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83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/* ssem_defs.h: Manchester University SSEM (Small Scale Experimental Machine)
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simulator definitions
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Based on the SIMH package written by Robert M Supnik
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Copyright (c) 2006-2013 Gerardo Ospina
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of the author shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from the author.
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This is not a supported product, but the author welcomes bug reports and fixes.
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Mail to ngospina@gmail.com
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*/
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#ifndef _SSEM_DEFS_H_
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#define _SSEM_DEFS_H_ 0
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#include "sim_defs.h" /* simulator defns */
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/* Simulator stop codes */
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#define STOP_STOP 1 /* STOP */
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#define STOP_IBKPT 2 /* breakpoint */
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/* Memory */
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#define MEMSIZE 32 /* memory size */
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#define AMASK 0x1F /* addr mask */
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/* Architectural constants */
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#define MMASK 0xFFFFFFFF /* memory mask */
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#define IMASK 0x0000E01F /* instruction mask */
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#define UMASK 0xFFFF1FE0 /* unused bits mask */
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#define SMASK 0x80000000 /* sign mask */
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/* Instruction format */
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#define I_M_OP 0x07 /* opcode */
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#define I_V_OP 13
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#define I_OP (I_M_OP << I_V_OP)
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#define I_GETOP(x) (((x) >> I_V_OP) & I_M_OP)
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#define I_M_EA AMASK /* address */
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#define I_V_EA 0
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#define I_EA (I_M_EA)
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#define I_GETEA(x) ((x) & I_M_EA)
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/* Unit flags */
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#define UNIT_V_SSEM (UNIT_V_UF + 0)
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#define UNIT_SSEM (1u << UNIT_V_SSEM)
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/* Instructions */
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enum opcodes {
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OP_JUMP_INDIRECT, OP_JUMP_INDIRECT_RELATIVE, OP_LOAD_NEGATED, OP_STORE,
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OP_SUBSTRACT, OP_UNDOCUMENTED, OP_TEST, OP_STOP
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};
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/* Prototypes */
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uint32 Read (uint32 ea);
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void Write (uint32 ea, uint32 dat);
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#endif
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