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1 /* Definitions for Intel 386 using GAS.
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2 Copyright (C) 1988, 1993, 1994, 1996, 2002, 2004, 2007, 2008
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3 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
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22 file. */
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23
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24 /* Use the bsd assembler syntax. */
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25 /* we need to do this because gas is really a bsd style assembler,
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26 * and so doesn't work well this these att-isms:
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27 *
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28 * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
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29 * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
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30 * used to define bss static space
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31 *
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32 * Next is the question of whether to uses underscores. RMS didn't
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33 * like this idea at first, but since it is now obvious that we
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34 * need this separate tm file for use with gas, at least to get
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35 * dbx debugging info, I think we should also switch to underscores.
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36 * We can keep i386v for real att style output, and the few
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37 * people who want both form will have to compile twice.
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38 */
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39
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40 /* these come from i386/bsd.h, but are specific to sequent */
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41 #undef DBX_NO_XREFS
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42 #undef DBX_CONTIN_LENGTH
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43
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44 /* Ask for COFF symbols. */
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45
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46 #define SDB_DEBUGGING_INFO 1
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47
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48 /* Output #ident as a .ident. */
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49
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50 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
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51
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52 /* In the past there was confusion as to what the argument to .align was
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53 in GAS. For the last several years the rule has been this: for a.out
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54 file formats that argument is LOG, and for all other file formats the
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55 argument is 1<<LOG.
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56
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57 However, GAS now has .p2align and .balign pseudo-ops so to remove any
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58 doubt or guess work, and since this file is used for both a.out and other
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59 file formats, we use one of them. */
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60
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61 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN
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62 #undef ASM_OUTPUT_ALIGN
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63 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
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64 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1<<(LOG))
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65 #endif
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66
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67 /* A C statement to output to the stdio stream FILE an assembler
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68 command to advance the location counter to a multiple of 1<<LOG
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69 bytes if it is within MAX_SKIP bytes.
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70
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71 This is used to align code labels according to Intel recommendations. */
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72
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73 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
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74 # define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
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75 if ((LOG) != 0) {\
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76 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
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77 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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78 }
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79 #endif
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80
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81 /* A C statement or statements which output an assembler instruction
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82 opcode to the stdio stream STREAM. The macro-operand PTR is a
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83 variable of type `char *' which points to the opcode name in its
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84 "internal" form--the form that is written in the machine description.
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85
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86 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
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87 So use `repe' instead. */
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88
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89 #undef ASM_OUTPUT_OPCODE
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90 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
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91 { \
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92 if ((PTR)[0] == 'r' \
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93 && (PTR)[1] == 'e' \
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94 && (PTR)[2] == 'p') \
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95 { \
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96 if ((PTR)[3] == 'z') \
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97 { \
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98 fprintf (STREAM, "repe"); \
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99 (PTR) += 4; \
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100 } \
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101 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
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102 { \
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103 fprintf (STREAM, "repne"); \
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104 (PTR) += 5; \
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105 } \
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106 } \
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107 else \
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108 ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR)); \
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109 }
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110
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111 /* Define macro used to output shift-double opcodes when the shift
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112 count is in %cl. Some assemblers require %cl as an argument;
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113 some don't.
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114
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115 GAS requires the %cl argument, so override i386/unix.h. */
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116
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117 #undef SHIFT_DOUBLE_OMITS_COUNT
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118 #define SHIFT_DOUBLE_OMITS_COUNT 0
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119
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120 /* Print opcodes the way that GAS expects them. */
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121 #define GAS_MNEMONICS 1
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122
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123 /* The comment-starter string as GAS expects it. */
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124 #undef ASM_COMMENT_START
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125 #define ASM_COMMENT_START "#"
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126
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127 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
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