Marcus Meissner schrieb:
On Sun, Oct 23, 2005 at 08:33:40PM +0200, Peter Beutner wrote:
Hi I've been trying to get an older game(Heart Of Darkness) to work with wine. Appearently the game uses some kind of copy-protection(securom i suppose) which let wine abort with the following error: "Trace/breakpoint trap". After some debugging sessions I managed to reproduce the problem. See the attached program(debug.c, simply compile with mingw).
The problem is the following(as far as I understand it):
- app sets up an exception handler
- enables single-step debugging -> exception handler get invoked
- in the exception handler:- re-enables single-step debugging - modifies some debug register in the CONTEXT struct
-> because of that set_thread_context ist called and wineserver PTRACE_ATTACH to the process, modifies these registers, then resumes the process
- as wineserver doesn't detach from the process it will get the next SIGTRAP signal and
appearently it seems to ignore that signal
- [as nobody cares about the SIGTRAP signal the process get killed]
I'm not completly sure about the last step and the fact what wineserver really does with the SIGTRAP signal.
Do you use a AMD64 machine? At least mine has some troubles with ptrace on kernel 2.6.13 :/
yes, it is an amd64 with 64bit kernel and wine running in a 32bit chroot.
Ciao, Marcus