2015-09-24 06:17:54 +03:00
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/*
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2017-08-18 22:49:43 +03:00
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* Copyright (C) 2013-2017 Linaro Ltd
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2015-09-24 06:17:54 +03:00
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* Authors: Roy Franz <roy.franz@linaro.org>
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* Ard Biesheuvel <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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2017-08-18 22:49:43 +03:00
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#include <linux/pe.h>
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#include <linux/sizes.h>
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2015-09-24 06:17:54 +03:00
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.macro __nop
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#ifdef CONFIG_EFI_STUB
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@ This is almost but not quite a NOP, since it does clobber the
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@ condition flags. But it is the best we can do for EFI, since
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@ PE/COFF expects the magic string "MZ" at offset 0, while the
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@ ARM/Linux boot protocol expects an executable instruction
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@ there.
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2017-08-18 22:49:43 +03:00
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.inst MZ_MAGIC | (0x1310 << 16) @ tstne r0, #0x4d000
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#else
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ARM: 8680/1: boot/compressed: fix inappropriate Thumb2 mnemonic for __nop
Commit 06a4b6d009a1 ("ARM: 8677/1: boot/compressed: fix decompressor
header layout for v7-M") fixed an issue in the layout of the header
of the compressed kernel image that was caused by the assembler
emitting narrow opcodes for 'mov r0, r0', and for this reason, the
mnemonic was updated to use the W() macro, which will append the .w
suffix (which forces a wide encoding) if required, i.e., when building
the kernel in Thumb2 mode.
However, this failed to take into account that on Thumb2 kernels built
for CPUs that are also ARM capable, the entry point is entered in ARM
mode, and so the instructions emitted here will be ARM instructions
that only exist in a wide encoding to begin with, which is why the
assembler rejects the .w suffix here and aborts the build with the
following message:
head.S: Assembler messages:
head.S:132: Error: width suffixes are invalid in ARM mode -- `mov.w r0,r0'
So replace the W(mov) with separate ARM and Thumb2 instructions, where
the latter will only be used for THUMB2_ONLY builds.
Fixes: 06a4b6d009a1 ("ARM: 8677/1: boot/compressed: fix decompressor ...")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
2017-06-09 12:14:53 +03:00
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AR_CLASS( mov r0, r0 )
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M_CLASS( nop.w )
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2015-09-24 06:17:54 +03:00
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#endif
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.endm
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.macro __EFI_HEADER
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#ifdef CONFIG_EFI_STUB
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.set start_offset, __efi_start - start
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.org start + 0x3c
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@
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@ The PE header can be anywhere in the file, but for
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@ simplicity we keep it together with the MSDOS header
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@ The offset to the PE/COFF header needs to be at offset
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@ 0x3C in the MSDOS header.
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@ The only 2 fields of the MSDOS header that are used are this
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@ PE/COFF offset, and the "MZ" bytes at offset 0x0.
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@
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.long pe_header - start @ Offset to the PE header.
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pe_header:
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.long PE_MAGIC
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coff_header:
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2017-08-18 22:49:43 +03:00
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.short IMAGE_FILE_MACHINE_THUMB @ Machine
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.short section_count @ NumberOfSections
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.long 0 @ TimeDateStamp
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.long 0 @ PointerToSymbolTable
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.long 0 @ NumberOfSymbols
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.short section_table - optional_header @ SizeOfOptionalHeader
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.short IMAGE_FILE_32BIT_MACHINE | \
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IMAGE_FILE_DEBUG_STRIPPED | \
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IMAGE_FILE_EXECUTABLE_IMAGE | \
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IMAGE_FILE_LINE_NUMS_STRIPPED @ Characteristics
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2015-09-24 06:17:54 +03:00
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#define __pecoff_code_size (__pecoff_data_start - __efi_start)
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optional_header:
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.short PE_OPT_MAGIC_PE32 @ PE32 format
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.byte 0x02 @ MajorLinkerVersion
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.byte 0x14 @ MinorLinkerVersion
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.long __pecoff_code_size @ SizeOfCode
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.long __pecoff_data_size @ SizeOfInitializedData
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.long 0 @ SizeOfUninitializedData
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.long efi_stub_entry - start @ AddressOfEntryPoint
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.long start_offset @ BaseOfCode
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.long __pecoff_data_start - start @ BaseOfData
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extra_header_fields:
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.long 0 @ ImageBase
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.long SZ_4K @ SectionAlignment
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.long SZ_512 @ FileAlignment
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.short 0 @ MajorOsVersion
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.short 0 @ MinorOsVersion
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.short 0 @ MajorImageVersion
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.short 0 @ MinorImageVersion
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.short 0 @ MajorSubsystemVersion
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.short 0 @ MinorSubsystemVersion
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.long 0 @ Win32VersionValue
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.long __pecoff_end - start @ SizeOfImage
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.long start_offset @ SizeOfHeaders
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.long 0 @ CheckSum
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.short IMAGE_SUBSYSTEM_EFI_APPLICATION @ Subsystem
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.short 0 @ DllCharacteristics
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.long 0 @ SizeOfStackReserve
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.long 0 @ SizeOfStackCommit
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.long 0 @ SizeOfHeapReserve
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.long 0 @ SizeOfHeapCommit
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.long 0 @ LoaderFlags
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.long (section_table - .) / 8 @ NumberOfRvaAndSizes
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2017-08-18 22:49:43 +03:00
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.quad 0 @ ExportTable
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.quad 0 @ ImportTable
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.quad 0 @ ResourceTable
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.quad 0 @ ExceptionTable
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.quad 0 @ CertificationTable
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.quad 0 @ BaseRelocationTable
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section_table:
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.ascii ".text\0\0\0"
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.long __pecoff_code_size @ VirtualSize
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.long __efi_start @ VirtualAddress
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.long __pecoff_code_size @ SizeOfRawData
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2017-08-18 22:49:43 +03:00
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.long __efi_start @ PointerToRawData
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.long 0 @ PointerToRelocations
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.long 0 @ PointerToLineNumbers
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.short 0 @ NumberOfRelocations
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.short 0 @ NumberOfLineNumbers
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.long IMAGE_SCN_CNT_CODE | \
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IMAGE_SCN_MEM_READ | \
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IMAGE_SCN_MEM_EXECUTE @ Characteristics
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2017-08-18 22:49:44 +03:00
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.ascii ".data\0\0\0"
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.long __pecoff_data_size @ VirtualSize
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.long __pecoff_data_start - start @ VirtualAddress
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.long __pecoff_data_rawsize @ SizeOfRawData
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.long __pecoff_data_start - start @ PointerToRawData
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.long 0 @ PointerToRelocations
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.long 0 @ PointerToLineNumbers
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.short 0 @ NumberOfRelocations
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.short 0 @ NumberOfLineNumbers
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.long IMAGE_SCN_CNT_INITIALIZED_DATA | \
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IMAGE_SCN_MEM_READ | \
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IMAGE_SCN_MEM_WRITE @ Characteristics
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2017-08-18 22:49:43 +03:00
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.set section_count, (. - section_table) / 40
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2017-08-18 22:49:44 +03:00
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.align 12
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__efi_start:
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#endif
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.endm
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