* Different ways of doing a system call
@ 2016-07-17 15:14 Aleksander Alekseev
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From: Aleksander Alekseev @ 2016-07-17 15:14 UTC (permalink / raw)
To: kernelnewbies
Hello
Recently I've explored different ways of doing a system call on Linux
(only on x86 and x64 architectures). Here is what I discovered so far:
* int 0x80 (x86, slow)
* sysenter (x86, fast)
* vsyscall (x86, deprecated)
* VDSO trampoline (x86, fast)
* syscall (x64, fast)
Tell me, please:
* Didn't I miss anything?
* What are _recommended_ ways of doing a system call on x86 and x64?
* I just wanted to clarify - in theory it's OK to use both say int 0x80
and syscall in the same ELF64 binary? Wouldn't it cause a program to
crash or something?
--
Best regards,
Aleksander Alekseev
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