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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:
1.1.1.2 ! root 45: #if 0 /* These aren't right for GNU ld. */
1.1 root 46: /* Use crt1.o as a startup file and crtn.o as a closing file. */
47:
48: #define STARTFILE_SPEC \
49: "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
50:
51: #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
1.1.1.2 ! root 52: #endif
1.1 root 53:
54: /* Specify predefined symbols in preprocessor. */
55:
56: #define CPP_PREDEFINES "-Dunix -Di386"
57:
58: /* Allow #sccs in preprocessor. */
59:
60: #define SCCS_DIRECTIVE
61:
62: /* Output #ident as a .ident. */
63:
64: #define ASM_OUTPUT_IDENT(FILE, NAME) fprintf (FILE, "\t.ident \"%s\"\n", NAME);
65:
66: /* We do not want to output SDB debugging information. */
67:
68: #undef SDB_DEBUGGING_INFO
69:
70: /* We want to output DBX debugging information. */
71:
72: #define DBX_DEBUGGING_INFO
73:
74: /* Implicit library calls should use memcpy, not bcopy, etc. */
75:
76: #define TARGET_MEM_FUNCTIONS
77:
78: /* Writing `int' for a bitfield forces int alignment for the structure. */
79:
80: #define PCC_BITFIELD_TYPE_MATTERS 1
81:
82: #undef ASM_FILE_START
83: #define ASM_FILE_START(FILE) \
84: fprintf (FILE, "\t.file\t\"%s\"\n", dump_base_name);
85:
86: /* This is how to output a reference to a user-level label named NAME. */
87: #undef ASM_OUTPUT_LABELREF
88: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
89: fprintf (FILE, "_%s", NAME)
90:
91: #if 0 /* People say gas uses the log as the arg to .align. */
92: /* When using gas, .align N aligns to an N-byte boundary. */
93:
94: #undef ASM_OUTPUT_ALIGN
95: #define ASM_OUTPUT_ALIGN(FILE,LOG) \
96: if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
97: #endif
98:
99: /* Align labels, etc. at 4-byte boundaries. */
100:
101: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
102: fprintf ((FILE), "\t.align 2\n"); /* Use log of 4 as arg. */
103:
104: #if 0
105: #define ASM_OUTPUT_ALIGN_CODE(FILE) \
106: fprintf ((FILE), "\t.align 4\n");
107: #endif
108:
109: /* Machines that use the AT&T assembler syntax
110: also return floating point values in an FP register. */
111: /* Define how to find the value returned by a function.
112: VALTYPE is the data type of the value (as a tree).
113: If the precise function being called is known, FUNC is its FUNCTION_DECL;
114: otherwise, FUNC is 0. */
115:
116: #define VALUE_REGNO(MODE) \
117: (((MODE)==SFmode || (MODE)==DFmode) ? FIRST_FLOAT_REG : 0)
118:
119: /* 1 if N is a possible register number for a function value. */
120:
121: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
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