exec_ecoff.c revision 1.7
1 /* $NetBSD: exec_ecoff.c,v 1.7 1996/05/09 23:44:44 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1994 Adam Glass 5 * Copyright (c) 1993, 1994, 1996 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 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/malloc.h> 38 #include <sys/vnode.h> 39 #include <sys/exec.h> 40 #include <sys/resourcevar.h> 41 #include <vm/vm.h> 42 43 #include <sys/exec_ecoff.h> 44 45 int exec_ecoff_prep_omagic __P((struct proc *, struct exec_package *)); 46 int exec_ecoff_prep_nmagic __P((struct proc *, struct exec_package *)); 47 int exec_ecoff_prep_zmagic __P((struct proc *, struct exec_package *)); 48 int exec_ecoff_setup_stack __P((struct proc *, struct exec_package *)); 49 50 /* 51 * exec_ecoff_makecmds(): Check if it's an ecoff-format executable. 52 * 53 * Given a proc pointer and an exec package pointer, see if the referent 54 * of the epp is in ecoff format. Check 'standard' magic numbers for 55 * this architecture. If that fails, return failure. 56 * 57 * This function is responsible for creating a set of vmcmds which can be 58 * used to build the process's vm space and inserting them into the exec 59 * package. 60 */ 61 int 62 exec_ecoff_makecmds(p, epp) 63 struct proc *p; 64 struct exec_package *epp; 65 { 66 int error; 67 struct ecoff_exechdr *execp = epp->ep_hdr; 68 69 if (epp->ep_hdrvalid < ECOFF_HDR_SIZE) 70 return ENOEXEC; 71 72 if (ECOFF_BADMAG(execp)) 73 return ENOEXEC; 74 75 switch (execp->a.magic) { 76 case ECOFF_OMAGIC: 77 error = exec_ecoff_prep_omagic(p, epp); 78 break; 79 case ECOFF_NMAGIC: 80 error = exec_ecoff_prep_nmagic(p, epp); 81 break; 82 case ECOFF_ZMAGIC: 83 error = exec_ecoff_prep_zmagic(p, epp); 84 break; 85 default: 86 return ENOEXEC; 87 } 88 89 if (error == 0) 90 error = cpu_exec_ecoff_hook(p, epp); 91 92 if (error) 93 kill_vmcmds(&epp->ep_vmcmds); 94 95 return error; 96 } 97 98 /* 99 * exec_ecoff_setup_stack(): Set up the stack segment for an ecoff 100 * executable. 101 * 102 * Note that the ep_ssize parameter must be set to be the current stack 103 * limit; this is adjusted in the body of execve() to yield the 104 * appropriate stack segment usage once the argument length is 105 * calculated. 106 * 107 * This function returns an int for uniformity with other (future) formats' 108 * stack setup functions. They might have errors to return. 109 */ 110 int 111 exec_ecoff_setup_stack(p, epp) 112 struct proc *p; 113 struct exec_package *epp; 114 { 115 116 epp->ep_maxsaddr = USRSTACK - MAXSSIZ; 117 epp->ep_minsaddr = USRSTACK; 118 epp->ep_ssize = p->p_rlimit[RLIMIT_STACK].rlim_cur; 119 120 /* 121 * set up commands for stack. note that this takes *two*, one to 122 * map the part of the stack which we can access, and one to map 123 * the part which we can't. 124 * 125 * arguably, it could be made into one, but that would require the 126 * addition of another mapping proc, which is unnecessary 127 * 128 * note that in memory, things assumed to be: 0 ....... ep_maxsaddr 129 * <stack> ep_minsaddr 130 */ 131 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, 132 ((epp->ep_minsaddr - epp->ep_ssize) - epp->ep_maxsaddr), 133 epp->ep_maxsaddr, NULLVP, 0, VM_PROT_NONE); 134 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, epp->ep_ssize, 135 (epp->ep_minsaddr - epp->ep_ssize), NULLVP, 0, 136 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 137 138 return 0; 139 } 140 141 /* 142 * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package 143 */ 144 int 145 exec_ecoff_prep_omagic(p, epp) 146 struct proc *p; 147 struct exec_package *epp; 148 { 149 struct ecoff_exechdr *execp = epp->ep_hdr; 150 struct ecoff_filehdr *efp = &execp->f; 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, epp->ep_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 exec_ecoff_setup_stack(p, epp); 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(p, epp) 180 struct proc *p; 181 struct exec_package *epp; 182 { 183 struct ecoff_exechdr *execp = epp->ep_hdr; 184 struct ecoff_filehdr *efp = &execp->f; 185 struct ecoff_aouthdr *eap = &execp->a; 186 187 epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start); 188 epp->ep_tsize = eap->tsize; 189 epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ); 190 epp->ep_dsize = eap->dsize + eap->bsize; 191 epp->ep_entry = eap->entry; 192 193 /* set up command for text segment */ 194 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize, 195 epp->ep_taddr, epp->ep_vp, ECOFF_TXTOFF(execp), 196 VM_PROT_READ|VM_PROT_EXECUTE); 197 198 /* set up command for data segment */ 199 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize, 200 epp->ep_daddr, epp->ep_vp, ECOFF_DATOFF(execp), 201 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 202 203 /* set up command for bss segment */ 204 if (eap->bsize > 0) 205 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize, 206 ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0, 207 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 208 209 return exec_ecoff_setup_stack(p, epp); 210 } 211 212 /* 213 * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package 214 * 215 * First, set the various offsets/lengths in the exec package. 216 * 217 * Then, mark the text image busy (so it can be demand paged) or error 218 * out if this is not possible. Finally, set up vmcmds for the 219 * text, data, bss, and stack segments. 220 */ 221 int 222 exec_ecoff_prep_zmagic(p, epp) 223 struct proc *p; 224 struct exec_package *epp; 225 { 226 struct ecoff_exechdr *execp = epp->ep_hdr; 227 struct ecoff_filehdr *efp = &execp->f; 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 epp->ep_vp->v_writecount != 0) { 243 #ifdef DIAGNOSTIC 244 if (epp->ep_vp->v_flag & VTEXT) 245 panic("exec: a VTEXT vnode has writecount != 0\n"); 246 #endif 247 return ETXTBSY; 248 } 249 epp->ep_vp->v_flag |= VTEXT; 250 251 /* set up command for text segment */ 252 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize, 253 epp->ep_taddr, epp->ep_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, epp->ep_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 exec_ecoff_setup_stack(p, epp); 267 } 268
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