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authorJie Zhang <jie.zhang@analog.com>2008-08-05 17:33:38 +0800
committerBryan Wu <cooloney@kernel.org>2008-08-05 17:33:38 +0800
commit5400c5aa2de41501be7529831c9df36c729bf371 (patch)
treebc2e0a6c0d8a88484b946e4989c07b27901a70d0
parent0f0625d895bc5b3c3d7352486a94e5a75f10fd35 (diff)
Blackfin arch: Fix bug - This change eliminates impact on application debugging
Signed-off-by: Jie Zhang <jie.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
-rw-r--r--arch/blackfin/mach-common/entry.S20
1 files changed, 13 insertions, 7 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index eceb484d90f..3db2f4df261 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -158,6 +158,7 @@ ENTRY(_ex_single_step)
cc = r7 == r6;
if cc jump _bfin_return_from_exception;
+#ifdef CONFIG_KGDB
/* Don't do single step in hardware exception handler */
p5.l = lo(IPEND);
p5.h = hi(IPEND);
@@ -165,7 +166,6 @@ ENTRY(_ex_single_step)
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;
@@ -191,12 +191,22 @@ ENTRY(_ex_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;
+ 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;
+
+1:
/*
* We were in an interrupt handler. By convention, all of them save
* SYSCFG with their first instruction, so by checking whether our
@@ -224,15 +234,11 @@ 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;
- jump _ex_trap_c;
-
+ /* Fall through to _bfin_return_from_exception. */
ENDPROC(_ex_single_step)
ENTRY(_bfin_return_from_exception)