From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 02/10] arm64/efi: efistub: cover entire static mem footprint in PE/COFF .text
Date: Mon, 21 Jul 2014 17:16:17 +0200 [thread overview]
Message-ID: <1405955785-13477-3-git-send-email-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <1405955785-13477-1-git-send-email-ard.biesheuvel@linaro.org>
The static memory footprint of a kernel Image at boot is larger than the
Image file itself. Things like .bss data and initial page tables are allocated
statically but populated dynamically so their content is not contained in the
Image file.
However, if EFI has loaded the Image at precisely the desired offset of
base of DRAM + TEXT_OFFSET, the Image will be booted in place, and we have
to make sure that the allocation done by the EFI loader is large enough.
Fix this by growing the PE/COFF .text section to cover the entire static
memory footprint. The part of the section that is not covered by the payload
will be zero initialised by the EFI loader.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
arch/arm64/kernel/head.S | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 5cd1f3491df5..c63f44f20ae3 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -150,7 +150,7 @@ optional_header:
.short 0x20b // PE32+ format
.byte 0x02 // MajorLinkerVersion
.byte 0x14 // MinorLinkerVersion
- .long _edata - stext // SizeOfCode
+ .long _end - stext // SizeOfCode
.long 0 // SizeOfInitializedData
.long 0 // SizeOfUninitializedData
.long efi_stub_entry - efi_head // AddressOfEntryPoint
@@ -168,7 +168,7 @@ extra_header_fields:
.short 0 // MinorSubsystemVersion
.long 0 // Win32VersionValue
- .long _edata - efi_head // SizeOfImage
+ .long _end - efi_head // SizeOfImage
// Everything before the kernel image is considered part of the header
.long stext_offset // SizeOfHeaders
@@ -215,7 +215,7 @@ section_table:
.byte 0
.byte 0
.byte 0 // end of 0 padding of section name
- .long _edata - stext // VirtualSize
+ .long _end - stext // VirtualSize
.long stext_offset // VirtualAddress
.long _edata - stext // SizeOfRawData
.long stext_offset // PointerToRawData
--
1.8.3.2
next prev parent reply other threads:[~2014-07-21 15:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-21 15:16 [RFC PATCH 00/10] arm64: boot BE kernels from UEFI Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 01/10] arm64/efi: efistub: jump to 'stext' directly, not through the header Ard Biesheuvel
2014-07-21 15:16 ` Ard Biesheuvel [this message]
2014-07-21 15:16 ` [RFC PATCH 03/10] arm64: add macros to emit little endian ASM constants Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 04/10] arm64: add EFI little endian constants to linker script Ard Biesheuvel
2014-07-30 14:18 ` Matt Fleming
2014-07-30 14:21 ` Ard Biesheuvel
2014-07-30 14:22 ` Will Deacon
2014-07-21 15:16 ` [RFC PATCH 05/10] arm64/efi: update the PE/COFF header to be endian agnostic Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 06/10] arm64/efi: efistub: avoid using linker defined constants Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 07/10] arm64/efi: efistub: add support for booting a BE kernel Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 08/10] arm64/efi: use LE accessors to access UEFI data Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 09/10] arm64/efi: enable minimal UEFI Runtime Services for big endian Ard Biesheuvel
2014-07-23 9:34 ` Mark Rutland
2014-07-23 10:59 ` Ard Biesheuvel
2014-07-23 17:52 ` Ard Biesheuvel
2014-07-21 15:16 ` [RFC PATCH 10/10] arm64: Kconfig: enable UEFI on BE kernels Ard Biesheuvel
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