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Message-Id: <20200414031659.58875-16-ravi.bangoria@linux.ibm.com>
Date: Tue, 14 Apr 2020 08:46:58 +0530
From: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To: mpe@...erman.id.au, mikey@...ling.org
Cc: apopple@...ux.ibm.com, paulus@...ba.org, npiggin@...il.com,
christophe.leroy@....fr, naveen.n.rao@...ux.vnet.ibm.com,
peterz@...radead.org, jolsa@...nel.org, oleg@...hat.com,
fweisbec@...il.com, mingo@...nel.org,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
ravi.bangoria@...ux.ibm.com
Subject: [PATCH v3 15/16] powerpc/watchpoint/xmon: Don't allow breakpoint overwriting
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@...ux.ibm.com>
---
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
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