exec_ecoff.c revision 1.27
1 /* $NetBSD: exec_ecoff.c,v 1.27 2008/11/19 18:36:06 ad 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 1.27 2008/11/19 18:36:06 ad Exp $"); 37 38 #ifdef _KERNEL_OPT 39 #include "opt_coredump.h" 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/malloc.h> 46 #include <sys/vnode.h> 47 #include <sys/exec.h> 48 #include <sys/resourcevar.h> 49 #include <sys/module.h> 50 #include <sys/exec.h> 51 #include <sys/exec_ecoff.h> 52 53 #ifdef COREDUMP 54 #define DEP "coredump" 55 #else 56 #define DEP NULL 57 #endif 58 59 MODULE(MODULE_CLASS_MISC, exec_ecoff, DEP) 60 61 static const struct exec_ecoff_execsw = { 62 ECOFF_HDR_SIZE, 63 exec_ecoff_makecmds, 64 { .ecoff_probe_func = cpu_exec_ecoff_probe }, 65 &emul_netbsd, 66 EXECSW_PRIO_ANY, 67 0, 68 copyargs, 69 cpu_exec_ecoff_setregs, 70 coredump_netbsd, 71 exec_setup_stack 72 }; 73 74 static int 75 exec_ecoff_modcmd(modcmd_t cmd, void *arg) 76 { 77 int error; 78 79 switch (cmd) { 80 case MODULE_CMD_INIT: 81 return exec_add(&exec_ecoff_execsw, 1); 82 83 case MODULE_CMD_FINI: 84 return exec_remove(&exec_ecoff_execsw, 1); 85 86 default: 87 return ENOTTY; 88 } 89 } 90 91 /* 92 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 93 * 94 * Given a proc pointer and an exec package pointer, see if the referent 95 * of the epp is in ecoff format. Check 'standard' magic numbers for 96 * this architecture. If that fails, return failure. 97 * 98 * This function is responsible for creating a set of vmcmds which can be 99 * used to build the process's vm space and inserting them into the exec 100 * package. 101 */ 102 int 103 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp) 104 { 105 int error; 106 struct ecoff_exechdr *execp = epp->ep_hdr; 107 108 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 109 return ENOEXEC; 110 111 if (ECOFF_BADMAG(execp)) 112 return ENOEXEC; 113 114 error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp); 115 116 /* 117 * if there was an error or there are already vmcmds set up, 118 * we return. (the latter can happen if cpu_exec_ecoff_hook() 119 * recursively invokes check_exec() to handle loading of a 120 * dynamically linked binary's shared loader. 121 */ 122 if (error || epp->ep_vmcmds.evs_cnt) 123 return (error); 124 125 /* 126 * prepare the exec package to map the executable. 127 */ 128 switch (execp->a.magic) { 129 case ECOFF_OMAGIC: 130 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr, 131 epp->ep_vp); 132 break; 133 case ECOFF_NMAGIC: 134 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr, 135 epp->ep_vp); 136 break; 137 case ECOFF_ZMAGIC: 138 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr, 139 epp->ep_vp); 140 break; 141 default: 142 return ENOEXEC; 143 } 144 145 /* set up the stack */ 146 if (!error) 147 error = (*epp->ep_esch->es_setup_stack)(l, epp); 148 149 if (error) 150 kill_vmcmds(&epp->ep_vmcmds); 151 152 return error; 153 } 154 155 /* 156 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 157 */ 158 int 159 exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp, 160 struct ecoff_exechdr *execp, struct vnode *vp) 161 { 162 struct ecoff_aouthdr *eap = &execp->a; 163 164 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 165 epp->ep_tsize = eap->tsize; 166 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 167 epp->ep_dsize = eap->dsize + eap->bsize; 168 epp->ep_entry = eap->entry; 169 170 /* set up command for text and data segments */ 171 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 172 eap->tsize + eap->dsize, epp->ep_taddr, vp, 173 ECOFF_TXTOFF(execp), 174 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 175 176 /* set up command for bss segment */ 177 if (eap->bsize > 0) 178 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 179 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 180 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 181 182 return 0; 183 } 184 185 /* 186 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 187 * package. 188 */ 189 int 190 exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp, 191 struct ecoff_exechdr *execp, struct vnode *vp) 192 { 193 struct ecoff_aouthdr *eap = &execp->a; 194 195 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 196 epp->ep_tsize = eap->tsize; 197 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 198 epp->ep_dsize = eap->dsize + eap->bsize; 199 epp->ep_entry = eap->entry; 200 201 /* set up command for text segment */ 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 203 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 204 VM_PROT_READ|VM_PROT_EXECUTE); 205 206 /* set up command for data segment */ 207 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 208 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 209 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 210 211 /* set up command for bss segment */ 212 if (eap->bsize > 0) 213 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 214 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 215 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 216 217 return 0; 218 } 219 220 /* 221 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 222 * 223 * First, set the various offsets/lengths in the exec package. 224 * 225 * Then, mark the text image busy (so it can be demand paged) or error 226 * out if this is not possible. Finally, set up vmcmds for the 227 * text, data, bss, and stack segments. 228 */ 229 int 230 exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp, 231 struct ecoff_exechdr *execp, struct vnode *vp) 232 { 233 struct ecoff_aouthdr *eap = &execp->a; 234 int error; 235 236 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 237 epp->ep_tsize = eap->tsize; 238 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 239 epp->ep_dsize = eap->dsize + eap->bsize; 240 epp->ep_entry = eap->entry; 241 242 error = vn_marktext(vp); 243 if (error) 244 return (error); 245 246 /* set up command for text segment */ 247 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 248 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 249 VM_PROT_READ|VM_PROT_EXECUTE); 250 251 /* set up command for data segment */ 252 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 253 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 254 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 255 256 /* set up command for bss segment */ 257 if (eap->bsize > 0) 258 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 259 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 260 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 261 262 return 0; 263 } 264
Indexes created Tue Sep 23 02:09:52 GMT 2025