1 # Copyright (C) 2014-2025 Free Software Foundation, Inc. 2 # 3 # Copying and distribution of this file, with or without modification, 4 # are permitted in any medium without royalty provided the copyright 5 # notice and this notice are preserved. 6 # 7 # Unusual variables checked by this code: 8 # NOP - two byte opcode for no-op (defaults to 0) 9 # INITIAL_READONLY_SECTIONS - at start of text segment 10 # OTHER_READONLY_SECTIONS - other than .text .init .rodata ... 11 # (e.g., .PARISC.milli) 12 # OTHER_TEXT_SECTIONS - these get put in .text when relocating 13 # OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... 14 # (e.g., .PARISC.global) 15 # OTHER_SECTIONS - at the end 16 # EXECUTABLE_SYMBOLS - symbols that must be defined for an 17 # executable (e.g., _DYNAMIC_LINK) 18 # TEXT_START_SYMBOLS - symbols that appear at the start of the 19 # .text section. 20 # DATA_START_SYMBOLS - symbols that appear at the start of the 21 # .data section. 22 # OTHER_GOT_SYMBOLS - symbols defined just before .got. 23 # OTHER_GOT_SECTIONS - sections just after .got and .sdata. 24 # OTHER_BSS_SYMBOLS - symbols that appear at the start of the 25 # .bss section besides __bss_start. 26 # INPUT_FILES - INPUT command of files to always include 27 # INIT_START, INIT_END - statements just before and just after 28 # combination of .init sections. 29 # FINI_START, FINI_END - statements just before and just after 30 # combination of .fini sections. 31 # 32 # When adding sections, do note that the names of some sections are used 33 # when specifying the start address of the next. 34 # 35 36 # Many sections come in three flavours. There is the 'real' section, 37 # like ".data". Then there are the per-procedure or per-variable 38 # sections, generated by -ffunction-sections and -fdata-sections in GCC, 39 # and useful for --gc-sections, which for a variable "foo" might be 40 # ".data.foo". Then there are the linkonce sections, for which the linker 41 # eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 42 # The exact correspondences are: 43 # 44 # Section Linkonce section 45 # .text .gnu.linkonce.t.foo 46 # .rodata .gnu.linkonce.r.foo 47 # .data .gnu.linkonce.d.foo 48 # .bss .gnu.linkonce.b.foo 49 # .sdata .gnu.linkonce.s.foo 50 # .sbss .gnu.linkonce.sb.foo 51 # .sdata2 .gnu.linkonce.s2.foo 52 # .sbss2 .gnu.linkonce.sb2.foo 53 # 54 # Each of these can also have corresponding .rel.* and .rela.* sections. 55 56 test -z "$ENTRY" && ENTRY=_start 57 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 58 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 59 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 60 test -z "${ELFSIZE}" && ELFSIZE=32 61 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 62 CTOR=".ctors ${CONSTRUCTING-0} : 63 { 64 ${CONSTRUCTING+${CTOR_START}} 65 /* gcc uses crtbegin.o to find the start of 66 the constructors, so we make sure it is 67 first. Because this is a wildcard, it 68 doesn't matter if the user does not 69 actually link against crtbegin.o; the 70 linker won't look for a file to match a 71 wildcard. The wildcard also means that it 72 doesn't matter which directory crtbegin.o 73 is in. */ 74 75 KEEP (*crtbegin.o(.ctors)) 76 KEEP (*crtbegin?.o(.ctors)) 77 78 /* We don't want to include the .ctor section from 79 the crtend.o file until after the sorted ctors. 80 The .ctor section from the crtend file contains the 81 end of ctors marker and it must be last */ 82 83 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .ctors)) 84 KEEP (*(SORT(.ctors.*))) 85 KEEP (*(.ctors)) 86 ${CONSTRUCTING+${CTOR_END}} 87 } > ROM" 88 89 DTOR=" .dtors ${CONSTRUCTING-0} : 90 { 91 ${CONSTRUCTING+${DTOR_START}} 92 KEEP (*crtbegin.o(.dtors)) 93 KEEP (*crtbegin?.o(.dtors)) 94 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .dtors)) 95 KEEP (*(SORT(.dtors.*))) 96 KEEP (*(.dtors)) 97 ${CONSTRUCTING+${DTOR_END}} 98 } > ROM" 99 100 cat <<EOF 101 /* Copyright (C) 2014-2025 Free Software Foundation, Inc. 102 103 Copying and distribution of this script, with or without modification, 104 are permitted in any medium without royalty provided the copyright 105 notice and this notice are preserved. */ 106 107 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 108 "${LITTLE_OUTPUT_FORMAT}") 109 OUTPUT_ARCH(${OUTPUT_ARCH}) 110 EOF 111 112 test -n "${RELOCATING}" && cat <<EOF 113 ENTRY(${ENTRY}) 114 115 ${LIB_SEARCH_DIRS} 116 ${EXECUTABLE_SYMBOLS} 117 ${INPUT_FILES} 118 119 /* There are two memory regions we care about, one from 0 through 0x7F00 120 that is RAM and one from 0x8000 up which is ROM. */ 121 MEMORY 122 { 123 RAM (w) : ORIGIN = 0, LENGTH = 0x7F00 124 ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000 125 } 126 EOF 127 128 cat <<EOF 129 SECTIONS 130 { 131 .data ${RELOCATING-0} : 132 { 133 ${RELOCATING+__rdata = .;} 134 ${RELOCATING+__data = .;} 135 ${RELOCATING+${DATA_START_SYMBOLS}} 136 *(.data) 137 ${RELOCATING+*(.data.*)} 138 ${RELOCATING+*(.gnu.linkonce.d.*)} 139 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 140 }${RELOCATING+ > RAM} 141 ${RELOCATING+${OTHER_READWRITE_SECTIONS}} 142 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 143 ${RELOCATING+${OTHER_GOT_SECTIONS}} 144 ${RELOCATING+_edata = .;} 145 ${RELOCATING+PROVIDE (edata = .);} 146 ${RELOCATING+. = ALIGN(ALIGNOF(NEXT_SECTION));} 147 ${RELOCATING+__bss_start = .;} 148 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 149 .bss ${RELOCATING-0} : 150 { 151 ${RELOCATING+*(.dynbss)} 152 *(.bss) 153 ${RELOCATING+*(.bss.*)} 154 ${RELOCATING+*(.gnu.linkonce.b.*)} 155 ${RELOCATING+*(COMMON) 156 /* Align here to ensure that the .bss section occupies space up to 157 _end. Align after .bss to ensure correct alignment even if the 158 .bss section disappears because there are no input sections. */ 159 . = ALIGN(${ALIGNMENT});} 160 }${RELOCATING+ > RAM} 161 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 162 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 163 ${RELOCATING+${OTHER_END_SYMBOLS}} 164 ${RELOCATING+_end = .;} 165 ${RELOCATING+__stack = .;} 166 ${RELOCATING+PROVIDE (end = .);} 167 168 /* Read-only sections in ROM. */ 169 .int_vec ${RELOCATING-0} : { *(.int_vec) }${RELOCATING+ > ROM} 170 171 .rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} }${RELOCATING+ > ROM} 172 ${RELOCATING+${CTOR}} 173 ${RELOCATING+${DTOR}} 174 .jcr : { KEEP (*(.jcr)) }${RELOCATING+ > ROM} 175 .eh_frame : { KEEP (*(.eh_frame)) }${RELOCATING+ > ROM} 176 .gcc_except_table : { *(.gcc_except_table)${RELOCATING+ *(.gcc_except_table.*)} }${RELOCATING+ > ROM} 177 .plt : { *(.plt) }${RELOCATING+ > ROM} 178 179 .text ${RELOCATING-0} : 180 { 181 ${RELOCATING+${TEXT_START_SYMBOLS}} 182 *(.text) 183 ${RELOCATING+*(.text.*)} 184 *(.stub) 185 /* .gnu.warning sections are handled specially by elf.em. */ 186 *(.gnu.warning) 187 ${RELOCATING+*(.gnu.linkonce.t.*)} 188 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 189 }${RELOCATING+ > ROM =${NOP-0}} 190 .init ${RELOCATING-0} : 191 { 192 ${RELOCATING+${INIT_START}} 193 KEEP (*(SORT_NONE(.init))) 194 ${RELOCATING+${INIT_END}} 195 }${RELOCATING+ > ROM =${NOP-0}} 196 .fini ${RELOCATING-0} : 197 { 198 ${RELOCATING+${FINI_START}} 199 KEEP (*(SORT_NONE(.fini))) 200 ${RELOCATING+${FINI_END}} 201 }${RELOCATING+ > ROM =${NOP-0}} 202 ${RELOCATING+PROVIDE (__etext = .);} 203 ${RELOCATING+PROVIDE (_etext = .);} 204 ${RELOCATING+PROVIDE (etext = .);} 205 ${RELOCATING+${OTHER_READONLY_SECTIONS}} 206 207 EOF 208 209 source_sh $srcdir/scripttempl/misc-sections.sc 210 source_sh $srcdir/scripttempl/DWARF.sc 211 212 cat <<EOF 213 ${RELOCATING+${OTHER_RELOCATING_SECTIONS}} 214 215 /* These must appear regardless of ${RELOCATING}. */ 216 ${OTHER_SECTIONS} 217 } 218 EOF 219
Indexes created Wed Sep 23 00:26:21 UTC 2026