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92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
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/* Call ctors and dtors from elinux a.out shared libraries.
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Copyright (C) 1999, 2000, 2003, 2004, 2005 Axis Communications.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Neither the name of Axis Communications nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY AXIS COMMUNICATIONS AND ITS CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AXIS
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COMMUNICATIONS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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typedef void (*vfnp) (void);
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/* The guts of the _Libctors and _Libdtors is "optimized" away into
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empty functions when the definition is visible as well. Simplest
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solution is to emit the definitions as asm. We have no .previous
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directive in a.out, so we rely on the fact that everything in this
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file goes into the .text section. */
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__asm__
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(
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".text\n\t.global .$global.lib.ctors\n.$global.lib.ctors:\n\t.dword 0"
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);
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__asm__
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(
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".text\n\t.global .$global.lib.dtors\n.$global.lib.dtors:\n\t.dword 0"
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);
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extern vfnp * const _Ctors asm(".$global.lib.ctors");
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extern vfnp * const _Dtors asm(".$global.lib.dtors");
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/* We better provide weak empty ctor and dtor lists, since they are
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not created if the main program does not have ctor/dtors. Because
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it's otherwise not used, GCC trunk "Mon Jul 25 22:33:14 UTC 2005"
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thinks it can remove defaultors, so we need to artificially mark it
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as used. FIXME: Perhaps a GCC bug. */
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static vfnp const defaultors[] __attribute__ ((__used__)) = {0, 0};
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extern vfnp * __CTOR_LIST__ __attribute__ ((weak, alias ("defaultors")));
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extern vfnp * __DTOR_LIST__ __attribute__ ((weak, alias ("defaultors")));
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void
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_Libctors (void)
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{
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const vfnp *firstor = _Ctors;
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const vfnp *ctors;
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/* Have to find the last ctor; they will run in opposite order as in
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the table. */
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if (firstor != 0 && *firstor != 0)
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{
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for (ctors = firstor; *ctors != 0; ctors++)
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;
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while (--ctors != firstor)
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{
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(**ctors)();
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}
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(**ctors)();
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}
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}
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void
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_Libdtors(void)
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{
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const vfnp *dtors = _Dtors;
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if (dtors)
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while (*dtors != 0)
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{
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(**dtors++) ();
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}
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}
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