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compat_exec.c revision 1.4 
      1 /*	$NetBSD: compat_exec.c,v 1.4 2001/10/30 15:32:01 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993, 1994 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christopher G. Demetriou.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/param.h>
     34 #include <sys/systm.h>
     35 #include <sys/proc.h>
     36 #include <sys/malloc.h>
     37 #include <sys/vnode.h>
     38 #include <sys/exec.h>
     39 #include <sys/resourcevar.h>
     40 
     41 /*
     42  * exec_aout_prep_oldzmagic():
     43  *	Prepare the vmcmds to build a vmspace for an old ZMAGIC
     44  *	binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
     45  *
     46  * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
     47  * description of operation is there.
     48  * There were copies of this in the mac68k, hp300, and i386 ports.
     49  */
     50 int
     51 exec_aout_prep_oldzmagic(p, epp)
     52 	struct proc *p;
     53 	struct exec_package *epp;
     54 {
     55 	struct exec *execp = epp->ep_hdr;
     56 
     57 	epp->ep_taddr = 0;
     58 	epp->ep_tsize = execp->a_text;
     59 	epp->ep_daddr = epp->ep_taddr + execp->a_text;
     60 	epp->ep_dsize = execp->a_data + execp->a_bss;
     61 	epp->ep_entry = execp->a_entry;
     62 
     63 	/*
     64 	 * check if vnode is in open for writing, because we want to
     65 	 * demand-page out of it.  if it is, don't do it, for various
     66 	 * reasons
     67 	 */
     68 	if ((execp->a_text != 0 || execp->a_data != 0) &&
     69 	    epp->ep_vp->v_writecount != 0) {
     70 #ifdef DIAGNOSTIC
     71 		if (epp->ep_vp->v_flag & VTEXT)
     72 			panic("exec: a VTEXT vnode has writecount != 0\n");
     73 #endif
     74 		return ETXTBSY;
     75 	}
     76 	epp->ep_vp->v_flag |= VTEXT;
     77 
     78 	/* set up command for text segment */
     79 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
     80 	    epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */
     81 	    VM_PROT_READ|VM_PROT_EXECUTE);
     82 
     83 	/* set up command for data segment */
     84 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
     85 	    epp->ep_daddr, epp->ep_vp,
     86 	    execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */
     87 	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
     88 
     89 	/* set up command for bss segment */
     90 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
     91 	    epp->ep_daddr + execp->a_data, NULLVP, 0,
     92 	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
     93 
     94 	return exec_aout_setup_stack(p, epp);
     95 }
     96 
     97 
     98 /*
     99  * exec_aout_prep_oldnmagic():
    100  *	Prepare the vmcmds to build a vmspace for an old NMAGIC
    101  *	binary. [BSDI]
    102  *
    103  * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
    104  * at 0.
    105  * XXX: There must be a better way to share this code.
    106  */
    107 int
    108 exec_aout_prep_oldnmagic(p, epp)
    109 	struct proc *p;
    110 	struct exec_package *epp;
    111 {
    112 	struct exec *execp = epp->ep_hdr;
    113 	long bsize, baddr;
    114 
    115 	epp->ep_taddr = 0;
    116 	epp->ep_tsize = execp->a_text;
    117 	epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ);
    118 	epp->ep_dsize = execp->a_data + execp->a_bss;
    119 	epp->ep_entry = execp->a_entry;
    120 
    121 	/* set up command for text segment */
    122 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
    123 	    epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
    124 	    VM_PROT_READ|VM_PROT_EXECUTE);
    125 
    126 	/* set up command for data segment */
    127 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
    128 	    epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
    129 	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    130 
    131 	/* set up command for bss segment */
    132 	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
    133 	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
    134 	if (bsize > 0)
    135 		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
    136 		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    137 
    138 	return exec_aout_setup_stack(p, epp);
    139 }
    140 
    141 
    142 /*
    143  * exec_aout_prep_oldomagic():
    144  *	Prepare the vmcmds to build a vmspace for an old OMAGIC
    145  *	binary. [BSDI]
    146  *
    147  * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
    148  * at 0.
    149  * XXX: There must be a better way to share this code.
    150  */
    151 int
    152 exec_aout_prep_oldomagic(p, epp)
    153 	struct proc *p;
    154 	struct exec_package *epp;
    155 {
    156 	struct exec *execp = epp->ep_hdr;
    157 	long dsize, bsize, baddr;
    158 
    159 	epp->ep_taddr = 0;
    160 	epp->ep_tsize = execp->a_text;
    161 	epp->ep_daddr = epp->ep_taddr + execp->a_text;
    162 	epp->ep_dsize = execp->a_data + execp->a_bss;
    163 	epp->ep_entry = execp->a_entry;
    164 
    165 	/* set up command for text and data segments */
    166 	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
    167 	    execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
    168 	    sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    169 
    170 	/* set up command for bss segment */
    171 	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
    172 	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
    173 	if (bsize > 0)
    174 		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
    175 		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    176 
    177 	/*
    178 	 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
    179 	 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
    180 	 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
    181 	 * respectively to page boundaries.
    182 	 * Compensate `ep_dsize' for the amount of data covered by the last
    183 	 * text page.
    184 	 */
    185 	dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
    186 	epp->ep_dsize = (dsize > 0) ? dsize : 0;
    187 	return exec_aout_setup_stack(p, epp);
    188 }
    189