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