1 /* Definitions for Intel 386 using GAS. 2 Copyright (C) 1988-2021 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC 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 3, or (at your option) 9 any later version. 10 11 GCC 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 GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* Note that i386/seq-gas.h is a GAS configuration that does not use this 21 file. */ 22 23 /* Use the bsd assembler syntax. */ 24 /* we need to do this because gas is really a bsd style assembler, 25 * and so doesn't work well this these att-isms: 26 * 27 * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas 28 * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be 29 * used to define bss static space 30 * 31 * Next is the question of whether to uses underscores. RMS didn't 32 * like this idea at first, but since it is now obvious that we 33 * need this separate tm file for use with gas, at least to get 34 * dbx debugging info, I think we should also switch to underscores. 35 * We can keep i386v for real att style output, and the few 36 * people who want both form will have to compile twice. 37 */ 38 39 /* these come from i386/bsd.h, but are specific to sequent */ 40 #undef DBX_NO_XREFS 41 #undef DBX_CONTIN_LENGTH 42 43 /* Output #ident as a .ident. */ 44 45 #undef TARGET_ASM_OUTPUT_IDENT 46 #define TARGET_ASM_OUTPUT_IDENT default_asm_output_ident_directive 47 48 /* In the past there was confusion as to what the argument to .align was 49 in GAS. For the last several years the rule has been this: for a.out 50 file formats that argument is LOG, and for all other file formats the 51 argument is 1<<LOG. 52 53 However, GAS now has .p2align and .balign pseudo-ops so to remove any 54 doubt or guess work, and since this file is used for both a.out and other 55 file formats, we use one of them. */ 56 57 #ifdef HAVE_GAS_BALIGN_AND_P2ALIGN 58 #undef ASM_OUTPUT_ALIGN 59 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 60 if ((LOG)!=0) fprintf ((FILE), "\t.balign %d\n", 1 << (LOG)) 61 #endif 62 63 /* A C statement to output to the stdio stream FILE an assembler 64 command to advance the location counter to a multiple of 1<<LOG 65 bytes if it is within MAX_SKIP bytes. 66 67 This is used to align code labels according to Intel recommendations. */ 68 69 #ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 70 # define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \ 71 if ((LOG) != 0) { \ 72 if ((MAX_SKIP) == 0 || (MAX_SKIP) >= (1 << (LOG)) - 1) \ 73 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 74 else \ 75 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 76 } 77 #endif 78 79 /* A C statement or statements which output an assembler instruction 80 opcode to the stdio stream STREAM. The macro-operand PTR is a 81 variable of type `char *' which points to the opcode name in its 82 "internal" form--the form that is written in the machine description. 83 84 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic. 85 So use `repe' instead. */ 86 87 #undef ASM_OUTPUT_OPCODE 88 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \ 89 { \ 90 if ((PTR)[0] == 'r' \ 91 && (PTR)[1] == 'e' \ 92 && (PTR)[2] == 'p') \ 93 { \ 94 if ((PTR)[3] == 'z') \ 95 { \ 96 fputs ("repe", (STREAM)); \ 97 (PTR) += 4; \ 98 } \ 99 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \ 100 { \ 101 fputs ("repne", (STREAM)); \ 102 (PTR) += 5; \ 103 } \ 104 } \ 105 else \ 106 ASM_OUTPUT_AVX_PREFIX ((STREAM), (PTR)); \ 107 } 108 109 /* Define macro used to output shift-double opcodes when the shift 110 count is in %cl. Some assemblers require %cl as an argument; 111 some don't. 112 113 GAS requires the %cl argument, so override i386/unix.h. */ 114 115 #undef SHIFT_DOUBLE_OMITS_COUNT 116 #define SHIFT_DOUBLE_OMITS_COUNT 0 117 118 /* The comment-starter string as GAS expects it. */ 119 #undef ASM_COMMENT_START 120 #define ASM_COMMENT_START "#" 121 122 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true 123