378 lines
14 KiB
Python
378 lines
14 KiB
Python
#
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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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# 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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# 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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# .tdata .gnu.linkonce.td.foo
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# .tbss .gnu.linkonce.tb.foo
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#
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# Each of these can also have corresponding .rel.* and .rela.* sections.
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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 "$LD_FLAG" = "N" && DATA_ADDR=.
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test -n "$CREATE_SHLIB$CREATE_PIE" && test -n "$SHLIB_DATA_ADDR" && COMMONPAGESIZE=""
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test -z "$CREATE_SHLIB$CREATE_PIE" && test -n "$DATA_ADDR" && COMMONPAGESIZE=""
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DATA_SEGMENT_ALIGN="ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1))"
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DATA_SEGMENT_END=""
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if test -n "${COMMONPAGESIZE}"; then
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DATA_SEGMENT_ALIGN="ALIGN (${SEGMENT_SIZE}) - ((${MAXPAGESIZE} - .) & (${MAXPAGESIZE} - 1)); . = DATA_SEGMENT_ALIGN (${MAXPAGESIZE}, ${COMMONPAGESIZE})"
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DATA_SEGMENT_END=". = DATA_SEGMENT_END (.);"
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fi
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INTERP=".interp ALIGN(4) : { *(.interp) }"
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PLT=".plt : { *(.plt) } :dynamic :dyn"
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DYNAMIC=".dynamic : { *(.dynamic) } :dynamic :dyn"
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RODATA=".rodata ALIGN(4) : { *(.rodata${RELOCATING+ .rodata.* .gnu.linkonce.r.*}) }"
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STACKNOTE="/DISCARD/ : { *(.note.GNU-stack) *(.directive) }"
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test -z "$GOT" && GOT=".got ${RELOCATING-0} : { *(.got.plt) *(.got) } :dynamic :dyn"
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CTOR=".ctors ALIGN(4) :
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{
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${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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KEEP (*crtbegin*.o(.ctors))
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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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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+${CTOR_END}}
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} :text"
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DTOR=".dtors ALIGN(4) :
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{
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${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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} :text"
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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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} :data"
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# if this is for an embedded system, don't add SIZEOF_HEADERS.
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if [ -z "$EMBEDDED" ]; then
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test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR} + SIZEOF_HEADERS"
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else
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test -z "${TEXT_BASE_ADDRESS}" && TEXT_BASE_ADDRESS="${TEXT_START_ADDR}"
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fi
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cat <<EOF
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OUTPUT_FORMAT("${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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${RELOCATING+${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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${RELOCATING- /* For some reason, the Solaris linker makes bad executables
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if gld -r is used and the intermediate file has sections starting
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at non-zero addresses. Could be a Solaris ld bug, could be a GNU ld
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bug. But for now assigning the zero vmas works. */}
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PHDRS
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{
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headers PT_PHDR PHDRS ;
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text PT_LOAD ;
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data PT_LOAD ;
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dyn PT_LOAD FLAGS (0) ;
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dynamic PT_DYNAMIC ;
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}
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SECTIONS
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{
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/* Read-only sections, merged into text segment: */
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${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${TEXT_BASE_ADDRESS};}}}
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${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}}
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${CREATE_PIE+${RELOCATING+. = ${SHLIB_TEXT_START_ADDR:-0};}}
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${CREATE_SHLIB-${INTERP}}
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${INITIAL_READONLY_SECTIONS}
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.init ALIGN(4) :
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{
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${RELOCATING+${INIT_START}}
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KEEP (*(.init))
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${RELOCATING+${INIT_END}}
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} :text =${NOP-0}
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.text ALIGN(4) :
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{
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${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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} =${NOP-0}
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${RELOCATING+${CTOR}}
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${RELOCATING+${DTOR}}
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.fini ALIGN(4) :
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{
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${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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${RELOCATING+PROVIDE (etext = .);}
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${WRITABLE_RODATA-${RODATA}}
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.rodata1 ALIGN(4) : { *(.rodata1) }
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ExportTable ALIGN(4) : { KEEP (*(ExportTable)) }
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.eh_frame_hdr ALIGN(4) : { *(.eh_frame_hdr) } :text
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/* Adjust the address for the data segment. We want to adjust up to
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the same address within the page on the next page up. */
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. = ALIGN(128) + (. & (128 - 1));
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/* Ensure the __preinit_array_start label is properly aligned. We
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could instead move the label definition inside the section, but
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the linker would then create the section even if it turns out to
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be empty, which isn't pretty. */
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${RELOCATING+. = ALIGN(${ALIGNMENT});}
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__preinit_array_start = .);}}
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.preinit_array ${RELOCATING-0} : { *(.preinit_array) }
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__preinit_array_end = .);}}
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__init_array_start = .);}}
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.init_array ${RELOCATING-0} : { *(.init_array) }
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__init_array_end = .);}}
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__fini_array_start = .);}}
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.fini_array ${RELOCATING-0} : { *(.fini_array) }
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${RELOCATING+${CREATE_SHLIB-PROVIDE (__fini_array_end = .);}}
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${CREATE_SHLIB-${CREATE_PIE-${RELOCATING+. = ${DATA_ADDR-${DATA_SEGMENT_ALIGN}};}}}
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${CREATE_SHLIB+${RELOCATING+. = ${SHLIB_DATA_ADDR-${DATA_SEGMENT_ALIGN}};}}
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${CREATE_PIE+${RELOCATING+. = ${SHLIB_DATA_ADDR-${DATA_SEGMENT_ALIGN}};}}
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.data ALIGN(4) :
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{
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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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} :data
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.data1 ALIGN(4) : { *(.data1) } :data
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.tdata ALIGN(4) : { *(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*}) } :data
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.tbss ALIGN(4) : { *(.tbss${RELOCATING+ .tbss.* .gnu.linkonce.tb.*})${RELOCATING+ *(.tcommon)} } :data
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.eh_frame ALIGN(4) : { KEEP (*(.eh_frame)) } :data
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.gcc_except_table ALIGN(4) : { *(.gcc_except_table) } :data
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${WRITABLE_RODATA+${RODATA}}
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${OTHER_READWRITE_SECTIONS}
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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+${OTHER_BSS_SYMBOLS}}
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${BSS_PLT+${PLT}}
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.bss ALIGN(4) :
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{
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*(.dynbss)
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*(.bss${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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} :data
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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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${RELOCATING+PROVIDE (end = .);}
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${RELOCATING+${DATA_SEGMENT_END}}
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${TEXT_DYNAMIC-${DYNAMIC}}
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${TEXT_DYNAMIC+${DYNAMIC}}
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.hash ${RELOCATING-0} : { *(.hash) } :dynamic :dyn
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.dynsym ${RELOCATING-0} : { *(.dynsym) } :dynamic :dyn
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.dynstr ${RELOCATING-0} : { *(.dynstr) } :dynamic :dyn
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${DATA_PLT-${BSS_PLT-${PLT}}}
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.got.plt : { *(.got.plt) } :dynamic :dyn
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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 ${RELOCATING-0}: { *(.gnu.version_r) }
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EOF
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if [ "x$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.tdata ${RELOCATING-0} : { *(.rel.tdata${RELOCATING+ .rel.tdata.* .rel.gnu.linkonce.td.*}) }
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.rela.tdata ${RELOCATING-0} : { *(.rela.tdata${RELOCATING+ .rela.tdata.* .rela.gnu.linkonce.td.*}) }
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.rel.tbss ${RELOCATING-0} : { *(.rel.tbss${RELOCATING+ .rel.tbss.* .rel.gnu.linkonce.tb.*}) }
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.rela.tbss ${RELOCATING-0} : { *(.rela.tbss${RELOCATING+ .rela.tbss.* .rela.gnu.linkonce.tb.*}) }
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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.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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.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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/* Stabs debugging sections. */
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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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.comment 0 : { *(.comment) }
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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 .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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/* 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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${STACK_ADDR+${STACK}}
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${OTHER_SECTIONS}
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${RELOCATING+${OTHER_END_SYMBOLS}}
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${RELOCATING+${STACKNOTE}}
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}
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EOF
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