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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:
1.1.1.2 ! root 42: /* ??? There is a suggestion that -lg is needed here.
! 43: Does anyone know whether this is right? */
1.1 root 44: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
45:
46: /* Specify predefined symbols in preprocessor. */
47:
48: #define CPP_PREDEFINES "-Dunix -Di386"
49:
50: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
51:
52: /* Writing `int' for a bitfield forces int alignment for the structure. */
53:
54: #define PCC_BITFIELD_TYPE_MATTERS 1
55:
56: /* Don't write a `.optim' pseudo; this assembler doesn't handle them. */
57:
58: #undef ASM_FILE_START_1
59: #define ASM_FILE_START_1(FILE)
60:
61: /* Machines that use the AT&T assembler syntax
62: also return floating point values in an FP register. */
63: /* Define how to find the value returned by a function.
64: VALTYPE is the data type of the value (as a tree).
65: If the precise function being called is known, FUNC is its FUNCTION_DECL;
66: otherwise, FUNC is 0. */
67:
68: #define VALUE_REGNO(MODE) \
69: (((MODE) == SFmode || (MODE) == DFmode) ? FIRST_FLOAT_REG : 0)
70:
71: /* 1 if N is a possible register number for a function value. */
72:
73: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N)== FIRST_FLOAT_REG)
74:
75: #if 0 /* This symbol is expected to exist only on BSD,
76: and besides, it describes the host rather than the target.
77: It certainly does not belong here. */
78: #ifndef MAXPATHLEN
79: #define MAXPATHLEN 1024
80: #endif
81: #endif
82:
83: /* longjmp may fail to restore the registers if called from the same
84: function that called setjmp. To compensate, the compiler avoids
85: putting variables in registers in functions that use both setjmp
86: and longjmp. */
87:
88: #define NON_SAVING_SETJMP \
89: (current_function_calls_setjmp && current_function_calls_longjmp)
90:
91: /* longjmp may fail to restore the stack pointer if the saved frame
92: pointer is the same as the caller's frame pointer. Requiring a frame
93: pointer in any function that calls setjmp or longjmp avoids this
94: problem, unless setjmp and longjmp are called from the same function.
95: Since a frame pointer will be required in such a function, it is OK
96: that the stack pointer is not restored. */
97:
98: #undef FRAME_POINTER_REQUIRED
99: #define FRAME_POINTER_REQUIRED \
100: (current_function_calls_setjmp || current_function_calls_longjmp)
101:
1.1.1.2 ! root 102: /* Define a few machine-specific details of the implementation of
! 103: constructors.
1.1 root 104:
1.1.1.2 ! root 105: The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
! 106: and CTOR_LIST_END to contribute to the .init section an instruction to
! 107: push a word containing 0 (or some equivalent of that).
1.1 root 108:
1.1.1.2 ! root 109: ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
! 110: constructor. */
1.1 root 111:
112: #undef INIT_SECTION_ASM_OP
113: #define INIT_SECTION_ASM_OP ".section .init,\"x\""
114:
1.1.1.2 ! root 115: #define CTOR_LIST_BEGIN \
! 116: asm (INIT_SECTION_ASM_OP); \
! 117: asm ("pushl $0")
! 118: #define CTOR_LIST_END CTOR_LIST_BEGIN
1.1 root 119:
120: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
121: do { \
122: init_section (); \
123: fprintf (FILE, "\tpushl $"); \
124: assemble_name (FILE, NAME); \
125: fprintf (FILE, "\n"); \
126: } while (0)
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