Linus Torvalds wrote:
>
> Uli's suggested glibc approach is to just put the magis system call
> address (which glibc gets from the AT_SYSINFO elf aux table entry) into
> the per-thread TLS area, which is alway spointed to by %gs anyway.
>
> THIS WORKS WITH ALL DSO'S WITHOUT ANY GAMES, ANY MMAP'S, ANY RELINKING, OR
> ANY EXTRA WORK AT ALL!
>
> The system call entry becomes a simple
>
> call *%gs:constant-offset
>
> Not mmap. No magic system calls. No relinking. Not _nothing_. One
> instruction, that's it.
>
Unfortunately it means taking an indirect call cost for every invocation...
-hpa
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This archive was generated by hypermail 2b29 : Mon Dec 23 2002 - 22:00:24 EST