The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/ibcs2_sysvec.c

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    1 /*
    2  * Copyright (c) 1995 Steven Wallace
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Steven Wallace.
   16  * 4. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/5.0/sys/i386/ibcs2/ibcs2_sysvec.c 102808 2002-09-01 21:41:24Z jake $
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/systm.h>
   36 #include <sys/exec.h>
   37 #include <sys/imgact.h>
   38 #include <sys/lock.h>
   39 #include <sys/module.h>
   40 #include <sys/sysent.h>
   41 #include <sys/signalvar.h>
   42 #include <sys/proc.h>
   43 #include <sys/sx.h>
   44 
   45 #include <vm/vm.h>
   46 #include <vm/pmap.h>
   47 #include <vm/vm_param.h>
   48 
   49 #include <i386/ibcs2/ibcs2_syscall.h>
   50 #include <i386/ibcs2/ibcs2_signal.h>
   51 
   52 MODULE_VERSION(ibcs2, 1);
   53 
   54 extern int bsd_to_ibcs2_errno[];
   55 extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
   56 extern int szsigcode;
   57 extern char sigcode[];
   58 static int ibcs2_fixup(register_t **, struct image_params *);
   59 
   60 struct sysentvec ibcs2_svr3_sysvec = {
   61         sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
   62         ibcs2_sysent,
   63         0xFF,
   64         IBCS2_SIGTBLSZ,
   65         bsd_to_ibcs2_sig,
   66         ELAST + 1,
   67         bsd_to_ibcs2_errno,
   68         NULL,           /* trap-to-signal translation function */
   69         ibcs2_fixup,    /* fixup */
   70         sendsig,
   71         sigcode,        /* use generic trampoline */
   72         &szsigcode,     /* use generic trampoline size */
   73         NULL,           /* prepsyscall */
   74         "IBCS2 COFF",
   75         NULL,           /* we don't have a COFF coredump function */
   76         NULL,
   77         IBCS2_MINSIGSTKSZ,
   78         PAGE_SIZE,
   79         VM_MIN_ADDRESS,
   80         VM_MAXUSER_ADDRESS,
   81         USRSTACK,
   82         PS_STRINGS,
   83         VM_PROT_ALL,
   84         exec_copyout_strings,
   85         exec_setregs
   86 };
   87 
   88 static int
   89 ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
   90 {
   91 
   92         return (suword(--(*stack_base), imgp->argc));
   93 }
   94 
   95 /*
   96  * Create an "ibcs2" module that does nothing but allow checking for
   97  * the presence of the subsystem.
   98  */
   99 static int
  100 ibcs2_modevent(module_t mod, int type, void *unused)
  101 {
  102         struct proc *p = NULL;
  103         int rval = 0;
  104 
  105         switch(type) {
  106         case MOD_UNLOAD:
  107                 /* if this was an ELF module we'd use elf_brand_inuse()... */
  108                 sx_slock(&allproc_lock);
  109                 LIST_FOREACH(p, &allproc, p_list) {
  110                         if (p->p_sysent == &ibcs2_svr3_sysvec) {
  111                                 rval = EBUSY;
  112                                 break;
  113                         }
  114                 }
  115                 sx_sunlock(&allproc_lock);
  116         default:
  117                 /* do not care */
  118                 break;
  119         }
  120         return (rval);
  121 }
  122 static moduledata_t ibcs2_mod = {
  123         "ibcs2",
  124         ibcs2_modevent,
  125         0
  126 };
  127 DECLARE_MODULE(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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