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Annotation of XNU/bsd/miscfs/procfs/procfs_fpregs.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*     $NetBSD: procfs_fpregs.c,v 1.3 1994/06/29 06:34:48 cgd Exp $    */
        !            23: 
        !            24: /*
        !            25:  * Copyright (c) 1993 Jan-Simon Pendry
        !            26:  * Copyright (c) 1993
        !            27:  *     The Regents of the University of California.  All rights reserved.
        !            28:  *
        !            29:  * This code is derived from software contributed to Berkeley by
        !            30:  * Jan-Simon Pendry.
        !            31:  *
        !            32:  * Redistribution and use in source and binary forms, with or without
        !            33:  * modification, are permitted provided that the following conditions
        !            34:  * are met:
        !            35:  * 1. Redistributions of source code must retain the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer.
        !            37:  * 2. Redistributions in binary form must reproduce the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer in the
        !            39:  *    documentation and/or other materials provided with the distribution.
        !            40:  * 3. All advertising materials mentioning features or use of this software
        !            41:  *    must display the following acknowledgement:
        !            42:  *     This product includes software developed by the University of
        !            43:  *     California, Berkeley and its contributors.
        !            44:  * 4. Neither the name of the University nor the names of its contributors
        !            45:  *    may be used to endorse or promote products derived from this software
        !            46:  *    without specific prior written permission.
        !            47:  *
        !            48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            58:  * SUCH DAMAGE.
        !            59:  *
        !            60:  *     @(#)procfs_fpregs.c     8.2 (Berkeley) 6/15/94
        !            61:  */
        !            62: 
        !            63: #include <sys/param.h>
        !            64: #include <sys/systm.h>
        !            65: #include <sys/time.h>
        !            66: #include <sys/kernel.h>
        !            67: #include <sys/proc.h>
        !            68: #include <sys/vnode.h>
        !            69: #include <sys/ptrace.h>
        !            70: #include <machine/reg.h>
        !            71: #include <miscfs/procfs/procfs.h>
        !            72: 
        !            73: int
        !            74: procfs_dofpregs(curp, p, pfs, uio)
        !            75:        struct proc *curp;
        !            76:        struct proc *p;
        !            77:        struct pfsnode *pfs;
        !            78:        struct uio *uio;
        !            79: {
        !            80: #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS)
        !            81:        int error;
        !            82:        struct fpreg r;
        !            83:        char *kv;
        !            84:        int kl;
        !            85: 
        !            86:        kl = sizeof(r);
        !            87:        kv = (char *) &r;
        !            88: 
        !            89:        kv += uio->uio_offset;
        !            90:        kl -= uio->uio_offset;
        !            91:        if (kl > uio->uio_resid)
        !            92:                kl = uio->uio_resid;
        !            93: 
        !            94:        if (kl < 0)
        !            95:                error = EINVAL;
        !            96:        else
        !            97:                error = process_read_fpregs(p, &r);
        !            98:        if (error == 0)
        !            99:                error = uiomove(kv, kl, uio);
        !           100:        if (error == 0 && uio->uio_rw == UIO_WRITE) {
        !           101:                if (p->p_stat != SSTOP)
        !           102:                        error = EBUSY;
        !           103:                else
        !           104:                        error = process_write_fpregs(p, &r);
        !           105:        }
        !           106: 
        !           107:        uio->uio_offset = 0;
        !           108:        return (error);
        !           109: #else
        !           110:        return (EINVAL);
        !           111: #endif
        !           112: }
        !           113: 
        !           114: int
        !           115: procfs_validfpregs(p)
        !           116:        struct proc *p;
        !           117: {
        !           118: 
        !           119: #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
        !           120:        return ((p->p_flag & P_SYSTEM) == 0);
        !           121: #else
        !           122:        return (0);
        !           123: #endif
        !           124: }

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