124 lines
5.1 KiB
C
124 lines
5.1 KiB
C
/* $NetBSD: pcb.h,v 1.4 1995/03/28 18:19:56 jtc Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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, Lawrence Berkeley Laboratory.
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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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* @(#)pcb.h 8.1 (Berkeley) 6/11/93
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*/
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#include <machine/reg.h>
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#ifdef notyet
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#define PCB_MAXWIN 32 /* architectural limit */
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#else
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#define PCB_MAXWIN 8 /* worried about u area sizes ... */
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#endif
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/*
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* SPARC Process Control Block.
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*
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* pcb_uw is positive if there are any user windows that are
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* are currently in the CPU windows rather than on the user
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* stack. Whenever we are running in the kernel with traps
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* enabled, we decrement pcb_uw for each ``push'' of a CPU
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* register window into the stack, and we increment it for
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* each ``pull'' from the stack into the CPU. (If traps are
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* disabled, or if we are in user mode, pcb_uw is junk.)
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*
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* To ease computing pcb_uw on traps from user mode, we keep track
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* of the log base 2 of the single bit that is set in %wim.
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*
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* If an overflow occurs while the associated user stack pages
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* are invalid (paged out), we have to store the registers
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* in a page that is locked in core while the process runs,
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* i.e., right here in the pcb. We also need the stack pointer
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* for the last such window (but only the last, as the others
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* are in each window) and the count of windows saved. We
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* cheat by having a whole window structure for that one %sp.
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* Thus, to save window pcb_rw[i] to memory, we write it at
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* pcb_rw[i + 1].rw_in[6].
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*
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* pcb_nsaved has three `kinds' of values. If 0, it means no
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* registers are in the PCB (though if pcb_uw is positive,
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* there may be the next time you look). If positive, it means
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* there are no user registers in the CPU, but there are some
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* saved in pcb_rw[]. As a special case, traps that needed
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* assistance to pull user registers from the stack also store
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* the registers in pcb_rw[], and set pcb_nsaved to -1. This
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* special state is normally short-term: it can only last until the
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* trap returns, and it can never persist across entry to user code.
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*/
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struct pcb {
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int pcb_sp; /* sp (%o6) when switch() was called */
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int pcb_pc; /* pc (%o7) when switch() was called */
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int pcb_psr; /* %psr when switch() was called */
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caddr_t pcb_onfault; /* for copyin/out */
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int pcb_uw; /* user windows inside CPU */
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int pcb_wim; /* log2(%wim) */
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int pcb_nsaved; /* number of windows saved in pcb */
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#ifdef notdef
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int pcb_winof; /* number of window overflow traps */
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int pcb_winuf; /* number of window underflow traps */
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#endif
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int pcb_pad; /* pad to doubleword boundary */
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/* the following MUST be aligned on a doubleword boundary */
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struct rwindow pcb_rw[PCB_MAXWIN]; /* saved windows */
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};
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/*
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* The pcb is augmented with machine-dependent additional data for
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* core dumps. Note that the trapframe here is a copy of the one
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* from the top of the kernel stack (included here so that the kernel
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* stack itself need not be dumped).
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*/
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struct md_coredump {
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struct trapframe md_tf;
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struct fpstate md_fpstate;
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};
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#ifdef _KERNEL
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extern struct pcb *cpcb;
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#endif /* _KERNEL */
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