fas -> dwarf2?

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litwr

Joined: 23 Aug 2005
Posts: 11
Location: Moscow, Russia

litwr 07 Nov 2014, 19:19

I begin to think about a converter from FAS to DWARF2 format. Could anybody help to estimate the difficulty of this task? I like FASM and GDB but can't use them together. Sad

07 Nov 2014, 19:19

redsock

Joined: 09 Oct 2009
Posts: 430
Location: Australia

redsock 08 Nov 2014, 06:31

I use fasm + gdb constantly, and have found that so long as I use public symbols and framepointers, it is a breeze (and works as you'd expect/want).

Code:

        format ELF64

public crashycrashy
crashycrashy:
        push    rbp
        mov     rbp, rsp        ; framepointers to make gdb happy

        xor     eax, eax
        mov     dword [rax], 0
        
        leave                   ; restore stackframe
        ret

public _start
_start:
        push    rbp
        mov     rbp, rsp        ; framepointers to make gdb happy

        call    crashycrashy

        mov     eax, 60         ; exit
        xor     edi, edi        ; return code
        syscall

compile/link with:
fasm example.asm && ld -o example example.o

seems better than going to DWARF2 imo Smile

Cheers

08 Nov 2014, 06:31

litwr

Joined: 23 Aug 2005
Posts: 11
Location: Moscow, Russia

litwr 08 Nov 2014, 10:11

Thank you. However this way can't satisfy me. I want to use b, l, d, ... - commands which are only available if the symbolic information is provided... I use gdb to work with C/C++ and want to use the same ways with Assembler.

08 Nov 2014, 10:11

Endre

Joined: 29 Dec 2003
Posts: 215
Location: Budapest, Hungary

Endre 08 Nov 2014, 16:01

Dwarf format is rather complex. You might want to take a look at stabs format which is simpler and gdb knows it. The other option is using another assembler as e.g. (g)as, yasm, nasm, etc. On Linux I use exclusively (g)as which is always available and knows everything I need. (g)as has the advantage that you can easily use the C preprocessor. There are some examples here and here. And you can use the mentioned gdb commands.

08 Nov 2014, 16:01

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