First incarnation of our Linux emulator or rather compatibility code.

This first shot only incorporaties so much functionality that DOOM
can run (the X version), signal handling is VERY weak, so is many
other things. But it meets my milestone number one (you guessed it
- running DOOM).

Uses /compat/linux as prefix for loading shared libs, so it won't
conflict with our own libs.

Kernel must be compiled with "options COMPAT_LINUX" for this to work.

1 files changed, 273 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_stats.c b/sys/compat/linux/linux_stats.c
new file mode 100644
index 0000000..1dbfcf1
--- /dev/null
+++ b/sys/compat/linux/linux_stats.c
@@ -0,0 +1,273 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  $Id: linux_stats.c,v 1.3 1995/06/08 13:50:52 sos Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/dirent.h>
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/proc.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/stat.h>
+#include <sys/vnode.h>
+
+#include <machine/cpu.h>
+#include <machine/psl.h>
+#include <machine/reg.h>
+
+#include <i386/linux/linux.h>
+
+struct linux_newstat {
+    unsigned short stat_dev;
+    unsigned short __pad1;
+    unsigned long stat_ino;
+    unsigned short stat_mode;
+    unsigned short stat_nlink;
+    unsigned short stat_uid;
+    unsigned short stat_gid;
+    unsigned short stat_rdev;
+    unsigned short __pad2;
+    unsigned long stat_size;
+    unsigned long stat_blksize;
+    unsigned long stat_blocks;
+    unsigned long stat_atime;
+    unsigned long __unused1;
+    unsigned long stat_mtime;
+    unsigned long __unused2;
+    unsigned long stat_ctime;
+    unsigned long __unused3;
+    unsigned long __unused4;
+    unsigned long __unused5;
+};
+
+struct linux_newstat_args {
+    char *path;
+    struct linux_newstat *buf;
+};
+
+static int
+newstat_copyout(struct stat *buf, void *ubuf)
+{
+    struct linux_newstat tbuf;
+
+    tbuf.stat_dev = (buf->st_dev & 0xff) | ((buf->st_dev & 0xff00)<<10);
+    tbuf.stat_ino = buf->st_ino;
+    tbuf.stat_mode = buf->st_mode;
+    tbuf.stat_nlink = buf->st_nlink;
+    tbuf.stat_uid = buf->st_uid;
+    tbuf.stat_gid = buf->st_gid;
+    tbuf.stat_rdev = buf->st_rdev;
+    tbuf.stat_size = buf->st_size;
+    tbuf.stat_atime = buf->st_atime;
+    tbuf.stat_mtime = buf->st_mtime;
+    tbuf.stat_ctime = buf->st_ctime;
+    tbuf.stat_blksize = buf->st_blksize;
+    tbuf.stat_blocks = buf->st_blocks;
+    return copyout(&tbuf, ubuf, sizeof(tbuf));
+}
+
+int
+linux_newstat(struct proc *p, struct linux_newstat_args *args, int *retval)
+{
+    struct stat buf;
+    struct linux_newstat tbuf;
+    struct nameidata nd;
+    int error;
+  
+#ifdef DEBUG
+    printf("Linux-emul(%d): newstat(%s, *)\n", p->p_pid, args->path);
+#endif
+    NDINIT(&nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_USERSPACE, args->path, p);
+    error = namei(&nd);
+    if (!error) {
+	error = vn_stat(nd.ni_vp, &buf, p);
+	vput(nd.ni_vp);
+    }
+    if (!error) 
+	error = newstat_copyout(&buf, args->buf);
+    return error;
+}
+
+int
+linux_newlstat(struct proc *p, struct linux_newstat_args *args, int *retval)
+{
+    struct stat buf;
+    struct linux_newstat tbuf;
+    struct nameidata nd;
+    int error;
+  
+#ifdef DEBUG
+    printf("Linux-emul(%d): newlstat(%s, *)\n", p->p_pid, args->path);
+#endif
+    NDINIT(&nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_USERSPACE, args->path, p);
+    error = namei(&nd);
+    if (!error) {
+	error = vn_stat(nd.ni_vp, &buf, p);
+	vput(nd.ni_vp);
+    }
+    if (!error)
+	error = newstat_copyout(&buf, args->buf);
+    return error;
+}
+
+struct linux_newfstat_args {
+    int fd;
+    struct linux_newstat *buf;
+};
+
+int
+linux_newfstat(struct proc *p, struct linux_newfstat_args *args, int *retval)
+{
+    struct linux_newstat tbuf;
+    struct filedesc *fdp = p->p_fd;
+    struct file *fp;
+    struct stat buf;
+    int error;
+  
+#ifdef DEBUG
+    printf("Linux-emul(%d): newlstat(%d, *)\n", p->p_pid, args->fd);
+#endif
+    if ((unsigned)args->fd >= fdp->fd_nfiles 
+	|| (fp = fdp->fd_ofiles[args->fd]) == NULL)
+	return EBADF;
+    switch (fp->f_type) {
+    case DTYPE_VNODE:
+	error = vn_stat((struct vnode *)fp->f_data, &buf, p);
+	break;
+    case DTYPE_SOCKET:
+	error = soo_stat((struct socket *)fp->f_data, &buf);
+	break;
+    default:
+	panic("LINUX newfstat");
+    }
+    if (!error)
+	error = newstat_copyout(&buf, args->buf);
+    return error;
+}
+
+struct linux_statfs {
+	long ftype;
+	long fbsize;
+	long fblocks;
+	long fbfree;
+	long fbavail;
+	long ffiles;
+	long fffree;
+	linux_fsid_t ffsid;
+	long fnamelen;
+	long fspare[6];
+};
+
+
+struct linux_statfs_args {
+	char *path;
+	struct statfs *buf;
+};
+
+int
+linux_statfs(struct proc *p, struct linux_statfs_args *args, int *retval)
+{
+	struct mount *mp;
+	struct nameidata *ndp;
+	struct statfs *bsd_statfs;
+	struct nameidata nd;
+	struct linux_statfs linux_statfs;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): statfs(%s, *)\n", p->p_pid, args->path);
+#endif
+	ndp = &nd;
+  	ndp->ni_cnd.cn_nameiop = LOOKUP;
+	ndp->ni_cnd.cn_flags = FOLLOW;
+	ndp->ni_cnd.cn_proc = curproc;
+	ndp->ni_cnd.cn_cred = curproc->p_cred->pc_ucred;
+	ndp->ni_segflg = UIO_USERSPACE;
+	ndp->ni_dirp = args->path;
+	if (error = namei(ndp))
+		return error;
+	mp = ndp->ni_vp->v_mount;
+	bsd_statfs = &mp->mnt_stat;
+	vrele(ndp->ni_vp);
+	if (error = VFS_STATFS(mp, bsd_statfs, p))
+		return error;
+	bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	linux_statfs.ftype = bsd_statfs->f_type;
+	linux_statfs.fbsize = bsd_statfs->f_bsize;
+	linux_statfs.fblocks = bsd_statfs->f_blocks;
+	linux_statfs.fbfree = bsd_statfs->f_bfree;
+	linux_statfs.fbavail = bsd_statfs->f_bavail;
+  	linux_statfs.fffree = bsd_statfs->f_ffree;
+	linux_statfs.ffiles = bsd_statfs->f_files;
+	linux_statfs.ffsid.val[0] = bsd_statfs->f_fsid.val[0];
+	linux_statfs.ffsid.val[1] = bsd_statfs->f_fsid.val[1];
+	linux_statfs.fnamelen = MAXNAMLEN;
+	return copyout((caddr_t)&linux_statfs, (caddr_t)args->buf,
+		       sizeof(struct linux_statfs));
+}
+
+struct linux_fstatfs_args {
+	int fd;
+	struct statfs *buf;
+};
+
+int
+linux_fstatfs(struct proc *p, struct linux_fstatfs_args *args, int *retval)
+{
+	struct file *fp;
+	struct mount *mp;
+	struct statfs *bsd_statfs;
+	struct linux_statfs linux_statfs;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): fstatfs(%d, *)\n", p->p_pid, args->fd);
+#endif
+	if (error = getvnode(p->p_fd, args->fd, &fp))
+		return error;
+	mp = ((struct vnode *)fp->f_data)->v_mount;
+	bsd_statfs = &mp->mnt_stat;
+	if (error = VFS_STATFS(mp, bsd_statfs, p))
+		return error;
+	bsd_statfs->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	linux_statfs.ftype = bsd_statfs->f_type;
+	linux_statfs.fbsize = bsd_statfs->f_bsize;
+	linux_statfs.fblocks = bsd_statfs->f_blocks;
+	linux_statfs.fbfree = bsd_statfs->f_bfree;
+	linux_statfs.fbavail = bsd_statfs->f_bavail;
+  	linux_statfs.fffree = bsd_statfs->f_ffree;
+	linux_statfs.ffiles = bsd_statfs->f_files;
+	linux_statfs.ffsid.val[0] = bsd_statfs->f_fsid.val[0];
+	linux_statfs.ffsid.val[1] = bsd_statfs->f_fsid.val[1];
+	linux_statfs.fnamelen = MAXNAMLEN;
+	return copyout((caddr_t)&linux_statfs, (caddr_t)args->buf,
+		       sizeof(struct linux_statfs));
+}