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 seq386gas.h is a GAS configuration that does not use this
24 /* Use the bsd assembler syntax. */
25 /* we need to do this because gas is really a bsd style assembler,
26 * and so doesn't work well this these att-isms:
28 * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
29 * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
30 * used to define bss static space
32 * Next is the question of whether to uses underscores. RMS didn't
33 * like this idea at first, but since it is now obvious that we
34 * need this separate tm file for use with gas, at least to get
35 * dbx debugging info, I think we should also switch to underscores.
36 * We can keep i386v for real att style output, and the few
37 * people who want both form will have to compile twice.
42 /* these come from bsd386.h, but are specific to sequent */
44 #undef DBX_CONTIN_LENGTH
46 /* By default, target has a 80387. */
48 #define TARGET_DEFAULT 1
50 /* Specify predefined symbols in preprocessor. */
52 #define CPP_PREDEFINES "-Dunix -Di386"
54 /* Allow #sccs in preprocessor. */
56 #define SCCS_DIRECTIVE
58 /* Output #ident as a .ident. */
60 #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
62 /* We do not want to output SDB debugging information. */
64 #undef SDB_DEBUGGING_INFO
66 /* We want to output DBX debugging information. */
68 #define DBX_DEBUGGING_INFO
70 /* Implicit library calls should use memcpy, not bcopy, etc. */
72 #define TARGET_MEM_FUNCTIONS
74 #if 0 /* People say gas uses the log as the arg to .align. */
75 /* When using gas, .align N aligns to an N-byte boundary. */
77 #undef ASM_OUTPUT_ALIGN
78 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
79 if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
82 /* Align labels, etc. at 4-byte boundaries.
83 For the 486, align to 16-byte boundary for sake of cache. */
85 #undef ASM_OUTPUT_ALIGN_CODE
86 #define ASM_OUTPUT_ALIGN_CODE(FILE) \
87 fprintf ((FILE), "\t.align %d,0x90\n", \
88 TARGET_486 ? 4 : 2); /* Use log of 16 or log of 4 as arg. */
90 /* Align start of loop at 4-byte boundary. */
92 #undef ASM_OUTPUT_LOOP_ALIGN
93 #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
94 fprintf ((FILE), "\t.align 2,0x90\n"); /* Use log of 4 as arg. */
96 /* Machines that use the AT&T assembler syntax
97 also return floating point values in an FP register. */
98 /* Define how to find the value returned by a function.
99 VALTYPE is the data type of the value (as a tree).
100 If the precise function being called is known, FUNC is its FUNCTION_DECL;
101 otherwise, FUNC is 0. */
103 #define VALUE_REGNO(MODE) \
104 (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
106 /* 1 if N is a possible register number for a function value. */
108 #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
110 #undef ASM_FILE_START
111 #define ASM_FILE_START(FILE) \
112 fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
114 /* A C statement or statements which output an assembler instruction
115 opcode to the stdio stream STREAM. The macro-operand PTR is a
116 variable of type `char *' which points to the opcode name in its
117 "internal" form--the form that is written in the machine description.
119 GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
120 So use `repe' instead. */
122 #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
124 if ((PTR)[0] == 'r' \
126 && (PTR)[2] == 'p') \
128 if ((PTR)[3] == 'z') \
130 fprintf (STREAM, "repe"); \
133 else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
135 fprintf (STREAM, "repne"); \
141 /* Define macro used to output shift-double opcodes when the shift
142 count is in %cl. Some assemblers require %cl as an argument;
145 GAS requires the %cl argument, so override unx386.h. */
147 #undef AS3_SHIFT_DOUBLE
148 #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
150 /* Print opcodes the way that GAS expects them. */
151 #define GAS_MNEMONICS 1