ld/scripttempl/elf32cr16.sc

   1 # Linker Script for National Semiconductor's CR16-ELF32.
   2 #
   3 # Copyright (C) 2014-2021 Free Software Foundation, Inc.
   4 #
   5 # Copying and distribution of this file, with or without modification,
   6 # are permitted in any medium without royalty provided the copyright
   7 # notice and this notice are preserved.
   8
   9 # Using an empty script for ld -r is better than mashing together
  10 # sections.  This hack likely leaves ld -Ur broken.
  11 test -n "${RELOCATING}" || exit 0
  12
  13 # The next line should be uncommented if it is desired to link
  14 # without libstart.o and directly enter main.
  15
  16 # ENTRY=_main
  17
  18 test -z "$ENTRY" && ENTRY=_start
  19 cat <<EOF
  20
  21 /* Example Linker Script for linking NS CR16 elf32 files.
  22    Copyright (C) 2014-2021 Free Software Foundation, Inc.
  23
  24    Copying and distribution of this script, with or without modification,
  25    are permitted in any medium without royalty provided the copyright
  26    notice and this notice are preserved.  */
  27
  28 OUTPUT_FORMAT("${OUTPUT_FORMAT}")
  29 OUTPUT_ARCH(${ARCH})
  30 EOF
  31
  32 test -n "${RELOCATING}" && cat <<EOF
  33 ENTRY(${ENTRY})
  34
  35 /* Define memory regions.  */
  36 MEMORY
  37 {
  38         rom         : ORIGIN = 0x2,         LENGTH = 3M
  39         ram         : ORIGIN = 4M,          LENGTH = 10M
  40 }
  41
  42 EOF
  43
  44 cat <<EOF
  45 /*  Many sections come in three flavours.  There is the 'real' section,
  46     like ".data".  Then there are the per-procedure or per-variable
  47     sections, generated by -ffunction-sections and -fdata-sections in GCC,
  48     and useful for --gc-sections, which for a variable "foo" might be
  49     ".data.foo".  Then there are the linkonce sections, for which the linker
  50     eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  51     The exact correspondences are:
  52
  53     Section     Linkonce section
  54     .text       .gnu.linkonce.t.foo
  55     .rdata      .gnu.linkonce.r.foo
  56     .data       .gnu.linkonce.d.foo
  57     .bss        .gnu.linkonce.b.foo
  58     .debug_info .gnu.linkonce.wi.foo  */
  59
  60 SECTIONS
  61 {
  62   .init :
  63   {
  64     __INIT_START = .;
  65     KEEP (*(SORT_NONE(.init)))
  66     __INIT_END = .;
  67   }${RELOCATING+ > rom}
  68
  69   .fini :
  70   {
  71     __FINI_START = .;
  72     KEEP (*(SORT_NONE(.fini)))
  73     __FINI_END = .;
  74   }${RELOCATING+ > rom}
  75
  76   .jcr :
  77   {
  78     KEEP (*(.jcr))
  79   }${RELOCATING+ > rom}
  80
  81   .text :
  82   {
  83     __TEXT_START = .;
  84     *(.text) *(.text.*) *(.gnu.linkonce.t.*)
  85     __TEXT_END = .;
  86   }${RELOCATING+ > rom}
  87
  88   .rdata :
  89   {
  90     __RDATA_START = .;
  91     *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata*)
  92     __RDATA_END = .;
  93   }${RELOCATING+ > rom}
  94
  95   .ctor ALIGN(4) :
  96   {
  97     __CTOR_START = .;
  98     /* The compiler uses crtbegin.o to find the start
  99        of the constructors, so we make sure it is
 100        first.  Because this is a wildcard, it
 101        doesn't matter if the user does not
 102        actually link against crtbegin.o; the
 103        linker won't look for a file to match a
 104        wildcard.  The wildcard also means that it
 105        doesn't matter which directory crtbegin.o
 106        is in.  */
 107
 108     KEEP (*crtbegin*.o(.ctors))
 109
 110     /* We don't want to include the .ctor section from
 111        the crtend.o file until after the sorted ctors.
 112        The .ctor section from the crtend file contains the
 113        end of ctors marker and it must be last */
 114
 115     KEEP (*(EXCLUDE_FILE (*crtend*.o) .ctors))
 116     KEEP (*(SORT(.ctors.*)))
 117     KEEP (*(.ctors))
 118     __CTOR_END = .;
 119   }${RELOCATING+ > rom}
 120
 121   .dtor ALIGN(4) :
 122   {
 123     __DTOR_START = .;
 124     KEEP (*crtbegin*.o(.dtors))
 125     KEEP (*(EXCLUDE_FILE (*crtend*.o) .dtors))
 126     KEEP (*(SORT(.dtors.*)))
 127     KEEP (*(.dtors))
 128     __DTOR_END = .;
 129   }${RELOCATING+ > rom}
 130
 131   .data :
 132   {
 133     __DATA_START = .;
 134     *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*)
 135     __DATA_END = .;
 136   }${RELOCATING+ > ram AT > rom}
 137
 138   .bss (NOLOAD) :
 139   {
 140     __BSS_START = .;
 141     *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*)
 142     __BSS_END = .;
 143   }${RELOCATING+ > ram}
 144
 145 /* You may change the sizes of the following sections to fit the actual
 146    size your program requires.
 147
 148    The heap and stack are aligned to the bus width, as a speed optimization
 149    for accessing data located there.  */
 150
 151   .heap (NOLOAD) :
 152   {
 153     . = ALIGN(4);
 154     __HEAP_START = .;
 155     . += 0x2000; __HEAP_MAX = .;
 156   }${RELOCATING+ > ram}
 157
 158   .stack (NOLOAD) :
 159   {
 160     . = ALIGN(4);
 161     . += 0x6000;
 162     __STACK_START = .;
 163   }${RELOCATING+ > ram}
 164
 165   .istack (NOLOAD) :
 166   {
 167     . = ALIGN(4);
 168     . += 0x100;
 169     __ISTACK_START = .;
 170   }${RELOCATING+ > ram}
 171
 172   .comment        0 : { *(.comment) }
 173
 174 EOF
 175
 176 . $srcdir/scripttempl/DWARF.sc
 177
 178 cat <<EOF
 179 }
 180
 181 ${RELOCATING+__DATA_IMAGE_START = LOADADDR(.data);}
 182 EOF