On 6/8/20 7:34 PM, Ard Biesheuvel wrote:
To help converted ELF images perform self-relocation, export a symbol
'ElfImageBase' that can be used in the code to discover the start of
the image in memory.
Note the use of PROVIDE() - this ensures that the symbol is only emitted
if a reference to it exists in the code being linked, but no definition.
This means the symbol is never emitted in a way that can conflict with
existing code.
Signed-off-by: Ard Biesheuvel <[email protected]>
Bob, Liming, any objections?
---
BaseTools/Scripts/GccBase.lds | 2 ++
1 file changed, 2 insertions(+)
diff --git a/BaseTools/Scripts/GccBase.lds b/BaseTools/Scripts/GccBase.lds
index a9dd2138d4b5..e73c1206a2e2 100644
--- a/BaseTools/Scripts/GccBase.lds
+++ b/BaseTools/Scripts/GccBase.lds
@@ -12,6 +12,8 @@
SECTIONS {
+ PROVIDE(ElfImageBase = .);
+
/*
* The PE/COFF binary consists of DOS and PE/COFF headers, and a sequence of
* section headers adding up to PECOFF_HEADER_SIZE bytes (which differs
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