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, 1995, 1998, 1999 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 /* Undef PCC_STATIC_STRUCT_RETURN so that we get a re-entrant calling
  17    convention.  */
  18 #undef PCC_STATIC_STRUCT_RETURN
  19
  20 /* Don't default to pcc-struct-return, so that we can return small structures
  21    and unions in registers, which is slightly more efficient.  */
  22 #define DEFAULT_PCC_STRUCT_RETURN 0
  23
  24 /* Return floating point values in a fp register.  This make fp code a
  25    little bit faster.  It also makes -msoft-float code incompatible with
  26    -m68881 code, so people have to be careful not to mix the two.  */
  27 #undef FUNCTION_VALUE
  28 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
  29
  30 #undef LIBCALL_VALUE
  31 #define LIBCALL_VALUE(MODE)                                     \
  32  gen_rtx_REG ((MODE),                                           \
  33               ((TARGET_68881                                    \
  34                 && ((MODE) == SFmode || (MODE) == DFmode        \
  35                     || (MODE) == XFmode))                       \
  36            ? 16 : 0))
  37
  38 #undef FUNCTION_VALUE_REGNO_P
  39 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (TARGET_68881 && (N) == 16))
  40
  41 #undef NEEDS_UNTYPED_CALL
  42 #define NEEDS_UNTYPED_CALL 1
  43
  44 /* Target OS builtins.  */
  45 #define TARGET_OS_CPP_BUILTINS()                \
  46   do                                            \
  47     {                                           \
  48         builtin_define_std ("mc68000");         \
  49         builtin_define ("__embedded__");        \
  50    }                                            \
  51   while (0)
  52
  53 /* Override the default LIB_SPEC from gcc.c.  We don't currently support
  54    profiling, or libg.a.  */
  55
  56 #undef  LIB_SPEC
  57 #define LIB_SPEC "-lc"
  58
  59 /* Make this be null, since we want the crt0.o to come from the linker
  60    script */
  61
  62 #undef  STARTFILE_SPEC
  63 #define STARTFILE_SPEC ""