2020-09-27 18:04:08 -06:00
|
|
|
.global _start
|
|
|
|
|
.text
|
|
|
|
|
_start:
|
2020-10-03 13:49:14 -06:00
|
|
|
# NOTE: nop required because cpu currently does not detect when something is needed from a later stage of the pipeline.
|
2020-10-11 23:03:14 -06:00
|
|
|
# 4 clocks allows one instruction to finish before the next reads the regfile
|
|
|
|
|
|
|
|
|
|
# JAL
|
|
|
|
|
# JALR
|
|
|
|
|
|
2020-10-03 13:49:14 -06:00
|
|
|
# lui
|
2020-10-11 23:36:11 -06:00
|
|
|
lui x1, 0xfedcb # x1 = 0xfedcb000
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# addi
|
2020-10-11 23:36:11 -06:00
|
|
|
addi x1, x1, 0x789 # x1 = 0xfedcb789
|
|
|
|
|
addi x2, x0, -1 # x2 = 0xffffffff
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-11 23:36:11 -06:00
|
|
|
addi x3, x1, -0x777 # x3 = 0xfedcb012
|
2020-10-11 23:03:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-03 13:49:14 -06:00
|
|
|
|
|
|
|
|
# add
|
2020-10-11 23:36:11 -06:00
|
|
|
add x4, x1, x2 # x4 = 0xfedcb788
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# sub
|
2020-10-11 23:36:11 -06:00
|
|
|
sub x5, x1, x3 # x5 = 0x00000777
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# and
|
2020-10-11 23:36:11 -06:00
|
|
|
and x6, x1, x2 # x6 = 0xfedcb789
|
|
|
|
|
and x7, x1, x0 # x7 = 0x00000000
|
|
|
|
|
and x8, x4, x3 # x8 = 0xfedcb000
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# or
|
2020-10-11 23:36:11 -06:00
|
|
|
or x9, x1, x2 # x9 = 0xffffffff
|
2020-10-11 23:03:14 -06:00
|
|
|
or x10, x1, x0 # x10 = 0xfedcb789
|
|
|
|
|
or x11, x4, x3 # x11 = 0x0xfedcb79a
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
2020-10-11 23:03:14 -06:00
|
|
|
# xor
|
|
|
|
|
xor x12, x1, x2 # x12 = 0x01234876
|
|
|
|
|
xor x13, x1, x1 # x13 = 0x00000000
|
|
|
|
|
xor x14, x0, x2 # x14 = 0xffffffff
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# andi
|
|
|
|
|
andi x15, x2, -1348 # x15 = 0xfffffabc -1348 = 0xfffffabc
|
|
|
|
|
andi x16, x2, 0x123 # x16 = 0x00000123
|
|
|
|
|
andi x17, x1, -1645 # x17 = 0xfedcb181 -1645 = 0xfffff993
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
2020-10-11 23:06:29 -06:00
|
|
|
# ori
|
|
|
|
|
ori x18, x2, 0x000 # x18 = 0xffffffff
|
|
|
|
|
ori x19, x0, 0x768 # x19 = 0x768
|
|
|
|
|
ori x20, x1, 0x7ff # x20 = 0xfedcb7ff
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-11 23:03:14 -06:00
|
|
|
|
2020-10-11 23:09:08 -06:00
|
|
|
# xori
|
|
|
|
|
xori x21, x2, 0x123 # x21 = 0xfffffedc
|
|
|
|
|
xori x22, x1, 0x788 # x22 = 0xfedcb001
|
|
|
|
|
xori x23, x0, 0x788 # x23 = 0x00000788
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-03 13:49:14 -06:00
|
|
|
|
2020-10-11 23:36:11 -06:00
|
|
|
# slli
|
|
|
|
|
slli x24, x23, 4 # x24 = 0x00007880
|
|
|
|
|
slli x25, x2, 1 # x25 = 0xfffffffe
|
2020-10-16 18:25:10 -06:00
|
|
|
slli x26, x2, 63 # x26 = 0x80000000 # NOTE: gcc should not allow this since shamt is only 5 bits. discarding high bit so 63 = 31
|
2020-10-11 23:36:11 -06:00
|
|
|
slli x27, x2, 31 # x27 = 0x80000000
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# srli
|
|
|
|
|
srli x28, x23, 4 # x28 = 0x00000078
|
|
|
|
|
srli x29, x2, 1 # x29 = 0x7fffffff
|
2020-10-16 18:25:10 -06:00
|
|
|
srli x30, x2, 63 # x30 = 0x00000001 # NOTE: gcc should not allow this since shamt is only 5 bits. discarding high bit so 63 = 31
|
2020-10-11 23:36:11 -06:00
|
|
|
srli x3, x2, 31 # x3 = 0x00000001
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# srai
|
2020-10-16 18:25:10 -06:00
|
|
|
srai x4, x23, 4 # x4 = 0x00000078
|
|
|
|
|
srai x5, x2, 1 # x5 = 0xffffffff
|
|
|
|
|
srai x6, x2, 63 # x6 = 0xffffffff # NOTE: gcc should not allow this since shamt is only 5 bits. discarding high bit so 63 = 31
|
|
|
|
|
srai x7, x2, 31 # x7 = 0xffffffff
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# sll
|
|
|
|
|
addi x8, x0, 4 # x8 = 0x00000004
|
|
|
|
|
addi x9, x0, 1 # x9 = 0x00000001
|
|
|
|
|
addi x10, x0, 63 # x10 = 0x0000003f
|
|
|
|
|
addi x11, x0, 31 # x11 = 0x0000001f
|
|
|
|
|
sll x12, x23, x8 # x12 = 0x00007880 # 4
|
|
|
|
|
sll x13, x2, x9 # x13 = 0xfffffffe # 1
|
|
|
|
|
sll x14, x2, x10 # x14 = 0x80000000 # 63 = 31
|
|
|
|
|
sll x15, x2, x11 # x15 = 0x80000000 # 31
|
|
|
|
|
sll x16, x1, x0 # x16 = 0xfedcb789 # 0
|
|
|
|
|
sll x17, x1, x2 # x17 = 0x80000000 # -1=31
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# srl
|
|
|
|
|
srl x18, x23, x8 # x18 = 0x00000078 # 4
|
|
|
|
|
srl x19, x2, x9 # x17 = 0x7fffffff # 1
|
|
|
|
|
srl x20, x2, x10 # x20 = 0x00000001 # 63 = 31
|
|
|
|
|
srl x21, x2, x11 # x21 = 0x00000001 # 31
|
|
|
|
|
srl x22, x1, x0 # x22 = 0xfedcb789 # 0
|
|
|
|
|
srl x24, x1, x2 # x24 = 0x00000001 # -1=31
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# sra
|
|
|
|
|
sra x25, x23, x8 # x25 = 0x00000078 # 4
|
|
|
|
|
sra x26, x2, x9 # x26 = 0xffffffff # 1
|
|
|
|
|
sra x27, x2, x10 # x27 = 0xffffffff # 63 = 31
|
|
|
|
|
sra x28, x2, x11 # x28 = 0xffffffff # 31
|
|
|
|
|
sra x29, x1, x0 # x29 = 0xfedcb789 # 0
|
|
|
|
|
sra x30, x1, x2 # x30 = 0xffffffff # -1=31
|
2020-10-11 23:36:11 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-03 13:49:14 -06:00
|
|
|
|
2020-10-16 18:51:51 -06:00
|
|
|
# slti
|
|
|
|
|
addi x3, x0, 1 # x3 = 0x00000001
|
|
|
|
|
addi x4, x0, 0x010 # x4 = 0x00000010
|
|
|
|
|
addi x5, x0, 0x100 # x5 = 0x00000100
|
|
|
|
|
nop
|
|
|
|
|
sub x6, x0, x3 # x6 = 0xffffffff
|
|
|
|
|
sub x7, x0, x4 # x7 = 0xfffffff0
|
|
|
|
|
sub x8, x0, x5 # x7 = 0xffffff00
|
|
|
|
|
nop
|
|
|
|
|
slti x9, x3, 0 # x9 = 0x00000000
|
|
|
|
|
slti x10, x3, 1 # x10 = 0x00000000
|
|
|
|
|
slti x11, x3, 2 # x11 = 0x00000001
|
|
|
|
|
slti x12, x3, -1 # x12 = 0x00000000
|
|
|
|
|
slti x13, x7, 0 # x13 = 0x00000001
|
|
|
|
|
slti x14, x7, -17 # x14 = 0x00000000
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# sltiu
|
|
|
|
|
sltiu x15, x3, 0 # x15 = 0x00000000
|
|
|
|
|
sltiu x16, x3, 1 # x16 = 0x00000000
|
|
|
|
|
sltiu x17, x3, 2 # x17 = 0x00000001
|
|
|
|
|
sltiu x18, x3, -1 # x18 = 0x00000001 # -1=0xffffffff
|
|
|
|
|
sltiu x19, x7, 0 # x19 = 0x00000000
|
|
|
|
|
sltiu x20, x7, -15 # x20 = 0x00000001 # -15=0xfffffff1
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# slt
|
|
|
|
|
slt x21, x0, x3 # x21 = 0x00000001
|
|
|
|
|
slt x22, x3, x0 # x22 = 0x00000000
|
|
|
|
|
slt x23, x3, x3 # x23 = 0x00000000
|
|
|
|
|
slt x24, x3, x6 # x24 = 0x00000000
|
|
|
|
|
slt x25, x6, x3 # x25 = 0x00000001
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
|
|
|
|
# sltu
|
|
|
|
|
sltu x26, x0, x3 # x26 = 0x00000001
|
|
|
|
|
sltu x27, x3, x0 # x27 = 0x00000000
|
|
|
|
|
sltu x28, x3, x3 # x28 = 0x00000000
|
|
|
|
|
sltu x29, x3, x6 # x29 = 0x00000001
|
|
|
|
|
sltu x30, x6, x3 # x30 = 0x00000000
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
2020-10-16 18:59:25 -06:00
|
|
|
# auipc
|
|
|
|
|
auipc x3, 0 # x3 = pc + 0
|
|
|
|
|
auipc x4, 3 # x4 = pc + 0x3000
|
|
|
|
|
auipc x5, 0xfffff # x5 = pc + 0xfffff000
|
2020-11-06 23:18:37 -07:00
|
|
|
# TODO: verify auipc adds and does not concatenate (must have PC>0xfff for this)
|
2020-10-16 18:59:25 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
|
2020-10-16 18:51:51 -06:00
|
|
|
|
2020-10-11 23:03:14 -06:00
|
|
|
# counter and infinite loop
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-11 23:36:11 -06:00
|
|
|
addi x31, x0, 1 # x1 = 1
|
2020-09-27 18:04:08 -06:00
|
|
|
|
2020-09-27 18:38:35 -06:00
|
|
|
loop:
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-10-11 23:36:11 -06:00
|
|
|
addi x31, x31, 1 # increment x1
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-11-06 23:18:37 -07:00
|
|
|
jal x1, loop # loop forever
|
|
|
|
|
addi x2, x0, 0 # NOTE: this should never be executed
|
|
|
|
|
addi x3, x0, 0 # NOTE: this should never be executed
|
|
|
|
|
addi x4, x0, 0 # NOTE: this should never be executed
|
|
|
|
|
addi x5, x0, 0 # NOTE: this should never be executed
|
|
|
|
|
addi x6, x0, 0 # NOTE: this should never be executed
|
2020-10-03 13:49:14 -06:00
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
|
|
|
|
nop
|
2020-09-27 18:38:35 -06:00
|
|
|
|
2020-09-27 18:04:08 -06:00
|
|
|
.data
|
