convert to DEC-style register names. the attempt to use function-based
register names was confusing, and could not _be_ correct in some cases. Also, add a couple of 'generic' instruction formats which should be used when decoding instructions before the specific format is known.
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cgd
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@ -1,4 +1,34 @@
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/* $NetBSD: db_instruction.h,v 1.4 1997/09/16 22:53:32 thorpej Exp $ */
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/* $NetBSD: db_instruction.h,v 1.5 1999/05/09 19:38:59 cgd Exp $ */
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/*
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* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
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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 Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Mach Operating System
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@ -46,11 +76,12 @@
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* All instructions are in one of five formats:
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* Memory, Branch, Operate, Floating-point Operate, PAL
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*
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* One minor departure from DEC's conventions is we use names
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* for registers that are more akin their software use, e.g.
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* rather then bluntly call them Ra/Rb/Rc we make clear which
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* one is a source (Rs) and which one is a destination (Rd).
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* When a second source register is defined we call it Rt.
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* The original Mach sources attempted to use 'smarter' names
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* for registers, which reflected source and destination. These
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* definitions use the names from the Architecture Reference Manual,
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* both for clarity and because you can't differentiate between
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* 'source' and 'destinations' for some types of instructions (loads
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* and stores; they'd be correct for one, but swapped for the other).
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*/
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@ -60,6 +91,15 @@ typedef union {
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*/
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unsigned int bits;
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/*
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* Generic instruction pseudo format; look at
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* opcode to see how to interpret the rest.
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*/
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struct {
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unsigned bits:26,
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opcode:6;
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} generic_format;
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/*
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* Memory instructions contain a 16 bit
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* signed immediate value and two register
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@ -67,8 +107,8 @@ typedef union {
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*/
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struct {
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signed short displacement;
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unsigned rs : 5,
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rd : 5,
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unsigned rb : 5,
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ra : 5,
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opcode : 6;
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} mem_format;
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@ -84,15 +124,15 @@ typedef union {
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*/
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struct {
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signed int displacement : 21;
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unsigned rd : 5,
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unsigned ra : 5,
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opcode : 6;
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} branch_format;
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struct {
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signed int hint : 14;
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unsigned action : 2,
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rs : 5,
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rd : 5,
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rb : 5,
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ra : 5,
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opcode : 6;
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} jump_format;
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@ -103,20 +143,31 @@ typedef union {
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* specifier. Bit 12 sez which is which.
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*/
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struct {
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unsigned rd : 5,
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unsigned rc : 5,
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function : 7,
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sbz : 4,
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rt : 5,
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rs : 5,
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is_lit : 1,
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sbz_or_litlo : 3,
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rb_or_lithi : 5,
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ra : 5,
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opcode : 6;
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} operate_generic_format;
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struct {
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unsigned rc : 5,
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function : 7,
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zero : 1,
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sbz : 3,
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rb : 5,
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ra : 5,
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opcode : 6;
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} operate_reg_format;
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struct {
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unsigned rd : 5,
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unsigned rc : 5,
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function : 7,
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one : 1,
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literal : 8,
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rs : 5,
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ra : 5,
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opcode : 6;
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} operate_lit_format;
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@ -126,10 +177,10 @@ typedef union {
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* uniform in the encoding. As for the semantics..
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*/
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struct {
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unsigned fd : 5,
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unsigned fc : 5,
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function : 11,
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ft : 5,
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fs : 5,
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fb : 5,
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fa : 5,
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opcode : 6;
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} float_format;
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