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userret.h revision 1.13 
      1 /*	$NetBSD: userret.h,v 1.13 2012/07/08 20:14:11 dsl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah Hdr: trap.c 1.32 91/04/06
     37  *
     38  *	@(#)trap.c	8.5 (Berkeley) 1/11/94
     39  */
     40 
     41 #ifndef _SH3_USERRET_H_
     42 #define	_SH3_USERRET_H_
     43 
     44 #include <sys/userret.h>
     45 
     46 #include <sh3/ubcreg.h>
     47 #include "opt_ptrace.h"
     48 
     49 
     50 static __inline void
     51 userret(struct lwp *l)
     52 {
     53 
     54 	/* Invoke MI userret code */
     55 	mi_userret(l);
     56 
     57 #ifdef PTRACE
     58 	/* Check if lwp is being PT_STEP'ed */
     59 	if (l->l_md.md_flags & MDL_SSTEP) {
     60 		struct trapframe *tf = l->l_md.md_regs;
     61 
     62 		/*
     63 		 * Channel A is set up for single stepping in sh_cpu_init().
     64 		 * Before RTE we write tf_ubc to BBRA and tf_spc to BARA.
     65 		 */
     66 #ifdef SH3
     67 		if (CPU_IS_SH3) {
     68 			tf->tf_ubc = UBC_CYCLE_INSN | UBC_CYCLE_READ
     69 				| SH3_UBC_CYCLE_CPU;
     70 	}
     71 #endif
     72 #ifdef SH4
     73 		if (CPU_IS_SH4) {
     74 			tf->tf_ubc = UBC_CYCLE_INSN | UBC_CYCLE_READ;
     75 		}
     76 #endif
     77 	}
     78 #endif /* PTRACE */
     79 }
     80 
     81 #endif /* !_SH3_USERRET_H_ */
     82