exec_ecoff.c revision 1.20
1 /* $NetBSD: exec_ecoff.c,v 1.20 2003/06/28 14:21:51 darrenr 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/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.20 2003/06/28 14:21:51 darrenr Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/malloc.h> 42 #include <sys/vnode.h> 43 #include <sys/exec.h> 44 #include <sys/resourcevar.h> 45 46 #include <sys/exec_ecoff.h> 47 48 /* 49 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 50 * 51 * Given a proc pointer and an exec package pointer, see if the referent 52 * of the epp is in ecoff format. Check 'standard' magic numbers for 53 * this architecture. If that fails, return failure. 54 * 55 * This function is responsible for creating a set of vmcmds which can be 56 * used to build the process's vm space and inserting them into the exec 57 * package. 58 */ 59 int 60 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp) 61 { 62 int error; 63 struct ecoff_exechdr *execp = epp->ep_hdr; 64 struct proc *p = l->l_proc; 65 66 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 67 return ENOEXEC; 68 69 if (ECOFF_BADMAG(execp)) 70 return ENOEXEC; 71 72 error = (*epp->ep_esch->u.ecoff_probe_func)(p, epp); 73 74 /* 75 * if there was an error or there are already vmcmds set up, 76 * we return. (the latter can happen if cpu_exec_ecoff_hook() 77 * recursively invokes check_exec() to handle loading of a 78 * dynamically linked binary's shared loader. 79 */ 80 if (error || epp->ep_vmcmds.evs_cnt) 81 return (error); 82 83 /* 84 * prepare the exec package to map the executable. 85 */ 86 switch (execp->a.magic) { 87 case ECOFF_OMAGIC: 88 error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr, 89 epp->ep_vp); 90 break; 91 case ECOFF_NMAGIC: 92 error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, 93 epp->ep_vp); 94 break; 95 case ECOFF_ZMAGIC: 96 error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr, 97 epp->ep_vp); 98 break; 99 default: 100 return ENOEXEC; 101 } 102 103 /* set up the stack */ 104 if (!error) 105 error = exec_ecoff_setup_stack(p, epp); 106 107 if (error) 108 kill_vmcmds(&epp->ep_vmcmds); 109 110 return error; 111 } 112 113 /* 114 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 115 * executable. 116 * 117 * Note that the ep_ssize parameter must be set to be the current stack 118 * limit; this is adjusted in the body of execve() to yield the 119 * appropriate stack segment usage once the argument length is 120 * calculated. 121 * 122 * This function returns an int for uniformity with other (future) formats' 123 * stack setup functions. They might have errors to return. 124 */ 125 int 126 exec_ecoff_setup_stack(struct proc *p, 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(struct proc *p, struct exec_package *epp, 159 struct ecoff_exechdr *execp, struct vnode *vp) 160 { 161 struct ecoff_aouthdr *eap = &execp->a; 162 163 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 164 epp->ep_tsize = eap->tsize; 165 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 166 epp->ep_dsize = eap->dsize + eap->bsize; 167 epp->ep_entry = eap->entry; 168 169 /* set up command for text and data segments */ 170 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 171 eap->tsize + eap->dsize, epp->ep_taddr, vp, 172 ECOFF_TXTOFF(execp), 173 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 174 175 /* set up command for bss segment */ 176 if (eap->bsize > 0) 177 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 178 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 179 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 180 181 return 0; 182 } 183 184 /* 185 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 186 * package. 187 */ 188 int 189 exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp, 190 struct ecoff_exechdr *execp, struct vnode *vp) 191 { 192 struct ecoff_aouthdr *eap = &execp->a; 193 194 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 195 epp->ep_tsize = eap->tsize; 196 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 197 epp->ep_dsize = eap->dsize + eap->bsize; 198 epp->ep_entry = eap->entry; 199 200 /* set up command for text segment */ 201 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 202 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 203 VM_PROT_READ|VM_PROT_EXECUTE); 204 205 /* set up command for data segment */ 206 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 207 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 208 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 209 210 /* set up command for bss segment */ 211 if (eap->bsize > 0) 212 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 213 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 214 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 215 216 return 0; 217 } 218 219 /* 220 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 221 * 222 * First, set the various offsets/lengths in the exec package. 223 * 224 * Then, mark the text image busy (so it can be demand paged) or error 225 * out if this is not possible. Finally, set up vmcmds for the 226 * text, data, bss, and stack segments. 227 */ 228 int 229 exec_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp, 230 struct ecoff_exechdr *execp, struct vnode *vp) 231 { 232 struct ecoff_aouthdr *eap = &execp->a; 233 int error; 234 235 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 236 epp->ep_tsize = eap->tsize; 237 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 238 epp->ep_dsize = eap->dsize + eap->bsize; 239 epp->ep_entry = eap->entry; 240 241 error = vn_marktext(vp); 242 if (error) 243 return (error); 244 245 /* set up command for text segment */ 246 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 247 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 248 VM_PROT_READ|VM_PROT_EXECUTE); 249 250 /* set up command for data segment */ 251 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 252 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 253 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 254 255 /* set up command for bss segment */ 256 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 257 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 258 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 259 260 return 0; 261 } 262
Indexes created Mon Sep 29 03:10:08 GMT 2025