v850_reg_t)frame;
332 /* Signal handler args: */
333 regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
334 regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */
335
336 set_fs(USER_DS);
337
338#if DEBUG_SIG
339 printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n",
340 current->comm, current->pid, frame, regs->pc, );
341#endif
342
343 return;
344
345give_sigsegv:
346 force_sigsegv(sig, current);
347}
348
349static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
350 sigset_t *set, struct pt_regs *regs)
351{
352 struct rt_sigframe *frame;
353 int err = 0;
354 int signal;
355
356 frame = get_sigframe(ka, regs, sizeof(*frame));
357
358 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
359 goto give_sigsegv;
360
361 signal = current_thread_info()->exec_domain
362 && current_thread_info()->exec_domain->signal_invmap
363 && sig < 32
364 ? current_thread_info()->exec_domain->signal_invmap[sig]
365 : sig;
366
367 err |= copy_siginfo_to_user(&frame->info, info);
368
369 /* Create the ucontext. */
370 err |= __put_user(0, &frame->uc.uc_flags);
371 err |= __put_user(0, &frame->uc.uc_link);
372 err |= __put_user((void *)current->sas_ss_sp,
373 &frame->uc.uc_stack.ss_sp);
374 err |= __put_user(sas_ss_flags(regs->gpr[GPR_SP]),
375 &frame->uc.uc_stack.ss_flags);
376 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
377 err |= setup_sigcontext(&frame->uc.uc_mcontext,
378 regs, set->sig[0]);
379 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
380
381 /* Set up to return from userspace. If provided, use a stub
382 already in userspace. */
383 if (ka->sa.sa_flags & SA_RESTORER) {
384 regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer;
385 } else {
386 /* Note, these encodings are _little endian_! */
387
388 /* addi __NR_sigreturn, r0, r12 */
389 err |= __put_user(0x6600 | (__NR_sigreturn << 16),
390 frame->tramp + 0);
391 /* trap 0 */
392 err |= __put_user(0x010007e0,
393 frame->tramp + 1);
394
395 regs->gpr[GPR_LP] = (unsigned long)frame->tramp;
396
397 flush_cache_sigtramp (regs->gpr[GPR_LP]);
398 }
399
400 if (err)
401 goto give_sigsegv;
402
403 /* Set up registers for signal handler. */
404 regs->pc = (v850_reg_t) ka->sa.sa_handler;
405 regs->gpr[GPR_SP] = (v850_reg_t)frame;
406 /* Signal handler args: */
407 regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */
408 regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */
409 regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */
410
411 set_fs(USER_DS);
412
413#if DEBUG_SIG
414 printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n",
415 current->comm, current->pid, frame, regs->pc, regs->pr);
416#endif
417
418 return;
419
420give_sigsegv:
421 force_sigsegv(sig, current);
422}
423
424/*
425 * OK, we're invoking a handler
426 */
427
428static void
429handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
430 sigset_t *oldset, struct pt_regs * regs)
431{
432 /* Are we from a system call? */
433 if (PT_REGS_SYSCALL (regs)) {
434 /* If so, check system call restarting.. */
435 switch (regs->gpr[GPR_RVAL]) {
436 case -ERESTART_RESTARTBLOCK:
437 current_thread_info()->restart_block.fn =
438 do_no_restart_syscall;
439 /* fall through */
440 case -ERESTARTNOHAND:
441 regs->gpr[GPR_RVAL] = -EINTR;
442 break;
443
444 case -ERESTARTSYS:
445 if (!(ka->sa.sa_flags & SA_RESTART)) {
446 regs->gpr[GPR_RVAL] = -EINTR;
447 break;
448 }
449 /* fallthrough */
450 case -ERESTARTNOINTR:
451 regs->gpr[12] = PT_REGS_SYSCALL (regs);
452 regs->pc -= 4; /* Size of `trap 0' insn. */
453 }
454
455 PT_REGS_SET_SYSCALL (regs, 0);
456 }
457
458 /* Set up the stack frame */
459 if (ka->sa.sa_flags & SA_SIGINFO)
460 setup_rt_frame(sig, ka, info, oldset, regs);
461 else
462 setup_frame(sig, ka, oldset, regs);
463
464 spin_lock_irq(&current->sighand->siglock);
465 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
466 if (!(ka->sa.sa_flags & SA_NODEFER))
467 sigaddset(&current->blocked,sig);
468 recalc_sigpending();
469 spin_unlock_irq(&current->sighand->siglock);
470}
471
472/*
473 * Note that 'init' is a special process: it doesn't get signals it doesn't
474 * want to handle. Thus you cannot kill init even with a SIGKILL even by
475 * mistake.
476 *
477 * Note that we go through the signals twice: once to check the signals that
478 * the kernel can handle, and then we build all the user-level signal handling
479 * stack-frames in one go after that.
480 */
481int do_signal(struct pt_regs *regs, sigset_t *oldset)
482{
483 siginfo_t info;
484 int signr;
485 struct k_sigaction ka;
486
487 /*
488 * We want the common case to go fast, which
489 * is why we may in certain cases get here from
490 * kernel mode. Just return without doing anything
491 * if so.
492 */
493 if (!user_mode(regs))
494 return 1;
495
496 if (!oldset)
497 oldset = &current->blocked;
498
499 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
500 if (signr > 0) {
501 /* Whee! Actually deliver the signal. */
502 handle_signal(signr, &info, &ka, oldset, regs);
503 return 1;
504 }
505
506 /* Did we come from a system call? */
507 if (PT_REGS_SYSCALL (regs)) {
508 int rval = (int)regs->gpr[GPR_RVAL];
509 /* Restart the system call - no handlers present */
510 if (rval == -ERESTARTNOHAND
511 || rval == -ERESTARTSYS
512 || rval == -ERESTARTNOINTR)
513 {
514 regs->gpr[12] = PT_REGS_SYSCALL (regs);
515 regs->pc -= 4; /* Size of `trap 0' insn. */
516 }
517 else if (rval == -ERESTART_RESTARTBLOCK) {
518 regs->gpr[12] = __NR_restart_syscall;
519 regs->pc -= 4; /* Size of `trap 0' insn. */
520 }
521 }
522 return 0;
523}
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