Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/m32r/initfini.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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1 /* .init/.fini section handling + C++ global constructor/destructor handling. | |
2 This file is based on crtstuff.c, sol2-crti.asm, sol2-crtn.asm. | |
3 | |
4 Copyright (C) 1996, 1997, 1998, 2006, 2009 Free Software Foundation, Inc. | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify | |
9 it under the terms of the GNU General Public License as published by | |
10 the Free Software Foundation; either version 3, or (at your option) | |
11 any later version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, | |
14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 GNU General Public License for more details. | |
17 | |
18 Under Section 7 of GPL version 3, you are granted additional | |
19 permissions described in the GCC Runtime Library Exception, version | |
20 3.1, as published by the Free Software Foundation. | |
21 | |
22 You should have received a copy of the GNU General Public License and | |
23 a copy of the GCC Runtime Library Exception along with this program; | |
24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
25 <http://www.gnu.org/licenses/>. */ | |
26 | |
27 /* Declare a pointer to void function type. */ | |
28 typedef void (*func_ptr) (void); | |
29 | |
30 #ifdef CRT_INIT | |
31 | |
32 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange | |
33 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
34 __DTOR_END__ } per root executable and also one set of these symbols | |
35 per shared library. So in any given whole process image, we may have | |
36 multiple definitions of each of these symbols. In order to prevent | |
37 these definitions from conflicting with one another, and in order to | |
38 ensure that the proper lists are used for the initialization/finalization | |
39 of each individual shared library (respectively), we give these symbols | |
40 only internal (i.e. `static') linkage, and we also make it a point to | |
41 refer to only the __CTOR_END__ symbol in crtfini.o and the __DTOR_LIST__ | |
42 symbol in crtinit.o, where they are defined. */ | |
43 | |
44 static func_ptr __CTOR_LIST__[1] | |
45 __attribute__ ((used, section (".ctors"))) | |
46 = { (func_ptr) (-1) }; | |
47 | |
48 static func_ptr __DTOR_LIST__[1] | |
49 __attribute__ ((used, section (".dtors"))) | |
50 = { (func_ptr) (-1) }; | |
51 | |
52 /* Run all the global destructors on exit from the program. */ | |
53 | |
54 /* Some systems place the number of pointers in the first word of the | |
55 table. On SVR4 however, that word is -1. In all cases, the table is | |
56 null-terminated. On SVR4, we start from the beginning of the list and | |
57 invoke each per-compilation-unit destructor routine in order | |
58 until we find that null. | |
59 | |
60 Note that this function MUST be static. There will be one of these | |
61 functions in each root executable and one in each shared library, but | |
62 although they all have the same code, each one is unique in that it | |
63 refers to one particular associated `__DTOR_LIST__' which belongs to the | |
64 same particular root executable or shared library file. */ | |
65 | |
66 static void __do_global_dtors (void) | |
67 asm ("__do_global_dtors") __attribute__ ((used, section (".text"))); | |
68 | |
69 static void | |
70 __do_global_dtors (void) | |
71 { | |
72 func_ptr *p; | |
73 | |
74 for (p = __DTOR_LIST__ + 1; *p; p++) | |
75 (*p) (); | |
76 } | |
77 | |
78 /* .init section start. | |
79 This must appear at the start of the .init section. */ | |
80 | |
81 asm ("\n\ | |
82 .section .init,\"ax\",@progbits\n\ | |
83 .balign 4\n\ | |
84 .global __init\n\ | |
85 __init:\n\ | |
86 push fp\n\ | |
87 push lr\n\ | |
88 mv fp,sp\n\ | |
89 seth r0, #shigh(__fini)\n\ | |
90 add3 r0, r0, #low(__fini)\n\ | |
91 bl atexit\n\ | |
92 .fillinsn\n\ | |
93 "); | |
94 | |
95 /* .fini section start. | |
96 This must appear at the start of the .init section. */ | |
97 | |
98 asm ("\n\ | |
99 .section .fini,\"ax\",@progbits\n\ | |
100 .balign 4\n\ | |
101 .global __fini\n\ | |
102 __fini:\n\ | |
103 push fp\n\ | |
104 push lr\n\ | |
105 mv fp,sp\n\ | |
106 bl __do_global_dtors\n\ | |
107 .fillinsn\n\ | |
108 "); | |
109 | |
110 #endif /* CRT_INIT */ | |
111 | |
112 #ifdef CRT_FINI | |
113 | |
114 /* Put a word containing zero at the end of each of our two lists of function | |
115 addresses. Note that the words defined here go into the .ctors and .dtors | |
116 sections of the crtend.o file, and since that file is always linked in | |
117 last, these words naturally end up at the very ends of the two lists | |
118 contained in these two sections. */ | |
119 | |
120 static func_ptr __CTOR_END__[1] | |
121 __attribute__ ((used, section (".ctors"))) | |
122 = { (func_ptr) 0 }; | |
123 | |
124 static func_ptr __DTOR_END__[1] | |
125 __attribute__ ((used, section (".dtors"))) | |
126 = { (func_ptr) 0 }; | |
127 | |
128 /* Run all global constructors for the program. | |
129 Note that they are run in reverse order. */ | |
130 | |
131 static void __do_global_ctors (void) | |
132 asm ("__do_global_ctors") __attribute__ ((used, section (".text"))); | |
133 | |
134 static void | |
135 __do_global_ctors (void) | |
136 { | |
137 func_ptr *p; | |
138 | |
139 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
140 (*p) (); | |
141 } | |
142 | |
143 /* .init section end. | |
144 This must live at the end of the .init section. */ | |
145 | |
146 asm ("\n\ | |
147 .section .init,\"ax\",@progbits\n\ | |
148 bl __do_global_ctors\n\ | |
149 mv sp,fp\n\ | |
150 pop lr\n\ | |
151 pop fp\n\ | |
152 jmp lr\n\ | |
153 .fillinsn\n\ | |
154 "); | |
155 | |
156 /* .fini section end. | |
157 This must live at the end of the .fini section. */ | |
158 | |
159 asm ("\n\ | |
160 .section .fini,\"ax\",@progbits\n\ | |
161 mv sp,fp\n\ | |
162 pop lr\n\ | |
163 pop fp\n\ | |
164 jmp lr\n\ | |
165 .fillinsn\n\ | |
166 "); | |
167 | |
168 #endif /* CRT_FINI */ |