elf.h revision 96263 
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>
7
8This file is part of GNU CC.
9
10GNU CC is free software; you can redistribute it and/or modify
11it under the terms of the GNU General Public License as published by
12the Free Software Foundation; either version 2, or (at your option)
13any later version.
14
15GNU CC is distributed in the hope that it will be useful,
16but WITHOUT ANY WARRANTY; without even the implied warranty of
17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18GNU General Public License for more details.
19
20You should have received a copy of the GNU General Public License
21along with GNU CC; see the file COPYING.  If not, write to
22the Free Software Foundation, 59 Temple Place - Suite 330,
23Boston, MA 02111-1307, USA.  */
24
25#ifndef OBJECT_FORMAT_ELF
26 #error elf.h included before elfos.h
27#endif
28
29#ifndef LOCAL_LABEL_PREFIX
30#define LOCAL_LABEL_PREFIX "."
31#endif
32
33#ifndef SUBTARGET_CPP_SPEC
34#define SUBTARGET_CPP_SPEC  "-D__ELF__"
35#endif
36
37#ifndef SUBTARGET_EXTRA_SPECS
38#define SUBTARGET_EXTRA_SPECS \
39  { "subtarget_extra_asm_spec",	SUBTARGET_EXTRA_ASM_SPEC },
40#endif
41
42#ifndef SUBTARGET_EXTRA_ASM_SPEC
43#define SUBTARGET_EXTRA_ASM_SPEC ""
44#endif
45
46#ifndef ASM_SPEC
47#define ASM_SPEC "\
48%{mbig-endian:-EB} \
49%{mcpu=*:-m%*} \
50%{march=*:-m%*} \
51%{mapcs-*:-mapcs-%*} \
52%{mapcs-float:-mfloat} \
53%{msoft-float:-mno-fpu} \
54%{mthumb-interwork:-mthumb-interwork} \
55%(subtarget_extra_asm_spec)"
56#endif
57
58/* The ARM uses @ are a comment character so we need to redefine
59   TYPE_OPERAND_FMT.  */
60#undef  TYPE_OPERAND_FMT
61#define TYPE_OPERAND_FMT	"%s"
62
63/* We might need a ARM specific header to function declarations.  */
64#undef  ASM_DECLARE_FUNCTION_NAME
65#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)	\
66  do							\
67    {							\
68      ARM_DECLARE_FUNCTION_NAME (FILE, NAME, DECL);     \
69      fprintf (FILE, "%s", TYPE_ASM_OP);		\
70      assemble_name (FILE, NAME);			\
71      putc (',', FILE);					\
72      fprintf (FILE, TYPE_OPERAND_FMT, "function");	\
73      putc ('\n', FILE);				\
74      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));	\
75      ASM_OUTPUT_LABEL(FILE, NAME);			\
76    }							\
77  while (0)
78
79/* We might need an ARM specific trailer for function declarations.  */
80#undef  ASM_DECLARE_FUNCTION_SIZE
81#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)		\
82  do								\
83    {								\
84      ARM_DECLARE_FUNCTION_SIZE (FILE, FNAME, DECL);		\
85      if (!flag_inhibit_size_directive)				\
86        {							\
87          char label[256];					\
88	  static int labelno;					\
89	  labelno ++;						\
90	  ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);	\
91	  ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);	\
92	  fprintf (FILE, "%s", SIZE_ASM_OP);			\
93	  assemble_name (FILE, (FNAME));			\
94          fprintf (FILE, ",");					\
95	  assemble_name (FILE, label);				\
96          fprintf (FILE, "-");					\
97	  assemble_name (FILE, (FNAME));			\
98	  putc ('\n', FILE);					\
99        }							\
100    }								\
101  while (0)
102
103/* Define this macro if jump tables (for `tablejump' insns) should be
104   output in the text section, along with the assembler instructions.
105   Otherwise, the readonly data section is used.  */
106/* We put ARM jump tables in the text section, because it makes the code
107   more efficient, but for Thumb it's better to put them out of band.  */
108#define JUMP_TABLES_IN_TEXT_SECTION (TARGET_ARM)
109
110#ifndef LINK_SPEC
111#define LINK_SPEC "%{mbig-endian:-EB} -X"
112#endif
113
114/* Run-time Target Specification.  */
115#ifndef TARGET_VERSION
116#define TARGET_VERSION fputs (" (ARM/elf)", stderr)
117#endif
118
119#ifndef TARGET_DEFAULT
120#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME)
121#endif
122
123#ifndef MULTILIB_DEFAULTS
124#define MULTILIB_DEFAULTS \
125  { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
126#endif
127
128
129/* This outputs a lot of .req's to define alias for various registers.
130   Let's try to avoid this.  */
131#ifndef ASM_FILE_START
132#define ASM_FILE_START(STREAM)					\
133  do								\
134    {								\
135      fprintf (STREAM, "%s Generated by gcc %s for ARM/elf\n",	\
136	       ASM_COMMENT_START, version_string);		\
137      output_file_directive (STREAM, main_input_filename);	\
138      fprintf (STREAM, ASM_APP_OFF);				\
139    }								\
140  while (0)
141#endif
142
143/* Output an internal label definition.  */
144#undef  ASM_OUTPUT_INTERNAL_LABEL
145#define ASM_OUTPUT_INTERNAL_LABEL(STREAM, PREFIX, NUM)  	\
146  do								\
147    {								\
148      char * s = (char *) alloca (40 + strlen (PREFIX));	\
149      extern int arm_target_label, arm_ccfsm_state;		\
150      extern rtx arm_target_insn;				\
151								\
152      if (arm_ccfsm_state == 3 && arm_target_label == (NUM)	\
153	  && !strcmp (PREFIX, "L"))				\
154	{							\
155	  arm_ccfsm_state = 0;					\
156	  arm_target_insn = NULL;				\
157	}							\
158      ASM_GENERATE_INTERNAL_LABEL (s, (PREFIX), (NUM));		\
159      ASM_OUTPUT_LABEL (STREAM, s);		                \
160    }								\
161  while (0)
162
163#undef  TARGET_ASM_NAMED_SECTION
164#define TARGET_ASM_NAMED_SECTION  arm_elf_asm_named_section
165
166#undef  ASM_OUTPUT_ALIGNED_COMMON
167#define ASM_OUTPUT_ALIGNED_COMMON(STREAM, NAME, SIZE, ALIGN)	\
168  do								\
169    {								\
170      fprintf (STREAM, "\t.comm\t");				\
171      assemble_name (STREAM, NAME);				\
172      fprintf (STREAM, ", %d, %d\n", SIZE, ALIGN);		\
173    }								\
174  while (0)
175
176/* For PIC code we need to explicitly specify (PLT) and (GOT) relocs.  */
177#define NEED_PLT_RELOC	flag_pic
178#define NEED_GOT_RELOC	flag_pic
179
180/* The ELF assembler handles GOT addressing differently to NetBSD.  */
181#define GOT_PCREL	0
182
183/* Biggest alignment supported by the object file format of this
184   machine.  Use this macro to limit the alignment which can be
185   specified using the `__attribute__ ((aligned (N)))' construct.  If
186   not defined, the default value is `BIGGEST_ALIGNMENT'.  */
187#define MAX_OFILE_ALIGNMENT (32768 * 8)
188
189/* Align output to a power of two.  Note ".align 0" is redundant,
190   and also GAS will treat it as ".align 2" which we do not want.  */
191#define ASM_OUTPUT_ALIGN(STREAM, POWER)			\
192  do							\
193    {							\
194      if ((POWER) > 0)					\
195	fprintf (STREAM, "\t.align\t%d\n", POWER);	\
196    }							\
197  while (0)
198
199#define SUPPORTS_INIT_PRIORITY 1
200