ELF64

1 files changed, 762 insertions, 0 deletions

diff --git a/sys/kern/exec_elf64.c b/sys/kern/exec_elf64.c
new file mode 100644
index 00000000000..9285f12f447
--- /dev/null
+++ b/sys/kern/exec_elf64.c
@@ -0,0 +1,762 @@
+/*	$OpenBSD: exec_elf64.c,v 1.1 1999/09/10 12:24:27 kstailey Exp $	*/
+
+/*
+ * Copyright (c) 1996 Per Fogelstrom
+ * All rights reserved.
+ *
+ * Copyright (c) 1994 Christos Zoulas
+ * 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. 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/kernel.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/exec.h>
+
+#if defined(_KERN_DO_ELF64)
+
+#include <sys/exec_elf.h>
+#include <sys/exec_olf.h>
+#include <sys/file.h>
+#include <sys/syscall.h>
+#include <sys/signalvar.h>
+#include <sys/stat.h>
+
+#include <sys/mman.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_map.h>
+
+#include <machine/cpu.h>
+#include <machine/reg.h>
+#include <machine/exec.h>
+
+#ifdef COMPAT_LINUX
+#include <compat/linux/linux_exec.h>
+#endif
+
+#ifdef COMPAT_SVR4
+#include <compat/svr4/svr4_exec.h>
+#endif
+
+#ifdef COMPAT_FREEBSD
+#include <compat/freebsd/freebsd_exec.h>
+#endif
+
+struct elf64_probe_entry {
+	int (*func) __P((struct proc *, struct exec_package *, char *,
+	    u_long *, u_int8_t *));
+	int os_mask;
+} elf64_probes[] = {
+#ifdef COMPAT_FREEBSD
+	{ freebsd_elf64_probe, 1 << OOS_FREEBSD },
+#endif
+#ifdef COMPAT_SVR4
+	{ svr4_elf64_probe,
+	    1 << OOS_SVR4 | 1 << OOS_ESIX | 1 << OOS_SOLARIS | 1 << OOS_SCO |
+	    1 << OOS_DELL | 1 << OOS_NCR },
+#endif
+#ifdef COMPAT_LINUX
+	{ linux_elf64_probe, 1 << OOS_LINUX },
+#endif
+	{ 0, 1 << OOS_OPENBSD }
+};
+
+int elf64_load_file __P((struct proc *, char *, struct exec_package *,
+    struct elf_args *, u_long *));
+
+int elf64_check_header __P((Elf64_Ehdr *, int));
+int olf64_check_header __P((Elf64_Ehdr *, int, u_int8_t *));
+int elf64_read_from __P((struct proc *, struct vnode *, u_long, caddr_t, int));
+void elf64_load_psection __P((struct exec_vmcmd_set *, struct vnode *,
+    Elf64_Phdr *, u_long *, u_long *, int *));
+
+int exec_elf64_fixup __P((struct proc *, struct exec_package *));
+
+/* round up and down to page boundaries. */
+#define ELF_ROUND(a, b)         (((a) + (b) - 1) & ~((b) - 1))
+#define ELF_TRUNC(a, b)         ((a) & ~((b) - 1))
+
+/*
+ * This is the basic elf emul. elf64_probe_funcs may change to other emuls.
+ */
+
+extern char sigcode[], esigcode[];
+#ifdef SYSCALL_DEBUG
+extern char *syscallnames[];
+#endif
+
+struct emul emul_elf64 = {
+	"native",
+	NULL,
+	sendsig,
+	SYS_syscall,
+	SYS_MAXSYSCALL,
+	sysent,
+#ifdef SYSCALL_DEBUG
+	syscallnames,
+#else
+	NULL,
+#endif
+	sizeof (AuxInfo) * ELF_AUX_ENTRIES,
+	elf64_copyargs,
+	setregs,
+	exec_elf64_fixup,
+	sigcode,
+	esigcode,
+};
+
+
+/*
+ * Copy arguments onto the stack in the normal way, but add some
+ * space for extra information in case of dynamic binding.
+ */
+void *
+elf64_copyargs(pack, arginfo, stack, argp)
+	struct exec_package *pack;
+	struct ps_strings *arginfo;
+	void *stack;
+	void *argp;
+{
+	stack = copyargs(pack, arginfo, stack, argp);
+	if (!stack)
+		return (NULL);
+
+	/*
+	 * Push space for extra arguments on the stack needed by
+	 * dynamically linked binaries
+	 */
+	if (pack->ep_interp != NULL) {
+		pack->ep_emul_argp = stack;
+		stack += ELF_AUX_ENTRIES * sizeof (AuxInfo);
+	}
+	return (stack);
+}
+
+/*
+ * elf64_check_header():
+ *
+ * Check header for validity; return 0 for ok, ENOEXEC if error
+ */
+int
+elf64_check_header(ehdr, type)
+	Elf64_Ehdr *ehdr;
+	int type;
+{
+        /*
+	 * We need to check magic, class size, endianess, and version before
+	 * we look at the rest of the Elf32_Ehdr structure. These few elements
+	 * are represented in a machine independant fashion.
+	 */
+	if (!IS_ELF(*ehdr) ||
+	    ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
+	    ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
+	    ehdr->e_ident[EI_VERSION] != ELF_TARG_VER)
+                return (ENOEXEC);
+        
+        /* Now check the machine dependant header */
+	if (ehdr->e_machine != ELF_TARG_MACH ||
+	    ehdr->e_version != ELF_TARG_VER)
+                return (ENOEXEC);
+
+        /* Check the type */
+	if (ehdr->e_type != type)
+		return (ENOEXEC);
+
+	return (0);
+}
+
+/*
+ * olf64_check_header():
+ *
+ * Check header for validity; return 0 for ok, ENOEXEC if error.
+ * Remeber OS tag for callers sake.
+ */
+int
+olf64_check_header(ehdr, type, os)
+	Elf64_Ehdr *ehdr;
+	int type;
+	u_int8_t *os;
+{
+	int i;
+
+        /*
+	 * We need to check magic, class size, endianess, version, and OS
+	 * before we look at the rest of the Elf32_Ehdr structure. These few
+	 * elements are represented in a machine independant fashion.
+	 */
+	if (!IS_OLF(*ehdr) ||
+	    ehdr->e_ident[OI_CLASS] != ELF_TARG_CLASS ||
+	    ehdr->e_ident[OI_DATA] != ELF_TARG_DATA ||
+	    ehdr->e_ident[OI_VERSION] != ELF_TARG_VER)
+                return (ENOEXEC);
+
+	for (i = 0; i < sizeof elf64_probes / sizeof elf64_probes[0]; i++)
+		if ((1 << ehdr->e_ident[OI_OS]) & elf64_probes[i].os_mask)
+                	goto os_ok;
+	return (ENOEXEC);
+
+os_ok:        
+        /* Now check the machine dependant header */
+	if (ehdr->e_machine != ELF_TARG_MACH ||
+	    ehdr->e_version != ELF_TARG_VER)
+                return (ENOEXEC);
+
+        /* Check the type */
+	if (ehdr->e_type != type)
+		return (ENOEXEC);
+
+	*os = ehdr->e_ident[OI_OS];
+	return (0);
+}
+
+/*
+ * elf64_load_psection():
+ * 
+ * Load a psection at the appropriate address
+ */
+void
+elf64_load_psection(vcset, vp, ph, addr, size, prot)
+	struct exec_vmcmd_set *vcset;
+	struct vnode *vp;
+	Elf64_Phdr *ph;
+	u_long *addr;
+	u_long *size;
+	int *prot;
+{
+	u_long uaddr, msize, psize, rm, rf;
+	long diff, offset;
+
+	/*
+	 * If the user specified an address, then we load there.
+	 */
+	if (*addr != ELF64_NO_ADDR) {
+		if (ph->p_align > 1) {
+			*addr = ELF_ROUND(*addr + ph->p_align, ph->p_align);
+			uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align);
+		} else
+			uaddr = ph->p_vaddr;
+		diff = ph->p_vaddr - uaddr;
+	} else {
+		*addr = uaddr = ph->p_vaddr;
+		if (ph->p_align > 1)
+			*addr = ELF_TRUNC(uaddr, ph->p_align);
+		diff = uaddr - *addr;
+	}
+
+	*prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0;
+	*prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0;
+	*prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0;
+
+	offset = ph->p_offset - diff;
+	*size = ph->p_filesz + diff;
+	msize = ph->p_memsz + diff;
+	psize = round_page(*size);
+
+	/*
+	 * Because the pagedvn pager can't handle zero fill of the last
+	 * data page if it's not page aligned we map the las page readvn.
+	 */
+	if(ph->p_flags & PF_W) {
+		psize = trunc_page(*size);
+		NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp,
+		    offset, *prot);
+		if(psize != *size) {
+			NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize,
+			    *addr + psize, vp, offset + psize, *prot);
+		}
+	}
+	else {
+		 NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset,
+		     *prot);
+	}
+
+	/*
+	 * Check if we need to extend the size of the segment
+	 */
+	rm = round_page(*addr + msize);
+	rf = round_page(*addr + *size);
+
+	if (rm != rf) {
+		NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0,
+		    *prot);
+		*size = msize;
+	}
+}
+
+/*
+ * elf64_read_from():
+ *
+ *	Read from vnode into buffer at offset.
+ */
+int
+elf64_read_from(p, vp, off, buf, size)
+	struct proc *p;
+	struct vnode *vp;
+	u_long off;
+	caddr_t buf;
+	int size;
+{
+	int error;
+	size_t resid;
+
+	if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE,
+	    IO_NODELOCKED, p->p_ucred, &resid, p)) != 0)
+		return error;
+	/*
+	 * See if we got all of it
+	 */
+	if (resid != 0)
+		return (ENOEXEC);
+	return (0);
+}
+
+/*
+ * elf64_load_file():
+ *
+ * Load a file (interpreter/library) pointed to by path [stolen from
+ * coff_load_shlib()]. Made slightly generic so it might be used externally.
+ */
+int
+elf64_load_file(p, path, epp, ap, last)
+	struct proc *p;
+	char *path;
+	struct exec_package *epp;
+	struct elf_args	*ap;
+	u_long *last;
+{
+	int error, i;
+	struct nameidata nd;
+	Elf64_Ehdr eh;
+	Elf64_Phdr *ph = NULL;
+	u_long phsize;
+	char *bp = NULL;
+	u_long addr = *last;
+	struct vnode *vp;
+	u_int8_t os;			/* Just a dummy in this routine */
+
+	bp = path;
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p);
+	if ((error = namei(&nd)) != 0) {
+		return (error);
+	}
+	vp = nd.ni_vp;
+	if (vp->v_type != VREG) {
+		error = EACCES;
+		goto bad;
+	}
+	if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0)
+		goto bad;
+	if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
+		error = EACCES;
+		goto bad;
+	}
+	if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0)
+		goto bad1;
+	if ((error = elf64_read_from(p, nd.ni_vp, 0,
+				    (caddr_t)&eh, sizeof(eh))) != 0)
+		goto bad1;
+
+	if (elf64_check_header(&eh, ET_DYN) &&
+	    olf64_check_header(&eh, ET_DYN, &os)) {
+		error = ENOEXEC;
+		goto bad1;
+	}
+
+	phsize = eh.e_phnum * sizeof(Elf64_Phdr);
+	ph = (Elf64_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
+
+	if ((error = elf64_read_from(p, nd.ni_vp, eh.e_phoff, (caddr_t)ph,
+	    phsize)) != 0)
+		goto bad1;
+
+	/*
+	 * Load all the necessary sections
+	 */
+	for (i = 0; i < eh.e_phnum; i++) {
+		u_long size = 0;
+		int prot = 0;
+#if defined(__mips__)
+		if (*last == ELF32_NO_ADDR)
+			addr = ELF32_NO_ADDR;	/* GRRRRR!!!!! */
+#endif
+
+		switch (ph[i].p_type) {
+		case PT_LOAD:
+			elf64_load_psection(&epp->ep_vmcmds, nd.ni_vp, &ph[i],
+						&addr, &size, &prot);
+			/* If entry is within this section it must be text */
+			if (eh.e_entry >= ph[i].p_vaddr &&
+			    eh.e_entry < (ph[i].p_vaddr + size)) {
+ 				epp->ep_entry = addr + eh.e_entry -
+                                        ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align);
+				ap->arg_interp = addr;
+			}
+			addr += size;
+			break;
+
+		case PT_DYNAMIC:
+		case PT_PHDR:
+		case PT_NOTE:
+			break;
+
+		default:
+			break;
+		}
+	}
+
+bad1:
+	VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p);
+bad:
+	if (ph != NULL)
+		free((char *)ph, M_TEMP);
+
+	*last = addr;
+	vput(nd.ni_vp);
+	return (error);
+}
+
+/*
+ * exec_elf64_makecmds(): Prepare an Elf binary's exec package
+ *
+ * First, set of the various offsets/lengths in the exec package.
+ *
+ * Then, mark the text image busy (so it can be demand paged) or error out if
+ * this is not possible.  Finally, set up vmcmds for the text, data, bss, and
+ * stack segments.
+ */
+int
+exec_elf64_makecmds(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	Elf64_Ehdr *eh = epp->ep_hdr;
+	Elf64_Phdr *ph, *pp;
+	Elf64_Addr phdr = 0;
+	int error, i, nload;
+	char interp[MAXPATHLEN];
+	u_long pos = 0, phsize;
+	u_int8_t os = OOS_NULL;
+
+	if (epp->ep_hdrvalid < sizeof(Elf64_Ehdr))
+		return (ENOEXEC);
+
+	if (elf64_check_header(eh, ET_EXEC) &&
+	    olf64_check_header(eh, ET_EXEC, &os))
+		return (ENOEXEC);
+
+	/*
+	 * 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 (epp->ep_vp->v_writecount != 0) {
+#ifdef DIAGNOSTIC
+		if (epp->ep_vp->v_flag & VTEXT)
+			panic("exec: a VTEXT vnode has writecount != 0");
+#endif
+		return (ETXTBSY);
+	}
+	/*
+	 * Allocate space to hold all the program headers, and read them
+	 * from the file
+	 */
+	phsize = eh->e_phnum * sizeof(Elf64_Phdr);
+	ph = (Elf64_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
+
+	if ((error = elf64_read_from(p, epp->ep_vp, eh->e_phoff, (caddr_t)ph,
+	    phsize)) != 0)
+		goto bad;
+
+	epp->ep_tsize = ELF64_NO_ADDR;
+	epp->ep_dsize = ELF64_NO_ADDR;
+
+	interp[0] = '\0';
+
+	for (i = 0; i < eh->e_phnum; i++) {
+		pp = &ph[i];
+		if (pp->p_type == PT_INTERP) {
+			if (pp->p_filesz >= sizeof(interp))
+				goto bad;
+			if ((error = elf64_read_from(p, epp->ep_vp,
+			     pp->p_offset, (caddr_t)interp,
+			     pp->p_filesz)) != 0)
+				goto bad;
+			break;
+		}
+	}
+
+	/*
+	 * OK, we want a slightly different twist of the
+	 * standard emulation package for "real" elf.
+	 */
+	epp->ep_emul = &emul_elf64;
+	pos = ELF64_NO_ADDR;
+
+	/*
+	 * On the same architecture, we may be emulating different systems.
+	 * See which one will accept this executable. This currently only
+	 * applies to Linux and SVR4 on the i386 and the Alpha.
+	 *
+	 * Probe functions would normally see if the interpreter (if any)
+	 * exists. Emulation packages may possibly replace the interpreter in
+	 * interp[] with a changed path (/emul/xxx/<path>), and also
+	 * set the ep_emul field in the exec package structure.
+	 */
+	error = ENOEXEC;
+	p->p_os = OOS_OPENBSD;
+	for (i = 0; i < sizeof elf64_probes / sizeof elf64_probes[0] && error;
+	     i++)
+		if (os == OOS_NULL || ((1 << os) & elf64_probes[i].os_mask))
+			error = elf64_probes[i].func ?
+			    (*elf64_probes[i].func)(p, epp, interp, &pos, &os) :
+			    0;
+	if (!error)
+		p->p_os = os;
+#ifndef NATIVE_ELF
+	else
+		goto bad;
+#endif /* NATIVE_ELF */
+
+	/*
+	 * Load all the necessary sections
+	 */
+	for (i = nload = 0; i < eh->e_phnum; i++) {
+		u_int64_t addr = ELF64_NO_ADDR, size = 0;
+		int prot = 0;
+
+		pp = &ph[i];
+
+		switch (ph[i].p_type) {
+		case PT_LOAD:
+			/*
+			 * XXX
+			 * Can handle only 2 sections: text and data
+			 */
+			if (nload++ == 2)
+				goto bad;
+			elf64_load_psection(&epp->ep_vmcmds, epp->ep_vp, &ph[i],
+			    &addr, &size, &prot);
+			/*
+			 * Decide whether it's text or data by looking
+			 * at the entry point.
+			 */
+			if (eh->e_entry >= addr &&
+			    eh->e_entry < (addr + size)) {
+				epp->ep_taddr = addr;
+				epp->ep_tsize = size;
+				if (epp->ep_daddr == ELF64_NO_ADDR) {
+                                        epp->ep_daddr = addr;
+                                        epp->ep_dsize = size;
+                                }
+			} else {
+				epp->ep_daddr = addr;
+				epp->ep_dsize = size;
+			}
+			break;
+
+		case PT_SHLIB:
+			error = ENOEXEC;
+			goto bad;
+
+		case PT_INTERP:
+			/* Already did this one */
+		case PT_DYNAMIC:
+		case PT_NOTE:
+			break;
+
+		case PT_PHDR:
+			/* Note address of program headers (in text segment) */
+			phdr = pp->p_vaddr;
+			break;
+
+		default:
+			/*
+			 * Not fatal, we don't need to understand everything
+			 * :-)
+			 */
+			break;
+		}
+	}
+
+#if !defined(__mips__)
+	/*
+	 * If no position to load the interpreter was set by a probe
+	 * function, pick the same address that a non-fixed mmap(0, ..)
+	 * would (i.e. something safely out of the way).
+	 */
+	if (pos == ELF64_NO_ADDR)
+		pos = round_page(epp->ep_daddr + MAXDSIZ);
+#endif
+
+	/*
+	 * Check if we found a dynamically linked binary and arrange to load
+	 * it's interpreter when the exec file is released.
+	 */
+	if (interp[0]) {
+		char *ip;
+		struct elf_args *ap;
+
+		ip = (char *)malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
+		ap = (struct elf_args *)
+		    malloc(sizeof(struct elf_args), M_TEMP, M_WAITOK);
+
+		bcopy(interp, ip, MAXPATHLEN);
+		epp->ep_interp = ip;
+		epp->ep_interp_pos = pos;
+
+		ap->arg_phaddr = phdr;
+		ap->arg_phentsize = eh->e_phentsize;
+		ap->arg_phnum = eh->e_phnum;
+		ap->arg_entry = eh->e_entry;
+		ap->arg_os = os;
+
+		epp->ep_emul_arg = ap;
+		epp->ep_entry = eh->e_entry; /* keep check_exec() happy */
+	}
+	else {
+		epp->ep_interp = NULL;
+		epp->ep_entry = eh->e_entry;
+	}
+
+#if defined(COMPAT_SVR4) && defined(i386)
+#ifndef ELF_MAP_PAGE_ZERO
+	/* Dell SVR4 maps page zero, yeuch! */
+	if (p->p_os == OOS_DELL)
+#endif
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, NBPG, 0,
+		    epp->ep_vp, 0, VM_PROT_READ);
+#endif
+
+	free((char *)ph, M_TEMP);
+	epp->ep_vp->v_flag |= VTEXT;
+	return (exec_setup_stack(p, epp));
+
+bad:
+	free((char *)ph, M_TEMP);
+	kill_vmcmds(&epp->ep_vmcmds);
+	return (ENOEXEC);
+}
+
+/*
+ * Phase II of load. It is now safe to load the interpreter. Info collected
+ * when loading the program is available for setup of the interpreter.
+ */
+int
+exec_elf64_fixup(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	char	*interp;
+	int	error, i;
+	struct	elf_args *ap;
+	AuxInfo ai[ELF_AUX_ENTRIES], *a;
+	u_long	pos = epp->ep_interp_pos;
+
+	if(epp->ep_interp == 0) {
+		return (0);
+	}
+
+	interp = (char *)epp->ep_interp;
+	ap = (struct elf_args *)epp->ep_emul_arg;
+
+	if ((error = elf64_load_file(p, interp, epp, ap, &pos)) != 0) {
+		free((char *)ap, M_TEMP);
+		free((char *)interp, M_TEMP);
+		kill_vmcmds(&epp->ep_vmcmds);
+		return (error);
+	}
+	/*
+	 * We have to do this ourselfs...
+	 */
+	for (i = 0; i < epp->ep_vmcmds.evs_used && !error; i++) {
+		struct exec_vmcmd *vcp;
+
+		vcp = &epp->ep_vmcmds.evs_cmds[i];
+		error = (*vcp->ev_proc)(p, vcp);
+	}
+	kill_vmcmds(&epp->ep_vmcmds);
+
+	/*
+	 * Push extra arguments on the stack needed by dynamically
+	 * linked binaries
+	 */
+	if(error == 0) {
+		a = ai;
+
+		a->au_id = AUX_phdr;
+		a->au_v = ap->arg_phaddr;
+		a++;
+
+		a->au_id = AUX_phent;
+		a->au_v = ap->arg_phentsize;
+		a++;
+
+		a->au_id = AUX_phnum;
+		a->au_v = ap->arg_phnum;
+		a++;
+
+		a->au_id = AUX_pagesz;
+		a->au_v = NBPG;
+		a++;
+
+		a->au_id = AUX_base;
+		a->au_v = ap->arg_interp;
+		a++;
+
+		a->au_id = AUX_flags;
+		a->au_v = 0;
+		a++;
+
+		a->au_id = AUX_entry;
+		a->au_v = ap->arg_entry;
+		a++;
+
+		a->au_id = AUX_null;
+		a->au_v = 0;
+		a++;
+
+		error = copyout(ai, epp->ep_emul_argp, sizeof ai);
+	}
+	free((char *)ap, M_TEMP);
+	free((char *)interp, M_TEMP);
+	return (error);
+}
+
+char *
+elf64_check_brand(eh)
+	Elf64_Ehdr *eh;
+{
+	if (eh->e_ident[EI_BRAND] == '\0')
+		return (NULL);
+	return (&eh->e_ident[EI_BRAND]);
+}
+
+#endif /* _KERN_DO_ELF64 */