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-   -   MIPS language question pls help.. (http://www.daniweb.com/forums/thread36875.html)

c21ahongyi Dec 17th, 2005 4:16 am
MIPS language question pls help..
 
address data
-------------------------
0xad 0x59
0xae 0xfa
0xaf 0x9d
oxb0 0xa6
0xb1 0x78
0xb2 0x04
oxb3 0xbc
oxb4 0x88
0xb8 0xff
the MIPS code:
addi $s1, $zero, 0xab
lb $t0, 5($s1)
lw $t1, 5($s1)
addi $s1, $s1, 11
lbu $t2, -8($s1)
lw $t3, -8($s1)

wat will the hexadecimal value be of registers $t0, $t1, $t2,$t3,after executing the above codes, if the system is using little-endian byte order?

andor Mar 15th, 2006 10:17 am
Re: MIPS language question pls help..
 
You can't load word
lw $t1, 5($s1)
becouse 5 isn't divisable with 4 so you also can't do this
addi $s1, $s1, 11
and then
lw $t3, -8($s1)
the rest is correct so $t0 is 0xFFFFFF9d and $t2 is 0x000000fa. For learning MIPS you can use SPIM (yes revers from MIPS) simulator.
Whole asm code
# FAKULTET TEHNICKIH NAUKA NOVI SAD 
# KATEDRA ZA RACUNARSKU TEHNIKU I MEDJURACUNARSKE KOMUNIKACIJE
#################################################
#                                                                text segment                                                                                #
#################################################

        .text               
        .globl main
       
main:                                                                                # ovde pocinje izvrsavanje
        la $s1, dat1
        lb $t0, 5($s1)
#        lw $t1, 5($s1) # greska (error)
        addi $s1, $s1, 11
        lbu $t2, -8($s1)
#        lw $t3, -8($s1) # error


#################################################
#                      segment podataka                      #
#################################################

        .data
dat1: .byte 0xad 0x59 0xae 0xfa 0xaf 0x9d 0xb0 0xa6 0xb1 0x78 0xb2 0x04 0xb3 0xbc 0xb4 0x88 0xb8 0xff

##
##


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