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The logic is superficially similar to that of x86, but the small differences (no need for register table and dynamic allocation of register names, no $ sign before constants) make maintaining a common implementation too burdensome. Therefore simply add a s390x-specific version of parse_usdt_arg(). Note that while bcc supports index registers, this patch does not. This should not be a problem in most cases, since s390 uses a default value "nor" for STAP_SDT_ARG_CONSTRAINT. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220407214411.257260-4-iii@linux.ibm.com