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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * PowerPC version |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Derived from "arch/i386/kernel/signal.c" | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/mm.h> | |
17 | #include <linux/smp.h> | |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/signal.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/elf.h> | |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/module.h> | |
27 | ||
28 | #include <asm/sigcontext.h> | |
29 | #include <asm/ucontext.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/pgtable.h> | |
1da177e4 LT |
32 | #include <asm/unistd.h> |
33 | #include <asm/cacheflush.h> | |
a7f31841 | 34 | #include <asm/syscalls.h> |
1da177e4 LT |
35 | #include <asm/vdso.h> |
36 | ||
37 | #define DEBUG_SIG 0 | |
38 | ||
39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
40 | ||
6741f3a7 | 41 | #define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs)) |
1da177e4 LT |
42 | #define FP_REGS_SIZE sizeof(elf_fpregset_t) |
43 | ||
44 | #define TRAMP_TRACEBACK 3 | |
45 | #define TRAMP_SIZE 6 | |
46 | ||
47 | /* | |
48 | * When we have signals to deliver, we set up on the user stack, | |
49 | * going down from the original stack pointer: | |
50 | * 1) a rt_sigframe struct which contains the ucontext | |
51 | * 2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller | |
52 | * frame for the signal handler. | |
53 | */ | |
54 | ||
55 | struct rt_sigframe { | |
56 | /* sys_rt_sigreturn requires the ucontext be the first field */ | |
57 | struct ucontext uc; | |
58 | unsigned long _unused[2]; | |
59 | unsigned int tramp[TRAMP_SIZE]; | |
29e646df AV |
60 | struct siginfo __user *pinfo; |
61 | void __user *puc; | |
1da177e4 LT |
62 | struct siginfo info; |
63 | /* 64 bit ABI allows for 288 bytes below sp before decrementing it. */ | |
64 | char abigap[288]; | |
65 | } __attribute__ ((aligned (16))); | |
66 | ||
1da177e4 LT |
67 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, unsigned long r5, |
68 | unsigned long r6, unsigned long r7, unsigned long r8, | |
69 | struct pt_regs *regs) | |
70 | { | |
71 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
72 | } | |
73 | ||
74 | ||
75 | /* | |
76 | * Set up the sigcontext for the signal frame. | |
77 | */ | |
78 | ||
79 | static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, | |
80 | int signr, sigset_t *set, unsigned long handler) | |
81 | { | |
82 | /* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the | |
83 | * process never used altivec yet (MSR_VEC is zero in pt_regs of | |
84 | * the context). This is very important because we must ensure we | |
85 | * don't lose the VRSAVE content that may have been set prior to | |
86 | * the process doing its first vector operation | |
87 | * Userland shall check AT_HWCAP to know wether it can rely on the | |
88 | * v_regs pointer or not | |
89 | */ | |
90 | #ifdef CONFIG_ALTIVEC | |
91 | elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful); | |
92 | #endif | |
93 | long err = 0; | |
94 | ||
95 | flush_fp_to_thread(current); | |
96 | ||
1da177e4 LT |
97 | #ifdef CONFIG_ALTIVEC |
98 | err |= __put_user(v_regs, &sc->v_regs); | |
99 | ||
100 | /* save altivec registers */ | |
101 | if (current->thread.used_vr) { | |
102 | flush_altivec_to_thread(current); | |
103 | /* Copy 33 vec registers (vr0..31 and vscr) to the stack */ | |
104 | err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128)); | |
105 | /* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg) | |
106 | * contains valid data. | |
107 | */ | |
108 | regs->msr |= MSR_VEC; | |
109 | } | |
110 | /* We always copy to/from vrsave, it's 0 if we don't have or don't | |
111 | * use altivec. | |
112 | */ | |
113 | err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]); | |
114 | #else /* CONFIG_ALTIVEC */ | |
115 | err |= __put_user(0, &sc->v_regs); | |
116 | #endif /* CONFIG_ALTIVEC */ | |
117 | err |= __put_user(&sc->gp_regs, &sc->regs); | |
1bd79336 | 118 | WARN_ON(!FULL_REGS(regs)); |
1da177e4 LT |
119 | err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE); |
120 | err |= __copy_to_user(&sc->fp_regs, ¤t->thread.fpr, FP_REGS_SIZE); | |
121 | err |= __put_user(signr, &sc->signal); | |
122 | err |= __put_user(handler, &sc->handler); | |
123 | if (set != NULL) | |
124 | err |= __put_user(set->sig[0], &sc->oldmask); | |
125 | ||
126 | return err; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Restore the sigcontext from the signal frame. | |
131 | */ | |
132 | ||
133 | static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig, | |
134 | struct sigcontext __user *sc) | |
135 | { | |
136 | #ifdef CONFIG_ALTIVEC | |
137 | elf_vrreg_t __user *v_regs; | |
138 | #endif | |
139 | unsigned long err = 0; | |
140 | unsigned long save_r13 = 0; | |
141 | elf_greg_t *gregs = (elf_greg_t *)regs; | |
1da177e4 | 142 | unsigned long msr; |
1da177e4 LT |
143 | int i; |
144 | ||
145 | /* If this is not a signal return, we preserve the TLS in r13 */ | |
146 | if (!sig) | |
147 | save_r13 = regs->gpr[13]; | |
148 | ||
149 | /* copy everything before MSR */ | |
150 | err |= __copy_from_user(regs, &sc->gp_regs, | |
151 | PT_MSR*sizeof(unsigned long)); | |
152 | ||
fab5db97 PM |
153 | /* get MSR separately, transfer the LE bit if doing signal return */ |
154 | err |= __get_user(msr, &sc->gp_regs[PT_MSR]); | |
155 | if (sig) | |
156 | regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); | |
157 | ||
158 | /* skip SOFTE */ | |
1da177e4 LT |
159 | for (i = PT_MSR+1; i <= PT_RESULT; i++) { |
160 | if (i == PT_SOFTE) | |
161 | continue; | |
162 | err |= __get_user(gregs[i], &sc->gp_regs[i]); | |
163 | } | |
164 | ||
165 | if (!sig) | |
166 | regs->gpr[13] = save_r13; | |
1da177e4 LT |
167 | if (set != NULL) |
168 | err |= __get_user(set->sig[0], &sc->oldmask); | |
169 | ||
5388fb10 PM |
170 | /* |
171 | * Do this before updating the thread state in | |
172 | * current->thread.fpr/vr. That way, if we get preempted | |
173 | * and another task grabs the FPU/Altivec, it won't be | |
174 | * tempted to save the current CPU state into the thread_struct | |
175 | * and corrupt what we are writing there. | |
176 | */ | |
177 | discard_lazy_cpu_state(); | |
178 | ||
179 | err |= __copy_from_user(¤t->thread.fpr, &sc->fp_regs, FP_REGS_SIZE); | |
180 | ||
1da177e4 LT |
181 | #ifdef CONFIG_ALTIVEC |
182 | err |= __get_user(v_regs, &sc->v_regs); | |
1da177e4 LT |
183 | if (err) |
184 | return err; | |
7c85d1f9 PM |
185 | if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128))) |
186 | return -EFAULT; | |
1da177e4 LT |
187 | /* Copy 33 vec registers (vr0..31 and vscr) from the stack */ |
188 | if (v_regs != 0 && (msr & MSR_VEC) != 0) | |
189 | err |= __copy_from_user(current->thread.vr, v_regs, | |
190 | 33 * sizeof(vector128)); | |
191 | else if (current->thread.used_vr) | |
192 | memset(current->thread.vr, 0, 33 * sizeof(vector128)); | |
193 | /* Always get VRSAVE back */ | |
194 | if (v_regs != 0) | |
195 | err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]); | |
196 | else | |
197 | current->thread.vrsave = 0; | |
198 | #endif /* CONFIG_ALTIVEC */ | |
199 | ||
1da177e4 LT |
200 | /* Force reload of FP/VEC */ |
201 | regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC); | |
202 | ||
203 | return err; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Allocate space for the signal frame | |
208 | */ | |
209 | static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
210 | size_t frame_size) | |
211 | { | |
212 | unsigned long newsp; | |
213 | ||
214 | /* Default to using normal stack */ | |
215 | newsp = regs->gpr[1]; | |
216 | ||
11089f08 | 217 | if ((ka->sa.sa_flags & SA_ONSTACK) && current->sas_ss_size) { |
1da177e4 LT |
218 | if (! on_sig_stack(regs->gpr[1])) |
219 | newsp = (current->sas_ss_sp + current->sas_ss_size); | |
220 | } | |
221 | ||
222 | return (void __user *)((newsp - frame_size) & -16ul); | |
223 | } | |
224 | ||
225 | /* | |
226 | * Setup the trampoline code on the stack | |
227 | */ | |
228 | static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp) | |
229 | { | |
230 | int i; | |
231 | long err = 0; | |
232 | ||
233 | /* addi r1, r1, __SIGNAL_FRAMESIZE # Pop the dummy stackframe */ | |
234 | err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]); | |
235 | /* li r0, __NR_[rt_]sigreturn| */ | |
236 | err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]); | |
237 | /* sc */ | |
238 | err |= __put_user(0x44000002UL, &tramp[2]); | |
239 | ||
240 | /* Minimal traceback info */ | |
241 | for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++) | |
242 | err |= __put_user(0, &tramp[i]); | |
243 | ||
244 | if (!err) | |
245 | flush_icache_range((unsigned long) &tramp[0], | |
246 | (unsigned long) &tramp[TRAMP_SIZE]); | |
247 | ||
248 | return err; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Restore the user process's signal mask (also used by signal32.c) | |
253 | */ | |
254 | void restore_sigmask(sigset_t *set) | |
255 | { | |
256 | sigdelsetmask(set, ~_BLOCKABLE); | |
257 | spin_lock_irq(¤t->sighand->siglock); | |
258 | current->blocked = *set; | |
259 | recalc_sigpending(); | |
260 | spin_unlock_irq(¤t->sighand->siglock); | |
261 | } | |
262 | ||
263 | ||
264 | /* | |
265 | * Handle {get,set,swap}_context operations | |
266 | */ | |
267 | int sys_swapcontext(struct ucontext __user *old_ctx, | |
268 | struct ucontext __user *new_ctx, | |
269 | long ctx_size, long r6, long r7, long r8, struct pt_regs *regs) | |
270 | { | |
271 | unsigned char tmp; | |
272 | sigset_t set; | |
273 | ||
274 | /* Context size is for future use. Right now, we only make sure | |
275 | * we are passed something we understand | |
276 | */ | |
277 | if (ctx_size < sizeof(struct ucontext)) | |
278 | return -EINVAL; | |
279 | ||
280 | if (old_ctx != NULL) { | |
281 | if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) | |
282 | || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0) | |
283 | || __copy_to_user(&old_ctx->uc_sigmask, | |
284 | ¤t->blocked, sizeof(sigset_t))) | |
285 | return -EFAULT; | |
286 | } | |
287 | if (new_ctx == NULL) | |
288 | return 0; | |
289 | if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx)) | |
290 | || __get_user(tmp, (u8 __user *) new_ctx) | |
291 | || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1)) | |
292 | return -EFAULT; | |
293 | ||
294 | /* | |
295 | * If we get a fault copying the context into the kernel's | |
296 | * image of the user's registers, we can't just return -EFAULT | |
297 | * because the user's registers will be corrupted. For instance | |
298 | * the NIP value may have been updated but not some of the | |
299 | * other registers. Given that we have done the access_ok | |
300 | * and successfully read the first and last bytes of the region | |
301 | * above, this should only happen in an out-of-memory situation | |
302 | * or if another thread unmaps the region containing the context. | |
303 | * We kill the task with a SIGSEGV in this situation. | |
304 | */ | |
305 | ||
306 | if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set))) | |
307 | do_exit(SIGSEGV); | |
308 | restore_sigmask(&set); | |
309 | if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext)) | |
310 | do_exit(SIGSEGV); | |
311 | ||
312 | /* This returns like rt_sigreturn */ | |
401d1f02 | 313 | set_thread_flag(TIF_RESTOREALL); |
1da177e4 LT |
314 | return 0; |
315 | } | |
316 | ||
317 | ||
318 | /* | |
319 | * Do a signal return; undo the signal stack. | |
320 | */ | |
321 | ||
322 | int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5, | |
323 | unsigned long r6, unsigned long r7, unsigned long r8, | |
324 | struct pt_regs *regs) | |
325 | { | |
326 | struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1]; | |
327 | sigset_t set; | |
328 | ||
329 | /* Always make any pending restarted system calls return -EINTR */ | |
330 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
331 | ||
332 | if (!access_ok(VERIFY_READ, uc, sizeof(*uc))) | |
333 | goto badframe; | |
334 | ||
335 | if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set))) | |
336 | goto badframe; | |
337 | restore_sigmask(&set); | |
338 | if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext)) | |
339 | goto badframe; | |
340 | ||
341 | /* do_sigaltstack expects a __user pointer and won't modify | |
342 | * what's in there anyway | |
343 | */ | |
344 | do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]); | |
345 | ||
401d1f02 DW |
346 | set_thread_flag(TIF_RESTOREALL); |
347 | return 0; | |
1da177e4 LT |
348 | |
349 | badframe: | |
350 | #if DEBUG_SIG | |
351 | printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n", | |
352 | regs, uc, &uc->uc_mcontext); | |
353 | #endif | |
354 | force_sig(SIGSEGV, current); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info, | |
359 | sigset_t *set, struct pt_regs *regs) | |
360 | { | |
361 | /* Handler is *really* a pointer to the function descriptor for | |
362 | * the signal routine. The first entry in the function | |
363 | * descriptor is the entry address of signal and the second | |
364 | * entry is the TOC value we need to use. | |
365 | */ | |
366 | func_descr_t __user *funct_desc_ptr; | |
367 | struct rt_sigframe __user *frame; | |
368 | unsigned long newsp = 0; | |
369 | long err = 0; | |
370 | ||
371 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
372 | ||
373 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
374 | goto badframe; | |
375 | ||
376 | err |= __put_user(&frame->info, &frame->pinfo); | |
377 | err |= __put_user(&frame->uc, &frame->puc); | |
378 | err |= copy_siginfo_to_user(&frame->info, info); | |
379 | if (err) | |
380 | goto badframe; | |
381 | ||
382 | /* Create the ucontext. */ | |
383 | err |= __put_user(0, &frame->uc.uc_flags); | |
384 | err |= __put_user(0, &frame->uc.uc_link); | |
385 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
386 | err |= __put_user(sas_ss_flags(regs->gpr[1]), | |
387 | &frame->uc.uc_stack.ss_flags); | |
388 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
389 | err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL, | |
390 | (unsigned long)ka->sa.sa_handler); | |
391 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
392 | if (err) | |
393 | goto badframe; | |
394 | ||
cc657f53 PM |
395 | /* Make sure signal handler doesn't get spurious FP exceptions */ |
396 | current->thread.fpscr.val = 0; | |
397 | ||
1da177e4 | 398 | /* Set up to return from userspace. */ |
a5bba930 BH |
399 | if (vdso64_rt_sigtramp && current->mm->context.vdso_base) { |
400 | regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp; | |
1da177e4 LT |
401 | } else { |
402 | err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]); | |
403 | if (err) | |
404 | goto badframe; | |
405 | regs->link = (unsigned long) &frame->tramp[0]; | |
406 | } | |
407 | funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler; | |
408 | ||
409 | /* Allocate a dummy caller frame for the signal handler. */ | |
410 | newsp = (unsigned long)frame - __SIGNAL_FRAMESIZE; | |
411 | err |= put_user(regs->gpr[1], (unsigned long __user *)newsp); | |
412 | ||
413 | /* Set up "regs" so we "return" to the signal handler. */ | |
414 | err |= get_user(regs->nip, &funct_desc_ptr->entry); | |
fab5db97 PM |
415 | /* enter the signal handler in big-endian mode */ |
416 | regs->msr &= ~MSR_LE; | |
1da177e4 LT |
417 | regs->gpr[1] = newsp; |
418 | err |= get_user(regs->gpr[2], &funct_desc_ptr->toc); | |
419 | regs->gpr[3] = signr; | |
420 | regs->result = 0; | |
421 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
422 | err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo); | |
423 | err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc); | |
424 | regs->gpr[6] = (unsigned long) frame; | |
425 | } else { | |
426 | regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext; | |
427 | } | |
428 | if (err) | |
429 | goto badframe; | |
430 | ||
1da177e4 LT |
431 | return 1; |
432 | ||
433 | badframe: | |
434 | #if DEBUG_SIG | |
435 | printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n", | |
436 | regs, frame, newsp); | |
437 | #endif | |
438 | force_sigsegv(signr, current); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | ||
443 | /* | |
444 | * OK, we're invoking a handler | |
445 | */ | |
446 | static int handle_signal(unsigned long sig, struct k_sigaction *ka, | |
447 | siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) | |
448 | { | |
449 | int ret; | |
450 | ||
451 | /* Set up Signal Frame */ | |
452 | ret = setup_rt_frame(sig, ka, info, oldset, regs); | |
453 | ||
69be8f18 | 454 | if (ret) { |
1da177e4 LT |
455 | spin_lock_irq(¤t->sighand->siglock); |
456 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); | |
69be8f18 SR |
457 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
458 | sigaddset(¤t->blocked,sig); | |
1da177e4 LT |
459 | recalc_sigpending(); |
460 | spin_unlock_irq(¤t->sighand->siglock); | |
461 | } | |
462 | ||
463 | return ret; | |
464 | } | |
465 | ||
466 | static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) | |
467 | { | |
468 | switch ((int)regs->result) { | |
469 | case -ERESTART_RESTARTBLOCK: | |
470 | case -ERESTARTNOHAND: | |
471 | /* ERESTARTNOHAND means that the syscall should only be | |
472 | * restarted if there was no handler for the signal, and since | |
473 | * we only get here if there is a handler, we dont restart. | |
474 | */ | |
475 | regs->result = -EINTR; | |
401d1f02 DW |
476 | regs->gpr[3] = EINTR; |
477 | regs->ccr |= 0x10000000; | |
1da177e4 LT |
478 | break; |
479 | case -ERESTARTSYS: | |
480 | /* ERESTARTSYS means to restart the syscall if there is no | |
481 | * handler or the handler was registered with SA_RESTART | |
482 | */ | |
483 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
484 | regs->result = -EINTR; | |
401d1f02 DW |
485 | regs->gpr[3] = EINTR; |
486 | regs->ccr |= 0x10000000; | |
1da177e4 LT |
487 | break; |
488 | } | |
489 | /* fallthrough */ | |
490 | case -ERESTARTNOINTR: | |
491 | /* ERESTARTNOINTR means that the syscall should be | |
492 | * called again after the signal handler returns. | |
493 | */ | |
494 | regs->gpr[3] = regs->orig_gpr3; | |
495 | regs->nip -= 4; | |
496 | regs->result = 0; | |
497 | break; | |
498 | } | |
499 | } | |
500 | ||
501 | /* | |
502 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
503 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
504 | * mistake. | |
505 | */ | |
506 | int do_signal(sigset_t *oldset, struct pt_regs *regs) | |
507 | { | |
508 | siginfo_t info; | |
509 | int signr; | |
510 | struct k_sigaction ka; | |
511 | ||
512 | /* | |
513 | * If the current thread is 32 bit - invoke the | |
514 | * 32 bit signal handling code | |
515 | */ | |
516 | if (test_thread_flag(TIF_32BIT)) | |
517 | return do_signal32(oldset, regs); | |
518 | ||
f27201da DW |
519 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
520 | oldset = ¤t->saved_sigmask; | |
521 | else if (!oldset) | |
1da177e4 LT |
522 | oldset = ¤t->blocked; |
523 | ||
524 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
525 | if (signr > 0) { | |
f27201da DW |
526 | int ret; |
527 | ||
1da177e4 LT |
528 | /* Whee! Actually deliver the signal. */ |
529 | if (TRAP(regs) == 0x0C00) | |
530 | syscall_restart(regs, &ka); | |
fd9648df AB |
531 | |
532 | /* | |
533 | * Reenable the DABR before delivering the signal to | |
534 | * user space. The DABR will have been cleared if it | |
535 | * triggered inside the kernel. | |
536 | */ | |
537 | if (current->thread.dabr) | |
538 | set_dabr(current->thread.dabr); | |
539 | ||
f27201da DW |
540 | ret = handle_signal(signr, &ka, &info, oldset, regs); |
541 | ||
542 | /* If a signal was successfully delivered, the saved sigmask is in | |
543 | its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ | |
544 | if (ret && test_thread_flag(TIF_RESTORE_SIGMASK)) | |
545 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
546 | ||
547 | return ret; | |
1da177e4 LT |
548 | } |
549 | ||
550 | if (TRAP(regs) == 0x0C00) { /* System Call! */ | |
551 | if ((int)regs->result == -ERESTARTNOHAND || | |
552 | (int)regs->result == -ERESTARTSYS || | |
553 | (int)regs->result == -ERESTARTNOINTR) { | |
554 | regs->gpr[3] = regs->orig_gpr3; | |
555 | regs->nip -= 4; /* Back up & retry system call */ | |
556 | regs->result = 0; | |
557 | } else if ((int)regs->result == -ERESTART_RESTARTBLOCK) { | |
558 | regs->gpr[0] = __NR_restart_syscall; | |
559 | regs->nip -= 4; | |
560 | regs->result = 0; | |
561 | } | |
562 | } | |
f27201da DW |
563 | /* No signal to deliver -- put the saved sigmask back */ |
564 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
565 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
566 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
567 | } | |
1da177e4 LT |
568 | |
569 | return 0; | |
570 | } | |
571 | EXPORT_SYMBOL(do_signal); |