alt Hacker News> I just don’t see an advantage.
You don’t have to deal with C ABI requirements with respect to stack, or registers management. You also don’t need to do dynamic linking.
On the other hand all of that comes back to bone you if you’re trying to benefit from vDSO without going through a libc.
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LegionMammal978 • 11/07/2024
> On the other hand all of that comes back to bone you if you’re trying to benefit from vDSO without going through a libc.
At least the vDSO functions really don't need much in the way of stack space: generally there's nothing much there but clock_gettime() and gettimeofday(), which just read some values from the vvar area.
The bigger pain, of course, is actually looking up the symbols in the vDSO, which takes at least a minimal ELF parser.
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> You also don’t need to do dynamic linking.
This is a big one. Linking against libc on many platforms also means making your binaries relocatable. It's a lot of unnecessary, incidental complexity.