1 /* Definitions of target machine for GNU compiler,
2 for some generic XCOFF file format
3 Copyright (C) 2001, 2002, 2003, 2004, 2007, 2008
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 3, or (at your
11 option) any later version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
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/>. */
22 #define TARGET_OBJECT_FORMAT OBJECT_XCOFF
24 /* The RS/6000 uses the XCOFF format. */
25 #define XCOFF_DEBUGGING_INFO 1
27 /* Define if the object format being used is COFF or a superset. */
28 #define OBJECT_FORMAT_COFF
30 /* Define the magic numbers that we recognize as COFF.
32 AIX 4.3 adds U803XTOCMAGIC (0757) for 64-bit objects and AIX V5 adds
33 U64_TOCMAGIC (0767), but collect2.c does not include files in the
34 correct order to conditionally define the symbolic name in this macro.
36 The AIX linker accepts import/export files as object files,
37 so accept "#!" (0x2321) magic number. */
38 #define MY_ISCOFF(magic) \
39 ((magic) == U802WRMAGIC || (magic) == U802ROMAGIC \
40 || (magic) == U802TOCMAGIC || (magic) == 0757 || (magic) == 0767 \
43 /* We don't have GAS for the RS/6000 yet, so don't write out special
46 #define FASCIST_ASSEMBLER
48 /* We define this to prevent the name mangler from putting dollar signs into
51 #define NO_DOLLAR_IN_LABEL
53 /* We define this to 0 so that gcc will never accept a dollar sign in a
54 variable name. This is needed because the AIX assembler will not accept
57 #define DOLLARS_IN_IDENTIFIERS 0
59 /* AIX .align pseudo-op accept value from 0 to 12, corresponding to
60 log base 2 of the alignment in bytes; 12 = 4096 bytes = 32768 bits. */
62 #define MAX_OFILE_ALIGNMENT 32768
64 /* Default alignment factor for csect directives, chosen to honor
66 #define XCOFF_CSECT_DEFAULT_ALIGNMENT_STR "4"
68 /* Return nonzero if this entry is to be written into the constant
69 pool in a special way. We do so if this is a SYMBOL_REF, LABEL_REF
70 or a CONST containing one of them. If -mfp-in-toc (the default),
71 we also do this for floating-point constants. We actually can only
72 do this if the FP formats of the target and host machines are the
73 same, but we can't check that since not every file that uses these
74 target macros includes real.h. We also do this when we can write the
75 entry into the TOC and the entry is not larger than a TOC entry. */
77 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) \
79 && (GET_CODE (X) == SYMBOL_REF \
80 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
81 && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF) \
82 || GET_CODE (X) == LABEL_REF \
83 || (GET_CODE (X) == CONST_INT \
84 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \
85 || (GET_CODE (X) == CONST_DOUBLE \
86 && (TARGET_MINIMAL_TOC \
87 || (SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
88 && ! TARGET_NO_FP_IN_TOC)))))
90 #define TARGET_ASM_OUTPUT_ANCHOR rs6000_xcoff_asm_output_anchor
91 #define TARGET_ASM_GLOBALIZE_LABEL rs6000_xcoff_asm_globalize_label
92 #define TARGET_ASM_INIT_SECTIONS rs6000_xcoff_asm_init_sections
93 #define TARGET_ASM_RELOC_RW_MASK rs6000_xcoff_reloc_rw_mask
94 #define TARGET_ASM_NAMED_SECTION rs6000_xcoff_asm_named_section
95 #define TARGET_ASM_SELECT_SECTION rs6000_xcoff_select_section
96 #define TARGET_ASM_SELECT_RTX_SECTION rs6000_xcoff_select_rtx_section
97 #define TARGET_ASM_UNIQUE_SECTION rs6000_xcoff_unique_section
98 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
99 #define TARGET_STRIP_NAME_ENCODING rs6000_xcoff_strip_name_encoding
100 #define TARGET_SECTION_TYPE_FLAGS rs6000_xcoff_section_type_flags
102 /* FP save and restore routines. */
103 #define SAVE_FP_PREFIX "._savef"
104 #define SAVE_FP_SUFFIX ""
105 #define RESTORE_FP_PREFIX "._restf"
106 #define RESTORE_FP_SUFFIX ""
108 /* Function name to call to do profiling. */
110 #define RS6000_MCOUNT ".__mcount"
112 /* This outputs NAME to FILE up to the first null or '['. */
114 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
115 assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
117 /* This is how to output the definition of a user-level label named NAME,
118 such as the label on a static function or variable NAME. */
120 #define ASM_OUTPUT_LABEL(FILE,NAME) \
121 do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
123 /* This is how to output a command to make the user-level label named NAME
124 defined for reference from other files. */
126 /* Globalizing directive for a label. */
127 #define GLOBAL_ASM_OP "\t.globl "
129 #undef TARGET_ASM_FILE_START
130 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
131 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
132 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
133 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
135 /* This macro produces the initial definition of a function name.
136 On the RS/6000, we need to place an extra '.' in the function name and
137 output the function descriptor.
138 Dollar signs are converted to underscores.
140 The csect for the function will have already been created when
141 text_section was selected. We do have to go back to that csect, however.
143 The third and fourth parameters to the .function pseudo-op (16 and 044)
144 are placeholders which no longer have any use. */
146 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL) \
147 { char *buffer = (char *) alloca (strlen (NAME) + 1); \
149 int dollar_inside = 0; \
150 strcpy (buffer, NAME); \
151 p = strchr (buffer, '$'); \
155 p = strchr (p + 1, '$'); \
157 if (TREE_PUBLIC (DECL)) \
159 if (!RS6000_WEAK || !DECL_WEAK (decl)) \
161 if (dollar_inside) { \
162 fprintf(FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME); \
163 fprintf(FILE, "\t.rename %s,\"%s\"\n", buffer, NAME); \
165 fputs ("\t.globl .", FILE); \
166 RS6000_OUTPUT_BASENAME (FILE, buffer); \
172 if (dollar_inside) { \
173 fprintf(FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME); \
174 fprintf(FILE, "\t.rename %s,\"%s\"\n", buffer, NAME); \
176 fputs ("\t.lglobl .", FILE); \
177 RS6000_OUTPUT_BASENAME (FILE, buffer); \
180 fputs ("\t.csect ", FILE); \
181 RS6000_OUTPUT_BASENAME (FILE, buffer); \
182 fputs (TARGET_32BIT ? "[DS]\n" : "[DS],3\n", FILE); \
183 RS6000_OUTPUT_BASENAME (FILE, buffer); \
184 fputs (":\n", FILE); \
185 fputs (TARGET_32BIT ? "\t.long ." : "\t.llong .", FILE); \
186 RS6000_OUTPUT_BASENAME (FILE, buffer); \
187 fputs (", TOC[tc0], 0\n", FILE); \
189 switch_to_section (function_section (DECL)); \
191 RS6000_OUTPUT_BASENAME (FILE, buffer); \
192 fputs (":\n", FILE); \
193 if (write_symbols != NO_DEBUG && !DECL_IGNORED_P (DECL)) \
194 xcoffout_declare_function (FILE, DECL, buffer); \
197 /* Output a reference to SYM on FILE. */
199 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
200 rs6000_output_symbol_ref (FILE, SYM)
202 /* This says how to output an external.
203 Dollar signs are converted to underscores. */
205 #undef ASM_OUTPUT_EXTERNAL
206 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
207 { char *buffer = (char *) alloca (strlen (NAME) + 1); \
209 rtx _symref = XEXP (DECL_RTL (DECL), 0); \
210 int dollar_inside = 0; \
211 strcpy (buffer, NAME); \
212 p = strchr (buffer, '$'); \
216 p = strchr (p + 1, '$'); \
218 if (dollar_inside) { \
219 fputs ("\t.extern .", FILE); \
220 RS6000_OUTPUT_BASENAME (FILE, buffer); \
222 fprintf(FILE, "\t.rename .%s,\".%s\"\n", buffer, NAME); \
224 if ((TREE_CODE (DECL) == VAR_DECL \
225 || TREE_CODE (DECL) == FUNCTION_DECL) \
226 && (NAME)[strlen (NAME) - 1] != ']') \
228 XSTR (_symref, 0) = concat (XSTR (_symref, 0), \
229 (TREE_CODE (DECL) == FUNCTION_DECL \
230 ? "[DS]" : "[RW]"), \
235 /* This is how to output a reference to a user-level label named NAME.
236 `assemble_name' uses this. */
238 #define ASM_OUTPUT_LABELREF(FILE,NAME) \
239 asm_fprintf ((FILE), "%U%s", rs6000_xcoff_strip_dollar (NAME));
241 /* This is how to output an internal label prefix. rs6000.c uses this
242 when generating traceback tables. */
244 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
245 fprintf (FILE, "%s..", PREFIX)
247 /* This is how to output a label for a jump table. Arguments are the same as
248 for (*targetm.asm_out.internal_label), except the insn for the jump table is
251 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
252 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
254 /* This is how to store into the string LABEL
255 the symbol_ref name of an internal numbered label where
256 PREFIX is the class of label and NUM is the number within the class.
257 This is suitable for output with `assemble_name'. */
259 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
260 sprintf (LABEL, "*%s..%u", rs6000_xcoff_strip_dollar (PREFIX), (unsigned) (NUM))
262 /* This is how to output an assembler line to define N characters starting
265 #define ASM_OUTPUT_ASCII(FILE, P, N) output_ascii ((FILE), (P), (N))
267 /* This is how to advance the location counter by SIZE bytes. */
269 #define SKIP_ASM_OP "\t.space "
271 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
272 fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
274 /* This says how to output an assembler line
275 to define a global common symbol. */
277 #define COMMON_ASM_OP "\t.comm "
279 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
280 do { fputs (COMMON_ASM_OP, (FILE)); \
281 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
283 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \
284 exact_log2 ((ALIGN) / BITS_PER_UNIT)); \
285 else if ((SIZE) > 4) \
286 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",3\n", (SIZE)); \
288 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)); \
291 /* This says how to output an assembler line
292 to define a local common symbol.
293 Alignment cannot be specified, but we can try to maintain
294 alignment after preceding TOC section if it was aligned
297 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
299 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
300 do { fputs (LOCAL_COMMON_ASM_OP, (FILE)); \
301 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
302 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
303 (TARGET_32BIT ? (SIZE) : (ROUNDED)), \
304 xcoff_bss_section_name); \
307 /* This is how we tell the assembler that two symbols have the same value. */
308 #define SET_ASM_OP "\t.set "
310 /* This is how we tell the assembler to equate two values. */
311 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
312 do { fprintf ((FILE), "%s", SET_ASM_OP); \
313 RS6000_OUTPUT_BASENAME (FILE, LABEL1); \
314 fprintf (FILE, ","); \
315 RS6000_OUTPUT_BASENAME (FILE, LABEL2); \
316 fprintf (FILE, "\n"); \
319 /* Used by rs6000_assemble_integer, among others. */
320 #define DOUBLE_INT_ASM_OP "\t.llong\t"
322 /* Output before instructions. */
323 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
325 /* Output before writable data. */
326 #define DATA_SECTION_ASM_OP \
327 "\t.csect .data[RW]," XCOFF_CSECT_DEFAULT_ALIGNMENT_STR
330 /* Define to prevent DWARF2 unwind info in the data section rather
331 than in the .eh_frame section. We do this because the AIX linker
332 would otherwise garbage collect these sections. */
333 #define EH_FRAME_IN_DATA_SECTION 1