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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-11-05 17:00:56 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2014-11-11 22:23:11 +0000 |
| commit | 243b6754cd17112bbf0724ed3c13446b48cf6a28 (patch) | |
| tree | d105e79e798f37fabc49ae2996534af800c77379 /drivers/firmware | |
| parent | af5a29aee4d1e5b5fbfbaf45cb097f9c6257c7b8 (diff) | |
| download | linux-243b6754cd17112bbf0724ed3c13446b48cf6a28.tar.bz2 | |
efi/x86: Move x86 back to libstub
This reverts commit 84be880560fb, which itself reverted my original
attempt to move x86 from #include'ing .c files from across the tree
to using the EFI stub built as a static library.
The issue that affected the original approach was that splitting
the implementation into several .o files resulted in the variable
'efi_early' becoming a global with external linkage, which under
-fPIC implies that references to it must go through the GOT. However,
dealing with this additional GOT entry turned out to be troublesome
on some EFI implementations. (GCC's visibility=hidden attribute is
supposed to lift this requirement, but it turned out not to work on
the 32-bit build.)
Instead, use a pure getter function to get a reference to efi_early.
This approach results in no additional GOT entries being generated,
so there is no need for any changes in the early GOT handling.
Tested-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index aef6a95adef5..d8be608a9f3b 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -7,4 +7,4 @@ obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o obj-$(CONFIG_UEFI_CPER) += cper.o obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o -obj-$(CONFIG_EFI_ARM_STUB) += libstub/ +obj-$(CONFIG_EFI_STUB) += libstub/ |