blob: c63728da8379c034a276d7b85d9acb2eddf2647f [file] [log] [blame]
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Linker command/script file
*
* Linker script for the Nios II platform
*/
#define _LINKER
#define _ASMLANGUAGE
#include <autoconf.h>
#include <sections.h>
#include <linker-defs.h>
#include <linker-tool.h>
/* These sections are specific to this CPU */
#define _EXCEPTION_SECTION_NAME exceptions
#define _RESET_SECTION_NAME reset
/* This linker script requires the following macros to be defined in the
* SOC-specfic linker script. All of these values can be found defined
* in system.h for CPU configurations that can generate a HAL.
*
* _RESET_VECTOR CPU entry point at boot
* _EXC_VECTOR General exception vector
* _ROM_ADDR Beginning of flash memory
* _ROM_SIZE Size in bytes of flash memory
* _RAM_ADDR Beginning of RAM
* _RAM_SIZE Size of RAM in bytes
*
* For now we support two scenarios:
*
* 1. Non-XIP systems where the reset vector is at the beginning of RAM
* with the exception vector 0x20 bytes after it.
* 2. XIP systems where the reset vector is at the beginning of ROM and
* the exception vector is in RAM
*/
#ifdef CONFIG_XIP
#define ROMABLE_REGION FLASH
#define RAMABLE_REGION SRAM
#else
#define ROMABLE_REGION SRAM
#define RAMABLE_REGION SRAM
#endif
#ifdef CONFIG_XIP
ASSERT(_RESET_VECTOR == _ROM_ADDR, "Reset vector not at beginning of ROM!")
MEMORY
{
RESET (rx) : ORIGIN = _RESET_VECTOR, LENGTH = 0x20
FLASH (rx) : ORIGIN = _RESET_VECTOR + 0x20 , LENGTH = (_ROM_SIZE - 0x20)
SRAM (wx) : ORIGIN = _EXC_VECTOR, LENGTH = _RAM_SIZE - (_EXC_VECTOR - _RAM_ADDR)
/* Used by and documented in include/linker/intlist.ld */
IDT_LIST (wx) : ORIGIN = 0xFFFFF7FF, LENGTH = 2K
}
#else
MEMORY
{
RESET (wx) : ORIGIN = _RESET_VECTOR, LENGTH = 0x20
SRAM (wx) : ORIGIN = _EXC_VECTOR, LENGTH = _RAM_SIZE - (_EXC_VECTOR - _RAM_ADDR)
/* Used by and documented in include/linker/intlist.ld */
IDT_LIST (wx) : ORIGIN = 0xFFFFF7FF, LENGTH = 2K
}
#endif
SECTIONS
{
GROUP_START(ROMABLE_REGION)
_image_rom_start = _ROM_ADDR;
SECTION_PROLOGUE(_RESET_SECTION_NAME,,)
{
KEEP(*(.reset.*))
} GROUP_LINK_IN(RESET)
#ifndef CONFIG_XIP
SECTION_PROLOGUE(_EXCEPTION_SECTION_NAME,,)
{
KEEP(*(".exception.entry.*"))
*(".exception.other.*")
} GROUP_LINK_IN(ROMABLE_REGION)
#endif
SECTION_PROLOGUE(_TEXT_SECTION_NAME,,)
{
/* XXX If ALT_CPU_RESET_ADDR is not the same as _ROM_ADDR
* we are going to waste flash space? */
. = ALT_CPU_RESET_ADDR;
_image_text_start = .;
*(.text)
*(".text.*")
*(.gnu.linkonce.t.*)
KEEP(*(.openocd_dbg))
KEEP(*(".openocd_dbg.*"))
} GROUP_LINK_IN(ROMABLE_REGION)
_image_text_end = .;
#if defined(CONFIG_GP_ALL_DATA)
_gp = ABSOLUTE(. + 0x8000);
PROVIDE(gp = _gp);
#endif
#include <linker/common-rom.ld>
SECTION_PROLOGUE(_RODATA_SECTION_NAME,,)
{
*(.rodata)
*(".rodata.*")
*(.gnu.linkonce.r.*)
#ifdef CONFIG_CUSTOM_RODATA_LD
/* Located in project source directory */
#include <custom-rodata.ld>
#endif
} GROUP_LINK_IN(ROMABLE_REGION)
_image_rom_end = .;
__data_rom_start = ALIGN(4); /* XIP imaged DATA ROM start addr */
GROUP_END(ROMABLE_REGION)
GROUP_START(RAMABLE_REGION)
#ifdef CONFIG_XIP
/* Altera strongly recommends keeping exception entry code in RAM
* even on XIP systems
*
* This is code not data, but we need this copied just like XIP data
*/
SECTION_DATA_PROLOGUE(_EXCEPTION_SECTION_NAME,,)
{
_image_ram_start = .;
__data_ram_start = .;
KEEP(*(".exception.entry.*"))
*(".exception.other.*")
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
#endif
#ifndef CONFIG_XIP
_image_ram_start = .;
#endif
#include <linker/common-ram.ld>
SECTION_DATA_PROLOGUE(_DATA_SECTION_NAME,,)
{
#ifdef CONFIG_GEN_SW_ISR_TABLE
KEEP(*(SW_ISR_TABLE))
#endif
*(.data)
*(".data.*")
#ifdef CONFIG_CUSTOM_RWDATA_LD
/* Located in project source directory */
#include <custom-rwdata.ld>
#endif
/* the Nios2 architecture only has 16-bit signed immediate offsets in
* the instructions, so accessing a general address requires typically
* three instructions – basically, two for the two halves of the 32-bit
* address, and one to merge them – but if we can put the most commonly
* accessed globals in a special 64K span of memory addressed by the GP
* register, then we can access those values in a single instruction,
* saving both codespace and runtime.
*
* Since these immediate offsets are signed, place gp 0x8000 past the
* beginning of .sdata so that we can use both positive and negative
* offsets.
*/
#if defined(CONFIG_GP_LOCAL) || defined(CONFIG_GP_GLOBAL)
_gp = ABSOLUTE(. + 0x8000);
PROVIDE(gp = _gp);
#endif
*(.sdata .sdata.* .gnu.linkonce.s.*)
*(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
__data_ram_end = .;
SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD),)
{
/*
* For performance, BSS section is assumed to be 4 byte aligned and
* a multiple of 4 bytes
*/
. = ALIGN(4);
__bss_start = .;
*(.sbss)
*(".sbss.*")
*(.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.
*/
__bss_end = ALIGN(4);
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)
SECTION_PROLOGUE(_NOINIT_SECTION_NAME,(NOLOAD),)
{
/*
* This section is used for non-initialized objects that
* will not be cleared during the boot process.
*/
*(.noinit)
*(".noinit.*")
} GROUP_LINK_IN(RAMABLE_REGION)
/* Define linker symbols */
_image_ram_end = .;
_end = .; /* end of image */
GROUP_END(RAMABLE_REGION)
#ifdef CONFIG_CUSTOM_SECTIONS_LD
/* Located in project source directory */
#include <custom-sections.ld>
#endif
#ifdef CONFIG_GEN_ISR_TABLES
#include <linker/intlist.ld>
#endif
}