195 lines
6.0 KiB
C
195 lines
6.0 KiB
C
/* $NetBSD: vax1k_exec.c,v 1.6 2001/11/13 02:09:35 lukem Exp $ */
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/*
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* Copyright (c) 1993, 1994 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Exec glue to provide compatibility with older NetBSD vax1k exectuables.
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*
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* Because NetBSD/vax now uses 4k page size, older binaries (that started
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* on an 1k boundary) cannot be mmap'ed. Therefore they are read in
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* (via vn_rdwr) as OMAGIC binaries and executed. This will use a little
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* bit more memory, but otherwise won't affect the execution speed.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vax1k_exec.c,v 1.6 2001/11/13 02:09:35 lukem Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#include <sys/resourcevar.h>
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#include <compat/vax1k/vax1k_exec.h>
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#if defined(_KERNEL_OPT)
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#include "opt_compat_43.h"
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#else
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#define COMPAT_43 /* enable 4.3BSD binaries for lkm */
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#endif
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int exec_vax1k_prep_anymagic __P((struct proc *p, struct exec_package *epp,
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int, int));
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/*
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* exec_vax1k_makecmds(): Check if it's an a.out-format executable
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* with an vax1k magic number.
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*
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* Given a proc pointer and an exec package pointer, see if the referent
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* of the epp is in a.out format. Just check 'standard' magic numbers for
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* this architecture.
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*
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* This function, in the former case, or the hook, in the latter, is
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* responsible for creating a set of vmcmds which can be used to build
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* the process's vm space and inserting them into the exec package.
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*/
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int
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exec_vax1k_makecmds(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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u_long midmag, magic;
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u_short mid;
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int error;
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struct exec *execp = epp->ep_hdr;
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if (epp->ep_hdrvalid < sizeof(struct exec))
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return ENOEXEC;
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midmag = ntohl(execp->a_midmag);
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mid = (midmag >> 16) & 0x3ff;
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magic = midmag & 0xffff;
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midmag = mid << 16 | magic;
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switch (midmag) {
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case (MID_VAX1K << 16) | ZMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp, 0, 0);
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goto done;
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case (MID_VAX1K << 16) | NMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp,
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sizeof(struct exec), 1);
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goto done;
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case (MID_VAX1K << 16) | OMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp,
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sizeof(struct exec), 0);
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goto done;
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}
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#ifdef COMPAT_43
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/*
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* 4.3BSD pre-dates cpu midmag (e.g. MID_VAX1K). instead, we
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* expect a magic number in native byte order.
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*/
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switch (execp->a_midmag) {
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case ZMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp, VAX1K_LDPGSZ, 0);
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goto done;
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case NMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp,
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sizeof(struct exec), 1);
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goto done;
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case OMAGIC:
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error = exec_vax1k_prep_anymagic(p, epp,
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sizeof(struct exec), 0);
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goto done;
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}
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#endif
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/* failed... */
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error = ENOEXEC;
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done:
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if (error)
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kill_vmcmds(&epp->ep_vmcmds);
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return error;
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}
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/*
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* exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package
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*
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* First, set of the various offsets/lengths in the exec package.
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* Note that all code is mapped RW; no protection, but because it is
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* only used for compatibility it won't hurt.
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*
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*/
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int
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exec_vax1k_prep_anymagic(p, epp, text_foffset, textpad)
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struct proc *p;
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struct exec_package *epp;
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int text_foffset, textpad;
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{
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struct exec *execp = epp->ep_hdr;
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epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1);
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = epp->ep_taddr + epp->ep_tsize;
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if (textpad) /* pad for NMAGIC? */
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epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) &
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~(VAX1K_LDPGSZ - 1);
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epp->ep_dsize = execp->a_data;
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epp->ep_entry = execp->a_entry;
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/* first allocate memory for text+data+bss */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
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round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) -
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trunc_page(epp->ep_taddr), /* size */
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trunc_page(epp->ep_taddr), NULLVP, /* addr, vnode */
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0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* then read the text in the area we just allocated */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
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epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset,
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VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
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/* next read the data */
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if (epp->ep_dsize) {
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
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epp->ep_dsize, epp->ep_daddr, epp->ep_vp,
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text_foffset + epp->ep_tsize,
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VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
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}
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/* now bump up the dsize to include the bss so that sbrk works */
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epp->ep_dsize += execp->a_bss;
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/* finally, setup the stack ... */
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return exec_aout_setup_stack(p, epp);
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}
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