I get a segfault with following app - could you verify this? platform: i386, linux gcc -v: COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6.1/lto-wrapper Ziel: i686-linux-gnu Konfiguriert mit: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.1-9ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu Thread-Modell: posix gcc-Version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) /lib/i386-linux-gnu/libc-2.13.so GNU C Library (Ubuntu EGLIBC 2.13-20ubuntu5.1) stable release version 2.13, by Roland McGrath et al. Copyright (C) 2011 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Compiled by GNU CC version 4.6.1. Compiled on a Linux 3.0.17 system on 2012-03-07. Available extensions: crypt add-on version 2.1 by Michael Glad and others GNU Libidn by Simon Josefsson Native POSIX Threads Library by Ulrich Drepper et al BIND-8.2.3-T5B libc ABIs: UNIQUE IFUNC For bug reporting instructions, please see: <http://www.debian.org/Bugs/>. #include <assert.h> #include <stdint.h> #include <stdio.h> #include <ucontext.h> #include <unwind.h> #include <cstdlib> #include <cstring> #include <iostream> #include <vector> static int counter = 0; static ucontext_t ucf, ucm; struct X { X() { std::cout << "X()" << std::endl; } ~X() { std::cout << "~X()" << std::endl; } }; _Unwind_Reason_Code stop( int version, _Unwind_Action actions, _Unwind_Exception_Class exc_class, _Unwind_Exception *exc, _Unwind_Context *context, void * param) { // std::cout << "counter == " << ++counter << std::endl; if ( actions & _UA_END_OF_STACK) { std::cout << "end of stack, jump back" << std::endl; _Unwind_DeleteException( exc); if ( ::swapcontext( & ucf, & ucm) == -1) ::abort(); } return _URC_NO_REASON; } void force_unwind() { _Unwind_Exception * exc = new _Unwind_Exception; std::memset( exc, 0, sizeof( * exc) ); _Unwind_ForcedUnwind( exc, stop, 0); } void f( int i) { if ( i > 0) { X x; f( --i); } else { force_unwind(); std::cout << "fini" << std::endl; } } int main( int argc, char * argv[]) { std::vector< char > buffer(16384, '\0'); void * fn_stack = & buffer[0]; fprintf(stdout,"buffer : %p\n", fn_stack); fn_stack = ( char * )( ( ( ( ( uintptr_t) fn_stack) - 16) >> 4) << 4); fprintf(stdout,"aligned : %p\n", fn_stack); if ( ::getcontext( & ucf) == -1) ::abort(); ucf.uc_stack.ss_sp = fn_stack; ucf.uc_stack.ss_size = buffer.size(); ::makecontext( & ucf, (void(*)())( f), 1, 5); if ( ::swapcontext( & ucm, & ucf) == -1) ::abort(); std::cout << "done" << std::endl; return 0; } -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
