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1ee7cf4ceb
a relocatable link. The ROM region does not start at address 0, but the sections will. Makefile.am: Fix linker script dependency for the generation of eelf32xstormy16.c.
241 lines
8.1 KiB
Scala
241 lines
8.1 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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# 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 and .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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# INPUT_FILES - INPUT command of files to always include
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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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#
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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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#
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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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CTOR=".ctors ${CONSTRUCTING-0} :
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{
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${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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} > ROM"
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DTOR=" .dtors ${CONSTRUCTING-0} :
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{
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${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+${DTOR_END}}
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} > ROM"
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cat <<EOF
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OUTPUT_FORMAT("${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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${RELOCATING+${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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/* There are two memory regions we care about, one from 0 through 0x7F00
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that is RAM and one from 0x8000 up which is ROM. */
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MEMORY
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{
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RAM (w) : ORIGIN = 0, LENGTH = 0x7F00
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ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000
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}
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SECTIONS
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{
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.data ${RELOCATING-0} :
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{
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${RELOCATING+__rdata = .;}
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${RELOCATING+__data = .;}
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${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+SORT(CONSTRUCTORS)}
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} > RAM
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${RELOCATING+${OTHER_READWRITE_SECTIONS}}
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${RELOCATING+${OTHER_GOT_SYMBOLS}}
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${RELOCATING+${OTHER_GOT_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 ${RELOCATING-0} :
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{
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*(.dynbss)
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*(.bss)
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${RELOCATING+*(.bss.*)}
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${RELOCATING+*(.gnu.linkonce.b.*)}
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*(COMMON)
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/* Align here to ensure that the .bss section occupies space up to
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_end. Align after .bss to ensure correct alignment even if the
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.bss section disappears because there are no input sections. */
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${RELOCATING+. = ALIGN(${ALIGNMENT});}
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} > RAM
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${RELOCATING+${OTHER_BSS_SECTIONS}}
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${RELOCATING+. = ALIGN(${ALIGNMENT});}
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${RELOCATING+_end = .;}
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${RELOCATING+__stack = .;}
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${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
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${RELOCATING+PROVIDE (end = .);}
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/* Read-only sections in ROM. */
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.int_vec ${RELOCATING-0} : { *(.int_vec) } ${RELOCATING+> ROM}
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.rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} } ${RELOCATING+> ROM}
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${RELOCATING+${CTOR}}
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${RELOCATING+${DTOR}}
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.jcr : { KEEP (*(.jcr)) } ${RELOCATING+> ROM}
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.eh_frame : { KEEP (*(.eh_frame)) } ${RELOCATING+> ROM}
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.gcc_except_table : { *(.gcc_except_table) } ${RELOCATING+> ROM}
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.plt : { *(.plt) } ${RELOCATING+> ROM}
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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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*(.stub)
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/* .gnu.warning sections are handled specially by elf32.em. */
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*(.gnu.warning)
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${RELOCATING+*(.gnu.linkonce.t.*)}
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${RELOCATING+${OTHER_TEXT_SECTIONS}}
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} ${RELOCATING+> ROM =${NOP-0}}
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.init ${RELOCATING-0} :
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{
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${RELOCATING+${INIT_START}}
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KEEP (*(.init))
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${RELOCATING+${INIT_END}}
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} ${RELOCATING+> ROM =${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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} ${RELOCATING+> ROM =${NOP-0}}
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${RELOCATING+PROVIDE (__etext = .);}
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${RELOCATING+PROVIDE (_etext = .);}
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${RELOCATING+PROVIDE (etext = .);}
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${RELOCATING+${OTHER_READONLY_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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${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
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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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