fasm.x64 segfaults, fasm(.x32) works

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dunkaist

Joined: 31 Jul 2015
Posts: 24

dunkaist 08 Feb 2020, 23:04

Hi Tomasz,

I found that fasm.x64 crashes when fasm(.x32) reports an error.

May be this hides a bigger bug, may be not. Just letting you know.

Code:

$ fasm main.asm 
flat assembler  version 1.73.21  (16384 kilobytes memory)
main.asm [2]:
x:
processed: section '.bss':
error: illegal instruction.

$ fasm.x64 main.asm 
flat assembler  version 1.73.21  (16384 kilobytes memory, x64)
Segmentation fault (core dumped)

$ cat main.asm 
x equ section '.bss'
x:

08 Feb 2020, 23:04

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 09 Feb 2020, 09:40

Thank you! There was a forgotten PUSH+RET trick hidden there, which did not translate well to 64-bit code, because the macros I used to adapt the code to run in the long mode attempt to emulate 32-bit stack. I could try to change the macros, but instead I simply removed the trick, as it really was not necessary.

09 Feb 2020, 09:40

dunkaist

Joined: 31 Jul 2015
Posts: 24

dunkaist 11 Feb 2020, 11:23

Tomasz,

In whatsnew.txt file you wrote

Code:

version 1.73.22 (Feb 02, 2020)

Is it also a bug or you just wanted to note that palindrome day?

11 Feb 2020, 11:23

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 11 Feb 2020, 11:44

Oh, just a typo. Should not affect the performance of the assembler. Wink

11 Feb 2020, 11:44

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