124 lines
5.1 KiB
C
124 lines
5.1 KiB
C
/* $NetBSD: pcb.h,v 1.3 1994/11/20 20:53:20 deraadt Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Lawrence Berkeley Laboratory.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)pcb.h 8.1 (Berkeley) 6/11/93
|
|
*/
|
|
|
|
#include <machine/reg.h>
|
|
|
|
#ifdef notyet
|
|
#define PCB_MAXWIN 32 /* architectural limit */
|
|
#else
|
|
#define PCB_MAXWIN 8 /* worried about u area sizes ... */
|
|
#endif
|
|
|
|
/*
|
|
* SPARC Process Control Block.
|
|
*
|
|
* pcb_uw is positive if there are any user windows that are
|
|
* are currently in the CPU windows rather than on the user
|
|
* stack. Whenever we are running in the kernel with traps
|
|
* enabled, we decrement pcb_uw for each ``push'' of a CPU
|
|
* register window into the stack, and we increment it for
|
|
* each ``pull'' from the stack into the CPU. (If traps are
|
|
* disabled, or if we are in user mode, pcb_uw is junk.)
|
|
*
|
|
* To ease computing pcb_uw on traps from user mode, we keep track
|
|
* of the log base 2 of the single bit that is set in %wim.
|
|
*
|
|
* If an overflow occurs while the associated user stack pages
|
|
* are invalid (paged out), we have to store the registers
|
|
* in a page that is locked in core while the process runs,
|
|
* i.e., right here in the pcb. We also need the stack pointer
|
|
* for the last such window (but only the last, as the others
|
|
* are in each window) and the count of windows saved. We
|
|
* cheat by having a whole window structure for that one %sp.
|
|
* Thus, to save window pcb_rw[i] to memory, we write it at
|
|
* pcb_rw[i + 1].rw_in[6].
|
|
*
|
|
* pcb_nsaved has three `kinds' of values. If 0, it means no
|
|
* registers are in the PCB (though if pcb_uw is positive,
|
|
* there may be the next time you look). If positive, it means
|
|
* there are no user registers in the CPU, but there are some
|
|
* saved in pcb_rw[]. As a special case, traps that needed
|
|
* assistance to pull user registers from the stack also store
|
|
* the registers in pcb_rw[], and set pcb_nsaved to -1. This
|
|
* special state is normally short-term: it can only last until the
|
|
* trap returns, and it can never persist across entry to user code.
|
|
*/
|
|
struct pcb {
|
|
int pcb_sp; /* sp (%o6) when switch() was called */
|
|
int pcb_pc; /* pc (%o7) when switch() was called */
|
|
int pcb_psr; /* %psr when switch() was called */
|
|
|
|
caddr_t pcb_onfault; /* for copyin/out */
|
|
|
|
int pcb_uw; /* user windows inside CPU */
|
|
int pcb_wim; /* log2(%wim) */
|
|
int pcb_nsaved; /* number of windows saved in pcb */
|
|
|
|
#ifdef notdef
|
|
int pcb_winof; /* number of window overflow traps */
|
|
int pcb_winuf; /* number of window underflow traps */
|
|
#endif
|
|
int pcb_pad; /* pad to doubleword boundary */
|
|
|
|
/* the following MUST be aligned on a doubleword boundary */
|
|
struct rwindow pcb_rw[PCB_MAXWIN]; /* saved windows */
|
|
};
|
|
|
|
/*
|
|
* The pcb is augmented with machine-dependent additional data for
|
|
* core dumps. Note that the trapframe here is a copy of the one
|
|
* from the top of the kernel stack (included here so that the kernel
|
|
* stack itself need not be dumped).
|
|
*/
|
|
struct md_coredump {
|
|
struct trapframe md_tf;
|
|
struct fpstate md_fpstate;
|
|
};
|
|
|
|
#ifdef KERNEL
|
|
extern struct pcb *cpcb;
|
|
#endif /* KERNEL */
|