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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> |
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 | ||
70 | /* | |
71 | * Returning 0 means we return to userspace via | |
72 | * ret_from_except and thus restore all user | |
73 | * registers from *regs. This is what we need | |
74 | * to do when a signal has been delivered. | |
75 | */ | |
81e7009e SR |
76 | |
77 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
78 | #undef __SIGNAL_FRAMESIZE | |
79 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
80 | #undef ELF_NVRREG | |
81 | #define ELF_NVRREG ELF_NVRREG32 | |
82 | ||
83 | /* | |
84 | * Functions for flipping sigsets (thanks to brain dead generic | |
85 | * implementation that makes things simple for little endian only) | |
86 | */ | |
87 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
88 | { | |
89 | compat_sigset_t cset; | |
90 | ||
91 | switch (_NSIG_WORDS) { | |
92 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
93 | cset.sig[7] = set->sig[3] >> 32; | |
94 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
95 | cset.sig[5] = set->sig[2] >> 32; | |
96 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
97 | cset.sig[3] = set->sig[1] >> 32; | |
98 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
99 | cset.sig[1] = set->sig[0] >> 32; | |
100 | } | |
101 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
102 | } | |
103 | ||
9b7cf8b4 PM |
104 | static inline int get_sigset_t(sigset_t *set, |
105 | const compat_sigset_t __user *uset) | |
81e7009e SR |
106 | { |
107 | compat_sigset_t s32; | |
108 | ||
109 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
110 | return -EFAULT; | |
111 | ||
112 | /* | |
113 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
114 | * in the "wrong" endian in 32-bit user storage). | |
115 | */ | |
116 | switch (_NSIG_WORDS) { | |
117 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
118 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
119 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
120 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
126 | struct old_sigaction __user *act) | |
127 | { | |
128 | compat_old_sigset_t mask; | |
129 | compat_uptr_t handler, restorer; | |
130 | ||
131 | if (get_user(handler, &act->sa_handler) || | |
132 | __get_user(restorer, &act->sa_restorer) || | |
133 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
134 | __get_user(mask, &act->sa_mask)) | |
135 | return -EFAULT; | |
136 | new_ka->sa.sa_handler = compat_ptr(handler); | |
137 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
138 | siginitset(&new_ka->sa.sa_mask, mask); | |
139 | return 0; | |
140 | } | |
141 | ||
29e646df | 142 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
143 | #define from_user_ptr(p) compat_ptr(p) |
144 | ||
145 | static inline int save_general_regs(struct pt_regs *regs, | |
146 | struct mcontext __user *frame) | |
147 | { | |
148 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
149 | int i; | |
150 | ||
1bd79336 | 151 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
152 | |
153 | for (i = 0; i <= PT_RESULT; i ++) { | |
154 | if (i == 14 && !FULL_REGS(regs)) | |
155 | i = 32; | |
81e7009e SR |
156 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
157 | return -EFAULT; | |
401d1f02 | 158 | } |
81e7009e SR |
159 | return 0; |
160 | } | |
161 | ||
162 | static inline int restore_general_regs(struct pt_regs *regs, | |
163 | struct mcontext __user *sr) | |
164 | { | |
165 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
166 | int i; | |
167 | ||
168 | for (i = 0; i <= PT_RESULT; i++) { | |
169 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
170 | continue; | |
171 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
172 | return -EFAULT; | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | ||
177 | #else /* CONFIG_PPC64 */ | |
178 | ||
81e7009e SR |
179 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
180 | ||
181 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
182 | { | |
183 | return copy_to_user(uset, set, sizeof(*uset)); | |
184 | } | |
185 | ||
9b7cf8b4 | 186 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
187 | { |
188 | return copy_from_user(set, uset, sizeof(*uset)); | |
189 | } | |
190 | ||
191 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
192 | struct old_sigaction __user *act) | |
193 | { | |
194 | old_sigset_t mask; | |
195 | ||
196 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
197 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
198 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
199 | return -EFAULT; | |
200 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
201 | __get_user(mask, &act->sa_mask); | |
202 | siginitset(&new_ka->sa.sa_mask, mask); | |
203 | return 0; | |
204 | } | |
205 | ||
29e646df AV |
206 | #define to_user_ptr(p) ((unsigned long)(p)) |
207 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
208 | |
209 | static inline int save_general_regs(struct pt_regs *regs, | |
210 | struct mcontext __user *frame) | |
211 | { | |
1bd79336 | 212 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
213 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
214 | } | |
215 | ||
216 | static inline int restore_general_regs(struct pt_regs *regs, | |
217 | struct mcontext __user *sr) | |
218 | { | |
219 | /* copy up to but not including MSR */ | |
220 | if (__copy_from_user(regs, &sr->mc_gregs, | |
221 | PT_MSR * sizeof(elf_greg_t))) | |
222 | return -EFAULT; | |
223 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
224 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
225 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
226 | return -EFAULT; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | #endif /* CONFIG_PPC64 */ | |
231 | ||
81e7009e SR |
232 | /* |
233 | * Atomically swap in the new signal mask, and wait for a signal. | |
234 | */ | |
150256d8 | 235 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 236 | { |
81e7009e SR |
237 | mask &= _BLOCKABLE; |
238 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 239 | current->saved_sigmask = current->blocked; |
81e7009e SR |
240 | siginitset(¤t->blocked, mask); |
241 | recalc_sigpending(); | |
242 | spin_unlock_irq(¤t->sighand->siglock); | |
243 | ||
150256d8 DW |
244 | current->state = TASK_INTERRUPTIBLE; |
245 | schedule(); | |
7a10174e | 246 | set_restore_sigmask(); |
150256d8 | 247 | return -ERESTARTNOHAND; |
81e7009e SR |
248 | } |
249 | ||
81e7009e SR |
250 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
251 | struct old_sigaction __user *oact) | |
252 | { | |
253 | struct k_sigaction new_ka, old_ka; | |
254 | int ret; | |
255 | ||
256 | #ifdef CONFIG_PPC64 | |
257 | if (sig < 0) | |
258 | sig = -sig; | |
259 | #endif | |
260 | ||
261 | if (act) { | |
262 | if (get_old_sigaction(&new_ka, act)) | |
263 | return -EFAULT; | |
264 | } | |
265 | ||
266 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
267 | if (!ret && oact) { | |
268 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
269 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
270 | &oact->sa_handler) || | |
271 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
272 | &oact->sa_restorer) || | |
273 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
274 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
275 | return -EFAULT; | |
276 | } | |
277 | ||
278 | return ret; | |
279 | } | |
1da177e4 LT |
280 | |
281 | /* | |
282 | * When we have signals to deliver, we set up on the | |
283 | * user stack, going down from the original stack pointer: | |
a3f61dc0 BH |
284 | * an ABI gap of 56 words |
285 | * an mcontext struct | |
81e7009e SR |
286 | * a sigcontext struct |
287 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 288 | * |
a3f61dc0 BH |
289 | * Each of these things must be a multiple of 16 bytes in size. The following |
290 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
291 | * |
292 | */ | |
a3f61dc0 BH |
293 | struct sigframe { |
294 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 295 | struct mcontext mctx; /* all the register values */ |
1da177e4 LT |
296 | /* |
297 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
298 | * regs and 18 fp regs below sp before decrementing it. | |
299 | */ | |
300 | int abigap[56]; | |
301 | }; | |
302 | ||
303 | /* We use the mc_pad field for the signal return trampoline. */ | |
304 | #define tramp mc_pad | |
305 | ||
306 | /* | |
307 | * When we have rt signals to deliver, we set up on the | |
308 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
309 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
310 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
311 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
312 | * positions as in older kernels). |
313 | * | |
314 | * Each of these things must be a multiple of 16 bytes in size. | |
315 | * | |
316 | */ | |
81e7009e SR |
317 | struct rt_sigframe { |
318 | #ifdef CONFIG_PPC64 | |
319 | compat_siginfo_t info; | |
320 | #else | |
321 | struct siginfo info; | |
322 | #endif | |
323 | struct ucontext uc; | |
1da177e4 LT |
324 | /* |
325 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
326 | * regs and 18 fp regs below sp before decrementing it. | |
327 | */ | |
328 | int abigap[56]; | |
329 | }; | |
330 | ||
6a274c08 MN |
331 | #ifdef CONFIG_VSX |
332 | unsigned long copy_fpr_to_user(void __user *to, | |
333 | struct task_struct *task) | |
334 | { | |
335 | double buf[ELF_NFPREG]; | |
336 | int i; | |
337 | ||
338 | /* save FPR copy to local buffer then write to the thread_struct */ | |
339 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
340 | buf[i] = task->thread.TS_FPR(i); | |
341 | memcpy(&buf[i], &task->thread.fpscr, sizeof(double)); | |
342 | return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double)); | |
343 | } | |
344 | ||
345 | unsigned long copy_fpr_from_user(struct task_struct *task, | |
346 | void __user *from) | |
347 | { | |
348 | double buf[ELF_NFPREG]; | |
349 | int i; | |
350 | ||
351 | if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double))) | |
352 | return 1; | |
353 | for (i = 0; i < (ELF_NFPREG - 1) ; i++) | |
354 | task->thread.TS_FPR(i) = buf[i]; | |
355 | memcpy(&task->thread.fpscr, &buf[i], sizeof(double)); | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | unsigned long copy_vsx_to_user(void __user *to, | |
361 | struct task_struct *task) | |
362 | { | |
363 | double buf[ELF_NVSRHALFREG]; | |
364 | int i; | |
365 | ||
366 | /* save FPR copy to local buffer then write to the thread_struct */ | |
367 | for (i = 0; i < ELF_NVSRHALFREG; i++) | |
368 | buf[i] = task->thread.fpr[i][TS_VSRLOWOFFSET]; | |
369 | return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double)); | |
370 | } | |
371 | ||
372 | unsigned long copy_vsx_from_user(struct task_struct *task, | |
373 | void __user *from) | |
374 | { | |
375 | double buf[ELF_NVSRHALFREG]; | |
376 | int i; | |
377 | ||
378 | if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double))) | |
379 | return 1; | |
380 | for (i = 0; i < ELF_NVSRHALFREG ; i++) | |
381 | task->thread.fpr[i][TS_VSRLOWOFFSET] = buf[i]; | |
382 | return 0; | |
383 | } | |
384 | #else | |
385 | inline unsigned long copy_fpr_to_user(void __user *to, | |
386 | struct task_struct *task) | |
387 | { | |
388 | return __copy_to_user(to, task->thread.fpr, | |
389 | ELF_NFPREG * sizeof(double)); | |
390 | } | |
391 | ||
392 | inline unsigned long copy_fpr_from_user(struct task_struct *task, | |
393 | void __user *from) | |
394 | { | |
395 | return __copy_from_user(task->thread.fpr, from, | |
396 | ELF_NFPREG * sizeof(double)); | |
397 | } | |
398 | #endif | |
399 | ||
1da177e4 LT |
400 | /* |
401 | * Save the current user registers on the user stack. | |
81e7009e SR |
402 | * We only save the altivec/spe registers if the process has used |
403 | * altivec/spe instructions at some point. | |
1da177e4 | 404 | */ |
81e7009e SR |
405 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
406 | int sigret) | |
1da177e4 | 407 | { |
9e751186 MN |
408 | unsigned long msr = regs->msr; |
409 | ||
1da177e4 LT |
410 | /* Make sure floating point registers are stored in regs */ |
411 | flush_fp_to_thread(current); | |
412 | ||
c6e6771b MN |
413 | /* save general registers */ |
414 | if (save_general_regs(regs, frame)) | |
1da177e4 LT |
415 | return 1; |
416 | ||
1da177e4 LT |
417 | #ifdef CONFIG_ALTIVEC |
418 | /* save altivec registers */ | |
419 | if (current->thread.used_vr) { | |
420 | flush_altivec_to_thread(current); | |
421 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 422 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
423 | return 1; |
424 | /* set MSR_VEC in the saved MSR value to indicate that | |
425 | frame->mc_vregs contains valid data */ | |
9e751186 | 426 | msr |= MSR_VEC; |
1da177e4 LT |
427 | } |
428 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
429 | ||
430 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
431 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
432 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
433 | * most significant bits of that same vector. --BenH | |
434 | */ | |
435 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
436 | return 1; | |
437 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 | 438 | if (copy_fpr_to_user(&frame->mc_fregs, current)) |
c6e6771b | 439 | return 1; |
6a274c08 | 440 | #ifdef CONFIG_VSX |
ce48b210 MN |
441 | /* |
442 | * Copy VSR 0-31 upper half from thread_struct to local | |
443 | * buffer, then write that to userspace. Also set MSR_VSX in | |
444 | * the saved MSR value to indicate that frame->mc_vregs | |
445 | * contains valid data | |
446 | */ | |
447 | if (current->thread.used_vsr) { | |
448 | flush_vsx_to_thread(current); | |
6a274c08 | 449 | if (copy_vsx_to_user(&frame->mc_vsregs, current)) |
ce48b210 MN |
450 | return 1; |
451 | msr |= MSR_VSX; | |
452 | } | |
c6e6771b | 453 | #endif /* CONFIG_VSX */ |
81e7009e SR |
454 | #ifdef CONFIG_SPE |
455 | /* save spe registers */ | |
456 | if (current->thread.used_spe) { | |
457 | flush_spe_to_thread(current); | |
458 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
459 | ELF_NEVRREG * sizeof(u32))) | |
460 | return 1; | |
461 | /* set MSR_SPE in the saved MSR value to indicate that | |
462 | frame->mc_vregs contains valid data */ | |
9e751186 | 463 | msr |= MSR_SPE; |
81e7009e SR |
464 | } |
465 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
466 | ||
467 | /* We always copy to/from spefscr */ | |
468 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
469 | return 1; | |
470 | #endif /* CONFIG_SPE */ | |
471 | ||
9e751186 MN |
472 | if (__put_user(msr, &frame->mc_gregs[PT_MSR])) |
473 | return 1; | |
1da177e4 LT |
474 | if (sigret) { |
475 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
476 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
477 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
478 | return 1; | |
479 | flush_icache_range((unsigned long) &frame->tramp[0], | |
480 | (unsigned long) &frame->tramp[2]); | |
481 | } | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Restore the current user register values from the user stack, | |
488 | * (except for MSR). | |
489 | */ | |
490 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 491 | struct mcontext __user *sr, int sig) |
1da177e4 | 492 | { |
81e7009e | 493 | long err; |
1da177e4 | 494 | unsigned int save_r2 = 0; |
1da177e4 | 495 | unsigned long msr; |
c6e6771b | 496 | #ifdef CONFIG_VSX |
c6e6771b MN |
497 | int i; |
498 | #endif | |
1da177e4 LT |
499 | |
500 | /* | |
501 | * restore general registers but not including MSR or SOFTE. Also | |
502 | * take care of keeping r2 (TLS) intact if not a signal | |
503 | */ | |
504 | if (!sig) | |
505 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 506 | err = restore_general_regs(regs, sr); |
fab5db97 | 507 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
508 | if (!sig) |
509 | regs->gpr[2] = (unsigned long) save_r2; | |
510 | if (err) | |
511 | return 1; | |
512 | ||
fab5db97 PM |
513 | /* if doing signal return, restore the previous little-endian mode */ |
514 | if (sig) | |
515 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
516 | ||
5388fb10 PM |
517 | /* |
518 | * Do this before updating the thread state in | |
519 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
520 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
521 | * tempted to save the current CPU state into the thread_struct | |
522 | * and corrupt what we are writing there. | |
523 | */ | |
524 | discard_lazy_cpu_state(); | |
525 | ||
1da177e4 | 526 | #ifdef CONFIG_ALTIVEC |
c6e6771b MN |
527 | /* |
528 | * Force the process to reload the altivec registers from | |
529 | * current->thread when it next does altivec instructions | |
530 | */ | |
1da177e4 | 531 | regs->msr &= ~MSR_VEC; |
fab5db97 | 532 | if (msr & MSR_VEC) { |
1da177e4 LT |
533 | /* restore altivec registers from the stack */ |
534 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
535 | sizeof(sr->mc_vregs))) | |
536 | return 1; | |
537 | } else if (current->thread.used_vr) | |
81e7009e | 538 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
539 | |
540 | /* Always get VRSAVE back */ | |
541 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
542 | return 1; | |
543 | #endif /* CONFIG_ALTIVEC */ | |
6a274c08 MN |
544 | if (copy_fpr_from_user(current, &sr->mc_fregs)) |
545 | return 1; | |
1da177e4 | 546 | |
c6e6771b | 547 | #ifdef CONFIG_VSX |
ce48b210 MN |
548 | /* |
549 | * Force the process to reload the VSX registers from | |
550 | * current->thread when it next does VSX instruction. | |
551 | */ | |
552 | regs->msr &= ~MSR_VSX; | |
553 | if (msr & MSR_VSX) { | |
554 | /* | |
555 | * Restore altivec registers from the stack to a local | |
556 | * buffer, then write this out to the thread_struct | |
557 | */ | |
6a274c08 | 558 | if (copy_vsx_from_user(current, &sr->mc_vsregs)) |
ce48b210 | 559 | return 1; |
ce48b210 MN |
560 | } else if (current->thread.used_vsr) |
561 | for (i = 0; i < 32 ; i++) | |
562 | current->thread.fpr[i][TS_VSRLOWOFFSET] = 0; | |
c6e6771b MN |
563 | #endif /* CONFIG_VSX */ |
564 | /* | |
565 | * force the process to reload the FP registers from | |
566 | * current->thread when it next does FP instructions | |
567 | */ | |
568 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
569 | ||
81e7009e SR |
570 | #ifdef CONFIG_SPE |
571 | /* force the process to reload the spe registers from | |
572 | current->thread when it next does spe instructions */ | |
573 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 574 | if (msr & MSR_SPE) { |
81e7009e SR |
575 | /* restore spe registers from the stack */ |
576 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
577 | ELF_NEVRREG * sizeof(u32))) | |
578 | return 1; | |
579 | } else if (current->thread.used_spe) | |
580 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
581 | ||
582 | /* Always get SPEFSCR back */ | |
583 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
584 | return 1; | |
585 | #endif /* CONFIG_SPE */ | |
586 | ||
1da177e4 LT |
587 | return 0; |
588 | } | |
589 | ||
81e7009e | 590 | #ifdef CONFIG_PPC64 |
b09a4913 | 591 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
592 | struct sigaction32 __user *oact, size_t sigsetsize) |
593 | { | |
594 | struct k_sigaction new_ka, old_ka; | |
595 | int ret; | |
1da177e4 LT |
596 | |
597 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
598 | if (sigsetsize != sizeof(compat_sigset_t)) | |
599 | return -EINVAL; | |
600 | ||
601 | if (act) { | |
602 | compat_uptr_t handler; | |
603 | ||
604 | ret = get_user(handler, &act->sa_handler); | |
605 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 606 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
607 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
608 | if (ret) | |
609 | return -EFAULT; | |
610 | } | |
611 | ||
612 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
613 | if (!ret && oact) { | |
29e646df | 614 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 615 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
616 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
617 | } | |
618 | return ret; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Note: it is necessary to treat how as an unsigned int, with the | |
623 | * corresponding cast to a signed int to insure that the proper | |
624 | * conversion (sign extension) between the register representation | |
625 | * of a signed int (msr in 32-bit mode) and the register representation | |
626 | * of a signed int (msr in 64-bit mode) is performed. | |
627 | */ | |
b09a4913 | 628 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
629 | compat_sigset_t __user *oset, size_t sigsetsize) |
630 | { | |
631 | sigset_t s; | |
632 | sigset_t __user *up; | |
1da177e4 LT |
633 | int ret; |
634 | mm_segment_t old_fs = get_fs(); | |
635 | ||
636 | if (set) { | |
81e7009e SR |
637 | if (get_sigset_t(&s, set)) |
638 | return -EFAULT; | |
1da177e4 | 639 | } |
81e7009e | 640 | |
1da177e4 LT |
641 | set_fs(KERNEL_DS); |
642 | /* This is valid because of the set_fs() */ | |
643 | up = (sigset_t __user *) &s; | |
644 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 645 | sigsetsize); |
1da177e4 LT |
646 | set_fs(old_fs); |
647 | if (ret) | |
648 | return ret; | |
649 | if (oset) { | |
81e7009e | 650 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
651 | return -EFAULT; |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
b09a4913 | 656 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
657 | { |
658 | sigset_t s; | |
1da177e4 LT |
659 | int ret; |
660 | mm_segment_t old_fs = get_fs(); | |
661 | ||
662 | set_fs(KERNEL_DS); | |
663 | /* The __user pointer cast is valid because of the set_fs() */ | |
664 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
665 | set_fs(old_fs); | |
666 | if (!ret) { | |
81e7009e | 667 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
668 | return -EFAULT; |
669 | } | |
670 | return ret; | |
671 | } | |
672 | ||
673 | ||
674 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
675 | { | |
676 | int err; | |
677 | ||
678 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
679 | return -EFAULT; | |
680 | ||
681 | /* If you change siginfo_t structure, please be sure | |
682 | * this code is fixed accordingly. | |
683 | * It should never copy any pad contained in the structure | |
684 | * to avoid security leaks, but must copy the generic | |
685 | * 3 ints plus the relevant union member. | |
686 | * This routine must convert siginfo from 64bit to 32bit as well | |
687 | * at the same time. | |
688 | */ | |
689 | err = __put_user(s->si_signo, &d->si_signo); | |
690 | err |= __put_user(s->si_errno, &d->si_errno); | |
691 | err |= __put_user((short)s->si_code, &d->si_code); | |
692 | if (s->si_code < 0) | |
693 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
694 | SI_PAD_SIZE32); | |
695 | else switch(s->si_code >> 16) { | |
696 | case __SI_CHLD >> 16: | |
697 | err |= __put_user(s->si_pid, &d->si_pid); | |
698 | err |= __put_user(s->si_uid, &d->si_uid); | |
699 | err |= __put_user(s->si_utime, &d->si_utime); | |
700 | err |= __put_user(s->si_stime, &d->si_stime); | |
701 | err |= __put_user(s->si_status, &d->si_status); | |
702 | break; | |
703 | case __SI_FAULT >> 16: | |
704 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
705 | &d->si_addr); | |
706 | break; | |
707 | case __SI_POLL >> 16: | |
708 | err |= __put_user(s->si_band, &d->si_band); | |
709 | err |= __put_user(s->si_fd, &d->si_fd); | |
710 | break; | |
711 | case __SI_TIMER >> 16: | |
712 | err |= __put_user(s->si_tid, &d->si_tid); | |
713 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
714 | err |= __put_user(s->si_int, &d->si_int); | |
715 | break; | |
716 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
717 | case __SI_MESGQ >> 16: | |
718 | err |= __put_user(s->si_int, &d->si_int); | |
719 | /* fallthrough */ | |
720 | case __SI_KILL >> 16: | |
721 | default: | |
722 | err |= __put_user(s->si_pid, &d->si_pid); | |
723 | err |= __put_user(s->si_uid, &d->si_uid); | |
724 | break; | |
725 | } | |
726 | return err; | |
727 | } | |
728 | ||
81e7009e SR |
729 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
730 | ||
9c0c44db RM |
731 | int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from) |
732 | { | |
733 | memset(to, 0, sizeof *to); | |
734 | ||
735 | if (copy_from_user(to, from, 3*sizeof(int)) || | |
736 | copy_from_user(to->_sifields._pad, | |
737 | from->_sifields._pad, SI_PAD_SIZE32)) | |
738 | return -EFAULT; | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
1da177e4 LT |
743 | /* |
744 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
745 | * corresponding cast to a signed int to insure that the proper conversion | |
746 | * (sign extension) between the register representation of a signed int | |
747 | * (msr in 32-bit mode) and the register representation of a signed int | |
748 | * (msr in 64-bit mode) is performed. | |
749 | */ | |
b09a4913 | 750 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
751 | { |
752 | siginfo_t info; | |
753 | int ret; | |
754 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 755 | |
9c0c44db RM |
756 | ret = copy_siginfo_from_user32(&info, uinfo); |
757 | if (unlikely(ret)) | |
758 | return ret; | |
759 | ||
1da177e4 LT |
760 | set_fs (KERNEL_DS); |
761 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
762 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
763 | set_fs (old_fs); | |
764 | return ret; | |
765 | } | |
1da177e4 LT |
766 | /* |
767 | * Start Alternate signal stack support | |
768 | * | |
769 | * System Calls | |
b09a4913 | 770 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
771 | */ |
772 | ||
b09a4913 | 773 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
774 | int r6, int r7, int r8, struct pt_regs *regs) |
775 | { | |
29e646df AV |
776 | stack_32_t __user * newstack = compat_ptr(__new); |
777 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
778 | stack_t uss, uoss; |
779 | int ret; | |
780 | mm_segment_t old_fs; | |
781 | unsigned long sp; | |
782 | compat_uptr_t ss_sp; | |
783 | ||
784 | /* | |
785 | * set sp to the user stack on entry to the system call | |
786 | * the system call router sets R9 to the saved registers | |
787 | */ | |
788 | sp = regs->gpr[1]; | |
789 | ||
790 | /* Put new stack info in local 64 bit stack struct */ | |
791 | if (newstack) { | |
792 | if (get_user(ss_sp, &newstack->ss_sp) || | |
793 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
794 | __get_user(uss.ss_size, &newstack->ss_size)) | |
795 | return -EFAULT; | |
796 | uss.ss_sp = compat_ptr(ss_sp); | |
797 | } | |
798 | ||
799 | old_fs = get_fs(); | |
800 | set_fs(KERNEL_DS); | |
801 | /* The __user pointer casts are valid because of the set_fs() */ | |
802 | ret = do_sigaltstack( | |
803 | newstack ? (stack_t __user *) &uss : NULL, | |
804 | oldstack ? (stack_t __user *) &uoss : NULL, | |
805 | sp); | |
806 | set_fs(old_fs); | |
807 | /* Copy the stack information to the user output buffer */ | |
808 | if (!ret && oldstack && | |
29e646df | 809 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
810 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
811 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
812 | return -EFAULT; | |
813 | return ret; | |
814 | } | |
81e7009e | 815 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 816 | |
1da177e4 LT |
817 | /* |
818 | * Set up a signal frame for a "real-time" signal handler | |
819 | * (one which gets siginfo). | |
820 | */ | |
f478f543 | 821 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e | 822 | siginfo_t *info, sigset_t *oldset, |
a3f61dc0 | 823 | struct pt_regs *regs) |
1da177e4 | 824 | { |
81e7009e SR |
825 | struct rt_sigframe __user *rt_sf; |
826 | struct mcontext __user *frame; | |
d0c3d534 | 827 | void __user *addr; |
a3f61dc0 | 828 | unsigned long newsp = 0; |
1da177e4 LT |
829 | |
830 | /* Set up Signal Frame */ | |
831 | /* Put a Real Time Context onto stack */ | |
a3f61dc0 | 832 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf)); |
d0c3d534 | 833 | addr = rt_sf; |
a3f61dc0 | 834 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
835 | goto badframe; |
836 | ||
1da177e4 | 837 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 838 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
839 | || __put_user(0, &rt_sf->uc.uc_flags) |
840 | || __put_user(0, &rt_sf->uc.uc_link) | |
841 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
842 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
843 | &rt_sf->uc.uc_stack.ss_flags) | |
844 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
845 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
846 | &rt_sf->uc.uc_regs) | |
847 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
848 | goto badframe; |
849 | ||
850 | /* Save user registers on the stack */ | |
851 | frame = &rt_sf->uc.uc_mcontext; | |
d0c3d534 | 852 | addr = frame; |
a5bba930 | 853 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
854 | if (save_user_regs(regs, frame, 0)) |
855 | goto badframe; | |
a5bba930 | 856 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 857 | } else { |
1da177e4 LT |
858 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
859 | goto badframe; | |
860 | regs->link = (unsigned long) frame->tramp; | |
861 | } | |
cc657f53 PM |
862 | |
863 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
864 | ||
a3f61dc0 BH |
865 | /* create a stack frame for the caller of the handler */ |
866 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 867 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 868 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 869 | goto badframe; |
a3f61dc0 BH |
870 | |
871 | /* Fill registers for signal handler */ | |
81e7009e | 872 | regs->gpr[1] = newsp; |
1da177e4 LT |
873 | regs->gpr[3] = sig; |
874 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
875 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
876 | regs->gpr[6] = (unsigned long) rt_sf; | |
877 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
878 | /* enter the signal handler in big-endian mode */ |
879 | regs->msr &= ~MSR_LE; | |
1da177e4 | 880 | regs->trap = 0; |
1da177e4 LT |
881 | return 1; |
882 | ||
883 | badframe: | |
81e7009e | 884 | #ifdef DEBUG_SIG |
1da177e4 LT |
885 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
886 | regs, frame, newsp); | |
887 | #endif | |
d0c3d534 OJ |
888 | if (show_unhandled_signals && printk_ratelimit()) |
889 | printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: " | |
890 | "%p nip %08lx lr %08lx\n", | |
891 | current->comm, current->pid, | |
892 | addr, regs->nip, regs->link); | |
893 | ||
1da177e4 LT |
894 | force_sigsegv(sig, current); |
895 | return 0; | |
896 | } | |
897 | ||
81e7009e | 898 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 899 | { |
1da177e4 | 900 | sigset_t set; |
81e7009e SR |
901 | struct mcontext __user *mcp; |
902 | ||
903 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
904 | return -EFAULT; | |
905 | #ifdef CONFIG_PPC64 | |
906 | { | |
907 | u32 cmcp; | |
1da177e4 | 908 | |
81e7009e SR |
909 | if (__get_user(cmcp, &ucp->uc_regs)) |
910 | return -EFAULT; | |
911 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 912 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
913 | } |
914 | #else | |
915 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 916 | return -EFAULT; |
7c85d1f9 PM |
917 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
918 | return -EFAULT; | |
81e7009e | 919 | #endif |
1da177e4 | 920 | restore_sigmask(&set); |
81e7009e | 921 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
922 | return -EFAULT; |
923 | ||
924 | return 0; | |
925 | } | |
926 | ||
81e7009e | 927 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
928 | struct ucontext __user *new_ctx, |
929 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
930 | { |
931 | unsigned char tmp; | |
1da177e4 LT |
932 | |
933 | /* Context size is for future use. Right now, we only make sure | |
934 | * we are passed something we understand | |
935 | */ | |
81e7009e | 936 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
937 | return -EINVAL; |
938 | ||
939 | if (old_ctx != NULL) { | |
1c9bb1a0 PM |
940 | struct mcontext __user *mctx; |
941 | ||
942 | /* | |
943 | * old_ctx might not be 16-byte aligned, in which | |
944 | * case old_ctx->uc_mcontext won't be either. | |
945 | * Because we have the old_ctx->uc_pad2 field | |
946 | * before old_ctx->uc_mcontext, we need to round down | |
947 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
948 | */ | |
949 | mctx = (struct mcontext __user *) | |
950 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
1da177e4 | 951 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
1c9bb1a0 | 952 | || save_user_regs(regs, mctx, 0) |
81e7009e | 953 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 954 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
955 | return -EFAULT; |
956 | } | |
957 | if (new_ctx == NULL) | |
958 | return 0; | |
959 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
960 | || __get_user(tmp, (u8 __user *) new_ctx) | |
961 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
962 | return -EFAULT; | |
963 | ||
964 | /* | |
965 | * If we get a fault copying the context into the kernel's | |
966 | * image of the user's registers, we can't just return -EFAULT | |
967 | * because the user's registers will be corrupted. For instance | |
968 | * the NIP value may have been updated but not some of the | |
969 | * other registers. Given that we have done the access_ok | |
970 | * and successfully read the first and last bytes of the region | |
971 | * above, this should only happen in an out-of-memory situation | |
972 | * or if another thread unmaps the region containing the context. | |
973 | * We kill the task with a SIGSEGV in this situation. | |
974 | */ | |
81e7009e | 975 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 976 | do_exit(SIGSEGV); |
401d1f02 DW |
977 | |
978 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
979 | return 0; |
980 | } | |
981 | ||
81e7009e | 982 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
983 | struct pt_regs *regs) |
984 | { | |
81e7009e | 985 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
986 | |
987 | /* Always make any pending restarted system calls return -EINTR */ | |
988 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
989 | ||
81e7009e SR |
990 | rt_sf = (struct rt_sigframe __user *) |
991 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
992 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
993 | goto bad; | |
81e7009e | 994 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
995 | goto bad; |
996 | ||
997 | /* | |
998 | * It's not clear whether or why it is desirable to save the | |
999 | * sigaltstack setting on signal delivery and restore it on | |
1000 | * signal return. But other architectures do this and we have | |
1001 | * always done it up until now so it is probably better not to | |
1002 | * change it. -- paulus | |
81e7009e SR |
1003 | */ |
1004 | #ifdef CONFIG_PPC64 | |
1005 | /* | |
b09a4913 | 1006 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
1007 | * and takes userland pointer directly. What about error checking ? |
1008 | * nobody does any... | |
1009 | */ | |
b09a4913 | 1010 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
1011 | #else |
1012 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 1013 | #endif |
401d1f02 DW |
1014 | set_thread_flag(TIF_RESTOREALL); |
1015 | return 0; | |
1da177e4 LT |
1016 | |
1017 | bad: | |
d0c3d534 OJ |
1018 | if (show_unhandled_signals && printk_ratelimit()) |
1019 | printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: " | |
1020 | "%p nip %08lx lr %08lx\n", | |
1021 | current->comm, current->pid, | |
1022 | rt_sf, regs->nip, regs->link); | |
1023 | ||
1da177e4 LT |
1024 | force_sig(SIGSEGV, current); |
1025 | return 0; | |
1026 | } | |
1027 | ||
81e7009e SR |
1028 | #ifdef CONFIG_PPC32 |
1029 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
1030 | int ndbg, struct sig_dbg_op __user *dbg, | |
1031 | int r6, int r7, int r8, | |
1032 | struct pt_regs *regs) | |
1033 | { | |
1034 | struct sig_dbg_op op; | |
1035 | int i; | |
7c85d1f9 | 1036 | unsigned char tmp; |
81e7009e SR |
1037 | unsigned long new_msr = regs->msr; |
1038 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1039 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
1040 | #endif | |
1041 | ||
1042 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 1043 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
1044 | return -EFAULT; |
1045 | switch (op.dbg_type) { | |
1046 | case SIG_DBG_SINGLE_STEPPING: | |
1047 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1048 | if (op.dbg_value) { | |
1049 | new_msr |= MSR_DE; | |
1050 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
1051 | } else { | |
1052 | new_msr &= ~MSR_DE; | |
1053 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
1054 | } | |
1055 | #else | |
1056 | if (op.dbg_value) | |
1057 | new_msr |= MSR_SE; | |
1058 | else | |
1059 | new_msr &= ~MSR_SE; | |
1060 | #endif | |
1061 | break; | |
1062 | case SIG_DBG_BRANCH_TRACING: | |
1063 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1064 | return -EINVAL; | |
1065 | #else | |
1066 | if (op.dbg_value) | |
1067 | new_msr |= MSR_BE; | |
1068 | else | |
1069 | new_msr &= ~MSR_BE; | |
1070 | #endif | |
1071 | break; | |
1072 | ||
1073 | default: | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* We wait until here to actually install the values in the | |
1079 | registers so if we fail in the above loop, it will not | |
1080 | affect the contents of these registers. After this point, | |
1081 | failure is a problem, anyway, and it's very unlikely unless | |
1082 | the user is really doing something wrong. */ | |
1083 | regs->msr = new_msr; | |
1084 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
1085 | current->thread.dbcr0 = new_dbcr0; | |
1086 | #endif | |
1087 | ||
7c85d1f9 PM |
1088 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
1089 | || __get_user(tmp, (u8 __user *) ctx) | |
1090 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
1091 | return -EFAULT; | |
1092 | ||
81e7009e SR |
1093 | /* |
1094 | * If we get a fault copying the context into the kernel's | |
1095 | * image of the user's registers, we can't just return -EFAULT | |
1096 | * because the user's registers will be corrupted. For instance | |
1097 | * the NIP value may have been updated but not some of the | |
1098 | * other registers. Given that we have done the access_ok | |
1099 | * and successfully read the first and last bytes of the region | |
1100 | * above, this should only happen in an out-of-memory situation | |
1101 | * or if another thread unmaps the region containing the context. | |
1102 | * We kill the task with a SIGSEGV in this situation. | |
1103 | */ | |
1104 | if (do_setcontext(ctx, regs, 1)) { | |
d0c3d534 OJ |
1105 | if (show_unhandled_signals && printk_ratelimit()) |
1106 | printk(KERN_INFO "%s[%d]: bad frame in " | |
1107 | "sys_debug_setcontext: %p nip %08lx " | |
1108 | "lr %08lx\n", | |
1109 | current->comm, current->pid, | |
1110 | ctx, regs->nip, regs->link); | |
1111 | ||
81e7009e SR |
1112 | force_sig(SIGSEGV, current); |
1113 | goto out; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * It's not clear whether or why it is desirable to save the | |
1118 | * sigaltstack setting on signal delivery and restore it on | |
1119 | * signal return. But other architectures do this and we have | |
1120 | * always done it up until now so it is probably better not to | |
1121 | * change it. -- paulus | |
1122 | */ | |
1123 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1124 | ||
401d1f02 | 1125 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1126 | out: |
1127 | return 0; | |
1128 | } | |
1129 | #endif | |
1da177e4 LT |
1130 | |
1131 | /* | |
1132 | * OK, we're invoking a handler | |
1133 | */ | |
f478f543 | 1134 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
a3f61dc0 | 1135 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 1136 | { |
81e7009e | 1137 | struct sigcontext __user *sc; |
a3f61dc0 BH |
1138 | struct sigframe __user *frame; |
1139 | unsigned long newsp = 0; | |
1da177e4 LT |
1140 | |
1141 | /* Set up Signal Frame */ | |
a3f61dc0 BH |
1142 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
1143 | if (unlikely(frame == NULL)) | |
1da177e4 | 1144 | goto badframe; |
a3f61dc0 | 1145 | sc = (struct sigcontext __user *) &frame->sctx; |
1da177e4 LT |
1146 | |
1147 | #if _NSIG != 64 | |
81e7009e | 1148 | #error "Please adjust handle_signal()" |
1da177e4 | 1149 | #endif |
81e7009e | 1150 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1151 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1152 | #ifdef CONFIG_PPC64 |
1da177e4 | 1153 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1154 | #else |
1155 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1156 | #endif | |
a3f61dc0 | 1157 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
1da177e4 LT |
1158 | || __put_user(sig, &sc->signal)) |
1159 | goto badframe; | |
1160 | ||
a5bba930 | 1161 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
1162 | if (save_user_regs(regs, &frame->mctx, 0)) |
1163 | goto badframe; | |
a5bba930 | 1164 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1165 | } else { |
1da177e4 LT |
1166 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1167 | goto badframe; | |
1168 | regs->link = (unsigned long) frame->mctx.tramp; | |
1169 | } | |
1170 | ||
cc657f53 PM |
1171 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1172 | ||
a3f61dc0 BH |
1173 | /* create a stack frame for the caller of the handler */ |
1174 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; | |
9747dd6f | 1175 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1176 | goto badframe; |
a3f61dc0 | 1177 | |
81e7009e | 1178 | regs->gpr[1] = newsp; |
1da177e4 LT |
1179 | regs->gpr[3] = sig; |
1180 | regs->gpr[4] = (unsigned long) sc; | |
1181 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1182 | /* enter the signal handler in big-endian mode */ |
1183 | regs->msr &= ~MSR_LE; | |
1da177e4 | 1184 | regs->trap = 0; |
1da177e4 LT |
1185 | |
1186 | return 1; | |
1187 | ||
1188 | badframe: | |
81e7009e SR |
1189 | #ifdef DEBUG_SIG |
1190 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1191 | regs, frame, newsp); | |
1da177e4 | 1192 | #endif |
d0c3d534 OJ |
1193 | if (show_unhandled_signals && printk_ratelimit()) |
1194 | printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: " | |
1195 | "%p nip %08lx lr %08lx\n", | |
1196 | current->comm, current->pid, | |
1197 | frame, regs->nip, regs->link); | |
1198 | ||
1da177e4 LT |
1199 | force_sigsegv(sig, current); |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * Do a signal return; undo the signal stack. | |
1205 | */ | |
81e7009e | 1206 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1207 | struct pt_regs *regs) |
1208 | { | |
81e7009e SR |
1209 | struct sigcontext __user *sc; |
1210 | struct sigcontext sigctx; | |
1211 | struct mcontext __user *sr; | |
d0c3d534 | 1212 | void __user *addr; |
1da177e4 | 1213 | sigset_t set; |
1da177e4 LT |
1214 | |
1215 | /* Always make any pending restarted system calls return -EINTR */ | |
1216 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1217 | ||
81e7009e | 1218 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
d0c3d534 | 1219 | addr = sc; |
1da177e4 LT |
1220 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1221 | goto badframe; | |
1222 | ||
81e7009e | 1223 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1224 | /* |
1225 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1226 | * unused part of the signal stackframe | |
1227 | */ | |
1228 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1229 | #else |
1230 | set.sig[0] = sigctx.oldmask; | |
1231 | set.sig[1] = sigctx._unused[3]; | |
1232 | #endif | |
1da177e4 LT |
1233 | restore_sigmask(&set); |
1234 | ||
81e7009e | 1235 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
d0c3d534 | 1236 | addr = sr; |
1da177e4 LT |
1237 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1238 | || restore_user_regs(regs, sr, 1)) | |
1239 | goto badframe; | |
1240 | ||
401d1f02 | 1241 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1242 | return 0; |
1da177e4 LT |
1243 | |
1244 | badframe: | |
d0c3d534 OJ |
1245 | if (show_unhandled_signals && printk_ratelimit()) |
1246 | printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: " | |
1247 | "%p nip %08lx lr %08lx\n", | |
1248 | current->comm, current->pid, | |
1249 | addr, regs->nip, regs->link); | |
1250 | ||
1da177e4 LT |
1251 | force_sig(SIGSEGV, current); |
1252 | return 0; | |
1253 | } |