1/* Definitions of target machine for GNU compiler,
2   for m68k (including m68010) NetBSD platforms using the
3   ELF object format.
4   Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
5   Contributed by Wasabi Systems. Inc.
6
7   This file is derived from <m68k/m68kv4.h>, <m68k/m68kelf.h>,
8   and <m68k/linux.h>.
9
10This file is part of GCC.
11
12GCC is free software; you can redistribute it and/or modify
13it under the terms of the GNU General Public License as published by
14the Free Software Foundation; either version 2, or (at your option)
15any later version.
16
17GCC is distributed in the hope that it will be useful,
18but WITHOUT ANY WARRANTY; without even the implied warranty of
19MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20GNU General Public License for more details.
21
22You should have received a copy of the GNU General Public License
23along with GCC; see the file COPYING.  If not, write to
24the Free Software Foundation, 51 Franklin Street, Fifth Floor,
25Boston, MA 02110-1301, USA.  */
26
27#define TARGET_OS_CPP_BUILTINS()		\
28  do						\
29    {						\
30      NETBSD_OS_CPP_BUILTINS_ELF();		\
31      builtin_define ("__m68k__");		\
32      builtin_define ("__SVR4_ABI__");		\
33      builtin_define ("__motorola__");		\
34    }						\
35  while (0)
36
37/* Default target comes from config.gcc */
38#undef TARGET_DEFAULT
39#define TARGET_DEFAULT TARGET_CPU_DEFAULT
40
41
42/* Don't try using XFmode on the 68010.  */
43#undef LONG_DOUBLE_TYPE_SIZE
44#define LONG_DOUBLE_TYPE_SIZE			\
45  ((TARGET_68020 || TARGET_68040 || TARGET_68040_ONLY || \
46    TARGET_68060) ? 80 : 64)
47
48#ifdef __mc68010__
49#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
50#else
51#define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
52#endif
53
54#define EXTRA_SPECS \
55  { "cpp_cpu_default_spec", CPP_CPU_DEFAULT_SPEC }, \
56  { "cpp_cpu_spec",         CPP_CPU_SPEC }, \
57  { "cpp_fpu_spec",         CPP_FPU_SPEC }, \
58  { "asm_default_spec",     ASM_DEFAULT_SPEC }, \
59  { "netbsd_cpp_spec",      NETBSD_CPP_SPEC }, \
60  { "netbsd_entry_point",   NETBSD_ENTRY_POINT },
61
62
63#define CPP_CPU_SPEC \
64  "%{m68010:-D__mc68010__} \
65   %{m68020:-D__mc68020__} \
66   %{m68030:-D__mc68030__} \
67   %{m68040:-D__mc68040__} \
68   %(cpp_cpu_default_spec)"
69
70
71#undef TARGET_VERSION
72#if TARGET_DEFAULT & MASK_68020
73#define TARGET_VERSION fprintf (stderr, " (NetBSD/m68k ELF)");
74#define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68020__}"
75#define ASM_DEFAULT_SPEC "%{!m680*:-m68020}"
76#else
77#define TARGET_VERSION fprintf (stderr, " (NetBSD/68010 ELF)");
78#define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68010__}"
79#define ASM_DEFAULT_SPEC "%{!m680*:-m68010}"
80#endif
81
82
83#if TARGET_DEFAULT & MASK_68881
84#define CPP_FPU_SPEC "%{!msoft-float:-D__HAVE_68881__ -D__HAVE_FPU__}"
85#else
86#define CPP_FPU_SPEC "%{m68881:-D__HAVE_68881__ -D__HAVE_FPU__}"
87#endif
88
89
90/* Provide a CPP_SPEC appropriate for NetBSD m68k targets.  Currently we
91   deal with the GCC option '-posix', as well as an indication as to
92   whether or not use of the FPU is allowed.  */
93
94#undef CPP_SPEC
95#define CPP_SPEC \
96  "%(netbsd_cpp_spec) %(cpp_cpu_spec) %(cpp_fpu_spec)"
97
98
99/* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets.  We pass
100   on some CPU options, as well as PIC code generation options.  */
101
102#undef ASM_SPEC
103#define ASM_SPEC \
104  "%(asm_default_spec) \
105    %{m68010} %{m68020} %{m68030} %{m68040} %{m68060} \
106    %{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
107
108#define AS_NEEDS_DASH_FOR_PIPED_INPUT
109
110/* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target.  */
111
112#undef LINK_SPEC
113#define LINK_SPEC NETBSD_LINK_SPEC_ELF
114
115#define NETBSD_ENTRY_POINT "_start"
116
117/* Output assembler code to FILE to increment profiler label # LABELNO
118   for profiling a function only.  */
119
120#undef FUNCTION_PROFILER
121#define FUNCTION_PROFILER(FILE, LABELNO)				\
122do									\
123  {									\
124    asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO));	\
125    if (flag_pic)							\
126      fprintf (FILE, "\tbsr.l __mcount@PLTPC\n");			\
127    else								\
128      fprintf (FILE, "\tjbsr __mcount\n");				\
129  }									\
130while (0)
131
132
133/* Make gcc agree with <machine/ansi.h>  */
134
135#undef SIZE_TYPE
136#define SIZE_TYPE "unsigned int"
137
138#undef PTRDIFF_TYPE
139#define PTRDIFF_TYPE "int"
140
141
142/* XXX
143   Here is a bunch of stuff lifted from m68kelf.h.  We don't use that
144   file directly, because it has a lot of baggage we don't want.  */
145
146
147/* The prefix for register names.  Note that REGISTER_NAMES
148   is supposed to include this prefix.  Also note that this is NOT an
149   fprintf format string, it is a literal string.  */
150
151#undef REGISTER_PREFIX
152#define REGISTER_PREFIX "%"
153
154
155/* The prefix for local (compiler generated) lables.
156   These labels will not appear in the symbol table.  */
157
158#undef LOCAL_LABEL_PREFIX
159#define LOCAL_LABEL_PREFIX "."
160
161
162/* The prefix to add to user-visible assembler symbols.  */
163
164#undef USER_LABEL_PREFIX
165#define USER_LABEL_PREFIX ""
166
167
168/* The prefix for immediate operands.  */
169
170#undef IMMEDIATE_PREFIX
171#define IMMEDIATE_PREFIX "#"
172
173
174#undef ASM_COMMENT_START
175#define ASM_COMMENT_START "|"
176
177
178/* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
179   keep switch tables in the text section.  */
180
181#undef JUMP_TABLES_IN_TEXT_SECTION
182#define JUMP_TABLES_IN_TEXT_SECTION 1
183
184
185/* Use the default action for outputting the case label.  */
186#undef ASM_OUTPUT_CASE_LABEL
187#define ASM_RETURN_CASE_JUMP				\
188  do {							\
189    if (TARGET_COLDFIRE)				\
190      {							\
191	if (ADDRESS_REG_P (operands[0]))		\
192	  return "jmp %%pc@(2,%0:l)";			\
193	else						\
194	  return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";	\
195      }							\
196    else						\
197      return "jmp %%pc@(2,%0:w)";			\
198  } while (0)
199
200
201/* This is how to output an assembler line that says to advance the
202   location counter to a multiple of 2**LOG bytes.  */
203
204#undef ASM_OUTPUT_ALIGN
205#define ASM_OUTPUT_ALIGN(FILE,LOG)					\
206do									\
207  {									\
208    if ((LOG) > 0)							\
209      fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));		\
210  }									\
211while (0)
212
213
214/* If defined, a C expression whose value is a string containing the
215   assembler operation to identify the following data as uninitialized global
216   data.  */
217
218#define BSS_SECTION_ASM_OP	".section\t.bss"
219
220
221/* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
222   separate, explicit argument.  If you define this macro, it is used
223   in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
224   handling the required alignment of the variable.  The alignment is
225   specified as the number of bits.
226
227   Try to use function `asm_output_aligned_bss' defined in file
228   `varasm.c' when defining this macro.  */
229
230#undef ASM_OUTPUT_ALIGNED_BSS
231#define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN)		\
232  asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
233
234
235#undef ASM_OUTPUT_COMMON
236#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)			\
237( fputs (".comm ", (FILE)),						\
238  assemble_name ((FILE), (NAME)),					\
239  fprintf ((FILE), ",%u\n", (int)(SIZE)))
240
241#undef ASM_OUTPUT_LOCAL
242#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)			\
243( fputs (".lcomm ", (FILE)),						\
244  assemble_name ((FILE), (NAME)),					\
245  fprintf ((FILE), ",%u\n", (int)(SIZE)))
246
247
248/* XXX
249   This is the end of the chunk lifted from m68kelf.h  */
250
251
252/* XXX
253   The following chunk is more or less lifted from m68kv4.h.
254   We'd like to just #include that file, but it has not yet
255   been converted to the new include style.
256
257   Should there be a m68kv4-abi.h ??  */
258
259
260/* Register in which address to store a structure value is passed to a
261   function.  The default in m68k.h is a1.  For m68k/SVR4 it is a0. */
262
263#undef M68K_STRUCT_VALUE_REGNUM
264#define M68K_STRUCT_VALUE_REGNUM 8
265
266
267/* Register in which static-chain is passed to a function.  The
268   default isn m68k.h is a0, but that is already the struct value
269   regnum.  Make it a1 instead.  */
270
271#undef STATIC_CHAIN_REGNUM
272#define STATIC_CHAIN_REGNUM 9
273
274
275/* Now to renumber registers for dbx and gdb.
276   We use the Sun-3 convention, which is:
277   floating point registers have numbers 18 to 25, not
278   16 to 23 as they do in the compiler.  */
279
280#undef DBX_REGISTER_NUMBER
281#define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
282
283
284/* 1 if N is a possible register number for a function value.  For
285   m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
286   pointer, or floating types, respectively.  Reject fp0 if not using
287   a 68881 coprocessor.  */
288
289#undef FUNCTION_VALUE_REGNO_P
290#define FUNCTION_VALUE_REGNO_P(N)					\
291  ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
292
293
294/* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
295   more than one register.  */
296
297#undef NEEDS_UNTYPED_CALL
298#define NEEDS_UNTYPED_CALL 1
299
300
301/* Define how to generate (in the callee) the output value of a
302   function and how to find (in the caller) the value returned by a
303   function.  VALTYPE is the data type of the value (as a tree).  If
304   the precise function being called is known, FUNC is its
305   FUNCTION_DECL; otherwise, FUNC is 0.  For m68k/SVR4 generate the
306   result in d0, a0, or fp0 as appropriate.  */
307
308#undef FUNCTION_VALUE
309#define FUNCTION_VALUE(VALTYPE, FUNC)					\
310  (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881			\
311   ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16)				\
312   : (POINTER_TYPE_P (VALTYPE)						\
313      ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8)				\
314      : gen_rtx_REG (TYPE_MODE (VALTYPE), 0)))
315
316
317/* For compatibility with the large body of existing code which does
318   not always properly declare external functions returning pointer
319   types, the m68k/SVR4 convention is to copy the value returned for
320   pointer functions from a0 to d0 in the function epilogue, so that
321   callers that have neglected to properly declare the callee can
322   still find the correct return value.  */
323
324extern int current_function_returns_pointer;
325#define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) 				\
326do									\
327  {									\
328    if (current_function_returns_pointer				\
329	&& ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode))	\
330      asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n");			\
331  }									\
332while (0)
333
334
335/* Define how to find the value returned by a library function
336   assuming the value has mode MODE.
337   For m68k/SVR4 look for integer values in d0, pointer values in d0
338   (returned in both d0 and a0), and floating values in fp0.  */
339
340#undef LIBCALL_VALUE
341#define LIBCALL_VALUE(MODE)						\
342  ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)		\
343    && TARGET_68881)							\
344   ? gen_rtx_REG (MODE, 16)						\
345   : gen_rtx_REG (MODE, 0))
346
347
348/* Boundary (in *bits*) on which stack pointer should be aligned.
349   The m68k/SVR4 convention is to keep the stack pointer longword aligned.  */
350
351#undef STACK_BOUNDARY
352#define STACK_BOUNDARY 32
353
354
355/* Alignment of field after `int : 0' in a structure.
356   For m68k/SVR4, this is the next longword boundary.  */
357
358#undef EMPTY_FIELD_BOUNDARY
359#define EMPTY_FIELD_BOUNDARY 32
360
361
362/* No data type wants to be aligned rounder than this.
363   For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
364   boundaries */
365
366#undef BIGGEST_ALIGNMENT
367#define BIGGEST_ALIGNMENT 64
368
369
370/* For m68k SVR4, structures are returned using the reentrant
371   technique.  */
372
373#undef PCC_STATIC_STRUCT_RETURN
374
375
376/* The svr4 ABI for the m68k says that records and unions are returned
377   in memory.  */
378
379#undef DEFAULT_PCC_STRUCT_RETURN
380#define DEFAULT_PCC_STRUCT_RETURN 1
381
382/* Output assembler code for a block containing the constant parts
383   of a trampoline, leaving space for the variable parts.  */
384
385/* On m68k svr4, the trampoline is different from the generic version
386   in that we use a1 as the static call chain.  */
387
388#undef TRAMPOLINE_TEMPLATE
389#define TRAMPOLINE_TEMPLATE(FILE)					\
390{									\
391  assemble_aligned_integer (2, GEN_INT (0x227a));			\
392  assemble_aligned_integer (2, GEN_INT (8));				\
393  assemble_aligned_integer (2, GEN_INT (0x2f3a));			\
394  assemble_aligned_integer (2, GEN_INT (8));				\
395  assemble_aligned_integer (2, GEN_INT (0x4e75));			\
396  assemble_aligned_integer (4, const0_rtx);				\
397  assemble_aligned_integer (4, const0_rtx);				\
398}
399
400/* Redefine since we are using a different trampoline */
401#undef TRAMPOLINE_SIZE
402#define TRAMPOLINE_SIZE 18
403
404/* Emit RTL insns to initialize the variable parts of a trampoline.
405   FNADDR is an RTX for the address of the function's pure code.
406   CXT is an RTX for the static chain value for the function.  */
407
408#undef INITIALIZE_TRAMPOLINE
409#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			\
410{									\
411  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
412  emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
413}
414
415
416/* XXX
417   This is the end of the chunk lifted from m68kv4.h  */
418