exec_ecoff.c revision 1.2
1 /* 2 * Copyright (c) 1994 Adam Glass 3 * Copyright (c) 1993, 1994 Christopher G. Demetriou 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $Id: exec_ecoff.c,v 1.2 1994/05/28 20:21:30 glass Exp $ 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 = epp->ep_hdr + sizeof(struct ecoff_filehdr); 86 switch (eap->ea_magic) { 87 case ECOFF_OMAGIC: 88 error = exec_ecoff_prep_omagic(p, epp, efp, eap); 89 break; 90 case ECOFF_NMAGIC: 91 error = exec_ecoff_prep_nmagic(p, epp, efp, eap); 92 break; 93 case ECOFF_ZMAGIC: 94 error = exec_ecoff_prep_zmagic(p, epp, efp, eap); 95 break; 96 default: 97 return ENOEXEC; 98 } 99 100 if (error == 0) 101 error = cpu_exec_ecoff_hook(p, epp, eap); 102 103 if (error) 104 kill_vmcmds(&epp->ep_vmcmds); 105 106 bad: 107 return error; 108 } 109 110 /* 111 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 112 * executable. 113 * 114 * Note that the ep_ssize parameter must be set to be the current stack 115 * limit; this is adjusted in the body of execve() to yield the 116 * appropriate stack segment usage once the argument length is 117 * calculated. 118 * 119 * This function returns an int for uniformity with other (future) formats' 120 * stack setup functions. They might have errors to return. 121 */ 122 123 int 124 exec_ecoff_setup_stack(p, epp) 125 struct proc *p; 126 struct exec_package *epp; 127 { 128 129 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 130 epp->ep_minsaddr = USRSTACK; 131 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 132 133 /* 134 * set up commands for stack. note that this takes *two*, one to 135 * map the part of the stack which we can access, and one to map 136 * the part which we can't. 137 * 138 * arguably, it could be made into one, but that would require the 139 * addition of another mapping proc, which is unnecessary 140 * 141 * note that in memory, things assumed to be: 0 ....... ep_maxsaddr 142 * <stack> ep_minsaddr 143 */ 144 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 145 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 146 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 147 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 148 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 149 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 150 151 return 0; 152 } 153 154 155 /* 156 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 157 */ 158 159 int 160 exec_ecoff_prep_omagic(p, epp, efp, eap) 161 struct proc *p; 162 struct exec_package *epp; 163 struct ecoff_filehdr *efp; 164 struct ecoff_aouthdr *eap; 165 { 166 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 167 epp->ep_tsize = eap->ea_tsize; 168 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 169 epp->ep_dsize = eap->ea_dsize; 170 epp->ep_entry = eap->ea_entry; 171 172 /* set up command for text and data segments */ 173 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 174 eap->ea_tsize + eap->ea_dsize, epp->ep_taddr, epp->ep_vp, 175 ECOFF_TXTOFF(efp, eap), 176 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 177 178 /* set up command for bss segment */ 179 if (eap->ea_bsize > 0) 180 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 181 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 182 NULLVP, 0, 183 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 184 185 return exec_ecoff_setup_stack(p, epp); 186 } 187 188 /* 189 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 190 * package. 191 */ 192 193 int 194 exec_ecoff_prep_nmagic(p, epp, efp, eap) 195 struct proc *p; 196 struct exec_package *epp; 197 struct ecoff_filehdr *efp; 198 struct ecoff_aouthdr *eap; 199 { 200 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 201 epp->ep_tsize = eap->ea_tsize; 202 epp->ep_daddr = ECOFF_ROUND(eap->ea_data_start, ECOFF_LDPGSZ); 203 epp->ep_dsize = eap->ea_dsize; 204 epp->ep_entry = eap->ea_entry; 205 206 /* set up command for text segment */ 207 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 208 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 209 VM_PROT_READ|VM_PROT_EXECUTE); 210 211 /* set up command for data segment */ 212 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 213 epp->ep_daddr, epp->ep_vp, ECOFF_DATOFF(efp, eap), 214 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 215 216 /* set up command for bss segment */ 217 if (eap->ea_bsize > 0) 218 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 219 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 220 NULLVP, 0, 221 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 222 223 return exec_ecoff_setup_stack(p, epp); 224 } 225 226 /* 227 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 228 * 229 * First, set the various offsets/lengths in the exec package. 230 * 231 * Then, mark the text image busy (so it can be demand paged) or error 232 * out if this is not possible. Finally, set up vmcmds for the 233 * text, data, bss, and stack segments. 234 */ 235 236 int 237 exec_ecoff_prep_zmagic(p, epp, efp, eap) 238 struct proc *p; 239 struct exec_package *epp; 240 struct ecoff_filehdr *efp; 241 struct ecoff_aouthdr *eap; 242 { 243 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 244 epp->ep_tsize = eap->ea_tsize; 245 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 246 epp->ep_dsize = eap->ea_dsize; 247 epp->ep_entry = eap->ea_entry; 248 249 /* 250 * check if vnode is in open for writing, because we want to 251 * demand-page out of it. if it is, don't do it, for various 252 * reasons 253 */ 254 if ((eap->ea_tsize != 0 || eap->ea_dsize != 0) && 255 epp->ep_vp->v_writecount != 0) { 256 #ifdef DIAGNOSTIC 257 if (epp->ep_vp->v_flag & VTEXT) 258 panic("exec: a VTEXT vnode has writecount != 0\n"); 259 #endif 260 return ETXTBSY; 261 } 262 epp->ep_vp->v_flag |= VTEXT; 263 264 /* set up command for text segment */ 265 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_tsize, 266 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 267 VM_PROT_READ|VM_PROT_EXECUTE); 268 269 /* set up command for data segment */ 270 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_dsize, 271 epp->ep_daddr, epp->ep_vp, 272 ECOFF_DATOFF(efp, eap), 273 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 274 275 /* set up command for bss segment */ 276 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 277 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), NULLVP, 0, 278 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 279 280 return exec_ecoff_setup_stack(p, epp); 281 } 282
Indexes created Thu Sep 25 16:09:42 GMT 2025