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1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #define TARGET_OBJECT_SUFFIX ".obj"
23 #define TARGET_EXECUTABLE_SUFFIX ".exe"
25 /* This enables certain macros in alpha.h, which will make an indirect
26 reference to an external symbol an invalid address. This needs to be
27 defined before we include alpha.h, since it determines which macros
28 are used for GO_IF_*. */
30 #define NO_EXTERNAL_INDIRECT_ADDRESS
32 #define TARGET_OS_CPP_BUILTINS() \
34 builtin_define_std ("vms"); \
35 builtin_define_std ("VMS"); \
36 builtin_define ("__ALPHA"); \
37 builtin_assert ("system=vms"); \
38 if (TARGET_FLOAT_VAX) \
39 builtin_define ("__G_FLOAT"); \
41 builtin_define ("__IEEE_FLOAT"); \
45 #define TARGET_DEFAULT (MASK_FP|MASK_FPREGS|MASK_GAS)
46 #undef TARGET_ABI_OPEN_VMS
47 #define TARGET_ABI_OPEN_VMS 1
50 #define TARGET_NAME "OpenVMS/Alpha"
52 #define TARGET_VERSION fprintf (stderr, " (%s)", TARGET_NAME);
54 #undef PCC_STATIC_STRUCT_RETURN
56 /* "long" is 32 bits, but 64 bits for Ada. */
58 #define LONG_TYPE_SIZE 32
59 #define ADA_LONG_TYPE_SIZE 64
61 /* Pointer is 32 bits but the hardware has 64-bit addresses, sign extended. */
63 #define POINTER_SIZE 32
64 #define POINTERS_EXTEND_UNSIGNED 0
66 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */
68 #undef FIXED_REGISTERS
69 #define FIXED_REGISTERS \
70 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
71 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
72 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
73 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
75 #undef CALL_USED_REGISTERS
76 #define CALL_USED_REGISTERS \
77 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
78 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
79 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
80 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
82 /* List the order in which to allocate registers. Each register must be
83 listed once, even those in FIXED_REGISTERS.
85 We allocate in the following order:
86 $f1 (nonsaved floating-point register)
89 $f21-$f16 (likewise, but input args)
90 $f0 (nonsaved, but return value)
91 $f2-$f9 (saved floating-point registers)
92 $1 (nonsaved integer registers)
95 $0 (likewise, but return value)
96 $21-$16 (likewise, but input args)
97 $27 (procedure value in OSF, nonsaved in NT)
98 $2-$8 (saved integer registers)
99 $9-$14 (saved integer registers)
103 $30, $31, $f31 (stack pointer and always zero/ap & fp) */
105 #undef REG_ALLOC_ORDER
106 #define REG_ALLOC_ORDER \
108 42, 43, 44, 45, 46, 47, \
109 54, 55, 56, 57, 58, 59, 60, 61, 62, \
110 53, 52, 51, 50, 49, 48, \
112 34, 35, 36, 37, 38, 39, 40, 41, \
117 21, 20, 19, 18, 17, 16, \
119 2, 3, 4, 5, 6, 7, 8, \
120 9, 10, 11, 12, 13, 14, \
126 #undef HARD_FRAME_POINTER_REGNUM
127 #define HARD_FRAME_POINTER_REGNUM 29
129 /* Define registers used by the epilogue and return instruction. */
131 #define EPILOGUE_USES(REGNO) ((REGNO) == 26 || (REGNO) == 29)
134 #define CAN_ELIMINATE(FROM, TO) \
135 ((TO) != STACK_POINTER_REGNUM || ! alpha_using_fp ())
137 #undef INITIAL_ELIMINATION_OFFSET
138 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
139 { if ((FROM) == FRAME_POINTER_REGNUM) \
140 (OFFSET) = alpha_sa_size () + alpha_pv_save_size (); \
141 else if ((FROM) == ARG_POINTER_REGNUM) \
142 (OFFSET) = (ALPHA_ROUND (alpha_sa_size () + alpha_pv_save_size () \
143 + get_frame_size () \
144 + current_function_pretend_args_size) \
145 - current_function_pretend_args_size); \
148 if ((TO) == STACK_POINTER_REGNUM) \
149 (OFFSET) += ALPHA_ROUND (current_function_outgoing_args_size); \
152 /* Define a data type for recording info about an argument list
153 during the scan of that argument list. This data type should
154 hold all necessary information about the function itself
155 and about the args processed so far, enough to enable macros
156 such as FUNCTION_ARG to determine where the next arg should go.
158 On Alpha/VMS, this is a structure that contains the number of
159 arguments and, for each argument, the datatype of that argument.
161 The number of arguments is a number of words of arguments scanned so far.
162 Thus 6 or more means all following args should go on the stack. */
164 enum avms_arg_type
{I64
, FF
, FD
, FG
, FS
, FT
};
165 typedef struct {int num_args
; enum avms_arg_type atypes
[6];} avms_arg_info
;
167 #undef CUMULATIVE_ARGS
168 #define CUMULATIVE_ARGS avms_arg_info
170 /* Initialize a variable CUM of type CUMULATIVE_ARGS
171 for a call to a function whose data type is FNTYPE.
172 For a library call, FNTYPE is 0. */
174 #undef INIT_CUMULATIVE_ARGS
175 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT) \
176 (CUM).num_args = 0; \
177 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
178 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64;
180 #undef FUNCTION_ARG_ADVANCE
181 #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED) \
182 if (MUST_PASS_IN_STACK (MODE, TYPE)) \
183 (CUM).num_args += 6; \
186 if ((CUM).num_args < 6) \
187 (CUM).atypes[(CUM).num_args] = alpha_arg_type (MODE); \
189 (CUM).num_args += ALPHA_ARG_SIZE (MODE, TYPE, NAMED); \
192 /* For an arg passed partly in registers and partly in memory,
193 this is the number of registers used.
194 For args passed entirely in registers or entirely in memory, zero. */
196 #undef FUNCTION_ARG_PARTIAL_NREGS
197 #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
198 ((CUM).num_args < 6 && 6 < (CUM).num_args \
199 + ALPHA_ARG_SIZE (MODE, TYPE, NAMED) \
200 ? 6 - (CUM).num_args : 0)
202 /* ABI has stack checking, but it's broken. */
203 #undef STACK_CHECK_BUILTIN
204 #define STACK_CHECK_BUILTIN 0
206 #define LINK_SECTION_ASM_OP "\t.link"
207 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
208 #define LITERALS_SECTION_ASM_OP "\t.literals"
209 #define CTORS_SECTION_ASM_OP "\t.ctors"
210 #define DTORS_SECTION_ASM_OP "\t.dtors"
212 #undef EXTRA_SECTIONS
213 #define EXTRA_SECTIONS in_link, in_literals
215 #undef EXTRA_SECTION_FUNCTIONS
216 #define EXTRA_SECTION_FUNCTIONS \
218 link_section (void) \
220 if (in_section != in_link) \
222 fprintf (asm_out_file, "%s\n", LINK_SECTION_ASM_OP); \
223 in_section = in_link; \
227 literals_section (void) \
229 if (in_section != in_literals) \
231 fprintf (asm_out_file, "%s\n", LITERALS_SECTION_ASM_OP); \
232 in_section = in_literals; \
236 extern void link_section (void);
237 extern void literals_section (void);
239 #undef ASM_OUTPUT_ADDR_DIFF_ELT
240 #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) abort ()
242 #undef ASM_OUTPUT_ADDR_VEC_ELT
243 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
244 fprintf (FILE, "\t.quad $L%d\n", (VALUE))
246 #undef CASE_VECTOR_MODE
247 #define CASE_VECTOR_MODE DImode
248 #undef CASE_VECTOR_PC_RELATIVE
250 #undef ASM_OUTPUT_CASE_LABEL
251 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
252 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
254 /* This says how to output assembler code to declare an
255 uninitialized external linkage data object. */
257 #define COMMON_ASM_OP "\t.comm\t"
259 #undef ASM_OUTPUT_ALIGNED_COMMON
260 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
262 fprintf ((FILE), "%s", COMMON_ASM_OP); \
263 assemble_name ((FILE), (NAME)); \
264 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
268 /* Output assembler code for a block containing the constant parts
269 of a trampoline, leaving space for the variable parts.
271 The trampoline should set the static chain pointer to value placed
272 into the trampoline and should branch to the specified routine.
273 Note that $27 has been set to the address of the trampoline, so we can
274 use it for addressability of the two data items. */
276 #undef TRAMPOLINE_TEMPLATE
277 #define TRAMPOLINE_TEMPLATE(FILE) \
279 fprintf (FILE, "\t.quad 0\n"); \
280 fprintf (FILE, "\t.linkage __tramp\n"); \
281 fprintf (FILE, "\t.quad 0\n"); \
284 /* Length in units of the trampoline for entering a nested function. */
286 #undef TRAMPOLINE_SIZE
287 #define TRAMPOLINE_SIZE 32
289 /* The alignment of a trampoline, in bits. */
291 #undef TRAMPOLINE_ALIGNMENT
292 #define TRAMPOLINE_ALIGNMENT 64
294 /* Emit RTL insns to initialize the variable parts of a trampoline.
295 FNADDR is an RTX for the address of the function's pure code.
296 CXT is an RTX for the static chain value for the function. */
298 #undef INITIALIZE_TRAMPOLINE
299 #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
300 alpha_initialize_trampoline (TRAMP, FNADDR, CXT, 16, 24, -1)
302 /* Control how constructors and destructors are emitted. */
303 #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor
304 #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor
306 #undef SDB_DEBUGGING_INFO
307 #undef MIPS_DEBUGGING_INFO
308 #undef DBX_DEBUGGING_INFO
310 #define DWARF2_DEBUGGING_INFO 1
311 #define VMS_DEBUGGING_INFO 1
313 #define DWARF2_UNWIND_INFO 1
315 #undef EH_RETURN_HANDLER_RTX
316 #define EH_RETURN_HANDLER_RTX \
317 gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx, 8))
319 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
324 #define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
326 PDSCDEF *pv = *((PDSCDEF **) (CONTEXT)->reg [29]); \
328 if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */ \
329 pv = *(PDSCDEF **) pv; \
331 if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK)) \
335 (FS)->cfa_offset = pv->pdsc$l_size; \
336 (FS)->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30; \
337 (FS)->retaddr_column = 26; \
338 (FS)->cfa_how = CFA_REG_OFFSET; \
339 (FS)->regs.reg[27].loc.offset = -pv->pdsc$l_size; \
340 (FS)->regs.reg[27].how = REG_SAVED_OFFSET; \
341 (FS)->regs.reg[26].loc.offset \
342 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset); \
343 (FS)->regs.reg[26].how = REG_SAVED_OFFSET; \
345 for (i = 0, j = 0; i < 32; i++) \
346 if (1<<i & pv->pdsc$l_ireg_mask) \
348 (FS)->regs.reg[i].loc.offset \
349 = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j); \
350 (FS)->regs.reg[i].how = REG_SAVED_OFFSET; \
355 else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER)) \
357 (FS)->cfa_offset = pv->pdsc$l_size; \
358 (FS)->cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30; \
359 (FS)->retaddr_column = 26; \
360 (FS)->cfa_how = CFA_REG_OFFSET; \
361 (FS)->regs.reg[26].loc.reg = pv->pdsc$b_save_ra; \
362 (FS)->regs.reg[26].how = REG_SAVED_REG; \
363 (FS)->regs.reg[29].loc.reg = pv->pdsc$b_save_fp; \
364 (FS)->regs.reg[29].how = REG_SAVED_REG; \
371 /* This is how to output an assembler line
372 that says to advance the location counter
373 to a multiple of 2**LOG bytes. */
375 #undef ASM_OUTPUT_ALIGN
376 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
377 fprintf (FILE, "\t.align %d\n", LOG);
379 /* Switch into a generic section. */
380 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
382 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
383 do { literals_section(); \
384 fprintf ((FILE), "\t"); \
385 assemble_name (FILE, LABEL1); \
386 fprintf (FILE, " = "); \
387 assemble_name (FILE, LABEL2); \
388 fprintf (FILE, "\n"); \
391 #undef PREFERRED_DEBUGGING_TYPE
392 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
394 #define ASM_PN_FORMAT "%s___%lu"
396 /* ??? VMS uses different linkage. */
397 #undef TARGET_ASM_OUTPUT_MI_THUNK
400 #undef ASM_FINAL_SPEC
402 /* The VMS convention is to always provide minimal debug info
403 for a traceback unless specifically overridden. Defaulting this here
406 #define OPTIMIZATION_OPTIONS(OPTIMIZE, OPTIMIZE_SIZE) \
408 write_symbols = VMS_DEBUG; \
409 debug_info_level = (enum debug_info_level) 1; \
412 /* Override traceback debug info on -g0. */
413 #undef OVERRIDE_OPTIONS
414 #define OVERRIDE_OPTIONS \
416 if (write_symbols == NO_DEBUG) \
417 debug_info_level = (enum debug_info_level) 0; \
418 override_options (); \
421 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
422 VMS link to pull all the dwarf2 debug sections together. */
424 #define LINK_SPEC "%{g:-g vms-dwarf2.o%s} %{g0} %{g1:-g1 vms-dwarf2.o%s} \
425 %{g2:-g2 vms-dwarf2.o%s} %{g3:-g3 vms-dwarf2.o%s} %{shared} %{v} %{map}"
427 #undef STARTFILE_SPEC
428 #define STARTFILE_SPEC "%{!shared:%{mvms-return-codes:vcrt0.o%s} \
429 %{!mvms-return-codes:pcrt0.o%s}}"
432 #define LIB_SPEC "-lc"
434 #define NAME__MAIN "__gccmain"
435 #define SYMBOL__MAIN __gccmain
437 #define MD_EXEC_PREFIX "/gnu/lib/gcc-lib/"
438 #define MD_STARTFILE_PREFIX "/gnu/lib/gcc-lib/"
440 /* Specify the list of include file directories. */
441 #define INCLUDE_DEFAULTS \
443 { "/gnu/lib/gcc-lib/include", 0, 0, 0 }, \
444 { "/gnu_gxx_include", 0, 1, 1 }, \
445 { "/gnu_cc_include", 0, 0, 0 }, \
446 { "/gnu/include", 0, 0, 0 }, \
450 #define LONGLONG_STANDALONE 1