commit 80f31c8a03d2f0644d0ceaf14e7e0108a007c962
author Mike Frysinger <vapier.adi@gmail.com> Sat Feb 02 15:47:24 2008 +0800
committer Bryan Wu <bryan.wu@analog.com> Sat Feb 02 15:47:24 2008 +0800
tree 71af89f61a1e9f969b9d24977e97ed5982f98237
parent a3acf52885a2312efb30a043062ef88dc3813082

[Blackfin] arch: change the trace buffer control start/stop logic in the exception handlers

To save/restore the trace buffer control so that if we take an exception
after turning off the trace buffer at a higher level we dont inadvertently
turn the trace buffer back on

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

include/asm-blackfin/trace.h

diff --git a/include/asm-blackfin/trace.h b/include/asm-blackfin/trace.h
index 6313aac..ef18afb 100644
--- a/include/asm-blackfin/trace.h
+++ b/include/asm-blackfin/trace.h
@@ -46,42 +46,47 @@
 
 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 
-#define TRACE_BUFFER_START(preg, dreg) trace_buffer_start(preg, dreg)
-#define TRACE_BUFFER_STOP(preg, dreg)  trace_buffer_stop(preg, dreg)
-
 #define trace_buffer_stop(preg, dreg)	\
 	preg.L = LO(TBUFCTL);		\
 	preg.H = HI(TBUFCTL);		\
 	dreg = 0x1;			\
 	[preg] = dreg;
 
-#define trace_buffer_start(preg, dreg)	\
-	preg.L = LO(TBUFCTL);		\
-	preg.H = HI(TBUFCTL);		\
-	dreg = BFIN_TRACE_ON;		\
-	[preg] = dreg;
-
 #define trace_buffer_init(preg, dreg) \
 	preg.L = LO(TBUFCTL);         \
 	preg.H = HI(TBUFCTL);         \
 	dreg = BFIN_TRACE_INIT;       \
 	[preg] = dreg;
 
+#define trace_buffer_save(preg, dreg) \
+	preg.L = LO(TBUFCTL); \
+	preg.H = HI(TBUFCTL); \
+	dreg = [preg]; \
+	[sp++] = dreg; \
+	dreg = 0x1; \
+	[preg] = dreg;
+
+#define trace_buffer_restore(preg, dreg) \
+	preg.L = LO(TBUFCTL); \
+	preg.H = HI(TBUFCTL); \
+	dreg = [sp--]; \
+	[preg] = dreg;
+
 #else /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
 
 #define trace_buffer_stop(preg, dreg)
-#define trace_buffer_start(preg, dreg)
 #define trace_buffer_init(preg, dreg)
+#define trace_buffer_save(preg, dreg)
+#define trace_buffer_restore(preg, dreg)
 
 #endif /* CONFIG_DEBUG_BFIN_HWTRACE_ON */
 
 #ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
-# define DEBUG_START_HWTRACE(preg, dreg) trace_buffer_start(preg, dreg)
-# define DEBUG_STOP_HWTRACE(preg, dreg) trace_buffer_stop(preg, dreg)
-
+# define DEBUG_HWTRACE_SAVE(preg, dreg)    trace_buffer_save(preg, dreg)
+# define DEBUG_HWTRACE_RESTORE(preg, dreg) trace_buffer_restore(preg, dreg)
 #else
-# define DEBUG_START_HWTRACE(preg, dreg)
-# define DEBUG_STOP_HWTRACE(preg, dreg)
+# define DEBUG_HWTRACE_SAVE(preg, dreg)
+# define DEBUG_HWTRACE_RESTORE(preg, dreg)
 #endif
 
 #endif /* __ASSEMBLY__ */