more random patches. who knows.

[patches.git] / hwtracebuffer.patch

Index: arch/blackfin/mach-common/entry.S
===================================================================
RCS file: /usr/local/src/blackfin/rsync/uclinux533/uClinux-dist/linux-2.6.x/arch/blackfin/mach-common/entry.S,v
retrieving revision 1.43
diff -u -p -r1.43 entry.S
--- arch/blackfin/mach-common/entry.S	31 Aug 2006 06:22:41 -0000	1.43
+++ arch/blackfin/mach-common/entry.S	2 Sep 2006 01:22:06 -0000
@@ -57,6 +57,29 @@
 #include <asm/thread_info.h>  /* TIF_NEED_RESCHED */
 #include <asm/asm-offsets.h>
 
+#ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
+	/*
+	 * TODO: this should be proper save/restore, but for now
+	 * we'll just cheat and use 0x1/0x13
+	 */
+# define DEBUG_START_HWTRACE \
+	P0.l = LO(TBUFCTL); \
+	P0.h = HI(TBUFCTL); \
+	R0 = [SP++]; \
+	[P0] = R0;
+# define DEBUG_STOP_HWTRACE \
+	P0.l = LO(TBUFCTL); \
+	P0.h = HI(TBUFCTL); \
+	R0 = [P0]; \
+	R1 = ~TBUFEN; \
+	[SP--] = R0; \
+	R2 = R0 & R1; \
+	[P0] = R2;
+#else
+# define DEBUG_START_HWTRACE
+# define DEBUG_STOP_HWTRACE
+#endif
+
 .data
 ALIGN
 _extable:
@@ -149,7 +172,9 @@ ENTRY(_ex_icplb)
 	(R7:6,P5:4) = [sp++];
 	ASTAT = [sp++];
 	SAVE_ALL_SYS
+	DEBUG_STOP_HWTRACE
 	call __cplb_hdr;
+	DEBUG_START_HWTRACE
 	RESTORE_ALL_SYS
 	SP = RETN;
 	rtx;