Reviewed-by: Bob Feng<[email protected]> -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Ard Biesheuvel Sent: Tuesday, June 9, 2020 1:34 AM To: [email protected] Cc: Ard Biesheuvel <[email protected]>; Feng, Bob C <[email protected]>; Gao, Liming <[email protected]>; Laszlo Ersek <[email protected]>; Leif Lindholm <[email protected]>; Ilias Apalodimas <[email protected]>; Julien Grall <[email protected]>; Yao, Jiewen <[email protected]> Subject: [edk2-devel] [PATCH 2/4] BaseTools/Scripts/GccBase.lds: export image base symbol
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]> --- 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-- 2.26.2 -=-=-=-=-=-= Groups.io Links: You receive all messages sent to this group. View/Reply Online (#60893): https://edk2.groups.io/g/devel/message/60893 Mute This Topic: https://groups.io/mt/74757210/1768742 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-= -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#61200): https://edk2.groups.io/g/devel/message/61200 Mute This Topic: https://groups.io/mt/74757210/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
