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 2007, 2009 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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 #define TARGET_VERSION fprintf (stderr, " (68k GNU/Linux with ELF)");
25 /* Add %(asm_cpu_spec) to the svr4.h definition of ASM_SPEC. */
27 #define ASM_SPEC "%(asm_cpu_spec) %(asm_pcrel_spec) \
28 %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*}"
30 #undef PREFERRED_STACK_BOUNDARY
31 #define PREFERRED_STACK_BOUNDARY 32
33 /* for 68k machines this only needs to be TRUE for the 68000 */
35 #undef STRICT_ALIGNMENT
36 #define STRICT_ALIGNMENT 0
37 #undef M68K_HONOR_TARGET_STRICT_ALIGNMENT
38 #define M68K_HONOR_TARGET_STRICT_ALIGNMENT 0
40 /* Here are four prefixes that are used by asm_fprintf to
41 facilitate customization for alternate assembler syntaxes.
42 Machines with no likelihood of an alternate syntax need not
43 define these and need not use asm_fprintf. */
45 /* The prefix for register names. Note that REGISTER_NAMES
46 is supposed to include this prefix. Also note that this is NOT an
47 fprintf format string, it is a literal string */
49 #undef REGISTER_PREFIX
50 #define REGISTER_PREFIX "%"
52 /* The prefix for local (compiler generated) labels.
53 These labels will not appear in the symbol table. */
55 #undef LOCAL_LABEL_PREFIX
56 #define LOCAL_LABEL_PREFIX "."
58 /* The prefix to add to user-visible assembler symbols. */
60 #undef USER_LABEL_PREFIX
61 #define USER_LABEL_PREFIX ""
63 #define ASM_COMMENT_START "|"
65 /* Target OS builtins. */
66 #define TARGET_OS_CPP_BUILTINS() LINUX_TARGET_OS_CPP_BUILTINS()
69 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
71 /* Provide a LINK_SPEC appropriate for GNU/Linux. Here we provide support
72 for the special GCC options -static and -shared, which allow us to
73 link things in one of these three modes by applying the appropriate
74 combinations of options at link-time. We like to support here for
75 as many of the other GNU linker options as possible. But I don't
76 have the time to search for those flags. I am sure how to add
77 support for -soname shared_object_name. H.J.
79 I took out %{v:%{!V:-V}}. It is too much :-(. They can use
82 When the -shared link option is used a final link is not being
85 /* If ELF is the default format, we should not use /lib/elf. */
87 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
90 #define LINK_SPEC "-m m68kelf %{shared} \
93 %{rdynamic:-export-dynamic} \
94 %{!dynamic-linker*:-dynamic-linker " LINUX_DYNAMIC_LINKER "}} \
97 /* For compatibility with linux/a.out */
99 #undef PCC_BITFIELD_TYPE_MATTERS
101 /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
102 keep switch tables in the text section. */
104 #define JUMP_TABLES_IN_TEXT_SECTION 1
106 /* Use the default action for outputting the case label. */
107 #undef ASM_OUTPUT_CASE_LABEL
108 #define ASM_RETURN_CASE_JUMP \
110 if (TARGET_COLDFIRE) \
112 if (ADDRESS_REG_P (operands[0])) \
113 return "jmp %%pc@(2,%0:l)"; \
115 return "ext%.l %0\n\tjmp %%pc@(2,%0:l)"; \
118 return "jmp %%pc@(2,%0:w)"; \
121 /* This is how to output an assembler line that says to advance the
122 location counter to a multiple of 2**LOG bytes. */
124 #undef ASM_OUTPUT_ALIGN
125 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
127 fprintf ((FILE), "%s%u\n", ALIGN_ASM_OP, 1 << (LOG));
129 /* If defined, a C expression whose value is a string containing the
130 assembler operation to identify the following data as uninitialized global
133 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
135 /* A C statement (sans semicolon) to output to the stdio stream
136 FILE the assembler definition of uninitialized global DECL named
137 NAME whose size is SIZE bytes and alignment is ALIGN bytes.
138 Try to use asm_output_aligned_bss to implement this macro. */
140 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
141 asm_output_aligned_bss (FILE, DECL, NAME, SIZE, ALIGN)
143 /* Output assembler code to FILE to increment profiler label # LABELNO
144 for profiling a function entry. */
145 #define NO_PROFILE_COUNTERS 1
146 #undef FUNCTION_PROFILER
147 #define FUNCTION_PROFILER(FILE, LABELNO) \
150 fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
152 fprintf (FILE, "\tjbsr _mcount\n"); \
155 /* Do not break .stabs pseudos into continuations. */
157 #define DBX_CONTIN_LENGTH 0
159 /* 1 if N is a possible register number for a function value. For
160 m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
161 pointer, or floating types, respectively. Reject fp0 if not using
162 a 68881 coprocessor. */
164 #undef FUNCTION_VALUE_REGNO_P
165 #define FUNCTION_VALUE_REGNO_P(N) \
166 ((N) == D0_REG || (N) == A0_REG || (TARGET_68881 && (N) == FP0_REG))
168 /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
169 more than one register. */
171 #undef NEEDS_UNTYPED_CALL
172 #define NEEDS_UNTYPED_CALL 1
174 /* Define how to generate (in the callee) the output value of a
175 function and how to find (in the caller) the value returned by a
176 function. VALTYPE is the data type of the value (as a tree). If
177 the precise function being called is known, FUNC is its
178 FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
179 result in d0, a0, or fp0 as appropriate. */
181 #undef FUNCTION_VALUE
182 #define FUNCTION_VALUE(VALTYPE, FUNC) \
183 m68k_function_value (VALTYPE, FUNC)
185 /* Define how to find the value returned by a library function
186 assuming the value has mode MODE.
187 For m68k/SVR4 look for integer values in d0, pointer values in d0
188 (returned in both d0 and a0), and floating values in fp0. */
191 #define LIBCALL_VALUE(MODE) \
192 m68k_libcall_value (MODE)
194 /* For m68k SVR4, structures are returned using the reentrant
196 #undef PCC_STATIC_STRUCT_RETURN
197 #define DEFAULT_PCC_STRUCT_RETURN 0
199 /* Finalize the trampoline by flushing the insn cache. */
201 #undef FINALIZE_TRAMPOLINE
202 #define FINALIZE_TRAMPOLINE(TRAMP) \
203 emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"), \
204 LCT_NORMAL, VOIDmode, 2, TRAMP, Pmode, \
205 plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);
207 /* Clear the instruction cache from `beg' to `end'. This makes an
208 inline system call to SYS_cacheflush. The arguments are as
211 cacheflush (addr, scope, cache, len)
213 addr - the start address for the flush
214 scope - the scope of the flush (see the cpush insn)
215 cache - which cache to flush (see the cpush insn)
216 len - a factor relating to the number of flushes to perform:
217 len/16 lines, or len/4096 pages. */
219 #define CLEAR_INSN_CACHE(BEG, END) \
221 register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
222 unsigned long _end = (unsigned long) (END); \
223 register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
225 ("move%.l #123, %/d0\n\t" /* system call nr */ \
226 "move%.l #1, %/d2\n\t" /* clear lines */ \
227 "move%.l #3, %/d3\n\t" /* insn+data caches */ \
230 : "d" (_beg), "d" (_len) \
231 : "%d0", "%d2", "%d3"); \
234 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
236 #define MD_UNWIND_SUPPORT "config/m68k/linux-unwind.h"