How to keep the name of the labels at the compilation?

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Mino

Joined: 14 Jan 2018
Posts: 163

Mino 27 May 2020, 13:54

Hello

I would like to profile the executables generated by fasm, and it would be nice to see what part of the code (so function / label) am I looking at, as you can see on the picture there are `unknown`s. So I wonder if there was a way to keep the label name information at compile time?

Here is the tested code:

Code:

format PE64 console
entry entry_

section '.text' code readable executable

fac:
    cmp     edi, 1
    jle     .L4
    mov     eax, 1

.L3:
    mov     edx, edi
    sub     edi, 1
    imul    eax, edx
    cmp     edi, 1
    jne     .L3
    ret

.L4:
    mov     eax, edi
    ret

entry_:
    mov     edi, 3
    call    fac
    ret

Thank you in advance Smile

Description:
Filesize:	71.63 KB
Viewed:	5107 Time(s)

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27 May 2020, 13:54

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20462
Location: In your JS exploiting you and your system

revolution 28 May 2020, 12:13

fasm can generate a .fas file, which contains all the assembly data.

From the .fas file you can create a debug file suitable for your debugger.

28 May 2020, 12:13

Mino

Joined: 14 Jan 2018
Posts: 163

Mino 28 May 2020, 23:36

Thank you for your answer, that seems to be what I'm looking for. I can't figure out how to generate such a file however outside of fasmw?, do I need to specify a particular format or compilation option? I tried format FAS, but it doesn't compile.

28 May 2020, 23:36

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20462
Location: In your JS exploiting you and your system

revolution 28 May 2020, 23:59

You specify the filename on the command line.

Code:

usage: fasm <source> [output]
optional settings:
 -m <limit>         set the limit in kilobytes for the available memory
 -p <limit>         set the maximum allowed number of passes
 -d <name>=<value>  define symbolic variable
 -s <file>          dump symbolic information for debugging

Use the -s option.

28 May 2020, 23:59

Mino

Joined: 14 Jan 2018
Posts: 163

Mino 29 May 2020, 09:54

Oh nice, thank you very much!

29 May 2020, 09:54

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