69b8756d3d
explicit process at fork trampoline path instead of eventhadler(schedtail) invocation for each child process. Remove eventhandler(schedtail) code and change linux ABI to use newly added sysvec method. While here replace explicit comparing of module sysentvec structure with the newly created process sysentvec to detect the linux ABI. Discussed with: kib MFC after: 2 Week
139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*-
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* Copyright (c) 1995 Steven Wallace
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Steven Wallace.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/sysent.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <i386/ibcs2/ibcs2_syscall.h>
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#include <i386/ibcs2/ibcs2_signal.h>
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MODULE_VERSION(ibcs2, 1);
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extern int bsd_to_ibcs2_errno[];
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extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
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extern int szsigcode;
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extern char sigcode[];
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static int ibcs2_fixup(register_t **, struct image_params *);
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struct sysentvec ibcs2_svr3_sysvec = {
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.sv_size = sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
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.sv_table = ibcs2_sysent,
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.sv_mask = 0xff,
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.sv_sigsize = IBCS2_SIGTBLSZ,
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.sv_sigtbl = bsd_to_ibcs2_sig,
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.sv_errsize = ELAST + 1,
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.sv_errtbl = bsd_to_ibcs2_errno,
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.sv_transtrap = NULL,
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.sv_fixup = ibcs2_fixup,
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.sv_sendsig = sendsig,
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.sv_sigcode = sigcode, /* use generic trampoline */
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.sv_szsigcode = &szsigcode,
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.sv_prepsyscall = NULL,
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.sv_name = "IBCS2 COFF",
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.sv_coredump = NULL, /* we don't have a COFF coredump function */
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.sv_imgact_try = NULL,
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.sv_minsigstksz = IBCS2_MINSIGSTKSZ,
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.sv_pagesize = PAGE_SIZE,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS,
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = exec_copyout_strings,
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.sv_setregs = exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = cpu_set_syscall_retval,
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.sv_fetch_syscall_args = cpu_fetch_syscall_args,
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.sv_syscallnames = NULL,
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.sv_schedtail = NULL,
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};
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static int
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ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
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{
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return (suword(--(*stack_base), imgp->args->argc));
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}
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/*
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* Create an "ibcs2" module that does nothing but allow checking for
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* the presence of the subsystem.
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*/
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static int
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ibcs2_modevent(module_t mod, int type, void *unused)
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{
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struct proc *p = NULL;
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int rval = 0;
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switch(type) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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/* if this was an ELF module we'd use elf_brand_inuse()... */
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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if (p->p_sysent == &ibcs2_svr3_sysvec) {
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rval = EBUSY;
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break;
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}
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}
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sx_sunlock(&allproc_lock);
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break;
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default:
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rval = EOPNOTSUPP;
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break;
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}
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return (rval);
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}
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static moduledata_t ibcs2_mod = {
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"ibcs2",
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ibcs2_modevent,
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0
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};
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DECLARE_MODULE_TIED(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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