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1.1 root 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:
21: #include "i386.h"
22: /* Use the bsd assembler syntax. */
23: /* we need to do this because gas is really a bsd style assembler,
24: * and so doesn't work well this these att-isms:
25: *
26: * ASM_OUTPUT_SKIP is .set .,.+N, which isn't implemented in gas
27: * ASM_OUTPUT_LOCAL is done with .set .,.+N, but that can't be
28: * used to define bss static space
29: *
30: * Next is the question of whether to uses underscores. RMS didn't
31: * like this idea at first, but since it is now obvious that we
32: * need this separate tm file for use with gas, at least to get
33: * dbx debugging info, I think we should also switch to underscores.
34: * We can keep i386v for real att style output, and the few
35: * people who want both form will have to compile twice.
36: */
37:
38: #include "bsd386.h"
39:
40: /* these come from bsd386.h, but are specific to sequent */
41: #undef DBX_NO_XREFS
42: #undef DBX_CONTIN_LENGTH
43:
44: /* By default, target has a 80387. */
45:
46: #define TARGET_DEFAULT 1
47:
48: /* Specify predefined symbols in preprocessor. */
49:
50: #define CPP_PREDEFINES "-Dunix -Di386"
51:
52: /* Allow #sccs in preprocessor. */
53:
54: #define SCCS_DIRECTIVE
55:
56: /* Output #ident as a .ident. */
57:
58: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
59:
60: /* We do not want to output SDB debugging information. */
61:
62: #undef SDB_DEBUGGING_INFO
63:
64: /* We want to output DBX debugging information. */
65:
66: #define DBX_DEBUGGING_INFO
67:
68: /* Implicit library calls should use memcpy, not bcopy, etc. */
69:
70: #define TARGET_MEM_FUNCTIONS
71:
72: #if 0 /* People say gas uses the log as the arg to .align. */
73: /* When using gas, .align N aligns to an N-byte boundary. */
74:
75: #undef ASM_OUTPUT_ALIGN
76: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
77: if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
78: #endif
79:
80: /* Align labels, etc. at 4-byte boundaries.
81: For the 486, align to 16-byte boundary for sake of cache. */
82:
83: #undef ASM_OUTPUT_ALIGN_CODE
84: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
85: fprintf ((FILE), "\t.align %d,0x90\n", \
86: TARGET_486 ? 4 : 2); /* Use log of 16 or log of 4 as arg. */
87:
88: /* Align start of loop at 4-byte boundary. */
89:
90: #undef ASM_OUTPUT_LOOP_ALIGN
91: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
92: fprintf ((FILE), "\t.align 2,0x90\n"); /* Use log of 4 as arg. */
93:
94: /* Machines that use the AT&T assembler syntax
95: also return floating point values in an FP register. */
96: /* Define how to find the value returned by a function.
97: VALTYPE is the data type of the value (as a tree).
98: If the precise function being called is known, FUNC is its FUNCTION_DECL;
99: otherwise, FUNC is 0. */
100:
101: #define VALUE_REGNO(MODE) \
102: (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
103:
104: /* 1 if N is a possible register number for a function value. */
105:
106: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
107:
108: #undef ASM_FILE_START
109: #define ASM_FILE_START(FILE) \
110: fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
111:
112: /* A C statement or statements which output an assembler instruction
113: opcode to the stdio stream STREAM. The macro-operand PTR is a
114: variable of type `char *' which points to the opcode name in its
115: "internal" form--the form that is written in the machine description.
116:
117: GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
118: So use `repe' instead. */
119:
120: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
121: { \
122: if ((PTR)[0] == 'r' \
123: && (PTR)[1] == 'e' \
124: && (PTR)[2] == 'p' \
125: && (PTR)[3] == 'z') \
126: { \
127: fprintf (STREAM, "repe"); \
128: (PTR) += 4; \
129: } \
130: }
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