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userret.h revision 1.28.4.1 
      1 /*	$NetBSD: userret.h,v 1.28.4.1 2015/07/17 03:34:01 snj 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 "opt_ppcarch.h"
     35 #include "opt_altivec.h"
     36 
     37 #include <sys/userret.h>
     38 #include <sys/ras.h>
     39 
     40 #include <powerpc/fpu.h>
     41 #include <powerpc/psl.h>
     42 
     43 #ifdef PPC_BOOKE
     44 #include <powerpc/spr.h>
     45 #include <powerpc/booke/spr.h>
     46 #endif
     47 
     48 /*
     49  * Define the code needed before returning to user mode, for
     50  * trap and syscall.
     51  */
     52 static __inline void
     53 userret(struct lwp *l, struct trapframe *tf)
     54 {
     55 	KASSERTMSG((tf == trapframe(curlwp)),
     56 	   "tf=%p, trapframe(curlwp)=%p\n", tf, trapframe(curlwp));
     57 
     58 	/* Invoke MI userret code */
     59 	mi_userret(l);
     60 
     61 	KASSERTMSG((tf->tf_srr1 & PSL_PR) != 0,
     62 	    "tf=%p: srr1 (%#lx): PSL_PR isn't set!",
     63 	    tf, tf->tf_srr1);
     64 	KASSERTMSG((tf->tf_srr1 & PSL_FP) == 0
     65 	    || l->l_cpu->ci_data.cpu_pcu_curlwp[PCU_FPU] == l,
     66 	    "tf=%p: srr1 (%#lx): PSL_FP set but FPU curlwp %p is not curlwp %p!",
     67 	    tf, tf->tf_srr1, l->l_cpu->ci_data.cpu_pcu_curlwp[PCU_FPU], l);
     68 
     69 	/* clear SRR1 status bits */
     70 	tf->tf_srr1 &= (PSL_USERSRR1|PSL_FP|PSL_VEC);
     71 
     72 #ifdef ALTIVEC
     73 	/*
     74 	 * We need to manually restore PSL_VEC each time we return
     75 	 * to user mode since PSL_VEC isn't always preserved in SRR1.
     76 	 * We keep a copy of it in md_flags to make restoring easier.
     77 	 */
     78 	tf->tf_srr1 |= l->l_md.md_flags & PSL_VEC;
     79 #endif
     80 #ifdef PPC_BOOKE
     81 	/*
     82 	 * BookE doesn't have PSL_SE but it does have a debug instruction
     83 	 * completion exception but it needs PSL_DE to fire.  Instead we
     84 	 * use IAC1/IAC2 to match the next PC.
     85 	 */
     86 	if (__predict_false(tf->tf_srr1 & PSL_SE)) {
     87 		tf->tf_srr1 &= ~PSL_SE;
     88 		extern void booke_sstep(struct trapframe *); /* ugly */
     89 		booke_sstep(tf);
     90 	}
     91 #endif
     92 
     93 #ifdef __HAVE_RAS
     94 	/*
     95 	 * Check to see if a RAS was interrupted and restart it if it was.
     96 	 */
     97 	struct proc * const p = l->l_proc;
     98 	if (__predict_false(p->p_raslist != NULL)) {
     99 		void * const ras_pc = ras_lookup(p, (void *) tf->tf_srr0);
    100 		if (ras_pc != (void *) -1)
    101 			tf->tf_srr0 = (vaddr_t) ras_pc;
    102 	}
    103 #endif
    104 }
    105