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ISA

Avatar for Chen Chen
October 17, 2022
Science
160
0

 ISA

Avatar for Chen

Chen

October 17, 2022

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Transcript

  1. 91 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFE0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1000 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 FFD4 FFD0 FFCC FFC8 FFC4 FFC0 FFBC Just did jal 1000

  2. 92 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFE0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1000 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 FFD4 FFD0 FFCC FFC8 FFC4 FFC0 FFBC $sp, $fp still describe caller’s frame

  3. 93 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1004 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 FFD4 FFD0 FFCC FFC8 FFC4 FFC0 FFBC Allocate space on stack

  4. 94 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1008 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 FFD4 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Save $fp

  5. 95 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 100C Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Save $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC

  6. 96 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1010 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Save $s0 Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC

  7. 97 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 2348 PC 0000 1014 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Setup $fp

  8. 98 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 2348 PC 0000 1014 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra $sp, $fp now describe new frame, ready to start Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC

  9. 99 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 5678 1235 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 2348 PC 0000 1018 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Do some computation..

  10. 100 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at 0000 0000 $v0 4242 4242 $v1 0000 8010 $a0 0000 1234 $a1 5678 0001 $a2 0000 0002 $a3 0000 0007 $t0 9999 999A $t1 0000 0000 $s0 5678 1235 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 101C PC 0000 4200 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Call another function (not pictured, takes no args) jal sets $ra, PC Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC

  11. 101 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 ???? ???? $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 ???? ???? $t1 ???? ???? $s0 ???? ???? $sp ???? ???? $fp ???? ???? $ra ???? ???? PC ???? ???? Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Other function can do what It wants to the regs as it computes And make a stack frame Of its own Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC

  12. 102 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 8675 3090 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 ???? ???? $t1 ???? ???? $s0 5678 1235 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 101C PC 0000 101C Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC But before it returns, it is responsible for restoring certain registers Including $sp and $fp, and $s0 Value returned in $v0

  13. 103 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 8675 3090 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 5678 1235 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 101C PC 0000 1020 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Do some more computation

  14. 104 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 5678 1235 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 101C PC 0000 1024 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Do some more computation (load addr not pictured)

  15. 105 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 101C PC 0000 1028 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Restore registers to return

  16. 106 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFDC $ra 0000 2348 PC 0000 102C Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Restore registers to return

  17. 107 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFD0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1030 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Restore registers to return

  18. 108 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFE0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1034 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Restore registers to return

  19. 109 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFE0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 1034 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Now $sp, $fp describe caller’s frame Restore registers to return

  20. 110 Execution Example: Calling With Frames Reg Value $0 0000

    0000 $at ???? ???? $v0 0001 0002 $v1 ???? ???? $a0 ???? ???? $a1 ???? ???? $a2 ???? ???? $a3 ???? ???? $t0 DCED 42C5 $t1 ???? ???? $s0 0042 0420 $sp 0000 FFE0 $fp 0000 FFF0 $ra 0000 2348 PC 0000 2348 Addr Instruction 1000 subiu $sp, $sp, 16 1004 sw $fp, 0($sp) 1008 sw $ra, 4($sp) 100C sw $s0, 8($sp) 1010 addiu $fp, $sp, 12 1014 add $s0, $a0, $a1 1018 jal 4200 101C add $t0, $v0, $s0 1020 lw $v0, 4($t0) 1024 lw $s0, -4($fp) 1028 lw $ra, -8($fp) 102C lw $fp, -12($fp) 1030 addiu $sp, $sp, 16 1034 jr $ra Addr Value FFF0 0001 0070 FFEC 1234 5678 FFE8 9999 9999 FFE4 0000 2568 FFE0 0001 0040 FFDC FFD8 0042 0420 FFD4 0000 2348 FFD0 0000 FFF0 FFCC FFC8 FFC4 FFC0 FFBC Return to caller (code not pictured)