sys/arch/m68k/m68k/compat_13_machdep.c

   1 /*      $NetBSD: compat_13_machdep.c,v 1.13 2008/04/24 18:39:20 ad Exp $        */
   2
   3 /*
   4  * Copyright (c) 1982, 1986, 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * the Systems Programming Group of the University of Utah Computer
   9  * Science Department.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      from: Utah Hdr: machdep.c 1.74 92/12/20
  36  *      from: @(#)machdep.c     8.10 (Berkeley) 4/20/94
  37  */
  38 /*
  39  * Copyright (c) 1988 University of Utah.
  40  *
  41  * This code is derived from software contributed to Berkeley by
  42  * the Systems Programming Group of the University of Utah Computer
  43  * Science Department.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions and the following disclaimer.
  50  * 2. Redistributions in binary form must reproduce the above copyright
  51  *    notice, this list of conditions and the following disclaimer in the
  52  *    documentation and/or other materials provided with the distribution.
  53  * 3. All advertising materials mentioning features or use of this software
  54  *    must display the following acknowledgement:
  55  *      This product includes software developed by the University of
  56  *      California, Berkeley and its contributors.
  57  * 4. Neither the name of the University nor the names of its contributors
  58  *    may be used to endorse or promote products derived from this software
  59  *    without specific prior written permission.
  60  *
  61  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  62  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  63  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  64  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  65  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  66  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  67  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  68  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  69  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  70  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  71  * SUCH DAMAGE.
  72  *
  73  *      from: Utah Hdr: machdep.c 1.74 92/12/20
  74  *      from: @(#)machdep.c     8.10 (Berkeley) 4/20/94
  75  */
  76
  77 #include <sys/cdefs.h>
  78 __KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.13 2008/04/24 18:39:20 ad Exp $");
  79
  80 #include <sys/param.h>
  81 #include <sys/systm.h>
  82 #include <sys/kernel.h>
  83 #include <sys/proc.h>
  84 #include <sys/signal.h>
  85 #include <sys/signalvar.h>
  86
  87 #include <sys/mount.h>
  88 #include <sys/syscallargs.h>
  89
  90 #include <compat/sys/signal.h>
  91 #include <compat/sys/signalvar.h>
  92
  93 #include <machine/cpu.h>
  94 #include <machine/reg.h>
  95
  96 /*
  97  * System call to cleanup state after a signal
  98  * has been taken.  Reset signal mask and
  99  * stack state from context left by sendsig (above).
 100  * Return to previous pc and psl as specified by
 101  * context left by sendsig. Check carefully to
 102  * make sure that the user has not modified the
 103  * psl to gain improper privileges or to cause
 104  * a machine fault.
 105  */
 106 int
 107 compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
 108 {
 109         /* {
 110                 syscallarg(struct sigcontext13 *) sigcntxp;
 111         } */
 112         struct proc *p = l->l_proc;
 113         struct sigcontext13 *scp;
 114         struct frame *frame;
 115         struct sigcontext13 tsigc;
 116         sigset_t mask;
 117
 118         /*
 119          * The trampoline code hands us the context.
 120          * It is unsafe to keep track of it ourselves, in the event that a
 121          * program jumps out of a signal handler.
 122          */
 123         scp = SCARG(uap, sigcntxp);
 124         if ((int)scp & 1)
 125                 return EINVAL;
 126
 127         if (copyin(scp, &tsigc, sizeof(tsigc)) != 0)
 128                 return EFAULT;
 129         scp = &tsigc;
 130
 131         /* Make sure the user isn't pulling a fast one on us! */
 132         if ((scp->sc_ps & (PSL_MBZ|PSL_IPL|PSL_S)) != 0)
 133                 return EINVAL;
 134
 135         /* Restore register context. */
 136         frame = (struct frame *)l->l_md.md_regs;
 137
 138         /*
 139          * We only support restoring the sigcontext13 in this call.
 140          * We are not called from the sigcode (per sendsig()), so
 141          * we will not have a sigstate to restore.
 142          */
 143         if (scp->sc_ap != 0)
 144                 return EINVAL;
 145
 146         /*
 147          * Restore the user supplied information.
 148          * This should be at the last so that the error (EINVAL)
 149          * is reported to the sigreturn caller, not to the
 150          * jump destination.
 151          */
 152
 153         frame->f_regs[SP] = scp->sc_sp;
 154         frame->f_regs[A6] = scp->sc_fp;
 155         frame->f_pc = scp->sc_pc;
 156         frame->f_sr = scp->sc_ps;
 157
 158         mutex_enter(p->p_lock);
 159
 160         /* Restore signal stack. */
 161         if (scp->sc_onstack & SS_ONSTACK)
 162                 l->l_sigstk.ss_flags |= SS_ONSTACK;
 163         else
 164                 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
 165
 166         /* Restore signal mask. */
 167         native_sigset13_to_sigset(&scp->sc_mask, &mask);
 168         (void)sigprocmask1(l, SIG_SETMASK, &mask, 0);
 169
 170         mutex_exit(p->p_lock);
 171
 172         return EJUSTRETURN;
 173 }