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POMIPS randomized word scrambler
 

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  1. POMIPS randomized word scrambler
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    <p>I am trying to write code that uses the MARS (my MIPS simulator) pseudorandom number generator to pick a random char in the string, take it out of memory and into a register, and replace that char in memory with an asterisk, '*'.</p> <p>So far, it only scrambles part of the word, and it's driving me insane. I can't find what in this code isn't working. I don't even need a direct answer, just hints/tips would be SO helpful. </p> <p>Here is the code:</p> <pre><code>#this loop extracts a char at random from a string in memory, stores it in a register, and replaces the char in the string with an asterisk '*' .data .align 2 string0: .ascii "Tyler\n" .align 2 endString: .asciiz "Loop completed!\n" .align 2 scrambleString: .asciiz .text #counter li $t0, 5 #pointer to string0 la $s0, string0 loop2: #is counter = 0? go to loop3 if so beq $t0, $0, loop3 #seed &amp; prepare randomized number generator li $v0, 30 syscall li $v0, 40 #sets seed syscall #generates random number in $a0, with the coUnter $t0 being the upper bound addi $a1, $t0, 1 li $v0, 42 syscall #add STRING POINTER by random number in $a0, store this new address in $t1 #addi $a0, $a0, 1 add $t1, $s0, $a0 #srlv $t1, $s0, $a0 #isolates that bytesized char, puts it into $t2 lbu $t2, ($t1) #beq $t2, 0x5c, loop2 #replaces char in original string with "*" li $t3, 0x2a sb $t3, ($t1) beq $t1, $t3, loop2 #decrement counter addi $t0, $t0, -1 #loop return j loop2 loop3: la $a0, string0 li $v0, 4 syscall li $v0, 10 syscall </code></pre>
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    1. COI have no knowledge of MIPS asm at all and do not know calling conventions used by syscall, but are you sure the $t0 and other temporary registers are preserved during syscall?
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