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There are four kinds of signal frames on MIPS/Linux that we have to recognize: - o32 sigreturn - o32 rt_sigreturn - n32 rt_sigreturn - n64 rt_sigreturn
They're all basically the same but the offsets differ. Kind could be moved out of the cache, I think, since it isn't used after the cache is filled. So I could use your new mechanism after all.
What would _really_ be nice would be a way to pass the kind from the sniffer (which really just calls PC_IN_SIGTRAMP) to the frame creation code... not have to read inferior memory to figure out which it is, twice.
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