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1.1 root 1: /* Definitions for Intel 386 running system V with gnu tools
2: Copyright (C) 1988, 1993 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: /* Note that i386/seq-gas.h is a GAS configuration that does not use this
21: file. */
22:
23: #include "i386/i386.h"
24:
25: #ifndef YES_UNDERSCORES
26: /* Define this now, because i386/bsd.h tests it. */
27: #define NO_UNDERSCORES
28: #endif
29:
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:
33: *
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
37: *
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.
44: */
45:
46: #include "i386/bsd.h"
47:
48: /* these come from i386/bsd.h, but are specific to sequent */
49: #undef DBX_NO_XREFS
50: #undef DBX_CONTIN_LENGTH
51:
52: /* Ask for COFF symbols. */
53:
54: #define SDB_DEBUGGING_INFO
55:
56: /* Specify predefined symbols in preprocessor. */
57:
58: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Acpu(i386) -Amachine(i386)"
59: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
60:
61: /* Allow #sccs in preprocessor. */
62:
63: #define SCCS_DIRECTIVE
64:
65: /* Output #ident as a .ident. */
66:
67: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
68:
69: /* Implicit library calls should use memcpy, not bcopy, etc. */
70:
71: #define TARGET_MEM_FUNCTIONS
72:
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. */
75:
76: #undef ASM_OUTPUT_ALIGN
77: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
78: if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
79: #endif
80:
81: /* Align labels, etc. at 4-byte boundaries.
82: For the 486, align to 16-byte boundary for sake of cache. */
83:
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. */
88:
89: /* Align start of loop at 4-byte boundary. */
90:
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. */
94:
95: #undef ASM_FILE_START
96: #define ASM_FILE_START(FILE) \
97: do { fprintf (FILE, "\t.file\t"); \
98: output_quoted_string (FILE, dump_base_name); \
99: fprintf (FILE, "\n"); \
100: } while (0)
101:
102: /* A C statement or statements which output an assembler instruction
103: opcode to the stdio stream STREAM. The macro-operand PTR is a
104: variable of type `char *' which points to the opcode name in its
105: "internal" form--the form that is written in the machine description.
106:
107: GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
108: So use `repe' instead. */
109:
110: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
111: { \
112: if ((PTR)[0] == 'r' \
113: && (PTR)[1] == 'e' \
114: && (PTR)[2] == 'p') \
115: { \
116: if ((PTR)[3] == 'z') \
117: { \
118: fprintf (STREAM, "repe"); \
119: (PTR) += 4; \
120: } \
121: else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
122: { \
123: fprintf (STREAM, "repne"); \
124: (PTR) += 5; \
125: } \
126: } \
127: }
128:
129: /* Define macro used to output shift-double opcodes when the shift
130: count is in %cl. Some assemblers require %cl as an argument;
131: some don't.
132:
133: GAS requires the %cl argument, so override i386/unix.h. */
134:
135: #undef AS3_SHIFT_DOUBLE
136: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
137:
138: /* Print opcodes the way that GAS expects them. */
139: #define GAS_MNEMONICS 1
140:
141: #ifdef NO_UNDERSCORES /* If user-symbols don't have underscores,
142: then it must take more than `L' to identify
143: a label that should be ignored. */
144:
145: /* This is how to store into the string BUF
146: the symbol_ref name of an internal numbered label where
147: PREFIX is the class of label and NUM is the number within the class.
148: This is suitable for output with `assemble_name'. */
149:
150: #undef ASM_GENERATE_INTERNAL_LABEL
151: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
152: sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
153:
154: /* This is how to output an internal numbered label where
155: PREFIX is the class of label and NUM is the number within the class. */
156:
157: #undef ASM_OUTPUT_INTERNAL_LABEL
158: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
159: fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
160:
161: #endif /* NO_UNDERSCORES */
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