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1.1 root 1: /* Definitions for Motorola 68k running Linux with ELF format.
2: Copyright (C) 1995 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
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)
9: any later version.
10:
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.
15:
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. */
20:
21: #define LINUX_DEFAULT_ELF
22: #define MOTOROLA /* Use Motorola syntax */
23: #define USE_GAS /* But GAS wants jbsr instead of jsr */
24:
25: #include <m68k/m68k.h>
26: #include <linux.h> /* some common stuff */
27:
28: #undef TARGET_VERSION
29: #define TARGET_VERSION fprintf (stderr, " (68k Linux/ELF)");
30:
31: /* 68020 with 68881 */
32: #define TARGET_DEFAULT 7
33:
1.1.1.2 ! root 34: /* for 68k machines this only needs to be TRUE for the 68000 */
! 35:
! 36: #undef STRICT_ALIGNMENT
! 37: #define STRICT_ALIGNMENT 0
! 38:
1.1 root 39: #undef SUBTARGET_SWITCHES
40: #define SUBTARGET_SWITCHES {"ieee-fp", 0},
41:
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. */
46:
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 */
50:
51: #undef REGISTER_PREFIX
52: #define REGISTER_PREFIX "%"
53:
54: /* The prefix for local (compiler generated) labels.
55: These labels will not appear in the symbol table. */
56:
57: #undef LOCAL_LABEL_PREFIX
58: #define LOCAL_LABEL_PREFIX "."
59:
60: /* The prefix to add to user-visible assembler symbols. */
61:
62: #undef USER_LABEL_PREFIX
63: #define USER_LABEL_PREFIX ""
64:
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. */
68:
69: #undef REGISTER_NAMES
70:
71: #ifndef SUPPORT_SUN_FPA
72:
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" }
77:
78: #else /* SUPPORTED_SUN_FPA */
79:
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" }
88:
89: #endif /* defined SUPPORT_SUN_FPA */
90:
91: #undef SIZE_TYPE
92: #define SIZE_TYPE "unsigned int"
93:
94: #undef PTRDIFF_TYPE
95: #define PTRDIFF_TYPE "int"
96:
97: #undef WCHAR_TYPE
98: #define WCHAR_TYPE "long int"
99:
100: #undef WCHAR_TYPE_SIZE
101: #define WCHAR_TYPE_SIZE BITS_PER_WORD
102:
103: #undef ASM_SPEC
104: #define ASM_SPEC "%{m68030} %{m68040} %{fpic:-k} %{fPIC:-k}"
105:
106: #define CPP_PREDEFINES \
107: "-D__ELF__ -Dunix -Dmc68000 -Dmc68020 -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(m68k) -Amachine(m68k)"
108:
109: #undef CPP_SPEC
1.1.1.2 ! root 110: #ifdef USE_GNULIBC_1
1.1 root 111: #if TARGET_DEFAULT & 2
112: #define CPP_SPEC \
113: "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
114: #else
115: #define CPP_SPEC \
116: "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE}"
117: #endif
1.1.1.2 ! root 118: #else /* not USE_GNULIBC_1 */
! 119: #if TARGET_DEFAULT & 2
! 120: #define CPP_SPEC \
! 121: "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{!msoft-float:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
! 122: #else
! 123: #define CPP_SPEC \
! 124: "%{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} %{m68881:-D__HAVE_68881__} %{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
! 125: #endif
! 126: #endif
! 127:
! 128: #undef LIBGCC_SPEC
! 129: #define LIBGCC_SPEC "-lgcc"
1.1 root 130:
131: #undef LIB_SPEC
1.1.1.2 ! root 132: #ifdef USE_GNULIBC_1
1.1 root 133: #if 1
134: /* We no longer link with libc_p.a or libg.a by default. If you want
135: to profile or debug the Linux C library, please add -lc_p or -ggdb
136: to LDFLAGS at the link time, respectively. */
137: #define LIB_SPEC \
138: "%{!shared:%{!symbolic: %{mieee-fp:-lieee} %{p:-lgmon} %{pg:-lgmon} \
139: %{!ggdb:-lc} %{ggdb:-lg}}}"
140: #else
141: #define LIB_SPEC \
142: "%{!shared:%{!symbolic: \
143: %{mieee-fp:-lieee} %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
144: %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}}"
145: #endif
1.1.1.2 ! root 146: #else
! 147: #define LIB_SPEC \
! 148: "%{!shared: %{mieee-fp:-lieee} %{pthread:-lpthread} \
! 149: %{profile:-lc_p} %{!profile: -lc}}"
! 150: #endif /* not USE_GNULIBC_1 */
1.1 root 151:
152: /* Provide a LINK_SPEC appropriate for Linux. Here we provide support
153: for the special GCC options -static and -shared, which allow us to
154: link things in one of these three modes by applying the appropriate
155: combinations of options at link-time. We like to support here for
156: as many of the other GNU linker options as possible. But I don't
157: have the time to search for those flags. I am sure how to add
158: support for -soname shared_object_name. H.J.
159:
160: I took out %{v:%{!V:-V}}. It is too much :-(. They can use
161: -Wl,-V.
162:
163: When the -shared link option is used a final link is not being
164: done. */
165:
166: /* If ELF is the default format, we should not use /lib/elf. */
167:
168: #undef LINK_SPEC
1.1.1.2 ! root 169: #ifdef USE_GNULIBC_1
1.1 root 170: #ifndef LINUX_DEFAULT_ELF
171: #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
172: %{!shared:%{!symbolic: \
173: %{!static: \
174: %{rdynamic:-export-dynamic} \
175: %{!dynamic-linker*:-dynamic-linker /lib/elf/ld-linux.so.1} \
176: %{!rpath*:-rpath /lib/elf/}} %{static}}}"
177: #else
178: #define LINK_SPEC "-m m68kelf %{shared} %{symbolic:-shared -Bsymbolic} \
179: %{!shared:%{!symbolic: \
180: %{!static: \
181: %{rdynamic:-export-dynamic} \
182: %{!dynamic-linker*:-dynamic-linker /lib/ld-linux.so.1}} \
183: %{static}}}"
184: #endif
1.1.1.2 ! root 185: #else /* not USE_GNULIBC_1 */
! 186: #define LINK_SPEC "-m m68kelf %{shared} \
! 187: %{!shared: \
! 188: %{!static: \
! 189: %{rdynamic:-export-dynamic} \
! 190: %{!dynamic-linker*:-dynamic-linker /lib/ld.so.1}} \
! 191: %{static}}"
! 192: #endif /* not USE_GNULIBC_1 */
! 193:
1.1 root 194:
195: /* For compatibility with linux/a.out */
196:
197: #undef PCC_BITFIELD_TYPE_MATTERS
198:
199: /* Currently, JUMP_TABLES_IN_TEXT_SECTION must be defined in order to
200: keep switch tables in the text section. */
201:
202: #define JUMP_TABLES_IN_TEXT_SECTION 1
203:
204: /* Use the default action for outputting the case label. */
205: #undef ASM_OUTPUT_CASE_LABEL
206:
207: #define ASM_RETURN_CASE_JUMP \
208: return "jmp (2,%%pc,%0.w)"
209:
210: /* This is how to output an assembler line that says to advance the
211: location counter to a multiple of 2**LOG bytes. */
212:
213: #undef ASM_OUTPUT_ALIGN
214: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
215: if ((LOG) > 0) \
216: fprintf ((FILE), "\t%s \t%u\n", ALIGN_ASM_OP, 1 << (LOG));
217:
218: /* Output assembler code to FILE to increment profiler label # LABELNO
219: for profiling a function entry. */
220:
221: #undef FUNCTION_PROFILER
222: #define FUNCTION_PROFILER(FILE, LABELNO) \
223: { \
224: asm_fprintf (FILE, "\tlea (%LLP%d,%Rpc),%Ra1\n", (LABELNO)); \
225: if (flag_pic) \
226: fprintf (FILE, "\tbsr.l _mcount@PLTPC\n"); \
227: else \
228: fprintf (FILE, "\tjbsr _mcount\n"); \
229: }
230:
231: /* How to renumber registers for dbx and gdb.
232: On the Sun-3, the floating point registers have numbers
233: 18 to 25, not 16 to 23 as they do in the compiler. */
234:
235: #define DBX_REGISTER_NUMBER(REGNO) ((REGNO) < 16 ? (REGNO) : (REGNO) + 2)
236:
237: /* Do not break .stabs pseudos into continuations. */
238:
239: #define DBX_CONTIN_LENGTH 0
240:
241: /* Allow folding division by zero. */
242: #define REAL_INFINITY
243:
244: /* 1 if N is a possible register number for a function value. For
245: m68k/SVR4 allow d0, a0, or fp0 as return registers, for integral,
246: pointer, or floating types, respectively. Reject fp0 if not using
247: a 68881 coprocessor. */
248:
249: #undef FUNCTION_VALUE_REGNO_P
250: #define FUNCTION_VALUE_REGNO_P(N) \
251: ((N) == 0 || (N) == 8 || (TARGET_68881 && (N) == 16))
252:
253: /* Define this to be true when FUNCTION_VALUE_REGNO_P is true for
254: more than one register. */
255:
256: #undef NEEDS_UNTYPED_CALL
257: #define NEEDS_UNTYPED_CALL 1
258:
259: /* Define how to generate (in the callee) the output value of a
260: function and how to find (in the caller) the value returned by a
261: function. VALTYPE is the data type of the value (as a tree). If
262: the precise function being called is known, FUNC is its
263: FUNCTION_DECL; otherwise, FUNC is 0. For m68k/SVR4 generate the
264: result in d0, a0, or fp0 as appropriate. */
265:
266: #undef FUNCTION_VALUE
267: #define FUNCTION_VALUE(VALTYPE, FUNC) \
268: (TREE_CODE (VALTYPE) == REAL_TYPE && TARGET_68881 \
269: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 16) \
270: : (POINTER_TYPE_P (VALTYPE) \
271: ? gen_rtx (REG, TYPE_MODE (VALTYPE), 8) \
272: : gen_rtx (REG, TYPE_MODE (VALTYPE), 0)))
273:
274: /* For compatibility with the large body of existing code which does
275: not always properly declare external functions returning pointer
276: types, the m68k/SVR4 convention is to copy the value returned for
277: pointer functions from a0 to d0 in the function epilogue, so that
278: callers that have neglected to properly declare the callee can
279: still find the correct return value. */
280:
281: extern int current_function_returns_pointer;
282: #define FUNCTION_EXTRA_EPILOGUE(FILE, SIZE) \
283: do { \
284: if ((current_function_returns_pointer) && \
285: ! find_equiv_reg (0, get_last_insn (), 0, 0, 0, 8, Pmode)) \
286: asm_fprintf (FILE, "\tmove.l %Ra0,%Rd0\n"); \
287: } while (0);
288:
289: /* Define how to find the value returned by a library function
290: assuming the value has mode MODE.
291: For m68k/SVR4 look for integer values in d0, pointer values in d0
292: (returned in both d0 and a0), and floating values in fp0. */
293:
294: #undef LIBCALL_VALUE
295: #define LIBCALL_VALUE(MODE) \
1.1.1.2 ! root 296: ((((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode) \
! 297: && TARGET_68881) \
1.1 root 298: ? gen_rtx (REG, (MODE), 16) \
299: : gen_rtx (REG, (MODE), 0))
300:
301: /* In m68k svr4, a symbol_ref rtx can be a valid PIC operand if it is
302: an operand of a function call. */
303: #undef LEGITIMATE_PIC_OPERAND_P
304: #define LEGITIMATE_PIC_OPERAND_P(X) \
1.1.1.2 ! root 305: ((! symbolic_operand (X, VOIDmode) \
! 306: && ! (GET_CODE (X) == CONST_DOUBLE && CONST_DOUBLE_MEM (X) \
! 307: && GET_CODE (CONST_DOUBLE_MEM (X)) == MEM \
! 308: && symbolic_operand (XEXP (CONST_DOUBLE_MEM (X), 0), VOIDmode))) \
1.1 root 309: || (GET_CODE (X) == SYMBOL_REF && SYMBOL_REF_FLAG (X)))
310:
311: /* Turn off function cse if we are doing PIC. We always want function
312: call to be done as `bsr foo@PLTPC', so it will force the assembler
313: to create the PLT entry for `foo'. Doing function cse will cause
314: the address of `foo' to be loaded into a register, which is exactly
315: what we want to avoid when we are doing PIC on svr4 m68k. */
316: #undef SUBTARGET_OVERRIDE_OPTIONS
317: #define SUBTARGET_OVERRIDE_OPTIONS \
318: if (flag_pic) flag_no_function_cse = 1;
319:
320: /* For m68k SVR4, structures are returned using the reentrant
321: technique. */
322: #undef PCC_STATIC_STRUCT_RETURN
323: #define DEFAULT_PCC_STRUCT_RETURN 0
1.1.1.2 ! root 324:
! 325: /* Finalize the trampoline by flushing the insn cache. */
! 326:
! 327: #undef FINALIZE_TRAMPOLINE
! 328: #define FINALIZE_TRAMPOLINE(TRAMP) \
! 329: emit_library_call (gen_rtx (SYMBOL_REF, Pmode, "__clear_cache"), \
! 330: 0, VOIDmode, 2, TRAMP, Pmode, \
! 331: plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);
! 332:
! 333: /* Clear the instruction cache from `beg' to `end'. This makes an
! 334: inline system call to SYS_cacheflush. The arguments are as
! 335: follows:
! 336:
! 337: cacheflush (addr, scope, cache, len)
! 338:
! 339: addr - the start address for the flush
! 340: scope - the scope of the flush (see the cpush insn)
! 341: cache - which cache to flush (see the cpush insn)
! 342: len - a factor relating to the number of flushes to perform:
! 343: len/16 lines, or len/4096 pages. */
! 344:
! 345: #define CLEAR_INSN_CACHE(BEG, END) \
! 346: { \
! 347: register unsigned long _beg __asm ("%d1") = (unsigned long) (BEG); \
! 348: unsigned long _end = (unsigned long) (END); \
! 349: register unsigned long _len __asm ("%d4") = (_end - _beg + 32); \
! 350: __asm __volatile \
! 351: ("move%.l %#123, %/d0\n\t" /* system call nr */ \
! 352: "move%.l %#1, %/d2\n\t" /* clear lines */ \
! 353: "move%.l %#3, %/d3\n\t" /* insn+data caches */ \
! 354: "trap %#0" \
! 355: : /* no outputs */ \
! 356: : "d" (_beg), "d" (_len) \
! 357: : "%d0", "%d2", "%d3"); \
! 358: }
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