Annotation of sys/arch/sparc/include/pcb.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: pcb.h,v 1.5 2003/06/02 23:27:54 millert Exp $ */
! 2: /* $NetBSD: pcb.h,v 1.4 1995/03/28 18:19:56 jtc Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1992, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * This software was developed by the Computer Systems Engineering group
! 9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
! 10: * contributed to Berkeley.
! 11: *
! 12: * All advertising materials mentioning features or use of this software
! 13: * must display the following acknowledgement:
! 14: * This product includes software developed by the University of
! 15: * California, Lawrence Berkeley Laboratory.
! 16: *
! 17: * Redistribution and use in source and binary forms, with or without
! 18: * modification, are permitted provided that the following conditions
! 19: * are met:
! 20: * 1. Redistributions of source code must retain the above copyright
! 21: * notice, this list of conditions and the following disclaimer.
! 22: * 2. Redistributions in binary form must reproduce the above copyright
! 23: * notice, this list of conditions and the following disclaimer in the
! 24: * documentation and/or other materials provided with the distribution.
! 25: * 3. Neither the name of the University nor the names of its contributors
! 26: * may be used to endorse or promote products derived from this software
! 27: * without specific prior written permission.
! 28: *
! 29: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 30: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 31: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 32: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 33: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 34: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 35: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 36: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 37: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 38: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 39: * SUCH DAMAGE.
! 40: *
! 41: * @(#)pcb.h 8.1 (Berkeley) 6/11/93
! 42: */
! 43:
! 44: #ifndef _SPARC_PCB_H_
! 45: #define _SPARC_PCB_H_
! 46:
! 47: #include <machine/reg.h>
! 48:
! 49: #ifdef notyet
! 50: #define PCB_MAXWIN 32 /* architectural limit */
! 51: #else
! 52: #define PCB_MAXWIN 8 /* worried about u area sizes ... */
! 53: #endif
! 54:
! 55: /*
! 56: * SPARC Process Control Block.
! 57: *
! 58: * pcb_uw is positive if there are any user windows that are
! 59: * are currently in the CPU windows rather than on the user
! 60: * stack. Whenever we are running in the kernel with traps
! 61: * enabled, we decrement pcb_uw for each ``push'' of a CPU
! 62: * register window into the stack, and we increment it for
! 63: * each ``pull'' from the stack into the CPU. (If traps are
! 64: * disabled, or if we are in user mode, pcb_uw is junk.)
! 65: *
! 66: * To ease computing pcb_uw on traps from user mode, we keep track
! 67: * of the log base 2 of the single bit that is set in %wim.
! 68: *
! 69: * If an overflow occurs while the associated user stack pages
! 70: * are invalid (paged out), we have to store the registers
! 71: * in a page that is locked in core while the process runs,
! 72: * i.e., right here in the pcb. We also need the stack pointer
! 73: * for the last such window (but only the last, as the others
! 74: * are in each window) and the count of windows saved. We
! 75: * cheat by having a whole window structure for that one %sp.
! 76: * Thus, to save window pcb_rw[i] to memory, we write it at
! 77: * pcb_rw[i + 1].rw_in[6].
! 78: *
! 79: * pcb_nsaved has three `kinds' of values. If 0, it means no
! 80: * registers are in the PCB (though if pcb_uw is positive,
! 81: * there may be the next time you look). If positive, it means
! 82: * there are no user registers in the CPU, but there are some
! 83: * saved in pcb_rw[]. As a special case, traps that needed
! 84: * assistance to pull user registers from the stack also store
! 85: * the registers in pcb_rw[], and set pcb_nsaved to -1. This
! 86: * special state is normally short-term: it can only last until the
! 87: * trap returns, and it can never persist across entry to user code.
! 88: */
! 89: struct pcb {
! 90: int pcb_sp; /* sp (%o6) when switch() was called */
! 91: int pcb_pc; /* pc (%o7) when switch() was called */
! 92: int pcb_psr; /* %psr when switch() was called */
! 93:
! 94: caddr_t pcb_onfault; /* for copyin/out */
! 95:
! 96: int pcb_uw; /* user windows inside CPU */
! 97: int pcb_wim; /* log2(%wim) */
! 98: int pcb_nsaved; /* number of windows saved in pcb */
! 99:
! 100: #ifdef notdef
! 101: int pcb_winof; /* number of window overflow traps */
! 102: int pcb_winuf; /* number of window underflow traps */
! 103: #endif
! 104: u_int32_t pcb_wcookie; /* StackGhost cookie (must be unsigned) */
! 105:
! 106: /* the following MUST be aligned on a doubleword boundary */
! 107: struct rwindow pcb_rw[PCB_MAXWIN]; /* saved windows */
! 108: };
! 109:
! 110: /*
! 111: * The pcb is augmented with machine-dependent additional data for
! 112: * core dumps. Note that the trapframe here is a copy of the one
! 113: * from the top of the kernel stack (included here so that the kernel
! 114: * stack itself need not be dumped).
! 115: */
! 116: struct md_coredump {
! 117: struct trapframe md_tf;
! 118: struct fpstate md_fpstate;
! 119: u_int32_t md_wcookie;
! 120: };
! 121:
! 122: #ifdef _KERNEL
! 123: extern struct pcb *cpcb;
! 124: #endif /* _KERNEL */
! 125:
! 126: #endif
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