Subversion Repositories neorv32

/* ################################################################################################# */
/* # << NEORV32 - RISC-V GCC Linker Script >>                                                      # */
/* # ********************************************************************************************* # */
/* # BSD 3-Clause License                                                                          # */
/* #                                                                                               # */
/* # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     # */
/* #                                                                                               # */
/* # Redistribution and use in source and binary forms, with or without modification, are          # */
/* # permitted provided that the following conditions are met:                                     # */
/* #                                                                                               # */
/* # 1. Redistributions of source code must retain the above copyright notice, this list of        # */
/* #    conditions and the following disclaimer.                                                   # */
/* #                                                                                               # */
/* # 2. Redistributions in binary form must reproduce the above copyright notice, this list of     # */
/* #    conditions and the following disclaimer in the documentation and/or other materials        # */
/* #    provided with the distribution.                                                            # */
/* #                                                                                               # */
/* # 3. Neither the name of the copyright holder nor the names of its contributors may be used to  # */
/* #    endorse or promote products derived from this software without specific prior written      # */
/* #    permission.                                                                                # */
/* #                                                                                               # */
/* # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS   # */
/* # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF               # */
/* # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    # */
/* # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,     # */
/* # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE # */
/* # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED    # */
/* # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     # */
/* # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED  # */
/* # OF THE POSSIBILITY OF SUCH DAMAGE.                                                            # */
/* # ********************************************************************************************* # */
/* # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting # */
/* ################################################################################################# */

/* Default linker script, for normal executables */
/* Copyright (C) 2014-2020 Free Software Foundation, Inc.
   Copying and distribution of this script, with or without modification,
   are permitted in any medium without royalty provided the copyright
   notice and this notice are preserved.  */

/* modified for the NEORV32 processor by Stephan Nolting */


OUTPUT_FORMAT("elf32-littleriscv", "elf32-littleriscv", "elf32-littleriscv")
OUTPUT_ARCH(riscv)
ENTRY(_start)
SEARCH_DIR("/opt/riscv/riscv32-unknown-elf/lib"); SEARCH_DIR("=/opt/riscv/riscv64-unknown-linux-gnu/lib"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib"); SEARCH_DIR("=/usr/lib");

/* ************************************************************************* */
/* NEORV32 memory configuration.                                             */
/* Make sure this is sync with your processor/memory hardware configuration! */
/* ************************************************************************* */
/* "rom"   : instruction memory (IMEM) / bootloader ROM                      */
/* "ram"   : data memory (DMEM)                                              */
/* "iodev" : peripheral/IO devices (not used here; passed to crt0)           */
/* ************************************************************************* */
MEMORY
{
/* "rom" section: first value of ORIGIN/LENGTH => bootloader ROM; second value of ORIGIN/LENGTH => instruction memory */

  rom  (rx)  : ORIGIN = DEFINED(make_bootloader) ? 0xFFFF0000 : 0x00000000, LENGTH = DEFINED(make_bootloader) ? 4*1024 : 16*1024
  ram (rwx)  : ORIGIN = 0x80000000, LENGTH = 8*1024
  iodev (rw) : ORIGIN = 0xFFFFFF00, LENGTH = 256

}
/* ************************************************************************* */

SECTIONS
{
  /* stack pointer init: last 32-bit entry in data memory */
  __crt0_stack_begin = (ORIGIN(ram) + LENGTH(ram)) - 4;

  /* start section on WORD boundary */
  . = ALIGN(4);

  .interp         : { *(.interp) }
  .note.gnu.build-id  : { *(.note.gnu.build-id) }
  .hash           : { *(.hash) }
  .gnu.hash       : { *(.gnu.hash) }
  .dynsym         : { *(.dynsym) }
  .dynstr         : { *(.dynstr) }
  .gnu.version    : { *(.gnu.version) }
  .gnu.version_d  : { *(.gnu.version_d) }
  .gnu.version_r  : { *(.gnu.version_r) }
  .rela.init      : { *(.rela.init) }
  .rela.text      : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
  .rela.fini      : { *(.rela.fini) }
  .rela.rodata    : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
  .rela.data.rel.ro   : { *(.rela.data.rel.ro .rela.data.rel.ro.* .rela.gnu.linkonce.d.rel.ro.*) }
  .rela.data      : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
  .rela.tdata     : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
  .rela.tbss      : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
  .rela.ctors     : { *(.rela.ctors) }
  .rela.dtors     : { *(.rela.dtors) }
  .rela.got       : { *(.rela.got) }
  .rela.sdata     : { *(.rela.sdata .rela.sdata.* .rela.gnu.linkonce.s.*) }
  .rela.sbss      : { *(.rela.sbss .rela.sbss.* .rela.gnu.linkonce.sb.*) }
  .rela.sdata2    : { *(.rela.sdata2 .rela.sdata2.* .rela.gnu.linkonce.s2.*) }
  .rela.sbss2     : { *(.rela.sbss2 .rela.sbss2.* .rela.gnu.linkonce.sb2.*) }
  .rela.bss       : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
  /* Actual instructions */
  .text :
  {
    PROVIDE(__text_start = .);
    PROVIDE(__textstart = .);

    PROVIDE_HIDDEN (__rela_iplt_start = .);
    *(.rela.iplt)
    PROVIDE_HIDDEN (__rela_iplt_end = .);

    *(.rela.plt)

    KEEP(*(.text.boot)); /* keep start-up code at the beginning of rom */

    KEEP (*(SORT_NONE(.init)))

    *(.text.unlikely .text.*_unlikely .text.unlikely.*)
    *(.text.exit .text.exit.*)
    *(.text.startup .text.startup.*)
    *(.text.hot .text.hot.*)
    *(SORT(.text.sorted.*))
    *(.text .stub .text.* .gnu.linkonce.t.*)
    /* .gnu.warning sections are handled specially by elf.em.  */
    *(.gnu.warning)

    KEEP (*(SORT_NONE(.fini)))

    /* gcc uses crtbegin.o to find the start of
       the constructors, so we make sure it is
       first.  Because this is a wildcard, it
       doesn't matter if the user does not
       actually link against crtbegin.o; the
       linker won't look for a file to match a
       wildcard.  The wildcard also means that it
       doesn't matter which directory crtbegin.o
       is in.  */
    KEEP (*crtbegin.o(.ctors))
    KEEP (*crtbegin?.o(.ctors))
    /* We don't want to include the .ctor section from
       the crtend.o file until after the sorted ctors.
       The .ctor section from the crtend file contains the
       end of ctors marker and it must be last */
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
    KEEP (*(SORT(.ctors.*)))
    KEEP (*(.ctors))

    KEEP (*crtbegin.o(.dtors))
    KEEP (*crtbegin?.o(.dtors))
    KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
    KEEP (*(SORT(.dtors.*)))
    KEEP (*(.dtors))

    /* finish section on WORD boundary */
    . = ALIGN(4);

    PROVIDE (__etext = .);
    PROVIDE (_etext = .);
    PROVIDE (etext = .);
  } > rom


  /* read-only data, appended to text */
  .rodata         : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
  .rodata1        : { *(.rodata1) }
  .rodata :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
    KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
    PROVIDE_HIDDEN (__init_array_end = .);

    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
    KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
    PROVIDE_HIDDEN (__fini_array_end = .);

    /* finish section on WORD boundary */
    . = ALIGN(4);
  } > rom


  /* initialized read/write data, accessed in RAM, placed in ROM, copied during boot */
  .jcr            : { KEEP (*(.jcr)) }
  .data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro .data.rel.ro.* .gnu.linkonce.d.rel.ro.*) }
  .dynamic        : { *(.dynamic) }
  .data1          : { *(.data1) }
  .got            : { *(.got.plt) *(.igot.plt) *(.got) *(.igot) }
  .data :
  {
    __DATA_BEGIN__ = .;
    __SDATA_BEGIN__ = .;
    *(.sdata2 .sdata2.* .gnu.linkonce.s2.*)

    *(.data .data.* .gnu.linkonce.d.*)
    SORT(CONSTRUCTORS)

    /* We want the small data sections together, so single-instruction offsets
       can access them all, and initialized data all before uninitialized, so
       we can shorten the on-disk segment size.  */

    *(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata .srodata.*)
    *(.sdata .sdata.* .gnu.linkonce.s.*)

     PROVIDE_HIDDEN (__tdata_start = .);
     *(.tdata .tdata.* .gnu.linkonce.td.*)


    /* finish section on WORD boundary */
    . = ALIGN(4);

    _edata = .; PROVIDE (edata = .);
    . = .;

  } > ram AT > rom


  /* zero/non-initialized read/write data placed in RAM */
  .sbss2          : { *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*) }
  .tbss           : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
  .bss (NOLOAD):
  {
    __bss_start = .;
    *(.dynsbss)
    *(.sbss .sbss.* .gnu.linkonce.sb.*)
    *(.scommon)

    *(.dynbss)
    *(.bss .bss.* .gnu.linkonce.b.*)

    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array))
    PROVIDE_HIDDEN (__preinit_array_end = .);

    *(COMMON)
    /* Align here to ensure that the .bss section occupies space up to
       _end.  Align after .bss to ensure correct alignment even if the
       .bss section disappears because there are no input sections.
       FIXME: Why do we need it? When there is no .bss section, we do not
       pad the .data section.  */
    . = ALIGN(. != 0 ? 32 / 8 : 1);

    . = ALIGN(32 / 8);
    __BSS_END__ = .;
    __global_pointer$ = MIN(__SDATA_BEGIN__ + 0x800,
                            MAX(__DATA_BEGIN__ + 0x800, __BSS_END__ - 0x800));
    _end = .; PROVIDE (end = .);
  } > ram


  /* Stabs debugging sections.  */
  .stab          0 : { *(.stab) }
  .stabstr       0 : { *(.stabstr) }
  .stab.excl     0 : { *(.stab.excl) }
  .stab.exclstr  0 : { *(.stab.exclstr) }
  .stab.index    0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment       0 : { *(.comment) }
  .gnu.build.attributes : { *(.gnu.build.attributes .gnu.build.attributes.*) }
  /* DWARF debug sections.
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section so we begin them at 0.  */
  /* DWARF 1 */
  .debug          0 : { *(.debug) }
  .line           0 : { *(.line) }
  /* GNU DWARF 1 extensions */
  .debug_srcinfo  0 : { *(.debug_srcinfo) }
  .debug_sfnames  0 : { *(.debug_sfnames) }
  /* DWARF 1.1 and DWARF 2 */
  .debug_aranges  0 : { *(.debug_aranges) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  /* DWARF 2 */
  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
  .debug_abbrev   0 : { *(.debug_abbrev) }
  .debug_line     0 : { *(.debug_line .debug_line.* .debug_line_end) }
  .debug_frame    0 : { *(.debug_frame) }
  .debug_str      0 : { *(.debug_str) }
  .debug_loc      0 : { *(.debug_loc) }
  .debug_macinfo  0 : { *(.debug_macinfo) }
  /* SGI/MIPS DWARF 2 extensions */
  .debug_weaknames 0 : { *(.debug_weaknames) }
  .debug_funcnames 0 : { *(.debug_funcnames) }
  .debug_typenames 0 : { *(.debug_typenames) }
  .debug_varnames  0 : { *(.debug_varnames) }
  /* DWARF 3 */
  .debug_pubtypes 0 : { *(.debug_pubtypes) }
  .debug_ranges   0 : { *(.debug_ranges) }
  /* DWARF Extension.  */
  .debug_macro    0 : { *(.debug_macro) }
  .debug_addr     0 : { *(.debug_addr) }
  .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
  /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }


  /* Provide further symbols for neorv32 crt0 */
  PROVIDE(__crt0_bss_start   = __bss_start);
  PROVIDE(__crt0_bss_end     = __BSS_END__);
  PROVIDE(__crt0_copy_data_src_begin = __etext + SIZEOF(.rodata));
  PROVIDE(__crt0_copy_data_dst_begin = __DATA_BEGIN__);
  PROVIDE(__crt0_copy_data_dst_end   = __DATA_BEGIN__ + SIZEOF(.data));
  PROVIDE(__ctr0_io_space_begin = ORIGIN(iodev));
  PROVIDE(__ctr0_io_space_end   = ORIGIN(iodev) + LENGTH(iodev));
}