Hi - Question #1 I was looking at the code of resume() at swtch.s. The %g7 resister seems to hold a pointer to the thread structure. Is that pointer to the user-level one or the kernel-level one? I have this question because of my following confussion; if %g7 holds a pointer to the kernel thread then somehow it needs to be not available to user-mode since this will violate process/kernel boundaries. On the other hand if it points to user-level structure, then it is not reasonable since that structure could be modified by user-mode. Clearly I am missing something here. I know that in SPARC there is this alternate global set. Does the kernel use that alternate global? Or does the kernel clear the %g7 register before getting to user mode? If this is the case, could someone point me to the place where this happen?
Question #2 Do changes of %g7 always indicate a thread context switch? thanks, -Haris This message posted from opensolaris.org _______________________________________________ opensolaris-code mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/opensolaris-code
