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/* In a deft move of uber-hackery, we decide to carry the top half of all
 * 64-bit registers in a non-portable, non-ABI, hidden structure.
 * Userspace can read the hidden structure if it *wants* but is never
 * guaranteed to be in the same place. Infact the uc_sigmask from the 
 * ucontext_t structure may push the hidden register file downards
struct compat_regfile {
      /* Upper half of all the 64-bit registers that were truncated
         on a copy to a 32-bit userspace */
      compat_int_t rf_gr[32];
      compat_int_t rf_iasq[2];
      compat_int_t rf_iaoq[2];
      compat_int_t rf_sar;


struct compat_rt_sigframe {
      /* XXX: Must match trampoline size in arch/parisc/kernel/signal.c 
              Secondary to that it must protect the ERESTART_RESTARTBLOCK
            trampoline we left on the stack (we were bad and didn't 
            change sp so we could run really fast.) */
      compat_uint_t tramp[COMPAT_TRAMP_SIZE];
      compat_siginfo_t info;
      struct compat_ucontext uc;
      /* Hidden location of truncated registers, *must* be last. */
      struct compat_regfile regs; 

 * The 32-bit ABI wants at least 48 bytes for a function call frame:
 * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
 * which Linux/parisc uses is sp-20 for the saved return pointer...)
 * Then, the stack pointer must be rounded to a cache line (64 bytes).
#define SIGFRAME32            64
#define PARISC_RT_SIGFRAME_SIZE32                           \
      (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)


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