ce12_w08_hw6_sol

ce12_w08_hw6_sol - CMPE 12 Winter 2008 Homework 6: Due...

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CMPE 12 Winter 2008 Name: SOLUTIONS Homework 6: Due February 27 Email: .orig x3000 INIT: LD R0, var1 JSR FUN1 LD R0, var2 JSR FUN1 LD R0, var3 JSR FUN1 AND R1, R1, 0 MAIN: JSR FUN2 ADD R1, R0, 0 JSR FUN2 NOT R0, R0 ADD R0, R0, #1 ADD R1, R0, R1 JSR FUN2 ADD R1, R0, R1 ST R1, var4 HALT FUN1: LD R6, ObjP STR R0, R6, 0 ADD R6, R6, #1 ST R6, ObjP RET FUN2: LD R6, ObjP ADD R6, R6, #-1 LDR R0, R6, 0 ST R6, ObjP RET var1: .FILL x40 var2: .FILL x56 var3: .FILL #-31 var4: .FILL 0 ObjP: .FILL Obj Obj: .BLKW 5 .end 1) a) (12 pts) When the PC reaches MAIN , what are the values stored in x301F-x3024? ( ObjP = x301F) Memory Location Value x301F (ObjP) x3023 x3020 (Obj) X40 x3021 X56 x3022 #-31 x3023 0 x3024 0
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b) (3 pts) What is the value of var4 after this program is done executing? var4 = -31 – x56 + x40 = -53 or xFFCB or -x35 2) In this program, Obj is a 'stack' datastructure. Subroutine FUN1 is a 'push' function. a) (5 pts) What function is subroutine
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This note was uploaded on 01/06/2009 for the course CMPE 12 taught by Professor Diblas during the Fall '08 term at UCSC.

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ce12_w08_hw6_sol - CMPE 12 Winter 2008 Homework 6: Due...

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