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-rw-r--r--arch/arm26/kernel/signal.c538
1 files changed, 0 insertions, 538 deletions
diff --git a/arch/arm26/kernel/signal.c b/arch/arm26/kernel/signal.c
deleted file mode 100644
index 379b82dc645f..000000000000
--- a/arch/arm26/kernel/signal.c
+++ /dev/null
@@ -1,538 +0,0 @@
1/*
2 * linux/arch/arm26/kernel/signal.c
3 *
4 * Copyright (C) 1995-2002 Russell King
5 * Copyright (C) 2003 Ian Molton (ARM26)
6 *
7 * FIXME!!! This is probably very broken (13/05/2003)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/smp.h>
16#include <linux/kernel.h>
17#include <linux/errno.h>
18#include <linux/signal.h>
19#include <linux/wait.h>
20#include <linux/ptrace.h>
21#include <linux/personality.h>
22#include <linux/tty.h>
23#include <linux/binfmts.h>
24#include <linux/elf.h>
25
26#include <asm/pgalloc.h>
27#include <asm/ucontext.h>
28#include <asm/uaccess.h>
29#include <asm/unistd.h>
30
31#include "ptrace.h"
32
33#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
34
35/*
36 * For ARM syscalls, we encode the syscall number into the instruction.
37 */
38#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
39#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
40
41static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
42
43/*
44 * atomically swap in the new signal mask, and wait for a signal.
45 */
46asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
47{
48 sigset_t saveset;
49
50 mask &= _BLOCKABLE;
51 spin_lock_irq(&current->sighand->siglock);
52 saveset = current->blocked;
53 siginitset(&current->blocked, mask);
54 recalc_sigpending();
55 spin_unlock_irq(&current->sighand->siglock);
56 regs->ARM_r0 = -EINTR;
57
58 while (1) {
59 current->state = TASK_INTERRUPTIBLE;
60 schedule();
61 if (do_signal(&saveset, regs, 0))
62 return regs->ARM_r0;
63 }
64}
65
66asmlinkage int
67sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, struct pt_regs *regs)
68{
69 sigset_t saveset, newset;
70
71 /* XXX: Don't preclude handling different sized sigset_t's. */
72 if (sigsetsize != sizeof(sigset_t))
73 return -EINVAL;
74
75 if (copy_from_user(&newset, unewset, sizeof(newset)))
76 return -EFAULT;
77 sigdelsetmask(&newset, ~_BLOCKABLE);
78
79 spin_lock_irq(&current->sighand->siglock);
80 saveset = current->blocked;
81 current->blocked = newset;
82 recalc_sigpending();
83 spin_unlock_irq(&current->sighand->siglock);
84 regs->ARM_r0 = -EINTR;
85
86 while (1) {
87 current->state = TASK_INTERRUPTIBLE;
88 schedule();
89 if (do_signal(&saveset, regs, 0))
90 return regs->ARM_r0;
91 }
92}
93
94asmlinkage int
95sys_sigaction(int sig, const struct old_sigaction *act,
96 struct old_sigaction *oact)
97{
98 struct k_sigaction new_ka, old_ka;
99 int ret;
100
101 if (act) {
102 old_sigset_t mask;
103 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
104 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
105 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
106 return -EFAULT;
107 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
108 __get_user(mask, &act->sa_mask);
109 siginitset(&new_ka.sa.sa_mask, mask);
110 }
111
112 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
113
114 if (!ret && oact) {
115 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
116 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
117 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
118 return -EFAULT;
119 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
120 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
121 }
122
123 return ret;
124}
125
126/*
127 * Do a signal return; undo the signal stack.
128 */
129struct sigframe
130{
131 struct sigcontext sc;
132 unsigned long extramask[_NSIG_WORDS-1];
133 unsigned long retcode;
134};
135
136struct rt_sigframe
137{
138 struct siginfo *pinfo;
139 void *puc;
140 struct siginfo info;
141 struct ucontext uc;
142 unsigned long retcode;
143};
144
145static int
146restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
147{
148 int err = 0;
149
150 __get_user_error(regs->ARM_r0, &sc->arm_r0, err);
151 __get_user_error(regs->ARM_r1, &sc->arm_r1, err);
152 __get_user_error(regs->ARM_r2, &sc->arm_r2, err);
153 __get_user_error(regs->ARM_r3, &sc->arm_r3, err);
154 __get_user_error(regs->ARM_r4, &sc->arm_r4, err);
155 __get_user_error(regs->ARM_r5, &sc->arm_r5, err);
156 __get_user_error(regs->ARM_r6, &sc->arm_r6, err);
157 __get_user_error(regs->ARM_r7, &sc->arm_r7, err);
158 __get_user_error(regs->ARM_r8, &sc->arm_r8, err);
159 __get_user_error(regs->ARM_r9, &sc->arm_r9, err);
160 __get_user_error(regs->ARM_r10, &sc->arm_r10, err);
161 __get_user_error(regs->ARM_fp, &sc->arm_fp, err);
162 __get_user_error(regs->ARM_ip, &sc->arm_ip, err);
163 __get_user_error(regs->ARM_sp, &sc->arm_sp, err);
164 __get_user_error(regs->ARM_lr, &sc->arm_lr, err);
165 __get_user_error(regs->ARM_pc, &sc->arm_pc, err);
166
167 err |= !valid_user_regs(regs);
168
169 return err;
170}
171
172asmlinkage int sys_sigreturn(struct pt_regs *regs)
173{
174 struct sigframe *frame;
175 sigset_t set;
176
177 /*
178 * Since we stacked the signal on a 64-bit boundary,
179 * then 'sp' should be word aligned here. If it's
180 * not, then the user is trying to mess with us.
181 */
182 if (regs->ARM_sp & 7)
183 goto badframe;
184
185 frame = (struct sigframe *)regs->ARM_sp;
186
187 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
188 goto badframe;
189 if (__get_user(set.sig[0], &frame->sc.oldmask)
190 || (_NSIG_WORDS > 1
191 && __copy_from_user(&set.sig[1], &frame->extramask,
192 sizeof(frame->extramask))))
193 goto badframe;
194
195 sigdelsetmask(&set, ~_BLOCKABLE);
196 spin_lock_irq(&current->sighand->siglock);
197 current->blocked = set;
198 recalc_sigpending();
199 spin_unlock_irq(&current->sighand->siglock);
200
201 if (restore_sigcontext(regs, &frame->sc))
202 goto badframe;
203
204 /* Send SIGTRAP if we're single-stepping */
205 if (current->ptrace & PT_SINGLESTEP) {
206 ptrace_cancel_bpt(current);
207 send_sig(SIGTRAP, current, 1);
208 }
209
210 return regs->ARM_r0;
211
212badframe:
213 force_sig(SIGSEGV, current);
214 return 0;
215}
216
217asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
218{
219 struct rt_sigframe *frame;
220 sigset_t set;
221
222 /*
223 * Since we stacked the signal on a 64-bit boundary,
224 * then 'sp' should be word aligned here. If it's
225 * not, then the user is trying to mess with us.
226 */
227 if (regs->ARM_sp & 7)
228 goto badframe;
229
230 frame = (struct rt_sigframe *)regs->ARM_sp;
231
232 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
233 goto badframe;
234 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
235 goto badframe;
236
237 sigdelsetmask(&set, ~_BLOCKABLE);
238 spin_lock_irq(&current->sighand->siglock);
239 current->blocked = set;
240 recalc_sigpending();
241 spin_unlock_irq(&current->sighand->siglock);
242
243 if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
244 goto badframe;
245
246 /* Send SIGTRAP if we're single-stepping */
247 if (current->ptrace & PT_SINGLESTEP) {
248 ptrace_cancel_bpt(current);
249 send_sig(SIGTRAP, current, 1);
250 }
251
252 return regs->ARM_r0;
253
254badframe:
255 force_sig(SIGSEGV, current);
256 return 0;
257}
258
259static int
260setup_sigcontext(struct sigcontext *sc, /*struct _fpstate *fpstate,*/
261 struct pt_regs *regs, unsigned long mask)
262{
263 int err = 0;
264
265 __put_user_error(regs->ARM_r0, &sc->arm_r0, err);
266 __put_user_error(regs->ARM_r1, &sc->arm_r1, err);
267 __put_user_error(regs->ARM_r2, &sc->arm_r2, err);
268 __put_user_error(regs->ARM_r3, &sc->arm_r3, err);
269 __put_user_error(regs->ARM_r4, &sc->arm_r4, err);
270 __put_user_error(regs->ARM_r5, &sc->arm_r5, err);
271 __put_user_error(regs->ARM_r6, &sc->arm_r6, err);
272 __put_user_error(regs->ARM_r7, &sc->arm_r7, err);
273 __put_user_error(regs->ARM_r8, &sc->arm_r8, err);
274 __put_user_error(regs->ARM_r9, &sc->arm_r9, err);
275 __put_user_error(regs->ARM_r10, &sc->arm_r10, err);
276 __put_user_error(regs->ARM_fp, &sc->arm_fp, err);
277 __put_user_error(regs->ARM_ip, &sc->arm_ip, err);
278 __put_user_error(regs->ARM_sp, &sc->arm_sp, err);
279 __put_user_error(regs->ARM_lr, &sc->arm_lr, err);
280 __put_user_error(regs->ARM_pc, &sc->arm_pc, err);
281
282 __put_user_error(current->thread.trap_no, &sc->trap_no, err);
283 __put_user_error(current->thread.error_code, &sc->error_code, err);
284 __put_user_error(current->thread.address, &sc->fault_address, err);
285 __put_user_error(mask, &sc->oldmask, err);
286
287 return err;
288}
289
290static inline void *
291get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
292{
293 unsigned long sp = regs->ARM_sp;
294
295 /*
296 * This is the X/Open sanctioned signal stack switching.
297 */
298 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
299 sp = current->sas_ss_sp + current->sas_ss_size;
300
301 /*
302 * ATPCS B01 mandates 8-byte alignment
303 */
304 return (void *)((sp - framesize) & ~7);
305}
306
307static int
308setup_return(struct pt_regs *regs, struct k_sigaction *ka,
309 unsigned long *rc, void *frame, int usig)
310{
311 unsigned long handler = (unsigned long)ka->sa.sa_handler;
312 unsigned long retcode;
313
314 if (ka->sa.sa_flags & SA_RESTORER) {
315 retcode = (unsigned long)ka->sa.sa_restorer;
316 } else {
317
318 if (__put_user((ka->sa.sa_flags & SA_SIGINFO)?SWI_SYS_RT_SIGRETURN:SWI_SYS_SIGRETURN, rc))
319 return 1;
320
321 retcode = ((unsigned long)rc);
322 }
323
324 regs->ARM_r0 = usig;
325 regs->ARM_sp = (unsigned long)frame;
326 regs->ARM_lr = retcode;
327 regs->ARM_pc = handler & ~3;
328
329 return 0;
330}
331
332static int
333setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
334{
335 struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
336 int err = 0;
337
338 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
339 return 1;
340
341 err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
342
343 if (_NSIG_WORDS > 1) {
344 err |= __copy_to_user(frame->extramask, &set->sig[1],
345 sizeof(frame->extramask));
346 }
347
348 if (err == 0)
349 err = setup_return(regs, ka, &frame->retcode, frame, usig);
350
351 return err;
352}
353
354static int
355setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
356 sigset_t *set, struct pt_regs *regs)
357{
358 struct rt_sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
359 int err = 0;
360
361 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
362 return 1;
363
364 __put_user_error(&frame->info, &frame->pinfo, err);
365 __put_user_error(&frame->uc, &frame->puc, err);
366 err |= copy_siginfo_to_user(&frame->info, info);
367
368 /* Clear all the bits of the ucontext we don't use. */
369 err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
370
371 err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
372 regs, set->sig[0]);
373 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
374
375 if (err == 0)
376 err = setup_return(regs, ka, &frame->retcode, frame, usig);
377
378 if (err == 0) {
379 /*
380 * For realtime signals we must also set the second and third
381 * arguments for the signal handler.
382 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
383 */
384 regs->ARM_r1 = (unsigned long)frame->pinfo;
385 regs->ARM_r2 = (unsigned long)frame->puc;
386 }
387
388 return err;
389}
390
391static inline void restart_syscall(struct pt_regs *regs)
392{
393 regs->ARM_r0 = regs->ARM_ORIG_r0;
394 regs->ARM_pc -= 4;
395}
396
397/*
398 * OK, we're invoking a handler
399 */
400static void
401handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
402 struct pt_regs * regs, int syscall)
403{
404 struct thread_info *thread = current_thread_info();
405 struct task_struct *tsk = current;
406 struct k_sigaction *ka = &tsk->sighand->action[sig-1];
407 int usig = sig;
408 int ret;
409
410 /*
411 * If we were from a system call, check for system call restarting...
412 */
413 if (syscall) {
414 switch (regs->ARM_r0) {
415 case -ERESTART_RESTARTBLOCK:
416 current_thread_info()->restart_block.fn =
417 do_no_restart_syscall;
418 case -ERESTARTNOHAND:
419 regs->ARM_r0 = -EINTR;
420 break;
421 case -ERESTARTSYS:
422 if (!(ka->sa.sa_flags & SA_RESTART)) {
423 regs->ARM_r0 = -EINTR;
424 break;
425 }
426 /* fallthrough */
427 case -ERESTARTNOINTR:
428 restart_syscall(regs);
429 }
430 }
431
432 /*
433 * translate the signal
434 */
435 if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
436 usig = thread->exec_domain->signal_invmap[usig];
437
438 /*
439 * Set up the stack frame
440 */
441 if (ka->sa.sa_flags & SA_SIGINFO)
442 ret = setup_rt_frame(usig, ka, info, oldset, regs);
443 else
444 ret = setup_frame(usig, ka, oldset, regs);
445
446 /*
447 * Check that the resulting registers are actually sane.
448 */
449 ret |= !valid_user_regs(regs);
450
451 if (ret == 0) {
452 if (ka->sa.sa_flags & SA_ONESHOT)
453 ka->sa.sa_handler = SIG_DFL;
454
455 spin_lock_irq(&tsk->sighand->siglock);
456 sigorsets(&tsk->blocked, &tsk->blocked,
457 &ka->sa.sa_mask);
458 if (!(ka->sa.sa_flags & SA_NODEFER))
459 sigaddset(&tsk->blocked, sig);
460 recalc_sigpending();
461 spin_unlock_irq(&tsk->sighand->siglock);
462 return;
463 }
464
465 force_sigsegv(sig, tsk);
466}
467
468/*
469 * Note that 'init' is a special process: it doesn't get signals it doesn't
470 * want to handle. Thus you cannot kill init even with a SIGKILL even by
471 * mistake.
472 *
473 * Note that we go through the signals twice: once to check the signals that
474 * the kernel can handle, and then we build all the user-level signal handling
475 * stack-frames in one go after that.
476 */
477static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
478{
479 siginfo_t info;
480 int signr;
481 struct k_sigaction ka;
482
483 /*
484 * We want the common case to go fast, which
485 * is why we may in certain cases get here from
486 * kernel mode. Just return without doing anything
487 * if so.
488 */
489 if (!user_mode(regs))
490 return 0;
491
492 if (current->ptrace & PT_SINGLESTEP)
493 ptrace_cancel_bpt(current);
494
495 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
496 if (signr > 0) {
497 handle_signal(signr, &info, oldset, regs, syscall);
498 if (current->ptrace & PT_SINGLESTEP)
499 ptrace_set_bpt(current);
500 return 1;
501 }
502
503 /*
504 * No signal to deliver to the process - restart the syscall.
505 */
506 if (syscall) {
507 if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) {
508 u32 *usp;
509
510 regs->ARM_sp -= 12;
511 usp = (u32 *)regs->ARM_sp;
512
513 put_user(regs->ARM_pc, &usp[0]);
514 /* swi __NR_restart_syscall */
515 put_user(0xef000000 | __NR_restart_syscall, &usp[1]);
516 /* ldr pc, [sp], #12 */
517// FIXME!!! is #12 correct there?
518 put_user(0xe49df00c, &usp[2]);
519
520 regs->ARM_pc = regs->ARM_sp + 4;
521 }
522 if (regs->ARM_r0 == -ERESTARTNOHAND ||
523 regs->ARM_r0 == -ERESTARTSYS ||
524 regs->ARM_r0 == -ERESTARTNOINTR) {
525 restart_syscall(regs);
526 }
527 }
528 if (current->ptrace & PT_SINGLESTEP)
529 ptrace_set_bpt(current);
530 return 0;
531}
532
533asmlinkage void
534do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
535{
536 if (thread_flags & _TIF_SIGPENDING)
537 do_signal(&current->blocked, regs, syscall);
538}
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