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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh64/kernel/signal.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sh64/kernel/signal.c')
-rw-r--r--arch/sh64/kernel/signal.c727
1 files changed, 727 insertions, 0 deletions
diff --git a/arch/sh64/kernel/signal.c b/arch/sh64/kernel/signal.c
new file mode 100644
index 000000000000..45ad1026dde7
--- /dev/null
+++ b/arch/sh64/kernel/signal.c
@@ -0,0 +1,727 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * arch/sh64/kernel/signal.c
7 *
8 * Copyright (C) 2000, 2001 Paolo Alberelli
9 * Copyright (C) 2003 Paul Mundt
10 * Copyright (C) 2004 Richard Curnow
11 *
12 * Started from sh version.
13 *
14 */
15#include <linux/rwsem.h>
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/smp_lock.h>
20#include <linux/kernel.h>
21#include <linux/signal.h>
22#include <linux/errno.h>
23#include <linux/wait.h>
24#include <linux/personality.h>
25#include <linux/suspend.h>
26#include <linux/ptrace.h>
27#include <linux/unistd.h>
28#include <linux/stddef.h>
29#include <linux/personality.h>
30#include <asm/ucontext.h>
31#include <asm/uaccess.h>
32#include <asm/pgtable.h>
33
34
35#define REG_RET 9
36#define REG_ARG1 2
37#define REG_ARG2 3
38#define REG_ARG3 4
39#define REG_SP 15
40#define REG_PR 18
41#define REF_REG_RET regs->regs[REG_RET]
42#define REF_REG_SP regs->regs[REG_SP]
43#define DEREF_REG_PR regs->regs[REG_PR]
44
45#define DEBUG_SIG 0
46
47#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
48
49asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
50
51/*
52 * Atomically swap in the new signal mask, and wait for a signal.
53 */
54
55asmlinkage int
56sys_sigsuspend(old_sigset_t mask,
57 unsigned long r3, unsigned long r4, unsigned long r5,
58 unsigned long r6, unsigned long r7,
59 struct pt_regs * regs)
60{
61 sigset_t saveset;
62
63 mask &= _BLOCKABLE;
64 spin_lock_irq(&current->sighand->siglock);
65 saveset = current->blocked;
66 siginitset(&current->blocked, mask);
67 recalc_sigpending();
68 spin_unlock_irq(&current->sighand->siglock);
69
70 REF_REG_RET = -EINTR;
71 while (1) {
72 current->state = TASK_INTERRUPTIBLE;
73 schedule();
74 regs->pc += 4; /* because sys_sigreturn decrements the pc */
75 if (do_signal(regs, &saveset)) {
76 /* pc now points at signal handler. Need to decrement
77 it because entry.S will increment it. */
78 regs->pc -= 4;
79 return -EINTR;
80 }
81 }
82}
83
84asmlinkage int
85sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
86 unsigned long r4, unsigned long r5, unsigned long r6,
87 unsigned long r7,
88 struct pt_regs * regs)
89{
90 sigset_t saveset, newset;
91
92 /* XXX: Don't preclude handling different sized sigset_t's. */
93 if (sigsetsize != sizeof(sigset_t))
94 return -EINVAL;
95
96 if (copy_from_user(&newset, unewset, sizeof(newset)))
97 return -EFAULT;
98 sigdelsetmask(&newset, ~_BLOCKABLE);
99 spin_lock_irq(&current->sighand->siglock);
100 saveset = current->blocked;
101 current->blocked = newset;
102 recalc_sigpending();
103 spin_unlock_irq(&current->sighand->siglock);
104
105 REF_REG_RET = -EINTR;
106 while (1) {
107 current->state = TASK_INTERRUPTIBLE;
108 schedule();
109 regs->pc += 4; /* because sys_sigreturn decrements the pc */
110 if (do_signal(regs, &saveset)) {
111 /* pc now points at signal handler. Need to decrement
112 it because entry.S will increment it. */
113 regs->pc -= 4;
114 return -EINTR;
115 }
116 }
117}
118
119asmlinkage int
120sys_sigaction(int sig, const struct old_sigaction __user *act,
121 struct old_sigaction __user *oact)
122{
123 struct k_sigaction new_ka, old_ka;
124 int ret;
125
126 if (act) {
127 old_sigset_t mask;
128 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
129 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
130 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
131 return -EFAULT;
132 __get_user(new_ka.sa.sa_flags, &act->sa_flags);
133 __get_user(mask, &act->sa_mask);
134 siginitset(&new_ka.sa.sa_mask, mask);
135 }
136
137 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
138
139 if (!ret && oact) {
140 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
141 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
142 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
143 return -EFAULT;
144 __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
145 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
146 }
147
148 return ret;
149}
150
151asmlinkage int
152sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
153 unsigned long r4, unsigned long r5, unsigned long r6,
154 unsigned long r7,
155 struct pt_regs * regs)
156{
157 return do_sigaltstack(uss, uoss, REF_REG_SP);
158}
159
160
161/*
162 * Do a signal return; undo the signal stack.
163 */
164
165struct sigframe
166{
167 struct sigcontext sc;
168 unsigned long extramask[_NSIG_WORDS-1];
169 long long retcode[2];
170};
171
172struct rt_sigframe
173{
174 struct siginfo __user *pinfo;
175 void *puc;
176 struct siginfo info;
177 struct ucontext uc;
178 long long retcode[2];
179};
180
181#ifdef CONFIG_SH_FPU
182static inline int
183restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
184{
185 int err = 0;
186 int fpvalid;
187
188 err |= __get_user (fpvalid, &sc->sc_fpvalid);
189 conditional_used_math(fpvalid);
190 if (! fpvalid)
191 return err;
192
193 if (current == last_task_used_math) {
194 last_task_used_math = NULL;
195 regs->sr |= SR_FD;
196 }
197
198 err |= __copy_from_user(&current->thread.fpu.hard, &sc->sc_fpregs[0],
199 (sizeof(long long) * 32) + (sizeof(int) * 1));
200
201 return err;
202}
203
204static inline int
205setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
206{
207 int err = 0;
208 int fpvalid;
209
210 fpvalid = !!used_math();
211 err |= __put_user(fpvalid, &sc->sc_fpvalid);
212 if (! fpvalid)
213 return err;
214
215 if (current == last_task_used_math) {
216 grab_fpu();
217 fpsave(&current->thread.fpu.hard);
218 release_fpu();
219 last_task_used_math = NULL;
220 regs->sr |= SR_FD;
221 }
222
223 err |= __copy_to_user(&sc->sc_fpregs[0], &current->thread.fpu.hard,
224 (sizeof(long long) * 32) + (sizeof(int) * 1));
225 clear_used_math();
226
227 return err;
228}
229#else
230static inline int
231restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
232{}
233static inline int
234setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc)
235{}
236#endif
237
238static int
239restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p)
240{
241 unsigned int err = 0;
242 unsigned long long current_sr, new_sr;
243#define SR_MASK 0xffff8cfd
244
245#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
246
247 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
248 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
249 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
250 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
251 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
252 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
253 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
254 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
255 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
256 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
257 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
258 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
259 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
260 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
261 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
262 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
263 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
264 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
265
266 /* Prevent the signal handler manipulating SR in a way that can
267 crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be
268 modified */
269 current_sr = regs->sr;
270 err |= __get_user(new_sr, &sc->sc_sr);
271 regs->sr &= SR_MASK;
272 regs->sr |= (new_sr & ~SR_MASK);
273
274 COPY(pc);
275
276#undef COPY
277
278 /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr
279 * has been restored above.) */
280 err |= restore_sigcontext_fpu(regs, sc);
281
282 regs->syscall_nr = -1; /* disable syscall checks */
283 err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]);
284 return err;
285}
286
287asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
288 unsigned long r4, unsigned long r5,
289 unsigned long r6, unsigned long r7,
290 struct pt_regs * regs)
291{
292 struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP;
293 sigset_t set;
294 long long ret;
295
296 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
297 goto badframe;
298
299 if (__get_user(set.sig[0], &frame->sc.oldmask)
300 || (_NSIG_WORDS > 1
301 && __copy_from_user(&set.sig[1], &frame->extramask,
302 sizeof(frame->extramask))))
303 goto badframe;
304
305 sigdelsetmask(&set, ~_BLOCKABLE);
306
307 spin_lock_irq(&current->sighand->siglock);
308 current->blocked = set;
309 recalc_sigpending();
310 spin_unlock_irq(&current->sighand->siglock);
311
312 if (restore_sigcontext(regs, &frame->sc, &ret))
313 goto badframe;
314 regs->pc -= 4;
315
316 return (int) ret;
317
318badframe:
319 force_sig(SIGSEGV, current);
320 return 0;
321}
322
323asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
324 unsigned long r4, unsigned long r5,
325 unsigned long r6, unsigned long r7,
326 struct pt_regs * regs)
327{
328 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP;
329 sigset_t set;
330 stack_t __user st;
331 long long ret;
332
333 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
334 goto badframe;
335
336 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
337 goto badframe;
338
339 sigdelsetmask(&set, ~_BLOCKABLE);
340 spin_lock_irq(&current->sighand->siglock);
341 current->blocked = set;
342 recalc_sigpending();
343 spin_unlock_irq(&current->sighand->siglock);
344
345 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
346 goto badframe;
347 regs->pc -= 4;
348
349 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
350 goto badframe;
351 /* It is more difficult to avoid calling this function than to
352 call it and ignore errors. */
353 do_sigaltstack(&st, NULL, REF_REG_SP);
354
355 return (int) ret;
356
357badframe:
358 force_sig(SIGSEGV, current);
359 return 0;
360}
361
362/*
363 * Set up a signal frame.
364 */
365
366static int
367setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
368 unsigned long mask)
369{
370 int err = 0;
371
372 /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */
373 err |= setup_sigcontext_fpu(regs, sc);
374
375#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
376
377 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]);
378 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]);
379 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]);
380 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]);
381 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]);
382 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]);
383 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]);
384 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]);
385 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]);
386 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]);
387 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]);
388 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]);
389 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]);
390 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]);
391 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]);
392 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]);
393 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]);
394 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]);
395 COPY(sr); COPY(pc);
396
397#undef COPY
398
399 err |= __put_user(mask, &sc->oldmask);
400
401 return err;
402}
403
404/*
405 * Determine which stack to use..
406 */
407static inline void __user *
408get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
409{
410 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
411 sp = current->sas_ss_sp + current->sas_ss_size;
412
413 return (void __user *)((sp - frame_size) & -8ul);
414}
415
416void sa_default_restorer(void); /* See comments below */
417void sa_default_rt_restorer(void); /* See comments below */
418
419static void setup_frame(int sig, struct k_sigaction *ka,
420 sigset_t *set, struct pt_regs *regs)
421{
422 struct sigframe __user *frame;
423 int err = 0;
424 int signal;
425
426 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
427
428 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
429 goto give_sigsegv;
430
431 signal = current_thread_info()->exec_domain
432 && current_thread_info()->exec_domain->signal_invmap
433 && sig < 32
434 ? current_thread_info()->exec_domain->signal_invmap[sig]
435 : sig;
436
437 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
438
439 /* Give up earlier as i386, in case */
440 if (err)
441 goto give_sigsegv;
442
443 if (_NSIG_WORDS > 1) {
444 err |= __copy_to_user(frame->extramask, &set->sig[1],
445 sizeof(frame->extramask)); }
446
447 /* Give up earlier as i386, in case */
448 if (err)
449 goto give_sigsegv;
450
451 /* Set up to return from userspace. If provided, use a stub
452 already in userspace. */
453 if (ka->sa.sa_flags & SA_RESTORER) {
454 DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
455
456 /*
457 * On SH5 all edited pointers are subject to NEFF
458 */
459 DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
460 (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
461 } else {
462 /*
463 * Different approach on SH5.
464 * . Endianness independent asm code gets placed in entry.S .
465 * This is limited to four ASM instructions corresponding
466 * to two long longs in size.
467 * . err checking is done on the else branch only
468 * . flush_icache_range() is called upon __put_user() only
469 * . all edited pointers are subject to NEFF
470 * . being code, linker turns ShMedia bit on, always
471 * dereference index -1.
472 */
473 DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
474 DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
475 (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
476
477 if (__copy_to_user(frame->retcode,
478 (unsigned long long)sa_default_restorer & (~1), 16) != 0)
479 goto give_sigsegv;
480
481 /* Cohere the trampoline with the I-cache. */
482 flush_cache_sigtramp(DEREF_REG_PR-1, DEREF_REG_PR-1+16);
483 }
484
485 /*
486 * Set up registers for signal handler.
487 * All edited pointers are subject to NEFF.
488 */
489 regs->regs[REG_SP] = (unsigned long) frame;
490 regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
491 (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
492 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
493
494 /* FIXME:
495 The glibc profiling support for SH-5 needs to be passed a sigcontext
496 so it can retrieve the PC. At some point during 2003 the glibc
497 support was changed to receive the sigcontext through the 2nd
498 argument, but there are still versions of libc.so in use that use
499 the 3rd argument. Until libc.so is stabilised, pass the sigcontext
500 through both 2nd and 3rd arguments.
501 */
502
503 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
504 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc;
505
506 regs->pc = (unsigned long) ka->sa.sa_handler;
507 regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
508
509 set_fs(USER_DS);
510
511#if DEBUG_SIG
512 /* Broken %016Lx */
513 printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
514 signal,
515 current->comm, current->pid, frame,
516 regs->pc >> 32, regs->pc & 0xffffffff,
517 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
518#endif
519
520 return;
521
522give_sigsegv:
523 force_sigsegv(sig, current);
524}
525
526static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
527 sigset_t *set, struct pt_regs *regs)
528{
529 struct rt_sigframe __user *frame;
530 int err = 0;
531 int signal;
532
533 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame));
534
535 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
536 goto give_sigsegv;
537
538 signal = current_thread_info()->exec_domain
539 && current_thread_info()->exec_domain->signal_invmap
540 && sig < 32
541 ? current_thread_info()->exec_domain->signal_invmap[sig]
542 : sig;
543
544 err |= __put_user(&frame->info, &frame->pinfo);
545 err |= __put_user(&frame->uc, &frame->puc);
546 err |= copy_siginfo_to_user(&frame->info, info);
547
548 /* Give up earlier as i386, in case */
549 if (err)
550 goto give_sigsegv;
551
552 /* Create the ucontext. */
553 err |= __put_user(0, &frame->uc.uc_flags);
554 err |= __put_user(0, &frame->uc.uc_link);
555 err |= __put_user((void *)current->sas_ss_sp,
556 &frame->uc.uc_stack.ss_sp);
557 err |= __put_user(sas_ss_flags(regs->regs[REG_SP]),
558 &frame->uc.uc_stack.ss_flags);
559 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
560 err |= setup_sigcontext(&frame->uc.uc_mcontext,
561 regs, set->sig[0]);
562 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
563
564 /* Give up earlier as i386, in case */
565 if (err)
566 goto give_sigsegv;
567
568 /* Set up to return from userspace. If provided, use a stub
569 already in userspace. */
570 if (ka->sa.sa_flags & SA_RESTORER) {
571 DEREF_REG_PR = (unsigned long) ka->sa.sa_restorer | 0x1;
572
573 /*
574 * On SH5 all edited pointers are subject to NEFF
575 */
576 DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
577 (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
578 } else {
579 /*
580 * Different approach on SH5.
581 * . Endianness independent asm code gets placed in entry.S .
582 * This is limited to four ASM instructions corresponding
583 * to two long longs in size.
584 * . err checking is done on the else branch only
585 * . flush_icache_range() is called upon __put_user() only
586 * . all edited pointers are subject to NEFF
587 * . being code, linker turns ShMedia bit on, always
588 * dereference index -1.
589 */
590
591 DEREF_REG_PR = (unsigned long) frame->retcode | 0x01;
592 DEREF_REG_PR = (DEREF_REG_PR & NEFF_SIGN) ?
593 (DEREF_REG_PR | NEFF_MASK) : DEREF_REG_PR;
594
595 if (__copy_to_user(frame->retcode,
596 (unsigned long long)sa_default_rt_restorer & (~1), 16) != 0)
597 goto give_sigsegv;
598
599 flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15);
600 }
601
602 /*
603 * Set up registers for signal handler.
604 * All edited pointers are subject to NEFF.
605 */
606 regs->regs[REG_SP] = (unsigned long) frame;
607 regs->regs[REG_SP] = (regs->regs[REG_SP] & NEFF_SIGN) ?
608 (regs->regs[REG_SP] | NEFF_MASK) : regs->regs[REG_SP];
609 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */
610 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info;
611 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext;
612 regs->pc = (unsigned long) ka->sa.sa_handler;
613 regs->pc = (regs->pc & NEFF_SIGN) ? (regs->pc | NEFF_MASK) : regs->pc;
614
615 set_fs(USER_DS);
616
617#if DEBUG_SIG
618 /* Broken %016Lx */
619 printk("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n",
620 signal,
621 current->comm, current->pid, frame,
622 regs->pc >> 32, regs->pc & 0xffffffff,
623 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff);
624#endif
625
626 return;
627
628give_sigsegv:
629 force_sigsegv(sig, current);
630}
631
632/*
633 * OK, we're invoking a handler
634 */
635
636static void
637handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
638 sigset_t *oldset, struct pt_regs * regs)
639{
640 /* Are we from a system call? */
641 if (regs->syscall_nr >= 0) {
642 /* If so, check system call restarting.. */
643 switch (regs->regs[REG_RET]) {
644 case -ERESTARTNOHAND:
645 regs->regs[REG_RET] = -EINTR;
646 break;
647
648 case -ERESTARTSYS:
649 if (!(ka->sa.sa_flags & SA_RESTART)) {
650 regs->regs[REG_RET] = -EINTR;
651 break;
652 }
653 /* fallthrough */
654 case -ERESTARTNOINTR:
655 /* Decode syscall # */
656 regs->regs[REG_RET] = regs->syscall_nr;
657 regs->pc -= 4;
658 }
659 }
660
661 /* Set up the stack frame */
662 if (ka->sa.sa_flags & SA_SIGINFO)
663 setup_rt_frame(sig, ka, info, oldset, regs);
664 else
665 setup_frame(sig, ka, oldset, regs);
666
667 if (!(ka->sa.sa_flags & SA_NODEFER)) {
668 spin_lock_irq(&current->sighand->siglock);
669 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
670 sigaddset(&current->blocked,sig);
671 recalc_sigpending();
672 spin_unlock_irq(&current->sighand->siglock);
673 }
674}
675
676/*
677 * Note that 'init' is a special process: it doesn't get signals it doesn't
678 * want to handle. Thus you cannot kill init even with a SIGKILL even by
679 * mistake.
680 *
681 * Note that we go through the signals twice: once to check the signals that
682 * the kernel can handle, and then we build all the user-level signal handling
683 * stack-frames in one go after that.
684 */
685int do_signal(struct pt_regs *regs, sigset_t *oldset)
686{
687 siginfo_t info;
688 int signr;
689 struct k_sigaction ka;
690
691 /*
692 * We want the common case to go fast, which
693 * is why we may in certain cases get here from
694 * kernel mode. Just return without doing anything
695 * if so.
696 */
697 if (!user_mode(regs))
698 return 1;
699
700 if (try_to_freeze(0))
701 goto no_signal;
702
703 if (!oldset)
704 oldset = &current->blocked;
705
706 signr = get_signal_to_deliver(&info, &ka, regs, 0);
707
708 if (signr > 0) {
709 /* Whee! Actually deliver the signal. */
710 handle_signal(signr, &info, &ka, oldset, regs);
711 return 1;
712 }
713
714no_signal:
715 /* Did we come from a system call? */
716 if (regs->syscall_nr >= 0) {
717 /* Restart the system call - no handlers present */
718 if (regs->regs[REG_RET] == -ERESTARTNOHAND ||
719 regs->regs[REG_RET] == -ERESTARTSYS ||
720 regs->regs[REG_RET] == -ERESTARTNOINTR) {
721 /* Decode Syscall # */
722 regs->regs[REG_RET] = regs->syscall_nr;
723 regs->pc -= 4;
724 }
725 }
726 return 0;
727}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-17 11:32:46 -0500