http://bugs.winehq.org/show_bug.cgi?id=27929
--- Comment #5 from camillo.lugaresi+wine@gmail.com 2011-07-28 15:11:30 CDT --- (In reply to comment #4)
signal_init_process is called, and the disassembly looks right: it seems to be calling sigaction with the the correct pointer to segv_handler. However, segv_handler is not called when the signal is received. I'll keep investigating.
Actually, the signal handler is probably getting called, but gdb on OS X messes us the translation between mach exceptions (EXC_BAD_ACCESS in this case) and UNIX signals (SIGBUS), so it cannot be used to step into signal handlers.