Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/signal.c | |
3 | * | |
4 | * Copyright (C) 1995-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/signal.h> | |
13 | #include <linux/ptrace.h> | |
14 | #include <linux/personality.h> | |
15 | ||
16 | #include <asm/cacheflush.h> | |
17 | #include <asm/ucontext.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include <asm/unistd.h> | |
20 | ||
21 | #include "ptrace.h" | |
e00d349e | 22 | #include "signal.h" |
1da177e4 LT |
23 | |
24 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
25 | ||
26 | /* | |
27 | * For ARM syscalls, we encode the syscall number into the instruction. | |
28 | */ | |
29 | #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)) | |
30 | #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)) | |
31 | ||
fcca538b NP |
32 | /* |
33 | * With EABI, the syscall number has to be loaded into r7. | |
34 | */ | |
35 | #define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
36 | #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * For Thumb syscalls, we pass the syscall number via r7. We therefore | |
40 | * need two 16-bit instructions. | |
41 | */ | |
42 | #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE)) | |
43 | #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE)) | |
44 | ||
fcca538b NP |
45 | const unsigned long sigreturn_codes[7] = { |
46 | MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, | |
47 | MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN, | |
1da177e4 LT |
48 | }; |
49 | ||
50 | static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall); | |
51 | ||
52 | /* | |
53 | * atomically swap in the new signal mask, and wait for a signal. | |
54 | */ | |
55 | asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs) | |
56 | { | |
57 | sigset_t saveset; | |
58 | ||
59 | mask &= _BLOCKABLE; | |
60 | spin_lock_irq(¤t->sighand->siglock); | |
61 | saveset = current->blocked; | |
62 | siginitset(¤t->blocked, mask); | |
63 | recalc_sigpending(); | |
64 | spin_unlock_irq(¤t->sighand->siglock); | |
65 | regs->ARM_r0 = -EINTR; | |
66 | ||
67 | while (1) { | |
68 | current->state = TASK_INTERRUPTIBLE; | |
69 | schedule(); | |
70 | if (do_signal(&saveset, regs, 0)) | |
71 | return regs->ARM_r0; | |
72 | } | |
73 | } | |
74 | ||
75 | asmlinkage int | |
76 | sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs) | |
77 | { | |
78 | sigset_t saveset, newset; | |
79 | ||
80 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
81 | if (sigsetsize != sizeof(sigset_t)) | |
82 | return -EINVAL; | |
83 | ||
84 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
85 | return -EFAULT; | |
86 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
87 | ||
88 | spin_lock_irq(¤t->sighand->siglock); | |
89 | saveset = current->blocked; | |
90 | current->blocked = newset; | |
91 | recalc_sigpending(); | |
92 | spin_unlock_irq(¤t->sighand->siglock); | |
93 | regs->ARM_r0 = -EINTR; | |
94 | ||
95 | while (1) { | |
96 | current->state = TASK_INTERRUPTIBLE; | |
97 | schedule(); | |
98 | if (do_signal(&saveset, regs, 0)) | |
99 | return regs->ARM_r0; | |
100 | } | |
101 | } | |
102 | ||
103 | asmlinkage int | |
104 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
105 | struct old_sigaction __user *oact) | |
106 | { | |
107 | struct k_sigaction new_ka, old_ka; | |
108 | int ret; | |
109 | ||
110 | if (act) { | |
111 | old_sigset_t mask; | |
112 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
113 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
114 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
115 | return -EFAULT; | |
116 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
117 | __get_user(mask, &act->sa_mask); | |
118 | siginitset(&new_ka.sa.sa_mask, mask); | |
119 | } | |
120 | ||
121 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
122 | ||
123 | if (!ret && oact) { | |
124 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
125 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
126 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
127 | return -EFAULT; | |
128 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
129 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
130 | } | |
131 | ||
132 | return ret; | |
133 | } | |
134 | ||
135 | #ifdef CONFIG_IWMMXT | |
136 | ||
137 | /* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */ | |
138 | #define IWMMXT_STORAGE_SIZE (0x98 + 8) | |
139 | #define IWMMXT_MAGIC0 0x12ef842a | |
140 | #define IWMMXT_MAGIC1 0x1c07ca71 | |
141 | ||
142 | struct iwmmxt_sigframe { | |
143 | unsigned long magic0; | |
144 | unsigned long magic1; | |
145 | unsigned long storage[0x98/4]; | |
146 | }; | |
147 | ||
1da177e4 LT |
148 | static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame) |
149 | { | |
69b04754 HD |
150 | char kbuf[sizeof(*frame) + 8]; |
151 | struct iwmmxt_sigframe *kframe; | |
1da177e4 LT |
152 | |
153 | /* the iWMMXt context must be 64 bit aligned */ | |
69b04754 HD |
154 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); |
155 | kframe->magic0 = IWMMXT_MAGIC0; | |
156 | kframe->magic1 = IWMMXT_MAGIC1; | |
157 | iwmmxt_task_copy(current_thread_info(), &kframe->storage); | |
158 | return __copy_to_user(frame, kframe, sizeof(*frame)); | |
1da177e4 LT |
159 | } |
160 | ||
161 | static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame) | |
162 | { | |
69b04754 HD |
163 | char kbuf[sizeof(*frame) + 8]; |
164 | struct iwmmxt_sigframe *kframe; | |
165 | ||
166 | /* the iWMMXt context must be 64 bit aligned */ | |
167 | kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7); | |
168 | if (__copy_from_user(kframe, frame, sizeof(*frame))) | |
169 | return -1; | |
170 | if (kframe->magic0 != IWMMXT_MAGIC0 || | |
171 | kframe->magic1 != IWMMXT_MAGIC1) | |
172 | return -1; | |
173 | iwmmxt_task_restore(current_thread_info(), &kframe->storage); | |
174 | return 0; | |
1da177e4 LT |
175 | } |
176 | ||
177 | #endif | |
178 | ||
179 | /* | |
180 | * Auxiliary signal frame. This saves stuff like FP state. | |
181 | * The layout of this structure is not part of the user ABI. | |
182 | */ | |
183 | struct aux_sigframe { | |
184 | #ifdef CONFIG_IWMMXT | |
185 | struct iwmmxt_sigframe iwmmxt; | |
186 | #endif | |
187 | #ifdef CONFIG_VFP | |
188 | union vfp_state vfp; | |
189 | #endif | |
190 | }; | |
191 | ||
192 | /* | |
193 | * Do a signal return; undo the signal stack. These are aligned to 64-bit. | |
194 | */ | |
195 | struct sigframe { | |
7d4fdc19 | 196 | struct ucontext uc; |
fcca538b | 197 | unsigned long retcode[2]; |
1da177e4 LT |
198 | struct aux_sigframe aux __attribute__((aligned(8))); |
199 | }; | |
200 | ||
201 | struct rt_sigframe { | |
1da177e4 | 202 | struct siginfo info; |
cb3504e8 | 203 | struct sigframe sig; |
1da177e4 LT |
204 | }; |
205 | ||
206 | static int | |
207 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, | |
208 | struct aux_sigframe __user *aux) | |
209 | { | |
210 | int err = 0; | |
211 | ||
212 | __get_user_error(regs->ARM_r0, &sc->arm_r0, err); | |
213 | __get_user_error(regs->ARM_r1, &sc->arm_r1, err); | |
214 | __get_user_error(regs->ARM_r2, &sc->arm_r2, err); | |
215 | __get_user_error(regs->ARM_r3, &sc->arm_r3, err); | |
216 | __get_user_error(regs->ARM_r4, &sc->arm_r4, err); | |
217 | __get_user_error(regs->ARM_r5, &sc->arm_r5, err); | |
218 | __get_user_error(regs->ARM_r6, &sc->arm_r6, err); | |
219 | __get_user_error(regs->ARM_r7, &sc->arm_r7, err); | |
220 | __get_user_error(regs->ARM_r8, &sc->arm_r8, err); | |
221 | __get_user_error(regs->ARM_r9, &sc->arm_r9, err); | |
222 | __get_user_error(regs->ARM_r10, &sc->arm_r10, err); | |
223 | __get_user_error(regs->ARM_fp, &sc->arm_fp, err); | |
224 | __get_user_error(regs->ARM_ip, &sc->arm_ip, err); | |
225 | __get_user_error(regs->ARM_sp, &sc->arm_sp, err); | |
226 | __get_user_error(regs->ARM_lr, &sc->arm_lr, err); | |
227 | __get_user_error(regs->ARM_pc, &sc->arm_pc, err); | |
228 | __get_user_error(regs->ARM_cpsr, &sc->arm_cpsr, err); | |
229 | ||
230 | err |= !valid_user_regs(regs); | |
231 | ||
232 | #ifdef CONFIG_IWMMXT | |
233 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
234 | err |= restore_iwmmxt_context(&aux->iwmmxt); | |
235 | #endif | |
236 | #ifdef CONFIG_VFP | |
237 | // if (err == 0) | |
238 | // err |= vfp_restore_state(&aux->vfp); | |
239 | #endif | |
240 | ||
241 | return err; | |
242 | } | |
243 | ||
244 | asmlinkage int sys_sigreturn(struct pt_regs *regs) | |
245 | { | |
246 | struct sigframe __user *frame; | |
247 | sigset_t set; | |
248 | ||
249 | /* Always make any pending restarted system calls return -EINTR */ | |
250 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
251 | ||
252 | /* | |
253 | * Since we stacked the signal on a 64-bit boundary, | |
254 | * then 'sp' should be word aligned here. If it's | |
255 | * not, then the user is trying to mess with us. | |
256 | */ | |
257 | if (regs->ARM_sp & 7) | |
258 | goto badframe; | |
259 | ||
260 | frame = (struct sigframe __user *)regs->ARM_sp; | |
261 | ||
262 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
263 | goto badframe; | |
7d4fdc19 | 264 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
1da177e4 LT |
265 | goto badframe; |
266 | ||
267 | sigdelsetmask(&set, ~_BLOCKABLE); | |
268 | spin_lock_irq(¤t->sighand->siglock); | |
269 | current->blocked = set; | |
270 | recalc_sigpending(); | |
271 | spin_unlock_irq(¤t->sighand->siglock); | |
272 | ||
7d4fdc19 | 273 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &frame->aux)) |
1da177e4 LT |
274 | goto badframe; |
275 | ||
276 | /* Send SIGTRAP if we're single-stepping */ | |
277 | if (current->ptrace & PT_SINGLESTEP) { | |
278 | ptrace_cancel_bpt(current); | |
279 | send_sig(SIGTRAP, current, 1); | |
280 | } | |
281 | ||
282 | return regs->ARM_r0; | |
283 | ||
284 | badframe: | |
285 | force_sig(SIGSEGV, current); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) | |
290 | { | |
291 | struct rt_sigframe __user *frame; | |
292 | sigset_t set; | |
293 | ||
294 | /* Always make any pending restarted system calls return -EINTR */ | |
295 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
296 | ||
297 | /* | |
298 | * Since we stacked the signal on a 64-bit boundary, | |
299 | * then 'sp' should be word aligned here. If it's | |
300 | * not, then the user is trying to mess with us. | |
301 | */ | |
302 | if (regs->ARM_sp & 7) | |
303 | goto badframe; | |
304 | ||
305 | frame = (struct rt_sigframe __user *)regs->ARM_sp; | |
306 | ||
307 | if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) | |
308 | goto badframe; | |
cb3504e8 | 309 | if (__copy_from_user(&set, &frame->sig.uc.uc_sigmask, sizeof(set))) |
1da177e4 LT |
310 | goto badframe; |
311 | ||
312 | sigdelsetmask(&set, ~_BLOCKABLE); | |
313 | spin_lock_irq(¤t->sighand->siglock); | |
314 | current->blocked = set; | |
315 | recalc_sigpending(); | |
316 | spin_unlock_irq(¤t->sighand->siglock); | |
317 | ||
cb3504e8 | 318 | if (restore_sigcontext(regs, &frame->sig.uc.uc_mcontext, &frame->sig.aux)) |
1da177e4 LT |
319 | goto badframe; |
320 | ||
cb3504e8 | 321 | if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT) |
1da177e4 LT |
322 | goto badframe; |
323 | ||
324 | /* Send SIGTRAP if we're single-stepping */ | |
325 | if (current->ptrace & PT_SINGLESTEP) { | |
326 | ptrace_cancel_bpt(current); | |
327 | send_sig(SIGTRAP, current, 1); | |
328 | } | |
329 | ||
330 | return regs->ARM_r0; | |
331 | ||
332 | badframe: | |
333 | force_sig(SIGSEGV, current); | |
334 | return 0; | |
335 | } | |
336 | ||
337 | static int | |
338 | setup_sigcontext(struct sigcontext __user *sc, struct aux_sigframe __user *aux, | |
339 | struct pt_regs *regs, unsigned long mask) | |
340 | { | |
341 | int err = 0; | |
342 | ||
343 | __put_user_error(regs->ARM_r0, &sc->arm_r0, err); | |
344 | __put_user_error(regs->ARM_r1, &sc->arm_r1, err); | |
345 | __put_user_error(regs->ARM_r2, &sc->arm_r2, err); | |
346 | __put_user_error(regs->ARM_r3, &sc->arm_r3, err); | |
347 | __put_user_error(regs->ARM_r4, &sc->arm_r4, err); | |
348 | __put_user_error(regs->ARM_r5, &sc->arm_r5, err); | |
349 | __put_user_error(regs->ARM_r6, &sc->arm_r6, err); | |
350 | __put_user_error(regs->ARM_r7, &sc->arm_r7, err); | |
351 | __put_user_error(regs->ARM_r8, &sc->arm_r8, err); | |
352 | __put_user_error(regs->ARM_r9, &sc->arm_r9, err); | |
353 | __put_user_error(regs->ARM_r10, &sc->arm_r10, err); | |
354 | __put_user_error(regs->ARM_fp, &sc->arm_fp, err); | |
355 | __put_user_error(regs->ARM_ip, &sc->arm_ip, err); | |
356 | __put_user_error(regs->ARM_sp, &sc->arm_sp, err); | |
357 | __put_user_error(regs->ARM_lr, &sc->arm_lr, err); | |
358 | __put_user_error(regs->ARM_pc, &sc->arm_pc, err); | |
359 | __put_user_error(regs->ARM_cpsr, &sc->arm_cpsr, err); | |
360 | ||
361 | __put_user_error(current->thread.trap_no, &sc->trap_no, err); | |
362 | __put_user_error(current->thread.error_code, &sc->error_code, err); | |
363 | __put_user_error(current->thread.address, &sc->fault_address, err); | |
364 | __put_user_error(mask, &sc->oldmask, err); | |
365 | ||
366 | #ifdef CONFIG_IWMMXT | |
367 | if (err == 0 && test_thread_flag(TIF_USING_IWMMXT)) | |
368 | err |= preserve_iwmmxt_context(&aux->iwmmxt); | |
369 | #endif | |
370 | #ifdef CONFIG_VFP | |
371 | // if (err == 0) | |
372 | // err |= vfp_save_state(&aux->vfp); | |
373 | #endif | |
374 | ||
375 | return err; | |
376 | } | |
377 | ||
378 | static inline void __user * | |
379 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize) | |
380 | { | |
381 | unsigned long sp = regs->ARM_sp; | |
382 | void __user *frame; | |
383 | ||
384 | /* | |
385 | * This is the X/Open sanctioned signal stack switching. | |
386 | */ | |
387 | if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) | |
388 | sp = current->sas_ss_sp + current->sas_ss_size; | |
389 | ||
390 | /* | |
391 | * ATPCS B01 mandates 8-byte alignment | |
392 | */ | |
393 | frame = (void __user *)((sp - framesize) & ~7); | |
394 | ||
395 | /* | |
396 | * Check that we can actually write to the signal frame. | |
397 | */ | |
398 | if (!access_ok(VERIFY_WRITE, frame, framesize)) | |
399 | frame = NULL; | |
400 | ||
401 | return frame; | |
402 | } | |
403 | ||
404 | static int | |
405 | setup_return(struct pt_regs *regs, struct k_sigaction *ka, | |
406 | unsigned long __user *rc, void __user *frame, int usig) | |
407 | { | |
408 | unsigned long handler = (unsigned long)ka->sa.sa_handler; | |
409 | unsigned long retcode; | |
410 | int thumb = 0; | |
411 | unsigned long cpsr = regs->ARM_cpsr & ~PSR_f; | |
412 | ||
413 | /* | |
414 | * Maybe we need to deliver a 32-bit signal to a 26-bit task. | |
415 | */ | |
416 | if (ka->sa.sa_flags & SA_THIRTYTWO) | |
417 | cpsr = (cpsr & ~MODE_MASK) | USR_MODE; | |
418 | ||
419 | #ifdef CONFIG_ARM_THUMB | |
420 | if (elf_hwcap & HWCAP_THUMB) { | |
421 | /* | |
422 | * The LSB of the handler determines if we're going to | |
423 | * be using THUMB or ARM mode for this signal handler. | |
424 | */ | |
425 | thumb = handler & 1; | |
426 | ||
427 | if (thumb) | |
428 | cpsr |= PSR_T_BIT; | |
429 | else | |
430 | cpsr &= ~PSR_T_BIT; | |
431 | } | |
432 | #endif | |
433 | ||
434 | if (ka->sa.sa_flags & SA_RESTORER) { | |
435 | retcode = (unsigned long)ka->sa.sa_restorer; | |
436 | } else { | |
fcca538b | 437 | unsigned int idx = thumb << 1; |
1da177e4 LT |
438 | |
439 | if (ka->sa.sa_flags & SA_SIGINFO) | |
fcca538b | 440 | idx += 3; |
1da177e4 | 441 | |
fcca538b NP |
442 | if (__put_user(sigreturn_codes[idx], rc) || |
443 | __put_user(sigreturn_codes[idx+1], rc+1)) | |
1da177e4 LT |
444 | return 1; |
445 | ||
e00d349e RK |
446 | if (cpsr & MODE32_BIT) { |
447 | /* | |
448 | * 32-bit code can use the new high-page | |
449 | * signal return code support. | |
450 | */ | |
451 | retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb; | |
452 | } else { | |
453 | /* | |
454 | * Ensure that the instruction cache sees | |
455 | * the return code written onto the stack. | |
456 | */ | |
457 | flush_icache_range((unsigned long)rc, | |
fcca538b | 458 | (unsigned long)(rc + 2)); |
e00d349e RK |
459 | |
460 | retcode = ((unsigned long)rc) + thumb; | |
461 | } | |
1da177e4 LT |
462 | } |
463 | ||
464 | regs->ARM_r0 = usig; | |
465 | regs->ARM_sp = (unsigned long)frame; | |
466 | regs->ARM_lr = retcode; | |
467 | regs->ARM_pc = handler; | |
468 | regs->ARM_cpsr = cpsr; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int | |
474 | setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs) | |
475 | { | |
476 | struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
477 | int err = 0; | |
478 | ||
479 | if (!frame) | |
480 | return 1; | |
481 | ||
7d4fdc19 RK |
482 | err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->aux, regs, set->sig[0]); |
483 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
1da177e4 LT |
484 | |
485 | if (err == 0) | |
fcca538b | 486 | err = setup_return(regs, ka, frame->retcode, frame, usig); |
1da177e4 LT |
487 | |
488 | return err; | |
489 | } | |
490 | ||
491 | static int | |
492 | setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, | |
493 | sigset_t *set, struct pt_regs *regs) | |
494 | { | |
495 | struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame)); | |
496 | stack_t stack; | |
497 | int err = 0; | |
498 | ||
499 | if (!frame) | |
500 | return 1; | |
501 | ||
1da177e4 LT |
502 | err |= copy_siginfo_to_user(&frame->info, info); |
503 | ||
cb3504e8 RK |
504 | __put_user_error(0, &frame->sig.uc.uc_flags, err); |
505 | __put_user_error(NULL, &frame->sig.uc.uc_link, err); | |
1da177e4 LT |
506 | |
507 | memset(&stack, 0, sizeof(stack)); | |
508 | stack.ss_sp = (void __user *)current->sas_ss_sp; | |
509 | stack.ss_flags = sas_ss_flags(regs->ARM_sp); | |
510 | stack.ss_size = current->sas_ss_size; | |
cb3504e8 | 511 | err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); |
1da177e4 | 512 | |
cb3504e8 | 513 | err |= setup_sigcontext(&frame->sig.uc.uc_mcontext, &frame->sig.aux, |
1da177e4 | 514 | regs, set->sig[0]); |
cb3504e8 | 515 | err |= __copy_to_user(&frame->sig.uc.uc_sigmask, set, sizeof(*set)); |
1da177e4 LT |
516 | |
517 | if (err == 0) | |
cb3504e8 | 518 | err = setup_return(regs, ka, frame->sig.retcode, frame, usig); |
1da177e4 LT |
519 | |
520 | if (err == 0) { | |
521 | /* | |
522 | * For realtime signals we must also set the second and third | |
523 | * arguments for the signal handler. | |
524 | * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 | |
525 | */ | |
526 | regs->ARM_r1 = (unsigned long)&frame->info; | |
cb3504e8 | 527 | regs->ARM_r2 = (unsigned long)&frame->sig.uc; |
1da177e4 LT |
528 | } |
529 | ||
530 | return err; | |
531 | } | |
532 | ||
533 | static inline void restart_syscall(struct pt_regs *regs) | |
534 | { | |
535 | regs->ARM_r0 = regs->ARM_ORIG_r0; | |
536 | regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; | |
537 | } | |
538 | ||
539 | /* | |
540 | * OK, we're invoking a handler | |
541 | */ | |
542 | static void | |
543 | handle_signal(unsigned long sig, struct k_sigaction *ka, | |
544 | siginfo_t *info, sigset_t *oldset, | |
545 | struct pt_regs * regs, int syscall) | |
546 | { | |
547 | struct thread_info *thread = current_thread_info(); | |
548 | struct task_struct *tsk = current; | |
549 | int usig = sig; | |
550 | int ret; | |
551 | ||
552 | /* | |
553 | * If we were from a system call, check for system call restarting... | |
554 | */ | |
555 | if (syscall) { | |
556 | switch (regs->ARM_r0) { | |
557 | case -ERESTART_RESTARTBLOCK: | |
558 | case -ERESTARTNOHAND: | |
559 | regs->ARM_r0 = -EINTR; | |
560 | break; | |
561 | case -ERESTARTSYS: | |
562 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
563 | regs->ARM_r0 = -EINTR; | |
564 | break; | |
565 | } | |
566 | /* fallthrough */ | |
567 | case -ERESTARTNOINTR: | |
568 | restart_syscall(regs); | |
569 | } | |
570 | } | |
571 | ||
572 | /* | |
573 | * translate the signal | |
574 | */ | |
575 | if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap) | |
576 | usig = thread->exec_domain->signal_invmap[usig]; | |
577 | ||
578 | /* | |
579 | * Set up the stack frame | |
580 | */ | |
581 | if (ka->sa.sa_flags & SA_SIGINFO) | |
582 | ret = setup_rt_frame(usig, ka, info, oldset, regs); | |
583 | else | |
584 | ret = setup_frame(usig, ka, oldset, regs); | |
585 | ||
586 | /* | |
587 | * Check that the resulting registers are actually sane. | |
588 | */ | |
589 | ret |= !valid_user_regs(regs); | |
590 | ||
69be8f18 | 591 | if (ret != 0) { |
a6c61e9d DJ |
592 | force_sigsegv(sig, tsk); |
593 | return; | |
1da177e4 LT |
594 | } |
595 | ||
a6c61e9d DJ |
596 | /* |
597 | * Block the signal if we were successful. | |
598 | */ | |
599 | spin_lock_irq(&tsk->sighand->siglock); | |
600 | sigorsets(&tsk->blocked, &tsk->blocked, | |
601 | &ka->sa.sa_mask); | |
602 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
603 | sigaddset(&tsk->blocked, sig); | |
604 | recalc_sigpending(); | |
605 | spin_unlock_irq(&tsk->sighand->siglock); | |
1da177e4 | 606 | |
1da177e4 LT |
607 | } |
608 | ||
609 | /* | |
610 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
611 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
612 | * mistake. | |
613 | * | |
614 | * Note that we go through the signals twice: once to check the signals that | |
615 | * the kernel can handle, and then we build all the user-level signal handling | |
616 | * stack-frames in one go after that. | |
617 | */ | |
618 | static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall) | |
619 | { | |
620 | struct k_sigaction ka; | |
621 | siginfo_t info; | |
622 | int signr; | |
623 | ||
624 | /* | |
625 | * We want the common case to go fast, which | |
626 | * is why we may in certain cases get here from | |
627 | * kernel mode. Just return without doing anything | |
628 | * if so. | |
629 | */ | |
630 | if (!user_mode(regs)) | |
631 | return 0; | |
632 | ||
bdb94f3a | 633 | if (try_to_freeze()) |
1da177e4 LT |
634 | goto no_signal; |
635 | ||
636 | if (current->ptrace & PT_SINGLESTEP) | |
637 | ptrace_cancel_bpt(current); | |
638 | ||
639 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
640 | if (signr > 0) { | |
641 | handle_signal(signr, &ka, &info, oldset, regs, syscall); | |
642 | if (current->ptrace & PT_SINGLESTEP) | |
643 | ptrace_set_bpt(current); | |
644 | return 1; | |
645 | } | |
646 | ||
647 | no_signal: | |
648 | /* | |
649 | * No signal to deliver to the process - restart the syscall. | |
650 | */ | |
651 | if (syscall) { | |
652 | if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) { | |
653 | if (thumb_mode(regs)) { | |
654 | regs->ARM_r7 = __NR_restart_syscall; | |
655 | regs->ARM_pc -= 2; | |
656 | } else { | |
657 | u32 __user *usp; | |
658 | ||
659 | regs->ARM_sp -= 12; | |
660 | usp = (u32 __user *)regs->ARM_sp; | |
661 | ||
662 | put_user(regs->ARM_pc, &usp[0]); | |
663 | /* swi __NR_restart_syscall */ | |
664 | put_user(0xef000000 | __NR_restart_syscall, &usp[1]); | |
665 | /* ldr pc, [sp], #12 */ | |
666 | put_user(0xe49df00c, &usp[2]); | |
667 | ||
668 | flush_icache_range((unsigned long)usp, | |
669 | (unsigned long)(usp + 3)); | |
670 | ||
671 | regs->ARM_pc = regs->ARM_sp + 4; | |
672 | } | |
673 | } | |
674 | if (regs->ARM_r0 == -ERESTARTNOHAND || | |
675 | regs->ARM_r0 == -ERESTARTSYS || | |
676 | regs->ARM_r0 == -ERESTARTNOINTR) { | |
677 | restart_syscall(regs); | |
678 | } | |
679 | } | |
680 | if (current->ptrace & PT_SINGLESTEP) | |
681 | ptrace_set_bpt(current); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | asmlinkage void | |
686 | do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall) | |
687 | { | |
688 | if (thread_flags & _TIF_SIGPENDING) | |
689 | do_signal(¤t->blocked, regs, syscall); | |
690 | } |