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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> | |
81e7009e SR |
27 | #ifdef CONFIG_PPC64 |
28 | #include <linux/syscalls.h> | |
1da177e4 LT |
29 | #include <linux/compat.h> |
30 | #include <linux/ptrace.h> | |
81e7009e SR |
31 | #else |
32 | #include <linux/wait.h> | |
33 | #include <linux/ptrace.h> | |
34 | #include <linux/unistd.h> | |
35 | #include <linux/stddef.h> | |
36 | #include <linux/tty.h> | |
37 | #include <linux/binfmts.h> | |
7dfb7103 | 38 | #include <linux/freezer.h> |
81e7009e SR |
39 | #endif |
40 | ||
1da177e4 | 41 | #include <asm/uaccess.h> |
81e7009e | 42 | #include <asm/cacheflush.h> |
a7f31841 | 43 | #include <asm/syscalls.h> |
c5ff7001 | 44 | #include <asm/sigcontext.h> |
a7f290da | 45 | #include <asm/vdso.h> |
81e7009e | 46 | #ifdef CONFIG_PPC64 |
879168ee | 47 | #include "ppc32.h" |
1da177e4 | 48 | #include <asm/unistd.h> |
81e7009e SR |
49 | #else |
50 | #include <asm/ucontext.h> | |
51 | #include <asm/pgtable.h> | |
52 | #endif | |
1da177e4 | 53 | |
22e38f29 BH |
54 | #include "signal.h" |
55 | ||
81e7009e | 56 | #undef DEBUG_SIG |
1da177e4 | 57 | |
81e7009e | 58 | #ifdef CONFIG_PPC64 |
b09a4913 SR |
59 | #define sys_sigsuspend compat_sys_sigsuspend |
60 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
61 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
62 | #define sys_sigaction compat_sys_sigaction | |
63 | #define sys_swapcontext compat_sys_swapcontext | |
64 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
65 | |
66 | #define old_sigaction old_sigaction32 | |
67 | #define sigcontext sigcontext32 | |
68 | #define mcontext mcontext32 | |
69 | #define ucontext ucontext32 | |
70 | ||
71 | /* | |
72 | * Returning 0 means we return to userspace via | |
73 | * ret_from_except and thus restore all user | |
74 | * registers from *regs. This is what we need | |
75 | * to do when a signal has been delivered. | |
76 | */ | |
81e7009e SR |
77 | |
78 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
79 | #undef __SIGNAL_FRAMESIZE | |
80 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
81 | #undef ELF_NVRREG | |
82 | #define ELF_NVRREG ELF_NVRREG32 | |
83 | ||
84 | /* | |
85 | * Functions for flipping sigsets (thanks to brain dead generic | |
86 | * implementation that makes things simple for little endian only) | |
87 | */ | |
88 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
89 | { | |
90 | compat_sigset_t cset; | |
91 | ||
92 | switch (_NSIG_WORDS) { | |
93 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
94 | cset.sig[7] = set->sig[3] >> 32; | |
95 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
96 | cset.sig[5] = set->sig[2] >> 32; | |
97 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
98 | cset.sig[3] = set->sig[1] >> 32; | |
99 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
100 | cset.sig[1] = set->sig[0] >> 32; | |
101 | } | |
102 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
103 | } | |
104 | ||
9b7cf8b4 PM |
105 | static inline int get_sigset_t(sigset_t *set, |
106 | const compat_sigset_t __user *uset) | |
81e7009e SR |
107 | { |
108 | compat_sigset_t s32; | |
109 | ||
110 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
111 | return -EFAULT; | |
112 | ||
113 | /* | |
114 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
115 | * in the "wrong" endian in 32-bit user storage). | |
116 | */ | |
117 | switch (_NSIG_WORDS) { | |
118 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
119 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
120 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
121 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
127 | struct old_sigaction __user *act) | |
128 | { | |
129 | compat_old_sigset_t mask; | |
130 | compat_uptr_t handler, restorer; | |
131 | ||
132 | if (get_user(handler, &act->sa_handler) || | |
133 | __get_user(restorer, &act->sa_restorer) || | |
134 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
135 | __get_user(mask, &act->sa_mask)) | |
136 | return -EFAULT; | |
137 | new_ka->sa.sa_handler = compat_ptr(handler); | |
138 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
139 | siginitset(&new_ka->sa.sa_mask, mask); | |
140 | return 0; | |
141 | } | |
142 | ||
29e646df | 143 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
144 | #define from_user_ptr(p) compat_ptr(p) |
145 | ||
146 | static inline int save_general_regs(struct pt_regs *regs, | |
147 | struct mcontext __user *frame) | |
148 | { | |
149 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
150 | int i; | |
151 | ||
1bd79336 | 152 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
153 | |
154 | for (i = 0; i <= PT_RESULT; i ++) { | |
155 | if (i == 14 && !FULL_REGS(regs)) | |
156 | i = 32; | |
81e7009e SR |
157 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
158 | return -EFAULT; | |
401d1f02 | 159 | } |
81e7009e SR |
160 | return 0; |
161 | } | |
162 | ||
163 | static inline int restore_general_regs(struct pt_regs *regs, | |
164 | struct mcontext __user *sr) | |
165 | { | |
166 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
167 | int i; | |
168 | ||
169 | for (i = 0; i <= PT_RESULT; i++) { | |
170 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
171 | continue; | |
172 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
173 | return -EFAULT; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | #else /* CONFIG_PPC64 */ | |
179 | ||
81e7009e SR |
180 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
181 | ||
182 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
183 | { | |
184 | return copy_to_user(uset, set, sizeof(*uset)); | |
185 | } | |
186 | ||
9b7cf8b4 | 187 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
188 | { |
189 | return copy_from_user(set, uset, sizeof(*uset)); | |
190 | } | |
191 | ||
192 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
193 | struct old_sigaction __user *act) | |
194 | { | |
195 | old_sigset_t mask; | |
196 | ||
197 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
198 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
199 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
200 | return -EFAULT; | |
201 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
202 | __get_user(mask, &act->sa_mask); | |
203 | siginitset(&new_ka->sa.sa_mask, mask); | |
204 | return 0; | |
205 | } | |
206 | ||
29e646df AV |
207 | #define to_user_ptr(p) ((unsigned long)(p)) |
208 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
209 | |
210 | static inline int save_general_regs(struct pt_regs *regs, | |
211 | struct mcontext __user *frame) | |
212 | { | |
1bd79336 | 213 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
214 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
215 | } | |
216 | ||
217 | static inline int restore_general_regs(struct pt_regs *regs, | |
218 | struct mcontext __user *sr) | |
219 | { | |
220 | /* copy up to but not including MSR */ | |
221 | if (__copy_from_user(regs, &sr->mc_gregs, | |
222 | PT_MSR * sizeof(elf_greg_t))) | |
223 | return -EFAULT; | |
224 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
225 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
226 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
227 | return -EFAULT; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | #endif /* CONFIG_PPC64 */ | |
232 | ||
81e7009e SR |
233 | /* |
234 | * Atomically swap in the new signal mask, and wait for a signal. | |
235 | */ | |
150256d8 | 236 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 237 | { |
81e7009e SR |
238 | mask &= _BLOCKABLE; |
239 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 240 | current->saved_sigmask = current->blocked; |
81e7009e SR |
241 | siginitset(¤t->blocked, mask); |
242 | recalc_sigpending(); | |
243 | spin_unlock_irq(¤t->sighand->siglock); | |
244 | ||
150256d8 DW |
245 | current->state = TASK_INTERRUPTIBLE; |
246 | schedule(); | |
247 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
248 | return -ERESTARTNOHAND; | |
81e7009e SR |
249 | } |
250 | ||
81e7009e SR |
251 | long sys_sigaction(int sig, struct old_sigaction __user *act, |
252 | struct old_sigaction __user *oact) | |
253 | { | |
254 | struct k_sigaction new_ka, old_ka; | |
255 | int ret; | |
256 | ||
257 | #ifdef CONFIG_PPC64 | |
258 | if (sig < 0) | |
259 | sig = -sig; | |
260 | #endif | |
261 | ||
262 | if (act) { | |
263 | if (get_old_sigaction(&new_ka, act)) | |
264 | return -EFAULT; | |
265 | } | |
266 | ||
267 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
268 | if (!ret && oact) { | |
269 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
270 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
271 | &oact->sa_handler) || | |
272 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
273 | &oact->sa_restorer) || | |
274 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
275 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
276 | return -EFAULT; | |
277 | } | |
278 | ||
279 | return ret; | |
280 | } | |
1da177e4 LT |
281 | |
282 | /* | |
283 | * When we have signals to deliver, we set up on the | |
284 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
285 | * a sigregs struct |
286 | * a sigcontext struct | |
287 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
288 | * |
289 | * Each of these things must be a multiple of 16 bytes in size. | |
290 | * | |
291 | */ | |
81e7009e SR |
292 | struct sigregs { |
293 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
294 | /* |
295 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
296 | * regs and 18 fp regs below sp before decrementing it. | |
297 | */ | |
298 | int abigap[56]; | |
299 | }; | |
300 | ||
301 | /* We use the mc_pad field for the signal return trampoline. */ | |
302 | #define tramp mc_pad | |
303 | ||
304 | /* | |
305 | * When we have rt signals to deliver, we set up on the | |
306 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
307 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
308 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
309 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
310 | * positions as in older kernels). |
311 | * | |
312 | * Each of these things must be a multiple of 16 bytes in size. | |
313 | * | |
314 | */ | |
81e7009e SR |
315 | struct rt_sigframe { |
316 | #ifdef CONFIG_PPC64 | |
317 | compat_siginfo_t info; | |
318 | #else | |
319 | struct siginfo info; | |
320 | #endif | |
321 | struct ucontext uc; | |
1da177e4 LT |
322 | /* |
323 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
324 | * regs and 18 fp regs below sp before decrementing it. | |
325 | */ | |
326 | int abigap[56]; | |
327 | }; | |
328 | ||
1da177e4 LT |
329 | /* |
330 | * Save the current user registers on the user stack. | |
81e7009e SR |
331 | * We only save the altivec/spe registers if the process has used |
332 | * altivec/spe instructions at some point. | |
1da177e4 | 333 | */ |
81e7009e SR |
334 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
335 | int sigret) | |
1da177e4 | 336 | { |
1da177e4 LT |
337 | /* Make sure floating point registers are stored in regs */ |
338 | flush_fp_to_thread(current); | |
339 | ||
340 | /* save general and floating-point registers */ | |
81e7009e SR |
341 | if (save_general_regs(regs, frame) || |
342 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
343 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
344 | return 1; |
345 | ||
1da177e4 LT |
346 | #ifdef CONFIG_ALTIVEC |
347 | /* save altivec registers */ | |
348 | if (current->thread.used_vr) { | |
349 | flush_altivec_to_thread(current); | |
350 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 351 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
352 | return 1; |
353 | /* set MSR_VEC in the saved MSR value to indicate that | |
354 | frame->mc_vregs contains valid data */ | |
355 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
356 | return 1; | |
357 | } | |
358 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
359 | ||
360 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
361 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
362 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
363 | * most significant bits of that same vector. --BenH | |
364 | */ | |
365 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
366 | return 1; | |
367 | #endif /* CONFIG_ALTIVEC */ | |
368 | ||
81e7009e SR |
369 | #ifdef CONFIG_SPE |
370 | /* save spe registers */ | |
371 | if (current->thread.used_spe) { | |
372 | flush_spe_to_thread(current); | |
373 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
374 | ELF_NEVRREG * sizeof(u32))) | |
375 | return 1; | |
376 | /* set MSR_SPE in the saved MSR value to indicate that | |
377 | frame->mc_vregs contains valid data */ | |
378 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
379 | return 1; | |
380 | } | |
381 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
382 | ||
383 | /* We always copy to/from spefscr */ | |
384 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
385 | return 1; | |
386 | #endif /* CONFIG_SPE */ | |
387 | ||
1da177e4 LT |
388 | if (sigret) { |
389 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
390 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
391 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
392 | return 1; | |
393 | flush_icache_range((unsigned long) &frame->tramp[0], | |
394 | (unsigned long) &frame->tramp[2]); | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Restore the current user register values from the user stack, | |
402 | * (except for MSR). | |
403 | */ | |
404 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 405 | struct mcontext __user *sr, int sig) |
1da177e4 | 406 | { |
81e7009e | 407 | long err; |
1da177e4 | 408 | unsigned int save_r2 = 0; |
1da177e4 | 409 | unsigned long msr; |
1da177e4 LT |
410 | |
411 | /* | |
412 | * restore general registers but not including MSR or SOFTE. Also | |
413 | * take care of keeping r2 (TLS) intact if not a signal | |
414 | */ | |
415 | if (!sig) | |
416 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 417 | err = restore_general_regs(regs, sr); |
fab5db97 | 418 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
419 | if (!sig) |
420 | regs->gpr[2] = (unsigned long) save_r2; | |
421 | if (err) | |
422 | return 1; | |
423 | ||
fab5db97 PM |
424 | /* if doing signal return, restore the previous little-endian mode */ |
425 | if (sig) | |
426 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
427 | ||
5388fb10 PM |
428 | /* |
429 | * Do this before updating the thread state in | |
430 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
431 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
432 | * tempted to save the current CPU state into the thread_struct | |
433 | * and corrupt what we are writing there. | |
434 | */ | |
435 | discard_lazy_cpu_state(); | |
436 | ||
1da177e4 LT |
437 | /* force the process to reload the FP registers from |
438 | current->thread when it next does FP instructions */ | |
439 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
440 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
441 | sizeof(sr->mc_fregs))) | |
442 | return 1; | |
443 | ||
444 | #ifdef CONFIG_ALTIVEC | |
445 | /* force the process to reload the altivec registers from | |
446 | current->thread when it next does altivec instructions */ | |
447 | regs->msr &= ~MSR_VEC; | |
fab5db97 | 448 | if (msr & MSR_VEC) { |
1da177e4 LT |
449 | /* restore altivec registers from the stack */ |
450 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
451 | sizeof(sr->mc_vregs))) | |
452 | return 1; | |
453 | } else if (current->thread.used_vr) | |
81e7009e | 454 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
455 | |
456 | /* Always get VRSAVE back */ | |
457 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
458 | return 1; | |
459 | #endif /* CONFIG_ALTIVEC */ | |
460 | ||
81e7009e SR |
461 | #ifdef CONFIG_SPE |
462 | /* force the process to reload the spe registers from | |
463 | current->thread when it next does spe instructions */ | |
464 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 465 | if (msr & MSR_SPE) { |
81e7009e SR |
466 | /* restore spe registers from the stack */ |
467 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
468 | ELF_NEVRREG * sizeof(u32))) | |
469 | return 1; | |
470 | } else if (current->thread.used_spe) | |
471 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
472 | ||
473 | /* Always get SPEFSCR back */ | |
474 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
475 | return 1; | |
476 | #endif /* CONFIG_SPE */ | |
477 | ||
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | ||
81e7009e | 481 | #ifdef CONFIG_PPC64 |
b09a4913 | 482 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
483 | struct sigaction32 __user *oact, size_t sigsetsize) |
484 | { | |
485 | struct k_sigaction new_ka, old_ka; | |
486 | int ret; | |
1da177e4 LT |
487 | |
488 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
489 | if (sigsetsize != sizeof(compat_sigset_t)) | |
490 | return -EINVAL; | |
491 | ||
492 | if (act) { | |
493 | compat_uptr_t handler; | |
494 | ||
495 | ret = get_user(handler, &act->sa_handler); | |
496 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 497 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
498 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
499 | if (ret) | |
500 | return -EFAULT; | |
501 | } | |
502 | ||
503 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
504 | if (!ret && oact) { | |
29e646df | 505 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 506 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
507 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
508 | } | |
509 | return ret; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Note: it is necessary to treat how as an unsigned int, with the | |
514 | * corresponding cast to a signed int to insure that the proper | |
515 | * conversion (sign extension) between the register representation | |
516 | * of a signed int (msr in 32-bit mode) and the register representation | |
517 | * of a signed int (msr in 64-bit mode) is performed. | |
518 | */ | |
b09a4913 | 519 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
520 | compat_sigset_t __user *oset, size_t sigsetsize) |
521 | { | |
522 | sigset_t s; | |
523 | sigset_t __user *up; | |
1da177e4 LT |
524 | int ret; |
525 | mm_segment_t old_fs = get_fs(); | |
526 | ||
527 | if (set) { | |
81e7009e SR |
528 | if (get_sigset_t(&s, set)) |
529 | return -EFAULT; | |
1da177e4 | 530 | } |
81e7009e | 531 | |
1da177e4 LT |
532 | set_fs(KERNEL_DS); |
533 | /* This is valid because of the set_fs() */ | |
534 | up = (sigset_t __user *) &s; | |
535 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 536 | sigsetsize); |
1da177e4 LT |
537 | set_fs(old_fs); |
538 | if (ret) | |
539 | return ret; | |
540 | if (oset) { | |
81e7009e | 541 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
542 | return -EFAULT; |
543 | } | |
544 | return 0; | |
545 | } | |
546 | ||
b09a4913 | 547 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
548 | { |
549 | sigset_t s; | |
1da177e4 LT |
550 | int ret; |
551 | mm_segment_t old_fs = get_fs(); | |
552 | ||
553 | set_fs(KERNEL_DS); | |
554 | /* The __user pointer cast is valid because of the set_fs() */ | |
555 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
556 | set_fs(old_fs); | |
557 | if (!ret) { | |
81e7009e | 558 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
559 | return -EFAULT; |
560 | } | |
561 | return ret; | |
562 | } | |
563 | ||
564 | ||
565 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
566 | { | |
567 | int err; | |
568 | ||
569 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
570 | return -EFAULT; | |
571 | ||
572 | /* If you change siginfo_t structure, please be sure | |
573 | * this code is fixed accordingly. | |
574 | * It should never copy any pad contained in the structure | |
575 | * to avoid security leaks, but must copy the generic | |
576 | * 3 ints plus the relevant union member. | |
577 | * This routine must convert siginfo from 64bit to 32bit as well | |
578 | * at the same time. | |
579 | */ | |
580 | err = __put_user(s->si_signo, &d->si_signo); | |
581 | err |= __put_user(s->si_errno, &d->si_errno); | |
582 | err |= __put_user((short)s->si_code, &d->si_code); | |
583 | if (s->si_code < 0) | |
584 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
585 | SI_PAD_SIZE32); | |
586 | else switch(s->si_code >> 16) { | |
587 | case __SI_CHLD >> 16: | |
588 | err |= __put_user(s->si_pid, &d->si_pid); | |
589 | err |= __put_user(s->si_uid, &d->si_uid); | |
590 | err |= __put_user(s->si_utime, &d->si_utime); | |
591 | err |= __put_user(s->si_stime, &d->si_stime); | |
592 | err |= __put_user(s->si_status, &d->si_status); | |
593 | break; | |
594 | case __SI_FAULT >> 16: | |
595 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
596 | &d->si_addr); | |
597 | break; | |
598 | case __SI_POLL >> 16: | |
599 | err |= __put_user(s->si_band, &d->si_band); | |
600 | err |= __put_user(s->si_fd, &d->si_fd); | |
601 | break; | |
602 | case __SI_TIMER >> 16: | |
603 | err |= __put_user(s->si_tid, &d->si_tid); | |
604 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
605 | err |= __put_user(s->si_int, &d->si_int); | |
606 | break; | |
607 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
608 | case __SI_MESGQ >> 16: | |
609 | err |= __put_user(s->si_int, &d->si_int); | |
610 | /* fallthrough */ | |
611 | case __SI_KILL >> 16: | |
612 | default: | |
613 | err |= __put_user(s->si_pid, &d->si_pid); | |
614 | err |= __put_user(s->si_uid, &d->si_uid); | |
615 | break; | |
616 | } | |
617 | return err; | |
618 | } | |
619 | ||
81e7009e SR |
620 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
621 | ||
1da177e4 LT |
622 | /* |
623 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
624 | * corresponding cast to a signed int to insure that the proper conversion | |
625 | * (sign extension) between the register representation of a signed int | |
626 | * (msr in 32-bit mode) and the register representation of a signed int | |
627 | * (msr in 64-bit mode) is performed. | |
628 | */ | |
b09a4913 | 629 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
630 | { |
631 | siginfo_t info; | |
632 | int ret; | |
633 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 634 | |
1da177e4 LT |
635 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
636 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
637 | return -EFAULT; | |
638 | set_fs (KERNEL_DS); | |
639 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
640 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
641 | set_fs (old_fs); | |
642 | return ret; | |
643 | } | |
1da177e4 LT |
644 | /* |
645 | * Start Alternate signal stack support | |
646 | * | |
647 | * System Calls | |
b09a4913 | 648 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
649 | */ |
650 | ||
b09a4913 | 651 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
652 | int r6, int r7, int r8, struct pt_regs *regs) |
653 | { | |
29e646df AV |
654 | stack_32_t __user * newstack = compat_ptr(__new); |
655 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
656 | stack_t uss, uoss; |
657 | int ret; | |
658 | mm_segment_t old_fs; | |
659 | unsigned long sp; | |
660 | compat_uptr_t ss_sp; | |
661 | ||
662 | /* | |
663 | * set sp to the user stack on entry to the system call | |
664 | * the system call router sets R9 to the saved registers | |
665 | */ | |
666 | sp = regs->gpr[1]; | |
667 | ||
668 | /* Put new stack info in local 64 bit stack struct */ | |
669 | if (newstack) { | |
670 | if (get_user(ss_sp, &newstack->ss_sp) || | |
671 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
672 | __get_user(uss.ss_size, &newstack->ss_size)) | |
673 | return -EFAULT; | |
674 | uss.ss_sp = compat_ptr(ss_sp); | |
675 | } | |
676 | ||
677 | old_fs = get_fs(); | |
678 | set_fs(KERNEL_DS); | |
679 | /* The __user pointer casts are valid because of the set_fs() */ | |
680 | ret = do_sigaltstack( | |
681 | newstack ? (stack_t __user *) &uss : NULL, | |
682 | oldstack ? (stack_t __user *) &uoss : NULL, | |
683 | sp); | |
684 | set_fs(old_fs); | |
685 | /* Copy the stack information to the user output buffer */ | |
686 | if (!ret && oldstack && | |
29e646df | 687 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
688 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
689 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
690 | return -EFAULT; | |
691 | return ret; | |
692 | } | |
81e7009e | 693 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 694 | |
1da177e4 LT |
695 | /* |
696 | * Set up a signal frame for a "real-time" signal handler | |
697 | * (one which gets siginfo). | |
698 | */ | |
f478f543 | 699 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e SR |
700 | siginfo_t *info, sigset_t *oldset, |
701 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 702 | { |
81e7009e SR |
703 | struct rt_sigframe __user *rt_sf; |
704 | struct mcontext __user *frame; | |
1da177e4 | 705 | unsigned long origsp = newsp; |
1da177e4 LT |
706 | |
707 | /* Set up Signal Frame */ | |
708 | /* Put a Real Time Context onto stack */ | |
709 | newsp -= sizeof(*rt_sf); | |
81e7009e | 710 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
711 | |
712 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 713 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
714 | |
715 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
716 | goto badframe; | |
717 | ||
1da177e4 | 718 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 719 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
720 | || __put_user(0, &rt_sf->uc.uc_flags) |
721 | || __put_user(0, &rt_sf->uc.uc_link) | |
722 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
723 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
724 | &rt_sf->uc.uc_stack.ss_flags) | |
725 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
726 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
727 | &rt_sf->uc.uc_regs) | |
728 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
729 | goto badframe; |
730 | ||
731 | /* Save user registers on the stack */ | |
732 | frame = &rt_sf->uc.uc_mcontext; | |
a5bba930 | 733 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
734 | if (save_user_regs(regs, frame, 0)) |
735 | goto badframe; | |
a5bba930 | 736 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 737 | } else { |
1da177e4 LT |
738 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
739 | goto badframe; | |
740 | regs->link = (unsigned long) frame->tramp; | |
741 | } | |
cc657f53 PM |
742 | |
743 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
744 | ||
e2b55306 | 745 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
746 | goto badframe; |
747 | regs->gpr[1] = newsp; | |
1da177e4 LT |
748 | regs->gpr[3] = sig; |
749 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
750 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
751 | regs->gpr[6] = (unsigned long) rt_sf; | |
752 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
753 | /* enter the signal handler in big-endian mode */ |
754 | regs->msr &= ~MSR_LE; | |
1da177e4 | 755 | regs->trap = 0; |
1da177e4 LT |
756 | return 1; |
757 | ||
758 | badframe: | |
81e7009e | 759 | #ifdef DEBUG_SIG |
1da177e4 LT |
760 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
761 | regs, frame, newsp); | |
762 | #endif | |
763 | force_sigsegv(sig, current); | |
764 | return 0; | |
765 | } | |
766 | ||
81e7009e | 767 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 768 | { |
1da177e4 | 769 | sigset_t set; |
81e7009e SR |
770 | struct mcontext __user *mcp; |
771 | ||
772 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
773 | return -EFAULT; | |
774 | #ifdef CONFIG_PPC64 | |
775 | { | |
776 | u32 cmcp; | |
1da177e4 | 777 | |
81e7009e SR |
778 | if (__get_user(cmcp, &ucp->uc_regs)) |
779 | return -EFAULT; | |
780 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 781 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
782 | } |
783 | #else | |
784 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 785 | return -EFAULT; |
7c85d1f9 PM |
786 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
787 | return -EFAULT; | |
81e7009e | 788 | #endif |
1da177e4 | 789 | restore_sigmask(&set); |
81e7009e | 790 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
791 | return -EFAULT; |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
81e7009e | 796 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
797 | struct ucontext __user *new_ctx, |
798 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
799 | { |
800 | unsigned char tmp; | |
1da177e4 LT |
801 | |
802 | /* Context size is for future use. Right now, we only make sure | |
803 | * we are passed something we understand | |
804 | */ | |
81e7009e | 805 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
806 | return -EINVAL; |
807 | ||
808 | if (old_ctx != NULL) { | |
1c9bb1a0 PM |
809 | struct mcontext __user *mctx; |
810 | ||
811 | /* | |
812 | * old_ctx might not be 16-byte aligned, in which | |
813 | * case old_ctx->uc_mcontext won't be either. | |
814 | * Because we have the old_ctx->uc_pad2 field | |
815 | * before old_ctx->uc_mcontext, we need to round down | |
816 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
817 | */ | |
818 | mctx = (struct mcontext __user *) | |
819 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
1da177e4 | 820 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
1c9bb1a0 | 821 | || save_user_regs(regs, mctx, 0) |
81e7009e | 822 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 823 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
824 | return -EFAULT; |
825 | } | |
826 | if (new_ctx == NULL) | |
827 | return 0; | |
828 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
829 | || __get_user(tmp, (u8 __user *) new_ctx) | |
830 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
831 | return -EFAULT; | |
832 | ||
833 | /* | |
834 | * If we get a fault copying the context into the kernel's | |
835 | * image of the user's registers, we can't just return -EFAULT | |
836 | * because the user's registers will be corrupted. For instance | |
837 | * the NIP value may have been updated but not some of the | |
838 | * other registers. Given that we have done the access_ok | |
839 | * and successfully read the first and last bytes of the region | |
840 | * above, this should only happen in an out-of-memory situation | |
841 | * or if another thread unmaps the region containing the context. | |
842 | * We kill the task with a SIGSEGV in this situation. | |
843 | */ | |
81e7009e | 844 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 845 | do_exit(SIGSEGV); |
401d1f02 DW |
846 | |
847 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
848 | return 0; |
849 | } | |
850 | ||
81e7009e | 851 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
852 | struct pt_regs *regs) |
853 | { | |
81e7009e | 854 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
855 | |
856 | /* Always make any pending restarted system calls return -EINTR */ | |
857 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
858 | ||
81e7009e SR |
859 | rt_sf = (struct rt_sigframe __user *) |
860 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
861 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
862 | goto bad; | |
81e7009e | 863 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
864 | goto bad; |
865 | ||
866 | /* | |
867 | * It's not clear whether or why it is desirable to save the | |
868 | * sigaltstack setting on signal delivery and restore it on | |
869 | * signal return. But other architectures do this and we have | |
870 | * always done it up until now so it is probably better not to | |
871 | * change it. -- paulus | |
81e7009e SR |
872 | */ |
873 | #ifdef CONFIG_PPC64 | |
874 | /* | |
b09a4913 | 875 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
876 | * and takes userland pointer directly. What about error checking ? |
877 | * nobody does any... | |
878 | */ | |
b09a4913 | 879 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
880 | #else |
881 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 882 | #endif |
401d1f02 DW |
883 | set_thread_flag(TIF_RESTOREALL); |
884 | return 0; | |
1da177e4 LT |
885 | |
886 | bad: | |
887 | force_sig(SIGSEGV, current); | |
888 | return 0; | |
889 | } | |
890 | ||
81e7009e SR |
891 | #ifdef CONFIG_PPC32 |
892 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
893 | int ndbg, struct sig_dbg_op __user *dbg, | |
894 | int r6, int r7, int r8, | |
895 | struct pt_regs *regs) | |
896 | { | |
897 | struct sig_dbg_op op; | |
898 | int i; | |
7c85d1f9 | 899 | unsigned char tmp; |
81e7009e SR |
900 | unsigned long new_msr = regs->msr; |
901 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
902 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
903 | #endif | |
904 | ||
905 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 906 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
907 | return -EFAULT; |
908 | switch (op.dbg_type) { | |
909 | case SIG_DBG_SINGLE_STEPPING: | |
910 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
911 | if (op.dbg_value) { | |
912 | new_msr |= MSR_DE; | |
913 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
914 | } else { | |
915 | new_msr &= ~MSR_DE; | |
916 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
917 | } | |
918 | #else | |
919 | if (op.dbg_value) | |
920 | new_msr |= MSR_SE; | |
921 | else | |
922 | new_msr &= ~MSR_SE; | |
923 | #endif | |
924 | break; | |
925 | case SIG_DBG_BRANCH_TRACING: | |
926 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
927 | return -EINVAL; | |
928 | #else | |
929 | if (op.dbg_value) | |
930 | new_msr |= MSR_BE; | |
931 | else | |
932 | new_msr &= ~MSR_BE; | |
933 | #endif | |
934 | break; | |
935 | ||
936 | default: | |
937 | return -EINVAL; | |
938 | } | |
939 | } | |
940 | ||
941 | /* We wait until here to actually install the values in the | |
942 | registers so if we fail in the above loop, it will not | |
943 | affect the contents of these registers. After this point, | |
944 | failure is a problem, anyway, and it's very unlikely unless | |
945 | the user is really doing something wrong. */ | |
946 | regs->msr = new_msr; | |
947 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
948 | current->thread.dbcr0 = new_dbcr0; | |
949 | #endif | |
950 | ||
7c85d1f9 PM |
951 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
952 | || __get_user(tmp, (u8 __user *) ctx) | |
953 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
954 | return -EFAULT; | |
955 | ||
81e7009e SR |
956 | /* |
957 | * If we get a fault copying the context into the kernel's | |
958 | * image of the user's registers, we can't just return -EFAULT | |
959 | * because the user's registers will be corrupted. For instance | |
960 | * the NIP value may have been updated but not some of the | |
961 | * other registers. Given that we have done the access_ok | |
962 | * and successfully read the first and last bytes of the region | |
963 | * above, this should only happen in an out-of-memory situation | |
964 | * or if another thread unmaps the region containing the context. | |
965 | * We kill the task with a SIGSEGV in this situation. | |
966 | */ | |
967 | if (do_setcontext(ctx, regs, 1)) { | |
968 | force_sig(SIGSEGV, current); | |
969 | goto out; | |
970 | } | |
971 | ||
972 | /* | |
973 | * It's not clear whether or why it is desirable to save the | |
974 | * sigaltstack setting on signal delivery and restore it on | |
975 | * signal return. But other architectures do this and we have | |
976 | * always done it up until now so it is probably better not to | |
977 | * change it. -- paulus | |
978 | */ | |
979 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
980 | ||
401d1f02 | 981 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
982 | out: |
983 | return 0; | |
984 | } | |
985 | #endif | |
1da177e4 LT |
986 | |
987 | /* | |
988 | * OK, we're invoking a handler | |
989 | */ | |
f478f543 | 990 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e SR |
991 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, |
992 | unsigned long newsp) | |
1da177e4 | 993 | { |
81e7009e SR |
994 | struct sigcontext __user *sc; |
995 | struct sigregs __user *frame; | |
1da177e4 LT |
996 | unsigned long origsp = newsp; |
997 | ||
998 | /* Set up Signal Frame */ | |
81e7009e SR |
999 | newsp -= sizeof(struct sigregs); |
1000 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1001 | |
1002 | /* Put a sigcontext on the stack */ | |
1003 | newsp -= sizeof(*sc); | |
81e7009e | 1004 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1005 | |
1006 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1007 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1008 | |
1009 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1010 | goto badframe; | |
1011 | ||
1012 | #if _NSIG != 64 | |
81e7009e | 1013 | #error "Please adjust handle_signal()" |
1da177e4 | 1014 | #endif |
81e7009e | 1015 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1016 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1017 | #ifdef CONFIG_PPC64 |
1da177e4 | 1018 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1019 | #else |
1020 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1021 | #endif | |
1022 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1023 | || __put_user(sig, &sc->signal)) |
1024 | goto badframe; | |
1025 | ||
a5bba930 | 1026 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
1027 | if (save_user_regs(regs, &frame->mctx, 0)) |
1028 | goto badframe; | |
a5bba930 | 1029 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1030 | } else { |
1da177e4 LT |
1031 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1032 | goto badframe; | |
1033 | regs->link = (unsigned long) frame->mctx.tramp; | |
1034 | } | |
1035 | ||
cc657f53 PM |
1036 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1037 | ||
9747dd6f | 1038 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1039 | goto badframe; |
81e7009e | 1040 | regs->gpr[1] = newsp; |
1da177e4 LT |
1041 | regs->gpr[3] = sig; |
1042 | regs->gpr[4] = (unsigned long) sc; | |
1043 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1044 | /* enter the signal handler in big-endian mode */ |
1045 | regs->msr &= ~MSR_LE; | |
1da177e4 | 1046 | regs->trap = 0; |
1da177e4 LT |
1047 | |
1048 | return 1; | |
1049 | ||
1050 | badframe: | |
81e7009e SR |
1051 | #ifdef DEBUG_SIG |
1052 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1053 | regs, frame, newsp); | |
1da177e4 LT |
1054 | #endif |
1055 | force_sigsegv(sig, current); | |
1056 | return 0; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Do a signal return; undo the signal stack. | |
1061 | */ | |
81e7009e | 1062 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1063 | struct pt_regs *regs) |
1064 | { | |
81e7009e SR |
1065 | struct sigcontext __user *sc; |
1066 | struct sigcontext sigctx; | |
1067 | struct mcontext __user *sr; | |
1da177e4 | 1068 | sigset_t set; |
1da177e4 LT |
1069 | |
1070 | /* Always make any pending restarted system calls return -EINTR */ | |
1071 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1072 | ||
81e7009e | 1073 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1074 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1075 | goto badframe; | |
1076 | ||
81e7009e | 1077 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1078 | /* |
1079 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1080 | * unused part of the signal stackframe | |
1081 | */ | |
1082 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1083 | #else |
1084 | set.sig[0] = sigctx.oldmask; | |
1085 | set.sig[1] = sigctx._unused[3]; | |
1086 | #endif | |
1da177e4 LT |
1087 | restore_sigmask(&set); |
1088 | ||
81e7009e | 1089 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
1da177e4 LT |
1090 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1091 | || restore_user_regs(regs, sr, 1)) | |
1092 | goto badframe; | |
1093 | ||
401d1f02 | 1094 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1095 | return 0; |
1da177e4 LT |
1096 | |
1097 | badframe: | |
1098 | force_sig(SIGSEGV, current); | |
1099 | return 0; | |
1100 | } |