The function sys_or1k_atomic was using call-saved registers without
restoring their value before returning. This is a faux pas: either
we need to restore their values or use scratch regs; the latter is
less code so that's the route this patch takes.
Thanks to David Hennerström for doing most of the heavy-lifting in
tracking this one down.
Reported-by: Davd Hennerström <david.hennerstrom@aacmicrotec.com>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
ENTRY(sys_or1k_atomic)
/* FIXME: This ignores r3 and always does an XCHG */
DISABLE_INTERRUPTS(r17,r19)
- l.lwz r30,0(r4)
- l.lwz r28,0(r5)
- l.sw 0(r4),r28
- l.sw 0(r5),r30
+ l.lwz r29,0(r4)
+ l.lwz r27,0(r5)
+ l.sw 0(r4),r27
+ l.sw 0(r5),r29
ENABLE_INTERRUPTS(r17)
l.jr r9
l.or r11,r0,r0