77 lines
3.0 KiB
Plaintext
77 lines
3.0 KiB
Plaintext
/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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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, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder 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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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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OUTPUT_FORMAT("elf32-i386")
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ENTRY(start)
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SECTIONS {
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/*
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OS-Dev Wiki says it is common for kernels to start at 1M. Addresses before that
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are used by BIOS/EFI, the bootloader and memory-mapped I/O.
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The UEFI GenFw program inserts a 0x240-byte offset between the image base and
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the .text section. We add that same offset here to align the symbols in the
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UEFI DLL with those in the final UEFI binary to make debugging easier. We also
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apply 32-byte alignments to sections rather than more conventional 4K-byte
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alignments to avoid symbols being shifted from the intermediate DLL to the
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final UEFI image as would occur if the GenFw program shifted the .text section
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from a higher, 4K-aligned offset to the 0x240-byte offset from the image base.
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Such shifting may make debugging more difficult by preventing the DLL from
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being a directly-useful source of symbol information. The debugging symbols
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are not included in the final UEFI image. The GenFw program uses a minimum
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section alignment of 32 bytes, so smaller alignment granularities may also
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result in symbol perturbation.
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*/
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. = 1M + 0x240;
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.text ALIGN (32) :
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{
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KEEP(*(.multiboot))
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*(.text*)
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}
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.rodata ALIGN (32) :
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{
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*(.rodata*)
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}
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.data ALIGN (32) :
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{
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*(.data*)
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}
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.bss ALIGN (32) :
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{
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*(COMMON)
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*(.bss*)
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}
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}
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