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d928ab87 | 1 | /* Special .init and .fini section support for IA64. |
f7a9f785 | 2 | Copyright (C) 2000-2016 Free Software Foundation, Inc. |
d928ab87 MF |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | 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 GNU 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 | Note that people who make modified versions of this file are not | |
20 | obligated to grant this special exception for their modified | |
21 | versions; it is their choice whether to do so. The GNU Lesser | |
22 | General Public License gives permission to release a modified | |
23 | version without this exception; this exception also makes it | |
24 | possible to release a modified version which carries forward this | |
25 | exception. | |
26 | ||
27 | The GNU C Library is distributed in the hope that it will be useful, | |
28 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
30 | Lesser General Public License for more details. | |
31 | ||
32 | You should have received a copy of the GNU Lesser General Public | |
33 | License along with the GNU C Library. If not, see | |
34 | <http://www.gnu.org/licenses/>. */ | |
35 | ||
36 | /* crti.S puts a function prologue at the beginning of the .init and | |
37 | .fini sections and defines global symbols for those addresses, so | |
38 | they can be called as functions. The symbols _init and _fini are | |
39 | magic and cause the linker to emit DT_INIT and DT_FINI. */ | |
40 | ||
41 | #include <libc-symbols.h> | |
42 | #include <sysdep.h> | |
43 | #undef ret | |
44 | ||
45 | #ifndef PREINIT_FUNCTION | |
46 | # define PREINIT_FUNCTION __gmon_start__ | |
47 | #endif | |
48 | ||
49 | #ifndef PREINIT_FUNCTION_WEAK | |
50 | # define PREINIT_FUNCTION_WEAK 1 | |
51 | #endif | |
52 | ||
53 | #if PREINIT_FUNCTION_WEAK | |
54 | weak_extern (PREINIT_FUNCTION) | |
55 | #else | |
56 | .hidden PREINIT_FUNCTION | |
57 | #endif | |
58 | ||
59 | /* If we have working .init_array support, we want to keep the .init | |
60 | section empty (apart from the mandatory prologue/epilogue. This | |
61 | ensures that the default unwind conventions (return-pointer in b0, | |
62 | frame state in ar.pfs, etc.) will do the Right Thing. To ensure | |
63 | an empty .init section, we register gmon_initializer() via the | |
64 | .init_array. | |
65 | ||
66 | --davidm 02/10/29 */ | |
67 | ||
68 | #if PREINIT_FUNCTION_WEAK | |
69 | /* This blob of assembly code is one simple C function: | |
70 | ||
71 | static void | |
72 | __attribute__ ((used)) | |
73 | gmon_initializer (void) | |
74 | { | |
75 | extern void weak_function __gmon_start__ (void); | |
76 | ||
77 | if (__gmon_start__) | |
78 | (*__gmon_start__)(); | |
79 | } | |
80 | */ | |
81 | .text | |
82 | .align 64 | |
83 | .proc gmon_initializer# | |
84 | gmon_initializer: | |
85 | .prologue 12, 32 | |
86 | .mmi | |
87 | .save ar.pfs, r33 | |
88 | alloc r33 = ar.pfs, 0, 3, 0, 0 | |
89 | addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp | |
90 | .save rp, r32 | |
91 | mov r32 = b0 | |
92 | .mmi | |
93 | mov r34 = r1 | |
94 | .body | |
95 | ;; | |
96 | ld8 r14 = [r14] | |
97 | nop 0 | |
98 | ;; | |
99 | .mib | |
100 | cmp.eq p6, p7 = 0, r14 | |
101 | nop 0 | |
102 | (p6) br.cond.spnt .L1 | |
103 | ;; | |
104 | .mib | |
105 | nop 0 | |
106 | nop 0 | |
107 | br.call.sptk.many b0 = PREINIT_FUNCTION# | |
108 | ;; | |
109 | .mmi | |
110 | mov r1 = r34 | |
111 | nop 0 | |
112 | nop 0 | |
113 | .L1: | |
114 | .mii | |
115 | nop 0 | |
116 | mov ar.pfs = r33 | |
117 | nop 0 | |
118 | ;; | |
119 | .mib | |
120 | nop 0 | |
121 | mov b0 = r32 | |
122 | br.ret.sptk.many b0 | |
123 | .endp gmon_initializer# | |
124 | # undef PREINIT_FUNCTION | |
125 | # define PREINIT_FUNCTION gmon_initializer | |
126 | #endif | |
127 | .section .init_array, "aw" | |
128 | data8 @fptr(PREINIT_FUNCTION) | |
129 | ||
130 | .section .init,"ax",@progbits | |
131 | .global _init# | |
132 | .proc _init# | |
133 | _init: | |
134 | .prologue | |
135 | .save ar.pfs, r34 | |
136 | alloc r34 = ar.pfs, 0, 3, 0, 0 | |
137 | .vframe r32 | |
138 | mov r32 = r12 | |
139 | .save rp, r33 | |
140 | mov r33 = b0 | |
141 | .body | |
142 | adds r12 = -16, r12 | |
143 | ;; /* see gmon_initializer() above */ | |
144 | .endp _init# | |
145 | ||
146 | .section .fini,"ax",@progbits | |
147 | .global _fini# | |
148 | .proc _fini# | |
149 | _fini: | |
150 | .prologue | |
151 | .save ar.pfs, r34 | |
152 | alloc r34 = ar.pfs, 0, 3, 0, 0 | |
153 | .vframe r32 | |
154 | mov r32 = r12 | |
155 | .save rp, r33 | |
156 | mov r33 = b0 | |
157 | .body | |
158 | adds r12 = -16, r12 | |
159 | ;; | |
160 | .endp _fini# |