stm32f4.ld

/************************************************************************
 *
 *	 Copyright (c) 2012-2021 PX4 Development Team. All rights reserved.
 *	 Copyright (c) 2010 libopencm3 project (Uwe Hermann, Stephen Caudle)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * LICENSE NOTE FOR EXTERNAL LIBOPENCM3 LIBRARY:
 *
 *	 The PX4 development team considers libopencm3 to be
 *	 still GPL, not LGPL licensed, as it is unclear if
 *	 each and every author agreed to the LGPS -> GPL change.
 *
 ***********************************************************************/

/**
 * @file stm32f4.ld
 *
 * Linker script for ST STM32F4 bootloader (use first 16K of flash, all 128K RAM).
 *
 * @author Uwe Hermann <uwe@hermann-uwe.de>
 * @author Stephen Caudle <scaudle@doceme.com>
 */

/* Define memory regions. */
MEMORY
{
	rom (rx)  : ORIGIN = 0x08000000, LENGTH = 16K
	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 128K
}

/* Enforce emmission of the vector table. */
EXTERN (vector_table)

/* Define sections. */
SECTIONS
{
	. = ORIGIN(rom);

	.text : {
		*(.vectors)		/* Vector table */
		*(.text*)		/* Program code */
		. = ALIGN(4);
		*(.rodata*)		/* Read-only data */
		. = ALIGN(4);
	} >rom

	/* C++ Static constructors/destructors, also used for __attribute__
	 * ((constructor)) and the likes */
	.preinit_array : {
		. = ALIGN(4);
		__preinit_array_start = .;
		KEEP (*(.preinit_array))
		__preinit_array_end = .;
	} >rom
	.init_array : {
		. = ALIGN(4);
		__init_array_start = .;
		KEEP (*(SORT(.init_array.*)))
		KEEP (*(.init_array))
		__init_array_end = .;
	} >rom
	.fini_array : {
		. = ALIGN(4);
		__fini_array_start = .;
		KEEP (*(.fini_array))
		KEEP (*(SORT(.fini_array.*)))
		__fini_array_end = .;
	} >rom

	. = ORIGIN(ram);

	.data : {
		_data = .;
		*(.data*)		/* Read-write initialized data */
		. = ALIGN(4);
		_edata = .;
	} >ram AT >rom

	_data_loadaddr = LOADADDR(.data);

	.bss : {
	_sbss = .;
		*(.bss*)		/* Read-write zero initialized data */
		*(COMMON)
		. = ALIGN(4);
		_ebss = .;
	} >ram

	/*
	 * The .eh_frame section appears to be used for C++ exception handling.
	 * You may need to fix this if you're using C++.
	 */
	/DISCARD/ : { *(.eh_frame) }

	. = ALIGN(4);
	end = .;
}

PROVIDE(_stack = 0x20020000);