2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000, 2006 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/cache.h>
11 #include <linux/compat.h>
12 #include <linux/sched.h>
14 #include <linux/smp.h>
15 #include <linux/kernel.h>
16 #include <linux/signal.h>
17 #include <linux/syscalls.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/suspend.h>
22 #include <linux/compiler.h>
23 #include <linux/uaccess.h>
27 #include <asm/compat-signal.h>
28 #include <linux/bitops.h>
29 #include <asm/cacheflush.h>
31 #include <asm/ucontext.h>
37 #include "signal-common.h"
39 static int (*save_fp_context32)(struct sigcontext32 __user *sc);
40 static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
42 extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
43 extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
45 extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
46 extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);
49 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
51 #define __NR_O32_restart_syscall 4253
53 /* 32-bit compatibility types */
55 typedef unsigned int __sighandler32_t;
56 typedef void (*vfptr_t)(void);
59 unsigned int sa_flags;
60 __sighandler32_t sa_handler;
61 compat_sigset_t sa_mask;
67 compat_stack_t uc_stack;
68 struct sigcontext32 uc_mcontext;
69 compat_sigset_t uc_sigmask; /* mask last for extensibility */
73 u32 sf_ass[4]; /* argument save space for o32 */
74 u32 sf_pad[2]; /* Was: signal trampoline */
75 struct sigcontext32 sf_sc;
76 compat_sigset_t sf_mask;
79 struct rt_sigframe32 {
80 u32 rs_ass[4]; /* argument save space for o32 */
81 u32 rs_pad[2]; /* Was: signal trampoline */
82 compat_siginfo_t rs_info;
83 struct ucontext32 rs_uc;
89 static int protected_save_fp_context32(struct sigcontext32 __user *sc)
95 err = save_fp_context32(sc); /* this might fail */
99 /* touch the sigcontext and try again */
100 err = __put_user(0, &sc->sc_fpregs[0]) |
101 __put_user(0, &sc->sc_fpregs[31]) |
102 __put_user(0, &sc->sc_fpc_csr);
104 break; /* really bad sigcontext */
109 static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
111 int err, tmp __maybe_unused;
115 err = restore_fp_context32(sc); /* this might fail */
119 /* touch the sigcontext and try again */
120 err = __get_user(tmp, &sc->sc_fpregs[0]) |
121 __get_user(tmp, &sc->sc_fpregs[31]) |
122 __get_user(tmp, &sc->sc_fpc_csr);
124 break; /* really bad sigcontext */
129 static int setup_sigcontext32(struct pt_regs *regs,
130 struct sigcontext32 __user *sc)
136 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
138 err |= __put_user(0, &sc->sc_regs[0]);
139 for (i = 1; i < 32; i++)
140 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
142 err |= __put_user(regs->hi, &sc->sc_mdhi);
143 err |= __put_user(regs->lo, &sc->sc_mdlo);
145 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
146 err |= __put_user(mfhi1(), &sc->sc_hi1);
147 err |= __put_user(mflo1(), &sc->sc_lo1);
148 err |= __put_user(mfhi2(), &sc->sc_hi2);
149 err |= __put_user(mflo2(), &sc->sc_lo2);
150 err |= __put_user(mfhi3(), &sc->sc_hi3);
151 err |= __put_user(mflo3(), &sc->sc_lo3);
154 used_math = !!used_math();
155 err |= __put_user(used_math, &sc->sc_used_math);
159 * Save FPU state to signal context. Signal handler
160 * will "inherit" current FPU state.
162 err |= protected_save_fp_context32(sc);
168 check_and_restore_fp_context32(struct sigcontext32 __user *sc)
172 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
175 err |= protected_restore_fp_context32(sc);
179 static int restore_sigcontext32(struct pt_regs *regs,
180 struct sigcontext32 __user *sc)
187 /* Always make any pending restarted system calls return -EINTR */
188 current_thread_info()->restart_block.fn = do_no_restart_syscall;
190 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
191 err |= __get_user(regs->hi, &sc->sc_mdhi);
192 err |= __get_user(regs->lo, &sc->sc_mdlo);
194 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
195 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
196 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
197 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
198 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
199 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
200 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
203 for (i = 1; i < 32; i++)
204 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
206 err |= __get_user(used_math, &sc->sc_used_math);
207 conditional_used_math(used_math);
210 /* restore fpu context if we have used it before */
212 err = check_and_restore_fp_context32(sc);
214 /* signal handler may have used FPU. Give it up. */
224 extern void __put_sigset_unknown_nsig(void);
225 extern void __get_sigset_unknown_nsig(void);
227 static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
231 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
234 switch (_NSIG_WORDS) {
236 __put_sigset_unknown_nsig();
238 err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
239 err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
241 err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
242 err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
248 static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)
251 unsigned long sig[4];
253 if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
256 switch (_NSIG_WORDS) {
258 __get_sigset_unknown_nsig();
260 err |= __get_user(sig[3], &ubuf->sig[3]);
261 err |= __get_user(sig[2], &ubuf->sig[2]);
262 kbuf->sig[1] = sig[2] | (sig[3] << 32);
264 err |= __get_user(sig[1], &ubuf->sig[1]);
265 err |= __get_user(sig[0], &ubuf->sig[0]);
266 kbuf->sig[0] = sig[0] | (sig[1] << 32);
273 * Atomically swap in the new signal mask, and wait for a signal.
276 asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
278 compat_sigset_t __user *uset;
281 uset = (compat_sigset_t __user *) regs.regs[4];
282 if (get_sigset(&newset, uset))
284 return sigsuspend(&newset);
287 SYSCALL_DEFINE3(32_sigaction, long, sig, const struct sigaction32 __user *, act,
288 struct sigaction32 __user *, oact)
290 struct k_sigaction new_ka, old_ka;
298 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
300 err |= __get_user(handler, &act->sa_handler);
301 new_ka.sa.sa_handler = (void __user *)(s64)handler;
302 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
303 err |= __get_user(mask, &act->sa_mask.sig[0]);
307 siginitset(&new_ka.sa.sa_mask, mask);
310 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
313 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
315 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
316 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
318 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
319 err |= __put_user(0, &oact->sa_mask.sig[1]);
320 err |= __put_user(0, &oact->sa_mask.sig[2]);
321 err |= __put_user(0, &oact->sa_mask.sig[3]);
329 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
333 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
336 /* If you change siginfo_t structure, please be sure
337 this code is fixed accordingly.
338 It should never copy any pad contained in the structure
339 to avoid security leaks, but must copy the generic
340 3 ints plus the relevant union member.
341 This routine must convert siginfo from 64bit to 32bit as well
343 err = __put_user(from->si_signo, &to->si_signo);
344 err |= __put_user(from->si_errno, &to->si_errno);
345 err |= __put_user((short)from->si_code, &to->si_code);
346 if (from->si_code < 0)
347 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
349 switch (from->si_code >> 16) {
350 case __SI_TIMER >> 16:
351 err |= __put_user(from->si_tid, &to->si_tid);
352 err |= __put_user(from->si_overrun, &to->si_overrun);
353 err |= __put_user(from->si_int, &to->si_int);
355 case __SI_CHLD >> 16:
356 err |= __put_user(from->si_utime, &to->si_utime);
357 err |= __put_user(from->si_stime, &to->si_stime);
358 err |= __put_user(from->si_status, &to->si_status);
360 err |= __put_user(from->si_pid, &to->si_pid);
361 err |= __put_user(from->si_uid, &to->si_uid);
363 case __SI_FAULT >> 16:
364 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
366 case __SI_POLL >> 16:
367 err |= __put_user(from->si_band, &to->si_band);
368 err |= __put_user(from->si_fd, &to->si_fd);
370 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
371 case __SI_MESGQ >> 16:
372 err |= __put_user(from->si_pid, &to->si_pid);
373 err |= __put_user(from->si_uid, &to->si_uid);
374 err |= __put_user(from->si_int, &to->si_int);
381 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
383 memset(to, 0, sizeof *to);
385 if (copy_from_user(to, from, 3*sizeof(int)) ||
386 copy_from_user(to->_sifields._pad,
387 from->_sifields._pad, SI_PAD_SIZE32))
393 asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
395 struct sigframe32 __user *frame;
399 frame = (struct sigframe32 __user *) regs.regs[29];
400 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
402 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
405 set_current_blocked(&blocked);
407 sig = restore_sigcontext32(®s, &frame->sf_sc);
411 force_sig(sig, current);
414 * Don't let your children do this ...
416 __asm__ __volatile__(
424 force_sig(SIGSEGV, current);
427 asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
429 struct rt_sigframe32 __user *frame;
433 frame = (struct rt_sigframe32 __user *) regs.regs[29];
434 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
436 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
439 set_current_blocked(&set);
441 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
445 force_sig(sig, current);
447 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
451 * Don't let your children do this ...
453 __asm__ __volatile__(
461 force_sig(SIGSEGV, current);
464 static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
465 struct pt_regs *regs, int signr, sigset_t *set)
467 struct sigframe32 __user *frame;
470 frame = get_sigframe(ka, regs, sizeof(*frame));
471 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
474 err |= setup_sigcontext32(regs, &frame->sf_sc);
475 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
481 * Arguments to signal handler:
484 * a1 = 0 (should be cause)
485 * a2 = pointer to struct sigcontext
487 * $25 and c0_epc point to the signal handler, $29 points to the
490 regs->regs[ 4] = signr;
492 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
493 regs->regs[29] = (unsigned long) frame;
494 regs->regs[31] = (unsigned long) sig_return;
495 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
497 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
498 current->comm, current->pid,
499 frame, regs->cp0_epc, regs->regs[31]);
504 force_sigsegv(signr, current);
508 static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
509 struct pt_regs *regs, int signr, sigset_t *set,
512 struct rt_sigframe32 __user *frame;
515 frame = get_sigframe(ka, regs, sizeof(*frame));
516 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
519 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
520 err |= copy_siginfo_to_user32(&frame->rs_info, info);
522 /* Create the ucontext. */
523 err |= __put_user(0, &frame->rs_uc.uc_flags);
524 err |= __put_user(0, &frame->rs_uc.uc_link);
525 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
526 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
527 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
533 * Arguments to signal handler:
536 * a1 = 0 (should be cause)
537 * a2 = pointer to ucontext
539 * $25 and c0_epc point to the signal handler, $29 points to
540 * the struct rt_sigframe32.
542 regs->regs[ 4] = signr;
543 regs->regs[ 5] = (unsigned long) &frame->rs_info;
544 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
545 regs->regs[29] = (unsigned long) frame;
546 regs->regs[31] = (unsigned long) sig_return;
547 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
549 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
550 current->comm, current->pid,
551 frame, regs->cp0_epc, regs->regs[31]);
556 force_sigsegv(signr, current);
561 * o32 compatibility on 64-bit kernels, without DSP ASE
563 struct mips_abi mips_abi_32 = {
564 .setup_frame = setup_frame_32,
565 .signal_return_offset =
566 offsetof(struct mips_vdso, o32_signal_trampoline),
567 .setup_rt_frame = setup_rt_frame_32,
568 .rt_signal_return_offset =
569 offsetof(struct mips_vdso, o32_rt_signal_trampoline),
570 .restart = __NR_O32_restart_syscall
573 SYSCALL_DEFINE4(32_rt_sigaction, int, sig,
574 const struct sigaction32 __user *, act,
575 struct sigaction32 __user *, oact, unsigned int, sigsetsize)
577 struct k_sigaction new_sa, old_sa;
580 /* XXX: Don't preclude handling different sized sigset_t's. */
581 if (sigsetsize != sizeof(sigset_t))
588 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
590 err |= __get_user(handler, &act->sa_handler);
591 new_sa.sa.sa_handler = (void __user *)(s64)handler;
592 err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
593 err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
598 ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
603 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
606 err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
608 err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
609 err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
617 SYSCALL_DEFINE3(32_rt_sigqueueinfo, int, pid, int, sig,
618 compat_siginfo_t __user *, uinfo)
622 mm_segment_t old_fs = get_fs();
624 if (copy_from_user(&info, uinfo, 3*sizeof(int)) ||
625 copy_from_user(info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
628 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
633 static int signal32_init(void)
636 save_fp_context32 = _save_fp_context32;
637 restore_fp_context32 = _restore_fp_context32;
639 save_fp_context32 = fpu_emulator_save_context32;
640 restore_fp_context32 = fpu_emulator_restore_context32;
646 arch_initcall(signal32_init);