1 /* Definitions for Motorola 68k running Linux with ELF format.
2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 1, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #define LINUX_DEFAULT_ELF
22 #define MOTOROLA /* Use Motorola syntax */
23 #define USE_GAS /* But GAS wants jbsr instead of jsr */
25 #include <m68k/m68k.h>
26 #include <linux.h> /* some common stuff */
29 #define TARGET_VERSION fprintf (stderr, " (68k Linux/ELF)");
31 /* 68020 with 68881 */
32 #define TARGET_DEFAULT 7
34 /* for 68k machines this only needs to be TRUE for the 68000 */
36 #undef STRICT_ALIGNMENT
37 #define STRICT_ALIGNMENT 0
39 #undef SUBTARGET_SWITCHES
40 #define SUBTARGET_SWITCHES {"ieee-fp", 0},
42 /* Here are four prefixes that are used by asm_fprintf to
43 facilitate customization for alternate assembler syntaxes.
44 Machines with no likelihood of an alternate syntax need not
45 define these and need not use asm_fprintf. */
47 /* The prefix for register names. Note that REGISTER_NAMES
48 is supposed to include this prefix. Also note that this is NOT an
49 fprintf format string, it is a literal string */
51 #undef REGISTER_PREFIX
52 #define REGISTER_PREFIX "%"
54 /* The prefix for local (compiler generated) labels.
55 These labels will not appear in the symbol table. */
57 #undef LOCAL_LABEL_PREFIX
58 #define LOCAL_LABEL_PREFIX "."
60 /* The prefix to add to user-visible assembler symbols. */
62 #undef USER_LABEL_PREFIX
63 #define USER_LABEL_PREFIX ""
65 /* How to refer to registers in assembler output.
66 This sequence is indexed by compiler's hard-register-number.
67 Motorola format uses different register names than defined in m68k.h. */
71 #ifndef SUPPORT_SUN_FPA
73 #define REGISTER_NAMES \
74 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
75 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
76 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
78 #else /* SUPPORTED_SUN_FPA */
80 #define REGISTER_NAMES \
81 {"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7", \
82 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp", \
83 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \
84 "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \
85 "%fpa8", "%fpa9", "%fpa10","%fpa11","%fpa12","%fpa13","%fpa14","%fpa15", \
86 "%fpa16","%fpa17","%fpa18","%fpa19","%fpa20","%fpa21","%fpa22","%fpa23", \
87 "%fpa24","%fpa25","%fpa26","%fpa27","%fpa28","%fpa29","%fpa30","%fpa31" }
89 #endif /* defined SUPPORT_SUN_FPA */
92 #define SIZE_TYPE "unsigned int"
95 #define PTRDIFF_TYPE "int"
98 #define WCHAR_TYPE "long int"
100 #undef WCHAR_TYPE_SIZE
101 #define WCHAR_TYPE_SIZE BITS_PER_WORD
103 #define CPP_PREDEFINES \
104 "-D__ELF__ -Dunix -Dmc68000 -Dmc68020 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(m68k) -Amachine(m68k)"
107 #if TARGET_DEFAULT & 2
109 "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
112 "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
115 /* Provide a LINK_SPEC appropriate for Linux. Here we provide support
116 for the special GCC options -static and -shared, which allow us to
117 link things in one of these three modes by applying the appropriate
118 combinations of options at link-time. We like to support here for
119 as many of the other GNU linker options as possible. But I don't
120 have the time to search for those flags. I am sure how to add
121 support for -soname shared_object_name. H.J.
123 I took out %{v:%{!V:-V}}. It is too much :-(. They can use
126 When the -shared link option is used a final link is not being
129 /* If ELF is the default format, we should not use /lib/elf. */
132 #ifndef LINUX_DEFAULT_ELF
133 #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
134 %{!shared:%{!symbolic: \
136 %{rdynamic:-export-dynamic} \
137 %{!dynamic-linker*:-dynamic-linker /lib/elf/ld-linux.so.1} \
138 %{!rpath*:-rpath /lib/elf/}} %{static}}}"
140 #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
141 %{!shared:%{!symbolic: \
143 %{rdynamic:-export-dynamic} \
144 %{!dynamic-linker*:-dynamic-linker /lib/ld-linux.so.1}} \
148 /* For compatibility with linux/a.out */
150 #undef PCC_BITFIELD_TYPE_MATTERS
152 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
153 keep switch tables in the text section. */
155 #define JUMP_TABLES_IN_TEXT_SECTION 1
157 /* Use the default action for outputting the case label. */
158 #undef ASM_OUTPUT_CASE_LABEL
160 #define ASM_RETURN_CASE_JUMP \
161 return "jmp (2,%%pc,%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) \
169 fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG));
171 /* If defined, a C expression whose value is a string containing the
172 assembler operation to identify the following data as uninitialized global
175 #define BSS_SECTION_ASM_OP ".section\t.bss"
177 /* A C statement (sans semicolon) to output to the stdio stream
178 FILE the assembler definition of an uninitialized global label named
179 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
180 Try to use asm_output_aligned_bss to implement this macro. */
182 #define ASM_OUTPUT_ALIGNED_BSS(FILE, NAME, SIZE, ALIGN) \
183 asm_output_aligned_bss (FILE, NAME, SIZE, ALIGN)
185 /* Output assembler code to FILE to increment profiler label # LABELNO
186 for profiling a function entry. */
188 #undef FUNCTION_PROFILER
189 #define FUNCTION_PROFILER(FILE, LABELNO) \
191 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
193 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
195 fprintf (FILE, "\tjbsr _mcount\n"); \
198 /* Register in which address to store a structure value is passed to a
199 function. The default in m68k.h is a1. For m68k/SVR4 it is a0. */
201 #undef STRUCT_VALUE_REGNUM
202 #define STRUCT_VALUE_REGNUM 8
204 /* Register in which static-chain is passed to a function. The
205 default in m68k.h is a0, but that is already the struct value
206 regnum. Make it a1 instead. */
208 #undef STATIC_CHAIN_REGNUM
209 #define STATIC_CHAIN_REGNUM 9
211 /* How to renumber registers for dbx and gdb.
212 On the Sun-3, the floating point registers have numbers
213 18 to 25, not 16 to 23 as they do in the compiler. */
215 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
217 /* Do not break .stabs pseudos into continuations. */
219 #define DBX_CONTIN_LENGTH 0
221 /* Allow folding division by zero. */
222 #define REAL_INFINITY
224 /* 1 if N is a possible register number for a function value. For
225 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
226 pointer, or floating types, respectively. Reject fp0 if not using
227 a 68881 coprocessor. */
229 #undef FUNCTION_VALUE_REGNO_P
230 #define FUNCTION_VALUE_REGNO_P(N) \
231 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
233 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
234 more than one register. */
236 #undef NEEDS_UNTYPED_CALL
237 #define NEEDS_UNTYPED_CALL 1
239 /* Define how to generate (in the callee) the output value of a
240 function and how to find (in the caller) the value returned by a
241 function. VALTYPE is the data type of the value (as a tree). If
242 the precise function being called is known, FUNC is its
243 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
244 result in d0, a0, or fp0 as appropriate. */
246 #undef FUNCTION_VALUE
247 #define FUNCTION_VALUE(VALTYPE, FUNC) \
248 (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \
249 ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16) \
250 : (POINTER_TYPE_P (VALTYPE) \
251 ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8) \
252 : gen_rtx (REG, TYPE_MODE (VALTYPE), 0)))
254 /* For compatibility with the large body of existing code which does
255 not always properly declare external functions returning pointer
256 types, the m68k/SVR4 convention is to copy the value returned for
257 pointer functions from a0 to d0 in the function epilogue, so that
258 callers that have neglected to properly declare the callee can
259 still find the correct return value. */
261 extern int current_function_returns_pointer;
262 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
264 if ((current_function_returns_pointer) && \
265 ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
266 asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \
269 /* Define how to find the value returned by a library function
270 assuming the value has mode MODE.
271 For m68k/SVR4 look for integer values in d0, pointer values in d0
272 (returned in both d0 and a0), and floating values in fp0. */
275 #define LIBCALL_VALUE(MODE) \
276 ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode) \
278 ? gen_rtx (REG, (MODE), 16) \
279 : gen_rtx (REG, (MODE), 0))
281 /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is
282 an operand of a function call. */
283 #undef LEGITIMATE_PIC_OPERAND_P
284 #define LEGITIMATE_PIC_OPERAND_P(X) \
285 ((! symbolic_operand (X, VOIDmode) \
286 && ! (GET_CODE (X) == CONST_DOUBLE && CONST_DOUBLE_MEM (X) \
287 && GET_CODE (CONST_DOUBLE_MEM (X)) == MEM \
288 && symbolic_operand (XEXP (CONST_DOUBLE_MEM (X), 0), VOIDmode))) \
289 || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)))
291 /* Turn off function cse if we are doing PIC. We always want function
292 call to be done as `bsr foo@PLTPC', so it will force the assembler
293 to create the PLT entry for `foo'. Doing function cse will cause
294 the address of `foo' to be loaded into a register, which is exactly
295 what we want to avoid when we are doing PIC on svr4 m68k. */
296 #undef SUBTARGET_OVERRIDE_OPTIONS
297 #define SUBTARGET_OVERRIDE_OPTIONS \
298 if (flag_pic) flag_no_function_cse = 1;
300 /* For m68k SVR4, structures are returned using the reentrant
302 #undef PCC_STATIC_STRUCT_RETURN
303 #define DEFAULT_PCC_STRUCT_RETURN 0
305 /* Output assembler code for a block containing the constant parts
306 of a trampoline, leaving space for the variable parts. */
308 /* On m68k svr4, the trampoline is different from the generic version
309 in that we use a1 as the static call chain. */
311 #undef TRAMPOLINE_TEMPLATE
312 #define TRAMPOLINE_TEMPLATE(FILE) \
314 ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x227a)); \
315 ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 8)); \
316 ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x2f3a)); \
317 ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 8)); \
318 ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x4e75)); \
319 ASM_OUTPUT_INT (FILE, const0_rtx); \
320 ASM_OUTPUT_INT (FILE, const0_rtx); \
323 /* Redefine since we are using a different trampoline */
324 #undef TRAMPOLINE_SIZE
325 #define TRAMPOLINE_SIZE 18
327 /* Emit RTL insns to initialize the variable parts of a trampoline.
328 FNADDR is an RTX for the address of the function's pure code.
329 CXT is an RTX for the static chain value for the function. */
331 #undef INITIALIZE_TRAMPOLINE
332 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
334 emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 10)), CXT); \
335 emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 14)), FNADDR); \