Blackfin: handle anomaly 05000257

Need to reload the loop counters to keep from corrupting hardware loops.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/cpu/blackfin/interrupt.S b/cpu/blackfin/interrupt.S
index 71e0fc67088fb4323628ad0f1bca41fe7f59ecac..8c7a262892223a85a0c925f5595d9001aee2fb15 100644 (file)
--- a/cpu/blackfin/interrupt.S
+++ b/cpu/blackfin/interrupt.S
@@ -1,7 +1,7 @@
 /*
  * interrupt.S - trampoline default exceptions/interrupts to C handlers
  *
- * Copyright (c) 2005-2007 Analog Devices Inc.
+ * Copyright (c) 2005-2009 Analog Devices Inc.
  * Licensed under the GPL-2 or later.
  */
 
@@ -17,10 +17,19 @@ ENTRY(_trap)
        sp.l = LO(L1_SRAM_SCRATCH_END - 20);
        sp.h = HI(L1_SRAM_SCRATCH_END - 20);
        SAVE_ALL_SYS
+
        r0 = sp;        /* stack frame pt_regs pointer argument ==> r0 */
        sp += -12;
        call _trap_c;
        sp += 12;
+
+#if ANOMALY_05000257
+       R7  = LC0;
+       LC0 = R7;
+       R7  = LC1;
+       LC1 = R7;
+#endif
+
        RESTORE_ALL_SYS
        sp = CONFIG_BFIN_SCRATCH_REG;
        rtx;