compat_exec.c revision 1.16
1/* $NetBSD: compat_exec.c,v 1.16 2009/08/13 03:53:13 matt 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 1.16 2009/08/13 03:53:13 matt Exp $"); 35 36#ifdef _KERNEL_OPT 37#include "opt_execfmt.h" 38#endif 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/proc.h> 43#include <sys/vnode.h> 44#include <sys/exec.h> 45#include <sys/resourcevar.h> 46 47#ifdef EXEC_AOUT 48/* 49 * exec_aout_prep_oldzmagic(): 50 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 51 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 52 * 53 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 54 * description of operation is there. 55 * There were copies of this in the mac68k, hp300, and i386 ports. 56 */ 57int 58exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp) 59{ 60 struct exec *execp = epp->ep_hdr; 61 int error; 62 63 epp->ep_taddr = 0; 64 epp->ep_tsize = execp->a_text; 65 epp->ep_daddr = epp->ep_taddr + execp->a_text; 66 epp->ep_dsize = execp->a_data + execp->a_bss; 67 epp->ep_entry = execp->a_entry; 68 69 error = vn_marktext(epp->ep_vp); 70 if (error) 71 return (error); 72 73 /* set up command for text segment */ 74 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 75 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */ 76 VM_PROT_READ|VM_PROT_EXECUTE); 77 78 /* set up command for data segment */ 79 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 80 epp->ep_daddr, epp->ep_vp, 81 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */ 82 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 83 84 /* set up command for bss segment */ 85 if (execp->a_bss) 86 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 87 epp->ep_daddr + execp->a_data, NULLVP, 0, 88 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 89 90 return (*epp->ep_esch->es_setup_stack)(l, epp); 91} 92 93 94/* 95 * exec_aout_prep_oldnmagic(): 96 * Prepare the vmcmds to build a vmspace for an old NMAGIC 97 * binary. [BSDI] 98 * 99 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 100 * at 0. 101 * XXX: There must be a better way to share this code. 102 */ 103int 104exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp) 105{ 106 struct exec *execp = epp->ep_hdr; 107 long bsize, baddr; 108 109 epp->ep_taddr = 0; 110 epp->ep_tsize = execp->a_text; 111 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ); 112 epp->ep_dsize = execp->a_data + execp->a_bss; 113 epp->ep_entry = execp->a_entry; 114 115 /* set up command for text segment */ 116 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 117 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 118 VM_PROT_READ|VM_PROT_EXECUTE); 119 120 /* set up command for data segment */ 121 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 122 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 123 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 124 125 /* set up command for bss segment */ 126 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 127 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 128 if (bsize > 0) 129 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 130 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 131 132 return (*epp->ep_esch->es_setup_stack)(l, epp); 133} 134 135 136/* 137 * exec_aout_prep_oldomagic(): 138 * Prepare the vmcmds to build a vmspace for an old OMAGIC 139 * binary. [BSDI] 140 * 141 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 142 * at 0. 143 * XXX: There must be a better way to share this code. 144 */ 145int 146exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp) 147{ 148 struct exec *execp = epp->ep_hdr; 149 long dsize, bsize, baddr; 150 151 epp->ep_taddr = 0; 152 epp->ep_tsize = execp->a_text; 153 epp->ep_daddr = epp->ep_taddr + execp->a_text; 154 epp->ep_dsize = execp->a_data + execp->a_bss; 155 epp->ep_entry = execp->a_entry; 156 157 /* set up command for text and data segments */ 158 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 159 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 160 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 161 162 /* set up command for bss segment */ 163 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 164 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 165 if (bsize > 0) 166 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 167 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 168 169 /* 170 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 171 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 172 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 173 * respectively to page boundaries. 174 * Compensate `ep_dsize' for the amount of data covered by the last 175 * text page. 176 */ 177 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 178 PAGE_SIZE); 179 epp->ep_dsize = (dsize > 0) ? dsize : 0; 180 return (*epp->ep_esch->es_setup_stack)(l, epp); 181} 182#endif /* EXEC_AOUT */ 183