Annotation of sys/arch/sparc/include/pcb.h, Revision 1.1.1.1
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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