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libft-asm's Introduction

Libftasm

Building

make (#ez)

Memos

available registers for our architecture:

64 bits register 32 bits access 16 bits access 8 bits access volatile function calls (integer)
rax eax ax ah / al ✅
rbx ebx bx bh / bl ❌
rcx ecx cx ch / cl ✅ 4th argument
rdx edx dx dh / dl ✅ 3rd argument
rsp esp sp spl ✅
rbp ebp bp bpl ❌
rsi esi si sil ✅ 2nd argument
rdi edi di dil ✅ 1st argument
r8 r8d r8w r8b ✅ 5th argument
r9 r9d r9w r9b ✅ 6th argument
r10 r10d r10w r10b ✅
r11 r11d r11w r11b ✅
r12 r12d r12w r12b ❌
r13 r13d r13w r13b ❌
r14 r14d r14w r14b ❌
r15 r15d r15w r15b ❌

⚠️ When using a non volatile register, be sure to save its previous value (push it on the stack) before changing it and be sure to restore it after a ret

⚠️ Do not count on volatile registers to keep their values after a call or a syscall

Contributing

  • Use 4 spaces to indent (for both asm and c++ code)
  • Use ".s" as a file extension for nasm files
  • Put nasm files in the srcs folder
  • Put c++ test files in the tests folder
  • Respect the calling conventions mentionned above
  • Write thorough tests

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