1 /* $NetBSD: compat_exec.c,v 1.3 2000/06/28 15:39:24 mrg 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 vn_marktext(epp->ep_vp); 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