Commit | Line | Data |
---|---|---|
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> |
81e7009e SR |
28 | #ifdef CONFIG_PPC64 |
29 | #include <linux/syscalls.h> | |
1da177e4 | 30 | #include <linux/compat.h> |
81e7009e SR |
31 | #else |
32 | #include <linux/wait.h> | |
81e7009e SR |
33 | #include <linux/unistd.h> |
34 | #include <linux/stddef.h> | |
35 | #include <linux/tty.h> | |
36 | #include <linux/binfmts.h> | |
7dfb7103 | 37 | #include <linux/freezer.h> |
81e7009e SR |
38 | #endif |
39 | ||
1da177e4 | 40 | #include <asm/uaccess.h> |
81e7009e | 41 | #include <asm/cacheflush.h> |
a7f31841 | 42 | #include <asm/syscalls.h> |
c5ff7001 | 43 | #include <asm/sigcontext.h> |
a7f290da | 44 | #include <asm/vdso.h> |
81e7009e | 45 | #ifdef CONFIG_PPC64 |
879168ee | 46 | #include "ppc32.h" |
1da177e4 | 47 | #include <asm/unistd.h> |
81e7009e SR |
48 | #else |
49 | #include <asm/ucontext.h> | |
50 | #include <asm/pgtable.h> | |
51 | #endif | |
1da177e4 | 52 | |
22e38f29 BH |
53 | #include "signal.h" |
54 | ||
81e7009e | 55 | #undef DEBUG_SIG |
1da177e4 | 56 | |
81e7009e | 57 | #ifdef CONFIG_PPC64 |
b09a4913 SR |
58 | #define sys_sigsuspend compat_sys_sigsuspend |
59 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
60 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
61 | #define sys_sigaction compat_sys_sigaction | |
62 | #define sys_swapcontext compat_sys_swapcontext | |
63 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
64 | |
65 | #define old_sigaction old_sigaction32 | |
66 | #define sigcontext sigcontext32 | |
67 | #define mcontext mcontext32 | |
68 | #define ucontext ucontext32 | |
69 | ||
c1cb299e MN |
70 | /* |
71 | * Userspace code may pass a ucontext which doesn't include VSX added | |
72 | * at the end. We need to check for this case. | |
73 | */ | |
74 | #define UCONTEXTSIZEWITHOUTVSX \ | |
75 | (sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32)) | |
76 | ||
81e7009e SR |
77 | /* |
78 | * Returning 0 means we return to userspace via | |
79 | * ret_from_except and thus restore all user | |
80 | * registers from *regs. This is what we need | |
81 | * to do when a signal has been delivered. | |
82 | */ | |
81e7009e SR |
83 | |
84 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
85 | #undef __SIGNAL_FRAMESIZE | |
86 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
87 | #undef ELF_NVRREG | |
88 | #define ELF_NVRREG ELF_NVRREG32 | |
89 | ||
90 | /* | |
91 | * Functions for flipping sigsets (thanks to brain dead generic | |
92 | * implementation that makes things simple for little endian only) | |
93 | */ | |
94 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
95 | { | |
96 | compat_sigset_t cset; | |
97 | ||
98 | switch (_NSIG_WORDS) { | |
99 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
100 | cset.sig[7] = set->sig[3] >> 32; | |
101 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
102 | cset.sig[5] = set->sig[2] >> 32; | |
103 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
104 | cset.sig[3] = set->sig[1] >> 32; | |
105 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
106 | cset.sig[1] = set->sig[0] >> 32; | |
107 | } | |
108 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
109 | } | |
110 | ||
9b7cf8b4 PM |
111 | static inline int get_sigset_t(sigset_t *set, |
112 | const compat_sigset_t __user *uset) | |
81e7009e SR |
113 | { |
114 | compat_sigset_t s32; | |
115 | ||
116 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
117 | return -EFAULT; | |
118 | ||
119 | /* | |
120 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
121 | * in the "wrong" endian in 32-bit user storage). | |
122 | */ | |
123 | switch (_NSIG_WORDS) { | |
124 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
125 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
126 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
127 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
133 | struct old_sigaction __user *act) | |
134 | { | |
135 | compat_old_sigset_t mask; | |
136 | compat_uptr_t handler, restorer; | |
137 | ||
138 | if (get_user(handler, &act->sa_handler) || | |
139 | __get_user(restorer, &act->sa_restorer) || | |
140 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
141 | __get_user(mask, &act->sa_mask)) | |
142 | return -EFAULT; | |
143 | new_ka->sa.sa_handler = compat_ptr(handler); | |
144 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
145 | siginitset(&new_ka->sa.sa_mask, mask); | |
146 | return 0; | |
147 | } | |
148 | ||
29e646df | 149 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
150 | #define from_user_ptr(p) compat_ptr(p) |
151 | ||
152 | static inline int save_general_regs(struct pt_regs *regs, | |
153 | struct mcontext __user *frame) | |
154 | { | |
155 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
156 | int i; | |
157 | ||
1bd79336 | 158 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
159 | |
160 | for (i = 0; i <= PT_RESULT; i ++) { | |
161 | if (i == 14 && !FULL_REGS(regs)) | |
162 | i = 32; | |
81e7009e SR |
163 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
164 | return -EFAULT; | |
401d1f02 | 165 | } |
81e7009e SR |
166 | return 0; |
167 | } | |
168 | ||
169 | static inline int restore_general_regs(struct pt_regs *regs, | |
170 | struct mcontext __user *sr) | |
171 | { | |
172 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
173 | int i; | |
174 | ||
175 | for (i = 0; i <= PT_RESULT; i++) { | |
176 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
177 | continue; | |
178 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
179 | return -EFAULT; | |
180 | } | |
181 | return 0; | |
182 | } | |
183 | ||
184 | #else /* CONFIG_PPC64 */ | |
185 | ||
81e7009e SR |
186 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
187 | ||
188 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
189 | { | |
190 | return copy_to_user(uset, set, sizeof(*uset)); | |
191 | } | |
192 | ||
9b7cf8b4 | 193 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
194 | { |
195 | return copy_from_user(set, uset, sizeof(*uset)); | |
196 | } | |
197 | ||
198 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
199 | struct old_sigaction __user *act) | |
200 | { | |
201 | old_sigset_t mask; | |
202 | ||
203 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
204 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
205 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
206 | return -EFAULT; | |
207 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
208 | __get_user(mask, &act->sa_mask); | |
209 | siginitset(&new_ka->sa.sa_mask, mask); | |
210 | return 0; | |
211 | } | |
212 | ||
29e646df AV |
213 | #define to_user_ptr(p) ((unsigned long)(p)) |
214 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
215 | |
216 | static inline int save_general_regs(struct pt_regs *regs, | |
217 | struct mcontext __user *frame) | |
218 | { | |
1bd79336 | 219 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
220 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
221 | } | |
222 | ||
223 | static inline int restore_general_regs(struct pt_regs *regs, | |
224 | struct mcontext __user *sr) | |
225 | { | |
226 | /* copy up to but not including MSR */ | |
227 | if (__copy_from_user(regs, &sr->mc_gregs, | |
228 | PT_MSR * sizeof(elf_greg_t))) | |
229 | return -EFAULT; | |
230 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
231 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
232 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
233 | return -EFAULT; | |
234 | return 0; | |
235 | } | |
236 | ||
237 | #endif /* CONFIG_PPC64 */ | |
238 | ||
81e7009e SR |
239 | /* |
240 | * Atomically swap in the new signal mask, and wait for a signal. | |
241 | */ | |
150256d8 | 242 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 243 | { |
81e7009e SR |
244 | mask &= _BLOCKABLE; |
245 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 246 | current->saved_sigmask = current->blocked; |
81e7009e SR |
247 | siginitset(¤t->blocked, mask); |
248 | recalc_sigpending(); | |
249 | spin_unlock_irq(¤t->sighand->siglock); | |
250 | ||
150256d8 DW |
251 | current->state = TASK_INTERRUPTIBLE; |
252 | schedule(); | |
7a10174e | 253 | set_restore_sigmask(); |
150256d8 | 254 | return -ERESTARTNOHAND; |
81e7009e SR |
255 | } |
256 | ||
81e7009e SR |
257 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
258 | struct old_sigaction __user *oact) | |
259 | { | |
260 | struct k_sigaction new_ka, old_ka; | |
261 | int ret; | |
262 | ||
263 | #ifdef CONFIG_PPC64 | |
264 | if (sig < 0) | |
265 | sig = -sig; | |
266 | #endif | |
267 | ||
268 | if (act) { | |
269 | if (get_old_sigaction(&new_ka, act)) | |
270 | return -EFAULT; | |
271 | } | |
272 | ||
273 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
274 | if (!ret && oact) { | |
275 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
276 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
277 | &oact->sa_handler) || | |
278 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
279 | &oact->sa_restorer) || | |
280 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
281 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
282 | return -EFAULT; | |
283 | } | |
284 | ||
285 | return ret; | |
286 | } | |
1da177e4 LT |
287 | |
288 | /* | |
289 | * When we have signals to deliver, we set up on the | |
290 | * user stack, going down from the original stack pointer: | |
a3f61dc0 BH |
291 | * an ABI gap of 56 words |
292 | * an mcontext struct | |
81e7009e SR |
293 | * a sigcontext struct |
294 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 295 | * |
a3f61dc0 BH |
296 | * Each of these things must be a multiple of 16 bytes in size. The following |
297 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
298 | * |
299 | */ | |
a3f61dc0 BH |
300 | struct sigframe { |
301 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 302 | struct mcontext mctx; /* all the register values */ |
1da177e4 LT |
303 | /* |
304 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
305 | * regs and 18 fp regs below sp before decrementing it. | |
306 | */ | |
307 | int abigap[56]; | |
308 | }; | |
309 | ||
310 | /* We use the mc_pad field for the signal return trampoline. */ | |
311 | #define tramp mc_pad | |
312 | ||
313 | /* | |
314 | * When we have rt signals to deliver, we set up on the | |
315 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
316 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
317 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
318 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
319 | * positions as in older kernels). |
320 | * | |
321 | * Each of these things must be a multiple of 16 bytes in size. | |
322 | * | |
323 | */ | |
81e7009e SR |
324 | struct rt_sigframe { |
325 | #ifdef CONFIG_PPC64 | |
326 | compat_siginfo_t info; | |
327 | #else | |
328 | struct siginfo info; | |
329 | #endif | |
330 | struct ucontext uc; | |
1da177e4 LT |
331 | /* |
332 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
333 | * regs and 18 fp regs below sp before decrementing it. | |
334 | */ | |
335 | int abigap[56]; | |
336 | }; | |
337 | ||
6a274c08 MN |
338 | #ifdef CONFIG_VSX |
339 | unsigned long copy_fpr_to_user(void __user *to, | |
340 | struct task_struct *task) | |
341 | { | |
342 | double buf[ELF_NFPREG]; | |
343 | int i; | |
344 | ||
345 | /* save FPR copy to local buffer then write to the thread_struct */ | |
346 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
347 | buf[i] = task->thread.TS_FPR(i); | |
348 | memcpy(&buf[i], &task->thread.fpscr, sizeof(double)); | |
349 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); | |
350 | } | |
351 | ||
352 | unsigned long copy_fpr_from_user(struct task_struct *task, | |
353 | void __user *from) | |
354 | { | |
355 | double buf[ELF_NFPREG]; | |
356 | int i; | |
357 | ||
358 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
359 | return 1; | |
360 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
361 | task->thread.TS_FPR(i) = buf[i]; | |
362 | memcpy(&task->thread.fpscr, &buf[i], sizeof(double)); | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | unsigned long copy_vsx_to_user(void __user *to, | |
368 | struct task_struct *task) | |
369 | { | |
370 | double buf[ELF_NVSRHALFREG]; | |
371 | int i; | |
372 | ||
373 | /* save FPR copy to local buffer then write to the thread_struct */ | |
374 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
375 | buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET]; | |
376 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); | |
377 | } | |
378 | ||
379 | unsigned long copy_vsx_from_user(struct task_struct *task, | |
380 | void __user *from) | |
381 | { | |
382 | double buf[ELF_NVSRHALFREG]; | |
383 | int i; | |
384 | ||
385 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
386 | return 1; | |
387 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
388 | task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i]; | |
389 | return 0; | |
390 | } | |
391 | #else | |
392 | inline unsigned long copy_fpr_to_user(void __user *to, | |
393 | struct task_struct *task) | |
394 | { | |
395 | return __copy_to_user(to, task->thread.fpr, | |
396 | ELF_NFPREG * sizeof(double)); | |
397 | } | |
398 | ||
399 | inline unsigned long copy_fpr_from_user(struct task_struct *task, | |
400 | void __user *from) | |
401 | { | |
402 | return __copy_from_user(task->thread.fpr, from, | |
403 | ELF_NFPREG * sizeof(double)); | |
404 | } | |
405 | #endif | |
406 | ||
1da177e4 LT |
407 | /* |
408 | * Save the current user registers on the user stack. | |
81e7009e SR |
409 | * We only save the altivec/spe registers if the process has used |
410 | * altivec/spe instructions at some point. | |
1da177e4 | 411 | */ |
81e7009e | 412 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
16c29d18 | 413 | int sigret, int ctx_has_vsx_region) |
1da177e4 | 414 | { |
9e751186 MN |
415 | unsigned long msr = regs->msr; |
416 | ||
1da177e4 LT |
417 | /* Make sure floating point registers are stored in regs */ |
418 | flush_fp_to_thread(current); | |
419 | ||
c6e6771b MN |
420 | /* save general registers */ |
421 | if (save_general_regs(regs, frame)) | |
1da177e4 LT |
422 | return 1; |
423 | ||
1da177e4 LT |
424 | #ifdef CONFIG_ALTIVEC |
425 | /* save altivec registers */ | |
426 | if (current->thread.used_vr) { | |
427 | flush_altivec_to_thread(current); | |
428 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 429 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
430 | return 1; |
431 | /* set MSR_VEC in the saved MSR value to indicate that | |
432 | frame->mc_vregs contains valid data */ | |
9e751186 | 433 | msr |= MSR_VEC; |
1da177e4 LT |
434 | } |
435 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
436 | ||
437 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
438 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
439 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
440 | * most significant bits of that same vector. --BenH | |
441 | */ | |
442 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
443 | return 1; | |
444 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 | 445 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
c6e6771b | 446 | return 1; |
6a274c08 | 447 | #ifdef CONFIG_VSX |
ce48b210 MN |
448 | /* |
449 | * Copy VSR 0-31 upper half from thread_struct to local | |
450 | * buffer, then write that to userspace. Also set MSR_VSX in | |
451 | * the saved MSR value to indicate that frame->mc_vregs | |
452 | * contains valid data | |
453 | */ | |
16c29d18 | 454 | if (current->thread.used_vsr && ctx_has_vsx_region) { |
7c292170 | 455 | __giveup_vsx(current); |
6a274c08 | 456 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
ce48b210 MN |
457 | return 1; |
458 | msr |= MSR_VSX; | |
459 | } | |
c6e6771b | 460 | #endif /* CONFIG_VSX */ |
81e7009e SR |
461 | #ifdef CONFIG_SPE |
462 | /* save spe registers */ | |
463 | if (current->thread.used_spe) { | |
464 | flush_spe_to_thread(current); | |
465 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
466 | ELF_NEVRREG * sizeof(u32))) | |
467 | return 1; | |
468 | /* set MSR_SPE in the saved MSR value to indicate that | |
469 | frame->mc_vregs contains valid data */ | |
9e751186 | 470 | msr |= MSR_SPE; |
81e7009e SR |
471 | } |
472 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
473 | ||
474 | /* We always copy to/from spefscr */ | |
475 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
476 | return 1; | |
477 | #endif /* CONFIG_SPE */ | |
478 | ||
9e751186 MN |
479 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
480 | return 1; | |
1da177e4 LT |
481 | if (sigret) { |
482 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
483 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
484 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
485 | return 1; | |
486 | flush_icache_range((unsigned long) &frame->tramp[0], | |
487 | (unsigned long) &frame->tramp[2]); | |
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Restore the current user register values from the user stack, | |
495 | * (except for MSR). | |
496 | */ | |
497 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 498 | struct mcontext __user *sr, int sig) |
1da177e4 | 499 | { |
81e7009e | 500 | long err; |
1da177e4 | 501 | unsigned int save_r2 = 0; |
1da177e4 | 502 | unsigned long msr; |
c6e6771b | 503 | #ifdef CONFIG_VSX |
c6e6771b MN |
504 | int i; |
505 | #endif | |
1da177e4 LT |
506 | |
507 | /* | |
508 | * restore general registers but not including MSR or SOFTE. Also | |
509 | * take care of keeping r2 (TLS) intact if not a signal | |
510 | */ | |
511 | if (!sig) | |
512 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 513 | err = restore_general_regs(regs, sr); |
fab5db97 | 514 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
515 | if (!sig) |
516 | regs->gpr[2] = (unsigned long) save_r2; | |
517 | if (err) | |
518 | return 1; | |
519 | ||
fab5db97 PM |
520 | /* if doing signal return, restore the previous little-endian mode */ |
521 | if (sig) | |
522 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
523 | ||
5388fb10 PM |
524 | /* |
525 | * Do this before updating the thread state in | |
526 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
527 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
528 | * tempted to save the current CPU state into the thread_struct | |
529 | * and corrupt what we are writing there. | |
530 | */ | |
531 | discard_lazy_cpu_state(); | |
532 | ||
1da177e4 | 533 | #ifdef CONFIG_ALTIVEC |
c6e6771b MN |
534 | /* |
535 | * Force the process to reload the altivec registers from | |
536 | * current->thread when it next does altivec instructions | |
537 | */ | |
1da177e4 | 538 | regs->msr &= ~MSR_VEC; |
fab5db97 | 539 | if (msr & MSR_VEC) { |
1da177e4 LT |
540 | /* restore altivec registers from the stack */ |
541 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
542 | sizeof(sr->mc_vregs))) | |
543 | return 1; | |
544 | } else if (current->thread.used_vr) | |
81e7009e | 545 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
546 | |
547 | /* Always get VRSAVE back */ | |
548 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
549 | return 1; | |
550 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 MN |
551 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
552 | return 1; | |
1da177e4 | 553 | |
c6e6771b | 554 | #ifdef CONFIG_VSX |
ce48b210 MN |
555 | /* |
556 | * Force the process to reload the VSX registers from | |
557 | * current->thread when it next does VSX instruction. | |
558 | */ | |
559 | regs->msr &= ~MSR_VSX; | |
560 | if (msr & MSR_VSX) { | |
561 | /* | |
562 | * Restore altivec registers from the stack to a local | |
563 | * buffer, then write this out to the thread_struct | |
564 | */ | |
6a274c08 | 565 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
ce48b210 | 566 | return 1; |
ce48b210 MN |
567 | } else if (current->thread.used_vsr) |
568 | for (i = 0; i < 32 ; i++) | |
569 | current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; | |
c6e6771b MN |
570 | #endif /* CONFIG_VSX */ |
571 | /* | |
572 | * force the process to reload the FP registers from | |
573 | * current->thread when it next does FP instructions | |
574 | */ | |
575 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
576 | ||
81e7009e SR |
577 | #ifdef CONFIG_SPE |
578 | /* force the process to reload the spe registers from | |
579 | current->thread when it next does spe instructions */ | |
580 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 581 | if (msr & MSR_SPE) { |
81e7009e SR |
582 | /* restore spe registers from the stack */ |
583 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
584 | ELF_NEVRREG * sizeof(u32))) | |
585 | return 1; | |
586 | } else if (current->thread.used_spe) | |
587 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
588 | ||
589 | /* Always get SPEFSCR back */ | |
590 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
591 | return 1; | |
592 | #endif /* CONFIG_SPE */ | |
593 | ||
1da177e4 LT |
594 | return 0; |
595 | } | |
596 | ||
81e7009e | 597 | #ifdef CONFIG_PPC64 |
b09a4913 | 598 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
599 | struct sigaction32 __user *oact, size_t sigsetsize) |
600 | { | |
601 | struct k_sigaction new_ka, old_ka; | |
602 | int ret; | |
1da177e4 LT |
603 | |
604 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
605 | if (sigsetsize != sizeof(compat_sigset_t)) | |
606 | return -EINVAL; | |
607 | ||
608 | if (act) { | |
609 | compat_uptr_t handler; | |
610 | ||
611 | ret = get_user(handler, &act->sa_handler); | |
612 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 613 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
614 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
615 | if (ret) | |
616 | return -EFAULT; | |
617 | } | |
618 | ||
619 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
620 | if (!ret && oact) { | |
29e646df | 621 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 622 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
623 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
624 | } | |
625 | return ret; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Note: it is necessary to treat how as an unsigned int, with the | |
630 | * corresponding cast to a signed int to insure that the proper | |
631 | * conversion (sign extension) between the register representation | |
632 | * of a signed int (msr in 32-bit mode) and the register representation | |
633 | * of a signed int (msr in 64-bit mode) is performed. | |
634 | */ | |
b09a4913 | 635 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
636 | compat_sigset_t __user *oset, size_t sigsetsize) |
637 | { | |
638 | sigset_t s; | |
639 | sigset_t __user *up; | |
1da177e4 LT |
640 | int ret; |
641 | mm_segment_t old_fs = get_fs(); | |
642 | ||
643 | if (set) { | |
81e7009e SR |
644 | if (get_sigset_t(&s, set)) |
645 | return -EFAULT; | |
1da177e4 | 646 | } |
81e7009e | 647 | |
1da177e4 LT |
648 | set_fs(KERNEL_DS); |
649 | /* This is valid because of the set_fs() */ | |
650 | up = (sigset_t __user *) &s; | |
651 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 652 | sigsetsize); |
1da177e4 LT |
653 | set_fs(old_fs); |
654 | if (ret) | |
655 | return ret; | |
656 | if (oset) { | |
81e7009e | 657 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
658 | return -EFAULT; |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
b09a4913 | 663 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
664 | { |
665 | sigset_t s; | |
1da177e4 LT |
666 | int ret; |
667 | mm_segment_t old_fs = get_fs(); | |
668 | ||
669 | set_fs(KERNEL_DS); | |
670 | /* The __user pointer cast is valid because of the set_fs() */ | |
671 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
672 | set_fs(old_fs); | |
673 | if (!ret) { | |
81e7009e | 674 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
675 | return -EFAULT; |
676 | } | |
677 | return ret; | |
678 | } | |
679 | ||
680 | ||
681 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
682 | { | |
683 | int err; | |
684 | ||
685 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
686 | return -EFAULT; | |
687 | ||
688 | /* If you change siginfo_t structure, please be sure | |
689 | * this code is fixed accordingly. | |
690 | * It should never copy any pad contained in the structure | |
691 | * to avoid security leaks, but must copy the generic | |
692 | * 3 ints plus the relevant union member. | |
693 | * This routine must convert siginfo from 64bit to 32bit as well | |
694 | * at the same time. | |
695 | */ | |
696 | err = __put_user(s->si_signo, &d->si_signo); | |
697 | err |= __put_user(s->si_errno, &d->si_errno); | |
698 | err |= __put_user((short)s->si_code, &d->si_code); | |
699 | if (s->si_code < 0) | |
700 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
701 | SI_PAD_SIZE32); | |
702 | else switch(s->si_code >> 16) { | |
703 | case __SI_CHLD >> 16: | |
704 | err |= __put_user(s->si_pid, &d->si_pid); | |
705 | err |= __put_user(s->si_uid, &d->si_uid); | |
706 | err |= __put_user(s->si_utime, &d->si_utime); | |
707 | err |= __put_user(s->si_stime, &d->si_stime); | |
708 | err |= __put_user(s->si_status, &d->si_status); | |
709 | break; | |
710 | case __SI_FAULT >> 16: | |
711 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
712 | &d->si_addr); | |
713 | break; | |
714 | case __SI_POLL >> 16: | |
715 | err |= __put_user(s->si_band, &d->si_band); | |
716 | err |= __put_user(s->si_fd, &d->si_fd); | |
717 | break; | |
718 | case __SI_TIMER >> 16: | |
719 | err |= __put_user(s->si_tid, &d->si_tid); | |
720 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
721 | err |= __put_user(s->si_int, &d->si_int); | |
722 | break; | |
723 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
724 | case __SI_MESGQ >> 16: | |
725 | err |= __put_user(s->si_int, &d->si_int); | |
726 | /* fallthrough */ | |
727 | case __SI_KILL >> 16: | |
728 | default: | |
729 | err |= __put_user(s->si_pid, &d->si_pid); | |
730 | err |= __put_user(s->si_uid, &d->si_uid); | |
731 | break; | |
732 | } | |
733 | return err; | |
734 | } | |
735 | ||
81e7009e SR |
736 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
737 | ||
9c0c44db RM |
738 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
739 | { | |
740 | memset(to, 0, sizeof *to); | |
741 | ||
742 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
743 | copy_from_user(to->_sifields._pad, | |
744 | from->_sifields._pad, SI_PAD_SIZE32)) | |
745 | return -EFAULT; | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
1da177e4 LT |
750 | /* |
751 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
752 | * corresponding cast to a signed int to insure that the proper conversion | |
753 | * (sign extension) between the register representation of a signed int | |
754 | * (msr in 32-bit mode) and the register representation of a signed int | |
755 | * (msr in 64-bit mode) is performed. | |
756 | */ | |
b09a4913 | 757 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
758 | { |
759 | siginfo_t info; | |
760 | int ret; | |
761 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 762 | |
9c0c44db RM |
763 | ret = copy_siginfo_from_user32(&info, uinfo); |
764 | if (unlikely(ret)) | |
765 | return ret; | |
766 | ||
1da177e4 LT |
767 | set_fs (KERNEL_DS); |
768 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
769 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
770 | set_fs (old_fs); | |
771 | return ret; | |
772 | } | |
1da177e4 LT |
773 | /* |
774 | * Start Alternate signal stack support | |
775 | * | |
776 | * System Calls | |
b09a4913 | 777 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
778 | */ |
779 | ||
b09a4913 | 780 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
781 | int r6, int r7, int r8, struct pt_regs *regs) |
782 | { | |
29e646df AV |
783 | stack_32_t __user * newstack = compat_ptr(__new); |
784 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
785 | stack_t uss, uoss; |
786 | int ret; | |
787 | mm_segment_t old_fs; | |
788 | unsigned long sp; | |
789 | compat_uptr_t ss_sp; | |
790 | ||
791 | /* | |
792 | * set sp to the user stack on entry to the system call | |
793 | * the system call router sets R9 to the saved registers | |
794 | */ | |
795 | sp = regs->gpr[1]; | |
796 | ||
797 | /* Put new stack info in local 64 bit stack struct */ | |
798 | if (newstack) { | |
799 | if (get_user(ss_sp, &newstack->ss_sp) || | |
800 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
801 | __get_user(uss.ss_size, &newstack->ss_size)) | |
802 | return -EFAULT; | |
803 | uss.ss_sp = compat_ptr(ss_sp); | |
804 | } | |
805 | ||
806 | old_fs = get_fs(); | |
807 | set_fs(KERNEL_DS); | |
808 | /* The __user pointer casts are valid because of the set_fs() */ | |
809 | ret = do_sigaltstack( | |
810 | newstack ? (stack_t __user *) &uss : NULL, | |
811 | oldstack ? (stack_t __user *) &uoss : NULL, | |
812 | sp); | |
813 | set_fs(old_fs); | |
814 | /* Copy the stack information to the user output buffer */ | |
815 | if (!ret && oldstack && | |
29e646df | 816 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
817 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
818 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
819 | return -EFAULT; | |
820 | return ret; | |
821 | } | |
81e7009e | 822 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 823 | |
1da177e4 LT |
824 | /* |
825 | * Set up a signal frame for a "real-time" signal handler | |
826 | * (one which gets siginfo). | |
827 | */ | |
f478f543 | 828 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e | 829 | siginfo_t *info, sigset_t *oldset, |
a3f61dc0 | 830 | struct pt_regs *regs) |
1da177e4 | 831 | { |
81e7009e SR |
832 | struct rt_sigframe __user *rt_sf; |
833 | struct mcontext __user *frame; | |
d0c3d534 | 834 | void __user *addr; |
a3f61dc0 | 835 | unsigned long newsp = 0; |
1da177e4 LT |
836 | |
837 | /* Set up Signal Frame */ | |
838 | /* Put a Real Time Context onto stack */ | |
a3f61dc0 | 839 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf)); |
d0c3d534 | 840 | addr = rt_sf; |
a3f61dc0 | 841 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
842 | goto badframe; |
843 | ||
1da177e4 | 844 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 845 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
846 | || __put_user(0, &rt_sf->uc.uc_flags) |
847 | || __put_user(0, &rt_sf->uc.uc_link) | |
848 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
849 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
850 | &rt_sf->uc.uc_stack.ss_flags) | |
851 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
852 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
853 | &rt_sf->uc.uc_regs) | |
854 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
855 | goto badframe; |
856 | ||
857 | /* Save user registers on the stack */ | |
858 | frame = &rt_sf->uc.uc_mcontext; | |
d0c3d534 | 859 | addr = frame; |
a5bba930 | 860 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
16c29d18 | 861 | if (save_user_regs(regs, frame, 0, 1)) |
1da177e4 | 862 | goto badframe; |
a5bba930 | 863 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 864 | } else { |
16c29d18 | 865 | if (save_user_regs(regs, frame, __NR_rt_sigreturn, 1)) |
1da177e4 LT |
866 | goto badframe; |
867 | regs->link = (unsigned long) frame->tramp; | |
868 | } | |
cc657f53 PM |
869 | |
870 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
871 | ||
a3f61dc0 BH |
872 | /* create a stack frame for the caller of the handler */ |
873 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 874 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 875 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 876 | goto badframe; |
a3f61dc0 BH |
877 | |
878 | /* Fill registers for signal handler */ | |
81e7009e | 879 | regs->gpr[1] = newsp; |
1da177e4 LT |
880 | regs->gpr[3] = sig; |
881 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
882 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
883 | regs->gpr[6] = (unsigned long) rt_sf; | |
884 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
885 | /* enter the signal handler in big-endian mode */ |
886 | regs->msr &= ~MSR_LE; | |
1da177e4 | 887 | regs->trap = 0; |
1da177e4 LT |
888 | return 1; |
889 | ||
890 | badframe: | |
81e7009e | 891 | #ifdef DEBUG_SIG |
1da177e4 LT |
892 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
893 | regs, frame, newsp); | |
894 | #endif | |
d0c3d534 OJ |
895 | if (show_unhandled_signals && printk_ratelimit()) |
896 | printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: " | |
897 | "%p nip %08lx lr %08lx\n", | |
898 | current->comm, current->pid, | |
899 | addr, regs->nip, regs->link); | |
900 | ||
1da177e4 LT |
901 | force_sigsegv(sig, current); |
902 | return 0; | |
903 | } | |
904 | ||
81e7009e | 905 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 906 | { |
1da177e4 | 907 | sigset_t set; |
81e7009e SR |
908 | struct mcontext __user *mcp; |
909 | ||
910 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
911 | return -EFAULT; | |
912 | #ifdef CONFIG_PPC64 | |
913 | { | |
914 | u32 cmcp; | |
1da177e4 | 915 | |
81e7009e SR |
916 | if (__get_user(cmcp, &ucp->uc_regs)) |
917 | return -EFAULT; | |
918 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 919 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
920 | } |
921 | #else | |
922 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 923 | return -EFAULT; |
7c85d1f9 PM |
924 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
925 | return -EFAULT; | |
81e7009e | 926 | #endif |
1da177e4 | 927 | restore_sigmask(&set); |
81e7009e | 928 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
929 | return -EFAULT; |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
81e7009e | 934 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
935 | struct ucontext __user *new_ctx, |
936 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
937 | { |
938 | unsigned char tmp; | |
16c29d18 | 939 | int ctx_has_vsx_region = 0; |
1da177e4 | 940 | |
c1cb299e MN |
941 | #ifdef CONFIG_PPC64 |
942 | unsigned long new_msr = 0; | |
943 | ||
77eb50ae AS |
944 | if (new_ctx) { |
945 | struct mcontext __user *mcp; | |
946 | u32 cmcp; | |
947 | ||
948 | /* | |
949 | * Get pointer to the real mcontext. No need for | |
950 | * access_ok since we are dealing with compat | |
951 | * pointers. | |
952 | */ | |
953 | if (__get_user(cmcp, &new_ctx->uc_regs)) | |
954 | return -EFAULT; | |
955 | mcp = (struct mcontext __user *)(u64)cmcp; | |
956 | if (__get_user(new_msr, &mcp->mc_gregs[PT_MSR])) | |
957 | return -EFAULT; | |
958 | } | |
c1cb299e MN |
959 | /* |
960 | * Check that the context is not smaller than the original | |
961 | * size (with VMX but without VSX) | |
962 | */ | |
963 | if (ctx_size < UCONTEXTSIZEWITHOUTVSX) | |
964 | return -EINVAL; | |
965 | /* | |
966 | * If the new context state sets the MSR VSX bits but | |
967 | * it doesn't provide VSX state. | |
968 | */ | |
969 | if ((ctx_size < sizeof(struct ucontext)) && | |
970 | (new_msr & MSR_VSX)) | |
971 | return -EINVAL; | |
16c29d18 MN |
972 | /* Does the context have enough room to store VSX data? */ |
973 | if (ctx_size >= sizeof(struct ucontext)) | |
974 | ctx_has_vsx_region = 1; | |
c1cb299e | 975 | #else |
1da177e4 LT |
976 | /* Context size is for future use. Right now, we only make sure |
977 | * we are passed something we understand | |
978 | */ | |
81e7009e | 979 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 | 980 | return -EINVAL; |
c1cb299e | 981 | #endif |
1da177e4 | 982 | if (old_ctx != NULL) { |
1c9bb1a0 PM |
983 | struct mcontext __user *mctx; |
984 | ||
985 | /* | |
986 | * old_ctx might not be 16-byte aligned, in which | |
987 | * case old_ctx->uc_mcontext won't be either. | |
988 | * Because we have the old_ctx->uc_pad2 field | |
989 | * before old_ctx->uc_mcontext, we need to round down | |
990 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
991 | */ | |
992 | mctx = (struct mcontext __user *) | |
993 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
16c29d18 MN |
994 | if (!access_ok(VERIFY_WRITE, old_ctx, ctx_size) |
995 | || save_user_regs(regs, mctx, 0, ctx_has_vsx_region) | |
81e7009e | 996 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 997 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
998 | return -EFAULT; |
999 | } | |
1000 | if (new_ctx == NULL) | |
1001 | return 0; | |
16c29d18 | 1002 | if (!access_ok(VERIFY_READ, new_ctx, ctx_size) |
1da177e4 | 1003 | || __get_user(tmp, (u8 __user *) new_ctx) |
16c29d18 | 1004 | || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1)) |
1da177e4 LT |
1005 | return -EFAULT; |
1006 | ||
1007 | /* | |
1008 | * If we get a fault copying the context into the kernel's | |
1009 | * image of the user's registers, we can't just return -EFAULT | |
1010 | * because the user's registers will be corrupted. For instance | |
1011 | * the NIP value may have been updated but not some of the | |
1012 | * other registers. Given that we have done the access_ok | |
1013 | * and successfully read the first and last bytes of the region | |
1014 | * above, this should only happen in an out-of-memory situation | |
1015 | * or if another thread unmaps the region containing the context. | |
1016 | * We kill the task with a SIGSEGV in this situation. | |
1017 | */ | |
81e7009e | 1018 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 1019 | do_exit(SIGSEGV); |
401d1f02 DW |
1020 | |
1021 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
1022 | return 0; |
1023 | } | |
1024 | ||
81e7009e | 1025 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1026 | struct pt_regs *regs) |
1027 | { | |
81e7009e | 1028 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
1029 | |
1030 | /* Always make any pending restarted system calls return -EINTR */ | |
1031 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1032 | ||
81e7009e SR |
1033 | rt_sf = (struct rt_sigframe __user *) |
1034 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
1035 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
1036 | goto bad; | |
81e7009e | 1037 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
1038 | goto bad; |
1039 | ||
1040 | /* | |
1041 | * It's not clear whether or why it is desirable to save the | |
1042 | * sigaltstack setting on signal delivery and restore it on | |
1043 | * signal return. But other architectures do this and we have | |
1044 | * always done it up until now so it is probably better not to | |
1045 | * change it. -- paulus | |
81e7009e SR |
1046 | */ |
1047 | #ifdef CONFIG_PPC64 | |
1048 | /* | |
b09a4913 | 1049 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
1050 | * and takes userland pointer directly. What about error checking ? |
1051 | * nobody does any... | |
1052 | */ | |
b09a4913 | 1053 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
1054 | #else |
1055 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 1056 | #endif |
401d1f02 DW |
1057 | set_thread_flag(TIF_RESTOREALL); |
1058 | return 0; | |
1da177e4 LT |
1059 | |
1060 | bad: | |
d0c3d534 OJ |
1061 | if (show_unhandled_signals && printk_ratelimit()) |
1062 | printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: " | |
1063 | "%p nip %08lx lr %08lx\n", | |
1064 | current->comm, current->pid, | |
1065 | rt_sf, regs->nip, regs->link); | |
1066 | ||
1da177e4 LT |
1067 | force_sig(SIGSEGV, current); |
1068 | return 0; | |
1069 | } | |
1070 | ||
81e7009e SR |
1071 | #ifdef CONFIG_PPC32 |
1072 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
1073 | int ndbg, struct sig_dbg_op __user *dbg, | |
1074 | int r6, int r7, int r8, | |
1075 | struct pt_regs *regs) | |
1076 | { | |
1077 | struct sig_dbg_op op; | |
1078 | int i; | |
7c85d1f9 | 1079 | unsigned char tmp; |
81e7009e SR |
1080 | unsigned long new_msr = regs->msr; |
1081 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1082 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
1083 | #endif | |
1084 | ||
1085 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 1086 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
1087 | return -EFAULT; |
1088 | switch (op.dbg_type) { | |
1089 | case SIG_DBG_SINGLE_STEPPING: | |
1090 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1091 | if (op.dbg_value) { | |
1092 | new_msr |= MSR_DE; | |
1093 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
1094 | } else { | |
1095 | new_msr &= ~MSR_DE; | |
1096 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
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: | |
1106 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
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; | |
1127 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
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)) { | |
d0c3d534 OJ |
1148 | if (show_unhandled_signals && printk_ratelimit()) |
1149 | printk(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); | |
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 */ | |
a3f61dc0 BH |
1185 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
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 | 1227 | regs->trap = 0; |
1da177e4 LT |
1228 | |
1229 | return 1; | |
1230 | ||
1231 | badframe: | |
81e7009e SR |
1232 | #ifdef DEBUG_SIG |
1233 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1234 | regs, frame, newsp); | |
1da177e4 | 1235 | #endif |
d0c3d534 OJ |
1236 | if (show_unhandled_signals && printk_ratelimit()) |
1237 | printk(KERN_INFO "%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); | |
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: | |
d0c3d534 OJ |
1288 | if (show_unhandled_signals && printk_ratelimit()) |
1289 | printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: " | |
1290 | "%p nip %08lx lr %08lx\n", | |
1291 | current->comm, current->pid, | |
1292 | addr, regs->nip, regs->link); | |
1293 | ||
1da177e4 LT |
1294 | force_sig(SIGSEGV, current); |
1295 | return 0; | |
1296 | } |