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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
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/* Special .init and .fini section support for Alpha.
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Copyright (C) 2001 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__ ("
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#include \"defs.h\"
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/*@HEADER_ENDS*/
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/*@_init_PROLOG_BEGINS*/
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.section .init, \"ax\", @progbits
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.globl _init
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.ent _init
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_init:
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ldgp $29, 0($27)
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subq $30, 16, $30
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lda $27, __gmon_start__
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stq $26, 0($30)
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stq $29, 8($30)
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.prologue 1
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beq $27, 1f
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jsr $26, ($27), __gmon_start__
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ldq $29, 8($30)
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1:
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.align 3
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.end _init
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.size _init, 0
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/*@_init_PROLOG_ENDS*/
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/*@_init_EPILOG_BEGINS*/
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.section .init, \"ax\", @progbits
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ldq $26, 0($30)
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ldq $29, 8($30)
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addq $30, 16, $30
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ret
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/*@_init_EPILOG_ENDS*/
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/*@_fini_PROLOG_BEGINS*/
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.section .fini, \"ax\", @progbits
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.globl _fini
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.ent _fini
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_fini:
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ldgp $29, 0($27)
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subq $30, 16, $30
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stq $26, 0($30)
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stq $29, 8($30)
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.prologue 1
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.align 3
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.end _fini
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.size _fini, 0
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/*@_fini_PROLOG_ENDS*/
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/*@_fini_EPILOG_BEGINS*/
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.section .fini, \"ax\", @progbits
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ldq $26, 0($30)
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ldq $29, 8($30)
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addq $30, 16, $30
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ret
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/*@_fini_EPILOG_ENDS*/
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/*@TRAILER_BEGINS*/
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");
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