In set_regs(), flush the dirty registers onto the backingstore before

we update the registers. That way we don't have any dirty registers to
worry about and also know that bsp=bspstore, which makes updating the
RSE related registers predictable.
This is not the end of it. We need more validity checks, but for now
this allows us to complete the gdb testsuite without crashing the
kernel.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c
index 45cd022..2925385 100644
--- a/sys/ia64/ia64/machdep.c
+++ b/sys/ia64/ia64/machdep.c
@@ -1305,7 +1305,10 @@ set_regs(struct thread *td, struct reg *regs)
 	struct trapframe *tf;
 
 	tf = td->td_frame;
+	ia64_flush_dirty(td, &tf->tf_special);
 	tf->tf_special = regs->r_special;
+	tf->tf_special.bspstore += tf->tf_special.ndirty;
+	tf->tf_special.ndirty = 0;
 	tf->tf_scratch = regs->r_scratch;
 	restore_callee_saved(&regs->r_preserved);
 	return (0);