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1.1 root 1: /* Definitions for Intel 386 running system V.
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:
23: /* Use default settings for system V.3. */
24:
25: #include "svr3.h"
26:
27: /* Use the ATT assembler syntax.
28: This overrides at least one macro (ASM_OUTPUT_LABELREF) from svr3.h. */
29:
30: #include "att386.h"
31:
32: /* By default, target has a 80387. */
33:
34: #define TARGET_DEFAULT 1
35:
36: /* Use crt1.o as a startup file and crtn.o as a closing file. */
37:
38: #define STARTFILE_SPEC \
39: "%{pg:gcrt1.o%s}%{!pg:%{posix:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}%{!posix:%{p:mcrt1.o%s}%{!p:crt1.o%s}}} crtbegin.o%s\
40: %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
41:
42: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
43:
44: /* Specify predefined symbols in preprocessor. */
45:
46: #define CPP_PREDEFINES "-Dunix -Di386"
47:
48: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
49:
50: /* Writing `int' for a bitfield forces int alignment for the structure. */
51:
52: #define PCC_BITFIELD_TYPE_MATTERS 1
53:
54: /* Don't write a `.optim' pseudo; this assembler doesn't handle them. */
55:
56: #undef ASM_FILE_START_1
57: #define ASM_FILE_START_1(FILE)
58:
59: /* Machines that use the AT&T assembler syntax
60: also return floating point values in an FP register. */
61: /* Define how to find the value returned by a function.
62: VALTYPE is the data type of the value (as a tree).
63: If the precise function being called is known, FUNC is its FUNCTION_DECL;
64: otherwise, FUNC is 0. */
65:
66: #define VALUE_REGNO(MODE) \
67: (((MODE) == SFmode || (MODE) == DFmode) ? FIRST_FLOAT_REG : 0)
68:
69: /* 1 if N is a possible register number for a function value. */
70:
71: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
72:
73: #if 0 /* This symbol is expected to exist only on BSD,
74: and besides, it describes the host rather than the target.
75: It certainly does not belong here. */
76: #ifndef MAXPATHLEN
77: #define MAXPATHLEN 1024
78: #endif
79: #endif
80:
81: /* longjmp may fail to restore the registers if called from the same
82: function that called setjmp. To compensate, the compiler avoids
83: putting variables in registers in functions that use both setjmp
84: and longjmp. */
85:
86: #define NON_SAVING_SETJMP \
87: (current_function_calls_setjmp && current_function_calls_longjmp)
88:
89: /* longjmp may fail to restore the stack pointer if the saved frame
90: pointer is the same as the caller's frame pointer. Requiring a frame
91: pointer in any function that calls setjmp or longjmp avoids this
92: problem, unless setjmp and longjmp are called from the same function.
93: Since a frame pointer will be required in such a function, it is OK
94: that the stack pointer is not restored. */
95:
96: #undef FRAME_POINTER_REQUIRED
97: #define FRAME_POINTER_REQUIRED \
98: (current_function_calls_setjmp || current_function_calls_longjmp)
99:
100: /* Define a few machine-specific details
101: of the implementation of constructors.
102:
103: CTORS_SECTION_ASM_OP should be defined to concatenate
104: the macro INIT_SECTION_ASM_OP, a newline, and a push instruction
105: to push a word containing 0 (or some equivalent of that).
106:
107: ASM_OUTPUT_CONSTRUCTOR should be defined
108: to push the address of the constructor. */
109:
110: #undef INIT_SECTION_ASM_OP
111: #define INIT_SECTION_ASM_OP ".section .init,\"x\""
112:
113: #define CTORS_SECTION_ASM_OP \
114: INIT_SECTION_ASM_OP "\n" \
115: "\tpushl $0\n\t" \
116: DATA_SECTION_ASM_OP
117: /* The reason we end with DATA_SECTION_ASM_OP is to prevent the
118: initial and final table elements (see crtstuff.c) from getting into
119: the .init section and causing a crash. */
120:
121: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
122: do { \
123: init_section (); \
124: fprintf (FILE, "\tpushl $"); \
125: assemble_name (FILE, NAME); \
126: fprintf (FILE, "\n"); \
127: } while (0)
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