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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:
1.1.1.2 root 20: /* Note that seq386gas.h is a GAS configuration that does not use this
21: file. */
1.1 root 22:
23: #include "i386.h"
1.1.1.3 ! root 24:
! 25: #ifndef YES_UNDERSCORES
! 26: /* Define this now, because bsd386.h tests it. */
! 27: #define NO_UNDERSCORES
! 28: #endif
! 29:
1.1 root 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 "bsd386.h"
47:
48: /* these come from bsd386.h, but are specific to sequent */
49: #undef DBX_NO_XREFS
50: #undef DBX_CONTIN_LENGTH
51:
1.1.1.3 ! root 52: /* Ask for COFF symbols. */
1.1 root 53:
1.1.1.3 ! root 54: #define SDB_DEBUGGING_INFO
1.1 root 55:
56: /* Specify predefined symbols in preprocessor. */
57:
58: #define CPP_PREDEFINES "-Dunix -Di386"
1.1.1.3 ! root 59: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
1.1 root 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: fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
98:
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.
103:
104: GAS version 1.38.1 doesn't understand the `repz' opcode mnemonic.
105: So use `repe' instead. */
106:
107: #define ASM_OUTPUT_OPCODE(STREAM, PTR) \
108: { \
109: if ((PTR)[0] == 'r' \
110: && (PTR)[1] == 'e' \
1.1.1.2 root 111: && (PTR)[2] == 'p') \
1.1 root 112: { \
1.1.1.2 root 113: if ((PTR)[3] == 'z') \
114: { \
115: fprintf (STREAM, "repe"); \
116: (PTR) += 4; \
117: } \
118: else if ((PTR)[3] == 'n' && (PTR)[4] == 'z') \
119: { \
120: fprintf (STREAM, "repne"); \
121: (PTR) += 5; \
122: } \
1.1 root 123: } \
124: }
1.1.1.2 root 125:
126: /* Define macro used to output shift-double opcodes when the shift
127: count is in %cl. Some assemblers require %cl as an argument;
128: some don't.
129:
130: GAS requires the %cl argument, so override unx386.h. */
131:
132: #undef AS3_SHIFT_DOUBLE
133: #define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d)
134:
135: /* Print opcodes the way that GAS expects them. */
136: #define GAS_MNEMONICS 1
1.1.1.3 ! root 137:
! 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. */
! 141:
! 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'. */
! 146:
! 147: #undef ASM_GENERATE_INTERNAL_LABEL
! 148: #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
! 149: sprintf ((BUF), ".%s%d", (PREFIX), (NUMBER))
! 150:
! 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. */
! 153:
! 154: #undef ASM_OUTPUT_INTERNAL_LABEL
! 155: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
! 156: fprintf (FILE, ".%s%d:\n", PREFIX, NUM)
! 157:
! 158: #endif /* NO_UNDERSCORES */
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