94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/* Special .init and .fini section support for Alpha.
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Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* This file is compiled into assembly code which is then munged by a sed
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script into two files: crti.s and crtn.s.
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* crti.s puts a function prologue at the beginning of the .init and .fini
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sections and defines global symbols for those addresses, so they can be
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called as functions.
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* crtn.s puts the corresponding function epilogues in the .init and .fini
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sections.
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This differs from what would be generated by the generic code in that
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we save and restore the GP within the function. In order for linker
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relaxation to work, the value in the GP register on exit from a function
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must be valid for the function entry point. Normally, a function is
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contained within one object file and this is not an issue, provided
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that the function reloads the gp after making any function calls.
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However, _init and _fini are constructed from pieces of many object
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files, all of which may have different GP values. So we must reload
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the GP value from crti.o in crtn.o. */
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__asm__ (" \n\
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#include \"defs.h\" \n\
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\n\
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/*@HEADER_ENDS*/ \n\
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\n\
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/*@_init_PROLOG_BEGINS*/ \n\
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.section .init, \"ax\", @progbits \n\
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.globl _init \n\
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.type _init, @function \n\
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.usepv _init, std \n\
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_init: \n\
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ldgp $29, 0($27) \n\
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subq $30, 16, $30 \n\
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lda $27, __gmon_start__ \n\
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stq $26, 0($30) \n\
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stq $29, 8($30) \n\
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beq $27, 1f \n\
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jsr $26, ($27), __gmon_start__ \n\
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ldq $29, 8($30) \n\
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.align 3 \n\
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1: \n\
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/*@_init_PROLOG_ENDS*/ \n\
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\n\
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/*@_init_EPILOG_BEGINS*/ \n\
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.section .init, \"ax\", @progbits \n\
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ldq $26, 0($30) \n\
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ldq $29, 8($30) \n\
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addq $30, 16, $30 \n\
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ret \n\
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/*@_init_EPILOG_ENDS*/ \n\
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\n\
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/*@_fini_PROLOG_BEGINS*/ \n\
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.section .fini, \"ax\", @progbits \n\
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.globl _fini \n\
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.type _fini,@function \n\
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.usepv _fini,std \n\
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_fini: \n\
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ldgp $29, 0($27) \n\
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subq $30, 16, $30 \n\
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stq $26, 0($30) \n\
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stq $29, 8($30) \n\
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.align 3 \n\
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/*@_fini_PROLOG_ENDS*/ \n\
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\n\
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/*@_fini_EPILOG_BEGINS*/ \n\
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.section .fini, \"ax\", @progbits \n\
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ldq $26, 0($30) \n\
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ldq $29, 8($30) \n\
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addq $30, 16, $30 \n\
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ret \n\
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/*@_fini_EPILOG_ENDS*/ \n\
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\n\
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/*@TRAILER_BEGINS*/ \n\
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");
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