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      1 /*	$NetBSD: compat_13_machdep.c,v 1.23 2024/06/19 15:19:22 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      5  * Copyright (C) 1995, 1996 TooLs GmbH.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by TooLs GmbH.
     19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.23 2024/06/19 15:19:22 rin Exp $");
     36 
     37 #ifdef _KERNEL_OPT
     38 #include "opt_ppcarch.h"
     39 #endif
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/signalvar.h>
     44 #include <sys/kernel.h>
     45 #include <sys/proc.h>
     46 #include <sys/mount.h>
     47 #include <sys/syscallargs.h>
     48 
     49 #include <uvm/uvm_extern.h>
     50 
     51 #include <compat/sys/signal.h>
     52 #include <compat/sys/signalvar.h>
     53 
     54 #include <powerpc/psl.h>
     55 
     56 #ifdef _LP64
     57 
     58 /*
     59  * COMPAT_13 is useful only with COMPAT_NETBSD32.
     60  */
     61 
     62 int
     63 compat_13_sys_sigreturn(struct lwp *l,
     64     const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
     65 {
     66 
     67 	return ENOSYS;
     68 }
     69 
     70 #else
     71 
     72 int
     73 compat_13_sys_sigreturn(struct lwp *l,
     74     const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
     75 {
     76 	/* {
     77 		syscallarg(struct sigcontext13 *) sigcntxp;
     78 	} */
     79 	struct proc * const p = l->l_proc;
     80 	struct trapframe * const tf = l->l_md.md_utf;
     81 	struct sigcontext13 sc;
     82 	int error;
     83 	sigset_t mask;
     84 
     85 	/*
     86 	 * The trampoline hands us the context.
     87 	 * It is unsafe to keep track of it ourselves, in the event that a
     88 	 * program jumps out of a signal handler.
     89 	 */
     90 	if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0)
     91 		return (error);
     92 
     93 	if (!PSL_USEROK_P(sc.sc_frame.srr1))
     94 		return (EINVAL);
     95 
     96 	/* Restore register context. */
     97 	memcpy(tf->tf_fixreg, sc.sc_frame.fixreg, sizeof(tf->tf_fixreg));
     98 	tf->tf_lr   = sc.sc_frame.lr;
     99 	tf->tf_cr   = sc.sc_frame.cr;
    100 	tf->tf_xer  = sc.sc_frame.xer;
    101 	tf->tf_ctr  = sc.sc_frame.ctr;
    102 	tf->tf_srr0 = sc.sc_frame.srr0;
    103 	tf->tf_srr1 = sc.sc_frame.srr1;
    104 #ifdef PPC_OEA
    105 	tf->tf_vrsave = sc.sc_frame.vrsave;
    106 	tf->tf_mq = sc.sc_frame.mq;
    107 #endif
    108 
    109 	mutex_enter(p->p_lock);
    110 	/* Restore signal stack. */
    111 	if (sc.sc_onstack & SS_ONSTACK)
    112 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    113 	else
    114 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    115 
    116 	/* Restore signal mask. */
    117 	native_sigset13_to_sigset(&sc.sc_mask, &mask);
    118 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    119 	mutex_exit(p->p_lock);
    120 
    121 	return (EJUSTRETURN);
    122 }
    123 
    124 #endif /* !_LP64 */
    125