1 /* Definitions of target machine for GNU compiler.
2 For ARM with ELF obj format.
3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001
4 Free Software Foundation, Inc.
5 Contributed by Philip Blundell <philb@gnu.org> and
6 Catherine Moore <clm@cygnus.com>
8 This file is part of GNU CC.
10 GNU CC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 GNU CC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with GNU CC; see the file COPYING. If not, write to
22 the Free Software Foundation, 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
26 #define OBJECT_FORMAT_ELF
28 #ifndef LOCAL_LABEL_PREFIX
29 #define LOCAL_LABEL_PREFIX "."
32 #ifndef USER_LABEL_PREFIX
33 #define USER_LABEL_PREFIX ""
36 #ifndef SUBTARGET_CPP_SPEC
37 #define SUBTARGET_CPP_SPEC "-D__ELF__"
40 #ifndef SUBTARGET_EXTRA_SPECS
41 #define SUBTARGET_EXTRA_SPECS \
42 { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC },
45 #ifndef SUBTARGET_EXTRA_ASM_SPEC
46 #define SUBTARGET_EXTRA_ASM_SPEC ""
54 %{mapcs-*:-mapcs-%*} \
55 %{mapcs-float:-mfloat} \
56 %{msoft-float:-mno-fpu} \
57 %{mthumb-interwork:-mthumb-interwork} \
58 %(subtarget_extra_asm_spec)"
61 /* The following macro defines the format used to output the second
62 operand of the .type assembler directive. Different svr4 assemblers
63 expect various different forms for this operand. The one given here
64 is just a default. You may need to override it in your machine-
65 specific tm.h file (depending upon the particulars of your assembler). */
66 #define TYPE_OPERAND_FMT "%s"
68 /* Write the extra assembler code needed to declare a function's result.
69 Most svr4 assemblers don't require any special declaration of the
70 result value, but there are exceptions. */
71 #ifndef ASM_DECLARE_RESULT
72 #define ASM_DECLARE_RESULT(FILE, RESULT)
75 /* These macros generate the special .type and .size directives which
76 are used to set the corresponding fields of the linker symbol table
77 entries in an ELF object file under SVR4. These macros also output
78 the starting labels for the relevant functions/objects. */
79 #define TYPE_ASM_OP "\t.type\t"
80 #define SIZE_ASM_OP "\t.size\t"
82 /* Write the extra assembler code needed to declare a function properly.
83 Some svr4 assemblers need to also have something extra said about the
84 function's return value. We allow for that here. */
85 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
88 ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL); \
89 fprintf (FILE, "%s", TYPE_ASM_OP); \
90 assemble_name (FILE, NAME); \
92 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
94 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
95 ASM_OUTPUT_LABEL(FILE, NAME); \
99 /* Write the extra assembler code needed to declare an object properly. */
100 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
103 fprintf (FILE, "%s", TYPE_ASM_OP); \
104 assemble_name (FILE, NAME); \
106 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
108 size_directive_output = 0; \
109 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
111 size_directive_output = 1; \
112 fprintf (FILE, "%s", SIZE_ASM_OP); \
113 assemble_name (FILE, NAME); \
115 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
116 int_size_in_bytes (TREE_TYPE (DECL))); \
117 fputc ('\n', FILE); \
119 ASM_OUTPUT_LABEL(FILE, NAME); \
123 /* Output the size directive for a decl in rest_of_decl_compilation
124 in the case where we did not do so before the initializer.
125 Once we find the error_mark_node, we know that the value of
126 size_directive_output was set
127 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
128 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
131 const char * name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
132 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
133 && ! AT_END && TOP_LEVEL \
134 && DECL_INITIAL (DECL) == error_mark_node \
135 && !size_directive_output) \
137 size_directive_output = 1; \
138 fprintf (FILE, "%s", SIZE_ASM_OP); \
139 assemble_name (FILE, name); \
141 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
142 int_size_in_bytes (TREE_TYPE (DECL))); \
143 fputc ('\n', FILE); \
148 /* This is how to declare the size of a function. */
149 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
152 ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL); \
153 if (!flag_inhibit_size_directive) \
156 static int labelno; \
158 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
159 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
160 fprintf (FILE, "%s", SIZE_ASM_OP); \
161 assemble_name (FILE, (FNAME)); \
162 fprintf (FILE, ","); \
163 assemble_name (FILE, label); \
164 fprintf (FILE, "-"); \
165 assemble_name (FILE, (FNAME)); \
171 /* Define this macro if jump tables (for `tablejump' insns) should be
172 output in the text section, along with the assembler instructions.
173 Otherwise, the readonly data section is used. */
174 #define JUMP_TABLES_IN_TEXT_SECTION 1
177 #define LINK_SPEC "%{mbig-endian:-EB} -X"
180 /* Run-time Target Specification. */
181 #ifndef TARGET_VERSION
182 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
185 #ifndef TARGET_DEFAULT
186 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
189 #ifndef MULTILIB_DEFAULTS
190 #define MULTILIB_DEFAULTS \
191 { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
194 /* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
195 is a valid machine specific attribute for DECL.
196 The attributes in ATTRIBUTES have previously been assigned to DECL. */
197 #define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
198 arm_valid_machine_decl_attribute (DECL, IDENTIFIER, ARGS)
201 /* This outputs a lot of .req's to define alias for various registers.
202 Let's try to avoid this. */
203 #ifndef ASM_FILE_START
204 #define ASM_FILE_START(STREAM) \
207 fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n", \
208 ASM_COMMENT_START, version_string); \
209 output_file_directive (STREAM, main_input_filename); \
210 fprintf (STREAM, ASM_APP_OFF); \
215 /* Output an internal label definition. */
216 #ifndef ASM_OUTPUT_INTERNAL_LABEL
217 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
220 char * s = (char *) alloca (40 + strlen (PREFIX)); \
221 extern int arm_target_label, arm_ccfsm_state; \
222 extern rtx arm_target_insn; \
224 if (arm_ccfsm_state == 3 && arm_target_label == (NUM) \
225 && !strcmp (PREFIX, "L")) \
227 arm_ccfsm_state = 0; \
228 arm_target_insn = NULL; \
230 ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM)); \
231 ASM_OUTPUT_LABEL (STREAM, s); \
236 /* Support the ctors/dtors and other sections. */
238 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
240 Note that we want to give these sections the SHF_WRITE attribute
241 because these sections will actually contain data (i.e. tables of
242 addresses of functions in the current root executable or shared library
243 file) and, in the case of a shared library, the relocatable addresses
244 will have to be properly resolved/relocated (and then written into) by
245 the dynamic linker when it actually attaches the given shared library
246 to the executing process. (Note that on SVR4, you may wish to use the
247 `-z text' option to the ELF linker, when building a shared library, as
248 an additional check that you are doing everything right. But if you do
249 use the `-z text' option when building a shared library, you will get
250 errors unless the .ctors and .dtors sections are marked as writable
251 via the SHF_WRITE attribute.) */
252 #ifndef CTORS_SECTION_ASM_OP
253 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
256 #ifndef DTORS_SECTION_ASM_OP
257 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
260 /* A list of other sections which the compiler might be "in" at any
262 #ifndef SUBTARGET_EXTRA_SECTIONS
263 #define SUBTARGET_EXTRA_SECTIONS
266 #ifndef EXTRA_SECTIONS
267 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_ctors, in_dtors
270 /* A list of extra section function definitions. */
271 #ifndef SUBTARGET_EXTRA_SECTION_FUNCTIONS
272 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
275 #ifndef EXTRA_SECTION_FUNCTIONS
276 #define EXTRA_SECTION_FUNCTIONS \
277 SUBTARGET_EXTRA_SECTION_FUNCTIONS \
278 CTORS_SECTION_FUNCTION \
279 DTORS_SECTION_FUNCTION
282 #ifndef CTORS_SECTION_FUNCTION
283 #define CTORS_SECTION_FUNCTION \
287 if (in_section != in_ctors) \
289 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
290 in_section = in_ctors; \
295 #ifndef DTORS_SECTION_FUNCTION
296 #define DTORS_SECTION_FUNCTION \
300 if (in_section != in_dtors) \
302 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
303 in_section = in_dtors; \
308 /* A C statement to output something to the assembler file to switch to
309 section NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL
311 #undef ASM_OUTPUT_SECTION_NAME
312 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
315 if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL) \
316 fprintf (STREAM, "\t.section %s,\"ax\",%%progbits\n", NAME); \
317 else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC)) \
318 fprintf (STREAM, "\t.section %s,\"a\"\n", NAME); \
319 else if (! strncmp (NAME, ".bss", 4)) \
320 fprintf (STREAM, "\t.section %s,\"aw\",%%nobits\n", NAME); \
322 fprintf (STREAM, "\t.section %s,\"aw\"\n", NAME); \
326 /* Support the ctors/dtors sections for g++. */
328 #define INT_ASM_OP "\t.word\t"
331 /* A C statement (sans semicolon) to output an element in the table of
332 global constructors. */
333 #ifndef ASM_OUTPUT_CONSTRUCTOR
334 #define ASM_OUTPUT_CONSTRUCTOR(STREAM, NAME) \
338 fprintf (STREAM, "%s", INT_ASM_OP); \
339 assemble_name (STREAM, NAME); \
340 fprintf (STREAM, "\n"); \
345 /* A C statement (sans semicolon) to output an element in the table of
346 global destructors. */
347 #ifndef ASM_OUTPUT_DESTRUCTOR
348 #define ASM_OUTPUT_DESTRUCTOR(STREAM, NAME) \
352 fprintf (STREAM, "%s", INT_ASM_OP); \
353 assemble_name (STREAM, NAME); \
354 fprintf (STREAM, "\n"); \
359 /* This is how we tell the assembler that a symbol is weak. */
361 #define ASM_WEAKEN_LABEL(FILE, NAME) \
364 fputs ("\t.weak\t", FILE); \
365 assemble_name (FILE, NAME); \
366 fputc ('\n', FILE); \
370 #ifndef ASM_OUTPUT_ALIGNED_COMMON
371 #define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGN) \
374 fprintf (STREAM, "\t.comm\t"); \
375 assemble_name (STREAM, NAME); \
376 fprintf (STREAM, ", %d, %d\n", SIZE, ALIGN); \
381 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs. */
382 #define NEED_PLT_RELOC flag_pic
383 #define NEED_GOT_RELOC flag_pic
385 /* The ELF assembler handles GOT addressing differently to NetBSD. */
388 /* Biggest alignment supported by the object file format of this
389 machine. Use this macro to limit the alignment which can be
390 specified using the `__attribute__ ((aligned (N)))' construct. If
391 not defined, the default value is `BIGGEST_ALIGNMENT'. */
392 #define MAX_OFILE_ALIGNMENT (32768 * 8)
394 /* Align output to a power of two. Note ".align 0" is redundant,
395 and also GAS will treat it as ".align 2" which we do not want. */
396 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
400 fprintf (STREAM, "\t.align\t%d\n", POWER); \