Ok, I created a script after all - I went ahead and created a script to add AREA directives whenever an exported label is found.
Same question as before: do you want me to submit a patchset with the AREA prefixes added or do you (Ard/Leif) want to handle this? Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eugene Cohen eug...@hp.com<mailto:eug...@hp.com> -----Original Message----- From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of Cohen, Eugene Sent: Thursday, November 19, 2015 5:53 AM To: edk2-devel@lists.01.org Subject: [edk2] ArmPkg: Dead code stripping [I thought I upstreamed this long ago but it must have been a dream, so here goes...] Leif and Ard, In order to get the RVCT toolchain to dead code stripping at link time (the --remove option, which is the default), each function needs to be in its own section. For C code we accomplish this --split_sections switch. For assembly there is no switch I'm aware of so the source code must define each function in its own section with AREA prefixes, like this: AREA s_ArmInvalidateDataCacheEntryByMVA, CODE, READONLY ArmInvalidateDataCacheEntryByMVA mcr p15, 0, r0, c7, c6, 1 ; invalidate single data cache line dsb isb bx lr AREA s_ ArmCleanDataCacheEntryByMVA, CODE, READONLY ArmCleanDataCacheEntryByMVA mcr p15, 0, r0, c7, c10, 1 ; clean single data cache line dsb isb bx lr for larger assembly files the code size saving can be substantial, especially for uncompressed/XIP code. So I think we need to process *.asm in ArmPkg to add the AREA directives to get proper section splitting. (I know this applies to RVCT for the ARM architecture - I'm not sure if there is an AArch64 equivalent.) Shall I start submitting patches to add the AREA prefixes or would you like to investigate some alternatives? Since our needs have only been for a few files I just manually added the prefixes. Perhaps a clever script could automatically generate the prefixes in one sweep and we can hit all the files at once. Thanks, Eugene _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
