exec_ecoff.c revision 1.13
1 /* $NetBSD: exec_ecoff.c,v 1.13 2000/08/01 04:57:28 thorpej 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(struct proc *p, struct exec_package *epp) 58 { 59 int error; 60 struct ecoff_exechdr *execp = epp->ep_hdr; 61 62 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 63 return ENOEXEC; 64 65 if (ECOFF_BADMAG(execp)) 66 return ENOEXEC; 67 68 error = cpu_exec_ecoff_hook(p, epp); 69 70 /* 71 * if there was an error or there are already vmcmds set up, 72 * we return. (the latter can happen if cpu_exec_ecoff_hook() 73 * recursively invokes check_exec() to handle loading of a 74 * dynamically linked binary's shared loader. 75 */ 76 if (error || epp->ep_vmcmds.evs_cnt) 77 return (error); 78 79 /* 80 * prepare the exec package to map the executable. 81 */ 82 switch (execp->a.magic) { 83 case ECOFF_OMAGIC: 84 error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr, 85 epp->ep_vp); 86 break; 87 case ECOFF_NMAGIC: 88 error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, 89 epp->ep_vp); 90 break; 91 case ECOFF_ZMAGIC: 92 error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr, 93 epp->ep_vp); 94 break; 95 default: 96 return ENOEXEC; 97 } 98 99 /* set up the stack */ 100 if (!error) 101 error = exec_ecoff_setup_stack(p, epp); 102 103 if (error) 104 kill_vmcmds(&epp->ep_vmcmds); 105 106 return error; 107 } 108 109 /* 110 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 111 * executable. 112 * 113 * Note that the ep_ssize parameter must be set to be the current stack 114 * limit; this is adjusted in the body of execve() to yield the 115 * appropriate stack segment usage once the argument length is 116 * calculated. 117 * 118 * This function returns an int for uniformity with other (future) formats' 119 * stack setup functions. They might have errors to return. 120 */ 121 int 122 exec_ecoff_setup_stack(struct proc *p, struct exec_package *epp) 123 { 124 125 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 126 epp->ep_minsaddr = USRSTACK; 127 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 128 129 /* 130 * set up commands for stack. note that this takes *two*, one to 131 * map the part of the stack which we can access, and one to map 132 * the part which we can't. 133 * 134 * arguably, it could be made into one, but that would require the 135 * addition of another mapping proc, which is unnecessary 136 * 137 * note that in memory, things assumed to be: 0 ... ep_maxsaddr 138 * <stack> ep_minsaddr 139 */ 140 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 141 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 142 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 143 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 144 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 145 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 146 147 return 0; 148 } 149 150 /* 151 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 152 */ 153 int 154 exec_ecoff_prep_omagic(struct proc *p, struct exec_package *epp, 155 struct ecoff_exechdr *execp, struct vnode *vp) 156 { 157 struct ecoff_aouthdr *eap = &execp->a; 158 159 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 160 epp->ep_tsize = eap->tsize; 161 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 162 epp->ep_dsize = eap->dsize + eap->bsize; 163 epp->ep_entry = eap->entry; 164 165 /* set up command for text and data segments */ 166 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 167 eap->tsize + eap->dsize, epp->ep_taddr, vp, 168 ECOFF_TXTOFF(execp), 169 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 170 171 /* set up command for bss segment */ 172 if (eap->bsize > 0) 173 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 174 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 175 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 176 177 return 0; 178 } 179 180 /* 181 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 182 * package. 183 */ 184 int 185 exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp, 186 struct ecoff_exechdr *execp, struct vnode *vp) 187 { 188 struct ecoff_aouthdr *eap = &execp->a; 189 190 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 191 epp->ep_tsize = eap->tsize; 192 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 193 epp->ep_dsize = eap->dsize + eap->bsize; 194 epp->ep_entry = eap->entry; 195 196 /* set up command for text segment */ 197 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 198 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 199 VM_PROT_READ|VM_PROT_EXECUTE); 200 201 /* set up command for data segment */ 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 203 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 204 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 205 206 /* set up command for bss segment */ 207 if (eap->bsize > 0) 208 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 209 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 210 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 211 212 return 0; 213 } 214 215 /* 216 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 217 * 218 * First, set the various offsets/lengths in the exec package. 219 * 220 * Then, mark the text image busy (so it can be demand paged) or error 221 * out if this is not possible. Finally, set up vmcmds for the 222 * text, data, bss, and stack segments. 223 */ 224 int 225 exec_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp, 226 struct ecoff_exechdr *execp, struct vnode *vp) 227 { 228 struct ecoff_aouthdr *eap = &execp->a; 229 230 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 231 epp->ep_tsize = eap->tsize; 232 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 233 epp->ep_dsize = eap->dsize + eap->bsize; 234 epp->ep_entry = eap->entry; 235 236 /* 237 * check if vnode is in open for writing, because we want to 238 * demand-page out of it. if it is, don't do it, for various 239 * reasons 240 */ 241 if ((eap->tsize != 0 || eap->dsize != 0) && 242 vp->v_writecount != 0) { 243 #ifdef DIAGNOSTIC 244 if (vp->v_flag & VTEXT) 245 panic("exec: a VTEXT vnode has writecount != 0\n"); 246 #endif 247 return ETXTBSY; 248 } 249 vn_marktext(vp); 250 251 /* set up command for text segment */ 252 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 253 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 254 VM_PROT_READ|VM_PROT_EXECUTE); 255 256 /* set up command for data segment */ 257 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 258 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 259 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 260 261 /* set up command for bss segment */ 262 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 263 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 264 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 265 266 return 0; 267 } 268
Indexes created Wed Sep 24 05:09:52 GMT 2025