1 /* Definitions for Motorola 68k running Linux-based GNU systems with
3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2006
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 #define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)");
26 /* Add %(asm_cpu_spec) to the svr4.h definition of ASM_SPEC. */
29 "%(asm_cpu_spec) %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*}"
31 /* for 68k machines this only needs to be TRUE for the 68000 */
33 #undef STRICT_ALIGNMENT
34 #define STRICT_ALIGNMENT 0
36 /* Here are four prefixes that are used by asm_fprintf to
37 facilitate customization for alternate assembler syntaxes.
38 Machines with no likelihood of an alternate syntax need not
39 define these and need not use asm_fprintf. */
41 /* The prefix for register names. Note that REGISTER_NAMES
42 is supposed to include this prefix. Also note that this is NOT an
43 fprintf format string, it is a literal string */
45 #undef REGISTER_PREFIX
46 #define REGISTER_PREFIX "%"
48 /* The prefix for local (compiler generated) labels.
49 These labels will not appear in the symbol table. */
51 #undef LOCAL_LABEL_PREFIX
52 #define LOCAL_LABEL_PREFIX "."
54 /* The prefix to add to user-visible assembler symbols. */
56 #undef USER_LABEL_PREFIX
57 #define USER_LABEL_PREFIX ""
59 #define ASM_COMMENT_START "|"
62 #define SIZE_TYPE "unsigned int"
65 #define PTRDIFF_TYPE "int"
68 #define WCHAR_TYPE "long int"
70 #undef WCHAR_TYPE_SIZE
71 #define WCHAR_TYPE_SIZE BITS_PER_WORD
73 /* Target OS builtins. */
74 #define TARGET_OS_CPP_BUILTINS() \
77 LINUX_TARGET_OS_CPP_BUILTINS(); \
78 builtin_define_std ("mc68000"); \
79 builtin_define_std ("mc68020"); \
83 #define TARGET_OBJFMT_CPP_BUILTINS() \
86 builtin_define ("__ELF__"); \
91 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
93 /* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support
94 for the special GCC options -static and -shared, which allow us to
95 link things in one of these three modes by applying the appropriate
96 combinations of options at link-time. We like to support here for
97 as many of the other GNU linker options as possible. But I don't
98 have the time to search for those flags. I am sure how to add
99 support for -soname shared_object_name. H.J.
101 I took out %{v:%{!V:-V}}. It is too much :-(. They can use
104 When the -shared link option is used a final link is not being
107 /* If ELF is the default format, we should not use /lib/elf. */
109 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
112 #define LINK_SPEC "-m m68kelf %{shared} \
115 %{rdynamic:-export-dynamic} \
116 %{!dynamic-linker*:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \
119 /* For compatibility with linux/a.out */
121 #undef PCC_BITFIELD_TYPE_MATTERS
123 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
124 keep switch tables in the text section. */
126 #define JUMP_TABLES_IN_TEXT_SECTION 1
128 /* Use the default action for outputting the case label. */
129 #undef ASM_OUTPUT_CASE_LABEL
130 #define ASM_RETURN_CASE_JUMP \
132 if (TARGET_COLDFIRE) \
134 if (ADDRESS_REG_P (operands[0])) \
135 return "jmp %%pc@(2,%0:l)"; \
137 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
140 return "jmp %%pc@(2,%0:w)"; \
143 /* This is how to output an assembler line that says to advance the
144 location counter to a multiple of 2**LOG bytes. */
146 #undef ASM_OUTPUT_ALIGN
147 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
149 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));
151 /* If defined, a C expression whose value is a string containing the
152 assembler operation to identify the following data as uninitialized global
155 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
157 /* A C statement (sans semicolon) to output to the stdio stream
158 FILE the assembler definition of uninitialized global DECL named
159 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
160 Try to use asm_output_aligned_bss to implement this macro. */
162 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
163 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
165 /* Output assembler code to FILE to increment profiler label # LABELNO
166 for profiling a function entry. */
168 #undef FUNCTION_PROFILER
169 #define FUNCTION_PROFILER(FILE, LABELNO) \
171 asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
173 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
175 fprintf (FILE, "\tjbsr _mcount\n"); \
178 /* How to renumber registers for dbx and gdb.
179 On the Sun-3, the floating point registers have numbers
180 18 to 25, not 16 to 23 as they do in the compiler. */
182 #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
184 /* Do not break .stabs pseudos into continuations. */
186 #define DBX_CONTIN_LENGTH 0
188 /* 1 if N is a possible register number for a function value. For
189 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
190 pointer, or floating types, respectively. Reject fp0 if not using
191 a 68881 coprocessor. */
193 #undef FUNCTION_VALUE_REGNO_P
194 #define FUNCTION_VALUE_REGNO_P(N) \
195 ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
197 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
198 more than one register. */
200 #undef NEEDS_UNTYPED_CALL
201 #define NEEDS_UNTYPED_CALL 1
203 /* Define how to generate (in the callee) the output value of a
204 function and how to find (in the caller) the value returned by a
205 function. VALTYPE is the data type of the value (as a tree). If
206 the precise function being called is known, FUNC is its
207 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
208 result in d0, a0, or fp0 as appropriate. */
210 #undef FUNCTION_VALUE
211 #define FUNCTION_VALUE(VALTYPE, FUNC) \
212 m68k_function_value (VALTYPE, FUNC)
214 /* For compatibility with the large body of existing code which does
215 not always properly declare external functions returning pointer
216 types, the m68k/SVR4 convention is to copy the value returned for
217 pointer functions from a0 to d0 in the function epilogue, so that
218 callers that have neglected to properly declare the callee can
219 still find the correct return value. */
221 #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
223 if (current_function_returns_pointer \
224 && ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
225 asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \
228 /* Define how to find the value returned by a library function
229 assuming the value has mode MODE.
230 For m68k/SVR4 look for integer values in d0, pointer values in d0
231 (returned in both d0 and a0), and floating values in fp0. */
234 #define LIBCALL_VALUE(MODE) \
235 m68k_libcall_value (MODE)
237 /* For m68k SVR4, structures are returned using the reentrant
239 #undef PCC_STATIC_STRUCT_RETURN
240 #define DEFAULT_PCC_STRUCT_RETURN 0
242 /* Finalize the trampoline by flushing the insn cache. */
244 #undef FINALIZE_TRAMPOLINE
245 #define FINALIZE_TRAMPOLINE(TRAMP) \
246 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \
247 0, VOIDmode, 2, TRAMP, Pmode, \
248 plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);
250 /* Clear the instruction cache from `beg' to `end'. This makes an
251 inline system call to SYS_cacheflush. The arguments are as
254 cacheflush (addr, scope, cache, len)
256 addr - the start address for the flush
257 scope - the scope of the flush (see the cpush insn)
258 cache - which cache to flush (see the cpush insn)
259 len - a factor relating to the number of flushes to perform:
260 len/16 lines, or len/4096 pages. */
262 #define CLEAR_INSN_CACHE(BEG, END) \
264 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
265 unsigned long _end = (unsigned long) (END); \
266 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
268 ("move%.l #123, %/d0\n\t" /* system call nr */ \
269 "move%.l #1, %/d2\n\t" /* clear lines */ \
270 "move%.l #3, %/d3\n\t" /* insn+data caches */ \
273 : "d" (_beg), "d" (_len) \
274 : "%d0", "%d2", "%d3"); \
277 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack