projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-v3.8' of git://git.infradead.org/users/cbou/linux-pstore
[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / arch / arm64 / kernel / signal32.c
1 /*
2 * Based on arch/arm/kernel/signal.c
3 *
4 * Copyright (C) 1995-2009 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 * Modified by Will Deacon <will.deacon@arm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include <linux/compat.h>
22 #include <linux/signal.h>
23 #include <linux/syscalls.h>
24 #include <linux/ratelimit.h>
25
26 #include <asm/fpsimd.h>
27 #include <asm/signal32.h>
28 #include <asm/uaccess.h>
29 #include <asm/unistd32.h>
30
31 struct compat_sigaction {
32 compat_uptr_t sa_handler;
33 compat_ulong_t sa_flags;
34 compat_uptr_t sa_restorer;
35 compat_sigset_t sa_mask;
36 };
37
38 struct compat_old_sigaction {
39 compat_uptr_t sa_handler;
40 compat_old_sigset_t sa_mask;
41 compat_ulong_t sa_flags;
42 compat_uptr_t sa_restorer;
43 };
44
45 typedef struct compat_sigaltstack {
46 compat_uptr_t ss_sp;
47 int ss_flags;
48 compat_size_t ss_size;
49 } compat_stack_t;
50
51 struct compat_sigcontext {
52 /* We always set these two fields to 0 */
53 compat_ulong_t trap_no;
54 compat_ulong_t error_code;
55
56 compat_ulong_t oldmask;
57 compat_ulong_t arm_r0;
58 compat_ulong_t arm_r1;
59 compat_ulong_t arm_r2;
60 compat_ulong_t arm_r3;
61 compat_ulong_t arm_r4;
62 compat_ulong_t arm_r5;
63 compat_ulong_t arm_r6;
64 compat_ulong_t arm_r7;
65 compat_ulong_t arm_r8;
66 compat_ulong_t arm_r9;
67 compat_ulong_t arm_r10;
68 compat_ulong_t arm_fp;
69 compat_ulong_t arm_ip;
70 compat_ulong_t arm_sp;
71 compat_ulong_t arm_lr;
72 compat_ulong_t arm_pc;
73 compat_ulong_t arm_cpsr;
74 compat_ulong_t fault_address;
75 };
76
77 struct compat_ucontext {
78 compat_ulong_t uc_flags;
79 struct compat_ucontext *uc_link;
80 compat_stack_t uc_stack;
81 struct compat_sigcontext uc_mcontext;
82 compat_sigset_t uc_sigmask;
83 int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
84 compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8)));
85 };
86
87 struct compat_vfp_sigframe {
88 compat_ulong_t magic;
89 compat_ulong_t size;
90 struct compat_user_vfp {
91 compat_u64 fpregs[32];
92 compat_ulong_t fpscr;
93 } ufp;
94 struct compat_user_vfp_exc {
95 compat_ulong_t fpexc;
96 compat_ulong_t fpinst;
97 compat_ulong_t fpinst2;
98 } ufp_exc;
99 } __attribute__((__aligned__(8)));
100
101 #define VFP_MAGIC 0x56465001
102 #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe)
103
104 struct compat_aux_sigframe {
105 struct compat_vfp_sigframe vfp;
106
107 /* Something that isn't a valid magic number for any coprocessor. */
108 unsigned long end_magic;
109 } __attribute__((__aligned__(8)));
110
111 struct compat_sigframe {
112 struct compat_ucontext uc;
113 compat_ulong_t retcode[2];
114 };
115
116 struct compat_rt_sigframe {
117 struct compat_siginfo info;
118 struct compat_sigframe sig;
119 };
120
121 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
122
123 /*
124 * For ARM syscalls, the syscall number has to be loaded into r7.
125 * We do not support an OABI userspace.
126 */
127 #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_compat_sigreturn)
128 #define SVC_SYS_SIGRETURN (0xef000000 | __NR_compat_sigreturn)
129 #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_compat_rt_sigreturn)
130 #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_compat_rt_sigreturn)
131
132 /*
133 * For Thumb syscalls, we also pass the syscall number via r7. We therefore
134 * need two 16-bit instructions.
135 */
136 #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_compat_sigreturn) << 16) | \
137 0x2700 | __NR_compat_sigreturn)
138 #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_compat_rt_sigreturn) << 16) | \
139 0x2700 | __NR_compat_rt_sigreturn)
140
141 const compat_ulong_t aarch32_sigret_code[6] = {
142 /*
143 * AArch32 sigreturn code.
144 * We don't construct an OABI SWI - instead we just set the imm24 field
145 * to the EABI syscall number so that we create a sane disassembly.
146 */
147 MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN,
148 MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN,
149 };
150
151 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
152 {
153 compat_sigset_t cset;
154
155 cset.sig[0] = set->sig[0] & 0xffffffffull;
156 cset.sig[1] = set->sig[0] >> 32;
157
158 return copy_to_user(uset, &cset, sizeof(*uset));
159 }
160
161 static inline int get_sigset_t(sigset_t *set,
162 const compat_sigset_t __user *uset)
163 {
164 compat_sigset_t s32;
165
166 if (copy_from_user(&s32, uset, sizeof(*uset)))
167 return -EFAULT;
168
169 set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
170 return 0;
171 }
172
173 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
174 {
175 int err;
176
177 if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
178 return -EFAULT;
179
180 /* If you change siginfo_t structure, please be sure
181 * this code is fixed accordingly.
182 * It should never copy any pad contained in the structure
183 * to avoid security leaks, but must copy the generic
184 * 3 ints plus the relevant union member.
185 * This routine must convert siginfo from 64bit to 32bit as well
186 * at the same time.
187 */
188 err = __put_user(from->si_signo, &to->si_signo);
189 err |= __put_user(from->si_errno, &to->si_errno);
190 err |= __put_user((short)from->si_code, &to->si_code);
191 if (from->si_code < 0)
192 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
193 SI_PAD_SIZE);
194 else switch (from->si_code & __SI_MASK) {
195 case __SI_KILL:
196 err |= __put_user(from->si_pid, &to->si_pid);
197 err |= __put_user(from->si_uid, &to->si_uid);
198 break;
199 case __SI_TIMER:
200 err |= __put_user(from->si_tid, &to->si_tid);
201 err |= __put_user(from->si_overrun, &to->si_overrun);
202 err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr,
203 &to->si_ptr);
204 break;
205 case __SI_POLL:
206 err |= __put_user(from->si_band, &to->si_band);
207 err |= __put_user(from->si_fd, &to->si_fd);
208 break;
209 case __SI_FAULT:
210 err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
211 &to->si_addr);
212 #ifdef BUS_MCEERR_AO
213 /*
214 * Other callers might not initialize the si_lsb field,
215 * so check explicitely for the right codes here.
216 */
217 if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
218 err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
219 #endif
220 break;
221 case __SI_CHLD:
222 err |= __put_user(from->si_pid, &to->si_pid);
223 err |= __put_user(from->si_uid, &to->si_uid);
224 err |= __put_user(from->si_status, &to->si_status);
225 err |= __put_user(from->si_utime, &to->si_utime);
226 err |= __put_user(from->si_stime, &to->si_stime);
227 break;
228 case __SI_RT: /* This is not generated by the kernel as of now. */
229 case __SI_MESGQ: /* But this is */
230 err |= __put_user(from->si_pid, &to->si_pid);
231 err |= __put_user(from->si_uid, &to->si_uid);
232 err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr);
233 break;
234 default: /* this is just in case for now ... */
235 err |= __put_user(from->si_pid, &to->si_pid);
236 err |= __put_user(from->si_uid, &to->si_uid);
237 break;
238 }
239 return err;
240 }
241
242 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
243 {
244 memset(to, 0, sizeof *to);
245
246 if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
247 copy_from_user(to->_sifields._pad,
248 from->_sifields._pad, SI_PAD_SIZE))
249 return -EFAULT;
250
251 return 0;
252 }
253
254 /*
255 * VFP save/restore code.
256 */
257 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
258 {
259 struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
260 compat_ulong_t magic = VFP_MAGIC;
261 compat_ulong_t size = VFP_STORAGE_SIZE;
262 compat_ulong_t fpscr, fpexc;
263 int err = 0;
264
265 /*
266 * Save the hardware registers to the fpsimd_state structure.
267 * Note that this also saves V16-31, which aren't visible
268 * in AArch32.
269 */
270 fpsimd_save_state(fpsimd);
271
272 /* Place structure header on the stack */
273 __put_user_error(magic, &frame->magic, err);
274 __put_user_error(size, &frame->size, err);
275
276 /*
277 * Now copy the FP registers. Since the registers are packed,
278 * we can copy the prefix we want (V0-V15) as it is.
279 * FIXME: Won't work if big endian.
280 */
281 err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
282 sizeof(frame->ufp.fpregs));
283
284 /* Create an AArch32 fpscr from the fpsr and the fpcr. */
285 fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
286 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
287 __put_user_error(fpscr, &frame->ufp.fpscr, err);
288
289 /*
290 * The exception register aren't available so we fake up a
291 * basic FPEXC and zero everything else.
292 */
293 fpexc = (1 << 30);
294 __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
295 __put_user_error(0, &frame->ufp_exc.fpinst, err);
296 __put_user_error(0, &frame->ufp_exc.fpinst2, err);
297
298 return err ? -EFAULT : 0;
299 }
300
301 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
302 {
303 struct fpsimd_state fpsimd;
304 compat_ulong_t magic = VFP_MAGIC;
305 compat_ulong_t size = VFP_STORAGE_SIZE;
306 compat_ulong_t fpscr;
307 int err = 0;
308
309 __get_user_error(magic, &frame->magic, err);
310 __get_user_error(size, &frame->size, err);
311
312 if (err)
313 return -EFAULT;
314 if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
315 return -EINVAL;
316
317 /*
318 * Copy the FP registers into the start of the fpsimd_state.
319 * FIXME: Won't work if big endian.
320 */
321 err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
322 sizeof(frame->ufp.fpregs));
323
324 /* Extract the fpsr and the fpcr from the fpscr */
325 __get_user_error(fpscr, &frame->ufp.fpscr, err);
326 fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
327 fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
328
329 /*
330 * We don't need to touch the exception register, so
331 * reload the hardware state.
332 */
333 if (!err) {
334 preempt_disable();
335 fpsimd_load_state(&fpsimd);
336 preempt_enable();
337 }
338
339 return err ? -EFAULT : 0;
340 }
341
342 /*
343 * atomically swap in the new signal mask, and wait for a signal.
344 */
345 asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
346 compat_old_sigset_t mask)
347 {
348 sigset_t blocked;
349
350 siginitset(&current->blocked, mask);
351 return sigsuspend(&blocked);
352 }
353
354 asmlinkage int compat_sys_sigaction(int sig,
355 const struct compat_old_sigaction __user *act,
356 struct compat_old_sigaction __user *oact)
357 {
358 struct k_sigaction new_ka, old_ka;
359 int ret;
360 compat_old_sigset_t mask;
361 compat_uptr_t handler, restorer;
362
363 if (act) {
364 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
365 __get_user(handler, &act->sa_handler) ||
366 __get_user(restorer, &act->sa_restorer) ||
367 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
368 __get_user(mask, &act->sa_mask))
369 return -EFAULT;
370
371 new_ka.sa.sa_handler = compat_ptr(handler);
372 new_ka.sa.sa_restorer = compat_ptr(restorer);
373 siginitset(&new_ka.sa.sa_mask, mask);
374 }
375
376 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
377
378 if (!ret && oact) {
379 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
380 __put_user(ptr_to_compat(old_ka.sa.sa_handler),
381 &oact->sa_handler) ||
382 __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
383 &oact->sa_restorer) ||
384 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
385 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
386 return -EFAULT;
387 }
388
389 return ret;
390 }
391
392 asmlinkage int compat_sys_rt_sigaction(int sig,
393 const struct compat_sigaction __user *act,
394 struct compat_sigaction __user *oact,
395 compat_size_t sigsetsize)
396 {
397 struct k_sigaction new_ka, old_ka;
398 int ret;
399
400 /* XXX: Don't preclude handling different sized sigset_t's. */
401 if (sigsetsize != sizeof(compat_sigset_t))
402 return -EINVAL;
403
404 if (act) {
405 compat_uptr_t handler, restorer;
406
407 ret = get_user(handler, &act->sa_handler);
408 new_ka.sa.sa_handler = compat_ptr(handler);
409 ret |= get_user(restorer, &act->sa_restorer);
410 new_ka.sa.sa_restorer = compat_ptr(restorer);
411 ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
412 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
413 if (ret)
414 return -EFAULT;
415 }
416
417 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
418 if (!ret && oact) {
419 ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
420 ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
421 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
422 }
423 return ret;
424 }
425
426 int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
427 compat_ulong_t sp)
428 {
429 compat_stack_t __user *newstack = compat_ptr(compat_uss);
430 compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
431 compat_uptr_t ss_sp;
432 int ret;
433 mm_segment_t old_fs;
434 stack_t uss, uoss;
435
436 /* Marshall the compat new stack into a stack_t */
437 if (newstack) {
438 if (get_user(ss_sp, &newstack->ss_sp) ||
439 __get_user(uss.ss_flags, &newstack->ss_flags) ||
440 __get_user(uss.ss_size, &newstack->ss_size))
441 return -EFAULT;
442 uss.ss_sp = compat_ptr(ss_sp);
443 }
444
445 old_fs = get_fs();
446 set_fs(KERNEL_DS);
447 /* The __user pointer casts are valid because of the set_fs() */
448 ret = do_sigaltstack(
449 newstack ? (stack_t __user *) &uss : NULL,
450 oldstack ? (stack_t __user *) &uoss : NULL,
451 (unsigned long)sp);
452 set_fs(old_fs);
453
454 /* Convert the old stack_t into a compat stack. */
455 if (!ret && oldstack &&
456 (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
457 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
458 __put_user(uoss.ss_size, &oldstack->ss_size)))
459 return -EFAULT;
460 return ret;
461 }
462
463 static int compat_restore_sigframe(struct pt_regs *regs,
464 struct compat_sigframe __user *sf)
465 {
466 int err;
467 sigset_t set;
468 struct compat_aux_sigframe __user *aux;
469
470 err = get_sigset_t(&set, &sf->uc.uc_sigmask);
471 if (err == 0) {
472 sigdelsetmask(&set, ~_BLOCKABLE);
473 set_current_blocked(&set);
474 }
475
476 __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
477 __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
478 __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
479 __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
480 __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
481 __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
482 __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
483 __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
484 __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
485 __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
486 __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
487 __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
488 __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
489 __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
490 __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
491 __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
492 __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
493
494 /*
495 * Avoid compat_sys_sigreturn() restarting.
496 */
497 regs->syscallno = ~0UL;
498
499 err |= !valid_user_regs(&regs->user_regs);
500
501 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
502 if (err == 0)
503 err |= compat_restore_vfp_context(&aux->vfp);
504
505 return err;
506 }
507
508 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
509 {
510 struct compat_sigframe __user *frame;
511
512 /* Always make any pending restarted system calls return -EINTR */
513 current_thread_info()->restart_block.fn = do_no_restart_syscall;
514
515 /*
516 * Since we stacked the signal on a 64-bit boundary,
517 * then 'sp' should be word aligned here. If it's
518 * not, then the user is trying to mess with us.
519 */
520 if (regs->compat_sp & 7)
521 goto badframe;
522
523 frame = (struct compat_sigframe __user *)regs->compat_sp;
524
525 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
526 goto badframe;
527
528 if (compat_restore_sigframe(regs, frame))
529 goto badframe;
530
531 return regs->regs[0];
532
533 badframe:
534 if (show_unhandled_signals)
535 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
536 current->comm, task_pid_nr(current), __func__,
537 regs->pc, regs->sp);
538 force_sig(SIGSEGV, current);
539 return 0;
540 }
541
542 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
543 {
544 struct compat_rt_sigframe __user *frame;
545
546 /* Always make any pending restarted system calls return -EINTR */
547 current_thread_info()->restart_block.fn = do_no_restart_syscall;
548
549 /*
550 * Since we stacked the signal on a 64-bit boundary,
551 * then 'sp' should be word aligned here. If it's
552 * not, then the user is trying to mess with us.
553 */
554 if (regs->compat_sp & 7)
555 goto badframe;
556
557 frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
558
559 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
560 goto badframe;
561
562 if (compat_restore_sigframe(regs, &frame->sig))
563 goto badframe;
564
565 if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
566 ptr_to_compat((void __user *)NULL),
567 regs->compat_sp) == -EFAULT)
568 goto badframe;
569
570 return regs->regs[0];
571
572 badframe:
573 if (show_unhandled_signals)
574 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
575 current->comm, task_pid_nr(current), __func__,
576 regs->pc, regs->sp);
577 force_sig(SIGSEGV, current);
578 return 0;
579 }
580
581 static void __user *compat_get_sigframe(struct k_sigaction *ka,
582 struct pt_regs *regs,
583 int framesize)
584 {
585 compat_ulong_t sp = regs->compat_sp;
586 void __user *frame;
587
588 /*
589 * This is the X/Open sanctioned signal stack switching.
590 */
591 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
592 sp = current->sas_ss_sp + current->sas_ss_size;
593
594 /*
595 * ATPCS B01 mandates 8-byte alignment
596 */
597 frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
598
599 /*
600 * Check that we can actually write to the signal frame.
601 */
602 if (!access_ok(VERIFY_WRITE, frame, framesize))
603 frame = NULL;
604
605 return frame;
606 }
607
608 static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
609 compat_ulong_t __user *rc, void __user *frame,
610 int usig)
611 {
612 compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
613 compat_ulong_t retcode;
614 compat_ulong_t spsr = regs->pstate & ~PSR_f;
615 int thumb;
616
617 /* Check if the handler is written for ARM or Thumb */
618 thumb = handler & 1;
619
620 if (thumb) {
621 spsr |= COMPAT_PSR_T_BIT;
622 spsr &= ~COMPAT_PSR_IT_MASK;
623 } else {
624 spsr &= ~COMPAT_PSR_T_BIT;
625 }
626
627 if (ka->sa.sa_flags & SA_RESTORER) {
628 retcode = ptr_to_compat(ka->sa.sa_restorer);
629 } else {
630 /* Set up sigreturn pointer */
631 unsigned int idx = thumb << 1;
632
633 if (ka->sa.sa_flags & SA_SIGINFO)
634 idx += 3;
635
636 retcode = AARCH32_VECTORS_BASE +
637 AARCH32_KERN_SIGRET_CODE_OFFSET +
638 (idx << 2) + thumb;
639 }
640
641 regs->regs[0] = usig;
642 regs->compat_sp = ptr_to_compat(frame);
643 regs->compat_lr = retcode;
644 regs->pc = handler;
645 regs->pstate = spsr;
646 }
647
648 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
649 struct pt_regs *regs, sigset_t *set)
650 {
651 struct compat_aux_sigframe __user *aux;
652 int err = 0;
653
654 __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
655 __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
656 __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
657 __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
658 __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
659 __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
660 __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
661 __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
662 __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
663 __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
664 __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
665 __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
666 __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
667 __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
668 __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
669 __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
670 __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
671
672 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
673 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err);
674 __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
675 __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
676
677 err |= put_sigset_t(&sf->uc.uc_sigmask, set);
678
679 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
680
681 if (err == 0)
682 err |= compat_preserve_vfp_context(&aux->vfp);
683 __put_user_error(0, &aux->end_magic, err);
684
685 return err;
686 }
687
688 /*
689 * 32-bit signal handling routines called from signal.c
690 */
691 int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
692 sigset_t *set, struct pt_regs *regs)
693 {
694 struct compat_rt_sigframe __user *frame;
695 compat_stack_t stack;
696 int err = 0;
697
698 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
699
700 if (!frame)
701 return 1;
702
703 err |= copy_siginfo_to_user32(&frame->info, info);
704
705 __put_user_error(0, &frame->sig.uc.uc_flags, err);
706 __put_user_error(NULL, &frame->sig.uc.uc_link, err);
707
708 memset(&stack, 0, sizeof(stack));
709 stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
710 stack.ss_flags = sas_ss_flags(regs->compat_sp);
711 stack.ss_size = current->sas_ss_size;
712 err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
713
714 err |= compat_setup_sigframe(&frame->sig, regs, set);
715
716 if (err == 0) {
717 compat_setup_return(regs, ka, frame->sig.retcode, frame, usig);
718 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
719 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
720 }
721
722 return err;
723 }
724
725 int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
726 struct pt_regs *regs)
727 {
728 struct compat_sigframe __user *frame;
729 int err = 0;
730
731 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
732
733 if (!frame)
734 return 1;
735
736 __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
737
738 err |= compat_setup_sigframe(frame, regs, set);
739 if (err == 0)
740 compat_setup_return(regs, ka, frame->retcode, frame, usig);
741
742 return err;
743 }
744
745 /*
746 * RT signals don't have generic compat wrappers.
747 * See arch/powerpc/kernel/signal_32.c
748 */
749 asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
750 compat_sigset_t __user *oset,
751 compat_size_t sigsetsize)
752 {
753 sigset_t s;
754 sigset_t __user *up;
755 int ret;
756 mm_segment_t old_fs = get_fs();
757
758 if (set) {
759 if (get_sigset_t(&s, set))
760 return -EFAULT;
761 }
762
763 set_fs(KERNEL_DS);
764 /* This is valid because of the set_fs() */
765 up = (sigset_t __user *) &s;
766 ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL,
767 sigsetsize);
768 set_fs(old_fs);
769 if (ret)
770 return ret;
771 if (oset) {
772 if (put_sigset_t(oset, &s))
773 return -EFAULT;
774 }
775 return 0;
776 }
777
778 asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set,
779 compat_size_t sigsetsize)
780 {
781 sigset_t s;
782 int ret;
783 mm_segment_t old_fs = get_fs();
784
785 set_fs(KERNEL_DS);
786 /* The __user pointer cast is valid because of the set_fs() */
787 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
788 set_fs(old_fs);
789 if (!ret) {
790 if (put_sigset_t(set, &s))
791 return -EFAULT;
792 }
793 return ret;
794 }
795
796 asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig,
797 compat_siginfo_t __user *uinfo)
798 {
799 siginfo_t info;
800 int ret;
801 mm_segment_t old_fs = get_fs();
802
803 ret = copy_siginfo_from_user32(&info, uinfo);
804 if (unlikely(ret))
805 return ret;
806
807 set_fs (KERNEL_DS);
808 /* The __user pointer cast is valid because of the set_fs() */
809 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
810 set_fs (old_fs);
811 return ret;
812 }
813
814 void compat_setup_restart_syscall(struct pt_regs *regs)
815 {
816 regs->regs[7] = __NR_compat_restart_syscall;
817 }