VLINK multiple VASM objects

roondar · 23 April 2016, 16:54

I have a bit of a conundrum on my hands.

I have been linking several object files output by VASM together using VLINK. This works fine.

However, changing the order of the files in the linker arguments also changes the application entry point - whichever file is first always gets called into. Now, I've tried using the -e flag to get VLINK to use a different entry point, but to no succes.

I can't figure out how to define the entry point in my assembly files. I've tried -e and using an _start label in my code as well as -e <label> with a that label in my code. Neither works.

My feeling is I'm overlooking something very simple. But I can't figure it out. So: how should I do this to get it to work?

phx · 23 April 2016, 21:24

Not all vlink options are valid for all output file formats. Setting the entry point with -e works for ELF executables, but not for Amiga hunk-format executables. They always start at the first byte of the first section.

That's not a limitation of vlink, but of AmigaDOS hunk-format.

roondar · 24 April 2016, 01:03

Ah, that explains that.
Thanks for the answer, I'll just link the startup code as first file then!

23 April 2016, 16:54	#1
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,406	VLINK multiple VASM objects I have a bit of a conundrum on my hands. I have been linking several object files output by VASM together using VLINK. This works fine. However, changing the order of the files in the linker arguments also changes the application entry point - whichever file is first always gets called into. Now, I've tried using the -e flag to get VLINK to use a different entry point, but to no succes. I can't figure out how to define the entry point in my assembly files. I've tried -e and using an _start label in my code as well as -e <label> with a that label in my code. Neither works. My feeling is I'm overlooking something very simple. But I can't figure it out. So: how should I do this to get it to work?

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23 April 2016, 21:24	#2
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,496	Not all vlink options are valid for all output file formats. Setting the entry point with -e works for ELF executables, but not for Amiga hunk-format executables. They always start at the first byte of the first section. That's not a limitation of vlink, but of AmigaDOS hunk-format.

24 April 2016, 01:03	#3
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,406	Ah, that explains that. Thanks for the answer, I'll just link the startup code as first file then!

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