ld/scripttempl/elf32crx.sc

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