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################################################################################ # opcode.s -- MIPS opcode tester for xxx project #------------------------------------------------------------------------------- # ORIGINAL AUTHOR: Steve Rhoads (rhoadss@yahoo.com) -- 1/10/01 # # This file is an edited version of 'opcodes.asm', which is part of the Plasma # project (http://opencores.org/project,plasma). # COPYRIGHT: Software placed into the public domain by the original author. # Software 'as is' without warranty. Author liable for nothing. #------------------------------------------------------------------------------- # This assembly file tests all of the opcodes supported by the xxx core. # This test assumes that address 0x20000000 is the UART write register. # Successful tests will print out "A" or "AB" or "ABC" or .... # Missing letters or letters out of order indicate a failure. #------------------------------------------------------------------------------- # The core supports all the MIPS-I instructions, except for MULT* and DIV*. # C code needs to be compiled with the "-mno-mul" flag and linked with 'math.c'. # NOTE: the regular gcc compiler (v xxx) does NOT support this option! #------------------------------------------------------------------------------- # Summary of differences to original code: # # 1.- MUL* or DIV* are not implemented so that part has been commented out. # 2.- Plasma does not need a 'delay slot' after a L* before the result is used, # unlike the conventional MIPS-I architecture. In this code NOPs have been # inserted where necessary so that it works whether or not the core has load # delay slots (as opposed to load interlock). This means that this code # can't be used to validate load interlock implementation. # ################################################################################ # Set to >0 to test unaligned loads and/or stores .set TEST_UNALIGNED_LOADS, 0 .set TEST_UNALIGNED_STORES, 0 .text .align 2 .globl entry .ent entry entry: .set noreorder la $gp, _gp #initialize stack pointer la $4, __bss_start #$4 = .sbss_start la $5, _end #$5 = .bss_end nop #no stack needed nop b StartTest nop #nops required to place ISR at 0x3c nop OS_AsmPatchValue: #Code to place at address 0x3c lui $26, 0x1000 ori $26, $26, 0x3c jr $26 nop .org 0x3c InterruptVector: # Address=0x3c mfc0 $26,$14 # C0_EPC=14 (Exception PC) jr $26 add $4,$4,5 StartTest: mtc0 $0,$12 # disable interrupts lui $20,0x2000 # serial port write address ori $21,$0,'\n' # <CR> character ori $22,$0,'X' # 'X' letter ori $23,$0,'\r' ori $24,$0,0x0f80 # temp memory sb $23,0($20) sb $21,0($20) sb $23,0($20) sb $21,0($20) sb $23,0($20) sb $21,0($20) sb $23,0($20) sb $21,0($20) #Patch interrupt vector to 0x1000003c la $5, OS_AsmPatchValue sub $6,$5,0x1000 blez $6,NoPatch nop #lw $6, 0($5) #sw $6, 0x3c($0) #lw $6, 4($5) #sw $6, 0x40($0) #lw $6, 8($5) #sw $6, 0x44($0) #lw $6, 12($5) #sw $6, 0x48($0) NoPatch: ###################################### #Arithmetic Instructions ###################################### ArthmeticTest: ori $2,$0,'A' sb $2,0($20) ori $2,$0,'r' sb $2,0($20) ori $2,$0,'i' sb $2,0($20) ori $2,$0,'t' sb $2,0($20) ori $2,$0,'h' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: ADD ori $2,$0,'a' sb $2,0($20) ori $3,$0,5 ori $4,$0,60 add $2,$3,$4 sb $2,0($20) #A sb $23,0($20) sb $21,0($20) #b: ADDI ori $2,$0,'b' sb $2,0($20) ori $4,$0,60 addi $2,$4,5 sb $2,0($20) #A sb $23,0($20) sb $21,0($20) #c: ADDIU ori $2,$0,'c' sb $2,0($20) ori $4,$0,50 addiu $5,$4,15 sb $5,0($20) #A sb $23,0($20) sb $21,0($20) #d: ADDU ori $2,$0,'d' sb $2,0($20) ori $3,$0,5 ori $4,$0,60 add $2,$3,$4 sb $2,0($20) #A sb $23,0($20) sb $21,0($20) # DIV not implemented so skip div test # FIXME skip conditionaly j skip_div_test nop #e: DIV ori $2,$0,'e' sb $2,0($20) ori $2,$0,65*117+41 ori $3,$0,117 div $2,$3 nop mflo $4 sb $4,0($20) #A mfhi $4 addi $4,$4,66-41 sb $4,0($20) #B li $2,-67*19 ori $3,$0,19 div $2,$3 nop mflo $4 sub $4,$0,$4 sb $4,0($20) #C ori $2,$0,68*23 li $3,-23 div $2,$3 nop mflo $4 sub $4,$0,$4 sb $4,0($20) #D li $2,-69*13 li $3,-13 div $2,$3 mflo $4 sb $4,0($20) #E sb $23,0($20) sb $21,0($20) #f: DIVU ori $2,$0,'f' sb $2,0($20) ori $2,$0,65*13 ori $3,$0,13 divu $2,$3 nop mflo $4 sb $4,0($20) #A sb $23,0($20) sb $21,0($20) skip_div_test: # MUL not implemented so skip mul test # FIXME skip conditionaly j skip_mult_test nop #g: MULT ori $2,$0,'g' sb $2,0($20) ori $2,$0,5 ori $3,$0,13 mult $2,$3 nop mflo $4 sb $4,0($20) #A li $2,-5 ori $3,$0,13 mult $2,$3 mfhi $5 mflo $4 sub $4,$0,$4 addu $4,$4,$5 addi $4,$4,2 sb $4,0($20) #B ori $2,$0,5 li $3,-13 mult $2,$3 mfhi $5 mflo $4 sub $4,$0,$4 addu $4,$4,$5 addi $4,$4,3 sb $4,0($20) #C li $2,-5 li $3,-13 mult $2,$3 mfhi $5 mflo $4 addu $4,$4,$5 addi $4,$4,3 sb $4,0($20) #D lui $4,0xfe98 ori $4,$4,0x62e5 lui $5,0x6 ori $5,0x8db8 mult $4,$5 mfhi $6 addiu $7,$6,2356+1+'E' #E sb $7,0($20) sb $23,0($20) sb $21,0($20) #h: MULTU ori $2,$0,'h' sb $2,0($20) ori $2,$0,5 ori $3,$0,13 multu $2,$3 nop mflo $4 sb $4,0($20) #A sb $23,0($20) sb $21,0($20) skip_mult_test: #i: SLT ori $2,$0,'i' sb $2,0($20) ori $2,$0,10 ori $3,$0,12 slt $4,$2,$3 addi $5,$4,64 sb $5,0($20) #A slt $4,$3,$2 addi $5,$4,66 sb $5,0($20) #B li $2,0xfffffff0 slt $4,$2,$3 addi $5,$4,66 sb $5,0($20) #C slt $4,$3,$2 addi $5,$4,68 sb $5,0($20) #D li $3,0xffffffff slt $4,$2,$3 addi $5,$4,68 sb $5,0($20) #E slt $4,$3,$2 addi $5,$4,70 sb $5,0($20) #F sb $23,0($20) sb $21,0($20) #j: SLTI ori $2,$0,'j' sb $2,0($20) ori $2,$0,10 slti $4,$2,12 addi $5,$4,64 sb $5,0($20) #A slti $4,$2,8 addi $5,$4,66 sb $5,0($20) #B sb $23,0($20) sb $21,0($20) #k: SLTIU ori $2,$0,'k' sb $2,0($20) ori $2,$0,10 sltiu $4,$2,12 addi $5,$4,64 sb $5,0($20) #A sltiu $4,$2,8 addi $5,$4,66 sb $5,0($20) #B sb $23,0($20) sb $21,0($20) #l: SLTU ori $2,$0,'l' sb $2,0($20) ori $2,$0,10 ori $3,$0,12 slt $4,$2,$3 addi $5,$4,64 sb $5,0($20) #A slt $4,$3,$2 addi $5,$4,66 sb $5,0($20) #B sb $23,0($20) sb $21,0($20) #m: SUB ori $2,$0,'m' sb $2,0($20) ori $3,$0,70 ori $4,$0,5 sub $2,$3,$4 sb $2,0($20) #A sb $23,0($20) sb $21,0($20) #n: SUBU ori $2,$0,'n' sb $2,0($20) ori $3,$0,70 ori $4,$0,5 sub $2,$3,$4 sb $2,0($20) #A sb $23,0($20) sb $21,0($20) ###################################### #Branch and Jump Instructions ###################################### BranchTest: ori $2,$0,'B' sb $2,0($20) ori $2,$0,'r' sb $2,0($20) ori $2,$0,'a' sb $2,0($20) ori $2,$0,'n' sb $2,0($20) ori $2,$0,'c' sb $2,0($20) ori $2,$0,'h' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: B ori $2,$0,'a' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' b $B1 sb $10,0($20) sb $22,0($20) $B1: sb $11,0($20) sb $23,0($20) sb $21,0($20) #b: BAL ori $2,$0,'b' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $15,$0,'X' bal $BAL1 sb $10,0($20) sb $13,0($20) b $BAL2 sb $14,0($20) sb $15,0($20) $BAL1: sb $11,0($20) jr $31 sb $12,0($20) sb $22,0($20) $BAL2: sb $23,0($20) sb $21,0($20) #c: BEQ ori $2,$0,'c' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $2,$0,100 ori $3,$0,123 ori $4,$0,123 beq $2,$3,$BEQ1 sb $10,0($20) sb $11,0($20) beq $3,$4,$BEQ1 sb $12,0($20) sb $22,0($20) $BEQ1: sb $13,0($20) sb $23,0($20) sb $21,0($20) #d: BGEZ ori $2,$0,'d' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' or $15,$0,'X' ori $2,$0,100 li $3,0xffff1234 ori $4,$0,123 bgez $3,$BGEZ1 sb $10,0($20) sb $11,0($20) bgez $2,$BGEZ1 sb $12,0($20) sb $22,0($20) $BGEZ1: bgez $0,$BGEZ2 nop sb $15,0($20) $BGEZ2: sb $13,0($20) sb $23,0($20) sb $21,0($20) #e: BGEZAL ori $2,$0,'e' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $15,$0,'X' li $3,0xffff1234 bgezal $3,$BGEZAL1 nop sb $10,0($20) bgezal $0,$BGEZAL1 nop sb $13,0($20) b $BGEZAL2 sb $14,0($20) sb $15,0($20) $BGEZAL1: sb $11,0($20) jr $31 sb $12,0($20) sb $22,0($20) $BGEZAL2: sb $23,0($20) sb $21,0($20) #f: BGTZ ori $2,$0,'f' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $2,$0,100 li $3,0xffff1234 bgtz $3,$BGTZ1 sb $10,0($20) sb $11,0($20) bgtz $2,$BGTZ1 sb $12,0($20) sb $22,0($20) $BGTZ1: sb $13,0($20) sb $23,0($20) sb $21,0($20) #g: BLEZ ori $2,$0,'g' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $2,$0,100 li $3,0xffff1234 blez $2,$BLEZ1 sb $10,0($20) sb $11,0($20) blez $3,$BLEZ1 sb $12,0($20) sb $22,0($20) $BLEZ1: blez $0,$BLEZ2 nop sb $22,0($20) $BLEZ2: sb $13,0($20) sb $23,0($20) sb $21,0($20) #h: BLTZ ori $2,$0,'h' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $2,$0,100 li $3,0xffff1234 ori $4,$0,0 bltz $2,$BLTZ1 sb $10,0($20) sb $11,0($20) bltz $3,$BLTZ1 sb $12,0($20) sb $22,0($20) $BLTZ1: bltz $4,$BLTZ2 nop sb $13,0($20) $BLTZ2: sb $14,0($20) sb $23,0($20) sb $21,0($20) #i: BLTZAL ori $2,$0,'i' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $15,$0,'X' li $3,0xffff1234 bltzal $0,$BLTZAL1 nop sb $10,0($20) bltzal $3,$BLTZAL1 nop sb $13,0($20) b $BLTZAL2 sb $14,0($20) sb $15,0($20) $BLTZAL1: sb $11,0($20) jr $31 sb $12,0($20) sb $22,0($20) $BLTZAL2: sb $23,0($20) sb $21,0($20) #j: BNE ori $2,$0,'j' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $2,$0,100 ori $3,$0,123 ori $4,$0,123 bne $3,$4,$BNE1 sb $10,0($20) sb $11,0($20) bne $2,$3,$BNE1 sb $12,0($20) sb $22,0($20) $BNE1: sb $13,0($20) sb $23,0($20) sb $21,0($20) #k: J ori $2,$0,'k' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $15,$0,'X' j $J1 sb $10,0($20) sb $15,0($20) $J1: sb $11,0($20) sb $23,0($20) sb $21,0($20) #l: JAL ori $2,$0,'l' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $15,$0,'X' jal $JAL1 sb $10,0($20) sb $13,0($20) b $JAL2 sb $14,0($20) sb $15,0($20) $JAL1: sb $11,0($20) jr $31 sb $12,0($20) sb $22,0($20) $JAL2: sb $23,0($20) sb $21,0($20) #m: JALR ori $2,$0,'m' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $12,$0,'C' ori $13,$0,'D' ori $14,$0,'E' ori $15,$0,'X' la $3,$JALR1 jalr $3 sb $10,0($20) sb $13,0($20) b $JALR2 sb $14,0($20) sb $15,0($20) $JALR1: sb $11,0($20) jr $31 sb $12,0($20) sb $22,0($20) $JALR2: sb $23,0($20) sb $21,0($20) #n: JR ori $2,$0,'n' sb $2,0($20) ori $10,$0,'A' ori $11,$0,'B' ori $15,$0,'X' la $3,$JR1 jr $3 sb $10,0($20) sb $15,0($20) $JR1: sb $11,0($20) sb $23,0($20) sb $21,0($20) #o: NOP ori $2,$0,'o' sb $2,0($20) ori $2,$0,65 nop sb $2,0($20) sb $23,0($20) sb $21,0($20) # b LoadTest BreakTest: #p: BREAK ori $2,$0,'p' sb $2,0($20) ori $2,$0,'z' ori $4,$0,59 break 0 addi $4,$4,1 sb $4,0($20) sb $23,0($20) sb $21,0($20) #q: SYSCALL ori $2,$0,'q' sb $2,0($20) ori $4,$0,61 syscall 0 addi $4,$4,-1 sb $4,0($20) sb $23,0($20) sb $21,0($20) ###################################### #Load, Store, and Memory Control Instructions ###################################### LoadTest: ori $2,$0,'L' sb $2,0($20) ori $2,$0,'o' sb $2,0($20) ori $2,$0,'a' sb $2,0($20) ori $2,$0,'d' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: LB ori $2,$0,'a' sb $2,0($20) or $2,$0,$24 li $3,0x414243fc sw $3,16($2) # 16($2) = 0x414243fc lb $4,16($2) # $4 = 0x41 sb $4,0($20) # UART = 0x41 lb $4,17($2) # $4 = 0x42 nop sb $4,0($20) # UART = 0x42 lb $4,18($2) # $4 = 0x43 nop sb $4,0($20) # UART = 0x43 lb $2,19($2) # $2 = 0xffff.fffc nop sra $3,$2,8 # $3 = 0xffff.ffff addi $3,$3,0x45 # $3 = 0x44 sb $3,0($20) # UART = 0x44 addi $2,$2,0x49 # $4 = 0x45, overflow sb $2,0($20) # UART = 0x45 sb $23,0($20) # UART = CR sb $21,0($20) # UART = LF #b: LBU ori $2,$0,'b' sb $2,0($20) or $2,$0,$24 li $3,0x41424344 sw $3,16($2) lb $4,16($2) sb $4,0($20) lb $4,17($2) sb $4,0($20) lb $4,18($2) sb $4,0($20) lb $2,19($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) #c: LH ori $2,$0,'c' sb $2,0($20) or $2,$0,$24 li $3,0x00410042 sw $3,16($2) lh $4,16($2) sb $4,0($20) lh $2,18($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) #d: LHU ori $2,$0,'d' sb $2,0($20) or $2,$0,$24 li $3,0x00410042 sw $3,16($2) lh $4,16($2) sb $4,0($20) lh $2,18($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) #e: LW ori $2,$0,'e' sb $2,0($20) or $2,$0,$24 li $3,'A' sw $3,16($2) ori $3,$0,0 lw $2,16($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) .ifgt TEST_UNALIGNED_LOADS #f: LWL & LWR ori $2,$0,'f' sb $2,0($20) or $2,$0,$24 li $3,'A' sw $3,16($2) ori $3,$0,0 lwl $2,16($2) lwr $2,16($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) .endif #g: SB ori $2,$0,'g' sb $2,0($20) ori $2,$0,'A' sb $2,0($20) sb $23,0($20) sb $21,0($20) #h: SH ori $2,$0,'h' sb $2,0($20) or $4,$0,$24 ori $2,$0,0x4142 sh $2,16($4) lb $3,16($4) sb $3,0($20) lb $2,17($4) sb $2,0($20) sb $23,0($20) sb $21,0($20) #i: SW ori $2,$0,'i' sb $2,0($20) or $2,$0,$24 li $3,0x41424344 sw $3,16($2) lb $4,16($2) sb $4,0($20) lb $4,17($2) sb $4,0($20) lb $4,18($2) sb $4,0($20) lb $2,19($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) .ifgt TEST_UNALIGNED_STORES #j: SWL & SWR ori $2,$0,'j' sb $2,0($20) or $2,$0,$24 li $3,0x41424344 swl $3,16($2) swr $3,16($2) lb $4,16($2) sb $4,0($20) lb $4,17($2) sb $4,0($20) lb $4,18($2) sb $4,0($20) lb $2,19($2) sb $2,0($20) sb $23,0($20) sb $21,0($20) .endif ###################################### #Logical Instructions ###################################### LogicalTest: ori $2,$0,'L' sb $2,0($20) ori $2,$0,'o' sb $2,0($20) ori $2,$0,'g' sb $2,0($20) ori $2,$0,'i' sb $2,0($20) ori $2,$0,'c' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: AND ori $2,$0,'a' sb $2,0($20) ori $2,$0,0x0741 ori $3,$0,0x60f3 and $4,$2,$3 sb $4,0($20) sb $23,0($20) sb $21,0($20) #b: ANDI ori $2,$0,'b' sb $2,0($20) ori $2,$0,0x0741 andi $4,$2,0x60f3 sb $4,0($20) sb $23,0($20) sb $21,0($20) #c: LUI ori $2,$0,'c' sb $2,0($20) lui $2,0x41 srl $3,$2,16 sb $3,0($20) sb $23,0($20) sb $21,0($20) #d: NOR ori $2,$0,'d' sb $2,0($20) li $2,0xf0fff08e li $3,0x0f0f0f30 nor $4,$2,$3 sb $4,0($20) sb $23,0($20) sb $21,0($20) #e: OR ori $2,$0,'e' sb $2,0($20) ori $2,$0,0x40 ori $3,$0,0x01 or $4,$2,$3 sb $4,0($20) sb $23,0($20) sb $21,0($20) #f: ORI ori $2,$0,'f' sb $2,0($20) ori $2,$0,0x40 ori $4,$2,0x01 sb $4,0($20) sb $23,0($20) sb $21,0($20) #g: XOR ori $2,$0,'g' sb $2,0($20) ori $2,$0,0xf043 ori $3,$0,0xf002 xor $4,$2,$3 sb $4,0($20) sb $23,0($20) sb $21,0($20) #h: XORI ori $2,$0,'h' sb $2,0($20) ori $2,$0,0xf043 xor $4,$2,0xf002 sb $4,0($20) sb $23,0($20) sb $21,0($20) ###################################### #Move Instructions ###################################### MoveTest: ori $2,$0,'M' sb $2,0($20) ori $2,$0,'o' sb $2,0($20) ori $2,$0,'v' sb $2,0($20) ori $2,$0,'e' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: MFHI ori $2,$0,'a' sb $2,0($20) ori $2,$0,65 mthi $2 mfhi $3 sb $3,0($20) sb $23,0($20) sb $21,0($20) #b: MFLO ori $2,$0,'b' sb $2,0($20) ori $2,$0,65 mtlo $2 mflo $3 sb $3,0($20) sb $23,0($20) sb $21,0($20) #c: MTHI ori $2,$0,'c' sb $2,0($20) ori $2,$0,65 mthi $2 mfhi $3 sb $3,0($20) sb $23,0($20) sb $21,0($20) #d: MTLO ori $2,$0,'d' sb $2,0($20) ori $2,$0,65 mtlo $2 mflo $3 sb $3,0($20) sb $23,0($20) sb $21,0($20) ###################################### #Shift Instructions ###################################### ShiftTest: ori $2,$0,'S' sb $2,0($20) ori $2,$0,'h' sb $2,0($20) ori $2,$0,'i' sb $2,0($20) ori $2,$0,'f' sb $2,0($20) ori $2,$0,'t' sb $2,0($20) sb $23,0($20) sb $21,0($20) #a: SLL ori $2,$0,'a' sb $2,0($20) li $2,0x40414243 sll $3,$2,8 srl $3,$3,24 sb $3,0($20) sb $23,0($20) sb $21,0($20) #b: SLLV ori $2,$0,'b' sb $2,0($20) li $2,0x40414243 ori $3,$0,8 sllv $3,$2,$3 srl $3,$3,24 sb $3,0($20) sb $23,0($20) sb $21,0($20) #c: SRA ori $2,$0,'c' sb $2,0($20) li $2,0x40414243 sra $3,$2,16 sb $3,0($20) li $2,0x84000000 sra $3,$2,25 sub $3,$3,0x80 sb $3,0($20) sb $23,0($20) sb $21,0($20) #d: SRAV ori $2,$0,'d' sb $2,0($20) li $2,0x40414243 ori $3,$0,16 srav $3,$2,$3 sb $3,0($20) ori $3,$0,25 li $2,0x84000000 srav $3,$2,$3 sub $3,$3,0x80 sb $3,0($20) sb $23,0($20) sb $21,0($20) #e: SRL ori $2,$0,'e' sb $2,0($20) li $2,0x40414243 srl $3,$2,16 sb $3,0($20) li $2,0x84000000 srl $3,$2,25 sb $3,0($20) sb $23,0($20) sb $21,0($20) #f: SRLV ori $2,$0,'f' sb $2,0($20) li $2,0x40414243 ori $3,$0,16 srlv $4,$2,$3 sb $4,0($20) ori $3,$0,25 li $2,0x84000000 srlv $3,$2,$3 sb $3,0($20) sb $23,0($20) sb $21,0($20) ori $2,$0,'D' sb $2,0($20) ori $2,$0,'o' sb $2,0($20) ori $2,$0,'n' sb $2,0($20) ori $2,$0,'e' sb $2,0($20) sb $23,0($20) sb $21,0($20) $DONE: j $DONE nop .set reorder .end entry
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