/* SPDX-License-Identifier: GPL-2.0 */
/* ld script to make ARM Linux kernel
* taken from the i386 version by Russell King
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*/
/* No __ro_after_init data in the .rodata section - which will always be ro */
#define RO_AFTER_INIT_DATA
#include <linux/sizes.h>
#include <asm/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
#include <asm/page.h>
#include <asm/mpu.h>
OUTPUT_ARCH(arm)
ENTRY(stext)
#ifndef __ARMEB__
jiffies = jiffies_64;
#else
jiffies = jiffies_64 + 4;
#endif
SECTIONS
{
/*
* XXX: The linker does not define how output sections are
* assigned to input sections when there are multiple statements
* matching the same input section name. There is no documented
* order of matching.
*
* unwind exit sections must be discarded before the rest of the
* unwind sections get included.
*/
/DISCARD/ : {
ARM_DISCARD
*(.alt.smp.init)
*(.pv_table)
#ifndef CONFIG_ARM_UNWIND
*(.ARM.exidx) *(.ARM.exidx.*)
*(.ARM.extab) *(.ARM.extab.*)
#endif
}
. = XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR);
_xiprom = .;
/* XIP ROM area to be mapped */
.head.text : {
_text = .;
HEAD_TEXT
}
.text : {
/* Real text segment */
_stext = .;
/* Text and read-only data */
ARM_TEXT
}
RO_DATA(PAGE_SIZE)
. =
ALIGN(4);
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
__start___ex_table = .;
ARM_MMU_KEEP(*(__ex_table))
__stop___ex_table = .;
}
#ifdef CONFIG_ARM_UNWIND
ARM_UNWIND_SECTIONS
#endif
_etext = .;
/* End of text and rodata section */
ARM_VECTORS
INIT_TEXT_SECTION(8)
.exit.text : {
ARM_EXIT_KEEP(EXIT_TEXT)
}
.init.proc.info : {
ARM_CPU_DISCARD(PROC_INFO)
}
.init.arch.info : {
__arch_info_begin = .;
KEEP(*(.arch.info.init))
__arch_info_end = .;
}
.init.tagtable : {
__tagtable_begin = .;
*(.taglist.init)
__tagtable_end = .;
}
.init.rodata : {
INIT_SETUP(16)
INIT_CALLS
CON_INITCALL
INIT_RAM_FS
}
#ifdef CONFIG_ARM_MPU
. =
ALIGN(SZ_128K);
#endif
_exiprom = .;
/* End of XIP ROM area */
/*
* From this point, stuff is considered writable and will be copied to RAM
*/
__data_loc =
ALIGN(4);
/* location in file */
. = PAGE_OFFSET + TEXT_OFFSET;
/* location in memory */
#undef LOAD_OFFSET
#define LOAD_OFFSET (PAGE_OFFSET + TEXT_OFFSET - __data_loc)
. =
ALIGN(THREAD_SIZE);
_sdata = .;
RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
.
data.ro_after_init : AT(ADDR(.
data.ro_after_init) - LOAD_OFFSET) {
*(.
data..ro_after_init)
}
_edata = .;
. =
ALIGN(PAGE_SIZE);
__init_begin = .;
.init.
data : AT(ADDR(.init.
data) - LOAD_OFFSET) {
INIT_DATA
}
.exit.
data : AT(ADDR(.exit.
data) - LOAD_OFFSET) {
ARM_EXIT_KEEP(EXIT_DATA)
}
#ifdef CONFIG_SMP
PERCPU_SECTION(L1_CACHE_BYTES)
#endif
#ifdef CONFIG_HAVE_TCM
ARM_TCM
#endif
/*
* End of copied data. We need a dummy section to get its LMA.
* Also located before final ALIGN() as trailing padding is not stored
* in the resulting binary file and useless to copy.
*/
.
data.endmark : AT(ADDR(.
data.endmark) - LOAD_OFFSET) { }
_edata_loc = LOADADDR(.
data.endmark);
. =
ALIGN(PAGE_SIZE);
__init_end = .;
BSS_SECTION(0, 0, 8)
#ifdef CONFIG_ARM_MPU
. =
ALIGN(PMSAv8_MINALIGN);
#endif
_end = .;
STABS_DEBUG
DWARF_DEBUG
ARM_DETAILS
ARM_ASSERTS
}
/*
* These must never be empty
* If you have to comment these two assert statements out, your
* binutils is too old (for other reasons as well)
*/
ASSERT((__proc_info_end - __proc_info_begin),
"missing CPU support")
#ifndef CONFIG_COMPILE_TEST
ASSERT((__arch_info_end - __arch_info_begin),
"no machine record defined")
#endif
#ifdef CONFIG_XIP_DEFLATED_DATA
/*
* The .bss is used as a stack area for __inflate_kernel_data() whose stack
* frame is 9568 bytes. Make sure it has extra room left.
*/
ASSERT((_end - __bss_start) >= 12288,
".bss too small for CONFIG_XIP_DEFLATED_DATA")
#endif
#if defined(CONFIG_ARM_MPU) &&
!defined(CONFIG_COMPILE_TEST)
/*
* Due to PMSAv7 restriction on base address and size we have to
* enforce minimal alignment restrictions. It was seen that weaker
* alignment restriction on _xiprom will likely force XIP address
* space spawns multiple MPU regions thus it is likely we run in
* situation when we are reprogramming MPU region we run on with
* something which doesn't cover reprogramming code itself, so as soon
* as we update MPU settings we'd immediately try to execute straight
* from background region which is XN.
* It seem that alignment in 1M should suit most users.
* _exiprom is aligned as 1/8 of 1M so can be covered by subregion
* disable
*/
ASSERT(
!(_xiprom & (SZ_1M - 1)), "XIP start address may cause MPU programming issues")
ASSERT(
!(_exiprom & (SZ_128K - 1)), "XIP end address may cause MPU programming issues")
#endif
