Home | History | Annotate | Line # | Download | only in include
pcb.h revision 1.4.32.1
      1  1.4.32.1   bouyer /*	$NetBSD: pcb.h,v 1.4.32.1 2001/03/12 13:29:21 bouyer Exp $ */
      2       1.3  deraadt 
      3       1.1  deraadt /*
      4       1.1  deraadt  * Copyright (c) 1992, 1993
      5       1.1  deraadt  *	The Regents of the University of California.  All rights reserved.
      6       1.1  deraadt  *
      7       1.1  deraadt  * This software was developed by the Computer Systems Engineering group
      8       1.1  deraadt  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9       1.1  deraadt  * contributed to Berkeley.
     10       1.1  deraadt  *
     11       1.1  deraadt  * All advertising materials mentioning features or use of this software
     12       1.1  deraadt  * must display the following acknowledgement:
     13       1.1  deraadt  *	This product includes software developed by the University of
     14       1.1  deraadt  *	California, Lawrence Berkeley Laboratory.
     15       1.1  deraadt  *
     16       1.1  deraadt  * Redistribution and use in source and binary forms, with or without
     17       1.1  deraadt  * modification, are permitted provided that the following conditions
     18       1.1  deraadt  * are met:
     19       1.1  deraadt  * 1. Redistributions of source code must retain the above copyright
     20       1.1  deraadt  *    notice, this list of conditions and the following disclaimer.
     21       1.1  deraadt  * 2. Redistributions in binary form must reproduce the above copyright
     22       1.1  deraadt  *    notice, this list of conditions and the following disclaimer in the
     23       1.1  deraadt  *    documentation and/or other materials provided with the distribution.
     24       1.1  deraadt  * 3. All advertising materials mentioning features or use of this software
     25       1.1  deraadt  *    must display the following acknowledgement:
     26       1.1  deraadt  *	This product includes software developed by the University of
     27       1.1  deraadt  *	California, Berkeley and its contributors.
     28       1.1  deraadt  * 4. Neither the name of the University nor the names of its contributors
     29       1.1  deraadt  *    may be used to endorse or promote products derived from this software
     30       1.1  deraadt  *    without specific prior written permission.
     31       1.1  deraadt  *
     32       1.1  deraadt  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     33       1.1  deraadt  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     34       1.1  deraadt  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     35       1.1  deraadt  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     36       1.1  deraadt  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     37       1.1  deraadt  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     38       1.1  deraadt  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39       1.1  deraadt  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     40       1.1  deraadt  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     41       1.1  deraadt  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     42       1.1  deraadt  * SUCH DAMAGE.
     43       1.1  deraadt  *
     44       1.1  deraadt  *	@(#)pcb.h	8.1 (Berkeley) 6/11/93
     45       1.1  deraadt  */
     46       1.1  deraadt 
     47       1.1  deraadt #include <machine/reg.h>
     48       1.1  deraadt 
     49       1.1  deraadt #ifdef notyet
     50       1.1  deraadt #define	PCB_MAXWIN	32	/* architectural limit */
     51       1.1  deraadt #else
     52       1.1  deraadt #define	PCB_MAXWIN	8	/* worried about u area sizes ... */
     53       1.1  deraadt #endif
     54       1.1  deraadt 
     55       1.1  deraadt /*
     56       1.1  deraadt  * SPARC Process Control Block.
     57       1.1  deraadt  *
     58       1.1  deraadt  * pcb_uw is positive if there are any user windows that are
     59       1.1  deraadt  * are currently in the CPU windows rather than on the user
     60       1.1  deraadt  * stack.  Whenever we are running in the kernel with traps
     61       1.1  deraadt  * enabled, we decrement pcb_uw for each ``push'' of a CPU
     62       1.1  deraadt  * register window into the stack, and we increment it for
     63       1.1  deraadt  * each ``pull'' from the stack into the CPU.  (If traps are
     64       1.1  deraadt  * disabled, or if we are in user mode, pcb_uw is junk.)
     65       1.1  deraadt  *
     66       1.1  deraadt  * To ease computing pcb_uw on traps from user mode, we keep track
     67       1.1  deraadt  * of the log base 2 of the single bit that is set in %wim.
     68       1.1  deraadt  *
     69       1.1  deraadt  * If an overflow occurs while the associated user stack pages
     70       1.1  deraadt  * are invalid (paged out), we have to store the registers
     71       1.1  deraadt  * in a page that is locked in core while the process runs,
     72       1.1  deraadt  * i.e., right here in the pcb.  We also need the stack pointer
     73       1.1  deraadt  * for the last such window (but only the last, as the others
     74       1.1  deraadt  * are in each window) and the count of windows saved.  We
     75       1.1  deraadt  * cheat by having a whole window structure for that one %sp.
     76       1.1  deraadt  * Thus, to save window pcb_rw[i] to memory, we write it at
     77       1.1  deraadt  * pcb_rw[i + 1].rw_in[6].
     78       1.1  deraadt  *
     79       1.1  deraadt  * pcb_nsaved has three `kinds' of values.  If 0, it means no
     80       1.1  deraadt  * registers are in the PCB (though if pcb_uw is positive,
     81       1.1  deraadt  * there may be the next time you look).  If positive, it means
     82       1.1  deraadt  * there are no user registers in the CPU, but there are some
     83       1.1  deraadt  * saved in pcb_rw[].  As a special case, traps that needed
     84       1.1  deraadt  * assistance to pull user registers from the stack also store
     85       1.1  deraadt  * the registers in pcb_rw[], and set pcb_nsaved to -1.  This
     86       1.1  deraadt  * special state is normally short-term: it can only last until the
     87       1.1  deraadt  * trap returns, and it can never persist across entry to user code.
     88       1.1  deraadt  */
     89       1.1  deraadt struct pcb {
     90       1.2  deraadt 	int	pcb_sp;		/* sp (%o6) when switch() was called */
     91       1.2  deraadt 	int	pcb_pc;		/* pc (%o7) when switch() was called */
     92       1.2  deraadt 	int	pcb_psr;	/* %psr when switch() was called */
     93       1.1  deraadt 
     94       1.1  deraadt 	caddr_t	pcb_onfault;	/* for copyin/out */
     95       1.1  deraadt 
     96       1.1  deraadt 	int	pcb_uw;		/* user windows inside CPU */
     97       1.1  deraadt 	int	pcb_wim;	/* log2(%wim) */
     98       1.1  deraadt 	int	pcb_nsaved;	/* number of windows saved in pcb */
     99       1.1  deraadt 
    100       1.1  deraadt #ifdef notdef
    101       1.1  deraadt 	int	pcb_winof;	/* number of window overflow traps */
    102       1.1  deraadt 	int	pcb_winuf;	/* number of window underflow traps */
    103       1.1  deraadt #endif
    104       1.1  deraadt 	int	pcb_pad;	/* pad to doubleword boundary */
    105       1.1  deraadt 
    106       1.1  deraadt 	/* the following MUST be aligned on a doubleword boundary */
    107       1.1  deraadt 	struct	rwindow pcb_rw[PCB_MAXWIN];	/* saved windows */
    108       1.1  deraadt };
    109       1.1  deraadt 
    110       1.1  deraadt /*
    111       1.1  deraadt  * The pcb is augmented with machine-dependent additional data for
    112       1.1  deraadt  * core dumps.  Note that the trapframe here is a copy of the one
    113       1.1  deraadt  * from the top of the kernel stack (included here so that the kernel
    114       1.1  deraadt  * stack itself need not be dumped).
    115       1.1  deraadt  */
    116       1.1  deraadt struct md_coredump {
    117       1.1  deraadt 	struct	trapframe md_tf;
    118       1.1  deraadt 	struct	fpstate md_fpstate;
    119       1.1  deraadt };
    120