Hi, Xin, Try Max's patch http://lists.gnu.org/archive/html/qemu-devel/2012-08/msg03226.html
I used it to get all the guest virtual address because this patch disable the fast mmu path. Steven On Thu, Aug 23, 2012 at 12:18 PM, Xin Tong <xerox.time.t...@gmail.com> wrote: > On Thu, Aug 23, 2012 at 8:52 AM, Peter Maydell <peter.mayd...@linaro.org> > wrote: >> On 23 August 2012 16:34, Xin Tong <xerox.time.t...@gmail.com> wrote: >>> I am emulating arm on x86. i want to track the virt and physical >>> address of last memory operation. so i put 2 fields in the CPUState >>> and make tcg_global_mem_new_i32 on them Therefore, before every >>> translation i generate code to save the virtual address as follow: >>> >>> static inline void gen_st32(TCGv val, TCGv addr, int index) >>> { >>> tcg_gen_mov_i32(cpu_last_vaddr, addr); >>> tcg_gen_qemu_st32(val, addr, index); >>> // tcg_gen_mov_i32(cpu_last_paddr, addr); >>> tcg_temp_free_i32(val); >>> } >>> >>> But i do not know how to save the physical, as the physical address is >>> never passed out of tcg_gen_qemu_st32. what would be the best way to >>> get the physical address here ? i want to pass it out by the "TCGv >>> addr here" but it did not work ... >> >> This is quite difficult because our fast-path code doesn't actually >> deal with the guest physical address at all: we create a TLB which >> maps directly from guest virtual address to host virtual address >> and use that most of the time. >> >> In general you are running into the problem that QEMU is designed >> to run code fast, not to be easy to instrument. > > 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 ? > > Xin > >> >> -- PMM >