306 lines
9.4 KiB
Plaintext
306 lines
9.4 KiB
Plaintext
/****************************************************************************
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* configs/nr5m100-nexys4/scripts/ld.script
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*
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* Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
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* Copyright (C) 2016 Ken Pettit.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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* Ken Pettit <pettitkd@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/*======================================================================*/
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/* Linker script for nr5m100_nexys board */
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/*======================================================================*/
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/*----------------------------------------------------------------------*/
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/* Setup */
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/*----------------------------------------------------------------------*/
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/* The OUTPUT_ARCH command specifies the machine architecture where the
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argument is one of the names used in the BFD library. More
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specifically one of the entires in bfd/cpu-mips.c */
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OUTPUT_ARCH( "riscv" )
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/* Define the memory regions were we put stuff */
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MEMORY
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{
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sram (rwx) : ORIGIN = 0x20000000, LENGTH = 384K
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}
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stack_size = 4096;
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/* Define the beginning and ending stack */
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__stack_start = ORIGIN(sram) + LENGTH(sram);
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__stack_end = __stack_start - stack_size;
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/* The ENTRY command specifies the entry point (ie. first instruction to
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execute). The symbol _start is defined in crt0.S */
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ENTRY( __reset )
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/* The GROUP command is special since the listed archives will be
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searched repeatedly until there are no new undefined references. We
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need this since -lc depends on -lgloss and -lgloss depends on -lc. I
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thought gcc would automatically include -lgcc when needed, but
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idt32.ld includes it explicitly here and I was seeing link errors
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without it. */
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/*GROUP( -lc -lgloss -lgcc ) */
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GROUP( -lc )
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/*----------------------------------------------------------------------*/
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/* Sections */
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/*----------------------------------------------------------------------*/
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/* This is where we specify how the input sections map to output
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sections. The .= commands set the location counter, and the
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sections are inserted in increasing address order according to the
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location counter. The following statement will take all of the .bar
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input sections and reloate them into the .foo output section which
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starts at address 0x1000.
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. = 0.x1000;
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.foo : { *(.bar) }
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If we wrap an input specification with a KEEP command then it
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prevents it from being eliminted during "link-time garbage
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collection". I'm not sure what this is, so I just followed what was
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done in idt32.ld.
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We can also set a global external symbol to a specific address in the
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output binary with this syntax:
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_etext = .;
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PROVIDE( etext = . );
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This will set the global symbol _ftext to the current location. If we
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wrap this in a PROVIDE commad, the symbol will only be set if it is
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not defined. We do this with symbols which don't begin with an
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underscore since technically in ansi C someone might have a function
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with the same name (eg. etext).
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If we need to label the beginning of a section we need to make sure
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that the linker doesn't insert an orphan section inbetween where we
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set the symbol and the actual begining of the section. We can do that
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by assigning the location dot to itself.
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. = .
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_ftext = .;
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.text :
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{ }
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*/
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SECTIONS
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{
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/*--------------------------------------------------------------------*/
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/* Startup vectors
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/*--------------------------------------------------------------------*/
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. = 0x20000000;
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_vectors = .;
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/* vectors: Program code section */
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.vectors :
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{
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*(.text.vec)
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*(.text.vec.*)
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*(.gnu.linkonce.t.*)
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}
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_evectors = .;
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/*--------------------------------------------------------------------*/
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/* Code and read-only segment */
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/*--------------------------------------------------------------------*/
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/* Begining of code and text segment */
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. = 0x20000030;
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_ftext = .;
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PROVIDE( eprol = . );
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/* text: Program code section */
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.text :
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{
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_stext = ABSOLUTE(.);
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*(.text)
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*(.text.*)
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*(.gnu.linkonce.t.*)
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}
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/* init: Code to execute before main (called by crt0.S) */
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.init :
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{
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KEEP( *(.init) )
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}
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/* fini: Code to execute after main (called by crt0.S) */
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.fini :
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{
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KEEP( *(.fini) )
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}
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/* rodata: Read-only data */
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_rodata = .;
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.rodata :
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{
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*(.rdata)
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*(.rodata)
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*(.rodata.*)
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*(.gnu.linkonce.r.*)
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}
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/* End of code and read-only segment */
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PROVIDE( etext = . );
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_etext = .;
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/*--------------------------------------------------------------------*/
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/* Global constructor/destructor segement */
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/*--------------------------------------------------------------------*/
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.preinit_array :
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{
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PROVIDE_HIDDEN (__preinit_array_start = .);
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KEEP (*(.preinit_array))
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PROVIDE_HIDDEN (__preinit_array_end = .);
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}
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.init_array :
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{
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PROVIDE_HIDDEN (__init_array_start = .);
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KEEP (*(SORT(.init_array.*)))
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KEEP (*(.init_array ))
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PROVIDE_HIDDEN (__init_array_end = .);
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}
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.fini_array :
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{
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PROVIDE_HIDDEN (__fini_array_start = .);
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KEEP (*(SORT(.fini_array.*)))
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KEEP (*(.fini_array ))
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PROVIDE_HIDDEN (__fini_array_end = .);
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}
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/*--------------------------------------------------------------------*/
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/* Other misc gcc segments (this was in idt32.ld) */
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/*--------------------------------------------------------------------*/
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/* I am not quite sure about these sections but it seems they are for
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C++ exception handling. I think .jcr is for "Java Class
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Registration" but it seems to end up in C++ binaries as well. */
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.eh_frame_hdr : { *(.eh_frame_hdr) }
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.eh_frame : { KEEP( *(.eh_frame) ) }
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.gcc_except_table : { *(.gcc_except_table) }
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.jcr : { KEEP (*(.jcr)) }
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/*--------------------------------------------------------------------*/
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/* Initialized data segment */
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/*--------------------------------------------------------------------*/
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/* Start of initialized data segment */
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. = ALIGN(16);
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_fdata = .;
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/* data: Writable data */
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_sdata = .;
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.data :
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{
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*(.data)
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*(.data.*)
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*(.gnu.linkonce.d.*)
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}
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/* End of initialized data segment */
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PROVIDE( edata = . );
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_edata = .;
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/* Have _gp point to middle of sdata/sbss to maximize displacement range */
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. = ALIGN(16);
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_gp = . + 0x7FF0;
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/* Writable small data segment */
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.sdata :
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{
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*(.sdata)
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*(.sdata.*)
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*(.srodata.*)
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. = ALIGN(16);
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*(.gnu.linkonce.s.*)
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}
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/*--------------------------------------------------------------------*/
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/* Uninitialized data segment */
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/*--------------------------------------------------------------------*/
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/* Start of uninitialized data segment */
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. = ALIGN(8);
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_fbss = .;
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/* Writable uninitialized small data segment */
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.sbss :
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{
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*(.sbss)
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*(.sbss.*)
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*(.gnu.linkonce.sb.*)
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}
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/* bss: Uninitialized writeable data section */
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. = .;
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_bss_start = .;
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.bss :
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{
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*(.bss)
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*(.bss.*)
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*(.gnu.linkonce.b.*)
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*(COMMON)
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}
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_bss_end = .;
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_ebss = .;
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/* End of uninitialized data segment (used by syscalls.c for heap) */
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. = ALIGN(16);
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PROVIDE( end = . );
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_end = ALIGN(16);
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_info 0 : { *(.debug_info) }
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.debug_line 0 : { *(.debug_line) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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.debug_aranges 0 : { *(.debug_aranges) }
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}
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