vmrun: Expose bhyve's -G option

MFC after:	1 week

share/examples/bhyve/vmrun.sh

@@ -58,7 +58,7 @@ usage() {
 	    "[-d <disk file>]"
 	echo "                [-e <name=value>] [-f <path of firmware>]" \
 	    "[-F <size>]"
-	echo "                [-H <directory>]"
+	echo "                [-G [w][address:]port] [-H <directory>]"
 	echo "                [-I <location of installation iso>] [-l <loader>]"
 	echo "                [-L <VNC IP for UEFI framebuffer>]"
 	echo "                [-m <memsize>]" \
@@ -76,6 +76,7 @@ usage() {
 	echo "       -f: Use a specific UEFI firmware"
 	echo "       -F: Use a custom UEFI GOP framebuffer size" \
 	    "(default: ${DEFAULT_VNCSIZE})"
+	echo "       -G: bind the GDB stub to the specified address"
 	echo "       -H: host filesystem to export to the loader"
 	echo "       -i: force boot of the Installation CDROM image"
 	echo "       -I: Installation CDROM image location" \
@@ -132,7 +133,7 @@ vncport=${DEFAULT_VNCPORT}
 vncsize=${DEFAULT_VNCSIZE}
 tablet=""
 
-while getopts aAc:C:d:e:Ef:F:g:hH:iI:l:L:m:n:p:P:t:Tuvw c ; do
+while getopts aAc:C:d:e:Ef:F:G:hH:iI:l:L:m:n:p:P:t:Tuvw c ; do
 	case $c in
 	a)
 		bhyverun_opt="${bhyverun_opt} -a"
@@ -165,6 +166,9 @@ while getopts aAc:C:d:e:Ef:F:g:hH:iI:l:L:m:n:p:P:t:Tuvw c ; do
 	F)
 		vncsize="${OPTARG}"
 		;;
+	G)
+		bhyverun_opt="${bhyverun_opt} -G ${OPTARG}"
+		;;
 	H)
 		host_base=`realpath ${OPTARG}`
 		;;