On Mon, 6 Jan 2003, Luca Barbieri wrote:
>
> 1. vfork seems to not set any TIF_ flags so a ptracer setting regs
> while a vforking task is stopped in ptrace_notify called from vfork
> would result in clobbered %ecx and %edx.
vfork and clone do not work at all with sysenter due to user stack issues.
We should document that (it's already de-facto documented in glibc, but it
should be explicitly documented somewhere).
Btw, the vfork/clone problems aren't sysenter-specific per se: they are
really a generic problem with any non-inlined system call mechanism. In
particular, vfork() really cannot afford to have a stack frame.
> 2. A ptracer could use %ecx or %edx to pass information to signal
> handlers and this would not work with the current [rt_]sigsuspend.
Yes. Although I don't see why it should matter, really.
Linus
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This archive was generated by hypermail 2b29 : Tue Jan 07 2003 - 22:00:32 EST