As you know, EDK2 depends on the linker stripping dead code to manage code size, especially from libraries. This is particularly important when running from a pre-DDR environment (memory-mapped flash or SRAM).
The ARM RVCT linker can only do dead code stripping by placing different functions into different section. With ARM RVCT C compiler we currently handle this with the "--split_sections" switch which forces every function into its own section. With the ARM RVCT assembler no such smart option is available. Currently the ARM support libraries (ArmLib and the like) combine all the code in an assembly file into one section. So when a module calls one function in the file, the linker includes all of the functions as well even though they're not called. The solution to this is to place an AREA directive before each function in RVCT assembly files to force them into their own sections and get the dead code stripping we want. I implemented this on our older edk2 codebase (based on rev 13353) and have attached the patch. My apologies for the patch being based on so old a revision - this means there are probably more functions that will need this treatment in the latest revision. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eugene Cohen eug...@hp.com<mailto:eug...@hp.com> Eugene
armlib_functions_in_sections.patch
Description: armlib_functions_in_sections.patch
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