Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
81e7009e | 2 | * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC |
1da177e4 | 3 | * |
81e7009e SR |
4 | * PowerPC version |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
1da177e4 LT |
6 | * Copyright (C) 2001 IBM |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) | |
9 | * | |
81e7009e SR |
10 | * Derived from "arch/i386/kernel/signal.c" |
11 | * Copyright (C) 1991, 1992 Linus Torvalds | |
12 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
1da177e4 | 13 | * |
81e7009e SR |
14 | * This program is free software; you can redistribute it and/or |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/sched.h> |
81e7009e | 21 | #include <linux/mm.h> |
1da177e4 | 22 | #include <linux/smp.h> |
1da177e4 LT |
23 | #include <linux/kernel.h> |
24 | #include <linux/signal.h> | |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/elf.h> | |
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: | |
a3f61dc0 BH |
285 | * an ABI gap of 56 words |
286 | * an mcontext struct | |
81e7009e SR |
287 | * a sigcontext struct |
288 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 | 289 | * |
a3f61dc0 BH |
290 | * Each of these things must be a multiple of 16 bytes in size. The following |
291 | * structure represent all of this except the __SIGNAL_FRAMESIZE gap | |
1da177e4 LT |
292 | * |
293 | */ | |
a3f61dc0 BH |
294 | struct sigframe { |
295 | struct sigcontext sctx; /* the sigcontext */ | |
81e7009e | 296 | struct mcontext mctx; /* all the register values */ |
1da177e4 LT |
297 | /* |
298 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
299 | * regs and 18 fp regs below sp before decrementing it. | |
300 | */ | |
301 | int abigap[56]; | |
302 | }; | |
303 | ||
304 | /* We use the mc_pad field for the signal return trampoline. */ | |
305 | #define tramp mc_pad | |
306 | ||
307 | /* | |
308 | * When we have rt signals to deliver, we set up on the | |
309 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
310 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
311 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
312 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
313 | * positions as in older kernels). |
314 | * | |
315 | * Each of these things must be a multiple of 16 bytes in size. | |
316 | * | |
317 | */ | |
81e7009e SR |
318 | struct rt_sigframe { |
319 | #ifdef CONFIG_PPC64 | |
320 | compat_siginfo_t info; | |
321 | #else | |
322 | struct siginfo info; | |
323 | #endif | |
324 | struct ucontext uc; | |
1da177e4 LT |
325 | /* |
326 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
327 | * regs and 18 fp regs below sp before decrementing it. | |
328 | */ | |
329 | int abigap[56]; | |
330 | }; | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * Save the current user registers on the user stack. | |
81e7009e SR |
334 | * We only save the altivec/spe registers if the process has used |
335 | * altivec/spe instructions at some point. | |
1da177e4 | 336 | */ |
81e7009e SR |
337 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
338 | int sigret) | |
1da177e4 | 339 | { |
1da177e4 LT |
340 | /* Make sure floating point registers are stored in regs */ |
341 | flush_fp_to_thread(current); | |
342 | ||
343 | /* save general and floating-point registers */ | |
81e7009e SR |
344 | if (save_general_regs(regs, frame) || |
345 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
346 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
347 | return 1; |
348 | ||
1da177e4 LT |
349 | #ifdef CONFIG_ALTIVEC |
350 | /* save altivec registers */ | |
351 | if (current->thread.used_vr) { | |
352 | flush_altivec_to_thread(current); | |
353 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 354 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
355 | return 1; |
356 | /* set MSR_VEC in the saved MSR value to indicate that | |
357 | frame->mc_vregs contains valid data */ | |
358 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
359 | return 1; | |
360 | } | |
361 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
362 | ||
363 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
364 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
365 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
366 | * most significant bits of that same vector. --BenH | |
367 | */ | |
368 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
369 | return 1; | |
370 | #endif /* CONFIG_ALTIVEC */ | |
371 | ||
81e7009e SR |
372 | #ifdef CONFIG_SPE |
373 | /* save spe registers */ | |
374 | if (current->thread.used_spe) { | |
375 | flush_spe_to_thread(current); | |
376 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
377 | ELF_NEVRREG * sizeof(u32))) | |
378 | return 1; | |
379 | /* set MSR_SPE in the saved MSR value to indicate that | |
380 | frame->mc_vregs contains valid data */ | |
381 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
382 | return 1; | |
383 | } | |
384 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
385 | ||
386 | /* We always copy to/from spefscr */ | |
387 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
388 | return 1; | |
389 | #endif /* CONFIG_SPE */ | |
390 | ||
1da177e4 LT |
391 | if (sigret) { |
392 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
393 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
394 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
395 | return 1; | |
396 | flush_icache_range((unsigned long) &frame->tramp[0], | |
397 | (unsigned long) &frame->tramp[2]); | |
398 | } | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Restore the current user register values from the user stack, | |
405 | * (except for MSR). | |
406 | */ | |
407 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 408 | struct mcontext __user *sr, int sig) |
1da177e4 | 409 | { |
81e7009e | 410 | long err; |
1da177e4 | 411 | unsigned int save_r2 = 0; |
1da177e4 | 412 | unsigned long msr; |
1da177e4 LT |
413 | |
414 | /* | |
415 | * restore general registers but not including MSR or SOFTE. Also | |
416 | * take care of keeping r2 (TLS) intact if not a signal | |
417 | */ | |
418 | if (!sig) | |
419 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 420 | err = restore_general_regs(regs, sr); |
fab5db97 | 421 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
422 | if (!sig) |
423 | regs->gpr[2] = (unsigned long) save_r2; | |
424 | if (err) | |
425 | return 1; | |
426 | ||
fab5db97 PM |
427 | /* if doing signal return, restore the previous little-endian mode */ |
428 | if (sig) | |
429 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
430 | ||
5388fb10 PM |
431 | /* |
432 | * Do this before updating the thread state in | |
433 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
434 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
435 | * tempted to save the current CPU state into the thread_struct | |
436 | * and corrupt what we are writing there. | |
437 | */ | |
438 | discard_lazy_cpu_state(); | |
439 | ||
1da177e4 LT |
440 | /* force the process to reload the FP registers from |
441 | current->thread when it next does FP instructions */ | |
442 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
443 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
444 | sizeof(sr->mc_fregs))) | |
445 | return 1; | |
446 | ||
447 | #ifdef CONFIG_ALTIVEC | |
448 | /* force the process to reload the altivec registers from | |
449 | current->thread when it next does altivec instructions */ | |
450 | regs->msr &= ~MSR_VEC; | |
fab5db97 | 451 | if (msr & MSR_VEC) { |
1da177e4 LT |
452 | /* restore altivec registers from the stack */ |
453 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
454 | sizeof(sr->mc_vregs))) | |
455 | return 1; | |
456 | } else if (current->thread.used_vr) | |
81e7009e | 457 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
458 | |
459 | /* Always get VRSAVE back */ | |
460 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
461 | return 1; | |
462 | #endif /* CONFIG_ALTIVEC */ | |
463 | ||
81e7009e SR |
464 | #ifdef CONFIG_SPE |
465 | /* force the process to reload the spe registers from | |
466 | current->thread when it next does spe instructions */ | |
467 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 468 | if (msr & MSR_SPE) { |
81e7009e SR |
469 | /* restore spe registers from the stack */ |
470 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
471 | ELF_NEVRREG * sizeof(u32))) | |
472 | return 1; | |
473 | } else if (current->thread.used_spe) | |
474 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
475 | ||
476 | /* Always get SPEFSCR back */ | |
477 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
478 | return 1; | |
479 | #endif /* CONFIG_SPE */ | |
480 | ||
1da177e4 LT |
481 | return 0; |
482 | } | |
483 | ||
81e7009e | 484 | #ifdef CONFIG_PPC64 |
b09a4913 | 485 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
486 | struct sigaction32 __user *oact, size_t sigsetsize) |
487 | { | |
488 | struct k_sigaction new_ka, old_ka; | |
489 | int ret; | |
1da177e4 LT |
490 | |
491 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
492 | if (sigsetsize != sizeof(compat_sigset_t)) | |
493 | return -EINVAL; | |
494 | ||
495 | if (act) { | |
496 | compat_uptr_t handler; | |
497 | ||
498 | ret = get_user(handler, &act->sa_handler); | |
499 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 500 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
501 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
502 | if (ret) | |
503 | return -EFAULT; | |
504 | } | |
505 | ||
506 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
507 | if (!ret && oact) { | |
29e646df | 508 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 509 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
510 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
511 | } | |
512 | return ret; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Note: it is necessary to treat how as an unsigned int, with the | |
517 | * corresponding cast to a signed int to insure that the proper | |
518 | * conversion (sign extension) between the register representation | |
519 | * of a signed int (msr in 32-bit mode) and the register representation | |
520 | * of a signed int (msr in 64-bit mode) is performed. | |
521 | */ | |
b09a4913 | 522 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
523 | compat_sigset_t __user *oset, size_t sigsetsize) |
524 | { | |
525 | sigset_t s; | |
526 | sigset_t __user *up; | |
1da177e4 LT |
527 | int ret; |
528 | mm_segment_t old_fs = get_fs(); | |
529 | ||
530 | if (set) { | |
81e7009e SR |
531 | if (get_sigset_t(&s, set)) |
532 | return -EFAULT; | |
1da177e4 | 533 | } |
81e7009e | 534 | |
1da177e4 LT |
535 | set_fs(KERNEL_DS); |
536 | /* This is valid because of the set_fs() */ | |
537 | up = (sigset_t __user *) &s; | |
538 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 539 | sigsetsize); |
1da177e4 LT |
540 | set_fs(old_fs); |
541 | if (ret) | |
542 | return ret; | |
543 | if (oset) { | |
81e7009e | 544 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
545 | return -EFAULT; |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
b09a4913 | 550 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
551 | { |
552 | sigset_t s; | |
1da177e4 LT |
553 | int ret; |
554 | mm_segment_t old_fs = get_fs(); | |
555 | ||
556 | set_fs(KERNEL_DS); | |
557 | /* The __user pointer cast is valid because of the set_fs() */ | |
558 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
559 | set_fs(old_fs); | |
560 | if (!ret) { | |
81e7009e | 561 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
562 | return -EFAULT; |
563 | } | |
564 | return ret; | |
565 | } | |
566 | ||
567 | ||
568 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
569 | { | |
570 | int err; | |
571 | ||
572 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
573 | return -EFAULT; | |
574 | ||
575 | /* If you change siginfo_t structure, please be sure | |
576 | * this code is fixed accordingly. | |
577 | * It should never copy any pad contained in the structure | |
578 | * to avoid security leaks, but must copy the generic | |
579 | * 3 ints plus the relevant union member. | |
580 | * This routine must convert siginfo from 64bit to 32bit as well | |
581 | * at the same time. | |
582 | */ | |
583 | err = __put_user(s->si_signo, &d->si_signo); | |
584 | err |= __put_user(s->si_errno, &d->si_errno); | |
585 | err |= __put_user((short)s->si_code, &d->si_code); | |
586 | if (s->si_code < 0) | |
587 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
588 | SI_PAD_SIZE32); | |
589 | else switch(s->si_code >> 16) { | |
590 | case __SI_CHLD >> 16: | |
591 | err |= __put_user(s->si_pid, &d->si_pid); | |
592 | err |= __put_user(s->si_uid, &d->si_uid); | |
593 | err |= __put_user(s->si_utime, &d->si_utime); | |
594 | err |= __put_user(s->si_stime, &d->si_stime); | |
595 | err |= __put_user(s->si_status, &d->si_status); | |
596 | break; | |
597 | case __SI_FAULT >> 16: | |
598 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
599 | &d->si_addr); | |
600 | break; | |
601 | case __SI_POLL >> 16: | |
602 | err |= __put_user(s->si_band, &d->si_band); | |
603 | err |= __put_user(s->si_fd, &d->si_fd); | |
604 | break; | |
605 | case __SI_TIMER >> 16: | |
606 | err |= __put_user(s->si_tid, &d->si_tid); | |
607 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
608 | err |= __put_user(s->si_int, &d->si_int); | |
609 | break; | |
610 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
611 | case __SI_MESGQ >> 16: | |
612 | err |= __put_user(s->si_int, &d->si_int); | |
613 | /* fallthrough */ | |
614 | case __SI_KILL >> 16: | |
615 | default: | |
616 | err |= __put_user(s->si_pid, &d->si_pid); | |
617 | err |= __put_user(s->si_uid, &d->si_uid); | |
618 | break; | |
619 | } | |
620 | return err; | |
621 | } | |
622 | ||
81e7009e SR |
623 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
624 | ||
1da177e4 LT |
625 | /* |
626 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
627 | * corresponding cast to a signed int to insure that the proper conversion | |
628 | * (sign extension) between the register representation of a signed int | |
629 | * (msr in 32-bit mode) and the register representation of a signed int | |
630 | * (msr in 64-bit mode) is performed. | |
631 | */ | |
b09a4913 | 632 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
633 | { |
634 | siginfo_t info; | |
635 | int ret; | |
636 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 637 | |
1da177e4 LT |
638 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
639 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
640 | return -EFAULT; | |
641 | set_fs (KERNEL_DS); | |
642 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
643 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
644 | set_fs (old_fs); | |
645 | return ret; | |
646 | } | |
1da177e4 LT |
647 | /* |
648 | * Start Alternate signal stack support | |
649 | * | |
650 | * System Calls | |
b09a4913 | 651 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
652 | */ |
653 | ||
b09a4913 | 654 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
655 | int r6, int r7, int r8, struct pt_regs *regs) |
656 | { | |
29e646df AV |
657 | stack_32_t __user * newstack = compat_ptr(__new); |
658 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
659 | stack_t uss, uoss; |
660 | int ret; | |
661 | mm_segment_t old_fs; | |
662 | unsigned long sp; | |
663 | compat_uptr_t ss_sp; | |
664 | ||
665 | /* | |
666 | * set sp to the user stack on entry to the system call | |
667 | * the system call router sets R9 to the saved registers | |
668 | */ | |
669 | sp = regs->gpr[1]; | |
670 | ||
671 | /* Put new stack info in local 64 bit stack struct */ | |
672 | if (newstack) { | |
673 | if (get_user(ss_sp, &newstack->ss_sp) || | |
674 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
675 | __get_user(uss.ss_size, &newstack->ss_size)) | |
676 | return -EFAULT; | |
677 | uss.ss_sp = compat_ptr(ss_sp); | |
678 | } | |
679 | ||
680 | old_fs = get_fs(); | |
681 | set_fs(KERNEL_DS); | |
682 | /* The __user pointer casts are valid because of the set_fs() */ | |
683 | ret = do_sigaltstack( | |
684 | newstack ? (stack_t __user *) &uss : NULL, | |
685 | oldstack ? (stack_t __user *) &uoss : NULL, | |
686 | sp); | |
687 | set_fs(old_fs); | |
688 | /* Copy the stack information to the user output buffer */ | |
689 | if (!ret && oldstack && | |
29e646df | 690 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
691 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
692 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
693 | return -EFAULT; | |
694 | return ret; | |
695 | } | |
81e7009e | 696 | #endif /* CONFIG_PPC64 */ |
1da177e4 | 697 | |
1da177e4 LT |
698 | /* |
699 | * Set up a signal frame for a "real-time" signal handler | |
700 | * (one which gets siginfo). | |
701 | */ | |
f478f543 | 702 | int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka, |
81e7009e | 703 | siginfo_t *info, sigset_t *oldset, |
a3f61dc0 | 704 | struct pt_regs *regs) |
1da177e4 | 705 | { |
81e7009e SR |
706 | struct rt_sigframe __user *rt_sf; |
707 | struct mcontext __user *frame; | |
d0c3d534 | 708 | void __user *addr; |
a3f61dc0 | 709 | unsigned long newsp = 0; |
1da177e4 LT |
710 | |
711 | /* Set up Signal Frame */ | |
712 | /* Put a Real Time Context onto stack */ | |
a3f61dc0 | 713 | rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf)); |
d0c3d534 | 714 | addr = rt_sf; |
a3f61dc0 | 715 | if (unlikely(rt_sf == NULL)) |
1da177e4 LT |
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; | |
d0c3d534 | 733 | addr = frame; |
a5bba930 | 734 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
735 | if (save_user_regs(regs, frame, 0)) |
736 | goto badframe; | |
a5bba930 | 737 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 738 | } else { |
1da177e4 LT |
739 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
740 | goto badframe; | |
741 | regs->link = (unsigned long) frame->tramp; | |
742 | } | |
cc657f53 PM |
743 | |
744 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
745 | ||
a3f61dc0 BH |
746 | /* create a stack frame for the caller of the handler */ |
747 | newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16); | |
d0c3d534 | 748 | addr = (void __user *)regs->gpr[1]; |
e2b55306 | 749 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e | 750 | goto badframe; |
a3f61dc0 BH |
751 | |
752 | /* Fill registers for signal handler */ | |
81e7009e | 753 | regs->gpr[1] = newsp; |
1da177e4 LT |
754 | regs->gpr[3] = sig; |
755 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
756 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
757 | regs->gpr[6] = (unsigned long) rt_sf; | |
758 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
759 | /* enter the signal handler in big-endian mode */ |
760 | regs->msr &= ~MSR_LE; | |
1da177e4 | 761 | regs->trap = 0; |
1da177e4 LT |
762 | return 1; |
763 | ||
764 | badframe: | |
81e7009e | 765 | #ifdef DEBUG_SIG |
1da177e4 LT |
766 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
767 | regs, frame, newsp); | |
768 | #endif | |
d0c3d534 OJ |
769 | if (show_unhandled_signals && printk_ratelimit()) |
770 | printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: " | |
771 | "%p nip %08lx lr %08lx\n", | |
772 | current->comm, current->pid, | |
773 | addr, regs->nip, regs->link); | |
774 | ||
1da177e4 LT |
775 | force_sigsegv(sig, current); |
776 | return 0; | |
777 | } | |
778 | ||
81e7009e | 779 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 780 | { |
1da177e4 | 781 | sigset_t set; |
81e7009e SR |
782 | struct mcontext __user *mcp; |
783 | ||
784 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
785 | return -EFAULT; | |
786 | #ifdef CONFIG_PPC64 | |
787 | { | |
788 | u32 cmcp; | |
1da177e4 | 789 | |
81e7009e SR |
790 | if (__get_user(cmcp, &ucp->uc_regs)) |
791 | return -EFAULT; | |
792 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 793 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
794 | } |
795 | #else | |
796 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 797 | return -EFAULT; |
7c85d1f9 PM |
798 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
799 | return -EFAULT; | |
81e7009e | 800 | #endif |
1da177e4 | 801 | restore_sigmask(&set); |
81e7009e | 802 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
803 | return -EFAULT; |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
81e7009e | 808 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
809 | struct ucontext __user *new_ctx, |
810 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
811 | { |
812 | unsigned char tmp; | |
1da177e4 LT |
813 | |
814 | /* Context size is for future use. Right now, we only make sure | |
815 | * we are passed something we understand | |
816 | */ | |
81e7009e | 817 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
818 | return -EINVAL; |
819 | ||
820 | if (old_ctx != NULL) { | |
1c9bb1a0 PM |
821 | struct mcontext __user *mctx; |
822 | ||
823 | /* | |
824 | * old_ctx might not be 16-byte aligned, in which | |
825 | * case old_ctx->uc_mcontext won't be either. | |
826 | * Because we have the old_ctx->uc_pad2 field | |
827 | * before old_ctx->uc_mcontext, we need to round down | |
828 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
829 | */ | |
830 | mctx = (struct mcontext __user *) | |
831 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
1da177e4 | 832 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
1c9bb1a0 | 833 | || save_user_regs(regs, mctx, 0) |
81e7009e | 834 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 835 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
836 | return -EFAULT; |
837 | } | |
838 | if (new_ctx == NULL) | |
839 | return 0; | |
840 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
841 | || __get_user(tmp, (u8 __user *) new_ctx) | |
842 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
843 | return -EFAULT; | |
844 | ||
845 | /* | |
846 | * If we get a fault copying the context into the kernel's | |
847 | * image of the user's registers, we can't just return -EFAULT | |
848 | * because the user's registers will be corrupted. For instance | |
849 | * the NIP value may have been updated but not some of the | |
850 | * other registers. Given that we have done the access_ok | |
851 | * and successfully read the first and last bytes of the region | |
852 | * above, this should only happen in an out-of-memory situation | |
853 | * or if another thread unmaps the region containing the context. | |
854 | * We kill the task with a SIGSEGV in this situation. | |
855 | */ | |
81e7009e | 856 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 857 | do_exit(SIGSEGV); |
401d1f02 DW |
858 | |
859 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
860 | return 0; |
861 | } | |
862 | ||
81e7009e | 863 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
864 | struct pt_regs *regs) |
865 | { | |
81e7009e | 866 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
867 | |
868 | /* Always make any pending restarted system calls return -EINTR */ | |
869 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
870 | ||
81e7009e SR |
871 | rt_sf = (struct rt_sigframe __user *) |
872 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
873 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
874 | goto bad; | |
81e7009e | 875 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
876 | goto bad; |
877 | ||
878 | /* | |
879 | * It's not clear whether or why it is desirable to save the | |
880 | * sigaltstack setting on signal delivery and restore it on | |
881 | * signal return. But other architectures do this and we have | |
882 | * always done it up until now so it is probably better not to | |
883 | * change it. -- paulus | |
81e7009e SR |
884 | */ |
885 | #ifdef CONFIG_PPC64 | |
886 | /* | |
b09a4913 | 887 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
888 | * and takes userland pointer directly. What about error checking ? |
889 | * nobody does any... | |
890 | */ | |
b09a4913 | 891 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
892 | #else |
893 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 894 | #endif |
401d1f02 DW |
895 | set_thread_flag(TIF_RESTOREALL); |
896 | return 0; | |
1da177e4 LT |
897 | |
898 | bad: | |
d0c3d534 OJ |
899 | if (show_unhandled_signals && printk_ratelimit()) |
900 | printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: " | |
901 | "%p nip %08lx lr %08lx\n", | |
902 | current->comm, current->pid, | |
903 | rt_sf, regs->nip, regs->link); | |
904 | ||
1da177e4 LT |
905 | force_sig(SIGSEGV, current); |
906 | return 0; | |
907 | } | |
908 | ||
81e7009e SR |
909 | #ifdef CONFIG_PPC32 |
910 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
911 | int ndbg, struct sig_dbg_op __user *dbg, | |
912 | int r6, int r7, int r8, | |
913 | struct pt_regs *regs) | |
914 | { | |
915 | struct sig_dbg_op op; | |
916 | int i; | |
7c85d1f9 | 917 | unsigned char tmp; |
81e7009e SR |
918 | unsigned long new_msr = regs->msr; |
919 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
920 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
921 | #endif | |
922 | ||
923 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 924 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
925 | return -EFAULT; |
926 | switch (op.dbg_type) { | |
927 | case SIG_DBG_SINGLE_STEPPING: | |
928 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
929 | if (op.dbg_value) { | |
930 | new_msr |= MSR_DE; | |
931 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
932 | } else { | |
933 | new_msr &= ~MSR_DE; | |
934 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
935 | } | |
936 | #else | |
937 | if (op.dbg_value) | |
938 | new_msr |= MSR_SE; | |
939 | else | |
940 | new_msr &= ~MSR_SE; | |
941 | #endif | |
942 | break; | |
943 | case SIG_DBG_BRANCH_TRACING: | |
944 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
945 | return -EINVAL; | |
946 | #else | |
947 | if (op.dbg_value) | |
948 | new_msr |= MSR_BE; | |
949 | else | |
950 | new_msr &= ~MSR_BE; | |
951 | #endif | |
952 | break; | |
953 | ||
954 | default: | |
955 | return -EINVAL; | |
956 | } | |
957 | } | |
958 | ||
959 | /* We wait until here to actually install the values in the | |
960 | registers so if we fail in the above loop, it will not | |
961 | affect the contents of these registers. After this point, | |
962 | failure is a problem, anyway, and it's very unlikely unless | |
963 | the user is really doing something wrong. */ | |
964 | regs->msr = new_msr; | |
965 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
966 | current->thread.dbcr0 = new_dbcr0; | |
967 | #endif | |
968 | ||
7c85d1f9 PM |
969 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
970 | || __get_user(tmp, (u8 __user *) ctx) | |
971 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
972 | return -EFAULT; | |
973 | ||
81e7009e SR |
974 | /* |
975 | * If we get a fault copying the context into the kernel's | |
976 | * image of the user's registers, we can't just return -EFAULT | |
977 | * because the user's registers will be corrupted. For instance | |
978 | * the NIP value may have been updated but not some of the | |
979 | * other registers. Given that we have done the access_ok | |
980 | * and successfully read the first and last bytes of the region | |
981 | * above, this should only happen in an out-of-memory situation | |
982 | * or if another thread unmaps the region containing the context. | |
983 | * We kill the task with a SIGSEGV in this situation. | |
984 | */ | |
985 | if (do_setcontext(ctx, regs, 1)) { | |
d0c3d534 OJ |
986 | if (show_unhandled_signals && printk_ratelimit()) |
987 | printk(KERN_INFO "%s[%d]: bad frame in " | |
988 | "sys_debug_setcontext: %p nip %08lx " | |
989 | "lr %08lx\n", | |
990 | current->comm, current->pid, | |
991 | ctx, regs->nip, regs->link); | |
992 | ||
81e7009e SR |
993 | force_sig(SIGSEGV, current); |
994 | goto out; | |
995 | } | |
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 | |
1003 | */ | |
1004 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1005 | ||
401d1f02 | 1006 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1007 | out: |
1008 | return 0; | |
1009 | } | |
1010 | #endif | |
1da177e4 LT |
1011 | |
1012 | /* | |
1013 | * OK, we're invoking a handler | |
1014 | */ | |
f478f543 | 1015 | int handle_signal32(unsigned long sig, struct k_sigaction *ka, |
a3f61dc0 | 1016 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 1017 | { |
81e7009e | 1018 | struct sigcontext __user *sc; |
a3f61dc0 BH |
1019 | struct sigframe __user *frame; |
1020 | unsigned long newsp = 0; | |
1da177e4 LT |
1021 | |
1022 | /* Set up Signal Frame */ | |
a3f61dc0 BH |
1023 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
1024 | if (unlikely(frame == NULL)) | |
1da177e4 | 1025 | goto badframe; |
a3f61dc0 | 1026 | sc = (struct sigcontext __user *) &frame->sctx; |
1da177e4 LT |
1027 | |
1028 | #if _NSIG != 64 | |
81e7009e | 1029 | #error "Please adjust handle_signal()" |
1da177e4 | 1030 | #endif |
81e7009e | 1031 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1032 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1033 | #ifdef CONFIG_PPC64 |
1da177e4 | 1034 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1035 | #else |
1036 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1037 | #endif | |
a3f61dc0 | 1038 | || __put_user(to_user_ptr(&frame->mctx), &sc->regs) |
1da177e4 LT |
1039 | || __put_user(sig, &sc->signal)) |
1040 | goto badframe; | |
1041 | ||
a5bba930 | 1042 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
1043 | if (save_user_regs(regs, &frame->mctx, 0)) |
1044 | goto badframe; | |
a5bba930 | 1045 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1046 | } else { |
1da177e4 LT |
1047 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1048 | goto badframe; | |
1049 | regs->link = (unsigned long) frame->mctx.tramp; | |
1050 | } | |
1051 | ||
cc657f53 PM |
1052 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1053 | ||
a3f61dc0 BH |
1054 | /* create a stack frame for the caller of the handler */ |
1055 | newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE; | |
9747dd6f | 1056 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1057 | goto badframe; |
a3f61dc0 | 1058 | |
81e7009e | 1059 | regs->gpr[1] = newsp; |
1da177e4 LT |
1060 | regs->gpr[3] = sig; |
1061 | regs->gpr[4] = (unsigned long) sc; | |
1062 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1063 | /* enter the signal handler in big-endian mode */ |
1064 | regs->msr &= ~MSR_LE; | |
1da177e4 | 1065 | regs->trap = 0; |
1da177e4 LT |
1066 | |
1067 | return 1; | |
1068 | ||
1069 | badframe: | |
81e7009e SR |
1070 | #ifdef DEBUG_SIG |
1071 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1072 | regs, frame, newsp); | |
1da177e4 | 1073 | #endif |
d0c3d534 OJ |
1074 | if (show_unhandled_signals && printk_ratelimit()) |
1075 | printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: " | |
1076 | "%p nip %08lx lr %08lx\n", | |
1077 | current->comm, current->pid, | |
1078 | frame, regs->nip, regs->link); | |
1079 | ||
1da177e4 LT |
1080 | force_sigsegv(sig, current); |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * Do a signal return; undo the signal stack. | |
1086 | */ | |
81e7009e | 1087 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1088 | struct pt_regs *regs) |
1089 | { | |
81e7009e SR |
1090 | struct sigcontext __user *sc; |
1091 | struct sigcontext sigctx; | |
1092 | struct mcontext __user *sr; | |
d0c3d534 | 1093 | void __user *addr; |
1da177e4 | 1094 | sigset_t set; |
1da177e4 LT |
1095 | |
1096 | /* Always make any pending restarted system calls return -EINTR */ | |
1097 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1098 | ||
81e7009e | 1099 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
d0c3d534 | 1100 | addr = sc; |
1da177e4 LT |
1101 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1102 | goto badframe; | |
1103 | ||
81e7009e | 1104 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1105 | /* |
1106 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1107 | * unused part of the signal stackframe | |
1108 | */ | |
1109 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1110 | #else |
1111 | set.sig[0] = sigctx.oldmask; | |
1112 | set.sig[1] = sigctx._unused[3]; | |
1113 | #endif | |
1da177e4 LT |
1114 | restore_sigmask(&set); |
1115 | ||
81e7009e | 1116 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
d0c3d534 | 1117 | addr = sr; |
1da177e4 LT |
1118 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1119 | || restore_user_regs(regs, sr, 1)) | |
1120 | goto badframe; | |
1121 | ||
401d1f02 | 1122 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1123 | return 0; |
1da177e4 LT |
1124 | |
1125 | badframe: | |
d0c3d534 OJ |
1126 | if (show_unhandled_signals && printk_ratelimit()) |
1127 | printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: " | |
1128 | "%p nip %08lx lr %08lx\n", | |
1129 | current->comm, current->pid, | |
1130 | addr, regs->nip, regs->link); | |
1131 | ||
1da177e4 LT |
1132 | force_sig(SIGSEGV, current); |
1133 | return 0; | |
1134 | } |