1 /* Special .init and .fini section support. Linuxthread version.
2 Copyright (C) 1995, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it
6 and/or modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 In addition to the permissions in the GNU Lesser General Public
11 License, the Free Software Foundation gives you unlimited
12 permission to link the compiled version of this file with other
13 programs, and to distribute those programs without any restriction
14 coming from the use of this file. (The Lesser General Public
15 License restrictions do apply in other respects; for example, they
16 cover modification of the file, and distribution when not linked
17 into another program.)
18
19 The GNU C Library is distributed in the hope that it will be
20 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
21 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU Lesser General Public License for more details.
23
24 You should have received a copy of the GNU Lesser General Public
25 License along with the GNU C Library; see the file COPYING.LIB. If not,
26 write to the Free Software Foundation, 59 Temple Place - Suite 330,
27 Boston, MA 02111-1307, USA. */
28
29 /* This file is compiled into assembly code which is then munged by a sed
30 script into two files: crti.s and crtn.s.
31
32 * crti.s puts a function prologue at the beginning of the
33 .init and .fini sections and defines global symbols for
34 those addresses, so they can be called as functions.
35
36 * crtn.s puts the corresponding function epilogues
37 in the .init and .fini sections. */
38
39 #include <stdlib.h>
40
41 /* We use embedded asm for .section unconditionally, as this makes it
42 easier to insert the necessary directives into crtn.S. */
43 #define SECTION(x) __asm__ (".section " x )
44
45 /* Embed an #include to pull in the alignment and .end directives. */
46 __asm__ ("\n#include \"defs.h\"");
47
48 /* The initial common code ends here. */
49 __asm__ ("\n/*@HEADER_ENDS*/");
50
51 /* To determine whether we need .end and .align: */
52 __asm__ ("\n/*@TESTS_BEGIN*/");
53 extern void dummy (void (*foo) (void));
54 void
dummy(void (* foo)(void))55 dummy (void (*foo) (void))
56 {
57 if (foo)
58 (*foo) ();
59 }
60 __asm__ ("\n/*@TESTS_END*/");
61
62 /* The beginning of _init: */
63 __asm__ ("\n/*@_init_PROLOG_BEGINS*/");
64
65 static void
call_initialize_minimal(void)66 call_initialize_minimal (void)
67 {
68 extern void __pthread_initialize_minimal (void);
69
70 __pthread_initialize_minimal ();
71 }
72
73 SECTION (".init");
74 extern void _init (void);
75 void
_init(void)76 _init (void)
77 {
78 /* The very first thing we must do is to set up the registers. */
79 call_initialize_minimal ();
80
81 __asm__ ("ALIGN");
82 __asm__("END_INIT");
83 /* Now the epilog. */
84 __asm__ ("\n/*@_init_PROLOG_ENDS*/");
85 __asm__ ("\n/*@_init_EPILOG_BEGINS*/");
86 SECTION(".init");
87 }
88 __asm__ ("END_INIT");
89
90 /* End of the _init epilog, beginning of the _fini prolog. */
91 __asm__ ("\n/*@_init_EPILOG_ENDS*/");
92 __asm__ ("\n/*@_fini_PROLOG_BEGINS*/");
93
94 SECTION (".fini");
95 extern void _fini (void);
96 void
_fini(void)97 _fini (void)
98 {
99
100 /* End of the _fini prolog. */
101 __asm__ ("ALIGN");
102 __asm__ ("END_FINI");
103 __asm__ ("\n/*@_fini_PROLOG_ENDS*/");
104
105 {
106 /* Let GCC know that _fini is not a leaf function by having a dummy
107 function call here. We arrange for this call to be omitted from
108 either crt file. */
109 extern void i_am_not_a_leaf (void);
110 i_am_not_a_leaf ();
111 }
112
113 /* Beginning of the _fini epilog. */
114 __asm__ ("\n/*@_fini_EPILOG_BEGINS*/");
115 SECTION (".fini");
116 }
117 __asm__ ("END_FINI");
118
119 /* End of the _fini epilog. Any further generated assembly (e.g. .ident)
120 is shared between both crt files. */
121 __asm__ ("\n/*@_fini_EPILOG_ENDS*/");
122 __asm__ ("\n/*@TRAILER_BEGINS*/");
123
124 /* End of file. */
125