Home | History | Annotate | Line # | Download | only in include
pcb.h revision 1.2.2.1
      1  1.2.2.1  bouyer /*	$NetBSD: pcb.h,v 1.2.2.1 2000/11/20 20:26:49 bouyer Exp $ */
      2      1.1     eeh 
      3      1.1     eeh /*
      4      1.1     eeh  * Copyright (c) 1992, 1993
      5      1.1     eeh  *	The Regents of the University of California.  All rights reserved.
      6      1.1     eeh  *
      7      1.1     eeh  * This software was developed by the Computer Systems Engineering group
      8      1.1     eeh  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9      1.1     eeh  * contributed to Berkeley.
     10      1.1     eeh  *
     11      1.1     eeh  * All advertising materials mentioning features or use of this software
     12      1.1     eeh  * must display the following acknowledgement:
     13      1.1     eeh  *	This product includes software developed by the University of
     14      1.1     eeh  *	California, Lawrence Berkeley Laboratory.
     15      1.1     eeh  *
     16      1.1     eeh  * Redistribution and use in source and binary forms, with or without
     17      1.1     eeh  * modification, are permitted provided that the following conditions
     18      1.1     eeh  * are met:
     19      1.1     eeh  * 1. Redistributions of source code must retain the above copyright
     20      1.1     eeh  *    notice, this list of conditions and the following disclaimer.
     21      1.1     eeh  * 2. Redistributions in binary form must reproduce the above copyright
     22      1.1     eeh  *    notice, this list of conditions and the following disclaimer in the
     23      1.1     eeh  *    documentation and/or other materials provided with the distribution.
     24      1.1     eeh  * 3. All advertising materials mentioning features or use of this software
     25      1.1     eeh  *    must display the following acknowledgement:
     26      1.1     eeh  *	This product includes software developed by the University of
     27      1.1     eeh  *	California, Berkeley and its contributors.
     28      1.1     eeh  * 4. Neither the name of the University nor the names of its contributors
     29      1.1     eeh  *    may be used to endorse or promote products derived from this software
     30      1.1     eeh  *    without specific prior written permission.
     31      1.1     eeh  *
     32      1.1     eeh  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     33      1.1     eeh  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     34      1.1     eeh  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     35      1.1     eeh  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     36      1.1     eeh  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     37      1.1     eeh  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     38      1.1     eeh  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     39      1.1     eeh  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     40      1.1     eeh  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     41      1.1     eeh  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     42      1.1     eeh  * SUCH DAMAGE.
     43      1.1     eeh  *
     44      1.1     eeh  *	@(#)pcb.h	8.1 (Berkeley) 6/11/93
     45      1.1     eeh  */
     46      1.1     eeh 
     47      1.1     eeh #include <machine/reg.h>
     48      1.1     eeh 
     49      1.1     eeh #ifdef notyet
     50      1.1     eeh #define	PCB_MAXWIN	32	/* architectural limit */
     51      1.1     eeh #else
     52      1.1     eeh #define	PCB_MAXWIN	8	/* worried about u area sizes ... */
     53      1.1     eeh #endif
     54      1.1     eeh 
     55      1.1     eeh /*
     56      1.1     eeh  * SPARC Process Control Block.
     57      1.1     eeh  *
     58      1.1     eeh  * pcb_uw is positive if there are any user windows that are
     59      1.1     eeh  * are currently in the CPU windows rather than on the user
     60      1.1     eeh  * stack.  Whenever we are running in the kernel with traps
     61      1.1     eeh  * enabled, we decrement pcb_uw for each ``push'' of a CPU
     62      1.1     eeh  * register window into the stack, and we increment it for
     63      1.1     eeh  * each ``pull'' from the stack into the CPU.  (If traps are
     64      1.1     eeh  * disabled, or if we are in user mode, pcb_uw is junk.)
     65      1.1     eeh  *
     66      1.1     eeh  * To ease computing pcb_uw on traps from user mode, we keep track
     67      1.1     eeh  * of the log base 2 of the single bit that is set in %wim.
     68      1.1     eeh  *
     69      1.1     eeh  * If an overflow occurs while the associated user stack pages
     70      1.1     eeh  * are invalid (paged out), we have to store the registers
     71      1.1     eeh  * in a page that is locked in core while the process runs,
     72      1.1     eeh  * i.e., right here in the pcb.  We also need the stack pointer
     73      1.1     eeh  * for the last such window (but only the last, as the others
     74      1.1     eeh  * are in each window) and the count of windows saved.  We
     75      1.1     eeh  * cheat by having a whole window structure for that one %sp.
     76      1.1     eeh  * Thus, to save window pcb_rw[i] to memory, we write it at
     77      1.1     eeh  * pcb_rw[i + 1].rw_in[6].
     78      1.1     eeh  *
     79      1.1     eeh  * pcb_nsaved has three `kinds' of values.  If 0, it means no
     80      1.1     eeh  * registers are in the PCB (though if pcb_uw is positive,
     81      1.1     eeh  * there may be the next time you look).  If positive, it means
     82      1.1     eeh  * there are no user registers in the CPU, but there are some
     83      1.1     eeh  * saved in pcb_rw[].  As a special case, traps that needed
     84      1.1     eeh  * assistance to pull user registers from the stack also store
     85      1.1     eeh  * the registers in pcb_rw[], and set pcb_nsaved to -1.  This
     86      1.1     eeh  * special state is normally short-term: it can only last until the
     87      1.1     eeh  * trap returns, and it can never persist across entry to user code.
     88      1.1     eeh  */
     89      1.1     eeh /*
     90      1.1     eeh  * v9 addendum:
     91      1.1     eeh  *
     92      1.1     eeh  * Window handling between v8 and v9 has changed somewhat.  There
     93      1.1     eeh  * is no %wim.  Instead, we have a %cwp, %cansave, %canrestore,
     94      1.1     eeh  * %cleanwin, and %otherwin.  By definition:
     95      1.1     eeh  *
     96      1.1     eeh  *	 %cansave + %canrestore + %otherwin = NWINDOWS - 2
     97      1.1     eeh  *
     98      1.1     eeh  * In addition, %cleanwin >= %canrestore since restorable windows
     99      1.1     eeh  * are considered clean.  This means that by storing %canrestore
    100      1.1     eeh  * and %otherwin, we should be able to compute the values of all
    101      1.1     eeh  * the other registers.
    102      1.1     eeh  *
    103      1.1     eeh  * The only other register we need to save is %cwp because it cannot
    104      1.1     eeh  * be trivially computed from the other registers.  The %cwp is
    105      1.1     eeh  * stored in the %tstate register, but if the machine was in a register
    106      1.1     eeh  * window spill/fill handler, the value of that %cwp may be off by
    107      1.1     eeh  * as much as 2 register windows.  We will also store %cwp.  [We will
    108      1.1     eeh  * try to steal pcb_uw or pcb_nsaved for this purpose eventually.]
    109      1.1     eeh  *
    110      1.1     eeh  * To calculate what registers are in the pcb, start with pcb_cwp
    111      1.1     eeh  * and proceed to (pcb_cwp - pcb_canrestore) % NWINDOWS.  These should
    112      1.1     eeh  * be saved to their appropriate register windows.  The client routine
    113      1.1     eeh  * (trap handler) is responsible for saving pcb_cwp + 1 [%o1-%o7] in
    114      1.1     eeh  * the trap frame or on the stack.
    115      1.1     eeh  *
    116      1.1     eeh  *
    117      1.1     eeh  * Even more addendum:
    118      1.1     eeh  *
    119      1.1     eeh  * With the new system for keeping track of register windows we don't
    120      1.1     eeh  * care about anything other than pcb_uw which keeps track of how many
    121      1.1     eeh  * full windows we have.  As soon as a flush traps, we dump all user
    122      1.1     eeh  * windows to the pcb, handle the fault, then restore all user windows.
    123      1.1     eeh  *
    124      1.1     eeh  * XXX we are using pcb_nsaved as the counter.  pcb_uw is still a mask.
    125      1.1     eeh  * change this as soon as the new scheme is debugged.
    126      1.1     eeh  */
    127      1.1     eeh struct pcb {
    128      1.1     eeh 	int64_t	pcb_sp;		/* sp (%o6) when switch() was called */
    129      1.1     eeh 	int64_t	pcb_pc;		/* pc (%o7) when switch() was called */
    130      1.1     eeh 	caddr_t	pcb_onfault;	/* for copyin/out */
    131      1.1     eeh 	short	pcb_pstate;	/* %pstate when switch() was called -- may be useful if we support multiple memory models */
    132      1.1     eeh 	char	pcb_nsaved;	/* number of windows saved in pcb */
    133      1.1     eeh 
    134      1.1     eeh 	/* The rest is probably not needed except for pcb_rw */
    135      1.1     eeh 	char	pcb_cwp;	/* %cwp when switch() was called */
    136      1.1     eeh 	char	pcb_pil;	/* %pil when switch() was called -- prolly not needed */
    137      1.1     eeh 
    138  1.2.2.1  bouyer 	char	*lastcall;	/* DEBUG -- name of last system call */
    139      1.1     eeh 	/* the following MUST be aligned on a 64-bit boundary */
    140      1.1     eeh 	struct	rwindow64 pcb_rw[PCB_MAXWIN];	/* saved windows */
    141      1.1     eeh };
    142      1.1     eeh 
    143      1.1     eeh /*
    144      1.1     eeh  * The pcb is augmented with machine-dependent additional data for
    145      1.1     eeh  * core dumps.  Note that the trapframe here is a copy of the one
    146      1.1     eeh  * from the top of the kernel stack (included here so that the kernel
    147      1.1     eeh  * stack itself need not be dumped).
    148      1.1     eeh  */
    149  1.2.2.1  bouyer struct md_coredump32 {
    150      1.1     eeh 	struct	trapframe32 md_tf;
    151  1.2.2.1  bouyer 	struct	fpstate32 md_fpstate;
    152  1.2.2.1  bouyer };
    153  1.2.2.1  bouyer 
    154  1.2.2.1  bouyer struct md_coredump {
    155  1.2.2.1  bouyer 	struct	trapframe64 md_tf;
    156  1.2.2.1  bouyer 	struct	fpstate64 md_fpstate;
    157      1.1     eeh };
    158      1.1     eeh 
    159      1.1     eeh #ifdef _KERNEL
    160      1.1     eeh extern struct pcb *cpcb;
    161      1.2     eeh #else
    162      1.2     eeh /* Let gdb compile.  We need fancier macros to make these make sense. */
    163      1.2     eeh #define pcb_psr	pcb_pstate
    164      1.2     eeh #define pcb_wim	pcb_cwp
    165      1.1     eeh #endif /* _KERNEL */
    166