Compat layer for 1k Vax aout, from NetBSD.

1 files changed, 145 insertions, 0 deletions

diff --git a/sys/compat/vax1k/vax1k_exec.c b/sys/compat/vax1k/vax1k_exec.c
new file mode 100644
index 00000000000..a2e37b3916e
--- /dev/null
+++ b/sys/compat/vax1k/vax1k_exec.c
@@ -0,0 +1,145 @@
+/*	$OpenBSD: vax1k_exec.c,v 1.1 2001/11/14 14:37:22 hugh Exp $	*/
+/*	$NetBSD: vax1k_exec.c,v 1.1 1998/08/21 13:25:47 ragge Exp $	*/
+
+/*
+ * Copyright (c) 1993, 1994 Christopher G. Demetriou
+ * 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.
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Christopher G. Demetriou.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without 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.
+ */
+
+/*
+ * Exec glue to provide compatibility with older NetBSD vax1k exectuables.
+ *
+ * Because NetBSD/vax now uses 4k page size, older binaries (that started
+ * on an 1k boundary) cannot be mmap'ed. Therefore they are read in 
+ * (via vn_rdwr) as OMAGIC binaries and executed. This will use a little
+ * bit more memory, but otherwise won't affect the execution speed.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/vnode.h>
+#include <sys/exec.h>
+#include <sys/resourcevar.h>
+
+#include <compat/vax1k/vax1k_exec.h>
+
+int	exec_vax1k_prep_anymagic
+	    __P((struct proc *, struct exec_package *, int));
+
+/*
+ * exec_vax1k_makecmds(): Check if it's an a.out-format executable
+ * with an vax1k magic number.
+ *
+ * Given a proc pointer and an exec package pointer, see if the referent
+ * of the epp is in a.out format.  Just check 'standard' magic numbers for
+ * this architecture.
+ *
+ * This function, in the former case, or the hook, in the latter, is
+ * responsible for creating a set of vmcmds which can be used to build
+ * the process's vm space and inserting them into the exec package.
+ */
+
+int
+exec_vax1k_makecmds(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	u_long midmag, magic;
+	u_short mid;
+	int error;
+	struct exec *execp = epp->ep_hdr;
+
+	if (epp->ep_hdrvalid < sizeof(struct exec))
+		return ENOEXEC;
+
+	midmag = ntohl(execp->a_midmag);
+	mid = (midmag >> 16) & 0x3ff;
+	magic = midmag & 0xffff;
+
+	midmag = mid << 16 | magic;
+
+	switch (midmag) {
+	case (MID_VAX1K << 16) | ZMAGIC:
+		error = exec_vax1k_prep_anymagic(p, epp, 0);
+		break;
+
+	case (MID_VAX1K << 16) | NMAGIC:
+	case (MID_VAX1K << 16) | OMAGIC:
+		error = exec_vax1k_prep_anymagic(p, epp, sizeof(struct exec));
+		break;
+
+	default:
+		error = ENOEXEC;
+	}
+
+	if (error)
+		kill_vmcmds(&epp->ep_vmcmds);
+
+	return error;
+}
+
+/*
+ * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package
+ *
+ * First, set of the various offsets/lengths in the exec package.
+ * Note that all code is mapped RW; no protection, but because it is
+ * only used for compatibility it won't hurt.
+ *
+ */
+int
+exec_vax1k_prep_anymagic(p, epp, off)
+        struct proc *p;
+        struct exec_package *epp;
+	int off;
+{
+	long etmp, tmp;
+        struct exec *execp = epp->ep_hdr;
+
+        epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1);
+	epp->ep_tsize = execp->a_text + execp->a_data;
+	epp->ep_daddr = epp->ep_tsize + epp->ep_taddr;
+	epp->ep_dsize = execp->a_bss;
+        epp->ep_entry = execp->a_entry;
+
+        /* set up command for text segment */
+        NEW_VMCMD(&epp->ep_vmcmds, vax1k_map_readvn,
+	    epp->ep_tsize,  epp->ep_taddr, epp->ep_vp, off,
+	    VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
+
+	tmp = round_page(epp->ep_daddr);
+	etmp = execp->a_bss - (tmp - epp->ep_daddr);
+
+        /* set up command for bss segment */
+	if (etmp > 0)
+	        NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, etmp, tmp, NULLVP, 0,
+		    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+        return exec_setup_stack(p, epp);
+}