StackWalk64: Don't know how to fill-in the STACKFRAME64 variable for WinRT processor

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Windows

WinRT

Win8

Hi,

I am currently using StackWalk64 to get stack on win 8 and winRT(ARM processor).
It is working fine on win 8, but I don't know how to fill-in the variable with the structure STACKFRAME64 in order to make StackWalk64 working on WinRT.

I am using the following piece of code, and I am trying to fill-in the section _M_ARM

#ifdef _M_IX86
    *machineType         = IMAGE_FILE_MACHINE_I386;
    s->AddrPC.Offset     = context.Eip;
    s->AddrPC.Mode       = AddrModeFlat;
    s->AddrStack.Offset  = context.Esp;
    s->AddrStack.Mode    = AddrModeFlat;
    s->AddrFrame.Offset  = context.Ebp;
    s->AddrFrame.Mode    = AddrModeFlat;
#elif  _M_X64
    *machineType         = IMAGE_FILE_MACHINE_AMD64;
    s->AddrPC.Offset     = context.Rip;
    s->AddrPC.Mode       = AddrModeFlat;
    s->AddrStack.Offset  = context.Rsp;
    s->AddrStack.Mode    = AddrModeFlat;
    s->AddrFrame.Offset  = context.Rbp;
    s->AddrFrame.Mode    = AddrModeFlat;
#elif _M_IA64
    *machineType         = IMAGE_FILE_MACHINE_IA64;
    s->AddrPC.Offset     = context.StIIP;
    s->AddrPC.Mode       = AddrModeFlat;
    s->AddrStack.Offset  = context.IntSp;
    s->AddrStack.Mode    = AddrModeFlat;
    s->AddrFrame.Offset  = context.IntSp;
    s->AddrFrame.Mode    = AddrModeFlat;
    s->AddrBStore.Offset = context.RsBSP;
    s->AddrBStore.Mode   = AddrModeFlat;
#elif _M_ARM

#else
    return -1;
#endif
    return  0;

Could you help me please?
Thanks for your help