1 # Copyright (C) 2014 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 - four byte opcode for no-op (defaults to 0) 9 # DATA_ADDR - if end-of-text-plus-one-page isn't right for data start 10 # INITIAL_READONLY_SECTIONS - at start of data segment 11 # OTHER_READONLY_SECTIONS - other than .text .init .rodata ... 12 # (e.g., .PARISC.milli) 13 # OTHER_TEXT_SECTIONS - these get put in .text when relocating 14 # OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... 15 # (e.g., .PARISC.global) 16 # OTHER_SECTIONS - at the end 17 # EXECUTABLE_SYMBOLS - symbols that must be defined for an 18 # executable (e.g., _DYNAMIC_LINK) 19 # TEXT_START_SYMBOLS - symbols that appear at the start of the 20 # .text section. 21 # DATA_START_SYMBOLS - symbols that appear at the start of the 22 # .data section. 23 # OTHER_GOT_SYMBOLS - symbols defined just before .got. 24 # OTHER_GOT_SECTIONS - sections just after .got. 25 # OTHER_SDATA_SECTIONS - sections just after .sdata. 26 # OTHER_BSS_SYMBOLS - symbols that appear at the start of the 27 # .bss section besides __bss_start. 28 # DATA_PLT - .plt should be in data segment, not text segment. 29 # BSS_PLT - .plt should be in bss segment 30 # TEXT_DYNAMIC - .dynamic in text segment, not data segment. 31 # EMBEDDED - whether this is for an embedded system. 32 # SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set 33 # start address of shared library. 34 # INPUT_FILES - INPUT command of files to always include 35 # WRITABLE_RODATA - if set, the .rodata section should be writable 36 # INIT_START, INIT_END - statements just before and just after 37 # combination of .init sections. 38 # FINI_START, FINI_END - statements just before and just after 39 # combination of .fini sections. 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 # 63 # Each of these can also have corresponding .rel.* and .rela.* sections. 64 65 test -z "$ENTRY" && ENTRY=_start 66 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 67 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 68 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 69 test -z "${ELFSIZE}" && ELFSIZE=32 70 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 71 test "$LD_FLAG" = "N" && DATA_ADDR=. 72 INTERP=".interp ${RELOCATING-0} : { *(.interp) }" 73 PLT=".plt ${RELOCATING-0} : { *(.plt) }" 74 DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }" 75 RODATA=".rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} }" 76 SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2) ${RELOCATING+*(.sbss2.*)} ${RELOCATING+*(.gnu.linkonce.sb2.*)} }" 77 SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2) ${RELOCATING+*(.sdata2.*)} ${RELOCATING+*(.gnu.linkonce.s2.*)} }" 78 CTOR=".ctors ${CONSTRUCTING-0} : 79 { 80 ${CONSTRUCTING+${CTOR_START}} 81 /* gcc uses crtbegin.o to find the start of 82 the constructors, so we make sure it is 83 first. Because this is a wildcard, it 84 doesn't matter if the user does not 85 actually link against crtbegin.o; the 86 linker won't look for a file to match a 87 wildcard. The wildcard also means that it 88 doesn't matter which directory crtbegin.o 89 is in. */ 90 91 KEEP (*crtbegin.o(.ctors)) 92 KEEP (*crtbegin?.o(.ctors)) 93 94 /* We don't want to include the .ctor section from 95 the crtend.o file until after the sorted ctors. 96 The .ctor section from the crtend file contains the 97 end of ctors marker and it must be last */ 98 99 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .ctors)) 100 KEEP (*(SORT(.ctors.*))) 101 KEEP (*(.ctors)) 102 ${CONSTRUCTING+${CTOR_END}} 103 }" 104 105 DTOR=" .dtors ${CONSTRUCTING-0} : 106 { 107 ${CONSTRUCTING+${DTOR_START}} 108 KEEP (*crtbegin.o(.dtors)) 109 KEEP (*crtbegin?.o(.dtors)) 110 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .dtors)) 111 KEEP (*(SORT(.dtors.*))) 112 KEEP (*(.dtors)) 113 ${CONSTRUCTING+${DTOR_END}} 114 }" 115 116 # If this is for an embedded system, don't add SIZEOF_HEADERS. 117 if [ -z "$EMBEDDED" ]; then 118 test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR} + SIZEOF_HEADERS" 119 else 120 test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}" 121 fi 122 123 cat <<EOF 124 /* Copyright (C) 2014 Free Software Foundation, Inc. 125 126 Copying and distribution of this script, with or without modification, 127 are permitted in any medium without royalty provided the copyright 128 notice and this notice are preserved. */ 129 130 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 131 "${LITTLE_OUTPUT_FORMAT}") 132 OUTPUT_ARCH(${OUTPUT_ARCH}) 133 ${RELOCATING+ENTRY(${ENTRY})} 134 135 ${RELOCATING+${LIB_SEARCH_DIRS}} 136 ${RELOCATING+/* Do we need any of these for elf? 137 __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */} 138 ${RELOCATING+${EXECUTABLE_SYMBOLS}} 139 ${RELOCATING+${INPUT_FILES}} 140 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables 141 if gld -r is used and the intermediate file has sections starting 142 at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld 143 bug. But for now assigning the zero vmas works. */} 144 145 SECTIONS 146 { 147 ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}} 148 ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0} + SIZEOF_HEADERS;}} 149 ${CREATE_SHLIB-${INTERP}} 150 ${TEXT_DYNAMIC+${DYNAMIC}} 151 152 EOF 153 if [ "x$COMBRELOC" = x ]; then 154 COMBRELOCCAT=cat 155 else 156 COMBRELOCCAT="cat > $COMBRELOC" 157 fi 158 eval $COMBRELOCCAT <<EOF 159 .rel.init ${RELOCATING-0} : { *(.rel.init) } 160 .rela.init ${RELOCATING-0} : { *(.rela.init) } 161 .rel.text ${RELOCATING-0} : 162 { 163 *(.rel.text) 164 ${RELOCATING+*(.rel.text.*)} 165 ${RELOCATING+*(.rel.gnu.linkonce.t.*)} 166 } 167 .rela.text ${RELOCATING-0} : 168 { 169 *(.rela.text) 170 ${RELOCATING+*(.rela.text.*)} 171 ${RELOCATING+*(.rela.gnu.linkonce.t.*)} 172 } 173 .rel.fini ${RELOCATING-0} : { *(.rel.fini) } 174 .rela.fini ${RELOCATING-0} : { *(.rela.fini) } 175 .rel.rodata ${RELOCATING-0} : 176 { 177 *(.rel.rodata) 178 ${RELOCATING+*(.rel.rodata.*)} 179 ${RELOCATING+*(.rel.gnu.linkonce.r.*)} 180 } 181 .rela.rodata ${RELOCATING-0} : 182 { 183 *(.rela.rodata) 184 ${RELOCATING+*(.rela.rodata.*)} 185 ${RELOCATING+*(.rela.gnu.linkonce.r.*)} 186 } 187 ${OTHER_READONLY_RELOC_SECTIONS} 188 .rel.data ${RELOCATING-0} : 189 { 190 *(.rel.data) 191 ${RELOCATING+*(.rel.data.*)} 192 ${RELOCATING+*(.rel.gnu.linkonce.d.*)} 193 } 194 .rela.data ${RELOCATING-0} : 195 { 196 *(.rela.data) 197 ${RELOCATING+*(.rela.data.*)} 198 ${RELOCATING+*(.rela.gnu.linkonce.d.*)} 199 } 200 .rel.ctors ${RELOCATING-0} : { *(.rel.ctors) } 201 .rela.ctors ${RELOCATING-0} : { *(.rela.ctors) } 202 .rel.dtors ${RELOCATING-0} : { *(.rel.dtors) } 203 .rela.dtors ${RELOCATING-0} : { *(.rela.dtors) } 204 .rel.got ${RELOCATING-0} : { *(.rel.got) } 205 .rela.got ${RELOCATING-0} : { *(.rela.got) } 206 ${OTHER_GOT_RELOC_SECTIONS} 207 .rel.sdata ${RELOCATING-0} : 208 { 209 *(.rel.sdata) 210 ${RELOCATING+*(.rel.sdata.*)} 211 ${RELOCATING+*(.rel.gnu.linkonce.s.*)} 212 } 213 .rela.sdata ${RELOCATING-0} : 214 { 215 *(.rela.sdata) 216 ${RELOCATING+*(.rela.sdata.*)} 217 ${RELOCATING+*(.rela.gnu.linkonce.s.*)} 218 } 219 .rel.sbss ${RELOCATING-0} : 220 { 221 *(.rel.sbss) 222 ${RELOCATING+*(.rel.sbss.*)} 223 ${RELOCATING+*(.rel.gnu.linkonce.sb.*)} 224 } 225 .rela.sbss ${RELOCATING-0} : 226 { 227 *(.rela.sbss) 228 ${RELOCATING+*(.rela.sbss.*)} 229 ${RELOCATING+*(.rela.gnu.linkonce.sb.*)} 230 } 231 .rel.sdata2 ${RELOCATING-0} : 232 { 233 *(.rel.sdata2) 234 ${RELOCATING+*(.rel.sdata2.*)} 235 ${RELOCATING+*(.rel.gnu.linkonce.s2.*)} 236 } 237 .rela.sdata2 ${RELOCATING-0} : 238 { 239 *(.rela.sdata2) 240 ${RELOCATING+*(.rela.sdata2.*)} 241 ${RELOCATING+*(.rela.gnu.linkonce.s2.*)} 242 } 243 .rel.sbss2 ${RELOCATING-0} : 244 { 245 *(.rel.sbss2) 246 ${RELOCATING+*(.rel.sbss2.*)} 247 ${RELOCATING+*(.rel.gnu.linkonce.sb2.*)} 248 } 249 .rela.sbss2 ${RELOCATING-0} : 250 { 251 *(.rela.sbss2) 252 ${RELOCATING+*(.rela.sbss2.*)} 253 ${RELOCATING+*(.rela.gnu.linkonce.sb2.*)} 254 } 255 .rel.bss ${RELOCATING-0} : 256 { 257 *(.rel.bss) 258 ${RELOCATING+*(.rel.bss.*)} 259 ${RELOCATING+*(.rel.gnu.linkonce.b.*)} 260 } 261 .rela.bss ${RELOCATING-0} : 262 { 263 *(.rela.bss) 264 ${RELOCATING+*(.rela.bss.*)} 265 ${RELOCATING+*(.rela.gnu.linkonce.b.*)} 266 } 267 EOF 268 if [ -n "$COMBRELOC" ]; then 269 cat <<EOF 270 .rel.dyn : 271 { 272 EOF 273 sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC 274 cat <<EOF 275 } 276 .rela.dyn : 277 { 278 EOF 279 sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC 280 cat <<EOF 281 } 282 EOF 283 fi 284 cat <<EOF 285 .rel.plt ${RELOCATING-0} : { *(.rel.plt) } 286 .rela.plt ${RELOCATING-0} : { *(.rela.plt) } 287 ${OTHER_PLT_RELOC_SECTIONS} 288 289 .init ${RELOCATING-0} : 290 { 291 ${RELOCATING+${INIT_START}} 292 KEEP (*(.init)) 293 ${RELOCATING+${INIT_END}} 294 } =${NOP-0} 295 296 ${DATA_PLT-${BSS_PLT-${PLT}}} 297 .text ${RELOCATING-0} : 298 { 299 ${RELOCATING+${TEXT_START_SYMBOLS}} 300 *(.text) 301 ${RELOCATING+*(.text.*)} 302 *(.stub) 303 /* .gnu.warning sections are handled specially by elf32.em. */ 304 *(.gnu.warning) 305 ${RELOCATING+*(.gnu.linkonce.t.*)} 306 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 307 } =${NOP-0} 308 .fini ${RELOCATING-0} : 309 { 310 ${RELOCATING+${FINI_START}} 311 KEEP (*(.fini)) 312 ${RELOCATING+${FINI_END}} 313 } =${NOP-0} 314 ${RELOCATING+PROVIDE (__etext = .);} 315 ${RELOCATING+PROVIDE (_etext = .);} 316 ${RELOCATING+PROVIDE (etext = .);} 317 318 /* Adjust the address for the data segment. We want to adjust up to 319 the same address within the page on the next page up. */ 320 ${CREATE_SHLIB-${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))};}} 321 ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (. & (${MAXPAGESIZE} - 1))};}} 322 323 .data ${RELOCATING-0} : 324 { 325 ${RELOCATING+${DATA_START_SYMBOLS}} 326 *(.data) 327 ${RELOCATING+*(.data.*)} 328 ${RELOCATING+*(.gnu.linkonce.d.*)} 329 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 330 } 331 .data1 ${RELOCATING-0} : { *(.data1) } 332 .eh_frame ${RELOCATING-0} : 333 { 334 ${RELOCATING+PROVIDE (__eh_frame_begin = .);} 335 *(.eh_frame) 336 LONG (0); 337 ${RELOCATING+PROVIDE (__eh_frame_end = .);} 338 } ${RELOCATING+} 339 .gcc_except_table : { *(.gcc_except_table) } 340 ${INITIAL_READONLY_SECTIONS} 341 .hash ${RELOCATING-0} : { *(.hash) } 342 .dynsym ${RELOCATING-0} : { *(.dynsym) } 343 .dynstr ${RELOCATING-0} : { *(.dynstr) } 344 .gnu.version ${RELOCATING-0} : { *(.gnu.version) } 345 .gnu.version_d ${RELOCATING-0} : { *(.gnu.version_d) } 346 .gnu.version_r ${RELOCATING-0} : { *(.gnu.version_r) } 347 ${RODATA} 348 .rodata1 ${RELOCATING-0} : { *(.rodata1) } 349 ${CREATE_SHLIB-${SDATA2}} 350 ${CREATE_SHLIB-${SBSS2}} 351 ${RELOCATING+${OTHER_READONLY_SECTIONS}} 352 ${RELOCATING+${OTHER_READWRITE_SECTIONS}} 353 ${TEXT_DYNAMIC-${DYNAMIC}} 354 ${RELOCATING+${CTOR}} 355 ${RELOCATING+${DTOR}} 356 .jcr : { KEEP (*(.jcr)) } 357 ${DATA_PLT+${PLT}} 358 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 359 .got ${RELOCATING-0} : { *(.got.plt) *(.got) } 360 ${RELOCATING+${OTHER_GOT_SECTIONS}} 361 ${CREATE_SHLIB+${SDATA2}} 362 ${CREATE_SHLIB+${SBSS2}} 363 /* We want the small data sections together, so single-instruction offsets 364 can access them all, and initialized data all before uninitialized, so 365 we can shorten the on-disk segment size. */ 366 .sdata ${RELOCATING-0} : 367 { 368 ${RELOCATING+${SDATA_START_SYMBOLS}} 369 *(.sdata) 370 ${RELOCATING+*(.sdata.*)} 371 ${RELOCATING+*(.gnu.linkonce.s.*)} 372 } 373 ${RELOCATING+${OTHER_SDATA_SECTIONS}} 374 ${RELOCATING+_edata = .;} 375 ${RELOCATING+PROVIDE (edata = .);} 376 ${RELOCATING+__bss_start = .;} 377 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 378 .sbss ${RELOCATING-0} : 379 { 380 ${RELOCATING+PROVIDE (__sbss_start = .);} 381 ${RELOCATING+PROVIDE (___sbss_start = .);} 382 *(.dynsbss) 383 *(.sbss) 384 ${RELOCATING+*(.sbss.*)} 385 ${RELOCATING+*(.gnu.linkonce.sb.*)} 386 *(.scommon) 387 ${RELOCATING+PROVIDE (__sbss_end = .);} 388 ${RELOCATING+PROVIDE (___sbss_end = .);} 389 } 390 ${BSS_PLT+${PLT}} 391 .bss ${RELOCATING-0} : 392 { 393 *(.dynbss) 394 *(.bss) 395 ${RELOCATING+*(.bss.*)} 396 ${RELOCATING+*(.gnu.linkonce.b.*)} 397 *(COMMON) 398 /* Align here to ensure that the .bss section occupies space up to 399 _end. Align after .bss to ensure correct alignment even if the 400 .bss section disappears because there are no input sections. */ 401 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 402 } 403 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 404 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 405 ${RELOCATING+${OTHER_END_SYMBOLS}} 406 ${RELOCATING+_end = .;} 407 ${RELOCATING+PROVIDE (end = .);} 408 409 /* Stabs debugging sections. */ 410 .stab 0 : { *(.stab) } 411 .stabstr 0 : { *(.stabstr) } 412 .stab.excl 0 : { *(.stab.excl) } 413 .stab.exclstr 0 : { *(.stab.exclstr) } 414 .stab.index 0 : { *(.stab.index) } 415 .stab.indexstr 0 : { *(.stab.indexstr) } 416 417 .comment 0 : { *(.comment) } 418 419 EOF 420 421 . $srcdir/scripttempl/DWARF.sc 422 423 cat <<EOF 424 ${RELOCATING+${OTHER_RELOCATING_SECTIONS}} 425 426 /* These must appear regardless of ${RELOCATING}. */ 427 ${OTHER_SECTIONS} 428 } 429 EOF 430
