217 lines
7.0 KiB
C
217 lines
7.0 KiB
C
/* Definitions for DEC AXP Alpha running FreeBSD using the ELF format
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by David O'Brien <obrien@FreeBSD.org>
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* This is used on Alpha platforms that use the ELF format.
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This was taken from the NetBSD configuration, and modified
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for FreeBSD/Alpha by Hidetoshi Shimokawa <simokawa@FreeBSD.ORG> */
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/* $FreeBSD$ */
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/* Names to predefine in the preprocessor for this target machine.
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XXX FreeBSD, by convention, shouldn't do __alpha, but lots of applications
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expect it because that's what OSF/1 does. */
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#undef CPP_PREDEFINES
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#define CPP_PREDEFINES \
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"-D__alpha__ -D__alpha -Acpu(alpha) -Amachine(alpha)" \
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FBSD_CPP_PREDEFINES
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#undef LINK_SPEC
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#define LINK_SPEC "-m elf64alpha \
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%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
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%{Wl,*:%*} \
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%{assert*} %{R*} %{rpath*} %{defsym*} \
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%{shared:-Bshareable %{h*} %{soname*}} \
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%{symbolic:-Bsymbolic} \
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%{!shared: \
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%{!static: \
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%{rdynamic:-export-dynamic} \
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%{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}} \
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%{static:-Bstatic}}"
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/* Provide an ASM_SPEC appropriate for a FreeBSD/Alpha target. This differs
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from the generic FreeBSD ASM_SPEC in that no special handling of PIC is
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necessary on the Alpha. */
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#undef ASM_SPEC
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#define ASM_SPEC " %| %{mcpu=*:-m%*}"
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#undef ASM_FINAL_SPEC
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/* Provide a STARTFILE_SPEC for FreeBSD that is compatible with the
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non-aout version used on i386. */
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#undef STARTFILE_SPEC
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#define STARTFILE_SPEC \
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"%{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}} \
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crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
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/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
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magical crtend.o file which provides part of the support for
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getting C++ file-scope static object constructed before entering
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`main', followed by a normal ELF "finalizer" file, `crtn.o'. */
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#undef ENDFILE_SPEC
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#define ENDFILE_SPEC \
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"%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
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/************************[ Target stuff ]***********************************/
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/* Define the actual types of some ANSI-mandated types.
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Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c,
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c-common.c, and config/<arch>/<arch>.h. */
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/* alpha.h gets this wrong for FreeBSD. We use the GCC defaults instead. */
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#undef WCHAR_TYPE
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/* Handle cross-compilation on 32-bits machines (such as i386) for 64-bits
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machines (Alpha in this case). */
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#if defined(__i386__)
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#undef HOST_BITS_PER_LONG
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#define HOST_BITS_PER_LONG 32
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#undef HOST_WIDE_INT
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#define HOST_WIDE_INT long long
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#undef HOST_BITS_PER_WIDE_INT
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#define HOST_BITS_PER_WIDE_INT 64
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#endif
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/* This is the pseudo-op used to generate a 64-bit word of data with a
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specific value in some section. */
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#undef INT_ASM_OP
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#define INT_ASM_OP ".quad"
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#undef TARGET_VERSION
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#define TARGET_VERSION fprintf (stderr, " (FreeBSD/Alpha ELF)");
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#define TARGET_AOUT (0)
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#define TARGET_ELF (1)
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#define TARGET_UNDERSCORES (0)
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#undef OBJECT_FORMAT_COFF
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#undef EXTENDED_COFF
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#undef TARGET_DEFAULT
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#define TARGET_DEFAULT (MASK_FP | MASK_FPREGS | MASK_GAS)
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#undef HAS_INIT_SECTION
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/* Output assembler code to FILE to increment profiler label # LABELNO
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for profiling a function entry. Under FreeBSD/Alpha, the assembler does
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nothing special with -pg. */
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#undef FUNCTION_PROFILER
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#define FUNCTION_PROFILER(FILE, LABELNO) \
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fputs ("\tjsr $28,_mcount\n", (FILE)) /* at */
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/* Show that we need a GP when profiling. */
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#undef TARGET_PROFILING_NEEDS_GP
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#define TARGET_PROFILING_NEEDS_GP
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/* We always use gas here, so we don't worry about ECOFF assembler problems. */
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#undef TARGET_GAS
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#define TARGET_GAS 1
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/************************[ Assembler stuff ]********************************/
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/* This is how to begin an assembly language file.
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ELF also needs a .version. */
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#undef ASM_FILE_START
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#define ASM_FILE_START(FILE) \
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{ \
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alpha_write_verstamp (FILE); \
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output_file_directive ((FILE), main_input_filename); \
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fprintf ((FILE), "\t.version\t\"01.01\"\n"); \
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fprintf ((FILE), "\t.set noat\n"); \
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}
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extern void output_file_directive ();
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extern void alpha_output_lineno ();
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#undef ASM_OUTPUT_SOURCE_LINE
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#define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE) \
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alpha_output_lineno ((STREAM), (LINE))
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/* Switch into a generic section.
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This is currently only used to support section attributes.
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We make the section read-only and executable for a function decl,
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read-only for a const data decl, and writable for a non-const data decl. */
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#undef ASM_OUTPUT_SECTION_NAME
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#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
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fprintf ((FILE), ".section\t%s,\"%s\",@progbits\n", (NAME), \
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(DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
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(DECL) && DECL_READONLY_SECTION ((DECL), (RELOC)) ? "a" : "aw")
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/* A C statement or statements to switch to the appropriate
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section for output of DECL. DECL is either a `VAR_DECL' node
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or a constant of some sort. RELOC indicates whether forming
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the initial value of DECL requires link-time relocations. */
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#undef SELECT_SECTION
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#define SELECT_SECTION(DECL, RELOC) \
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{ \
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if (TREE_CODE (DECL) == STRING_CST) \
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{ \
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if (! flag_writable_strings) \
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const_section (); \
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else \
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data_section (); \
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} \
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else if (TREE_CODE (DECL) == VAR_DECL) \
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{ \
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if ((flag_pic && (RELOC)) \
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|| !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
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|| !DECL_INITIAL (DECL) \
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|| (DECL_INITIAL (DECL) != error_mark_node \
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&& !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
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data_section (); \
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else \
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const_section (); \
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} \
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else \
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const_section (); \
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}
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/* This is how we tell the assembler that two symbols have the same value. */
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#undef ASM_OUTPUT_DEF
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#define ASM_OUTPUT_DEF(FILE,NAME1,NAME2) \
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do { \
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assemble_name((FILE), (NAME1)); \
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fputs(" = ", (FILE)); \
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assemble_name((FILE), (NAME2)); \
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fputc('\n', (FILE)); \
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} while (0)
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/************************[ Debugger stuff ]*********************************/
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/* This is the char to use for continuation (in case we need to turn
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continuation back on). */
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#undef DBX_CONTIN_CHAR
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#define DBX_CONTIN_CHAR '?'
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