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Linux 3.12.39
[linux/fpc-iii.git] / arch / arm64 / kernel / signal32.c
blob3d478102b1c015df01f7083ac6e3eb47022b2a00
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_sigcontext {
32 /* We always set these two fields to 0 */
33 compat_ulong_t trap_no;
34 compat_ulong_t error_code;
35
36 compat_ulong_t oldmask;
37 compat_ulong_t arm_r0;
38 compat_ulong_t arm_r1;
39 compat_ulong_t arm_r2;
40 compat_ulong_t arm_r3;
41 compat_ulong_t arm_r4;
42 compat_ulong_t arm_r5;
43 compat_ulong_t arm_r6;
44 compat_ulong_t arm_r7;
45 compat_ulong_t arm_r8;
46 compat_ulong_t arm_r9;
47 compat_ulong_t arm_r10;
48 compat_ulong_t arm_fp;
49 compat_ulong_t arm_ip;
50 compat_ulong_t arm_sp;
51 compat_ulong_t arm_lr;
52 compat_ulong_t arm_pc;
53 compat_ulong_t arm_cpsr;
54 compat_ulong_t fault_address;
55 };
56
57 struct compat_ucontext {
58 compat_ulong_t uc_flags;
59 compat_uptr_t uc_link;
60 compat_stack_t uc_stack;
61 struct compat_sigcontext uc_mcontext;
62 compat_sigset_t uc_sigmask;
63 int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))];
64 compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8)));
65 };
66
67 struct compat_vfp_sigframe {
68 compat_ulong_t magic;
69 compat_ulong_t size;
70 struct compat_user_vfp {
71 compat_u64 fpregs[32];
72 compat_ulong_t fpscr;
73 } ufp;
74 struct compat_user_vfp_exc {
75 compat_ulong_t fpexc;
76 compat_ulong_t fpinst;
77 compat_ulong_t fpinst2;
78 } ufp_exc;
79 } __attribute__((__aligned__(8)));
80
81 #define VFP_MAGIC 0x56465001
82 #define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe)
83
84 struct compat_aux_sigframe {
85 struct compat_vfp_sigframe vfp;
86
87 /* Something that isn't a valid magic number for any coprocessor. */
88 unsigned long end_magic;
89 } __attribute__((__aligned__(8)));
90
91 struct compat_sigframe {
92 struct compat_ucontext uc;
93 compat_ulong_t retcode[2];
94 };
95
96 struct compat_rt_sigframe {
97 struct compat_siginfo info;
98 struct compat_sigframe sig;
99 };
100
101 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
102
103 /*
104 * For ARM syscalls, the syscall number has to be loaded into r7.
105 * We do not support an OABI userspace.
106 */
107 #define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_compat_sigreturn)
108 #define SVC_SYS_SIGRETURN (0xef000000 | __NR_compat_sigreturn)
109 #define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_compat_rt_sigreturn)
110 #define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_compat_rt_sigreturn)
111
112 /*
113 * For Thumb syscalls, we also pass the syscall number via r7. We therefore
114 * need two 16-bit instructions.
115 */
116 #define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_compat_sigreturn) << 16) | \
117 0x2700 | __NR_compat_sigreturn)
118 #define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_compat_rt_sigreturn) << 16) | \
119 0x2700 | __NR_compat_rt_sigreturn)
120
121 const compat_ulong_t aarch32_sigret_code[6] = {
122 /*
123 * AArch32 sigreturn code.
124 * We don't construct an OABI SWI - instead we just set the imm24 field
125 * to the EABI syscall number so that we create a sane disassembly.
126 */
127 MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN,
128 MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN,
129 };
130
131 static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
132 {
133 compat_sigset_t cset;
134
135 cset.sig[0] = set->sig[0] & 0xffffffffull;
136 cset.sig[1] = set->sig[0] >> 32;
137
138 return copy_to_user(uset, &cset, sizeof(*uset));
139 }
140
141 static inline int get_sigset_t(sigset_t *set,
142 const compat_sigset_t __user *uset)
143 {
144 compat_sigset_t s32;
145
146 if (copy_from_user(&s32, uset, sizeof(*uset)))
147 return -EFAULT;
148
149 set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
150 return 0;
151 }
152
153 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
154 {
155 int err;
156
157 if (!access_ok(VERIFY_WRITE, to, sizeof(*to)))
158 return -EFAULT;
159
160 /* If you change siginfo_t structure, please be sure
161 * this code is fixed accordingly.
162 * It should never copy any pad contained in the structure
163 * to avoid security leaks, but must copy the generic
164 * 3 ints plus the relevant union member.
165 * This routine must convert siginfo from 64bit to 32bit as well
166 * at the same time.
167 */
168 err = __put_user(from->si_signo, &to->si_signo);
169 err |= __put_user(from->si_errno, &to->si_errno);
170 err |= __put_user((short)from->si_code, &to->si_code);
171 if (from->si_code < 0)
172 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad,
173 SI_PAD_SIZE);
174 else switch (from->si_code & __SI_MASK) {
175 case __SI_KILL:
176 err |= __put_user(from->si_pid, &to->si_pid);
177 err |= __put_user(from->si_uid, &to->si_uid);
178 break;
179 case __SI_TIMER:
180 err |= __put_user(from->si_tid, &to->si_tid);
181 err |= __put_user(from->si_overrun, &to->si_overrun);
182 err |= __put_user(from->si_int, &to->si_int);
183 break;
184 case __SI_POLL:
185 err |= __put_user(from->si_band, &to->si_band);
186 err |= __put_user(from->si_fd, &to->si_fd);
187 break;
188 case __SI_FAULT:
189 err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr,
190 &to->si_addr);
191 #ifdef BUS_MCEERR_AO
192 /*
193 * Other callers might not initialize the si_lsb field,
194 * so check explicitely for the right codes here.
195 */
196 if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO)
197 err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb);
198 #endif
199 break;
200 case __SI_CHLD:
201 err |= __put_user(from->si_pid, &to->si_pid);
202 err |= __put_user(from->si_uid, &to->si_uid);
203 err |= __put_user(from->si_status, &to->si_status);
204 err |= __put_user(from->si_utime, &to->si_utime);
205 err |= __put_user(from->si_stime, &to->si_stime);
206 break;
207 case __SI_RT: /* This is not generated by the kernel as of now. */
208 case __SI_MESGQ: /* But this is */
209 err |= __put_user(from->si_pid, &to->si_pid);
210 err |= __put_user(from->si_uid, &to->si_uid);
211 err |= __put_user(from->si_int, &to->si_int);
212 break;
213 default: /* this is just in case for now ... */
214 err |= __put_user(from->si_pid, &to->si_pid);
215 err |= __put_user(from->si_uid, &to->si_uid);
216 break;
217 }
218 return err;
219 }
220
221 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
222 {
223 memset(to, 0, sizeof *to);
224
225 if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) ||
226 copy_from_user(to->_sifields._pad,
227 from->_sifields._pad, SI_PAD_SIZE))
228 return -EFAULT;
229
230 return 0;
231 }
232
233 /*
234 * VFP save/restore code.
235 */
236 static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame)
237 {
238 struct fpsimd_state *fpsimd = &current->thread.fpsimd_state;
239 compat_ulong_t magic = VFP_MAGIC;
240 compat_ulong_t size = VFP_STORAGE_SIZE;
241 compat_ulong_t fpscr, fpexc;
242 int err = 0;
243
244 /*
245 * Save the hardware registers to the fpsimd_state structure.
246 * Note that this also saves V16-31, which aren't visible
247 * in AArch32.
248 */
249 fpsimd_save_state(fpsimd);
250
251 /* Place structure header on the stack */
252 __put_user_error(magic, &frame->magic, err);
253 __put_user_error(size, &frame->size, err);
254
255 /*
256 * Now copy the FP registers. Since the registers are packed,
257 * we can copy the prefix we want (V0-V15) as it is.
258 * FIXME: Won't work if big endian.
259 */
260 err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs,
261 sizeof(frame->ufp.fpregs));
262
263 /* Create an AArch32 fpscr from the fpsr and the fpcr. */
264 fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) |
265 (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK);
266 __put_user_error(fpscr, &frame->ufp.fpscr, err);
267
268 /*
269 * The exception register aren't available so we fake up a
270 * basic FPEXC and zero everything else.
271 */
272 fpexc = (1 << 30);
273 __put_user_error(fpexc, &frame->ufp_exc.fpexc, err);
274 __put_user_error(0, &frame->ufp_exc.fpinst, err);
275 __put_user_error(0, &frame->ufp_exc.fpinst2, err);
276
277 return err ? -EFAULT : 0;
278 }
279
280 static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
281 {
282 struct fpsimd_state fpsimd;
283 compat_ulong_t magic = VFP_MAGIC;
284 compat_ulong_t size = VFP_STORAGE_SIZE;
285 compat_ulong_t fpscr;
286 int err = 0;
287
288 __get_user_error(magic, &frame->magic, err);
289 __get_user_error(size, &frame->size, err);
290
291 if (err)
292 return -EFAULT;
293 if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
294 return -EINVAL;
295
296 /*
297 * Copy the FP registers into the start of the fpsimd_state.
298 * FIXME: Won't work if big endian.
299 */
300 err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs,
301 sizeof(frame->ufp.fpregs));
302
303 /* Extract the fpsr and the fpcr from the fpscr */
304 __get_user_error(fpscr, &frame->ufp.fpscr, err);
305 fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK;
306 fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
307
308 /*
309 * We don't need to touch the exception register, so
310 * reload the hardware state.
311 */
312 if (!err) {
313 preempt_disable();
314 fpsimd_load_state(&fpsimd);
315 preempt_enable();
316 }
317
318 return err ? -EFAULT : 0;
319 }
320
321 static int compat_restore_sigframe(struct pt_regs *regs,
322 struct compat_sigframe __user *sf)
323 {
324 int err;
325 sigset_t set;
326 struct compat_aux_sigframe __user *aux;
327
328 err = get_sigset_t(&set, &sf->uc.uc_sigmask);
329 if (err == 0) {
330 sigdelsetmask(&set, ~_BLOCKABLE);
331 set_current_blocked(&set);
332 }
333
334 __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
335 __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
336 __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
337 __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
338 __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
339 __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
340 __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
341 __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
342 __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
343 __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
344 __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
345 __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
346 __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
347 __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
348 __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
349 __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
350 __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
351
352 /*
353 * Avoid compat_sys_sigreturn() restarting.
354 */
355 regs->syscallno = ~0UL;
356
357 err |= !valid_user_regs(&regs->user_regs);
358
359 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
360 if (err == 0)
361 err |= compat_restore_vfp_context(&aux->vfp);
362
363 return err;
364 }
365
366 asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
367 {
368 struct compat_sigframe __user *frame;
369
370 /* Always make any pending restarted system calls return -EINTR */
371 current_thread_info()->restart_block.fn = do_no_restart_syscall;
372
373 /*
374 * Since we stacked the signal on a 64-bit boundary,
375 * then 'sp' should be word aligned here. If it's
376 * not, then the user is trying to mess with us.
377 */
378 if (regs->compat_sp & 7)
379 goto badframe;
380
381 frame = (struct compat_sigframe __user *)regs->compat_sp;
382
383 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
384 goto badframe;
385
386 if (compat_restore_sigframe(regs, frame))
387 goto badframe;
388
389 return regs->regs[0];
390
391 badframe:
392 if (show_unhandled_signals)
393 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
394 current->comm, task_pid_nr(current), __func__,
395 regs->pc, regs->sp);
396 force_sig(SIGSEGV, current);
397 return 0;
398 }
399
400 asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
401 {
402 struct compat_rt_sigframe __user *frame;
403
404 /* Always make any pending restarted system calls return -EINTR */
405 current_thread_info()->restart_block.fn = do_no_restart_syscall;
406
407 /*
408 * Since we stacked the signal on a 64-bit boundary,
409 * then 'sp' should be word aligned here. If it's
410 * not, then the user is trying to mess with us.
411 */
412 if (regs->compat_sp & 7)
413 goto badframe;
414
415 frame = (struct compat_rt_sigframe __user *)regs->compat_sp;
416
417 if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
418 goto badframe;
419
420 if (compat_restore_sigframe(regs, &frame->sig))
421 goto badframe;
422
423 if (compat_restore_altstack(&frame->sig.uc.uc_stack))
424 goto badframe;
425
426 return regs->regs[0];
427
428 badframe:
429 if (show_unhandled_signals)
430 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
431 current->comm, task_pid_nr(current), __func__,
432 regs->pc, regs->sp);
433 force_sig(SIGSEGV, current);
434 return 0;
435 }
436
437 static void __user *compat_get_sigframe(struct k_sigaction *ka,
438 struct pt_regs *regs,
439 int framesize)
440 {
441 compat_ulong_t sp = regs->compat_sp;
442 void __user *frame;
443
444 /*
445 * This is the X/Open sanctioned signal stack switching.
446 */
447 if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
448 sp = current->sas_ss_sp + current->sas_ss_size;
449
450 /*
451 * ATPCS B01 mandates 8-byte alignment
452 */
453 frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7));
454
455 /*
456 * Check that we can actually write to the signal frame.
457 */
458 if (!access_ok(VERIFY_WRITE, frame, framesize))
459 frame = NULL;
460
461 return frame;
462 }
463
464 static void compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka,
465 compat_ulong_t __user *rc, void __user *frame,
466 int usig)
467 {
468 compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler);
469 compat_ulong_t retcode;
470 compat_ulong_t spsr = regs->pstate & ~PSR_f;
471 int thumb;
472
473 /* Check if the handler is written for ARM or Thumb */
474 thumb = handler & 1;
475
476 if (thumb) {
477 spsr |= COMPAT_PSR_T_BIT;
478 spsr &= ~COMPAT_PSR_IT_MASK;
479 } else {
480 spsr &= ~COMPAT_PSR_T_BIT;
481 }
482
483 if (ka->sa.sa_flags & SA_RESTORER) {
484 retcode = ptr_to_compat(ka->sa.sa_restorer);
485 } else {
486 /* Set up sigreturn pointer */
487 unsigned int idx = thumb << 1;
488
489 if (ka->sa.sa_flags & SA_SIGINFO)
490 idx += 3;
491
492 retcode = AARCH32_VECTORS_BASE +
493 AARCH32_KERN_SIGRET_CODE_OFFSET +
494 (idx << 2) + thumb;
495 }
496
497 regs->regs[0] = usig;
498 regs->compat_sp = ptr_to_compat(frame);
499 regs->compat_lr = retcode;
500 regs->pc = handler;
501 regs->pstate = spsr;
502 }
503
504 static int compat_setup_sigframe(struct compat_sigframe __user *sf,
505 struct pt_regs *regs, sigset_t *set)
506 {
507 struct compat_aux_sigframe __user *aux;
508 int err = 0;
509
510 __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err);
511 __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err);
512 __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err);
513 __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err);
514 __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err);
515 __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err);
516 __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err);
517 __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err);
518 __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err);
519 __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err);
520 __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err);
521 __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err);
522 __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err);
523 __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err);
524 __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err);
525 __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err);
526 __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err);
527
528 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err);
529 __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err);
530 __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
531 __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
532
533 err |= put_sigset_t(&sf->uc.uc_sigmask, set);
534
535 aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace;
536
537 if (err == 0)
538 err |= compat_preserve_vfp_context(&aux->vfp);
539 __put_user_error(0, &aux->end_magic, err);
540
541 return err;
542 }
543
544 /*
545 * 32-bit signal handling routines called from signal.c
546 */
547 int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
548 sigset_t *set, struct pt_regs *regs)
549 {
550 struct compat_rt_sigframe __user *frame;
551 int err = 0;
552
553 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
554
555 if (!frame)
556 return 1;
557
558 err |= copy_siginfo_to_user32(&frame->info, info);
559
560 __put_user_error(0, &frame->sig.uc.uc_flags, err);
561 __put_user_error(0, &frame->sig.uc.uc_link, err);
562
563 err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
564
565 err |= compat_setup_sigframe(&frame->sig, regs, set);
566
567 if (err == 0) {
568 compat_setup_return(regs, ka, frame->sig.retcode, frame, usig);
569 regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info;
570 regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc;
571 }
572
573 return err;
574 }
575
576 int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
577 struct pt_regs *regs)
578 {
579 struct compat_sigframe __user *frame;
580 int err = 0;
581
582 frame = compat_get_sigframe(ka, regs, sizeof(*frame));
583
584 if (!frame)
585 return 1;
586
587 __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
588
589 err |= compat_setup_sigframe(frame, regs, set);
590 if (err == 0)
591 compat_setup_return(regs, ka, frame->retcode, frame, usig);
592
593 return err;
594 }
595
596 void compat_setup_restart_syscall(struct pt_regs *regs)
597 {
598 regs->regs[7] = __NR_compat_restart_syscall;
599 }
Linux with added FPC-III support