Handout

tools/qemu.mk

@@ -0,0 +1,111 @@
+# Targets for running and debugging in Qemu/KVM
+
+QEMUCPUS ?= 4
+INITRD ?= /dev/null
+
+# Switch to curses if no graphical output is available
+ifeq ($(DISPLAY),)
+	export QEMUDISPLAY    ?= curses
+else
+# Macos display
+	ifeq ($(shell uname),Darwin)
+		export QEMUDISPLAY    ?= cocoa
+	else
+		export QEMUDISPLAY    ?= gtk
+	endif
+endif
+
+export QEMUEXTRAFLAGS ?=
+
+# Architecture Specific flags
+QEMUFLAGS += -k en-us -machine pcspk-audiodev=pa -d guest_errors -m 2048
+# Macos sound
+ifeq ($(shell uname),Darwin)
+	QEMUFLAGS += -audiodev coreaudio,id=pa
+else
+	QEMUFLAGS += -audiodev pa,id=pa
+endif
+DBGKERNEL ?= $(KERNEL64)
+DBGARCH ?= i386:x86-64
+QEMU ?= qemu-system-x86_64
+QEMUKERNEL ?= -kernel $(KERNEL) -initrd $(INITRD)
+KVMFLAGS = -enable-kvm -cpu host
+QEMUDBGFLAGS = -no-shutdown -no-reboot
+
+GDB = $(PREFIX)gdb
+ifneq ($(XDG_RUNTIME_DIR),)
+	# We should prefer using domain sockets in a private directory
+	GDBPORT ?= $(XDG_RUNTIME_DIR)/stubs-gdb.sock
+else
+	# but fall back to PID + 1024, which should be an unprivileged unique port on single- and multiuser systems
+	GDBPORT ?= :$(shell echo $$(($$(id -u) + 1024)))
+endif
+ifneq ($(findstring /,$(GDBPORT)),)
+	QEMUGDB = -chardev socket,path=${GDBPORT},server=on,wait=off,id=gdb0 -gdb chardev:gdb0
+else
+	QEMUGDB = -gdb tcp:${GDBPORT}
+endif
+# (gdb itself supports either :port or a path as target)
+
+qemu: all
+	@echo "QEMU		${KERNEL}"
+	${VERBOSE} $(QEMU) $(QEMUKERNEL) $(QEMUGDB) -display ${QEMUDISPLAY} -smp $(QEMUCPUS) $(QEMUFLAGS) ${QEMUEXTRAFLAGS}
+
+# Runs StuBS in Qemu with with hardware accelerations (KVM support) enabled
+# The started emulator provides several virtual CPUs that execute in parallel.
+kvm: all
+	@echo "KVM		${KERNEL}"
+	${VERBOSE} ${QEMU}  $(QEMUKERNEL) $(QEMUGDB) -display ${QEMUDISPLAY} -smp $(QEMUCPUS) $(QEMUFLAGS) ${QEMUEXTRAFLAGS} $(KVMFLAGS)
+
+# Execute Qemu with activated GDB stub and directly connect GDB to the spawned Qemu.
+gdb: all
+	${VERBOSE} $(GDB) "$(DBGKERNEL)" \
+		-ex "set arch $(DBGARCH)" \
+		-ex "target remote | exec $(QEMU) -gdb stdio $(QEMUKERNEL) -smp $(QEMUCPUS) -S $(QEMUFLAGS) $(DBGFLAGS)"
+
+################################################################
+# Rekursive Targets: Setzen einzelner QEMU Paramter
+################################################################
+
+################################################################
+# Debugging mit GDB
+# Sinnvoll anwendbar mit den Targets: qemu, kvm, *-curses, *-serial
+%-gdb:
+	${VERBOSE} ${MAKE} QEMUEXTRAFLAGS="${QEMUEXTRAFLAGS} -S" $*
+
+# um sich mit GDB auf dem Standardport zu verbinden
+connect-gdb:
+	${VERBOSE} gdb -ex "target remote ${GDBPORT}" $(DBGKERNEL)
+
+################################################################
+# Eine -display Variante erzwingen
+%-curses:
+	${VERBOSE} ${MAKE} QEMUDISPLAY="curses" QEMUSERIAL="vc:80Cx24C" $*
+
+%-x11:
+	${VERBOSE} ${MAKE} QEMUDISPLAY=gtk $*
+
+################################################################
+# Serial-Ausgabe
+QEMUSERIAL ?= vc:80Cx24C
+QEMUFLAGS += -serial $(QEMUSERIAL)
+%-serial:
+	@echo "HINT: C-a x: Terminate QEMU; C-a c: Open QEMU console"
+	${VERBOSE} ${MAKE} QEMUSERIAL=mon:stdio $*
+
+# Help for Qemu targets
+help::
+	@$(echo) "System Emulation\n" \
+		"	\e[3mqemu\e[0m     Starts $(PROJECT) in QEMU\n" \
+		"	         Due to the internal design of QEMU, some things (especially\n" \
+		"	         race conditions) might behave different compared to hardware!\n\n" \
+		"	\e[3mkvm\e[0m      Starts $(PROJECT) in KVM, a hardware-accelerated virtual machine\n\n" \
+		"	\e[3m*-serial\e[0m Redirect the serial console to stdout (e.g., qemu-serial, kvm-serial)\n\n" \
+		"	\e[3m*-curses\e[0m   Use QEMU's curses interface (e.g., qemu-curses).\n"\
+		"	\e[3m*-x11\e[0m      Use QEMU's GTK interface (e.g., qemu-x11).\n\n"\
+		"	\e[3m*-gdb\e[0m    Start Simulator with internal GDB stub and wait for a GDB\n" \
+		"	         to attach. (e.g., qemu-gdb)\n" \
+		"	\e[3mconnect-gdb\e[0m    Connect to waiting GDB. Execute in a second terminal!\n\n"\
+
+# Phony targets
+.PHONY: qemu kvm help