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. */
5 #define PTRDIFF_TYPE "long int"
6 #define SIZE_TYPE "long unsigned int"
8 /* In order for bitfields to work on a 68000, or with -mnobitfield, we must
9 define either PCC_BITFIELD_TYPE_MATTERS or STRUCTURE_SIZE_BOUNDARY.
10 Defining STRUCTURE_SIZE_BOUNDARY results in structure packing problems,
11 so we define PCC_BITFIELD_TYPE_MATTERS. */
12 #define PCC_BITFIELD_TYPE_MATTERS 1
14 /* Undef PCC_STATIC_STRUCT_RETURN so that we get a re-entrant calling
16 #undef PCC_STATIC_STRUCT_RETURN
18 /* Don't default to pcc-struct-return, so that we can return small structures
19 and unions in registers, which is slightly more efficient. */
20 #define DEFAULT_PCC_STRUCT_RETURN 0
22 /* Return floating point values in a fp register. This make fp code a
23 little bit faster. It also makes -msoft-float code incompatible with
24 -m68881 code, so people have to be careful not to mix the two. */
26 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
29 #define LIBCALL_VALUE(MODE) \
30 gen_rtx_REG ((MODE), \
32 && ((MODE) == SFmode || (MODE) == DFmode \
33 || (MODE) == XFmode)) \
36 #undef FUNCTION_VALUE_REGNO_P
37 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (TARGET_68881 && (N) == 16))
39 #undef NEEDS_UNTYPED_CALL
40 #define NEEDS_UNTYPED_CALL 1
43 #define CPP_PREDEFINES "-Dmc68000 -D__embedded__ -Asystem(embedded) \
46 /* Override the default LIB_SPEC from gcc.c. We don't currently support
47 profiling, or libg.a. */
50 #define LIB_SPEC "-lc"
52 /* Make this be null, since we want the crt0.o to come from the linker
56 #define STARTFILE_SPEC ""