On Thu, Feb 09, 2006 at 05:08:59PM -0500, Young Koh wrote:
> I have a question about system call implementation in tt mode. it
> seems that an invoked system call will be executed in tracee's
> context. (the tracer sends SIGUSR2 to the tracee and tracee executes
> the system call in usr2_handler) however, 'current' macro, which is
> used to find the current task structure, would only work in Kernel
> mode stack (which i assume is the tracer's stack), cause the current
> task structure is at the bottom of the kernel stack. then, how the
> system calls can be executed in tracee's context?
The SIGUSR2 on the process kernel stack, in the UML kernel, due to the
kernel stack being registered as the signal stack for SIGUSR2.
Jeff
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