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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-08-10 10:55:30 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-08-22 12:26:42 +0200 |
| commit | 669a7562cb3488f36550dc43b8db8d312da1f281 (patch) | |
| tree | 733e604fa570c8109c967535211d8ac4f4e83642 /MdePkg/Library/BaseMemoryLibOptDxe/MemLibGuid.c | |
| parent | 5217ea2ac20a5e957cfbb7925dccd432f6241ea2 (diff) | |
| download | edk2-platforms-669a7562cb3488f36550dc43b8db8d312da1f281.tar.xz | |
BaseTools/GccBase.lds: don't copy RELA section to PE/COFF
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>
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibOptDxe/MemLibGuid.c')
0 files changed, 0 insertions, 0 deletions