x86_64 registers rax/eax/ax/al overwriting full register contents [duplicate]

by

More Related Contents:

  1. Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
  2. What do the E and R prefixes stand for in the names of Intel 32-bit and 64-bit registers?
  3. Why are rbp and rsp called general purpose registers?
  4. Why is the address of static variables relative to the Instruction Pointer?
  5. What are the names of the new X86_64 processors registers?
  6. Assembly registers in 64-bit architecture
  7. Why can I access lower dword/word/byte in a register but not higher?
  8. What’s the best way to remember the x86-64 System V arg register order?
  9. Why use RIP-relative addressing in NASM?
  10. Why doesn’t GCC use partial registers?
  11. How do AX, AH, AL map onto EAX?
  12. Difference between movq and movabsq in x86-64
  13. Where exactly is the red zone on x86-64?
  14. Why is there not a register that contains the higher bytes of EAX?
  15. why we can’t move a 64-bit immediate value to memory?
  16. Set all bits in CPU register to 1 efficiently
  17. Why NASM on Linux changes registers in x86_64 assembly
  18. Why is imul used for multiplying unsigned numbers?
  19. Does it make any sense to use the LFENCE instruction on x86/x86_64 processors?
  20. Why not store function parameters in XMM vector registers?
  21. Segmentation fault when using DB (define byte) inside a function
  22. How to use RIP Relative Addressing in a 64-bit assembly program?
  23. What does an asterisk * before an address mean in x86-64 AT&T assembly?
  24. When should I use size directives in x86?
  25. Why are x86 registers named the way they are?
  26. Understanding %rip register in intel assembly
  27. Using 8-bit registers in x86-64 indexed addressing modes
  28. What is callq instruction?
  29. Handling calls to (potentially) far away ahead-of-time compiled functions from JITed code
  30. Assembly x86 registers signed or unsigned

Leave a Comment