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