Nick Clifton
25 years ago
5 changed files with 366 additions and 3 deletions
@ -0,0 +1,354 @@ |
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# |
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# Unusual variables checked by this code: |
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# NOP - four byte opcode for no-op (defaults to 0) |
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# NO_SMALL_DATA - no .sbss/.sbss2/.sdata/.sdata2 sections if not |
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# empty. |
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# DATA_ADDR - if end-of-text-plus-one-page isn't right for data start |
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# INITIAL_READONLY_SECTIONS - at start of text segment |
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# OTHER_READONLY_SECTIONS - other than .text .init .rodata ... |
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# (e.g., .PARISC.milli) |
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# OTHER_TEXT_SECTIONS - these get put in .text when relocating |
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# OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ... |
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# (e.g., .PARISC.global) |
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# OTHER_BSS_SECTIONS - other than .bss .sbss ... |
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# OTHER_SECTIONS - at the end |
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# EXECUTABLE_SYMBOLS - symbols that must be defined for an |
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# executable (e.g., _DYNAMIC_LINK) |
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# TEXT_START_SYMBOLS - symbols that appear at the start of the |
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# .text section. |
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# DATA_START_SYMBOLS - symbols that appear at the start of the |
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# .data section. |
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# OTHER_GOT_SYMBOLS - symbols defined just before .got. |
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# OTHER_GOT_SECTIONS - sections just after .got. |
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# OTHER_SDATA_SECTIONS - sections just after .sdata. |
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# OTHER_BSS_SYMBOLS - symbols that appear at the start of the |
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# .bss section besides __bss_start. |
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# DATA_PLT - .plt should be in data segment, not text segment. |
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# BSS_PLT - .plt should be in bss segment |
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# TEXT_DYNAMIC - .dynamic in text segment, not data segment. |
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# EMBEDDED - whether this is for an embedded system. |
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# SHLIB_TEXT_START_ADDR - if set, add to SIZEOF_HEADERS to set |
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# start address of shared library. |
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# INPUT_FILES - INPUT command of files to always include |
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# WRITABLE_RODATA - if set, the .rodata section should be writable |
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# INIT_START, INIT_END - statements just before and just after |
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# combination of .init sections. |
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# FINI_START, FINI_END - statements just before and just after |
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# combination of .fini sections. |
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# STACK_ADDR - start of a .stack section. |
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# OTHER_END_SYMBOLS - symbols to place right at the end of the script. |
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# |
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# When adding sections, do note that the names of some sections are used |
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# when specifying the start address of the next. |
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# |
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|
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# Many sections come in three flavours. There is the 'real' section, |
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# like ".data". Then there are the per-procedure or per-variable |
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# sections, generated by -ffunction-sections and -fdata-sections in GCC, |
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# and useful for --gc-sections, which for a variable "foo" might be |
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# ".data.foo". Then there are the linkonce sections, for which the linker |
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# eliminates duplicates, which are named like ".gnu.linkonce.d.foo". |
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# The exact correspondences are: |
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# |
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# Section Linkonce section |
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# .text .gnu.linkonce.t.foo |
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# .rodata .gnu.linkonce.r.foo |
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# .data .gnu.linkonce.d.foo |
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# .bss .gnu.linkonce.b.foo |
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# .sdata .gnu.linkonce.s.foo |
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# .sbss .gnu.linkonce.sb.foo |
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# .sdata2 .gnu.linkonce.s2.foo |
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# .sbss2 .gnu.linkonce.sb2.foo |
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# .debug_info .gnu.linkonce.wi.foo |
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# |
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# Each of these can also have corresponding .rel.* and .rela.* sections. |
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|
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test -z "$ENTRY" && ENTRY=_start |
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test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT} |
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test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT} |
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if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi |
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test -z "${ELFSIZE}" && ELFSIZE=32 |
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test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8" |
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test "$LD_FLAG" = "N" && DATA_ADDR=. |
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INTERP=".interp ${RELOCATING-0} : { *(.interp) }" |
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PLT=".plt ${RELOCATING-0} : { *(.plt) }" |
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DYNAMIC=".dynamic ${RELOCATING-0} : { *(.dynamic) }" |
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RODATA=".rodata ${RELOCATING-0} : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }" |
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if test -z "${NO_SMALL_DATA}"; then |
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SBSS=".sbss ${RELOCATING-0} : |
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{ |
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${RELOCATING+PROVIDE (__sbss_start = .);} |
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${RELOCATING+PROVIDE (___sbss_start = .);} |
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*(.dynsbss) |
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*(.sbss${RELOCATING+ .sbss.* .gnu.linkonce.sb.*}) |
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*(.scommon) |
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${RELOCATING+PROVIDE (__sbss_end = .);} |
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${RELOCATING+PROVIDE (___sbss_end = .);} |
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}" |
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SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2${RELOCATING+ .sbss2.* .gnu.linkonce.sb2.*}) }" |
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SDATA="/* We want the small data sections together, so single-instruction offsets |
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can access them all, and initialized data all before uninitialized, so |
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we can shorten the on-disk segment size. */ |
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.sdata ${RELOCATING-0} : |
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{ |
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${RELOCATING+${SDATA_START_SYMBOLS}} |
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*(.sdata${RELOCATING+ .sdata.* .gnu.linkonce.s.*}) |
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}" |
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SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2${RELOCATING+ .sdata2.* .gnu.linkonce.s2.*}) }" |
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REL_SDATA=".rel.sdata ${RELOCATING-0} : { *(.rel.sdata${RELOCATING+ .rel.sdata.* .rel.gnu.linkonce.s.*}) } |
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.rela.sdata ${RELOCATING-0} : { *(.rela.sdata${RELOCATING+ .rela.sdata.* .rela.gnu.linkonce.s.*}) }" |
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REL_SBSS=".rel.sbss ${RELOCATING-0} : { *(.rel.sbss${RELOCATING+ .rel.sbss.* .rel.gnu.linkonce.sb.*}) } |
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.rela.sbss ${RELOCATING-0} : { *(.rela.sbss${RELOCATING+ .rela.sbss.* .rela.gnu.linkonce.sb.*}) }" |
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REL_SDATA2=".rel.sdata2 ${RELOCATING-0} : { *(.rel.sdata2${RELOCATING+ .rel.sdata2.* .rel.gnu.linkonce.s2.*}) } |
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.rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2${RELOCATING+ .rela.sdata2.* .rela.gnu.linkonce.s2.*}) }" |
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REL_SBSS2=".rel.sbss2 ${RELOCATING-0} : { *(.rel.sbss2${RELOCATING+ .rel.sbss2.* .rel.gnu.linkonce.sb2.*}) } |
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.rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2${RELOCATING+ .rela.sbss2.* .rela.gnu.linkonce.sb2.*}) }" |
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fi |
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CTOR=" |
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${CONSTRUCTING+${CTOR_START}} |
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/* gcc uses crtbegin.o to find the start of |
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the constructors, so we make sure it is |
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first. Because this is a wildcard, it |
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doesn't matter if the user does not |
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actually link against crtbegin.o; the |
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linker won't look for a file to match a |
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wildcard. The wildcard also means that it |
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doesn't matter which directory crtbegin.o |
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is in. */ |
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|
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KEEP (*crtbegin.o(.ctors)) |
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|
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/* We don't want to include the .ctor section from |
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from the crtend.o file until after the sorted ctors. |
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The .ctor section from the crtend file contains the |
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end of ctors marker and it must be last */ |
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|
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KEEP (*(EXCLUDE_FILE (*crtend.o $OTHER_EXCLUDE_FILES) .ctors)) |
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KEEP (*(SORT(.ctors.*))) |
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KEEP (*(.ctors)) |
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${CONSTRUCTING+${CTOR_END}} |
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" |
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DTOR=" |
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${CONSTRUCTING+${DTOR_START}} |
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KEEP (*crtbegin.o(.dtors)) |
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KEEP (*(EXCLUDE_FILE (*crtend.o $OTHER_EXCLUDE_FILES) .dtors)) |
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KEEP (*(SORT(.dtors.*))) |
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KEEP (*(.dtors)) |
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${CONSTRUCTING+${DTOR_END}} |
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" |
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STACK=" .stack ${RELOCATING-0}${RELOCATING+${STACK_ADDR}} : |
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{ |
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${RELOCATING+_stack = .;} |
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*(.stack) |
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}" |
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|
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test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}" |
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|
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cat <<EOF |
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OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}", |
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"${LITTLE_OUTPUT_FORMAT}") |
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OUTPUT_ARCH(${OUTPUT_ARCH}) |
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ENTRY(${ENTRY}) |
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|
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${RELOCATING+${LIB_SEARCH_DIRS}} |
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${RELOCATING+/* Do we need any of these for elf? |
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__DYNAMIC = 0; ${STACKZERO+${STACKZERO}} ${SHLIB_PATH+${SHLIB_PATH}} */} |
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${RELOCATING+${EXECUTABLE_SYMBOLS}} |
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${RELOCATING+${INPUT_FILES}} |
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${RELOCATING- /* For some reason, the Solaris linker makes bad executables |
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if gld -r is used and the intermediate file has sections starting |
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at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld |
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bug. But for now assigning the zero vmas works. */} |
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|
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SECTIONS |
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{ |
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/* Read-only sections, merged into text segment: */ |
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${CREATE_SHLIB-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}} |
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${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}} |
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${CREATE_SHLIB-${INTERP}} |
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${INITIAL_READONLY_SECTIONS} |
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${TEXT_DYNAMIC+${DYNAMIC}} |
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.hash ${RELOCATING-0} : { *(.hash) } |
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.dynsym ${RELOCATING-0} : { *(.dynsym) } |
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.dynstr ${RELOCATING-0} : { *(.dynstr) } |
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.gnu.version ${RELOCATING-0} : { *(.gnu.version) } |
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.gnu.version_d ${RELOCATING-0}: { *(.gnu.version_d) } |
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.gnu.version_r ${RELOCATING-0}: { *(.gnu.version_r) } |
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|
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EOF |
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if [ "x$COMBRELOC" = x ]; then |
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COMBRELOCCAT=cat |
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else |
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COMBRELOCCAT="cat > $COMBRELOC" |
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fi |
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eval $COMBRELOCCAT <<EOF |
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.rel.init ${RELOCATING-0} : { *(.rel.init) } |
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.rela.init ${RELOCATING-0} : { *(.rela.init) } |
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.rel.text ${RELOCATING-0} : { *(.rel.text${RELOCATING+ .rel.text.* .rel.gnu.linkonce.t.*}) } |
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.rela.text ${RELOCATING-0} : { *(.rela.text${RELOCATING+ .rela.text.* .rela.gnu.linkonce.t.*}) } |
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.rel.fini ${RELOCATING-0} : { *(.rel.fini) } |
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.rela.fini ${RELOCATING-0} : { *(.rela.fini) } |
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.rel.rodata ${RELOCATING-0} : { *(.rel.rodata${RELOCATING+ .rel.rodata.* .rel.gnu.linkonce.r.*}) } |
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.rela.rodata ${RELOCATING-0} : { *(.rela.rodata${RELOCATING+ .rela.rodata.* .rela.gnu.linkonce.r.*}) } |
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${OTHER_READONLY_RELOC_SECTIONS} |
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.rel.data ${RELOCATING-0} : { *(.rel.data${RELOCATING+ .rel.data.* .rel.gnu.linkonce.d.*}) } |
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.rela.data ${RELOCATING-0} : { *(.rela.data${RELOCATING+ .rela.data.* .rela.gnu.linkonce.d.*}) } |
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.rel.ctors ${RELOCATING-0} : { *(.rel.ctors) } |
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.rela.ctors ${RELOCATING-0} : { *(.rela.ctors) } |
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.rel.dtors ${RELOCATING-0} : { *(.rel.dtors) } |
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.rela.dtors ${RELOCATING-0} : { *(.rela.dtors) } |
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.rel.got ${RELOCATING-0} : { *(.rel.got) } |
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.rela.got ${RELOCATING-0} : { *(.rela.got) } |
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${OTHER_GOT_RELOC_SECTIONS} |
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${REL_SDATA} |
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${REL_SBSS} |
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${REL_SDATA2} |
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${REL_SBSS2} |
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.rel.bss ${RELOCATING-0} : { *(.rel.bss${RELOCATING+ .rel.bss.* .rel.gnu.linkonce.b.*}) } |
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.rela.bss ${RELOCATING-0} : { *(.rela.bss${RELOCATING+ .rela.bss.* .rela.gnu.linkonce.b.*}) } |
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EOF |
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if [ -n "$COMBRELOC" ]; then |
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cat <<EOF |
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.rel.dyn ${RELOCATING-0} : |
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{ |
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EOF |
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sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rela\./d;s/^.*: { *\(.*\)}$/ \1/' $COMBRELOC |
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cat <<EOF |
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} |
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.rela.dyn ${RELOCATING-0} : |
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{ |
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EOF |
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sed -e '/^[ ]*[{}][ ]*$/d;/:[ ]*$/d;/\.rel\./d;s/^.*: { *\(.*\)}/ \1/' $COMBRELOC |
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cat <<EOF |
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} |
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EOF |
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fi |
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cat <<EOF |
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. = ALIGN(0x1000); |
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.rel.plt ${RELOCATING-0} : { *(.rel.plt) } |
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.rela.plt ${RELOCATING-0} : { *(.rela.plt) } |
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${OTHER_PLT_RELOC_SECTIONS} |
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${DATA_PLT-${BSS_PLT-${PLT}}} |
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.text ${RELOCATING-0} : |
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{ |
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${RELOCATING+${TEXT_START_SYMBOLS}} |
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*(.text .stub${RELOCATING+ .text.* .gnu.linkonce.t.*}) |
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/* .gnu.warning sections are handled specially by elf32.em. */ |
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*(.gnu.warning) |
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${RELOCATING+${OTHER_TEXT_SECTIONS}} |
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} =${NOP-0} |
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.fini ${RELOCATING-0} : |
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{ |
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${RELOCATING+${FINI_START}} |
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KEEP (*(.fini)) |
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${RELOCATING+${FINI_END}} |
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} =${NOP-0} |
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${RELOCATING+PROVIDE (__etext = .);} |
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${RELOCATING+PROVIDE (_etext = .);} |
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${RELOCATING+PROVIDE (etext = .);} |
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. = ALIGN(0x1000); |
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${CREATE_SHLIB-${SDATA2}} |
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${CREATE_SHLIB-${SBSS2}} |
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${OTHER_READONLY_SECTIONS} |
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.eh_frame_hdr : { *(.eh_frame_hdr) } |
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|
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. = ALIGN(0x1000); |
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.data ${RELOCATING-0} : |
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{ |
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*(.rodata .rodata.*) |
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*(.rodata1) |
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*(.gnu.linkonce.r.*) |
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${RELOCATING+${DATA_START_SYMBOLS}} |
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*(.data${RELOCATING+ .data.* .gnu.linkonce.d.*}) |
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${CONSTRUCTING+SORT(CONSTRUCTORS)} |
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KEEP (*(.eh_frame)) |
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*(.gcc_except_table) |
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${CTOR} |
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${DTOR} |
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KEEP (*(.jcr)) |
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} |
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.data1 ${RELOCATING-0} : { *(.data1) } |
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. = ALIGN(0x1000); |
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.gcc_except_table ${RELOCATING-0} : { *(.gcc_except_table) } |
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${WRITABLE_RODATA+${RODATA}} |
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${OTHER_READWRITE_SECTIONS} |
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${TEXT_DYNAMIC-${DYNAMIC}} |
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${DATA_PLT+${PLT}} |
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${RELOCATING+${OTHER_GOT_SYMBOLS}} |
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.got ${RELOCATING-0} : { *(.got.plt) *(.got) } |
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${OTHER_GOT_SECTIONS} |
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${CREATE_SHLIB+${SDATA2}} |
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${CREATE_SHLIB+${SBSS2}} |
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${SDATA} |
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${OTHER_SDATA_SECTIONS} |
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${RELOCATING+_edata = .;} |
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${RELOCATING+PROVIDE (edata = .);} |
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${RELOCATING+__bss_start = .;} |
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${RELOCATING+${OTHER_BSS_SYMBOLS}} |
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${SBSS} |
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${BSS_PLT+${PLT}} |
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. = ALIGN(0x1000); |
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.bss ${RELOCATING-0} : |
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{ |
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*(.dynbss) |
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*(.bss${RELOCATING+ .bss.* .gnu.linkonce.b.*}) |
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*(COMMON) |
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/* Align here to ensure that the .bss section occupies space up to |
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_end. Align after .bss to ensure correct alignment even if the |
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.bss section disappears because there are no input sections. */ |
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${RELOCATING+. = ALIGN(${ALIGNMENT});} |
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} |
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${OTHER_BSS_SECTIONS} |
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${RELOCATING+. = ALIGN(${ALIGNMENT});} |
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${RELOCATING+_end = .;} |
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${RELOCATING+${OTHER_BSS_END_SYMBOLS}} |
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${RELOCATING+PROVIDE (end = .);} |
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|
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/* Stabs debugging sections. */ |
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. = ALIGN(0x1000); |
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.stab 0 : { *(.stab) } |
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.stabstr 0 : { *(.stabstr) } |
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.stab.excl 0 : { *(.stab.excl) } |
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.stab.exclstr 0 : { *(.stab.exclstr) } |
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.stab.index 0 : { *(.stab.index) } |
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.stab.indexstr 0 : { *(.stab.indexstr) } |
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|
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. = ALIGN(0x1000); |
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.comment 0 : { *(.comment) } |
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|
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/* DWARF debug sections. |
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Symbols in the DWARF debugging sections are relative to the beginning |
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of the section so we begin them at 0. */ |
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|
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/* DWARF 1 */ |
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.debug 0 : { *(.debug) } |
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.line 0 : { *(.line) } |
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|
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/* GNU DWARF 1 extensions */ |
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.debug_srcinfo 0 : { *(.debug_srcinfo) } |
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.debug_sfnames 0 : { *(.debug_sfnames) } |
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|
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/* DWARF 1.1 and DWARF 2 */ |
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.debug_aranges 0 : { *(.debug_aranges) } |
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.debug_pubnames 0 : { *(.debug_pubnames) } |
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|
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/* DWARF 2 */ |
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.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } |
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.debug_abbrev 0 : { *(.debug_abbrev) } |
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.debug_line 0 : { *(.debug_line) } |
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.debug_frame 0 : { *(.debug_frame) } |
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.debug_str 0 : { *(.debug_str) } |
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.debug_loc 0 : { *(.debug_loc) } |
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.debug_macinfo 0 : { *(.debug_macinfo) } |
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|
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/* SGI/MIPS DWARF 2 extensions */ |
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.debug_weaknames 0 : { *(.debug_weaknames) } |
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.debug_funcnames 0 : { *(.debug_funcnames) } |
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.debug_typenames 0 : { *(.debug_typenames) } |
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.debug_varnames 0 : { *(.debug_varnames) } |
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|
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${STACK_ADDR+${STACK}} |
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${OTHER_SECTIONS} |
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${RELOCATING+${OTHER_END_SYMBOLS}} |
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} |
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EOF |
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