330 lines
10 KiB
C
330 lines
10 KiB
C
/* $NetBSD: setemul.c,v 1.29 2011/04/26 16:57:42 joerg Exp $ */
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/*-
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* Copyright (c) 2000 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) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: setemul.c,v 1.29 2011/04/26 16:57:42 joerg Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <vis.h>
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#include "setemul.h"
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#include <sys/syscall.h>
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#include "../../sys/compat/netbsd32/netbsd32_syscall.h"
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#include "../../sys/compat/freebsd/freebsd_syscall.h"
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#include "../../sys/compat/ibcs2/ibcs2_syscall.h"
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#include "../../sys/compat/linux/linux_syscall.h"
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#include "../../sys/compat/linux32/linux32_syscall.h"
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#include "../../sys/compat/osf1/osf1_syscall.h"
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#include "../../sys/compat/sunos32/sunos32_syscall.h"
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#include "../../sys/compat/sunos/sunos_syscall.h"
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#include "../../sys/compat/svr4/svr4_syscall.h"
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#include "../../sys/compat/svr4_32/svr4_32_syscall.h"
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#include "../../sys/compat/ultrix/ultrix_syscall.h"
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#ifdef __m68k__
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#include "../../sys/compat/aoutm68k/aoutm68k_syscall.h"
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#endif
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#define KTRACE
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#include "../../sys/kern/syscalls.c"
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#include "../../sys/compat/netbsd32/netbsd32_syscalls.c"
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#include "../../sys/compat/freebsd/freebsd_syscalls.c"
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#include "../../sys/compat/ibcs2/ibcs2_syscalls.c"
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#include "../../sys/compat/linux/linux_syscalls.c"
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#include "../../sys/compat/linux32/linux32_syscalls.c"
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#include "../../sys/compat/osf1/osf1_syscalls.c"
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#include "../../sys/compat/sunos/sunos_syscalls.c"
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#include "../../sys/compat/sunos32/sunos32_syscalls.c"
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#include "../../sys/compat/svr4/svr4_syscalls.c"
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#include "../../sys/compat/svr4_32/svr4_32_syscalls.c"
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#include "../../sys/compat/ultrix/ultrix_syscalls.c"
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#ifdef __m68k__
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#include "../../sys/compat/aoutm68k/aoutm68k_syscalls.c"
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#endif
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#include "../../sys/compat/svr4/svr4_errno.c"
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#include "../../sys/compat/ibcs2/ibcs2_errno.c"
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#include "../../sys/compat/osf1/osf1_errno.c"
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#include "../../sys/compat/linux/common/linux_errno.c"
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#undef KTRACE
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#define SIGRTMIN 33 /* XXX */
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#include "../../sys/compat/svr4/svr4_signo.c"
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#include "../../sys/compat/ibcs2/ibcs2_signo.c"
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#include "../../sys/compat/osf1/osf1_signo.c"
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#include "../../sys/compat/linux/common/linux_signo.c"
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#define NELEM(a) (sizeof(a) / sizeof(a[0]))
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/* static */
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const struct emulation emulations[] = {
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{ "netbsd", syscallnames, SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, 0 },
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{ "netbsd32", netbsd32_syscallnames, SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, EMUL_FLAG_NETBSD32 },
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{ "freebsd", freebsd_syscallnames, FREEBSD_SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, 0 },
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{ "ibcs2", ibcs2_syscallnames, IBCS2_SYS_MAXSYSCALL,
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native_to_ibcs2_errno, NELEM(native_to_ibcs2_errno),
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ibcs2_to_native_signo, NSIG, 0 },
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{ "linux", linux_syscallnames, LINUX_SYS_MAXSYSCALL,
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native_to_linux_errno, NELEM(native_to_linux_errno),
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linux_to_native_signo, NSIG, 0 },
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{ "linux32", linux32_syscallnames, LINUX32_SYS_MAXSYSCALL,
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native_to_linux_errno, NELEM(native_to_linux_errno),
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linux_to_native_signo, NSIG, EMUL_FLAG_NETBSD32 },
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{ "osf1", osf1_syscallnames, OSF1_SYS_MAXSYSCALL,
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native_to_osf1_errno, NELEM(native_to_osf1_errno),
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osf1_to_native_signo, NSIG, 0 },
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{ "sunos32", sunos32_syscallnames, SUNOS32_SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, EMUL_FLAG_NETBSD32 },
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{ "sunos", sunos_syscallnames, SUNOS_SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, 0 },
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{ "svr4", svr4_syscallnames, SVR4_SYS_MAXSYSCALL,
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native_to_svr4_errno, NELEM(native_to_svr4_errno),
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svr4_to_native_signo, NSIG, 0 },
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{ "svr4_32", svr4_syscallnames, SVR4_SYS_MAXSYSCALL,
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native_to_svr4_errno, NELEM(native_to_svr4_errno),
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svr4_to_native_signo, NSIG, EMUL_FLAG_NETBSD32 },
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{ "ultrix", ultrix_syscallnames, ULTRIX_SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, 0 },
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#ifdef __m68k__
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{ "aoutm68k", aoutm68k_syscallnames, AOUTM68K_SYS_MAXSYSCALL,
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NULL, 0,
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NULL, 0, 0 },
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#endif
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{ NULL, NULL, 0,
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NULL, 0,
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NULL, 0, 0 }
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};
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struct emulation_ctx {
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pid_t pid;
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const struct emulation *emulation;
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LIST_ENTRY(emulation_ctx) ctx_link;
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};
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const struct emulation *cur_emul;
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const struct emulation *prev_emul;
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static const struct emulation *default_emul = &emulations[0];
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struct emulation_ctx *current_ctx;
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static LIST_HEAD(, emulation_ctx) emul_ctx =
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LIST_HEAD_INITIALIZER(emul_ctx);
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static struct emulation_ctx *ectx_find(pid_t);
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static void ectx_update(pid_t, const struct emulation *);
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void
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setemul(const char *name, pid_t pid, int update_ectx)
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{
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int i;
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const struct emulation *match = NULL;
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for (i = 0; emulations[i].name != NULL; i++) {
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if (strcmp(emulations[i].name, name) == 0) {
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match = &emulations[i];
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break;
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}
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}
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if (!match) {
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warnx("Emulation `%s' unknown", name);
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return;
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}
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if (update_ectx)
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ectx_update(pid, match);
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else
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default_emul = match;
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if (cur_emul != NULL)
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prev_emul = cur_emul;
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else
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prev_emul = match;
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cur_emul = match;
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}
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/*
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* Emulation context list is very simple chained list, not even hashed.
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* We expect the number of separate traced contexts/processes to be
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* fairly low, so it's not worth it to optimize this.
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* MMMmmmm not when I use it, it is only bounded PID_MAX!
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* Requeue looked up item at start of list to cache result since the
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* trace file tendes to have a burst of calls for a single process.
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*/
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/*
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* Find an emulation context appropriate for the given pid.
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*/
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static struct emulation_ctx *
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ectx_find(pid_t pid)
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{
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struct emulation_ctx *ctx;
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/* Find an existing entry */
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LIST_FOREACH(ctx, &emul_ctx, ctx_link) {
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if (ctx->pid == pid)
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break;
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}
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if (ctx == NULL) {
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/* create entry with default emulation */
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ctx = malloc(sizeof *ctx);
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if (ctx == NULL)
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err(1, "malloc emul context");
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ctx->pid = pid;
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ctx->emulation = default_emul;
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/* chain into the list */
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LIST_INSERT_HEAD(&emul_ctx, ctx, ctx_link);
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} else {
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/* move entry to head to optimize lookup for syscall bursts */
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LIST_REMOVE(ctx, ctx_link);
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LIST_INSERT_HEAD(&emul_ctx, ctx, ctx_link);
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}
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return ctx;
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}
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/*
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* Update emulation context for given pid, or create new if no context
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* for this pid exists.
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*/
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static void
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ectx_update(pid_t pid, const struct emulation *emul)
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{
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struct emulation_ctx *ctx;
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ctx = ectx_find(pid);
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ctx->emulation = emul;
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}
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/*
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* Ensure current emulation context is correct for given pid.
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*/
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void
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ectx_sanify(pid_t pid)
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{
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struct emulation_ctx *ctx;
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ctx = ectx_find(pid);
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cur_emul = ctx->emulation;
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}
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/*
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* Delete emulation context for current pid.
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* (eg when tracing exit())
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* Defer delete just in case we've cached a pointer...
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*/
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void
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ectx_delete(void)
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{
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static struct emulation_ctx *ctx = NULL;
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if (ctx != NULL)
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free(ctx);
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/*
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* The emulation for current syscall entry is always on HEAD, due
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* to code in ectx_find().
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*/
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ctx = LIST_FIRST(&emul_ctx);
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if (ctx)
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LIST_REMOVE(ctx, ctx_link);
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}
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