Commit | Line | Data |
---|---|---|
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 | |
dbe93977 GU |
54 | #include "signal.h" |
55 | ||
66d857b0 | 56 | #ifdef CONFIG_MMU |
0c22fafd GU |
57 | |
58 | /* | |
59 | * Handle the slight differences in classic 68k and ColdFire trap frames. | |
60 | */ | |
61 | #ifdef CONFIG_COLDFIRE | |
62 | #define FORMAT 4 | |
63 | #define FMT4SIZE 0 | |
00ebfe58 | 64 | #else |
0c22fafd | 65 | #define FORMAT 0 |
5f5f2949 | 66 | #define FMT4SIZE sizeof_field(struct frame, un.fmt4) |
1da177e4 | 67 | #endif |
0c22fafd GU |
68 | |
69 | static const int frame_size_change[16] = { | |
5f5f2949 GS |
70 | [1] = -1, /* sizeof_field(struct frame, un.fmt1), */ |
71 | [2] = sizeof_field(struct frame, un.fmt2), | |
72 | [3] = sizeof_field(struct frame, un.fmt3), | |
0c22fafd | 73 | [4] = FMT4SIZE, |
5f5f2949 GS |
74 | [5] = -1, /* sizeof_field(struct frame, un.fmt5), */ |
75 | [6] = -1, /* sizeof_field(struct frame, un.fmt6), */ | |
76 | [7] = sizeof_field(struct frame, un.fmt7), | |
77 | [8] = -1, /* sizeof_field(struct frame, un.fmt8), */ | |
78 | [9] = sizeof_field(struct frame, un.fmt9), | |
79 | [10] = sizeof_field(struct frame, un.fmta), | |
80 | [11] = sizeof_field(struct frame, un.fmtb), | |
81 | [12] = -1, /* sizeof_field(struct frame, un.fmtc), */ | |
82 | [13] = -1, /* sizeof_field(struct frame, un.fmtd), */ | |
83 | [14] = -1, /* sizeof_field(struct frame, un.fmte), */ | |
84 | [15] = -1, /* sizeof_field(struct frame, un.fmtf), */ | |
0c22fafd GU |
85 | }; |
86 | ||
87 | static inline int frame_extra_sizes(int f) | |
88 | { | |
89 | return frame_size_change[f]; | |
90 | } | |
91 | ||
68acfdcb | 92 | int fixup_exception(struct pt_regs *regs) |
0c22fafd GU |
93 | { |
94 | const struct exception_table_entry *fixup; | |
95 | struct pt_regs *tregs; | |
96 | ||
97 | /* Are we prepared to handle this kernel fault? */ | |
98 | fixup = search_exception_tables(regs->pc); | |
99 | if (!fixup) | |
100 | return 0; | |
101 | ||
102 | /* Create a new four word stack frame, discarding the old one. */ | |
103 | regs->stkadj = frame_extra_sizes(regs->format); | |
104 | tregs = (struct pt_regs *)((long)regs + regs->stkadj); | |
105 | tregs->vector = regs->vector; | |
106 | tregs->format = FORMAT; | |
107 | tregs->pc = fixup->fixup; | |
108 | tregs->sr = regs->sr; | |
109 | ||
110 | return 1; | |
111 | } | |
112 | ||
0c22fafd GU |
113 | static inline void push_cache (unsigned long vaddr) |
114 | { | |
115 | /* | |
116 | * Using the old cache_push_v() was really a big waste. | |
117 | * | |
118 | * What we are trying to do is to flush 8 bytes to ram. | |
119 | * Flushing 2 cache lines of 16 bytes is much cheaper than | |
120 | * flushing 1 or 2 pages, as previously done in | |
121 | * cache_push_v(). | |
122 | * Jes | |
123 | */ | |
124 | if (CPU_IS_040) { | |
125 | unsigned long temp; | |
126 | ||
127 | __asm__ __volatile__ (".chip 68040\n\t" | |
128 | "nop\n\t" | |
129 | "ptestr (%1)\n\t" | |
130 | "movec %%mmusr,%0\n\t" | |
131 | ".chip 68k" | |
132 | : "=r" (temp) | |
133 | : "a" (vaddr)); | |
134 | ||
135 | temp &= PAGE_MASK; | |
136 | temp |= vaddr & ~PAGE_MASK; | |
137 | ||
138 | __asm__ __volatile__ (".chip 68040\n\t" | |
139 | "nop\n\t" | |
140 | "cpushl %%bc,(%0)\n\t" | |
141 | ".chip 68k" | |
142 | : : "a" (temp)); | |
143 | } | |
144 | else if (CPU_IS_060) { | |
145 | unsigned long temp; | |
146 | __asm__ __volatile__ (".chip 68060\n\t" | |
147 | "plpar (%0)\n\t" | |
148 | ".chip 68k" | |
149 | : "=a" (temp) | |
150 | : "0" (vaddr)); | |
151 | __asm__ __volatile__ (".chip 68060\n\t" | |
152 | "cpushl %%bc,(%0)\n\t" | |
153 | ".chip 68k" | |
154 | : : "a" (temp)); | |
155 | } else if (!CPU_IS_COLDFIRE) { | |
156 | /* | |
157 | * 68030/68020 have no writeback cache; | |
158 | * still need to clear icache. | |
159 | * Note that vaddr is guaranteed to be long word aligned. | |
160 | */ | |
161 | unsigned long temp; | |
162 | asm volatile ("movec %%cacr,%0" : "=r" (temp)); | |
163 | temp += 4; | |
164 | asm volatile ("movec %0,%%caar\n\t" | |
165 | "movec %1,%%cacr" | |
166 | : : "r" (vaddr), "r" (temp)); | |
167 | asm volatile ("movec %0,%%caar\n\t" | |
168 | "movec %1,%%cacr" | |
169 | : : "r" (vaddr + 4), "r" (temp)); | |
42cb38bc AS |
170 | } else { |
171 | /* CPU_IS_COLDFIRE */ | |
172 | #if defined(CONFIG_CACHE_COPYBACK) | |
173 | flush_cf_dcache(0, DCACHE_MAX_ADDR); | |
174 | #endif | |
175 | /* Invalidate instruction cache for the pushed bytes */ | |
176 | clear_cf_icache(vaddr, vaddr + 8); | |
0c22fafd GU |
177 | } |
178 | } | |
179 | ||
180 | static inline void adjustformat(struct pt_regs *regs) | |
181 | { | |
182 | } | |
183 | ||
184 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
185 | { | |
186 | } | |
187 | ||
188 | #else /* CONFIG_MMU */ | |
189 | ||
190 | void ret_from_user_signal(void); | |
191 | void ret_from_user_rt_signal(void); | |
192 | ||
193 | static inline int frame_extra_sizes(int f) | |
194 | { | |
195 | /* No frame size adjustments required on non-MMU CPUs */ | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static inline void adjustformat(struct pt_regs *regs) | |
200 | { | |
0c22fafd GU |
201 | /* |
202 | * set format byte to make stack appear modulo 4, which it will | |
203 | * be when doing the rte | |
204 | */ | |
205 | regs->format = 0x4; | |
206 | } | |
207 | ||
208 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) | |
209 | { | |
210 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; | |
211 | } | |
212 | ||
213 | static inline void push_cache(unsigned long vaddr) | |
214 | { | |
215 | } | |
216 | ||
217 | #endif /* CONFIG_MMU */ | |
218 | ||
0c22fafd GU |
219 | /* |
220 | * Do a signal return; undo the signal stack. | |
221 | * | |
222 | * Keep the return code on the stack quadword aligned! | |
223 | * That makes the cache flush below easier. | |
224 | */ | |
225 | ||
226 | struct sigframe | |
227 | { | |
228 | char __user *pretcode; | |
229 | int sig; | |
230 | int code; | |
231 | struct sigcontext __user *psc; | |
232 | char retcode[8]; | |
233 | unsigned long extramask[_NSIG_WORDS-1]; | |
234 | struct sigcontext sc; | |
235 | }; | |
236 | ||
237 | struct rt_sigframe | |
238 | { | |
239 | char __user *pretcode; | |
240 | int sig; | |
241 | struct siginfo __user *pinfo; | |
242 | void __user *puc; | |
243 | char retcode[8]; | |
244 | struct siginfo info; | |
245 | struct ucontext uc; | |
246 | }; | |
247 | ||
248 | #define FPCONTEXT_SIZE 216 | |
249 | #define uc_fpstate uc_filler[0] | |
250 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] | |
251 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] | |
252 | ||
253 | #ifdef CONFIG_FPU | |
254 | ||
255 | static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ | |
256 | ||
257 | static inline int restore_fpu_state(struct sigcontext *sc) | |
258 | { | |
259 | int err = 1; | |
260 | ||
261 | if (FPU_IS_EMU) { | |
262 | /* restore registers */ | |
263 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); | |
264 | memcpy(current->thread.fp, sc->sc_fpregs, 24); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
269 | /* Verify the frame format. */ | |
270 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
271 | (sc->sc_fpstate[0] != fpu_version)) | |
272 | goto out; | |
273 | if (CPU_IS_020_OR_030) { | |
274 | if (m68k_fputype & FPU_68881 && | |
275 | !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) | |
276 | goto out; | |
277 | if (m68k_fputype & FPU_68882 && | |
278 | !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) | |
279 | goto out; | |
280 | } else if (CPU_IS_040) { | |
281 | if (!(sc->sc_fpstate[1] == 0x00 || | |
282 | sc->sc_fpstate[1] == 0x28 || | |
283 | sc->sc_fpstate[1] == 0x60)) | |
284 | goto out; | |
285 | } else if (CPU_IS_060) { | |
286 | if (!(sc->sc_fpstate[3] == 0x00 || | |
287 | sc->sc_fpstate[3] == 0x60 || | |
288 | sc->sc_fpstate[3] == 0xe0)) | |
289 | goto out; | |
290 | } else if (CPU_IS_COLDFIRE) { | |
291 | if (!(sc->sc_fpstate[0] == 0x00 || | |
292 | sc->sc_fpstate[0] == 0x05 || | |
293 | sc->sc_fpstate[0] == 0xe5)) | |
294 | goto out; | |
295 | } else | |
296 | goto out; | |
297 | ||
298 | if (CPU_IS_COLDFIRE) { | |
299 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" | |
300 | "fmovel %1,%%fpcr\n\t" | |
301 | "fmovel %2,%%fpsr\n\t" | |
302 | "fmovel %3,%%fpiar" | |
303 | : /* no outputs */ | |
304 | : "m" (sc->sc_fpregs[0]), | |
305 | "m" (sc->sc_fpcntl[0]), | |
306 | "m" (sc->sc_fpcntl[1]), | |
307 | "m" (sc->sc_fpcntl[2])); | |
308 | } else { | |
309 | __asm__ volatile (".chip 68k/68881\n\t" | |
310 | "fmovemx %0,%%fp0-%%fp1\n\t" | |
311 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
312 | ".chip 68k" | |
313 | : /* no outputs */ | |
314 | : "m" (*sc->sc_fpregs), | |
315 | "m" (*sc->sc_fpcntl)); | |
316 | } | |
317 | } | |
318 | ||
319 | if (CPU_IS_COLDFIRE) { | |
320 | __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); | |
321 | } else { | |
322 | __asm__ volatile (".chip 68k/68881\n\t" | |
323 | "frestore %0\n\t" | |
324 | ".chip 68k" | |
325 | : : "m" (*sc->sc_fpstate)); | |
326 | } | |
327 | err = 0; | |
328 | ||
329 | out: | |
330 | return err; | |
331 | } | |
332 | ||
333 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
334 | { | |
335 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
336 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
337 | fpregset_t fpregs; | |
338 | int err = 1; | |
339 | ||
340 | if (FPU_IS_EMU) { | |
341 | /* restore fpu control register */ | |
342 | if (__copy_from_user(current->thread.fpcntl, | |
343 | uc->uc_mcontext.fpregs.f_fpcntl, 12)) | |
344 | goto out; | |
345 | /* restore all other fpu register */ | |
346 | if (__copy_from_user(current->thread.fp, | |
347 | uc->uc_mcontext.fpregs.f_fpregs, 96)) | |
348 | goto out; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) | |
353 | goto out; | |
354 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
355 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
356 | context_size = fpstate[1]; | |
357 | /* Verify the frame format. */ | |
358 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && | |
359 | (fpstate[0] != fpu_version)) | |
360 | goto out; | |
361 | if (CPU_IS_020_OR_030) { | |
362 | if (m68k_fputype & FPU_68881 && | |
363 | !(context_size == 0x18 || context_size == 0xb4)) | |
364 | goto out; | |
365 | if (m68k_fputype & FPU_68882 && | |
366 | !(context_size == 0x38 || context_size == 0xd4)) | |
367 | goto out; | |
368 | } else if (CPU_IS_040) { | |
369 | if (!(context_size == 0x00 || | |
370 | context_size == 0x28 || | |
371 | context_size == 0x60)) | |
372 | goto out; | |
373 | } else if (CPU_IS_060) { | |
374 | if (!(fpstate[3] == 0x00 || | |
375 | fpstate[3] == 0x60 || | |
376 | fpstate[3] == 0xe0)) | |
377 | goto out; | |
378 | } else if (CPU_IS_COLDFIRE) { | |
379 | if (!(fpstate[3] == 0x00 || | |
380 | fpstate[3] == 0x05 || | |
381 | fpstate[3] == 0xe5)) | |
382 | goto out; | |
383 | } else | |
384 | goto out; | |
385 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, | |
386 | sizeof(fpregs))) | |
387 | goto out; | |
388 | ||
389 | if (CPU_IS_COLDFIRE) { | |
390 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" | |
391 | "fmovel %1,%%fpcr\n\t" | |
392 | "fmovel %2,%%fpsr\n\t" | |
393 | "fmovel %3,%%fpiar" | |
394 | : /* no outputs */ | |
395 | : "m" (fpregs.f_fpregs[0]), | |
396 | "m" (fpregs.f_fpcntl[0]), | |
397 | "m" (fpregs.f_fpcntl[1]), | |
398 | "m" (fpregs.f_fpcntl[2])); | |
399 | } else { | |
400 | __asm__ volatile (".chip 68k/68881\n\t" | |
401 | "fmovemx %0,%%fp0-%%fp7\n\t" | |
402 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" | |
403 | ".chip 68k" | |
404 | : /* no outputs */ | |
405 | : "m" (*fpregs.f_fpregs), | |
406 | "m" (*fpregs.f_fpcntl)); | |
407 | } | |
408 | } | |
409 | if (context_size && | |
410 | __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, | |
411 | context_size)) | |
412 | goto out; | |
413 | ||
414 | if (CPU_IS_COLDFIRE) { | |
415 | __asm__ volatile ("frestore %0" : : "m" (*fpstate)); | |
416 | } else { | |
417 | __asm__ volatile (".chip 68k/68881\n\t" | |
418 | "frestore %0\n\t" | |
419 | ".chip 68k" | |
420 | : : "m" (*fpstate)); | |
421 | } | |
422 | err = 0; | |
423 | ||
424 | out: | |
425 | return err; | |
426 | } | |
427 | ||
428 | /* | |
429 | * Set up a signal frame. | |
430 | */ | |
431 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
432 | { | |
433 | if (FPU_IS_EMU) { | |
434 | /* save registers */ | |
435 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); | |
436 | memcpy(sc->sc_fpregs, current->thread.fp, 24); | |
437 | return; | |
438 | } | |
439 | ||
440 | if (CPU_IS_COLDFIRE) { | |
441 | __asm__ volatile ("fsave %0" | |
442 | : : "m" (*sc->sc_fpstate) : "memory"); | |
443 | } else { | |
444 | __asm__ volatile (".chip 68k/68881\n\t" | |
445 | "fsave %0\n\t" | |
446 | ".chip 68k" | |
447 | : : "m" (*sc->sc_fpstate) : "memory"); | |
448 | } | |
449 | ||
450 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { | |
451 | fpu_version = sc->sc_fpstate[0]; | |
4bb0bd81 | 452 | if (CPU_IS_020_OR_030 && !regs->stkadj && |
0c22fafd GU |
453 | regs->vector >= (VEC_FPBRUC * 4) && |
454 | regs->vector <= (VEC_FPNAN * 4)) { | |
455 | /* Clear pending exception in 68882 idle frame */ | |
456 | if (*(unsigned short *) sc->sc_fpstate == 0x1f38) | |
457 | sc->sc_fpstate[0x38] |= 1 << 3; | |
458 | } | |
459 | ||
460 | if (CPU_IS_COLDFIRE) { | |
461 | __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" | |
462 | "fmovel %%fpcr,%1\n\t" | |
463 | "fmovel %%fpsr,%2\n\t" | |
464 | "fmovel %%fpiar,%3" | |
465 | : "=m" (sc->sc_fpregs[0]), | |
466 | "=m" (sc->sc_fpcntl[0]), | |
467 | "=m" (sc->sc_fpcntl[1]), | |
468 | "=m" (sc->sc_fpcntl[2]) | |
469 | : /* no inputs */ | |
470 | : "memory"); | |
471 | } else { | |
472 | __asm__ volatile (".chip 68k/68881\n\t" | |
473 | "fmovemx %%fp0-%%fp1,%0\n\t" | |
474 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
475 | ".chip 68k" | |
476 | : "=m" (*sc->sc_fpregs), | |
477 | "=m" (*sc->sc_fpcntl) | |
478 | : /* no inputs */ | |
479 | : "memory"); | |
480 | } | |
481 | } | |
482 | } | |
483 | ||
484 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
485 | { | |
486 | unsigned char fpstate[FPCONTEXT_SIZE]; | |
487 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); | |
488 | int err = 0; | |
489 | ||
490 | if (FPU_IS_EMU) { | |
491 | /* save fpu control register */ | |
492 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, | |
493 | current->thread.fpcntl, 12); | |
494 | /* save all other fpu register */ | |
495 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, | |
496 | current->thread.fp, 96); | |
497 | return err; | |
498 | } | |
499 | ||
500 | if (CPU_IS_COLDFIRE) { | |
501 | __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); | |
502 | } else { | |
503 | __asm__ volatile (".chip 68k/68881\n\t" | |
504 | "fsave %0\n\t" | |
505 | ".chip 68k" | |
506 | : : "m" (*fpstate) : "memory"); | |
507 | } | |
508 | ||
509 | err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); | |
510 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { | |
511 | fpregset_t fpregs; | |
512 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) | |
513 | context_size = fpstate[1]; | |
514 | fpu_version = fpstate[0]; | |
4bb0bd81 | 515 | if (CPU_IS_020_OR_030 && !regs->stkadj && |
0c22fafd GU |
516 | regs->vector >= (VEC_FPBRUC * 4) && |
517 | regs->vector <= (VEC_FPNAN * 4)) { | |
518 | /* Clear pending exception in 68882 idle frame */ | |
519 | if (*(unsigned short *) fpstate == 0x1f38) | |
520 | fpstate[0x38] |= 1 << 3; | |
521 | } | |
522 | if (CPU_IS_COLDFIRE) { | |
523 | __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" | |
524 | "fmovel %%fpcr,%1\n\t" | |
525 | "fmovel %%fpsr,%2\n\t" | |
526 | "fmovel %%fpiar,%3" | |
527 | : "=m" (fpregs.f_fpregs[0]), | |
528 | "=m" (fpregs.f_fpcntl[0]), | |
529 | "=m" (fpregs.f_fpcntl[1]), | |
530 | "=m" (fpregs.f_fpcntl[2]) | |
531 | : /* no inputs */ | |
532 | : "memory"); | |
533 | } else { | |
534 | __asm__ volatile (".chip 68k/68881\n\t" | |
535 | "fmovemx %%fp0-%%fp7,%0\n\t" | |
536 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" | |
537 | ".chip 68k" | |
538 | : "=m" (*fpregs.f_fpregs), | |
539 | "=m" (*fpregs.f_fpcntl) | |
540 | : /* no inputs */ | |
541 | : "memory"); | |
542 | } | |
543 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, | |
544 | sizeof(fpregs)); | |
545 | } | |
546 | if (context_size) | |
547 | err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, | |
548 | context_size); | |
549 | return err; | |
550 | } | |
551 | ||
552 | #else /* CONFIG_FPU */ | |
553 | ||
554 | /* | |
555 | * For the case with no FPU configured these all do nothing. | |
556 | */ | |
557 | static inline int restore_fpu_state(struct sigcontext *sc) | |
558 | { | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) | |
563 | { | |
564 | return 0; | |
565 | } | |
566 | ||
567 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) | |
568 | { | |
569 | } | |
570 | ||
571 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) | |
572 | { | |
573 | return 0; | |
574 | } | |
575 | ||
576 | #endif /* CONFIG_FPU */ | |
577 | ||
4be33329 EB |
578 | static inline void siginfo_build_tests(void) |
579 | { | |
4eee57d6 GU |
580 | /* |
581 | * This needs to be tested on m68k as it has a lesser | |
582 | * alignment requirement than x86 and that can cause surprises. | |
4be33329 EB |
583 | */ |
584 | ||
585 | /* This is part of the ABI and can never change in size: */ | |
586 | BUILD_BUG_ON(sizeof(siginfo_t) != 128); | |
587 | ||
4eee57d6 | 588 | /* Ensure the known fields never change in location */ |
4be33329 EB |
589 | BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0); |
590 | BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4); | |
591 | BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8); | |
592 | ||
593 | /* _kill */ | |
4eee57d6 | 594 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
595 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
596 | ||
597 | /* _timer */ | |
4eee57d6 | 598 | BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c); |
4be33329 EB |
599 | BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10); |
600 | BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); | |
601 | ||
602 | /* _rt */ | |
4eee57d6 | 603 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
604 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
605 | BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); | |
606 | ||
607 | /* _sigchld */ | |
4eee57d6 | 608 | BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); |
4be33329 EB |
609 | BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); |
610 | BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14); | |
611 | BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18); | |
4eee57d6 | 612 | BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c); |
4be33329 EB |
613 | |
614 | /* _sigfault */ | |
4eee57d6 | 615 | BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c); |
4be33329 EB |
616 | |
617 | /* _sigfault._mcerr */ | |
618 | BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10); | |
619 | ||
620 | /* _sigfault._addr_bnd */ | |
621 | BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12); | |
622 | BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16); | |
623 | ||
624 | /* _sigfault._addr_pkey */ | |
625 | BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12); | |
626 | ||
fb6cc127 | 627 | /* _sigfault._perf */ |
0683b531 EB |
628 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10); |
629 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14); | |
78ed93d7 | 630 | BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18); |
fb6cc127 | 631 | |
4be33329 | 632 | /* _sigpoll */ |
4eee57d6 | 633 | BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c); |
4be33329 EB |
634 | BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10); |
635 | ||
636 | /* _sigsys */ | |
4eee57d6 | 637 | BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c); |
4be33329 EB |
638 | BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10); |
639 | BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14); | |
640 | ||
641 | /* any new si_fields should be added here */ | |
642 | } | |
643 | ||
0c22fafd GU |
644 | static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, |
645 | void __user *fp) | |
646 | { | |
0d20abde AV |
647 | int extra = frame_extra_sizes(formatvec >> 12); |
648 | char buf[sizeof_field(struct frame, un)]; | |
649 | ||
650 | if (extra < 0) { | |
0c22fafd GU |
651 | /* |
652 | * user process trying to return with weird frame format | |
653 | */ | |
7c79e1ee | 654 | pr_debug("user process returning with weird frame format\n"); |
0d20abde | 655 | return -1; |
0c22fafd | 656 | } |
0d20abde AV |
657 | if (extra && copy_from_user(buf, fp, extra)) |
658 | return -1; | |
659 | regs->format = formatvec >> 12; | |
660 | regs->vector = formatvec & 0xfff; | |
661 | if (extra) { | |
662 | void *p = (struct switch_stack *)regs - 1; | |
663 | struct frame *new = (void *)regs - extra; | |
664 | int size = sizeof(struct pt_regs)+sizeof(struct switch_stack); | |
665 | ||
666 | memmove(p - extra, p, size); | |
667 | memcpy(p - extra + size, buf, extra); | |
668 | current->thread.esp0 = (unsigned long)&new->ptregs; | |
669 | #ifdef CONFIG_M68040 | |
670 | /* on 68040 complete pending writebacks if any */ | |
671 | if (new->ptregs.format == 7) // bus error frame | |
672 | berr_040cleanup(new); | |
0c22fafd | 673 | #endif |
0c22fafd | 674 | } |
0d20abde | 675 | return extra; |
0c22fafd GU |
676 | } |
677 | ||
678 | static inline int | |
679 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) | |
680 | { | |
681 | int formatvec; | |
682 | struct sigcontext context; | |
0c22fafd | 683 | |
4be33329 EB |
684 | siginfo_build_tests(); |
685 | ||
0c22fafd | 686 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 687 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
688 | |
689 | /* get previous context */ | |
690 | if (copy_from_user(&context, usc, sizeof(context))) | |
0d20abde | 691 | return -1; |
0c22fafd GU |
692 | |
693 | /* restore passed registers */ | |
694 | regs->d0 = context.sc_d0; | |
695 | regs->d1 = context.sc_d1; | |
696 | regs->a0 = context.sc_a0; | |
697 | regs->a1 = context.sc_a1; | |
698 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); | |
699 | regs->pc = context.sc_pc; | |
700 | regs->orig_d0 = -1; /* disable syscall checks */ | |
701 | wrusp(context.sc_usp); | |
702 | formatvec = context.sc_formatvec; | |
703 | ||
0d20abde AV |
704 | if (restore_fpu_state(&context)) |
705 | return -1; | |
0c22fafd | 706 | |
0d20abde | 707 | return mangle_kernel_stack(regs, formatvec, fp); |
0c22fafd GU |
708 | } |
709 | ||
710 | static inline int | |
711 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, | |
712 | struct ucontext __user *uc) | |
713 | { | |
714 | int temp; | |
715 | greg_t __user *gregs = uc->uc_mcontext.gregs; | |
716 | unsigned long usp; | |
717 | int err; | |
718 | ||
719 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 720 | current->restart_block.fn = do_no_restart_syscall; |
0c22fafd GU |
721 | |
722 | err = __get_user(temp, &uc->uc_mcontext.version); | |
723 | if (temp != MCONTEXT_VERSION) | |
0d20abde | 724 | return -1; |
0c22fafd GU |
725 | /* restore passed registers */ |
726 | err |= __get_user(regs->d0, &gregs[0]); | |
727 | err |= __get_user(regs->d1, &gregs[1]); | |
728 | err |= __get_user(regs->d2, &gregs[2]); | |
729 | err |= __get_user(regs->d3, &gregs[3]); | |
730 | err |= __get_user(regs->d4, &gregs[4]); | |
731 | err |= __get_user(regs->d5, &gregs[5]); | |
732 | err |= __get_user(sw->d6, &gregs[6]); | |
733 | err |= __get_user(sw->d7, &gregs[7]); | |
734 | err |= __get_user(regs->a0, &gregs[8]); | |
735 | err |= __get_user(regs->a1, &gregs[9]); | |
736 | err |= __get_user(regs->a2, &gregs[10]); | |
737 | err |= __get_user(sw->a3, &gregs[11]); | |
738 | err |= __get_user(sw->a4, &gregs[12]); | |
739 | err |= __get_user(sw->a5, &gregs[13]); | |
740 | err |= __get_user(sw->a6, &gregs[14]); | |
741 | err |= __get_user(usp, &gregs[15]); | |
742 | wrusp(usp); | |
743 | err |= __get_user(regs->pc, &gregs[16]); | |
744 | err |= __get_user(temp, &gregs[17]); | |
745 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); | |
746 | regs->orig_d0 = -1; /* disable syscall checks */ | |
747 | err |= __get_user(temp, &uc->uc_formatvec); | |
748 | ||
749 | err |= rt_restore_fpu_state(uc); | |
08d4f653 | 750 | err |= restore_altstack(&uc->uc_stack); |
0c22fafd | 751 | |
08d4f653 | 752 | if (err) |
0d20abde | 753 | return -1; |
0c22fafd | 754 | |
0d20abde | 755 | return mangle_kernel_stack(regs, temp, &uc->uc_extra); |
0c22fafd GU |
756 | } |
757 | ||
0d20abde | 758 | asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 759 | { |
0c22fafd GU |
760 | unsigned long usp = rdusp(); |
761 | struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); | |
762 | sigset_t set; | |
0d20abde | 763 | int size; |
0c22fafd | 764 | |
96d4f267 | 765 | if (!access_ok(frame, sizeof(*frame))) |
0c22fafd GU |
766 | goto badframe; |
767 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || | |
768 | (_NSIG_WORDS > 1 && | |
769 | __copy_from_user(&set.sig[1], &frame->extramask, | |
770 | sizeof(frame->extramask)))) | |
771 | goto badframe; | |
772 | ||
43a35995 | 773 | set_current_blocked(&set); |
0c22fafd | 774 | |
0d20abde AV |
775 | size = restore_sigcontext(regs, &frame->sc, frame + 1); |
776 | if (size < 0) | |
0c22fafd | 777 | goto badframe; |
0d20abde | 778 | return (void *)sw - size; |
0c22fafd GU |
779 | |
780 | badframe: | |
3cf5d076 | 781 | force_sig(SIGSEGV); |
0d20abde | 782 | return sw; |
0c22fafd GU |
783 | } |
784 | ||
0d20abde | 785 | asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw) |
0c22fafd | 786 | { |
0c22fafd GU |
787 | unsigned long usp = rdusp(); |
788 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); | |
789 | sigset_t set; | |
0d20abde | 790 | int size; |
0c22fafd | 791 | |
96d4f267 | 792 | if (!access_ok(frame, sizeof(*frame))) |
0c22fafd GU |
793 | goto badframe; |
794 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
795 | goto badframe; | |
796 | ||
43a35995 | 797 | set_current_blocked(&set); |
0c22fafd | 798 | |
0d20abde AV |
799 | size = rt_restore_ucontext(regs, sw, &frame->uc); |
800 | if (size < 0) | |
0c22fafd | 801 | goto badframe; |
0d20abde | 802 | return (void *)sw - size; |
0c22fafd GU |
803 | |
804 | badframe: | |
3cf5d076 | 805 | force_sig(SIGSEGV); |
0d20abde | 806 | return sw; |
0c22fafd GU |
807 | } |
808 | ||
4bb0bd81 AV |
809 | static inline struct pt_regs *rte_regs(struct pt_regs *regs) |
810 | { | |
811 | return (void *)regs + regs->stkadj; | |
812 | } | |
813 | ||
0c22fafd GU |
814 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
815 | unsigned long mask) | |
816 | { | |
4bb0bd81 | 817 | struct pt_regs *tregs = rte_regs(regs); |
0c22fafd GU |
818 | sc->sc_mask = mask; |
819 | sc->sc_usp = rdusp(); | |
820 | sc->sc_d0 = regs->d0; | |
821 | sc->sc_d1 = regs->d1; | |
822 | sc->sc_a0 = regs->a0; | |
823 | sc->sc_a1 = regs->a1; | |
4bb0bd81 AV |
824 | sc->sc_sr = tregs->sr; |
825 | sc->sc_pc = tregs->pc; | |
826 | sc->sc_formatvec = tregs->format << 12 | tregs->vector; | |
0c22fafd GU |
827 | save_a5_state(sc, regs); |
828 | save_fpu_state(sc, regs); | |
829 | } | |
830 | ||
831 | static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) | |
832 | { | |
833 | struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
4bb0bd81 | 834 | struct pt_regs *tregs = rte_regs(regs); |
0c22fafd GU |
835 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
836 | int err = 0; | |
837 | ||
838 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); | |
839 | err |= __put_user(regs->d0, &gregs[0]); | |
840 | err |= __put_user(regs->d1, &gregs[1]); | |
841 | err |= __put_user(regs->d2, &gregs[2]); | |
842 | err |= __put_user(regs->d3, &gregs[3]); | |
843 | err |= __put_user(regs->d4, &gregs[4]); | |
844 | err |= __put_user(regs->d5, &gregs[5]); | |
845 | err |= __put_user(sw->d6, &gregs[6]); | |
846 | err |= __put_user(sw->d7, &gregs[7]); | |
847 | err |= __put_user(regs->a0, &gregs[8]); | |
848 | err |= __put_user(regs->a1, &gregs[9]); | |
849 | err |= __put_user(regs->a2, &gregs[10]); | |
850 | err |= __put_user(sw->a3, &gregs[11]); | |
851 | err |= __put_user(sw->a4, &gregs[12]); | |
852 | err |= __put_user(sw->a5, &gregs[13]); | |
853 | err |= __put_user(sw->a6, &gregs[14]); | |
854 | err |= __put_user(rdusp(), &gregs[15]); | |
4bb0bd81 AV |
855 | err |= __put_user(tregs->pc, &gregs[16]); |
856 | err |= __put_user(tregs->sr, &gregs[17]); | |
857 | err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec); | |
0c22fafd GU |
858 | err |= rt_save_fpu_state(uc, regs); |
859 | return err; | |
860 | } | |
861 | ||
862 | static inline void __user * | |
b845b574 | 863 | get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size) |
0c22fafd | 864 | { |
36992f28 | 865 | unsigned long usp = sigsp(rdusp(), ksig); |
b845b574 | 866 | unsigned long gap = 0; |
0c22fafd | 867 | |
b845b574 FT |
868 | if (CPU_IS_020_OR_030 && tregs->format == 0xb) { |
869 | /* USP is unreliable so use worst-case value */ | |
870 | gap = 256; | |
871 | } | |
872 | ||
873 | return (void __user *)((usp - gap - frame_size) & -8UL); | |
0c22fafd GU |
874 | } |
875 | ||
0d97500d RW |
876 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
877 | struct pt_regs *regs) | |
0c22fafd GU |
878 | { |
879 | struct sigframe __user *frame; | |
4bb0bd81 AV |
880 | struct pt_regs *tregs = rte_regs(regs); |
881 | int fsize = frame_extra_sizes(tregs->format); | |
0c22fafd | 882 | struct sigcontext context; |
0d97500d | 883 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
884 | |
885 | if (fsize < 0) { | |
7c79e1ee | 886 | pr_debug("setup_frame: Unknown frame format %#x\n", |
4bb0bd81 | 887 | tregs->format); |
0d97500d | 888 | return -EFAULT; |
0c22fafd GU |
889 | } |
890 | ||
b845b574 | 891 | frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize); |
0c22fafd GU |
892 | |
893 | if (fsize) | |
894 | err |= copy_to_user (frame + 1, regs + 1, fsize); | |
895 | ||
a0075cd1 | 896 | err |= __put_user(sig, &frame->sig); |
0c22fafd | 897 | |
4bb0bd81 | 898 | err |= __put_user(tregs->vector, &frame->code); |
0c22fafd GU |
899 | err |= __put_user(&frame->sc, &frame->psc); |
900 | ||
901 | if (_NSIG_WORDS > 1) | |
902 | err |= copy_to_user(frame->extramask, &set->sig[1], | |
903 | sizeof(frame->extramask)); | |
904 | ||
905 | setup_sigcontext(&context, regs, set->sig[0]); | |
906 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); | |
907 | ||
908 | /* Set up to return from userspace. */ | |
909 | #ifdef CONFIG_MMU | |
910 | err |= __put_user(frame->retcode, &frame->pretcode); | |
911 | /* moveq #,d0; trap #0 */ | |
912 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), | |
913 | (long __user *)(frame->retcode)); | |
914 | #else | |
00696747 GU |
915 | err |= __put_user((long) ret_from_user_signal, |
916 | (long __user *) &frame->pretcode); | |
0c22fafd GU |
917 | #endif |
918 | ||
919 | if (err) | |
0d97500d | 920 | return -EFAULT; |
0c22fafd GU |
921 | |
922 | push_cache ((unsigned long) &frame->retcode); | |
923 | ||
0c22fafd GU |
924 | /* |
925 | * This is subtle; if we build more than one sigframe, all but the | |
926 | * first one will see frame format 0 and have fsize == 0, so we won't | |
927 | * screw stkadj. | |
928 | */ | |
4bb0bd81 | 929 | if (fsize) { |
0c22fafd | 930 | regs->stkadj = fsize; |
4bb0bd81 | 931 | tregs = rte_regs(regs); |
7c79e1ee | 932 | pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
0c22fafd GU |
933 | tregs->vector = 0; |
934 | tregs->format = 0; | |
0c22fafd GU |
935 | tregs->sr = regs->sr; |
936 | } | |
4bb0bd81 AV |
937 | |
938 | /* | |
939 | * Set up registers for signal handler. All the state we are about | |
940 | * to destroy is successfully copied to sigframe. | |
941 | */ | |
942 | wrusp ((unsigned long) frame); | |
943 | tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; | |
944 | adjustformat(regs); | |
945 | ||
0c22fafd | 946 | return 0; |
0c22fafd GU |
947 | } |
948 | ||
0d97500d RW |
949 | static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
950 | struct pt_regs *regs) | |
0c22fafd GU |
951 | { |
952 | struct rt_sigframe __user *frame; | |
4bb0bd81 AV |
953 | struct pt_regs *tregs = rte_regs(regs); |
954 | int fsize = frame_extra_sizes(tregs->format); | |
0d97500d | 955 | int err = 0, sig = ksig->sig; |
0c22fafd GU |
956 | |
957 | if (fsize < 0) { | |
7c79e1ee GU |
958 | pr_debug("setup_frame: Unknown frame format %#x\n", |
959 | regs->format); | |
0d97500d | 960 | return -EFAULT; |
0c22fafd GU |
961 | } |
962 | ||
b845b574 | 963 | frame = get_sigframe(ksig, tregs, sizeof(*frame)); |
0c22fafd GU |
964 | |
965 | if (fsize) | |
966 | err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); | |
967 | ||
a0075cd1 | 968 | err |= __put_user(sig, &frame->sig); |
0c22fafd GU |
969 | err |= __put_user(&frame->info, &frame->pinfo); |
970 | err |= __put_user(&frame->uc, &frame->puc); | |
0d97500d | 971 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
0c22fafd GU |
972 | |
973 | /* Create the ucontext. */ | |
974 | err |= __put_user(0, &frame->uc.uc_flags); | |
975 | err |= __put_user(NULL, &frame->uc.uc_link); | |
08d4f653 | 976 | err |= __save_altstack(&frame->uc.uc_stack, rdusp()); |
0c22fafd GU |
977 | err |= rt_setup_ucontext(&frame->uc, regs); |
978 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); | |
979 | ||
980 | /* Set up to return from userspace. */ | |
981 | #ifdef CONFIG_MMU | |
982 | err |= __put_user(frame->retcode, &frame->pretcode); | |
983 | #ifdef __mcoldfire__ | |
984 | /* movel #__NR_rt_sigreturn,d0; trap #0 */ | |
985 | err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); | |
986 | err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), | |
987 | (long __user *)(frame->retcode + 4)); | |
988 | #else | |
989 | /* moveq #,d0; notb d0; trap #0 */ | |
990 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), | |
991 | (long __user *)(frame->retcode + 0)); | |
992 | err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); | |
993 | #endif | |
994 | #else | |
00696747 GU |
995 | err |= __put_user((long) ret_from_user_rt_signal, |
996 | (long __user *) &frame->pretcode); | |
0c22fafd GU |
997 | #endif /* CONFIG_MMU */ |
998 | ||
999 | if (err) | |
0d97500d | 1000 | return -EFAULT; |
0c22fafd GU |
1001 | |
1002 | push_cache ((unsigned long) &frame->retcode); | |
1003 | ||
0c22fafd GU |
1004 | /* |
1005 | * This is subtle; if we build more than one sigframe, all but the | |
1006 | * first one will see frame format 0 and have fsize == 0, so we won't | |
1007 | * screw stkadj. | |
1008 | */ | |
4bb0bd81 | 1009 | if (fsize) { |
0c22fafd | 1010 | regs->stkadj = fsize; |
4bb0bd81 | 1011 | tregs = rte_regs(regs); |
7c79e1ee | 1012 | pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); |
0c22fafd GU |
1013 | tregs->vector = 0; |
1014 | tregs->format = 0; | |
0c22fafd GU |
1015 | tregs->sr = regs->sr; |
1016 | } | |
4bb0bd81 AV |
1017 | |
1018 | /* | |
1019 | * Set up registers for signal handler. All the state we are about | |
1020 | * to destroy is successfully copied to sigframe. | |
1021 | */ | |
1022 | wrusp ((unsigned long) frame); | |
1023 | tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; | |
1024 | adjustformat(regs); | |
0c22fafd | 1025 | return 0; |
0c22fafd GU |
1026 | } |
1027 | ||
1028 | static inline void | |
1029 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) | |
1030 | { | |
1031 | switch (regs->d0) { | |
1032 | case -ERESTARTNOHAND: | |
1033 | if (!has_handler) | |
1034 | goto do_restart; | |
1035 | regs->d0 = -EINTR; | |
1036 | break; | |
1037 | ||
1038 | case -ERESTART_RESTARTBLOCK: | |
1039 | if (!has_handler) { | |
1040 | regs->d0 = __NR_restart_syscall; | |
1041 | regs->pc -= 2; | |
1042 | break; | |
1043 | } | |
1044 | regs->d0 = -EINTR; | |
1045 | break; | |
1046 | ||
1047 | case -ERESTARTSYS: | |
1048 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { | |
1049 | regs->d0 = -EINTR; | |
1050 | break; | |
1051 | } | |
df561f66 | 1052 | fallthrough; |
0c22fafd GU |
1053 | case -ERESTARTNOINTR: |
1054 | do_restart: | |
1055 | regs->d0 = regs->orig_d0; | |
1056 | regs->pc -= 2; | |
1057 | break; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * OK, we're invoking a handler | |
1063 | */ | |
1064 | static void | |
0d97500d | 1065 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
0c22fafd | 1066 | { |
b7f9a11a | 1067 | sigset_t *oldset = sigmask_to_save(); |
0c22fafd GU |
1068 | int err; |
1069 | /* are we from a system call? */ | |
1070 | if (regs->orig_d0 >= 0) | |
1071 | /* If so, check system call restarting.. */ | |
0d97500d | 1072 | handle_restart(regs, &ksig->ka, 1); |
0c22fafd GU |
1073 | |
1074 | /* set up the stack frame */ | |
0d97500d RW |
1075 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
1076 | err = setup_rt_frame(ksig, oldset, regs); | |
0c22fafd | 1077 | else |
0d97500d | 1078 | err = setup_frame(ksig, oldset, regs); |
0c22fafd | 1079 | |
0d97500d | 1080 | signal_setup_done(err, ksig, 0); |
0c22fafd GU |
1081 | |
1082 | if (test_thread_flag(TIF_DELAYED_TRACE)) { | |
1083 | regs->sr &= ~0x8000; | |
1084 | send_sig(SIGTRAP, current, 1); | |
1085 | } | |
0c22fafd GU |
1086 | } |
1087 | ||
1088 | /* | |
1089 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1090 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1091 | * mistake. | |
1092 | */ | |
a54f1655 | 1093 | static void do_signal(struct pt_regs *regs) |
0c22fafd | 1094 | { |
0d97500d | 1095 | struct ksignal ksig; |
0c22fafd GU |
1096 | |
1097 | current->thread.esp0 = (unsigned long) regs; | |
1098 | ||
0d97500d | 1099 | if (get_signal(&ksig)) { |
0c22fafd | 1100 | /* Whee! Actually deliver the signal. */ |
0d97500d | 1101 | handle_signal(&ksig, regs); |
0c22fafd GU |
1102 | return; |
1103 | } | |
1104 | ||
1105 | /* Did we come from a system call? */ | |
1106 | if (regs->orig_d0 >= 0) | |
1107 | /* Restart the system call - no handlers present */ | |
1108 | handle_restart(regs, NULL, 0); | |
1109 | ||
1110 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 1111 | restore_saved_sigmask(); |
0c22fafd | 1112 | } |
a54f1655 | 1113 | |
7b9f6ca7 | 1114 | asmlinkage void do_notify_resume(struct pt_regs *regs) |
a54f1655 | 1115 | { |
e660653c JA |
1116 | if (test_thread_flag(TIF_NOTIFY_SIGNAL) || |
1117 | test_thread_flag(TIF_SIGPENDING)) | |
a54f1655 AV |
1118 | do_signal(regs); |
1119 | ||
3c532798 | 1120 | if (test_thread_flag(TIF_NOTIFY_RESUME)) |
03248add | 1121 | resume_user_mode_work(regs); |
a54f1655 | 1122 | } |