gcc/config/m68k/m68kemb.h

   1 /* Definitions of target machine for GNU compiler.  "embedded" 68XXX.
   2    This is meant to be included after m68k.h.
   3    Copyright (C) 1994-2018 Free Software Foundation, Inc.  */
   4
   5 /* Override the SVR4 ABI for this target.  */
   6
   7 #define PTRDIFF_TYPE "long int"
   8 #define SIZE_TYPE "long unsigned int"
   9
  10 /* In order for bitfields to work on a 68000, or with -mnobitfield, we must
  11    define either PCC_BITFIELD_TYPE_MATTERS or STRUCTURE_SIZE_BOUNDARY.
  12    Defining STRUCTURE_SIZE_BOUNDARY results in structure packing problems,
  13    so we define PCC_BITFIELD_TYPE_MATTERS.  */
  14 #define PCC_BITFIELD_TYPE_MATTERS 1
  15
  16 /* Don't default to pcc-struct-return, so that we can return small structures
  17    and unions in registers, which is slightly more efficient.  */
  18 #define DEFAULT_PCC_STRUCT_RETURN 0
  19
  20 #undef FUNCTION_VALUE
  21 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
  22
  23 #undef LIBCALL_VALUE
  24 #define LIBCALL_VALUE(MODE)                                     \
  25   m68k_libcall_value (MODE)
  26
  27 #undef FUNCTION_VALUE_REGNO_P
  28 #define FUNCTION_VALUE_REGNO_P(N)                       \
  29   ((N) == D0_REG || (TARGET_68881 && (N) == FP0_REG))
  30
  31 #undef NEEDS_UNTYPED_CALL
  32 #define NEEDS_UNTYPED_CALL 1
  33
  34 /* Target OS builtins.  */
  35 #define TARGET_OS_CPP_BUILTINS()                \
  36   do                                            \
  37     {                                           \
  38       builtin_define ("__embedded__");          \
  39     }                                           \
  40   while (0)
  41
  42 /* Override the default LIB_SPEC from gcc.c.  We don't currently support
  43    profiling, or libg.a.  */
  44
  45 #undef  LIB_SPEC
  46 #define LIB_SPEC "-lc"
  47
  48 /* Make this be null, since we want the crt0.o to come from the linker
  49    script */
  50
  51 #undef  STARTFILE_SPEC
  52 #define STARTFILE_SPEC ""