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1da177e4 LT |
1 | /* |
2 | * signal32.c: Support 32bit signal syscalls. | |
3 | * | |
4 | * Copyright (C) 2001 IBM | |
5 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
6 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) | |
7 | * | |
8 | * These routines maintain argument size conversion between 32bit and 64bit | |
9 | * environment. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/config.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/signal.h> | |
24 | #include <linux/syscalls.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/elf.h> | |
27 | #include <linux/compat.h> | |
28 | #include <linux/ptrace.h> | |
29 | #include <asm/ppc32.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/ppcdebug.h> | |
32 | #include <asm/unistd.h> | |
33 | #include <asm/cacheflush.h> | |
34 | #include <asm/vdso.h> | |
35 | ||
36 | #define DEBUG_SIG 0 | |
37 | ||
38 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
39 | ||
40 | #define GP_REGS_SIZE32 min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
41 | ||
42 | /* | |
43 | * When we have signals to deliver, we set up on the | |
44 | * user stack, going down from the original stack pointer: | |
45 | * a sigregs32 struct | |
46 | * a sigcontext32 struct | |
47 | * a gap of __SIGNAL_FRAMESIZE32 bytes | |
48 | * | |
49 | * Each of these things must be a multiple of 16 bytes in size. | |
50 | * | |
51 | */ | |
52 | struct sigregs32 { | |
53 | struct mcontext32 mctx; /* all the register values */ | |
54 | /* | |
55 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
56 | * regs and 18 fp regs below sp before decrementing it. | |
57 | */ | |
58 | int abigap[56]; | |
59 | }; | |
60 | ||
61 | /* We use the mc_pad field for the signal return trampoline. */ | |
62 | #define tramp mc_pad | |
63 | ||
64 | /* | |
65 | * When we have rt signals to deliver, we set up on the | |
66 | * user stack, going down from the original stack pointer: | |
67 | * one rt_sigframe32 struct (siginfo + ucontext + ABI gap) | |
68 | * a gap of __SIGNAL_FRAMESIZE32+16 bytes | |
69 | * (the +16 is to get the siginfo and ucontext32 in the same | |
70 | * positions as in older kernels). | |
71 | * | |
72 | * Each of these things must be a multiple of 16 bytes in size. | |
73 | * | |
74 | */ | |
75 | struct rt_sigframe32 { | |
76 | compat_siginfo_t info; | |
77 | struct ucontext32 uc; | |
78 | /* | |
79 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
80 | * regs and 18 fp regs below sp before decrementing it. | |
81 | */ | |
82 | int abigap[56]; | |
83 | }; | |
84 | ||
85 | ||
86 | /* | |
87 | * Common utility functions used by signal and context support | |
88 | * | |
89 | */ | |
90 | ||
91 | /* | |
92 | * Restore the user process's signal mask | |
93 | * (implemented in signal.c) | |
94 | */ | |
95 | extern void restore_sigmask(sigset_t *set); | |
96 | ||
97 | /* | |
98 | * Functions for flipping sigsets (thanks to brain dead generic | |
99 | * implementation that makes things simple for little endian only | |
100 | */ | |
101 | static inline void compat_from_sigset(compat_sigset_t *compat, sigset_t *set) | |
102 | { | |
103 | switch (_NSIG_WORDS) { | |
104 | case 4: compat->sig[5] = set->sig[3] & 0xffffffffull ; | |
105 | compat->sig[7] = set->sig[3] >> 32; | |
106 | case 3: compat->sig[4] = set->sig[2] & 0xffffffffull ; | |
107 | compat->sig[5] = set->sig[2] >> 32; | |
108 | case 2: compat->sig[2] = set->sig[1] & 0xffffffffull ; | |
109 | compat->sig[3] = set->sig[1] >> 32; | |
110 | case 1: compat->sig[0] = set->sig[0] & 0xffffffffull ; | |
111 | compat->sig[1] = set->sig[0] >> 32; | |
112 | } | |
113 | } | |
114 | ||
115 | static inline void sigset_from_compat(sigset_t *set, compat_sigset_t *compat) | |
116 | { | |
117 | switch (_NSIG_WORDS) { | |
118 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32); | |
119 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32); | |
120 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32); | |
121 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32); | |
122 | } | |
123 | } | |
124 | ||
125 | ||
126 | /* | |
127 | * Save the current user registers on the user stack. | |
128 | * We only save the altivec registers if the process has used | |
129 | * altivec instructions at some point. | |
130 | */ | |
131 | static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame, int sigret) | |
132 | { | |
133 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
134 | int i, err = 0; | |
135 | ||
136 | /* Make sure floating point registers are stored in regs */ | |
137 | flush_fp_to_thread(current); | |
138 | ||
139 | /* save general and floating-point registers */ | |
140 | for (i = 0; i <= PT_RESULT; i ++) | |
141 | err |= __put_user((unsigned int)gregs[i], &frame->mc_gregs[i]); | |
142 | err |= __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
143 | ELF_NFPREG * sizeof(double)); | |
144 | if (err) | |
145 | return 1; | |
146 | ||
147 | current->thread.fpscr = 0; /* turn off all fp exceptions */ | |
148 | ||
149 | #ifdef CONFIG_ALTIVEC | |
150 | /* save altivec registers */ | |
151 | if (current->thread.used_vr) { | |
152 | flush_altivec_to_thread(current); | |
153 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
154 | ELF_NVRREG32 * sizeof(vector128))) | |
155 | return 1; | |
156 | /* set MSR_VEC in the saved MSR value to indicate that | |
157 | frame->mc_vregs contains valid data */ | |
158 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
159 | return 1; | |
160 | } | |
161 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
162 | ||
163 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
164 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
165 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
166 | * most significant bits of that same vector. --BenH | |
167 | */ | |
168 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
169 | return 1; | |
170 | #endif /* CONFIG_ALTIVEC */ | |
171 | ||
172 | if (sigret) { | |
173 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
174 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
175 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
176 | return 1; | |
177 | flush_icache_range((unsigned long) &frame->tramp[0], | |
178 | (unsigned long) &frame->tramp[2]); | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
185 | * Restore the current user register values from the user stack, | |
186 | * (except for MSR). | |
187 | */ | |
188 | static long restore_user_regs(struct pt_regs *regs, | |
189 | struct mcontext32 __user *sr, int sig) | |
190 | { | |
191 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
192 | int i; | |
193 | long err = 0; | |
194 | unsigned int save_r2 = 0; | |
195 | #ifdef CONFIG_ALTIVEC | |
196 | unsigned long msr; | |
197 | #endif | |
198 | ||
199 | /* | |
200 | * restore general registers but not including MSR or SOFTE. Also | |
201 | * take care of keeping r2 (TLS) intact if not a signal | |
202 | */ | |
203 | if (!sig) | |
204 | save_r2 = (unsigned int)regs->gpr[2]; | |
205 | for (i = 0; i <= PT_RESULT; i++) { | |
206 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
207 | continue; | |
208 | err |= __get_user(gregs[i], &sr->mc_gregs[i]); | |
209 | } | |
210 | if (!sig) | |
211 | regs->gpr[2] = (unsigned long) save_r2; | |
212 | if (err) | |
213 | return 1; | |
214 | ||
215 | /* force the process to reload the FP registers from | |
216 | current->thread when it next does FP instructions */ | |
217 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
218 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
219 | sizeof(sr->mc_fregs))) | |
220 | return 1; | |
221 | ||
222 | #ifdef CONFIG_ALTIVEC | |
223 | /* force the process to reload the altivec registers from | |
224 | current->thread when it next does altivec instructions */ | |
225 | regs->msr &= ~MSR_VEC; | |
226 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { | |
227 | /* restore altivec registers from the stack */ | |
228 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
229 | sizeof(sr->mc_vregs))) | |
230 | return 1; | |
231 | } else if (current->thread.used_vr) | |
232 | memset(current->thread.vr, 0, ELF_NVRREG32 * sizeof(vector128)); | |
233 | ||
234 | /* Always get VRSAVE back */ | |
235 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
236 | return 1; | |
237 | #endif /* CONFIG_ALTIVEC */ | |
238 | ||
239 | #ifndef CONFIG_SMP | |
240 | preempt_disable(); | |
241 | if (last_task_used_math == current) | |
242 | last_task_used_math = NULL; | |
243 | if (last_task_used_altivec == current) | |
244 | last_task_used_altivec = NULL; | |
245 | preempt_enable(); | |
246 | #endif | |
247 | return 0; | |
248 | } | |
249 | ||
250 | ||
251 | /* | |
252 | * Start of nonRT signal support | |
253 | * | |
254 | * sigset_t is 32 bits for non-rt signals | |
255 | * | |
256 | * System Calls | |
257 | * sigaction sys32_sigaction | |
258 | * sigreturn sys32_sigreturn | |
259 | * | |
260 | * Note sigsuspend has no special 32 bit routine - uses the 64 bit routine | |
261 | * | |
262 | * Other routines | |
263 | * setup_frame32 | |
264 | */ | |
265 | ||
266 | /* | |
267 | * Atomically swap in the new signal mask, and wait for a signal. | |
268 | */ | |
269 | long sys32_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7, | |
270 | struct pt_regs *regs) | |
271 | { | |
272 | sigset_t saveset; | |
273 | ||
274 | mask &= _BLOCKABLE; | |
275 | spin_lock_irq(¤t->sighand->siglock); | |
276 | saveset = current->blocked; | |
277 | siginitset(¤t->blocked, mask); | |
278 | recalc_sigpending(); | |
279 | spin_unlock_irq(¤t->sighand->siglock); | |
280 | ||
281 | regs->result = -EINTR; | |
282 | regs->gpr[3] = EINTR; | |
283 | regs->ccr |= 0x10000000; | |
284 | while (1) { | |
285 | current->state = TASK_INTERRUPTIBLE; | |
286 | schedule(); | |
287 | if (do_signal32(&saveset, regs)) | |
288 | /* | |
289 | * Returning 0 means we return to userspace via | |
290 | * ret_from_except and thus restore all user | |
291 | * registers from *regs. This is what we need | |
292 | * to do when a signal has been delivered. | |
293 | */ | |
294 | return 0; | |
295 | } | |
296 | } | |
297 | ||
298 | long sys32_sigaction(int sig, struct old_sigaction32 __user *act, | |
299 | struct old_sigaction32 __user *oact) | |
300 | { | |
301 | struct k_sigaction new_ka, old_ka; | |
302 | int ret; | |
303 | ||
304 | if (sig < 0) | |
305 | sig = -sig; | |
306 | ||
307 | if (act) { | |
308 | compat_old_sigset_t mask; | |
309 | compat_uptr_t handler, restorer; | |
310 | ||
311 | if (get_user(handler, &act->sa_handler) || | |
312 | __get_user(restorer, &act->sa_restorer) || | |
313 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || | |
314 | __get_user(mask, &act->sa_mask)) | |
315 | return -EFAULT; | |
316 | new_ka.sa.sa_handler = compat_ptr(handler); | |
317 | new_ka.sa.sa_restorer = compat_ptr(restorer); | |
318 | siginitset(&new_ka.sa.sa_mask, mask); | |
319 | } | |
320 | ||
321 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
322 | if (!ret && oact) { | |
323 | if (put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) || | |
324 | __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) || | |
325 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
326 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
327 | return -EFAULT; | |
328 | } | |
329 | ||
330 | return ret; | |
331 | } | |
332 | ||
333 | ||
334 | ||
335 | /* | |
336 | * Start of RT signal support | |
337 | * | |
338 | * sigset_t is 64 bits for rt signals | |
339 | * | |
340 | * System Calls | |
341 | * sigaction sys32_rt_sigaction | |
342 | * sigpending sys32_rt_sigpending | |
343 | * sigprocmask sys32_rt_sigprocmask | |
344 | * sigreturn sys32_rt_sigreturn | |
345 | * sigqueueinfo sys32_rt_sigqueueinfo | |
346 | * sigsuspend sys32_rt_sigsuspend | |
347 | * | |
348 | * Other routines | |
349 | * setup_rt_frame32 | |
350 | * copy_siginfo_to_user32 | |
351 | * siginfo32to64 | |
352 | */ | |
353 | ||
354 | ||
355 | long sys32_rt_sigaction(int sig, const struct sigaction32 __user *act, | |
356 | struct sigaction32 __user *oact, size_t sigsetsize) | |
357 | { | |
358 | struct k_sigaction new_ka, old_ka; | |
359 | int ret; | |
360 | compat_sigset_t set32; | |
361 | ||
362 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
363 | if (sigsetsize != sizeof(compat_sigset_t)) | |
364 | return -EINVAL; | |
365 | ||
366 | if (act) { | |
367 | compat_uptr_t handler; | |
368 | ||
369 | ret = get_user(handler, &act->sa_handler); | |
370 | new_ka.sa.sa_handler = compat_ptr(handler); | |
371 | ret |= __copy_from_user(&set32, &act->sa_mask, | |
372 | sizeof(compat_sigset_t)); | |
373 | sigset_from_compat(&new_ka.sa.sa_mask, &set32); | |
374 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
375 | if (ret) | |
376 | return -EFAULT; | |
377 | } | |
378 | ||
379 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
380 | if (!ret && oact) { | |
381 | compat_from_sigset(&set32, &old_ka.sa.sa_mask); | |
382 | ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler); | |
383 | ret |= __copy_to_user(&oact->sa_mask, &set32, | |
384 | sizeof(compat_sigset_t)); | |
385 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
386 | } | |
387 | return ret; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Note: it is necessary to treat how as an unsigned int, with the | |
392 | * corresponding cast to a signed int to insure that the proper | |
393 | * conversion (sign extension) between the register representation | |
394 | * of a signed int (msr in 32-bit mode) and the register representation | |
395 | * of a signed int (msr in 64-bit mode) is performed. | |
396 | */ | |
397 | long sys32_rt_sigprocmask(u32 how, compat_sigset_t __user *set, | |
398 | compat_sigset_t __user *oset, size_t sigsetsize) | |
399 | { | |
400 | sigset_t s; | |
401 | sigset_t __user *up; | |
402 | compat_sigset_t s32; | |
403 | int ret; | |
404 | mm_segment_t old_fs = get_fs(); | |
405 | ||
406 | if (set) { | |
407 | if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) | |
408 | return -EFAULT; | |
409 | sigset_from_compat(&s, &s32); | |
410 | } | |
411 | ||
412 | set_fs(KERNEL_DS); | |
413 | /* This is valid because of the set_fs() */ | |
414 | up = (sigset_t __user *) &s; | |
415 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
416 | sigsetsize); | |
417 | set_fs(old_fs); | |
418 | if (ret) | |
419 | return ret; | |
420 | if (oset) { | |
421 | compat_from_sigset(&s32, &s); | |
422 | if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) | |
423 | return -EFAULT; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | long sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) | |
429 | { | |
430 | sigset_t s; | |
431 | compat_sigset_t s32; | |
432 | int ret; | |
433 | mm_segment_t old_fs = get_fs(); | |
434 | ||
435 | set_fs(KERNEL_DS); | |
436 | /* The __user pointer cast is valid because of the set_fs() */ | |
437 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
438 | set_fs(old_fs); | |
439 | if (!ret) { | |
440 | compat_from_sigset(&s32, &s); | |
441 | if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) | |
442 | return -EFAULT; | |
443 | } | |
444 | return ret; | |
445 | } | |
446 | ||
447 | ||
448 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
449 | { | |
450 | int err; | |
451 | ||
452 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
453 | return -EFAULT; | |
454 | ||
455 | /* If you change siginfo_t structure, please be sure | |
456 | * this code is fixed accordingly. | |
457 | * It should never copy any pad contained in the structure | |
458 | * to avoid security leaks, but must copy the generic | |
459 | * 3 ints plus the relevant union member. | |
460 | * This routine must convert siginfo from 64bit to 32bit as well | |
461 | * at the same time. | |
462 | */ | |
463 | err = __put_user(s->si_signo, &d->si_signo); | |
464 | err |= __put_user(s->si_errno, &d->si_errno); | |
465 | err |= __put_user((short)s->si_code, &d->si_code); | |
466 | if (s->si_code < 0) | |
467 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
468 | SI_PAD_SIZE32); | |
469 | else switch(s->si_code >> 16) { | |
470 | case __SI_CHLD >> 16: | |
471 | err |= __put_user(s->si_pid, &d->si_pid); | |
472 | err |= __put_user(s->si_uid, &d->si_uid); | |
473 | err |= __put_user(s->si_utime, &d->si_utime); | |
474 | err |= __put_user(s->si_stime, &d->si_stime); | |
475 | err |= __put_user(s->si_status, &d->si_status); | |
476 | break; | |
477 | case __SI_FAULT >> 16: | |
478 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
479 | &d->si_addr); | |
480 | break; | |
481 | case __SI_POLL >> 16: | |
482 | err |= __put_user(s->si_band, &d->si_band); | |
483 | err |= __put_user(s->si_fd, &d->si_fd); | |
484 | break; | |
485 | case __SI_TIMER >> 16: | |
486 | err |= __put_user(s->si_tid, &d->si_tid); | |
487 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
488 | err |= __put_user(s->si_int, &d->si_int); | |
489 | break; | |
490 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
491 | case __SI_MESGQ >> 16: | |
492 | err |= __put_user(s->si_int, &d->si_int); | |
493 | /* fallthrough */ | |
494 | case __SI_KILL >> 16: | |
495 | default: | |
496 | err |= __put_user(s->si_pid, &d->si_pid); | |
497 | err |= __put_user(s->si_uid, &d->si_uid); | |
498 | break; | |
499 | } | |
500 | return err; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
505 | * corresponding cast to a signed int to insure that the proper conversion | |
506 | * (sign extension) between the register representation of a signed int | |
507 | * (msr in 32-bit mode) and the register representation of a signed int | |
508 | * (msr in 64-bit mode) is performed. | |
509 | */ | |
510 | long sys32_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) | |
511 | { | |
512 | siginfo_t info; | |
513 | int ret; | |
514 | mm_segment_t old_fs = get_fs(); | |
515 | ||
516 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || | |
517 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
518 | return -EFAULT; | |
519 | set_fs (KERNEL_DS); | |
520 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
521 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
522 | set_fs (old_fs); | |
523 | return ret; | |
524 | } | |
525 | ||
526 | int sys32_rt_sigsuspend(compat_sigset_t __user * unewset, size_t sigsetsize, int p3, | |
527 | int p4, int p6, int p7, struct pt_regs *regs) | |
528 | { | |
529 | sigset_t saveset, newset; | |
530 | compat_sigset_t s32; | |
531 | ||
532 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
533 | if (sigsetsize != sizeof(sigset_t)) | |
534 | return -EINVAL; | |
535 | ||
536 | if (copy_from_user(&s32, unewset, sizeof(s32))) | |
537 | return -EFAULT; | |
538 | ||
539 | /* | |
540 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
541 | * in the "wrong" endian in 32-bit user storage). | |
542 | */ | |
543 | sigset_from_compat(&newset, &s32); | |
544 | ||
545 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
546 | spin_lock_irq(¤t->sighand->siglock); | |
547 | saveset = current->blocked; | |
548 | current->blocked = newset; | |
549 | recalc_sigpending(); | |
550 | spin_unlock_irq(¤t->sighand->siglock); | |
551 | ||
552 | regs->result = -EINTR; | |
553 | regs->gpr[3] = EINTR; | |
554 | regs->ccr |= 0x10000000; | |
555 | while (1) { | |
556 | current->state = TASK_INTERRUPTIBLE; | |
557 | schedule(); | |
558 | if (do_signal32(&saveset, regs)) | |
559 | /* | |
560 | * Returning 0 means we return to userspace via | |
561 | * ret_from_except and thus restore all user | |
562 | * registers from *regs. This is what we need | |
563 | * to do when a signal has been delivered. | |
564 | */ | |
565 | return 0; | |
566 | } | |
567 | } | |
568 | ||
569 | /* | |
570 | * Start Alternate signal stack support | |
571 | * | |
572 | * System Calls | |
573 | * sigaltatck sys32_sigaltstack | |
574 | */ | |
575 | ||
576 | int sys32_sigaltstack(u32 __new, u32 __old, int r5, | |
577 | int r6, int r7, int r8, struct pt_regs *regs) | |
578 | { | |
579 | stack_32_t __user * newstack = (stack_32_t __user *)(long) __new; | |
580 | stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old; | |
581 | stack_t uss, uoss; | |
582 | int ret; | |
583 | mm_segment_t old_fs; | |
584 | unsigned long sp; | |
585 | compat_uptr_t ss_sp; | |
586 | ||
587 | /* | |
588 | * set sp to the user stack on entry to the system call | |
589 | * the system call router sets R9 to the saved registers | |
590 | */ | |
591 | sp = regs->gpr[1]; | |
592 | ||
593 | /* Put new stack info in local 64 bit stack struct */ | |
594 | if (newstack) { | |
595 | if (get_user(ss_sp, &newstack->ss_sp) || | |
596 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
597 | __get_user(uss.ss_size, &newstack->ss_size)) | |
598 | return -EFAULT; | |
599 | uss.ss_sp = compat_ptr(ss_sp); | |
600 | } | |
601 | ||
602 | old_fs = get_fs(); | |
603 | set_fs(KERNEL_DS); | |
604 | /* The __user pointer casts are valid because of the set_fs() */ | |
605 | ret = do_sigaltstack( | |
606 | newstack ? (stack_t __user *) &uss : NULL, | |
607 | oldstack ? (stack_t __user *) &uoss : NULL, | |
608 | sp); | |
609 | set_fs(old_fs); | |
610 | /* Copy the stack information to the user output buffer */ | |
611 | if (!ret && oldstack && | |
612 | (put_user((long)uoss.ss_sp, &oldstack->ss_sp) || | |
613 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || | |
614 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
615 | return -EFAULT; | |
616 | return ret; | |
617 | } | |
618 | ||
619 | ||
620 | /* | |
621 | * Set up a signal frame for a "real-time" signal handler | |
622 | * (one which gets siginfo). | |
623 | */ | |
624 | static int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, | |
625 | siginfo_t *info, sigset_t *oldset, | |
626 | struct pt_regs * regs, unsigned long newsp) | |
627 | { | |
628 | struct rt_sigframe32 __user *rt_sf; | |
629 | struct mcontext32 __user *frame; | |
630 | unsigned long origsp = newsp; | |
631 | compat_sigset_t c_oldset; | |
632 | ||
633 | /* Set up Signal Frame */ | |
634 | /* Put a Real Time Context onto stack */ | |
635 | newsp -= sizeof(*rt_sf); | |
636 | rt_sf = (struct rt_sigframe32 __user *)newsp; | |
637 | ||
638 | /* create a stack frame for the caller of the handler */ | |
639 | newsp -= __SIGNAL_FRAMESIZE32 + 16; | |
640 | ||
641 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
642 | goto badframe; | |
643 | ||
644 | compat_from_sigset(&c_oldset, oldset); | |
645 | ||
646 | /* Put the siginfo & fill in most of the ucontext */ | |
647 | if (copy_siginfo_to_user32(&rt_sf->info, info) | |
648 | || __put_user(0, &rt_sf->uc.uc_flags) | |
649 | || __put_user(0, &rt_sf->uc.uc_link) | |
650 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
651 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
652 | &rt_sf->uc.uc_stack.ss_flags) | |
653 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
654 | || __put_user((u32)(u64)&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs) | |
655 | || __copy_to_user(&rt_sf->uc.uc_sigmask, &c_oldset, sizeof(c_oldset))) | |
656 | goto badframe; | |
657 | ||
658 | /* Save user registers on the stack */ | |
659 | frame = &rt_sf->uc.uc_mcontext; | |
660 | if (put_user(regs->gpr[1], (unsigned long __user *)newsp)) | |
661 | goto badframe; | |
662 | ||
663 | if (vdso32_rt_sigtramp && current->thread.vdso_base) { | |
664 | if (save_user_regs(regs, frame, 0)) | |
665 | goto badframe; | |
666 | regs->link = current->thread.vdso_base + vdso32_rt_sigtramp; | |
667 | } else { | |
668 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) | |
669 | goto badframe; | |
670 | regs->link = (unsigned long) frame->tramp; | |
671 | } | |
672 | regs->gpr[1] = (unsigned long) newsp; | |
673 | regs->gpr[3] = sig; | |
674 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
675 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
676 | regs->gpr[6] = (unsigned long) rt_sf; | |
677 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
678 | regs->trap = 0; | |
679 | regs->result = 0; | |
680 | ||
681 | if (test_thread_flag(TIF_SINGLESTEP)) | |
682 | ptrace_notify(SIGTRAP); | |
683 | ||
684 | return 1; | |
685 | ||
686 | badframe: | |
687 | #if DEBUG_SIG | |
688 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", | |
689 | regs, frame, newsp); | |
690 | #endif | |
691 | force_sigsegv(sig, current); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static long do_setcontext32(struct ucontext32 __user *ucp, struct pt_regs *regs, int sig) | |
696 | { | |
697 | compat_sigset_t c_set; | |
698 | sigset_t set; | |
699 | u32 mcp; | |
700 | ||
701 | if (__copy_from_user(&c_set, &ucp->uc_sigmask, sizeof(c_set)) | |
702 | || __get_user(mcp, &ucp->uc_regs)) | |
703 | return -EFAULT; | |
704 | sigset_from_compat(&set, &c_set); | |
705 | restore_sigmask(&set); | |
706 | if (restore_user_regs(regs, (struct mcontext32 __user *)(u64)mcp, sig)) | |
707 | return -EFAULT; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | /* | |
713 | * Handle {get,set,swap}_context operations for 32 bits processes | |
714 | */ | |
715 | ||
716 | long sys32_swapcontext(struct ucontext32 __user *old_ctx, | |
717 | struct ucontext32 __user *new_ctx, | |
718 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
719 | { | |
720 | unsigned char tmp; | |
721 | compat_sigset_t c_set; | |
722 | ||
723 | /* Context size is for future use. Right now, we only make sure | |
724 | * we are passed something we understand | |
725 | */ | |
726 | if (ctx_size < sizeof(struct ucontext32)) | |
727 | return -EINVAL; | |
728 | ||
729 | if (old_ctx != NULL) { | |
730 | compat_from_sigset(&c_set, ¤t->blocked); | |
731 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) | |
732 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) | |
733 | || __copy_to_user(&old_ctx->uc_sigmask, &c_set, sizeof(c_set)) | |
734 | || __put_user((u32)(u64)&old_ctx->uc_mcontext, &old_ctx->uc_regs)) | |
735 | return -EFAULT; | |
736 | } | |
737 | if (new_ctx == NULL) | |
738 | return 0; | |
739 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
740 | || __get_user(tmp, (u8 __user *) new_ctx) | |
741 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
742 | return -EFAULT; | |
743 | ||
744 | /* | |
745 | * If we get a fault copying the context into the kernel's | |
746 | * image of the user's registers, we can't just return -EFAULT | |
747 | * because the user's registers will be corrupted. For instance | |
748 | * the NIP value may have been updated but not some of the | |
749 | * other registers. Given that we have done the access_ok | |
750 | * and successfully read the first and last bytes of the region | |
751 | * above, this should only happen in an out-of-memory situation | |
752 | * or if another thread unmaps the region containing the context. | |
753 | * We kill the task with a SIGSEGV in this situation. | |
754 | */ | |
755 | if (do_setcontext32(new_ctx, regs, 0)) | |
756 | do_exit(SIGSEGV); | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
761 | long sys32_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, | |
762 | struct pt_regs *regs) | |
763 | { | |
764 | struct rt_sigframe32 __user *rt_sf; | |
765 | int ret; | |
766 | ||
767 | ||
768 | /* Always make any pending restarted system calls return -EINTR */ | |
769 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
770 | ||
771 | rt_sf = (struct rt_sigframe32 __user *) | |
772 | (regs->gpr[1] + __SIGNAL_FRAMESIZE32 + 16); | |
773 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) | |
774 | goto bad; | |
775 | if (do_setcontext32(&rt_sf->uc, regs, 1)) | |
776 | goto bad; | |
777 | ||
778 | /* | |
779 | * It's not clear whether or why it is desirable to save the | |
780 | * sigaltstack setting on signal delivery and restore it on | |
781 | * signal return. But other architectures do this and we have | |
782 | * always done it up until now so it is probably better not to | |
783 | * change it. -- paulus | |
784 | * We use the sys32_ version that does the 32/64 bits conversion | |
785 | * and takes userland pointer directly. What about error checking ? | |
786 | * nobody does any... | |
787 | */ | |
788 | sys32_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); | |
789 | ||
790 | ret = regs->result; | |
791 | ||
792 | return ret; | |
793 | ||
794 | bad: | |
795 | force_sig(SIGSEGV, current); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | ||
800 | /* | |
801 | * OK, we're invoking a handler | |
802 | */ | |
803 | static int handle_signal32(unsigned long sig, struct k_sigaction *ka, | |
804 | siginfo_t *info, sigset_t *oldset, | |
805 | struct pt_regs * regs, unsigned long newsp) | |
806 | { | |
807 | struct sigcontext32 __user *sc; | |
808 | struct sigregs32 __user *frame; | |
809 | unsigned long origsp = newsp; | |
810 | ||
811 | /* Set up Signal Frame */ | |
812 | newsp -= sizeof(struct sigregs32); | |
813 | frame = (struct sigregs32 __user *) newsp; | |
814 | ||
815 | /* Put a sigcontext on the stack */ | |
816 | newsp -= sizeof(*sc); | |
817 | sc = (struct sigcontext32 __user *) newsp; | |
818 | ||
819 | /* create a stack frame for the caller of the handler */ | |
820 | newsp -= __SIGNAL_FRAMESIZE32; | |
821 | ||
822 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
823 | goto badframe; | |
824 | ||
825 | #if _NSIG != 64 | |
826 | #error "Please adjust handle_signal32()" | |
827 | #endif | |
828 | if (__put_user((u32)(u64)ka->sa.sa_handler, &sc->handler) | |
829 | || __put_user(oldset->sig[0], &sc->oldmask) | |
830 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) | |
831 | || __put_user((u32)(u64)frame, &sc->regs) | |
832 | || __put_user(sig, &sc->signal)) | |
833 | goto badframe; | |
834 | ||
835 | if (vdso32_sigtramp && current->thread.vdso_base) { | |
836 | if (save_user_regs(regs, &frame->mctx, 0)) | |
837 | goto badframe; | |
838 | regs->link = current->thread.vdso_base + vdso32_sigtramp; | |
839 | } else { | |
840 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) | |
841 | goto badframe; | |
842 | regs->link = (unsigned long) frame->mctx.tramp; | |
843 | } | |
844 | ||
845 | if (put_user(regs->gpr[1], (unsigned long __user *)newsp)) | |
846 | goto badframe; | |
847 | regs->gpr[1] = (unsigned long) newsp; | |
848 | regs->gpr[3] = sig; | |
849 | regs->gpr[4] = (unsigned long) sc; | |
850 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
851 | regs->trap = 0; | |
852 | regs->result = 0; | |
853 | ||
854 | if (test_thread_flag(TIF_SINGLESTEP)) | |
855 | ptrace_notify(SIGTRAP); | |
856 | ||
857 | return 1; | |
858 | ||
859 | badframe: | |
860 | #if DEBUG_SIG | |
861 | printk("badframe in handle_signal, regs=%p frame=%x newsp=%x\n", | |
862 | regs, frame, *newspp); | |
863 | #endif | |
864 | force_sigsegv(sig, current); | |
865 | return 0; | |
866 | } | |
867 | ||
868 | /* | |
869 | * Do a signal return; undo the signal stack. | |
870 | */ | |
871 | long sys32_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, | |
872 | struct pt_regs *regs) | |
873 | { | |
874 | struct sigcontext32 __user *sc; | |
875 | struct sigcontext32 sigctx; | |
876 | struct mcontext32 __user *sr; | |
877 | sigset_t set; | |
878 | int ret; | |
879 | ||
880 | /* Always make any pending restarted system calls return -EINTR */ | |
881 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
882 | ||
883 | sc = (struct sigcontext32 __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32); | |
884 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) | |
885 | goto badframe; | |
886 | ||
887 | /* | |
888 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
889 | * unused part of the signal stackframe | |
890 | */ | |
891 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
892 | restore_sigmask(&set); | |
893 | ||
894 | sr = (struct mcontext32 __user *)(u64)sigctx.regs; | |
895 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) | |
896 | || restore_user_regs(regs, sr, 1)) | |
897 | goto badframe; | |
898 | ||
899 | ret = regs->result; | |
900 | return ret; | |
901 | ||
902 | badframe: | |
903 | force_sig(SIGSEGV, current); | |
904 | return 0; | |
905 | } | |
906 | ||
907 | ||
908 | ||
909 | /* | |
910 | * Start of do_signal32 routine | |
911 | * | |
912 | * This routine gets control when a pending signal needs to be processed | |
913 | * in the 32 bit target thread - | |
914 | * | |
915 | * It handles both rt and non-rt signals | |
916 | */ | |
917 | ||
918 | /* | |
919 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
920 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
921 | * mistake. | |
922 | */ | |
923 | ||
924 | int do_signal32(sigset_t *oldset, struct pt_regs *regs) | |
925 | { | |
926 | siginfo_t info; | |
927 | unsigned int frame, newsp; | |
928 | int signr, ret; | |
929 | struct k_sigaction ka; | |
930 | ||
931 | if (!oldset) | |
932 | oldset = ¤t->blocked; | |
933 | ||
934 | newsp = frame = 0; | |
935 | ||
936 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
937 | ||
938 | if (TRAP(regs) == 0x0C00 /* System Call! */ | |
939 | && regs->ccr & 0x10000000 /* error signalled */ | |
940 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
941 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
942 | || ret == ERESTART_RESTARTBLOCK)) { | |
943 | ||
944 | if (signr > 0 | |
945 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
946 | || (ret == ERESTARTSYS | |
947 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
948 | /* make the system call return an EINTR error */ | |
949 | regs->result = -EINTR; | |
950 | regs->gpr[3] = EINTR; | |
951 | /* note that the cr0.SO bit is already set */ | |
952 | } else { | |
953 | regs->nip -= 4; /* Back up & retry system call */ | |
954 | regs->result = 0; | |
955 | regs->trap = 0; | |
956 | if (ret == ERESTART_RESTARTBLOCK) | |
957 | regs->gpr[0] = __NR_restart_syscall; | |
958 | else | |
959 | regs->gpr[3] = regs->orig_gpr3; | |
960 | } | |
961 | } | |
962 | ||
963 | if (signr == 0) | |
964 | return 0; /* no signals delivered */ | |
965 | ||
966 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
967 | && (!on_sig_stack(regs->gpr[1]))) | |
968 | newsp = (current->sas_ss_sp + current->sas_ss_size); | |
969 | else | |
970 | newsp = regs->gpr[1]; | |
971 | newsp &= ~0xfUL; | |
972 | ||
973 | /* Whee! Actually deliver the signal. */ | |
974 | if (ka.sa.sa_flags & SA_SIGINFO) | |
975 | ret = handle_rt_signal32(signr, &ka, &info, oldset, regs, newsp); | |
976 | else | |
977 | ret = handle_signal32(signr, &ka, &info, oldset, regs, newsp); | |
978 | ||
979 | if (ret && !(ka.sa.sa_flags & SA_NODEFER)) { | |
980 | spin_lock_irq(¤t->sighand->siglock); | |
981 | sigorsets(¤t->blocked, ¤t->blocked, | |
982 | &ka.sa.sa_mask); | |
983 | sigaddset(¤t->blocked, signr); | |
984 | recalc_sigpending(); | |
985 | spin_unlock_irq(¤t->sighand->siglock); | |
986 | } | |
987 | ||
988 | return ret; | |
989 | } |