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/* $OpenBSD: ld.script,v 1.17 2021/03/07 23:10:54 mortimer 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 FLAGS (4);
data PT_LOAD;
bss PT_LOAD;
openbsd_randomize PT_OPENBSD_RANDOMIZE;
}
/*
* 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 = 0xffffffff80000000;
__kernel_virt_base = __kernel_base + 0x1000000;
__kernel_phys_base = 0x1000000;
__kernel_virt_to_phys = __kernel_phys_base - __kernel_virt_base;
ENTRY(start)
SECTIONS
{
.text ALIGN(__kernel_virt_base + SIZEOF_HEADERS, __ALIGN_SIZE) :
AT (ALIGN(__kernel_phys_base + SIZEOF_HEADERS, __ALIGN_SIZE))
{
start = .;
locore0.o(.text)
*(.text .text.*)
. = ALIGN(__ALIGN_SIZE);
__text_page_start = ABSOLUTE(.);
*(.ktext.page)
__text_page_end = ABSOLUTE(.);
} :text =0xcccccccc
. = ALIGN(__ALIGN_SIZE);
__kernel_kutext_phys = . + __kernel_virt_to_phys;
.kutext : AT (__kernel_kutext_phys)
{
__kutext_start = ABSOLUTE(.);
*(.kutext)
__kutext_end = ABSOLUTE(.);
} :text =0xcccccccc
. = ALIGN(__ALIGN_SIZE);
__kernel_cptext_phys = . + __kernel_virt_to_phys;
.cptext : AT (__kernel_cptext_phys)
{
__cptext_start = ABSOLUTE(.);
*(.cptext)
__cptext_end = ABSOLUTE(.);
} :text =0xcccccccc
PROVIDE (etext = .);
_etext = .;
/* Move rodata to the next page, so we can nuke X and W bit on them */
. = ALIGN(__ALIGN_SIZE);
__kernel_rodata_phys = . + __kernel_virt_to_phys;
.rodata : AT (__kernel_rodata_phys)
{
__rodata_start = ABSOLUTE(.);
*(.rodata .rodata.*)
*(.codepatch)
*(.codepatchend)
} :rodata =0xcccccccc
. = ALIGN(__ALIGN_SIZE);
__kernel_kutext_page_phys = . + __kernel_virt_to_phys;
.kutext.page : AT (__kernel_kutext_page_phys)
{
*(SORT_BY_ALIGNMENT(.kutext.page))
} :rodata =0xcccccccc
. = ALIGN(0x1000);
__kernel_randomdata_phys = . + __kernel_virt_to_phys;
.openbsd.randomdata : AT (__kernel_randomdata_phys)
{
__retguard_start = ABSOLUTE(.);
__retguard_start_phys = . + __kernel_virt_to_phys;
*(.openbsd.randomdata.retguard .openbsd.randomdata.retguard.*)
. = ALIGN(__ALIGN_SIZE);
__retguard_end = ABSOLUTE(.);
__retguard_end_phys = . + __kernel_virt_to_phys;
*(.openbsd.randomdata .openbsd.randomdata.*)
} :rodata :openbsd_randomize =0xcccccccc
. = ALIGN(0x1000);
PROVIDE (erodata = .);
_erodata = .;
/* Move data to the next page, so we can add W bit on them */
. = ALIGN(__ALIGN_SIZE);
__kernel_data_phys = . + __kernel_virt_to_phys;
.data : AT (__kernel_data_phys)
{
__data_start = ABSOLUTE(.);
*(.data .data.*)
} :data =0xcccccccc
. = ALIGN(__ALIGN_SIZE);
__kernel_kudata_phys = . + __kernel_virt_to_phys;
.kudata : AT (__kernel_kudata_phys)
{
__kudata_start = ABSOLUTE(.);
*(.kudata)
__kudata_end = ABSOLUTE(.);
} :data =0xcccccccc
. = ALIGN(0x1000);
PROVIDE (edata = .);
_edata = .;
/* BSS starts right after padded data */
__kernel_bss_phys = . + __kernel_virt_to_phys;
.bss : AT (__kernel_bss_phys)
{
*(.bss .bss.*)
*(COMMON)
/* Align after .bss to ensure correct alignment even if the
* .bss section disappears because there are no input sections.
*/
. = ALIGN(0x1000);
} :bss
__kernel_bss_end = .;
. = ALIGN(0x200000);
_end = .;
PROVIDE (end = .);
__kernel_phys_end = . + __kernel_virt_to_phys;
/* XXX - hack alert, since we are not C++, nuke these */
/DISCARD/ :
{
*(.note.GNU-stack)
*(.eh_frame)
}
}
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