On Thu, Aug 23, 2012 at 7:57 PM, 陳韋任 (Wei-Ren Chen) <che...@iis.sinica.edu.tw> wrote: >> even that. is it possible to pass host virtual out. the fast path add >> the addend to get host virtual ? so it must be in a register, most >> likely eax in i386. what do you think would be the best way to get >> that out ? > > Take a look on comment on tcg_out_tlb_load (tcg/i386/tcg-target.c). > > First argument register is loaded with the low part of the address. > In the TLB hit case, it has been adjusted as indicated by the TLB > and so is a host address. In the TLB miss case, it continues to > hold a guest address. > > So I guess you can take "tcg_target_call_iarg_regs[0]" as host virtual > address if software tlb hit. > > /* TLB Hit. */ > tcg_out_qemu_ld_direct(s, data_reg, data_reg2, > tcg_target_call_iarg_regs[0], 0, opc); > > As for how do you get host virtual address out, I think you can write > a helper function logging those host virtual address into a file or > something else, then insert a helper function call at the point of > TLB hit. > > HTH, > chenwj > > -- > Wei-Ren Chen (陳韋任) > Computer Systems Lab, Institute of Information Science, > Academia Sinica, Taiwan (R.O.C.) > Tel:886-2-2788-3799 #1667 > Homepage: http://people.cs.nctu.edu.tw/~chenwj
That might be difficult. what i did was that i disabled inlined translated and push the virt/phys address into 2 new fields in the cpu structure in the call out lookup. because in the callout lookup we have a handle to the cpu env. not too sure how much impact inlined lookup has on the performance. since i disabled it, next step i would just get rid of that piece of generated assembly, as it is no good for icache ( generated for every memory operation). Xin