compat_exec.c revision 1.1
1 /* $NetBSD: compat_exec.c,v 1.1 1996/05/18 15:52:21 christos 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 #include <vm/vm.h> 41 42 /* 43 * exec_aout_prep_oldzmagic(): 44 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 45 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 46 * 47 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 48 * description of operation is there. 49 * There were copies of this in the mac68k, hp300, and i386 ports. 50 */ 51 int 52 exec_aout_prep_oldzmagic(p, epp) 53 struct proc *p; 54 struct exec_package *epp; 55 { 56 struct exec *execp = epp->ep_hdr; 57 58 epp->ep_taddr = 0; 59 epp->ep_tsize = execp->a_text; 60 epp->ep_daddr = epp->ep_taddr + execp->a_text; 61 epp->ep_dsize = execp->a_data + execp->a_bss; 62 epp->ep_entry = execp->a_entry; 63 64 /* 65 * check if vnode is in open for writing, because we want to 66 * demand-page out of it. if it is, don't do it, for various 67 * reasons 68 */ 69 if ((execp->a_text != 0 || execp->a_data != 0) && 70 epp->ep_vp->v_writecount != 0) { 71 #ifdef DIAGNOSTIC 72 if (epp->ep_vp->v_flag & VTEXT) 73 panic("exec: a VTEXT vnode has writecount != 0\n"); 74 #endif 75 return ETXTBSY; 76 } 77 epp->ep_vp->v_flag |= VTEXT; 78 79 /* set up command for text segment */ 80 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 81 epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */ 82 VM_PROT_READ|VM_PROT_EXECUTE); 83 84 /* set up command for data segment */ 85 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 86 epp->ep_daddr, epp->ep_vp, 87 execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */ 88 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 89 90 /* set up command for bss segment */ 91 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 92 epp->ep_daddr + execp->a_data, NULLVP, 0, 93 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 94 95 return exec_aout_setup_stack(p, epp); 96 } 97 98 99 /* 100 * exec_aout_prep_oldnmagic(): 101 * Prepare the vmcmds to build a vmspace for an old NMAGIC 102 * binary. [BSDI] 103 * 104 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 105 * at 0. 106 * XXX: There must be a better way to share this code. 107 */ 108 int 109 exec_aout_prep_oldnmagic(p, epp) 110 struct proc *p; 111 struct exec_package *epp; 112 { 113 struct exec *execp = epp->ep_hdr; 114 long bsize, baddr; 115 116 epp->ep_taddr = 0; 117 epp->ep_tsize = execp->a_text; 118 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 119 epp->ep_dsize = execp->a_data + execp->a_bss; 120 epp->ep_entry = execp->a_entry; 121 122 /* set up command for text segment */ 123 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 124 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 125 VM_PROT_READ|VM_PROT_EXECUTE); 126 127 /* set up command for data segment */ 128 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 129 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 130 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 131 132 /* set up command for bss segment */ 133 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 134 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 135 if (bsize > 0) 136 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 137 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 138 139 return exec_aout_setup_stack(p, epp); 140 } 141 142 143 /* 144 * exec_aout_prep_oldomagic(): 145 * Prepare the vmcmds to build a vmspace for an old OMAGIC 146 * binary. [BSDI] 147 * 148 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 149 * at 0. 150 * XXX: There must be a better way to share this code. 151 */ 152 int 153 exec_aout_prep_oldomagic(p, epp) 154 struct proc *p; 155 struct exec_package *epp; 156 { 157 struct exec *execp = epp->ep_hdr; 158 long dsize, bsize, baddr; 159 160 epp->ep_taddr = 0; 161 epp->ep_tsize = execp->a_text; 162 epp->ep_daddr = epp->ep_taddr + execp->a_text; 163 epp->ep_dsize = execp->a_data + execp->a_bss; 164 epp->ep_entry = execp->a_entry; 165 166 /* set up command for text and data segments */ 167 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 168 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 169 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 170 171 /* set up command for bss segment */ 172 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 173 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 174 if (bsize > 0) 175 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 176 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 177 178 /* 179 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 180 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 181 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 182 * respectively to page boundaries. 183 * Compensate `ep_dsize' for the amount of data covered by the last 184 * text page. 185 */ 186 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 187 epp->ep_dsize = (dsize > 0) ? dsize : 0; 188 return exec_aout_setup_stack(p, epp); 189 } 190
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