214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
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/*
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* Copyright (c) 1993 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 withough 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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* $Id: exec_aout.c,v 1.1 1993/09/05 01:33:35 cgd Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "filedesc.h"
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#include "kernel.h"
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#include "proc.h"
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#include "mount.h"
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#include "malloc.h"
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#include "namei.h"
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#include "vnode.h"
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#include "file.h"
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#include "exec.h"
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#include "resourcevar.h"
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#include "wait.h"
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#include "machine/cpu.h"
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#include "machine/reg.h"
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#include "machine/exec.h"
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#include "mman.h"
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#include "vm/vm.h"
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#include "vm/vm_param.h"
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#include "vm/vm_map.h"
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#include "vm/vm_kern.h"
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#include "vm/vm_pager.h"
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/*
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* exec_aout_makecmds(): Check if it's an a.out-format 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 a.out format. First check 'standard' magic numbers for
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* this architecture. If that fails, try a cpu-dependent hook.
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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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* XXX: NMAGIC and OMAGIC are currently not supported.
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*/
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int
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exec_aout_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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midmag = ntohl(epp->ep_execp->a_midmag);
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mid = (midmag >> 16) & 0x3ff;
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magic = midmag & 0xffff;
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#ifdef EXEC_DEBUG
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printf("exec_makecmds: a_midmag is %x, magic=%x mid=%x\n",
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epp->ep_execp->a_midmag, magic, mid);
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#endif
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midmag = mid << 16 | magic;
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switch (midmag) {
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case (MID_MACHINE << 16) | ZMAGIC:
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error = exec_aout_prep_zmagic(p, epp);
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break;
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case (MID_MACHINE << 16) | OMAGIC:
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case (MID_MACHINE << 16) | NMAGIC:
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default:
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error = cpu_exec_aout_makecmds(p, epp);
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}
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if (error && epp->ep_vcp)
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kill_vmcmd(&epp->ep_vcp);
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bad:
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#ifdef EXEC_DEBUG
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printf("exec_makecmds returning with error = %d\n", error);
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#endif
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return error;
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}
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/*
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* exec_aout_prep_zmagic(): Prepare a 'native' 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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* 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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* 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_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 exec *execp = epp->ep_execp;
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struct exec_vmcmd *ccmdp;
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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_maxsaddr = USRSTACK - MAXSSIZ;
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epp->ep_minsaddr = USRSTACK;
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epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur;
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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_flag & VTEXT) == 0 && 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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epp->ep_vcp = NULL;
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return ETXTBSY;
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}
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epp->ep_vp->v_flag |= VTEXT;
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/* set up command for text segment */
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epp->ep_vcp = new_vmcmd(vmcmd_map_pagedvn,
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execp->a_text,
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epp->ep_taddr,
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epp->ep_vp,
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0,
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VM_PROT_READ | VM_PROT_EXECUTE);
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ccmdp = epp->ep_vcp;
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/* set up command for data segment */
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ccmdp->ev_next = new_vmcmd(vmcmd_map_pagedvn,
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execp->a_data,
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epp->ep_daddr,
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epp->ep_vp,
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execp->a_text,
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VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
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ccmdp = ccmdp->ev_next;
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/* set up command for bss segment */
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ccmdp->ev_next = new_vmcmd(vmcmd_map_zero,
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execp->a_bss,
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epp->ep_daddr + execp->a_data,
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0,
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0,
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VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
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ccmdp = ccmdp->ev_next;
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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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ccmdp->ev_next = new_vmcmd(vmcmd_map_zero,
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((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr),
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epp->ep_maxsaddr,
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0,
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0,
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VM_PROT_NONE);
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ccmdp = ccmdp->ev_next;
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ccmdp->ev_next = new_vmcmd(vmcmd_map_zero,
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epp->ep_ssize,
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(epp->ep_minsaddr - epp->ep_ssize),
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0,
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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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