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1 709 jeremybenn 
/* Definitions of target machine for GNU compiler, for MMIX.
2 
   Copyright (C) 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010, 2011
3 
   Free Software Foundation, Inc.
4 
   Contributed by Hans-Peter Nilsson (hp@bitrange.com)
5 
 
6 
This file is part of GCC.
7 
 
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)
11 
any later version.
12 
 
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.
17 
 
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/>.  */
21 
 
22 
#ifndef GCC_MMIX_H
23 
#define GCC_MMIX_H
24 
 
25 
/* First, some local helper macros.  Note that the "default" value of
26 
   FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and
27 
   REG_CLASS_CONTENTS depend on these values.  */
28 
#define MMIX_RESERVED_GNU_ARG_0_REGNUM 231
29 
#define MMIX_FIRST_ARG_REGNUM \
30 
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16)
31 
#define MMIX_FIRST_INCOMING_ARG_REGNUM \
32 
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
33 
#define MMIX_MAX_ARGS_IN_REGS 16
34 
 
35 
/* FIXME: This one isn't fully implemented yet.  Return values larger than
36 
   one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the
37 
   caller, except for return values of type "complex".  */
38 
#define MMIX_MAX_REGS_FOR_VALUE 16
39 
#define MMIX_RETURN_VALUE_REGNUM \
40 
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15)
41 
#define MMIX_OUTGOING_RETURN_VALUE_REGNUM \
42 
  (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0)
43 
#define MMIX_STRUCT_VALUE_REGNUM 251
44 
#define MMIX_STATIC_CHAIN_REGNUM 252
45 
#define MMIX_FRAME_POINTER_REGNUM 253
46 
#define MMIX_STACK_POINTER_REGNUM 254
47 
#define MMIX_LAST_GENERAL_REGISTER 255
48 
#define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM
49 
#define MMIX_HIMULT_REGNUM 258
50 
#define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM
51 
#define MMIX_ARG_POINTER_REGNUM 261
52 
#define MMIX_rO_REGNUM 262
53 
#define MMIX_LAST_STACK_REGISTER_REGNUM 31
54 
 
55 
/* Four registers; "ideally, these registers should be call-clobbered", so
56 
   just grab a bunch of the common clobbered registers.  FIXME: Last
57 
   registers of return-value should be used, with an error if there's a
58 
   return-value (that collides in size).  */
59 
#define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4)
60 
 
61 
/* Try to keep the definitions from running away on their own.  */
62 
#if (MMIX_EH_RETURN_DATA_REGNO_START \
63 
     != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS)
64 
 #error MMIX register definition inconsistency
65 
#endif
66 
 
67 
#if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32)
68 
 #error MMIX parameters and return values bad, more than 32 registers
69 
#endif
70 
 
71 
/* This chosen as "a call-clobbered hard register that is otherwise
72 
   untouched by the epilogue".  */
73 
#define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM
74 
 
75 
#ifdef REG_OK_STRICT
76 
# define MMIX_REG_OK_STRICT 1
77 
#else
78 
# define MMIX_REG_OK_STRICT 0
79 
#endif
80 
 
81 
#define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \
82 
 ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE))
83 
 
84 
/* Per-function machine data.  This is normally an opaque type just
85 
   defined and used in the tm.c file, but we need to see the definition in
86 
   mmix.md too.  */
87 
struct GTY(()) machine_function
88 
 {
89 
   int has_landing_pad;
90 
   int highest_saved_stack_register;
91 
   int in_prologue;
92 
 };
93 
 
94 
/* For these target macros, there is no generic documentation here.  You
95 
   should read `Using and Porting GCC' for that.  Only comments specific
96 
   to the MMIX target are here.
97 
 
98 
   There are however references to the specific texinfo node (comments
99 
   with "Node:"), so there should be little or nothing amiss.  Probably
100 
   the opposite, since we don't have to care about old littering and
101 
   soon outdated generic comments.  */
102 
 
103 
/* Node: Driver */
104 
 
105 
/* User symbols are in the same name-space as built-in symbols, but we
106 
   don't need the built-in symbols, so remove those and instead apply
107 
   stricter operand checking.  Don't warn when expanding insns.  */
108 
#define ASM_SPEC "-no-predefined-syms -x"
109 
 
110 
/* Pass on -mset-program-start=N and -mset-data-start=M to the linker.
111 
   Provide default program start 0x100 unless -mno-set-program-start.
112 
   Don't do this if linking relocatably, with -r.  For a final link,
113 
   produce mmo, unless ELF is requested or when linking relocatably.  */
114 
#define LINK_SPEC \
115 
 "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\
116 
  %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\
117 
  %{!mset-program-start=*:\
118 
    %{!mno-set-program-start:\
119 
     %{!r:--defsym __.MMIX.start..text=0x100}}}\
120 
  %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}"
121 
 
122 
/* FIXME: There's no provision for profiling here.  */
123 
#define STARTFILE_SPEC  \
124 
  "crti%O%s crtbegin%O%s"
125 
 
126 
#define ENDFILE_SPEC "crtend%O%s crtn%O%s"
127 
 
128 
/* Node: Run-time Target */
129 
 
130 
/* Define __LONG_MAX__, since we're advised not to change glimits.h.  */
131 
#define TARGET_CPU_CPP_BUILTINS()                               \
132 
  do                                                            \
133 
    {                                                           \
134 
      builtin_define ("__mmix__");                              \
135 
      builtin_define ("__MMIX__");                              \
136 
      if (TARGET_ABI_GNU)                                       \
137 
        builtin_define ("__MMIX_ABI_GNU__");                    \
138 
      else                                                      \
139 
        builtin_define ("__MMIX_ABI_MMIXWARE__");               \
140 
    }                                                           \
141 
  while (0)
142 
 
143 
#define TARGET_DEFAULT \
144 
 (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN)
145 
 
146 
 
147 
/* Node: Per-Function Data */
148 
#define INIT_EXPANDERS mmix_init_expanders ()
149 
 
150 
 
151 
/* Node: Storage Layout */
152 
/* I see no bit-field instructions.  Anyway, the common order is from low
153 
   to high, as the power of two, hence little-endian.  */
154 
#define BITS_BIG_ENDIAN 0
155 
#define BYTES_BIG_ENDIAN 1
156 
#define WORDS_BIG_ENDIAN 1
157 
#define FLOAT_WORDS_BIG_ENDIAN 1
158 
#define UNITS_PER_WORD 8
159 
 
160 
/* We need to align everything to 64 bits that can affect the alignment
161 
   of other types.  Since address N is interpreted in MMIX as (N modulo
162 
   access_size), we must align.  */
163 
#define PARM_BOUNDARY 64
164 
#define STACK_BOUNDARY 64
165 
#define FUNCTION_BOUNDARY 32
166 
#define BIGGEST_ALIGNMENT 64
167 
 
168 
/* This one is only used in the ADA front end.  */
169 
#define MINIMUM_ATOMIC_ALIGNMENT 8
170 
 
171 
/* Copied from elfos.h.  */
172 
#define MAX_OFILE_ALIGNMENT (32768 * 8)
173 
 
174 
#define DATA_ALIGNMENT(TYPE, BASIC_ALIGN) \
175 
 mmix_data_alignment (TYPE, BASIC_ALIGN)
176 
 
177 
#define CONSTANT_ALIGNMENT(CONSTANT, BASIC_ALIGN) \
178 
 mmix_constant_alignment (CONSTANT, BASIC_ALIGN)
179 
 
180 
#define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \
181 
 mmix_local_alignment (TYPE, BASIC_ALIGN)
182 
 
183 
/* Following other ports, this seems to most commonly be the word-size,
184 
   so let's do that here too.  */
185 
#define EMPTY_FIELD_BOUNDARY 64
186 
 
187 
/* We chose to have this low solely for similarity with the alpha.  It has
188 
   nothing to do with passing the tests dg/c99-scope-2 and
189 
   execute/align-1.c.  Nothing.  Though the tests seem wrong.  Padding of
190 
   the structure is automatically added to get alignment when needed if we
191 
   set this to just byte-boundary.  */
192 
#define STRUCTURE_SIZE_BOUNDARY 8
193 
 
194 
/* The lower bits are ignored.  */
195 
#define STRICT_ALIGNMENT 1
196 
 
197 
 
198 
/* Node: Type Layout */
199 
 
200 
/* It might seem more natural to have 64-bit ints on a 64-bit machine,
201 
   but then an occasional MMIX programmer needs to know how to put a lot
202 
   of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather
203 
   than the "intuitive" char, short and int types.  */
204 
#define INT_TYPE_SIZE 32
205 
#define SHORT_TYPE_SIZE 16
206 
#define LONG_LONG_TYPE_SIZE 64
207 
 
208 
#define FLOAT_TYPE_SIZE 32
209 
#define DOUBLE_TYPE_SIZE 64
210 
#define LONG_DOUBLE_TYPE_SIZE 64
211 
 
212 
#define DEFAULT_SIGNED_CHAR 1
213 
 
214 
 
215 
/* Node: Register Basics */
216 
/* We tell GCC about all 256 general registers, and we also include
217 
   rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns
218 
   clobber them.  We use a faked register for the argument pointer.  It is
219 
   always eliminated towards the frame-pointer or the stack-pointer, never
220 
   output in assembly.  Any fixed register would do for this, like $255,
221 
   but future debugging is easier when using a separate register.  It
222 
   counts as a global register for pseudorandom reasons.  */
223 
#define FIRST_PSEUDO_REGISTER 263
224 
 
225 
/* We treat general registers with no assigned purpose as fixed.  The
226 
   stack pointer, $254, is also fixed.  Register $255 is referred to as a
227 
   temporary register in the MMIX papers, and used as such in mmixal, so
228 
   it should not be used as a stack pointer.  We set it to fixed, and use
229 
   it "manually" at times of despair.  */
230 
#define FIXED_REGISTERS \
231 
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
232 
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
233 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
234 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
235 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
236 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
237 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
238 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
239 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
240 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
241 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
242 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
243 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
244 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
245 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
246 
   1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \
247 
   1, 1, 0, 0, 0, 1, 1 \
248 
 }
249 
 
250 
/* General registers are fixed and therefore "historically" marked
251 
   call-used.  (FIXME: This has changed).  Registers $15..$31 are
252 
   call-clobbered; we'll put arguments in $16 and up, and we need $15 for
253 
   the MMIX register-stack "hole".  */
254 
#define CALL_USED_REGISTERS \
255 
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \
256 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
257 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
258 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
259 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
260 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
261 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
262 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
263 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
264 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
265 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
266 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
267 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
268 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
269 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
270 
   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \
271 
   1, 1, 1, 1, 1, 1, 1 \
272 
 }
273 
 
274 
#define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0)
275 
 
276 
#define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1)
277 
 
278 
/* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue,
279 
   else GCC will be confused that those registers aren't saved and
280 
   restored.  */
281 
#define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO)
282 
 
283 
/* Node: Allocation Order */
284 
 
285 
/* We should allocate registers from 0 to 31 by increasing number, because
286 
   I think that's what people expect.  Beyond that, just use
287 
   call-clobbered global registers first, then call-clobbered special
288 
   registers.  Last, the fixed registers.  */
289 
#define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER       \
290 
 { 0, 1, 2, 3, 4, 5, 6, 7,                       \
291 
   8, 9, 10, 11, 12, 13, 14, 15,                \
292 
   16, 17, 18, 19, 20, 21, 22, 23,              \
293 
   24, 25, 26, 27, 28, 29, 30, 31,              \
294 
                                                \
295 
   252, 251, 250, 249, 248, 247,                \
296 
                                                \
297 
   253,                                         \
298 
                                                \
299 
   258, 260, 259,                               \
300 
                                                \
301 
   32, 33, 34, 35, 36, 37, 38, 39,              \
302 
   40, 41, 42, 43, 44, 45, 46, 47,              \
303 
   48, 49, 50, 51, 52, 53, 54, 55,              \
304 
   56, 57, 58, 59, 60, 61, 62, 63,              \
305 
   64, 65, 66, 67, 68, 69, 70, 71,              \
306 
   72, 73, 74, 75, 76, 77, 78, 79,              \
307 
   80, 81, 82, 83, 84, 85, 86, 87,              \
308 
   88, 89, 90, 91, 92, 93, 94, 95,              \
309 
   96, 97, 98, 99, 100, 101, 102, 103,          \
310 
   104, 105, 106, 107, 108, 109, 110, 111,      \
311 
   112, 113, 114, 115, 116, 117, 118, 119,      \
312 
   120, 121, 122, 123, 124, 125, 126, 127,      \
313 
   128, 129, 130, 131, 132, 133, 134, 135,      \
314 
   136, 137, 138, 139, 140, 141, 142, 143,      \
315 
   144, 145, 146, 147, 148, 149, 150, 151,      \
316 
   152, 153, 154, 155, 156, 157, 158, 159,      \
317 
   160, 161, 162, 163, 164, 165, 166, 167,      \
318 
   168, 169, 170, 171, 172, 173, 174, 175,      \
319 
   176, 177, 178, 179, 180, 181, 182, 183,      \
320 
   184, 185, 186, 187, 188, 189, 190, 191,      \
321 
   192, 193, 194, 195, 196, 197, 198, 199,      \
322 
   200, 201, 202, 203, 204, 205, 206, 207,      \
323 
   208, 209, 210, 211, 212, 213, 214, 215,      \
324 
   216, 217, 218, 219, 220, 221, 222, 223,      \
325 
   224, 225, 226, 227, 228, 229, 230, 231,      \
326 
   232, 233, 234, 235, 236, 237, 238, 239,      \
327 
   240, 241, 242, 243, 244, 245, 246,           \
328 
                                                \
329 
   254, 255, 256, 257, 261, 262                 \
330 
 }
331 
 
332 
/* As a convenience, we put this nearby, for ease of comparison.
333 
   First, call-clobbered registers in reverse order of assignment as
334 
   parameters (also the top ones; not because they're parameters, but
335 
   for continuity).
336 
 
337 
   Second, saved registers that go on the register-stack.
338 
 
339 
   Third, special registers rH, rR and rJ.  They should not normally be
340 
   allocated, but since they're call-clobbered, it is cheaper to use one
341 
   of them than using a call-saved register for a call-clobbered use,
342 
   assuming it is referenced a very limited number of times.  Other global
343 
   and fixed registers come next; they are never allocated.  */
344 
#define MMIX_GNU_ABI_REG_ALLOC_ORDER            \
345 
 { 252, 251, 250, 249, 248, 247, 246,           \
346 
   245, 244, 243, 242, 241, 240, 239, 238,      \
347 
   237, 236, 235, 234, 233, 232, 231,           \
348 
                                                \
349 
   0, 1, 2, 3, 4, 5, 6, 7,                       \
350 
   8, 9, 10, 11, 12, 13, 14, 15,                \
351 
   16, 17, 18, 19, 20, 21, 22, 23,              \
352 
   24, 25, 26, 27, 28, 29, 30, 31,              \
353 
                                                \
354 
   253,                                         \
355 
                                                \
356 
   258, 260, 259,                               \
357 
                                                \
358 
   32, 33, 34, 35, 36, 37, 38, 39,              \
359 
   40, 41, 42, 43, 44, 45, 46, 47,              \
360 
   48, 49, 50, 51, 52, 53, 54, 55,              \
361 
   56, 57, 58, 59, 60, 61, 62, 63,              \
362 
   64, 65, 66, 67, 68, 69, 70, 71,              \
363 
   72, 73, 74, 75, 76, 77, 78, 79,              \
364 
   80, 81, 82, 83, 84, 85, 86, 87,              \
365 
   88, 89, 90, 91, 92, 93, 94, 95,              \
366 
   96, 97, 98, 99, 100, 101, 102, 103,          \
367 
   104, 105, 106, 107, 108, 109, 110, 111,      \
368 
   112, 113, 114, 115, 116, 117, 118, 119,      \
369 
   120, 121, 122, 123, 124, 125, 126, 127,      \
370 
   128, 129, 130, 131, 132, 133, 134, 135,      \
371 
   136, 137, 138, 139, 140, 141, 142, 143,      \
372 
   144, 145, 146, 147, 148, 149, 150, 151,      \
373 
   152, 153, 154, 155, 156, 157, 158, 159,      \
374 
   160, 161, 162, 163, 164, 165, 166, 167,      \
375 
   168, 169, 170, 171, 172, 173, 174, 175,      \
376 
   176, 177, 178, 179, 180, 181, 182, 183,      \
377 
   184, 185, 186, 187, 188, 189, 190, 191,      \
378 
   192, 193, 194, 195, 196, 197, 198, 199,      \
379 
   200, 201, 202, 203, 204, 205, 206, 207,      \
380 
   208, 209, 210, 211, 212, 213, 214, 215,      \
381 
   216, 217, 218, 219, 220, 221, 222, 223,      \
382 
   224, 225, 226, 227, 228, 229, 230,           \
383 
                                                \
384 
   254, 255, 256, 257, 261, 262                 \
385 
 }
386 
 
387 
/* The default one.  */
388 
#define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER
389 
 
390 
/* Node: Values in Registers */
391 
 
392 
#define HARD_REGNO_NREGS(REGNO, MODE)                   \
393 
   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1)         \
394 
    / UNITS_PER_WORD)
395 
 
396 
#define HARD_REGNO_MODE_OK(REGNO, MODE) 1
397 
 
398 
/* Note that no register can really be accessed in single-float mode, so
399 
   we *can* say 1 here.  FIXME:  Will TRT happen for single-float, or do
400 
   we have to punt to libgcc1.asm?  */
401 
#define MODES_TIEABLE_P(MODE1, MODE2) 1
402 
 
403 
 
404 
/* Node: Leaf Functions */
405 
/* (empty) */
406 
 
407 
 
408 
/* Node: Register Classes */
409 
 
410 
enum reg_class
411 
 {
412 
   NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG,
413 
   SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES
414 
 };
415 
 
416 
#define N_REG_CLASSES (int) LIM_REG_CLASSES
417 
 
418 
#define REG_CLASS_NAMES                                         \
419 
 {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG",     \
420 
  "SYSTEM_REGS", "ALL_REGS"}
421 
 
422 
/* Note that the contents of each item is always 32 bits.  */
423 
#define REG_CLASS_CONTENTS                      \
424 
 {{0, 0, 0, 0, 0, 0, 0, 0, 0},                   \
425 
  {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20},       \
426 
  {0, 0, 0, 0, 0, 0, 0, 0, 0x10},               \
427 
  {0, 0, 0, 0, 0, 0, 0, 0, 4},                  \
428 
  {0, 0, 0, 0, 0, 0, 0, 0, 0x7f},               \
429 
  {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}}
430 
 
431 
#define REGNO_REG_CLASS(REGNO)                                  \
432 
 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
433 
  || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
434 
  ? GENERAL_REGS                                                \
435 
  : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG            \
436 
  : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS)
437 
 
438 
#define BASE_REG_CLASS GENERAL_REGS
439 
 
440 
#define INDEX_REG_CLASS GENERAL_REGS
441 
 
442 
#define REG_CLASS_FROM_LETTER(CHAR)             \
443 
 ((CHAR) == 'x' ? SYSTEM_REGS                   \
444 
  : (CHAR) == 'y' ? REMAINDER_REG               \
445 
  : (CHAR) == 'z' ? HIMULT_REG : NO_REGS)
446 
 
447 
#define REGNO_OK_FOR_BASE_P(REGNO)                              \
448 
 ((REGNO) <= MMIX_LAST_GENERAL_REGISTER                         \
449 
  || (REGNO) == MMIX_ARG_POINTER_REGNUM                         \
450 
  || (reg_renumber[REGNO] > 0                                    \
451 
      && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER))
452 
 
453 
#define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO)
454 
 
455 
#define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \
456 
 mmix_secondary_reload_class (CLASS, MODE, X, 1)
457 
 
458 
#define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \
459 
 mmix_secondary_reload_class (CLASS, MODE, X, 0)
460 
 
461 
#define CLASS_MAX_NREGS(CLASS, MODE) HARD_REGNO_NREGS (CLASS, MODE)
462 
 
463 
#define CONST_OK_FOR_LETTER_P(VALUE, C) \
464 
 mmix_const_ok_for_letter_p (VALUE, C)
465 
 
466 
#define EXTRA_CONSTRAINT(VALUE, C)      \
467 
 mmix_extra_constraint (VALUE, C, MMIX_REG_OK_STRICT)
468 
 
469 
/* Do we need anything serious here?  Yes, any FLOT constant.  */
470 
#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                  \
471 
 mmix_const_double_ok_for_letter_p (VALUE, C)
472 
 
473 
 
474 
/* Node: Frame Layout */
475 
 
476 
#define STACK_GROWS_DOWNWARD
477 
#define FRAME_GROWS_DOWNWARD 1
478 
 
479 
#define STARTING_FRAME_OFFSET \
480 
  mmix_starting_frame_offset ()
481 
 
482 
#define FIRST_PARM_OFFSET(FUNDECL) 0
483 
 
484 
#define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \
485 
 mmix_dynamic_chain_address (FRAMEADDR)
486 
 
487 
/* FIXME: It seems RETURN_ADDR_OFFSET is undocumented.  */
488 
 
489 
#define SETUP_FRAME_ADDRESSES() \
490 
 mmix_setup_frame_addresses ()
491 
 
492 
#define RETURN_ADDR_RTX(COUNT, FRAME)           \
493 
 mmix_return_addr_rtx (COUNT, FRAME)
494 
 
495 
/* It's in rJ before we store it somewhere.  */
496 
#define INCOMING_RETURN_ADDR_RTX \
497 
 gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
498 
 
499 
/* FIXME: This does not seem properly documented or cross-indexed.
500 
   Nowhere except in the code does it say it *has* to be in the range
501 
   0..255, or else it will be truncated.  That goes for the default too.  */
502 
#define DWARF_FRAME_RETURN_COLUMN \
503 
 DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
504 
 
505 
/* No return address is stored there.  */
506 
#define INCOMING_FRAME_SP_OFFSET 0
507 
 
508 
/* Node: Stack Checking */
509 
/* (empty) */
510 
 
511 
 
512 
/* Node: Exception Handling */
513 
 
514 
#define EH_RETURN_DATA_REGNO(N) \
515 
 mmix_eh_return_data_regno (N)
516 
 
517 
#define EH_RETURN_STACKADJ_RTX \
518 
 mmix_eh_return_stackadj_rtx ()
519 
 
520 
#define EH_RETURN_HANDLER_RTX \
521 
 mmix_eh_return_handler_rtx ()
522 
 
523 
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
524 
 mmix_asm_preferred_eh_data_format (CODE, GLOBAL)
525 
 
526 
/* Node: Frame Registers */
527 
#define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM
528 
 
529 
/* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on
530 
   what register we want to use.  */
531 
#define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM
532 
#define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM
533 
 
534 
#define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM
535 
 
536 
 
537 
/* Node: Elimination */
538 
 
539 
/* The frame-pointer is stored in a location that either counts to the
540 
   offset of incoming parameters, or that counts to the offset of the
541 
   frame, so we can't use a single offset.  We therefore eliminate those
542 
   two separately.  */
543 
#define ELIMINABLE_REGS                         \
544 
 {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},   \
545 
  {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
546 
  {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
547 
 
548 
#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
549 
 (OFFSET) = mmix_initial_elimination_offset (FROM, TO)
550 
 
551 
 
552 
/* Node: Stack Arguments */
553 
 
554 
#define ACCUMULATE_OUTGOING_ARGS 1
555 
 
556 
 
557 
/* Node: Register Arguments */
558 
 
559 
typedef struct { int regs; int lib; } CUMULATIVE_ARGS;
560 
 
561 
#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
562 
 ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0))
563 
 
564 
#define FUNCTION_ARG_REGNO_P(REGNO)             \
565 
 mmix_function_arg_regno_p (REGNO, 0)
566 
 
567 
 
568 
/* Node: Caller Saves */
569 
/* (empty) */
570 
 
571 
 
572 
/* Node: Function Entry */
573 
 
574 
/* See mmix.c for TARGET_ASM_FUNCTION_PROLOGUE and
575 
   TARGET_ASM_FUNCTION_EPILOGUE.  */
576 
 
577 
/* We need to say that the epilogue uses the return address, so the
578 
   initial-value machinery restores it.  FIXME: Some targets
579 
   conditionalize on "reload_completed &&".  Investigate difference.
580 
   FIXME: Not needed if nonlocal_goto_stack_level.  */
581 
#define EPILOGUE_USES(REGNO) \
582 
 ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM)
583 
 
584 
/* Node: Profiling */
585 
#define FUNCTION_PROFILER(FILE, LABELNO)        \
586 
 mmix_function_profiler (FILE, LABELNO)
587 
 
588 
/* Node: Trampolines */
589 
 
590 
#define TRAMPOLINE_SIZE         (4*UNITS_PER_WORD)
591 
#define TRAMPOLINE_ALIGNMENT    BITS_PER_WORD
592 
 
593 
/* Node: Addressing Modes */
594 
 
595 
#define CONSTANT_ADDRESS_P(X) \
596 
 mmix_constant_address_p (X)
597 
 
598 
#define MAX_REGS_PER_ADDRESS 2
599 
 
600 
 
601 
/* Node: Condition Code */
602 
 
603 
#define SELECT_CC_MODE(OP, X, Y)                \
604 
 mmix_select_cc_mode (OP, X, Y)
605 
 
606 
/* A definition of CANONICALIZE_COMPARISON that changed LE and GT
607 
   comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU
608 
   comparisons with 256 to 255 and LE, LEU, GT and GTU has been
609 
   ineffective; the code path for performing the changes did not trig for
610 
   neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz
611 
   itself (core GCC functionality supposedly handling it) with sources
612 
   from 2002-06-06.  */
613 
 
614 
#define REVERSIBLE_CC_MODE(MODE)                \
615 
 mmix_reversible_cc_mode (MODE)
616 
 
617 
 
618 
/* Node: Costs */
619 
 
620 
#define SLOW_BYTE_ACCESS 0
621 
 
622 
 
623 
/* Node: Sections */
624 
 
625 
/* This must be a constant string, since it's used in crtstuff.c.  */
626 
#define TEXT_SECTION_ASM_OP \
627 
 "\t.text ! mmixal:= 9H LOC 8B"
628 
 
629 
/* FIXME: Not documented.  */
630 
#define DATA_SECTION_ASM_OP \
631 
 mmix_data_section_asm_op ()
632 
 
633 
#define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
634 
 
635 
/* Node: PIC */
636 
/* (empty) */
637 
 
638 
 
639 
/* Node: File Framework */
640 
 
641 
/* While any other punctuation character but ";" would do, we prefer "%"
642 
   or "!"; "!" is an unary operator and so will not be mistakenly included
643 
   in correctly formed expressions.  The hash character adds mass; catches
644 
   the eye.  We can't have it as a comment char by itself, since it's a
645 
   hex-number prefix.  */
646 
#define ASM_COMMENT_START "!#"
647 
 
648 
/* These aren't currently functional.  We just keep them as markers.  */
649 
#define ASM_APP_ON "%APP\n"
650 
#define ASM_APP_OFF "%NO_APP\n"
651 
 
652 
#define OUTPUT_QUOTED_STRING(STREAM, STRING) \
653 
 mmix_output_quoted_string (STREAM, STRING, strlen (STRING))
654 
 
655 
#define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
656 
 
657 
/* Node: Data Output */
658 
 
659 
#define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \
660 
 mmix_asm_output_ascii (STREAM, PTR, LEN)
661 
 
662 
/* Node: Uninitialized Data */
663 
 
664 
#define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \
665 
 mmix_asm_output_aligned_common (ST, N, S, A)
666 
 
667 
#define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \
668 
 mmix_asm_output_aligned_local (ST, N, S, A)
669 
 
670 
 
671 
/* Node: Label Output */
672 
 
673 
#define ASM_OUTPUT_LABEL(STREAM, NAME) \
674 
 mmix_asm_output_label (STREAM, NAME)
675 
 
676 
#define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \
677 
 mmix_asm_output_internal_label (STREAM, NAME)
678 
 
679 
#define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \
680 
 mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME)
681 
 
682 
#define GLOBAL_ASM_OP "\t.global "
683 
 
684 
#define ASM_WEAKEN_LABEL(STREAM, NAME) \
685 
 mmix_asm_weaken_label (STREAM, NAME)
686 
 
687 
#define MAKE_DECL_ONE_ONLY(DECL) \
688 
 mmix_make_decl_one_only (DECL)
689 
 
690 
#define ASM_OUTPUT_LABELREF(STREAM, NAME) \
691 
 mmix_asm_output_labelref (STREAM, NAME)
692 
 
693 
/* We insert a ":" to disambiguate against user symbols like L5.  */
694 
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
695 
 sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM))
696 
 
697 
/* Insert "::"; these are rarer than internal labels.  FIXME: Make sure no
698 
   ":" is seen in the object file; we don't really want that mmixal
699 
   feature visible there.  We don't want the default, which uses a dot;
700 
   that'd be incompatible with mmixal.  */
701 
#define ASM_PN_FORMAT "%s::%lu"
702 
 
703 
#define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \
704 
 mmix_asm_output_def (STREAM, NAME, VALUE)
705 
 
706 
/* Node: Macros for Initialization */
707 
/* We're compiling to ELF and linking to MMO; fundamental ELF features
708 
   that GCC depend on are there.  */
709 
 
710 
/* These must be constant strings, since they're used in crtstuff.c.  */
711 
#define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible"
712 
 
713 
#define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible"
714 
 
715 
#define OBJECT_FORMAT_ELF
716 
 
717 
 
718 
/* Node: Instruction Output */
719 
 
720 
/* The non-$ register names must be prefixed with ":", since they're
721 
   affected by PREFIX.  We provide the non-colon names as additional
722 
   names.  */
723 
#define REGISTER_NAMES                                                  \
724 
 {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",                       \
725 
  "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",                 \
726 
  "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",               \
727 
  "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31",               \
728 
  "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39",               \
729 
  "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47",               \
730 
  "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55",               \
731 
  "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63",               \
732 
  "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71",               \
733 
  "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79",               \
734 
  "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87",               \
735 
  "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95",               \
736 
  "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103",           \
737 
  "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111",       \
738 
  "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119",       \
739 
  "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127",       \
740 
  "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135",       \
741 
  "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143",       \
742 
  "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151",       \
743 
  "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159",       \
744 
  "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167",       \
745 
  "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175",       \
746 
  "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183",       \
747 
  "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191",       \
748 
  "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199",       \
749 
  "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207",       \
750 
  "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215",       \
751 
  "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223",       \
752 
  "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231",       \
753 
  "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239",       \
754 
  "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247",       \
755 
  "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255",       \
756 
  ":rD",  ":rE",  ":rH",  ":rJ",  ":rR",  "ap_!BAD!", ":rO"}
757 
 
758 
#define ADDITIONAL_REGISTER_NAMES                       \
759 
 {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257},  \
760 
  {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}}
761 
 
762 
#define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \
763 
 mmix_asm_output_reg_push (STREAM, REGNO)
764 
 
765 
#define ASM_OUTPUT_REG_POP(STREAM, REGNO) \
766 
 mmix_asm_output_reg_pop (STREAM, REGNO)
767 
 
768 
 
769 
/* Node: Dispatch Tables */
770 
 
771 
/* We define both types, since SImode is the better, but DImode the only
772 
   possible for mmixal so that's the one actually used.  */
773 
#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \
774 
 mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL)
775 
 
776 
#define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \
777 
 mmix_asm_output_addr_vec_elt (STREAM, VALUE)
778 
 
779 
 
780 
/* Node: Exception Region Output */
781 
/* (empty) */
782 
 
783 
/* Node: Alignment Output */
784 
 
785 
#define ASM_OUTPUT_SKIP(STREAM, NBYTES) \
786 
 mmix_asm_output_skip (STREAM, NBYTES)
787 
 
788 
#define ASM_OUTPUT_ALIGN(STREAM, POWER) \
789 
 mmix_asm_output_align (STREAM, POWER)
790 
 
791 
 
792 
/* Node: All Debuggers */
793 
 
794 
#define DBX_REGISTER_NUMBER(REGNO) \
795 
 mmix_dbx_register_number (REGNO)
796 
 
797 
 
798 
/* Node: DBX Options */
799 
/* (empty) */
800 
/* Node: DBX Hooks */
801 
/* (empty) */
802 
/* Node: File Names and DBX */
803 
/* (empty) */
804 
 
805 
 
806 
/* Node: SDB and DWARF */
807 
#define DWARF2_DEBUGGING_INFO 1
808 
#define DWARF2_ASM_LINE_DEBUG_INFO 1
809 
 
810 
/* Node: Misc */
811 
 
812 
/* There's no way to get a PC-relative offset into tables for SImode, so
813 
   for the moment we have absolute entries in DImode.
814 
   When we're going ELF, these should be SImode and 1.  */
815 
#define CASE_VECTOR_MODE DImode
816 
#define CASE_VECTOR_PC_RELATIVE 0
817 
 
818 
#define WORD_REGISTER_OPERATIONS
819 
 
820 
/* We have a choice, which makes this yet another parameter to tweak.  The
821 
   gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent
822 
   than "unsigned int", and we have signed characters.  FIXME: measure.  */
823 
#define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND)
824 
 
825 
#define MOVE_MAX 8
826 
 
827 
#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
828 
 
829 
/* ??? MMIX allows a choice of STORE_FLAG_VALUE.  Revisit later,
830 
   we don't have scc expanders yet.  */
831 
 
832 
#define Pmode DImode
833 
 
834 
#define FUNCTION_MODE QImode
835 
 
836 
#define NO_IMPLICIT_EXTERN_C
837 
 
838 
/* These are checked.  */
839 
#define DOLLARS_IN_IDENTIFIERS 0
840 
#define NO_DOLLAR_IN_LABEL
841 
#define NO_DOT_IN_LABEL
842 
 
843 
#endif /* GCC_MMIX_H */
844 
/*
845 
 * Local variables:
846 
 * eval: (c-set-style "gnu")
847 
 * indent-tabs-mode: t
848 
 * End:
849 
 */

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