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: releng/8.4/sys/i386/ibcs2/ibcs2_sysvec.c 222846 2011-06-08 03:45:40Z dchagin $");
   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         .sv_size        = sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
   63         .sv_table       = ibcs2_sysent,
   64         .sv_mask        = 0xff,
   65         .sv_sigsize     = IBCS2_SIGTBLSZ,
   66         .sv_sigtbl      = bsd_to_ibcs2_sig,
   67         .sv_errsize     = ELAST + 1,
   68         .sv_errtbl      = bsd_to_ibcs2_errno,
   69         .sv_transtrap   = NULL,
   70         .sv_fixup       = ibcs2_fixup,
   71         .sv_sendsig     = sendsig,
   72         .sv_sigcode     = sigcode,      /* use generic trampoline */
   73         .sv_szsigcode   = &szsigcode,
   74         .sv_prepsyscall = NULL,
   75         .sv_name        = "IBCS2 COFF",
   76         .sv_coredump    = NULL, /* we don't have a COFF coredump function */
   77         .sv_imgact_try  = NULL,
   78         .sv_minsigstksz = IBCS2_MINSIGSTKSZ,
   79         .sv_pagesize    = PAGE_SIZE,
   80         .sv_minuser     = VM_MIN_ADDRESS,
   81         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   82         .sv_usrstack    = USRSTACK,
   83         .sv_psstrings   = PS_STRINGS,
   84         .sv_stackprot   = VM_PROT_ALL,
   85         .sv_copyout_strings = exec_copyout_strings,
   86         .sv_setregs     = exec_setregs,
   87         .sv_fixlimit    = NULL,
   88         .sv_maxssiz     = NULL,
   89         .sv_flags       = SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
   90         .sv_set_syscall_retval = cpu_set_syscall_retval,
   91         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   92         .sv_syscallnames = NULL,
   93         .sv_schedtail   = NULL,
   94 };
   95 
   96 static int
   97 ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
   98 {
   99 
  100         return (suword(--(*stack_base), imgp->args->argc));
  101 }
  102 
  103 /*
  104  * Create an "ibcs2" module that does nothing but allow checking for
  105  * the presence of the subsystem.
  106  */
  107 static int
  108 ibcs2_modevent(module_t mod, int type, void *unused)
  109 {
  110         struct proc *p = NULL;
  111         int rval = 0;
  112 
  113         switch(type) {
  114         case MOD_LOAD:
  115                 break;
  116         case MOD_UNLOAD:
  117                 /* if this was an ELF module we'd use elf_brand_inuse()... */
  118                 sx_slock(&allproc_lock);
  119                 FOREACH_PROC_IN_SYSTEM(p) {
  120                         if (p->p_sysent == &ibcs2_svr3_sysvec) {
  121                                 rval = EBUSY;
  122                                 break;
  123                         }
  124                 }
  125                 sx_sunlock(&allproc_lock);
  126                 break;
  127         default:
  128                 rval = EOPNOTSUPP;
  129                 break;
  130         }
  131         return (rval);
  132 }
  133 static moduledata_t ibcs2_mod = {
  134         "ibcs2",
  135         ibcs2_modevent,
  136         0
  137 };
  138 DECLARE_MODULE_TIED(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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