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0c22fafd GU |
1 | /* |
2 | * linux/arch/m68k/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file COPYING in the main directory of this archive | |
8 | * for more details. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * Linux/m68k support by Hamish Macdonald | |
13 | * | |
14 | * 68060 fixes by Jesper Skov | |
15 | * | |
16 | * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab | |
17 | * | |
18 | * mathemu support by Roman Zippel | |
19 | * (Note: fpstate in the signal context is completely ignored for the emulator | |
20 | * and the internal floating point format is put on stack) | |
21 | */ | |
22 | ||
23 | /* | |
24 | * ++roman (07/09/96): implemented signal stacks (specially for tosemu on | |
25 | * Atari :-) Current limitation: Only one sigstack can be active at one time. | |
26 | * If a second signal with SA_ONSTACK set arrives while working on a sigstack, | |
27 | * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested | |
28 | * signal handlers! | |
29 | */ | |
30 | ||
31 | #include <linux/sched.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/signal.h> | |
35 | #include <linux/syscalls.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/ptrace.h> | |
39 | #include <linux/unistd.h> | |
40 | #include <linux/stddef.h> | |
41 | #include <linux/highuid.h> | |
42 | #include <linux/personality.h> | |
43 | #include <linux/tty.h> | |
44 | #include <linux/binfmts.h> | |
45 | #include <linux/module.h> | |
a54f1655 | 46 | #include <linux/tracehook.h> |
0c22fafd GU |
47 | |
48 | #include <asm/setup.h> | |
49 | #include <asm/uaccess.h> | |
50 | #include <asm/pgtable.h> | |
51 | #include <asm/traps.h> | |
52 | #include <asm/ucontext.h> | |
42cb38bc | 53 | #include <asm/cacheflush.h> |
0c22fafd | 54 | |
66d857b0 | 55 | #ifdef CONFIG_MMU |
0c22fafd GU |
56 | |
57 | /* | |
58 | * Handle the slight differences in classic 68k and ColdFire trap frames. | |
59 | */ | |
60 | #ifdef CONFIG_COLDFIRE | |
61 | #define FORMAT 4 | |
62 | #define FMT4SIZE 0 | |
00ebfe58 | 63 | #else |
0c22fafd GU |
64 | #define FORMAT 0 |
65 | #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4) | |
1da177e4 | 66 | #endif |
0c22fafd GU |
67 | |
68 | static const int frame_size_change[16] = { | |
69 | [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ | |
70 | [2] = sizeof(((struct frame *)0)->un.fmt2), | |
71 | [3] = sizeof(((struct frame *)0)->un.fmt3), | |
72 | [4] = FMT4SIZE, | |
73 | [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */ | |
74 | [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */ | |
75 | [7] = sizeof(((struct frame *)0)->un.fmt7), | |
76 | [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */ | |
77 | [9] = sizeof(((struct frame *)0)->un.fmt9), | |
78 | [10] = sizeof(((struct frame *)0)->un.fmta), | |
79 | [11] = sizeof(((struct frame *)0)->un.fmtb), | |
80 | [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */ | |
81 | [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */ | |
82 | [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */ | |
83 | [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ | |
84 | }; | |
85 | ||
86 | static inline int frame_extra_sizes(int f) | |
87 | { | |
88 | return frame_size_change[f]; | |
89 | } | |
90 | ||
91 | int handle_kernel_fault(struct pt_regs *regs) | |
92 | { | |
93 | const struct exception_table_entry *fixup; | |
94 | struct pt_regs *tregs; | |
95 | ||
96 | /* Are we prepared to handle this kernel fault? */ | |
97 | fixup = search_exception_tables(regs->pc); | |
98 | if (!fixup) | |
99 | return 0; | |
100 | ||
101 | /* Create a new four word stack frame, discarding the old one. */ | |
102 | regs->stkadj = frame_extra_sizes(regs->format); | |
103 | tregs = (struct pt_regs *)((long)regs + regs->stkadj); | |
104 | tregs->vector = regs->vector; | |
105 | tregs->format = FORMAT; | |
106 | tregs->pc = fixup->fixup; | |
107 | tregs->sr = regs->sr; | |
108 | ||
109 | return 1; | |
110 | } | |
111 | ||
b7f9591c | 112 | void ptrace_signal_deliver(void) |
0c22fafd | 113 | { |
b7f9591c | 114 | struct pt_regs *regs = signal_pt_regs(); |
0c22fafd GU |
115 | if (regs->orig_d0 < 0) |
116 | return; | |
117 | switch (regs->d0) { | |
118 | case -ERESTARTNOHAND: | |
119 | case -ERESTARTSYS: | |
120 | case -ERESTARTNOINTR: | |
121 | regs->d0 = regs->orig_d0; | |
122 | regs->orig_d0 = -1; | |
123 | regs->pc -= 2; | |
124 | break; | |
125 | } | |
126 | } | |
127 | ||
128 | static inline void push_cache (unsigned long vaddr) | |
129 | { | |
130 | /* | |
131 | * Using the old cache_push_v() was really a big waste. | |
132 | * | |
133 | * What we are trying to do is to flush 8 bytes to ram. | |
134 | * Flushing 2 cache lines of 16 bytes is much cheaper than | |
135 | * flushing 1 or 2 pages, as previously done in | |
136 | * cache_push_v(). | |
137 | * Jes | |
138 | */ | |
139 | if (CPU_IS_040) { | |
140 | unsigned long temp; | |
141 | ||
142 | __asm__ __volatile__ (".chip 68040\n\t" | |
143 | "nop\n\t" | |
144 | "ptestr (%1)\n\t" | |
145 | "movec %%mmusr,%0\n\t" | |
146 | ".chip 68k" | |
147 | : "=r" (temp) | |
148 | : "a" (vaddr)); | |
149 | ||
150 | temp &= PAGE_MASK; | |
151 | temp |= vaddr & ~PAGE_MASK; | |
152 | ||
153 | __asm__ __volatile__ (".chip 68040\n\t" | |
154 | "nop\n\t" | |
155 | "cpushl %%bc,(%0)\n\t" | |
156 | ".chip 68k" | |
157 | : : "a" (temp)); | |
158 | } | |
159 | else if (CPU_IS_060) { | |
160 | unsigned long temp; | |
161 | __asm__ __volatile__ (".chip 68060\n\t" | |
162 | "plpar (%0)\n\t" | |
163 | ".chip 68k" | |
164 | : "=a" (temp) | |
165 | : "0" (vaddr)); | |
166 | __asm__ __volatile__ (".chip 68060\n\t" | |
167 | "cpushl %%bc,(%0)\n\t" | |
168 | ".chip 68k" | |
169 | : : "a" (temp)); | |
170 | } else if (!CPU_IS_COLDFIRE) { | |
171 | /* | |
172 | * 68030/68020 have no writeback cache; | |
173 | * still need to clear icache. | |
174 | * Note that vaddr is guaranteed to be long word aligned. | |
175 | */ | |
176 | unsigned long temp; | |
177 | asm volatile ("movec %%cacr,%0" : "=r" (temp)); | |
178 | temp += 4; | |
179 | asm volatile ("movec %0,%%caar\n\t" | |
180 | "movec %1,%%cacr" | |
181 | : : "r" (vaddr), "r" (temp)); | |
182 | asm volatile ("movec %0,%%caar\n\t" | |
183 | "movec %1,%%cacr" | |
184 | : : "r" (vaddr + 4), "r" (temp)); | |
42cb38bc AS |
185 | } else { |
186 | /* CPU_IS_COLDFIRE */ | |
187 | #if defined(CONFIG_CACHE_COPYBACK) | |
188 | flush_cf_dcache(0, DCACHE_MAX_ADDR); | |
189 | #endif | |
190 | /* Invalidate instruction cache for the pushed bytes */ | |
191 | clear_cf_icache(vaddr, vaddr + 8); | |
0c22fafd GU |
192 | } |
193 | } | |
194 | ||
195 | static inline void adjustformat(struct pt_regs *regs) | |
196 | { | |
197 | } | |
198 | ||
199 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
200 | { | |
201 | } | |
202 | ||
203 | #else /* CONFIG_MMU */ | |
204 | ||
205 | void ret_from_user_signal(void); | |
206 | void ret_from_user_rt_signal(void); | |
207 | ||
208 | static inline int frame_extra_sizes(int f) | |
209 | { | |
210 | /* No frame size adjustments required on non-MMU CPUs */ | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static inline void adjustformat(struct pt_regs *regs) | |
215 | { | |
0c22fafd GU |
216 | /* |
217 | * set format byte to make stack appear modulo 4, which it will | |
218 | * be when doing the rte | |
219 | */ | |
220 | regs->format = 0x4; | |
221 | } | |
222 | ||
223 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
224 | { | |
225 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; | |
226 | } | |
227 | ||
228 | static inline void push_cache(unsigned long vaddr) | |
229 | { | |
230 | } | |
231 | ||
232 | #endif /* CONFIG_MMU */ | |
233 | ||
0c22fafd GU |
234 | /* |
235 | * Do a signal return; undo the signal stack. | |
236 | * | |
237 | * Keep the return code on the stack quadword aligned! | |
238 | * That makes the cache flush below easier. | |
239 | */ | |
240 | ||
241 | struct sigframe | |
242 | { | |
243 | char __user *pretcode; | |
244 | int sig; | |
245 | int code; | |
246 | struct sigcontext __user *psc; | |
247 | char retcode[8]; | |
248 | unsigned long extramask[_NSIG_WORDS-1]; | |
249 | struct sigcontext sc; | |
250 | }; | |
251 | ||
252 | struct rt_sigframe | |
253 | { | |
254 | char __user *pretcode; | |
255 | int sig; | |
256 | struct siginfo __user *pinfo; | |
257 | void __user *puc; | |
258 | char retcode[8]; | |
259 | struct siginfo info; | |
260 | struct ucontext uc; | |
261 | }; | |
262 | ||
263 | #define FPCONTEXT_SIZE 216 | |
264 | #define uc_fpstate uc_filler[0] | |
265 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] | |
266 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] | |
267 | ||
268 | #ifdef CONFIG_FPU | |
269 | ||
270 | static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ | |
271 | ||
272 | static inline int restore_fpu_state(struct sigcontext *sc) | |
273 | { | |
274 | int err = 1; | |
275 | ||
276 | if (FPU_IS_EMU) { | |
277 | /* restore registers */ | |
278 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); | |
279 | memcpy(current->thread.fp, sc->sc_fpregs, 24); | |
280 | return 0; | |
281 | } | |
282 | ||
283 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
284 | /* Verify the frame format. */ | |
285 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
286 | (sc->sc_fpstate[0] != fpu_version)) | |
287 | goto out; | |
288 | if (CPU_IS_020_OR_030) { | |
289 | if (m68k_fputype & FPU_68881 && | |
290 | !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) | |
291 | goto out; | |
292 | if (m68k_fputype & FPU_68882 && | |
293 | !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) | |
294 | goto out; | |
295 | } else if (CPU_IS_040) { | |
296 | if (!(sc->sc_fpstate[1] == 0x00 || | |
297 | sc->sc_fpstate[1] == 0x28 || | |
298 | sc->sc_fpstate[1] == 0x60)) | |
299 | goto out; | |
300 | } else if (CPU_IS_060) { | |
301 | if (!(sc->sc_fpstate[3] == 0x00 || | |
302 | sc->sc_fpstate[3] == 0x60 || | |
303 | sc->sc_fpstate[3] == 0xe0)) | |
304 | goto out; | |
305 | } else if (CPU_IS_COLDFIRE) { | |
306 | if (!(sc->sc_fpstate[0] == 0x00 || | |
307 | sc->sc_fpstate[0] == 0x05 || | |
308 | sc->sc_fpstate[0] == 0xe5)) | |
309 | goto out; | |
310 | } else | |
311 | goto out; | |
312 | ||
313 | if (CPU_IS_COLDFIRE) { | |
314 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" | |
315 | "fmovel %1,%%fpcr\n\t" | |
316 | "fmovel %2,%%fpsr\n\t" | |
317 | "fmovel %3,%%fpiar" | |
318 | : /* no outputs */ | |
319 | : "m" (sc->sc_fpregs[0]), | |
320 | "m" (sc->sc_fpcntl[0]), | |
321 | "m" (sc->sc_fpcntl[1]), | |
322 | "m" (sc->sc_fpcntl[2])); | |
323 | } else { | |
324 | __asm__ volatile (".chip 68k/68881\n\t" | |
325 | "fmovemx %0,%%fp0-%%fp1\n\t" | |
326 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
327 | ".chip 68k" | |
328 | : /* no outputs */ | |
329 | : "m" (*sc->sc_fpregs), | |
330 | "m" (*sc->sc_fpcntl)); | |
331 | } | |
332 | } | |
333 | ||
334 | if (CPU_IS_COLDFIRE) { | |
335 | __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); | |
336 | } else { | |
337 | __asm__ volatile (".chip 68k/68881\n\t" | |
338 | "frestore %0\n\t" | |
339 | ".chip 68k" | |
340 | : : "m" (*sc->sc_fpstate)); | |
341 | } | |
342 | err = 0; | |
343 | ||
344 | out: | |
345 | return err; | |
346 | } | |
347 | ||
348 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
349 | { | |
350 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
351 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
352 | fpregset_t fpregs; | |
353 | int err = 1; | |
354 | ||
355 | if (FPU_IS_EMU) { | |
356 | /* restore fpu control register */ | |
357 | if (__copy_from_user(current->thread.fpcntl, | |
358 | uc->uc_mcontext.fpregs.f_fpcntl, 12)) | |
359 | goto out; | |
360 | /* restore all other fpu register */ | |
361 | if (__copy_from_user(current->thread.fp, | |
362 | uc->uc_mcontext.fpregs.f_fpregs, 96)) | |
363 | goto out; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) | |
368 | goto out; | |
369 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
370 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
371 | context_size = fpstate[1]; | |
372 | /* Verify the frame format. */ | |
373 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
374 | (fpstate[0] != fpu_version)) | |
375 | goto out; | |
376 | if (CPU_IS_020_OR_030) { | |
377 | if (m68k_fputype & FPU_68881 && | |
378 | !(context_size == 0x18 || context_size == 0xb4)) | |
379 | goto out; | |
380 | if (m68k_fputype & FPU_68882 && | |
381 | !(context_size == 0x38 || context_size == 0xd4)) | |
382 | goto out; | |
383 | } else if (CPU_IS_040) { | |
384 | if (!(context_size == 0x00 || | |
385 | context_size == 0x28 || | |
386 | context_size == 0x60)) | |
387 | goto out; | |
388 | } else if (CPU_IS_060) { | |
389 | if (!(fpstate[3] == 0x00 || | |
390 | fpstate[3] == 0x60 || | |
391 | fpstate[3] == 0xe0)) | |
392 | goto out; | |
393 | } else if (CPU_IS_COLDFIRE) { | |
394 | if (!(fpstate[3] == 0x00 || | |
395 | fpstate[3] == 0x05 || | |
396 | fpstate[3] == 0xe5)) | |
397 | goto out; | |
398 | } else | |
399 | goto out; | |
400 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, | |
401 | sizeof(fpregs))) | |
402 | goto out; | |
403 | ||
404 | if (CPU_IS_COLDFIRE) { | |
405 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" | |
406 | "fmovel %1,%%fpcr\n\t" | |
407 | "fmovel %2,%%fpsr\n\t" | |
408 | "fmovel %3,%%fpiar" | |
409 | : /* no outputs */ | |
410 | : "m" (fpregs.f_fpregs[0]), | |
411 | "m" (fpregs.f_fpcntl[0]), | |
412 | "m" (fpregs.f_fpcntl[1]), | |
413 | "m" (fpregs.f_fpcntl[2])); | |
414 | } else { | |
415 | __asm__ volatile (".chip 68k/68881\n\t" | |
416 | "fmovemx %0,%%fp0-%%fp7\n\t" | |
417 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
418 | ".chip 68k" | |
419 | : /* no outputs */ | |
420 | : "m" (*fpregs.f_fpregs), | |
421 | "m" (*fpregs.f_fpcntl)); | |
422 | } | |
423 | } | |
424 | if (context_size && | |
425 | __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, | |
426 | context_size)) | |
427 | goto out; | |
428 | ||
429 | if (CPU_IS_COLDFIRE) { | |
430 | __asm__ volatile ("frestore %0" : : "m" (*fpstate)); | |
431 | } else { | |
432 | __asm__ volatile (".chip 68k/68881\n\t" | |
433 | "frestore %0\n\t" | |
434 | ".chip 68k" | |
435 | : : "m" (*fpstate)); | |
436 | } | |
437 | err = 0; | |
438 | ||
439 | out: | |
440 | return err; | |
441 | } | |
442 | ||
443 | /* | |
444 | * Set up a signal frame. | |
445 | */ | |
446 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
447 | { | |
448 | if (FPU_IS_EMU) { | |
449 | /* save registers */ | |
450 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); | |
451 | memcpy(sc->sc_fpregs, current->thread.fp, 24); | |
452 | return; | |
453 | } | |
454 | ||
455 | if (CPU_IS_COLDFIRE) { | |
456 | __asm__ volatile ("fsave %0" | |
457 | : : "m" (*sc->sc_fpstate) : "memory"); | |
458 | } else { | |
459 | __asm__ volatile (".chip 68k/68881\n\t" | |
460 | "fsave %0\n\t" | |
461 | ".chip 68k" | |
462 | : : "m" (*sc->sc_fpstate) : "memory"); | |
463 | } | |
464 | ||
465 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
466 | fpu_version = sc->sc_fpstate[0]; | |
467 | if (CPU_IS_020_OR_030 && | |
468 | regs->vector >= (VEC_FPBRUC * 4) && | |
469 | regs->vector <= (VEC_FPNAN * 4)) { | |
470 | /* Clear pending exception in 68882 idle frame */ | |
471 | if (*(unsigned short *) sc->sc_fpstate == 0x1f38) | |
472 | sc->sc_fpstate[0x38] |= 1 << 3; | |
473 | } | |
474 | ||
475 | if (CPU_IS_COLDFIRE) { | |
476 | __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" | |
477 | "fmovel %%fpcr,%1\n\t" | |
478 | "fmovel %%fpsr,%2\n\t" | |
479 | "fmovel %%fpiar,%3" | |
480 | : "=m" (sc->sc_fpregs[0]), | |
481 | "=m" (sc->sc_fpcntl[0]), | |
482 | "=m" (sc->sc_fpcntl[1]), | |
483 | "=m" (sc->sc_fpcntl[2]) | |
484 | : /* no inputs */ | |
485 | : "memory"); | |
486 | } else { | |
487 | __asm__ volatile (".chip 68k/68881\n\t" | |
488 | "fmovemx %%fp0-%%fp1,%0\n\t" | |
489 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
490 | ".chip 68k" | |
491 | : "=m" (*sc->sc_fpregs), | |
492 | "=m" (*sc->sc_fpcntl) | |
493 | : /* no inputs */ | |
494 | : "memory"); | |
495 | } | |
496 | } | |
497 | } | |
498 | ||
499 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
500 | { | |
501 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
502 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
503 | int err = 0; | |
504 | ||
505 | if (FPU_IS_EMU) { | |
506 | /* save fpu control register */ | |
507 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, | |
508 | current->thread.fpcntl, 12); | |
509 | /* save all other fpu register */ | |
510 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, | |
511 | current->thread.fp, 96); | |
512 | return err; | |
513 | } | |
514 | ||
515 | if (CPU_IS_COLDFIRE) { | |
516 | __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); | |
517 | } else { | |
518 | __asm__ volatile (".chip 68k/68881\n\t" | |
519 | "fsave %0\n\t" | |
520 | ".chip 68k" | |
521 | : : "m" (*fpstate) : "memory"); | |
522 | } | |
523 | ||
524 | err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); | |
525 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
526 | fpregset_t fpregs; | |
527 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
528 | context_size = fpstate[1]; | |
529 | fpu_version = fpstate[0]; | |
530 | if (CPU_IS_020_OR_030 && | |
531 | regs->vector >= (VEC_FPBRUC * 4) && | |
532 | regs->vector <= (VEC_FPNAN * 4)) { | |
533 | /* Clear pending exception in 68882 idle frame */ | |
534 | if (*(unsigned short *) fpstate == 0x1f38) | |
535 | fpstate[0x38] |= 1 << 3; | |
536 | } | |
537 | if (CPU_IS_COLDFIRE) { | |
538 | __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" | |
539 | "fmovel %%fpcr,%1\n\t" | |
540 | "fmovel %%fpsr,%2\n\t" | |
541 | "fmovel %%fpiar,%3" | |
542 | : "=m" (fpregs.f_fpregs[0]), | |
543 | "=m" (fpregs.f_fpcntl[0]), | |
544 | "=m" (fpregs.f_fpcntl[1]), | |
545 | "=m" (fpregs.f_fpcntl[2]) | |
546 | : /* no inputs */ | |
547 | : "memory"); | |
548 | } else { | |
549 | __asm__ volatile (".chip 68k/68881\n\t" | |
550 | "fmovemx %%fp0-%%fp7,%0\n\t" | |
551 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
552 | ".chip 68k" | |
553 | : "=m" (*fpregs.f_fpregs), | |
554 | "=m" (*fpregs.f_fpcntl) | |
555 | : /* no inputs */ | |
556 | : "memory"); | |
557 | } | |
558 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, | |
559 | sizeof(fpregs)); | |
560 | } | |
561 | if (context_size) | |
562 | err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, | |
563 | context_size); | |
564 | return err; | |
565 | } | |
566 | ||
567 | #else /* CONFIG_FPU */ | |
568 | ||
569 | /* | |
570 | * For the case with no FPU configured these all do nothing. | |
571 | */ | |
572 | static inline int restore_fpu_state(struct sigcontext *sc) | |
573 | { | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
578 | { | |
579 | return 0; | |
580 | } | |
581 | ||
582 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
583 | { | |
584 | } | |
585 | ||
586 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
587 | { | |
588 | return 0; | |
589 | } | |
590 | ||
591 | #endif /* CONFIG_FPU */ | |
592 | ||
593 | static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, | |
594 | void __user *fp) | |
595 | { | |
596 | int fsize = frame_extra_sizes(formatvec >> 12); | |
597 | if (fsize < 0) { | |
598 | /* | |
599 | * user process trying to return with weird frame format | |
600 | */ | |
601 | #ifdef DEBUG | |
602 | printk("user process returning with weird frame format\n"); | |
603 | #endif | |
604 | return 1; | |
605 | } | |
606 | if (!fsize) { | |
607 | regs->format = formatvec >> 12; | |
608 | regs->vector = formatvec & 0xfff; | |
609 | } else { | |
610 | struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
611 | unsigned long buf[fsize / 2]; /* yes, twice as much */ | |
612 | ||
613 | /* that'll make sure that expansion won't crap over data */ | |
614 | if (copy_from_user(buf + fsize / 4, fp, fsize)) | |
615 | return 1; | |
616 | ||
617 | /* point of no return */ | |
618 | regs->format = formatvec >> 12; | |
619 | regs->vector = formatvec & 0xfff; | |
620 | #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) | |
621 | __asm__ __volatile__ ( | |
622 | #ifdef CONFIG_COLDFIRE | |
623 | " movel %0,%/sp\n\t" | |
624 | " bra ret_from_signal\n" | |
625 | #else | |
626 | " movel %0,%/a0\n\t" | |
627 | " subl %1,%/a0\n\t" /* make room on stack */ | |
628 | " movel %/a0,%/sp\n\t" /* set stack pointer */ | |
629 | /* move switch_stack and pt_regs */ | |
630 | "1: movel %0@+,%/a0@+\n\t" | |
631 | " dbra %2,1b\n\t" | |
632 | " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ | |
633 | " lsrl #2,%1\n\t" | |
634 | " subql #1,%1\n\t" | |
635 | /* copy to the gap we'd made */ | |
636 | "2: movel %4@+,%/a0@+\n\t" | |
637 | " dbra %1,2b\n\t" | |
638 | " bral ret_from_signal\n" | |
639 | #endif | |
640 | : /* no outputs, it doesn't ever return */ | |
641 | : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), | |
642 | "n" (frame_offset), "a" (buf + fsize/4) | |
643 | : "a0"); | |
644 | #undef frame_offset | |
645 | } | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static inline int | |
650 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) | |
651 | { | |
652 | int formatvec; | |
653 | struct sigcontext context; | |
654 | int err = 0; | |
655 | ||
656 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 657 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
658 | |
659 | /* get previous context */ | |
660 | if (copy_from_user(&context, usc, sizeof(context))) | |
661 | goto badframe; | |
662 | ||
663 | /* restore passed registers */ | |
664 | regs->d0 = context.sc_d0; | |
665 | regs->d1 = context.sc_d1; | |
666 | regs->a0 = context.sc_a0; | |
667 | regs->a1 = context.sc_a1; | |
668 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); | |
669 | regs->pc = context.sc_pc; | |
670 | regs->orig_d0 = -1; /* disable syscall checks */ | |
671 | wrusp(context.sc_usp); | |
672 | formatvec = context.sc_formatvec; | |
673 | ||
674 | err = restore_fpu_state(&context); | |
675 | ||
676 | if (err || mangle_kernel_stack(regs, formatvec, fp)) | |
677 | goto badframe; | |
678 | ||
679 | return 0; | |
680 | ||
681 | badframe: | |
682 | return 1; | |
683 | } | |
684 | ||
685 | static inline int | |
686 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, | |
687 | struct ucontext __user *uc) | |
688 | { | |
689 | int temp; | |
690 | greg_t __user *gregs = uc->uc_mcontext.gregs; | |
691 | unsigned long usp; | |
692 | int err; | |
693 | ||
694 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 695 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
696 | |
697 | err = __get_user(temp, &uc->uc_mcontext.version); | |
698 | if (temp != MCONTEXT_VERSION) | |
699 | goto badframe; | |
700 | /* restore passed registers */ | |
701 | err |= __get_user(regs->d0, &gregs[0]); | |
702 | err |= __get_user(regs->d1, &gregs[1]); | |
703 | err |= __get_user(regs->d2, &gregs[2]); | |
704 | err |= __get_user(regs->d3, &gregs[3]); | |
705 | err |= __get_user(regs->d4, &gregs[4]); | |
706 | err |= __get_user(regs->d5, &gregs[5]); | |
707 | err |= __get_user(sw->d6, &gregs[6]); | |
708 | err |= __get_user(sw->d7, &gregs[7]); | |
709 | err |= __get_user(regs->a0, &gregs[8]); | |
710 | err |= __get_user(regs->a1, &gregs[9]); | |
711 | err |= __get_user(regs->a2, &gregs[10]); | |
712 | err |= __get_user(sw->a3, &gregs[11]); | |
713 | err |= __get_user(sw->a4, &gregs[12]); | |
714 | err |= __get_user(sw->a5, &gregs[13]); | |
715 | err |= __get_user(sw->a6, &gregs[14]); | |
716 | err |= __get_user(usp, &gregs[15]); | |
717 | wrusp(usp); | |
718 | err |= __get_user(regs->pc, &gregs[16]); | |
719 | err |= __get_user(temp, &gregs[17]); | |
720 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); | |
721 | regs->orig_d0 = -1; /* disable syscall checks */ | |
722 | err |= __get_user(temp, &uc->uc_formatvec); | |
723 | ||
724 | err |= rt_restore_fpu_state(uc); | |
08d4f653 | 725 | err |= restore_altstack(&uc->uc_stack); |
0c22fafd | 726 | |
08d4f653 | 727 | if (err) |
0c22fafd GU |
728 | goto badframe; |
729 | ||
730 | if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) | |
731 | goto badframe; | |
732 | ||
733 | return 0; | |
734 | ||
735 | badframe: | |
736 | return 1; | |
737 | } | |
738 | ||
a9551799 | 739 | asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 740 | { |
0c22fafd GU |
741 | unsigned long usp = rdusp(); |
742 | struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); | |
743 | sigset_t set; | |
744 | ||
745 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
746 | goto badframe; | |
747 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || | |
748 | (_NSIG_WORDS > 1 && | |
749 | __copy_from_user(&set.sig[1], &frame->extramask, | |
750 | sizeof(frame->extramask)))) | |
751 | goto badframe; | |
752 | ||
43a35995 | 753 | set_current_blocked(&set); |
0c22fafd GU |
754 | |
755 | if (restore_sigcontext(regs, &frame->sc, frame + 1)) | |
756 | goto badframe; | |
757 | return regs->d0; | |
758 | ||
759 | badframe: | |
760 | force_sig(SIGSEGV, current); | |
761 | return 0; | |
762 | } | |
763 | ||
a9551799 | 764 | asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 765 | { |
0c22fafd GU |
766 | unsigned long usp = rdusp(); |
767 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); | |
768 | sigset_t set; | |
769 | ||
770 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
771 | goto badframe; | |
772 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
773 | goto badframe; | |
774 | ||
43a35995 | 775 | set_current_blocked(&set); |
0c22fafd GU |
776 | |
777 | if (rt_restore_ucontext(regs, sw, &frame->uc)) | |
778 | goto badframe; | |
779 | return regs->d0; | |
780 | ||
781 | badframe: | |
782 | force_sig(SIGSEGV, current); | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, | |
787 | unsigned long mask) | |
788 | { | |
789 | sc->sc_mask = mask; | |
790 | sc->sc_usp = rdusp(); | |
791 | sc->sc_d0 = regs->d0; | |
792 | sc->sc_d1 = regs->d1; | |
793 | sc->sc_a0 = regs->a0; | |
794 | sc->sc_a1 = regs->a1; | |
795 | sc->sc_sr = regs->sr; | |
796 | sc->sc_pc = regs->pc; | |
797 | sc->sc_formatvec = regs->format << 12 | regs->vector; | |
798 | save_a5_state(sc, regs); | |
799 | save_fpu_state(sc, regs); | |
800 | } | |
801 | ||
802 | static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) | |
803 | { | |
804 | struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
805 | greg_t __user *gregs = uc->uc_mcontext.gregs; | |
806 | int err = 0; | |
807 | ||
808 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); | |
809 | err |= __put_user(regs->d0, &gregs[0]); | |
810 | err |= __put_user(regs->d1, &gregs[1]); | |
811 | err |= __put_user(regs->d2, &gregs[2]); | |
812 | err |= __put_user(regs->d3, &gregs[3]); | |
813 | err |= __put_user(regs->d4, &gregs[4]); | |
814 | err |= __put_user(regs->d5, &gregs[5]); | |
815 | err |= __put_user(sw->d6, &gregs[6]); | |
816 | err |= __put_user(sw->d7, &gregs[7]); | |
817 | err |= __put_user(regs->a0, &gregs[8]); | |
818 | err |= __put_user(regs->a1, &gregs[9]); | |
819 | err |= __put_user(regs->a2, &gregs[10]); | |
820 | err |= __put_user(sw->a3, &gregs[11]); | |
821 | err |= __put_user(sw->a4, &gregs[12]); | |
822 | err |= __put_user(sw->a5, &gregs[13]); | |
823 | err |= __put_user(sw->a6, &gregs[14]); | |
824 | err |= __put_user(rdusp(), &gregs[15]); | |
825 | err |= __put_user(regs->pc, &gregs[16]); | |
826 | err |= __put_user(regs->sr, &gregs[17]); | |
827 | err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); | |
828 | err |= rt_save_fpu_state(uc, regs); | |
829 | return err; | |
830 | } | |
831 | ||
832 | static inline void __user * | |
36992f28 | 833 | get_sigframe(struct ksignal *ksig, size_t frame_size) |
0c22fafd | 834 | { |
36992f28 | 835 | unsigned long usp = sigsp(rdusp(), ksig); |
0c22fafd | 836 | |
0c22fafd GU |
837 | return (void __user *)((usp - frame_size) & -8UL); |
838 | } | |
839 | ||
0d97500d RW |
840 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
841 | struct pt_regs *regs) | |
0c22fafd GU |
842 | { |
843 | struct sigframe __user *frame; | |
844 | int fsize = frame_extra_sizes(regs->format); | |
845 | struct sigcontext context; | |
0d97500d | 846 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
847 | |
848 | if (fsize < 0) { | |
849 | #ifdef DEBUG | |
850 | printk ("setup_frame: Unknown frame format %#x\n", | |
851 | regs->format); | |
852 | #endif | |
0d97500d | 853 | return -EFAULT; |
0c22fafd GU |
854 | } |
855 | ||
36992f28 | 856 | frame = get_sigframe(ksig, sizeof(*frame) + fsize); |
0c22fafd GU |
857 | |
858 | if (fsize) | |
859 | err |= copy_to_user (frame + 1, regs + 1, fsize); | |
860 | ||
a0075cd1 | 861 | err |= __put_user(sig, &frame->sig); |
0c22fafd GU |
862 | |
863 | err |= __put_user(regs->vector, &frame->code); | |
864 | err |= __put_user(&frame->sc, &frame->psc); | |
865 | ||
866 | if (_NSIG_WORDS > 1) | |
867 | err |= copy_to_user(frame->extramask, &set->sig[1], | |
868 | sizeof(frame->extramask)); | |
869 | ||
870 | setup_sigcontext(&context, regs, set->sig[0]); | |
871 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); | |
872 | ||
873 | /* Set up to return from userspace. */ | |
874 | #ifdef CONFIG_MMU | |
875 | err |= __put_user(frame->retcode, &frame->pretcode); | |
876 | /* moveq #,d0; trap #0 */ | |
877 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), | |
878 | (long __user *)(frame->retcode)); | |
879 | #else | |
880 | err |= __put_user((void *) ret_from_user_signal, &frame->pretcode); | |
881 | #endif | |
882 | ||
883 | if (err) | |
0d97500d | 884 | return -EFAULT; |
0c22fafd GU |
885 | |
886 | push_cache ((unsigned long) &frame->retcode); | |
887 | ||
888 | /* | |
889 | * Set up registers for signal handler. All the state we are about | |
890 | * to destroy is successfully copied to sigframe. | |
891 | */ | |
892 | wrusp ((unsigned long) frame); | |
0d97500d | 893 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
0c22fafd GU |
894 | adjustformat(regs); |
895 | ||
896 | /* | |
897 | * This is subtle; if we build more than one sigframe, all but the | |
898 | * first one will see frame format 0 and have fsize == 0, so we won't | |
899 | * screw stkadj. | |
900 | */ | |
901 | if (fsize) | |
902 | regs->stkadj = fsize; | |
903 | ||
904 | /* Prepare to skip over the extra stuff in the exception frame. */ | |
905 | if (regs->stkadj) { | |
906 | struct pt_regs *tregs = | |
907 | (struct pt_regs *)((ulong)regs + regs->stkadj); | |
908 | #ifdef DEBUG | |
909 | printk("Performing stackadjust=%04x\n", regs->stkadj); | |
910 | #endif | |
911 | /* This must be copied with decreasing addresses to | |
912 | handle overlaps. */ | |
913 | tregs->vector = 0; | |
914 | tregs->format = 0; | |
915 | tregs->pc = regs->pc; | |
916 | tregs->sr = regs->sr; | |
917 | } | |
918 | return 0; | |
0c22fafd GU |
919 | } |
920 | ||
0d97500d RW |
921 | static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
922 | struct pt_regs *regs) | |
0c22fafd GU |
923 | { |
924 | struct rt_sigframe __user *frame; | |
925 | int fsize = frame_extra_sizes(regs->format); | |
0d97500d | 926 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
927 | |
928 | if (fsize < 0) { | |
929 | #ifdef DEBUG | |
930 | printk ("setup_frame: Unknown frame format %#x\n", | |
931 | regs->format); | |
932 | #endif | |
0d97500d | 933 | return -EFAULT; |
0c22fafd GU |
934 | } |
935 | ||
36992f28 | 936 | frame = get_sigframe(ksig, sizeof(*frame)); |
0c22fafd GU |
937 | |
938 | if (fsize) | |
939 | err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); | |
940 | ||
a0075cd1 | 941 | err |= __put_user(sig, &frame->sig); |
0c22fafd GU |
942 | err |= __put_user(&frame->info, &frame->pinfo); |
943 | err |= __put_user(&frame->uc, &frame->puc); | |
0d97500d | 944 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
0c22fafd GU |
945 | |
946 | /* Create the ucontext. */ | |
947 | err |= __put_user(0, &frame->uc.uc_flags); | |
948 | err |= __put_user(NULL, &frame->uc.uc_link); | |
08d4f653 | 949 | err |= __save_altstack(&frame->uc.uc_stack, rdusp()); |
0c22fafd GU |
950 | err |= rt_setup_ucontext(&frame->uc, regs); |
951 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); | |
952 | ||
953 | /* Set up to return from userspace. */ | |
954 | #ifdef CONFIG_MMU | |
955 | err |= __put_user(frame->retcode, &frame->pretcode); | |
956 | #ifdef __mcoldfire__ | |
957 | /* movel #__NR_rt_sigreturn,d0; trap #0 */ | |
958 | err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); | |
959 | err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), | |
960 | (long __user *)(frame->retcode + 4)); | |
961 | #else | |
962 | /* moveq #,d0; notb d0; trap #0 */ | |
963 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), | |
964 | (long __user *)(frame->retcode + 0)); | |
965 | err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); | |
966 | #endif | |
967 | #else | |
968 | err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode); | |
969 | #endif /* CONFIG_MMU */ | |
970 | ||
971 | if (err) | |
0d97500d | 972 | return -EFAULT; |
0c22fafd GU |
973 | |
974 | push_cache ((unsigned long) &frame->retcode); | |
975 | ||
976 | /* | |
977 | * Set up registers for signal handler. All the state we are about | |
978 | * to destroy is successfully copied to sigframe. | |
979 | */ | |
980 | wrusp ((unsigned long) frame); | |
0d97500d | 981 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
0c22fafd GU |
982 | adjustformat(regs); |
983 | ||
984 | /* | |
985 | * This is subtle; if we build more than one sigframe, all but the | |
986 | * first one will see frame format 0 and have fsize == 0, so we won't | |
987 | * screw stkadj. | |
988 | */ | |
989 | if (fsize) | |
990 | regs->stkadj = fsize; | |
991 | ||
992 | /* Prepare to skip over the extra stuff in the exception frame. */ | |
993 | if (regs->stkadj) { | |
994 | struct pt_regs *tregs = | |
995 | (struct pt_regs *)((ulong)regs + regs->stkadj); | |
996 | #ifdef DEBUG | |
997 | printk("Performing stackadjust=%04x\n", regs->stkadj); | |
998 | #endif | |
999 | /* This must be copied with decreasing addresses to | |
1000 | handle overlaps. */ | |
1001 | tregs->vector = 0; | |
1002 | tregs->format = 0; | |
1003 | tregs->pc = regs->pc; | |
1004 | tregs->sr = regs->sr; | |
1005 | } | |
1006 | return 0; | |
0c22fafd GU |
1007 | } |
1008 | ||
1009 | static inline void | |
1010 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) | |
1011 | { | |
1012 | switch (regs->d0) { | |
1013 | case -ERESTARTNOHAND: | |
1014 | if (!has_handler) | |
1015 | goto do_restart; | |
1016 | regs->d0 = -EINTR; | |
1017 | break; | |
1018 | ||
1019 | case -ERESTART_RESTARTBLOCK: | |
1020 | if (!has_handler) { | |
1021 | regs->d0 = __NR_restart_syscall; | |
1022 | regs->pc -= 2; | |
1023 | break; | |
1024 | } | |
1025 | regs->d0 = -EINTR; | |
1026 | break; | |
1027 | ||
1028 | case -ERESTARTSYS: | |
1029 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { | |
1030 | regs->d0 = -EINTR; | |
1031 | break; | |
1032 | } | |
1033 | /* fallthrough */ | |
1034 | case -ERESTARTNOINTR: | |
1035 | do_restart: | |
1036 | regs->d0 = regs->orig_d0; | |
1037 | regs->pc -= 2; | |
1038 | break; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * OK, we're invoking a handler | |
1044 | */ | |
1045 | static void | |
0d97500d | 1046 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
0c22fafd | 1047 | { |
b7f9a11a | 1048 | sigset_t *oldset = sigmask_to_save(); |
0c22fafd GU |
1049 | int err; |
1050 | /* are we from a system call? */ | |
1051 | if (regs->orig_d0 >= 0) | |
1052 | /* If so, check system call restarting.. */ | |
0d97500d | 1053 | handle_restart(regs, &ksig->ka, 1); |
0c22fafd GU |
1054 | |
1055 | /* set up the stack frame */ | |
0d97500d RW |
1056 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
1057 | err = setup_rt_frame(ksig, oldset, regs); | |
0c22fafd | 1058 | else |
0d97500d | 1059 | err = setup_frame(ksig, oldset, regs); |
0c22fafd | 1060 | |
0d97500d | 1061 | signal_setup_done(err, ksig, 0); |
0c22fafd GU |
1062 | |
1063 | if (test_thread_flag(TIF_DELAYED_TRACE)) { | |
1064 | regs->sr &= ~0x8000; | |
1065 | send_sig(SIGTRAP, current, 1); | |
1066 | } | |
0c22fafd GU |
1067 | } |
1068 | ||
1069 | /* | |
1070 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1071 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1072 | * mistake. | |
1073 | */ | |
a54f1655 | 1074 | static void do_signal(struct pt_regs *regs) |
0c22fafd | 1075 | { |
0d97500d | 1076 | struct ksignal ksig; |
0c22fafd GU |
1077 | |
1078 | current->thread.esp0 = (unsigned long) regs; | |
1079 | ||
0d97500d | 1080 | if (get_signal(&ksig)) { |
0c22fafd | 1081 | /* Whee! Actually deliver the signal. */ |
0d97500d | 1082 | handle_signal(&ksig, regs); |
0c22fafd GU |
1083 | return; |
1084 | } | |
1085 | ||
1086 | /* Did we come from a system call? */ | |
1087 | if (regs->orig_d0 >= 0) | |
1088 | /* Restart the system call - no handlers present */ | |
1089 | handle_restart(regs, NULL, 0); | |
1090 | ||
1091 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 1092 | restore_saved_sigmask(); |
0c22fafd | 1093 | } |
a54f1655 AV |
1094 | |
1095 | void do_notify_resume(struct pt_regs *regs) | |
1096 | { | |
1097 | if (test_thread_flag(TIF_SIGPENDING)) | |
1098 | do_signal(regs); | |
1099 | ||
a42c6ded | 1100 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
a54f1655 | 1101 | tracehook_notify_resume(regs); |
a54f1655 | 1102 | } |