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Linux-2.6.12-rc2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc64 / kernel / signal.c
1 /* $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11 #include <linux/config.h>
12 #ifdef CONFIG_SPARC32_COMPAT
13 #include <linux/compat.h> /* for compat_old_sigset_t */
14 #endif
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/smp_lock.h>
25 #include <linux/binfmts.h>
26 #include <linux/bitops.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/svr4.h>
31 #include <asm/pgtable.h>
32 #include <asm/fpumacro.h>
33 #include <asm/uctx.h>
34 #include <asm/siginfo.h>
35 #include <asm/visasm.h>
36
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38
39 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
40 unsigned long orig_o0, int ret_from_syscall);
41
42 /* {set, get}context() needed for 64-bit SparcLinux userland. */
43 asmlinkage void sparc64_set_context(struct pt_regs *regs)
44 {
45 struct ucontext __user *ucp = (struct ucontext __user *)
46 regs->u_regs[UREG_I0];
47 mc_gregset_t __user *grp;
48 unsigned long pc, npc, tstate;
49 unsigned long fp, i7;
50 unsigned char fenab;
51 int err;
52
53 flush_user_windows();
54 if (get_thread_wsaved() ||
55 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
56 (!__access_ok(ucp, sizeof(*ucp))))
57 goto do_sigsegv;
58 grp = &ucp->uc_mcontext.mc_gregs;
59 err = __get_user(pc, &((*grp)[MC_PC]));
60 err |= __get_user(npc, &((*grp)[MC_NPC]));
61 if (err || ((pc | npc) & 3))
62 goto do_sigsegv;
63 if (regs->u_regs[UREG_I1]) {
64 sigset_t set;
65
66 if (_NSIG_WORDS == 1) {
67 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
68 goto do_sigsegv;
69 } else {
70 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
71 goto do_sigsegv;
72 }
73 sigdelsetmask(&set, ~_BLOCKABLE);
74 spin_lock_irq(&current->sighand->siglock);
75 current->blocked = set;
76 recalc_sigpending();
77 spin_unlock_irq(&current->sighand->siglock);
78 }
79 if (test_thread_flag(TIF_32BIT)) {
80 pc &= 0xffffffff;
81 npc &= 0xffffffff;
82 }
83 regs->tpc = pc;
84 regs->tnpc = npc;
85 err |= __get_user(regs->y, &((*grp)[MC_Y]));
86 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
87 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
88 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
89 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
90 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
91 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
92 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
93 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
94 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
95 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
96 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
97 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
98 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
99 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
100 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
101 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
102 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
103 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
104
105 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
106 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
107 err |= __put_user(fp,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
109 err |= __put_user(i7,
110 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
111
112 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
113 if (fenab) {
114 unsigned long *fpregs = current_thread_info()->fpregs;
115 unsigned long fprs;
116
117 fprs_write(0);
118 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
119 if (fprs & FPRS_DL)
120 err |= copy_from_user(fpregs,
121 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
122 (sizeof(unsigned int) * 32));
123 if (fprs & FPRS_DU)
124 err |= copy_from_user(fpregs+16,
125 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
126 (sizeof(unsigned int) * 32));
127 err |= __get_user(current_thread_info()->xfsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
129 err |= __get_user(current_thread_info()->gsr[0],
130 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
131 regs->tstate &= ~TSTATE_PEF;
132 }
133 if (err)
134 goto do_sigsegv;
135
136 return;
137 do_sigsegv:
138 force_sig(SIGSEGV, current);
139 }
140
141 asmlinkage void sparc64_get_context(struct pt_regs *regs)
142 {
143 struct ucontext __user *ucp = (struct ucontext __user *)
144 regs->u_regs[UREG_I0];
145 mc_gregset_t __user *grp;
146 mcontext_t __user *mcp;
147 unsigned long fp, i7;
148 unsigned char fenab;
149 int err;
150
151 synchronize_user_stack();
152 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
153 goto do_sigsegv;
154
155 #if 1
156 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
157 #else
158 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
159 #endif
160
161 mcp = &ucp->uc_mcontext;
162 grp = &mcp->mc_gregs;
163
164 /* Skip over the trap instruction, first. */
165 if (test_thread_flag(TIF_32BIT)) {
166 regs->tpc = (regs->tnpc & 0xffffffff);
167 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
168 } else {
169 regs->tpc = regs->tnpc;
170 regs->tnpc += 4;
171 }
172 err = 0;
173 if (_NSIG_WORDS == 1)
174 err |= __put_user(current->blocked.sig[0],
175 (unsigned long __user *)&ucp->uc_sigmask);
176 else
177 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
178 sizeof(sigset_t));
179
180 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
181 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
182 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
183 err |= __put_user(regs->y, &((*grp)[MC_Y]));
184 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
185 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
186 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
187 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
188 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
189 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
190 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
191 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
192 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
193 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
194 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
195 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
196 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
197 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
198 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
199
200 err |= __get_user(fp,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
202 err |= __get_user(i7,
203 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
204 err |= __put_user(fp, &(mcp->mc_fp));
205 err |= __put_user(i7, &(mcp->mc_i7));
206
207 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
208 if (fenab) {
209 unsigned long *fpregs = current_thread_info()->fpregs;
210 unsigned long fprs;
211
212 fprs = current_thread_info()->fpsaved[0];
213 if (fprs & FPRS_DL)
214 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
215 (sizeof(unsigned int) * 32));
216 if (fprs & FPRS_DU)
217 err |= copy_to_user(
218 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
219 (sizeof(unsigned int) * 32));
220 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
221 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
222 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
223 }
224 if (err)
225 goto do_sigsegv;
226
227 return;
228 do_sigsegv:
229 force_sig(SIGSEGV, current);
230 }
231
232 struct rt_signal_frame {
233 struct sparc_stackf ss;
234 siginfo_t info;
235 struct pt_regs regs;
236 __siginfo_fpu_t __user *fpu_save;
237 stack_t stack;
238 sigset_t mask;
239 __siginfo_fpu_t fpu_state;
240 };
241
242 /* Align macros */
243 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
244
245 /*
246 * atomically swap in the new signal mask, and wait for a signal.
247 * This is really tricky on the Sparc, watch out...
248 */
249 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
250 {
251 sigset_t saveset;
252
253 #ifdef CONFIG_SPARC32_COMPAT
254 if (test_thread_flag(TIF_32BIT)) {
255 extern asmlinkage void _sigpause32_common(compat_old_sigset_t,
256 struct pt_regs *);
257 _sigpause32_common(set, regs);
258 return;
259 }
260 #endif
261 set &= _BLOCKABLE;
262 spin_lock_irq(&current->sighand->siglock);
263 saveset = current->blocked;
264 siginitset(&current->blocked, set);
265 recalc_sigpending();
266 spin_unlock_irq(&current->sighand->siglock);
267
268 if (test_thread_flag(TIF_32BIT)) {
269 regs->tpc = (regs->tnpc & 0xffffffff);
270 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
271 } else {
272 regs->tpc = regs->tnpc;
273 regs->tnpc += 4;
274 }
275
276 /* Condition codes and return value where set here for sigpause,
277 * and so got used by setup_frame, which again causes sigreturn()
278 * to return -EINTR.
279 */
280 while (1) {
281 current->state = TASK_INTERRUPTIBLE;
282 schedule();
283 /*
284 * Return -EINTR and set condition code here,
285 * so the interrupted system call actually returns
286 * these.
287 */
288 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
289 regs->u_regs[UREG_I0] = EINTR;
290 if (do_signal(&saveset, regs, 0, 0))
291 return;
292 }
293 }
294
295 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
296 {
297 _sigpause_common(set, regs);
298 }
299
300 asmlinkage void do_sigsuspend(struct pt_regs *regs)
301 {
302 _sigpause_common(regs->u_regs[UREG_I0], regs);
303 }
304
305 asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs)
306 {
307 sigset_t oldset, set;
308
309 /* XXX: Don't preclude handling different sized sigset_t's. */
310 if (sigsetsize != sizeof(sigset_t)) {
311 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
312 regs->u_regs[UREG_I0] = EINVAL;
313 return;
314 }
315 if (copy_from_user(&set, uset, sizeof(set))) {
316 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
317 regs->u_regs[UREG_I0] = EFAULT;
318 return;
319 }
320
321 sigdelsetmask(&set, ~_BLOCKABLE);
322 spin_lock_irq(&current->sighand->siglock);
323 oldset = current->blocked;
324 current->blocked = set;
325 recalc_sigpending();
326 spin_unlock_irq(&current->sighand->siglock);
327
328 if (test_thread_flag(TIF_32BIT)) {
329 regs->tpc = (regs->tnpc & 0xffffffff);
330 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
331 } else {
332 regs->tpc = regs->tnpc;
333 regs->tnpc += 4;
334 }
335
336 /* Condition codes and return value where set here for sigpause,
337 * and so got used by setup_frame, which again causes sigreturn()
338 * to return -EINTR.
339 */
340 while (1) {
341 current->state = TASK_INTERRUPTIBLE;
342 schedule();
343 /*
344 * Return -EINTR and set condition code here,
345 * so the interrupted system call actually returns
346 * these.
347 */
348 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
349 regs->u_regs[UREG_I0] = EINTR;
350 if (do_signal(&oldset, regs, 0, 0))
351 return;
352 }
353 }
354
355 static inline int
356 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
357 {
358 unsigned long *fpregs = current_thread_info()->fpregs;
359 unsigned long fprs;
360 int err;
361
362 err = __get_user(fprs, &fpu->si_fprs);
363 fprs_write(0);
364 regs->tstate &= ~TSTATE_PEF;
365 if (fprs & FPRS_DL)
366 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
367 (sizeof(unsigned int) * 32));
368 if (fprs & FPRS_DU)
369 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
370 (sizeof(unsigned int) * 32));
371 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
372 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
373 current_thread_info()->fpsaved[0] |= fprs;
374 return err;
375 }
376
377 void do_rt_sigreturn(struct pt_regs *regs)
378 {
379 struct rt_signal_frame __user *sf;
380 unsigned long tpc, tnpc, tstate;
381 __siginfo_fpu_t __user *fpu_save;
382 mm_segment_t old_fs;
383 sigset_t set;
384 stack_t st;
385 int err;
386
387 /* Always make any pending restarted system calls return -EINTR */
388 current_thread_info()->restart_block.fn = do_no_restart_syscall;
389
390 synchronize_user_stack ();
391 sf = (struct rt_signal_frame __user *)
392 (regs->u_regs [UREG_FP] + STACK_BIAS);
393
394 /* 1. Make sure we are not getting garbage from the user */
395 if (((unsigned long) sf) & 3)
396 goto segv;
397
398 err = get_user(tpc, &sf->regs.tpc);
399 err |= __get_user(tnpc, &sf->regs.tnpc);
400 if (test_thread_flag(TIF_32BIT)) {
401 tpc &= 0xffffffff;
402 tnpc &= 0xffffffff;
403 }
404 err |= ((tpc | tnpc) & 3);
405
406 /* 2. Restore the state */
407 err |= __get_user(regs->y, &sf->regs.y);
408 err |= __get_user(tstate, &sf->regs.tstate);
409 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
410
411 /* User can only change condition codes and %asi in %tstate. */
412 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
413 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
414
415 err |= __get_user(fpu_save, &sf->fpu_save);
416 if (fpu_save)
417 err |= restore_fpu_state(regs, &sf->fpu_state);
418
419 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
420 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
421
422 if (err)
423 goto segv;
424
425 regs->tpc = tpc;
426 regs->tnpc = tnpc;
427
428 /* It is more difficult to avoid calling this function than to
429 call it and ignore errors. */
430 old_fs = get_fs();
431 set_fs(KERNEL_DS);
432 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
433 set_fs(old_fs);
434
435 sigdelsetmask(&set, ~_BLOCKABLE);
436 spin_lock_irq(&current->sighand->siglock);
437 current->blocked = set;
438 recalc_sigpending();
439 spin_unlock_irq(&current->sighand->siglock);
440 return;
441 segv:
442 force_sig(SIGSEGV, current);
443 }
444
445 /* Checks if the fp is valid */
446 static int invalid_frame_pointer(void __user *fp, int fplen)
447 {
448 if (((unsigned long) fp) & 7)
449 return 1;
450 return 0;
451 }
452
453 static inline int
454 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
455 {
456 unsigned long *fpregs = (unsigned long *)(regs+1);
457 unsigned long fprs;
458 int err = 0;
459
460 fprs = current_thread_info()->fpsaved[0];
461 if (fprs & FPRS_DL)
462 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
463 (sizeof(unsigned int) * 32));
464 if (fprs & FPRS_DU)
465 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
466 (sizeof(unsigned int) * 32));
467 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
468 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
469 err |= __put_user(fprs, &fpu->si_fprs);
470
471 return err;
472 }
473
474 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
475 {
476 unsigned long sp;
477
478 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
479
480 /* This is the X/Open sanctioned signal stack switching. */
481 if (ka->sa.sa_flags & SA_ONSTACK) {
482 if (!on_sig_stack(sp) &&
483 !((current->sas_ss_sp + current->sas_ss_size) & 7))
484 sp = current->sas_ss_sp + current->sas_ss_size;
485 }
486 return (void __user *)(sp - framesize);
487 }
488
489 static inline void
490 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
491 int signo, sigset_t *oldset, siginfo_t *info)
492 {
493 struct rt_signal_frame __user *sf;
494 int sigframe_size, err;
495
496 /* 1. Make sure everything is clean */
497 synchronize_user_stack();
498 save_and_clear_fpu();
499
500 sigframe_size = RT_ALIGNEDSZ;
501 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
502 sigframe_size -= sizeof(__siginfo_fpu_t);
503
504 sf = (struct rt_signal_frame __user *)
505 get_sigframe(ka, regs, sigframe_size);
506
507 if (invalid_frame_pointer (sf, sigframe_size))
508 goto sigill;
509
510 if (get_thread_wsaved() != 0)
511 goto sigill;
512
513 /* 2. Save the current process state */
514 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
515
516 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
517 err |= save_fpu_state(regs, &sf->fpu_state);
518 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
519 } else {
520 err |= __put_user(0, &sf->fpu_save);
521 }
522
523 /* Setup sigaltstack */
524 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
525 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
526 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
527
528 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
529
530 err |= copy_in_user((u64 __user *)sf,
531 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
532 sizeof(struct reg_window));
533
534 if (info)
535 err |= copy_siginfo_to_user(&sf->info, info);
536 else {
537 err |= __put_user(signo, &sf->info.si_signo);
538 err |= __put_user(SI_NOINFO, &sf->info.si_code);
539 }
540 if (err)
541 goto sigsegv;
542
543 /* 3. signal handler back-trampoline and parameters */
544 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
545 regs->u_regs[UREG_I0] = signo;
546 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
547
548 /* The sigcontext is passed in this way because of how it
549 * is defined in GLIBC's /usr/include/bits/sigcontext.h
550 * for sparc64. It includes the 128 bytes of siginfo_t.
551 */
552 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
553
554 /* 5. signal handler */
555 regs->tpc = (unsigned long) ka->sa.sa_handler;
556 regs->tnpc = (regs->tpc + 4);
557 if (test_thread_flag(TIF_32BIT)) {
558 regs->tpc &= 0xffffffff;
559 regs->tnpc &= 0xffffffff;
560 }
561 /* 4. return to kernel instructions */
562 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
563 return;
564
565 sigill:
566 do_exit(SIGILL);
567 sigsegv:
568 force_sigsegv(signo, current);
569 }
570
571 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
572 siginfo_t *info,
573 sigset_t *oldset, struct pt_regs *regs)
574 {
575 setup_rt_frame(ka, regs, signr, oldset,
576 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
577 if (!(ka->sa.sa_flags & SA_NOMASK)) {
578 spin_lock_irq(&current->sighand->siglock);
579 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
580 sigaddset(&current->blocked,signr);
581 recalc_sigpending();
582 spin_unlock_irq(&current->sighand->siglock);
583 }
584 }
585
586 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
587 struct sigaction *sa)
588 {
589 switch (regs->u_regs[UREG_I0]) {
590 case ERESTART_RESTARTBLOCK:
591 case ERESTARTNOHAND:
592 no_system_call_restart:
593 regs->u_regs[UREG_I0] = EINTR;
594 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
595 break;
596 case ERESTARTSYS:
597 if (!(sa->sa_flags & SA_RESTART))
598 goto no_system_call_restart;
599 /* fallthrough */
600 case ERESTARTNOINTR:
601 regs->u_regs[UREG_I0] = orig_i0;
602 regs->tpc -= 4;
603 regs->tnpc -= 4;
604 }
605 }
606
607 /* Note that 'init' is a special process: it doesn't get signals it doesn't
608 * want to handle. Thus you cannot kill init even with a SIGKILL even by
609 * mistake.
610 */
611 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
612 unsigned long orig_i0, int restart_syscall)
613 {
614 siginfo_t info;
615 struct signal_deliver_cookie cookie;
616 struct k_sigaction ka;
617 int signr;
618
619 cookie.restart_syscall = restart_syscall;
620 cookie.orig_i0 = orig_i0;
621
622 if (!oldset)
623 oldset = &current->blocked;
624
625 #ifdef CONFIG_SPARC32_COMPAT
626 if (test_thread_flag(TIF_32BIT)) {
627 extern int do_signal32(sigset_t *, struct pt_regs *,
628 unsigned long, int);
629 return do_signal32(oldset, regs, orig_i0,
630 cookie.restart_syscall);
631 }
632 #endif
633
634 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
635 if (signr > 0) {
636 if (cookie.restart_syscall)
637 syscall_restart(orig_i0, regs, &ka.sa);
638 handle_signal(signr, &ka, &info, oldset, regs);
639 return 1;
640 }
641 if (cookie.restart_syscall &&
642 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
643 regs->u_regs[UREG_I0] == ERESTARTSYS ||
644 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
645 /* replay the system call when we are done */
646 regs->u_regs[UREG_I0] = cookie.orig_i0;
647 regs->tpc -= 4;
648 regs->tnpc -= 4;
649 }
650 if (cookie.restart_syscall &&
651 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
652 regs->u_regs[UREG_G1] = __NR_restart_syscall;
653 regs->tpc -= 4;
654 regs->tnpc -= 4;
655 }
656 return 0;
657 }
658
659 void do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
660 unsigned long orig_i0, int restart_syscall,
661 unsigned long thread_info_flags)
662 {
663 if (thread_info_flags & _TIF_SIGPENDING)
664 do_signal(oldset, regs, orig_i0, restart_syscall);
665 }
666
667 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
668 {
669 struct signal_deliver_cookie *cp = cookie;
670
671 if (cp->restart_syscall &&
672 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
673 regs->u_regs[UREG_I0] == ERESTARTSYS ||
674 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
675 /* replay the system call when we are done */
676 regs->u_regs[UREG_I0] = cp->orig_i0;
677 regs->tpc -= 4;
678 regs->tnpc -= 4;
679 cp->restart_syscall = 0;
680 }
681 if (cp->restart_syscall &&
682 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
683 regs->u_regs[UREG_G1] = __NR_restart_syscall;
684 regs->tpc -= 4;
685 regs->tnpc -= 4;
686 cp->restart_syscall = 0;
687 }
688 }
kernel source for telekom puls (alcatel/mediatek)