1 /* $NetBSD: compat_exec.c,v 1.15 2007/12/08 18:35:53 dsl 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 1.15 2007/12/08 18:35:53 dsl 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(struct lwp *l, struct exec_package *epp) 54 { 55 struct exec *execp = epp->ep_hdr; 56 int error; 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 error = vn_marktext(epp->ep_vp); 65 if (error) 66 return (error); 67 68 /* set up command for text segment */ 69 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 70 epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */ 71 VM_PROT_READ|VM_PROT_EXECUTE); 72 73 /* set up command for data segment */ 74 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 75 epp->ep_daddr, epp->ep_vp, 76 execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */ 77 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 78 79 /* set up command for bss segment */ 80 if (execp->a_bss) 81 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 82 epp->ep_daddr + execp->a_data, NULLVP, 0, 83 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 84 85 return (*epp->ep_esch->es_setup_stack)(l, epp); 86 } 87 88 89 /* 90 * exec_aout_prep_oldnmagic(): 91 * Prepare the vmcmds to build a vmspace for an old NMAGIC 92 * binary. [BSDI] 93 * 94 * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting 95 * at 0. 96 * XXX: There must be a better way to share this code. 97 */ 98 int 99 exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp) 100 { 101 struct exec *execp = epp->ep_hdr; 102 long bsize, baddr; 103 104 epp->ep_taddr = 0; 105 epp->ep_tsize = execp->a_text; 106 epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ); 107 epp->ep_dsize = execp->a_data + execp->a_bss; 108 epp->ep_entry = execp->a_entry; 109 110 /* set up command for text segment */ 111 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 112 epp->ep_taddr, epp->ep_vp, sizeof(struct exec), 113 VM_PROT_READ|VM_PROT_EXECUTE); 114 115 /* set up command for data segment */ 116 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 117 epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec), 118 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 119 120 /* set up command for bss segment */ 121 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 122 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 123 if (bsize > 0) 124 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 125 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 126 127 return (*epp->ep_esch->es_setup_stack)(l, epp); 128 } 129 130 131 /* 132 * exec_aout_prep_oldomagic(): 133 * Prepare the vmcmds to build a vmspace for an old OMAGIC 134 * binary. [BSDI] 135 * 136 * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting 137 * at 0. 138 * XXX: There must be a better way to share this code. 139 */ 140 int 141 exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp) 142 { 143 struct exec *execp = epp->ep_hdr; 144 long dsize, bsize, baddr; 145 146 epp->ep_taddr = 0; 147 epp->ep_tsize = execp->a_text; 148 epp->ep_daddr = epp->ep_taddr + execp->a_text; 149 epp->ep_dsize = execp->a_data + execp->a_bss; 150 epp->ep_entry = execp->a_entry; 151 152 /* set up command for text and data segments */ 153 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 154 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 155 sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 156 157 /* set up command for bss segment */ 158 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 159 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 160 if (bsize > 0) 161 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 162 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 163 164 /* 165 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 166 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 167 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 168 * respectively to page boundaries. 169 * Compensate `ep_dsize' for the amount of data covered by the last 170 * text page. 171 */ 172 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 173 PAGE_SIZE); 174 epp->ep_dsize = (dsize > 0) ? dsize : 0; 175 return (*epp->ep_esch->es_setup_stack)(l, epp); 176 } 177