4f8b339fac
This makes setup and teardown functions defined with
__attribute__((__constructor__) and __attribute__((__destructor__)) work
in normal circumstances in EFI binaries.
A couple of notes:
- it implements both the old-style .ctors/.dtors methods and the newer
style .init_array/.fini_array ELF constructor and destructor arrays,
processed in the order:
.init_array[]
.ctors[]
efi_main()
.dtors[]
.fini_array[]
- Destructors will only be called if efi_main() exits using "return";
any call to Exit() will still longjmp() past them.
- InitializeLib() has already been called before constructors run, so
they don't need to call it (and neither does anything else.) For
compatibility, it has been altered so calling it more than once is
safe.
- No attempt is made to handle any constructor or destructor with a
prototype other than "void func(void);", but note that InitializeLib
has been called, so LibImageHandle, ST, BS, and RT are set.
- The init_array/ctor/dtor/fini_array lists aren't the using the GNU
"CONSTRUCTOR" output section command, so they don't start with a size.
- The lists are individually sorted during the link stage via
SORT_BY_NAME() in the linker script.
- The default (empty) init_array/ctor/dtor/fini_array lists are padded
out to 8-byte alignment with ".p2align 3, 0", and each list always has
at least one ".long 0" at the end of it (even if it's completely
empty). As a result, they can have NULLs that need to be skipped.
The sections they're in are mergeable, so the NULLs don't have to be
exclusively at the end.
- The ia64 and mips64el arches have not been tested.
Signed-off-by: Peter Jones <pjones@redhat.com>
150 lines
4.2 KiB
ArmAsm
150 lines
4.2 KiB
ArmAsm
/*
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* crt0-efi-arm.S - PE/COFF header for ARM EFI applications
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*
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* Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice and this list of conditions, without modification.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or (at your option) any later version.
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*/
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.section .text.head
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/*
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* Magic "MZ" signature for PE/COFF
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*/
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.globl ImageBase
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ImageBase:
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.ascii "MZ"
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.skip 58 // 'MZ' + pad + offset == 64
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.long pe_header - ImageBase // Offset to the PE header.
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pe_header:
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.ascii "PE"
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.short 0
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coff_header:
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.short 0x1c2 // Mixed ARM/Thumb
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.short 2 // nr_sections
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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 0x306 // Characteristics.
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// 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
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optional_header:
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.short 0x10b // PE32+ format
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.byte 0x02 // MajorLinkerVersion
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.byte 0x14 // MinorLinkerVersion
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.long _edata - _start // SizeOfCode
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.long 0 // SizeOfInitializedData
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.long 0 // SizeOfUninitializedData
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.long _start - ImageBase // AddressOfEntryPoint
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.long _start - ImageBase // BaseOfCode
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.long 0 // BaseOfData
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extra_header_fields:
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.long 0 // ImageBase
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.long 0x20 // SectionAlignment
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.long 0x8 // FileAlignment
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.short 0 // MajorOperatingSystemVersion
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.short 0 // MinorOperatingSystemVersion
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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 _edata - ImageBase // SizeOfImage
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// Everything before the kernel image is considered part of the header
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.long _start - ImageBase // SizeOfHeaders
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.long 0 // CheckSum
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.short EFI_SUBSYSTEM // 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 0x6 // NumberOfRvaAndSizes
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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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section_table:
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/*
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* The EFI application loader requires a relocation section
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* because EFI applications must be relocatable. This is a
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* dummy section as far as we are concerned.
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*/
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.ascii ".reloc"
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.byte 0
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.byte 0 // end of 0 padding of section name
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.long 0
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.long 0
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.long 0 // SizeOfRawData
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.long 0 // 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 0x42100040 // Characteristics (section flags)
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.ascii ".text"
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.byte 0
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.byte 0
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.byte 0 // end of 0 padding of section name
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.long _edata - _start // VirtualSize
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.long _start - ImageBase // VirtualAddress
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.long _edata - _start // SizeOfRawData
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.long _start - ImageBase // PointerToRawData
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.long 0 // PointerToRelocations (0 for executables)
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.long 0 // PointerToLineNumbers (0 for executables)
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.short 0 // NumberOfRelocations (0 for executables)
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.short 0 // NumberOfLineNumbers (0 for executables)
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.long 0xe0500020 // Characteristics (section flags)
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_start:
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stmfd sp!, {r0-r2, lr}
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mov r2, r0
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mov r3, r1
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adr r1, .L_DYNAMIC
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ldr r0, [r1]
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add r1, r0, r1
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adr r0, ImageBase
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bl _relocate
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teq r0, #0
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bne 0f
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ldmfd sp, {r0-r1}
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bl _entry
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0: add sp, sp, #12
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ldr pc, [sp], #4
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.L_DYNAMIC:
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.word _DYNAMIC - .
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#if defined(__ELF__) && defined(__linux__)
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.section .note.GNU-stack,"",%progbits
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#endif
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