ld/scripttempl/elf32crx.sc

   1 # Linker Script for National Semiconductor's CRX-ELF32.
   2 #
   3 # Copyright (C) 2014-2015 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 "$ENTRY" && ENTRY=_start
  15 cat <<EOF
  16
  17 /* Example Linker Script for linking NS CRX elf32 files.
  18
  19    Copyright (C) 2014-2015 Free Software Foundation, Inc.
  20
  21    Copying and distribution of this script, with or without modification,
  22    are permitted in any medium without royalty provided the copyright
  23    notice and this notice are preserved.  */
  24
  25
  26 OUTPUT_FORMAT("${OUTPUT_FORMAT}")
  27 OUTPUT_ARCH(${ARCH})
  28 ${RELOCATING+ENTRY(${ENTRY})}
  29
  30 /* Define memory regions.  */
  31 MEMORY
  32 {
  33         rom         : ORIGIN = 0x2,         LENGTH = 3M
  34         ram         : ORIGIN = 4M,          LENGTH = 10M
  35 }
  36
  37 /*  Many sections come in three flavours.  There is the 'real' section,
  38     like ".data".  Then there are the per-procedure or per-variable
  39     sections, generated by -ffunction-sections and -fdata-sections in GCC,
  40     and useful for --gc-sections, which for a variable "foo" might be
  41     ".data.foo".  Then there are the linkonce sections, for which the linker
  42     eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  43     The exact correspondences are:
  44
  45     Section     Linkonce section
  46     .text       .gnu.linkonce.t.foo
  47     .rdata      .gnu.linkonce.r.foo
  48     .data       .gnu.linkonce.d.foo
  49     .bss        .gnu.linkonce.b.foo
  50     .debug_info .gnu.linkonce.wi.foo  */
  51
  52 SECTIONS
  53 {
  54   .init :
  55   {
  56     __INIT_START = .;
  57     KEEP (*(.init))
  58     __INIT_END = .;
  59   } > rom
  60
  61   .fini :
  62   {
  63     __FINI_START = .;
  64     KEEP (*(.fini))
  65     __FINI_END = .;
  66   } > rom
  67
  68   .jcr :
  69   {
  70     KEEP (*(.jcr))
  71   } > rom
  72
  73   .text :
  74   {
  75     __TEXT_START = .;
  76     *(.text) *(.text.*) *(.gnu.linkonce.t.*)
  77     __TEXT_END = .;
  78   } > rom
  79
  80   .rdata :
  81   {
  82     __RDATA_START = .;
  83     *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata.*)
  84     __RDATA_END = .;
  85   } > rom
  86
  87   .ctor ALIGN(4) :
  88   {
  89     __CTOR_START = .;
  90     /* The compiler uses crtbegin.o to find the start
  91        of the constructors, so we make sure it is
  92        first.  Because this is a wildcard, it
  93        doesn't matter if the user does not
  94        actually link against crtbegin.o; the
  95        linker won't look for a file to match a
  96        wildcard.  The wildcard also means that it
  97        doesn't matter which directory crtbegin.o
  98        is in.  */
  99
 100     KEEP (*crtbegin.o(.ctors))
 101     KEEP (*crtbegin?.o(.ctors))
 102
 103     /* We don't want to include the .ctor section from
 104        the crtend.o file until after the sorted ctors.
 105        The .ctor section from the crtend file contains the
 106        end of ctors marker and it must be last */
 107
 108     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .ctors))
 109     KEEP (*(SORT(.ctors.*)))
 110     KEEP (*(.ctors))
 111     __CTOR_END = .;
 112   } > rom
 113
 114   .dtor ALIGN(4) :
 115   {
 116     __DTOR_START = .;
 117     KEEP (*crtbegin.o(.dtors))
 118     KEEP (*crtbegin?.o(.dtors))
 119     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .dtors))
 120     KEEP (*(SORT(.dtors.*)))
 121     KEEP (*(.dtors))
 122     __DTOR_END = .;
 123   } > rom
 124
 125   .data :
 126   {
 127     __DATA_START = .;
 128     *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*)
 129     __DATA_END = .;
 130   } > ram AT > rom
 131
 132   .bss (NOLOAD) :
 133   {
 134     __BSS_START = .;
 135     *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*)
 136     __BSS_END = .;
 137   } > ram
 138
 139 /* You may change the sizes of the following sections to fit the actual
 140    size your program requires.
 141
 142    The heap and stack are aligned to the bus width, as a speed optimization
 143    for accessing data located there.  */
 144
 145   .heap (NOLOAD) :
 146   {
 147     . = ALIGN(4);
 148     __HEAP_START = .;
 149     . += 0x2000; __HEAP_MAX = .;
 150   } > ram
 151
 152   .stack (NOLOAD) :
 153   {
 154     . = ALIGN(4);
 155     . += 0x6000;
 156     __STACK_START = .;
 157   } > ram
 158
 159   .istack (NOLOAD) :
 160   {
 161     . = ALIGN(4);
 162     . += 0x100;
 163     __ISTACK_START = .;
 164   } > ram
 165
 166   .comment        0 : { *(.comment) }
 167
 168 EOF
 169
 170 . $srcdir/scripttempl/DWARF.sc
 171
 172 cat <<EOF
 173 }
 174
 175 __DATA_IMAGE_START = LOADADDR(.data);
 176 EOF