Hi! I've some problems with qemu-system-sparc and programs using floating point instructions. Each time at least two floating point programs are started in qemu simultaneously, one or both are killed by the linux kernel with a SIGSEV signal (sometimes because of a corrupted stack or invalid register values). If I start only one program no error occurs. It looks like it has something to do with the disabled-floating-point-unit-trap, which is executed each time a process tries to access the fpu while another process has used it before. This interrupt calls the linux function do_fpd_trap which then saves the old FPU-state and restores the new one. When only one program uses the FPU this trap is never executed.
I've checked a lot of the executed instructions in qemu and cannot find any problems up to now. Does somebody else has an idea what to check? The test program simply adds two float variables (fadds-instruction) in a loop and this crashes the program reproducible. regards, Jörg _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
