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5c8a37f8 | 1 | /* Definitions for Intel 386 running system V. |
bc9b7c0d | 2 | Copyright (C) 1988, 1996 Free Software Foundation, Inc. |
5c8a37f8 RS |
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 | |
97aadbb9 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
5c8a37f8 RS |
20 | |
21 | ||
8bc48e34 | 22 | #include "i386/i386.h" |
5c8a37f8 RS |
23 | |
24 | /* Use default settings for system V.3. */ | |
25 | ||
26 | #include "svr3.h" | |
27 | ||
28 | /* Use the ATT assembler syntax. | |
bc9b7c0d | 29 | This overrides at least one macro (USER_LABEL_PREFIX) from svr3.h. */ |
5c8a37f8 | 30 | |
8bc48e34 | 31 | #include "i386/att.h" |
5c8a37f8 | 32 | |
5c8a37f8 RS |
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 | ||
51498d3c RS |
39 | /* ??? There is a suggestion that -lg is needed here. |
40 | Does anyone know whether this is right? */ | |
5c8a37f8 RS |
41 | #define LIB_SPEC "%{posix:-lcposix} %{shlib:-lc_s} -lc crtend.o%s crtn.o%s" |
42 | ||
43 | /* Specify predefined symbols in preprocessor. */ | |
44 | ||
8524774e | 45 | #define CPP_PREDEFINES "-Dunix -Asystem(svr3)" |
5c8a37f8 | 46 | |
1228a9bd | 47 | #define CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE}" |
5c8a37f8 RS |
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) | |
29d306d0 DE |
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 | |
5c8a37f8 | 65 | \f |
5c8a37f8 RS |
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) | |
2b15883f CH |
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) | |
5c8a37f8 | 99 | \f |
b335c2cc TW |
100 | /* Define a few machine-specific details of the implementation of |
101 | constructors. | |
5c8a37f8 | 102 | |
b335c2cc TW |
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). | |
5c8a37f8 | 106 | |
b335c2cc TW |
107 | ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the |
108 | constructor. */ | |
5c8a37f8 RS |
109 | |
110 | #undef INIT_SECTION_ASM_OP | |
111 | #define INIT_SECTION_ASM_OP ".section .init,\"x\"" | |
112 | ||
b335c2cc TW |
113 | #define CTOR_LIST_BEGIN \ |
114 | asm (INIT_SECTION_ASM_OP); \ | |
115 | asm ("pushl $0") | |
116 | #define CTOR_LIST_END CTOR_LIST_BEGIN | |
5c8a37f8 RS |
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) |