NetBSD-5.0.2/sys/compat/vax1k/vax1k_exec.c
/* $NetBSD: vax1k_exec.c,v 1.15 2008/02/13 17:41:09 matt 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vax1k_exec.c,v 1.15 2008/02/13 17:41:09 matt Exp $");
#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>
#if defined(_KERNEL_OPT)
#include "opt_compat_43.h"
#else
#define COMPAT_43 /* enable 4.3BSD binaries for lkm */
#endif
int exec_vax1k_prep_anymagic(struct lwp *, struct exec_package *,
size_t, bool);
/*
* 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(struct lwp *l, 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(l, epp, 0, false);
goto done;
case (MID_VAX1K << 16) | NMAGIC:
error = exec_vax1k_prep_anymagic(l, epp,
sizeof(struct exec), true);
goto done;
case (MID_VAX1K << 16) | OMAGIC:
error = exec_vax1k_prep_anymagic(l, epp,
sizeof(struct exec), false);
goto done;
}
#ifdef COMPAT_43
/*
* 4.3BSD pre-dates CPU midmag (e.g. MID_VAX1K). instead, we
* expect a magic number in native byte order.
*/
switch (execp->a_midmag) {
case ZMAGIC:
error = exec_vax1k_prep_anymagic(l, epp, VAX1K_LDPGSZ, false);
goto done;
case NMAGIC:
error = exec_vax1k_prep_anymagic(l, epp,
sizeof(struct exec), true);
goto done;
case OMAGIC:
error = exec_vax1k_prep_anymagic(l, epp,
sizeof(struct exec), false);
goto done;
}
#endif
/* failed... */
error = ENOEXEC;
done:
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(struct lwp *l, struct exec_package *epp,
size_t text_foffset, bool textpad)
{
struct exec *execp = epp->ep_hdr;
epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1);
epp->ep_tsize = execp->a_text;
epp->ep_daddr = epp->ep_taddr + epp->ep_tsize;
if (textpad) /* pad for NMAGIC? */
epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) &
~(VAX1K_LDPGSZ - 1);
epp->ep_dsize = execp->a_data;
epp->ep_entry = execp->a_entry;
/* first allocate memory for text+data+bss */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) -
trunc_page(epp->ep_taddr), /* size */
trunc_page(epp->ep_taddr), NULLVP, /* addr, vnode */
0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
/* then read the text in the area we just allocated */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset,
VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
/* next read the data */
if (epp->ep_dsize) {
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
epp->ep_dsize, epp->ep_daddr, epp->ep_vp,
text_foffset + epp->ep_tsize,
VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
}
/* now bump up the dsize to include the bss so that sbrk works */
epp->ep_dsize += execp->a_bss;
/* finally, setup the stack ... */
return (*epp->ep_esch->es_setup_stack)(l, epp);
}