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 8test -z "$ENTRY" && ENTRY=_start 9cat <<EOF 10 11/* Example Linker Script for linking NS CRX elf32 files. */ 12 13OUTPUT_FORMAT("${OUTPUT_FORMAT}") 14OUTPUT_ARCH(${ARCH}) 15${RELOCATING+ENTRY(${ENTRY})} 16 17/* Define memory regions. */ 18MEMORY 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 39SECTIONS 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 /* DWARF 3 */ 170 .debug_pubtypes 0 : { *(.debug_pubtypes) } 171 .debug_ranges 0 : { *(.debug_ranges) } 172 173 /* DWARF Extension. */ 174 .debug_macro 0 : { *(.debug_macro) } 175} 176 177__DATA_IMAGE_START = LOADADDR(.data); 178EOF 179