548 lines
19 KiB
C
548 lines
19 KiB
C
/* Definitions of target machine for GNU compiler,
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for Alpha FreeBSD systems.
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Copyright (C) 1998 Free Software Foundation, Inc.
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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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#undef OBJECT_FORMAT_COFF
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#undef EXTENDED_COFF
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#define OBJECT_FORMAT_ELF
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/* This is BSD, so it wants DBX format. */
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#define DBX_DEBUGGING_INFO
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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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#undef ASM_FINAL_SPEC
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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 TARGET_VERSION
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#define TARGET_VERSION fprintf (stderr, " (FreeBSD/alpha ELF)");
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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 CPP_PREDEFINES
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#define CPP_PREDEFINES \
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"-D__alpha__ -D__alpha -D__ELF__ -Acpu(alpha) -Amachine(alpha)" \
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CPP_FBSD_PREDEFINES
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#undef CPP_SPEC
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#define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
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/* Make gcc agree with <machine/ansi.h> */
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#undef WCHAR_TYPE
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#define WCHAR_TYPE "int"
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#undef WCHAR_UNSIGNED
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#define WCHAR_UNSIGNED 0
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE 32
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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))
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/* Show that we need a GP when profiling. */
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#define TARGET_PROFILING_NEEDS_GP
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#undef HAS_INIT_SECTION
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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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/* Output at beginning of assembler file. */
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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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#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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extern void alpha_output_lineno ();
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extern void output_file_directive ();
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/* Attach a special .ident directive to the end of the file to identify
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the version of GCC which compiled this code. The format of the
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.ident string is patterned after the ones produced by native svr4
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C compilers. */
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#undef IDENT_ASM_OP
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#define IDENT_ASM_OP ".ident"
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#ifdef IDENTIFY_WITH_IDENT
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#undef ASM_IDENTIFY_GCC
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#define ASM_IDENTIFY_GCC(FILE) /* nothing */
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#undef ASM_IDENTIFY_LANGUAGE
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#define ASM_IDENTIFY_LANGUAGE(FILE) \
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fprintf(FILE, "\t%s \"GCC (%s) %s\"\n", IDENT_ASM_OP, \
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lang_identify(), version_string)
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#else
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#undef ASM_FILE_END
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#define ASM_FILE_END(FILE) \
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do { \
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fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
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IDENT_ASM_OP, version_string); \
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} while (0)
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#endif
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/* Allow #sccs in preprocessor. */
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#define SCCS_DIRECTIVE
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/* Output #ident as a .ident. */
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#undef ASM_OUTPUT_IDENT
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#define ASM_OUTPUT_IDENT(FILE, NAME) \
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fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
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/* This is how to allocate empty space in some section. The .zero
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pseudo-op is used for this on most svr4 assemblers. */
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#undef SKIP_ASM_OP
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#define SKIP_ASM_OP ".zero"
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#undef ASM_OUTPUT_SKIP
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#define ASM_OUTPUT_SKIP(FILE,SIZE) \
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fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
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/* Output the label which precedes a jumptable. Note that for all svr4
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systems where we actually generate jumptables (which is to say every
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svr4 target except i386, where we use casesi instead) we put the jump-
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tables into the .rodata section and since other stuff could have been
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put into the .rodata section prior to any given jumptable, we have to
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make sure that the location counter for the .rodata section gets pro-
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perly re-aligned prior to the actual beginning of the jump table. */
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#undef ALIGN_ASM_OP
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#define ALIGN_ASM_OP ".align"
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#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
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#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
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ASM_OUTPUT_ALIGN ((FILE), 2);
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#endif
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#undef ASM_OUTPUT_CASE_LABEL
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#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
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do { \
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ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
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ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
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} while (0)
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/* The standard SVR4 assembler seems to require that certain builtin
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library routines (e.g. .udiv) be explicitly declared as .globl
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in each assembly file where they are referenced. */
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#undef ASM_OUTPUT_EXTERNAL_LIBCALL
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#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
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ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
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/* This says how to output assembler code to declare an
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uninitialized external linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#undef COMMON_ASM_OP
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#define COMMON_ASM_OP ".comm"
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#undef ASM_OUTPUT_ALIGNED_COMMON
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#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
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do { \
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fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
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} while (0)
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/* This says how to output assembler code to declare an
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uninitialized internal linkage data object. Under SVR4,
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the linker seems to want the alignment of data objects
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to depend on their types. We do exactly that here. */
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#undef LOCAL_ASM_OP
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#define LOCAL_ASM_OP ".local"
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#undef ASM_OUTPUT_ALIGNED_LOCAL
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#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
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do { \
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fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
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assemble_name ((FILE), (NAME)); \
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fprintf ((FILE), "\n"); \
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ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
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} while (0)
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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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/* This is the pseudo-op used to generate a contiguous sequence of byte
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values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
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AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
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#undef ASCII_DATA_ASM_OP
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#define ASCII_DATA_ASM_OP ".ascii"
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/* Support const sections and the ctors and dtors sections for g++.
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Note that there appears to be two different ways to support const
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sections at the moment. You can either #define the symbol
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READONLY_DATA_SECTION (giving it some code which switches to the
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readonly data section) or else you can #define the symbols
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EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
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SELECT_RTX_SECTION. We do both here just to be on the safe side. */
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#undef USE_CONST_SECTION
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#define USE_CONST_SECTION 1
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#undef CONST_SECTION_ASM_OP
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#define CONST_SECTION_ASM_OP ".section\t.rodata"
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/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
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Note that we want to give these sections the SHF_WRITE attribute
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because these sections will actually contain data (i.e. tables of
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addresses of functions in the current root executable or shared library
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file) and, in the case of a shared library, the relocatable addresses
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will have to be properly resolved/relocated (and then written into) by
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the dynamic linker when it actually attaches the given shared library
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to the executing process. (Note that on SVR4, you may wish to use the
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`-z text' option to the ELF linker, when building a shared library, as
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an additional check that you are doing everything right. But if you do
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use the `-z text' option when building a shared library, you will get
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errors unless the .ctors and .dtors sections are marked as writable
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via the SHF_WRITE attribute.) */
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#undef CTORS_SECTION_ASM_OP
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#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
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#undef DTORS_SECTION_ASM_OP
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#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
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/* On svr4, we *do* have support for the .init and .fini sections, and we
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can put stuff in there to be executed before and after `main'. We let
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crtstuff.c and other files know this by defining the following symbols.
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The definitions say how to change sections to the .init and .fini
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sections. This is the same for all known svr4 assemblers. */
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#undef INIT_SECTION_ASM_OP
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#define INIT_SECTION_ASM_OP ".section\t.init"
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#undef FINI_SECTION_ASM_OP
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#define FINI_SECTION_ASM_OP ".section\t.fini"
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/* A default list of other sections which we might be "in" at any given
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time. For targets that use additional sections (e.g. .tdesc) you
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should override this definition in the target-specific file which
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includes this file. */
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#undef EXTRA_SECTIONS
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#define EXTRA_SECTIONS in_const, in_ctors, in_dtors
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/* A default list of extra section function definitions. For targets
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that use additional sections (e.g. .tdesc) you should override this
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definition in the target-specific file which includes this file. */
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#undef EXTRA_SECTION_FUNCTIONS
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#define EXTRA_SECTION_FUNCTIONS \
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CONST_SECTION_FUNCTION \
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CTORS_SECTION_FUNCTION \
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DTORS_SECTION_FUNCTION
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#undef READONLY_DATA_SECTION
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#define READONLY_DATA_SECTION() const_section ()
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extern void text_section ();
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#undef CONST_SECTION_FUNCTION
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#define CONST_SECTION_FUNCTION \
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void \
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const_section () \
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{ \
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if (!USE_CONST_SECTION) \
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text_section(); \
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else if (in_section != in_const) \
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{ \
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fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
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in_section = in_const; \
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} \
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}
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#undef CTORS_SECTION_FUNCTION
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#define CTORS_SECTION_FUNCTION \
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void \
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ctors_section () \
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{ \
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if (in_section != in_ctors) \
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{ \
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fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
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in_section = in_ctors; \
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} \
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}
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#undef DTORS_SECTION_FUNCTION
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#define DTORS_SECTION_FUNCTION \
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void \
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dtors_section () \
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{ \
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if (in_section != in_dtors) \
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{ \
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fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
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in_section = in_dtors; \
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} \
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}
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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 (sans semicolon) to output an element in the table of
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global constructors. */
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#undef ASM_OUTPUT_CONSTRUCTOR
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#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
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do { \
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ctors_section (); \
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fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, "\n"); \
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} while (0)
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/* A C statement (sans semicolon) to output an element in the table of
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global destructors. */
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#undef ASM_OUTPUT_DESTRUCTOR
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#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
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do { \
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dtors_section (); \
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fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
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assemble_name (FILE, NAME); \
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fprintf (FILE, "\n"); \
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} while (0)
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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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/* A C statement or statements to switch to the appropriate
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section for output of RTX in mode MODE. RTX is some kind
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of constant in RTL. The argument MODE is redundant except
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in the case of a `const_int' rtx. Currently, these always
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go into the const section. */
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#undef SELECT_RTX_SECTION
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#define SELECT_RTX_SECTION(MODE,RTX) const_section()
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/* Define the strings used for the .type, .size and .set directives.
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These strings generally do not vary from one system running svr4 to
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another, but if a given system (e.g. m88k running svr) needs to use
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different pseudo-op names for these, they may be overridden in the
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file which includes this one. */
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#undef TYPE_ASM_OP
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#define TYPE_ASM_OP ".type"
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#undef SIZE_ASM_OP
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#define SIZE_ASM_OP ".size"
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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 { 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); } while (0)
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/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
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ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
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corresponds to a particular byte value [0..255]. For any
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given byte value, if the value in the corresponding table
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position is zero, the given character can be output directly.
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If the table value is 1, the byte must be output as a \ooo
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octal escape. If the tables value is anything else, then the
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byte value should be output as a \ followed by the value
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in the table. Note that we can use standard UN*X escape
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sequences for many control characters, but we don't use
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\a to represent BEL because some svr4 assemblers (e.g. on
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the i386) don't know about that. Also, we don't use \v
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since some versions of gas, such as 2.2 did not accept it. */
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#undef ESCAPES
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#define ESCAPES \
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"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
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\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
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\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
|
|
|
|
/* Some svr4 assemblers have a limit on the number of characters which
|
|
can appear in the operand of a .string directive. If your assembler
|
|
has such a limitation, you should define STRING_LIMIT to reflect that
|
|
limit. Note that at least some svr4 assemblers have a limit on the
|
|
actual number of bytes in the double-quoted string, and that they
|
|
count each character in an escape sequence as one byte. Thus, an
|
|
escape sequence like \377 would count as four bytes.
|
|
|
|
If your target assembler doesn't support the .string directive, you
|
|
should define this to zero.
|
|
*/
|
|
|
|
#undef STRING_LIMIT
|
|
#define STRING_LIMIT ((unsigned) 256)
|
|
|
|
#undef STRING_ASM_OP
|
|
#define STRING_ASM_OP ".string"
|
|
|
|
/*
|
|
* We always use gas here, so we don't worry about ECOFF assembler problems.
|
|
*/
|
|
#undef TARGET_GAS
|
|
#define TARGET_GAS 1
|
|
|
|
#undef PREFERRED_DEBUGGING_TYPE
|
|
#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
|
|
|
|
#undef LINK_SPEC
|
|
#define LINK_SPEC "-m elf64alpha \
|
|
%{p:%e`-p' not supported; use `-pg' and gprof(1)} \
|
|
%{Wl,*:%*} \
|
|
%{assert*} %{R*} %{rpath*} %{defsym*} \
|
|
%{shared:-Bshareable %{h*} %{soname*}} \
|
|
%{symbolic:-Bsymbolic} \
|
|
%{!shared: \
|
|
%{!static: \
|
|
%{rdynamic:-export-dynamic} \
|
|
%{!dynamic-linker:-dynamic-linker /usr/libexec/ld-elf.so.1}} \
|
|
%{static:-Bstatic}}"
|
|
|
|
#undef STARTFILE_SPEC
|
|
#define STARTFILE_SPEC \
|
|
"%{!shared: %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} %{!p:crt1.o%s}}} \
|
|
%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
|
|
|
|
/* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the
|
|
magical crtend.o file which provides part of the support for
|
|
getting C++ file-scope static object constructed before entering
|
|
`main', followed by a normal ELF "finalizer" file, `crtn.o'. */
|
|
|
|
#undef ENDFILE_SPEC
|
|
#define ENDFILE_SPEC \
|
|
"%{!shared:crtend.o%s} %{shared:crtendS.o%s}"
|
|
|
|
/* Implicit library calls should use memcpy, not bcopy, etc. */
|
|
|
|
#define TARGET_MEM_FUNCTIONS
|
|
|
|
/* Handle #pragma weak and #pragma pack. */
|
|
|
|
#define HANDLE_SYSV_PRAGMA
|
|
|
|
/*
|
|
* Some imports from svr4.h in support of shared libraries.
|
|
* Currently, we need the DECLARE_OBJECT_SIZE stuff.
|
|
*/
|
|
|
|
/* This is how we tell the assembler that a symbol is weak. */
|
|
|
|
#undef ASM_WEAKEN_LABEL
|
|
#define ASM_WEAKEN_LABEL(FILE,NAME) \
|
|
do { fputs ("\t.globl\t", FILE); assemble_name (FILE, NAME); \
|
|
fputc ('\n', FILE); \
|
|
fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
|
|
fputc ('\n', FILE); } while (0)
|
|
|
|
/* The following macro defines the format used to output the second
|
|
operand of the .type assembler directive. Different svr4 assemblers
|
|
expect various different forms for this operand. The one given here
|
|
is just a default. You may need to override it in your machine-
|
|
specific tm.h file (depending upon the particulars of your assembler). */
|
|
|
|
#undef TYPE_OPERAND_FMT
|
|
#define TYPE_OPERAND_FMT "@%s"
|
|
|
|
/* Write the extra assembler code needed to declare a function's result.
|
|
Most svr4 assemblers don't require any special declaration of the
|
|
result value, but there are exceptions. */
|
|
|
|
#ifndef ASM_DECLARE_RESULT
|
|
#define ASM_DECLARE_RESULT(FILE, RESULT)
|
|
#endif
|