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 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h>
   37 #include <sys/exec.h>
   38 #include <sys/imgact.h>
   39 #include <sys/lock.h>
   40 #include <sys/module.h>
   41 #include <sys/sysent.h>
   42 #include <sys/signalvar.h>
   43 #include <sys/proc.h>
   44 #include <sys/sx.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/pmap.h>
   48 #include <vm/vm_param.h>
   49 
   50 #include <i386/ibcs2/ibcs2_syscall.h>
   51 #include <i386/ibcs2/ibcs2_signal.h>
   52 
   53 MODULE_VERSION(ibcs2, 1);
   54 
   55 extern int bsd_to_ibcs2_errno[];
   56 extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
   57 extern int szsigcode;
   58 extern char sigcode[];
   59 static int ibcs2_fixup(register_t **, struct image_params *);
   60 
   61 struct sysentvec ibcs2_svr3_sysvec = {
   62         sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
   63         ibcs2_sysent,
   64         0xFF,
   65         IBCS2_SIGTBLSZ,
   66         bsd_to_ibcs2_sig,
   67         ELAST + 1,
   68         bsd_to_ibcs2_errno,
   69         NULL,           /* trap-to-signal translation function */
   70         ibcs2_fixup,    /* fixup */
   71         sendsig,
   72         sigcode,        /* use generic trampoline */
   73         &szsigcode,     /* use generic trampoline size */
   74         NULL,           /* prepsyscall */
   75         "IBCS2 COFF",
   76         NULL,           /* we don't have a COFF coredump function */
   77         NULL,
   78         IBCS2_MINSIGSTKSZ,
   79         PAGE_SIZE,
   80         VM_MIN_ADDRESS,
   81         VM_MAXUSER_ADDRESS,
   82         USRSTACK,
   83         PS_STRINGS,
   84         VM_PROT_ALL,
   85         exec_copyout_strings,
   86         exec_setregs,
   87         NULL
   88 };
   89 
   90 static int
   91 ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
   92 {
   93 
   94         return (suword(--(*stack_base), imgp->argc));
   95 }
   96 
   97 /*
   98  * Create an "ibcs2" module that does nothing but allow checking for
   99  * the presence of the subsystem.
  100  */
  101 static int
  102 ibcs2_modevent(module_t mod, int type, void *unused)
  103 {
  104         struct proc *p = NULL;
  105         int rval = 0;
  106 
  107         switch(type) {
  108         case MOD_LOAD:
  109                 break;
  110         case MOD_UNLOAD:
  111                 /* if this was an ELF module we'd use elf_brand_inuse()... */
  112                 sx_slock(&allproc_lock);
  113                 LIST_FOREACH(p, &allproc, p_list) {
  114                         if (p->p_sysent == &ibcs2_svr3_sysvec) {
  115                                 rval = EBUSY;
  116                                 break;
  117                         }
  118                 }
  119                 sx_sunlock(&allproc_lock);
  120                 break;
  121         default:
  122                 rval = EOPNOTSUPP;
  123                 break;
  124         }
  125         return (rval);
  126 }
  127 static moduledata_t ibcs2_mod = {
  128         "ibcs2",
  129         ibcs2_modevent,
  130         0
  131 };
  132 DECLARE_MODULE(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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