1# Linker Script for National Semiconductor's CR16-ELF32. 2# 3# Copyright (C) 2014-2024 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# Using an empty script for ld -r is better than mashing together 10# sections. This hack likely leaves ld -Ur broken. 11test -n "${RELOCATING}" || exit 0 12 13# The next line should be uncommented if it is desired to link 14# without libstart.o and directly enter main. 15 16# ENTRY=_main 17 18test -z "$ENTRY" && ENTRY=_start 19cat <<EOF 20 21/* Example Linker Script for linking NS CR16 elf32 files. 22 Copyright (C) 2014-2024 Free Software Foundation, Inc. 23 24 Copying and distribution of this script, with or without modification, 25 are permitted in any medium without royalty provided the copyright 26 notice and this notice are preserved. */ 27 28OUTPUT_FORMAT("${OUTPUT_FORMAT}") 29OUTPUT_ARCH(${ARCH}) 30EOF 31 32test -n "${RELOCATING}" && cat <<EOF 33ENTRY(${ENTRY}) 34 35/* Define memory regions. */ 36MEMORY 37{ 38 rom : ORIGIN = 0x2, LENGTH = 3M 39 ram : ORIGIN = 4M, LENGTH = 10M 40} 41 42EOF 43 44cat <<EOF 45/* Many sections come in three flavours. There is the 'real' section, 46 like ".data". Then there are the per-procedure or per-variable 47 sections, generated by -ffunction-sections and -fdata-sections in GCC, 48 and useful for --gc-sections, which for a variable "foo" might be 49 ".data.foo". Then there are the linkonce sections, for which the linker 50 eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 51 The exact correspondences are: 52 53 Section Linkonce section 54 .text .gnu.linkonce.t.foo 55 .rdata .gnu.linkonce.r.foo 56 .data .gnu.linkonce.d.foo 57 .bss .gnu.linkonce.b.foo 58 .debug_info .gnu.linkonce.wi.foo */ 59 60SECTIONS 61{ 62 .init : 63 { 64 __INIT_START = .; 65 KEEP (*(SORT_NONE(.init))) 66 __INIT_END = .; 67 }${RELOCATING+ > rom} 68 69 .fini : 70 { 71 __FINI_START = .; 72 KEEP (*(SORT_NONE(.fini))) 73 __FINI_END = .; 74 }${RELOCATING+ > rom} 75 76 .jcr : 77 { 78 KEEP (*(.jcr)) 79 }${RELOCATING+ > rom} 80 81 .text : 82 { 83 __TEXT_START = .; 84 *(.text) *(.text.*) *(.gnu.linkonce.t.*) 85 __TEXT_END = .; 86 }${RELOCATING+ > rom} 87 88 .rdata : 89 { 90 __RDATA_START = .; 91 *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata*) 92 __RDATA_END = .; 93 }${RELOCATING+ > rom} 94 95 .ctor ALIGN(4) : 96 { 97 __CTOR_START = .; 98 /* The compiler uses crtbegin.o to find the start 99 of the constructors, so we make sure it is 100 first. Because this is a wildcard, it 101 doesn't matter if the user does not 102 actually link against crtbegin.o; the 103 linker won't look for a file to match a 104 wildcard. The wildcard also means that it 105 doesn't matter which directory crtbegin.o 106 is in. */ 107 108 KEEP (*crtbegin*.o(.ctors)) 109 110 /* We don't want to include the .ctor section from 111 the crtend.o file until after the sorted ctors. 112 The .ctor section from the crtend file contains the 113 end of ctors marker and it must be last */ 114 115 KEEP (*(EXCLUDE_FILE (*crtend*.o) .ctors)) 116 KEEP (*(SORT(.ctors.*))) 117 KEEP (*(.ctors)) 118 __CTOR_END = .; 119 }${RELOCATING+ > rom} 120 121 .dtor ALIGN(4) : 122 { 123 __DTOR_START = .; 124 KEEP (*crtbegin*.o(.dtors)) 125 KEEP (*(EXCLUDE_FILE (*crtend*.o) .dtors)) 126 KEEP (*(SORT(.dtors.*))) 127 KEEP (*(.dtors)) 128 __DTOR_END = .; 129 }${RELOCATING+ > rom} 130 131 .data : 132 { 133 __DATA_START = .; 134 *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*) 135 __DATA_END = .; 136 }${RELOCATING+ > ram AT > rom} 137 138 .bss (NOLOAD) : 139 { 140 __BSS_START = .; 141 *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*) 142 __BSS_END = .; 143 }${RELOCATING+ > ram} 144 145/* You may change the sizes of the following sections to fit the actual 146 size your program requires. 147 148 The heap and stack are aligned to the bus width, as a speed optimization 149 for accessing data located there. */ 150 151 .heap (NOLOAD) : 152 { 153 . = ALIGN(4); 154 __HEAP_START = .; 155 . += 0x2000; __HEAP_MAX = .; 156 }${RELOCATING+ > ram} 157 158 .stack (NOLOAD) : 159 { 160 . = ALIGN(4); 161 . += 0x6000; 162 __STACK_START = .; 163 }${RELOCATING+ > ram} 164 165 .istack (NOLOAD) : 166 { 167 . = ALIGN(4); 168 . += 0x100; 169 __ISTACK_START = .; 170 }${RELOCATING+ > ram} 171 172EOF 173 174source_sh $srcdir/scripttempl/misc-sections.sc 175source_sh $srcdir/scripttempl/DWARF.sc 176 177cat <<EOF 178} 179 180${RELOCATING+__DATA_IMAGE_START = LOADADDR(.data);} 181EOF 182