sync

1 files changed, 189 insertions, 0 deletions

diff --git a/sys/compat/common/compat_exec.c b/sys/compat/common/compat_exec.c
new file mode 100644
index 00000000000..f745710a92f
--- /dev/null
+++ b/sys/compat/common/compat_exec.c
@@ -0,0 +1,189 @@
+/*	$NetBSD: compat_exec.c,v 1.1 1996/05/18 15:52:21 christos 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.
+ */
+
+#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 <vm/vm.h>
+
+/*
+ * exec_aout_prep_oldzmagic():
+ *	Prepare the vmcmds to build a vmspace for an old ZMAGIC
+ *	binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
+ *
+ * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
+ * description of operation is there.
+ * There were copies of this in the mac68k, hp300, and i386 ports.
+ */
+int
+exec_aout_prep_oldzmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+
+	epp->ep_taddr = 0;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = epp->ep_taddr + execp->a_text;
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/*
+	 * check if vnode is in open for writing, because we want to
+	 * demand-page out of it.  if it is, don't do it, for various
+	 * reasons
+	 */
+	if ((execp->a_text != 0 || execp->a_data != 0) &&
+	    epp->ep_vp->v_writecount != 0) {
+#ifdef DIAGNOSTIC
+		if (epp->ep_vp->v_flag & VTEXT)
+			panic("exec: a VTEXT vnode has writecount != 0\n");
+#endif
+		return ETXTBSY;
+	}
+	epp->ep_vp->v_flag |= VTEXT;
+
+	/* set up command for text segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
+	    epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */
+	    VM_PROT_READ|VM_PROT_EXECUTE);
+
+	/* set up command for data segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
+	    epp->ep_daddr, epp->ep_vp,
+	    execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+	    epp->ep_daddr + execp->a_data, NULLVP, 0,
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return exec_aout_setup_stack(p, epp);
+}
+
+
+/*
+ * exec_aout_prep_oldnmagic():
+ *	Prepare the vmcmds to build a vmspace for an old NMAGIC
+ *	binary. [BSDI]
+ *
+ * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
+ * at 0.
+ * XXX: There must be a better way to share this code.
+ */
+int
+exec_aout_prep_oldnmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+	long bsize, baddr;
+
+	epp->ep_taddr = 0;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ);
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/* set up command for text segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+	    epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
+	    VM_PROT_READ|VM_PROT_EXECUTE);
+
+	/* set up command for data segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+	    epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+	if (bsize > 0)
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return exec_aout_setup_stack(p, epp);
+}
+
+
+/*
+ * exec_aout_prep_oldomagic():
+ *	Prepare the vmcmds to build a vmspace for an old OMAGIC
+ *	binary. [BSDI]
+ *
+ * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
+ * at 0.
+ * XXX: There must be a better way to share this code.
+ */
+int
+exec_aout_prep_oldomagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+	long dsize, bsize, baddr;
+
+	epp->ep_taddr = 0;
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = epp->ep_taddr + execp->a_text;
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/* set up command for text and data segments */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
+	    execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
+	    sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+	if (bsize > 0)
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/*
+	 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
+	 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
+	 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
+	 * respectively to page boundaries.
+	 * Compensate `ep_dsize' for the amount of data covered by the last
+	 * text page. 
+	 */
+	dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
+	epp->ep_dsize = (dsize > 0) ? dsize : 0;
+	return exec_aout_setup_stack(p, epp);
+}