161 lines
6.9 KiB
C
161 lines
6.9 KiB
C
/* $NetBSD: pcb.h,v 1.1.1.1 1998/06/20 04:58:52 eeh 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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/*
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* v9 addendum:
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*
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* Window handling between v8 and v9 has changed somewhat. There
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* is no %wim. Instead, we have a %cwp, %cansave, %canrestore,
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* %cleanwin, and %otherwin. By definition:
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*
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* %cansave + %canrestore + %otherwin = NWINDOWS - 2
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*
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* In addition, %cleanwin >= %canrestore since restorable windows
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* are considered clean. This means that by storing %canrestore
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* and %otherwin, we should be able to compute the values of all
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* the other registers.
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*
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* The only other register we need to save is %cwp because it cannot
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* be trivially computed from the other registers. The %cwp is
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* stored in the %tstate register, but if the machine was in a register
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* window spill/fill handler, the value of that %cwp may be off by
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* as much as 2 register windows. We will also store %cwp. [We will
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* try to steal pcb_uw or pcb_nsaved for this purpose eventually.]
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*
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* To calculate what registers are in the pcb, start with pcb_cwp
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* and proceed to (pcb_cwp - pcb_canrestore) % NWINDOWS. These should
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* be saved to their appropriate register windows. The client routine
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* (trap handler) is responsible for saving pcb_cwp + 1 [%o1-%o7] in
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* the trap frame or on the stack.
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*
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*
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* Even more addendum:
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*
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* With the new system for keeping track of register windows we don't
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* care about anything other than pcb_uw which keeps track of how many
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* full windows we have. As soon as a flush traps, we dump all user
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* windows to the pcb, handle the fault, then restore all user windows.
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*
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* XXX we are using pcb_nsaved as the counter. pcb_uw is still a mask.
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* change this as soon as the new scheme is debugged.
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*/
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struct pcb {
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int64_t pcb_sp; /* sp (%o6) when switch() was called */
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int64_t pcb_pc; /* pc (%o7) when switch() was called */
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caddr_t pcb_onfault; /* for copyin/out */
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short pcb_pstate; /* %pstate when switch() was called -- may be useful if we support multiple memory models */
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char pcb_nsaved; /* number of windows saved in pcb */
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/* The rest is probably not needed except for pcb_rw */
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char pcb_cwp; /* %cwp when switch() was called */
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char pcb_pil; /* %pil when switch() was called -- prolly not needed */
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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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char* lastcall; /* DEBUG -- name of last system call */
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/* the following MUST be aligned on a 64-bit boundary */
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struct rwindow64 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 trapframe32 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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