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 | |
81e7009e | 54 | #undef DEBUG_SIG |
1da177e4 LT |
55 | |
56 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
57 | ||
81e7009e SR |
58 | #ifdef CONFIG_PPC64 |
59 | #define do_signal do_signal32 | |
b09a4913 SR |
60 | #define sys_sigsuspend compat_sys_sigsuspend |
61 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
62 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
63 | #define sys_sigaction compat_sys_sigaction | |
64 | #define sys_swapcontext compat_sys_swapcontext | |
65 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
66 | |
67 | #define old_sigaction old_sigaction32 | |
68 | #define sigcontext sigcontext32 | |
69 | #define mcontext mcontext32 | |
70 | #define ucontext ucontext32 | |
71 | ||
72 | /* | |
73 | * Returning 0 means we return to userspace via | |
74 | * ret_from_except and thus restore all user | |
75 | * registers from *regs. This is what we need | |
76 | * to do when a signal has been delivered. | |
77 | */ | |
81e7009e SR |
78 | |
79 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
80 | #undef __SIGNAL_FRAMESIZE | |
81 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
82 | #undef ELF_NVRREG | |
83 | #define ELF_NVRREG ELF_NVRREG32 | |
84 | ||
85 | /* | |
86 | * Functions for flipping sigsets (thanks to brain dead generic | |
87 | * implementation that makes things simple for little endian only) | |
88 | */ | |
89 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
90 | { | |
91 | compat_sigset_t cset; | |
92 | ||
93 | switch (_NSIG_WORDS) { | |
94 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
95 | cset.sig[7] = set->sig[3] >> 32; | |
96 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
97 | cset.sig[5] = set->sig[2] >> 32; | |
98 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
99 | cset.sig[3] = set->sig[1] >> 32; | |
100 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
101 | cset.sig[1] = set->sig[0] >> 32; | |
102 | } | |
103 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
104 | } | |
105 | ||
9b7cf8b4 PM |
106 | static inline int get_sigset_t(sigset_t *set, |
107 | const compat_sigset_t __user *uset) | |
81e7009e SR |
108 | { |
109 | compat_sigset_t s32; | |
110 | ||
111 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
112 | return -EFAULT; | |
113 | ||
114 | /* | |
115 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
116 | * in the "wrong" endian in 32-bit user storage). | |
117 | */ | |
118 | switch (_NSIG_WORDS) { | |
119 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
120 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
121 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
122 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
128 | struct old_sigaction __user *act) | |
129 | { | |
130 | compat_old_sigset_t mask; | |
131 | compat_uptr_t handler, restorer; | |
132 | ||
133 | if (get_user(handler, &act->sa_handler) || | |
134 | __get_user(restorer, &act->sa_restorer) || | |
135 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
136 | __get_user(mask, &act->sa_mask)) | |
137 | return -EFAULT; | |
138 | new_ka->sa.sa_handler = compat_ptr(handler); | |
139 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
140 | siginitset(&new_ka->sa.sa_mask, mask); | |
141 | return 0; | |
142 | } | |
143 | ||
29e646df | 144 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
145 | #define from_user_ptr(p) compat_ptr(p) |
146 | ||
147 | static inline int save_general_regs(struct pt_regs *regs, | |
148 | struct mcontext __user *frame) | |
149 | { | |
150 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
151 | int i; | |
152 | ||
1bd79336 | 153 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
154 | |
155 | for (i = 0; i <= PT_RESULT; i ++) { | |
156 | if (i == 14 && !FULL_REGS(regs)) | |
157 | i = 32; | |
81e7009e SR |
158 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
159 | return -EFAULT; | |
401d1f02 | 160 | } |
81e7009e SR |
161 | return 0; |
162 | } | |
163 | ||
164 | static inline int restore_general_regs(struct pt_regs *regs, | |
165 | struct mcontext __user *sr) | |
166 | { | |
167 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
168 | int i; | |
169 | ||
170 | for (i = 0; i <= PT_RESULT; i++) { | |
171 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
172 | continue; | |
173 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
174 | return -EFAULT; | |
175 | } | |
176 | return 0; | |
177 | } | |
178 | ||
179 | #else /* CONFIG_PPC64 */ | |
180 | ||
81e7009e SR |
181 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
182 | ||
183 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
184 | { | |
185 | return copy_to_user(uset, set, sizeof(*uset)); | |
186 | } | |
187 | ||
9b7cf8b4 | 188 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
189 | { |
190 | return copy_from_user(set, uset, sizeof(*uset)); | |
191 | } | |
192 | ||
193 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
194 | struct old_sigaction __user *act) | |
195 | { | |
196 | old_sigset_t mask; | |
197 | ||
198 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
199 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
200 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
201 | return -EFAULT; | |
202 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
203 | __get_user(mask, &act->sa_mask); | |
204 | siginitset(&new_ka->sa.sa_mask, mask); | |
205 | return 0; | |
206 | } | |
207 | ||
29e646df AV |
208 | #define to_user_ptr(p) ((unsigned long)(p)) |
209 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
210 | |
211 | static inline int save_general_regs(struct pt_regs *regs, | |
212 | struct mcontext __user *frame) | |
213 | { | |
1bd79336 | 214 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
215 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
216 | } | |
217 | ||
218 | static inline int restore_general_regs(struct pt_regs *regs, | |
219 | struct mcontext __user *sr) | |
220 | { | |
221 | /* copy up to but not including MSR */ | |
222 | if (__copy_from_user(regs, &sr->mc_gregs, | |
223 | PT_MSR * sizeof(elf_greg_t))) | |
224 | return -EFAULT; | |
225 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
226 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
227 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
228 | return -EFAULT; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | #endif /* CONFIG_PPC64 */ | |
233 | ||
234 | int do_signal(sigset_t *oldset, struct pt_regs *regs); | |
235 | ||
236 | /* | |
237 | * Atomically swap in the new signal mask, and wait for a signal. | |
238 | */ | |
150256d8 | 239 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 240 | { |
81e7009e SR |
241 | mask &= _BLOCKABLE; |
242 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 243 | current->saved_sigmask = current->blocked; |
81e7009e SR |
244 | siginitset(¤t->blocked, mask); |
245 | recalc_sigpending(); | |
246 | spin_unlock_irq(¤t->sighand->siglock); | |
247 | ||
150256d8 DW |
248 | current->state = TASK_INTERRUPTIBLE; |
249 | schedule(); | |
250 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
251 | return -ERESTARTNOHAND; | |
81e7009e SR |
252 | } |
253 | ||
254 | #ifdef CONFIG_PPC32 | |
255 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, | |
256 | int r6, int r7, int r8, struct pt_regs *regs) | |
257 | { | |
258 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
259 | } | |
260 | #endif | |
261 | ||
262 | long sys_sigaction(int sig, struct old_sigaction __user *act, | |
263 | struct old_sigaction __user *oact) | |
264 | { | |
265 | struct k_sigaction new_ka, old_ka; | |
266 | int ret; | |
267 | ||
268 | #ifdef CONFIG_PPC64 | |
269 | if (sig < 0) | |
270 | sig = -sig; | |
271 | #endif | |
272 | ||
273 | if (act) { | |
274 | if (get_old_sigaction(&new_ka, act)) | |
275 | return -EFAULT; | |
276 | } | |
277 | ||
278 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
279 | if (!ret && oact) { | |
280 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
281 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
282 | &oact->sa_handler) || | |
283 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
284 | &oact->sa_restorer) || | |
285 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
286 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
287 | return -EFAULT; | |
288 | } | |
289 | ||
290 | return ret; | |
291 | } | |
1da177e4 LT |
292 | |
293 | /* | |
294 | * When we have signals to deliver, we set up on the | |
295 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
296 | * a sigregs struct |
297 | * a sigcontext struct | |
298 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
299 | * |
300 | * Each of these things must be a multiple of 16 bytes in size. | |
301 | * | |
302 | */ | |
81e7009e SR |
303 | struct sigregs { |
304 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
305 | /* |
306 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
307 | * regs and 18 fp regs below sp before decrementing it. | |
308 | */ | |
309 | int abigap[56]; | |
310 | }; | |
311 | ||
312 | /* We use the mc_pad field for the signal return trampoline. */ | |
313 | #define tramp mc_pad | |
314 | ||
315 | /* | |
316 | * When we have rt signals to deliver, we set up on the | |
317 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
318 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
319 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
320 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
321 | * positions as in older kernels). |
322 | * | |
323 | * Each of these things must be a multiple of 16 bytes in size. | |
324 | * | |
325 | */ | |
81e7009e SR |
326 | struct rt_sigframe { |
327 | #ifdef CONFIG_PPC64 | |
328 | compat_siginfo_t info; | |
329 | #else | |
330 | struct siginfo info; | |
331 | #endif | |
332 | struct ucontext uc; | |
1da177e4 LT |
333 | /* |
334 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
335 | * regs and 18 fp regs below sp before decrementing it. | |
336 | */ | |
337 | int abigap[56]; | |
338 | }; | |
339 | ||
1da177e4 LT |
340 | /* |
341 | * Save the current user registers on the user stack. | |
81e7009e SR |
342 | * We only save the altivec/spe registers if the process has used |
343 | * altivec/spe instructions at some point. | |
1da177e4 | 344 | */ |
81e7009e SR |
345 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
346 | int sigret) | |
1da177e4 | 347 | { |
1da177e4 LT |
348 | /* Make sure floating point registers are stored in regs */ |
349 | flush_fp_to_thread(current); | |
350 | ||
351 | /* save general and floating-point registers */ | |
81e7009e SR |
352 | if (save_general_regs(regs, frame) || |
353 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
354 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
355 | return 1; |
356 | ||
1da177e4 LT |
357 | #ifdef CONFIG_ALTIVEC |
358 | /* save altivec registers */ | |
359 | if (current->thread.used_vr) { | |
360 | flush_altivec_to_thread(current); | |
361 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 362 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
363 | return 1; |
364 | /* set MSR_VEC in the saved MSR value to indicate that | |
365 | frame->mc_vregs contains valid data */ | |
366 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
367 | return 1; | |
368 | } | |
369 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
370 | ||
371 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
372 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
373 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
374 | * most significant bits of that same vector. --BenH | |
375 | */ | |
376 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
377 | return 1; | |
378 | #endif /* CONFIG_ALTIVEC */ | |
379 | ||
81e7009e SR |
380 | #ifdef CONFIG_SPE |
381 | /* save spe registers */ | |
382 | if (current->thread.used_spe) { | |
383 | flush_spe_to_thread(current); | |
384 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
385 | ELF_NEVRREG * sizeof(u32))) | |
386 | return 1; | |
387 | /* set MSR_SPE in the saved MSR value to indicate that | |
388 | frame->mc_vregs contains valid data */ | |
389 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
390 | return 1; | |
391 | } | |
392 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
393 | ||
394 | /* We always copy to/from spefscr */ | |
395 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
396 | return 1; | |
397 | #endif /* CONFIG_SPE */ | |
398 | ||
1da177e4 LT |
399 | if (sigret) { |
400 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
401 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
402 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
403 | return 1; | |
404 | flush_icache_range((unsigned long) &frame->tramp[0], | |
405 | (unsigned long) &frame->tramp[2]); | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Restore the current user register values from the user stack, | |
413 | * (except for MSR). | |
414 | */ | |
415 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 416 | struct mcontext __user *sr, int sig) |
1da177e4 | 417 | { |
81e7009e | 418 | long err; |
1da177e4 | 419 | unsigned int save_r2 = 0; |
1da177e4 | 420 | unsigned long msr; |
1da177e4 LT |
421 | |
422 | /* | |
423 | * restore general registers but not including MSR or SOFTE. Also | |
424 | * take care of keeping r2 (TLS) intact if not a signal | |
425 | */ | |
426 | if (!sig) | |
427 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 428 | err = restore_general_regs(regs, sr); |
fab5db97 | 429 | err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); |
1da177e4 LT |
430 | if (!sig) |
431 | regs->gpr[2] = (unsigned long) save_r2; | |
432 | if (err) | |
433 | return 1; | |
434 | ||
fab5db97 PM |
435 | /* if doing signal return, restore the previous little-endian mode */ |
436 | if (sig) | |
437 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
438 | ||
5388fb10 PM |
439 | /* |
440 | * Do this before updating the thread state in | |
441 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
442 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
443 | * tempted to save the current CPU state into the thread_struct | |
444 | * and corrupt what we are writing there. | |
445 | */ | |
446 | discard_lazy_cpu_state(); | |
447 | ||
1da177e4 LT |
448 | /* force the process to reload the FP registers from |
449 | current->thread when it next does FP instructions */ | |
450 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
451 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
452 | sizeof(sr->mc_fregs))) | |
453 | return 1; | |
454 | ||
455 | #ifdef CONFIG_ALTIVEC | |
456 | /* force the process to reload the altivec registers from | |
457 | current->thread when it next does altivec instructions */ | |
458 | regs->msr &= ~MSR_VEC; | |
fab5db97 | 459 | if (msr & MSR_VEC) { |
1da177e4 LT |
460 | /* restore altivec registers from the stack */ |
461 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
462 | sizeof(sr->mc_vregs))) | |
463 | return 1; | |
464 | } else if (current->thread.used_vr) | |
81e7009e | 465 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
466 | |
467 | /* Always get VRSAVE back */ | |
468 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
469 | return 1; | |
470 | #endif /* CONFIG_ALTIVEC */ | |
471 | ||
81e7009e SR |
472 | #ifdef CONFIG_SPE |
473 | /* force the process to reload the spe registers from | |
474 | current->thread when it next does spe instructions */ | |
475 | regs->msr &= ~MSR_SPE; | |
fab5db97 | 476 | if (msr & MSR_SPE) { |
81e7009e SR |
477 | /* restore spe registers from the stack */ |
478 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
479 | ELF_NEVRREG * sizeof(u32))) | |
480 | return 1; | |
481 | } else if (current->thread.used_spe) | |
482 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
483 | ||
484 | /* Always get SPEFSCR back */ | |
485 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
486 | return 1; | |
487 | #endif /* CONFIG_SPE */ | |
488 | ||
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | ||
81e7009e | 492 | #ifdef CONFIG_PPC64 |
b09a4913 | 493 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
494 | struct sigaction32 __user *oact, size_t sigsetsize) |
495 | { | |
496 | struct k_sigaction new_ka, old_ka; | |
497 | int ret; | |
1da177e4 LT |
498 | |
499 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
500 | if (sigsetsize != sizeof(compat_sigset_t)) | |
501 | return -EINVAL; | |
502 | ||
503 | if (act) { | |
504 | compat_uptr_t handler; | |
505 | ||
506 | ret = get_user(handler, &act->sa_handler); | |
507 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 508 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
509 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
510 | if (ret) | |
511 | return -EFAULT; | |
512 | } | |
513 | ||
514 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
515 | if (!ret && oact) { | |
29e646df | 516 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 517 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
518 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
519 | } | |
520 | return ret; | |
521 | } | |
522 | ||
523 | /* | |
524 | * Note: it is necessary to treat how as an unsigned int, with the | |
525 | * corresponding cast to a signed int to insure that the proper | |
526 | * conversion (sign extension) between the register representation | |
527 | * of a signed int (msr in 32-bit mode) and the register representation | |
528 | * of a signed int (msr in 64-bit mode) is performed. | |
529 | */ | |
b09a4913 | 530 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
531 | compat_sigset_t __user *oset, size_t sigsetsize) |
532 | { | |
533 | sigset_t s; | |
534 | sigset_t __user *up; | |
1da177e4 LT |
535 | int ret; |
536 | mm_segment_t old_fs = get_fs(); | |
537 | ||
538 | if (set) { | |
81e7009e SR |
539 | if (get_sigset_t(&s, set)) |
540 | return -EFAULT; | |
1da177e4 | 541 | } |
81e7009e | 542 | |
1da177e4 LT |
543 | set_fs(KERNEL_DS); |
544 | /* This is valid because of the set_fs() */ | |
545 | up = (sigset_t __user *) &s; | |
546 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 547 | sigsetsize); |
1da177e4 LT |
548 | set_fs(old_fs); |
549 | if (ret) | |
550 | return ret; | |
551 | if (oset) { | |
81e7009e | 552 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
553 | return -EFAULT; |
554 | } | |
555 | return 0; | |
556 | } | |
557 | ||
b09a4913 | 558 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
559 | { |
560 | sigset_t s; | |
1da177e4 LT |
561 | int ret; |
562 | mm_segment_t old_fs = get_fs(); | |
563 | ||
564 | set_fs(KERNEL_DS); | |
565 | /* The __user pointer cast is valid because of the set_fs() */ | |
566 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
567 | set_fs(old_fs); | |
568 | if (!ret) { | |
81e7009e | 569 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
570 | return -EFAULT; |
571 | } | |
572 | return ret; | |
573 | } | |
574 | ||
575 | ||
576 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
577 | { | |
578 | int err; | |
579 | ||
580 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
581 | return -EFAULT; | |
582 | ||
583 | /* If you change siginfo_t structure, please be sure | |
584 | * this code is fixed accordingly. | |
585 | * It should never copy any pad contained in the structure | |
586 | * to avoid security leaks, but must copy the generic | |
587 | * 3 ints plus the relevant union member. | |
588 | * This routine must convert siginfo from 64bit to 32bit as well | |
589 | * at the same time. | |
590 | */ | |
591 | err = __put_user(s->si_signo, &d->si_signo); | |
592 | err |= __put_user(s->si_errno, &d->si_errno); | |
593 | err |= __put_user((short)s->si_code, &d->si_code); | |
594 | if (s->si_code < 0) | |
595 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
596 | SI_PAD_SIZE32); | |
597 | else switch(s->si_code >> 16) { | |
598 | case __SI_CHLD >> 16: | |
599 | err |= __put_user(s->si_pid, &d->si_pid); | |
600 | err |= __put_user(s->si_uid, &d->si_uid); | |
601 | err |= __put_user(s->si_utime, &d->si_utime); | |
602 | err |= __put_user(s->si_stime, &d->si_stime); | |
603 | err |= __put_user(s->si_status, &d->si_status); | |
604 | break; | |
605 | case __SI_FAULT >> 16: | |
606 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
607 | &d->si_addr); | |
608 | break; | |
609 | case __SI_POLL >> 16: | |
610 | err |= __put_user(s->si_band, &d->si_band); | |
611 | err |= __put_user(s->si_fd, &d->si_fd); | |
612 | break; | |
613 | case __SI_TIMER >> 16: | |
614 | err |= __put_user(s->si_tid, &d->si_tid); | |
615 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
616 | err |= __put_user(s->si_int, &d->si_int); | |
617 | break; | |
618 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
619 | case __SI_MESGQ >> 16: | |
620 | err |= __put_user(s->si_int, &d->si_int); | |
621 | /* fallthrough */ | |
622 | case __SI_KILL >> 16: | |
623 | default: | |
624 | err |= __put_user(s->si_pid, &d->si_pid); | |
625 | err |= __put_user(s->si_uid, &d->si_uid); | |
626 | break; | |
627 | } | |
628 | return err; | |
629 | } | |
630 | ||
81e7009e SR |
631 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
632 | ||
1da177e4 LT |
633 | /* |
634 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
635 | * corresponding cast to a signed int to insure that the proper conversion | |
636 | * (sign extension) between the register representation of a signed int | |
637 | * (msr in 32-bit mode) and the register representation of a signed int | |
638 | * (msr in 64-bit mode) is performed. | |
639 | */ | |
b09a4913 | 640 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
641 | { |
642 | siginfo_t info; | |
643 | int ret; | |
644 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 645 | |
1da177e4 LT |
646 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
647 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
648 | return -EFAULT; | |
649 | set_fs (KERNEL_DS); | |
650 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
651 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
652 | set_fs (old_fs); | |
653 | return ret; | |
654 | } | |
1da177e4 LT |
655 | /* |
656 | * Start Alternate signal stack support | |
657 | * | |
658 | * System Calls | |
b09a4913 | 659 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
660 | */ |
661 | ||
b09a4913 | 662 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
663 | int r6, int r7, int r8, struct pt_regs *regs) |
664 | { | |
29e646df AV |
665 | stack_32_t __user * newstack = compat_ptr(__new); |
666 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
667 | stack_t uss, uoss; |
668 | int ret; | |
669 | mm_segment_t old_fs; | |
670 | unsigned long sp; | |
671 | compat_uptr_t ss_sp; | |
672 | ||
673 | /* | |
674 | * set sp to the user stack on entry to the system call | |
675 | * the system call router sets R9 to the saved registers | |
676 | */ | |
677 | sp = regs->gpr[1]; | |
678 | ||
679 | /* Put new stack info in local 64 bit stack struct */ | |
680 | if (newstack) { | |
681 | if (get_user(ss_sp, &newstack->ss_sp) || | |
682 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
683 | __get_user(uss.ss_size, &newstack->ss_size)) | |
684 | return -EFAULT; | |
685 | uss.ss_sp = compat_ptr(ss_sp); | |
686 | } | |
687 | ||
688 | old_fs = get_fs(); | |
689 | set_fs(KERNEL_DS); | |
690 | /* The __user pointer casts are valid because of the set_fs() */ | |
691 | ret = do_sigaltstack( | |
692 | newstack ? (stack_t __user *) &uss : NULL, | |
693 | oldstack ? (stack_t __user *) &uoss : NULL, | |
694 | sp); | |
695 | set_fs(old_fs); | |
696 | /* Copy the stack information to the user output buffer */ | |
697 | if (!ret && oldstack && | |
29e646df | 698 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
699 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
700 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
701 | return -EFAULT; | |
702 | return ret; | |
703 | } | |
81e7009e | 704 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
705 | |
706 | ||
81e7009e SR |
707 | /* |
708 | * Restore the user process's signal mask | |
709 | */ | |
710 | #ifdef CONFIG_PPC64 | |
711 | extern void restore_sigmask(sigset_t *set); | |
712 | #else /* CONFIG_PPC64 */ | |
713 | static void restore_sigmask(sigset_t *set) | |
714 | { | |
715 | sigdelsetmask(set, ~_BLOCKABLE); | |
716 | spin_lock_irq(¤t->sighand->siglock); | |
717 | current->blocked = *set; | |
718 | recalc_sigpending(); | |
719 | spin_unlock_irq(¤t->sighand->siglock); | |
720 | } | |
721 | #endif | |
722 | ||
1da177e4 LT |
723 | /* |
724 | * Set up a signal frame for a "real-time" signal handler | |
725 | * (one which gets siginfo). | |
726 | */ | |
81e7009e SR |
727 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
728 | siginfo_t *info, sigset_t *oldset, | |
729 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 730 | { |
81e7009e SR |
731 | struct rt_sigframe __user *rt_sf; |
732 | struct mcontext __user *frame; | |
1da177e4 | 733 | unsigned long origsp = newsp; |
1da177e4 LT |
734 | |
735 | /* Set up Signal Frame */ | |
736 | /* Put a Real Time Context onto stack */ | |
737 | newsp -= sizeof(*rt_sf); | |
81e7009e | 738 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
739 | |
740 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 741 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
742 | |
743 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
744 | goto badframe; | |
745 | ||
1da177e4 | 746 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 747 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
748 | || __put_user(0, &rt_sf->uc.uc_flags) |
749 | || __put_user(0, &rt_sf->uc.uc_link) | |
750 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
751 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
752 | &rt_sf->uc.uc_stack.ss_flags) | |
753 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
754 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
755 | &rt_sf->uc.uc_regs) | |
756 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
757 | goto badframe; |
758 | ||
759 | /* Save user registers on the stack */ | |
760 | frame = &rt_sf->uc.uc_mcontext; | |
a5bba930 | 761 | if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
762 | if (save_user_regs(regs, frame, 0)) |
763 | goto badframe; | |
a5bba930 | 764 | regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; |
a7f290da | 765 | } else { |
1da177e4 LT |
766 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
767 | goto badframe; | |
768 | regs->link = (unsigned long) frame->tramp; | |
769 | } | |
cc657f53 PM |
770 | |
771 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
772 | ||
e2b55306 | 773 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
774 | goto badframe; |
775 | regs->gpr[1] = newsp; | |
1da177e4 LT |
776 | regs->gpr[3] = sig; |
777 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
778 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
779 | regs->gpr[6] = (unsigned long) rt_sf; | |
780 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
781 | /* enter the signal handler in big-endian mode */ |
782 | regs->msr &= ~MSR_LE; | |
1da177e4 | 783 | regs->trap = 0; |
1da177e4 LT |
784 | return 1; |
785 | ||
786 | badframe: | |
81e7009e | 787 | #ifdef DEBUG_SIG |
1da177e4 LT |
788 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
789 | regs, frame, newsp); | |
790 | #endif | |
791 | force_sigsegv(sig, current); | |
792 | return 0; | |
793 | } | |
794 | ||
81e7009e | 795 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 796 | { |
1da177e4 | 797 | sigset_t set; |
81e7009e SR |
798 | struct mcontext __user *mcp; |
799 | ||
800 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
801 | return -EFAULT; | |
802 | #ifdef CONFIG_PPC64 | |
803 | { | |
804 | u32 cmcp; | |
1da177e4 | 805 | |
81e7009e SR |
806 | if (__get_user(cmcp, &ucp->uc_regs)) |
807 | return -EFAULT; | |
808 | mcp = (struct mcontext __user *)(u64)cmcp; | |
7c85d1f9 | 809 | /* no need to check access_ok(mcp), since mcp < 4GB */ |
81e7009e SR |
810 | } |
811 | #else | |
812 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 813 | return -EFAULT; |
7c85d1f9 PM |
814 | if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp))) |
815 | return -EFAULT; | |
81e7009e | 816 | #endif |
1da177e4 | 817 | restore_sigmask(&set); |
81e7009e | 818 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
819 | return -EFAULT; |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
81e7009e | 824 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
825 | struct ucontext __user *new_ctx, |
826 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
827 | { |
828 | unsigned char tmp; | |
1da177e4 LT |
829 | |
830 | /* Context size is for future use. Right now, we only make sure | |
831 | * we are passed something we understand | |
832 | */ | |
81e7009e | 833 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
834 | return -EINVAL; |
835 | ||
836 | if (old_ctx != NULL) { | |
1c9bb1a0 PM |
837 | struct mcontext __user *mctx; |
838 | ||
839 | /* | |
840 | * old_ctx might not be 16-byte aligned, in which | |
841 | * case old_ctx->uc_mcontext won't be either. | |
842 | * Because we have the old_ctx->uc_pad2 field | |
843 | * before old_ctx->uc_mcontext, we need to round down | |
844 | * from &old_ctx->uc_mcontext to a 16-byte boundary. | |
845 | */ | |
846 | mctx = (struct mcontext __user *) | |
847 | ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); | |
1da177e4 | 848 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
1c9bb1a0 | 849 | || save_user_regs(regs, mctx, 0) |
81e7009e | 850 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
1c9bb1a0 | 851 | || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) |
1da177e4 LT |
852 | return -EFAULT; |
853 | } | |
854 | if (new_ctx == NULL) | |
855 | return 0; | |
856 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
857 | || __get_user(tmp, (u8 __user *) new_ctx) | |
858 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
859 | return -EFAULT; | |
860 | ||
861 | /* | |
862 | * If we get a fault copying the context into the kernel's | |
863 | * image of the user's registers, we can't just return -EFAULT | |
864 | * because the user's registers will be corrupted. For instance | |
865 | * the NIP value may have been updated but not some of the | |
866 | * other registers. Given that we have done the access_ok | |
867 | * and successfully read the first and last bytes of the region | |
868 | * above, this should only happen in an out-of-memory situation | |
869 | * or if another thread unmaps the region containing the context. | |
870 | * We kill the task with a SIGSEGV in this situation. | |
871 | */ | |
81e7009e | 872 | if (do_setcontext(new_ctx, regs, 0)) |
1da177e4 | 873 | do_exit(SIGSEGV); |
401d1f02 DW |
874 | |
875 | set_thread_flag(TIF_RESTOREALL); | |
1da177e4 LT |
876 | return 0; |
877 | } | |
878 | ||
81e7009e | 879 | long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
880 | struct pt_regs *regs) |
881 | { | |
81e7009e | 882 | struct rt_sigframe __user *rt_sf; |
1da177e4 LT |
883 | |
884 | /* Always make any pending restarted system calls return -EINTR */ | |
885 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
886 | ||
81e7009e SR |
887 | rt_sf = (struct rt_sigframe __user *) |
888 | (regs->gpr[1] + __SIGNAL_FRAMESIZE + 16); | |
1da177e4 LT |
889 | if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf))) |
890 | goto bad; | |
81e7009e | 891 | if (do_setcontext(&rt_sf->uc, regs, 1)) |
1da177e4 LT |
892 | goto bad; |
893 | ||
894 | /* | |
895 | * It's not clear whether or why it is desirable to save the | |
896 | * sigaltstack setting on signal delivery and restore it on | |
897 | * signal return. But other architectures do this and we have | |
898 | * always done it up until now so it is probably better not to | |
899 | * change it. -- paulus | |
81e7009e SR |
900 | */ |
901 | #ifdef CONFIG_PPC64 | |
902 | /* | |
b09a4913 | 903 | * We use the compat_sys_ version that does the 32/64 bits conversion |
1da177e4 LT |
904 | * and takes userland pointer directly. What about error checking ? |
905 | * nobody does any... | |
906 | */ | |
b09a4913 | 907 | compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs); |
81e7009e SR |
908 | #else |
909 | do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]); | |
81e7009e | 910 | #endif |
401d1f02 DW |
911 | set_thread_flag(TIF_RESTOREALL); |
912 | return 0; | |
1da177e4 LT |
913 | |
914 | bad: | |
915 | force_sig(SIGSEGV, current); | |
916 | return 0; | |
917 | } | |
918 | ||
81e7009e SR |
919 | #ifdef CONFIG_PPC32 |
920 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
921 | int ndbg, struct sig_dbg_op __user *dbg, | |
922 | int r6, int r7, int r8, | |
923 | struct pt_regs *regs) | |
924 | { | |
925 | struct sig_dbg_op op; | |
926 | int i; | |
7c85d1f9 | 927 | unsigned char tmp; |
81e7009e SR |
928 | unsigned long new_msr = regs->msr; |
929 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
930 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
931 | #endif | |
932 | ||
933 | for (i=0; i<ndbg; i++) { | |
7c85d1f9 | 934 | if (copy_from_user(&op, dbg + i, sizeof(op))) |
81e7009e SR |
935 | return -EFAULT; |
936 | switch (op.dbg_type) { | |
937 | case SIG_DBG_SINGLE_STEPPING: | |
938 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
939 | if (op.dbg_value) { | |
940 | new_msr |= MSR_DE; | |
941 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
942 | } else { | |
943 | new_msr &= ~MSR_DE; | |
944 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
945 | } | |
946 | #else | |
947 | if (op.dbg_value) | |
948 | new_msr |= MSR_SE; | |
949 | else | |
950 | new_msr &= ~MSR_SE; | |
951 | #endif | |
952 | break; | |
953 | case SIG_DBG_BRANCH_TRACING: | |
954 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
955 | return -EINVAL; | |
956 | #else | |
957 | if (op.dbg_value) | |
958 | new_msr |= MSR_BE; | |
959 | else | |
960 | new_msr &= ~MSR_BE; | |
961 | #endif | |
962 | break; | |
963 | ||
964 | default: | |
965 | return -EINVAL; | |
966 | } | |
967 | } | |
968 | ||
969 | /* We wait until here to actually install the values in the | |
970 | registers so if we fail in the above loop, it will not | |
971 | affect the contents of these registers. After this point, | |
972 | failure is a problem, anyway, and it's very unlikely unless | |
973 | the user is really doing something wrong. */ | |
974 | regs->msr = new_msr; | |
975 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
976 | current->thread.dbcr0 = new_dbcr0; | |
977 | #endif | |
978 | ||
7c85d1f9 PM |
979 | if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)) |
980 | || __get_user(tmp, (u8 __user *) ctx) | |
981 | || __get_user(tmp, (u8 __user *) (ctx + 1) - 1)) | |
982 | return -EFAULT; | |
983 | ||
81e7009e SR |
984 | /* |
985 | * If we get a fault copying the context into the kernel's | |
986 | * image of the user's registers, we can't just return -EFAULT | |
987 | * because the user's registers will be corrupted. For instance | |
988 | * the NIP value may have been updated but not some of the | |
989 | * other registers. Given that we have done the access_ok | |
990 | * and successfully read the first and last bytes of the region | |
991 | * above, this should only happen in an out-of-memory situation | |
992 | * or if another thread unmaps the region containing the context. | |
993 | * We kill the task with a SIGSEGV in this situation. | |
994 | */ | |
995 | if (do_setcontext(ctx, regs, 1)) { | |
996 | force_sig(SIGSEGV, current); | |
997 | goto out; | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * It's not clear whether or why it is desirable to save the | |
1002 | * sigaltstack setting on signal delivery and restore it on | |
1003 | * signal return. But other architectures do this and we have | |
1004 | * always done it up until now so it is probably better not to | |
1005 | * change it. -- paulus | |
1006 | */ | |
1007 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
1008 | ||
401d1f02 | 1009 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
1010 | out: |
1011 | return 0; | |
1012 | } | |
1013 | #endif | |
1da177e4 LT |
1014 | |
1015 | /* | |
1016 | * OK, we're invoking a handler | |
1017 | */ | |
81e7009e SR |
1018 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
1019 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
1020 | unsigned long newsp) | |
1da177e4 | 1021 | { |
81e7009e SR |
1022 | struct sigcontext __user *sc; |
1023 | struct sigregs __user *frame; | |
1da177e4 LT |
1024 | unsigned long origsp = newsp; |
1025 | ||
1026 | /* Set up Signal Frame */ | |
81e7009e SR |
1027 | newsp -= sizeof(struct sigregs); |
1028 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1029 | |
1030 | /* Put a sigcontext on the stack */ | |
1031 | newsp -= sizeof(*sc); | |
81e7009e | 1032 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1033 | |
1034 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1035 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1036 | |
1037 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1038 | goto badframe; | |
1039 | ||
1040 | #if _NSIG != 64 | |
81e7009e | 1041 | #error "Please adjust handle_signal()" |
1da177e4 | 1042 | #endif |
81e7009e | 1043 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1044 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1045 | #ifdef CONFIG_PPC64 |
1da177e4 | 1046 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1047 | #else |
1048 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1049 | #endif | |
1050 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1051 | || __put_user(sig, &sc->signal)) |
1052 | goto badframe; | |
1053 | ||
a5bba930 | 1054 | if (vdso32_sigtramp && current->mm->context.vdso_base) { |
1da177e4 LT |
1055 | if (save_user_regs(regs, &frame->mctx, 0)) |
1056 | goto badframe; | |
a5bba930 | 1057 | regs->link = current->mm->context.vdso_base + vdso32_sigtramp; |
a7f290da | 1058 | } else { |
1da177e4 LT |
1059 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1060 | goto badframe; | |
1061 | regs->link = (unsigned long) frame->mctx.tramp; | |
1062 | } | |
1063 | ||
cc657f53 PM |
1064 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1065 | ||
9747dd6f | 1066 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1067 | goto badframe; |
81e7009e | 1068 | regs->gpr[1] = newsp; |
1da177e4 LT |
1069 | regs->gpr[3] = sig; |
1070 | regs->gpr[4] = (unsigned long) sc; | |
1071 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
fab5db97 PM |
1072 | /* enter the signal handler in big-endian mode */ |
1073 | regs->msr &= ~MSR_LE; | |
1da177e4 | 1074 | regs->trap = 0; |
1da177e4 LT |
1075 | |
1076 | return 1; | |
1077 | ||
1078 | badframe: | |
81e7009e SR |
1079 | #ifdef DEBUG_SIG |
1080 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1081 | regs, frame, newsp); | |
1da177e4 LT |
1082 | #endif |
1083 | force_sigsegv(sig, current); | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Do a signal return; undo the signal stack. | |
1089 | */ | |
81e7009e | 1090 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1091 | struct pt_regs *regs) |
1092 | { | |
81e7009e SR |
1093 | struct sigcontext __user *sc; |
1094 | struct sigcontext sigctx; | |
1095 | struct mcontext __user *sr; | |
1da177e4 | 1096 | sigset_t set; |
1da177e4 LT |
1097 | |
1098 | /* Always make any pending restarted system calls return -EINTR */ | |
1099 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1100 | ||
81e7009e | 1101 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1102 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1103 | goto badframe; | |
1104 | ||
81e7009e | 1105 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1106 | /* |
1107 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1108 | * unused part of the signal stackframe | |
1109 | */ | |
1110 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1111 | #else |
1112 | set.sig[0] = sigctx.oldmask; | |
1113 | set.sig[1] = sigctx._unused[3]; | |
1114 | #endif | |
1da177e4 LT |
1115 | restore_sigmask(&set); |
1116 | ||
81e7009e | 1117 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
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: | |
1126 | force_sig(SIGSEGV, current); | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1da177e4 LT |
1130 | /* |
1131 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1132 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1133 | * mistake. | |
1134 | */ | |
81e7009e | 1135 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
1da177e4 LT |
1136 | { |
1137 | siginfo_t info; | |
81e7009e | 1138 | struct k_sigaction ka; |
f27201da | 1139 | unsigned int newsp; |
1da177e4 | 1140 | int signr, ret; |
81e7009e SR |
1141 | |
1142 | #ifdef CONFIG_PPC32 | |
1143 | if (try_to_freeze()) { | |
1144 | signr = 0; | |
1145 | if (!signal_pending(current)) | |
1146 | goto no_signal; | |
1147 | } | |
1148 | #endif | |
1da177e4 | 1149 | |
f27201da DW |
1150 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
1151 | oldset = ¤t->saved_sigmask; | |
1152 | else if (!oldset) | |
1da177e4 LT |
1153 | oldset = ¤t->blocked; |
1154 | ||
1da177e4 | 1155 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
81e7009e SR |
1156 | #ifdef CONFIG_PPC32 |
1157 | no_signal: | |
1158 | #endif | |
1da177e4 LT |
1159 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
1160 | && regs->ccr & 0x10000000 /* error signalled */ | |
1161 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
1162 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
1163 | || ret == ERESTART_RESTARTBLOCK)) { | |
1164 | ||
1165 | if (signr > 0 | |
1166 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
1167 | || (ret == ERESTARTSYS | |
1168 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
1169 | /* make the system call return an EINTR error */ | |
1170 | regs->result = -EINTR; | |
1171 | regs->gpr[3] = EINTR; | |
1172 | /* note that the cr0.SO bit is already set */ | |
1173 | } else { | |
1174 | regs->nip -= 4; /* Back up & retry system call */ | |
1175 | regs->result = 0; | |
1176 | regs->trap = 0; | |
1177 | if (ret == ERESTART_RESTARTBLOCK) | |
1178 | regs->gpr[0] = __NR_restart_syscall; | |
1179 | else | |
1180 | regs->gpr[3] = regs->orig_gpr3; | |
1181 | } | |
1182 | } | |
1183 | ||
f27201da DW |
1184 | if (signr == 0) { |
1185 | /* No signal to deliver -- put the saved sigmask back */ | |
1186 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1187 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1188 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1189 | } | |
1da177e4 | 1190 | return 0; /* no signals delivered */ |
f27201da | 1191 | } |
1da177e4 LT |
1192 | |
1193 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
81e7009e SR |
1194 | && !on_sig_stack(regs->gpr[1])) |
1195 | newsp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
1196 | else |
1197 | newsp = regs->gpr[1]; | |
1198 | newsp &= ~0xfUL; | |
1199 | ||
81e7009e | 1200 | #ifdef CONFIG_PPC64 |
fd9648df AB |
1201 | /* |
1202 | * Reenable the DABR before delivering the signal to | |
1203 | * user space. The DABR will have been cleared if it | |
1204 | * triggered inside the kernel. | |
1205 | */ | |
1206 | if (current->thread.dabr) | |
1207 | set_dabr(current->thread.dabr); | |
81e7009e | 1208 | #endif |
fd9648df | 1209 | |
1da177e4 LT |
1210 | /* Whee! Actually deliver the signal. */ |
1211 | if (ka.sa.sa_flags & SA_SIGINFO) | |
81e7009e | 1212 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1213 | else |
81e7009e | 1214 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1215 | |
69be8f18 | 1216 | if (ret) { |
1da177e4 LT |
1217 | spin_lock_irq(¤t->sighand->siglock); |
1218 | sigorsets(¤t->blocked, ¤t->blocked, | |
1219 | &ka.sa.sa_mask); | |
69be8f18 SR |
1220 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
1221 | sigaddset(¤t->blocked, signr); | |
1da177e4 LT |
1222 | recalc_sigpending(); |
1223 | spin_unlock_irq(¤t->sighand->siglock); | |
f27201da DW |
1224 | /* A signal was successfully delivered; the saved sigmask is in |
1225 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ | |
1226 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1227 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 LT |
1228 | } |
1229 | ||
1230 | return ret; | |
1231 | } |