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-rw-r--r--arch/blackfin/mach-common/entry.S50
1 files changed, 38 insertions, 12 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 038f70e..eceb484 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -158,23 +158,45 @@ ENTRY(_ex_single_step)
cc = r7 == r6;
if cc jump _bfin_return_from_exception;
+ /* Don't do single step in hardware exception handler */
+ p5.l = lo(IPEND);
+ p5.h = hi(IPEND);
+ r6 = [p5];
+ cc = bittst(r6, 5);
+ if cc jump _bfin_return_from_exception;
+
+#ifdef CONFIG_KGDB
+ /* skip single step if current interrupt priority is higher than
+ * that of the first instruction, from which gdb starts single step */
+ r6 >>= 6;
+ r7 = 10;
+.Lfind_priority_start:
+ cc = bittst(r6, 0);
+ if cc jump .Lfind_priority_done;
+ r6 >>= 1;
+ r7 += -1;
+ cc = r7 == 0;
+ if cc jump .Lfind_priority_done;
+ jump.s .Lfind_priority_start;
+.Lfind_priority_done:
+ p4.l = _debugger_step;
+ p4.h = _debugger_step;
+ r6 = [p4];
+ cc = r6 == 0;
+ if cc jump .Ldo_single_step;
+ r6 += -1;
+ cc = r6 < r7;
+ if cc jump _bfin_return_from_exception;
+.Ldo_single_step:
+#endif
+
/* If we were in user mode, do the single step normally. */
- p5.l = lo(IPEND);
- p5.h = hi(IPEND);
r6 = [p5];
r7 = 0xffe0 (z);
r7 = r7 & r6;
cc = r7 == 0;
- if !cc jump 1f;
-
- /* Single stepping only a single instruction, so clear the trace
- * bit here. */
- r7 = syscfg;
- bitclr (r7, 0);
- syscfg = R7;
- jump _ex_trap_c;
+ if cc jump 1f;
-1:
/*
* We were in an interrupt handler. By convention, all of them save
* SYSCFG with their first instruction, so by checking whether our
@@ -202,11 +224,15 @@ ENTRY(_ex_single_step)
cc = R7 == R6;
if !cc jump _bfin_return_from_exception;
+1:
+ /* Single stepping only a single instruction, so clear the trace
+ * bit here. */
r7 = syscfg;
bitclr (r7, 0);
syscfg = R7;
- /* Fall through to _bfin_return_from_exception. */
+ jump _ex_trap_c;
+
ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception)
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