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
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
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, and
