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  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (c) 1995 Steven Wallace
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Steven Wallace.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/12.0/sys/i386/ibcs2/ibcs2_sysvec.c 326260 2017-11-27 15:08:52Z pfg $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/kernel.h>
   38 #include <sys/systm.h>
   39 #include <sys/exec.h>
   40 #include <sys/imgact.h>
   41 #include <sys/lock.h>
   42 #include <sys/module.h>
   43 #include <sys/sysent.h>
   44 #include <sys/signalvar.h>
   45 #include <sys/proc.h>
   46 #include <sys/sx.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/pmap.h>
   50 #include <vm/vm_param.h>
   51 
   52 #include <i386/ibcs2/ibcs2_syscall.h>
   53 #include <i386/ibcs2/ibcs2_signal.h>
   54 
   55 MODULE_VERSION(ibcs2, 1);
   56 
   57 extern int bsd_to_ibcs2_errno[];
   58 extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
   59 static int ibcs2_fixup(register_t **, struct image_params *);
   60 
   61 struct sysentvec ibcs2_svr3_sysvec = {
   62         .sv_size        = nitems(ibcs2_sysent),
   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         .sv_thread_detach = NULL,
   95         .sv_trap        = NULL,
   96 };
   97 
   98 static int
   99 ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
  100 {
  101 
  102         return (suword(--(*stack_base), imgp->args->argc));
  103 }
  104 
  105 /*
  106  * Create an "ibcs2" module that does nothing but allow checking for
  107  * the presence of the subsystem.
  108  */
  109 static int
  110 ibcs2_modevent(module_t mod, int type, void *unused)
  111 {
  112         struct proc *p = NULL;
  113         int rval = 0;
  114 
  115         switch(type) {
  116         case MOD_LOAD:
  117                 break;
  118         case MOD_UNLOAD:
  119                 /* if this was an ELF module we'd use elf_brand_inuse()... */
  120                 sx_slock(&allproc_lock);
  121                 FOREACH_PROC_IN_SYSTEM(p) {
  122                         if (p->p_sysent == &ibcs2_svr3_sysvec) {
  123                                 rval = EBUSY;
  124                                 break;
  125                         }
  126                 }
  127                 sx_sunlock(&allproc_lock);
  128                 break;
  129         default:
  130                 rval = EOPNOTSUPP;
  131                 break;
  132         }
  133         return (rval);
  134 }
  135 static moduledata_t ibcs2_mod = {
  136         "ibcs2",
  137         ibcs2_modevent,
  138         0
  139 };
  140 DECLARE_MODULE_TIED(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);

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