456 lines
14 KiB
C
456 lines
14 KiB
C
/* $NetBSD: kern_stub.c,v 1.21 2009/11/03 05:23:28 dyoung Exp $ */
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/*-
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* Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_xxx.c 8.3 (Berkeley) 3/29/95
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*/
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/*
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* Stubs for system calls and facilities not included in the system.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_stub.c,v 1.21 2009/11/03 05:23:28 dyoung Exp $");
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#include "opt_ptrace.h"
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#include "opt_ktrace.h"
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#include "opt_modular.h"
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#include "opt_sa.h"
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#ifdef _KERNEL_OPT
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#include "fs_lfs.h"
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#endif
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/* XXX To get syscall prototypes. */
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#define SYSVSHM
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#define SYSVSEM
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#define SYSVMSG
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/fstypes.h>
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#include <sys/signalvar.h>
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#include <sys/syscall.h>
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#include <sys/syscallargs.h>
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#include <sys/syscallvar.h>
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#include <sys/ktrace.h>
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#include <sys/intr.h>
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#include <sys/cpu.h>
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#include <sys/module.h>
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/*
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* Nonexistent system call-- signal process (may want to handle it). Flag
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* error in case process won't see signal immediately (blocked or ignored).
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*/
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#ifndef PTRACE
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__weak_alias(sys_ptrace,sys_nosys);
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#endif /* PTRACE */
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/*
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* ktrace stubs. ktruser() goes to enosys as we want to fail the syscall,
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* but not kill the process: utrace() is a debugging feature.
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*/
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#ifndef KTRACE
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__weak_alias(ktr_csw,nullop); /* Probes */
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__weak_alias(ktr_emul,nullop);
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__weak_alias(ktr_geniov,nullop);
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__weak_alias(ktr_genio,nullop);
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__weak_alias(ktr_mibio,nullop);
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__weak_alias(ktr_namei,nullop);
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__weak_alias(ktr_namei2,nullop);
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__weak_alias(ktr_psig,nullop);
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__weak_alias(ktr_saupcall,nullop);
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__weak_alias(ktr_syscall,nullop);
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__weak_alias(ktr_sysret,nullop);
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__weak_alias(ktr_kuser,nullop);
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__weak_alias(ktr_mmsg,nullop);
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__weak_alias(ktr_mib,nullop);
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__weak_alias(ktr_mool,nullop);
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__weak_alias(ktr_execarg,nullop);
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__weak_alias(ktr_execenv,nullop);
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__weak_alias(sys_fktrace,sys_nosys); /* Syscalls */
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__weak_alias(sys_ktrace,sys_nosys);
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__weak_alias(sys_utrace,sys_nosys);
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int ktrace_on; /* Misc */
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__weak_alias(ktruser,enosys);
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__weak_alias(ktr_point,nullop);
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#endif /* KTRACE */
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__weak_alias(spldebug_start, voidop);
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__weak_alias(spldebug_stop, voidop);
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__weak_alias(machdep_init,nullop);
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#if !defined(KERN_SA)
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/*
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* Scheduler activations system calls. These need to remain, even when
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* KERN_SA isn't defined, until libc's major version is bumped.
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*/
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__strong_alias(sys_sa_register,sys_nosys);
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__strong_alias(sys_sa_stacks,sys_nosys);
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__strong_alias(sys_sa_enable,sys_nosys);
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__strong_alias(sys_sa_setconcurrency,sys_nosys);
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__strong_alias(sys_sa_yield,sys_nosys);
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__strong_alias(sys_sa_preempt,sys_nosys);
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__strong_alias(sys_sa_unblockyield,sys_nosys);
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/*
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* Stubs for compat_netbsd32.
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*/
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__strong_alias(dosa_register,sys_nosys);
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__strong_alias(sa_stacks1,sys_nosys);
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#endif
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/*
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* Stubs for architectures that do not support kernel preemption.
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*/
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#ifndef __HAVE_PREEMPTION
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bool
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cpu_kpreempt_enter(uintptr_t where, int s)
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{
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return false;
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}
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void
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cpu_kpreempt_exit(uintptr_t where)
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{
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}
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bool
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cpu_kpreempt_disabled(void)
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{
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return true;
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}
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#else
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# ifndef MULTIPROCESSOR
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# error __HAVE_PREEMPTION requires MULTIPROCESSOR
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# endif
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#endif /* !__HAVE_PREEMPTION */
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int
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sys_nosys(struct lwp *l, const void *v, register_t *retval)
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{
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mutex_enter(proc_lock);
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psignal(l->l_proc, SIGSYS);
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mutex_exit(proc_lock);
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return ENOSYS;
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}
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int
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sys_nomodule(struct lwp *l, const void *v, register_t *retval)
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{
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#ifdef MODULAR
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static struct {
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u_int al_code;
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const char *al_module;
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} const autoload[] = {
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{ SYS_aio_cancel, "aio" },
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{ SYS_aio_error, "aio" },
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{ SYS_aio_fsync, "aio" },
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{ SYS_aio_read, "aio" },
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{ SYS_aio_return, "aio" },
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{ SYS___aio_suspend50, "aio" },
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{ SYS_aio_write, "aio" },
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{ SYS_lio_listio, "aio" },
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{ SYS_mq_open, "mqueue" },
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{ SYS_mq_close, "mqueue" },
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{ SYS_mq_unlink, "mqueue" },
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{ SYS_mq_getattr, "mqueue" },
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{ SYS_mq_setattr, "mqueue" },
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{ SYS_mq_notify, "mqueue" },
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{ SYS_mq_send, "mqueue" },
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{ SYS_mq_receive, "mqueue" },
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{ SYS___mq_timedsend50, "mqueue" },
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{ SYS___mq_timedreceive50, "mqueue" },
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{ SYS_compat_43_fstat43, "compat" },
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{ SYS_compat_43_lstat43, "compat" },
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{ SYS_compat_43_oaccept, "compat" },
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{ SYS_compat_43_ocreat, "compat" },
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{ SYS_compat_43_oftruncate, "compat" },
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{ SYS_compat_43_ogetdirentries, "compat" },
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{ SYS_compat_43_ogetdtablesize, "compat" },
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{ SYS_compat_43_ogethostid, "compat" },
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{ SYS_compat_43_ogethostname, "compat" },
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{ SYS_compat_43_ogetkerninfo, "compat" },
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{ SYS_compat_43_ogetpagesize, "compat" },
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{ SYS_compat_43_ogetpeername, "compat" },
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{ SYS_compat_43_ogetrlimit, "compat" },
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{ SYS_compat_43_ogetsockname, "compat" },
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{ SYS_compat_43_okillpg, "compat" },
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{ SYS_compat_43_olseek, "compat" },
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{ SYS_compat_43_ommap, "compat" },
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{ SYS_compat_43_oquota, "compat" },
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{ SYS_compat_43_orecv, "compat" },
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{ SYS_compat_43_orecvfrom, "compat" },
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{ SYS_compat_43_orecvmsg, "compat" },
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{ SYS_compat_43_osend, "compat" },
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{ SYS_compat_43_osendmsg, "compat" },
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{ SYS_compat_43_osethostid, "compat" },
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{ SYS_compat_43_osethostname, "compat" },
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{ SYS_compat_43_osetrlimit, "compat" },
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{ SYS_compat_43_osigblock, "compat" },
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{ SYS_compat_43_osigsetmask, "compat" },
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{ SYS_compat_43_osigstack, "compat" },
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{ SYS_compat_43_osigvec, "compat" },
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{ SYS_compat_43_otruncate, "compat" },
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{ SYS_compat_43_owait, "compat" },
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{ SYS_compat_43_stat43, "compat" },
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{ SYS_compat_09_ogetdomainname, "compat" },
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{ SYS_compat_09_osetdomainname, "compat" },
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{ SYS_compat_09_ouname, "compat" },
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#ifndef _LP64
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{ SYS_compat_10_omsgsys, "compat" },
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{ SYS_compat_10_osemsys, "compat" },
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{ SYS_compat_10_oshmsys, "compat" },
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#endif
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{ SYS_compat_12_fstat12, "compat" },
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{ SYS_compat_12_getdirentries, "compat" },
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{ SYS_compat_12_lstat12, "compat" },
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{ SYS_compat_12_msync, "compat" },
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{ SYS_compat_12_oreboot, "compat" },
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{ SYS_compat_12_oswapon, "compat" },
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{ SYS_compat_12_stat12, "compat" },
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{ SYS_compat_13_sigaction13, "compat" },
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{ SYS_compat_13_sigaltstack13, "compat" },
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{ SYS_compat_13_sigpending13, "compat" },
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{ SYS_compat_13_sigprocmask13, "compat" },
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{ SYS_compat_13_sigreturn13, "compat" },
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{ SYS_compat_13_sigsuspend13, "compat" },
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{ SYS_compat_14___semctl, "compat" },
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{ SYS_compat_14_msgctl, "compat" },
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{ SYS_compat_14_shmctl, "compat" },
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{ SYS_compat_16___sigaction14, "compat" },
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{ SYS_compat_16___sigreturn14, "compat" },
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{ SYS_compat_20_fhstatfs, "compat" },
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{ SYS_compat_20_fstatfs, "compat" },
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{ SYS_compat_20_getfsstat, "compat" },
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{ SYS_compat_20_statfs, "compat" },
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{ SYS_compat_30___fhstat30, "compat" },
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{ SYS_compat_30___fstat13, "compat" },
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{ SYS_compat_30___lstat13, "compat" },
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{ SYS_compat_30___stat13, "compat" },
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{ SYS_compat_30_fhopen, "compat" },
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{ SYS_compat_30_fhstat, "compat" },
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{ SYS_compat_30_fhstatvfs1, "compat" },
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{ SYS_compat_30_getdents, "compat" },
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{ SYS_compat_30_getfh, "compat" },
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{ SYS_compat_30_socket, "compat" },
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{ SYS_compat_40_mount, "compat" },
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{ SYS_compat_50_wait4, "compat" },
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{ SYS_compat_50_mknod, "compat" },
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{ SYS_compat_50_setitimer, "compat" },
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{ SYS_compat_50_getitimer, "compat" },
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{ SYS_compat_50_select, "compat" },
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{ SYS_compat_50_gettimeofday, "compat" },
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{ SYS_compat_50_getrusage, "compat" },
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{ SYS_compat_50_settimeofday, "compat" },
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{ SYS_compat_50_utimes, "compat" },
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{ SYS_compat_50_adjtime, "compat" },
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#ifdef LFS
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{ SYS_compat_50_lfs_segwait, "compat" },
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#endif
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{ SYS_compat_50_futimes, "compat" },
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{ SYS_compat_50_clock_gettime, "compat" },
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{ SYS_compat_50_clock_settime, "compat" },
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{ SYS_compat_50_clock_getres, "compat" },
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{ SYS_compat_50_timer_settime, "compat" },
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{ SYS_compat_50_timer_gettime, "compat" },
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{ SYS_compat_50_nanosleep, "compat" },
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{ SYS_compat_50___sigtimedwait, "compat" },
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{ SYS_compat_50_mq_timedsend, "compat" },
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{ SYS_compat_50_mq_timedreceive, "compat" },
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{ SYS_compat_50_lutimes, "compat" },
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{ SYS_compat_50_____semctl13, "compat" },
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{ SYS_compat_50___msgctl13, "compat" },
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{ SYS_compat_50___shmctl13, "compat" },
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{ SYS_compat_50__lwp_park, "compat" },
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{ SYS_compat_50_kevent, "compat" },
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{ SYS_compat_50_pselect, "compat" },
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{ SYS_compat_50_pollts, "compat" },
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{ SYS_compat_50___stat30, "compat" },
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{ SYS_compat_50___fstat30, "compat" },
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{ SYS_compat_50___lstat30, "compat" },
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{ SYS_compat_50___ntp_gettime30, "compat" },
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{ SYS_compat_50___fhstat40, "compat" },
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{ SYS_compat_50_aio_suspend, "compat" },
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{ SYS__ksem_init, "ksem" },
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{ SYS__ksem_open, "ksem" },
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{ SYS__ksem_unlink, "ksem" },
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{ SYS__ksem_close, "ksem" },
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{ SYS__ksem_post, "ksem" },
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{ SYS__ksem_wait, "ksem" },
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{ SYS__ksem_trywait, "ksem" },
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{ SYS__ksem_getvalue, "ksem" },
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{ SYS__ksem_destroy, "ksem" },
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{ SYS_nfssvc, "nfsserver" },
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};
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const struct sysent *sy;
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const struct emul *em;
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int code, i;
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/*
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* Restart the syscall if we interrupted a module unload that
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* failed. Acquiring module_lock delays us until any unload
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* has been completed or rolled back.
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*/
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mutex_enter(&module_lock);
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sy = l->l_sysent;
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if (sy->sy_call != sys_nomodule) {
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mutex_exit(&module_lock);
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return ERESTART;
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}
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/*
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* Try to autoload a module to satisfy the request. If it
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* works, retry the request.
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*/
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em = l->l_proc->p_emul;
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if (em == &emul_netbsd) {
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code = sy - em->e_sysent;
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for (i = 0; i < __arraycount(autoload); i++) {
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if (autoload[i].al_code != code) {
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continue;
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}
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if (module_autoload(autoload[i].al_module,
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MODULE_CLASS_ANY) != 0 ||
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sy->sy_call == sys_nomodule) {
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break;
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}
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mutex_exit(&module_lock);
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return ERESTART;
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}
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}
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mutex_exit(&module_lock);
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#endif /* MODULAR */
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return sys_nosys(l, v, retval);
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}
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/*
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* Unsupported device function (e.g. writing to read-only device).
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*/
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int
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enodev(void)
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{
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return (ENODEV);
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}
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/*
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* Unconfigured device function; driver not configured.
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*/
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int
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enxio(void)
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{
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return (ENXIO);
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}
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/*
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* Unsupported ioctl function.
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*/
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int
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enoioctl(void)
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{
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return (ENOTTY);
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}
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/*
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* Unsupported system function.
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* This is used for an otherwise-reasonable operation
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* that is not supported by the current system binary.
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*/
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int
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enosys(void)
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{
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return (ENOSYS);
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}
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/*
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* Return error for operation not supported
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* on a specific object or file type.
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*/
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int
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eopnotsupp(void)
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{
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return (EOPNOTSUPP);
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}
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/*
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* Generic null operation, void return value.
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*/
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void
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voidop(void)
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{
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}
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/*
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* Generic null operation, always returns success.
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*/
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/*ARGSUSED*/
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int
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nullop(void *v)
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{
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return (0);
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}
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