| 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 | |