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The CLANG38 toolchain creates a PIE binary at link time. This is
necessary since the LTO code generation may otherwise result in
code that cannot execute correctly when loaded above 2 GB.
PIE executables contain a RELA section consisting of dynamic
relocation entries that are intended for consumption by the loader
at runtime. For this reason, it has the SHF_ALLOC attribute set by
default, and will be identified by GenFw as a section that needs to
be copied into the PE/COFF binary, resulting in waste of space since
the PE/COFF loader does not use this data at all.
So mark the RELA section as informational: this will prevent the
linker from setting the SHF_ALLOC attribute, causing GenFw to
ignore it.
DxeCore.efi before:
Detected 'X64' type PE/COFF image consisting of 3 sections
Section alignment: 0x40
File alignment: 0x40
Section '.text' @ 0x00000240
File offset: 0x240
Virtual size: 0x21000
Raw size: 0x21000
Section '.data' @ 0x00021240
File offset: 0x21240
Virtual size: 0x3640
Raw size: 0x3640
Section '.reloc' @ 0x00024880
File offset: 0x24880
Virtual size: 0x280
Raw size: 0x280
DxeCore.efi after:
Detected 'X64' type PE/COFF image consisting of 3 sections
Section alignment: 0x40
File alignment: 0x40
Section '.text' @ 0x00000240
File offset: 0x240
Virtual size: 0x1f440
Raw size: 0x1f440
Section '.data' @ 0x0001f680
File offset: 0x1f680
Virtual size: 0x3640
Raw size: 0x3640
Section '.reloc' @ 0x00022cc0
File offset: 0x22cc0
Virtual size: 0x280
Raw size: 0x280
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
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|---|---|---|
| .. | ||
| ConvertMasmToNasm.py | ||
| ConvertUni.py | ||
| GccBase.lds | ||
| MemoryProfileSymbolGen.py | ||
| PatchCheck.py | ||
| Rvct-Align4K.sct | ||
| Rvct-Align32.sct | ||
| SetVisualStudio.bat | ||
| ShowEnvironment.bat | ||
| UpdateBuildVersions.py | ||