mirror of
https://sourceware.org/git/binutils-gdb.git
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71b012a810
* ldgram.y (ldgram_had_keep, KEEP): New.
(input_section_spec_no_keep): Rename from old input_section_spec.
(input_section_spec): New. Recognize KEEP.
* ldlang.c (wild_section): Handle keep sections.
(lang_gc_wild_section, lang_gc_wild_file, lang_gc_wild): New.
(lang_gc_sections_1, lang_gc_sections): New.
(lang_process): Invoke lang_gc_sections.
(lang_add_wild): Add keep argument. Update all callers.
* ldlang.h (lang_wild_statement_struct): Add keep_sections.
* ldlex.l (KEEP): Match it.
* ldmain.c (main): Error on -r and --gc-sections.
* lexsup.c: Add --gc-sections.
* scripttempl/elf.sc: Merge .text.* etc sections appropriately.
Mark startup sections with KEEP.
* scripttempl/elfppc.sc: Likewise.
* ld.texinfo: Update for --gc-sections and KEEP.
251 lines
8.8 KiB
Scala
251 lines
8.8 KiB
Scala
#
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# Unusual variables checked by this code:
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# NOP - two byte opcode for no-op (defaults to 0)
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# DATA_ADDR - if end-of-text-plus-one-page isn't right for data start
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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_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
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# (e.g., .PARISC.global)
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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_BSS_SYMBOLS - symbols that appear at the start of the
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# .bss section besides __bss_start.
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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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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=${OUTPUT_FORMAT}
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test "$LD_FLAG" = "N" && DATA_ADDR=.
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SBSS2=".sbss2 ${RELOCATING-0} : { *(.sbss2) }"
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SDATA2=".sdata2 ${RELOCATING-0} : { *(.sdata2) }"
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INTERP=".interp ${RELOCATING-0} : { *(.interp) }"
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PLT=".plt ${RELOCATING-0} : { *(.plt) }"
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cat <<EOF
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OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
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"${LITTLE_OUTPUT_FORMAT}")
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OUTPUT_ARCH(${ARCH})
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ENTRY(${ENTRY})
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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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${RELOCATING- /* For some reason, the Solaris linker makes bad executables
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if gld -r is used and the intermediate file has sections starting
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at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld
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bug. But for now assigning the zero vmas works. */}
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${RELOCATING+PROVIDE (__stack = 0);}
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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+. = ${TEXT_START_ADDR} + SIZEOF_HEADERS;}}
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${CREATE_SHLIB+${RELOCATING+. = SIZEOF_HEADERS;}}
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${CREATE_SHLIB-${INTERP}}
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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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.rela.text ${RELOCATING-0} :
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{
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*(.rela.text)
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${RELOCATING+*(.rela.text.*)}
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${RELOCATING+*(.rela.gnu.linkonce.t*)}
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}
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.rela.data ${RELOCATING-0} :
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{
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*(.rela.data)
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${RELOCATING+*(.rela.data.*)}
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${RELOCATING+*(.rela.gnu.linkonce.d*)}
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}
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.rela.rodata ${RELOCATING-0} :
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{
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*(.rela.rodata)
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${RELOCATING+*(.rela.rodata.*)}
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${RELOCATING+*(.rela.gnu.linkonce.r*)}
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}
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.rela.got ${RELOCATING-0} : { *(.rela.got) }
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.rela.got1 ${RELOCATING-0} : { *(.rela.got1) }
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.rela.got2 ${RELOCATING-0} : { *(.rela.got2) }
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.rela.ctors ${RELOCATING-0} : { *(.rela.ctors) }
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.rela.dtors ${RELOCATING-0} : { *(.rela.dtors) }
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.rela.init ${RELOCATING-0} : { *(.rela.init) }
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.rela.fini ${RELOCATING-0} : { *(.rela.fini) }
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.rela.bss ${RELOCATING-0} : { *(.rela.bss) }
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.rela.plt ${RELOCATING-0} : { *(.rela.plt) }
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.rela.sdata ${RELOCATING-0} : { *(.rela.sdata) }
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.rela.sbss ${RELOCATING-0} : { *(.rela.sbss) }
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.rela.sdata2 ${RELOCATING-0} : { *(.rela.sdata2) }
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.rela.sbss2 ${RELOCATING-0} : { *(.rela.sbss2) }
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.text ${RELOCATING-0} :
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{
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${RELOCATING+${TEXT_START_SYMBOLS}}
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*(.text)
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${RELOCATING+*(.text.*)}
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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${RELOCATING+*(.gnu.linkonce.t*)}
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} =${NOP-0}
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.init ${RELOCATING-0} : { KEEP (*(.init)) } =${NOP-0}
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.fini ${RELOCATING-0} : { KEEP (*(.fini)) } =${NOP-0}
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.rodata ${RELOCATING-0} :
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{
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*(.rodata)
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${RELOCATING+*(.rodata.*)}
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${RELOCATING+*(.gnu.linkonce.r*)}
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}
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.rodata1 ${RELOCATING-0} : { *(.rodata1) }
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${RELOCATING+_etext = .;}
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${RELOCATING+PROVIDE (etext = .);}
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${CREATE_SHLIB-${SDATA2}}
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${CREATE_SHLIB-${SBSS2}}
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${RELOCATING+${OTHER_READONLY_SECTIONS}}
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. It would
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be more correct to do this:
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${RELOCATING+. = ${DATA_ADDR-ALIGN(${MAXPAGESIZE}) + (ALIGN(8) & (${MAXPAGESIZE} - 1))};}
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The current expression does not correctly handle the case of a
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text segment ending precisely at the end of a page; it causes the
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data segment to skip a page. The above expression does not have
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this problem, but it will currently (2/95) cause BFD to allocate
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a single segment, combining both text and data, for this case.
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This will prevent the text segment from being shared among
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multiple executions of the program; I think that is more
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important than losing a page of the virtual address space (note
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that no actual memory is lost; the page which is skipped can not
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be referenced). */
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${RELOCATING+. = ${DATA_ADDR- ALIGN(8) + ${MAXPAGESIZE}};}
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.data ${RELOCATING-0} :
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{
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${RELOCATING+${DATA_START_SYMBOLS}}
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*(.data)
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${RELOCATING+*(.data.*)}
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${RELOCATING+*(.gnu.linkonce.d*)}
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${CONSTRUCTING+CONSTRUCTORS}
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}
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.data1 ${RELOCATING-0} : { *(.data1) }
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${RELOCATING+${OTHER_READWRITE_SECTIONS}}
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.got1 ${RELOCATING-0} : { *(.got1) }
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.dynamic ${RELOCATING-0} : { *(.dynamic) }
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/* Put .ctors and .dtors next to the .got2 section, so that the pointers
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get relocated with -mrelocatable. Also put in the .fixup pointers.
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The current compiler no longer needs this, but keep it around for 2.7.2 */
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${RELOCATING+PROVIDE (_GOT2_START_ = .);}
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.got2 ${RELOCATING-0} : { *(.got2) }
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${RELOCATING+PROVIDE (__CTOR_LIST__ = .);}
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.ctors ${RELOCATING-0} : {
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/* gcc uses crtbegin.o to find the start of
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the constructors, so we make sure it is
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first. Because this is a wildcard, it
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doesn't matter if the user does not
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actually link against crtbegin.o; the
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linker won't look for a file to match a
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wildcard. The wildcard also means that it
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doesn't matter which directory crtbegin.o
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is in. */
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KEEP (*crtbegin.o(.ctors))
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KEEP (*(SORT(.ctors.*)))
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KEEP (*(.ctors)) }
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${RELOCATING+PROVIDE (__CTOR_END__ = .);}
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${RELOCATING+PROVIDE (__DTOR_LIST__ = .);}
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.dtors ${RELOCATING-0} : {
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KEEP (*crtbegin.o(.dtors))
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KEEP (*(SORT(.dtors.*)))
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KEEP (*(.dtors)) }
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${RELOCATING+PROVIDE (__DTOR_END__ = .);}
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${RELOCATING+PROVIDE (_FIXUP_START_ = .);}
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.fixup ${RELOCATING-0} : { *(.fixup) }
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${RELOCATING+PROVIDE (_FIXUP_END_ = .);}
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${RELOCATING+PROVIDE (_GOT2_END_ = .);}
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${RELOCATING+PROVIDE (_GOT_START_ = .);}
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.got ${RELOCATING-0} : { *(.got) }
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.got.plt ${RELOCATING-0} : { *(.got.plt) }
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${CREATE_SHLIB+${SDATA2}}
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${CREATE_SHLIB+${SBSS2}}
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${RELOCATING+PROVIDE (_GOT_END_ = .);}
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/* 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 ${RELOCATING-0} : { *(.sdata) }
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${RELOCATING+_edata = .;}
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${RELOCATING+PROVIDE (edata = .);}
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.sbss ${RELOCATING-0} :
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{
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${RELOCATING+PROVIDE (__sbss_start = .);}
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*(.sbss)
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*(.scommon)
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*(.dynsbss)
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${RELOCATING+PROVIDE (__sbss_end = .);}
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}
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${PLT}
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.bss ${RELOCATING-0} :
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{
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${RELOCATING+${OTHER_BSS_SYMBOLS}}
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${RELOCATING+PROVIDE (__bss_start = .);}
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*(.dynbss)
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*(.bss)
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*(COMMON)
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}
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${RELOCATING+_end = . ;}
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${RELOCATING+PROVIDE (end = .);}
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/* These are needed for ELF backends which have not yet been
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converted to the new style linker. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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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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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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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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/* 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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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info) }
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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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/* 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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/* These must appear regardless of ${RELOCATING}. */
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${OTHER_SECTIONS}
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}
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EOF
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