compat_exec.c revision 1.1.26.1
1 /* $NetBSD: compat_exec.c,v 1.1.26.1 1999/07/04 01:33:34 chs 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 78 /* 79 * mark this vnode as being the image of a running process. 80 * also flush any cached file mappings now so the process will 81 * have a better chance of being able to use the cache. 82 */ 83 84 epp->ep_vp->v_flag |= VTEXT; 85 ubc_flush(&epp->ep_vp->v_uvm.u_obj, 0, 0); 86 87 /* set up command for text segment */ 88 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 89 epp->ep_taddr, epp->ep_vp, NBPG, /* XXX should NBPG be CLBYTES? */ 90 VM_PROT_READ|VM_PROT_EXECUTE); 91 92 /* set up command for data segment */ 93 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 94 epp->ep_daddr, epp->ep_vp, 95 execp->a_text + NBPG, /* XXX should NBPG be CLBYTES? */ 96 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 97 98 /* set up command for bss segment */ 99 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 100 epp->ep_daddr + execp->a_data, NULLVP, 0, 101 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 102 103 return exec_aout_setup_stack(p, epp); 104 } 105 106 107 /* 108 * exec_aout_prep_oldnmagic(): 109 * Prepare the vmcmds to build a vmspace for an old NMAGIC 110 * binary. [BSDI] 111 * 112 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 113 * at 0. 114 * XXX: There must be a better way to share this code. 115 */ 116 int 117 exec_aout_prep_oldnmagic(p, epp) 118 struct proc *p; 119 struct exec_package *epp; 120 { 121 struct exec *execp = epp->ep_hdr; 122 long bsize, baddr; 123 124 epp->ep_taddr = 0; 125 epp->ep_tsize = execp->a_text; 126 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, __LDPGSZ); 127 epp->ep_dsize = execp->a_data + execp->a_bss; 128 epp->ep_entry = execp->a_entry; 129 130 /* set up command for text segment */ 131 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 132 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 133 VM_PROT_READ|VM_PROT_EXECUTE); 134 135 /* set up command for data segment */ 136 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 137 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 138 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 139 140 /* set up command for bss segment */ 141 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 142 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 143 if (bsize > 0) 144 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 145 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 146 147 return exec_aout_setup_stack(p, epp); 148 } 149 150 151 /* 152 * exec_aout_prep_oldomagic(): 153 * Prepare the vmcmds to build a vmspace for an old OMAGIC 154 * binary. [BSDI] 155 * 156 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 157 * at 0. 158 * XXX: There must be a better way to share this code. 159 */ 160 int 161 exec_aout_prep_oldomagic(p, epp) 162 struct proc *p; 163 struct exec_package *epp; 164 { 165 struct exec *execp = epp->ep_hdr; 166 long dsize, bsize, baddr; 167 168 epp->ep_taddr = 0; 169 epp->ep_tsize = execp->a_text; 170 epp->ep_daddr = epp->ep_taddr + execp->a_text; 171 epp->ep_dsize = execp->a_data + execp->a_bss; 172 epp->ep_entry = execp->a_entry; 173 174 /* set up command for text and data segments */ 175 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 176 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 177 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 178 179 /* set up command for bss segment */ 180 baddr = roundup(epp->ep_daddr + execp->a_data, NBPG); 181 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 182 if (bsize > 0) 183 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 184 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 185 186 /* 187 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 188 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 189 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 190 * respectively to page boundaries. 191 * Compensate `ep_dsize' for the amount of data covered by the last 192 * text page. 193 */ 194 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG); 195 epp->ep_dsize = (dsize > 0) ? dsize : 0; 196 return exec_aout_setup_stack(p, epp); 197 } 198
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