ft_read.s

;ssize_t ft_read(int fildes, void *buf, size_t nbyte);
;rdi == fildes, rsi == buf, rdx == nbyte 

global _ft_read
extern ___error

section .text

_ft_read:
xor		rax, rax
mov		rax, 0x2000003
syscall
jc		err
ret

err:
push	rax
call	___error
pop		r11
mov		[rax], r11
mov		rax, -1
ret