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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 | ||
1da177e4 LT |
10 | #include <linux/sched.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/signal.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/ptrace.h> | |
16 | #include <linux/unistd.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/tty.h> | |
19 | #include <linux/smp.h> | |
1da177e4 LT |
20 | #include <linux/binfmts.h> /* do_coredum */ |
21 | #include <linux/bitops.h> | |
22 | ||
23 | #include <asm/uaccess.h> | |
24 | #include <asm/ptrace.h> | |
25 | #include <asm/svr4.h> | |
26 | #include <asm/pgalloc.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/cacheflush.h> /* flush_sig_insns */ | |
29 | ||
30 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
31 | ||
32 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, | |
33 | void *fpqueue, unsigned long *fpqdepth); | |
34 | extern void fpload(unsigned long *fpregs, unsigned long *fsr); | |
35 | ||
1da177e4 LT |
36 | /* Signal frames: the original one (compatible with SunOS): |
37 | * | |
38 | * Set up a signal frame... Make the stack look the way SunOS | |
39 | * expects it to look which is basically: | |
40 | * | |
41 | * ---------------------------------- <-- %sp at signal time | |
42 | * Struct sigcontext | |
43 | * Signal address | |
44 | * Ptr to sigcontext area above | |
45 | * Signal code | |
46 | * The signal number itself | |
47 | * One register window | |
48 | * ---------------------------------- <-- New %sp | |
49 | */ | |
50 | struct signal_sframe { | |
51 | struct reg_window sig_window; | |
52 | int sig_num; | |
53 | int sig_code; | |
54 | struct sigcontext __user *sig_scptr; | |
55 | int sig_address; | |
56 | struct sigcontext sig_context; | |
57 | unsigned int extramask[_NSIG_WORDS - 1]; | |
58 | }; | |
59 | ||
60 | /* | |
61 | * And the new one, intended to be used for Linux applications only | |
62 | * (we have enough in there to work with clone). | |
63 | * All the interesting bits are in the info field. | |
64 | */ | |
65 | ||
66 | struct new_signal_frame { | |
67 | struct sparc_stackf ss; | |
68 | __siginfo_t info; | |
69 | __siginfo_fpu_t __user *fpu_save; | |
70 | unsigned long insns[2] __attribute__ ((aligned (8))); | |
71 | unsigned int extramask[_NSIG_WORDS - 1]; | |
72 | unsigned int extra_size; /* Should be 0 */ | |
73 | __siginfo_fpu_t fpu_state; | |
74 | }; | |
75 | ||
76 | struct rt_signal_frame { | |
77 | struct sparc_stackf ss; | |
78 | siginfo_t info; | |
79 | struct pt_regs regs; | |
80 | sigset_t mask; | |
81 | __siginfo_fpu_t __user *fpu_save; | |
82 | unsigned int insns[2]; | |
83 | stack_t stack; | |
84 | unsigned int extra_size; /* Should be 0 */ | |
85 | __siginfo_fpu_t fpu_state; | |
86 | }; | |
87 | ||
88 | /* Align macros */ | |
89 | #define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7))) | |
90 | #define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7))) | |
91 | #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7))) | |
92 | ||
2d7d5f05 | 93 | static int _sigpause_common(old_sigset_t set) |
1da177e4 | 94 | { |
1da177e4 LT |
95 | set &= _BLOCKABLE; |
96 | spin_lock_irq(¤t->sighand->siglock); | |
2d7d5f05 | 97 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
98 | siginitset(¤t->blocked, set); |
99 | recalc_sigpending(); | |
100 | spin_unlock_irq(¤t->sighand->siglock); | |
101 | ||
2d7d5f05 DM |
102 | current->state = TASK_INTERRUPTIBLE; |
103 | schedule(); | |
104 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 | 105 | |
2d7d5f05 | 106 | return -ERESTARTNOHAND; |
1da177e4 LT |
107 | } |
108 | ||
2d7d5f05 | 109 | asmlinkage int sys_sigpause(unsigned int set) |
1da177e4 | 110 | { |
2d7d5f05 | 111 | return _sigpause_common(set); |
1da177e4 LT |
112 | } |
113 | ||
2d7d5f05 | 114 | asmlinkage int sys_sigsuspend(old_sigset_t set) |
1da177e4 | 115 | { |
2d7d5f05 | 116 | return _sigpause_common(set); |
1da177e4 LT |
117 | } |
118 | ||
119 | static inline int | |
120 | restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
121 | { | |
122 | int err; | |
123 | #ifdef CONFIG_SMP | |
124 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) | |
125 | regs->psr &= ~PSR_EF; | |
126 | #else | |
127 | if (current == last_task_used_math) { | |
128 | last_task_used_math = NULL; | |
129 | regs->psr &= ~PSR_EF; | |
130 | } | |
131 | #endif | |
132 | set_used_math(); | |
133 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
134 | ||
135 | if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu))) | |
136 | return -EFAULT; | |
137 | ||
138 | err = __copy_from_user(¤t->thread.float_regs[0], &fpu->si_float_regs[0], | |
139 | (sizeof(unsigned long) * 32)); | |
140 | err |= __get_user(current->thread.fsr, &fpu->si_fsr); | |
141 | err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
142 | if (current->thread.fpqdepth != 0) | |
143 | err |= __copy_from_user(¤t->thread.fpqueue[0], | |
144 | &fpu->si_fpqueue[0], | |
145 | ((sizeof(unsigned long) + | |
146 | (sizeof(unsigned long *)))*16)); | |
147 | return err; | |
148 | } | |
149 | ||
150 | static inline void do_new_sigreturn (struct pt_regs *regs) | |
151 | { | |
152 | struct new_signal_frame __user *sf; | |
153 | unsigned long up_psr, pc, npc; | |
154 | sigset_t set; | |
155 | __siginfo_fpu_t __user *fpu_save; | |
156 | int err; | |
157 | ||
158 | sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP]; | |
159 | ||
160 | /* 1. Make sure we are not getting garbage from the user */ | |
161 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf))) | |
162 | goto segv_and_exit; | |
163 | ||
164 | if (((unsigned long) sf) & 3) | |
165 | goto segv_and_exit; | |
166 | ||
167 | err = __get_user(pc, &sf->info.si_regs.pc); | |
168 | err |= __get_user(npc, &sf->info.si_regs.npc); | |
169 | ||
170 | if ((pc | npc) & 3) | |
171 | goto segv_and_exit; | |
172 | ||
173 | /* 2. Restore the state */ | |
174 | up_psr = regs->psr; | |
175 | err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs)); | |
176 | ||
177 | /* User can only change condition codes and FPU enabling in %psr. */ | |
178 | regs->psr = (up_psr & ~(PSR_ICC | PSR_EF)) | |
179 | | (regs->psr & (PSR_ICC | PSR_EF)); | |
180 | ||
181 | err |= __get_user(fpu_save, &sf->fpu_save); | |
182 | ||
183 | if (fpu_save) | |
184 | err |= restore_fpu_state(regs, fpu_save); | |
185 | ||
186 | /* This is pretty much atomic, no amount locking would prevent | |
187 | * the races which exist anyways. | |
188 | */ | |
189 | err |= __get_user(set.sig[0], &sf->info.si_mask); | |
190 | err |= __copy_from_user(&set.sig[1], &sf->extramask, | |
191 | (_NSIG_WORDS-1) * sizeof(unsigned int)); | |
192 | ||
193 | if (err) | |
194 | goto segv_and_exit; | |
195 | ||
196 | sigdelsetmask(&set, ~_BLOCKABLE); | |
197 | spin_lock_irq(¤t->sighand->siglock); | |
198 | current->blocked = set; | |
199 | recalc_sigpending(); | |
200 | spin_unlock_irq(¤t->sighand->siglock); | |
201 | return; | |
202 | ||
203 | segv_and_exit: | |
204 | force_sig(SIGSEGV, current); | |
205 | } | |
206 | ||
207 | asmlinkage void do_sigreturn(struct pt_regs *regs) | |
208 | { | |
209 | struct sigcontext __user *scptr; | |
210 | unsigned long pc, npc, psr; | |
211 | sigset_t set; | |
212 | int err; | |
213 | ||
214 | /* Always make any pending restarted system calls return -EINTR */ | |
215 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
216 | ||
217 | synchronize_user_stack(); | |
218 | ||
219 | if (current->thread.new_signal) { | |
220 | do_new_sigreturn(regs); | |
221 | return; | |
222 | } | |
223 | ||
224 | scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0]; | |
225 | ||
226 | /* Check sanity of the user arg. */ | |
227 | if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) || | |
228 | (((unsigned long) scptr) & 3)) | |
229 | goto segv_and_exit; | |
230 | ||
231 | err = __get_user(pc, &scptr->sigc_pc); | |
232 | err |= __get_user(npc, &scptr->sigc_npc); | |
233 | ||
234 | if ((pc | npc) & 3) | |
235 | goto segv_and_exit; | |
236 | ||
237 | /* This is pretty much atomic, no amount locking would prevent | |
238 | * the races which exist anyways. | |
239 | */ | |
240 | err |= __get_user(set.sig[0], &scptr->sigc_mask); | |
241 | /* Note that scptr + 1 points to extramask */ | |
242 | err |= __copy_from_user(&set.sig[1], scptr + 1, | |
243 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
244 | ||
245 | if (err) | |
246 | goto segv_and_exit; | |
247 | ||
248 | sigdelsetmask(&set, ~_BLOCKABLE); | |
249 | spin_lock_irq(¤t->sighand->siglock); | |
250 | current->blocked = set; | |
251 | recalc_sigpending(); | |
252 | spin_unlock_irq(¤t->sighand->siglock); | |
253 | ||
254 | regs->pc = pc; | |
255 | regs->npc = npc; | |
256 | ||
257 | err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp); | |
258 | err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0); | |
259 | err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1); | |
260 | ||
261 | /* User can only change condition codes in %psr. */ | |
262 | err |= __get_user(psr, &scptr->sigc_psr); | |
263 | if (err) | |
264 | goto segv_and_exit; | |
265 | ||
266 | regs->psr &= ~(PSR_ICC); | |
267 | regs->psr |= (psr & PSR_ICC); | |
268 | return; | |
269 | ||
270 | segv_and_exit: | |
271 | force_sig(SIGSEGV, current); | |
272 | } | |
273 | ||
274 | asmlinkage void do_rt_sigreturn(struct pt_regs *regs) | |
275 | { | |
276 | struct rt_signal_frame __user *sf; | |
277 | unsigned int psr, pc, npc; | |
278 | __siginfo_fpu_t __user *fpu_save; | |
279 | mm_segment_t old_fs; | |
280 | sigset_t set; | |
281 | stack_t st; | |
282 | int err; | |
283 | ||
284 | synchronize_user_stack(); | |
285 | sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP]; | |
286 | if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || | |
287 | (((unsigned long) sf) & 0x03)) | |
288 | goto segv; | |
289 | ||
290 | err = __get_user(pc, &sf->regs.pc); | |
291 | err |= __get_user(npc, &sf->regs.npc); | |
292 | err |= ((pc | npc) & 0x03); | |
293 | ||
294 | err |= __get_user(regs->y, &sf->regs.y); | |
295 | err |= __get_user(psr, &sf->regs.psr); | |
296 | ||
297 | err |= __copy_from_user(®s->u_regs[UREG_G1], | |
298 | &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32)); | |
299 | ||
300 | regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC); | |
301 | ||
302 | err |= __get_user(fpu_save, &sf->fpu_save); | |
303 | ||
304 | if (fpu_save) | |
305 | err |= restore_fpu_state(regs, fpu_save); | |
306 | err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); | |
307 | ||
308 | err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t)); | |
309 | ||
310 | if (err) | |
311 | goto segv; | |
312 | ||
313 | regs->pc = pc; | |
314 | regs->npc = npc; | |
315 | ||
316 | /* It is more difficult to avoid calling this function than to | |
317 | * call it and ignore errors. | |
318 | */ | |
319 | old_fs = get_fs(); | |
320 | set_fs(KERNEL_DS); | |
321 | do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf); | |
322 | set_fs(old_fs); | |
323 | ||
324 | sigdelsetmask(&set, ~_BLOCKABLE); | |
325 | spin_lock_irq(¤t->sighand->siglock); | |
326 | current->blocked = set; | |
327 | recalc_sigpending(); | |
328 | spin_unlock_irq(¤t->sighand->siglock); | |
329 | return; | |
330 | segv: | |
331 | force_sig(SIGSEGV, current); | |
332 | } | |
333 | ||
334 | /* Checks if the fp is valid */ | |
335 | static inline int invalid_frame_pointer(void __user *fp, int fplen) | |
336 | { | |
337 | if ((((unsigned long) fp) & 7) || | |
338 | !__access_ok((unsigned long)fp, fplen) || | |
339 | ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) && | |
340 | ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000))) | |
341 | return 1; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) | |
347 | { | |
348 | unsigned long sp; | |
349 | ||
350 | sp = regs->u_regs[UREG_FP]; | |
351 | ||
352 | /* This is the X/Open sanctioned signal stack switching. */ | |
353 | if (sa->sa_flags & SA_ONSTACK) { | |
354 | if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7)) | |
355 | sp = current->sas_ss_sp + current->sas_ss_size; | |
356 | } | |
357 | return (void __user *)(sp - framesize); | |
358 | } | |
359 | ||
360 | static inline void | |
361 | setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info) | |
362 | { | |
363 | struct signal_sframe __user *sframep; | |
364 | struct sigcontext __user *sc; | |
365 | int window = 0, err; | |
366 | unsigned long pc = regs->pc; | |
367 | unsigned long npc = regs->npc; | |
368 | struct thread_info *tp = current_thread_info(); | |
369 | void __user *sig_address; | |
370 | int sig_code; | |
371 | ||
372 | synchronize_user_stack(); | |
373 | sframep = (struct signal_sframe __user *) | |
374 | get_sigframe(sa, regs, SF_ALIGNEDSZ); | |
375 | if (invalid_frame_pointer(sframep, sizeof(*sframep))){ | |
376 | /* Don't change signal code and address, so that | |
377 | * post mortem debuggers can have a look. | |
378 | */ | |
379 | goto sigill_and_return; | |
380 | } | |
381 | ||
382 | sc = &sframep->sig_context; | |
383 | ||
384 | /* We've already made sure frame pointer isn't in kernel space... */ | |
385 | err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK), | |
386 | &sc->sigc_onstack); | |
387 | err |= __put_user(oldset->sig[0], &sc->sigc_mask); | |
388 | err |= __copy_to_user(sframep->extramask, &oldset->sig[1], | |
389 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
390 | err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp); | |
391 | err |= __put_user(pc, &sc->sigc_pc); | |
392 | err |= __put_user(npc, &sc->sigc_npc); | |
393 | err |= __put_user(regs->psr, &sc->sigc_psr); | |
394 | err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1); | |
395 | err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0); | |
396 | err |= __put_user(tp->w_saved, &sc->sigc_oswins); | |
397 | if (tp->w_saved) | |
398 | for (window = 0; window < tp->w_saved; window++) { | |
399 | put_user((char *)tp->rwbuf_stkptrs[window], | |
400 | &sc->sigc_spbuf[window]); | |
401 | err |= __copy_to_user(&sc->sigc_wbuf[window], | |
402 | &tp->reg_window[window], | |
403 | sizeof(struct reg_window)); | |
404 | } | |
405 | else | |
406 | err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP], | |
407 | sizeof(struct reg_window)); | |
408 | ||
409 | tp->w_saved = 0; /* So process is allowed to execute. */ | |
410 | ||
411 | err |= __put_user(signr, &sframep->sig_num); | |
412 | sig_address = NULL; | |
413 | sig_code = 0; | |
414 | if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) { | |
415 | sig_address = info->si_addr; | |
416 | switch (signr) { | |
417 | case SIGSEGV: | |
418 | switch (info->si_code) { | |
419 | case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break; | |
420 | default: sig_code = SUBSIG_PROTECTION; break; | |
421 | } | |
422 | break; | |
423 | case SIGILL: | |
424 | switch (info->si_code) { | |
425 | case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break; | |
426 | case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break; | |
427 | case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break; | |
428 | default: sig_code = SUBSIG_STACK; break; | |
429 | } | |
430 | break; | |
431 | case SIGFPE: | |
432 | switch (info->si_code) { | |
433 | case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break; | |
434 | case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break; | |
435 | case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break; | |
436 | case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break; | |
437 | case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break; | |
438 | case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break; | |
439 | case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break; | |
440 | default: sig_code = SUBSIG_FPERROR; break; | |
441 | } | |
442 | break; | |
443 | case SIGBUS: | |
444 | switch (info->si_code) { | |
445 | case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break; | |
446 | case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break; | |
447 | default: sig_code = SUBSIG_BUSTIMEOUT; break; | |
448 | } | |
449 | break; | |
450 | case SIGEMT: | |
451 | switch (info->si_code) { | |
452 | case EMT_TAGOVF: sig_code = SUBSIG_TAG; break; | |
453 | } | |
454 | break; | |
455 | case SIGSYS: | |
456 | if (info->si_code == (__SI_FAULT|0x100)) { | |
457 | /* See sys_sunos.c */ | |
458 | sig_code = info->si_trapno; | |
459 | break; | |
460 | } | |
461 | default: | |
462 | sig_address = NULL; | |
463 | } | |
464 | } | |
465 | err |= __put_user((unsigned long)sig_address, &sframep->sig_address); | |
466 | err |= __put_user(sig_code, &sframep->sig_code); | |
467 | err |= __put_user(sc, &sframep->sig_scptr); | |
468 | if (err) | |
469 | goto sigsegv; | |
470 | ||
471 | regs->u_regs[UREG_FP] = (unsigned long) sframep; | |
472 | regs->pc = (unsigned long) sa->sa_handler; | |
473 | regs->npc = (regs->pc + 4); | |
474 | return; | |
475 | ||
476 | sigill_and_return: | |
477 | do_exit(SIGILL); | |
478 | sigsegv: | |
479 | force_sigsegv(signr, current); | |
480 | } | |
481 | ||
482 | ||
483 | static inline int | |
484 | save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu) | |
485 | { | |
486 | int err = 0; | |
487 | #ifdef CONFIG_SMP | |
488 | if (test_tsk_thread_flag(current, TIF_USEDFPU)) { | |
489 | put_psr(get_psr() | PSR_EF); | |
490 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
491 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
492 | regs->psr &= ~(PSR_EF); | |
493 | clear_tsk_thread_flag(current, TIF_USEDFPU); | |
494 | } | |
495 | #else | |
496 | if (current == last_task_used_math) { | |
497 | put_psr(get_psr() | PSR_EF); | |
498 | fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr, | |
499 | ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth); | |
500 | last_task_used_math = NULL; | |
501 | regs->psr &= ~(PSR_EF); | |
502 | } | |
503 | #endif | |
504 | err |= __copy_to_user(&fpu->si_float_regs[0], | |
505 | ¤t->thread.float_regs[0], | |
506 | (sizeof(unsigned long) * 32)); | |
507 | err |= __put_user(current->thread.fsr, &fpu->si_fsr); | |
508 | err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth); | |
509 | if (current->thread.fpqdepth != 0) | |
510 | err |= __copy_to_user(&fpu->si_fpqueue[0], | |
511 | ¤t->thread.fpqueue[0], | |
512 | ((sizeof(unsigned long) + | |
513 | (sizeof(unsigned long *)))*16)); | |
514 | clear_used_math(); | |
515 | return err; | |
516 | } | |
517 | ||
518 | static inline void | |
519 | new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
520 | int signo, sigset_t *oldset) | |
521 | { | |
522 | struct new_signal_frame __user *sf; | |
523 | int sigframe_size, err; | |
524 | ||
525 | /* 1. Make sure everything is clean */ | |
526 | synchronize_user_stack(); | |
527 | ||
528 | sigframe_size = NF_ALIGNEDSZ; | |
529 | if (!used_math()) | |
530 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
531 | ||
532 | sf = (struct new_signal_frame __user *) | |
533 | get_sigframe(&ka->sa, regs, sigframe_size); | |
534 | ||
535 | if (invalid_frame_pointer(sf, sigframe_size)) | |
536 | goto sigill_and_return; | |
537 | ||
538 | if (current_thread_info()->w_saved != 0) | |
539 | goto sigill_and_return; | |
540 | ||
541 | /* 2. Save the current process state */ | |
542 | err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs)); | |
543 | ||
544 | err |= __put_user(0, &sf->extra_size); | |
545 | ||
546 | if (used_math()) { | |
547 | err |= save_fpu_state(regs, &sf->fpu_state); | |
548 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); | |
549 | } else { | |
550 | err |= __put_user(0, &sf->fpu_save); | |
551 | } | |
552 | ||
553 | err |= __put_user(oldset->sig[0], &sf->info.si_mask); | |
554 | err |= __copy_to_user(sf->extramask, &oldset->sig[1], | |
555 | (_NSIG_WORDS - 1) * sizeof(unsigned int)); | |
556 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
557 | sizeof(struct reg_window)); | |
558 | if (err) | |
559 | goto sigsegv; | |
560 | ||
561 | /* 3. signal handler back-trampoline and parameters */ | |
562 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
563 | regs->u_regs[UREG_I0] = signo; | |
564 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
565 | regs->u_regs[UREG_I2] = (unsigned long) &sf->info; | |
566 | ||
567 | /* 4. signal handler */ | |
568 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
569 | regs->npc = (regs->pc + 4); | |
570 | ||
571 | /* 5. return to kernel instructions */ | |
572 | if (ka->ka_restorer) | |
573 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
574 | else { | |
575 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
576 | ||
577 | /* mov __NR_sigreturn, %g1 */ | |
578 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
579 | ||
580 | /* t 0x10 */ | |
581 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
582 | if (err) | |
583 | goto sigsegv; | |
584 | ||
585 | /* Flush instruction space. */ | |
586 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
587 | } | |
588 | return; | |
589 | ||
590 | sigill_and_return: | |
591 | do_exit(SIGILL); | |
592 | sigsegv: | |
593 | force_sigsegv(signo, current); | |
594 | } | |
595 | ||
596 | static inline void | |
597 | new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs, | |
598 | int signo, sigset_t *oldset, siginfo_t *info) | |
599 | { | |
600 | struct rt_signal_frame __user *sf; | |
601 | int sigframe_size; | |
602 | unsigned int psr; | |
603 | int err; | |
604 | ||
605 | synchronize_user_stack(); | |
606 | sigframe_size = RT_ALIGNEDSZ; | |
607 | if (!used_math()) | |
608 | sigframe_size -= sizeof(__siginfo_fpu_t); | |
609 | sf = (struct rt_signal_frame __user *) | |
610 | get_sigframe(&ka->sa, regs, sigframe_size); | |
611 | if (invalid_frame_pointer(sf, sigframe_size)) | |
612 | goto sigill; | |
613 | if (current_thread_info()->w_saved != 0) | |
614 | goto sigill; | |
615 | ||
616 | err = __put_user(regs->pc, &sf->regs.pc); | |
617 | err |= __put_user(regs->npc, &sf->regs.npc); | |
618 | err |= __put_user(regs->y, &sf->regs.y); | |
619 | psr = regs->psr; | |
620 | if (used_math()) | |
621 | psr |= PSR_EF; | |
622 | err |= __put_user(psr, &sf->regs.psr); | |
623 | err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs)); | |
624 | err |= __put_user(0, &sf->extra_size); | |
625 | ||
626 | if (psr & PSR_EF) { | |
627 | err |= save_fpu_state(regs, &sf->fpu_state); | |
628 | err |= __put_user(&sf->fpu_state, &sf->fpu_save); | |
629 | } else { | |
630 | err |= __put_user(0, &sf->fpu_save); | |
631 | } | |
632 | err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t)); | |
633 | ||
634 | /* Setup sigaltstack */ | |
635 | err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); | |
636 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); | |
637 | err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); | |
638 | ||
639 | err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP], | |
640 | sizeof(struct reg_window)); | |
641 | ||
642 | err |= copy_siginfo_to_user(&sf->info, info); | |
643 | ||
644 | if (err) | |
645 | goto sigsegv; | |
646 | ||
647 | regs->u_regs[UREG_FP] = (unsigned long) sf; | |
648 | regs->u_regs[UREG_I0] = signo; | |
649 | regs->u_regs[UREG_I1] = (unsigned long) &sf->info; | |
650 | regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; | |
651 | ||
652 | regs->pc = (unsigned long) ka->sa.sa_handler; | |
653 | regs->npc = (regs->pc + 4); | |
654 | ||
655 | if (ka->ka_restorer) | |
656 | regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; | |
657 | else { | |
658 | regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2); | |
659 | ||
660 | /* mov __NR_sigreturn, %g1 */ | |
661 | err |= __put_user(0x821020d8, &sf->insns[0]); | |
662 | ||
663 | /* t 0x10 */ | |
664 | err |= __put_user(0x91d02010, &sf->insns[1]); | |
665 | if (err) | |
666 | goto sigsegv; | |
667 | ||
668 | /* Flush instruction space. */ | |
669 | flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); | |
670 | } | |
671 | return; | |
672 | ||
673 | sigill: | |
674 | do_exit(SIGILL); | |
675 | sigsegv: | |
676 | force_sigsegv(signo, current); | |
677 | } | |
678 | ||
679 | /* Setup a Solaris stack frame */ | |
680 | static inline void | |
681 | setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc, | |
682 | struct pt_regs *regs, int signr, sigset_t *oldset) | |
683 | { | |
684 | svr4_signal_frame_t __user *sfp; | |
685 | svr4_gregset_t __user *gr; | |
686 | svr4_siginfo_t __user *si; | |
687 | svr4_mcontext_t __user *mc; | |
688 | svr4_gwindows_t __user *gw; | |
689 | svr4_ucontext_t __user *uc; | |
690 | svr4_sigset_t setv; | |
691 | struct thread_info *tp = current_thread_info(); | |
692 | int window = 0, err; | |
693 | ||
694 | synchronize_user_stack(); | |
695 | sfp = (svr4_signal_frame_t __user *) | |
696 | get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window)); | |
697 | ||
698 | if (invalid_frame_pointer(sfp, sizeof(*sfp))) | |
699 | goto sigill_and_return; | |
700 | ||
701 | /* Start with a clean frame pointer and fill it */ | |
702 | err = __clear_user(sfp, sizeof(*sfp)); | |
703 | ||
704 | /* Setup convenience variables */ | |
705 | si = &sfp->si; | |
706 | uc = &sfp->uc; | |
707 | gw = &sfp->gw; | |
708 | mc = &uc->mcontext; | |
709 | gr = &mc->greg; | |
710 | ||
711 | /* FIXME: where am I supposed to put this? | |
712 | * sc->sigc_onstack = old_status; | |
713 | * anyways, it does not look like it is used for anything at all. | |
714 | */ | |
715 | setv.sigbits[0] = oldset->sig[0]; | |
716 | setv.sigbits[1] = oldset->sig[1]; | |
717 | if (_NSIG_WORDS >= 4) { | |
718 | setv.sigbits[2] = oldset->sig[2]; | |
719 | setv.sigbits[3] = oldset->sig[3]; | |
720 | err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); | |
721 | } else | |
722 | err |= __copy_to_user(&uc->sigmask, &setv, | |
723 | 2 * sizeof(unsigned int)); | |
724 | ||
725 | /* Store registers */ | |
726 | err |= __put_user(regs->pc, &((*gr)[SVR4_PC])); | |
727 | err |= __put_user(regs->npc, &((*gr)[SVR4_NPC])); | |
728 | err |= __put_user(regs->psr, &((*gr)[SVR4_PSR])); | |
729 | err |= __put_user(regs->y, &((*gr)[SVR4_Y])); | |
730 | ||
731 | /* Copy g[1..7] and o[0..7] registers */ | |
732 | err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], | |
733 | sizeof(long) * 7); | |
734 | err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], | |
735 | sizeof(long) * 8); | |
736 | ||
737 | /* Setup sigaltstack */ | |
738 | err |= __put_user(current->sas_ss_sp, &uc->stack.sp); | |
739 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); | |
740 | err |= __put_user(current->sas_ss_size, &uc->stack.size); | |
741 | ||
742 | /* Save the currently window file: */ | |
743 | ||
744 | /* 1. Link sfp->uc->gwins to our windows */ | |
745 | err |= __put_user(gw, &mc->gwin); | |
746 | ||
747 | /* 2. Number of windows to restore at setcontext(): */ | |
748 | err |= __put_user(tp->w_saved, &gw->count); | |
749 | ||
750 | /* 3. Save each valid window | |
751 | * Currently, it makes a copy of the windows from the kernel copy. | |
752 | * David's code for SunOS, makes the copy but keeps the pointer to | |
753 | * the kernel. My version makes the pointer point to a userland | |
754 | * copy of those. Mhm, I wonder if I shouldn't just ignore those | |
755 | * on setcontext and use those that are on the kernel, the signal | |
756 | * handler should not be modyfing those, mhm. | |
757 | * | |
758 | * These windows are just used in case synchronize_user_stack failed | |
759 | * to flush the user windows. | |
760 | */ | |
761 | for (window = 0; window < tp->w_saved; window++) { | |
762 | err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]); | |
763 | err |= __copy_to_user(&gw->win[window], | |
764 | &tp->reg_window[window], | |
765 | sizeof(svr4_rwindow_t)); | |
766 | err |= __put_user(0, gw->winptr[window]); | |
767 | } | |
768 | ||
769 | /* 4. We just pay attention to the gw->count field on setcontext */ | |
770 | tp->w_saved = 0; /* So process is allowed to execute. */ | |
771 | ||
772 | /* Setup the signal information. Solaris expects a bunch of | |
773 | * information to be passed to the signal handler, we don't provide | |
774 | * that much currently, should use siginfo. | |
775 | */ | |
776 | err |= __put_user(signr, &si->siginfo.signo); | |
777 | err |= __put_user(SVR4_SINOINFO, &si->siginfo.code); | |
778 | if (err) | |
779 | goto sigsegv; | |
780 | ||
781 | regs->u_regs[UREG_FP] = (unsigned long) sfp; | |
782 | regs->pc = (unsigned long) sa->sa_handler; | |
783 | regs->npc = (regs->pc + 4); | |
784 | ||
785 | /* Arguments passed to signal handler */ | |
786 | if (regs->u_regs[14]){ | |
787 | struct reg_window __user *rw = (struct reg_window __user *) | |
788 | regs->u_regs[14]; | |
789 | ||
790 | err |= __put_user(signr, &rw->ins[0]); | |
791 | err |= __put_user(si, &rw->ins[1]); | |
792 | err |= __put_user(uc, &rw->ins[2]); | |
793 | err |= __put_user(sfp, &rw->ins[6]); /* frame pointer */ | |
794 | if (err) | |
795 | goto sigsegv; | |
796 | ||
797 | regs->u_regs[UREG_I0] = signr; | |
798 | regs->u_regs[UREG_I1] = (unsigned long) si; | |
799 | regs->u_regs[UREG_I2] = (unsigned long) uc; | |
800 | } | |
801 | return; | |
802 | ||
803 | sigill_and_return: | |
804 | do_exit(SIGILL); | |
805 | sigsegv: | |
806 | force_sigsegv(signr, current); | |
807 | } | |
808 | ||
809 | asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs) | |
810 | { | |
811 | svr4_gregset_t __user *gr; | |
812 | svr4_mcontext_t __user *mc; | |
813 | svr4_sigset_t setv; | |
814 | int err = 0; | |
815 | ||
816 | synchronize_user_stack(); | |
817 | ||
818 | if (current_thread_info()->w_saved) | |
819 | return -EFAULT; | |
820 | ||
821 | err = clear_user(uc, sizeof(*uc)); | |
822 | if (err) | |
823 | return -EFAULT; | |
824 | ||
825 | /* Setup convenience variables */ | |
826 | mc = &uc->mcontext; | |
827 | gr = &mc->greg; | |
828 | ||
829 | setv.sigbits[0] = current->blocked.sig[0]; | |
830 | setv.sigbits[1] = current->blocked.sig[1]; | |
831 | if (_NSIG_WORDS >= 4) { | |
832 | setv.sigbits[2] = current->blocked.sig[2]; | |
833 | setv.sigbits[3] = current->blocked.sig[3]; | |
834 | err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t)); | |
835 | } else | |
836 | err |= __copy_to_user(&uc->sigmask, &setv, | |
837 | 2 * sizeof(unsigned int)); | |
838 | ||
839 | /* Store registers */ | |
840 | err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]); | |
841 | err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]); | |
842 | err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]); | |
843 | err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]); | |
844 | ||
845 | /* Copy g[1..7] and o[0..7] registers */ | |
846 | err |= __copy_to_user(&(*gr)[SVR4_G1], ®s->u_regs[UREG_G1], | |
847 | sizeof(uint) * 7); | |
848 | err |= __copy_to_user(&(*gr)[SVR4_O0], ®s->u_regs[UREG_I0], | |
849 | sizeof(uint) * 8); | |
850 | ||
851 | /* Setup sigaltstack */ | |
852 | err |= __put_user(current->sas_ss_sp, &uc->stack.sp); | |
853 | err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags); | |
854 | err |= __put_user(current->sas_ss_size, &uc->stack.size); | |
855 | ||
856 | /* The register file is not saved | |
857 | * we have already stuffed all of it with sync_user_stack | |
858 | */ | |
859 | return (err ? -EFAULT : 0); | |
860 | } | |
861 | ||
862 | /* Set the context for a svr4 application, this is Solaris way to sigreturn */ | |
863 | asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs) | |
864 | { | |
865 | svr4_gregset_t __user *gr; | |
866 | unsigned long pc, npc, psr; | |
867 | mm_segment_t old_fs; | |
868 | sigset_t set; | |
869 | svr4_sigset_t setv; | |
870 | int err; | |
871 | stack_t st; | |
872 | ||
873 | /* Fixme: restore windows, or is this already taken care of in | |
874 | * svr4_setup_frame when sync_user_windows is done? | |
875 | */ | |
876 | flush_user_windows(); | |
877 | ||
878 | if (current_thread_info()->w_saved) | |
879 | goto sigsegv_and_return; | |
880 | ||
881 | if (((unsigned long) c) & 3) | |
882 | goto sigsegv_and_return; | |
883 | ||
884 | if (!__access_ok((unsigned long)c, sizeof(*c))) | |
885 | goto sigsegv_and_return; | |
886 | ||
887 | /* Check for valid PC and nPC */ | |
888 | gr = &c->mcontext.greg; | |
889 | err = __get_user(pc, &((*gr)[SVR4_PC])); | |
890 | err |= __get_user(npc, &((*gr)[SVR4_NPC])); | |
891 | ||
892 | if ((pc | npc) & 3) | |
893 | goto sigsegv_and_return; | |
894 | ||
895 | /* Retrieve information from passed ucontext */ | |
896 | /* note that nPC is ored a 1, this is used to inform entry.S */ | |
897 | /* that we don't want it to mess with our PC and nPC */ | |
898 | ||
899 | /* This is pretty much atomic, no amount locking would prevent | |
900 | * the races which exist anyways. | |
901 | */ | |
902 | err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t)); | |
903 | ||
904 | err |= __get_user(st.ss_sp, &c->stack.sp); | |
905 | err |= __get_user(st.ss_flags, &c->stack.flags); | |
906 | err |= __get_user(st.ss_size, &c->stack.size); | |
907 | ||
908 | if (err) | |
909 | goto sigsegv_and_return; | |
910 | ||
911 | /* It is more difficult to avoid calling this function than to | |
912 | call it and ignore errors. */ | |
913 | old_fs = get_fs(); | |
914 | set_fs(KERNEL_DS); | |
915 | do_sigaltstack((const stack_t __user *) &st, NULL, | |
916 | regs->u_regs[UREG_I6]); | |
917 | set_fs(old_fs); | |
918 | ||
919 | set.sig[0] = setv.sigbits[0]; | |
920 | set.sig[1] = setv.sigbits[1]; | |
921 | if (_NSIG_WORDS >= 4) { | |
922 | set.sig[2] = setv.sigbits[2]; | |
923 | set.sig[3] = setv.sigbits[3]; | |
924 | } | |
925 | sigdelsetmask(&set, ~_BLOCKABLE); | |
926 | spin_lock_irq(¤t->sighand->siglock); | |
927 | current->blocked = set; | |
928 | recalc_sigpending(); | |
929 | spin_unlock_irq(¤t->sighand->siglock); | |
930 | regs->pc = pc; | |
931 | regs->npc = npc | 1; | |
932 | err |= __get_user(regs->y, &((*gr)[SVR4_Y])); | |
933 | err |= __get_user(psr, &((*gr)[SVR4_PSR])); | |
934 | regs->psr &= ~(PSR_ICC); | |
935 | regs->psr |= (psr & PSR_ICC); | |
936 | ||
937 | /* Restore g[1..7] and o[0..7] registers */ | |
938 | err |= __copy_from_user(®s->u_regs[UREG_G1], &(*gr)[SVR4_G1], | |
939 | sizeof(long) * 7); | |
940 | err |= __copy_from_user(®s->u_regs[UREG_I0], &(*gr)[SVR4_O0], | |
941 | sizeof(long) * 8); | |
942 | return (err ? -EFAULT : 0); | |
943 | ||
944 | sigsegv_and_return: | |
945 | force_sig(SIGSEGV, current); | |
946 | return -EFAULT; | |
947 | } | |
948 | ||
949 | static inline void | |
950 | handle_signal(unsigned long signr, struct k_sigaction *ka, | |
951 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
952 | int svr4_signal) | |
953 | { | |
954 | if (svr4_signal) | |
955 | setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset); | |
956 | else { | |
957 | if (ka->sa.sa_flags & SA_SIGINFO) | |
958 | new_setup_rt_frame(ka, regs, signr, oldset, info); | |
959 | else if (current->thread.new_signal) | |
960 | new_setup_frame(ka, regs, signr, oldset); | |
961 | else | |
962 | setup_frame(&ka->sa, regs, signr, oldset, info); | |
963 | } | |
69be8f18 SR |
964 | spin_lock_irq(¤t->sighand->siglock); |
965 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
966 | if (!(ka->sa.sa_flags & SA_NOMASK)) | |
1da177e4 | 967 | sigaddset(¤t->blocked, signr); |
69be8f18 SR |
968 | recalc_sigpending(); |
969 | spin_unlock_irq(¤t->sighand->siglock); | |
1da177e4 LT |
970 | } |
971 | ||
972 | static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, | |
973 | struct sigaction *sa) | |
974 | { | |
975 | switch(regs->u_regs[UREG_I0]) { | |
976 | case ERESTART_RESTARTBLOCK: | |
977 | case ERESTARTNOHAND: | |
978 | no_system_call_restart: | |
979 | regs->u_regs[UREG_I0] = EINTR; | |
980 | regs->psr |= PSR_C; | |
981 | break; | |
982 | case ERESTARTSYS: | |
983 | if (!(sa->sa_flags & SA_RESTART)) | |
984 | goto no_system_call_restart; | |
985 | /* fallthrough */ | |
986 | case ERESTARTNOINTR: | |
987 | regs->u_regs[UREG_I0] = orig_i0; | |
988 | regs->pc -= 4; | |
989 | regs->npc -= 4; | |
990 | } | |
991 | } | |
992 | ||
993 | /* Note that 'init' is a special process: it doesn't get signals it doesn't | |
994 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
995 | * mistake. | |
996 | */ | |
2d7d5f05 | 997 | asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall) |
1da177e4 LT |
998 | { |
999 | siginfo_t info; | |
1000 | struct sparc_deliver_cookie cookie; | |
1001 | struct k_sigaction ka; | |
1002 | int signr; | |
2d7d5f05 | 1003 | sigset_t *oldset; |
1da177e4 LT |
1004 | |
1005 | /* | |
1006 | * XXX Disable svr4 signal handling until solaris emulation works. | |
1007 | * It is buggy - Anton | |
1008 | */ | |
1009 | #define SVR4_SIGNAL_BROKEN 1 | |
1010 | #ifdef SVR4_SIGNAL_BROKEN | |
1011 | int svr4_signal = 0; | |
1012 | #else | |
1013 | int svr4_signal = current->personality == PER_SVR4; | |
1014 | #endif | |
1015 | ||
1016 | cookie.restart_syscall = restart_syscall; | |
1017 | cookie.orig_i0 = orig_i0; | |
1018 | ||
2d7d5f05 DM |
1019 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
1020 | oldset = ¤t->saved_sigmask; | |
1021 | else | |
1da177e4 LT |
1022 | oldset = ¤t->blocked; |
1023 | ||
1024 | signr = get_signal_to_deliver(&info, &ka, regs, &cookie); | |
1025 | if (signr > 0) { | |
1026 | if (cookie.restart_syscall) | |
1027 | syscall_restart(cookie.orig_i0, regs, &ka.sa); | |
1028 | handle_signal(signr, &ka, &info, oldset, | |
1029 | regs, svr4_signal); | |
2d7d5f05 DM |
1030 | /* a signal was successfully delivered; the saved |
1031 | * sigmask will have been stored in the signal frame, | |
1032 | * and will be restored by sigreturn, so we can simply | |
1033 | * clear the TIF_RESTORE_SIGMASK flag. | |
1034 | */ | |
1035 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1036 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1037 | return; | |
1da177e4 LT |
1038 | } |
1039 | if (cookie.restart_syscall && | |
1040 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
1041 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
1042 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
1043 | /* replay the system call when we are done */ | |
1044 | regs->u_regs[UREG_I0] = cookie.orig_i0; | |
1045 | regs->pc -= 4; | |
1046 | regs->npc -= 4; | |
1047 | } | |
1048 | if (cookie.restart_syscall && | |
1049 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
1050 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
1051 | regs->pc -= 4; | |
1052 | regs->npc -= 4; | |
1053 | } | |
2d7d5f05 DM |
1054 | |
1055 | /* if there's no signal to deliver, we just put the saved sigmask | |
1056 | * back | |
1057 | */ | |
1058 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1059 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1060 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1061 | } | |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | asmlinkage int | |
1065 | do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr, | |
1066 | unsigned long sp) | |
1067 | { | |
1068 | int ret = -EFAULT; | |
1069 | ||
1070 | /* First see if old state is wanted. */ | |
1071 | if (ossptr) { | |
1072 | if (put_user(current->sas_ss_sp + current->sas_ss_size, | |
1073 | &ossptr->the_stack) || | |
1074 | __put_user(on_sig_stack(sp), &ossptr->cur_status)) | |
1075 | goto out; | |
1076 | } | |
1077 | ||
1078 | /* Now see if we want to update the new state. */ | |
1079 | if (ssptr) { | |
1080 | char *ss_sp; | |
1081 | ||
1082 | if (get_user(ss_sp, &ssptr->the_stack)) | |
1083 | goto out; | |
1084 | /* If the current stack was set with sigaltstack, don't | |
1085 | swap stacks while we are on it. */ | |
1086 | ret = -EPERM; | |
1087 | if (current->sas_ss_sp && on_sig_stack(sp)) | |
1088 | goto out; | |
1089 | ||
1090 | /* Since we don't know the extent of the stack, and we don't | |
1091 | track onstack-ness, but rather calculate it, we must | |
1092 | presume a size. Ho hum this interface is lossy. */ | |
1093 | current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; | |
1094 | current->sas_ss_size = SIGSTKSZ; | |
1095 | } | |
1096 | ret = 0; | |
1097 | out: | |
1098 | return ret; | |
1099 | } | |
1100 | ||
1101 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) | |
1102 | { | |
1103 | struct sparc_deliver_cookie *cp = cookie; | |
1104 | ||
1105 | if (cp->restart_syscall && | |
1106 | (regs->u_regs[UREG_I0] == ERESTARTNOHAND || | |
1107 | regs->u_regs[UREG_I0] == ERESTARTSYS || | |
1108 | regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { | |
1109 | /* replay the system call when we are done */ | |
1110 | regs->u_regs[UREG_I0] = cp->orig_i0; | |
1111 | regs->pc -= 4; | |
1112 | regs->npc -= 4; | |
1113 | cp->restart_syscall = 0; | |
1114 | } | |
1115 | ||
1116 | if (cp->restart_syscall && | |
1117 | regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { | |
1118 | regs->u_regs[UREG_G1] = __NR_restart_syscall; | |
1119 | regs->pc -= 4; | |
1120 | regs->npc -= 4; | |
1121 | cp->restart_syscall = 0; | |
1122 | } | |
1123 | } |