[Qemu-devel] Question about Linux user space emulation

[Laurent DESNOGUES]

I have what may be a stupid question.

In syscall.c, for syscall TARGET_NR_sigprocmask, the code reads
as:

>   sigset_t set, oldset, *set_ptr;
>   target_ulong *pset = (void *)arg2, *poldset = (void *)arg3;
>   if (pset) {
>     ...
>     target_to_host_old_sigset(&set, pset);
>   }

and

>   void target_to_host_old_sigset(sigset_t *sigset,
>                                  const target_ulong *old_sigset)
>   {
>     target_sigset_t d;
>     int i;
>
>     d.sig[0] = *old_sigset;

This translates to:

> d.sig[0] = *arg2;

Where arg2 is coming from the target.

How can this work without translating the arg2 contents to host
address space?


Laurent



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