ld/scripttempl/elf32cr16.sc

   1 # Linker Script for National Semiconductor's CR16-ELF32.
   2 #
   3 # Copyright (C) 2014-2016 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 # The next line should be uncommented if it is desired to link
  10 # without libstart.o and directly enter main.
  11
  12 # ENTRY=_main
  13
  14 test -z "$ENTRY" && ENTRY=_start
  15 cat <<EOF
  16
  17 /* Example Linker Script for linking NS CR16 elf32 files.
  18    Copyright (C) 2014-2016 Free Software Foundation, Inc.
  19
  20    Copying and distribution of this script, with or without modification,
  21    are permitted in any medium without royalty provided the copyright
  22    notice and this notice are preserved.  */
  23
  24 OUTPUT_FORMAT("${OUTPUT_FORMAT}")
  25 OUTPUT_ARCH(${ARCH})
  26 ${RELOCATING+ENTRY(${ENTRY})}
  27
  28 /* Define memory regions.  */
  29 MEMORY
  30 {
  31         rom         : ORIGIN = 0x2,         LENGTH = 3M
  32         ram         : ORIGIN = 4M,          LENGTH = 10M
  33 }
  34
  35 /*  Many sections come in three flavours.  There is the 'real' section,
  36     like ".data".  Then there are the per-procedure or per-variable
  37     sections, generated by -ffunction-sections and -fdata-sections in GCC,
  38     and useful for --gc-sections, which for a variable "foo" might be
  39     ".data.foo".  Then there are the linkonce sections, for which the linker
  40     eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  41     The exact correspondences are:
  42
  43     Section     Linkonce section
  44     .text       .gnu.linkonce.t.foo
  45     .rdata      .gnu.linkonce.r.foo
  46     .data       .gnu.linkonce.d.foo
  47     .bss        .gnu.linkonce.b.foo
  48     .debug_info .gnu.linkonce.wi.foo  */
  49
  50 SECTIONS
  51 {
  52   .init :
  53   {
  54     __INIT_START = .;
  55     KEEP (*(.init))
  56     __INIT_END = .;
  57   } > rom
  58
  59   .fini :
  60   {
  61     __FINI_START = .;
  62     KEEP (*(.fini))
  63     __FINI_END = .;
  64   } > rom
  65
  66   .jcr :
  67   {
  68     KEEP (*(.jcr))
  69   } > rom
  70
  71   .text :
  72   {
  73     __TEXT_START = .;
  74     *(.text) *(.text.*) *(.gnu.linkonce.t.*)
  75     __TEXT_END = .;
  76   } > rom
  77
  78   .rdata :
  79   {
  80     __RDATA_START = .;
  81     *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata*)
  82     __RDATA_END = .;
  83   } > rom
  84
  85   .ctor ALIGN(4) :
  86   {
  87     __CTOR_START = .;
  88     /* The compiler uses crtbegin.o to find the start
  89        of the constructors, so we make sure it is
  90        first.  Because this is a wildcard, it
  91        doesn't matter if the user does not
  92        actually link against crtbegin.o; the
  93        linker won't look for a file to match a
  94        wildcard.  The wildcard also means that it
  95        doesn't matter which directory crtbegin.o
  96        is in.  */
  97
  98     KEEP (*crtbegin*.o(.ctors))
  99
 100     /* We don't want to include the .ctor section from
 101        the crtend.o file until after the sorted ctors.
 102        The .ctor section from the crtend file contains the
 103        end of ctors marker and it must be last */
 104
 105     KEEP (*(EXCLUDE_FILE (*crtend*.o) .ctors))
 106     KEEP (*(SORT(.ctors.*)))
 107     KEEP (*(.ctors))
 108     __CTOR_END = .;
 109   } > rom
 110
 111   .dtor ALIGN(4) :
 112   {
 113     __DTOR_START = .;
 114     KEEP (*crtbegin*.o(.dtors))
 115     KEEP (*(EXCLUDE_FILE (*crtend*.o) .dtors))
 116     KEEP (*(SORT(.dtors.*)))
 117     KEEP (*(.dtors))
 118     __DTOR_END = .;
 119   } > rom
 120
 121   .data :
 122   {
 123     __DATA_START = .;
 124     *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*)
 125     __DATA_END = .;
 126   } > ram AT > rom
 127
 128   .bss (NOLOAD) :
 129   {
 130     __BSS_START = .;
 131     *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*)
 132     __BSS_END = .;
 133   } > ram
 134
 135 /* You may change the sizes of the following sections to fit the actual
 136    size your program requires.
 137
 138    The heap and stack are aligned to the bus width, as a speed optimization
 139    for accessing data located there.  */
 140
 141   .heap (NOLOAD) :
 142   {
 143     . = ALIGN(4);
 144     __HEAP_START = .;
 145     . += 0x2000; __HEAP_MAX = .;
 146   } > ram
 147
 148   .stack (NOLOAD) :
 149   {
 150     . = ALIGN(4);
 151     . += 0x6000;
 152     __STACK_START = .;
 153   } > ram
 154
 155   .istack (NOLOAD) :
 156   {
 157     . = ALIGN(4);
 158     . += 0x100;
 159     __ISTACK_START = .;
 160   } > ram
 161
 162   .comment        0 : { *(.comment) }
 163
 164 EOF
 165
 166 . $srcdir/scripttempl/DWARF.sc
 167
 168 cat <<EOF
 169 }
 170
 171 __DATA_IMAGE_START = LOADADDR(.data);
 172 EOF