exec_ecoff.c revision 1.6
1 1.6 christos /* $NetBSD: exec_ecoff.c,v 1.6 1996/03/07 14:31:16 christos Exp $ */ 2 1.3 cgd 3 1.1 glass /* 4 1.1 glass * Copyright (c) 1994 Adam Glass 5 1.1 glass * Copyright (c) 1993, 1994 Christopher G. Demetriou 6 1.1 glass * All rights reserved. 7 1.1 glass * 8 1.1 glass * Redistribution and use in source and binary forms, with or without 9 1.1 glass * modification, are permitted provided that the following conditions 10 1.1 glass * are met: 11 1.1 glass * 1. Redistributions of source code must retain the above copyright 12 1.1 glass * notice, this list of conditions and the following disclaimer. 13 1.1 glass * 2. Redistributions in binary form must reproduce the above copyright 14 1.1 glass * notice, this list of conditions and the following disclaimer in the 15 1.1 glass * documentation and/or other materials provided with the distribution. 16 1.1 glass * 3. All advertising materials mentioning features or use of this software 17 1.1 glass * must display the following acknowledgement: 18 1.1 glass * This product includes software developed by Christopher G. Demetriou. 19 1.1 glass * 4. The name of the author may not be used to endorse or promote products 20 1.1 glass * derived from this software without specific prior written permission 21 1.1 glass * 22 1.1 glass * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 1.1 glass * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 1.1 glass * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 1.1 glass * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 1.1 glass * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 1.1 glass * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 1.1 glass * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 1.1 glass * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 1.1 glass * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 1.1 glass * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 1.1 glass */ 33 1.1 glass 34 1.1 glass #include <sys/param.h> 35 1.1 glass #include <sys/systm.h> 36 1.1 glass #include <sys/proc.h> 37 1.1 glass #include <sys/malloc.h> 38 1.1 glass #include <sys/vnode.h> 39 1.1 glass #include <sys/exec.h> 40 1.1 glass #include <sys/resourcevar.h> 41 1.1 glass #include <vm/vm.h> 42 1.1 glass 43 1.1 glass #include <sys/exec_ecoff.h> 44 1.1 glass 45 1.2 glass int exec_ecoff_prep_omagic __P((struct proc *, struct exec_package *, 46 1.2 glass struct ecoff_filehdr *, 47 1.2 glass struct ecoff_aouthdr *)); 48 1.2 glass int exec_ecoff_prep_nmagic __P((struct proc *, struct exec_package *, 49 1.1 glass struct ecoff_filehdr *, 50 1.1 glass struct ecoff_aouthdr *)); 51 1.2 glass int exec_ecoff_prep_zmagic __P((struct proc *, struct exec_package *, 52 1.1 glass struct ecoff_filehdr *, 53 1.1 glass struct ecoff_aouthdr *)); 54 1.1 glass int exec_ecoff_setup_stack __P((struct proc *, struct exec_package *)); 55 1.1 glass 56 1.1 glass /* 57 1.1 glass * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 58 1.1 glass * 59 1.1 glass * Given a proc pointer and an exec package pointer, see if the referent 60 1.1 glass * of the epp is in ecoff format. Check 'standard' magic numbers for 61 1.1 glass * this architecture. If that fails, return failure. 62 1.1 glass * 63 1.1 glass * This function is responsible for creating a set of vmcmds which can be 64 1.1 glass * used to build the process's vm space and inserting them into the exec 65 1.1 glass * package. 66 1.1 glass */ 67 1.1 glass 68 1.1 glass int 69 1.1 glass exec_ecoff_makecmds(p, epp) 70 1.1 glass struct proc *p; 71 1.1 glass struct exec_package *epp; 72 1.1 glass { 73 1.1 glass int error; 74 1.1 glass struct ecoff_filehdr *efp = epp->ep_hdr; 75 1.1 glass struct ecoff_aouthdr *eap; 76 1.1 glass 77 1.1 glass if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 78 1.1 glass return ENOEXEC; 79 1.1 glass 80 1.1 glass if (ECOFF_BADMAG(efp)) 81 1.1 glass return ENOEXEC; 82 1.1 glass 83 1.5 cgd eap = (struct ecoff_aouthdr *) 84 1.5 cgd ((caddr_t)epp->ep_hdr + sizeof(struct ecoff_filehdr)); 85 1.1 glass switch (eap->ea_magic) { 86 1.2 glass case ECOFF_OMAGIC: 87 1.2 glass error = exec_ecoff_prep_omagic(p, epp, efp, eap); 88 1.2 glass break; 89 1.2 glass case ECOFF_NMAGIC: 90 1.2 glass error = exec_ecoff_prep_nmagic(p, epp, efp, eap); 91 1.2 glass break; 92 1.1 glass case ECOFF_ZMAGIC: 93 1.1 glass error = exec_ecoff_prep_zmagic(p, epp, efp, eap); 94 1.1 glass break; 95 1.1 glass default: 96 1.1 glass return ENOEXEC; 97 1.1 glass } 98 1.1 glass 99 1.1 glass if (error == 0) 100 1.1 glass error = cpu_exec_ecoff_hook(p, epp, eap); 101 1.1 glass 102 1.1 glass if (error) 103 1.1 glass kill_vmcmds(&epp->ep_vmcmds); 104 1.1 glass 105 1.1 glass return error; 106 1.1 glass } 107 1.1 glass 108 1.1 glass /* 109 1.2 glass * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 110 1.2 glass * executable. 111 1.1 glass * 112 1.2 glass * Note that the ep_ssize parameter must be set to be the current stack 113 1.2 glass * limit; this is adjusted in the body of execve() to yield the 114 1.2 glass * appropriate stack segment usage once the argument length is 115 1.2 glass * calculated. 116 1.1 glass * 117 1.2 glass * This function returns an int for uniformity with other (future) formats' 118 1.2 glass * stack setup functions. They might have errors to return. 119 1.1 glass */ 120 1.1 glass 121 1.2 glass int 122 1.2 glass exec_ecoff_setup_stack(p, epp) 123 1.1 glass struct proc *p; 124 1.1 glass struct exec_package *epp; 125 1.1 glass { 126 1.2 glass 127 1.2 glass epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 128 1.2 glass epp->ep_minsaddr = USRSTACK; 129 1.2 glass epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 130 1.1 glass 131 1.1 glass /* 132 1.2 glass * set up commands for stack. note that this takes *two*, one to 133 1.2 glass * map the part of the stack which we can access, and one to map 134 1.2 glass * the part which we can't. 135 1.2 glass * 136 1.2 glass * arguably, it could be made into one, but that would require the 137 1.2 glass * addition of another mapping proc, which is unnecessary 138 1.2 glass * 139 1.2 glass * note that in memory, things assumed to be: 0 ....... ep_maxsaddr 140 1.2 glass * <stack> ep_minsaddr 141 1.1 glass */ 142 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 143 1.2 glass ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 144 1.2 glass epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 145 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 146 1.2 glass (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 147 1.1 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 148 1.1 glass 149 1.2 glass return 0; 150 1.2 glass } 151 1.1 glass 152 1.1 glass 153 1.1 glass /* 154 1.1 glass * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 155 1.1 glass */ 156 1.2 glass 157 1.2 glass int 158 1.2 glass exec_ecoff_prep_omagic(p, epp, efp, eap) 159 1.1 glass struct proc *p; 160 1.1 glass struct exec_package *epp; 161 1.1 glass struct ecoff_filehdr *efp; 162 1.1 glass struct ecoff_aouthdr *eap; 163 1.1 glass { 164 1.2 glass epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 165 1.1 glass epp->ep_tsize = eap->ea_tsize; 166 1.2 glass epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 167 1.4 glass epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 168 1.1 glass epp->ep_entry = eap->ea_entry; 169 1.1 glass 170 1.1 glass /* set up command for text and data segments */ 171 1.1 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 172 1.1 glass eap->ea_tsize + eap->ea_dsize, epp->ep_taddr, epp->ep_vp, 173 1.1 glass ECOFF_TXTOFF(efp, eap), 174 1.1 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 175 1.1 glass 176 1.1 glass /* set up command for bss segment */ 177 1.1 glass if (eap->ea_bsize > 0) 178 1.1 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 179 1.2 glass ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 180 1.2 glass NULLVP, 0, 181 1.1 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 182 1.1 glass 183 1.1 glass return exec_ecoff_setup_stack(p, epp); 184 1.1 glass } 185 1.1 glass 186 1.1 glass /* 187 1.2 glass * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 188 1.2 glass * package. 189 1.2 glass */ 190 1.2 glass 191 1.2 glass int 192 1.2 glass exec_ecoff_prep_nmagic(p, epp, efp, eap) 193 1.2 glass struct proc *p; 194 1.2 glass struct exec_package *epp; 195 1.2 glass struct ecoff_filehdr *efp; 196 1.2 glass struct ecoff_aouthdr *eap; 197 1.2 glass { 198 1.2 glass epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 199 1.2 glass epp->ep_tsize = eap->ea_tsize; 200 1.2 glass epp->ep_daddr = ECOFF_ROUND(eap->ea_data_start, ECOFF_LDPGSZ); 201 1.4 glass epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 202 1.2 glass epp->ep_entry = eap->ea_entry; 203 1.2 glass 204 1.2 glass /* set up command for text segment */ 205 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 206 1.2 glass epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 207 1.2 glass VM_PROT_READ|VM_PROT_EXECUTE); 208 1.2 glass 209 1.2 glass /* set up command for data segment */ 210 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 211 1.2 glass epp->ep_daddr, epp->ep_vp, ECOFF_DATOFF(efp, eap), 212 1.2 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 213 1.2 glass 214 1.2 glass /* set up command for bss segment */ 215 1.2 glass if (eap->ea_bsize > 0) 216 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 217 1.2 glass ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 218 1.2 glass NULLVP, 0, 219 1.2 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 220 1.2 glass 221 1.2 glass return exec_ecoff_setup_stack(p, epp); 222 1.2 glass } 223 1.2 glass 224 1.2 glass /* 225 1.2 glass * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 226 1.1 glass * 227 1.2 glass * First, set the various offsets/lengths in the exec package. 228 1.1 glass * 229 1.2 glass * Then, mark the text image busy (so it can be demand paged) or error 230 1.2 glass * out if this is not possible. Finally, set up vmcmds for the 231 1.2 glass * text, data, bss, and stack segments. 232 1.1 glass */ 233 1.1 glass 234 1.1 glass int 235 1.2 glass exec_ecoff_prep_zmagic(p, epp, efp, eap) 236 1.1 glass struct proc *p; 237 1.1 glass struct exec_package *epp; 238 1.2 glass struct ecoff_filehdr *efp; 239 1.2 glass struct ecoff_aouthdr *eap; 240 1.1 glass { 241 1.2 glass epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 242 1.2 glass epp->ep_tsize = eap->ea_tsize; 243 1.2 glass epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 244 1.4 glass epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 245 1.2 glass epp->ep_entry = eap->ea_entry; 246 1.1 glass 247 1.1 glass /* 248 1.2 glass * check if vnode is in open for writing, because we want to 249 1.2 glass * demand-page out of it. if it is, don't do it, for various 250 1.2 glass * reasons 251 1.1 glass */ 252 1.2 glass if ((eap->ea_tsize != 0 || eap->ea_dsize != 0) && 253 1.2 glass epp->ep_vp->v_writecount != 0) { 254 1.2 glass #ifdef DIAGNOSTIC 255 1.2 glass if (epp->ep_vp->v_flag & VTEXT) 256 1.2 glass panic("exec: a VTEXT vnode has writecount != 0\n"); 257 1.2 glass #endif 258 1.2 glass return ETXTBSY; 259 1.2 glass } 260 1.2 glass epp->ep_vp->v_flag |= VTEXT; 261 1.2 glass 262 1.2 glass /* set up command for text segment */ 263 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_tsize, 264 1.2 glass epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 265 1.2 glass VM_PROT_READ|VM_PROT_EXECUTE); 266 1.2 glass 267 1.2 glass /* set up command for data segment */ 268 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_dsize, 269 1.2 glass epp->ep_daddr, epp->ep_vp, 270 1.2 glass ECOFF_DATOFF(efp, eap), 271 1.2 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 272 1.2 glass 273 1.2 glass /* set up command for bss segment */ 274 1.2 glass NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 275 1.2 glass ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), NULLVP, 0, 276 1.2 glass VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 277 1.1 glass 278 1.2 glass return exec_ecoff_setup_stack(p, epp); 279 1.1 glass } 280
Indexes created Tue Sep 30 11:09:46 GMT 2025