exec_ecoff.c revision 1.6
1 /* $NetBSD: exec_ecoff.c,v 1.6 1996/03/07 14:31:16 christos 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 int error; 74 struct ecoff_filehdr *efp = epp->ep_hdr; 75 struct ecoff_aouthdr *eap; 76 77 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 78 return ENOEXEC; 79 80 if (ECOFF_BADMAG(efp)) 81 return ENOEXEC; 82 83 eap = (struct ecoff_aouthdr *) 84 ((caddr_t)epp->ep_hdr + sizeof(struct ecoff_filehdr)); 85 switch (eap->ea_magic) { 86 case ECOFF_OMAGIC: 87 error = exec_ecoff_prep_omagic(p, epp, efp, eap); 88 break; 89 case ECOFF_NMAGIC: 90 error = exec_ecoff_prep_nmagic(p, epp, efp, eap); 91 break; 92 case ECOFF_ZMAGIC: 93 error = exec_ecoff_prep_zmagic(p, epp, efp, eap); 94 break; 95 default: 96 return ENOEXEC; 97 } 98 99 if (error == 0) 100 error = cpu_exec_ecoff_hook(p, epp, eap); 101 102 if (error) 103 kill_vmcmds(&epp->ep_vmcmds); 104 105 return error; 106 } 107 108 /* 109 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 110 * executable. 111 * 112 * Note that the ep_ssize parameter must be set to be the current stack 113 * limit; this is adjusted in the body of execve() to yield the 114 * appropriate stack segment usage once the argument length is 115 * calculated. 116 * 117 * This function returns an int for uniformity with other (future) formats' 118 * stack setup functions. They might have errors to return. 119 */ 120 121 int 122 exec_ecoff_setup_stack(p, epp) 123 struct proc *p; 124 struct exec_package *epp; 125 { 126 127 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 128 epp->ep_minsaddr = USRSTACK; 129 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 130 131 /* 132 * set up commands for stack. note that this takes *two*, one to 133 * map the part of the stack which we can access, and one to map 134 * the part which we can't. 135 * 136 * arguably, it could be made into one, but that would require the 137 * addition of another mapping proc, which is unnecessary 138 * 139 * note that in memory, things assumed to be: 0 ....... ep_maxsaddr 140 * <stack> ep_minsaddr 141 */ 142 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 143 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 144 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 145 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 146 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 147 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 148 149 return 0; 150 } 151 152 153 /* 154 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 155 */ 156 157 int 158 exec_ecoff_prep_omagic(p, epp, efp, eap) 159 struct proc *p; 160 struct exec_package *epp; 161 struct ecoff_filehdr *efp; 162 struct ecoff_aouthdr *eap; 163 { 164 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 165 epp->ep_tsize = eap->ea_tsize; 166 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 167 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 168 epp->ep_entry = eap->ea_entry; 169 170 /* set up command for text and data segments */ 171 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 172 eap->ea_tsize + eap->ea_dsize, epp->ep_taddr, epp->ep_vp, 173 ECOFF_TXTOFF(efp, eap), 174 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 175 176 /* set up command for bss segment */ 177 if (eap->ea_bsize > 0) 178 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 179 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 180 NULLVP, 0, 181 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 182 183 return exec_ecoff_setup_stack(p, epp); 184 } 185 186 /* 187 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 188 * package. 189 */ 190 191 int 192 exec_ecoff_prep_nmagic(p, epp, efp, eap) 193 struct proc *p; 194 struct exec_package *epp; 195 struct ecoff_filehdr *efp; 196 struct ecoff_aouthdr *eap; 197 { 198 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 199 epp->ep_tsize = eap->ea_tsize; 200 epp->ep_daddr = ECOFF_ROUND(eap->ea_data_start, ECOFF_LDPGSZ); 201 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 202 epp->ep_entry = eap->ea_entry; 203 204 /* set up command for text segment */ 205 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 206 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 207 VM_PROT_READ|VM_PROT_EXECUTE); 208 209 /* set up command for data segment */ 210 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 211 epp->ep_daddr, epp->ep_vp, ECOFF_DATOFF(efp, eap), 212 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 213 214 /* set up command for bss segment */ 215 if (eap->ea_bsize > 0) 216 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 217 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), 218 NULLVP, 0, 219 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 220 221 return exec_ecoff_setup_stack(p, epp); 222 } 223 224 /* 225 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 226 * 227 * First, set the various offsets/lengths in the exec package. 228 * 229 * Then, mark the text image busy (so it can be demand paged) or error 230 * out if this is not possible. Finally, set up vmcmds for the 231 * text, data, bss, and stack segments. 232 */ 233 234 int 235 exec_ecoff_prep_zmagic(p, epp, efp, eap) 236 struct proc *p; 237 struct exec_package *epp; 238 struct ecoff_filehdr *efp; 239 struct ecoff_aouthdr *eap; 240 { 241 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_text_start); 242 epp->ep_tsize = eap->ea_tsize; 243 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(eap, eap->ea_data_start); 244 epp->ep_dsize = eap->ea_dsize + eap->ea_bsize; 245 epp->ep_entry = eap->ea_entry; 246 247 /* 248 * check if vnode is in open for writing, because we want to 249 * demand-page out of it. if it is, don't do it, for various 250 * reasons 251 */ 252 if ((eap->ea_tsize != 0 || eap->ea_dsize != 0) && 253 epp->ep_vp->v_writecount != 0) { 254 #ifdef DIAGNOSTIC 255 if (epp->ep_vp->v_flag & VTEXT) 256 panic("exec: a VTEXT vnode has writecount != 0\n"); 257 #endif 258 return ETXTBSY; 259 } 260 epp->ep_vp->v_flag |= VTEXT; 261 262 /* set up command for text segment */ 263 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_tsize, 264 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(efp, eap), 265 VM_PROT_READ|VM_PROT_EXECUTE); 266 267 /* set up command for data segment */ 268 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->ea_dsize, 269 epp->ep_daddr, epp->ep_vp, 270 ECOFF_DATOFF(efp, eap), 271 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 272 273 /* set up command for bss segment */ 274 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->ea_bsize, 275 ECOFF_SEGMENT_ALIGN(eap, eap->ea_bss_start), NULLVP, 0, 276 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 277 278 return exec_ecoff_setup_stack(p, epp); 279 } 280
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