zephyr/include/arch/x86/linker.ld

225 lines
5.4 KiB
Plaintext

/*
* Copyright (c) 2013-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Common linker sections
*
* This script defines the memory location of the various sections that make up
* a Zephyr Kernel image. This file is used by the linker.
*
* This script places the various sections of the image according to what
* features are enabled by the kernel's configuration options.
*
* For a build that does not use the execute in place (XIP) feature, the script
* generates an image suitable for loading into and executing from RAMABLE_REGION by
* placing all the sections adjacent to each other. There is also no separate
* load address for the DATA section which means it doesn't have to be copied
* into RAMABLE_REGION.
*
* For builds using XIP, there is a different load memory address (LMA) and
* virtual memory address (VMA) for the DATA section. In this case the DATA
* section is copied into RAMABLE_REGION at runtime.
*
* When building an XIP image the data section is placed into ROMABLE_REGION. In this
* case, the LMA is set to __data_rom_start so the data section is concatenated
* at the end of the RODATA section. At runtime, the DATA section is copied
* into the RAMABLE_REGION region so it can be accessed with read and write permission.
*
* Most symbols defined in the sections below are subject to be referenced in
* the Zephyr Kernel image. If a symbol is used but not defined the linker will
* emit an undefined symbol error.
*
* Please do not change the order of the section as the kernel expects this
* order when programming the MMU.
*/
#define _LINKER
#define _ASMLANGUAGE
#include <linker-defs.h>
#include <offsets.h>
#include <misc/util.h>
#define MMU_PAGE_SIZE KB(4)
#include <linker-tool.h>
#ifdef CONFIG_XIP
#define ROMABLE_REGION ROM
#define RAMABLE_REGION RAM
#else
#define ROMABLE_REGION RAM
#define RAMABLE_REGION RAM
#endif
/* SECTIONS definitions */
SECTIONS
{
GROUP_START(ROMABLE_REGION)
_image_rom_start = PHYS_LOAD_ADDR;
_image_text_start = PHYS_LOAD_ADDR;
SECTION_PROLOGUE(_TEXT_SECTION_NAME, (OPTIONAL),)
{
. = CONFIG_TEXT_SECTION_OFFSET;
*(.text_start)
*(".text_start.*")
*(.text)
*(".text.*")
*(.gnu.linkonce.t.*)
*(.eh_frame)
*(.init)
*(.fini)
*(.eini)
KEXEC_PGALIGN_PAD(MMU_PAGE_SIZE)
} GROUP_LINK_IN(ROMABLE_REGION)
_image_text_end = .;
#include <linker/common-rom.ld>
SECTION_PROLOGUE(_RODATA_SECTION_NAME, (OPTIONAL),)
{
*(.rodata)
*(".rodata.*")
*(.gnu.linkonce.r.*)
. = ALIGN(8);
_idt_base_address = .;
KEEP(*(staticIdt))
#ifndef CONFIG_X86_FIXED_IRQ_MAPPING
. = ALIGN(4);
_irq_to_interrupt_vector = .;
KEEP(*(irq_int_vector_map))
#endif
#ifdef CONFIG_CUSTOM_RODATA_LD
/* Located in project source directory */
#include <custom-rodata.ld>
#endif
KEXEC_PGALIGN_PAD(MMU_PAGE_SIZE)
} GROUP_LINK_IN(ROMABLE_REGION)
_image_rom_end = .;
__data_rom_start = ALIGN(4); /* XIP imaged DATA ROMABLE_REGION start addr */
GROUP_END(ROMABLE_REGION)
/* RAMABLE_REGION */
GROUP_START(RAMABLE_REGION)
SECTION_DATA_PROLOGUE(_DATA_SECTION_NAME, (OPTIONAL),)
{
KEXEC_PGALIGN_PAD(MMU_PAGE_SIZE)
_image_ram_start = .;
__data_ram_start = .;
*(.top_of_image_ram)
*(.top_of_image_ram.*)
*(.data)
*(".data.*")
#ifdef CONFIG_CUSTOM_RWDATA_LD
/* Located in project source directory */
#include <custom-rwdata.ld>
#endif
. = ALIGN(4);
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
#include <linker/common-ram.ld>
__data_ram_end = .;
SECTION_PROLOGUE(_BSS_SECTION_NAME, (NOLOAD OPTIONAL),)
{
/*
* For performance, BSS section is forced to be both 4 byte aligned and
* a multiple of 4 bytes.
*/
. = ALIGN(4);
__bss_start = .;
*(.bss)
*(".bss.*")
COMMON_SYMBOLS
/*
* As memory is cleared in words only, it is simpler to ensure the BSS
* section ends on a 4 byte boundary. This wastes a maximum of 3 bytes.
*/
. = ALIGN(4);
__bss_end = .;
KEXEC_PGALIGN_PAD(MMU_PAGE_SIZE)
} GROUP_LINK_IN(RAMABLE_REGION)
#ifdef CONFIG_XIP
/*
* Ensure linker keeps sections in correct order, despite the fact
* the previous section specified a load address and this no-load
* section doesn't.
*/
GROUP_FOLLOWS_AT(RAMABLE_REGION)
#endif
SECTION_PROLOGUE(_NOINIT_SECTION_NAME, (NOLOAD OPTIONAL),)
{
/*
* This section is used for non-initialized objects that
* will not be cleared during the boot process.
*/
*(.noinit)
*(".noinit.*")
*(.bottom_of_image_ram)
*(.bottom_of_image_ram.*)
} GROUP_LINK_IN(RAMABLE_REGION)
/* Define linker symbols */
_image_ram_end = .;
_end = .; /* end of image */
. = ALIGN(MMU_PAGE_SIZE);
__bss_num_words = (__bss_end - __bss_start) >> 2;
GROUP_END(RAMABLE_REGION)
/* static interrupts */
SECTION_PROLOGUE(intList, (OPTIONAL),)
{
KEEP(*(.spurIsr))
KEEP(*(.spurNoErrIsr))
__INT_LIST_START__ = .;
LONG((__INT_LIST_END__ - __INT_LIST_START__) / __ISR_LIST_SIZEOF)
KEEP(*(.intList))
KEEP(*(.gnu.linkonce.intList.*))
__INT_LIST_END__ = .;
} > IDT_LIST
#ifdef CONFIG_CUSTOM_SECTIONS_LD
/* Located in project source directory */
#include <custom-sections.ld>
#endif
}
#ifdef CONFIG_XIP
/*
* Round up number of words for DATA section to ensure that XIP copies the
* entire data section. XIP copy is done in words only, so there may be up
* to 3 extra bytes copied in next section (BSS). At run time, the XIP copy
* is done first followed by clearing the BSS section.
*/
__data_size = (__data_ram_end - __data_ram_start);
__data_num_words = (__data_size + 3) >> 2;
#endif