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      1 # Linker Script for National Semiconductor's CRX-ELF32.
      2 #
      3 # Copyright (C) 2014 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 "$ENTRY" && ENTRY=_start
     15 cat <<EOF
     16 
     17 /* Example Linker Script for linking NS CRX elf32 files.
     18 
     19    Copyright (C) 2014 Free Software Foundation, Inc.
     20 
     21    Copying and distribution of this script, with or without modification,
     22    are permitted in any medium without royalty provided the copyright
     23    notice and this notice are preserved.  */
     24 
     25 
     26 OUTPUT_FORMAT("${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
    177