ld script question (arch/um/kernel/dyn.lds.S)

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Hi everyone,

I know that this is very specific question but I could not quite
understand one of ld script in  arch/um/kernel/ path.
In that directory, there is a dyn.lds.S script and inside the script I
see '__executable_start = START' line.

Normally, in the user space when we compile program, it uses the
default linker script which in my machine says '__executable_start =
0x08048000'

But for dyn.lds.S, it has a variable START to define
__executable_start so I was wondering where/how START value is defined
to interact with dyn.lds.S

Thank you very much in advance.

Ilho <><
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