1 /* Definitions of target machine for GNU compiler,
2 for some generic XCOFF file format
3 Copyright (C) 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC 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 GNU CC 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 GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #define TARGET_OBJECT_FORMAT OBJECT_XCOFF
25 /* The RS/6000 uses the XCOFF format. */
26 #define XCOFF_DEBUGGING_INFO
28 /* Define if the object format being used is COFF or a superset. */
29 #define OBJECT_FORMAT_COFF
31 /* Define the magic numbers that we recognize as COFF.
33 AIX 4.3 adds U803XTOCMAGIC (0757) for 64-bit objects and AIX V5 adds
34 U64_TOCMAGIC (0767), but collect2.c does not include files in the
35 correct order to conditionally define the symbolic name in this macro.
37 The AIX linker accepts import/export files as object files,
38 so accept "#!" (0x2321) magic number. */
39 #define MY_ISCOFF(magic) \
40 ((magic) == U802WRMAGIC || (magic) == U802ROMAGIC \
41 || (magic) == U802TOCMAGIC || (magic) == 0757 || (magic) == 0767 \
44 /* We don't have GAS for the RS/6000 yet, so don't write out special
47 #define FASCIST_ASSEMBLER
49 /* We define this to prevent the name mangler from putting dollar signs into
52 #define NO_DOLLAR_IN_LABEL
54 /* We define this to 0 so that gcc will never accept a dollar sign in a
55 variable name. This is needed because the AIX assembler will not accept
58 #define DOLLARS_IN_IDENTIFIERS 0
60 /* Define the extra sections we need. We define three: one is the read-only
61 data section which is used for constants. This is a csect whose name is
62 derived from the name of the input file. The second is for initialized
63 global variables. This is a csect whose name is that of the variable.
64 The third is the TOC. */
66 #define EXTRA_SECTIONS \
67 read_only_data, private_data, read_only_private_data, toc, bss
69 /* Define the routines to implement these extra sections.
70 BIGGEST_ALIGNMENT is 64, so align the sections that much. */
72 #define EXTRA_SECTION_FUNCTIONS \
75 read_only_data_section () \
77 if (in_section != read_only_data) \
79 fprintf (asm_out_file, "\t.csect %s[RO],3\n", \
80 xcoff_read_only_section_name); \
81 in_section = read_only_data; \
86 private_data_section () \
88 if (in_section != private_data) \
90 fprintf (asm_out_file, "\t.csect %s[RW],3\n", \
91 xcoff_private_data_section_name); \
92 in_section = private_data; \
97 read_only_private_data_section () \
99 if (in_section != read_only_private_data) \
101 fprintf (asm_out_file, "\t.csect %s[RO],3\n", \
102 xcoff_private_data_section_name); \
103 in_section = read_only_private_data; \
110 if (TARGET_MINIMAL_TOC) \
112 /* toc_section is always called at least once from ASM_FILE_START, \
113 so this is guaranteed to always be defined once and only once \
115 if (! toc_initialized) \
117 fputs ("\t.toc\nLCTOC..1:\n", asm_out_file); \
118 fputs ("\t.tc toc_table[TC],toc_table[RW]\n", asm_out_file); \
119 toc_initialized = 1; \
122 if (in_section != toc) \
123 fprintf (asm_out_file, "\t.csect toc_table[RW]%s\n", \
124 (TARGET_32BIT ? "" : ",3")); \
128 if (in_section != toc) \
129 fputs ("\t.toc\n", asm_out_file); \
134 /* Define the name of our readonly data section. */
136 #define READONLY_DATA_SECTION read_only_data_section
138 #define TARGET_ASM_SELECT_SECTION rs6000_xcoff_select_section
140 /* Return non-zero if this entry is to be written into the constant
141 pool in a special way. We do so if this is a SYMBOL_REF, LABEL_REF
142 or a CONST containing one of them. If -mfp-in-toc (the default),
143 we also do this for floating-point constants. We actually can only
144 do this if the FP formats of the target and host machines are the
145 same, but we can't check that since not every file that uses
146 GO_IF_LEGITIMATE_ADDRESS_P includes real.h. We also do this when
147 we can write the entry into the TOC and the entry is not larger
150 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) \
152 && (GET_CODE (X) == SYMBOL_REF \
153 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
154 && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF) \
155 || GET_CODE (X) == LABEL_REF \
156 || (GET_CODE (X) == CONST_INT \
157 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \
158 || (GET_CODE (X) == CONST_DOUBLE \
159 && (TARGET_POWERPC64 \
160 || TARGET_MINIMAL_TOC \
161 || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT \
162 && ! TARGET_NO_FP_IN_TOC)))))
164 #define TARGET_ASM_SELECT_RTX_SECTION rs6000_xcoff_select_rtx_section
165 #define TARGET_ENCODE_SECTION_INFO rs6000_xcoff_encode_section_info
166 #define TARGET_STRIP_NAME_ENCODING rs6000_xcoff_strip_name_encoding
168 /* FP save and restore routines. */
169 #define SAVE_FP_PREFIX "._savef"
170 #define SAVE_FP_SUFFIX ""
171 #define RESTORE_FP_PREFIX "._restf"
172 #define RESTORE_FP_SUFFIX ""
174 /* Function name to call to do profiling. */
176 #define RS6000_MCOUNT ".__mcount"
178 /* Function names to call to do floating point truncation. */
181 #define RS6000_ITRUNC "__itrunc"
182 #undef RS6000_UITRUNC
183 #define RS6000_UITRUNC "__uitrunc"
185 /* This outputs NAME to FILE up to the first null or '['. */
187 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
188 assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
190 /* This is how to output the definition of a user-level label named NAME,
191 such as the label on a static function or variable NAME. */
193 #define ASM_OUTPUT_LABEL(FILE,NAME) \
194 do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
196 /* This is how to output a command to make the user-level label named NAME
197 defined for reference from other files. */
199 #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
200 do { fputs ("\t.globl ", FILE); \
201 RS6000_OUTPUT_BASENAME (FILE, NAME); putc ('\n', FILE);} while (0)
203 /* Output at beginning of assembler file.
205 Initialize the section names for the RS/6000 at this point.
207 Specify filename, including full path, to assembler.
209 We want to go into the TOC section so at least one .toc will be emitted.
210 Also, in order to output proper .bs/.es pairs, we need at least one static
211 [RW] section emitted.
213 Finally, declare mcount when profiling to make the assembler happy. */
215 #define ASM_FILE_START(FILE) \
217 rs6000_gen_section_name (&xcoff_bss_section_name, \
218 main_input_filename, ".bss_"); \
219 rs6000_gen_section_name (&xcoff_private_data_section_name, \
220 main_input_filename, ".rw_"); \
221 rs6000_gen_section_name (&xcoff_read_only_section_name, \
222 main_input_filename, ".ro_"); \
224 fputs ("\t.file\t", FILE); \
225 output_quoted_string (FILE, main_input_filename); \
226 fputc ('\n', FILE); \
228 fputs ("\t.machine\t\"ppc64\"\n", FILE); \
230 if (write_symbols != NO_DEBUG) \
231 private_data_section (); \
234 fprintf (FILE, "\t.extern %s\n", RS6000_MCOUNT); \
235 rs6000_file_start (FILE, TARGET_CPU_DEFAULT); \
238 /* Output at end of assembler file.
240 On the RS/6000, referencing data should automatically pull in text. */
242 #define ASM_FILE_END(FILE) \
245 fputs ("_section_.text:\n", FILE); \
247 fputs (TARGET_32BIT \
248 ? "\t.long _section_.text\n" : "\t.llong _section_.text\n", FILE); \
251 /* This macro produces the initial definition of a function name.
252 On the RS/6000, we need to place an extra '.' in the function name and
253 output the function descriptor.
255 The csect for the function will have already been created by the
256 `text_section' call previously done. We do have to go back to that
259 We also record that the function exists in the current compilation
260 unit, reachable by short branch, by setting SYMBOL_REF_FLAG.
262 The third and fourth parameters to the .function pseudo-op (16 and 044)
263 are placeholders which no longer have any use. */
265 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL) \
266 { rtx sym_ref = XEXP (DECL_RTL (DECL), 0); \
267 if (!DECL_WEAK (DECL)) \
268 SYMBOL_REF_FLAG (sym_ref) = 1; \
269 if (TREE_PUBLIC (DECL)) \
271 if (!RS6000_WEAK || !DECL_WEAK (decl)) \
273 fputs ("\t.globl .", FILE); \
274 RS6000_OUTPUT_BASENAME (FILE, NAME); \
280 fputs ("\t.lglobl .", FILE); \
281 RS6000_OUTPUT_BASENAME (FILE, NAME); \
284 fputs ("\t.csect ", FILE); \
285 RS6000_OUTPUT_BASENAME (FILE, NAME); \
286 fputs (TARGET_32BIT ? "[DS]\n" : "[DS],3\n", FILE); \
287 RS6000_OUTPUT_BASENAME (FILE, NAME); \
288 fputs (":\n", FILE); \
289 fputs (TARGET_32BIT ? "\t.long ." : "\t.llong .", FILE); \
290 RS6000_OUTPUT_BASENAME (FILE, NAME); \
291 fputs (", TOC[tc0], 0\n", FILE); \
292 in_section = no_section; \
293 function_section(DECL); \
295 RS6000_OUTPUT_BASENAME (FILE, NAME); \
296 fputs (":\n", FILE); \
297 if (write_symbols == XCOFF_DEBUG) \
298 xcoffout_declare_function (FILE, DECL, NAME); \
301 /* Output a reference to SYM on FILE. */
303 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
304 rs6000_output_symbol_ref (FILE, SYM)
306 /* This says how to output an external. */
308 #undef ASM_OUTPUT_EXTERNAL
309 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
310 { rtx _symref = XEXP (DECL_RTL (DECL), 0); \
311 if ((TREE_CODE (DECL) == VAR_DECL \
312 || TREE_CODE (DECL) == FUNCTION_DECL) \
313 && (NAME)[strlen (NAME) - 1] != ']') \
315 char *_name = (char *) permalloc (strlen (XSTR (_symref, 0)) + 5); \
316 strcpy (_name, XSTR (_symref, 0)); \
317 strcat (_name, TREE_CODE (DECL) == FUNCTION_DECL ? "[DS]" : "[RW]"); \
318 XSTR (_symref, 0) = _name; \
322 /* This is how to output an internal numbered label where
323 PREFIX is the class of label and NUM is the number within the class. */
325 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
326 fprintf (FILE, "%s..%u:\n", (PREFIX), (unsigned) (NUM))
328 /* This is how to output an internal label prefix. rs6000.c uses this
329 when generating traceback tables. */
331 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
332 fprintf (FILE, "%s..", PREFIX)
334 /* This is how to output a label for a jump table. Arguments are the same as
335 for ASM_OUTPUT_INTERNAL_LABEL, except the insn for the jump table is
338 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
339 { ASM_OUTPUT_ALIGN (FILE, 2); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }
341 /* This is how to store into the string LABEL
342 the symbol_ref name of an internal numbered label where
343 PREFIX is the class of label and NUM is the number within the class.
344 This is suitable for output with `assemble_name'. */
346 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
347 sprintf (LABEL, "*%s..%u", (PREFIX), (unsigned) (NUM))
349 /* This is how to output an assembler line to define N characters starting
352 #define ASM_OUTPUT_ASCII(FILE, P, N) output_ascii ((FILE), (P), (N))
354 /* This is how to advance the location counter by SIZE bytes. */
356 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
357 fprintf (FILE, "\t.space %d\n", (SIZE))
359 /* This says how to output an assembler line
360 to define a global common symbol. */
362 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGNMENT) \
363 do { fputs ("\t.comm ", (FILE)); \
364 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
366 fprintf ((FILE), ",%d,3\n", (SIZE)); \
368 fprintf ((FILE), ",%d\n", (SIZE)); \
371 /* This says how to output an assembler line
372 to define a local common symbol.
373 Alignment cannot be specified, but we can try to maintain
374 alignment after preceding TOC section if it was aligned
377 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
378 do { fputs ("\t.lcomm ", (FILE)); \
379 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
380 fprintf ((FILE), ",%d,%s\n", (TARGET_32BIT ? (SIZE) : (ROUNDED)), \
381 xcoff_bss_section_name); \
384 /* This is how we tell the assembler that two symbols have the same value. */
385 #define SET_ASM_OP "\t.set "
387 /* This is how we tell the assembler to equate two values. */
388 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
389 do { fprintf ((FILE), "%s", SET_ASM_OP); \
390 RS6000_OUTPUT_BASENAME (FILE, LABEL1); \
391 fprintf (FILE, ","); \
392 RS6000_OUTPUT_BASENAME (FILE, LABEL2); \
393 fprintf (FILE, "\n"); \
396 /* Used by rs6000_assemble_integer, among others. */
397 #define DOUBLE_INT_ASM_OP "\t.llong\t"
399 /* Output before instructions. */
400 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
402 /* Output before writable data.
403 Align entire section to BIGGEST_ALIGNMENT. */
404 #define DATA_SECTION_ASM_OP "\t.csect .data[RW],3"
406 /* Define unique section name -- functions only. */
407 #define TARGET_ASM_UNIQUE_SECTION rs6000_xcoff_unique_section
409 /* Switch into a generic section. */
410 #define TARGET_ASM_NAMED_SECTION xcoff_asm_named_section
412 /* Define the name of the section to use for the EH language specific
413 data areas (.gcc_except_table on most other systems). */
414 #define TARGET_ASM_EXCEPTION_SECTION data_section
416 /* Define to prevent DWARF2 unwind info in the data section rather
417 than in the .eh_frame section. We do this because the AIX linker
418 would otherwise garbage collect these sections. */
419 #define EH_FRAME_IN_DATA_SECTION 1