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1da177e4 LT |
1 | /* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $ |
2 | * linux/arch/sparc/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 | */ | |
9 | ||
10 | #include <linux/config.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/signal.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/unistd.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/tty.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/binfmts.h> /* do_coredum */ | |
23 | #include <linux/bitops.h> | |
24 | ||
25 | #include <asm/uaccess.h> | |
26 | #include <asm/ptrace.h> | |
27 | #include <asm/svr4.h> | |
28 | #include <asm/pgalloc.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/cacheflush.h> /* flush_sig_insns */ | |
31 | ||
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
33 | ||
34 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, | |
35 | void *fpqueue, unsigned long *fpqdepth); | |
36 | extern void fpload(unsigned long *fpregs, unsigned long *fsr); | |
37 | ||
38 | asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, | |
39 | unsigned long orig_o0, int restart_syscall); | |
40 | ||
41 | /* Signal frames: the original one (compatible with SunOS): | |
42 | * | |
43 | * Set up a signal frame... Make the stack look the way SunOS | |
44 | * expects it to look which is basically: | |
45 | * | |
46 | * ---------------------------------- <-- %sp at signal time | |
47 | * Struct sigcontext | |
48 | * Signal address | |
49 | * Ptr to sigcontext area above | |
50 | * Signal code | |
51 | * The signal number itself | |
52 | * One register window | |
53 | * ---------------------------------- <-- New %sp | |
54 | */ | |
55 | struct signal_sframe { | |
56 | struct reg_window sig_window; | |
57 | int sig_num; | |
58 | int sig_code; | |
59 | struct sigcontext __user *sig_scptr; | |
60 | int sig_address; | |
61 | struct sigcontext sig_context; | |
62 | unsigned int extramask[_NSIG_WORDS - 1]; | |
63 | }; | |
64 | ||
65 | /* | |
66 | * And the new one, intended to be used for Linux applications only | |
67 | * (we have enough in there to work with clone). | |
68 | * All the interesting bits are in the info field. | |
69 | */ | |
70 | ||
71 | struct new_signal_frame { | |
72 | struct sparc_stackf ss; | |
73 | __siginfo_t info; | |
74 | __siginfo_fpu_t __user *fpu_save; | |
75 | unsigned long insns[2] __attribute__ ((aligned (8))); | |
76 | unsigned int extramask[_NSIG_WORDS - 1]; | |
77 | unsigned int extra_size; /* Should be 0 */ | |
78 | __siginfo_fpu_t fpu_state; | |
79 | }; | |
80 | ||
81 | struct rt_signal_frame { | |
82 | struct sparc_stackf ss; | |
83 | siginfo_t info; | |
84 | struct pt_regs regs; | |
85 | sigset_t mask; | |
86 | __siginfo_fpu_t __user *fpu_save; | |
87 | unsigned int insns[2]; | |
88 | stack_t stack; | |
89 | unsigned int extra_size; /* Should be 0 */ | |
90 | __siginfo_fpu_t fpu_state; | |
91 | }; | |
92 | ||
93 | /* Align macros */ | |
94 | #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) | |
95 | #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7))) | |
96 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) | |
97 | ||
98 | /* | |
99 | * atomically swap in the new signal mask, and wait for a signal. | |
100 | * This is really tricky on the Sparc, watch out... | |
101 | */ | |
102 | asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs) | |
103 | { | |
104 | sigset_t saveset; | |
105 | ||
106 | set &= _BLOCKABLE; | |
107 | spin_lock_irq(¤t->sighand->siglock); | |
108 | saveset = current->blocked; | |
109 | siginitset(¤t->blocked, set); | |
110 | recalc_sigpending(); | |
111 | spin_unlock_irq(¤t->sighand->siglock); | |
112 | ||
113 | regs->pc = regs->npc; | |
114 | regs->npc += 4; | |
115 | ||
116 | /* Condition codes and return value where set here for sigpause, | |
117 | * and so got used by setup_frame, which again causes sigreturn() | |
118 | * to return -EINTR. | |
119 | */ | |
120 | while (1) { | |
121 | current->state = TASK_INTERRUPTIBLE; | |
122 | schedule(); | |
123 | /* | |
124 | * Return -EINTR and set condition code here, | |
125 | * so the interrupted system call actually returns | |
126 | * these. | |
127 | */ | |
128 | regs->psr |= PSR_C; | |
129 | regs->u_regs[UREG_I0] = EINTR; | |
130 | if (do_signal(&saveset, regs, 0, 0)) | |
131 | return; | |
132 | } | |
133 | } | |
134 | ||
135 | asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs) | |
136 | { | |
137 | _sigpause_common(set, regs); | |
138 | } | |
139 | ||
140 | asmlinkage void do_sigsuspend (struct pt_regs *regs) | |
141 | { | |
142 | _sigpause_common(regs->u_regs[UREG_I0], regs); | |
143 | } | |
144 | ||
145 | asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, | |
146 | struct pt_regs *regs) | |
147 | { | |
148 | sigset_t oldset, set; | |
149 | ||
150 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
151 | if (sigsetsize != sizeof(sigset_t)) { | |
152 | regs->psr |= PSR_C; | |
153 | regs->u_regs[UREG_I0] = EINVAL; | |
154 | return; | |
155 | } | |
156 | ||
157 | if (copy_from_user(&set, uset, sizeof(set))) { | |
158 | regs->psr |= PSR_C; | |
159 | regs->u_regs[UREG_I0] = EFAULT; | |
160 | return; | |
161 | } | |
162 | ||
163 | sigdelsetmask(&set, ~_BLOCKABLE); | |
164 | spin_lock_irq(¤t->sighand->siglock); | |
165 | oldset = current->blocked; | |
166 | current->blocked = set; | |
167 | recalc_sigpending(); | |
168 | spin_unlock_irq(¤t->sighand->siglock); | |
169 | ||
170 | regs->pc = regs->npc; | |
171 | regs->npc += 4; | |
172 | ||
173 | /* Condition codes and return value where set here for sigpause, | |
174 | * and so got used by setup_frame, which again causes sigreturn() | |
175 | * to return -EINTR. | |
176 | */ | |
177 | while (1) { | |
178 | current->state = TASK_INTERRUPTIBLE; | |
179 | schedule(); | |
180 | /* | |
181 | * Return -EINTR and set condition code here, | |
182 | * so the interrupted system call actually returns | |
183 | * these. | |
184 | */ | |
185 | regs->psr |= PSR_C; | |
186 | regs->u_regs[UREG_I0] = EINTR; | |
187 | if (do_signal(&oldset, regs, 0, 0)) | |
188 | return; | |
189 | } | |
190 | } | |
191 | ||
192 | static inline int | |
193 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
194 | { | |
195 | int err; | |
196 | #ifdef CONFIG_SMP | |
197 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) | |
198 | regs->psr &= ~PSR_EF; | |
199 | #else | |
200 | if (current == last_task_used_math) { | |
201 | last_task_used_math = NULL; | |
202 | regs->psr &= ~PSR_EF; | |
203 | } | |
204 | #endif | |
205 | set_used_math(); | |
206 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
207 | ||
208 | if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) | |
209 | return -EFAULT; | |
210 | ||
211 | err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], | |
212 | (sizeof(unsigned long) * 32)); | |
213 | err |= __get_user(current->thread.fsr, &fpu->si_fsr); | |
214 | err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
215 | if (current->thread.fpqdepth != 0) | |
216 | err |= __copy_from_user(¤t->thread.fpqueue[0], | |
217 | &fpu->si_fpqueue[0], | |
218 | ((sizeof(unsigned long) + | |
219 | (sizeof(unsigned long *)))*16)); | |
220 | return err; | |
221 | } | |
222 | ||
223 | static inline void do_new_sigreturn (struct pt_regs *regs) | |
224 | { | |
225 | struct new_signal_frame __user *sf; | |
226 | unsigned long up_psr, pc, npc; | |
227 | sigset_t set; | |
228 | __siginfo_fpu_t __user *fpu_save; | |
229 | int err; | |
230 | ||
231 | sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP]; | |
232 | ||
233 | /* 1. Make sure we are not getting garbage from the user */ | |
234 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf))) | |
235 | goto segv_and_exit; | |
236 | ||
237 | if (((unsigned long) sf) & 3) | |
238 | goto segv_and_exit; | |
239 | ||
240 | err = __get_user(pc, &sf->info.si_regs.pc); | |
241 | err |= __get_user(npc, &sf->info.si_regs.npc); | |
242 | ||
243 | if ((pc | npc) & 3) | |
244 | goto segv_and_exit; | |
245 | ||
246 | /* 2. Restore the state */ | |
247 | up_psr = regs->psr; | |
248 | err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs)); | |
249 | ||
250 | /* User can only change condition codes and FPU enabling in %psr. */ | |
251 | regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) | |
252 | | (regs->psr & (PSR_ICC | PSR_EF)); | |
253 | ||
254 | err |= __get_user(fpu_save, &sf->fpu_save); | |
255 | ||
256 | if (fpu_save) | |
257 | err |= restore_fpu_state(regs, fpu_save); | |
258 | ||
259 | /* This is pretty much atomic, no amount locking would prevent | |
260 | * the races which exist anyways. | |
261 | */ | |
262 | err |= __get_user(set.sig[0], &sf->info.si_mask); | |
263 | err |= __copy_from_user(&set.sig[1], &sf->extramask, | |
264 | (_NSIG_WORDS-1) * sizeof(unsigned int)); | |
265 | ||
266 | if (err) | |
267 | goto segv_and_exit; | |
268 | ||
269 | sigdelsetmask(&set, ~_BLOCKABLE); | |
270 | spin_lock_irq(¤t->sighand->siglock); | |
271 | current->blocked = set; | |
272 | recalc_sigpending(); | |
273 | spin_unlock_irq(¤t->sighand->siglock); | |
274 | return; | |
275 | ||
276 | segv_and_exit: | |
277 | force_sig(SIGSEGV, current); | |
278 | } | |
279 | ||
280 | asmlinkage void do_sigreturn(struct pt_regs *regs) | |
281 | { | |
282 | struct sigcontext __user *scptr; | |
283 | unsigned long pc, npc, psr; | |
284 | sigset_t set; | |
285 | int err; | |
286 | ||
287 | /* Always make any pending restarted system calls return -EINTR */ | |
288 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
289 | ||
290 | synchronize_user_stack(); | |
291 | ||
292 | if (current->thread.new_signal) { | |
293 | do_new_sigreturn(regs); | |
294 | return; | |
295 | } | |
296 | ||
297 | scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0]; | |
298 | ||
299 | /* Check sanity of the user arg. */ | |
300 | if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) || | |
301 | (((unsigned long) scptr) & 3)) | |
302 | goto segv_and_exit; | |
303 | ||
304 | err = __get_user(pc, &scptr->sigc_pc); | |
305 | err |= __get_user(npc, &scptr->sigc_npc); | |
306 | ||
307 | if ((pc | npc) & 3) | |
308 | goto segv_and_exit; | |
309 | ||
310 | /* This is pretty much atomic, no amount locking would prevent | |
311 | * the races which exist anyways. | |
312 | */ | |
313 | err |= __get_user(set.sig[0], &scptr->sigc_mask); | |
314 | /* Note that scptr + 1 points to extramask */ | |
315 | err |= __copy_from_user(&set.sig[1], scptr + 1, | |
316 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
317 | ||
318 | if (err) | |
319 | goto segv_and_exit; | |
320 | ||
321 | sigdelsetmask(&set, ~_BLOCKABLE); | |
322 | spin_lock_irq(¤t->sighand->siglock); | |
323 | current->blocked = set; | |
324 | recalc_sigpending(); | |
325 | spin_unlock_irq(¤t->sighand->siglock); | |
326 | ||
327 | regs->pc = pc; | |
328 | regs->npc = npc; | |
329 | ||
330 | err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); | |
331 | err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); | |
332 | err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); | |
333 | ||
334 | /* User can only change condition codes in %psr. */ | |
335 | err |= __get_user(psr, &scptr->sigc_psr); | |
336 | if (err) | |
337 | goto segv_and_exit; | |
338 | ||
339 | regs->psr &= ~(PSR_ICC); | |
340 | regs->psr |= (psr & PSR_ICC); | |
341 | return; | |
342 | ||
343 | segv_and_exit: | |
344 | force_sig(SIGSEGV, current); | |
345 | } | |
346 | ||
347 | asmlinkage void do_rt_sigreturn(struct pt_regs *regs) | |
348 | { | |
349 | struct rt_signal_frame __user *sf; | |
350 | unsigned int psr, pc, npc; | |
351 | __siginfo_fpu_t __user *fpu_save; | |
352 | mm_segment_t old_fs; | |
353 | sigset_t set; | |
354 | stack_t st; | |
355 | int err; | |
356 | ||
357 | synchronize_user_stack(); | |
358 | sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; | |
359 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
360 | (((unsigned long) sf) & 0x03)) | |
361 | goto segv; | |
362 | ||
363 | err = __get_user(pc, &sf->regs.pc); | |
364 | err |= __get_user(npc, &sf->regs.npc); | |
365 | err |= ((pc | npc) & 0x03); | |
366 | ||
367 | err |= __get_user(regs->y, &sf->regs.y); | |
368 | err |= __get_user(psr, &sf->regs.psr); | |
369 | ||
370 | err |= __copy_from_user(®s->u_regs[UREG_G1], | |
371 | &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32)); | |
372 | ||
373 | regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); | |
374 | ||
375 | err |= __get_user(fpu_save, &sf->fpu_save); | |
376 | ||
377 | if (fpu_save) | |
378 | err |= restore_fpu_state(regs, fpu_save); | |
379 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
380 | ||
381 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); | |
382 | ||
383 | if (err) | |
384 | goto segv; | |
385 | ||
386 | regs->pc = pc; | |
387 | regs->npc = npc; | |
388 | ||
389 | /* It is more difficult to avoid calling this function than to | |
390 | * call it and ignore errors. | |
391 | */ | |
392 | old_fs = get_fs(); | |
393 | set_fs(KERNEL_DS); | |
394 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); | |
395 | set_fs(old_fs); | |
396 | ||
397 | sigdelsetmask(&set, ~_BLOCKABLE); | |
398 | spin_lock_irq(¤t->sighand->siglock); | |
399 | current->blocked = set; | |
400 | recalc_sigpending(); | |
401 | spin_unlock_irq(¤t->sighand->siglock); | |
402 | return; | |
403 | segv: | |
404 | force_sig(SIGSEGV, current); | |
405 | } | |
406 | ||
407 | /* Checks if the fp is valid */ | |
408 | static inline int invalid_frame_pointer(void __user *fp, int fplen) | |
409 | { | |
410 | if ((((unsigned long) fp) & 7) || | |
411 | !__access_ok((unsigned long)fp, fplen) || | |
412 | ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && | |
413 | ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) | |
414 | return 1; | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) | |
420 | { | |
421 | unsigned long sp; | |
422 | ||
423 | sp = regs->u_regs[UREG_FP]; | |
424 | ||
425 | /* This is the X/Open sanctioned signal stack switching. */ | |
426 | if (sa->sa_flags & SA_ONSTACK) { | |
427 | if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
428 | sp = current->sas_ss_sp + current->sas_ss_size; | |
429 | } | |
430 | return (void __user *)(sp - framesize); | |
431 | } | |
432 | ||
433 | static inline void | |
434 | setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) | |
435 | { | |
436 | struct signal_sframe __user *sframep; | |
437 | struct sigcontext __user *sc; | |
438 | int window = 0, err; | |
439 | unsigned long pc = regs->pc; | |
440 | unsigned long npc = regs->npc; | |
441 | struct thread_info *tp = current_thread_info(); | |
442 | void __user *sig_address; | |
443 | int sig_code; | |
444 | ||
445 | synchronize_user_stack(); | |
446 | sframep = (struct signal_sframe __user *) | |
447 | get_sigframe(sa, regs, SF_ALIGNEDSZ); | |
448 | if (invalid_frame_pointer(sframep, sizeof(*sframep))){ | |
449 | /* Don't change signal code and address, so that | |
450 | * post mortem debuggers can have a look. | |
451 | */ | |
452 | goto sigill_and_return; | |
453 | } | |
454 | ||
455 | sc = &sframep->sig_context; | |
456 | ||
457 | /* We've already made sure frame pointer isn't in kernel space... */ | |
458 | err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), | |
459 | &sc->sigc_onstack); | |
460 | err |= __put_user(oldset->sig[0], &sc->sigc_mask); | |
461 | err |= __copy_to_user(sframep->extramask, &oldset->sig[1], | |
462 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
463 | err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); | |
464 | err |= __put_user(pc, &sc->sigc_pc); | |
465 | err |= __put_user(npc, &sc->sigc_npc); | |
466 | err |= __put_user(regs->psr, &sc->sigc_psr); | |
467 | err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); | |
468 | err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); | |
469 | err |= __put_user(tp->w_saved, &sc->sigc_oswins); | |
470 | if (tp->w_saved) | |
471 | for (window = 0; window < tp->w_saved; window++) { | |
472 | put_user((char *)tp->rwbuf_stkptrs[window], | |
473 | &sc->sigc_spbuf[window]); | |
474 | err |= __copy_to_user(&sc->sigc_wbuf[window], | |
475 | &tp->reg_window[window], | |
476 | sizeof(struct reg_window)); | |
477 | } | |
478 | else | |
479 | err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP], | |
480 | sizeof(struct reg_window)); | |
481 | ||
482 | tp->w_saved = 0; /* So process is allowed to execute. */ | |
483 | ||
484 | err |= __put_user(signr, &sframep->sig_num); | |
485 | sig_address = NULL; | |
486 | sig_code = 0; | |
487 | if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { | |
488 | sig_address = info->si_addr; | |
489 | switch (signr) { | |
490 | case SIGSEGV: | |
491 | switch (info->si_code) { | |
492 | case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; | |
493 | default: sig_code = SUBSIG_PROTECTION; break; | |
494 | } | |
495 | break; | |
496 | case SIGILL: | |
497 | switch (info->si_code) { | |
498 | case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; | |
499 | case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; | |
500 | case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break; | |
501 | default: sig_code = SUBSIG_STACK; break; | |
502 | } | |
503 | break; | |
504 | case SIGFPE: | |
505 | switch (info->si_code) { | |
506 | case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; | |
507 | case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; | |
508 | case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; | |
509 | case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; | |
510 | case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; | |
511 | case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; | |
512 | case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; | |
513 | default: sig_code = SUBSIG_FPERROR; break; | |
514 | } | |
515 | break; | |
516 | case SIGBUS: | |
517 | switch (info->si_code) { | |
518 | case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; | |
519 | case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; | |
520 | default: sig_code = SUBSIG_BUSTIMEOUT; break; | |
521 | } | |
522 | break; | |
523 | case SIGEMT: | |
524 | switch (info->si_code) { | |
525 | case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; | |
526 | } | |
527 | break; | |
528 | case SIGSYS: | |
529 | if (info->si_code == (__SI_FAULT|0x100)) { | |
530 | /* See sys_sunos.c */ | |
531 | sig_code = info->si_trapno; | |
532 | break; | |
533 | } | |
534 | default: | |
535 | sig_address = NULL; | |
536 | } | |
537 | } | |
538 | err |= __put_user((unsigned long)sig_address, &sframep->sig_address); | |
539 | err |= __put_user(sig_code, &sframep->sig_code); | |
540 | err |= __put_user(sc, &sframep->sig_scptr); | |
541 | if (err) | |
542 | goto sigsegv; | |
543 | ||
544 | regs->u_regs[UREG_FP] = (unsigned long) sframep; | |
545 | regs->pc = (unsigned long) sa->sa_handler; | |
546 | regs->npc = (regs->pc + 4); | |
547 | return; | |
548 | ||
549 | sigill_and_return: | |
550 | do_exit(SIGILL); | |
551 | sigsegv: | |
552 | force_sigsegv(signr, current); | |
553 | } | |
554 | ||
555 | ||
556 | static inline int | |
557 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
558 | { | |
559 | int err = 0; | |
560 | #ifdef CONFIG_SMP | |
561 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) { | |
562 | put_psr(get_psr() | PSR_EF); | |
563 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
564 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
565 | regs->psr &= ~(PSR_EF); | |
566 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
567 | } | |
568 | #else | |
569 | if (current == last_task_used_math) { | |
570 | put_psr(get_psr() | PSR_EF); | |
571 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
572 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
573 | last_task_used_math = NULL; | |
574 | regs->psr &= ~(PSR_EF); | |
575 | } | |
576 | #endif | |
577 | err |= __copy_to_user(&fpu->si_float_regs[0], | |
578 | ¤t->thread.float_regs[0], | |
579 | (sizeof(unsigned long) * 32)); | |
580 | err |= __put_user(current->thread.fsr, &fpu->si_fsr); | |
581 | err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
582 | if (current->thread.fpqdepth != 0) | |
583 | err |= __copy_to_user(&fpu->si_fpqueue[0], | |
584 | ¤t->thread.fpqueue[0], | |
585 | ((sizeof(unsigned long) + | |
586 | (sizeof(unsigned long *)))*16)); | |
587 | clear_used_math(); | |
588 | return err; | |
589 | } | |
590 | ||
591 | static inline void | |
592 | new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
593 | int signo, sigset_t *oldset) | |
594 | { | |
595 | struct new_signal_frame __user *sf; | |
596 | int sigframe_size, err; | |
597 | ||
598 | /* 1. Make sure everything is clean */ | |
599 | synchronize_user_stack(); | |
600 | ||
601 | sigframe_size = NF_ALIGNEDSZ; | |
602 | if (!used_math()) | |
603 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
604 | ||
605 | sf = (struct new_signal_frame __user *) | |
606 | get_sigframe(&ka->sa, regs, sigframe_size); | |
607 | ||
608 | if (invalid_frame_pointer(sf, sigframe_size)) | |
609 | goto sigill_and_return; | |
610 | ||
611 | if (current_thread_info()->w_saved != 0) | |
612 | goto sigill_and_return; | |
613 | ||
614 | /* 2. Save the current process state */ | |
615 | err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); | |
616 | ||
617 | err |= __put_user(0, &sf->extra_size); | |
618 | ||
619 | if (used_math()) { | |
620 | err |= save_fpu_state(regs, &sf->fpu_state); | |
621 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); | |
622 | } else { | |
623 | err |= __put_user(0, &sf->fpu_save); | |
624 | } | |
625 | ||
626 | err |= __put_user(oldset->sig[0], &sf->info.si_mask); | |
627 | err |= __copy_to_user(sf->extramask, &oldset->sig[1], | |
628 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
629 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
630 | sizeof(struct reg_window)); | |
631 | if (err) | |
632 | goto sigsegv; | |
633 | ||
634 | /* 3. signal handler back-trampoline and parameters */ | |
635 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
636 | regs->u_regs[UREG_I0] = signo; | |
637 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
638 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
639 | ||
640 | /* 4. signal handler */ | |
641 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
642 | regs->npc = (regs->pc + 4); | |
643 | ||
644 | /* 5. return to kernel instructions */ | |
645 | if (ka->ka_restorer) | |
646 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
647 | else { | |
648 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
649 | ||
650 | /* mov __NR_sigreturn, %g1 */ | |
651 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
652 | ||
653 | /* t 0x10 */ | |
654 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
655 | if (err) | |
656 | goto sigsegv; | |
657 | ||
658 | /* Flush instruction space. */ | |
659 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
660 | } | |
661 | return; | |
662 | ||
663 | sigill_and_return: | |
664 | do_exit(SIGILL); | |
665 | sigsegv: | |
666 | force_sigsegv(signo, current); | |
667 | } | |
668 | ||
669 | static inline void | |
670 | new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
671 | int signo, sigset_t *oldset, siginfo_t *info) | |
672 | { | |
673 | struct rt_signal_frame __user *sf; | |
674 | int sigframe_size; | |
675 | unsigned int psr; | |
676 | int err; | |
677 | ||
678 | synchronize_user_stack(); | |
679 | sigframe_size = RT_ALIGNEDSZ; | |
680 | if (!used_math()) | |
681 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
682 | sf = (struct rt_signal_frame __user *) | |
683 | get_sigframe(&ka->sa, regs, sigframe_size); | |
684 | if (invalid_frame_pointer(sf, sigframe_size)) | |
685 | goto sigill; | |
686 | if (current_thread_info()->w_saved != 0) | |
687 | goto sigill; | |
688 | ||
689 | err = __put_user(regs->pc, &sf->regs.pc); | |
690 | err |= __put_user(regs->npc, &sf->regs.npc); | |
691 | err |= __put_user(regs->y, &sf->regs.y); | |
692 | psr = regs->psr; | |
693 | if (used_math()) | |
694 | psr |= PSR_EF; | |
695 | err |= __put_user(psr, &sf->regs.psr); | |
696 | err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); | |
697 | err |= __put_user(0, &sf->extra_size); | |
698 | ||
699 | if (psr & PSR_EF) { | |
700 | err |= save_fpu_state(regs, &sf->fpu_state); | |
701 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); | |
702 | } else { | |
703 | err |= __put_user(0, &sf->fpu_save); | |
704 | } | |
705 | err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); | |
706 | ||
707 | /* Setup sigaltstack */ | |
708 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
709 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
710 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
711 | ||
712 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
713 | sizeof(struct reg_window)); | |
714 | ||
715 | err |= copy_siginfo_to_user(&sf->info, info); | |
716 | ||
717 | if (err) | |
718 | goto sigsegv; | |
719 | ||
720 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
721 | regs->u_regs[UREG_I0] = signo; | |
722 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
723 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
724 | ||
725 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
726 | regs->npc = (regs->pc + 4); | |
727 | ||
728 | if (ka->ka_restorer) | |
729 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
730 | else { | |
731 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
732 | ||
733 | /* mov __NR_sigreturn, %g1 */ | |
734 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
735 | ||
736 | /* t 0x10 */ | |
737 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
738 | if (err) | |
739 | goto sigsegv; | |
740 | ||
741 | /* Flush instruction space. */ | |
742 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
743 | } | |
744 | return; | |
745 | ||
746 | sigill: | |
747 | do_exit(SIGILL); | |
748 | sigsegv: | |
749 | force_sigsegv(signo, current); | |
750 | } | |
751 | ||
752 | /* Setup a Solaris stack frame */ | |
753 | static inline void | |
754 | setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, | |
755 | struct pt_regs *regs, int signr, sigset_t *oldset) | |
756 | { | |
757 | svr4_signal_frame_t __user *sfp; | |
758 | svr4_gregset_t __user *gr; | |
759 | svr4_siginfo_t __user *si; | |
760 | svr4_mcontext_t __user *mc; | |
761 | svr4_gwindows_t __user *gw; | |
762 | svr4_ucontext_t __user *uc; | |
763 | svr4_sigset_t setv; | |
764 | struct thread_info *tp = current_thread_info(); | |
765 | int window = 0, err; | |
766 | ||
767 | synchronize_user_stack(); | |
768 | sfp = (svr4_signal_frame_t __user *) | |
769 | get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window)); | |
770 | ||
771 | if (invalid_frame_pointer(sfp, sizeof(*sfp))) | |
772 | goto sigill_and_return; | |
773 | ||
774 | /* Start with a clean frame pointer and fill it */ | |
775 | err = __clear_user(sfp, sizeof(*sfp)); | |
776 | ||
777 | /* Setup convenience variables */ | |
778 | si = &sfp->si; | |
779 | uc = &sfp->uc; | |
780 | gw = &sfp->gw; | |
781 | mc = &uc->mcontext; | |
782 | gr = &mc->greg; | |
783 | ||
784 | /* FIXME: where am I supposed to put this? | |
785 | * sc->sigc_onstack = old_status; | |
786 | * anyways, it does not look like it is used for anything at all. | |
787 | */ | |
788 | setv.sigbits[0] = oldset->sig[0]; | |
789 | setv.sigbits[1] = oldset->sig[1]; | |
790 | if (_NSIG_WORDS >= 4) { | |
791 | setv.sigbits[2] = oldset->sig[2]; | |
792 | setv.sigbits[3] = oldset->sig[3]; | |
793 | err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); | |
794 | } else | |
795 | err |= __copy_to_user(&uc->sigmask, &setv, | |
796 | 2 * sizeof(unsigned int)); | |
797 | ||
798 | /* Store registers */ | |
799 | err |= __put_user(regs->pc, &((*gr)[SVR4_PC])); | |
800 | err |= __put_user(regs->npc, &((*gr)[SVR4_NPC])); | |
801 | err |= __put_user(regs->psr, &((*gr)[SVR4_PSR])); | |
802 | err |= __put_user(regs->y, &((*gr)[SVR4_Y])); | |
803 | ||
804 | /* Copy g[1..7] and o[0..7] registers */ | |
805 | err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], | |
806 | sizeof(long) * 7); | |
807 | err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], | |
808 | sizeof(long) * 8); | |
809 | ||
810 | /* Setup sigaltstack */ | |
811 | err |= __put_user(current->sas_ss_sp, &uc->stack.sp); | |
812 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); | |
813 | err |= __put_user(current->sas_ss_size, &uc->stack.size); | |
814 | ||
815 | /* Save the currently window file: */ | |
816 | ||
817 | /* 1. Link sfp->uc->gwins to our windows */ | |
818 | err |= __put_user(gw, &mc->gwin); | |
819 | ||
820 | /* 2. Number of windows to restore at setcontext(): */ | |
821 | err |= __put_user(tp->w_saved, &gw->count); | |
822 | ||
823 | /* 3. Save each valid window | |
824 | * Currently, it makes a copy of the windows from the kernel copy. | |
825 | * David's code for SunOS, makes the copy but keeps the pointer to | |
826 | * the kernel. My version makes the pointer point to a userland | |
827 | * copy of those. Mhm, I wonder if I shouldn't just ignore those | |
828 | * on setcontext and use those that are on the kernel, the signal | |
829 | * handler should not be modyfing those, mhm. | |
830 | * | |
831 | * These windows are just used in case synchronize_user_stack failed | |
832 | * to flush the user windows. | |
833 | */ | |
834 | for (window = 0; window < tp->w_saved; window++) { | |
835 | err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]); | |
836 | err |= __copy_to_user(&gw->win[window], | |
837 | &tp->reg_window[window], | |
838 | sizeof(svr4_rwindow_t)); | |
839 | err |= __put_user(0, gw->winptr[window]); | |
840 | } | |
841 | ||
842 | /* 4. We just pay attention to the gw->count field on setcontext */ | |
843 | tp->w_saved = 0; /* So process is allowed to execute. */ | |
844 | ||
845 | /* Setup the signal information. Solaris expects a bunch of | |
846 | * information to be passed to the signal handler, we don't provide | |
847 | * that much currently, should use siginfo. | |
848 | */ | |
849 | err |= __put_user(signr, &si->siginfo.signo); | |
850 | err |= __put_user(SVR4_SINOINFO, &si->siginfo.code); | |
851 | if (err) | |
852 | goto sigsegv; | |
853 | ||
854 | regs->u_regs[UREG_FP] = (unsigned long) sfp; | |
855 | regs->pc = (unsigned long) sa->sa_handler; | |
856 | regs->npc = (regs->pc + 4); | |
857 | ||
858 | /* Arguments passed to signal handler */ | |
859 | if (regs->u_regs[14]){ | |
860 | struct reg_window __user *rw = (struct reg_window __user *) | |
861 | regs->u_regs[14]; | |
862 | ||
863 | err |= __put_user(signr, &rw->ins[0]); | |
864 | err |= __put_user(si, &rw->ins[1]); | |
865 | err |= __put_user(uc, &rw->ins[2]); | |
866 | err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */ | |
867 | if (err) | |
868 | goto sigsegv; | |
869 | ||
870 | regs->u_regs[UREG_I0] = signr; | |
871 | regs->u_regs[UREG_I1] = (unsigned long) si; | |
872 | regs->u_regs[UREG_I2] = (unsigned long) uc; | |
873 | } | |
874 | return; | |
875 | ||
876 | sigill_and_return: | |
877 | do_exit(SIGILL); | |
878 | sigsegv: | |
879 | force_sigsegv(signr, current); | |
880 | } | |
881 | ||
882 | asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs) | |
883 | { | |
884 | svr4_gregset_t __user *gr; | |
885 | svr4_mcontext_t __user *mc; | |
886 | svr4_sigset_t setv; | |
887 | int err = 0; | |
888 | ||
889 | synchronize_user_stack(); | |
890 | ||
891 | if (current_thread_info()->w_saved) | |
892 | return -EFAULT; | |
893 | ||
894 | err = clear_user(uc, sizeof(*uc)); | |
895 | if (err) | |
896 | return -EFAULT; | |
897 | ||
898 | /* Setup convenience variables */ | |
899 | mc = &uc->mcontext; | |
900 | gr = &mc->greg; | |
901 | ||
902 | setv.sigbits[0] = current->blocked.sig[0]; | |
903 | setv.sigbits[1] = current->blocked.sig[1]; | |
904 | if (_NSIG_WORDS >= 4) { | |
905 | setv.sigbits[2] = current->blocked.sig[2]; | |
906 | setv.sigbits[3] = current->blocked.sig[3]; | |
907 | err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); | |
908 | } else | |
909 | err |= __copy_to_user(&uc->sigmask, &setv, | |
910 | 2 * sizeof(unsigned int)); | |
911 | ||
912 | /* Store registers */ | |
913 | err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]); | |
914 | err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]); | |
915 | err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]); | |
916 | err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]); | |
917 | ||
918 | /* Copy g[1..7] and o[0..7] registers */ | |
919 | err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], | |
920 | sizeof(uint) * 7); | |
921 | err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], | |
922 | sizeof(uint) * 8); | |
923 | ||
924 | /* Setup sigaltstack */ | |
925 | err |= __put_user(current->sas_ss_sp, &uc->stack.sp); | |
926 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); | |
927 | err |= __put_user(current->sas_ss_size, &uc->stack.size); | |
928 | ||
929 | /* The register file is not saved | |
930 | * we have already stuffed all of it with sync_user_stack | |
931 | */ | |
932 | return (err ? -EFAULT : 0); | |
933 | } | |
934 | ||
935 | /* Set the context for a svr4 application, this is Solaris way to sigreturn */ | |
936 | asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs) | |
937 | { | |
938 | svr4_gregset_t __user *gr; | |
939 | unsigned long pc, npc, psr; | |
940 | mm_segment_t old_fs; | |
941 | sigset_t set; | |
942 | svr4_sigset_t setv; | |
943 | int err; | |
944 | stack_t st; | |
945 | ||
946 | /* Fixme: restore windows, or is this already taken care of in | |
947 | * svr4_setup_frame when sync_user_windows is done? | |
948 | */ | |
949 | flush_user_windows(); | |
950 | ||
951 | if (current_thread_info()->w_saved) | |
952 | goto sigsegv_and_return; | |
953 | ||
954 | if (((unsigned long) c) & 3) | |
955 | goto sigsegv_and_return; | |
956 | ||
957 | if (!__access_ok((unsigned long)c, sizeof(*c))) | |
958 | goto sigsegv_and_return; | |
959 | ||
960 | /* Check for valid PC and nPC */ | |
961 | gr = &c->mcontext.greg; | |
962 | err = __get_user(pc, &((*gr)[SVR4_PC])); | |
963 | err |= __get_user(npc, &((*gr)[SVR4_NPC])); | |
964 | ||
965 | if ((pc | npc) & 3) | |
966 | goto sigsegv_and_return; | |
967 | ||
968 | /* Retrieve information from passed ucontext */ | |
969 | /* note that nPC is ored a 1, this is used to inform entry.S */ | |
970 | /* that we don't want it to mess with our PC and nPC */ | |
971 | ||
972 | /* This is pretty much atomic, no amount locking would prevent | |
973 | * the races which exist anyways. | |
974 | */ | |
975 | err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); | |
976 | ||
977 | err |= __get_user(st.ss_sp, &c->stack.sp); | |
978 | err |= __get_user(st.ss_flags, &c->stack.flags); | |
979 | err |= __get_user(st.ss_size, &c->stack.size); | |
980 | ||
981 | if (err) | |
982 | goto sigsegv_and_return; | |
983 | ||
984 | /* It is more difficult to avoid calling this function than to | |
985 | call it and ignore errors. */ | |
986 | old_fs = get_fs(); | |
987 | set_fs(KERNEL_DS); | |
988 | do_sigaltstack((const stack_t __user *) &st, NULL, | |
989 | regs->u_regs[UREG_I6]); | |
990 | set_fs(old_fs); | |
991 | ||
992 | set.sig[0] = setv.sigbits[0]; | |
993 | set.sig[1] = setv.sigbits[1]; | |
994 | if (_NSIG_WORDS >= 4) { | |
995 | set.sig[2] = setv.sigbits[2]; | |
996 | set.sig[3] = setv.sigbits[3]; | |
997 | } | |
998 | sigdelsetmask(&set, ~_BLOCKABLE); | |
999 | spin_lock_irq(¤t->sighand->siglock); | |
1000 | current->blocked = set; | |
1001 | recalc_sigpending(); | |
1002 | spin_unlock_irq(¤t->sighand->siglock); | |
1003 | regs->pc = pc; | |
1004 | regs->npc = npc | 1; | |
1005 | err |= __get_user(regs->y, &((*gr)[SVR4_Y])); | |
1006 | err |= __get_user(psr, &((*gr)[SVR4_PSR])); | |
1007 | regs->psr &= ~(PSR_ICC); | |
1008 | regs->psr |= (psr & PSR_ICC); | |
1009 | ||
1010 | /* Restore g[1..7] and o[0..7] registers */ | |
1011 | err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1], | |
1012 | sizeof(long) * 7); | |
1013 | err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0], | |
1014 | sizeof(long) * 8); | |
1015 | return (err ? -EFAULT : 0); | |
1016 | ||
1017 | sigsegv_and_return: | |
1018 | force_sig(SIGSEGV, current); | |
1019 | return -EFAULT; | |
1020 | } | |
1021 | ||
1022 | static inline void | |
1023 | handle_signal(unsigned long signr, struct k_sigaction *ka, | |
1024 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
1025 | int svr4_signal) | |
1026 | { | |
1027 | if (svr4_signal) | |
1028 | setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); | |
1029 | else { | |
1030 | if (ka->sa.sa_flags & SA_SIGINFO) | |
1031 | new_setup_rt_frame(ka, regs, signr, oldset, info); | |
1032 | else if (current->thread.new_signal) | |
1033 | new_setup_frame(ka, regs, signr, oldset); | |
1034 | else | |
1035 | setup_frame(&ka->sa, regs, signr, oldset, info); | |
1036 | } | |
69be8f18 SR |
1037 | spin_lock_irq(¤t->sighand->siglock); |
1038 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
1039 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 1040 | sigaddset(¤t->blocked, signr); |
69be8f18 SR |
1041 | recalc_sigpending(); |
1042 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
1046 | struct sigaction *sa) | |
1047 | { | |
1048 | switch(regs->u_regs[UREG_I0]) { | |
1049 | case ERESTART_RESTARTBLOCK: | |
1050 | case ERESTARTNOHAND: | |
1051 | no_system_call_restart: | |
1052 | regs->u_regs[UREG_I0] = EINTR; | |
1053 | regs->psr |= PSR_C; | |
1054 | break; | |
1055 | case ERESTARTSYS: | |
1056 | if (!(sa->sa_flags & SA_RESTART)) | |
1057 | goto no_system_call_restart; | |
1058 | /* fallthrough */ | |
1059 | case ERESTARTNOINTR: | |
1060 | regs->u_regs[UREG_I0] = orig_i0; | |
1061 | regs->pc -= 4; | |
1062 | regs->npc -= 4; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
1067 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1068 | * mistake. | |
1069 | */ | |
1070 | asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs, | |
1071 | unsigned long orig_i0, int restart_syscall) | |
1072 | { | |
1073 | siginfo_t info; | |
1074 | struct sparc_deliver_cookie cookie; | |
1075 | struct k_sigaction ka; | |
1076 | int signr; | |
1077 | ||
1078 | /* | |
1079 | * XXX Disable svr4 signal handling until solaris emulation works. | |
1080 | * It is buggy - Anton | |
1081 | */ | |
1082 | #define SVR4_SIGNAL_BROKEN 1 | |
1083 | #ifdef SVR4_SIGNAL_BROKEN | |
1084 | int svr4_signal = 0; | |
1085 | #else | |
1086 | int svr4_signal = current->personality == PER_SVR4; | |
1087 | #endif | |
1088 | ||
1089 | cookie.restart_syscall = restart_syscall; | |
1090 | cookie.orig_i0 = orig_i0; | |
1091 | ||
1092 | if (!oldset) | |
1093 | oldset = ¤t->blocked; | |
1094 | ||
1095 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
1096 | if (signr > 0) { | |
1097 | if (cookie.restart_syscall) | |
1098 | syscall_restart(cookie.orig_i0, regs, &ka.sa); | |
1099 | handle_signal(signr, &ka, &info, oldset, | |
1100 | regs, svr4_signal); | |
1101 | return 1; | |
1102 | } | |
1103 | if (cookie.restart_syscall && | |
1104 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
1105 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
1106 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
1107 | /* replay the system call when we are done */ | |
1108 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
1109 | regs->pc -= 4; | |
1110 | regs->npc -= 4; | |
1111 | } | |
1112 | if (cookie.restart_syscall && | |
1113 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
1114 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
1115 | regs->pc -= 4; | |
1116 | regs->npc -= 4; | |
1117 | } | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | asmlinkage int | |
1122 | do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr, | |
1123 | unsigned long sp) | |
1124 | { | |
1125 | int ret = -EFAULT; | |
1126 | ||
1127 | /* First see if old state is wanted. */ | |
1128 | if (ossptr) { | |
1129 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
1130 | &ossptr->the_stack) || | |
1131 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | /* Now see if we want to update the new state. */ | |
1136 | if (ssptr) { | |
1137 | char *ss_sp; | |
1138 | ||
1139 | if (get_user(ss_sp, &ssptr->the_stack)) | |
1140 | goto out; | |
1141 | /* If the current stack was set with sigaltstack, don't | |
1142 | swap stacks while we are on it. */ | |
1143 | ret = -EPERM; | |
1144 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
1145 | goto out; | |
1146 | ||
1147 | /* Since we don't know the extent of the stack, and we don't | |
1148 | track onstack-ness, but rather calculate it, we must | |
1149 | presume a size. Ho hum this interface is lossy. */ | |
1150 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
1151 | current->sas_ss_size = SIGSTKSZ; | |
1152 | } | |
1153 | ret = 0; | |
1154 | out: | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
1159 | { | |
1160 | struct sparc_deliver_cookie *cp = cookie; | |
1161 | ||
1162 | if (cp->restart_syscall && | |
1163 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
1164 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
1165 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
1166 | /* replay the system call when we are done */ | |
1167 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
1168 | regs->pc -= 4; | |
1169 | regs->npc -= 4; | |
1170 | cp->restart_syscall = 0; | |
1171 | } | |
1172 | ||
1173 | if (cp->restart_syscall && | |
1174 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
1175 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
1176 | regs->pc -= 4; | |
1177 | regs->npc -= 4; | |
1178 | cp->restart_syscall = 0; | |
1179 | } | |
1180 | } |