On Tue, Nov 09, 2004 at 06:31:11PM +0530, mansoor wrote: > Iam working on lx4189. This core doesnt support > "lwc0" instruction but my tool chain generates > this instruction. > > So when I run some applications it throws > "unknown instruction" exception. > > How can solve this issue ? > > I have few solutions but I dont know > whether its correct. > > > 1) Re-build the toolchain with this instruction > disbaled. But how to do this ?. > 2) Write an exception handler to handle this > instruction. The exact replacement would be > "mfc0". how to do this ? No. lwc0 is ll, load linked. In 2.6 define cpu_has_llsc to return 0 in your system's cpu-feature-override.h. In 2.4 disable CONFIG_CPU_HAS_LLSC. The kernel actually has an emulation for ll/sc in applications which enables running of application code using ll/sc on ll/sc-less processors. You should try to find why this seems to fail for you. Maybe this Lexra kernel is simply super-ancient? If it's as old as it seems you should replace it as it has various exploitable security holes. Ralf
