"call fix" silently ignored

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rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 24 Feb 2017, 16:13

AFAIK, this bug has been around since "fix" was introduced (FASM 1.48).

Code:

org 100h
nop
call fix ; silently ignored in FASM 1.71.60
int 20h
fix:
mov al,7
int 29h
ret

Quote:

[ FreeDOS ] G:\TONY>fasm140 callfix.asm callfix.com
flat assembler version 1.40
2 passes, 11 bytes.

[ FreeDOS ] G:\TONY>ndisasm -b16 -o100h callfix.com
00000100 90 nop
00000101 E80200 call word 0x106
00000104 CD20 int 0x20
00000106 B007 mov al,0x7
00000108 CD29 int 0x29
0000010A C3 ret

[ FreeDOS ] G:\TONY>fasm150 callfix.asm callfix.com
flat assembler version 1.50
1 passes, 8 bytes.

[ FreeDOS ] G:\TONY>ndisasm -b16 -o100h callfix.com
00000100 90 nop
00000101 CD20 int 0x20
00000103 B007 mov al,0x7
00000105 CD29 int 0x29
00000107 C3 ret

24 Feb 2017, 16:13

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system

revolution 24 Feb 2017, 16:24

fix is not too dissimilar from equ.

Would you also consider call equ a bug?

24 Feb 2017, 16:24

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 24 Feb 2017, 16:27

rugxulo
call fix is not silently ignored. It's correctly preprocessed away, which is the expected behaviour. Every subsequent appearance of the "call" token would then be preprocessed away as well, because this is how fix is supposed to work. The same effect would appear with call equ .

_________________
Faith is a superposition of knowledge and fallacy

24 Feb 2017, 16:27

l4m2

Joined: 15 Jan 2015
Posts: 674

l4m2 23 Jun 2017, 10:19

Why fix: doesn't make error

23 Jun 2017, 10:19

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