246 lines
7.7 KiB
C
246 lines
7.7 KiB
C
/* $NetBSD: m68k4k_exec.c,v 1.10 2002/10/05 22:34:04 chs 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 m68k4k exectuables.
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*
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* Taken directly from kern/exec_aout.c and frobbed to map text and
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* data as m68k4k executables expect.
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*
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* This module only works on machines with NBPG == 4096. It's not clear
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* that making it work on other machines is worth the trouble.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: m68k4k_exec.c,v 1.10 2002/10/05 22:34:04 chs Exp $");
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#if !defined(__m68k__)
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#error YOU GOTTA BE KIDDING!
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#endif
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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/m68k4k/m68k4k_exec.h>
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int exec_m68k4k_prep_zmagic __P((struct proc *, struct exec_package *));
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int exec_m68k4k_prep_nmagic __P((struct proc *, struct exec_package *));
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int exec_m68k4k_prep_omagic __P((struct proc *, struct exec_package *));
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/*
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* exec_m68k4k_makecmds(): Check if it's an a.out-format executable
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* with an m68k4k 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_m68k4k_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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/* See note above... */
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if (M68K4K_LDPGSZ != NBPG)
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return ENOEXEC;
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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_M68K4K << 16) | ZMAGIC:
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error = exec_m68k4k_prep_zmagic(p, epp);
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break;
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case (MID_M68K4K << 16) | NMAGIC:
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error = exec_m68k4k_prep_nmagic(p, epp);
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break;
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case (MID_M68K4K << 16) | OMAGIC:
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error = exec_m68k4k_prep_omagic(p, epp);
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break;
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default:
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error = ENOEXEC;
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}
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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_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC 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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*
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* Then, mark the text image busy (so it can be demand paged) or error
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* out if this is not possible. Finally, set up vmcmds for the
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* text, data, bss, and stack segments.
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*/
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int
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exec_m68k4k_prep_zmagic(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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struct exec *execp = epp->ep_hdr;
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int error;
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epp->ep_taddr = M68K4K_USRTEXT;
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = epp->ep_taddr + execp->a_text;
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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error = vn_marktext(epp->ep_vp);
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if (error)
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return (error);
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
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epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
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epp->ep_daddr, epp->ep_vp, execp->a_text,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
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epp->ep_daddr + execp->a_data, NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return exec_aout_setup_stack(p, epp);
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}
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/*
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* exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package
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*/
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int
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exec_m68k4k_prep_nmagic(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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struct exec *execp = epp->ep_hdr;
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long bsize, baddr;
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epp->ep_taddr = M68K4K_USRTEXT;
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text,
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M68K4K_LDPGSZ);
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/* set up command for text segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
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epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
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VM_PROT_READ|VM_PROT_EXECUTE);
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/* set up command for data segment */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
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epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
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bsize = epp->ep_daddr + epp->ep_dsize - baddr;
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if (bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
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NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return exec_aout_setup_stack(p, epp);
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}
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/*
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* exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package
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*/
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int
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exec_m68k4k_prep_omagic(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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struct exec *execp = epp->ep_hdr;
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long dsize, bsize, baddr;
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epp->ep_taddr = M68K4K_USRTEXT;
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epp->ep_tsize = execp->a_text;
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epp->ep_daddr = epp->ep_taddr + execp->a_text;
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epp->ep_dsize = execp->a_data + execp->a_bss;
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epp->ep_entry = execp->a_entry;
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/* set up command for text and data segments */
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
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execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
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sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/* set up command for bss segment */
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baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
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bsize = epp->ep_daddr + epp->ep_dsize - baddr;
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if (bsize > 0)
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
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NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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/*
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* Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
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* obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
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* computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
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* respectively to page boundaries.
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* Compensate `ep_dsize' for the amount of data covered by the last
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* text page.
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*/
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dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
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epp->ep_dsize = (dsize > 0) ? dsize : 0;
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return exec_aout_setup_stack(p, epp);
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}
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