1# 2# Unusual variables checked by this code: 3# NOP - four byte opcode for no-op (defaults to 0) 4# NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not 5# empty. 6# DATA_ADDR - if end-of-text-plus-one-page isn't right for data start 7# INITIAL_READONLY_SECTIONS - at start of text segment 8# OTHER_READONLY_SECTIONS - other than .text .init .rodata ... 9# (e.g., .PARISC.milli) 10# OTHER_TEXT_SECTIONS - these get put in .text when relocating 11# OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... 12# (e.g., .PARISC.global) 13# OTHER_BSS_SECTIONS - other than .bss .sbss ... 14# OTHER_SECTIONS - at the end 15# EXECUTABLE_SYMBOLS - symbols that must be defined for an 16# executable (e.g., _DYNAMIC_LINK) 17# TEXT_START_SYMBOLS - symbols that appear at the start of the 18# .text section. 19# DATA_START_SYMBOLS - symbols that appear at the start of the 20# .data section. 21# OTHER_GOT_SYMBOLS - symbols defined just before .got. 22# OTHER_GOT_SECTIONS - sections just after .got. 23# OTHER_SDATA_SECTIONS - sections just after .sdata. 24# OTHER_BSS_SYMBOLS - symbols that appear at the start of the 25# .bss section besides __bss_start. 26# DATA_PLT - .plt should be in data segment, not text segment. 27# BSS_PLT - .plt should be in bss segment 28# TEXT_DYNAMIC - .dynamic in text segment, not data segment. 29# EMBEDDED - whether this is for an embedded system. 30# SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set 31# start address of shared library. 32# INPUT_FILES - INPUT command of files to always include 33# WRITABLE_RODATA - if set, the .rodata section should be writable 34# INIT_START, INIT_END - statements just before and just after 35# combination of .init sections. 36# FINI_START, FINI_END - statements just before and just after 37# combination of .fini sections. 38# STACK_ADDR - start of a .stack section. 39# OTHER_END_SYMBOLS - symbols to place right at the end of the script. 40# 41# When adding sections, do note that the names of some sections are used 42# when specifying the start address of the next. 43# 44 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# .rodata .gnu.linkonce.r.foo 56# .data .gnu.linkonce.d.foo 57# .bss .gnu.linkonce.b.foo 58# .sdata .gnu.linkonce.s.foo 59# .sbss .gnu.linkonce.sb.foo 60# .sdata2 .gnu.linkonce.s2.foo 61# .sbss2 .gnu.linkonce.sb2.foo 62# .debug_info .gnu.linkonce.wi.foo 63# 64# Each of these can also have corresponding .rel.* and .rela.* sections. 65 66test -z "$ENTRY" && ENTRY=_start 67test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 68test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 69if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 70test -z "${ELFSIZE}" && ELFSIZE=32 71test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 72test "$LD_FLAG" = "N" && DATA_ADDR=. 73INTERP=".interp ${RELOCATING-0} : { *(.interp) }" 74PLT=".plt ${RELOCATING-0} : { *(.plt) }" 75DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }" 76RODATA=".rodata ${RELOCATING-0} : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }" 77if test -z "${NO_SMALL_DATA}"; then 78 SBSS=".sbss ${RELOCATING-0} : 79 { 80 ${RELOCATING+PROVIDE (__sbss_start = .);} 81 ${RELOCATING+PROVIDE (___sbss_start = .);} 82 *(.dynsbss) 83 *(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*}) 84 *(.scommon) 85 ${RELOCATING+PROVIDE (__sbss_end = .);} 86 ${RELOCATING+PROVIDE (___sbss_end = .);} 87 }" 88 SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) }" 89 SDATA="/* We want the small data sections together, so single-instruction offsets 90 can access them all, and initialized data all before uninitialized, so 91 we can shorten the on-disk segment size. */ 92 .sdata ${RELOCATING-0} : 93 { 94 ${RELOCATING+${SDATA_START_SYMBOLS}} 95 *(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*}) 96 }" 97 SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) }" 98 REL_SDATA=".rel.sdata ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) } 99 .rela.sdata ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }" 100 REL_SBSS=".rel.sbss ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) } 101 .rela.sbss ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }" 102 REL_SDATA2=".rel.sdata2 ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) } 103 .rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }" 104 REL_SBSS2=".rel.sbss2 ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) } 105 .rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }" 106fi 107CTOR=" 108 ${CONSTRUCTING+${CTOR_START}} 109 /* gcc uses crtbegin.o to find the start of 110 the constructors, so we make sure it is 111 first. Because this is a wildcard, it 112 doesn't matter if the user does not 113 actually link against crtbegin.o; the 114 linker won't look for a file to match a 115 wildcard. The wildcard also means that it 116 doesn't matter which directory crtbegin.o 117 is in. */ 118 119 KEEP (*crtbegin*.o(.ctors)) 120 121 /* We don't want to include the .ctor section from 122 from the crtend.o file until after the sorted ctors. 123 The .ctor section from the crtend file contains the 124 end of ctors marker and it must be last */ 125 126 KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors)) 127 KEEP (*(SORT(.ctors.*))) 128 KEEP (*(.ctors)) 129 ${CONSTRUCTING+${CTOR_END}} 130" 131DTOR=" 132 ${CONSTRUCTING+${DTOR_START}} 133 KEEP (*crtbegin*.o(.dtors)) 134 KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors)) 135 KEEP (*(SORT(.dtors.*))) 136 KEEP (*(.dtors)) 137 ${CONSTRUCTING+${DTOR_END}} 138" 139STACK=" .stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} : 140 { 141 ${RELOCATING+_stack = .;} 142 *(.stack) 143 }" 144 145test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}" 146 147cat <<EOF 148OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 149 "${LITTLE_OUTPUT_FORMAT}") 150OUTPUT_ARCH(${OUTPUT_ARCH}) 151ENTRY(${ENTRY}) 152 153${RELOCATING+${LIB_SEARCH_DIRS}} 154${RELOCATING+/* Do we need any of these for elf? 155 __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */} 156${RELOCATING+${EXECUTABLE_SYMBOLS}} 157${RELOCATING+${INPUT_FILES}} 158${RELOCATING- /* For some reason, the Solaris linker makes bad executables 159 if gld -r is used and the intermediate file has sections starting 160 at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld 161 bug. But for now assigning the zero vmas works. */} 162 163SECTIONS 164{ 165 /* Read-only sections, merged into text segment: */ 166 ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}} 167 ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}} 168 ${CREATE_SHLIB-${INTERP}} 169 ${INITIAL_READONLY_SECTIONS} 170 ${TEXT_DYNAMIC+${DYNAMIC}} 171 .hash ${RELOCATING-0} : { *(.hash) } 172 .dynsym ${RELOCATING-0} : { *(.dynsym) } 173 .dynstr ${RELOCATING-0} : { *(.dynstr) } 174 .gnu.version ${RELOCATING-0} : { *(.gnu.version) } 175 .gnu.version_d ${RELOCATING-0}: { *(.gnu.version_d) } 176 .gnu.version_r ${RELOCATING-0}: { *(.gnu.version_r) } 177 178EOF 179if [ "x$COMBRELOC" = x ]; then 180 COMBRELOCCAT=cat 181else 182 COMBRELOCCAT="cat > $COMBRELOC" 183fi 184eval $COMBRELOCCAT <<EOF 185 .rel.init ${RELOCATING-0} : { *(.rel.init) } 186 .rela.init ${RELOCATING-0} : { *(.rela.init) } 187 .rel.text ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) } 188 .rela.text ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) } 189 .rel.fini ${RELOCATING-0} : { *(.rel.fini) } 190 .rela.fini ${RELOCATING-0} : { *(.rela.fini) } 191 .rel.rodata ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) } 192 .rela.rodata ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) } 193 ${OTHER_READONLY_RELOC_SECTIONS} 194 .rel.data ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) } 195 .rela.data ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) } 196 .rel.ctors ${RELOCATING-0} : { *(.rel.ctors) } 197 .rela.ctors ${RELOCATING-0} : { *(.rela.ctors) } 198 .rel.dtors ${RELOCATING-0} : { *(.rel.dtors) } 199 .rela.dtors ${RELOCATING-0} : { *(.rela.dtors) } 200 .rel.got ${RELOCATING-0} : { *(.rel.got) } 201 .rela.got ${RELOCATING-0} : { *(.rela.got) } 202 ${OTHER_GOT_RELOC_SECTIONS} 203 ${REL_SDATA} 204 ${REL_SBSS} 205 ${REL_SDATA2} 206 ${REL_SBSS2} 207 .rel.bss ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) } 208 .rela.bss ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) } 209EOF 210if [ -n "$COMBRELOC" ]; then 211cat <<EOF 212 .rel.dyn ${RELOCATING-0} : 213 { 214EOF 215sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC 216cat <<EOF 217 } 218 .rela.dyn ${RELOCATING-0} : 219 { 220EOF 221sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC 222cat <<EOF 223 } 224EOF 225fi 226cat <<EOF 227 . = ALIGN(0x1000); 228 .rel.plt ${RELOCATING-0} : { *(.rel.plt) } 229 .rela.plt ${RELOCATING-0} : { *(.rela.plt) } 230 ${OTHER_PLT_RELOC_SECTIONS} 231 ${DATA_PLT-${BSS_PLT-${PLT}}} 232 .text ${RELOCATING-0} : 233 { 234 ${RELOCATING+${TEXT_START_SYMBOLS}} 235 *(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*}) 236 /* .gnu.warning sections are handled specially by elf32.em. */ 237 *(.gnu.warning) 238 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 239 } =${NOP-0} 240 .fini ${RELOCATING-0} : 241 { 242 ${RELOCATING+${FINI_START}} 243 KEEP (*(.fini)) 244 ${RELOCATING+${FINI_END}} 245 } =${NOP-0} 246 ${RELOCATING+PROVIDE (__etext = .);} 247 ${RELOCATING+PROVIDE (_etext = .);} 248 ${RELOCATING+PROVIDE (etext = .);} 249 . = ALIGN(0x1000); 250 ${CREATE_SHLIB-${SDATA2}} 251 ${CREATE_SHLIB-${SBSS2}} 252 ${OTHER_READONLY_SECTIONS} 253 .eh_frame_hdr : { *(.eh_frame_hdr) } 254 255 . = ALIGN(0x1000); 256 .data ${RELOCATING-0} : 257 { 258 *(.rodata .rodata.*) 259 *(.rodata1) 260 *(.gnu.linkonce.r.*) 261 ${RELOCATING+${DATA_START_SYMBOLS}} 262 *(.data${RELOCATING+ .data.* .gnu.linkonce.d.*}) 263 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 264 KEEP (*(.eh_frame)) 265 *(.gcc_except_table) 266 ${CTOR} 267 ${DTOR} 268 KEEP (*(.jcr)) 269 } 270 .data1 ${RELOCATING-0} : { *(.data1) } 271 . = ALIGN(0x1000); 272 .gcc_except_table ${RELOCATING-0} : { *(.gcc_except_table) } 273 ${WRITABLE_RODATA+${RODATA}} 274 ${OTHER_READWRITE_SECTIONS} 275 ${TEXT_DYNAMIC-${DYNAMIC}} 276 ${DATA_PLT+${PLT}} 277 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 278 .got ${RELOCATING-0} : { *(.got.plt) *(.got) } 279 ${OTHER_GOT_SECTIONS} 280 ${CREATE_SHLIB+${SDATA2}} 281 ${CREATE_SHLIB+${SBSS2}} 282 ${SDATA} 283 ${OTHER_SDATA_SECTIONS} 284 ${RELOCATING+_edata = .;} 285 ${RELOCATING+PROVIDE (edata = .);} 286 ${RELOCATING+__bss_start = .;} 287 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 288 ${SBSS} 289 ${BSS_PLT+${PLT}} 290 . = ALIGN(0x1000); 291 .bss ${RELOCATING-0} : 292 { 293 *(.dynbss) 294 *(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*}) 295 *(COMMON) 296 /* Align here to ensure that the .bss section occupies space up to 297 _end. Align after .bss to ensure correct alignment even if the 298 .bss section disappears because there are no input sections. */ 299 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 300 } 301 ${OTHER_BSS_SECTIONS} 302 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 303 ${RELOCATING+_end = .;} 304 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 305 ${RELOCATING+PROVIDE (end = .);} 306 307 /* Stabs debugging sections. */ 308 . = ALIGN(0x1000); 309 .stab 0 : { *(.stab) } 310 .stabstr 0 : { *(.stabstr) } 311 .stab.excl 0 : { *(.stab.excl) } 312 .stab.exclstr 0 : { *(.stab.exclstr) } 313 .stab.index 0 : { *(.stab.index) } 314 .stab.indexstr 0 : { *(.stab.indexstr) } 315 316 . = ALIGN(0x1000); 317 .comment 0 : { *(.comment) } 318 319 /* DWARF debug sections. 320 Symbols in the DWARF debugging sections are relative to the beginning 321 of the section so we begin them at 0. */ 322 323 /* DWARF 1 */ 324 .debug 0 : { *(.debug) } 325 .line 0 : { *(.line) } 326 327 /* GNU DWARF 1 extensions */ 328 .debug_srcinfo 0 : { *(.debug_srcinfo) } 329 .debug_sfnames 0 : { *(.debug_sfnames) } 330 331 /* DWARF 1.1 and DWARF 2 */ 332 .debug_aranges 0 : { *(.debug_aranges) } 333 .debug_pubnames 0 : { *(.debug_pubnames) } 334 335 /* DWARF 2 */ 336 .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } 337 .debug_abbrev 0 : { *(.debug_abbrev) } 338 .debug_line 0 : { *(.debug_line) } 339 .debug_frame 0 : { *(.debug_frame) } 340 .debug_str 0 : { *(.debug_str) } 341 .debug_loc 0 : { *(.debug_loc) } 342 .debug_macinfo 0 : { *(.debug_macinfo) } 343 344 /* SGI/MIPS DWARF 2 extensions */ 345 .debug_weaknames 0 : { *(.debug_weaknames) } 346 .debug_funcnames 0 : { *(.debug_funcnames) } 347 .debug_typenames 0 : { *(.debug_typenames) } 348 .debug_varnames 0 : { *(.debug_varnames) } 349 350 ${STACK_ADDR+${STACK}} 351 ${OTHER_SECTIONS} 352 ${RELOCATING+${OTHER_END_SYMBOLS}} 353} 354EOF 355