opcodes.asm

Plasma IP Core 你可以利用这个组件在FPGA中设计MIPS结构的CPU

##################################################################
# TITLE: Opcode Tester
# AUTHOR: Steve Rhoads ([e-mail])
# DATE CREATED: 1/10/02
# FILENAME: opcodes.asm
# PROJECT: Plasma CPU core
# COPYRIGHT: Software placed into the public domain by the author.
#    Software 'as is' without warranty.  Author liable for nothing.
# DESCRIPTION:
#    This assembly file tests all of the opcodes supported by the
#    Plasma 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.
##################################################################
	.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

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> letter
   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
   
   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)

   #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)

   #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)

   #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)