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 <ard.biesheu...@linaro.org>
---
BaseTools/Scripts/GccBase.lds | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/BaseTools/Scripts/GccBase.lds b/BaseTools/Scripts/GccBase.lds
index 3d99f01db21f..4ee6d998532c 100644
--- a/BaseTools/Scripts/GccBase.lds
+++ b/BaseTools/Scripts/GccBase.lds
@@ -29,6 +29,13 @@ SECTIONS {
*(.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.*)
}
/*
--
1.9.1
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.01.org
https://lists.01.org/mailman/listinfo/edk2-devel
