246 lines
8.6 KiB
C
246 lines
8.6 KiB
C
/* Definitions for ARM running Linux-based GNU systems using ELF
|
|
Copyright (C) 1993, 1994, 1997, 1998, 1999 Free Software Foundation, Inc.
|
|
Contributed by Philip Blundell <philb@gnu.org>
|
|
|
|
This file is part of GNU CC.
|
|
|
|
GNU CC is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU CC is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
/* Run-time Target Specification. */
|
|
#define TARGET_VERSION fputs (" (ARM GNU/Linux with ELF)", stderr);
|
|
|
|
/* We have libgcc2. */
|
|
#define HAVE_ATEXIT
|
|
|
|
/* Default is to use APCS-32 mode. */
|
|
#ifndef SUBTARGET_DEFAULT_APCS26
|
|
#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
|
|
#define SUBTARGET_EXTRA_LINK_SPEC \
|
|
" %{mapcs-26:-m elf32arm26} %{!mapcs-26:-m elf32arm}"
|
|
#define SUBTARGET_EXTRA_ASM_SPEC \
|
|
" %{mapcs-26:-mapcs-26} %(!mapcs-26:-mapcs-32}"
|
|
#endif
|
|
|
|
/* This was defined in linux.h. Define it here also. */
|
|
#undef DEFAULT_VTABLE_THUNKS
|
|
#define DEFAULT_VTABLE_THUNKS 1
|
|
|
|
/* Handle #pragma weak and #pragma pack. */
|
|
#define HANDLE_SYSV_PRAGMA
|
|
|
|
/* Now we define the strings used to build the spec file. */
|
|
#define LIB_SPEC \
|
|
"%{shared: -lc} \
|
|
%{!shared: %{pthread:-lpthread} \
|
|
%{profile:-lc_p} %{!profile: -lc}}"
|
|
|
|
#define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
|
|
|
|
/* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
|
|
the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
|
|
provides part of the support for getting C++ file-scope static
|
|
object constructed before entering `main'. */
|
|
|
|
#define STARTFILE_SPEC \
|
|
"%{!shared: \
|
|
%{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
|
|
%{!p:%{profile:gcrt1.o%s} \
|
|
%{!profile:crt1.o%s}}}} \
|
|
crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
|
|
|
|
/* Provide a ENDFILE_SPEC appropriate for GNU/Linux. Here we tack on
|
|
the GNU/Linux magical crtend.o file (see crtstuff.c) which
|
|
provides part of the support for getting C++ file-scope static
|
|
object constructed before entering `main', followed by a normal
|
|
GNU/Linux "finalizer" file, `crtn.o'. */
|
|
|
|
#define ENDFILE_SPEC \
|
|
"%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
|
|
|
|
#define LINK_SPEC "%{h*} %{version:-v} \
|
|
%{b} %{Wl,*:%*} \
|
|
%{static:-Bstatic} \
|
|
%{shared:-shared} \
|
|
%{symbolic:-Bsymbolic} \
|
|
%{rdynamic:-export-dynamic} \
|
|
%{!dynamic-linker:-dynamic-linker /lib/ld-linux.so.2} \
|
|
-X \
|
|
%{mbig-endian:-EB}" \
|
|
SUBTARGET_EXTRA_LINK_SPEC
|
|
|
|
#undef CPP_PREDEFINES
|
|
#define CPP_PREDEFINES \
|
|
"-Dunix -Darm -Dlinux -Asystem(unix) -Asystem(posix) -Acpu(arm) \
|
|
-Amachine(arm) -D__ELF__ -Darm_elf"
|
|
|
|
#ifndef SUBTARGET_DEFAULT_APCS26
|
|
#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
|
|
#endif
|
|
|
|
/* Allow #sccs in preprocessor. */
|
|
#define SCCS_DIRECTIVE
|
|
|
|
#define USER_LABEL_PREFIX "" /* For ELF the default is no underscores */
|
|
#define LOCAL_LABEL_PREFIX "."
|
|
|
|
/* Attach a special .ident directive to the end of the file to identify
|
|
the version of GCC which compiled this code. */
|
|
#define IDENT_ASM_OP ".ident"
|
|
|
|
/* Output #ident as a .ident. */
|
|
#define ASM_OUTPUT_IDENT(FILE, NAME) \
|
|
fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
|
|
|
|
#ifdef IDENTIFY_WITH_IDENT
|
|
#define ASM_IDENTIFY_GCC(FILE) /* nothing */
|
|
#define ASM_IDENTIFY_LANGUAGE(FILE) \
|
|
fprintf (FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP, \
|
|
lang_identify (), version_string)
|
|
#else
|
|
#define ASM_FILE_END(FILE) \
|
|
do { \
|
|
if (!flag_no_ident) \
|
|
fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
|
|
IDENT_ASM_OP, version_string); \
|
|
} while (0)
|
|
#endif
|
|
|
|
/* Support const sections and the ctors and dtors sections for g++.
|
|
Note that there appears to be two different ways to support const
|
|
sections at the moment. You can either #define the symbol
|
|
READONLY_DATA_SECTION (giving it some code which switches to the
|
|
readonly data section) or else you can #define the symbols
|
|
EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
|
|
SELECT_RTX_SECTION. We do both here just to be on the safe side. */
|
|
#define USE_CONST_SECTION 1
|
|
|
|
/* Support for Constructors and Destructors. */
|
|
#define READONLY_DATA_SECTION() const_section ()
|
|
|
|
/* A default list of other sections which we might be "in" at any given
|
|
time. For targets that use additional sections (e.g. .tdesc) you
|
|
should override this definition in the target-specific file which
|
|
includes this file. */
|
|
#define SUBTARGET_EXTRA_SECTIONS in_const,
|
|
|
|
/* A default list of extra section function definitions. For targets
|
|
that use additional sections (e.g. .tdesc) you should override this
|
|
definition in the target-specific file which includes this file. */
|
|
#define SUBTARGET_EXTRA_SECTION_FUNCTIONS CONST_SECTION_FUNCTION
|
|
|
|
extern void text_section ();
|
|
|
|
#define CONST_SECTION_ASM_OP ".section\t.rodata"
|
|
|
|
#define CONST_SECTION_FUNCTION \
|
|
void \
|
|
const_section () \
|
|
{ \
|
|
if (!USE_CONST_SECTION) \
|
|
text_section (); \
|
|
else if (in_section != in_const) \
|
|
{ \
|
|
fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
|
|
in_section = in_const; \
|
|
} \
|
|
}
|
|
|
|
/* Switch into a generic section.
|
|
This is currently only used to support section attributes.
|
|
|
|
We make the section read-only and executable for a function decl,
|
|
read-only for a const data decl, and writable for a non-const data decl. */
|
|
#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
|
|
fprintf (FILE, ".section\t%s,\"%s\",%%progbits\n", NAME, \
|
|
(DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
|
|
(DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")
|
|
|
|
/* A C statement or statements to switch to the appropriate
|
|
section for output of DECL. DECL is either a `VAR_DECL' node
|
|
or a constant of some sort. RELOC indicates whether forming
|
|
the initial value of DECL requires link-time relocations. */
|
|
#define SELECT_SECTION(DECL,RELOC) \
|
|
{ \
|
|
if (TREE_CODE (DECL) == STRING_CST) \
|
|
{ \
|
|
if (! flag_writable_strings) \
|
|
const_section (); \
|
|
else \
|
|
data_section (); \
|
|
} \
|
|
else if (TREE_CODE (DECL) == VAR_DECL) \
|
|
{ \
|
|
if ((flag_pic && RELOC) \
|
|
|| !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
|
|
|| !DECL_INITIAL (DECL) \
|
|
|| (DECL_INITIAL (DECL) != error_mark_node \
|
|
&& !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
|
|
data_section (); \
|
|
else \
|
|
const_section (); \
|
|
} \
|
|
else \
|
|
const_section (); \
|
|
}
|
|
|
|
/* A C statement or statements to switch to the appropriate
|
|
section for output of RTX in mode MODE. RTX is some kind
|
|
of constant in RTL. The argument MODE is redundant except
|
|
in the case of a `const_int' rtx. Currently, these always
|
|
go into the const section. */
|
|
#define SELECT_RTX_SECTION(MODE,RTX) const_section ()
|
|
|
|
/* On svr4, we *do* have support for the .init and .fini sections, and we
|
|
can put stuff in there to be executed before and after `main'. We let
|
|
crtstuff.c and other files know this by defining the following symbols.
|
|
The definitions say how to change sections to the .init and .fini
|
|
sections. This is the same for all known svr4 assemblers. */
|
|
#define INIT_SECTION_ASM_OP ".section\t.init"
|
|
#define FINI_SECTION_ASM_OP ".section\t.fini"
|
|
|
|
|
|
/* This is how we tell the assembler that a symbol is weak. */
|
|
#define ASM_WEAKEN_LABEL(FILE,NAME) \
|
|
do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
|
|
fputc ('\n', FILE); } while (0)
|
|
|
|
/* This is how we tell the assembler that two symbols have the same value. */
|
|
|
|
#define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
|
|
do { assemble_name (FILE, NAME1); \
|
|
fputs (" = ", FILE); \
|
|
assemble_name (FILE, NAME2); \
|
|
fputc ('\n', FILE); } while (0)
|
|
|
|
/* Make DWARF2 an option, but keep DBX as the default for now.
|
|
Use -gdwarf-2 to turn on DWARF2. */
|
|
#define DWARF2_DEBUGGING_INFO
|
|
#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
|
|
|
|
/* Get the standard ELF stabs definitions. */
|
|
#include "dbxelf.h"
|
|
|
|
#include "arm/elf.h"
|
|
#include "arm/linux-gas.h"
|
|
|
|
#ifndef SUBTARGET_DEFAULT_APCS26
|
|
/* On 32-bit machine it is always safe to assume we have the "new"
|
|
floating point system.
|
|
?? Make this happen for all targets when NWFPE is better established. */
|
|
#undef FP_DEFAULT
|
|
#define FP_DEFAULT FP_SOFT3
|
|
#endif
|