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Annotation of gcc/config/svr3.h, revision 1.1

1.1     ! root        1: /* svr3.h  --  operating system specific defines to be used when
        !             2:    targeting GCC for some generic System V Release 3 system.
        !             3:    Copyright (C) 1991 Free Software Foundation, Inc.
        !             4: 
        !             5:    Written by Ron Guilmette ([email protected]).
        !             6: 
        !             7: This file is part of GNU CC.
        !             8: 
        !             9: GNU CC is free software; you can redistribute it and/or modify
        !            10: it under the terms of the GNU General Public License as published by
        !            11: the Free Software Foundation; either version 2, or (at your option)
        !            12: any later version.
        !            13: 
        !            14: GNU CC is distributed in the hope that it will be useful,
        !            15: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            16: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            17: GNU General Public License for more details.
        !            18: 
        !            19: You should have received a copy of the GNU General Public License
        !            20: along with GNU CC; see the file COPYING.  If not, write to
        !            21: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            22: 
        !            23:    To use this file, make up a file with a name like:
        !            24: 
        !            25:        ?????svr3.h
        !            26: 
        !            27:    where ????? is replaced by the name of the basic hardware that you
        !            28:    are targeting for.  Then, in the file ?????svr3.h, put something
        !            29:    like:
        !            30: 
        !            31:        #include "?????.h"
        !            32:        #include "svr3.h"
        !            33: 
        !            34:    followed by any really system-specific defines (or overrides of
        !            35:    defines) which you find that you need.  For example, CPP_PREDEFINES
        !            36:    is defined here with only the defined -Dunix and -DSVR3.  You should
        !            37:    probably override that in your target-specific ?????svr3.h file
        !            38:    with a set of defines that includes these, but also contains an
        !            39:    appropriate define for the type of hardware that you are targeting.
        !            40: */
        !            41: 
        !            42: /* Define a symbol so that libgcc* can know what sort of operating
        !            43:    environment and assembler syntax we are targeting for.  */
        !            44: #define SVR3_target
        !            45: 
        !            46: /* Cpp, assembler, linker, library, and startfile spec's.  */
        !            47: 
        !            48: /* You should redefine CPP_PREDEFINES in any file which includes this one.
        !            49:    The definition should be appropriate for the type of target system
        !            50:    involved, and it should include any -A (assertion) options which are
        !            51:    appropriate for the given target system.  */
        !            52: 
        !            53: #undef CPP_PREDEFINES
        !            54: 
        !            55: /* Output at beginning of assembler file.  */
        !            56: /* The .file command should always begin the output.  */
        !            57: 
        !            58: #undef ASM_FILE_START
        !            59: #define ASM_FILE_START(FILE)                                   \
        !            60:   do { output_file_directive ((FILE), main_input_filename);    \
        !            61:        if (optimize) ASM_FILE_START_1 (FILE);                  \
        !            62:      } while (0)
        !            63: 
        !            64: /* By default, do nothing: a few machines support .optim, but not most.  */
        !            65: #undef ASM_FILE_START_1
        !            66: #define ASM_FILE_START_1(FILE)
        !            67: 
        !            68: /* This says how to output an assembler line
        !            69:    to define a global common symbol.  */
        !            70: /* We don't use ROUNDED because the standard compiler doesn't,
        !            71:    and the linker gives error messages if a common symbol
        !            72:    has more than one length value.  */
        !            73: 
        !            74: #undef ASM_OUTPUT_COMMON
        !            75: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
        !            76: ( fputs (".comm ", (FILE)),                    \
        !            77:   assemble_name ((FILE), (NAME)),              \
        !            78:   fprintf ((FILE), ",%u\n", (SIZE)))
        !            79: 
        !            80: /* This says how to output an assembler line
        !            81:    to define a local common symbol.  */
        !            82: 
        !            83: /* Note that using bss_section here caused errors
        !            84:    in building shared libraries on system V.3.  */
        !            85: #undef ASM_OUTPUT_LOCAL
        !            86: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)    \
        !            87:   do {                                                 \
        !            88:     int align = exact_log2 (ROUNDED);                  \
        !            89:     if (align > 2) align = 2;                          \
        !            90:     data_section ();                                   \
        !            91:     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align);        \
        !            92:     ASM_OUTPUT_LABEL ((FILE), (NAME));                 \
        !            93:     fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED));    \
        !            94:   } while (0)
        !            95: 
        !            96: #if 0 /* For now, let's leave these machine-specific.  */
        !            97: /* Use crt1.o as a startup file and crtn.o as a closing file.  */
        !            98: 
        !            99: #define STARTFILE_SPEC  \
        !           100:   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
        !           101: 
        !           102: #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
        !           103: 
        !           104: /* Special flags for the linker.  I don't know what they do.  */
        !           105: 
        !           106: #define LINK_SPEC "%{T*} %{z:-lm}"
        !           107: #endif
        !           108: 
        !           109: /* Allow #sccs in preprocessor.  */
        !           110: 
        !           111: #define SCCS_DIRECTIVE
        !           112: 
        !           113: /* Output #ident as a .ident.  */
        !           114: 
        !           115: #define ASM_OUTPUT_IDENT(FILE, NAME) \
        !           116:   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
        !           117: 
        !           118: /* Use periods rather than dollar signs in special g++ assembler names.  */
        !           119: 
        !           120: #define NO_DOLLAR_IN_LABEL
        !           121: 
        !           122: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !           123: 
        !           124: #define TARGET_MEM_FUNCTIONS
        !           125: 
        !           126: /* System V Release 3 uses COFF debugging info.  */
        !           127: 
        !           128: #define SDB_DEBUGGING_INFO
        !           129: 
        !           130: /* We don't want to output DBX debugging information.  */
        !           131: 
        !           132: #undef DBX_DEBUGGING_INFO
        !           133: 
        !           134: /* Define the actual types of some ANSI-mandated types.  These
        !           135:    definitions should work for most SVR3 systems.  */
        !           136: 
        !           137: #undef SIZE_TYPE
        !           138: #define SIZE_TYPE "unsigned int"
        !           139: 
        !           140: #undef PTRDIFF_TYPE
        !           141: #define PTRDIFF_TYPE "int"
        !           142: 
        !           143: #undef WCHAR_TYPE
        !           144: #define WCHAR_TYPE "long int"
        !           145: 
        !           146: #undef WCHAR_TYPE_SIZE
        !           147: #define WCHAR_TYPE_SIZE BITS_PER_WORD
        !           148: 
        !           149: /* Assembler pseudos to introduce constants of various size.  These
        !           150:    definitions hsould work for most svr3 systems.  */
        !           151: 
        !           152: #undef ASM_BYTE_OP
        !           153: #define ASM_BYTE_OP "\t.byte"
        !           154: 
        !           155: /* This is how to output a reference to a user-level label named NAME.
        !           156:    `assemble_name' uses this.
        !           157: 
        !           158:    For System V Release 3 the convention is to prepend a leading
        !           159:    underscore onto user-level symbol names.  */
        !           160: 
        !           161: #undef ASM_OUTPUT_LABELREF
        !           162: #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME)
        !           163: 
        !           164: /* Support const sections and the ctors and dtors sections for g++.
        !           165:    Note that there appears to be two different ways to support const
        !           166:    sections at the moment.  You can either #define the symbol
        !           167:    READONLY_DATA_SECTION (giving it some code which switches to the
        !           168:    readonly data section) or else you can #define the symbols
        !           169:    EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
        !           170:    SELECT_RTX_SECTION.  We do both here just to be on the safe side.
        !           171:    However, use of the const section is turned off by default
        !           172:    unless the specific tm.h file turns it on by defining
        !           173:    USE_CONST_SECTION as 1.  */
        !           174: 
        !           175: /* The support for constructors and destructors depends on two
        !           176:    machine-specific macros that the individual tm.h file has to define:
        !           177: 
        !           178:    CTORS_SECTION_ASM_OP should be defined to concatenate
        !           179:    the macro INIT_SECTION_ASM_OP, a newline, and a push instruction
        !           180:    to push a word containing 0 (or some equivalent of that).
        !           181: 
        !           182:    ASM_OUTPUT_CONSTRUCTOR should be defined
        !           183:    to push the address of the constructor.  */
        !           184: 
        !           185: #define USE_CONST_SECTION      0
        !           186: 
        !           187: #define INIT_SECTION_ASM_OP     "\t.section\t.init"
        !           188: #define FINI_SECTION_ASM_OP     ".section .fini,\"x\""
        !           189: #define CONST_SECTION_ASM_OP   "\t.section\t.rodata, \"x\""
        !           190: 
        !           191: #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
        !           192: /* CTORS_SECTION_ASM_OP is machine-dependent
        !           193:    because it pushes on the stack.  */
        !           194: 
        !           195: #define DO_GLOBAL_CTORS_BODY                                           \
        !           196: do {                                                                   \
        !           197:   func_ptr *__CTOR_LIST__ = __builtin_alloca (0), *p;                  \
        !           198:   for (p = __CTOR_LIST__; *p; )                                                \
        !           199:     (*p++) ();                                                         \
        !           200: } while (0)
        !           201: 
        !           202: /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
        !           203: 
        !           204: #undef EXTRA_SECTIONS
        !           205: #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
        !           206: 
        !           207: #undef EXTRA_SECTION_FUNCTIONS
        !           208: #define EXTRA_SECTION_FUNCTIONS                                        \
        !           209:   CONST_SECTION_FUNCTION                                       \
        !           210:   BSS_SECTION_FUNCTION                                         \
        !           211:   INIT_SECTION_FUNCTION                                                \
        !           212:   FINI_SECTION_FUNCTION
        !           213: 
        !           214: #define INIT_SECTION_FUNCTION                                  \
        !           215: void                                                           \
        !           216: init_section ()                                                \
        !           217: {                                                              \
        !           218:   if (in_section != in_init)                                   \
        !           219:     {                                                          \
        !           220:       fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP);   \
        !           221:       in_section = in_init;                                    \
        !           222:     }                                                          \
        !           223: }
        !           224: 
        !           225: #define FINI_SECTION_FUNCTION                                  \
        !           226: void                                                           \
        !           227: fini_section ()                                                        \
        !           228: {                                                              \
        !           229:   if (in_section != in_fini)                                   \
        !           230:     {                                                          \
        !           231:       fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP);   \
        !           232:       in_section = in_fini;                                    \
        !           233:     }                                                          \
        !           234: }
        !           235: 
        !           236: #define READONLY_DATA_SECTION() const_section ()
        !           237: 
        !           238: #define CONST_SECTION_FUNCTION                                         \
        !           239: void                                                                   \
        !           240: const_section ()                                                       \
        !           241: {                                                                      \
        !           242:   extern void text_section();                                          \
        !           243:   if (!USE_CONST_SECTION)                                              \
        !           244:     text_section();                                                    \
        !           245:   else if (in_section != in_const)                                     \
        !           246:     {                                                                  \
        !           247:       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);            \
        !           248:       in_section = in_const;                                           \
        !           249:     }                                                                  \
        !           250: }
        !           251: 
        !           252: #if 0
        !           253: #define CTORS_SECTION_FUNCTION                                         \
        !           254: void                                                                   \
        !           255: ctors_section ()                                                       \
        !           256: {                                                                      \
        !           257:   if (in_section != in_ctors)                                          \
        !           258:     {                                                                  \
        !           259:       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);            \
        !           260:       in_section = in_ctors;                                           \
        !           261:     }                                                                  \
        !           262: }
        !           263: 
        !           264: #define DTORS_SECTION_FUNCTION                                         \
        !           265: void                                                                   \
        !           266: dtors_section ()                                                       \
        !           267: {                                                                      \
        !           268:   if (in_section != in_dtors)                                          \
        !           269:     {                                                                  \
        !           270:       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);            \
        !           271:       in_section = in_dtors;                                           \
        !           272:     }                                                                  \
        !           273: }
        !           274: #endif
        !           275: 
        !           276: /* This is machine-dependent
        !           277:    because it needs to push something on the stack.  */
        !           278: #undef ASM_OUTPUT_CONSTRUCTOR
        !           279: 
        !           280: /* A C statement (sans semicolon) to output an element in the table of
        !           281:    global destructors.  */
        !           282: #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)                                       \
        !           283:   do {                                                                 \
        !           284:     fini_section ();                                                   \
        !           285:     fprintf (FILE, "%s\t ", ASM_LONG);                                 \
        !           286:     assemble_name (FILE, NAME);                                        \
        !           287:     fprintf (FILE, "\n");                                              \
        !           288:   } while (0)
        !           289: 
        !           290: /* A C statement or statements to switch to the appropriate
        !           291:    section for output of DECL.  DECL is either a `VAR_DECL' node
        !           292:    or a constant of some sort.  RELOC indicates whether forming
        !           293:    the initial value of DECL requires link-time relocations.  */
        !           294: 
        !           295: #define SELECT_SECTION(DECL,RELOC)                                     \
        !           296: {                                                                      \
        !           297:   if (TREE_CODE (DECL) == STRING_CST)                                  \
        !           298:     {                                                                  \
        !           299:       if (! flag_writable_strings)                                     \
        !           300:        const_section ();                                               \
        !           301:       else                                                             \
        !           302:        data_section ();                                                \
        !           303:     }                                                                  \
        !           304:   else if (TREE_CODE (DECL) == VAR_DECL)                               \
        !           305:     {                                                                  \
        !           306:       if ((0 && RELOC) /* should be (flag_pic && RELOC) */             \
        !           307:          || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL))         \
        !           308:        data_section ();                                                \
        !           309:       else                                                             \
        !           310:        const_section ();                                               \
        !           311:     }                                                                  \
        !           312:   else                                                                 \
        !           313:     const_section ();                                                  \
        !           314: }
        !           315: 
        !           316: /* A C statement or statements to switch to the appropriate
        !           317:    section for output of RTX in mode MODE.  RTX is some kind
        !           318:    of constant in RTL.  The argument MODE is redundant except
        !           319:    in the case of a `const_int' rtx.  Currently, these always
        !           320:    go into the const section.  */
        !           321: 
        !           322: #define SELECT_RTX_SECTION(MODE,RTX) const_section()

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