compat_exec.c revision 1.11
1 /* $NetBSD: compat_exec.c,v 1.11 2003/11/19 15:48:21 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.11 2003/11/19 15:48:21 christos Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/vnode.h> 40 #include <sys/exec.h> 41 #include <sys/resourcevar.h> 42 43 /* 44 * exec_aout_prep_oldzmagic(): 45 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 46 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 47 * 48 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 49 * description of operation is there. 50 * There were copies of this in the mac68k, hp300, and i386 ports. 51 */ 52 int 53 exec_aout_prep_oldzmagic(p, epp) 54 struct proc *p; 55 struct exec_package *epp; 56 { 57 struct exec *execp = epp->ep_hdr; 58 int error; 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 error = vn_marktext(epp->ep_vp); 67 if (error) 68 return (error); 69 70 /* set up command for text segment */ 71 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 72 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */ 73 VM_PROT_READ|VM_PROT_EXECUTE); 74 75 /* set up command for data segment */ 76 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 77 epp->ep_daddr, epp->ep_vp, 78 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */ 79 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 80 81 /* set up command for bss segment */ 82 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 83 epp->ep_daddr + execp->a_data, NULLVP, 0, 84 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 85 86 return (*epp->ep_esch->es_setup_stack)(p, epp); 87 } 88 89 90 /* 91 * exec_aout_prep_oldnmagic(): 92 * Prepare the vmcmds to build a vmspace for an old NMAGIC 93 * binary. [BSDI] 94 * 95 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 96 * at 0. 97 * XXX: There must be a better way to share this code. 98 */ 99 int 100 exec_aout_prep_oldnmagic(p, epp) 101 struct proc *p; 102 struct exec_package *epp; 103 { 104 struct exec *execp = epp->ep_hdr; 105 long bsize, baddr; 106 107 epp->ep_taddr = 0; 108 epp->ep_tsize = execp->a_text; 109 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ); 110 epp->ep_dsize = execp->a_data + execp->a_bss; 111 epp->ep_entry = execp->a_entry; 112 113 /* set up command for text segment */ 114 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 115 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 116 VM_PROT_READ|VM_PROT_EXECUTE); 117 118 /* set up command for data segment */ 119 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 120 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 121 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 122 123 /* set up command for bss segment */ 124 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 125 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 126 if (bsize > 0) 127 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 128 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 129 130 return (*epp->ep_esch->es_setup_stack)(p, epp); 131 } 132 133 134 /* 135 * exec_aout_prep_oldomagic(): 136 * Prepare the vmcmds to build a vmspace for an old OMAGIC 137 * binary. [BSDI] 138 * 139 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 140 * at 0. 141 * XXX: There must be a better way to share this code. 142 */ 143 int 144 exec_aout_prep_oldomagic(p, epp) 145 struct proc *p; 146 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)(p, epp); 181 } 182
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