> No and no.
Good and good!
> On ppc32 there is a sys_debug_setcontext system call that is there to
> allow a process to debug itself. It does a setcontext and optionally
> sets the MSR_SE or MSR_BE bit. We don't have it on ppc64 for some
> reason (we should add it).
Wacky. I only looked in s
Roland McGrath writes:
> I'd like to clean this up for powerpc too. If there is no way at all for
> user-mode to set MSR_SE, then it doesn't much matter whether it shows up
> when ptrace reads it--ptrace just needs to ignore attempts to set it. So
> if there's no reason not to, what I would do i
Roland McGrath writes:
> Are there any powerpc instructions that can read or change the MSR
> explicitly from user mode? Any that can see or affect the MSR_SE bit?
No and no.
> e.g. x86 has pushf/popf unprivileged instructions, with which a user
> program can both see the single-step flag set,
Are there any powerpc instructions that can read or change the MSR
explicitly from user mode? Any that can see or affect the MSR_SE bit?
e.g. x86 has pushf/popf unprivileged instructions, with which a user
program can both see the single-step flag set, and enable single-step for
its own next inst
