exec_ecoff.c revision 1.22
1 /* $NetBSD: exec_ecoff.c,v 1.22 2003/06/29 22:31:16 fvdl 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 1.22 2003/06/29 22:31:16 fvdl 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 proc *p, struct exec_package *epp) 61 { 62 int error; 63 struct ecoff_exechdr *execp = epp->ep_hdr; 64 65 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 66 return ENOEXEC; 67 68 if (ECOFF_BADMAG(execp)) 69 return ENOEXEC; 70 71 error = (*epp->ep_esch->u.ecoff_probe_func)(p, epp); 72 73 /* 74 * if there was an error or there are already vmcmds set up, 75 * we return. (the latter can happen if cpu_exec_ecoff_hook() 76 * recursively invokes check_exec() to handle loading of a 77 * dynamically linked binary's shared loader. 78 */ 79 if (error || epp->ep_vmcmds.evs_cnt) 80 return (error); 81 82 /* 83 * prepare the exec package to map the executable. 84 */ 85 switch (execp->a.magic) { 86 case ECOFF_OMAGIC: 87 error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr, 88 epp->ep_vp); 89 break; 90 case ECOFF_NMAGIC: 91 error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, 92 epp->ep_vp); 93 break; 94 case ECOFF_ZMAGIC: 95 error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr, 96 epp->ep_vp); 97 break; 98 default: 99 return ENOEXEC; 100 } 101 102 /* set up the stack */ 103 if (!error) 104 error = exec_ecoff_setup_stack(p, epp); 105 106 if (error) 107 kill_vmcmds(&epp->ep_vmcmds); 108 109 return error; 110 } 111 112 /* 113 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 114 * executable. 115 * 116 * Note that the ep_ssize parameter must be set to be the current stack 117 * limit; this is adjusted in the body of execve() to yield the 118 * appropriate stack segment usage once the argument length is 119 * calculated. 120 * 121 * This function returns an int for uniformity with other (future) formats' 122 * stack setup functions. They might have errors to return. 123 */ 124 int 125 exec_ecoff_setup_stack(struct proc *p, struct exec_package *epp) 126 { 127 128 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 129 epp->ep_minsaddr = USRSTACK; 130 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 131 132 /* 133 * set up commands for stack. note that this takes *two*, one to 134 * map the part of the stack which we can access, and one to map 135 * the part which we can't. 136 * 137 * arguably, it could be made into one, but that would require the 138 * addition of another mapping proc, which is unnecessary 139 * 140 * note that in memory, things assumed to be: 0 ... ep_maxsaddr 141 * <stack> ep_minsaddr 142 */ 143 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 144 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 145 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 146 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 147 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 148 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 149 150 return 0; 151 } 152 153 /* 154 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 155 */ 156 int 157 exec_ecoff_prep_omagic(struct proc *p, struct exec_package *epp, 158 struct ecoff_exechdr *execp, struct vnode *vp) 159 { 160 struct ecoff_aouthdr *eap = &execp->a; 161 162 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 163 epp->ep_tsize = eap->tsize; 164 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 165 epp->ep_dsize = eap->dsize + eap->bsize; 166 epp->ep_entry = eap->entry; 167 168 /* set up command for text and data segments */ 169 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 170 eap->tsize + eap->dsize, epp->ep_taddr, vp, 171 ECOFF_TXTOFF(execp), 172 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 173 174 /* set up command for bss segment */ 175 if (eap->bsize > 0) 176 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 177 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 178 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 179 180 return 0; 181 } 182 183 /* 184 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 185 * package. 186 */ 187 int 188 exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp, 189 struct ecoff_exechdr *execp, struct vnode *vp) 190 { 191 struct ecoff_aouthdr *eap = &execp->a; 192 193 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 194 epp->ep_tsize = eap->tsize; 195 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 196 epp->ep_dsize = eap->dsize + eap->bsize; 197 epp->ep_entry = eap->entry; 198 199 /* set up command for text segment */ 200 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 201 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 202 VM_PROT_READ|VM_PROT_EXECUTE); 203 204 /* set up command for data segment */ 205 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 206 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 207 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 208 209 /* set up command for bss segment */ 210 if (eap->bsize > 0) 211 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 212 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 213 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 214 215 return 0; 216 } 217 218 /* 219 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 220 * 221 * First, set the various offsets/lengths in the exec package. 222 * 223 * Then, mark the text image busy (so it can be demand paged) or error 224 * out if this is not possible. Finally, set up vmcmds for the 225 * text, data, bss, and stack segments. 226 */ 227 int 228 exec_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp, 229 struct ecoff_exechdr *execp, struct vnode *vp) 230 { 231 struct ecoff_aouthdr *eap = &execp->a; 232 int error; 233 234 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 235 epp->ep_tsize = eap->tsize; 236 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 237 epp->ep_dsize = eap->dsize + eap->bsize; 238 epp->ep_entry = eap->entry; 239 240 error = vn_marktext(vp); 241 if (error) 242 return (error); 243 244 /* set up command for text segment */ 245 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 246 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 247 VM_PROT_READ|VM_PROT_EXECUTE); 248 249 /* set up command for data segment */ 250 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 251 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 252 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 253 254 /* set up command for bss segment */ 255 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 256 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 257 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 258 259 return 0; 260 } 261
Indexes created Tue Sep 23 21:09:50 GMT 2025