Mega-commit for Linux emulator update.. This has been stress tested under

netscape-2.0 for Linux running all the Java stuff.  The scrollbars are now
working, at least on my machine. (whew! :-)

I'm uncomfortable with the size of this commit, but it's too
inter-dependant to easily seperate out.

The main changes:

COMPAT_LINUX is *GONE*.  Most of the code has been moved out of the i386
machine dependent section into the linux emulator itself.  The int 0x80
syscall code was almost identical to the lcall 7,0 code and a minor tweak
allows them to both be used with the same C code.  All kernels can now
just modload the lkm and it'll DTRT without having to rebuild the kernel
first.  Like IBCS2, you can statically compile it in with "options LINUX".

A pile of new syscalls implemented, including getdents(), llseek(),
readv(), writev(), msync(), personality().  The Linux-ELF libraries want
to use some of these.

linux_select() now obeys Linux semantics, ie: returns the time remaining
of the timeout value rather than leaving it the original value.

Quite a few bugs removed, including incorrect arguments being used in
syscalls..  eg:  mixups between passing the sigset as an int, vs passing
it as a pointer and doing a copyin(), missing return values, unhandled
cases, SIOC* ioctls, etc.

The build for the code has changed.  i386/conf/files now knows how
to build linux_genassym and generate linux_assym.h on the fly.

Supporting changes elsewhere in the kernel:

The user-mode signal trampoline has moved from the U area to immediately
below the top of the stack (below PS_STRINGS).  This allows the different
binary emulations to have their own signal trampoline code (which gets rid
of the hardwired syscall 103 (sigreturn on BSD, syslog on Linux)) and so
that the emulator can provide the exact "struct sigcontext *" argument to
the program's signal handlers.

The sigstack's "ss_flags" now uses SS_DISABLE and SS_ONSTACK flags, which
have the same values as the re-used SA_DISABLE and SA_ONSTACK which are
intended for sigaction only.  This enables the support of a SA_RESETHAND
flag to sigaction to implement the gross SYSV and Linux SA_ONESHOT signal
semantics where the signal handler is reset when it's triggered.

makesyscalls.sh no longer appends the struct sysentvec on the end of the
generated init_sysent.c code.  It's a lot saner to have it in a seperate
file rather than trying to update the structure inside the awk script. :-)

At exec time, the dozen bytes or so of signal trampoline code are copied
to the top of the user's stack, rather than obtaining the trampoline code
the old way by getting a clone of the parent's user area.  This allows
Linux and native binaries to freely exec each other without getting
trampolines mixed up.

1 files changed, 354 insertions, 43 deletions

diff --git a/sys/compat/linux/linux_file.c b/sys/compat/linux/linux_file.c
index 0918f22..93932df 100644
--- a/sys/compat/linux/linux_file.c
+++ b/sys/compat/linux/linux_file.c
@@ -25,7 +25,7 @@
  * (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_file.c,v 1.4 1995/11/22 07:43:45 bde Exp $
+ *  $Id: linux_file.c,v 1.5 1995/12/15 03:06:50 peter Exp $
  */
 
 #include <sys/param.h>
@@ -41,16 +41,15 @@
 #include <sys/malloc.h>
 #include <sys/exec.h>
 #include <sys/dirent.h>
+#include <sys/sysproto.h>
+#include <sys/conf.h>
+#include <sys/tty.h>
 
 #include <ufs/ufs/dir.h>
 
 #include <i386/linux/linux.h>
-#include <i386/linux/sysproto.h>
-
-struct linux_creat_args {
-    char    *path;
-    int mode;
-};
+#include <i386/linux/linux_proto.h>
+#include <i386/linux/linux_util.h>
 
 int
 linux_creat(struct proc *p, struct linux_creat_args *args, int *retval)
@@ -60,6 +59,10 @@ linux_creat(struct proc *p, struct linux_creat_args *args, int *retval)
 	int flags;
 	int mode;
     } */ bsd_open_args;
+    caddr_t sg;
+
+    sg = stackgap_init();
+    CHECKALTCREAT(p, &sg, args->path);
 
 #ifdef DEBUG
     printf("Linux-emul(%d): creat(%s, %d)\n", 
@@ -71,12 +74,6 @@ linux_creat(struct proc *p, struct linux_creat_args *args, int *retval)
     return open(p, &bsd_open_args, retval);
 }
 
-struct linux_open_args {
-    char *path;
-    int flags;
-    int mode;
-};
-
 int
 linux_open(struct proc *p, struct linux_open_args *args, int *retval)
 {
@@ -86,7 +83,15 @@ linux_open(struct proc *p, struct linux_open_args *args, int *retval)
 	int mode;
     } */ bsd_open_args;
     int error;
+    caddr_t sg;
+
+    sg = stackgap_init();
     
+    if (args->flags & LINUX_O_CREAT)
+	CHECKALTCREAT(p, &sg, args->path);
+    else
+	CHECKALTEXIST(p, &sg, args->path);
+
 #ifdef DEBUG
     printf("Linux-emul(%d): open(%s, 0x%x, 0x%x)\n", 
 	   p->p_pid, args->path, args->flags, args->mode);
@@ -128,6 +133,10 @@ linux_open(struct proc *p, struct linux_open_args *args, int *retval)
 	if (fp->f_type == DTYPE_VNODE)
 	    (fp->f_ops->fo_ioctl)(fp, TIOCSCTTY, (caddr_t) 0, p);
     }
+#ifdef DEBUG
+    printf("Linux-emul(%d): open returns error %d\n", 
+	   p->p_pid, error);
+#endif
     return error;
 }
 
@@ -179,12 +188,6 @@ bsd_to_linux_flock(struct flock *bsd_flock, struct linux_flock *linux_flock)
     linux_flock->l_pid = (linux_pid_t)bsd_flock->l_pid;
 }
 
-struct linux_fcntl_args {
-    int fd;
-    int cmd;
-    int arg;
-};
-
 int
 linux_fcntl(struct proc *p, struct linux_fcntl_args *args, int *retval)
 {
@@ -195,8 +198,19 @@ linux_fcntl(struct proc *p, struct linux_fcntl_args *args, int *retval)
 	int arg;
     } */ fcntl_args; 
     struct linux_flock linux_flock;
-    struct flock *bsd_flock = 
-	(struct flock *)ua_alloc_init(sizeof(struct flock));
+    struct flock *bsd_flock;
+    struct filedesc *fdp;
+    struct file *fp;
+    struct vnode *vp;
+    struct vattr va;
+    long pgid;
+    struct pgrp *pgrp;
+    struct tty *tp, *(*d_tty) __P((dev_t));
+    caddr_t sg;
+
+    sg = stackgap_init();
+    bsd_flock = (struct flock *)stackgap_alloc(&sg, sizeof(struct flock));
+    d_tty = NULL;
 
 #ifdef DEBUG
     printf("Linux-emul(%d): fcntl(%d, %08x, *)\n",
@@ -269,22 +283,51 @@ linux_fcntl(struct proc *p, struct linux_fcntl_args *args, int *retval)
 	return fcntl(p, &fcntl_args, retval);
 
     case LINUX_F_SETOWN:
-	fcntl_args.cmd = F_SETOWN;
-	return fcntl(p, &fcntl_args, retval);
-
     case LINUX_F_GETOWN:
-	fcntl_args.cmd = F_GETOWN;
-	return fcntl(p, &fcntl_args, retval);
+	/*
+	 * We need to route around the normal fcntl() for these calls,
+	 * since it uses TIOC{G,S}PGRP, which is too restrictive for
+	 * Linux F_{G,S}ETOWN semantics. For sockets, this problem
+	 * does not exist.
+	 */
+	fdp = p->p_fd;
+	if ((u_int)args->fd >= fdp->fd_nfiles ||
+		(fp = fdp->fd_ofiles[args->fd]) == NULL)
+	    return EBADF;
+	if (fp->f_type == DTYPE_SOCKET) {
+	    fcntl_args.cmd = args->cmd == LINUX_F_SETOWN ? F_SETOWN : F_GETOWN;
+	    return fcntl(p, &fcntl_args, retval); 
+	}
+	vp = (struct vnode *)fp->f_data;
+	if (vp->v_type != VCHR)
+	    return EINVAL;
+	if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
+	    return error;
+
+	d_tty = cdevsw[major(va.va_rdev)]->d_devtotty;
+	if (!d_tty || (!(tp = (*d_tty)(va.va_rdev))))
+	    return EINVAL;
+	if (args->cmd == LINUX_F_GETOWN) {
+	    retval[0] = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID;
+	    return 0;
+	}
+	if ((long)args->arg <= 0) {
+	    pgid = -(long)args->arg;
+	} else {
+	    struct proc *p1 = pfind((long)args->arg);
+	    if (p1 == 0)
+		return (ESRCH);
+	    pgid = (long)p1->p_pgrp->pg_id;
+	}
+	pgrp = pgfind(pgid);
+	if (pgrp == NULL || pgrp->pg_session != p->p_session)
+	    return EPERM;
+	tp->t_pgrp = pgrp;
+	return 0;
     }
     return EINVAL;
 }
 
-struct linux_lseek_args {
-    int fdes;
-    unsigned long off;
-    int whence;
-};
-
 int
 linux_lseek(struct proc *p, struct linux_lseek_args *args, int *retval)
 {
@@ -308,6 +351,34 @@ linux_lseek(struct proc *p, struct linux_lseek_args *args, int *retval)
     return error;
 }
 
+int
+linux_llseek(struct proc *p, struct linux_llseek_args *args, int *retval)
+{
+	struct lseek_args bsd_args;
+	int error;
+	off_t off;
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): llseek(%d, %d:%d, %d)\n",
+	   p->p_pid, args->fd, args->ohigh, args->olow, args->whence);
+#endif
+	off = (args->olow) | (((off_t) args->ohigh) << 32);
+
+	bsd_args.fd = args->fd;
+	bsd_args.offset = off;
+	bsd_args.whence = args->whence;
+
+	if ((error = lseek(p, &bsd_args, retval)))
+		return error;
+
+	if ((error = copyout(retval, (caddr_t)args->res, sizeof (off_t))))
+		return error;
+
+	retval[0] = 0;
+	return 0;
+}
+
+
 struct linux_dirent {
     long dino;
     linux_off_t doff;
@@ -318,15 +389,20 @@ struct linux_dirent {
 #define LINUX_RECLEN(de,namlen) \
     ALIGN((((char *)&(de)->dname - (char *)de) + (namlen) + 1))
 
-struct linux_readdir_args {
-    int fd;
-    struct linux_dirent *dent;
-    unsigned int count;
-};
-
 int
 linux_readdir(struct proc *p, struct linux_readdir_args *args, int *retval)
 {
+	struct linux_getdents_args lda;
+
+	lda.fd = args->fd;
+	lda.dent = args->dent;
+	lda.count = 1;
+	return linux_getdents(p, &lda, retval);
+}
+
+int
+linux_getdents(struct proc *p, struct linux_getdents_args *args, int *retval)
+{
     register struct dirent *bdp;
     struct vnode *vp;
     caddr_t inp, buf;		/* BSD-format */
@@ -342,12 +418,12 @@ linux_readdir(struct proc *p, struct linux_readdir_args *args, int *retval)
     int buflen, error, eofflag, nbytes, justone, blockoff;
 
 #ifdef DEBUG
-    printf("Linux-emul(%d): readdir(%d, *, %d)\n",
+    printf("Linux-emul(%d): getdents(%d, *, %d)\n",
 	   p->p_pid, args->fd, args->count);
 #endif
     if ((error = getvnode(p->p_fd, args->fd, &fp)) != 0) {
 	return (error);
-}
+    }
 
     if ((fp->f_flag & FREAD) == 0)
 	return (EBADF);
@@ -390,7 +466,7 @@ again:
 			(u_int **) NULL);
     if (error) {
 	goto out;
-}
+    }
 
     inp = buf;
     inp += blockoff;
@@ -398,7 +474,7 @@ again:
     resid = nbytes;
     if ((len = buflen - auio.uio_resid - blockoff) == 0) {
 	goto eof;
-      }
+    }
 
     while (len > 0) {
 	bdp = (struct dirent *) inp;
@@ -426,7 +502,7 @@ again:
 	strcpy(linux_dirent.dname, bdp->d_name);
 	if ((error = copyout((caddr_t)&linux_dirent, outp, linuxreclen))) {
 	    goto out;
-	  }
+	}
 	inp += reclen;
 	off += reclen;
 	outp += linuxreclen;
@@ -450,3 +526,238 @@ out:
     free(buf, M_TEMP);
     return error;
 }
+
+/*
+ * These exist mainly for hooks for doing /compat/linux translation.
+ */
+
+int
+linux_access(struct proc *p, struct linux_access_args *args, int *retval)
+{
+	struct access_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): access(%s, %d)\n", 
+	    p->p_pid, args->path, args->flags);
+#endif
+	bsd.path = args->path;
+	bsd.flags = args->flags;
+
+	return access(p, &bsd, retval);
+}
+
+int
+linux_unlink(struct proc *p, struct linux_unlink_args *args, int *retval)
+{
+	struct unlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): unlink(%s)\n", 
+	   p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return unlink(p, &bsd, retval);
+}
+
+int
+linux_chdir(struct proc *p, struct linux_chdir_args *args, int *retval)
+{
+	struct chdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): chdir(%s)\n", 
+	   p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return chdir(p, &bsd, retval);
+}
+
+int
+linux_chmod(struct proc *p, struct linux_chmod_args *args, int *retval)
+{
+	struct chmod_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): chmod(%s, %d)\n", 
+	    p->p_pid, args->path, args->mode);
+#endif
+	bsd.path = args->path;
+	bsd.mode = args->mode;
+
+	return chmod(p, &bsd, retval);
+}
+
+int
+linux_chown(struct proc *p, struct linux_chown_args *args, int *retval)
+{
+	struct chown_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): chown(%s, %d, %d)\n", 
+	    p->p_pid, args->path, args->uid, args->gid);
+#endif
+	bsd.path = args->path;
+	/* XXX size casts here */
+	bsd.uid = args->uid;
+	bsd.gid = args->gid;
+
+	return chown(p, &bsd, retval);
+}
+
+int
+linux_mkdir(struct proc *p, struct linux_mkdir_args *args, int *retval)
+{
+	struct mkdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTCREAT(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): mkdir(%s, %d)\n", 
+	    p->p_pid, args->path, args->mode);
+#endif
+	bsd.path = args->path;
+	bsd.mode = args->mode;
+
+	return mkdir(p, &bsd, retval);
+}
+
+int
+linux_rmdir(struct proc *p, struct linux_rmdir_args *args, int *retval)
+{
+	struct rmdir_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): rmdir(%s)\n", 
+	    p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return rmdir(p, &bsd, retval);
+}
+
+int
+linux_rename(struct proc *p, struct linux_rename_args *args, int *retval)
+{
+	struct rename_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->from);
+	CHECKALTCREAT(p, &sg, args->to);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): rename(%s, %s)\n", 
+	    p->p_pid, args->from, args->to);
+#endif
+	bsd.from = args->from;
+	bsd.to = args->to;
+
+	return rename(p, &bsd, retval);
+}
+
+int
+linux_symlink(struct proc *p, struct linux_symlink_args *args, int *retval)
+{
+	struct symlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+	CHECKALTCREAT(p, &sg, args->to);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): symlink(%s, %s)\n", 
+	    p->p_pid, args->path, args->to);
+#endif
+	bsd.path = args->path;
+	bsd.link = args->to;
+
+	return symlink(p, &bsd, retval);
+}
+
+int
+linux_execve(struct proc *p, struct linux_execve_args *args, int *retval)
+{
+	struct execve_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): execve(%s)\n", 
+	    p->p_pid, args->path);
+#endif
+	bsd.fname = args->path;
+	bsd.argv = args->argp;
+	bsd.envv = args->envp;
+
+	return execve(p, &bsd, retval);
+}
+
+int
+linux_readlink(struct proc *p, struct linux_readlink_args *args, int *retval)
+{
+	struct readlink_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->name);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): readlink(%s, 0x%x, %d)\n", 
+	    p->p_pid, args->name, args->buf, args->count);
+#endif
+	bsd.path = args->name;
+	bsd.buf = args->buf;
+	bsd.count = args->count;
+
+	return readlink(p, &bsd, retval);
+}
+
+int
+linux_truncate(struct proc *p, struct linux_truncate_args *args, int *retval)
+{
+	struct otruncate_args bsd;
+	caddr_t sg;
+
+	sg = stackgap_init();
+	CHECKALTEXIST(p, &sg, args->path);
+
+#ifdef DEBUG
+        printf("Linux-emul(%d): truncate(%s)\n", 
+	    p->p_pid, args->path);
+#endif
+	bsd.path = args->path;
+
+	return otruncate(p, &bsd, retval);
+}
+