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Index > Compiler Internals > weird error, seems like bug

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ProphetOfDoom



Joined: 08 Aug 2008
Posts: 120
Location: UK
ProphetOfDoom
Using fasm 1.70.03 for Linux. First of all, this code isn't intended to do anything useful - it's just a small snippet to illustrate the problem. Look at the two commented lines.

Code:
format ELF64

section '.data' writable

public main

extrn "exit" as exit:qword
extrn "printf" as printf:qword

align 8
SC1 db "Hi.",0

section '.text' executable

main:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; assembler accepts this instruction

mov rdi, SC1
mov rax, 0
call printf

call func
call exit

func:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; this (identical) instruction causes assembly to fail, and it says that "call printf" has a "value out of range" error. Changing the - to a + stops it complaining
ret
    


This nasm equivalent assembles fine:

Code:
global main

extern printf
extern exit

section .DATA

align 8
SC1: db "Hi.",0

SECTION .TEXT

main:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; nasm accepts this instruction

mov rdi, SC1
mov rax, 0
call printf

call func
call exit

func:

push rbp
mov rbp, rsp

mov qword [rbp - 16], rdi ; nasm accepts this instruction too
ret
    
Post 09 Sep 2013, 19:32
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7797
Location: Kraków, Poland
Tomasz Grysztar
Yes, it is an ugly bug, thank you for reporting it. I have fixed it and I'm uploading the new release (1.71.13).
Post 09 Sep 2013, 20:59
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ProphetOfDoom



Joined: 08 Aug 2008
Posts: 120
Location: UK
ProphetOfDoom
You're welcome. Thanks a lot for fixing! Smile And thanks generally for an amazing piece of software.

Regards,
Me
Post 09 Sep 2013, 21:18
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