[SPARC64]: Add irqtrace/stacktrace/lockdep support.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index 3522cd66f3bb..079d18a11d24 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -165,14 +165,26 @@ rtrap:
 __handle_softirq_continue:
 rtrap_xcall:
                 sethi                   %hi(0xf << 20), %l4
-                andcc                   %l1, TSTATE_PRIV, %l3
                 and                     %l1, %l4, %l4
+                andn                    %l1, %l4, %l1
+                srl                     %l4, 20, %l4
+#ifdef CONFIG_TRACE_IRQFLAGS
+                brnz,pn                 %l4, rtrap_no_irq_enable
+                 nop
+                call                    trace_hardirqs_on
+                 nop
+                wrpr                    %l4, %pil
+rtrap_no_irq_enable:
+#endif
+                andcc                   %l1, TSTATE_PRIV, %l3
                 bne,pn                  %icc, to_kernel
-                 andn                   %l1, %l4, %l1
+                 nop
 
                 /* We must hold IRQs off and atomically test schedule+signal
                  * state, then hold them off all the way back to userspace.
-                 * If we are returning to kernel, none of this matters.
+                 * If we are returning to kernel, none of this matters.  Note
+                 * that we are disabling interrupts via PSTATE_IE, not using
+                 * %pil.
                  *
                  * If we do not do this, there is a window where we would do
                  * the tests, later the signal/resched event arrives but we do
@@ -256,7 +268,6 @@ rt_continue:	ldx			[%sp + PTREGS_OFF + PT_V9_G1], %g1
 
                 ld                      [%sp + PTREGS_OFF + PT_V9_Y], %o3
                 wr                      %o3, %g0, %y
-                srl                     %l4, 20, %l4
                 wrpr                    %l4, 0x0, %pil
                 wrpr                    %g0, 0x1, %tl
                 wrpr                    %l1, %g0, %tstate
@@ -374,8 +385,8 @@ to_kernel:
                  ldx                    [%g6 + TI_FLAGS], %l5
                 andcc                   %l5, _TIF_NEED_RESCHED, %g0
                 be,pt                   %xcc, kern_fpucheck
-                 srl                    %l4, 20, %l5
-                cmp                     %l5, 0
+                 nop
+                cmp                     %l4, 0
                 bne,pn                  %xcc, kern_fpucheck
                  sethi                  %hi(PREEMPT_ACTIVE), %l6
                 stw                     %l6, [%g6 + TI_PRE_COUNT]