From 669a7562cb3488f36550dc43b8db8d312da1f281 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Wed, 10 Aug 2016 10:55:30 +0200 Subject: [PATCH] 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 Reviewed-by: Liming Gao --- BaseTools/Scripts/GccBase.lds | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/BaseTools/Scripts/GccBase.lds b/BaseTools/Scripts/GccBase.lds index 281af8a9bd..9008487471 100644 --- a/BaseTools/Scripts/GccBase.lds +++ b/BaseTools/Scripts/GccBase.lds @@ -54,7 +54,7 @@ SECTIONS { KEEP (*(.eh_frame)) } - .rela ALIGN(CONSTANT(COMMONPAGESIZE)) : { + .rela (INFO) : { *(.rela .rela.*) } -- 2.39.2