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Copy pathsimple_encode_manual.mips
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simple_encode_manual.mips
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# 32 bit mips
# ELF 32-bit MSB executable, MIPS, MIPS-I version 1, dynamically linked (uses
# shared libs), for GNU/Linux 4.10.8, with unknown capability 0x41000000 =
# 0xf676e75, with unknown capability 0x10000 = 0x70401, not stripped
#
# add
# sub
# and
# or
# slt
# addi
# beq
# j
# lw
# sw
# this is the first thing run on our processor. sp is already 0
# -------------------------------------------------------
# Modified 32 bit wide structure:
#
# 11 states
# 32 bits
# 4 16-bit registers
# 1 16-bit program counter
#
#
# Instruction | Function | Encoding | op | funct
# ------------------------------------------------------------------------------------------
# add $1, $2, $3 | addition: $1 <- $2 + $3 | R | 000000 | 100000
# sub $1, $2, $3 | subtraction: $1 <- $2 – $3 | R | 000000 | 100010
# and $1, $2, $3 | bitwise and: $1 <- $2 and $3 | R | 000000 | 100100
# or $1, $2, $3 | bitwise or: $1 <- $2 or $3 | R | 000000 | 100101
# slt $1, $2, $3 | set less than: $1 <- 1 if $2 < $3 | R | 000000 | 101010
# | $1 <- 0 otherwise
# sra $1, $2, $3 | shift right arith $1 <- $2 >>> $3 | R | 000000 | 000011
# sll $1, $2, $3 | shift left logic $1 <- $2 << $3 | R | 000000 | 000000
# addi $1, $2, imm | add immediate: $1 <- $2 + imm | I | 001000 | n/a
# beq $1, $2, imm | branch if equal: PC <- PC + imm × 4 | I | 000100 | n/a
# j destination | jump: PC <- destinationa | J | 000010 | n/a
# lw $1, imm($2) | load word: $1 <- mem[$2 + imm] | I | 100000 | n/a
# sw $1, imm($2) | store word: mem[$2 + imm] <- $1 | I | 101000 | n/a
#
#
# R (add $rd, $ra, $rb) 6 5 5 5 5 6
# 0 ra rb rd 0 funct
#
# I (beq $ra, $rb, imm) 6 5 5 16
# op ra rb imm
#
# J (j dest) 6 26
# op dest
#
# examples:
# * addi: 001000 aaaaa bbbbb iiiiiiii iiiiiiii
# * beq: 000100 aaaaa bbbbb iiiiiiii iiiiiiii
# * sw: 101000 aaaaa bbbbb iiiiiiii iiiiiiii
# * lw: 101000 aaaaa bbbbb iiiiiiii iiiiiiii
#
# * j: 000010 dd dddddddd dddddddd dddddddd
#
# * add: 000000 aaaaa bbbbb ddddd 00000 100000
Main:
addi $fp, $sp, 0
addi $2, $0, 60
sw $2, 12($fp)
sw $0, 16($fp)
lw $2, 12($fp)
addi $0, $0, 0 # no-op
addi $3, $2, 1
sw $3, 12($fp)
addi $3, $fp, 8
add $2, $3, $2
lw $2, 20($2)
addi $0, $0, 0 # no-op
sw $2, 8($fp)
j Whilecheck
addi $0, $0, 0 # no-op
Whilebody:
addi $2, $0, 7
sw $2, 20($fp)
j Forcheck
addi $0, $0, 0 # no-op
Forbody:
lw $2, 16($fp)
addi $0, $0, 0 # no-op
addi $2, $2, 1
addi $3, $fp, 8
add $2, $3, $2
lw $2, 120($2)
addi $0, $0, 0 # no-op
sw $2, 24($fp)
lw $2, 24($fp)
addi $0, $0, 0 # no-op
addi $7, $0, 0xfe
and $3, $2, $7
lw $4, 8($fp)
lw $2, 20($fp)
addi $0, $0, 0 # no-op
sra $2, $4, $2 # TODO
addi $7, $0, 0x1
and $2, $2, $7
or $2, $3, $2
sw $2, 24($fp)
lw $2, 24($fp)
addi $0, $0, 0 # no-op
sll $3, $2, 24 # TODO
sra $3, $3, 24 # TODO
lw $2, 16($fp)
addi $4, $fp, 8
add $2, $4, $2
sw $3, 120($2)
lw $2, 16($fp)
addi $0, $0, 0 # no-op
addi $2, $2, 1
sw $2, 16($fp)
lw $2, 20($fp)
addi $0, $0, 0 # no-op
addi $2, $2, -1
sw $2, 20($fp)
Forcheck:
lw $2, 20($fp)
addi $0, $0, 0 # no-op
slt $7, $0, $2
beq $7, $0, Forcheckcont1
j Forbody
Forcheckcont1:
addi $0, $0, 0 # no-op
lw $2, 12($fp)
addi $0, $0, 0 # no-op
addi $3, $2, 1
sw $3, 12($fp)
addi $3, $fp, 8
add $2, $3, $2
lw $2, 20($2)
addi $0, $0, 0 # no-op
sw $2, 8($fp)
Whilecheck:
lw $3, 12($fp)
addi $2, $0, 100
beq $3, $2, End
addi $0, $0, 0 # no-op
lw $3, 16($fp)
addi $2, $0, 1000
beq $3, $2, End
j Whilebody
End:
addi $0, $0, 0 # no-op
addi $2, $0, 0
addi $sp, $fp, 0