Commit | Line | Data |
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1da177e4 | 1 | /* |
81e7009e | 2 | * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC |
1da177e4 | 3 | * |
81e7009e SR |
4 | * PowerPC version |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
1da177e4 LT |
6 | * Copyright (C) 2001 IBM |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) | |
9 | * | |
81e7009e SR |
10 | * Derived from "arch/i386/kernel/signal.c" |
11 | * Copyright (C) 1991, 1992 Linus Torvalds | |
12 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
1da177e4 | 13 | * |
81e7009e SR |
14 | * This program is free software; you can redistribute it and/or |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
1da177e4 LT |
18 | */ |
19 | ||
20 | #include <linux/config.h> | |
21 | #include <linux/sched.h> | |
81e7009e | 22 | #include <linux/mm.h> |
1da177e4 LT |
23 | #include <linux/smp.h> |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/signal.h> | |
1da177e4 LT |
27 | #include <linux/errno.h> |
28 | #include <linux/elf.h> | |
81e7009e SR |
29 | #ifdef CONFIG_PPC64 |
30 | #include <linux/syscalls.h> | |
1da177e4 LT |
31 | #include <linux/compat.h> |
32 | #include <linux/ptrace.h> | |
81e7009e SR |
33 | #else |
34 | #include <linux/wait.h> | |
35 | #include <linux/ptrace.h> | |
36 | #include <linux/unistd.h> | |
37 | #include <linux/stddef.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/binfmts.h> | |
40 | #include <linux/suspend.h> | |
41 | #endif | |
42 | ||
1da177e4 | 43 | #include <asm/uaccess.h> |
81e7009e | 44 | #include <asm/cacheflush.h> |
c5ff7001 | 45 | #include <asm/sigcontext.h> |
a7f290da | 46 | #include <asm/vdso.h> |
81e7009e | 47 | #ifdef CONFIG_PPC64 |
879168ee | 48 | #include "ppc32.h" |
1da177e4 | 49 | #include <asm/unistd.h> |
81e7009e SR |
50 | #else |
51 | #include <asm/ucontext.h> | |
52 | #include <asm/pgtable.h> | |
53 | #endif | |
1da177e4 | 54 | |
81e7009e | 55 | #undef DEBUG_SIG |
1da177e4 LT |
56 | |
57 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
58 | ||
81e7009e SR |
59 | #ifdef CONFIG_PPC64 |
60 | #define do_signal do_signal32 | |
b09a4913 SR |
61 | #define sys_sigsuspend compat_sys_sigsuspend |
62 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
63 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
64 | #define sys_sigaction compat_sys_sigaction | |
65 | #define sys_swapcontext compat_sys_swapcontext | |
66 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
67 | |
68 | #define old_sigaction old_sigaction32 | |
69 | #define sigcontext sigcontext32 | |
70 | #define mcontext mcontext32 | |
71 | #define ucontext ucontext32 | |
72 | ||
73 | /* | |
74 | * Returning 0 means we return to userspace via | |
75 | * ret_from_except and thus restore all user | |
76 | * registers from *regs. This is what we need | |
77 | * to do when a signal has been delivered. | |
78 | */ | |
79 | #define sigreturn_exit(regs) return 0 | |
80 | ||
81 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
82 | #undef __SIGNAL_FRAMESIZE | |
83 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
84 | #undef ELF_NVRREG | |
85 | #define ELF_NVRREG ELF_NVRREG32 | |
86 | ||
87 | /* | |
88 | * Functions for flipping sigsets (thanks to brain dead generic | |
89 | * implementation that makes things simple for little endian only) | |
90 | */ | |
91 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
92 | { | |
93 | compat_sigset_t cset; | |
94 | ||
95 | switch (_NSIG_WORDS) { | |
96 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
97 | cset.sig[7] = set->sig[3] >> 32; | |
98 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
99 | cset.sig[5] = set->sig[2] >> 32; | |
100 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
101 | cset.sig[3] = set->sig[1] >> 32; | |
102 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
103 | cset.sig[1] = set->sig[0] >> 32; | |
104 | } | |
105 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
106 | } | |
107 | ||
9b7cf8b4 PM |
108 | static inline int get_sigset_t(sigset_t *set, |
109 | const compat_sigset_t __user *uset) | |
81e7009e SR |
110 | { |
111 | compat_sigset_t s32; | |
112 | ||
113 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
114 | return -EFAULT; | |
115 | ||
116 | /* | |
117 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
118 | * in the "wrong" endian in 32-bit user storage). | |
119 | */ | |
120 | switch (_NSIG_WORDS) { | |
121 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
122 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
123 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
124 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
130 | struct old_sigaction __user *act) | |
131 | { | |
132 | compat_old_sigset_t mask; | |
133 | compat_uptr_t handler, restorer; | |
134 | ||
135 | if (get_user(handler, &act->sa_handler) || | |
136 | __get_user(restorer, &act->sa_restorer) || | |
137 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
138 | __get_user(mask, &act->sa_mask)) | |
139 | return -EFAULT; | |
140 | new_ka->sa.sa_handler = compat_ptr(handler); | |
141 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
142 | siginitset(&new_ka->sa.sa_mask, mask); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static inline compat_uptr_t to_user_ptr(void *kp) | |
147 | { | |
148 | return (compat_uptr_t)(u64)kp; | |
149 | } | |
150 | ||
151 | #define from_user_ptr(p) compat_ptr(p) | |
152 | ||
153 | static inline int save_general_regs(struct pt_regs *regs, | |
154 | struct mcontext __user *frame) | |
155 | { | |
156 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
157 | int i; | |
158 | ||
159 | for (i = 0; i <= PT_RESULT; i ++) | |
160 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) | |
161 | return -EFAULT; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | static inline int restore_general_regs(struct pt_regs *regs, | |
166 | struct mcontext __user *sr) | |
167 | { | |
168 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
169 | int i; | |
170 | ||
171 | for (i = 0; i <= PT_RESULT; i++) { | |
172 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
173 | continue; | |
174 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
175 | return -EFAULT; | |
176 | } | |
177 | return 0; | |
178 | } | |
179 | ||
180 | #else /* CONFIG_PPC64 */ | |
181 | ||
182 | extern void sigreturn_exit(struct pt_regs *); | |
183 | ||
184 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) | |
185 | ||
186 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
187 | { | |
188 | return copy_to_user(uset, set, sizeof(*uset)); | |
189 | } | |
190 | ||
9b7cf8b4 | 191 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
192 | { |
193 | return copy_from_user(set, uset, sizeof(*uset)); | |
194 | } | |
195 | ||
196 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
197 | struct old_sigaction __user *act) | |
198 | { | |
199 | old_sigset_t mask; | |
200 | ||
201 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
202 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
203 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
204 | return -EFAULT; | |
205 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
206 | __get_user(mask, &act->sa_mask); | |
207 | siginitset(&new_ka->sa.sa_mask, mask); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | #define to_user_ptr(p) (p) | |
212 | #define from_user_ptr(p) (p) | |
213 | ||
214 | static inline int save_general_regs(struct pt_regs *regs, | |
215 | struct mcontext __user *frame) | |
216 | { | |
217 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); | |
218 | } | |
219 | ||
220 | static inline int restore_general_regs(struct pt_regs *regs, | |
221 | struct mcontext __user *sr) | |
222 | { | |
223 | /* copy up to but not including MSR */ | |
224 | if (__copy_from_user(regs, &sr->mc_gregs, | |
225 | PT_MSR * sizeof(elf_greg_t))) | |
226 | return -EFAULT; | |
227 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
228 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
229 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
230 | return -EFAULT; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | #endif /* CONFIG_PPC64 */ | |
235 | ||
236 | int do_signal(sigset_t *oldset, struct pt_regs *regs); | |
237 | ||
238 | /* | |
239 | * Atomically swap in the new signal mask, and wait for a signal. | |
240 | */ | |
241 | long sys_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7, | |
242 | struct pt_regs *regs) | |
243 | { | |
244 | sigset_t saveset; | |
245 | ||
246 | mask &= _BLOCKABLE; | |
247 | spin_lock_irq(¤t->sighand->siglock); | |
248 | saveset = current->blocked; | |
249 | siginitset(¤t->blocked, mask); | |
250 | recalc_sigpending(); | |
251 | spin_unlock_irq(¤t->sighand->siglock); | |
252 | ||
253 | regs->result = -EINTR; | |
254 | regs->gpr[3] = EINTR; | |
255 | regs->ccr |= 0x10000000; | |
256 | while (1) { | |
257 | current->state = TASK_INTERRUPTIBLE; | |
258 | schedule(); | |
259 | if (do_signal(&saveset, regs)) | |
260 | sigreturn_exit(regs); | |
261 | } | |
262 | } | |
263 | ||
264 | long sys_rt_sigsuspend( | |
265 | #ifdef CONFIG_PPC64 | |
266 | compat_sigset_t __user *unewset, | |
267 | #else | |
268 | sigset_t __user *unewset, | |
269 | #endif | |
270 | size_t sigsetsize, int p3, int p4, | |
271 | int p6, int p7, struct pt_regs *regs) | |
272 | { | |
273 | sigset_t saveset, newset; | |
274 | ||
275 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
276 | if (sigsetsize != sizeof(sigset_t)) | |
277 | return -EINVAL; | |
278 | ||
279 | if (get_sigset_t(&newset, unewset)) | |
280 | return -EFAULT; | |
281 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
282 | ||
283 | spin_lock_irq(¤t->sighand->siglock); | |
284 | saveset = current->blocked; | |
285 | current->blocked = newset; | |
286 | recalc_sigpending(); | |
287 | spin_unlock_irq(¤t->sighand->siglock); | |
288 | ||
289 | regs->result = -EINTR; | |
290 | regs->gpr[3] = EINTR; | |
291 | regs->ccr |= 0x10000000; | |
292 | while (1) { | |
293 | current->state = TASK_INTERRUPTIBLE; | |
294 | schedule(); | |
295 | if (do_signal(&saveset, regs)) | |
296 | sigreturn_exit(regs); | |
297 | } | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_PPC32 | |
301 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, | |
302 | int r6, int r7, int r8, struct pt_regs *regs) | |
303 | { | |
304 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
305 | } | |
306 | #endif | |
307 | ||
308 | long sys_sigaction(int sig, struct old_sigaction __user *act, | |
309 | struct old_sigaction __user *oact) | |
310 | { | |
311 | struct k_sigaction new_ka, old_ka; | |
312 | int ret; | |
313 | ||
314 | #ifdef CONFIG_PPC64 | |
315 | if (sig < 0) | |
316 | sig = -sig; | |
317 | #endif | |
318 | ||
319 | if (act) { | |
320 | if (get_old_sigaction(&new_ka, act)) | |
321 | return -EFAULT; | |
322 | } | |
323 | ||
324 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
325 | if (!ret && oact) { | |
326 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
327 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
328 | &oact->sa_handler) || | |
329 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
330 | &oact->sa_restorer) || | |
331 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
332 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
333 | return -EFAULT; | |
334 | } | |
335 | ||
336 | return ret; | |
337 | } | |
1da177e4 LT |
338 | |
339 | /* | |
340 | * When we have signals to deliver, we set up on the | |
341 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
342 | * a sigregs struct |
343 | * a sigcontext struct | |
344 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
345 | * |
346 | * Each of these things must be a multiple of 16 bytes in size. | |
347 | * | |
348 | */ | |
81e7009e SR |
349 | struct sigregs { |
350 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
351 | /* |
352 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
353 | * regs and 18 fp regs below sp before decrementing it. | |
354 | */ | |
355 | int abigap[56]; | |
356 | }; | |
357 | ||
358 | /* We use the mc_pad field for the signal return trampoline. */ | |
359 | #define tramp mc_pad | |
360 | ||
361 | /* | |
362 | * When we have rt signals to deliver, we set up on the | |
363 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
364 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
365 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
366 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
367 | * positions as in older kernels). |
368 | * | |
369 | * Each of these things must be a multiple of 16 bytes in size. | |
370 | * | |
371 | */ | |
81e7009e SR |
372 | struct rt_sigframe { |
373 | #ifdef CONFIG_PPC64 | |
374 | compat_siginfo_t info; | |
375 | #else | |
376 | struct siginfo info; | |
377 | #endif | |
378 | struct ucontext uc; | |
1da177e4 LT |
379 | /* |
380 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
381 | * regs and 18 fp regs below sp before decrementing it. | |
382 | */ | |
383 | int abigap[56]; | |
384 | }; | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * Save the current user registers on the user stack. | |
81e7009e SR |
388 | * We only save the altivec/spe registers if the process has used |
389 | * altivec/spe instructions at some point. | |
1da177e4 | 390 | */ |
81e7009e SR |
391 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
392 | int sigret) | |
1da177e4 | 393 | { |
81e7009e SR |
394 | #ifdef CONFIG_PPC32 |
395 | CHECK_FULL_REGS(regs); | |
396 | #endif | |
1da177e4 LT |
397 | /* Make sure floating point registers are stored in regs */ |
398 | flush_fp_to_thread(current); | |
399 | ||
400 | /* save general and floating-point registers */ | |
81e7009e SR |
401 | if (save_general_regs(regs, frame) || |
402 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
403 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
404 | return 1; |
405 | ||
1da177e4 LT |
406 | #ifdef CONFIG_ALTIVEC |
407 | /* save altivec registers */ | |
408 | if (current->thread.used_vr) { | |
409 | flush_altivec_to_thread(current); | |
410 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 411 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
412 | return 1; |
413 | /* set MSR_VEC in the saved MSR value to indicate that | |
414 | frame->mc_vregs contains valid data */ | |
415 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
416 | return 1; | |
417 | } | |
418 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
419 | ||
420 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
421 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
422 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
423 | * most significant bits of that same vector. --BenH | |
424 | */ | |
425 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
426 | return 1; | |
427 | #endif /* CONFIG_ALTIVEC */ | |
428 | ||
81e7009e SR |
429 | #ifdef CONFIG_SPE |
430 | /* save spe registers */ | |
431 | if (current->thread.used_spe) { | |
432 | flush_spe_to_thread(current); | |
433 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
434 | ELF_NEVRREG * sizeof(u32))) | |
435 | return 1; | |
436 | /* set MSR_SPE in the saved MSR value to indicate that | |
437 | frame->mc_vregs contains valid data */ | |
438 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
439 | return 1; | |
440 | } | |
441 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
442 | ||
443 | /* We always copy to/from spefscr */ | |
444 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
445 | return 1; | |
446 | #endif /* CONFIG_SPE */ | |
447 | ||
1da177e4 LT |
448 | if (sigret) { |
449 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
450 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
451 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
452 | return 1; | |
453 | flush_icache_range((unsigned long) &frame->tramp[0], | |
454 | (unsigned long) &frame->tramp[2]); | |
455 | } | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Restore the current user register values from the user stack, | |
462 | * (except for MSR). | |
463 | */ | |
464 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 465 | struct mcontext __user *sr, int sig) |
1da177e4 | 466 | { |
81e7009e | 467 | long err; |
1da177e4 | 468 | unsigned int save_r2 = 0; |
81e7009e | 469 | #if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE) |
1da177e4 LT |
470 | unsigned long msr; |
471 | #endif | |
472 | ||
473 | /* | |
474 | * restore general registers but not including MSR or SOFTE. Also | |
475 | * take care of keeping r2 (TLS) intact if not a signal | |
476 | */ | |
477 | if (!sig) | |
478 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 479 | err = restore_general_regs(regs, sr); |
1da177e4 LT |
480 | if (!sig) |
481 | regs->gpr[2] = (unsigned long) save_r2; | |
482 | if (err) | |
483 | return 1; | |
484 | ||
485 | /* force the process to reload the FP registers from | |
486 | current->thread when it next does FP instructions */ | |
487 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
488 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
489 | sizeof(sr->mc_fregs))) | |
490 | return 1; | |
491 | ||
492 | #ifdef CONFIG_ALTIVEC | |
493 | /* force the process to reload the altivec registers from | |
494 | current->thread when it next does altivec instructions */ | |
495 | regs->msr &= ~MSR_VEC; | |
496 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { | |
497 | /* restore altivec registers from the stack */ | |
498 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
499 | sizeof(sr->mc_vregs))) | |
500 | return 1; | |
501 | } else if (current->thread.used_vr) | |
81e7009e | 502 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
503 | |
504 | /* Always get VRSAVE back */ | |
505 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
506 | return 1; | |
507 | #endif /* CONFIG_ALTIVEC */ | |
508 | ||
81e7009e SR |
509 | #ifdef CONFIG_SPE |
510 | /* force the process to reload the spe registers from | |
511 | current->thread when it next does spe instructions */ | |
512 | regs->msr &= ~MSR_SPE; | |
513 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) { | |
514 | /* restore spe registers from the stack */ | |
515 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
516 | ELF_NEVRREG * sizeof(u32))) | |
517 | return 1; | |
518 | } else if (current->thread.used_spe) | |
519 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
520 | ||
521 | /* Always get SPEFSCR back */ | |
522 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
523 | return 1; | |
524 | #endif /* CONFIG_SPE */ | |
525 | ||
1da177e4 LT |
526 | #ifndef CONFIG_SMP |
527 | preempt_disable(); | |
528 | if (last_task_used_math == current) | |
529 | last_task_used_math = NULL; | |
530 | if (last_task_used_altivec == current) | |
531 | last_task_used_altivec = NULL; | |
81e7009e SR |
532 | #ifdef CONFIG_SPE |
533 | if (last_task_used_spe == current) | |
534 | last_task_used_spe = NULL; | |
535 | #endif | |
1da177e4 LT |
536 | preempt_enable(); |
537 | #endif | |
538 | return 0; | |
539 | } | |
540 | ||
81e7009e | 541 | #ifdef CONFIG_PPC64 |
b09a4913 | 542 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
543 | struct sigaction32 __user *oact, size_t sigsetsize) |
544 | { | |
545 | struct k_sigaction new_ka, old_ka; | |
546 | int ret; | |
1da177e4 LT |
547 | |
548 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
549 | if (sigsetsize != sizeof(compat_sigset_t)) | |
550 | return -EINVAL; | |
551 | ||
552 | if (act) { | |
553 | compat_uptr_t handler; | |
554 | ||
555 | ret = get_user(handler, &act->sa_handler); | |
556 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 557 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
558 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
559 | if (ret) | |
560 | return -EFAULT; | |
561 | } | |
562 | ||
563 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
564 | if (!ret && oact) { | |
1da177e4 | 565 | ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler); |
81e7009e | 566 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
567 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
568 | } | |
569 | return ret; | |
570 | } | |
571 | ||
572 | /* | |
573 | * Note: it is necessary to treat how as an unsigned int, with the | |
574 | * corresponding cast to a signed int to insure that the proper | |
575 | * conversion (sign extension) between the register representation | |
576 | * of a signed int (msr in 32-bit mode) and the register representation | |
577 | * of a signed int (msr in 64-bit mode) is performed. | |
578 | */ | |
b09a4913 | 579 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
580 | compat_sigset_t __user *oset, size_t sigsetsize) |
581 | { | |
582 | sigset_t s; | |
583 | sigset_t __user *up; | |
1da177e4 LT |
584 | int ret; |
585 | mm_segment_t old_fs = get_fs(); | |
586 | ||
587 | if (set) { | |
81e7009e SR |
588 | if (get_sigset_t(&s, set)) |
589 | return -EFAULT; | |
1da177e4 | 590 | } |
81e7009e | 591 | |
1da177e4 LT |
592 | set_fs(KERNEL_DS); |
593 | /* This is valid because of the set_fs() */ | |
594 | up = (sigset_t __user *) &s; | |
595 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 596 | sigsetsize); |
1da177e4 LT |
597 | set_fs(old_fs); |
598 | if (ret) | |
599 | return ret; | |
600 | if (oset) { | |
81e7009e | 601 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
602 | return -EFAULT; |
603 | } | |
604 | return 0; | |
605 | } | |
606 | ||
b09a4913 | 607 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
608 | { |
609 | sigset_t s; | |
1da177e4 LT |
610 | int ret; |
611 | mm_segment_t old_fs = get_fs(); | |
612 | ||
613 | set_fs(KERNEL_DS); | |
614 | /* The __user pointer cast is valid because of the set_fs() */ | |
615 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
616 | set_fs(old_fs); | |
617 | if (!ret) { | |
81e7009e | 618 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
619 | return -EFAULT; |
620 | } | |
621 | return ret; | |
622 | } | |
623 | ||
624 | ||
625 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
626 | { | |
627 | int err; | |
628 | ||
629 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
630 | return -EFAULT; | |
631 | ||
632 | /* If you change siginfo_t structure, please be sure | |
633 | * this code is fixed accordingly. | |
634 | * It should never copy any pad contained in the structure | |
635 | * to avoid security leaks, but must copy the generic | |
636 | * 3 ints plus the relevant union member. | |
637 | * This routine must convert siginfo from 64bit to 32bit as well | |
638 | * at the same time. | |
639 | */ | |
640 | err = __put_user(s->si_signo, &d->si_signo); | |
641 | err |= __put_user(s->si_errno, &d->si_errno); | |
642 | err |= __put_user((short)s->si_code, &d->si_code); | |
643 | if (s->si_code < 0) | |
644 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
645 | SI_PAD_SIZE32); | |
646 | else switch(s->si_code >> 16) { | |
647 | case __SI_CHLD >> 16: | |
648 | err |= __put_user(s->si_pid, &d->si_pid); | |
649 | err |= __put_user(s->si_uid, &d->si_uid); | |
650 | err |= __put_user(s->si_utime, &d->si_utime); | |
651 | err |= __put_user(s->si_stime, &d->si_stime); | |
652 | err |= __put_user(s->si_status, &d->si_status); | |
653 | break; | |
654 | case __SI_FAULT >> 16: | |
655 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
656 | &d->si_addr); | |
657 | break; | |
658 | case __SI_POLL >> 16: | |
659 | err |= __put_user(s->si_band, &d->si_band); | |
660 | err |= __put_user(s->si_fd, &d->si_fd); | |
661 | break; | |
662 | case __SI_TIMER >> 16: | |
663 | err |= __put_user(s->si_tid, &d->si_tid); | |
664 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
665 | err |= __put_user(s->si_int, &d->si_int); | |
666 | break; | |
667 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
668 | case __SI_MESGQ >> 16: | |
669 | err |= __put_user(s->si_int, &d->si_int); | |
670 | /* fallthrough */ | |
671 | case __SI_KILL >> 16: | |
672 | default: | |
673 | err |= __put_user(s->si_pid, &d->si_pid); | |
674 | err |= __put_user(s->si_uid, &d->si_uid); | |
675 | break; | |
676 | } | |
677 | return err; | |
678 | } | |
679 | ||
81e7009e SR |
680 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
681 | ||
1da177e4 LT |
682 | /* |
683 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
684 | * corresponding cast to a signed int to insure that the proper conversion | |
685 | * (sign extension) between the register representation of a signed int | |
686 | * (msr in 32-bit mode) and the register representation of a signed int | |
687 | * (msr in 64-bit mode) is performed. | |
688 | */ | |
b09a4913 | 689 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
690 | { |
691 | siginfo_t info; | |
692 | int ret; | |
693 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 694 | |
1da177e4 LT |
695 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
696 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
697 | return -EFAULT; | |
698 | set_fs (KERNEL_DS); | |
699 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
700 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
701 | set_fs (old_fs); | |
702 | return ret; | |
703 | } | |
1da177e4 LT |
704 | /* |
705 | * Start Alternate signal stack support | |
706 | * | |
707 | * System Calls | |
b09a4913 | 708 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
709 | */ |
710 | ||
b09a4913 | 711 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
712 | int r6, int r7, int r8, struct pt_regs *regs) |
713 | { | |
714 | stack_32_t __user * newstack = (stack_32_t __user *)(long) __new; | |
715 | stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old; | |
716 | stack_t uss, uoss; | |
717 | int ret; | |
718 | mm_segment_t old_fs; | |
719 | unsigned long sp; | |
720 | compat_uptr_t ss_sp; | |
721 | ||
722 | /* | |
723 | * set sp to the user stack on entry to the system call | |
724 | * the system call router sets R9 to the saved registers | |
725 | */ | |
726 | sp = regs->gpr[1]; | |
727 | ||
728 | /* Put new stack info in local 64 bit stack struct */ | |
729 | if (newstack) { | |
730 | if (get_user(ss_sp, &newstack->ss_sp) || | |
731 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
732 | __get_user(uss.ss_size, &newstack->ss_size)) | |
733 | return -EFAULT; | |
734 | uss.ss_sp = compat_ptr(ss_sp); | |
735 | } | |
736 | ||
737 | old_fs = get_fs(); | |
738 | set_fs(KERNEL_DS); | |
739 | /* The __user pointer casts are valid because of the set_fs() */ | |
740 | ret = do_sigaltstack( | |
741 | newstack ? (stack_t __user *) &uss : NULL, | |
742 | oldstack ? (stack_t __user *) &uoss : NULL, | |
743 | sp); | |
744 | set_fs(old_fs); | |
745 | /* Copy the stack information to the user output buffer */ | |
746 | if (!ret && oldstack && | |
747 | (put_user((long)uoss.ss_sp, &oldstack->ss_sp) || | |
748 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || | |
749 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
750 | return -EFAULT; | |
751 | return ret; | |
752 | } | |
81e7009e | 753 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
754 | |
755 | ||
81e7009e SR |
756 | /* |
757 | * Restore the user process's signal mask | |
758 | */ | |
759 | #ifdef CONFIG_PPC64 | |
760 | extern void restore_sigmask(sigset_t *set); | |
761 | #else /* CONFIG_PPC64 */ | |
762 | static void restore_sigmask(sigset_t *set) | |
763 | { | |
764 | sigdelsetmask(set, ~_BLOCKABLE); | |
765 | spin_lock_irq(¤t->sighand->siglock); | |
766 | current->blocked = *set; | |
767 | recalc_sigpending(); | |
768 | spin_unlock_irq(¤t->sighand->siglock); | |
769 | } | |
770 | #endif | |
771 | ||
1da177e4 LT |
772 | /* |
773 | * Set up a signal frame for a "real-time" signal handler | |
774 | * (one which gets siginfo). | |
775 | */ | |
81e7009e SR |
776 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
777 | siginfo_t *info, sigset_t *oldset, | |
778 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 779 | { |
81e7009e SR |
780 | struct rt_sigframe __user *rt_sf; |
781 | struct mcontext __user *frame; | |
1da177e4 | 782 | unsigned long origsp = newsp; |
1da177e4 LT |
783 | |
784 | /* Set up Signal Frame */ | |
785 | /* Put a Real Time Context onto stack */ | |
786 | newsp -= sizeof(*rt_sf); | |
81e7009e | 787 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
788 | |
789 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 790 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
791 | |
792 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
793 | goto badframe; | |
794 | ||
1da177e4 | 795 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 796 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
797 | || __put_user(0, &rt_sf->uc.uc_flags) |
798 | || __put_user(0, &rt_sf->uc.uc_link) | |
799 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
800 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
801 | &rt_sf->uc.uc_stack.ss_flags) | |
802 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
803 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
804 | &rt_sf->uc.uc_regs) | |
805 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
806 | goto badframe; |
807 | ||
808 | /* Save user registers on the stack */ | |
809 | frame = &rt_sf->uc.uc_mcontext; | |
1da177e4 LT |
810 | if (vdso32_rt_sigtramp && current->thread.vdso_base) { |
811 | if (save_user_regs(regs, frame, 0)) | |
812 | goto badframe; | |
813 | regs->link = current->thread.vdso_base + vdso32_rt_sigtramp; | |
a7f290da | 814 | } else { |
1da177e4 LT |
815 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
816 | goto badframe; | |
817 | regs->link = (unsigned long) frame->tramp; | |
818 | } | |
cc657f53 PM |
819 | |
820 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
821 | ||
e2b55306 | 822 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
823 | goto badframe; |
824 | regs->gpr[1] = newsp; | |
1da177e4 LT |
825 | regs->gpr[3] = sig; |
826 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
827 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
828 | regs->gpr[6] = (unsigned long) rt_sf; | |
829 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
830 | regs->trap = 0; | |
81e7009e | 831 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
832 | regs->result = 0; |
833 | ||
834 | if (test_thread_flag(TIF_SINGLESTEP)) | |
835 | ptrace_notify(SIGTRAP); | |
81e7009e | 836 | #endif |
1da177e4 LT |
837 | return 1; |
838 | ||
839 | badframe: | |
81e7009e | 840 | #ifdef DEBUG_SIG |
1da177e4 LT |
841 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
842 | regs, frame, newsp); | |
843 | #endif | |
844 | force_sigsegv(sig, current); | |
845 | return 0; | |
846 | } | |
847 | ||
81e7009e | 848 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 849 | { |
1da177e4 | 850 | sigset_t set; |
81e7009e SR |
851 | struct mcontext __user *mcp; |
852 | ||
853 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
854 | return -EFAULT; | |
855 | #ifdef CONFIG_PPC64 | |
856 | { | |
857 | u32 cmcp; | |
1da177e4 | 858 | |
81e7009e SR |
859 | if (__get_user(cmcp, &ucp->uc_regs)) |
860 | return -EFAULT; | |
861 | mcp = (struct mcontext __user *)(u64)cmcp; | |
862 | } | |
863 | #else | |
864 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 865 | return -EFAULT; |
81e7009e | 866 | #endif |
1da177e4 | 867 | restore_sigmask(&set); |
81e7009e | 868 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
869 | return -EFAULT; |
870 | ||
871 | return 0; | |
872 | } | |
873 | ||
81e7009e SR |
874 | long sys_swapcontext(struct ucontext __user *old_ctx, |
875 | struct ucontext __user *new_ctx, | |
1da177e4 LT |
876 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) |
877 | { | |
878 | unsigned char tmp; | |
1da177e4 LT |
879 | |
880 | /* Context size is for future use. Right now, we only make sure | |
881 | * we are passed something we understand | |
882 | */ | |
81e7009e | 883 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
884 | return -EINVAL; |
885 | ||
886 | if (old_ctx != NULL) { | |
1da177e4 LT |
887 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
888 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) | |
81e7009e SR |
889 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
890 | || __put_user(to_user_ptr(&old_ctx->uc_mcontext), | |
891 | &old_ctx->uc_regs)) | |
1da177e4 LT |
892 | return -EFAULT; |
893 | } | |
894 | if (new_ctx == NULL) | |
895 | return 0; | |
896 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
897 | || __get_user(tmp, (u8 __user *) new_ctx) | |
898 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
899 | return -EFAULT; | |
900 | ||
901 | /* | |
902 | * If we get a fault copying the context into the kernel's | |
903 | * image of the user's registers, we can't just return -EFAULT | |
904 | * because the user's registers will be corrupted. For instance | |
905 | * the NIP value may have been updated but not some of the | |
906 | * other registers. Given that we have done the access_ok | |
907 | * and successfully read the first and last bytes of the region | |
908 | * above, this should only happen in an out-of-memory situation | |
909 | * or if another thread unmaps the region containing the context. | |
910 | * We kill the task with a SIGSEGV in this situation. | |
911 | */ | |
81e7009e | 912 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 913 | do_exit(SIGSEGV); |
81e7009e SR |
914 | sigreturn_exit(regs); |
915 | /* doesn't actually return back to here */ | |
1da177e4 LT |
916 | return 0; |
917 | } | |
918 | ||
81e7009e | 919 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
920 | struct pt_regs *regs) |
921 | { | |
81e7009e | 922 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
923 | |
924 | /* Always make any pending restarted system calls return -EINTR */ | |
925 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
926 | ||
81e7009e SR |
927 | rt_sf = (struct rt_sigframe __user *) |
928 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
929 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
930 | goto bad; | |
81e7009e | 931 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
932 | goto bad; |
933 | ||
934 | /* | |
935 | * It's not clear whether or why it is desirable to save the | |
936 | * sigaltstack setting on signal delivery and restore it on | |
937 | * signal return. But other architectures do this and we have | |
938 | * always done it up until now so it is probably better not to | |
939 | * change it. -- paulus | |
81e7009e SR |
940 | */ |
941 | #ifdef CONFIG_PPC64 | |
942 | /* | |
b09a4913 | 943 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
944 | * and takes userland pointer directly. What about error checking ? |
945 | * nobody does any... | |
946 | */ | |
b09a4913 | 947 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
948 | return (int)regs->result; |
949 | #else | |
950 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
951 | sigreturn_exit(regs); /* doesn't return here */ | |
952 | return 0; | |
953 | #endif | |
1da177e4 LT |
954 | |
955 | bad: | |
956 | force_sig(SIGSEGV, current); | |
957 | return 0; | |
958 | } | |
959 | ||
81e7009e SR |
960 | #ifdef CONFIG_PPC32 |
961 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
962 | int ndbg, struct sig_dbg_op __user *dbg, | |
963 | int r6, int r7, int r8, | |
964 | struct pt_regs *regs) | |
965 | { | |
966 | struct sig_dbg_op op; | |
967 | int i; | |
968 | unsigned long new_msr = regs->msr; | |
969 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
970 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
971 | #endif | |
972 | ||
973 | for (i=0; i<ndbg; i++) { | |
974 | if (__copy_from_user(&op, dbg, sizeof(op))) | |
975 | return -EFAULT; | |
976 | switch (op.dbg_type) { | |
977 | case SIG_DBG_SINGLE_STEPPING: | |
978 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
979 | if (op.dbg_value) { | |
980 | new_msr |= MSR_DE; | |
981 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
982 | } else { | |
983 | new_msr &= ~MSR_DE; | |
984 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
985 | } | |
986 | #else | |
987 | if (op.dbg_value) | |
988 | new_msr |= MSR_SE; | |
989 | else | |
990 | new_msr &= ~MSR_SE; | |
991 | #endif | |
992 | break; | |
993 | case SIG_DBG_BRANCH_TRACING: | |
994 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
995 | return -EINVAL; | |
996 | #else | |
997 | if (op.dbg_value) | |
998 | new_msr |= MSR_BE; | |
999 | else | |
1000 | new_msr &= ~MSR_BE; | |
1001 | #endif | |
1002 | break; | |
1003 | ||
1004 | default: | |
1005 | return -EINVAL; | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | /* We wait until here to actually install the values in the | |
1010 | registers so if we fail in the above loop, it will not | |
1011 | affect the contents of these registers. After this point, | |
1012 | failure is a problem, anyway, and it's very unlikely unless | |
1013 | the user is really doing something wrong. */ | |
1014 | regs->msr = new_msr; | |
1015 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1016 | current->thread.dbcr0 = new_dbcr0; | |
1017 | #endif | |
1018 | ||
1019 | /* | |
1020 | * If we get a fault copying the context into the kernel's | |
1021 | * image of the user's registers, we can't just return -EFAULT | |
1022 | * because the user's registers will be corrupted. For instance | |
1023 | * the NIP value may have been updated but not some of the | |
1024 | * other registers. Given that we have done the access_ok | |
1025 | * and successfully read the first and last bytes of the region | |
1026 | * above, this should only happen in an out-of-memory situation | |
1027 | * or if another thread unmaps the region containing the context. | |
1028 | * We kill the task with a SIGSEGV in this situation. | |
1029 | */ | |
1030 | if (do_setcontext(ctx, regs, 1)) { | |
1031 | force_sig(SIGSEGV, current); | |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * It's not clear whether or why it is desirable to save the | |
1037 | * sigaltstack setting on signal delivery and restore it on | |
1038 | * signal return. But other architectures do this and we have | |
1039 | * always done it up until now so it is probably better not to | |
1040 | * change it. -- paulus | |
1041 | */ | |
1042 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1043 | ||
1044 | sigreturn_exit(regs); | |
1045 | /* doesn't actually return back to here */ | |
1046 | ||
1047 | out: | |
1048 | return 0; | |
1049 | } | |
1050 | #endif | |
1da177e4 LT |
1051 | |
1052 | /* | |
1053 | * OK, we're invoking a handler | |
1054 | */ | |
81e7009e SR |
1055 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
1056 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
1057 | unsigned long newsp) | |
1da177e4 | 1058 | { |
81e7009e SR |
1059 | struct sigcontext __user *sc; |
1060 | struct sigregs __user *frame; | |
1da177e4 LT |
1061 | unsigned long origsp = newsp; |
1062 | ||
1063 | /* Set up Signal Frame */ | |
81e7009e SR |
1064 | newsp -= sizeof(struct sigregs); |
1065 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1066 | |
1067 | /* Put a sigcontext on the stack */ | |
1068 | newsp -= sizeof(*sc); | |
81e7009e | 1069 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1070 | |
1071 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1072 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1073 | |
1074 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1075 | goto badframe; | |
1076 | ||
1077 | #if _NSIG != 64 | |
81e7009e | 1078 | #error "Please adjust handle_signal()" |
1da177e4 | 1079 | #endif |
81e7009e | 1080 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1081 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1082 | #ifdef CONFIG_PPC64 |
1da177e4 | 1083 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1084 | #else |
1085 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1086 | #endif | |
1087 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1088 | || __put_user(sig, &sc->signal)) |
1089 | goto badframe; | |
1090 | ||
1091 | if (vdso32_sigtramp && current->thread.vdso_base) { | |
1092 | if (save_user_regs(regs, &frame->mctx, 0)) | |
1093 | goto badframe; | |
1094 | regs->link = current->thread.vdso_base + vdso32_sigtramp; | |
a7f290da | 1095 | } else { |
1da177e4 LT |
1096 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1097 | goto badframe; | |
1098 | regs->link = (unsigned long) frame->mctx.tramp; | |
1099 | } | |
1100 | ||
cc657f53 PM |
1101 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1102 | ||
9747dd6f | 1103 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1104 | goto badframe; |
81e7009e | 1105 | regs->gpr[1] = newsp; |
1da177e4 LT |
1106 | regs->gpr[3] = sig; |
1107 | regs->gpr[4] = (unsigned long) sc; | |
1108 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
1109 | regs->trap = 0; | |
81e7009e | 1110 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1111 | regs->result = 0; |
1112 | ||
1113 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1114 | ptrace_notify(SIGTRAP); | |
81e7009e | 1115 | #endif |
1da177e4 LT |
1116 | |
1117 | return 1; | |
1118 | ||
1119 | badframe: | |
81e7009e SR |
1120 | #ifdef DEBUG_SIG |
1121 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1122 | regs, frame, newsp); | |
1da177e4 LT |
1123 | #endif |
1124 | force_sigsegv(sig, current); | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Do a signal return; undo the signal stack. | |
1130 | */ | |
81e7009e | 1131 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1132 | struct pt_regs *regs) |
1133 | { | |
81e7009e SR |
1134 | struct sigcontext __user *sc; |
1135 | struct sigcontext sigctx; | |
1136 | struct mcontext __user *sr; | |
1da177e4 | 1137 | sigset_t set; |
1da177e4 LT |
1138 | |
1139 | /* Always make any pending restarted system calls return -EINTR */ | |
1140 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1141 | ||
81e7009e | 1142 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1143 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1144 | goto badframe; | |
1145 | ||
81e7009e | 1146 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1147 | /* |
1148 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1149 | * unused part of the signal stackframe | |
1150 | */ | |
1151 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1152 | #else |
1153 | set.sig[0] = sigctx.oldmask; | |
1154 | set.sig[1] = sigctx._unused[3]; | |
1155 | #endif | |
1da177e4 LT |
1156 | restore_sigmask(&set); |
1157 | ||
81e7009e | 1158 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
1da177e4 LT |
1159 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1160 | || restore_user_regs(regs, sr, 1)) | |
1161 | goto badframe; | |
1162 | ||
81e7009e SR |
1163 | #ifdef CONFIG_PPC64 |
1164 | return (int)regs->result; | |
1165 | #else | |
1166 | sigreturn_exit(regs); /* doesn't return */ | |
1167 | return 0; | |
1168 | #endif | |
1da177e4 LT |
1169 | |
1170 | badframe: | |
1171 | force_sig(SIGSEGV, current); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1da177e4 LT |
1175 | /* |
1176 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1177 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1178 | * mistake. | |
1179 | */ | |
81e7009e | 1180 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
1da177e4 LT |
1181 | { |
1182 | siginfo_t info; | |
81e7009e | 1183 | struct k_sigaction ka; |
1da177e4 LT |
1184 | unsigned int frame, newsp; |
1185 | int signr, ret; | |
81e7009e SR |
1186 | |
1187 | #ifdef CONFIG_PPC32 | |
1188 | if (try_to_freeze()) { | |
1189 | signr = 0; | |
1190 | if (!signal_pending(current)) | |
1191 | goto no_signal; | |
1192 | } | |
1193 | #endif | |
1da177e4 LT |
1194 | |
1195 | if (!oldset) | |
1196 | oldset = ¤t->blocked; | |
1197 | ||
1198 | newsp = frame = 0; | |
1199 | ||
1200 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
81e7009e SR |
1201 | #ifdef CONFIG_PPC32 |
1202 | no_signal: | |
1203 | #endif | |
1da177e4 LT |
1204 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
1205 | && regs->ccr & 0x10000000 /* error signalled */ | |
1206 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
1207 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
1208 | || ret == ERESTART_RESTARTBLOCK)) { | |
1209 | ||
1210 | if (signr > 0 | |
1211 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
1212 | || (ret == ERESTARTSYS | |
1213 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
1214 | /* make the system call return an EINTR error */ | |
1215 | regs->result = -EINTR; | |
1216 | regs->gpr[3] = EINTR; | |
1217 | /* note that the cr0.SO bit is already set */ | |
1218 | } else { | |
1219 | regs->nip -= 4; /* Back up & retry system call */ | |
1220 | regs->result = 0; | |
1221 | regs->trap = 0; | |
1222 | if (ret == ERESTART_RESTARTBLOCK) | |
1223 | regs->gpr[0] = __NR_restart_syscall; | |
1224 | else | |
1225 | regs->gpr[3] = regs->orig_gpr3; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | if (signr == 0) | |
1230 | return 0; /* no signals delivered */ | |
1231 | ||
1232 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
81e7009e SR |
1233 | && !on_sig_stack(regs->gpr[1])) |
1234 | newsp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
1235 | else |
1236 | newsp = regs->gpr[1]; | |
1237 | newsp &= ~0xfUL; | |
1238 | ||
81e7009e | 1239 | #ifdef CONFIG_PPC64 |
fd9648df AB |
1240 | /* |
1241 | * Reenable the DABR before delivering the signal to | |
1242 | * user space. The DABR will have been cleared if it | |
1243 | * triggered inside the kernel. | |
1244 | */ | |
1245 | if (current->thread.dabr) | |
1246 | set_dabr(current->thread.dabr); | |
81e7009e | 1247 | #endif |
fd9648df | 1248 | |
1da177e4 LT |
1249 | /* Whee! Actually deliver the signal. */ |
1250 | if (ka.sa.sa_flags & SA_SIGINFO) | |
81e7009e | 1251 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1252 | else |
81e7009e | 1253 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1254 | |
69be8f18 | 1255 | if (ret) { |
1da177e4 LT |
1256 | spin_lock_irq(¤t->sighand->siglock); |
1257 | sigorsets(¤t->blocked, ¤t->blocked, | |
1258 | &ka.sa.sa_mask); | |
69be8f18 SR |
1259 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
1260 | sigaddset(¤t->blocked, signr); | |
1da177e4 LT |
1261 | recalc_sigpending(); |
1262 | spin_unlock_irq(¤t->sighand->siglock); | |
1263 | } | |
1264 | ||
1265 | return ret; | |
1266 | } |