302 lines
9.7 KiB
C
302 lines
9.7 KiB
C
/* $NetBSD: netbsd32_exec_aout.c,v 1.2 2000/12/18 14:50:04 mrg Exp $ */
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/* from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
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/*
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* Copyright (c) 1998 Matthew R. Green.
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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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#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 <sys/signal.h>
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#include <sys/signalvar.h>
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#include <compat/netbsd32/netbsd32.h>
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#ifndef EXEC_AOUT
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#define EXEC_AOUT
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#endif
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#include <compat/netbsd32/netbsd32_exec.h>
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#include <machine/frame.h>
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#include <machine/netbsd32_machdep.h>
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int netbsd32_copyinargs __P((struct exec_package *, struct ps_strings *,
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void *, size_t, const void *, const void *));
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static int netbsd32_exec_aout_prep_zmagic __P((struct proc *,
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struct exec_package *));
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static int netbsd32_exec_aout_prep_nmagic __P((struct proc *,
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struct exec_package *));
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static int netbsd32_exec_aout_prep_omagic __P((struct proc *,
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struct exec_package *));
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int netbsd32_exec_aout_setup_stack __P((struct proc *p,
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struct exec_package *epp));
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/*
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* exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format
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* executable.
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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 netbsd32 a.out format. Check 'standard' magic
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* numbers for 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_netbsd32_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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netbsd32_u_long midmag, magic;
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u_short mid;
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int error;
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struct netbsd32_exec *execp = epp->ep_hdr;
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if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec))
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return ENOEXEC;
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midmag = (netbsd32_u_long)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_SPARC << 16) | ZMAGIC:
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error = netbsd32_exec_aout_prep_zmagic(p, epp);
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break;
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case (MID_SPARC << 16) | NMAGIC:
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error = netbsd32_exec_aout_prep_nmagic(p, epp);
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break;
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case (MID_SPARC << 16) | OMAGIC:
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error = netbsd32_exec_aout_prep_omagic(p, epp);
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break;
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default:
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/* Invalid magic */
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error = ENOEXEC;
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break;
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}
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if (error == 0) {
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/* set up our emulation information */
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epp->ep_flags |= EXEC_32;
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} else
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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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* netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's
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* 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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netbsd32_exec_aout_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 netbsd32_exec *execp = epp->ep_hdr;
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epp->ep_taddr = 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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/*
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* check if vnode is in open for writing, because we want to
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* demand-page out of it. if it is, don't do it, for various
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* reasons
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*/
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if ((execp->a_text != 0 || execp->a_data != 0) &&
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epp->ep_vp->v_writecount != 0) {
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#ifdef DIAGNOSTIC
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if (epp->ep_vp->v_flag & VTEXT)
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panic("exec: a VTEXT vnode has writecount != 0\n");
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#endif
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return ETXTBSY;
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}
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vn_marktext(epp->ep_vp);
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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 netbsd32_exec_aout_setup_stack(p, epp);
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}
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/*
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* netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's
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* exec package
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*/
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int
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netbsd32_exec_aout_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 netbsd32_exec *execp = epp->ep_hdr;
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long bsize, baddr;
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epp->ep_taddr = 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, __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 netbsd32_exec_aout_setup_stack(p, epp);
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}
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/*
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* netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's
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* exec package
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*/
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int
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netbsd32_exec_aout_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 netbsd32_exec *execp = epp->ep_hdr;
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long dsize, bsize, baddr;
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epp->ep_taddr = 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 netbsd32_exec_aout_setup_stack(p, epp);
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}
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/*
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* netbsd32_exec_aout_setup_stack(): Set up the stack segment for an a.out
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* executable.
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*
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* Note that the ep_ssize parameter must be set to be the current stack
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* limit; this is adjusted in the body of execve() to yield the
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* appropriate stack segment usage once the argument length is
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* calculated.
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*
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* This function returns an int for uniformity with other (future) formats'
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* stack setup functions. They might have errors to return.
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*/
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int
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netbsd32_exec_aout_setup_stack(struct proc *p, struct exec_package *epp)
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{
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epp->ep_maxsaddr = USRSTACK32 - MAXSSIZ;
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epp->ep_minsaddr = USRSTACK32;
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epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur;
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/*
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* set up commands for stack. note that this takes *two*, one to
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* map the part of the stack which we can access, and one to map
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* the part which we can't.
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*
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* arguably, it could be made into one, but that would require the
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* addition of another mapping proc, which is unnecessary
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*
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* note that in memory, things assumed to be: 0 ... ep_maxsaddr
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* <stack> ep_minsaddr
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*/
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
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((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
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epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE);
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NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize,
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(epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0,
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VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
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return 0;
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}
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