cbe522d307
an efficient way for the kernel to bounce certain mundane traps back to userland for handling there. A user trap handler returns directly to the trapping user code, rather than going through the kernel again. Only a handful of instructions are actually executed in kernel mode. Implement sysarch(SPARC_UTRAP_INSTALL). Add code to handle sharing of the user trap table across forks and unsharing at exec. This can be used to implement efficient tracking of floating point register usage in userland, fe by a thread library, and to handle alignment fault fixups and instruction emulation in userland, for which the code may need to be different for 32bit and 64bit binaries.
57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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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 the University of
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* California, Berkeley and its contributors.
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* 4. 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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* from: @(#)proc.h 7.1 (Berkeley) 5/15/91
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* from: FreeBSD: src/sys/i386/include/proc.h,v 1.11 2001/06/29
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROC_H_
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#define _MACHINE_PROC_H_
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#include <machine/tte.h>
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#include <machine/utrap.h>
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struct md_utrap {
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utrap_entry_t *ut_precise[UT_MAX]; /* must be first */
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int ut_refcnt;
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};
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struct mdthread {
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};
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struct mdproc {
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struct md_utrap *md_utrap;
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};
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#endif /* !_MACHINE_PROC_H_ */
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