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ia64 has some strangenesses that need to be workaround: - it has a __clone2() syscall instead of the using clone() one, with different arguments, and which is not declared in the usual headers. - ucontext.uc_sigmask is declared with type long int, while it is actually of type sigset_t. - uc_mcontext, uc_sigmask, uc_stack, uc_link are declared using #define, which clashes with the target_ucontext fields. Change their names to tuc_*, as already done for some target architectures.
Read the documentation in qemu-doc.html. Fabrice Bellard.