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umach.h
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/*************************************************************************
* umach.h
* Define the uMachine enumerations, structures and operations.
*************************************************************************/
#ifndef uMACH_H
#define uMACH_H
/* uMachine characteristics (registers, ram, code, labels) */
#define registerCount (11)
#define stackRegister (registerCount-1)
#define ramSize (1024)
#define codeSize (1024)
#define psrSize (1)
#define labelCount (1024)
#define undefinedLabel (-labelCount)
#include "uvalues.h"
/*************************************************************************
* Note: NOT CURRENTLY USED
* Program Status Registers(PSR) bits
* 0. COMPARE BIT - 0 if equal, 1 if not equal
*-----------------------------------------------------------------------
* Defines enums to index into the uPSR.
************************************************************************/
typedef enum {
mCompare,
} uSTATUS;
/*************************************************************************
* uCode addressing modes...
* -1. NONE (internal mode for error detection)
*
* 0. IMMEDIATE [ #n ] - a constant
* 1. REGISTER [ Dn ] - a register's contents
* 2. INDEXED [ m(Dn)] - address = Dn + m
* 3. INDIRECT [@m(Dn)] - address = contents of (Dn + m)
* 4. LABEL [ Ln ] - a label
*------------------------------------------------------------------------
* Stack addressing modes
* SP can be used to access the stack pointer in an addressing mode.
*************************************************************************/
typedef enum {
mNone = -1,
mImmediate, mRegister, mIndexed, mIndirect, mLabel,
} uMODE;
/*************************************************************************
* uCode opcodes...
* END instruction
* internal opcode for error detection
*
* HALT instruction
* HLT ; Terminate program execution
*
* I/O instructions
* RD dst ; Read an integer value into dst from STDIN
* RDF dst ; Read a float value into dst from STDIN
* RDS dst ; Read a string value into dst from STDIN
* WRT src ; Write the value in src to STDOUT
* WRTS ; Performs POP A WRT A
* WRTLN src ; Write the value in src followed by a newline to STDOUT
* WRTLNS ; Performs POP A WRTLN A
*
* MEMORY instructions
* MOV src dst ; Performs dst <-- src
* -INTEGER
* NEG src dst ; Performs dst <-- -src
* ADD src1 src2 dst ; Performs dst <-- src1 + src2
* SUB src1 src2 dst ; Performs dst <-- src1 - src2
* MUL src1 src2 dst ; Performs dst <-- src1 x src2
* DIV src1 src2 dst ; Performs dst <-- src1 / src2
* MOD src1 src2 dst ; Peroforms dst <-- src1 % src2
* -FLOAT
* NEGF src dst ; Performs dst <-- -src
* ADDF src1 src2 dst ; Performs dst <-- src1 + src2
* SUBF src1 src2 dst ; Performs dst <-- src1 - src2
* MULF src1 src2 dst ; Performs dst <-- src1 x src2
* DIVF src1 src2 dst ; Performs dst <-- src1 / src2
* -CASTING
* CASTI src dst ; Performs dst <-- (int) src
* CASTF src dst ; Performs dst <-- (float) src
*
* STACK instructions
* PUSH src ; Push src on top of the stack
* POP dst ; Pop the top of the stack into dst
* -INTEGER
* NEGS ; Performs POP A PUSH -A
* ADDS ; Performs POP A POP B PUSH B + A
* SUBS ; Performs POP A POP B PUSH B - A
* MULS ; Performs POP A POP B PUSH B x A
* DIVS ; Performs POP A POP B PUSH B / A
* MODS ; Performs POP A POP B PUSH B % A
* -FLOAT
* NEGSF ; Performs POP A PUSH -A
* ADDSF ; Performs POP A POP B PUSH B + A
* SUBSF ; Performs POP A POP B PUSH B - A
* MULSF ; Performs POP A POP B PUSH B x A
* DIVSF ; Performs POP A POP B PUSH B / A
* -CASTING
* CASTSI ; Performs POP A PUSH (int)A
* CASTSF ; Performs POP A PUSH (float)A
*
* LABEL instruction
* Ln: ; Drop label n at current position
*
* LOGICAL OPERATOR instructions
* ANDS ; Performs POP A POP B PUSH B and A
* ORS ; Performs POP A POP B PUSH B or A
* NOTS ; Performs POP A PUSH not A
*
* COMPARE instructions
* -INTEGER
* CMPEQS ; Performs POP A POP B PUSH B = A
* CMPGES ; Performs POP A POP B PUSH B >= A
* CMPGTS ; Performs POP A POP B PUSH B > A
* CMPLES ; Performs POP A POP B PUSH B <= A
* CMPLTS ; Performs POP A POP B PUSH B < A
* CMPNES ; Performs POP A POP B PUSH B <> A
* -FLOAT
* CMPEQSF ; Performs POP A POP B PUSH B = A
* CMPGESF ; Performs POP A POP B PUSH B >= A
* CMPGTSF ; Performs POP A POP B PUSH B > A
* CMPLESF ; Performs POP A POP B PUSH B <= A
* CMPLTSF ; Performs POP A POP B PUSH B < A
* CMPNESF ; Performs POP A POP B PUSH B <> A
* STACK BRANCH instructions
* BRTS Ln ; Performs POP A BEQ A #1 Ln
* BRFS Ln ; Performs POP A BEQ A #0 Ln
*
* BRANCH instructions
* BR Ln ; Branch to label n
* -INTEGER
* BEQ src1 src2 Ln ; Branch to label n if src1 = src2
* BGE src1 src2 Ln ; Branch to label n if src1 >= src2
* BGT src1 src2 Ln ; Branch to label n if src1 > src2
* BLE src1 src2 Ln ; Branch to label n if src1 <= src2
* BLT src1 src2 Ln ; Branch to label n if src1 < src2
* BNE src1 src2 Ln ; Branch to label n if src1 <> src2
* -FLOAT
* BEQF src1 src2 Ln ; Branch to label n if src1 = src2
* BGEF src1 src2 Ln ; Branch to label n if src1 >= src2
* BGTF src1 src2 Ln ; Branch to label n if src1 > src2
* BLEF src1 src2 Ln ; Branch to label n if src1 <= src2
* BLTF src1 src2 Ln ; Branch to label n if src1 < src2
* BNEF src1 src2 Ln ; Branch to label n if src1 <> src2
*
* SUBROUTINE instructions
* CALL Ln ; Performs PUSH PC BR Ln
* RET ; Performs POP PC
*
* DEBUG instructions
* PRTS ; Prints stack
* PRTR ; Prints registers
*************************************************************************/
typedef enum {
oEND = -1,
oHLT ,
oRD , oRDF , oRDS, oWRT , oWRTS, oWRTLN, oWRTLNS,
oMOV , oNEG , oADD , oSUB , oMUL , oDIV , oMOD,
oNEGF , oADDF , oSUBF , oMULF , oDIVF , oMODF,
oCASTI, oCASTF,
oPUSH, oPOP , oNEGS, oADDS, oSUBS, oMULS, oDIVS, oMODS,
oNEGSF, oADDSF, oSUBSF, oMULSF, oDIVSF,
oCASTSI, oCASTSF,
oLAB ,
oANDS, oORS, oNOTS,
oCMPEQS, oCMPGES, oCMPGTS, oCMPLES, oCMPLTS, oCMPNES,
oCMPEQSF, oCMPGESF, oCMPGTSF, oCMPLESF, oCMPLTSF, oCMPNESF,
oBRTS, oBRFS,
oBR , oBEQ , oBGE , oBGT , oBLE , oBLT , oBNE ,
oBEQF , oBGEF , oBGTF , oBLEF , oBLTF , oBNEF ,
oCALL, oRET,
oPRTS, oPRTR
} uOPCODE;
/*************************************************************************
* Operand structure (mode, register, value)
*************************************************************************/
typedef struct {
uMODE Mode;
int Register;
//int Value;
uVALUE Value;
} uOPERAND;
/*************************************************************************
* Instruction structure (source text, line number, opcode, operands)
*************************************************************************/
typedef struct {
char *Text;
int Line;
uOPCODE Opcode;
uOPERAND Operand[3];
} uINSTRUCTION;
/*************************************************************************
* Set operand value
*************************************************************************/
int getOperandValue(uOPERAND op, uVALUE *val);
int setOperandValue(uOPERAND *op, int val);
int setOperandValue(uOPERAND *op, float val);
int setOperandValue(uOPERAND *op, char* val);
/*************************************************************************
* uMachine reset (initialization)
*************************************************************************/
void uReset(void);
/*************************************************************************
* Storage access routines (registers, ram, psr and stack)
*************************************************************************/
int psrFetch(int reg, int *val); //Note: Not currently used...
int psrStore(int reg, int val); //Note: Not currently used...
int registerFetch(int reg, uVALUE *val);
int registerStore(int reg, uVALUE val);
int ramFetch(uVALUE addr, uVALUE *val);
int ramStore(uVALUE addr, uVALUE val);
int stackFetch(uVALUE *val);
int stackStore(uVALUE val);
/************************************************************************
* Outputting stack and registers - used error reporting and debugging.
************************************************************************/
void printStack(FILE* out);
void dumpRegisters(FILE* out);
#endif /* uMACH_H */