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 # NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not 10 # empty. 11 # DATA_ADDR - if end-of-text-plus-one-page isn't right for data start 12 # INITIAL_READONLY_SECTIONS - at start of text segment 13 # OTHER_READONLY_SECTIONS - other than .text .init .rodata ... 14 # (e.g., .PARISC.milli) 15 # OTHER_TEXT_SECTIONS - these get put in .text when relocating 16 # OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... 17 # (e.g., .PARISC.global) 18 # ATTRS_SECTIONS - at the end 19 # OTHER_SECTIONS - at the end 20 # EXECUTABLE_SYMBOLS - symbols that must be defined for an 21 # executable (e.g., _DYNAMIC_LINK) 22 # TEXT_START_SYMBOLS - symbols that appear at the start of the 23 # .text section. 24 # DATA_START_SYMBOLS - symbols that appear at the start of the 25 # .data section. 26 # OTHER_GOT_SYMBOLS - symbols defined just before .got. 27 # OTHER_GOT_SECTIONS - sections just after .got. 28 # OTHER_SDATA_SECTIONS - sections just after .sdata. 29 # OTHER_BSS_SYMBOLS - symbols that appear at the start of the 30 # .bss section besides __bss_start. 31 # DATA_PLT - .plt should be in data segment, not text segment. 32 # BSS_PLT - .plt should be in bss segment 33 # TEXT_DYNAMIC - .dynamic in text segment, not data segment. 34 # EMBEDDED - whether this is for an embedded system. 35 # SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set 36 # start address of shared library. 37 # INPUT_FILES - INPUT command of files to always include 38 # WRITABLE_RODATA - if set, the .rodata section should be writable 39 # INIT_START, INIT_END - statements just before and just after 40 # combination of .init sections. 41 # FINI_START, FINI_END - statements just before and just after 42 # combination of .fini sections. 43 # STACK_ADDR - start of a .stack section. 44 # OTHER_SYMBOLS - symbols to place right at the end of the script. 45 # 46 # When adding sections, do note that the names of some sections are used 47 # when specifying the start address of the next. 48 # 49 50 # Many sections come in three flavours. There is the 'real' section, 51 # like ".data". Then there are the per-procedure or per-variable 52 # sections, generated by -ffunction-sections and -fdata-sections in GCC, 53 # and useful for --gc-sections, which for a variable "foo" might be 54 # ".data.foo". Then there are the linkonce sections, for which the linker 55 # eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 56 # The exact correspondences are: 57 # 58 # Section Linkonce section 59 # .text .gnu.linkonce.t.foo 60 # .rodata .gnu.linkonce.r.foo 61 # .data .gnu.linkonce.d.foo 62 # .bss .gnu.linkonce.b.foo 63 # .sdata .gnu.linkonce.s.foo 64 # .sbss .gnu.linkonce.sb.foo 65 # .sdata2 .gnu.linkonce.s2.foo 66 # .sbss2 .gnu.linkonce.sb2.foo 67 # .debug_info .gnu.linkonce.wi.foo 68 # 69 # Each of these can also have corresponding .rel.* and .rela.* sections. 70 71 test -z "$ENTRY" && ENTRY=_start 72 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} 73 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} 74 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi 75 test -z "${ELFSIZE}" && ELFSIZE=32 76 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" 77 test -z "$ATTRS_SECTIONS" && ATTRS_SECTIONS=".gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }" 78 test "$LD_FLAG" = "N" && DATA_ADDR=. 79 INTERP=".interp ${RELOCATING-0} : { *(.interp) }" 80 PLT=".plt ${RELOCATING-0} : { *(.plt) }" 81 DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }" 82 RODATA=".rodata ${RELOCATING-0} : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }" 83 if test -z "${NO_SMALL_DATA}"; then 84 SBSS=".sbss ${RELOCATING-0} : 85 { 86 ${RELOCATING+PROVIDE (__sbss_start = .);} 87 ${RELOCATING+PROVIDE (___sbss_start = .);} 88 *(.dynsbss) 89 *(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*}) 90 *(.scommon) 91 ${RELOCATING+PROVIDE (__sbss_end = .);} 92 ${RELOCATING+PROVIDE (___sbss_end = .);} 93 }" 94 SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) }" 95 SDATA="/* We want the small data sections together, so single-instruction offsets 96 can access them all, and initialized data all before uninitialized, so 97 we can shorten the on-disk segment size. */ 98 .sdata ${RELOCATING-0} : 99 { 100 ${RELOCATING+${SDATA_START_SYMBOLS}} 101 *(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*}) 102 }" 103 SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) }" 104 REL_SDATA=".rel.sdata ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) } 105 .rela.sdata ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }" 106 REL_SBSS=".rel.sbss ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) } 107 .rela.sbss ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }" 108 REL_SDATA2=".rel.sdata2 ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) } 109 .rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }" 110 REL_SBSS2=".rel.sbss2 ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) } 111 .rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }" 112 fi 113 CTOR=" 114 ${CONSTRUCTING+${CTOR_START}} 115 /* gcc uses crtbegin.o to find the start of 116 the constructors, so we make sure it is 117 first. Because this is a wildcard, it 118 doesn't matter if the user does not 119 actually link against crtbegin.o; the 120 linker won't look for a file to match a 121 wildcard. The wildcard also means that it 122 doesn't matter which directory crtbegin.o 123 is in. */ 124 125 KEEP (*crtbegin.o(.ctors)) 126 KEEP (*crtbegin?.o(.ctors)) 127 128 /* We don't want to include the .ctor section from 129 the crtend.o file until after the sorted ctors. 130 The .ctor section from the crtend file contains the 131 end of ctors marker and it must be last */ 132 133 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .ctors)) 134 KEEP (*(SORT(.ctors.*))) 135 KEEP (*(.ctors)) 136 ${CONSTRUCTING+${CTOR_END}} 137 " 138 DTOR=" 139 ${CONSTRUCTING+${DTOR_START}} 140 KEEP (*crtbegin.o(.dtors)) 141 KEEP (*crtbegin?.o(.dtors)) 142 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o $OTHER_EXCLUDE_FILES) .dtors)) 143 KEEP (*(SORT(.dtors.*))) 144 KEEP (*(.dtors)) 145 ${CONSTRUCTING+${DTOR_END}} 146 " 147 STACK=" .stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} : 148 { 149 ${RELOCATING+_stack = .;} 150 *(.stack) 151 }" 152 153 test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}" 154 155 cat <<EOF 156 /* Copyright (C) 2014 Free Software Foundation, Inc. 157 158 Copying and distribution of this script, with or without modification, 159 are permitted in any medium without royalty provided the copyright 160 notice and this notice are preserved. */ 161 162 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", 163 "${LITTLE_OUTPUT_FORMAT}") 164 OUTPUT_ARCH(${OUTPUT_ARCH}) 165 ${RELOCATING+ENTRY(${ENTRY})} 166 167 ${RELOCATING+${LIB_SEARCH_DIRS}} 168 ${RELOCATING+/* Do we need any of these for elf? 169 __DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */} 170 ${RELOCATING+${EXECUTABLE_SYMBOLS}} 171 ${RELOCATING+${INPUT_FILES}} 172 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables 173 if gld -r is used and the intermediate file has sections starting 174 at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld 175 bug. But for now assigning the zero vmas works. */} 176 177 SECTIONS 178 { 179 /* Read-only sections, merged into text segment: */ 180 ${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}} 181 ${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}} 182 ${CREATE_SHLIB-${INTERP}} 183 ${INITIAL_READONLY_SECTIONS} 184 ${TEXT_DYNAMIC+${DYNAMIC}} 185 .hash ${RELOCATING-0} : { *(.hash) } 186 .dynsym ${RELOCATING-0} : { *(.dynsym) } 187 .dynstr ${RELOCATING-0} : { *(.dynstr) } 188 .gnu.version ${RELOCATING-0} : { *(.gnu.version) } 189 .gnu.version_d ${RELOCATING-0}: { *(.gnu.version_d) } 190 .gnu.version_r ${RELOCATING-0}: { *(.gnu.version_r) } 191 192 EOF 193 if [ "x$COMBRELOC" = x ]; then 194 COMBRELOCCAT=cat 195 else 196 COMBRELOCCAT="cat > $COMBRELOC" 197 fi 198 eval $COMBRELOCCAT <<EOF 199 .rel.init ${RELOCATING-0} : { *(.rel.init) } 200 .rela.init ${RELOCATING-0} : { *(.rela.init) } 201 .rel.text ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) } 202 .rela.text ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) } 203 .rel.fini ${RELOCATING-0} : { *(.rel.fini) } 204 .rela.fini ${RELOCATING-0} : { *(.rela.fini) } 205 .rel.rodata ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) } 206 .rela.rodata ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) } 207 ${OTHER_READONLY_RELOC_SECTIONS} 208 .rel.data ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) } 209 .rela.data ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) } 210 .rel.ctors ${RELOCATING-0} : { *(.rel.ctors) } 211 .rela.ctors ${RELOCATING-0} : { *(.rela.ctors) } 212 .rel.dtors ${RELOCATING-0} : { *(.rel.dtors) } 213 .rela.dtors ${RELOCATING-0} : { *(.rela.dtors) } 214 .rel.got ${RELOCATING-0} : { *(.rel.got) } 215 .rela.got ${RELOCATING-0} : { *(.rela.got) } 216 ${OTHER_GOT_RELOC_SECTIONS} 217 ${REL_SDATA} 218 ${REL_SBSS} 219 ${REL_SDATA2} 220 ${REL_SBSS2} 221 .rel.bss ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) } 222 .rela.bss ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) } 223 EOF 224 if [ -n "$COMBRELOC" ]; then 225 cat <<EOF 226 .rel.dyn ${RELOCATING-0} : 227 { 228 EOF 229 sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC 230 cat <<EOF 231 } 232 .rela.dyn ${RELOCATING-0} : 233 { 234 EOF 235 sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC 236 cat <<EOF 237 } 238 EOF 239 fi 240 cat <<EOF 241 . = ALIGN(0x1000); 242 .rel.plt ${RELOCATING-0} : { *(.rel.plt) } 243 .rela.plt ${RELOCATING-0} : { *(.rela.plt) } 244 ${OTHER_PLT_RELOC_SECTIONS} 245 ${DATA_PLT-${BSS_PLT-${PLT}}} 246 .text ${RELOCATING-0} : 247 { 248 ${RELOCATING+${TEXT_START_SYMBOLS}} 249 *(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*}) 250 /* .gnu.warning sections are handled specially by elf32.em. */ 251 *(.gnu.warning) 252 ${RELOCATING+${OTHER_TEXT_SECTIONS}} 253 } =${NOP-0} 254 .fini ${RELOCATING-0} : 255 { 256 ${RELOCATING+${FINI_START}} 257 KEEP (*(.fini)) 258 ${RELOCATING+${FINI_END}} 259 } =${NOP-0} 260 ${RELOCATING+PROVIDE (__etext = .);} 261 ${RELOCATING+PROVIDE (_etext = .);} 262 ${RELOCATING+PROVIDE (etext = .);} 263 . = ALIGN(0x1000); 264 ${CREATE_SHLIB-${SDATA2}} 265 ${CREATE_SHLIB-${SBSS2}} 266 ${OTHER_READONLY_SECTIONS} 267 .eh_frame_hdr : { *(.eh_frame_hdr) } 268 269 . = ALIGN(0x1000); 270 .data ${RELOCATING-0} : 271 { 272 *(.rodata .rodata.*) 273 *(.rodata1) 274 *(.gnu.linkonce.r.*) 275 ${RELOCATING+${DATA_START_SYMBOLS}} 276 *(.data${RELOCATING+ .data.* .gnu.linkonce.d.*}) 277 ${CONSTRUCTING+SORT(CONSTRUCTORS)} 278 KEEP (*(.eh_frame)) 279 *(.gcc_except_table) 280 ${CTOR} 281 ${DTOR} 282 KEEP (*(.jcr)) 283 } 284 .data1 ${RELOCATING-0} : { *(.data1) } 285 . = ALIGN(0x1000); 286 .gcc_except_table ${RELOCATING-0} : { *(.gcc_except_table) } 287 ${WRITABLE_RODATA+${RODATA}} 288 ${OTHER_READWRITE_SECTIONS} 289 ${TEXT_DYNAMIC-${DYNAMIC}} 290 ${DATA_PLT+${PLT}} 291 ${RELOCATING+${OTHER_GOT_SYMBOLS}} 292 .got ${RELOCATING-0} : { *(.got.plt) *(.got) } 293 ${OTHER_GOT_SECTIONS} 294 ${CREATE_SHLIB+${SDATA2}} 295 ${CREATE_SHLIB+${SBSS2}} 296 ${SDATA} 297 ${OTHER_SDATA_SECTIONS} 298 ${RELOCATING+_edata = .;} 299 ${RELOCATING+PROVIDE (edata = .);} 300 ${RELOCATING+__bss_start = .;} 301 ${RELOCATING+${OTHER_BSS_SYMBOLS}} 302 ${SBSS} 303 ${BSS_PLT+${PLT}} 304 . = ALIGN(0x1000); 305 .bss ${RELOCATING-0} : 306 { 307 *(.dynbss) 308 *(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*}) 309 *(COMMON) 310 /* Align here to ensure that the .bss section occupies space up to 311 _end. Align after .bss to ensure correct alignment even if the 312 .bss section disappears because there are no input sections. */ 313 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 314 } 315 ${RELOCATING+${OTHER_BSS_END_SYMBOLS}} 316 ${RELOCATING+. = ALIGN(${ALIGNMENT});} 317 ${RELOCATING+${OTHER_END_SYMBOLS}} 318 ${RELOCATING+_end = .;} 319 ${RELOCATING+PROVIDE (end = .);} 320 321 /* Stabs debugging sections. */ 322 . = ALIGN(0x1000); 323 .stab 0 : { *(.stab) } 324 .stabstr 0 : { *(.stabstr) } 325 .stab.excl 0 : { *(.stab.excl) } 326 .stab.exclstr 0 : { *(.stab.exclstr) } 327 .stab.index 0 : { *(.stab.index) } 328 .stab.indexstr 0 : { *(.stab.indexstr) } 329 330 . = ALIGN(0x1000); 331 .comment 0 : { *(.comment) } 332 333 EOF 334 335 . $srcdir/scripttempl/DWARF.sc 336 337 cat <<EOF 338 ${STACK_ADDR+${STACK}} 339 ${ATTRS_SECTIONS} 340 ${OTHER_SECTIONS} 341 ${RELOCATING+${OTHER_SYMBOLS}} 342 } 343 EOF 344
