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Annotation of gcc/config/i386/gas.h, revision 1.1.1.2

1.1       root        1: /* Definitions for Intel 386 running system V with gnu tools
1.1.1.2 ! root        2:    Copyright (C) 1988, 1993, 1994 Free Software Foundation, Inc.
1.1       root        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: 
1.1.1.2 ! root       58: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Acpu(i386) -Amachine(i386)"
1.1       root       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: /* A C statement or statements which output an assembler instruction
                     96:    opcode to the stdio stream STREAM.  The macro-operand PTR is a
                     97:    variable of type `char *' which points to the opcode name in its
                     98:    "internal" form--the form that is written in the machine description.
                     99: 
                    100:    GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
                    101:    So use `repe' instead.  */
                    102: 
                    103: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
                    104: {                                                                      \
                    105:   if ((PTR)[0] == 'r'                                                  \
                    106:       && (PTR)[1] == 'e'                                               \
                    107:       && (PTR)[2] == 'p')                                              \
                    108:     {                                                                  \
                    109:       if ((PTR)[3] == 'z')                                             \
                    110:        {                                                               \
                    111:          fprintf (STREAM, "repe");                                     \
                    112:          (PTR) += 4;                                                   \
                    113:        }                                                               \
                    114:       else if ((PTR)[3] == 'n' && (PTR)[4] == 'z')                     \
                    115:        {                                                               \
                    116:          fprintf (STREAM, "repne");                                    \
                    117:          (PTR) += 5;                                                   \
                    118:        }                                                               \
                    119:     }                                                                  \
                    120: }
                    121: 
                    122: /* Define macro used to output shift-double opcodes when the shift
                    123:    count is in %cl.  Some assemblers require %cl as an argument;
                    124:    some don't.
                    125: 
                    126:    GAS requires the %cl argument, so override i386/unix.h. */
                    127: 
                    128: #undef AS3_SHIFT_DOUBLE
                    129: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
                    130: 
                    131: /* Print opcodes the way that GAS expects them. */
                    132: #define GAS_MNEMONICS 1
                    133: 
                    134: #ifdef NO_UNDERSCORES /* If user-symbols don't have underscores,
                    135:                         then it must take more than `L' to identify
                    136:                         a label that should be ignored.  */
                    137: 
                    138: /* This is how to store into the string BUF
                    139:    the symbol_ref name of an internal numbered label where
                    140:    PREFIX is the class of label and NUM is the number within the class.
                    141:    This is suitable for output with `assemble_name'.  */
                    142: 
                    143: #undef ASM_GENERATE_INTERNAL_LABEL
                    144: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
                    145:     sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
                    146: 
                    147: /* This is how to output an internal numbered label where
                    148:    PREFIX is the class of label and NUM is the number within the class.  */
                    149: 
                    150: #undef ASM_OUTPUT_INTERNAL_LABEL
                    151: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
                    152:   fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
                    153: 
                    154: #endif /* NO_UNDERSCORES */

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