1 /* Definitions of target machine for GNU compiler,
2 for some generic XCOFF file format
3 Copyright (C) 2001, 2002, 2003, 2004, 2007 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published
9 by the Free Software Foundation; either version 2, or (at your
10 option) any later version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 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 the
19 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
20 MA 02110-1301, USA. */
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 /* Return nonzero if this entry is to be written into the constant
65 pool in a special way. We do so if this is a SYMBOL_REF, LABEL_REF
66 or a CONST containing one of them. If -mfp-in-toc (the default),
67 we also do this for floating-point constants. We actually can only
68 do this if the FP formats of the target and host machines are the
69 same, but we can't check that since not every file that uses
70 GO_IF_LEGITIMATE_ADDRESS_P includes real.h. We also do this when
71 we can write the entry into the TOC and the entry is not larger
74 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) \
76 && (GET_CODE (X) == SYMBOL_REF \
77 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
78 && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF) \
79 || GET_CODE (X) == LABEL_REF \
80 || (GET_CODE (X) == CONST_INT \
81 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \
82 || (GET_CODE (X) == CONST_DOUBLE \
83 && (TARGET_POWERPC64 \
84 || TARGET_MINIMAL_TOC \
85 || (SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
86 && ! TARGET_NO_FP_IN_TOC)))))
88 #define TARGET_ASM_OUTPUT_ANCHOR rs6000_xcoff_asm_output_anchor
89 #define TARGET_ASM_GLOBALIZE_LABEL rs6000_xcoff_asm_globalize_label
90 #define TARGET_ASM_INIT_SECTIONS rs6000_xcoff_asm_init_sections
91 #define TARGET_ASM_RELOC_RW_MASK rs6000_xcoff_reloc_rw_mask
92 #define TARGET_ASM_NAMED_SECTION rs6000_xcoff_asm_named_section
93 #define TARGET_ASM_SELECT_SECTION rs6000_xcoff_select_section
94 #define TARGET_ASM_SELECT_RTX_SECTION rs6000_xcoff_select_rtx_section
95 #define TARGET_ASM_UNIQUE_SECTION rs6000_xcoff_unique_section
96 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
97 #define TARGET_STRIP_NAME_ENCODING rs6000_xcoff_strip_name_encoding
98 #define TARGET_SECTION_TYPE_FLAGS rs6000_xcoff_section_type_flags
100 /* FP save and restore routines. */
101 #define SAVE_FP_PREFIX "._savef"
102 #define SAVE_FP_SUFFIX ""
103 #define RESTORE_FP_PREFIX "._restf"
104 #define RESTORE_FP_SUFFIX ""
106 /* Function name to call to do profiling. */
108 #define RS6000_MCOUNT ".__mcount"
110 /* This outputs NAME to FILE up to the first null or '['. */
112 #define RS6000_OUTPUT_BASENAME(FILE, NAME) \
113 assemble_name ((FILE), (*targetm.strip_name_encoding) (NAME))
115 /* This is how to output the definition of a user-level label named NAME,
116 such as the label on a static function or variable NAME. */
118 #define ASM_OUTPUT_LABEL(FILE,NAME) \
119 do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
121 /* This is how to output a command to make the user-level label named NAME
122 defined for reference from other files. */
124 /* Globalizing directive for a label. */
125 #define GLOBAL_ASM_OP "\t.globl "
127 #undef TARGET_ASM_FILE_START
128 #define TARGET_ASM_FILE_START rs6000_xcoff_file_start
129 #define TARGET_ASM_FILE_END rs6000_xcoff_file_end
130 #undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
131 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE false
133 /* This macro produces the initial definition of a function name.
134 On the RS/6000, we need to place an extra '.' in the function name and
135 output the function descriptor.
137 The csect for the function will have already been created when
138 text_section was selected. We do have to go back to that csect, however.
140 The third and fourth parameters to the .function pseudo-op (16 and 044)
141 are placeholders which no longer have any use. */
143 #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL) \
144 { if (TREE_PUBLIC (DECL)) \
146 if (!RS6000_WEAK || !DECL_WEAK (decl)) \
148 fputs ("\t.globl .", FILE); \
149 RS6000_OUTPUT_BASENAME (FILE, NAME); \
155 fputs ("\t.lglobl .", FILE); \
156 RS6000_OUTPUT_BASENAME (FILE, NAME); \
159 fputs ("\t.csect ", FILE); \
160 RS6000_OUTPUT_BASENAME (FILE, NAME); \
161 fputs (TARGET_32BIT ? "[DS]\n" : "[DS],3\n", FILE); \
162 RS6000_OUTPUT_BASENAME (FILE, NAME); \
163 fputs (":\n", FILE); \
164 fputs (TARGET_32BIT ? "\t.long ." : "\t.llong .", FILE); \
165 RS6000_OUTPUT_BASENAME (FILE, NAME); \
166 fputs (", TOC[tc0], 0\n", FILE); \
168 switch_to_section (function_section (DECL)); \
170 RS6000_OUTPUT_BASENAME (FILE, NAME); \
171 fputs (":\n", FILE); \
172 if (write_symbols != NO_DEBUG) \
173 xcoffout_declare_function (FILE, DECL, NAME); \
176 /* Output a reference to SYM on FILE. */
178 #define ASM_OUTPUT_SYMBOL_REF(FILE, SYM) \
179 rs6000_output_symbol_ref (FILE, SYM)
181 /* This says how to output an external. */
183 #undef ASM_OUTPUT_EXTERNAL
184 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
185 { rtx _symref = XEXP (DECL_RTL (DECL), 0); \
186 if ((TREE_CODE (DECL) == VAR_DECL \
187 || TREE_CODE (DECL) == FUNCTION_DECL) \
188 && (NAME)[strlen (NAME) - 1] != ']') \
190 XSTR (_symref, 0) = concat (XSTR (_symref, 0), \
191 (TREE_CODE (DECL) == FUNCTION_DECL \
192 ? "[DS]" : "[RW]"), \
197 /* This is how to output an internal label prefix. rs6000.c uses this
198 when generating traceback tables. */
200 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
201 fprintf (FILE, "%s..", PREFIX)
203 /* This is how to output a label for a jump table. Arguments are the same as
204 for (*targetm.asm_out.internal_label), except the insn for the jump table is
207 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN) \
208 { ASM_OUTPUT_ALIGN (FILE, 2); (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); }
210 /* This is how to store into the string LABEL
211 the symbol_ref name of an internal numbered label where
212 PREFIX is the class of label and NUM is the number within the class.
213 This is suitable for output with `assemble_name'. */
215 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
216 sprintf (LABEL, "*%s..%u", (PREFIX), (unsigned) (NUM))
218 /* This is how to output an assembler line to define N characters starting
221 #define ASM_OUTPUT_ASCII(FILE, P, N) output_ascii ((FILE), (P), (N))
223 /* This is how to advance the location counter by SIZE bytes. */
225 #define SKIP_ASM_OP "\t.space "
227 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
228 fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE))
230 /* This says how to output an assembler line
231 to define a global common symbol. */
233 #define COMMON_ASM_OP "\t.comm "
235 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
236 do { fputs (COMMON_ASM_OP, (FILE)); \
237 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
239 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", (SIZE), \
240 exact_log2 ((ALIGN) / BITS_PER_UNIT)); \
241 else if ((SIZE) > 4) \
242 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",3\n", (SIZE)); \
244 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (SIZE)); \
247 /* This says how to output an assembler line
248 to define a local common symbol.
249 Alignment cannot be specified, but we can try to maintain
250 alignment after preceding TOC section if it was aligned
253 #define LOCAL_COMMON_ASM_OP "\t.lcomm "
255 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
256 do { fputs (LOCAL_COMMON_ASM_OP, (FILE)); \
257 RS6000_OUTPUT_BASENAME ((FILE), (NAME)); \
258 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%s\n", \
259 (TARGET_32BIT ? (SIZE) : (ROUNDED)), \
260 xcoff_bss_section_name); \
263 /* This is how we tell the assembler that two symbols have the same value. */
264 #define SET_ASM_OP "\t.set "
266 /* This is how we tell the assembler to equate two values. */
267 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \
268 do { fprintf ((FILE), "%s", SET_ASM_OP); \
269 RS6000_OUTPUT_BASENAME (FILE, LABEL1); \
270 fprintf (FILE, ","); \
271 RS6000_OUTPUT_BASENAME (FILE, LABEL2); \
272 fprintf (FILE, "\n"); \
275 /* Used by rs6000_assemble_integer, among others. */
276 #define DOUBLE_INT_ASM_OP "\t.llong\t"
278 /* Output before instructions. */
279 #define TEXT_SECTION_ASM_OP "\t.csect .text[PR]"
281 /* Output before writable data.
282 Align entire section to BIGGEST_ALIGNMENT. */
283 #define DATA_SECTION_ASM_OP "\t.csect .data[RW],3"
285 /* Define to prevent DWARF2 unwind info in the data section rather
286 than in the .eh_frame section. We do this because the AIX linker
287 would otherwise garbage collect these sections. */
288 #define EH_FRAME_IN_DATA_SECTION 1