Michael Shmulevich wrote: > Carsten Langgaard wrote: > > > I have a few questions about user applications. > > > > When a new user process is started will its user space be cleared by the > > kernel or is there a potential leak from an older user process ? > > Usually it is defied by the loader. If the data section contents is set to > LOAD, then the contents of the section will be loaded from disk (no leak), > if not -- whatever values left i nmemory will be there, or exactly, the > virtual page of some other proccess that was swapped out or ended. > > > What about the registers values, are they cleared for each new user > > application or will it simply contain the current value it got when the > > user application is started ? > > It depends on the context switch algorithm of the processor, I think. > > > How can you flush the data and instruction cashes from a user > > application ? > > > > As far as I understand, ASID must take care of it. It contains unique IDs > per process virtual space, so that even > though virtual addresses may be found in TLB, their ASID will be different, > causing TLB miss and probably page fault. > My problem is that I want to make self-modified code, so I need to flush both the instruction and data cache. > > > > > /Carsten > > > > -- > > _ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com > > |\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527 > > | \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555 > > TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556 > > Denmark http://www.mips.com > > Michael. -- _ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com |\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527 | \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555 TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556 Denmark http://www.mips.com
