ld/emulparams/elf64mmix.sh

   1 TEMPLATE_NAME=elf32
   2 GENERATE_SHLIB_SCRIPT=yes
   3 ELFSIZE=64
   4 SCRIPT_NAME=elf
   5 OUTPUT_FORMAT="elf64-mmix"
   6 ENTRY=_start.
   7
   8 # Default to 0 as mmixal does.
   9 TEXT_START_ADDR='DEFINED (__.MMIX.start..text) ? __.MMIX.start..text : 0'
  10 # Don't add SIZEOF_HEADERS.
  11 # Don't set EMBEDDED, that would be misleading; it's not that kind of system.
  12 TEXT_BASE_ADDRESS=$TEXT_START_ADDR
  13 DATA_ADDR='DEFINED (__.MMIX.start..data) ? __.MMIX.start..data : 0x2000000000000000'
  14
  15 # Setting this anywhere near the quite reasonable value of 0x10000
  16 # causes the binary to bloat to reach page alignment between segments.
  17 # Let's just have a 256-byte default page alignment.  Having some
  18 # alignment at all gives a warm feeling but not much more.
  19 MAXPAGESIZE=256
  20 ARCH=mmix
  21 MACHINE=
  22 COMPILE_IN=yes
  23 EXTRA_EM_FILE=mmixelf
  24
  25 # The existence of a symbol __start (or _start) should overrule Main, so
  26 # it can be a user symbol without the associated mmixal magic.  We
  27 # also want to provide Main as a synonym for _start, if Main wasn't
  28 # defined but is referred to, and _start was defined.
  29 #
  30 # The reason we use a symbol "_start." as a mediator is to avoid
  31 # causing ld to force the type of _start to object rather than no
  32 # type, which confuses disassembly; we also make it alphanumerically
  33 # a successor of _start for similar reasons.  Perhaps it's a linker
  34 # bug that linker-defined symbols set the symbol-type.
  35 #
  36 # Note that we smuggle this into OTHER_TEXT_SECTIONS (at the end
  37 # of .text) rather than TEXT_START_SYMBOLS.  This is necessary, as
  38 # DEFINED wouldn't find the symbol if it was at the top; presumably
  39 # before the definition, if the definition is not in the first file.
  40 # FIXME: Arguably a linker bug.
  41 OTHER_TEXT_SECTIONS='
  42  _start. = (DEFINED (_start) ? _start
  43             : (DEFINED (Main) ? Main : (DEFINED (.text) ? .text : 0)));
  44  PROVIDE (Main = DEFINED (Main) ? Main : (DEFINED (_start) ? _start : _start.));
  45 '
  46
  47 OTHER_SECTIONS='
  48  .MMIX.reg_contents :
  49  {
  50    /* Note that this section always has a fixed VMA - that of its
  51       first register * 8.  */
  52    *(.MMIX.reg_contents.linker_allocated);
  53    *(.MMIX.reg_contents);
  54  }
  55 '
  56
  57 # FIXME: Also bit by the PROVIDE bug?  If not, this could be
  58 # EXECUTABLE_SYMBOLS.
  59 # By default, put the high end of the stack where the register stack
  60 # begins.  They grow in opposite directions.  */
  61 OTHER_SYMBOLS="PROVIDE (__Stack_start = 0x6000000000000000);"