1 /* Definitions of target machine for GNU compiler,
2 for m68k (including m68010) NetBSD platforms using the
4 Copyright (C) 2002, 2003, 2004, 2006, 2007 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 3, 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 COPYING3. If not see
24 <http://www.gnu.org/licenses/>. */
26 #define TARGET_OS_CPP_BUILTINS() \
29 NETBSD_OS_CPP_BUILTINS_ELF(); \
30 builtin_define ("__m68k__"); \
31 builtin_define ("__SVR4_ABI__"); \
32 builtin_define ("__motorola__"); \
33 if (TARGET_HARD_FLOAT) \
34 builtin_define ("__HAVE_FPU__"); \
38 /* Don't try using XFmode on the 68010. */
39 #undef LONG_DOUBLE_TYPE_SIZE
40 #define LONG_DOUBLE_TYPE_SIZE (TARGET_68020 ? 80 : 64)
42 #undef LIBGCC2_LONG_DOUBLE_TYPE_SIZE
44 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 64
46 #define LIBGCC2_LONG_DOUBLE_TYPE_SIZE 80
49 #undef SUBTARGET_EXTRA_SPECS
50 #define SUBTARGET_EXTRA_SPECS \
51 { "netbsd_entry_point", NETBSD_ENTRY_POINT },
55 #define TARGET_VERSION \
58 ? " (NetBSD/68010 ELF)" \
59 : " (NetBSD/m68k ELF)");
62 /* Provide a CPP_SPEC appropriate for NetBSD m68k targets. Currently we
63 deal with the GCC option '-posix', as well as an indication as to
64 whether or not use of the FPU is allowed. */
67 #define CPP_SPEC NETBSD_CPP_SPEC
70 /* Provide an ASM_SPEC appropriate for NetBSD m68k ELF targets. We need
71 to pass PIC code generation options. */
74 #define ASM_SPEC "%(asm_cpu_spec) %{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
76 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
78 /* Provide a LINK_SPEC appropriate for a NetBSD/m68k ELF target. */
81 #define LINK_SPEC NETBSD_LINK_SPEC_ELF
83 #define NETBSD_ENTRY_POINT "_start"
85 /* Output assembler code to FILE to increment profiler label # LABELNO
86 for profiling a function only. */
88 #undef FUNCTION_PROFILER
89 #define FUNCTION_PROFILER(FILE, LABELNO) \
92 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
94 fprintf (FILE, "\tbsr.l __mcount@PLTPC\n"); \
96 fprintf (FILE, "\tjbsr __mcount\n"); \
101 /* Make gcc agree with <machine/ansi.h> */
104 #define SIZE_TYPE "unsigned int"
107 #define PTRDIFF_TYPE "int"
111 Here is a bunch of stuff lifted from m68kelf.h. We don't use that
112 file directly, because it has a lot of baggage we don't want. */
115 /* The prefix for register names. Note that REGISTER_NAMES
116 is supposed to include this prefix. Also note that this is NOT an
117 fprintf format string, it is a literal string. */
119 #undef REGISTER_PREFIX
120 #define REGISTER_PREFIX "%"
123 /* The prefix for local (compiler generated) lables.
124 These labels will not appear in the symbol table. */
126 #undef LOCAL_LABEL_PREFIX
127 #define LOCAL_LABEL_PREFIX "."
130 /* The prefix to add to user-visible assembler symbols. */
132 #undef USER_LABEL_PREFIX
133 #define USER_LABEL_PREFIX ""
136 #undef ASM_COMMENT_START
137 #define ASM_COMMENT_START "|"
140 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
141 keep switch tables in the text section. */
143 #undef JUMP_TABLES_IN_TEXT_SECTION
144 #define JUMP_TABLES_IN_TEXT_SECTION 1
147 /* Use the default action for outputting the case label. */
148 #undef ASM_OUTPUT_CASE_LABEL
149 #define ASM_RETURN_CASE_JUMP \
151 if (TARGET_COLDFIRE) \
153 if (ADDRESS_REG_P (operands[0])) \
154 return "jmp %%pc@(2,%0:l)"; \
156 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
159 return "jmp %%pc@(2,%0:w)"; \
163 /* This is how to output an assembler line that says to advance the
164 location counter to a multiple of 2**LOG bytes. */
166 #undef ASM_OUTPUT_ALIGN
167 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
171 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG)); \
176 /* If defined, a C expression whose value is a string containing the
177 assembler operation to identify the following data as uninitialized global
180 #define BSS_SECTION_ASM_OP ".section\t.bss"
183 /* Like `ASM_OUTPUT_BSS' except takes the required alignment as a
184 separate, explicit argument. If you define this macro, it is used
185 in place of `ASM_OUTPUT_BSS', and gives you more flexibility in
186 handling the required alignment of the variable. The alignment is
187 specified as the number of bits.
189 Try to use function `asm_output_aligned_bss' defined in file
190 `varasm.c' when defining this macro. */
192 #undef ASM_OUTPUT_ALIGNED_BSS
193 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
194 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
197 #undef ASM_OUTPUT_COMMON
198 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
199 ( fputs (".comm ", (FILE)), \
200 assemble_name ((FILE), (NAME)), \
201 fprintf ((FILE), ",%u\n", (int)(SIZE)))
203 #undef ASM_OUTPUT_LOCAL
204 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
205 ( fputs (".lcomm ", (FILE)), \
206 assemble_name ((FILE), (NAME)), \
207 fprintf ((FILE), ",%u\n", (int)(SIZE)))
211 This is the end of the chunk lifted from m68kelf.h */
215 The following chunk is more or less lifted from m68kv4.h.
216 We'd like to just #include that file, but it has not yet
217 been converted to the new include style.
219 Should there be a m68kv4-abi.h ?? */
222 /* Register in which address to store a structure value is passed to a
223 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
225 #undef M68K_STRUCT_VALUE_REGNUM
226 #define M68K_STRUCT_VALUE_REGNUM A0_REG
229 /* Register in which static-chain is passed to a function. The
230 default isn m68k.h is a0, but that is already the struct value
231 regnum. Make it a1 instead. */
233 #undef STATIC_CHAIN_REGNUM
234 #define STATIC_CHAIN_REGNUM A1_REG
235 #undef M68K_STATIC_CHAIN_REG_NAME
236 #define M68K_STATIC_CHAIN_REG_NAME REGISTER_PREFIX "a1"
239 /* Now to renumber registers for dbx and gdb.
240 We use the Sun-3 convention, which is:
241 floating point registers have numbers 18 to 25, not
242 16 to 23 as they do in the compiler. */
244 #undef DBX_REGISTER_NUMBER
245 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
248 /* 1 if N is a possible register number for a function value. For
249 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
250 pointer, or floating types, respectively. Reject fp0 if not using
251 a 68881 coprocessor. */
253 #undef FUNCTION_VALUE_REGNO_P
254 #define FUNCTION_VALUE_REGNO_P(N) \
255 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
258 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
259 more than one register. */
261 #undef NEEDS_UNTYPED_CALL
262 #define NEEDS_UNTYPED_CALL 1
265 /* Define how to generate (in the callee) the output value of a
266 function and how to find (in the caller) the value returned by a
267 function. VALTYPE is the data type of the value (as a tree). If
268 the precise function being called is known, FUNC is its
269 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
270 result in d0, a0, or fp0 as appropriate. */
272 #undef FUNCTION_VALUE
273 #define FUNCTION_VALUE(VALTYPE, FUNC) \
274 m68k_function_value (VALTYPE, FUNC)
277 /* Define how to find the value returned by a library function
278 assuming the value has mode MODE.
279 For m68k/SVR4 look for integer values in d0, pointer values in d0
280 (returned in both d0 and a0), and floating values in fp0. */
283 #define LIBCALL_VALUE(MODE) \
284 m68k_libcall_value (MODE)
287 /* Boundary (in *bits*) on which stack pointer should be aligned.
288 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
290 #undef STACK_BOUNDARY
291 #define STACK_BOUNDARY 32
294 /* Alignment of field after `int : 0' in a structure.
295 For m68k/SVR4, this is the next longword boundary. */
297 #undef EMPTY_FIELD_BOUNDARY
298 #define EMPTY_FIELD_BOUNDARY 32
301 /* No data type wants to be aligned rounder than this.
302 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
305 #undef BIGGEST_ALIGNMENT
306 #define BIGGEST_ALIGNMENT 64
309 /* The svr4 ABI for the m68k says that records and unions are returned
312 #undef DEFAULT_PCC_STRUCT_RETURN
313 #define DEFAULT_PCC_STRUCT_RETURN 1
315 /* Output assembler code for a block containing the constant parts
316 of a trampoline, leaving space for the variable parts. */
318 /* On m68k svr4, the trampoline is different from the generic version
319 in that we use a1 as the static call chain. */
321 #undef TRAMPOLINE_TEMPLATE
322 #define TRAMPOLINE_TEMPLATE(FILE) \
324 assemble_aligned_integer (2, GEN_INT (0x227a)); \
325 assemble_aligned_integer (2, GEN_INT (8)); \
326 assemble_aligned_integer (2, GEN_INT (0x2f3a)); \
327 assemble_aligned_integer (2, GEN_INT (8)); \
328 assemble_aligned_integer (2, GEN_INT (0x4e75)); \
329 assemble_aligned_integer (4, const0_rtx); \
330 assemble_aligned_integer (4, const0_rtx); \
333 /* Redefine since we are using a different trampoline */
334 #undef TRAMPOLINE_SIZE
335 #define TRAMPOLINE_SIZE 18
337 /* Emit RTL insns to initialize the variable parts of a trampoline.
338 FNADDR is an RTX for the address of the function's pure code.
339 CXT is an RTX for the static chain value for the function. */
341 #undef INITIALIZE_TRAMPOLINE
342 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
344 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
345 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \
350 This is the end of the chunk lifted from m68kv4.h */