[PATCH v4 15/16] powerpc/watchpoint/xmon: Don't allow breakpoint overwriting

[Ravi Bangoria]

Xmon allows overwriting breakpoints because it's supported by only
one dawr. But with multiple dawrs, overwriting becomes ambiguous
or unnecessary complicated. So let's not allow it.

Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.ibm.com>
Reviewed-by: Michael Neuling <mikey at neuling.org>
---
 arch/powerpc/xmon/xmon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index d8c0f01e4b24..99e9138661e4 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -1382,6 +1382,10 @@ bpt_cmds(void)
 			printf("Hardware data breakpoint not supported on this cpu\n");
 			break;
 		}
+		if (dabr.enabled) {
+			printf("Couldn't find free breakpoint register\n");
+			break;
+		}
 		mode = 7;
 		cmd = inchar();
 		if (cmd == 'r')
-- 
2.21.1