1 /* Target definitions for GNU compiler for mc680x0 running System V.4
2 Copyright (C) 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000
3 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@monkeys.com) and
5 Fred Fish (fnf@cygnus.com).
7 This file is part of GNU CC.
9 GNU CC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GNU CC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GNU CC; see the file COPYING. If not, write to
21 the Free Software Foundation, 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
24 /* Use SGS_* macros to control compilation in m68k.md */
26 #define SGS_SWITCH_TABLES /* Different switch table handling */
28 /* TODO: convert includes to ${tm_file} list in config.gcc. */
29 #include "m68k/sgs.h" /* The m68k/SVR4 assembler is SGS based */
32 #include "svr4.h" /* Pick up the generic SVR4 macros */
34 /* See m68k.h. 7 means 68020 with 68881. */
36 #ifndef TARGET_DEFAULT
37 #define TARGET_DEFAULT (MASK_BITFIELD|MASK_68881|MASK_68020)
40 /* Override the definition of NO_DOLLAR_IN_LABEL in svr4.h, for special
41 g++ assembler names. When this is defined, g++ uses embedded '.'
42 characters and some m68k assemblers have problems with this. The
43 chances are much greater that any particular assembler will permit
44 embedded '$' characters. */
46 #undef NO_DOLLAR_IN_LABEL
48 /* Define PCC_STATIC_STRUCT_RETURN if the convention on the target machine
49 is to use the nonreentrant technique for returning structure and union
50 values, as commonly implemented by the AT&T Portable C Compiler (PCC).
51 When defined, the gcc option -fpcc-struct-return can be used to cause
52 this form to be generated. When undefined, the option does nothing.
53 For m68k SVR4, the convention is to use a reentrant technique compatible
54 with the gcc default, so override the definition of this macro in m68k.h */
56 #undef PCC_STATIC_STRUCT_RETURN
58 /* Provide a set of pre-definitions and pre-assertions appropriate for
59 the m68k running svr4. __svr4__ is our extension. */
61 #define CPP_PREDEFINES \
62 "-Dm68k -Dunix -D__svr4__ -D__motorola__ \
63 -Asystem=unix -Asystem=svr4 -Acpu=m68k -Amachine=m68k"
65 /* Test to see if the target includes a 68881 by default, and use CPP_SPEC
66 to control whether or not __HAVE_68881__ is defined by default or not.
67 If a 68881 is the default, gcc will use inline 68881 instructions, by
68 predefining __HAVE_68881__, unless -msoft-float is specified.
69 If a 68881 is not the default, gcc will only define __HAVE_68881__ if
70 -m68881 is specified. */
72 #if TARGET_DEFAULT & MASK_68881
73 #define CPP_SPEC "%{!msoft-float:-D__HAVE_68881__}"
75 #define CPP_SPEC "%{m68881:-D__HAVE_68881__}"
78 /* Output assembler code to FILE to increment profiler label # LABELNO
79 for profiling a function entry. We override the definition in m68k.h
80 and match the way the native m68k/SVR4 compiler does profiling, with the
81 address of the profile counter in a1, not a0, and using bsr rather
84 #undef FUNCTION_PROFILER
85 #define FUNCTION_PROFILER(FILE, LABELNO) \
86 asm_fprintf ((FILE), "\tlea.l\t(%LLP%d,%Rpc),%Ra1\n\tbsr\t_mcount\n", \
89 /* Local common symbols are declared to the assembler with ".lcomm" rather
90 than ".bss", so override the definition in svr4.h */
91 /* ??? svr4.h no longer defines this, and this is only used by m68k/amix.h. */
94 #define BSS_ASM_OP "\t.lcomm\t"
96 /* Register in which address to store a structure value is passed to a
97 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
99 #undef STRUCT_VALUE_REGNUM
100 #define STRUCT_VALUE_REGNUM 8
102 /* Register in which static-chain is passed to a function. The
103 default in m68k.h is a0, but that is already the struct value
104 regnum. Make it a1 instead. */
106 #undef STATIC_CHAIN_REGNUM
107 #define STATIC_CHAIN_REGNUM 9
109 #define ASM_COMMENT_START "#"
111 #undef TYPE_OPERAND_FMT
112 #define TYPE_OPERAND_FMT "@%s"
114 /* Define how the m68k registers should be numbered for Dwarf output.
115 The numbering provided here should be compatible with the native
116 SVR4 SDB debugger in the m68k/SVR4 reference port, where d0-d7
117 are 0-7, a0-a8 are 8-15, and fp0-fp7 are 16-23. */
119 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
121 /* The ASM_OUTPUT_SKIP macro is first defined in m68k.h, using ".skip".
122 It is then overridden by m68k/sgs.h to use ".space", and again by svr4.h
123 to use ".zero". The m68k/SVR4 assembler uses ".space", so repeat the
124 definition from m68k/sgs.h here. Note that ASM_NO_SKIP_IN_TEXT is
125 defined in m68k/sgs.h, so we don't have to repeat it here. */
127 #undef ASM_OUTPUT_SKIP
128 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
129 fprintf (FILE, "%s%u\n", SPACE_ASM_OP, (SIZE))
131 /* 1 if N is a possible register number for a function value.
132 For m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
133 pointer, or floating types, respectively. Reject fp0 if not using a
134 68881 coprocessor. */
136 #undef FUNCTION_VALUE_REGNO_P
137 #define FUNCTION_VALUE_REGNO_P(N) \
138 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
140 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
141 more than one register. */
143 #undef NEEDS_UNTYPED_CALL
144 #define NEEDS_UNTYPED_CALL 1
146 /* Define how to generate (in the callee) the output value of a function
147 and how to find (in the caller) the value returned by a function. VALTYPE
148 is the data type of the value (as a tree). If the precise function being
149 called is known, FUNC is its FUNCTION_DECL; otherwise, FUNC is 0.
150 For m68k/SVR4 generate the result in d0, a0, or fp0 as appropriate. */
152 #undef FUNCTION_VALUE
153 #define FUNCTION_VALUE(VALTYPE, FUNC) \
154 (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \
155 ? gen_rtx_REG (TYPE_MODE (VALTYPE), 16) \
156 : (POINTER_TYPE_P (VALTYPE) \
157 ? gen_rtx_REG (TYPE_MODE (VALTYPE), 8) \
158 : gen_rtx_REG (TYPE_MODE (VALTYPE), 0)))
160 /* For compatibility with the large body of existing code which does not
161 always properly declare external functions returning pointer types, the
162 m68k/SVR4 convention is to copy the value returned for pointer functions
163 from a0 to d0 in the function epilogue, so that callers that have
164 neglected to properly declare the callee can still find the correct return
167 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
169 if (current_function_returns_pointer \
170 && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
171 asm_fprintf (FILE, "\tmov.l %Ra0,%Rd0\n"); \
174 /* Define how to find the value returned by a library function assuming the
176 For m68k/SVR4 look for integer values in d0, pointer values in d0
177 (returned in both d0 and a0), and floating values in fp0. */
180 #define LIBCALL_VALUE(MODE) \
181 ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode) \
183 ? gen_rtx_REG ((MODE), 16) \
184 : gen_rtx_REG ((MODE), 0))
186 /* Boundary (in *bits*) on which stack pointer should be aligned.
187 The m68k/SVR4 convention is to keep the stack pointer longword aligned. */
189 #undef STACK_BOUNDARY
190 #define STACK_BOUNDARY 32
192 /* Alignment of field after `int : 0' in a structure.
193 For m68k/SVR4, this is the next longword boundary. */
195 #undef EMPTY_FIELD_BOUNDARY
196 #define EMPTY_FIELD_BOUNDARY 32
198 /* No data type wants to be aligned rounder than this.
199 For m68k/SVR4, some types (doubles for example) are aligned on 8 byte
202 #undef BIGGEST_ALIGNMENT
203 #define BIGGEST_ALIGNMENT 64
205 /* SVR4 m68k assembler is bitching on the `comm i,1,1' which asks for
206 1 byte alignment. Don't generate alignment for COMMON seems to be
207 safer until we the assembler is fixed. */
208 #undef ASM_OUTPUT_ALIGNED_COMMON
209 /* Same problem with this one. */
210 #undef ASM_OUTPUT_ALIGNED_LOCAL
212 /* The `string' directive on m68k svr4 does not handle string with
213 escape char (ie., `\') right. Use normal way to output ASCII bytes
214 seems to be safer. */
215 #undef ASM_OUTPUT_ASCII
216 #define ASM_OUTPUT_ASCII(FILE,PTR,LEN) \
218 register int sp = 0, ch; \
219 fprintf ((FILE), "%s", BYTE_ASM_OP); \
222 if (ch > ' ' && ! (ch & 0x80) && ch != '\\') \
224 fprintf ((FILE), "'%c", ch); \
228 fprintf ((FILE), "0x%x", ch); \
232 if ((sp % 10) == 0) \
234 fprintf ((FILE), "\n%s", BYTE_ASM_OP); \
238 putc (',', (FILE)); \
241 } while (sp < (LEN)); \
242 putc ('\n', (FILE)); \
245 /* SVR4 m68k assembler is bitching on the syntax `2.b'.
246 So use the "LLDnnn-LLnnn" format. Define LLDnnn after the table. */
248 #undef ASM_OUTPUT_CASE_END
249 #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
251 if (switch_table_difference_label_flag) \
252 asm_fprintf ((FILE), "%s%LLD%d,%LL%d\n", SET_ASM_OP, (NUM), (NUM)); \
253 switch_table_difference_label_flag = 0; \
256 int switch_table_difference_label_flag;
258 #undef ASM_OUTPUT_COMMON
259 #undef ASM_OUTPUT_LOCAL
260 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
261 ( fputs (".comm ", (FILE)), \
262 assemble_name ((FILE), (NAME)), \
263 fprintf ((FILE), ",%u\n", (SIZE)))
265 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
266 ( fputs (".lcomm ", (FILE)), \
267 assemble_name ((FILE), (NAME)), \
268 fprintf ((FILE), ",%u\n", (SIZE)))
270 /* Override the definition in svr4.h. In m68k svr4, using swbeg is the
271 standard way to do switch table. */
272 #undef ASM_OUTPUT_BEFORE_CASE_LABEL
273 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
274 fprintf ((FILE), "%s&%d\n", SWBEG_ASM_OP, XVECLEN (PATTERN (TABLE), 1));
276 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is an
277 operand of a function call. */
278 #undef LEGITIMATE_PIC_OPERAND_P
279 #define LEGITIMATE_PIC_OPERAND_P(X) \
280 ((! symbolic_operand (X, VOIDmode) \
281 && ! (GET_CODE (X) == CONST_DOUBLE && mem_for_const_double (X) != 0 \
282 && GET_CODE (mem_for_const_double (X)) == MEM \
283 && symbolic_operand (XEXP (mem_for_const_double (X), 0), \
285 || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)) \
286 || PCREL_GENERAL_OPERAND_OK)
288 /* Turn off function cse if we are doing PIC. We always want function call
289 to be done as `bsr foo@PLTPC', so it will force the assembler to create
290 the PLT entry for `foo'. Doing function cse will cause the address of `foo'
291 to be loaded into a register, which is exactly what we want to avoid when
292 we are doing PIC on svr4 m68k. */
293 #undef OVERRIDE_OPTIONS
294 #define OVERRIDE_OPTIONS \
296 if (flag_pic) flag_no_function_cse = 1; \
297 if (! TARGET_68020 && flag_pic == 2) \
298 error("-fPIC is not currently supported on the 68000 or 68010\n"); \
301 /* Output assembler code for a block containing the constant parts
302 of a trampoline, leaving space for the variable parts. */
304 /* On m68k svr4, the trampoline is different from the generic version
305 in that we use a1 as the static call chain. */
307 #undef TRAMPOLINE_TEMPLATE
308 #define TRAMPOLINE_TEMPLATE(FILE) \
310 ASM_OUTPUT_SHORT (FILE, GEN_INT (0x227a)); \
311 ASM_OUTPUT_SHORT (FILE, GEN_INT (8)); \
312 ASM_OUTPUT_SHORT (FILE, GEN_INT (0x2f3a)); \
313 ASM_OUTPUT_SHORT (FILE, GEN_INT (8)); \
314 ASM_OUTPUT_SHORT (FILE, GEN_INT (0x4e75)); \
315 ASM_OUTPUT_INT (FILE, const0_rtx); \
316 ASM_OUTPUT_INT (FILE, const0_rtx); \
319 /* Redefine since we are using a different trampoline */
320 #undef TRAMPOLINE_SIZE
321 #define TRAMPOLINE_SIZE 18
323 /* Emit RTL insns to initialize the variable parts of a trampoline.
324 FNADDR is an RTX for the address of the function's pure code.
325 CXT is an RTX for the static chain value for the function. */
327 #undef INITIALIZE_TRAMPOLINE
328 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
330 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 10)), CXT); \
331 emit_move_insn (gen_rtx_MEM (SImode, plus_constant (TRAMP, 14)), FNADDR); \