This code should be Runnable on MARS (MIPS Assembler and Runtime Simulator) IDE Convert the following...
This code should be Runnable on MARS (MIPS Assembler and Runtime Simulator) IDE
Convert the following c code into mips
#include <stdio.h>
#include <string.h>
char cipherText[200] = "anything";
int countNumberOfCharInCipher(char*);
int countNumberOfCharInCipher(char* cText)
{
return strlen(cText);
}
int countSpaces(int numberOfChar, char input[])
{
int spaceCounter =0;
for(int i=0; i < numberOfChar; i++)
{
if(input[i] == 32)
spaceCounter++;
}
return spaceCounter;
}
void decrypt(int numberOfChar, int key, char * cipherText, char * plainText)
{
int j = 0;
int i =0;
int k = 0;
int reverseOrderedKey[4];
int n =4;
int c =0;
int d =0;
int testKey[4] = {1,2,3,4};
int orderedKey[4] = {0,0,0,0};
while(key)
{
// printf("key : %d\n", key % 10);
reverseOrderedKey[k] = key %10;
key /= 10;
k++;
}
for (c = n - 1, d = 0; c >= 0; c--, d++)
orderedKey[d] = reverseOrderedKey[c];
for ( j=0; j <= 4; j++)
{
for( i=0; i<numberOfChar; i++)
{{
plainText[i] = cipherText[i] - orderedKey[j];
}
j += 1;
if (j %4 == 0) j = 0;
}
if (i == strlen(cipherText)) break;
}
}
int main()
{
char decrypttStr[1000] = "main text ";
int numChar = countNumberOfCharInCipher(decrypttStr);
int bestSpaces =0;
int bestKey = 0;
char plainText[1000];
for (int key = 1000; key < 10000; key++)
{
decrypt(numChar, key, decrypttStr, plainText);
int numSpaces = countSpaces(numChar, plainText);
if (numSpaces > bestSpaces)
{
bestSpaces = numSpaces ;
bestKey = key ;
printf("numSpaces : %d, bestKey : %d, plainText : %s",numSpaces, bestKey, plainText);
printf("key : %d, numSpaces : %d\n", key, numSpaces);
}
}
}
Homework Answers
Here is the equivalent MIPS code:
.file 1 ""
.section .mdebug.abi32
.previous
.nan legacy
.module fp=32
.module nooddspreg
.abicalls
.text
.align 2
.globl countNumberOfCharInCipher
.set nomips16
.set nomicromips
.ent countNumberOfCharInCipher
.type countNumberOfCharInCipher,
@function
countNumberOfCharInCipher:
.frame $sp,0,$31
# vars= 0, regs= 0/0, args= 0, gp= 0
.mask 0x00000000,0
.fmask 0x00000000,0
.set noreorder
.cpload $25
.set nomacro
lw $25,%call16(strlen)($28)
nop
.reloc 1f,R_MIPS_JALR,strlen
1: jr $25
nop
.set macro
.set reorder
.end countNumberOfCharInCipher
.size countNumberOfCharInCipher,
.-countNumberOfCharInCipher
.align 2
.globl countSpaces
.set nomips16
.set nomicromips
.ent countSpaces
.type countSpaces, @function
countSpaces:
.frame $sp,0,$31
# vars= 0, regs= 0/0, args= 0, gp= 0
.mask 0x00000000,0
.fmask 0x00000000,0
.set noreorder
.set nomacro
move $6,$5
move $2,$0
$L3:
subu $3,$6,$5
slt $3,$3,$4
beq $3,$0,$L8
movz $31,$31,$0
nop
lb $3,0($6)
addiu $6,$6,1
xori $3,$3,0x20
sltu $3,$3,1
b $L3
addu $2,$2,$3
$L8:
j $31
nop
.set macro
.set reorder
.end countSpaces
.size countSpaces, .-countSpaces
.align 2
.globl decrypt
.set nomips16
.set nomicromips
.ent decrypt
.type decrypt, @function
decrypt:
.frame $sp,80,$31
# vars= 32, regs= 6/0, args= 16, gp= 8
.mask 0x801f0000,-4
.fmask 0x00000000,0
.set noreorder
.cpload $25
.set nomacro
addiu $sp,$sp,-80
addiu $2,$sp,40
li $3,10
# 0xa
sw $20,72($sp)
sw $18,64($sp)
movz $31,$31,$0
sw $17,60($sp)
.cprestore 16
sw $31,76($sp)
sw $19,68($sp)
sw $16,56($sp)
move $18,$4
move $17,$6
move $20,$7
$L10:
beq $5,$0,$L19
addiu $2,$2,4
bne $3,$0,1f
div $0,$5,$3
break 7
1:
mfhi $4
mflo $5
b $L10
sw $4,-4($2)
$L19:
lw $2,52($sp)
move $16,$0
sw $2,24($sp)
lw $2,48($sp)
addiu $19,$sp,24
sw $2,28($sp)
lw $2,44($sp)
nop
sw $2,32($sp)
lw $2,40($sp)
nop
sw $2,36($sp)
move $3,$20
$L21:
move $2,$17
$L17:
subu $4,$2,$17
slt $4,$4,$18
beq $4,$0,$L20
sll $4,$16,2
addu $4,$19,$4
lw $5,0($4)
lbu $4,0($2)
addiu $16,$16,1
subu $4,$4,$5
sb $4,0($3)
andi $4,$16,0x3
bne $4,$0,$L13
nop
move $16,$0
$L13:
addiu $2,$2,1
b $L17
addiu $3,$3,1
$L20:
lw $25,%call16(strlen)($28)
nop
.reloc 1f,R_MIPS_JALR,strlen
1: jalr $25
move $4,$17
lw $28,16($sp)
bgez $18,$L16
move $3,$18
move $3,$0
$L16:
beq $2,$3,$L9
addiu $16,$16,1
slt $2,$16,5
bne $2,$0,$L21
move $3,$20
$L9:
lw $31,76($sp)
lw $20,72($sp)
lw $19,68($sp)
lw $18,64($sp)
lw $17,60($sp)
lw $16,56($sp)
j $31
addiu $sp,$sp,80
.set macro
.set reorder
.end decrypt
.size decrypt, .-decrypt
.section
.rodata.str1.4,"aMS",@progbits,1
.align 2
$LC2:
.ascii "numSpaces : %d, bestKey : %d,
plainText : %s\000"
.align 2
$LC3:
.ascii "key : %d, numSpaces :
%d\012\000"
.rdata
.align 2
$LC1:
.ascii "main text \000"
.space 989
.section
.text.startup,"ax",@progbits
.align 2
.globl main
.set nomips16
.set nomicromips
.ent main
.type main, @function
main:
.frame $sp,2072,$31
# vars= 2000, regs= 9/0, args= 24, gp= 8
.mask 0x80ff0000,-4
.fmask 0x00000000,0
.set noreorder
.cpload $25
.set nomacro
addiu $sp,$sp,-2072
lw $5,%got($LC1)($28)
lw $25,%call16(memcpy)($28)
sw $18,2044($sp)
addiu $18,$sp,1032
movz $31,$31,$0
sw $31,2068($sp)
.cprestore 24
sw $23,2064($sp)
sw $22,2060($sp)
sw $21,2056($sp)
sw $20,2052($sp)
sw $19,2048($sp)
sw $16,2036($sp)
li $6,11
# 0xb
addiu $5,$5,%lo($LC1)
sw $17,2040($sp)
.reloc 1f,R_MIPS_JALR,memcpy
1: jalr $25
move $4,$18
lw $28,24($sp)
li $6,989
# 0x3dd
lw $25,%call16(memset)($28)
move $5,$0
.reloc 1f,R_MIPS_JALR,memset
1: jalr $25
addiu $4,$sp,1043
lw $28,24($sp)
move $4,$18
lw $25,%call16(strlen)($28)
nop
.reloc 1f,R_MIPS_JALR,strlen
1: jalr $25
li $16,1000
# 0x3e8
lw $28,24($sp)
move $23,$2
lw $20,%got($LC2)($28)
lw $21,%got($LC3)($28)
move $22,$0
addiu $19,$sp,32
addiu $20,$20,%lo($LC2)
addiu $21,$21,%lo($LC3)
$L24:
lw $25,%got(decrypt)($28)
move $7,$19
move $6,$18
move $5,$16
.reloc 1f,R_MIPS_JALR,decrypt
1: jalr $25
move $4,$23
lw $28,24($sp)
move $5,$19
lw $25,%got(countSpaces)($28)
nop
.reloc 1f,R_MIPS_JALR,countSpaces
1: jalr $25
move $4,$23
move $17,$2
slt $2,$22,$2
lw $28,24($sp)
beq $2,$0,$L23
move $7,$16
lw $25,%call16(__printf_chk)($28)
move $6,$17
move $5,$20
li $4,1
# 0x1
.reloc 1f,R_MIPS_JALR,__printf_chk
1: jalr $25
sw $19,16($sp)
lw $28,24($sp)
move $7,$17
lw $25,%call16(__printf_chk)($28)
move $6,$16
move $5,$21
.reloc 1f,R_MIPS_JALR,__printf_chk
1: jalr $25
li $4,1
# 0x1
lw $28,24($sp)
move $22,$17
$L23:
addiu $16,$16,1
li $2,10000
# 0x2710
bne $16,$2,$L24
move $2,$0
lw $31,2068($sp)
lw $23,2064($sp)
lw $22,2060($sp)
lw $21,2056($sp)
lw $20,2052($sp)
lw $19,2048($sp)
lw $18,2044($sp)
lw $17,2040($sp)
lw $16,2036($sp)
j $31
addiu $sp,$sp,2072
.set macro
.set reorder
.end main
.size main, .-main
.globl cipherText
.data
.align 2
.type cipherText, @object
.size cipherText, 200
cipherText:
.ascii "anything\000"
.space 191
.ident "GCC: (Ubuntu
7.4.0-1ubuntu1~18.04.1) 7.4.0 20180726"
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int findColumn(char);
int findDecRow(char, int);
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#include <stdlib.h>
char arr[26][26];
char message[22], key[22], emessage[22], retMessage[22];
int findRow(char);
int findColumn(char);
int findDecRow(char, int);
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