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userret.h revision 1.2.2.3 
      1 /*	$NetBSD: userret.h,v 1.2.2.3 2002/08/06 22:59:39 nathanw 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 /*
     35  * Define the code needed before returning to user mode, for
     36  * trap and syscall.
     37  */
     38 static __inline void
     39 userret(struct lwp *l, struct trapframe *frame)
     40 {
     41 	struct cpu_info *ci = curcpu();
     42 	struct pcb *pcb;
     43 	int sig;
     44 
     45 	/* Take pending signals. */
     46 	while ((sig = CURSIG(l)) != 0) {
     47 		postsig(sig);
     48 	}
     49 
     50 	/* Invoke per-process kernel-exit handling, if any */
     51 	if (l->l_proc->p_userret)
     52 		(l->l_proc->p_userret)(l, l->l_proc->p_userret_arg);
     53 
     54 	/* Invoke any pending upcalls */
     55 	if (l->l_flag & L_SA_UPCALL)
     56 		sa_upcall_userret(l);
     57 
     58 	pcb = &l->l_addr->u_pcb;
     59 
     60 	/*
     61 	 * If someone stole the fp or vector unit while we were away,
     62 	 * disable it
     63 	 */
     64 #ifdef PPC_HAS_FPU
     65 	if ((pcb->pcb_flags & PCB_FPU) &&
     66 	    (l != ci->ci_fpulwp || pcb->pcb_fpcpu != ci)) {
     67 		frame->srr1 &= ~PSL_FP;
     68 	}
     69 #endif
     70 #ifdef ALTIVEC
     71 	if ((pcb->pcb_flags & PCB_ALTIVEC) &&
     72 	    (l != ci->ci_veclwp || pcb->pcb_veccpu != ci)) {
     73 		frame->srr1 &= ~PSL_VEC;
     74 	}
     75 
     76 	/*
     77 	 * If the new process isn't the current AltiVec process on this
     78 	 * cpu, we need to stop any data streams that are active (since
     79 	 * it will be a different address space).
     80 	 */
     81 	if (ci->ci_vecproc != NULL && ci->ci_vecproc != l) {
     82 		__asm __volatile("dssall;sync");
     83 	}
     84 #endif
     85 
     86 	ci->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri;
     87 }
     88