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 "$ENTRY" && ENTRY=_start
   9 cat <<EOF
  10
  11 /* Example Linker Script for linking NS CRX elf32 files. */
  12
  13 OUTPUT_FORMAT("${OUTPUT_FORMAT}")
  14 OUTPUT_ARCH(${ARCH})
  15 ${RELOCATING+ENTRY(${ENTRY})}
  16
  17 /* Define memory regions.  */
  18 MEMORY
  19 {
  20         rom         : ORIGIN = 0x2,         LENGTH = 3M
  21         ram         : ORIGIN = 4M,          LENGTH = 10M
  22 }
  23
  24 /*  Many sections come in three flavours.  There is the 'real' section,
  25     like ".data".  Then there are the per-procedure or per-variable
  26     sections, generated by -ffunction-sections and -fdata-sections in GCC,
  27     and useful for --gc-sections, which for a variable "foo" might be
  28     ".data.foo".  Then there are the linkonce sections, for which the linker
  29     eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  30     The exact correspondences are:
  31
  32     Section     Linkonce section
  33     .text       .gnu.linkonce.t.foo
  34     .rdata      .gnu.linkonce.r.foo
  35     .data       .gnu.linkonce.d.foo
  36     .bss        .gnu.linkonce.b.foo
  37     .debug_info .gnu.linkonce.wi.foo  */
  38
  39 SECTIONS
  40 {
  41   .init :
  42   {
  43     __INIT_START = .;
  44     KEEP (*(.init))
  45     __INIT_END = .;
  46   } > rom
  47
  48   .fini :
  49   {
  50     __FINI_START = .;
  51     KEEP (*(.fini))
  52     __FINI_END = .;
  53   } > rom
  54
  55   .jcr :
  56   {
  57     KEEP (*(.jcr))
  58   } > rom
  59
  60   .text :
  61   {
  62     __TEXT_START = .;
  63     *(.text) *(.text.*) *(.gnu.linkonce.t.*)
  64     __TEXT_END = .;
  65   } > rom
  66
  67   .rdata :
  68   {
  69     __RDATA_START = .;
  70     *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata.*)
  71     __RDATA_END = .;
  72   } > rom
  73
  74   .ctor ALIGN(4) :
  75   {
  76     __CTOR_START = .;
  77     /* The compiler uses crtbegin.o to find the start
  78        of the constructors, so we make sure it is
  79        first.  Because this is a wildcard, it
  80        doesn't matter if the user does not
  81        actually link against crtbegin.o; the
  82        linker won't look for a file to match a
  83        wildcard.  The wildcard also means that it
  84        doesn't matter which directory crtbegin.o
  85        is in.  */
  86
  87     KEEP (*crtbegin.o(.ctors))
  88     KEEP (*crtbegin?.o(.ctors))
  89
  90     /* We don't want to include the .ctor section from
  91        the crtend.o file until after the sorted ctors.
  92        The .ctor section from the crtend file contains the
  93        end of ctors marker and it must be last */
  94
  95     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .ctors))
  96     KEEP (*(SORT(.ctors.*)))
  97     KEEP (*(.ctors))
  98     __CTOR_END = .;
  99   } > rom
 100
 101   .dtor ALIGN(4) :
 102   {
 103     __DTOR_START = .;
 104     KEEP (*crtbegin.o(.dtors))
 105     KEEP (*crtbegin?.o(.dtors))
 106     KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .dtors))
 107     KEEP (*(SORT(.dtors.*)))
 108     KEEP (*(.dtors))
 109     __DTOR_END = .;
 110   } > rom
 111
 112   .data :
 113   {
 114     __DATA_START = .;
 115     *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*)
 116     __DATA_END = .;
 117   } > ram AT > rom
 118
 119   .bss (NOLOAD) :
 120   {
 121     __BSS_START = .;
 122     *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*)
 123     __BSS_END = .;
 124   } > ram
 125
 126 /* You may change the sizes of the following sections to fit the actual
 127    size your program requires.
 128
 129    The heap and stack are aligned to the bus width, as a speed optimization
 130    for accessing data located there.  */
 131
 132   .heap (NOLOAD) :
 133   {
 134     . = ALIGN(4);
 135     __HEAP_START = .;
 136     . += 0x2000; __HEAP_MAX = .;
 137   } > ram
 138
 139   .stack (NOLOAD) :
 140   {
 141     . = ALIGN(4);
 142     . += 0x6000;
 143     __STACK_START = .;
 144   } > ram
 145
 146   .istack (NOLOAD) :
 147   {
 148     . = ALIGN(4);
 149     . += 0x100;
 150     __ISTACK_START = .;
 151   } > ram
 152
 153   .comment        0 : { *(.comment) }
 154
 155   /* DWARF debug sections.
 156      Symbols in the DWARF debugging sections are relative to the beginning
 157      of the section so we begin them at 0.  */
 158
 159   .debug_aranges  0 : { *(.debug_aranges) }
 160   .debug_pubnames 0 : { *(.debug_pubnames) }
 161   .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
 162   .debug_abbrev   0 : { *(.debug_abbrev) }
 163   .debug_line     0 : { *(.debug_line) }
 164   .debug_frame    0 : { *(.debug_frame) }
 165   .debug_str      0 : { *(.debug_str) }
 166   .debug_loc      0 : { *(.debug_loc) }
 167   .debug_macinfo  0 : { *(.debug_macinfo) }
 168 }
 169
 170 __DATA_IMAGE_START = LOADADDR(.data);
 171 EOF