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 | ||
20 | #include <linux/config.h> | |
21 | #include <linux/sched.h> | |
81e7009e | 22 | #include <linux/mm.h> |
1da177e4 LT |
23 | #include <linux/smp.h> |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/signal.h> | |
1da177e4 LT |
27 | #include <linux/errno.h> |
28 | #include <linux/elf.h> | |
81e7009e SR |
29 | #ifdef CONFIG_PPC64 |
30 | #include <linux/syscalls.h> | |
1da177e4 LT |
31 | #include <linux/compat.h> |
32 | #include <linux/ptrace.h> | |
81e7009e SR |
33 | #else |
34 | #include <linux/wait.h> | |
35 | #include <linux/ptrace.h> | |
36 | #include <linux/unistd.h> | |
37 | #include <linux/stddef.h> | |
38 | #include <linux/tty.h> | |
39 | #include <linux/binfmts.h> | |
40 | #include <linux/suspend.h> | |
41 | #endif | |
42 | ||
1da177e4 | 43 | #include <asm/uaccess.h> |
81e7009e | 44 | #include <asm/cacheflush.h> |
a7f31841 | 45 | #include <asm/syscalls.h> |
c5ff7001 | 46 | #include <asm/sigcontext.h> |
a7f290da | 47 | #include <asm/vdso.h> |
81e7009e | 48 | #ifdef CONFIG_PPC64 |
879168ee | 49 | #include "ppc32.h" |
1da177e4 | 50 | #include <asm/unistd.h> |
81e7009e SR |
51 | #else |
52 | #include <asm/ucontext.h> | |
53 | #include <asm/pgtable.h> | |
54 | #endif | |
1da177e4 | 55 | |
81e7009e | 56 | #undef DEBUG_SIG |
1da177e4 LT |
57 | |
58 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
59 | ||
81e7009e SR |
60 | #ifdef CONFIG_PPC64 |
61 | #define do_signal do_signal32 | |
b09a4913 SR |
62 | #define sys_sigsuspend compat_sys_sigsuspend |
63 | #define sys_rt_sigsuspend compat_sys_rt_sigsuspend | |
64 | #define sys_rt_sigreturn compat_sys_rt_sigreturn | |
65 | #define sys_sigaction compat_sys_sigaction | |
66 | #define sys_swapcontext compat_sys_swapcontext | |
67 | #define sys_sigreturn compat_sys_sigreturn | |
81e7009e SR |
68 | |
69 | #define old_sigaction old_sigaction32 | |
70 | #define sigcontext sigcontext32 | |
71 | #define mcontext mcontext32 | |
72 | #define ucontext ucontext32 | |
73 | ||
74 | /* | |
75 | * Returning 0 means we return to userspace via | |
76 | * ret_from_except and thus restore all user | |
77 | * registers from *regs. This is what we need | |
78 | * to do when a signal has been delivered. | |
79 | */ | |
81e7009e SR |
80 | |
81 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32)) | |
82 | #undef __SIGNAL_FRAMESIZE | |
83 | #define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32 | |
84 | #undef ELF_NVRREG | |
85 | #define ELF_NVRREG ELF_NVRREG32 | |
86 | ||
87 | /* | |
88 | * Functions for flipping sigsets (thanks to brain dead generic | |
89 | * implementation that makes things simple for little endian only) | |
90 | */ | |
91 | static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) | |
92 | { | |
93 | compat_sigset_t cset; | |
94 | ||
95 | switch (_NSIG_WORDS) { | |
96 | case 4: cset.sig[5] = set->sig[3] & 0xffffffffull; | |
97 | cset.sig[7] = set->sig[3] >> 32; | |
98 | case 3: cset.sig[4] = set->sig[2] & 0xffffffffull; | |
99 | cset.sig[5] = set->sig[2] >> 32; | |
100 | case 2: cset.sig[2] = set->sig[1] & 0xffffffffull; | |
101 | cset.sig[3] = set->sig[1] >> 32; | |
102 | case 1: cset.sig[0] = set->sig[0] & 0xffffffffull; | |
103 | cset.sig[1] = set->sig[0] >> 32; | |
104 | } | |
105 | return copy_to_user(uset, &cset, sizeof(*uset)); | |
106 | } | |
107 | ||
9b7cf8b4 PM |
108 | static inline int get_sigset_t(sigset_t *set, |
109 | const compat_sigset_t __user *uset) | |
81e7009e SR |
110 | { |
111 | compat_sigset_t s32; | |
112 | ||
113 | if (copy_from_user(&s32, uset, sizeof(*uset))) | |
114 | return -EFAULT; | |
115 | ||
116 | /* | |
117 | * Swap the 2 words of the 64-bit sigset_t (they are stored | |
118 | * in the "wrong" endian in 32-bit user storage). | |
119 | */ | |
120 | switch (_NSIG_WORDS) { | |
121 | case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); | |
122 | case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); | |
123 | case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); | |
124 | case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); | |
125 | } | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
130 | struct old_sigaction __user *act) | |
131 | { | |
132 | compat_old_sigset_t mask; | |
133 | compat_uptr_t handler, restorer; | |
134 | ||
135 | if (get_user(handler, &act->sa_handler) || | |
136 | __get_user(restorer, &act->sa_restorer) || | |
137 | __get_user(new_ka->sa.sa_flags, &act->sa_flags) || | |
138 | __get_user(mask, &act->sa_mask)) | |
139 | return -EFAULT; | |
140 | new_ka->sa.sa_handler = compat_ptr(handler); | |
141 | new_ka->sa.sa_restorer = compat_ptr(restorer); | |
142 | siginitset(&new_ka->sa.sa_mask, mask); | |
143 | return 0; | |
144 | } | |
145 | ||
29e646df | 146 | #define to_user_ptr(p) ptr_to_compat(p) |
81e7009e SR |
147 | #define from_user_ptr(p) compat_ptr(p) |
148 | ||
149 | static inline int save_general_regs(struct pt_regs *regs, | |
150 | struct mcontext __user *frame) | |
151 | { | |
152 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
153 | int i; | |
154 | ||
1bd79336 | 155 | WARN_ON(!FULL_REGS(regs)); |
401d1f02 DW |
156 | |
157 | for (i = 0; i <= PT_RESULT; i ++) { | |
158 | if (i == 14 && !FULL_REGS(regs)) | |
159 | i = 32; | |
81e7009e SR |
160 | if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i])) |
161 | return -EFAULT; | |
401d1f02 | 162 | } |
81e7009e SR |
163 | return 0; |
164 | } | |
165 | ||
166 | static inline int restore_general_regs(struct pt_regs *regs, | |
167 | struct mcontext __user *sr) | |
168 | { | |
169 | elf_greg_t64 *gregs = (elf_greg_t64 *)regs; | |
170 | int i; | |
171 | ||
172 | for (i = 0; i <= PT_RESULT; i++) { | |
173 | if ((i == PT_MSR) || (i == PT_SOFTE)) | |
174 | continue; | |
175 | if (__get_user(gregs[i], &sr->mc_gregs[i])) | |
176 | return -EFAULT; | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | #else /* CONFIG_PPC64 */ | |
182 | ||
81e7009e SR |
183 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
184 | ||
185 | static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set) | |
186 | { | |
187 | return copy_to_user(uset, set, sizeof(*uset)); | |
188 | } | |
189 | ||
9b7cf8b4 | 190 | static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset) |
81e7009e SR |
191 | { |
192 | return copy_from_user(set, uset, sizeof(*uset)); | |
193 | } | |
194 | ||
195 | static inline int get_old_sigaction(struct k_sigaction *new_ka, | |
196 | struct old_sigaction __user *act) | |
197 | { | |
198 | old_sigset_t mask; | |
199 | ||
200 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
201 | __get_user(new_ka->sa.sa_handler, &act->sa_handler) || | |
202 | __get_user(new_ka->sa.sa_restorer, &act->sa_restorer)) | |
203 | return -EFAULT; | |
204 | __get_user(new_ka->sa.sa_flags, &act->sa_flags); | |
205 | __get_user(mask, &act->sa_mask); | |
206 | siginitset(&new_ka->sa.sa_mask, mask); | |
207 | return 0; | |
208 | } | |
209 | ||
29e646df AV |
210 | #define to_user_ptr(p) ((unsigned long)(p)) |
211 | #define from_user_ptr(p) ((void __user *)(p)) | |
81e7009e SR |
212 | |
213 | static inline int save_general_regs(struct pt_regs *regs, | |
214 | struct mcontext __user *frame) | |
215 | { | |
1bd79336 | 216 | WARN_ON(!FULL_REGS(regs)); |
81e7009e SR |
217 | return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE); |
218 | } | |
219 | ||
220 | static inline int restore_general_regs(struct pt_regs *regs, | |
221 | struct mcontext __user *sr) | |
222 | { | |
223 | /* copy up to but not including MSR */ | |
224 | if (__copy_from_user(regs, &sr->mc_gregs, | |
225 | PT_MSR * sizeof(elf_greg_t))) | |
226 | return -EFAULT; | |
227 | /* copy from orig_r3 (the word after the MSR) up to the end */ | |
228 | if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3], | |
229 | GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t))) | |
230 | return -EFAULT; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | #endif /* CONFIG_PPC64 */ | |
235 | ||
236 | int do_signal(sigset_t *oldset, struct pt_regs *regs); | |
237 | ||
238 | /* | |
239 | * Atomically swap in the new signal mask, and wait for a signal. | |
240 | */ | |
150256d8 | 241 | long sys_sigsuspend(old_sigset_t mask) |
81e7009e | 242 | { |
81e7009e SR |
243 | mask &= _BLOCKABLE; |
244 | spin_lock_irq(¤t->sighand->siglock); | |
4a41cdf9 | 245 | current->saved_sigmask = current->blocked; |
81e7009e SR |
246 | siginitset(¤t->blocked, mask); |
247 | recalc_sigpending(); | |
248 | spin_unlock_irq(¤t->sighand->siglock); | |
249 | ||
150256d8 DW |
250 | current->state = TASK_INTERRUPTIBLE; |
251 | schedule(); | |
252 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
253 | return -ERESTARTNOHAND; | |
81e7009e SR |
254 | } |
255 | ||
256 | #ifdef CONFIG_PPC32 | |
257 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5, | |
258 | int r6, int r7, int r8, struct pt_regs *regs) | |
259 | { | |
260 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
261 | } | |
262 | #endif | |
263 | ||
264 | long sys_sigaction(int sig, struct old_sigaction __user *act, | |
265 | struct old_sigaction __user *oact) | |
266 | { | |
267 | struct k_sigaction new_ka, old_ka; | |
268 | int ret; | |
269 | ||
270 | #ifdef CONFIG_PPC64 | |
271 | if (sig < 0) | |
272 | sig = -sig; | |
273 | #endif | |
274 | ||
275 | if (act) { | |
276 | if (get_old_sigaction(&new_ka, act)) | |
277 | return -EFAULT; | |
278 | } | |
279 | ||
280 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
281 | if (!ret && oact) { | |
282 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
283 | __put_user(to_user_ptr(old_ka.sa.sa_handler), | |
284 | &oact->sa_handler) || | |
285 | __put_user(to_user_ptr(old_ka.sa.sa_restorer), | |
286 | &oact->sa_restorer) || | |
287 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || | |
288 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) | |
289 | return -EFAULT; | |
290 | } | |
291 | ||
292 | return ret; | |
293 | } | |
1da177e4 LT |
294 | |
295 | /* | |
296 | * When we have signals to deliver, we set up on the | |
297 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
298 | * a sigregs struct |
299 | * a sigcontext struct | |
300 | * a gap of __SIGNAL_FRAMESIZE bytes | |
1da177e4 LT |
301 | * |
302 | * Each of these things must be a multiple of 16 bytes in size. | |
303 | * | |
304 | */ | |
81e7009e SR |
305 | struct sigregs { |
306 | struct mcontext mctx; /* all the register values */ | |
1da177e4 LT |
307 | /* |
308 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
309 | * regs and 18 fp regs below sp before decrementing it. | |
310 | */ | |
311 | int abigap[56]; | |
312 | }; | |
313 | ||
314 | /* We use the mc_pad field for the signal return trampoline. */ | |
315 | #define tramp mc_pad | |
316 | ||
317 | /* | |
318 | * When we have rt signals to deliver, we set up on the | |
319 | * user stack, going down from the original stack pointer: | |
81e7009e SR |
320 | * one rt_sigframe struct (siginfo + ucontext + ABI gap) |
321 | * a gap of __SIGNAL_FRAMESIZE+16 bytes | |
322 | * (the +16 is to get the siginfo and ucontext in the same | |
1da177e4 LT |
323 | * positions as in older kernels). |
324 | * | |
325 | * Each of these things must be a multiple of 16 bytes in size. | |
326 | * | |
327 | */ | |
81e7009e SR |
328 | struct rt_sigframe { |
329 | #ifdef CONFIG_PPC64 | |
330 | compat_siginfo_t info; | |
331 | #else | |
332 | struct siginfo info; | |
333 | #endif | |
334 | struct ucontext uc; | |
1da177e4 LT |
335 | /* |
336 | * Programs using the rs6000/xcoff abi can save up to 19 gp | |
337 | * regs and 18 fp regs below sp before decrementing it. | |
338 | */ | |
339 | int abigap[56]; | |
340 | }; | |
341 | ||
1da177e4 LT |
342 | /* |
343 | * Save the current user registers on the user stack. | |
81e7009e SR |
344 | * We only save the altivec/spe registers if the process has used |
345 | * altivec/spe instructions at some point. | |
1da177e4 | 346 | */ |
81e7009e SR |
347 | static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame, |
348 | int sigret) | |
1da177e4 | 349 | { |
1da177e4 LT |
350 | /* Make sure floating point registers are stored in regs */ |
351 | flush_fp_to_thread(current); | |
352 | ||
353 | /* save general and floating-point registers */ | |
81e7009e SR |
354 | if (save_general_regs(regs, frame) || |
355 | __copy_to_user(&frame->mc_fregs, current->thread.fpr, | |
356 | ELF_NFPREG * sizeof(double))) | |
1da177e4 LT |
357 | return 1; |
358 | ||
1da177e4 LT |
359 | #ifdef CONFIG_ALTIVEC |
360 | /* save altivec registers */ | |
361 | if (current->thread.used_vr) { | |
362 | flush_altivec_to_thread(current); | |
363 | if (__copy_to_user(&frame->mc_vregs, current->thread.vr, | |
81e7009e | 364 | ELF_NVRREG * sizeof(vector128))) |
1da177e4 LT |
365 | return 1; |
366 | /* set MSR_VEC in the saved MSR value to indicate that | |
367 | frame->mc_vregs contains valid data */ | |
368 | if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR])) | |
369 | return 1; | |
370 | } | |
371 | /* else assert((regs->msr & MSR_VEC) == 0) */ | |
372 | ||
373 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
374 | * use altivec. Since VSCR only contains 32 bits saved in the least | |
375 | * significant bits of a vector, we "cheat" and stuff VRSAVE in the | |
376 | * most significant bits of that same vector. --BenH | |
377 | */ | |
378 | if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32])) | |
379 | return 1; | |
380 | #endif /* CONFIG_ALTIVEC */ | |
381 | ||
81e7009e SR |
382 | #ifdef CONFIG_SPE |
383 | /* save spe registers */ | |
384 | if (current->thread.used_spe) { | |
385 | flush_spe_to_thread(current); | |
386 | if (__copy_to_user(&frame->mc_vregs, current->thread.evr, | |
387 | ELF_NEVRREG * sizeof(u32))) | |
388 | return 1; | |
389 | /* set MSR_SPE in the saved MSR value to indicate that | |
390 | frame->mc_vregs contains valid data */ | |
391 | if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR])) | |
392 | return 1; | |
393 | } | |
394 | /* else assert((regs->msr & MSR_SPE) == 0) */ | |
395 | ||
396 | /* We always copy to/from spefscr */ | |
397 | if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG)) | |
398 | return 1; | |
399 | #endif /* CONFIG_SPE */ | |
400 | ||
1da177e4 LT |
401 | if (sigret) { |
402 | /* Set up the sigreturn trampoline: li r0,sigret; sc */ | |
403 | if (__put_user(0x38000000UL + sigret, &frame->tramp[0]) | |
404 | || __put_user(0x44000002UL, &frame->tramp[1])) | |
405 | return 1; | |
406 | flush_icache_range((unsigned long) &frame->tramp[0], | |
407 | (unsigned long) &frame->tramp[2]); | |
408 | } | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | /* | |
414 | * Restore the current user register values from the user stack, | |
415 | * (except for MSR). | |
416 | */ | |
417 | static long restore_user_regs(struct pt_regs *regs, | |
81e7009e | 418 | struct mcontext __user *sr, int sig) |
1da177e4 | 419 | { |
81e7009e | 420 | long err; |
1da177e4 | 421 | unsigned int save_r2 = 0; |
81e7009e | 422 | #if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE) |
1da177e4 LT |
423 | unsigned long msr; |
424 | #endif | |
425 | ||
426 | /* | |
427 | * restore general registers but not including MSR or SOFTE. Also | |
428 | * take care of keeping r2 (TLS) intact if not a signal | |
429 | */ | |
430 | if (!sig) | |
431 | save_r2 = (unsigned int)regs->gpr[2]; | |
81e7009e | 432 | err = restore_general_regs(regs, sr); |
1da177e4 LT |
433 | if (!sig) |
434 | regs->gpr[2] = (unsigned long) save_r2; | |
435 | if (err) | |
436 | return 1; | |
437 | ||
5388fb10 PM |
438 | /* |
439 | * Do this before updating the thread state in | |
440 | * current->thread.fpr/vr/evr. That way, if we get preempted | |
441 | * and another task grabs the FPU/Altivec/SPE, it won't be | |
442 | * tempted to save the current CPU state into the thread_struct | |
443 | * and corrupt what we are writing there. | |
444 | */ | |
445 | discard_lazy_cpu_state(); | |
446 | ||
1da177e4 LT |
447 | /* force the process to reload the FP registers from |
448 | current->thread when it next does FP instructions */ | |
449 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1); | |
450 | if (__copy_from_user(current->thread.fpr, &sr->mc_fregs, | |
451 | sizeof(sr->mc_fregs))) | |
452 | return 1; | |
453 | ||
454 | #ifdef CONFIG_ALTIVEC | |
455 | /* force the process to reload the altivec registers from | |
456 | current->thread when it next does altivec instructions */ | |
457 | regs->msr &= ~MSR_VEC; | |
458 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { | |
459 | /* restore altivec registers from the stack */ | |
460 | if (__copy_from_user(current->thread.vr, &sr->mc_vregs, | |
461 | sizeof(sr->mc_vregs))) | |
462 | return 1; | |
463 | } else if (current->thread.used_vr) | |
81e7009e | 464 | memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128)); |
1da177e4 LT |
465 | |
466 | /* Always get VRSAVE back */ | |
467 | if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32])) | |
468 | return 1; | |
469 | #endif /* CONFIG_ALTIVEC */ | |
470 | ||
81e7009e SR |
471 | #ifdef CONFIG_SPE |
472 | /* force the process to reload the spe registers from | |
473 | current->thread when it next does spe instructions */ | |
474 | regs->msr &= ~MSR_SPE; | |
475 | if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) { | |
476 | /* restore spe registers from the stack */ | |
477 | if (__copy_from_user(current->thread.evr, &sr->mc_vregs, | |
478 | ELF_NEVRREG * sizeof(u32))) | |
479 | return 1; | |
480 | } else if (current->thread.used_spe) | |
481 | memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32)); | |
482 | ||
483 | /* Always get SPEFSCR back */ | |
484 | if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG)) | |
485 | return 1; | |
486 | #endif /* CONFIG_SPE */ | |
487 | ||
1da177e4 LT |
488 | return 0; |
489 | } | |
490 | ||
81e7009e | 491 | #ifdef CONFIG_PPC64 |
b09a4913 | 492 | long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act, |
1da177e4 LT |
493 | struct sigaction32 __user *oact, size_t sigsetsize) |
494 | { | |
495 | struct k_sigaction new_ka, old_ka; | |
496 | int ret; | |
1da177e4 LT |
497 | |
498 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
499 | if (sigsetsize != sizeof(compat_sigset_t)) | |
500 | return -EINVAL; | |
501 | ||
502 | if (act) { | |
503 | compat_uptr_t handler; | |
504 | ||
505 | ret = get_user(handler, &act->sa_handler); | |
506 | new_ka.sa.sa_handler = compat_ptr(handler); | |
81e7009e | 507 | ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); |
1da177e4 LT |
508 | ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
509 | if (ret) | |
510 | return -EFAULT; | |
511 | } | |
512 | ||
513 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
514 | if (!ret && oact) { | |
29e646df | 515 | ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler); |
81e7009e | 516 | ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); |
1da177e4 LT |
517 | ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
518 | } | |
519 | return ret; | |
520 | } | |
521 | ||
522 | /* | |
523 | * Note: it is necessary to treat how as an unsigned int, with the | |
524 | * corresponding cast to a signed int to insure that the proper | |
525 | * conversion (sign extension) between the register representation | |
526 | * of a signed int (msr in 32-bit mode) and the register representation | |
527 | * of a signed int (msr in 64-bit mode) is performed. | |
528 | */ | |
b09a4913 | 529 | long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set, |
1da177e4 LT |
530 | compat_sigset_t __user *oset, size_t sigsetsize) |
531 | { | |
532 | sigset_t s; | |
533 | sigset_t __user *up; | |
1da177e4 LT |
534 | int ret; |
535 | mm_segment_t old_fs = get_fs(); | |
536 | ||
537 | if (set) { | |
81e7009e SR |
538 | if (get_sigset_t(&s, set)) |
539 | return -EFAULT; | |
1da177e4 | 540 | } |
81e7009e | 541 | |
1da177e4 LT |
542 | set_fs(KERNEL_DS); |
543 | /* This is valid because of the set_fs() */ | |
544 | up = (sigset_t __user *) &s; | |
545 | ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL, | |
81e7009e | 546 | sigsetsize); |
1da177e4 LT |
547 | set_fs(old_fs); |
548 | if (ret) | |
549 | return ret; | |
550 | if (oset) { | |
81e7009e | 551 | if (put_sigset_t(oset, &s)) |
1da177e4 LT |
552 | return -EFAULT; |
553 | } | |
554 | return 0; | |
555 | } | |
556 | ||
b09a4913 | 557 | long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize) |
1da177e4 LT |
558 | { |
559 | sigset_t s; | |
1da177e4 LT |
560 | int ret; |
561 | mm_segment_t old_fs = get_fs(); | |
562 | ||
563 | set_fs(KERNEL_DS); | |
564 | /* The __user pointer cast is valid because of the set_fs() */ | |
565 | ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); | |
566 | set_fs(old_fs); | |
567 | if (!ret) { | |
81e7009e | 568 | if (put_sigset_t(set, &s)) |
1da177e4 LT |
569 | return -EFAULT; |
570 | } | |
571 | return ret; | |
572 | } | |
573 | ||
574 | ||
575 | int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) | |
576 | { | |
577 | int err; | |
578 | ||
579 | if (!access_ok (VERIFY_WRITE, d, sizeof(*d))) | |
580 | return -EFAULT; | |
581 | ||
582 | /* If you change siginfo_t structure, please be sure | |
583 | * this code is fixed accordingly. | |
584 | * It should never copy any pad contained in the structure | |
585 | * to avoid security leaks, but must copy the generic | |
586 | * 3 ints plus the relevant union member. | |
587 | * This routine must convert siginfo from 64bit to 32bit as well | |
588 | * at the same time. | |
589 | */ | |
590 | err = __put_user(s->si_signo, &d->si_signo); | |
591 | err |= __put_user(s->si_errno, &d->si_errno); | |
592 | err |= __put_user((short)s->si_code, &d->si_code); | |
593 | if (s->si_code < 0) | |
594 | err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad, | |
595 | SI_PAD_SIZE32); | |
596 | else switch(s->si_code >> 16) { | |
597 | case __SI_CHLD >> 16: | |
598 | err |= __put_user(s->si_pid, &d->si_pid); | |
599 | err |= __put_user(s->si_uid, &d->si_uid); | |
600 | err |= __put_user(s->si_utime, &d->si_utime); | |
601 | err |= __put_user(s->si_stime, &d->si_stime); | |
602 | err |= __put_user(s->si_status, &d->si_status); | |
603 | break; | |
604 | case __SI_FAULT >> 16: | |
605 | err |= __put_user((unsigned int)(unsigned long)s->si_addr, | |
606 | &d->si_addr); | |
607 | break; | |
608 | case __SI_POLL >> 16: | |
609 | err |= __put_user(s->si_band, &d->si_band); | |
610 | err |= __put_user(s->si_fd, &d->si_fd); | |
611 | break; | |
612 | case __SI_TIMER >> 16: | |
613 | err |= __put_user(s->si_tid, &d->si_tid); | |
614 | err |= __put_user(s->si_overrun, &d->si_overrun); | |
615 | err |= __put_user(s->si_int, &d->si_int); | |
616 | break; | |
617 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
618 | case __SI_MESGQ >> 16: | |
619 | err |= __put_user(s->si_int, &d->si_int); | |
620 | /* fallthrough */ | |
621 | case __SI_KILL >> 16: | |
622 | default: | |
623 | err |= __put_user(s->si_pid, &d->si_pid); | |
624 | err |= __put_user(s->si_uid, &d->si_uid); | |
625 | break; | |
626 | } | |
627 | return err; | |
628 | } | |
629 | ||
81e7009e SR |
630 | #define copy_siginfo_to_user copy_siginfo_to_user32 |
631 | ||
1da177e4 LT |
632 | /* |
633 | * Note: it is necessary to treat pid and sig as unsigned ints, with the | |
634 | * corresponding cast to a signed int to insure that the proper conversion | |
635 | * (sign extension) between the register representation of a signed int | |
636 | * (msr in 32-bit mode) and the register representation of a signed int | |
637 | * (msr in 64-bit mode) is performed. | |
638 | */ | |
b09a4913 | 639 | long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo) |
1da177e4 LT |
640 | { |
641 | siginfo_t info; | |
642 | int ret; | |
643 | mm_segment_t old_fs = get_fs(); | |
81e7009e | 644 | |
1da177e4 LT |
645 | if (copy_from_user (&info, uinfo, 3*sizeof(int)) || |
646 | copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32)) | |
647 | return -EFAULT; | |
648 | set_fs (KERNEL_DS); | |
649 | /* The __user pointer cast is valid becasuse of the set_fs() */ | |
650 | ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info); | |
651 | set_fs (old_fs); | |
652 | return ret; | |
653 | } | |
1da177e4 LT |
654 | /* |
655 | * Start Alternate signal stack support | |
656 | * | |
657 | * System Calls | |
b09a4913 | 658 | * sigaltatck compat_sys_sigaltstack |
1da177e4 LT |
659 | */ |
660 | ||
b09a4913 | 661 | int compat_sys_sigaltstack(u32 __new, u32 __old, int r5, |
1da177e4 LT |
662 | int r6, int r7, int r8, struct pt_regs *regs) |
663 | { | |
29e646df AV |
664 | stack_32_t __user * newstack = compat_ptr(__new); |
665 | stack_32_t __user * oldstack = compat_ptr(__old); | |
1da177e4 LT |
666 | stack_t uss, uoss; |
667 | int ret; | |
668 | mm_segment_t old_fs; | |
669 | unsigned long sp; | |
670 | compat_uptr_t ss_sp; | |
671 | ||
672 | /* | |
673 | * set sp to the user stack on entry to the system call | |
674 | * the system call router sets R9 to the saved registers | |
675 | */ | |
676 | sp = regs->gpr[1]; | |
677 | ||
678 | /* Put new stack info in local 64 bit stack struct */ | |
679 | if (newstack) { | |
680 | if (get_user(ss_sp, &newstack->ss_sp) || | |
681 | __get_user(uss.ss_flags, &newstack->ss_flags) || | |
682 | __get_user(uss.ss_size, &newstack->ss_size)) | |
683 | return -EFAULT; | |
684 | uss.ss_sp = compat_ptr(ss_sp); | |
685 | } | |
686 | ||
687 | old_fs = get_fs(); | |
688 | set_fs(KERNEL_DS); | |
689 | /* The __user pointer casts are valid because of the set_fs() */ | |
690 | ret = do_sigaltstack( | |
691 | newstack ? (stack_t __user *) &uss : NULL, | |
692 | oldstack ? (stack_t __user *) &uoss : NULL, | |
693 | sp); | |
694 | set_fs(old_fs); | |
695 | /* Copy the stack information to the user output buffer */ | |
696 | if (!ret && oldstack && | |
29e646df | 697 | (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || |
1da177e4 LT |
698 | __put_user(uoss.ss_flags, &oldstack->ss_flags) || |
699 | __put_user(uoss.ss_size, &oldstack->ss_size))) | |
700 | return -EFAULT; | |
701 | return ret; | |
702 | } | |
81e7009e | 703 | #endif /* CONFIG_PPC64 */ |
1da177e4 LT |
704 | |
705 | ||
81e7009e SR |
706 | /* |
707 | * Restore the user process's signal mask | |
708 | */ | |
709 | #ifdef CONFIG_PPC64 | |
710 | extern void restore_sigmask(sigset_t *set); | |
711 | #else /* CONFIG_PPC64 */ | |
712 | static void restore_sigmask(sigset_t *set) | |
713 | { | |
714 | sigdelsetmask(set, ~_BLOCKABLE); | |
715 | spin_lock_irq(¤t->sighand->siglock); | |
716 | current->blocked = *set; | |
717 | recalc_sigpending(); | |
718 | spin_unlock_irq(¤t->sighand->siglock); | |
719 | } | |
720 | #endif | |
721 | ||
1da177e4 LT |
722 | /* |
723 | * Set up a signal frame for a "real-time" signal handler | |
724 | * (one which gets siginfo). | |
725 | */ | |
81e7009e SR |
726 | static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, |
727 | siginfo_t *info, sigset_t *oldset, | |
728 | struct pt_regs *regs, unsigned long newsp) | |
1da177e4 | 729 | { |
81e7009e SR |
730 | struct rt_sigframe __user *rt_sf; |
731 | struct mcontext __user *frame; | |
1da177e4 | 732 | unsigned long origsp = newsp; |
1da177e4 LT |
733 | |
734 | /* Set up Signal Frame */ | |
735 | /* Put a Real Time Context onto stack */ | |
736 | newsp -= sizeof(*rt_sf); | |
81e7009e | 737 | rt_sf = (struct rt_sigframe __user *)newsp; |
1da177e4 LT |
738 | |
739 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 740 | newsp -= __SIGNAL_FRAMESIZE + 16; |
1da177e4 LT |
741 | |
742 | if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp)) | |
743 | goto badframe; | |
744 | ||
1da177e4 | 745 | /* Put the siginfo & fill in most of the ucontext */ |
81e7009e | 746 | if (copy_siginfo_to_user(&rt_sf->info, info) |
1da177e4 LT |
747 | || __put_user(0, &rt_sf->uc.uc_flags) |
748 | || __put_user(0, &rt_sf->uc.uc_link) | |
749 | || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp) | |
750 | || __put_user(sas_ss_flags(regs->gpr[1]), | |
751 | &rt_sf->uc.uc_stack.ss_flags) | |
752 | || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size) | |
81e7009e SR |
753 | || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext), |
754 | &rt_sf->uc.uc_regs) | |
755 | || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset)) | |
1da177e4 LT |
756 | goto badframe; |
757 | ||
758 | /* Save user registers on the stack */ | |
759 | frame = &rt_sf->uc.uc_mcontext; | |
1da177e4 LT |
760 | if (vdso32_rt_sigtramp && current->thread.vdso_base) { |
761 | if (save_user_regs(regs, frame, 0)) | |
762 | goto badframe; | |
763 | regs->link = current->thread.vdso_base + vdso32_rt_sigtramp; | |
a7f290da | 764 | } else { |
1da177e4 LT |
765 | if (save_user_regs(regs, frame, __NR_rt_sigreturn)) |
766 | goto badframe; | |
767 | regs->link = (unsigned long) frame->tramp; | |
768 | } | |
cc657f53 PM |
769 | |
770 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ | |
771 | ||
e2b55306 | 772 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
81e7009e SR |
773 | goto badframe; |
774 | regs->gpr[1] = newsp; | |
1da177e4 LT |
775 | regs->gpr[3] = sig; |
776 | regs->gpr[4] = (unsigned long) &rt_sf->info; | |
777 | regs->gpr[5] = (unsigned long) &rt_sf->uc; | |
778 | regs->gpr[6] = (unsigned long) rt_sf; | |
779 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
780 | regs->trap = 0; | |
1da177e4 LT |
781 | return 1; |
782 | ||
783 | badframe: | |
81e7009e | 784 | #ifdef DEBUG_SIG |
1da177e4 LT |
785 | printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n", |
786 | regs, frame, newsp); | |
787 | #endif | |
788 | force_sigsegv(sig, current); | |
789 | return 0; | |
790 | } | |
791 | ||
81e7009e | 792 | static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig) |
1da177e4 | 793 | { |
1da177e4 | 794 | sigset_t set; |
81e7009e SR |
795 | struct mcontext __user *mcp; |
796 | ||
797 | if (get_sigset_t(&set, &ucp->uc_sigmask)) | |
798 | return -EFAULT; | |
799 | #ifdef CONFIG_PPC64 | |
800 | { | |
801 | u32 cmcp; | |
1da177e4 | 802 | |
81e7009e SR |
803 | if (__get_user(cmcp, &ucp->uc_regs)) |
804 | return -EFAULT; | |
805 | mcp = (struct mcontext __user *)(u64)cmcp; | |
806 | } | |
807 | #else | |
808 | if (__get_user(mcp, &ucp->uc_regs)) | |
1da177e4 | 809 | return -EFAULT; |
81e7009e | 810 | #endif |
1da177e4 | 811 | restore_sigmask(&set); |
81e7009e | 812 | if (restore_user_regs(regs, mcp, sig)) |
1da177e4 LT |
813 | return -EFAULT; |
814 | ||
815 | return 0; | |
816 | } | |
817 | ||
81e7009e | 818 | long sys_swapcontext(struct ucontext __user *old_ctx, |
1bd79336 PM |
819 | struct ucontext __user *new_ctx, |
820 | int ctx_size, int r6, int r7, int r8, struct pt_regs *regs) | |
1da177e4 LT |
821 | { |
822 | unsigned char tmp; | |
1da177e4 LT |
823 | |
824 | /* Context size is for future use. Right now, we only make sure | |
825 | * we are passed something we understand | |
826 | */ | |
81e7009e | 827 | if (ctx_size < sizeof(struct ucontext)) |
1da177e4 LT |
828 | return -EINVAL; |
829 | ||
830 | if (old_ctx != NULL) { | |
1da177e4 LT |
831 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) |
832 | || save_user_regs(regs, &old_ctx->uc_mcontext, 0) | |
81e7009e SR |
833 | || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) |
834 | || __put_user(to_user_ptr(&old_ctx->uc_mcontext), | |
835 | &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: | |
899 | force_sig(SIGSEGV, current); | |
900 | return 0; | |
901 | } | |
902 | ||
81e7009e SR |
903 | #ifdef CONFIG_PPC32 |
904 | int sys_debug_setcontext(struct ucontext __user *ctx, | |
905 | int ndbg, struct sig_dbg_op __user *dbg, | |
906 | int r6, int r7, int r8, | |
907 | struct pt_regs *regs) | |
908 | { | |
909 | struct sig_dbg_op op; | |
910 | int i; | |
911 | unsigned long new_msr = regs->msr; | |
912 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
913 | unsigned long new_dbcr0 = current->thread.dbcr0; | |
914 | #endif | |
915 | ||
916 | for (i=0; i<ndbg; i++) { | |
917 | if (__copy_from_user(&op, dbg, sizeof(op))) | |
918 | return -EFAULT; | |
919 | switch (op.dbg_type) { | |
920 | case SIG_DBG_SINGLE_STEPPING: | |
921 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
922 | if (op.dbg_value) { | |
923 | new_msr |= MSR_DE; | |
924 | new_dbcr0 |= (DBCR0_IDM | DBCR0_IC); | |
925 | } else { | |
926 | new_msr &= ~MSR_DE; | |
927 | new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC); | |
928 | } | |
929 | #else | |
930 | if (op.dbg_value) | |
931 | new_msr |= MSR_SE; | |
932 | else | |
933 | new_msr &= ~MSR_SE; | |
934 | #endif | |
935 | break; | |
936 | case SIG_DBG_BRANCH_TRACING: | |
937 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
938 | return -EINVAL; | |
939 | #else | |
940 | if (op.dbg_value) | |
941 | new_msr |= MSR_BE; | |
942 | else | |
943 | new_msr &= ~MSR_BE; | |
944 | #endif | |
945 | break; | |
946 | ||
947 | default: | |
948 | return -EINVAL; | |
949 | } | |
950 | } | |
951 | ||
952 | /* We wait until here to actually install the values in the | |
953 | registers so if we fail in the above loop, it will not | |
954 | affect the contents of these registers. After this point, | |
955 | failure is a problem, anyway, and it's very unlikely unless | |
956 | the user is really doing something wrong. */ | |
957 | regs->msr = new_msr; | |
958 | #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) | |
959 | current->thread.dbcr0 = new_dbcr0; | |
960 | #endif | |
961 | ||
962 | /* | |
963 | * If we get a fault copying the context into the kernel's | |
964 | * image of the user's registers, we can't just return -EFAULT | |
965 | * because the user's registers will be corrupted. For instance | |
966 | * the NIP value may have been updated but not some of the | |
967 | * other registers. Given that we have done the access_ok | |
968 | * and successfully read the first and last bytes of the region | |
969 | * above, this should only happen in an out-of-memory situation | |
970 | * or if another thread unmaps the region containing the context. | |
971 | * We kill the task with a SIGSEGV in this situation. | |
972 | */ | |
973 | if (do_setcontext(ctx, regs, 1)) { | |
974 | force_sig(SIGSEGV, current); | |
975 | goto out; | |
976 | } | |
977 | ||
978 | /* | |
979 | * It's not clear whether or why it is desirable to save the | |
980 | * sigaltstack setting on signal delivery and restore it on | |
981 | * signal return. But other architectures do this and we have | |
982 | * always done it up until now so it is probably better not to | |
983 | * change it. -- paulus | |
984 | */ | |
985 | do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]); | |
986 | ||
401d1f02 | 987 | set_thread_flag(TIF_RESTOREALL); |
81e7009e SR |
988 | out: |
989 | return 0; | |
990 | } | |
991 | #endif | |
1da177e4 LT |
992 | |
993 | /* | |
994 | * OK, we're invoking a handler | |
995 | */ | |
81e7009e SR |
996 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, |
997 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs, | |
998 | unsigned long newsp) | |
1da177e4 | 999 | { |
81e7009e SR |
1000 | struct sigcontext __user *sc; |
1001 | struct sigregs __user *frame; | |
1da177e4 LT |
1002 | unsigned long origsp = newsp; |
1003 | ||
1004 | /* Set up Signal Frame */ | |
81e7009e SR |
1005 | newsp -= sizeof(struct sigregs); |
1006 | frame = (struct sigregs __user *) newsp; | |
1da177e4 LT |
1007 | |
1008 | /* Put a sigcontext on the stack */ | |
1009 | newsp -= sizeof(*sc); | |
81e7009e | 1010 | sc = (struct sigcontext __user *) newsp; |
1da177e4 LT |
1011 | |
1012 | /* create a stack frame for the caller of the handler */ | |
81e7009e | 1013 | newsp -= __SIGNAL_FRAMESIZE; |
1da177e4 LT |
1014 | |
1015 | if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp)) | |
1016 | goto badframe; | |
1017 | ||
1018 | #if _NSIG != 64 | |
81e7009e | 1019 | #error "Please adjust handle_signal()" |
1da177e4 | 1020 | #endif |
81e7009e | 1021 | if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler) |
1da177e4 | 1022 | || __put_user(oldset->sig[0], &sc->oldmask) |
81e7009e | 1023 | #ifdef CONFIG_PPC64 |
1da177e4 | 1024 | || __put_user((oldset->sig[0] >> 32), &sc->_unused[3]) |
81e7009e SR |
1025 | #else |
1026 | || __put_user(oldset->sig[1], &sc->_unused[3]) | |
1027 | #endif | |
1028 | || __put_user(to_user_ptr(frame), &sc->regs) | |
1da177e4 LT |
1029 | || __put_user(sig, &sc->signal)) |
1030 | goto badframe; | |
1031 | ||
1032 | if (vdso32_sigtramp && current->thread.vdso_base) { | |
1033 | if (save_user_regs(regs, &frame->mctx, 0)) | |
1034 | goto badframe; | |
1035 | regs->link = current->thread.vdso_base + vdso32_sigtramp; | |
a7f290da | 1036 | } else { |
1da177e4 LT |
1037 | if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) |
1038 | goto badframe; | |
1039 | regs->link = (unsigned long) frame->mctx.tramp; | |
1040 | } | |
1041 | ||
cc657f53 PM |
1042 | current->thread.fpscr.val = 0; /* turn off all fp exceptions */ |
1043 | ||
9747dd6f | 1044 | if (put_user(regs->gpr[1], (u32 __user *)newsp)) |
1da177e4 | 1045 | goto badframe; |
81e7009e | 1046 | regs->gpr[1] = newsp; |
1da177e4 LT |
1047 | regs->gpr[3] = sig; |
1048 | regs->gpr[4] = (unsigned long) sc; | |
1049 | regs->nip = (unsigned long) ka->sa.sa_handler; | |
1050 | regs->trap = 0; | |
1da177e4 LT |
1051 | |
1052 | return 1; | |
1053 | ||
1054 | badframe: | |
81e7009e SR |
1055 | #ifdef DEBUG_SIG |
1056 | printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n", | |
1057 | regs, frame, newsp); | |
1da177e4 LT |
1058 | #endif |
1059 | force_sigsegv(sig, current); | |
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * Do a signal return; undo the signal stack. | |
1065 | */ | |
81e7009e | 1066 | long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8, |
1da177e4 LT |
1067 | struct pt_regs *regs) |
1068 | { | |
81e7009e SR |
1069 | struct sigcontext __user *sc; |
1070 | struct sigcontext sigctx; | |
1071 | struct mcontext __user *sr; | |
1da177e4 | 1072 | sigset_t set; |
1da177e4 LT |
1073 | |
1074 | /* Always make any pending restarted system calls return -EINTR */ | |
1075 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
1076 | ||
81e7009e | 1077 | sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE); |
1da177e4 LT |
1078 | if (copy_from_user(&sigctx, sc, sizeof(sigctx))) |
1079 | goto badframe; | |
1080 | ||
81e7009e | 1081 | #ifdef CONFIG_PPC64 |
1da177e4 LT |
1082 | /* |
1083 | * Note that PPC32 puts the upper 32 bits of the sigmask in the | |
1084 | * unused part of the signal stackframe | |
1085 | */ | |
1086 | set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32); | |
81e7009e SR |
1087 | #else |
1088 | set.sig[0] = sigctx.oldmask; | |
1089 | set.sig[1] = sigctx._unused[3]; | |
1090 | #endif | |
1da177e4 LT |
1091 | restore_sigmask(&set); |
1092 | ||
81e7009e | 1093 | sr = (struct mcontext __user *)from_user_ptr(sigctx.regs); |
1da177e4 LT |
1094 | if (!access_ok(VERIFY_READ, sr, sizeof(*sr)) |
1095 | || restore_user_regs(regs, sr, 1)) | |
1096 | goto badframe; | |
1097 | ||
401d1f02 | 1098 | set_thread_flag(TIF_RESTOREALL); |
81e7009e | 1099 | return 0; |
1da177e4 LT |
1100 | |
1101 | badframe: | |
1102 | force_sig(SIGSEGV, current); | |
1103 | return 0; | |
1104 | } | |
1105 | ||
1da177e4 LT |
1106 | /* |
1107 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
1108 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
1109 | * mistake. | |
1110 | */ | |
81e7009e | 1111 | int do_signal(sigset_t *oldset, struct pt_regs *regs) |
1da177e4 LT |
1112 | { |
1113 | siginfo_t info; | |
81e7009e | 1114 | struct k_sigaction ka; |
f27201da | 1115 | unsigned int newsp; |
1da177e4 | 1116 | int signr, ret; |
81e7009e SR |
1117 | |
1118 | #ifdef CONFIG_PPC32 | |
1119 | if (try_to_freeze()) { | |
1120 | signr = 0; | |
1121 | if (!signal_pending(current)) | |
1122 | goto no_signal; | |
1123 | } | |
1124 | #endif | |
1da177e4 | 1125 | |
f27201da DW |
1126 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
1127 | oldset = ¤t->saved_sigmask; | |
1128 | else if (!oldset) | |
1da177e4 LT |
1129 | oldset = ¤t->blocked; |
1130 | ||
1da177e4 | 1131 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
81e7009e SR |
1132 | #ifdef CONFIG_PPC32 |
1133 | no_signal: | |
1134 | #endif | |
1da177e4 LT |
1135 | if (TRAP(regs) == 0x0C00 /* System Call! */ |
1136 | && regs->ccr & 0x10000000 /* error signalled */ | |
1137 | && ((ret = regs->gpr[3]) == ERESTARTSYS | |
1138 | || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR | |
1139 | || ret == ERESTART_RESTARTBLOCK)) { | |
1140 | ||
1141 | if (signr > 0 | |
1142 | && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK | |
1143 | || (ret == ERESTARTSYS | |
1144 | && !(ka.sa.sa_flags & SA_RESTART)))) { | |
1145 | /* make the system call return an EINTR error */ | |
1146 | regs->result = -EINTR; | |
1147 | regs->gpr[3] = EINTR; | |
1148 | /* note that the cr0.SO bit is already set */ | |
1149 | } else { | |
1150 | regs->nip -= 4; /* Back up & retry system call */ | |
1151 | regs->result = 0; | |
1152 | regs->trap = 0; | |
1153 | if (ret == ERESTART_RESTARTBLOCK) | |
1154 | regs->gpr[0] = __NR_restart_syscall; | |
1155 | else | |
1156 | regs->gpr[3] = regs->orig_gpr3; | |
1157 | } | |
1158 | } | |
1159 | ||
f27201da DW |
1160 | if (signr == 0) { |
1161 | /* No signal to deliver -- put the saved sigmask back */ | |
1162 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
1163 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1164 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
1165 | } | |
1da177e4 | 1166 | return 0; /* no signals delivered */ |
f27201da | 1167 | } |
1da177e4 LT |
1168 | |
1169 | if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size | |
81e7009e SR |
1170 | && !on_sig_stack(regs->gpr[1])) |
1171 | newsp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
1172 | else |
1173 | newsp = regs->gpr[1]; | |
1174 | newsp &= ~0xfUL; | |
1175 | ||
81e7009e | 1176 | #ifdef CONFIG_PPC64 |
fd9648df AB |
1177 | /* |
1178 | * Reenable the DABR before delivering the signal to | |
1179 | * user space. The DABR will have been cleared if it | |
1180 | * triggered inside the kernel. | |
1181 | */ | |
1182 | if (current->thread.dabr) | |
1183 | set_dabr(current->thread.dabr); | |
81e7009e | 1184 | #endif |
fd9648df | 1185 | |
1da177e4 LT |
1186 | /* Whee! Actually deliver the signal. */ |
1187 | if (ka.sa.sa_flags & SA_SIGINFO) | |
81e7009e | 1188 | ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1189 | else |
81e7009e | 1190 | ret = handle_signal(signr, &ka, &info, oldset, regs, newsp); |
1da177e4 | 1191 | |
69be8f18 | 1192 | if (ret) { |
1da177e4 LT |
1193 | spin_lock_irq(¤t->sighand->siglock); |
1194 | sigorsets(¤t->blocked, ¤t->blocked, | |
1195 | &ka.sa.sa_mask); | |
69be8f18 SR |
1196 | if (!(ka.sa.sa_flags & SA_NODEFER)) |
1197 | sigaddset(¤t->blocked, signr); | |
1da177e4 LT |
1198 | recalc_sigpending(); |
1199 | spin_unlock_irq(¤t->sighand->siglock); | |
f27201da DW |
1200 | /* A signal was successfully delivered; the saved sigmask is in |
1201 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ | |
1202 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
1203 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | return ret; | |
1207 | } |