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      1 /*	$NetBSD: compat_13_machdep.c,v 1.19 2021/02/01 19:31:34 skrll Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994-1998 Mark Brinicombe.
      5  * Copyright (c) 1994 Brini.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software written for Brini by Mark Brinicombe
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by Mark Brinicombe
     21  *	for the NetBSD Project.
     22  * 4. The name of the company nor the name of the author may be used to
     23  *    endorse or promote products derived from this software without specific
     24  *    prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     27  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     28  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     29  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     30  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     31  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     32  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 
     41 __KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.19 2021/02/01 19:31:34 skrll Exp $");
     42 
     43 #include <sys/systm.h>
     44 #include <sys/signalvar.h>
     45 #include <sys/kernel.h>
     46 #include <sys/proc.h>
     47 #include <sys/mount.h>
     48 #include <sys/syscallargs.h>
     49 
     50 #include <compat/sys/signal.h>
     51 #include <compat/sys/signalvar.h>
     52 
     53 #include <arm/locore.h>
     54 
     55 int
     56 compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
     57 {
     58 	/* {
     59 		syscallarg(struct sigcontext13 *) sigcntxp;
     60 	} */
     61 	struct sigcontext13 *scp, context;
     62 	struct trapframe * const tf = lwp_trapframe(l);
     63 	struct proc * const p = l->l_proc;
     64 	sigset_t mask;
     65 
     66 	/*
     67 	 * The trampoline code hands us the context.
     68 	 * It is unsafe to keep track of it ourselves, in the event that a
     69 	 * program jumps out of a signal handler.
     70 	 */
     71 	scp = SCARG(uap, sigcntxp);
     72 	if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
     73 		return (EFAULT);
     74 
     75 	/*
     76 	 * Make sure the processor mode has not been tampered with and
     77 	 * interrupts have not been disabled.
     78 	 */
     79 	if (!VALID_PSR(context.sc_spsr))
     80 		return EINVAL;
     81 
     82 	/* Restore register context. */
     83 	tf->tf_r0    = context.sc_r0;
     84 	tf->tf_r1    = context.sc_r1;
     85 	tf->tf_r2    = context.sc_r2;
     86 	tf->tf_r3    = context.sc_r3;
     87 	tf->tf_r4    = context.sc_r4;
     88 	tf->tf_r5    = context.sc_r5;
     89 	tf->tf_r6    = context.sc_r6;
     90 	tf->tf_r7    = context.sc_r7;
     91 	tf->tf_r8    = context.sc_r8;
     92 	tf->tf_r9    = context.sc_r9;
     93 	tf->tf_r10   = context.sc_r10;
     94 	tf->tf_r11   = context.sc_r11;
     95 	tf->tf_r12   = context.sc_r12;
     96 	tf->tf_usr_sp = context.sc_usr_sp;
     97 	tf->tf_usr_lr = context.sc_usr_lr;
     98 	tf->tf_svc_lr = context.sc_svc_lr;
     99 	tf->tf_pc    = context.sc_pc;
    100 	tf->tf_spsr  = context.sc_spsr;
    101 
    102 	mutex_enter(p->p_lock);
    103 
    104 	/* Restore signal stack. */
    105 	if (context.sc_onstack & SS_ONSTACK)
    106 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    107 	else
    108 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    109 
    110 	/* Restore signal mask. */
    111 	native_sigset13_to_sigset(&context.sc_mask, &mask);
    112 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    113 
    114 	mutex_exit(p->p_lock);
    115 
    116 	return (EJUSTRETURN);
    117 }
    118