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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /* Special .init and .fini section support. Linuxthread version. Copyright (C) 1995,1996,1997,2000,2001,2002 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. In addition to the permissions in the GNU Lesser General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file with other programs, and to distribute those programs without any restriction coming from the use of this file. (The Library General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into another program.) The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ /* This file is compiled into assembly code which is then munged by a sed script into two files: crti.s and crtn.s. * crti.s puts a function prologue at the beginning of the .init and .fini sections and defines global symbols for those addresses, so they can be called as functions. * crtn.s puts the corresponding function epilogues in the .init and .fini sections. */ #include <stdlib.h> /* We use embedded asm for .section unconditionally, as this makes it easier to insert the necessary directives into crtn.S. */ #define SECTION(x) __asm__ (".section " x ) /* Embed an #include to pull in the alignment and .end directives. */ __asm__ ("\n#include \"defs.h\""); __asm__ ("\n#if defined __i686 && defined __ASSEMBLER__"); __asm__ ("\n#undef __i686"); __asm__ ("\n#define __i686 __i686"); __asm__ ("\n#endif"); /* The initial common code ends here. */ __asm__ ("\n/*@HEADER_ENDS*/"); /* To determine whether we need .end and .align: */ __asm__ ("\n/*@TESTS_BEGIN*/"); extern void dummy (void (*foo) (void)); void dummy (void (*foo) (void)) { if (foo) (*foo) (); } __asm__ ("\n/*@TESTS_END*/"); /* The beginning of _init: */ __asm__ ("\n/*@_init_PROLOG_BEGINS*/"); static void call_initialize_minimal (void) { extern void __pthread_initialize_minimal_internal (void) __attribute ((visibility ("hidden"))); __pthread_initialize_minimal_internal (); } SECTION (".init"); extern void __attribute__ ((section (".init"))) _init (void); void _init (void) { /* The very first thing we must do is to set up the registers. */ call_initialize_minimal (); __asm__ ("ALIGN"); __asm__("END_INIT"); /* Now the epilog. */ __asm__ ("\n/*@_init_PROLOG_ENDS*/"); __asm__ ("\n/*@_init_EPILOG_BEGINS*/"); SECTION(".init"); } __asm__ ("END_INIT"); /* End of the _init epilog, beginning of the _fini prolog. */ __asm__ ("\n/*@_init_EPILOG_ENDS*/"); __asm__ ("\n/*@_fini_PROLOG_BEGINS*/"); SECTION (".fini"); extern void __attribute__ ((section (".fini"))) _fini (void); void _fini (void) { /* End of the _fini prolog. */ __asm__ ("ALIGN"); __asm__ ("END_FINI"); __asm__ ("\n/*@_fini_PROLOG_ENDS*/"); /* Xtensa: It doesn't really matter whether GCC thinks this is a leaf function or not, and the scripts that are supposed to remove the call don't catch the literal, resulting in an undefined symbol reference. */ #if 0 { /* Let GCC know that _fini is not a leaf function by having a dummy function call here. We arrange for this call to be omitted from either crt file. */ extern void i_am_not_a_leaf (void); i_am_not_a_leaf (); } #endif /* Beginning of the _fini epilog. */ __asm__ ("\n/*@_fini_EPILOG_BEGINS*/"); SECTION (".fini"); } __asm__ ("END_FINI"); /* End of the _fini epilog. Any further generated assembly (e.g. .ident) is shared between both crt files. */ __asm__ ("\n/*@_fini_EPILOG_ENDS*/"); __asm__ ("\n/*@TRAILER_BEGINS*/"); /* End of file. */ |