From mboxrd@z Thu Jan 1 00:00:00 1970 From: ard.biesheuvel@linaro.org (Ard Biesheuvel) Date: Fri, 10 Oct 2014 11:25:24 +0200 Subject: [PATCH] arm64/efi: set PE/COFF section alignment to 4 KB Message-ID: <1412933124-13018-1-git-send-email-ard.biesheuvel@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Position independent AArch64 code needs to be linked and loaded at the same relative offset from a 4 KB boundary, or adrp/add and adrp/ldr pairs will not work correctly. (This is how PC relative symbol references with a 4 GB reach are emitted) We need to declare this in the PE/COFF header, otherwise the PE/COFF loader may load the Image and invoke the stub at an offset which violates this rule. Signed-off-by: Ard Biesheuvel --- arch/arm64/kernel/head.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 0a6e4f924df8..5e83e5b8a9de 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -159,7 +159,7 @@ optional_header: extra_header_fields: .quad 0 // ImageBase - .long 0x20 // SectionAlignment + .long 0x1000 // SectionAlignment .long 0x8 // FileAlignment .short 0 // MajorOperatingSystemVersion .short 0 // MinorOperatingSystemVersion @@ -226,7 +226,7 @@ section_table: .short 0 // NumberOfRelocations (0 for executables) .short 0 // NumberOfLineNumbers (0 for executables) .long 0xe0500020 // Characteristics (section flags) - .align 5 + .align 12 #endif ENTRY(stext) -- 1.8.3.2