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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 | ||
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 | */ | |
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 | ||
401d1f02 DW |
154 | if (!FULL_REGS(regs)) { |
155 | set_thread_flag(TIF_SAVE_NVGPRS); | |
156 | current_thread_info()->nvgprs_frame = frame->mc_gregs; | |
157 | } | |
158 | ||
159 | for (i = 0; i <= PT_RESULT; i ++) { | |
160 | if (i == 14 && !FULL_REGS(regs)) | |
161 | i = 32; | |
81e7009e SR |
162 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
163 | return -EFAULT; | |
401d1f02 | 164 | } |
81e7009e SR |
165 | return 0; |
166 | } | |
167 | ||
168 | static inline int restore_general_regs(struct pt_regs *regs, | |
169 | struct mcontext __user *sr) | |
170 | { | |
171 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
172 | int i; | |
173 | ||
174 | for (i = 0; i <= PT_RESULT; i++) { | |
175 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
176 | continue; | |
177 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
178 | return -EFAULT; | |
179 | } | |
180 | return 0; | |
181 | } | |
182 | ||
183 | #else /* CONFIG_PPC64 */ | |
184 | ||
81e7009e SR |
185 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
186 | ||
187 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
188 | { | |
189 | return copy_to_user(uset, set, sizeof(*uset)); | |
190 | } | |
191 | ||
9b7cf8b4 | 192 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
193 | { |
194 | return copy_from_user(set, uset, sizeof(*uset)); | |
195 | } | |
196 | ||
197 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
198 | struct old_sigaction __user *act) | |
199 | { | |
200 | old_sigset_t mask; | |
201 | ||
202 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
203 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
204 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
205 | return -EFAULT; | |
206 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
207 | __get_user(mask, &act->sa_mask); | |
208 | siginitset(&new_ka->sa.sa_mask, mask); | |
209 | return 0; | |
210 | } | |
211 | ||
29e646df AV |
212 | #define to_user_ptr(p) ((unsigned long)(p)) |
213 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
214 | |
215 | static inline int save_general_regs(struct pt_regs *regs, | |
216 | struct mcontext __user *frame) | |
217 | { | |
9687c587 DW |
218 | if (!FULL_REGS(regs)) { |
219 | /* Zero out the unsaved GPRs to avoid information | |
220 | leak, and set TIF_SAVE_NVGPRS to ensure that the | |
221 | registers do actually get saved later. */ | |
222 | memset(®s->gpr[14], 0, 18 * sizeof(unsigned long)); | |
223 | current_thread_info()->nvgprs_frame = &frame->mc_gregs; | |
224 | set_thread_flag(TIF_SAVE_NVGPRS); | |
225 | } | |
226 | ||
81e7009e SR |
227 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
228 | } | |
229 | ||
230 | static inline int restore_general_regs(struct pt_regs *regs, | |
231 | struct mcontext __user *sr) | |
232 | { | |
233 | /* copy up to but not including MSR */ | |
234 | if (__copy_from_user(regs, &sr->mc_gregs, | |
235 | PT_MSR * sizeof(elf_greg_t))) | |
236 | return -EFAULT; | |
237 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
238 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
239 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
240 | return -EFAULT; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | #endif /* CONFIG_PPC64 */ | |
245 | ||
246 | int do_signal(sigset_t *oldset, struct pt_regs *regs); | |
247 | ||
248 | /* | |
249 | * Atomically swap in the new signal mask, and wait for a signal. | |
250 | */ | |
150256d8 | 251 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 252 | { |
81e7009e SR |
253 | mask &= _BLOCKABLE; |
254 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 255 | current->saved_sigmask = current->blocked; |
81e7009e SR |
256 | siginitset(¤t->blocked, mask); |
257 | recalc_sigpending(); | |
258 | spin_unlock_irq(¤t->sighand->siglock); | |
259 | ||
150256d8 DW |
260 | current->state = TASK_INTERRUPTIBLE; |
261 | schedule(); | |
262 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
263 | return -ERESTARTNOHAND; | |
81e7009e SR |
264 | } |
265 | ||
266 | #ifdef CONFIG_PPC32 | |
267 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, | |
268 | int r6, int r7, int r8, struct pt_regs *regs) | |
269 | { | |
270 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
271 | } | |
272 | #endif | |
273 | ||
274 | long sys_sigaction(int sig, struct old_sigaction __user *act, | |
275 | struct old_sigaction __user *oact) | |
276 | { | |
277 | struct k_sigaction new_ka, old_ka; | |
278 | int ret; | |
279 | ||
280 | #ifdef CONFIG_PPC64 | |
281 | if (sig < 0) | |
282 | sig = -sig; | |
283 | #endif | |
284 | ||
285 | if (act) { | |
286 | if (get_old_sigaction(&new_ka, act)) | |
287 | return -EFAULT; | |
288 | } | |
289 | ||
290 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
291 | if (!ret && oact) { | |
292 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
293 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
294 | &oact->sa_handler) || | |
295 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
296 | &oact->sa_restorer) || | |
297 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
298 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
299 | return -EFAULT; | |
300 | } | |
301 | ||
302 | return ret; | |
303 | } | |
1da177e4 LT |
304 | |
305 | /* | |
306 | * When we have signals to deliver, we set up on the | |
307 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
308 | * a sigregs struct |
309 | * a sigcontext struct | |
310 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
311 | * |
312 | * Each of these things must be a multiple of 16 bytes in size. | |
313 | * | |
314 | */ | |
81e7009e SR |
315 | struct sigregs { |
316 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
317 | /* |
318 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
319 | * regs and 18 fp regs below sp before decrementing it. | |
320 | */ | |
321 | int abigap[56]; | |
322 | }; | |
323 | ||
324 | /* We use the mc_pad field for the signal return trampoline. */ | |
325 | #define tramp mc_pad | |
326 | ||
327 | /* | |
328 | * When we have rt signals to deliver, we set up on the | |
329 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
330 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
331 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
332 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
333 | * positions as in older kernels). |
334 | * | |
335 | * Each of these things must be a multiple of 16 bytes in size. | |
336 | * | |
337 | */ | |
81e7009e SR |
338 | struct rt_sigframe { |
339 | #ifdef CONFIG_PPC64 | |
340 | compat_siginfo_t info; | |
341 | #else | |
342 | struct siginfo info; | |
343 | #endif | |
344 | struct ucontext uc; | |
1da177e4 LT |
345 | /* |
346 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
347 | * regs and 18 fp regs below sp before decrementing it. | |
348 | */ | |
349 | int abigap[56]; | |
350 | }; | |
351 | ||
1da177e4 LT |
352 | /* |
353 | * Save the current user registers on the user stack. | |
81e7009e SR |
354 | * We only save the altivec/spe registers if the process has used |
355 | * altivec/spe instructions at some point. | |
1da177e4 | 356 | */ |
81e7009e SR |
357 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
358 | int sigret) | |
1da177e4 | 359 | { |
1da177e4 LT |
360 | /* Make sure floating point registers are stored in regs */ |
361 | flush_fp_to_thread(current); | |
362 | ||
363 | /* save general and floating-point registers */ | |
81e7009e SR |
364 | if (save_general_regs(regs, frame) || |
365 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
366 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
367 | return 1; |
368 | ||
1da177e4 LT |
369 | #ifdef CONFIG_ALTIVEC |
370 | /* save altivec registers */ | |
371 | if (current->thread.used_vr) { | |
372 | flush_altivec_to_thread(current); | |
373 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 374 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
375 | return 1; |
376 | /* set MSR_VEC in the saved MSR value to indicate that | |
377 | frame->mc_vregs contains valid data */ | |
378 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
379 | return 1; | |
380 | } | |
381 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
382 | ||
383 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
384 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
385 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
386 | * most significant bits of that same vector. --BenH | |
387 | */ | |
388 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
389 | return 1; | |
390 | #endif /* CONFIG_ALTIVEC */ | |
391 | ||
81e7009e SR |
392 | #ifdef CONFIG_SPE |
393 | /* save spe registers */ | |
394 | if (current->thread.used_spe) { | |
395 | flush_spe_to_thread(current); | |
396 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
397 | ELF_NEVRREG * sizeof(u32))) | |
398 | return 1; | |
399 | /* set MSR_SPE in the saved MSR value to indicate that | |
400 | frame->mc_vregs contains valid data */ | |
401 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
402 | return 1; | |
403 | } | |
404 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
405 | ||
406 | /* We always copy to/from spefscr */ | |
407 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
408 | return 1; | |
409 | #endif /* CONFIG_SPE */ | |
410 | ||
1da177e4 LT |
411 | if (sigret) { |
412 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
413 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
414 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
415 | return 1; | |
416 | flush_icache_range((unsigned long) &frame->tramp[0], | |
417 | (unsigned long) &frame->tramp[2]); | |
418 | } | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Restore the current user register values from the user stack, | |
425 | * (except for MSR). | |
426 | */ | |
427 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 428 | struct mcontext __user *sr, int sig) |
1da177e4 | 429 | { |
81e7009e | 430 | long err; |
1da177e4 | 431 | unsigned int save_r2 = 0; |
81e7009e | 432 | #if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE) |
1da177e4 LT |
433 | unsigned long msr; |
434 | #endif | |
435 | ||
436 | /* | |
437 | * restore general registers but not including MSR or SOFTE. Also | |
438 | * take care of keeping r2 (TLS) intact if not a signal | |
439 | */ | |
440 | if (!sig) | |
441 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 442 | err = restore_general_regs(regs, sr); |
1da177e4 LT |
443 | if (!sig) |
444 | regs->gpr[2] = (unsigned long) save_r2; | |
445 | if (err) | |
446 | return 1; | |
447 | ||
5388fb10 PM |
448 | /* |
449 | * Do this before updating the thread state in | |
450 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
451 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
452 | * tempted to save the current CPU state into the thread_struct | |
453 | * and corrupt what we are writing there. | |
454 | */ | |
455 | discard_lazy_cpu_state(); | |
456 | ||
1da177e4 LT |
457 | /* force the process to reload the FP registers from |
458 | current->thread when it next does FP instructions */ | |
459 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
460 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
461 | sizeof(sr->mc_fregs))) | |
462 | return 1; | |
463 | ||
464 | #ifdef CONFIG_ALTIVEC | |
465 | /* force the process to reload the altivec registers from | |
466 | current->thread when it next does altivec instructions */ | |
467 | regs->msr &= ~MSR_VEC; | |
468 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { | |
469 | /* restore altivec registers from the stack */ | |
470 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
471 | sizeof(sr->mc_vregs))) | |
472 | return 1; | |
473 | } else if (current->thread.used_vr) | |
81e7009e | 474 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
475 | |
476 | /* Always get VRSAVE back */ | |
477 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
478 | return 1; | |
479 | #endif /* CONFIG_ALTIVEC */ | |
480 | ||
81e7009e SR |
481 | #ifdef CONFIG_SPE |
482 | /* force the process to reload the spe registers from | |
483 | current->thread when it next does spe instructions */ | |
484 | regs->msr &= ~MSR_SPE; | |
485 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) { | |
486 | /* restore spe registers from the stack */ | |
487 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
488 | ELF_NEVRREG * sizeof(u32))) | |
489 | return 1; | |
490 | } else if (current->thread.used_spe) | |
491 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
492 | ||
493 | /* Always get SPEFSCR back */ | |
494 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
495 | return 1; | |
496 | #endif /* CONFIG_SPE */ | |
497 | ||
1da177e4 LT |
498 | return 0; |
499 | } | |
500 | ||
81e7009e | 501 | #ifdef CONFIG_PPC64 |
b09a4913 | 502 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
503 | struct sigaction32 __user *oact, size_t sigsetsize) |
504 | { | |
505 | struct k_sigaction new_ka, old_ka; | |
506 | int ret; | |
1da177e4 LT |
507 | |
508 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
509 | if (sigsetsize != sizeof(compat_sigset_t)) | |
510 | return -EINVAL; | |
511 | ||
512 | if (act) { | |
513 | compat_uptr_t handler; | |
514 | ||
515 | ret = get_user(handler, &act->sa_handler); | |
516 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 517 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
518 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
519 | if (ret) | |
520 | return -EFAULT; | |
521 | } | |
522 | ||
523 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
524 | if (!ret && oact) { | |
29e646df | 525 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 526 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
527 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
528 | } | |
529 | return ret; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Note: it is necessary to treat how as an unsigned int, with the | |
534 | * corresponding cast to a signed int to insure that the proper | |
535 | * conversion (sign extension) between the register representation | |
536 | * of a signed int (msr in 32-bit mode) and the register representation | |
537 | * of a signed int (msr in 64-bit mode) is performed. | |
538 | */ | |
b09a4913 | 539 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
540 | compat_sigset_t __user *oset, size_t sigsetsize) |
541 | { | |
542 | sigset_t s; | |
543 | sigset_t __user *up; | |
1da177e4 LT |
544 | int ret; |
545 | mm_segment_t old_fs = get_fs(); | |
546 | ||
547 | if (set) { | |
81e7009e SR |
548 | if (get_sigset_t(&s, set)) |
549 | return -EFAULT; | |
1da177e4 | 550 | } |
81e7009e | 551 | |
1da177e4 LT |
552 | set_fs(KERNEL_DS); |
553 | /* This is valid because of the set_fs() */ | |
554 | up = (sigset_t __user *) &s; | |
555 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 556 | sigsetsize); |
1da177e4 LT |
557 | set_fs(old_fs); |
558 | if (ret) | |
559 | return ret; | |
560 | if (oset) { | |
81e7009e | 561 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
562 | return -EFAULT; |
563 | } | |
564 | return 0; | |
565 | } | |
566 | ||
b09a4913 | 567 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
568 | { |
569 | sigset_t s; | |
1da177e4 LT |
570 | int ret; |
571 | mm_segment_t old_fs = get_fs(); | |
572 | ||
573 | set_fs(KERNEL_DS); | |
574 | /* The __user pointer cast is valid because of the set_fs() */ | |
575 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
576 | set_fs(old_fs); | |
577 | if (!ret) { | |
81e7009e | 578 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
579 | return -EFAULT; |
580 | } | |
581 | return ret; | |
582 | } | |
583 | ||
584 | ||
585 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
586 | { | |
587 | int err; | |
588 | ||
589 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
590 | return -EFAULT; | |
591 | ||
592 | /* If you change siginfo_t structure, please be sure | |
593 | * this code is fixed accordingly. | |
594 | * It should never copy any pad contained in the structure | |
595 | * to avoid security leaks, but must copy the generic | |
596 | * 3 ints plus the relevant union member. | |
597 | * This routine must convert siginfo from 64bit to 32bit as well | |
598 | * at the same time. | |
599 | */ | |
600 | err = __put_user(s->si_signo, &d->si_signo); | |
601 | err |= __put_user(s->si_errno, &d->si_errno); | |
602 | err |= __put_user((short)s->si_code, &d->si_code); | |
603 | if (s->si_code < 0) | |
604 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
605 | SI_PAD_SIZE32); | |
606 | else switch(s->si_code >> 16) { | |
607 | case __SI_CHLD >> 16: | |
608 | err |= __put_user(s->si_pid, &d->si_pid); | |
609 | err |= __put_user(s->si_uid, &d->si_uid); | |
610 | err |= __put_user(s->si_utime, &d->si_utime); | |
611 | err |= __put_user(s->si_stime, &d->si_stime); | |
612 | err |= __put_user(s->si_status, &d->si_status); | |
613 | break; | |
614 | case __SI_FAULT >> 16: | |
615 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
616 | &d->si_addr); | |
617 | break; | |
618 | case __SI_POLL >> 16: | |
619 | err |= __put_user(s->si_band, &d->si_band); | |
620 | err |= __put_user(s->si_fd, &d->si_fd); | |
621 | break; | |
622 | case __SI_TIMER >> 16: | |
623 | err |= __put_user(s->si_tid, &d->si_tid); | |
624 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
625 | err |= __put_user(s->si_int, &d->si_int); | |
626 | break; | |
627 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
628 | case __SI_MESGQ >> 16: | |
629 | err |= __put_user(s->si_int, &d->si_int); | |
630 | /* fallthrough */ | |
631 | case __SI_KILL >> 16: | |
632 | default: | |
633 | err |= __put_user(s->si_pid, &d->si_pid); | |
634 | err |= __put_user(s->si_uid, &d->si_uid); | |
635 | break; | |
636 | } | |
637 | return err; | |
638 | } | |
639 | ||
81e7009e SR |
640 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
641 | ||
1da177e4 LT |
642 | /* |
643 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
644 | * corresponding cast to a signed int to insure that the proper conversion | |
645 | * (sign extension) between the register representation of a signed int | |
646 | * (msr in 32-bit mode) and the register representation of a signed int | |
647 | * (msr in 64-bit mode) is performed. | |
648 | */ | |
b09a4913 | 649 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
650 | { |
651 | siginfo_t info; | |
652 | int ret; | |
653 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 654 | |
1da177e4 LT |
655 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
656 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
657 | return -EFAULT; | |
658 | set_fs (KERNEL_DS); | |
659 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
660 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
661 | set_fs (old_fs); | |
662 | return ret; | |
663 | } | |
1da177e4 LT |
664 | /* |
665 | * Start Alternate signal stack support | |
666 | * | |
667 | * System Calls | |
b09a4913 | 668 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
669 | */ |
670 | ||
b09a4913 | 671 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
672 | int r6, int r7, int r8, struct pt_regs *regs) |
673 | { | |
29e646df AV |
674 | stack_32_t __user * newstack = compat_ptr(__new); |
675 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
676 | stack_t uss, uoss; |
677 | int ret; | |
678 | mm_segment_t old_fs; | |
679 | unsigned long sp; | |
680 | compat_uptr_t ss_sp; | |
681 | ||
682 | /* | |
683 | * set sp to the user stack on entry to the system call | |
684 | * the system call router sets R9 to the saved registers | |
685 | */ | |
686 | sp = regs->gpr[1]; | |
687 | ||
688 | /* Put new stack info in local 64 bit stack struct */ | |
689 | if (newstack) { | |
690 | if (get_user(ss_sp, &newstack->ss_sp) || | |
691 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
692 | __get_user(uss.ss_size, &newstack->ss_size)) | |
693 | return -EFAULT; | |
694 | uss.ss_sp = compat_ptr(ss_sp); | |
695 | } | |
696 | ||
697 | old_fs = get_fs(); | |
698 | set_fs(KERNEL_DS); | |
699 | /* The __user pointer casts are valid because of the set_fs() */ | |
700 | ret = do_sigaltstack( | |
701 | newstack ? (stack_t __user *) &uss : NULL, | |
702 | oldstack ? (stack_t __user *) &uoss : NULL, | |
703 | sp); | |
704 | set_fs(old_fs); | |
705 | /* Copy the stack information to the user output buffer */ | |
706 | if (!ret && oldstack && | |
29e646df | 707 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
708 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
709 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
710 | return -EFAULT; | |
711 | return ret; | |
712 | } | |
81e7009e | 713 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
714 | |
715 | ||
81e7009e SR |
716 | /* |
717 | * Restore the user process's signal mask | |
718 | */ | |
719 | #ifdef CONFIG_PPC64 | |
720 | extern void restore_sigmask(sigset_t *set); | |
721 | #else /* CONFIG_PPC64 */ | |
722 | static void restore_sigmask(sigset_t *set) | |
723 | { | |
724 | sigdelsetmask(set, ~_BLOCKABLE); | |
725 | spin_lock_irq(¤t->sighand->siglock); | |
726 | current->blocked = *set; | |
727 | recalc_sigpending(); | |
728 | spin_unlock_irq(¤t->sighand->siglock); | |
729 | } | |
730 | #endif | |
731 | ||
1da177e4 LT |
732 | /* |
733 | * Set up a signal frame for a "real-time" signal handler | |
734 | * (one which gets siginfo). | |
735 | */ | |
81e7009e SR |
736 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
737 | siginfo_t *info, sigset_t *oldset, | |
738 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 739 | { |
81e7009e SR |
740 | struct rt_sigframe __user *rt_sf; |
741 | struct mcontext __user *frame; | |
1da177e4 | 742 | unsigned long origsp = newsp; |
1da177e4 LT |
743 | |
744 | /* Set up Signal Frame */ | |
745 | /* Put a Real Time Context onto stack */ | |
746 | newsp -= sizeof(*rt_sf); | |
81e7009e | 747 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
748 | |
749 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 750 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
751 | |
752 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
753 | goto badframe; | |
754 | ||
1da177e4 | 755 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 756 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
757 | || __put_user(0, &rt_sf->uc.uc_flags) |
758 | || __put_user(0, &rt_sf->uc.uc_link) | |
759 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
760 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
761 | &rt_sf->uc.uc_stack.ss_flags) | |
762 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
763 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
764 | &rt_sf->uc.uc_regs) | |
765 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
766 | goto badframe; |
767 | ||
768 | /* Save user registers on the stack */ | |
769 | frame = &rt_sf->uc.uc_mcontext; | |
1da177e4 LT |
770 | if (vdso32_rt_sigtramp && current->thread.vdso_base) { |
771 | if (save_user_regs(regs, frame, 0)) | |
772 | goto badframe; | |
773 | regs->link = current->thread.vdso_base + vdso32_rt_sigtramp; | |
a7f290da | 774 | } else { |
1da177e4 LT |
775 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
776 | goto badframe; | |
777 | regs->link = (unsigned long) frame->tramp; | |
778 | } | |
cc657f53 PM |
779 | |
780 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
781 | ||
e2b55306 | 782 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
783 | goto badframe; |
784 | regs->gpr[1] = newsp; | |
1da177e4 LT |
785 | regs->gpr[3] = sig; |
786 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
787 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
788 | regs->gpr[6] = (unsigned long) rt_sf; | |
789 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
790 | regs->trap = 0; | |
1da177e4 LT |
791 | return 1; |
792 | ||
793 | badframe: | |
81e7009e | 794 | #ifdef DEBUG_SIG |
1da177e4 LT |
795 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
796 | regs, frame, newsp); | |
797 | #endif | |
798 | force_sigsegv(sig, current); | |
799 | return 0; | |
800 | } | |
801 | ||
81e7009e | 802 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 803 | { |
1da177e4 | 804 | sigset_t set; |
81e7009e SR |
805 | struct mcontext __user *mcp; |
806 | ||
807 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
808 | return -EFAULT; | |
809 | #ifdef CONFIG_PPC64 | |
810 | { | |
811 | u32 cmcp; | |
1da177e4 | 812 | |
81e7009e SR |
813 | if (__get_user(cmcp, &ucp->uc_regs)) |
814 | return -EFAULT; | |
815 | mcp = (struct mcontext __user *)(u64)cmcp; | |
816 | } | |
817 | #else | |
818 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 819 | return -EFAULT; |
81e7009e | 820 | #endif |
1da177e4 | 821 | restore_sigmask(&set); |
81e7009e | 822 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
823 | return -EFAULT; |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
81e7009e SR |
828 | long sys_swapcontext(struct ucontext __user *old_ctx, |
829 | struct ucontext __user *new_ctx, | |
1da177e4 LT |
830 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) |
831 | { | |
832 | unsigned char tmp; | |
1da177e4 LT |
833 | |
834 | /* Context size is for future use. Right now, we only make sure | |
835 | * we are passed something we understand | |
836 | */ | |
81e7009e | 837 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
838 | return -EINVAL; |
839 | ||
840 | if (old_ctx != NULL) { | |
1da177e4 LT |
841 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
842 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) | |
81e7009e SR |
843 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
844 | || __put_user(to_user_ptr(&old_ctx->uc_mcontext), | |
845 | &old_ctx->uc_regs)) | |
1da177e4 LT |
846 | return -EFAULT; |
847 | } | |
848 | if (new_ctx == NULL) | |
849 | return 0; | |
850 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
851 | || __get_user(tmp, (u8 __user *) new_ctx) | |
852 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
853 | return -EFAULT; | |
854 | ||
855 | /* | |
856 | * If we get a fault copying the context into the kernel's | |
857 | * image of the user's registers, we can't just return -EFAULT | |
858 | * because the user's registers will be corrupted. For instance | |
859 | * the NIP value may have been updated but not some of the | |
860 | * other registers. Given that we have done the access_ok | |
861 | * and successfully read the first and last bytes of the region | |
862 | * above, this should only happen in an out-of-memory situation | |
863 | * or if another thread unmaps the region containing the context. | |
864 | * We kill the task with a SIGSEGV in this situation. | |
865 | */ | |
81e7009e | 866 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 867 | do_exit(SIGSEGV); |
401d1f02 DW |
868 | |
869 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
870 | return 0; |
871 | } | |
872 | ||
81e7009e | 873 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
874 | struct pt_regs *regs) |
875 | { | |
81e7009e | 876 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
877 | |
878 | /* Always make any pending restarted system calls return -EINTR */ | |
879 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
880 | ||
81e7009e SR |
881 | rt_sf = (struct rt_sigframe __user *) |
882 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
883 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
884 | goto bad; | |
81e7009e | 885 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
886 | goto bad; |
887 | ||
888 | /* | |
889 | * It's not clear whether or why it is desirable to save the | |
890 | * sigaltstack setting on signal delivery and restore it on | |
891 | * signal return. But other architectures do this and we have | |
892 | * always done it up until now so it is probably better not to | |
893 | * change it. -- paulus | |
81e7009e SR |
894 | */ |
895 | #ifdef CONFIG_PPC64 | |
896 | /* | |
b09a4913 | 897 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
898 | * and takes userland pointer directly. What about error checking ? |
899 | * nobody does any... | |
900 | */ | |
b09a4913 | 901 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
902 | #else |
903 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 904 | #endif |
401d1f02 DW |
905 | set_thread_flag(TIF_RESTOREALL); |
906 | return 0; | |
1da177e4 LT |
907 | |
908 | bad: | |
909 | force_sig(SIGSEGV, current); | |
910 | return 0; | |
911 | } | |
912 | ||
81e7009e SR |
913 | #ifdef CONFIG_PPC32 |
914 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
915 | int ndbg, struct sig_dbg_op __user *dbg, | |
916 | int r6, int r7, int r8, | |
917 | struct pt_regs *regs) | |
918 | { | |
919 | struct sig_dbg_op op; | |
920 | int i; | |
921 | unsigned long new_msr = regs->msr; | |
922 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
923 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
924 | #endif | |
925 | ||
926 | for (i=0; i<ndbg; i++) { | |
927 | if (__copy_from_user(&op, dbg, sizeof(op))) | |
928 | return -EFAULT; | |
929 | switch (op.dbg_type) { | |
930 | case SIG_DBG_SINGLE_STEPPING: | |
931 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
932 | if (op.dbg_value) { | |
933 | new_msr |= MSR_DE; | |
934 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
935 | } else { | |
936 | new_msr &= ~MSR_DE; | |
937 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
938 | } | |
939 | #else | |
940 | if (op.dbg_value) | |
941 | new_msr |= MSR_SE; | |
942 | else | |
943 | new_msr &= ~MSR_SE; | |
944 | #endif | |
945 | break; | |
946 | case SIG_DBG_BRANCH_TRACING: | |
947 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
948 | return -EINVAL; | |
949 | #else | |
950 | if (op.dbg_value) | |
951 | new_msr |= MSR_BE; | |
952 | else | |
953 | new_msr &= ~MSR_BE; | |
954 | #endif | |
955 | break; | |
956 | ||
957 | default: | |
958 | return -EINVAL; | |
959 | } | |
960 | } | |
961 | ||
962 | /* We wait until here to actually install the values in the | |
963 | registers so if we fail in the above loop, it will not | |
964 | affect the contents of these registers. After this point, | |
965 | failure is a problem, anyway, and it's very unlikely unless | |
966 | the user is really doing something wrong. */ | |
967 | regs->msr = new_msr; | |
968 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
969 | current->thread.dbcr0 = new_dbcr0; | |
970 | #endif | |
971 | ||
972 | /* | |
973 | * If we get a fault copying the context into the kernel's | |
974 | * image of the user's registers, we can't just return -EFAULT | |
975 | * because the user's registers will be corrupted. For instance | |
976 | * the NIP value may have been updated but not some of the | |
977 | * other registers. Given that we have done the access_ok | |
978 | * and successfully read the first and last bytes of the region | |
979 | * above, this should only happen in an out-of-memory situation | |
980 | * or if another thread unmaps the region containing the context. | |
981 | * We kill the task with a SIGSEGV in this situation. | |
982 | */ | |
983 | if (do_setcontext(ctx, regs, 1)) { | |
984 | force_sig(SIGSEGV, current); | |
985 | goto out; | |
986 | } | |
987 | ||
988 | /* | |
989 | * It's not clear whether or why it is desirable to save the | |
990 | * sigaltstack setting on signal delivery and restore it on | |
991 | * signal return. But other architectures do this and we have | |
992 | * always done it up until now so it is probably better not to | |
993 | * change it. -- paulus | |
994 | */ | |
995 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
996 | ||
401d1f02 | 997 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
998 | out: |
999 | return 0; | |
1000 | } | |
1001 | #endif | |
1da177e4 LT |
1002 | |
1003 | /* | |
1004 | * OK, we're invoking a handler | |
1005 | */ | |
81e7009e SR |
1006 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
1007 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
1008 | unsigned long newsp) | |
1da177e4 | 1009 | { |
81e7009e SR |
1010 | struct sigcontext __user *sc; |
1011 | struct sigregs __user *frame; | |
1da177e4 LT |
1012 | unsigned long origsp = newsp; |
1013 | ||
1014 | /* Set up Signal Frame */ | |
81e7009e SR |
1015 | newsp -= sizeof(struct sigregs); |
1016 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1017 | |
1018 | /* Put a sigcontext on the stack */ | |
1019 | newsp -= sizeof(*sc); | |
81e7009e | 1020 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1021 | |
1022 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1023 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1024 | |
1025 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1026 | goto badframe; | |
1027 | ||
1028 | #if _NSIG != 64 | |
81e7009e | 1029 | #error "Please adjust handle_signal()" |
1da177e4 | 1030 | #endif |
81e7009e | 1031 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1032 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1033 | #ifdef CONFIG_PPC64 |
1da177e4 | 1034 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1035 | #else |
1036 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1037 | #endif | |
1038 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1039 | || __put_user(sig, &sc->signal)) |
1040 | goto badframe; | |
1041 | ||
1042 | if (vdso32_sigtramp && current->thread.vdso_base) { | |
1043 | if (save_user_regs(regs, &frame->mctx, 0)) | |
1044 | goto badframe; | |
1045 | regs->link = current->thread.vdso_base + vdso32_sigtramp; | |
a7f290da | 1046 | } else { |
1da177e4 LT |
1047 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1048 | goto badframe; | |
1049 | regs->link = (unsigned long) frame->mctx.tramp; | |
1050 | } | |
1051 | ||
cc657f53 PM |
1052 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1053 | ||
9747dd6f | 1054 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1055 | goto badframe; |
81e7009e | 1056 | regs->gpr[1] = newsp; |
1da177e4 LT |
1057 | regs->gpr[3] = sig; |
1058 | regs->gpr[4] = (unsigned long) sc; | |
1059 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
1060 | regs->trap = 0; | |
1da177e4 LT |
1061 | |
1062 | return 1; | |
1063 | ||
1064 | badframe: | |
81e7009e SR |
1065 | #ifdef DEBUG_SIG |
1066 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1067 | regs, frame, newsp); | |
1da177e4 LT |
1068 | #endif |
1069 | force_sigsegv(sig, current); | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Do a signal return; undo the signal stack. | |
1075 | */ | |
81e7009e | 1076 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1077 | struct pt_regs *regs) |
1078 | { | |
81e7009e SR |
1079 | struct sigcontext __user *sc; |
1080 | struct sigcontext sigctx; | |
1081 | struct mcontext __user *sr; | |
1da177e4 | 1082 | sigset_t set; |
1da177e4 LT |
1083 | |
1084 | /* Always make any pending restarted system calls return -EINTR */ | |
1085 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1086 | ||
81e7009e | 1087 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1088 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1089 | goto badframe; | |
1090 | ||
81e7009e | 1091 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1092 | /* |
1093 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1094 | * unused part of the signal stackframe | |
1095 | */ | |
1096 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1097 | #else |
1098 | set.sig[0] = sigctx.oldmask; | |
1099 | set.sig[1] = sigctx._unused[3]; | |
1100 | #endif | |
1da177e4 LT |
1101 | restore_sigmask(&set); |
1102 | ||
81e7009e | 1103 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
1da177e4 LT |
1104 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1105 | || restore_user_regs(regs, sr, 1)) | |
1106 | goto badframe; | |
1107 | ||
401d1f02 | 1108 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1109 | return 0; |
1da177e4 LT |
1110 | |
1111 | badframe: | |
1112 | force_sig(SIGSEGV, current); | |
1113 | return 0; | |
1114 | } | |
1115 | ||
1da177e4 LT |
1116 | /* |
1117 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1118 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1119 | * mistake. | |
1120 | */ | |
81e7009e | 1121 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
1da177e4 LT |
1122 | { |
1123 | siginfo_t info; | |
81e7009e | 1124 | struct k_sigaction ka; |
f27201da | 1125 | unsigned int newsp; |
1da177e4 | 1126 | int signr, ret; |
81e7009e SR |
1127 | |
1128 | #ifdef CONFIG_PPC32 | |
1129 | if (try_to_freeze()) { | |
1130 | signr = 0; | |
1131 | if (!signal_pending(current)) | |
1132 | goto no_signal; | |
1133 | } | |
1134 | #endif | |
1da177e4 | 1135 | |
f27201da DW |
1136 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
1137 | oldset = ¤t->saved_sigmask; | |
1138 | else if (!oldset) | |
1da177e4 LT |
1139 | oldset = ¤t->blocked; |
1140 | ||
1da177e4 | 1141 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
81e7009e SR |
1142 | #ifdef CONFIG_PPC32 |
1143 | no_signal: | |
1144 | #endif | |
1da177e4 LT |
1145 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
1146 | && regs->ccr & 0x10000000 /* error signalled */ | |
1147 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
1148 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
1149 | || ret == ERESTART_RESTARTBLOCK)) { | |
1150 | ||
1151 | if (signr > 0 | |
1152 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
1153 | || (ret == ERESTARTSYS | |
1154 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
1155 | /* make the system call return an EINTR error */ | |
1156 | regs->result = -EINTR; | |
1157 | regs->gpr[3] = EINTR; | |
1158 | /* note that the cr0.SO bit is already set */ | |
1159 | } else { | |
1160 | regs->nip -= 4; /* Back up & retry system call */ | |
1161 | regs->result = 0; | |
1162 | regs->trap = 0; | |
1163 | if (ret == ERESTART_RESTARTBLOCK) | |
1164 | regs->gpr[0] = __NR_restart_syscall; | |
1165 | else | |
1166 | regs->gpr[3] = regs->orig_gpr3; | |
1167 | } | |
1168 | } | |
1169 | ||
f27201da DW |
1170 | if (signr == 0) { |
1171 | /* No signal to deliver -- put the saved sigmask back */ | |
1172 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1173 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1174 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1175 | } | |
1da177e4 | 1176 | return 0; /* no signals delivered */ |
f27201da | 1177 | } |
1da177e4 LT |
1178 | |
1179 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
81e7009e SR |
1180 | && !on_sig_stack(regs->gpr[1])) |
1181 | newsp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
1182 | else |
1183 | newsp = regs->gpr[1]; | |
1184 | newsp &= ~0xfUL; | |
1185 | ||
81e7009e | 1186 | #ifdef CONFIG_PPC64 |
fd9648df AB |
1187 | /* |
1188 | * Reenable the DABR before delivering the signal to | |
1189 | * user space. The DABR will have been cleared if it | |
1190 | * triggered inside the kernel. | |
1191 | */ | |
1192 | if (current->thread.dabr) | |
1193 | set_dabr(current->thread.dabr); | |
81e7009e | 1194 | #endif |
fd9648df | 1195 | |
1da177e4 LT |
1196 | /* Whee! Actually deliver the signal. */ |
1197 | if (ka.sa.sa_flags & SA_SIGINFO) | |
81e7009e | 1198 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1199 | else |
81e7009e | 1200 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1201 | |
69be8f18 | 1202 | if (ret) { |
1da177e4 LT |
1203 | spin_lock_irq(¤t->sighand->siglock); |
1204 | sigorsets(¤t->blocked, ¤t->blocked, | |
1205 | &ka.sa.sa_mask); | |
69be8f18 SR |
1206 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
1207 | sigaddset(¤t->blocked, signr); | |
1da177e4 LT |
1208 | recalc_sigpending(); |
1209 | spin_unlock_irq(¤t->sighand->siglock); | |
f27201da DW |
1210 | /* A signal was successfully delivered; the saved sigmask is in |
1211 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ | |
1212 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1213 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | return ret; | |
1217 | } |