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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-08-03 08:22:50 +0000
committerabiesheuvel <abiesheuvel@Edk2>2015-08-03 08:22:50 +0000
commit233bd25b000f92fc4bbe181fa48edcd72808de8e (patch)
tree16861c9c46c0fe2145a2b57d5f8a5e8909bfc452 /BaseTools/Scripts/GccBase.lds
parent56948ba190b8920f38564050e1c2742b967a4d13 (diff)
downloadedk2-platforms-233bd25b000f92fc4bbe181fa48edcd72808de8e.tar.xz
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 <ard.biesheuvel@linaro.org> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Tested-by: Liming Gao <liming.gao@intel.com> Tested-by: Leif Lindholm <leif.lindholm@linaro.org> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18137 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'BaseTools/Scripts/GccBase.lds')
-rw-r--r--BaseTools/Scripts/GccBase.lds7
1 files changed, 7 insertions, 0 deletions
diff --git a/BaseTools/Scripts/GccBase.lds b/BaseTools/Scripts/GccBase.lds
index 3d99f01db2..4ee6d99853 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.*)
}
/*