.global _start .text _start: # NOTE: nop required because cpu currently does not detect when something is needed from a later stage of the pipeline. # 4 clocks allows one instruction to finish before the next reads the regfile # JAL # JALR # lui lui x1, 0xfedcb # x1 = 0xfedcb000 nop nop nop # addi addi x1, x1, 0x789 # x1 = 0xfedcb789 addi x2, x0, -1 # x2 = 0xffffffff nop nop addi x3, x1, -0x777 # x3 = 0xfedcb012 nop nop nop # add add x4, x1, x2 # x4 = 0xfedcb788 nop nop nop # sub sub x5, x1, x3 # x5 = 0x00000777 nop nop nop # and and x6, x1, x2 # x6 = 0xfedcb789 and x7, x1, x0 # x7 = 0x00000000 and x8, x4, x3 # x8 = 0xfedcb000 nop nop nop # or or x9, x1, x2 # x9 = 0xffffffff or x10, x1, x0 # x10 = 0xfedcb789 or x11, x4, x3 # x11 = 0x0xfedcb79a nop nop nop # 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 # ori ori x18, x2, 0x000 # x18 = 0xffffffff ori x19, x0, 0x768 # x19 = 0x768 ori x20, x1, 0x7ff # x20 = 0xfedcb7ff nop nop nop # xori xori x21, x2, 0x123 # x21 = 0xfffffedc xori x22, x1, 0x788 # x22 = 0xfedcb001 xori x23, x0, 0x788 # x23 = 0x00000788 nop nop nop # slli slli x24, x23, 4 # x24 = 0x00007880 slli x25, x2, 1 # x25 = 0xfffffffe slli x26, x2, 63 # x26 = 0x80000000 # NOTE: gcc should not allow this since shamt is only 5 bits. discarding high bit so 63 = 31 slli x27, x2, 31 # x27 = 0x80000000 nop nop nop # srli srli x28, x23, 4 # x28 = 0x00000078 srli x29, x2, 1 # x29 = 0x7fffffff srli x30, x2, 63 # x30 = 0x00000001 # NOTE: gcc should not allow this since shamt is only 5 bits. discarding high bit so 63 = 31 srli x3, x2, 31 # x3 = 0x00000001 nop nop nop # srai 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 nop nop nop # 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 # x8 = 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 # auipc auipc x3, 0 # x3 = pc + 0 auipc x4, 3 # x4 = pc + 0x3000 auipc x5, 0xfffff # x5 = pc + 0xfffff000 # TODO: verify auipc adds and does not concatenate (must have PC>0xfff for this) nop nop nop # jal jal x1, test_jalr nop nop nop # can I remove nops now? addi x6, x0, 0 # x6 = 0 nop nop nop addi x6, x0, 1 # x6 = 1 addi x7, x6, 1 # x7 = 2 addi x8, x6, 1 # x8 = 2 addi x9, x6, 1 # x9 = 2 test1: # TODO: redo these tests because my nop test messed it up # beq addi x30, x0, 1 # x30 = 1 addi x9, x8, 0 # x9 == x8 nop nop nop bne x0, x0, fail # 0 == 0 bne x9, x8, fail # x9 == x8 bne x7, x8, test2 # x7 != x8 j fail test2: # beq addi x30, x0, 2 # x30 = 2 beq x0, x8, fail # 0 != x8 beq x7, x8, fail # x7 != x8 beq x8, x9, test3 # x8 == x9 j fail test3: # counter and infinite loop nop nop nop addi x31, x0, 1 # x1 = 1 loop: nop nop nop addi x31, x31, 1 # increment x1 nop nop nop 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 nop nop nop nop nop nop # jalr test_jalr: addi x2, x0, 0x12 # x2 = 0x12 jalr x0, x1, 0 # return fail: nop nop nop jal x0, fail # loop forever nop nop nop nop nop nop .data