From 6a330c2b26113258f560aa6b8b77e00c65da90b1 Mon Sep 17 00:00:00 2001
From: thegecko <rob.moran@arm.com>
Date: Sat, 17 Oct 2020 14:10:46 +0100
Subject: [PATCH] Add guard against decrementing port number

---
 src/pyocd-server.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pyocd-server.ts b/src/pyocd-server.ts
index 532f3f5..c645bc8 100644
--- a/src/pyocd-server.ts
+++ b/src/pyocd-server.ts
@@ -36,7 +36,7 @@ export class PyocdServer extends AbstractServer {
     protected progress = 0;
 
     public resolveGdbPort(port: number): number {
-        if (this.args.gdbCore) {
+        if (this.args.gdbCore && this.args.gdbCore > 0) {
             // PyOCD starts each core on a subsequent port
             // (e.g. core 0 on starting port, core 1 on starting port +1, etc.)
             port += this.args.gdbCore;