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Up to [GCC 2.x] / gcc / config / i386|
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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
1.1.1.3 ! root 18: the Free Software Foundation, 59 Temple Place - Suite 330,
! 19: Boston, MA 02111-1307, USA. */
1.1 root 20:
21:
22: #include "i386/i386.h"
23:
24: /* Use default settings for system V.3. */
25:
26: #include "svr3.h"
27:
28: /* Use the ATT assembler syntax.
29: This overrides at least one macro (ASM_OUTPUT_LABELREF) from svr3.h. */
30:
31: #include "i386/att.h"
32:
33: /* Use crt1.o as a startup file and crtn.o as a closing file. */
34:
35: #define STARTFILE_SPEC \
36: "%{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\
37: %{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp}"
38:
39: /* ??? There is a suggestion that -lg is needed here.
40: Does anyone know whether this is right? */
41: #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s"
42:
43: /* Specify predefined symbols in preprocessor. */
44:
1.1.1.2 root 45: #define CPP_PREDEFINES "-Dunix -Di386 -Asystem(unix) -Asystem(svr3) -Acpu(i386) -Amachine(i386)"
1.1 root 46:
47: #define CPP_SPEC "%{posix:-D_POSIX_SOURCE}"
48:
49: /* Writing `int' for a bitfield forces int alignment for the structure. */
50:
51: #define PCC_BITFIELD_TYPE_MATTERS 1
52:
53: /* Don't write a `.optim' pseudo; this assembler doesn't handle them. */
54:
55: #undef ASM_FILE_START_1
56: #define ASM_FILE_START_1(FILE)
1.1.1.3 ! root 57:
! 58: /* We want to be able to get DBX debugging information via -gstabs. */
! 59:
! 60: #undef DBX_DEBUGGING_INFO
! 61: #define DBX_DEBUGGING_INFO
! 62:
! 63: #undef PREFERRED_DEBUGGING_TYPE
! 64: #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
1.1 root 65:
66: /* longjmp may fail to restore the registers if called from the same
67: function that called setjmp. To compensate, the compiler avoids
68: putting variables in registers in functions that use both setjmp
69: and longjmp. */
70:
71: #define NON_SAVING_SETJMP \
72: (current_function_calls_setjmp && current_function_calls_longjmp)
73:
74: /* longjmp may fail to restore the stack pointer if the saved frame
75: pointer is the same as the caller's frame pointer. Requiring a frame
76: pointer in any function that calls setjmp or longjmp avoids this
77: problem, unless setjmp and longjmp are called from the same function.
78: Since a frame pointer will be required in such a function, it is OK
79: that the stack pointer is not restored. */
80:
81: #undef FRAME_POINTER_REQUIRED
82: #define FRAME_POINTER_REQUIRED \
83: (current_function_calls_setjmp || current_function_calls_longjmp)
84:
85: /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib. */
86: #undef ASM_OUTPUT_LOCAL
87: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
88: do { \
89: int align = exact_log2 (ROUNDED); \
90: if (align > 2) align = 2; \
91: if (TARGET_SVR3_SHLIB) \
92: data_section (); \
93: else \
94: bss_section (); \
95: ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
96: ASM_OUTPUT_LABEL ((FILE), (NAME)); \
97: fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
98: } while (0)
99:
100: /* Define a few machine-specific details of the implementation of
101: constructors.
102:
103: The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
104: and CTOR_LIST_END to contribute to the .init section an instruction to
105: push a word containing 0 (or some equivalent of that).
106:
107: ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
108: constructor. */
109:
110: #undef INIT_SECTION_ASM_OP
111: #define INIT_SECTION_ASM_OP ".section .init,\"x\""
112:
113: #define CTOR_LIST_BEGIN \
114: asm (INIT_SECTION_ASM_OP); \
115: asm ("pushl $0")
116: #define CTOR_LIST_END CTOR_LIST_BEGIN
117:
118: #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
119: do { \
120: init_section (); \
121: fprintf (FILE, "\tpushl $"); \
122: assemble_name (FILE, NAME); \
123: fprintf (FILE, "\n"); \
124: } while (0)
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