compat_exec.c revision 1.17
1 /* $NetBSD: compat_exec.c,v 1.17 2009/08/15 23:39:35 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 1.17 2009/08/15 23:39:35 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 #include <sys/exec_aout.h> 49 50 /* 51 * exec_aout_prep_oldzmagic(): 52 * Prepare the vmcmds to build a vmspace for an old ZMAGIC 53 * binary. [386BSD/BSDI/4.4BSD/NetBSD0.8] 54 * 55 * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose 56 * description of operation is there. 57 * There were copies of this in the mac68k, hp300, and i386 ports. 58 */ 59 int 60 exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp) 61 { 62 struct exec *execp = epp->ep_hdr; 63 int error; 64 65 epp->ep_taddr = 0; 66 epp->ep_tsize = execp->a_text; 67 epp->ep_daddr = epp->ep_taddr + execp->a_text; 68 epp->ep_dsize = execp->a_data + execp->a_bss; 69 epp->ep_entry = execp->a_entry; 70 71 error = vn_marktext(epp->ep_vp); 72 if (error) 73 return (error); 74 75 /* set up command for text segment */ 76 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 77 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */ 78 VM_PROT_READ|VM_PROT_EXECUTE); 79 80 /* set up command for data segment */ 81 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 82 epp->ep_daddr, epp->ep_vp, 83 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */ 84 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 85 86 /* set up command for bss segment */ 87 if (execp->a_bss) 88 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 89 epp->ep_daddr + execp->a_data, NULLVP, 0, 90 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 91 92 return (*epp->ep_esch->es_setup_stack)(l, epp); 93 } 94 95 96 /* 97 * exec_aout_prep_oldnmagic(): 98 * Prepare the vmcmds to build a vmspace for an old NMAGIC 99 * binary. [BSDI] 100 * 101 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 102 * at 0. 103 * XXX: There must be a better way to share this code. 104 */ 105 int 106 exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp) 107 { 108 struct exec *execp = epp->ep_hdr; 109 long bsize, baddr; 110 111 epp->ep_taddr = 0; 112 epp->ep_tsize = execp->a_text; 113 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ); 114 epp->ep_dsize = execp->a_data + execp->a_bss; 115 epp->ep_entry = execp->a_entry; 116 117 /* set up command for text segment */ 118 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 119 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 120 VM_PROT_READ|VM_PROT_EXECUTE); 121 122 /* set up command for data segment */ 123 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 124 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 125 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 126 127 /* set up command for bss segment */ 128 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 129 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 130 if (bsize > 0) 131 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 132 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 133 134 return (*epp->ep_esch->es_setup_stack)(l, epp); 135 } 136 137 138 /* 139 * exec_aout_prep_oldomagic(): 140 * Prepare the vmcmds to build a vmspace for an old OMAGIC 141 * binary. [BSDI] 142 * 143 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 144 * at 0. 145 * XXX: There must be a better way to share this code. 146 */ 147 int 148 exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp) 149 { 150 struct exec *execp = epp->ep_hdr; 151 long dsize, bsize, baddr; 152 153 epp->ep_taddr = 0; 154 epp->ep_tsize = execp->a_text; 155 epp->ep_daddr = epp->ep_taddr + execp->a_text; 156 epp->ep_dsize = execp->a_data + execp->a_bss; 157 epp->ep_entry = execp->a_entry; 158 159 /* set up command for text and data segments */ 160 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 161 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 162 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 163 164 /* set up command for bss segment */ 165 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 166 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 167 if (bsize > 0) 168 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 169 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 170 171 /* 172 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 173 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 174 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 175 * respectively to page boundaries. 176 * Compensate `ep_dsize' for the amount of data covered by the last 177 * text page. 178 */ 179 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 180 PAGE_SIZE); 181 epp->ep_dsize = (dsize > 0) ? dsize : 0; 182 return (*epp->ep_esch->es_setup_stack)(l, epp); 183 } 184 #endif /* EXEC_AOUT */ 185
Indexes created Thu Sep 25 16:09:42 GMT 2025