vax1k_exec.c revision 1.16
1 /* $NetBSD: vax1k_exec.c,v 1.16 2008/11/19 18:36:06 ad 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 1.16 2008/11/19 18:36:06 ad 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 #include <sys/module.h> 53 54 #include <compat/vax1k/vax1k_exec.h> 55 56 #if defined(_KERNEL_OPT) 57 #include "opt_compat_43.h" 58 #include "opt_coredump.h" 59 #else 60 #define COMPAT_43 /* enable 4.3BSD binaries for lkm */ 61 #endif 62 63 #ifdef COREDUMP 64 MODULE(MODULE_CLASS_MISC, exec_vax1k, "coredump"); 65 #else 66 MODULE(MODULE_CLASS_MISC, exec_vax1k, NULL); 67 #endif 68 69 int exec_vax1k_prep_anymagic(struct lwp *, struct exec_package *, 70 size_t, bool); 71 72 static struct execsw exec_vax1k_execsw[] = { 73 /* NetBSD vax1k a.out */ 74 { sizeof(struct exec), 75 exec_vax1k_makecmds, 76 { NULL }, 77 &emul_netbsd, 78 EXECSW_PRIO_ANY, 79 0, 80 copyargs, 81 NULL, 82 coredump_netbsd, 83 exec_setup_stack }, 84 }; 85 86 static int 87 exec_vax1k_modcmd(modcmd_t cmd, void *arg) 88 { 89 90 switch (cmd) { 91 case MODULE_CMD_INIT: 92 return exec_add(exec_vax1k_execsw, 93 __arraycount(exec_vax1k_execsw)); 94 95 case MODULE_CMD_FINI: 96 return exec_remove(exec_vax1k_execsw, 97 __arraycount(exec_vax1k_execsw)); 98 99 default: 100 return ENOTTY; 101 } 102 } 103 104 /* 105 * exec_vax1k_makecmds(): Check if it's an a.out-format executable 106 * with an vax1k magic number. 107 * 108 * Given a proc pointer and an exec package pointer, see if the referent 109 * of the epp is in a.out format. Just check 'standard' magic numbers for 110 * this architecture. 111 * 112 * This function, in the former case, or the hook, in the latter, is 113 * responsible for creating a set of vmcmds which can be used to build 114 * the process's vm space and inserting them into the exec package. 115 */ 116 117 int 118 exec_vax1k_makecmds(struct lwp *l, struct exec_package *epp) 119 { 120 u_long midmag, magic; 121 u_short mid; 122 int error; 123 struct exec *execp = epp->ep_hdr; 124 125 if (epp->ep_hdrvalid < sizeof(struct exec)) 126 return ENOEXEC; 127 128 midmag = ntohl(execp->a_midmag); 129 mid = (midmag >> 16) & 0x3ff; 130 magic = midmag & 0xffff; 131 132 midmag = mid << 16 | magic; 133 134 switch (midmag) { 135 case (MID_VAX1K << 16) | ZMAGIC: 136 error = exec_vax1k_prep_anymagic(l, epp, 0, false); 137 goto done; 138 139 case (MID_VAX1K << 16) | NMAGIC: 140 error = exec_vax1k_prep_anymagic(l, epp, 141 sizeof(struct exec), true); 142 goto done; 143 144 case (MID_VAX1K << 16) | OMAGIC: 145 error = exec_vax1k_prep_anymagic(l, epp, 146 sizeof(struct exec), false); 147 goto done; 148 } 149 150 #ifdef COMPAT_43 151 /* 152 * 4.3BSD pre-dates CPU midmag (e.g. MID_VAX1K). instead, we 153 * expect a magic number in native byte order. 154 */ 155 switch (execp->a_midmag) { 156 case ZMAGIC: 157 error = exec_vax1k_prep_anymagic(l, epp, VAX1K_LDPGSZ, false); 158 goto done; 159 160 case NMAGIC: 161 error = exec_vax1k_prep_anymagic(l, epp, 162 sizeof(struct exec), true); 163 goto done; 164 165 case OMAGIC: 166 error = exec_vax1k_prep_anymagic(l, epp, 167 sizeof(struct exec), false); 168 goto done; 169 } 170 #endif 171 172 /* failed... */ 173 error = ENOEXEC; 174 175 done: 176 if (error) 177 kill_vmcmds(&epp->ep_vmcmds); 178 179 return error; 180 } 181 182 /* 183 * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package 184 * 185 * First, set of the various offsets/lengths in the exec package. 186 * Note that all code is mapped RW; no protection, but because it is 187 * only used for compatibility it won't hurt. 188 * 189 */ 190 int 191 exec_vax1k_prep_anymagic(struct lwp *l, struct exec_package *epp, 192 size_t text_foffset, bool textpad) 193 { 194 struct exec *execp = epp->ep_hdr; 195 196 epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1); 197 epp->ep_tsize = execp->a_text; 198 epp->ep_daddr = epp->ep_taddr + epp->ep_tsize; 199 if (textpad) /* pad for NMAGIC? */ 200 epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) & 201 ~(VAX1K_LDPGSZ - 1); 202 epp->ep_dsize = execp->a_data; 203 epp->ep_entry = execp->a_entry; 204 205 /* first allocate memory for text+data+bss */ 206 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 207 round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) - 208 trunc_page(epp->ep_taddr), /* size */ 209 trunc_page(epp->ep_taddr), NULLVP, /* addr, vnode */ 210 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 211 212 /* then read the text in the area we just allocated */ 213 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, 214 epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset, 215 VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); 216 217 /* next read the data */ 218 if (epp->ep_dsize) { 219 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn, 220 epp->ep_dsize, epp->ep_daddr, epp->ep_vp, 221 text_foffset + epp->ep_tsize, 222 VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE); 223 } 224 225 /* now bump up the dsize to include the bss so that sbrk works */ 226 epp->ep_dsize += execp->a_bss; 227 228 /* finally, setup the stack ... */ 229 return (*epp->ep_esch->es_setup_stack)(l, epp); 230 } 231
Indexes created Tue Sep 30 20:09:53 GMT 2025