vax1k_exec.c revision 1.8.2.5
1 /* $NetBSD: vax1k_exec.c,v 1.8.2.5 2004/09/21 13:26:14 skrll 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/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: vax1k_exec.c,v 1.8.2.5 2004/09/21 13:26:14 skrll Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/malloc.h> 49 #include <sys/vnode.h> 50 #include <sys/exec.h> 51 #include <sys/resourcevar.h> 52 53 #include <compat/vax1k/vax1k_exec.h> 54 55 #if defined(_KERNEL_OPT) 56 #include "opt_compat_43.h" 57 #else 58 #define COMPAT_43 /* enable 4.3BSD binaries for lkm */ 59 #endif 60 61 int exec_vax1k_prep_anymagic __P((struct proc *p, struct exec_package *epp, 62 int, int)); 63 64 /* 65 * exec_vax1k_makecmds(): Check if it's an a.out-format executable 66 * with an vax1k magic number. 67 * 68 * Given a proc pointer and an exec package pointer, see if the referent 69 * of the epp is in a.out format. Just check 'standard' magic numbers for 70 * this architecture. 71 * 72 * This function, in the former case, or the hook, in the latter, is 73 * responsible for creating a set of vmcmds which can be used to build 74 * the process's vm space and inserting them into the exec package. 75 */ 76 77 int 78 exec_vax1k_makecmds(l, epp) 79 struct lwp *l; 80 struct exec_package *epp; 81 { 82 u_long midmag, magic; 83 u_short mid; 84 int error; 85 struct exec *execp = epp->ep_hdr; 86 struct proc *p = l->l_proc; 87 88 if (epp->ep_hdrvalid < sizeof(struct exec)) 89 return ENOEXEC; 90 91 midmag = ntohl(execp->a_midmag); 92 mid = (midmag >> 16) & 0x3ff; 93 magic = midmag & 0xffff; 94 95 midmag = mid << 16 | magic; 96 97 switch (midmag) { 98 case (MID_VAX1K << 16) | ZMAGIC: 99 error = exec_vax1k_prep_anymagic(p, epp, 0, 0); 100 goto done; 101 102 case (MID_VAX1K << 16) | NMAGIC: 103 error = exec_vax1k_prep_anymagic(p, epp, 104 sizeof(struct exec), 1); 105 goto done; 106 107 case (MID_VAX1K << 16) | OMAGIC: 108 error = exec_vax1k_prep_anymagic(p, epp, 109 sizeof(struct exec), 0); 110 goto done; 111 } 112 113 #ifdef COMPAT_43 114 /* 115 * 4.3BSD pre-dates CPU midmag (e.g. MID_VAX1K). instead, we 116 * expect a magic number in native byte order. 117 */ 118 switch (execp->a_midmag) { 119 case ZMAGIC: 120 error = exec_vax1k_prep_anymagic(p, epp, VAX1K_LDPGSZ, 0); 121 goto done; 122 123 case NMAGIC: 124 error = exec_vax1k_prep_anymagic(p, epp, 125 sizeof(struct exec), 1); 126 goto done; 127 128 case OMAGIC: 129 error = exec_vax1k_prep_anymagic(p, epp, 130 sizeof(struct exec), 0); 131 goto done; 132 } 133 #endif 134 135 /* failed... */ 136 error = ENOEXEC; 137 138 done: 139 if (error) 140 kill_vmcmds(&epp->ep_vmcmds); 141 142 return error; 143 } 144 145 /* 146 * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package 147 * 148 * First, set of the various offsets/lengths in the exec package. 149 * Note that all code is mapped RW; no protection, but because it is 150 * only used for compatibility it won't hurt. 151 * 152 */ 153 int 154 exec_vax1k_prep_anymagic(p, epp, text_foffset, textpad) 155 struct proc *p; 156 struct exec_package *epp; 157 int text_foffset, textpad; 158 { 159 struct exec *execp = epp->ep_hdr; 160 161 epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1); 162 epp->ep_tsize = execp->a_text; 163 epp->ep_daddr = epp->ep_taddr + epp->ep_tsize; 164 if (textpad) /* pad for NMAGIC? */ 165 epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) & 166 ~(VAX1K_LDPGSZ - 1); 167 epp->ep_dsize = execp->a_data; 168 epp->ep_entry = execp->a_entry; 169 170 /* first allocate memory for text+data+bss */ 171 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 172 round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) - 173 trunc_page(epp->ep_taddr), /* size */ 174 trunc_page(epp->ep_taddr), NULLVP, /* addr, vnode */ 175 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 176 177 /* then read the text in the area we just allocated */ 178 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, 179 epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset, 180 VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); 181 182 /* next read the data */ 183 if (epp->ep_dsize) { 184 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, 185 epp->ep_dsize, epp->ep_daddr, epp->ep_vp, 186 text_foffset + epp->ep_tsize, 187 VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); 188 } 189 190 /* now bump up the dsize to include the bss so that sbrk works */ 191 epp->ep_dsize += execp->a_bss; 192 193 /* finally, setup the stack ... */ 194 return (*epp->ep_esch->es_setup_stack)(p, epp); 195 } 196
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