compat_exec.c revision 1.6
1/* $NetBSD: compat_exec.c,v 1.6 2002/09/27 15:37:03 provos 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/cdefs.h> 34__KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.6 2002/09/27 15:37:03 provos Exp $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/proc.h> 39#include <sys/malloc.h> 40#include <sys/vnode.h> 41#include <sys/exec.h> 42#include <sys/resourcevar.h> 43 44/* 45 * exec_aout_prep_oldzmagic(): 46 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 47 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 48 * 49 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 50 * description of operation is there. 51 * There were copies of this in the mac68k, hp300, and i386 ports. 52 */ 53int 54exec_aout_prep_oldzmagic(p, epp) 55 struct proc *p; 56 struct exec_package *epp; 57{ 58 struct exec *execp = epp->ep_hdr; 59 60 epp->ep_taddr = 0; 61 epp->ep_tsize = execp->a_text; 62 epp->ep_daddr = epp->ep_taddr + execp->a_text; 63 epp->ep_dsize = execp->a_data + execp->a_bss; 64 epp->ep_entry = execp->a_entry; 65 66 /* 67 * check if vnode is in open for writing, because we want to 68 * demand-page out of it. if it is, don't do it, for various 69 * reasons 70 */ 71 if ((execp->a_text != 0 || execp->a_data != 0) && 72 epp->ep_vp->v_writecount != 0) { 73#ifdef DIAGNOSTIC 74 if (epp->ep_vp->v_flag & VTEXT) 75 panic("exec: a VTEXT vnode has writecount != 0"); 76#endif 77 return ETXTBSY; 78 } 79 epp->ep_vp->v_flag |= VTEXT; 80 81 /* set up command for text segment */ 82 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 83 epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */ 84 VM_PROT_READ|VM_PROT_EXECUTE); 85 86 /* set up command for data segment */ 87 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 88 epp->ep_daddr, epp->ep_vp, 89 execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */ 90 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 91 92 /* set up command for bss segment */ 93 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 94 epp->ep_daddr + execp->a_data, NULLVP, 0, 95 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 96 97 return exec_aout_setup_stack(p, epp); 98} 99 100 101/* 102 * exec_aout_prep_oldnmagic(): 103 * Prepare the vmcmds to build a vmspace for an old NMAGIC 104 * binary. [BSDI] 105 * 106 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 107 * at 0. 108 * XXX: There must be a better way to share this code. 109 */ 110int 111exec_aout_prep_oldnmagic(p, epp) 112 struct proc *p; 113 struct exec_package *epp; 114{ 115 struct exec *execp = epp->ep_hdr; 116 long bsize, baddr; 117 118 epp->ep_taddr = 0; 119 epp->ep_tsize = execp->a_text; 120 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 121 epp->ep_dsize = execp->a_data + execp->a_bss; 122 epp->ep_entry = execp->a_entry; 123 124 /* set up command for text segment */ 125 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 126 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 127 VM_PROT_READ|VM_PROT_EXECUTE); 128 129 /* set up command for data segment */ 130 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 131 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 132 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 133 134 /* set up command for bss segment */ 135 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 136 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 137 if (bsize > 0) 138 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 139 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 140 141 return exec_aout_setup_stack(p, epp); 142} 143 144 145/* 146 * exec_aout_prep_oldomagic(): 147 * Prepare the vmcmds to build a vmspace for an old OMAGIC 148 * binary. [BSDI] 149 * 150 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 151 * at 0. 152 * XXX: There must be a better way to share this code. 153 */ 154int 155exec_aout_prep_oldomagic(p, epp) 156 struct proc *p; 157 struct exec_package *epp; 158{ 159 struct exec *execp = epp->ep_hdr; 160 long dsize, bsize, baddr; 161 162 epp->ep_taddr = 0; 163 epp->ep_tsize = execp->a_text; 164 epp->ep_daddr = epp->ep_taddr + execp->a_text; 165 epp->ep_dsize = execp->a_data + execp->a_bss; 166 epp->ep_entry = execp->a_entry; 167 168 /* set up command for text and data segments */ 169 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 170 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 171 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 172 173 /* set up command for bss segment */ 174 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 175 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 176 if (bsize > 0) 177 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 178 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 179 180 /* 181 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 182 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 183 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 184 * respectively to page boundaries. 185 * Compensate `ep_dsize' for the amount of data covered by the last 186 * text page. 187 */ 188 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 189 epp->ep_dsize = (dsize > 0) ? dsize : 0; 190 return exec_aout_setup_stack(p, epp); 191} 192