376 lines
12 KiB
C
376 lines
12 KiB
C
/* Operating system specific defines to be used when targeting GCC for
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generic System V Release 3 system.
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Copyright (C) 1991, 1996 Free Software Foundation, Inc.
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Contributed by Ron Guilmette (rfg@monkeys.com).
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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, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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To use this file, make up a file with a name like:
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?????svr3.h
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where ????? is replaced by the name of the basic hardware that you
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are targeting for. Then, in the file ?????svr3.h, put something
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like:
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#include "?????.h"
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#include "svr3.h"
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followed by any really system-specific defines (or overrides of
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defines) which you find that you need. For example, CPP_PREDEFINES
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is defined here with only the defined -Dunix and -DSVR3. You should
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probably override that in your target-specific ?????svr3.h file
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with a set of defines that includes these, but also contains an
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appropriate define for the type of hardware that you are targeting.
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*/
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/* Define a symbol indicating that we are using svr3.h. */
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#define USING_SVR3_H
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/* Define a symbol so that libgcc* can know what sort of operating
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environment and assembler syntax we are targeting for. */
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#define SVR3_target
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/* Cpp, assembler, linker, library, and startfile spec's. */
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/* You should redefine CPP_PREDEFINES in any file which includes this one.
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The definition should be appropriate for the type of target system
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involved, and it should include any -A (assertion) options which are
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appropriate for the given target system. */
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#undef CPP_PREDEFINES
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/* Output at beginning of assembler file. */
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/* The .file command should always begin the output. */
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#undef ASM_FILE_START
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#define ASM_FILE_START(FILE) \
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do { output_file_directive ((FILE), main_input_filename); \
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if (optimize) ASM_FILE_START_1 (FILE); \
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} while (0)
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/* By default, do nothing: a few machines support .optim, but not most. */
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#undef ASM_FILE_START_1
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#define ASM_FILE_START_1(FILE)
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/* This says how to output an assembler line
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to define a global common symbol. */
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/* We don't use ROUNDED because the standard compiler doesn't,
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and the linker gives error messages if a common symbol
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has more than one length value. */
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#undef ASM_OUTPUT_COMMON
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#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
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( fputs (".comm ", (FILE)), \
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assemble_name ((FILE), (NAME)), \
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fprintf ((FILE), ",%u\n", (SIZE)))
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/* This says how to output an assembler line
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to define a local common symbol. */
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/* Note that using bss_section here caused errors
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in building shared libraries on system V.3. */
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#undef ASM_OUTPUT_LOCAL
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#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
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do { \
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int align = exact_log2 (ROUNDED); \
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if (align > 2) align = 2; \
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data_section (); \
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ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
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ASM_OUTPUT_LABEL ((FILE), (NAME)); \
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fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
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} while (0)
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#if 0 /* For now, let's leave these machine-specific. */
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/* Use crt1.o as a startup file and crtn.o as a closing file. */
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#define STARTFILE_SPEC \
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"%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
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#ifdef CROSS_COMPILE
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#define LIB_SPEC "-lc crtn.o%s"
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#else
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#define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
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#endif
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/* Special flags for the linker. I don't know what they do. */
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#define LINK_SPEC "%{T*} %{z:-lm}"
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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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#define ASM_OUTPUT_IDENT(FILE, NAME) \
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fprintf (FILE, "\t.ident \"%s\"\n", NAME);
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/* Use periods rather than dollar signs in special g++ assembler names. */
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#define NO_DOLLAR_IN_LABEL
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/* Implicit library calls should use memcpy, not bcopy, etc. */
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#define TARGET_MEM_FUNCTIONS
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/* System V Release 3 uses COFF debugging info. */
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#define SDB_DEBUGGING_INFO
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/* We don't want to output DBX debugging information. */
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#undef DBX_DEBUGGING_INFO
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/* Define the actual types of some ANSI-mandated types. These
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definitions should work for most SVR3 systems. */
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#undef SIZE_TYPE
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#define SIZE_TYPE "unsigned int"
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE "int"
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#undef WCHAR_TYPE
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#define WCHAR_TYPE "long int"
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#undef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE BITS_PER_WORD
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/* Assembler pseudos to introduce constants of various size. These
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definitions should work for most svr3 systems. */
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#undef ASM_BYTE_OP
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#define ASM_BYTE_OP "\t.byte"
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/* The prefix to add to user-visible assembler symbols.
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For System V Release 3 the convention is to prepend a leading
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underscore onto user-level symbol names. */
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#undef USER_LABEL_PREFIX
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#define USER_LABEL_PREFIX "_"
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/* This is how to output an internal numbered label where
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PREFIX is the class of label and NUM is the number within the class.
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For most svr3 systems, the convention is that any symbol which begins
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with a period is not put into the linker symbol table by the assembler. */
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#undef ASM_OUTPUT_INTERNAL_LABEL
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#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
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asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM)
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/* This is how to store into the string LABEL
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the symbol_ref name of an internal numbered label where
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PREFIX is the class of label and NUM is the number within the class.
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This is suitable for output with `assemble_name'.
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For most svr3 systems, the convention is that any symbol which begins
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with a period is not put into the linker symbol table by the assembler. */
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#undef ASM_GENERATE_INTERNAL_LABEL
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#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
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sprintf (LABEL, "*%s%s%d", LOCAL_LABEL_PREFIX, PREFIX, NUM)
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/* We want local labels to start with period if made with asm_fprintf. */
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#undef LOCAL_LABEL_PREFIX
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#define LOCAL_LABEL_PREFIX "."
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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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However, use of the const section is turned off by default
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unless the specific tm.h file turns it on by defining
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USE_CONST_SECTION as 1. */
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/* Define a few machine-specific details of the implementation of
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constructors.
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The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
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and CTOR_LIST_END to contribute to the .init section an instruction to
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push a word containing 0 (or some equivalent of that).
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Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
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#define USE_CONST_SECTION 0
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#define INIT_SECTION_ASM_OP ".section\t.init"
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#define FINI_SECTION_ASM_OP ".section .fini,\"x\""
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#define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\""
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#define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
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#define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
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/* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
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because they push on the stack. */
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#ifndef STACK_GROWS_DOWNWARD
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/* Constructor list on stack is in reverse order. Go to the end of the
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list and go backwards to call constructors in the right order. */
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#define DO_GLOBAL_CTORS_BODY \
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do { \
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func_ptr *p, *beg = alloca (0); \
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for (p = beg; *p; p++) \
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; \
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while (p != beg) \
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(*--p) (); \
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} while (0)
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#else
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/* Constructor list on stack is in correct order. Just call them. */
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#define DO_GLOBAL_CTORS_BODY \
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do { \
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func_ptr *p, *beg = alloca (0); \
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for (p = beg; *p; ) \
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(*p++) (); \
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} while (0)
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#endif /* STACK_GROWS_DOWNWARD */
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/* Add extra sections .rodata, .init and .fini. */
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#undef EXTRA_SECTIONS
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#define EXTRA_SECTIONS in_const, in_init, in_fini
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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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INIT_SECTION_FUNCTION \
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FINI_SECTION_FUNCTION
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#define INIT_SECTION_FUNCTION \
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void \
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init_section () \
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{ \
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if (in_section != in_init) \
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{ \
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fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
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in_section = in_init; \
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} \
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}
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#define FINI_SECTION_FUNCTION \
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void \
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fini_section () \
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{ \
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if (in_section != in_fini) \
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{ \
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fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
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in_section = in_fini; \
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} \
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}
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#define READONLY_DATA_SECTION() const_section ()
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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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extern void text_section(); \
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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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/* The ctors and dtors sections are not normally put into use
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by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
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but it can't hurt to define these macros for whatever systems use them. */
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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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#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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/* This is machine-dependent
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because it needs to push something on the stack. */
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#undef ASM_OUTPUT_CONSTRUCTOR
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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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#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
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do { \
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fini_section (); \
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fprintf (FILE, "%s\t ", ASM_LONG); \
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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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#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 ((0 && RELOC) /* should be (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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#define SELECT_RTX_SECTION(MODE,RTX) const_section()
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