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[gcc.git] / gcc / config / alpha / vms.h
1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2004, 2005, 2007, 2008,
3 2009
4 Free Software Foundation, Inc.
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 #define TARGET_OBJECT_SUFFIX ".obj"
23 #define TARGET_EXECUTABLE_SUFFIX ".exe"
24
25 /* Alpha/VMS object format is not really Elf, but this makes compiling
26 crtstuff.c and dealing with shared library initialization much easier. */
27 #define OBJECT_FORMAT_ELF
28
29 /* This enables certain macros in alpha.h, which will make an indirect
30 reference to an external symbol an invalid address. This needs to be
31 defined before we include alpha.h, since it determines which macros
32 are used for GO_IF_*. */
33
34 #define NO_EXTERNAL_INDIRECT_ADDRESS
35
36 #define TARGET_OS_CPP_BUILTINS() \
37 do { \
38 builtin_define_std ("vms"); \
39 builtin_define_std ("VMS"); \
40 builtin_define ("__ALPHA"); \
41 builtin_assert ("system=vms"); \
42 if (TARGET_FLOAT_VAX) \
43 builtin_define ("__G_FLOAT"); \
44 else \
45 builtin_define ("__IEEE_FLOAT"); \
46 } while (0)
47
48 #undef TARGET_DEFAULT
49 #define TARGET_DEFAULT (MASK_FPREGS|MASK_GAS)
50 #undef TARGET_ABI_OPEN_VMS
51 #define TARGET_ABI_OPEN_VMS 1
52
53 #undef TARGET_NAME
54 #define TARGET_NAME "OpenVMS/Alpha"
55 #undef TARGET_VERSION
56 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME);
57
58 #define VMS_DEBUG_MAIN_POINTER "TRANSFER$BREAK$GO"
59
60 #undef PCC_STATIC_STRUCT_RETURN
61
62 /* "long" is 32 bits, but 64 bits for Ada. */
63 #undef LONG_TYPE_SIZE
64 #define LONG_TYPE_SIZE 32
65 #define ADA_LONG_TYPE_SIZE 64
66
67 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */
68 #undef POINTER_SIZE
69 #define POINTER_SIZE 32
70 #define POINTERS_EXTEND_UNSIGNED 0
71
72 #define HANDLE_SYSV_PRAGMA 1
73
74 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */
75
76 /* The maximum alignment 'malloc' honors. */
77 #undef MALLOC_ALIGNMENT
78 #define MALLOC_ALIGNMENT ((TARGET_MALLOC64 ? 16 : 8) * BITS_PER_UNIT)
79
80 #undef FIXED_REGISTERS
81 #define FIXED_REGISTERS \
82 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
83 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
84 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
85 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
86
87 #undef CALL_USED_REGISTERS
88 #define CALL_USED_REGISTERS \
89 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
90 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
91 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
92 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
93
94 /* List the order in which to allocate registers. Each register must be
95 listed once, even those in FIXED_REGISTERS.
96
97 We allocate in the following order:
98 $f1 (nonsaved floating-point register)
99 $f10-$f15 (likewise)
100 $f22-$f30 (likewise)
101 $f21-$f16 (likewise, but input args)
102 $f0 (nonsaved, but return value)
103 $f2-$f9 (saved floating-point registers)
104 $1 (nonsaved integer registers)
105 $22-$25 (likewise)
106 $28 (likewise)
107 $0 (likewise, but return value)
108 $21-$16 (likewise, but input args)
109 $27 (procedure value in OSF, nonsaved in NT)
110 $2-$8 (saved integer registers)
111 $9-$14 (saved integer registers)
112 $26 (return PC)
113 $15 (frame pointer)
114 $29 (global pointer)
115 $30, $31, $f31 (stack pointer and always zero/ap & fp) */
116
117 #undef REG_ALLOC_ORDER
118 #define REG_ALLOC_ORDER \
119 {33, \
120 42, 43, 44, 45, 46, 47, \
121 54, 55, 56, 57, 58, 59, 60, 61, 62, \
122 53, 52, 51, 50, 49, 48, \
123 32, \
124 34, 35, 36, 37, 38, 39, 40, 41, \
125 1, \
126 22, 23, 24, 25, \
127 28, \
128 0, \
129 21, 20, 19, 18, 17, 16, \
130 27, \
131 2, 3, 4, 5, 6, 7, 8, \
132 9, 10, 11, 12, 13, 14, \
133 26, \
134 15, \
135 29, \
136 30, 31, 63 }
137
138 #undef HARD_FRAME_POINTER_REGNUM
139 #define HARD_FRAME_POINTER_REGNUM 29
140
141 /* Define registers used by the epilogue and return instruction. */
142 #undef EPILOGUE_USES
143 #define EPILOGUE_USES(REGNO) ((REGNO) == 26 || (REGNO) == 29)
144
145 #undef INITIAL_ELIMINATION_OFFSET
146 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
147 ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
148
149 \f
150 /* Define a data type for recording info about an argument list
151 during the scan of that argument list. This data type should
152 hold all necessary information about the function itself
153 and about the args processed so far, enough to enable macros
154 such as FUNCTION_ARG to determine where the next arg should go.
155
156 On Alpha/VMS, this is a structure that contains the number of
157 arguments and, for each argument, the datatype of that argument.
158
159 The number of arguments is a number of words of arguments scanned so far.
160 Thus 6 or more means all following args should go on the stack. */
161
162 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
163 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
164
165 #undef CUMULATIVE_ARGS
166 #define CUMULATIVE_ARGS avms_arg_info
167
168 /* Initialize a variable CUM of type CUMULATIVE_ARGS
169 for a call to a function whose data type is FNTYPE.
170 For a library call, FNTYPE is 0. */
171
172 #undef INIT_CUMULATIVE_ARGS
173 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
174 (CUM).num_args = 0; \
175 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
176 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
177
178 #undef FUNCTION_ARG_ADVANCE
179 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
180 if (targetm.calls.must_pass_in_stack (MODE, TYPE)) \
181 (CUM).num_args += 6; \
182 else \
183 { \
184 if ((CUM).num_args < 6) \
185 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \
186 \
187 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \
188 }
189
190 #define DEFAULT_PCC_STRUCT_RETURN 0
191
192 #undef ASM_WEAKEN_LABEL
193 #define ASM_WEAKEN_LABEL(FILE, NAME) \
194 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
195 fputc ('\n', FILE); } while (0)
196
197 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
198 #define CTORS_SECTION_ASM_OP "\t.ctors"
199 #define DTORS_SECTION_ASM_OP "\t.dtors"
200 #define SDATA_SECTION_ASM_OP "\t.sdata"
201 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
202 asm (SECTION_OP "\n\t.long " #FUNC"\n");
203
204 #undef ASM_OUTPUT_ADDR_DIFF_ELT
205 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) gcc_unreachable ()
206
207 #undef ASM_OUTPUT_ADDR_VEC_ELT
208 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
209 fprintf (FILE, "\t.quad $L%d\n", (VALUE))
210
211 #undef CASE_VECTOR_MODE
212 #define CASE_VECTOR_MODE DImode
213 #undef CASE_VECTOR_PC_RELATIVE
214
215 #undef ASM_OUTPUT_CASE_LABEL
216 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
217 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
218
219 /* This says how to output assembler code to declare an
220 uninitialized external linkage data object. */
221
222 #define COMMON_ASM_OP "\t.comm\t"
223
224 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
225 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
226 vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
227 \f
228 /* Control how constructors and destructors are emitted. */
229 #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor
230 #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor
231
232 #undef SDB_DEBUGGING_INFO
233 #undef MIPS_DEBUGGING_INFO
234 #undef DBX_DEBUGGING_INFO
235
236 #define DWARF2_DEBUGGING_INFO 1
237 #define VMS_DEBUGGING_INFO 1
238
239 #define DWARF2_UNWIND_INFO 1
240
241 #undef EH_RETURN_HANDLER_RTX
242 #define EH_RETURN_HANDLER_RTX \
243 gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
244
245 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
246 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
247
248 #ifdef IN_LIBGCC2
249 /* Get the definition for MD_FALLBACK_FRAME_STATE_FOR from a separate
250 file. This avoids having to recompile the world instead of libgcc only
251 when changes to this macro are exercised. */
252
253 #define MD_UNWIND_SUPPORT "config/alpha/vms-unwind.h"
254 #endif
255
256 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
257 avms_asm_output_external (FILE, DECL, NAME)
258
259 typedef struct crtl_name_spec
260 {
261 const char *const name;
262 const char *deccname;
263 int referenced;
264 } crtl_name_spec;
265
266 #include "config/vms/vms-crtl.h"
267
268 /* Alias CRTL names to 32/64bit DECCRTL functions.
269 Fixme: This should do a binary search. */
270 #define DO_CRTL_NAMES \
271 do \
272 { \
273 int i; \
274 static crtl_name_spec vms_crtl_names[] = CRTL_NAMES; \
275 static int malloc64_init = 0; \
276 \
277 if ((malloc64_init == 0) && TARGET_MALLOC64) \
278 { \
279 for (i=0; vms_crtl_names [i].name; i++) \
280 { \
281 if (strcmp ("calloc", vms_crtl_names [i].name) == 0) \
282 vms_crtl_names [i].deccname = "decc$_calloc64"; \
283 else \
284 if (strcmp ("malloc", vms_crtl_names [i].name) == 0) \
285 vms_crtl_names [i].deccname = "decc$_malloc64"; \
286 else \
287 if (strcmp ("realloc", vms_crtl_names [i].name) == 0) \
288 vms_crtl_names [i].deccname = "decc$_realloc64"; \
289 else \
290 if (strcmp ("strdup", vms_crtl_names [i].name) == 0) \
291 vms_crtl_names [i].deccname = "decc$_strdup64"; \
292 } \
293 malloc64_init = 1; \
294 } \
295 for (i=0; vms_crtl_names [i].name; i++) \
296 if (!vms_crtl_names [i].referenced && \
297 (strcmp (name, vms_crtl_names [i].name) == 0)) \
298 { \
299 fprintf (file, "\t%s=%s\n", \
300 name, vms_crtl_names [i].deccname); \
301 vms_crtl_names [i].referenced = 1; \
302 } \
303 } while (0)
304
305 /* This is how to output an assembler line
306 that says to advance the location counter
307 to a multiple of 2**LOG bytes. */
308
309 #undef ASM_OUTPUT_ALIGN
310 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
311 fprintf (FILE, "\t.align %d\n", LOG);
312
313 /* Switch into a generic section. */
314 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
315
316 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
317 do { fprintf ((FILE), "\t.literals\n"); \
318 in_section = NULL; \
319 fprintf ((FILE), "\t"); \
320 assemble_name (FILE, LABEL1); \
321 fprintf (FILE, " = "); \
322 assemble_name (FILE, LABEL2); \
323 fprintf (FILE, "\n"); \
324 } while (0)
325
326 #undef PREFERRED_DEBUGGING_TYPE
327 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
328
329 #define ASM_PN_FORMAT "%s___%lu"
330
331 /* ??? VMS uses different linkage. */
332 #undef TARGET_ASM_OUTPUT_MI_THUNK
333
334 #undef ASM_SPEC
335 #undef ASM_FINAL_SPEC
336
337 /* The VMS convention is to always provide minimal debug info
338 for a traceback unless specifically overridden. */
339
340 #undef OVERRIDE_OPTIONS
341 #define OVERRIDE_OPTIONS \
342 { \
343 if (write_symbols == NO_DEBUG \
344 && debug_info_level == DINFO_LEVEL_NONE) \
345 { \
346 write_symbols = VMS_DEBUG; \
347 debug_info_level = DINFO_LEVEL_TERSE; \
348 } \
349 override_options (); \
350 }
351
352 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
353 VMS link to pull all the dwarf2 debug sections together. */
354 #undef LINK_SPEC
355 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
356 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
357
358 #undef STARTFILE_SPEC
359 #define STARTFILE_SPEC \
360 "%{!shared:%{mvms-return-codes:vcrt0.o%s} %{!mvms-return-codes:pcrt0.o%s} \
361 crtbegin.o%s} \
362 %{!static:%{shared:crtbeginS.o%s}}"
363
364 #define ENDFILE_SPEC \
365 "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
366
367 #define NAME__MAIN "__gccmain"
368 #define SYMBOL__MAIN __gccmain
369
370 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
371
372 #define LONGLONG_STANDALONE 1
373
374 #undef TARGET_VALID_POINTER_MODE
375 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode