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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 1, 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 "tm-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. */
34:
35: #include "tm-bsd386.h"
36:
37: /* these come from tm-bsd386.h, but are specific to sequent */
38: #undef DBX_NO_XREFS
39: #undef DBX_CONTIN_LENGTH
40:
41: /* By default, target has a 80387. */
42:
43: #define TARGET_DEFAULT 1
44:
45: /* Use crt1.o as a startup file and crtn.o as a closing file. */
46:
47: #define STARTFILE_SPEC \
48: "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
49:
50: #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
51:
52: /* Specify predefined symbols in preprocessor. */
53:
54: #define CPP_PREDEFINES "-Dunix -Di386"
55:
56: /* Allow #sccs in preprocessor. */
57:
58: #define SCCS_DIRECTIVE
59:
60: /* Output #ident as a .ident. */
61:
62: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
63:
64: /* We do not want to output SDB debugging information. */
65:
66: #undef SDB_DEBUGGING_INFO
67:
68: /* We want to output DBX debugging information. */
69:
70: #define DBX_DEBUGGING_INFO
71:
72: /* Implicit library calls should use memcpy, not bcopy, etc. */
73:
74: #define TARGET_MEM_FUNCTIONS
75:
76: /* Writing `int' for a bitfield forces int alignment for the structure. */
77:
78: #define PCC_BITFIELD_TYPE_MATTERS 1
79:
80: #undef ASM_FILE_START
81: #define ASM_FILE_START(FILE) \
82: fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
83:
84: /* This is how to output a reference to a user-level label named NAME. */
85: #undef ASM_OUTPUT_LABELREF
86: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
87: fprintf (FILE, "_%s", NAME)
88:
89: #if 0 /* People say gas uses the log as the arg to .align. */
90: /* When using gas, .align N aligns to an N-byte boundary. */
91:
92: #undef ASM_OUTPUT_ALIGN
93: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
94: if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
95: #endif
96:
97: /* Align labels, etc. at 4-byte boundaries. */
98:
99: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
100: fprintf ((FILE), "\t.align 2\n"); /* Use log of 4 as arg. */
101:
102: #if 0
103: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
104: fprintf ((FILE), "\t.align 4\n");
105: #endif
106:
107: /* Machines that use the AT&T assembler syntax
108: also return floating point values in an FP register. */
109: /* Define how to find the value returned by a function.
110: VALTYPE is the data type of the value (as a tree).
111: If the precise function being called is known, FUNC is its FUNCTION_DECL;
112: otherwise, FUNC is 0. */
113:
114: #define VALUE_REGNO(MODE) \
115: (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
116:
117: /* 1 if N is a possible register number for a function value. */
118:
119: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
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