diff options
| -rw-r--r-- | sys/powerpc/aim/swtch.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/powerpc/aim/swtch.S b/sys/powerpc/aim/swtch.S index 672fe6b..619bf89 100644 --- a/sys/powerpc/aim/swtch.S +++ b/sys/powerpc/aim/swtch.S @@ -155,6 +155,12 @@ cpu_switchin: mtsr USER_SR,%r5 isync lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ + /* + * Perform a dummy stwcx. to clear any reservations we may have + * inherited from the previous thread. It doesn't matter if the + * stwcx succeeds or not. pcb_context[0] can be clobbered. + */ + stwcx. %r1, 0, %r3 blr /* |
