CODEWITHSUNDEEP
assemblyarm
Shums Badwal
Shums Badwal

Reputation: 145

Linking 2 object files?

I started out with ARM assembly language recently and have assembled two source files model.s and v_bin.s to model.o and v_bin.o respectively; v_bin.s contains a subroutine, and model.s contains the calling code. I wish to link the two object files to an executable. Any ideas?

Upvotes: 2

Views: 899

Answers (2)

Peter Cordes
Peter Cordes

Reputation: 364593

You need to use .globl my_func to export the symbol my_func (defined by a label like my_func:) so other files can call your my_func. (GAS manual).

So ld can match up a reference to my_func in one .o with a definition in another .o.

Then you can link normally by passing multiple .o files to whatever you normally use to link one into a binary. (e.g. gcc or ld)

Without .globl on a symbol name you define, it's private to this object file, like C static functions and file-scope variables.

Upvotes: 1

Rajnesh
Rajnesh

Reputation: 923

Simply if you want to link these two files you can run the following to get this done. Assuming you are using arm-none-eabi toolchain and no library dependency.

arm-none-eabi-ld -T your-linker-script.ld -o "app.elf" v_bin.o model.o

A good resource is http://www.martinhubacek.cz/arm/arm-cortex-bare-metal-assembly/stm32f0-cortex-m0-bare-metal-assembly Look at the make file the guy has created

Upvotes: 0

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