how to access syscall parameter data in uarea in DLKM of hpux 11iv3(IA64)？

[EricRen]

I replace open syscall with my function , in my function access original open syscall  parameters( scall_argp()). when I printf the first parameter string, the kernel happens crash !!!! Help me !!!!

[Laurent Menase]

looks like it tried to deref an address in a wrong space,

looks like you passed 32bit aapplication on stack address  to printf.

you should copyin the buffer to a kernel buffer before printing it I suppose

But this is pure crystalball guess, because without seeing either the code or the crash, difficult to tell.