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练习题4.3 p.254

\sim\seq\seq-full.hcl文件内已经说的很清楚了哪些不能更改,哪些是题目要求更改的控制逻辑块.

依据家庭作业4.51的答案,在seq-full.hcl文件内更改对应的HCL描述即可 以下答案注释了#changed的就是更改部分

#/* $begin seq-all-hcl */
####################################################################
#  HCL Description of Control for Single Cycle Y86-64 Processor SEQ   #
#  Copyright (C) Randal E. Bryant, David R. O'Hallaron, 2010       #
###################################################################### Your task is to implement the iaddq instruction
## The file contains a declaration of the icodes
## for iaddq (IIADDQ)
## Your job is to add the rest of the logic to make it work####################################################################
#    C Include's.  Don't alter these                               #
####################################################################quote '#include <stdio.h>'
quote '#include "isa.h"'
quote '#include "sim.h"'
quote 'int sim_main(int argc, char *argv[]);'
quote 'word_t gen_pc(){return 0;}'
quote 'int main(int argc, char *argv[])'
quote '  {plusmode=0;return sim_main(argc,argv);}'####################################################################
#    Declarations.  Do not change/remove/delete any of these       #
######################################################################### Symbolic representation of Y86-64 Instruction Codes #############
wordsig INOP 	'I_NOP'
wordsig IHALT	'I_HALT'
wordsig IRRMOVQ	'I_RRMOVQ'
wordsig IIRMOVQ	'I_IRMOVQ'
wordsig IRMMOVQ	'I_RMMOVQ'
wordsig IMRMOVQ	'I_MRMOVQ'
wordsig IOPQ	'I_ALU'
wordsig IJXX	'I_JMP'
wordsig ICALL	'I_CALL'
wordsig IRET	'I_RET'
wordsig IPUSHQ	'I_PUSHQ'
wordsig IPOPQ	'I_POPQ'
# Instruction code for iaddq instruction
wordsig IIADDQ	'I_IADDQ'
##### Symbolic represenations of Y86-64 function codes                  #####
wordsig FNONE    'F_NONE'        # Default function code##### Symbolic representation of Y86-64 Registers referenced explicitly #####
wordsig RRSP     'REG_RSP'    	# Stack Pointer
wordsig RNONE    'REG_NONE'   	# Special value indicating "no register"##### ALU Functions referenced explicitly                            #####
wordsig ALUADD	'A_ADD'		# ALU should add its arguments##### Possible instruction status values                             #####
wordsig SAOK	'STAT_AOK'	# Normal execution
wordsig SADR	'STAT_ADR'	# Invalid memory address
wordsig SINS	'STAT_INS'	# Invalid instruction
wordsig SHLT	'STAT_HLT'	# Halt instruction encountered##### Signals that can be referenced by control logic ####################
##### Fetch stage inputs		#####
wordsig pc 'pc'				# Program counter
##### Fetch stage computations		#####
wordsig imem_icode 'imem_icode'		# icode field from instruction memory
wordsig imem_ifun  'imem_ifun' 		# ifun field from instruction memory
wordsig icode	  'icode'		# Instruction control code
wordsig ifun	  'ifun'		# Instruction function
wordsig rA	  'ra'			# rA field from instruction
wordsig rB	  'rb'			# rB field from instruction
wordsig valC	  'valc'		# Constant from instruction
wordsig valP	  'valp'		# Address of following instruction
boolsig imem_error 'imem_error'		# Error signal from instruction memory
boolsig instr_valid 'instr_valid'	# Is fetched instruction valid?##### Decode stage computations		#####
wordsig valA	'vala'			# Value from register A port
wordsig valB	'valb'			# Value from register B port##### Execute stage computations	#####
wordsig valE	'vale'			# Value computed by ALU
boolsig Cnd	'cond'			# Branch test##### Memory stage computations		#####
wordsig valM	'valm'			# Value read from memory
boolsig dmem_error 'dmem_error'		# Error signal from data memory####################################################################
#    Control Signal Definitions.                                   #
#################################################################################### Fetch Stage     #################################### Determine instruction code
word icode = [imem_error: INOP;1: imem_icode;		# Default: get from instruction memory
];# Determine instruction function
word ifun = [imem_error: FNONE;1: imem_ifun;		# Default: get from instruction memory
];bool instr_valid = icode in { INOP, IHALT, IRRMOVQ, IIRMOVQ, IRMMOVQ, IMRMOVQ,IOPQ, IJXX, ICALL, IRET, IPUSHQ, IPOPQ, IIADDQ};#changed# Does fetched instruction require a regid byte?
bool need_regids =icode in { IRRMOVQ, IOPQ, IPUSHQ, IPOPQ, IIRMOVQ, IRMMOVQ, IMRMOVQ , IIADDQ};#changed# Does fetched instruction require a constant word?
bool need_valC =icode in { IIRMOVQ, IRMMOVQ, IMRMOVQ, IJXX, ICALL , IIADDQ}};#changed################ Decode Stage    ##################################### What register should be used as the A source?
word srcA = [icode in { IRRMOVQ, IRMMOVQ, IOPQ, IPUSHQ  } : rA;icode in { IPOPQ, IRET } : RRSP;1 : RNONE; # Don't need register
];## What register should be used as the B source?
word srcB = [icode in { IOPQ, IRMMOVQ, IMRMOVQ, IIADDQ  } : rB;#changedicode in { IPUSHQ, IPOPQ, ICALL, IRET } : RRSP;1 : RNONE;  # Don't need register
];## What register should be used as the E destination?
word dstE = [icode in { IRRMOVQ } && Cnd : rB;icode in { IIRMOVQ, IOPQ, IIADDQ} : rB;#changedicode in { IPUSHQ, IPOPQ, ICALL, IRET } : RRSP;1 : RNONE;  # Don't write any register
];## What register should be used as the M destination?
word dstM = [icode in { IMRMOVQ, IPOPQ } : rA;1 : RNONE;  # Don't write any register
];################ Execute Stage   ##################################### Select input A to ALU
word aluA = [icode in { IRRMOVQ, IOPQ } : valA;icode in { IIRMOVQ, IRMMOVQ, IMRMOVQ , IIADDQ} : valC;#changedicode in { ICALL, IPUSHQ } : -8;icode in { IRET, IPOPQ } : 8;# Other instructions don't need ALU
];## Select input B to ALU
word aluB = [icode in { IRMMOVQ, IMRMOVQ, IOPQ, ICALL, IPUSHQ, IRET, IPOPQ , IIADDQ} : valB;#changedicode in { IRRMOVQ, IIRMOVQ } : 0;# Other instructions don't need ALU
];## Set the ALU function
word alufun = [icode == IOPQ : ifun;1 : ALUADD;
];## Should the condition codes be updated?
bool set_cc = icode in { IOPQ , IIADDQ};#changed################ Memory Stage    ##################################### Set read control signal
bool mem_read = icode in { IMRMOVQ, IPOPQ, IRET };## Set write control signal
bool mem_write = icode in { IRMMOVQ, IPUSHQ, ICALL };## Select memory address
word mem_addr = [icode in { IRMMOVQ, IPUSHQ, ICALL, IMRMOVQ } : valE;icode in { IPOPQ, IRET } : valA;# Other instructions don't need address
];## Select memory input data
word mem_data = [# Value from registericode in { IRMMOVQ, IPUSHQ } : valA;# Return PCicode == ICALL : valP;# Default: Don't write anything
];## Determine instruction status
word Stat = [imem_error || dmem_error : SADR;!instr_valid: SINS;icode == IHALT : SHLT;1 : SAOK;
];################ Program Counter Update ############################## What address should instruction be fetched atword new_pc = [# Call.  Use instruction constanticode == ICALL : valC;# Taken branch.  Use instruction constanticode == IJXX && Cnd : valC;# Completion of RET instruction.  Use value from stackicode == IRET : valM;# Default: Use incremented PC1 : valP;
];
#/* $end seq-all-hcl */