Re: [Qemu-devel] Which functions writes to memory?

[Jun Koi]

2010/4/16 malc <address@hidden>:
> On Fri, 16 Apr 2010, Jun Koi wrote:
>
>> On Fri, Apr 16, 2010 at 3:17 PM, malc <address@hidden> wrote:
>> > On Fri, 16 Apr 2010, Jun Koi wrote:
>> >
>> >> Hi,
>> >>
>> >> I am writing a small tool to trace all the activities that write to an
>> >> area of (virtual) memory in Qemu.
>> >> I am currently doing that by putting my code at the top of the below
>> >> macro in softmmu_header.h
>> >>
>> >> static inline void glue(glue(st, SUFFIX), MEMSUFFIX)....
>> >>
>> >> However, it seems I still miss some written events: in some occasions,
>> >> I believe that Qemu has another code writing data to memory, which
>> >> happens even before this macro.
>> >> Is it true that elsewhere, Qemu also writes into memory besides using
>> >> above function?
>> >>
>> >> The memory area I am tracking for written events belong to normal area
>> >> in OS kernel, where usually only normal code (kernel, not something
>> >> like SMM handler)  write to.
>> >
>> > Once the TLB is properly set up st helpers are bypassed entirely and
>> > tcg generated code writes to it directly, it's quite easy to "workaround"
>> > that at the expense of much slower execution.
>> >
>>
>> This saves me a lot of frustrated time, thanks!
>>
>> Now I can see that tcg code calls to __stb*_mmu(), but cannot find any
>> code call to st*_mmu().
>> Do you have any hint?
>
> The tcg generated code fetches appropriate helper's address from the
> qemu_st/ld_helpers array and calls it indirectly.

Sorry if that was not clear, but my question is: which code called
st*mmu() macros (in softmmu_header.h)

I searched around everywhere, but dont see which calls these macros.

Thanks,
J