1 /* Definitions for ARM running Linux-based GNU systems using ELF
2 Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Contributed by Philip Blundell <philb@gnu.org>
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* Run-time Target Specification. */
24 #define TARGET_VERSION fputs (" (ARM GNU/Linux with ELF)", stderr);
26 /* Do not assume anything about header files. */
27 #define NO_IMPLICIT_EXTERN_C
29 /* Default is to use APCS-32 mode. */
30 #define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_MMU_TRAPS)
31 #define SUBTARGET_EXTRA_LINK_SPEC " -m armelf_linux -p"
32 #define MULTILIB_DEFAULTS \
33 { "marm", "mlittle-endian", "mhard-float", "mapcs-32", "mno-thumb-interwork" }
34 #define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
36 /* This was defined in linux.h. Define it here also. */
37 #undef DEFAULT_VTABLE_THUNKS
38 #define DEFAULT_VTABLE_THUNKS 1
40 /* Handle #pragma weak and #pragma pack. */
41 #define HANDLE_SYSV_PRAGMA
43 /* Now we define the strings used to build the spec file. */
46 %{!shared: %{pthread:-lpthread} \
47 %{profile:-lc_p} %{!profile: -lc}}"
50 #define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
52 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
53 the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
54 provides part of the support for getting C++ file-scope static
55 object constructed before entering `main'. */
57 #define STARTFILE_SPEC \
59 %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
60 %{!p:%{profile:gcrt1.o%s} \
61 %{!profile:crt1.o%s}}}} \
62 crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
64 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux. Here we tack on
65 the GNU/Linux magical crtend.o file (see crtstuff.c) which
66 provides part of the support for getting C++ file-scope static
67 object constructed before entering `main', followed by a normal
68 GNU/Linux "finalizer" file, `crtn.o'. */
70 #define ENDFILE_SPEC \
71 "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
73 #define LINK_SPEC "%{h*} %{version:-v} \
77 %{symbolic:-Bsymbolic} \
78 %{rdynamic:-export-dynamic} \
79 %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
82 SUBTARGET_EXTRA_LINK_SPEC
85 #define CPP_PREDEFINES \
86 "-Dunix -Dlinux -D__ELF__ \
87 -Asystem=unix -Asystem=posix -Acpu=arm -Amachine=arm"
89 /* Allow #sccs in preprocessor. */
90 #define SCCS_DIRECTIVE
92 #define USER_LABEL_PREFIX "" /* For ELF the default is no underscores */
93 #define LOCAL_LABEL_PREFIX "."
95 #define IDENT_ASM_OP "\t.ident\t"
97 /* Output #ident as a .ident. */
98 #define ASM_OUTPUT_IDENT(FILE, NAME) \
99 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
101 /* Support const sections and the ctors and dtors sections for g++.
102 Note that there appears to be two different ways to support const
103 sections at the moment. You can either #define the symbol
104 READONLY_DATA_SECTION (giving it some code which switches to the
105 readonly data section) or else you can #define the symbols
106 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
107 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
108 #define USE_CONST_SECTION 1
110 /* Support for Constructors and Destructors. */
111 #define READONLY_DATA_SECTION() const_section ()
113 /* A default list of other sections which we might be "in" at any given
114 time. For targets that use additional sections (e.g. .tdesc) you
115 should override this definition in the target-specific file which
116 includes this file. */
117 #define SUBTARGET_EXTRA_SECTIONS in_const,
119 /* A default list of extra section function definitions. For targets
120 that use additional sections (e.g. .tdesc) you should override this
121 definition in the target-specific file which includes this file. */
122 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS CONST_SECTION_FUNCTION
124 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
126 #define CONST_SECTION_FUNCTION \
130 if (!USE_CONST_SECTION) \
132 else if (in_section != in_const) \
134 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
135 in_section = in_const; \
139 /* Switch into a generic section.
140 This is currently only used to support section attributes.
142 We make the section read-only and executable for a function decl,
143 read-only for a const data decl, and writable for a non-const data decl. */
144 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
145 fprintf (FILE, ".section\t%s,\"%s\",%%progbits\n", NAME, \
146 (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
147 (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")
149 /* A C statement or statements to switch to the appropriate
150 section for output of DECL. DECL is either a `VAR_DECL' node
151 or a constant of some sort. RELOC indicates whether forming
152 the initial value of DECL requires link-time relocations. */
153 #define SELECT_SECTION(DECL,RELOC) \
155 if (TREE_CODE (DECL) == STRING_CST) \
157 if (! flag_writable_strings) \
162 else if (TREE_CODE (DECL) == VAR_DECL) \
164 if ((flag_pic && RELOC) \
165 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
166 || !DECL_INITIAL (DECL) \
167 || (DECL_INITIAL (DECL) != error_mark_node \
168 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
177 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
178 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
180 #define UNIQUE_SECTION(DECL, RELOC) \
188 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
190 if (! DECL_ONE_ONLY (DECL)) \
193 if (TREE_CODE (DECL) == FUNCTION_DECL) \
195 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
196 prefix = ".rodata."; \
200 else if (TREE_CODE (DECL) == FUNCTION_DECL) \
201 prefix = ".gnu.linkonce.t."; \
202 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
203 prefix = ".gnu.linkonce.r."; \
205 prefix = ".gnu.linkonce.d."; \
207 len = strlen (name) + strlen (prefix); \
208 string = alloca (len + 1); \
209 sprintf (string, "%s%s", prefix, name); \
211 DECL_SECTION_NAME (DECL) = build_string (len, string); \
215 /* A C statement or statements to switch to the appropriate
216 section for output of RTX in mode MODE. RTX is some kind
217 of constant in RTL. The argument MODE is redundant except
218 in the case of a `const_int' rtx. Currently, these always
219 go into the const section. */
220 #define SELECT_RTX_SECTION(MODE,RTX) const_section ()
222 /* On svr4, we *do* have support for the .init and .fini sections, and we
223 can put stuff in there to be executed before and after `main'. We let
224 crtstuff.c and other files know this by defining the following symbols.
225 The definitions say how to change sections to the .init and .fini
226 sections. This is the same for all known svr4 assemblers. */
227 #define INIT_SECTION_ASM_OP "\t.section\t.init"
228 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
231 /* This is how we tell the assembler that a symbol is weak. */
232 #define ASM_WEAKEN_LABEL(FILE,NAME) \
233 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
234 fputc ('\n', FILE); } while (0)
236 /* This is how we tell the assembler that two symbols have the same value. */
238 #define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
239 do { assemble_name (FILE, NAME1); \
240 fputs (" = ", FILE); \
241 assemble_name (FILE, NAME2); \
242 fputc ('\n', FILE); } while (0)
244 /* Make DWARF2 an option, but keep DBX as the default for now.
245 Use -gdwarf-2 to turn on DWARF2. */
246 #define DWARF2_DEBUGGING_INFO
247 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
249 /* Get the standard ELF stabs definitions. */
253 #include "arm/linux-gas.h"
255 /* NWFPE always understands FPA instructions. */
257 #define FP_DEFAULT FP_SOFT3
259 /* Call the function profiler with a given profile label. */
260 #undef ARM_FUNCTION_PROFILER
261 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO) \
263 fprintf (STREAM, "\tbl\tmcount%s\n", NEED_PLT_RELOC ? "(PLT)" : ""); \
267 #define CC1_SPEC "%{profile:-p}"