exec_ecoff.c revision 1.3.2.2
1 /* $NetBSD: exec_ecoff.c,v 1.3.2.2 1994/08/18 22:44:03 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Adam Glass 5 * Copyright (c) 1993, 1994 Christopher G. Demetriou 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Christopher G. Demetriou. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/malloc.h> 38 #include <sys/vnode.h> 39 #include <sys/exec.h> 40 #include <sys/resourcevar.h> 41 #include <vm/vm.h> 42 43 #include <sys/exec_ecoff.h> 44 45 int exec_ecoff_prep_omagic __P((struct proc *, struct exec_package *, 46 struct ecoff_filehdr *, 47 struct ecoff_aouthdr *)); 48 int exec_ecoff_prep_nmagic __P((struct proc *, struct exec_package *, 49 struct ecoff_filehdr *, 50 struct ecoff_aouthdr *)); 51 int exec_ecoff_prep_zmagic __P((struct proc *, struct exec_package *, 52 struct ecoff_filehdr *, 53 struct ecoff_aouthdr *)); 54 int exec_ecoff_setup_stack __P((struct proc *, struct exec_package *)); 55 56 /* 57 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 58 * 59 * Given a proc pointer and an exec package pointer, see if the referent 60 * of the epp is in ecoff format. Check 'standard' magic numbers for 61 * this architecture. If that fails, return failure. 62 * 63 * This function is responsible for creating a set of vmcmds which can be 64 * used to build the process's vm space and inserting them into the exec 65 * package. 66 */ 67 68 int 69 exec_ecoff_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 ecoff_filehdr *efp = epp->ep_hdr; 77 struct ecoff_aouthdr *eap; 78 79 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 80 return ENOEXEC; 81 82 if (ECOFF_BADMAG(efp)) 83 return ENOEXEC; 84 85 eap = (struct ecoff_aouthdr *) 86 ((caddr_t)epp->ep_hdr + sizeof(struct ecoff_filehdr)); 87 switch (eap->ea_magic) { 88 case ECOFF_OMAGIC: 89 error = exec_ecoff_prep_omagic(p, epp, efp, eap); 90 break; 91 case ECOFF_NMAGIC: 92 error = exec_ecoff_prep_nmagic(p, epp, efp, eap); 93 break; 94 case ECOFF_ZMAGIC: 95 error = exec_ecoff_prep_zmagic(p, epp, efp, eap); 96 break; 97 default: 98 return ENOEXEC; 99 } 100 101 if (error == 0) 102 error = cpu_exec_ecoff_hook(p, epp, eap); 103 104 if (error) 105 kill_vmcmds(&epp->ep_vmcmds); 106 107 bad: 108 return error; 109 } 110 111 /* 112 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 113 * executable. 114 * 115 * Note that the ep_ssize parameter must be set to be the current stack 116 * limit; this is adjusted in the body of execve() to yield the 117 * appropriate stack segment usage once the argument length is 118 * calculated. 119 * 120 * This function returns an int for uniformity with other (future) formats' 121 * stack setup functions. They might have errors to return. 122 */ 123 124 int 125 exec_ecoff_setup_stack(p, epp) 126 struct proc *p; 127 struct exec_package *epp; 128 { 129 130 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 131 epp->ep_minsaddr = USRSTACK; 132 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 133 134 /* 135 * set up commands for stack. note that this takes *two*, one to 136 * map the part of the stack which we can access, and one to map 137 * the part which we can't. 138 * 139 * arguably, it could be made into one, but that would require the 140 * addition of another mapping proc, which is unnecessary 141 * 142 * note that in memory, things assumed to be: 0 ....... ep_maxsaddr 143 * <stack> ep_minsaddr 144 */ 145 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 146 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 147 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 148 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 149 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 150 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 151 152 return 0; 153 } 154 155 156 /* 157 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 158 */ 159 160 int 161 exec_ecoff_prep_omagic(p, epp, efp, eap) 162 struct proc *p; 163 struct exec_package *epp; 164 struct ecoff_filehdr *efp; 165 struct ecoff_aouthdr *eap; 166 { 167 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 168 epp->ep_tsize = eap->ea_tsize; 169 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 170 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 171 epp->ep_entry = eap->ea_entry; 172 173 /* set up command for text and data segments */ 174 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 175 eap->ea_tsize + eap->ea_dsize, epp->ep_taddr, epp->ep_vp, 176 ECOFF_TXTOFF(efp, eap), 177 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 178 179 /* set up command for bss segment */ 180 if (eap->ea_bsize > 0) 181 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 182 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 183 NULLVP, 0, 184 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 185 186 return exec_ecoff_setup_stack(p, epp); 187 } 188 189 /* 190 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 191 * package. 192 */ 193 194 int 195 exec_ecoff_prep_nmagic(p, epp, efp, eap) 196 struct proc *p; 197 struct exec_package *epp; 198 struct ecoff_filehdr *efp; 199 struct ecoff_aouthdr *eap; 200 { 201 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 202 epp->ep_tsize = eap->ea_tsize; 203 epp->ep_daddr = ECOFF_ROUND(eap->ea_data_start, ECOFF_LDPGSZ); 204 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 205 epp->ep_entry = eap->ea_entry; 206 207 /* set up command for text segment */ 208 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 209 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 210 VM_PROT_READ|VM_PROT_EXECUTE); 211 212 /* set up command for data segment */ 213 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 214 epp->ep_daddr, epp->ep_vp, ECOFF_DATOFF(efp, eap), 215 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 216 217 /* set up command for bss segment */ 218 if (eap->ea_bsize > 0) 219 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 220 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 221 NULLVP, 0, 222 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 223 224 return exec_ecoff_setup_stack(p, epp); 225 } 226 227 /* 228 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 229 * 230 * First, set the various offsets/lengths in the exec package. 231 * 232 * Then, mark the text image busy (so it can be demand paged) or error 233 * out if this is not possible. Finally, set up vmcmds for the 234 * text, data, bss, and stack segments. 235 */ 236 237 int 238 exec_ecoff_prep_zmagic(p, epp, efp, eap) 239 struct proc *p; 240 struct exec_package *epp; 241 struct ecoff_filehdr *efp; 242 struct ecoff_aouthdr *eap; 243 { 244 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 245 epp->ep_tsize = eap->ea_tsize; 246 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 247 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 248 epp->ep_entry = eap->ea_entry; 249 250 /* 251 * check if vnode is in open for writing, because we want to 252 * demand-page out of it. if it is, don't do it, for various 253 * reasons 254 */ 255 if ((eap->ea_tsize != 0 || eap->ea_dsize != 0) && 256 epp->ep_vp->v_writecount != 0) { 257 #ifdef DIAGNOSTIC 258 if (epp->ep_vp->v_flag & VTEXT) 259 panic("exec: a VTEXT vnode has writecount != 0\n"); 260 #endif 261 return ETXTBSY; 262 } 263 epp->ep_vp->v_flag |= VTEXT; 264 265 /* set up command for text segment */ 266 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_tsize, 267 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 268 VM_PROT_READ|VM_PROT_EXECUTE); 269 270 /* set up command for data segment */ 271 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_dsize, 272 epp->ep_daddr, epp->ep_vp, 273 ECOFF_DATOFF(efp, eap), 274 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 275 276 /* set up command for bss segment */ 277 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 278 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), NULLVP, 0, 279 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 280 281 return exec_ecoff_setup_stack(p, epp); 282 } 283
Indexes created Mon Sep 29 18:09:42 GMT 2025