1 /* Definitions of target machine for GNU compiler.
2 For ARM with ELF obj format.
3 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000
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_ASM_SPEC
41 #define SUBTARGET_EXTRA_ASM_SPEC
49 %{mapcs-*:-mapcs-%*} \
50 %{mapcs-float:-mfloat} \
51 %{msoft-float:-mno-fpu} \
52 %{mthumb-interwork:-mthumb-interwork} \
53 " SUBTARGET_EXTRA_ASM_SPEC
56 /* The following macro defines the format used to output the second
57 operand of the .type assembler directive. Different svr4 assemblers
58 expect various different forms for this operand. The one given here
59 is just a default. You may need to override it in your machine-
60 specific tm.h file (depending upon the particulars of your assembler). */
61 #define TYPE_OPERAND_FMT "%s"
63 /* Write the extra assembler code needed to declare a function's result.
64 Most svr4 assemblers don't require any special declaration of the
65 result value, but there are exceptions. */
66 #ifndef ASM_DECLARE_RESULT
67 #define ASM_DECLARE_RESULT(FILE, RESULT)
70 /* These macros generate the special .type and .size directives which
71 are used to set the corresponding fields of the linker symbol table
72 entries in an ELF object file under SVR4. These macros also output
73 the starting labels for the relevant functions/objects. */
74 #define TYPE_ASM_OP "\t.type\t"
75 #define SIZE_ASM_OP "\t.size\t"
77 /* Write the extra assembler code needed to declare a function properly.
78 Some svr4 assemblers need to also have something extra said about the
79 function's return value. We allow for that here. */
80 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
83 ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL); \
84 fprintf (FILE, "%s", TYPE_ASM_OP); \
85 assemble_name (FILE, NAME); \
87 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
89 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
90 ASM_OUTPUT_LABEL(FILE, NAME); \
94 /* Write the extra assembler code needed to declare an object properly. */
95 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
98 fprintf (FILE, "%s", TYPE_ASM_OP); \
99 assemble_name (FILE, NAME); \
101 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
103 size_directive_output = 0; \
104 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
106 size_directive_output = 1; \
107 fprintf (FILE, "%s", SIZE_ASM_OP); \
108 assemble_name (FILE, NAME); \
110 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
111 int_size_in_bytes (TREE_TYPE (DECL))); \
112 fputc ('\n', FILE); \
114 ASM_OUTPUT_LABEL(FILE, NAME); \
118 /* Output the size directive for a decl in rest_of_decl_compilation
119 in the case where we did not do so before the initializer.
120 Once we find the error_mark_node, we know that the value of
121 size_directive_output was set
122 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
123 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
126 const char * name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
127 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
128 && ! AT_END && TOP_LEVEL \
129 && DECL_INITIAL (DECL) == error_mark_node \
130 && !size_directive_output) \
132 size_directive_output = 1; \
133 fprintf (FILE, "%s", SIZE_ASM_OP); \
134 assemble_name (FILE, name); \
136 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
137 int_size_in_bytes (TREE_TYPE (DECL))); \
138 fputc ('\n', FILE); \
143 /* This is how to declare the size of a function. */
144 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
147 ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL); \
148 if (!flag_inhibit_size_directive) \
151 static int labelno; \
153 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
154 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
155 fprintf (FILE, "%s", SIZE_ASM_OP); \
156 assemble_name (FILE, (FNAME)); \
157 fprintf (FILE, ","); \
158 assemble_name (FILE, label); \
159 fprintf (FILE, "-"); \
160 assemble_name (FILE, (FNAME)); \
166 /* Define this macro if jump tables (for `tablejump' insns) should be
167 output in the text section, along with the assembler instructions.
168 Otherwise, the readonly data section is used. */
169 #define JUMP_TABLES_IN_TEXT_SECTION 1
172 #define LINK_SPEC "%{mbig-endian:-EB} -X"
175 /* Run-time Target Specification. */
176 #ifndef TARGET_VERSION
177 #define TARGET_VERSION fputs (" (ARM/elf)", stderr)
180 #ifndef TARGET_DEFAULT
181 #define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
184 #ifndef MULTILIB_DEFAULTS
185 #define MULTILIB_DEFAULTS \
186 { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
189 /* A C expression whose value is nonzero if IDENTIFIER with arguments ARGS
190 is a valid machine specific attribute for DECL.
191 The attributes in ATTRIBUTES have previously been assigned to DECL. */
192 #define VALID_MACHINE_DECL_ATTRIBUTE(DECL, ATTRIBUTES, IDENTIFIER, ARGS) \
193 arm_valid_machine_decl_attribute (DECL, IDENTIFIER, ARGS)
196 /* A C statement to output assembler commands which will identify the
197 object file as having been compiled with GNU CC (or another GNU
199 /* Define this to NULL so we don't get anything.
200 We have ASM_IDENTIFY_LANGUAGE.
201 Also, when using stabs, gcc2_compiled must be a stabs entry, not an
202 ordinary symbol, or gdb won't see it. The stabs entry must be
203 before the N_SO in order for gdb to find it. */
204 #ifndef ASM_IDENTIFY_GCC
205 #define ASM_IDENTIFY_GCC(STREAM) \
206 fprintf (STREAM, "%sgcc2_compiled.:\n", LOCAL_LABEL_PREFIX )
209 /* This outputs a lot of .req's to define alias for various registers.
210 Let's try to avoid this. */
211 #ifndef ASM_FILE_START
212 #define ASM_FILE_START(STREAM) \
215 fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n", \
216 ASM_COMMENT_START, version_string); \
217 output_file_directive (STREAM, main_input_filename); \
218 fprintf (STREAM, ASM_APP_OFF); \
223 /* Output an internal label definition. */
224 #ifndef ASM_OUTPUT_INTERNAL_LABEL
225 #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM) \
228 char * s = (char *) alloca (40 + strlen (PREFIX)); \
229 extern int arm_target_label, arm_ccfsm_state; \
230 extern rtx arm_target_insn; \
232 if (arm_ccfsm_state == 3 && arm_target_label == (NUM) \
233 && !strcmp (PREFIX, "L")) \
235 arm_ccfsm_state = 0; \
236 arm_target_insn = NULL; \
238 ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM)); \
239 ASM_OUTPUT_LABEL (STREAM, s); \
244 /* Support the ctors/dtors and other sections. */
246 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
248 Note that we want to give these sections the SHF_WRITE attribute
249 because these sections will actually contain data (i.e. tables of
250 addresses of functions in the current root executable or shared library
251 file) and, in the case of a shared library, the relocatable addresses
252 will have to be properly resolved/relocated (and then written into) by
253 the dynamic linker when it actually attaches the given shared library
254 to the executing process. (Note that on SVR4, you may wish to use the
255 `-z text' option to the ELF linker, when building a shared library, as
256 an additional check that you are doing everything right. But if you do
257 use the `-z text' option when building a shared library, you will get
258 errors unless the .ctors and .dtors sections are marked as writable
259 via the SHF_WRITE attribute.) */
260 #ifndef CTORS_SECTION_ASM_OP
261 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
264 #ifndef DTORS_SECTION_ASM_OP
265 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
268 /* A list of other sections which the compiler might be "in" at any
270 #ifndef SUBTARGET_EXTRA_SECTIONS
271 #define SUBTARGET_EXTRA_SECTIONS
274 #ifndef EXTRA_SECTIONS
275 #define EXTRA_SECTIONS SUBTARGET_EXTRA_SECTIONS in_ctors, in_dtors
278 /* A list of extra section function definitions. */
279 #ifndef SUBTARGET_EXTRA_SECTION_FUNCTIONS
280 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS
283 #ifndef EXTRA_SECTION_FUNCTIONS
284 #define EXTRA_SECTION_FUNCTIONS \
285 SUBTARGET_EXTRA_SECTION_FUNCTIONS \
286 CTORS_SECTION_FUNCTION \
287 DTORS_SECTION_FUNCTION
290 #ifndef CTORS_SECTION_FUNCTION
291 #define CTORS_SECTION_FUNCTION \
295 if (in_section != in_ctors) \
297 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
298 in_section = in_ctors; \
303 #ifndef DTORS_SECTION_FUNCTION
304 #define DTORS_SECTION_FUNCTION \
308 if (in_section != in_dtors) \
310 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
311 in_section = in_dtors; \
316 /* A C statement to output something to the assembler file to switch to
317 section NAME for object DECL which is either a FUNCTION_DECL, a VAR_DECL
319 #undef ASM_OUTPUT_SECTION_NAME
320 #define ASM_OUTPUT_SECTION_NAME(STREAM, DECL, NAME, RELOC) \
323 if ((DECL) && TREE_CODE (DECL) == FUNCTION_DECL) \
324 fprintf (STREAM, "\t.section %s,\"ax\",%%progbits\n", NAME); \
325 else if ((DECL) && DECL_READONLY_SECTION (DECL, RELOC)) \
326 fprintf (STREAM, "\t.section %s,\"a\"\n", NAME); \
327 else if (! strncmp (NAME, ".bss", 4)) \
328 fprintf (STREAM, "\t.section %s,\"aw\",%%nobits\n", NAME); \
330 fprintf (STREAM, "\t.section %s,\"aw\"\n", NAME); \
334 /* Support the ctors/dtors sections for g++. */
336 #define INT_ASM_OP "\t.word\t"
339 /* A C statement (sans semicolon) to output an element in the table of
340 global constructors. */
341 #ifndef ASM_OUTPUT_CONSTRUCTOR
342 #define ASM_OUTPUT_CONSTRUCTOR(STREAM, NAME) \
346 fprintf (STREAM, "%s", INT_ASM_OP); \
347 assemble_name (STREAM, NAME); \
348 fprintf (STREAM, "\n"); \
353 /* A C statement (sans semicolon) to output an element in the table of
354 global destructors. */
355 #ifndef ASM_OUTPUT_DESTRUCTOR
356 #define ASM_OUTPUT_DESTRUCTOR(STREAM, NAME) \
360 fprintf (STREAM, "%s", INT_ASM_OP); \
361 assemble_name (STREAM, NAME); \
362 fprintf (STREAM, "\n"); \
367 /* This is how we tell the assembler that a symbol is weak. */
369 #define ASM_WEAKEN_LABEL(FILE, NAME) \
372 fputs ("\t.weak\t", FILE); \
373 assemble_name (FILE, NAME); \
374 fputc ('\n', FILE); \
378 /* For PIC code we need to explicitly specify (PLT) and (GOT) relocs. */
379 #define NEED_PLT_RELOC flag_pic
380 #define NEED_GOT_RELOC flag_pic
382 /* The ELF assembler handles GOT addressing differently to NetBSD. */
385 /* Biggest alignment supported by the object file format of this
386 machine. Use this macro to limit the alignment which can be
387 specified using the `__attribute__ ((aligned (N)))' construct. If
388 not defined, the default value is `BIGGEST_ALIGNMENT'. */
389 #define MAX_OFILE_ALIGNMENT (32768 * 8)
391 /* Align output to a power of two. Note ".align 0" is redundant,
392 and also GAS will treat it as ".align 2" which we do not want. */
393 #define ASM_OUTPUT_ALIGN(STREAM, POWER) \
397 fprintf (STREAM, "\t.align\t%d\n", POWER); \