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