2013-01-31 01:25:25 +04:00
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/* crt0-efi-x86_64.S - x86_64 EFI startup code.
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Copyright (C) 1999 Hewlett-Packard Co.
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Contributed by David Mosberger <davidm@hpl.hp.com>.
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Copyright (C) 2005 Intel Co.
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Contributed by Fenghua Yu <fenghua.yu@intel.com>.
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All rights reserved.
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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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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials
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provided with the distribution.
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* Neither the name of Hewlett-Packard Co. nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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.text
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.align 4
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.globl _start
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_start:
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subq $8, %rsp
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pushq %rcx
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pushq %rdx
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0:
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lea ImageBase(%rip), %rdi
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lea _DYNAMIC(%rip), %rsi
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popq %rcx
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popq %rdx
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pushq %rcx
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pushq %rdx
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call _relocate
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popq %rdi
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popq %rsi
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Make ELF constructors and destructors work
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>
2023-03-28 15:28:40 +03:00
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call _entry
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2013-01-31 01:25:25 +04:00
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addq $8, %rsp
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.exit:
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ret
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// hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
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.data
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dummy: .long 0
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#define IMAGE_REL_ABSOLUTE 0
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.section .reloc, "a"
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label1:
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.long dummy-label1 // Page RVA
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2021-04-06 23:35:03 +03:00
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.long 12 // Block Size (2*4+2*2), must be aligned by 32 Bits
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.word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
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2013-01-31 01:25:25 +04:00
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.word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
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2022-08-06 13:16:29 +03:00
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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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