exec_ecoff.c revision 1.12
1 /* $NetBSD: exec_ecoff.c,v 1.12 2000/06/27 17:41:08 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Adam Glass 5 * Copyright (c) 1993, 1994, 1996, 1999 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 * for the NetBSD Project. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/vnode.h> 40 #include <sys/exec.h> 41 #include <sys/resourcevar.h> 42 43 #include <sys/exec_ecoff.h> 44 45 /* 46 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 47 * 48 * Given a proc pointer and an exec package pointer, see if the referent 49 * of the epp is in ecoff format. Check 'standard' magic numbers for 50 * this architecture. If that fails, return failure. 51 * 52 * This function is responsible for creating a set of vmcmds which can be 53 * used to build the process's vm space and inserting them into the exec 54 * package. 55 */ 56 int 57 exec_ecoff_makecmds(p, epp) 58 struct proc *p; 59 struct exec_package *epp; 60 { 61 int error; 62 struct ecoff_exechdr *execp = epp->ep_hdr; 63 64 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 65 return ENOEXEC; 66 67 if (ECOFF_BADMAG(execp)) 68 return ENOEXEC; 69 70 error = cpu_exec_ecoff_hook(p, epp); 71 72 /* 73 * if there was an error or there are already vmcmds set up, 74 * we return. (the latter can happen if cpu_exec_ecoff_hook() 75 * recursively invokes check_exec() to handle loading of a 76 * dynamically linked binary's shared loader. 77 */ 78 if (error || epp->ep_vmcmds.evs_cnt) 79 return (error); 80 81 /* 82 * prepare the exec package to map the executable. 83 */ 84 switch (execp->a.magic) { 85 case ECOFF_OMAGIC: 86 error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr, 87 epp->ep_vp); 88 break; 89 case ECOFF_NMAGIC: 90 error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, 91 epp->ep_vp); 92 break; 93 case ECOFF_ZMAGIC: 94 error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr, 95 epp->ep_vp); 96 break; 97 default: 98 return ENOEXEC; 99 } 100 101 /* set up the stack */ 102 if (!error) 103 error = exec_ecoff_setup_stack(p, epp); 104 105 if (error) 106 kill_vmcmds(&epp->ep_vmcmds); 107 108 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 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 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 156 */ 157 int 158 exec_ecoff_prep_omagic(p, epp, execp, vp) 159 struct proc *p; 160 struct exec_package *epp; 161 struct ecoff_exechdr *execp; 162 struct vnode *vp; 163 { 164 struct ecoff_aouthdr *eap = &execp->a; 165 166 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 167 epp->ep_tsize = eap->tsize; 168 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 169 epp->ep_dsize = eap->dsize + eap->bsize; 170 epp->ep_entry = eap->entry; 171 172 /* set up command for text and data segments */ 173 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 174 eap->tsize + eap->dsize, epp->ep_taddr, vp, 175 ECOFF_TXTOFF(execp), 176 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 177 178 /* set up command for bss segment */ 179 if (eap->bsize > 0) 180 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 181 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 182 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 183 184 return 0; 185 } 186 187 /* 188 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 189 * package. 190 */ 191 int 192 exec_ecoff_prep_nmagic(p, epp, execp, vp) 193 struct proc *p; 194 struct exec_package *epp; 195 struct ecoff_exechdr *execp; 196 struct vnode *vp; 197 { 198 struct ecoff_aouthdr *eap = &execp->a; 199 200 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 201 epp->ep_tsize = eap->tsize; 202 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 203 epp->ep_dsize = eap->dsize + eap->bsize; 204 epp->ep_entry = eap->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, vp, ECOFF_TXTOFF(execp), 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, vp, ECOFF_DATOFF(execp), 214 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 215 216 /* set up command for bss segment */ 217 if (eap->bsize > 0) 218 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 219 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 220 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 221 222 return 0; 223 } 224 225 /* 226 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 227 * 228 * First, set the various offsets/lengths in the exec package. 229 * 230 * Then, mark the text image busy (so it can be demand paged) or error 231 * out if this is not possible. Finally, set up vmcmds for the 232 * text, data, bss, and stack segments. 233 */ 234 int 235 exec_ecoff_prep_zmagic(p, epp, execp, vp) 236 struct proc *p; 237 struct exec_package *epp; 238 struct ecoff_exechdr *execp; 239 struct vnode *vp; 240 { 241 struct ecoff_aouthdr *eap = &execp->a; 242 243 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 244 epp->ep_tsize = eap->tsize; 245 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 246 epp->ep_dsize = eap->dsize + eap->bsize; 247 epp->ep_entry = eap->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->tsize != 0 || eap->dsize != 0) && 255 vp->v_writecount != 0) { 256 #ifdef DIAGNOSTIC 257 if (vp->v_flag & VTEXT) 258 panic("exec: a VTEXT vnode has writecount != 0\n"); 259 #endif 260 return ETXTBSY; 261 } 262 vn_marktext(vp); 263 264 /* set up command for text segment */ 265 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 266 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 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->dsize, 271 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 272 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 273 274 /* set up command for bss segment */ 275 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 276 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 277 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 278 279 return 0; 280 } 281
Indexes created Mon Sep 29 03:10:08 GMT 2025