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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> | |
6736e65e | 45 | #include <linux/extable.h> |
03248add | 46 | #include <linux/resume_user_mode.h> |
0c22fafd GU |
47 | |
48 | #include <asm/setup.h> | |
7c0f6ba6 | 49 | #include <linux/uaccess.h> |
0c22fafd GU |
50 | #include <asm/traps.h> |
51 | #include <asm/ucontext.h> | |
42cb38bc | 52 | #include <asm/cacheflush.h> |
0c22fafd | 53 | |
66d857b0 | 54 | #ifdef CONFIG_MMU |
0c22fafd GU |
55 | |
56 | /* | |
57 | * Handle the slight differences in classic 68k and ColdFire trap frames. | |
58 | */ | |
59 | #ifdef CONFIG_COLDFIRE | |
60 | #define FORMAT 4 | |
61 | #define FMT4SIZE 0 | |
00ebfe58 | 62 | #else |
0c22fafd | 63 | #define FORMAT 0 |
5f5f2949 | 64 | #define FMT4SIZE sizeof_field(struct frame, un.fmt4) |
1da177e4 | 65 | #endif |
0c22fafd GU |
66 | |
67 | static const int frame_size_change[16] = { | |
5f5f2949 GS |
68 | [1] = -1, /* sizeof_field(struct frame, un.fmt1), */ |
69 | [2] = sizeof_field(struct frame, un.fmt2), | |
70 | [3] = sizeof_field(struct frame, un.fmt3), | |
0c22fafd | 71 | [4] = FMT4SIZE, |
5f5f2949 GS |
72 | [5] = -1, /* sizeof_field(struct frame, un.fmt5), */ |
73 | [6] = -1, /* sizeof_field(struct frame, un.fmt6), */ | |
74 | [7] = sizeof_field(struct frame, un.fmt7), | |
75 | [8] = -1, /* sizeof_field(struct frame, un.fmt8), */ | |
76 | [9] = sizeof_field(struct frame, un.fmt9), | |
77 | [10] = sizeof_field(struct frame, un.fmta), | |
78 | [11] = sizeof_field(struct frame, un.fmtb), | |
79 | [12] = -1, /* sizeof_field(struct frame, un.fmtc), */ | |
80 | [13] = -1, /* sizeof_field(struct frame, un.fmtd), */ | |
81 | [14] = -1, /* sizeof_field(struct frame, un.fmte), */ | |
82 | [15] = -1, /* sizeof_field(struct frame, un.fmtf), */ | |
0c22fafd GU |
83 | }; |
84 | ||
85 | static inline int frame_extra_sizes(int f) | |
86 | { | |
87 | return frame_size_change[f]; | |
88 | } | |
89 | ||
68acfdcb | 90 | int fixup_exception(struct pt_regs *regs) |
0c22fafd GU |
91 | { |
92 | const struct exception_table_entry *fixup; | |
93 | struct pt_regs *tregs; | |
94 | ||
95 | /* Are we prepared to handle this kernel fault? */ | |
96 | fixup = search_exception_tables(regs->pc); | |
97 | if (!fixup) | |
98 | return 0; | |
99 | ||
100 | /* Create a new four word stack frame, discarding the old one. */ | |
101 | regs->stkadj = frame_extra_sizes(regs->format); | |
102 | tregs = (struct pt_regs *)((long)regs + regs->stkadj); | |
103 | tregs->vector = regs->vector; | |
104 | tregs->format = FORMAT; | |
105 | tregs->pc = fixup->fixup; | |
106 | tregs->sr = regs->sr; | |
107 | ||
108 | return 1; | |
109 | } | |
110 | ||
0c22fafd GU |
111 | static inline void push_cache (unsigned long vaddr) |
112 | { | |
113 | /* | |
114 | * Using the old cache_push_v() was really a big waste. | |
115 | * | |
116 | * What we are trying to do is to flush 8 bytes to ram. | |
117 | * Flushing 2 cache lines of 16 bytes is much cheaper than | |
118 | * flushing 1 or 2 pages, as previously done in | |
119 | * cache_push_v(). | |
120 | * Jes | |
121 | */ | |
122 | if (CPU_IS_040) { | |
123 | unsigned long temp; | |
124 | ||
125 | __asm__ __volatile__ (".chip 68040\n\t" | |
126 | "nop\n\t" | |
127 | "ptestr (%1)\n\t" | |
128 | "movec %%mmusr,%0\n\t" | |
129 | ".chip 68k" | |
130 | : "=r" (temp) | |
131 | : "a" (vaddr)); | |
132 | ||
133 | temp &= PAGE_MASK; | |
134 | temp |= vaddr & ~PAGE_MASK; | |
135 | ||
136 | __asm__ __volatile__ (".chip 68040\n\t" | |
137 | "nop\n\t" | |
138 | "cpushl %%bc,(%0)\n\t" | |
139 | ".chip 68k" | |
140 | : : "a" (temp)); | |
141 | } | |
142 | else if (CPU_IS_060) { | |
143 | unsigned long temp; | |
144 | __asm__ __volatile__ (".chip 68060\n\t" | |
145 | "plpar (%0)\n\t" | |
146 | ".chip 68k" | |
147 | : "=a" (temp) | |
148 | : "0" (vaddr)); | |
149 | __asm__ __volatile__ (".chip 68060\n\t" | |
150 | "cpushl %%bc,(%0)\n\t" | |
151 | ".chip 68k" | |
152 | : : "a" (temp)); | |
153 | } else if (!CPU_IS_COLDFIRE) { | |
154 | /* | |
155 | * 68030/68020 have no writeback cache; | |
156 | * still need to clear icache. | |
157 | * Note that vaddr is guaranteed to be long word aligned. | |
158 | */ | |
159 | unsigned long temp; | |
160 | asm volatile ("movec %%cacr,%0" : "=r" (temp)); | |
161 | temp += 4; | |
162 | asm volatile ("movec %0,%%caar\n\t" | |
163 | "movec %1,%%cacr" | |
164 | : : "r" (vaddr), "r" (temp)); | |
165 | asm volatile ("movec %0,%%caar\n\t" | |
166 | "movec %1,%%cacr" | |
167 | : : "r" (vaddr + 4), "r" (temp)); | |
42cb38bc AS |
168 | } else { |
169 | /* CPU_IS_COLDFIRE */ | |
170 | #if defined(CONFIG_CACHE_COPYBACK) | |
171 | flush_cf_dcache(0, DCACHE_MAX_ADDR); | |
172 | #endif | |
173 | /* Invalidate instruction cache for the pushed bytes */ | |
174 | clear_cf_icache(vaddr, vaddr + 8); | |
0c22fafd GU |
175 | } |
176 | } | |
177 | ||
178 | static inline void adjustformat(struct pt_regs *regs) | |
179 | { | |
180 | } | |
181 | ||
182 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
183 | { | |
184 | } | |
185 | ||
186 | #else /* CONFIG_MMU */ | |
187 | ||
188 | void ret_from_user_signal(void); | |
189 | void ret_from_user_rt_signal(void); | |
190 | ||
191 | static inline int frame_extra_sizes(int f) | |
192 | { | |
193 | /* No frame size adjustments required on non-MMU CPUs */ | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static inline void adjustformat(struct pt_regs *regs) | |
198 | { | |
0c22fafd GU |
199 | /* |
200 | * set format byte to make stack appear modulo 4, which it will | |
201 | * be when doing the rte | |
202 | */ | |
203 | regs->format = 0x4; | |
204 | } | |
205 | ||
206 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
207 | { | |
208 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; | |
209 | } | |
210 | ||
211 | static inline void push_cache(unsigned long vaddr) | |
212 | { | |
213 | } | |
214 | ||
215 | #endif /* CONFIG_MMU */ | |
216 | ||
0c22fafd GU |
217 | /* |
218 | * Do a signal return; undo the signal stack. | |
219 | * | |
220 | * Keep the return code on the stack quadword aligned! | |
221 | * That makes the cache flush below easier. | |
222 | */ | |
223 | ||
224 | struct sigframe | |
225 | { | |
226 | char __user *pretcode; | |
227 | int sig; | |
228 | int code; | |
229 | struct sigcontext __user *psc; | |
230 | char retcode[8]; | |
231 | unsigned long extramask[_NSIG_WORDS-1]; | |
232 | struct sigcontext sc; | |
233 | }; | |
234 | ||
235 | struct rt_sigframe | |
236 | { | |
237 | char __user *pretcode; | |
238 | int sig; | |
239 | struct siginfo __user *pinfo; | |
240 | void __user *puc; | |
241 | char retcode[8]; | |
242 | struct siginfo info; | |
243 | struct ucontext uc; | |
244 | }; | |
245 | ||
246 | #define FPCONTEXT_SIZE 216 | |
247 | #define uc_fpstate uc_filler[0] | |
248 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] | |
249 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] | |
250 | ||
251 | #ifdef CONFIG_FPU | |
252 | ||
253 | static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ | |
254 | ||
255 | static inline int restore_fpu_state(struct sigcontext *sc) | |
256 | { | |
257 | int err = 1; | |
258 | ||
259 | if (FPU_IS_EMU) { | |
260 | /* restore registers */ | |
261 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); | |
262 | memcpy(current->thread.fp, sc->sc_fpregs, 24); | |
263 | return 0; | |
264 | } | |
265 | ||
266 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
267 | /* Verify the frame format. */ | |
268 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
269 | (sc->sc_fpstate[0] != fpu_version)) | |
270 | goto out; | |
271 | if (CPU_IS_020_OR_030) { | |
272 | if (m68k_fputype & FPU_68881 && | |
273 | !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) | |
274 | goto out; | |
275 | if (m68k_fputype & FPU_68882 && | |
276 | !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) | |
277 | goto out; | |
278 | } else if (CPU_IS_040) { | |
279 | if (!(sc->sc_fpstate[1] == 0x00 || | |
280 | sc->sc_fpstate[1] == 0x28 || | |
281 | sc->sc_fpstate[1] == 0x60)) | |
282 | goto out; | |
283 | } else if (CPU_IS_060) { | |
284 | if (!(sc->sc_fpstate[3] == 0x00 || | |
285 | sc->sc_fpstate[3] == 0x60 || | |
286 | sc->sc_fpstate[3] == 0xe0)) | |
287 | goto out; | |
288 | } else if (CPU_IS_COLDFIRE) { | |
289 | if (!(sc->sc_fpstate[0] == 0x00 || | |
290 | sc->sc_fpstate[0] == 0x05 || | |
291 | sc->sc_fpstate[0] == 0xe5)) | |
292 | goto out; | |
293 | } else | |
294 | goto out; | |
295 | ||
296 | if (CPU_IS_COLDFIRE) { | |
297 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" | |
298 | "fmovel %1,%%fpcr\n\t" | |
299 | "fmovel %2,%%fpsr\n\t" | |
300 | "fmovel %3,%%fpiar" | |
301 | : /* no outputs */ | |
302 | : "m" (sc->sc_fpregs[0]), | |
303 | "m" (sc->sc_fpcntl[0]), | |
304 | "m" (sc->sc_fpcntl[1]), | |
305 | "m" (sc->sc_fpcntl[2])); | |
306 | } else { | |
307 | __asm__ volatile (".chip 68k/68881\n\t" | |
308 | "fmovemx %0,%%fp0-%%fp1\n\t" | |
309 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
310 | ".chip 68k" | |
311 | : /* no outputs */ | |
312 | : "m" (*sc->sc_fpregs), | |
313 | "m" (*sc->sc_fpcntl)); | |
314 | } | |
315 | } | |
316 | ||
317 | if (CPU_IS_COLDFIRE) { | |
318 | __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); | |
319 | } else { | |
320 | __asm__ volatile (".chip 68k/68881\n\t" | |
321 | "frestore %0\n\t" | |
322 | ".chip 68k" | |
323 | : : "m" (*sc->sc_fpstate)); | |
324 | } | |
325 | err = 0; | |
326 | ||
327 | out: | |
328 | return err; | |
329 | } | |
330 | ||
331 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
332 | { | |
333 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
334 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
335 | fpregset_t fpregs; | |
336 | int err = 1; | |
337 | ||
338 | if (FPU_IS_EMU) { | |
339 | /* restore fpu control register */ | |
340 | if (__copy_from_user(current->thread.fpcntl, | |
341 | uc->uc_mcontext.fpregs.f_fpcntl, 12)) | |
342 | goto out; | |
343 | /* restore all other fpu register */ | |
344 | if (__copy_from_user(current->thread.fp, | |
345 | uc->uc_mcontext.fpregs.f_fpregs, 96)) | |
346 | goto out; | |
347 | return 0; | |
348 | } | |
349 | ||
350 | if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) | |
351 | goto out; | |
352 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
353 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
354 | context_size = fpstate[1]; | |
355 | /* Verify the frame format. */ | |
356 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
357 | (fpstate[0] != fpu_version)) | |
358 | goto out; | |
359 | if (CPU_IS_020_OR_030) { | |
360 | if (m68k_fputype & FPU_68881 && | |
361 | !(context_size == 0x18 || context_size == 0xb4)) | |
362 | goto out; | |
363 | if (m68k_fputype & FPU_68882 && | |
364 | !(context_size == 0x38 || context_size == 0xd4)) | |
365 | goto out; | |
366 | } else if (CPU_IS_040) { | |
367 | if (!(context_size == 0x00 || | |
368 | context_size == 0x28 || | |
369 | context_size == 0x60)) | |
370 | goto out; | |
371 | } else if (CPU_IS_060) { | |
372 | if (!(fpstate[3] == 0x00 || | |
373 | fpstate[3] == 0x60 || | |
374 | fpstate[3] == 0xe0)) | |
375 | goto out; | |
376 | } else if (CPU_IS_COLDFIRE) { | |
377 | if (!(fpstate[3] == 0x00 || | |
378 | fpstate[3] == 0x05 || | |
379 | fpstate[3] == 0xe5)) | |
380 | goto out; | |
381 | } else | |
382 | goto out; | |
383 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, | |
384 | sizeof(fpregs))) | |
385 | goto out; | |
386 | ||
387 | if (CPU_IS_COLDFIRE) { | |
388 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" | |
389 | "fmovel %1,%%fpcr\n\t" | |
390 | "fmovel %2,%%fpsr\n\t" | |
391 | "fmovel %3,%%fpiar" | |
392 | : /* no outputs */ | |
393 | : "m" (fpregs.f_fpregs[0]), | |
394 | "m" (fpregs.f_fpcntl[0]), | |
395 | "m" (fpregs.f_fpcntl[1]), | |
396 | "m" (fpregs.f_fpcntl[2])); | |
397 | } else { | |
398 | __asm__ volatile (".chip 68k/68881\n\t" | |
399 | "fmovemx %0,%%fp0-%%fp7\n\t" | |
400 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
401 | ".chip 68k" | |
402 | : /* no outputs */ | |
403 | : "m" (*fpregs.f_fpregs), | |
404 | "m" (*fpregs.f_fpcntl)); | |
405 | } | |
406 | } | |
407 | if (context_size && | |
408 | __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, | |
409 | context_size)) | |
410 | goto out; | |
411 | ||
412 | if (CPU_IS_COLDFIRE) { | |
413 | __asm__ volatile ("frestore %0" : : "m" (*fpstate)); | |
414 | } else { | |
415 | __asm__ volatile (".chip 68k/68881\n\t" | |
416 | "frestore %0\n\t" | |
417 | ".chip 68k" | |
418 | : : "m" (*fpstate)); | |
419 | } | |
420 | err = 0; | |
421 | ||
422 | out: | |
423 | return err; | |
424 | } | |
425 | ||
426 | /* | |
427 | * Set up a signal frame. | |
428 | */ | |
429 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
430 | { | |
431 | if (FPU_IS_EMU) { | |
432 | /* save registers */ | |
433 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); | |
434 | memcpy(sc->sc_fpregs, current->thread.fp, 24); | |
435 | return; | |
436 | } | |
437 | ||
438 | if (CPU_IS_COLDFIRE) { | |
439 | __asm__ volatile ("fsave %0" | |
440 | : : "m" (*sc->sc_fpstate) : "memory"); | |
441 | } else { | |
442 | __asm__ volatile (".chip 68k/68881\n\t" | |
443 | "fsave %0\n\t" | |
444 | ".chip 68k" | |
445 | : : "m" (*sc->sc_fpstate) : "memory"); | |
446 | } | |
447 | ||
448 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
449 | fpu_version = sc->sc_fpstate[0]; | |
4bb0bd81 | 450 | if (CPU_IS_020_OR_030 && !regs->stkadj && |
0c22fafd GU |
451 | regs->vector >= (VEC_FPBRUC * 4) && |
452 | regs->vector <= (VEC_FPNAN * 4)) { | |
453 | /* Clear pending exception in 68882 idle frame */ | |
454 | if (*(unsigned short *) sc->sc_fpstate == 0x1f38) | |
455 | sc->sc_fpstate[0x38] |= 1 << 3; | |
456 | } | |
457 | ||
458 | if (CPU_IS_COLDFIRE) { | |
459 | __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" | |
460 | "fmovel %%fpcr,%1\n\t" | |
461 | "fmovel %%fpsr,%2\n\t" | |
462 | "fmovel %%fpiar,%3" | |
463 | : "=m" (sc->sc_fpregs[0]), | |
464 | "=m" (sc->sc_fpcntl[0]), | |
465 | "=m" (sc->sc_fpcntl[1]), | |
466 | "=m" (sc->sc_fpcntl[2]) | |
467 | : /* no inputs */ | |
468 | : "memory"); | |
469 | } else { | |
470 | __asm__ volatile (".chip 68k/68881\n\t" | |
471 | "fmovemx %%fp0-%%fp1,%0\n\t" | |
472 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
473 | ".chip 68k" | |
474 | : "=m" (*sc->sc_fpregs), | |
475 | "=m" (*sc->sc_fpcntl) | |
476 | : /* no inputs */ | |
477 | : "memory"); | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
482 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
483 | { | |
484 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
485 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
486 | int err = 0; | |
487 | ||
488 | if (FPU_IS_EMU) { | |
489 | /* save fpu control register */ | |
490 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, | |
491 | current->thread.fpcntl, 12); | |
492 | /* save all other fpu register */ | |
493 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, | |
494 | current->thread.fp, 96); | |
495 | return err; | |
496 | } | |
497 | ||
498 | if (CPU_IS_COLDFIRE) { | |
499 | __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); | |
500 | } else { | |
501 | __asm__ volatile (".chip 68k/68881\n\t" | |
502 | "fsave %0\n\t" | |
503 | ".chip 68k" | |
504 | : : "m" (*fpstate) : "memory"); | |
505 | } | |
506 | ||
507 | err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); | |
508 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
509 | fpregset_t fpregs; | |
510 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
511 | context_size = fpstate[1]; | |
512 | fpu_version = fpstate[0]; | |
4bb0bd81 | 513 | if (CPU_IS_020_OR_030 && !regs->stkadj && |
0c22fafd GU |
514 | regs->vector >= (VEC_FPBRUC * 4) && |
515 | regs->vector <= (VEC_FPNAN * 4)) { | |
516 | /* Clear pending exception in 68882 idle frame */ | |
517 | if (*(unsigned short *) fpstate == 0x1f38) | |
518 | fpstate[0x38] |= 1 << 3; | |
519 | } | |
520 | if (CPU_IS_COLDFIRE) { | |
521 | __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" | |
522 | "fmovel %%fpcr,%1\n\t" | |
523 | "fmovel %%fpsr,%2\n\t" | |
524 | "fmovel %%fpiar,%3" | |
525 | : "=m" (fpregs.f_fpregs[0]), | |
526 | "=m" (fpregs.f_fpcntl[0]), | |
527 | "=m" (fpregs.f_fpcntl[1]), | |
528 | "=m" (fpregs.f_fpcntl[2]) | |
529 | : /* no inputs */ | |
530 | : "memory"); | |
531 | } else { | |
532 | __asm__ volatile (".chip 68k/68881\n\t" | |
533 | "fmovemx %%fp0-%%fp7,%0\n\t" | |
534 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
535 | ".chip 68k" | |
536 | : "=m" (*fpregs.f_fpregs), | |
537 | "=m" (*fpregs.f_fpcntl) | |
538 | : /* no inputs */ | |
539 | : "memory"); | |
540 | } | |
541 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, | |
542 | sizeof(fpregs)); | |
543 | } | |
544 | if (context_size) | |
545 | err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, | |
546 | context_size); | |
547 | return err; | |
548 | } | |
549 | ||
550 | #else /* CONFIG_FPU */ | |
551 | ||
552 | /* | |
553 | * For the case with no FPU configured these all do nothing. | |
554 | */ | |
555 | static inline int restore_fpu_state(struct sigcontext *sc) | |
556 | { | |
557 | return 0; | |
558 | } | |
559 | ||
560 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
561 | { | |
562 | return 0; | |
563 | } | |
564 | ||
565 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
566 | { | |
567 | } | |
568 | ||
569 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
570 | { | |
571 | return 0; | |
572 | } | |
573 | ||
574 | #endif /* CONFIG_FPU */ | |
575 | ||
4be33329 EB |
576 | static inline void siginfo_build_tests(void) |
577 | { | |
4eee57d6 GU |
578 | /* |
579 | * This needs to be tested on m68k as it has a lesser | |
580 | * alignment requirement than x86 and that can cause surprises. | |
4be33329 EB |
581 | */ |
582 | ||
583 | /* This is part of the ABI and can never change in size: */ | |
584 | BUILD_BUG_ON(sizeof(siginfo_t) != 128); | |
585 | ||
4eee57d6 | 586 | /* Ensure the known fields never change in location */ |
4be33329 EB |
587 | BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0); |
588 | BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4); | |
589 | BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8); | |
590 | ||
591 | /* _kill */ | |
4eee57d6 | 592 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
593 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
594 | ||
595 | /* _timer */ | |
4eee57d6 | 596 | BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c); |
4be33329 EB |
597 | BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10); |
598 | BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); | |
599 | ||
600 | /* _rt */ | |
4eee57d6 | 601 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
602 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
603 | BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); | |
604 | ||
605 | /* _sigchld */ | |
4eee57d6 | 606 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
607 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
608 | BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14); | |
609 | BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18); | |
4eee57d6 | 610 | BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c); |
4be33329 EB |
611 | |
612 | /* _sigfault */ | |
4eee57d6 | 613 | BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c); |
4be33329 EB |
614 | |
615 | /* _sigfault._mcerr */ | |
616 | BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10); | |
617 | ||
618 | /* _sigfault._addr_bnd */ | |
619 | BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12); | |
620 | BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16); | |
621 | ||
622 | /* _sigfault._addr_pkey */ | |
623 | BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12); | |
624 | ||
fb6cc127 | 625 | /* _sigfault._perf */ |
0683b531 EB |
626 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10); |
627 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14); | |
78ed93d7 | 628 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18); |
fb6cc127 | 629 | |
4be33329 | 630 | /* _sigpoll */ |
4eee57d6 | 631 | BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c); |
4be33329 EB |
632 | BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10); |
633 | ||
634 | /* _sigsys */ | |
4eee57d6 | 635 | BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c); |
4be33329 EB |
636 | BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10); |
637 | BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14); | |
638 | ||
639 | /* any new si_fields should be added here */ | |
640 | } | |
641 | ||
0c22fafd GU |
642 | static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, |
643 | void __user *fp) | |
644 | { | |
0d20abde AV |
645 | int extra = frame_extra_sizes(formatvec >> 12); |
646 | char buf[sizeof_field(struct frame, un)]; | |
647 | ||
648 | if (extra < 0) { | |
0c22fafd GU |
649 | /* |
650 | * user process trying to return with weird frame format | |
651 | */ | |
7c79e1ee | 652 | pr_debug("user process returning with weird frame format\n"); |
0d20abde | 653 | return -1; |
0c22fafd | 654 | } |
0d20abde AV |
655 | if (extra && copy_from_user(buf, fp, extra)) |
656 | return -1; | |
657 | regs->format = formatvec >> 12; | |
658 | regs->vector = formatvec & 0xfff; | |
659 | if (extra) { | |
660 | void *p = (struct switch_stack *)regs - 1; | |
661 | struct frame *new = (void *)regs - extra; | |
662 | int size = sizeof(struct pt_regs)+sizeof(struct switch_stack); | |
663 | ||
664 | memmove(p - extra, p, size); | |
665 | memcpy(p - extra + size, buf, extra); | |
666 | current->thread.esp0 = (unsigned long)&new->ptregs; | |
667 | #ifdef CONFIG_M68040 | |
668 | /* on 68040 complete pending writebacks if any */ | |
669 | if (new->ptregs.format == 7) // bus error frame | |
670 | berr_040cleanup(new); | |
0c22fafd | 671 | #endif |
0c22fafd | 672 | } |
0d20abde | 673 | return extra; |
0c22fafd GU |
674 | } |
675 | ||
676 | static inline int | |
677 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) | |
678 | { | |
679 | int formatvec; | |
680 | struct sigcontext context; | |
0c22fafd | 681 | |
4be33329 EB |
682 | siginfo_build_tests(); |
683 | ||
0c22fafd | 684 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 685 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
686 | |
687 | /* get previous context */ | |
688 | if (copy_from_user(&context, usc, sizeof(context))) | |
0d20abde | 689 | return -1; |
0c22fafd GU |
690 | |
691 | /* restore passed registers */ | |
692 | regs->d0 = context.sc_d0; | |
693 | regs->d1 = context.sc_d1; | |
694 | regs->a0 = context.sc_a0; | |
695 | regs->a1 = context.sc_a1; | |
696 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); | |
697 | regs->pc = context.sc_pc; | |
698 | regs->orig_d0 = -1; /* disable syscall checks */ | |
699 | wrusp(context.sc_usp); | |
700 | formatvec = context.sc_formatvec; | |
701 | ||
0d20abde AV |
702 | if (restore_fpu_state(&context)) |
703 | return -1; | |
0c22fafd | 704 | |
0d20abde | 705 | return mangle_kernel_stack(regs, formatvec, fp); |
0c22fafd GU |
706 | } |
707 | ||
708 | static inline int | |
709 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, | |
710 | struct ucontext __user *uc) | |
711 | { | |
712 | int temp; | |
713 | greg_t __user *gregs = uc->uc_mcontext.gregs; | |
714 | unsigned long usp; | |
715 | int err; | |
716 | ||
717 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 718 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
719 | |
720 | err = __get_user(temp, &uc->uc_mcontext.version); | |
721 | if (temp != MCONTEXT_VERSION) | |
0d20abde | 722 | return -1; |
0c22fafd GU |
723 | /* restore passed registers */ |
724 | err |= __get_user(regs->d0, &gregs[0]); | |
725 | err |= __get_user(regs->d1, &gregs[1]); | |
726 | err |= __get_user(regs->d2, &gregs[2]); | |
727 | err |= __get_user(regs->d3, &gregs[3]); | |
728 | err |= __get_user(regs->d4, &gregs[4]); | |
729 | err |= __get_user(regs->d5, &gregs[5]); | |
730 | err |= __get_user(sw->d6, &gregs[6]); | |
731 | err |= __get_user(sw->d7, &gregs[7]); | |
732 | err |= __get_user(regs->a0, &gregs[8]); | |
733 | err |= __get_user(regs->a1, &gregs[9]); | |
734 | err |= __get_user(regs->a2, &gregs[10]); | |
735 | err |= __get_user(sw->a3, &gregs[11]); | |
736 | err |= __get_user(sw->a4, &gregs[12]); | |
737 | err |= __get_user(sw->a5, &gregs[13]); | |
738 | err |= __get_user(sw->a6, &gregs[14]); | |
739 | err |= __get_user(usp, &gregs[15]); | |
740 | wrusp(usp); | |
741 | err |= __get_user(regs->pc, &gregs[16]); | |
742 | err |= __get_user(temp, &gregs[17]); | |
743 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); | |
744 | regs->orig_d0 = -1; /* disable syscall checks */ | |
745 | err |= __get_user(temp, &uc->uc_formatvec); | |
746 | ||
747 | err |= rt_restore_fpu_state(uc); | |
08d4f653 | 748 | err |= restore_altstack(&uc->uc_stack); |
0c22fafd | 749 | |
08d4f653 | 750 | if (err) |
0d20abde | 751 | return -1; |
0c22fafd | 752 | |
0d20abde | 753 | return mangle_kernel_stack(regs, temp, &uc->uc_extra); |
0c22fafd GU |
754 | } |
755 | ||
0d20abde | 756 | asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 757 | { |
0c22fafd GU |
758 | unsigned long usp = rdusp(); |
759 | struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); | |
760 | sigset_t set; | |
0d20abde | 761 | int size; |
0c22fafd | 762 | |
96d4f267 | 763 | if (!access_ok(frame, sizeof(*frame))) |
0c22fafd GU |
764 | goto badframe; |
765 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || | |
766 | (_NSIG_WORDS > 1 && | |
767 | __copy_from_user(&set.sig[1], &frame->extramask, | |
768 | sizeof(frame->extramask)))) | |
769 | goto badframe; | |
770 | ||
43a35995 | 771 | set_current_blocked(&set); |
0c22fafd | 772 | |
0d20abde AV |
773 | size = restore_sigcontext(regs, &frame->sc, frame + 1); |
774 | if (size < 0) | |
0c22fafd | 775 | goto badframe; |
0d20abde | 776 | return (void *)sw - size; |
0c22fafd GU |
777 | |
778 | badframe: | |
3cf5d076 | 779 | force_sig(SIGSEGV); |
0d20abde | 780 | return sw; |
0c22fafd GU |
781 | } |
782 | ||
0d20abde | 783 | asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 784 | { |
0c22fafd GU |
785 | unsigned long usp = rdusp(); |
786 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); | |
787 | sigset_t set; | |
0d20abde | 788 | int size; |
0c22fafd | 789 | |
96d4f267 | 790 | if (!access_ok(frame, sizeof(*frame))) |
0c22fafd GU |
791 | goto badframe; |
792 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
793 | goto badframe; | |
794 | ||
43a35995 | 795 | set_current_blocked(&set); |
0c22fafd | 796 | |
0d20abde AV |
797 | size = rt_restore_ucontext(regs, sw, &frame->uc); |
798 | if (size < 0) | |
0c22fafd | 799 | goto badframe; |
0d20abde | 800 | return (void *)sw - size; |
0c22fafd GU |
801 | |
802 | badframe: | |
3cf5d076 | 803 | force_sig(SIGSEGV); |
0d20abde | 804 | return sw; |
0c22fafd GU |
805 | } |
806 | ||
4bb0bd81 AV |
807 | static inline struct pt_regs *rte_regs(struct pt_regs *regs) |
808 | { | |
809 | return (void *)regs + regs->stkadj; | |
810 | } | |
811 | ||
0c22fafd GU |
812 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
813 | unsigned long mask) | |
814 | { | |
4bb0bd81 | 815 | struct pt_regs *tregs = rte_regs(regs); |
0c22fafd GU |
816 | sc->sc_mask = mask; |
817 | sc->sc_usp = rdusp(); | |
818 | sc->sc_d0 = regs->d0; | |
819 | sc->sc_d1 = regs->d1; | |
820 | sc->sc_a0 = regs->a0; | |
821 | sc->sc_a1 = regs->a1; | |
4bb0bd81 AV |
822 | sc->sc_sr = tregs->sr; |
823 | sc->sc_pc = tregs->pc; | |
824 | sc->sc_formatvec = tregs->format << 12 | tregs->vector; | |
0c22fafd GU |
825 | save_a5_state(sc, regs); |
826 | save_fpu_state(sc, regs); | |
827 | } | |
828 | ||
829 | static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) | |
830 | { | |
831 | struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
4bb0bd81 | 832 | struct pt_regs *tregs = rte_regs(regs); |
0c22fafd GU |
833 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
834 | int err = 0; | |
835 | ||
836 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); | |
837 | err |= __put_user(regs->d0, &gregs[0]); | |
838 | err |= __put_user(regs->d1, &gregs[1]); | |
839 | err |= __put_user(regs->d2, &gregs[2]); | |
840 | err |= __put_user(regs->d3, &gregs[3]); | |
841 | err |= __put_user(regs->d4, &gregs[4]); | |
842 | err |= __put_user(regs->d5, &gregs[5]); | |
843 | err |= __put_user(sw->d6, &gregs[6]); | |
844 | err |= __put_user(sw->d7, &gregs[7]); | |
845 | err |= __put_user(regs->a0, &gregs[8]); | |
846 | err |= __put_user(regs->a1, &gregs[9]); | |
847 | err |= __put_user(regs->a2, &gregs[10]); | |
848 | err |= __put_user(sw->a3, &gregs[11]); | |
849 | err |= __put_user(sw->a4, &gregs[12]); | |
850 | err |= __put_user(sw->a5, &gregs[13]); | |
851 | err |= __put_user(sw->a6, &gregs[14]); | |
852 | err |= __put_user(rdusp(), &gregs[15]); | |
4bb0bd81 AV |
853 | err |= __put_user(tregs->pc, &gregs[16]); |
854 | err |= __put_user(tregs->sr, &gregs[17]); | |
855 | err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec); | |
0c22fafd GU |
856 | err |= rt_save_fpu_state(uc, regs); |
857 | return err; | |
858 | } | |
859 | ||
860 | static inline void __user * | |
36992f28 | 861 | get_sigframe(struct ksignal *ksig, size_t frame_size) |
0c22fafd | 862 | { |
36992f28 | 863 | unsigned long usp = sigsp(rdusp(), ksig); |
0c22fafd | 864 | |
0c22fafd GU |
865 | return (void __user *)((usp - frame_size) & -8UL); |
866 | } | |
867 | ||
0d97500d RW |
868 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
869 | struct pt_regs *regs) | |
0c22fafd GU |
870 | { |
871 | struct sigframe __user *frame; | |
4bb0bd81 AV |
872 | struct pt_regs *tregs = rte_regs(regs); |
873 | int fsize = frame_extra_sizes(tregs->format); | |
0c22fafd | 874 | struct sigcontext context; |
0d97500d | 875 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
876 | |
877 | if (fsize < 0) { | |
7c79e1ee | 878 | pr_debug("setup_frame: Unknown frame format %#x\n", |
4bb0bd81 | 879 | tregs->format); |
0d97500d | 880 | return -EFAULT; |
0c22fafd GU |
881 | } |
882 | ||
36992f28 | 883 | frame = get_sigframe(ksig, sizeof(*frame) + fsize); |
0c22fafd GU |
884 | |
885 | if (fsize) | |
886 | err |= copy_to_user (frame + 1, regs + 1, fsize); | |
887 | ||
a0075cd1 | 888 | err |= __put_user(sig, &frame->sig); |
0c22fafd | 889 | |
4bb0bd81 | 890 | err |= __put_user(tregs->vector, &frame->code); |
0c22fafd GU |
891 | err |= __put_user(&frame->sc, &frame->psc); |
892 | ||
893 | if (_NSIG_WORDS > 1) | |
894 | err |= copy_to_user(frame->extramask, &set->sig[1], | |
895 | sizeof(frame->extramask)); | |
896 | ||
897 | setup_sigcontext(&context, regs, set->sig[0]); | |
898 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); | |
899 | ||
900 | /* Set up to return from userspace. */ | |
901 | #ifdef CONFIG_MMU | |
902 | err |= __put_user(frame->retcode, &frame->pretcode); | |
903 | /* moveq #,d0; trap #0 */ | |
904 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), | |
905 | (long __user *)(frame->retcode)); | |
906 | #else | |
00696747 GU |
907 | err |= __put_user((long) ret_from_user_signal, |
908 | (long __user *) &frame->pretcode); | |
0c22fafd GU |
909 | #endif |
910 | ||
911 | if (err) | |
0d97500d | 912 | return -EFAULT; |
0c22fafd GU |
913 | |
914 | push_cache ((unsigned long) &frame->retcode); | |
915 | ||
0c22fafd GU |
916 | /* |
917 | * This is subtle; if we build more than one sigframe, all but the | |
918 | * first one will see frame format 0 and have fsize == 0, so we won't | |
919 | * screw stkadj. | |
920 | */ | |
4bb0bd81 | 921 | if (fsize) { |
0c22fafd | 922 | regs->stkadj = fsize; |
4bb0bd81 | 923 | tregs = rte_regs(regs); |
7c79e1ee | 924 | pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
0c22fafd GU |
925 | tregs->vector = 0; |
926 | tregs->format = 0; | |
0c22fafd GU |
927 | tregs->sr = regs->sr; |
928 | } | |
4bb0bd81 AV |
929 | |
930 | /* | |
931 | * Set up registers for signal handler. All the state we are about | |
932 | * to destroy is successfully copied to sigframe. | |
933 | */ | |
934 | wrusp ((unsigned long) frame); | |
935 | tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; | |
936 | adjustformat(regs); | |
937 | ||
0c22fafd | 938 | return 0; |
0c22fafd GU |
939 | } |
940 | ||
0d97500d RW |
941 | static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
942 | struct pt_regs *regs) | |
0c22fafd GU |
943 | { |
944 | struct rt_sigframe __user *frame; | |
4bb0bd81 AV |
945 | struct pt_regs *tregs = rte_regs(regs); |
946 | int fsize = frame_extra_sizes(tregs->format); | |
0d97500d | 947 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
948 | |
949 | if (fsize < 0) { | |
7c79e1ee GU |
950 | pr_debug("setup_frame: Unknown frame format %#x\n", |
951 | regs->format); | |
0d97500d | 952 | return -EFAULT; |
0c22fafd GU |
953 | } |
954 | ||
36992f28 | 955 | frame = get_sigframe(ksig, sizeof(*frame)); |
0c22fafd GU |
956 | |
957 | if (fsize) | |
958 | err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); | |
959 | ||
a0075cd1 | 960 | err |= __put_user(sig, &frame->sig); |
0c22fafd GU |
961 | err |= __put_user(&frame->info, &frame->pinfo); |
962 | err |= __put_user(&frame->uc, &frame->puc); | |
0d97500d | 963 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
0c22fafd GU |
964 | |
965 | /* Create the ucontext. */ | |
966 | err |= __put_user(0, &frame->uc.uc_flags); | |
967 | err |= __put_user(NULL, &frame->uc.uc_link); | |
08d4f653 | 968 | err |= __save_altstack(&frame->uc.uc_stack, rdusp()); |
0c22fafd GU |
969 | err |= rt_setup_ucontext(&frame->uc, regs); |
970 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); | |
971 | ||
972 | /* Set up to return from userspace. */ | |
973 | #ifdef CONFIG_MMU | |
974 | err |= __put_user(frame->retcode, &frame->pretcode); | |
975 | #ifdef __mcoldfire__ | |
976 | /* movel #__NR_rt_sigreturn,d0; trap #0 */ | |
977 | err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); | |
978 | err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), | |
979 | (long __user *)(frame->retcode + 4)); | |
980 | #else | |
981 | /* moveq #,d0; notb d0; trap #0 */ | |
982 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), | |
983 | (long __user *)(frame->retcode + 0)); | |
984 | err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); | |
985 | #endif | |
986 | #else | |
00696747 GU |
987 | err |= __put_user((long) ret_from_user_rt_signal, |
988 | (long __user *) &frame->pretcode); | |
0c22fafd GU |
989 | #endif /* CONFIG_MMU */ |
990 | ||
991 | if (err) | |
0d97500d | 992 | return -EFAULT; |
0c22fafd GU |
993 | |
994 | push_cache ((unsigned long) &frame->retcode); | |
995 | ||
0c22fafd GU |
996 | /* |
997 | * This is subtle; if we build more than one sigframe, all but the | |
998 | * first one will see frame format 0 and have fsize == 0, so we won't | |
999 | * screw stkadj. | |
1000 | */ | |
4bb0bd81 | 1001 | if (fsize) { |
0c22fafd | 1002 | regs->stkadj = fsize; |
4bb0bd81 | 1003 | tregs = rte_regs(regs); |
7c79e1ee | 1004 | pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
0c22fafd GU |
1005 | tregs->vector = 0; |
1006 | tregs->format = 0; | |
0c22fafd GU |
1007 | tregs->sr = regs->sr; |
1008 | } | |
4bb0bd81 AV |
1009 | |
1010 | /* | |
1011 | * Set up registers for signal handler. All the state we are about | |
1012 | * to destroy is successfully copied to sigframe. | |
1013 | */ | |
1014 | wrusp ((unsigned long) frame); | |
1015 | tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; | |
1016 | adjustformat(regs); | |
0c22fafd | 1017 | return 0; |
0c22fafd GU |
1018 | } |
1019 | ||
1020 | static inline void | |
1021 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) | |
1022 | { | |
1023 | switch (regs->d0) { | |
1024 | case -ERESTARTNOHAND: | |
1025 | if (!has_handler) | |
1026 | goto do_restart; | |
1027 | regs->d0 = -EINTR; | |
1028 | break; | |
1029 | ||
1030 | case -ERESTART_RESTARTBLOCK: | |
1031 | if (!has_handler) { | |
1032 | regs->d0 = __NR_restart_syscall; | |
1033 | regs->pc -= 2; | |
1034 | break; | |
1035 | } | |
1036 | regs->d0 = -EINTR; | |
1037 | break; | |
1038 | ||
1039 | case -ERESTARTSYS: | |
1040 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { | |
1041 | regs->d0 = -EINTR; | |
1042 | break; | |
1043 | } | |
df561f66 | 1044 | fallthrough; |
0c22fafd GU |
1045 | case -ERESTARTNOINTR: |
1046 | do_restart: | |
1047 | regs->d0 = regs->orig_d0; | |
1048 | regs->pc -= 2; | |
1049 | break; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * OK, we're invoking a handler | |
1055 | */ | |
1056 | static void | |
0d97500d | 1057 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
0c22fafd | 1058 | { |
b7f9a11a | 1059 | sigset_t *oldset = sigmask_to_save(); |
0c22fafd GU |
1060 | int err; |
1061 | /* are we from a system call? */ | |
1062 | if (regs->orig_d0 >= 0) | |
1063 | /* If so, check system call restarting.. */ | |
0d97500d | 1064 | handle_restart(regs, &ksig->ka, 1); |
0c22fafd GU |
1065 | |
1066 | /* set up the stack frame */ | |
0d97500d RW |
1067 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
1068 | err = setup_rt_frame(ksig, oldset, regs); | |
0c22fafd | 1069 | else |
0d97500d | 1070 | err = setup_frame(ksig, oldset, regs); |
0c22fafd | 1071 | |
0d97500d | 1072 | signal_setup_done(err, ksig, 0); |
0c22fafd GU |
1073 | |
1074 | if (test_thread_flag(TIF_DELAYED_TRACE)) { | |
1075 | regs->sr &= ~0x8000; | |
1076 | send_sig(SIGTRAP, current, 1); | |
1077 | } | |
0c22fafd GU |
1078 | } |
1079 | ||
1080 | /* | |
1081 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1082 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1083 | * mistake. | |
1084 | */ | |
a54f1655 | 1085 | static void do_signal(struct pt_regs *regs) |
0c22fafd | 1086 | { |
0d97500d | 1087 | struct ksignal ksig; |
0c22fafd GU |
1088 | |
1089 | current->thread.esp0 = (unsigned long) regs; | |
1090 | ||
0d97500d | 1091 | if (get_signal(&ksig)) { |
0c22fafd | 1092 | /* Whee! Actually deliver the signal. */ |
0d97500d | 1093 | handle_signal(&ksig, regs); |
0c22fafd GU |
1094 | return; |
1095 | } | |
1096 | ||
1097 | /* Did we come from a system call? */ | |
1098 | if (regs->orig_d0 >= 0) | |
1099 | /* Restart the system call - no handlers present */ | |
1100 | handle_restart(regs, NULL, 0); | |
1101 | ||
1102 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 1103 | restore_saved_sigmask(); |
0c22fafd | 1104 | } |
a54f1655 AV |
1105 | |
1106 | void do_notify_resume(struct pt_regs *regs) | |
1107 | { | |
e660653c JA |
1108 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || |
1109 | test_thread_flag(TIF_SIGPENDING)) | |
a54f1655 AV |
1110 | do_signal(regs); |
1111 | ||
3c532798 | 1112 | if (test_thread_flag(TIF_NOTIFY_RESUME)) |
03248add | 1113 | resume_user_mode_work(regs); |
a54f1655 | 1114 | } |