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67c0579669
_init and _fini are special functions provided by glibc for linker to define DT_INIT and DT_FINI in executable and shared library. They should never be put in dynamic symbol table. This patch marks them as hidden to remove them from dynamic symbol table. Tested with build-many-glibcs.py. [BZ #23145] * elf/Makefile (tests-special): Add $(objpfx)check-initfini.out. ($(all-built-dso:=.dynsym): New target. (common-generated): Add $(all-built-dso:$(common-objpfx)%=%.dynsym). ($(objpfx)check-initfini.out): New target. (generated): Add check-initfini.out. * scripts/check-initfini.awk: New file. * sysdeps/aarch64/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/alpha/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/arm/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/hppa/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/i386/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/ia64/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/m68k/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/microblaze/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/mips/mips32/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/mips/mips64/n32/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/mips/mips64/n64/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/nios2/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/powerpc/powerpc32/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/powerpc/powerpc64/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/s390/s390-32/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/s390/s390-64/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/sh/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/sparc/crti.S (_init): Mark as hidden. (_fini): Likewise. * sysdeps/x86_64/crti.S (_init): Mark as hidden. (_fini): Likewise.
163 lines
4.1 KiB
ArmAsm
163 lines
4.1 KiB
ArmAsm
/* Special .init and .fini section support for IA64.
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Copyright (C) 2000-2018 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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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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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, see
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<http://www.gnu.org/licenses/>. */
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/* crti.S puts a function prologue at the beginning of the .init and
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.fini sections and defines global symbols for those addresses, so
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they can be called as functions. The symbols _init and _fini are
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magic and cause the linker to emit DT_INIT and DT_FINI. */
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#include <libc-symbols.h>
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#include <sysdep.h>
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#undef ret
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#ifndef PREINIT_FUNCTION
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# define PREINIT_FUNCTION __gmon_start__
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#endif
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#ifndef PREINIT_FUNCTION_WEAK
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# define PREINIT_FUNCTION_WEAK 1
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#endif
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#if PREINIT_FUNCTION_WEAK
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weak_extern (PREINIT_FUNCTION)
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#else
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.hidden PREINIT_FUNCTION
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#endif
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/* If we have working .init_array support, we want to keep the .init
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section empty (apart from the mandatory prologue/epilogue. This
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ensures that the default unwind conventions (return-pointer in b0,
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frame state in ar.pfs, etc.) will do the Right Thing. To ensure
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an empty .init section, we register gmon_initializer() via the
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.init_array.
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--davidm 02/10/29 */
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#if PREINIT_FUNCTION_WEAK
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/* This blob of assembly code is one simple C function:
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static void
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__attribute__ ((used))
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gmon_initializer (void)
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{
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extern void weak_function __gmon_start__ (void);
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if (__gmon_start__)
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(*__gmon_start__)();
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}
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*/
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.text
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.align 64
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.proc gmon_initializer#
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gmon_initializer:
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.prologue 12, 32
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.mmi
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.save ar.pfs, r33
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alloc r33 = ar.pfs, 0, 3, 0, 0
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addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp
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.save rp, r32
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mov r32 = b0
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.mmi
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mov r34 = r1
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.body
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;;
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ld8 r14 = [r14]
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nop 0
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;;
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.mib
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cmp.eq p6, p7 = 0, r14
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nop 0
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(p6) br.cond.spnt .L1
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;;
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.mib
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nop 0
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nop 0
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br.call.sptk.many b0 = PREINIT_FUNCTION#
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;;
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.mmi
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mov r1 = r34
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nop 0
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nop 0
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.L1:
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.mii
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nop 0
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mov ar.pfs = r33
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nop 0
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;;
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.mib
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nop 0
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mov b0 = r32
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br.ret.sptk.many b0
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.endp gmon_initializer#
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# undef PREINIT_FUNCTION
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# define PREINIT_FUNCTION gmon_initializer
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#endif
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.section .init_array, "aw"
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data8 @fptr(PREINIT_FUNCTION)
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.section .init,"ax",@progbits
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.global _init#
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.hidden _init#
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.proc _init#
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_init:
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.prologue
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.save ar.pfs, r34
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alloc r34 = ar.pfs, 0, 3, 0, 0
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.vframe r32
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mov r32 = r12
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.save rp, r33
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mov r33 = b0
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.body
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adds r12 = -16, r12
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;; /* see gmon_initializer() above */
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.endp _init#
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.section .fini,"ax",@progbits
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.global _fini#
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.hidden _fini#
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.proc _fini#
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_fini:
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.prologue
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.save ar.pfs, r34
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alloc r34 = ar.pfs, 0, 3, 0, 0
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.vframe r32
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mov r32 = r12
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.save rp, r33
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mov r33 = b0
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.body
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adds r12 = -16, r12
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;;
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.endp _fini#
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