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 /* Handle #pragma weak and #pragma pack. */
37 #define HANDLE_SYSV_PRAGMA
39 /* Now we define the strings used to build the spec file. */
42 %{!shared: %{pthread:-lpthread} \
43 %{profile:-lc_p} %{!profile: -lc}}"
46 #define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
48 /* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
49 the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
50 provides part of the support for getting C++ file-scope static
51 object constructed before entering `main'. */
53 #define STARTFILE_SPEC \
55 %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
56 %{!p:%{profile:gcrt1.o%s} \
57 %{!profile:crt1.o%s}}}} \
58 crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
60 /* Provide a ENDFILE_SPEC appropriate for GNU/Linux. Here we tack on
61 the GNU/Linux magical crtend.o file (see crtstuff.c) which
62 provides part of the support for getting C++ file-scope static
63 object constructed before entering `main', followed by a normal
64 GNU/Linux "finalizer" file, `crtn.o'. */
66 #define ENDFILE_SPEC \
67 "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
69 #define LINK_SPEC "%{h*} %{version:-v} \
73 %{symbolic:-Bsymbolic} \
74 %{rdynamic:-export-dynamic} \
75 %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
78 SUBTARGET_EXTRA_LINK_SPEC
81 #define CPP_PREDEFINES \
82 "-Dunix -Dlinux -D__ELF__ \
83 -Asystem=unix -Asystem=posix -Acpu=arm -Amachine=arm"
85 /* Allow #sccs in preprocessor. */
86 #define SCCS_DIRECTIVE
88 #define USER_LABEL_PREFIX "" /* For ELF the default is no underscores */
89 #define LOCAL_LABEL_PREFIX "."
91 #define IDENT_ASM_OP "\t.ident\t"
93 /* Output #ident as a .ident. */
94 #define ASM_OUTPUT_IDENT(FILE, NAME) \
95 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
97 /* Support const sections and the ctors and dtors sections for g++.
98 Note that there appears to be two different ways to support const
99 sections at the moment. You can either #define the symbol
100 READONLY_DATA_SECTION (giving it some code which switches to the
101 readonly data section) or else you can #define the symbols
102 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
103 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
104 #define USE_CONST_SECTION 1
106 /* Support for Constructors and Destructors. */
107 #define READONLY_DATA_SECTION() const_section ()
109 /* A default list of other sections which we might be "in" at any given
110 time. For targets that use additional sections (e.g. .tdesc) you
111 should override this definition in the target-specific file which
112 includes this file. */
113 #define SUBTARGET_EXTRA_SECTIONS in_const,
115 /* A default list of extra section function definitions. For targets
116 that use additional sections (e.g. .tdesc) you should override this
117 definition in the target-specific file which includes this file. */
118 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS CONST_SECTION_FUNCTION
120 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
122 #define CONST_SECTION_FUNCTION \
126 if (!USE_CONST_SECTION) \
128 else if (in_section != in_const) \
130 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
131 in_section = in_const; \
135 /* Switch into a generic section. */
136 #define TARGET_ASM_NAMED_SECTION arm_elf_asm_named_section
138 /* A C statement or statements to switch to the appropriate
139 section for output of DECL. DECL is either a `VAR_DECL' node
140 or a constant of some sort. RELOC indicates whether forming
141 the initial value of DECL requires link-time relocations. */
142 #define SELECT_SECTION(DECL,RELOC,ALIGN) \
144 if (TREE_CODE (DECL) == STRING_CST) \
146 if (! flag_writable_strings) \
151 else if (TREE_CODE (DECL) == VAR_DECL) \
153 if ((flag_pic && RELOC) \
154 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
155 || !DECL_INITIAL (DECL) \
156 || (DECL_INITIAL (DECL) != error_mark_node \
157 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
166 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
167 #define UNIQUE_SECTION(DECL, RELOC) \
175 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
177 if (! DECL_ONE_ONLY (DECL)) \
180 if (TREE_CODE (DECL) == FUNCTION_DECL) \
182 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
183 prefix = ".rodata."; \
187 else if (TREE_CODE (DECL) == FUNCTION_DECL) \
188 prefix = ".gnu.linkonce.t."; \
189 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
190 prefix = ".gnu.linkonce.r."; \
192 prefix = ".gnu.linkonce.d."; \
194 len = strlen (name) + strlen (prefix); \
195 string = alloca (len + 1); \
196 sprintf (string, "%s%s", prefix, name); \
198 DECL_SECTION_NAME (DECL) = build_string (len, string); \
202 /* A C statement or statements to switch to the appropriate
203 section for output of RTX in mode MODE. RTX is some kind
204 of constant in RTL. The argument MODE is redundant except
205 in the case of a `const_int' rtx. Currently, these always
206 go into the const section. */
207 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN) const_section ()
209 /* On svr4, we *do* have support for the .init and .fini sections, and we
210 can put stuff in there to be executed before and after `main'. We let
211 crtstuff.c and other files know this by defining the following symbols.
212 The definitions say how to change sections to the .init and .fini
213 sections. This is the same for all known svr4 assemblers. */
214 #define INIT_SECTION_ASM_OP "\t.section\t.init"
215 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
218 /* This is how we tell the assembler that a symbol is weak. */
219 #define ASM_WEAKEN_LABEL(FILE,NAME) \
220 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
221 fputc ('\n', FILE); } while (0)
223 /* This is how we tell the assembler that two symbols have the same value. */
225 #define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
226 do { assemble_name (FILE, NAME1); \
227 fputs (" = ", FILE); \
228 assemble_name (FILE, NAME2); \
229 fputc ('\n', FILE); } while (0)
231 /* Make DWARF2 an option, but keep DBX as the default for now.
232 Use -gdwarf-2 to turn on DWARF2. */
233 #define DWARF2_DEBUGGING_INFO
234 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
236 /* Get the standard ELF stabs definitions. */
240 #include "arm/linux-gas.h"
242 /* NWFPE always understands FPA instructions. */
244 #define FP_DEFAULT FP_SOFT3
246 /* Call the function profiler with a given profile label. */
247 #undef ARM_FUNCTION_PROFILER
248 #define ARM_FUNCTION_PROFILER(STREAM, LABELNO) \
250 fprintf (STREAM, "\tbl\tmcount%s\n", NEED_PLT_RELOC ? "(PLT)" : ""); \
254 #define CC1_SPEC "%{profile:-p}"