1 /* $NetBSD: vax1k_exec.c,v 1.2 2000/06/28 15:39:37 mrg 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 /* 34 * Exec glue to provide compatibility with older NetBSD vax1k exectuables. 35 * 36 * Because NetBSD/vax now uses 4k page size, older binaries (that started 37 * on an 1k boundary) cannot be mmap'ed. Therefore they are read in 38 * (via vn_rdwr) as OMAGIC binaries and executed. This will use a little 39 * bit more memory, but otherwise won't affect the execution speed. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/malloc.h> 46 #include <sys/vnode.h> 47 #include <sys/exec.h> 48 #include <sys/resourcevar.h> 49 50 #include <compat/vax1k/vax1k_exec.h> 51 52 int exec_vax1k_prep_anymagic 53 __P((struct proc *, struct exec_package *, int)); 54 55 /* 56 * exec_vax1k_makecmds(): Check if it's an a.out-format executable 57 * with an vax1k magic number. 58 * 59 * Given a proc pointer and an exec package pointer, see if the referent 60 * of the epp is in a.out format. Just check 'standard' magic numbers for 61 * this architecture. 62 * 63 * This function, in the former case, or the hook, in the latter, is 64 * responsible for creating a set of vmcmds which can be used to build 65 * the process's vm space and inserting them into the exec package. 66 */ 67 68 int 69 exec_vax1k_makecmds(p, epp) 70 struct proc *p; 71 struct exec_package *epp; 72 { 73 u_long midmag, magic; 74 u_short mid; 75 int error; 76 struct exec *execp = epp->ep_hdr; 77 78 if (epp->ep_hdrvalid < sizeof(struct exec)) 79 return ENOEXEC; 80 81 midmag = ntohl(execp->a_midmag); 82 mid = (midmag >> 16) & 0x3ff; 83 magic = midmag & 0xffff; 84 85 midmag = mid << 16 | magic; 86 87 switch (midmag) { 88 case (MID_VAX1K << 16) | ZMAGIC: 89 error = exec_vax1k_prep_anymagic(p, epp, 0); 90 break; 91 92 case (MID_VAX1K << 16) | NMAGIC: 93 case (MID_VAX1K << 16) | OMAGIC: 94 error = exec_vax1k_prep_anymagic(p, epp, sizeof(struct exec)); 95 break; 96 97 default: 98 error = ENOEXEC; 99 } 100 101 if (error) 102 kill_vmcmds(&epp->ep_vmcmds); 103 104 return error; 105 } 106 107 /* 108 * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package 109 * 110 * First, set of the various offsets/lengths in the exec package. 111 * Note that all code is mapped RW; no protection, but because it is 112 * only used for compatibility it won't hurt. 113 * 114 */ 115 int 116 exec_vax1k_prep_anymagic(p, epp, off) 117 struct proc *p; 118 struct exec_package *epp; 119 int off; 120 { 121 long etmp, tmp; 122 struct exec *execp = epp->ep_hdr; 123 124 epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1); 125 epp->ep_tsize = execp->a_text + execp->a_data; 126 epp->ep_daddr = epp->ep_tsize + epp->ep_taddr; 127 epp->ep_dsize = execp->a_bss; 128 epp->ep_entry = execp->a_entry; 129 130 /* set up command for text segment */ 131 NEW_VMCMD(&epp->ep_vmcmds, vax1k_map_readvn, 132 epp->ep_tsize, epp->ep_taddr, epp->ep_vp, off, 133 VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); 134 135 tmp = round_page(epp->ep_daddr); 136 etmp = execp->a_bss - (tmp - epp->ep_daddr); 137 138 /* set up command for bss segment */ 139 if (etmp > 0) 140 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, etmp, tmp, NULLVP, 0, 141 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 142 143 return exec_aout_setup_stack(p, epp); 144 } 145