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/* $OpenBSD: kern.ldscript,v 1.1 2009/08/13 13:35:54 weingart Exp $ */
/*
* Copyright (c) 2009 Tobias Weingartner <weingart@tepid.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
/* Define how we want out ELF binary to look like. */
PHDRS
{
text PT_LOAD FILEHDR PHDRS;
rodata PT_LOAD;
data PT_LOAD;
bss PT_LOAD;
}
/*
* If we want the text/rodata/data sections aligned on 2M boundaries,
* we could use the following instead. Note, file size would increase
* due to necessary padding.
*
*__ALIGN_SIZE = 0x200000;
*/
__ALIGN_SIZE = 0x1000;
__kernel_base_virt = 0xffffffff80100000 + SIZEOF_HEADERS;
__kernel_base_phys = __kernel_base_virt & 0x7fffffff;
/* We use physical address to jump to kernel */
start_phys = LOADADDR(.text) + (start - __kernel_base_virt);
ENTRY(start_phys)
SECTIONS
{
__kernel_text_virt = __kernel_base_virt;
__kernel_text_phys = __kernel_base_phys;
.text (__kernel_text_virt) : AT (__kernel_text_phys)
{
__text_start = ABSOLUTE(.) & 0xfffffffffffff000;
__text_size = SIZEOF(.text);
__text_load = LOADADDR(.text);
locore.o(.text)
*(.text .text.*)
} :text
PROVIDE (__etext = .);
PROVIDE (etext = .);
_etext = .;
/* Move rodata to the next page, so we can nuke X and W bit on them */
. = ALIGN(__ALIGN_SIZE);
__kernel_rodata_virt = .;
__kernel_rodata_phys = . & 0x7fffffff;
.rodata (__kernel_rodata_virt) : AT (__kernel_rodata_phys)
{
__rodata_start = ABSOLUTE(.);
__rodata_size = SIZEOF(.rodata);
__rodata_load = LOADADDR(.rodata);
*(.rodata .rodata.*)
} :rodata
PROVIDE (erodata = .);
_erodata = .;
/* Move data to the next page, so we can add W bit on them */
. = ALIGN(__ALIGN_SIZE);
__kernel_data_virt = .;
__kernel_data_phys = . & 0x7fffffff;
.data (__kernel_data_virt) : AT (__kernel_data_phys)
{
__data_start = ABSOLUTE(.);
__data_size = SIZEOF(.data);
__data_load = LOADADDR(.data);
*(.data .data.*)
} :data
. = ALIGN(0x1000);
PROVIDE (edata = .);
_edata = .;
/* BSS starts right after padded data */
__kernel_bss_virt = .;
__kernel_bss_phys = . & 0x7fffffff;
.bss (__kernel_bss_virt) : AT (__kernel_bss_phys)
{
__bss_start = ABSOLUTE(.);
__bss_size = SIZEOF(.bss);
__bss_load = LOADADDR(.bss);
*(.bss .bss.*)
*(COMMON)
/* Align here to ensure that the .bss section occupies space
* up to _end. Align after .bss to ensure correct alignment
* even if the .bss section disappears because there are no
* input sections.
*/
. = ALIGN(64 / 8);
} :bss
. = ALIGN(64 / 8);
_end = .;
PROVIDE (end = .);
/* XXX - hack alert, since we are not C++, nuke these */
/DISCARD/ :
{
*(.note.GNU-stack)
*(.eh_frame)
}
}
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