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flat assembler > High Level Languages > fasmg GCC x86 backend

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Mike Gonta



Joined: 26 Dec 2010
Posts: 193
fasmg GCC x86 backend
Specifically, this is for 32 bit, .intel_syntax noprefix, GCC "C" asm output obtained with -masm=intel -S options.
The -S option produces the asm file (usually passed on to as).
Assemble with:

Code:
fasmg -i "include('80386.inc')" -i "include('gas.inc')" -i "include('align.inc')" -i "use32" -i "org 0x7C00"  x.asm x.bin

Todo: section and ???
Added align to gas.inc and included align.inc and org on command line for linking flat binary.

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Mike Gonta
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Last edited by Mike Gonta on 27 May 2017, 22:49; edited 5 times in total
Post 22 Apr 2017, 18:58
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Tomasz Grysztar
Assembly Artist


Joined: 16 Jun 2003
Posts: 6514
Location: Kraków, Poland
Very interesting idea!

Does GCC produce register-based addresses with a strictly predictable structure? If it is always like displacement[base+index*scale] (plus simpler variants) then you could in theory replace the algebraic address parser that standard fasmg's macros use with a dedicated one. And parsing the AT&T syntax, as horrible as it is for anyone used to Intel one, could be probably even simpler.
Post 22 Apr 2017, 19:36
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Mike Gonta



Joined: 26 Dec 2010
Posts: 193

Tomasz Grysztar wrote:
Very interesting idea!

I was thinking more along the lines of having only one "C" compiler and letting fasmg generate multiple formats
instead of a native compiler and many cross compilers.

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Mike Gonta
look and see - many look but few see

http://mikegonta.com
Post 22 Apr 2017, 20:14
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich

Tomasz Grysztar wrote:
parsing the AT&T syntax, as horrible as it is for anyone used to Intel one,


I think there are not much people who like the AT&T syntax at all. Razz
Post 22 Apr 2017, 22:18
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