| 1 | /* Definitions for Intel 386 running system V with gnu tools |
| 2 | Copyright (C) 1988 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" |
| 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 | \f |
| 95 | #undef ASM_FILE_START |
| 96 | #define ASM_FILE_START(FILE) \ |
| 97 | fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name); |
| 98 | |
| 99 | /* A C statement or statements which output an assembler instruction |
| 100 | opcode to the stdio stream STREAM. The macro-operand PTR is a |
| 101 | variable of type `char *' which points to the opcode name in its |
| 102 | "internal" form--the form that is written in the machine description. |
| 103 | |
| 104 | GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic. |
| 105 | So use `repe' instead. */ |
| 106 | |
| 107 | #define ASM_OUTPUT_OPCODE(STREAM, PTR) \ |
| 108 | { \ |
| 109 | if ((PTR)[0] == 'r' \ |
| 110 | && (PTR)[1] == 'e' \ |
| 111 | && (PTR)[2] == 'p') \ |
| 112 | { \ |
| 113 | if ((PTR)[3] == 'z') \ |
| 114 | { \ |
| 115 | fprintf (STREAM, "repe"); \ |
| 116 | (PTR) += 4; \ |
| 117 | } \ |
| 118 | else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \ |
| 119 | { \ |
| 120 | fprintf (STREAM, "repne"); \ |
| 121 | (PTR) += 5; \ |
| 122 | } \ |
| 123 | } \ |
| 124 | } |
| 125 | |
| 126 | /* Define macro used to output shift-double opcodes when the shift |
| 127 | count is in %cl. Some assemblers require %cl as an argument; |
| 128 | some don't. |
| 129 | |
| 130 | GAS requires the %cl argument, so override i386/unix.h. */ |
| 131 | |
| 132 | #undef AS3_SHIFT_DOUBLE |
| 133 | #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d) |
| 134 | |
| 135 | /* Print opcodes the way that GAS expects them. */ |
| 136 | #define GAS_MNEMONICS 1 |
| 137 | |
| 138 | #ifdef NO_UNDERSCORES /* If user-symbols don't have underscores, |
| 139 | then it must take more than `L' to identify |
| 140 | a label that should be ignored. */ |
| 141 | |
| 142 | /* This is how to store into the string BUF |
| 143 | the symbol_ref name of an internal numbered label where |
| 144 | PREFIX is the class of label and NUM is the number within the class. |
| 145 | This is suitable for output with `assemble_name'. */ |
| 146 | |
| 147 | #undef ASM_GENERATE_INTERNAL_LABEL |
| 148 | #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \ |
| 149 | sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER)) |
| 150 | |
| 151 | /* This is how to output an internal numbered label where |
| 152 | PREFIX is the class of label and NUM is the number within the class. */ |
| 153 | |
| 154 | #undef ASM_OUTPUT_INTERNAL_LABEL |
| 155 | #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \ |
| 156 | fprintf (FILE, ".%s%d:\n", PREFIX, NUM) |
| 157 | |
| 158 | #endif /* NO_UNDERSCORES */ |