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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 | ||
1da177e4 | 20 | #include <linux/sched.h> |
81e7009e | 21 | #include <linux/mm.h> |
1da177e4 LT |
22 | #include <linux/smp.h> |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/signal.h> | |
1da177e4 LT |
26 | #include <linux/errno.h> |
27 | #include <linux/elf.h> | |
81e7009e SR |
28 | #ifdef CONFIG_PPC64 |
29 | #include <linux/syscalls.h> | |
1da177e4 LT |
30 | #include <linux/compat.h> |
31 | #include <linux/ptrace.h> | |
81e7009e SR |
32 | #else |
33 | #include <linux/wait.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/unistd.h> | |
36 | #include <linux/stddef.h> | |
37 | #include <linux/tty.h> | |
38 | #include <linux/binfmts.h> | |
7dfb7103 | 39 | #include <linux/freezer.h> |
81e7009e SR |
40 | #endif |
41 | ||
1da177e4 | 42 | #include <asm/uaccess.h> |
81e7009e | 43 | #include <asm/cacheflush.h> |
a7f31841 | 44 | #include <asm/syscalls.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 | */ | |
81e7009e SR |
79 | |
80 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
81 | #undef __SIGNAL_FRAMESIZE | |
82 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
83 | #undef ELF_NVRREG | |
84 | #define ELF_NVRREG ELF_NVRREG32 | |
85 | ||
86 | /* | |
87 | * Functions for flipping sigsets (thanks to brain dead generic | |
88 | * implementation that makes things simple for little endian only) | |
89 | */ | |
90 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
91 | { | |
92 | compat_sigset_t cset; | |
93 | ||
94 | switch (_NSIG_WORDS) { | |
95 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
96 | cset.sig[7] = set->sig[3] >> 32; | |
97 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
98 | cset.sig[5] = set->sig[2] >> 32; | |
99 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
100 | cset.sig[3] = set->sig[1] >> 32; | |
101 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
102 | cset.sig[1] = set->sig[0] >> 32; | |
103 | } | |
104 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
105 | } | |
106 | ||
9b7cf8b4 PM |
107 | static inline int get_sigset_t(sigset_t *set, |
108 | const compat_sigset_t __user *uset) | |
81e7009e SR |
109 | { |
110 | compat_sigset_t s32; | |
111 | ||
112 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
113 | return -EFAULT; | |
114 | ||
115 | /* | |
116 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
117 | * in the "wrong" endian in 32-bit user storage). | |
118 | */ | |
119 | switch (_NSIG_WORDS) { | |
120 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
121 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
122 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
123 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
124 | } | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
129 | struct old_sigaction __user *act) | |
130 | { | |
131 | compat_old_sigset_t mask; | |
132 | compat_uptr_t handler, restorer; | |
133 | ||
134 | if (get_user(handler, &act->sa_handler) || | |
135 | __get_user(restorer, &act->sa_restorer) || | |
136 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
137 | __get_user(mask, &act->sa_mask)) | |
138 | return -EFAULT; | |
139 | new_ka->sa.sa_handler = compat_ptr(handler); | |
140 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
141 | siginitset(&new_ka->sa.sa_mask, mask); | |
142 | return 0; | |
143 | } | |
144 | ||
29e646df | 145 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
146 | #define from_user_ptr(p) compat_ptr(p) |
147 | ||
148 | static inline int save_general_regs(struct pt_regs *regs, | |
149 | struct mcontext __user *frame) | |
150 | { | |
151 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
152 | int i; | |
153 | ||
1bd79336 | 154 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
155 | |
156 | for (i = 0; i <= PT_RESULT; i ++) { | |
157 | if (i == 14 && !FULL_REGS(regs)) | |
158 | i = 32; | |
81e7009e SR |
159 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
160 | return -EFAULT; | |
401d1f02 | 161 | } |
81e7009e SR |
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 | ||
81e7009e SR |
182 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
183 | ||
184 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
185 | { | |
186 | return copy_to_user(uset, set, sizeof(*uset)); | |
187 | } | |
188 | ||
9b7cf8b4 | 189 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
190 | { |
191 | return copy_from_user(set, uset, sizeof(*uset)); | |
192 | } | |
193 | ||
194 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
195 | struct old_sigaction __user *act) | |
196 | { | |
197 | old_sigset_t mask; | |
198 | ||
199 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
200 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
201 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
202 | return -EFAULT; | |
203 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
204 | __get_user(mask, &act->sa_mask); | |
205 | siginitset(&new_ka->sa.sa_mask, mask); | |
206 | return 0; | |
207 | } | |
208 | ||
29e646df AV |
209 | #define to_user_ptr(p) ((unsigned long)(p)) |
210 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
211 | |
212 | static inline int save_general_regs(struct pt_regs *regs, | |
213 | struct mcontext __user *frame) | |
214 | { | |
1bd79336 | 215 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
216 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
217 | } | |
218 | ||
219 | static inline int restore_general_regs(struct pt_regs *regs, | |
220 | struct mcontext __user *sr) | |
221 | { | |
222 | /* copy up to but not including MSR */ | |
223 | if (__copy_from_user(regs, &sr->mc_gregs, | |
224 | PT_MSR * sizeof(elf_greg_t))) | |
225 | return -EFAULT; | |
226 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
227 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
228 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
229 | return -EFAULT; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | #endif /* CONFIG_PPC64 */ | |
234 | ||
235 | int do_signal(sigset_t *oldset, struct pt_regs *regs); | |
236 | ||
237 | /* | |
238 | * Atomically swap in the new signal mask, and wait for a signal. | |
239 | */ | |
150256d8 | 240 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 241 | { |
81e7009e SR |
242 | mask &= _BLOCKABLE; |
243 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 244 | current->saved_sigmask = current->blocked; |
81e7009e SR |
245 | siginitset(¤t->blocked, mask); |
246 | recalc_sigpending(); | |
247 | spin_unlock_irq(¤t->sighand->siglock); | |
248 | ||
150256d8 DW |
249 | current->state = TASK_INTERRUPTIBLE; |
250 | schedule(); | |
251 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
252 | return -ERESTARTNOHAND; | |
81e7009e SR |
253 | } |
254 | ||
255 | #ifdef CONFIG_PPC32 | |
256 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, | |
257 | int r6, int r7, int r8, struct pt_regs *regs) | |
258 | { | |
259 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
260 | } | |
261 | #endif | |
262 | ||
263 | long sys_sigaction(int sig, struct old_sigaction __user *act, | |
264 | struct old_sigaction __user *oact) | |
265 | { | |
266 | struct k_sigaction new_ka, old_ka; | |
267 | int ret; | |
268 | ||
269 | #ifdef CONFIG_PPC64 | |
270 | if (sig < 0) | |
271 | sig = -sig; | |
272 | #endif | |
273 | ||
274 | if (act) { | |
275 | if (get_old_sigaction(&new_ka, act)) | |
276 | return -EFAULT; | |
277 | } | |
278 | ||
279 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
280 | if (!ret && oact) { | |
281 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
282 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
283 | &oact->sa_handler) || | |
284 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
285 | &oact->sa_restorer) || | |
286 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
287 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
288 | return -EFAULT; | |
289 | } | |
290 | ||
291 | return ret; | |
292 | } | |
1da177e4 LT |
293 | |
294 | /* | |
295 | * When we have signals to deliver, we set up on the | |
296 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
297 | * a sigregs struct |
298 | * a sigcontext struct | |
299 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
300 | * |
301 | * Each of these things must be a multiple of 16 bytes in size. | |
302 | * | |
303 | */ | |
81e7009e SR |
304 | struct sigregs { |
305 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
306 | /* |
307 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
308 | * regs and 18 fp regs below sp before decrementing it. | |
309 | */ | |
310 | int abigap[56]; | |
311 | }; | |
312 | ||
313 | /* We use the mc_pad field for the signal return trampoline. */ | |
314 | #define tramp mc_pad | |
315 | ||
316 | /* | |
317 | * When we have rt signals to deliver, we set up on the | |
318 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
319 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
320 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
321 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
322 | * positions as in older kernels). |
323 | * | |
324 | * Each of these things must be a multiple of 16 bytes in size. | |
325 | * | |
326 | */ | |
81e7009e SR |
327 | struct rt_sigframe { |
328 | #ifdef CONFIG_PPC64 | |
329 | compat_siginfo_t info; | |
330 | #else | |
331 | struct siginfo info; | |
332 | #endif | |
333 | struct ucontext uc; | |
1da177e4 LT |
334 | /* |
335 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
336 | * regs and 18 fp regs below sp before decrementing it. | |
337 | */ | |
338 | int abigap[56]; | |
339 | }; | |
340 | ||
1da177e4 LT |
341 | /* |
342 | * Save the current user registers on the user stack. | |
81e7009e SR |
343 | * We only save the altivec/spe registers if the process has used |
344 | * altivec/spe instructions at some point. | |
1da177e4 | 345 | */ |
81e7009e SR |
346 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
347 | int sigret) | |
1da177e4 | 348 | { |
1da177e4 LT |
349 | /* Make sure floating point registers are stored in regs */ |
350 | flush_fp_to_thread(current); | |
351 | ||
352 | /* save general and floating-point registers */ | |
81e7009e SR |
353 | if (save_general_regs(regs, frame) || |
354 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
355 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
356 | return 1; |
357 | ||
1da177e4 LT |
358 | #ifdef CONFIG_ALTIVEC |
359 | /* save altivec registers */ | |
360 | if (current->thread.used_vr) { | |
361 | flush_altivec_to_thread(current); | |
362 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 363 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
364 | return 1; |
365 | /* set MSR_VEC in the saved MSR value to indicate that | |
366 | frame->mc_vregs contains valid data */ | |
367 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
368 | return 1; | |
369 | } | |
370 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
371 | ||
372 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
373 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
374 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
375 | * most significant bits of that same vector. --BenH | |
376 | */ | |
377 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
378 | return 1; | |
379 | #endif /* CONFIG_ALTIVEC */ | |
380 | ||
81e7009e SR |
381 | #ifdef CONFIG_SPE |
382 | /* save spe registers */ | |
383 | if (current->thread.used_spe) { | |
384 | flush_spe_to_thread(current); | |
385 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
386 | ELF_NEVRREG * sizeof(u32))) | |
387 | return 1; | |
388 | /* set MSR_SPE in the saved MSR value to indicate that | |
389 | frame->mc_vregs contains valid data */ | |
390 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
391 | return 1; | |
392 | } | |
393 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
394 | ||
395 | /* We always copy to/from spefscr */ | |
396 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
397 | return 1; | |
398 | #endif /* CONFIG_SPE */ | |
399 | ||
1da177e4 LT |
400 | if (sigret) { |
401 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
402 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
403 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
404 | return 1; | |
405 | flush_icache_range((unsigned long) &frame->tramp[0], | |
406 | (unsigned long) &frame->tramp[2]); | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Restore the current user register values from the user stack, | |
414 | * (except for MSR). | |
415 | */ | |
416 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 417 | struct mcontext __user *sr, int sig) |
1da177e4 | 418 | { |
81e7009e | 419 | long err; |
1da177e4 | 420 | unsigned int save_r2 = 0; |
1da177e4 | 421 | unsigned long msr; |
1da177e4 LT |
422 | |
423 | /* | |
424 | * restore general registers but not including MSR or SOFTE. Also | |
425 | * take care of keeping r2 (TLS) intact if not a signal | |
426 | */ | |
427 | if (!sig) | |
428 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 429 | err = restore_general_regs(regs, sr); |
fab5db97 | 430 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
431 | if (!sig) |
432 | regs->gpr[2] = (unsigned long) save_r2; | |
433 | if (err) | |
434 | return 1; | |
435 | ||
fab5db97 PM |
436 | /* if doing signal return, restore the previous little-endian mode */ |
437 | if (sig) | |
438 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
439 | ||
5388fb10 PM |
440 | /* |
441 | * Do this before updating the thread state in | |
442 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
443 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
444 | * tempted to save the current CPU state into the thread_struct | |
445 | * and corrupt what we are writing there. | |
446 | */ | |
447 | discard_lazy_cpu_state(); | |
448 | ||
1da177e4 LT |
449 | /* force the process to reload the FP registers from |
450 | current->thread when it next does FP instructions */ | |
451 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
452 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
453 | sizeof(sr->mc_fregs))) | |
454 | return 1; | |
455 | ||
456 | #ifdef CONFIG_ALTIVEC | |
457 | /* force the process to reload the altivec registers from | |
458 | current->thread when it next does altivec instructions */ | |
459 | regs->msr &= ~MSR_VEC; | |
fab5db97 | 460 | if (msr & MSR_VEC) { |
1da177e4 LT |
461 | /* restore altivec registers from the stack */ |
462 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
463 | sizeof(sr->mc_vregs))) | |
464 | return 1; | |
465 | } else if (current->thread.used_vr) | |
81e7009e | 466 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
467 | |
468 | /* Always get VRSAVE back */ | |
469 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
470 | return 1; | |
471 | #endif /* CONFIG_ALTIVEC */ | |
472 | ||
81e7009e SR |
473 | #ifdef CONFIG_SPE |
474 | /* force the process to reload the spe registers from | |
475 | current->thread when it next does spe instructions */ | |
476 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 477 | if (msr & MSR_SPE) { |
81e7009e SR |
478 | /* restore spe registers from the stack */ |
479 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
480 | ELF_NEVRREG * sizeof(u32))) | |
481 | return 1; | |
482 | } else if (current->thread.used_spe) | |
483 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
484 | ||
485 | /* Always get SPEFSCR back */ | |
486 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
487 | return 1; | |
488 | #endif /* CONFIG_SPE */ | |
489 | ||
1da177e4 LT |
490 | return 0; |
491 | } | |
492 | ||
81e7009e | 493 | #ifdef CONFIG_PPC64 |
b09a4913 | 494 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
495 | struct sigaction32 __user *oact, size_t sigsetsize) |
496 | { | |
497 | struct k_sigaction new_ka, old_ka; | |
498 | int ret; | |
1da177e4 LT |
499 | |
500 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
501 | if (sigsetsize != sizeof(compat_sigset_t)) | |
502 | return -EINVAL; | |
503 | ||
504 | if (act) { | |
505 | compat_uptr_t handler; | |
506 | ||
507 | ret = get_user(handler, &act->sa_handler); | |
508 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 509 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
510 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
511 | if (ret) | |
512 | return -EFAULT; | |
513 | } | |
514 | ||
515 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
516 | if (!ret && oact) { | |
29e646df | 517 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 518 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
519 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
520 | } | |
521 | return ret; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Note: it is necessary to treat how as an unsigned int, with the | |
526 | * corresponding cast to a signed int to insure that the proper | |
527 | * conversion (sign extension) between the register representation | |
528 | * of a signed int (msr in 32-bit mode) and the register representation | |
529 | * of a signed int (msr in 64-bit mode) is performed. | |
530 | */ | |
b09a4913 | 531 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
532 | compat_sigset_t __user *oset, size_t sigsetsize) |
533 | { | |
534 | sigset_t s; | |
535 | sigset_t __user *up; | |
1da177e4 LT |
536 | int ret; |
537 | mm_segment_t old_fs = get_fs(); | |
538 | ||
539 | if (set) { | |
81e7009e SR |
540 | if (get_sigset_t(&s, set)) |
541 | return -EFAULT; | |
1da177e4 | 542 | } |
81e7009e | 543 | |
1da177e4 LT |
544 | set_fs(KERNEL_DS); |
545 | /* This is valid because of the set_fs() */ | |
546 | up = (sigset_t __user *) &s; | |
547 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 548 | sigsetsize); |
1da177e4 LT |
549 | set_fs(old_fs); |
550 | if (ret) | |
551 | return ret; | |
552 | if (oset) { | |
81e7009e | 553 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
554 | return -EFAULT; |
555 | } | |
556 | return 0; | |
557 | } | |
558 | ||
b09a4913 | 559 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
560 | { |
561 | sigset_t s; | |
1da177e4 LT |
562 | int ret; |
563 | mm_segment_t old_fs = get_fs(); | |
564 | ||
565 | set_fs(KERNEL_DS); | |
566 | /* The __user pointer cast is valid because of the set_fs() */ | |
567 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
568 | set_fs(old_fs); | |
569 | if (!ret) { | |
81e7009e | 570 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
571 | return -EFAULT; |
572 | } | |
573 | return ret; | |
574 | } | |
575 | ||
576 | ||
577 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
578 | { | |
579 | int err; | |
580 | ||
581 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
582 | return -EFAULT; | |
583 | ||
584 | /* If you change siginfo_t structure, please be sure | |
585 | * this code is fixed accordingly. | |
586 | * It should never copy any pad contained in the structure | |
587 | * to avoid security leaks, but must copy the generic | |
588 | * 3 ints plus the relevant union member. | |
589 | * This routine must convert siginfo from 64bit to 32bit as well | |
590 | * at the same time. | |
591 | */ | |
592 | err = __put_user(s->si_signo, &d->si_signo); | |
593 | err |= __put_user(s->si_errno, &d->si_errno); | |
594 | err |= __put_user((short)s->si_code, &d->si_code); | |
595 | if (s->si_code < 0) | |
596 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
597 | SI_PAD_SIZE32); | |
598 | else switch(s->si_code >> 16) { | |
599 | case __SI_CHLD >> 16: | |
600 | err |= __put_user(s->si_pid, &d->si_pid); | |
601 | err |= __put_user(s->si_uid, &d->si_uid); | |
602 | err |= __put_user(s->si_utime, &d->si_utime); | |
603 | err |= __put_user(s->si_stime, &d->si_stime); | |
604 | err |= __put_user(s->si_status, &d->si_status); | |
605 | break; | |
606 | case __SI_FAULT >> 16: | |
607 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
608 | &d->si_addr); | |
609 | break; | |
610 | case __SI_POLL >> 16: | |
611 | err |= __put_user(s->si_band, &d->si_band); | |
612 | err |= __put_user(s->si_fd, &d->si_fd); | |
613 | break; | |
614 | case __SI_TIMER >> 16: | |
615 | err |= __put_user(s->si_tid, &d->si_tid); | |
616 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
617 | err |= __put_user(s->si_int, &d->si_int); | |
618 | break; | |
619 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
620 | case __SI_MESGQ >> 16: | |
621 | err |= __put_user(s->si_int, &d->si_int); | |
622 | /* fallthrough */ | |
623 | case __SI_KILL >> 16: | |
624 | default: | |
625 | err |= __put_user(s->si_pid, &d->si_pid); | |
626 | err |= __put_user(s->si_uid, &d->si_uid); | |
627 | break; | |
628 | } | |
629 | return err; | |
630 | } | |
631 | ||
81e7009e SR |
632 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
636 | * corresponding cast to a signed int to insure that the proper conversion | |
637 | * (sign extension) between the register representation of a signed int | |
638 | * (msr in 32-bit mode) and the register representation of a signed int | |
639 | * (msr in 64-bit mode) is performed. | |
640 | */ | |
b09a4913 | 641 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
642 | { |
643 | siginfo_t info; | |
644 | int ret; | |
645 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 646 | |
1da177e4 LT |
647 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
648 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
649 | return -EFAULT; | |
650 | set_fs (KERNEL_DS); | |
651 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
652 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
653 | set_fs (old_fs); | |
654 | return ret; | |
655 | } | |
1da177e4 LT |
656 | /* |
657 | * Start Alternate signal stack support | |
658 | * | |
659 | * System Calls | |
b09a4913 | 660 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
661 | */ |
662 | ||
b09a4913 | 663 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
664 | int r6, int r7, int r8, struct pt_regs *regs) |
665 | { | |
29e646df AV |
666 | stack_32_t __user * newstack = compat_ptr(__new); |
667 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
668 | stack_t uss, uoss; |
669 | int ret; | |
670 | mm_segment_t old_fs; | |
671 | unsigned long sp; | |
672 | compat_uptr_t ss_sp; | |
673 | ||
674 | /* | |
675 | * set sp to the user stack on entry to the system call | |
676 | * the system call router sets R9 to the saved registers | |
677 | */ | |
678 | sp = regs->gpr[1]; | |
679 | ||
680 | /* Put new stack info in local 64 bit stack struct */ | |
681 | if (newstack) { | |
682 | if (get_user(ss_sp, &newstack->ss_sp) || | |
683 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
684 | __get_user(uss.ss_size, &newstack->ss_size)) | |
685 | return -EFAULT; | |
686 | uss.ss_sp = compat_ptr(ss_sp); | |
687 | } | |
688 | ||
689 | old_fs = get_fs(); | |
690 | set_fs(KERNEL_DS); | |
691 | /* The __user pointer casts are valid because of the set_fs() */ | |
692 | ret = do_sigaltstack( | |
693 | newstack ? (stack_t __user *) &uss : NULL, | |
694 | oldstack ? (stack_t __user *) &uoss : NULL, | |
695 | sp); | |
696 | set_fs(old_fs); | |
697 | /* Copy the stack information to the user output buffer */ | |
698 | if (!ret && oldstack && | |
29e646df | 699 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
700 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
701 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
702 | return -EFAULT; | |
703 | return ret; | |
704 | } | |
81e7009e | 705 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
706 | |
707 | ||
81e7009e SR |
708 | /* |
709 | * Restore the user process's signal mask | |
710 | */ | |
711 | #ifdef CONFIG_PPC64 | |
712 | extern void restore_sigmask(sigset_t *set); | |
713 | #else /* CONFIG_PPC64 */ | |
714 | static void restore_sigmask(sigset_t *set) | |
715 | { | |
716 | sigdelsetmask(set, ~_BLOCKABLE); | |
717 | spin_lock_irq(¤t->sighand->siglock); | |
718 | current->blocked = *set; | |
719 | recalc_sigpending(); | |
720 | spin_unlock_irq(¤t->sighand->siglock); | |
721 | } | |
722 | #endif | |
723 | ||
1da177e4 LT |
724 | /* |
725 | * Set up a signal frame for a "real-time" signal handler | |
726 | * (one which gets siginfo). | |
727 | */ | |
81e7009e SR |
728 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
729 | siginfo_t *info, sigset_t *oldset, | |
730 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 731 | { |
81e7009e SR |
732 | struct rt_sigframe __user *rt_sf; |
733 | struct mcontext __user *frame; | |
1da177e4 | 734 | unsigned long origsp = newsp; |
1da177e4 LT |
735 | |
736 | /* Set up Signal Frame */ | |
737 | /* Put a Real Time Context onto stack */ | |
738 | newsp -= sizeof(*rt_sf); | |
81e7009e | 739 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
740 | |
741 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 742 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
743 | |
744 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
745 | goto badframe; | |
746 | ||
1da177e4 | 747 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 748 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
749 | || __put_user(0, &rt_sf->uc.uc_flags) |
750 | || __put_user(0, &rt_sf->uc.uc_link) | |
751 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
752 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
753 | &rt_sf->uc.uc_stack.ss_flags) | |
754 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
755 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
756 | &rt_sf->uc.uc_regs) | |
757 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
758 | goto badframe; |
759 | ||
760 | /* Save user registers on the stack */ | |
761 | frame = &rt_sf->uc.uc_mcontext; | |
a5bba930 | 762 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
763 | if (save_user_regs(regs, frame, 0)) |
764 | goto badframe; | |
a5bba930 | 765 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 766 | } else { |
1da177e4 LT |
767 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
768 | goto badframe; | |
769 | regs->link = (unsigned long) frame->tramp; | |
770 | } | |
cc657f53 PM |
771 | |
772 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
773 | ||
e2b55306 | 774 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
775 | goto badframe; |
776 | regs->gpr[1] = newsp; | |
1da177e4 LT |
777 | regs->gpr[3] = sig; |
778 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
779 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
780 | regs->gpr[6] = (unsigned long) rt_sf; | |
781 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
782 | /* enter the signal handler in big-endian mode */ |
783 | regs->msr &= ~MSR_LE; | |
1da177e4 | 784 | regs->trap = 0; |
1da177e4 LT |
785 | return 1; |
786 | ||
787 | badframe: | |
81e7009e | 788 | #ifdef DEBUG_SIG |
1da177e4 LT |
789 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
790 | regs, frame, newsp); | |
791 | #endif | |
792 | force_sigsegv(sig, current); | |
793 | return 0; | |
794 | } | |
795 | ||
81e7009e | 796 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 797 | { |
1da177e4 | 798 | sigset_t set; |
81e7009e SR |
799 | struct mcontext __user *mcp; |
800 | ||
801 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
802 | return -EFAULT; | |
803 | #ifdef CONFIG_PPC64 | |
804 | { | |
805 | u32 cmcp; | |
1da177e4 | 806 | |
81e7009e SR |
807 | if (__get_user(cmcp, &ucp->uc_regs)) |
808 | return -EFAULT; | |
809 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 810 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
811 | } |
812 | #else | |
813 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 814 | return -EFAULT; |
7c85d1f9 PM |
815 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
816 | return -EFAULT; | |
81e7009e | 817 | #endif |
1da177e4 | 818 | restore_sigmask(&set); |
81e7009e | 819 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
820 | return -EFAULT; |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
81e7009e | 825 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
826 | struct ucontext __user *new_ctx, |
827 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
828 | { |
829 | unsigned char tmp; | |
1da177e4 LT |
830 | |
831 | /* Context size is for future use. Right now, we only make sure | |
832 | * we are passed something we understand | |
833 | */ | |
81e7009e | 834 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
835 | return -EINVAL; |
836 | ||
837 | if (old_ctx != NULL) { | |
1da177e4 LT |
838 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
839 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) | |
81e7009e SR |
840 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
841 | || __put_user(to_user_ptr(&old_ctx->uc_mcontext), | |
842 | &old_ctx->uc_regs)) | |
1da177e4 LT |
843 | return -EFAULT; |
844 | } | |
845 | if (new_ctx == NULL) | |
846 | return 0; | |
847 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
848 | || __get_user(tmp, (u8 __user *) new_ctx) | |
849 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
850 | return -EFAULT; | |
851 | ||
852 | /* | |
853 | * If we get a fault copying the context into the kernel's | |
854 | * image of the user's registers, we can't just return -EFAULT | |
855 | * because the user's registers will be corrupted. For instance | |
856 | * the NIP value may have been updated but not some of the | |
857 | * other registers. Given that we have done the access_ok | |
858 | * and successfully read the first and last bytes of the region | |
859 | * above, this should only happen in an out-of-memory situation | |
860 | * or if another thread unmaps the region containing the context. | |
861 | * We kill the task with a SIGSEGV in this situation. | |
862 | */ | |
81e7009e | 863 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 864 | do_exit(SIGSEGV); |
401d1f02 DW |
865 | |
866 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
867 | return 0; |
868 | } | |
869 | ||
81e7009e | 870 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
871 | struct pt_regs *regs) |
872 | { | |
81e7009e | 873 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
874 | |
875 | /* Always make any pending restarted system calls return -EINTR */ | |
876 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
877 | ||
81e7009e SR |
878 | rt_sf = (struct rt_sigframe __user *) |
879 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
880 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
881 | goto bad; | |
81e7009e | 882 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
883 | goto bad; |
884 | ||
885 | /* | |
886 | * It's not clear whether or why it is desirable to save the | |
887 | * sigaltstack setting on signal delivery and restore it on | |
888 | * signal return. But other architectures do this and we have | |
889 | * always done it up until now so it is probably better not to | |
890 | * change it. -- paulus | |
81e7009e SR |
891 | */ |
892 | #ifdef CONFIG_PPC64 | |
893 | /* | |
b09a4913 | 894 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
895 | * and takes userland pointer directly. What about error checking ? |
896 | * nobody does any... | |
897 | */ | |
b09a4913 | 898 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
899 | #else |
900 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 901 | #endif |
401d1f02 DW |
902 | set_thread_flag(TIF_RESTOREALL); |
903 | return 0; | |
1da177e4 LT |
904 | |
905 | bad: | |
906 | force_sig(SIGSEGV, current); | |
907 | return 0; | |
908 | } | |
909 | ||
81e7009e SR |
910 | #ifdef CONFIG_PPC32 |
911 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
912 | int ndbg, struct sig_dbg_op __user *dbg, | |
913 | int r6, int r7, int r8, | |
914 | struct pt_regs *regs) | |
915 | { | |
916 | struct sig_dbg_op op; | |
917 | int i; | |
7c85d1f9 | 918 | unsigned char tmp; |
81e7009e SR |
919 | unsigned long new_msr = regs->msr; |
920 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
921 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
922 | #endif | |
923 | ||
924 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 925 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
926 | return -EFAULT; |
927 | switch (op.dbg_type) { | |
928 | case SIG_DBG_SINGLE_STEPPING: | |
929 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
930 | if (op.dbg_value) { | |
931 | new_msr |= MSR_DE; | |
932 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
933 | } else { | |
934 | new_msr &= ~MSR_DE; | |
935 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
936 | } | |
937 | #else | |
938 | if (op.dbg_value) | |
939 | new_msr |= MSR_SE; | |
940 | else | |
941 | new_msr &= ~MSR_SE; | |
942 | #endif | |
943 | break; | |
944 | case SIG_DBG_BRANCH_TRACING: | |
945 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
946 | return -EINVAL; | |
947 | #else | |
948 | if (op.dbg_value) | |
949 | new_msr |= MSR_BE; | |
950 | else | |
951 | new_msr &= ~MSR_BE; | |
952 | #endif | |
953 | break; | |
954 | ||
955 | default: | |
956 | return -EINVAL; | |
957 | } | |
958 | } | |
959 | ||
960 | /* We wait until here to actually install the values in the | |
961 | registers so if we fail in the above loop, it will not | |
962 | affect the contents of these registers. After this point, | |
963 | failure is a problem, anyway, and it's very unlikely unless | |
964 | the user is really doing something wrong. */ | |
965 | regs->msr = new_msr; | |
966 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
967 | current->thread.dbcr0 = new_dbcr0; | |
968 | #endif | |
969 | ||
7c85d1f9 PM |
970 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
971 | || __get_user(tmp, (u8 __user *) ctx) | |
972 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
973 | return -EFAULT; | |
974 | ||
81e7009e SR |
975 | /* |
976 | * If we get a fault copying the context into the kernel's | |
977 | * image of the user's registers, we can't just return -EFAULT | |
978 | * because the user's registers will be corrupted. For instance | |
979 | * the NIP value may have been updated but not some of the | |
980 | * other registers. Given that we have done the access_ok | |
981 | * and successfully read the first and last bytes of the region | |
982 | * above, this should only happen in an out-of-memory situation | |
983 | * or if another thread unmaps the region containing the context. | |
984 | * We kill the task with a SIGSEGV in this situation. | |
985 | */ | |
986 | if (do_setcontext(ctx, regs, 1)) { | |
987 | force_sig(SIGSEGV, current); | |
988 | goto out; | |
989 | } | |
990 | ||
991 | /* | |
992 | * It's not clear whether or why it is desirable to save the | |
993 | * sigaltstack setting on signal delivery and restore it on | |
994 | * signal return. But other architectures do this and we have | |
995 | * always done it up until now so it is probably better not to | |
996 | * change it. -- paulus | |
997 | */ | |
998 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
999 | ||
401d1f02 | 1000 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1001 | out: |
1002 | return 0; | |
1003 | } | |
1004 | #endif | |
1da177e4 LT |
1005 | |
1006 | /* | |
1007 | * OK, we're invoking a handler | |
1008 | */ | |
81e7009e SR |
1009 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
1010 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
1011 | unsigned long newsp) | |
1da177e4 | 1012 | { |
81e7009e SR |
1013 | struct sigcontext __user *sc; |
1014 | struct sigregs __user *frame; | |
1da177e4 LT |
1015 | unsigned long origsp = newsp; |
1016 | ||
1017 | /* Set up Signal Frame */ | |
81e7009e SR |
1018 | newsp -= sizeof(struct sigregs); |
1019 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1020 | |
1021 | /* Put a sigcontext on the stack */ | |
1022 | newsp -= sizeof(*sc); | |
81e7009e | 1023 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1024 | |
1025 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1026 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1027 | |
1028 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1029 | goto badframe; | |
1030 | ||
1031 | #if _NSIG != 64 | |
81e7009e | 1032 | #error "Please adjust handle_signal()" |
1da177e4 | 1033 | #endif |
81e7009e | 1034 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1035 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1036 | #ifdef CONFIG_PPC64 |
1da177e4 | 1037 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1038 | #else |
1039 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1040 | #endif | |
1041 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1042 | || __put_user(sig, &sc->signal)) |
1043 | goto badframe; | |
1044 | ||
a5bba930 | 1045 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
1046 | if (save_user_regs(regs, &frame->mctx, 0)) |
1047 | goto badframe; | |
a5bba930 | 1048 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1049 | } else { |
1da177e4 LT |
1050 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1051 | goto badframe; | |
1052 | regs->link = (unsigned long) frame->mctx.tramp; | |
1053 | } | |
1054 | ||
cc657f53 PM |
1055 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1056 | ||
9747dd6f | 1057 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1058 | goto badframe; |
81e7009e | 1059 | regs->gpr[1] = newsp; |
1da177e4 LT |
1060 | regs->gpr[3] = sig; |
1061 | regs->gpr[4] = (unsigned long) sc; | |
1062 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1063 | /* enter the signal handler in big-endian mode */ |
1064 | regs->msr &= ~MSR_LE; | |
1da177e4 | 1065 | regs->trap = 0; |
1da177e4 LT |
1066 | |
1067 | return 1; | |
1068 | ||
1069 | badframe: | |
81e7009e SR |
1070 | #ifdef DEBUG_SIG |
1071 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1072 | regs, frame, newsp); | |
1da177e4 LT |
1073 | #endif |
1074 | force_sigsegv(sig, current); | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Do a signal return; undo the signal stack. | |
1080 | */ | |
81e7009e | 1081 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1082 | struct pt_regs *regs) |
1083 | { | |
81e7009e SR |
1084 | struct sigcontext __user *sc; |
1085 | struct sigcontext sigctx; | |
1086 | struct mcontext __user *sr; | |
1da177e4 | 1087 | sigset_t set; |
1da177e4 LT |
1088 | |
1089 | /* Always make any pending restarted system calls return -EINTR */ | |
1090 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1091 | ||
81e7009e | 1092 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1093 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1094 | goto badframe; | |
1095 | ||
81e7009e | 1096 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1097 | /* |
1098 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1099 | * unused part of the signal stackframe | |
1100 | */ | |
1101 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1102 | #else |
1103 | set.sig[0] = sigctx.oldmask; | |
1104 | set.sig[1] = sigctx._unused[3]; | |
1105 | #endif | |
1da177e4 LT |
1106 | restore_sigmask(&set); |
1107 | ||
81e7009e | 1108 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
1da177e4 LT |
1109 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1110 | || restore_user_regs(regs, sr, 1)) | |
1111 | goto badframe; | |
1112 | ||
401d1f02 | 1113 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1114 | return 0; |
1da177e4 LT |
1115 | |
1116 | badframe: | |
1117 | force_sig(SIGSEGV, current); | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1da177e4 LT |
1121 | /* |
1122 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1123 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1124 | * mistake. | |
1125 | */ | |
81e7009e | 1126 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
1da177e4 LT |
1127 | { |
1128 | siginfo_t info; | |
81e7009e | 1129 | struct k_sigaction ka; |
f27201da | 1130 | unsigned int newsp; |
1da177e4 | 1131 | int signr, ret; |
81e7009e SR |
1132 | |
1133 | #ifdef CONFIG_PPC32 | |
1134 | if (try_to_freeze()) { | |
1135 | signr = 0; | |
1136 | if (!signal_pending(current)) | |
1137 | goto no_signal; | |
1138 | } | |
1139 | #endif | |
1da177e4 | 1140 | |
f27201da DW |
1141 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
1142 | oldset = ¤t->saved_sigmask; | |
1143 | else if (!oldset) | |
1da177e4 LT |
1144 | oldset = ¤t->blocked; |
1145 | ||
1da177e4 | 1146 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
81e7009e SR |
1147 | #ifdef CONFIG_PPC32 |
1148 | no_signal: | |
1149 | #endif | |
1da177e4 LT |
1150 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
1151 | && regs->ccr & 0x10000000 /* error signalled */ | |
1152 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
1153 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
1154 | || ret == ERESTART_RESTARTBLOCK)) { | |
1155 | ||
1156 | if (signr > 0 | |
1157 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
1158 | || (ret == ERESTARTSYS | |
1159 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
1160 | /* make the system call return an EINTR error */ | |
1161 | regs->result = -EINTR; | |
1162 | regs->gpr[3] = EINTR; | |
1163 | /* note that the cr0.SO bit is already set */ | |
1164 | } else { | |
1165 | regs->nip -= 4; /* Back up & retry system call */ | |
1166 | regs->result = 0; | |
1167 | regs->trap = 0; | |
1168 | if (ret == ERESTART_RESTARTBLOCK) | |
1169 | regs->gpr[0] = __NR_restart_syscall; | |
1170 | else | |
1171 | regs->gpr[3] = regs->orig_gpr3; | |
1172 | } | |
1173 | } | |
1174 | ||
f27201da DW |
1175 | if (signr == 0) { |
1176 | /* No signal to deliver -- put the saved sigmask back */ | |
1177 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1178 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1179 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1180 | } | |
1da177e4 | 1181 | return 0; /* no signals delivered */ |
f27201da | 1182 | } |
1da177e4 LT |
1183 | |
1184 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
81e7009e SR |
1185 | && !on_sig_stack(regs->gpr[1])) |
1186 | newsp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
1187 | else |
1188 | newsp = regs->gpr[1]; | |
1189 | newsp &= ~0xfUL; | |
1190 | ||
81e7009e | 1191 | #ifdef CONFIG_PPC64 |
fd9648df AB |
1192 | /* |
1193 | * Reenable the DABR before delivering the signal to | |
1194 | * user space. The DABR will have been cleared if it | |
1195 | * triggered inside the kernel. | |
1196 | */ | |
1197 | if (current->thread.dabr) | |
1198 | set_dabr(current->thread.dabr); | |
81e7009e | 1199 | #endif |
fd9648df | 1200 | |
1da177e4 LT |
1201 | /* Whee! Actually deliver the signal. */ |
1202 | if (ka.sa.sa_flags & SA_SIGINFO) | |
81e7009e | 1203 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1204 | else |
81e7009e | 1205 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1206 | |
69be8f18 | 1207 | if (ret) { |
1da177e4 LT |
1208 | spin_lock_irq(¤t->sighand->siglock); |
1209 | sigorsets(¤t->blocked, ¤t->blocked, | |
1210 | &ka.sa.sa_mask); | |
69be8f18 SR |
1211 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
1212 | sigaddset(¤t->blocked, signr); | |
1da177e4 LT |
1213 | recalc_sigpending(); |
1214 | spin_unlock_irq(¤t->sighand->siglock); | |
f27201da DW |
1215 | /* A signal was successfully delivered; the saved sigmask is in |
1216 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ | |
1217 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1218 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | return ret; | |
1222 | } |