Revision: 18137
http://sourceforge.net/p/edk2/code/18137
Author: abiesheuvel
Date: 2015-08-03 08:22:50 +0000 (Mon, 03 Aug 2015)
Log Message:
-----------
BaseTools GCC: move AutoGen.obj contents to .text section
All AutoGen.obj files consist of global GUID definitions, fixed
and patchable PCDs and other data that is essentially read-only at
runtime but has not been declared as such for various reasons.
By moving these contents to .text we achieve two things:
- global GUIDs and other data items which must be constant for correct
program operation can no longer be modified, for instance, when
running a DXE_RUNTIME_MODULE binary under the OS with the Properties
Table feature for memory protection enabled;
- the .data section becomes smaller, and may be dropped completely for
many XIP modules, which reduces wasted FV space if the PE/COFF section
alignment is large.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Tested-by: Liming Gao <[email protected]>
Tested-by: Leif Lindholm <[email protected]>
Modified Paths:
--------------
trunk/edk2/BaseTools/Scripts/GccBase.lds
Modified: trunk/edk2/BaseTools/Scripts/GccBase.lds
===================================================================
--- trunk/edk2/BaseTools/Scripts/GccBase.lds 2015-08-03 08:22:39 UTC (rev
18136)
+++ trunk/edk2/BaseTools/Scripts/GccBase.lds 2015-08-03 08:22:50 UTC (rev
18137)
@@ -29,6 +29,13 @@
*(.text .text.* .stub .gnu.linkonce.t.*)
*(.rodata .rodata.* .gnu.linkonce.r.*)
*(.got .got.*)
+
+ /*
+ * The contents of AutoGen.c files are constant from the POV of the
program,
+ * but most of its contents end up in .data or .bss by default since few of
+ * the variable definitions that get emitted are declared as CONST.
+ */
+ *:AutoGen.obj(.data .data.* .bss .bss.*)
}
/*
------------------------------------------------------------------------------
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