1 /* arch/sparc64/kernel/signal32.c
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 */
9
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
12 #include <linux/signal.h>
13 #include <linux/errno.h>
14 #include <linux/wait.h>
15 #include <linux/ptrace.h>
16 #include <linux/unistd.h>
17 #include <linux/mm.h>
18 #include <linux/tty.h>
19 #include <linux/binfmts.h>
20 #include <linux/compat.h>
21 #include <linux/bitops.h>
22 #include <linux/tracehook.h>
23
24 #include <asm/uaccess.h>
25 #include <asm/ptrace.h>
26 #include <asm/pgtable.h>
27 #include <asm/psrcompat.h>
28 #include <asm/fpumacro.h>
29 #include <asm/visasm.h>
30 #include <asm/compat_signal.h>
31
32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
33
34 /* This magic should be in g_upper[0] for all upper parts
35 * to be valid.
36 */
37 #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269
38 typedef struct {
39 unsigned int g_upper[8];
40 unsigned int o_upper[8];
41 unsigned int asi;
42 } siginfo_extra_v8plus_t;
43
44 struct signal_frame32 {
45 struct sparc_stackf32 ss;
46 __siginfo32_t info;
47 /* __siginfo_fpu32_t * */ u32 fpu_save;
48 unsigned int insns[2];
49 unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
50 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
51 /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
52 siginfo_extra_v8plus_t v8plus;
53 __siginfo_fpu_t fpu_state;
54 };
55
56 typedef struct compat_siginfo{
57 int si_signo;
58 int si_errno;
59 int si_code;
60
61 union {
62 int _pad[SI_PAD_SIZE32];
63
64 /* kill() */
65 struct {
66 compat_pid_t _pid; /* sender's pid */
67 unsigned int _uid; /* sender's uid */
68 } _kill;
69
70 /* POSIX.1b timers */
71 struct {
72 compat_timer_t _tid; /* timer id */
73 int _overrun; /* overrun count */
74 compat_sigval_t _sigval; /* same as below */
75 int _sys_private; /* not to be passed to user */
76 } _timer;
77
78 /* POSIX.1b signals */
79 struct {
80 compat_pid_t _pid; /* sender's pid */
81 unsigned int _uid; /* sender's uid */
82 compat_sigval_t _sigval;
83 } _rt;
84
85 /* SIGCHLD */
86 struct {
87 compat_pid_t _pid; /* which child */
88 unsigned int _uid; /* sender's uid */
89 int _status; /* exit code */
90 compat_clock_t _utime;
91 compat_clock_t _stime;
92 } _sigchld;
93
94 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */
95 struct {
96 u32 _addr; /* faulting insn/memory ref. */
97 int _trapno;
98 } _sigfault;
99
100 /* SIGPOLL */
101 struct {
102 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
103 int _fd;
104 } _sigpoll;
105 } _sifields;
106 }compat_siginfo_t;
107
108 struct rt_signal_frame32 {
109 struct sparc_stackf32 ss;
110 compat_siginfo_t info;
111 struct pt_regs32 regs;
112 compat_sigset_t mask;
113 /* __siginfo_fpu32_t * */ u32 fpu_save;
114 unsigned int insns[2];
115 stack_t32 stack;
116 unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */
117 /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */
118 siginfo_extra_v8plus_t v8plus;
119 __siginfo_fpu_t fpu_state;
120 };
121
122 /* Align macros */
123 #define SF_ALIGNEDSZ (((sizeof(struct signal_frame32) + 7) & (~7)))
124 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 7) & (~7)))
125
copy_siginfo_to_user32(compat_siginfo_t __user * to,siginfo_t * from)126 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
127 {
128 int err;
129
130 if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
131 return -EFAULT;
132
133 /* If you change siginfo_t structure, please be sure
134 this code is fixed accordingly.
135 It should never copy any pad contained in the structure
136 to avoid security leaks, but must copy the generic
137 3 ints plus the relevant union member.
138 This routine must convert siginfo from 64bit to 32bit as well
139 at the same time. */
140 err = __put_user(from->si_signo, &to->si_signo);
141 err |= __put_user(from->si_errno, &to->si_errno);
142 err |= __put_user((short)from->si_code, &to->si_code);
143 if (from->si_code < 0)
144 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
145 else {
146 switch (from->si_code >> 16) {
147 case __SI_TIMER >> 16:
148 err |= __put_user(from->si_tid, &to->si_tid);
149 err |= __put_user(from->si_overrun, &to->si_overrun);
150 err |= __put_user(from->si_int, &to->si_int);
151 break;
152 case __SI_CHLD >> 16:
153 err |= __put_user(from->si_utime, &to->si_utime);
154 err |= __put_user(from->si_stime, &to->si_stime);
155 err |= __put_user(from->si_status, &to->si_status);
156 default:
157 err |= __put_user(from->si_pid, &to->si_pid);
158 err |= __put_user(from->si_uid, &to->si_uid);
159 break;
160 case __SI_FAULT >> 16:
161 err |= __put_user(from->si_trapno, &to->si_trapno);
162 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
163 break;
164 case __SI_POLL >> 16:
165 err |= __put_user(from->si_band, &to->si_band);
166 err |= __put_user(from->si_fd, &to->si_fd);
167 break;
168 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
169 case __SI_MESGQ >> 16:
170 err |= __put_user(from->si_pid, &to->si_pid);
171 err |= __put_user(from->si_uid, &to->si_uid);
172 err |= __put_user(from->si_int, &to->si_int);
173 break;
174 }
175 }
176 return err;
177 }
178
179 /* CAUTION: This is just a very minimalist implementation for the
180 * sake of compat_sys_rt_sigqueueinfo()
181 */
copy_siginfo_from_user32(siginfo_t * to,compat_siginfo_t __user * from)182 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
183 {
184 if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t)))
185 return -EFAULT;
186
187 if (copy_from_user(to, from, 3*sizeof(int)) ||
188 copy_from_user(to->_sifields._pad, from->_sifields._pad,
189 SI_PAD_SIZE))
190 return -EFAULT;
191
192 return 0;
193 }
194
restore_fpu_state32(struct pt_regs * regs,__siginfo_fpu_t __user * fpu)195 static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
196 {
197 unsigned long *fpregs = current_thread_info()->fpregs;
198 unsigned long fprs;
199 int err;
200
201 err = __get_user(fprs, &fpu->si_fprs);
202 fprs_write(0);
203 regs->tstate &= ~TSTATE_PEF;
204 if (fprs & FPRS_DL)
205 err |= copy_from_user(fpregs, &fpu->si_float_regs[0], (sizeof(unsigned int) * 32));
206 if (fprs & FPRS_DU)
207 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32], (sizeof(unsigned int) * 32));
208 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
209 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
210 current_thread_info()->fpsaved[0] |= fprs;
211 return err;
212 }
213
do_sigreturn32(struct pt_regs * regs)214 void do_sigreturn32(struct pt_regs *regs)
215 {
216 struct signal_frame32 __user *sf;
217 unsigned int psr;
218 unsigned pc, npc, fpu_save;
219 sigset_t set;
220 unsigned seta[_COMPAT_NSIG_WORDS];
221 int err, i;
222
223 /* Always make any pending restarted system calls return -EINTR */
224 current_thread_info()->restart_block.fn = do_no_restart_syscall;
225
226 synchronize_user_stack();
227
228 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
229 sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
230
231 /* 1. Make sure we are not getting garbage from the user */
232 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
233 (((unsigned long) sf) & 3))
234 goto segv;
235
236 get_user(pc, &sf->info.si_regs.pc);
237 __get_user(npc, &sf->info.si_regs.npc);
238
239 if ((pc | npc) & 3)
240 goto segv;
241
242 if (test_thread_flag(TIF_32BIT)) {
243 pc &= 0xffffffff;
244 npc &= 0xffffffff;
245 }
246 regs->tpc = pc;
247 regs->tnpc = npc;
248
249 /* 2. Restore the state */
250 err = __get_user(regs->y, &sf->info.si_regs.y);
251 err |= __get_user(psr, &sf->info.si_regs.psr);
252
253 for (i = UREG_G1; i <= UREG_I7; i++)
254 err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
255 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
256 err |= __get_user(i, &sf->v8plus.g_upper[0]);
257 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
258 unsigned long asi;
259
260 for (i = UREG_G1; i <= UREG_I7; i++)
261 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
262 err |= __get_user(asi, &sf->v8plus.asi);
263 regs->tstate &= ~TSTATE_ASI;
264 regs->tstate |= ((asi & 0xffUL) << 24UL);
265 }
266 }
267
268 /* User can only change condition codes in %tstate. */
269 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
270 regs->tstate |= psr_to_tstate_icc(psr);
271
272 /* Prevent syscall restart. */
273 pt_regs_clear_syscall(regs);
274
275 err |= __get_user(fpu_save, &sf->fpu_save);
276 if (fpu_save)
277 err |= restore_fpu_state32(regs, &sf->fpu_state);
278 err |= __get_user(seta[0], &sf->info.si_mask);
279 err |= copy_from_user(seta+1, &sf->extramask,
280 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
281 if (err)
282 goto segv;
283 switch (_NSIG_WORDS) {
284 case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
285 case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
286 case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
287 case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
288 }
289 sigdelsetmask(&set, ~_BLOCKABLE);
290 spin_lock_irq(¤t->sighand->siglock);
291 current->blocked = set;
292 recalc_sigpending();
293 spin_unlock_irq(¤t->sighand->siglock);
294 return;
295
296 segv:
297 force_sig(SIGSEGV, current);
298 }
299
do_rt_sigreturn32(struct pt_regs * regs)300 asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
301 {
302 struct rt_signal_frame32 __user *sf;
303 unsigned int psr, pc, npc, fpu_save, u_ss_sp;
304 mm_segment_t old_fs;
305 sigset_t set;
306 compat_sigset_t seta;
307 stack_t st;
308 int err, i;
309
310 /* Always make any pending restarted system calls return -EINTR */
311 current_thread_info()->restart_block.fn = do_no_restart_syscall;
312
313 synchronize_user_stack();
314 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
315 sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
316
317 /* 1. Make sure we are not getting garbage from the user */
318 if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
319 (((unsigned long) sf) & 3))
320 goto segv;
321
322 get_user(pc, &sf->regs.pc);
323 __get_user(npc, &sf->regs.npc);
324
325 if ((pc | npc) & 3)
326 goto segv;
327
328 if (test_thread_flag(TIF_32BIT)) {
329 pc &= 0xffffffff;
330 npc &= 0xffffffff;
331 }
332 regs->tpc = pc;
333 regs->tnpc = npc;
334
335 /* 2. Restore the state */
336 err = __get_user(regs->y, &sf->regs.y);
337 err |= __get_user(psr, &sf->regs.psr);
338
339 for (i = UREG_G1; i <= UREG_I7; i++)
340 err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]);
341 if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) {
342 err |= __get_user(i, &sf->v8plus.g_upper[0]);
343 if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) {
344 unsigned long asi;
345
346 for (i = UREG_G1; i <= UREG_I7; i++)
347 err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]);
348 err |= __get_user(asi, &sf->v8plus.asi);
349 regs->tstate &= ~TSTATE_ASI;
350 regs->tstate |= ((asi & 0xffUL) << 24UL);
351 }
352 }
353
354 /* User can only change condition codes in %tstate. */
355 regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
356 regs->tstate |= psr_to_tstate_icc(psr);
357
358 /* Prevent syscall restart. */
359 pt_regs_clear_syscall(regs);
360
361 err |= __get_user(fpu_save, &sf->fpu_save);
362 if (fpu_save)
363 err |= restore_fpu_state32(regs, &sf->fpu_state);
364 err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t));
365 err |= __get_user(u_ss_sp, &sf->stack.ss_sp);
366 st.ss_sp = compat_ptr(u_ss_sp);
367 err |= __get_user(st.ss_flags, &sf->stack.ss_flags);
368 err |= __get_user(st.ss_size, &sf->stack.ss_size);
369 if (err)
370 goto segv;
371
372 /* It is more difficult to avoid calling this function than to
373 call it and ignore errors. */
374 old_fs = get_fs();
375 set_fs(KERNEL_DS);
376 do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf);
377 set_fs(old_fs);
378
379 switch (_NSIG_WORDS) {
380 case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32);
381 case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32);
382 case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32);
383 case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32);
384 }
385 sigdelsetmask(&set, ~_BLOCKABLE);
386 spin_lock_irq(¤t->sighand->siglock);
387 current->blocked = set;
388 recalc_sigpending();
389 spin_unlock_irq(¤t->sighand->siglock);
390 return;
391 segv:
392 force_sig(SIGSEGV, current);
393 }
394
395 /* Checks if the fp is valid */
invalid_frame_pointer(void __user * fp,int fplen)396 static int invalid_frame_pointer(void __user *fp, int fplen)
397 {
398 if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
399 return 1;
400 return 0;
401 }
402
get_sigframe(struct sigaction * sa,struct pt_regs * regs,unsigned long framesize)403 static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
404 {
405 unsigned long sp;
406
407 regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
408 sp = regs->u_regs[UREG_FP];
409
410 /*
411 * If we are on the alternate signal stack and would overflow it, don't.
412 * Return an always-bogus address instead so we will die with SIGSEGV.
413 */
414 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
415 return (void __user *) -1L;
416
417 /* This is the X/Open sanctioned signal stack switching. */
418 if (sa->sa_flags & SA_ONSTACK) {
419 if (sas_ss_flags(sp) == 0)
420 sp = current->sas_ss_sp + current->sas_ss_size;
421 }
422
423 /* Always align the stack frame. This handles two cases. First,
424 * sigaltstack need not be mindful of platform specific stack
425 * alignment. Second, if we took this signal because the stack
426 * is not aligned properly, we'd like to take the signal cleanly
427 * and report that.
428 */
429 sp &= ~7UL;
430
431 return (void __user *)(sp - framesize);
432 }
433
save_fpu_state32(struct pt_regs * regs,__siginfo_fpu_t __user * fpu)434 static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
435 {
436 unsigned long *fpregs = current_thread_info()->fpregs;
437 unsigned long fprs;
438 int err = 0;
439
440 fprs = current_thread_info()->fpsaved[0];
441 if (fprs & FPRS_DL)
442 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
443 (sizeof(unsigned int) * 32));
444 if (fprs & FPRS_DU)
445 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
446 (sizeof(unsigned int) * 32));
447 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
448 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
449 err |= __put_user(fprs, &fpu->si_fprs);
450
451 return err;
452 }
453
setup_frame32(struct k_sigaction * ka,struct pt_regs * regs,int signo,sigset_t * oldset)454 static void setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
455 int signo, sigset_t *oldset)
456 {
457 struct signal_frame32 __user *sf;
458 int sigframe_size;
459 u32 psr;
460 int i, err;
461 unsigned int seta[_COMPAT_NSIG_WORDS];
462
463 /* 1. Make sure everything is clean */
464 synchronize_user_stack();
465 save_and_clear_fpu();
466
467 sigframe_size = SF_ALIGNEDSZ;
468 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
469 sigframe_size -= sizeof(__siginfo_fpu_t);
470
471 sf = (struct signal_frame32 __user *)
472 get_sigframe(&ka->sa, regs, sigframe_size);
473
474 if (invalid_frame_pointer(sf, sigframe_size))
475 goto sigill;
476
477 if (get_thread_wsaved() != 0)
478 goto sigill;
479
480 /* 2. Save the current process state */
481 if (test_thread_flag(TIF_32BIT)) {
482 regs->tpc &= 0xffffffff;
483 regs->tnpc &= 0xffffffff;
484 }
485 err = put_user(regs->tpc, &sf->info.si_regs.pc);
486 err |= __put_user(regs->tnpc, &sf->info.si_regs.npc);
487 err |= __put_user(regs->y, &sf->info.si_regs.y);
488 psr = tstate_to_psr(regs->tstate);
489 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
490 psr |= PSR_EF;
491 err |= __put_user(psr, &sf->info.si_regs.psr);
492 for (i = 0; i < 16; i++)
493 err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]);
494 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
495 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
496 for (i = 1; i < 16; i++)
497 err |= __put_user(((u32 *)regs->u_regs)[2*i],
498 &sf->v8plus.g_upper[i]);
499 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
500 &sf->v8plus.asi);
501
502 if (psr & PSR_EF) {
503 err |= save_fpu_state32(regs, &sf->fpu_state);
504 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
505 } else {
506 err |= __put_user(0, &sf->fpu_save);
507 }
508
509 switch (_NSIG_WORDS) {
510 case 4: seta[7] = (oldset->sig[3] >> 32);
511 seta[6] = oldset->sig[3];
512 case 3: seta[5] = (oldset->sig[2] >> 32);
513 seta[4] = oldset->sig[2];
514 case 2: seta[3] = (oldset->sig[1] >> 32);
515 seta[2] = oldset->sig[1];
516 case 1: seta[1] = (oldset->sig[0] >> 32);
517 seta[0] = oldset->sig[0];
518 }
519 err |= __put_user(seta[0], &sf->info.si_mask);
520 err |= __copy_to_user(sf->extramask, seta + 1,
521 (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
522
523 err |= copy_in_user((u32 __user *)sf,
524 (u32 __user *)(regs->u_regs[UREG_FP]),
525 sizeof(struct reg_window32));
526
527 if (err)
528 goto sigsegv;
529
530 /* 3. signal handler back-trampoline and parameters */
531 regs->u_regs[UREG_FP] = (unsigned long) sf;
532 regs->u_regs[UREG_I0] = signo;
533 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
534 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
535
536 /* 4. signal handler */
537 regs->tpc = (unsigned long) ka->sa.sa_handler;
538 regs->tnpc = (regs->tpc + 4);
539 if (test_thread_flag(TIF_32BIT)) {
540 regs->tpc &= 0xffffffff;
541 regs->tnpc &= 0xffffffff;
542 }
543
544 /* 5. return to kernel instructions */
545 if (ka->ka_restorer) {
546 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
547 } else {
548 /* Flush instruction space. */
549 unsigned long address = ((unsigned long)&(sf->insns[0]));
550 pgd_t *pgdp = pgd_offset(current->mm, address);
551 pud_t *pudp = pud_offset(pgdp, address);
552 pmd_t *pmdp = pmd_offset(pudp, address);
553 pte_t *ptep;
554 pte_t pte;
555
556 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
557
558 err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/
559 err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/
560 if (err)
561 goto sigsegv;
562
563 preempt_disable();
564 ptep = pte_offset_map(pmdp, address);
565 pte = *ptep;
566 if (pte_present(pte)) {
567 unsigned long page = (unsigned long)
568 page_address(pte_page(pte));
569
570 wmb();
571 __asm__ __volatile__("flush %0 + %1"
572 : /* no outputs */
573 : "r" (page),
574 "r" (address & (PAGE_SIZE - 1))
575 : "memory");
576 }
577 pte_unmap(ptep);
578 preempt_enable();
579 }
580 return;
581
582 sigill:
583 do_exit(SIGILL);
584 sigsegv:
585 force_sigsegv(signo, current);
586 }
587
setup_rt_frame32(struct k_sigaction * ka,struct pt_regs * regs,unsigned long signr,sigset_t * oldset,siginfo_t * info)588 static void setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs,
589 unsigned long signr, sigset_t *oldset,
590 siginfo_t *info)
591 {
592 struct rt_signal_frame32 __user *sf;
593 int sigframe_size;
594 u32 psr;
595 int i, err;
596 compat_sigset_t seta;
597
598 /* 1. Make sure everything is clean */
599 synchronize_user_stack();
600 save_and_clear_fpu();
601
602 sigframe_size = RT_ALIGNEDSZ;
603 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
604 sigframe_size -= sizeof(__siginfo_fpu_t);
605
606 sf = (struct rt_signal_frame32 __user *)
607 get_sigframe(&ka->sa, regs, sigframe_size);
608
609 if (invalid_frame_pointer(sf, sigframe_size))
610 goto sigill;
611
612 if (get_thread_wsaved() != 0)
613 goto sigill;
614
615 /* 2. Save the current process state */
616 if (test_thread_flag(TIF_32BIT)) {
617 regs->tpc &= 0xffffffff;
618 regs->tnpc &= 0xffffffff;
619 }
620 err = put_user(regs->tpc, &sf->regs.pc);
621 err |= __put_user(regs->tnpc, &sf->regs.npc);
622 err |= __put_user(regs->y, &sf->regs.y);
623 psr = tstate_to_psr(regs->tstate);
624 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
625 psr |= PSR_EF;
626 err |= __put_user(psr, &sf->regs.psr);
627 for (i = 0; i < 16; i++)
628 err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]);
629 err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size);
630 err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]);
631 for (i = 1; i < 16; i++)
632 err |= __put_user(((u32 *)regs->u_regs)[2*i],
633 &sf->v8plus.g_upper[i]);
634 err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL,
635 &sf->v8plus.asi);
636
637 if (psr & PSR_EF) {
638 err |= save_fpu_state32(regs, &sf->fpu_state);
639 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
640 } else {
641 err |= __put_user(0, &sf->fpu_save);
642 }
643
644 /* Update the siginfo structure. */
645 err |= copy_siginfo_to_user32(&sf->info, info);
646
647 /* Setup sigaltstack */
648 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
649 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
650 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
651
652 switch (_NSIG_WORDS) {
653 case 4: seta.sig[7] = (oldset->sig[3] >> 32);
654 seta.sig[6] = oldset->sig[3];
655 case 3: seta.sig[5] = (oldset->sig[2] >> 32);
656 seta.sig[4] = oldset->sig[2];
657 case 2: seta.sig[3] = (oldset->sig[1] >> 32);
658 seta.sig[2] = oldset->sig[1];
659 case 1: seta.sig[1] = (oldset->sig[0] >> 32);
660 seta.sig[0] = oldset->sig[0];
661 }
662 err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t));
663
664 err |= copy_in_user((u32 __user *)sf,
665 (u32 __user *)(regs->u_regs[UREG_FP]),
666 sizeof(struct reg_window32));
667 if (err)
668 goto sigsegv;
669
670 /* 3. signal handler back-trampoline and parameters */
671 regs->u_regs[UREG_FP] = (unsigned long) sf;
672 regs->u_regs[UREG_I0] = signr;
673 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
674 regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
675
676 /* 4. signal handler */
677 regs->tpc = (unsigned long) ka->sa.sa_handler;
678 regs->tnpc = (regs->tpc + 4);
679 if (test_thread_flag(TIF_32BIT)) {
680 regs->tpc &= 0xffffffff;
681 regs->tnpc &= 0xffffffff;
682 }
683
684 /* 5. return to kernel instructions */
685 if (ka->ka_restorer)
686 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
687 else {
688 /* Flush instruction space. */
689 unsigned long address = ((unsigned long)&(sf->insns[0]));
690 pgd_t *pgdp = pgd_offset(current->mm, address);
691 pud_t *pudp = pud_offset(pgdp, address);
692 pmd_t *pmdp = pmd_offset(pudp, address);
693 pte_t *ptep;
694
695 regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2);
696
697 /* mov __NR_rt_sigreturn, %g1 */
698 err |= __put_user(0x82102065, &sf->insns[0]);
699
700 /* t 0x10 */
701 err |= __put_user(0x91d02010, &sf->insns[1]);
702 if (err)
703 goto sigsegv;
704
705 preempt_disable();
706 ptep = pte_offset_map(pmdp, address);
707 if (pte_present(*ptep)) {
708 unsigned long page = (unsigned long)
709 page_address(pte_page(*ptep));
710
711 wmb();
712 __asm__ __volatile__("flush %0 + %1"
713 : /* no outputs */
714 : "r" (page),
715 "r" (address & (PAGE_SIZE - 1))
716 : "memory");
717 }
718 pte_unmap(ptep);
719 preempt_enable();
720 }
721 return;
722
723 sigill:
724 do_exit(SIGILL);
725 sigsegv:
726 force_sigsegv(signr, current);
727 }
728
handle_signal32(unsigned long signr,struct k_sigaction * ka,siginfo_t * info,sigset_t * oldset,struct pt_regs * regs)729 static inline void handle_signal32(unsigned long signr, struct k_sigaction *ka,
730 siginfo_t *info,
731 sigset_t *oldset, struct pt_regs *regs)
732 {
733 if (ka->sa.sa_flags & SA_SIGINFO)
734 setup_rt_frame32(ka, regs, signr, oldset, info);
735 else
736 setup_frame32(ka, regs, signr, oldset);
737
738 spin_lock_irq(¤t->sighand->siglock);
739 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
740 if (!(ka->sa.sa_flags & SA_NOMASK))
741 sigaddset(¤t->blocked,signr);
742 recalc_sigpending();
743 spin_unlock_irq(¤t->sighand->siglock);
744 }
745
syscall_restart32(unsigned long orig_i0,struct pt_regs * regs,struct sigaction * sa)746 static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs,
747 struct sigaction *sa)
748 {
749 switch (regs->u_regs[UREG_I0]) {
750 case ERESTART_RESTARTBLOCK:
751 case ERESTARTNOHAND:
752 no_system_call_restart:
753 regs->u_regs[UREG_I0] = EINTR;
754 regs->tstate |= TSTATE_ICARRY;
755 break;
756 case ERESTARTSYS:
757 if (!(sa->sa_flags & SA_RESTART))
758 goto no_system_call_restart;
759 /* fallthrough */
760 case ERESTARTNOINTR:
761 regs->u_regs[UREG_I0] = orig_i0;
762 regs->tpc -= 4;
763 regs->tnpc -= 4;
764 }
765 }
766
767 /* Note that 'init' is a special process: it doesn't get signals it doesn't
768 * want to handle. Thus you cannot kill init even with a SIGKILL even by
769 * mistake.
770 */
do_signal32(sigset_t * oldset,struct pt_regs * regs,int restart_syscall,unsigned long orig_i0)771 void do_signal32(sigset_t *oldset, struct pt_regs * regs,
772 int restart_syscall, unsigned long orig_i0)
773 {
774 struct k_sigaction ka;
775 siginfo_t info;
776 int signr;
777
778 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
779
780 /* If the debugger messes with the program counter, it clears
781 * the "in syscall" bit, directing us to not perform a syscall
782 * restart.
783 */
784 if (restart_syscall && !pt_regs_is_syscall(regs))
785 restart_syscall = 0;
786
787 if (signr > 0) {
788 if (restart_syscall)
789 syscall_restart32(orig_i0, regs, &ka.sa);
790 handle_signal32(signr, &ka, &info, oldset, regs);
791
792 /* A signal was successfully delivered; the saved
793 * sigmask will have been stored in the signal frame,
794 * and will be restored by sigreturn, so we can simply
795 * clear the TS_RESTORE_SIGMASK flag.
796 */
797 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
798
799 tracehook_signal_handler(signr, &info, &ka, regs, 0);
800 return;
801 }
802 if (restart_syscall &&
803 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
804 regs->u_regs[UREG_I0] == ERESTARTSYS ||
805 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
806 /* replay the system call when we are done */
807 regs->u_regs[UREG_I0] = orig_i0;
808 regs->tpc -= 4;
809 regs->tnpc -= 4;
810 }
811 if (restart_syscall &&
812 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
813 regs->u_regs[UREG_G1] = __NR_restart_syscall;
814 regs->tpc -= 4;
815 regs->tnpc -= 4;
816 }
817
818 /* If there's no signal to deliver, we just put the saved sigmask
819 * back
820 */
821 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
822 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
823 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
824 }
825 }
826
827 struct sigstack32 {
828 u32 the_stack;
829 int cur_status;
830 };
831
do_sys32_sigstack(u32 u_ssptr,u32 u_ossptr,unsigned long sp)832 asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp)
833 {
834 struct sigstack32 __user *ssptr =
835 (struct sigstack32 __user *)((unsigned long)(u_ssptr));
836 struct sigstack32 __user *ossptr =
837 (struct sigstack32 __user *)((unsigned long)(u_ossptr));
838 int ret = -EFAULT;
839
840 /* First see if old state is wanted. */
841 if (ossptr) {
842 if (put_user(current->sas_ss_sp + current->sas_ss_size,
843 &ossptr->the_stack) ||
844 __put_user(on_sig_stack(sp), &ossptr->cur_status))
845 goto out;
846 }
847
848 /* Now see if we want to update the new state. */
849 if (ssptr) {
850 u32 ss_sp;
851
852 if (get_user(ss_sp, &ssptr->the_stack))
853 goto out;
854
855 /* If the current stack was set with sigaltstack, don't
856 * swap stacks while we are on it.
857 */
858 ret = -EPERM;
859 if (current->sas_ss_sp && on_sig_stack(sp))
860 goto out;
861
862 /* Since we don't know the extent of the stack, and we don't
863 * track onstack-ness, but rather calculate it, we must
864 * presume a size. Ho hum this interface is lossy.
865 */
866 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
867 current->sas_ss_size = SIGSTKSZ;
868 }
869
870 ret = 0;
871 out:
872 return ret;
873 }
874
do_sys32_sigaltstack(u32 ussa,u32 uossa,unsigned long sp)875 asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp)
876 {
877 stack_t uss, uoss;
878 u32 u_ss_sp = 0;
879 int ret;
880 mm_segment_t old_fs;
881 stack_t32 __user *uss32 = compat_ptr(ussa);
882 stack_t32 __user *uoss32 = compat_ptr(uossa);
883
884 if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) ||
885 __get_user(uss.ss_flags, &uss32->ss_flags) ||
886 __get_user(uss.ss_size, &uss32->ss_size)))
887 return -EFAULT;
888 uss.ss_sp = compat_ptr(u_ss_sp);
889 old_fs = get_fs();
890 set_fs(KERNEL_DS);
891 ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL,
892 uossa ? (stack_t __user *) &uoss : NULL, sp);
893 set_fs(old_fs);
894 if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) ||
895 __put_user(uoss.ss_flags, &uoss32->ss_flags) ||
896 __put_user(uoss.ss_size, &uoss32->ss_size)))
897 return -EFAULT;
898 return ret;
899 }
900