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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/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 "i386/att.h"
31:
32: /* Use crt1.o as a startup file and crtn.o as a closing file. */
33:
34: #define STARTFILE_SPEC \
35: "%{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\
36: %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
37:
38: /* ??? There is a suggestion that -lg is needed here.
39: Does anyone know whether this is right? */
40: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
41:
42: /* Specify predefined symbols in preprocessor. */
43:
44: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Asystem(svr3) -Acpu(i386) -Amachine(i386)"
45:
46: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
47:
48: /* Writing `int' for a bitfield forces int alignment for the structure. */
49:
50: #define PCC_BITFIELD_TYPE_MATTERS 1
51:
52: /* Don't write a `.optim' pseudo; this assembler doesn't handle them. */
53:
54: #undef ASM_FILE_START_1
55: #define ASM_FILE_START_1(FILE)
56:
57: /* longjmp may fail to restore the registers if called from the same
58: function that called setjmp. To compensate, the compiler avoids
59: putting variables in registers in functions that use both setjmp
60: and longjmp. */
61:
62: #define NON_SAVING_SETJMP \
63: (current_function_calls_setjmp && current_function_calls_longjmp)
64:
65: /* longjmp may fail to restore the stack pointer if the saved frame
66: pointer is the same as the caller's frame pointer. Requiring a frame
67: pointer in any function that calls setjmp or longjmp avoids this
68: problem, unless setjmp and longjmp are called from the same function.
69: Since a frame pointer will be required in such a function, it is OK
70: that the stack pointer is not restored. */
71:
72: #undef FRAME_POINTER_REQUIRED
73: #define FRAME_POINTER_REQUIRED \
74: (current_function_calls_setjmp || current_function_calls_longjmp)
75:
76: /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib. */
77: #undef ASM_OUTPUT_LOCAL
78: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
79: do { \
80: int align = exact_log2 (ROUNDED); \
81: if (align > 2) align = 2; \
82: if (TARGET_SVR3_SHLIB) \
83: data_section (); \
84: else \
85: bss_section (); \
86: ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
87: ASM_OUTPUT_LABEL ((FILE), (NAME)); \
88: fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
89: } while (0)
90:
91: /* Define a few machine-specific details of the implementation of
92: constructors.
93:
94: The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
95: and CTOR_LIST_END to contribute to the .init section an instruction to
96: push a word containing 0 (or some equivalent of that).
97:
98: ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
99: constructor. */
100:
101: #undef INIT_SECTION_ASM_OP
102: #define INIT_SECTION_ASM_OP ".section .init,\"x\""
103:
104: #define CTOR_LIST_BEGIN \
105: asm (INIT_SECTION_ASM_OP); \
106: asm ("pushl $0")
107: #define CTOR_LIST_END CTOR_LIST_BEGIN
108:
109: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
110: do { \
111: init_section (); \
112: fprintf (FILE, "\tpushl $"); \
113: assemble_name (FILE, NAME); \
114: fprintf (FILE, "\n"); \
115: } while (0)
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