eden-emu/eden - eden - InfoTonic

Lioncash 7fe27de26e svc: Use the current process' handle table for retrieving the process instance to act upon The kernel uses the handle table of the current process to retrieve the process that should be used to retrieve certain information. To someone not familiar with the kernel, this might raise the question of "Ok, sounds nice, but doesn't this make it impossible to retrieve information about the current process?". No, it doesn't, because HandleTable instances in the kernel have the notion of a "pseudo-handle", where certain values allow the kernel to lookup objects outside of a given handle table. Currently, there's only a pseudo-handle for the current process (0xFFFF8001) and a pseudo-handle for the current thread (0xFFFF8000), so to retrieve the current process, one would just pass 0xFFFF8001 into svcGetInfo. The lookup itself in the handle table would be something like: template <typename T> T* Lookup(Handle handle) { if (handle == PSEUDO_HANDLE_CURRENT_PROCESS) { return CurrentProcess(); } if (handle == PSUEDO_HANDLE_CURRENT_THREAD) { return CurrentThread(); } return static_cast<T*>(&objects[handle]); } which, as is shown, allows accessing the current process or current thread, even if those two objects aren't actually within the HandleTable instance.	8 years ago
..
inih@603729dec8	Added configuration file system.	12 years ago
CMakeLists.txt	CMakeLists: Derive the source directory grouping from targets themselves	8 years ago

Lioncash 7fe27de26e svc: Use the current process' handle table for retrieving the process instance to act upon

The kernel uses the handle table of the current process to retrieve the
process that should be used to retrieve certain information. To someone
not familiar with the kernel, this might raise the question of "Ok,
sounds nice, but doesn't this make it impossible to retrieve information
about the current process?".

No, it doesn't, because HandleTable instances in the kernel have the
notion of a "pseudo-handle", where certain values allow the kernel to
lookup objects outside of a given handle table. Currently, there's only
a pseudo-handle for the current process (0xFFFF8001) and a pseudo-handle
for the current thread (0xFFFF8000), so to retrieve the current process,
one would just pass 0xFFFF8001 into svcGetInfo.

The lookup itself in the handle table would be something like:

template <typename T>
T* Lookup(Handle handle) {
    if (handle == PSEUDO_HANDLE_CURRENT_PROCESS) {
        return CurrentProcess();
    }

    if (handle == PSUEDO_HANDLE_CURRENT_THREAD) {
        return CurrentThread();
    }

    return static_cast<T*>(&objects[handle]);
}

which, as is shown, allows accessing the current process or current
thread, even if those two objects aren't actually within the HandleTable
instance.

8 years ago

inih@603729dec8

Added configuration file system.

12 years ago

CMakeLists.txt

CMakeLists: Derive the source directory grouping from targets themselves

8 years ago