"Roger Miller" <Roger_M1@xxxxxxxxxxxx> writes:
> I seem to have run into a chicken-and-egg problem in ld. Basically
> I need to build an executable file for an ARM embedded system with
> the following layout:
>
> .text at a fixed address
> read-only copy of .data (copied to RAM at startup)
> padding to page boundary (1024-byte page size)
> .data (RAM)
> .bss (RAM)
>
> The problem is that the address of the .data section depends on its
> size, because of the read-only copy of it which follows .text. But
> determining the size requires linking it, and ld won't do this without
> a constant address.
>
> My inelegant work-around is to do a preliminary link with .data at a
> dummy address, use objdump to get the section size, calculate the actual
> .data address, and link again. Is something like this the only way to
> handle the problem, or am I overlooking some linker script feature that
> could handle this in a single pass?
This is not really the right mailing list for linker questions.
Better mailing lists would be bug-binutils@xxxxxxx or
binutils@xxxxxxxxxxxxxxx
In a linker script you can use SIZEOF to get the size of a section.
You can use that as a section address.
For an example of the type of thing you are trying to do, see:
http://sources.redhat.com/binutils/docs-2.12/ld.info/Output-Section-LMA.html#Output%20Section%20LMA
Ian
