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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 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/kernel.h> |
24 | #include <linux/signal.h> | |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/elf.h> | |
05ead015 | 27 | #include <linux/ptrace.h> |
76462232 | 28 | #include <linux/ratelimit.h> |
81e7009e SR |
29 | #ifdef CONFIG_PPC64 |
30 | #include <linux/syscalls.h> | |
1da177e4 | 31 | #include <linux/compat.h> |
81e7009e SR |
32 | #else |
33 | #include <linux/wait.h> | |
81e7009e SR |
34 | #include <linux/unistd.h> |
35 | #include <linux/stddef.h> | |
36 | #include <linux/tty.h> | |
37 | #include <linux/binfmts.h> | |
7dfb7103 | 38 | #include <linux/freezer.h> |
81e7009e SR |
39 | #endif |
40 | ||
1da177e4 | 41 | #include <asm/uaccess.h> |
81e7009e | 42 | #include <asm/cacheflush.h> |
a7f31841 | 43 | #include <asm/syscalls.h> |
c5ff7001 | 44 | #include <asm/sigcontext.h> |
a7f290da | 45 | #include <asm/vdso.h> |
ae3a197e | 46 | #include <asm/switch_to.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 | |
22e38f29 BH |
55 | #include "signal.h" |
56 | ||
81e7009e | 57 | #undef DEBUG_SIG |
1da177e4 | 58 | |
81e7009e | 59 | #ifdef CONFIG_PPC64 |
b09a4913 SR |
60 | #define sys_sigsuspend compat_sys_sigsuspend |
61 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
62 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
63 | #define sys_sigaction compat_sys_sigaction | |
64 | #define sys_swapcontext compat_sys_swapcontext | |
65 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
66 | |
67 | #define old_sigaction old_sigaction32 | |
68 | #define sigcontext sigcontext32 | |
69 | #define mcontext mcontext32 | |
70 | #define ucontext ucontext32 | |
71 | ||
c1cb299e MN |
72 | /* |
73 | * Userspace code may pass a ucontext which doesn't include VSX added | |
74 | * at the end. We need to check for this case. | |
75 | */ | |
76 | #define UCONTEXTSIZEWITHOUTVSX \ | |
77 | (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) | |
78 | ||
81e7009e SR |
79 | /* |
80 | * Returning 0 means we return to userspace via | |
81 | * ret_from_except and thus restore all user | |
82 | * registers from *regs. This is what we need | |
83 | * to do when a signal has been delivered. | |
84 | */ | |
81e7009e SR |
85 | |
86 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
87 | #undef __SIGNAL_FRAMESIZE | |
88 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
89 | #undef ELF_NVRREG | |
90 | #define ELF_NVRREG ELF_NVRREG32 | |
91 | ||
92 | /* | |
93 | * Functions for flipping sigsets (thanks to brain dead generic | |
94 | * implementation that makes things simple for little endian only) | |
95 | */ | |
96 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
97 | { | |
98 | compat_sigset_t cset; | |
99 | ||
100 | switch (_NSIG_WORDS) { | |
a313f4c5 | 101 | case 4: cset.sig[6] = set->sig[3] & 0xffffffffull; |
81e7009e SR |
102 | cset.sig[7] = set->sig[3] >> 32; |
103 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
104 | cset.sig[5] = set->sig[2] >> 32; | |
105 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
106 | cset.sig[3] = set->sig[1] >> 32; | |
107 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
108 | cset.sig[1] = set->sig[0] >> 32; | |
109 | } | |
110 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
111 | } | |
112 | ||
9b7cf8b4 PM |
113 | static inline int get_sigset_t(sigset_t *set, |
114 | const compat_sigset_t __user *uset) | |
81e7009e SR |
115 | { |
116 | compat_sigset_t s32; | |
117 | ||
118 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
119 | return -EFAULT; | |
120 | ||
121 | /* | |
122 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
123 | * in the "wrong" endian in 32-bit user storage). | |
124 | */ | |
125 | switch (_NSIG_WORDS) { | |
126 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
127 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
128 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
129 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
135 | struct old_sigaction __user *act) | |
136 | { | |
137 | compat_old_sigset_t mask; | |
138 | compat_uptr_t handler, restorer; | |
139 | ||
140 | if (get_user(handler, &act->sa_handler) || | |
141 | __get_user(restorer, &act->sa_restorer) || | |
142 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
143 | __get_user(mask, &act->sa_mask)) | |
144 | return -EFAULT; | |
145 | new_ka->sa.sa_handler = compat_ptr(handler); | |
146 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
147 | siginitset(&new_ka->sa.sa_mask, mask); | |
148 | return 0; | |
149 | } | |
150 | ||
29e646df | 151 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
152 | #define from_user_ptr(p) compat_ptr(p) |
153 | ||
154 | static inline int save_general_regs(struct pt_regs *regs, | |
155 | struct mcontext __user *frame) | |
156 | { | |
157 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
158 | int i; | |
159 | ||
1bd79336 | 160 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
161 | |
162 | for (i = 0; i <= PT_RESULT; i ++) { | |
163 | if (i == 14 && !FULL_REGS(regs)) | |
164 | i = 32; | |
81e7009e SR |
165 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
166 | return -EFAULT; | |
401d1f02 | 167 | } |
81e7009e SR |
168 | return 0; |
169 | } | |
170 | ||
171 | static inline int restore_general_regs(struct pt_regs *regs, | |
172 | struct mcontext __user *sr) | |
173 | { | |
174 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
175 | int i; | |
176 | ||
177 | for (i = 0; i <= PT_RESULT; i++) { | |
178 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
179 | continue; | |
180 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
181 | return -EFAULT; | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
186 | #else /* CONFIG_PPC64 */ | |
187 | ||
81e7009e SR |
188 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
189 | ||
190 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
191 | { | |
192 | return copy_to_user(uset, set, sizeof(*uset)); | |
193 | } | |
194 | ||
9b7cf8b4 | 195 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
196 | { |
197 | return copy_from_user(set, uset, sizeof(*uset)); | |
198 | } | |
199 | ||
200 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
201 | struct old_sigaction __user *act) | |
202 | { | |
203 | old_sigset_t mask; | |
204 | ||
205 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
206 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
43f16819 AV |
207 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer) || |
208 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
209 | __get_user(mask, &act->sa_mask)) | |
81e7009e | 210 | return -EFAULT; |
81e7009e SR |
211 | siginitset(&new_ka->sa.sa_mask, mask); |
212 | return 0; | |
213 | } | |
214 | ||
29e646df AV |
215 | #define to_user_ptr(p) ((unsigned long)(p)) |
216 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
217 | |
218 | static inline int save_general_regs(struct pt_regs *regs, | |
219 | struct mcontext __user *frame) | |
220 | { | |
1bd79336 | 221 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
222 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
223 | } | |
224 | ||
225 | static inline int restore_general_regs(struct pt_regs *regs, | |
226 | struct mcontext __user *sr) | |
227 | { | |
228 | /* copy up to but not including MSR */ | |
229 | if (__copy_from_user(regs, &sr->mc_gregs, | |
230 | PT_MSR * sizeof(elf_greg_t))) | |
231 | return -EFAULT; | |
232 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
233 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
234 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
235 | return -EFAULT; | |
236 | return 0; | |
237 | } | |
238 | ||
239 | #endif /* CONFIG_PPC64 */ | |
240 | ||
81e7009e SR |
241 | /* |
242 | * Atomically swap in the new signal mask, and wait for a signal. | |
243 | */ | |
150256d8 | 244 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 245 | { |
a2007ce8 | 246 | sigset_t blocked; |
a2007ce8 | 247 | siginitset(&blocked, mask); |
68f3f16d | 248 | return sigsuspend(&blocked); |
81e7009e SR |
249 | } |
250 | ||
81e7009e SR |
251 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
252 | struct old_sigaction __user *oact) | |
253 | { | |
254 | struct k_sigaction new_ka, old_ka; | |
255 | int ret; | |
256 | ||
257 | #ifdef CONFIG_PPC64 | |
258 | if (sig < 0) | |
259 | sig = -sig; | |
260 | #endif | |
261 | ||
262 | if (act) { | |
263 | if (get_old_sigaction(&new_ka, act)) | |
264 | return -EFAULT; | |
265 | } | |
266 | ||
267 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
268 | if (!ret && oact) { | |
269 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
270 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
271 | &oact->sa_handler) || | |
272 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
273 | &oact->sa_restorer) || | |
274 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
275 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
276 | return -EFAULT; | |
277 | } | |
278 | ||
279 | return ret; | |
280 | } | |
1da177e4 LT |
281 | |
282 | /* | |
283 | * When we have signals to deliver, we set up on the | |
284 | * user stack, going down from the original stack pointer: | |
a3f61dc0 BH |
285 | * an ABI gap of 56 words |
286 | * an mcontext struct | |
81e7009e SR |
287 | * a sigcontext struct |
288 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 289 | * |
a3f61dc0 BH |
290 | * Each of these things must be a multiple of 16 bytes in size. The following |
291 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
292 | * |
293 | */ | |
a3f61dc0 BH |
294 | struct sigframe { |
295 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 296 | struct mcontext mctx; /* all the register values */ |
1da177e4 LT |
297 | /* |
298 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
299 | * regs and 18 fp regs below sp before decrementing it. | |
300 | */ | |
301 | int abigap[56]; | |
302 | }; | |
303 | ||
304 | /* We use the mc_pad field for the signal return trampoline. */ | |
305 | #define tramp mc_pad | |
306 | ||
307 | /* | |
308 | * When we have rt signals to deliver, we set up on the | |
309 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
310 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
311 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
312 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
313 | * positions as in older kernels). |
314 | * | |
315 | * Each of these things must be a multiple of 16 bytes in size. | |
316 | * | |
317 | */ | |
81e7009e SR |
318 | struct rt_sigframe { |
319 | #ifdef CONFIG_PPC64 | |
320 | compat_siginfo_t info; | |
321 | #else | |
322 | struct siginfo info; | |
323 | #endif | |
324 | struct ucontext uc; | |
1da177e4 LT |
325 | /* |
326 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
327 | * regs and 18 fp regs below sp before decrementing it. | |
328 | */ | |
329 | int abigap[56]; | |
330 | }; | |
331 | ||
6a274c08 MN |
332 | #ifdef CONFIG_VSX |
333 | unsigned long copy_fpr_to_user(void __user *to, | |
334 | struct task_struct *task) | |
335 | { | |
336 | double buf[ELF_NFPREG]; | |
337 | int i; | |
338 | ||
339 | /* save FPR copy to local buffer then write to the thread_struct */ | |
340 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
341 | buf[i] = task->thread.TS_FPR(i); | |
342 | memcpy(&buf[i], &task->thread.fpscr, sizeof(double)); | |
343 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); | |
344 | } | |
345 | ||
346 | unsigned long copy_fpr_from_user(struct task_struct *task, | |
347 | void __user *from) | |
348 | { | |
349 | double buf[ELF_NFPREG]; | |
350 | int i; | |
351 | ||
352 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
353 | return 1; | |
354 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
355 | task->thread.TS_FPR(i) = buf[i]; | |
356 | memcpy(&task->thread.fpscr, &buf[i], sizeof(double)); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | unsigned long copy_vsx_to_user(void __user *to, | |
362 | struct task_struct *task) | |
363 | { | |
364 | double buf[ELF_NVSRHALFREG]; | |
365 | int i; | |
366 | ||
367 | /* save FPR copy to local buffer then write to the thread_struct */ | |
368 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
369 | buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET]; | |
370 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); | |
371 | } | |
372 | ||
373 | unsigned long copy_vsx_from_user(struct task_struct *task, | |
374 | void __user *from) | |
375 | { | |
376 | double buf[ELF_NVSRHALFREG]; | |
377 | int i; | |
378 | ||
379 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
380 | return 1; | |
381 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
382 | task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i]; | |
383 | return 0; | |
384 | } | |
385 | #else | |
386 | inline unsigned long copy_fpr_to_user(void __user *to, | |
387 | struct task_struct *task) | |
388 | { | |
389 | return __copy_to_user(to, task->thread.fpr, | |
390 | ELF_NFPREG * sizeof(double)); | |
391 | } | |
392 | ||
393 | inline unsigned long copy_fpr_from_user(struct task_struct *task, | |
394 | void __user *from) | |
395 | { | |
396 | return __copy_from_user(task->thread.fpr, from, | |
397 | ELF_NFPREG * sizeof(double)); | |
398 | } | |
399 | #endif | |
400 | ||
1da177e4 LT |
401 | /* |
402 | * Save the current user registers on the user stack. | |
81e7009e SR |
403 | * We only save the altivec/spe registers if the process has used |
404 | * altivec/spe instructions at some point. | |
1da177e4 | 405 | */ |
81e7009e | 406 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
16c29d18 | 407 | int sigret, int ctx_has_vsx_region) |
1da177e4 | 408 | { |
9e751186 MN |
409 | unsigned long msr = regs->msr; |
410 | ||
1da177e4 LT |
411 | /* Make sure floating point registers are stored in regs */ |
412 | flush_fp_to_thread(current); | |
413 | ||
c6e6771b MN |
414 | /* save general registers */ |
415 | if (save_general_regs(regs, frame)) | |
1da177e4 LT |
416 | return 1; |
417 | ||
1da177e4 LT |
418 | #ifdef CONFIG_ALTIVEC |
419 | /* save altivec registers */ | |
420 | if (current->thread.used_vr) { | |
421 | flush_altivec_to_thread(current); | |
422 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 423 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
424 | return 1; |
425 | /* set MSR_VEC in the saved MSR value to indicate that | |
426 | frame->mc_vregs contains valid data */ | |
9e751186 | 427 | msr |= MSR_VEC; |
1da177e4 LT |
428 | } |
429 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
430 | ||
431 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
432 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
433 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
434 | * most significant bits of that same vector. --BenH | |
435 | */ | |
436 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
437 | return 1; | |
438 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 | 439 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
c6e6771b | 440 | return 1; |
6a274c08 | 441 | #ifdef CONFIG_VSX |
ce48b210 MN |
442 | /* |
443 | * Copy VSR 0-31 upper half from thread_struct to local | |
444 | * buffer, then write that to userspace. Also set MSR_VSX in | |
445 | * the saved MSR value to indicate that frame->mc_vregs | |
446 | * contains valid data | |
447 | */ | |
16c29d18 | 448 | if (current->thread.used_vsr && ctx_has_vsx_region) { |
7c292170 | 449 | __giveup_vsx(current); |
6a274c08 | 450 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
ce48b210 MN |
451 | return 1; |
452 | msr |= MSR_VSX; | |
453 | } | |
c6e6771b | 454 | #endif /* CONFIG_VSX */ |
81e7009e SR |
455 | #ifdef CONFIG_SPE |
456 | /* save spe registers */ | |
457 | if (current->thread.used_spe) { | |
458 | flush_spe_to_thread(current); | |
459 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
460 | ELF_NEVRREG * sizeof(u32))) | |
461 | return 1; | |
462 | /* set MSR_SPE in the saved MSR value to indicate that | |
463 | frame->mc_vregs contains valid data */ | |
9e751186 | 464 | msr |= MSR_SPE; |
81e7009e SR |
465 | } |
466 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
467 | ||
468 | /* We always copy to/from spefscr */ | |
469 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
470 | return 1; | |
471 | #endif /* CONFIG_SPE */ | |
472 | ||
9e751186 MN |
473 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
474 | return 1; | |
1da177e4 LT |
475 | if (sigret) { |
476 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
477 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
478 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
479 | return 1; | |
480 | flush_icache_range((unsigned long) &frame->tramp[0], | |
481 | (unsigned long) &frame->tramp[2]); | |
482 | } | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | /* | |
488 | * Restore the current user register values from the user stack, | |
489 | * (except for MSR). | |
490 | */ | |
491 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 492 | struct mcontext __user *sr, int sig) |
1da177e4 | 493 | { |
81e7009e | 494 | long err; |
1da177e4 | 495 | unsigned int save_r2 = 0; |
1da177e4 | 496 | unsigned long msr; |
c6e6771b | 497 | #ifdef CONFIG_VSX |
c6e6771b MN |
498 | int i; |
499 | #endif | |
1da177e4 LT |
500 | |
501 | /* | |
502 | * restore general registers but not including MSR or SOFTE. Also | |
503 | * take care of keeping r2 (TLS) intact if not a signal | |
504 | */ | |
505 | if (!sig) | |
506 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 507 | err = restore_general_regs(regs, sr); |
9a81c16b | 508 | regs->trap = 0; |
fab5db97 | 509 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
510 | if (!sig) |
511 | regs->gpr[2] = (unsigned long) save_r2; | |
512 | if (err) | |
513 | return 1; | |
514 | ||
fab5db97 PM |
515 | /* if doing signal return, restore the previous little-endian mode */ |
516 | if (sig) | |
517 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
518 | ||
5388fb10 PM |
519 | /* |
520 | * Do this before updating the thread state in | |
521 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
522 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
523 | * tempted to save the current CPU state into the thread_struct | |
524 | * and corrupt what we are writing there. | |
525 | */ | |
526 | discard_lazy_cpu_state(); | |
527 | ||
1da177e4 | 528 | #ifdef CONFIG_ALTIVEC |
c6e6771b MN |
529 | /* |
530 | * Force the process to reload the altivec registers from | |
531 | * current->thread when it next does altivec instructions | |
532 | */ | |
1da177e4 | 533 | regs->msr &= ~MSR_VEC; |
fab5db97 | 534 | if (msr & MSR_VEC) { |
1da177e4 LT |
535 | /* restore altivec registers from the stack */ |
536 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
537 | sizeof(sr->mc_vregs))) | |
538 | return 1; | |
539 | } else if (current->thread.used_vr) | |
81e7009e | 540 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
541 | |
542 | /* Always get VRSAVE back */ | |
543 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
544 | return 1; | |
545 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 MN |
546 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
547 | return 1; | |
1da177e4 | 548 | |
c6e6771b | 549 | #ifdef CONFIG_VSX |
ce48b210 MN |
550 | /* |
551 | * Force the process to reload the VSX registers from | |
552 | * current->thread when it next does VSX instruction. | |
553 | */ | |
554 | regs->msr &= ~MSR_VSX; | |
555 | if (msr & MSR_VSX) { | |
556 | /* | |
557 | * Restore altivec registers from the stack to a local | |
558 | * buffer, then write this out to the thread_struct | |
559 | */ | |
6a274c08 | 560 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
ce48b210 | 561 | return 1; |
ce48b210 MN |
562 | } else if (current->thread.used_vsr) |
563 | for (i = 0; i < 32 ; i++) | |
564 | current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; | |
c6e6771b MN |
565 | #endif /* CONFIG_VSX */ |
566 | /* | |
567 | * force the process to reload the FP registers from | |
568 | * current->thread when it next does FP instructions | |
569 | */ | |
570 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
571 | ||
81e7009e SR |
572 | #ifdef CONFIG_SPE |
573 | /* force the process to reload the spe registers from | |
574 | current->thread when it next does spe instructions */ | |
575 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 576 | if (msr & MSR_SPE) { |
81e7009e SR |
577 | /* restore spe registers from the stack */ |
578 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
579 | ELF_NEVRREG * sizeof(u32))) | |
580 | return 1; | |
581 | } else if (current->thread.used_spe) | |
582 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
583 | ||
584 | /* Always get SPEFSCR back */ | |
585 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
586 | return 1; | |
587 | #endif /* CONFIG_SPE */ | |
588 | ||
1da177e4 LT |
589 | return 0; |
590 | } | |
591 | ||
81e7009e | 592 | #ifdef CONFIG_PPC64 |
b09a4913 | 593 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
594 | struct sigaction32 __user *oact, size_t sigsetsize) |
595 | { | |
596 | struct k_sigaction new_ka, old_ka; | |
597 | int ret; | |
1da177e4 LT |
598 | |
599 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
600 | if (sigsetsize != sizeof(compat_sigset_t)) | |
601 | return -EINVAL; | |
602 | ||
603 | if (act) { | |
604 | compat_uptr_t handler; | |
605 | ||
606 | ret = get_user(handler, &act->sa_handler); | |
607 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 608 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
609 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
610 | if (ret) | |
611 | return -EFAULT; | |
612 | } | |
613 | ||
614 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
615 | if (!ret && oact) { | |
29e646df | 616 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 617 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
618 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
619 | } | |
620 | return ret; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Note: it is necessary to treat how as an unsigned int, with the | |
625 | * corresponding cast to a signed int to insure that the proper | |
626 | * conversion (sign extension) between the register representation | |
627 | * of a signed int (msr in 32-bit mode) and the register representation | |
628 | * of a signed int (msr in 64-bit mode) is performed. | |
629 | */ | |
b09a4913 | 630 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
631 | compat_sigset_t __user *oset, size_t sigsetsize) |
632 | { | |
633 | sigset_t s; | |
634 | sigset_t __user *up; | |
1da177e4 LT |
635 | int ret; |
636 | mm_segment_t old_fs = get_fs(); | |
637 | ||
638 | if (set) { | |
81e7009e SR |
639 | if (get_sigset_t(&s, set)) |
640 | return -EFAULT; | |
1da177e4 | 641 | } |
81e7009e | 642 | |
1da177e4 LT |
643 | set_fs(KERNEL_DS); |
644 | /* This is valid because of the set_fs() */ | |
645 | up = (sigset_t __user *) &s; | |
646 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 647 | sigsetsize); |
1da177e4 LT |
648 | set_fs(old_fs); |
649 | if (ret) | |
650 | return ret; | |
651 | if (oset) { | |
81e7009e | 652 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
653 | return -EFAULT; |
654 | } | |
655 | return 0; | |
656 | } | |
657 | ||
b09a4913 | 658 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
659 | { |
660 | sigset_t s; | |
1da177e4 LT |
661 | int ret; |
662 | mm_segment_t old_fs = get_fs(); | |
663 | ||
664 | set_fs(KERNEL_DS); | |
665 | /* The __user pointer cast is valid because of the set_fs() */ | |
666 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
667 | set_fs(old_fs); | |
668 | if (!ret) { | |
81e7009e | 669 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
670 | return -EFAULT; |
671 | } | |
672 | return ret; | |
673 | } | |
674 | ||
675 | ||
676 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
677 | { | |
678 | int err; | |
679 | ||
680 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
681 | return -EFAULT; | |
682 | ||
683 | /* If you change siginfo_t structure, please be sure | |
684 | * this code is fixed accordingly. | |
685 | * It should never copy any pad contained in the structure | |
686 | * to avoid security leaks, but must copy the generic | |
687 | * 3 ints plus the relevant union member. | |
688 | * This routine must convert siginfo from 64bit to 32bit as well | |
689 | * at the same time. | |
690 | */ | |
691 | err = __put_user(s->si_signo, &d->si_signo); | |
692 | err |= __put_user(s->si_errno, &d->si_errno); | |
693 | err |= __put_user((short)s->si_code, &d->si_code); | |
694 | if (s->si_code < 0) | |
695 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
696 | SI_PAD_SIZE32); | |
697 | else switch(s->si_code >> 16) { | |
698 | case __SI_CHLD >> 16: | |
699 | err |= __put_user(s->si_pid, &d->si_pid); | |
700 | err |= __put_user(s->si_uid, &d->si_uid); | |
701 | err |= __put_user(s->si_utime, &d->si_utime); | |
702 | err |= __put_user(s->si_stime, &d->si_stime); | |
703 | err |= __put_user(s->si_status, &d->si_status); | |
704 | break; | |
705 | case __SI_FAULT >> 16: | |
706 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
707 | &d->si_addr); | |
708 | break; | |
709 | case __SI_POLL >> 16: | |
710 | err |= __put_user(s->si_band, &d->si_band); | |
711 | err |= __put_user(s->si_fd, &d->si_fd); | |
712 | break; | |
713 | case __SI_TIMER >> 16: | |
714 | err |= __put_user(s->si_tid, &d->si_tid); | |
715 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
716 | err |= __put_user(s->si_int, &d->si_int); | |
717 | break; | |
718 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
719 | case __SI_MESGQ >> 16: | |
720 | err |= __put_user(s->si_int, &d->si_int); | |
721 | /* fallthrough */ | |
722 | case __SI_KILL >> 16: | |
723 | default: | |
724 | err |= __put_user(s->si_pid, &d->si_pid); | |
725 | err |= __put_user(s->si_uid, &d->si_uid); | |
726 | break; | |
727 | } | |
728 | return err; | |
729 | } | |
730 | ||
81e7009e SR |
731 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
732 | ||
9c0c44db RM |
733 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
734 | { | |
735 | memset(to, 0, sizeof *to); | |
736 | ||
737 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
738 | copy_from_user(to->_sifields._pad, | |
739 | from->_sifields._pad, SI_PAD_SIZE32)) | |
740 | return -EFAULT; | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
747 | * corresponding cast to a signed int to insure that the proper conversion | |
748 | * (sign extension) between the register representation of a signed int | |
749 | * (msr in 32-bit mode) and the register representation of a signed int | |
750 | * (msr in 64-bit mode) is performed. | |
751 | */ | |
b09a4913 | 752 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
753 | { |
754 | siginfo_t info; | |
755 | int ret; | |
756 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 757 | |
9c0c44db RM |
758 | ret = copy_siginfo_from_user32(&info, uinfo); |
759 | if (unlikely(ret)) | |
760 | return ret; | |
761 | ||
1da177e4 LT |
762 | set_fs (KERNEL_DS); |
763 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
764 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
765 | set_fs (old_fs); | |
766 | return ret; | |
767 | } | |
1da177e4 LT |
768 | /* |
769 | * Start Alternate signal stack support | |
770 | * | |
771 | * System Calls | |
b09a4913 | 772 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
773 | */ |
774 | ||
b09a4913 | 775 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
776 | int r6, int r7, int r8, struct pt_regs *regs) |
777 | { | |
29e646df AV |
778 | stack_32_t __user * newstack = compat_ptr(__new); |
779 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
780 | stack_t uss, uoss; |
781 | int ret; | |
782 | mm_segment_t old_fs; | |
783 | unsigned long sp; | |
784 | compat_uptr_t ss_sp; | |
785 | ||
786 | /* | |
787 | * set sp to the user stack on entry to the system call | |
788 | * the system call router sets R9 to the saved registers | |
789 | */ | |
790 | sp = regs->gpr[1]; | |
791 | ||
792 | /* Put new stack info in local 64 bit stack struct */ | |
793 | if (newstack) { | |
794 | if (get_user(ss_sp, &newstack->ss_sp) || | |
795 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
796 | __get_user(uss.ss_size, &newstack->ss_size)) | |
797 | return -EFAULT; | |
798 | uss.ss_sp = compat_ptr(ss_sp); | |
799 | } | |
800 | ||
801 | old_fs = get_fs(); | |
802 | set_fs(KERNEL_DS); | |
803 | /* The __user pointer casts are valid because of the set_fs() */ | |
804 | ret = do_sigaltstack( | |
805 | newstack ? (stack_t __user *) &uss : NULL, | |
806 | oldstack ? (stack_t __user *) &uoss : NULL, | |
807 | sp); | |
808 | set_fs(old_fs); | |
809 | /* Copy the stack information to the user output buffer */ | |
810 | if (!ret && oldstack && | |
29e646df | 811 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
812 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
813 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
814 | return -EFAULT; | |
815 | return ret; | |
816 | } | |
81e7009e | 817 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 818 | |
1da177e4 LT |
819 | /* |
820 | * Set up a signal frame for a "real-time" signal handler | |
821 | * (one which gets siginfo). | |
822 | */ | |
f478f543 | 823 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e | 824 | siginfo_t *info, sigset_t *oldset, |
a3f61dc0 | 825 | struct pt_regs *regs) |
1da177e4 | 826 | { |
81e7009e SR |
827 | struct rt_sigframe __user *rt_sf; |
828 | struct mcontext __user *frame; | |
d0c3d534 | 829 | void __user *addr; |
a3f61dc0 | 830 | unsigned long newsp = 0; |
1da177e4 LT |
831 | |
832 | /* Set up Signal Frame */ | |
833 | /* Put a Real Time Context onto stack */ | |
efbda860 | 834 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1); |
d0c3d534 | 835 | addr = rt_sf; |
a3f61dc0 | 836 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
837 | goto badframe; |
838 | ||
1da177e4 | 839 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 840 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
841 | || __put_user(0, &rt_sf->uc.uc_flags) |
842 | || __put_user(0, &rt_sf->uc.uc_link) | |
843 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
844 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
845 | &rt_sf->uc.uc_stack.ss_flags) | |
846 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
847 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
848 | &rt_sf->uc.uc_regs) | |
849 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
850 | goto badframe; |
851 | ||
852 | /* Save user registers on the stack */ | |
853 | frame = &rt_sf->uc.uc_mcontext; | |
d0c3d534 | 854 | addr = frame; |
a5bba930 | 855 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
16c29d18 | 856 | if (save_user_regs(regs, frame, 0, 1)) |
1da177e4 | 857 | goto badframe; |
a5bba930 | 858 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 859 | } else { |
16c29d18 | 860 | if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1)) |
1da177e4 LT |
861 | goto badframe; |
862 | regs->link = (unsigned long) frame->tramp; | |
863 | } | |
cc657f53 PM |
864 | |
865 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
866 | ||
a3f61dc0 BH |
867 | /* create a stack frame for the caller of the handler */ |
868 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 869 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 870 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 871 | goto badframe; |
a3f61dc0 BH |
872 | |
873 | /* Fill registers for signal handler */ | |
81e7009e | 874 | regs->gpr[1] = newsp; |
1da177e4 LT |
875 | regs->gpr[3] = sig; |
876 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
877 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
878 | regs->gpr[6] = (unsigned long) rt_sf; | |
879 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
880 | /* enter the signal handler in big-endian mode */ |
881 | regs->msr &= ~MSR_LE; | |
1da177e4 LT |
882 | return 1; |
883 | ||
884 | badframe: | |
81e7009e | 885 | #ifdef DEBUG_SIG |
1da177e4 LT |
886 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
887 | regs, frame, newsp); | |
888 | #endif | |
76462232 CD |
889 | if (show_unhandled_signals) |
890 | printk_ratelimited(KERN_INFO | |
891 | "%s[%d]: bad frame in handle_rt_signal32: " | |
892 | "%p nip %08lx lr %08lx\n", | |
893 | current->comm, current->pid, | |
894 | addr, regs->nip, regs->link); | |
d0c3d534 | 895 | |
1da177e4 LT |
896 | force_sigsegv(sig, current); |
897 | return 0; | |
898 | } | |
899 | ||
81e7009e | 900 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 901 | { |
1da177e4 | 902 | sigset_t set; |
81e7009e SR |
903 | struct mcontext __user *mcp; |
904 | ||
905 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
906 | return -EFAULT; | |
907 | #ifdef CONFIG_PPC64 | |
908 | { | |
909 | u32 cmcp; | |
1da177e4 | 910 | |
81e7009e SR |
911 | if (__get_user(cmcp, &ucp->uc_regs)) |
912 | return -EFAULT; | |
913 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 914 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
915 | } |
916 | #else | |
917 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 918 | return -EFAULT; |
7c85d1f9 PM |
919 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
920 | return -EFAULT; | |
81e7009e | 921 | #endif |
1da177e4 | 922 | restore_sigmask(&set); |
81e7009e | 923 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
924 | return -EFAULT; |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
81e7009e | 929 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
930 | struct ucontext __user *new_ctx, |
931 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
932 | { |
933 | unsigned char tmp; | |
16c29d18 | 934 | int ctx_has_vsx_region = 0; |
1da177e4 | 935 | |
c1cb299e MN |
936 | #ifdef CONFIG_PPC64 |
937 | unsigned long new_msr = 0; | |
938 | ||
77eb50ae AS |
939 | if (new_ctx) { |
940 | struct mcontext __user *mcp; | |
941 | u32 cmcp; | |
942 | ||
943 | /* | |
944 | * Get pointer to the real mcontext. No need for | |
945 | * access_ok since we are dealing with compat | |
946 | * pointers. | |
947 | */ | |
948 | if (__get_user(cmcp, &new_ctx->uc_regs)) | |
949 | return -EFAULT; | |
950 | mcp = (struct mcontext __user *)(u64)cmcp; | |
951 | if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) | |
952 | return -EFAULT; | |
953 | } | |
c1cb299e MN |
954 | /* |
955 | * Check that the context is not smaller than the original | |
956 | * size (with VMX but without VSX) | |
957 | */ | |
958 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) | |
959 | return -EINVAL; | |
960 | /* | |
961 | * If the new context state sets the MSR VSX bits but | |
962 | * it doesn't provide VSX state. | |
963 | */ | |
964 | if ((ctx_size < sizeof(struct ucontext)) && | |
965 | (new_msr & MSR_VSX)) | |
966 | return -EINVAL; | |
16c29d18 MN |
967 | /* Does the context have enough room to store VSX data? */ |
968 | if (ctx_size >= sizeof(struct ucontext)) | |
969 | ctx_has_vsx_region = 1; | |
c1cb299e | 970 | #else |
1da177e4 LT |
971 | /* Context size is for future use. Right now, we only make sure |
972 | * we are passed something we understand | |
973 | */ | |
81e7009e | 974 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 | 975 | return -EINVAL; |
c1cb299e | 976 | #endif |
1da177e4 | 977 | if (old_ctx != NULL) { |
1c9bb1a0 PM |
978 | struct mcontext __user *mctx; |
979 | ||
980 | /* | |
981 | * old_ctx might not be 16-byte aligned, in which | |
982 | * case old_ctx->uc_mcontext won't be either. | |
983 | * Because we have the old_ctx->uc_pad2 field | |
984 | * before old_ctx->uc_mcontext, we need to round down | |
985 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
986 | */ | |
987 | mctx = (struct mcontext __user *) | |
988 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
16c29d18 MN |
989 | if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) |
990 | || save_user_regs(regs, mctx, 0, ctx_has_vsx_region) | |
81e7009e | 991 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 992 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
993 | return -EFAULT; |
994 | } | |
995 | if (new_ctx == NULL) | |
996 | return 0; | |
16c29d18 | 997 | if (!access_ok(VERIFY_READ, new_ctx, ctx_size) |
1da177e4 | 998 | || __get_user(tmp, (u8 __user *) new_ctx) |
16c29d18 | 999 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
1da177e4 LT |
1000 | return -EFAULT; |
1001 | ||
1002 | /* | |
1003 | * If we get a fault copying the context into the kernel's | |
1004 | * image of the user's registers, we can't just return -EFAULT | |
1005 | * because the user's registers will be corrupted. For instance | |
1006 | * the NIP value may have been updated but not some of the | |
1007 | * other registers. Given that we have done the access_ok | |
1008 | * and successfully read the first and last bytes of the region | |
1009 | * above, this should only happen in an out-of-memory situation | |
1010 | * or if another thread unmaps the region containing the context. | |
1011 | * We kill the task with a SIGSEGV in this situation. | |
1012 | */ | |
81e7009e | 1013 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 1014 | do_exit(SIGSEGV); |
401d1f02 DW |
1015 | |
1016 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
1017 | return 0; |
1018 | } | |
1019 | ||
81e7009e | 1020 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1021 | struct pt_regs *regs) |
1022 | { | |
81e7009e | 1023 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
1024 | |
1025 | /* Always make any pending restarted system calls return -EINTR */ | |
1026 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1027 | ||
81e7009e SR |
1028 | rt_sf = (struct rt_sigframe __user *) |
1029 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
1030 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
1031 | goto bad; | |
81e7009e | 1032 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
1033 | goto bad; |
1034 | ||
1035 | /* | |
1036 | * It's not clear whether or why it is desirable to save the | |
1037 | * sigaltstack setting on signal delivery and restore it on | |
1038 | * signal return. But other architectures do this and we have | |
1039 | * always done it up until now so it is probably better not to | |
1040 | * change it. -- paulus | |
81e7009e SR |
1041 | */ |
1042 | #ifdef CONFIG_PPC64 | |
1043 | /* | |
b09a4913 | 1044 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
1045 | * and takes userland pointer directly. What about error checking ? |
1046 | * nobody does any... | |
1047 | */ | |
b09a4913 | 1048 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
1049 | #else |
1050 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 1051 | #endif |
401d1f02 DW |
1052 | set_thread_flag(TIF_RESTOREALL); |
1053 | return 0; | |
1da177e4 LT |
1054 | |
1055 | bad: | |
76462232 CD |
1056 | if (show_unhandled_signals) |
1057 | printk_ratelimited(KERN_INFO | |
1058 | "%s[%d]: bad frame in sys_rt_sigreturn: " | |
1059 | "%p nip %08lx lr %08lx\n", | |
1060 | current->comm, current->pid, | |
1061 | rt_sf, regs->nip, regs->link); | |
d0c3d534 | 1062 | |
1da177e4 LT |
1063 | force_sig(SIGSEGV, current); |
1064 | return 0; | |
1065 | } | |
1066 | ||
81e7009e SR |
1067 | #ifdef CONFIG_PPC32 |
1068 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
1069 | int ndbg, struct sig_dbg_op __user *dbg, | |
1070 | int r6, int r7, int r8, | |
1071 | struct pt_regs *regs) | |
1072 | { | |
1073 | struct sig_dbg_op op; | |
1074 | int i; | |
7c85d1f9 | 1075 | unsigned char tmp; |
81e7009e | 1076 | unsigned long new_msr = regs->msr; |
172ae2e7 | 1077 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1078 | unsigned long new_dbcr0 = current->thread.dbcr0; |
1079 | #endif | |
1080 | ||
1081 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 1082 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
1083 | return -EFAULT; |
1084 | switch (op.dbg_type) { | |
1085 | case SIG_DBG_SINGLE_STEPPING: | |
172ae2e7 | 1086 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1087 | if (op.dbg_value) { |
1088 | new_msr |= MSR_DE; | |
1089 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
1090 | } else { | |
3bffb652 DK |
1091 | new_dbcr0 &= ~DBCR0_IC; |
1092 | if (!DBCR_ACTIVE_EVENTS(new_dbcr0, | |
1093 | current->thread.dbcr1)) { | |
1094 | new_msr &= ~MSR_DE; | |
1095 | new_dbcr0 &= ~DBCR0_IDM; | |
1096 | } | |
81e7009e SR |
1097 | } |
1098 | #else | |
1099 | if (op.dbg_value) | |
1100 | new_msr |= MSR_SE; | |
1101 | else | |
1102 | new_msr &= ~MSR_SE; | |
1103 | #endif | |
1104 | break; | |
1105 | case SIG_DBG_BRANCH_TRACING: | |
172ae2e7 | 1106 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1107 | return -EINVAL; |
1108 | #else | |
1109 | if (op.dbg_value) | |
1110 | new_msr |= MSR_BE; | |
1111 | else | |
1112 | new_msr &= ~MSR_BE; | |
1113 | #endif | |
1114 | break; | |
1115 | ||
1116 | default: | |
1117 | return -EINVAL; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* We wait until here to actually install the values in the | |
1122 | registers so if we fail in the above loop, it will not | |
1123 | affect the contents of these registers. After this point, | |
1124 | failure is a problem, anyway, and it's very unlikely unless | |
1125 | the user is really doing something wrong. */ | |
1126 | regs->msr = new_msr; | |
172ae2e7 | 1127 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1128 | current->thread.dbcr0 = new_dbcr0; |
1129 | #endif | |
1130 | ||
7c85d1f9 PM |
1131 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
1132 | || __get_user(tmp, (u8 __user *) ctx) | |
1133 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
1134 | return -EFAULT; | |
1135 | ||
81e7009e SR |
1136 | /* |
1137 | * If we get a fault copying the context into the kernel's | |
1138 | * image of the user's registers, we can't just return -EFAULT | |
1139 | * because the user's registers will be corrupted. For instance | |
1140 | * the NIP value may have been updated but not some of the | |
1141 | * other registers. Given that we have done the access_ok | |
1142 | * and successfully read the first and last bytes of the region | |
1143 | * above, this should only happen in an out-of-memory situation | |
1144 | * or if another thread unmaps the region containing the context. | |
1145 | * We kill the task with a SIGSEGV in this situation. | |
1146 | */ | |
1147 | if (do_setcontext(ctx, regs, 1)) { | |
76462232 CD |
1148 | if (show_unhandled_signals) |
1149 | printk_ratelimited(KERN_INFO "%s[%d]: bad frame in " | |
1150 | "sys_debug_setcontext: %p nip %08lx " | |
1151 | "lr %08lx\n", | |
1152 | current->comm, current->pid, | |
1153 | ctx, regs->nip, regs->link); | |
d0c3d534 | 1154 | |
81e7009e SR |
1155 | force_sig(SIGSEGV, current); |
1156 | goto out; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * It's not clear whether or why it is desirable to save the | |
1161 | * sigaltstack setting on signal delivery and restore it on | |
1162 | * signal return. But other architectures do this and we have | |
1163 | * always done it up until now so it is probably better not to | |
1164 | * change it. -- paulus | |
1165 | */ | |
1166 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1167 | ||
401d1f02 | 1168 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1169 | out: |
1170 | return 0; | |
1171 | } | |
1172 | #endif | |
1da177e4 LT |
1173 | |
1174 | /* | |
1175 | * OK, we're invoking a handler | |
1176 | */ | |
f478f543 | 1177 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
a3f61dc0 | 1178 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 1179 | { |
81e7009e | 1180 | struct sigcontext __user *sc; |
a3f61dc0 BH |
1181 | struct sigframe __user *frame; |
1182 | unsigned long newsp = 0; | |
1da177e4 LT |
1183 | |
1184 | /* Set up Signal Frame */ | |
efbda860 | 1185 | frame = get_sigframe(ka, regs, sizeof(*frame), 1); |
a3f61dc0 | 1186 | if (unlikely(frame == NULL)) |
1da177e4 | 1187 | goto badframe; |
a3f61dc0 | 1188 | sc = (struct sigcontext __user *) &frame->sctx; |
1da177e4 LT |
1189 | |
1190 | #if _NSIG != 64 | |
81e7009e | 1191 | #error "Please adjust handle_signal()" |
1da177e4 | 1192 | #endif |
81e7009e | 1193 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1194 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1195 | #ifdef CONFIG_PPC64 |
1da177e4 | 1196 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1197 | #else |
1198 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1199 | #endif | |
a3f61dc0 | 1200 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
1da177e4 LT |
1201 | || __put_user(sig, &sc->signal)) |
1202 | goto badframe; | |
1203 | ||
a5bba930 | 1204 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
16c29d18 | 1205 | if (save_user_regs(regs, &frame->mctx, 0, 1)) |
1da177e4 | 1206 | goto badframe; |
a5bba930 | 1207 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1208 | } else { |
16c29d18 | 1209 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1)) |
1da177e4 LT |
1210 | goto badframe; |
1211 | regs->link = (unsigned long) frame->mctx.tramp; | |
1212 | } | |
1213 | ||
cc657f53 PM |
1214 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1215 | ||
a3f61dc0 BH |
1216 | /* create a stack frame for the caller of the handler */ |
1217 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; | |
9747dd6f | 1218 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1219 | goto badframe; |
a3f61dc0 | 1220 | |
81e7009e | 1221 | regs->gpr[1] = newsp; |
1da177e4 LT |
1222 | regs->gpr[3] = sig; |
1223 | regs->gpr[4] = (unsigned long) sc; | |
1224 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1225 | /* enter the signal handler in big-endian mode */ |
1226 | regs->msr &= ~MSR_LE; | |
1da177e4 LT |
1227 | |
1228 | return 1; | |
1229 | ||
1230 | badframe: | |
81e7009e SR |
1231 | #ifdef DEBUG_SIG |
1232 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1233 | regs, frame, newsp); | |
1da177e4 | 1234 | #endif |
76462232 CD |
1235 | if (show_unhandled_signals) |
1236 | printk_ratelimited(KERN_INFO | |
1237 | "%s[%d]: bad frame in handle_signal32: " | |
1238 | "%p nip %08lx lr %08lx\n", | |
1239 | current->comm, current->pid, | |
1240 | frame, regs->nip, regs->link); | |
d0c3d534 | 1241 | |
1da177e4 LT |
1242 | force_sigsegv(sig, current); |
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Do a signal return; undo the signal stack. | |
1248 | */ | |
81e7009e | 1249 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1250 | struct pt_regs *regs) |
1251 | { | |
81e7009e SR |
1252 | struct sigcontext __user *sc; |
1253 | struct sigcontext sigctx; | |
1254 | struct mcontext __user *sr; | |
d0c3d534 | 1255 | void __user *addr; |
1da177e4 | 1256 | sigset_t set; |
1da177e4 LT |
1257 | |
1258 | /* Always make any pending restarted system calls return -EINTR */ | |
1259 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1260 | ||
81e7009e | 1261 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
d0c3d534 | 1262 | addr = sc; |
1da177e4 LT |
1263 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1264 | goto badframe; | |
1265 | ||
81e7009e | 1266 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1267 | /* |
1268 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1269 | * unused part of the signal stackframe | |
1270 | */ | |
1271 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1272 | #else |
1273 | set.sig[0] = sigctx.oldmask; | |
1274 | set.sig[1] = sigctx._unused[3]; | |
1275 | #endif | |
1da177e4 LT |
1276 | restore_sigmask(&set); |
1277 | ||
81e7009e | 1278 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
d0c3d534 | 1279 | addr = sr; |
1da177e4 LT |
1280 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1281 | || restore_user_regs(regs, sr, 1)) | |
1282 | goto badframe; | |
1283 | ||
401d1f02 | 1284 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1285 | return 0; |
1da177e4 LT |
1286 | |
1287 | badframe: | |
76462232 CD |
1288 | if (show_unhandled_signals) |
1289 | printk_ratelimited(KERN_INFO | |
1290 | "%s[%d]: bad frame in sys_sigreturn: " | |
1291 | "%p nip %08lx lr %08lx\n", | |
1292 | current->comm, current->pid, | |
1293 | addr, regs->nip, regs->link); | |
d0c3d534 | 1294 | |
1da177e4 LT |
1295 | force_sig(SIGSEGV, current); |
1296 | return 0; | |
1297 | } |