1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1996-2023 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC 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 3, or (at your option)
9 any later version.
10
11 GCC 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 GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
19
20 /* Alpha/VMS object format is not really Elf, but this makes compiling
21 crtstuff.c and dealing with shared library initialization much easier. */
22 #define OBJECT_FORMAT_ELF
23
24 /* Do not use TM clone registry as it currently doesn't work. Alpha/VMS
25 object is too far from ELF for supporting TM out of the box. */
26 #define USE_TM_CLONE_REGISTRY 0
27
28 /* This enables certain macros in alpha.h, which will make an indirect
29 reference to an external symbol an invalid address. This needs to be
30 defined before we include alpha.h, since it determines which macros
31 are used for GO_IF_*. */
32
33 #define NO_EXTERNAL_INDIRECT_ADDRESS
34
35 #define SUBTARGET_OS_CPP_BUILTINS() \
36 do { \
37 builtin_define ("__ALPHA"); \
38 if (TARGET_FLOAT_VAX) \
39 builtin_define ("__G_FLOAT"); \
40 else \
41 builtin_define ("__IEEE_FLOAT"); \
42 } while (0)
43
44 #undef PCC_STATIC_STRUCT_RETURN
45
46 #define MAX_OFILE_ALIGNMENT 524288 /* 8 x 2^16 by DEC Ada Test CD40VRA */
47
48 /* The maximum alignment 'malloc' honors. */
49 #undef MALLOC_ABI_ALIGNMENT
50 #define MALLOC_ABI_ALIGNMENT \
51 ((flag_vms_malloc64 && flag_vms_pointer_size != VMS_POINTER_SIZE_NONE \
52 ? 16 : 8) * BITS_PER_UNIT)
53
54 #undef FIXED_REGISTERS
55 #define FIXED_REGISTERS \
56 {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
58 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
60
61 #undef CALL_USED_REGISTERS
62 #define CALL_USED_REGISTERS \
63 {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
64 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \
65 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
66 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
67
68 /* List the order in which to allocate registers. Each register must be
69 listed once, even those in FIXED_REGISTERS.
70
71 We allocate in the following order:
72 $f1 (nonsaved floating-point register)
73 $f10-$f15 (likewise)
74 $f22-$f30 (likewise)
75 $f21-$f16 (likewise, but input args)
76 $f0 (nonsaved, but return value)
77 $f2-$f9 (saved floating-point registers)
78 $1 (nonsaved integer registers)
79 $22-$25 (likewise)
80 $28 (likewise)
81 $0 (likewise, but return value)
82 $21-$16 (likewise, but input args)
83 $27 (procedure value in OSF, nonsaved in NT)
84 $2-$8 (saved integer registers)
85 $9-$14 (saved integer registers)
86 $26 (return PC)
87 $15 (frame pointer)
88 $29 (global pointer)
89 $30, $31, $f31 (stack pointer and always zero/ap & fp) */
90
91 #undef REG_ALLOC_ORDER
92 #define REG_ALLOC_ORDER \
93 {33, \
94 42, 43, 44, 45, 46, 47, \
95 54, 55, 56, 57, 58, 59, 60, 61, 62, \
96 53, 52, 51, 50, 49, 48, \
97 32, \
98 34, 35, 36, 37, 38, 39, 40, 41, \
99 1, \
100 22, 23, 24, 25, \
101 28, \
102 0, \
103 21, 20, 19, 18, 17, 16, \
104 27, \
105 2, 3, 4, 5, 6, 7, 8, \
106 9, 10, 11, 12, 13, 14, \
107 26, \
108 15, \
109 29, \
110 30, 31, 63 }
111
112 #undef HARD_FRAME_POINTER_REGNUM
113 #define HARD_FRAME_POINTER_REGNUM 29
114
115 /* Define registers used by the epilogue and return instruction. */
116 #undef EPILOGUE_USES
117 #define EPILOGUE_USES(REGNO) ((REGNO) == 26 || (REGNO) == 29)
118
119 #undef INITIAL_ELIMINATION_OFFSET
120 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
121 ((OFFSET) = alpha_vms_initial_elimination_offset(FROM, TO))
122
123
124 /* Define a data type for recording info about an argument list
125 during the scan of that argument list. This data type should
126 hold all necessary information about the function itself
127 and about the args processed so far, enough to enable macros
128 such as FUNCTION_ARG to determine where the next arg should go.
129
130 On Alpha/VMS, this is a structure that contains the number of
131 arguments and, for each argument, the datatype of that argument.
132
133 The number of arguments is a number of words of arguments scanned so far.
134 Thus 6 or more means all following args should go on the stack. */
135
136 enum avms_arg_type {I64, FF, FD, FG, FS, FT};
137 typedef struct {int num_args; enum avms_arg_type atypes[6];} avms_arg_info;
138
139 #undef CUMULATIVE_ARGS
140 #define CUMULATIVE_ARGS avms_arg_info
141
142 /* Initialize a variable CUM of type CUMULATIVE_ARGS
143 for a call to a function whose data type is FNTYPE.
144 For a library call, FNTYPE is 0. */
145
146 #undef INIT_CUMULATIVE_ARGS
147 #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
148 do \
149 { \
150 (CUM).num_args = 0; \
151 (CUM).atypes[0] = (CUM).atypes[1] = (CUM).atypes[2] = I64; \
152 (CUM).atypes[3] = (CUM).atypes[4] = (CUM).atypes[5] = I64; \
153 } \
154 while (0)
155
156 #define DEFAULT_PCC_STRUCT_RETURN 0
157
158 /* Even though pointers are 64bits, only 32bit ever remain significant in code
159 addresses. */
160 #define MASK_RETURN_ADDR \
161 (flag_vms_pointer_size == VMS_POINTER_SIZE_NONE \
162 ? constm1_rtx \
163 : GEN_INT (0xffffffff))
164
165 #undef ASM_WEAKEN_LABEL
166 #define ASM_WEAKEN_LABEL(FILE, NAME) \
167 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
168 fputc ('\n', FILE); } while (0)
169
170 #define READONLY_DATA_SECTION_ASM_OP "\t.rdata"
171 #define CTORS_SECTION_ASM_OP "\t.ctors"
172 #define DTORS_SECTION_ASM_OP "\t.dtors"
173 #define SDATA_SECTION_ASM_OP "\t.sdata"
174 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
175 asm (SECTION_OP "\n\t.long " #FUNC"\n");
176
177 #undef ASM_OUTPUT_ADDR_DIFF_ELT
178
179 #undef ASM_OUTPUT_ADDR_VEC_ELT
180 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE) \
181 fprintf (FILE, "\t.quad $L%d\n", (VALUE))
182
183 #undef CASE_VECTOR_MODE
184 #define CASE_VECTOR_MODE DImode
185 #undef CASE_VECTOR_PC_RELATIVE
186
187 #undef ASM_OUTPUT_CASE_LABEL
188 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
189 { ASM_OUTPUT_ALIGN (FILE, 3); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
190
191 /* This says how to output assembler code to declare an
192 uninitialized external linkage data object. */
193
194 #define COMMON_ASM_OP "\t.comm\t"
195
196 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
197 #define ASM_OUTPUT_ALIGNED_DECL_COMMON(FILE, DECL, NAME, SIZE, ALIGN) \
198 vms_output_aligned_decl_common (FILE, DECL, NAME, SIZE, ALIGN)
199
200 /* Control how constructors and destructors are emitted. */
201 #define TARGET_ASM_CONSTRUCTOR vms_asm_out_constructor
202 #define TARGET_ASM_DESTRUCTOR vms_asm_out_destructor
203
204 #define DWARF2_DEBUGGING_INFO 1
205 #define VMS_DEBUGGING_INFO 1
206
207 #define DWARF2_UNWIND_INFO 1
208
209 #undef EH_RETURN_HANDLER_RTX
210 #define EH_RETURN_HANDLER_RTX \
211 gen_rtx_MEM (Pmode, plus_constant (Pmode, stack_pointer_rtx, 8))
212
213 #define LINK_EH_SPEC "vms-dwarf2eh.o%s "
214 #define LINK_GCC_C_SEQUENCE_SPEC "%G"
215
216 /* This is how to output an assembler line
217 that says to advance the location counter
218 to a multiple of 2**LOG bytes. */
219
220 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
221 fprintf (FILE, "\t.align %d\n", LOG);
222
223 /* This is how to advance the location counter by SIZE bytes. */
224
225 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
226 fprintf (FILE, "\t.space " HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE))
227
228 /* This says how to output an assembler line
229 to define a global common symbol. */
230
231 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED) \
232 ( fputs ("\t.lcomm ", (FILE)), \
233 assemble_name ((FILE), (NAME)), \
234 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)))
235
236 /* Switch into a generic section. */
237 #define TARGET_ASM_NAMED_SECTION vms_asm_named_section
238
239 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
240 do \
241 { \
242 fprintf ((FILE), "\t"); \
243 assemble_name (FILE, LABEL1); \
244 fprintf (FILE, " = "); \
245 assemble_name (FILE, LABEL2); \
246 fprintf (FILE, "\n"); \
247 } \
248 while (0)
249
250 #undef PREFERRED_DEBUGGING_TYPE
251 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
252
253 #define ASM_PN_FORMAT "%s___%lu"
254
255 /* ??? VMS uses different linkage. */
256 #undef TARGET_ASM_OUTPUT_MI_THUNK
257
258 #undef ASM_SPEC
259 #undef ASM_FINAL_SPEC
260
261 /* The VMS convention is to always provide minimal debug info
262 for a traceback unless specifically overridden.
263
264 Because ASM_OUTPUT_ADDR_DIFF_ELT is not defined for alpha-vms,
265 jump tables cannot be output for PIC code, because you can't put
266 an absolute address in a readonly section. Putting the table in
267 a writable section is a security hole. Therefore, we unset the
268 flag_jump_tables flag, forcing switch statements to be expanded
269 using decision trees. There are probably other ways to address
270 this issue, but using a decision tree is clearly safe. */
271
272 #undef SUBTARGET_OVERRIDE_OPTIONS
273 #define SUBTARGET_OVERRIDE_OPTIONS \
274 do { \
275 if (write_symbols == NO_DEBUG \
276 && debug_info_level == DINFO_LEVEL_NONE) \
277 { \
278 write_symbols = VMS_DEBUG; \
279 debug_info_level = DINFO_LEVEL_TERSE; \
280 } \
281 if (flag_pic) \
282 flag_jump_tables = 0; \
283 } while (0)
284
285 #undef LINK_SPEC
286 #if HAVE_GNU_LD
287 /* GNU-ld built-in linker script already handles the dwarf2 debug sections. */
288 #define LINK_SPEC "%{shared} %{v}"
289 #else
290 /* Link with vms-dwarf2.o if -g (except -g0). This causes the
291 VMS link to pull all the dwarf2 debug sections together. */
292 #define LINK_SPEC "%{g0} %{g*:-g vms-dwarf2.o%s} %{shared} %{v} %{map}"
293 #endif
294
295 #undef STARTFILE_SPEC
296 #define STARTFILE_SPEC "%{!shared:crt0.o%s crtbegin.o%s} \
297 %{!static:%{shared:crtbeginS.o%s}}"
298
299 #define ENDFILE_SPEC "%{!shared:crtend.o%s} %{!static:%{shared:crtendS.o%s}}"
300
301 #define INIT_SECTION_ASM_OP "\t.section LIB$INITIALIZE,GBL,NOWRT"
302
303 #define LONGLONG_STANDALONE 1
304
305 #undef TARGET_VALID_POINTER_MODE
306 #define TARGET_VALID_POINTER_MODE vms_valid_pointer_mode
307
308 /* Default values for _CRTL_VER and _VMS_VER. */
309 #define VMS_DEFAULT_CRTL_VER 70320000
310 #define VMS_DEFAULT_VMS_VER 70320000