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_SECTIONS - at the end 14# EXECUTABLE_SYMBOLS - symbols that must be defined for an 15# executable (e.g., _DYNAMIC_LINK) 16# TEXT_START_SYMBOLS - symbols that appear at the start of the 17# .text section. 18# DATA_START_SYMBOLS - symbols that appear at the start of the 19# .data section. 20# OTHER_GOT_SYMBOLS - symbols defined just before .got. 21# OTHER_GOT_SECTIONS - sections just after .got. 22# OTHER_SDATA_SECTIONS - sections just after .sdata. 23# OTHER_BSS_SYMBOLS - symbols that appear at the start of the 24# .bss section besides __bss_start. 25# DATA_PLT - .plt should be in data segment, not text segment. 26# BSS_PLT - .plt should be in bss segment 27# TEXT_DYNAMIC - .dynamic in text segment, not data segment. 28# EMBEDDED - whether this is for an embedded system. 29# SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set 30# start address of shared library. 31# INPUT_FILES - INPUT command of files to always include 32# WRITABLE_RODATA - if set, the .rodata section should be writable 33# INIT_START, INIT_END - statements just before and just after 34# combination of .init sections. 35# FINI_START, FINI_END - statements just before and just after 36# combination of .fini sections. 37# STACK_ADDR - start of a .stack section. 38# OTHER_SYMBOLS - symbols to place right at the end of the script. 39# 40# When adding sections, do note that the names of some sections are used 41# when specifying the start address of the next. 42# 43 44# Many sections come in three flavours. There is the 'real' section, 45# like ".data". Then there are the per-procedure or per-variable 46# sections, generated by -ffunction-sections and -fdata-sections in GCC, 47# and useful for --gc-sections, which for a variable "foo" might be 48# ".data.foo". Then there are the linkonce sections, for which the linker 49# eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 50# The exact correspondences are: 51# 52# Section Linkonce section 53# .text .gnu.linkonce.t.foo 54# .rodata .gnu.linkonce.r.foo 55# .data .gnu.linkonce.d.foo 56# .bss .gnu.linkonce.b.foo 57# .sdata .gnu.linkonce.s.foo 58# .sbss .gnu.linkonce.sb.foo 59# .sdata2 .gnu.linkonce.s2.foo 60# .sbss2 .gnu.linkonce.sb2.foo 61# .debug_info .gnu.linkonce.wi.foo 62# 63# Each of these can also have corresponding .rel.* and .rela.* sections. 64 65test -z "$ENTRY" && ENTRY=_start 66test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 67test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 68if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 69test -z "${ELFSIZE}" && ELFSIZE=32 70test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 71test "$LD_FLAG" = "N" && DATA_ADDR=. 72INTERP=".interp ${RELOCATING-0} : { *(.interp) }" 73PLT=".plt ${RELOCATING-0} : { *(.plt) }" 74DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }" 75RODATA=".rodata ${RELOCATING-0} : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }" 76if test -z "${NO_SMALL_DATA}"; then 77 SBSS=".sbss ${RELOCATING-0} : 78 { 79 ${RELOCATING+PROVIDE (__sbss_start = .);} 80 ${RELOCATING+PROVIDE (___sbss_start = .);} 81 *(.dynsbss) 82 *(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*}) 83 *(.scommon) 84 ${RELOCATING+PROVIDE (__sbss_end = .);} 85 ${RELOCATING+PROVIDE (___sbss_end = .);} 86 }" 87 SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) }" 88 SDATA="/* We want the small data sections together, so single-instruction offsets 89 can access them all, and initialized data all before uninitialized, so 90 we can shorten the on-disk segment size. */ 91 .sdata ${RELOCATING-0} : 92 { 93 ${RELOCATING+${SDATA_START_SYMBOLS}} 94 *(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*}) 95 }" 96 SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) }" 97 REL_SDATA=".rel.sdata ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) } 98 .rela.sdata ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }" 99 REL_SBSS=".rel.sbss ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) } 100 .rela.sbss ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }" 101 REL_SDATA2=".rel.sdata2 ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) } 102 .rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }" 103 REL_SBSS2=".rel.sbss2 ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) } 104 .rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }" 105fi 106CTOR=" 107 ${CONSTRUCTING+${CTOR_START}} 108 /* gcc uses crtbegin.o to find the start of 109 the constructors, so we make sure it is 110 first. Because this is a wildcard, it 111 doesn't matter if the user does not 112 actually link against crtbegin.o; the 113 linker won't look for a file to match a 114 wildcard. The wildcard also means that it 115 doesn't matter which directory crtbegin.o 116 is in. */ 117 118 KEEP (*crtbegin*.o(.ctors)) 119 120 /* We don't want to include the .ctor section from 121 the crtend.o file until after the sorted ctors. 122 The .ctor section from the crtend file contains the 123 end of ctors marker and it must be last */ 124 125 KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors)) 126 KEEP (*(SORT(.ctors.*))) 127 KEEP (*(.ctors)) 128 ${CONSTRUCTING+${CTOR_END}} 129" 130DTOR=" 131 ${CONSTRUCTING+${DTOR_START}} 132 KEEP (*crtbegin*.o(.dtors)) 133 KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors)) 134 KEEP (*(SORT(.dtors.*))) 135 KEEP (*(.dtors)) 136 ${CONSTRUCTING+${DTOR_END}} 137" 138STACK=" .stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} : 139 { 140 ${RELOCATING+_stack = .;} 141 *(.stack) 142 }" 143 144test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}" 145 146cat <<EOF 147OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 148 "${LITTLE_OUTPUT_FORMAT}") 149OUTPUT_ARCH(${OUTPUT_ARCH}) 150ENTRY(${ENTRY}) 151 152${RELOCATING+${LIB_SEARCH_DIRS}} 153${RELOCATING+/* Do we need any of these for elf? 154 __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */} 155${RELOCATING+${EXECUTABLE_SYMBOLS}} 156${RELOCATING+${INPUT_FILES}} 157${RELOCATING- /* For some reason, the Solaris linker makes bad executables 158 if gld -r is used and the intermediate file has sections starting 159 at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld 160 bug. But for now assigning the zero vmas works. */} 161 162SECTIONS 163{ 164 /* Read-only sections, merged into text segment: */ 165 ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}} 166 ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}} 167 ${CREATE_SHLIB-${INTERP}} 168 ${INITIAL_READONLY_SECTIONS} 169 ${TEXT_DYNAMIC+${DYNAMIC}} 170 .hash ${RELOCATING-0} : { *(.hash) } 171 .dynsym ${RELOCATING-0} : { *(.dynsym) } 172 .dynstr ${RELOCATING-0} : { *(.dynstr) } 173 .gnu.version ${RELOCATING-0} : { *(.gnu.version) } 174 .gnu.version_d ${RELOCATING-0}: { *(.gnu.version_d) } 175 .gnu.version_r ${RELOCATING-0}: { *(.gnu.version_r) } 176 177EOF 178if [ "x$COMBRELOC" = x ]; then 179 COMBRELOCCAT=cat 180else 181 COMBRELOCCAT="cat > $COMBRELOC" 182fi 183eval $COMBRELOCCAT <<EOF 184 .rel.init ${RELOCATING-0} : { *(.rel.init) } 185 .rela.init ${RELOCATING-0} : { *(.rela.init) } 186 .rel.text ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) } 187 .rela.text ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) } 188 .rel.fini ${RELOCATING-0} : { *(.rel.fini) } 189 .rela.fini ${RELOCATING-0} : { *(.rela.fini) } 190 .rel.rodata ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) } 191 .rela.rodata ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) } 192 ${OTHER_READONLY_RELOC_SECTIONS} 193 .rel.data ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) } 194 .rela.data ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) } 195 .rel.ctors ${RELOCATING-0} : { *(.rel.ctors) } 196 .rela.ctors ${RELOCATING-0} : { *(.rela.ctors) } 197 .rel.dtors ${RELOCATING-0} : { *(.rel.dtors) } 198 .rela.dtors ${RELOCATING-0} : { *(.rela.dtors) } 199 .rel.got ${RELOCATING-0} : { *(.rel.got) } 200 .rela.got ${RELOCATING-0} : { *(.rela.got) } 201 ${OTHER_GOT_RELOC_SECTIONS} 202 ${REL_SDATA} 203 ${REL_SBSS} 204 ${REL_SDATA2} 205 ${REL_SBSS2} 206 .rel.bss ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) } 207 .rela.bss ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) } 208EOF 209if [ -n "$COMBRELOC" ]; then 210cat <<EOF 211 .rel.dyn ${RELOCATING-0} : 212 { 213EOF 214sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC 215cat <<EOF 216 } 217 .rela.dyn ${RELOCATING-0} : 218 { 219EOF 220sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC 221cat <<EOF 222 } 223EOF 224fi 225cat <<EOF 226 . = ALIGN(0x1000); 227 .rel.plt ${RELOCATING-0} : { *(.rel.plt) } 228 .rela.plt ${RELOCATING-0} : { *(.rela.plt) } 229 ${OTHER_PLT_RELOC_SECTIONS} 230 ${DATA_PLT-${BSS_PLT-${PLT}}} 231 .text ${RELOCATING-0} : 232 { 233 ${RELOCATING+${TEXT_START_SYMBOLS}} 234 *(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*}) 235 /* .gnu.warning sections are handled specially by elf32.em. */ 236 *(.gnu.warning) 237 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 238 } =${NOP-0} 239 .fini ${RELOCATING-0} : 240 { 241 ${RELOCATING+${FINI_START}} 242 KEEP (*(.fini)) 243 ${RELOCATING+${FINI_END}} 244 } =${NOP-0} 245 ${RELOCATING+PROVIDE (__etext = .);} 246 ${RELOCATING+PROVIDE (_etext = .);} 247 ${RELOCATING+PROVIDE (etext = .);} 248 . = ALIGN(0x1000); 249 ${CREATE_SHLIB-${SDATA2}} 250 ${CREATE_SHLIB-${SBSS2}} 251 ${OTHER_READONLY_SECTIONS} 252 .eh_frame_hdr : { *(.eh_frame_hdr) } 253 254 . = ALIGN(0x1000); 255 .data ${RELOCATING-0} : 256 { 257 *(.rodata .rodata.*) 258 *(.rodata1) 259 *(.gnu.linkonce.r.*) 260 ${RELOCATING+${DATA_START_SYMBOLS}} 261 *(.data${RELOCATING+ .data.* .gnu.linkonce.d.*}) 262 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 263 KEEP (*(.eh_frame)) 264 *(.gcc_except_table) 265 ${CTOR} 266 ${DTOR} 267 KEEP (*(.jcr)) 268 } 269 .data1 ${RELOCATING-0} : { *(.data1) } 270 . = ALIGN(0x1000); 271 .gcc_except_table ${RELOCATING-0} : { *(.gcc_except_table) } 272 ${WRITABLE_RODATA+${RODATA}} 273 ${OTHER_READWRITE_SECTIONS} 274 ${TEXT_DYNAMIC-${DYNAMIC}} 275 ${DATA_PLT+${PLT}} 276 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 277 .got ${RELOCATING-0} : { *(.got.plt) *(.got) } 278 ${OTHER_GOT_SECTIONS} 279 ${CREATE_SHLIB+${SDATA2}} 280 ${CREATE_SHLIB+${SBSS2}} 281 ${SDATA} 282 ${OTHER_SDATA_SECTIONS} 283 ${RELOCATING+_edata = .;} 284 ${RELOCATING+PROVIDE (edata = .);} 285 ${RELOCATING+__bss_start = .;} 286 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 287 ${SBSS} 288 ${BSS_PLT+${PLT}} 289 . = ALIGN(0x1000); 290 .bss ${RELOCATING-0} : 291 { 292 *(.dynbss) 293 *(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*}) 294 *(COMMON) 295 /* Align here to ensure that the .bss section occupies space up to 296 _end. Align after .bss to ensure correct alignment even if the 297 .bss section disappears because there are no input sections. */ 298 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 299 } 300 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 301 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 302 ${RELOCATING+${OTHER_END_SYMBOLS}} 303 ${RELOCATING+_end = .;} 304 ${RELOCATING+PROVIDE (end = .);} 305 306 /* Stabs debugging sections. */ 307 . = ALIGN(0x1000); 308 .stab 0 : { *(.stab) } 309 .stabstr 0 : { *(.stabstr) } 310 .stab.excl 0 : { *(.stab.excl) } 311 .stab.exclstr 0 : { *(.stab.exclstr) } 312 .stab.index 0 : { *(.stab.index) } 313 .stab.indexstr 0 : { *(.stab.indexstr) } 314 315 . = ALIGN(0x1000); 316 .comment 0 : { *(.comment) } 317 318 /* DWARF debug sections. 319 Symbols in the DWARF debugging sections are relative to the beginning 320 of the section so we begin them at 0. */ 321 322 /* DWARF 1 */ 323 .debug 0 : { *(.debug) } 324 .line 0 : { *(.line) } 325 326 /* GNU DWARF 1 extensions */ 327 .debug_srcinfo 0 : { *(.debug_srcinfo) } 328 .debug_sfnames 0 : { *(.debug_sfnames) } 329 330 /* DWARF 1.1 and DWARF 2 */ 331 .debug_aranges 0 : { *(.debug_aranges) } 332 .debug_pubnames 0 : { *(.debug_pubnames) } 333 334 /* DWARF 2 */ 335 .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } 336 .debug_abbrev 0 : { *(.debug_abbrev) } 337 .debug_line 0 : { *(.debug_line) } 338 .debug_frame 0 : { *(.debug_frame) } 339 .debug_str 0 : { *(.debug_str) } 340 .debug_loc 0 : { *(.debug_loc) } 341 .debug_macinfo 0 : { *(.debug_macinfo) } 342 343 /* SGI/MIPS DWARF 2 extensions */ 344 .debug_weaknames 0 : { *(.debug_weaknames) } 345 .debug_funcnames 0 : { *(.debug_funcnames) } 346 .debug_typenames 0 : { *(.debug_typenames) } 347 .debug_varnames 0 : { *(.debug_varnames) } 348 349 ${STACK_ADDR+${STACK}} 350 ${OTHER_SECTIONS} 351 ${RELOCATING+${OTHER_SYMBOLS}} 352} 353EOF 354