1 /* Definitions of target machine for GNU compiler,
2 for m68k (including m68010) NetBSD platforms using the
4 Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
5 Contributed by Wasabi Systems. Inc.
7 This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
10 This file is part of GCC.
12 GCC is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2, or (at your option)
17 GCC is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with GCC; see the file COPYING. If not, write to
24 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
25 Boston, MA 02110-1301, USA. */
27 #define TARGET_OS_CPP_BUILTINS() \
30 NETBSD_OS_CPP_BUILTINS_ELF(); \
31 builtin_define ("__m68k__"); \
32 builtin_define ("__SVR4_ABI__"); \
33 builtin_define ("__motorola__"); \
34 if (TARGET_HARD_FLOAT) \
35 builtin_define ("__HAVE_FPU__"); \
39 /* Don't try using XFmode on the 68010. */
40 #undef LONG_DOUBLE_TYPE_SIZE
41 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
43 #undef LIBGCC2_LONG_DOUBLE_TYPE_SIZE
45 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
47 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
50 #undef SUBTARGET_EXTRA_SPECS
51 #define SUBTARGET_EXTRA_SPECS \
52 { "netbsd_entry_point", NETBSD_ENTRY_POINT },
56 #define TARGET_VERSION \
59 ? " (NetBSD/68010 ELF)" \
60 : " (NetBSD/m68k ELF)");
63 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets. Currently we
64 deal with the GCC option '-posix', as well as an indication as to
65 whether or not use of the FPU is allowed. */
68 #define CPP_SPEC NETBSD_CPP_SPEC
71 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets. We need
72 to passn PIC code generation options. */
75 #define ASM_SPEC "%(asm_cpu_spec) %{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
77 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
79 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target. */
82 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
84 #define NETBSD_ENTRY_POINT "_start"
86 /* Output assembler code to FILE to increment profiler label # LABELNO
87 for profiling a function only. */
89 #undef FUNCTION_PROFILER
90 #define FUNCTION_PROFILER(FILE, LABELNO) \
93 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
95 fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \
97 fprintf (FILE, "\tjbsr __mcount\n"); \
102 /* Make gcc agree with <machine/ansi.h> */
105 #define SIZE_TYPE "unsigned int"
108 #define PTRDIFF_TYPE "int"
112 Here is a bunch of stuff lifted from m68kelf.h. We don't use that
113 file directly, because it has a lot of baggage we don't want. */
116 /* The prefix for register names. Note that REGISTER_NAMES
117 is supposed to include this prefix. Also note that this is NOT an
118 fprintf format string, it is a literal string. */
120 #undef REGISTER_PREFIX
121 #define REGISTER_PREFIX "%"
124 /* The prefix for local (compiler generated) lables.
125 These labels will not appear in the symbol table. */
127 #undef LOCAL_LABEL_PREFIX
128 #define LOCAL_LABEL_PREFIX "."
131 /* The prefix to add to user-visible assembler symbols. */
133 #undef USER_LABEL_PREFIX
134 #define USER_LABEL_PREFIX ""
137 /* The prefix for immediate operands. */
139 #undef IMMEDIATE_PREFIX
140 #define IMMEDIATE_PREFIX "#"
143 #undef ASM_COMMENT_START
144 #define ASM_COMMENT_START "|"
147 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
148 keep switch tables in the text section. */
150 #undef JUMP_TABLES_IN_TEXT_SECTION
151 #define JUMP_TABLES_IN_TEXT_SECTION 1
154 /* Use the default action for outputting the case label. */
155 #undef ASM_OUTPUT_CASE_LABEL
156 #define ASM_RETURN_CASE_JUMP \
158 if (TARGET_COLDFIRE) \
160 if (ADDRESS_REG_P (operands[0])) \
161 return "jmp %%pc@(2,%0:l)"; \
163 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
166 return "jmp %%pc@(2,%0:w)"; \
170 /* This is how to output an assembler line that says to advance the
171 location counter to a multiple of 2**LOG bytes. */
173 #undef ASM_OUTPUT_ALIGN
174 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
178 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
183 /* If defined, a C expression whose value is a string containing the
184 assembler operation to identify the following data as uninitialized global
187 #define BSS_SECTION_ASM_OP ".section\t.bss"
190 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
191 separate, explicit argument. If you define this macro, it is used
192 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
193 handling the required alignment of the variable. The alignment is
194 specified as the number of bits.
196 Try to use function `asm_output_aligned_bss' defined in file
197 `varasm.c' when defining this macro. */
199 #undef ASM_OUTPUT_ALIGNED_BSS
200 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
201 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
204 #undef ASM_OUTPUT_COMMON
205 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
206 ( fputs (".comm ", (FILE)), \
207 assemble_name ((FILE), (NAME)), \
208 fprintf ((FILE), ",%u\n", (int)(SIZE)))
210 #undef ASM_OUTPUT_LOCAL
211 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
212 ( fputs (".lcomm ", (FILE)), \
213 assemble_name ((FILE), (NAME)), \
214 fprintf ((FILE), ",%u\n", (int)(SIZE)))
218 This is the end of the chunk lifted from m68kelf.h */
222 The following chunk is more or less lifted from m68kv4.h.
223 We'd like to just #include that file, but it has not yet
224 been converted to the new include style.
226 Should there be a m68kv4-abi.h ?? */
229 /* Register in which address to store a structure value is passed to a
230 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
232 #undef M68K_STRUCT_VALUE_REGNUM
233 #define M68K_STRUCT_VALUE_REGNUM 8
236 /* Register in which static-chain is passed to a function. The
237 default isn m68k.h is a0, but that is already the struct value
238 regnum. Make it a1 instead. */
240 #undef STATIC_CHAIN_REGNUM
241 #define STATIC_CHAIN_REGNUM 9
244 /* Now to renumber registers for dbx and gdb.
245 We use the Sun-3 convention, which is:
246 floating point registers have numbers 18 to 25, not
247 16 to 23 as they do in the compiler. */
249 #undef DBX_REGISTER_NUMBER
250 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
253 /* 1 if N is a possible register number for a function value. For
254 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
255 pointer, or floating types, respectively. Reject fp0 if not using
256 a 68881 coprocessor. */
258 #undef FUNCTION_VALUE_REGNO_P
259 #define FUNCTION_VALUE_REGNO_P(N) \
260 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
263 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
264 more than one register. */
266 #undef NEEDS_UNTYPED_CALL
267 #define NEEDS_UNTYPED_CALL 1
270 /* Define how to generate (in the callee) the output value of a
271 function and how to find (in the caller) the value returned by a
272 function. VALTYPE is the data type of the value (as a tree). If
273 the precise function being called is known, FUNC is its
274 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
275 result in d0, a0, or fp0 as appropriate. */
277 #undef FUNCTION_VALUE
278 #define FUNCTION_VALUE(VALTYPE, FUNC) \
279 m68k_function_value (VALTYPE, FUNC)
282 /* For compatibility with the large body of existing code which does
283 not always properly declare external functions returning pointer
284 types, the m68k/SVR4 convention is to copy the value returned for
285 pointer functions from a0 to d0 in the function epilogue, so that
286 callers that have neglected to properly declare the callee can
287 still find the correct return value. */
289 extern int current_function_returns_pointer;
290 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
293 if (current_function_returns_pointer \
294 && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
295 asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \
300 /* Define how to find the value returned by a library function
301 assuming the value has mode MODE.
302 For m68k/SVR4 look for integer values in d0, pointer values in d0
303 (returned in both d0 and a0), and floating values in fp0. */
306 #define LIBCALL_VALUE(MODE) \
307 m68k_libcall_value (MODE)
310 /* Boundary (in *bits*) on which stack pointer should be aligned.
311 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
313 #undef STACK_BOUNDARY
314 #define STACK_BOUNDARY 32
317 /* Alignment of field after `int : 0' in a structure.
318 For m68k/SVR4, this is the next longword boundary. */
320 #undef EMPTY_FIELD_BOUNDARY
321 #define EMPTY_FIELD_BOUNDARY 32
324 /* No data type wants to be aligned rounder than this.
325 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
328 #undef BIGGEST_ALIGNMENT
329 #define BIGGEST_ALIGNMENT 64
332 /* For m68k SVR4, structures are returned using the reentrant
335 #undef PCC_STATIC_STRUCT_RETURN
338 /* The svr4 ABI for the m68k says that records and unions are returned
341 #undef DEFAULT_PCC_STRUCT_RETURN
342 #define DEFAULT_PCC_STRUCT_RETURN 1
344 /* Output assembler code for a block containing the constant parts
345 of a trampoline, leaving space for the variable parts. */
347 /* On m68k svr4, the trampoline is different from the generic version
348 in that we use a1 as the static call chain. */
350 #undef TRAMPOLINE_TEMPLATE
351 #define TRAMPOLINE_TEMPLATE(FILE) \
353 assemble_aligned_integer (2, GEN_INT (0x227a)); \
354 assemble_aligned_integer (2, GEN_INT (8)); \
355 assemble_aligned_integer (2, GEN_INT (0x2f3a)); \
356 assemble_aligned_integer (2, GEN_INT (8)); \
357 assemble_aligned_integer (2, GEN_INT (0x4e75)); \
358 assemble_aligned_integer (4, const0_rtx); \
359 assemble_aligned_integer (4, const0_rtx); \
362 /* Redefine since we are using a different trampoline */
363 #undef TRAMPOLINE_SIZE
364 #define TRAMPOLINE_SIZE 18
366 /* Emit RTL insns to initialize the variable parts of a trampoline.
367 FNADDR is an RTX for the address of the function's pure code.
368 CXT is an RTX for the static chain value for the function. */
370 #undef INITIALIZE_TRAMPOLINE
371 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
373 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
374 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
379 This is the end of the chunk lifted from m68kv4.h */