ld/scripttempl/elf32crx.sc

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