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pcb.h revision 1.1.1.1.14.1
      1  1.1.1.1.14.1  wrstuden /*	$NetBSD: pcb.h,v 1.1.1.1.14.1 1999/12/27 18:33:58 wrstuden 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           1.1       eeh #ifdef notdef
    139           1.1       eeh 	int	pcb_winof;	/* number of window overflow traps */
    140           1.1       eeh 	int	pcb_winuf;	/* number of window underflow traps */
    141           1.1       eeh #endif
    142           1.1       eeh 	char*	lastcall;	/* DEBUG -- name of last system call */
    143           1.1       eeh 	/* the following MUST be aligned on a 64-bit boundary */
    144           1.1       eeh 	struct	rwindow64 pcb_rw[PCB_MAXWIN];	/* saved windows */
    145           1.1       eeh };
    146           1.1       eeh 
    147           1.1       eeh /*
    148           1.1       eeh  * The pcb is augmented with machine-dependent additional data for
    149           1.1       eeh  * core dumps.  Note that the trapframe here is a copy of the one
    150           1.1       eeh  * from the top of the kernel stack (included here so that the kernel
    151           1.1       eeh  * stack itself need not be dumped).
    152           1.1       eeh  */
    153  1.1.1.1.14.1  wrstuden struct md_coredump32 {
    154           1.1       eeh 	struct	trapframe32 md_tf;
    155  1.1.1.1.14.1  wrstuden 	struct	fpstate32 md_fpstate;
    156  1.1.1.1.14.1  wrstuden };
    157  1.1.1.1.14.1  wrstuden 
    158  1.1.1.1.14.1  wrstuden struct md_coredump {
    159  1.1.1.1.14.1  wrstuden 	struct	trapframe64 md_tf;
    160  1.1.1.1.14.1  wrstuden 	struct	fpstate64 md_fpstate;
    161  1.1.1.1.14.1  wrstuden };
    162  1.1.1.1.14.1  wrstuden 
    163  1.1.1.1.14.1  wrstuden /*
    164  1.1.1.1.14.1  wrstuden  * A core file consists of a header followed by a number of segments.
    165  1.1.1.1.14.1  wrstuden  * Each segment is preceeded by a `coreseg' structure giving the
    166  1.1.1.1.14.1  wrstuden  * segment's type, the virtual address where the bits resided in
    167  1.1.1.1.14.1  wrstuden  * process address space and the size of the segment.
    168  1.1.1.1.14.1  wrstuden  *
    169  1.1.1.1.14.1  wrstuden  * The core header specifies the lengths of the core header itself and
    170  1.1.1.1.14.1  wrstuden  * each of the following core segment headers to allow for any machine
    171  1.1.1.1.14.1  wrstuden  * dependent alignment requirements.
    172  1.1.1.1.14.1  wrstuden  */
    173  1.1.1.1.14.1  wrstuden 
    174  1.1.1.1.14.1  wrstuden struct core32 {
    175  1.1.1.1.14.1  wrstuden 	u_int32_t c_midmag;		/* magic, id, flags */
    176  1.1.1.1.14.1  wrstuden 	u_int16_t c_hdrsize;		/* Size of this header (machdep algn) */
    177  1.1.1.1.14.1  wrstuden 	u_int16_t c_seghdrsize;		/* Size of a segment header */
    178  1.1.1.1.14.1  wrstuden 	u_int32_t c_nseg;		/* # of core segments */
    179  1.1.1.1.14.1  wrstuden 	char	c_name[MAXCOMLEN+1];	/* Copy of p->p_comm */
    180  1.1.1.1.14.1  wrstuden 	u_int32_t c_signo;		/* Killing signal */
    181  1.1.1.1.14.1  wrstuden 	u_int	c_ucode;		/* Hmm ? */
    182  1.1.1.1.14.1  wrstuden 	u_int	c_cpusize;		/* Size of machine dependent segment */
    183  1.1.1.1.14.1  wrstuden 	u_int	c_tsize;		/* Size of traditional text segment */
    184  1.1.1.1.14.1  wrstuden 	u_int	c_dsize;		/* Size of traditional data segment */
    185  1.1.1.1.14.1  wrstuden 	u_int	c_ssize;		/* Size of traditional stack segment */
    186  1.1.1.1.14.1  wrstuden };
    187  1.1.1.1.14.1  wrstuden 
    188  1.1.1.1.14.1  wrstuden struct coreseg32 {
    189  1.1.1.1.14.1  wrstuden 	u_int32_t c_midmag;		/* magic, id, flags */
    190  1.1.1.1.14.1  wrstuden 	u_int	c_addr;			/* Virtual address of segment */
    191  1.1.1.1.14.1  wrstuden 	u_int	c_size;			/* Size of this segment */
    192           1.1       eeh };
    193           1.1       eeh 
    194           1.1       eeh #ifdef _KERNEL
    195           1.1       eeh extern struct pcb *cpcb;
    196  1.1.1.1.14.1  wrstuden #else
    197  1.1.1.1.14.1  wrstuden /* Let gdb compile.  We need fancier macros to make these make sense. */
    198  1.1.1.1.14.1  wrstuden #define pcb_psr	pcb_pstate
    199  1.1.1.1.14.1  wrstuden #define pcb_wim	pcb_cwp
    200           1.1       eeh #endif /* _KERNEL */
    201