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/*
* bubbl
* Copyright (C) 2024-2025 Raghuram Subramani <raghus2247@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* The bootloader will look at this image and start execution at the symbol
designated as the entry point. */
ENTRY(_start)
/* Tell where the various sections of the object files will be put in the final
kernel image. */
SECTIONS
{
/* It used to be universally recommended to use 1M as a start offset,
as it was effectively guaranteed to be available under BIOS systems.
However, UEFI has made things more complicated, and experimental data
strongly suggests that 2M is a safer place to load. In 2016, a new
feature was introduced to the multiboot2 spec to inform bootloaders
that a kernel can be loaded anywhere within a range of addresses and
will be able to relocate itself to run from such a loader-selected
address, in order to give the loader freedom in selecting a span of
memory which is verified to be available by the firmware, in order to
work around this issue. This does not use that feature, so 2M was
chosen as a safer option than the traditional 1M. */
. = 2M;
kernel_start = .;
/* First put the multiboot header, as it is required to be put very early
in the image or the bootloader won't recognize the file format.
Next we'll put the .text section. */
.text : ALIGN(4K)
{
*(.multiboot)
*(.text)
*(.init)
*(.fini)
*(.ctors)
*(.dtors)
}
/* Read-only data. */
.rodata : ALIGN(4K)
{
*(.rodata*)
}
/* Read-write data (initialized) */
.data : ALIGN(4K)
{
*(.data*)
}
/* Read-write data (uninitialized) and stack */
.bss : ALIGN(4K)
{
*(COMMON)
*(.bss)
}
.debug : ALIGN(4K)
{
*(.comment)
*(.debug*)
}
.eh_frame : ALIGN(4K)
{
*(.eh_frame)
}
kernel_end = .;
}
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