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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> |
81e7009e | 46 | #ifdef CONFIG_PPC64 |
879168ee | 47 | #include "ppc32.h" |
1da177e4 | 48 | #include <asm/unistd.h> |
81e7009e SR |
49 | #else |
50 | #include <asm/ucontext.h> | |
51 | #include <asm/pgtable.h> | |
52 | #endif | |
1da177e4 | 53 | |
22e38f29 BH |
54 | #include "signal.h" |
55 | ||
81e7009e | 56 | #undef DEBUG_SIG |
1da177e4 | 57 | |
81e7009e | 58 | #ifdef CONFIG_PPC64 |
b09a4913 SR |
59 | #define sys_sigsuspend compat_sys_sigsuspend |
60 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
61 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
62 | #define sys_sigaction compat_sys_sigaction | |
63 | #define sys_swapcontext compat_sys_swapcontext | |
64 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
65 | |
66 | #define old_sigaction old_sigaction32 | |
67 | #define sigcontext sigcontext32 | |
68 | #define mcontext mcontext32 | |
69 | #define ucontext ucontext32 | |
70 | ||
c1cb299e MN |
71 | /* |
72 | * Userspace code may pass a ucontext which doesn't include VSX added | |
73 | * at the end. We need to check for this case. | |
74 | */ | |
75 | #define UCONTEXTSIZEWITHOUTVSX \ | |
76 | (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) | |
77 | ||
81e7009e SR |
78 | /* |
79 | * Returning 0 means we return to userspace via | |
80 | * ret_from_except and thus restore all user | |
81 | * registers from *regs. This is what we need | |
82 | * to do when a signal has been delivered. | |
83 | */ | |
81e7009e SR |
84 | |
85 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
86 | #undef __SIGNAL_FRAMESIZE | |
87 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
88 | #undef ELF_NVRREG | |
89 | #define ELF_NVRREG ELF_NVRREG32 | |
90 | ||
91 | /* | |
92 | * Functions for flipping sigsets (thanks to brain dead generic | |
93 | * implementation that makes things simple for little endian only) | |
94 | */ | |
95 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
96 | { | |
97 | compat_sigset_t cset; | |
98 | ||
99 | switch (_NSIG_WORDS) { | |
a313f4c5 | 100 | case 4: cset.sig[6] = set->sig[3] & 0xffffffffull; |
81e7009e SR |
101 | cset.sig[7] = set->sig[3] >> 32; |
102 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
103 | cset.sig[5] = set->sig[2] >> 32; | |
104 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
105 | cset.sig[3] = set->sig[1] >> 32; | |
106 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
107 | cset.sig[1] = set->sig[0] >> 32; | |
108 | } | |
109 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
110 | } | |
111 | ||
9b7cf8b4 PM |
112 | static inline int get_sigset_t(sigset_t *set, |
113 | const compat_sigset_t __user *uset) | |
81e7009e SR |
114 | { |
115 | compat_sigset_t s32; | |
116 | ||
117 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
118 | return -EFAULT; | |
119 | ||
120 | /* | |
121 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
122 | * in the "wrong" endian in 32-bit user storage). | |
123 | */ | |
124 | switch (_NSIG_WORDS) { | |
125 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
126 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
127 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
128 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
129 | } | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
134 | struct old_sigaction __user *act) | |
135 | { | |
136 | compat_old_sigset_t mask; | |
137 | compat_uptr_t handler, restorer; | |
138 | ||
139 | if (get_user(handler, &act->sa_handler) || | |
140 | __get_user(restorer, &act->sa_restorer) || | |
141 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
142 | __get_user(mask, &act->sa_mask)) | |
143 | return -EFAULT; | |
144 | new_ka->sa.sa_handler = compat_ptr(handler); | |
145 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
146 | siginitset(&new_ka->sa.sa_mask, mask); | |
147 | return 0; | |
148 | } | |
149 | ||
29e646df | 150 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
151 | #define from_user_ptr(p) compat_ptr(p) |
152 | ||
153 | static inline int save_general_regs(struct pt_regs *regs, | |
154 | struct mcontext __user *frame) | |
155 | { | |
156 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
157 | int i; | |
158 | ||
1bd79336 | 159 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
160 | |
161 | for (i = 0; i <= PT_RESULT; i ++) { | |
162 | if (i == 14 && !FULL_REGS(regs)) | |
163 | i = 32; | |
81e7009e SR |
164 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
165 | return -EFAULT; | |
401d1f02 | 166 | } |
81e7009e SR |
167 | return 0; |
168 | } | |
169 | ||
170 | static inline int restore_general_regs(struct pt_regs *regs, | |
171 | struct mcontext __user *sr) | |
172 | { | |
173 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
174 | int i; | |
175 | ||
176 | for (i = 0; i <= PT_RESULT; i++) { | |
177 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
178 | continue; | |
179 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
180 | return -EFAULT; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | #else /* CONFIG_PPC64 */ | |
186 | ||
81e7009e SR |
187 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
188 | ||
189 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
190 | { | |
191 | return copy_to_user(uset, set, sizeof(*uset)); | |
192 | } | |
193 | ||
9b7cf8b4 | 194 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
195 | { |
196 | return copy_from_user(set, uset, sizeof(*uset)); | |
197 | } | |
198 | ||
199 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
200 | struct old_sigaction __user *act) | |
201 | { | |
202 | old_sigset_t mask; | |
203 | ||
204 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
205 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
206 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
207 | return -EFAULT; | |
208 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
209 | __get_user(mask, &act->sa_mask); | |
210 | siginitset(&new_ka->sa.sa_mask, mask); | |
211 | return 0; | |
212 | } | |
213 | ||
29e646df AV |
214 | #define to_user_ptr(p) ((unsigned long)(p)) |
215 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
216 | |
217 | static inline int save_general_regs(struct pt_regs *regs, | |
218 | struct mcontext __user *frame) | |
219 | { | |
1bd79336 | 220 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
221 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
222 | } | |
223 | ||
224 | static inline int restore_general_regs(struct pt_regs *regs, | |
225 | struct mcontext __user *sr) | |
226 | { | |
227 | /* copy up to but not including MSR */ | |
228 | if (__copy_from_user(regs, &sr->mc_gregs, | |
229 | PT_MSR * sizeof(elf_greg_t))) | |
230 | return -EFAULT; | |
231 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
232 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
233 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
234 | return -EFAULT; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | #endif /* CONFIG_PPC64 */ | |
239 | ||
81e7009e SR |
240 | /* |
241 | * Atomically swap in the new signal mask, and wait for a signal. | |
242 | */ | |
150256d8 | 243 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 244 | { |
a2007ce8 MF |
245 | sigset_t blocked; |
246 | ||
4a41cdf9 | 247 | current->saved_sigmask = current->blocked; |
a2007ce8 MF |
248 | |
249 | mask &= _BLOCKABLE; | |
250 | siginitset(&blocked, mask); | |
251 | set_current_blocked(&blocked); | |
81e7009e | 252 | |
150256d8 DW |
253 | current->state = TASK_INTERRUPTIBLE; |
254 | schedule(); | |
7a10174e | 255 | set_restore_sigmask(); |
150256d8 | 256 | return -ERESTARTNOHAND; |
81e7009e SR |
257 | } |
258 | ||
81e7009e SR |
259 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
260 | struct old_sigaction __user *oact) | |
261 | { | |
262 | struct k_sigaction new_ka, old_ka; | |
263 | int ret; | |
264 | ||
265 | #ifdef CONFIG_PPC64 | |
266 | if (sig < 0) | |
267 | sig = -sig; | |
268 | #endif | |
269 | ||
270 | if (act) { | |
271 | if (get_old_sigaction(&new_ka, act)) | |
272 | return -EFAULT; | |
273 | } | |
274 | ||
275 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
276 | if (!ret && oact) { | |
277 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
278 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
279 | &oact->sa_handler) || | |
280 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
281 | &oact->sa_restorer) || | |
282 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
283 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
284 | return -EFAULT; | |
285 | } | |
286 | ||
287 | return ret; | |
288 | } | |
1da177e4 LT |
289 | |
290 | /* | |
291 | * When we have signals to deliver, we set up on the | |
292 | * user stack, going down from the original stack pointer: | |
a3f61dc0 BH |
293 | * an ABI gap of 56 words |
294 | * an mcontext struct | |
81e7009e SR |
295 | * a sigcontext struct |
296 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 297 | * |
a3f61dc0 BH |
298 | * Each of these things must be a multiple of 16 bytes in size. The following |
299 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
300 | * |
301 | */ | |
a3f61dc0 BH |
302 | struct sigframe { |
303 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 304 | struct mcontext mctx; /* all the register values */ |
1da177e4 LT |
305 | /* |
306 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
307 | * regs and 18 fp regs below sp before decrementing it. | |
308 | */ | |
309 | int abigap[56]; | |
310 | }; | |
311 | ||
312 | /* We use the mc_pad field for the signal return trampoline. */ | |
313 | #define tramp mc_pad | |
314 | ||
315 | /* | |
316 | * When we have rt signals to deliver, we set up on the | |
317 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
318 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
319 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
320 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
321 | * positions as in older kernels). |
322 | * | |
323 | * Each of these things must be a multiple of 16 bytes in size. | |
324 | * | |
325 | */ | |
81e7009e SR |
326 | struct rt_sigframe { |
327 | #ifdef CONFIG_PPC64 | |
328 | compat_siginfo_t info; | |
329 | #else | |
330 | struct siginfo info; | |
331 | #endif | |
332 | struct ucontext uc; | |
1da177e4 LT |
333 | /* |
334 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
335 | * regs and 18 fp regs below sp before decrementing it. | |
336 | */ | |
337 | int abigap[56]; | |
338 | }; | |
339 | ||
6a274c08 MN |
340 | #ifdef CONFIG_VSX |
341 | unsigned long copy_fpr_to_user(void __user *to, | |
342 | struct task_struct *task) | |
343 | { | |
344 | double buf[ELF_NFPREG]; | |
345 | int i; | |
346 | ||
347 | /* save FPR copy to local buffer then write to the thread_struct */ | |
348 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
349 | buf[i] = task->thread.TS_FPR(i); | |
350 | memcpy(&buf[i], &task->thread.fpscr, sizeof(double)); | |
351 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); | |
352 | } | |
353 | ||
354 | unsigned long copy_fpr_from_user(struct task_struct *task, | |
355 | void __user *from) | |
356 | { | |
357 | double buf[ELF_NFPREG]; | |
358 | int i; | |
359 | ||
360 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
361 | return 1; | |
362 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
363 | task->thread.TS_FPR(i) = buf[i]; | |
364 | memcpy(&task->thread.fpscr, &buf[i], sizeof(double)); | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | unsigned long copy_vsx_to_user(void __user *to, | |
370 | struct task_struct *task) | |
371 | { | |
372 | double buf[ELF_NVSRHALFREG]; | |
373 | int i; | |
374 | ||
375 | /* save FPR copy to local buffer then write to the thread_struct */ | |
376 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
377 | buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET]; | |
378 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); | |
379 | } | |
380 | ||
381 | unsigned long copy_vsx_from_user(struct task_struct *task, | |
382 | void __user *from) | |
383 | { | |
384 | double buf[ELF_NVSRHALFREG]; | |
385 | int i; | |
386 | ||
387 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
388 | return 1; | |
389 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
390 | task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i]; | |
391 | return 0; | |
392 | } | |
393 | #else | |
394 | inline unsigned long copy_fpr_to_user(void __user *to, | |
395 | struct task_struct *task) | |
396 | { | |
397 | return __copy_to_user(to, task->thread.fpr, | |
398 | ELF_NFPREG * sizeof(double)); | |
399 | } | |
400 | ||
401 | inline unsigned long copy_fpr_from_user(struct task_struct *task, | |
402 | void __user *from) | |
403 | { | |
404 | return __copy_from_user(task->thread.fpr, from, | |
405 | ELF_NFPREG * sizeof(double)); | |
406 | } | |
407 | #endif | |
408 | ||
1da177e4 LT |
409 | /* |
410 | * Save the current user registers on the user stack. | |
81e7009e SR |
411 | * We only save the altivec/spe registers if the process has used |
412 | * altivec/spe instructions at some point. | |
1da177e4 | 413 | */ |
81e7009e | 414 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
16c29d18 | 415 | int sigret, int ctx_has_vsx_region) |
1da177e4 | 416 | { |
9e751186 MN |
417 | unsigned long msr = regs->msr; |
418 | ||
1da177e4 LT |
419 | /* Make sure floating point registers are stored in regs */ |
420 | flush_fp_to_thread(current); | |
421 | ||
c6e6771b MN |
422 | /* save general registers */ |
423 | if (save_general_regs(regs, frame)) | |
1da177e4 LT |
424 | return 1; |
425 | ||
1da177e4 LT |
426 | #ifdef CONFIG_ALTIVEC |
427 | /* save altivec registers */ | |
428 | if (current->thread.used_vr) { | |
429 | flush_altivec_to_thread(current); | |
430 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 431 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
432 | return 1; |
433 | /* set MSR_VEC in the saved MSR value to indicate that | |
434 | frame->mc_vregs contains valid data */ | |
9e751186 | 435 | msr |= MSR_VEC; |
1da177e4 LT |
436 | } |
437 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
438 | ||
439 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
440 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
441 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
442 | * most significant bits of that same vector. --BenH | |
443 | */ | |
444 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
445 | return 1; | |
446 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 | 447 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
c6e6771b | 448 | return 1; |
6a274c08 | 449 | #ifdef CONFIG_VSX |
ce48b210 MN |
450 | /* |
451 | * Copy VSR 0-31 upper half from thread_struct to local | |
452 | * buffer, then write that to userspace. Also set MSR_VSX in | |
453 | * the saved MSR value to indicate that frame->mc_vregs | |
454 | * contains valid data | |
455 | */ | |
16c29d18 | 456 | if (current->thread.used_vsr && ctx_has_vsx_region) { |
7c292170 | 457 | __giveup_vsx(current); |
6a274c08 | 458 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
ce48b210 MN |
459 | return 1; |
460 | msr |= MSR_VSX; | |
461 | } | |
c6e6771b | 462 | #endif /* CONFIG_VSX */ |
81e7009e SR |
463 | #ifdef CONFIG_SPE |
464 | /* save spe registers */ | |
465 | if (current->thread.used_spe) { | |
466 | flush_spe_to_thread(current); | |
467 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
468 | ELF_NEVRREG * sizeof(u32))) | |
469 | return 1; | |
470 | /* set MSR_SPE in the saved MSR value to indicate that | |
471 | frame->mc_vregs contains valid data */ | |
9e751186 | 472 | msr |= MSR_SPE; |
81e7009e SR |
473 | } |
474 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
475 | ||
476 | /* We always copy to/from spefscr */ | |
477 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
478 | return 1; | |
479 | #endif /* CONFIG_SPE */ | |
480 | ||
9e751186 MN |
481 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
482 | return 1; | |
1da177e4 LT |
483 | if (sigret) { |
484 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
485 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
486 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
487 | return 1; | |
488 | flush_icache_range((unsigned long) &frame->tramp[0], | |
489 | (unsigned long) &frame->tramp[2]); | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | /* | |
496 | * Restore the current user register values from the user stack, | |
497 | * (except for MSR). | |
498 | */ | |
499 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 500 | struct mcontext __user *sr, int sig) |
1da177e4 | 501 | { |
81e7009e | 502 | long err; |
1da177e4 | 503 | unsigned int save_r2 = 0; |
1da177e4 | 504 | unsigned long msr; |
c6e6771b | 505 | #ifdef CONFIG_VSX |
c6e6771b MN |
506 | int i; |
507 | #endif | |
1da177e4 LT |
508 | |
509 | /* | |
510 | * restore general registers but not including MSR or SOFTE. Also | |
511 | * take care of keeping r2 (TLS) intact if not a signal | |
512 | */ | |
513 | if (!sig) | |
514 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 515 | err = restore_general_regs(regs, sr); |
9a81c16b | 516 | regs->trap = 0; |
fab5db97 | 517 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
518 | if (!sig) |
519 | regs->gpr[2] = (unsigned long) save_r2; | |
520 | if (err) | |
521 | return 1; | |
522 | ||
fab5db97 PM |
523 | /* if doing signal return, restore the previous little-endian mode */ |
524 | if (sig) | |
525 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
526 | ||
5388fb10 PM |
527 | /* |
528 | * Do this before updating the thread state in | |
529 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
530 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
531 | * tempted to save the current CPU state into the thread_struct | |
532 | * and corrupt what we are writing there. | |
533 | */ | |
534 | discard_lazy_cpu_state(); | |
535 | ||
1da177e4 | 536 | #ifdef CONFIG_ALTIVEC |
c6e6771b MN |
537 | /* |
538 | * Force the process to reload the altivec registers from | |
539 | * current->thread when it next does altivec instructions | |
540 | */ | |
1da177e4 | 541 | regs->msr &= ~MSR_VEC; |
fab5db97 | 542 | if (msr & MSR_VEC) { |
1da177e4 LT |
543 | /* restore altivec registers from the stack */ |
544 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
545 | sizeof(sr->mc_vregs))) | |
546 | return 1; | |
547 | } else if (current->thread.used_vr) | |
81e7009e | 548 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
549 | |
550 | /* Always get VRSAVE back */ | |
551 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
552 | return 1; | |
553 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 MN |
554 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
555 | return 1; | |
1da177e4 | 556 | |
c6e6771b | 557 | #ifdef CONFIG_VSX |
ce48b210 MN |
558 | /* |
559 | * Force the process to reload the VSX registers from | |
560 | * current->thread when it next does VSX instruction. | |
561 | */ | |
562 | regs->msr &= ~MSR_VSX; | |
563 | if (msr & MSR_VSX) { | |
564 | /* | |
565 | * Restore altivec registers from the stack to a local | |
566 | * buffer, then write this out to the thread_struct | |
567 | */ | |
6a274c08 | 568 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
ce48b210 | 569 | return 1; |
ce48b210 MN |
570 | } else if (current->thread.used_vsr) |
571 | for (i = 0; i < 32 ; i++) | |
572 | current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; | |
c6e6771b MN |
573 | #endif /* CONFIG_VSX */ |
574 | /* | |
575 | * force the process to reload the FP registers from | |
576 | * current->thread when it next does FP instructions | |
577 | */ | |
578 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
579 | ||
81e7009e SR |
580 | #ifdef CONFIG_SPE |
581 | /* force the process to reload the spe registers from | |
582 | current->thread when it next does spe instructions */ | |
583 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 584 | if (msr & MSR_SPE) { |
81e7009e SR |
585 | /* restore spe registers from the stack */ |
586 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
587 | ELF_NEVRREG * sizeof(u32))) | |
588 | return 1; | |
589 | } else if (current->thread.used_spe) | |
590 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
591 | ||
592 | /* Always get SPEFSCR back */ | |
593 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
594 | return 1; | |
595 | #endif /* CONFIG_SPE */ | |
596 | ||
1da177e4 LT |
597 | return 0; |
598 | } | |
599 | ||
81e7009e | 600 | #ifdef CONFIG_PPC64 |
b09a4913 | 601 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
602 | struct sigaction32 __user *oact, size_t sigsetsize) |
603 | { | |
604 | struct k_sigaction new_ka, old_ka; | |
605 | int ret; | |
1da177e4 LT |
606 | |
607 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
608 | if (sigsetsize != sizeof(compat_sigset_t)) | |
609 | return -EINVAL; | |
610 | ||
611 | if (act) { | |
612 | compat_uptr_t handler; | |
613 | ||
614 | ret = get_user(handler, &act->sa_handler); | |
615 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 616 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
617 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
618 | if (ret) | |
619 | return -EFAULT; | |
620 | } | |
621 | ||
622 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
623 | if (!ret && oact) { | |
29e646df | 624 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 625 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
626 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
627 | } | |
628 | return ret; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Note: it is necessary to treat how as an unsigned int, with the | |
633 | * corresponding cast to a signed int to insure that the proper | |
634 | * conversion (sign extension) between the register representation | |
635 | * of a signed int (msr in 32-bit mode) and the register representation | |
636 | * of a signed int (msr in 64-bit mode) is performed. | |
637 | */ | |
b09a4913 | 638 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
639 | compat_sigset_t __user *oset, size_t sigsetsize) |
640 | { | |
641 | sigset_t s; | |
642 | sigset_t __user *up; | |
1da177e4 LT |
643 | int ret; |
644 | mm_segment_t old_fs = get_fs(); | |
645 | ||
646 | if (set) { | |
81e7009e SR |
647 | if (get_sigset_t(&s, set)) |
648 | return -EFAULT; | |
1da177e4 | 649 | } |
81e7009e | 650 | |
1da177e4 LT |
651 | set_fs(KERNEL_DS); |
652 | /* This is valid because of the set_fs() */ | |
653 | up = (sigset_t __user *) &s; | |
654 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 655 | sigsetsize); |
1da177e4 LT |
656 | set_fs(old_fs); |
657 | if (ret) | |
658 | return ret; | |
659 | if (oset) { | |
81e7009e | 660 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
661 | return -EFAULT; |
662 | } | |
663 | return 0; | |
664 | } | |
665 | ||
b09a4913 | 666 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
667 | { |
668 | sigset_t s; | |
1da177e4 LT |
669 | int ret; |
670 | mm_segment_t old_fs = get_fs(); | |
671 | ||
672 | set_fs(KERNEL_DS); | |
673 | /* The __user pointer cast is valid because of the set_fs() */ | |
674 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
675 | set_fs(old_fs); | |
676 | if (!ret) { | |
81e7009e | 677 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
678 | return -EFAULT; |
679 | } | |
680 | return ret; | |
681 | } | |
682 | ||
683 | ||
684 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
685 | { | |
686 | int err; | |
687 | ||
688 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
689 | return -EFAULT; | |
690 | ||
691 | /* If you change siginfo_t structure, please be sure | |
692 | * this code is fixed accordingly. | |
693 | * It should never copy any pad contained in the structure | |
694 | * to avoid security leaks, but must copy the generic | |
695 | * 3 ints plus the relevant union member. | |
696 | * This routine must convert siginfo from 64bit to 32bit as well | |
697 | * at the same time. | |
698 | */ | |
699 | err = __put_user(s->si_signo, &d->si_signo); | |
700 | err |= __put_user(s->si_errno, &d->si_errno); | |
701 | err |= __put_user((short)s->si_code, &d->si_code); | |
702 | if (s->si_code < 0) | |
703 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
704 | SI_PAD_SIZE32); | |
705 | else switch(s->si_code >> 16) { | |
706 | case __SI_CHLD >> 16: | |
707 | err |= __put_user(s->si_pid, &d->si_pid); | |
708 | err |= __put_user(s->si_uid, &d->si_uid); | |
709 | err |= __put_user(s->si_utime, &d->si_utime); | |
710 | err |= __put_user(s->si_stime, &d->si_stime); | |
711 | err |= __put_user(s->si_status, &d->si_status); | |
712 | break; | |
713 | case __SI_FAULT >> 16: | |
714 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
715 | &d->si_addr); | |
716 | break; | |
717 | case __SI_POLL >> 16: | |
718 | err |= __put_user(s->si_band, &d->si_band); | |
719 | err |= __put_user(s->si_fd, &d->si_fd); | |
720 | break; | |
721 | case __SI_TIMER >> 16: | |
722 | err |= __put_user(s->si_tid, &d->si_tid); | |
723 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
724 | err |= __put_user(s->si_int, &d->si_int); | |
725 | break; | |
726 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
727 | case __SI_MESGQ >> 16: | |
728 | err |= __put_user(s->si_int, &d->si_int); | |
729 | /* fallthrough */ | |
730 | case __SI_KILL >> 16: | |
731 | default: | |
732 | err |= __put_user(s->si_pid, &d->si_pid); | |
733 | err |= __put_user(s->si_uid, &d->si_uid); | |
734 | break; | |
735 | } | |
736 | return err; | |
737 | } | |
738 | ||
81e7009e SR |
739 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
740 | ||
9c0c44db RM |
741 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
742 | { | |
743 | memset(to, 0, sizeof *to); | |
744 | ||
745 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
746 | copy_from_user(to->_sifields._pad, | |
747 | from->_sifields._pad, SI_PAD_SIZE32)) | |
748 | return -EFAULT; | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
755 | * corresponding cast to a signed int to insure that the proper conversion | |
756 | * (sign extension) between the register representation of a signed int | |
757 | * (msr in 32-bit mode) and the register representation of a signed int | |
758 | * (msr in 64-bit mode) is performed. | |
759 | */ | |
b09a4913 | 760 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
761 | { |
762 | siginfo_t info; | |
763 | int ret; | |
764 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 765 | |
9c0c44db RM |
766 | ret = copy_siginfo_from_user32(&info, uinfo); |
767 | if (unlikely(ret)) | |
768 | return ret; | |
769 | ||
1da177e4 LT |
770 | set_fs (KERNEL_DS); |
771 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
772 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
773 | set_fs (old_fs); | |
774 | return ret; | |
775 | } | |
1da177e4 LT |
776 | /* |
777 | * Start Alternate signal stack support | |
778 | * | |
779 | * System Calls | |
b09a4913 | 780 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
781 | */ |
782 | ||
b09a4913 | 783 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
784 | int r6, int r7, int r8, struct pt_regs *regs) |
785 | { | |
29e646df AV |
786 | stack_32_t __user * newstack = compat_ptr(__new); |
787 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
788 | stack_t uss, uoss; |
789 | int ret; | |
790 | mm_segment_t old_fs; | |
791 | unsigned long sp; | |
792 | compat_uptr_t ss_sp; | |
793 | ||
794 | /* | |
795 | * set sp to the user stack on entry to the system call | |
796 | * the system call router sets R9 to the saved registers | |
797 | */ | |
798 | sp = regs->gpr[1]; | |
799 | ||
800 | /* Put new stack info in local 64 bit stack struct */ | |
801 | if (newstack) { | |
802 | if (get_user(ss_sp, &newstack->ss_sp) || | |
803 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
804 | __get_user(uss.ss_size, &newstack->ss_size)) | |
805 | return -EFAULT; | |
806 | uss.ss_sp = compat_ptr(ss_sp); | |
807 | } | |
808 | ||
809 | old_fs = get_fs(); | |
810 | set_fs(KERNEL_DS); | |
811 | /* The __user pointer casts are valid because of the set_fs() */ | |
812 | ret = do_sigaltstack( | |
813 | newstack ? (stack_t __user *) &uss : NULL, | |
814 | oldstack ? (stack_t __user *) &uoss : NULL, | |
815 | sp); | |
816 | set_fs(old_fs); | |
817 | /* Copy the stack information to the user output buffer */ | |
818 | if (!ret && oldstack && | |
29e646df | 819 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
820 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
821 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
822 | return -EFAULT; | |
823 | return ret; | |
824 | } | |
81e7009e | 825 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 826 | |
1da177e4 LT |
827 | /* |
828 | * Set up a signal frame for a "real-time" signal handler | |
829 | * (one which gets siginfo). | |
830 | */ | |
f478f543 | 831 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e | 832 | siginfo_t *info, sigset_t *oldset, |
a3f61dc0 | 833 | struct pt_regs *regs) |
1da177e4 | 834 | { |
81e7009e SR |
835 | struct rt_sigframe __user *rt_sf; |
836 | struct mcontext __user *frame; | |
d0c3d534 | 837 | void __user *addr; |
a3f61dc0 | 838 | unsigned long newsp = 0; |
1da177e4 LT |
839 | |
840 | /* Set up Signal Frame */ | |
841 | /* Put a Real Time Context onto stack */ | |
efbda860 | 842 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf), 1); |
d0c3d534 | 843 | addr = rt_sf; |
a3f61dc0 | 844 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
845 | goto badframe; |
846 | ||
1da177e4 | 847 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 848 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
849 | || __put_user(0, &rt_sf->uc.uc_flags) |
850 | || __put_user(0, &rt_sf->uc.uc_link) | |
851 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
852 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
853 | &rt_sf->uc.uc_stack.ss_flags) | |
854 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
855 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
856 | &rt_sf->uc.uc_regs) | |
857 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
858 | goto badframe; |
859 | ||
860 | /* Save user registers on the stack */ | |
861 | frame = &rt_sf->uc.uc_mcontext; | |
d0c3d534 | 862 | addr = frame; |
a5bba930 | 863 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
16c29d18 | 864 | if (save_user_regs(regs, frame, 0, 1)) |
1da177e4 | 865 | goto badframe; |
a5bba930 | 866 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 867 | } else { |
16c29d18 | 868 | if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1)) |
1da177e4 LT |
869 | goto badframe; |
870 | regs->link = (unsigned long) frame->tramp; | |
871 | } | |
cc657f53 PM |
872 | |
873 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
874 | ||
a3f61dc0 BH |
875 | /* create a stack frame for the caller of the handler */ |
876 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 877 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 878 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 879 | goto badframe; |
a3f61dc0 BH |
880 | |
881 | /* Fill registers for signal handler */ | |
81e7009e | 882 | regs->gpr[1] = newsp; |
1da177e4 LT |
883 | regs->gpr[3] = sig; |
884 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
885 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
886 | regs->gpr[6] = (unsigned long) rt_sf; | |
887 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
888 | /* enter the signal handler in big-endian mode */ |
889 | regs->msr &= ~MSR_LE; | |
1da177e4 LT |
890 | return 1; |
891 | ||
892 | badframe: | |
81e7009e | 893 | #ifdef DEBUG_SIG |
1da177e4 LT |
894 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
895 | regs, frame, newsp); | |
896 | #endif | |
76462232 CD |
897 | if (show_unhandled_signals) |
898 | printk_ratelimited(KERN_INFO | |
899 | "%s[%d]: bad frame in handle_rt_signal32: " | |
900 | "%p nip %08lx lr %08lx\n", | |
901 | current->comm, current->pid, | |
902 | addr, regs->nip, regs->link); | |
d0c3d534 | 903 | |
1da177e4 LT |
904 | force_sigsegv(sig, current); |
905 | return 0; | |
906 | } | |
907 | ||
81e7009e | 908 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 909 | { |
1da177e4 | 910 | sigset_t set; |
81e7009e SR |
911 | struct mcontext __user *mcp; |
912 | ||
913 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
914 | return -EFAULT; | |
915 | #ifdef CONFIG_PPC64 | |
916 | { | |
917 | u32 cmcp; | |
1da177e4 | 918 | |
81e7009e SR |
919 | if (__get_user(cmcp, &ucp->uc_regs)) |
920 | return -EFAULT; | |
921 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 922 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
923 | } |
924 | #else | |
925 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 926 | return -EFAULT; |
7c85d1f9 PM |
927 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
928 | return -EFAULT; | |
81e7009e | 929 | #endif |
1da177e4 | 930 | restore_sigmask(&set); |
81e7009e | 931 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
932 | return -EFAULT; |
933 | ||
934 | return 0; | |
935 | } | |
936 | ||
81e7009e | 937 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
938 | struct ucontext __user *new_ctx, |
939 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
940 | { |
941 | unsigned char tmp; | |
16c29d18 | 942 | int ctx_has_vsx_region = 0; |
1da177e4 | 943 | |
c1cb299e MN |
944 | #ifdef CONFIG_PPC64 |
945 | unsigned long new_msr = 0; | |
946 | ||
77eb50ae AS |
947 | if (new_ctx) { |
948 | struct mcontext __user *mcp; | |
949 | u32 cmcp; | |
950 | ||
951 | /* | |
952 | * Get pointer to the real mcontext. No need for | |
953 | * access_ok since we are dealing with compat | |
954 | * pointers. | |
955 | */ | |
956 | if (__get_user(cmcp, &new_ctx->uc_regs)) | |
957 | return -EFAULT; | |
958 | mcp = (struct mcontext __user *)(u64)cmcp; | |
959 | if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) | |
960 | return -EFAULT; | |
961 | } | |
c1cb299e MN |
962 | /* |
963 | * Check that the context is not smaller than the original | |
964 | * size (with VMX but without VSX) | |
965 | */ | |
966 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) | |
967 | return -EINVAL; | |
968 | /* | |
969 | * If the new context state sets the MSR VSX bits but | |
970 | * it doesn't provide VSX state. | |
971 | */ | |
972 | if ((ctx_size < sizeof(struct ucontext)) && | |
973 | (new_msr & MSR_VSX)) | |
974 | return -EINVAL; | |
16c29d18 MN |
975 | /* Does the context have enough room to store VSX data? */ |
976 | if (ctx_size >= sizeof(struct ucontext)) | |
977 | ctx_has_vsx_region = 1; | |
c1cb299e | 978 | #else |
1da177e4 LT |
979 | /* Context size is for future use. Right now, we only make sure |
980 | * we are passed something we understand | |
981 | */ | |
81e7009e | 982 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 | 983 | return -EINVAL; |
c1cb299e | 984 | #endif |
1da177e4 | 985 | if (old_ctx != NULL) { |
1c9bb1a0 PM |
986 | struct mcontext __user *mctx; |
987 | ||
988 | /* | |
989 | * old_ctx might not be 16-byte aligned, in which | |
990 | * case old_ctx->uc_mcontext won't be either. | |
991 | * Because we have the old_ctx->uc_pad2 field | |
992 | * before old_ctx->uc_mcontext, we need to round down | |
993 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
994 | */ | |
995 | mctx = (struct mcontext __user *) | |
996 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
16c29d18 MN |
997 | if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) |
998 | || save_user_regs(regs, mctx, 0, ctx_has_vsx_region) | |
81e7009e | 999 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 1000 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
1001 | return -EFAULT; |
1002 | } | |
1003 | if (new_ctx == NULL) | |
1004 | return 0; | |
16c29d18 | 1005 | if (!access_ok(VERIFY_READ, new_ctx, ctx_size) |
1da177e4 | 1006 | || __get_user(tmp, (u8 __user *) new_ctx) |
16c29d18 | 1007 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
1da177e4 LT |
1008 | return -EFAULT; |
1009 | ||
1010 | /* | |
1011 | * If we get a fault copying the context into the kernel's | |
1012 | * image of the user's registers, we can't just return -EFAULT | |
1013 | * because the user's registers will be corrupted. For instance | |
1014 | * the NIP value may have been updated but not some of the | |
1015 | * other registers. Given that we have done the access_ok | |
1016 | * and successfully read the first and last bytes of the region | |
1017 | * above, this should only happen in an out-of-memory situation | |
1018 | * or if another thread unmaps the region containing the context. | |
1019 | * We kill the task with a SIGSEGV in this situation. | |
1020 | */ | |
81e7009e | 1021 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 1022 | do_exit(SIGSEGV); |
401d1f02 DW |
1023 | |
1024 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
1025 | return 0; |
1026 | } | |
1027 | ||
81e7009e | 1028 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1029 | struct pt_regs *regs) |
1030 | { | |
81e7009e | 1031 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
1032 | |
1033 | /* Always make any pending restarted system calls return -EINTR */ | |
1034 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1035 | ||
81e7009e SR |
1036 | rt_sf = (struct rt_sigframe __user *) |
1037 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
1038 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
1039 | goto bad; | |
81e7009e | 1040 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
1041 | goto bad; |
1042 | ||
1043 | /* | |
1044 | * It's not clear whether or why it is desirable to save the | |
1045 | * sigaltstack setting on signal delivery and restore it on | |
1046 | * signal return. But other architectures do this and we have | |
1047 | * always done it up until now so it is probably better not to | |
1048 | * change it. -- paulus | |
81e7009e SR |
1049 | */ |
1050 | #ifdef CONFIG_PPC64 | |
1051 | /* | |
b09a4913 | 1052 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
1053 | * and takes userland pointer directly. What about error checking ? |
1054 | * nobody does any... | |
1055 | */ | |
b09a4913 | 1056 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
1057 | #else |
1058 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 1059 | #endif |
401d1f02 DW |
1060 | set_thread_flag(TIF_RESTOREALL); |
1061 | return 0; | |
1da177e4 LT |
1062 | |
1063 | bad: | |
76462232 CD |
1064 | if (show_unhandled_signals) |
1065 | printk_ratelimited(KERN_INFO | |
1066 | "%s[%d]: bad frame in sys_rt_sigreturn: " | |
1067 | "%p nip %08lx lr %08lx\n", | |
1068 | current->comm, current->pid, | |
1069 | rt_sf, regs->nip, regs->link); | |
d0c3d534 | 1070 | |
1da177e4 LT |
1071 | force_sig(SIGSEGV, current); |
1072 | return 0; | |
1073 | } | |
1074 | ||
81e7009e SR |
1075 | #ifdef CONFIG_PPC32 |
1076 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
1077 | int ndbg, struct sig_dbg_op __user *dbg, | |
1078 | int r6, int r7, int r8, | |
1079 | struct pt_regs *regs) | |
1080 | { | |
1081 | struct sig_dbg_op op; | |
1082 | int i; | |
7c85d1f9 | 1083 | unsigned char tmp; |
81e7009e | 1084 | unsigned long new_msr = regs->msr; |
172ae2e7 | 1085 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1086 | unsigned long new_dbcr0 = current->thread.dbcr0; |
1087 | #endif | |
1088 | ||
1089 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 1090 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
1091 | return -EFAULT; |
1092 | switch (op.dbg_type) { | |
1093 | case SIG_DBG_SINGLE_STEPPING: | |
172ae2e7 | 1094 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1095 | if (op.dbg_value) { |
1096 | new_msr |= MSR_DE; | |
1097 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
1098 | } else { | |
3bffb652 DK |
1099 | new_dbcr0 &= ~DBCR0_IC; |
1100 | if (!DBCR_ACTIVE_EVENTS(new_dbcr0, | |
1101 | current->thread.dbcr1)) { | |
1102 | new_msr &= ~MSR_DE; | |
1103 | new_dbcr0 &= ~DBCR0_IDM; | |
1104 | } | |
81e7009e SR |
1105 | } |
1106 | #else | |
1107 | if (op.dbg_value) | |
1108 | new_msr |= MSR_SE; | |
1109 | else | |
1110 | new_msr &= ~MSR_SE; | |
1111 | #endif | |
1112 | break; | |
1113 | case SIG_DBG_BRANCH_TRACING: | |
172ae2e7 | 1114 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1115 | return -EINVAL; |
1116 | #else | |
1117 | if (op.dbg_value) | |
1118 | new_msr |= MSR_BE; | |
1119 | else | |
1120 | new_msr &= ~MSR_BE; | |
1121 | #endif | |
1122 | break; | |
1123 | ||
1124 | default: | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | } | |
1128 | ||
1129 | /* We wait until here to actually install the values in the | |
1130 | registers so if we fail in the above loop, it will not | |
1131 | affect the contents of these registers. After this point, | |
1132 | failure is a problem, anyway, and it's very unlikely unless | |
1133 | the user is really doing something wrong. */ | |
1134 | regs->msr = new_msr; | |
172ae2e7 | 1135 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
81e7009e SR |
1136 | current->thread.dbcr0 = new_dbcr0; |
1137 | #endif | |
1138 | ||
7c85d1f9 PM |
1139 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
1140 | || __get_user(tmp, (u8 __user *) ctx) | |
1141 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
1142 | return -EFAULT; | |
1143 | ||
81e7009e SR |
1144 | /* |
1145 | * If we get a fault copying the context into the kernel's | |
1146 | * image of the user's registers, we can't just return -EFAULT | |
1147 | * because the user's registers will be corrupted. For instance | |
1148 | * the NIP value may have been updated but not some of the | |
1149 | * other registers. Given that we have done the access_ok | |
1150 | * and successfully read the first and last bytes of the region | |
1151 | * above, this should only happen in an out-of-memory situation | |
1152 | * or if another thread unmaps the region containing the context. | |
1153 | * We kill the task with a SIGSEGV in this situation. | |
1154 | */ | |
1155 | if (do_setcontext(ctx, regs, 1)) { | |
76462232 CD |
1156 | if (show_unhandled_signals) |
1157 | printk_ratelimited(KERN_INFO "%s[%d]: bad frame in " | |
1158 | "sys_debug_setcontext: %p nip %08lx " | |
1159 | "lr %08lx\n", | |
1160 | current->comm, current->pid, | |
1161 | ctx, regs->nip, regs->link); | |
d0c3d534 | 1162 | |
81e7009e SR |
1163 | force_sig(SIGSEGV, current); |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * It's not clear whether or why it is desirable to save the | |
1169 | * sigaltstack setting on signal delivery and restore it on | |
1170 | * signal return. But other architectures do this and we have | |
1171 | * always done it up until now so it is probably better not to | |
1172 | * change it. -- paulus | |
1173 | */ | |
1174 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1175 | ||
401d1f02 | 1176 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1177 | out: |
1178 | return 0; | |
1179 | } | |
1180 | #endif | |
1da177e4 LT |
1181 | |
1182 | /* | |
1183 | * OK, we're invoking a handler | |
1184 | */ | |
f478f543 | 1185 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
a3f61dc0 | 1186 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 1187 | { |
81e7009e | 1188 | struct sigcontext __user *sc; |
a3f61dc0 BH |
1189 | struct sigframe __user *frame; |
1190 | unsigned long newsp = 0; | |
1da177e4 LT |
1191 | |
1192 | /* Set up Signal Frame */ | |
efbda860 | 1193 | frame = get_sigframe(ka, regs, sizeof(*frame), 1); |
a3f61dc0 | 1194 | if (unlikely(frame == NULL)) |
1da177e4 | 1195 | goto badframe; |
a3f61dc0 | 1196 | sc = (struct sigcontext __user *) &frame->sctx; |
1da177e4 LT |
1197 | |
1198 | #if _NSIG != 64 | |
81e7009e | 1199 | #error "Please adjust handle_signal()" |
1da177e4 | 1200 | #endif |
81e7009e | 1201 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1202 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1203 | #ifdef CONFIG_PPC64 |
1da177e4 | 1204 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1205 | #else |
1206 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1207 | #endif | |
a3f61dc0 | 1208 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
1da177e4 LT |
1209 | || __put_user(sig, &sc->signal)) |
1210 | goto badframe; | |
1211 | ||
a5bba930 | 1212 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
16c29d18 | 1213 | if (save_user_regs(regs, &frame->mctx, 0, 1)) |
1da177e4 | 1214 | goto badframe; |
a5bba930 | 1215 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1216 | } else { |
16c29d18 | 1217 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn, 1)) |
1da177e4 LT |
1218 | goto badframe; |
1219 | regs->link = (unsigned long) frame->mctx.tramp; | |
1220 | } | |
1221 | ||
cc657f53 PM |
1222 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1223 | ||
a3f61dc0 BH |
1224 | /* create a stack frame for the caller of the handler */ |
1225 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; | |
9747dd6f | 1226 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1227 | goto badframe; |
a3f61dc0 | 1228 | |
81e7009e | 1229 | regs->gpr[1] = newsp; |
1da177e4 LT |
1230 | regs->gpr[3] = sig; |
1231 | regs->gpr[4] = (unsigned long) sc; | |
1232 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1233 | /* enter the signal handler in big-endian mode */ |
1234 | regs->msr &= ~MSR_LE; | |
1da177e4 LT |
1235 | |
1236 | return 1; | |
1237 | ||
1238 | badframe: | |
81e7009e SR |
1239 | #ifdef DEBUG_SIG |
1240 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1241 | regs, frame, newsp); | |
1da177e4 | 1242 | #endif |
76462232 CD |
1243 | if (show_unhandled_signals) |
1244 | printk_ratelimited(KERN_INFO | |
1245 | "%s[%d]: bad frame in handle_signal32: " | |
1246 | "%p nip %08lx lr %08lx\n", | |
1247 | current->comm, current->pid, | |
1248 | frame, regs->nip, regs->link); | |
d0c3d534 | 1249 | |
1da177e4 LT |
1250 | force_sigsegv(sig, current); |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Do a signal return; undo the signal stack. | |
1256 | */ | |
81e7009e | 1257 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1258 | struct pt_regs *regs) |
1259 | { | |
81e7009e SR |
1260 | struct sigcontext __user *sc; |
1261 | struct sigcontext sigctx; | |
1262 | struct mcontext __user *sr; | |
d0c3d534 | 1263 | void __user *addr; |
1da177e4 | 1264 | sigset_t set; |
1da177e4 LT |
1265 | |
1266 | /* Always make any pending restarted system calls return -EINTR */ | |
1267 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1268 | ||
81e7009e | 1269 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
d0c3d534 | 1270 | addr = sc; |
1da177e4 LT |
1271 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1272 | goto badframe; | |
1273 | ||
81e7009e | 1274 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1275 | /* |
1276 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1277 | * unused part of the signal stackframe | |
1278 | */ | |
1279 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1280 | #else |
1281 | set.sig[0] = sigctx.oldmask; | |
1282 | set.sig[1] = sigctx._unused[3]; | |
1283 | #endif | |
1da177e4 LT |
1284 | restore_sigmask(&set); |
1285 | ||
81e7009e | 1286 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
d0c3d534 | 1287 | addr = sr; |
1da177e4 LT |
1288 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1289 | || restore_user_regs(regs, sr, 1)) | |
1290 | goto badframe; | |
1291 | ||
401d1f02 | 1292 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1293 | return 0; |
1da177e4 LT |
1294 | |
1295 | badframe: | |
76462232 CD |
1296 | if (show_unhandled_signals) |
1297 | printk_ratelimited(KERN_INFO | |
1298 | "%s[%d]: bad frame in sys_sigreturn: " | |
1299 | "%p nip %08lx lr %08lx\n", | |
1300 | current->comm, current->pid, | |
1301 | addr, regs->nip, regs->link); | |
d0c3d534 | 1302 | |
1da177e4 LT |
1303 | force_sig(SIGSEGV, current); |
1304 | return 0; | |
1305 | } |