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-rw-r--r--arch/ppc64/kernel/signal32.c998
1 files changed, 0 insertions, 998 deletions
diff --git a/arch/ppc64/kernel/signal32.c b/arch/ppc64/kernel/signal32.c
deleted file mode 100644
index a8b7a5a56bb4..000000000000
--- a/arch/ppc64/kernel/signal32.c
+++ /dev/null
@@ -1,998 +0,0 @@
1/*
2 * signal32.c: Support 32bit signal syscalls.
3 *
4 * Copyright (C) 2001 IBM
5 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
7 *
8 * These routines maintain argument size conversion between 32bit and 64bit
9 * environment.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17#include <linux/config.h>
18#include <linux/sched.h>
19#include <linux/mm.h>
20#include <linux/smp.h>
21#include <linux/smp_lock.h>
22#include <linux/kernel.h>
23#include <linux/signal.h>
24#include <linux/syscalls.h>
25#include <linux/errno.h>
26#include <linux/elf.h>
27#include <linux/compat.h>
28#include <linux/ptrace.h>
29#include <asm/ppc32.h>
30#include <asm/uaccess.h>
31#include <asm/ppcdebug.h>
32#include <asm/unistd.h>
33#include <asm/cacheflush.h>
34#include <asm/vdso.h>
35
36#define DEBUG_SIG 0
37
38#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39
40#define GP_REGS_SIZE32 min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
41
42/*
43 * When we have signals to deliver, we set up on the
44 * user stack, going down from the original stack pointer:
45 * a sigregs32 struct
46 * a sigcontext32 struct
47 * a gap of __SIGNAL_FRAMESIZE32 bytes
48 *
49 * Each of these things must be a multiple of 16 bytes in size.
50 *
51 */
52struct sigregs32 {
53 struct mcontext32 mctx; /* all the register values */
54 /*
55 * Programs using the rs6000/xcoff abi can save up to 19 gp
56 * regs and 18 fp regs below sp before decrementing it.
57 */
58 int abigap[56];
59};
60
61/* We use the mc_pad field for the signal return trampoline. */
62#define tramp mc_pad
63
64/*
65 * When we have rt signals to deliver, we set up on the
66 * user stack, going down from the original stack pointer:
67 * one rt_sigframe32 struct (siginfo + ucontext + ABI gap)
68 * a gap of __SIGNAL_FRAMESIZE32+16 bytes
69 * (the +16 is to get the siginfo and ucontext32 in the same
70 * positions as in older kernels).
71 *
72 * Each of these things must be a multiple of 16 bytes in size.
73 *
74 */
75struct rt_sigframe32 {
76 compat_siginfo_t info;
77 struct ucontext32 uc;
78 /*
79 * Programs using the rs6000/xcoff abi can save up to 19 gp
80 * regs and 18 fp regs below sp before decrementing it.
81 */
82 int abigap[56];
83};
84
85
86/*
87 * Common utility functions used by signal and context support
88 *
89 */
90
91/*
92 * Restore the user process's signal mask
93 * (implemented in signal.c)
94 */
95extern void restore_sigmask(sigset_t *set);
96
97/*
98 * Functions for flipping sigsets (thanks to brain dead generic
99 * implementation that makes things simple for little endian only
100 */
101static inline void compat_from_sigset(compat_sigset_t *compat, sigset_t *set)
102{
103 switch (_NSIG_WORDS) {
104 case 4: compat->sig[5] = set->sig[3] & 0xffffffffull ;
105 compat->sig[7] = set->sig[3] >> 32;
106 case 3: compat->sig[4] = set->sig[2] & 0xffffffffull ;
107 compat->sig[5] = set->sig[2] >> 32;
108 case 2: compat->sig[2] = set->sig[1] & 0xffffffffull ;
109 compat->sig[3] = set->sig[1] >> 32;
110 case 1: compat->sig[0] = set->sig[0] & 0xffffffffull ;
111 compat->sig[1] = set->sig[0] >> 32;
112 }
113}
114
115static inline void sigset_from_compat(sigset_t *set, compat_sigset_t *compat)
116{
117 switch (_NSIG_WORDS) {
118 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32);
119 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32);
120 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32);
121 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32);
122 }
123}
124
125
126/*
127 * Save the current user registers on the user stack.
128 * We only save the altivec registers if the process has used
129 * altivec instructions at some point.
130 */
131static int save_user_regs(struct pt_regs *regs, struct mcontext32 __user *frame, int sigret)
132{
133 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
134 int i, err = 0;
135
136 /* Make sure floating point registers are stored in regs */
137 flush_fp_to_thread(current);
138
139 /* save general and floating-point registers */
140 for (i = 0; i <= PT_RESULT; i ++)
141 err |= __put_user((unsigned int)gregs[i], &frame->mc_gregs[i]);
142 err |= __copy_to_user(&frame->mc_fregs, current->thread.fpr,
143 ELF_NFPREG * sizeof(double));
144 if (err)
145 return 1;
146
147 current->thread.fpscr = 0; /* turn off all fp exceptions */
148
149#ifdef CONFIG_ALTIVEC
150 /* save altivec registers */
151 if (current->thread.used_vr) {
152 flush_altivec_to_thread(current);
153 if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
154 ELF_NVRREG32 * sizeof(vector128)))
155 return 1;
156 /* set MSR_VEC in the saved MSR value to indicate that
157 frame->mc_vregs contains valid data */
158 if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
159 return 1;
160 }
161 /* else assert((regs->msr & MSR_VEC) == 0) */
162
163 /* We always copy to/from vrsave, it's 0 if we don't have or don't
164 * use altivec. Since VSCR only contains 32 bits saved in the least
165 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
166 * most significant bits of that same vector. --BenH
167 */
168 if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
169 return 1;
170#endif /* CONFIG_ALTIVEC */
171
172 if (sigret) {
173 /* Set up the sigreturn trampoline: li r0,sigret; sc */
174 if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
175 || __put_user(0x44000002UL, &frame->tramp[1]))
176 return 1;
177 flush_icache_range((unsigned long) &frame->tramp[0],
178 (unsigned long) &frame->tramp[2]);
179 }
180
181 return 0;
182}
183
184/*
185 * Restore the current user register values from the user stack,
186 * (except for MSR).
187 */
188static long restore_user_regs(struct pt_regs *regs,
189 struct mcontext32 __user *sr, int sig)
190{
191 elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
192 int i;
193 long err = 0;
194 unsigned int save_r2 = 0;
195#ifdef CONFIG_ALTIVEC
196 unsigned long msr;
197#endif
198
199 /*
200 * restore general registers but not including MSR or SOFTE. Also
201 * take care of keeping r2 (TLS) intact if not a signal
202 */
203 if (!sig)
204 save_r2 = (unsigned int)regs->gpr[2];
205 for (i = 0; i <= PT_RESULT; i++) {
206 if ((i == PT_MSR) || (i == PT_SOFTE))
207 continue;
208 err |= __get_user(gregs[i], &sr->mc_gregs[i]);
209 }
210 if (!sig)
211 regs->gpr[2] = (unsigned long) save_r2;
212 if (err)
213 return 1;
214
215 /* force the process to reload the FP registers from
216 current->thread when it next does FP instructions */
217 regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
218 if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
219 sizeof(sr->mc_fregs)))
220 return 1;
221
222#ifdef CONFIG_ALTIVEC
223 /* force the process to reload the altivec registers from
224 current->thread when it next does altivec instructions */
225 regs->msr &= ~MSR_VEC;
226 if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) {
227 /* restore altivec registers from the stack */
228 if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
229 sizeof(sr->mc_vregs)))
230 return 1;
231 } else if (current->thread.used_vr)
232 memset(current->thread.vr, 0, ELF_NVRREG32 * sizeof(vector128));
233
234 /* Always get VRSAVE back */
235 if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
236 return 1;
237#endif /* CONFIG_ALTIVEC */
238
239#ifndef CONFIG_SMP
240 preempt_disable();
241 if (last_task_used_math == current)
242 last_task_used_math = NULL;
243 if (last_task_used_altivec == current)
244 last_task_used_altivec = NULL;
245 preempt_enable();
246#endif
247 return 0;
248}
249
250
251/*
252 * Start of nonRT signal support
253 *
254 * sigset_t is 32 bits for non-rt signals
255 *
256 * System Calls
257 * sigaction sys32_sigaction
258 * sigreturn sys32_sigreturn
259 *
260 * Note sigsuspend has no special 32 bit routine - uses the 64 bit routine
261 *
262 * Other routines
263 * setup_frame32
264 */
265
266/*
267 * Atomically swap in the new signal mask, and wait for a signal.
268 */
269long sys32_sigsuspend(old_sigset_t mask, int p2, int p3, int p4, int p6, int p7,
270 struct pt_regs *regs)
271{
272 sigset_t saveset;
273
274 mask &= _BLOCKABLE;
275 spin_lock_irq(&current->sighand->siglock);
276 saveset = current->blocked;
277 siginitset(&current->blocked, mask);
278 recalc_sigpending();
279 spin_unlock_irq(&current->sighand->siglock);
280
281 regs->result = -EINTR;
282 regs->gpr[3] = EINTR;
283 regs->ccr |= 0x10000000;
284 while (1) {
285 current->state = TASK_INTERRUPTIBLE;
286 schedule();
287 if (do_signal32(&saveset, regs))
288 /*
289 * Returning 0 means we return to userspace via
290 * ret_from_except and thus restore all user
291 * registers from *regs. This is what we need
292 * to do when a signal has been delivered.
293 */
294 return 0;
295 }
296}
297
298long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
299 struct old_sigaction32 __user *oact)
300{
301 struct k_sigaction new_ka, old_ka;
302 int ret;
303
304 if (sig < 0)
305 sig = -sig;
306
307 if (act) {
308 compat_old_sigset_t mask;
309 compat_uptr_t handler, restorer;
310
311 if (get_user(handler, &act->sa_handler) ||
312 __get_user(restorer, &act->sa_restorer) ||
313 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
314 __get_user(mask, &act->sa_mask))
315 return -EFAULT;
316 new_ka.sa.sa_handler = compat_ptr(handler);
317 new_ka.sa.sa_restorer = compat_ptr(restorer);
318 siginitset(&new_ka.sa.sa_mask, mask);
319 }
320
321 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
322 if (!ret && oact) {
323 if (put_user((long)old_ka.sa.sa_handler, &oact->sa_handler) ||
324 __put_user((long)old_ka.sa.sa_restorer, &oact->sa_restorer) ||
325 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
326 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
327 return -EFAULT;
328 }
329
330 return ret;
331}
332
333
334
335/*
336 * Start of RT signal support
337 *
338 * sigset_t is 64 bits for rt signals
339 *
340 * System Calls
341 * sigaction sys32_rt_sigaction
342 * sigpending sys32_rt_sigpending
343 * sigprocmask sys32_rt_sigprocmask
344 * sigreturn sys32_rt_sigreturn
345 * sigqueueinfo sys32_rt_sigqueueinfo
346 * sigsuspend sys32_rt_sigsuspend
347 *
348 * Other routines
349 * setup_rt_frame32
350 * copy_siginfo_to_user32
351 * siginfo32to64
352 */
353
354
355long sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
356 struct sigaction32 __user *oact, size_t sigsetsize)
357{
358 struct k_sigaction new_ka, old_ka;
359 int ret;
360 compat_sigset_t set32;
361
362 /* XXX: Don't preclude handling different sized sigset_t's. */
363 if (sigsetsize != sizeof(compat_sigset_t))
364 return -EINVAL;
365
366 if (act) {
367 compat_uptr_t handler;
368
369 ret = get_user(handler, &act->sa_handler);
370 new_ka.sa.sa_handler = compat_ptr(handler);
371 ret |= __copy_from_user(&set32, &act->sa_mask,
372 sizeof(compat_sigset_t));
373 sigset_from_compat(&new_ka.sa.sa_mask, &set32);
374 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
375 if (ret)
376 return -EFAULT;
377 }
378
379 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
380 if (!ret && oact) {
381 compat_from_sigset(&set32, &old_ka.sa.sa_mask);
382 ret = put_user((long)old_ka.sa.sa_handler, &oact->sa_handler);
383 ret |= __copy_to_user(&oact->sa_mask, &set32,
384 sizeof(compat_sigset_t));
385 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
386 }
387 return ret;
388}
389
390/*
391 * Note: it is necessary to treat how as an unsigned int, with the
392 * corresponding cast to a signed int to insure that the proper
393 * conversion (sign extension) between the register representation
394 * of a signed int (msr in 32-bit mode) and the register representation
395 * of a signed int (msr in 64-bit mode) is performed.
396 */
397long sys32_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
398 compat_sigset_t __user *oset, size_t sigsetsize)
399{
400 sigset_t s;
401 sigset_t __user *up;
402 compat_sigset_t s32;
403 int ret;
404 mm_segment_t old_fs = get_fs();
405
406 if (set) {
407 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
408 return -EFAULT;
409 sigset_from_compat(&s, &s32);
410 }
411
412 set_fs(KERNEL_DS);
413 /* This is valid because of the set_fs() */
414 up = (sigset_t __user *) &s;
415 ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
416 sigsetsize);
417 set_fs(old_fs);
418 if (ret)
419 return ret;
420 if (oset) {
421 compat_from_sigset(&s32, &s);
422 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
423 return -EFAULT;
424 }
425 return 0;
426}
427
428long sys32_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
429{
430 sigset_t s;
431 compat_sigset_t s32;
432 int ret;
433 mm_segment_t old_fs = get_fs();
434
435 set_fs(KERNEL_DS);
436 /* The __user pointer cast is valid because of the set_fs() */
437 ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
438 set_fs(old_fs);
439 if (!ret) {
440 compat_from_sigset(&s32, &s);
441 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
442 return -EFAULT;
443 }
444 return ret;
445}
446
447
448int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
449{
450 int err;
451
452 if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
453 return -EFAULT;
454
455 /* If you change siginfo_t structure, please be sure
456 * this code is fixed accordingly.
457 * It should never copy any pad contained in the structure
458 * to avoid security leaks, but must copy the generic
459 * 3 ints plus the relevant union member.
460 * This routine must convert siginfo from 64bit to 32bit as well
461 * at the same time.
462 */
463 err = __put_user(s->si_signo, &d->si_signo);
464 err |= __put_user(s->si_errno, &d->si_errno);
465 err |= __put_user((short)s->si_code, &d->si_code);
466 if (s->si_code < 0)
467 err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
468 SI_PAD_SIZE32);
469 else switch(s->si_code >> 16) {
470 case __SI_CHLD >> 16:
471 err |= __put_user(s->si_pid, &d->si_pid);
472 err |= __put_user(s->si_uid, &d->si_uid);
473 err |= __put_user(s->si_utime, &d->si_utime);
474 err |= __put_user(s->si_stime, &d->si_stime);
475 err |= __put_user(s->si_status, &d->si_status);
476 break;
477 case __SI_FAULT >> 16:
478 err |= __put_user((unsigned int)(unsigned long)s->si_addr,
479 &d->si_addr);
480 break;
481 case __SI_POLL >> 16:
482 err |= __put_user(s->si_band, &d->si_band);
483 err |= __put_user(s->si_fd, &d->si_fd);
484 break;
485 case __SI_TIMER >> 16:
486 err |= __put_user(s->si_tid, &d->si_tid);
487 err |= __put_user(s->si_overrun, &d->si_overrun);
488 err |= __put_user(s->si_int, &d->si_int);
489 break;
490 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
491 case __SI_MESGQ >> 16:
492 err |= __put_user(s->si_int, &d->si_int);
493 /* fallthrough */
494 case __SI_KILL >> 16:
495 default:
496 err |= __put_user(s->si_pid, &d->si_pid);
497 err |= __put_user(s->si_uid, &d->si_uid);
498 break;
499 }
500 return err;
501}
502
503/*
504 * Note: it is necessary to treat pid and sig as unsigned ints, with the
505 * corresponding cast to a signed int to insure that the proper conversion
506 * (sign extension) between the register representation of a signed int
507 * (msr in 32-bit mode) and the register representation of a signed int
508 * (msr in 64-bit mode) is performed.
509 */
510long sys32_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
511{
512 siginfo_t info;
513 int ret;
514 mm_segment_t old_fs = get_fs();
515
516 if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
517 copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
518 return -EFAULT;
519 set_fs (KERNEL_DS);
520 /* The __user pointer cast is valid becasuse of the set_fs() */
521 ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
522 set_fs (old_fs);
523 return ret;
524}
525
526int sys32_rt_sigsuspend(compat_sigset_t __user * unewset, size_t sigsetsize, int p3,
527 int p4, int p6, int p7, struct pt_regs *regs)
528{
529 sigset_t saveset, newset;
530 compat_sigset_t s32;
531
532 /* XXX: Don't preclude handling different sized sigset_t's. */
533 if (sigsetsize != sizeof(sigset_t))
534 return -EINVAL;
535
536 if (copy_from_user(&s32, unewset, sizeof(s32)))
537 return -EFAULT;
538
539 /*
540 * Swap the 2 words of the 64-bit sigset_t (they are stored
541 * in the "wrong" endian in 32-bit user storage).
542 */
543 sigset_from_compat(&newset, &s32);
544
545 sigdelsetmask(&newset, ~_BLOCKABLE);
546 spin_lock_irq(&current->sighand->siglock);
547 saveset = current->blocked;
548 current->blocked = newset;
549 recalc_sigpending();
550 spin_unlock_irq(&current->sighand->siglock);
551
552 regs->result = -EINTR;
553 regs->gpr[3] = EINTR;
554 regs->ccr |= 0x10000000;
555 while (1) {
556 current->state = TASK_INTERRUPTIBLE;
557 schedule();
558 if (do_signal32(&saveset, regs))
559 /*
560 * Returning 0 means we return to userspace via
561 * ret_from_except and thus restore all user
562 * registers from *regs. This is what we need
563 * to do when a signal has been delivered.
564 */
565 return 0;
566 }
567}
568
569/*
570 * Start Alternate signal stack support
571 *
572 * System Calls
573 * sigaltatck sys32_sigaltstack
574 */
575
576int sys32_sigaltstack(u32 __new, u32 __old, int r5,
577 int r6, int r7, int r8, struct pt_regs *regs)
578{
579 stack_32_t __user * newstack = (stack_32_t __user *)(long) __new;
580 stack_32_t __user * oldstack = (stack_32_t __user *)(long) __old;
581 stack_t uss, uoss;
582 int ret;
583 mm_segment_t old_fs;
584 unsigned long sp;
585 compat_uptr_t ss_sp;
586
587 /*
588 * set sp to the user stack on entry to the system call
589 * the system call router sets R9 to the saved registers
590 */
591 sp = regs->gpr[1];
592
593 /* Put new stack info in local 64 bit stack struct */
594 if (newstack) {
595 if (get_user(ss_sp, &newstack->ss_sp) ||
596 __get_user(uss.ss_flags, &newstack->ss_flags) ||
597 __get_user(uss.ss_size, &newstack->ss_size))
598 return -EFAULT;
599 uss.ss_sp = compat_ptr(ss_sp);
600 }
601
602 old_fs = get_fs();
603 set_fs(KERNEL_DS);
604 /* The __user pointer casts are valid because of the set_fs() */
605 ret = do_sigaltstack(
606 newstack ? (stack_t __user *) &uss : NULL,
607 oldstack ? (stack_t __user *) &uoss : NULL,
608 sp);
609 set_fs(old_fs);
610 /* Copy the stack information to the user output buffer */
611 if (!ret && oldstack &&
612 (put_user((long)uoss.ss_sp, &oldstack->ss_sp) ||
613 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
614 __put_user(uoss.ss_size, &oldstack->ss_size)))
615 return -EFAULT;
616 return ret;
617}
618
619
620/*
621 * Set up a signal frame for a "real-time" signal handler
622 * (one which gets siginfo).
623 */
624static int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
625 siginfo_t *info, sigset_t *oldset,
626 struct pt_regs * regs, unsigned long newsp)
627{
628 struct rt_sigframe32 __user *rt_sf;
629 struct mcontext32 __user *frame;
630 unsigned long origsp = newsp;
631 compat_sigset_t c_oldset;
632
633 /* Set up Signal Frame */
634 /* Put a Real Time Context onto stack */
635 newsp -= sizeof(*rt_sf);
636 rt_sf = (struct rt_sigframe32 __user *)newsp;
637
638 /* create a stack frame for the caller of the handler */
639 newsp -= __SIGNAL_FRAMESIZE32 + 16;
640
641 if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
642 goto badframe;
643
644 compat_from_sigset(&c_oldset, oldset);
645
646 /* Put the siginfo & fill in most of the ucontext */
647 if (copy_siginfo_to_user32(&rt_sf->info, info)
648 || __put_user(0, &rt_sf->uc.uc_flags)
649 || __put_user(0, &rt_sf->uc.uc_link)
650 || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
651 || __put_user(sas_ss_flags(regs->gpr[1]),
652 &rt_sf->uc.uc_stack.ss_flags)
653 || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
654 || __put_user((u32)(u64)&rt_sf->uc.uc_mcontext, &rt_sf->uc.uc_regs)
655 || __copy_to_user(&rt_sf->uc.uc_sigmask, &c_oldset, sizeof(c_oldset)))
656 goto badframe;
657
658 /* Save user registers on the stack */
659 frame = &rt_sf->uc.uc_mcontext;
660 if (put_user(regs->gpr[1], (u32 __user *)newsp))
661 goto badframe;
662
663 if (vdso32_rt_sigtramp && current->thread.vdso_base) {
664 if (save_user_regs(regs, frame, 0))
665 goto badframe;
666 regs->link = current->thread.vdso_base + vdso32_rt_sigtramp;
667 } else {
668 if (save_user_regs(regs, frame, __NR_rt_sigreturn))
669 goto badframe;
670 regs->link = (unsigned long) frame->tramp;
671 }
672 regs->gpr[1] = (unsigned long) newsp;
673 regs->gpr[3] = sig;
674 regs->gpr[4] = (unsigned long) &rt_sf->info;
675 regs->gpr[5] = (unsigned long) &rt_sf->uc;
676 regs->gpr[6] = (unsigned long) rt_sf;
677 regs->nip = (unsigned long) ka->sa.sa_handler;
678 regs->trap = 0;
679 regs->result = 0;
680
681 if (test_thread_flag(TIF_SINGLESTEP))
682 ptrace_notify(SIGTRAP);
683
684 return 1;
685
686badframe:
687#if DEBUG_SIG
688 printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
689 regs, frame, newsp);
690#endif
691 force_sigsegv(sig, current);
692 return 0;
693}
694
695static long do_setcontext32(struct ucontext32 __user *ucp, struct pt_regs *regs, int sig)
696{
697 compat_sigset_t c_set;
698 sigset_t set;
699 u32 mcp;
700
701 if (__copy_from_user(&c_set, &ucp->uc_sigmask, sizeof(c_set))
702 || __get_user(mcp, &ucp->uc_regs))
703 return -EFAULT;
704 sigset_from_compat(&set, &c_set);
705 restore_sigmask(&set);
706 if (restore_user_regs(regs, (struct mcontext32 __user *)(u64)mcp, sig))
707 return -EFAULT;
708
709 return 0;
710}
711
712/*
713 * Handle {get,set,swap}_context operations for 32 bits processes
714 */
715
716long sys32_swapcontext(struct ucontext32 __user *old_ctx,
717 struct ucontext32 __user *new_ctx,
718 int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
719{
720 unsigned char tmp;
721 compat_sigset_t c_set;
722
723 /* Context size is for future use. Right now, we only make sure
724 * we are passed something we understand
725 */
726 if (ctx_size < sizeof(struct ucontext32))
727 return -EINVAL;
728
729 if (old_ctx != NULL) {
730 compat_from_sigset(&c_set, &current->blocked);
731 if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
732 || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
733 || __copy_to_user(&old_ctx->uc_sigmask, &c_set, sizeof(c_set))
734 || __put_user((u32)(u64)&old_ctx->uc_mcontext, &old_ctx->uc_regs))
735 return -EFAULT;
736 }
737 if (new_ctx == NULL)
738 return 0;
739 if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
740 || __get_user(tmp, (u8 __user *) new_ctx)
741 || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
742 return -EFAULT;
743
744 /*
745 * If we get a fault copying the context into the kernel's
746 * image of the user's registers, we can't just return -EFAULT
747 * because the user's registers will be corrupted. For instance
748 * the NIP value may have been updated but not some of the
749 * other registers. Given that we have done the access_ok
750 * and successfully read the first and last bytes of the region
751 * above, this should only happen in an out-of-memory situation
752 * or if another thread unmaps the region containing the context.
753 * We kill the task with a SIGSEGV in this situation.
754 */
755 if (do_setcontext32(new_ctx, regs, 0))
756 do_exit(SIGSEGV);
757
758 return 0;
759}
760
761long sys32_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
762 struct pt_regs *regs)
763{
764 struct rt_sigframe32 __user *rt_sf;
765 int ret;
766
767
768 /* Always make any pending restarted system calls return -EINTR */
769 current_thread_info()->restart_block.fn = do_no_restart_syscall;
770
771 rt_sf = (struct rt_sigframe32 __user *)
772 (regs->gpr[1] + __SIGNAL_FRAMESIZE32 + 16);
773 if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
774 goto bad;
775 if (do_setcontext32(&rt_sf->uc, regs, 1))
776 goto bad;
777
778 /*
779 * It's not clear whether or why it is desirable to save the
780 * sigaltstack setting on signal delivery and restore it on
781 * signal return. But other architectures do this and we have
782 * always done it up until now so it is probably better not to
783 * change it. -- paulus
784 * We use the sys32_ version that does the 32/64 bits conversion
785 * and takes userland pointer directly. What about error checking ?
786 * nobody does any...
787 */
788 sys32_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
789
790 ret = regs->result;
791
792 return ret;
793
794 bad:
795 force_sig(SIGSEGV, current);
796 return 0;
797}
798
799
800/*
801 * OK, we're invoking a handler
802 */
803static int handle_signal32(unsigned long sig, struct k_sigaction *ka,
804 siginfo_t *info, sigset_t *oldset,
805 struct pt_regs * regs, unsigned long newsp)
806{
807 struct sigcontext32 __user *sc;
808 struct sigregs32 __user *frame;
809 unsigned long origsp = newsp;
810
811 /* Set up Signal Frame */
812 newsp -= sizeof(struct sigregs32);
813 frame = (struct sigregs32 __user *) newsp;
814
815 /* Put a sigcontext on the stack */
816 newsp -= sizeof(*sc);
817 sc = (struct sigcontext32 __user *) newsp;
818
819 /* create a stack frame for the caller of the handler */
820 newsp -= __SIGNAL_FRAMESIZE32;
821
822 if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
823 goto badframe;
824
825#if _NSIG != 64
826#error "Please adjust handle_signal32()"
827#endif
828 if (__put_user((u32)(u64)ka->sa.sa_handler, &sc->handler)
829 || __put_user(oldset->sig[0], &sc->oldmask)
830 || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
831 || __put_user((u32)(u64)frame, &sc->regs)
832 || __put_user(sig, &sc->signal))
833 goto badframe;
834
835 if (vdso32_sigtramp && current->thread.vdso_base) {
836 if (save_user_regs(regs, &frame->mctx, 0))
837 goto badframe;
838 regs->link = current->thread.vdso_base + vdso32_sigtramp;
839 } else {
840 if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
841 goto badframe;
842 regs->link = (unsigned long) frame->mctx.tramp;
843 }
844
845 if (put_user(regs->gpr[1], (u32 __user *)newsp))
846 goto badframe;
847 regs->gpr[1] = (unsigned long) newsp;
848 regs->gpr[3] = sig;
849 regs->gpr[4] = (unsigned long) sc;
850 regs->nip = (unsigned long) ka->sa.sa_handler;
851 regs->trap = 0;
852 regs->result = 0;
853
854 if (test_thread_flag(TIF_SINGLESTEP))
855 ptrace_notify(SIGTRAP);
856
857 return 1;
858
859badframe:
860#if DEBUG_SIG
861 printk("badframe in handle_signal, regs=%p frame=%x newsp=%x\n",
862 regs, frame, *newspp);
863#endif
864 force_sigsegv(sig, current);
865 return 0;
866}
867
868/*
869 * Do a signal return; undo the signal stack.
870 */
871long sys32_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
872 struct pt_regs *regs)
873{
874 struct sigcontext32 __user *sc;
875 struct sigcontext32 sigctx;
876 struct mcontext32 __user *sr;
877 sigset_t set;
878 int ret;
879
880 /* Always make any pending restarted system calls return -EINTR */
881 current_thread_info()->restart_block.fn = do_no_restart_syscall;
882
883 sc = (struct sigcontext32 __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE32);
884 if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
885 goto badframe;
886
887 /*
888 * Note that PPC32 puts the upper 32 bits of the sigmask in the
889 * unused part of the signal stackframe
890 */
891 set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
892 restore_sigmask(&set);
893
894 sr = (struct mcontext32 __user *)(u64)sigctx.regs;
895 if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
896 || restore_user_regs(regs, sr, 1))
897 goto badframe;
898
899 ret = regs->result;
900 return ret;
901
902badframe:
903 force_sig(SIGSEGV, current);
904 return 0;
905}
906
907
908
909/*
910 * Start of do_signal32 routine
911 *
912 * This routine gets control when a pending signal needs to be processed
913 * in the 32 bit target thread -
914 *
915 * It handles both rt and non-rt signals
916 */
917
918/*
919 * Note that 'init' is a special process: it doesn't get signals it doesn't
920 * want to handle. Thus you cannot kill init even with a SIGKILL even by
921 * mistake.
922 */
923
924int do_signal32(sigset_t *oldset, struct pt_regs *regs)
925{
926 siginfo_t info;
927 unsigned int frame, newsp;
928 int signr, ret;
929 struct k_sigaction ka;
930
931 if (!oldset)
932 oldset = &current->blocked;
933
934 newsp = frame = 0;
935
936 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
937
938 if (TRAP(regs) == 0x0C00 /* System Call! */
939 && regs->ccr & 0x10000000 /* error signalled */
940 && ((ret = regs->gpr[3]) == ERESTARTSYS
941 || ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
942 || ret == ERESTART_RESTARTBLOCK)) {
943
944 if (signr > 0
945 && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
946 || (ret == ERESTARTSYS
947 && !(ka.sa.sa_flags & SA_RESTART)))) {
948 /* make the system call return an EINTR error */
949 regs->result = -EINTR;
950 regs->gpr[3] = EINTR;
951 /* note that the cr0.SO bit is already set */
952 } else {
953 regs->nip -= 4; /* Back up & retry system call */
954 regs->result = 0;
955 regs->trap = 0;
956 if (ret == ERESTART_RESTARTBLOCK)
957 regs->gpr[0] = __NR_restart_syscall;
958 else
959 regs->gpr[3] = regs->orig_gpr3;
960 }
961 }
962
963 if (signr == 0)
964 return 0; /* no signals delivered */
965
966 if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
967 && (!on_sig_stack(regs->gpr[1])))
968 newsp = (current->sas_ss_sp + current->sas_ss_size);
969 else
970 newsp = regs->gpr[1];
971 newsp &= ~0xfUL;
972
973 /*
974 * Reenable the DABR before delivering the signal to
975 * user space. The DABR will have been cleared if it
976 * triggered inside the kernel.
977 */
978 if (current->thread.dabr)
979 set_dabr(current->thread.dabr);
980
981 /* Whee! Actually deliver the signal. */
982 if (ka.sa.sa_flags & SA_SIGINFO)
983 ret = handle_rt_signal32(signr, &ka, &info, oldset, regs, newsp);
984 else
985 ret = handle_signal32(signr, &ka, &info, oldset, regs, newsp);
986
987 if (ret) {
988 spin_lock_irq(&current->sighand->siglock);
989 sigorsets(&current->blocked, &current->blocked,
990 &ka.sa.sa_mask);
991 if (!(ka.sa.sa_flags & SA_NODEFER))
992 sigaddset(&current->blocked, signr);
993 recalc_sigpending();
994 spin_unlock_irq(&current->sighand->siglock);
995 }
996
997 return ret;
998}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-19 02:09:26 -0500