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gcc.gnu.org Git - gcc.git/blob - gcc/config/i386/gas.h
1 /* Definitions for Intel 386 running system V with gnu tools
2 Copyright (C) 1988 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
20 /* Note that i386/seq-gas.h is a GAS configuration that does not use this
25 #ifndef YES_UNDERSCORES
26 /* Define this now, because i386/bsd.h tests it. */
27 #define NO_UNDERSCORES
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:
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
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.
48 /* these come from i386/bsd.h, but are specific to sequent */
50 #undef DBX_CONTIN_LENGTH
52 /* Ask for COFF symbols. */
54 #define SDB_DEBUGGING_INFO
56 /* Specify predefined symbols in preprocessor. */
58 #define CPP_PREDEFINES "-Dunix -Di386"
59 #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
61 /* Allow #sccs in preprocessor. */
63 #define SCCS_DIRECTIVE
65 /* Output #ident as a .ident. */
67 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
69 /* Implicit library calls should use memcpy, not bcopy, etc. */
71 #define TARGET_MEM_FUNCTIONS
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. */
76 #undef ASM_OUTPUT_ALIGN
77 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
78 if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
81 /* Align labels, etc. at 4-byte boundaries.
82 For the 486, align to 16-byte boundary for sake of cache. */
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. */
89 /* Align start of loop at 4-byte boundary. */
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. */
96 #define ASM_FILE_START(FILE) \
97 fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
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.
104 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
105 So use `repe' instead. */
107 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
109 if ((PTR)[0] == 'r' \
111 && (PTR)[2] == 'p') \
113 if ((PTR)[3] == 'z') \
115 fprintf (STREAM, "repe"); \
118 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
120 fprintf (STREAM, "repne"); \
126 /* Define macro used to output shift-double opcodes when the shift
127 count is in %cl. Some assemblers require %cl as an argument;
130 GAS requires the %cl argument, so override i386/unix.h. */
132 #undef AS3_SHIFT_DOUBLE
133 #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
135 /* Print opcodes the way that GAS expects them. */
136 #define GAS_MNEMONICS 1
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. */
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'. */
147 #undef ASM_GENERATE_INTERNAL_LABEL
148 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
149 sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
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. */
154 #undef ASM_OUTPUT_INTERNAL_LABEL
155 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
156 fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
158 #endif /* NO_UNDERSCORES */
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