mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 03:10:05 +00:00
6fe93e82bb
2003-07-05 Richard Henderson <rth@redhat.com> * sysdeps/alpha/elf/initfini.c: Avoid .ent/.end.
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/* Special .init and .fini section support for Alpha.
|
|
Copyright (C) 2001, 2002, 2003 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
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; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* 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.
|
|
|
|
This differs from what would be generated by the generic code in that
|
|
we save and restore the GP within the function. In order for linker
|
|
relaxation to work, the value in the GP register on exit from a function
|
|
must be valid for the function entry point. Normally, a function is
|
|
contained within one object file and this is not an issue, provided
|
|
that the function reloads the gp after making any function calls.
|
|
However, _init and _fini are constructed from pieces of many object
|
|
files, all of which may have different GP values. So we must reload
|
|
the GP value from crti.o in crtn.o. */
|
|
|
|
__asm__ (" \n\
|
|
#include \"defs.h\" \n\
|
|
\n\
|
|
/*@HEADER_ENDS*/ \n\
|
|
\n\
|
|
/*@_init_PROLOG_BEGINS*/ \n\
|
|
.section .init, \"ax\", @progbits \n\
|
|
.globl _init \n\
|
|
.type _init, @function \n\
|
|
.usepv _init, std \n\
|
|
_init: \n\
|
|
ldgp $29, 0($27) \n\
|
|
subq $30, 16, $30 \n\
|
|
lda $27, __gmon_start__ \n\
|
|
stq $26, 0($30) \n\
|
|
stq $29, 8($30) \n\
|
|
beq $27, 1f \n\
|
|
jsr $26, ($27), __gmon_start__ \n\
|
|
ldq $29, 8($30) \n\
|
|
.align 3 \n\
|
|
1: \n\
|
|
/*@_init_PROLOG_ENDS*/ \n\
|
|
\n\
|
|
/*@_init_EPILOG_BEGINS*/ \n\
|
|
.section .init, \"ax\", @progbits \n\
|
|
ldq $26, 0($30) \n\
|
|
ldq $29, 8($30) \n\
|
|
addq $30, 16, $30 \n\
|
|
ret \n\
|
|
/*@_init_EPILOG_ENDS*/ \n\
|
|
\n\
|
|
/*@_fini_PROLOG_BEGINS*/ \n\
|
|
.section .fini, \"ax\", @progbits \n\
|
|
.globl _fini \n\
|
|
.type _fini,@function \n\
|
|
.usepv _fini,std \n\
|
|
_fini: \n\
|
|
ldgp $29, 0($27) \n\
|
|
subq $30, 16, $30 \n\
|
|
stq $26, 0($30) \n\
|
|
stq $29, 8($30) \n\
|
|
.align 3 \n\
|
|
/*@_fini_PROLOG_ENDS*/ \n\
|
|
\n\
|
|
/*@_fini_EPILOG_BEGINS*/ \n\
|
|
.section .fini, \"ax\", @progbits \n\
|
|
ldq $26, 0($30) \n\
|
|
ldq $29, 8($30) \n\
|
|
addq $30, 16, $30 \n\
|
|
ret \n\
|
|
/*@_fini_EPILOG_ENDS*/ \n\
|
|
\n\
|
|
/*@TRAILER_BEGINS*/ \n\
|
|
");
|