exec_ecoff.c revision 1.32
1 /* $NetBSD: exec_ecoff.c,v 1.32 2019/11/20 19:37:53 pgoyette 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 1.32 2019/11/20 19:37:53 pgoyette Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/exec.h> 43 #include <sys/resourcevar.h> 44 #include <sys/module.h> 45 #include <sys/exec.h> 46 #include <sys/exec_ecoff.h> 47 48 MODULE(MODULE_CLASS_EXEC, exec_ecoff, NULL); 49 50 static struct execsw exec_ecoff_execsw = { 51 .es_hdrsz = ECOFF_HDR_SIZE, 52 .es_makecmds = exec_ecoff_makecmds, 53 .u = { 54 .ecoff_probe_func = cpu_exec_ecoff_probe, 55 }, 56 .es_emul = &emul_netbsd, 57 .es_prio = EXECSW_PRIO_ANY, 58 .es_arglen = 0, 59 .es_copyargs = copyargs, 60 .es_setregs = cpu_exec_ecoff_setregs, 61 .es_coredump = coredump_netbsd, 62 .es_setup_stack = exec_setup_stack, 63 }; 64 65 static int 66 exec_ecoff_modcmd(modcmd_t cmd, void *arg) 67 { 68 switch (cmd) { 69 case MODULE_CMD_INIT: 70 return exec_add(&exec_ecoff_execsw, 1); 71 72 case MODULE_CMD_FINI: 73 return exec_remove(&exec_ecoff_execsw, 1); 74 75 default: 76 return ENOTTY; 77 } 78 } 79 80 /* 81 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 82 * 83 * Given a proc pointer and an exec package pointer, see if the referent 84 * of the epp is in ecoff format. Check 'standard' magic numbers for 85 * this architecture. If that fails, return failure. 86 * 87 * This function is responsible for creating a set of vmcmds which can be 88 * used to build the process's vm space and inserting them into the exec 89 * package. 90 */ 91 int 92 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp) 93 { 94 int error; 95 struct ecoff_exechdr *execp = epp->ep_hdr; 96 97 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 98 return ENOEXEC; 99 100 if (ECOFF_BADMAG(execp)) 101 return ENOEXEC; 102 103 error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp); 104 105 /* 106 * if there was an error or there are already vmcmds set up, 107 * we return. (the latter can happen if cpu_exec_ecoff_hook() 108 * recursively invokes check_exec() to handle loading of a 109 * dynamically linked binary's shared loader. 110 */ 111 if (error || epp->ep_vmcmds.evs_cnt) 112 return (error); 113 114 /* 115 * prepare the exec package to map the executable. 116 */ 117 switch (execp->a.magic) { 118 case ECOFF_OMAGIC: 119 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr, 120 epp->ep_vp); 121 break; 122 case ECOFF_NMAGIC: 123 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr, 124 epp->ep_vp); 125 break; 126 case ECOFF_ZMAGIC: 127 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr, 128 epp->ep_vp); 129 break; 130 default: 131 return ENOEXEC; 132 } 133 134 /* set up the stack */ 135 if (!error) 136 error = (*epp->ep_esch->es_setup_stack)(l, epp); 137 138 if (error) 139 kill_vmcmds(&epp->ep_vmcmds); 140 141 return error; 142 } 143 144 /* 145 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 146 */ 147 int 148 exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp, 149 struct ecoff_exechdr *execp, struct vnode *vp) 150 { 151 struct ecoff_aouthdr *eap = &execp->a; 152 153 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 154 epp->ep_tsize = eap->tsize; 155 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 156 epp->ep_dsize = eap->dsize + eap->bsize; 157 epp->ep_entry = eap->entry; 158 159 /* set up command for text and data segments */ 160 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 161 eap->tsize + eap->dsize, epp->ep_taddr, vp, 162 ECOFF_TXTOFF(execp), 163 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 164 165 /* set up command for bss segment */ 166 if (eap->bsize > 0) 167 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 168 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 169 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 170 171 return 0; 172 } 173 174 /* 175 * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec 176 * package. 177 */ 178 int 179 exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp, 180 struct ecoff_exechdr *execp, struct vnode *vp) 181 { 182 struct ecoff_aouthdr *eap = &execp->a; 183 184 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 185 epp->ep_tsize = eap->tsize; 186 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 187 epp->ep_dsize = eap->dsize + eap->bsize; 188 epp->ep_entry = eap->entry; 189 190 /* set up command for text segment */ 191 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 192 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 193 VM_PROT_READ|VM_PROT_EXECUTE); 194 195 /* set up command for data segment */ 196 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 197 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 198 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 199 200 /* set up command for bss segment */ 201 if (eap->bsize > 0) 202 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 203 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 204 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 205 206 return 0; 207 } 208 209 /* 210 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 211 * 212 * First, set the various offsets/lengths in the exec package. 213 * 214 * Then, mark the text image busy (so it can be demand paged) or error 215 * out if this is not possible. Finally, set up vmcmds for the 216 * text, data, bss, and stack segments. 217 */ 218 int 219 exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp, 220 struct ecoff_exechdr *execp, struct vnode *vp) 221 { 222 struct ecoff_aouthdr *eap = &execp->a; 223 int error; 224 225 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 226 epp->ep_tsize = eap->tsize; 227 epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start); 228 epp->ep_dsize = eap->dsize + eap->bsize; 229 epp->ep_entry = eap->entry; 230 231 error = vn_marktext(vp); 232 if (error) 233 return (error); 234 235 /* set up command for text segment */ 236 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 237 epp->ep_taddr, vp, ECOFF_TXTOFF(execp), 238 VM_PROT_READ|VM_PROT_EXECUTE); 239 240 /* set up command for data segment */ 241 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize, 242 epp->ep_daddr, vp, ECOFF_DATOFF(execp), 243 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 244 245 /* set up command for bss segment */ 246 if (eap->bsize > 0) 247 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 248 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 249 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 250 251 return 0; 252 } 253
Indexes created Thu Sep 25 08:09:54 GMT 2025