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Annotation of GNUtools/cc/config/i386/gas.h, revision 1.1

1.1     ! root        1: /* Definitions for Intel 386 running system V with gnu tools
        !             2:    Copyright (C) 1988, 1993 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: /* Note that i386/seq-gas.h is a GAS configuration that does not use this
        !            21:    file. */
        !            22: 
        !            23: #include "i386/i386.h"
        !            24: 
        !            25: #ifndef YES_UNDERSCORES
        !            26: /* Define this now, because i386/bsd.h tests it.  */
        !            27: #define NO_UNDERSCORES
        !            28: #endif
        !            29: 
        !            30: /* Use the bsd assembler syntax.  */
        !            31: /* we need to do this because gas is really a bsd style assembler,
        !            32:  * and so doesn't work well this these att-isms:
        !            33:  *
        !            34:  *  ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
        !            35:  *  ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
        !            36:  *   used to define bss static space
        !            37:  *
        !            38:  * Next is the question of whether to uses underscores.  RMS didn't
        !            39:  * like this idea at first, but since it is now obvious that we
        !            40:  * need this separate tm file for use with gas, at least to get
        !            41:  * dbx debugging info, I think we should also switch to underscores.
        !            42:  * We can keep i386v for real att style output, and the few
        !            43:  * people who want both form will have to compile twice.
        !            44:  */
        !            45: 
        !            46: #include "i386/bsd.h"
        !            47: 
        !            48: /* these come from i386/bsd.h, but are specific to sequent */
        !            49: #undef DBX_NO_XREFS
        !            50: #undef DBX_CONTIN_LENGTH
        !            51: 
        !            52: /* Ask for COFF symbols.  */
        !            53: 
        !            54: #define SDB_DEBUGGING_INFO
        !            55: 
        !            56: /* Specify predefined symbols in preprocessor.  */
        !            57: 
        !            58: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Acpu(i386) -Amachine(i386)"
        !            59: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
        !            60: 
        !            61: /* Allow #sccs in preprocessor.  */
        !            62: 
        !            63: #define SCCS_DIRECTIVE
        !            64: 
        !            65: /* Output #ident as a .ident.  */
        !            66: 
        !            67: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
        !            68: 
        !            69: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !            70: 
        !            71: #define TARGET_MEM_FUNCTIONS
        !            72: 
        !            73: #if 0  /* People say gas uses the log as the arg to .align.  */
        !            74: /* When using gas, .align N aligns to an N-byte boundary.  */
        !            75: 
        !            76: #undef ASM_OUTPUT_ALIGN
        !            77: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
        !            78:      if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
        !            79: #endif
        !            80: 
        !            81: /* Align labels, etc. at 4-byte boundaries.
        !            82:    For the 486, align to 16-byte boundary for sake of cache.  */
        !            83: 
        !            84: #undef ASM_OUTPUT_ALIGN_CODE
        !            85: #define ASM_OUTPUT_ALIGN_CODE(FILE)                    \
        !            86:      fprintf ((FILE), "\t.align %d,0x90\n",            \
        !            87:              TARGET_486 ? 4 : 2);  /* Use log of 16 or log of 4 as arg.  */
        !            88: 
        !            89: /* Align start of loop at 4-byte boundary.  */
        !            90: 
        !            91: #undef ASM_OUTPUT_LOOP_ALIGN
        !            92: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
        !            93:      fprintf ((FILE), "\t.align 2,0x90\n");  /* Use log of 4 as arg.  */
        !            94: 
        !            95: #undef ASM_FILE_START
        !            96: #define ASM_FILE_START(FILE) \
        !            97:   do { fprintf (FILE, "\t.file\t");                    \
        !            98:        output_quoted_string (FILE, dump_base_name);    \
        !            99:        fprintf (FILE, "\n");                           \
        !           100:   } while (0)
        !           101: 
        !           102: /* A C statement or statements which output an assembler instruction
        !           103:    opcode to the stdio stream STREAM.  The macro-operand PTR is a
        !           104:    variable of type `char *' which points to the opcode name in its
        !           105:    "internal" form--the form that is written in the machine description.
        !           106: 
        !           107:    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
        !           108:    So use `repe' instead.  */
        !           109: 
        !           110: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
        !           111: {                                                                      \
        !           112:   if ((PTR)[0] == 'r'                                                  \
        !           113:       && (PTR)[1] == 'e'                                               \
        !           114:       && (PTR)[2] == 'p')                                              \
        !           115:     {                                                                  \
        !           116:       if ((PTR)[3] == 'z')                                             \
        !           117:        {                                                               \
        !           118:          fprintf (STREAM, "repe");                                     \
        !           119:          (PTR) += 4;                                                   \
        !           120:        }                                                               \
        !           121:       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')                     \
        !           122:        {                                                               \
        !           123:          fprintf (STREAM, "repne");                                    \
        !           124:          (PTR) += 5;                                                   \
        !           125:        }                                                               \
        !           126:     }                                                                  \
        !           127: }
        !           128: 
        !           129: /* Define macro used to output shift-double opcodes when the shift
        !           130:    count is in %cl.  Some assemblers require %cl as an argument;
        !           131:    some don't.
        !           132: 
        !           133:    GAS requires the %cl argument, so override i386/unix.h. */
        !           134: 
        !           135: #undef AS3_SHIFT_DOUBLE
        !           136: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
        !           137: 
        !           138: /* Print opcodes the way that GAS expects them. */
        !           139: #define GAS_MNEMONICS 1
        !           140: 
        !           141: #ifdef NO_UNDERSCORES /* If user-symbols don't have underscores,
        !           142:                         then it must take more than `L' to identify
        !           143:                         a label that should be ignored.  */
        !           144: 
        !           145: /* This is how to store into the string BUF
        !           146:    the symbol_ref name of an internal numbered label where
        !           147:    PREFIX is the class of label and NUM is the number within the class.
        !           148:    This is suitable for output with `assemble_name'.  */
        !           149: 
        !           150: #undef ASM_GENERATE_INTERNAL_LABEL
        !           151: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
        !           152:     sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
        !           153: 
        !           154: /* This is how to output an internal numbered label where
        !           155:    PREFIX is the class of label and NUM is the number within the class.  */
        !           156: 
        !           157: #undef ASM_OUTPUT_INTERNAL_LABEL
        !           158: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !           159:   fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
        !           160: 
        !           161: #endif /* NO_UNDERSCORES */

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