1 /* Definitions for ARM running Linux-based GNU systems using ELF
2 Copyright (C) 1993, 1994, 1997, 1998, 1999 Free Software Foundation, Inc.
3 Contributed by Philip Blundell <philb@gnu.org>
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Run-time Target Specification. */
23 #define TARGET_VERSION fputs (" (ARM GNU/Linux with ELF)", stderr);
25 /* We have libgcc2. */
28 /* Default is to use APCS-32 mode. */
29 #ifndef SUBTARGET_DEFAULT_APCS26
30 #define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
31 #define SUBTARGET_EXTRA_LINK_SPEC \
32 " %{mapcs-26:-m elf32arm26} %{!mapcs-26:-m elf32arm}"
33 #define SUBTARGET_EXTRA_ASM_SPEC \
34 " %{mapcs-26:-mapcs-26} %(!mapcs-26:-mapcs-32}"
37 /* This was defined in linux.h. Define it here also. */
38 #undef DEFAULT_VTABLE_THUNKS
39 #define DEFAULT_VTABLE_THUNKS 1
41 /* Handle #pragma weak and #pragma pack. */
42 #define HANDLE_SYSV_PRAGMA
44 /* Now we define the strings used to build the spec file. */
47 %{!shared: %{pthread:-lpthread} \
48 %{profile:-lc_p} %{!profile: -lc}}"
50 #define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
52 /* Add the compiler's crtend, and the library's crtn. */
53 #define ENDFILE_SPEC "%{!shared:crtend.o%s} %{shared:crtendS.o%s} \
54 %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
56 #define STARTFILE_SPEC "%{!shared:crt1.o%s} \
58 %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
60 #define LINK_SPEC "%{h*} %{version:-v} \
64 %{symbolic:-Bsymbolic} \
65 %{rdynamic:-export-dynamic} \
66 %{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
69 SUBTARGET_EXTRA_LINK_SPEC
72 #define CPP_PREDEFINES \
73 "-Dunix -Darm -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(arm) \
74 -Amachine(arm) -D__ELF__ -Darm_elf"
76 #ifndef SUBTARGET_DEFAULT_APCS26
77 #undef CPP_APCS_PC_DEFAULT_SPEC
78 #define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
79 /* On 32-bit machine it is always safe to assume we have the "new"
80 floating point system. */
82 #define FP_DEFAULT FP_SOFT3
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 /* Attach a special .ident directive to the end of the file to identify
92 the version of GCC which compiled this code. */
93 #define IDENT_ASM_OP ".ident"
95 /* Output #ident as a .ident. */
96 #define ASM_OUTPUT_IDENT(FILE, NAME) \
97 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
99 #ifdef IDENTIFY_WITH_IDENT
100 #define ASM_IDENTIFY_GCC(FILE) /* nothing */
101 #define ASM_IDENTIFY_LANGUAGE(FILE) \
102 fprintf (FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP, \
103 lang_identify (), version_string)
105 #define ASM_FILE_END(FILE) \
107 if (!flag_no_ident) \
108 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
109 IDENT_ASM_OP, version_string); \
113 /* Support const sections and the ctors and dtors sections for g++.
114 Note that there appears to be two different ways to support const
115 sections at the moment. You can either #define the symbol
116 READONLY_DATA_SECTION (giving it some code which switches to the
117 readonly data section) or else you can #define the symbols
118 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
119 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
120 #define USE_CONST_SECTION 1
122 /* Support for Constructors and Destructors. */
123 #define READONLY_DATA_SECTION() const_section ()
125 /* A default list of other sections which we might be "in" at any given
126 time. For targets that use additional sections (e.g. .tdesc) you
127 should override this definition in the target-specific file which
128 includes this file. */
129 #define SUBTARGET_EXTRA_SECTIONS in_const,
131 /* A default list of extra section function definitions. For targets
132 that use additional sections (e.g. .tdesc) you should override this
133 definition in the target-specific file which includes this file. */
134 #define SUBTARGET_EXTRA_SECTION_FUNCTIONS CONST_SECTION_FUNCTION
136 extern void text_section ();
138 #define CONST_SECTION_ASM_OP ".section\t.rodata"
140 #define CONST_SECTION_FUNCTION \
144 if (!USE_CONST_SECTION) \
146 else if (in_section != in_const) \
148 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
149 in_section = in_const; \
153 /* Switch into a generic section.
154 This is currently only used to support section attributes.
156 We make the section read-only and executable for a function decl,
157 read-only for a const data decl, and writable for a non-const data decl. */
158 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
159 fprintf (FILE, ".section\t%s,\"%s\",%%progbits\n", NAME, \
160 (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
161 (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")
163 /* A C statement or statements to switch to the appropriate
164 section for output of DECL. DECL is either a `VAR_DECL' node
165 or a constant of some sort. RELOC indicates whether forming
166 the initial value of DECL requires link-time relocations. */
167 #define SELECT_SECTION(DECL,RELOC) \
169 if (TREE_CODE (DECL) == STRING_CST) \
171 if (! flag_writable_strings) \
176 else if (TREE_CODE (DECL) == VAR_DECL) \
178 if ((flag_pic && RELOC) \
179 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
180 || !DECL_INITIAL (DECL) \
181 || (DECL_INITIAL (DECL) != error_mark_node \
182 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
191 /* A C statement or statements to switch to the appropriate
192 section for output of RTX in mode MODE. RTX is some kind
193 of constant in RTL. The argument MODE is redundant except
194 in the case of a `const_int' rtx. Currently, these always
195 go into the const section. */
196 #define SELECT_RTX_SECTION(MODE,RTX) const_section ()
198 /* On svr4, we *do* have support for the .init and .fini sections, and we
199 can put stuff in there to be executed before and after `main'. We let
200 crtstuff.c and other files know this by defining the following symbols.
201 The definitions say how to change sections to the .init and .fini
202 sections. This is the same for all known svr4 assemblers. */
203 #define INIT_SECTION_ASM_OP ".section\t.init"
204 #define FINI_SECTION_ASM_OP ".section\t.fini"
207 /* This is how we tell the assembler that a symbol is weak. */
208 #define ASM_WEAKEN_LABEL(FILE,NAME) \
209 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
210 fputc ('\n', FILE); } while (0)
212 /* This is how we tell the assembler that two symbols have the same value. */
214 #define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
215 do { assemble_name (FILE, NAME1); \
216 fputs (" = ", FILE); \
217 assemble_name (FILE, NAME2); \
218 fputc ('\n', FILE); } while (0)
220 /* Make DWARF2 an option, but keep DBX as the default for now.
221 Use -gdwarf2 to turn on DWARF2. */
222 #define DWARF2_DEBUGGING_INFO
223 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
226 #include "arm/linux-gas.h"