On Mon, Mar 03, 2003 at 06:14:20PM -0600, Steven J. Hill wrote: > The first thing I tried to fix this issue was to use the > 'memcpy.S' file from 2.4.7 and that actually worked, but > that was a step backwards. It was much simpler to just > add a 'nop' after the offending branch instruction. It > fixes all of my problems with 'copy_from_user'. Adding 'nop' seems to be right. > I do have one further question. In 'arch/mips/mm/fault.c' > when we need to do a fixup: > > fixup = search_exception_table(regs->cp0_epc); > > Why do we not check to see if the EPC is a branch insn > before looking in the exception table? > You must be looking at a different tree. We do check epc for branch instruction: fixup = search_exception_table(exception_epc(regs)); Jun
