sys/kern/exec_ecoff.c

   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 struct execsw 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         switch (cmd) {
  78         case MODULE_CMD_INIT:
  79                 return exec_add(&exec_ecoff_execsw, 1);
  80
  81         case MODULE_CMD_FINI:
  82                 return exec_remove(&exec_ecoff_execsw, 1);
  83
  84         default:
  85                 return ENOTTY;
  86         }
  87 }
  88
  89 /*
  90  * exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
  91  *
  92  * Given a proc pointer and an exec package pointer, see if the referent
  93  * of the epp is in ecoff format.  Check 'standard' magic numbers for
  94  * this architecture.  If that fails, return failure.
  95  *
  96  * This function is  responsible for creating a set of vmcmds which can be
  97  * used to build the process's vm space and inserting them into the exec
  98  * package.
  99  */
 100 int
 101 exec_ecoff_makecmds(struct lwp *l, struct exec_package *epp)
 102 {
 103         int error;
 104         struct ecoff_exechdr *execp = epp->ep_hdr;
 105
 106         if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
 107                 return ENOEXEC;
 108
 109         if (ECOFF_BADMAG(execp))
 110                 return ENOEXEC;
 111
 112         error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp);
 113
 114         /*
 115          * if there was an error or there are already vmcmds set up,
 116          * we return.  (the latter can happen if cpu_exec_ecoff_hook()
 117          * recursively invokes check_exec() to handle loading of a
 118          * dynamically linked binary's shared loader.
 119          */
 120         if (error || epp->ep_vmcmds.evs_cnt)
 121                 return (error);
 122
 123         /*
 124          * prepare the exec package to map the executable.
 125          */
 126         switch (execp->a.magic) {
 127         case ECOFF_OMAGIC:
 128                 error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr,
 129                    epp->ep_vp);
 130                 break;
 131         case ECOFF_NMAGIC:
 132                 error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr,
 133                    epp->ep_vp);
 134                 break;
 135         case ECOFF_ZMAGIC:
 136                 error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr,
 137                    epp->ep_vp);
 138                 break;
 139         default:
 140                 return ENOEXEC;
 141         }
 142
 143         /* set up the stack */
 144         if (!error)
 145                 error = (*epp->ep_esch->es_setup_stack)(l, epp);
 146
 147         if (error)
 148                 kill_vmcmds(&epp->ep_vmcmds);
 149
 150         return error;
 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 lwp *l, 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 lwp *l, 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 lwp *l, 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         if (eap->bsize > 0)
 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 }