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__"); \
37 /* Default target comes from config.gcc */
39 #define TARGET_DEFAULT TARGET_CPU_DEFAULT
42 /* Don't try using XFmode on the 68010. */
43 #undef LONG_DOUBLE_TYPE_SIZE
44 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
47 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
49 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
53 { "cpp_cpu_default_spec", CPP_CPU_DEFAULT_SPEC }, \
54 { "cpp_cpu_spec", CPP_CPU_SPEC }, \
55 { "cpp_fpu_spec", CPP_FPU_SPEC }, \
56 { "asm_default_spec", ASM_DEFAULT_SPEC }, \
57 { "netbsd_cpp_spec", NETBSD_CPP_SPEC }, \
58 { "netbsd_entry_point", NETBSD_ENTRY_POINT },
61 #define CPP_CPU_SPEC \
62 "%(cpp_cpu_default_spec)"
66 #if TARGET_DEFAULT & MASK_68020
67 #define TARGET_VERSION fprintf (stderr, " (NetBSD/m68k ELF)");
68 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68020__}"
69 #define ASM_DEFAULT_SPEC "%{!m680*:-m68020}"
71 #define TARGET_VERSION fprintf (stderr, " (NetBSD/68010 ELF)");
72 #define CPP_CPU_DEFAULT_SPEC "%{!m680*:-D__mc68010__}"
73 #define ASM_DEFAULT_SPEC "%{!m680*:-m68010}"
77 #if TARGET_DEFAULT & MASK_68881
78 #define CPP_FPU_SPEC "%{!msoft-float:-D__HAVE_68881__ -D__HAVE_FPU__}"
80 #define CPP_FPU_SPEC "%{m68881:-D__HAVE_68881__ -D__HAVE_FPU__}"
84 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets. Currently we
85 deal with the GCC option '-posix', as well as an indication as to
86 whether or not use of the FPU is allowed. */
90 "%(netbsd_cpp_spec) %(cpp_cpu_spec) %(cpp_fpu_spec)"
93 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets. We pass
94 on some CPU options, as well as PIC code generation options. */
98 "%(asm_default_spec) \
99 %{m68010} %{m68020} %{m68030} %{m68040} %{m68060} \
100 %{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
102 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
104 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target. */
107 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
109 #define NETBSD_ENTRY_POINT "_start"
111 /* Output assembler code to FILE to increment profiler label # LABELNO
112 for profiling a function only. */
114 #undef FUNCTION_PROFILER
115 #define FUNCTION_PROFILER(FILE, LABELNO) \
118 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
120 fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \
122 fprintf (FILE, "\tjbsr __mcount\n"); \
127 /* Make gcc agree with <machine/ansi.h> */
130 #define SIZE_TYPE "unsigned int"
133 #define PTRDIFF_TYPE "int"
137 Here is a bunch of stuff lifted from m68kelf.h. We don't use that
138 file directly, because it has a lot of baggage we don't want. */
141 /* The prefix for register names. Note that REGISTER_NAMES
142 is supposed to include this prefix. Also note that this is NOT an
143 fprintf format string, it is a literal string. */
145 #undef REGISTER_PREFIX
146 #define REGISTER_PREFIX "%"
149 /* The prefix for local (compiler generated) lables.
150 These labels will not appear in the symbol table. */
152 #undef LOCAL_LABEL_PREFIX
153 #define LOCAL_LABEL_PREFIX "."
156 /* The prefix to add to user-visible assembler symbols. */
158 #undef USER_LABEL_PREFIX
159 #define USER_LABEL_PREFIX ""
162 /* The prefix for immediate operands. */
164 #undef IMMEDIATE_PREFIX
165 #define IMMEDIATE_PREFIX "#"
168 #undef ASM_COMMENT_START
169 #define ASM_COMMENT_START "|"
172 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
173 keep switch tables in the text section. */
175 #undef JUMP_TABLES_IN_TEXT_SECTION
176 #define JUMP_TABLES_IN_TEXT_SECTION 1
179 /* Use the default action for outputting the case label. */
180 #undef ASM_OUTPUT_CASE_LABEL
181 #define ASM_RETURN_CASE_JUMP \
183 if (TARGET_COLDFIRE) \
185 if (ADDRESS_REG_P (operands[0])) \
186 return "jmp %%pc@(2,%0:l)"; \
188 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
191 return "jmp %%pc@(2,%0:w)"; \
195 /* This is how to output an assembler line that says to advance the
196 location counter to a multiple of 2**LOG bytes. */
198 #undef ASM_OUTPUT_ALIGN
199 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
203 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
208 /* If defined, a C expression whose value is a string containing the
209 assembler operation to identify the following data as uninitialized global
212 #define BSS_SECTION_ASM_OP ".section\t.bss"
215 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
216 separate, explicit argument. If you define this macro, it is used
217 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
218 handling the required alignment of the variable. The alignment is
219 specified as the number of bits.
221 Try to use function `asm_output_aligned_bss' defined in file
222 `varasm.c' when defining this macro. */
224 #undef ASM_OUTPUT_ALIGNED_BSS
225 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
226 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
229 #undef ASM_OUTPUT_COMMON
230 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
231 ( fputs (".comm ", (FILE)), \
232 assemble_name ((FILE), (NAME)), \
233 fprintf ((FILE), ",%u\n", (int)(SIZE)))
235 #undef ASM_OUTPUT_LOCAL
236 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
237 ( fputs (".lcomm ", (FILE)), \
238 assemble_name ((FILE), (NAME)), \
239 fprintf ((FILE), ",%u\n", (int)(SIZE)))
243 This is the end of the chunk lifted from m68kelf.h */
247 The following chunk is more or less lifted from m68kv4.h.
248 We'd like to just #include that file, but it has not yet
249 been converted to the new include style.
251 Should there be a m68kv4-abi.h ?? */
254 /* Register in which address to store a structure value is passed to a
255 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
257 #undef M68K_STRUCT_VALUE_REGNUM
258 #define M68K_STRUCT_VALUE_REGNUM 8
261 /* Register in which static-chain is passed to a function. The
262 default isn m68k.h is a0, but that is already the struct value
263 regnum. Make it a1 instead. */
265 #undef STATIC_CHAIN_REGNUM
266 #define STATIC_CHAIN_REGNUM 9
269 /* Now to renumber registers for dbx and gdb.
270 We use the Sun-3 convention, which is:
271 floating point registers have numbers 18 to 25, not
272 16 to 23 as they do in the compiler. */
274 #undef DBX_REGISTER_NUMBER
275 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
278 /* 1 if N is a possible register number for a function value. For
279 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
280 pointer, or floating types, respectively. Reject fp0 if not using
281 a 68881 coprocessor. */
283 #undef FUNCTION_VALUE_REGNO_P
284 #define FUNCTION_VALUE_REGNO_P(N) \
285 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
288 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
289 more than one register. */
291 #undef NEEDS_UNTYPED_CALL
292 #define NEEDS_UNTYPED_CALL 1
295 /* Define how to generate (in the callee) the output value of a
296 function and how to find (in the caller) the value returned by a
297 function. VALTYPE is the data type of the value (as a tree). If
298 the precise function being called is known, FUNC is its
299 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
300 result in d0, a0, or fp0 as appropriate. */
302 #undef FUNCTION_VALUE
303 #define FUNCTION_VALUE(VALTYPE, FUNC) \
304 m68k_function_value (VALTYPE, FUNC)
307 /* For compatibility with the large body of existing code which does
308 not always properly declare external functions returning pointer
309 types, the m68k/SVR4 convention is to copy the value returned for
310 pointer functions from a0 to d0 in the function epilogue, so that
311 callers that have neglected to properly declare the callee can
312 still find the correct return value. */
314 extern int current_function_returns_pointer;
315 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
318 if (current_function_returns_pointer \
319 && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
320 asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \
325 /* Define how to find the value returned by a library function
326 assuming the value has mode MODE.
327 For m68k/SVR4 look for integer values in d0, pointer values in d0
328 (returned in both d0 and a0), and floating values in fp0. */
331 #define LIBCALL_VALUE(MODE) \
332 m68k_libcall_value (MODE)
335 /* Boundary (in *bits*) on which stack pointer should be aligned.
336 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
338 #undef STACK_BOUNDARY
339 #define STACK_BOUNDARY 32
342 /* Alignment of field after `int : 0' in a structure.
343 For m68k/SVR4, this is the next longword boundary. */
345 #undef EMPTY_FIELD_BOUNDARY
346 #define EMPTY_FIELD_BOUNDARY 32
349 /* No data type wants to be aligned rounder than this.
350 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
353 #undef BIGGEST_ALIGNMENT
354 #define BIGGEST_ALIGNMENT 64
357 /* For m68k SVR4, structures are returned using the reentrant
360 #undef PCC_STATIC_STRUCT_RETURN
363 /* The svr4 ABI for the m68k says that records and unions are returned
366 #undef DEFAULT_PCC_STRUCT_RETURN
367 #define DEFAULT_PCC_STRUCT_RETURN 1
369 /* Output assembler code for a block containing the constant parts
370 of a trampoline, leaving space for the variable parts. */
372 /* On m68k svr4, the trampoline is different from the generic version
373 in that we use a1 as the static call chain. */
375 #undef TRAMPOLINE_TEMPLATE
376 #define TRAMPOLINE_TEMPLATE(FILE) \
378 assemble_aligned_integer (2, GEN_INT (0x227a)); \
379 assemble_aligned_integer (2, GEN_INT (8)); \
380 assemble_aligned_integer (2, GEN_INT (0x2f3a)); \
381 assemble_aligned_integer (2, GEN_INT (8)); \
382 assemble_aligned_integer (2, GEN_INT (0x4e75)); \
383 assemble_aligned_integer (4, const0_rtx); \
384 assemble_aligned_integer (4, const0_rtx); \
387 /* Redefine since we are using a different trampoline */
388 #undef TRAMPOLINE_SIZE
389 #define TRAMPOLINE_SIZE 18
391 /* Emit RTL insns to initialize the variable parts of a trampoline.
392 FNADDR is an RTX for the address of the function's pure code.
393 CXT is an RTX for the static chain value for the function. */
395 #undef INITIALIZE_TRAMPOLINE
396 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
398 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
399 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
404 This is the end of the chunk lifted from m68kv4.h */