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1 /* Definitions of target machine for GNU compiler. "embedded" 68XXX.
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2 This is meant to be included after m68k.h.
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3 Copyright (C) 1994, 1995, 1998, 1999, 2004, 2006
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4 Free Software Foundation, Inc. */
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5
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6 /* Override the SVR4 ABI for this target. */
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7
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8 #define PTRDIFF_TYPE "long int"
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9 #define SIZE_TYPE "long unsigned int"
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10
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11 /* In order for bitfields to work on a 68000, or with -mnobitfield, we must
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12 define either PCC_BITFIELD_TYPE_MATTERS or STRUCTURE_SIZE_BOUNDARY.
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13 Defining STRUCTURE_SIZE_BOUNDARY results in structure packing problems,
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14 so we define PCC_BITFIELD_TYPE_MATTERS. */
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15 #define PCC_BITFIELD_TYPE_MATTERS 1
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16
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17 /* Don't default to pcc-struct-return, so that we can return small structures
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18 and unions in registers, which is slightly more efficient. */
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19 #define DEFAULT_PCC_STRUCT_RETURN 0
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20
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21 #undef FUNCTION_VALUE
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22 #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
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23
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24 #undef LIBCALL_VALUE
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25 #define LIBCALL_VALUE(MODE) \
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26 m68k_libcall_value (MODE)
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27
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28 #undef FUNCTION_VALUE_REGNO_P
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29 #define FUNCTION_VALUE_REGNO_P(N) \
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30 ((N) == D0_REG || (TARGET_68881 && (N) == FP0_REG))
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31
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32 #undef NEEDS_UNTYPED_CALL
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33 #define NEEDS_UNTYPED_CALL 1
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34
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35 /* Target OS builtins. */
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36 #define TARGET_OS_CPP_BUILTINS() \
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37 do \
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38 { \
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39 builtin_define ("__embedded__"); \
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40 } \
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41 while (0)
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42
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43 /* Override the default LIB_SPEC from gcc.c. We don't currently support
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44 profiling, or libg.a. */
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45
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46 #undef LIB_SPEC
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47 #define LIB_SPEC "-lc"
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48
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49 /* Make this be null, since we want the crt0.o to come from the linker
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50 script */
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51
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52 #undef STARTFILE_SPEC
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53 #define STARTFILE_SPEC ""
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