error: “store address not aligned on word boundary”

Are you sure that the error is happening on that line? I think the error is actually happening here:

sw  $t3, 0($t0)

The problem is that you’re trying to store a word (because you’re using sw) to an address that’s not word-aligned. 0xFFFF0011 is not word-aligned. The reason why 0xFFFF0010 works is because it is word-aligned.

A word is 4 bytes long, so the valid word-aligned addresses are 0xFFFF0010, 0xFFFF0014, 0xFFFF0018, etc. Anything in between isn’t word-aligned.

You should be able to fix this by changing it from sw to sb:

sb  $t3, 0($t0)

This works because storing a byte does not require a word-aligned address.

Edit: To clarify, a word-aligned address is one that’s divisible by 4.

Related Posts:

  1. MIPS – Fetch address not aligned on word boundary
  2. Reading and printing an integer in mips
  3. MIPS Address out of range (MARS)
  4. What is the use of a $zero register in MIPS?
  5. Dynamic vs Static instruction count
  6. Attempt to execute non-instruction in mips assembler?
  7. Why shift a bit using sll and such in MIPs Assembly?
  8. Understanding how `lw` and `sw` actually work in a MIPS program
  9. MIPS architecture syscall instruction
  10. MIPS: lw (load word) instruction
  11. MIPS fetch address not aligned on word boundary, used .align 4, still no go
  12. Loading and storing bytes in MIPS
  13. Converting a C program to MIPS
  14. MIPS assembly for a simple for loop
  15. While Loop in Mips (New to Mips)
  16. what does .space do in mips?
  17. mips .word function and differences between 2 codes
  18. Why doesn’t there exists a subi opcode for MIPS?
  19. Mips how to store user input string
  20. What exactly does the lb instruction do?
  21. What is the difference between la and li in opcodes in MIPS?
  22. Bubble sort algorithm in MIPS
  23. How do I correctly use the mod operator in MIPS?
  24. what is the use of ori in this part of MIPS code?
  25. Storing a user’s input in MIPS
  26. MIPS ‘nor’ usage in code
  27. Integer absolute value in MIPS?
  28. MIPS Assembly – lui $t0, 4097?
  29. Difference between “move” and “li” in MIPS assembly language
  30. Greater than, less than equal, greater than equal in MIPS
  31. is there is a compiler which convert c++ code into mips assembly language
  32. MIPS program jr $ra instructions and stack handling
  33. Multiplying a register value by a constant in MIPS?
  34. Arithmetic Overflow in mips
  35. Subtract two input numbers
  36. Assembly language (MIPS) difference betweent addi and add
  37. Difference between “addi” and “add” for pseudoinstruction “move” in MIPS?
  38. Printing newline in MIPS
  39. sorting array in mips (assembly)
  40. Multiplication by a power of 2 using Logical shifts in MIPS assembly
  41. the functions (procedures) in MIPS
  42. MIPS instruction and machine code
  43. How do you write code to do factorials in MIPS?
  44. Convert from Java to MIPS
  45. MIPS Recursive Fibonacci Sequence
  46. Printing from a declared array in MIPS
  47. Understanding Assembly MIPS .ALIGN and Memory Addressing
  48. MIPS to C Translation

Leave a Comment