56 lines
1.2 KiB
NASM
56 lines
1.2 KiB
NASM
default rel ; make [rel format] the default, you always want this. idk why i always want this but im taking it anyway
|
|
extern puts
|
|
extern printf
|
|
|
|
|
|
|
|
section .data
|
|
text db "Bottom Text",0
|
|
val dq 123.45
|
|
|
|
section .bss
|
|
res resq 1 ; reserve 1 quadword for result
|
|
|
|
section .rodata
|
|
format db "%#f", 10, 0 ; C 0-terminated string: "%#x\n" idk why this is in its own section im just stealing code
|
|
|
|
section .text
|
|
global main
|
|
|
|
main:
|
|
sub rsp, 8 ;this is needed because im using "C"
|
|
|
|
|
|
; load value into st(0)
|
|
fld qword [val] ; treat val as an address to a qword <it has to know that its a qword i think idk this shit is scary>
|
|
|
|
; compute square root of st(0) and store the result in st(0)
|
|
fsqrt ;<so like the fpu has like its own registers that cant be used with mov and they act as a stack or somthing and its fucking scary help me>
|
|
|
|
; store st(0) at res, and pop it off the x87 stack
|
|
fstp qword [res]
|
|
|
|
; the FPU stack is now empty again
|
|
|
|
|
|
|
|
|
|
mov rdi, res
|
|
cld
|
|
call puts ;this is the puts way of printing a string
|
|
|
|
mov esi, res
|
|
lea rdi, [rel format]
|
|
cld
|
|
call printf
|
|
|
|
|
|
_end:
|
|
add rsp, 8
|
|
ret
|
|
|
|
; mov rax, 60 ; exit
|
|
; mov edi, 1 ; error 1 dont need the exit anymore beacue libc or somthing
|
|
; syscall
|
|
|
|
|