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_BSS_SECTIONS - other than .bss .sbss ...
  11 #       OTHER_SECTIONS - at the end
  12 #       EXECUTABLE_SYMBOLS - symbols that must be defined for an
  13 #               executable (e.g., _DYNAMIC_LINK)
  14 #       TEXT_START_SYMBOLS - symbols that appear at the start of the
  15 #               .text section.
  16 #       DATA_START_SYMBOLS - symbols that appear at the start of the
  17 #               .data section.
  18 #       OTHER_GOT_SYMBOLS - symbols defined just before .got.
  19 #       OTHER_GOT_SECTIONS - sections just after .got and .sdata.
  20 #       OTHER_BSS_SYMBOLS - symbols that appear at the start of the
  21 #               .bss section besides __bss_start.
  22 #       INPUT_FILES - INPUT command of files to always include
  23 #       INIT_START, INIT_END -  statements just before and just after
  24 #       combination of .init sections.
  25 #       FINI_START, FINI_END - statements just before and just after
  26 #       combination of .fini sections.
  27 #
  28 # When adding sections, do note that the names of some sections are used
  29 # when specifying the start address of the next.
  30 #
  31
  32 #  Many sections come in three flavours.  There is the 'real' section,
  33 #  like ".data".  Then there are the per-procedure or per-variable
  34 #  sections, generated by -ffunction-sections and -fdata-sections in GCC,
  35 #  and useful for --gc-sections, which for a variable "foo" might be
  36 #  ".data.foo".  Then there are the linkonce sections, for which the linker
  37 #  eliminates duplicates, which are named like ".gnu.linkonce.d.foo".
  38 #  The exact correspondences are:
  39 #
  40 #  Section      Linkonce section
  41 #  .text        .gnu.linkonce.t.foo
  42 #  .rodata      .gnu.linkonce.r.foo
  43 #  .data        .gnu.linkonce.d.foo
  44 #  .bss         .gnu.linkonce.b.foo
  45 #  .sdata       .gnu.linkonce.s.foo
  46 #  .sbss        .gnu.linkonce.sb.foo
  47 #  .sdata2      .gnu.linkonce.s2.foo
  48 #  .sbss2       .gnu.linkonce.sb2.foo
  49 #
  50 #  Each of these can also have corresponding .rel.* and .rela.* sections.
  51
  52 test -z "$ENTRY" && ENTRY=_start
  53 test -z "${BIG_OUTPUT_FORMAT}" && BIG_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  54 test -z "${LITTLE_OUTPUT_FORMAT}" && LITTLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
  55 if [ -z "$MACHINE" ]; then OUTPUT_ARCH=${ARCH}; else OUTPUT_ARCH=${ARCH}:${MACHINE}; fi
  56 test -z "${ELFSIZE}" && ELFSIZE=32
  57 test -z "${ALIGNMENT}" && ALIGNMENT="${ELFSIZE} / 8"
  58 CTOR=".ctors ${CONSTRUCTING-0} :
  59   {
  60     ${CONSTRUCTING+${CTOR_START}}
  61     /* gcc uses crtbegin.o to find the start of
  62        the constructors, so we make sure it is
  63        first.  Because this is a wildcard, it
  64        doesn't matter if the user does not
  65        actually link against crtbegin.o; the
  66        linker won't look for a file to match a
  67        wildcard.  The wildcard also means that it
  68        doesn't matter which directory crtbegin.o
  69        is in.  */
  70
  71     KEEP (*crtbegin.o(.ctors))
  72
  73     /* We don't want to include the .ctor section from
  74        from the crtend.o file until after the sorted ctors.
  75        The .ctor section from the crtend file contains the
  76        end of ctors marker and it must be last */
  77
  78     KEEP (*(EXCLUDE_FILE (*crtend.o $OTHER_EXCLUDE_FILES) .ctors))
  79     KEEP (*(SORT(.ctors.*)))
  80     KEEP (*(.ctors))
  81     ${CONSTRUCTING+${CTOR_END}}
  82   } > ROM"
  83
  84 DTOR=" .dtors       ${CONSTRUCTING-0} :
  85   {
  86     ${CONSTRUCTING+${DTOR_START}}
  87     KEEP (*crtbegin.o(.dtors))
  88     KEEP (*(EXCLUDE_FILE (*crtend.o $OTHER_EXCLUDE_FILES) .dtors))
  89     KEEP (*(SORT(.dtors.*)))
  90     KEEP (*(.dtors))
  91     ${CONSTRUCTING+${DTOR_END}}
  92   } > ROM"
  93
  94 cat <<EOF
  95 OUTPUT_FORMAT("${OUTPUT_FORMAT}", "${BIG_OUTPUT_FORMAT}",
  96               "${LITTLE_OUTPUT_FORMAT}")
  97 OUTPUT_ARCH(${OUTPUT_ARCH})
  98 ENTRY(${ENTRY})
  99
 100 ${RELOCATING+${LIB_SEARCH_DIRS}}
 101 ${RELOCATING+${EXECUTABLE_SYMBOLS}}
 102 ${RELOCATING+${INPUT_FILES}}
 103 ${RELOCATING- /* For some reason, the Solaris linker makes bad executables
 104   if gld -r is used and the intermediate file has sections starting
 105   at non-zero addresses.  Could be a Solaris ld bug, could be a GNU ld
 106   bug.  But for now assigning the zero vmas works.  */}
 107
 108 /* There are two memory regions we care about, one from 0 through 0x7F00
 109    that is RAM and one from 0x8000 up which is ROM.  */
 110 MEMORY
 111 {
 112   RAM (w) : ORIGIN = 0, LENGTH = 0x7F00
 113   ROM (!w) : ORIGIN = 0x8000, LENGTH = 0xFF8000
 114 }
 115
 116 SECTIONS
 117 {
 118   .data  ${RELOCATING-0} :
 119   {
 120     ${RELOCATING+${DATA_START_SYMBOLS}}
 121     *(.data)
 122     ${RELOCATING+*(.data.*)}
 123     ${RELOCATING+*(.gnu.linkonce.d.*)}
 124     ${CONSTRUCTING+SORT(CONSTRUCTORS)}
 125   } > RAM
 126   ${RELOCATING+${OTHER_READWRITE_SECTIONS}}
 127   ${RELOCATING+${OTHER_GOT_SYMBOLS}}
 128   ${RELOCATING+${OTHER_GOT_SECTIONS}}
 129   ${RELOCATING+_edata = .;}
 130   ${RELOCATING+PROVIDE (edata = .);}
 131   ${RELOCATING+__bss_start = .;}
 132   ${RELOCATING+${OTHER_BSS_SYMBOLS}}
 133   .bss     ${RELOCATING-0} :
 134   {
 135    *(.dynbss)
 136    *(.bss)
 137    ${RELOCATING+*(.bss.*)}
 138    ${RELOCATING+*(.gnu.linkonce.b.*)}
 139    *(COMMON)
 140    /* Align here to ensure that the .bss section occupies space up to
 141       _end.  Align after .bss to ensure correct alignment even if the
 142       .bss section disappears because there are no input sections.  */
 143    ${RELOCATING+. = ALIGN(${ALIGNMENT});}
 144   } > RAM
 145   ${RELOCATING+${OTHER_BSS_SECTIONS}}
 146   ${RELOCATING+. = ALIGN(${ALIGNMENT});}
 147   ${RELOCATING+__stack = .;}
 148   ${RELOCATING+. = . + 4096;}
 149   ${RELOCATING+_end = .;}
 150   ${RELOCATING+${OTHER_BSS_END_SYMBOLS}}
 151   ${RELOCATING+PROVIDE (end = .);}
 152
 153   /* Read-only sections in ROM.  */
 154   .int_vec     ${RELOCATING-0} : { *(.int_vec)  } > ROM
 155
 156   .rodata ${RELOCATING-0} : { *(.rodata) ${RELOCATING+*(.rodata.*)} ${RELOCATING+*(.gnu.linkonce.r.*)} } > ROM
 157   ${RELOCATING+${CTOR}}
 158   ${RELOCATING+${DTOR}}
 159   .eh_frame : { KEEP (*(.eh_frame)) } > ROM
 160   .gcc_except_table : { *(.gcc_except_table) } > ROM
 161   .plt : { *(.plt) } > ROM
 162
 163   .text    ${RELOCATING-0} :
 164   {
 165     ${RELOCATING+${TEXT_START_SYMBOLS}}
 166     *(.text)
 167     ${RELOCATING+*(.text.*)}
 168     *(.stub)
 169     /* .gnu.warning sections are handled specially by elf32.em.  */
 170     *(.gnu.warning)
 171     ${RELOCATING+*(.gnu.linkonce.t.*)}
 172     ${RELOCATING+${OTHER_TEXT_SECTIONS}}
 173   } > ROM =${NOP-0}
 174   .init        ${RELOCATING-0} :
 175   {
 176     ${RELOCATING+${INIT_START}}
 177     KEEP (*(.init))
 178     ${RELOCATING+${INIT_END}}
 179   } > ROM =${NOP-0}
 180   .fini    ${RELOCATING-0} :
 181   {
 182     ${RELOCATING+${FINI_START}}
 183     KEEP (*(.fini))
 184     ${RELOCATING+${FINI_END}}
 185   } > ROM =${NOP-0}
 186   ${RELOCATING+PROVIDE (__etext = .);}
 187   ${RELOCATING+PROVIDE (_etext = .);}
 188   ${RELOCATING+PROVIDE (etext = .);}
 189   ${RELOCATING+${OTHER_READONLY_SECTIONS}}
 190
 191
 192   /* Stabs debugging sections.  */
 193   .stab 0 : { *(.stab) }
 194   .stabstr 0 : { *(.stabstr) }
 195   .stab.excl 0 : { *(.stab.excl) }
 196   .stab.exclstr 0 : { *(.stab.exclstr) }
 197   .stab.index 0 : { *(.stab.index) }
 198   .stab.indexstr 0 : { *(.stab.indexstr) }
 199
 200   .comment 0 : { *(.comment) }
 201
 202   /* DWARF debug sections.
 203      Symbols in the DWARF debugging sections are relative to the beginning
 204      of the section so we begin them at 0.  */
 205
 206   /* DWARF 1 */
 207   .debug          0 : { *(.debug) }
 208   .line           0 : { *(.line) }
 209
 210   /* GNU DWARF 1 extensions */
 211   .debug_srcinfo  0 : { *(.debug_srcinfo) }
 212   .debug_sfnames  0 : { *(.debug_sfnames) }
 213
 214   /* DWARF 1.1 and DWARF 2 */
 215   .debug_aranges  0 : { *(.debug_aranges) }
 216   .debug_pubnames 0 : { *(.debug_pubnames) }
 217
 218   /* DWARF 2 */
 219   .debug_info     0 : { *(.debug_info) *(.gnu.linkonce.wi.*) }
 220   .debug_abbrev   0 : { *(.debug_abbrev) }
 221   .debug_line     0 : { *(.debug_line) }
 222   .debug_frame    0 : { *(.debug_frame) }
 223   .debug_str      0 : { *(.debug_str) }
 224   .debug_loc      0 : { *(.debug_loc) }
 225   .debug_macinfo  0 : { *(.debug_macinfo) }
 226
 227   /* SGI/MIPS DWARF 2 extensions */
 228   .debug_weaknames 0 : { *(.debug_weaknames) }
 229   .debug_funcnames 0 : { *(.debug_funcnames) }
 230   .debug_typenames 0 : { *(.debug_typenames) }
 231   .debug_varnames  0 : { *(.debug_varnames) }
 232
 233   ${RELOCATING+${OTHER_RELOCATING_SECTIONS}}
 234
 235   /* These must appear regardless of ${RELOCATING}.  */
 236   ${OTHER_SECTIONS}
 237 }
 238 EOF