Maciej W. Rozycki <ma...@orcam.me.uk> 于2024年6月21日周五 08:41写道： > > On Fri, 21 Jun 2024, YunQiang Su wrote: > > > Linux and We use the code of conditional trap instructions to emit > > signals other than simple SIGTRAP. Currently, code 6 (overflow), > > 7 (div by zero) are supported. It means that if code 7 is used with > > a conditional trap instruction, a SIGFPE instead of SIGTRAP will emit. > > > > But when `gen_trap` we didn't pass the code as we use `generate_exception`, > > which has no info about the code. Let's introduce a new function > > `generate_exception_code` for it. > > I haven't touched this stuff for ages, but AFAICT the code is already > passed where applicable via the environment for `do_tr_or_bp' to handle, > so I can't understand why your change is needed. >
The error_code in env is always zero, as we need to set it here. > What problem are you trying to solve? > See the talk in GCC mailing list about testsuite/ubsan/overflow-div-3.c Qemu emits SIGTRAP instead of SIGFPE, due to it didn't initialize the code of conditional trap to env. > Maciej
