ld/scripttempl/xstormy16.sc

   1 #
   2 # Unusual variables checked by this code:
   3 #       NOP - two byte opcode for no-op (defaults to 0)
   4 #       INITIAL_READONLY_SECTIONS - at start of text segment
   5 #       OTHER_READONLY_SECTIONS - other than .text .init .rodata ...
   6 #               (e.g., .PARISC.milli)
   7 #       OTHER_TEXT_SECTIONS - these get put in .text when relocating
   8 #       OTHER_READWRITE_SECTIONS - other than .data .bss .ctors .sdata ...
   9 #               (e.g., .PARISC.global)
  10 #       OTHER_SECTIONS - at the end
  11 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
  12 #               executable (e.g., _DYNAMIC_LINK)
  13 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  14 #               .text section.
  15 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  16 #               .data section.
  17 #       OTHER_GOT_SYMBOLS - symbols defined just before .got.
  18 #       OTHER_GOT_SECTIONS - sections just after .got and .sdata.
  19 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  20 #               .bss section besides __bss_start.
  21 #       INPUT_FILES - INPUT command of files to always include
  22 #       INIT_START, INIT_END -  statements just before and just after
  23 #       combination of .init sections.
  24 #       FINI_START, FINI_END - statements just before and just after
  25 #       combination of .fini sections.
  26 #
  27 # When adding sections, do note that the names of some sections are used
  28 # when specifying the start address of the next.
  29 #
  30
  31 #  Many sections come in three flavours.  There is the 'real' section,
  32 #  like ".data".  Then there are the per-procedure or per-variable
  33 #  sections, generated by -ffunction-sections and -fdata-sections in GCC,
  34 #  and useful for --gc-sections, which for a variable "foo" might be
  35 #  ".data.foo".  Then there are the linkonce sections, for which the linker
  36 #  eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  37 #  The exact correspondences are:
  38 #
  39 #  Section      Linkonce section
  40 #  .text        .gnu.linkonce.t.foo
  41 #  .rodata      .gnu.linkonce.r.foo
  42 #  .data        .gnu.linkonce.d.foo
  43 #  .bss         .gnu.linkonce.b.foo
  44 #  .sdata       .gnu.linkonce.s.foo
  45 #  .sbss        .gnu.linkonce.sb.foo
  46 #  .sdata2      .gnu.linkonce.s2.foo
  47 #  .sbss2       .gnu.linkonce.sb2.foo
  48 #
  49 #  Each of these can also have corresponding .rel.* and .rela.* sections.
  50
  51 test -z "$ENTRY" && ENTRY=_start
  52 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  53 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  54 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
  55 test -z "${ELFSIZE}" && ELFSIZE=32
  56 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
  57 CTOR=".ctors ${CONSTRUCTING-0} :
  58   {
  59     ${CONSTRUCTING+${CTOR_START}}
  60     /* gcc uses crtbegin.o to find the start of
  61        the constructors, so we make sure it is
  62        first.  Because this is a wildcard, it
  63        doesn't matter if the user does not
  64        actually link against crtbegin.o; the
  65        linker won't look for a file to match a
  66        wildcard.  The wildcard also means that it
  67        doesn't matter which directory crtbegin.o
  68        is in.  */
  69
  70     KEEP (*crtbegin*.o(.ctors))
  71
  72     /* We don't want to include the .ctor section from
  73        from the crtend.o file until after the sorted ctors.
  74        The .ctor section from the crtend file contains the
  75        end of ctors marker and it must be last */
  76
  77     KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .ctors))
  78     KEEP (*(SORT(.ctors.*)))
  79     KEEP (*(.ctors))
  80     ${CONSTRUCTING+${CTOR_END}}
  81   } > ROM"
  82
  83 DTOR=" .dtors       ${CONSTRUCTING-0} :
  84   {
  85     ${CONSTRUCTING+${DTOR_START}}
  86     KEEP (*crtbegin*.o(.dtors))
  87     KEEP (*(EXCLUDE_FILE (*crtend*.o $OTHER_EXCLUDE_FILES) .dtors))
  88     KEEP (*(SORT(.dtors.*)))
  89     KEEP (*(.dtors))
  90     ${CONSTRUCTING+${DTOR_END}}
  91   } > ROM"
  92
  93 cat <<EOF
  94 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
  95               "${LITTLE_OUTPUT_FORMAT}")
  96 OUTPUT_ARCH(${OUTPUT_ARCH})
  97 ENTRY(${ENTRY})
  98
  99 ${RELOCATING+${LIB_SEARCH_DIRS}}
 100 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
 101 ${RELOCATING+${INPUT_FILES}}
 102 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables
 103   if gld -r is used and the intermediate file has sections starting
 104   at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
 105   bug.  But for now assigning the zero vmas works.  */}
 106
 107 /* There are two memory regions we care about, one from 0 through 0x7F00
 108    that is RAM and one from 0x8000 up which is ROM.  */
 109 MEMORY
 110 {
 111   RAM (w) : ORIGIN = 0, LENGTH = 0x7F00
 112   ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000
 113 }
 114
 115 SECTIONS
 116 {
 117   .data  ${RELOCATING-0} :
 118   {
 119     ${RELOCATING+__rdata = .;}
 120     ${RELOCATING+__data = .;}
 121     ${RELOCATING+${DATA_START_SYMBOLS}}
 122     *(.data)
 123     ${RELOCATING+*(.data.*)}
 124     ${RELOCATING+*(.gnu.linkonce.d.*)}
 125     ${CONSTRUCTING+SORT(CONSTRUCTORS)}
 126   } > RAM
 127   ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
 128   ${RELOCATING+${OTHER_GOT_SYMBOLS}}
 129   ${RELOCATING+${OTHER_GOT_SECTIONS}}
 130   ${RELOCATING+_edata = .;}
 131   ${RELOCATING+PROVIDE (edata = .);}
 132   ${RELOCATING+__bss_start = .;}
 133   ${RELOCATING+${OTHER_BSS_SYMBOLS}}
 134   .bss     ${RELOCATING-0} :
 135   {
 136    *(.dynbss)
 137    *(.bss)
 138    ${RELOCATING+*(.bss.*)}
 139    ${RELOCATING+*(.gnu.linkonce.b.*)}
 140    *(COMMON)
 141    /* Align here to ensure that the .bss section occupies space up to
 142       _end.  Align after .bss to ensure correct alignment even if the
 143       .bss section disappears because there are no input sections.  */
 144    ${RELOCATING+. = ALIGN(${ALIGNMENT});}
 145   } > RAM
 146   ${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
 147   ${RELOCATING+. = ALIGN(${ALIGNMENT});}
 148   ${RELOCATING+${OTHER_END_SYMBOLS}}
 149   ${RELOCATING+_end = .;}
 150   ${RELOCATING+__stack = .;}
 151   ${RELOCATING+PROVIDE (end = .);}
 152
 153   /* Read-only sections in ROM.  */
 154   .int_vec     ${RELOCATING-0} : { *(.int_vec)  } ${RELOCATING+> ROM}
 155
 156   .rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} } ${RELOCATING+> ROM}
 157   ${RELOCATING+${CTOR}}
 158   ${RELOCATING+${DTOR}}
 159   .jcr : { KEEP (*(.jcr)) } ${RELOCATING+> ROM}
 160   .eh_frame : { KEEP (*(.eh_frame)) } ${RELOCATING+> ROM}
 161   .gcc_except_table : { *(.gcc_except_table) } ${RELOCATING+> ROM}
 162   .plt : { *(.plt) } ${RELOCATING+> ROM}
 163
 164   .text    ${RELOCATING-0} :
 165   {
 166     ${RELOCATING+${TEXT_START_SYMBOLS}}
 167     *(.text)
 168     ${RELOCATING+*(.text.*)}
 169     *(.stub)
 170     /* .gnu.warning sections are handled specially by elf32.em.  */
 171     *(.gnu.warning)
 172     ${RELOCATING+*(.gnu.linkonce.t.*)}
 173     ${RELOCATING+${OTHER_TEXT_SECTIONS}}
 174   } ${RELOCATING+> ROM =${NOP-0}}
 175   .init        ${RELOCATING-0} :
 176   {
 177     ${RELOCATING+${INIT_START}}
 178     KEEP (*(.init))
 179     ${RELOCATING+${INIT_END}}
 180   } ${RELOCATING+> ROM =${NOP-0}}
 181   .fini    ${RELOCATING-0} :
 182   {
 183     ${RELOCATING+${FINI_START}}
 184     KEEP (*(.fini))
 185     ${RELOCATING+${FINI_END}}
 186   } ${RELOCATING+> ROM =${NOP-0}}
 187   ${RELOCATING+PROVIDE (__etext = .);}
 188   ${RELOCATING+PROVIDE (_etext = .);}
 189   ${RELOCATING+PROVIDE (etext = .);}
 190   ${RELOCATING+${OTHER_READONLY_SECTIONS}}
 191
 192
 193   /* Stabs debugging sections.  */
 194   .stab 0 : { *(.stab) }
 195   .stabstr 0 : { *(.stabstr) }
 196   .stab.excl 0 : { *(.stab.excl) }
 197   .stab.exclstr 0 : { *(.stab.exclstr) }
 198   .stab.index 0 : { *(.stab.index) }
 199   .stab.indexstr 0 : { *(.stab.indexstr) }
 200
 201   .comment 0 : { *(.comment) }
 202
 203   /* DWARF debug sections.
 204      Symbols in the DWARF debugging sections are relative to the beginning
 205      of the section so we begin them at 0.  */
 206
 207   /* DWARF 1 */
 208   .debug          0 : { *(.debug) }
 209   .line           0 : { *(.line) }
 210
 211   /* GNU DWARF 1 extensions */
 212   .debug_srcinfo  0 : { *(.debug_srcinfo) }
 213   .debug_sfnames  0 : { *(.debug_sfnames) }
 214
 215   /* DWARF 1.1 and DWARF 2 */
 216   .debug_aranges  0 : { *(.debug_aranges) }
 217   .debug_pubnames 0 : { *(.debug_pubnames) }
 218
 219   /* DWARF 2 */
 220   .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
 221   .debug_abbrev   0 : { *(.debug_abbrev) }
 222   .debug_line     0 : { *(.debug_line) }
 223   .debug_frame    0 : { *(.debug_frame) }
 224   .debug_str      0 : { *(.debug_str) }
 225   .debug_loc      0 : { *(.debug_loc) }
 226   .debug_macinfo  0 : { *(.debug_macinfo) }
 227
 228   /* SGI/MIPS DWARF 2 extensions */
 229   .debug_weaknames 0 : { *(.debug_weaknames) }
 230   .debug_funcnames 0 : { *(.debug_funcnames) }
 231   .debug_typenames 0 : { *(.debug_typenames) }
 232   .debug_varnames  0 : { *(.debug_varnames) }
 233
 234   ${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
 235
 236   /* These must appear regardless of ${RELOCATING}.  */
 237   ${OTHER_SECTIONS}
 238 }
 239 EOF